KR20000031082A - Variable capacity radiator - Google Patents

Abstract

PURPOSE: A variable capacity radiator is provided to protect an engine from being overheated by adjusting a radiating surface of core according to a temperature of the cooling water. CONSTITUTION: A variable capacity radiator comprises a first tank(5) and a second tank(6) which are arranged to face each other with a spacing therebetween, both tanks(5,6) having inlet/outlet pipes, respectively, for engine cooling water, a plurality of tubes(2) arranged between the first and second tanks and which have both ends thereof communicated to the tanks for flowing of cooling water, a cooling fin(3) alternately disposed between the tubes(2), and a closing/opening unit(11) disposed in a predetermined position of the interior of the first tank(5) so as to compartmentalize the interior of the tank(5), the closing/opening unit(11) adjusting the radiation surface of core by changing the volume of the first tank(5) in response to the temperature of the cooling water flowing into the interior of the first tank(5).

Description

Variable capacity radiator

The present invention relates to a heat exchanger used in the engine cooling apparatus of a vehicle, and more particularly to a variable capacity radiator capable of adjusting the heat dissipation area of the core according to the pressure of the heat medium flowing into the heat exchanger.

Gasoline engines are internal combustion engines that convert thermal energy into mechanical energy. However, internal combustion engines cannot convert all of the heat energy of combustion into mechanical energy, and the conversion efficiency is only about 30%. About 30% of the burned thermal energy is dissipated, about 30% is exhausted, and about 10% is mechanical losses. Most gasoline engines are made of metal. For this reason, the engine melts by heat unless the heat energy of combustion is exhausted to some extent.

Less heat radiation can make an engine more efficient, but to do so it is necessary to cool the engine so that it does not exceed a certain temperature.

There are two types of engine cooling: water cooling and air cooling. In water-cooling, a coolant passage is formed in a cylinder block and a cylinder head, and water is passed therethrough to cool engine parts. The coolant that cools the cylinder block is forcibly sent from the radiator hose to the radiator by a water pump driven by a crankshaft pulley, and the coolant is radiated from the radiator and returned to the engine to cool the engine.

The radiator consists of a tube through which the coolant passes and a cooling fin interposed between the tubes.The high temperature coolant sent from the engine enters the outlet tank of the radiator from the radiator hose, radiates from the tube, flows to the inlet tank, and is cooled to the engine. It has a cross flow type cooling water flow path.

The radiator having the coolant flow path cools the engine while the coolant flows through the entire tube formed in the core at the same time as the engine is initially started or when the engine is overheated.

Normally, the engine can start normal combustion after reaching the proper temperature after the initial start-up, which can increase fuel economy and reduce the emission of exhaust gas.However, when the coolant flows through the whole tube at the same time as the engine starts, heat dissipation of the core Because of the larger area, the warm-up time is extended until the engine reaches the appropriate temperature, which is disadvantageous in terms of fuel consumption and exhaust gas emission.

In particular, there is a problem in that the warm up time of the engine is increased due to the low atmospheric temperature, so that the heating time must be delayed until the coolant reaches an appropriate temperature.

The present invention has been made in view of this point, and an object of the present invention is to provide a variable capacity radiator capable of adjusting the heat dissipation amount of the core according to the degree of overheating of the engine.

This object can be achieved by allowing the heat dissipation area of the core of the radiator to be synchronized with the temperature of the engine. Embodiments according to the present invention are spaced apart from each other and provided with inlet and outlet pipes for inflow and outflow of engine coolant, respectively. First and second tank portions; A plurality of tubes coupled to both ends between the first and second tanks to flow cooling water; Cooling fins alternately interposed between the plurality of tubes; And shielding means installed at a predetermined position inside the first tank part into which coolant is introduced to partition the inside and adjust a heat dissipation area of the core by varying a volume of the first tank part in response to a temperature of the coolant.

According to this configuration, when the temperature of the coolant flowing into the first tank is low, the conduit is closed by the shielding means to block the flow of the coolant, thereby reducing the heat dissipation area of the core, and conversely, when the temperature of the coolant is high, By opening the cooling water, the heat dissipation area of the core is increased.

1 is a front view of a radiator according to an embodiment of the present invention,

Figure 2 is a cross-sectional view seen from the line A-A of Figure 1 for showing the main part of the present invention,

3 is a cross-sectional view showing a state in which the baffle is closed to show the main portion of the present invention;

4 is a cross-sectional view showing a state where the baffles are opened;

5 is an enlarged cross-sectional view showing a baffle according to the present invention;

Figure 6 is a sectional view of the main part showing another embodiment of the present invention,

7 is a schematic view showing another embodiment of the present invention;

8 is a cross-sectional view taken from the line A-A of FIG. 5,

9 is a schematic cross-sectional view of an open state of a tank according to another embodiment;

10 is a schematic cross-sectional view of a state in which a tank is closed.

* Description of the symbols for the main parts of the drawings *

1; radiator 2; tube

4 core 5 first tank part

10,20; baffle 11; shielding hole

23; Thermostat 30; Fixed Pack

31; rotating baffle 30a, 31a; through

32; stepping motor 33; microcomputer

34; Thermistor

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 shows a front view of the radiator according to the present invention, the radiator denoted by the entire reference numeral 1 is composed of a corrugated fin (3) interposed between the tube 2 and the tube 2 disposed in the horizontal direction And a first tank portion 5 and a second tank portion 6 which are connected to both ends of the tube 4 and heat dissipate the cooling water, and are spaced apart from each other left and right. The refrigerant introduced into the first tank part 5 flows to the engine side not shown through the second tank part 6 after the heat exchange while the coolant flows in the horizontal direction according to the arrangement of the cores.

The first tank portion 5 (or the second tank portion) has a header 7 communicating with the plurality of tubes 2, a tank 8 coupled to the outside of the header 7 and having an inlet hole 5a of cooling water formed therein. Combination of these forms a flow path for cooling water having a half arc shape in cross section. In addition, an outlet hole 6a is formed in the second tank part 6 corresponding to the first tank part 5 to allow the cooled cooling water to flow to the engine side (not shown).

The header 7 has a plurality of insertion grooves 7a formed in the longitudinal direction at the bottom thereof, and end portions of the tube 2 are coupled to each other, and both ends thereof have a U-shaped accommodating portion in which the insertion portion 8b of the tank 8 is accommodated. By forming the 7b and bending the end of the receiving portion 7b by a press, the header and the tank are joined.

The tank 8 is formed with a curved portion 8a having a cross-sectional tunnel shape, and an insertion portion 8b bent in the outer horizontal direction is formed at an end of the curved portion 8a to accommodate the header 7. The water leakage of the cooling water is prevented by engaging with the portion 7b but interposing the gasket 9 therebetween.

Furthermore, the present invention is provided with shielding means for partitioning the inside of the first tank portion 5 in the horizontal direction and for communicating adjacent chambers in accordance with the temperature of the cooling water. The shielding means is provided with a baffle 10 on the upper portion of the first tank portion 5 to open and close the conduit in response to the temperature of the cooling water.

The baffle 10 has a fine shielding hole 11 is formed in the center in the thickness direction, the cross-sectional area of the shielding hole 11 is contracted and expanded in accordance with the temperature of the cooling water to determine the flow rate of the cooling water per hour.

In addition, as shown in FIG. 5, the periphery of the shielding hole 11 is tapered at both sides of the baffle 10 around the shielding hole 11. At this time, the length of the shielding hole 11 is preferably to have a length of 1/2 with respect to the thickness of the baffle 10, so that the shielding hole 11 is a response speed such as shrinkage and expansion with respect to the temperature of the cooling water It is possible to increase the flow rate of the cooling water to the adjacent chambers.

The baffle 10 is a temperature sensitive elastic material, and expands when the temperature of the cooling water is high, and conversely, when the temperature of the cooling water is low.

Therefore, when the initial temperature of the engine or in the winter when the temperature of the coolant is low due to the low external temperature, the shielding hole 11 formed in the baffle 10 is contracted as shown in FIG. 3 to block the flow of the coolant to the adjacent chamber. Since the coolant flows through a portion of the entire core while exchanging heat, the temperature of the coolant can be raised to an appropriate temperature band in a short time, thereby reducing fuel consumption and exhaust gas emissions. Furthermore, in winter, it is possible to supply warmth from a heater in a short time. .

On the contrary, when the load of the engine is increased in summer or the temperature of the coolant is increased, the shielding hole 11 formed in the baffle 10 expands and flows the coolant to an adjacent chamber as shown in FIG. 4. Therefore, since the high temperature cooling water flows through the entire core while exchanging heat, the heat dissipation area of the core is increased, thereby preventing overheating of the engine.

Figure 6 shows another embodiment of the shielding means according to the present invention, the through-hole 21 is formed in the thickness direction of the baffle 20 and the mounting groove 22 is formed around the through-hole 21.

And the said through-hole 21 is provided with the thermostat 23 responding according to the temperature of a cooling water.

According to this configuration, when the temperature of the coolant is low, the thermostat 23 is in close contact with the seating grooves 22 of the baffle 20 to close the through hole 21. On the contrary, when the temperature of the coolant is high, the thermostat 23 is spaced apart from the seating groove 22 of the baffle 20 to open the through hole 21 to widen the heat dissipation area of the core to prevent overheating of the coolant.

Figure 7 shows another embodiment of the shielding means according to the present invention. As shown, a pair of baffles for partitioning the first tank part 5 up and down are rotatably faced.

The pair of baffles is divided into a fixed baffle 30 made of the same shape as the cross-sectional area of the first tank part 5 and a rotating baffle 31 formed in a disc shape, wherein the fixed baffle 30 has a first tank part. While partitioning (5) up and down, a plurality of through-holes (30a) are formed at regular intervals from the center to the circumferential direction through which the cooling water flows.

The rotating baffle 31 faces the upper surface of the fixed baffle 30 but is rotated by an external control means, and the plurality of through holes 31a corresponding to the plurality of through holes 30a formed in the fixed baffle 30. Is formed.

At this time, the area formed in the through hole and the through hole is better to be able to completely block the cooling water by larger than the area of the through hole.

In addition, the rotating baffle 31 is built in the stepping motor 32 provided on the outer upper surface of the first tank portion 5 so as to open and close the through hole 30a formed in the fixed baffle 30 while rotating according to its energization. do.

The stepping motor 32 is controlled by the microcomputer 33 that outputs the corresponding signal in comparison with the reference data set according to the output signal of the thermistor 34 for detecting the temperature of the cooling water.

That is, when the temperature of the coolant sensed by the thermistor 34 is low, the microcomputer 33 outputs a low level signal to cut off the power applied to the stepping motor 32 so that the through hole 30a of the fixed baffle 30 is provided. It is sealed by the periphery of the through hole 31a of the rotating baffle 31. On the contrary, when the temperature of the cooling water is high, the stepping motor 32 is energized to rotate the rotating baffle 31, but the through hole 31a and the fixed baffle thereof. By making the through holes 30a of the 30 coincide with each other, the flow of the cooling water is made to the entirety of the first tank part 5, and thus the cooling water flows through the entire core to increase the amount of heat dissipation.

Although the present invention has been described with respect to various embodiments, in addition to the shape memory alloy or orifice in response to the temperature of the cooling water can be implemented by a variety of methods, such as the heat dissipation area control means of the core described in the claims Note that it can be implemented through.

As described above, the present invention is to install a baffle at a predetermined position of the first tank portion to adjust the heat dissipation area of the core in accordance with the temperature of the coolant, it is possible to maintain a constant pressure of the coolant passing therethrough, thus the initial engine When the start-up or winter coolant reaches the proper temperature, and when the coolant temperature is overheated, the heat dissipation area of the core can be increased to prevent the engine from overheating.

Claims (4)

First and second tank parts spaced apart from each other and provided with inlet and outlet pipes for inflow and outflow of engine coolant, respectively; A plurality of tubes coupled to both ends between the first and second tanks to flow cooling water; Cooling fins alternately interposed between the plurality of tubes; And shielding means installed at a predetermined position inside the first tank portion into which coolant is introduced to partition the inside and adjust a heat dissipation area of the core by varying a volume of the first tank portion in response to a temperature of the coolant. Radiator with variable capacity. 2. The variable capacitance radiator of claim 1, wherein the shielding means is an elastic member having a shielding hole formed at a center thereof in response to a temperature of the cooling water, and an annular taper formed on both sides of the shielding hole. The variable capacity radiator of claim 1, wherein the shielding means is a thermostat sensitive to the temperature of the cooling water. The method of claim 1, wherein the shielding means is formed with a plurality of apertures formed in the circumferential direction, and a plurality of through holes corresponding to the through-holes formed in the fixed body rotatably arranged in a horizontal direction facing the fixture; And a cooling means for supporting the rotating body rotatably and controlling the amount of rotation of the rotating body according to the temperature of the cooling water and a cooling water temperature sensor for detecting the temperature of the cooling water. radiator.