A heat dissipation structure of a transformer for photovoltaic power generation

Abstract

The invention discloses a heat dissipation structure of a transformer for photovoltaic power generation, which relates to the field of transformer heat dissipation and comprises a plurality of heat sinks, an oil inlet pipe and an oil outlet pipe respectively connected to two ends of the heat sinks, and a plurality of oil circuits respectively installed inside the plurality of heat sinks, wherein the two ends of the oil circuits are respectively connected to the oil inlet pipe and the oil outlet pipe, and an auxiliary heat dissipation mechanism is arranged between two adjacent heat sinks for guiding out the hot air between the two heat sinks; an oil guide mechanism is arranged between a connecting frame and the oil circuit for accelerating the flow speed of high-viscosity vegetable oil inside the oil circuit; the oil guide mechanism comprises a piston installed inside the oil circuit and a power component for driving the piston to move; the heat dissipation structure of the transformer for photovoltaic power generation can guide out the hot air between the two heat sinks, thereby improving the continuous heat dissipation effect on the transformer, effectively accelerating the flow speed of the high-viscosity vegetable oil inside the oil circuit, and further improving the heat dissipation effect on the transformer.

Description

Technical Field

[0001] The invention relates to transformer heat dissipation technology, and in particular to a heat dissipation structure of a transformer for photovoltaic power generation. Background Art

[0002] Transformers are essential equipment in the photovoltaic power generation industry, among which oil-immersed transformers are more commonly used. The iron core and coil of oil-immersed transformers will generate a lot of heat during operation. The heat is diffused outward by means of heat conduction and convection to ensure the normal and stable operation of the transformer. The transformer heat dissipation structure is a heat exchanger used to reduce the temperature of the cooling oil used in the transformer by dissipating the heat in the oil to the surrounding air. The cooling oil can be vegetable oil or mineral oil.

[0003] When the existing transformer heat dissipation structure is in use, the hot air circulation speed between two adjacent heat sinks is slow, which affects the continuous heat dissipation effect of the transformer. In addition, the heat dissipation structure using vegetable oil as cooling oil affects the thermal conductivity due to the high kinematic viscosity of vegetable oil. Summary of the invention

[0004] The purpose of the present invention is to provide a heat dissipation structure for a photovoltaic power generation transformer to solve the problem that the hot air circulation speed between two adjacent heat sinks in the prior art is slow, affecting the continuous heat dissipation effect of the transformer. In addition, the heat dissipation structure using vegetable oil as cooling oil affects the thermal conductivity due to the high kinematic viscosity of vegetable oil.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a heat dissipation structure of a photovoltaic power transformer, comprising a plurality of heat sinks, an oil inlet pipe and an oil outlet pipe respectively connected to both ends of the heat sinks, and a plurality of oil paths respectively installed inside the plurality of heat sinks, the two ends of the oil paths being respectively connected to the oil inlet pipe and the oil outlet pipe, and an auxiliary heat dissipation mechanism being arranged between two adjacent heat sinks for guiding out the hot air between the two heat sinks;

[0006] The auxiliary heat dissipation mechanism includes a connecting frame, a displacement component for driving the connecting frame to move along the length direction of the heat sink, a fan blade installed on the connecting frame, and a linkage component for driving the fan blade to rotate;

[0007] An oil guide mechanism is provided between the connecting frame and the oil circuit to accelerate the flow speed of the high-viscosity vegetable oil in the oil circuit;

[0008] The oil guide mechanism comprises a piston installed inside the oil circuit and a power assembly for driving the piston to move.

[0009] Furthermore, the displacement assembly includes a guide rod installed between two adjacent heat sinks along the length direction of the heat sink and a slider slidably sleeved on the outside of the guide rod, and the connecting frame is fixedly connected to the outer wall of the slider.

[0010] Furthermore, a motor is installed above one of the heat sinks, a reciprocating screw is connected to the output end of the motor, one of the sliders is screwed to the outside of the reciprocating screw, and a plurality of the connecting frames are connected by connecting strips.

[0011] Furthermore, the linkage assembly includes a transmission shaft rotatably connected between the slider and the connecting frame along the width direction of the heat sink, a first one-way gear installed outside the transmission shaft, and a rack fixed to the outer wall of the heat sink along the length direction, and the first one-way gear is meshed with the rack.

[0012] Furthermore, a through groove is provided on the outer wall of the connecting frame, the fan blade is located inside the through groove, the fan blade is fixedly sleeved on the outside of the transmission shaft, the fan blade is an exhaust fan, and a dust removal mechanism for cleaning the surface of the heat sink is provided on one side of the transmission shaft.

[0013] Furthermore, the dust removal mechanism includes a brush roller connected to the inner side wall of the connecting frame and rotatable along the width direction of the heat sink, and a second one-way gear connected to the input end of the brush roller, and the second one-way gear is meshed with the rack.

[0014] Furthermore, an oil guide groove is provided in the interior of the piston along its axial direction, and a sealing cover is hingedly connected to one end of the piston.

[0015] Furthermore, the power assembly includes an electromagnet installed on the outer wall of the connecting frame and a magnet ring installed inside the piston along the axial direction thereof, the electromagnet is located directly above the magnet ring, and the electromagnet cooperates with the magnet ring.

[0016] Furthermore, an inclined groove is formed at one end of the piston away from the sealing cover.

[0017] Compared with the prior art, the heat dissipation structure of a photovoltaic power generation transformer provided by the present invention has the following beneficial effects:

[0018] 1. When the driving slider and the connecting frame move to the right, the transmission shaft is driven to move synchronously, and the first one-way gear is meshed with the rack to drive the transmission shaft to rotate, thereby driving the fan blades to rotate synchronously, thereby leading out the hot air between the two heat sinks, thereby improving the continuous heat dissipation effect of the transformer;

[0019] 2. When the slider and the connecting frame are driven to move to the right, the second one-way gear meshes with the rack to drive the brush roller to rotate, thereby cleaning the dust attached to the top of the heat sink and cleaning it in the direction of the transmission shaft. When the fan blades rotate to exhaust, the cleaned dust can be discharged, avoiding the problem of too much dust attached to the outside of the heat sink affecting its heat dissipation to the air;

[0020] 3. When the connecting frame and the energized electromagnet are driven to move to the left, the sealing cover is installed on the left side of the piston, which can seal the piston. Then, the piston is driven to move to the left synchronously through the attraction between the electromagnet and the magnet ring, thereby promoting the synchronous movement of the vegetable oil in the oil circuit, and then circulating a part of the vegetable oil in the oil circuit that has been heat-dissipated by the heat sink into the oil tank inside the transformer. At the same time, the suction force generated by the leftward movement of the piston replenishes a part of the hot oil in the oil tank into the oil circuit, thereby effectively accelerating the flow speed of the high-viscosity vegetable oil inside the oil circuit, and further improving the heat dissipation effect of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of the auxiliary heat dissipation mechanism and the dust removal mechanism provided in an embodiment of the present invention;

[0024] Figure 3 The embodiment of the present invention provides Figure 2 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 4 A schematic diagram of the auxiliary heat dissipation mechanism, dust removal mechanism and electromagnet structure provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the external structure of the oil circuit provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the internal structure of the oil circuit provided by an embodiment of the present invention;

[0028] Figure 7 A schematic cross-sectional view of a piston structure provided in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. Heat sink; 2. Oil inlet pipe; 3. Oil circuit; 4. Connecting frame; 5. Fan blade; 6. Piston; 7. Reciprocating screw; 8. Slider; 9. Transmission shaft; 10. First one-way gear; 11. Rack; 12. Through groove; 13. Brush roller; 14. Second one-way gear; 15. Motor; 16. Connecting strip; 17. Oil guide groove; 18. Sealing cover; 19. Electromagnet; 20. Magnetic ring; 21. Bevel groove; 22. Guide rod; 23. Oil outlet pipe. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figure 1 - Figure 3 , a heat dissipation structure of a transformer for photovoltaic power generation, comprising a plurality of heat sinks 1, an oil inlet pipe 2 and an oil outlet pipe 23 respectively connected to both ends of the heat sink 1, and a plurality of oil paths 3 respectively installed inside the plurality of heat sinks 1, the two ends of the oil paths 3 are respectively connected to the oil inlet pipe 2 and the oil outlet pipe 23, the plurality of heat sinks 1 are arranged in sequence from top to bottom, and the distance between two adjacent heat sinks 1 is the same, and an auxiliary heat dissipation mechanism is arranged between two adjacent heat sinks 1 for exporting hot air between the two heat sinks 1; the auxiliary heat dissipation mechanism comprises a connecting frame 4, a displacement component for driving the connecting frame 4 to move along the length direction of the heat sink 1, a fan blade 5 installed on the connecting frame 4, and a linkage component for driving the fan blade 5 to rotate; a through groove 12 is opened on the outer wall of the connecting frame 4, the fan blade 5 is located inside the through groove 12, the fan blade 5 is fixedly sleeved on the outside of the transmission shaft 9, and the fan blade 5 is an exhaust fan, The displacement assembly includes a guide rod 22 installed between two adjacent heat sinks 1 along the length direction of the heat sink 1 and a slider 8 slidably sleeved on the outside of the guide rod 22, a connecting frame 4 is fixedly connected to the outer wall of the slider 8, a motor 15 is installed above one of the heat sinks 1, and the output end of the motor 15 is connected to the reciprocating screw 7, one of the sliders 8 is screwed to the outside of the reciprocating screw 7, the motor 15 is installed on the outer wall of the transformer, and a protective shell is installed on the outside of the motor 15, and multiple connecting frames 4 are connected by connecting strips 16. The reciprocating screw 7 is driven to rotate by starting the motor 15, and then the slider 8 screwed to the outside of the reciprocating screw 7 is driven to reciprocate left and right along the length direction of the reciprocating screw 7, thereby driving the connecting frame 4 fixedly connected to the slider 8 to move synchronously, and the multiple connecting frames 4 are connected by the connecting strip 16, so as to drive the multiple connecting frames 4 to reciprocate left and right synchronously;

[0033] The linkage assembly includes a transmission shaft 9 that is connected and rotated between the slider 8 and the connecting frame 4 along the width direction of the heat sink 1, a first one-way gear 10 installed on the outside of the transmission shaft 9, and a rack 11 fixed to the outer wall of the heat sink 1 along the length direction of the heat sink 1. The first one-way gear 10 is meshed with the rack 11. When the slider 8 and the connecting frame 4 move to the right, the transmission shaft 9 is driven to move synchronously. Through the meshing effect of the first one-way gear 10 and the rack 11, the transmission shaft 9 is driven to rotate, and then the fan blades 5 are driven to rotate synchronously, so that the hot air between the two heat sinks 1 is discharged, thereby improving the continuous heat dissipation effect of the transformer. When the transmission shaft 9 moves to the left, the first one-way gear 10 rotates but does not drive the transmission shaft 9 to rotate, so the transmission shaft 9 is a one-way rotation when moving to the right.

[0034] In terms of safety, the flash point of vegetable oil transformer oil exceeds 300℃, which is much higher than that of mineral oil transformer oil; in terms of heat dissipation, vegetable oil transformer oil has a higher thermal conductivity; the triglycerides in vegetable oil transformer oil are easily hydrolyzed, so it has a higher acid value; the freezing point of vegetable oil transformer oil is higher than that of mineral oil transformer oil, but the low-temperature performance of vegetable oil transformer oil can be improved by selecting vegetable oil with lower fatty acid saturation and adding pour point depressants; the molecular polarity of vegetable oil transformer oil is higher than that of mineral oil transformer oil, so vegetable oil transformer oil has a higher dielectric constant, which can make the electric field distribution more uniform.

[0035] Example 2: Please refer to Figure 2 - Figure 4 The present embodiment provides a technical solution based on the embodiment 1: a dust removal mechanism for cleaning the surface of the heat sink 1 is provided on one side of the transmission shaft 9, the dust removal mechanism comprises a brush roller 13 connected to the inner side wall of the connecting frame 4 and rotating along the width direction of the heat sink 1 and a second one-way gear 14 connected to the input end of the brush roller 13, the second one-way gear 14 is meshed with the rack 11, and when the slider 8 and the connecting frame 4 move to the right, the second one-way gear 14 is meshed with the rack 11, and the brush roller 13 is driven to rotate, thereby cleaning the dust attached to the top of the heat sink 1 and cleaning it in the direction of the transmission shaft 9, and then when the fan blades 5 rotate to exhaust, the cleaned dust can be discharged accordingly, avoiding the problem that the amount of dust attached to the outside of the heat sink 1 is large and affects its heat dissipation to the air, and when the brush roller 13 is driven to move to the left, the second one-way gear 14 rotates, but does not drive the brush roller 13 to rotate, so the brush roller 13 is a one-way rotation when moving to the right.

[0036] Example 3: Please refer to Figure 3 - Figure 7, this embodiment provides a technical solution based on embodiment 1 and embodiment 2: an oil guide mechanism is arranged between the connecting frame 4 and the oil circuit 3, which is used to accelerate the flow speed of the high-viscosity vegetable oil in the oil circuit 3, the oil inlet pipe 2 and the oil outlet pipe 23 are both connected to the oil tank inside the transformer, the heat generated by the operation of the transformer is introduced into the vegetable oil in the oil tank, and the vegetable oil is used for heat conduction, and finally the heat is guided to the air through the heat sink 1, the oil guide mechanism includes a piston 6 installed in the oil circuit 3 and a power assembly for driving the piston 6 to move, the interior of the piston 6 is provided with an oil guide groove 17 along its axial direction, one end of the piston 6 is hinged with a sealing cover 18, the power assembly includes an electromagnet 19 installed on the outer wall of the connecting frame 4 and a magnet ring 20 installed in the interior of the piston 6 along the axial direction, the electromagnet 19 is located directly above the magnet ring 20, the electromagnet 19 cooperates with the magnet ring 20, only one piston 6 is arranged in an oil circuit 3, and the piston 6 moves along the horizontal path of the oil circuit 3, when the connecting frame 4 moves along the heat sink When the sheet 1 moves left and right in the length direction, it drives the energized electromagnet 19 to move synchronously. In this process, when the electromagnet 19 is driven to move to the left, since the sealing cover 18 is installed on the left side of the piston 6, it can play a sealing role for the piston 6, and then through the opposite attraction between the electromagnet 19 and the magnet ring 20, the piston 6 is driven to move to the left synchronously, thereby pushing the vegetable oil in the oil circuit 3 to move synchronously, and then a part of the vegetable oil in the oil circuit 3 that has been heat-dissipated by the heat sink 1 is sent to the internal oil tank of the transformer through the oil outlet pipe 23. At the same time, the suction force generated by the leftward movement of the piston 6 replenishes a part of the hot oil in the oil tank into the oil circuit 3 through the oil inlet pipe 2. When the electromagnet 19 is driven to move to the right, the piston 6 moves synchronously, and the vegetable oil in the oil circuit 3 passes through the oil guide groove 17 to push the sealing cover 18 open, thereby avoiding the piston 6 from continuing to push the vegetable oil to flow when it moves to the right. In this way, the flow rate of the high-viscosity vegetable oil in the oil circuit 3 is effectively accelerated, thereby improving the heat dissipation effect of the transformer;

[0037] An inclined groove 21 is provided at one end of the piston 6 away from the sealing cover 18. When the piston 6 moves to the right, the vegetable oil inside the oil circuit enters the oil guide groove 17 along the inclined groove 21, and the sealing cover 18 is pushed open. The setting of the inclined groove 21 is used to reduce the driving force of the vegetable oil inside the oil circuit when the piston 6 moves to the right, so that the vegetable oil can pass through the piston 6 smoothly.

[0038] Working principle: When in use, the reciprocating screw 7 is driven to rotate by starting the motor 15, thereby driving the slider 8 screwed on the outside of the reciprocating screw 7 to reciprocate left and right along the length direction of the reciprocating screw 7, thereby driving the connecting frame 4 fixedly connected to the slider 8 to move synchronously, and the connecting bar 16 connects multiple connecting frames 4, thereby driving multiple connecting frames 4 to reciprocate left and right synchronously. When the slider 8 and the connecting frame 4 move to the right, the transmission shaft 9 is driven to move synchronously, and the first one-way gear 10 is meshed with the rack 11 to drive the transmission shaft 9 to rotate, thereby driving the fan blades 5 to rotate synchronously, thereby leading out the hot air between the two heat sinks 1, thereby improving the continuous heat dissipation effect of the transformer. In this process, the brush roller 13 is driven to rotate through the meshing of the second one-way gear 14 and the rack 11, thereby cleaning the dust attached to the top of the heat sink 1 and cleaning it in the direction of the transmission shaft 9, and then when the fan blades 5 rotate to exhaust, the cleaned dust can be discharged accordingly, avoiding the problem of a large amount of dust attached to the outside of the heat sink 1 affecting its heat dissipation to the air;

[0039] When the connecting frame 4 moves left and right along the length direction of the heat sink 1, the energized electromagnet 19 is driven to move synchronously. In this process, when the electromagnet 19 is driven to move to the left, since the sealing cover 18 is installed on the left side of the piston 6, it can seal the piston 6, and then through the opposite attraction between the electromagnet 19 and the magnet ring 20, the piston 6 is driven to move to the left synchronously, thereby pushing the vegetable oil in the oil circuit 3 to move synchronously, and then a part of the vegetable oil in the oil circuit 3 that has been heat-dissipated by the heat sink 1 is sent to the oil tank inside the transformer, and at the same time, a part of the hot oil in the oil tank is supplemented into the oil circuit 3 through the suction force generated by the leftward movement of the piston 6. When the electromagnet 19 is driven to move to the right, the piston 6 moves synchronously, and the vegetable oil in the oil circuit 3 passes through the oil guide groove 17 to push open the sealing cover 18, thereby avoiding the piston 6 from continuing to push the vegetable oil to flow when it moves to the right. In this cycle, the flow speed of the high-viscosity vegetable oil inside the oil circuit 3 is effectively accelerated, thereby improving the heat dissipation effect of the transformer.

[0040] It should be noted that the device structure and drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in the field understand the principle of the above invention, the specific details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is to automatically control by a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in the field; the above only describes some exemplary embodiments of the present invention by way of explanation. Undoubtedly, for ordinary technicians in the field, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[0041] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc. are 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 referred device or element 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.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

Claims

1. A heat dissipation structure of a transformer for photovoltaic power generation, comprising a plurality of heat sinks (1), an oil inlet pipe (2) and an oil outlet pipe (23) respectively connected to the two ends of the heat sink (1), and a plurality of oil paths (3) respectively installed inside the plurality of heat sinks (1), wherein the two ends of the oil paths (3) are respectively connected to the oil inlet pipe (2) and the oil outlet pipe (23), and characterized in that: An auxiliary heat dissipation mechanism is provided between two adjacent heat dissipation fins (1) for discharging hot air between the two heat dissipation fins (1); The auxiliary heat dissipation mechanism comprises a connecting frame (4), a displacement component for driving the connecting frame (4) to move along the length direction of the heat sink (1), a fan blade (5) mounted on the connecting frame (4), and a linkage component for driving the fan blade (5) to rotate; An oil guide mechanism is provided between the connecting frame (4) and the oil circuit (3) to accelerate the flow rate of the high-viscosity vegetable oil in the oil circuit (3); The oil guide mechanism comprises a piston (6) installed inside the oil circuit (3) and a power assembly for driving the piston (6) to move; The displacement assembly comprises a guide rod (22) installed between two adjacent heat sinks (1) along the length direction of the heat sink (1) and a slider (8) slidably sleeved on the outside of the guide rod (22), and the connecting frame (4) is fixedly connected to the outer wall of the slider (8); A motor (15) is installed above one of the heat sinks (1), the output end of the motor (15) is connected to a reciprocating screw (7), one of the sliders (8) is screwed to the outside of the reciprocating screw (7), and a plurality of the connecting frames (4) are connected via connecting strips (16); The linkage assembly comprises a transmission shaft (9) rotatably connected between the slider (8) and the connecting frame (4) along the width direction of the heat sink (1), a first one-way gear (10) mounted outside the transmission shaft (9), and a rack (11) fixed to the outer wall of the heat sink (1) along the length direction thereof, wherein the first one-way gear (10) meshes with the rack (11); A through slot (12) is provided on the outer wall of the connecting frame (4), the fan blade (5) is located inside the through slot (12), the fan blade (5) is fixedly sleeved on the outside of the transmission shaft (9), the fan blade (5) is an exhaust fan, and a dust removal mechanism for cleaning the surface of the heat sink (1) is provided on one side of the transmission shaft (9).

2. The heat dissipation structure of a photovoltaic power generation transformer according to claim 1, characterized in that: The dust removal mechanism comprises a brush roller (13) connected to the inner wall of the connecting frame (4) and rotatable along the width direction of the heat sink (1), and a second one-way gear (14) connected to the input end of the brush roller (13), wherein the second one-way gear (14) is meshed with the rack (11).

3. The heat dissipation structure of a photovoltaic power generation transformer according to claim 2, characterized in that: An oil guide groove (17) is provided in the interior of the piston (6) along its axial direction, and a sealing cover (18) is hingedly connected to one end of the piston (6).

4. The heat dissipation structure of a photovoltaic power generation transformer according to claim 3, characterized in that: The power assembly comprises an electromagnet (19) mounted on the outer wall of the connecting frame (4) and a magnet ring (20) mounted inside the piston (6) along the axial direction thereof, wherein the electromagnet (19) is located directly above the magnet ring (20), and the electromagnet (19) cooperates with the magnet ring (20).

5. The heat dissipation structure of a photovoltaic power generation transformer according to claim 4, characterized in that: An inclined groove (21) is formed at one end of the piston (6) away from the sealing cover (18).

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