CN114464412B

CN114464412B - Dry-type transformer for power distribution system

Info

Publication number: CN114464412B
Application number: CN202210230588.4A
Authority: CN
Inventors: 曹光振
Original assignee: Jiangsu Dreiser Electric Co ltd
Current assignee: Jiangsu Dreiser Electric Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-11-29
Anticipated expiration: 2042-03-10
Also published as: CN114464412A

Abstract

The invention relates to the related technical field of power equipment and discloses a dry-type transformer for a power distribution system, which comprises a transformation winding, wherein a conductive rod is arranged on the transformation winding, an installation disc is fixedly arranged at the end part of the conductive rod, a protective box used for coating the transformation winding is movably arranged on the side wall of the conductive rod, a protective cavity is arranged in the inner cavity of the protective box, sleeve blocks are respectively and movably arranged at the upper end and the lower end of the protective box, and the middle part of each sleeve block is movably arranged with the conductive rod. According to the invention, the hot through pipe and the cold through pipe are arranged on the outer side of the protective box, so that in the heat dissipation process of the protective box, the heat dissipation length of the hot through pipe and the heat dissipation length of the cold through pipe are lengthened to increase the heat dissipation area, and the hot air density is smaller than the cold air density, so that hot air in the protective box flows back into the protective box from the cold through pipe after flowing through the hot through pipe for cooling, thereby realizing circulating cooling, and finally realizing the purposes of increasing the heat dissipation area and circularly cooling.

Description

Dry-type transformer for power distribution system

Technical Field

The invention relates to the technical field of power equipment, in particular to a dry-type transformer for a power distribution system.

Background

Dry-type transformers refer to transformers in which the iron core and the winding are not immersed in insulating oil, and are widely used in places such as local lighting, high-rise buildings, airports, dock mechanical equipment and the like.

The dry-type transformer is at the in-process that uses, because it mainly cools down through outside air current, therefore when the transformer heaies up, can make the air around the transformer rise, and the intensification of air current on every side can make transformer heat exchange's effect variation to make the difficult effluvium of going on of heat, cause transformer cooling efficiency poor.

On the other hand, the dry type transformer is mainly installed outdoors, etc., external dust is collected at the outside of the transformer, and a heavily-collected dust layer may cause a decrease in the intensity of heat dissipation of the transformer to the outside, thereby decreasing the heat dissipation efficiency of the transformer.

Disclosure of Invention

Aiming at the defects of the existing dry-type transformer in the use process in the background art, the invention provides the dry-type transformer for the power distribution system, which has the advantages of increasing the heat dissipation area and circularly cooling, and solves the technical problems in the background art.

The invention provides the following technical scheme: the utility model provides a dry-type transformer for distribution system, includes the vary voltage winding, be provided with the conducting rod on the vary voltage winding, and conducting rod tip fixed mounting has the mounting disc, the lateral wall movable mounting of conducting rod has the protective housing that is used for with the vary voltage winding cladding, and the inner chamber of protective housing is provided with the protection chamber, the upper and lower both ends difference movable mounting of protective housing has the collets, and the middle part and the conducting rod movable mounting of collets, the lateral wall of collets and the top fixed mounting that is located the vary voltage winding have hot siphunculus, the collets lateral wall is provided with cold siphunculus in the below that is located the vary voltage winding, and the inner chamber of hot siphunculus and cold siphunculus communicates with each other, realizes protecting the chamber and realizes circulating through hot siphunculus and cold siphunculus, hot siphunculus and cold siphunculus are the arc hollow tube, and all slope between hot siphunculus and the cold siphunculus and arrange the lateral wall at the collets.

Preferably, the air blocking piece is installed to the inner wall of hot siphunculus and cold siphunculus, and air blocking piece lateral wall fixed mounting have with protective housing lateral wall sliding connection's seal cover, the one end movable mounting of cold siphunculus has movable post, and the one end of activity post and the one end movable mounting of hot siphunculus, the lateral wall fixed mounting of activity post has the mount, and the lateral wall fixed mounting of mount has the cooling flabellum, the top fixed mounting of activity post has the defeated wind dish that flows to in the cold siphunculus fast in the hot siphunculus when being used for realizing cooling flabellum rotation.

Preferably, the inside of activity post is seted up with the communicating air inlet duct of hot siphunculus, and the bottom of activity post is seted up with the communicating cold air duct of cold siphunculus inner chamber, set up the cooling chamber in the inner wall of cooling flabellum, cooling chamber in the cooling flabellum carries out head and the tail in proper order and communicates with each other, and the head end in cooling chamber communicates with each other with the air inlet duct, the tail end in cooling chamber communicates with each other with the cold air duct.

Preferably, a driving block positioned on one side of the sealing sleeve is movably arranged on one side of the wind blocking block, a sealed expansion chamber is formed by the driving block through an inner cavity of the wind blocking block, the inner wall of the sealing sleeve and the side wall of the protective box, a guide post for transmission is fixedly arranged on one side of the driving block, the guide post and the wind blocking block are movably arranged, an air release groove is formed in the side wall of the wind blocking block, a liquid driving block is fixedly arranged at one end of the guide post, a sealed left cavity positioned on one side of the driving block is arranged on one side of the liquid driving block, a right cavity positioned on one side of the cooling fan blade is arranged on the other side of the liquid driving block, the left cavity and the right cavity are sealed in the wind blocking block, a liquid storage box positioned on the outer side of the cooling fan blade is fixedly arranged on one side of the wind blocking block, one side fixed mounting who drives the liquid piece is equipped with the reset spring who is arranged in the right cavity, and reset spring and the piece movable mounting that keeps out the wind, the inner wall top of the piece that keeps out the wind is offered and is used for communicating spillway with the right cavity, and the one end of spillway is located the top of cooling fan blade, the inner wall bottom of the piece that keeps out the wind offers with the communicating storage liquid way of left cavity, the one end of storage liquid way communicates with each other with the inner chamber of depositing the liquid case, fixed mounting has the check valve who is used for realizing the one-way circulation of liquid storage way right cavity in the piece that keeps out the wind, the inner wall bottom fixed mounting of depositing the liquid case is used for realizing depositing the check valve of one-way circulation in liquid case to the storage liquid way, and pours into appropriate amount coolant into in left cavity, right cavity and the liquid case.

Preferably, the cooling fan blades are obliquely arranged on the side wall of the fixed frame.

Preferably, the liquid storage tank is a cylinder with a sector cut, and an inner cavity for storing water is reserved in the inner cavity of the liquid storage tank.

Preferably, the sealing sleeve is made of wear-resistant and high-temperature-resistant rubber, and the sealing sleeve is shaped like a cuboid with a rectangular through groove in the middle.

The invention has the following beneficial effects:

1. according to the invention, the hot through pipe and the cold through pipe are arranged on the outer side of the protective box, so that in the heat dissipation process of the protective box, the heat dissipation length of the hot through pipe and the heat dissipation length of the cold through pipe are lengthened to increase the heat dissipation area, and the hot air density is smaller than the cold air density, so that hot air in the protective box flows back into the protective box from the cold through pipe after flowing through the hot through pipe for cooling, thereby realizing circulating cooling, and finally realizing the purposes of increasing the heat dissipation area and circularly cooling.

2. According to the invention, the wind blocking block is arranged, and the cooling fan blades are arranged between the hot through pipe and the cold through pipe, so that the wind blocking block can be blown by external wind power to realize sliding on the side wall of the protective box in the heat dissipation process, dust on the outer side wall of the protective box is cleaned through the sealing sleeve, and the wind blocking block swings along the wind, so that the cooling fan blades can rotate in the same direction after air flow in any wind direction passes through the wind blocking block, the cooling fan blades enable the air flow in the hot through pipe to be conveyed into the cold through pipe through the wind conveying disc, the circulating cooling strength is enhanced, and the purposes of cleaning along with the wind and enhancing the circulating cooling strength are finally realized.

3. The cooling fan blade is provided with the cooling cavity, so that air flow in the hot through pipe flows into the cold through pipe after passing through the inside of the cooling fan blade, the length of air flow cooling is further increased, and the cooling of hot air flow is facilitated.

Drawings

FIG. 1 is a schematic view of the overall external structure of the present invention;

FIG. 2 is a schematic view of the overall internal structure of the present invention;

FIG. 3 is a schematic view of the structure of the cooling chamber of the present invention.

In the figure: 1. a conductive rod; 2. sleeving blocks; 3. a protective box; 30. a protective cavity; 4. transforming winding; 5. mounting a disc; 6. cold pipe circulation; 7. a liquid storage channel; 8. a flooding block; 9. a return spring; 10. a one-way valve; 11. a liquid storage tank; 12. a movable post; 120. an air inlet duct; 13. a cold air duct; 14. cooling the fan blades; 140. a cooling chamber; 15. a fixed mount; 16. an air delivery plate; 17. an overflow channel; 18. a wind blocking block; 19. a guide post; 20. a gas release groove; 21. a drive block; 22. sealing sleeves; 23. a heat pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, a dry transformer for a power distribution system includes a transformer winding 4, a conductive rod 1 for connecting the transformer winding 4 up and down is disposed on the transformer winding 4, a mounting plate 5 for transmitting and fixing electric energy is fixedly mounted at an end of the conductive rod 1, a protective box 3 for covering the transformer winding 4 is movably mounted at a sidewall of the conductive rod 1, a protective cavity 30 is disposed in an inner cavity of the protective box 3, bushing blocks 2 are movably mounted at upper and lower ends of the protective box 3, respectively, a middle portion of the bushing block 2 is movably mounted with the conductive rod 1, the protective box 3 is limited outside the transformer winding 4 by the bushing block 2, so that only relative rotation between the protective box 3 and the transformer winding 4 is ensured, a heat-conducting pipe 23 is fixedly mounted at a sidewall of the bushing block 2 and above the transformer winding 4, and at the same time, the cold through pipe 6 is arranged on the side wall of the sleeve block 2 and below the variable voltage winding 4, the hot through pipe 23 is communicated with the inner cavity of the cold through pipe 6, the protection cavity 30 is circulated through the hot through pipe 23 and the cold through pipe 6, the hot through pipe 23 and the cold through pipe 6 are both arc-shaped hollow pipes, and the hot through pipe 23 and the cold through pipe 6 are obliquely arranged on the side wall of the sleeve block 2, so that the heat density of air in the protection cavity 30 is reduced after the obliquely upward arranged hot through pipe 23 is communicated with the inner cavity of the obliquely downward arranged cold through pipe 6, the air flows into the hot through pipe 23, and the cooling medium in the cold through pipe 6 flows back into the protection cavity 30 after the heat flow in the hot through pipe 23 is continuously increased, thereby ensuring that not only the heat is radiated outwards radiated by the side wall of the protection box 3, but also the hot through pipe 23 and the cold through pipe 6 extend outwards in the cooling process, thereby increasing the heat radiation area, the phenomenon that the heat dissipation efficiency is reduced due to large ambient heat caused by heat dissipation of the protective box 3 only through the outer side is avoided.

Referring to fig. 1 and 2, in order to prevent dust from gathering on the side wall of the protection box 3 and enhance the cooling efficiency of the air flow by the external air flow, a wind blocking block 18 is installed on the inner walls of the hot through pipe 23 and the cold through pipe 6, and the hot through pipe 23 and the cold through pipe 6 are fixed to each other by the wind blocking block 18, and at the same time, a sealing sleeve 22 slidably connected to the side wall of the protection box 3 is fixedly installed on the side wall of the wind blocking block 18, so that the phenomenon of scraping off the dust on the side wall of the protection box 3 by the sealing sleeve 22 can be achieved, on the other hand, a movable column 12 is movably installed at one end of the cold through pipe 6, and one end of the movable column 12 and one end of the hot through pipe 23 are movably installed, and a fixed frame 15 is fixedly installed on the side wall of the movable column 12, and a cooling fan blade 14 for blowing the air flow is fixedly installed on the side wall of the fixed frame 15, and a wind conveying plate 16 for rapidly flowing the air flow in the cold through pipe 6 when the cooling fan blade 14 rotates is fixedly installed at the top end of the movable column 12, so that the cooling fan blade 14 rotates, and the cooling fan blade 14 also rotates, thereby enhancing the cooling fan blade 23 and the cooling fan blade 14 rotates.

Referring to fig. 3, in order to increase the cooling time of the air flow for the cooling fan blade 14, an air inlet duct 120 communicating with the hot pipe 23 is disposed inside the movable column 12, a cold air duct 13 communicating with the inner cavity of the cold pipe 6 is disposed at the bottom of the movable column 12, and a cooling chamber 140 is disposed in the inner wall of the cooling fan blade 14, and is sequentially communicated end to end through the cooling chamber 140 in the cooling fan blade 14, and the head end of the cooling chamber 140 is communicated with the air inlet duct 120, and the tail end of the cooling chamber 140 is communicated with the cold air duct 13, so that it is ensured that, in the process of cooling, the hot air flow in the hot pipe 23 can sequentially flow through the air inlet duct 120, the cooling chamber 140, and the cold air duct 13 to the cold pipe 6, and the cooling time of the air flow is increased through the arrangement of the cooling chamber 140, and at the same time, the cooling chamber 140 disposed in the cooling fan blade 14 is more easily cooled in the process of rotating.

Referring to fig. 1 and 2, in order to achieve the effect of enhanced cooling under the windless condition, a driving block 21 located on one side of a sealing sleeve 22 is movably mounted on one side of a wind shielding block 18, the driving block 21 forms a sealed expansion chamber through an inner cavity of the wind shielding block 18, an inner wall of the sealing sleeve 22 and a side wall of a protective box 3, it is ensured that in the process of temperature increase in the protective box 3, the driving block 21 has a tendency of moving in the direction of a cooling fan blade 14 by means of air pressure enhancement in the expansion chamber, a guide column 19 for transmission is fixedly mounted on one side of the driving block 21, the guide column 19 is movably mounted with the wind shielding block 18, a gas release groove 20 for eliminating pressure in the expansion chamber on one side of the wind shielding block 21 is formed in the side wall of the wind shielding block 18, a liquid driving block 8 is fixedly mounted at one end of the guide column 19, a sealed left cavity located on one side of the driving block 21 is formed in the other side of the driving block 8, a right cavity located on one side of the cooling fan blade 14, a left cavity is fixedly mounted with a liquid storage block 18, a return spring 7 located in the inner cavity of the wind shielding block 18, a return spring 7 is mounted in the inner cavity 18, a return groove 17 for returning from the wind shielding block 18, a return spring 7 is mounted in the inner cavity 7 and a return groove for returning from the wind shielding block 18, meanwhile, a one-way valve 10 used for realizing unidirectional circulation of the liquid storage tank 11 in the liquid storage channel 7 is fixedly mounted at the bottom of the inner wall of the liquid storage tank 11, a proper amount of cooling medium is injected into the left chamber, the right chamber and the liquid storage tank 11, and the cooling medium is selected from water, so that external rainwater can be supplemented.

Referring to fig. 2, in order to realize that the cooling fan 14 is blown by wind and flows through the medium of the overflow channel 17, the wind rotates in the same direction as the medium impacts when flowing out, so that the cooling fan 14 is obliquely arranged on the side wall of the fixing frame 15, thereby ensuring that the medium impacts the cooling fan 14 and blows in the same direction as the external air flow, and realizing that the cooling fan 14 can only rotate in one direction.

Referring to fig. 1 and 2, in order to realize that the liquid storage tank 11 only rotates in one direction and simultaneously stores rainwater, the liquid storage tank 11 is a cylinder with a sector cut off, and an inner cavity for storing water is reserved in the inner cavity of the liquid storage tank 11, so that the sector part of the liquid storage tank is ensured to expose the cooling fan blades 14, and after the air flow of the wind blocking block 18 is guided, the cooling fan blades 14 can always rotate against the wind, and further the rotation direction of the cooling fan blades is ensured to be constant all the time, and meanwhile, in the process of ensuring medium impact in the overflow channel 17 through the arrangement of the liquid storage tank 11, the overflow channel 17 is arranged at the bottom of the inner cavity of the liquid storage tank 11, so that the phenomenon of outward scattering is avoided.

Referring to fig. 1 and 2, in order to enhance the sealing of the expansion chamber on one side of the driving block 21, the sealing sleeve 22 is made of wear-resistant and high-temperature-resistant rubber, and the sealing sleeve 22 is shaped as a rectangular cuboid with a rectangular through groove in the middle, so that the sealing sleeve 22 can be attached between the protective box 3 and the wind shielding block 18, dust can be removed, and the sealing of the expansion chamber can be ensured.

The working principle of the invention is as follows:

sufficient cooling medium can be put into the liquid storage tank 11, and the medium can be water, so that the device can be supplemented in real time when placed outside, the whole device is installed through the installation plate 5, and the transformer winding 4 is conducted through the conducting rod 1 to realize the working state;

in the process that the variable voltage winding 4 generates heat during working, hot air in the protective cavity 30 rises to the hot through pipe 23, and finally flows into the protective cavity 30 after passing through the air inlet duct 120, the cooling cavity 140, the cold air duct 13 and the cold through pipe 6, so that the air flow is automatically cooled, and meanwhile, part of the hot air flow radiates and dissipates heat outwards through the side wall of the protective box 3;

when airflow changes outside, for example, wind blows the wind blocking block 18, so that the wind blocking block 18 rotates on the side wall of the conductive rod 1 through the sleeve block 2, the wind blocking block 18 swings along with the airflow, and the sealing sleeve 22 is scraped on the outer side wall of the protective box 3 while swinging, so that dust on the outer side of the protective box 3 is cleaned;

on the other hand, after the air blocking block 18 swings downwind, the cooling fan blades 14 can rotate by the airflow, in the rotating process, the fixed frame 15 drives the movable column 12 and the air conveying disc 16 to synchronously rotate, the airflow in the hot through pipe 23 is rapidly input into the cooling cavity 140 from the air inlet duct 120 through the air conveying disc 16, the hot airflow is further cooled by the cooling cavity 140, and finally, the cooled airflow flows into the cold through pipe 6 through the cold air duct 13, so that the airflow in the protection cavity 30 is cooled;

when the ground has no air flow change, the air flow in the expansion cavity which is arranged in the inner cavity of the wind blocking block 18 and on the side wall of the protective box 3 is heated to expand, so that the air flow pushes the guide column 19, the liquid driving block 8 compresses the return spring 9, meanwhile, the cooling medium in the right cavity of the liquid driving block 8 flows into the liquid storage box 11 from the overflow channel 17 through the movement of the liquid driving block 8, and after the medium flows out from the overflow channel 17, the cooling medium acts on the cooling fan blades 14, the rotation of the cooling fan blades 14 is further enhanced while the cooling fan blades 14 are cooled, on the other hand, the pressure in the left cavity of the liquid driving block 8 is reduced through the movement of the liquid driving block 8 towards the direction of the overflow channel 17, and the medium in the liquid storage box 11 is opened through the one-way valve 10 communicated with the liquid storage box 11 through the liquid storage channel 7, at this time, the one-way valve 10 in the right chamber on the right side of the liquid storage channel 7 and the liquid driving block 8 is in a sealed state, finally, after the driving block 21 reaches the air release groove 20, the expanded air flow is rapidly discharged to the outside through the air release groove 20, under the action of the reset spring 9, the liquid driving block 8 can push the driving block 21 back, meanwhile, the one-way valve 10 between the liquid storage channel 7 and the liquid storage box 11 can be closed, the one-way valve 10 on the right chamber of the liquid storage channel 7 and the liquid driving block 8 can be opened, the medium in the left chamber can be returned through the liquid driving block 8 and flows to the right side of the liquid driving block 8 through the liquid storage channel 7 to the one-way valve 10, the medium cooling is realized by the next pushing, and then, after the air flow is heated and expanded again, the operation is repeated according to the above manner;

if the heat expansion occurs and the airflow changes, because the cooling fan blades 14 are obliquely arranged on the side wall of the fixed frame 15, the medium falling from the overflow channel 17 can enhance the cooling and rotation of the cooling fan blades 14, and therefore the medium flowing out from the overflow channel 17 and the external airflow flow cannot be influenced mutually.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A dry-type transformer for a power distribution system, comprising a transformer winding (4), characterized in that: the transformer winding is characterized in that a conductive rod (1) is arranged on the transformer winding (4), a mounting disc (5) is fixedly mounted at the end part of the conductive rod (1), a protective box (3) used for coating the transformer winding (4) is movably mounted on the side wall of the conductive rod (1), a protective cavity (30) is arranged in the inner cavity of the protective box (3), sleeve blocks (2) are movably mounted at the upper end and the lower end of the protective box (3) respectively, the middle part of each sleeve block (2) is movably mounted with the conductive rod (1), a hot through pipe (23) is fixedly mounted on the side wall of each sleeve block (2) and positioned above the transformer winding (4), a cold through pipe (6) is arranged on the side wall of each sleeve block (2) and positioned below the transformer winding (4), the hot through pipe (23) is communicated with the inner cavity of the cold through pipe (6), circulation of the hot through pipe (23) and the cold through pipe (6) in the protective cavity (30) is realized, the hot through pipe (23) and the cold through pipe (6) are arc-shaped, the side wall of the hot through pipe (23) and the cold through pipe (18) are connected with the protective box (18), the one end movable mounting of cold siphunculus (6) has movable post (12), and the one end of activity post (12) and the one end movable mounting of hot siphunculus (23), the lateral wall fixed mounting of activity post (12) has mount (15), and the lateral wall fixed mounting of mount (15) has cooling fan blade (14), the top fixed mounting of activity post (12) has air transmission dish (16) that air current flows fast to in cold siphunculus (6) in being used for realizing cooling fan blade (14) when rotating in hot siphunculus (23).

2. A dry-type transformer for an electrical distribution system as claimed in claim 1, wherein: air inlet duct (120) communicating with hot siphunculus (23) have been seted up to the inside of activity post (12), and the bottom of activity post (12) seted up with cold siphunculus (6) inner chamber communicating cold air duct (13), seted up cooling chamber (140) in the inner wall of cooling flabellum (14), cooling chamber (140) in cooling flabellum (14) carry out the head and the tail in proper order and communicate with each other, and the head end of cooling chamber (140) communicates with each other with air inlet duct (120), the tail end of cooling chamber (140) communicates with each other with cold air duct (13).

3. A dry-type transformer for a power distribution system as set forth in claim 2, wherein: one side of the wind blocking block (18) is movably provided with a driving block (21) positioned on one side of a sealing sleeve (22), the driving block (21) forms a sealed expansion chamber through an inner cavity of the wind blocking block (18), the inner wall of the sealing sleeve (22) and the side wall of the protection box (3), one side of the driving block (21) is fixedly provided with a guide column (19) for transmission, the guide column (19) and the wind blocking block (18) are movably arranged, the side wall of the wind blocking block (18) is provided with an air leakage groove (20), one end of the guide column (19) is fixedly provided with a liquid driving block (8), one side of the liquid driving block (8) is provided with a left cavity which is positioned on one side of the driving block (21) in a sealing manner, the other side of the liquid driving block (8) is provided with a right cavity which is positioned on one side of a cooling fan blade (14), the left cavity and the right cavity are positioned in the inner part of the wind blocking block (18) in a sealing manner, one side of the wind blocking block (18) is fixedly provided with a right cavity which is positioned on one side of the cooling fan blade (9), and a return spring (17) which is positioned above the movable overflow channel (17) and is positioned above the cooling spring (17), the utility model discloses a solar water heater, including the baffle piece, the inner wall bottom of baffle piece (18) is seted up with the communicating stock solution way of left cavity (7), the one end of stock solution way (7) communicates with each other with the inner chamber of depositing liquid case (11), fixed mounting has one-way valve (10) that are used for realizing stock solution way (7) one-way circulation of right cavity in baffle piece (18), the inner wall bottom fixed mounting of depositing liquid case (11) is used for realizing depositing liquid case (11) one-way valve (10) to one-way circulation in stock solution way (7), and injects suitable amount of coolant in left cavity, right cavity and the stock solution case (11).

4. A dry-type transformer for a power distribution system as set forth in claim 1, wherein: the cooling fan blades (14) are obliquely arranged on the side wall of the fixed frame (15).

5. A dry-type transformer for an electrical distribution system according to claim 3, wherein: the liquid storage box (11) is a cylinder after the sector is cut off, and an inner cavity for storing water is reserved in the inner cavity of the liquid storage box (11).

6. A dry-type transformer for a power distribution system as set forth in claim 1, wherein: the sealing sleeve (22) is made of wear-resistant and high-temperature-resistant rubber, and the sealing sleeve (22) is shaped as a cuboid with a rectangular through groove in the middle.