JP2002062062A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of effecting the heat exchange of a medium efficiently. SOLUTION: The heat exchanger is provided with a plurality of tubes 200, through which a medium flows from one end to the other end, a first tank 410, connected to one end of the tubes, and a second tank 420, connected to the other end of the tubes while the volume of the first tank is larger than that of the second tank. In this case, the tube is a flat type tube having a plurality of flow passages 210 and one end 200a of the tube is formed so as to have a recessed shape in the orthogonal projection of the widthwise direction of the same while the other end 200b is formed so as to have a projected shape in the orthogonal projection of the widthwise direction. Further, the end part of the tubes are provided with a projection 220 between the flow passages.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for performing heat exchange of a medium by heat transmitted to a tube.

[0002]

2. Description of the Related Art In recent years, compression refrigeration cycles include:
A medium that uses CO ₂ as a medium (that is, a refrigerant) and has a pressure inside a radiator exceeding a critical point of the medium is used. Refrigeration cycles employing CO ₂ as a medium are described in, for example, JP-A-11-94380 and JP-A-11-1420.
No. 07, JP-A-11-226684 and the like.

A heat exchanger used as a radiator of such a refrigeration cycle is configured by alternately stacking tubes and fins and connecting the ends of the tubes to a tank.

[0004] The tank is provided with an inlet for introducing the medium and an outlet for discharging the medium. The medium is introduced into the tank from the inlet and exchanges heat by heat transmitted to the tubes and fins. After flowing through the tube while discharging, it is discharged from the outlet to the outside of the tank.

[0005]

However, as described above, a radiator in which the internal pressure exceeds the critical point of the medium requires extremely high pressure resistance.

However, for such a radiator,
There is a demand for a configuration that can efficiently cool the medium while considering high pressure resistance.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a heat exchanger capable of efficiently performing heat exchange of a medium.

[0008]

According to the first aspect of the present invention, a plurality of tubes for flowing a medium from one end to the other end are connected to one end of the tube. A heat exchanger for exchanging the medium by heat transmitted to the tube, the heat exchanger including a first tank and a second tank connected to the other end of the tube; The heat exchanger has a configuration larger than the capacity of the tank. According to such a configuration, the heat exchange of the medium is performed efficiently.

That is, if the volume of the first tank is small,
Although the pressure difference inside the first tank becomes remarkable and the distribution of the medium to the plurality of tubes becomes uneven, in the present invention, the volume of the first tank is set to be larger than the volume of the second tank. Disadvantages are improved, and as a result, the heat exchange efficiency is improved.

[0010] The invention described in claim 2 of the present application comprises a tube through which a medium flows from one end to the other end, and a tank into which the end of the tube is inserted and connected. In a heat exchanger that performs heat exchange of the medium by transmitting heat, the tube is a flat shape having a plurality of flow paths, and one end of the tube is
The heat exchanger has a configuration in which the orthogonal projection in the width direction is formed in a concave shape. According to such a configuration, heat exchange of the medium is performed efficiently.

That is, since the one end of the tube has a concave orthogonal projection in the width direction, turbulence of the medium inside the tank is reduced, and the medium is guided smoothly. Therefore, the flow of the medium is efficiently secured, and the heat exchange efficiency is improved.

According to a third aspect of the present invention, in the second aspect, the other end of the tube is a heat exchanger having a configuration in which an orthogonal projection in the width direction is formed in a convex shape. According to the configuration, the production of the tube is saved.

That is, when a material of a tube continuous in the longitudinal direction such as an extruded member is cut into a predetermined length, if one end of the tube is formed in a concave shape, the remaining portion is formed in a convex shape. Then, the remaining portion formed in the convex shape is used as the other end of another tube, so that the surplus portion of the material is omitted, and a plurality of tubes are efficiently manufactured.

According to a fourth aspect of the present invention, there is provided a tube for flowing a medium from one end to the other end, and a tank connected to the end of the tube, wherein heat is transmitted to the tube. In the heat exchanger that performs heat exchange of the medium, the tube is a flat shape having a plurality of flow paths, and for an end of the tube,
A heat exchanger having a configuration in which a protrusion is provided between the flow paths. According to such a configuration, heat exchange of the medium is performed efficiently.

That is, according to the protrusion between the flow paths, the flow of the medium is regulated, and the medium is smoothly guided to the end opening of the flow path. Therefore, the flow of the medium is efficiently secured, and the heat exchange efficiency is improved.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the heat exchanger is a radiator of a refrigeration cycle, and an internal pressure is higher than a critical point of the medium. It is a heat exchanger with a round configuration.

Here, the critical point is the limit on the high temperature side (ie, the limit on the high pressure side) in which the gas layer and the liquid layer coexist.
One end of the vapor pressure curve. The pressure, temperature, and density at the critical point are the critical pressure, critical temperature, and critical density, respectively. If the pressure is above the critical point of the medium inside the radiator, the medium will not condense.

That is, the present heat exchanger can efficiently exchange heat with the medium, and can be suitably used as a radiator whose internal pressure exceeds the critical point of the medium. .

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The refrigeration cycle 1 of the present embodiment shown in FIG. 1 is for cooling in a vehicle mounted on a vehicle. CO ₂ is used as the medium.

The refrigeration cycle 1 includes a compressor 2 for compressing a medium, a radiator 3 for cooling the compressed medium, a decompressor 4 for decompressing the cooled medium and expanding the same, It comprises an evaporator 5 that evaporates and an accumulator 6 that is arranged downstream of the evaporator 5 and upstream of the compressor 2, and the medium is circulated by the power of the compressor 2. The pressure inside the radiator 3 exceeds the critical point of the medium depending on the use conditions such as the temperature.

Further, reference numeral 7 in FIG. 1 denotes an internal heat exchanger.
The internal heat exchanger 7 exchanges heat between the high-temperature medium and the low-temperature medium in order to improve the efficiency of the refrigeration cycle 1.

As shown in FIGS. 2 to 5, the radiator 3, which is a heat exchanger of the present embodiment, has tubes 200 and fins 300 stacked alternately and in parallel with each other.
Of the first tank 410 and the second tank 4
20.

Above and below the layer comprising the tubes 200 and the fins 300, side plates 500 as reinforcing members are provided.

The first tank 410 is provided with an inlet 411 for introducing a medium, and the second tank 420 is provided with an outlet 421 for discharging a medium.

The inlet portion 411 and the outlet portion 421 are formed by providing holes at important parts of the first tank 410 and the second tank 420 and connecting pipe-like joints to the holes.

A pipe connecting the radiator 3 and the compressor 2 is connected to the inlet 411, and a pipe connecting the radiator 3 and the pressure reducer 4 is connected to the outlet 421. Also, the entrance 41
The direction of 1 and the outlet 421 is appropriately set in consideration of the connection with the pipe.

The medium is supplied from the inlet 411 to the first tank 41.
0 and the tube 200 and the fin 300
After flowing through the tube 200 while being cooled by the heat transmitted to the second tank 420, the gas is discharged from the outlet 421 of the second tank 420 to the outside.

First tank 410 and second tank 420
Is a tubular shape with both ends closed, and each tube 20
0 is a flat shape having a plurality of small flow paths.

Each of the tubes 200 is connected by inserting one end into the first tank 410 and inserting the other end into the second tank 420. First
The tank 410 and the second tank 420 are provided with holes for inserting the ends of the tubes 200 at a predetermined pitch in the longitudinal direction.

Then, the tube 200, the fin 300,
The first tank 410, the second tank 420, and the side plate 500 are assembled using a jig, and the assembled body is heat-treated in a furnace and brazed to be integrally formed.

In such a radiator 1, the above-described inlet 411 is provided with the first tank 41 in consideration of the flow of the medium.
0 is provided near the center. In addition, the outlet 42 described above
1 is provided near the lower end of the second tank 420.

Furthermore, the inner diameter _{L 1} of the first tank 410 is set larger than the inner diameter _{L 2} of the second tank 420,
The capacity of the first tank 410 is set to be larger than the capacity of the second tank 420. On the other hand, the length of the first tank 410 is the same as the length of the second tank.

However, by setting the volume of the first tank 410 of the present embodiment to a range of about 1.2 to 3.0 times the volume of the second tank 420, the inside of the first tank 410 in the longitudinal direction can be reduced. The pressure difference is configured to be reduced.

In particular, when the pressure difference due to the distance from the inlet portion 411 inside the first tank 410 is remarkable, the flow rate of the medium distributed from the inside of the first tank 410 to the plurality of tubes 200 is determined by each tube. The variation increases every 200.

If the flow rate of the medium is greatly different for each tube 200, heat exchange of the medium is excessive in the tube 200 having a low flow rate, while heat exchange of the medium is satisfactory in the tube 200 having a high flow rate. As a result, the heat exchange efficiency of the medium is reduced as a whole.

In this respect, in the present embodiment, since the difference in pressure inside the first tank 410 is reduced, the flow speed of the medium distributed to each tube 200 is averaged, and the heat exchange of the medium is performed efficiently.

The thickness of the first tank 410 is set to be somewhat larger than the thickness of the second tank in order to ensure the same pressure resistance as the second tank 420.

As described above, according to the radiator of the present embodiment, since the volume of the first tank is larger than the volume of the second tank, heat exchange of the medium can be performed efficiently.

That is, if the volume of the first tank is small,
Although the pressure difference inside the first tank becomes remarkable and the distribution of the medium to the plurality of tubes becomes uneven, in the present invention, the volume of the first tank is set to be larger than the volume of the second tank. Can be improved, and as a result, the heat exchange efficiency can be improved.

Further, the radiator of the present embodiment can efficiently exchange heat with the medium, and can be suitably used because the internal pressure exceeds the critical point of the medium.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on.

As shown in these figures, the radiator 3 of this embodiment
Generally comprises two radiators as described above.

That is, the radiator 3 is connected to the tube 20
The first tank 410 and the second tank 420 to which both ends of the tube 0 are connected, respectively, and the third tank 430 and the fourth tank 4 to which both ends of another tube 200 are connected, respectively.
40, and communicates with the outlet 421 of the second tank 420 and the inlet 431 of the third tank 430.
A pipe connecting the radiator 3 and the pressure reducer 4 is connected to the outlet 441 of the tank 440.

The capacity of the third tank 430 is
The volume is set to be larger than 40. In particular, in the present example, the first tank 410 and the third tank 430 are common members, and the second tank 420 and the fourth tank 440 are common members.

The first tank 410 and the fourth tank 4
40, and the second tank 420 and the third tank 430
Are supported side by side with each other.

The medium introduced into the first tank 410 flows through the tube 200 and then flows through the second tank 420.
Is introduced into the third tank 430 from the outlet portion 421 of the third tank 430. Then, the medium introduced into the third tank 430 flows through another tube 200 and then flows through the fourth tank 4.
It is discharged to the outside from the outlet part 441 of 40.

Since other basic configurations are the same as those of the above-described specific example, common members are denoted by the same reference numerals, and description thereof is omitted.

As described above, the radiator of the present embodiment is of the side-by-side type, and in such a radiator, the medium of the first tank is set larger than the volume of the second tank. Can improve the heat exchange efficiency.

In this embodiment, the volume ratio of the first tank and the second tank and the volume ratio of the third tank and the fourth tank are the same, but the flow rate inside the third tank is The volume of the third tank may be slightly larger than the volume of the fourth tank, since it is surely slower than the internal flow velocity. Alternatively, the volume of the third tank may be the same as the volume of the fourth tank.

Next, a third embodiment of the present invention will be described with reference to FIGS.
It will be described based on.

As shown in these figures, the radiator 3 of this embodiment
The position of the first tank 410 and the fourth tank 440 and the position of the second tank 420 and the third tank 430 with respect to the second specific
Are slightly shifted in the longitudinal direction.

According to such a configuration, the first tank 41
Unnecessary heat exchange between the media in the zero and fourth tanks 440 can be appropriately avoided. Further, the thickness of the radiator 3 can be reduced.

Since other basic configurations are the same as those in the above-described specific example, common members are denoted by the same reference numerals, and description thereof is omitted.

As described above, the positions of the first and fourth tanks and the positions of the second and third tanks may be shifted in the longitudinal direction of the tube.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.

As shown in these figures, the tube 200 of this example is a flat tube having a plurality of flow channels 210 in the width direction, and is a metal extrusion member provided with the plurality of flow channels 210. 100 is cut into a predetermined length.

The extruding member 100 is cut by making a cut 110 at a predetermined position with a pair of blades A and pulling the cut in the longitudinal direction. Here, the cut 110
Is short of reaching the flow channel 210.

The pair of blades A are configured to move in the thickness direction of the pushing member 100 and sandwich both sides of the pushing member 100 from both sides.

According to such a configuration, it is possible to prevent unnecessary deformation such as the end opening of the flow path 210 being scooped.

In the case of this example, a protrusion 220 is formed between the flow paths 210 at the end of the tube 200.

The protrusion 220 of the present embodiment is formed by raising the space between the flow paths 210 due to the viscosity of the metal when the extrusion member 100 is pulled and cut.

Since such a protrusion 220 appropriately regulates the flow of the medium, the medium is smoothly guided to the end opening of the flow path 210.

Since other basic configurations are the same as those of the above-described specific example, common members are denoted by common reference numerals, and description thereof is omitted.

As described above, according to the radiator of this embodiment, the tube is a flat tube having a plurality of flow paths, and the extruded member is cut to a predetermined length. Since a cut is made in a predetermined portion and cut by pulling it in the longitudinal direction, it is possible to prevent the end opening of the flow path from being unnecessarily deformed.
Heat exchange of the medium can be performed efficiently.

That is, when such an extruded member is sheared by, for example, a press or the like, the end opening of the flow path is unnecessarily deformed due to the shear stress, and this may cause deterioration of the flow of the medium. However, in the present invention, such inconvenience can be avoided.

Further, according to the radiator of the present embodiment, the tube has a flat shape having a plurality of flow paths,
Since a protrusion is provided between the flow paths at the end of the tube, heat exchange of the medium can be performed efficiently.

That is, according to the protrusion between the flow paths, the flow of the medium can be regulated and the medium can be smoothly guided to the end opening of the flow path. Therefore, the flow of the medium can be efficiently secured, and the heat exchange efficiency can be improved.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
5 will be described.

As shown in these figures, the tube 200
About one end 20 connected to the first tank 410
0a forms an orthogonal projection in the width direction in a concave shape. Also,
The other end 200b connected to the second tank 420 is formed in a convex shape.

One end 200 a formed in a concave shape and the other end 200 b formed in a convex shape are connected to the tube 2.
It presents an isosceles triangle with the center in the width direction of 00 as the vertex.

Further, the notch 110 is formed in the pushing member 100.
Is used according to the concave shape and the convex shape.

The other basic structure is the same as that of the above-described specific example, and thus the same reference numerals are given to the common members, and the description is omitted.

As described above, according to the heat exchanger of this example,
The tube is of a flat shape having a plurality of flow paths,
Since the one end of the tube is formed with a concave projection in the width direction, heat exchange of the medium can be performed efficiently.

That is, since the one end of the tube has a concave orthogonal projection in the width direction, turbulence of the medium inside the tank can be reduced, and the medium can be guided smoothly. Therefore, the flow of the medium can be efficiently secured, and the heat exchange efficiency can be improved.

Further, according to the heat exchanger of the present embodiment, the other end of the tube is formed with a convex orthographic projection in the width direction, so that the production of the tube can be saved.

That is, when a material of a tube continuous in the longitudinal direction such as an extruded member is cut to a predetermined length, if one end of the tube is formed in a concave shape, the other portion is formed in a convex shape. Then, by setting the remaining portion formed in the convex shape as the other end of another tube, an excess portion of the material can be omitted, and a plurality of tubes can be manufactured efficiently.

Next, a sixth embodiment of the present invention will be described with reference to FIGS.

As shown in these figures, the tube 200 of this example has one end 200a formed in a concave shape and the other end 200b formed in a convex shape exhibiting a curve.

Since other basic configurations are the same as those of the above-described specific example, common members are denoted by the same reference numerals and description thereof is omitted.

As described above, one end of the tube formed in a concave shape and the other end formed in a convex shape may be curved. That is, the specific shapes of the concave and convex shapes can be arbitrarily set, for example, by corresponding to the structure of the first tank and the second tank.

[0082]

According to the first aspect of the present invention, there are provided a plurality of tubes for flowing a medium from one end to the other end, a first tank connecting one end of the tubes, A heat exchanger for exchanging heat of the medium by heat transmitted to the tube, wherein the volume of the first tank is larger than the volume of the second tank. This is a heat exchanger having a large configuration, and according to such a configuration, heat exchange of the medium can be performed efficiently.

The invention described in the second aspect of the present invention comprises a tube through which a medium flows from one end to the other end, and a tank into which the end of the tube is inserted and connected. In a heat exchanger that performs heat exchange of the medium by transmitting heat, the tube is a flat shape having a plurality of flow paths, and one end of the tube is
The heat exchanger has a configuration in which the orthogonal projection in the width direction is formed in a concave shape. According to such a configuration, heat exchange of the medium can be performed efficiently.

According to a third aspect of the present invention, in the second aspect, the other end of the tube is a heat exchanger having a configuration in which an orthogonal projection in the width direction is formed in a convex shape. According to the configuration, the production of the tube can be saved.

The invention according to a fourth aspect of the present invention comprises a tube through which a medium flows from one end to the other end, and a tank connecting the ends of the tube, wherein heat is transmitted to the tube. In the heat exchanger that performs heat exchange of the medium, the tube is a flat shape having a plurality of flow paths, and for an end of the tube,
The heat exchanger has a configuration in which a protrusion is provided between the flow paths. According to such a configuration, heat exchange of the medium can be performed efficiently.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the heat exchanger is a radiator of a refrigeration cycle, and an internal pressure is higher than a critical point of the medium. This is a heat exchanger with a rotating configuration. That is, the present heat exchanger can efficiently perform heat exchange of the medium, and can be suitably used as a radiator in which the internal pressure exceeds the critical point of the medium.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a refrigeration cycle according to a specific example of the present invention.

FIG. 2 is a front view showing a radiator according to a specific example of the present invention.

FIG. 3 is a top view showing a radiator according to a specific example of the present invention.

FIG. 4 is an explanatory view showing a tube and a first tank according to a specific example of the present invention.

FIG. 5 is an explanatory view showing a tube and a second tank according to a specific example of the present invention.

FIG. 6 is a front view showing a radiator according to a specific example of the present invention.

FIG. 7 is a top view showing a radiator according to a specific example of the present invention.

FIG. 8 is a front view showing a radiator according to a specific example of the present invention.

FIG. 9 is a top view showing a radiator according to a specific example of the present invention.

FIG. 10 is an explanatory view showing cutting of an extrusion member according to a specific example of the present invention.

FIG. 11 is an explanatory view showing cutting of an extrusion member according to a specific example of the present invention.

FIG. 12 is an explanatory view showing cutting of an extrusion member according to a specific example of the present invention.

FIG. 13 shows a tube and a first tube according to an embodiment of the present invention.
It is explanatory drawing which shows a tank.

FIG. 14 shows a tube and a second tube according to an embodiment of the present invention.
It is explanatory drawing which shows a tank.

FIG. 15 is an explanatory view showing cutting of an extrusion member according to a specific example of the present invention.

FIG. 16 shows a tube and a first tube according to an embodiment of the present invention.
It is explanatory drawing which shows a tank.

FIG. 17 shows a tube and a second tube according to the embodiment of the present invention.
It is explanatory drawing which shows a tank.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 2 Compressor 3 Radiator (heat exchanger) 4 Decompressor 5 Evaporator 6 Accumulator 7 Internal heat exchanger 100 Extrusion member 110 Cut 200 Tube 200a One end 200b The other end 210 Flow path 220 Protrusion Part 300 fin 410 first tank 411 inlet part 420 second tank 421 outlet part 430 third tank 431 inlet part 440 fourth tank 441 outlet part 500 side plate A blade L ₁ inner diameter of first tank L ₂ inner diameter of second tank

Claims (5)

[Claims] 1. A plurality of tubes through which a medium flows from one end to the other end, a first tank connecting one end of the tubes, and a second tank connecting the other ends of the tubes. A heat exchanger comprising two tanks and exchanging heat of the medium by heat transmitted to the tube, wherein the capacity of the first tank is larger than the capacity of the second tank. 2. A tube through which a medium flows from one end to another end, and a tank into which the end of the tube is inserted and connected, wherein heat transmitted to the tube exchanges heat of the medium. In the heat exchanger to be performed, the tube is a flat shape having a plurality of flow paths, and one end of the tube is formed such that an orthogonal projection in the width direction is formed in a concave shape. . 3. The heat exchanger according to claim 2, wherein the other end of the tube has an orthogonal projection in a width direction formed in a convex shape. 4. A heat exchange, comprising: a tube for flowing a medium from one end to the other end; and a tank connecting the ends of the tube, wherein heat transfer of the medium is performed by heat transmitted to the tube. The heat exchanger according to claim 1, wherein the tube has a flat shape having a plurality of flow paths, and a projection is provided between the flow paths at an end of the tube. 5. The heat exchanger according to claim 1, wherein the heat exchanger is a radiator of a refrigeration cycle, and an internal pressure is higher than a critical point of the medium. .