DE102011080673A1 - Refrigerant condenser component for motor car air conditioning apparatus, has aperture mounted in collecting pipe portion or in return section, where flow cross-sectional area for coolant to aperture is smaller than outer side of aperture - Google Patents

Abstract

The component (1) has cooling pipes (2) for passing coolant. Two collecting tubes (5) for connecting cooling pipes with an inlet portion to introduce coolants into a flow area, an outlet portion to recover the coolant from the flow area and a return section to reroute the coolant of the flow area into another flow area. An aperture is mounted in a collecting pipe portion or in the return section, where a flow cross-sectional area for the coolant to the aperture is smaller than an outer side of the aperture in the collecting tubes. An independent claim is also included for a motor car air conditioning apparatus.

Description

The present invention relates to a refrigerant condenser assembly according to the preamble of claim 1 and an automotive air conditioning system according to the preamble of claim 10.

In refrigerant condenser assemblies for an automotive air conditioning system, vaporous refrigerant is converted into a liquid state of matter, and preferably then the liquid refrigerant is further "subcooled" in a subcooling region. The refrigerant condenser assembly forms part of a refrigeration circuit of an automotive air conditioning system with an evaporator, an expansion device and a compressor. In the refrigerant condenser assembly, the refrigerant should be cooled as much as possible. When condensing the refrigerant, there is an uneven distribution of the condensed refrigerant to the subsequent tubes, so that in the cooling tubes predominantly gaseous refrigerant and in other cooling tubes flows through mainly liquid refrigerant. This uneven loading of the cooling tubes with gaseous and liquid refrigerants disadvantageously reduces the cooling capacity of the refrigerant condenser assembly.

The EP 0 479 775 B1 shows a condenser for liquefying a gaseous refrigerant in an air conditioner of a car. Refrigerant is passed through a plurality of flat tubular members and selected fin sections are disposed between the tubular members. Two manifolds are disposed at opposite ends of the tubular members and have a coolant inlet and a coolant outlet.

The DE 696 00 580 T2 shows a heat exchange fluid box comprising a tubular wall which consists of a round bent sheet metal in the form of a cylinder, so that two opposite edges of this sheet face each other with their edges, said edges are connected by a soldering material tightly and firmly together and the wall has openings aligned along a diametrically opposite generatrix to the edges for passage of fluid circulation tubes of the heat exchanger, said edges having non-rectilinear paths associated therewith defining undercuts which can ensure mutual securement of the peripheries circumferentially.

The object of the present invention is therefore to provide a refrigerant condenser assembly and an automotive air conditioning system in which the refrigerant condenser assembly has a large cooling capacity with a small space requirement.

This object is achieved with a refrigerant condenser assembly for an automotive air conditioning system, comprising cooling tubes for passing a refrigerant, the cooling tubes are arranged in flow regions with at least one cooling tube, preferably at least two cooling tubes of a flow region are fluidly connected in parallel, and the flow regions are fluidly connected in series, two A manifold for fluidly connecting the cooling tubes with an inlet portion as a header portion for introducing the coolant into a flow area, an outlet portion as a header portion for discharging the coolant from a flow area and at least one deflection portion as a header portion for bypassing the refrigerant from one flow area to another flow area, wherein in at least a collecting pipe section, in particular in the at least one deflection section, at least one aperture is installed and the flowqu erschnittsfläche for the refrigerant at the at least one aperture is smaller than outside the at least one aperture in the manifold.

The refrigerant condenser assembly preferably has an overheating region for cooling the vaporous refrigerant, a condensation region for condensing the refrigerant, and a subcooling region for cooling the liquid refrigerant below a boiling temperature of the refrigerant. In the refrigerant condenser assembly thus gaseous refrigerant is liquefied, so that when cooling or liquefying the density of the refrigerant greatly increased and thereby the volume of the refrigerant is greatly reduced. With the diaphragm, the refrigerant is homogenized with respect to gaseous and liquid fractions, so that cooling tubes with predominantly gaseous and predominantly liquid refrigerants essentially do not occur in the cooling tubes at the flow region in the flow direction downstream of the orifice. As a result, the refrigerant can condense in all the cooling tubes in the flow direction of the refrigerant after the orifice and the cooling performance can be improved.

In a further embodiment, the ratio between the flow cross-sectional area at the at least one blonde and the flow cross-sectional area outside the at least one blonde at the collection tube is between 0.9 and 0.2, for example between 0.8 and 0.4, preferably between 0.7 and 0.5, in particular between 0.65 and 0.55.

In a supplementary variant, the at least one diaphragm with respect to the axial Expansion of the manifold between two flow regions at the deflection section installed in the manifold. As a result, the refrigerant after the orifice enters the portion of the turn-around portion uniformly with respect to the distribution of gaseous and liquid refrigerant from which the refrigerant is introduced into the flow area.

In a further embodiment, the at least one diaphragm is installed with respect to the axial extent of the collecting tube at a distance to a fictitious dividing line between two flow regions at the deflecting section in the collecting tube.

In a further embodiment, the at least one orifice is installed with respect to the axial extent of the header at a distance of at least one, two, three, five, ten, twenty, or thirty cooling tube widths from the notional dividing line at the diverter in the header.

Preferably, the diaphragm is designed as a partition wall with at least one, preferably only one, opening, and in particular a fictitious plane spanned by the partition wall is aligned substantially perpendicular to a longitudinal axis of the collector tube. The blonde can thus be easily mounted in the manifold, z. B. when soldering in a soldering oven. Aligned substantially perpendicular to the longitudinal axis means that the notional plane is aligned with a deviation of less than 30 °, 20 °, 10 ° or 5 ° perpendicular to the longitudinal axis of the manifold.

In a further embodiment, at least one diaphragm is formed on the inlet section and / or on the outlet section of the two header tubes. Thus, at the inlet and outlet section, in particular at the inlet section, a substantially uniform distribution of liquid and gaseous refrigerant can be achieved, and in particular in the first flow region, the refrigerant occurs uniformly with respect to the distribution of gas and liquid refrigerant.

In a further embodiment, the at least one opening is circular, elliptical, polygonal, in particular rectangular, z. B. square, or triangular formed.

The refrigerant condenser assembly expediently comprises a collecting container with at least one overflow opening by means of which the collecting container is in fluid communication with the cooling tubes and / or the collecting tube.

In a supplementary variant, the aperture consists at least partially, in particular completely, of the same material as the manifold and / or the cooling tubes, for. As metal, especially aluminum.

An automotive air conditioning system according to the invention, comprising a refrigerant condenser assembly, an evaporator, a compressor, preferably a blower, preferably a housing for receiving the blower and the evaporator, wherein the refrigerant condenser assembly is formed as a refrigerant condenser assembly described in this patent application.

In an additional embodiment, the refrigerant is R1234yf or R134a.

In a variant, the refrigerant condenser assembly has a closure device formed on the collecting container for closing a closure opening of the collecting container.

Preferably, a dryer and / or a filter are arranged in the collecting container and / or in the closure device.

Hereinafter, embodiments of the invention will be described in more detail with reference to the accompanying drawings. It shows:

1 a perspective view of a refrigerant condenser assembly,

2 a partial perspective view of the refrigerant condenser assembly according to 1 and

3 FIG. 2 shows a flow diagram of the refrigerant condenser assembly with two flow regions without collecting container, FIG.

4 FIG. 2 is a flow chart of the refrigerant condenser assembly with four flow areas with sump, FIG.

5 a view of a diaphragm in a first embodiment,

6 a view of the blonde in a second embodiment,

7 a view of the blonde in a third embodiment,

8th a view of the aperture in a fourth embodiment,

9 a view of the aperture in a fifth embodiment and

10 a view of the aperture in a sixth embodiment.

In 1 and 2 is a refrigerant condenser assembly 1 shown in a perspective view. The refrigerant condenser assembly 1 is part of an automotive air conditioning system with an evaporator and a compressor (not shown). By horizontally arranged cooling tubes 2 as flat tubes 3 in flow areas 11 ( 3 and 4 ) flows to be condensed and cooled refrigerant ( 1 and 2 ). The cooling pipes 2 open at their respective ends in a vertical manifold 5 ie there are two headers 5 each at the ends of the cooling tubes 2 available. In 2 is just a collection pipe 5 shown. The manifold 5 has for this cooling tube openings through which the ends of the cooling tubes 2 into the manifold 5 protrude. Inside the headers 5 baffles (not shown) are formed with which a certain flow path of the refrigerant through the cooling tubes 2 can be achieved for the subdivision of the flat tubes 3 into the flow areas 11 ,

Between the cooling pipes 2 are meandering corrugated ribs 4 arranged, which with the cooling pipes 2 in thermal and mechanical connection stand for heat conduction. This increases the area available for cooling the refrigerant. The cooling pipes 2 , the corrugated ribs 4 and the two manifolds 4 are generally made of metal, in particular aluminum, and are materially connected to one another as a solder joint. In four corners of the refrigerant condenser assembly 1 is a fastening device 8th arranged, with which the refrigerant condenser assembly 1 on a motor vehicle, in particular on a body of a motor vehicle, can be attached.

At the manifold 4 is, also vertically aligned, a collection container 6 arranged ( 1 . 2 ). The collection container 6 is by means of two overflow openings (not shown) in fluid communication with the manifold 5 and thus also indirectly in fluid communication with the cooling tubes 2 , In the collection container 6 a dryer and a filter (not shown) are arranged. The dryer is hygroscopic and can absorb water or moisture from the refrigerant. The collection container 6 is at the lower and upper end with the manifold 5 mechanically connected to a concave support area. At the bottom is the sump 6 from a closure device 7 sealed fluid-tight. The removable closure device 7 allows replacement of the dryer and filter in the sump 6 ,

The refrigerant condenser assembly 1 has an inlet opening 9 for introducing the refrigerant into the refrigerant condenser assembly 1 and an outlet opening 10 for discharging the refrigerant from the refrigerant condenser assembly 1 ( 1 and 3 ) on. The ends of the cooling pipes 2 end up in the headers 5 ,

The refrigerant condenser assembly 1 represents a heat exchanger for transferring heat from the refrigerant to air, which is the refrigerant condenser assembly 1 surrounds and flows around them. In this case, the heat exchanger is essentially of the cooling tubes 2 and the two headers 5 educated. The gaseous refrigerant is cooled at an overheating range to a saturation temperature, ie at the saturation temperature occurs in accordance with the existing pressure, a condensation of the refrigerant. In the flow direction of the refrigerant after the overheating region, a condensation region follows, in which the refrigerant is condensed and thus liquefied. The refrigerant liquefied in the condensation zone is supplied as a liquid to the subcooling region and cooled in the subcooling region below the boiling point of the refrigerant.

In 3 is a highly simplified flow diagram of the refrigerant condenser assembly 1 without collection container 6 shown. The refrigerant is through a not in 3 illustrated inlet opening 9 in an inlet section 13 of the left header 5 as a collection pipe section 12 initiated. From the inlet section 13 The refrigerant is in a variety of stacked flat tubes 3 a first upper flow area 11 initiated. Here are the flat tubes, not shown 3 of the first flow area 11 fluid-conducting connected in parallel. The refrigerant is thus as shown in FIG 3 from the inlet section 13 from left to right in the flow area 11 with the variety of flat tubes 3 in a deflection section 15 of the right manifold 5 as a collection pipe section 12 initiated. From the deflection section 15 this will be from the first upper flow area 11 in the deflection section 15 then introduced refrigerant into a second lower flow area 11 , also with a variety of stacked flat tubes 3 , initiated. Here are the flat tubes 3 of the second lower flow area 11 likewise switched fluid-parallel in parallel. After passing the refrigerant through the second lower flow region 11 from right to left as shown in 3 the refrigerant gets out of the flat tubes 3 of the second lower flow kingdom 11 in an outlet section 14 of the left header 5 as a collection pipe section 12 initiated. From the outlet section 14 is the refrigerant by a not in 3 illustrated outlet opening 10 from the refrigerant condenser assembly 1 discharged. At the deflection section 15 is with respect to the axial extent of the manifold 5 in the direction of a longitudinal axis 15 of the manifold 5 between the two flow areas 11 a panel 16 arranged. At the aperture 16 is the flow cross-sectional area for the refrigerant only about 50% of the flow cross-sectional area than outside the aperture 16 in the manifold 5 , The refrigerant is thereby swirled and homogenized with respect to liquid and gaseous fractions, so that in the lower flow area 11 in the flat tubes 3 essentially a mixture with equal proportions of gaseous and liquid refrigerant through the flat tubes 3 flows. Thereby, the cooling capacity of the refrigerant condenser assembly can be increased, because in flat tubes 3 , through which substantially liquid refrigerant flows, substantially no condensation is possible.

In 4 is a flow diagram of the refrigerant condenser assembly 1 with four flow areas 11 and with a collection container 6 shown. The refrigerant condenser assembly 1 thus has a first upper flow area 11 and viewed from top to bottom as shown in FIG 4 a second flow area 11 , a third flow area 11 and a fourth flow area 11 on. After introducing the refrigerant from the inlet section 13 in the upper first flow area 11 the refrigerant is in an upper deflection section 15 at the right manifold 5 initiated, from the upper right first deflecting section 15 in the second flow area 11 introduced and from the second flow area 11 in a second left-hand deflecting section 15 on the left header 5 introduced and from this in the third flow area 11 initiated. From the third flow area 11 the flat tubes 3 the refrigerant flows through a third deflection section 15 on the right manifold 5 or through the collection container 6 and becomes from this into the fourth lowest flow area 11 initiated. From the fourth lowest flow area 11 the refrigerant is in the outlet section 14 on the left manifold 5 with the outlet opening, not shown 10 initiated. In this four-flow refrigerant condenser assembly 1 with four flow areas 11 , each having a plurality of stacked flat tubes 3 have, which are connected in parallel fluid-conducting occurs after the discharge from the first flow region 11 not yet a substantially complete liquefaction of the refrigerant. For this reason, at the right upper first deflecting section 15 with respect to the axial extent of the manifold 5 between the first and second flow regions 11 a panel 16 arranged so that in the second flow area 11 the flat tube 3 are charged with a substantially similar mixture of liquid and gaseous refrigerant. In addition, at the second deflection section is also a diaphragm 16 arranged. The aperture 16 However, it is not with respect to the axial extent of the manifold 5 between the first and second flow regions 11 but above a fictitious dividing line between the second and third flow areas 11 , This will make the flat tubes 3 in the third flow area 11 supplied with a substantially same mixture of liquid and gaseous refrigerant, provided that through the third flow area 11 Guided refrigerant is not completely liquefied.

In the 5 to 10 are different examples of as a partition 17 trained aperture 16 shown. The partition 17 has one opening each 18 on and one of the partition 17 spanned fictitious plane is substantially perpendicular to the longitudinal axis 19 the flat tubes 3 aligned. In 5 is the opening 18 circular, in 6 is the opening 18 elliptical, in 7 the opening is rectangular, in 8th the opening is triangular and in 9 is the opening 18 formed hexagonal. The opening 18 in 10 has an irregular shape.

Overall, with the inventive refrigerant capacitor assembly 1 significant benefits. In the deflection sections 15 of the manifold 5 are dazzles 16 built-in. At the apertures 16 is due to the size of the openings 18 reduces the flow cross-sectional area for the refrigerant, so that in the manifold 5 in the flow direction of the refrigerant after the panel 16 the refrigerant is swirled with the result of a uniform mixing of liquid and gaseous refrigerant. In the cooling pipes 2 thus flows from this section of the deflection 15 essentially a same mixture of liquid and gaseous refrigerant, so that a reduced cooling capacity due to cooling tubes 2 , which are predominantly charged with liquid refrigerant and thus condensation is not possible in this flow area 11 does not occur. Although occur due to the reduction of the flow cross-sectional area of the panel 16 locally higher flow losses, but nevertheless the cooling capacity can be increased, because the positive effects due to the increase of the cooling capacity outweigh the negative effects due to the locally higher flow losses.

LIST OF REFERENCE NUMBERS

1

Refrigerant condenser assembly

2

cooling pipe

3

flat tube

4

corrugated fin

5

manifold

6

Clippings

7

Closing device on the collecting container

8th

fastening device

9

inlet port

10

outlet

11

flow region

12

Header section

13

inlet section

14

outlet

15

deflecting

16

cover

17

partition wall

18

opening

19

longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0479775 B1 [0003]
• DE 69600580 T2 [0004]

Claims (10)

Refrigerant Condenser Assembly ( 1 ) for an automotive air conditioning system, comprising - cooling tubes ( 2 ) for passing a refrigerant, - the cooling tubes ( 2 ) into flow areas ( 11 ) with at least one cooling tube ( 2 ) are arranged, preferably at least two cooling tubes ( 2 ) of a flow area ( 11 ) are connected in parallel fluid-conducting, and the flow areas ( 11 ) are connected in series fluid-conducting, - two manifolds ( 5 ) for fluidly connecting the cooling tubes ( 2 ) with an inlet section ( 13 ) as a collecting pipe section ( 12 ) for introducing the coolant into a flow region ( 11 ), an outlet section ( 14 ) as a collecting pipe section ( 12 ) for discharging the coolant from a flow region ( 11 ) and at least one deflecting section ( 15 ) as a collecting pipe section ( 12 ) for diverting the refrigerant from a flow area ( 11 ) into another flow area ( 11 ), characterized in that in at least one collecting pipe section ( 12 ), in particular in the at least one deflection section ( 15 ), at least one aperture ( 16 ) is installed and the flow cross-sectional area for the refrigerant at the at least one aperture ( 16 ) is smaller than outside the at least one aperture ( 16 ) in the manifold ( 5 ). Refrigerant condenser assembly according to claim 1, characterized in that the ratio between the flow cross-sectional area at the at least one Blonde ( 16 ) and the flow cross-sectional area outside the at least one aperture ( 16 ) on the manifold ( 5 ) is between 0.9 and 0.2, for example between 0.8 and 0.4, preferably between 0.7 and 0.5, in particular between 0.65 and 0.55. Refrigerant capacitor assembly according to claim 1 or 2, characterized in that the at least one aperture ( 16 ) with respect to the axial extent of the manifold ( 5 ) between two flow areas ( 11 ) at the deflection section ( 15 ) in the manifold ( 5 ) is installed. Refrigerant capacitor assembly according to one or more of the preceding claims, characterized in that the at least one diaphragm ( 16 ) with respect to the axial extent of the manifold ( 5 ) at a distance to a fictitious dividing line between two flow areas ( 11 ) at the deflection section ( 15 ) in the manifold ( 5 ) is installed. Refrigerant capacitor assembly according to claim 4, characterized in that the at least one aperture ( 16 ) with respect to the axial extent of the manifold ( 5 ) at a distance of at least one, two, three, five, ten, twenty or thirty cooling tube widths to the fictitious parting line at the deflection section (FIG. 15 ) in the manifold ( 5 ) is installed. Refrigerant capacitor assembly according to one or more of the preceding claims, characterized in that the diaphragm ( 16 ) as a partition ( 17 ) with at least one, preferably only one, opening ( 18 ) is formed and in particular one of the partition ( 17 ) spanned fictitious plane substantially perpendicular to a longitudinal axis ( 19 ) of the manifold ( 5 ) is aligned. Refrigerant condenser assembly according to one or more of the preceding claims, characterized in that at the inlet portion ( 13 ) and / or at the outlet section ( 14 ) of the two headers ( 5 ) at least one aperture ( 16 ) is trained. Refrigerant condenser assembly according to claim 6 or 7, characterized in that the at least one opening ( 18 ) circular, elliptical, polygonal, in particular rectangular, z. B. square, or triangular, is formed. Refrigerant condenser assembly according to one or more of the preceding claims, characterized in that the refrigerant condenser assembly ( 1 ) a collecting container ( 6 ) with at least one overflow opening comprises by means of the collecting container ( 6 ) in fluid communication with the cooling tubes ( 2 ) and / or the manifold ( 5 ) stands. Automotive air conditioning system comprising - a refrigerant condenser assembly ( 1 ), - an evaporator, - a compressor, - preferably a blower, - preferably a housing for accommodating the blower and the evaporator, characterized in that the refrigerant condenser assembly ( 1 ) is formed according to one or more of the preceding claims.

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