Transformer for photovoltaic booster station

Abstract

The invention discloses a transformer for a photovoltaic booster station, and belongs to the technical field of transformers. A heat dissipation pipeline is arranged in underground soil of the photovoltaic booster station, the heat dissipation pipeline communicates with heat conduction oil in a transformer shell, heat exchange is completed between the heat conduction oil in the transformer shell and the underground soil with the low temperature, the transformer is cooled, and the heat dissipation efficiency of the transformer is improved. According to the photovoltaic booster station transformer, the movable lifting structure is arranged below the transformer shell, the whole transformer can be freely moved and lifted through the movable lifting structure, free movement of the transformer is facilitated, and meanwhile the transformer is convenient and fast to install in the photovoltaic booster station.

Description

Technical Field

[0001] The present invention relates to a transformer for a photovoltaic booster station, belonging to the technical field of transformers. Background Art

[0002] A photovoltaic booster station is a place where the electric energy generated by photovoltaic modules is stepped up. Since the voltage of the electric energy generated by photovoltaic modules is relatively low, a large amount of energy will be lost if it is directly transmitted to the power grid. Therefore, it is necessary to boost the voltage to a level that meets the requirements of the power grid through a booster station. Therefore, the photovoltaic booster station is an indispensable part of photovoltaic power generation.

[0003] The transformer in a photovoltaic booster station is the core component that steps up the electric energy generated by photovoltaic modules to a high voltage that meets the requirements of the power grid. During the process of the transformer changing low voltage to high voltage, due to the existence of its own resistance in the transformer coil, a large amount of heat will be generated when current passes through. In order to dissipate the heat, the transformer casing is usually filled with heat-conducting oil, and then heat sinks are added outside the casing. Through the heat-conducting effect of the oil, the heat inside the transformer is dissipated through the heat sinks. However, this method has poor heat dissipation effect. At the same time, due to the small space inside the photovoltaic booster station, and most of the photovoltaic booster stations are built in places with sufficient sunlight, the temperature inside the booster station is relatively high, and the heat dissipation method through heat sinks is no longer applicable, often causing the transformer in the photovoltaic booster station to stop working due to high temperature, which affects the working efficiency of the transformer in the photovoltaic booster station.

[0004] In addition, transformers are generally relatively heavy, and most of the photovoltaic booster stations are built in areas with inconvenient roads. Large lifting equipment cannot enter or exit in places with narrow roads, resulting in extremely inconvenient handling and movement of the transformer during the installation process in the booster station. For this reason, some technicians in this field have developed a transformer for a photovoltaic booster station to overcome the problems in the above background art. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a transformer for a photovoltaic booster station aiming at the above deficiencies. The present invention can guide the heat-conducting oil in the transformer casing into the ground to complete heat exchange with the relatively low-temperature soil under the ground surface, improving the heat dissipation efficiency during the operation of the transformer. A moving and lifting structure is also provided on the lower surface of the transformer casing, making the installation of the transformer in the photovoltaic booster station convenient and fast.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A transformer for a photovoltaic step-up substation, comprising a housing. A winding is provided inside the housing, and the windings are arranged in a straight line and evenly. The inside of the windings is connected through an iron core. A terminal post is fixedly connected to the upper surface of the housing. An oil supply pipeline is provided above the housing, and an oil return pipeline is provided below the housing. A circulation pump and a heat dissipation pipeline are provided between the lower end of the oil supply pipeline and the lower end of the oil return pipeline. The circulation pump and the heat dissipation pipeline are located underground in the photovoltaic step-up substation. An oil supply valve is provided on the oil supply pipeline, a temperature sensor is provided on the oil return pipeline, and a mobile lifting structure is further provided on the lower surface of the housing.

[0007] Further, the mobile lifting structure includes support legs fixedly connected to the lower surface of the housing. Parallel plates are fixedly connected to the upper and lower parts of the support legs, and a lifting tapered wheel is further provided between the parallel plates.

[0008] Further, through holes are provided at the centers of the lifting tapered wheel and the parallel plates. A wheel shaft penetrates through the through holes of the lifting tapered wheel and the parallel plates. The outer surface of the wheel shaft and the inner surface of the lifting tapered wheel are engaged by threads, and a universal wheel is provided at the lower end of the wheel shaft.

[0009] Further, the mobile lifting structure further includes a cross plate fixedly connected to the lower surface of the housing. There are two cross plates arranged in parallel, and a driving column penetrates between the two ends of the cross plates.

[0010] Further, driving tapered wheels are fixedly connected to both ends of the driving column. An intermediate tapered wheel is further provided between the driving tapered wheels. The intermediate tapered wheel is fixedly connected to the surface of the driving column. The driving tapered wheel is engaged with the lifting tapered wheel, and a vertical plate is further fixedly connected between the cross plates.

[0011] Further, there are two vertical plates. A connecting shaft penetrates between the two vertical plates. Synchronous tapered wheels are fixedly connected to both ends of the connecting shaft. The synchronous tapered wheel is engaged with the intermediate tapered wheel, and a rocking component is further fixedly connected to the surface of the synchronous tapered wheel at one end of the connecting shaft.

[0012] Further, the rocking component includes a rocker fixedly connected to the surface of the synchronous tapered wheel. Rocker depressions are distributed on the surface of the end of the rocker, and a cylindrical pin and a spring are provided in the rocker depressions.

[0013] Further, a telescopic cylinder is further provided on the surface of the rocker. A rotating arm is fixedly connected to the surface of the end of the telescopic cylinder. Through holes are further provided on the barrel walls at both ends of the telescopic cylinder, and a locking column is further provided in the through holes of the telescopic cylinder.

[0014] The present invention adopts the above technical solutions. Compared with the prior art, it has the following technical effects: 1. A heat dissipation pipeline is provided in the underground soil of the photovoltaic step-up substation of the present invention. The heat dissipation pipeline is connected to the heat-conducting oil in the transformer housing. The heat-conducting oil in the heat dissipation pipeline exchanges heat with the underground soil with a lower temperature. By using the principle that the underground soil has a lower temperature and smaller fluctuations, the transformer is cooled, improving the cooling effect of the transformer.

[0015] 2. A mobile lifting structure is provided below the transformer housing of the present invention. The mobile lifting structure includes support legs fixedly connected to the lower surface of the housing. Parallel plates are fixedly connected to the upper and lower parts of the support legs. A lifting tapered wheel is also provided between the parallel plates. Through holes are provided at the centers of the lifting tapered wheel and the parallel plates. A wheel shaft passes through the through holes of the lifting tapered wheel and the parallel plates. The outer surface of the wheel shaft and the inner surface of the lifting tapered wheel are engaged by threads. A universal wheel is provided at the lower end of the wheel shaft. By rotating the lifting tapered wheel, the lifting of the wheel shaft within the parallel plates is achieved, thereby realizing the lifting of the entire transformer. By using the movement of the universal wheel, the free movement of the transformer is facilitated, and at the same time, it also makes the installation of the transformer in the photovoltaic step-up substation convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual ratio and orientation.

[0017] Figure 1 is a schematic diagram of the structural connection of the present invention; Figure 2 is a sectional view of the connection between the housing and the mobile lifting structure in the present invention; Figure 3 is a sectional view of the structural connection between the housing and the rocking assembly of the present invention.

[0018] In the figure: 1 - housing, 2 - terminal post, 3 - winding, 4 - oil supply pipeline, 5 - oil return pipeline, 6 - oil supply valve, 7 - temperature sensor, 8 - circulation pump, 9 - spring, 10 - heat dissipation pipeline, 11 - support leg, 12 - parallel plate, 13 - wheel shaft, 14 - universal wheel, 15 - lifting tapered wheel, 16 - cross plate, 17 - driving column, 18 - driving tapered wheel, 19 - vertical plate, 20 - connecting shaft, 21 - synchronous tapered wheel, 22 - intermediate tapered wheel, 23 - rocking assembly, 24 - rocker, 25 - locking column, 26 - telescopic cylinder, 27 - rotating arm, 28 - rocker depression, 29 - cylindrical pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] As Figure 1 and Figure 2As shown in the figure, a transformer for a photovoltaic step-up substation includes a housing 1. Inside the housing 1, there are three windings 3, which are arranged in a straight line and evenly. The windings 3 are connected to each other through an iron core inside. On the upper surface of the housing 1, there are a number of connection terminals 2, which are used for wiring between the windings 3 in the transformer and the low voltage and high voltage in the photovoltaic step-up substation. Above the housing 1, there is an oil supply pipeline 4, and below the housing 1, there is an oil return pipeline 5. Between the lower ends of the oil supply pipeline 4 and the oil return pipeline 5, there are a circulation pump 8 and a number of heat dissipation pipelines 10. The circulation pump 8 and the heat dissipation pipelines 10 are located underground under the surface of the photovoltaic step-up substation. On the oil supply pipeline 4, there is an oil supply valve 6, and on the oil return pipeline 5, there is a temperature sensor 7. On the lower surface of the housing 1, there is also a mobile lifting structure.

[0020] The mobile lifting structure includes four support legs 11, which are fixedly connected to the lower surface of the housing 1. Parallel plates 12 are fixedly connected to the upper and lower parts of the support legs 11. Between the parallel plates 12, there is also a lifting tapered wheel 15. There are through holes at the centers of the lifting tapered wheel 15 and the parallel plates 12. A wheel shaft 13 passes through the through holes of the lifting tapered wheel 15 and the parallel plates 12. The outer surface of the wheel shaft 13 is meshed with the inner surface of the lifting tapered wheel 15 through threads. At the lower end of the wheel shaft 13, there is a universal wheel 14.

[0021] The mobile lifting structure also includes a cross plate 16, which is fixedly connected to the lower surface of the housing 1. There are two cross plates 16, which are arranged in parallel. A driving column 17 passes through between the two ends of the cross plate 16. Driving tapered wheels 18 are fixedly connected to both ends of the driving column 17. Between the driving tapered wheels 18, there is also an intermediate tapered wheel 22, which is fixedly connected to the surface of the driving column 17. The driving tapered wheels 18 are meshed with the lifting tapered wheels 15.

[0022] Between the cross plates 16, there are also two vertical plates 19 fixedly connected. A connecting shaft 20 passes through between the two vertical plates 19. Synchronous tapered wheels 21 are fixedly connected to both ends of the connecting shaft 20. The synchronous tapered wheels 21 are meshed with the intermediate tapered wheel 22. On the surface of one of the synchronous tapered wheels 21 at one end of the connecting shaft 20, there is also a rocking component 23 fixedly connected.

[0023] As Figure 3 As shown in the figure, the rocking component 23 includes a rocker 24, which is fixedly connected to the surface of the synchronous tapered wheel 21. On the end surface of the rocker 24, there are two rocker recesses 28 distributed symmetrically. Inside the rocker recesses 28, there are a cylindrical pin 29 and a spring 9.

[0024] The surface of the rocker 24 is also provided with a telescopic cylinder 26. The end surface of the telescopic cylinder 26 is fixedly connected with a rotating arm 27. There are two rotating arms 27, which are symmetrically distributed on the end surface of the telescopic cylinder 26. Through holes are also provided on the barrel walls at both ends of the telescopic cylinder 26, and the diameter of the through hole on one side of the inner surface of the telescopic cylinder 26 is larger than the diameter of the through hole on one side of the outer surface of the telescopic cylinder 26. A locking column 25 is also provided in the through hole of the telescopic cylinder 26. The diameter of the middle part of the locking column 25 is slightly smaller than the diameters at both ends. Usually, under the elastic action of the spring 9, the locking column 25 on the surface of the cylindrical pin 29 pushes the cylindrical pin 29 into the through hole of the telescopic cylinder 26, and the locking column 25 exposes the outer surface of the telescopic cylinder 26. The cylindrical pin 29 locks the telescopic cylinder 26 to prevent the telescopic cylinder 26 from rotating on the surface of the rocker 24 and also prevent the telescopic cylinder 26 from extending out from below the housing 1. The operator presses the locking column 25 exposed on the outer surface of the telescopic cylinder 26 into the through hole of the telescopic cylinder 26, the cylindrical pin 29 retracts into the recess 28 of the rocker, the cylindrical pin 29 disengages from the inner wall of the telescopic cylinder 26, and the telescopic cylinder 26 is released. At the same time, the operator pulls out the rotating arm 27 and the telescopic cylinder 26 from below the housing 1.

[0025] During the process of the telescopic cylinder 26 extending out from below the housing 1, when the cylindrical pin 29 passes through the surface of the locking column 25 at the other end of the telescopic cylinder 26, due to the action of the spring 9, the locking column 25 at the other end is pushed out of the outer surface of the telescopic cylinder 26, and the cylindrical pin 29 enters into the through hole at the other end of the telescopic cylinder 26 again. The cylindrical pin 29 locks the telescopic cylinder 26 again. The operator holds the rotating arm 27 tightly and then rotates it in a certain direction. The rocker 24 and the telescopic cylinder 26 rotate, and the connecting shaft 20 and the synchronous conical wheels 21 at both ends thereof also rotate following the rocker 24. The intermediate conical wheel 22 meshing with the synchronous conical wheel 21 rotates following the synchronous conical wheel 21. The synchronous conical wheel 21 rotates to drive the driving column 17 and the driving conical wheel 18 to rotate. Then, the lifting conical wheel 15 meshing with the driving conical wheel 18 rotates following the driving conical wheel 18.

[0026] The rotation of the lifting conical wheel 15 drives the rotation of the wheel shaft 13 meshing through a thread inside the lifting conical wheel 15. Since the lifting conical wheel 15 is located between the parallel plates 12 and cannot move up and down, according to the principle of action and reaction, the wheel shaft 13 descends in the through hole of the parallel plates 12 to lift the transformer housing 1 to a certain height. The operator pushes the transformer to a designated location in the booster station for installation.

[0027] When the transformer is moved to the designated location in the booster station, the operator rotates the rotating arm 27 in the reverse direction and repeats the above work process of moving the lifting structure in the reverse direction. The wheel axle 13 rises in the through hole of the parallel plate 12, and the transformer housing 1 descends to a certain height. Then, the operator fixes the housing 1 to the installation channel steel below. Subsequently, the operator pinches the locking column 25 on the surface of the cylindrical pin 29 and presses the cylindrical pin 29 into the rocker recess 28. The cylindrical pin 29 disengages from the inner wall of the telescopic cylinder 26, releasing the telescopic cylinder 26. At the same time, the operator pushes the rotating arm 27 and the telescopic cylinder 26 under the housing 1 to reset.

[0028] Through the moving lifting structure, the operator can freely lift the transformer by a certain height in four directions at the same time, making the overall movement of the transformer more convenient and fast during the installation process in the photovoltaic booster station.

[0029] After the transformer housing 1 is fixedly installed, the operator connects the oil supply pipeline 4 and the oil return pipeline 5 to the housing 1, opens the oil supply valve 6, and starts the circulation pump 8. The heat-conducting oil in the housing 1 flows between the oil supply pipeline 4 and the oil return pipeline 5, and the heat generated in the transformer is released into the soil with a lower temperature through the heat dissipation pipeline 10, which can quickly dissipate the heat of the transformer and cool it down. The temperature sensor 7 is used to detect the temperature of the circulating heat-conducting oil in the oil return pipeline 5.

[0030] The description of the present invention is given for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A transformer for a photovoltaic step-up substation, characterized in that: The invention comprises a shell (1), wherein windings (3) are arranged in a straight line and in a balanced manner, wherein the windings (3) are connected to each other through an iron core, wherein a terminal (2) is fixedly connected to the upper surface of the shell (1), wherein an oil supply pipeline (4) is arranged at the upper part of the shell (1), wherein an oil return pipeline (5) is arranged at the lower part of the shell (1), wherein a circulation pump (8) and a heat dissipation pipeline (10) are arranged between the lower end of the oil supply pipeline (4) and the lower end of the oil return pipeline (5), wherein the circulation pump (8) and the heat dissipation pipeline (10) are located under the surface of the photovoltaic booster station, wherein an oil supply valve (6) is arranged on the oil supply pipeline (4), wherein a temperature sensor (7) is arranged on the oil return pipeline (5), and wherein a movable lifting structure is also arranged on the lower surface of the shell (1).

2. The transformer for a photovoltaic booster station according to claim 1, wherein: The mobile lifting structure comprises a support leg (11), the support leg (11) being fixedly connected to the lower surface of the housing (1), the upper and lower parts of the support leg (11) being fixedly connected to parallel plates (12), and a lifting conical wheel (15) being provided between the parallel plates (12).

3. The transformer for a photovoltaic booster station according to claim 2, wherein: A through hole is provided at the center of the lifting cone wheel (15) and the parallel plate (12), a wheel shaft (13) passes through the through hole of the lifting cone wheel (15) and the parallel plate (12), the outer surface of the wheel shaft (13) and the inner surface of the lifting cone wheel (15) are engaged with each other through a thread, and a universal wheel (14) is provided at the lower end of the wheel shaft (13).

4. The transformer for a photovoltaic step-up substation according to claim 2, characterized in that: The movable lifting structure further comprises a transverse plate (16), the transverse plate (16) being fixedly connected to the lower surface of the housing (1), and having two transverse plates (16) arranged in parallel, with a driving column (17) passing through between the two ends of the transverse plates (16).

5. The transformer for a photovoltaic step-up substation according to claim 4, characterized in that: The driving column (17) has driving conical wheels (18) fixedly connected at both ends, and an intermediate conical wheel (22) is provided between the driving conical wheels (18). The intermediate conical wheel (22) is fixedly connected to the surface of the driving column (17). The driving conical wheel (18) is meshed with the lifting conical wheel (15). A vertical plate (19) is also fixedly connected between the horizontal plates (16).

6. The transformer for a photovoltaic step-up substation according to claim 5, characterized in that: There are two vertical plates (19), a connecting shaft (20) passes through the vertical plates (19), both ends of the connecting shaft (20) are fixedly connected with synchronous conical wheels (21), the synchronous conical wheels (21) and the intermediate conical wheels (22) are meshed, and a shaking assembly (23) is also fixedly connected to the surface of the synchronous conical wheel (21) at one end of the connecting shaft (20).

7. The transformer for a photovoltaic step-up substation according to claim 6, wherein: The rocking assembly (23) comprises a rocking arm (24), the rocking arm (24) being fixedly connected to the surface of the synchronous conical wheel (21), a rocking arm recess (28) being provided on the surface of the end of the rocking arm (24), and a cylindrical pin (29) and a spring (9) being provided in the rocking arm recess (28).

8. The transformer for a photovoltaic step-up substation according to claim 7, wherein: A telescopic cylinder (26) is also provided on the surface of the rocker (24), a rotating arm (27) is fixedly connected to the surface of the end of the telescopic cylinder (26), through holes are also provided on the cylinder walls at both ends of the telescopic cylinder (26), and a locking column (25) is also provided in the through hole of the telescopic cylinder (26).

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