JPS625097A - Lamination type heat exchanger - Google Patents

Abstract

PURPOSE:To increase pressure resistant strength and reduce pressure loss by a method wherein a core plate is provided with ribs, having curved surface, on the inner wall thereof, which is constituting medium flowing chambers, and a corresponding core plate is provided with the ribs, having flat surface, on the inner wall surface thereof while both of the core plates are bonded. CONSTITUTION:The core plate 4 is provided with inlet and outlet ports 4a, 4b, bonding surface 4c and a partitioning wall 4d while the ribs 4e, having curved surface, and the ribs 4f, having flat surface, are provided so as to be slanted with respect to the flow direction of the medium and showing the shapes of comparatively short beads. The ribs 4e, having curved surface, are provided at the left side of a partitioning wall 4d so as to have a substantially triangular section having the top part of rounded curved curved surface while the ribs 4f, having flat surface, are formed so as to have a substantially truncated triangular section having the top of flat surface and provided at the right side of the partitioning wall 4d. When these tow sheets of core plates 4 are bonded, both ribs 4e, 4f are contacted with each other and form a labyrinth for passing refrigerant. Bonding of both ribs are effected through line contact and the pressure resistant strength may be improved without reducing heat transfer area while the pressure loss of the medium may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a laminated heat exchanger used in an air conditioner for an automobile or the like. .

[Conventional technology] A laminated heat exchanger is made by bonding two core plates together.
It has an inlet and an outlet for a heat exchange medium, and the outlet and inlet of a flat tube whose inside is a heat exchange medium are joined to each other, and a plurality of flat tubes are laminated and combined in the flat direction. One core plate of this laminated type heat exchanger is provided with ribs on the inner wall of the medium circulation chamber to give strength to the core plate and to complicate the flow of the medium flowing in the medium circulation chamber to improve the heat exchange efficiency. The tips of the ribs are joined to each other. Conventionally, the ribs of this core plate are provided so as to be inclined with respect to the flow direction of the medium, as shown in FIG. 10, for example, and face ribs 4e having curved tips have been used.

[Problems to be Solved by the Invention] However, as shown above, in the laminated heat exchanger using ribs having curved tips, the curved ribs 4e and 4e of the two core plates 4 are bonded to each other. As shown in FIGS. 11 and 12, since it is a point joint, there is a problem in that the pressure resistance inside the medium circulation chamber is low. In addition, in order to solve this problem, as shown in FIG. As shown in FIG. 14, a core plate 4 is used which has surface contact and has increased pressure resistance inside the medium circulation chamber. However, this core plate 4 has a problem in that the pressure loss of the medium increases because the joint portion between the planar ribs 4f and 4f is a surface joint, and the medium passage cross-sectional area is reduced. .

The present invention has been made in view of the above circumstances, and its purpose is to provide a laminated heat exchanger that can increase the pressure resistance inside the medium circulation chamber without increasing the pressure loss inside the medium circulation chamber. be.

[Means for solving the problems] In order to achieve the above object, the laminated heat exchanger of the present invention has the following features:
It is formed by bonding two core plates with inlet holes and outlet holes for heat exchange medium, and is a combination of multiple laminated flat tubes whose insides serve as medium circulation chambers for the flow of heat exchange medium. In the laminated heat exchanger, an inner wall of the core plate constituting the medium circulation chamber is provided with a curved rib having a curved tip, and an inner wall surface of the core plate corresponding to the core plate has a planar tip. A configuration was adopted in which a planar rib was provided, and the tip of the curved rib and the tip of the planar rib were joined.

[Operations and Effects of the Invention] The laminated heat exchanger of the present invention having the above-mentioned configuration is provided with a curved rib having a curved tip on the inner wall surface of the core plate forming the medium circulation chamber, and a curved rib with a curved tip at the tip of the curved rib. By providing planar ribs with flat tips on the inner wall surface of the core plate at corresponding positions, and joining the tips of the curved ribs and the planar ribs, the bonding state of the curved ribs and the planar ribs is a line bond. Therefore, the pressure resistance inside the medium circulation chamber can be increased without reducing the surface area within the medium circulation chamber. Moreover, compared to a structure in which the tips of the ribs are mutually planar, the pressure loss of the medium can be reduced.

[Example] Next, a laminated heat exchanger of the present invention will be explained based on an example shown in the drawings.

1 is a refrigerant evaporator (
This is a stacked heat exchanger) installed in the ventilation duct of the air conditioner installed inside the instrument panel inside the vehicle. 3 and 31
are a pipe and a pipe joint that introduce refrigerant into the refrigerant evaporator 1, and are connected to a pipe on the refrigerant discharge side of the refrigerant compressor of the refrigeration system. 2 and 21 are piping and pipe joints through which the refrigerant that has passed through the refrigerant evaporator 1 flows out, and are connected to piping on the refrigerant suction side of the refrigerant compressor. 4 is a core plate, and a flat tube 41 is constructed by bonding two core plates together. At the top of the flat tube 41, there is an inlet side tank 42 that evenly distributes the refrigerant flowing in through the piping 2 to the refrigerant distribution chambers (medium distribution chambers) 41a in the flat tube 41 provided with a plurality of flat tubes, and an inlet side tank 42 that evenly distributes the refrigerant flowing in through the piping 2 to the refrigerant distribution chambers (medium distribution chambers) 41a inside the flat tube 41, and An outlet tank is provided to collect the refrigerant. The core plate 4 is made of aluminum or brass, which has excellent thermal conductivity, and is made of a lightweight metal plate. Brazing is performed on both sides of the core material by metal processing such as pressing of a plate-like element that is pre-clad with brazing material for assembly. It was formed by a surgical technique. 4
4b is a hole for inlet and outlet of refrigerant into the inlet side tank 42, and 4b is a hole for inlet and outlet of refrigerant into the outlet side tank. 4C is a bonding surface for the brazing material on the peripheral edge of the core plate 4, and 4d is a partition wall provided in the vertical direction at the center of the core plate 4 to form a U-turn-shaped refrigerant passage within the refrigerant circulation chamber 41a. 1, 4e and 4 are such curved ribs and flat ribs of the present invention, which exhibit relatively short beads inclined with respect to the flow direction of the refrigerant, and provide strength to the flat tube 41 after joining the core plate 4, and Forms a maze for coolant passage. As shown in FIG. 3, the curved rib 4e provided on the left side of the partition wall 4d of the core plate 4 has a substantially triangular cross section with a curved tip.
As shown in FIG. 4, the flat rib 4r provided on the right side has a substantially trapezoidal cross section with a flat tip. The tips of the curved rib 40 and the planar rib 4f are formed on the same plane as the bonding surface 4C and the partition wall 4d so that the tips of the curved rib 4e and the planar rib 4f come into contact during soldering. The inclination of the curved ribs 4e and the flat ribs 4f with respect to the flow direction of the refrigerant makes the flow of the refrigerant appropriate speed, and
Since it is for stirring the refrigerant in the refrigerant circulation chamber 41a to improve the heat exchange rate, it is necessary to select it appropriately. Note that the curved rib 4e and the flat rib 4" can be molded at the same time when the core plate 4 is molded. Reference numeral 5 denotes a side plate that is in contact with the outer surface of the refrigerant evaporator 1. This side plate 5 is pre-clad with brazing material for brazing assembly on at least the surface on which the lower corrugated fins 6 are disposed. The corrugated fins are provided to increase the heat transfer area between the refrigerant flowing in the flat tubes 41 and the air flowing in the air conditioner passing between adjacent flat tubes 41. 6 is a lightweight root-like element made of aluminum, brass, or the like with excellent thermal conductivity, and is formed by a metal processing technique such as press sheet metal processing.

Next, a method for assembling the laminated heat exchanger will be explained.

This heat exchanger, which is called a laminated type in the industry, has the shape shown in Figure 1, and has a core plate 4 whose front and back sides are pre-clad with brazing material, and a corrugated core plate which is not clad with brazing material. As shown in FIG. 8, the fins 6 and the side plate 5, in which at least the side on which the corrugated fins 6 are disposed, are clad with a brazing material, are sequentially assembled from one end to the side plate 5, the corrugated fins 6, and the flat plate. Core plate 4 forming one half of the tube 41
, a core plate 4 forming the other half, a corrugated fin 6, a core plate 4 forming the -half, and a core plate 4 forming the other half.
, corrugate fins 6, etc., and finally, the side plate 5 is applied to complete the temporary assembly, and then the brazing filler metal is melted while fixing this temporary assembled state using a jig. Brazing is heated to a certain temperature and kept in a furnace for a certain period of time, then allowed to cool to complete the assembly of the main body part, and then the pipes 2 and 3 are brazed. . After joining, curved rib 4e
As shown in FIGS. 5 to 7, the planar ribs 4f are joined by the brazing filler metal 1r to form a line joint, so that the surface area inside the medium circulation chamber 41a is not reduced and compared to conventional point joints. Therefore, the pressure resistance inside the medium circulation chamber 41a can be increased.

When the refrigerant evaporator 1 created as described above is installed in the air conditioner of a vehicle, the pipes 2 and 3 are connected to other refrigeration equipment, and the refrigerant compressor is driven, the refrigerant evaporator 1 is A refrigerant that has been made into a low-temperature mist by another refrigeration device flows into the inlet side tank 42 of the refrigerant. The inflowing refrigerant is sent from the inlet side tank 42 to each refrigerant circulation chamber 41a in the flat tube 41 in parallel. Here, the refrigerant is applied to the curved ribs 4 as shown in FIG.
It flows through a labyrinth created by the planar ribs 4f and the planar ribs 4f. At this time, the refrigerant that is stirred in the labyrinth and given the flow resistance and the air passing between each of the corrugated fins exchange heat via the core plate 4 and the corrugated fins 6. As a result, the air passing through the rug gate fins 6 is cooled, cooling the interior of the vehicle.

Refrigerant distribution chamber 41a that exchanges heat with air in the air conditioner
The refrigerant that has passed through is collected in the outlet tank and flows out again to another refrigeration device via piping 3.

Another embodiment of the present invention will be explained in FIG.

In this embodiment, the curved rib 4e and the flat rib 4f are divided into a plurality of parts in the longitudinal direction, and above all, the curved rib 4e with a curved tip and the flat rib 4f with a flat tip are arranged adjacent to each other. In the embodiment, the curved rib 4e and the flat rib 4f are divided into four in the vertical direction, and the curved rib 40 and the flat rib 4f are provided adjacent to each other from the left side.

The above example shows an example in which a stacked heat exchanger is applied to a refrigerant evaporator of a vehicle air conditioner, but it can also be applied to a refrigerant condenser or refrigerant evaporator of a refrigeration system for vehicles, homes, industrial use, etc. The present invention can be applied to any device for optionally exchanging heat between a fluid and another fluid, such as a radiator for cooling engine cooling water, a heater core, or an oil cooler.

In the above embodiment, a brazing filler metal was used when creating the laminated heat exchanger, but other bonding methods such as adhesion and soldering may be used.

In the above embodiment, the inlet and outlet for the heat exchange medium were provided on one side of the core plate, but they may be provided on both ends.

In the above embodiment, the pipes (2, 3) for supplying and discharging the medium in the laminated heat exchanger were provided on each of the left and right sides, but they may be provided on one side.

In the above embodiment, an example is shown in which a rib having a curved tip has a substantially triangular cross section, but other convex portions having a curved tip, such as an arcuate cross section, may be used.

In the above embodiment, an example was shown in which a rib with a planar tip has a substantially trapezoidal cross section, but other convex portions having a planar tip, such as a rectangular cross section, may be used.

[Brief explanation of the drawing]

Figure 1 is a front view of the core plate, Figure 2 is the I shown in Figure 1.
3 is a sectional view taken along the line I-II shown in FIG. 1, FIG. 4 is a sectional view taken along the line ■-■ shown in FIG. 1, and FIG. An explanatory diagram of the bonded state, Fig. 6 is the 5th
7 is a sectional view taken along the line V-V shown in FIG. 5, FIG. 8 is a front view of the refrigerant evaporator, and FIG. 9 is another embodiment. 10 and 13 are explanatory diagrams of conventional ribs and the joint state of the ribs, and FIG. 11 is a front view of the core plate showing the Vl-V shown in FIG.
A cross-sectional view along line I, FIG. 12 is the VI shown in FIG. 10.
-■ Cross-sectional view along the line, Fig. 14 is shown in Fig. 13 -■
It is a sectional view along a line. In the diagram 1... Refrigerant evaporator 4... Core plate 4
a.

Claims (1)

[Claims] 1) Formed by bonding together two core plates each having an inlet hole and an outlet hole for a heat exchange medium, the inside of which has a medium circulation chamber for flowing the heat exchange medium. In a laminated heat exchanger in which a plurality of flat tubes are laminated and combined, a curved rib having a curved tip is provided on an inner wall constituting the medium circulation chamber of the core plate, and a core plate corresponding to the core plate is provided. 1. A laminated heat exchanger characterized in that a planar rib having a flat tip is provided on an inner wall surface of the heat exchanger, and the tip of the curved rib and the tip of the planar rib are joined to each other. 2) The laminated heat exchanger according to claim 1, wherein the curved rib has a triangular cross section. 3) The laminated heat exchanger according to claim 1, wherein the planar rib has a substantially trapezoidal cross section.