KR100821588B1 - Fuel cooling system vehicles - Google Patents

Abstract

A fuel cooling system of vehicles is provided to lower the temperature of fuel suitably when fuel in a fuel tank is supplied to an engine through a fuel line so that the temperature of the fuel is raised to a limit temperature or more. A fuel cooling system of vehicles includes a micro-channel(30). The micro-channel comprises an inlet and an outlet. Supplied fuel is stored at the side of the inlet. A plurality of fuel injection pins are provided at the side of the inlet of the micro-channel such that fuel is distributed with wide area while the pressure of the fuel is being lowered. The fuel passes through a plurality of passages and then is mixed at the side of the outlet. A thermo-electric unit(40) is provided at two opposite sides of the micro-channel. A heat discharging unit(50) cools fuel delivered to two opposite sides of the thermo-electric unit. A power supplying part supplies power to the thermo-electric unit. A controller(10) is connected to the power supplying part to adjust the supply of power. A thermal sensor(60) detects the temperature of the inlet and the outlet of the micro-channel.

Description

Fuel cooling system vehicles

1 is an exemplary view showing a structure of a fuel cooling device of a conventional vehicle.

Figure 2 is an installation state showing the installation state of the present invention.

3 is a plan view showing the structure of a microchannel, which is a main part of the present invention;

Figure 4 is an exemplary view showing the structure of the thermoelectric means that is the main part of the present invention.

Figure 5a is a photograph showing the velocity field inside the conventional channel without the channel portion

Figure 5b is a photograph showing the velocity field inside the channel with only the channel portion.

Figure 5c is a photograph showing the velocity field inside the channel with fuel distribution pin only.

Figure 5d is a photograph showing the velocity field of the microchannel to which the technique of the present invention is applied.

Figure 6 is an enlarged photograph of Figure 5d.

Figure 7a is a photograph showing the temperature distribution in each section of the microchannel, the main part of the present invention.

Figure 7b is a photograph showing the temperature distribution for the upper, middle and lower parts when viewed from the side of the microchannel, the main part of the present invention.

8a to 8j are graphs showing the temperature distribution for each part of the microchannel at different speeds and flow rates.

Figure 9 is an exemplary view showing an embodiment of the structure in which the cooling means is installed in the fuel cooling system of the present invention vehicle.

※ Explanation of code for main part of drawing ※

10: control unit 20: power supply unit

30: micro channel 31: inlet side storage unit

33: channel portion 33a: distributed through

35: fuel distribution pin 40: thermoelectric means

41 P-type semiconductor metal 42 N-type semiconductor metal

43 electrode 45 conductor

50: heat dissipation means 60: temperature sensor

70: insulator 90: cooling means

The present invention relates to a fuel cooling system of a vehicle for appropriately lowering the temperature of a fuel whose temperature has risen when the fuel in the fuel tank is supplied to the engine through a fuel line.

In the fuel tank mounted on the lower side or the side of the vehicle, a metal plate is formed into a cylindrical shape so that fuel required for driving the engine can be stored. The tank is provided with a fuel pump for pumping fuel and a fuel sender device for measuring the amount of stored fuel.

The fuel stored in the fuel tank is pumped by the driving of the fuel pump with the start of the engine, and then an appropriate amount is injected into the combustion chamber through the injector, and the surplus fuel is returned to the fuel tank. The fuel returned to the fuel tank is heated up or passed around the engine during the pumping of the fuel, and thus rises above the temperature stored in the fuel tank.

The cause of the increase in fuel temperature in the fuel tank is not only due to the internal fuel tank caused by the return fuel, but also the increase in the ambient temperature due to the rise of the atmosphere and the temperature, such as the hot summer, and the radiation of the exhaust system due to the formation of the tank itself adjacent to the vehicle exhaust system. There are also external causes for the fuel tank.

When the temperature of the fuel stored in the fuel tank is increased, the fuel supply amount from the fuel pump to the combustion chamber cannot be made in an optimal state, and thus may adversely affect the output of the engine.

In particular, when the temperature of the fuel rises above an appropriate level, a change in the viscosity of the fuel and a change in the density of the fuel occur, and the change in the viscosity of the fuel precedes the leakage of the fuel in the fuel pump.

As the temperature of the supplied fuel rises, the viscosity of the fuel decreases gradually. The result is a thinner fuel that is increasingly leaked from pump and injector components. This results in a problem that less fuel is injected into the cylinder as a whole and the output of the engine is lowered.

In addition, the density change of the fuel causes a difference in the amount of fuel injected into the cylinder. When the temperature of the fuel rises and the density decreases, even if the same volume of fuel is injected, the mass of the injected fuel decreases, and the energy converted during the combustion process also decreases, resulting in a problem that the output falls.

Therefore, in the related art, a fuel temperature cooling apparatus for lowering a high temperature fuel temperature to an appropriate level in the middle of a fuel line including a fuel tank has been applied in various forms.

For example, an apparatus for allowing the cooling water used in the cooling system of the engine to pass through the middle of the fuel line, and when the fuel heated along the line is supplied from the fuel tank 100 as shown in FIG. And a device having a structure for supplying the cooled fuel to the injector 400 by passing through the fuel cooling device 300 through which the refrigerant used in the gas flows.

However, in order to operate the air conditioner by operating the air conditioner using the refrigerant of the air conditioner system and cooling the fuel before the final injection, there is another problem such as taking the power of the engine and the performance degradation of the vehicle. .

Such a device is not only difficult to apply to domestic small and medium-sized vehicles with low power, but also has a large impact on fuel consumption since air conditioners must be operated at all times.

In view of the conventional problems as described above, Japanese Utility Model Publication No. Hei 5-52253 and Japanese Patent Publication No. Hei 8-100717 have been proposed to solve this problem. The above-mentioned Japanese Utility Model Publication No. Hei 5-52253 is a cooler interposed in a fuel pipe for connection between a fuel tank and an engine, in which a main body for distributing fuel therein and an endothermic portion are provided on the surface of the main body. The radiator provided with the cooler and the heat radiating part of the electronic cooler is provided.

The electronic cooler relates to a fuel cooler of an internal combustion engine, characterized in that the Peltier effect of the thermoelectric element is used, and an effect thereof is that an endothermic portion of the electronic cooler is installed on the surface of the main body through which the fuel flows. Because it is installed, the structure is simple and compact, and it can be arranged without taking place in a narrow engine room.

In particular, it is possible to reliably prevent the disturbance of fuel flow, ie, VAPOR LOCK, caused by the fuel heating and boiling in summer.

On the other hand, Japanese Patent Application Laid-Open No. Hei 8-100717 is composed of a plurality of parallel tubules in the middle of the pipe for conveying fluid, surrounds the tubules (branched pipes), and provides a cooling vessel in which a refrigerant is enclosed, thereby cooling Peltier on the outer wall of the cooling vessel. It relates to a fluid conveying pipe cooling device installed by contacting the endothermic surface of the device, its effect is to cool the pipe to the customs (branch pipe) in order to cool the fluid in the pipe with the Peltier cooling element, the cooling tube containing the refrigerant is introduced Therefore, a large number of Peltier cooling elements are installed to increase the cooling effect and facilitate the attachment of the Peltier cooling elements.

However, Japanese Utility Model Publication No. Hei 5-52253 described above is to bend the fuel line so as to make the fuel line passing through the main body be an "S" type in order to lengthen the time that fuel passes through the main body, which decreases cooling efficiency. there is a problem.

Japanese Patent Application Laid-open No. Hei 8-100717 discloses that customs can pass a fluid (fuel), but for cooling the fluid, a coolant is used around the customs and there is a barrel surrounding the coolant. After the heat is transferred from the fluid using the conduction of the tubules, the heat is transferred to the cylinder surrounding the refrigerant using the convection and heat conduction of the refrigerant and then moved to the heat absorbing surface of the Peltier cooling element using the thermal conductivity of the cylinder. The furnace is large in size and complicated in structure, which also has a problem of low cooling efficiency.

The present invention devised in view of the above-described conventional problems by cooling the temperature of the heated fuel to maintain a constant temperature to solve the problems of the conventional fuel cooling device at a glance, as well as reducing exhaust gas, improving engine durability, fuel consumption rate It is to provide a vehicle fuel cooling device which minimizes the engine power and the performance degradation of the vehicle by improving the reduction, improving the ignition of the engine, maintaining the viscosity of the fuel, and maintaining the density of the fuel.

The object of the present invention is a fuel cooling device of a vehicle installed in a fuel supply line supplied from a fuel tank to an engine to cool the fuel supplied by using a Peltier effect, the fuel supply device being supplied from the inlet side for temporarily storing the supplied fuel Fuel is mixed at the outlet side through a channel section having a dispersion passage formed with a plurality of fuels passing through the inlet side having a plurality of fuel dispersing pins so as to diffuse the large area while reducing the pressure of the fuel. A micro channel for discharging; Thermoelectric means provided on both sides of the micro channel; A power supply unit for supplying power to the thermoelectric means; It is achieved by a fuel cooling system of a vehicle, characterized in that it comprises a control unit connected to the power supply to adjust the supply of power and a temperature sensor for detecting the inlet and outlet temperature of the micro-channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an installation state diagram showing an installation state of the present invention, according to the present invention, which is installed on a fuel supply line supplied to an injector from a fuel tank, and distributes and passes the supplied fuel to cool the supplied fuel. The thermoelectric means 40 is installed at the side of the side, and the heat dissipation means 50 is installed toward the outer side of the thermoelectric means 40.

Meanwhile, the temperature sensor 60 is installed at the inlet side and the outlet side of the micro channel 30 installed as described above, and the temperature sensor 60 and the thermoelectric means 40 are configured to be connected to the control unit 10. .

At this time, the structure of the micro-channel 30 is as shown in Figure 3 so that it can be spread in a large area while reducing the pressure of the fuel supplied from the inlet side storage portion 31 for temporarily storing the fuel supplied as Fuel is mixed in the outlet side storage portion 32 by passing through the channel portion 33 having the dispersion passage formed with a plurality of fuels having passed through the inlet side storage portion 31 having the plurality of fuel distribution pins 35. In this way, the fuel can be discharged.

Meanwhile, in the structure of the thermoelectric means 40, as shown in FIG. 4, an electrode 43 is disposed between the insulator 44 and the insulator to face each other, and the electrodes 43 are spaced apart from the upper and lower parts. ) And the electrode 43 are installed in a zigzag form and connected by a conductor 45.

The conductor 45 has a structure in which the first conductor connecting the electrode 43 and the electrode 43 is a P-type semiconductor metal 41 and the second conductor is connected by an N-type semiconductor metal 42. The odd-numbered seats are P-type semiconductor metals 41 and the even-numbered connecting seats are N-type semiconductor metals 42.

On the other hand, the P-type semiconductor metal 41 and the N-type semiconductor metal 42 is preferably made of any one selected from Bi-Te series, Ge-Si series, Mn series, the insulator 70 under the electrode in the downward direction Is installed to prevent leakage of power when the power is applied.

9 is an embodiment of the present invention can be used to further install a cooling means 90 for cooling the heat dissipation means 50 at a distance away from the heat dissipation means 50 and the cooling means 90 is Ordinary water-cooled structure and air-cooled structure may be taken, or may be used by changing to the structure using the gas injected into the air conditioner.

The reason for further installing the cooling means 90 as shown in Figure 9 is to increase the cooling efficiency.

Referring to the operation and effect of the present invention having the structure as described above in the inlet side storage unit 31 for temporarily storing the fuel supplied from the micro-channel 30 by a line connected to the line transported to the injector in the fuel tank The fuel is temporarily stored.

At this time, the fuel supplied to the front end of the inlet-side storage part 31 has a much higher cooling effect because the fuel is evenly distributed to the channel part 33 by the fuel dispersing pin 35 as shown in FIG. As shown in FIG. 5D, an effect of lowering the vortex of the fuel may also be obtained.

More specifically, as shown in FIG. 5A, as shown in the photograph showing the velocity field inside the conventional channel without the channel part, the internal flow cannot be dispersed in the microchannel 30 due to the flow rate of the supplied fuel. It can be seen that this is very unstable, as shown in the photo showing the velocity field inside the channel with only the channel portion as shown in Figure 5b is smooth flow but improper flow rate distribution as shown in Figure 5c As can be seen from the photo showing the velocity field inside the channel with only the fuel distribution pin, the flow distribution effect is unstable.

As a result of experiments by changing the shape of the inside of the channel, when looking at the velocity field of the internal flow of the channel, it can be seen that the conventional microchannel without the channel part is very unstable in the internal flow as shown in FIG. As shown in FIG. 5C, when only the channel is present, the flow is smooth, but the flow distribution is not appropriate. As shown in FIG. 5C, the flow distribution effect is provided when only the fuel distribution pin 35 is installed to distribute the flow. Although unstable, as shown in FIG. 5D, the flow rate is primarily dispersed in the fuel dispersing pin 35 when the channel part 33 and the fuel dispersing pin 35 are installed in the microchannel 30. In the next channel section 33, each channel is distributed at a similar flow rate and passes through the flow path, so that the effective cooling area is properly distributed when cooling on the surface of the flow path. The result is a temperature distribution that is differentially cooled evenly.

The reason why the fuel is temporarily stored in the inlet side storage unit 31 is because the cross-sectional area of the inlet side storage unit 31 is larger than the cross-sectional area of the line, and also the fuel supplied to the dispersion through hole 33a is dispersed to make the volume larger. The purpose is to form.

The supplied fuel passes through the channel part 33 provided with the dispersion through hole 33a. At this time, the thermoelectric means 40 is installed at both sides of the channel part 33 so as to form a large area for heat exchange. The efficiency is high.

On the other hand, when looking at the temperature distribution in each section of the micro-channel 30 it can be seen that the temperature distribution of the channel portion 33 is even and stable as shown in the accompanying drawings, the cooling means 90 is Looking at the flow rate and flow rate for each section of the installed micro-channel 30, it can be seen that the same as the following table.

v = 0.05 m / s, q = 10000 W / m2 Top Mid Bot One 329 340 329 2 296 330 296 3 251 273 251 4 228 251 228 5 203 217 203 6 150 161 150 7 117 128 117 8 117 128 117

v = 0.1 m / s, q = 5000w / m2 Top Mid Bot One 335 340 335 2 328 338 328 3 318 328 318 4 311 321 311 5 304 313 304 6 292 300 292 7 280 290 280 8 285 287 285

v = 0.1 m / s, q = 10000w / m2 Top Mid Bot One 330 340 330 2 316 335 316 3 298 315 298 4 283 300 283 5 268 287 268 6 240 258 240 7 220 239 220 8 230 234 230

v = 0.1 m / s, q = 15000w / m2 Top Mid Bot One 326 340 326 2 304 333 304 3 275 304 275 4 254 282 254 5 232 261 232 6 196 203 196 7 160 189 160 8 174 182 174

v = 0.5 m / s, q = 10000 W / m2 Top Mid Bot One 335 340 335 2 324 340 324 3 319 336 319 4 317 333 317 5 314 330 314 6 307 325 307 7 306 320 306 8 313 319 313

v = 0.5 m / s, q = 15000w / m2 Top Mid Bot One 331 340 331 2 316 340 316 3 308 334 308 4 306 331 306 5 301 325 301 6 291 316 291 7 289 310 289 8 299 308 299

v = 0.5 m / s, q = 20000 W / m2 Top Mid Bot One 328 340 328 2 310 340 310 3 297 333 297 4 295 327 295 5 287 320 287 6 275 310 275 7 271 300 271 8 286 297 286

v = 1 m / s, q = 10000 W / m2 Top Mid Bot One 336 340 336 2 329 340 329 3 322 338 322 4 321 336 321 5 319 335 319 6 316 333 316 7 321 330 321 8 325 329 325

v = 1 m / s, q = 20000 W / m2 Top Mid Bot One 333 340 333 2 318 340 318 3 286 335 286 4 285 333 285 5 278 330 278 6 267 325 267 7 282 320 282 8 296 320 296

v = 1 m / s, q = 30000 w / m2 Top Mid Bot One 329 340 329 2 307 340 307 3 286 334 286 4 285 330 285 5 278 325 278 6 267 318 267 7 279 310 279 8 282 308 282

On the other hand, it can be seen that as shown in the accompanying drawings, each table as a graph shown in FIG.

The fuel cooling system of the present invention, which operates in such a structure, cools the temperature of the heated fuel and maintains it at a constant temperature, thereby eliminating the problems of the conventional fuel cooling system at once, as well as reducing exhaust gas, improving engine durability, and fuel. By reducing the consumption rate, improving the ignition of the engine, maintaining the viscosity of the fuel, maintaining the density of the fuel, there is an effect to minimize the power degradation of the engine and the performance of the vehicle.

Claims (2)

In a fuel cooling device of a vehicle installed in the fuel supply line supplied from the fuel tank to the engine to cool the fuel supplied by using the Peltier effect, A channel having a distribution passage formed of a plurality of fuels passing through the inlet side having a plurality of fuel dispersing pins so as to diffuse into a large area while reducing the pressure of the supplied fuel at the inlet side for temporarily storing the supplied fuel. A micro channel through which the fuel is discharged by mixing the fuel at the outlet side; Thermoelectric means provided on both sides of the micro channel; Heat dissipation means for cooling the transferred temperature to both sides of the thermoelectric means; A power supply unit for supplying power to the thermoelectric means; A control unit connected to the power supply unit to regulate supply of power; And a temperature sensor for detecting the inlet and outlet temperatures of the microchannels. 2. The fuel cooling system of claim 1, wherein cooling means for cooling the heat radiating means is further provided at a distance from the heat radiating means.

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