JPS5835959Y2 - Variable air volume type attraction unit - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable air volume type attraction unit, and in detail,
-The present invention relates to a variable air volume type attraction unit that selects the air to be attracted according to changes in the air volume.

The variable air volume method is a method that attempts to maintain indoor setting conditions by adjusting the amount of air blown into the room according to the indoor load.

However, while this method has the advantage of not using wasted energy to maintain room temperature, it is difficult to obtain good indoor air distribution despite the change in air volume, especially in certain areas. There is a problem in that cold drafts are likely to occur in living areas when under load.

Furthermore, since the amount of air blown decreases in proportion to the sensible heat load, the indoor humidity increases relatively, and reheating may be required to maintain the indoor relative humidity.

In order to solve these problems, conventional methods used the high-temperature air in the attic as a reheat source to exhaust heat from lighting equipment, etc. from indoors during partial loads, and used that air to attract primary air. A variable air volume type induction unit has been devised that uses primary air to mix the mixture with primary air and blow it into the room.

However, since this conventional variable air volume induction unit closes the damper that induces secondary air at maximum load, only -carbonitrous air is blown into the room, which may cause indoor occupants to feel a cold draft. There was a problem.

The variable air volume type attraction unit according to the present invention solves the above problems at once by selectively attracting indoor air at maximum load and attic air at minimum load.

Hereinafter, a variable air volume type attraction unit according to the present invention will be described with reference to the drawings.

In FIG. 1, the attraction unit 1 consists of a casing 3 installed in the attic 2 and a plenum chamber 4 housed within the casing 3.

One end of the plenum chamber 4 is connected to a carbon-nitrogen gas introduction duct 5, and the other end is a nozzle 6.

Primary air that has been cooled and dehumidified by another air conditioner (not shown) is ejected from this nozzle 6, but the amount of ejection is determined by the thermostat T and modutrol motor M installed in the room 7. The opening degree is adjusted by the primary air amount adjusting damper 8.

This attraction unit 1 includes a damper 10 that opens and closes between an attraction pressure generation section 9 formed between the blemish chamber 4 and the casing 3 and the attic 2, and a damper 10 that opens and closes between the attraction pressure generation section 9 and the room 7. It includes a damper 11 that opens and closes.

These dampers 10 and 11 automatically open and close depending on the strength of the induced pressure, and when the induced pressure is weak, they are located at the dotted line position by the pressing means or their own weight, but when the induced pressure is strong, they are located at the dotted line position by the damper's own weight. Since a force larger than the force is applied, the damper moves against its own weight to the solid line position.

When the thermostat (T) detects that the indoor temperature has become higher than the set temperature during the maximum cooling load, the damper 8 operates to increase the degree of opening.

For this reason, high-pressure cooled primary air is ejected from the ejection nozzle 6, so the pressure in the induced pressure generation section 9 decreases because the air around the ejection nozzle is pulled by the viscosity of the ejected primary air. .

Therefore, the attraction pressure becomes strong and the dampers 10 and 11 move to the position indicated by the solid line, so the attraction section 9 does not communicate with the attic 2 but with the room 7.

Therefore, through the return air port 12 and the opening of the damper 11,
Since indoor air is drawn in, the low temperature primary air is mixed with the indoor air and is blown out through the blow-off duct 13 and into the room from the blow-off port 15.

In this way, the room 7 is cooled with a good air temperature distribution because low-temperature primary air is not directly blown out.

Next, when the cooling load is low, the opening degree of the damper 8 is narrowed by a command from the thermostat T, and when the amount of ejection from the nozzle 6 decreases, the induced pressure decreases.

Therefore, the force lowered by the weight of the dampers 10 and 11 is greater than the force due to the attraction pressure, and the dampers 10 and 11 move to the dotted line position, so the attraction pressure generation section 9 communicates with the attic space 2 through the bypass hole 14.

Therefore, the high-temperature air in the attic 2 is attracted, mixed with the secondary air, and then blown out into the room 7, which prevents air that is extremely lower than the room air temperature from being blown out, allowing maximum cooling. Good air distribution is obtained as under load.

During the partial cooling load between the maximum cooling load and the minimum cooling load, the dampers 10 and 11 are both half-opened, so the air in the attic 2 and the room 7 is attracted, and air at an appropriate temperature is supplied. The air is blown out from the air outlet 15.

Therefore, according to the attraction unit of the present invention, even if the amount of primary air changes, as is clear from the above, the air to be attracted can be selected accordingly, making it comfortable to use without using a reheating device. A uniform air temperature distribution can be obtained.

In addition, with the induction unit according to the present invention, the duct size of the primary air can be reduced by lowering the temperature of the secondary air as much as possible, and if all the outside air is used for the secondary air, the ventilation effect of the building can be improved. It has the advantage of being maintainable.

Further, although the dampers 10 and 11 are mounted at the same height at the bottom of the plenum chamber 4, it is also possible to provide them one above the other without using a bypass hole, as shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a variable air volume type attraction unit according to the present invention, and FIG. 2 shows an example of a modification of the design of the variable air volume type attraction unit of FIG. 1...Variable air volume type attraction unit, 2...
・Behind the ceiling, 3...Housing, 4...
plenum chamber, 6. ... Nozzle, 8, 10.
11... Damper, 9... Attractive pressure generation section, 12... Return air port, 13... Lighting equipment, 14... Bypass Hole, 15...Blowout outlet.

Claims (1)

[Scope of utility model registration request] In a variable air volume type attraction unit that generates attraction force between the plenum chamber and the housing to mix primary air and secondary air, the above-mentioned attraction pressure generation section and the ceiling space containing the air heated by the indoor lighting equipment. and a second damper that opens and closes between the induced pressure generating section and the room. The damper is configured to open and close automatically depending on changes in the induced pressure and the weight of these dampers, and when the secondary air amount is large, the first damper closes and the second damper opens, thereby reducing indoor air. 1. A variable air volume type attraction unit, characterized in that the first damper opens and the second damper closes when the negative air volume is small, thereby attracting air in the attic.