JPH0739914B2 - Heat exchanger - Google Patents

Abstract

1. Heat exchanger, particularly a cooling medium evaporator, consisting of a plurality of flat pipes parallel with one another, but arranged with a space between them and joined together, between which pipes a plurality of fins have been fitted to increase the heat exchange surface, said pipes being provided at both their end regions with a widened part of the pipe wall, being laid by means of this part directly on a corresponding part of the adjacent pipe and connected therewith, particularly by soldering, there being provided in each widened part, transversally to the longitudinal axis of the flat pipes, connection openings with the adjacent flat pipe or to the adjacent group of pipes, characterized in that the widened part (2a, 2b) of each flat pipe (2) extends over the entire width of the pipe, but, towards the narrow longitudinal sides (2') runs in the form of a pointed arch into the arc-shaped parts (8) of the flat pipe, and in that, in the region (20, 21) of each flat pipe (2, 20) lying between the widened parts (2a, 2b, 20a, 20b) of the pipe wall (4) turbulence inserts (7, 70) are provided which fill up the entire pipe width (B).

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, particularly a refrigerant vaporizer, and more particularly to a large number of parallel flat tubes arranged at a certain distance from each other and connected to each other. It consists of a number of fins that increase the heat exchange area between the flats, and the widened portions of the pipe wall are provided in both end regions of the flat pipe. The corresponding part is in direct contact and is connected to this part, in particular by soldering, in each widening part extending laterally to the longitudinal axis of the pipe and adjacent to one flat tube or to an adjacent flat tube. The present invention relates to a heat exchanger provided with an opening communicating with a tube group, particularly a refrigerant vaporizer.

[Conventional technology]

This type of heat exchanger is disclosed in the applicant's previous application, Japanese Patent Application No.
It has already been proposed by JP-A-290899 (JP-A-61-175481). In this type of heat exchanger, it is not necessary to solder or bond the flat tube over its entire length as compared with a heat exchanger having a disk-shaped heat exchanger, and only the end and the communication port are soldered or bonded. This has the advantage that a significant simplification of the production is achieved, since In the proposed construction, only the widened end of the flat tube is in direct contact, so that no separate tangential tube sleeve is required.

[Problems to be solved by the invention]

However, in the heat exchanger of this kind of structure, a disadvantage is that the widened portion at the end of the pipe does not extend over the entire width of the pipe. The reason for this is that overextending of the material when forming this kind of widening causes cracks, in particular in the region of the curved wall at the longitudinal end of the flat tube. Thereby, it is not possible to insert the pad inside the flat tube with the known construction, as is known in the example of oil coolers in the form of turbulent pads. In the widened part provided in the case of the proposed heat exchange element which does not extend over the entire width, it is only possible to insert a turbulent flow pad that fills only part of the tube width. In such a case, the heat exchange means will flow through the outside of the turbulence pad, so that the effect of the turbulence pad to improve heat transfer will not be achieved.

The present invention has been made to eliminate the above drawbacks, and provides a heat exchanger that enables a larger heat exchange capacity as compared with a tube in which the turbulent flow pad does not fill the entire width of the tube. It is an object.

[Means and Actions for Solving Problems]

In order to achieve the above object, according to the present invention, a configuration is adopted in which a turbulent flow pad that fills the entire width of the tube is provided between the widened portions of the tube of the heat exchanger. This allows for greater heat exchange capacity compared to tubes where the turbulence pad does not fill the full width of the tube.

This means that the widened portion of each flat tube extends sharply toward the narrow longitudinal direction side and forms the bent portion of the longitudinal edge of the flat tube, so that the widened portion is provided over the entire width of the tube. By being able to be done, it can be achieved. Because of the pointed extension of the widened portion toward the end regions, the tubing material stretches less in the end regions than in the central portions of the parallel tube walls. Therefore, there is no crack and no dangerous overstretching. This accomplishes in a simple manner a turbulence pad having the width of a flat tube can be axially inserted into an open tube and fixed in a known manner. It is also advantageous that no deformation occurs in the narrow end regions, which are generally provided with weld seams.

However, in another method, it is also possible to provide the widened portion only over a part of the width of the flat tube, but in this case, a predetermined means for inserting the turbulent flow pad over the entire width of the flat tube is provided. Must be provided. This means that the turbulence pad is first zig-zag corrugated and inserted into the central region of the oval tube and the region of the tube where the turbulence pad is attached is compressed in parallel, causing the turbulence pad to flatten from the corrugation. It is achieved by deforming until pressed into an elongated shape. Therefore, in this method, the flat tube is formed only after the turbulent flow pad is inserted. This method has proven to be very advantageous. This method has the advantage that the turbulent flow pad inserted in this way is fixed in the flat tube by initially deforming the central part of the oval tube into a plate shape.

〔Example〕

The features and advantages of the present invention will be described below with reference to two embodiments shown in the drawings.

First Embodiment A heat exchanger 1 shown in FIGS. 1 to 3 is composed of a large number of flat tubes 2 having axes 5 aligned parallel to each other and arranged directly adjacent to each other. The flat tubes 2 are in contact with each other at the widened widened portions 2a, 2b formed at their ends, and the heat exchange fins 3 are provided between the flat tubes. Is used to better remove the heat of the heat exchange medium, especially the air, flowing through the flat tube 2 in the plane of the drawing.

The widened portions 2a and 2b of the flat tube 2 are closed by a trap 10 inserted on the end face side in this embodiment. This trap is not provided in the lower two flat tubes in FIG. As is clear from the figure, the central portion 2c of the flat tube 2
Is a narrow tube which is significantly narrower than the widened portion 2a and has a bent portion 8 at the longitudinal edge of the flat tube having parallel walls.
The bends respectively transition to parallel walls 4. Further, as is clear from the figure, the widened portion 2a or similar portion 2b
Openings 6, 6'are formed in the parallel wall portions 4'of. This parallel wall portion 4'moves downwards via a transition region 9 into a wall 4, which is provided substantially vertically on the wall 4 as well as on the wall 4 '. This transition area 9 is reduced towards the longitudinal ends of the tube, ie towards the bend 8, respectively, which means that first the parallel walls 4 ′ extend towards the bend 8 so as to form a sharp bend. Because there is. Therefore, the extension of the material when widening the widened portions 2a and 2b gradually decreases toward the region of the bent portion 8 and becomes zero in the region of the bent portion. By widening in a pointed manner, the risk of cracking in the region of the bend can be completely prevented and the widening can be carried out with a suitable tool. As shown in FIG. 3, the tubes are provided in good contact with each other, and the turbulent flow device 7 having the entire width B of the flat tube 2 can be axially inserted and fixed in the flat tube. Have advantages.

As is clear from FIG. 2, the parallel walls 4'of the widened portion 2a.
Extend approximately in the region between the borderlines 11 and from this borderline outwards, which is formed by sharper bends of less material, and also preferably obliquely upwards outwards. An extending end wall portion 12 is provided,
An area extending low is provided in the area between the boundary lines 11. Due to this formation, care is taken that the material elongation can be kept within an acceptable range, even in the central region, ie in the region of the wall 4 '.

Second Embodiment FIG. 4 to FIG. 7 show another embodiment of the flat tube for vaporizing the refrigerant, which is also provided with the turbulent flow pad 70. The composition is different. In this embodiment, the end region of the flat tube is not widened, and the tube 20 'having an oval cross section is selected as the original material as shown in the upper part of FIG. 4, and the wall of this tube is selected. The spacing of the 40 from each other is indicated by b. The length of this oval tube 20 'is B'
Is. The turbulent flow pad 70 'is corrugated or zigzag inserted into the oval pipe 20' thus formed. The length of the turbulent flow pad is generally set to a length corresponding to the length of the deformed portion after the pipe is deformed as described later. Therefore, this turbulence pad 70 'having a length B is introduced into the tube 20 so as to occupy the area designated by the numeral 21 in the tube 20, as shown in the upper part of FIG. 4 (see FIGS. 5 and 6). Inserted axially, this turbulence pad is then deformed. After this deformation has taken place, this central part 21 is compressed by rollers or presses, and this area of the tube 20 'has a thickness d.
And have a width B. Therefore, the widened end region of the flat tube 20 thus formed does not have the entire width B. However, in the region 21, the turbulent pad 70 has a width B over its entire length, occupies the expanded position shown in FIG. 4 by the deformation process and is also fixed in this position in the axial direction. Openings similar to the openings 6 of the embodiment shown in FIGS. 1 to 3 can be provided in the portions 20a and 20b that are wider than the region 21 without changing in this deformation process. However, in this embodiment, two openings 60 to 60 'are formed in the widened portion.
Are formed, and these openings allow communication between the individual flat tubes 20 when the flat tubes are adjacent to each other. In the present embodiment, it is further considered that the opening 60 is provided with a sleeve 61 projecting outward, and this sleeve is formed by, for example, a suitable stamping. This embodiment then has the advantage that only one type of flat tube 20 is required to form a flat tube vaporizer or flat tube heat exchanger, and the flat tubes can be soldered together. Here, the sleeve 61 is set to a size that fits into the opening 60 '.
As in the other embodiments, the open end of this tube is trap 10
Closed by inserting.

[Brief description of drawings]

1 to 3 illustrate one embodiment of the present invention. FIG. 1 is a schematic vertical sectional view of a refrigerant vaporizer formed from flat tubes directly adjacent to each other according to the present invention, and FIG. 1 is a side view of a part of the refrigerant vaporizer of FIG. 1 in the direction of arrow II, FIG. 3 is a top view of the refrigerant vaporizer of FIG. 1 in the direction of arrow II, and only a part of the upper end of the pipe is open. 4 to 7 are diagrams for explaining another embodiment of the present invention, and FIG. 4 is a schematic explanatory diagram of the manufacturing process of the flat tube, in which the turbulent flow device is at the central portion. It has been inserted before the deformation, FIG. 5 is a side view showing a partial cross section of the flat tube formed by the method shown in FIG. 4, and FIG. 6 is taken along line VI-VI of the flat tube of FIG. FIG. 7 is a partial sectional view, and FIG. 7 is a top view of the pipe of FIG. 5 in the direction of arrow VII. 2,20 …… Flat tube, 2a, 2b, 20a, 20b …… Widened part, 7,70 turbulence pad, 8 …… Bent part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wolfgang Hesse Germany, 7827 Leifingen, Martinstrasse 11 (72) Inventor Berner Erichmann Germany, 7143 Bayingen / Enz, Einsteinstrasse 21 (72) Invention Herbert Schlader Germany, 7016 Gerlingen, Johann-Zimmermann-Strasse 22

Claims (8)

[Claims] 1. A flat tube comprising a plurality of parallel flat tubes arranged at a certain distance from each other and connected to each other, and a large number of fins for increasing a heat exchange area being inserted between the flat tubes. A widened portion of the pipe wall is provided in both end regions of the pipe, and the widened portion is in direct contact with a corresponding portion of an adjacent pipe, and is joined to this portion, in particular, by soldering. Inside the heat exchanger, there is an opening that extends laterally with respect to the longitudinal axis of the tube and communicates with one adjacent flat tube or a group of adjacent flat tubes. Heat exchange characterized in that a turbulent flow pad (7,70) is provided in the area (2c, 21) located between the portions (2a, 2b, 20a, 20b) to fill the entire width (B) of the tube. vessel. 2. The widened portion (2a, 2b) of each flat tube (2) extends over the entire width of the tube, but bends sharply toward the narrower longitudinal side (2 ') and is flattened. The heat exchanger according to claim 1, wherein the heat exchanger is a bent portion (8) of the pipe (2). 3. The heat exchanger according to claim 2, wherein a region to be the bent portion (8) of the widened portion (2a, 2b) is formed in a slightly spherical shape. 4. A widened portion (2a, 2b) wall transitioning from a wall to a parallel tube wall (4 ') extends substantially perpendicular to the parallel tube wall. Range second
The heat exchanger according to item 3 or 4. 5. The heat according to claim 1, wherein the widened portion (20a) of the flat tube (20) extends over a part of the width (B) of the flat tube (20). Exchanger. 6. The widened portion (20a) corresponds to the cross section of the elliptic tube (20 '), and the widened portion (20a, 20a) of the tube wall (40) of the elliptic tube (20a).
Heat exchanger according to claim 5, characterized in that the region between b) is compressed to a smaller width (b). 7. A flat tube (2) having widened ends (2a, 2b).
A heat exchanger according to claim 1, characterized in that a turbulent flow pad (7) is axially inserted in it. 8. A turbulent pad (70) of corrugated (70 ') is inserted into the central region (21) of an oval tube (20') and the turbulent pad (70 ') of this tube (20'). Claim 1 characterized in that the region (21) to which the ') is attached is compressed in parallel and deformed until the turbulent pad is pressed into a flattened form from the corrugations. The heat exchanger according to item.