JP2014098519A - Induced airflow generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induced airflow generator capable of changing a flow direction of uniform airflow flowing in a space.SOLUTION: An induced airflow generator 4 suctions part of uniform airflow flowing in a guide 3 and discharges the suctioned airflow to an end side of the guide 3 to generate an airflow with a direction having an angle in a range of an angle of a direction perpendicular to a direction of the uniform airflow to an angle of the same direction as the direction of the uniform airflow. Whereby the induced airflow generator 4 induces the uniform airflow near the airflow to change a flow direction of part of the uniform airflow.

Description

  The present invention relates to an induced airflow generation device.

  Conventionally, a clean bench is often used as an apparatus for improving the air cleanliness of a local work space. In a general clean bench, only the front surface of the work table is a work opening, and the other surfaces are enclosed to maintain cleanliness. In such a clean bench, a clean air outlet is arranged in the enclosure, and an operator works by putting his hand through the opening for work in front.

  However, since the work opening of the clean bench is narrow, there is a problem in workability when an operator performs assembly work of a precision machine. In addition, when products and manufactured parts are moved as in a production line, measures such as putting the entire line into a clean room have been taken, but this has the problem that the facility becomes large-scale. is there.

  For this reason, the air flow opening surfaces of a pair of push hoods that can blow out a uniform flow of purified air are arranged to face each other, and the air flows from the respective air flow opening surfaces collide with each other. There has been proposed a local air cleaning device that can make a region between the push hoods into a clean air space having a higher cleanliness than other regions (Patent Document 1).

JP 2008-275266 A

  By the way, in some production lines arranged in the clean air space, dust may be generated by operating an apparatus in the production line. Dust generated from such a device rides on the airflow and flows downstream. As a result, the clean air space on the downstream side of the apparatus is contaminated. In such a case, if the direction of the flow of the uniform air flow including the generated dust can be changed, it is possible to prevent the inside of the space where the cleanliness on the downstream side of the apparatus is to be kept high from being contaminated. For this reason, the technique which can change the direction of the flow of the uniform airflow which flows in the space is calculated | required.

  This invention is made | formed in view of the said problem, and it aims at providing the induced airflow generator which can change the direction of the flow of the uniform airflow which flows in the space.

In order to achieve the above object, an induced airflow generation device according to the first aspect of the present invention includes:
A part of the uniform air flow flowing in the space is sucked and the sucked air flow is discharged to the end side of the space, and an angle between a direction perpendicular to the flow of the uniform air flow and the same direction is set. By generating an airflow in the direction of the airflow, a uniform airflow in the vicinity of the airflow is induced, and the direction of the flow of the uniform airflow in the vicinity of the airflow is changed.

  It is preferable that the air flow to be discharged is a uniform air flow.

An induced airflow generation device according to a second aspect of the present invention is:
A portion of the uniform airflow flowing in the space is sucked and the sucked airflow is discharged out of the space, and has an angle between a direction perpendicular to the uniform airflow and the same direction. By generating an air flow, a uniform air flow in the vicinity of the air flow is induced, and the direction of the flow of the uniform air flow in the vicinity of the air flow is changed.

  According to the present invention, it is possible to change the direction of the flow of the uniform airflow that flows in the space.

It is a figure which shows an example of the local air cleaning apparatus using the induced airflow generator which concerns on embodiment of this invention. It is a figure which shows the structure of a push hood. It is a figure which shows an example of the induced airflow generator which concerns on embodiment of this invention. It is a figure which shows the flow of the air in a local air cleaning apparatus. It is a figure which shows another example of an induced airflow generator. It is a figure which shows another example of an induced airflow generator. 3 is a plan view showing a measurement position in Example 1. FIG. 6 is a side view showing a measurement position in Example 1. FIG. It is a figure which shows the principal part of the local air cleaning apparatus of Example 2. FIG. It is a figure which shows the induced airflow generator of Example 2. It is a figure which shows the principal part of the local air cleaning apparatus of Example 3. FIG. It is a figure which shows the induced airflow generator of Example 3.

  Hereinafter, the induced airflow generator of the present invention will be described with reference to the drawings. In the present embodiment, a case where an induced airflow generation device capable of changing the direction of the flow of a uniform airflow flowing in the space of the present invention is used as a local air cleaning device will be described as an example. FIG. 1 is a diagram showing an example in which the induced airflow generation device of the present invention is used in a local air cleaning device. First, the local air cleaning device will be briefly described.

  As shown in FIG. 1, the local air cleaning device 1 includes a push hood 2 disposed so as to face an air collision surface W such as a wall or a partition, and a guide 3 provided on the push hood 2. ing. An induced airflow generation device 4 is accommodated in the guide 3. In the present embodiment, the present embodiment will be described by taking as an example the case where a table 5 is arranged in the guide 3 and a device 6 as a dust generation source for generating dust is installed on the table 5. .

  The push hood 2 only needs to have a mechanism for blowing out a purified uniform air flow. The push hood 2 that has been used in a push-pull type ventilator has a basic structure and a cleaning filter is provided inside. A structure can be adopted.

  The uniform air flow and the uniform flow mentioned here are synonymous with the uniform flow described in “Factory ventilation” by Taro Hayashi (published in 1982 by the Society for Air Conditioning and Hygiene Engineering). It means the flow of light wind speed that does not occur. However, the present invention is not intended to provide an air blowing device that strictly defines the flow velocity and velocity distribution of air. The uniform air flow preferably has, for example, a variation in velocity distribution with no obstacles within ± 50%, more preferably within ± 30% of the average value.

  According to the push hood 2 of the present embodiment, the nine push hoods (3 vertical × 3 horizontal) are connected in the same direction in the air flow opening surface, and the short sides of the push hood are long. The sides are arranged and connected so that they are adjacent to each other. FIG. 2 shows the structure of the push hood 2a. The structure of the other connected push hoods 2 is basically the same.

  As shown in FIG. 2, the housing 21 of the push hood 2a is formed in a substantially rectangular parallelepiped shape, and an airflow suction surface 22 is formed on one surface thereof. For example, the air flow suction surface 22 includes a surface in which a plurality of holes are formed on the entire surface of the housing 21. The air flow suction surface 22 takes in outside air and room air, which are ambient air outside the push hood 2a, from this hole. An air blowing surface (air flow opening surface) 23 is formed on the other surface of the housing 21 that faces the air flow suction surface 22. For example, the air flow opening surface 23 includes a surface in which a plurality of holes are formed on the entire surface of the housing 21. On the air flow opening surface 23, a uniform air flow of clean air formed in the push hood 2a is blown out of the push hood 2a from this hole. Although the magnitude | size of the airflow opening surface 23 of the push hood 2a is not specifically limited, For example, it is 1050 mm x 850 mm.

  The push hood 2 is arranged so that the air flow opening surface 23 faces the air collision surface W such as a wall. Here, the fact that the air flow opening surface 23 faces the air collision surface W is not limited to the state where the air flow opening surface 23 of the push hood 2 and the air collision surface W face each other. 2 in which the air flow opening surface 23 and the air collision surface W are slightly inclined. The inclination of the air flow opening surface 23 and the air collision surface W of the push hood 2 is preferably within the range of about 30 ° formed by the air flow opening surface 23 and the air collision surface W.

A blower mechanism 24, a high-performance filter 25, and a rectifying mechanism 26 are disposed in the housing 21.
The air blowing mechanism 24 is disposed on the air flow suction surface 22 side in the housing 21. The blower mechanism 24 includes a fan for blowing air. The blower mechanism 24 takes in outside air or room air, which is ambient air around the push hood 2a, from the airflow suction surface 22 and blows out an airflow from the airflow opening surface 23. The blower mechanism 24 is formed so that the flow velocity of the airflow blown out from the airflow opening surface 23 can be varied by controlling the blowing force of the fan.

  The high performance filter 25 is disposed between the air blowing mechanism 24 and the rectifying mechanism 26. The high-performance filter 25 is composed of a high-performance filter according to the cleaning level, such as a HEPA filter (High Efficiency Particulate Air Filter) or a ULPA filter (Ultra Low Penetration Air Filter) for filtering the ambient air taken in. . The high performance filter 25 cleans the ambient air taken in by the blower mechanism 24 to clean air having a desired cleaning level. The clean air cleaned to a desired cleaning level by the high-performance filter 25 is sent to the rectifying mechanism 26 by the blower mechanism 24.

  The rectifying mechanism 26 is disposed between the high performance filter 25 and the air flow opening surface 23. The rectifying mechanism 26 includes an air resistor (not shown), and is formed of a punching plate, a net member, or the like. The rectifying mechanism 26 is blown from the high-performance filter 25 and blown air that is biased in the air flow rate with respect to the entire air flow opening surface 23 is made uniform with no air flow rate bias in the entire air flow opening surface 23. Correct (rectify) the air flow (uniform air flow). The rectified uniform air flow is blown out of the push hood 2 from the entire air flow opening surface 23 by the blower mechanism 24.

  Further, as shown in FIG. 2, the push hood 2 a preferably has a pre-filter 27 disposed between the air flow suction surface 22 in the housing 21 and the air blowing mechanism 24. An example of the prefilter 27 is a medium performance filter. By disposing the pre-filter 27 between the air flow suction surface 22 and the air blowing mechanism 24, relatively large dust contained in the ambient air sucked into the housing 21 through the air flow suction surface 22 can be removed. It is possible to maintain the performance of the high-performance filter 25 that is likely to be clogged for a long period of time.

  In the push hood 2 a configured as described above, the ambient air taken in by the blower mechanism 24 is cleaned by the pre-filter 27 and the high-performance filter 25 to clean air having a desired cleaning level. Then, the cleaned clean air is rectified into a uniform air flow by the rectifying mechanism 26. The uniform air flow thus cleaned is blown outward from the entire air flow opening surface 23 to the air flow opening surface 23 of the push hood 2a in a substantially vertical direction.

  One end of the guide 3 is provided on the air flow opening surface 23 side of the push hood 2. Further, the guide 3 is provided on the air flow opening surface 23, extends from there to the downstream side of the uniform air flow blown from the air flow opening surface 23, and covers the outer peripheral contour portion of the air flow opening surface 23. It is formed as follows. For example, when the shape of the air flow opening surface 23 is a quadrangle, the air flow opening surface 23 is formed so as to have a U-shaped cross section. This U-shaped open side and floor surface include an outer peripheral contour portion in the direction of uniform air flow, and around the air flow in parallel with the uniform air flow that is blown from there. It will be in a state of being surrounded by a tunnel. The guide 3 is formed so as to have an open area between the other end (opening surface 31).

  The guide 3 can be formed of any material as long as the air flow blown out from the opening surface 31 can maintain the state of the purified uniform air flow from the air flow opening surface 23. Is possible. The guide 3 may not completely cover the entire periphery of the uniform air flow as long as it can maintain the state of the clean uniform air flow from the air flow opening surface 23. A hole may be opened in a part or a slit may be formed.

  The guide 3 is disposed such that the opening surface 31 faces the air collision surface W. By arranging the opening surface 31 so as to face the air collision surface W, the air flow blown out from the opening surface 31 collides with the air collision surface W. For example, when the opening surface 31 is directly opposed to the wall, the uniform air flow exhibits a behavior of changing the flow direction substantially vertically when it collides with the air collision surface W. By flowing in this way, the air flow that collided with the air collision surface W flows out to the outside of the collided surface. As a result, a clean space is obtained in the region from the surface where the airflow collides to the end of the opening surface 31.

  The shape of the opening surface 31 is preferably formed so as to be substantially the same shape as the air flow opening surface 23. This is because by making the opening surface 31 and the airflow opening surface 23 substantially the same shape, it is easy to maintain a uniform airflow state blown from the airflow opening surface 23 on the opening surface 31.

  As shown in FIG. 1, the guide 3 configured in this way is provided (attached) from the air flow opening surface 23 side of the push hood 2 toward the downstream side of the uniform air flow, and its downstream end It arrange | positions so that the opening surface 31 provided in the part may oppose the air collision surface W. FIG. Thereby, an open area is formed between the opening surface 3 and the air collision surface W.

  The induced airflow generation device 4 sucks a part of the uniform airflow flowing in the guide 3 and the uniform airflow that flows the sucked airflow in the end portion side of the guide 3, that is, in the space formed by the guide 3. Is discharged to the peripheral edge side (upper and lower left and right ends) of the surface perpendicular to the flow. In the present embodiment, the induction airflow generation device 4 is disposed inside the guide 3 and downstream of the device 6 that generates dust. FIG. 3 shows an example of the structure of the induced airflow generation device 4. As shown in FIG. 3, the induced airflow generation device 4 includes a frame 43 having an introduction portion 41 and a discharge portion 42, a fan 44 accommodated in the frame 43, and air discharged from the fan 44 as a discharge portion 42. A wind guide plate 45 that leads to

  A plurality of through holes are formed in the introduction part 41, and air outside the introduction part 41 is sucked into the frame 43 through the introduction part 41 by the operation of the fan 44 accommodated in the frame 43. The introduction portion 41 is disposed below the downstream side of the device 6 so that a part of the uniform air flow including dust generated from the device 6 can be sucked into the frame 43. As a result, a negative pressure area 46 is generated on the downstream side of the device 6, and a part of the uniform air flow including dust generated from the device 6 is sucked into the frame 43 through the negative pressure area 46 and the introduction portion 41. The

  A plurality of through holes are formed in the discharge portion 42, and the air on the downstream side of the fan 44 is discharged to the end portion side of the guide 3 by the operation of the fan 44 accommodated in the frame 43. The through hole of the discharge part 42 is preferably inclined toward the downstream side of the uniform air flow so that the air discharged to the outside of the frame 43 flows along the uniform air flow flowing in the guide 3. . Moreover, it is preferable that the discharge part 42 is discharged as a uniform air flow. This is because the effect of induction is enhanced by discharging the air as a uniform air flow. In this example, the discharge part 42 is formed in an oblique honeycomb structure.

  The fan 44 is composed of an air blowing fan or the like. The fan 44 is disposed on the introduction part 41 side in the frame 43. The fan 44 takes in air outside the introduction portion 41 and forms a negative pressure area 46 on the downstream side of the device 6. Moreover, the fan 44 blows out the air taken in from the introduction part 41 to the discharge part 42 side. The fan 44 is formed so that the amount of air introduced from the introduction part 41 and discarded from the discharge part 42 can be varied by controlling the blowing force.

  The air guide plate 45 is disposed on the downstream side of the fan 44. The air guide plate 45 is formed, for example, in a plate shape, regulates the discharge direction of the air discharged from the fan 44, and guides the air discharged from the fan 44 to the discharge unit 42.

  FIG. 4 is a diagram showing the flow of air in the local air cleaning device 1 when the induced airflow generation device 4 configured as described above is provided. In the present embodiment, a device 6 for generating dust is installed on the table 5 in the guide 3.

  As shown in FIG. 4, the air outside the introduction portion 41 is taken into the frame 43 by driving the fan 44 of the induced airflow generation device 4. For this reason, a negative pressure area 46 is formed on the downstream side of the device 6. A part of the uniform air flow including the dust P generated from the device 6 is guided to the negative pressure area 46 formed on the downstream side thereof. The uniform air flow including the dust P guided to the negative pressure area 46 is accommodated in the frame 43 of the induction airflow generation device 4 through the through hole of the introduction part 41, and the frame through the through hole of the discharge part 42. 43 is discharged outside. The air containing the dust P discharged out of the frame 43 flows in the vicinity of the bottom of the local air cleaning device 1.

  Furthermore, an air flow having an angle between a direction perpendicular to the direction of the uniform air flow and the same direction is generated. The generation of this air flow induces a uniform air flow in the vicinity of this air flow, and changes the direction of the uniform air flow to the bottom side. For this reason, the direction of the flow of uniform airflow can be changed by the induced airflow generated by the induced airflow generation device 4. As a result, it is possible to prevent the inside of the space where the cleanliness on the downstream side of the device 6 is desired to be kept high from being contaminated.

  Here, since the through-hole of the discharge part 42 is inclined toward the downstream side of the air flow, the air including the dust P discharged from the discharge part 42 comes into contact with the uniform air flow flowing in the guide 3. Thus, the air flows near the bottom of the local air cleaning device 1 without generating turbulent flow, and is discharged out of the guide 3. Thus, even if the device 6 that generates the dust P is disposed inside the local air cleaning device 1, the air containing the dust P generates turbulent flow near the bottom of the local air cleaning device 1. Therefore, it is possible to prevent the inside of the space where the cleanliness on the downstream side of the apparatus 6 is to be kept high from being contaminated.

  As described above, according to the induced airflow generation device 4 of the present embodiment, the flow direction of a part of the uniform airflow can be changed to the bottom side. For this reason, even if the device 6 that generates the dust P is arranged inside the local air cleaning device 1, the inside of the space in which the cleanliness on the downstream side of the device 6 is desired to be kept high is prevented from being contaminated. Can do.

  The present invention is not limited to the above embodiment, and various modifications and applications are possible. Hereinafter, other embodiments applicable to the present invention will be described.

  In the above embodiment, the present invention has been described by taking the guided airflow generation device 4 in which the discharge portion 42 is provided at the lower portion of the frame 43 as an example. However, the discharge portion 42 of the induced airflow generation device 4 is discharged from the discharge portion 42. As long as the air can be discharged to the end side of the local air cleaning device 1 (guide 3), for example, as shown in FIG. Moreover, the airflow generator 4 may be capable of discharging the air discharged from the discharge unit 42 to the upper end or the left and right end portions of the local air cleaning device 1 (guide 3). Also in these cases, the direction of a part of the uniform air flow can be changed, and the inside of the space where the cleanliness downstream of the device 6 is desired to be kept high can be prevented from being contaminated.

  In the said embodiment, although this invention was demonstrated to the case where the local air cleaning apparatus 1 was provided with one induced airflow generator 4, the induced airflow generator 4 provided in the local air cleaner 1 is demonstrated. The number of may be plural. For example, as shown in FIG. 6, the local air cleaning device 1 may be provided with two induced airflow generation devices 4a and 4b.

  In the above embodiment, the present invention has been described by taking as an example the case where the device 6 for generating dust is installed on the table 5 disposed in the guide 3. For example, the downstream side of the air flow opening surface 23 is described. The present invention can be applied even when a device 6 that generates dust is installed on the floor, and is limited to a case where the device 6 is installed on a table 5 arranged in the guide 3. It is not a thing.

  In the said embodiment, although this invention was demonstrated to the case where the apparatus 6 as a dust generation source which generate | occur | produces dust in the guide 3 was installed as an example, the local air cleaning apparatus which does not have a dust generation source 1 can be applied.

  In the said embodiment, although this invention was demonstrated to the case where the air discharged | emitted from the induction | guidance | derivation airflow generator 4 (discharge part 42) is discharged | emitted to the edge part side of the local air cleaning apparatus 1 (guide 3), For example, the discharge part 42 of the induced airflow generation device is disposed outside the guide 3 so that the air sucked by the induction airflow generation device 4 is discharged to the outside of the local air cleaning device 1 (guide 3). Also good.

  In the above-described embodiment, the present invention has been described by taking as an example the case where the induced airflow generation device 4 is used for the local air cleaning device 1 arranged so that the push hood 2 and the air collision surface W face each other. For example, the air collision surface W does not have to be provided as long as a uniform airflow flows therein. Further, the guide 3 may not be provided.

  The local air cleaning device is not limited to the local air cleaning device 1 arranged so that the push hood 2 and the air collision surface W face each other. For example, a pair of push hoods 2 face each other. You may use the local air purification apparatus 1 arrange | positioned in this way. Moreover, you may use the local air purification apparatus 1 arrange | positioned so that a pair of push hood 2 may oppose, and the guide 3 was each provided in each push hood 2. As shown in FIG. Furthermore, you may use the local air purification apparatus 1 arrange | positioned so that a pair of push hood 2 may oppose, and the guide 3 is not provided in each push hood 2. FIG. Moreover, you may use the local air purification apparatus 1 which is arrange | positioned so that the push hood 2 and the air collision surface W may oppose, and the guide 3 is not provided in the push hood 2. FIG. Furthermore, you may use the local air purification apparatus which is arrange | positioned so that a push hood and a pull hood may oppose and the guide is not provided in a push hood and a pull hood.

Further, the present invention is also suitable as a local air cleaning device including the induced airflow generation device 4. For example,
A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
A guide that is provided on the air flow opening surface side of the push hood, extends from the air flow opening surface side toward the downstream side of the uniform air flow, and forms an opening surface at a downstream end portion;
The push hood is configured so that the purified uniform air flow blown from the air flow opening surface collides with the air collision surface on the downstream side of the opening surface of the guide after passing through the guide. Arranged,
By forming the opening surface of the guide facing away from the air collision surface, an open area is formed between the opening surface of the guide and the air collision surface,
The cleaned uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, so that another region is formed in the guide and the open region. Higher cleanliness than
A local air cleaning device, wherein an induced airflow generation device is provided in the guide.

A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
A guide that is provided on the air flow opening surface side of the push hood, extends from the air flow opening surface side toward the downstream side of the uniform air flow, and forms an opening surface at a downstream end portion;
The push hood is a pair of push hoods, which are arranged so that the air flow opening surfaces thereof face each other,
The guide is provided on the air flow opening surface side of one push hood of the pair of push hoods,
The opening surface of the guide and the air flow opening of the push hood not provided with the guide are made to face the air flow opening surface of the push hood where the guide is not provided apart from the air flow opening surface of the push hood. Forming an open area with the surface,
The cleaned uniform air flow blown out from the respective air flow opening surfaces collides in the open region and flows out of the open region, thereby causing the inside of the guide and the open region to flow. Higher cleanliness than other areas,
A local air cleaning device, wherein an induced airflow generation device is provided in the guide.

A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
A guide that is provided on the air flow opening surface side of the push hood, extends from the air flow opening surface side toward the downstream side of the uniform air flow, and forms an opening surface at a downstream end portion;
The push hood is a pair of push hoods, which are arranged so that the air flow opening surfaces thereof face each other,
The guides are a pair of guides provided on each air flow opening surface side of the pair of push hoods,
By forming the opening surfaces of the pair of guides to be spaced apart from each other, an open area is formed between the opening surfaces of the guides,
The cleaned uniform air flow blown out from the respective air flow opening surfaces collides in the open region and flows out of the open region, thereby causing the inside of the guide and the open region to flow. Higher cleanliness than other areas,
A local air cleaning device, wherein an induced airflow generation device is provided in the guide.

A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
The push hood is a pair of push hoods, and the air flow opening surfaces of the push hoods are arranged so as to be opposed to each other,
The cleaned uniform air flow blown out from the respective air flow opening surfaces collides in the region where the air flow opening surfaces are opposed to each other and flows out of the opposed regions. With a higher cleanliness than other areas,
A local air cleaning device, wherein an induced air flow generation device is provided on the downstream side of the air flow opening surface.

A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
The push hood is arranged so that the purified uniform air flow blown out from the air flow opening surface collides with an air collision surface on the downstream side of the air flow opening surface,
By forming the air flow opening surface of the push hood away from and facing the air collision surface, an open area is formed between the air flow opening surface of the push hood and the air collision surface,
The cleaned uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, thereby comparing the inside of the open region with other regions. High cleanliness,
A local air cleaning device, wherein an induced air flow generation device is provided on the downstream side of the air flow opening surface.

A push hood having an air flow opening surface for blowing a cleaned uniform air flow;
A pull hood having a suction opening surface for sucking a uniform air flow discharged from the push hood,
The push hood is arranged so that the air flow opening surface of the push hood and the suction opening surface of the pull hood are spaced apart from each other,
The uniform air flow blown out from the air flow opening surface of the push hood is sucked into the suction opening surface of the pull hood, so that the air flow opening surface of the push hood and the suction opening of the pull hood The area facing the surface has a higher degree of cleanliness than other areas,
A local air cleaning device, wherein an induced air flow generation device is provided on the downstream side of the air flow opening surface.

  Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention.

Example 1
Using the local air cleaning device 1 having the induced airflow generation device 4 shown in FIGS. 7 and 8, the cleanliness at nine measurement points at three measurement heights was measured. The push hood of the local air cleaning device 1 is a push hood having a width of 1050 mm and a length of 850 mm, the air flow opening surface of which is the same direction, and the short sides and the long sides of the push hood are adjacent to each other. They are arranged and connected (9 vertical x 3 horizontal), and the size of the opening surface 31 is 3150 mm wide and 2550 mm high. In the local air cleaning device, a cleaned uniform air flow flows at a speed of 0.3 m / s to form a clean space. 6 × 10 ⁶ / m ³ atmospheric dust is generated from the dust generation position in the clean space, and the air current is sucked from the upper part of the induction air flow generator 4 provided on the downstream side and discharged from the lower part in the clean space. To do. For the measurement of cleanliness, LASAIR-II manufactured by PMS was used, and the number of dust particles (particles / m ³ ) having a particle diameter of 0.3 μm at each measurement point was measured. The measurement results are shown in Table 1. The measurement was performed twice.

  As shown in Table 1, it was confirmed that the local air cleaning device 1 can be prevented from being contaminated by providing the induced airflow generation device 4 so as to prevent contamination of the space in which the cleanliness downstream of the dust generation position is to be kept high. . Part of the dust remained at a position 400 mm from the floor, but at a position 900 mm from the floor at the same height as the dust generation position, the dust was not counted and the cleanliness downstream of the dust generation position was increased. It was confirmed that it was possible to prevent the inside of the space to be kept from being contaminated.

(Example 2)
Using the local air cleaning device 1 shown in FIG. 9, the cleanliness was measured at three measurement points B having different heights shown in FIG. In the present embodiment, atmospheric dust was generated from the dust generation position, and the air flow was sucked from the upper part of the induction air flow generation device 4 provided on the downstream side and discharged out of the clean space. Further, 2.6 × 10 ⁷ particles / m ³ (ISO class 8 or less) atmospheric dust was generated from the dust generation position, and the number of particles (particles / m ³ ) having a particle diameter of 0.3 μm at the measurement point B was measured. . The distance between the end of the table 5 and the measurement point B was 2.6 m, and the flow rate of the cleaned uniform air flow was 0.3 m / s. For reference, the cleanliness was also measured at the measurement point A downstream from the dust generation position. The results are shown in Table 2.

(Example 3)
The cleanliness was measured at measurement point A and three measurement points B having different heights in the same manner as in Example 2 except that the local air cleaning device 1 shown in FIG. 11 was used. In addition, as FIG. 12 shows the structure of the induced airflow generation device 4 of the second embodiment, the local air cleaning device 1 of the third embodiment is provided with two induced airflow generation devices 4. This is different from the local air purifying apparatus 1. Table 1 shows the measurement results of cleanliness of Example 3.

As shown in Table 2, by providing the induced airflow generator 4 (guided airflow generators 4a and 4b) in the local air cleaner 1, the space where the cleanliness downstream of the dust generation position is to be kept high is contaminated. It was confirmed that it can be prevented. In Example 2, the number of particles of about 3.0 × 10 ³ (ISO class 5) was sometimes measured at the measurement point B at H = 400 mm. This is considered to be because dust was guided to a position lower than 400 mm because the guided airflow devices 4a and 4b were provided in two stages in Example 3. However, even in Example 2, at a position 900 mm from the floor at the same height as the dust generation position, dust is not counted, and the space where the cleanliness downstream of the dust generation position is desired to be kept high is contaminated. Can be prevented.

(Example 4, Comparative Example 1)
The cleanliness at each measurement point was measured in the same manner as in Example 1 except that the cleanliness was measured with the number of dust particles having a particle diameter of 0.1 μm (pieces / m ³ ). For comparison, the cleanliness at each measurement point was measured in the same manner when the induced airflow generation device 4 was stopped. Note that the number of dust particles (particles / m ³ ) at a dust generation position of 0.1 μm was 1.5 × 10 ⁸ particles / m ³ . The measurement results of Example 4 are shown in Table 3, and the measurement results of Comparative Example 1 are shown in Table 4.

  As shown in Tables 3 and 4, by providing the local air cleaning device 1 with the induced airflow generation device 4, it is possible to prevent the inside of the space where the cleanliness downstream of the dust generation position is desired to be kept high from being contaminated. It was confirmed. In addition, although there was a part where the number of dust increased at a position 400 mm from the floor, the number of dust decreased at a position 900 mm from the floor at the same height as the dust generation position, and the cleanliness downstream of the dust generation position. It was confirmed that it was possible to prevent the inside of the space where it was desired to keep high from being contaminated. Further, as shown in Tables 1 and 3, it was confirmed that the same results were obtained even when the particle size in the measurement of cleanliness was changed.

  The present invention is useful for air cleaning a local work space.

DESCRIPTION OF SYMBOLS 1 Local air purification apparatus 2, 2a Push hood 3 Guide 21 Housing 22 Air flow suction surface 23 Air blowing surface (air flow opening surface)
24 Blower mechanism 25 High-performance filter 26 Rectifier mechanism 27 Pre-filter 31 Opening surface 4 (4a, 4b) Inductive airflow generator 41 Introducing section 42 Discharging section 43 Frame 44 Fan 45 Air guide plate 46 Negative pressure area 5 Table 6 Apparatus W Air Collision surface

Claims (3)

  A part of the uniform air flow flowing in the space is sucked and the sucked air flow is discharged to the end side of the space, and an angle between a direction perpendicular to the flow of the uniform air flow and the same direction is set. An induced airflow generation device characterized by inducing a uniform airflow in the vicinity of the airflow by changing the direction of the flow of the uniform airflow in the vicinity of the airflow by generating an airflow in the direction of the airflow.   The induced airflow generation device according to claim 1, wherein the discharged airflow is a uniform airflow.   A portion of the uniform airflow flowing in the space is sucked and the sucked airflow is discharged out of the space, and has an angle between a direction perpendicular to the uniform airflow and the same direction. An induced airflow generation device characterized by inducing a uniform airflow in the vicinity of the airflow by generating an airflow and changing the direction of the flow of the uniform airflow in the vicinity of the airflow.