Energy-saving oil-immersed transformer

Abstract

The present application relates to the field of transformer equipment, especially to an energy-saving oil-immersed transformer. The technical scheme comprises an oil-immersed transformer body, oil liquid arranged in the oil-immersed transformer body, a plurality of cooling mechanisms arranged in the oil-immersed transformer body, a refrigeration device arranged on one side of the oil-immersed transformer body, and a conveying pipeline system. The cooling mechanisms are used for heat exchange of the upper high-temperature part of the oil liquid and conveying of the lower low-temperature part of the oil liquid. The refrigeration device provides refrigerant medium to the cooling mechanisms through the conveying pipeline system, so as to increase the temperature difference between the inside and outside of the cooling mechanisms. The present application provides cold air to the cavity formed by the guide assembly and the oil distribution pipeline, so as to maintain the temperature difference between the two sides of the temperature difference power generation sheet, accelerate the heat dissipation of the lower half of the oil distribution pipeline, and achieve heat recovery while rapid cooling.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformer equipment, and in particular to an energy-saving oil-immersed transformer. BACKGROUND

[0002] A transformer can be divided into an oil-immersed transformer and a dry-type transformer. In order to strengthen insulation and cooling conditions, the iron core and winding of the transformer are immersed in an oil tank filled with transformer oil. In special cases, such as in street lamps and mine lighting, dry-type transformers are also used.

[0003] An oil-immersed transformer is an important device in a power system for changing voltage and transmitting electric energy, and is the basis for safe and economic operation of the power grid. The oil-immersed transformer mainly works according to the principle of electromagnetic induction. On the closed iron core, two mutually insulated windings are wound, of which the side connected to the power supply is called the primary winding, and the side outputting electric energy is called the secondary winding. When the alternating current power supply voltage is applied to the primary side winding, an alternating current flows through the winding, generating an alternating magnetic flux in the iron core. This alternating magnetic flux not only passes through the primary side winding, but also passes through the secondary side winding, generating induced voltages E1 and E2 in the two windings, respectively. At this time, if the secondary side winding is connected to the load of the external circuit, current will flow into the load, i.e. the secondary side winding has electric energy output.

[0004] The components of an oil-immersed transformer include the body (iron core, winding, insulation, lead), oil-immersed transformer oil, oil tank and cooling device, voltage regulating device, protection device (hygrostat, safety air duct, gas relay, oil storage tank and temperature measuring device, etc.) and outlet bushing.

[0005] It adopts a fully sealed structure, and the oil-immersed transformer oil is isolated from the air, slowing down the change of the oil. In the case of severe overload, the coil insulation will not age and be thermally broken, maintaining excellent electrical and mechanical properties during use.

[0006] The patent application No. 202111191586.0 discloses an energy-saving oil-immersed transformer device. Specifically, it sucks the external air into the inside of the air pipe from one end of the air pipe and discharges it from the other end, so that the external air flows through the inside of the air pipe. When the external air flows through the air pipe, it can take out the heat in the oil tank with the oil, so as to achieve heat dissipation of the oil.

[0007] As known to those skilled in the art, the temperature of the upper oil in the oil-immersed transformer during operation is as high as 85℃, and the maximum temperature does not exceed 95℃. In summer, the outdoor temperature is as high as 30℃ or more. It is difficult to reduce the temperature of the oil by relying only on heat exchange with external gas, and it is impossible to recycle the heat as warning electric power. SUMMARY

[0008] The present application aims at the problems in the background art, and provides an energy-saving oil-immersed transformer with heat recovery and efficient oil cooling.

[0009] The technical scheme of the present application is an energy-saving oil-immersed transformer, comprising an oil-immersed transformer body, oil liquid arranged in the oil-immersed transformer body, and further comprising:

[0010] A plurality of cooling mechanisms are arranged in the side wall of the oil-immersed transformer body, and the cooling mechanisms are used to exchange heat between the upper high-temperature part of the oil liquid and the lower low-temperature part of the oil liquid.

[0011] A refrigeration device is installed on one side of the oil-immersed transformer body through a mounting bracket.

[0012] The refrigeration device provides refrigerant medium to the plurality of cooling mechanisms through a delivery pipeline system, so as to increase the temperature difference between the inside and outside of the cooling mechanism.

[0013] Preferably, the cooling mechanism comprises a high-temperature oil inlet pipeline connected to the upper cavity of the oil-immersed transformer body and a low-temperature oil outlet pipeline connected to the lower cavity of the oil-immersed transformer body, and a plurality of oil distribution pipelines are arranged between the high-temperature oil inlet pipeline and the low-temperature oil outlet pipeline.

[0014] The cross section of each oil distribution pipeline is in the shape of a hollow semicircle, which is used to connect the high-temperature oil inlet pipeline and the low-temperature oil outlet pipeline while uniformly distributing the oil liquid flowing through the high-temperature oil inlet pipeline.

[0015] Preferably, the side of the high-temperature oil inlet pipeline and the low-temperature oil outlet pipeline close to each other is in the shape of a funnel, and the centers of the funnels are on the same vertical axis, and a plurality of oil distribution pipelines are uniformly distributed between the high-temperature oil inlet pipeline and the low-temperature oil outlet pipeline with the axis as the center.

[0016] Preferably, a flow guide assembly is fixed to the flat surface part of each oil distribution pipeline, and a plurality of oil distribution pipelines are kept in a fixed state through a support disc.

[0017] The cooling mechanism further comprises a distribution disc arranged on the inner side of the plurality of oil distribution pipelines, and the distribution disc is used to be connected to the delivery pipeline system.

[0018] A plurality of connecting pipelines are further arranged on the distribution disc, and the plurality of connecting pipelines and the plurality of flow guide assembly bottoms one-to-one correspond to each other.

[0019] Preferably, a plurality of rectangular mounting grooves are arranged on the flat surface of the oil distribution pipeline along the axial direction, and a thermoelectric power generation sheet is arranged in each mounting groove.

[0020] The upper surface of the support disc is provided with an induction lighting device, and the lower surface of the support disc is fixed with an energy storage device;

[0021] The plurality of thermoelectric generating sheets are connected in series to supply power to the energy storage device, and the energy storage device supplies power to the induction lighting device after storing electric energy.

[0022] Preferably, the flow guide assembly comprises a flow guide shell fixed with the oil distribution pipeline flat surface, the top of the flow guide shell is provided with an air outlet facing the induction lighting device, and the side surface of the flow guide shell is provided with a wire hole for the thermoelectric generating sheet wire to pass out.

[0023] Preferably, the oil-immersed transformer body comprises a transformer shell and a plurality of groups of iron core winding structures arranged in the transformer shell.

[0024] One side of the transformer shell is mounted with an oil pillow through a support, and the oil pillow is communicated with the transformer shell through an oil supplement pipeline.

[0025] The oil pillow is also connected with a breather through a pipeline.

[0026] Preferably, the transformer shell is fixed with a mounting base at the bottom, and the transformer shell is provided with an oil outlet at the side surface.

[0027] Preferably, the upper half of the oil distribution pipeline is made of iron material, and the lower half of the oil distribution pipeline is made of copper material.

[0028] Preferably, the lower half of the oil distribution pipeline is provided with a heat dissipation fin on the arc surface.

[0029] Compared with the prior art, the present application has the following beneficial technical effects:

[0030] The present application provides cold air to the distribution disc through the blowing function of the refrigeration equipment and the conveying pipeline system after refrigeration, and the cold air enters the cavity formed by the flow guide assembly and the oil distribution pipeline in sequence through the connecting pipeline, on the one hand, the temperature difference between the two sides of the thermoelectric generating sheet is maintained, and on the other hand, the heat dissipation of the lower half of the oil distribution pipeline is accelerated, so that rapid cooling and heat recovery are realized at the same time, and the recovered electric energy is used for storage and warning. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 The structure schematic diagram of one embodiment of the present application is given;

[0033] Figure 2 It is the schematic diagram of internal structure of the present application;

[0034] Figure 3 It is the schematic diagram of structure of cooling mechanism in the present application;

[0035] Figure 4 It is the schematic diagram of part structure of cooling mechanism in the present application;

[0036] Figure 5 It is the schematic diagram of explosion structure of flow guide assembly in the present application;

[0037] Reference signs: 100 oil-immersed transformer main body; 110 oil pillow; 120 transformer shell; 130 mounting base; 140 iron core winding structure; 150 oil outlet; 160 mounting rack; 170 oil; 180;

[0038] 200 refrigeration equipment;

[0039] 300 conveying pipeline system;

[0040] 400 cooling mechanism; 410 high-temperature oil inlet pipeline; 420 low-temperature oil outlet pipeline; 430 oil distribution pipeline; 440 flow guide assembly; 450 connecting pipeline; 460 supporting disc; 470 energy storage device; 480 induction lighting device; 490 flow distribution disc;

[0041] 441 air outlet; 442 flow guide shell; 443 wire hole; 445 thermoelectric power generation sheet. DETAILED DESCRIPTION

[0042] The technical solutions of the present application are further described below in combination with the drawings and specific embodiments.

[0043] EMBODIMENT

[0044] As shown in Figure 1 and Figure 2 An energy-saving oil-immersed transformer is provided by the present application, which comprises an oil-immersed transformer main body 100 and oil 170 arranged in the oil-immersed transformer main body 100, wherein the oil-immersed transformer main body 100 comprises a transformer shell 120 and multiple groups of iron core winding structures 140 arranged inside the transformer shell 120;

[0045] An oil pillow 110 is mounted on one side of the transformer shell 120 through a support, and the oil pillow 110 is in communication with the transformer shell 120 through an oil supplement pipeline; the volume of oil in the oil pillow 110 is 10% of the volume of oil in the transformer shell 120, which is used to supplement oil in the transformer shell 120 to ensure the balance of oil in the transformer shell 120;

[0046] The oil pillow 110 is also connected with a breather through a pipeline, which is composed of a pipeline and a glass container, and contains a drying agent (silica gel or activated alumina) for avoiding external moisture from entering the oil pillow 110.

[0047] The bottom of the transformer shell 120 is fixed with a mounting base 130, and the side of the transformer shell 120 is provided with an oil outlet 150. The mounting base 130 is used for supporting and mounting the oil-immersed transformer body 100, and the oil outlet 150 is used for discharging oil in the transformer shell 120.

[0048] Also comprising:

[0049] The cooling mechanism 400 is provided with a plurality of cooling mechanisms 400, which are arranged in the side wall of the oil-immersed transformer body 100 in sequence, and the cooling mechanism 400 is used for heat exchange of the upper layer of the oil 170 and then transported to the lower layer of the oil 170; the energy of the heat exchange is used for power generation and storage.

[0050] The refrigeration equipment 200 is installed on one side of the oil-immersed transformer body 100 through the mounting bracket 160; the refrigeration equipment 200 is used as refrigeration equipment, which has the functions of refrigeration and blowing;

[0051] The conveying pipeline system 300 provides refrigerant medium to the plurality of cooling mechanisms 400 through the refrigeration equipment 200, so as to increase the internal and external temperature difference of the cooling mechanism 400; through the blowing function of the refrigeration equipment 200 and the refrigerant medium provided by the conveying pipeline system 300 to the cooling mechanism 400, the refrigerant medium in this embodiment is the refrigerated air.

[0052] As shown in Figures 3-4 The cooling mechanism 400 includes a high-temperature oil inlet pipeline 410 connected with the upper cavity of the oil-immersed transformer body 100 and a low-temperature oil outlet pipeline 420 connected with the lower cavity of the oil-immersed transformer body 100, and it should be noted that the tubular part of the high-temperature oil inlet pipeline 410 and the low-temperature oil outlet pipeline 420 is bent (not shown in the figure), and then connected with the transformer shell 120, and a plurality of oil distribution pipelines 430 are arranged between the high-temperature oil inlet pipeline 410 and the low-temperature oil outlet pipeline 420.

[0053] Each oil distribution pipeline 430 has a hollow semicircular cylindrical cross section, which is used for connecting the high-temperature oil inlet pipeline 410 and the low-temperature oil outlet pipeline 420 and uniformly distributing the oil 170 flowing through the high-temperature oil inlet pipeline 410.

[0054] The high-temperature oil inlet pipe 410 and the low-temperature oil outlet pipe 420 are both funnel-shaped on their adjacent sides, and their centers are on the same vertical axis. Multiple branch pipes 430 are evenly distributed between the high-temperature oil inlet pipe 410 and the low-temperature oil outlet pipe 420 with this axis as their center. In this embodiment, the arc-shaped surface of the branch pipe 430 faces outward, and the straight surface faces the direction of the axis.

[0055] Each oil distribution pipeline 430 has a flow guiding component 440 fixed on its straight surface. Multiple oil distribution pipelines 430 are kept in a fixed state by a support plate 460. The support plate 460 is used to connect the flow guiding component 440 to increase stability, and also serves as a load-bearing platform to improve the integration of the device.

[0056] The cooling mechanism 400 also includes a distribution plate 490 disposed inside the multiple oil distribution pipelines 430, the distribution plate 490 being used to connect to the delivery pipeline system 300;

[0057] The distribution plate 490 is also equipped with multiple connecting pipes 450, which are connected to the bottom of multiple flow guiding components 440 one by one. The distribution plate 490 is cylindrical and drum-shaped, which evenly distributes the cold air delivered by the delivery pipeline system 300. After distribution, the air is sequentially delivered to the cavity between the flow guiding component 440 and the oil distribution pipeline 430 through the connecting pipes 450.

[0058] Combination Figure 5 As shown, the straight surface of the oil distribution pipeline 430 is provided with multiple rectangular mounting slots along its axial direction, and each mounting slot is provided with a thermoelectric generator 445. The gap between the thermoelectric generator 445 and the oil distribution pipeline 430 is sealed with a sealing gasket. The thermoelectric generator 445 generates electricity by utilizing the temperature difference between the high-temperature oil inside the oil distribution pipeline 430 and the cold air delivered to the inside of the flow guide assembly 440. When the temperature difference exceeds 60°C, the generated voltage can reach 3.5V and the current can reach 3-5A.

[0059] An induction lighting device 480 is provided on the upper surface of the support plate 460, and an energy storage device 470 is fixed on the lower surface of the support plate 460.

[0060] Multiple thermoelectric generators 445 are connected in series to supply power to the energy storage device 470. The energy storage device 470 stores electrical energy and then supplies power to the sensor-activated lighting device 480. The series connection of the thermoelectric generators 445 results in higher power generation, which can charge the energy storage device 470. When the light sensor in the sensor-activated lighting device 480 detects a change in the light signal (i.e., when the light intensity is low at night), the energy storage device 470 supplies power to the sensor-activated lighting device 480, causing it to emit light as a warning.

[0061] The flow guiding assembly 440 includes a flow guiding housing 442 fixed to the flat surface of the oil distribution pipeline 430. The top of the flow guiding housing 442 is provided with an air outlet 441 facing the induction lighting device 480, and the side of the flow guiding housing 442 is provided with a wire hole 443 for the wire of the thermoelectric generator 445 to pass through.

[0062] After the cold air increases the temperature difference between the two sides of the thermoelectric generator 445 through the air guide component 440, the remaining cold air is blown to the sensor lighting device 480 through the air outlet 441 to cool the sensor lighting device 480 and extend its service life.

[0063] The upper part of the oil distribution pipe 430 is made of iron, while the lower part is made of copper. Iron has a thermal conductivity of 76.2, which is relatively poor, and is used to maintain a large temperature difference between the two sides of the thermoelectric generator 445 to ensure effective thermoelectric power generation. Copper has a thermal conductivity of 393.5, which is strong, so when some cold air blows onto the copper, it can quickly exchange heat, achieving rapid heat dissipation.

[0064] The lower half of the oil distribution pipe 430 has heat dissipation fins on its curved surface. The heat dissipation fins further accelerate the heat dissipation rate of the lower half of the oil distribution pipe 430.

[0065] The working principle of an energy-saving oil-immersed transformer based on the embodiment is as follows: the cooling equipment 200 provides cold air to the distribution plate 490 through its cooling and blowing function and the conveying pipeline system 300. The cold air then enters the cavity formed by the flow guiding component 440 and the oil distribution pipeline 430 through the connecting pipeline 450. On the one hand, it maintains the temperature difference on both sides of the thermoelectric generator 445, and on the other hand, it accelerates the heat dissipation of the lower half of the oil distribution pipeline 430, thereby achieving rapid cooling while recovering heat. The recovered electrical energy is used for storage and warning conversion.

[0066] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] The above specific embodiments are merely one or more preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An energy saving oil immersed transformer comprising an oil immersed transformer body (100) and an oil (170) disposed within the oil immersed transformer body (100), characterized in that: Also include: Cooling mechanism (400), the cooling mechanism (400) is provided with multiple, multiple cooling mechanism (400) is arranged in turn in the side wall of oil-immersed transformer body (100), the cooling mechanism (400) is used to cold heat exchange after the upper layer high temperature part of oil liquid (170) is transported to the lower layer low temperature part of oil liquid (170); Refrigeration equipment (200), the refrigeration equipment (200) is installed on one side of oil-immersed transformer body (100) through mounting bracket (160); Delivery pipeline system (300), the refrigeration equipment (200) provides refrigerant medium to multiple cooling mechanism (400) through delivery pipeline system (300), for increasing the internal and external temperature difference of cooling mechanism (400); The cooling mechanism (400) includes high-temperature oil inlet pipeline (410) connected with the upper cavity of oil-immersed transformer body (100) and low-temperature oil outlet pipeline (420) connected with the lower cavity of oil-immersed transformer body (100), multiple oil distribution pipelines (430) are arranged between high-temperature oil inlet pipeline (410) and low-temperature oil outlet pipeline (420); The cross section of each oil distribution pipeline (430) is hollow semicylindrical, which is used to communicate high-temperature oil inlet pipeline (410) and low-temperature oil outlet pipeline (420) while uniformly distributing the oil liquid (170) flowing through high-temperature oil inlet pipeline (410); The side of high-temperature oil inlet pipeline (410) and low-temperature oil outlet pipeline (420) close to each other is funnel-shaped, and the centers of the funnels are on the same vertical axis, and multiple oil distribution pipelines (430) are uniformly distributed between high-temperature oil inlet pipeline (410) and low-temperature oil outlet pipeline (420) with the axis as the center; The flat surface part of each oil distribution pipeline (430) is fixed with a flow guide assembly (440), and multiple oil distribution pipelines (430) are kept in a fixed state by a support disc (460); The cooling mechanism (400) further includes a flow distribution disc (490) arranged inside multiple oil distribution pipelines (430), and the flow distribution disc (490) is used to be connected with the delivery pipeline system (300); The flow distribution disc (490) is further provided with multiple connecting pipelines (450), and multiple connecting pipelines (450) and multiple flow guide assemblies (440) at the bottom one by one correspond to communicate; The flat surface of the oil distribution pipeline (430) is provided with multiple rectangular mounting grooves in the axial direction, and each mounting groove is provided with a thermoelectric power generation sheet (445); The upper surface of the support disc (460) is provided with an induction lighting device (480), and the lower surface of the support disc (460) is fixed with an energy storage device (470); Multiple thermoelectric power generation sheets (445) are connected in series to supply power to the energy storage device (470), and the energy storage device (470) stores electrical energy to supply power to the induction lighting device (480); The flow guide assembly (440) includes a flow guide shell (442) fixed with the oil distribution pipeline (430) in a flat surface, the top of the flow guide shell (442) is provided with an air outlet (441) towards the induction lighting device (480), and the side of the flow guide shell (442) is provided with a wire hole (443) for the wire of the thermoelectric power sheet (445) to pass out.

2. An energy saving oil immersed transformer as claimed in claim 1, wherein, The oil-immersed transformer body (100) comprises a transformer shell (120) and a plurality of groups of core winding structures (140) arranged inside the transformer shell (120). An oil pillow (110) is mounted on one side of the transformer shell (120) through a support, and the oil pillow (110) is communicated with the transformer shell (120) through an oil supplement pipeline. The oil pillow (110) is further connected with a breather through a pipeline.

3. An energy saving oil immersed transformer as claimed in claim 2, wherein, An installation base (130) is fixed to the bottom of the transformer shell (120), and an oil outlet (150) is arranged on the side of the transformer shell (120).

4. An energy saving oil immersed transformer as claimed in claim 1, wherein, The upper half of the oil distribution pipeline (430) is made of iron material, and the lower half of the oil distribution pipeline (430) is made of copper material.

5. An energy saving oil immersed transformer as claimed in claim 4, wherein, The lower half of the oil distribution pipeline (430) is provided with heat dissipation fins on the arc surface.

Images