NL1004446C1 - Venturi shaped ventilator for spaces - Google Patents

Abstract

The ventilator consists of an inner and an outer cone with narrowed section of the area between the cones. A certain amount of static pressure, of the primary air flow (1), is converted into dynamic pressure creating a high pressure air jet (3). As the air flows at high speed through the inner cone, secondary air (2) is dragged through the area between the cones As fresh air is mixed in with the high pressure jet, it is possible to work with a higher, resp. lower, inlet temperature without this having any effect on the length of throw of the ventilator.

Description

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Ventilation grille for obtaining a higher number of air changes.

The invention relates to a cone-shaped air grille (figure 1), in which a certain amount of static pressure is converted into dynamic pressure through the narrowing, whereby a high-pressure air jet is created.

The object of the invention is to blow in the air premixed into the grid with a lower or higher blowing temperature, without direct consequences for the throw length of the grid.

In order to obtain a higher number of air changes in a room, it is possible to make use of the induction effect: entraining room air through a high-pressure air jet.

15 The air supplied via the duct system, called primary air, numbered 1 in figure 3, flows into the Meejet ventilation grid. Due to the narrowing, a certain amount of static pressure is converted into dynamic pressure, which creates a high-pressure air jet. Because the air flows out of the inner cone at a high speed, it entrains the exhaust air through the outer cone, called secondary air, numbered 2 in figure 3. Outside the grid, an amount of exhaust air will be entrained, called tertiary air, in figure 3 numbered with 25 4.

The mixed amount of exhaust air, called secondary air, is 1 to 4 times the amount of treated air (primary air).

Because the secondary air is induced by the primary air, the speed of the primary airflow decreases. The air velocity of the Meejet grid, numbered 3 in Figure 3, is therefore quite acceptable, 9 to 20 m / sec. and will generally be perceived as not disturbing. Because the air is already pre-mixed with the leaving air in the grid itself, it will be possible to work with a lower or higher blow-in temperature without this having any consequences for the throw length of the grid.

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Also, at the end of the attachment between the two cones, a blade is made (figure 2), which ensures that the airflow becomes baltic. As a result, the air flow will not tend to deflect strongly at low or high blowing temperatures.

The Meejet ventilation grilles can be supplied in galvanized sheet steel, zincor plate powder coated in any desired RAL color and in stainless steel. .

The Meejet ventilation grilles can be used as follows: - with as air generator: roof center; rooftop units; heat recovery systems or other air treatment systems.

- in combination with a central pressure plenum.

- in combination with a round or rectangular duct system.

- in high factory halls, storage areas, welding halls, etc.

- when blowing in hot and cold air.

- at different air volumes because the Meejet ventilation grille is available in several sizes.

20 However, the Meejet ventilation grilles will usually be used in the following way:

A square plenum is made in a central location in the room (see datail sketch). A number of branches are placed in this plenum, after which a valve and a bend of 15, 30 or 45 degrees are placed. This is what it becomes

Meejet ventilation grille mounted. Thanks to the bend, you can blow in any desired direction.

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CONCLUSION

Ventilation grille, provided with an inner and outer cone, characterized in that a certain amount of static pressure is converted into dynamic pressure through the narrowing, whereby a high-pressure air jet is created.

Because the air is already pre-mixed with the leaving air in the grid itself, it will be possible to work with a lower or higher inlet temperature without this having enormous consequences for the throw length of the grid.

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Figure 3

Schematic side view and principle of operation j \ \ Figure 2 \ ° \ Top view

Figure 1 1 0 0 4 4 4 6 Front view in perspective