VENTILATION DEVICE WITH SELF-REGULATING AUXILIARY VALVE AND BYPASSAGE

Description

-2- behind the auxiliary valve no negative pressure forms relative to the ventilation passage. Consequently, the auxiliary valve can rotate freely as needed by the airflow through the ventilation passage. The bypass passage ensures pressure equalization between both sides of the auxiliary valve, which favorably influences its operation.5 In practice, however, it appears that this ventilation device does not optimally prevent the phenomenon of rattling / swaying. In addition, the presence of the bypass passage can cause additional noise nuisance, e.g. whistling tones. Purpose of the Invention10 The present inventions and the preferred forms of implementation thereof aim to provide a solution for one or more of the aforementioned disadvantages. A purpose of the invention may therefore be to provide a ventilation device with a self-regulating valve of the aforementioned type that prevents noise nuisance. 15 Description of the Invention According to the invention, this goal is achieved by a system that exhibits the technical characteristics of one of the independent claims.To this end, the present invention concerns a circulating passage extending along the center of the hinge between the ventilation passages and the area adjacent to the side of the auxiliary valve facing away from the ventilation passage. In a first aspect of the invention, which may occur in combination with the other aspects and forms of execution of the invention described herein, the invention comprises a ventilation device for installation in the facade of a building. A sum is determined by the minimum dimension of the bypass passages and the minimum dimension of the ventilation passage near the auxiliary valve, where the ratio between the sum in a 'closed' state, when the auxiliary valve maximally closes off the ventilation passage, and the sum in a 'rest' state, when the auxiliary valve is at rest, is greater than approximately 0.15 and less than approximately 0.75. In the rest state, the ratio of the minimum dimension of the bypass passages and the sum is greater than approximately 0.1 and less than approximately 0.3. In the closed state, the ratio of the minimum dimension of the bypass passages and the sum is greater than approximately 0.25 and BE2025 / 7090 -3- smaller than approximately 0.7. The inventors in question have found that with these ratios the right compromise is found between, on the one hand, good pressure equalization between both sides of the auxiliary valves and, on the other hand, minimal noise nuisance. If the circulation passage is smaller, then one may experience noise nuisance. If the circulation passage is larger, then operation will be compromised in the event of strong airflow. With these ratios, the airflow is optimally distributed between the circulation passages and the ventilation passage in both the open and closed states. In one execution form, which can occur in combination with the other aspects and execution forms of the invention described herein, concerns a aforementioned ventilation device, where the ratio of the minimum dimension of the circulation passages and the sum is less than 0.3 in the idle state and greater than 0.3 in the closed state.In a form of execution which may occur in combination with the other aspects and forms of execution of the invention described herein, concerns a aforementioned ventilation device, where the minimum dimension of the circulation passage in the closed state is equal to or different from the minimum dimension of the circulation passage in the resting state. In a form of execution which may occur in combination with the other aspects and forms of execution of the invention described herein, concerns a aforementioned ventilation device, where the minimum dimension of the circulation passage is greater than 1 mm, preferably greater than 2 mm. In a form of execution which may occur in combination with the other aspects and forms of execution of the invention described herein, concerns a aforementioned ventilation device, where the sum is greater than 2 mm, preferably greater than 3 mm, or preferably greater than 4 mm. The bypass can be created in various ways.According to a first possibility, the hinge center of the auxiliary valve can be air-permeable for this purpose. The traditional hinge center, on the other hand, comprises a continuous sealing bead / groove connection, which is virtually airtight. A possible version of such an air-permeable design is mentioned in which the hinge center of the auxiliary valve is interrupted in the longitudinal direction of the housing. BE2025 / 7090 -4- Through this interruption, a bypass passage is created that is sufficiently large to provide the desired effect. In this context, the hinge center can comprise holders placed at a distance from each other at the end of the longitudinal direction of the housing. In this case, the auxiliary valve can comprise an auxiliary valve profile that possesses a beaded edge, which beaded edge is incorporated into correspondingly shaped hinge recesses of the holders. Optionally, the holders may possess stops to determine the maximum angular rotations of the auxiliary valve.Preferably, the housing comprises at least a base profile provided with a wall which has punched-out recesses, which recesses are separated by dams10 that bridge the ventilation passage and which holders are clicked onto opposite edges of the recesses. The holders may each comprise a support that is clicked between the opposite edges, and an arm protruding relative to the support in which the hinge recess is formed. 15 Brief Description of the Figures The invention will be further clarified below by means of an example of execution shown in the drawing. Figure 1 shows a cross-section through a ventilation device according to the invention with the self-regulating valve at rest;20 Figure 2 shows the ventilation device shown in Figure 1 with the self-regulating valve in the maximally closed state; and Figure 3 shows a longitudinal section through the ventilation device shown in Figure 1 viewed from the front.25 Detailed Description of the Figures The present invention will be described with respect to certain embodiments and with reference to certain drawings, but the invention is not limited thereto and is defined only by the claims. The described drawings are merely schematic and not restrictive. In the drawings, the size of certain elements may be exaggerated and not drawn to scale for illustrative purposes. The dimensions and relative dimensions do not necessarily correspond to actual practical implementations of the invention. Furthermore, the terms first, second, third and similar embodiments are used in the claims to distinguish between similar elements and not necessarily to describe a sequential or chronological order. The terms are interchangeable under appropriate circumstances and embodiments of the invention may be applied in sequences other than those described or illustrated herein.Moreover, the terms at the top, bottom, over, under, and similar end descriptions and conclusions are used for illustrative purposes and not necessarily to describe relative positions. The terms thus used are interchangeable under appropriate circumstances, and the forms of execution of the invention described herein may be applied in orientations other than those described or illustrated herein. Furthermore, the various forms of execution, although referred to as “preferred forms”, should be understood rather as examples of how the invention can be executed than as a limitation of the scope of the invention. The term “comprehensive”, used in the conclusions, should not be interpreted as being limited to the means or steps mentioned below; the term does not exclude other elements or steps.The term should be interpreted as specifying the presence of the mentioned characteristics, elements, steps or components referred to, but does not exclude the presence or addition of one or more other characteristics, elements, steps or components, or groups thereof. The scope of the expression “means A and B comprising a device” should therefore not be restricted to devices consisting solely of components A and B. The meaning is that, with respect to the present invention, only the components A and B of the device are listed, and the conclusion should further be interpreted as meaning that it also contains equivalents of these components. The ventilation device shown in Figure 1, in accordance with the invention, comprises a housing1 containing a ventilation passage2 running from an inlet3 to an outlet4. The housing consists of a first profile5 and a second profile6, which are connected to each other by means of a mechanical click connection7. BE2025 / 7090 -6- In the second profile6, an adjustable valve8 is suspended in the known manner.The associated control mechanisms are not shown in the figures. A self-regulating auxiliary valve 9 is placed near the inlet 3. In the resting position, as shown in Figure 1, this auxiliary valve 9 is almost completely open. When the airflow from the inlet 3 to the outlet 4 increases, the auxiliary valve 9 moves automatically to a closed position, see Figure 2. This mechanism is made possible by the pressure differences created in the ventilation passage 2. The auxiliary valve9 has a ventilation flow side10 and a slanted side11. The suspension of the auxiliary valve is provided by several spaced-apart holders12. Each holder12 consists of a support13, which is attached with a click connection in the recesses14 of profile5. These recesses14 are obtained by punching out the wall15, leaving narrow spacers, or dams16, for strength. The supports13 are clicked firmly between the bottom edge17 and top edge18 of the recesses14. As can be seen in figures 1 and 2, an arm19 is attached to each support13.This arm15 contains a hinge recess20, into which the bead rim21 of the auxiliary valve9 fits. The hinge construction allowed for free rotation of the auxiliary valve9. Between the arms19 there is a free-flow passage22, above the bead rim21. Air can continue to flow through this flow passage22, as indicated by the arrow i.