FI87690B - Device for setting and adjusting the volumetric flow rate in ventilation devices - Google Patents

Abstract

Device for measuring and adjusting the volumetric flow rate in ventilation devices. The device has two adjusting devices 20, 30 connected in series for the volumetric flow rate q of the air in connection with a ventilation duct. One of the adjusting devices is used to set a maximum air flow q0. The flow resistances of the adjusting devices 20, 30 together define a minimum air flow q1. A hollow tube 30, which is provided with perforated shell and measuring chamber 32 and/or 33 or similar perforated flow resistance or distributor acts as setting device for the maximum air flow q0. A perforated actuating valve 20 acts in its tightly closed position as setting device for the minimum air flow q1, a maximum air flow q0 prevailing in the open position 20' of the actuation valve 20. The hole diameter d of the perforation 21 of the said actuation valve 20 is in the range d = 3...10 mm and the relative distribution s of the holes 21 is within the range s = 7...20 mm and the ratio d/s between the hole diameters d and the hole distribution s is in the order of d/s <0.4. <IMAGE>

Description

87690

Ventilation equipment volume flow setting and adjustment device Anordning för inställning och regiering av volymströmmen i ventilationsanordningar 5

The invention relates to a volume flow measuring and control device for ventilation devices, comprising two air volume flow control devices connected to Saija, which are tracked in connection with a ventilation duct, one control device having 10 adjustable maximum airflow and the control devices -A hole tube or similar torn flow resistor or diffuser with a routed jacket and measuring chamber as the airflow setting device.

15 The most typical ventilation disadvantages in houses with mechanical extraction have proven to be draft, room air obstruction, the spread of odors between and inside the apartments, and condensation nuisance in the structures. In houses equipped with mechanical blowing and removal and air heating, the complaints are mainly caused by noise, draft, the spread of odors between the apartments and the difficulty of maintenance and use.

; ·; 20

With regard to the state of the art related to the present invention, reference is made to RC-Linja Ky's Finnish patent 71,614 and journal article LVI-2 1990 p. 20-26, Marianna Luoma: "New directions in apartment building ventilation".

The main object of the present invention is to further develop the state of the art while reducing the above-mentioned drawbacks.

It is a particular object of the invention to provide a new ventilation air flow control device which can control both the minimum air flow and the maximum air flow of the ventilation duct so that the device meets high requirements both in terms of air technology and sound technology. With regard to sound technology, the aim is to provide a control device, 2 87690, which does not generate harmful noise and which has a sufficiently high sound attenuation, taking into account the sound insulation between the different apartments.

Another object of the invention is to provide a control device in which the air flows of both the basic ventilation and the booster ventilation can be measured reliably in a simple manner on the basis of pressure differences and set to the correct values. The purpose of the air flow regulator is also to act as a fire choke, if necessary, by means of which the air flow can be limited to the maximum permissible air flow of the fire choke, which is currently 42 dm3 / s with a pressure difference of 100 Pa.

10

The invention is intended to be suitable for use in both new production and renovation.

The control device according to the invention is suitable for use on both the exhaust and supply air side for setting and exchanging the minimum air flow and maximum air flow levels. If necessary, the invention is also applicable to suitable values suitable for the measurements of the air flows in question and the settings made on the basis thereof, also in applications other than lychees.

In order to achieve the above and later objects, the invention is essentially characterized in that the device comprises a torn air flap acting as a minimum airflow setting device in its closed position, with a maximum airflow in the open position, and that the perforated diameter d of the perforated flap is = 3 ... 10 mm and the mutual distribution s of the holes is in the range s = 7 ... 20 mm 25 and the ratio of the hole diameters d to the hole distribution sd / s is in the range d / s <0.4.

The control device according to the invention realizes the following advantages in different applications: necessary ventilation enhancement and, if necessary, return to the basic state, eg controlled by a timer, 30 - minimum airflow limitation of the maximum air flow to a fire choke by limiting the number of holes in the perforated pipe to suit 5

Although the invention will now be described for the most part with reference to the fitting of a control device in connection with a kitchen hood, it must be emphasized that the invention is also suitable for use in other places in ventilation devices, also on the supply air side. The control device according to the invention is also suitable for use at various points in the ventilation duct, also outside the terminal members.

In the following, the invention will be described in detail with reference to the application examples of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way narrowly limited.

15

Fig. 1A is a schematic side view of a setting and adjusting device according to the invention in a cooker hood and the measurement of its air flow with the booster flap closed.

Fig. 1B shows the same as Fig. 1A with the booster flap in the open position.

•: 20

Figure 2 shows the effect flap according to the invention and the location and dimensioning of its holes.

Figure 3 shows the connection of a cooker hood with a control device according to the invention to the ventilation system of an apartment building 25 and its operating principle.

The kitchen hood shown in Figures 1A and 1B comprises a chamber part 12, the upper side of which has a pipe connection 11, through which the hood is connected to the exhaust air duct 11a. Attached to the underside of the chamber part 12 is a hollow-collecting dome part 30 13 with a transparent front flap 14. Inside the dome part 13 there is a removable grease filter 15. In connection with the horizontal wall opening, the effect flap 20 must be opened and closed. and in Figure 1B in the open position 20 '. Above the booster flap 20 is a perforated tube 30. In the closed position, the booster flap 20 is perpendicular to and coaxial with the central axis of the perforated tube 30.

5 The perforated tube 30 has an evenly spaced perforation 31 which opens into the interior 18 of the housing part 12. At the lower end of the perforated tube 30 there is a flange by The hole at the upper end of the tube 30 is a pressure-measuring chambers 32 and 33 and above the closed end wall 38. In the measuring chamber 32 can be measured hole 10 of the tube 30 and the interior pressure of the metering hole 33 of the tube 30 outside of the pressure, that is, the space 18 at the top of the pressure. The measuring chambers 32 and 33 can be connected by hoses 32a and 33a according to Figures 1A and 1B to a pressure gauge 35 having measurable pressure differences Δρ0 and Apj.

An annular edge portion 20a at a certain small distance from the main plane of the flap without tearing the booster flap 20 seals the flap 20 in a stable closed position against the elastic sealing ring 28. The sealing ring 28 is attached to the lower surface of the flange 37 of the wall 17 or the perforated pipe 30 and / or to the edge 20a of the flap 20.

One essential new feature of the invention is the dimensional dimensioning and coordination of the effect flap 20 with the perforated pipe 30. In order to achieve at the same time a suitable pressure difference Apj (Fig. 1A) and sufficient sound attenuation without disturbing noise generation due to the air flow qt at the flap 20, the division s 21 and the diameter d of its holes 21 must be dimensioned within precise limits.

25 ....: Figure 2 shows a particularly preferred dimensioning example according to which the effective head 20 has an effective diameter D = 125 mm and has 69 holes with a diameter d = 5 mm and a hole pitch s = 13 mm. The holes 21 of the booster flap 20 are most preferably in rows perpendicular to each other with an even distribution of s. In this case, with an air flow q, = 11 dm3 / s 30, the pressure difference Apj »80 Pa. The hole density in the flap 20 of Fig. 4 is the air flow q (relative to 5.8 rcikää / dnvVs. Studies have shown that the above 5,37690 sizing is optimal in both aerospace and sound engineering. Extensive studies have shown that the effect flap 20 operates as intended in the following environment in the design range d = 3 ... 10 mm, s = 7 ... 20 mm and in addition the ratio d / s must be d / s <0.4 The above design ensures adequate flow resistance, 5 adequate sound attenuation and at the same time sufficiently small for the intended use noise development.

With regard to the operation and dimensioning of the perforated pipe 30, reference is made to its Finnish patent 71 614 for RC-line Kyi. In this connection, it should be noted that the maximum air flow q0 is set by the perforated pipe 30 with a pressure difference Δρ0. The pressure difference Δρ0 can be measured according to Fig. 3B with the booster flap 20 in the open position 20 in the measuring chambers 32 and 33. In the cooker hoods connected according to Fig. 3, Δρ0 is generally Δρ0 ~ 100 Pa. If necessary, the perforated pipe 30 can be equipped with an annular control device disclosed in the above-mentioned FI patent and application, with which a certain number of holes 31 15 can be covered to adjust the maximum airflow q0 of the pressure difference Δρο to a suitable level, e.g. so that the perforated pipe 30 acts as a q0 = 42 dm3 / s with a pressure difference Δρ0 = 100 Pa. Said adjustment can also be made in such a way that part of the holes 31 is closed, e.g. with plastic plugs. Even then, when acting as a fire choke, the maximum number of all holes 31 in the perforated pipe 30 is such that the above-mentioned maximum permissible air flow q0 = 42 dm3 / s is not exceeded even if the plastic plugs are lit. Correspondingly, the flow resistance of the booster flap 20 can be adjusted as desired by closing the required amount of the thighs 21 with plastic plugs 21a or the like.

Figure 3 illustrates the connection of a control device according to the invention to the ventilation system of an apartment building. The ventilation system comprises a fan 40, the suction side of which is connected to a manifold 41, from which branch vertical ducts 42 to different floors of the apartment building. Kitchen hoods or similar outlet connections connected to the vertical ducts 42 by the connecting pipe 11a are marked with K. The lower part of Fig. 3 shows a basic "analog connection" of one kitchen K 30 cooker hood or similar air control devices 20 and 30, in which switch k (in its closed position represents a situation where the booster flap 20 is in the open position 37 ', where the hood or similar flow resistance consists mainly of perforated pipe 30 and the maximum air flow q0 is generally in the range q0 = 20-40 dm3 / s. To implement the mini mi flow qL, the flap 20 is in the closed position (switch kt in the open position), where the minimum flow qt is determined by the flow resistors on the basis of synergies.

When the perforated pipe 30 is connected to the booster flap 20 according to the invention, the perforated pipe 30 provides sufficient inter-apartment sound attenuation with sufficiently low noise generation with the booster flap 20 in the open position 20 'while the perforated pipe 30 10 acts as a tune to act in an appropriate manner. In addition, the perforated tube 30 is quickly traced from below for removal for cleaning.

15 Finally, it should be emphasized that while the present invention has been described in connection with an exhaust air terminal member, wherein the terminal body has a cooker hood may be of volume flow measurement according to the invention and the control device used in the other exhaust air terminal bodies such as the cooker hood, and also in ventilation supply air-side end organ such as diffusers in connection with.

20

The following claims set forth within the scope of the inventive idea, the various details of the invention may vary and differ from those set forth above by way of example only.

. 25

Claims (6)

1. The volume and control device for the volume flow in ventilation devices, which comprises two series-connected control devices (20,30) for the volume flow (q) of the air, which are arranged in connection with a ventilation channel, whereby a maximum of one control device can be set. air flow (q0) and wherein the flow resistance of the control devices (20,30) together limit a minimum air flow (qt), and the device comprises a heel tube (30) provided with a perforated jacket and measuring chamber (32 and / or 33) or the corresponding perforated flow resistor or spreader which acts as a setting device for the maximum air flow (q0), characterized in that the device comprises a perforated efficiency flap (20) which functions in a closed position to act as a setting device for the minimum air flow (qj), wherein a maximum air flow (q0) rises in the open position (20 ') of the actuation flap (20) and The diameter d of the perforation (21) of said efficiency flap (20) is in the range d = 3 ... 10 mm and the mutual distribution s of the heel (21) is in the range s = 7 ... 20 mm and the ratio d / s between the pour diameters d and the heel distribution s is in the range d / s <0.4. Control device according to claim 1, characterized in that the diameter d of the heel (21) of the actuating flap (20) is in the range d = 3-6 mm and the heel distribution s in the range s = 10-15 mm and the ratio d / s <0.4. Control device according to claim 1 or 2, in which at the end of the heel tube (30) there are 25 measuring chambers (32, 33), characterized in that the pressure difference (APq) caused by the heel tube (30) can be measured between the measuring chambers (32, 33). ), and thereby the maximum air flow (q 2) that passes through the control device where the actuating flap (20) is in the open position (Fig. 3B) and that one can measure the pressure difference (Δρ,) caused by one of the measuring ducts (32) and the outdoor air. the actuating flap (20) in the closed position and thereby the minimum air flow (qj) passing through the control device (Figure 3A). Control device according to any of claims 1-3, characterized in that the current resistance of the heel tube (30) and / or the efficiency flap (20) can be set to respond to the desired minimum and maximum air currents (q0, qi) by shutting off a portion of the flow heels (21,31) with plugs (21a, 31a). 5 Control device according to any of claims 1-4, characterized in that the heel (21) of the actuation flap (20) is in perpendicular rows to each other, preferably with even distribution (s). Control device according to any of claims 1-5, characterized in that the actuating flap (20) has an annular edge part (20a) which seals in the actuating flap (20) tightly in the closed position against the elastic sealing ring (28) and said sealing ring (28) is fixed to the lower surface of the wall (17) of the air duct or of the flange (37) of the heel tube (30) and / or to said edge (20a) of the actuation flap (20).