WO2009104659A1

WO2009104659A1 - Heat exchanger fin and method of manufacturing heat exchanger fin

Info

Publication number: WO2009104659A1
Application number: PCT/JP2009/052831
Authority: WO
Inventors: 健治栩木; 久大貫
Original assignee: カルソニックカンセイ株式会社
Priority date: 2008-02-19
Filing date: 2009-02-19
Publication date: 2009-08-27
Also published as: JP5142753B2; JP2009198033A

Abstract

A heat exchanger fin and a method of manufacturing the heat exchanger fin, in which opposite ends of a corrugated fin are prevented from hanging downward (front-rear direction of a core section) from a core surface during brazing. A radiator (5) has the core section (4) which is formed by alternately stacking undulating fins (2) and tubes (3) one on another between a pair of reinforcement members (1, 1) which are placed at a predetermined interval and brazing the joints between the elements (1, 2, 3). A fin (2) is formed by compression such that the pitch of the undulations in longitudinal opposite end sections (2a) of the fin (2) is less than the pitch of the undulations in an intermediate section of the fin (2). On the downstream side in a fin conveyance direction, that end of a fin (2) which is on the downstream side in the fin conveyance direction is made to contact with a slope surface (15a) of a stopper (15) in synchronism with driving operation of a fin cutting movable blade (13). By this, the pitch at the opposite ends of the fin (2) is made smaller by compression.

Description

Fin for heat exchanger and method of manufacturing fin for heat exchanger

The present invention relates to a heat exchanger fin used in a heat exchanger such as an automobile radiator and a method of manufacturing the heat exchanger fin.

Conventionally, a heat exchanger has a plurality of stacked tubes interposed between each of a plurality of heat exchanger fins, a tube plate connected to a longitudinal end of each tube to form a part of a tank, and both tubes This core part is formed by temporarily assembling a core part composed of a pair of reinforcements that connect and reinforce both ends of the plate, and sandwiching the reinforcements on both sides in the stacking direction of the tube of the core part with a brazing jig. Are integrally brazed and fixed (for example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 08-19858

However, brazing is performed in a state in which each temporarily assembled core part is sandwiched between brazing jigs and a plurality of core parts are stacked with the core surface in the vertical direction. There were problems as described.

In other words, since the fins at both ends in the stacking direction are interposed between a tube and a reinforcement having different thermal expansion coefficients, there is a gap between the three due to the difference in thermal expansion and contraction during brazing. This makes it easy to cause both ends of the fin to hang down from the core surface under its own weight (in the front-rear direction of the core portion).

A problem to be solved by the present invention is to provide a heat exchanger fin and a heat exchanger fin manufacturing method capable of preventing the both ends of the corrugated phone from drooping downward from the core surface when the core portion is brazed. There is to do.

In order to solve the above-mentioned problem, the fin for the heat exchanger of the first invention is formed by alternately laminating a wavy fin and a tube in this order between a pair of reinforcements arranged at a predetermined interval. In a heat exchanger having a core portion where the three joint portions are brazed and fixed, the height of the tops of the corrugated fins at both longitudinal ends is the center in the longitudinal direction when the fin and the tube are not stacked. It is characterized by being formed higher than the height of the top of the corrugated fin in the region.

The fin for the heat exchanger according to the second aspect of the present invention is such that these three parts are joined together in a state in which a wave-like fin and a tube are alternately laminated in a sequence between a pair of reinforcements arranged at a predetermined interval. In a heat exchanger having a core portion fixed by brazing, a wave pitch interval at both ends in the longitudinal direction of the fin is compression-molded narrower than the pitch interval of other waves.

According to a third aspect of the present invention, there is provided a heat exchanger fin manufacturing method in which a corrugated fin that is continuously or intermittently transferred has a predetermined length between a fixed blade and a movable blade having a wedge-shaped cross section. A heat exchanger fin manufacturing method in which the movable blade has a predetermined inclined surface on the downstream side in the transfer direction, and faces the movable blade on the downstream side in the fin transfer direction of the movable blade and the fixed blade. By disposing a stopper portion having an inclined surface and bringing the inclined surface of the stopper portion into contact with the downstream end of the fin in the transfer direction in synchronism with the driving operation of the movable blade, The wave pitch interval at both ends in the longitudinal direction of the fin is compression-molded so as to be narrower than the pitch interval of other waves.

In the heat exchanger fin according to the first aspect of the invention, as described above, the height of the tops of the corrugated fins at both longitudinal ends is the top of the corrugated fins in the longitudinal central region. By forming the core higher in the laminating direction, the side where the top height of the fins at both ends is slightly higher is formed on the tube surface or the tube and reinforcement surface. While the fins are compressed by frictional force on the surfaces of the tubes or the reinforcements of the fins, the height of the tops of the fins is leveled to increase the rigidity, and the contact pressure at both ends of the fins is increased.

This provides an effect that it is possible to prevent the both ends of the fin from drooping downward from the core surface during brazing.

In the heat exchanger fin of the second invention, as described above, the wave pitch interval at both ends in the longitudinal direction of the fin is compression-formed narrower than the pitch interval of other waves, so The height of the top of the fin is slightly higher. And the side where the height of the top of the fins at both ends is a little higher is compression-molded in the laminating direction with respect to the surfaces of both tubes or the surfaces of the tubes and the reinforcement, and the tops of the fins are While the fins are compressed by the frictional force on the surface of the reinforcement, the heights of the tops of the fins are leveled to increase the rigidity, and the contact pressure at both ends of the fins is increased.

In the heat exchanger fin manufacturing method of the third invention, the movable blade has a predetermined inclined surface on the downstream side in the transfer direction, and the inclined surface facing the movable blade is provided on the downstream side in the fin transfer direction of the movable blade and the fixed blade. The stopper has a longitudinal direction of the fin by disposing the stopper portion in synchronism with the driving operation of the movable blade and bringing the inclined surface of the stopper portion into contact with the downstream end portion in the fin transfer direction from the wave height direction of the fin. By compressing and molding the pitch interval of the waves at both ends in the direction smaller than the pitch interval of the other waves, both ends of the fin can be compression molded simultaneously with the cutting of the fin.

Therefore, it is possible to increase the production efficiency of fins that can prevent both end portions of the fins from drooping downward from the core surface during brazing.

It is a side view which shows the fin for heat exchangers of the Example which concerns on this invention. It is a perspective view from the vehicle rear side which shows the radiator in which the fin for heat exchangers of the Example was integrated. It is a rear view of the same radiator. FIG. 3 is an enlarged cross-sectional view of a tank of the radiator and its peripheral portion taken along line S4-S4 of FIG. It is a front view of the core part of the same radiator. It is a principal part expanded sectional view of the core part. It is explanatory drawing which shows the manufacturing method of the fin for heat exchangers of an Example, (a) shows the state before cutting | disconnection in the transfer of a fin, (b) shows the state cut | disconnected while transferring the fin, respectively. It is explanatory drawing which shows the effect | action of the fin for heat exchangers of an Example, (a) is a state before a fin is compressed in the lamination direction of a core part, (b) is a fin compressed in the lamination direction of a core part. Each state is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforce 11 Transfer apparatus 12 Transfer stand 13 Movable blade 13a Inclined surface 14 Fixed blade 15 Stopper member 15a Inclined surface 2 Corrugated fin 2a End of fin 3 Tube 3a End of tube 4 Core 5 Radiator (heat exchanger)
6 Tank 6a Input port 7 Tank 7a Output port 8 Tube plate 8a Claw 9 Tube plate 9a Claw 10 Seal member

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

First, the heat exchanger fin of this embodiment will be described with reference to the following drawings.
FIG. 1 is a side view showing a heat exchanger fin according to an embodiment of the present invention, FIG. 2 is a perspective view of a radiator incorporating the heat exchanger fin according to the embodiment, and FIG. 3 is a rear view of the radiator. 4 is an enlarged cross-sectional view taken along line S4-S4 in FIG. 2, FIG. 5 is a front view of the core portion of the radiator, FIG. 6 is an enlarged cross-sectional view of the main portion of the radiator, and FIG. FIG. 8 is an explanatory view showing the operation of the heat exchanger fin according to the embodiment.

First, the overall configuration of the heat exchanger fin according to the embodiment will be described.
As shown in FIG. 5, the heat exchanger fins are alternately stacked in the order of the wavy fins 2 and the tubes 3 between a pair of

reinforcements

1 and 1 arranged at predetermined intervals in the vertical direction. In such a state, these three joint portions are used in a radiator (heat exchanger) 5 having a core portion 4 to which brazing is fixed.

As shown in FIG. 1, the fin 2 is compression-molded at both ends 2a by compressing and molding the wave pitch interval at the

longitudinal ends

2a and 2a to be narrower than the wave pitch interval at the intermediate portion thereof. While the rigidity of 2a becomes high, it becomes a little higher than the height of the peak of the fin of the intermediate part of the height of the peak of the fin 2 of these both

ends

2a and 2a. In this embodiment, three crests of the compression-molded wave are formed at both

end portions

2a and 2a.

The radiator 5 in which the heat exchanger fins of this embodiment are used includes an aluminum core portion 4 and

resin tanks

6 and 7 disposed on both the left and right sides, as shown in FIG.

Each

tank

6, 7 is formed in a substantially vessel shape, and the tank 6 is provided with an input port 6 a that communicates with the inside thereof and protrudes in a cylindrical shape to the rear, while the tank 7 communicates with the inside thereof, An output port 7a protruding in a cylindrical shape rearward is provided.

As shown in FIG. 5, the core portion 4 is adjacent to a pair of

tube plates

8 and 9 for mounting the

corresponding tanks

6 and 7, and a plurality of tubes 3 stacked between the

tube plates

8 and 9. The corrugated fins 2 are disposed between the tubes 3 and a pair of

reinforcements

1 and 1 that reinforce and connect both end portions of the

tube plates

8 and 9.

As shown in FIGS. 4 to 6, the

tube plates

8 and 9 are formed in a substantially tray shape, and at the bottoms of the

corresponding tanks

6 and 7 by a plurality of

claw portions

8a and 9a protruding from the outer peripheral edge thereof, respectively. It is fixed by caulking through the seal member 10.

The tube 3 is formed in a flat tubular shape, and both end portions 3a thereof are brazed and fixed in a state of being inserted and fixed to the

corresponding tube plates

7 and 8, respectively.

The fins 2 are formed in a wave shape and are brazed and fixed together in a state in which the tops of the waves are in contact with the adjacent tubes 3 or the

reinforcements

1 and 1.
Further, the peak portions of the fins 2 positioned at the outermost end of the core portion 4 are brazed and fixed together in contact with the corresponding

corresponding reinforcements

1 and 1.
Further, although not shown in the figure, a plurality of louvers are provided between the peaks and valleys of the fin 2.

The

reinforcements

1 and 1 are formed in a plate shape having a substantially U-shaped cross section, and their end portions 11 are brazed and fixed together while being inserted into and fixed to the

corresponding tube plates

8 and 9, respectively.

In addition, a clad layer (brazing sheet) is provided on at least one of the joint portions of the constituent members in the core portion 4 of the present embodiment, and the joint portions are joined by brazing, which will be described later.

Next, a method for manufacturing a heat exchanger fin that is compression-molded so that the wave pitch interval at both

longitudinal ends

2a and 2a is narrower than the wave pitch interval at the intermediate portion as described above will be described with reference to FIG. To do.

In this embodiment, as shown in FIG. 7 (a), by a transfer device 11 comprising a right-handed twist worm and a left-handed twist worm that rotate by engaging with both shoulders on the crest side of the corrugated fin 2, respectively. The corrugated fins 2 are continuously transferred on the transfer table 12.

At the position where the fin 2 has moved by the required length, the wedge-shaped movable blade 13 provided on the upper portion of the fin 2 is driven in the vertical direction as shown in FIG. While moving the fin 2 to and from the fixed blade 1, it is cut to a predetermined length.

Although not shown, the worms are configured to transfer the fins 2 by sandwiching the fins 2 from the left and right, connected by gears, and rotated by a servo motor, respectively. The movement distance of the fins 2 can be measured by counting the number of valleys of the corrugated fins 2.
That is, both the worms also serve as cutting and positioning for the counting worms and the valleys of the fins 2.

The movable blade 13 and the fixed blade 14 are provided close to the downstream end of the transfer device 11, and the movable blade 13 is provided with an inclined surface 13a of 10 to 20 ° on the downstream side in the fin transfer direction.

Further, a stopper portion 15 having an inclined surface 15a of 10 to 20 ° facing the movable blade 13 is disposed at a position spaced apart from the movable blade 13 and the fixed blade 14 on the downstream side in the fin transfer direction.

Then, from the state of FIG. 7A, the stopper portion 15 is driven downward in synchronization with the downward driving operation of the movable blade 13, and the inclined surface 15a is transferred to the fin 2 as shown in FIG. 7B. By bringing the fin 2 into contact with the downstream end in the direction from the wave height direction, the wave pitch interval at the longitudinal ends 2a and 2a of the fin 2 is reduced by the descending speed of the movable blade 13 and the stopper 15. Compression molding is performed narrower than the pitch interval of other waves.

The movable blade 13 and the stopper member 15 are driven by appropriate driving means such as an actuator (not shown).

Next, the manufacturing method of the radiator which has the fin of an Example is demonstrated.
When manufacturing the radiator 5, first, as shown in FIG. 5, the components of the core portion 4 are temporarily assembled, and the

reinforcements

1, 1 on both sides in the stacking direction of the tube 3 of each core portion 4 are respectively attached. By sandwiching with a brazing jig and heat-treating in a heating furnace in a state where a plurality of core portions are laminated, the joint portions of the constituent members of the core portion 4 are brazed and fixed to be integrally formed. .

Next, the operation and effect of the radiator having the fins of this embodiment will be described.

In the heat exchanger fin of this embodiment, as described above, the wave pitch interval at the

longitudinal end portions

2a, 2a of the fin 2 is compression-molded so as to be narrower than the wave pitch interval at the intermediate portion thereof. As shown to (a), the height (H2) of the top part of the fin 2 of the both ends 2a and 2a which were compression-molded becomes a little higher than the height (H1) of the top part of the intermediate part. And when the core part 4 is temporarily assembled, the side where the height (H2) of the tops of the fins 2 at both ends is slightly higher is between the surfaces of both

tubes

3 and 3, as shown in FIG. When compression molding is performed between the surfaces of the tube 3 and the reinforcement 1 in the stacking direction of the fins 2 (the height direction of the fins 2), the top of the fins 2 is the fins 2 on the surfaces of both the

tubes

3 and 3 or the reinforcement 1 surface. , The height (H2) of the top of the fin 2 is leveled (H1 = H2), the rigidity at both ends increases, and the contact pressure at both ends of the fin 2 increases.
Therefore, it is possible to prevent the two

end portions

2a and 2a of the fin 2 from hanging down from the core surface during brazing.

Also, at this time, by making the tops of the compression-molded waves three or more, it becomes possible to more reliably prevent the downward sag.

Further, the corrugated plate-like fin 2 continuously transferred on the transfer table 12 by the transfer device 11 is moved to the lower portion of the fin 2 by the vertical drive operation of the wedge-shaped movable blade 12 provided on the upper portion of the fin. In the step of cutting to a predetermined length with the fixed blade 13 provided, the movable blade 13 is provided with an inclined surface 13a on the downstream side in the fin transfer direction, and a predetermined downstream of the movable blade 13 and the fixed blade 14 on the downstream side in the fin transfer direction. A stopper portion 15 having an inclined surface 15a facing the movable blade 13 is disposed at a position apart from the gap, and in synchronization with the driving operation of the movable blade 13, the inclined surface 15a of the stopper portion 15 is downstream of the fin 2 in the transfer direction. By abutting on the side edge from the wave height direction of the fin 2, the wave pitch interval at the

longitudinal ends

2a, 2a of the fin 2 is compression-molded so as to be narrower than the wave pitch interval of the intermediate portion. By the, it is possible to compression molding both end portions 2a, the 2a simultaneously fins 2 and the cutting of the fin 2.

Therefore, it is possible to increase the production efficiency of the fin 2 while preventing the two

end portions

2a, 2a of the fin 2 from drooping downward from the core surface during brazing.

Further, by setting the inclined surfaces of the movable blade 13 and the stopper portion 15 to 10 to 20 °, only the both

end portions

2a and 2a of the fin 2 are simultaneously cut with the fin 2 at the descending speed of the movable blade 13 for cutting the fin 2. Can be compression molded.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

For example, in the embodiment, a radiator is described as an example of a heat exchanger, but the present invention can also be applied to a heat exchanger such as a condenser.

Further, in the embodiment, the height of the top of the wave of the fin is increased by compression molding both ends of the fin, but the height of the top of the wave at the both ends of the fin is previously increased without using compression molding. However, the same effect can be obtained.

In the embodiment, the inclined surfaces of the movable blade 13 and the stopper portion 15 are set to 10 to 20 °. However, when the descending speed of the movable blade 13 is slow, it may be set to 20 ° or more.

Claims

Heat exchange with a core part where these three joint parts are brazed and fixed in a state where wavy fins and tubes are alternately stacked in a sequence between a pair of reinforcements arranged at predetermined intervals. In the vessel
In the state before lamination of the fin and the tube, the height of the top of the corrugated fin at both longitudinal end portions is formed to be higher than the height of the top of the corrugated fin at the middle portion in the longitudinal direction. A heat exchanger fin characterized by the above.
The heat exchanger fin according to claim 1,
3. A fin for a heat exchanger, characterized in that the number of the tops of the wavy fins at both ends in the longitudinal direction formed higher than the height of the tops of the wavy fins in the middle in the longitudinal direction is three or more.
Heat exchange with a core part where these three joint parts are brazed and fixed in a state where wavy fins and tubes are alternately stacked in a sequence between a pair of reinforcements arranged at predetermined intervals. In the vessel
A fin for a heat exchanger, wherein a wave pitch interval at both end portions in the longitudinal direction of the fin is compression-molded to be narrower than a wave pitch interval at an intermediate portion of the fin.
The heat exchanger fin according to claim 3,
3. The heat exchanger fin according to claim 3, wherein there are three or more crests of the compression-molded wave.
A heat exchanger fin manufacturing method in which corrugated fins that are continuously or intermittently transferred are cut to a predetermined length with a fixed blade by a driving operation of a movable blade having a wedge cross section. There,
The movable blade has a predetermined inclined surface on the downstream side in the transfer direction,
A stopper portion having an inclined surface facing the movable blade is disposed downstream of the movable blade and the fixed blade in the fin transfer direction,
In synchronism with the driving operation of the movable blade, the inclined surface of the stopper portion is brought into contact with the downstream end portion of the fin in the transfer direction from the height direction of the wave of the fin, so A method for manufacturing a fin for a heat exchanger, characterized in that the pitch interval is compression-molded narrower than the wave pitch interval of the intermediate portion of the fin.
The method for manufacturing a fin for a heat exchanger according to claim 5, wherein the inclined surfaces of the movable blade and the stopper portion are set to 10 to 20 °.