JPS60137462A - Nozzle for air shower - Google Patents

Abstract

PURPOSE:To improve remarkably dust removing effect by providing a fixed impeller and a rotating impeller in the inside of a nozzle main body and ejecting double whirling streams caused by the action of both blades to an object to be cleaned. CONSTITUTION:When a nozzle for air shower is fitted to an air chamber or the like by utilizing a fitting seat 14 and a through hole 15 for fitting and used, the supplied air passes through the inside of the nozzle main body 8 and is ejected from an air jet port 10 which is opened in the prescribed direction. On this occasion, air collides first with each blade 33 of a fixed impeller 22 inside the nozzle main body 8 and rotating force is given to the nozzle main body 8 by said blades 33, therefore the main body 8 is rotated around an axial line 16C and the air jet port 10 is oscillated. Further, since a rotating impeller 24 is rotated by the air flowing inside the main body 8, the air steam becomes a whirling stream and is flowed out from the port 10. Therefore, double whirling steams having excellent dust removing effect are formed at the outside the nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air shower nozzle that blows air onto objects to be cleaned in order to remove dust and dirt attached to human clothing, machinery, etc. and clean them. It is.

For example, when a worker enters a clean room, biohazard room, precision equipment 1 food, printing, painting, etc. work room, it is almost mandatory to pass through an air shower room to thoroughly remove the dust that has adhered to the room before entering the room. It is being

For example, as shown in FIG. 1, such an air shower room may include a plurality of air nozzles 6 installed in an air chamber 2 disposed on the side of the object to be cleaned (the worker in the figure) 1. A device is known that is configured to supply air from a sirocco fan 4 or the like to the air chamber 2 so that a jet air stream injected from each air nozzle 6 is blown onto the object 1 to be cleaned. Air nozzles, which are also used in Japan, are called jet showers and simply spray air at the required flow rate from a cylindrical air injection port; The free jet of air was like a laminar flow.

As shown in FIG. 2, when the laminar air flow 5 collides with the object 1 to be cleaned, the space 6 on the opposite side to which the air hits becomes negative pressure due to the so-called Karun's vortex principle, and the object 1 to be cleaned becomes negative pressure. It has been found that dust tends to adhere to the area 1a facing the negative pressure air 1116 rather easily. In particular, the objects to be cleaned are those that differ from humans and do not move or are difficult to move during air shower operation, such as cages and trolleys for laboratory animals, semi-finished products in the food industry, and equipment and raw materials in the printing and painting industries. This tendency is remarkable for such cases. In the past, attempts were made to increase the ability to remove adhering dust by simply increasing the flow velocity of the free jet of air injected from the air nozzle, without knocking off the adhering dust. It has also been found that the dust removal effect reaches an equilibrium depending on the time of exposure to the air flow and the flow rate of the air flow, and that no improvement in the 7M removal effect can be expected even if the flow rate of the air flow is increased further.

The present invention has been made in view of the above-mentioned problems, and one embodiment thereof will be described below based on the attached illustrative drawings.

In FIGS. 3 to 6, 8 is the nozzle body, and 9 is the mounting casing. The nozzle body 8 has a cylindrical portion 11 excluding the cylindrical air injection port 10 at the tip, which is expanded into a spherical shape having its center on the central axis 12 of the air injection port 10.

The mounting casing 9 includes an annular holding portion 16 that fits onto the spherical cylindrical portion 11 of the nozzle body 8, and a mounting seat 14 that does not protrude from the annular holding portion 16 in a flange shape. The seat 14 is provided with mounting through holes 15 at a plurality of locations in the circumferential direction.

Reference numeral 16 denotes a ball bearing interposed between the annular holding portion 15 and the spherical cylindrical portion 11 of the nozzle body, and its inner race 16a is aligned with the central axis 12 of the nozzle body 8.
The outer race 16b is fixed to the outer circumferential surface of the spherical cylindrical portion 11 in a state obliquely inclined to It is fixed to the outer molded plate 17 inside. The nozzle body 8 supported by the ball bearing 16 is rotatable around the center axis 16c of the bearing 16 that intersects the center axis 12 of the nozzle body 8, and therefore rotates around the center axis 16c of the bearing 16, which is the center of rotation. On the other hand, the air injection port 10, which opens at an eccentric position, undergoes an oscillating motion due to the 80 rotations of the nozzle body.

The outer molded plate 17 and the inner cover plate 18 are connected with bolts 19 and nuts 20.
The through hole provided in the mounting hole is the through hole 15 for the above-mentioned attachment. Reference numeral 21 denotes a sealing material such as rubber that is fitted onto the seat 14.

Reference numeral 22 denotes a rotor blade which is rotatably mounted in the spherical cylindrical portion 11 of the nozzle body 8 so as to be rotatable around its central axis 12, and is curved in the same direction with respect to the shaft portion 215 and its axis. It consists of a plurality of blades 24 in the circumferential direction. The rotary blade 22 has a shaft portion 2 made of synthetic resin such as polyacetal resin, for example.
6 and the blades 24 can be formed by any manufacturing method, such as integrally molding them. Shaft portion 23 of the rotor blade 22
Both ends 25a, 25b are formed into spherical shapes, and are rotatably fitted into spherical recesses 26a, 26b formed at the free ends of the parallel ends 25a, 25b of the strip bracket 25. Parallel portions 25a at both ends of the bracket 25
, 25b is curved so as to come into contact with the inner surface of the spherical cylindrical portion 11 of the nozzle body 8.
The mounting provided at C is done using the bracket 25 using the hole 27.
is attached to the inner surface of the spherical cylindrical portion 11 of the nozzle body 8 via a screw 28 and a nut 29. Reference numeral 50 denotes a pair of cut and raised pieces formed on the inner peripheral edge of the spherical cylindrical portion 11 of the nozzle body 8, and between the pair of cut and raised pieces 30, the lower end of the bracket curved portion 25C is inserted. By fitting, the bracket 25 is prevented from rotating around the screw 2δ.

? 51 is a fixed wing fixed within the nozzle body 8. This fixed wing 61 is connected to the spherical cylindrical portion 1 of the nozzle body 8.
The mounting that is fitted and fixed to the inner circumferential portion of the inner end (on the opposite side of the air injection port 10) of 1 is a seat 62, and this mounting is provided protruding from the seat 62 toward the central axis 12 and is It is composed of a plurality of circumferentially inclined blades 66,
Is this installation the seat 52 and the blade? 55 can be integrally molded from synthetic resin similarly to the rotary blade 22. The seat 2 can be fixed to the nozzle body 8 with adhesive, a vent, or other methods with both ends of the seat 2 in contact with the cut-and-raised pieces 50; The blades 3i5 may be individually attached to the nozzle body 8 without being used.

As described above, the air shower nozzle of the present invention equipped with the rotating H22 and the fixed vane filter 1 can be attached to the near chamber shown in FIG. In this state of use, the air supplied into the air chamber passes through the nozzle body 8 and is ejected from the air injection port 10 that opens in a predetermined direction. However, the air entering the nozzle body δ hits each blade '55 of the fixed blade 22, and as a result of applying a rotational force to the nozzle body 8 via this blade 55, the nozzle body 8 rotates around the rotation center axis 16C. It rotates automatically, and the air injection port 10 located at an eccentric position at the tip makes an oscillating motion. Furthermore, the rotor blades 22 are rotated by the air flowing in the nozzle body 8, and the rotation of the rotor blades 22 causes the air flow to become a swirling flow and flow out from the air injection port 10. Therefore, when viewed from the outside of the nozzle, the outflowing F flow becomes a double swirl flow in which a thin swirl flow caused by the action of the rotor blade 22 is further swirled greatly by the oscillating motion of the air injection port 10.

That is, as shown in FIG. 7, the thin swirling air flow 54a turns into a double swirling air flow 54 that swirls more widely, and collides with the object 1 to be cleaned. When such a doubly swirling air flow 64 acts on the object to be cleaned 1, the negative pressure that would be generated if the air flow 5 was laminar as shown in FIG. Since the space 6 is not substantially formed, there is not only no tendency for dust to adhere to the back surface of the object to be cleaned 1 opposite to the side that the air flow collides with, but also a sufficient dust removal effect from the back surface. Since it is possible to obtain
Overall, it was recognized that the dust removal effect for the object to be cleaned 1 was improved by 11 points.

In order to confirm the dust removal effect of the nozzle according to the present invention shown in the above example, a comparative experiment with a conventional jet nozzle was conducted as follows.

fl) 4A iA experimental air shower room model Hitachi Layer PCJ-750E (N) Circulating air volume 34
n? /min Blow speed 20-26 m/sec Nozzles All 12 a...Conventional product (bunker louver 7 without rotation H22) PK 3 Nozzle diameter 381 B...Improved nozzle (rotor blade 22 only) This is a nozzle having no fixed blades 61.Therefore, since the air injection port 10 does not swing, the injected air flow becomes a single swirling flow.

(2) Experimental Method A. The experiment was conducted using two types, conventional nozzle a and the present nozzle b, using a human body wearing dust-free clothing and a transport vehicle equipped with a 100-inch vial container.

Before starting the experiment, I tested 1. After running the shower continuously for 10 minutes, the prefilter was sealed. In order to move the dust sampling tube to each measurement point, we installed an automatic traverse device that suppressed dust generation in advance so that the measurement points could be moved arbitrarily from outside without the need for the measurement person to enter the room. In addition, in order to reduce the amount of dust generated in all rooms, a transparent acrylic board with a central opening with a diameter of 50 m was installed on the floor in the form of a floating floor, and a sampling tube with a hopper-shaped tip was welded under the central opening. led outside. The transparent acrylic plate used was one that had been subjected to antistatic treatment.

C. Dust concentration needle (He-Ne laser particulate meter) ■Laser, aerosol spectrometer Range 4 0.09-3.0μm Channel: 15CH (each range) Sampling flow rate 1-2 cJ/sec ■Cumulative particles PCD400 Probe human power 6 Sample selection 1-99 seconds 20 worn clean clothes Both bathtubs after EO-Gas sterilization. I used the original product.

Specifications Toshi made Yabaret) (Top) 1300 (Bottom) N
o, 1350 Hat, glove, cover, mask material are all 5A-100 e, Vipul container transport trolley Corrosion-resistant aluminum W400XL600XH180mm Casters Fluororesin diameter 80mm Vipul 100mm perforated stainless steel bats, 60 pieces per pack x 5 pads Total height: Approximately 500 yen above the floor. Before entering the air shower room, the vial-equipped transport vehicle was allowed to enter the room after passing over Paso F impregnated with Tego 51B 1000 times diluted solution.

(3) Experimental results as shown in the table below. Note that measurement points A to J are not shown in FIGS. 8A and 8B. Also, the measured values at measurement points F and J are 10
This is the amount of dust generated in all rooms per second.

(Note) ■ All objects to be measured are measured in a stationary state, and each measurement point is 6
Simultaneously measure 4 to 6 locations using two probe inputs.

■Counts of 5 or less are treated as O, and counts of 9 or less was treated as 5.

(Example) 113 → 110. 198 → 195 The above experimental results show that, as explained earlier, the improved nozzle compared to the conventional nozzle does not perform the oscillating movement of the air injection port 10, and the injected air flow This is a nozzle that creates a swirling flow. Therefore, it is best to consider that the effect of removing attached dust is inferior to that of the nozzle of the present invention, in which the jetted air flow is a double swirling flow. However, despite this improved nozzle, the above As is clear from the experimental results, the removal effect of attached dust is significantly improved compared to the conventional nozzle. Therefore, it is easy to understand that the air shower nozzle of the present invention, which can make the jetted air flow into a double swirling flow, can be expected to have a much higher dust removal effect than the above experimental results.

As described above, when using the nozzle of the present invention to inject air onto an object to be cleaned, compared to the case of using a conventional nozzle that simply injects air in a laminar flow, it is possible to reduce the amount of adhesion from the object to be cleaned. The dust removal effect is significantly improved. As a result, there is no need to unnecessarily increase the flow velocity of the injected air, leading to energy savings. In particular, the air shower device using the nozzle of the present invention can provide a sufficient effect of removing adhering dust on the opposite side of the object to be cleaned, that is, the back surface where the air flow collides, even at °C. It can also be fully utilized as a cleaning device for objects in situations where it is not possible to spray a stream of water.

Although ball bearings 16 are used to rotatably support the nozzle body 8, for example, as shown in FIG.
Two annular flexible supports 1 that rotatably support
57a and 151b can be installed inside the annular holding part 15 of the casing 9, and the nozzle body 8 can be supported by each sphere 56 of both annular flexible supports 157a and 37b. In this case, since the nozzle body 8 can rotate in any direction around the spherical center of the spherical cylindrical portion 11, the rotation of the nozzle body 8 is controlled by the two-stage annular flexible support 15 as shown in the figure.
It is necessary to attach a guide 68 to the outer periphery of the nozzle body 8, which restricts only the rotation of the nozzle bodies 7a and 51b around the common central axis 37C.

Further, as shown in FIG. 10, the nozzle body 8 can be rotated using a large number of wheels or rollers 40 that are rotatable around a support axis parallel to the rotation center axis 59 of the nozzle body 8.
You can also support this. In this case as well, the guide 41 is a key point for the same reason as in item n:1.
If the wheel or roller 42 is configured to roll on the inner cover plate 18 of the annular retainer 61N3, the nozzle body 80 can be rotated extremely smoothly.

In each of the above embodiments, since the nozzle body of a conventional bunker louver was used as the nozzle body 8, the spherical cylindrical portion 11 thereof was configured to be rotatably supported. However, since the nozzle body 8 itself is newly manufactured, If so, the nozzle body 8 can be mounted at a location supported by the casing 9 in a cylindrical shape concentric with the rotation center axes 16c, 57c, 39.

[Brief explanation of drawings]

Figure 1 is a front view showing an example of the use of a general air shower nozzle, Figure 2 is a diagram explaining the flow of air sprayed in a laminar flow around an object to be cleaned, and Figure 3 is a front view of a typical air shower nozzle. A front view of an air shower nozzle according to an embodiment of the invention, FIG. 4 is a vertical side view of the same part, FIG. 5 is a cross-sectional front view of the same, and FIG. 6 is a side view showing a rotary blade and a support bracket. FIG. 7 is a diagram illustrating the flow of the double swirling air flow around the object to be cleaned obtained by the nozzle of the present invention, FIGS. 8A and B are diagrams showing the measurement points for the object during the experiment, and FIG. Figures 1 and 10 are partially longitudinal sectional side views of main parts showing embodiments on each side. 1...Object to be cleaned, 2...Air chamber, 6.
... Air nozzle, 4... Sirocco fan, 5... Laminar air flow, 6... Negative pressure space, 8... Nozzle body, ? ... Mounted on the casing, 10... Air injection port, 11... Spherical cylindrical part, 12... Central axis of the nozzle body, 15... Annular holding part, 14... Mounted on the seat. ,
16...Ball bearing, 16c, +57c, 39
...Rotation center axis of the nozzle body, 22...Rotor blade,
23...Shaft portion, 24...Blade, 25...Bracket, 28...Bracket mounting screw, 60...7 cut-and-raised pieces for preventing bracket rotation, 31...Fixed wing,
62...Fixed wing installation is seat, 66...Blade, 54a.
... Thin swirling air flow, i54... Double swirling air flow, 3
6... Freely rotating sphere, 37a, 2>7b... Annular support, 58.41... Nozzle body rotation regulation guide,
40.42...Wheel or roller patent applicant/
Hayashi Shiki Company Sugiyama Painting Co., Ltd. Patent Applicant Arunaeki Co., Ltd. No. 2 Fig. 8 A No. 91 g +0 sauce

Claims (1)

[Claims] The nozzle body is rotatably supported so that the air injection port can oscillate, and there are fixed wings that rotate the nozzle body in response to the air flow flowing through the nozzle body. An air shower nozzle comprising a rotary blade rotated by air to swirl the air flow flowing out from the air injection port.