JPH01174898A - Tube for heat exchanger - Google Patents

Abstract

PURPOSE:To endure deformation, stabilize the surface which comes in contact with fins and plan the improvement of heat transfer efficiency by having a column part composed of a center joint part in the center part of a width direction and making its cross section in convex lens shape in regard to tubes for a heat exchanger. CONSTITUTION:A circumferential joint part 11 circling the circumference of a first plate is projected in the direction of nearing the side of a second plate 2, mutually joined with the circumferential joint part of the second plate 2 and passages 3, 4 are formed while both side ends of a tube are formed. A center joint part 12 is projected in the direction of nearing the side of the second plate 2, mutually joined with the center joint part of the second plate 2 and formed higher than the circumferential joint part 11. The center joint part 12 is continued in the longitudinal direction of the first plate 1. Therefore, since a tube formed by joining the first plate 1 with the second plate 2 has a high column part composed of the center joint part 12 at the center in the direction of width and its cross section is in convex lens shape, the contact with the fins is stabilized and heat transfer efficiency is good.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to tubes for heat exchangers.

The duplex for a heat exchanger of the present invention includes a radiator used for engine cooling, an evaporator used for various types of air conditioning,
It can be used in the core of heat exchangers such as heater cores used in various types of heating.

[Prior Art] Conventionally, a Dron cup-shaped core portion is known in which tubes and fins formed by joining two plates are alternately layered 1a. Each of the plates used here is in the form of an elongated strip, and has peripheral protrusions adjacent to each other at both ends thereof, and a central protrusion at the center thereof having the same height as the peripheral protrusions. The peripheral protrusions and central protrusions of the two plates are joined together to form a fluid passage inside.

In addition, in patent application publication No. 59-500877,
A radiator tube is disclosed in which a thin strip plate is folded in the longitudinal direction to form a tubular shape, both ends are soldered to each other, and the cross section is formed into an elongated convex lens shape. The surface of this tube that contacts the fins is arcuate, making it easier for the tube and fins to come into contact with each other to improve thermal efficiency.

[Problems to be Solved by the Invention] In the conventional tube formed by joining two plates, the surface to be joined to the fin is a horizontal flat surface, and the center does not protrude like a convex lens. For this reason, defects tend to occur in the joint between the tube and the fin, and gaps are likely to occur.

Further, the radiator tube, which is formed by bending the band-shaped plate and has a convex lens cross section, does not have a pillar part in the center portion in the width direction to prevent deformation, so it is easily deformed and the contact with the fins is unstable.

The present invention was made to solve these problems, and an object of the present invention is to provide a tube for a heat exchanger that is resistant to deformation, has stable contact with fins, and has high thermal efficiency.

[Means for Solving the Problems] The heat exchanger tube of the present invention includes a first band-shaped plate, and a second band-shaped plate integrally joined to the first plate to form a fluid passage therein. The tube for a heat exchanger forms a core part of the heat exchanger together with the fins, and the first plate and the second plate each protrude at both ends thereof in a direction approaching the other side and are mutually connected to each other. The first plate and the second plate each have peripheral joints joined to form opposite ends of the tube and the passageway for fluid, and each of the first plate and the second plate has peripheral joints formed in a widthwise center thereof in a direction toward each other. It is characterized by having a central joint part that is protruding and joined to each other and is higher than the peripheral joint parts.

The tube for a heat exchanger of the present invention has a columnar portion consisting of a central joint portion in the center portion in the width direction, and the cross section thereof has a convex lens shape. Therefore, this tube is resistant to deformation, has a stable surface in contact with the fins, and has excellent heat transfer efficiency.

Moreover, by making the central joint part of the heat exchanger tube of the present invention continuous in the longitudinal direction, mutually independent passages can be formed on both sides of the central joint part. In this case, the upper ends of each passage of the tube may be joined to the fluid introduction pipe and the fluid outlet pipe, respectively, and the passages may be made continuous without providing a central joint at the lower end of the tube.

Moreover, the central joint part can also be made into a plurality of joint protrusions connected in the longitudinal direction. In this case, one passage is formed in the tube.

In the tube for a heat exchanger of the present invention, the first plate and the second plate are connected in the longitudinal direction between the peripheral joint part and the central joint part, and are joined to each other so as to protrude in a direction toward the other side. The second joint may be higher than the peripheral joint and the same height as or lower than the central joint. This second joint makes the joint of each plate stronger.

Further, in the heat exchanger tube of the present invention, the first plate and the second plate each have a low protrusion that protrudes in a direction toward the other side, in addition to the peripheral joint, the central joint, and the second joint. You can have it. This protrusion creates turbulence in the fluid passing through the passage to increase heat transfer in the fluid, and increases the area in contact with the fluid to improve thermal efficiency.

The peripheral joint, the central joint, the second joint, and the protrusion are each indentations when viewed from the outside after the tube is formed. Assuming that the height of these peripheral joints is hl, the height of the central joint is h2, the height of the second joint is h3, and the height of the protrusion is h4, the following relationship is obtained.

h4<hl<h3≦h2 [Function] The tube for a heat exchanger of the present invention has a columnar portion consisting of a central joint portion in the center portion in the width direction, and the cross section thereof has a convex lens shape. Therefore, since this tube has a convex lens-shaped cross section that is supported by the column and is difficult to deform, contact with the fins is stable and heat transfer efficiency is high.

[First Example] As shown in FIG. 1, which is a partial perspective view of the core portion, the heat exchanger tube of this example includes a first plate 1 in the shape of an elongated strip, and is integrally joined to the first plate 1. The second plate 2 is in the form of an elongated strip and forms a hot water passage 3.4 therein, and together with the fins 5 forms the core part of the heater core.

The first plate 1, as shown in the plan view in FIG. 2, is stamped and press-molded into a single-letter shape. The second plate 2 also has the same shape as the first plate 1.

The first plate 1 has a peripheral joint 11 that goes around the circumference, one central joint 12 at the center in the width direction, and a plurality of joints between the peripheral joint 11 and the central joint 12. Second
It has a joint portion 13 and a plurality of protrusions 14 .

The peripheral joints 11 protrude in a direction proximate to the second plate 2 and are mutually joined to peripheral joints (not shown) of the second plate 2, forming both ends of the tube and connecting the passages 3.4. form.

It is effective for the height of this peripheral joint portion 11 to be 1.0 to 1.5 (mm>) in terms of thermal efficiency.

The central joint portion 12 protrudes in a direction approaching the second plate 2 and is joined to a central joint portion (not shown) of the second plate 2 . Further, the central joint portion 12 is formed higher than the peripheral joint portion 11 by approximately 0.05 (n+n+). Further, the central joint portion 12 is continuous in the longitudinal direction of the first plate 1. Therefore, the tube formed by joining the first plate 1 and the second plate 2 has a high pillar part formed by the central joining part 12 at the center in the width direction, and its cross section has a convex lens shape. Note that the central joint portion 12 is continuous with the peripheral joint portion 11 at the upper end, and is separated from the peripheral joint portion 11 at a predetermined interval at the lower end. The tube is thus formed with said passages 3.4 on both sides of the central joint 12, which are independent of each other and communicate at their lower ends.

The second joint portion 13 protrudes in a direction approaching the second plate 2 and is joined to a second joint portion (not shown) of the second plate 2 . Further, the second joint portion 13 is formed higher than the peripheral joint portion 11 and at the same height as the central joint portion 12 . The second joints 13 are formed in the shape of 16 protrusions in total, with eight second joints 13 arranged at equal intervals in the longitudinal direction on the left and right sides of the central joint 12.

These second joints 13 therefore make the joint of each plate 1.2 even stronger.

The protruding portion 14 protrudes in a direction approaching the second plate 2 side. Further, the protrusions 14 face each protrusion (not shown) of the second plate 2, and are formed lower than the peripheral joint portion 11. These protrusions 14 are provided with steps alternately between the second joint part 13 on the left and right sides of the central joint part 12, and are arranged in six pieces at a time (four at the lower end and two at the lower end).
Share items between left and right. ), a total of 82 pieces are formed. Each of the protrusions 14 is formed into a horizontally elongated ellipse except for the two at the lower end, and the two at the lower end are formed into an ellipse that rises diagonally to the right. These protrusions 14 are therefore connected to the passageway 3.
Turbulent flow is generated in the hot water passing through 4 to increase heat transfer of the hot water, and the area in contact with the hot water is increased to improve thermal efficiency.

J3, the upper end of the first plate 1 has a hot water introduction hole 3a,
'fa water conduction hole 4b section is formed.

The first plate 1 and the second plate 2 were formed by pressing aluminum alloy plates having a predetermined shape using basically the same pressing method as the conventional method.

Next, a process for forming a heater core using each of these plates 1.2 will be outlined. Note that this molding process is basically the same as that for the conventional laminated type. First, prepare each plate 1.2 described above and a plurality of pleated aluminum alloy fins 5 manufactured in other steps, and also install a drought water introduction pipe (not shown) and a hot water outlet pipe (not shown). prepare.

Then, the fins 5, the first plate 1 made of aluminum clad material, the second plate 2, and the fins 5 are laminated in this order. Here, the first plate 1 and the second plate 2 are 8! so that each joint part etc. faces each other. layer. In this way, a tube and a tank portion are simultaneously formed by each first plate 1 and second plate 2.

In addition, in this lamination step, the second plate 2, the fins 5, and the first plate 1 may be laminated one by one as a unit. Finally, connect the hot water inlet pipe and hot water outlet pipe to the drought introduction 7t3a at the upper end of the tube, and the I water damage outlet 4.
Connect to b. In this way, the heater core can be manufactured. Note that the joining method may be electric welding, pressure welding, etc. in addition to aluminum brazing. Since the bulge of this embodiment has a convex lens-shaped cross section that is supported by the column and is difficult to deform, it can easily receive pressing force appropriately during core molding and can be more easily joined to the fins 5. Therefore, this tube has stable contact with the fins 5 and has excellent heat transfer efficiency.

Note that the function of this heater core will be explained. First, hot water is supplied from the hot water introduction pipe. This hot water passes through the passage 3 from the hot water inlet hole 3a at the upper end of the tube, further passes around the lower end, passes through the passage 4, passes through the hot water outlet hole 4b at the upper end, and is discharged from the hot water outlet pipe. During this time, the heat of the hot water is transferred to the air through the fins 5 in contact with the tube, and heat exchange takes place.

[Second Embodiment] As shown in the partial perspective view of the core portion in FIG. 3, the heat exchanger tube of this embodiment includes a first plate 6 in the shape of an elongated strip, and
It consists of a long strip-shaped second plate 7 which is integrally joined to the first plate 6 and forms a hot water passage 8 therein, and together with the fins 9 forms the core part of the heater core.

The first plate 6 is stamped and press-formed into a single character shape, as shown in the plan view of FIG. The second plate 7 also has the same shape as the first plate 6.

The first plate 6 includes a peripheral joint portion 61 that goes around the periphery, and a plurality of joint protrusions 62 at the center in the width direction.
A plurality of protrusions 63 are provided between the peripheral joint part 61 and the joint protrusion 62.

The peripheral joint portion 61 is similar to that of the first embodiment.

The joint protrusion 62 protrudes in a direction approaching the second plate 7 and is joined to a joint protrusion (not shown) of the second plate 7 . Further, the joint protrusion 62 is formed higher than the peripheral joint part 61 by about 0.05 (mm). These joining protrusions 62 are arranged 8 times in the longitudinal direction of the first plate 6.
They are individual.

Therefore, the tube formed by joining the first plate 6 and the second plate 7 has one passage 8 formed therein, and has a high column part consisting of a joint protrusion 62 at the center in the width direction. The cross section has a convex lens shape.

The protrusions 63 are similar to those in the first embodiment, but are formed in a larger number. These protrusions 63 are provided with steps alternately on the left and right sides of the joining protrusion 62, and 55 protrusions are provided each.
A total of 117 joint protrusions are formed, one between each joint protrusion 62. Each of the protrusions 63 is formed in a horizontally elongated ellipse shape, except for the seven protrusions between the joint protrusions 62, and the seven protrusions between the joint protrusions 62 are formed in an elliptical shape that rises diagonally in an alternating manner.

Note that a hot water introduction hole 8a is partially formed at the upper end of the first plate 6, and a hot water outlet hole 8b is formed at the lower end of the first plate 6.
A part of it is formed.

The molding of each plate 6.7 and the heater core is the same as in the first embodiment. The tube of this embodiment also has a convex lens-shaped cross section that is supported by the pillars and is difficult to deform, so it can easily receive pressing force appropriately during core molding and can be more easily joined to the fins 9. Therefore, this tube also has stable contact with the fins 9 and has excellent heat transfer efficiency.

The operation of the heater core of this embodiment will also be explained. First, hot water is supplied from a hot water introduction pipe (not shown).

This hot water passes through a passage 8 from a hot water introduction hole 8a at the upper end of the tube, passes through a hot water outlet hole 8b at the lower end, and is discharged from a hot water outlet pipe (not shown). During this time, the heat of the hot water is transferred to the air through the fins 9 in contact with the tube, and heat exchange takes place.

In addition, in the embodiment, each plate etc. was formed using an aluminum alloy plate, but a copper plate, a steel plate, etc. can also be used if desired. Further, it may be formed into an evaporator, radiator, etc.

[Effects of the Invention] The tube for a heat exchanger of the present invention has a column portion consisting of a central joint portion at the center portion in the width direction, and can be formed into a convex lens cross section. Therefore, the heat exchanger tube of the present invention is difficult to deform during core molding, has stable contact with the fins, and has excellent thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of the core portion of the first embodiment, and FIG. 2 is a plan view of the first plate of the first embodiment. FIG. 3 is a partial perspective view of the core portion of the second embodiment, and FIG. 4 is a plan view of the first plate of the second embodiment. 1.6...First plate 2.7...Second plate 11.61...Peripheral joint part 12...Central joint part 6
2... Joint protrusion 13... Second joint part 14
．． 63... Protrusion 3.4.8... Passage 5.9
...Fin patent applicant Nippondenso Co., Ltd.

Claims (2)

[Claims] (1) A heat exchanger consisting of a belt-shaped first plate and a belt-shaped second plate that is integrally joined to the first plate and forms a fluid passage inside, and forms the core part of the heat exchanger together with the fins. The first plate and the second plate are connected to each other by protruding from both ends thereof in a direction approaching the other side to form both ends of the tube and forming the fluid passage. each of the first plate and the second plate has a central joint part that is higher than the peripheral joint part; A heat exchanger tube characterized by having a (2) The tube for a heat exchanger according to claim 1, wherein the central joint portion is continuous in the longitudinal direction, and mutually independent passages are formed on both sides of the central joint portion. (3) The tube for a heat exchanger according to claim 1, wherein the central joint portion comprises a plurality of joint protrusions connected in the longitudinal direction.