Insert for a collector profile of a condenser

In known collectors for condensers of motor vehicle air conditioners, the dryer cartridge is inserted from an upper end into the collector via a spacing rod. According to the invention, the dryer cartridge can be secured by releasable connecting means to the sealing lid, and the sealing lid can be mounted on the end associated with the flow segment of the collector profile.

BACKGROUND AND SUMMARY OF THE INVENTION 
This application claims the priority of German patent document 197 12 714.2 
filed Mar. 26, 1997, the disclosure of which is expressly incorporated by 
reference herein. 
The invention relates to an insert for a collector profile of a condenser 
of an air conditioner of a motor vehicle with a dryer cartridge, said 
cartridge being insertable into the collector profile axially from one 
end, relative to a lengthwise axis of the collector profile, said 
cartridge further being positionable in a flow segment of the collector 
profile, as well as a sealing lid to close off one end of the collector 
profile. 
A collector profile of a condenser of an air conditioner of a motor vehicle 
is known from German patent document DE 44 21 834 A1, said profile being 
closed off at a lower end by means of a bottom. An inlet opening as well 
as a return opening for the coolant, used in the condenser to be dried, is 
provided in a flow segment of the collector profile associated with the 
lower end. A dryer cartridge is also located in this lower portion, said 
cartridge forcibly guiding the coolant from the inlet opening through the 
dryer cartridge and to the return opening by means of an annular flange. 
The dryer cartridge is secured in the lower section of the collector 
profile by a spacing rod engaging the dryer cartridge, said rod extending 
through the collector profile up to an upper end of the collector profile 
and secured axially there by means of a sealing lid. The sealing lid can 
be screwed to this upper end of the collector profile by means of matching 
threads on the sealing lid and on the upper end of the collector profile, 
thus sealing off the interior of the collector profile. 
A goal of the invention is to provide an insert of the type generally 
described above having a dryer cartridge which can be handled and 
exchanged by simplified means. 
This and other goals have been achieved by providing an insert for a 
collector profile for a condenser of a motor vehicle air conditioner, 
comprising: a dryer cartridge which is insertable axially into the 
collector profile from one end, relative to a lengthwise axis of the 
collector profile, to be positioned in a flow segment at a first end of 
the collector profile; a sealing lid for sealing one end of the collector 
profile, said sealing lid being mountable on said first end of the 
collector profile; and a releasable connection between said dryer 
cartridge and said sealing lid. 
This and other goals have been achieved by providing an insert for a 
collector profile for a condenser of a motor vehicle air conditioner, 
comprising: a dryer cartridge which is insertable into the collector 
profile through an insertion opening; a sealing lid to close said 
insertion opening, wherein one of the dryer cartridge and the sealing lid 
comprises at least one male latching element and the other of the dryer 
cartridge and the sealing lid comprises at least one female latching 
element, said at least one male latching element being releasably 
engagable with said at least one female latching element. 
According to the invention, the dryer cartridge can be secured to the 
sealing lid by means of releasable connecting means, and the sealing lid 
can be placed on the end that faces the flow segment of the collector 
profile. Accordingly, the dryer cartridge can be easily replaced from the 
end of the collector profile that faces the flow segment. This end is the 
lower end in a condenser that is mounted vertically and therefore has a 
vertically positioned collector profile, so that the dryer cartridge can 
simply be replaced from below. 
Furthermore, the path to be traveled during insertion and removal is 
shorter, and therefore installation and removal take place more rapidly, 
so that replacement of the dryer cartridge is considerably simplified. 
With operation of the sealing lid and dryer cartridge from below, improved 
access is provided when mounting the cartridge and removing it directly on 
the motor vehicle. Since the dryer cartridge is secured directly to the 
sealing lid, no additional spacing rod is required. The fact that the 
spacing rod is no longer required creates a larger storage volume in the 
collector profile that is designed as a container, so that a filling 
valve, pressure sensor, or even a sight glass can be mounted. Since the 
dryer cartridge is secured releasably to the sealing lid, the dryer 
cartridge can simply be replaced when servicing is required without the 
sealing lid having to be replaced as well. Therefore, the sealing lid can 
be reused. 
According to certain preferred embodiments of the invention, the releasable 
connecting means comprise latching elements provided on the dryer 
cartridge or on the sealing lid, and matching latching locations are 
provided, said locations being associated with the sealing lid or the 
dryer cartridge and receiving the latching elements. The formwise latching 
connection thus created allows especially simple installation and removal 
of the dryer cartridge at the sealing lid. If both the dryer cartridge and 
the sealing lid are designed as plastic parts, the latching elements and 
latching locations can be molded integrally in simple fashion. 
In another embodiment of the invention, the side of the dryer cartridge 
that is opposite the releasable connecting means is provided with a 
receptacle to secure one end of the spacer supporting the collector 
profile, said end being opposite the flow segment. As a result, the dryer 
cartridges can also be used alternatively in known systems, in which they 
are inserted from above into the collector profile. 
In another embodiment of the invention, the end of the collector profile 
that is opposite the flow segment is made identical to the end facing the 
flow segment in such fashion that the sealing lid can be secured at either 
end. As a result, the sealing lid can be employed for both a design with a 
spacing rod and a design without a spacing rod. This creates a modular 
design for the sealing lid, and also a modular design for the dryer 
cartridge in conjunction with the embodiments described above. 
In another embodiment of the invention, the dryer cartridge is provided 
with an annular flange projecting radially outward for separating an 
inflow area and a return area in the flow segment of the collector 
profile, and the collector profile has an annular projection for axial 
support of the annular flange when the dryer cartridge is in the mounted 
position. In addition to the radial seal already known from the prior art, 
the annular flange thus is provided with an axial seal by virtue of its 
axial support on the annular projection. This produces an improved sealing 
effect between the inlet and return areas for the coolant. 
Other objects, advantages and novel features of the present invention will 
become apparent from the following detailed description of the invention 
when considered in conjunction with the accompanying drawings.

DETAILED DESCRIPTION OF THE DRAWINGS 
Referring to FIGS. 1 and 2, a condenser for an air conditioner of a motor 
vehicle has a tubular collector profile 1, connected laterally to a 
rib/tube block 20 which is aligned vertically when the condenser is 
mounted vertically. Collector profile 1 is connected in a manner not shown 
in greater detail by an inlet opening 21 and a return opening 22 with a 
collecting tube of the condenser. Collector profile 1 extends over the 
entire height of rib/tube block 20 and in the embodiment shown in FIG. 1 
has a closure 3 at its upper end 2, said closure sealing collector profile 
1 and being secured in collector profile 1 by hard soldering in 
particular. At a lower end 4 of collector profile 1, tubular collector 
profile 1 is sealed by a sealing lid 5 which is screwed into the lower end 
4 of collector profile 1. For this purpose, sealing lid 5 has an external 
thread 18 that engages a matching internal thread 19 in lower end 4 of 
collector profile 1. Sealing lid 5 has two annular grooves spaced axially 
with respect to one another, into which grooves O-rings can be inserted 
for sealing. 
To dry the coolant, a dryer cartridge 6 is inserted into a lower half of 
collector profile 1 that is defined as a flow segment by the inlet and 
return openings, said cartridge being provided with a filter screen with a 
preferred mesh size of 0.06 to 0.1 mm. Dryer cartridge 6 is made in the 
shape of a tube or sleeve and has a jacket perforated in the manner of a 
lattice, the interior of said jacket being lined by filter screen 7. A 
lower end of dryer cartridge 6 is sealed by a bottom, not described in 
greater detail. An upper end of dryer cartridge 6 is sealed by a sealing 
piston 8, said piston being subjected to axial pressure relative to the 
lengthwise axis of collector profile 1 and dryer cartridge 6 by a 
compression spring 9 abutting an upper supporting end 10. A granulated 
dryer filling is provided in dryer cartridge 6 and also inside filter 
screen 7, said filling being compactly compressed by sealing piston 8. 
An annular space is formed between the outer jacket of dryer cartridge 6 
and the inside wall of collector profile 1, said space serving to conduct 
the coolant. The annular space is thus divided by a radially outward 
projecting annular sealing flange 14 into an upper inlet chamber 12 in 
which the inlet opening terminates and a lower return chamber 13 from 
which the return opening branches off, with the outer circumference of 
said flange radially abutting the inside wall of collector profile 1. In 
addition, an annular projection 15 is provided on the inside wall of 
collector profile 1, said projection constituting a step that produces a 
smaller inside diameter. Sealing flange 14 also axially abuts this annular 
projection 15. Inlet chamber 12 is delimited axially at the top by an 
annular sealing shoulder 11, said shoulder likewise projecting radially 
outward from dryer cartridge 6 and radially abutting the inside wall of 
collector profile 1. The lower end of return chamber 13 is delimited by 
sealing lid 5. 
Dryer cartridge 6 has a plurality of latching noses 17 distributed like a 
crown around the circumference of dryer cartridge 6, said noses being 
designed to be elastically flexible in the radial direction. These 
latching noses 17 constitute the latching elements of a latching 
connection which serves for releasably securing dryer cartridge 6 to 
sealing lid 5. For this purpose, sealing lid 5 has a radial annular groove 
on its interior, said groove being designed as a latching location in the 
form of a latching groove 16. Latching groove 16 is adjusted to the 
dimensions of latching noses 17 in order to produce secure coaxial 
positioning and securing of dryer cartridge 6 to sealing lid 5. 
Alternatively, the latching noses may be provided on the sealing lid, with 
the annular groove being provided on the dryer cartridge. Sealing lid 5 is 
designed at the point where it axially abuts latching groove 16 in such 
fashion that a wedge-shaped annular space is formed around dryer cartridge 
6. This wedge-shaped annular space permits engagement of a tool, 
especially a screwdriver, to loosen dryer cartridge 6 from sealing lid 5. 
To insert dryer cartridge 6 into collector profile 1, sealing lid 5 is 
initially clipped by means of its latching groove 16 onto latching noses 
17 of dryer cartridge 6, so that dryer cartridge 6 and sealing lid 5 are 
firmly connected to one another. Then dryer cartridge 6 is inserted 
together with sealing lid 5 from lower end 4 into collector profile 1, 
with sealing shoulder 11 sliding axially along the inside wall of 
collector profile 1. When sealing lid 5 has been screwed on, sealing 
flange 14 abuts annular projection 15 axially, producing the radial and 
simultaneously axial seal described above. As a result, a secure 
separation between inlet chamber 12 and return chamber 13 is produced so 
that the coolant is forced to flow through dryer cartridge 6 and hence 
through the granulated dryer filling. 
Dryer cartridge 6 as shown in FIGS. 2 and 3 corresponds to dryer cartridge 
6 as described with reference to FIG. 1. In the embodiment shown in FIGS. 
2 and 3, however, dryer cartridge 6 is inserted from upper end 2 into 
collector profile 1. For this purpose, closure 3 is securely attached to 
lower end 4 of collector profile 1, preferably by soldering to collector 
profile 1. The upper end of dryer cartridge 6 defines a receptacle 28 in 
which a retaining disk 24 of a spacing rod 23 is secured releasably by 
means of a latching connection, with spacing rod 23 projecting upward out 
of dryer cartridge 6. Retaining disk 24 in the embodiment shown is 
provided instead of supporting end 10 shown in FIG. 1, so that it assumes 
the supporting function for compressing spring 9. Spacing rod 23 has guide 
elements 25 projecting radially outward approximately halfway along its 
length, said elements radially abutting the inside wall of collector 
profile 1 and ensuring secure centering of spacing rod 23 over its length. 
A free end 26 of spacing rod 23, in the installed position, abuts a plane 
supporting surface 27 of sealing lid 5, said lid being screwed into the 
upper end 2 of collector profile 1 in the embodiment shown in FIGS. 2 and 
3. For this purpose, upper end 2 of collector profile 1 is also provided 
with a matching internal thread. 
Retaining disk 24 of spacing rod 23 is connected integrally with spacing 
rod 23. As soon as sealing lid 5 has been screwed completely into upper 
end 2, it exerts an axial pressure on free end 26 of spacing rod 23, said 
pressure being transmitted to compression spring 9 and hence to sealing 
piston 8 by spacing rod 23. As a result, secure and compact positioning of 
spacing rod 23 and dryer cartridge 6 within collector profile 1 is 
achieved. 
An shown in FIG. 4, the latching noes 17 may be provided an the sealing 
lid, with the corresponding latching groove 16 being provided in the dryer 
cartridge Of course, one of ordinary skill in the art would understand 
that any type of latching elements which are known in the art could be 
used, and accordingly the invention is not to be limited to the specific 
male-female type latching elements shown in the drawings. 
The foregoing disclosure has been set forth merely to illustrate the 
invention and is not intended to be limiting. Since, modifications of the 
disclosed embodiments incorporating the spirit and substance of the 
invention may occur to persons skilled in the art, the invention should be 
construed to include everything within the scope of the appended claims 
and equivalents thereof.