An oil-immersed transformer

Abstract

An oil-immersed transformer comprises a transformer body and an oil reservoir arranged on the transformer body and communicated with the transformer body, the oil reservoir is communicated with the inside of the transformer body through a hard oil delivery pipe and an oil inlet pipe, a heat dissipation unit is arranged in the oil reservoir, the heat dissipation unit comprises a rotating hollow shaft and stirring shunt pipe fittings, one end of the rotating hollow shaft is rotatably connected with the end of the oil inlet pipe extending into the oil reservoir through a pipe connector, the other end of the rotating hollow shaft penetrates out of the oil reservoir, a wind-driven mechanism connected with the rotating hollow shaft is arranged outside the oil reservoir, the rotating hollow shaft is rotatably connected with the oil reservoir and is located below the liquid level of the transformer oil in the oil reservoir, and the stirring shunt pipe fittings comprise a plurality of hollow stirring shunt pipes. The wind-driven mechanism can drive the rotating hollow shaft to rotate, and then drive the plurality of stirring shunt pipes to stir the transformer oil in the oil reservoir, so as to achieve the effect of convection heat dissipation of the transformer oil, and the stirring shunt pipes not only can transport the transformer oil, but also can throw the transformer oil heated in the transformer body into the oil reservoir.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to an oil-immersed transformer. BACKGROUND

[0002] The oil-immersed transformer is a type of transformer widely used in power systems, which is filled with transformer oil for cooling and insulation. The oil conservator (also known as the oil storage tank or expansion tank) is an important component of the oil-immersed transformer, which is used to adjust the volume change of the transformer oil and prevent the oil in the tank from overflowing or generating negative pressure due to temperature changes.

[0003] The oil conservator of the prior art is connected to the tank of the oil-immersed transformer through the oil delivery pipe and the oil inlet pipe. For the oil-immersed transformer installed outdoors, a heat-conducting frame is provided inside the oil conservator, which is connected to the shell of the oil conservator and the heat dissipation mechanism outside the oil conservator shell, and serves to dissipate heat for the transformer oil inside the oil conservator. However, the heat dissipation area of the oil conservator is small and the effect is limited, as the heat dissipation is only through the fixed-position heat-conducting frame inside the oil conservator, which can easily cause local overheating inside the oil conservator, accelerating the oxidation process of the transformer oil and reducing its insulation performance.

[0004] The oil inlet pipe of the prior art is provided with a filter screen for filtering impurities such as mechanical wear, residues during installation, metal chips during maintenance, etc. However, the filter screen is arranged at the pipe opening of the oil inlet pipe with a small cross-sectional area, which not only has a small filtering area and is prone to blockage, but also increases the resistance of the transformer oil passing through, resulting in an increase in local pressure drop, an increase in flow velocity before the filter screen, which can cause turbulent flow of the transformer oil and increase energy loss, and a decrease in flow velocity after the filter screen, which can cause uneven flow of the transformer oil in the pipeline and affect the circulation of the transformer oil. SUMMARY

[0005] To solve the technical problems in the background art, the present application provides an oil-immersed transformer.

[0006] The technical scheme of the present application is as follows:

[0007] An oil-immersed transformer, comprising a transformer body and an oil conservator arranged on and connected to the transformer body, the oil conservator being connected to the inside of the transformer body through a hard oil delivery pipe and an oil inlet pipe, and a heat dissipation unit being arranged inside the oil conservator, the heat dissipation unit comprising a rotating hollow shaft and a stirring shunt pipe arranged thereon, the axis of the rotating hollow shaft being consistent with the length direction of the oil conservator, one end of the rotating hollow shaft being rotatably connected to the end of the oil inlet pipe extending into the oil conservator through a pipe connector, and the other end of the rotating hollow shaft extending out of the oil conservator, a wind-driven mechanism being arranged outside the oil conservator and connected to the rotating hollow shaft, and the rotating hollow shaft being rotatably connected to the oil conservator.

[0008] The stirring shunt pipe comprises a plurality of hollow stirring shunt pipes arranged along the length direction of the rotating hollow shaft and in communication with the rotating hollow shaft.

[0009] The pipeline connector comprises a first sleeve in sealing connection with one end of the oil inlet pipe and a second sleeve sleeved in the first sleeve, the second sleeve is in rotational connection with the first sleeve, the second sleeve is in sealing connection with the end of the rotating hollow shaft away from the one end of the oil inlet pipe, and the inner diameter of the second sleeve is larger than the inner diameter of the oil inlet pipe.

[0010] In order to improve the filtering effect on the transformer oil, a first filtering assembly is arranged at the end of the stirring shunt pipe away from the rotating hollow shaft, the first filtering assembly comprises an arc-shaped filter screen, by arranging the first filtering assembly on each stirring shunt pipe, the filtering area of the transformer oil can be increased, and the mesh size of the auxiliary filter screen can be increased, thereby reducing the influence on the flow rate of the transformer oil.

[0011] The wind driving mechanism can drive the rotating hollow shaft to rotate, and then drive the plurality of stirring shunt pipes to stir the transformer oil in the oil pillow, thereby achieving the effect of heat dissipation of the transformer oil convection; the stirring shunt pipe can not only play a role in conveying the transformer oil, but also can throw the transformer oil heated in the transformer body into the oil pillow, the transformer oil contacts the inner wall of the oil pillow, and the heat of the transformer oil is quickly conducted outward through the shell of the oil pillow, thereby achieving the heat dissipation effect.

[0012] In order to facilitate the rotating hollow shaft to drive the stirring shunt pipe to stir the transformer oil in the oil pillow, the rotating hollow shaft is arranged below the liquid level of the transformer oil in the oil pillow, thereby increasing the stirring area.

[0013] The stirring shunt pipe is arranged vertically to the rotating hollow shaft, the highest position of the stirring shunt pipe is located on a plane higher than the highest liquid level of the transformer oil in the oil pillow, and the transformer oil discharged from the stirring shunt pipe can be thrown to the inner wall of the oil pillow, thereby achieving a certain heat dissipation effect.

[0014] In order to increase the filtering area of the arc-shaped filter screen and reduce the influence of the arc-shaped filter screen on the flow rate of the transformer oil in the stirring shunt pipe, the inner diameter of the arc-shaped filter screen is larger than the inner diameter of the stirring shunt pipe.

[0015] The specific structure of the rotating hollow shaft is that the shaft section of the rotating hollow shaft away from the oil inlet pipe is a solid shaft section, one end of the solid shaft section away from the wind driving mechanism is located in the oil pillow, and the solid shaft section can not only increase the strength of the rotating hollow shaft, but also avoid the phenomenon of fracture and bending of the part in contact with the oil pillow and the shaft section in contact with the wind driving mechanism.

[0016] In order to enable the rotating hollow shaft to be located below the liquid level of the transformer oil in the oil pillow at all times, facilitate the transformer oil in the oil pillow to be stirred and cooled, a liquid level detection unit is arranged on one side of the inner wall of the oil pillow, an alarm unit is arranged on the outside of the oil pillow, the liquid level detection unit and the alarm unit are electrically connected with an external control module respectively, and the detection end of the liquid level detection unit is located above the rotating hollow shaft, and the vertical distance between the lower end of the liquid level detection unit and the axis of the rotating hollow shaft is 5-20 cm.

[0017] The specific structure of the first filter assembly is that the first filter assembly further comprises a mounting sleeve, the mounting sleeve is sleeved on one end of the rotating hollow shaft, and the arc-shaped filter screen is arranged at one end of the mounting sleeve away from the rotating hollow shaft.

[0018] In order to assist the first filter assembly in filtering the transformer oil, an auxiliary filter assembly covering the oil inlet pipe port is arranged in the second sleeve, the auxiliary filter assembly is spaced apart from the oil inlet pipe port, the auxiliary filter assembly is arranged between the one end of the rotating hollow shaft and the second sleeve, the filtering area is increased, the transformer oil can be filtered, and the phenomenon of blockage is reduced.

[0019] The specific structure of the auxiliary filter assembly is that the auxiliary filter assembly comprises an auxiliary filter screen, one end of the rotating hollow shaft close to the oil inlet pipe is an oil inlet port, the auxiliary filter screen is installed at the oil inlet port, and the mesh of the auxiliary filter screen is larger than that of the arc-shaped filter screen, so that the phenomenon of reducing the flow rate of the transformer oil at the inlet of the rotating hollow shaft due to the small mesh is reduced.

[0020] In order to further strengthen the stirring and cooling effect of the stirring shunt pipe on the transformer oil in the oil pillow, a plurality of fins are arranged on the outer surface of the stirring shunt pipe along the circumferential direction of the stirring shunt pipe, the length direction of the fins is consistent with the axis direction of the stirring shunt pipe, the fins can not only stir the transformer oil in the oil pillow, but also can cool the heat of the transformer oil flowing in the stirring shunt pipe, especially when the stirring shunt pipe and the fins thereon rotate to above the liquid level of the transformer oil in the oil pillow, the transformer oil can be thrown out to the inner wall of the oil pillow, and the heat in the oil pillow is dispersed.

[0021] The beneficial effects of the present application are that,

[0022] The oil pillow is internally provided with a rotatable rotating hollow shaft and an agitating shunt pipe along the length direction thereof, the rotating hollow shaft is communicated with the oil inlet pipe, the transformer oil in the transformer body which is heated is thrown into the oil pillow through the rotating rotating hollow shaft and the agitating shunt pipe, the agitating shunt pipe can throw the transformer oil to the upper portion of the inner wall of the oil pillow, increase the contact area of the transformer oil and the inner wall of the oil pillow shell, and can accelerate the heat dissipation of the transformer oil, especially, the outlet of each agitating shunt pipe is provided with an arc-shaped filter screen, the narrow filter screen originally arranged at the oil inlet position is expanded to multiple filter screens at the outlet of the agitating shunt pipe, the filtering area of the transformer oil can be doubled, the probability of complete blockage of the filter screen is reduced by several times, and the transformer oil is directly discharged into the oil pillow after passing through the arc-shaped filter screen, greatly reducing the phenomenon of turbulent flow or uneven flow of the transformer oil in the oil inlet position and the agitating shunt pipe.

[0023] The agitating shunt pipe rotates, can agitate the transformer oil in the oil pillow, can enhance the convection of the transformer oil, make the heat of the transformer oil uniformly distributed on the entire oil pillow, and enhancing the convection of the transformer oil can improve the heat transfer efficiency in the oil pillow, make the heat faster transferred from the high-temperature area to the low-temperature area, at the same time, the agitating shunt pipe can break the temperature gradient in the oil pillow, reduce the local overheating phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0024] In the drawings:

[0025] Figure 1 is a schematic view of a perspective structure;

[0026] Figure 2 is a rear view;

[0027] Figure 3 is a schematic view of a sectional structure of A-A of Figure 2 ; is a schematic view of an enlarged structure of A of ; is a schematic view of an enlarged structure of B of

[0028] ; is a schematic view of a heat dissipation unit structure; Figure 4 ; is a schematic view of an enlarged structure of A of Figure 3 ; is a schematic view of an enlarged structure of B of ; is a schematic view of an enlarged structure of A of

[0029] ; is a schematic view of an enlarged structure of B of Figure 5 ; is a schematic view of an enlarged structure of A of ; is a schematic view of an enlarged structure of B of

[0030] ; is a schematic view of an enlarged structure of A of Figure 6 ; is a schematic view of an enlarged structure of B of Figure 5 ; is a schematic view of an enlarged structure of A of ; is a schematic view of an enlarged structure of B of

[0031] ; is a schematic view of an enlarged structure of A of Figure 7 ; is a schematic view of an enlarged structure of B of Figure 3 .

[0032] The components represented by the respective reference signs in the drawings are:

[0033] 1. Transformer body; 2. Oil conservator; 3. Oil delivery pipe; 4. Oil inlet pipe; 5. Rotating hollow shaft; 51. Solid shaft section; 52. Hollow shaft section; 6. Agitator diverter fitting; 61. Agitator diverter pipe; 7. Pipe connector; 71. First sleeve; 72. Second sleeve; 8. Auxiliary filter screen; 9. First filter assembly; 91. Arc-shaped filter screen; 92. Mounting sleeve; 10. Fins; 11. Wind-driven mechanism; 12. Liquid level detection unit. Detailed Implementation

[0034] Example 1

[0035] See Figure 1 , Figure 2 and Figure 3 The oil-immersed transformer shown includes an outdoor transformer body 1 and an oil conservator 2 mounted on and connected to it. The oil conservator 2 is connected to the interior of the transformer body 1 via a rigid oil supply pipe 3 and an oil inlet pipe 4. One end of the oil inlet pipe 4 is connected to the interior of the oil conservator 2, and the other end is connected to the interior of the transformer body 1. The end of the oil inlet pipe 4 located inside the transformer body 1 is connected to an oil pump for pumping transformer oil from the transformer body 1 into the oil conservator 2. One end of the oil supply pipe 3 is connected to the lower part of the oil conservator 2, and the other end is connected to the interior of the transformer body 1. The end of the oil supply pipe 3 located inside the transformer body 1 is also connected to an oil pump for pumping transformer oil from the oil conservator 2 into the transformer body 1, so that the transformer oil can circulate between the oil conservator 2 and the transformer body 1, which facilitates heat dissipation. The method of connecting the oil conservator 2 and the transformer body 1 via oil pipes is existing technology.

[0036] The oil conservator 2 is equipped with a heat dissipation unit, which includes a rotating hollow shaft 5 and an agitator and diverter 6 mounted thereon. The axis of the rotating hollow shaft 5 is aligned with the length direction of the oil conservator 2. One end of the rotating hollow shaft 5 is rotatably connected to one end of the oil inlet pipe 4 extending into the oil conservator 2 via a pipe connector 7, and the other end extends out of the oil conservator 2. A wind-driven mechanism 11 connected to the rotating hollow shaft 5 is provided on the outside of the oil conservator 2. The rotating hollow shaft 5 is rotatably connected to the oil conservator 2, and it is preferably located below the level of the transformer oil inside the oil conservator 2.

[0037] The specific structure of the rotating hollow shaft 5 is as follows: the shaft section away from the oil inlet pipe 4 is a solid shaft section 51, and the shaft section close to the oil inlet pipe 4 is a hollow shaft section 52, which is used to transport transformer oil. The end of the solid shaft away from the wind-driven mechanism 11 is located inside the oil tank 2. Setting the solid shaft can not only enhance the strength of the rotating hollow shaft 5, but also prevent the parts of the rotating hollow shaft 5 that contact the oil tank 2 and the shaft section that contact the wind-driven mechanism 11 from breaking or bending.

[0038] The agitation shunt pipe 6 comprises a plurality of hollow agitation shunt pipes 61 arranged along the length direction of the rotating hollow shaft 5, and each of the agitation shunt pipes 61 is in communication with the rotating hollow shaft 5. In the embodiment, the highest position of the agitation shunt pipe 61 is higher than the highest liquid level of the transformer oil in the oil conservator 2, so that the transformer oil can be effectively agitated when the agitation shunt pipe 61 rotates.

[0039] In the embodiment, the rotating hollow shaft 5 and the agitation shunt pipe 6 are arranged in the oil conservator 2 along the length direction thereof, the rotating hollow shaft 5 is in communication with the oil inlet pipe 4, the transformer oil heated in the transformer body 1 is thrown out to the oil conservator 2 through the rotating hollow shaft 5 and the agitation shunt pipe 61, and the agitation shunt pipe 6 can throw the transformer oil to the upper portion of the inner wall of the oil conservator 2, so as to increase the contact area between the transformer oil and the inner wall of the shell of the oil conservator 2 and accelerate the heat dissipation of the transformer oil.

[0040] Referring to FIGS. 1 and 2, Figure 3 and Figure 4 As shown in FIGS. 1 and 2, the pipeline connector 7 comprises a first sleeve 71 in sealing connection with one end of the oil inlet pipe 4 and a second sleeve 72 sleeved in the first sleeve 71, the second sleeve 72 is in rotational connection with the first sleeve 71, one end of the second sleeve 72 away from the oil inlet pipe 4 is in sealing connection with the end portion of the rotating hollow shaft 5, and the inner diameter of the second sleeve 72 is greater than that of the oil inlet pipe 4.

[0041] Referring to FIGS. 1 and 2, Figure 5 and Figure 6 As shown in FIGS. 1 and 2, in order to improve the filtering effect on the transformer oil, the first filtering assembly 9 is arranged at the end of the agitation shunt pipe 61 away from the rotating hollow shaft 5, the first filtering assembly 9 comprises an arc-shaped filter screen 91 and a mounting sleeve 92, the mounting sleeve 92 is sleeved at the end of the rotating hollow shaft 5, and the mounting sleeve 92 is in threaded connection with the rotating hollow shaft 5, so as to be convenient for disassembly. The arc-shaped filter screen 91 is arranged at the end of the mounting sleeve 92 away from the rotating hollow shaft 5, the inner diameter of the arc-shaped filter screen 91 in the embodiment is greater than that of the agitation shunt pipe 61, the narrow filter screen originally arranged at the oil inlet position is expanded to a plurality of filter screens at the outlet of the agitation shunt pipe 61 by arranging the first filtering assembly 9 on each agitation shunt pipe 61, the filtering area on the transformer oil is doubled, the probability of complete blockage of the filter screen is reduced by a plurality of times, the filtering effect on the transformer oil is not affected, and the transformer oil directly flows into the oil conservator after passing through the arc-shaped filter screen 91, so that the phenomenon of turbulent flow or uneven flow of the transformer oil in the oil inlet position and the agitation shunt pipe 61 is greatly reduced.

[0042] Of course, the oil inlet position is not completely eliminated in this embodiment, but an auxiliary filter assembly is arranged in the second sleeve 72 to cover the port of the oil inlet pipe 4. The auxiliary filter assembly includes an auxiliary filter screen 8. The auxiliary filter screen 8 is arranged on the side of the oil inlet port of the rotating hollow shaft 5, and the auxiliary filter screen 8 is arranged outside the port of the rotating hollow shaft 5, thereby playing a pre-filtering role for the transformer oil.

[0043] Since the plurality of arc-shaped filter screens 91 are arranged, the mesh of the auxiliary filter screen 8 can be increased, thereby reducing the influence of the small mesh of the auxiliary filter screen 8 on the flow rate of the transformer oil. The transformer oil flowing through the stirring shunt pipe 61 can be more smoothly thrown out to the oil pillow 2 under the action of the centrifugal force.

[0044] If the auxiliary filter screen 8 of the auxiliary filter assembly is directly arranged on the port of the oil inlet pipe 4, the port area of the oil inlet pipe 4 is small, so that the filtering area of the auxiliary filter screen 8 is small, which easily affects the flow rate of the transformer oil. In this embodiment, the auxiliary filter assembly is arranged to have a gap with the port of the oil inlet pipe 4, so that the diameter of the auxiliary filter screen 8 is the same as the inner diameter of the second sleeve 72, and the inner diameter of the second sleeve 72 is greater than the inner diameter of the port of the oil inlet pipe 4. Therefore, the filtering area of the auxiliary filter screen 8 can be increased, and the impurities filtered by the auxiliary filter screen 8 can be collected in the second sleeve 72.

[0045] It should be noted that the number of auxiliary filter screens 8 can be flexibly arranged as needed.

[0046] The wind-driven mechanism 11 of this embodiment is a windmill, which is a prior art and can be rotated under the action of wind outside the oil-immersed transformer, thereby driving the rotating hollow shaft 5 and the stirring shunt pipe 61 to rotate, thereby driving the plurality of stirring shunt pipes 61 to stir the transformer oil in the oil pillow 2, thereby playing a heat dissipation effect of the convection of the transformer oil. The stirring shunt pipe 61 not only plays a role of conveying the transformer oil, but also throws the transformer oil heated in the transformer body 1 to the oil pillow 2. The transformer oil contacts the inner wall of the oil pillow 2, and the heat of the transformer oil is quickly conducted to the outside through the shell of the oil pillow 2, thereby playing a heat dissipation effect.

[0047] The embodiment can increase the filtering area of the transformer oil by setting the auxiliary filtering assembly between the second sleeve 72 and the port of the rotating hollow shaft 5, the filtering area of the auxiliary filtering screen 8 of the auxiliary filtering assembly is greater than the port area of the adjacent oil inlet pipe 4, so that the filtered metal scraps and other impurities can be retained in the second sleeve 72, and the second sleeve 72 can be rotated under the driving of the rotating hollow shaft 5, the metal scraps and other impurities can be thrown to the inner wall of the second sleeve 72 under the action of the centrifugal force, so that the metal scraps and other impurities cannot be blocked on the auxiliary filtering screen 8, the phenomenon that the auxiliary filtering screen 8 is blocked and the flow rate of the transformer oil is affected is reduced, and the magnetic attraction piece can be arranged on the inner wall of the second sleeve 72 to adsorb and collect the metal scraps and other impurities, so that the impurities can be conveniently cleaned subsequently, the mesh of the auxiliary filtering screen 8 is greater than the mesh of the arc-shaped filtering screen 91, so that the filtering effect of the impurities in the transformer oil can be achieved, and the phenomenon that the flow rate of the transformer oil is affected due to the too small mesh is avoided.

[0048] Embodiment 2

[0049] The embodiment is a further improvement on the basis of the embodiment 1, in order to make the rotating hollow shaft 5 always below the liquid level of the transformer oil in the oil pillow 2, so as to conveniently achieve a better stirring and heat dissipation effect on the transformer oil in the oil pillow 2, a liquid level detection unit 12 is arranged on one side of the inner wall of the oil pillow 2, and an alarm unit is arranged on the outer side of the oil pillow 2, the alarm unit can be an audible and visual alarm, which is prior art. The liquid level detection unit 12 and the alarm unit (not shown in the figure) are prior art, and the liquid level detection unit 12 and the alarm unit are electrically connected with an external control module respectively, the control module is prior art (not shown in the figure), and is used for remotely receiving and processing signals of the liquid level detection unit 12 and the alarm unit. The detection end of the liquid level detection unit 12 is located above the rotating hollow shaft 5, and the vertical distance between the lower end of the liquid level detection unit 12 and the axis of the rotating hollow shaft 5 is 5-20 cm. When the liquid level in the oil pillow is detected to be lower or higher than the normal set value, the liquid level alarm signal is sent to the control module, the control module processes the liquid level alarm signal, and sends an alarm signal to the alarm unit, the alarm unit alarms according to the alarm signal, prompting the staff to add or reduce the transformer oil in time.

[0050] It should be noted that the liquid level detection unit 12 of the embodiment is a liquid level sensor, which is prior art, and the specific model can be MIK-MP-C ultrasonic liquid level sensor, which uses ultrasonic pulse principle for non-contact measurement. The detection end of the liquid level detection unit 12 is arranged at a certain distance from the axis of the rotating hollow shaft 5, so as to avoid the splashing of the stirred transformer oil to the detection end of the liquid level detection unit 12, and the height of the detection end is set according to the conventional liquid level of the transformer oil in the oil pillow 2 and the distance from the conventional liquid level to the upper side of the inner wall of the oil pillow 2.

[0051] Embodiment 3

[0052] The embodiment is a further improvement based on the embodiment 1 or the embodiment 2. In the embodiment, in order to further strengthen the stirring and heat dissipation effect of the stirring shunt pipe 61 on the transformer oil in the oil pillow 2, a plurality of fins 10 are arranged on the outer surface of the stirring shunt pipe 61 along the circumferential direction of the stirring shunt pipe 61. The length direction of the fins 10 is consistent with the axis direction of the stirring shunt pipe 61. The fins 10 can not only play a role in stirring the transformer oil in the oil pillow 2, but also can play a certain heat dissipation effect on the heat of the transformer oil flowing in the stirring shunt pipe 61. Especially when the stirring shunt pipe 61 and the fins 10 thereon rotate to above the liquid level of the transformer oil in the oil pillow 2, the transformer oil can be thrown out to the inner wall of the oil pillow 2 to disperse the heat therein.

[0053] Embodiment 4

[0054] The embodiment is a further improvement based on the embodiment 1 or the embodiment 2. In the embodiment, in order to further strengthen the stirring and heat dissipation effect of the stirring shunt pipe 61 on the transformer oil in the oil pillow 2, a plurality of fins 10 are arranged on the outer surface of the stirring shunt pipe 61 along the circumferential direction of the stirring shunt pipe 61. The length direction of the fins 10 is consistent with the axis direction of the stirring shunt pipe 61. The fins 10 can not only play a role in stirring the transformer oil in the oil pillow 2, but also can play a certain heat dissipation effect on the heat of the transformer oil flowing in the stirring shunt pipe 61. Especially when the stirring shunt pipe 61 and the fins 10 thereon rotate to above the liquid level of the transformer oil in the oil pillow 2, the transformer oil can be thrown out to the inner wall of the oil pillow 2 to disperse the heat therein. Figure 7 The second sleeve 72 of the embodiment can not be provided with the auxiliary filter screen 8, so as to ensure the normal flow rate of the transformer oil. The transformer oil is filtered only by the first filter assembly 9, and a good filtering effect can be achieved.

Claims

1. An oil-immersed transformer comprising a transformer body (1) and an oil reservoir (2) provided on and communicating with the transformer body (1), the oil reservoir (2) communicating with the inside of the transformer body (1) through a hard oil delivery pipe (3) and an oil inlet pipe (4), characterized in that, The oil pillow (2) is provided with a heat dissipation unit, the heat dissipation unit comprises a rotating hollow shaft (5) and an agitating shunt pipe (6) arranged on the rotating hollow shaft (5), the axis of the rotating hollow shaft (5) is consistent with the length direction of the oil pillow (2), one end of the rotating hollow shaft (5) is rotatably connected with the one end of the oil inlet pipe (4) extending into the oil pillow (2) through a pipe connector (7), the other end of the rotating hollow shaft (5) penetrates out of the oil pillow (2), the outer side of the oil pillow (2) is provided with a wind driven mechanism (11) connected with the rotating hollow shaft (5), the rotating hollow shaft (5) is rotatably connected with the oil pillow (2); The agitating shunt pipe (6) comprises a plurality of hollow agitating shunt pipes (61), the plurality of agitating shunt pipes (61) are arranged along the length direction of the rotating hollow shaft (5), and the agitating shunt pipes (61) are all arranged in communication with the rotating hollow shaft (5); The pipe connector (7) comprises a first sleeve (71) sealingly connected with one end of the oil inlet pipe (4) and a second sleeve (72) sleeved in the first sleeve (71), the second sleeve (72) is rotatably connected with the first sleeve (71), the second sleeve (72) is sealingly connected with the end of the rotating hollow shaft (5) away from the one end of the oil inlet pipe (4), and the inner diameter of the second sleeve (72) is larger than the inner diameter of the oil inlet pipe (4); The agitating shunt pipe (61) is provided with a first filter assembly (9) at the port away from the rotating hollow shaft (5), the first filter assembly (9) comprises an arc-shaped filter screen (91); The highest position of the agitating shunt pipe (61) is higher than the highest liquid level of the transformer oil in the oil pillow (2); The second sleeve (72) is provided with an auxiliary filter assembly covering the port of the oil inlet pipe (4), and the auxiliary filter assembly is provided with a gap relative to the port of the oil inlet pipe (4); The auxiliary filter assembly comprises an auxiliary filter screen (8), the one end of the rotating hollow shaft (5) close to the oil inlet pipe (4) is an oil inlet port, and the auxiliary filter screen (8) is installed on the oil inlet port, and the mesh of the auxiliary filter screen (8) is larger than the mesh of the arc-shaped filter screen (91).

2. An oil immersed transformer according to claim 1, characterized in that The rotating hollow shaft (5) is below the liquid level of the transformer oil in the oil pillow (2).

3. An oil immersed transformer according to claim 1, characterized in that The inner diameter of the arc-shaped filter screen (91) is larger than the inner diameter of the agitating shunt pipe (61).

4. An oil immersed transformer according to claim 1, characterized in that The shaft section of the rotating hollow shaft (5) away from the oil inlet pipe (4) is a solid shaft section (51), and the one end of the solid shaft section away from the wind driven mechanism (11) is located in the oil pillow (2).

5. An oil immersed transformer as claimed in claim 1, wherein, The inner wall of the oil pillow (2) is provided with a liquid level detection unit (12) on one side, and the outer side of the oil pillow (2) is provided with an alarm unit, the liquid level detection unit (12) and the alarm unit are respectively electrically connected with an external control module, the detection end of the liquid level detection unit (12) is located above the rotating hollow shaft (5), and the vertical distance between the lower end of the liquid level detection unit (12) and the axis of the rotating hollow shaft (5) is 5-20 cm.

6. An oil immersed transformer according to claim 5, characterised in that The first filter assembly (9) further comprises a mounting sleeve (92), the mounting sleeve (92) is sleeved on the one end of the rotating hollow shaft (5), and the arc-shaped filter screen (91) is arranged on the one end of the mounting sleeve (92) away from the rotating hollow shaft (5).

7. An oil immersed transformer as claimed in claim 1, wherein, The outer surface of the stirring shunt pipe (61) is provided with a plurality of fins (10) along the circumferential direction of the stirring shunt pipe (61), and the length direction of the fins (10) is consistent with the axis direction of the stirring shunt pipe (61).

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