WO2013105490A1

WO2013105490A1 - Heat exchanger

Info

Publication number: WO2013105490A1
Application number: PCT/JP2013/000025
Authority: WO
Inventors: アウン太田; 中村　貢; 鳥越　栄一; 聡也長沢
Original assignee: 株式会社デンソー
Priority date: 2012-01-12
Filing date: 2013-01-09
Publication date: 2013-07-18
Also published as: JP2013142515A; JP5772608B2

Abstract

Tubes (3) are formed in a flat tube shape, protrusions (7) which protrude toward the outside of the tubes are formed on one flat surface of each of the tubes, and recesses (8) which are recessed toward the inside of the tube are formed in the other flat surface of the tube. If one of the tubes which are adjacent to each other with a fin (4) provided therebetween is referred to as a first tube (3a), the other of the tubes is referred to as a second tube (3b), and both the distance between protrusions adjacent to each other in the longitudinal direction of the tube and the distance between the recesses adjacent to each other in the longitudinal direction of the tube are referred to as a dimple pitch (DP), the first tube and the second tube are arranged so that the one flat surface of the first tube and the other flat surface of the second tube face each other across the fin, and so that the protrusions provided on the first tube and the recesses provided in the second tube are arranged in such a manner that the positions of the protrusions and recesses in the longitudinal direction of the tubes are displaced from each other by half the dimple pitch.

Description

Heat exchanger

Cross-reference of related applications

This disclosure is based on Japanese Application No. 2012-3903 filed on January 12, 2012, the contents of which are incorporated herein.

The present disclosure relates to a heat exchanger suitable for, for example, a radiator used in a vehicle engine cooling system, or a refrigerant condenser, a refrigerant evaporator, a heater core, etc. for air conditioning.

The heat exchanger disclosed in Patent Document 1 is, for example, a heater core for heating mounted on an automobile. As shown in FIG. 9, a tube 100 having a flat cross-sectional shape and a flat surface ( Air that passes through the heat dissipating core by heat exchange with the engine coolant flowing through the inside of the tube 100, that is, into the vehicle interior. The air to be blown is heated.

As shown in FIG. 10, the fin 110 is a corrugated fin that is bent into a wave shape with a constant fin pitch FP, and a louver 120 (see FIG. 9) is formed on the fin surface. This louver 120 has a function of improving the heat transfer performance on the air side by disturbing the flow of air flowing on the fin surface, but when air passes through a part where the louver 120 is not formed (referred to as a non-louver part), The effect of improving heat transfer performance is reduced.

Therefore, in Patent Document 1, a convex portion 130 protruding toward the outside of the tube 100 is provided on one of the flat surfaces of the tube 100, thereby increasing the ventilation resistance of the air flowing through the non-louver portion, thereby forming the louver 120. Techniques have been disclosed for increasing the flow rate of air flowing through a defined area.

Also, a concave portion 140 that is recessed toward the inside of the tube 100 is provided on the other flat surface of the tube 100. Providing this recess 140 increases the heat dissipation area on the engine coolant side, and the flow path in the tube 100 has a meandering shape, so that the effect of stirring the engine coolant flowing inside the tube 100 can be obtained. . As a result, the heat transfer performance on the engine coolant side can be improved. The convex portion 130 and the concave portion 140 are formed in a plurality of stages at the same pitch as the fin pitch FP in the longitudinal direction of the tube 100 (the left-right direction in FIG. 10), that is, the direction in which the engine coolant flows.

However, in the heat exchanger disclosed in Patent Document 1, the concave portion 140 is formed on the other flat surface of the tube 100, and the bent portion of the fin 110 (joint portion with the tube 100) is formed at the portion where the concave portion 140 is formed. Is placed. In this case, as shown in FIG. 10, a gap is formed between the bent portion of the fin 110 and the concave portion 140 in the portion where the concave portion 140 is formed, so that a portion where the fin 110 and the tube 100 cannot be joined is generated. As a result, the fin efficiency is lowered and the performance improvement of the heat exchanger is suppressed.

JP 2011-43322 A

An object of the present disclosure is to provide a heat exchanger that can improve performance by increasing fin efficiency.

According to an example of the present disclosure, a plurality of tubes arranged in parallel at a predetermined interval, a fin arranged between adjacent tubes and joined to the surface of the tube, and a longitudinal direction of the tube In a heat exchanger having a pair of header tanks into which both end portions are inserted and exchanging heat between a fluid flowing inside the tube and a fluid flowing outside the tube, the fin has a certain fin pitch. The corrugated fin is bent into a corrugated shape, and the tube is formed in a flat tube shape having a cross-sectional shape perpendicular to the longitudinal direction having a major axis and a minor axis, and one of the flat surfaces facing the minor axis direction. A convex portion protruding toward the outside of the tube is provided, and a concave portion recessed toward the inside of the tube is provided on the other flat surface.

The convex portion and the concave portion are arranged in a plurality of stages at the same pitch as the fin pitch in the longitudinal direction of the tube. One tube adjacent to the fin is called a first tube, and the other tube is called a second tube. When the interval between the convex portions and the concave portions adjacent to each other in the longitudinal direction is referred to as a dimple pitch, the first tube and the second tube have one flat surface of the first tube and the other flat portion of the second tube. The convex portion provided on the first tube and the concave portion provided on the second tube are arranged so as to face each other across the fin, and the positions of the convex portion provided on the second tube are a half pitch of the dimple pitch with respect to the longitudinal direction of the tube. They are shifted.

In the heat exchanger according to the present disclosure, the convex portion provided on one flat surface of the first tube and the concave portion provided on the other flat surface of the second tube are arranged at the same position in the longitudinal direction of the tube. The convex portions and the concave portions are alternately arranged every half of the dimple pitch.

Further, the fin of the present disclosure has a bent portion that is continuously bent in a wave shape, and the bent portion is joined to the surface of the tube. Here, when the bent portion joined to the first tube is called a first bent portion and the bent portion joined to the second tube is called a second bent portion, the first bent portion and the second bent portion are half It is repeatedly provided alternately for each pitch.

Therefore, by joining the first bent portion between the convex portions adjacent to each other in the longitudinal direction of the first tube, that is, one of the first tube without the convex portion, the first bent portion is necessarily joined. The second bent portion is joined between the concave portions adjacent to each other in the longitudinal direction of the second tube, that is, the other flat surface of the second tube not provided with the concave portion.

Thereby, even if it is the structure which provided the recessed part in the other eccentric plane of a 2nd tube, the 2nd bending part of a fin is not arrange | positioned in the site | part in which the recessed part is provided. In other words, the second bent portion of the fin can be joined over the entire width of the fin with respect to the major axis direction of the second tube regardless of the number of concave portions provided in the second tube.

In the heat exchanger, for example, the tube is disposed at a position where the convex portion provided on one of the flat surfaces and the concave portion provided on the other flat surface are displaced from each other by a half pitch of the dimple pitch in the longitudinal direction. ing.

According to the above configuration, the first tube and the second tube can have the same shape. That is, by disposing one type of tube alternately with the fins, a convex portion provided on one of the flat surfaces of the first tube and a concave portion provided on the other flat surface of the second tube can be combined with each other. They can be shifted in the longitudinal direction by a half pitch of the dimple pitch.

In the above heat exchanger, for example, the tube has a convex portion provided on one of the flat surfaces and a concave portion provided on the other flat surface arranged at the same position relative to the longitudinal direction. When the length inserted into the header tank is defined as the insertion allowance, the insertion allowance for the first tube in one header tank of the pair of header tanks is more dimple than the insertion allowance for the second tube The insertion amount of the first tube with respect to the other header tank is set smaller by the half pitch of the dimple pitch than the insertion amount of the second tube.

In the above configuration, the first tube and the second tube have the same shape, and the insertion allowance of the first tube and the second tube with respect to the pair of header tanks is shifted by a half pitch of the dimple pitch. The convex portion provided on one flat surface of one tube and the concave portion provided on the other flat surface of the second tube can be arranged so as to be shifted by a half pitch of the dimple pitch in the longitudinal direction of the tube. Thereby, a 1st tube and a 2nd tube can be comprised by one type of tube.

In the heat exchanger, for example, in the tube, the convex portion provided on one of the flat surfaces and the concave portion provided on the other flat surface are disposed at the same position with respect to the longitudinal direction, and The distance from the other end in the longitudinal direction to the nearest convex portion and the concave portion is set to be larger by the half pitch of the dimple pitch than the distance from the one end to the nearest convex portion and the concave portion. The tubes are arranged in a state where one end and the other end of the tubes are inverted in the longitudinal direction.

In the above configuration, the first tube and the second tube have the same shape, and the first tube and the second tube are assembled to the pair of header tanks while being inverted in the longitudinal direction. By assembling one end of the tube and the other end of the second tube, and the other end of the first tube and one end of the second tube in the same direction, respectively, one flat surface of the first tube The convex portion provided and the concave portion provided on the other flat surface of the second tube can be arranged shifted by a half pitch of the dimple pitch in the longitudinal direction of the tube. Thereby, a 1st tube and a 2nd tube can be comprised by one type of tube.

In the heat exchanger, for example, the fins are bent portions that are alternately and continuously bent between the first tube and the second tube, and fin plane portions that are formed between two consecutive bent portions. And a louver is formed on the fin plane portion.

By forming a louver on the fin plane, the heat transfer coefficient between the fluid flowing outside the tube and the fin can be increased, which contributes to improving the performance of the heat exchanger. Moreover, since the heat exchanger of this indication has provided the convex part in the one flat surface of a tube, the flow resistance of the fluid which flows through the non-louver part in which the louver is not formed in the fin surface increases. As a result, the flow rate of the fluid flowing through the non-louver portion is reduced and the flow rate of the fluid flowing through the region where the louver is formed is increased, so that the performance of the heat exchanger is improved.

FIG. 3 is a perspective view illustrating a part of the heat dissipation core according to the first embodiment. 3 is a perspective view of a fin according to Embodiment 1. FIG. It is sectional drawing of the 1st tube and 2nd tube which oppose on both sides of the fin which concerns on Example 1. FIG. 2 is a front view of a heater core according to Embodiment 1. FIG. (A) Sectional drawing of the tube which concerns on Example 2, (b) It is sectional drawing of the 1st tube and 2nd tube which oppose on both sides of a fin. (A) Sectional drawing of the tube which concerns on Example 3, (b) It is sectional drawing of the 1st tube and 2nd tube which oppose on both sides of a fin. (A) Sectional drawing of the tube which concerns on Example 4, (b) It is sectional drawing of the 1st tube and 2nd tube which oppose on both sides of a fin. 10 is a perspective view of a fin according to Embodiment 5. FIG. It is sectional drawing orthogonal to the longitudinal direction of the tube which concerns on a prior art. It is sectional drawing along the longitudinal direction of the tube which concerns on a prior art.

Example 1
In Example 1, an example in which the heat exchanger according to the present disclosure is applied to a heater core for heating mounted in an automobile will be described.

As shown in FIG. 4, the heater core 1 includes a heat exchange core portion (described below) that exchanges heat between engine cooling water that has been cooled by cooling the engine and air that is blown into the vehicle interior, and this heat exchange. And a pair of header tanks 2 disposed at both ends of the core portion.

The heat exchange core section includes a plurality of tubes 3 arranged in parallel at a predetermined interval, fins 4 arranged between adjacent tubes 3 and joined to the surface of the tubes 3, and a heat exchange core It is comprised with the reinforcement plate 5 arrange | positioned at the both sides (upper and lower both sides of FIG. 4) of a part.

As shown in FIG. 1, the tube 3 is formed into a flat tube shape having a cross-sectional shape perpendicular to the longitudinal direction of the tube 3 having a major axis and a minor axis, and forms a cooling channel through which engine cooling water flows.

As shown in FIG. 2, the fin 4 is a corrugated fin that has a constant fin pitch FP and is continuously bent into a wave shape. The fin 4 includes a bent portion 40 that is alternately and continuously bent between adjacent tubes 3, and a flat fin plane portion 41 that is formed between two continuous bent portions 40. And is joined to the flat surface of the tube 3 at the apex of the bent portion 40. Further, the fin plane portion 41 is provided with a louver 42 formed by cutting and raising a part of the fin plane portion 41 into a U-shape.

As shown in FIG. 4, the header tank 2 includes one header tank 2 a into which one end of the tube 3 is inserted, and the other header tank 2 b into which the other end of the tube 3 is inserted. And one header tank 2a and the other header tank 2b communicate with each other through the tube 3. Further, the header tank 2 is provided with a connection port 6 connected to the engine coolant circuit via a hot water pipe (not shown).

In the heater core 1 of the present embodiment, the tube 3, the fin 4, the reinforcing plate 5, and the header tank 2 are all formed using the same type of metal (for example, aluminum having high thermal conductivity), and the heat dissipation core portion. And the header tank 2 are assembled together, and are joined together by brazing in a furnace or soldering, for example.

Next, the configuration of the tube 3 and the arrangement of the fins 4 according to the present disclosure will be described in detail.

As shown in FIG. 1, the tube 3 according to the first embodiment is provided with a convex portion 7 projecting in a hemispherical shape toward the outside of the tube 3 on one of the flat surfaces facing the minor axis direction, and the other flat surface. A recess 8 that is recessed in a hemispherical shape toward the inside of the tube 3 is provided. A plurality of the convex portions 7 and the concave portions 8 are provided with a certain interval in the major axis direction of the tube 3, and are arranged in a plurality of stages at the same pitch as the fin pitch FP in the longitudinal direction of the tube 3. Yes. In addition, the convex part 7 and the recessed part 8 provided in the same tube 3 are arrange | positioned mutually at the same position with respect to the longitudinal direction of the tube 3. Hereinafter, the interval between the convex portions 7 and the concave portions 8 adjacent to each other in the longitudinal direction of the tube 3 is referred to as a dimple pitch DP.

As shown in FIG. 3, when one tube 3 adjacent to the fin 4 is called a first tube 3a and the other tube 3 is called a second tube 3b, the first tube 3a and the second tube 3b are called the second tube 3b. The tube 3b has one flat surface of the first tube 3a (a flat surface on which the convex portion 7 is provided) and the other flat surface of the second tube (a flat surface on which the concave portion 8 is provided). The convex portion 7 provided in the first tube 3a and the concave portion 8 provided in the second tube 3b are arranged so as to face each other with the fin 4 interposed therebetween, and the positions of the convex portion 7 and the concave portion 8 provided in the second tube 3b are half the dimple pitch DP in the longitudinal direction. They are shifted by the pitch.

Here, when the bent part 40 of the fin 4 joined to the first tube 3a is called a first bent part 40a, and the bent part 40 of the fin 4 joined to the second tube 3b is called a second bent part 40b, The first bent portion 40a is joined to the flat surface formed between the convex portions 7 adjacent in the longitudinal direction of the first tube 3a, that is, between the convex portion 7 and the convex portion 7. The portion 40b is joined to a flat surface formed between the concave portions 8 adjacent to each other in the longitudinal direction of the second tube 3b, that is, between the concave portion 8 and the concave portion 8.

(Operation and Effect of Example 1)
In the heater core 1 of the present embodiment, one flat surface of the first tube 3a and the other flat surface of the second tube 3b are arranged to face each other with the fin 4 interposed therebetween, and the first tube 3a. The convex portion 7 provided on one of the flat surfaces of the second tube 3 and the concave portion 8 provided on the other flat surface of the second tube 3 b are arranged so as to be shifted by a half pitch of the dimple pitch DP in the longitudinal direction of the tube 3. .

On the other hand, the fin 4 bent into a wave shape is provided with a bent portion 40 every 1/2 · FP. That is, the 1st bending part 40a joined to the 1st tube 3a and the 2nd bending part 40b joined to the 2nd tube 3b are alternately provided for every 1/2 * FP. In addition, the heater core 1 of a present Example is FP = DP.

Therefore, as shown in FIG. 3, the fins 4 are formed between the convex portions 7 adjacent to each other in the longitudinal direction of the first tube 3 a, that is, on one flat surface of the first tube 3 a where the convex portions 7 are not provided. By joining the first bent portions 40a, it is inevitably between the concave portions 8 adjacent in the longitudinal direction of the second tube 3b, that is, the other of the second tubes 3b in which the concave portions 8 are not provided. The second bent portion 40b of the fin 4 is joined to the uneven plane.

According to said structure, even if it is the structure which provided the recessed part 8 in the other eccentric plane of the 2nd tube 3b, the 2nd bending part 40b of the fin 4 is arrange | positioned in the site | part in which the recessed part 8 is provided. Since the second bent portion 40b can be disposed on the flat surface where the concave portion 8 is not provided, the entire width of the fin 4 is extended with respect to the major axis direction of the second tube 3b regardless of the number of the concave portions 8. Thus, the second bent portion 40b can be joined. Thereby, since the location where the tube 3 and the fin 4 cannot be joined can be eliminated, the fin efficiency can be increased and the performance of the heater core 1 can be improved as compared with the prior art disclosed in Patent Document 1. Can do.

(Example 2)
In the tube 3 shown in the second embodiment, as shown in FIG. 5A, the convex portion 7 provided on one of the flat surfaces and the concave portion 8 provided on the other flat surface are arranged in the longitudinal direction of the tube 3. They are arranged at positions shifted from each other by a half pitch of the dimple pitch DP.

According to said structure, the 1st tube 3a described in Example 1 and the 2nd tube 3b can be made into the same shape. That is, as shown in FIG. 5 (b), the first flat surface of the first tube 3a and the other flat surface of the second tube 3b are arranged opposite to each other with the fin 4 interposed therebetween. The convex portion 7 provided on one of the flat surfaces of the tube 3a and the concave portion 8 provided on the other flat surface of the second tube 3b are shifted by 1/2 · DP in the longitudinal direction of the tube 3. And the same effects as those of the first embodiment can be obtained.

(Example 3)
The third embodiment is an example in which the insertion length inserted into the header tank 2 is changed between the first tube 3a and the second tube 3b.

As shown in FIG. 6A, the tube 3 to be used has a convex portion 7 provided on one of the flat surfaces and a concave portion 8 provided on the other flat surface arranged at the same position with respect to the longitudinal direction. Is done.

Here, when the length at which the end of the tube 3 is inserted into the header tank 2 is defined as the insertion allowance, as shown in FIG. 6B, one header tank of the pair of header tanks 2 is shown. The insertion allowance of the first tube 3a relative to 2a is smaller by 1/2 · DP than the insertion allowance of the second tube 3b, and the insertion allowance of the first tube 3a relative to the other header tank 2b is greater. It is set larger by 1/2 · DP than the insertion allowance of the second tube 3b.

In the above configuration, the protrusion provided on one of the flat surfaces of the first tube 3a by shifting the insertion allowance of the first tube 3a and the second tube 3b to the pair of header tanks 2 by 1/2 · DP. The portion 7 and the concave portion 8 provided on the other flat surface of the second tube 3b can be arranged shifted by 1/2 · DP in the longitudinal direction of the tube 3. Thereby, the effect similar to Example 1 can be acquired using one type of tube 3 common to both, without changing the shape of the 1st tube 3a and the 2nd tube 3b.

(Example 4)
The fourth embodiment is an example in which the first tube 3a and the second tube 3b are disposed so as to be reversed in the longitudinal direction.

1 type of tube 3 which has the same shape is used for the 1st tube 3a and the 2nd tube 3b. In this tube 3, as shown in FIG. 7A, the convex portion 7 provided on one of the flat surfaces and the concave portion 8 provided on the other flat surface are arranged at the same position in the longitudinal direction. And, the distance B from the other end (right end in the figure) to the nearest convex part 7 and the recess 8 from the distance A from one end (the left end in the figure) to the nearest convex part 7 and the recess 8 Is set larger by 1/2 · DP.

The first tube 3a and the second tube 3b are used in a state where one end and the other end of the tube 3 are inverted in the longitudinal direction, as shown in FIG. 7B. That is, by arranging the one end of the first tube 3a and the other end of the second tube 3b and the other end of the first tube 3a and one end of the second tube 3b in the same direction, The convex portion 7 provided on one of the flat surfaces of one tube 3a and the concave portion 8 provided on the other flat surface of the second tube 3b are shifted by 1/2 · DP in the longitudinal direction of the tube 3 can do. Thereby, the effect similar to Example 1 can be acquired using one type of tube 3 common to both, without changing the shape of the 1st tube 3a and the 2nd tube 3b.

(Example 5)
The fin 4 described in the first embodiment has a shape in which the bent portion 40 is curved in an arc shape as shown in FIG. 2, but the fin 4 shown in the fifth embodiment has a bent portion as shown in FIG. 40 is bent with a flat surface left.

According to the fin shape shown in the fifth embodiment, the same effect as that of the first embodiment can be obtained, and a larger joint area with the tube 3 can be secured, so that the heat transfer performance is improved and the tube 3 and the fin are also secured. 4 can be improved.

(Modification)
In Example 1, although the example which applied the heat exchanger of this indication to the heater core 1 for heating was demonstrated, heat exchangers other than the heater core 1, for example, the refrigerant | coolant condenser used for a refrigerating cycle, a refrigerant | coolant evaporator, Used in radiators used in engine cooling systems, oil coolers that cool lubricating oil such as engines and gear boxes, intercoolers that cool air compressed by a turbocharger, and EGR devices that return part of the exhaust air to the intake air It can also be applied to an EGR cooler or the like.

Claims

A plurality of tubes (3) arranged in parallel at predetermined intervals;
A fin (4) disposed between adjacent tubes and joined to the surface of the tube;
A pair of header tanks (2) into which both ends of the tube in the longitudinal direction are inserted;
In a heat exchanger that performs heat exchange between a fluid flowing inside the tube and a fluid flowing outside the tube,
The fins are corrugated fins that have a constant fin pitch (FP) and are bent into a wave shape,
The tube is formed in a flat tube shape in which a cross-sectional shape orthogonal to the longitudinal direction has a major axis and a minor axis, and a convex projecting toward the outside of the tube on one of the flat surfaces opposed to the minor axis direction. A concave portion (8) that is recessed toward the inside of the tube is provided on the other flat surface, and a plurality of the convex portions and the concave portions are arranged at the same pitch as the fin pitch in the longitudinal direction. Arranged in a stage
One of the tubes adjacent to each other with the fin interposed therebetween is called a first tube (3a), and the other tube is called a second tube (3b). The convex portions and the concave portions adjacent to each other in the longitudinal direction of the tubes When the distance between them is called the dimple pitch (DP),
The first tube and the second tube are arranged so that one flat surface of the first tube and the other flat surface of the second tube face each other with the fin interposed therebetween, and The convex portion provided in the first tube and the concave portion provided in the second tube are arranged such that their positions relative to the longitudinal direction of the tube are shifted by a half pitch of the dimple pitch.
The heat exchanger according to claim 1, wherein
In the tube, the convex portion provided on the one flat surface and the concave portion provided on the other flat surface are arranged at positions shifted from each other by a half pitch of the dimple pitch in the longitudinal direction. Heat exchanger.
The heat exchanger according to claim 1, wherein
In the tube, the convex portion provided on the one flat surface and the concave portion provided on the other flat surface are arranged at the same position with respect to the longitudinal direction,
When the length at which the end of the tube is inserted into the header tank is defined as an insertion allowance, the insertion allowance of the first tube with respect to one of the header tanks of the pair of header tanks is greater. The insertion amount of the first tube with respect to the other header tank is smaller than the insertion amount of the second tube than the insertion amount of the second tube. The heat exchanger is set larger by half the pitch.
The heat exchanger according to claim 1, wherein
In the tube, the convex portion provided on the one flat surface and the concave portion provided on the other flat surface are disposed at the same position with respect to the longitudinal direction, and one end in the longitudinal direction. The distance from the other end in the longitudinal direction to the nearest convex portion and the concave portion is set larger than the distance from the nearest convex portion and the concave portion by a half pitch of the dimple pitch,
The first tube and the second tube are arranged in a state where one end and the other end of the first tube and the other tube are reversed in the longitudinal direction.
The heat exchanger according to any one of claims 1 to 4,
The fin includes a bent portion (40) that is alternately and continuously bent between the first tube and the second tube, and a fin plane portion (between the two consecutive bent portions ( 41), and a louver (42) is formed in the fin plane portion.