JPH01266462A - Omnidirectional uniform air flow outlet - Google Patents

Abstract

PURPOSE:To obtain the purity recovering characteristics exceeding the theoretical value of instant uniform diffusion by providing a semi-spherical delivery surface and a preliminary diffuser within the afore-said for supplying preliminarily diffused air to the entire delivery surface so as to produce a quasi-uniform pressure flow. CONSTITUTION:The omnidirectional uniform air flow outlet 7 having in it an air filter comprises a short round column at the base of the outlet body proper and a concentric semi-spherical air delivery surface which is connected to said column and extends downwardly. Inside the air delivery surface 8, a preliminary diffuser 9 concentric to the air delivery surface 8 is disposed. The air passing through the air filter hits the preliminary diffuser 9 for preliminary diffusion. The air is then supplied to the air delivery surface 8 for delivery through its air holes into a room as a quasi-uniform pressure flow. The column part of the delivery surface 8 increases the air flow in the lateral direction, and the air is delivered uniformly from the semi-spherical part omnidirectionally. Since the delivery surface presents a relatively large uniform resistance, the delivered air velocity becomes highly uniform.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to an air outlet that is attached to the ceiling of a clean room, and more specifically relates to an air outlet that is installed on the ceiling of a clean room. This relates to a directionally uniform air outlet.

[Prior Art] Generally, clean rooms are ventilated by blowing out clean air from air outlets installed in the ceiling.

For example, a turbulent flow clean room is known in which a flow of clean air creates an agitation effect in the clean room, thereby diluting the dust concentration while preventing uneven dust concentration. As shown in Fig. 4, an early type of air outlet for a turbulent clean room was a truncated conical chamber 2 at the lower end of the outlet 1 with a built-in air purifying filter. is attached so as to protrude downward, and a punching face 3 having a large number of blow-off holes is formed on the lower surface of the chamber 2 . However, in such a blower outlet 1, a strong downward flow was generated directly below the blower outlet, and conversely, only an upward flow was generated between the blower outlets or near the wall of the clean room, and only simple convection occurred, resulting in a low stirring effect. As a result, the dust concentration was uneven and was disadvantageous in terms of cost. In addition, a
indicates a flow of clean air.

Therefore, an air outlet 4 that blows out vertically and horizontally onto the ceiling surface as shown in Figure 5, and an air outlet 5 that blows out in an oblique direction using an anemo air outlet as shown in Figure 6 have been proposed. Efforts were made to improve effectiveness. As an air outlet for such an improved turbulent flow clean room, the U.S. Pat.
There is an idea described in No. 105449. As shown in FIG. 7, this air outlet includes a punching face 30 with a circular bottom surface at the lower end of the outlet body, and a conical baffle plate 6 concentric with the outlet body within the punching face 30. The airflow a from the punching face 30 has extremely high diffusivity. Therefore, it has excellent stirring effect and eliminates dust. ! There is very little unevenness in the degree.

[Problems to be Solved by the Invention] However, the above conventional techniques have the following problems.

That is, when using the turbulent flow method as described above, if the stirring effect is high, places with high dust concentration are less likely to occur, but on the other hand, the airflow a generates a vortex, and dust is not removed from the clean room. For example, the above-mentioned Utility Model Publication No. 62-1054
Also in the embodiment described in No. 49, the airflow a is strongly sent out in an oblique direction along the baffle plate 6, and a vortex is likely to occur between it and the airflow a directly below the punching face 30.

As described above, in the conventional technology, no uneven dust concentration occurs in the clean room, but the dust volume itself is not significantly reduced, and on the contrary, when a local vortex is generated, the dust is removed.

It was getting harder. The present invention was proposed in order to solve these problems, and its purpose is to provide an excellent omnidirectional uniform air outlet that expels dust in a clean room in a manner that pushes it out and sweeps away the dust. The goal is to provide the following.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the omnidirectional uniform air outlet of the present invention has a filter installed at the lower end of the outlet body that has a built-in filter for air purification, and a A roughly hemispherical blowout surface with a large number of blowholes is installed so as to protrude downward, and a certain distance from the blowout surface is maintained so that air is evenly supplied to the inside of the blowout surface over the entire surface of the blowout surface. It is characterized by having a uniform diffusion member installed therein.

[Function] The function of the present invention having the above configuration is as follows.

That is, the air that has passed through the air cleaning filter hits the uniform diffusion member and is uniformly diffused.

This diffused air uniformly hits the substantially hemispherical blowing surface and is blown out in all directions from the blowing holes formed on the entire surface.

This air is blown out from the blowing surface so that there are no differences in characteristics in the circumferential direction, and flows from top to bottom at a slight wind speed without creating macroscopic vortices in the clean room, creating a pseudo-modal extrusion flow. . Dust is discharged along with this extrusion flow while remaining as concentrated as possible to restore cleanliness.

It was thought that it would be difficult to create such an extrusion flow in a convention-type clean room because the amount of circulating air is small and the outlets are scattered. Moreover, since this extrusion flow is created in a simulated manner at low wind speeds, there is a risk that it will be disrupted by slight disturbances such as movement of workers, heat generated by lighting, or differences in outlet temperature, so it was thought to be difficult to realize.

However, according to experiments conducted by the present applicant, the cleanliness recovery characteristics of the present invention having the above-mentioned configuration greatly exceed the theoretical value of instantaneous-like diffusion, unless the frequency of walking of the worker is extremely high. It was also found that the temperature was better than that of the conventional type.

By the way, Utility Model Application No. 62-105 in which the blowing surface is curved
Although the device described in No. 449 is similar in shape to the present invention, its purpose is to improve the diffusivity of airflow and enhance the dust agitation effect, and is different from the present invention. As such, the shape did not aim to be omnidirectional or uniform enough to form a pseudo extrusion flow.

As described above, by blowing out a pseudo extrusion flow, the present invention can obtain higher cleanliness with the same air volume than the conventional technology, and also obtain the same average cleanliness as the conventional technology. In other cases, it is possible to save energy because a smaller amount of air is required.

[Example] An example of the present invention as described above will be specifically described based on the drawings.

Configuration of this embodiment* As shown in Fig. 1, the omnidirectional uniform air outlet 7 with a built-in filter for air purification has a short cylindrical part and a circular center connected to the short cylindrical part at the lower end of the outlet body. A blowing surface 8 consisting of a circular half-pearl portion is provided to protrude downward. This blowing surface 8 is made of fine-mesh punched metal or wire mesh, or a cloth made of synthetic fiber or glass fiber supported by a coarse wire mesh, with many blow-off holes installed on the entire surface. , a moderately large resistance is uniformly applied.

Moreover, a uniform diffusion plate 9 concentric with the blowing surface 2 is provided inside the blowing surface 8, and is made of the same member as the blowing surface 8.

Effects of this embodiment* The effects of this embodiment having the above-described configuration are as follows.

That is, the air that has passed through the air cleaning filter hits the uniform diffusion plate 9, and while being given a uniform resistance, the dynamic pressure from upstream is weakened.

Roughly speaking, this air is uniformly supplied to the blow-off surface 8, and becomes a pseudo-like extrusion flow from the blow-off hole, and is elongated inwardly. At this time, the cylindrical portion of the blowing surface 8 increases the amount of air flowing in the circumferential direction, and the air is blown uniformly in all directions from the semispherical portion. Further, since a relatively large resistance is uniformly applied to the blowing surface 8, high uniformity in Suita wind speed can be obtained.

Comparing the cleanliness recovery characteristics of this embodiment with those of the prior art, as shown in Fig. 8, when the ventilation frequency is 20 times/h, this embodiment achieves a theoretical line of 20 times/h. Delivering superior cleanliness.

Furthermore, in this example, since the wind speed was low, there was a concern that the extrusion flow would be disturbed by walking during work 0, but as shown in FIG. 9, the cleanliness of the outlet 5 in FIG. Even when compared, the dust concentration at times other than when a person is walking is significantly lower, and even on average, the cleanliness of this example is clearly superior.

*Other Embodiments* The present invention is not limited to the above-mentioned embodiments, and the uniform diffusion member may be a concentric vane as long as it can uniformly supply air to the entire blowing surface. Furthermore, by changing the length of the cylindrical part of the blowout surface, the air volume distribution ratio to the ends of the chamber can be changed. Furthermore, the air outlet 70 may be of an omnidirectional uniform type having the outlet surface 80 having a vertically oblong elliptical shape from the front, based on the same idea. (FIG. 2) At this time, the uniform diffusion member 90 is made concentric.

Moreover, a large protrusion from the ceiling often poses a practical problem. Therefore, as shown in FIG. 3, an omnidirectional uniform air outlet 10 may be used in which a hemisphere is sliced into rings at a predetermined height and the outlet surfaces 11 and 12 of the spherical crown are overlapped in a double (or multiple) manner. In this case as well, the blow-off surfaces 11 and 12 are formed in concentric circles with different sizes, and both are separated by a truncated conical ring 13 that is also concentric.
It does not prevent airflow. In such an embodiment, the distribution ratio of the amount of air blown to the outer circumference increases, but
If uniform blowing in all directions is desired, uniform blowing can be achieved by setting the resistance coefficient of the constituent members of the outer blowing surface 11 to be larger than that of the inner blowing surface 12. Note that the uniform diffusion plates 14 and 15 are installed in the direction of the blowing surfaces 11 and 12, respectively.

In the above embodiments, the outer shape of the flange is circular, but this is for a round filter box or for connecting to a duct, and for a square filter box, a flange with a square outer shape is used.

[Effects of the Invention] As described above, the omnidirectional uniform air outlet of the present invention has a substantially hemispherical air outlet and a uniform diffusion member inside the air outlet that uniformly supplies air over the entire area of the air outlet. To provide an omnidirectional uniform air outlet which produces a quasi-like extrusion flow with a simple configuration of having an air flow, and exhibits an excellent cleaning effect that exhibits cleanliness recovery characteristics superior to the theoretical ground of instantaneous-like diffusion. be able to.

[Brief explanation of the drawing]

Fig. 1 is a side view of this embodiment, Fig. 2 is a side view of another embodiment, Fig. 3 is a side sectional view of another embodiment, and Figs.
The figure is a side view of the conventional example, Figure 7 is a side cross-sectional view of the conventional example, and Figure 8 is a graph comparing the cleanliness recovery characteristics of various air outlets.
FIG. 9 is a graph comparing the change in internal cleanliness before and after a person walks between the present invention and a conventional example. DESCRIPTION OF SYMBOLS 1... Air outlet, 2... Chamber, 3... Punching face, 4, 5... Air outlet, 6... Baffle plate, 7... Omnidirectional uniform air outlet, 8... ... Blowout surface, 9... Internal diffusion material, 10... Omnidirectional uniform air blowout port, 11.12... Blowout surface, 13... Ring, 14.15... Uniform diffusion plate, a...Airflow.

Claims (1)

[Claims] A roughly hemispherical blowout surface with a large number of blowholes installed on the entire surface is attached to the lower end of the blowout outlet body, which has a built-in filter for air purification, so as to protrude downward. An omnidirectional uniform air outlet characterized by being equipped with a uniform diffusion member installed at a certain distance from the outlet surface so as to supply air uniformly over the entire surface.