JPH05231789A - Heat exchanger - Google Patents

Abstract

PURPOSE:To rigidly couple a transfer tube to a tube plate by cutting and erecting elastic pieces for holding ends of the tube at the plate from both sides in a mesh fin type heat exchanger. CONSTITUTION:A pair of elastic pieces 5a, 5b for fixedly holding linear tubelike ends 3a of a transfer tube 3 from both sides and a pair of elastic pieces 5b, 5b for fixedly holding both ends of U-shaped tubular ends 3b are inwardly cut and erected toward a tube plate 2 at the plate 2. The pieces 5a, 5b are bent in a relatively separating direction to apply elastic forces. Holes formed by cutting and erecting the pieces are respectively formed with rectangular openings 6a, 6b so that the ends 3a and 3b are inserted. In this case, the widths of the pieces 5a, 5a, 5b, 5b are respectively set to sizes of the degree capable of holding the ends 3a, 3b. The ends 3a, 3b and the plate 2 can be rigidly fixed by extremely simple means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh fin type heat exchanger in which a large number of mesh fins are joined to the outer circumference of a plurality of heat transfer tubes arranged in parallel with each other in parallel to the tube axis. is there.

[0002]

2. Description of the Related Art As a heat exchanger used for an air conditioner, a cross fin type heat exchanger in which a large number of plate-shaped fins orthogonal to a plurality of heat transfer tubes arranged in parallel are arranged is often used. As is known, in order to improve the heat transfer performance in such a type of heat exchanger, the leading edge effect is improved by applying fin surface processing to form a large number of cut and raised pieces on the fin surface. Is being done.

However, since there is a limit to the improvement of heat transfer performance by the above fin surface processing, in recent years, as an attempt to improve the heat transfer performance on the air side by more positively utilizing the leading edge effect. , The development of a mesh fin type heat exchanger in which a large number of mesh fins are joined to the outer circumference of a plurality of heat transfer tubes arranged in parallel to each other in parallel with the tube axis (for example, 60-10597
No. 2).

[0004]

By the way, in the case of a mesh fin type heat exchanger, it is manufactured in such a sequence that a mesh fin is joined to a heat transfer tube and then a tube plate is attached to an end of the heat transfer tube. Therefore, a clearance can be formed between the heat transfer tube and the mounting hole formed in the tube sheet. Then,
Since the mesh fin type heat exchanger is lightweight, there is a possibility that noise may be generated between the heat transfer tube and the mounting hole due to the flow vibration of the refrigerant. Such noise generation poses a problem when it is used for indoor units, and its elimination is awaited.

In the case of the conventional cross fin type heat exchanger, after the cross fin and the heat transfer tube are inserted into the heat transfer tube, the heat transfer tube is expanded to fix the cross fin and the tube plate to the heat transfer tube at the same time. The method to do is taken,
It is impossible to apply this technique to a mesh fin type heat exchanger because of the structure of the mesh fin type heat exchanger.

The present invention has been made in view of the above points, and an object thereof is to make it possible to firmly fix the end portion of the heat transfer tube and the tube sheet by an extremely simple means.

[0007]

In the invention of claim 1, as a means for solving the above-mentioned problems, as shown in the drawings, a plurality of heat transfer tubes 3, 3, ... , A heat exchanger body 1 composed of a large number of mesh fins 4, 4 ... Joined to the outer circumference of the heat exchanger body 3 on both sides of the heat exchanger body 1, 3 ...
In a heat exchanger constituted by a pair of tube plates 2 and 2 fixed to the ends of the heat transfer tubes, a pair of elastic pieces 5a for sandwiching and fixing the ends of the heat transfer tubes 3 to the tube plates 2 from both sides. , 5a
(Or 5b, 5b) is cut and raised.

According to the invention of claim 2, as a means for solving the above-mentioned problems, as shown in the drawings, in the heat exchanger according to claim 1, the elastic pieces 5a, 5a (or 5b, 5b) are provided. Is cut and raised inward.

According to the invention of claim 3, as a means for solving the above-mentioned problems, as shown in the drawings, in the heat exchanger according to claim 1, each elastic piece 5a, 5a (or 5b, 5b) Is cut and raised toward the outside.

According to a fourth aspect of the invention, as a means for solving the above-mentioned problems, as shown in the drawings, in the heat exchanger according to the first or second aspect, each of the elastic pieces 5b, 5 is formed.
The b is cut and raised so that the pairs are staggered.

In the invention of claim 5, as means for solving the above-mentioned problems, as shown in the drawings, the above-mentioned claim 1,
In the heat exchanger described in 2 or 3, each of the elastic pieces 5 is
A and 5a are cut and raised so that one pair faces each other.

In the invention of claim 6, as a means for solving the above-mentioned problems, as shown in the drawings, a large number of heat transfer tubes 3, 3 are arranged in parallel and the outer circumferences of the heat transfer tubes 3, 3 ,. , And a heat exchanger main body 1 composed of a large number of mesh fins 4, 4, ... Joined in parallel with the tube axis, and end portions of the heat transfer tubes 3, 3 ,. And a pair of tube plates 2 and 2 fixed to the heat transfer tubes 3 and 3.
.. the ends are straight tubular ends 3a, 3a .. and U-shaped tubular ends 3
In the heat exchanger consisting of b, 3b, ..., a pair of elastic pieces 5a, 5a facing each other for sandwiching and fixing both sides of each straight tubular end 3a to each tube sheet 2; A pair of alternating elastic pieces 5b, 5b for sandwiching and fixing both sides of each U-shaped tubular end portion 3b are cut and raised inward.

In the invention of claim 7, as a means for solving the above-mentioned problems, as shown in the drawing, a large number of heat transfer tubes 3, 3 ... Arranged in parallel and the outer circumferences of the heat transfer tubes 3, 3. , And a heat exchanger main body 1 composed of a large number of mesh fins 4, 4, ... Joined in parallel with the tube axis, and end portions of the heat transfer tubes 3, 3 ,. In a heat exchanger constituted by a pair of tube plates 2, 2 fixed to each other, the tube plates 2 and the end portions of the heat transfer tubes 3, 3, ... It is fixed through a bush 7a (or 7b) which is inserted and brought into close contact with the mounting hole 9a (or 9b) formed in the tube sheet 2.

According to the invention of claim 8, as a means for solving the above-mentioned problems, as shown in the drawing, in the heat exchanger according to claim 7, one heat transfer tube 3 is inserted through the bush 7a. It has a circular insertion hole 8a that is closely attached.

According to a ninth aspect of the present invention, as a means for solving the above-mentioned problems, as shown in the drawings, in the heat exchanger according to the seventh aspect, the bush 7b is provided with two heat transfer tubes 3,3. Has an elliptical insertion hole 8b through which is closely inserted.

In the tenth aspect of the invention, as a means for solving the above-mentioned problems, as shown in the drawings, a large number of heat transfer tubes 3, 3 ... Arranged in parallel and the outer circumferences of the heat transfer tubes 3, 3. , And a heat exchanger main body 1 composed of a large number of mesh fins 4, 4, ... Joined in parallel with the tube axis, and end portions of the heat transfer tubes 3, 3 ,. And a pair of tube plates 2 and 2 fixed to the heat transfer tubes 3 and 3.
.. the ends are straight tubular ends 3a, 3a .. and U-shaped tubular ends 3
In the heat exchanger consisting of b, 3b, ..., Circular through holes 8a through which the tube plates 2 and the straight tubular end portions 3a of the heat transfer tubes 3 are inserted and closely attached to one straight tubular end portion 3a. Of the tube plate 2 and the U-shaped tubular end portion 3b of the heat transfer tube 3 are fixed by a bush 7a that is inserted into and closely attached to a mounting hole 9a formed in the tube plate 2. The U-shaped tubular end portion 3b has an oblong insertion hole 8b through which the U-shaped tubular end portion 3b is inserted and closely attached, and is fixed through a bush 7b which is inserted and closely attached to a mounting hole 9b formed in the tube sheet 2.

[0017]

In the invention of claim 1, 2, 3, 4 or 5,
The following actions are obtained by the above means.

That is, a pair of elastic pieces 5a, 5a (or 5b, 5b) cut and raised on the tube sheet 2 are formed on both sides of the end of each heat transfer tube 3.
It will be firmly supported and fixed by.

According to the second aspect of the invention, the following effects can be obtained by the above means.

That is, a pair of elastic pieces 5a, 5a (or 5b,
5b) clamps not only the tube itself at the end of the heat transfer tube 3 but also the end of the mesh fins 4.

According to the third aspect of the invention, the following actions can be obtained by the above means.

That is, a pair of elastic pieces 5a, 5a (or 5b,
5b) sandwiches the tube itself at the end of the heat transfer tube 3.

According to the invention of claim 4, the following effects can be obtained by the above means.

That is, the pair of elastic pieces 5b, 5b cut and raised alternately sandwich the end portions of the two heat transfer tubes 3, 3.

According to the invention of claim 5, the following effects can be obtained by the above means.

That is, the pair of elastic pieces 5a, 5a (or 5b, 5b) cut and raised so as to face each other sandwich the end portion of the heat transfer tube 3.

In the sixth aspect of the invention, the following actions are obtained by the above means.

That is, of the end portions of the heat transfer tubes 3, 3, ..., Both sides of the straight tubular end portion 3a are sandwiched and fixed by a pair of elastic pieces 5a, 5a cut and raised so as to face each other, and the U-shaped tubular end portions are affixed. A pair of elastic pieces 5b, 5b in which both sides of the portion 3b are alternately cut and raised.
By means of this, it is pinched and fixed, and each can be fixed in the optimum state.

According to the invention of claim 7, 8 or 9, the following actions can be obtained by the above means.

That is, the tube plate 2 and the end portions of the heat transfer tubes 3, 3, ... Are firmly coupled via the bushes 7a (or 7b) which are in close contact with both the heat transfer tube 3 side and the tube plate 2 side. Will be done.

According to the invention of claim 8, the following actions can be obtained by the above means.

That is, the end portion of one heat transfer tube 3 and the tube plate 2 are firmly coupled via the bush 7a having the circular insertion hole 8a through which the heat transfer tube 3 side and the tube plate 2 side are closely inserted. Will be done.

According to the ninth aspect of the invention, the following effects can be obtained by the above means.

That is, the ends of the two heat transfer tubes 3, 3 and the tube sheet 2
And the heat transfer tubes 3 and 3 and the tube sheet 2 side are tightly coupled to each other via a bush 7b having an oblong insertion hole 8b.

In the tenth aspect of the invention, the following actions can be obtained by the above means.

That is, among the end portions of the heat transfer tubes 3, 3, ..., The circular through hole 8a is formed so that the straight tubular end portion 3a and the tube sheet 2 are in close contact with both the heat transfer tube 3 side and the tube sheet 2 side. And the U-shaped tubular end portion 3b and the tube plate 2 are connected to each other through the bush 7b having an oval through hole 8b in which both the heat transfer tube 3 side and the tube plate 2 side are in close contact with each other. As a result, the fixing in the optimum state is obtained for each.

[0037]

According to the first, second, third, fourth or fifth aspect of the present invention, a large number of heat transfer tubes 3, 3 ... Arranged in parallel and the outer circumferences of the heat transfer tubes 3, 3 ,. A heat exchanger body 1 composed of a large number of mesh fins 4, 4, ... Joined in parallel with the tube axis, and heat transfer tubes 3 on both sides of the heat exchanger body 1.
In a heat exchanger composed of a pair of tube plates 2 and 2 fixed to the ends of the heat transfer tubes 3, a pair of tube plates 2 are provided to sandwich and fix the end parts of the heat transfer tubes 3 from both sides. Elastic piece 5
Cut and raise a, 5a (or 5b, 5b) so that both ends of each heat transfer tube 3 can be firmly supported and fixed by the elastic clamping force of the pair of elastic pieces 5a, 5a (or 5b, 5b). As a result, the connection between the tube plate 2 and the ends of the heat transfer tubes 3, 3 ... Is strengthened, and noise is prevented from occurring due to vibration during refrigerant circulation, even with a lightweight mesh fin type heat exchanger. It has an excellent effect that it can be done.

According to the invention of claim 2, in the heat exchanger according to claim 1, each elastic piece 5a, 5a (or 5b, 5b).
Cut and raised inward to form a pair of elastic pieces 5a, 5
The elastic clamping force of a (or 5b, 5b) can clamp not only the tube itself at the end of the heat transfer tube 3 but also the end of the mesh fins 4, so that the heat transfer tube 3 is not damaged. Since 2 can be firmly fixed, there is an excellent effect that the noise prevention effect is further improved.

According to the invention of claim 3, in the heat exchanger according to claim 1, each elastic piece 5a, 5a (or 5b, 5b).
To the outside and cut and raised it to form a pair of elastic pieces 5a, 5
Since the tube itself at the end of the heat transfer tube 3 can be firmly supported and fixed by the elastic clamping force of a (or 5b, 5b), the cutting and raising direction of the elastic pieces 5a, 5a is not limited. There is an excellent effect that the degree of freedom in manufacturing the heat exchanger is improved.

According to a fourth aspect of the present invention, in the heat exchanger according to the first or second aspect, the elastic pieces 5b, 5b are cut and raised so that a pair of them are staggered so that the two heat transfer tubes 3, Since the end of No. 3 can be sandwiched by the pair of elastic pieces 5b, 5b, the number of elastic pieces 5b, 5b can be reduced as much as possible, which is an excellent effect that the number of processing steps of the tube sheet 2 can be reduced. There is.

According to the invention of claim 5, in the heat exchanger according to claim 1 or 3, each elastic piece 5a, 5a (or 5b, 5b) is cut and raised so that one pair faces each other,
Connect the end of the heat transfer tube 3 to the pair of elastic pieces 5a, 5a (or 5b, 5).
Since it can be sandwiched by b), there is an excellent effect that the sandwiching and fixing force of the heat transfer tube 3 is improved.

According to the invention of claim 6, a large number of heat transfer tubes 3, 3 ... Arranged in parallel and a large number of joints connected to the outer circumferences of the heat transfer tubes 3, 3. And a pair of tube plates 2 and 2 fixed to the end portions of the heat transfer tubes 3 and 3 on both sides of the heat exchanger body 1 The heat transfer tubes 3, 3
.. the ends are straight tubular ends 3a, 3a .. and U-shaped tubular ends 3
In the heat exchanger consisting of b, 3b, ..., a pair of elastic pieces 5a, 5a facing each other for sandwiching and fixing both sides of each straight tubular end 3a to each tube sheet 2; A pair of staggered elastic pieces 5b, 5b for sandwiching and fixing both sides of each U-shaped tubular end portion 3b are cut and raised, and the heat transfer tube 3,
Of the end portions of 3 ..., Both sides of each straight tubular end portion 3a are sandwiched and fixed by a pair of elastic pieces 5a, 5a that are cut and raised facing each other, and both sides of each U-shaped tubular end portion 3b are staggered. Since the pair of cut-and-raised elastic pieces 5b, 5b are sandwiched and fixed, the optimum fixing can be obtained, and the tube sheet 2 and the end portions of the heat transfer tubes 3, 3 ,. Can be achieved by a simple means and has a great effect of preventing noise generation.

According to the invention of claim 7, 8 or 9,
A large number of heat transfer tubes 3, 3 ... Arranged in parallel and the heat transfer tubes 3, 3
.. and a heat exchanger main body 1 composed of a large number of mesh fins 4, 4 ...
In a heat exchanger constituted by a pair of tube plates 2, 2 fixed to the ends of the heat transfer tubes 3, 3, ... On both sides of the heat exchanger body 1, each tube plate 2 and the heat transfer tubes 3, 3 .. and bushes 7a (or 7b) that are inserted and closely attached to the ends of the heat transfer tubes 3 and that are also inserted and closely attached to the mounting holes 9a (or 9b) formed in the tube sheet 2 The bush 7a is fixed so that the tube plate 2 and the end portions of the heat transfer tubes 3, 3, ... Are brought into close contact with both the heat transfer tube 3 side and the tube plate 2 side.
(Or 7b) so that they are firmly connected to each other, the connection between the tube sheet 2 and the end portions of the heat transfer tubes 3, 3 ,. Also, there is an excellent effect that it is possible to prevent generation of noise due to vibration or the like when the refrigerant flows.

According to the eighth aspect of the present invention, in the heat exchanger according to the seventh aspect, the bush 7a is provided with a circular insertion hole 8a through which one heat transfer tube 3 is inserted and closely attached. Since the end portion and the tube plate 2 can be firmly coupled to each other via the bush 7a which is closely inserted to both the heat transfer tube 3 side and the tube plate 2 side, the tube plate 2 and the heat transfer tube 3 can be easily connected by a simple means. , 3, ... has an excellent effect that a strong bond with the end portion can be obtained.

According to the ninth aspect of the invention, in the heat exchanger according to the seventh aspect, the bush 7b is provided with two heat transfer tubes 3,3.
Since it has the oblong insertion hole 8b that is inserted and closely attached, the number of bushes can be reduced as much as possible, and there is an excellent effect that the productivity of the heat exchanger is improved.

According to the tenth aspect of the invention, a large number of heat transfer tubes 3, 3 ... Arranged in parallel and a large number of the outer circumferences of the heat transfer tubes 3, 3. And a pair of tube plates 2 and 2 fixed to the end portions of the heat transfer tubes 3 and 3 on both sides of the heat exchanger body 1 The heat transfer tubes 3, 3
.. the ends are straight tubular ends 3a, 3a .. and U-shaped tubular ends 3
In the heat exchanger consisting of b, 3b, ..., Circular through holes 8a through which the tube plates 2 and the straight tubular end portions 3a of the heat transfer tubes 3 are inserted and closely attached to one straight tubular end portion 3a. Of the tube plate 2 and the U-shaped tubular end portion 3b of the heat transfer tube 3 are fixed by a bush 7a that is inserted into and closely attached to a mounting hole 9a formed in the tube plate 2. Since the U-shaped tubular end portion 3b has an oval insertion hole 8b through which the U-shaped tubular end portion 3b is inserted and adheres and is fixed through a bush 7b which is inserted and adhered to a mounting hole 9b formed in the tube sheet 2, it is optimal for each. Since it can be fixed in a state, the tube plate 2 and the end portions of the heat transfer tubes 3, 3, ... Can be connected by a simple means, and there is an excellent effect that the noise generation prevention effect is large.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 to 3 show a heat exchanger according to Embodiment 1 of the present invention. The present embodiment corresponds to the inventions of claims 1, 2 and 5.

In the heat exchanger of this embodiment, a large number of heat transfer pipes 3, 3 ... Arranged in parallel and a large number (() connected to the outer circumferences of the heat transfer pipes 3, 3. In the case of this embodiment,
(6 sheets) mesh fins 4, 4, ... And heat exchanger main body 1, and heat transfer tubes 3, 3 ,.
-It is constituted by the tube plate 2 fixed to the end. In addition, in this heat exchanger, the heat transfer tubes 3, 3, ...
Heat is to be exchanged between the refrigerant flowing inside and the airflow flowing in the direction orthogonal to the mesh fins 4, 4.

In the case of the present embodiment, since the refrigerant flow in the heat exchanger is performed in two passes, the ends of the heat transfer tubes 3, 3, ... Are straight tubular ends 3a, 3a. And U-shaped tubular ends 3b, 3b ...

Therefore, the tube sheet 2 has a pair of opposing elastic pieces 5a, 5a for sandwiching and fixing both sides of each straight tubular end 3a, and both sides of each U-shaped tubular end 3b. A pair of elastic pieces 5b, 5b opposed to each other for sandwiching and fixing is cut and raised inward. These elastic pieces 5a, 5b
Is formed by cutting and raising a part of the tube sheet 2 into a rectangular shape and bending each of them in a direction in which they are separated from each other so as to give an elastic force. In the cut and raised mark, the straight tubular end portion 3a is formed. Further, rectangular openings 6a and 6b into which the U-shaped tubular end portion 3b is inserted are formed, respectively. The width of the elastic pieces 5a, 5a is small enough to hold the straight tubular end 3a, and the width of the elastic pieces 5b, 5b is large enough to hold the U-shaped tubular end 3b. It has a large size.

The elastic pieces 5a, 5a and 5b, 5b are shown in FIG.
As shown in FIG. 3, the straight tube end 3a and the U-shaped tube end 3b of the heat transfer tube 3 are clamped and fixed by elastic force from above the end of the mesh fin 4.

With the above construction, the heat exchanger of this embodiment has the following effects.

Straight tube end portions 3a of the heat transfer tubes 3, 3 ...
.. and U-shaped tubular end portions 3b, 3b .. .. are firmly supported and fixed by the elastic clamping force of the pair of elastic pieces 5a, 5a and 5b, 5b, and the tube sheet 2 and the heat transfer tube 3 , 3
.. The connection with the end portions of .. is strengthened, and even a lightweight mesh fin type heat exchanger can prevent noise generation due to vibration during refrigerant circulation.

Further, each elastic piece 5a, 5a and 5b, 5b is
Since it is cut and raised inward, the elastic clamping force of the pair of elastic pieces 5a, 5a and 5b, 5b clamps not only the tube itself at the end of the heat transfer tube 3 but also the end of the mesh fin 4. As a result, the tube sheet 2 can be firmly fixed without damaging the heat transfer tube 3.

Furthermore, one straight tubular end 3a or 1
A pair of elastic pieces 5a, 5a facing each other with one U-shaped tubular end 3b
Alternatively, since it can be sandwiched by 5a, 5a, the sandwiching and fixing force of the heat transfer tube 3 is improved.

Embodiment 2 FIGS. 4 and 5 show a heat exchanger according to Embodiment 2 of the present invention. The present embodiment corresponds to the inventions of claims 1, 2 and 6.

In the case of the present embodiment, the elastic pieces 5b, 5b for holding the U-shaped tubular end portion 3b of the heat transfer tube 3 are half-width and alternately cut and raised.
Therefore, the elastic pieces 5b, 5b are pressed against the base end portions of the U-shaped tubular end portions 3b, respectively. The other configurations are similar to those of the first embodiment, and thus the description thereof is omitted.

With the above-described structure, a pair of ends of the heat transfer tubes 3, 3 ... Are cut and raised on both sides of the straight tubular end 3a so as to face each other as in the first embodiment. Elastic piece 5
It is clamped and fixed by a and 5a (see Fig. 2), and the U-shaped tubular end 3b.
As shown in FIG. 5, both sides of the sheet are sandwiched and fixed by a pair of elastic pieces 5b, 5b that are cut and raised in an alternating manner. The connection with the ends of the heat transfer tubes 3, 3, ... Can be achieved by a simple means. The other functions and effects are the same as those in the first embodiment, and the description thereof will be omitted.

Embodiment 3 FIGS. 6 and 7 show a heat exchanger according to Embodiment 3 of the present invention. The present embodiment corresponds to the inventions of claims 1 to 3.

In the case of this embodiment, the circulation of the refrigerant in the heat exchanger is carried out in four passes, and the end portions of the heat transfer tubes 3, 3, ... Are located on one side of the heat exchanger body 1. .. and U-shaped tubular ends 3b, 3b ..

On one tube sheet 2, a pair of elastic pieces 5b, 5b which are alternately cut and raised in order to sandwich the two straight tubular ends 3a, 3a are provided, and the other tube sheet 2 is provided. Board 2
Is provided with elastic pieces 5b, 5b which are alternately staggered inward to sandwich the U-shaped tubular end 3b. The other configurations are similar to those of the first embodiment, and thus the description thereof is omitted.

With the above structure, the elastic pieces 5b, 5b
.. can be reduced in number, and the number of processing steps for the tube sheet 2 can be reduced. The other functions and effects are the same as those in the first embodiment, and the description thereof will be omitted.

Embodiment 4 FIGS. 8 to 10 show a heat exchanger according to Embodiment 4 of the present invention. The present embodiment corresponds to the inventions of claims 1, 3 and 5.

In the case of this embodiment, the elastic pieces 5a and 5b are cut and raised outward. The other configuration is similar to that of the first embodiment, and thus the description is omitted.

With the above construction, the tube itself at the end of the heat transfer tube 3 is firmly supported and fixed by the elastic clamping force of the elastic pieces 5a and 5b, and the straight tubular end 3a is clamped. The direction in which the elastic pieces 5a, 5a are cut and raised is not limited. Therefore, the degree of freedom in manufacturing the heat exchanger is improved.

Embodiment 5 FIGS. 11 to 13 show a heat exchanger according to Embodiment 5 of the present invention. The present embodiment corresponds to the inventions of claims 7 and 10.

In the case of this embodiment, the straight tubular end portion 3a of the heat transfer tubes 3, 3 ... In the heat exchanger body 1 and the tube sheet 2 are
One straight tubular end portion 3a has a circular insertion hole 8a into which it is inserted and closely attached, and is fixed through a bush 7a which is inserted and intimately attached to an attachment hole 9a formed in the tube sheet 2, and each of the above The tube plate 2 and the U-shaped tubular end portion 3b of the heat transfer tube 3 have an oval through hole 8b through which the U-shaped tubular end portion 3a is inserted and closely contacted, and the mounting hole 9b formed in the tube sheet 2 is It is fixed via a bush 7b which is inserted and closely attached.

In the present embodiment, the bushes 7a and 7b are made of thermoplastic resin, and the straight tubular end portion 3a or the U-shaped tubular end portion 3b is inserted into the circular insertion hole 8a or the oval insertion hole 8b. After that, the bush 7a or 7b is inserted into the mounting hole 9a or 9b of the tube sheet 2, and the bush 7a or 7b is softened by the heat during the brazing work performed thereafter, and the bush 7a or 7b and the straight tubular end portion 3a or The U-shaped tubular end portion 3b and the tube sheet 2 are brought into close contact with each other and then fixed by cooling.

Although the bushes 7a and 7b are made of thermoplastic resin in this embodiment, they may be made of soft metal or rubber instead.

With the above-described structure, the straight tubular ends 3a, 3a ... Of the ends of the heat transfer tubes 3, 3, ... And the tube sheet 2 are connected via the bush 7a, and a U-shaped portion is formed. Tubular end 3
.. and the tube sheet 2 are connected via the bush 7b, and the fixing in the optimum state can be obtained for each. Therefore, the connection between the tube sheet 2 and the end portions of the heat transfer tubes 3, 3, ... Can be achieved by a simple means, and the generation of noise due to the vibration during the circulation of the refrigerant can be effectively prevented.

In the case of this embodiment, the bushes 7a, 7b are
The outer shape and the mounting holes 9a and 9b are circular and oval, but these shapes are free.

Embodiment 6 FIGS. 14 and 15 show a heat exchanger according to Embodiment 6 of the present invention. The present embodiment corresponds to the inventions of claims 7 and 9.

In the case of this embodiment, the circulation of the refrigerant in the heat exchanger is carried out in four passes, and the end portions of the heat transfer tubes 3, 3, ... Are located on one side of the heat exchanger body 1. .. and U-shaped tubular ends 3b, 3b ..

The straight tubular ends 3a, 3a ...
Each of the two U-shaped tubular end portions 3b is inserted into and closely attached to a bush 7b having an oval insertion hole 9b (see FIG. 15).
Is inserted into and closely attached to the bush 7b as in the fifth embodiment. The other structure is similar to that of the fifth embodiment, and thus the description thereof is omitted.

With the above structure, the two straight tubular end portions 3a, 3a and the tube sheet 2 are inserted into the heat transfer tubes 3, 3 side and the tube sheet 2 side in an oblong insertion hole 9b. Since it can be firmly coupled through the bushes 7b having the, the number of bushes can be reduced as much as possible. Therefore, the productivity of the heat exchanger is improved. Other functions and effects are the same as those of the fifth embodiment, and therefore the description thereof is omitted.

Embodiment 7 FIG. 16 shows a heat exchanger according to Embodiment 7 of the present invention. The present embodiment corresponds to the inventions of claims 7 and 8.

In the case of this embodiment, the circulation of the refrigerant in the heat exchanger is carried out in 8 passes, and all the end portions of the heat transfer tubes 3, 3 ... Are straight tubular ends 3a, 3a. It is said that.

The end of each heat transfer tube 3 (that is, the straight tubular end 3a) and the tube plate 2 are connected to each other via a bush 7a having a circular insertion hole 9a. The other structure is similar to that of the fifth embodiment, and thus the description thereof is omitted.

With the above-described structure, the bush in which the end portion of the heat transfer tube 3 (that is, the straight tubular end portion 3a) and the tube plate 2 are inserted in close contact with both the heat transfer tube 3 side and the tube plate 2 side. 7
Since it can be firmly connected through a, the tube plate 2 and the heat transfer tubes 3, 3, ... Can be firmly connected by a simple means. Other functions and effects are the same as those of the fifth embodiment, and therefore the description thereof is omitted.

The invention of the present application is not limited to the configuration of each of the above-described embodiments, and it goes without saying that the design can be appropriately changed without departing from the gist of the invention.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a connecting portion between a straight tubular end portion and a tube sheet in the heat exchanger according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a joint portion between a U-shaped tubular end portion and a tube plate in the heat exchanger according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a heat exchanger according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a joint portion between a U-shaped tubular end portion and a tube plate in the heat exchanger according to the second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a heat exchanger according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a connecting portion between a straight tubular end portion and a tube plate in a heat exchanger according to a third embodiment of the present invention.

FIG. 8 is an exploded perspective view of a heat exchanger according to a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a joint portion between a straight tubular end portion and a tube plate in a heat exchanger according to Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view showing a joint between a U-shaped tubular end portion and a tube plate in a heat exchanger according to Embodiment 4 of the present invention.

FIG. 11 is an exploded perspective view of a heat exchanger according to a fifth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a connecting portion between a straight tubular end portion and a tube plate in a heat exchanger according to Embodiment 5 of the present invention.

FIG. 13 is a cross-sectional view showing a joint portion between a U-shaped tubular end portion and a tube plate in a heat exchanger according to Example 5 of the present invention.

FIG. 14 is an exploded perspective view of a heat exchanger according to a sixth embodiment of the present invention.

FIG. 15 is a cross-sectional view showing a joint between two straight tubular ends and a tube plate in the heat exchanger according to Example 6 of the present invention.

FIG. 16 is an exploded perspective view of a heat exchanger according to Embodiment 6 of the present invention.

[Explanation of symbols]

1 is a heat exchanger main body, 2 is a tube plate, 3 is a heat transfer tube, 3a is a straight tubular end, 3b is a U-shaped tubular end, 4 is a mesh fin, 5a,
5b is an elastic piece, 7a and 7b are bushes, 8a is a circular insertion hole,
8b is an oval insertion hole, and 9a and 9b are mounting holes.

Claims (10)

[Claims] 1. A plurality of heat transfer tubes (3), (3) arranged in parallel.
.. and a large number of mesh fins (4), (4), which are joined to the outer circumference of the heat transfer tubes (3), (3) ..
And a pair of tube plates (2), (2) fixed to the ends of the heat transfer tubes (3), (3), ... On both sides of the heat exchanger body (1). And a pair of elastic pieces (5a, 5a or 5) for clamping and fixing the end portions of the heat transfer tubes (3) from both sides to the tube plates (2).
A heat exchanger characterized by cutting and raising b, 5b). 2. The elastic pieces (5a, 5a or 5b, 5b)
The heat exchanger according to claim 1, wherein the heat exchanger is cut and raised toward the inside. 3. The elastic pieces (5a, 5a or 5b, 5b)
The heat exchanger according to claim 1, wherein the heat exchanger is cut and raised toward the outside. 4. The heat exchanger according to claim 1, wherein the elastic pieces (5b, 5b) are cut and raised so that a pair of them are staggered. 5. The elastic pieces (5a, 5a or 5b, 5b)
4. The heat exchanger according to claim 1, 2 or 3, wherein the heat exchangers are cut and raised so that one pair face each other. 6. A plurality of heat transfer tubes (3), (3) arranged in parallel.
.. and a large number of mesh fins (4), (4), which are joined to the outer circumference of the heat transfer tubes (3), (3) ..
And a pair of tube plates (2), (2) fixed to the ends of the heat transfer tubes (3), (3), ... On both sides of the heat exchanger body (1). ) And the heat transfer tube
The ends of (3), (3) ... are straight tubular ends (3a), (3a) ... and U
A heat exchanger comprising tubular end portions (3b), (3b) ... And each tube plate (2) having a straight tubular end portion (3).
a) A pair of elastic pieces facing each other for sandwiching and fixing both sides.
(5a), (5a) and a pair of elastic pieces (5b) staggered for sandwiching and fixing both sides of each U-shaped tubular end (3b),
(5b) A heat exchanger characterized by being cut and raised inward. 7. A plurality of heat transfer tubes (3), (3) arranged in parallel.
.. and a large number of mesh fins (4), (4), which are joined to the outer circumference of the heat transfer tubes (3), (3) ..
And a pair of tube plates (2), (2) fixed to the ends of the heat transfer tubes (3), (3), ... On both sides of the heat exchanger body (1). ) And the tube sheet (2) and the end portions of the heat transfer tubes (3), (3) ... With respect to the end portions of the heat transfer tubes (3). Inserted and closely attached and tube plate
A heat exchanger characterized by being fixed via a bush (7a or 7b) which is inserted into and closely attached to a mounting hole (9a or 9b) formed in (2). 8. A heat transfer tube provided with the bush (7a).
The heat exchanger according to claim 7, wherein (3) has a circular insertion hole (8a) which is inserted and closely attached. 9. The bush (7b) is provided with two heat transfer tubes.
The heat exchanger according to claim 7, wherein the heat exchanger (3) has an oval through hole (8b) through which the (3) is inserted and closely attached. 10. A plurality of heat transfer tubes (3) arranged in parallel,
(3) ··· and a large number of mesh fins (4), (4) joined to the outer circumferences of the heat transfer tubes (3), (3) · · in parallel with the tube axis
..Heat exchanger body (1) consisting of and said heat exchanger body
(1) The heat transfer tubes (3), (3) on both sides are constituted by a pair of tube plates (2), (2) fixed to the ends of the heat transfer tubes (3), (3).・ Ends of straight tube ends (3a), (3a) ・ ・
And a U-shaped tubular end portion (3b), (3b) ... And a heat exchanger comprising: A bush (7a) having a circular insertion hole (8a) through which one straight tubular end portion (3a) is inserted and closely attached and which is inserted and closely attached to an attachment hole (9a) formed in the tube sheet (2). ), And each tube sheet (2) and the U-shaped tubular end portion (3b) of the heat transfer tube (3) are inserted into the U-shaped tubular end portion (3b) to be in close contact therewith. A heat exchanger characterized in that it has a hole (8b) and is fixed through a bush (7b) that is inserted and closely fitted in a mounting hole (9b) formed in the tube sheet (2).