JPH0796952B2 - Uniform air outlet in all directions - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates mainly to an air outlet installed in the ceiling of a clean room, and more specifically, it is a whole air ventilator for generating a pseudo push flow. The present invention relates to a direction-uniform air outlet.

[Prior Art] Generally, ventilation of a clean room is performed by sending clean air from an air outlet installed on a ceiling.

For example, a turbulent flow type clean room is known in which a stirring effect is generated in a clean room by a stream of clean air to prevent unevenness in dust concentration and the concentration is diluted. As an initial type of the air outlet of such a turbulent flow type clean room, as shown in FIG. 4, a trapezoidal chamber 2 is provided at the lower end of the main body of the air outlet 1 in which the air cleaning filter is incorporated. A punching face 3 having a large number of blowout holes is formed on the lower surface of the chamber 2 so as to project downward. However, such an outlet 1 has a problem that a strong downward flow is generated just below the outlet and an upward flow is generated between the outlets and on the wall of the clean room, so that dust on the floor is rolled up and a retention area is generated. . For this reason, the dust density unevenness is large, and in order to compensate for it, a larger amount of air is required, which is disadvantageous in terms of cost. It should be noted that a indicates a stream of clean air.

Therefore, as shown in FIG. 5, a blow-out port 4 that blows horizontally to the ceiling surface along with a vertical blow-out and a blow-out port 5 that blows obliquely as shown in FIG. 6 have been proposed to improve the stirring effect. It was As an air outlet for such an improved turbulent flow type clean room, there is a device described in Japanese Utility Model Laid-Open No. 62-105449. As shown in FIG. 7, this air outlet is provided with a bottom face circular punching face 30 at the lower end of the air outlet body, and a conical baffle plate 6 forming a concentric circle with the air outlet body is provided in the punching face 30. It is characterized by being attached, and is characterized by a large diffusion angle of the air flow a from the punching face 30.

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

That is, at the air outlet aiming at improving the stirring effect as described above, the cleaning ability can approach the theoretical value of instantaneous uniform diffusion, but cannot exceed it. Fig. 8 compares the measured values of the cleanliness recovery characteristics of each outlet at the ventilation rate of 20 times / h.
The conventional outlets 1, 4, and 5 cannot exceed the theoretical line of 20 times / h shown by the broken line.

That is, the purpose of the invention described in Japanese Utility Model Publication No. 62-105449 in which the blowing surface has a curved surface is to improve the diffusivity of the air flow and enhance the dust stirring effect. It did not show a shape aimed at omnidirectionality or uniformity to the extent that a smooth extrusion flow was formed. For example,
In the conventional example described in Japanese Utility Model Laid-Open No. 62-105449, the baffle plate 6 produces a fast air flow in an oblique direction, and the wind velocities on the inside and outside of the baffle plate 6 are not necessarily the same. Further, if the blowout airflow has non-uniformity, the extrusion flow is not formed. Such an extruded flow has a small amount of circulating air in a convention type clean room,
Since the air outlets are also scattered, it was considered difficult to form them. Moreover, since this extruded flow is artificially formed at a slight wind speed, it may be disturbed by a slight disturbance such as movement of a worker or heat generation of the illumination, and it has been considered difficult to realize.

The present invention has been proposed in order to solve the problem that the conventional instantaneous uniform diffusion theoretical value cannot be exceeded, and an object thereof is to expel dust in a clean room so as to push it out to clean it out. , To provide an excellent omnidirectional uniform air outlet.

[Means for Solving the Problems] In order to solve the problems described above, the omnidirectional uniform air outlet of the present invention is fed with the lower end of a filter box containing a filter for air cleaning or clean air. At the end of the incoming dough, attach a roughly hemispherical blowing surface with a large number of blowing holes all over the surface so that it projects downward, and supply air evenly to the entire blowing surface inside this blowing surface. It is characterized in that it is provided with a pre-stage diffusion member having the same shape as the blowing surface, which is installed at a constant distance from the blowing surface.

[Operation] The operation of the present invention having the above configuration is as follows.

That is, the clean air hits the front diffusion member and is roughly diffused. The 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 so that there is no difference in the characteristics in the circumferential direction from the blowing surface, and it flows at a slight wind speed from top to bottom without creating a macroscopic vortex in the clean room, and becomes a quasi-uniform rush flow. . The dust is discharged as thick as possible by being put on this extruded flow to restore cleanliness.

[Embodiment] An embodiment of the present invention as described above will be specifically described with reference to the drawings.

* Structure of Example * As shown in FIG. 1, an omnidirectional uniform air outlet 7 having a built-in air cleaning filter is provided at the lower end of the outlet main body with a short cylindrical portion and a concentric circular shape continuous with this. The blowing surface 8 formed of a semi-spherical portion is provided so as to project downward. The blowing surface 8 is made of a fine-meshed punching metal or wire mesh having a large number of air-holes all over the surface, or a cloth such as synthetic fiber or glass fiber supported by a coarse-meshed wire. Is given a large resistance evenly.

Further, a pre-diffusion plate 9 concentric with the blowing surface 8 is provided inside the blowing surface 8 and is made of the same member as the blowing surface 8.

* Operation of the Embodiment * The operation of the present embodiment having the above-described configuration is as follows.

That is, the air that has passed through the air cleaning filter hits the front diffusion plate 9 and is roughly diffused.

Furthermore, this air is supplied to the blowing surface 8 and is made to flow into the room as a quasi-uniform uniform extruded flow from the blowing holes.
At this time, the columnar portion of the blowing surface 8 increases the amount of airflow in the peripheral direction, and is uniformly blown out from the semi-spherical portion in all directions. Further, since the blowing surface 8 is uniformly provided with a relatively large resistance, a high uniformity of the blowing air velocity can be obtained.

As shown in FIG. 8 comparing the above-described cleaning degree recovery characteristics of the present embodiment with the prior art, when the ventilation rate is 20 times / h, the present embodiment shows the theoretical line of 20 times / h. Delivers greater cleanliness.

Further, in the present embodiment, since the wind velocity is low, there is a concern that the pushing flow may be disturbed by the walking of the worker, etc.
As shown in the figure, even when compared with the cleanliness of the air outlet 5 in FIG. 6, the dust concentration when the person is not walking is remarkably low, and the cleanliness of this example is clearly superior as an average value. ing.

* Effect of Example * According to an experiment by the applicant of the present application, the cleanliness recovery characteristic of this example having the above-described configuration shows the theoretical value of instantaneous uniform diffusion unless the walking frequency of the worker is extremely high. It was significantly exceeded, and it became clear that the average cleanliness was better than that of the conventional type. That is, as shown in FIG. 8, the performance of the present embodiment shows a cleanliness recovery characteristic comparable to the instantaneous uniform diffusion theoretical line of 30 times / h ventilation even though the air volume is the same as that of the conventional example. This is a phenomenon that cannot be achieved only by the stirring effect, and proves the superiority of the extrusion flow method.

* Other Embodiments * The present invention is not limited to the above-described embodiments, and the pre-stage diffusion member may be any one that can roughly supply diffused air to the entire blowing surface, and may be, for example, concentric vanes. Further, by changing the length of the cylindrical portion of the blowing surface, it is possible to change the air volume distribution ratio to the chamber end. Further, an omnidirectional uniform air outlet 70 having a blowout surface 80 having a vertically elongated elliptical shape on the front for the same purpose may be used. (FIG. 2) At this time, the pre-diffusion member 90 is concentric.

Further, a large protrusion from the ceiling often poses a practical problem. Therefore, as shown in FIG. 3, an omnidirectional uniform air outlet 10 of a type in which hemispheres are sliced at a predetermined height and the blowout surfaces 11 and 12 of the ball caps are overlapped in double (or multiple) may be used. In this case as well, the blowing surfaces 11 and 12 are formed in concentric circles having different sizes, and the two are also divided by the concentric circular truncated cone-shaped ring 13, which does not prevent the air flow. In such an embodiment, the distribution ratio of the amount of air blown to the outer peripheral portion becomes large, but when it is necessary to uniformly blow in all directions, the resistance coefficient of the constituent member of the outer blow surface 11 is changed to the inner blow. By setting it larger than that of the surface 12, it is possible to approach a uniform blowout. The front diffusion plates 14 and 15 are installed in the directions of the blowing surfaces 11 and 12, respectively.

In the above embodiments, the outer shape of the flange is circular, but it is for a round filter box or for connecting a duct, and for a rectangular filter box, a flange having an outer shape is used.

[Advantages of the Invention] As described above, according to the omnidirectional uniform air outlet of the present invention, a substantially hemispherical blowing surface and the air roughly diffused over the entire blowing surface are supplied to the inside thereof. An omnidirectional uniform air outlet that creates a quasi-uniform rush flow by a simple structure that includes a pre-stage diffusion member, and that has an excellent cleaning effect that exhibits cleanliness recovery characteristics that exceed the theoretical value of instantaneous uniform diffusion. Can be provided. Furthermore, the present invention can obtain a high cleanliness level with the same air volume as compared with the prior art by blowing out a pseudo extrusion flow, and also when obtaining the same average cleanliness level as the prior art, Energy can be saved because a smaller amount of air is required.

[Brief description of drawings]

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.
FIG. 7 is a side view of a conventional example, FIG. 7 is a side sectional view of a conventional example, and FIG. 8 is a graph comparing cleanliness recovery characteristics of various air outlets.
FIG. 9 is a graph comparing the present invention with a conventional example of changes in indoor cleanliness before and after a person walks. 1 ... Blowout port, 2 ... Chamber, 3 ... Punching face, 4,5 ... Blowout port, 6 ... Baffle plate, 7 ...
… Unidirectional air blower, 8 …… Blowout surface, 9 …… Front diffuser, 10 …… Unidirectional air blower, 11,12 …… Blowout surface, 13 …… Ring, 14,15… ... front diffuser, a ... air flow.

Claims (1)

[Claims] 1. A substantially hemispherical blowout surface having a large number of blowout holes all over the lower end of a filter box having a built-in filter for air cleaning or the end of a duct to which clean air is sent. In order to supply air evenly to the entire blowing surface, a pre-stage diffusing member of the same shape as the blowing surface is installed inside the blowing surface, keeping a certain distance from the blowing surface. Characteristic omnidirectional uniform air outlet.