Oil conservator for transformer

Abstract

The oil conservator comprises an oil conservator box, a vertical partition plate is arranged in the oil conservator box, an inner cavity of the oil conservator box comprises an air bag cavity and an oil cavity which are located on the two sides of the vertical partition plate, a main air bag is arranged in the air bag cavity, and an air vent of the main air bag is connected with an air pipe; the breather pipe extends out of the oil conservator box; an adjusting cylinder is arranged on the side, facing the oil cavity, of the vertical partition plate and located above the liquid level of the oil liquid. The adjusting cylinder is communicated with the airbag cavity and the oil cavity, an auxiliary airbag is arranged in the adjusting cylinder and is a long cylinder piece with one end open, a cylinder opening of the auxiliary airbag is circumferentially connected to the end, close to the airbag cavity, of the adjusting cylinder in a sealed mode, and the end, away from the cylinder opening, of the auxiliary airbag is located in the adjusting cylinder and extends towards the oil cavity. Through the arrangement of the double air bags, only the main air bag is communicated with the outside, water vapor is prevented from entering, insulating oil is not prone to being affected with damp, air tightness is good, the insulating oil is not prone to making contact with outside air, the insulating oil is not prone to aging, and the service life of the insulating oil is prolonged.

Description

Technical Field

[0001] The present application relates to the field of transformers, and in particular to an oil pillow for a transformer. Background Art

[0002] The transformer oil pillow is usually located above the transformer, and uses its own weight to continuously supply oil. There is an air bag in the oil pillow, and the gas in the air bag is connected to the atmosphere through a breathing tube and a desiccant. The bottom of the air bag is close to the oil surface of the oil storage cabinet. When the oil level changes, the air bag will also expand or compress. However, the humid air in the atmosphere will inevitably enter the transformer oil, causing the transformer oil to age and the insulation strength to decrease.

[0003] In the related art, the oil pillow is generally a horizontal cylindrical shape, in which the cooling oil only occupies about one-third of the volume of the inner cavity of the oil pillow body. The surface area of ​​the cooling oil is large, and the area of ​​contact between the cooling oil and the air is large. Therefore, the insulating oil oxidizes and deteriorates faster. In addition, during each breathing process of the respirator, the amount of air entering and exiting is large, which accelerates the moisture and aging of the insulating oil. Utility Model Content

[0004] In order to reduce the moisture absorption and aging speed of insulating oil, the present application provides an oil pillow for a transformer.

[0005] The present application provides an oil pillow for a transformer, which adopts the following technical solution:

[0006] An oil pillow for a transformer comprises an oil pillow box, wherein a vertical partition is arranged in the oil pillow box, wherein the inner cavity of the oil pillow box comprises an air bag cavity and an oil cavity located on both sides of the vertical partition, wherein a main air bag is arranged in the air bag cavity, and the vent of the main air bag is connected with a vent pipe; wherein the vent pipe extends to the outside of the oil pillow box; wherein an adjusting cylinder is arranged on the side of the vertical partition facing the oil cavity, and wherein the adjusting cylinder is located above the liquid surface of the oil; wherein the adjusting cylinder connects the air bag cavity and the oil cavity, wherein an auxiliary air bag is arranged in the adjusting cylinder, and wherein the auxiliary air bag is a long cylinder with an opening at one end, wherein the cylinder mouth of the auxiliary air bag is circumferentially sealed and connected to the end of the adjusting cylinder close to the air bag cavity, wherein the end of the auxiliary air bag away from the cylinder mouth is in the adjusting cylinder, and the end of the auxiliary air bag away from the adjusting cylinder extends toward the oil cavity.

[0007] By adopting the above technical solution, the insulating oil is located in the oil cavity, and the air above the insulating oil is partially filled with nitrogen to reduce the oxidation of the insulating oil. When the oil expands and contracts due to heat and cold, it slides in the regulating tube through the auxiliary airbag at the closed end of the regulating tube, so that the insulating oil hardly contacts the auxiliary airbag, and the auxiliary airbag is not easy to be oxidized and cracked by heat; at the same time, after the auxiliary airbag slides in the regulating tube, the size of the main airbag changes to adjust the pressure in the airbag cavity. Through the setting of the main airbag and the auxiliary airbag, the double airbag is connected to the outside world only, preventing the entry of water vapor, making the insulating oil not easy to be damp; and the airtightness is good, the insulating oil is not easy to contact the outside air, making the insulating oil not easy to age, and extending the service life of the insulating oil.

[0008] Optionally, the inner wall of the adjusting cylinder is slidably connected with a piston plate, a through hole is opened on the piston plate, the end circumferential outer wall of the auxiliary airbag away from the airbag cavity is fixed to the inner wall of the through hole, and the sliding direction of the piston plate extends along the length direction of the adjusting cylinder.

[0009] By adopting the above technical solution, the piston plate enables the end of the auxiliary airbag away from the airbag cavity to slide stably.

[0010] Optionally, a first sealing ring is provided on the piston plate, and the first sealing ring seals and connects the piston plate and the regulating cylinder.

[0011] By adopting the above technical solution, when the insulating oil level is higher than the regulating cylinder, the oil only contacts the end of the auxiliary airbag away from the airbag cavity. Since the auxiliary airbag is a long cylindrical piece with an opening at one end, the contact area is small, thereby preventing the entry of water vapor, making the insulating oil less susceptible to moisture and extending the service life of the insulating oil.

[0012] Optionally, a sliding groove for the piston plate to slide is provided on the inner wall of the adjusting cylinder.

[0013] By adopting the above technical solution, the sliding stability of the piston plate is further improved, the piston plate is not easy to deviate, and the sealing effect is good.

[0014] Optionally, the tube mouth of the auxiliary airbag is sealed and connected to the end of the adjusting tube close to the airbag cavity through a threaded sleeve, a threaded groove is provided on the inner wall of the threaded sleeve, a vertical partition protrudes from the end of the adjusting tube toward the airbag cavity, and the threaded sleeve is threadedly connected to the outer wall of the end of the adjusting tube protruding toward the airbag cavity through the threaded groove, the tube mouth of the auxiliary airbag is sealed and pressed between the end of the adjusting tube and the inner wall of the threaded sleeve, and a connecting port is provided at the end of the threaded sleeve away from the adjusting tube.

[0015] By adopting the above technical solution, after the threaded sleeve is tightened, the auxiliary airbag tube mouth is sealed and pressed against the end of the adjustment tube, so that the auxiliary airbag is easy to install and has a good sealing effect.

[0016] Optionally, a second sealing ring is fixed to the inner wall of the threaded sleeve, and the second sealing ring is pressed against the end surface of the adjusting tube to clamp the tube mouth of the auxiliary airbag.

[0017] By adopting the above technical solution, the second sealing ring further improves the sealing performance of the tube mouth and the regulating tube of the auxiliary airbag, making it difficult to leak.

[0018] Optionally, the ventilation pipe is connected to a respirator, and the respirator is filled with silica gel particles.

[0019] By adopting the above technical solution, the provision of the respirator and the silica gel layer reduces the moisture in the gas entering the main airbag, thereby making the insulating oil less susceptible to moisture.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. The double airbags in the present application solution are arranged so that only the main airbag is connected to the outside world, thereby preventing the entry of water vapor, making the insulating oil less susceptible to moisture, and having good air tightness, so that the insulating oil is not easily exposed to the outside air, making the insulating oil less susceptible to aging, and extending the service life of the insulating oil;

[0022] 2. The piston plate and the first sealing ring are arranged so that even if the oil contacts the auxiliary airbag, since the auxiliary airbag is a long cylinder with one end open, the oil can only contact the end of the long cylinder, and the contact area is small, so that the air is not easy to affect the oil;

[0023] 3. The second sealing ring is provided to ensure the tightness of the tube mouth of the auxiliary airbag and the regulating tube, making it difficult to leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an oil pillow for a transformer according to an embodiment of the present application.

[0025] Figure 2 yes Figure 1 A magnified view of point A.

[0026] Figure 3 yes Figure 1 An enlarged view of point B.

[0027] Explanation of the reference numerals: 1. oil pillow box; 2. vertical partition; 3. airbag chamber; 4. oil chamber; 5. main airbag; 6. opening; 7. ventilation pipe; 8. respirator; 9. adjusting cylinder; 10. auxiliary airbag; 11. piston plate; 12. through hole; 13. first sealing ring; 14. sliding groove; 15. threaded sleeve; 16. connecting port; 17. connecting port; 18. second sealing ring. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0029] The present application embodiment discloses an oil pillow for a transformer. Figure 1 The transformer oil pillow comprises an oil pillow box 1, a vertical partition 2 is fixed in the oil pillow box 1, and the vertical partition 2 divides the inner cavity of the oil pillow box 1 into an air bag cavity 3 and an oil cavity 4, and the air bag cavity 3 and the oil cavity 4 are located on both sides of the vertical partition 2 in the horizontal direction. About half of the insulating oil is filled in the oil cavity 4, and the air part above the insulating oil is filled with nitrogen to reduce the oxidation of the insulating oil.

[0030] Reference Figure 1The airbag cavity 3 contains a main airbag 5, and an opening 6 is formed through the inner bottom wall of the airbag cavity 3. The vent of the main airbag 5 is sealed and connected to the inner wall of the opening 6, and the vent of the main airbag 5 is also sealed and connected to a vent pipe 7. The vent pipe 7 extends to the outside of the oil pillow box 1, and the end of the vent pipe 7 away from the main airbag 5 is connected to a respirator 8, which is filled with silica gel particles to make the air entering the main airbag 5 relatively dry.

[0031] Reference Figure 1 An adjusting cylinder 9 is fixed on the side of the vertical partition 2 facing the oil chamber 4. The length direction of the adjusting cylinder 9 is horizontal, and one end of the adjusting cylinder 9 in the length direction is fixed on the vertical partition 2. The adjusting cylinder 9 is opened at both ends. The adjusting cylinder 9 connects the airbag chamber 3 and the oil chamber 4, and the adjusting cylinder 9 is located above the liquid surface of the oil. An auxiliary airbag 10 is fixed in the adjusting cylinder 9. The auxiliary airbag 10 is a long cylinder with an opening at one end. The opening of the auxiliary airbag 10 faces the airbag chamber 3. The tube mouth of the auxiliary airbag 10 is circumferentially sealed and connected to the end of the adjusting cylinder 9 close to the airbag chamber 3. The end of the auxiliary airbag 10 away from the tube mouth is in the adjusting cylinder 9, and the end of the auxiliary airbag 10 away from the adjusting cylinder 9 extends toward the oil chamber 4.

[0032] Reference Figure 2 The inner wall of the adjusting cylinder 9 is slidably connected with a piston plate 11, a through hole 12 is provided on the piston plate 11, and the end of the auxiliary airbag 10 away from the airbag cavity 3 is sealed and fixed to the inner wall of the through hole 12. The sliding direction of the piston plate 11 extends along the length of the adjusting cylinder 9. A first sealing ring 13 is fixed on the piston plate 11, and the first sealing ring 13 is sealed to connect the piston plate 11 and the adjusting cylinder 9. The inner wall of the adjusting cylinder 9 is provided with a sliding groove 14 for the piston plate 11 to slide.

[0033] Reference Figure 1 , Figure 3 The tube mouth of the auxiliary airbag 10 is sealed and connected to the end of the adjustment tube 9 close to the airbag cavity 3 through a threaded sleeve 15, and a threaded groove is provided on the inner wall of the threaded sleeve 15. The end of the adjustment tube 9 protrudes the vertical partition 2 toward the side of the airbag cavity 3 to form a connecting port 16, and the threaded sleeve 15 is threadedly connected to the outer wall of the connecting port 16 through the threaded groove. The tube mouth of the auxiliary airbag 10 is sealed and pressed between the end of the adjustment tube 9 and the inner wall of the threaded sleeve 15, and a connecting port 17 is provided at the end of the threaded sleeve 15 away from the adjustment tube 9, so that the auxiliary airbag 10 is connected to the airbag cavity 3. A second sealing ring 18 is fixed on the inner wall of the threaded sleeve 15, and the second sealing ring 18 is pressed against the end face of the adjustment tube 9 to clamp the tube mouth of the auxiliary airbag 10 to form a seal, thereby improving the connection sealing of the auxiliary airbag 10.

[0034] The implementation principle of the transformer oil pillow of the embodiment of the present application is as follows: when in use, the heat-insulating oil expands and contracts, the auxiliary airbag 10 is deformed, and the piston plate 11 slides in the regulating cylinder 9, so that the main airbag 5 is deformed to adapt to the air pressure in the airbag chamber 3. Since the regulating cylinder 9 is located above the insulating oil, it is not easy for the insulating oil to contact the auxiliary airbag 10. Even if it contacts the auxiliary airbag 10, since the auxiliary airbag 10 is a long cylindrical piece with one end open, the contact area is small, thereby preventing the entry of water vapor, making the insulating oil not easy to get damp, and extending the service life of the insulating oil. In addition, the main airbag 5 and the auxiliary airbag 10 are arranged in double layers, so that the insulating oil is not easy to contact the air, and the sealing performance is good and the anti-oxidation performance is good.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil pillow for a transformer, comprising an oil pillow box (1), wherein a vertical partition (2) is arranged in the oil pillow box (1), wherein the inner cavity of the oil pillow box (1) comprises an air bag cavity (3) and an oil cavity (4) located on both sides of the vertical partition (2), wherein a main air bag (5) is arranged in the air bag cavity (3), wherein a vent of the main air bag (5) is connected to a vent pipe (7); wherein the vent pipe (7) extends to the outside of the oil pillow box (1); wherein the invention is characterized in that: An adjusting cylinder (9) is arranged on the side of the vertical partition (2) facing the oil chamber (4), and the adjusting cylinder (9) is located above the liquid surface of the oil; the adjusting cylinder (9) connects the airbag chamber (3) and the oil chamber (4), and an auxiliary airbag (10) is arranged inside the adjusting cylinder (9), and the auxiliary airbag (10) is a long cylinder with an opening at one end, and the cylinder mouth of the auxiliary airbag (10) is circumferentially sealed to the end of the adjusting cylinder (9) close to the airbag chamber (3), and the end of the auxiliary airbag (10) away from the cylinder mouth is inside the adjusting cylinder (9), and the end of the auxiliary airbag (10) away from the adjusting cylinder (9) extends toward the oil chamber (4).

2. The transformer oil conservator according to claim 1, characterized in that: The inner wall of the regulating cylinder (9) is slidably connected to a piston plate (11), a through hole (12) is provided on the piston plate (11), the end circumferential outer wall of the auxiliary airbag (10) away from the airbag cavity (3) is fixed to the inner wall of the through hole (12), and the sliding direction of the piston plate (11) extends along the length direction of the regulating cylinder (9).

3. The transformer oil conservator according to claim 2, characterized in that: A first sealing ring (13) is provided on the piston plate (11), and the first sealing ring (13) seals and connects the piston plate (11) and the regulating cylinder (9).

4. The transformer oil conservator according to claim 3, characterized in that: The inner wall of the regulating cylinder (9) is provided with a sliding groove (14) for the piston plate (11) to slide.

5. The transformer oil conservator according to claim 1, characterized in that: The tube mouth of the auxiliary airbag (10) is sealed and connected to the end of the adjustment tube (9) close to the airbag cavity (3) through a threaded sleeve (15); a threaded groove is provided on the inner wall of the threaded sleeve (15); the end of the adjustment tube (9) protrudes a vertical partition (2) toward one side of the airbag cavity (3); the threaded sleeve (15) is threadedly connected to the outer wall of the end of the adjustment tube (9) protruding toward the airbag cavity (3) through the threaded groove; the tube mouth of the auxiliary airbag (10) is sealed and pressed between the end of the adjustment tube (9) and the inner wall of the threaded sleeve (15); and a connecting port (17) is provided at the end of the threaded sleeve (15) away from the adjustment tube (9).

6. The transformer oil conservator according to claim 5, characterized in that: A second sealing ring (18) is fixed on the inner wall of the threaded sleeve (15), and the second sealing ring (18) is pressed against the end surface of the adjustment tube (9) to clamp the tube mouth of the auxiliary airbag (10).

7. The transformer oil conservator according to claim 1, characterized in that: The ventilation pipe (7) is connected to a respirator (8), and the respirator (8) is filled with silica gel particles.

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