Oil return pipe structure, cooling device and power transformer

Abstract

The utility model provides an oil return pipe structure, a cooling device and a power transformer. One end of each first communicating branch pipe is connected with the communicating main pipe, and the other end of each first communicating branch pipe is used for being connected with a heat exchanger so that a heat exchange medium in the heat exchanger can be conveyed into the communicating main pipe; the second communicating branch pipes are used for being connected with the parts to be subjected to heat exchange in a one-to-one correspondence mode, at least one first communicating branch pipe is arranged between every two adjacent second communicating branch pipes, and the second communicating branch pipes are all connected with the communicating main pipe; wherein at least one first communicating branch pipe is provided with a flow dividing pipe section located in a pipe cavity of the communicating main pipe, the flow dividing pipe section is provided with a notch, and the orientation of the notch is consistent with the flow direction of the heat exchange medium in the communicating main pipe, so that the heat exchange medium is guided to the corresponding second communicating branch pipe through the notch. According to the utility model, the problem of poor distribution effect of cooling oil of the power transformer in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transformer cooling, in particular to an oil return pipe structure, a cooling device and a power transformer. Background Art

[0002] The main column of the power transformer is the main structural component of the power transformer. It plays the role of supporting and fixing important components such as coils and cores. The main column can also help dissipate heat by introducing cooling medium to maintain the normal operating temperature of the power transformer. In addition, the main column can also protect the insulation material and support the winding. Therefore, the main column plays a very important role in the power transformer.

[0003] At present, in power transformers with a voltage level of 750kV, since the high-voltage winding outlet device is generally located at the top or side of the left main column body, the wires of the high-voltage winding are connected through the high-voltage winding outlet device for electrical connection and operation. As a result, the cooling oil cooler cannot be arranged at the location of the high-voltage winding outlet device, making it difficult for the cooling oil in the cooling oil cooler to evenly enter the body of each main column.

[0004] In this regard, in the related art, the method generally adopted is to add an oil return pipe to the circuit where the cooling oil enters the transformer, and the oil return pipe extends to the high-voltage winding outlet device, so that the cooling oil enters the left main column body. However, due to the oil resistance, the cooling oil is more likely to flow on the path with less oil resistance. Therefore, although the method of setting the oil return pipe allows the cooling oil to enter the left main column body, the distribution of the cooling oil has been improved to a certain extent, but the distribution of the cooling oil flowing to each main column is not uniform, the distribution effect is not good, and the improvement effect is not obvious. Utility Model Content

[0005] The main purpose of the utility model is to provide an oil return pipe structure, a cooling device and a power transformer to solve the problem of poor distribution effect of cooling oil of the power transformer in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the utility model, there is provided an oil return pipe structure, comprising: a connecting main pipe; a plurality of first connecting branch pipes, one end of each of the first connecting branch pipes is connected to the connecting main pipe, and the other end of each of the first connecting branch pipes is used to be connected to the heat exchanger, so as to transport the heat exchange medium in the heat exchanger to the connecting main pipe; a plurality of second connecting branch pipes, which are used to be connected to a plurality of parts to be heat exchanged one by one, at least one first connecting branch pipe is arranged between two adjacent second connecting branch pipes in the plurality of second connecting branch pipes, and the plurality of second connecting branch pipes are all connected to the connecting main pipe, so as to transport the heat exchange medium in the connecting main pipe to the parts to be heat exchanged; wherein, at least one first connecting branch pipe has a branch pipe section located in the pipe cavity of the connecting main pipe, and the branch pipe section has a notch, and the direction of the notch is consistent with the flow direction of the heat exchange medium in the connecting main pipe, so as to guide the heat exchange medium to the corresponding second connecting branch pipe through the notch.

[0007] Furthermore, the diversion pipe section includes: a first pipe section, a first opening is provided on the side wall of the first pipe section, and the direction of the first opening is consistent with the flow direction of the heat exchange medium in the connecting main pipe; a second pipe section, which is used to communicate with the heat exchanger, the second pipe section is connected to the first pipe section, and the end of the second pipe section connected to the first pipe section has a second opening, and the first opening and the second opening are connected to each other to form a gap.

[0008] Further, the length of the first opening along the extension direction of the first connecting branch pipe is equal to the diameter of the second pipe section; and / or the cross section of the first pipe section is fan-shaped.

[0009] Furthermore, the end of the first pipe section away from the second pipe section is spaced apart from the inner pipe wall of the connecting main pipe.

[0010] Further, the distance between the end of the first pipe section away from the second pipe section and the inner pipe wall of the connecting main pipe ranges from 5 mm to 10 mm.

[0011] Furthermore, the plane where the first opening is located and the plane where the second opening is located are arranged at an angle.

[0012] Furthermore, the plurality of first communicating branch pipes and the plurality of second communicating branch pipes are alternately arranged in sequence.

[0013] Furthermore, the minimum inner diameter of the connecting main pipe is greater than the maximum outer diameter of the first connecting branch pipe, and the difference between the minimum inner diameter of the connecting main pipe and the maximum outer diameter of the first connecting branch pipe is greater than or equal to 10 mm; and / or the cross section of the connecting main pipe is rectangular or circular.

[0014] According to a second aspect of the utility model, a cooling device is provided, comprising: the above-mentioned oil return pipe structure; a plurality of coolers, wherein a plurality of first connecting branch pipes of the oil return pipe structure are connected to the plurality of coolers in a one-to-one correspondence.

[0015] According to a third aspect of the utility model, a power transformer is provided, comprising: the above-mentioned cooling device; a box body, wherein a plurality of second connecting branch pipes of the oil return pipe structure of the cooling device are connected to the box body.

[0016] Applying the technical solution of the utility model, the utility model provides an oil return pipe structure, a cooling device and a power transformer, wherein the oil return pipe structure comprises: a connecting main pipe; a plurality of first connecting branch pipes, one end of each first connecting branch pipe is connected to the connecting main pipe, and the other end of each first connecting branch pipe is used to connect to the heat exchanger to transport the heat exchange medium in the heat exchanger to the connecting main pipe; a plurality of second connecting branch pipes, which are used to connect to the part to be heat exchanged, at least one first connecting branch pipe is arranged between two adjacent second connecting branch pipes in the plurality of second connecting branch pipes, and the plurality of second connecting branch pipes are all connected to the connecting main pipe to transport the heat exchange medium in the connecting main pipe to the part to be heat exchanged; wherein at least one first connecting branch pipe has a branch pipe section located in the lumen of the connecting main pipe, and the branch pipe section has a notch, and the direction of the notch is consistent with the flow direction of the heat exchange medium in the connecting main pipe, so as to guide the heat exchange medium to the corresponding second connecting branch pipe through the notch. Through the above arrangement, the first connecting branch pipe flows out the heat exchange medium in one direction, so that the heat exchange medium flowing to the part to be heat exchanged can be evenly distributed. In the present application, the part to be heat exchanged may be a box body of a power transformer, thus solving the problem of poor distribution effect of cooling oil in the box body of the power transformer in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram showing the connection between the oil return pipe structure and the main column device according to an embodiment of the power transformer of the utility model is shown;

[0019] Figure 2 A structural schematic diagram of an embodiment of the oil return pipe structure according to the utility model is shown;

[0020] Figure 3 A schematic structural diagram showing a notch of a flow dividing pipe section according to an embodiment of the oil return pipe structure of the utility model is shown;

[0021] Figure 4 The schematic diagram of the structure of the oil return pipe structure according to the embodiment of the utility model is a schematic diagram of the cooperation between the diverter pipe section and the connecting main pipe.

[0022] The above drawings include the following reference numerals:

[0023] 10. connecting main pipe; 20. first connecting branch pipe; 21. branch pipe section; 210. notch; 211. first pipe section; 212. second pipe section; 2110. first opening; 2111. third opening; 2120. second opening; 30. second connecting branch pipe; 200. part to be heat exchanged; 100. heat exchanger; 201. main column device; 40. high voltage winding outlet device. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Please refer to Figures 1 to 4 The utility model provides an oil return pipe structure, comprising: a connecting main pipe 10; a plurality of first connecting branch pipes 20, one end of each of the first connecting branch pipes 20 is connected to the connecting main pipe 10, and the other end of each of the first connecting branch pipes 20 is used to connect to the heat exchanger 100, so as to transport the heat exchange medium in the heat exchanger 100 to the connecting main pipe 10; a plurality of second connecting branch pipes 30, which are used to be connected to a plurality of heat exchange parts 200 in a one-to-one correspondence, and the distance between two adjacent second connecting branch pipes 30 in the plurality of second connecting branch pipes 30 is as long as At least one first connecting branch pipe 20 is provided, and a plurality of second connecting branch pipes 30 are all connected to the connecting main pipe 10 to transport the heat exchange medium in the connecting main pipe 10 to the part to be heat exchanged 200; wherein, at least one first connecting branch pipe 20 has a branch pipe section 21 located in the pipe cavity of the connecting main pipe 10, and the branch pipe section 21 has a notch 210, and the direction of the notch 210 is consistent with the flow direction of the heat exchange medium in the connecting main pipe 10, so as to guide the heat exchange medium to the corresponding second connecting branch pipe 30 through the notch 210. Through the above arrangement, the first connecting branch pipe 20 flows out the heat exchange medium in one direction, so that the heat exchange medium flowing to the part to be heat exchanged 200 can be evenly distributed.

[0026] In the present application, the heat exchange portion 200 may be a box body of a power transformer, thus solving the problem of poor distribution effect of cooling oil in the box body of the power transformer in the prior art.

[0027] like Figure 3As shown, the diversion pipe section 21 includes: a first pipe section 211, a first opening 2110 is provided on the side wall of the first pipe section 211, and the direction of the first opening 2110 is consistent with the flow direction of the connecting main pipe 10; a second pipe section 212, which is used to communicate with the heat exchanger 100, the second pipe section 212 is connected to the first pipe section 211, and the end of the second pipe section 212 connected to the first pipe section 211 has a second opening 2120, the first opening 2110 and the second opening 2120 are connected to each other to form a notch 210, so that the side wall of the first opening 2110 that is arranged opposite to each other can stop the heat exchange medium, so that the notch 210 guides the heat exchange medium to the side where the corresponding part to be heat exchanged 200 is located, so that the heat exchange medium entering the part to be heat exchanged 200 is evenly distributed.

[0028] In the present application, one end of the first pipe section 211 away from the second pipe section 212 has a third opening 2111 to facilitate shot blasting operation.

[0029] like Figure 3 As shown, the length of the first opening 2110 along the extension direction of the first connecting branch pipe 20 is equal to the diameter of the second pipe section 212 to ensure the flow rate of the heat exchange medium; and / or, the cross-section of the first pipe section 211 is fan-shaped, so that the flow rate of the heat exchange medium can be ensured while also ensuring the diversion effect of the branch pipe section.

[0030] In the embodiment of the present application, the cross section of the first pipe section 211 is semicircular, and the central angle corresponding to the first opening 2110 is 180°, so that the flow rate of the heat exchange medium can be guaranteed while also ensuring the diversion effect of the diversion pipe section.

[0031] In the present application, the end of the first pipe section 211 away from the second pipe section 212 is spaced from the inner pipe wall of the connecting main pipe 10. Specifically, the distance between the end of the first pipe section 211 away from the second pipe section 212 and the inner pipe wall of the connecting main pipe 10 ranges from 5 mm to 10 mm, so that during the shot peening process, the distance between the end of the first pipe section 211 away from the second pipe section 212 and the inner pipe wall of the connecting main pipe 10 is greater than the maximum diameter of the steel shot, thereby preventing the connecting main pipe 10 from being blocked.

[0032] In the embodiment of the present application, the plane where the first opening 2110 is located and the plane where the second opening 2120 is located are arranged at an angle. In this way, the flow rate of the heat exchange medium can be ensured while the diversion effect of the diversion pipe section can be ensured to prevent the heat exchange medium from flowing back.

[0033] In an embodiment of the present application, the plane where the first opening 2110 is located and the plane where the second opening 2120 is located are arranged vertically so that the notch 210 is an L-shaped notch. In this way, while ensuring the flow rate of the heat exchange medium, the diversion effect of the diversion pipe section can also be ensured to prevent the backflow of the heat exchange medium.

[0034] Optionally, in the first embodiment of the present application, two first communicating branch pipes 20 are disposed between two adjacent second communicating branch pipes 30 among the plurality of second communicating branch pipes 30 , and the notches 210 of the two first communicating branch pipes 20 face in opposite directions.

[0035] In the second embodiment of the present application, a plurality of first connecting branch pipes 20 and a plurality of second connecting branch pipes 30 are arranged alternately in sequence, and the notches 210 of some of the first connecting branch pipes 20 are respectively arranged toward a corresponding second connecting branch pipe 30. Through the above arrangement, a first connecting branch pipe 20 is arranged between two adjacent second connecting branch pipes 30 among the plurality of second connecting branch pipes 30, so that the shot peening operation of the oil return pipe structure is convenient and the shot peening is smooth.

[0036] In the embodiment of the present application, the second connecting branch pipe 30 is only provided on one side of the outermost first connecting branch pipe 20. Therefore, the outermost first connecting branch pipe 20 does not need to be provided with a branch pipe section 21 and a notch, thereby reducing the manufacturing steps of the entire oil return pipe structure.

[0037] In the present application, the minimum inner diameter of the connecting main pipe 10 is greater than the maximum outer diameter of the first connecting branch pipe 20, and the difference between the minimum inner diameter of the connecting main pipe 10 and the maximum outer diameter of the first connecting branch pipe 20 is greater than or equal to 10 mm, so as to prevent the steel shots from getting stuck during shot peening, causing the steel shots to enter the transformer with the oil flow during later operation; and / or, the cross-section of the connecting main pipe 10 is rectangular or circular.

[0038] In a preferred embodiment of the present application, the cross-section of the connecting main pipe 10 is rectangular, so that the distance between the branch pipe section 21 and the connecting main pipe 10 is equidistantly distributed, which facilitates the shot peening operation and prevents steel shot clogging during shot peening.

[0039] Optionally, the heat exchanger 100 of the present application may be a cooler or a heater, and the heat exchange medium may be heating oil or cooling oil.

[0040] The utility model also provides a cooling device, comprising: the above-mentioned oil return pipe structure; a plurality of coolers, wherein a plurality of first connecting branch pipes 20 of the oil return pipe structure are connected to the plurality of coolers in a one-to-one correspondence.

[0041] Optionally, the cooler is an air-cooled cooler, which is used to cool the heat exchange medium to form cooling oil; or, the cooler is a water-cooled cooler, so that the heat exchange medium cooled by the water-cooled cooler forms cooling oil.

[0042] Please refer to Figure 1 The utility model also provides a power transformer, comprising: the above-mentioned cooling device; a box body, and a plurality of second connecting branch pipes 30 of the oil return pipe structure of the cooling device are connected to the box body.

[0043] Specifically, the power transformer includes multiple main column devices 201, which are all arranged in the box body and are arranged at intervals; wherein the heat exchange medium in the multiple second connecting branch pipes 30 of the return oil pipe structure flows to a corresponding main column device 201 respectively to cool the main column device 201.

[0044] In the present application, the power transformer includes a high-voltage winding outgoing line device 40 , and the high-voltage winding outgoing line device 40 is connected to at least one main column device 201 among a plurality of main column devices 201 .

[0045] In the second embodiment of the present application, a first connecting branch pipe 20 is arranged between two adjacent second connecting branch pipes 30 among the multiple second connecting branch pipes 30, and each first connecting branch pipe 20 is located on the side of the corresponding second connecting branch pipe 30 away from the high-voltage winding outlet device 40, so that the structural distribution between the high-voltage winding outlet device 40, the return oil pipe structure and the heat exchanger 100 is reasonable.

[0046] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0047] The utility model provides an oil return pipe structure, a cooling device and a power transformer, wherein the oil return pipe structure comprises: a connecting main pipe 10; a plurality of first connecting branch pipes 20, one end of each of the first connecting branch pipes 20 is connected to the connecting main pipe 10, and the other end of each of the first connecting branch pipes 20 is used to connect to a heat exchanger 100, so as to transport the heat exchange medium in the heat exchanger 100 to the connecting main pipe 10; a plurality of second connecting branch pipes 30, which are used to be connected to a plurality of heat exchange parts 200 in a one-to-one correspondence, and two adjacent second connecting branch pipes 30 in the plurality of second connecting branch pipes 30 are connected to each other. At least one first connecting branch pipe 20 is arranged between the connecting branch pipes 30, and the plurality of second connecting branch pipes 30 are all connected to the connecting main pipe 10 to transport the heat exchange medium in the connecting main pipe 10 to the part to be heat exchanged 200; wherein, at least one first connecting branch pipe 20 has a branch pipe section 21 located in the tube cavity of the connecting main pipe 10, and the branch pipe section 21 has a notch 210, and the direction of the notch 210 is consistent with the flow direction of the heat exchange medium in the connecting main pipe, so as to guide the heat exchange medium to the corresponding second connecting branch pipe 30 through the notch 210. Through the above arrangement, the first connecting branch pipe 20 flows out the heat exchange medium in one direction, so that the heat exchange medium flowing to the part to be heat exchanged 200 can be evenly distributed. In the present application, the part to be heat exchanged 200 can be the box of the power transformer, so that the problem of poor distribution effect of cooling oil in the box of the power transformer in the prior art is solved.

[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An oil return pipe structure, characterized in that: include: Connecting main pipe (10); a plurality of first connecting branch pipes (20), one end of each of the first connecting branch pipes (20) being connected to the connecting main pipe (10), and the other end of each of the first connecting branch pipes (20) being used to be connected to the heat exchanger (100) so as to transport the heat exchange medium in the heat exchanger (100) to the connecting main pipe (10); a plurality of second connecting branch pipes (30) for connecting to the parts to be heat exchanged (200) in a one-to-one correspondence, at least one of the first connecting branch pipes (20) being arranged between two adjacent second connecting branch pipes (30) among the plurality of second connecting branch pipes (30), and the plurality of second connecting branch pipes (30) being connected to the connecting main pipe (10) so as to transport the heat exchange medium in the connecting main pipe (10) to the parts to be heat exchanged (200); At least one of the first connecting branch pipes (20) has a branch pipe section (21) located in the pipe cavity of the connecting main pipe (10), and the branch pipe section (21) has a notch (210). The direction of the notch (210) is consistent with the flow direction of the heat exchange medium in the connecting main pipe (10), so as to guide the heat exchange medium to the corresponding second connecting branch pipe (30) through the notch (210).

2. The oil return pipe structure according to claim 1, characterized in that: The diversion pipe section (21) comprises: A first pipe section (211), wherein a first opening (2110) is provided on a side wall of the first pipe section (211), and the direction of the first opening (2110) is consistent with the flow direction of the heat exchange medium in the connecting main pipe (10); A second pipe section (212) is used for communicating with the heat exchanger (100); the second pipe section (212) is connected to the first pipe section (211); the end of the second pipe section (212) connected to the first pipe section (211) has a second opening (2120); the first opening (2110) and the second opening (2120) are connected to each other to form the notch (210).

3. The oil return pipe structure according to claim 2, characterized in that: The length of the first opening (2110) along the extension direction of the first connecting branch pipe (20) is equal to the diameter of the second pipe section (212); and / or, The cross section of the first pipe section (211) is fan-shaped.

4. The oil return pipe structure according to claim 2, characterized in that: The end of the first pipe section (211) away from the second pipe section (212) is spaced apart from the inner pipe wall of the connecting main pipe (10).

5. The oil return pipe structure according to claim 4, characterized in that: The distance between the end of the first pipe section (211) away from the second pipe section (212) and the inner pipe wall of the connecting main pipe (10) ranges from 5 mm to 10 mm.

6. The oil return pipe structure according to claim 2, characterized in that: The plane where the first opening (2110) is located and the plane where the second opening (2120) is located are arranged at an angle.

7. The oil return pipe structure according to any one of claims 1 to 6, characterized in that: A plurality of the first communicating branch pipes (20) and a plurality of the second communicating branch pipes (30) are arranged alternately in sequence.

8. The oil return pipe structure according to any one of claims 1 to 6, characterized in that: The minimum inner diameter of the connecting main pipe (10) is greater than the maximum outer diameter of the first connecting branch pipe (20), and the difference between the minimum inner diameter of the connecting main pipe (10) and the maximum outer diameter of the first connecting branch pipe (20) is greater than or equal to 10 mm; and / or, The cross section of the connecting main pipe (10) is rectangular or circular.

9. A cooling device, characterized in that: include: The oil return pipe structure according to any one of claims 1 to 8; A plurality of coolers are provided, and the plurality of first connecting branch pipes (20) of the oil return pipe structure are connected to the plurality of coolers in a one-to-one correspondence.

10. A power transformer, characterized in that: include: The cooling device according to claim 9; A box body, and a plurality of second connecting branch pipes (30) of the oil return pipe structure of the cooling device are all connected to the box body.

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