DE102005016941A1 - Collector of a condenser and condenser with such a manifold - Google Patents

Abstract

The collecting pipe (1) has a cover (2) and a floor (3) with a number of passages for holding flat pipes (4). The quotient of the remaining free interior cross-sectional area (A) of the collecting pipe with flat pipes pushed in to the collecting pipe cross-section area (B) blocked by the pushed in flat pipes lies in the range of 1.5 to 3.5. An independent claim is also included for a condenser for cooling coolant.

Description

The The invention relates to a header of a condenser for cooling a refrigerant according to the preamble of claim 1, and one with such Collector provided capacitor according to the preamble of the claim 6th

capacitors or heat exchangers, as for example for Air conditioning systems used in a motor vehicle, usually include a Variety of parallel flat tubes, the ends of both sides in passages of two facing each other Collecting tubes are arranged. The refrigerant to be cooled or cooling medium is by means of a feeder inserted into a manifold, flows through the flat tubes with release of heat and is discharged through a discharge opening taken from one of the manifolds again.

Of the refrigerant premier Inner cross-section in a header of a heat condenser should preferably be designed so that the flow resistance preferably is low for efficient operation to minimize the internal pressure drop. Further the entire inner volume of the manifold should be as low as possible be to the total mass of the cold by means of and thus of the vehicle, to minimize. The analogous weight argument of course applies also for the material use of the manifold.

Both the above requirements are affected by zones in the manifold, the no core flow of the refrigerant, but represent so-called dead water areas. Such dead water areas For example, undercuts or pockets in the interior of the Collection tube.

As already briefly mentioned above, exist common Flat tube capacitors with respect the refrigerant leading Parts of a network of parallel flat tubes and two opposite Manifolds. The flat tubes are here in a variety of inserted lateral transverse slots or passages of the manifolds. By also inserted into the headers partitions is the refrigerant meandering through directed different groups of flat tubes, wherein locally a longitudinal flow in the Inside the headers results.

in this connection make the laterally inserted into the headers flat tubes, for cost savings reasons have a straight cutting edge, by reducing the flow-through manifold cross-section a hindrance to the flow There are consequently between the inserted flat tube ends in the interior of the manifold, a plurality of dead water areas, the internal volume of the capacitor as well as the flow resistance unnecessarily increase by vortex formation.

mit
0,9 Pa Π 1.0
erfüllen muss.From the EP 1 347 259 A1 For example, a condenser for cooling a coolant with a multiplicity of flat tubes arranged in parallel is known, the ends of each of which open into one of two opposing headers. The manifolds of the known device in this case comprise a substantially semicircular cover part and a flattened bottom, wherein the ratio of the cross section X and the wetted cross-sectional circumference of the equation

With
0.9 Pa Π 1.0
must meet.

Indeed do not protrude the flat tubes of the known capacitor in the headers into it, resulting in a more costly production due to the Adaptation of the contour of the flat tubes to the bottom shape of the manifold leads.

Of the Invention is therefore the object of a manifold for a generic capacitor And to provide such a capacitor, in which by Flat tubes obstructed manifold cross section is minimized.

These Task is through a manifold of a capacitor with the features of claim 1 and such a capacitor having the features of claim 6 solved. Preferred embodiments The invention are the subject of the dependent claims.

at a collecting pipe of the invention Condenser for cooling a refrigerant the manifold a cover and a bottom, the bottom of a Variety of passages to Comprises receiving substantially parallel arranged flat tubes, is the quotient X from the remaining free inner cross-sectional area of the manifold with inserted flat tubes to that of the inserted flat tubes blocked manifold cross-sectional area in the interval 1.5 P X P 3.5.

Preferably, the manifold is made in two pieces and consists of two curved half-shells, namely the lid and the bottom, which are pushed one inside the other. In a further preferred embodiment, manifolds are also used, which are manufactured from one piece by a suitable method, for example by extrusion.

Preferably the lid has a substantially semicircular shape, while the Bottom has a flattened shape. Due to the flattened shape is reduces the effective insertion depth of the flat tubes into the manifold, whereby the depth of the dead water areas in the collecting pipe between the Flat tubes decreased while the free flow area between Lid and flat tubes by the flattening of the soil remains unchanged. In addition will due to the flattened shape of the soil, the cost of materials for the production same, and thus weight and cost reduced. Continue by flattening the bottom shape a smaller length of Flat tubes inserted into the manifolds, resulting in the same outer dimensions of the Condenser means that an additionally usable flat pipe section for the Condenser network is free, creating more air-side heat exchange surface for disposal stands.

Preferably is the wall thickness of the soil at 0.8 to 1.2 mm. To the above quotient X It should be noted that the figure is Π 1.5 for round bottom headers be achieved. Key figure values Θ 3.5 can only be achieved with high material thickness for the ground, as the Bending stress in the soil increases sharply with increasing flattening.

A inventive capacitor has a plurality of substantially parallel flat tubes on, on both sides in passages of two opposed inventive collecting pipes, as described above, are arranged. Preferably have the flat tubes have a straight cutting edge and, more preferably arranged in the headers at least one partition, whereby the refrigerant meandering through the flat tubes is passed.

Preferably are the headers and the flat tubes of a capacitor according to the invention Made of aluminum and / or an aluminum alloy.

By the manifold according to the invention and the corresponding capacitor results in an increase in performance by reducing the refrigerant side Pressure drop in the condenser and an increase in usable net height at constant Outside dimensions of the Capacitor. Furthermore, there is a weight reduction of the capacitor by the flattening of the soil and a reduction of the total filling quantity to refrigerant.

preferred embodiments The invention will be explained below with reference to the drawings.

1a and 1b show conventional manifolds in cross-sectional view;

2a and 2 B show manifolds according to the invention, and

3 shows a capacitor in a schematic representation.

1 shows a conventional manifold 1 in two-piece version, consisting of a lid 2 and a floor 3 whose cross-sections are substantially semicircular. Shown is also the insertion of a provided with a straight cutting edge flat tube 4 in a corresponding passage of the soil 3 , Through the insertion of the flat tube 4 in the ground 3 becomes the total cross-sectional area of the manifold 1 divided into a free inner cross-sectional area A, and an obstructed by the inserted flat tube inner cross-sectional area B of the manifold 1 ,

von 1,4 ergibt. Die sonstigen Bemaßungen sind eine Dicke des Rohres von 19,4 mm bei einer Bodenwandstärke von 1,2 mm.For 1a the unobstructed inner tube cross-sectional area A is 128 mm ² and the area B is 92 mm ² , so that for the manifold after 1a a key figure

of 1.4. The other dimensions are a tube thickness of 19.4 mm with a bottom wall thickness of 1.2 mm.

1b shows the same situation as 1a except that here the free cross-sectional area A is 134 mm ² compared to a covered area of 22 mm ² , which leads to an index of X = 1.5, the pipe thickness being 19.2 mm and the wall thickness of the floor being 1 mm.

2a shows a first embodiment of the collection tube according to the invention, in which the radius of curvature of the bottom is 13 mm. This results in a total height of 16 mm, a free cross-sectional area of 126 mm ² compared to a through the inserted flat tube 4 Covered cross-sectional area of 57 mm ² , resulting in a ratio of 2.2.

Even better, the ratio in the embodiment after 2 B in which the ground 3 has a radius of curvature of 25 mm, resulting in a pipe height of 14.4 mm leads. In this embodiment, the free cross-sectional area is also 126 mm ² against a covered cross-sectional area B = 39 mm ² , resulting in a figure of 3.2. In the cases of 2a and 2 B the thickness of the floor is 1 mm.

3 shows a capacitor 10 for cooling a coolant, as used for example in an air conditioning system of a motor vehicle, with a left and a right manifold 1 . 1' in which flat tubes 4 are inserted in not shown passages. The left manifold 1 has an inlet 11 and the right manifold 1' an outlet 12 for the coolant on. Between the flat tubes 4 may still heat transfer plates (not shown) are mounted to maximize the removal of the heat of the coolant.

1

manifold

1'

manifold

2

cover

3

ground

4

flat tube

10

capacitor

11

inlet

12

outlet

Claims (9)

Manifold ( 1 . 1' ) of a capacitor ( 10 ) for cooling a refrigerant with a lid ( 2 ) and a floor ( 3 ), the soil ( 3 ) a plurality of passages for receiving flat tubes ( 4 ), characterized in that the quotient X from the remaining free inner cross-sectional area (A) of the collecting tube with inserted flat tubes to the blocked by the inserted flat tubes manifold cross-sectional area (B) in the interval 1.5 less than or equal to X is less than or equal to 3.5 , Collecting tube according to claim 1, characterized in that the collecting tube ( 1 . 1' ) is designed in two pieces. Collecting tube according to claim 1, characterized in that the collecting tube ( 1 . 1' ) is made in one piece. Collecting tube according to one of the preceding claims, characterized in that the lid ( 2 ) in cross-section substantially a semicircular shape and the bottom ( 3 ) have a flattened shape. Collecting tube according to one of the preceding claims, characterized in that the wall thickness of the soil ( 3 ) Is 0.8 to 1.2 mm. Capacitor having a plurality of substantially parallel arranged flat tubes ( 4 ), which are bilaterally in the passages of two gegenueberlieender manifolds ( 1 . 1' ) are arranged according to one of the preceding claims. Condenser according to claim 6, characterized in that the flat tubes ( 4 ) have a straight cutting edge. Condenser according to one of claims 6 or 7, characterized in that in the headers ( 1 . 1' ) is arranged at least one partition, whereby the refrigerant meandering through the flat tubes ( 4 ). Condenser according to one of claims 6 to 7, characterized in that the collecting pipes ( 1 . 1' ) and the flat tubes ( 4 ) are made of aluminum and / or an aluminum alloy.