JPH0245668Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a laminated heat exchanger used as an evaporator in a car cooler, for example.

BACKGROUND ART In this type of laminated heat exchanger, a plurality of plate-shaped tube elements and corrugated fins each having a communicating tank portion at the end are laminated in an alternating arrangement, and the distribution of the heat exchange medium is made uniform. Therefore, a header having a heat exchange medium circulation part is attached to the outer surface of the tank part of the outermost tube element having heat exchange medium circulation holes, with the communication opening on the outer surface facing the tank part, and the header A device is known in which a heat exchange medium is circulated through the communication opening of the tube element and the communication hole of the tube element (for example, Japanese Utility Model Publication No. 58-52464). In such a heat exchanger, the header is generally installed by temporarily assembling it together with corrugated fins, tube elements, etc., and brazing it in a furnace.

Problems that the invention aims to solve: However, in the conventional heat exchanger as described above, the header is located on the outer surface of the tank part of the outermost tube element, that is, located outside the heat exchanger core. Because of this, the header is likely to move from its proper position on the tube element during the assembly process of the heat exchanger, resulting in misalignment between the heat exchange medium circulation holes of the tube element and the communication openings of the header, resulting in heat loss. There was an obsession that caused the exchanger to deteriorate.

For this reason, conventionally, the
As seen in the publication, a side plate placed to cover the outside of the outermost corrugated fin is provided at a position higher than the height of the outer surface of the header by the thickness of the plate, and its end is placed in the direction of the header. The header is extended to cover the outer surface of the header, thereby allowing the side plate to hold the header and prevent its position from shifting, while ensuring that it can be reliably joined to the tube element side. Ta.

However, when the header is covered and held by the side plate as in this conventional example, the following new problem arises.
That is, since the header is located outside the core, it must originally have sufficient pressure resistance. For this purpose, thick-walled headers made of extruded aluminum, for example, are generally used;
During brazing, the temperature of the header is less likely to rise than other parts to be brazed, and it is more likely to cause a brazing failure with respect to the tube element. However, if the outer surface of the header is tightly covered with the side plate, the rapid temperature rise of the header during brazing is impeded, and defects due to the brazing failure described above are likely to occur.

In addition, there is a strong demand for this type of heat exchanger to be as compact as possible in order to install it in the narrow installation space of a car, and from a cost standpoint, it is also required to reduce the amount of materials used. When the side plate is placed over the outer surface of the header, the width of the heat exchanger core increases by the thickness of the side plate than the outer surface of the header, and the length of the side plate must be long enough to cover the header. be forced to accept disadvantages such as

This idea solves the above problems and
It is possible to secure the header in the proper position without causing any misalignment, and to achieve a reliable brazing connection, while reducing the core width and saving materials, improving quality and heat exchange performance. It is an object of the present invention to provide a laminated heat exchanger that does not cause a decrease in heat exchanger.

Means for Solving the Problems This invention consists of a plurality of plate-like tube elements and corrugated fins each having a communicating tank portion at the end and stacked in an alternating arrangement, and also having heat exchange medium circulation holes. In a laminated heat exchanger in which a header is attached to the outer surface of a tank portion of an outermost tube element in a communicating state, a ridge for positioning the header is formed at a peripheral edge of a heat exchange medium circulation hole of the outermost tube element. By fitting the header with the communication opening adapted to the projecting edge, its mounting position is defined, and the header covers the outside of the outermost corrugated fin disposed outside the outermost tube element. A side plate is arranged along the header, and the side plate is arranged so that its outer surface is at a height equal to or lower than the outer surface of the header, so that the edge on the header side does not overlap the header. The gist of the present invention is a stacked heat exchanger characterized in that the heat exchanger terminates at a position that closely faces the upper part of one inner side of the header.

Embodiments The configuration of this invention will be described below with reference to illustrated embodiments.

In the embodiment shown in FIGS. 1 to 4, 1 is a plurality of plate-shaped tube elements, 2 is a corrugated fin that is interposed between adjacent tube elements and is alternately laminated and joined together, 3 are upper and lower side plates disposed outside the outermost corrugated fin 2, 4 is an outlet header, and 4' is an inlet header.

Each of the tube elements 1 includes bulging tank portions 5 at both ends, and a flat tube portion 6 that communicates between these tank portions 5 and 5 to form a heat exchange medium passage. and the tank portion 5 of the adjacent tube element 1
They are integrated by soldering through a plurality of connection holes 7 arranged in parallel in the width direction. These tube elements 1 include a shallow dish-shaped molded plate 1a made of aluminum or the like and a substantially flat molded plate 1b at the top and bottom stages, and two dish-shaped molded plates 1a at the other middle part. , 1a are joined together at their respective peripheral edges. On the outer surface of the tank portion 5 of the uppermost and lowermost tube elements 1, a plurality of heat exchange medium circulation holes 8 are arranged in parallel at predetermined intervals in the width direction. An annular projecting edge 9 for positioning the headers 4, 4' is formed at the peripheral edge in a rising shape toward the outside.

The headers 4, 4' are provided to equalize the distribution of the heat exchange medium within the heat exchanger.
It is made of extruded aluminum material or the like and has a relatively thick wall, and has a substantially rectangular parallelepiped shape, with openings on the bottom surface for the outlet header 4 and the top surface for the inlet header 4'. It has a substantially rectangular recess 4a for heat exchange medium circulation. The length of the communication opening 15 of the recess 4a is set to be approximately the same as or slightly larger than the length of the ridge group consisting of the plurality of annular ridges 9 as a whole, and the width of the communication opening 15 is set to be approximately the same or slightly larger than the width of the rim group. The headers 4, 4' are tightly fitted with the communication opening 15 of the recess 4a on the outside of the group of annular projecting edges 9, so that the headers 4, 4' can maintain their positions in a defined state and the exit port. The upper part of one side of the header and the lower part of one side of the inlet header 4' face the edge of the side plate 3, and are soldered to the outer wall of the tank part 5 of the outermost tube element 1. ing. Furthermore, a protrusion 10 for connecting a heat exchange medium inlet/outlet pipe is formed on the outer surface of the header 4, 4', and a through hole 10a communicating with the recess 4a is bored in the protrusion 10. . A heat exchange medium inlet pipe 11 and a heat exchange medium outlet pipe 12 are welded and fixed to the distal end surface of the protruding portion 10 via short pipes 13 for connection assistance, respectively, in communication with the through hole 10a.

The corrugated fins 2 are generally made of aluminum and have louvers cut and formed. Further, in FIG. 4, reference numeral 14 denotes an inner fin interposed within the flat tube portion 6.

In addition, the side plate 3 which covers the outermost corrugated fin 2 and is disposed on the outside thereof has an outer surface at a height equal to or lower than the height of the outer surface of the header 4, as shown in FIG. The header 4 is provided so that it does not protrude outward from the header 4. Therefore, the edge on the header side does not overlap the header 4, but is slightly bent inward and terminated at a position facing the upper part of one inner side of the header 4.

Although not shown in the drawings, it is preferable that a partition plate is provided in each tank section 5 to change the flow direction of the heat exchange medium for each tube element group of a predetermined number and cause the medium to flow in a meandering manner. This divides the heat exchange medium circuit group into two or more, forming a so-called multi-pass heat exchanger.

In the above heat exchanger, the heat exchange medium supplied from the heat exchange medium inlet pipe 11 fills the elongated recess in the inlet header 4', and then flows into the tank section 5 of the tube element 1 at the lowest stage. The water flows into each of the flow holes 8 in almost equal parts. The heat exchange medium that has flowed into the heat exchange medium passage of the tube elements 1 is preferably circulated in a meandering manner in the opposite direction for each group of tube elements, and during this period, the heat exchange medium flows between the tube elements 1. It exchanges heat with the flowing air, and in the case of a heat exchanger used as an evaporator, evaporation occurs, and it is eventually sent from the circulation hole 8 of the uppermost tank section 5 to the outlet header 4 through the outlet pipe 12. The signal is then sent to a compressor, etc. (not shown).

By the way, the above heat exchanger is assembled by stacking the tube elements 1 and corrugated fins 2 alternately in multiple stages, then setting the side plates 3 and headers 4, 4', and brazing the whole in a temporarily assembled state. During the above-mentioned setting, the headers 4, 4' connect the communication opening 15 of the recess 4a constituting the heat exchange medium circulation section to the outermost tube element 1, as shown in FIG. By fitting into the annular protrusion 9 provided on the peripheral edge of each communication hole 8 on the outer surface of the tank portion 5, all the communication holes 8 can be easily set in the correct position facing the recess 4a. Furthermore, by bringing one side end of the outermost corrugated fin 2 into contact with the headers 4, 4' in this state,
Alternatively, by engaging the bent edge of the side plate 3, the corrugated fin 2 can also be fixed and positioned. Further, even during the handling process until the soldering is completed, the annular ridge 9 prevents the headers 4, 4' from moving, so that the headers can be maintained in the correct position and fixed by brazing.

In the illustrated embodiment described above, the circumferential edge of each of the circulation holes 8 on the outer surface of the outermost tank portion 5 forms an annular protrusion 9, but the circumferential edges of the circulation holes located at both ends Only the annular protrusion 9 may be formed.

Further, a hollow heat exchange medium circulation section is formed inside the header 4, 4', and one or more communication openings communicating with the circulation section are formed on the outer surface, and the openings are connected to the tank 5 side for communication. It may also be adapted individually to the holes 8. Furthermore, in the illustrated embodiment, the plate-like tube element 1 is formed by overlapping two molded plates, but instead of this, it may be formed by other forming means, for example, by forming two aluminum plates in a desired pattern. A roll bond panel or the like may be used, which is obtained by applying an anti-crimping material to the panels, overlapping them and pressing them together, and then expanding the non-crimped parts using fluid pressure. Furthermore, although a case has been shown in which a tube element 1 having tank portions 5 at both ends is used, this invention can be effectively applied to a tube element having a tank portion at one end. In addition, although a horizontal heat exchanger was shown in the example,
This idea may also be applied to a vertical heat exchanger.

Effects of the invention As explained above, this invention has a positioning rim formed on the outer surface of the tank part of the outermost tube element at the peripheral edge of the heat exchange medium circulation hole, and the header Since the installation position is determined by fitting the communication opening leading to the exchange medium circulation part into the projecting edge, there is no need to wait until the brazing is completed when assembling the heat exchanger. During the handling process, the projecting edge can prevent accidental movement of the header on the surface of the tank portion of the tube element, and the proper positional relationship between the header and the tube element can be maintained. Therefore, it is possible to avoid the risk of deterioration in the quality of the heat exchanger and deterioration in heat exchange performance due to misalignment between the communication hole and the communication opening, and it is possible to provide a stable product. In addition, the header can be positioned easily and accurately in the header setting operation, and the setting time can be shortened, thereby improving workability and productivity.

Furthermore, since the header can be correctly positioned and held by the positioning flange as described above, there is no need for the side plate to hold the header. For this reason, the side plate does not cover the header with its end portion, but is configured to have a short end edge that terminates at a position close to and facing the upper portion of one inner side of the header. Therefore, during brazing during assembly and production of a heat exchanger, the heating rate of the header can be prevented from being hindered and delayed by the side plates, and the brazing joining of the header to the tube element can be completed in a short time. In addition, the possibility of bonding failure can be reduced. In addition, by shortening the side plate as described above, not only can the material used be reduced, cost and weight can be reduced, but also the side plate can be positioned at a position equal to or lower than the outer surface of the header. By making the header thinner, the width of the heat exchanger core can be reduced by an amount equivalent to the thickness of the side plate, compared to the conventional case where the side plate is held over the header. This can contribute to the miniaturization of heat exchangers.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view of the area around the header, Figure 2 is a front view of the heat exchanger with some parts omitted, and Figure 3 shows the heat exchanger shown in Figure 2 with part of the side plate removed. The plan view shown in Fig. 4 is - in Fig. 3.
FIG. 1...Tube element, 2...Corrugated fin, 3...Side plate, 4...Outlet header, 4'...Inlet header, 4a...Recess, 5
... Tank section, 8 ... Heat exchange medium distribution hole, 9 ...
Annular projecting edge, 15...Communication opening.

Claims (1)

[Claims for Utility Model Registration] A plurality of plate-shaped tube elements and corrugated fins each having a communicating tank portion at the end are laminated in an alternating arrangement, and a tank of the outermost tube element having heat exchange medium circulation holes. In a laminated heat exchanger in which a header is attached in communication with the outer surface of the tube element, a header positioning protrusion is formed at a peripheral edge of the heat exchange medium circulation hole of the outermost tube element, and the header is attached to the protrusion. The mounting position is defined by matching the communication opening to the edge and fitting together, and the side plate is arranged to cover the outside of the outermost corrugated fin arranged on the outside of the outermost tube element, Moreover, the side plate is arranged so that its outer surface is at a height equal to or lower than the outer surface of the header, and the edge on the header side is not placed over the header but is attached to one inner side of the header. A laminated heat exchanger characterized in that the stacked heat exchanger terminates at a position close to and facing the upper part.