JP3259510B2 - Finned heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a finned heat exchanger such as a cross fin heat exchanger for an air conditioner.

[0002]

2. Description of the Related Art Conventionally, in a finned heat exchanger such as a cross fin heat exchanger, the frosted state of a fin portion during a heating operation is shown in FIG. 24 and FIG. 5 and heat transfer tube 2 and heat transfer tube 2
During this period, a considerable amount of frost is observed around the outer periphery of the seat 5 of the fin collar 3, while the amount of frost on the downstream rear portion of the seat 5 of the fin collar 3 is small.

[0003] This indicates that the flow of the air flow is stagnant in the same portion, and a dead water area S is generated, which does not contribute much to heat exchange.

[0004] This tendency is particularly remarkable in the case of a waffle fin as shown in which ridges 6A and 6B extending in the longitudinal direction are formed around the heat transfer tube 4 of the fin.

In view of such circumstances, for example, Japanese Unexamined Patent Publication No.
As shown in Japanese Patent Publication No. 268195, in the above-described waffle fin having a plurality of peaks from the upstream side to the downstream side of the air flow, the seat portion of the fin collar is formed in an elliptical shape long in the air flow direction. In addition, by forming a part of the upper and lower or front and rear outer peripheral edge into a chevron structure,
A finned heat exchanger has been proposed in which an air flow is guided behind the fin collar so as to minimize the above-mentioned dead water area.

FIGS. 26 and 27 show the structure of the fin portion of the finned heat exchanger.

In the figure, 1 is a fin, 12 is a heat transfer tube, 13 is a fin collar, A is an air flow, 15 is an elliptical seat whose short axis extends in a stepwise direction and whose long axis extends in the airflow direction. It is. An outer peripheral portion on the short axis side and an outer peripheral portion on the long axis downstream side of the seat 15 are provided along the outer peripheral edge thereof with the seat-side peak portions 17, 1.
8 are formed. In addition, the seat side mountain part 1 in the fin 1
On the outer side of the fins 7 and 18, the fins 16 and the linear fins 16 are provided at substantially the same height as the fins 17 and 18 and the ridge lines extend in the stepwise direction.
A and 16B are formed two each for one row pitch, and the seat-side peaks 17 and 18 are respectively fin-side peaks 16A and 16A.
It is formed between the peaks 16B, 16B and 16A.

According to such a configuration, first, the heat transfer performance is improved by the turbulent flow promoting effect of the fin-side peaks 16A and 16B, and the air flow A is further reduced by the seat-side peaks 17 and 18 to the fin collar 13. It is expected that the heat exchange performance will be improved because the dead water area described above is guided to the rear and the effective heat transfer area is increased.

[0009]

However, the configuration of the above conventional example has the following problems.

(1) The seat itself is a concave portion, and only the outer peripheral portion on the short axis side and the outer peripheral portion on the downstream long axis are ridges, and the concave seat extends to the fin trailing edge side. As in the case of expanding in the direction, a dead water area still occurs behind the fin collar.

(2) Further, the air flow resistance of the air is increased due to the relative unevenness amount of the concave portion and the peak portion, and does not always effectively contribute to the improvement of the heat exchange performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. By improving a seat portion around the fin collar of the fin or a rear fin structure connected to the seat portion, the fin collar can be rearward. It is an object of the present invention to provide a finned heat exchanger that improves the flow of air flow and prevents the occurrence of a dead water area as in the related art.

[0013]

Means for Solving the Problems In order to effectively achieve the above object, the present invention is provided with the following means for solving the problems.

That is, the finned heat exchanger according to the first aspect of the present invention has at least two longitudinally extending ridges 6A and 6B on the upstream side and the downstream side of the air flow A. A fin collar 3 and a seat 5 for closely inserting the heat transfer tube are provided at a valley portion 6C between the fins 6 and 6B. A recess 10 for airflow guide having a reduced diameter in the direction is formed, and the seat 5 is provided in the recess 10 for airflow guide, and a seat surface of the seat 5 is provided downstream thereof. In the finned heat exchanger in which the flat surface 5a extending from the upstream side to the downstream side of the air flow A is formed while gradually decreasing the diameter in the longitudinal direction of the fin in the same state, the concave portion 10 for the air flow guide is formed.
The downstream end of the flat surface 5a is formed so as to converge at the rear edge position of the fin 1.

The finned heat exchanger according to the second aspect of the present invention has at least two longitudinally extending ridges 6A and 6B on the upstream side and the downstream side of the air flow A, respectively. In the finned heat exchanger provided with the fin collar 3 and the seat 5 for closely inserting the heat transfer tube and located in the valley 6C between the fins 6B, the air flow A is downstream from the air flow A upstream from the seat 5 portion. A recess 10 for airflow guide whose diameter in the longitudinal direction of the fin is gradually increased toward the side is formed, and the seat 5 is provided in the recess 10 for airflow guide, and the seat 5 is provided on the downstream side thereof. A flat surface 5a extending from the upstream side to the downstream side of the airflow A while gradually increasing the diameter in the longitudinal direction of the fin is formed in a state flush with the seating surface of the seat 5.

The heat exchanger with fins according to the third aspect of the present invention is the heat exchanger with fins according to the first or second aspect of the present invention, wherein the fins 1 include a fin collar 3, a seat 5, and a flat surface 5a.
Are formed integrally by press working.

According to a fourth aspect of the present invention, there is provided a heat exchanger with fins according to the first, second or third aspect of the present invention.
The fin 1 is made of an aluminum material, and its surface is subjected to a hydrophilic treatment.

On the other hand, the finned heat exchanger according to the fifth aspect of the present invention has at least two longitudinally extending ridges 6A and 6B on the upstream side and the downstream side of the air flow A, and the ridges 6A and 6B. In the heat exchanger with fins provided with the fin collar 3 and the seat 11 for closely inserting the heat transfer tube located in the valley 6C between the seats 6A and 6B, the seat front half 11A of the seat 11 is provided.
It is formed by varying the diameter r ₂ of the diameter r ₁ and the second half portion 11B side of the side.

Further, the finned heat exchanger according to the invention of claim 6 of the present application has the configuration of the invention of claim 5, wherein
The seat 11 has a diameter r ₁ on the front half 11 A side of the rear half 11.
It is formed larger than the diameter r ₂ of the B-side.

Also, in the heat exchanger with fins according to the invention of claim 7 of the present invention, the seat 11 has a diameter r ₂ of the rear half 11B of the front half 11A. It is formed larger than the diameter r _1.

Further, the finned heat exchanger according to the invention of claim 8 of the present application is provided with a fin collar 3 and a seat 51 which are located between the upstream side and the downstream side of the air flow A for closely inserting the heat transfer tube. In the finned heat exchanger, a divided portion 52 is formed at the rear of the seat 51 by vertically dividing the seat 51, and the upper and lower edges 52a and 52b allow the air flow A to be involved.

[0022]

First, the finned heat exchanger according to the first aspect of the present invention has at least two longitudinally extending peaks 6A and 6B on the upstream side and the downstream side of the air flow A as described above. A fin collar 3 and a seat 5 for closely inserting the heat transfer tube are provided at a valley 6C between the hills 6A and 6B,
In addition, a recess 10 for the airflow guide whose diameter in the longitudinal direction of the fin is gradually reduced from the upstream side to the downstream side of the airflow A is formed rearward from the seat 5 portion, and the seat 5 is provided with the recess 10 for the airflow guide. And a flat surface on the downstream side extending from the upstream side to the downstream side of the air flow A while gradually reducing the diameter in the longitudinal direction of the fin while being flush with the seating surface of the seat 5. In the finned heat exchanger in which the air flow guides 5a are formed,
The downstream end of the flat surface 5a is formed so as to converge at the rear edge position of the fin 1.

That is, in this configuration, first, the fin 1 has two ridges 6 whose ridges extend in the vertical direction before and after the seat 5.
A and 6B are formed, and the seat 5 is formed in a valley 6C between the peaks of the ridges 6A and 6B.

From the front to the rear of the seat 5,
A concave portion 10 for the airflow guide is formed in which the diameter in the longitudinal direction of the fin gradually decreases from the upstream side to the downstream side of the airflow A. The seat 5 is located in the recess 10, and a flat surface 5 a that gradually decreases in diameter and extends rearward is formed downstream of the seat 5 in a state flush with the seat surface of the seat 5.

Therefore, according to this configuration, the airflow A in front of the heat transfer tubes 2, 2,... Wraps around the heat transfer tubes 2, 2,. Air flow guide recess 1 that is smoothly introduced into the fins and has a smaller diameter in the fin longitudinal direction toward the downstream side of the peaks 6A and 6B.
While being squeezed at 0, the air flows toward the rear of the fin 1 due to the air resistance, and the heat transfer tubes 2, 2,.
・ The dead water area in the rear is effectively eliminated.

In the case of the structure of the present invention, the air flow guide recess 10 and the downstream end of the flat surface 5a are formed so as to converge particularly at the rear edge position of the fin 1.

Therefore, the narrowing action of the air flow A by the concave portion 10 and the flat surface 5a is more effectively exerted.

As a result, the entire fin 1 can more effectively contribute to heat exchange, and the heat exchange performance is further improved.

The finned heat exchanger according to the second aspect of the present invention has at least two longitudinally extending ridges 6A and 6B on the upstream side and the downstream side of the air flow A, respectively. In the finned heat exchanger provided with the fin collar 3 and the seat 5 for closely inserting the heat transfer tube and located in the valley 6C between the fins 6B, the air flow A is downstream from the air flow A upstream from the seat 5 portion. A recess 10 for airflow guide whose diameter in the longitudinal direction of the fin is gradually increased toward the side is formed, and the seat 5 is provided in the recess 10 for airflow guide, and the seat 5 is provided on the downstream side thereof. A flat surface 5a extending from the upstream side to the downstream side of the airflow A while gradually increasing the diameter in the longitudinal direction of the fin is formed in a state flush with the seating surface of the seat 5.

As described above, if the air flow guide recess 10 and the flat surface 5a are formed so that the diameter in the longitudinal direction of the fin gradually increases from the upstream side to the downstream side of the air flow, the air flow guide Seat 5 with recess 10 for
The air flow from both upper and lower sides of the fin collar 3 is guided so as to wrap around to the rear of the fin collar 3, the effect of introducing the air flow A into the dead water area on the rear side of the fin collar 3 is increased, and The air flow A can be more effectively wrapped around, and the heat transfer performance is improved.

Further, as in the heat exchanger with fins according to the third aspect of the present invention, in the configuration of the first or second aspect, the fins 1 press the fin collar 3, the seat 5, and the flat surface 5a. If it is formed integrally by processing, it can be manufactured and processed easily and at low cost.

Further, as in the finned heat exchanger according to the fourth aspect of the present invention, in the configuration of the first, second or third aspect, the fins 1 are made of an aluminum material, and the surface thereof is subjected to a hydrophilic treatment. In this case, it is lightweight, easy to process, has high heat transfer performance, and hardly causes water splash due to dew condensation.

On the other hand, the heat exchanger with fins according to the fifth aspect of the present invention has at least two fins upstream and downstream of the air flow A.
A heat exchanger with fins having two longitudinally extending ridges 6A, 6B and a fin collar 3 and a seat 11 provided at a valley 6C between the ridges 6A, 6B for closely inserting a heat transfer tube. In the first half 11A of the seat 11
It is configured with different to the diameter r ₁ of the side and the diameter r ₂ of the second half portion 11B side.

As described above, the two ridges 6A, 6 extending at least in the longitudinal direction of the fins on the upstream side and the downstream side of the air flow A.
B, and a fin collar 3 for closely inserting the heat transfer tube is provided at a valley 6C between the peaks 6A and 6B, and a seat 5 is formed around the fin collar 3. The diameter r _{1 of the} front half 11A of the seat 11 of the seat 11
In the case where the diameter r ₂ of the rear part 11B is different from that of the rear part 11B, steps are formed above and below the fin collar 3 by the seats 11 having different diameters r ₁ and r ₂ at the front and rear, and the turbulence promoting action at the step As a result, the flow of the air flow A to the rear of the fin collar 3 becomes good, the dead water area is reduced, and the effective heat transfer area is enlarged.

In such a case, the heat exchanger with fins according to claim 6 of the present invention further includes:
The seat 11, when the direction of the diameter r ₁ of the front half portion 11A side is formed larger than the diameter r ₂ of the second half portion 11B side, the air flow A is suddenly reduced diameter from the upstream side to the downstream side Are effectively disturbed and effectively wrap around the rear side of the heat transfer tubes 2, 2,..., And the dead water area as in the related art is reduced. Therefore, the effective heat transfer area of the fin 1 is increased, and the entire fin 1 can be effectively contributed to heat exchange, and the heat exchange performance is improved.

In the same manner as in the structure of the fifth aspect of the present invention, like the finned heat exchanger of the seventh aspect of the present invention, on the contrary, the diameter r _If the diameter of the airflow A is larger than the diameter r1 of the _first half 11A, the airflow A is effectively disturbed by the step portion whose diameter suddenly increases from the upstream side to the downstream side.・ ・
・ The airflow A is effectively wrapped around the rear of the vehicle. Therefore, the heat exchange performance can be similarly improved.

Further, as another configuration different from those described above,
Like the finned heat exchanger according to the invention of claim 8 of the present application, the finned heat exchange is provided between the upstream side and the downstream side of the air flow A and provided with the fin collar 3 and the seat 51 for closely inserting the heat transfer tube. In the container, a divided portion 52 is formed at the rear of the seat 51 by dividing the seat 51 into upper and lower portions.
If the air flow A can be entrained by the a and 52b, the air flow A wraps around the rear of the fin collar 3 in a favorable manner, and the dead water area is reliably eliminated.

[0038]

As described above, according to the finned heat exchanger of the present invention, the dead water area downstream of the fin collar seat can be effectively reduced, and a finned heat exchanger having high heat exchange performance is provided. It becomes possible.

[0039]

Embodiment 1 Hereinafter, a finned heat exchanger according to Embodiment 1 of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show Embodiment 1 of the present invention.
2 shows a fin portion of the finned heat exchanger in FIG. In the figure, 1 is a fin, 2 is a heat transfer tube, 3 is a fin collar, 3a
Is a heat transfer tube fitting hole, 4 is an air flow, 5 is a circular seat having the same short axis and long axis length. The fin 1 has the seat 5
Ridges 6A and 6B with ridges extending vertically before and after
Is formed, and the seat 5 is formed in a valley 6C between the peaks of the ridges 6A and 6B.

From the front to the rear of the seat 5,
A concave portion 10 is formed in which the diameter in the vertical direction (fin longitudinal direction) gradually decreases from the upstream side to the downstream side of the air flow A. The seat 5 is located in the recess 10, and a flat surface 5 a that gradually decreases in diameter and extends rearward is formed downstream of the seat 5 in a state flush with the seat surface of the seat 5.

Therefore, according to the configuration, the heat transfer tubes 2,
2... A front air flow A is smoothly introduced from above and below the heat transfer tubes 2, 2... To the rear side, and flows behind the fins 1 by air resistance while being narrowed down by the concave portions 10 of the peaks 6 A, 6 B. And heat transfer tubes 2, 2,
・ ・ The dead water area at the rear is effectively eliminated.

As a result, the entire fin 1 can be effectively contributed to the heat exchange, and the heat exchange performance is improved.

(Second Embodiment) In the structure of the first embodiment, the recess 10 for the airflow guide and the downstream end of the flat surface 5a are formed so as to converge at the rear edge position of the fin 1. , The recess 1
For example, as shown in FIGS. 4 to 6 as the second embodiment, the structure of the fin 1 and the flat surface 5a can be opened to the rear edge side of the fin 1 with an equal diameter or slightly larger than the other. Can be realized.

Third Embodiment Next, FIGS. 7 to 9 show a configuration of a finned heat exchanger according to a second embodiment of the present invention.

In the figure, 1 is a fin, 2 is a heat transfer tube, 3 is a fin collar, 3a is a heat transfer tube fitting hole, and A is an air flow, all of which are the same as those in the first embodiment. .

On the other hand, 5A is a seat for fixing the heat transfer tube, and its function is the same as that of the first embodiment. However, in the present embodiment, the seat 11 has a front half 11A as shown in FIG. The diameter r ₁ and r ₂ are different from each other on the side and the rear half 11B side, and the front half 11A is larger than the diameter r ₂ of the rear half 11B.
It is formed by only large diameter r ₁ to a predetermined size [Delta] r (e.g. [Delta] r = 3 mm).

As a result, according to this configuration, a step 11C is formed at the boundary between the front half 11A and the rear half 11B of the seat 11, and the air flow A is effectively disturbed, so that the heat transfer tubes 2, 2,.
・ Efficient sneaking around the rear side of the area, again reducing the dead water area as in the past. Therefore, the effective heat transfer area of the fin 1 is increased, and the entire fin 1 can be effectively contributed to the heat exchange, and the heat exchange performance is improved.

When the heat transfer ratio (B) of the configuration is compared with the case where the entire seat 5 has the same diameter (r ₁ = r ₂ ), for example, the results are as shown in FIG. 13, and the effectiveness of the effect of the configuration is confirmed. Was done.

Fourth Embodiment FIGS. 10 to 12 show a fourth embodiment of the present invention in which the diameter relationship between the front half 11A and the rear half 11B of the seat 11 of the third embodiment is reversed. 2 shows a configuration of a finned heat exchanger.

Even with such a structure, the seat 11
Are disturbed at the step 11D at the boundary between the first half 11A and the second half 11B, and the air flow A effectively wraps around the heat transfer tubes 2, 2,. Therefore, a heat exchange performance improvement effect substantially similar to that of the third embodiment can be realized.

When the heat transfer ratio (A) of the structure is compared with the case where the entire seat 5 has the same diameter (r ₁ = r ₂ ), for example, the result is as shown in FIG. 13, and the effectiveness of the effect of the structure is confirmed. Was done.

In the first to fourth embodiments, the number of the ridges 16A and 16B of the fin 1 is not limited to two as described above, but may be three or more. .

Fifth Embodiment Next, FIGS. 14 to 16 show a configuration of a fin portion of a finned heat exchanger according to a fifth embodiment of the present invention.

In the drawing, reference numeral 1 denotes a fin, 2 denotes a heat transfer tube, 3 denotes a fin collar, 3a denotes a heat transfer tube insertion hole, and A denotes an air flow. Is the same as

On the other hand, reference numeral 51 denotes a seat for fixing the heat transfer tube, and its basic function is the same as that of each of the above embodiments. The rear portion of the seat portion is vertically divided into a Y-shape to form a divided portion 52.

Therefore, the air flow A flowing rearward of the heat transfer tube by the upper and lower edges 52a and 52b of the divided portion 52 is wound inside, as shown by arrows (a) and (b), for example. Such dead water areas are less likely to occur. As a result, the entire fin 1 can be more effectively contributed to the heat exchange, and the heat exchange performance is improved.

The dividing section 52 in this embodiment is
The shape of the fin 1 may be, for example, as shown in FIGS. 17 to 19, and the shape of the fin 1 is not limited to the waffle type as described above, but may be a trapezoidal cross section as shown in FIGS. It may be.

[Brief description of the drawings]

FIG. 1 is a side view of a fin portion of a finned heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the fin section taken along the line 1A-A of FIG.

FIG. 3 is a perspective view of the fin unit.

FIG. 4 is a side view of a fin portion of a finned heat exchanger according to a second embodiment of the present invention.

FIG. 5 is a sectional view of the fin portion taken along line 4B-B of FIG.

FIG. 6 is a perspective view of the fin unit.

FIG. 7 is a side view of a fin portion of a finned heat exchanger according to Embodiment 3 of the present invention.

FIG. 8 is a sectional view of the fin section taken along line 7C-C of FIG.

FIG. 9 is an enlarged view of the fin seat.

FIG. 10 is a side view of a fin portion of a finned heat exchanger according to Embodiment 4 of the present invention.

FIG. 11 is a cross-sectional view of the fin portion taken along line 10D-D of FIG.

FIG. 12 is an enlarged view of the fin seat.

FIG. 13 is a graph showing the relationship between the diameters r ₁ and r ₂ of the front half and the rear half of the seat and the heat transfer ratio in Examples 3 and 4.

FIG. 14 is a side view of a fin portion of a finned heat exchanger according to Embodiment 5 of the present invention.

FIG. 15 is a cross-sectional view of the fin portion taken along line E-E in FIG. 14;
It is a line sectional view.

FIG. 16 is a sectional view of the fin portion taken along line FF of FIG. 14;
It is a line sectional view.

FIG. 17 is a side view of a fin portion of a finned heat exchanger according to Embodiment 6 of the present invention.

FIG. 18 is a sectional view of the fin portion taken along line GG of FIG. 17;
It is a line sectional view.

FIG. 19 is a sectional view of the fin portion taken along line HH in FIG. 17;
It is a line sectional view.

FIG. 20 is a side view of the fin portion of the finned heat exchanger according to the seventh embodiment of the present invention.

FIG. 21 is a sectional view of the fin portion taken along the line II of FIG. 20;
It is a line sectional view.

FIG. 22 is a JJ of the fin portion shown in FIG. 20;
It is a line sectional view.

FIG. 23 is a sectional view of the fin portion taken along line KK of FIG. 20;
It is a line sectional view.

FIG. 24 is a side view of a fin portion of a conventional general finned heat exchanger.

FIG. 25 is a sectional view taken along line LL of FIG. 24;

FIG. 26 is a side view of a fin portion of a conventional finned heat exchanger.

FIG. 27 is a sectional view taken along the line MM of FIG. 26;

[Explanation of symbols]

1 is a fin, 2 is a heat transfer tube, 3 is a fin collar, 5 is a seat,
10 is a concave portion, 11 is a seat, 11A is a seat front half, 11B is a seat rear half, 51 is a seat, 52 is a divided portion, and A is an air flow.

Continued on the front page (72) Inventor Kaori Yoshida 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Co., Ltd.Kanaoka Plant (72) Inventor Hiroyuki Yamashita 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Sakai Manufacturing Kanaoka Plant (56) References Japanese Utility Model Sho 60-2188 (JP, U) Japanese Utility Model Sho 60-12098 (JP, U) Japanese Utility Model Hei 2-62279 (JP, U) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) F28F 1/00-1/32

Claims (8)

(57) [Claims] At least two longitudinally extending peaks (6A) and (6B) on the upstream side and the downstream side of the air flow (A), and a valley between the peaks (6A) and (6B). A fin collar (3) and a seat (5) for closely inserting the heat transfer tube are provided at the portion (6C) , and the air flow (A) is located downstream from the air flow (A) upstream from the seat (5). A concave portion (10) for an airflow guide whose diameter in the longitudinal direction of the fin is gradually reduced toward the side is formed, and the seat (5) is provided and located in the concave portion (10) for the airflow guide. flat surfaces (5a) is formed to extend downstream from the air flow (a) upstream while gradually reducing the diameter of the fin longitudinal direction seat and in a flat condition of said seat (5) on the downstream side In the finned heat exchanger, the airflow
Downstream of the recess (10) and the flat surface (5a) for the guide
The end is formed to converge at the trailing edge of the fin (1)
Heat exchanger with fins, characterized in that it is. 2. The air flow (A) has a small amount upstream and downstream of the air flow (A).
And two ridges (6A) and (6B) extending in the longitudinal direction.
And a valley between the peaks (6A) and (6B)
The fin collar located at (6C) for closely inserting the heat transfer tube
Heat exchange with fins provided with (3) and seat (5)
In the vessel, behind the seat (5), an air flow
(A) From the upstream side to the downstream side, gradually the fin length
A concave portion (10) for an airflow guide having an enlarged diameter in the direction is formed.
The seat (5) is located in the recess (10) for the airflow guide.
Along with the above
In the same state as the seat surface of the seat (5), gradually in the fin longitudinal direction
The air flow (A) extends from upstream to downstream while increasing the diameter of
Characterized in that a flat surface (5a) is formed.
Heat exchanger with fins. 3. The fin (1) includes a fin collar (3),
The seat (5) and the flat surface (5a) are integrated by pressing.
2. The method according to claim 1, wherein the molding is performed by molding.
2. The heat exchanger with fins according to 2. 4. The fin (1) is made of an aluminum material.
Characterized in that the surface of the is subjected to a hydrophilic treatment
Item 4. The finned heat exchanger according to item 1, 2 or 3. 5. An air flow (A) having less upstream and downstream air flows.
And two ridges (6A) and (6B) extending in the longitudinal direction.
And a valley between the peaks (6A) and (6B)
The fin collar located at (6C) for closely inserting the heat transfer tube
Heat exchanger with fins provided with (3) and seat (11)
, The diameter of the seat (11) on the front half (11A) side
(R ₁ ) and the diameter (r ₂ ) of the rear half (11B) are different
A heat exchanger with fins. 6. The seat (11) has a diameter on the front half (11A) side.
(R ₁ ) is larger than the diameter (r ₂ ) on the rear half (11B) side
The fin according to claim 5, wherein the fin is formed.
With heat exchanger. 7. The seat (11) has a diameter on the rear half (11B) side.
(R ₂ ) is larger than the diameter (r ₁ ) of the first half (11A) side
The fin according to claim 5, wherein the fin is formed.
With heat exchanger. 8. A position between the upstream side and the downstream side of the air flow (A).
Fin collar (3) and seat for close insertion of heat transfer tube
In the finned heat exchanger provided with (51),
Behind the seat (51), the seat (51) is divided vertically.
A split portion (52) is formed, and both upper and lower edge portions (52a),
(52b) enables the entrainment of air flow (A)
A heat exchanger with fins.