Technical Field
[0001] The present disclosure relates to a local air cleaning apparatus.
Background Art
[0002] Conventionally, a clean bench is often used as an apparatus for improving
air cleanliness of a local work space. In a typical clean bench, on only a front side of a
10 working table is provided an opening for work, and sides thereof other than the front side
form an enclosure in order to maintain cleanliness. In such a clean bench, a clean air
blowing outlet is arranged within the enclosure, and a worker puts his or her hands
therein from the front opening for work and then performs the work.
[0003] However, the opening for work in the clean bench is narrow. Accordingly,
15 there is a problem in terms of workability when workers perform assembly work of a
precision instrument or the like. In addition, as in a production line, when work
involves transfer of manufactured products or manufactured components, procedures
such as arranging the entire line in the clean room have been taken. However, this leads
to a problem with large-scale equipment.
20 [0004] Thus, a local air cleaning apparatus has been proposed in which air flow
opening faces of a pair of push hoods that can blow out a uniform flow of cleaned air are
arranged opposite to each other to cause air flows from the each air flow opening face to
collide with each other, thereby being able to make a region between the pair of push
hoods a clean air space having a higher level of cleanliness than in other regions (Patent
25 Literature 1).
Citation List
Patent Literature
DIVISIONAL APPLICATION DIVIDED OUT OF INDIAN PATENT APPLICATION NO. 4988/DELNP/2015
3
[0005] Patent Literature 1: Unexamined Japanese Patent Application Kokai
Publication No. 2008-275266
Summary of Invention
Technical Problem
5 [0006] Meanwhile, although a local air cleaning apparatus can make a work space a
clean air space in a short time, depending on the worker, he or she may desire to maintain
an inside of the work space constantly at a high level of cleanliness even during a time
when he or she is off work. In such a case, when the worker is not working in the work
space, power consumption of the local air cleaning apparatus is desired to be reduced as
10 much as possible.
[0007] The present disclosure has been accomplished in view of the above
circumstances. It is an objective of the present disclosure to provide a local air cleaning
apparatus that can reduce power consumption while maintaining a clean air space at a
high level of cleanliness.
15 Solution to Problem
[0008] In order to achieve the above objective, a local air cleaning apparatus
according to a first aspect of the present disclosure includes:
a push hood including an air flow opening face that blows out a cleaned uniform
air flow; and
20 a guide provided on a side of the push hood having the air flow opening face and
extending from the side thereof having the air flow opening face to a downstream side of
the uniform air flow to form an opening face at an end portion of the downstream side,
in which the push hood is arranged such that the cleaned uniform air flow blown
out from the air flow opening face passes through inside the guide and then collides with
25 an air collision face on a downstream side of the opening face of the guide; the opening
face of the guide is spaced apart from and opposite to the air collision face to form an
open region between the opening face of the guide and the air collision face; and
4
the cleaned uniform air flow blown out from the air flow opening face collides with the
air collision face to flow outside the open region, so as to cause cleanliness to be higher
inside the guide and inside the open region than other regions, wherein
the local cleaning apparatus includes at least one of a device for measuring
5 pressures inside the guide and inside the push hood, a device for measuring the
cleanliness inside the guide or of the open region, and a device for measuring a gap area
between the guide and the air collision face; and
to ensure the cleanliness from a result of the measurement, the local cleaning
apparatus controls such that a flow velocity of the cleaned uniform air flow blown out
10 from the air flow opening face can be decelerated or accelerated.
[0009] A local air cleaning apparatus according to a second aspect of the present
disclosure includes:
a pair of push hoods each including an air flow opening face that blows out a
cleaned uniform air flow; and
15 a guide provided on a side of each of the pair of push hoods having the air flow
opening face side and extending from the side of each of the pair thereof having the air
flow opening face to a downstream side of the uniform air flow to form an opening face
at an end portion of the downstream side,
in which the opening faces of the pair of guides are spaced apart from and opposite
20 to each other to form an open region between the opening faces of the each guide; and
the cleaned uniform air flows blown out from the each air flow opening face collide with
each other inside the open region to flow outside the open region, so as to cause
cleanliness to be higher inside the guides and inside the open region than other regions,
wherein
25 the local air cleaning apparatus includes at least one of a device for measuring
pressures inside the guides and the push hoods, a device for measuring the cleanliness
inside the guides or of the open region, and a device for measuring a gap area between
5
the opening faces of the guides; and
to ensure the cleanliness from a result of the measurement, the local air cleaning
apparatus controls such that a flow velocity of the cleaned uniform air flows blown out
from the air flow opening faces can be decelerated or accelerated.
5 [0010] A local air cleaning apparatus according to a third aspect of the present
disclosure includes:
a pair of push hoods each including an air flow opening face that blows out a
cleaned uniform air flow; and
a guide provided on a side of one of the pair of push hoods having the air flow
10 opening face and extending from the side of one of the pair thereof having the air flow
opening face to a downstream side of the uniform air flow to form an opening face at an
end portion of the downstream side,
in which the opening face of the guide is spaced apart from and opposite to the air
flow opening face of the push hood not provided with the guide to form an open region
15 between the opening face of the guide and the air flow opening face of the push hood not
provided with the guide; and
the cleaned uniform air flows blown out from the each air flow opening face
collide with each other inside the open region to flown outside the open region, so as to
cause cleanliness to be higher inside the guide and inside the open region than other
20 regions, wherein
the local air cleaning apparatus includes at least one of a device for measuring
pressures inside the guide and inside the push hoods, a device for measuring the
cleanliness inside the guide or of the open region, and a device for measuring a gap area
between the opening face of the guide and the push hood not provided with the guide;
25 and
to ensure the cleanliness from a result of the measurement, the local air cleaning
apparatus controls such that a flow velocity of the cleaned uniform air flows blown out
6
from the air flow opening faces can be decelerated or accelerated.
[0011] The guide may include a moving portion capable of changing a guide length.
In this case, a distance between the opening face of the guide and the air collision face
may be shortened by moving the moving portion to increase the guide length.
5 Advantageous Effects of Invention
[0012] The present disclosure allows power consumption to be reduced while
maintaining a clean air space at a high level of cleanliness.
Brief Description of Drawings
[0013] FIG. 1 is a diagram depicting a local air cleaning apparatus according to an
10 embodiment of the present disclosure;
FIG. 2 is a diagram depicting a structure of a push food;
FIG. 3 is a diagram depicting a structure of a guide;
FIG. 4 is a diagram depicting a structure of a controller;
FIG. 5 is a diagram depicting a relationship between wind velocity of air flow
15 blown out from an air flow opening face and gap area;
FIG. 6 is a diagram for illustrating a flow of air in a normal mode;
FIG. 7 is a diagram for illustrating a flow of air in an energy-saving mode;
FIG. 8 is a diagram depicting another example of the local air cleaning apparatus;
FIG. 9 is a diagram depicting another example of the local air cleaning apparatus;
20 FIG. 10 is a diagram depicting a local air cleaning apparatus used in an Example;
and
FIG. 11 is a diagram depicting results of energy consumption and cleanliness
inside the guide in cases where distance a (gap area) and flow velocity have been
changed.
25 Description of Embodiments
[0014] Hereinafter, a description will be given of a local air cleaning apparatus
according to the present disclosure, with reference to the drawings. FIG. 1 is a diagram
7
depicting an example of a local air cleaning apparatus according to an embodiment of the
present disclosure.
[0015] As depicted in FIG. 1, a local air cleaning apparatus 1 of the present
disclosure includes a push hood 2 arranged so as to face an air collision face W such as a
5 wall or a partition, a guide 3 provided on the push hood 2, and a controller 100 that
controls each section of the apparatus.