A detachable plate-type radiator to enhance heat exchange.

Abstract

This invention relates to a detachable plate-type radiator heat exchange enhancement device, comprising a top-to-bottom air intake box, an enhanced heat transfer unit, and a wind deflector system. The air intake box is fixedly connected to the top of the enhanced heat transfer unit. The enhanced heat transfer unit is evenly arranged on both sides of each radiator fin along the direction of the radiator's oil collection pipe. Each enhanced heat transfer unit includes a fixed frame, fin baffles, and turbulence-inducing fins arranged on the fin baffles. The wind deflector system includes a baffle plate, a connecting rod groove, a connecting rod, and an automatic spring-loaded structure. Compared with the prior art, this invention has advantages such as strengthening the radiator's self-suction effect, enhancing surface convection heat transfer, reducing transformer oil temperature, and extending transformer life.

Description

Technical Field

[0001] This invention relates to a heat dissipation enhancement device, and more particularly to a detachable plate radiator heat exchange enhancement device. Background Technology

[0002] In recent years, with the increase in industrial power consumption, transformer loads have been continuously rising. The trend towards lighter and smaller transformers dictates a continuous reduction in their size and weight, leading to a continuous increase in the heat generation rate per unit volume of the internal windings. Under the condition that the transformer's heat dissipation performance remains unchanged, the transformer temperature will continue to rise. Excessive transformer temperature not only increases transmission losses but also accelerates the aging of the transformer's insulation materials, shortening the transformer's service life.

[0003] Oil-immersed transformers remain widely used due to their advantages of low heat loss, large capacity, and low price. Medium and large oil-immersed transformers commonly use plate-type radiators for cooling, and their heat dissipation performance is mainly affected by the external airflow velocity and the surface area of ​​the heat dissipation radiator. While increasing the effective heat dissipation area of ​​the plate-type radiator can improve the overall heat dissipation performance of the transformer to some extent, it also increases the floor space required. Alternatively, the heat dissipation performance of the plate-type radiator can be improved through fans and oil pumps, but these auxiliary devices often generate significant noise, have a high failure rate, and require regular maintenance. Therefore, under the premise of meeting heat dissipation requirements, oil self-circulation self-cooling (ONAN) cooling is more favored by enterprises.

[0004] Due to historical and social reasons, my country's power grid system contains a large number of power transformers that have been in use for many years. Although various new types of transformers have emerged, due to cost and difficulty in replacement, a large number of self-cooled plate radiators will continue to be used for a considerable period of time. Therefore, it is necessary to retrofit these old devices at a low cost. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art by providing a detachable plate radiator to enhance heat exchange.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a detachable plate radiator heat exchange enhancement device is provided, comprising an exhaust box, an enhanced heat transfer unit, and a wind deflector system arranged from top to bottom. The exhaust box is connected and fixed to the top of the enhanced heat transfer unit. The enhanced heat transfer unit is evenly arranged on both sides of each heat transfer plate along the direction of the oil collection pipe of the radiator. The enhanced heat transfer unit includes a fixed frame, a fin baffle, and turbulence-deflecting fins arranged on the fin baffle. The wind deflector system includes a wind deflector plate, a connecting rod groove, a connecting rod, and an automatic spring-loaded structure.

[0008] As a preferred technical solution, the fixed frame is composed of two identical sub-frames spliced ​​together, which are fixed by top bolts and symmetrically laid on both sides of the upper oil collection pipe of the radiator. The bottom crossbar of the fixed frame is fixed by connecting sleeves.

[0009] As a preferred technical solution, the fixed frame has through holes on both sides.

[0010] As a preferred technical solution, the wing-shaped stop bar is connected and fixed through the side through hole of the fixed frame, and the wing-shaped stop bar is rotatable.

[0011] As a preferred technical solution, the spoiler blades are arranged on the blade stop; the spoiler blades are made of metal or plastic, and plastic spoiler blades are fixed with pins, while metal spoiler blades are fixed by welding; the spoiler blades are triangular wings, rectangular wings, or other irregular shapes; the angle of attack β of the spoiler blades is controlled by rotating the blade stop.

[0012] As a preferred technical solution, the air duct has fixed interfaces on both sides for connecting and fixing to the fixed frame; the tilt angle α of the air duct varies between 45 and 90° to adapt to the heat dissipation requirements of different types of finned heat sinks; the height L of the air duct is 1 / 4 to 1 / 2 of the heat sink height to ensure a certain heat exchange performance while occupying the minimum space.

[0013] As a preferred technical solution, both ends of the connecting rod are provided with bosses, the top is connected to the air box through a connecting rod groove, and the bottom is provided with a pair of spring stop rods.

[0014] As a preferred technical solution, the connecting rod groove is cylindrical, with one end having a diameter equal to the connecting rod diameter and the other end having a diameter the same as the connecting rod boss diameter. The connecting rod groove and the induced draft box are connected by a threaded connection or a pin connection.

[0015] As a preferred technical solution, the wind baffle is fixed to both sides of the heat sink by a connecting rod; the length M of the wind baffle is the same as the height of the heat sink, and the width W of the wind baffle is slightly smaller than the spacing between the heat sinks while ensuring its free rotation.

[0016] As a preferred technical solution, the automatic rebound structure includes a sleeve and a spring. The top of the spring is fixed to the sleeve by welding, and the bottom is fixed by a spring stop bar provided on the connecting rod. The bottom of the sleeve is connected to the fixed connecting rod by welding or threaded connection.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1) This invention uses a uniformly arranged fixed frame and fin baffles to fix the flow-enhancing fins at a certain distance from the wall of the plate radiator. Scholars have demonstrated that, compared to directly fixing the flow-enhancing fins to the plate radiator wall through welding or stamping, the separate arrangement provides better heat transfer enhancement. The draft box at the top of the radiator is based on the chimney effect, utilizing the density difference between the bottom and top of the radiator to draw cold air from the ground upwards along the fins. This structure accelerates the airflow outside the plate radiator wall without additional energy input, thereby increasing the convective heat transfer coefficient on the air side of the radiator. Furthermore, the rotatable fin baffles can change the angle of attack of the fins, thus adapting to different airflow velocities and ensuring the fins maintain the highest enhanced heat transfer performance. In addition, the chimney structure's top has a certain angle of inclination, which can also suppress the cold inflow phenomenon generated in traditional chimney structures to some extent.

[0019] 2) The heat exchange enhancement device of this invention has strong adaptability to various operating conditions. When the radiator operates in air-cooled (AN) mode, due to the limitation of the automatic rebound structure, the baffle plate is perpendicular to the heat sink fins, forming a long chimney channel together with the top air box, generating a strong self-suction effect. The baffle plate also prevents air from entering from the side, allowing as much cold air as possible to enter from the bottom of the radiator, thus maximizing the enhanced heat exchange capacity of the surrounding fins. When the transformer load increases and the radiator operates in air-cooled (AF) mode, the baffle plate rotates to be parallel to the heat sink fins under the action of the fan, at which point the obstruction effect on the airflow is minimized.

[0020] 3) This invention has a simple structure and is easy to assemble and disassemble. The enhanced heat dissipation components are suspended in the air by a fixed frame, without requiring any changes to the existing plate heat sinks. In addition, since this invention uses a passive enhanced heat transfer method, it does not require additional energy consumption.

[0021] 4) Most of the materials used in this invention can be made of high-density plastic, and the metal parts are only standard bolts and connecting rods, etc., which reduces costs and manufacturing difficulty. In addition, the use of plastic for the fan box can generate a larger temperature difference, which also has a positive effect on heat dissipation performance. Attached Figure Description

[0022] Figure 1 This is an axonometric schematic diagram of one embodiment of the present invention;

[0023] Figure 2 This is a front view of an embodiment of the present invention;

[0024] Figure 3 This is a side view of an embodiment of the present invention;

[0025] Figure 3 (1) is Figure 3Enlarged detail of part A in the image;

[0026] Figure 3 (2) is Figure 3 Enlarged detail of part B in the image;

[0027] Figure 4 for Figure 3 (2) Schematic diagram of component (12);

[0028] Figure 5 This is a top view of one embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of an enhanced heat transfer unit according to an embodiment of the present invention;

[0030] Figure 6 (1) is Figure 6 Enlarged detail of part C in the image;

[0031] Figure 6 (2) is Figure 6 Enlarged detail of part D in the image;

[0032] Figure 6 (3) Figure 6 Enlarged detail of part E in the image;

[0033] In the diagram, 1: air intake box; 2: upper oil collection pipe; 3: fixed frame; 4: spoiler vane; 5: wind deflector; 6: connecting sleeve; 7: top bolt; 8: vane stop bar; 9: fixed interface; 10: connecting rod groove; 11: connecting rod; 12: sleeve; 13: spring; 14: spring stop bar; 15: fixed connecting rod. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] like Figure 1 As shown, a detachable finned radiator enhanced heat exchange device includes an exhaust box 1, enhanced heat transfer units, and a baffle adjustment system arranged from top to bottom. The exhaust box 1 is connected and fixed to the top of the enhanced heat transfer units. The enhanced heat transfer units are evenly arranged on both sides of each fin along the direction of the radiator's oil collection pipe. There are three sets of enhanced heat transfer units. Each set of enhanced heat transfer units includes a fixed frame 3, a finned baffle 8, and baffles 4 arranged on the finned baffle 8. Figure 3As shown, the wind deflector adjustment system includes a wind deflector 5, a connecting rod groove 10, a connecting rod 11, and an automatic rebound structure. The fixed frame 3 is composed of two identical sub-frames spliced ​​together. Each sub-frame has four through holes on its side. It is connected and fixed by top bolts 7 and symmetrically laid on both sides of the upper oil collection pipe 2 of the radiator. The bottom crossbar of the fixed frame is fixed by a connecting sleeve 6.

[0036] When the equipment is under natural cooling, the baffle is arranged perpendicular to the heat sink; when the equipment is under air cooling, the baffle rotates to be parallel to the heat sink. This invention is based on existing plate-type heat sinks, using a fixed frame as the main body. It constructs an enhanced heat transfer unit and a wind regulation system through baffles and baffles; a chimney structure is built using an exhaust box, which strengthens the self-drafting effect of the heat sink, enhances surface convection heat transfer, reduces transformer oil temperature, and extends transformer life.

[0037] The blade stop 8 is connected and fixed through the side through hole of the fixed frame 3. Furthermore, the blade stop is fixed by inserting into the through hole on the fixed frame, and the blade stop can be rotated; the blade stop is provided with aerodynamic blades 4, which can be arranged in a straight line or staggered.

[0038] like Figure 6 As shown, the spoiler 4 is arranged on the winglet baffle 8; the spoiler 4 is made of metal or plastic, and the plastic spoiler 4 is fixed by pins, while the metal spoiler 4 is fixed by welding; the spoiler 4 is a delta wing, a rectangular wing, or other irregular shape; the angle of attack β of the spoiler 4 is controlled by rotating the winglet baffle 8.

[0039] The air intake box 1 has fixed interfaces 9 on both sides for connecting and fixing to the fixed frame 3; the tilt angle α of the air intake box 1 varies between 45° and 90° to adapt to the heat dissipation requirements of different models of finned heat sinks; the height L of the air intake box 1 is 1 / 4 to 1 / 2 of the heat sink height to ensure a certain heat exchange performance while occupying the minimum space.

[0040] Both ends of the connecting rod 11 are provided with bosses. The top is connected to the air box 1 through the connecting rod groove 10, and the bottom is provided with a pair of spring stop rods 14.

[0041] The connecting rod groove 10 is cylindrical, with one end having a diameter equal to the connecting rod diameter and the other end having a diameter the same as the boss diameter of the connecting rod 11. The connecting rod groove 10 and the air box 1 are connected by a thread or a pin.

[0042] like Figure 5 As shown, the baffle plate 5 is fixed to both sides of the heat sink by the connecting rod 11; the length M of the baffle plate 5 is the same as the height of the heat sink, and the width W of the baffle plate 5 is slightly smaller than the spacing between the heat sinks while ensuring its free rotation.

[0043] like Figure 4 As shown, the automatic rebound structure includes a sleeve 12 and a spring 13. The top of the spring 13 is fixed to the sleeve 12 by welding, and the bottom is fixed by a spring stop 14 provided on the connecting rod 11. The bottom of the sleeve is connected to the fixed connecting rod 15 by welding or threaded connection.

[0044] When the transformer radiator is in self-cooling (ON) mode, the heat generated by the internal windings is transferred to the external radiator via transformer oil circulation, then transferred to the radiator wall through convection, and finally dissipated into the air through natural convection. Because the top of the radiator has a higher temperature, cool air is drawn into the gaps between the radiator fins from the bottom. After being disturbed by the turbulence-enhancing vanes, secondary flow is generated, and the boundary layer is disrupted. Finally, the air is heated by the radiator fins and flows out from the top of the radiator. The top air intake box extends each air duct and forms a chimney structure, which better draws in air, accelerates airflow between the radiator fins, and improves heat dissipation performance. In addition, in the self-cooling state, the baffles are arranged perpendicularly to the radiator fins, forming several vertically enclosed channels on the sides. This structure not only extends the length of the "chimney" but also prevents air from entering the gaps between the radiator fins from the sides, thus preventing air from affecting the enhanced heat transfer performance of the turbulence-enhancing vanes.

[0045] As the transformer's heat load increases, the start-up fan puts the transformer radiator into forced air cooling (AF) mode. In this mode, the heat generated by the transformer's internal windings is transferred to the external radiator via transformer oil circulation, then to the radiator wall through convection, and finally dissipated into the air through forced convection. When the fan is arranged in a side-blowing configuration, the baffle plate rotates to a position parallel to the heat sink fins under the fan's action. Since natural convection accounts for a very small proportion at this point, the baffle plate's position parallel to the heat sink fins has only a minor negative impact on the overall heat dissipation performance. When the fan is arranged in a bottom-blowing configuration, the baffle plate remains perpendicular to the heat sink fins. In this case, the airflow created by the baffle adjustment system guides the airflow and also enhances heat exchange.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A detachable finned radiator enhanced heat exchange device, characterized in that, The device includes a top-down air intake box (1), an enhanced heat transfer unit, and a wind deflector system. The air intake box (1) is connected and fixed to the top of the enhanced heat transfer unit. The enhanced heat transfer unit is evenly arranged on both sides of each heat sink along the direction of the oil collection pipe of the radiator. The enhanced heat transfer unit includes a fixed frame (3), a finned baffle (8), and turbulence fins (4) arranged on the finned baffle (8). The wind deflector system includes a wind deflector (5), a connecting rod groove (10), a connecting rod (11), and an automatic rebound structure. The blade baffle (8) is fixed by a side through hole of the fixed frame (3), and the blade baffle (8) is rotatable; the turbulence blades (4) are arranged on the blade baffle (8); both ends of the connecting rod (11) are provided with bosses, the top is connected to the air box (1) through the connecting rod groove (10), and the bottom is provided with a pair of spring baffles (14); the wind baffle (5) is fixed to both sides of the heat sink through the connecting rod (11); the length M of the wind baffle (5) is consistent with the height of the heat sink, and the width W of the wind baffle (5) is slightly smaller than the spacing between the heat sinks while ensuring its free rotation; the automatic rebound structure includes a sleeve (12) and a spring (13), the top of the spring (13) is fixed to the sleeve (12) by welding, and the bottom is fixed by the spring baffles (14) provided on the connecting rod (11).

2. The detachable finned heat sink enhanced heat transfer device of claim 1, wherein, The fixed frame (3) is made up of two identical sub-frames spliced ​​together. It is connected and fixed by top bolts (7) and symmetrically laid on both sides of the upper oil collection pipe (2) of the radiator. The bottom crossbar of the fixed frame is fixed by connecting sleeve (6).

3. A detachable plate-type radiator heat exchange enhancement device according to claim 1 or 2, characterized in that, The fixed frame (3) has through holes on both sides.

4. The detachable plate radiator enhanced heat exchange device according to claim 1, characterized in that, The spoiler wing (4) is made of metal or plastic. Plastic spoiler wing (4) is fixed with pins, while metal spoiler wing (4) is fixed by welding. The spoiler wing (4) is a delta wing, a rectangular wing, or other irregular shape. The angle of attack of the spoiler wing (4) is... β Controlled by rotating the vane stop (8).

5. A detachable plate-type radiator heat exchange enhancement device according to claim 1, characterized in that, The air duct (1) has fixed interfaces (9) on both sides for connecting and fixing to the fixed frame (3); the tilt angle α of the air duct (1) varies between 45 and 90° to adapt to the heat dissipation requirements of different types of plate heat sinks; the height L of the air duct (1) is 1 / 4 to 1 / 2 of the heat sink height, ensuring a certain heat exchange performance while occupying the minimum space.

6. The detachable plate radiator enhanced heat exchange device according to claim 1, characterized in that, The connecting rod groove (10) is cylindrical, with one end having a diameter equal to the diameter of the connecting rod and the other end having a diameter the same as the diameter of the boss of the connecting rod (11). The connecting rod groove (10) and the air box (1) are connected by a thread or a pin.

7. A detachable plate-type radiator heat exchange enhancement device according to claim 1, characterized in that, The bottom of the sleeve is connected to the fixed connecting rod (15) by welding or threaded connection.

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