Heat exchanger

Abstract

A heat exchanger includes a pair of tanks, and a heat exchanger core arranged therebetween and having tubes and fins. The tanks includes a tube plate connected with the tubes, a tank plate and at least two partition plates, where the tube plate, the tank plate and the partition plates are integrally fixed by blazing after the tube plate and the tank plate are temporarily assembled with each other to temporarily fix the partition plates between the tube plate and the tank plate. At least one of the tube plate and the tank plate is formed to have a misalignment preventing portion for preventing misalignment in a longitudinal direction of the tube plate and the tank plate between the temporarily assembled tube plate and tank plate.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat exchanger whose tank is formed by coupling a tube plate and a tank plate with each other.

2. Description of the Related Art

A conventional heat exchanger is disclosed in Japanese utility model laid-open publication No. (Jikkaishou) 57-38169. The conventional heat exchanger has a pair of tanks and a heat exchanger core arranged between the tanks and having a plurality of tubes and corrugated fins.

Recently, in order to simplify and downsize configurations of tank parts of a heat exchanger and decrease the number of the tank parts, tanks are constructed by coupling a tube plate and a tank plate with each other so as to contain at least two partition plates therein, where the tube plate and the tank plate are shaped in a half-cylinder and end portions of tubes of the heat exchanger core are inserted into and fixed to the tube plate.

In the above-constructed tanks, the tube plate, the tank plate and the partition plates are temporarily assembled with one another, and upper and lower mounting brackets are inserted into and temporarily fixed to a top portion and a bottom portion of the on-lapped, temporarily coupled, tube plate and tank plate, respectively. Then, the entire temporarily-assembled tank is placed in a heat furnace to be integrally fixed by blazing.

The above known conventional heat exchanger, however, encounters such the following problem. The tube plate and the tank plate often become misaligned in a longitudinal direction thereof from their proper positions in a temporary assembly process of the on-lapped tube plate and tank plates and the mounting brackets and/or in a blazing process thereof. This misalignment between the tube plate and the tank plate in the above processes may be avoided by restricting their position with using a jig, which increases its manufacturing processes to deteriorate its productivity rate.

It is, therefore, an object of the present invention to provide a heat exchanger which overcomes the foregoing drawbacks and can prevent misalignment between a tube plate and a tank plate in a longitudinal direction thereof in a temporary assembly process of the temporarily coupled tube plate and tank plate and a mounting bracket and/or in a blazing process thereof without using a jig, thereby increasing its productivity rate.

SUMMARY OF THE INVENTION

According to the first aspect of the present invention there is provided a tank structure of a heat exchanger including a pair of tanks, and a heat exchanger core arranged between the tanks and having a plurality of tubes and fins whose one end portions are fluidically connected with one of the tanks and the other end portions are fluidically connected with the other of the tanks. The tanks includes a tube plate connected wit the tubes, a tank plate and at least two partition plates, where the tube plate, the tank plate and the partition plates are integrally fixed by blazing after the tube plate and the tank plate are temporarily assembled with each other to temporarily fix the partition plates between the tube plate and the tank plate. At least one of the tube plate and the tank plate is formed to have a misalignment preventing portion for preventing misalignment in a longitudinal direction of the tube plate and the tank plate between the temporarily assembled tube plate and the tank plate.

Therefore, the heat exchanger can prevent misalignment between the tube plate and the tank plate in the longitudinal direction thereof in a temporary assembly process of the temporarily coupled tube plate and tank plate and the mounting bracket and/or in a blazing process thereof without using a jig, thereby increasing its productivity rate.

Preferably, the misalignment preventing portion is a first projecting portion formed on an end portion of one of the tube plate and the tank plate by cutting off a part of the end portion, and the first projecting portion is bent at an axial outer side of an end portion of the other of the tube plate and the tank plate so that the first projecting portion is contactable with the end portion of the other of the tube plate and the tank plate.

Therefore, the misalignment preventing portion can be formed easily and at low manufacturing costs by cutting-off and bending.

Preferably, the misalignment preventing portion is a second projecting portion formed on an end portion of one of the tube plate and the tank plate, and the second projecting portion is projected inwardly from an inner surface of the end portion at an axial outer side of an end portion of the other of the tube plate and the tank plate to be contactable with the end portion of the other of the tube plate the and tank plate.

Therefore, the misalignment preventing portion can be formed easily and at low manufacturing costs by press-forming.

Preferably, the misalignment preventing portion is formed on the tube plate and the tank plate to form at least one of a projecting portion, a depression and an opening for fixing the partition plates so that a relative movement between the tube plate and the tank plate in the longitudinal direction can be restricted by the partition plates.

Therefore, the misalignment preventing portion can be formed easily and at low manufacturing costs by press-forming for deforming and/or opening.

BRIEF DESCRIPTION OF THE DRAWINGS

The objects, features and advantages of the present invention will become apparent as the description proceeds when taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a front view showing a left tank having upper and lower mounting brackets, and a right tank having upper and lower mounting brackets and equipped with a receiver, a condenser core, of a condenser, which is a heat exchanger of a first embodiment according to the present invention;

FIG. 2 is an enlarged fragmentary cross-sectional front view showing the left tank and the condenser core of the condenser shown in FIG. 1;

FIG. 3 is an expanded view showing the upper and lower mounting brackets, a tube plate, a tank plate, partition plates and upper and lower connectors of the left tank of the condenser shown in FIG. 1;

FIG. 4 is an expanded and enlarged fragmentary perspective view showing a top portion, indicated by a circle A in FIG. 1, of the left tank shown in FIGS. 1 and 3;

FIG. 5 is an expanded and enlarged fragmentary perspective view showing an intermediate portion, indicated by a circle B in FIG. 1, of the left tank shown in FIGS. 1 and 3;

FIG. 6 is an enlarged fragmentary perspective view showing the top portion, where the tube plate and the tank plate are lapped on each other to be temporarily assembled, of the left tank shown in FIGS. 1 and 3;

FIG. 7 is an enlarged fragmentary perspective view showing the intermediate portion, where the tube plate and the tank plate are lapped on each other to be temporarily assembled, of the left tank shown in FIGS. 1 and 3;

FIG. 8 is an enlarged fragmentary perspective view showing the top portion, where the tube plate and the tank plate, which are temporarily assembled by bending first projecting portions of the tube plate inwardly, and the upper mounting bracket are to be temporarily assembled, of the left tank shown in FIGS. 1 and 3;

FIG. 9 is an enlarged fragmentary perspective view showing the intermediate portion, where the tube plate and the tank plate are temporarily assembled by bending clawing portions of the tube plate toward the tank plate, of the left tank shown in FIGS. 1 and 3;

FIG. 10 is an expanded fragmentary perspective view showing a top end portion of a left tank used in a heat exchanger of a second embodiment according to the present invention;

FIG. 11 is a perspective view showing the top end portion of the left tank shown in FIG. 10, where the tube plate and the tank plate, which are temporarily coupled, and an upper mounting bracket are to be temporarily assembled;

FIG. 12 is a fragmentary cross-sectional front view showing a left tank and a condenser core of a condenser which is a heat exchanger of a third embodiment according to the present invention; and

FIG. 13 is fragmentary cross-sectional front view showing a left tank and a condenser core of a condenser which is a heat exchanger of a fourth embodiment according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Throughout the following detailed description, similar reference characters and numbers refer to similar elements in all figures of the drawings.

A condenser of an embodiment according to the present invention will be described with reference to the accompanying drawings.

A condenser 100 is used for an air conditioning system and mounted on a front portion of a not-shown vehicle body of a motor vehicle. In this description, terms “left” and “right” are used with respect to the vehicle body, not corresponding to those in the drawings.

The condenser 100 includes a pair of tanks consisting of a left tank 1 and a right tank 2 that are arranged apart from each other in a lateral direction of the vehicle body and a condenser core 3 that is arranged between the left and right tanks 1 and 2 for cooling refrigerant flowing therethrough.

The condenser core 3 has a plurality of tubes 5 for flowing the refrigerant therethrough from one of the left and right tanks 1 and 2 to the other thereof and corrugated fins 6 for radiating heat of the refrigerant flowing in the tubes 5, where the tubes 5 and the corrugated fins 6 are arranged alternately to each other in a vertical direction of the condenser 100 and extend in a horizontal direction thereof. The tubes 5 are fluidically connected with the left and right tanks 1 and 2 at their left and right end portions. The condenser core 3 further has an upper reinforcement member 7a and a lower reinforcement member 7b at its highest position and its lowest position, respectively, their left and right end portions being fixed to the left and right tanks 1 and 2 for ensuring strength of the condenser 100.

The left and right tanks 1 and 2 are constructed almost similarly to each other and arranged in directions opposite to each other.

The left tank 1 is fixed with a left upper mounting bracket T1 and a left lower mounting bracket T2 at its top and bottom end portions, respectively. Similarly, the right tank 2 is fixed with a right upper mounting bracket T3 and a right lower mounting bracket T4 at its top and bottom end portions, respectively.

The left tank 1 is provided with an upper connector P1 and a lower connector P2 at an upper portion and a lower portion thereof, respectively, for fluidically connecting not-shown units, such as a compressor and an evaporator, of the air conditioning system via not-shown pipes. The right tank 2 is provided with a receiver 12 for gas-liquid separating and temporarily storing excessive refrigerant to regulate a variation of a circulating refrigerant amount, and the receiver 12 is fluidically connected with the right tank 2 through a first connecting pipe 12a and a second connecting pipe 12b.

As shown in FIGS. 2 to 5, the left tank 1 is constructed by coupling a tube plate 8 and a tank plate 9, both of which are shaped in a half-cylinder, with each other to form an interior space having a four-round-cornered rectangle shape in cross section. The interior space of the left tank 1 is divided by four partition plates, consisting of a first partition plate D1, a second partition plate D2, a third partition plate D3 and a fourth partition plate D4, to define the interior space into three rooms, a first room R1, a third room R3, and a sixth room R6 as shown in FIG. 1.

The right tank 2 is also constructed by coupling a tube plate and a tank plate, both of which are shaped in a half-cylinder, with each other to form an interior space having a four-round-cornered rectangle shape in cross section. The interior space of the right tank 2 is divided by four partition plates, consisting of a fifth partition plate D5, a sixth partition plate D6, a seventh partition plate D7 and an eighth partition plate D8, to define the interior space into three rooms, a second room R2, a fourth room R4, and a fifth room R5 as shown in FIG. 1.

The first and fifth partition plates D1 and D5 of the left and right tanks 1 and 2 are located in the same height and at a position higher than those of the other partition plates. The second partition plate D2 of the left tank 1 is located higher than the sixth partition plate D6 of the right tank 2, which is located higher than the third partition plate D3 of the left tank 1. The third partition plate D3 of the left tank 1 and the seventh partition plate D7 of the right tank 2 are located in the same height and higher than the fourth partition plate D4 of the left tank 1 and the eighth partition plate D8 of the right tank 2. The fourth partition plate D4 and the eighth partition plate D8 are in the same height. Although the seventh partition plate D7 and the third partition plate D3 are located in the same height, the fourth room R4 is fluidically connected with the fifth room R5 through the first connecting pipe 12a, the receiver 12 and the second connecting pipe 12b.

Accordingly, the refrigerant can flow in turn from the upper connector P1 through the first room RI of the left tank 1, the tubes 5 connecting the first room 1 and the second room 2, the second room R2 of the right tank 2, the tubes 5 connecting the room R2 and the third room R3, the third room R3 of the left tank 1, the tubes 5 connecting the third room R3 and the fourth room R4, the fourth room R4 of the right tank 5, the first connecting pipe 12a, the receiver 12, the second connecting pipe 12b, the fifth room R5 of the right tank 2, the pipes 5 connecting the fifth room R5 and the sixth room R6, the sixth room R6 of the left tank 1 toward the lower connector P2.

In order to fix the first to eighth partition plates D1 to D8 on the left and right tanks 1 and 2, as shown in FIGS. 4 to 5, the tube plates 8 of the left and right tanks 1 and 2 are formed on their inner surfaces with four pairs of inwardly projecting portions 8c for clamping one side portions of the first to fourth partition plates D1 to D4 and the fifth to eighth partition plates D5 to D8, respectively, and the tank plates 9 of the left and right tanks 1 and 2 are formed with four openings 9a for receiving projecting portions 10 formed on the other side portions of the first to fourth partition plates D1 to D4 and the fifth to eighth partition plates D5 to D8, respectively. The inwardly projecting portions 8care formed in a half-cylindrical shape in this embodiment, but their configuration may be set arbitrarily. The inwardly projecting portions 8c, the openings 9a, and the projecting portions 10 act as a misalignment preventing portion of the present invention.

The tube plates 8 of the left and right tanks 1 and 2 are formed with a plurality of tube-holes 4 so that the tube-holes 4 are inserted by the end portions the tubes 5 of the condenser cores 3 and receive them. The upper portions and the lower portions of the tube plates 8 respectively have a pair of cut-off portions 8a at their side walls to form a pair of first projecting portions 8b projecting toward the tank plates 9. The first projecting portions 8b act as the misalignment preventing portion of the present invention. The tube plates 8 are formed longer in its longitudinal direction than the tank plates 9 so that the first projecting portions 8b can be located over or on top and bottom portions of the tank plates 9 in the vertical direction when the tube plate 8 and the tank plate 9 are coupled with each other as shown in FIG. 8. The intermediate portions of the tube plates 8 are formed with eight pairs of cut-off portions 8d at their side walls, two closing pairs thereof being apart from other two closing pairs in the vertical direction, to form a pair of clawing portions 8e located between the two closing pairs of the cut-off portions 8d and projecting toward the tank plates 9. Configuration, positions and the number of the clawing portions 8e may be set arbitrarily.

The tank plate 9 of the left tank 1 is formed at its upper and lower portions with not-shown upper and lower communicating holes for fluidically communicating with the upper and lower connectors P1 and P2, respectively as shown in FIG. 1. The tank plate of the right tank 2 is formed at its intermediate portion with not-shown upper and lower communicating holes for fluidically communicating with the first and second connecting pipes 12a and 12b.

The left and right upper mounting brackets T1 and T3 and the left and right lower mounting brackets T2 and T4 are used for fixing the condenser 100 to a vehicle side, such as a not-shown radiator or a not-shown radiator core support member. As shown in FIGS. 3, 4 and 8, they are formed to have a disc portion 11a, a mounting portion 1b and a fixing portion 11c, where the mounting portions 11b are shaped in a cylindrical column projecting from one-side surface of the disc portion 11a in a direction opposite to the left and right tanks 1 and 2, and the fixing portions 11c are shaped in a cylindrical column projecting from the other-side surface of the disc portion 11a in a direction toward the left and right tanks 1 and 2. Configuration of the mounting brackets T1 to T4 may be set arbitrarily according to a structure fixing the condenser 100 to the vehicle side.

The upper and lower connectors P1 and P2 are constructed similarly to each other, and arranged in different directions as shown in FIG. 3. Incidentally, tube-plate-side side wall portions of the upper and lower connecters P1 and P2 are formed to have an arc surface fittable to an outer surface of the tank plate 9. Configuration of the upper and lower connector P1 and P2 may be set arbitrarily according to a fixing structure of a vehicle-side adapter.

All parts of the condenser 100, including the left and right tanks 1 and 2, the condenser core 3, the upper and lower reinforcement members 7a and 7b, the receiver 12, the first and second connecting pipes 12a and 12b, the mounting brackets T1 to T4 and the upper and lower connectors P1 and P2, are made of aluminum. The condenser 100 is obtained by blazing connecting portions of the parts.

The condenser 100 is manufactured as follows.

In order to build the left and right tanks 1 and 2, the upper and lower connectors P1 and P2 are brought to temporarily fixed to the tank plate 9 by caulking for example.

Then, as shown in FIGS. 4 and 5, the first to fourth partition plates D1 to D4 and the fifth partition plates D5 to D8 are placed in the tank plates 9 of the left and right tanks 1 and 2, respectively, with their projecting portions 10 of the partition plates D1 to D8 being inserted into the openings 9a of the tank plates 9. Then, the tube plates 8 are brought to face and lap on the tank plates 9, respectively, and their side portions opposite to the projecting portions 10 are inserted between and held by the closing inwardly projecting portions 8c. The tube plates 8 and the tank plates 9 are laid on each other, holding the first to fourth partition plates D1 to D4 and the fifth to eighth partition plates D5 to D8 therein, respectively. In this state where the tube plate 8 receives the tank plate 9 therein, the first projecting portions 8b are positioned over or on the top and bottom end portions of the tank plate 9 as shown in FIG. 6.

The upper and lower first projecting portions 8b are bent inwardly to come closer to or contact with the top and bottom end portions of the tank plate 9, respectively, as shown in FIG. 8.

The clawing portions 8e shown in FIG. 7 are bent inwardly to fix the tank plate 9 by caulking as shown in FIG. 9.

Then, the left and right upper and lower mounting brackets T1 to T4 are temporarily assembled, being inserted between and temporarily fixed by the tube plate 8 and the tank plate 9 at the top and bottom end portions of the left and right tanks 1 and 2.

The right tank 2 is temporarily assembled similarly to the left tank 1 in addition to fixing the receiver 12 and the first and second connecting pipes 12a and 12b instead of the upper and lower connectors P1 and P2.

The tubes 5, the corrugated fins 6 and the upper and lower reinforcement members 7a and 7b are temporarily assembled with the left and right tanks 1 and 2. At least one sides of the connecting portions of the condenser 100 are provided with cladding layers, blazing sheets, made of blazing filler metal, and then this temporarily assembled condenser 100 is fed to be placed in a heat furnace, where it is heated so that all the connecting portions can be integrally fixed with each other by blazing.

Incidentally, temporary assembly of the condenser core 3, consisting of the tubes 5, the corrugated fins 6, and the upper and lower reinforcement members 7a and 7b, and the left and right tanks 1 and 2 may be carried out in a proper process. In this embodiment, outer surfaces of the both edge portions of at least the tank plate 9 are provided with cladding layers for fixing it to the tube plate 8 by blazing, and outer surfaces of its intermediate portion are also provided with cladding layer for fixing the upper and lower connectors P1 and P2 thereto by blazing.

Note that a relative movement between the tube plate 8 and the tank plate 9 in the axial direction thereof are restricted by the first projecting portions 8b, and the inwardly projecting portions 8c and the openings 9a both for receiving the partition plates D1 to D8 in a temporary assembly process and in a blazing process.

After a blazing process, the condenser 100 is conveyed and attached on a not-shown radiator core by fixing the mounting brackets T1 to T4 to not-shown radiator-core connectors, and then they are mounted on the front portion of the vehicle body to be connected with the vehicle-side units through the pipes.

The operation of the condenser 100 will be described.

The first room R1 of the condenser 100 is fed with the refrigerant at approximately 70° C. through the connecting hole 21 of the upper connector P1 from a not-shown compressor. The refrigerant in the first room R1 flows toward the second room R2 via the tubes 5 connecting between the first and second rooms R1 and R2, where it is cooled by heat radiation through the corrugated fins 6 hit by air flow caused by vehicle-running and/or a not-shown motor fan.

Then, the refrigerant in the second room R2 flows toward the third room R3 via the tubes 5 connecting therebetween, where it is cooled similarly to that flowing between the first and second rooms R1 and R2. The refrigerant in the third room R3 flows toward the fourth room R4 via the tubes 5 connecting therebetween, being cooled similarly, and the refrigerant in the fourth room R4 flows via the first connecting pipe 12a to the receiver 12, where the refrigerant is separated into gas and liquid to be temporarily stored for regulating a variation of the circulating refrigerant amount. The refrigerant in the receiver 12 goes to the fifth room R5 via the second connecting pipe 12b, and then flows toward the sixth room R6 via the tubes 5 connecting therebetween, being cooled down to approximately 45° C.

This cooled refrigerant is discharged through the connecting hole 21 of the lower connector P2 toward a not-shown evaporator.

The condenser 100 of the embodiment has the following advantages.

At least one of the first projecting portions 8b, and the inwardly projecting portions 8c and the openings 9a both for receiving the partition plates D1 to D8 can restrict the relative movement between the tube plate 8 and the tank plate 9 in the axial direction thereof in a temporary assembly process and in a blazing process without using a jig. The first projecting portions 8b, and the inwardly projecting portions 8c and the openings 9a can be easily formed by press-forming. Therefore, this condenser 100 can improve its productivity rate easily and at low manufacturing costs.

Next, a condenser of a second embodiment according to the present invention will be described with reference to the accompanying drawings.

Referring to FIGS. 10 and 11, there is shown an upper portion of a left tank of the condenser of the second embodiment.

The left tank includes a tube plate 20, a tank plate 9, a plurality of partition plates (only a first partition plate D1 being illustrated in FIG. 10), an upper mounting bracket T1 and a not-shown lower mounting bracket. The tube plate 20 is set longer in a longitudinal direction thereof than the tank plate 9, and is formed with a pair of second projecting portions 21 instead of the first projecting portions 8b of the first embodiment. The second projecting portions 21 are formed by press-forming to project inwardly from its inner surfaces at an upper and lower end portions of the tube plate 20 so that the second projecting portions 21 is over or on top and bottom end portions of the tank plate 9, restricting a relative movement between the tube plate 20 and the tank plate 9 in the longitudinal direction. The second projecting portions 21 has a half-cylinder shape, but their configurations are not limited to this half-cylinder.

In addition, inwardly projecting portions 8c of the tube plate 20 and openings 9a (only a first opening being illustrated in FIG. 10) receive one-side portions of the partition plates and their projections 10, respectively, restricting the relative movement between the tube plate 20 and the tank plate 9 in the longitudinal direction.

The right tank is constructed similarly to the left tank 1, and is arranged in directions opposite to each other. The other parts of the condenser of the second embodiment is similar to those of the first embodiment.

In this second embodiment, the second projecting portions 21, and the. inwardly projecting portions 8c and the openings 9a can be easily formed by press-forming. Therefore, this condenser can improve its productivity rate easily and at low manufacturing costs.

Next, a condenser of a third embodiment according to the present invention will be described with reference to the accompanying drawing.

Referring to FIG. 12, there is shown a part of a tank and a condenser core of the condenser of the third embodiment.

A tube plate 8 is formed on its inner surfaces with inwardly projecting portions 30 instead of the pairs of the inwardly projecting portions 8c of the first embodiment sandwiching the partition plates. The inwardly projecting portions 30 restrict the adjacent partition plates D2 and D3 (or D6 and D7) at facing sides of the adjacent partition plates. This structure of the inwardly projecting portions 30 is useful when many partition plates are fixed on the tube plate 8 and a tank plate 9, since the number of the inwardly projecting portions 30 can be decreased.

In this third embodiment, the inwardly projecting portions 30 and the openings 9a can be easily formed by press-forming. Therefore, this condenser can be constructed in a small dimensions and improve its productivity rate easily and at low manufacturing costs.

Next, a condenser of a fourth embodiment according to the present invention will be described with reference to the accompanying drawing.

As shown in FIG. 13, a tube plate 8 is formed on its inner surfaces with inwardly projecting portions 31 instead of the pairs of the inwardly projecting portions 8c of the first embodiment sandwiching the partition plates. The inwardly projecting portions 31 restrict the adjacent partition plates D2 and D3 (or D6 and D7) at outer sides of the adjacent partition plates. This structure of the inwardly projecting portions 31 is useful when many partition plates are fixed on the tube plate 8 and a tank plate 9, since the number of the inwardly projecting portions 31 can be decreased.

In the forth embodiment, the inwardly projecting portions 31 and the openings 9a can be easily formed by press-forming. Therefore, this condenser can be constructed in a small dimensions and improve its productivity rate easily and at low manufacturing costs.

While there have been particularly shown and described with reference to preferred embodiments thereof, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the invention.

The first projecting portions 8b, and the second projecting portion 21 may be set arbitrarily in their configurations, their setting positions and/or their numbers. In addition, they may be formed on the tank plate 9 instead of the tube plate 8.

The partition plates in the left and right tanks 1 and 2 may be set arbitrarily.

Although the heat changer is the condenser 100 in the embodiments, the heat exchanger may employ a radiator.

The entire contents of Japanese Patent Application No. 2005-292816 filed Oct. 5, 2005 are incorporated herein by reference.

Claims

1. A heat exchanger comprising:

a pair of tanks; and

a heat exchanger core arranged between the tanks and having a plurality of tubes and fins whose one end portions are fluidically connected with one of the tanks and the other end portions are fluidically connected with the other of the tanks, wherein

the tanks includes a tube plate connected with the tubes, a tank plate and at least two partition plates where the tube plate, the tank plate and the partition plates are integrally fixed by blazing after the tube plate and the tank plate are temporarily assembled with each other to temporarily fix the partition plates between the tube plate and the tank plate, wherein

at least one of the tube plate and the tank plate is formed to have a misalignment preventing portion for preventing misalignment in a longitudinal direction of the tube plate and the tank plate between the temporarily assembled tube plate and tank plate.

2. The heat exchanger according to claim 1, wherein

the misalignment preventing portion is a first projecting portion formed on an end portion of one of the tube plate and the tank plate by cutting off a part of the end portion, and the first projecting portion is bent at an axial outer side of an end portion of the other of the tube plate and the tank plate so that the first projecting portion is contactable with the end portion of the other of the tube plate and the tank plate.

3. The heat exchanger according to claim 1, wherein

the misalignment preventing portion is a second projecting portion formed on an end portion of one of the tube plate and the tank plate, and the second projecting portion is projected inwardly from an inner surface of the end portion at an axial outer side of an end portion of the other of the tube plate and the tank plate to be contactable with the end portion of the other of the tube plate and the tank plate.

4. The heat exchanger according to claim 1, wherein

the misalignment preventing portion is formed on the tube plate and the tank plate to form at least one of a projecting portion, a depression and an opening for fixing the partition plates so that a relative movement between the tube plate and the tank plate in the longitudinal direction can be restricted by the partition plates.