The present invention relates to aventilator with heat exchanger for heat recovering, in pa'rticular for recovering of heat from a flowing medium, such as a gaseous flowing medium, and transferring this heat toanother colder flowing medium, such as a gaseous flowing medium.

It is known to the art to construct such ventilators with heat recovering. Normally, they are made in such a way that an effective heat exchanger of some inή beingadaptable to the kinds of flowing media, is used and in that two venti¬ lators are being comprised beingarranged suitably with one of them in each of the flows of flowing media suitably able to drive the two flowing media.

In this manner satisfactory functioning embodiments can be constructed, but, on the other hand they are corre¬ spondingly space demanding and are correspondingly costly to be provided.

It is a purpose according to the present invention to provide a heat recovering ventilator which may be installed in a common through-opening for the two flowing meadia, as for instance in a through-opening through a wall, andwhere¬ by it is possible to use only one single ventilator for a simultaneously driving of the two flowing media. Further¬ more, it is wanted, possibly, to achieve a low acoustic noise level from the running ventilator, in which case the first flowing medium for instance may be heated airto be expelled from a living room, from a workshop, from a stable, etc, while the other flowing medium is cold fresh air to be led into these rooms from outside, and which air is wanted heated with the heat from the firstof the flowing media that is tobe ledaway from these rooms. Furthermore, it has to be easy to exchange, if necessary, air filtersbeing provided in the heat recovering ventilator, and also it should be easy to carry out any necessary maintenance.

This has resulted according to the invention in the providing of a heat recovering ventilator of the firstmen¬ tioned kind in that it comprises a heat exchanger for the exchanging ofheat betweenthe two flowing media, whereby the exit for the first flowing medium from the heat exchanger is arranged neighbouring, preferably coaxially, to its entrance for the second in opposite direction flowing me¬ dium, whereby the flowing media in the said, preferably coaxial, arrangement are led through a ventilator co pri- sing an on acommon shaft and with a, preferably co-rotating, partition provided double rotor, whereby these two thus separated rotors each drives one of the two flowing media through the heat recovering ventilator.

By means of this embodiments can be provided compri- sing simple guiding means toguide the two flowing media in the vicinity of the driving ventilator, and which dri¬ ving ventilator thus is one and the same for the twoflowing media which thus can be led for instance through one and the same opening in a wall. Because according to the invention the two rotors are cylinder shaped and are driving the two flowing media inthe same direction through the two rotors a more calm operating ventilator is attained, and furthermore, in a rather simple manner it is possible to arrange guiding means which sepa- rated from each other are able to guide the two flows ofme¬ dia, being driven by the ventilator, through the rotors which belong to the double"rotor that is commonto the two flowing media, and which rotors are the"means driving the two flows of flowing media. Furthermore, according to the invention an advantageous structure is attained, and this is in par¬ ticular the case when the heat exchanger is of the kind comprising a number of substantially in parallel with the axis of the cylinder and between cylindric bottom means running tubes which at one of the ends through one or more guiding means are supplied with the first flowing medium which medium at the tube exit orifices

by means of suitable guiding or possibly without suc guiding means from the heat exchanger is led to the rotor of the ventilator serving to drive this first flowingmedium away from the heat exchanger, and whereby over a suitable portion of its length the heat exchanger is covered by a cylindric shaped cover which preferably covers the portion of the heat exchanger being most remote from the exit endof it with a cover having a smaller diameter and thus being more close to the heat exchanger, and whereby within a for the purpose suitable vicinity of the ventilator guiding means are positioned serving to lead the second flowing medium arriving from the other rotor of the ventilator into the heat exchanger in between the external sides of the tubes which as said run substantially in parallel with the axis of the cylinder, and whereby at the in relation hereto second exit of the heat exchanger, such as at the relatively opposite end of the heat exchanger, guiding means are positioned serving to a conducting away to the user of the flowing medium being provided from the heat exchanger.

In this manner a suitably compact structure has been achieved which it is possible to build into or install in a fairly simple manner within a single through-opening in a wall. A correspondigly good separation of the two flowing media isherethrough attainedaccording tothe inventinat the room side when being used according to the invention when the heat exchanger tubes are arranged in a circular shaped zone positioned suitably remote from the axis of the heat exchanger, and when at the relative to the ventilator oppo- site end of the heat exchanger a mushroom shaped guiding means is present, of which the stem through-going is hollow and serves to pass the second flowing medium.

The employed elements can in a structurally simple manner be put in place and the single elements are easily accessible for instance through a simple mutual pulling-out

of the single elements, and whereby only few elements or means are required for the holding together of the joined elements. This is thus achievable according to the inven¬ tion when the guiding means are composed of a cylindric means that simultaneously carries the drive motor support for the ventilator, and in that the guiding means comprise openings for the said flowing media, and in that the guiding means in the spacing between the cylindric shaped means and the outer cover for the ventilator comprise partitionlike guiding means and spacing providing means.

It has to be added that the heat recovering ventilator has shown itself well suited for this purpose, and these features are described in closer details as follows.

Embodiments according to the invention are described in more details as follows under reference to the drawing in which:

Fig 1 illustrates a longitudinal cut through an embo¬ diment according to the invention of a heat re¬ covering ventilator being installed in a through-opening in a wall 12,

Fig 2 illustrates in the perspective a heat recove¬ ring ventilator ready to be installed in a wall and being an embodiment of the heat recovering ventilator shown in longitudinal cut in Fig 1 , Fig 3 shows in the perspective a within an angle of

90 degrees rotary damper means serving to en¬ able an external closing of the ventilator, Fig 4A illustrates in the perspective drive motor means able to drive the damper means according to Fig 3 and the ventilator double rotor according to

Fig 4B, Fig 4B shows in the perspective a double rotor able to drive flowing media I and II , Fig 5 illustrates a cover means which belong to the heat recovering ventilator according to Fig 2,

Fig 6Aillustrates in the perspective a cylindric shaped means arrangeable as an insertion sup¬ porting the drive motor support and guiding means for the flowing media in vicinity of the double rotor.

Fig 6B shows in the perspective an end wall ring means to be inserted atthe doublerotor atthe cylindric means according to Fig 6A, Fig 7 illustrates partly in the perspective an em- bodiment of a heat exchanger being part of the heat recovering ventilator according to Fig 2, Fig 8 shows in the perspective and partly in cut the heat exchanger according to Fig 7 viewed in the opposite direction, Fig 9 illustrates in the perspective a right guiding means to be positioned at the right hand side of the heat exchanger according to Fig 7, and Fig 10 illustrates in the perspective and in exploded view the heat recovering ventilator according to Fig 2.

An embodiment according to the invention of a heat re¬ covering ventilator is shown in the drawing, the illustra¬ ted embodiment provides features by means ofwhich the single advantages according to the invention present themselves. The, as only an example illustrated, embodiment of a heat recovering ventilator according to the invention is foreseen able to be installed within an opening in a wall 12 shown in Fig 1. At the right hand side of the wall may for instance be found a heated room, while at the left hand side of the wall 12 the heat recovering ventilator.protru¬ des out into the space with free air. The ventilator sucks used air from the heated room and away from it as a first flowing medium I being expelled into the free air space, while oppositely, fresh and colder air II as asecond flowing medium II by means of the ventilator is suck into the room

substituting the expelled air I. The heat recovering venti¬ lator according to the invention simultaneously provides a heat transfer between the flowing media I and II so that heat from the heated flowing medium I is transferred to the flowing medium II, i.e. that energy saving the fresh air which is suck or blown into the room is heated by heat supplied by the flowing medium being expelled.

To achieve a suitable separation betweenthe two flowing media suitable inwards-sucking and outwards-expelling flow- conditions are arranged at both ends of the heat recovering ventilator so that a mixing of the flowing media is avoided in the close vicinity of the ventilator. At the one end in the heated room such a guiding means 6 is for instance po¬ sitioned that the flowing medium II is suck-in fresh air which arrives via the central range, while used air, i.e. air to be expelled, from the heated room is suck out at the periferal range of the ventilator as flowing medium I . Re¬ versed, fresh air via the periferal range of the ventilator is suck-in at the free-space-end of the ventilator as the flowing medium II, while the used air, i.e. air to be ex¬ pelled, from the heated room is going to leave the ventila¬ tor at the free-space-end of the ventilator, i.e. at the central range of the ventilator, as the flowing medium I. At the free-space-end the ventilator comprises a rotary damper means 70 which is adapted to be able to be mounted on a shaft 87A positioned on a separat drive motor 87. The damper means 70 is able to be rotated in both di¬ rections within an angle of for instance 90 degrees, here- through providing two damper means positions, one in which protruding vane portions on the damper means 70 and cylin¬ dric vanes 73 close the periferal expelling passage through an opening 35 for the flowing medium II and_.close for the entrance of the flowing medium I through openings 32 and33, else they are open. Flowing medium I is suck-in at 1 from the heated room

and via tubes 5 in the heat exchanger in which the tubes 5 are arranged substantially mutually in parallel and being mutually equally spaced with the flowing medium II to be described as follows located in the spacing. At the other end of the tubes 5 which in Fig 1 , Fig 2 and Fig 7 is shown as the left hand end and in Fig 8 as the right hand end the flowing medium I flows furtheron via the exit 2 from the heat exchanger into the central range of the illustrated rotor 81 and furtheron through this rotor 81 through ope- nings 35 which are shown in Fig 6A and passing spacing pro¬ viding means 38 and passing furtheron to the left according to Fig 1 and Fig 2 out into the free-air-space. In one of the positions for the rotary damper means 70 the protruding vanes of the damper means are able to close the pathway be- tween the openings 35 and the free-air-space. In this manner unnecessary draught through the ventilator is avoided when the ventilator halts.

The damper means is rotated by means of a drive motor 87 as mentioned above. An end stop means 700 is arranged on the means illustrated in Fig 6A and serves to achieve a to and fro control of the movements of the damper means, to this purpose the means 700 for instance may be a suitable electric switch means.

To provide an understanding of the flow ways of the flowing media I and II through the heat recovering ventila¬ tor a reference may be made to Fig 1 and Fig 6A of the drawing. A longitudinal cut through the ventilator is illu¬ strated in Fig 1 which longitudinal cut according to Fig 1 is passing through a means which is the cylindric means shown in Fig 6A as the portion Q-Q of the cut according to Fig 1, i.e. on the illustrated side of guiding meansportion 34 shown in Fig 6A. Flows which are passing through ranges ^" laying outside the illustrated cutare shown in Fig 1 in dotted lines at top and bottom of the cylindric means even though these flows pass outside these ranges. The same applies

correspondingly for guiding means which are running higher and lower which guiding means are shown in more dotted dot¬ ted lines, such means are those as the guiding means 37 and 39 being crosswise arranged in relation to the longitudinal flow of the flowing medium I. In Fig 6A the factual flow ways for the flowing media I and II are shown by means of corresponding lines, i.e. in dotted line forthe flowingmedium I and by means of a full line for the flowing medium II .

It is thus to be understood that the flow path for the flowing medium II runs radially inwards directed through for instance two in Fig 5 illustrated plates 100 with gill slots and through openings 33 shown in Fig 6A and furtheron into the central range of the rotor 811 belonging to the ventilator 8 and from there driven outwards through the periferal portion of this ventilator rotor through openings 32 and between guiding means 31 and 34 and through the periferal portion around the heat exchanger and in oblique direction downwards along the external sides of the tubes 5 and inbetween these to the mid-range of the heat exchanger and outwards towards and into the heated room through a filter 41 from the tube 4.

The vanes 73 of the damper means close, when they are rotated to occupy the closed position of the damper means, the said flow path passing through the openings 33 at the internal sides of these openings.

It is to be understood that it is possible to connect further lengths of tubes for the flowing medium II to the mushroom shaped guiding means body 6 and for instance guide the flowing medium II as fresh air from the free spece to any more definite place or spot where work is carried out in the heated room or to any other kind of distributing system, etc.

Within the heat exchanger a heat exchange between the flowing media I and II takes place when the tubes 5 aremade of a suitable heat conducting material, whereby the warmer

flowing medium supplies heat to the colder flowing medium. Per se a heat exchange may take place mutually in both di¬ rections between the flowing media. In the present case it is foreseen that the flowing medium I is the warmest of the two flowing media.

In practice experiments have shown that the substantial portion of heat being present in the used air which is being expelled through the ventilator can be recovered and can reenter into the living room by means of a ventilator being embodied as described herethrough, and this takes place without the generation of inconvenient draught accor¬ ding to the experiments carried out in practice.

At an embodiment of a heat recovering ventilator ac¬ cording hereto it has shown itself effective when the tubes 5 consist of thin tubes made of plastic. Herethrough, also the weight of the ventilator becomes low. An internal dia¬ meter of the tubes of a few millimeters suffices.

When the rotor of the ventilator is made of electric conducting material it is easily understood that the inwards flowing medium II is going to have the same static potential as the flowing medium I being led away. Herethrough, it is attained that the in-door climate after longer time of ope¬ ration of the heat recovering ventilator is not influenced in an adverse manner static electrically by the running ventilator.

Of the shown embodiment of the ventilator it is also easily understood that for instance the filter 41 and the heat exchanger with the tubes 5 each of them may be shaped as units able to be pulled out. In this respect it may be advantageous if the heat exchanger is somewhat conically shaped having the smallest diameter hereof positioned clo¬ sest to the ventilator 8 whereby it rather easy may be pulled out for possible cleaning in case the passing air after a time of operation pollutes these portions which are the portions most apt to be dirty with time. The remaining

portion of the ventilator may also be shaped permitting a pulling-out of the units. The units may be kept in place by means of small permanent magnets being positioned suitably according to the purpose. Such permanent magnets which are not illustrated may besides between the filter 41 and the tube 4 be located between the heat exchanger unit and the element shown in Fig 6A, and also between this and the cover element shown in Fig 5 respectively towards the ven¬ tilator unit. To avoid unauthorized disassembling of the ventilator such permanent magnets may be furthermore supplemented by, wholly or in part, further joining means or elements, such as screws, nuts, clamps, etc.

The embodiment which is described and illustrated has in practice shown itself to be able to operate rather noiseless.