Anti-short-circuit silicon steel iron core oil-immersed transformer for photovoltaic power generation

Abstract

The invention discloses an anti-short-circuit silicon steel iron core oil-immersed transformer for photovoltaic power generation, which comprises a transformer oil tank and radiating fins, the radiating fins are hollow, and the radiating fins are communicated with the interior of the transformer oil tank; the outer ends of the cooling fins are connected with a plurality of flat oil cylinders, the inner ends of the flat oil cylinders are communicated with the cooling fins, pistons are connected into the flat oil cylinders in a sliding mode, the end faces, back on to the transformer oil tank, of the pistons are perpendicularly connected with connecting rods, the connecting rods penetrate out of the outer ends of the flat oil cylinders, and end plates are arranged on the outer sides of the outer ends of the flat oil cylinders. A plurality of fan blades are rotationally connected to the outer side faces of the cooling fins, gears are coaxially arranged on rotating shafts of the fan blades, racks are connected to the plate face, facing the transformer oil tank, of the end plate, and the racks are correspondingly meshed with the gears on the rotating shafts of the fan blades respectively. Thermal expansion energy of transformer oil is converted into kinetic energy of the fan blades, and the cooling fins are helped to improve the cooling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and more specifically to a short-circuit-resistant silicon steel core oil-immersed transformer for photovoltaic power generation. Background Art

[0002] Oil-immersed transformer is one of the important equipment in the power supply and distribution system of industrial and mining enterprises and civil buildings. It reduces the 10kV voltage to the 230V bus voltage used by users. This type of product is suitable for AC 50Hz, three-phase maximum rated capacity of 2500kVA, can be used indoors and outdoors, and can be installed on poles when the capacity is 315kVA or below. The ambient temperature is not higher than 40℃ and not lower than -25℃. Photovoltaic power generation scenes are generally in an environment rich in solar energy resources. Therefore, the existing silicon steel core oil-immersed transformers are not well suitable for photovoltaic power generation scenes. It is easy to heat up and damage the internal parts of the transformer. In extreme cases, it will cause a short circuit and decompose and gasify the transformer oil, which will cause great pressure on the transformer tank. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] In order to achieve these purposes and other advantages according to the present invention, a short-circuit-resistant silicon steel core oil-immersed transformer for photovoltaic power generation is provided, comprising: a transformer oil tank, a transformer core arranged in the transformer oil tank, and a tank cover arranged on the top of the transformer oil tank, wherein the tank cover is provided with high-voltage terminals, low-voltage terminals, a tap switch, an oil pillow, a gas relay, and an explosion-proof pipe, and a heat sink is provided on the side wall of the transformer oil tank, wherein the heat sink is hollow inside and the heat sink is connected to the inside of the transformer oil tank;

[0005] The outer end of the heat sink is connected with a plurality of flat oil cylinders at even intervals from top to bottom, the inner end of the flat oil cylinder is connected with the heat sink, a piston is slidably connected in the flat oil cylinder, the end surface of the piston facing away from the transformer oil tank is vertically connected with a connecting rod, the connecting rod passes through the outer end of the flat oil cylinder, an end plate is arranged outside the outer end of the flat oil cylinder, and the connecting rods in the plurality of flat oil cylinders are all connected with the end plate;

[0006] The outer side of the heat sink is evenly spaced from top to bottom and is connected to a plurality of fan blades, a gear is coaxially arranged on the rotating shaft of the fan blade, and a plurality of horizontally arranged racks are connected to the plate surface of the end plate facing the transformer oil tank, and the plurality of racks are respectively meshed with the gears on the rotating shafts of the plurality of fan blades;

[0007] The outer end of the flat oil cylinder is provided with an air pressure balance hole connected with the interior thereof, and a first spring is further provided between the inner wall of the outer end of the flat oil cylinder and the piston inside thereof. When the transformer oil expands due to heat, the transformer oil pushes the piston away from the transformer oil tank and enters the flat oil cylinder to increase the heat dissipation surface. The piston compresses the first spring and drives the rack to move, the rack drives the gear to rotate, and the gear drives the fan blades to rotate to dissipate heat. When the transformer oil cools down and shrinks, the first spring drives the piston to push the liquid transformer oil in the flat oil cylinder back to the transformer oil tank.

[0008] Preferably, a bearing is provided on the outer side of the heat sink, and the rotating shaft of the fan blade is fixedly connected to the center hole of the bearing. The fan blade comprises:

[0009] The annular portion has an inner wall with a first blind hole radially formed therein, a second spring is disposed in the first blind hole, a cylindrical pin is connected to the front end of the second spring, a second blind hole is formed on the rotating shaft of the fan blade at a position opposite to the first blind hole, and the front end of the cylindrical pin is inserted into the second blind hole;

[0010] A plurality of blades are evenly spaced and arranged on the circumferential surface of the annular portion, and a counterweight portion is arranged at the end of each blade;

[0011] When the gear drives the fan blades to rotate at a certain speed, the centrifugal force of the cylindrical pin is greater than the sum of the elastic force of the second spring and its own gravity, so that the front end of the cylindrical pin retreats from the second blind hole to the first blind hole, and the plurality of blades drive the annular part to rotate around the rotating axis of the fan blade under the inertia of the counterweight part.

[0012] Preferably, a first annular stopper is provided on the rotating shaft of the fan blade to abut against the rear end of the annular portion, and a second stopper is threadedly connected to the front end of the rotating shaft to abut against the front end of the annular portion.

[0013] Preferably, the surfaces of the rotating shaft, the first annular stopper, and the second stopper in contact with the annular portion are all coated with a wear-resistant and drag-reducing coating.

[0014] Preferably, the inner wall of the transformer oil tank is provided with tic-tac-toe reinforcing ribs.

[0015] Preferably, angle steel is provided at the angle between two adjacent walls inside the transformer oil tank to strengthen the connection.

[0016] Preferably, a flange portion is provided on the top edge of the transformer oil tank, and the tank cover is bolted to the flange portion.

[0017] Preferably, a support rod is provided on the outer top surface of the box cover, and a heat insulation board covering the transformer is provided on the support rod.

[0018] Preferably, the bottom of the transformer oil tank is fixed on a liftable platform.

[0019] The present invention includes at least the following beneficial effects: the anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation can convert the thermal expansion energy of transformer oil into the kinetic energy of fan blades, helping the heat sink to improve the heat dissipation effect, and at the same time, the sliding characteristics of the piston in the flat oil cylinder make the space in the transformer oil tank that can accommodate transformer oil change with the pressure, reducing the pressure load of the transformer oil tank under high oil temperature conditions, improving its anti-expansion ability, and the transformer oil entering the flat oil cylinder also increases the heat dissipation area, further improving the heat dissipation effect. Therefore, the structural improvement of the transformer oil tank comprehensively improves the anti-short-circuit ability of the silicon steel core oil-immersed transformer for photovoltaic power generation, achieving multiple goals at one stroke.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the side structure of a silicon steel core oil-immersed transformer in the prior art;

[0022] Figure 2 A top view of the transformer oil tank according to an embodiment of the present invention;

[0023] Figure 3 A front view of the side surface of the heat sink according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the internal structure of the heat sink and the flat oil cylinder and other structures according to the embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the internal structure of the fan blade according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figures 1 to 5 As shown, the present invention provides a short-circuit-resistant silicon steel core oil-immersed transformer for photovoltaic power generation, comprising: a transformer oil tank 1, a transformer core arranged in the transformer oil tank 1, and a tank cover arranged on the top of the transformer oil tank 1, wherein the tank cover is provided with high-voltage terminals, low-voltage terminals, a tap switch, an oil pillow, a gas relay, and an explosion-proof pipe, and a heat sink 2 is provided on the side wall of the transformer oil tank, wherein the heat sink 2 is hollow inside and the heat sink 2 is connected to the inside of the transformer oil tank;

[0029] The outer end of the heat sink 2 is connected with a plurality of flat oil cylinders 3 at even intervals from top to bottom, the inner end of the flat oil cylinder 3 is connected with the heat sink 2, a piston 4 is slidably connected in the flat oil cylinder 3, the end surface of the piston 4 facing away from the transformer oil tank 1 is vertically connected with a connecting rod 5, the connecting rod 5 passes through the outer end of the flat oil cylinder 3, an end plate 6 is arranged on the outer side of the outer end of the flat oil cylinder 3, and the connecting rods 5 in the plurality of flat oil cylinders 3 are all connected with the end plate 6;

[0030] The outer side of the heat sink 2 is evenly spaced from top to bottom and is connected to a plurality of blades 7, a gear 8 is coaxially arranged on the rotating shaft 13 of the blade 7, and a plurality of horizontally arranged racks 9 are connected to the plate surface of the end plate 6 facing the transformer oil tank 1, and the plurality of racks 9 are respectively meshed with the gears 8 on the rotating shaft 13 of the plurality of blades 7;

[0031] The outer end of the flat oil cylinder 3 is provided with an air pressure balance hole 10 connected with the interior thereof, and a first spring 11 is further provided between the inner wall of the outer end of the flat oil cylinder 3 and the piston 4 therein. When the transformer oil expands due to heat, the transformer oil pushes the piston 4 away from the transformer oil tank 1 and enters the flat oil cylinder 3 to increase the heat dissipation surface. The piston 4 compresses the first spring 11 and drives the rack 9 to move, the rack 9 drives the gear 8 to rotate, and the gear 8 drives the fan blades 7 to rotate to dissipate heat. When the transformer oil cools down and shrinks, the first spring 11 drives the piston 4 to push the liquid transformer oil in the flat oil cylinder 3 back to the transformer oil tank 1.

[0032] Specifically, the outer end of the component in the above embodiment refers to an end of the component away from the transformer box.

[0033] Specifically, the thickness of the flat oil cylinder 3 is the same as that of the heat sink 2 , and the piston 4 is adapted to the inner cross section of the flat oil cylinder 3 to achieve sliding sealing.

[0034] The working process of the above embodiment is as follows: when the transformer oil in the transformer oil tank 1 expands due to heat, the transformer oil pushes the piston 4 away from the transformer oil tank 1, and at the same time, the transformer oil enters the flat oil cylinder 3 to increase the heat dissipation surface, the piston 4 compresses the first spring 11 and drives the rack 9 to move away from the transformer oil tank 1, the rack 9 drives the gear 8 to rotate, and the gear 8 drives the fan blades 7 to rotate to dissipate heat. When the transformer oil cools down and shrinks, the first spring 11 drives the piston 4 to push the liquid transformer oil in the flat oil cylinder 3 back to the transformer oil tank 1.

[0035] From the above working process, it can be known that the photovoltaic power generation anti-short circuit silicon steel core oil-immersed transformer can convert the thermal expansion energy of transformer oil into the kinetic energy of the fan blades 7, helping the heat sink 2 to improve the heat dissipation effect. At the same time, the sliding characteristics of the piston 4 in the flat oil cylinder 3 make the space in the transformer oil tank 1 that can accommodate transformer oil change with the pressure, reducing the pressure load of the transformer oil tank 1 under high oil temperature conditions, improving its anti-expansion ability, and the transformer oil entering the flat oil cylinder 3 also increases the heat dissipation area, further improving the heat dissipation effect. Therefore, the structural improvement of the transformer oil tank 1 comprehensively improves the anti-short circuit ability of the photovoltaic power generation silicon steel core oil-immersed transformer, achieving multiple goals at one stroke.

[0036] In another embodiment, a bearing 12 is disposed on the outer side of the heat sink 2, and a rotating shaft 13 of the fan blade 7 is fixedly connected to a central hole of the bearing 12. The fan blade 7 includes:

[0037] The annular portion 14 has an inner wall with a first blind hole radially formed therein, a second spring 15 is disposed in the first blind hole, a cylindrical pin 16 is connected to the front end of the second spring 15, a second blind hole is formed on the rotating shaft 13 of the fan blade 7 at a position opposite to the first blind hole, and the front end of the cylindrical pin 16 is inserted into the second blind hole;

[0038] A plurality of blades 17 are evenly spaced and arranged on the circumference of the annular portion 14, and a counterweight is arranged at the end of each blade 17;

[0039] When the gear 8 drives the fan blade 7 to rotate at a certain speed, the centrifugal force of the cylindrical pin 16 is greater than the sum of the elastic force of the second spring 15 and its own gravity, so that the front end of the cylindrical pin 16 retreats from the second blind hole to the first blind hole, and the plurality of blades 17 drive the annular portion 14 to rotate around the rotating shaft 13 of the fan blade 7 under the inertia of the counterweight portion.

[0040] The working process of the above embodiment is as follows: when the transformer oil in the transformer tank 1 expands due to heat, the transformer oil pushes the piston 4 away from the transformer tank 1, and at the same time, the transformer oil enters the flat oil cylinder 3 to increase the heat dissipation surface, the piston 4 compresses the first spring 11 and drives the rack 9 to move away from the transformer tank 1, the rack 9 drives the gear 8 to rotate, and the gear 8 drives the shaft 13 of the fan blade 7 to rotate. Since the second spring 15 initially presses the cylindrical pin 16 to connect the shaft 13 of the fan blade 7 and the annular portion 14, the shaft 13 of the fan blade 7 and the annular portion connected thereto are 14 and the blades 17 on the annular portion 14 rotate simultaneously. When the rotation speed of the annular portion 14 reaches a certain speed, the centrifugal force of the cylindrical pin 16 is greater than the sum of the elastic force of the second spring 15 and its own gravity, so that the front end of the cylindrical pin 16 retreats from the second blind hole to the first blind hole. Under the inertia of the counterweight part, the plurality of blades 17 continue to drive the annular portion 14 to rotate around the rotating shaft 13 of the fan blade 7. When the elastic force on the first spring 11 is balanced with the pressure on the piston 4, the rack 9 stops moving, and the gear 8 meshing with the rack 9 also stops rotating, so the rotating shaft 13 of the fan blade 7 also stops rotating. When the rotation speed of the annular portion 14 gradually decreases, the centrifugal force on the cylindrical pin 16 gradually decreases, and the elastic force applied to the cylindrical pin 16 by the second spring 15 forces the cylindrical pin 16 to press against the surface of the rotating shaft 13 of the fan blade 7. When the annular portion 14 rotates, the cylindrical pin 16 touches the second blind hole and extends into it, thereby reconnecting the annular portion 14 and the rotating shaft 13 of the fan blade 7.

[0041] From the above working process, it can be seen that the structural improvement of the above-mentioned fan blade 7 allows the annular portion 14 and the plurality of blades 17 to continue rotating for a period of time after the rotating shaft 13 stops rotating, thereby effectively extending the time of enhancing the heat dissipation effect.

[0042] Furthermore, a first annular stopper 18 is provided on the rotating shaft 13 of the fan blade 7 to abut against the rear end of the annular portion 14 , and a second stopper is threadedly connected to the front end of the rotating shaft 13 to abut against the front end of the annular portion 14 .

[0043] The first annular stopper 18 and the second annular stopper 19 can limit the annular portion 14 so that the second blind hole is located on the annular path of the cylindrical pin 16. The second annular stopper 19 is threadedly connected to the rotating shaft 13, so the second annular stopper 19 can be removed from the rotating shaft 13, which is convenient for disassembly and maintenance of the annular portion 14.

[0044] Furthermore, the surfaces of the rotating shaft 13, the first annular stopper 18, and the second stopper in contact with the annular portion 14 are coated with a wear-resistant and drag-reducing coating, which can reduce the friction resistance when the annular portion 14 rotates, thereby extending the rotation and heat dissipation time of the fan blades 7.

[0045] In another embodiment, the inner wall of the transformer oil tank 1 is provided with lattice-shaped reinforcement ribs 20. The lattice-shaped reinforcement ribs 20 can increase the structural strength of the box wall plate, making it more resistant to expansion and impact.

[0046] Furthermore, angle steels 21 are provided at the angles between two adjacent walls inside the transformer oil tank 1 to strengthen the connection, improve the structural integrity and rigidity of the tank, and reduce the probability of thermal deformation of the tank.

[0047] Furthermore, a flange portion is provided on the top edge of the transformer oil tank 1, and the tank cover is bolted to the flange portion.

[0048] In another embodiment, a support rod is provided on the top surface of the box cover, and a heat insulation board covering the transformer is provided on the support rod. The heat insulation board can shield the transformer from light and rain, and reduce the influence of light temperature rise on the transformer.

[0049] In another embodiment, the bottom of the transformer oil tank 1 is fixed on a liftable pedestal. The liftable pedestal can be a hydraulic lift pedestal or a screw lift pedestal. The liftable pedestal can change the height of the transformer from the ground to prevent the transformer from being soaked by rainwater when there is too much water on the ground.

[0050] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A short-circuit-resistant silicon steel core oil-immersed transformer for photovoltaic power generation, comprising: a transformer oil tank, a transformer core arranged in the transformer oil tank, and a tank cover arranged on the top of the transformer oil tank, wherein the tank cover is provided with high-voltage terminals, low-voltage terminals, a tap switch, an oil pillow, a gas relay, and an explosion-proof pipe, and the side wall of the transformer oil tank is provided with a heat sink, characterized in that: The heat sink is hollow inside, and the heat sink is connected to the inside of the transformer oil tank; The outer end of the heat sink is connected with a plurality of flat oil cylinders at even intervals from top to bottom, the inner end of the flat oil cylinder is connected with the heat sink, a piston is slidably connected in the flat oil cylinder, the end surface of the piston facing away from the transformer oil tank is vertically connected with a connecting rod, the connecting rod passes through the outer end of the flat oil cylinder, an end plate is arranged outside the outer end of the flat oil cylinder, and the connecting rods in the plurality of flat oil cylinders are all connected with the end plate; The outer side of the heat sink is evenly spaced from top to bottom and is connected to a plurality of fan blades, a gear is coaxially arranged on the rotating shaft of the fan blade, and a plurality of horizontally arranged racks are connected to the plate surface of the end plate facing the transformer oil tank, and the plurality of racks are respectively meshed with the gears on the rotating shafts of the plurality of fan blades; The outer end of the flat oil cylinder is provided with an air pressure balance hole connected with the interior thereof, and a first spring is further provided between the inner wall of the outer end of the flat oil cylinder and the piston inside thereof. When the transformer oil expands due to heat, the transformer oil pushes the piston away from the transformer oil tank and enters the flat oil cylinder to increase the heat dissipation surface. The piston compresses the first spring and drives the rack to move, the rack drives the gear to rotate, and the gear drives the fan blades to rotate to dissipate heat. When the transformer oil cools down and shrinks, the first spring drives the piston to push the liquid transformer oil in the flat oil cylinder back to the transformer oil tank.

2. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: The outer side of the heat sink is provided with a bearing, the rotating shaft of the fan blade is fixedly connected to the central hole of the bearing, and the fan blade comprises: The annular portion has an inner wall with a first blind hole radially formed therein, a second spring is disposed in the first blind hole, a cylindrical pin is connected to the front end of the second spring, a second blind hole is formed on the rotating shaft of the fan blade at a position opposite to the first blind hole, and the front end of the cylindrical pin is inserted into the second blind hole; A plurality of blades are evenly spaced and arranged on the circumferential surface of the annular portion, and a counterweight portion is arranged at the end of each blade; When the gear drives the fan blades to rotate at a certain speed, the centrifugal force of the cylindrical pin is greater than the sum of the elastic force of the second spring and its own gravity, so that the front end of the cylindrical pin retreats from the second blind hole to the first blind hole, and the plurality of blades drive the annular part to rotate around the rotating axis of the fan blade under the inertia of the counterweight part.

3. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 2, characterized in that: A first annular stopper is arranged on the rotating shaft of the fan blade to abut against the rear end of the annular portion, and a second stopper is threadedly connected to the front end of the rotating shaft to abut against the front end of the annular portion.

4. The photovoltaic power generation anti-short circuit silicon steel core oil-immersed transformer according to claim 2, characterized in that: The surfaces of the rotating shaft, the first annular stopper, and the second stopper in contact with the annular portion are all coated with a wear-resistant and drag-reducing coating.

5. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: The inner wall of the transformer oil tank is provided with tic-tac-toe reinforcing ribs.

6. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: Angle steel is arranged at the included angle between two adjacent walls inside the transformer oil tank to strengthen the connection.

7. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: The top edge of the transformer oil tank is provided with a flange portion, and the tank cover is bolted to the flange portion.

8. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: A support rod is arranged on the outer top surface of the box cover, and a heat insulation board covering the transformer is arranged on the support rod.

9. The anti-short-circuit silicon steel core oil-immersed transformer for photovoltaic power generation according to claim 1, characterized in that: The bottom of the transformer oil tank is fixed on a liftable platform.

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