Maintenance-free intelligent respirator with oil cup for transformer

Abstract

The present invention discloses a maintenance-free intelligent respirator with an oil cup for a transformer, which relates to the technical field of transformers, and includes a first respirator, a second respirator and an electric control box. The tops of the first respirator and the second respirator are respectively connected to a main pipe connected to the oil pillow through a branch pipe. The first respirator and the second respirator both include an observer, a dryer and an air nozzle that are detachably connected from top to bottom. An oil cup is provided in the observer, a heating component is provided in the drying cylinder of the dryer, and a blowing component is provided between the electric control box and the observer. The present invention adopts a maintenance-free intelligent respirator with an oil cup for a transformer of the above structure, which can prevent the oil in the oil cup from contaminating the silica gel by setting the oil cup on the top of the dryer, and at the same time use the oil to play the role of insulation and filtering micro-water, and increase the dehumidification efficiency of the silica gel by setting a blowing component and a rotatable heating component.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a maintenance-free intelligent respirator with an oil cup for a transformer. Background Art

[0002] The transformer breather is an important component in the transformer equipment. Its main function is to maintain the oil volume inside the transformer within the normal range and ensure the stability of the oil volume. Specifically: 1. Allow the oil to expand and contract freely when the temperature and load change to maintain the stability of the oil volume; 2. Filter the air entering the transformer to prevent dust, moisture and other impurities from entering the oil and protect the quality of the oil; 3. Reduce the pressure inside the oil tank by discharging gas; 4. Maintain the sealing state of the oil tank through breathing circulation, reduce the entry of humid air, and prevent oil oxidation and aging.

[0003] The Chinese patent application number 201821900737.9 provides a transformer respirator, which includes a first respirator, a second respirator, a first dehydration component, a second dehydration component, a solar panel and a battery. The first respirator is connected to the transformer exhaust pipe by a first connecting pipe, and the second respirator is connected to the transformer exhaust pipe by a second connecting pipe. The first dehydration component is arranged in the first respirator, and the first dehydration component is used to dehydrate the silica gel in the first respirator. The second dehydration component is arranged in the second respirator, and the second dehydration component is used to dehydrate the silica gel in the second respirator. The first dehydration component and the second dehydration component are both electrically connected to the battery, and the battery is electrically connected to the solar panel. The first dehydration component includes a first heating element and a first blowing element. The first heating element includes a first heating wire, which is spirally coiled on the inner wall of the first respirator. The first blowing element includes a first fan. The first respirator includes a first silicone container and a first oil cup. The first silicone container is used to hold silicone. A mesh is provided on the bottom surface of the first silicone container. The first fan is installed at the bottom of the first silicone container. The first oil cup is installed at the bottom of the first fan. The first oil cup is connected to the first silicone container.

[0004] Although the above results have improved the technical problems of the prior art that the replacement of silica gel is cumbersome, easy to waste resources and has potential safety hazards, there are the following problems when using it: 1. The oil cup is below the silica gel container and the fan. When inhaling, the gas first passes through the oil cup. If the breathing volume is large, the oil in the oil cup may enter the silica gel container and cause silica gel contamination. 2. The electric heating wire is spirally coiled on the inner wall of the respirator, and the contact area with the silica gel is small, which is not conducive to the rapid dehumidification of the silica gel.

[0005] In order to solve the above problems, it is necessary to provide a new type of transformer respirator. Summary of the invention

[0006] The purpose of the present invention is to provide a maintenance-free intelligent respirator with an oil cup for a transformer. The oil cup is arranged on the top of a dryer to prevent the oil in the oil cup from contaminating the silica gel. At the same time, the oil is used for insulation and filtering of micro-water. The dehumidification efficiency of the silica gel is increased by arranging a blowing component and a rotatable heating component.

[0007] To achieve the above-mentioned purpose, the present invention provides a maintenance-free intelligent breather with an oil cup for a transformer, comprising a first breather, a second breather and an electric control box, the top ends of the first breather and the second breather are respectively connected to a main pipe connected to the oil pillow through a branch pipe, the first breather and the second breather both comprise an observer, a dryer and an air nozzle which are detachably connected from top to bottom, an oil cup is arranged in the observer, a heating assembly is arranged in the drying cylinder of the dryer, and a blowing assembly is arranged between the electric control box and the observer.

[0008] Preferably, the observer comprises a top cover, an outer cup and the oil cup located in the outer cup, the top of the outer cup is threadedly sealed with the top cover, the side wall of the outer cup and the oil cup are made of transparent material, and a mounting groove and a first sealing ring and a second sealing ring are arranged with the mounting groove as the center at the bottom surface of the bottom plate of the outer cup;

[0009] Two support columns are provided on the top surface of the bottom plate of the outer cup, and the core of the support column is provided with an air duct connected to the drying cylinder, a boss is provided on the outer wall of the support column, and bumps are provided on both sides of the oil cup, and a connecting hole is provided on the bumps, and the diameter of the connecting hole is larger than the outer diameter of the support column and smaller than the diameter of the boss. An air pipe is integrally connected to the top cover, and the bottom end of the air pipe extends into the oil cup, and the top end of the air pipe is connected to the branch pipe, and the oil height in the oil cup is higher than the bottom end height of the air pipe.

[0010] Preferably, the blowing assembly includes a fan and an integrated pipe, the fan is located in the electrical control box, one end of the integrated pipe is fixed to the electrical control box, and the other end of the integrated pipe is fixed to the top cover of the observer, and an air duct is provided in the integrated pipe, one end of the air duct is arranged corresponding to the fan, and the other end of the air duct is connected to the outer cup of the observer.

[0011] Preferably, the heating assembly includes a motor, a rotating shaft, a heating plate and a humidity sensor, the motor is fixed in the mounting groove, the humidity sensor is fixed on one side of the motor, the rotating shaft includes an L-shaped steering rod integrally connected up and down and a vertically arranged mounting rod, the bottom end of the mounting rod extends to the bottom surface of the drying cylinder, the heating plates are evenly distributed on the mounting rod, and the humidity sensor, the heating plate and the wiring on the motor are connected to the electric control box in sequence through the air duct and the integrated pipeline.

[0012] Preferably, the dryer includes a transparent shell and the drying cylinder located in the transparent shell, the top surfaces of the transparent shell and the drying cylinder are open, the top edge of the transparent shell is in close contact with the first sealing ring, and the top edge of the drying cylinder is in close contact with the second sealing ring, the bottom surface of the transparent shell is provided with a limiting groove and an air hole located outside the limiting groove, the limiting groove is adapted to the structure of the drying cylinder, the air hole is connected with the air nozzle, the side wall of the drying cylinder is provided with evenly distributed through holes, the bottom surface of the drying cylinder is a sealing surface, and the drying cylinder is filled with silica gel.

[0013] Preferably, a first fixing ring is provided on the side wall of the top cover of the observer, a second fixing ring is connected to the top of the side wall of the dryer, the first fixing ring, the second fixing ring and the mounting plate are fixedly connected by a connecting assembly, connecting plates are provided on both sides of the electric control box, and elongated connecting holes are provided on the connecting plates, the elongated connecting holes are adapted to the threaded connecting column structure located on the first fixing ring, and a fixing nut is provided on the threaded connecting column.

[0014] Preferably, four connecting assemblies are provided, which are respectively located on both sides of the first respirator and the second respirator. The connecting assembly includes a long bolt and a first nut, a second nut, and a third nut located on the long bolt. The long bolt passes through the connecting ear on the second fixing ring, the connecting ear on the first fixing ring and the mounting plate from bottom to top. The first nut is located above the mounting plate, the second nut is located below the first fixing ring, and the third nut is located below the second fixing ring.

[0015] Preferably, the top end of the air nozzle is threadedly sealed to the bottom end of the side wall of the transparent shell, and a filter is provided inside the air nozzle.

[0016] Preferably, the side wall of the outer cup, the oil cup and the transparent shell are all made of glass.

[0017] Preferably, an oil level marking line is provided on the side wall of the oil cup.

[0018] Therefore, the present invention adopts the maintenance-free intelligent respirator with oil cup for transformer with the above structure, which has the following beneficial effects:

[0019] 1. The oil cup is placed on the top of the dryer to prevent the oil in the oil cup from contaminating the silica gel. At the same time, the oil is used to insulate and filter micro-water.

[0020] 2. The blowing assembly can be provided to cause the airflow to pass through the outer cup of the observer, the air duct, the transparent shell of the dryer, the drying cylinder of the dryer, the air hole and the air nozzle in sequence, and the airflow is used to dehumidify the silica gel. In addition, the blowing assembly can take away the heat generated by the operation of various electrical components in the control box, thereby achieving a cooling effect on the control box. At the same time, the airflow with heat can improve the dehumidification effect on the silica gel;

[0021] 3. The heating element can be used to rotate the heating plate, thereby increasing the contact area between the heating plate and the silica gel and increasing the dehumidification efficiency of the silica gel.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a maintenance-free intelligent respirator with an oil cup for a transformer of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of a first respirator in a maintenance-free intelligent respirator with an oil cup for a transformer of the present invention;

[0025] Figure 3 It is a structural schematic diagram of an embodiment of a heating component in a maintenance-free intelligent respirator with an oil cup for a transformer of the present invention;

[0026] Figure 4 A top view of an embodiment of a support column in a maintenance-free intelligent respirator with an oil cup for a transformer of the present invention;

[0027] Figure 5 It is a schematic diagram of an embodiment of an observer in a maintenance-free intelligent respirator with an oil cup for a transformer according to the present invention.

[0028] Reference numerals

[0029] 1. First respirator; 2. Second respirator; 3. Electric control box; 4. Branch pipe; 5. Main pipe; 6. Observer; 61. Top cover; 62. Outer cup; 63. Oil cup; 64. Support column; 7. Dryer; 71. Transparent shell; 72. Drying cylinder; 73. Through hole; 8. Air nozzle; 9. Heating assembly; 91. Motor; 92. Rotating shaft; 93. Heating plate; 94. Humidity sensor; 10. Integrated pipeline; 11. First sealing ring; 12. Second sealing ring; 13. Airway; 14. Boss; 15. First fixing ring; 16. Second fixing ring; 17. Mounting plate; 18. Long bolt; 19. First nut; 20. Second nut; 21. Third nut; 22. Connecting plate; 23. Fixing nut; 24. Air pipe; 25. Sealing pad; 26. External thread; 27. Internal thread. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0031] Example

[0032] like Figure 1-4 As shown, a maintenance-free intelligent respirator with an oil cup for a transformer includes a first respirator 1, a second respirator 2 and an electric control box 3. The tops of the first respirator 1 and the second respirator 2 are respectively connected to a main pipe 5 connected to the oil pillow through a branch pipe 4. The first respirator 1 and the second respirator 2 each include an observer 6, a dryer 7 and an air nozzle 8 that are detachably connected from top to bottom. An oil cup 63 is provided in the observer 6, a heating component 9 is provided in the drying cylinder 72 of the dryer 7, and a blowing component is provided between the electric control box 3 and the observer 6.

[0033] The observer 6 includes a top cover 61, an outer cup 62 and an oil cup 63 located in the outer cup 62. The top of the outer cup 62 is threadedly sealed with the top cover 61. The threaded sealing connection facilitates the removal of the outer cup 62 from the top cover 61. The specific method of the threaded sealing connection can be that the top of the outer wall of the outer cup 62 is provided with an outer thread 26, the bottom of the inner wall of the top cover 61 is provided with an inner thread 27 matching the outer thread 26, and the inner wall of the top plate of the top cover 61 is provided with a sealing gasket 25 corresponding to the top edge of the outer cup 62. The side wall of the outer cup 62 and the oil cup 63 are made of transparent material, and the transparent material can be glass. The bottom surface center of the bottom plate of the outer cup 62 is provided with a mounting groove and a first sealing ring 11 and a second sealing ring 12 arranged with the mounting groove as the center.

[0034] Two support columns 64 are provided on the top surface of the bottom plate of the outer cup 62, and the core of the support column 64 is provided with an air passage 13 connected to the drying cylinder 72. A boss 14 is provided on the outer wall of the support column 64, and bumps are provided on both sides of the oil cup 63. The bumps are provided with connecting holes. The diameter of the connecting hole is larger than the outer diameter of the support column 64 and smaller than the diameter of the boss 14. After the connecting hole is sleeved on the support column 64, the boss 14 can support the bumps, thereby fixing the oil cup 63. The top cover 61 is integrally connected with an air pipe 24, the bottom end of the air pipe 24 extends into the oil cup 63, and the top end of the air pipe 24 is connected to the branch pipe 4. The oil in the oil cup 63 is higher than the bottom end of the air pipe 24, and the oil can block the air in the oil cup 63 from the air in the branch pipe 4. An oil level marking line is provided on the side wall of the oil cup 63. The oil level marking line can facilitate observers to judge whether the respirator is in the exhalation state or the inhalation state.

[0035] The dryer 7 includes a transparent shell 71 and a drying cylinder 72 located in the transparent shell 71. The top surfaces of the transparent shell 71 and the drying cylinder 72 are both open, and the material of the transparent shell 71 is glass. The top edge of the transparent shell 71 is in close contact with the first sealing ring 11, and the top edge of the drying cylinder 72 is in close contact with the second sealing ring 12. The bottom surface of the transparent shell 71 is provided with a limit groove and an air hole located outside the limit groove. The limit groove is adapted to the structure of the drying cylinder 72, and the air hole is connected with the air nozzle 8. The side wall of the drying cylinder 72 is provided with evenly distributed through holes 73, the bottom surface of the drying cylinder 72 is a sealing surface, and the drying cylinder 72 is filled with silica gel. The top of the air nozzle 8 is threadedly sealed with the bottom end of the side wall of the transparent shell 71, and a filter is provided in the air nozzle 8. The filter can effectively prevent mosquitoes from entering the first respirator 1 or the second respirator 2 and affecting the smooth flow of air.

[0036] A first fixing ring 15 is provided on the side wall of the top cover 61 of the observer 6, and a second fixing ring 16 is connected to the top of the side wall of the dryer 7. The first fixing ring 15, the second fixing ring 16 and the mounting plate 17 are fixedly connected by a connecting assembly. There are four connecting assemblies, which are respectively located on both sides of the first respirator 1 and the second respirator 2. The connecting assembly includes a long bolt 18 and a first nut 19, a second nut 20 and a third nut 21 located on the long bolt 18. The long bolt 18 passes through the connecting ear on the second fixing ring 16, the connecting ear on the first fixing ring 15 and the mounting plate 17 from bottom to top. The first nut 19 is located above the mounting plate 17, the second nut 20 is located below the first fixing ring 15, and the third nut 21 is located below the second fixing ring 16. When in use, the third nut 21 is used to tighten the second fixing ring 16 so that the top edge of the transparent housing 71 is in close contact with the first sealing ring 11, and the top edge of the drying cylinder 72 is in close contact with the second sealing ring 12. The first nut 19 and the second nut 20 are used in combination to achieve a fixed connection between the mounting plate 17 and the first fixing ring 15. Connecting plates 22 are provided on both sides of the electric control box 3, and long strip connecting holes are provided on the connecting plates 22. The long strip connecting holes are adapted to the threaded connecting column structure on the first fixing ring 15, and the threaded connecting column is provided with a fixing nut 23. The threaded connecting column and the long strip connecting hole are used in combination to achieve the fixation of the electric control box 3 and the first fixing ring 15, thereby achieving the fixed installation of the electric control box 3.

[0037] The blowing assembly includes a fan and an integrated pipe 10. The fan is located in the electric control box 3. One end of the integrated pipe 10 is fixed to the electric control box 3, and the other end of the integrated pipe 10 is fixed to the top cover 61 of the observer 6. An air duct is arranged in the integrated pipe 10. One end of the air duct is arranged corresponding to the fan, and the other end of the air duct is connected to the outer cup 62 of the observer 6. When in use, the fan can suck the outside air into the electric control box 3, and then blow the air with heat in the electric control box 3 due to the operation of various components into the outer cup 62 of the observer 6 through the air duct, and then enter the drying cylinder 72 of the dryer 7 through the air channel 13 on the support column 64, and then enter the transparent shell 71 through the through hole 73, and then enter the air nozzle 8 through the air hole, and finally diffuse into the outside air to achieve the dehumidification of the silica gel in the drying cylinder 72.

[0038] The heating assembly 9 includes a motor 91, a rotating shaft 92, a heating plate 93 and a humidity sensor 94. The motor 91 is fixed in the mounting groove, the humidity sensor 94 is fixed on one side of the motor 91, the rotating shaft 92 includes an L-shaped steering rod connected in an integral manner from top to bottom and a vertically arranged mounting rod, the bottom end of the mounting rod extends to the bottom surface of the drying cylinder 72, the heating plates 93 are evenly distributed on the mounting rod, and the wiring on the humidity sensor 94, the heating plate 93 and the motor 91 are connected to the electric control box 3 in sequence through the airway 13 and the integrated pipeline 10. When in use, the motor 91 drives the rotating shaft 92 to rotate, so that the heating plate 93 rotates in the drying cylinder 72, so as to stir the silica gel, increase the contact area with the silica gel, and thus improve the dehumidification efficiency of the silica gel.

[0039] When in use, valves can be set on the two branch pipes 4. When the respirator is allocated to a large transformer, both valves can be opened to allow the first respirator 1 and the second respirator 2 to work simultaneously. When the respirator is allocated to a small transformer, the first respirator 1 and the second respirator 2 can be made to work alternately to ensure that the respirator can always filter the air entering the transformer, prevent dust, moisture and other impurities from entering the oil, and protect the quality of the oil. The first respirator 1 and the second respirator 2 have the same structure and the same working principle. The working process of the first respirator 1 is described as follows: When the oil in the transformer oil tank expands due to heat, the oil level in the oil pillow rises accordingly, and the respirator exhales. When exhaling, the gas in the oil pillow enters the air pipe 24 through the main pipe 5 and the branch pipe 4. The gas in the air pipe 24 presses down the oil in the air pipe 24 to raise the oil level in the oil cup 63. At the same time, the gas enters the outer cup 62 of the observer 6 through the oil in the form of bubbles. Then the gas in the outer cup 62 enters the drying cylinder 72 of the dryer 7 through the air passage 13 on the support column 64, and then passes through the through hole 7 3 enters the transparent shell 71, then enters the air nozzle 8 through the air hole, and finally diffuses into the outside air; when the oil in the transformer oil tank is cooled and shrinks, the oil level in the oil pillow decreases accordingly, and the respirator inhales. When inhaling, the outside air enters the transparent shell 71 of the dryer 7 through the air nozzle 8 and the air hole, then enters the drying cylinder 72 through the through hole 73, and then enters the outer cup 62 of the observer 6 through the air duct 13. The air pressure in the outer cup 62 increases, which reduces the liquid level in the oil cup 63. At the same time, the excess gas in the outer cup 62 enters the air pipe 24 in the form of bubbles, and finally enters the oil pillow through the branch pipe 4 and the main pipe 5. When the humidity sensor 94 detects that the humidity in the drying cylinder 72 reaches the set value, it transmits the signal to the controller in the control box, and the controller controls the fan, the motor 91 and the heating plate 93 to start, so that the blowing component blows the silica gel in the drying cylinder 72, and the heating component 9 heats the silica gel, thereby achieving efficient dehumidification of the silica gel.

[0040] Therefore, the present invention adopts the maintenance-free intelligent respirator with oil cup for transformer of the above structure, which can prevent the oil in the oil cup from contaminating the silica gel by setting the oil cup on the top of the dryer, and use the oil to play the role of insulation and filtering micro-water; it can cause the air flow to pass through the outer cup of the observer, the air duct, the transparent shell of the dryer, the drying cylinder, the air holes and the air nozzle of the dryer in sequence by setting a blowing component, and use the air flow to dehumidify the silica gel. In addition, the blowing component can take away the heat generated by the operation of each electrical component in the control box, thereby achieving a cooling effect on the control box, and the air flow with heat can improve the dehumidification effect on the silica gel; the heating plate can be rotated by the heating component, thereby increasing the contact area between the heating plate and the silica gel, and increasing the dehumidification efficiency of the silica gel.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A maintenance-free intelligent respirator with oil cup for transformer, characterized in that: It includes a first respirator, a second respirator and an electric control box. The tops of the first respirator and the second respirator are respectively connected to a main pipe connected to the oil conservator through a branch pipe. The first respirator and the second respirator each include an observer, a dryer and an air nozzle which are detachably connected from top to bottom. An oil cup is provided in the observer. A heating component is provided in the drying cylinder of the dryer. A blowing component is provided between the electric control box and the observer. The observer comprises a top cover, an outer cup and the oil cup located in the outer cup, the top of the outer cup is threadedly sealed with the top cover, the side wall of the outer cup and the oil cup are made of transparent material, and a mounting groove and a first sealing ring and a second sealing ring are arranged at the center of the bottom surface of the bottom plate of the outer cup with the mounting groove as the center; Two support columns are provided on the top surface of the bottom plate of the outer cup, the core of the support column is provided with an air passage connected to the drying cylinder, a boss is provided on the outer wall of the support column, and bumps are provided on both sides of the oil cup, and a connecting hole is provided on the bump, the diameter of the connecting hole is larger than the outer diameter of the support column and smaller than the diameter of the boss, an air pipe is integrally connected to the top cover, the bottom end of the air pipe extends into the oil cup, the top end of the air pipe is connected to the branch pipe, and the oil height in the oil cup is higher than the bottom end height of the air pipe; The blowing assembly includes a fan and an integrated pipe, the fan is located in the electric control box, one end of the integrated pipe is fixed to the electric control box, and the other end of the integrated pipe is fixed to the top cover of the observer, and an air duct is arranged in the integrated pipe, one end of the air duct is arranged corresponding to the fan, and the other end of the air duct is connected to the outer cup of the observer.

2. The maintenance-free intelligent respirator with oil cup for transformer according to claim 1 is characterized in that: The heating assembly includes a motor, a rotating shaft, a heating plate and a humidity sensor. The motor is fixed in the mounting groove, the humidity sensor is fixed on one side of the motor, the rotating shaft includes an L-shaped steering rod integrally connected up and down and a vertically arranged mounting rod, the bottom end of the mounting rod extends to the bottom surface of the drying cylinder, the heating plates are evenly distributed on the mounting rod, and the humidity sensor, the heating plate and the wiring on the motor are connected to the electric control box in sequence through the air duct and the integrated pipeline.

3. The maintenance-free intelligent respirator with oil cup for transformer according to claim 2 is characterized in that: The dryer includes a transparent shell and the drying cylinder located in the transparent shell, the top surfaces of the transparent shell and the drying cylinder are both open, the top edge of the transparent shell is in close contact with the first sealing ring, and the top edge of the drying cylinder is in close contact with the second sealing ring. The bottom surface of the transparent shell is provided with a limiting groove and an air hole located outside the limiting groove, the limiting groove is adapted to the structure of the drying cylinder, the air hole is connected with the air nozzle, the side wall of the drying cylinder is provided with evenly distributed through holes, the bottom surface of the drying cylinder is a sealing surface, and the drying cylinder is filled with silica gel.

4. The maintenance-free intelligent respirator with oil cup for transformer according to claim 3 is characterized in that: A first fixing ring is provided on the side wall of the top cover of the observer, and a second fixing ring is connected to the top of the side wall of the dryer. The first fixing ring, the second fixing ring and the mounting plate are fixedly connected by a connecting assembly. Connecting plates are provided on both sides of the electric control box, and elongated connecting holes are provided on the connecting plates. The elongated connecting holes are adapted to the threaded connecting column structure located on the first fixing ring, and a fixing nut is provided on the threaded connecting column.

5. The maintenance-free intelligent respirator with oil cup for transformer according to claim 4 is characterized in that: There are four connecting components, which are respectively located on both sides of the first respirator and the second respirator. The connecting components include a long bolt and a first nut, a second nut, and a third nut located on the long bolt. The long bolt passes through the connecting ear on the second fixing ring, the connecting ear on the first fixing ring and the mounting plate from bottom to top. The first nut is located above the mounting plate, the second nut is located below the first fixing ring, and the third nut is located below the second fixing ring.

6. The maintenance-free intelligent respirator with oil cup for transformer according to claim 5 is characterized in that: The top end of the air nozzle is threadedly sealed with the bottom end of the side wall of the transparent shell, and a filter is arranged inside the air nozzle.

7. The maintenance-free intelligent respirator with oil cup for transformer according to claim 6 is characterized in that: The side wall of the outer cup, the oil cup and the transparent shell are all made of glass.

8. The maintenance-free intelligent respirator with oil cup for transformer according to claim 7 is characterized in that: An oil level marking line is arranged on the side wall of the oil cup.

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