DE8711956U1 - Filtration device for cooling circuits - Google Patents

Description

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The subject of the innovation is a filtering device for cooling circuits, in particular * but not exclusively,
for the cooling circuits of air conditioning systems*

In cooling circuits, the use of a filter is known _to retain impurities and the water present in the coolant,

It is also necessary to display the moisture content of the coolant after it has flowed through the filter.

If the cooling circuit is to be space-saving, for example when used in the field of air conditioning systems for vehicle interiors, it is advisable that the humidity indicator neither leads to difficulties in the design, operation and assembly of the cooling circuit nor to an increase in its space requirements.

The innovation is therefore based on the task of solving the problems mentioned above.

To solve this problem, the innovation proposes a filtering device for cooling circuits, which has a hollow body with inlet and outlet connection, which accommodates a drainage and filtering unit for retaining the impurities and the water present in the coolant, wherein the outlet connection is connected to an inner channel arranged after the filtering unit, characterized in that in the area of the inner channel an externally visible display of the moisture content
of the coolant.

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The innovation is described in more detail below using an example shown in the attached drawing. It shows:

Fig. 1 is a longitudinal section of an innovative filter device and

Fig. 2 is a top view of the device of Fig _{. s} L

The filtering device designated 10 has a generally cylindrical hollow body 11. A head 12 is inserted into the hollow body 11 at one end _, while an inlet connection 13 with an inlet channel 13 is inserted at the side.

The hollow body 11 accommodates a tube 14 which runs from one end of the body to the other in axial sealing of the same. In particular, the tube 14 is inserted at one end into the head 12, while at the other end it opens into the area of the end of the body 11 opposite the head 12.

Always at the last-mentioned end, a container 15 with a perforated (17) bottom 16 is attached to the body 11. Inside the container 15, in the middle, a bushing 18 is attached, in which the end section of the tube 14 is arranged.

The container 15 accommodates a series of elements arranged one above the other, namely, starting from the perforated bottom 17: a net-like element 19, a first felt 20, a molecular sieve 21, a second felt 22 and a disk 23 with holes 24. All elements

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Are pressed against each other by a spring 25, which acts on the perforated disk 23 and acts against an annular projection 26 of the tube 14*

A sealing ring 37 is arranged between the container 15 and the wall of the body 11". The container 15 and the elements contained therein represent the actual filter of the filtering device 10.

In the head 12, an axial channel 27 is made which is aligned with the tube 14 and is connected to the tube 14. A channel 28 extends from the channel 27 in the transverse direction and continues into the outlet channel 29A of an outlet connection 29 inserted in the head 12.

The channel 27 also opens into a cavity 30 of the head 12. A plug 31 is screwed into the cavity 30, which has a central through-hole 32.

The bore 32 accommodates an annular display element 33 made of a material that changes color depending on the moisture content of the medium that comes into contact with it. The element 33 is arranged between a transparent element 34 that closes the bore 32 to the outside and a retaining ring 35 driven into the bore 32 that holds the display element 33 against the transparent element 34.

The filter device 10 is designed to be used in a cooling circuit. The connections to the cooling circuit are made via connections 13 and 29.

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The coolant flows through the ISA channel into the Kasper

11 and stretched through the perforated disc 23,- derit

Felt 22, the molecular sieve 21, the felt 20, the net-like element 19 to the perforated bottom 17* During the

!5 flow, the water contained in the coolant is

the molecular sieve 21 according to a known technique

k jsurückgehaiterii The thus dewatered coolant flows

enters the pipe 14 and passes through it to the channel 27 to flow out of the filter device through the channels 28 and 29A. A part of the dewatered coolant fills the cavity 30*

The distance traveled by the coolant described above is shown by arrows in Fig. 1.

The coolant in the cavity 30 comes into contact with the indicator 33, the color of which will change depending on the moisture content of the medium.

The operator can therefore check the moisture content through the transparent element 34 from the outside and determine the moisture content in the cooling circuit based on the color of the display 33.

This allows the functions of draining the coolant and controlling the moisture content of the cooling circuit to be combined in a single device.

The resulting advantages are on the H.;-.*.

. The device 10 has the dimensions of a conventional filter device without display of the moisture content

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and approximately the same weight, since the display is built into the connection head of the device. Compared to the known devices, there are therefore no problems of weight and size increases.

Since it is a single component rather than two parts, assembly of the cooling circuit is made much easier. In addition, the cooling circuit itself is more reliable, since the possibility of coolant leakage is proportional to the number of connecting parts (mechanical and/or welded connections). Another advantage is the smaller number of components in the cooling circuit, which corresponds to fewer inventories, easier component management, etc.

Thanks to the ring shape of the indicator 33, the operator can see the coolant from the outside (through the transparent element 34 and the central hole of the element 33), which is particularly advantageous when recharging the cooling circuit. As is known, the operator can deduce the charging conditions of the cooling circuit by observing the presence of bubbles in the coolant in the liquid state.

Coloured areas 36 can be attached to the plug 31, each having a different colour corresponding to one of the two colours acceptable to the display 33. Each area then carries an indication which enables the operator to display the moisture content to which the colour of the area in question corresponds .

Of course, the elements described above, and in particular the display element, may have other shapes.

The inlet and outlet connections 13 and 29 can be arranged differently, for example the connection 13 can also be arranged on the head 12. Auxiliary connections can be arranged on the head 12.

The arrangement of the moisture content indicator shown is practical and functional. In any case, equivalent arrangements are possible that are visible from the outside and are always located in the area of the channel after the actual filter. For example, the indicator element could be installed in the body of the filter device in such a way that it is always in contact with the dehydrated coolant and is visible from the outside.

Claims (9)

Patent attorneys:· : ::-:';:' Dipl.-Ing. Curt Wallach European patent representative DIpl.-Ing. Günther Koch European Patent Attorneys Dipl.-Phys. Dr.Tino Haibach Dipl.-Ing. Rainer Feldkamp D-8000 Munich 2 · Kaufingerstrasse 8 · Telephone (0 89) 2 60 80 78 ■ Telex 5 29 513 wakai d G 87 11 956.0 ^Date: 6 October 1987 KENMORE ITALIANA S.p.A. Our reference: 18 638 - K/Ap Filtration device for cooling circuits Protection claims: 1. Filtration device for cooling circuits with a hollow body with inlet and outlet connection, which accommodates a drainage and filtration unit for retaining the impurities and the water present in the coolant, whereby the outlet connection is connected to a ! neten Inneukanal is connected, characterized in that in the region of the inner channel (27) an externally visible indicator (33) of the moisture content is arranged. 2. Filter device according to claim 1, characterized in that it has an outer connection head (12) connected to the hollow body (11) and having at least one outlet (29) in which the moisture content indicator (33) is installed. 3. Filter device according to claim 2, characterized in that a cavity (30) is formed in the head (12) which is connected to the inner channel (27) receiving the display (33). ti i I i 4 i » ti UM II Il «14 114 Il I I· t i * * fill III tr* «&agr; 4. Filter device according to claim 3, characterized in that the cavity (30) is connected to the outside via a transparent closing element (34), in the area of which the element forming the display (33) is arranged, which changes color depending on the moisture content of the coolant. 5. Filtering device according to claim 4, characterized in that the display element (33) is annular, so that the coolant is visible through the central bore (32) of the ring (35) and the transparent element (34). 6. Filter device according to claim 4 or 5, characterized in that the display element (33) is held against the transparent element (34) by a holding element (35). 7. Filter device according to one of claims 4, 5, 6, characterized in that the transparent element (34) is installed in a plug (31) which closes the cavity (30). 8. Filter device according to claim 7, with a moisture color scale which allows the moisture content to be identified by comparing the color with the display, characterized in that the moisture color scale (36) is arranged on the plug (31). 9. Filter device according to claim 1, characterized in that the display consists of an element (33) which is visible from the outside through a window (34) and changes colour depending on the moisture content of the coolant. tt 4 I 4 t