Chip heat dissipation structure of new energy oil-immersed transformer

Abstract

The present invention discloses a sheet heat dissipation structure of a new energy oil-immersed transformer, which relates to the technical field of transformer heat dissipation. The sheet heat dissipation structure comprises an oil inlet elbow, an upper oil collecting pipe, an upper oil collecting pipe, a lower oil collecting pipe with an internal welded baffle, a lower oil collecting pipe, an oil outlet straight pipe and a heat sink arranged between the upper and lower oil collecting pipes and respectively connected with the upper and lower oil collecting pipes; the other end of the upper oil collecting pipe is respectively connected with a plurality of upper oil collecting pipes by welding; a plurality of lower oil collecting pipes are welded and connected with the lower oil collecting pipe, and the equivalent diameter of the lower oil collecting pipe is smaller than the equivalent diameter of the lower oil collecting pipe. Compared with the existing heat sink structure of the oil-immersed transformer, the structural design of the present invention is more reasonable. By arranging an oil outlet near the outer 1 / 3 of the lower oil collecting pipe, the oil circulation can be effectively improved, the heat dissipation effect of the sheet heat sink can be effectively improved, and the temperature difference of the hot oil entering each group of heat sinks can be reduced, thereby extending the service life of the equipment and improving the market competitiveness.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation equipment for power transformers, and in particular to a sheet-type heat dissipation structure for a new energy oil-immersed transformer. Background Art

[0002] When large and medium-sized transformers are in operation, losses will occur in the internal windings and low-voltage lead wires, which will be converted into heat and transferred to the surrounding medium through the heat conduction and heat convection of the transformer oil, causing the temperature of the core, windings and tank wall to continue to rise. The high temperature accelerates the aging of the transformer insulation, which seriously affects the service life of the transformer. In addition, during the heat conduction process, the heat on the top layer of the oil in the transformer tank will accumulate, causing tumbling, and the temperature must be controlled within a reliable range. The plate radiator has the characteristics of simple structure, easy manufacturing, large heat dissipation area and excellent performance, and is widely used as a heat dissipation component for oil-immersed transformers.

[0003] The plate radiator is composed of multiple fins, each of which is welded together by two steel plates, and each group of fins is composed of multiple fins welded with upper and lower oil collecting pipes. Compared with other heat dissipation structures, the plate radiator can reduce the number of oil tank openings and welding workload, while having a larger heat dissipation area. The current transformer plate heat dissipation structure mainly connects the upper and lower oil collecting pipes of each group of fins directly to the outer wall flange of the transformer oil tank. Due to the different heating conditions of the transformer body at the connection position of the upper oil collecting pipe, the temperature rise of the transformer oil in the upper oil collecting pipe of the plate radiator at different connection positions is quite different, which in turn affects the heat dissipation effect of the plate radiator. At the same time, the transformer oil in the oil tank heats up and rolls upward, then falls and enters the upper oil collecting pipe, which increases a part of the oil resistance and also affects the heat dissipation effect of the transformer; furthermore, the oil circulation path of the inner heat sink is shorter than that of the outer heat sink, resulting in different cooling effects of heat sinks at different positions, which indirectly affects the overall heat dissipation effect. The current heat sink structure (such as Figure 3 The heat sink shown in (a) and (b) is already quite mature, and the cost of developing a new heat sink is relatively expensive. The heat dissipation effect of the plate heat sink is generally improved by increasing the heat dissipation area and increasing the production cost.

[0004] At present, in response to some of the above technical problems, a distribution transformer with good contact is disclosed in the announcement number CN219226021U, which discloses a U-shaped lower oil collecting pipe to improve the circulating oil circuit, such as Figure 3As shown in (c), this structure makes the heat dissipation path length of the heat sinks at different positions the same, but the problem is that the sheet-dispersed structure increases by about 50 mm in the width direction, which causes the width of the transformer oil tank to increase by about 100 mm, affecting the outer limit size of the transformer transportation; and, in this sheet-dispersed structure, the oil inlet of the oil tank is lowered, which will lower the heat dissipation center of the sheet-type radiator by about 50 mm in the height direction, causing the top layer oil temperature to increase by about 1K or more; at the same time, when the return oil confluence point is set at the outermost side, when the oil in the inner and outer sheet-dispersed oils converge at the lower oil collecting pipe, the flow rate is different due to the temperature difference, resulting in a certain blockage phenomenon.

[0005] Based on the above-mentioned practical situation, it is necessary to provide a plate-type heat sink which can optimize the heat sink structure and improve the heat dissipation effect of the heat sink. Summary of the invention

[0006] The purpose of the present invention is to provide a plate-type heat dissipation structure for a new energy oil-immersed transformer, optimize the oil circuit structure, make each group of plate-type radiators dissipate heat relatively fully, and thus improve the heat dissipation efficiency of the entire plate-type radiator.

[0007] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0008] A sheet heat dissipation structure of a new energy oil-immersed transformer, comprising an oil inlet elbow, an upper oil collecting pipe, a lower oil collecting pipe, an oil outlet pipe, and a group of heat dissipation sheets respectively connected to the upper oil collecting pipe and the lower oil collecting pipe, wherein the upper oil collecting pipe is connected to the transformer oil tank through the oil inlet elbow, and the lower oil collecting pipe is connected to the transformer oil tank through the oil outlet pipe;

[0009] It also includes an upper oil collecting pipe and a lower oil collecting pipe. The upper oil collecting pipe is perpendicular to the upper oil collecting pipe and is connected to multiple oil inlet elbows and multiple upper oil collecting pipes at the same time. The lower oil collecting pipe is arranged below the lower oil collecting pipe and is connected to multiple oil outlet pipes at the same time.

[0010] An oil outlet is provided at 1 / 3 of the outer side of the lower oil collecting pipe, and a baffle is provided inside the oil outlet to separate the lower oil collecting pipe into two parts. The baffle can avoid the problem of merging and blocking of the hot oil scattered inside and the cold oil scattered outside.

[0011] The oil inlet elbow has a bending angle of 90°, one end of which is connected to the oil tank cover or the upper end of the oil tank side wall through an upper flange, and the other end is connected to the upper oil collecting pipe through welding at the edge; the other end of the upper oil collecting pipe is provided with multiple openings that are connected to multiple upper oil collecting pipes respectively;

[0012] The oil outlet of the lower oil collecting pipe is connected with the lower oil collecting pipe; the other end of the lower oil collecting pipe is connected with a plurality of oil outlet pipes through edge welding; and the plurality of oil outlet pipes are connected to the oil tank wall through the tank wall flange.

[0013] After the hot oil of the transformer rolls upward in the oil tank, it directly enters multiple oil inlet elbows, then flows into the upper oil collecting pipe for mixing, and then flows into the upper oil collecting pipe respectively, and then flows into the lower oil collecting pipe after being cooled by the heat sink. The transformer oil of multiple oil collecting pipes is mixed in the lower oil collecting pipe, and then flows into the lower oil outlet pipe to enter the oil tank. In a specific embodiment, the oil outlet pipe can also be replaced by an oil outlet elbow.

[0014] Furthermore, there is a support rod between the upper oil pipe and the lower oil pipe, an extension plate is welded on the support rod, an extension plate is welded on the outer wall of the oil tank, and the support rod and the extension plate are connected through a support flange. The support rod provides effective support for the fin-type radiator and the upper and lower oil pipes to meet the mechanical strength requirements for long-distance transportation or vibration testing.

[0015] Furthermore, the number of openings of the upper oil pipe and the lower oil pipe is consistent with the number of the oil inlet elbow and the oil outlet pipe. There is only one upper oil pipe and one lower oil pipe respectively, and the cross-section is rectangular or circular; the upper oil pipe is connected to the oil tank through the oil inlet elbow.

[0016] The equivalent diameter of the upper oil pipe is greater than the equivalent diameter of the oil inlet elbow, and the equivalent diameter of the lower oil pipe is greater than the equivalent diameter of the oil outlet pipe.

[0017] The bending radius of the oil inlet elbow is the same. There are two ways to manufacture the oil inlet elbow. The first way is to weld three parts, specifically including: the 90° pipe fitting part of the oil inlet elbow is directly formed by sand casting; the straight pipe parts on both sides are respectively welded to the bent pipe fittings and connected thereto; the second way: the entire oil inlet elbow is formed by heating and bending the metal pipe fittings.

[0018] Furthermore, the connections between the oil inlet elbow and the upper oil pipe, the upper oil pipe and the upper oil collecting pipe, the lower oil collecting pipe and the lower oil pipe, and the lower oil pipe and the oil outlet pipe are all achieved by welding;

[0019] A baffle is welded inside the lower oil collecting pipe at 1 / 3 of the distance from the outer side, and the diameter of the baffle is equal to the pipe diameter, so that the scattered oil flows on both sides of the baffle can enter the oil tank along the shortest path to participate in the cooling cycle; further, the lower end of the baffle extends toward the oil outlet to improve the partition effect.

[0020] Furthermore, the upper oil collecting pipe is inclined downward toward the outside, and the lower oil collecting pipe is inclined upward toward the upper outside. The height of the heat sink decreases from the inside to the outside. The inclination angle of the upper oil collecting pipe or the lower oil collecting pipe is between 2-6 degrees. This structure is conducive to further reducing the isothermal height difference between the inner and outer heat sinks.

[0021] Furthermore, the lower oil collecting pipe is arranged directly below the oil outlet, and is connected to the oil tank through the oil outlet pipe, which accelerates the mixing of the oil in the inner and outer dissipators and the dissipators in different groups, while effectively utilizing the lower space of the upwardly inclined lower oil collecting pipe to maximize the dissipation area and improve the heat dissipation effect.

[0022] The beneficial effects of the present invention are as follows: first, due to the structure of adding an upper oil pipe between the upper part of the oil tank and the plate-type radiator, the hot oil in the oil tank can flow into the oil inlet elbow after rolling over the top layer of the oil; second, the equivalent diameter of the upper oil pipe is larger than the equivalent diameter of the oil inlet elbow, so that the flow velocity of the hot oil is reduced when flowing through the upper oil pipe, and the hot oil is fully mixed in the upper oil pipe, thereby reducing the temperature difference of the oil entering each group of plate-type radiators; third, the equivalent diameter of the upper oil pipe is larger than the equivalent diameter of the upper oil pipe, and the flow velocity of the transformer oil flowing into the heat sink is increased, thereby improving the cooling effect of the oil in the heat sink; fourth, the equivalent diameter of the lower oil pipe is smaller than the equivalent diameter of the lower oil pipe, and the flow velocity of the cooled transformer oil is reduced when flowing from the lower oil pipe into the lower oil pipe, and the lower oil pipe An oil outlet is set at 1 / 3, so that the scattered oil flows on both sides of the baffle can flow along the shortest path, and the cooled oil can be fully mixed in the lower oil pipe to balance the cooling effect; fifth, the equivalent diameter of the lower oil pipe is larger than the equivalent diameter of the oil outlet pipe. The flow rate increases when the oil enters the oil outlet pipe, so that the cooled oil enters the oil tank more quickly to participate in the heat dissipation of the transformer body and windings, thereby reducing the aging rate of the insulation and ensuring that the transformer has a guaranteed service life; a baffle is set at the oil outlet of the lower oil collecting pipe to effectively separate the inner and outer oil collecting pipelines, avoid conflicts in the flow rates of the inner and outer oil liquids, and help improve the heat dissipation efficiency. Compared with the existing scattered structure of oil-immersed transformers, the structural design is more reasonable, the isotherms of the inner and outer scattered sheets are more horizontal, and the heat dissipation efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of Embodiment 1 of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of a top view structure;

[0025] Figure 3 It is a schematic diagram of the existing oil-immersed transformer scattered structure;

[0026] Figure 4 It is a schematic diagram of the structure of other embodiments of the present invention.

[0027] 1-oil inlet elbow, 2-upper oil collection pipe, 3-upper oil collecting pipe, 4-heat sink, 5-lower oil collecting pipe, 6-lower oil collection pipe, 7-oil outlet pipe, 71-oil outlet elbow, 8-tank wall flange, 9-upper flange, 10-support rod, 11-extended plate, 12-support flange, 13-extension plate, 14-baffle. DETAILED DESCRIPTION

[0028] The following is a detailed description by way of embodiments. Any merely formal changes made based on the concept of the present invention are considered to be within the scope of the technical solution of the present invention.

[0029] Generally, a conventional transformer oil tank is provided with three oil outlet pipes and three sets of loose-pack structures, but other numbers of structures are not excluded.

[0030] Embodiment 1, as Figure 1 and Figure 2 The sheet heat dissipation structure of a new energy oil-immersed transformer shown in the figure comprises an oil inlet elbow 1, an upper oil collecting pipe 2, an upper oil collecting pipe 3, a lower oil collecting pipe 5, a lower oil collecting pipe 6, an oil outlet pipe 7 and a group of heat sinks 4 arranged between the upper oil collecting pipe 3 and the lower oil collecting pipe 5 and connected thereto. One end of the oil inlet elbow 1 is respectively connected to the oil tank cover through an upper flange 9, and the other end is respectively welded to the upper oil collecting pipe 2 through the edge; three openings at the other end of the upper oil collecting pipe 2 are respectively connected to the upper oil collecting pipe 3, and the upper oil collecting pipe 3 is connected to the lower oil collecting pipe 5 through the heat sink 4; the lower The other end of the oil collecting pipe 5 is connected to the lower oil collecting pipe 6 by edge welding; a baffle 14 with the same diameter as the lower oil collecting pipe is welded inside the lower oil collecting pipe 5 at 1 / 3 of the distance from the outer plate to improve the blocking of the cold oil on the outer plate side of the inner plate heat dissipation oil; the lower oil collecting pipe 5 is a special structure, and the pipe is welded by two parts: a transverse pipe welded to each plate and a bent pipe welded to the lower oil collecting pipe; the other end of the lower oil collecting pipe 6 is connected to the oil outlet pipe 7 by edge welding; the oil outlet pipe 7 is connected to the oil tank wall through the tank wall flange 8 and is connected to the oil tank. The hot oil of the transformer rolls upward in the oil tank and directly enters the oil inlet elbow 1, then flows into the upper oil collecting pipe 2 for mixing, and then flows into the upper oil collecting pipe 3, and then flows into the lower oil collecting pipe 5 after being cooled by the heat sink 4. The transformer oil in the lower oil collecting pipe 5 is mixed in the lower oil collecting pipe 6 and then flows into the oil outlet pipe 7 to enter the oil tank. There is a support rod 10 between the upper oil manifold 2 and the lower oil manifold 6 , an extension plate 11 is welded to the support rod 10 , an extension plate 13 is welded to the outer wall of the oil tank, and the extension plate 11 and the extension plate 13 are connected via a support flange 12 .

[0031] Furthermore, the number of openings of the upper and lower oil manifolds is consistent with the number of the oil inlet elbow and the oil outlet pipe, and there is only one upper and lower oil manifold respectively, and the cross-section is either rectangular or circular; the upper oil manifold is connected to the oil tank through the oil inlet elbow. The equivalent diameter of the upper oil manifold is greater than the equivalent diameter of the oil inlet elbow, and the equivalent diameter of the lower oil manifold is greater than the equivalent diameter of the oil inlet straight pipe.

[0032] Furthermore, the oil inlet elbow 1 has a bending angle of 90°, and the bending radius of each oil inlet elbow 1 is the same. The oil inlet elbow can be manufactured in two ways. The first way is that it is welded from three parts, specifically including: the 90° pipe fitting part of the oil inlet elbow is directly formed by sand casting; the straight pipe parts on both sides are respectively welded to the bent pipe fittings and connected thereto; the second way: the entire oil inlet elbow 1 is formed by heating and bending the metal pipe fittings.

[0033] Furthermore, the equivalent diameters of the upper oil collecting pipe 2 and the lower oil collecting pipe 6 are respectively larger than the equivalent diameters of the upper oil collecting pipe 3 and the lower oil collecting pipe 5 .

[0034] Furthermore, the connections between the oil inlet elbow 1 and the upper oil collecting pipe 2, the upper oil collecting pipe 2 and the upper oil collecting pipe 3, the lower oil collecting pipe 5 and the lower oil collecting pipe 6, and the lower oil collecting pipe 6 and the oil outlet pipe 7 are all achieved by welding.

[0035] Furthermore, the oil outlet pipe 7 may also be replaced by an oil outlet elbow 71 .

[0036] Furthermore, the other end of the lower oil collecting pipe 5 is connected to the lower oil collecting pipe 6 by edge welding; a baffle 14 with the same diameter as the lower oil collecting pipe is welded inside the lower oil collecting pipe 5 at a distance of 1 / 3 from the outer plate; the lower oil collecting pipe 5 is a special structure, and the pipe fitting is welded from two parts: a transverse pipe welded to each plate and a bent pipe welded to the lower oil collecting pipe.

[0037] Embodiment 2, as Figure 4 As shown in Figures (d) and (e), compared with Example 1, the main structural difference is that the upper oil collecting pipe 3 and the lower oil collecting pipe 5 are inclined, and the inclination angle is between 2-6°, which is conducive to further reducing the isothermal height difference between the inner and outer heat sinks. This structure is combined with the oil collecting pipe structure and the oil outlet position after optimization, so as to improve the heat dissipation efficiency of the entire heat sink; in addition, the lower oil collecting pipe 6 is arranged at a position directly below the oil outlet to accelerate the mixing of the inner and outer heat sinks and the oil of different groups of heat sinks, and at the same time effectively utilize the lower space of the upwardly inclined lower oil collecting pipe to maximize the heat sink area and improve the heat dissipation effect. According to actual product needs, the oil inlet elbow 1 in Example 2 is connected to the tank cover or to the side wall of the tank.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.

Claims

1. A sheet heat dissipation structure for a new energy oil-immersed transformer, comprising an oil inlet elbow, an upper oil collecting pipe, a lower oil collecting pipe, an oil outlet pipe, and a group of heat sinks connected to the upper oil collecting pipe and the lower oil collecting pipe, respectively. The upper oil collecting pipe is connected to the transformer oil tank through the oil inlet elbow, and the lower oil collecting pipe is connected to the transformer oil tank through the oil outlet pipe. The structure is characterized in that: It also includes an upper oil collecting pipe and a lower oil collecting pipe. The upper oil collecting pipe is perpendicular to the upper oil collecting pipe and is connected to multiple oil inlet elbows and multiple upper oil collecting pipes at the same time. The lower oil collecting pipe is arranged below the lower oil collecting pipe and is connected to multiple oil outlet pipes at the same time. An oil outlet is provided at 1 / 3 of the outer side of the lower oil collecting pipe and is connected to the oil outlet pipe. A baffle is provided inside the oil outlet to separate the lower oil collecting pipe into two parts. A baffle is welded inside the lower oil collecting pipe at 1 / 3 of the distance from the outside. The diameter of the baffle is equal to the pipe diameter, so that the scattered oil flow on both sides of the baffle can enter the oil tank along the shortest path to participate in the cooling cycle; There is a support rod between the upper oil pipe and the lower oil pipe, an extension plate is welded on the support rod, an extension plate is welded on the outer wall of the oil tank, the support rod and the extension plate are connected by a support flange, and the support rod effectively supports the fin radiator and the upper and lower oil pipes.

2. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The oil inlet elbow has a bending angle of 90°, one end of which is connected to the oil tank cover or the upper end of the oil tank side wall through an upper flange, and the other end is connected to the upper oil collecting pipe through welding at the edge; the other end of the upper oil collecting pipe is provided with multiple openings that are connected to multiple upper oil collecting pipes respectively; The oil outlet of the lower oil collecting pipe is connected with the lower oil collecting pipe; the other end of the lower oil collecting pipe is connected with a plurality of oil outlet pipes through edge welding; and the plurality of oil outlet pipes are connected to the oil tank wall through the tank wall flange.

3. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The number of openings of the upper oil pipe and the lower oil pipe is consistent with the number of the oil inlet elbow and the oil outlet pipe. There is only one upper oil pipe and one lower oil pipe respectively, and the cross-section is rectangular or circular; the upper oil pipe is connected to the oil tank through the oil inlet elbow.

4. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The equivalent diameter of the upper oil pipe is greater than the equivalent diameter of the oil inlet elbow, and the equivalent diameter of the lower oil pipe is greater than the equivalent diameter of the oil outlet pipe.

5. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The lower end of the baffle extends toward the oil outlet to improve the partition effect.

6. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The upper oil collecting pipe is inclined downward toward the outside, and the lower oil collecting pipe is inclined upward toward the upper outside. The heat sink decreases in height from the inside to the outside, and the inclination angle of the upper oil collecting pipe or the lower oil collecting pipe is between 2-6 degrees.

7. The sheet heat dissipation structure of the new energy oil-immersed transformer according to claim 1 is characterized in that: The lower oil manifold is arranged directly below the oil outlet.

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