Oil flow pipeline and oil-immersed transformation equipment
By designing oil collection pipes and flow resistance pipes in oil-immersed transformers, the direction of oil flow is changed and the flow resistance is increased, which solves the problem of poor cooling effect in locations far from the cooler and improves the uniformity of winding temperature and the stability of the equipment.
Patent Information
- Application Number
- CN202422744814.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-11-11
AI Technical Summary
In existing oil-immersed transformer equipment, the oil flow rate is small in the area far from the cooler, resulting in poor cooling effect, uneven winding temperature, and even local overheating, which affects the stability of the equipment.
Design an oil flow pipeline including an oil collection pipe, a straight pipe element, and a flow resistance pipeline element. By setting the flow resistance pipeline element near the cooler, the direction of oil flow is changed and the flow distance is extended. Combined with the U-shaped tube structure, the flow resistance is increased, ensuring uniform distribution of oil flow and improving the heat dissipation performance of the location away from the cooler.
This achieves uniform cooling of all components in the oil-immersed transformer, reduces winding temperature, and improves equipment stability and service life.
Smart Images
Figure CN223638197U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field especially relates to an oil flow pipeline and oil immersed transformer equipment. BACKGROUND
[0002] When the cooler is arranged on one side of the oil immersed transformer equipment, the high-temperature oil in the oil tank of the transformer body enters the cooler, and the oil cooled by the cooler flows into the oil tank from the bottom to complete the cooling cycle. In the prior art, the oil outlet is only arranged in a local part, and the structure of the oil tank in the transformer body is complex. In the vicinity of the cooler, the oil inlet and outlet of the oil collecting pipe are very close, so the oil outlet flow of the oil collecting pipe on this side is large, and the cooling of the corresponding part is good. However, most of the oil flows in the cycle near the outlet of the cooler, so that the oil outlet flow of the oil collecting pipe far away from the cooler is small, which leads to a high temperature of the winding far away from the cooler and poor overall cooling effect, and even causes local overheating of the winding of the transformer body. SUMMARY
[0003] The utility model provides an oil flow pipeline and oil immersed transformer equipment, can solve the prior art oil immersed transformer equipment far away from the position of the cooler and the problem of small oil outlet flow and poor cooling effect, thereby guaranteeing the cooling performance of the oil immersed transformer equipment, uniformly reducing the winding temperature and improving the stability of the product.
[0004] To solve the above technical problems, the utility model provides an oil flow pipeline, which comprises a collecting pipe, a straight pipe element and a flow resistance pipeline element.
[0005] The collecting pipe comprises a first collecting pipe section and a second collecting pipe section in communication. The first collecting pipe section is provided with a first oil inlet communicated with the cooler of the oil immersed transformer equipment and a first oil outlet communicated with the transformer body of the oil immersed transformer equipment. The oil cooled by the cooler enters the collecting pipe through the first oil inlet. Part of the oil in the collecting pipe flows into the first collecting pipe section and is then delivered to the first oil inlet interface of the transformer body near the cooler through the first oil outlet. Another part of the oil in the collecting pipe flows into the second collecting pipe section and is then delivered to the second oil inlet interface of the transformer body far away from the cooler through the second oil outlet formed on the second collecting pipe section. The oil flowing through the transformer body and absorbing heat is delivered back to the cooler through the pipeline for cooling.
[0006] The oil inlet end of the straight pipe element is communicated with the second oil outlet, and the oil outlet end of the straight pipe element is communicated with the second oil inlet interface.
[0007] The oil inlet end of the flow resistance pipeline element is communicated with the first oil outlet, and the oil outlet end of the flow resistance pipeline element is communicated with the first oil inlet interface. The volume of the oil flowing out of the oil outlet end of the flow resistance pipeline element per unit time is the same as that of the oil flowing out of the oil outlet end of the straight pipe element per unit time.
[0008] The oil flow pipeline provided by the utility model on the one hand, by setting flow resistance pipeline element on the oil collecting pipe close to the cooler, can utilize one or more ways of changing the flow direction of the oil in the flow resistance pipeline element, extending the flow distance in the flow resistance pipeline element, reducing the cross-sectional area of at least part of the flow resistance pipeline element, so that the volume of the oil flowing out of the oil outlet end of the flow resistance pipeline element per unit time is the same as the volume of the oil flowing out of the oil outlet end of the straight pipe element per unit time, that is, the flux of the oil outlet end of the flow resistance pipeline element is equal to the flux of the oil outlet end of the straight pipe element, thereby evenly distributing the oil close to the cooler and the oil away from the cooler in the oil collecting pipe, improving the heat dissipation performance of the oil-immersed transformer equipment away from the cooler, reducing the operating temperature, avoiding local winding overheating, improving the stability of the product, and prolonging the service life of the product.
[0009] Further, a U-shaped pipe structure is arranged between the oil inlet end of the flow resistance pipeline element and the oil outlet end of the flow resistance pipeline element. The U-shaped pipe structure not only increases the length of the oil flow path, but also significantly increases the resistance of the fluid by changing the flow direction of the oil multiple times, thereby ensuring that the first oil inlet interface of the transformer body on the side close to the cooler maintains appropriate flux, and preventing uneven cooling of the side with the cooler and the side away from the cooler due to too fast oil flow.
[0010] Further, the U-shaped pipe structure includes a first straight pipe section, an intermediate connecting pipe, and a second straight pipe section, the oil inlet end of the first straight pipe section is in communication with the first oil outlet port, the oil outlet end of the first straight pipe section is in communication with the oil inlet end of the intermediate connecting pipe, the oil outlet end of the intermediate connecting pipe is in communication with the oil inlet end of the second straight pipe section, the oil inlet end and the oil outlet end of the second straight pipe section are in communication with the first oil inlet interface, the intermediate connecting pipe extends along a straight line, and the first straight pipe section and the second straight pipe section are perpendicular to the intermediate connecting pipe. By designing the corners of the U-shaped pipe structure as two opposite right angles, the turbulence and pressure loss caused by the sharp turn of the oil flow are further improved, and the flow rate can be more effectively reduced.
[0011] Further, the first straight pipe section and the second straight pipe section are parallel to the first oil collecting pipe section, and the intermediate connecting pipe is perpendicular to the first oil collecting pipe section; the flow resistance pipeline element further includes an oil inlet end connecting pipe and an oil outlet end connecting pipe, the first straight pipe section is in communication with the first oil outlet port through the oil inlet end connecting pipe, and the second straight pipe section is in communication with the first oil inlet interface through the oil outlet end connecting pipe. This design ensures stable oil flow and facilitates production and assembly of the flow resistance pipeline element.
[0012] Further, the oil inlet end connecting pipe is detachably connected with the first oil outlet, and the oil outlet end connecting pipe is detachably connected with the first oil inlet. The detachable connection increases the maintainability of the oil flow pipeline, and the user can conveniently disassemble and clean the pipeline when needed, thereby prolonging the service life of the pipeline. In addition, the U-shaped pipe structure can be removed and replaced by a perforated plate, a necked pipe, an elbow or other structures or devices for increasing fluid resistance, thereby improving the versatility of the pipeline. The detachable connection between the oil inlet end connecting pipe and the first oil outlet and the detachable connection between the oil outlet end connecting pipe and the first oil inlet can be achieved by providing a threaded connecting piece, a clamping sleeve connecting piece, a groove joint or the like.
[0013] Further, the diameters of the first oil outlet and the second oil outlet are equal, and the first oil outlet and the second oil outlet are both directed towards the transformer body. The flow resistance pipeline element arranged at the first oil outlet has an inner diameter equal to that of the straight pipe element arranged at the second oil outlet, and the height of the flow resistance pipeline element and the straight pipe element in the direction towards the transformer body is equal. This design further ensures the consistency of the oil flow path, so as to facilitate the control of uniform pressure and flow rate of the oil during the flow process. Since the oil collecting pipe is usually arranged at the bottom of the oil-immersed transformer device, the opening of the first oil outlet and the second oil outlet towards the transformer body is more convenient for production and assembly.
[0014] Further, the first oil collecting pipe section is provided with a plurality of first oil outlets, the transformer body close to the cooler has a plurality of first oil inlets equal in number to the plurality of first oil outlets, and each of the plurality of first oil outlets is in communication with a corresponding one of the plurality of first oil inlets of the transformer body close to the cooler through a flow resistance pipeline element. The second oil collecting pipe section is provided with a plurality of second oil outlets, the transformer body away from the cooler has a plurality of second oil inlets equal in number to the plurality of second oil outlets, and each of the plurality of second oil outlets is in communication with a corresponding one of the plurality of second oil inlets of the transformer body away from the cooler through a straight pipe element. This design significantly improves the oil delivery efficiency and ensures the cooling efficiency and cooling uniformity between the various components of the oil-immersed transformer device.
[0015] Further, the first oil collecting pipe section and the second oil collecting pipe section are equal in length and arranged in parallel to each other, and the oil collecting pipe further comprises an oil collecting communication pipe section in communication between the first oil collecting pipe section and the second oil collecting pipe section. The plurality of first oil outlets are arranged in an axial direction of the first oil collecting pipe section, and the plurality of second oil outlets are arranged in an axial direction of the second oil collecting pipe section. By arranging the first oil collecting pipe section and the second oil collecting pipe section equal in length and arranged in parallel to each other, the oil flow can be more evenly distributed and the space layout can be optimized, thereby maintaining high efficiency in an effective space.
[0016] Further, the first oil collecting pipe section is provided with a plurality of first oil inlets, the cooler has a plurality of oil outlets equal in number to the plurality of first oil inlets, and each of the plurality of first oil inlets is in communication with a corresponding one of the plurality of oil outlets of the cooler. This design can realize uniform distribution of oil at the plurality of oil outlets, thereby improving the oil distribution efficiency of the entire system.
[0017] According to another aspect of the present application, there is provided an oil-immersed transformer device, comprising a transformer body, a cooler and the oil flow pipeline as described above, the cooler is arranged on one side of the transformer body, and the transformer body and the cooler are communicated through the oil flow pipeline, so that the oil cooled by the cooler flows into the transformer body through the oil flow pipeline; the oil flowing through the transformer body absorbs heat and is transported back to the cooler through the pipeline for cooling.
[0018] According to another aspect of the present application, there is provided an oil-immersed transformer device, comprising a transformer body, a cooler and the oil flow pipeline as described above, the cooler is arranged on one side of the transformer body, and the transformer body and the cooler are communicated through the oil flow pipeline, so that the oil cooled by the cooler flows into the transformer body through the oil flow pipeline; the oil flowing through the transformer body absorbs heat and is transported back to the cooler through the pipeline for cooling. BRIEF DESCRIPTION OF DRAWINGS
[0019] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:
[0020] Figure 1 is a perspective view of the oil flow pipeline according to the present application;
[0021] Figure 2 is Figure 1 is a partial view of the flow resistance pipeline element in the middle;
[0022] Figure 3 is Figure 1 is a partial view of the straight pipe element in the middle;
[0023] Figure 4 is a side view of the oil flow pipeline according to the present application;
[0024] Figure 5 is a top view of the oil flow pipeline according to the present application;
[0025] Figure 6 is a schematic view of the oil-immersed transformer device according to the present application.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 1, oil collecting pipe; 11, first oil collecting pipe section; 111, first oil inlet;
[0028] 112 first oil outlet; 12 second oil collecting pipe section; 121 second oil outlet;
[0029] 13 oil collecting communication pipe section;
[0030] 2 flow resistance pipe element; 21 U-shaped pipe structure; 22 oil inlet end connecting pipe;
[0031] 23 oil outlet end connecting pipe; 24 oil inlet end of flow resistance pipe element; 25 oil outlet end of flow resistance pipe element
[0032] 3 straight pipe element; 31 oil inlet end of straight pipe element; 32 oil outlet end of straight pipe element;
[0033] 10 oil flow pipe; 50 transformer body; 60 cooler. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0035] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise.
[0036] Figure 1 is a perspective view of an oil flow pipe 10 according to the present application, showing one embodiment of the oil flow pipe 10;
[0037] Figure 2 is a partial view of the flow resistance pipe element 2, showing the detailed structure of the partial A in Figure 1 Figure 3 is a partial view of the straight pipe element 3 in Figure 1 , showing the detailed structure of the partial B in Figure 1 Figure 4 and Figure 5 are respectively a perspective side view and a perspective top view of an oil flow pipe 10 according to the present application.
[0038] Referring to Figures 1 to 5 According to the oil flow pipeline 10 and the oil-immersed transformer equipment, the oil flow pipeline 10 comprises an oil collecting pipe 1, a straight pipe element 3 and a flow resistance pipeline element 2, the oil collecting pipe 1 comprises a first oil collecting pipe section 11 and a second oil collecting pipe section 12 which are connected in communication, the first oil collecting pipe section 11 is provided with a first oil inlet 111 communicated with a cooler 60 of the oil-immersed transformer equipment and a first oil outlet 112 communicated with a transformer body 50 of the oil-immersed transformer equipment, oil cooled by the cooler 60 enters the oil collecting pipe 1 through the first oil inlet 111, part of the oil in the oil collecting pipe 1 flows into the first oil collecting pipe section 11 and is then delivered to a first oil inlet interface of the transformer body 50 close to the cooler 60 through the first oil outlet 112, another part of the oil in the oil collecting pipe 1 flows into the second oil collecting pipe section 12 and is then delivered to a second oil inlet interface of the transformer body 50 far away from the cooler 60 through a second oil outlet 121 formed on the second oil collecting pipe section 12, the oil flowing through the transformer body 50 and absorbing heat is delivered back to the cooler 60 through the pipeline for cooling, an oil inlet end 31 of the straight pipe element is communicated with the second oil outlet 121, an oil outlet end 32 of the straight pipe element is communicated with the second oil inlet interface, an oil inlet end 24 of the flow resistance pipeline element is communicated with the first oil outlet 112, an oil outlet end 25 of the flow resistance pipeline element is communicated with the first oil inlet interface, and the volume of the oil flowing out of the oil outlet end 25 of the flow resistance pipeline element per unit time is the same as the volume of the oil flowing out of the oil outlet end 32 of the straight pipe element per unit time.
[0039] The oil flow pipeline 10 in the utility model, by setting flow resistance pipeline element 2 on the oil collecting pipe 1 close to cooler 60, utilize the flow direction of oil in flow resistance pipeline element 2 is transformed, the flow distance in flow resistance pipeline element is lengthened, the cross-sectional area of at least part of flow resistance pipeline element is reduced in one way or more ways combination, make the volume of the oil flowing out of the oil outlet end 25 of the flow resistance pipeline element per unit time be the same as the volume of the oil flowing out of the oil outlet end 32 of the straight pipe element per unit time, so that the oil close to cooler 60 in oil collecting pipe 1 and the oil far away from cooler 60 are evenly distributed, thereby improving the heat dissipation performance of the oil-immersed transformer equipment far away from the cooler 60, reducing its operating temperature, avoiding local winding overheating, improving the stability of the product, prolonging the service life of the product.
[0040] In some specific embodiments, a U-shaped pipe structure is arranged between the oil inlet end 24 of the flow resistance pipeline element 2 and the oil outlet end 25 of the flow resistance pipeline element 2. The U-shaped pipe structure 21 not only increases the length of the oil flow path, but also significantly increases the resistance of the fluid by changing the flow direction of the oil multiple times, thereby ensuring that the first oil inlet interface of the transformer body 50 on the side close to the cooler 60 maintains appropriate flux, preventing the transformer from being unevenly cooled on the side close to the cooler 60 and the side far away from the cooler 60 due to the oil flowing too fast.
[0041] In some further embodiments, the U-shaped pipe structure 21 comprises a first straight pipe section, an intermediate connecting pipe and a second straight pipe section, the oil inlet end of the first straight pipe section is communicated with the first oil outlet 112, the oil outlet end of the first straight pipe section is communicated with the oil inlet end of the intermediate connecting pipe, the oil outlet end of the intermediate connecting pipe is communicated with the oil inlet end of the second straight pipe section, the oil outlet end of the second straight pipe section is communicated with the first oil inlet interface of the transformer body 50 close to the cooler 60, and the intermediate connecting pipe extends in a straight line. By designing the corners of the U-shaped pipe structure 21 as two opposite right angles, the turbulence and pressure loss caused by the sharp turn of the oil flow are further improved, and the flow rate can be more effectively reduced.
[0042] For example, in the embodiments shown in Figure 1 and Figure 2 , the first straight pipe section and the second straight pipe section are parallel to the first oil collecting pipe section 11, and the intermediate connecting pipe is perpendicular to the first oil collecting pipe section 11; the flow resistance pipe element 2 further comprises an oil inlet end connecting pipe 22 and an oil outlet end connecting pipe 23, the first straight pipe section is communicated with the first oil outlet 112 through the oil inlet end connecting pipe 22, and the second straight pipe section is communicated with the first oil inlet interface through the oil outlet end connecting pipe 23. This design ensures stable oil flow and facilitates production and assembly of the flow resistance pipe element 2.
[0043] In some embodiments, the oil inlet end connecting pipe 22 is detachably connected with the first oil outlet 112, and the oil outlet end connecting pipe 23 is detachably connected with the first oil inlet interface. By providing detachable connection, the maintainability of the oil flow pipe 10 is improved, and users can conveniently disassemble and clean the pipe when needed, thereby prolonging the service life of the pipe; in addition, the U-shaped pipe structure can be removed and replaced by other structures or devices for increasing fluid resistance, such as orifice plates, necked pipes, elbows, etc., thereby improving the versatility of the pipe. The detachable connection between the oil inlet end connecting pipe 22 and the first oil outlet 112 and the detachable connection between the oil outlet end connecting pipe 23 and the first oil inlet interface can be achieved by providing threaded connections, clamping sleeve connections, groove joints, etc.
[0044] Further, the diameters of the first oil outlet 112 and the second oil outlet 121 are equal, and the first oil outlet 112 and the second oil outlet 121 are both directed towards the transformer body 50; the inner diameter of the flow resistance pipe element 2 arranged at the first oil outlet 112 is equal to that of the straight pipe element 3 arranged at the second oil outlet 121, and the height of the flow resistance pipe element 2 and the straight pipe element 3 in the direction towards the transformer body 50 is equal. This design further ensures the consistency of the oil flow path, so as to facilitate control of uniform pressure and flow rate of the oil during flow. Since the oil collecting pipe 1 is usually arranged at the bottom of the oil-immersed transformer equipment, the first oil outlet 112 and the second oil outlet 121 are directed towards the transformer body, which is more convenient for production and assembly.
[0045] More specifically, the first oil collecting pipe section 11 is provided with a plurality of first oil outlets 112, the transformer body 50 close to the cooler 60 is provided with a plurality of first oil inlet interfaces equal in number to the plurality of first oil outlets 112, and each of the plurality of first oil outlets 112 is communicated with a corresponding one of the plurality of first oil inlet interfaces of the transformer body 50 close to the cooler 60 through a flow resistance pipe element 2. The second oil collecting pipe section 12 is provided with a plurality of second oil outlets 121, the transformer body 50 away from the cooler 60 is provided with a plurality of second oil inlet interfaces equal in number to the plurality of second oil outlets 121, and each of the plurality of second oil outlets 121 is communicated with a corresponding one of the plurality of second oil inlet interfaces of the transformer body 50 away from the cooler 60 through a straight pipe element 3. The design significantly improves the oil delivery efficiency and ensures the cooling efficiency and cooling uniformity between the various components of the oil-immersed transformer equipment. Since the oil collecting pipe is usually arranged at the bottom of the oil-immersed transformer equipment, the first oil outlet and the second oil outlet are open towards the transformer body, which is more convenient for production and assembly.
[0046] Referring to Figure 5 , the first oil collecting pipe section 11 and the second oil collecting pipe section 12 are equal in length and arranged in parallel with each other, and the oil collecting pipe 1 further comprises an oil collecting communication pipe section 13 communicated between the first oil collecting pipe section 11 and the second oil collecting pipe section 12. The plurality of first oil outlets 112 are arranged in an axial direction of the first oil collecting pipe section 11, and the plurality of second oil outlets 121 are arranged in an axial direction of the second oil collecting pipe section 12. By arranging the first oil collecting pipe section 11 and the second oil collecting pipe section 12 equal in length and arranged in parallel with each other, the oil flow can be more evenly distributed and the space layout can be optimized, and high efficiency can be maintained in the effective space.
[0047] In some preferred embodiments, the first oil collecting pipe section 11 is provided with a plurality of first oil inlets 111, and the cooler 60 is provided with a plurality of oil outlets equal in number to the plurality of first oil inlets 111, and each of the plurality of first oil inlets 111 is communicated with a corresponding one of the plurality of oil outlets of the cooler 60. This design can achieve uniform distribution of oil in the plurality of oil outlets, thereby improving the oil distribution efficiency of the entire system. Alternatively, the plurality of first oil outlets 112 and the plurality of first oil inlets 111 are staggered on the first oil collecting pipe section 11, so as to optimize the space layout of the oil-immersed transformer equipment.
[0048] Figure 6 is a schematic view of an oil-immersed transformer equipment according to the present application, which shows the structure of the oil-immersed transformer equipment.
[0049] According to another aspect of the utility model, an oil-immersed transformer equipment is provided, which comprises a transformer body 50, a cooler 60 and the oil flow pipeline 10, the cooler 60 is arranged on one side of the transformer body 50, the oil-immersed transformer body 50 and the cooler 60 are communicated through the oil flow pipeline 10, and the oil cooled by the cooler 60 flows into the transformer body 50 through the oil flow pipeline 10; the oil after heat absorption of the transformer body 50 is transported back to the cooler 60 through the pipeline for cooling.
[0050] The oil-immersed transformer equipment adopts the oil flow pipeline 10, and the oil flow pipeline 10 has the advantages of uniform oil quantity transportation and good cooling effect, so the oil-immersed transformer equipment also has good quality in the corresponding aspects.
[0051] The technical effect of the scheme of the utility model is that the problem of excessive or insufficient oil flow in the oil flow pipeline 10 is avoided, the cooling balance between each component of the oil-immersed transformer equipment close to or away from the cooler 60 is ensured, the winding temperature is uniformly reduced, and the stability and service life of the product are improved. It should be noted that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection scope of the utility model.
Claims
1. An oil flow line (10), characterized in that The application relates to an oil collecting pipe (1) and a flow resistance pipeline element (2) and a straight pipe element (3). The oil collecting pipe (1) comprises a first oil collecting pipe section (11) and a second oil collecting pipe section (12) in communication; a first oil inlet (111) and a first oil outlet (112) are formed on the first oil collecting pipe section (11) and are in communication with a cooler (60) of an oil-immersed transformer device and a transformer body (50) of the oil-immersed transformer device; the oil cooled by the cooler (60) enters the oil collecting pipe (1) through the first oil inlet (111); part of the oil in the oil collecting pipe (1) flows into the first oil collecting pipe section (11) and is then transported to a first oil inlet interface of the transformer body (50) close to the cooler (60) through the first oil outlet (112); another part of the oil in the oil collecting pipe (1) flows into the second oil collecting pipe section (12) and is then transported to a second oil inlet interface of the transformer body (50) far away from the cooler (60) through a second oil outlet (121) formed on the second oil collecting pipe section (12); the oil flowing through the transformer body (50) absorbs heat and is then transported back to the cooler (60) for cooling through a pipeline; The straight pipe element (3) has an oil inlet end (31) in communication with the second oil outlet (121) and an oil outlet end (32) in communication with the second oil inlet interface; The flow resistance pipeline element (2) has an oil inlet end (24) in communication with the first oil outlet (112) and an oil outlet end (25) in communication with the first oil inlet interface; the volume of the oil flowing out of the oil outlet end (25) of the flow resistance pipeline element per unit time is the same as the volume of the oil flowing out of the oil outlet end (32) of the straight pipe element per unit time.
2. The oil flow line (10) according to claim 1, characterized in that A U-shaped pipe structure (21) is arranged between the oil inlet end (24) of the flow resistance pipeline element and the oil outlet end (25) of the flow resistance pipeline element.
3. The oil flow line (10) according to claim 2, characterized in that The U-shaped pipe structure (21) comprises a first straight pipe section, an intermediate connecting pipe and a second straight pipe section; the oil inlet end of the first straight pipe section is in communication with the first oil outlet (112); the oil outlet end of the first straight pipe section is in communication with the oil inlet end of the intermediate connecting pipe; the oil outlet end of the intermediate connecting pipe is in communication with the oil inlet end of the second straight pipe section; the oil outlet end of the second straight pipe section is in communication with the first oil inlet interface; the intermediate connecting pipe extends in a straight line; the first straight pipe section and the second straight pipe section are perpendicular to the intermediate connecting pipe.
4. The oil flow line (10) according to claim 3, characterized in that The first straight pipe section and the second straight pipe section are parallel to the first oil collecting pipe section (11); the intermediate connecting pipe is perpendicular to the first oil collecting pipe section (11); the flow resistance pipeline element (2) further comprises an oil inlet end connecting pipe (22) and an oil outlet end connecting pipe (23); the first straight pipe section is in communication with the first oil outlet (112) through the oil inlet end connecting pipe (22); the second straight pipe section is in communication with the first oil inlet interface through the oil outlet end connecting pipe (23).
5. The oil flow line (10) according to claim 4, characterized in that The oil inlet end connecting pipe (22) is detachably connected with the first oil outlet (112), and the oil outlet end connecting pipe (23) is detachably connected with the first oil inlet.
6. The oil flow line (10) according to any one of claims 2 to 5, characterized in that The diameters of the first oil outlet (112) and the second oil outlet (121) are equal, and the first oil outlet (112) and the second oil outlet (121) are both directed towards the transformer body (50); the flow resistance pipe element (2) arranged at the first oil outlet (112) has the same inner diameter as the straight pipe element (3) arranged at the second oil outlet (121), and the height of the flow resistance pipe element (2) and the straight pipe element (3) are equal in the direction towards the transformer body (50).
7. The oil flow line (10) according to claim 6, characterized in that The first oil outlet (112) is arranged on the first oil collecting pipe section (11), and the transformer body (50) close to the cooler (60) has a number of first oil inlets equal to the number of the first oil outlets (112), and each first oil outlet (112) is communicated with a first oil inlet through a flow resistance pipe element (2); the second oil outlet (121) is arranged on the second oil collecting pipe section (12), and the transformer body (50) away from the cooler (60) has a number of second oil inlets equal to the number of the second oil outlets (121), and each second oil outlet (121) is communicated with a second oil inlet through a straight pipe element (3).
8. The oil flow line (10) according to claim 7, characterized in that The first oil collecting pipe section (11) and the second oil collecting pipe section (12) have equal length and are arranged in parallel, and the oil collecting pipe (1) further comprises an oil collecting communication pipe section (13) communicated between the first oil collecting pipe section (11) and the second oil collecting pipe section (12); a plurality of first oil outlets (112) are arranged along the axial direction of the first oil collecting pipe section (11) at intervals, and a plurality of second oil outlets (121) are arranged along the axial direction of the second oil collecting pipe section (12) at intervals.
9. The oil flow line (10) according to claim 8, characterized in that A plurality of first oil inlets (111) are arranged on the first oil collecting pipe section (11), and the cooler (60) has a number of oil outlets equal to the number of the first oil inlets (111), and each first oil inlet (111) is communicated with an oil outlet.
10. An oil-immersed power transformer apparatus, characterized by, The oil flow pipe (10) comprises a transformer body (50), a cooler (60) and any one of the oil flow pipes (10) according to claims 1 to 9, the cooler (60) is arranged on one side of the transformer body (50), and the transformer body (50) and the cooler (60) are communicated through the oil flow pipe (10), so that the oil cooled by the cooler (60) flows into the transformer body (50) through the oil flow pipe (10); the oil flowing through the transformer body (50) absorbs heat and is transported back to the cooler (60) through the pipe for cooling.