JPS63156963A - Air curtain system - Google Patents

Abstract

PURPOSE:To form an air curtain at a high wind area, by a method wherein a discharge port and a suction port for a jet flow are intercoupled through a duct to form a closed loop, where a variable blower and a noise absorbing device are incorporated, and a discharge nozzle forms a multilayer parallel nozzle. CONSTITUTION:A discharge chamber 8 and a suction chamber 7 of an air curtain are intercoupled through a duct 9. A blower 1, varying an airflow, is mounted in the duct 9. Air from a blower 1 is introduced to the discharge chamber 8, and noise is absorbed and a flow is uniformized by means of a noise absorbing plate 2 to discharge air through a multilayer parallel nozzle 4 of the discharge port by means of a filter 3. The discharged air forms an air curtain to return it to the blower 1 by its passage through the suction chamber 7 from a louver 5 of the suction port. The multilayer parallel nozzle 4 suppresses diffusion of a jet, and enables improvement of a shut-off effect of an outer air at a low jet speed. This constitution enables an air curtain system to be installed even to a building under strong wind environment without producing unpleasant feeling of a passerby.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention blocks the entry and exit of heat between the air-conditioned indoor side and the outside world, allows the passage of a large number of people, and saves energy by %. The present invention relates to an air curtain system that can be used for buildings exposed to strong outside winds.

Conventional technology Currently, an air curtain is installed at the entrance of a building to block the passage of heat between the air-conditioned interior and the outside world, facilitating the passage of large numbers of people and saving energy. This is being done widely.

By the way, in this conventional air curtain, when the outside wind is strong, the speed of the jet can be increased to block this strong outside wind, but in this case, the jet can cause discomfort to passersby. However, there are problems such as an increase in air flow, an increase in noise (wind noise), and an increase in the power of the blower, making it impossible to put it into practical use.

Means for Solving the Problems In this invention, the jet outlet and suction port, which are the parts that constitute the air curtain, are open ends, and a suction chamber, a discharge chamber, and a duct connecting both chambers are provided to form a closed loop. and a blower equipped with a speed change mechanism in the loop,
A unit is constructed with a built-in sound absorbing device and filter,
Furthermore, a multilayer parallel nozzle is used for the jet nozzle to suppress the dispersion of the jet and achieve the effect of blocking external wind at a lower jet speed. Additionally, if the air curtain system is equipped with a heating device or cooling device that can adjust the temperature of the jet, or a device that can switch between heating and cooling,
The effectiveness of this invention is further increased.

Embodiment FIG. 1 shows an embodiment of the air curtain system of the present invention, in which the air curtain is configured as shown by arrow A, and the outside wind W having a velocity of VsO is directed indoors (on the right side of the figure). After passing through the suction louver 5 and the thin wire mesh 6 from the louver, it is sucked into the blower 1 which has a variable speed mechanism and can freely adjust the air volume. The louver 5 and the wire mesh 6 also have the effect of a coarse filter that prevents dust brought in by the outside wind from being sucked into the blower. Air blast 4! ! 1 is housed in a duct 9 that connects the suction chamber 7 and the discharge chamber 8, and is an important component of the present invention. The air coming out of the blower l is guided into the discharge chamber 8, where small dust is removed by the filter 3 and rectified, and then passes through the multilayer nozzle to form a jet stream.
Configure the air curtain. Further, a sound absorbing plate 2 is provided in the suction chamber 7 and the discharge chamber 8 to absorb the sound emitted from the blower 1, thereby reducing the noise of this air curtain system. Note that 10 indicates a stand for the blower l.

Next, the effect of attracting a jet stream by the multilayer parallel nozzle 4 will be explained. Figure 2 shows the jet J discharged from one nozzle 4/, the jet boundary expands in proportion to the distance as shown by 2, and the jet velocity VJ also becomes thicker only near the center line C (,
The surrounding values are smaller. FIG. 3 shows the case of a multilayer parallel nozzle 4 according to the present invention, in which the jets are attracted to each other, the center lines are rather drawn together, and the jet boundaries 2 do not expand, either.
The jet velocity V can also be maintained at a large value over a longer distance. Therefore, with one layer of nozzles, the nozzle width can be increased (
It is clear that the effect of the air curtain will be greater if the nozzle width is made smaller and the number of layers is increased, rather than by increasing the air volume.

When blocking external wind W having a velocity Vs, the larger the jet velocity V, r, the smaller the nozzle width or the number of nozzles.

However, if vJ is large, the discomfort of passersby will increase, and VJ
The settings have their own limits. In this invention, as a result of experiments, VJ/Vs<1. I came to the conclusion that it would be better to set it to O. Furthermore, although not shown, if a heating device, a cooling device, or a device that can switch between heating and cooling is incorporated into the air curtain system, and the temperature of the jet stream can be adjusted, it will reduce the discomfort of passersby. The air curtain system of the present invention can be further reduced in utility value.

Effects Since the air curtain system of this invention has such a configuration, it is possible to provide air even to buildings in environments with strong outside winds.
An air curtain system has been obtained that allows installation of a curtain, does not cause discomfort to passersby, can save energy, and does not require an increase in blower power.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the air curtain system of the present invention, Fig. 2 is an explanatory diagram of the state of a jet stream produced by one nozzle, and Fig. 3 is an explanatory diagram of the state of a jet stream produced by a multilayer parallel nozzle. It is. Explanation of symbols 1...Blower, 2'' Sound absorbing plate, 3...Filter, 4
...Multilayer nozzle, 5...Suction louver, 6...Wire mesh, 7...Suction chamber, 8...Discharge chamber, 9...
... Connecting duct, lO... Frame No. 18! ! !

Claims (4)

[Claims] (1) In an air curtain system that blocks heat from entering and exiting between an air-conditioned room and the outside world, a jet outlet that is a part of the air curtain;
1. An air curtain system comprising a closed loop with an open end connected to a suction port, and a blower, a sound absorbing device, and a filter built into the loop to form a unit. (2) The above-mentioned claim is characterized in that the rotational speed of the blower in the air curtain system is variable, and the speed of the jet stream forming the air curtain is made variable in accordance with the strength of the outside wind. The air curtain described in paragraph 1
system. (3) A heating device or a cooling device is built into the closed loop of the air curtain system, so that the temperature of the jet stream can be freely adjusted. The air curtain described in any one of the items
system. (4) The jet discharge nozzle in the air curtain system is configured as a multilayer parallel nozzle, the effective width of the jet is increased, and the speed of the jet that blocks outside wind is made smaller than the outside wind speed. The air curtain according to any one of claims 1 to 3 above,
system.