JP2002071293A - Connection structure for heat exchanger pipe and tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that if pressure of a medium flowing in a pipe becomes higher in the future than in the past, a brazed part having a pressure resistance capable of sufficiently withstanding conventional pressures will not be able to withstand the higher pressure and a crack can be caused in a site low in strength of brazing and a clearance can be formed to cause a leakage of a refrigerant. SOLUTION: An insertion part of a tube inserted in a tube insertion hole of a heat exchanger pipe is fixed in close contact with an inner face of the pipe. Two pipe members are combined to form the heat exchanger pipe and the insertion part of the tube inserted in the tube insertion hole is fixed in close contact with the inner face of the heat exchanger pipe, and both of the pipe members are fixed in closed contact. An insertion restricting part for restricting an insertion length of the heat exchanger pipe into the tube insertion hole of the heat exchanger pipe is formed on a side face of the tube. Brazing is employed for fixing both of the combined pipe members in close contact and for fixing the heat exchanger pipe and the insertion part of the tube in close contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger pipe suitable for use in a heat exchanger such as a radiator, a heater core, a condenser (refrigerant condenser), an evaporator and the like, particularly a condenser using a high-pressure medium. The present invention relates to a tube connecting structure.

[0002]

2. Description of the Related Art One of the heat exchangers is a parallel flow type heat exchanger. As shown in FIG. 23, the refrigerant flowing in the flat tubular tube C provided between the two pipes A and B is subjected to pressure (normally a high pressure of several tens of kilograms) to forcibly radiate heat, thereby forcing the refrigerant. Is converted into a low-temperature and high-pressure cooling liquid, and the heat generated at this time is transmitted from the tube C to the corrugated fin D, and the heat is radiated by the wind sent to the corrugated fin D.

The two pipes A and B in FIG. 24 have the same structure, and are internally partitioned by partition plates E ₁ , E ₂ and E ₃ as shown in FIGS. In the heat exchanger the refrigerant fed from the upper end of the left pipe A in FIG. 24 is supplied to the tube C in several above the partition plate E ₁ of the upper in the pipe A, the right side from the tubes C fed to the pipe B, the refrigerant fed into the same pipe B is sent sent to tube C above the left side of the pipe a than the partition plate E ₂ in and the pipe B at a lower than tube C, the the refrigerant is fed to the tube C above the partition plate E ₃ in and the pipe a at a lower than tube C. Similarly, from the right pipe B to the left pipe A,
It flows meandering from the left pipe A to the right pipe B. In this case, the refrigerant is a gas (gas) on the upstream (upper stage), but liquefies as it flows downstream (lower stage) and becomes difficult to flow. Therefore, usually, the number of tubes C partitioned by the partition plates E ₁ , E ₂ , and E ₃ is reduced as the lower stage, so that the liquefied refrigerant easily flows into the lower tube C.

[0004] The pipes A and B may be round pipes or the like in FIG.
A pipe formed by combining two pipe members F and G as in the above, a pipe made by rolling a single plate with a hole, or a pipe that has been formed in advance into a single pipe (For example, a seamless pipe). The tube C is inserted into a number of tube insertion holes H (FIG. 25) opened in the pipes A and B. The partitions E ₁ , E ₂ , E
Numeral ₃ is inserted into partition plate insertion holes J (FIG. 25) opened at several places of the pipes A and B to partition the pipes A and B in the axial direction. These tubes C, partition plates E ₁ , E ₂ , E ₃
(See FIG. 26) is brazed to the pipes A and B and fixedly adhered thereto. At one end in the longitudinal direction of the pipes A and B, as shown in FIG.
Is attached, and a joint L is attached and brazed to the other end.

[0005]

The conventional heat exchanger pipe has the following problems. 1. Since the medium flowing in the pipes A and B has a high pressure of several tens of kilograms, if there is a weak point in the brazing strength, a crack or a gap is formed in the weak point during use, and the refrigerant leaks therefrom. There is a fear. 2. In the future, it is expected that the pressure of the medium flowing in the pipe will be higher than before, but in this case, even at the brazing place where the previous pressure had sufficient pressure resistance, it could not withstand the new high pressure It is also expected.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to realize a heat exchanger pipe / tube connecting structure in which a tube and pipe brazing point (welding fixing point) can withstand a higher pressure than ever before. It is in.

In the connecting structure of the heat exchanger pipe and the tube according to the first aspect of the present invention, the insertion portion of the tube inserted into the tube insertion hole of the heat exchanger pipe is tightly fixed to the inner surface of the pipe. .

According to a second aspect of the present invention, there is provided a connecting structure of a heat exchanger pipe and a tube, wherein the heat exchanger pipe is formed into a pipe by combining two pipe members, or a single plate is rolled into a pipe. The insertion part of the tube formed or previously formed in one pipe, and inserted into the tube insertion hole of the heat exchanger pipe is tightly fixed to the inner surface of the pipe.

According to a third aspect of the present invention, there is provided a connecting structure of a heat exchanger pipe and a tube, wherein the heat exchanger pipe is formed by combining two pipe members, and is inserted into a tube insertion hole of the heat exchanger pipe. The inserted portion of the inserted tube is tightly fixed to the inner surface of one or both of the two pipe members, and the two pipe members are also tightly fixed to each other.

According to a fourth aspect of the present invention, there is provided a connecting structure for connecting a heat exchanger pipe and a tube, wherein the two pipe members constituting the heat exchanger pipe have an abutting portion at an open end and a receiving portion for receiving the abutting portion. Both or one of the two is formed, the receiving portion and the abutting portion of the two pipe members are abutted to make the two pipe members face each other, and the insertion portion of the tube inserted into the tube insertion hole of the heat exchanger pipe is The inner surface of the pipe is closely fixed, and both pipe members are also closely fixed.

According to a fifth aspect of the present invention, there is provided a connecting structure for a heat exchanger pipe and a tube, wherein at least one of a fitting groove and an insertion portion is formed in two pipe members constituting the heat exchanger pipe. The fitting groove of the two pipe members and the insertion part are fitted, the insertion part of the tube inserted into the tube insertion hole of the heat exchanger pipe is tightly fixed to the inner surface of the pipe, and both pipe members are also closely fixed Have been.

According to a sixth aspect of the present invention, there is provided a heat exchanger pipe and tube connecting structure according to any one of the first to fifth aspects. The tight fixing and the tight fixing between the heat exchanger pipe and the insertion portion of the tube are by brazing.

According to a seventh aspect of the present invention, there is provided a connecting structure of a heat exchanger pipe and a tube according to any one of the first to sixth aspects. There is an insertion restricting portion that regulates the length of insertion into the insertion hole.

According to the eighth aspect of the present invention, there is provided a heat exchanger pipe and tube connecting structure according to any one of the first to seventh aspects, wherein the tube insertion hole and the tube insertion hole are inserted. The tube is also tightly fixed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) An example of a connecting structure of a pipe and a tube for a heat exchanger according to the present invention is shown in FIGS.
Shown in This is the opening 8, 9 of the two pipe members 6, 7
Are opposed to each other to form a pipe, and both pipe members 6,
A refrigerant passage 20 is formed between the two.

One pipe member 6 in FIGS. 1A to 1C has a shape in which a half cylinder is slightly flattened (a flat half cylinder). In the axial direction, as shown in FIG.
Are formed at intervals, a partition plate insertion hole 21 is opened between the tube insertion holes 2 at a predetermined position, and the end on the opening side serves as the abutting portion 10.

As shown in FIGS. 17 and 18, the tube insertion hole 2 is formed such that the long edge outer portion 16 of the tube insertion hole 2 is gradually pushed into the inside of the tube insertion hole 2 to form an inner protruding piece 17. At both ends in the longitudinal direction of the tube insertion hole 2, guide portions 18 which spread outward as shown in FIGS.
Are formed. The guide portion 18 in FIG. 19 (a) is formed so that the outer portion gradually extends linearly from the middle of the thickness of the pipe. The guide portion 18 shown in FIG. 19B is formed such that the outer portion gradually expands outward in an arc shape from the middle of the thickness of the pipe. 19 (c, d), an outer protrusion 19 is formed further outside the guide portion 18. FIG. The outer projection 19 is expanded outward as shown in FIGS. 15 and 19 (c, d), and is projected further outward than the outer peripheral surface of the pipe. In FIG. 19 (c), the portion from the guide portion 18 to the outer protrusion 19 extends in a straight line and extends outward. In FIG. 19D, the portion from the guide portion 18 to the outer protrusion 19 extends in a series and extends outward in an arc shape.

The heat exchanger pipe 1 shown in FIGS. 17 and 18 is formed in advance into a cylindrical pipe (seamless pipe).
However, one plate may be rounded into a pipe. The outer peripheral surface 40 of the heat exchanger pipe 1 of FIG. 17 has the same shape as the outer peripheral surface of a normal round pipe. In the heat exchanger pipe 1 of FIG. 18, the top 24 of the outer peripheral surface between the tube insertion holes 2 is formed slightly flat. The shape of the outer peripheral surface of the heat exchanger pipe 1 may be other than these shapes. For example, the outer peripheral surface between the tube insertion holes 2 has a dome shape (an arc shape or a drum shape).
It may swell outward. The shape and structure of the tube insertion hole 2 may be other than those described above.
It may be one in which the long edge outer portion 16 of the tube insertion hole 2 is not gradually pushed inward, one in which the inner protruding piece 17 is not formed, and the like. In addition, as shown in FIG. 22, the long edge outer portion 16 of the tube insertion hole 2 may be expanded outward in a circular arc shape, or may be expanded in a straight line (not shown).

The other pipe member 7 shown in FIGS. 1A to 1C is substantially semi-cylindrical and has a predetermined axial position between two tube insertion holes 2 at arbitrary positions as shown in FIG. At a position facing the partition plate insertion hole 21).
3 are opened side by side. This pipe member 7
Is formed such that an end on the opening side is bent inwardly into an L-shape to form a receiving portion 11 against which the abutting portion 10 of the other pipe member 6 can abut.

The pipe members 6, 7 and the partition plate E (FIG. 1)
5) As the material of the tube 3 or the like, a desired material is used. As an example, an aluminum plate provided with a thin film of a brazing material on both front and back surfaces or any one surface, a so-called clat material is suitable.

There are various methods for assembling the two pipe members 6 and 7 into a pipe shape. As an example, as shown in FIG. 15, a partition plate insertion hole 23 of one pipe member 7 and a partition plate E of FIG. The two insertion protruding pieces 25 are inserted as shown by phantom lines in FIG. 15, the partition plate E is set up inside the pipe member 7, and the other pipe member 6 is covered from above. At this time, the other insertion projection 26 (FIG. 15) of the partition plate E is inserted into the partition plate insertion hole 21 of the pipe member 6 covered. Also,
The abutting portion 10 of the placed pipe member 6 is placed outside the opening end of the lower pipe member 7 and abutted against the receiving portion 11 to assemble the heat exchanger pipe 1 as shown in FIG.

As shown in FIG. 1C, the tube 3 is inserted into the tube insertion hole 2 of one of the two pipe members 6, 7 assembled as shown in FIG. 1A. . A variety of tubes 3 having different shapes and structures can be used. One example of the tube 3 is shown in FIGS. 13A to 13C and 14A and 14B.
In these tubes 3, a plurality of medium passages 31 are formed in a horizontal line in a flat tubular tube body 30. FIG.
The tube of FIG. 3 (a) is a basic type, and the tube body 30
The outer surfaces 32 in the width direction are elliptical. In the tube 3 shown in FIG. 13B, elongated ridges 33 project from both outer surfaces 32 in the width direction of the tube main body 30, and the longitudinal ends of the ridges 33 are cut off, and the cut surface is inserted into the insertion regulating portion 13. The portion without the ridge is the insertion guide portion 34.
In the tube 3 of FIG. 13C, small pieces 35 are attached to both outer walls at both ends in the longitudinal direction of the tube main body 30. The outer end surface of the small piece 35 is used as the insertion regulating section 13, and the end side further than that is used as the insertion guide section 34. . Tube 3 in FIG.
Presses a part of both outer walls at both ends in the longitudinal direction of the tube main body 30 in the direction of the arrow in FIG.
An outer end face insertion regulating portion 13 of the small piece 36 is provided, and an end side of the small piece 36 is provided as an insertion guide portion 34. FIG.
In the tube 3 shown in FIG. 3B, the thinned portions of both outer walls at both ends in the longitudinal direction of the tube body 30 are crushed or crushed from both outer sides, and the thinned portion is used as the insertion guide 34.
The terminal surface is the insertion restricting portion 13. The tube 3 may have other shapes and structures. As an example, the tube 3 of FIG. 12 pushes both ends in the width direction of the tube main body 30 from both sides to form an insertion guide portion 34 that gradually becomes tapered, and a portion where the width of the tube main body 30 becomes wider is used as the insertion restriction portion 13. .

As described above, the insertion restricting portion 13 is inserted into the tube 3.
When the longitudinal end portion (insertion portion) 4 of the tube 3 is inserted into the tube insertion hole 2 by providing the insertion restriction portion 13 abuts against the outer peripheral surface of the tube insertion hole 2 and the tube 3 is not inserted any more. The insertion dimensions of the multiple tubes 3 inserted into the multiple tube insertion holes 2 are uniform.

As shown in FIG. 15, two pipe members 6, 7 are combined with a partition plate E interposed therebetween, and the tube 3 is inserted into the tube insertion hole 2 of one of the pipe members 6, so that a wavy shape (not shown) is formed between the tubes 3. When the fins are placed in a heating furnace and heated, the brazing material on the surfaces of these members is melted and the pipe members 6 and 7 are brazed and tightly fixed as shown in FIG. 1 (c). At the same time, the insertion guide portion 34 of the tube 3 is tightly fixed to the inner surface 5 of the pipe member 7, and the partition plate E is also tightly fixed to the pipe members 6 and 7 by being brazed, and the fins are tightly brazed to the tube 3. Fixed.

As shown in FIG. 17 and FIG.
Heat exchanger pipe 1 having an inner projecting piece 17 protruding inside
In the case where is used, as shown in FIG. 21, a dent (row pool) is formed between the long edge outer portion 16 and the inner protruding piece 17 and the tube 3 inserted into the tube insertion hole 2 and dissolved in the row pool. The row 51 is accumulated and the brazing is reliably and firmly performed.

As shown in FIGS. 19A and 19C, in the case of the heat exchanger pipe 1 in which the guide portions 18 extending outward at both ends in the longitudinal direction of the tube insertion hole 2 are formed, the guide portion 18 and the tube insertion hole 2 are used. A hollow is formed between the tube 3 and the tube 3 inserted into the tube, and as shown in FIGS. 19C and 19D, the outside protruding outside the outer peripheral surface of the pipe outside the guide portion 18 of the tube insertion hole 2. When the heat exchanger pipe 1 having the projections 19 formed thereon is used, the guide portion 18 and the outer projections 19 and the tube 3 inserted into the tube insertion hole 2 are used.
The melted solder is accumulated in the solder pool, so that both side surfaces 70 of the tube insertion hole 2 and the outer surface of the tube 3 inserted therein are tightly fixed by soldering. Will be sure and strong.

When the heat exchanger pipe 1 in which the insertion guide is formed by extending the long edge outer portion 16 of the tube insertion hole 2 to the outside as shown in FIG. 22, the long edge outer portion 16 and the tube insertion hole 2 are used. Tube 3 inserted
A hollow (row pool) is formed between them, and the melted row 51 accumulates in the row pool, and the brazing becomes reliable and strong.

When the tube 3 shown in FIGS. 13 (a, c) and 14 (a) is used, both outer surfaces 32 of the tube 3 in the width direction are used.
Is a circular arc, and when it is inserted into the tube insertion hole 2, a dent (row pool) 50 is formed between the outer surfaces 32 at both ends and the inner surface 5 of the pipe member 6 as shown in FIG. Then, the melted row is accumulated in the row pool 50, so that the brazing is reliably and firmly performed. When the tube 3 shown in FIG. 14B is used, since the insertion guide portion 34 of the tube 3 is flat, even if the insertion guide portion 34 is inserted into the tube insertion hole 2, as shown in FIG. Although there is no dent (row accumulation) between the insertion guide portion 34 and the inner surface 5 of the pipe member 6, the brazing becomes reliable and strong because the insertion guide portion 34 and the inner surface 5 of the pipe member 6 are in surface contact. .

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention. This is a combination of two pipe members 6,7. An abutting portion 10 and a receiving portion 11 are formed at the opening-side ends of the respective pipe members 6 and 7, and the two pipe members 6 and 7 are assembled by abutting the respective abutting portions 10 against the receiving portion 11. It is matched. The pipe 1 for a heat exchanger has outer surfaces 32 at both ends of an insertion portion 4 of a tube 3 inserted into a tube insertion hole 2 of a pipe member 6.
The two pipe members 6, 7 are also closely fixed to each other by brazing.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention. This heat exchanger pipe 1 is also a combination of two pipe members 6, 7, and one of the pipe members 6
Abutting portions 10 are formed at both ends of the opening on both sides, and receiving portions 11 are formed at ends of both openings of the other pipe member 7. The two pipe members 6 and 7 are assembled by abutting the butting portion 10 of one pipe member 6 against the receiving portion 11 of the other pipe member 7. The insertion portion 4 of the tube 3 is inserted into the tube insertion hole 2 formed in the pipe member 7, and both outer surfaces 32 of the insertion portion 4 are tightly fixed to the inner surface 5 of the pipe 1 by brazing. , 7 are also tightly fixed by brazing.

(Embodiment 4) FIG. 4 shows a fourth embodiment of the present invention. In this method, one of the pipe members 7 is formed in a rectangular cylindrical shape having one open side, and insertion grooves 61 are formed on both side walls 60 of the pipe member 7. A plate-like pipe member 6 is inserted into the insertion grooves 61, and the tube of the pipe member 6 The insertion portion 4 of the tube 3 is inserted into the insertion hole 2, and both outer surfaces 32 of the insertion portion 4 are inserted.
Is fixed to the inner surface 5 of the pipe 1 by brazing, and the two pipe members 6, 7 are also fixed to each other by brazing.

(Embodiment 5) FIG. 5 shows a fifth embodiment of the present invention. In this case, one pipe member 7 is formed into a square half-cylinder shape having an open top in FIG. 5, and the other pipe member 6 is formed as shown in FIG.
Of the pipe member 7 having a rectangular shape with an opening at the lower part, receiving portions 11 are formed at both ends of the pipe member 7 having the shape of a square cylinder, and both ends of the other pipe member 6 are protruded. The abutting portion 10 of the pipe member 6 abuts against the receiving portion 11 of the pipe member 7 to combine the two pipe members 6 and 7 to form the heat exchanger pipe 1. Further, the insertion portion 4 of the tube 3 inserted into the tube insertion hole 2 of the pipe member 6.
The two outer surfaces 32 are tightly fixed to the inner surfaces 5 of the two pipe members 6 and 7 by brazing, and the two pipe members 6 and 7 are also closely fixed to each other by brazing.

(Embodiment 6) FIG. 6 shows a sixth embodiment of the present invention. In this case, one of the pipe members 7 is formed into a square half-cylinder shape having an opening at the top of the drawing, and L-shaped receiving portions 11 are formed at both ends on both sides of the opening, and the other pipe member 6 is formed at the bottom of the drawing. It has the shape of an open-walled square plate, with abutting portions 10 formed at both ends thereof, and a fitting groove 64 formed therein. Both ends 65 on the opening side of the other pipe member 7 are fitted into the fitting grooves 64 of the pipe member 6, and the abutting portion 10 of the pipe member 6 abuts against the receiving portion 11 of the other pipe member 7, so that the two pipe members The members 6 and 7 are combined to form the heat exchanger pipe 1. Further, both outer surfaces 32 of the insertion portion 4 of the tube 3 inserted into the tube insertion hole 2 of the pipe member 7.
Is fixed to the inner surface 5 of the pipe member 7 by brazing, and the two pipe members 6, 7 are also fixed to each other by brazing.

(Embodiment 7) FIG. 7 shows a seventh embodiment of the present invention. In this case, one pipe member 6 has an open upper part in the drawing, and has a half-tubular shape having an opening opposite to the opening, and the other pipe member 7 has a flat half-tubular shape having an open lower part in the drawing. The heat exchanger pipe 1 is obtained by combining the pipe members 6 and 7. The tube 3 is inserted into the tube insertion hole 2 of the pipe member 7, and the insertion portion 4
Both outer surfaces 32 of the pipe members 6 are tightly fixed to the inner surface 5 of the pipe member 6 by brazing, and the two pipe members 6, 7 are also closely fixed to each other by brazing. In this case, since the lower part of the pipe member 6 becomes gradually thinner, as the insertion part 4 of the tube 3 is inserted, the tip of the insertion part 4 abuts against the inner surface 5 of the pipe member 6 and is positioned.

(Eighth Embodiment) FIGS. 8A and 8B show an eighth embodiment of the present invention. In this case, the insertion portion 44 formed in the other pipe member 6 is fitted into the fitting groove 12 formed in one pipe member 7, and the two pipe members 6, 7 are combined to form the heat exchanger pipe 1. In addition, both outer surfaces 32 of the insertion portion 4 of the tube 3 inserted into the tube insertion hole 2 of the pipe member 6 are tightly fixed to the inner surface 5 of the pipe member 7 by brazing. It is tightly fixed by attaching. In this case, the fitting groove 1
When the insertion portion 44 of the other pipe member 6 is inserted from one end in the axial direction and slid and fitted, the fitting is facilitated.
In FIG. 8 (b), the tube 3 is inserted into the tube insertion hole 2 of the pipe member 6, and this is heated so that both the pipe members 6, 7 are heated.
Attach and fix each other by brazing
The outer surfaces 32 of the insertion portions 4 are tightly fixed to the inner surfaces 5 of the pipe members 6 and 7 by brazing.

(Embodiment 9) FIGS. 9A and 9B show a ninth embodiment of the present invention. Also in this case, the fitting groove 12 is formed in one of the pipe members 7, the insertion portion 44 is formed in the other pipe member 6, and the inner butt portion 66 of the pipe member 7 can butt against the pipe member 6. A contact receiving portion 67 is formed. The two pipe members 6, 7 fit the insertion portion 44 of the pipe member 6 into the fitting groove 12 of one of the pipe members 7, and push the inner butting portion 66 of the pipe member 7 into the butting receiving portion 67 of the pipe member 6. The two pipes 6 and 7 are combined to form a heat exchanger pipe 1. Also, the pipe member 6
The tube 3 is inserted into the tube insertion hole 2 of the tube 3 and heated to fix both the pipe members 6 and 7 in close contact with each other by brazing, and the outer surfaces 32 at both ends of the insertion portion 4 of the tube 3.
Are tightly fixed to the inner surfaces 5 of both pipe members 6, 7 by brazing.

(Embodiment 10) FIG. 10 shows a tenth embodiment of the present invention.
An embodiment will be described. This is because the fitting groove 12 is formed in the pipe member 7, the insertion portion 44 is formed in the pipe member 6, and when the insertion portion 44 is fitted into the fitting groove 12, a gap is formed between the pipe members 6 and 7. I can do it. In this case, the insertion of the insertion portion 44 into the fitting groove 12 becomes easy. After the fitting, the upper part 68 of the outer wall of the pipe member 7 is crimped inward and downward and pressed against the upper surface of the pipe member 6 to make the fitting of the two pipe members 6 and 7 dense, and then the two pipe members 6 and 7 are brazed together. And tightly fixed with the
The outer surfaces 32 at both ends are tightly fixed to the inner surfaces 5 of the pipe members 6 and 7 by brazing.

(Embodiment 11) FIG. 11 shows an eleventh embodiment of the present invention.
An embodiment will be described. This is achieved by forming a tube insertion hole 2 in a round pipe having both sides straight and forming a pipe 1 for a heat exchanger.
The tube 3 is inserted into the insertion hole 2, and the outer surfaces 32 at both ends of the insertion portion 4 of the tube 3 are connected to the inner surface 5 of the pipe 1.
To be fixed tightly by brazing.

(Embodiment 12) Embodiments 1 to 11
In any case, the tube insertion hole 2 and the tube 3 inserted therein are also tightly fixed by brazing. Specifically, as in the conventional case, the inner surface of the tube insertion hole 2 and the outer peripheral surface of the insertion portion of the tube 3 inserted therein are tightly fixed by brazing.

(Embodiment 13) In all of the above embodiments, the close contact fixing can be performed by a method other than brazing.

[0041]

In the connecting structure of the heat exchanger pipe and the tube according to any one of the first to seventh aspects, the tube is fixed to the inner surface of the heat exchanger pipe so that the tube is brazed only to the peripheral edge of the tube insertion hole. As compared with the conventional brazing which is not performed, the brazing of the tube to the pipe is more reliable, and the inside of the pipe has a higher pressure (for example, several hundred K).
Even in the case of g), there is no risk of cracking at the brazing point, peeling of the tube from the pipe member, and leakage of the medium.

According to a third aspect of the present invention, in the connecting structure for a heat exchanger pipe and a tube, the tube is closely fixed to an inner surface of the heat exchanger pipe formed by combining two pipe members, and the pipe members are also connected to each other. Since it is tightly fixed, the brazing is assured and there is no risk of medium leakage. Further, since the two pipe members to be combined have the abutting portion and the receiving portion for receiving the abutting portion, the combination of the two pipe members becomes easy.

In the connecting structure according to the fifth aspect, the insertion portion of the other pipe member is fitted into the fitting groove of one pipe member, so that the fitting of the two pipe members is further ensured.

In the connecting structure according to the sixth aspect, since the two parts, such as the tight fixing of the combined pipe members and the tight fixing of the heat exchanger pipe and tube, are brazed, the tight fixing is ensured.

In the connecting structure according to the seventh aspect, since the insertion restricting portion for restricting the insertion length of the heat exchanger pipe into the tube insertion hole is formed on the side surface of the tube, the insertion length of the tube into many tube insertion holes. And the flow of the medium in the pipe becomes smooth.

In the connecting structure according to the eighth aspect, the tube insertion hole and the tube inserted therein are tightly fixed, so that the tube and the pipe are surely tightly fixed.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view illustrating a first embodiment of a heat exchanger pipe in a heat exchanger pipe / tube connection structure of the present invention, FIG. 1B is an exploded explanatory view of the pipe, and FIG.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view of a heat exchanger pipe and tube of the present invention.

FIG. 2 is an end view showing a second embodiment of the present invention.

FIG. 3 is an end view showing a third embodiment of the present invention.

FIG. 4 is an end view showing a fourth embodiment of the present invention.

FIG. 5 is an end view showing a fifth embodiment of the present invention.

FIG. 6 is an end view showing a sixth embodiment of the present invention.

FIG. 7 is an end view showing a seventh embodiment of the present invention.

FIG. 8A is a cross-sectional view showing another embodiment of the present invention,
(B) is an explanatory view showing an eighth embodiment of the present invention, (c)
FIG. 4 is an exploded explanatory view showing another example of the heat exchanger pipe.

9A is a cross-sectional view showing another embodiment of the heat exchanger pipe according to the present invention, and FIG. 9B is an explanatory view showing a ninth embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a tenth embodiment of the present invention.

FIG. 11 is an explanatory view showing an eleventh embodiment of the present invention.

FIG. 12 is a partial plan view showing an embodiment of a tube according to the present invention.

13 (a), (b) and (c) are perspective views showing different embodiments of a tube according to the present invention.

14 (a) and 14 (b) are perspective views showing another embodiment of the tube according to the present invention.

FIG. 15 is an explanatory view showing an example of assembling a heat exchanger pipe according to the present invention.

FIG. 16 is an explanatory view showing an example of a partition plate in the present invention.

FIG. 17 is a partially cutaway explanatory view showing an example of a heat exchanger pipe according to the present invention.

FIG. 18 is a partially cutaway explanatory view showing another example of the heat exchanger pipe according to the present invention.

FIGS. 19A to 19D are cross-sectional views of a tube insertion hole of a heat exchanger pipe according to the present invention.

FIGS. 20 (a) and (b) are longitudinal sectional front views of different examples in which a tube is inserted into a tube insertion hole of a heat exchanger pipe according to the present invention.

FIG. 21 is a longitudinal sectional side view showing a state where a tube is inserted into a tube insertion hole of a heat exchanger pipe according to the present invention.

FIG. 22 is a longitudinal side view of a different example of a state where a tube is inserted into a tube insertion hole of a heat exchanger pipe according to the present invention.

FIG. 23 is an exploded view of a conventional parallel flow type heat exchanger.

FIG. 24 is a diagram illustrating the flow of a medium in a parallel flow type heat exchanger.

FIG. 25 is an exploded explanatory view showing an example of a parallel flow type heat exchanger pipe developed earlier by the present applicant.

FIG. 26 is a longitudinal sectional view showing an example of a parallel flow type heat exchanger developed earlier by the present applicant.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat exchanger pipe 2 tube insertion hole 3 tube 4 insertion portion 5 inner surface 6, 7 pipe member 8, 9 opening 10 abutting portion 11 receiving portion 12 fitting groove 13 insertion regulating portion

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takeo Masuda 239-4, Kamirencho, Isesaki-shi, Gunma F-term (reference) 3L065 FA15

Claims (8)

[Claims] An insertion part (4) of a tube (3) inserted into a tube insertion hole (2) of a heat exchanger pipe (1).
Is fixedly attached to the inner surface (5) of the pipe (1). 2. A heat exchanger pipe (1) formed by combining two pipe members (6, 7) to form a pipe (1) or a sheet formed by rolling a single plate to form a pipe (1). Or a tube previously formed in a single pipe, and a tube insertion hole (2) of the heat exchanger pipe (1).
A connection structure between a pipe for a heat exchanger and a tube, wherein an insertion portion (4) of the tube (3) inserted into the pipe (1) is tightly fixed to an inner surface (5) of the pipe (1). 3. A heat exchanger pipe (1) formed by combining two pipe members (6, 7), and a tube inserted into a tube insertion hole (2) of the heat exchanger pipe (1). The insertion part (4) of (3) is tightly fixed to the inner surface (5) of one or both pipe members (6, 7), and the two pipe members (6, 7) are also tightly fixed to each other. Heat exchanger pipe and tube connection structure. 4. An abutting portion (10) for an open end of two pipe members (6, 7) constituting a heat exchanger pipe (1).
And / or a receiving part (11) for receiving the abutting part (10) is formed, and the receiving part (11) of the two pipe members (6, 7) and the abutting part (10) are abutted. The two pipe members (6, 7) are opposed to each other, and the insertion portion (4) of the tube (3) inserted into the tube insertion hole (2) of the heat exchanger pipe (1) is the inner surface of the pipe (1). (5)
A heat exchanger pipe and tube connection structure, wherein both pipe members (6, 7) are closely fixed to each other. 5. A fitting groove (12) and an insertion portion (1) in two pipe members (6, 7) constituting a pipe (1) for a heat exchanger.
1) is formed, the fitting groove (12) of the two pipe members (6, 7) and the insertion portion (11) are fitted, and the tube insertion hole of the heat exchanger pipe (1) is formed. The insertion part (4) of the tube (3) inserted into (2) is fixed tightly to the inner surface (5) of the pipe (1), and both pipe members (6, 7) are also fixed tightly to each other. Characteristic connection structure of pipe and tube for heat exchanger. 6. The heat exchanger pipe and tube connecting structure according to claim 1, wherein the combined pipe members (6, 7) are closely adhered to each other, and the heat exchanger pipe ( Insertion part (4) of 1) and tube (3)
The connection structure of pipes and tubes for heat exchangers, characterized in that brazing is tightly attached to the pipe. 7. A connecting structure of a pipe and a tube for a heat exchanger according to claim 1, wherein the tube (3) has an insertion portion (4) formed in a side surface of an insertion portion (4). A connection structure between a heat exchanger pipe and a tube, wherein an insertion regulating portion (13) for regulating an insertion length is formed. 8. The connecting structure of a pipe and a tube for a heat exchanger according to claim 1, wherein the tube insertion hole (2) and the tube (3) inserted therein.
A connection structure between a heat exchanger pipe and a tube, wherein the pipe and the tube are fixed to each other.