An explosion-proof device for oil-immersed transformer

Abstract

The present invention discloses an oil-immersed transformer explosion-proof device, comprising a transformer body and a transfer box, and relates to the technical field of transformers. The oil-immersed transformer explosion-proof device, by disposing an explosion-proof mechanism, a filtering mechanism, and a unblocking mechanism between the transfer box and the transformer body, enables the device to quickly reduce the pressure in the transformer body when the internal pressure of the device is too high through the coordinated cooperation of the explosion-proof mechanism, the filtering mechanism, and the unblocking mechanism. The device also simultaneously performs nitrogen filling on the transformer oil to suppress fire and explosion hazards, filters the transformer oil to prevent the presence of conductive impurities in the oil, which could reduce the insulation performance of the transformer oil and cause local discharge and heat generation when a local electric field is concentrated, and continuously backflushes the filter element that filters the oil to keep the filter pores unobstructed.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to an explosion-proof device for an oil-immersed transformer. Background Art

[0002] Oil-immersed transformers use oil as their primary insulation and cooling mechanism. Their main components include the iron core, windings, oil tank, oil pillow, and breather. The iron core is a core-type structure with internal oil channels for easy oil circulation. The windings are key components in the transformer's electrical energy transmission. The oil tank holds the transformer oil and other components, and the oil pillow cushions the oil's thermal expansion and contraction.

[0003] Although oil-immersed transformers can facilitate insulation and heat dissipation through transformer oil, they inevitably still have shortcomings in actual use. The device lacks an explosion-proof mechanism, which causes the device to be affected by lightning overvoltage, operational overvoltage, overload, aging of the insulation layer, moisture in the transformer oil or acid decomposition of the oil, resulting in a decrease in insulation level. Once the insulation layer breaks down, phase-to-phase or turn-to-turn short circuits or grounding will occur inside the transformer, causing arcing. The arc decomposes the transformer oil to produce a large amount of gas, and the oil temperature and pressure suddenly increase, which may cause fire and explosion. Therefore, an oil-immersed transformer explosion-proof device is proposed to solve the existing problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides an oil-immersed transformer explosion-proof device, which solves the problem that the transformer in the device may be decomposed by oil heat, causing fire and explosion of the device.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oil-immersed transformer explosion-proof device, comprising a transformer body and a transfer box, the transfer box being fixedly arranged at the bottom of the transformer body by a bracket, the top of the transfer box being connected to a transfer cylinder, the top of the transfer box being fixedly connected to an oil pump by a bracket, the inlet end of the oil pump being connected to the transformer body through an oil inlet pipe, the outlet end of the oil pump being connected to the top of the transfer box through a pipeline, the top of the transfer cylinder being connected to the front side of the transformer body through an oil outlet pipe, the surface of the transfer box being provided with an explosion-proof mechanism, the interior of the transfer box being provided with a filtering mechanism, and the bottom of the transfer box being provided with a unblocking mechanism.

[0006] Preferably, the explosion-proof mechanism includes a delivery pump, which is fixedly arranged on one side of the transfer box through a bracket, the outlet end of the delivery pump is connected to a ring pipe, and the ring pipe and the transfer cylinder are connected through a number of branch pipes, the front side of the transfer box is fixedly connected to an air storage tank, and the air storage tank and the inlet end of the delivery pump are connected through an air intake pipe, the bottom of the transfer box is fixedly connected to a drive motor through a bracket, the output shaft of the drive motor is fixedly connected to a stirring shaft through a coupling, and one end of the stirring shaft passes through the transfer box and extends to the interior of the transfer cylinder, and a number of stirring blades are fixedly connected to the surface of the stirring shaft at equal intervals.

[0007] Preferably, the filtering mechanism includes a filter element, which is rotatably arranged inside the transfer box, and the bottom of the filter element extends to the bottom of the transfer box, the interior of the filter element is installed with a sealing plate by bolts, the interior of the sealing plate is rotatably provided with a rotating rod, the surface of the rotating rod is fixedly connected to a hollow scraper through a bracket, the bottom of the hollow scraper is fixedly connected to a vertical cleaning scraper used in conjunction with the filter element, the surfaces of the filter element and the stirring shaft are fixedly connected to pulleys, and a belt is connected for transmission between the two pulleys.

[0008] Preferably, the blockage-releasing mechanism includes an oil delivery box, which is fixedly arranged at the bottom of the transfer box by a bracket, and a rotating shaft is rotatably arranged between the top and bottom of the inner cavity of the oil delivery box, and two rotating shafts are symmetrically arranged, and the surface of the rotating shaft is fixedly connected to the first gear, and the two first gears are meshed with each other, one end of the rotating shaft located on the right side extends to the top of the oil delivery box, and the surface of the rotating shaft located on the right side is fixedly connected to the second gear, and the surface of the filter element is fixedly connected to the third gear meshed with the second gear, an oil suction pipe is connected between the rear side of the oil delivery box and the bottom of the transfer box, and an oil injection pipe is connected to the front side of the oil delivery box, and one end of the oil injection pipe extends to the interior of the transfer box and is fixedly connected to the top of the inner cavity of the transfer box.

[0009] Preferably, a plurality of protrusions are fixedly connected at equal intervals around the top of the hollow scraper, and a plurality of grooves matching the protrusions are provided at equal intervals around the top of the inner cavity of the transfer box and inside the filter element.

[0010] Preferably, a pressure sensor is fixedly provided on the top of the transformer body, and a central processing unit is provided on the front side of the transfer box.

[0011] Preferably, a heat exchange coil is fixedly connected to the surface of the transfer cylinder.

[0012] Preferably, a pressure relief valve is provided on the top of the transformer body.

[0013] Beneficial effects

[0014] The present invention provides an explosion-proof device for oil-immersed transformers. Compared with existing technologies, it has the following advantages:

[0015] (1) The explosion-proof device for oil-immersed transformers is provided with an explosion-proof mechanism, a filtering mechanism and a blocking-unblocking mechanism between the transfer box and the transformer body. The explosion-proof mechanism, the filtering mechanism and the blocking-unblocking mechanism are coordinated to facilitate the device to quickly reduce the pressure in the transformer body when the internal pressure of the device is too high. The transformer oil is simultaneously filled with nitrogen to suppress the fire and explosion hazards. The transformer oil is also filtered to avoid the presence of conductive impurities in the oil, which may lead to a decrease in the insulation performance of the transformer oil and the problem of local discharge and heat generation when the local electric field is concentrated. The filter element for filtering the oil is continuously backwashed to ensure that the filter pores of the filter element remain unobstructed.

[0016] (2) The oil-immersed transformer explosion-proof device installs a sealing plate inside the filter element and provides a hollow scraper on the top of the rotating rod. When the impurities inside the filter element need to be removed and processed regularly, the sealing plate can be disassembled and separated from the filter element, so that the sealing plate and the hollow scraper can be dragged downward, and the hollow scraper can scrape out the impurities inside the filter element and the inner wall.

[0017] (3) The explosion-proof device for oil-immersed transformers is provided with a heat exchange coil on the surface of the transfer cylinder, so that the transformer oil inside the transfer box can be indirectly heat-exchanged through water through the heat exchange coil during the nitrogen filling and transfer process, thereby reducing the oil temperature.

[0018] (4) The explosion-proof device for oil-immersed transformers is configured with a protrusion and a groove between the hollow scraper and the transfer box, so that the vertical cleaning scraper can be easily positioned and limited by the positioning cooperation of the protrusion and the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the external structure of the present invention;

[0020] Figure 2 A schematic diagram of the transfer box structure of the present invention;

[0021] Figure 3 Schematic diagram of the explosion-proof mechanism structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure inside the transfer box of the present invention;

[0023] Figure 5 Schematic diagram of the internal structure of the filter element of the present invention;

[0024] Figure 6 is a schematic diagram of the groove structure of the present invention;

[0025] Figure 7Schematic diagram of the fuel injection pipe structure of the present invention;

[0026] Figure 8 Schematic diagram of the blockage relieving mechanism structure of the present invention;

[0027] Figure 9 Schematic diagram of the internal structure of the oil delivery box of the present invention.

[0028] Figure: 1. Transformer body; 2. Transfer box; 3. Transfer cylinder; 4. Oil pump; 5. Oil inlet pipe; 6. Oil outlet pipe; 7. Explosion-proof mechanism; 701. Transfer pump; 702. Ring pipe; 703. Gas storage tank; 704. Inlet pipe; 705. Drive motor; 706. Stirring shaft; 707. Stirring blade; 8. Filter mechanism; 801. Filter element; 802. Sealing plate; 803. Rotating rod; 804. Hollow scraper Plate; 805, vertical cleaning scraper; 806, pulley; 807, belt; 808, bump; 809, groove; 9, unblocking mechanism; 901, oil delivery box; 902, rotating shaft; 903, first gear; 904, second gear; 905, third gear; 906, oil suction pipe; 907, oil injection pipe; 10, pressure sensor; 11, central processing unit; 12, heat exchange coil; 13, pressure relief valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] See also Figure 1-9 The present invention provides a technical solution: an oil-immersed transformer explosion-proof device, comprising a transformer body 1 and a transfer box 2, the transfer box 2 is fixedly arranged at the bottom of the transformer body 1 by a bracket, the top of the transfer box 2 is connected to a transfer cylinder 3, the top of the transfer box 2 is fixedly connected to an oil pump 4 through a bracket, the inlet end of the oil pump 4 is connected to the transformer body 1 through an oil inlet pipe 5, the outlet end of the oil pump 4 is connected to the top of the transfer box 2 through a pipeline, an oil outlet pipe 6 is connected between the top of the transfer cylinder 3 and the front side of the transformer body 1, a pressure sensor 10 is fixedly arranged on the top of the transformer body 1, a central processing unit 11 is arranged on the front side of the transfer box 2, a heat exchange coil 12 is fixedly connected to the surface of the transfer cylinder 3, and a pressure relief valve 13 is arranged on the top of the transformer body 1.

[0031] As a preferred embodiment, in order to facilitate the nitrogen filling and explosion-proofing of the transfer box 2, an explosion-proof mechanism 7 is provided on the surface of the transfer box 2, and the explosion-proof mechanism 7 includes a delivery pump 701, which is fixedly arranged on one side of the transfer box 2 through a bracket, and the outlet end of the delivery pump 701 is connected to an annular pipe 702, and the annular pipe 702 is connected to the transfer cylinder 3 through several branch pipes, the front side of the transfer box 2 is fixedly connected to an air storage tank 703, and the air storage tank 703 and the inlet end of the delivery pump 701 are connected through an air intake pipe 704, the bottom of the transfer box 2 is fixedly connected to a drive motor 705 through a bracket, the output shaft of the drive motor 705 is fixedly connected to a stirring shaft 706 through a coupling, and one end of the stirring shaft 706 passes through the transfer box 2 and extends to the interior of the transfer cylinder 3, and a plurality of stirring blades 707 are fixedly connected to the surface of the stirring shaft 706 at equal intervals.

[0032] As a preferred embodiment, in order to facilitate filtering of transformer oil impurities, a filtering mechanism 8 is provided inside the transfer box 2, and the filtering mechanism 8 includes a filter element 801, the filter element 801 is rotatably provided inside the transfer box 2, and the bottom of the filter element 801 extends to the bottom of the transfer box 2, the interior of the filter element 801 is fixed with a sealing plate 802 by bolts, and the interior of the sealing plate 802 is rotatably provided with a rotating rod 803, the surface of the rotating rod 803 is fixedly connected to a hollow scraper 804 through a bracket, and the bottom of the hollow scraper 804 is fixedly connected to a vertical cleaning scraper 805 used in conjunction with the filter element 801, the surfaces of the filter element 801 and the stirring shaft 706 are fixedly connected to pulleys 806, and a belt 807 is connected between the two pulleys 806;

[0033] Several protrusions 808 are fixedly connected at equal intervals around the top of the hollow scraper 804, and several grooves 809 that are used in conjunction with the protrusions 808 are equidistantly provided around the top of the inner cavity of the transfer box 2 and inside the filter element 801. As a detailed explanation: the outer surface of the hollow scraper 804 is provided with a rubber ring pad for squeezing, fitting and scraping with the filter element 801.

[0034] As a preferred embodiment, in order to facilitate the unclogging of the filter hole of the filter element 801, a unclogging mechanism 9 is provided at the bottom of the transfer box 2. The unclogging mechanism 9 includes an oil delivery box 901, which is fixed to the bottom of the transfer box 2 by a bracket. A rotating shaft 902 is provided between the top and bottom of the inner cavity of the oil delivery box 901, and two rotating shafts 902 are symmetrically provided. The surface of the rotating shaft 902 is fixedly connected to a first gear 903, and the two first gears 903 are meshed with each other. One end of the rotating shaft 902 on the right side extends to the oil delivery box 9 01, a second gear 904 is fixedly connected to the surface of the right rotating shaft 902, and a third gear 905 meshing with the second gear 904 is fixedly connected to the surface of the filter element 801. An oil suction pipe 906 is connected between the rear side of the oil delivery box 901 and the bottom of the transfer box 2, and an oil injection pipe 907 is connected to the front side of the oil delivery box 901, and one end of the oil injection pipe 907 extends to the interior of the transfer box 2 and is fixedly connected to the top of the inner cavity of the transfer box 2. As a detailed explanation: a plurality of spray holes are provided on the surface of the oil injection pipe 907.

[0035] The specific steps to enable it are as follows:

[0036] Connect the on-site circulating water to the heat exchange coil 12 in advance;

[0037] After the pressure sensor 10 detects that the pressure inside the transformer body 1 exceeds a preset value, it sends a signal to the central processing unit 11. The central processing unit 11 controls the oil delivery pump 4, the delivery pump 701, and the drive motor 705 to automatically start. The oil delivery pump 4 starts to pump the transformer oil inside the transformer body 1 into the transfer tank 2 through the oil inlet pipe 5. After some transformer oil is transferred to the transfer tank 2, the pressure inside the transformer body 1 is promptly reduced. After the transfer tank 2 is filled with transformer oil, the transformer oil is returned to the interior of the transformer body 1 through the oil outlet pipe 6.

[0038] When the delivery pump 701 is started, the nitrogen gas stored in the gas tank 703 is delivered to the interior of the transfer cylinder 3 through the air inlet pipe 704 and the annular pipe 702. The driving motor 705 is started to drive the stirring shaft 706 and the stirring blade 707 to rotate. The rotation of the stirring blade 707 stirs the transformer oil and nitrogen mixture and delivers them together to the interior of the transformer body 1, thereby isolating oxygen, suppressing the hidden dangers of fire and explosion, and suppressing the thermal cracking of the transformer. In addition, during the process of flushing the transformer oil with nitrogen, the circulating water flowing inside the heat exchange coil 12 is simultaneously used to cool the oil temperature.

[0039] During the process of the transformer oil in the transformer body 1 entering the transfer box 2, the transformer oil first enters the filter element 801 and is filtered from the inside to the outside through the filter holes on the surface of the filter element 801. When the synchronous drive motor 705 drives the stirring shaft 706 to rotate, the stirring shaft 706 drives the filter element 801 to rotate through the transmission cooperation of the pulley 806 and the belt 807. The filter element 801 rotates and its inner wall is scraped by the vertical cleaning scraper 805, so that impurities adhering to the inner wall of the filter element 801 are promptly removed.

[0040] When the filter element 801 rotates, the third gear 905 is driven to engage with the second gear 904, prompting the second gear 904 to drive the right rotating shaft 902 and the first gear 903 to rotate. The first gear 903 on the right is synchronously engaged with the first gear 903 on the left, thereby prompting the oil suction pipe 906 to introduce the transformer oil inside the transfer box 2 into the oil delivery box 901. The oil is then pressurized and transported through the engagement of the two first gears 903, prompting the oil injection pipe 907 to spray the transformer oil inside the oil delivery box 901 onto the surface of the filter element 801, and then backflushing the filter holes of the filter element 801 from the outside to the inside, prompting the impurities inside the filter holes of the filter element 801 to return to the inside of the filter element 801.

Claims

1. An explosion-proof device for an oil-immersed transformer, comprising a transformer body (1) and a transfer box (2), wherein the transfer box (2) is fixedly arranged at the bottom of the transformer body (1) by a bracket, and is characterized in that: The top of the transfer box (2) is connected to a transfer cylinder (3), and the top of the transfer box (2) is fixedly connected to an oil pump (4) through a bracket. The inlet end of the oil pump (4) is connected to the transformer body (1) through an oil inlet pipe (5), and the outlet end of the oil pump (4) is connected to the top of the transfer box (2) through a pipeline. An oil outlet pipe (6) is connected between the top of the transfer cylinder (3) and the front side of the transformer body (1). The surface of the transfer box (2) is provided with an explosion-proof mechanism (7), the interior of the transfer box (2) is provided with a filtering mechanism (8), and the bottom of the transfer box (2) is provided with a clearing and blocking mechanism (9); The filtering mechanism (8) comprises a filter element (801), the filter element (801) is rotatably arranged inside the transfer box (2), and the bottom of the filter element (801) extends to the bottom of the transfer box (2), the inside of the filter element (801) is fixed with a sealing plate (802) by means of bolts, the inside of the sealing plate (802) is rotatably provided with a rotating rod (803), the surface of the rotating rod (803) is fixedly connected to a hollow scraper (804) via a bracket, the bottom of the hollow scraper (804) is fixedly connected to a vertical cleaning scraper (805) used in conjunction with the filter element (801), the surfaces of the filter element (801) and the stirring shaft (706) are fixedly connected to pulleys (806), and a belt (807) is connected between the two pulleys (806); The blockage relieving mechanism (9) comprises an oil delivery box (901), the oil delivery box (901) is fixedly arranged at the bottom of the transfer box (2) through a bracket, a rotating shaft (902) is rotatably arranged between the top and bottom of the inner cavity of the oil delivery box (901), and two rotating shafts (902) are symmetrically arranged, and a first gear (903) is fixedly connected to the surface of the rotating shaft (902), and the two first gears (903) are meshed with each other. One end of the rotating shaft (902) on the right side extends to the top of the oil delivery box (901), and is located A second gear (904) is fixedly connected to the surface of the rotating shaft (902) on the right side, a third gear (905) meshing with the second gear (904) is fixedly connected to the surface of the filter element (801), an oil suction pipe (906) is connected between the rear side of the oil delivery box (901) and the bottom of the transfer box (2), and an oil injection pipe (907) is connected to the front side of the oil delivery box (901), and one end of the oil injection pipe (907) extends to the interior of the transfer box (2) and is fixedly connected to the top of the inner cavity of the transfer box (2).

2. The explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: The explosion-proof mechanism (7) comprises a delivery pump (701), which is fixedly arranged on one side of the transfer box (2) via a bracket, the outlet end of the delivery pump (701) is connected to a ring pipe (702), and the ring pipe (702) and the transfer cylinder (3) are connected via a plurality of branch pipes, the front side of the transfer box (2) is fixedly connected to an air storage tank (703), and the air storage tank (703) and the inlet end of the delivery pump (701) are connected via an air intake pipe (704), the bottom of the transfer box (2) is fixedly connected to a drive motor (705) via a bracket, the output shaft of the drive motor (705) is fixedly connected to a stirring shaft (706) via a coupling, and one end of the stirring shaft (706) passes through the transfer box (2) and extends to the interior of the transfer cylinder (3), and the surface of the stirring shaft (706) is fixedly connected to a plurality of stirring blades (707) at equal intervals.

3. The explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: Several protrusions (808) are fixedly connected at equal intervals around the top of the hollow scraper (804), and several grooves (809) for use with the protrusions (808) are equidistantly provided around the top of the inner cavity of the transfer box (2) and inside the filter element (801).

4. The explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: A pressure sensor (10) is fixedly provided on the top of the transformer body (1), and a central processing unit (11) is provided on the front side of the transfer box (2).

5. The explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: A heat exchange coil (12) is fixedly connected to the surface of the transfer cylinder (3).

6. The explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: A pressure relief valve (13) is provided on the top of the transformer body (1).

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