CN204680519U - For the water-cooling system of oil-filled transformer - Google Patents

Abstract

Water-cooling system for oil-immersed transformers, including water-oil heat exchanger, water inlet pipe, water outlet pipe, and oil inlet pipe and oil outlet pipe respectively connected with the oil tank of the transformer. The water-oil heat exchanger includes a bottom plate, a top plate and multiple heat transfer pipes Plates, top plate, bottom plate and the four corners of the heat transfer plate are all provided with through holes, and each heat transfer plate is provided with V-shaped protrusions, and each heat transfer plate is stacked on top of each other and placed between the bottom plate and the top plate. Gaskets are used to seal between two adjacent heat transfer plates and the through holes to form a flow channel between the plates; the water inlet pipe, water outlet pipe, oil inlet pipe and oil outlet pipe are connected to the four through holes on the top plate respectively. Make water and oil flow in the respective flow channels on both sides of the heat transfer plate, and conduct heat exchange through the heat transfer plate, and a self-operated temperature regulating valve is installed on the water inlet pipe. The transformer of the utility model adopts a water-cooling system for heat dissipation, and controls the flow of water entering the water-oil heat exchanger through a self-operated temperature regulating valve, thereby regulating the oil temperature in the oil tank.

Description

Water Cooling System for Oil-immersed Transformers

technical field

The utility model relates to the technical field of transformers, in particular to a water cooling system for oil-immersed transformers.

Background technique

The cooling of the main transformer in existing substations mostly adopts oil-immersed self-cooling method. In the hot summer, with the advent of high-temperature weather and the increase of load, the temperature of the transformer will rise accordingly. According to DL/T572-2010 "Operation Regulations for Power Transformers" It is recorded in: "The temperature of the top oil of the natural circulation cooling transformer should generally not exceed 85°C", and the temperature of the transformer body has to be reduced by pulling the limit load, and the limit load affects the actual use of the load.

Utility model content

The purpose of the utility model is to provide a water-cooling system for oil-immersed transformers. By controlling the water flow of the water-cooling device, the purpose of adjusting the oil temperature inside the transformer oil tank is achieved.

The technical scheme adopted by the utility model to achieve the above purpose is: a water cooling system for oil-immersed transformers, the water cooling system is located on the low-voltage side of the transformer, including water-oil heat exchangers, water inlet pipes, water outlet pipes and transformers respectively The oil inlet pipe and the oil outlet pipe connected to the oil tank. The water-oil heat exchanger includes a bottom plate, a top plate and a plurality of heat transfer plates. There are through holes in the four corners of the top plate, bottom plate and heat transfer plates. There are V-shaped protrusions, and the heat transfer plates are stacked on each other and placed between the bottom plate and the top plate. The space between the two adjacent heat transfer plates and the through holes are sealed by gaskets to form a flow channel between the plates. , the bottom plate and the top plate are connected by fastening bolts; the water inlet pipe, water outlet pipe, oil inlet pipe and oil outlet pipe are respectively communicated with four through holes set on the top plate, so that water and oil flow on both sides of the heat transfer plate Flow in the respective flow channels, and exchange heat through the heat transfer plates; ball valves are installed on the oil inlet pipe and oil outlet pipe, and an oil pump is installed on the oil inlet pipe, and a self-operated temperature regulating valve is installed on the water inlet pipe.

Among them, two oil pipe adapters and two water pipe adapters are respectively provided at the four through holes on the top plate, and the two oil pipe adapters are respectively connected with the oil inlet pipe and the oil outlet pipe, and the two water pipe adapters are respectively connected with the water inlet pipe and the oil outlet pipe. The outlet pipe is connected.

In the utility model, the bottom of the oil tank is provided with an extension plate, and the water-oil heat exchanger is fixed on the extension plate.

Furthermore, the V-shaped protrusions on two adjacent heat transfer plates in the water-oil heat exchanger are inverted to each other. Due to the mutual inversion of the V-shaped protrusions, the fluid flows in a rotating three-dimensional manner in two adjacent flow channels, resulting in turbulence. Flow, improve the heat transfer effect.

The water-oil heat exchanger of the utility model is formed by sealing and stacking a plurality of plates, and the number of plates can be increased or decreased according to needs, so as to achieve the purpose of increasing or decreasing the heat exchange area.

Beneficial effects: the transformer of the utility model adopts a water-cooling circulation system for heat dissipation, and controls the flow of water entering the water-oil heat exchanger in the water inlet pipe through a self-operated temperature regulating valve, thereby regulating the oil temperature in the oil tank. The sensor in the self-operated temperature regulating valve will sense the oil temperature. When the oil temperature reaches a certain temperature, the valve on the self-operated temperature regulating valve will open, and the cold water will enter the water-oil heat exchanger through the valve; the heated transformer oil will pass through the oil inlet pipe. The ball valve enters the water-oil heat exchanger through the oil pump; the hot oil and cold water exchange heat through the heat transfer plate, so that the oil temperature drops to a certain temperature, and the cooled transformer oil is re-sent into the oil tank through the ball valve on the oil outlet pipe. Water flows out of the water-oil heat exchanger through the outlet pipe. Among them, the V-shaped protrusions on the heat transfer plate used in the water-oil heat exchanger can increase the disturbance of the water and oil medium, so that the fluid medium can reach a turbulent state at a low speed and obtain a higher heat transfer effect.

Description of drawings

Figure 1 is an overall schematic diagram of an oil-immersed transformer;

Fig. 2 is the enlarged schematic view showing A in Fig. 1;

Fig. 3 is the schematic diagram of water-oil heat exchanger;

Figure 4 is an exploded view of the bottom plate, top plate and heat transfer plates in the water-oil heat exchanger;

Figure 5 is a schematic diagram of the water cooling system.

Reference signs: 1, transformer, 2, oil tank, 3, extension plate, 4, water-oil heat exchanger, 40, bottom plate, 41, top plate, 42, heat transfer plate, 43, fastening bolt, 44, V-shaped Protrusion, 5. Water inlet pipe, 6. Water outlet pipe, 7. Oil inlet pipe, 8. Oil outlet pipe, 9. Through hole, 10. Ball valve, 11. Oil pump, 12. Self-operated temperature regulating valve, 13. Oil pipe adapter, 14. Water pipe adapter.

Detailed ways

The water-cooling system used for oil-immersed transformers, the transformer 1 shown in Figure 1 has a high-voltage side and a low-voltage side on both sides, and the water-cooling system is set on the low-voltage side of the transformer 1. The water cooling system shown in Figure 2 includes a water-oil heat exchanger 4, a water inlet pipe 5, a water outlet pipe 6, an oil inlet pipe 7 and an oil outlet pipe 8, and both the oil inlet pipe 7 and the oil outlet pipe 8 are connected with the oil tank 2 of the transformer 1, and the oil tank 2 is provided with an extension plate 3, and the water-oil heat exchanger 4 is fixed on the extension plate 3. In addition, the fuel tank 2 is equipped with an oil level indicator and a thermometer, which is convenient for observing the internal oil level and temperature.

As shown in Figures 3 and 4, the water-oil heat exchanger 4 includes a bottom plate 40, a top plate 41, and a plurality of heat transfer plates 42, and the four corners of the bottom plate 40, the top plate 41, and the heat transfer plates 42 are provided with through holes. Each heat transfer plate 42 is provided with a V-shaped protrusion 44, and each heat transfer plate 42 is placed between the bottom plate 40 and the top plate 41 after being stacked on each other. The V-shaped protrusions are inverted against each other. Gaskets are used to seal between two adjacent heat transfer plates 42 and the through holes to form a flow path between the plates, and the bottom plate 40 and the top plate 41 are connected by fastening bolts 43; the water inlet pipe 5, The water outlet pipe 6, the oil inlet pipe 7 and the oil outlet pipe 8 communicate with the four through holes provided on the top plate 41 respectively, so that water and oil flow in the respective flow channels on both sides of the heat transfer plate 42, and the heat transfer is carried out through the heat transfer plate 42. Exchange; the oil inlet pipe 7 and the oil outlet pipe 8 are provided with ball valves, and the oil inlet pipe 7 is provided with an oil pump 11, and the water inlet pipe 5 is provided with a self-operated temperature regulating valve 12.

As shown in Figures 2 and 4, two oil pipe adapters 13 and two water pipe adapters 14 are respectively provided at the four through holes provided on the top plate 41, and the two oil pipe adapters 13 are connected with the oil inlet pipe 7 and the oil outlet pipe respectively. 8, and two water pipe adapters 14 communicate with the water inlet pipe 5 and the water outlet pipe 6 respectively.

As shown in Figure 5, the working principle of the water cooling system is: external cold water enters the water-oil heat exchanger 4 through the self-operated temperature regulating valve 12, and the sensor in the self-operating temperature regulating valve 12 will sense the oil temperature. When a certain temperature is reached, the valve on the self-operated temperature regulating valve 12 is opened, and the cold water enters the water-oil heat exchanger 4 through the valve, and the hot oil and cold water brought in by the oil pump 11 perform heat exchange through the heat transfer plate 42, so that the oil temperature Dropped to a certain temperature, the transformer oil after cooling is re-sent into the oil tank 2 through the ball valve on the oil outlet pipe 8. Wherein, the V-shaped protrusion 44 on the heat transfer plate 42 forms a certain angle with the flow direction of the liquid medium, and when the liquid passes through, it will cause intense turbulent flow, thereby improving the heat transfer effect.

As shown in Figure 4, the water medium flows into the heat transfer plate from the through hole in the upper right corner of the top plate 41, and flows out from the through hole in the lower right corner of the top plate 41. Similarly, the oil medium flows in from the through hole in the lower left corner of the top plate 41, and Flow out from the through hole in the upper left corner of the top plate 41. The four through holes are sealed by gaskets to avoid mutual leakage of water medium and oil medium. The two sides of the sheet flow alternately for heat exchange. As the fluid medium passes through the gaps between the heat transfer plates, the V-shaped protrusions 44 provided on the heat transfer plates 42 make the fluid medium continuously change the flow direction, generate rotation and twist, and form many fine eddies, so that the fluid The particles in each part of the medium are continuously and rapidly transferred, so that the heat exchange is carried out rapidly. The utility model can change the arrangement of the heat transfer plates 42 or replace several heat transfer plates 42 as required, so as to achieve the required process combination and adapt to new heat exchange conditions.

Claims (4)

1. for the water-cooling system of oil-filled transformer, it is characterized in that: this water-cooling system is located at the low-pressure side of transformer (1), comprise water oil heat exchanger (4), water inlet pipe (5), outlet pipe (6) and the oil inlet pipe (7) be communicated with the fuel tank (2) of transformer (1) respectively and flowline (8), water oil heat exchanger (4) comprises base plate (40), top board (41) and multiple heat transferring plate (42), base plate (40), the four corners position of top board (41) and heat transferring plate (42) all offers through hole, each heat transferring plate (42) is equipped with V-type projection (44), each heat transferring plate (42) is mutually stacked to be placed between base plate (40) and top board (41), between adjacent two heat transferring plates (42) and through hole all by washer sealing to form the runner between plate, connected by fastening bolt (43) between described base plate (40) and top board (41), described water inlet pipe (5), outlet pipe (6), oil inlet pipe (7) and flowline (8) respectively four through holes arranging upper with top board (41) are communicated with, water and oil are flowed in the runner separately of heat transferring plate (42) both sides, carries out heat exchange by heat transferring plate (42), oil inlet pipe (7) and flowline (8) are equipped with ball valve, and oil inlet pipe (7) is provided with oil pump (11), water inlet pipe (5) is provided with self force type temperature regulating valve (12).

2. the water-cooling system for oil-filled transformer according to claim 1, it is characterized in that: upper four through holes arranged of top board (41) are respectively equipped with two oil pipe adapters (13) and two water pipe adapters (14), two oil pipe adapters (13) are communicated with flowline (8) with oil inlet pipe (7) respectively, and two water pipe adapters (14) are communicated with outlet pipe (6) with water inlet pipe (5) respectively.

3. the water-cooling system for oil-filled transformer according to claim 1, is characterized in that: the bottom of fuel tank (2) is provided with extension board (3), and described water oil heat exchanger (4) is fixed on this extension board (3).

4. the water-cooling system for oil-filled transformer according to claim 1, is characterized in that: the V-type on heat transferring plate (42) adjacent between two in water oil heat exchanger (4) is protruding is inverted mutually.