JPH1047888A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger, capable of properly setting a gap between the abutting ends of a header pipe manufactured by the rounding forming of a plate, and preventing a partitioning plate from falling off easily. SOLUTION: A heat exchanger is provided with a tubular header pipe 4 formed by rounding a unit plate, while a partitioning plate 7 is attached to the header pipe 4. In such a heat exchanger, a partitioning plate inserting hole 10 is provided at the connecting side of a flat tube and the abutting line of the rounded plate is provided at the opposite side of the header pipe 4. A notch, having a predetermined width in the diametral direction of the header pipe, is provided at a place on the abutting line opposed to the inserting hole of the partitioning plate while a projection 17 to be engaged with the notch and having a width wider than the notched part, is provided on the tip end of the inserting direction of the partitioning plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel flow type heat exchanger, and more particularly to a header pipe having improved brazing properties and assembling properties.

[0002]

2. Description of the Related Art Conventionally, a plurality of flat tubes are stacked in parallel, and both ends of each flat tube are connected to two header pipes to receive and send a heat exchange medium to a predetermined portion of the header pipe. It is configured with an entrance joint,
2. Description of the Related Art There is known a stacked heat exchanger in which a supplied heat exchange medium flows in a meandering manner between header pipes a plurality of times.

[0003] Further, such a heat exchanger is a precision instrument, and it is necessary to satisfy pressure resistance performance according to each use. For example, since a heat exchanger used as a capacitor is required to have high pressure resistance, it is necessary to sufficiently secure the joining property of each component by brazing or the like.

As shown in a schematic perspective view of FIG. 14, a header pipe used in this type of laminated heat exchanger is formed by rolling a single thin plate member (plate) from the viewpoint of ease of production and improvement of pressure resistance. What is molded and formed into a tube is generally used. That is, the header pipe 4 is manufactured by round molding using a single thin aluminum brazing sheet as a raw material. This rounding is performed by gradually rounding from both ends in the width direction by roller forming or the like. When the rounded both ends 13A, 13B in the width direction abut against each other, the ends 13A, 13B come into contact with each other. The long pipe-shaped header pipe 4 having the joints 14 is formed. A tube insertion hole 9 and a partition plate insertion hole 10 are formed at predetermined positions of the header pipe 4, and a partition plate 7 is inserted into the partition plate insertion hole 10. Is partitioned.

[0005] In such a header pipe, it is required to set an appropriate gap at the joint of the rounded members from the viewpoint of improving brazing properties.

That is, in this type of laminated heat exchanger, parts of each part are temporarily assembled in advance, and after this temporary assembly, a brazing flux or the like is sprayed from the outside to the whole, and the whole including the jig is subjected to an electric furnace. Etc., and are manufactured by brazing in a furnace. The direction in which the flux is sprayed on the heat exchanger is fixed to, for example, the direction of ventilation of the heat exchanger.

Therefore, as shown in FIG. 15A, when a gap cannot be set at the joint 14 of the header pipe 4, the brazing flux blown from the outside hardly penetrates into the inside. . For this reason, in the portion where the flux does not sufficiently penetrate, similarly, sufficient brazing is not performed, so that the pressure resistance as a whole is reduced.

Therefore, as shown in FIG. 15 (2), a gap of about 0.1 to 0.2 mm is provided at the joint 14 of the header pipe 4, and this gap allows the flux or the like to reach the inside of the joint. It is necessary to ensure that the brazing material is sufficiently penetrated.

As a method of providing a gap at the joint of the header pipes, a single plate is rounded and formed using a forming die, so that the width of the plate can be adjusted and the pre-stroke ( Height) can be adjusted.

[0010] Further, when assembling such a header pipe, it is important to prevent the partition plate from being displaced or falling off.

That is, since the partition plate is loosely fitted in the partition plate insertion hole, the partition plate is displaced from a predetermined position due to vibration or the like when the temporarily assembled heat exchanger is transferred to the brazing furnace. Or dropped from the header pipe.

As a method for preventing the partition plate from falling off, conventionally, for example, 1) one end of the partition plate is sandwiched and held between the end of a flat tube connected to the header pipe and the header pipe. 2) A partition plate is formed in a superposed shape of two members, and the leading ends in the insertion direction are joined to each other at a predetermined opening angle, and one of the members is formed. At the base end in the insertion direction, a protruding retaining portion that engages with the inner circumference of the header pipe is provided, and at the other proximal end, a protruding portion that contacts the insertion hole and presses the retaining portion is provided (for example, 5-14
No. 9689), and 3) Cut and raise both ends of the partition plate insertion hole to form a locking portion, and after mounting the partition plate, bend the locking portion so that the rear end of the partition plate in the insertion direction is bent. One that is locked and held (for example, Japanese Patent Application Laid-Open No. 5-172488) has been proposed.

The laminated heat exchanger using such a flat tube is manufactured by assembling respective parts and integrally brazing in a furnace. That is, fins are interposed between the flat tubes, both ends of the flat tubes are inserted into the tube insertion holes of the header pipe, assembled, fixed with a jig, and then integrally brazed in a furnace.

[0014]

However, in the above-mentioned conventional heat exchanger header pipe, the above-mentioned about 0.1%
It is extremely difficult to adjust the width of the plate or to adjust the pre-stroke of the above-described mold to form a gap of about 0.2 mm.

Further, in the above-described conventional method of temporarily fixing the partition plate, various inconveniences have occurred.

That is, according to the above 1), one end of the partition plate is sandwiched and held by the end of the flat tube and the header pipe, so that the position where the partition plate is mounted is limited. The flow of the medium flowing into the tube from the header pipe of the tube sandwiching the partition plate and flowing out from the tube to the header pipe may be hindered by the partition plate.

According to the above 2), the partition plate has a two-member superposed structure joined at the leading end in the insertion direction with a predetermined opening angle, and a retaining portion is provided at the base end of one of the members. In addition to the provision of a projection that presses the retaining portion at the base end of the other member, the shape and configuration of the partition plate are too complicated, and multiple steps are required to manufacture the partition plate alone, It is not suitable for mass production, and it is difficult to reduce costs.

Further, according to the above 3), the rear ends of the inserted partition plates in the insertion direction are locked and held by the locking portions formed by temporarily cutting and raising both ends of the partition plate insertion holes of the header pipe. The process and procedures become complicated,
Unsuitable for mass production and difficult to reduce cost.

Therefore, the present invention provides a heat exchanger in which the joint gap of a header pipe manufactured by rounding and forming a plate can be set appropriately and the partition plate can be easily prevented from falling off. It is intended to be.

[0020]

SUMMARY OF THE INVENTION The present invention provides a heat exchanger in which a single plate is rounded and formed into a tubular header pipe, and a partition plate is attached to the header pipe. A partition plate insertion hole is provided on the side, and a joint of the rounded plate is provided on the opposite side of the header pipe, and at a position facing the partition plate insertion hole of the joint, a predetermined width is provided in the header pipe radial direction. A heat exchanger having a notch, and a projection wider than the notch is provided at a leading end of the partition plate in the insertion direction.

Therefore, an appropriate gap can be reliably set at the joint of the header pipes, and the partition plate is prevented from falling off, so that the subsequent brazing step can be appropriately performed. That is, when the partition plate is assembled to the header pipe, the notch portion is widened by the protrusion of the partition plate, and an appropriate gap can be formed at a joint other than the notch portion. Flux and brazing material can penetrate sufficiently.

After assembly, the projection of the partition plate is
Since the partition plate is held between the header pipes, it is possible to reliably prevent the partition plate from falling off. That is,
The rear end of the partition plate in the insertion direction is held in the partition plate insertion hole, while the leading end of the partition plate is held by the cutout of the joint and is sandwiched at the same time. The stopper is prevented from falling off, and the partition plate can be reliably prevented from falling off.

Further, since a proper gap can be set at the joint of the header pipes by the projections of the partition plate, which is a component to be assembled to the header pipe, a process and an instrument for setting a dedicated gap are required. It becomes unnecessary, man-hours are reduced, costs can be reduced, and economic efficiency can be improved.

As a result, the header pipe can be brazed sufficiently and favorably, sufficient pressure resistance as the header pipe can be secured as designed, and the maximum flowable medium flow rate is maintained. The performance can be prevented from deteriorating, and, for example, the capacitor specification can be sufficiently satisfied in terms of withstand voltage.

Further, since the joint of the header pipe is located outside the heat exchanger, this portion can be visually recognized satisfactorily. It is possible to determine whether or not the partition plate is attached, and, for example, it is possible to prevent the partition plate from falling off or displacing. That is, by judging whether an appropriate gap is set at the joint of the header pipe or visually confirming that the projection of the partition plate is fitted in the cutout of the joint, the partition plate can be visually recognized. Can be easily determined whether or not is properly assembled.

Furthermore, since the partition plate insertion hole is provided inside the header pipe, the core pipe shrinks due to the melting of the brazing material during the brazing in the furnace, so that the header pipe closes this insertion hole. Bending to the center is prevented, and the shape of the heat exchanger can be prevented from being deformed abnormally, so that productivity can be improved. That is, since the outer portion of the header pipe, which is the outer part of the heat exchanger, is not provided with an insertion hole for weakening the strength, the header pipe may be bent due to contraction of the core portion due to melting of the brazing material during brazing. As a result, the shape of the heat exchanger can be maintained normally.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the laminated heat exchanger according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, in the laminated heat exchanger 1 of the present embodiment, a plurality of flat tubes 2 having the same length are laminated in parallel with each other via a thin plate-shaped corrugated fin 5. Both ends of the flat tube 2 are connected to the respective header pipes 3 and 4 for communication. In addition, each header pipe 3,
The upper and lower openings 4 are closed by blind caps 6, and at predetermined locations, an inlet joint 3a for taking in a heat exchange medium from the outside and an outlet joint 4a for discharging to the outside are connected and connected. The inside of each of the header pipes 3 and 4 is partitioned into a predetermined space by a partition plate 7, and the header plate 3 and 4 can be satisfactorily brazed by the partition plate 7 as described later.

In FIG. 1, reference numeral 8 denotes a frame-shaped side plate, which is disposed above and below the laminated flat tubes 2 with wavy fins 5 interposed therebetween. This side plate 8
Protects the wavy fins 5 and reinforces the structural strength of the heat exchanger 1.

Then, from the inlet joint 3a, the heat exchanger 1
The heat exchange medium taken in is meandered a plurality of times between the left and right header pipes 3 and 4 via the tube 2 and, when passing through the tube, performs heat exchange with the outside.
It is discharged from the entrance joint 4a. That is, the heat exchanger 1
The medium flowing into the heat exchanger 1 is meandered downward in the heat exchanger 1 and flows in units of a predetermined number of flat tube groups.

Each flat tube 2 is, as shown in FIG.
Using a thin aluminum material, the cross-sectional shape is formed into a flat elliptical shape having parallel flat portions, and is set to predetermined height and width dimensions that are optimal for the heat exchange efficiency of the medium flowing inside. ing. The lengths of the flat tubes 2 in the longitudinal direction are respectively formed to have the same predetermined length, and a plurality of beads 11 protruding in the tube direction are provided integrally along the longitudinal direction. The beads 11 form a plurality of medium flow paths 12, 12 in the tube tube.

These beads 11 are provided at predetermined positions in the width direction of the flat tube 2 alternately in the tube inward direction from the inner surface of the flat tube 2, and are provided in a total of four rows. Four flow paths 12, 12 having substantially equal cross-sectional areas are formed. These beads 11
Of the flat tube 2 is set substantially equal to the height of the flat tube 2 inside the tube, and the portion of the flat tube 2 facing these beads 11 is formed in an unprocessed flat surface. Therefore, the inner surface of the flat tube 2 facing the top of each bead 11 is joined, and
A plurality of flow paths 12, 12 are formed.

Each of these beads 11 is not formed over the entire length of the flat tube 2 and has an end portion 11a continuous with the tube flat portion in the vicinity of joining with the header pipes 3, 4. I have. That is, the outer shape near the ends of the tube inserted into the header pipes 3 and 4 is formed on a flat surface, and the inside near the same is similarly formed flat,
It has a single flow path.

Both ends of each flat tube 2 are inserted into each tube insertion hole 9 provided in the header pipe 4 as shown in FIGS. Although illustration is omitted,
The other header pipe 3 has a similar configuration.

Both ends of the flat tube 2 are inserted into the tube insertion holes 9 of the header pipe 4 formed in accordance with the outer shape of the cross section of the flat tube 2 and brazed to join. Both end portions are formed on a flat surface where no bead 11 is provided, so as to maintain the airtightness of this joint portion.

The tube insertion portion having a flat outer shape is formed by pushing back a bead 11 formed in advance over the entire length in the longitudinal direction of the tube 2 into a flat shape by plastic deformation using a press machine or the like. . Therefore, even if a number of beads 11 are provided on the flat tube 2, the joining between the header pipe 4 and the flat tube 2 is performed on such a flat portion of the flat tube 2, so that brazing can be performed reliably and well. Will be

The dimension of the flat tube flat portion in the longitudinal direction of the tube absorbs an assembling error and, as will be described later, when the burring 9a is formed in the insertion hole 9 of the header pipe 4, for example. In order to make the holding and joining effects by the burring 9a effective, about 5 mm is preferable.

Each of these header pipes 3 and 4 is made of a single thin aluminum brazing sheet as a raw material, and is formed into a long pipe having a circular cross section having a predetermined inner and outer diameter by rounding. It is formed, erected and arranged. This brazing sheet has good thermal conductivity, moldability and brazing properties, and is used as a raw material of the flat tube 2 described above. And
This brazing sheet is formed in a long plate shape of a predetermined size,
Next, rounding is performed. In other words, the round forming is performed by gradually rounding from both ends in the width direction by roller forming or the like.
When A and 13B meet, both end edges 13A and 13A
The long pipe-shaped header pipes 3 and 4 are formed with the abutment portion 13B at the joint 14.

In this embodiment, the joints 14 of the header pipes 3 and 4 manufactured by rounding in this manner are used.
Is set to be located outside the assembled heat exchanger 1.

Joint 1 of these tubular header pipes 3 and 4
A plurality of tube insertion holes 9 for connecting the above-mentioned flat tubes 2 are provided on the opposite side of the tube 4. These tube insertion holes 9 are formed at predetermined intervals in the longitudinal direction of the pipes 3 and 4, and are opened in a shape slightly larger than the outer shape of the cross section of the tube described above. Therefore, each flat tube 2 can be easily inserted into the corresponding tube insertion hole 9 of the header pipes 3 and 4, and can be temporarily assembled, and can be satisfactorily brazed and joined by the subsequent steps.

Each of the tube insertion holes 9 of the header pipes 3 and 4 has a burring 9a protruding along the longitudinal direction of the flat tube 2 mounted in the header pipe.
Are formed integrally, and by this burring 9a,
The flat tube 2 can be easily inserted, and a large joint area with the flat tube 2 is ensured so that brazing can be performed reliably.

Further, partition plates 7 are provided at predetermined positions of the header pipes 3 and 4. The partition plates 7 partition the inside of the header pipes 3 and 4 into a predetermined space, and form header headers 3 and 4. , 4 at a predetermined gap. Each header pipe 3, 4
Inside the tube insertion hole 9, a partition plate insertion hole 10 having a predetermined shape is provided so as to penetrate therethrough.

Therefore, the partition plate 7 is inserted into the partition plate insertion hole 10.
Is inserted and brazed so as to partition the inside of the header pipe 3 into a predetermined space between the tube insertion holes 9. That is, the section in the header pipe 3 divided by the partition plate 7 is the header pipe 3,
4, the number of flat tubes 2 communicating with each section is sequentially reduced. Accordingly, the medium in the initial state having a large temperature difference with the outside passes through a large number of flat tubes 2, and the medium whose temperature difference has been reduced by heat exchange passes through a relatively small number of flat tubes 2. The heat exchanger can be heat-exchanged, and the volume of the heat exchanger, that is, the outer shape can be made compact.

The partition plate insertion hole 10 is opened in a substantially rectangular shape over about 1/3 in the radial direction of the header pipe, and the height of this opening is set slightly higher than the plate thickness of a partition plate 7 described later. Thus, the partition plate 7 can be easily inserted.

The partition plate insertion hole 1 of the joint 14
At a location facing 0, a notch 16 is provided for optimally setting a gap between joints 14 by a projection of a partition plate 7 described later.

That is, the notch 16 is opened in a substantially rectangular shape in the tube radial direction at the joint 14 corresponding to the position where the partition plate insertion hole 10 is provided in the longitudinal direction of the header pipe. It has the same opening height as 10 and a predetermined opening width.

Further, the upper and lower openings of these header pipes 3 and 4 are closed by blind caps 6, and an inlet joint 3 a is provided above one header pipe 3 and below the other header pipe 4. Has an outlet joint 4a attached. The heat exchanger 1 is connected to external devices and the like via pipes via the inlet / outlet joints 3a and 4a, and a heat exchange medium is circulated between these devices.

As shown in FIGS. 5 (1) to 5 (3), the partition plate 7 is made of a thin aluminum material and has a cross section in the vicinity of the partition plate insertion hole 10 of the header pipes 3 and 4. A large-diameter portion having the same radius as the outer diameter of the header pipe corresponding to the partition plate insertion hole 10 described above, and a small-diameter portion having the same radius as the inner diameter of the header pipe. Have been. Therefore, after the partition plate 7 is inserted into the partition plate insertion hole 10, the cross section of the header pipes 3, 4 in the vicinity is closed by the partition plate 7, and the inside of the header pipes 3, 4 can be partitioned by the partition plate 7. Like that.

The partition plate 7 is provided with a projection 17 having a predetermined width so as to protrude integrally therewith. When the partition plate 7 is assembled to the header pipes 3 and 4 by the projection 17, At the joint 14 between the header pipes 3 and 4, a gap 15 having a predetermined width that is optimal for brazing can be set.

That is, the projections 17 are provided integrally with the notches 16 of the header pipes 3 and 4 at the tips in the insertion direction, corresponding to the notches 16 of the header pipes 3 and 4. It comprises a base portion 17a to be engaged and a guide portion 17b provided at a tip end of the base portion 17a.

The base 17a of the projection 17 is at least larger than the thickness of the header pipes 3 and 4 and protrudes along the direction in which the partition plate 7 is inserted.
6.

As shown in FIG. 6, the width of the base 17a is smaller than the width a of the notch 16 previously provided at the joint 14 of the header pipes 3 and 4, for example, by about 0.1. The dimension b is set to be larger by an optimum gap for brazing of about 0.2 mm.

5 (1) to 5 (3), a tapered guide portion 17b is provided at the tip of the base 17a of the projection 17 so as to extend in the insertion direction. The notch 1 is formed by the guide portion 17b.
The protrusion 17 can be easily inserted into the base 6 up to the base end.

Therefore, as shown in FIGS. 7A and 7B, before such a partition plate 7 is assembled to the header pipes 3 and 4, the joint 14 of the header pipes 3 and 4 is
The contact is made over the entire length in the longitudinal direction. Then, after the partition plate 7 is assembled at a predetermined position, FIG.
As shown in (3) to (5) and FIG. 8, a gap 15 having a predetermined width optimal for brazing can be secured at the joint 14 by the base 17a of the projection 17 of the partition plate 7, The header pipes 3 and 4 can be satisfactorily brazed.

After the main parts of the heat exchanger 1 have been temporarily assembled in this way, the gap 15 at the joint is exposed outside the heat exchanger, so that the gap 15 is secured. Or the notch 16 of the joint 14
In addition, whether or not the projection 17 of the partition plate 7 is fitted, that is, whether or not the partition plate 7 is properly mounted, can be easily visually confirmed to thereby confirm that assembling defects are reduced. Can be.

Further, since the projection 17 is held between the header pipes, it is possible to prevent the partition plate from falling off. That is, the rear end of the partition plate 7 in the insertion direction is held in the partition plate insertion hole 10, while the projection 17 at the front end of the partition plate 7 is held by the notch 16 of the joint 14. Since the partition plate 7 is sandwiched, the partition plate 7 is prevented from coming off, and the partition plate 7 can be reliably prevented from falling off.

Further, after being assembled as a heat exchanger in this way, the partition plate insertion hole 10 is located inside the heat exchanger, thereby preventing core deformation of the heat exchanger during integral brazing in a furnace. can do.

Regarding this point, when the partition plate insertion holes 10 of the header pipes 3 and 4 are provided outside in the heat exchanger as in the conventional example shown in FIG. Sometimes, the lowermost flat tube is fixed by the temporary assembling jig G, so that the header pipes 3 and 4 are bent as shown in FIG. May be distorted. This is because the brazing material melts during the heating in the furnace, so that the heat exchanger 1
This is due to the core portion shrinking and the partition plate insertion hole 10 being provided outside the header pipes 3 and 4, and the strength of this portion is reduced. As a fulcrum, the header pipes 3 and 4 may be deformed into a bulging shape, and in some cases, the header pipes 3 and 4 may be bent and the heat exchanger 1 may be damaged.

However, since the partition plate insertion holes 10 for the header pipes 3 and 4 are provided inside the heat exchanger 1, a decrease in the strength of the outer surfaces of the header pipes 3 and 4 is avoided. The core deformation during brazing can be prevented, and the yield rate can be improved.

In the above-described specific example, the header pipe is applied to a circular pipe having a circular cross section. However, the present invention is not limited to this. The header pipe may be applied to an elliptical pipe or a pipe having a different cross section. .

In this embodiment, the notch provided at the joint of the header pipe is formed in a symmetrical shape with a substantially rectangular opening having the same width around the joint. However, the present invention is not limited to this. It may be formed in an asymmetric shape having different widths or formed only on one side, and correspondingly, the shape of the projection provided on the partition plate may be formed.

As described above, according to the heat exchanger of the present embodiment, in the header pipe in which a partition plate is attached to the pipe-shaped header pipe obtained by rounding and forming a single plate to partition the inside into a predetermined space, A partition plate insertion hole is provided on the flat tube connection side of the header pipe, a joint is provided on the opposite side, and a notch having a predetermined width in the header pipe radial direction is provided at a position facing the partition plate insertion hole of the joint. In addition, by providing a projection wider than the notch at the end of the partition plate in the insertion direction, an appropriate gap can be reliably set at the joint of the header pipe, and the separation of the partition plate Therefore, the subsequent brazing step can be appropriately performed.

That is, when the partition plate is assembled to the header pipe, the notch is widened by the protrusion of the partition plate, and an appropriate gap can be formed at a joint other than the notch. The flux and brazing material can penetrate uniformly and sufficiently inside.

After assembly, the projections of the partition plate
Since the partition plate is held between the header pipes, it is possible to reliably prevent the partition plate from falling off. That is,
The rear end of the partition plate in the insertion direction is held in the partition plate insertion hole, while the leading end of the partition plate is held by the cutout of the joint and is sandwiched at the same time. The stopper is prevented from falling off, and the partition plate can be reliably prevented from falling off.

Further, since a proper gap can be set at the joint of the header pipes by the projections of the partition plate, which is a component to be assembled to the header pipe, a process and an instrument for setting a dedicated gap are required. It becomes unnecessary, man-hours are reduced, costs can be reduced, and economic efficiency can be improved.

As a result, the header pipe can be brazed sufficiently and well, the sufficient pressure resistance as the header pipe can be ensured as designed, and the maximum medium flow rate that can flow can be maintained. The performance can be prevented from deteriorating, and, for example, the capacitor specification can be sufficiently satisfied in terms of withstand voltage.

Further, since the joint of the header pipe is located outside the heat exchanger, this portion can be visually recognized well, so that it is possible to easily confirm it at the time of assembling. It is possible to determine whether or not the partition plate is attached, and, for example, it is possible to prevent the partition plate from falling off or being displaced. That is, by judging whether an appropriate gap is set at the joint of the header pipe or visually confirming that the projection of the partition plate is fitted in the cutout of the joint, the partition plate can be visually recognized. Can be easily determined whether or not is properly assembled.

Furthermore, since the partition plate insertion hole is provided inside the header pipe, the core pipe shrinks due to the melting of the brazing material during the brazing in the furnace, so that the header pipe closes the vicinity of the insertion hole. Bending to the center is prevented, and the shape of the heat exchanger can be prevented from being deformed abnormally, so that productivity can be improved. That is, since the outer portion of the header pipe, which is the outer part of the heat exchanger, is not provided with an insertion hole for weakening the strength, the header pipe may be bent due to contraction of the core portion due to melting of the brazing material during brazing. As a result, the shape of the heat exchanger can be maintained normally.

Next, the heat exchanger of the present invention will be described based on a second specific example shown in FIGS. The heat exchanger of this example is designed to further prevent the partition plate from falling off.

In the present example and each of the examples described later, the configuration and dimensions of the heat exchangers other than the partition plate are the same, so that the description thereof will be omitted.

In FIG. 10, the partition plate 7 of this embodiment is different from the above-described embodiment in that the base 18a of the projection 18 is formed in an inversely tapered shape with respect to the guide portion 18b at the tip end, that is, in the shape of a widening. And is provided as a retaining base 18a.

Therefore, as shown in FIG. 11, once the partition plate 7 has been assembled to the header pipes 3 and 4, not only the projections 18 of the partition plate 7 are clamped but also the header pipes 3 and 4. Unless the joint 14, that is, the notch 16 is slightly widened, the retaining base 18 a of the projection 18 cannot be pulled out from the notch 16, so that the partition plate 7 cannot be removed. As a result, it is possible to more reliably prevent the partition plate 7 from falling off before the brazing step is completed.

As described above, according to the heat exchanger of this embodiment, not only the same effects as those of the first embodiment are obtained, but also the bases of the protrusions engaging with the cutouts of the header pipes 3 and 4. Is formed in the shape of a widening, so that the prevention of detachment can be strengthened, so that the separation of the partition plate after the partition plate has been assembled can be more reliably prevented.

Further, the heat exchanger of the present invention will be described based on a third specific example shown in FIGS. The heat exchanger of this embodiment is designed to further prevent the partition plate from falling off, similarly to the second specific example.

That is, as shown in FIG. 12, the partition plate 7 of the present embodiment is different from the above-described embodiment in that the base 1 of the projection 19 is provided.
9a, at the tip end, a retaining portion 1 formed in a divergent shape
9c, and a tapered tapered guide portion 19b is integrally provided at the tip of the retaining portion 19c.

Therefore, as shown in FIG. 13, once the partition plate 7 is assembled to the header pipes 3 and 4, the joint 10 of the header pipes 3 and 4, ie, the joint 1
If the width of the notch 16 of 0 is not widened to the width of the retaining portion 19c, the engaged state of both will not be released and the partition plate 7 cannot be removed. As a result, it is possible to more reliably prevent the partition plate 7 from falling off before the brazing step is completed.

It should be noted that the present example and the second specific example may be implemented at the same time to further prevent falling off.

As described above, according to the heat exchanger of this embodiment, not only the same effects as those of the first embodiment can be obtained, but also the front end side of the protruding base engaging with the notch of the header pipe. By providing the retaining portion formed in the shape of the divergent shape, the prevention of removal can be strengthened, so that the partition plate can be more reliably prevented from falling off after the partition plate has been assembled.

Further, since the projection of the partition plate exposed to the outside from the cutout of the header pipe, ie, the retaining portion of the projection, is larger than that of the above-described specific example, the visual confirmation can be made more easily. Can be improved.

[0080]

As described above, the present invention relates to a heat exchanger in which a single plate is rounded and formed to provide a tubular header pipe, and a partition plate is attached to the header pipe. A partition plate insertion hole is provided on the flat tube connection side of the header pipe, a joint of the rounded plate is provided on the opposite side of the header pipe, and a header pipe diameter is provided at a position facing the partition plate insertion hole of the joint. A heat exchanger having a configuration in which a notch having a predetermined width in a direction is provided, and a protrusion wider than the notch is provided at a leading end of the partition plate in the insertion direction.

Accordingly, an appropriate gap can be reliably set at the joint of the header pipes, and the partition plate is prevented from falling off, so that the subsequent brazing step can be appropriately performed.

After the assembly, the projection of the partition plate
Since the partition plate is held between the header pipes, it is possible to reliably prevent the partition plate from falling off.

Further, since a proper gap can be set at the joint of the header pipes by the projection of the partition plate, which is a component to be assembled to the header pipe, a process and an instrument for setting a dedicated gap are required. It becomes unnecessary, man-hours are reduced, costs can be reduced, and economic efficiency can be improved.

As a result, the header pipe can be brazed sufficiently and satisfactorily, sufficient pressure resistance as the header pipe can be secured as designed, and the maximum medium flow rate that can flow is maintained. The performance can be prevented from deteriorating, and, for example, the capacitor specification can be sufficiently satisfied in terms of withstand voltage.

Further, since the joint of the header pipe is located outside the heat exchanger, this portion can be visually recognized satisfactorily. It is possible to determine whether or not the partition plate is attached, and, for example, it is possible to prevent the partition plate from falling off or being displaced.

Further, since the partition plate insertion hole is provided inside the header pipe, the core pipe shrinks due to the melting of the brazing material during the brazing in the furnace, so that the header pipe is formed.
The bending around the vicinity of the insertion hole is prevented, the shape of the heat exchanger can be prevented from being deformed in an irregular shape, and the productivity can be improved.

As described above, according to the present invention, the gap between the joints of the header pipes manufactured by rounding and forming the plate can be set appropriately, and the partition plate can be easily prevented from falling off. You can get a bowl.

[Brief description of the drawings]

FIG. 1 is a front view of a stacked heat exchanger according to a first example of the present invention.

FIG. 2 is a cross-sectional view showing a main configuration of the flat tube for a heat exchanger of the present embodiment.

FIG. 3 is a partially omitted plan view showing a joint portion between a flat tube and a header pipe according to the present embodiment.

FIG. 4 is a partially omitted longitudinal sectional view showing a joint portion between a flat tube and a header pipe according to the present embodiment.

FIG. 5 is a plan view of the partition plate of the present example, (1) is a plan view of the partition plate, (2) is a side view thereof, and (3) is a front view thereof.

FIG. 6 relates to a partition plate of the present example, and a protrusion width dimension of the partition plate;
It is explanatory drawing which shows the relationship of the notch width size of a header pipe.

7A and 7B are plan sectional views of a header pipe before assembly of a partition plate, and FIG. 7B is a view of FIG.
The cross-sectional view taken along the line ii-ii in the middle, (3) is a plan cross-sectional view of the header pipe showing the state after the partition plate has been assembled, and (4) is the figure (3)
FIG. 3C is a cross-sectional view taken along the line iiii-iiii, and FIG.

FIG. 8 is a schematic perspective view of the header pipe showing a state after the partition plate is assembled.

FIG. 9 relates to a conventional heat exchanger, (1) is a front view showing a state temporarily assembled using a fixing jig, and (2) shows a state deformed by integral brazing in a furnace. It is a front view.

FIG. 10 relates to a second specific example of the present invention, wherein (1) is a plan view of a partition plate, (2) is a side view thereof, and (3) is a front view thereof.

11 (1) is a plan sectional view of the header pipe after the partition plate is assembled, and FIG. 11 (2) is FIG. 11 (1).
It is a ii-ii arrow line view in the inside.

FIG. 12 relates to a third specific example of the present invention, wherein (1) is a plan view of a partition plate, (2) is a side view thereof, and (3) is a front view thereof.

FIG. 13 is a cross-sectional plan view of the header pipe showing a state after the partition plate is assembled, and FIG.
It is a ii-ii arrow line view in the inside.

FIG. 14 is a schematic perspective view of a header pipe according to a conventional example.

FIG. 15 relates to a conventional example, and (1) is a cross-sectional plan view of the header pipe showing a state where the joint of the header pipe is in contact;
FIG. 2B is a plan cross-sectional view of the header pipe showing a state where a gap is set at the joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stacked heat exchanger 2 Flat tube 2a Joint of flat tube members 3 Inlet header pipe 3a Inlet joint 4 Outlet header pipe 4a Outlet joint 5 Wavy fin 6 Blind cap 7 Partition plate 8 Side plate 9 Tube insertion hole 9a Burring REFERENCE SIGNS LIST 10 Partition plate insertion hole 11 Long bead 11 a Long bead end portion 12 Divided flow path in tube 13 A, 13 B Both end edges in width direction of header pipe 14 Joint 15 Brazing gap 16 Notch for setting gap of header pipe joint Reference Signs List 17 Projection part of partition plate 17a Base part of projection part 17b Tapered tapered guide part of projection part 18 Projection part of partition plate 18a Retaining base part of tapered shape of tapered part of projection part 18b Tapered tapered guide part of projection part 19 Partition plate The projection 19a The base 19b of the projection 19b The tapered guide portion 19c of the projection 19c Tapered shape retaining part G Temporary assembly fixing jig

Claims (2)

[Claims] 1. A heat exchanger in which a single plate is rounded and formed to provide a tubular header pipe, and a partition plate is mounted on the header pipe, wherein a partition plate insertion hole is provided on the flat tube connection side of the header pipe. Along with a joint of a rounded plate provided on the opposite side of the header pipe, a cutout having a predetermined width in a header pipe radial direction is provided at a position facing the partition plate insertion hole of the joint, and the partition plate is provided. A heat exchanger characterized in that a protrusion wider than the notch is provided at the front end in the insertion direction. 2. The heat exchanger according to claim 1, wherein a protrusion is formed at the protrusion of the partition plate or at a tip of the protrusion to prevent the stopper from falling off.