FI73069B - INBLAOSNINGSORGAN. - Google Patents

Description

The invention relates to a supply element which is intended to supply air at a relatively low speed directly to the residence zone, and in which the air flow to the distribution chamber 10 in the supply element is led to the wherein the air flow in the blowing member is arranged to be distributed substantially evenly over the entire perforated end face.

A well-known structure in the blowing members is such that it comprises a box-like chamber having an opening 15 on one wall from which the blown air is led along a supply duct to a chamber whose wall facing the room is formed by a perforated plate from which the blowing air is led to a room or the like. The flow rate of the supply air in the supply duct is relatively high compared to the flow rate of the air blown into the ventilated space. However, such prior art blowing members have the serious disadvantage that the flow is not evenly distributed over the entire blowing cross-section, but the flow rate can vary considerably at different points on the blowing cross-section. In this case, the speed peak of the supply air flow velocity at some point in the cross-section of the supply-25 may cause draft. Therefore, the blow-in cross-section generally has to be dimensioned according to said velocity peak, whereby the blow-in pedal surface becomes disproportionately large.

The above-mentioned drawback has already been reported before, and in order to eliminate the drawback, a solution is disclosed, for example, in FI patent publication 44 695, in which the blower member chamber e1 is not rectangular box-shaped, but has a Thus, the chamber converges in the flow direction, whereby the velocity of the air flow through the perforated plate placed in front of the blow-out opening is more even and uniform.

However, the distribution chamber of the blow blowing member according to F1 Publication No. 44,695 does not have any means for equalizing the air flow supplied to the chamber, whereby the flow rate at the narrower end of the distribution chamber is nevertheless higher than at its wider end. In the solution according to this publication, there may even be a situation in which, depending on the flow rate of the air blown from the supply duct, air is sucked through a perforated plate placed in front of the supply opening into the distribution chamber at the supply channel end and blown at a narrower end. In addition, it has been found that e.g. When using a structure such as FI publication 44,695, the pattern of the discharge of air blown through the perforated plate is quite narrow and it even narrows slightly after the perforated plate. This in turn causes the flow rate of the blown air to increase, resulting in draft.

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Some known devices have used a filter mat on the blowing surface to straighten and smooth the flow. However, the need for maintenance of such a device is quite high due to the clogging of the filter mat. The use of such a filter mat in the blowing element-20 has been described previously, e.g. in FI patent application 830670.

In addition, previously known devices have the disadvantage that device-specific air volume control and measurement is quite difficult to perform. This is due to the fact that the previously known devices do not have a min-25 inverted air flow control or measuring unit. In addition, known devices have a high pressure drop, up to more than 100 Pa. The worst disadvantage of a large pressure drop is the development of sound, which imposes restrictions on the use of the equipment.

It is an object of the present invention to provide an improvement over previously known devices. The present invention is mainly characterized in that in order to correct the flow with a relatively small pressure drop inside the blowing member substantially perpendicular to the end face in the air flow direction before the end face, the control means and 73069 1 flow guides are arranged on the side walls of the blow-off member before the end face and the guide members.

Advantages of the invention over previously known solutions can be pointed out e.g. following. In the blowing member according to the invention, the blowing air is evenly distributed over the entire blowing cross-section. In the invention, the supply air jet even expands after the blowing cross-section, whereby the flow cross-sectional area of the supply air jet increases and the flow rate decreases. In the solution according to the invention, the pressure-10 loss is very small, generally less than 30 Pa, and the development of sound at normally used air volumes is almost non-existent. The device according to the invention further has sound-absorbing properties. The solution according to the invention does not have clogging parts, but it can also be cleaned from the inside due to its opening structure.

The blowing element according to the invention is further provided with devices with which the adjustment of the air volume and the measurement of the volume flow are easy to perform. The blowing element according to the invention is well suited for use especially in systems with displacement ventilation.

The invention will now be described in more detail with reference to the figures of the accompanying drawing.

Figure 1 schematically shows an injection member according to the invention.

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Figure 2 is a schematic sectional view taken along line II-II of Figure 1.

Figure 3 is a bottom view of the blowing member of Figure 2.

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Figure 4 shows a detail IV-IV of Figure 2.

In the figures, the blowing member according to the invention is generally indicated by reference numeral 10. In the embodiment according to the figures, the blowing member 35 is rectangular and one of its sides, i.e. the front surface 13, through which the air to be blown is led into the room, is formed of torn sheet. The supply element 10 has a distribution chamber 113069 1 into which the supply air is led through a collar 12 to be connected to the air conditioning duct and from which the distribution chamber 11 the air is led through the perforated end face 13 into the room. Inside the blowing member 10, a pressure-5 spray chamber 14 is arranged before the actual distribution chamber 11, in which the air flow is equalized. The pressure equalization comb 14 is fitted to the blowing member 10 immediately after the collar 12. The pressure equalization chamber 14 is built inside the blowing member 10, so that it does not take up extra space. The pressure equalization chamber 14 is formed of perforated plates 17 and 18, of which the first perforated plate 10 is substantially perpendicular to the air flow flowing in from the collar 12 and separates the distribution chamber 11 and the pressure equalization chamber 14 from each other. The second perforated plate 18 is substantially parallel to the end face 13 and air can flow out of the holes of this second plate 18 through the end face 13. The degree of perforation 15 of the first perforated plate 17, i.e. the perforation percentage, is higher than the perforation percentage of the second perforated plate 18, because a larger amount of air must flow through the first perforated plate 17 with the same pressure drop as the second hole. of the embedded plate 18.

After the pressure equalization chamber 14, the supply air flows past the guides 19 into the distribution chamber 11. The guides 19 are preferably mounted on a torn plate 17 on the distribution chamber 11 side and said guides 19 are preferably planar plates suitably parallel to the supply air flow through the collar 12. The purpose of the guides 19 25 is to straighten the flow into the distribution chamber 11. In the embodiment according to the figures, the guides 19 are shown to be in two pieces, but their number may vary from case to case. The distribution chamber 11 is formed to taper in the direction of the air flow into the distribution chamber so that the cross-sectional area of the distribution chamber 11 perpendicular to the air flow into the distribution chamber is greatest at the beginning of the distribution chamber 11, i.e. at the perforated plate 17 where it is almost zero. The convergence of the distribution chamber 11 is provided by a partition wall 15 extending obliquely from the perforated plate 17 to the end 23. The distribution chamber 11 is made convergent so that the static pressure prevailing in the distribution chamber 11 is the same at each point in the distribution chamber. The distribution chamber 11 is formed to be substantially linearly convergent because the computational convergence to obtain a static pressure of equal magnitude differs so little from the linear that it is very difficult to obtain such a shape. Attached to the partition wall 15 on the side of the distribution chamber 11 is a sound-insulating wool 16 of sound-absorbing material 5, with which the sound attenuation of the blowing member 10 is made high.

The distribution chamber 11 has a velocity component parallel to the end surface 13 relative to the air flow. To eliminate this velocity component, control members 21 are mounted in the distribution chamber 11, by means of which the air flow is directed to run substantially perpendicular to the end face 13. The guide members 21, which are preferably slatted, can be attached either inside the perforated end face 13 or they can be attached at their ends to the side walls 22 of the blowing member 10. The guide members 15 (guide slats) are arranged on the end face 13 as shown in FIG. their mutual distance is approximately equal. However, this is not an absolute condition, but the distance between the control members 21 may also vary. At least one slatted guide member 21 is also arranged between the perforated plate 18 and the end face 13 of the pressure equalization chamber 14.

The guide members 21 are not parallel to each other, but their direction differs from each other, and at least the guide member 21 or members 21 between the pressure equalization chamber 14 and the end face 13 are arranged at a different angle to the front face 13 than the guide members 21 at the manifold 11. 21 can be arranged so that they are not exactly at right angles to the end face 13, but their angle with respect to the end face 13 in the direction of flow is less than 90 °. In addition, this angle may vary at different guide bars so that the guide members 21 closest to the end 23 are arranged at a smaller angle than the bars close to the perforated plate 17. The guide member or members 21 at the leveling chamber 14 30 are in turn arranged on the end face 13 either at a right angle or at an angle greater than this. By changing the angle of the guide members 21 with respect to the front surface 13, an attempt has been made to provide a different steering effect at different points on the front surface 13. Such an arrangement aims to extend the airflow 35 after the front surface 13 and for the same reason leave a space in the vicinity of the end 23. In this case, the flow expands both at the end 23 on the end 23 of the blowing member 10 and on the end on the side of the pressure equalization chamber 14.

The flow tends to contract after the perforated end face 13.

This constriction loop is prevented in the present invention by means of flow guides 20, as shown in particular in Figure 4. The guides 20 are preferably fixed to the side walls 22 of the blowing member 10 so as to extend on each side wall 22 of the blowing member 10 from the collar 12 end to the end 23 of the device. The plane of the blades 20 is substantially parallel to the end face 13 and spaced from the end face 13 that the guide members 21 are located between the guides 20 and the end face 13. The effect of the guides 20 is clearly shown in Figure 4. When part of the flow has to pass under the guides 20, the flow at the edges of the blowing member 10 has a velocity component away from the center, whereby the supply air jet expands. In this case, the flow cross-sectional area of the supply air jet increases and the flow rate decreases. The guides 20 may also extend to the perforated plate 18 of the pressure equalization chamber 14. However, if the guides 20 terminate at the perforated plate 17, it is expedient to cover the outer edges of the perforated plate 18 with a width corresponding to the guides 20 in order to obtain the same anti-constriction effect also at the pressure equalization chamber 14.

It is also advantageous to provide the blowing member 10 for adjusting and measuring the air flow to eliminate the characteristics of the blowing member 10 separately for the prevailing conditions. To control the volume flow, a control flap 24 is mounted on the collar 12, which is preferably made of perforated plate. A supply connection 30 25 for measuring the pressure is arranged in the blowing element 10 at the pressure equalization chamber 14, which measuring connection can be connected to a pressure gauge, for example. Since the pressure is proportional to the volume flow, the volume flow of the control flap 24 can then be adjusted in each case by changing the position of the control flap 24. In order to clean the blowing member 10, the gripping surface 13 is releasably fastened to the blowing member 35. The fastening can be performed, for example, with screws or the like. The blow-in member 10 according to the invention can be mounted on the floor, wall or ceiling. The installation of the blowing element 10 73069 1 can be performed either as a surface installation or it can be installed e.g. inside a wall. In the above description, it has been shown that the blow-in member 10 is rectangular in the shape of a rectangle, but the same effect is obtained by a structure in which the partition wall 15 forms the rear wall of the member, whereby the blow-in member 10 is wedge-shaped.

The invention has been described above with reference to the figures of the accompanying drawing. However, it is not intended to limit the invention to the embodiments shown in the figures, but many modifications 10 are possible within the scope of the inventive idea defined by the following claims.

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Claims (10)

Inlet means, which Mr intends to supply air at a relatively small speed directly to a residence zone, wherein an air stream is led into a distribution chamber (11) in the inflation means (10) through an inlet opening, e.g. through a collar (12) and the air is measured from the distribution chamber (11) through a perforated front surface (13) to the residence zone and the air stream Mr arranged to spread substantially evenly over the entire perforated front surface (13) of the blow-in member 10 (10) , characterized in that control means (21) are arranged inside the inflation means (10) in the direction of flow of the air to the front surface (13) to straighten the flow with relatively small pressure loss inside the inflation means (10) so that it becomes substantially perpendicular to the front surface ( 13), and control means (20) for the current Mr arranged on the side walls (22) of the blow-in means (10) inside the blow-in means (10) in the direction of flow of the air to the front surface (13) and the control means (21) to eliminate the collapse of the supply air jet and for to make the supply air beam as wide as possible after the front surface (13). 1 Patent claim Breathing means according to claim 1, characterized in that control means (19), which Mr substantially parallel to the air flowing into the breathing means (10), are arranged in the distribution chamber (11) to discharge the current inside the inflation means and for controlling the side components of the air flowing into the blower (10) to the center of the blower (10). A blow-in means according to claim 1 or 2, characterized in that a pressure equalizer (14) is arranged inside the blow-in (10) after the collar (12) and before the distribution chamber (11). Breathing means according to claim 3, characterized in that the pressure relief chamber (14) is limited by the side walls (22) and perforated discs (17 and 18) of the inflation means (10), of which a first perforated disc (17) is substantially perpendicular to the the air flow entering the blow-in means (10) and a second perforated disc (18) Mr. substantially parallel to the front surface (13)