WO2005088058A1

WO2005088058A1 - Airflow limiting device for a force-ventilated window

Info

Publication number: WO2005088058A1
Application number: PCT/EP2005/051023
Authority: WO
Inventors: Reinhard Herzog
Original assignee: Profine Gmbh
Priority date: 2004-03-12
Filing date: 2005-03-08
Publication date: 2005-09-22
Also published as: RU2006135930A; EP1727957B1; RU2374415C2; DE102004012644A1; EP1727957A1

Abstract

Devices for limiting the airflow of a force-ventilated window often operate with little precision, restricting the ventilation only when there are large differences in pressure, and generating a knocking or clicking noise when the ventilation flap is closed. In order to avoid these disadvantages, the inventive airflow limiting device for a force-ventilated window comprises a closing device for automatically opening and closing a ventilation path according to pressure difference, whereby a spring-elastic or flexible damping element, that is subjected to bending stress when the airflow limiting device is closed, damps the closing movement of the closing device. Said airflow limiting device especially comprises a ventilation flap that is mounted in such a way that it oscillates about a rotational axis and can assume an initial position in which the ventilation path is opened and a second position in which the ventilation path is closed. One of the abutment edges of the ventilation flap, located at a distance from the rotational axis, rests on an abutment surface in a sealing manner.

Description

Air flow limitation device for a ventilated window

The invention relates to a device for limiting the air flow of a forced ventilation window.

Technical field

The use of thermally insulated windows with improved joint tightness often leads, especially when used in damp rooms such as bathrooms and. Kitchens, to increased moisture damage such as mold, all, unless regular and adequate ventilation of the rooms can be ensured. A similar problem occurs in apartments with open gas heating or the like. on. It has therefore been proposed on various occasions to equip windows with forced ventilation, which ensures minimum ventilation of the rooms regardless of manipulation by the residents. At higher air pressure differences between the interior and exterior of the building due to high wind speeds, however, such forced ventilation leads to undesirably high volume flows of the exchanged air, which results in high energy loss and possibly. Cause drafts.

State of the art

There have already been various proposals for forced-ventilation windows which provide for a limitation of the air flow at higher pressure differences, see e.g. B. DE 102 40 290 AI and DE 298 18 312 UI.

DE 199 29 133 C2 relates to a plastic window made of sash and frame with a window rebate between an outer frame seal and an inner sash seal, air flowing between the sash and the frame from the outside to the inside and vice versa through the window fold. Here is in At least one rebate fan is provided for the window rebate, which has an air guide chamber and a volume flow limiter.

From DE 196 46 842 C2, a ventilation flap is known which is mounted in an oscillating manner in two side mountings and is mounted within the fitting groove of the lower horizontal casement.

The above-mentioned air flow limiting device for a forced-ventilated window generate an unpleasant knocking or rattling noise each time the ventilation flap is closed, which considerably reduces the comfort of such a device.

DE 196 10 428 C2 relates to a force-ventilated window with a frame, casement and a center seal. The seal has a first sealing lip, the upper end of which rests against a stop face of the frame or casement frame when the window is closed. Air passage openings are located in this first sealing lip. The seal also has a second sealing lip, which is elastic, freely movable when the window is closed and arranged at an acute angle to the first sealing lip so that when an ifo-determined differential pressure between the outside of the window and the inside of the window is exceeded, the air passage ö openings are at least partially closed. This solution does not produce any stop or rattling noise when closing, but the seal must be manufactured with very high precision in order to achieve a reproducible closing characteristic of the seal. In addition, this construction is not suitable for closing the air passage openings even at relatively low air pressure differences.

The object of the present invention is therefore to provide a device for limiting the air flow of a forced-ventilation window, which can be produced with little effort, precisely even with small pressure differences the ventilation throttles and at least largely suppresses a stop or rattling noise.

Presentation of the invention

The invention solves this problem by an air flow limiting device for a forced-ventilated window, with a closing device for the automatic opening and closing of a ventilation path depending on the pressure difference, characterized by a spring or soft-elastic damping element which is subjected to bending when the air flow limiting device is closed and dampens the closing movement of the closure device.

An air flow limiting device for a forced-ventilated window is preferably used, with a ventilation flap which is mounted so as to oscillate about an axis of rotation and which can assume a first basic position that releases a ventilation path and a second position that closes the ventilation path, with a stop edge of the ventilation flap spaced from the axis of rotation on one Stop surface comes to a sealing contact, the air flow limiting device having a spring or soft elastic, spaced apart from the stop surface damping element which is subjected to bending when closing the ventilation flap and thereby dampens the closing movement of the ventilation flap.

A force-ventilated window for the use of an air flow limiting device according to the invention preferably has a frame known from the art, composed of window frame profiles, and a corresponding window frame formed from window frame profiles. Frame profiles and casement profiles are preferably made of plastic, in particular hard PVC. However, other materials can be used without departing from the scope of the present invention. Frame profiles usually have a receiving groove for receiving a glazing bead in the rebate area on the room side. When using the window frame, the mounting groove serves as fixed glazing - ie without a sash - for mounting the glazing bead that holds the fixed glazing. When using the window frame together with a sash, i.e. without fixed glazing, this mounting groove is normally only used for mounting locking parts. According to a preferred development of the invention, the invention uses this receiving groove for fastening the air flow limiting device.

The force-ventilated window typically has a rebate chamber formed between the frame and casement, through which air can flow from the outside of the window to the inside of the room. The device according to the invention for limiting the air flow is provided in the upper horizontal fold area, this air flow limiting device preferably having a base body and a ventilation flap which is mounted in an oscillating manner in the base body. The base body has locking means with which it can be fastened in the receiving groove. Possibly. can also be attached by one or more screws.

According to a particularly preferred embodiment of the invention, the axis of rotation about which this ventilation flap can oscillate runs within the receiving groove for receiving a glass strip.

According to this particularly preferred embodiment, the device for air flow limitation is arranged in the rebate area of the closed window in such a way that the air flowing from the outside of the window to the room side is directed past the ventilation flap. When a defined flow velocity is exceeded, which is accompanied by a defined pressure difference between the outside of the window and the interior of the room, the ventilation flap, which is preferably held exclusively by gravity, is pivoted out of the rest position and initially strikes the spring or soft-elastic damping element according to the invention, before the ventilation flap is completely closed. When the ventilation flap is closed further, the spring or soft elastic damping element is subjected to bending and dampens the further closing movement of the closure device before it strikes a stop surface, as a result of which the further air supply is throttled or preferably at least largely interrupted. As long as the air pressure difference between the outside of the window and the inside of the room exceeds a defined amount, the ventilation flap remains in this "closed position". After falling below a certain differential pressure, the ventilation flap swivels back into the vertical rest position due to its own weight and thus releases the ventilation path again.

By choosing the length of the ventilation flap and its weight, as well as the angle of attack necessary to achieve the closing, the differential pressure, which the air flow limiting device limits or interrupts ventilation, can be set within wide ranges. The ventilation flap preferably has a straight, symmetrical cross-sectional shape without counterweights, etc. on .

It is a particular advantage of the preferred air flow limiting device described above that it can be designed such that the ventilation flap is in the "closed position" even at very low differential pressures, in particular 10 to 60 Pa, in particular 20 to 45 Pa "is deflected.

According to a further preferred embodiment of the invention, the base body has a stop surface against which the pendulum-mounted ventilation flap lies sealingly in the closed position. According to an alternative embodiment of the invention, the rebate-side surface of the wing stop chamber serves as a stop surface for the ventilation flap.

When the window is closed, the body of the air flow limiting device according to the invention is preferably sealed against the casement by a seal. According to a particularly preferred embodiment of the invention, this seal can be connected in one piece to the base body. The production is then preferably carried out in the two-component injection molding process known to the person skilled in the art.

According to a preferred embodiment of the invention, the spring-elastic or soft-elastic damping element used according to the invention consists of a particularly cylindrical, pin-shaped, soft-elastic material which only absorbs very small forces when subjected to bending. The cross-sectional area is preferably 0.5 to 2.5 mm ² , preferably 0.7 to 1.5 mm ^2, the length 2 to 15 mm, preferably 3 to 8 mm, and the Shore hardness 25 to 70, in particular 30 to 60 As a result, the closing movement of the closure device, in particular a pendulum-mounted ventilation flap, is damped to such an extent that it no longer produces any noticeable noise when struck against the base body, but without preventing the ventilation flap from closing completely. The damping element is preferably arranged such that the gap between the ventilation flap and the stop surface at the moment the ventilation flap first comes into contact with the damping element is approximately 0.3 to 1.2 mm, preferably 0.4 to 0.8 mm.

According to a preferred embodiment of the invention, the invention uses a special effect which can be observed when the ventilation flap is closed: when a certain pressure difference between the outside of the room and the inside of the room is exceeded, the flap begins - driven by the air flowing past - with its automatic closing movement. If the ventilation flap exceeds a certain closing angle, it is in an unstable state, which leads to an accelerated further closing of the ventilation flap. After the ventilation flap has been closed, the pressure difference must first decrease again somewhat until the ventilation flap is then suddenly opened completely (hysteresis). Insofar as the spring-elastic or soft-elastic damping element used according to the invention is set sufficiently soft, this hysteresis effect does not cause the ventilation flap even in the case of air pressure differences which are in the range of the critical air pressure difference when the ventilation flap is closed insists on an intermediate position, but is either largely opened or completely closed. Alternatively, the spring characteristic of the spring or soft-elastic damping element can also be selected such that the ventilation flap only closes gradually after the first contact with the damping element as the pressure difference increases. The flow cross-section then becomes smaller with increasing pressure difference, so that the air volume flow passing through can be kept approximately constant over a larger pressure difference until the ventilation flap closes completely when a certain pressure difference is exceeded.

Brief description of the drawing

The invention is explained in more detail below on the basis of an exemplary embodiment and the drawing. 1 shows a cross section through a window with an air flow limiting device according to the invention (open air passage); Fig. 2 is a window as in Figure 1 in the closed position of the air flow limiting device; 3 shows a perspective view of the air flow limiting device; FIG. 4 shows a cross section through the base body of the air flow limiting device; 5 Detail "A" according to FIG. 3, seen from the outside of the window;

6 shows a cross section through the air flow limiting device shortly before closing; 7 shows a cross section through the air flow limiting device in the closed position; 8 shows the test protocol of a forced ventilation window with an air flow limiting device according to the invention

Best way to carry out the invention

The forced ventilation Fe shown in Fig. 1 consists essentially of the frame 1, which is composed of bend frame profiles 2 made of hard PVC, the Flücjelrahmen 3, the is composed of the sash profiles 4, and the air flow limiting device 10.

The air flow limiting device 10 is shown in section in FIGS. 6 and 7. It consists essentially of the base body 11, which was injection molded from ABS, and the ventilation flap 12, which also consists of ABS. The base body 11, shown in Fig. 3 in a perspective view, has on its upper side the latching means 13 so that it can be clipped into the glass retaining strip on the groove 5 of the upper horizontal frame profile 2.

The ventilation flap 12 has a round bearing pin 21 on both ends, which serves as a suspension with the axis of rotation 15 in the base body 11. The ventilation flap 12 is thus freely movable between a vertical basic position (FIG. 1) and a "closed position" (FIGS. 2 and 7).

At air pressure differences between the outside of the window 8 and the side 9 of the room of less than 30 Pa, the air can, as indicated in Fig. 1 by corresponding arrows, from the folding chamber 7 through the between the ventilation flap 12 and the stop surface 16 of the base body 11 and a gap between the frame 1 and the stop chamber 6 of the casement flow into the interior 9 of the room. So that the fresh air can get into the rebate chamber 7 from the outside of the window 8, recesses in the outer stop seal 17 have been made in the area of the vertical sides of the window in a manner known per se to the person skilled in the art (not shown in the figures).

If the differential pressure between the outside of the window 8 and the side of the room 9 exceeds a value of approx. 30 Pa, the flowing air moves the ventilation flap 12, which is held in vertical position only by gravity, until it first hits the stop knobs 18 and then the stop surface 16 of the base body 11 (Fig. 3) strikes and thus seals the ventilation path. The stop knob 18, shown enlarged in FIG. 5, consists of an elastomer with a Shore A hardness of 40 and has a diameter of 1.2 mm and a free length of 4 mm. It is thus set so softly that it is subjected to bending when the ventilation flap 12 strikes (FIGS. 6, 7) until the flap 12 finally comes into sealing contact with the stop surface 16. The force with which the stop knob 18 acts on the ventilation flap 12 is so low that the flap initially remains in the closed position (FIG. 7) due to the air pressure difference between the outside 8 of the window and the side of the room 9 until the air pressure has dropped somewhat again. Nevertheless, the stop knob 18 dampens the closing movement of the ventilation flap 12 to such an extent that rattling noises are reliably suppressed.

In order to seal the base body 11 with respect to the casement 3 and to prevent air from flowing in between the base body 11 and the stop chamber 6, the base body 11 has a seal 14 on three sides. In the illustrated embodiment, this seal 14 is integrally connected to the base body (two-shot injection molding process). In the view from the room side 9, this seal 14 is U-shaped. In the area in which the base body 11 or the seal 14 touches the casement 3, the otherwise circumferential inner stop seal of the casement 3 is released.

The seal 14 is made from the same material as the stop knob 18, namely from a thermoplastic elastomer with a Shore hardness of 40. As can be seen in FIG. 3, the base body 11 of the air flow limiting device 10 has two on its side facing the room Spacers 19, which in turn have small knobs 20 made of flexible material on the room side. The stop chamber 6 of the casement 3 comes into contact with these knobs when the window is closed, the spacers 19 on the one hand ensuring a defined joint width between the frame 1 and the casement 3 and on the other hand the base body 11 the necessary Has rigidity to form a straight stop surface 16 for the ventilation flap 12.

As can be seen in FIG. 1, the axis of rotation 15 of the air flow limiting device 10 according to the invention is arranged such that, in the installed state (FIG. 1, FIG. 2), it is still inside the glass holding strip receiving groove 5, that is to say above the lower edge of the glass holding strip Recording groove 5, lies. When pivoting the ventilation flap 12 into the closed position (FIG. 2), the ventilation flap 12 just touches the lower edge of the receiving groove 5 on the room side, so that air flows in from the receiving groove 5 through the gap between this lower edge of the receiving groove 5 on the room side and the Ventilation flap 12 is largely avoided.

The window shown in FIGS. 1 and 2 with the dimensions 1.15 m by 1.40 m was equipped with two of the air flow limiting devices 10 in the upper horizontal spar and with respect to the air volume flow (“air loss”) as a function of the differential pressure between the outside of the window 8 and room side 9 measured. The result is shown in FIG. 8. At about 20 Pa pressure difference, marked "A" in Fig. 8, the ventilation flap 12 closes until the first contact with the stop knob 18. The geometry of the stop knob 18 together with its Shore hardness causes the pressure difference to gradually close the Ventilation flap 12 so that the volume flow remains almost constant at approx. 1 m ³ / h per m joint length over relatively wide ranges up to approximately 200 Pa. At about 200 Pa (point "B" in Fig. 1), the ventilation flap 12 is then completely closed. Legend

1. frame 2. frame profile 3. casement. Sash frame profile 5. Receiving groove 6. Stop chamber 7. Folding chamber 8. Window outside 9. Room side 10. Air flow limiting device 11. Base body 12. Ventilation flap 13. Locking device 14. Seal 15. Rotation axis 16. Stop face 17. External stop seal 18. Stop knobs 19. Spacers 20. Knobs 21. Bearing pin 22. Stop edge

Claims

claims

1. Air flow limiting device (10) for a forced-ventilated window, with a closing device for automatic, pressure-difference-dependent opening and closing of a ventilation path, characterized by a spring or soft-elastic damping element which takes up bending when the air flow limiting device (10) is closed and dampens the closing movement of the closure device.

2. Air flow limiting device (10) according to claim 1, with a swing flap mounted about an axis of rotation, which can assume a first, a ventilation path releasing basic position and a second position closing the ventilation path, wherein a spaced from the axis of rotation stop edge 22 of the ventilation flap (12) comes into sealing contact with a stop surface 16, characterized by a spring or soft-elastic damping element arranged at a distance from the stop surface 16, which is subjected to bending when the ventilation flap (12) is closed and the closing movement of the ventilation flap (12 ) dampens.

3. Air flow limiting device (10) according to claim 2 for attachment to a frame profile (2), characterized by the following features: - The air flow limiting device (10) has a base body (11) and one in the base body (11) about an axis of rotation (15) a swinging ventilation flap (12), the base body (11) having latching means (13) for fastening in a receiving groove (5) of the frame profile (2).

4. Air flow limiting device (10) according to claim 2 or 3, characterized in that the ventilation flap (12) has a straight symmetrical cross section. Air flow limiting device (10) according to one of the

Claims 3 or 4, characterized / that the

Base body (11) has a stop edge (16) against which the ventilation flap (12) strikes when the air flow is limited.