ADJUSTMENT AND LOCKING MEANS FOR A DAMPER PLATE OF A VENTILATION DEVICE

Abstract

 An adjustment and locking means for a damper plate of a ventilation device, by the aid of which means the damper plate, or the like, of the ventilation device is adjusted, which damper plate is connected by the aid of a cable, wire, or the like, to the regulator slide (1) of the adjustment and locking means. The invention is implemented in such a way that the adjustment and locking means comprises two parts, a handle part (2) and a regulator slide (1), which regulator slide (1) is installed inside the handle part ((2).

Description

[0001] The object of this invention is an adjustment and locking means for a damper plate of a ventilation device, by the aid of which means the damper plate, or the like, of the ventilation device is adjusted, which damper plate is connected by the aid of a cable, wire, or the like, to the regulator slide of the adjustment and locking means.

[0002] The invention thus relates to a device for ventilation, e.g. to a regulating box, which comprises a damper plate, or the like, for the purpose of adjusting the air flow. A damper plate is typically situated inside a regulating box near the inlet duct, so that access to it is difficult. Various adjustment mechanisms have been developed for this purpose. For example, a wire is fixed to the damper plate, to the other end of which wire an adjustment and locking means is installed, which in turn can be disposed in a location to which it is easy to gain access.

[0003] The damper plate is moved in the longitudinal direction of the inlet duct by the aid of the adjustment and locking means, in which case in the minimum flow position the damper plate, which can also be a perforated plate, covers the duct. When the flow is increased, the damper plate is adjusted, by the aid of the adjustment and locking means, inwards in the regulating box farther away from the inlet duct. These types of adjustment and locking means are known in the art. Typical to all of these is that the adjustment is made with the same accuracy for the whole distance of the adjustment movement. In the adjusting of an air flow, however, it is known in the art that the relative change in air flow is at its most near the closing position. When the aperture gets larger than this, the relative change in air flow is no longer as great. In this case a very great measurement accuracy is not therefore needed. On the other hand, at the very start the adjustment movement must be precisely controlled.

[0004] Finnish patent specification 124864 discloses an adjustment and locking means having threads on the outer surface of its body, onto which threads the protrusion or protrusions on the inside surface of the setting means is screwable, and a part of the thread extends to only a part of the outer rim of the body of the adjustment and locking means. In this way an adjustment can be made in the critical adjustment area extremely accurately, while in the other areas the adjustment can be made and locked quickly.

[0005] The adjustment and locking means disclosed by the patent in question is functional, but it is rather large in size, more particularly in diameter. The large size hampers on-site adjustment of the device because it is not possible to thread it through the nozzle diffuser fastened to the regulating box for the adjustment phase.

[0006] The aim of the present invention is to provide an adjustment and locking means for a ventilation device, the means having such a small diameter that it fits through a nozzle diffuser, in which case adjustment of the product on worksites and/or at installation points is easier in the adjustment phase. It is not then necessary to perform many extra opening and closing phases of the front plate. Another aim is to provide an adjustment and locking means with which the adjusting movement is sufficiently accurate in all adjustment positions. The adjustment and locking means according to the invention is characterized in that the adjustment and locking means comprises two parts, a handle part and a regulator slide, which regulator slide is installed inside the handle part.

[0007] One preferred embodiment of the adjustment and locking means according to the invention is characterized in that threads are arranged on the outer rim of the regulator slide, of which the first thread is unbroken and the second thread extends to a part of the outer rim of the regulator slide.

[0008] Another preferred embodiment of the adjustment and locking means according to the invention is characterized in that on the inside surface of the handle part are protrusions, which are able to move in the threads of the regulator slide.

[0009] Yet another preferred embodiment of the invention is characterized in that the protrusions in the threadless area of the second thread part are able to move in the longitudinal direction of the regulator slide, in which case the adjustment can be made by pushing or pulling the regulator slide in relation to the handle part and the adjustment can be locked by rotating the regulator slide in relation to the handle part.

[0010] One of the advantages of the invention that can be mentioned is that in the critical adjustment area the adjustment can be made extremely accurately, while in the other areas the adjustment can be made and locked quickly.

[0011] In the following, the invention will be described in more detail by the aid of a preferred embodiment with reference to the attached drawings, wherein:

Fig. 1 presents a simplification of the intended application of the adjustment and locking means according to the invention.

Fig. 2 presents a detail A of Fig. 1, i.e. the adjustment and locking means according to the invention.

[0012] The part A circled in Fig. 1 presents the adjustment and locking means according to the invention, which means is presented in Fig. 2 in more detail. A cable or wire, which is mostly inside the shell 4 and is movable in its longitudinal direction, is fastened to the adjustment and locking means. The shell does not move, but instead is fixed in its position. The wire, therefore, is able to move inside the shell. A damper plate 3 is fastened to the second end of the wire, which damper plate is thus moved by the aid of the adjustment and locking means. The drawings do not present the regulating box, inside which the damper plate in question is typically installed. When the damper plate is in the closing position, it essentially covers/closes the inlet duct entering the regulating box. When the adjustment and locking means is used in the manner described later, it moves the wire in such a way that the damper plate 3 displaces in the direction of the wire.

[0013] The reference number 5 presents the measuring device of air flow, which is per se conventional and does not itself relate to the invention. For this reason, its operation is not described in more detail here.

[0014] Fig. 2 presents an adjustment and locking means according to the invention. The regulator slide, which is installed inside the handle part 2, is marked with the reference number 1. On the handle part is an adjustment scale 6, by means of which the position of the damper plate is determined. On the regulator slide, correspondingly, is an indicator, which is set to the desired point on the adjustment scale. The adjustment therefore takes place by moving the regulator slide in relation to the handle part. The aforementioned wire is fastened explicitly to the regulator slide 1.

[0015] The outer rim of the regulator slide is provided with threads 7, 8. Of these, the thread 7 is unbroken and its length on the outer rim of the body corresponds to the length of the more accurate adjustment value 0-1 display of the adjustment scale 6. The thread 8 extends to only a part of the outer rim of the regulator slide 6. On the inner surface of the handle part 2 is/are a protrusion or protrusions, or the like, (not presented in the figures), which correspond to the threads 7, 8 of the outer rim of the regulator slide in such a way that the regulator slide 1 and handle part 2 can be rotated in relation to each other. When the protrusion or protrusions is/are at the point of the regulator slide, where there are no threads, the parts move in relation to each other by pushing and by pulling.

[0016] At the point of the unbroken thread 7 the adjustment can therefore be made extremely accurately (adjustment positions 0-1) by turning the regulator slide to the desired point. After that (adjustment positions 1-5) the adjustment can be done notch by notch, when the adjustment value changes by at least the amount of the pitch of the thread. A more precise adjustment value is therefore obtained near the closing position of the damper plate, where the relative change in air flow is more pronounced. In other words, just a very small adjustment movement substantially affects the air flow. The area of unbroken thread is e.g. approx. 10-20% of the whole adjustment area.

[0017] The damper plate 3 can be closed, i.e. adjusted to the 0 position by rotating the regulator slide 1 clockwise and, correspondingly, can be opened from this position by rotating the regulator slide 1 counterclockwise.

[0018] In the area of the adjustment positions 1-5 the damper plate can be opened by pulling the regulator slide 1 outwards from the handle part 2 and, correspondingly, can be closed by pushing the regulator slide inside the handle part. The adjustment is locked in adjustment positions 1-5 by rotating the regulator slide 90° clockwise. Correspondingly, the locking is opened by rotating the regulator slide 90° counterclockwise.

[0019] The invention is described above in connection with a regulating box. It is obvious that also other ventilation devices in which the air flow is adjusted fall into its scope. The invention can also be applied to a turning check plate.

[0020] It is obvious to the person skilled in the art that the invention is not limited to the embodiments presented above, but that it can be varied within the scope of the claims presented below.

[0021] The characteristic features possibly presented in the description in conjunction with other characteristic features can also, if necessary, be used separately to each other.

Claims

1. An adjustment and locking means for a damper plate of a ventilation device, by the aid of which means the damper plate (3), or the like, of the ventilation device is adjusted, which damper plate is connected by the aid of a cable, wire, or the like, to the regulator slide (1) of the adjustment and locking means, characterized in that the adjustment and locking means comprises two parts, a handle part (2) and a regulator slide (1), which regulator slide (1) is installed inside the handle part ((2).

2. An adjustment and locking means according to claim 1, characterized in that threads are arranged on the outer rim of the regulator slide (1), of which the first thread (7) is unbroken and the second thread (8) extends to a part of the outer rim of the regulator slide (1).

3. An adjustment and locking mechanism according to claim 1 or 2, characterized in that on the inside surface of the handle part (2) are protrusions, which are able to move in the threads (7, 8) of the regulator slide (1).

4. An adjustment and locking means according to claim 3, characterized in that the protrusions in the threadless area of the second thread part (8) are able to move in the longitudinal direction of the regulator slide (1), in which case the adjustment can be made by pushing or pulling the regulator slide (1) in relation to the handle part (2) and the adjustment is lockable by rotating the regulator slide (1) in relation to the handle part (2).

Drawing