KR101543609B1 - A Integrated-type Heat Exchanger - Google Patents

Abstract

The present invention relates to an integrated heat exchanger in which an oil cooler and a condenser are integrally formed and minimizes a pressure drop generated in an oil cooler. In order to achieve this, an inlet and an outlet are provided in a header tank on one side, and are divided into baffles, thereby forming a U-turn type of oil cooler, in which holes are formed in the baffle. The holes can improve the durability of the transmission by allowing the introduced oil to be bypassed, thereby improving the pressure drop amount.

Header tank, inlet, outlet, baffle, hole

Description

[0001] The present invention relates to an integrated type heat exchanger,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated heat exchanger, and more particularly, to an integrated heat exchanger in which a condenser and an oil cooler are integrally formed to improve the structure of a baffle for partitioning an inlet and an outlet of an oil cooler will be.

The automotive cooling module consists of a radiator, condenser, fan shroud and oil cooler. The radiator is a device that cools the engine through heat exchange between the cooling water and the atmosphere. The condenser is positioned at the front of the automobile engine room and serves to cool the high-temperature and high-pressure gas refrigerant transferred from the compressor through heat exchange with the air to convert it into a liquid-state refrigerant. The heat exchange of the condenser causes the heat obtained by the evaporator inside the vehicle to be discharged to the outside of the vehicle on the air conditioning system. The fan shroud functions to maintain the cooling performance of the radiator and the condenser by forcing the fan to operate by being positioned behind the radiator and the condenser and forcing the fan to pass the wind. It consists of a vane shaped fan, a motor that turns it, and a shroud that serves as a motor support and air guide. It operates according to the temperature of the cooling water, the operating condition of the air conditioner, and the pressure of the refrigerant. Transmission oil cooler (Transmission oil cooler) is a cooling device that keeps the temperature of auto transmission properly. It is divided into a built-in water-cooled oil cooler installed in the radiator tank and an external air-cooled oil cooler installed in a carrier or a cooling module. The built-in oil cooler and the external oil cooler lower the temperature of the transmission oil by exchanging heat with the atmosphere.

In such a cooling module of an automobile, a condenser and an oil cooler, which are capable of simultaneously performing a liquefaction operation of a refrigerant gas and an oil cooling operation by integrating a condenser and an oil cooler into a single heat exchanger, No. 6,394,176.

1 and 2, an oil cooler in which oil flows and a refrigerant flows in the lower portion of the integrated heat exchanger 10 are disclosed. In the case of the oil cooler, the oil flows in the inlet 51a and is discharged through the tube 20 and the outlet 51b provided at the other side. The refrigerant flows into the inlet 52a of the condenser and the refrigerant flowing through the tube 60 is changed due to the baffles 54 and 55 provided in the tanks 40 and 50 and the refrigerant flows through the outlet 52b do. Such an integrated heat exchanger is provided so that the oil and the refrigerant can flow independently due to the baffles 53a and 53b. 2, the tube 20 on the oil cooler side is formed with two channels 22 through one partition 21. In the case of the tube 60 on the condenser side, four channels 62 are formed through three partition walls 61. The pin 30 interposed between the tube and the tube is the same as a general heat exchanger.

In this type of integrated heat exchanger, the above-mentioned U.S. patent discloses that when the oil and the refrigerant pass through the tube of the same size and shape, the oil is much viscous as compared with the refrigerant, so that the pressure drop on the oil side occurs much more quickly. We attempted to solve this problem by limiting the relationship between hydraulic diameters of each tube to the following inequality.

[expression]

0.8 mm < 2 > DHa x DHb < 3.00 mm &

Where DH is the hydraulic diameter (DH) of the tube defined by DH = 4S / P, S is the cross-sectional area of the tube (unit mm 2), and P is the perimeter of the tube (wet perimeter, unit mm).

U.S. Patent Publication No. 2005/0061489 discloses another integrated heat exchanger. As shown in FIG. 3, the oil cooler adopts a structure in which a condenser is mounted on an upper portion of the oil cooler. Here, the oil cooler is provided with an inlet 51b and an outlet 51a in one side tank 40 so that a U-turn type flow is possible, and a baffle 42 is formed in the tank 40 have. The condenser also has an inlet 52a and an outlet 52b formed in the tank 40, and a baffle 43 is provided so that the refrigerant can be turned on. The integrated heat exchanger 10 is also provided with a pair of header tanks 40 and 50, tubes 20 and 60, and a fin 30. In this patent, since the transmission oil flowing into the oil cooler is a liquid having a relatively low pressure and high viscosity, it is disclosed that the inlet and the outlet of the oil are located opposite the heat exchanger in order to increase the oil flow pressure. However, it is generally preferred that the inlet and outlet be located on the same side of the heat exchanger when mounted in a vehicle to form a U-shaped flow, which discloses a problem of pressure loss. In order to solve this problem, it is disclosed to change the area or shape of the end surface of the return tube.

In the oil cooler of the all-in-one type heat exchanger, if the hydraulic diameter is large, the performance of the oil cooler is lowered. On the contrary, when the oil cooler has a large pressure drop of the oil cooler, Is still present.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and an object of the present invention is to provide an integrated heat exchanger having an inlet and an outlet formed on one side of a heat exchanger and partitioned by a baffle, So as to improve the pressure drop amount.

According to an aspect of the present invention, there is provided a compressor comprising: a plurality of tubes each having a refrigerant and oil flowing therein and arranged in parallel at regular intervals in parallel with an air blowing direction; A pair of header tanks each having an inlet and an outlet for allowing the refrigerant and the oil to flow in and out, respectively, and having first and second baffles so that they can flow independently; And a pin interposed between the tubes to increase a heat transfer area between the tubes and the air flowing between the tubes; Wherein one of the header tanks has an inlet and an outlet adjacent to which the oil flows, and a third baffle is formed so that the oil can be turned on, Holes are formed so as to be bypassed.

The diameter D of the hole formed in the third baffle is equal to or smaller than the shortest distance L from the end of the tube inserted into the header tank to the inner surface of the header tank facing the end of the inserted tube.

The outer circumferential surface of holes formed in the baffle is a capping member by a predetermined distance from the end of the tube not in contact with the end of the insertion tube (ℓ _2), the outer circumferential surface of holes formed in the baffle is the closest distance from the inner surface of the header tank 1 mm or more apart.

The cross-sectional area of the hole formed in the third baffle is 3 to 7% of the cross-sectional area of the third baffle.

The present invention can improve the pressure drop amount by bypassing the oil by forming a hole of a predetermined size on the baffle side of the oil cooler in which the oil flows in a U-turn type, thereby solving the problem of durability of the transmission .

The present invention relates to an integrated heat exchanger in which an oil cooler and a condenser are integrally formed and minimizes a pressure drop generated in an oil cooler. In order to achieve this, an inlet and an outlet are provided in a header tank on one side, and are divided into baffles, thereby forming a U-turn type of oil cooler, in which holes are formed in the baffle. The holes can improve the durability of the transmission by allowing the introduced oil to be bypassed, thereby improving the pressure drop amount.

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a perspective view of an integral type heat exchanger according to the present invention, and FIG. 5 is a conceptual view showing oil flow on an oil cooler side in the integral type heat exchanger according to the present invention. FIG. 6 is a cross-sectional view showing a cross section of each tube in the integrated heat exchanger according to the present invention, and FIG. 7 is a sectional view showing a hole provided in the baffle in the integrated heat exchanger according to the present invention.

As shown in FIG. 4, the refrigerant stored in the condenser 500 is always stored in the liquid refrigerant, and the refrigerant is always sent to an expansion valve (not shown) It is assumed that a receiver dryer (Receiver-drier) 300 may be provided on the side of the tank 110 to store a required amount of refrigerant so that the cooling cycle can be smoothly operated corresponding to the circulation amount of the refrigerant.

As shown in FIGS. 4 and 5, the present invention is an integrated heat exchanger having an oil cooler 100 on the upper side and a condenser 500 on the lower side. It goes without saying that the position of the oil cooler 100 and the condenser 500 can be changed. In this type of integrated heat exchanger 1000, a plurality of tubes 160, 170, and 510, in which coolant and oil flow respectively, are arranged in parallel at regular intervals in parallel to the air blowing direction, And a pair of header tanks 110 and 120 having first and second baffles 300a and 300b so that they can independently flow, And a fin 520 interposed between the tubes 160, 170, and 510 to increase the heat transfer area with air flowing between the tubes.

In the oil cooler 100 of the integrated heat exchanger 1000 according to the present invention, the inlet 130 and the outlet 140 through which the oil flows to one of the header tanks 110 are formed adjacent to each other. The inlet 130 and the outlet 140 are formed in the same header tank 110 and the third baffle 150 is formed so that the oil can be turned on. Thereby forming a flow path. Here, the third baffle 150 is characterized in that a hole 151 is formed so that oil can be bypassed. Therefore, the flow path of the refrigerant flowing out through the inlet 530 and the outlet 540 of the condenser 500 is not particularly limited. That is, the refrigerant flowing along the tube 510 of the condenser 500 may complicate the flow by providing a plurality of partitions (not shown) in the tanks 110 and 120, and the inlet 530 and the outlet 540 are provided in the same tank 120, but it is needless to say that they are not.

The baffle 150 according to the present invention is characterized by the baffle 150 provided in the oil cooler 100 in the integrated heat exchanger 1000 based on the above technical idea.

7, the diameter D of the hole 151 formed in the third baffle 150 is larger than the diameter D of the inserted tube 160, 170 at the end of the tube 160, 170 inserted in the header tank 110 side. 170 are equal to or smaller than the shortest distance L to the inner surface of the header tank 110 facing each other. The outer circumferential surface of the hole 151 formed in the third baffle 150 is spaced apart from the end of the tubes 160 and 170 by a predetermined distance l ₂ so as not to contact the ends of the inserted tubes 160 and 170, The outer circumferential surface of the hole 151 formed in the third baffle 150 is separated from the inner surface of the header tank 110 by at least ₁ mm at the shortest distance l ₁ .

The cross-sectional area of the hole 151 formed in the third baffle 150 is 3 to 7% of the cross-sectional area of the third baffle 150.

Referring to FIG. 6, the shape of the tube 510 of the condenser 500 is divided into a plurality of channels 512 through a plurality of partitions 511 to improve the heat radiating area (contact area between the refrigerant and the tube). The tube 160 of the oil cooler 100 is partitioned into a plurality of channels 610 such that a plurality of channels 610 can be formed and a plurality of channels 610 are formed between the partition 610 and the partition 610, Another partition wall 163 of the same shape is provided to further improve the heat radiation area. After the oil flowing in the one side tank 110 flows through the tube 160 having the above-described shape, the oil flows from the other side tank 120 to the outlet 140 through the U-turn tube 170 . The U-turn tube 170 has a cross-sectional structure that is wider than the cross-sectional area of the tube 160 and has a single partition 171 and two channels 172 formed therein as shown in FIG. 6 (c).

The amount of pressure drop due to the holes 151 provided in the baffle 150 formed in the oil cooler 100 and the performance of the integrated type heat exchanger having the tubes 160, .

[Experimental Example]

[Table] Performance change according to hole diameter and position

6 (a), the hydraulic diameter (Dhc) thereof is 0.70 to 0.878 in relation to the tube 510 of the condenser 500, the tube of the oil cooler 100 6 (b), the hydraulic diameter Dho thereof is 0.715 to 1.136, and the shape of the return tube 170 is the same as that shown in Fig. 6 (c) The hydraulic diameter Dhc of the return tube 170 is in the range of 6.122 to 6.351 and the product of the hydraulic diameter Dhc of the condenser tube 510 and the tube 160 of the oil cooler 100 is 0.505 to 0.997 mm 2, The experiment was performed under the condition that the product of the diameter (Dhr) and the tube 160 of the oil cooler 100 was 4.328 to 5.576 mm < 2 >.

The table shows the case where the hole 151 is provided in the baffle 150 provided on the oil cooler 100 side and the case where the hole 151 is provided in the baffle 150. Specifically, And the performance change depending on the position. This is shown in FIG. 8 as a graph.

As can be seen from FIG. 8 and FIG. 7, the cross-sectional area of the hole 151 of the baffle 150 is 3 to 7% of the baffle cross-sectional area, The outer circumferential surface of the hole 151 and the end of the tubes 160 and 170 should not overlap. The optimum condition is that the shortest distance l ₁ from the inner surface of the header tank 110 to the inner peripheral surface of the hole 151 should be at least ₁ mm and the tubes 160 and 170 inserted into the header tank 110 To the outer circumferential surface of the hole 151 by a predetermined distance (? ₂ ).

1 is a conceptual view showing a conventional integrated heat exchanger;

2 is a cross-sectional view showing a section of the tube of Fig.

3 is a conceptual view showing another conventional integrated heat exchanger.

4 is a perspective view of the integral type heat exchanger according to the present invention.

5 is a conceptual diagram showing the oil flow on the oil cooler side in the integral type heat exchanger according to the present invention.

6 is a sectional view showing a cross section of each tube in the integral type heat exchanger according to the present invention.

7 is a sectional view showing a hole provided in the baffle in the integrated heat exchanger according to the present invention.

8 is a graph showing the performance and the pressure drop in the integrated heat exchanger according to the present invention.

※ Explanation of Main Drawings

1000: Heat exchanger 100: Oil cooler

500: condenser 110, 120: tank

130: inlet 140: outlet

150: baffle 151: hole

Claims (5)

A plurality of tubes (160, 170, 510) in which refrigerant and oil flow respectively and are arranged in parallel at regular intervals in parallel with the air blowing direction; The first and second baffles 300a and 300b are formed to have an inlet 130 and a outlet 530 and an outlet 140 and 540 for allowing the refrigerant and the oil to flow in and out, respectively, (110, 120); And a pin (520) interposed between the tubes (160, 170, 510) to increase a heat transfer area with air flowing between the tubes. (1000), wherein the heat exchanger The third baffle 150 is formed on one of the header tanks 110 so that the oil inlet 130 and the outlet 140 are adjacent to each other. The baffle 150 is formed with a hole 151 so that the oil can be bypassed, The diameter D of the hole 151 formed in the third baffle 150 is set such that the ends of the inserted tubes 160 and 170 are opposed to each other at the ends of the tubes 160 and 170 inserted into the header tank 110, (L) to the inner surface of the header tank (110). delete The method according to claim 1, The outer circumferential surface of the hole 151 formed in the third baffle 150 is spaced apart from the end of the tubes 160 and 170 by a predetermined distance l ₂ so as not to contact the ends of the inserted tubes 160 and 170 Characterized in that the heat exchanger is an integrated heat exchanger. The method of claim 3, Wherein an outer circumferential surface of the hole (151) formed in the third baffle (150) is spaced from the inner surface of the header tank (110) by a minimum distance of 1 mm or more. The method according to any one of claims 1, 3, and 4, Wherein a cross-sectional area of the hole (151) formed in the third baffle (150) is 3 to 7% of a cross sectional area of the third baffle (150).

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