JP2015111031A - Clean space maintenance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clean space maintenance device which does not permit dust to enter a cleaning space and can recover dust attached to a workpiece without scattering the dust in a room.SOLUTION: A clean space maintenance device is placed on a desk, and includes a blow-out unit blowing out clean air and an intake unit recovering air having been blown out from the blow-out unit. The clean space maintenance device blows out air between both of the units in almost parallel to a top plate of the desk to maintain clean air between both of the units.

Description

The present invention relates to a clean space maintaining apparatus that creates and maintains a clean space, and further relates to a clean space maintaining apparatus that creates a space that prevents scattering of foreign objects when foreign objects attached to a workpiece during work in the clean space are removed.

Conventionally, a clean environment has been maintained with a clean environment maintenance device called a clean bench or a clean booth. Conventionally, foreign matter adhering to the work is removed by air blowing in a dust removal apparatus called a dust removal BOX or the like.

For this reason, in the conventional example, a clean environment maintaining device such as a clean bench and a foreign matter air blowing device such as a dust removal BOX cannot be used together, and both facilities are required.

In addition, since these devices are box-type independent devices and are not integrated with a work desk or the like, it is necessary to prepare another desk on which the device is placed or to prepare another storage space. .

Further, the clean space maintenance device of the conventional example is inconvenient because the side wall of the space is arranged at right angles to the worker and the depth is deep, and it hits the side wall when the work is put in and out and the work is damaged. A conventional example of a box-type clean space maintaining apparatus formed by partially cutting a side wall so as to facilitate work will be described with reference to FIG. In FIG. 13, a box-shaped clean space maintaining device (hereinafter also simply referred to as “device”) 10 is configured to have spaces 12, 14, 16 communicating with each other at the upper part, the lower part, and the rear side. The fan (blower) 18 disposed in the air blows air from the upper space 12 through the upper filter 24 to the work space in the box as indicated by an arrow, and sucks air from the work space through the lower filter 26 to the lower space 14. The air is circulated through the back space 16 to the upper space 12 again. For this reason, the air in the upper, lower, and back spaces is kept clean, and the air is kept clean even in a part of the work space.

  In the conventional apparatus 10, as shown in FIG. 13, the side walls 20 and 22 are notched in front of the worker side. For this reason, the air blown out from the upper space is blown outward through the front and side wall cutout portions. As a result, the positive pressure cannot be maintained in the space on the worker side in the box-type device, and in particular, since air is sucked in the lower part, dust (foreign matter) 50 enters the worker-side box and works. There is a risk of dust adhering to the workpiece (not shown).

As described above, the clean space maintenance device of this conventional example causes a phenomenon that the filtered clean air overflows partly out of the space, and the outside unclean air is partly drawn into the space, and the complete clean space is formed. It was difficult to maintain.

  Further, another conventional apparatus 10 will be described with reference to FIG. The conventional box-type device 10 of FIG. 14 differs from the conventional example of FIG. 13 in that notches are not provided in the side walls 20 and 22. However, even in this conventional apparatus 10, air (air) is blown out to the front side where it hits the worker, and as a result, the positive pressure cannot be maintained in the space on the worker side in the box-type apparatus, particularly in the lower part. Since the air is sucked, the dust 50 may enter the box on the operator side and the dust may adhere to the work (not shown) being worked.

Further, in the dust removal BOX of the conventional example, dust generated by an operator (not shown) is sucked into the clean space to contaminate the clean space. This conventional dust removal BOX will be described with reference to FIG. In FIG. 15, the dust removal BOX 30 is formed as a box-type device, and an air blower 32 is arranged so that air is ejected to the workpiece 40 held by the operator in order to remove dust from the workpiece 40 on the upper wall. In the lower part of the box, the removed dust was discharged to the back through the filter 36 by the fan 34. However, the dust 50 adhering to the clothes or the like of the operator (not shown) is sucked by the fan 34, so that the dust is sucked into the room and dirty the clean space in the room. In addition, since foreign air is sucked into the apparatus from the front surface where the worker is present, foreign matter is newly attached to the work 40 that has been cleanly dust-removed.

Accordingly, an object of the present invention is to arrange a blow-out unit that blows clean air on the desk and an air suction unit that collects air blown from the desk, and blows air parallel to the desk surface between both units to maintain a clean space. An object of the present invention is to provide a clean space maintaining device.

  Another object of the present invention is to remove dust (foreign matter) adhering to a workpiece by an air blow arranged in the clean space formed between the two units in the structure of the clean space maintenance device described above, and remove the removed foreign matter. An object of the present invention is to provide a clean space maintaining device that simultaneously has a dust removal function for collecting foreign matter with a suction unit and removing foreign matter adhering to a workpiece.

  The clean space maintenance device of the present invention has a blow-out unit that blows clean air on a desk and an air suction unit that collects air blown from the air, and blows a parallel space on the desk surface between both units to create a clean space. It is characterized by maintaining.

  Further, the clean space maintenance device of the present invention removes and removes dust (foreign matter) adhering to the workpiece with an air blow arranged in the clean space formed between the two units in the configuration of the clean space maintenance device described above. It is characterized by having a dust removal function for collecting foreign matter with a suction unit and removing foreign matter adhering to the workpiece.

The above-described clean space maintenance device preferably has the following configuration.
(1) The blowout unit and the suction unit are separate.
(2) The air source unit for sending / recovering air is separate from the blowing unit and the suction unit.
(3) The blow-out unit and the suction unit have an air filtering device (filter).
(4) The filters of the blowout unit and the suction unit can be attached / detached and replaced from the front (operator side).
(5) The workpiece is air blown in the clean space created between the two units to remove the adhered foreign matter, and the removed foreign matter is collected by the suction unit to create a clean space and at the same time foreign matter attached to the workpiece. Remove.
(6) A rear wall surface connecting the two units is disposed so as to protrude toward the inside of the clean space.
(7) The ceiling sheet projects as a ridge on the front (to the worker side).
(8) The ceiling is a sheet or plate that is transparent or translucent, and external illumination light can be introduced inside.
(9) An adhesive sheet is arranged on the desk, an adhesive sheet is arranged on the back wall, and an adhesive sheet is arranged on the ceiling surface.
(10) The angle θ between the blowing surface of the blowing unit and the suction surface of the suction unit is variable.
(11) When a plurality of independent clean space maintaining devices are juxtaposed, a connection clean space for connecting adjacent clean spaces is provided.

According to the present invention, the desk can be easily made into a clean space, foreign matters attached to the work can be blown in the clean space, and the blown foreign matters can be collected so as not to pollute the external environment.

The clean space maintenance device of the present invention is arranged on the work desk to create a clean space without limiting the work area on the desk. If foreign matter is found in the workpiece, the foreign matter is removed by air blowing in the clean space, and the removed foreign matter is immediately collected by the apparatus so as not to pollute the environment. When used as a dedicated dust removal device, place this device in the corner of the work area that does not interfere with work (the corner of the work desk), reach out only when dust is removed, blow out air in the device, and remove foreign matter immediately. Collect it with a so as not to pollute the environment.

A first embodiment will be described with reference to FIG. FIG. 1 is a diagram in which a clean space maintaining device (hereinafter, simply referred to as “device”) of the present invention is used as a clean environment maintaining device (clean bench or the like). In FIG. 1, the blowing unit 102 and the suction unit 104 of the apparatus 100 are placed on a work desk 112 (in this embodiment so as to form an angle), and an operator 114 is placed on the work 110 in a clean environment created by the apparatus. Work that requires cleanliness. An air source unit (fan, blower) 106 is disposed outside the work area, and the air blowing unit 102 and the suction unit 104 are connected to the air source unit 106 by a duct 108 to send air to the air blowing unit 102 of the apparatus. Used air is collected from the suction unit 104. The blowing unit 102 and the suction unit 104 preferably include a filter (not shown) for filtering foreign substances in the air. Note that a gutter 118 is disposed on tops of the blowout unit 102 and the suction unit 104.

A second embodiment will be described with reference to FIG. FIG. 2 is a diagram showing a foreign matter removing apparatus that removes foreign matter from a work by adding a dust removal function to the apparatus. In the second embodiment, the blowing unit 102 and the suction unit 104 are placed at the corners of the work desk 112 (to form an angle in this embodiment), and the air blower 116 is disposed in the work area of the blowing unit 102 and the suction unit 104. The worker 114 removes foreign matter adhering to the workpiece 110 by air blowing with an air blower 116 in a clean environment created by the apparatus. An air source unit 106 is disposed outside the work area, air is sent to the blowout unit 102 of the apparatus, and used air is collected from the suction unit 104. The blowout unit 102 and the suction unit 104 preferably include a filter for filtering foreign matter in the air. Note that a gutter 118 is disposed on tops of the blowout unit 102 and the suction unit 104.

  A third embodiment will be described with reference to FIG. The third embodiment is that the size of the blow-out surface of the blow-out unit 102 is smaller than the size of the suction surface of the suction unit 104. Is the same as the size of the surface). In this case, some winds do not blow parallel to the floor. In FIG. 3, the arrangement of the blowout unit 102 and the suction unit 104 is displayed opposite to those in FIGS. 1 and 2. Here, reference numeral 120 denotes a member for connecting the rear side of the blowout unit 102 and the suction unit 104 to each other.

A fourth embodiment will be described with reference to FIG. In the apparatus shown in FIG. 4, the outer peripheral side is larger than the inner peripheral side in the blowout air amount distribution of the blowout unit 102 and the air suction amount distribution of the suction unit 104. Here, if the air volume of the blowing unit is Vo, the inner air volume is Voi, the outer air volume is Voo, the air volume of the suction unit is Vi, the inner air volume is Vii, and the outer air volume is Vio,
It is preferred that the equations Voo> Voi and Vio> Vii hold. Thereby, the wind in the clean space can be kept uniform and stable over a wide range.

  A fifth embodiment will be described with reference to FIG. In the fifth embodiment, the blowing unit 102 and the suction unit 104 are arranged in parallel. At the top of the blowout unit 102 and the suction unit 104, a ridge 118 is provided between them, which is projected from the boundary surface connecting the blowout unit 102 and the front part of the suction unit 104 (preferably projecting in an arc shape). . A bottom plate 122 may be provided at the bottom of the blowout unit 102 and the suction unit 104, or a bottom surface of a work desk (not shown) may be used instead of the bottom plate 122 without providing any. . An air source unit (not shown) is disposed outside the work area, sends air to the blowout unit 102 of the apparatus, and collects used air from the suction unit 104. The blowing unit 102 and the suction unit 104 preferably include a filter (not shown) for filtering foreign substances in the air.

The positive pressure clean air exiting from the blow-out unit 102 advances while diffusing and is sucked into the negative pressure created by the suction unit 104 and finally sucked into the suction unit 104. At this time, a part of the air close to the front end is pushed out by the positive pressure. However, since there is a ridge 118 at the top, it is pressed from above and cannot be diffused to the top, but is pushed forward. On the other hand, the suction unit 104 creates a negative pressure and sucks it. However, the suction unit 104 is also blocked by the top ridge 118 and cannot suck air from the upper part. The clean wind that has come forward due to the positive pressure is sucked and collected by the negative pressure. Thus, the clean space can maintain cleanliness.

If this ridge 118 is not present, the positive pressure diffuses to the upper side and the front side, and cannot be recovered by the negative pressure. On the negative pressure side, the same amount of dirty air that cannot be recovered is sucked into the clean space from the outside. Thus, the internal cleanliness cannot be maintained. In this way, the meaning (role) of the spear protruding before is very large. Another feature of the present invention is that a bottom surface close to infinity is obtained by using the top surface of the work desk instead of the bottom plate.

  A sixth embodiment will be described with reference to FIG. In the sixth embodiment, the blowing unit 102 and the suction unit 104 are arranged with a certain angle θ. It is preferable to have an adhesive sheet (not shown) on the back wall. On tops of the blowout unit 102 and the suction unit 104, a ridge 118 is provided that projects from a boundary surface connecting the blowout unit 102 and the front part of the suction unit 104 (preferably projecting in an arc shape). It is preferable to have an adhesive sheet (not shown) on the lower surface of the top. Further, a bottom plate may be provided, and a desk surface may be used instead of the bottom plate. It is preferable to have an adhesive sheet on the bottom desk surface. An air source unit is arranged outside the work area, air is sent to the blowout unit 102 of the apparatus, and used air is recovered from the suction unit 104. The blowout unit 102 and the suction unit 104 preferably include a filter for filtering foreign matter in the air.

In the sixth embodiment, since the blowout unit 102 and the suction unit 104 are arranged with a certain angle θ, the frontage is open, and the cleaning area protrudes greatly toward the worker side, the worker is not allowed to work (not shown). ) Can be easily taken in and out and large workpieces can be handled in a wide clean area.

The positive pressure clean air that has flowed out of the blow-out unit 102 advances while diffusing and is sucked into the negative pressure created by the suction unit 104 and finally sucked into the suction unit. At this time, a part of the air close to the front end is pushed out by the positive pressure. However, since there is a ridge 118 at the top, it is pressed from above and cannot be diffused to the top, but is pushed forward. On the other hand, the suction unit 104 creates a negative pressure and sucks it. However, the suction unit 104 is also blocked by the top ridge 118 and cannot suck air from the upper part. The clean wind that has come forward due to the positive pressure is sucked and collected by the negative pressure. Thus, the clean space can maintain cleanliness.

If this wrinkle is not present, the positive pressure diffuses upward and forward, and cannot be recovered by negative pressure. On the negative pressure side, the same amount of dirty air that cannot be recovered is sucked into the clean space from the outside. Thus, the internal cleanliness cannot be maintained. In this way, the meaning (role) of the spear protruding before is very large. Another feature of the present invention is that a bottom surface close to infinity is obtained by using the top surface of the work desk instead of the bottom plate.

A seventh embodiment will be described with reference to FIG. Example 7 shows a form in which the clean space maintaining device is used as a device having a dust removal function. Preferably, the device is placed in the corner of work desk 112. The blowout unit 102 and the suction unit 104 are arranged with a certain angle θ (preferably 90 degrees). A trough 118 is provided on the top. The bottom uses the desk top of the work desk. An air source unit is arranged outside the work area, air is sent to the blowing unit 102 of the apparatus, and used air is collected from the suction unit 104. The blowout unit 102 and the suction unit 104 preferably include a filter for filtering foreign matter in the air. An air blower 116 is provided to air blow foreign matter on the workpiece.

In the apparatus, the blow-out unit 102 and the suction unit 104 are arranged with a certain angle θ (preferably 90 degrees), the frontage is open, and the clean area protrudes greatly toward the worker side. In addition to easy loading and unloading, it can handle large workpieces in a wide clean area.

The positive pressure clean air that has flowed out of the blow-out unit 102 advances while diffusing and is sucked into the negative pressure created by the suction unit 104 and finally sucked into the suction unit. At this time, a part of the air close to the front end is pushed out by the positive pressure. However, since there is a ridge 118 at the top, it is pressed from above and cannot be diffused to the top, but is pushed forward. On the other hand, the suction unit 104 creates a negative pressure and sucks it. However, the suction unit 104 is also blocked by the ridge at the top and cannot suck air from the upper part, so it sucks from the front end. The clean wind that has come forward due to the positive pressure is sucked and collected by the negative pressure. Thus, the clean space can maintain cleanliness.

If this wrinkle is not present, the positive pressure diffuses upward and forward, and cannot be recovered by negative pressure. On the negative pressure side, the same amount of dirty air that cannot be recovered is sucked into the clean space from the outside. Thus, the internal cleanliness cannot be maintained. In this way, the meaning (role) of the spear protruding before is very large. Another feature of the present invention is that a bottom surface close to infinity is obtained by using the top surface of the work desk instead of the bottom plate. The same amount of clean air introduced by the air blower overflows outside the apparatus, but since it is clean air, it does not pollute the external environment and is not a problem.

A three-sided view of the apparatus of Example 7 described above is shown in FIG. 8a is a plan view (cross-sectional view), FIG. 8b is a right side view, FIG. 8c is a front view, and FIG. 8d is a right oblique side view. When the dust removal function is provided, an air blower 116 is disposed in the work area. And the adhesive sheet 130 is preferably provided in the top part, the wall surface behind, and the bottom part. The blowout unit 102 and the suction unit 104 are connected to an air source unit (fan) 106 by a duct 108.

Example 8 will be described with reference to FIG. FIG. 9 shows the shape of the bag of the device. Although the shape of the ridge is projected forward, it is preferable that the projection rate on the suction unit 104 side is larger than that on the blowout unit 102 side. This is expressed as follows:

Here, the overhang rate is defined by the following equation.
Depth of blowout unit is Wo, depth of ridge is Wo + a
The depth of the inhalation unit is Wi, the depth of the heel is Wi + b
Then, the overhang rate Ao = (Wo + a) / Wo on the blowing unit side
The overhang ratio Ai = (Wi + b) / Wi
It becomes.
At this time,
Ao ≦ Ai
Is preferred.

  A ninth embodiment will be described with reference to FIGS. FIG. 10 is a perspective view showing the apparatus of Example 9, FIG. 11a is a plan view for explaining a case where no fence is used, and FIG. 11b is a plan view when a fence is used. The fence 104a is attached to the front side of the suction unit so as to project to the worker side. When there is no fence 104a, outside air is sucked into the suction unit 104, but when there is the fence 104a, outside air is disturbed by the fence and is not sucked into the suction unit. For this reason, dust from the outside does not enter and the cleanliness can be kept high.

Example 10 will be described with reference to FIG. 12 shows a clean space maintaining device and a dust removing device, FIG. 12a is a perspective view, FIG. 12b is a side view (cross-sectional view), and FIG. 12c is a front view. This clean space maintenance device is a box-type device (for example, a clean bench) having a blow-out unit 102 at the top, a suction unit 104 at the bottom, and a clean space in the middle between the top and bottom. The front end portions of the left and right side walls 132 are pushed forward, and all the air blown out from the blowout unit 102 is collected by the suction unit 104. Clean air can be maintained because dirty air is not sucked in from the outside. It is preferable that the shape of the left and right side walls protrudes forward on the suction unit 104 side.

This clean space maintenance device is a device that creates a clean space if equipped with an air blower and also functions as a dust removal device that removes foreign matter adhering to the workpiece.

  Example 11 will be described with reference to FIG. 17, but will be described first as a comparative example with reference to FIG. In an actual work site, a plurality of clean space maintenance devices 100 and 100 (in this description, two examples) may be juxtaposed to perform a flow work. In that case, when the inside of a process is made into a clean space and workpieces are delivered between processes, the delivery space needs to be made into a clean space. FIG. 16 simply shows a state in which two clean space maintaining devices are arranged in a pre-process and a post-process. The amount of air flowing through the air source unit (wind power engine) 106, the air outlet 102, and the suction unit 104 is all equal to Vo. When the work of the previous process is over and the workpiece is passed to the subsequent process, it passes through the unclean space between the previous and subsequent processes. At this time, foreign matter adheres to the workpiece. In addition, the code | symbol is attached | subjected only to the left figure, and is abbreviate | omitting in the right figure. Reference numerals 110 and 114 denote a workpiece and an operator, respectively.

  Example 11 shown in FIG. 17 shows a configuration that eliminates the above-described drawbacks of the comparative example of FIG. For example, a connecting wall 144 is provided between the two clean air maintaining devices 100, 100, an object sensor (preferably sensing a workpiece immediately before the transfer area) (not shown) is provided, and the suction unit 104 or An external air intake lid 140 is provided in the duct 108 on the intake unit 104 side of the air source unit 106 or on the intake side of the air source unit 106 (in this embodiment, the external air intake lid is provided in the intake unit 104). . When the object sensor senses a workpiece, the outside air taking-in lid 140 is opened, and outside air is taken into the suction unit 104. When the amount of outside air taken in at this time is Ve, the amount of air flowing through the air source unit (wind power engine) is (Vo + Ve), and the amount of air flowing through the clean space is also (Vo + Ve). Since the suction unit 104 sucks only Vo, eventually, Ve overflows and flows between the front and rear clean space maintaining devices. Thus, a clean space (extended clean zone) 142 between the clean space maintaining devices is created. Since the workpiece is passed through the clean space 142 to a subsequent process, the adhesion of foreign matter to the workpiece is avoided.

It is a top view which shows the apparatus of Example 1 of this invention. It is a top view which shows the apparatus of Example 2 of this invention. It is a perspective view which shows the apparatus of Example 3 of this invention. It is a top view which shows the apparatus of Example 4 of this invention. It is a perspective view which shows the apparatus of Example 5 of this invention. It is a perspective view which shows the apparatus of Example 6 of this invention. It is a perspective view which shows the apparatus of Example 7 of this invention. It is a figure which shows the apparatus of Example 7 of this invention with a 3rd page figure. It is a top view which shows the apparatus of Example 8 of this invention. It is a perspective view which shows the apparatus of Example 9 of this invention. It is a top view for demonstrating Example 9 of this invention. It is the perspective view, side view, and front view which show the apparatus of Example 10 of this invention. It is the perspective view, side view, and front view which show one of the prior art examples. It is the perspective view, side view, and front view which show another one of a prior art example. It is the perspective view, side view, and front view which show another one of a prior art example. It is a top view which shows the structure of the comparison for demonstrating the apparatus of Example 11 of this invention. It is a top view which shows the apparatus of Example 11 of this invention.

100 Clean Space Maintenance Device 102 Blowout Unit 104 Suction Unit 106 Fan (Blower)
108 Duct 110 Workpiece 116 Air blower 140 External air intake lid 142 Extended clean area 144 Connection wall

Claims (23)

A blow-out unit that is arranged on the desk and blows out clean air; and a suction unit that is placed on the desk and collects air blown from the blow-out unit. A clean space maintaining device characterized by maintaining clean air between both units.   2. The clean space maintaining apparatus according to claim 1, wherein the blowout unit and the suction unit are separate. 3. The clean space maintaining apparatus according to claim 1, wherein an air source unit for sending / recovering air is separated from the blowout unit and the suction unit. 3. The clean space maintaining apparatus according to claim 1, wherein the blowout unit and the suction unit have a filter.   The clean space maintenance device according to claim 1 or 2, wherein the blow-out surface of the blow-out unit and the suction surface of the suction unit are different in size. 3. The clean space maintaining device according to claim 1, wherein the outer peripheral side is larger than the inner peripheral side in the blowout air amount distribution of the blowout unit and the air suction amount distribution of the suction unit. 5. The clean space maintaining apparatus according to claim 4, wherein the filter of the blowout unit and the suction unit can be attached / detached and replaced from the front surface (operator side). 2. A clean space maintaining apparatus according to claim 1, wherein an air blower is provided between the blow-out unit and the suction unit, and a dust removing function for removing foreign matter adhering to the workpiece by the air blower is provided in combination with the clean maintenance. Space maintenance device. The clean space maintenance device according to claim 1 or 2, wherein a rear wall surface connecting the two units is disposed so as to protrude toward the inside of the clean space.   3. The clean space maintaining apparatus according to claim 1, further comprising a fence projecting on the front side of the suction unit. The clean space maintenance device according to claim 1 or 2, wherein the top portion projects as a ridge on the front surface (to the worker side). 12. The clean space maintaining apparatus according to claim 11, wherein the overhang rate of the top ridge is larger on the suction unit side than on the blowing unit side. 3. The clean space maintaining apparatus according to claim 1, wherein the top portion is a sheet or plate that is transparent or translucent and introduces external illumination light into the interior. The clean space maintenance apparatus according to claim 1, wherein an adhesive sheet is disposed on the desk. The clean space maintenance apparatus according to claim 1, wherein an adhesive sheet is disposed on the back wall surface. The clean space maintenance apparatus according to claim 1, wherein an adhesive sheet is disposed on the top surface. 3. The clean space maintaining apparatus according to claim 1, wherein an angle θ between the blow-out surface of the blow-out unit and the suction surface of the suction unit is variable. A clean space characterized by having a blow-out unit at the top, a suction unit at the bottom, a clean space at the middle between the top and bottom, and the front ends of the left and right side walls projecting forward and downward. Maintenance device. 19. The clean space maintaining apparatus according to claim 18, further comprising an air blower between the blow-out unit and the suction unit, and having a dust removing function for removing foreign matter attached to the workpiece by the air blower.   2. A clean space maintaining device in which a plurality of clean space maintaining devices according to claim 1 are juxtaposed, comprising a clean space for connection for connecting clean spaces between adjacent clean space maintaining devices. .   21. The clean space maintaining apparatus according to claim 20, further comprising a connecting wall between adjacent clean space maintaining apparatuses.   21. A clean air maintaining device according to claim 20, wherein a cover for taking in outside air is provided on a duct on the suction unit side of the suction unit or the air source unit or on the suction side of the air source unit to take in outside air. apparatus.   21. The clean space maintaining apparatus according to claim 20, wherein an object sensor is provided, and when the object sensor detects a workpiece, the outside air intake lid is opened to take in the outside air.

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