JP2002310574A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a heat exchanger having an excellent performance. SOLUTION: The heat exchanger comprises a core 200 obtained by laminating a tube 210 for distributing a medium and waveform fins 220, and a tank 300 to which the ends of the tube are connected. The exchanger heat exchanges the medium by a heat transferred to the core. The exchanger is obtained by assembling the tube, the fins and the tank, heat treating them and brazing them. The exchanger is further obtained by providing a plurality of the cores, providing the fins to bridge over the plurality of the cores at the time of brazing, and cutting the fins after the brazing. In this case, the fins are each obtained by molding a plate 220A, and a cutout 221 corresponding to the cutting of the fin is provided on the plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a core formed of a tube through which a medium flows, a corrugated fin mounted on the tube, and a tank to which an end of the tube is connected, and heat transferred to the core. And a heat exchanger for exchanging heat of the medium.

[0002]

2. Description of the Related Art A heat exchanger such as a radiator of an automobile, a condenser in a refrigeration cycle, or an evaporator has a core formed by alternately stacking a plurality of tubes and a plurality of fins, and the ends of the tubes are connected. And a tank, and configured to perform heat exchange of the medium by heat transmitted to the tubes and the fins. The medium is taken in from the inlet provided in the tank, passes through the tube while exchanging heat with the heat transmitted through the core, and is then discharged to the outside from the outlet provided in the tank.

In recent years, a radiator of a refrigeration cycle has been known in which the internal pressure exceeds a critical point of a medium (that is, a refrigerant) depending on use conditions such as temperature. The critical point is a limit on the high temperature side where a gas layer and a liquid layer coexist, and is one of the end points of the vapor pressure curve. The pressure, temperature, and density at the critical point are the critical pressure, critical temperature, and critical density, respectively. The medium used for this type of radiator is, for example, CO ₂ .

Further, it is known that such a heat exchanger is provided with a plurality of cores arranged in parallel and the medium flowing in each core is opposed to each other to improve the performance.

[0005]

As described above, a heat exchanger having a plurality of cores is usually manufactured by separately manufacturing a plurality of cores and then connecting them. According to such a configuration, there is a problem that the number of manufacturing steps is increased and the production efficiency of the heat exchanger is deteriorated.

On the other hand, a heat exchanger in which a plurality of cores share a fin is also known. In this case, since the plurality of cores need not be separately formed, the production efficiency is improved.
However, according to the heat transmitted to the fins, heat is exchanged between the media flowing through the respective cores, and this causes a decrease in the performance of the heat exchanger.

[0007] The present invention has been made in view of such circumstances, and has as its object to easily obtain a heat exchanger having excellent performance.

[0008]

According to the first aspect of the present invention, a core formed by laminating a tube for flowing a medium and corrugated fins, and a tank to which an end of the tube is connected are provided. A heat exchanger for assembling the tube, the fins, and the tank, and heat-treating and assembling the tube, the fin, and the tank. Is a heat exchanger having a configuration in which a plurality of the cores are provided in parallel, the fins are provided so as to straddle the plurality of cores during the brazing, and the fins are cut after the brazing. According to this, a heat exchanger having excellent performance can be easily obtained.

That is, when the heat exchange between the media flowing through the respective cores is performed, this causes a decrease in the performance of the heat exchanger. However, according to the present invention, the fins extending over a plurality of cores are cut. And the heat transfer between the media can be cut off, and the performance of the heat exchanger can be satisfactorily ensured.

Further, since the fins are provided so as to straddle a plurality of cores at the time of brazing, the manufacturing process for assembling and brazing tubes, fins and tanks is simplified, and as a result, the production efficiency of the heat exchanger is reduced. Be improved.

According to a second aspect of the present invention, in the first aspect, the fin is formed by molding a plate, and the plate is provided with a notch corresponding to the cutting of the fin. With such a configuration, the fins are cut efficiently, and the production efficiency of the heat exchanger is further improved.

According to a third aspect of the present invention, in the second aspect, the fins are formed by forming the notches in the plate at a constant pitch and forming the plate at a constant pitch. When the forming pitch of the fin is L ₀ , the pitch of the notch is L ₁ , and n is a positive integer, these are heat exchangers configured to satisfy nL ₀ ≠ L ₁ . Then, the fins are cut more efficiently.

That is, according to the present invention, the cut portion of the fin is unevenly distributed in the uneven direction of the fin, and the cut portion is sparse relative to the stroke of the cutting means for cutting the fin. The configuration is distributed. Therefore, the load required for cutting is stable, and the operation of the cutting means is smooth.

According to a fourth aspect of the present invention, in the heat exchanger according to the second or third aspect, the length of the notch is in the range of 80 to 95% of the length of the plate. According to such a configuration, it is possible to favorably set the length of the cut portion of the fin.

That is, according to the present invention, the length of the portion to be cut is set within a practical range, and the strength of the fins at the time of assembling and brazing is ensured to some extent, and at the time of cutting the portion to be cut. Labor saving has been achieved.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the cutting means for cutting the fin is a heat exchanger configured to be an electric discharge machining. In addition, burrs and deformation due to cutting of the fins can be reduced as much as possible, and the processing accuracy of the heat exchanger is satisfactorily secured.

According to the invention described in claim 6 of the present application, the cutting means for cutting the fin is a heat exchanger configured to be a water jet processing.
Burrs and deformation due to cutting of the fins can be reduced as much as possible, and the processing accuracy of the heat exchanger can be satisfactorily secured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1 is an external perspective view of the heat exchanger, FIG. 2 is a schematic configuration diagram of the heat exchanger, FIG. 3 is an explanatory view of the heat exchanger at the time of brazing, FIG. FIG. 5 is a plan view of a plate constituting the fin, and FIG. 6 is an explanatory view showing cutting of the fin.

The heat exchanger 1 is a radiator used in a refrigeration cycle for cooling the interior of an automobile. The medium is C
O ₂ is adopted, the heat exchanger 1 the pressure is the operating conditions such as air temperature, exceed the critical point of the medium.

This heat exchanger has a core 200 formed by alternately stacking flat tubes 210 and corrugated fins 220 provided with louvers, and a tank provided with a hole into which the end of the tube 210 is inserted. 300, and the medium flowing through the tube 210 exchanges heat with the heat transferred to the core 200.

The upper and lower sides of the core 200 are provided with side plates 400 as reinforcing members. Both ends of each side plate 400 are supported by the tank 300, respectively.

The heat exchanger 1 has a configuration in which a plurality of cores 200 are provided side by side, and the directions of the media flowing through the cores 200 are opposite to each other. Each of the plurality of cores 200 is provided with a tank 300. Adjacent side plates 400 or tanks 300 are supported by brackets not shown.

Each of the tubes 210 is a flat extrusion member having a plurality of medium flow paths.

Further, each tank 300 is a cylindrical member having both ends closed and a hole for inserting the end of the tube 210 at a predetermined pitch.
Inlet 310 for inflow of medium, outlet 3 for outflow of medium
20 and a communication part 330 for communicating the predetermined tanks 300 with each other.

The medium is introduced into the tank 300 from the inlet 310, flows through the tube 210 while exchanging heat by the heat transmitted to the core 200, and is discharged to the outside from the outlet 320 of the other tank 300. You.

Then, the tube 210, the fin 220,
Tank 300, inlet section 310, outlet section 320, communicating section 3
30 and the side plate 400 are members made of aluminum or an aluminum alloy, respectively, and are integrally assembled using a jig, and the assembly is heated in a furnace and brazed. Further, regarding such brazing, a brazing material and a flux are provided in advance at key points of each member.

Further, in the heat exchanger 1 of the present embodiment, the fins 220 are provided so as to straddle the plurality of cores 200 during brazing (see FIG. 3), and the fins 220 are cut after brazing (FIG. 4). reference). The fins 220 are attached to each core 200
Disconnected between. Therefore, the heat transfer between the media flowing through the cores 200 by the fins 220 is cut off, and the heat exchange performance is sufficiently ensured.

In FIG. 4, the fin 220 is cut to some extent from one side in consideration of an increase in the temperature difference of the medium from the inlet 310 to the outlet 320. Alternatively, the fins 220 may be completely separated for each core.

Furthermore, the fins 220 of the present example is obtained by molding a strip-shaped plate 220a at a constant pitch _{L 0} (see FIG. 5).

[0030] plate 220a is provided with a notch 221 corresponding to the cutting of the fin 220 with a constant pitch _{L 1.} A portion to be cut 222 of the fin 220 is provided between the notch 221 and the notch 221. The notch 22
The length of 1 is 80 to 9 with respect to the length of the plate 220a.
It is set in the range of 5%.

[0031] In this example, molding pitch _{L 0} of the plate 220a, the pitch _{L 1} of and sets the range of 1.6～4.0Mm, notch 221 is set slightly smaller than _{L 0} . Further, when n is a positive integer, they satisfy the relationship of nL ₀ ≠ L ₁ .

The cutting of the fins 220 is performed by electric discharge machining (see FIG. 6). In the electric discharge machining, the plate-shaped machining electrode A is moved in the laminating direction of the tube 210 and the fin 210,
The cut portion 222 of the fin 220 is configured to be cut according to the stroke of the processing electrode A. The circles in FIG. 6 indicate the positions of the cut portions 222.

According to such a configuration, the fins 220 can be cut efficiently. In particular, if the fins 220 are cut by electric discharge machining, burrs and deformation accompanying cutting of the fins 220 can be reduced as much as possible.

As for electric discharge machining, wire cutting using a wire as a machining electrode is known in addition to using a plate-like machining electrode A. Wire cutting is a method of processing while continuously supplying a metal wire having a diameter of about 0.02 to 0.35 mm as a processing electrode, and has an advantage that it is not necessary to consider the consumption of the electrode. That is, the electric discharge machining for cutting the fins 220 may employ wire cutting.

As the cutting means for cutting the fins 220, water jet machining may be employed in addition to the electric discharge machining described above. Water jet processing is a means for processing a workpiece using a high-pressure fountain flow. Burrs and deformation due to cutting of the fins 220 can be reduced as much as possible by water jet processing.

As described above, the heat exchanger of this embodiment is
A refrigeration cycle for air conditioning inside a vehicle that is extremely rationally configured as a radiator whose internal pressure exceeds the critical point of the medium, ensuring excellent heat exchange performance and easily manufacturable. Can be used very suitably as a radiator.

In this embodiment, the heat exchanger in which the internal pressure exceeds the critical point of the medium has been described. However, the configuration of this embodiment in which the fins are cut can also be applied to a condenser or the like which constantly condenses the medium. . In particular, in the case of a condenser, a supercooling section may be provided by connecting a liquid receiver to the tank. The subcooling section is the part of the core that further cools the condensing medium.

[0038]

According to the first aspect of the present invention, the core includes a core formed by laminating a tube for flowing a medium and corrugated fins, and a tank to which an end of the tube is connected. Heat exchange of the medium by heat transmitted to the tube, the tube, the fins, and the tank are assembled, and heat-treated and brazed in the heat exchanger, the heat exchanger is the core It is a heat exchanger having a configuration in which the fins are provided so as to straddle the plurality of cores during the brazing, and the fins are cut after the brazing. A heat exchanger having excellent performance can be easily obtained.

According to a second aspect of the present invention, in the first aspect, the fin is formed by forming a plate, and the plate is provided with a notch corresponding to the cutting of the fin. With such a configuration, the fins can be cut efficiently, and the production efficiency of the heat exchanger can be further improved.

According to a third aspect of the present invention, in the second aspect, the fins are formed by providing the notches in the plate at a constant pitch and forming the plate at a constant pitch. When the forming pitch of the fin is L ₀ , the pitch of the notch is L ₁ , and n is a positive integer, these are heat exchangers configured to satisfy nL ₀ ≠ L ₁ . Thus, the fins can be cut more efficiently.

According to a fourth aspect of the present invention, in the heat exchanger according to the second or third aspect, the length of the notch is in the range of 80 to 95% of the length of the plate. According to such a configuration, the length of the portion to be cut in the fin can be favorably set.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the cutting means for cutting the fin is a heat exchanger configured to be an electric discharge machining. Thus, burrs and deformation due to the cutting of the fins can be reduced as much as possible, and the processing accuracy of the heat exchanger can be satisfactorily secured.

According to the invention as set forth in the sixth aspect of the present invention, the cutting means for cutting the fin is a heat exchanger configured to be a water jet process.
Burrs and deformation due to cutting of the fins can be reduced as much as possible, and the processing accuracy of the heat exchanger can be satisfactorily secured.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a heat exchanger according to the embodiment of the present invention.

FIG. 3 is an explanatory view of a heat exchanger during brazing according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a heat exchanger with fins cut off according to the embodiment of the present invention.

FIG. 5 is a plan view of a plate constituting a fin according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing cutting of a fin according to the embodiment of the present invention.

[Explanation of symbols]

1 pitch of the heat exchanger 200 the core 210 tube 220 fins 220a plate 221 notch 222 to be cut portion 300 tank 310 inlet 320 outlet 330 communicating portion 400 side plate A working electrode L ₀ fin forming pitch L ₁ notch of

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Furuya 39, Higashihara, Chiyo, Oga-gun, Osato-gun, Saitama Prefecture Inside the control of Zexel Valeo Climate Control (72) Takafumi Umehara, Chiyo-ji, Konan-cho, Osato-gun, Saitama 39 Higashihara, in the Xexel Valeo Climate Control (72) Inventor Yuichi Mori Yuichi Mori, Chiyo, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture 39 In the Xexel Valeo Climate Control, (72) Inventor Akihiko Takano Konan, Osato-gun, Saitama 39 Chiyo, Higashihara, Chiyo-machi, F-term (reference) in Xexel Valeo Climate Control Co., Ltd. 3L103 AA06 AA37 BB38 CC22 CC40 DD08 DD34 DD42

Claims (6)

[Claims] 1. A core formed by laminating a tube through which a medium flows and corrugated fins, and a tank to which an end of the tube is connected, wherein heat exchange of the medium is performed by heat transmitted to the core. Wherein the tube, the fins, and the tank are assembled, and the heat exchanger is heated and brazed. The heat exchanger includes a plurality of the cores. The fin is provided so as to straddle the plurality of cores, and the fin is cut after the brazing. 2. The fin is formed by molding a plate,
The heat exchanger according to claim 1, wherein the plate has a notch corresponding to the cutting of the fin. 3. The fin, wherein the notches are provided on the plate at a constant pitch, and the plate is formed at a constant pitch. The fin forming pitch is L ₀ , and the notch pitch is When L ₁ and n are positive integers, these are nL ₀ ≠
The heat exchanger according to claim 2, wherein L ₁ is satisfied. 4. The heat exchanger according to claim 2, wherein the length of the notch is in the range of 80 to 95% of the length of the plate. 5. The heat exchanger according to claim 1, wherein the cutting means for cutting the fin is an electric discharge machining. 6. The heat exchanger according to claim 1, wherein the cutting means for cutting the fin is a water jet process.