Emergency ventilation device

Abstract

To provide an emergency ventilation device that can suppress a decrease in the removal performance of a filter and can prolong the life of the filter. 【Solution means】An airtight chamber 2 having airtightness, a suction means 3 that sucks outside air from an inlet 22 provided on one end side of the airtight chamber 2 and discharges the outside air from a suction port 23 provided on the other end side of the airtight chamber 2, and an inner peripheral surface 41 formed in an arc shape along the inflow direction of the inlet 22 to generate a vortex in the outside air, a vortex generation part 4, and a filter group 5 provided on the downstream side of the vortex generation part 4 to allow the vortex-shaped outside air to pass through and remove dust and harmful components.

Description

Technical Field

[0001] The present invention relates to an emergency ventilation device for ventilating a shelter space such as an underground shelter in an emergency such as a special disaster.

Background Art

[0002] Conventionally, a technique for ventilating a shelter used as an evacuation destination during a disaster or the like is known. For example, Japanese Patent Application Laid-Open No. 2014-167379 proposes a shelter ventilation system capable of minimizing secondary exposure and secondary contamination in a shelter (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In conventional ventilation devices including the shelter ventilation system described in Patent Document 1, when a filter for removing dust or the like becomes clogged and the removal performance deteriorates, it is necessary to replace it with a new filter. However, since the used filter with deteriorated removal performance may be contaminated by harmful components such as radioactive substances and biological weapons, there is a desire to use the filter for as long as possible without replacement.

[0005] The present invention has been made to solve such problems, and an object thereof is to provide an emergency ventilation device that can suppress a decrease in the removal performance of a filter and can make the filter last longer.

Means for Solving the Problems

[0006] The emergency ventilation device according to the present invention is an emergency ventilation device for ventilating the evacuation space in an emergency in order to suppress a decrease in the removal performance of the filter and to prolong the life of the filter. The emergency ventilation device includes an airtight chamber having airtightness, a suction means for sucking outside air from an inlet provided on one end side of the airtight chamber and discharging the outside air from a suction port provided on the other end side of the airtight chamber, a vortex generating portion provided on one end side in the airtight chamber for generating a vortex in the outside air by an inner peripheral surface formed in an arc shape along the inflow direction of the inlet, and a filter group provided on the downstream side of the vortex generating portion for removing dust and harmful components by passing the vortex-shaped outside air.

[0007] Also, as an aspect of the present invention, in order to solve the problem of reliably removing dust and harmful components contained in outside air, the filter group may include a pre-filter for removing relatively large dust contained in the outside air, a HEPA filter for removing relatively small dust contained in the outside air, and a chemical filter box for removing harmful components contained in the outside air, which may be arranged in this order along the suction direction by the suction means.

[0008] Furthermore, as an aspect of the present invention, in order to solve the problem of easily and quickly setting the chemical filter box without damaging the airtight packing, when the suction direction is from bottom to top, a pair of slide guides provided on both side surfaces of the chemical filter box, a pair of guide receivers provided on the inner surface of the airtight chamber for sliding each of the slide guides, and an airtight packing provided on the upper end surface of the HEPA filter for maintaining airtightness between the lower end surface of the chemical filter box. The tip of the slide guide is provided with a sliding convex portion that slides on the sliding surface of the guide receiver while maintaining a height position where the lower end surface of the chemical filter box does not contact the airtight packing, and the tip of the guide receiver may be provided with a fitting recess for lowering the lower end surface of the chemical filter box to a height position where it is in close contact with the airtight packing when the sliding convex portion is fitted.

[0009] Also, as one aspect of the present invention, in order to solve the problem of positioning the chemical filter box at the correct set position and preventing displacement, a stopper convex portion for preventing sliding with the guide receiver is provided at the rear end portion of the slide guide, and a stopper concave portion that can be fitted with the stopper convex portion may be provided at the rear end portion of the guide receiver.

[0010] Furthermore, as one aspect of the present invention, in order to solve the problem of efficiently collecting dust even with a drive motor having a small output, a flow velocity adjustment plate that is swingably provided in the vicinity of the inlet and can increase or decrease the opening area of the inlet may be provided.

[0011] Also, as one aspect of the present invention, in order to solve the problem of improving the removal performance of fine dust by generating static electricity in the vortex generation portion and the flow velocity adjustment plate, at least the surface of the vortex generation portion and the flow velocity adjustment plate that contacts the outside air may be made of a resin material.

[0012] Furthermore, as one aspect of the present invention, in order to solve the problem of preventing the normal ventilation and the emergency ventilation from being erroneously executed, the pipe connecting the suction port and the suction means may be communicated with a normal ventilation port used for normal ventilation.

Effect of the Invention

[0013] According to the present invention, it is possible to suppress a decrease in the removal performance of the filter and make the filter last longer.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0015] Hereinafter, an embodiment of the emergency ventilation device according to the present invention will be described with reference to the drawings.

[0016] The emergency ventilation device 1 of the present embodiment is for ventilating the evacuation space in an emergency. As shown in FIGS. 1 to 5, mainly, an airtight chamber 2 having airtightness, a suction means 3 provided above the airtight chamber 2, a vortex generation part 4 provided at the bottom inside the airtight chamber 2, and a filter group 5 provided on the downstream side of the vortex generation part 4 are housed inside the housing 11. Hereinafter, each configuration will be described.

[0017] In the present invention, the emergency is assumed to be a disaster caused by chemical substances (Chemical), biological substances (Biological), radiological substances (Radiological), nuclear substances (Nuclear), and explosives (Explosive), which is so-called CBRNE (Severn) disaster. However, it is not limited to these, and includes various disasters such as earthquakes, fires, and typhoons.

[0018] In the present invention, the evacuation space includes not only shelters such as underground shelters and nuclear shelters, but also all evacuation facilities used in emergencies, such as gymnasiums and community centers.

[0019] The airtight chamber 2 is formed in a box shape with airtightness. As shown in FIG. 4, its front surface is configured to be openable by the inner door 21. Further, as shown in FIG. 1, the airtight chamber 2 is provided with an inlet 22 on its lower end side and a suction port 23 on its upper end side. In the present embodiment, the pipe 22a provided at the inlet 22 protrudes outside the housing 11 and takes in outside air from the emergency ventilation port 24. Further, as shown in FIG. 2, the pipe 23a provided at the suction port 23 is connected to the suction means 3 and communicates with the normal ventilation port 25 used for normal ventilation.

[0020] In the present embodiment, since the suction direction by the suction means 3 is from the lower side to the upper side, the inlet 22 is provided on the lower end side of the airtight chamber 2 and the suction port 23 is provided on the upper end side. However, the present invention is not limited to this configuration. Depending on the suction direction, the inlet 22 may be provided on one end side of the airtight chamber 2 and the suction port 23 may be provided on the other end side of the airtight chamber 2. Further, in each figure, for the purpose of easily understanding the internal structure of the emergency ventilation device 1, the illustration of the outer door 12 on the front surface of the housing 11, the inner door 21 on the front surface of the airtight chamber 2, and the pipes provided at the suction port 23 are appropriately omitted.

[0021] The suction means 3 sucks outside air into the airtight chamber 2. In the present embodiment, the suction means 3 is composed of a turbo blower 31 connected to the suction port 23 and a drive motor 32 for driving the turbo blower 31. With this configuration, when the drive motor 32 drives the turbo blower 31, the outside air in the airtight chamber 2 is sucked from the suction port 23 to create a negative pressure. Therefore, the outside air is sucked in from the emergency ventilation port 24 through the inlet 22, and after the outside air is discharged from the suction port 23, it is supplied into the evacuation space through the pipe 23a and the discharge port 31a of the turbo blower 31.

[0022] In addition, in the present embodiment, the drive motor 32 is integrated with a speed increaser, and the rotation speed of the drive motor 32 can be appropriately amplified. Further, a manual handle 33 is provided on the drive motor 32, and it can be manually driven even during a power outage or the like.

[0023] The vortex generation part 4 generates a vortex in the outside air flowing into the airtight chamber 2. In the present embodiment, as shown in FIGS. 4 and 5, the vortex generation part 4 is provided at the bottom which is one end side in the airtight chamber 2, and has an inner peripheral surface 41 formed in an arc shape along the inflow direction of the inflow port 22. With this configuration, as shown in FIG. 6, the outside air flowing into the airtight chamber 2 swirls along the inner peripheral surface 41, so that the dust contained in the outside air is separated and collected by centrifugal force.

[0024] Also, in the present embodiment, as shown in FIG. 4, a flow velocity adjustment plate 42 capable of increasing or decreasing the opening area of the inflow port 22 is provided swingably in the vicinity of the inflow port 22. By swinging the flow velocity adjustment plate 42 and fixing it at an arbitrary angle, the opening area of the inflow port 22 increases or decreases, and thus the flow velocity increases or decreases according to the opening area. Here, from the results of Example 1 described later, the dust collection rate in the vortex generation part 4 improves as the flow velocity increases, and the particle diameter of the dust collected by the vortex generation part 4 becomes smaller as the flow velocity increases. Therefore, by adjusting the flow velocity with the flow velocity adjustment plate 42, it is possible to adjust the collection rate and the particle diameter of the dust in the vortex generation part 4.

[0025] Furthermore, in the present embodiment, at least the surface in contact with the outside air of the vortex generation part 4 and the flow velocity adjustment plate 42 is constituted by a resin material by applying resin coating, powder baking coating of resin paint, or the like. As a result, the dust contained in the outside air generates static electricity due to contact and friction with the resin surface, so that even fine dust is adsorbed and collected by the vortex generation part 4 and the flow velocity adjustment plate 42.

[0026] The filter group 5 removes dust and harmful components contained in the outside air. In the present embodiment, as shown in FIGS. 1 and 5, the filter group 5 is provided above the vortex generating portion 4, and includes a pre-filter 51 that removes relatively large dust contained in the outside air, a HEPA filter 52 that removes relatively small dust contained in the outside air, and a chemical filter box 53 that removes harmful components contained in the outside air. They are arranged in this order from bottom to top.

[0027] As the pre-filter 51, a coarse dust filter made of non-woven fabric or the like can be used. Also, as defined by the JIS standard (Japanese Industrial Standard), a HEPA (High Efficiency Particulate Air) filter has a particle collection rate of 99.97% or more for particles with a particle size of 0.3 μm at the rated air volume and an initial pressure loss of 245 Pa or less. It is an air filter with such performance.

[0028] The chemical filter box 53 is box-shaped and contains a plurality of activated carbon filters impregnated with metal components (such as zinc, copper, tin, etc.) that detoxify harmful components. In the present invention, harmful components include all components harmful to the human body, such as toxic chemical substances, biological weapons such as bacteria and viruses, and radioactive substances.

[0029] The configuration of the filter group 5 is not limited to the above three types of filters, and filters capable of removing dust and harmful components may be appropriately employed. Also, the direction in which the filter group 5 is arranged in sequence is not limited to from bottom to top, and it may be arranged along the suction direction by the suction means 3. Furthermore, the arrangement position of the filter group 5 may be provided on the downstream side of the vortex generating portion 4 in the suction direction. Thereby, the outside air made vortex-shaped by the vortex generating portion 4 is passed through to remove dust and harmful components.

[0030] Also, in the present embodiment, as shown in FIG. 7, airtight packings 54 for maintaining airtightness are provided between the upper end surface of the pre-filter 51 and the lower end surface of the HEPA filter 52, and between the upper end surface of the HEPA filter 52 and the lower end surface of the chemical filter box 53. This prevents dust and harmful components contained in the outside air from leaking, and can be removed by the filter group 5.

[0031] In addition, in the present embodiment, as described above, the suction direction by the suction means 3 is from bottom to top. Therefore, if an attempt is made to set the chemical filter box 53, which is the uppermost stage, into the narrow airtight chamber 2 only by hand, it is difficult to accurately install it at the desired position because it is quite heavy. On the other hand, if the chemical filter box 53 is dragged on the airtight packing 54 provided on the upper surface of the HEPA filter 52, there is a risk of damaging the airtight packing 54.

[0032] Therefore, in the present embodiment, as a configuration for easily and quickly setting the chemical filter box 53 without damaging the airtight packing 54, as shown in FIGS. 1, 3, and 8, a pair of slide guides 55, 55 are provided on both side surfaces of the chemical filter box 53, and a pair of guide receivers 56, 56 for sliding each of the slide guides 55 are provided on the inner side surface of the airtight chamber 2.

[0033] At the tip of the slide guide 55, as shown in FIG. 8, a sliding convex portion 55a is provided that slides on the sliding surface of the guide receiver 56 while maintaining a height position where the lower end surface of the chemical filter box 53 does not contact the airtight packing 54. On the other hand, at the tip of the guide receiver 56, as shown in FIG. 8, a fitting concave portion 56a is provided that lowers the lower end surface of the chemical filter box 53 to a height position where it is in close contact with the airtight packing 54 when the sliding convex portion 55a is fitted. Further, the sliding convex portion 55a and the fitting concave portion 56a are inclined downward toward the back side, so that the chemical filter box 53 can be smoothly lowered to the set position.

[0034] Also, in this embodiment, as a configuration for positioning the chemical filter box 53 at the correct set position and preventing displacement, a stopper convex portion 55b for preventing sliding with the guide receiver 56 is provided at the rear end portion of the slide guide 55, as shown in FIG. 8. On the other hand, a stopper concave portion 56b that can be fitted with the stopper convex portion 55b is provided at the rear end portion of the guide receiver 56 in a state where the chemical filter box 53 is set at the correct set position.

[0035] Next, the operation of the emergency ventilation device 1 of this embodiment will be described.

[0036] When using the emergency ventilation device 1 of this embodiment, first, the flow rate adjustment plate 42 is swung as necessary and fixed at a desired angle. As a result, as the opening area of the inlet 22 is narrowed, the flow rate of the outside air increases, so the centrifugal force acting on the dust in the outside air increases. Also, as the centrifugal force increases, even fine dust can be collected, and the collection rate in the vortex generation part 4 improves. For this reason, dust can be collected sufficiently and efficiently even by a drive motor 32 with a small output.

[0037] Next, the filter group 5 is set in the airtight chamber 2. Specifically, as shown in FIGS. 1, 3, and 5, the pre-filter 51, the airtight packing 54, the HEPA filter 52, and the airtight packing 54 are stacked in this order above the downstream side of the vortex generation part 4, and then the chemical filter box 53 is placed on top of them.

[0038] At this time, in this embodiment, as shown in FIG. 8(a), after placing the sliding convex portions 55a of the slide guides 55 provided on both side surfaces of the chemical filter box 53 on the sliding surfaces of the guide receivers 56, by simply pushing in the chemical filter box 53, it slides backward while maintaining a height position where its lower end surface does not contact the airtight packing 54. For this reason, the heavy chemical filter box 53 can be easily and quickly moved to the set position without damaging the airtight packing 54.

[0039] After that, as shown in Fig. 8(b), when the inclined surface of the sliding convex portion 55a slides down along the inclined surface of the fitting concave portion 56a, as shown in Fig. 8(c), the sliding convex portion 55a is fitted into the fitting concave portion 56a, so that the lower end surface of the chemical filter box 53 descends to a height position where it is in close contact with the airtight packing 54. As a result, the chemical filter box 53 is accurately set in the set position.

[0040] Also, in this embodiment, when the chemical filter box 53 slides to the set position, as shown in Fig. 8(c), the stopper convex portion 55b of the slide guide 55 fits into the stopper concave portion 56b of the guide receiver 56. For this reason, the chemical filter box 53 is accurately positioned in the set position and does not deviate from the set position even when receiving an external force.

[0041] Subsequently, the turbo blower 31 is driven by the drive motor 32 that constitutes the suction means 3. As a result, the turbo blower 31 sucks the outside air in the airtight chamber 2 from the suction port 23 through the pipe 23a to create a negative pressure, so that the outside air is sucked in from the emergency ventilation port 24 through the inflow port 22. Also, by making the entire inflow path into the airtight chamber 2 negative pressure, it is possible to prevent the outside air before filtration from diffusing into the evacuation space.

[0042] Furthermore, in this embodiment, since an ordinary ventilation port 25 is provided separately from the emergency ventilation port 24, by making it in a visually distinguishable state, such as covering the unused one with a cap, it is possible to prevent the normal ventilation and the emergency ventilation from being erroneously executed. When performing normal ventilation, the turbo blower 31 is driven with the emergency ventilation port 24 capped. As a result, the outside air sucked from the ordinary ventilation port 25 is supplied from the discharge port 31a of the turbo blower 31 into the evacuation space for ventilation.

[0043] When outside air is sucked into the airtight chamber 2, as shown in Fig. 6, the inner peripheral surface 41 of the vortex generating portion 4 causes the outside air to swirl at high speed to generate a vortex. As a result, dust contained in the outside air is separated by centrifugal force and falls along the inner peripheral surface 41 to be collected in advance. For this reason, the amount of dust filtered by the filter group 5 on the downstream side is reduced, and it is less likely to become clogged. Therefore, it is suitable when a large amount of dust is generated or when ventilating a large-scale evacuation space.

[0044] In addition, since the vortex generating portion 4 generates a vortex in the outside air, the outside air passes through the pre-filter 51 on the downstream side thereof over the entire surface. As a result, in the pre-filter 51, the dust contained in the outside air is dispersed without being concentrated in one place (near the center) and is evenly filtered, so that a decrease in the removal performance of the filter is suppressed and the filter has a long life.

[0045] Furthermore, in the present embodiment, since the vortex generating portion 4 and the flow velocity adjusting plate 42 are in contact with the outside air on the surface formed of a resin material, static electricity is generated by contact and friction with the dust contained in the outside air. As a result, fine dust is also adsorbed and collected on the inner peripheral surface 41 and the flow velocity adjusting plate 42 by the action of the static electricity, so that the removal performance is improved.

[0046] Thereafter, in the filter group 5 on the downstream side of the vortex generating portion 4, first, the pre-filter 51 removes relatively large dust contained in the outside air. Next, the HEPA filter 52 removes relatively small dust contained in the outside air. Further, the chemical filter box 53 removes harmful components contained in the outside air. Due to the characteristic functions of these respective filters, dust and harmful components contained in the outside air are appropriately removed, so that the purified and detoxified outside air is supplied into the evacuation space for ventilation.

[0047] In addition, in this embodiment, since the chemical filter box 53 using an activated carbon filter is employed, the micropores of the activated carbon adsorb the odor molecules contained in the outside air. Therefore, not only can the outside air be purified and detoxified, but it also has the effect of deodorizing. Thus, it is possible to deodorize the evacuation space where the duration of the evacuation life is extended or the malodor has increased due to a large number of evacuees.

[0048] According to the emergency ventilation device 1 of this embodiment as described above, the following effects can be obtained. 1. It is possible to suppress the decrease in the removal performance of the filter and make the filter last longer. 2. It is possible to surely remove the dust and harmful components contained in the outside air. 3. The chemical filter box 53 can be easily and quickly set without damaging the airtight packing 54. 4. The chemical filter box 53 can be positioned at the correct setting position to prevent displacement. 5. Even a drive motor 32 with a small output can collect dust sufficiently and efficiently. 6. It is possible to generate static electricity in the vortex generating part 4 and the flow velocity adjusting plate 42 to improve the removal performance of fine dust. 7. It is possible to prevent the incorrect execution of normal ventilation and emergency ventilation.

[0049] Next, a specific example of the emergency ventilation device 1 according to the present invention will be described. Note that the technical scope of the present invention is not limited to the features shown by the following examples.

Example

[0050] In this Example 1, in the emergency ventilation device 1 of this embodiment, an experiment was conducted to confirm the relationship between the flow velocity of the outside air flowing in from the inlet 22, the collection rate of dust in the vortex generating part 4, and the particle diameter of the dust collected in the vortex generating part 4.

[0051] Specifically, in the emergency ventilation device 1 with the inner peripheral surface 41 having a diameter of 430 mm and the inlet 22 having a diameter of 90 mm, the opening area of the inlet 22 is not adjusted (0.00636 m 2 ), 1 / 2 (0.00318 m 2 ), 1 / 3 (0.00212 m 2 ), 1 / 4 (0.00159 m 2 ) are set to four types, and outside air is allowed to flow in at 150 m 3 / h by the suction means 4. Then, the results of measuring the inflow velocity of the outside air, the particle diameter of the dust collected in the vortex generation part 4, and the collection rate at each opening area are shown in FIG. 9.

[0052] As shown in FIG. 9, when the opening area of the inlet 22 is not adjusted (0.00636 m 2 ), the flow velocity is 6.55 m / s, the particle diameter of the dust collected in the vortex generation part 4 is 32.7 μm, and the dust collection rate in the vortex generation part 4 is 70 - 90%. On the other hand, when the opening area is narrowed to 1 / 2 (0.00318 m 2 ), the flow velocity rises to 13.1 m / s, the particle diameter of the dust collected in the vortex generation part 4 is reduced to 23.1 μm, and the dust collection rate in the vortex generation part 4 is improved to 80 - 95%.

[0053] Also, when the opening area is narrowed to 1 / 3 (0.00318 m 2 ), the flow velocity rises to 19.68 m / s, the particle diameter of the dust collected in the vortex generation part 4 is reduced to 18.9 μm, and the dust collection rate in the vortex generation part 4 is improved to 90% or more. Further, when the opening area is narrowed to 1 / 4 (0.00159 m 2 ), the flow velocity becomes 26.23 m / s, the particle diameter of the dust collected in the vortex generation part 4 is reduced to 16.3 μm, and the dust collection rate in the vortex generation part 4 is improved to 95% or more.

[0054] According to the first embodiment as described above, it is shown that the dust collection rate in the vortex generation part 4 improves as the flow velocity of the outside air flowing in from the inlet 22 increases, and the particle diameter of the dust collected in the vortex generation part 4 becomes smaller as the flow velocity of the outside air flowing in from the inlet 22 increases.

[0055] Note that the emergency ventilation device 1 according to the present invention is not limited to the above-described embodiments and can be appropriately changed.

[0056] For example, in the above-described embodiment, when performing emergency ventilation, only the emergency ventilation port 24 is opened, and when performing normal ventilation, only the normal ventilation port 25 is opened. However, the present invention is not limited to this configuration. For example, when performing normal ventilation, both the emergency ventilation port 24 and the normal ventilation port 25 may be opened to deodorize the evacuation space while ventilating.

Explanation of Reference Numerals

[0057] 1 Emergency ventilation device 11 Housing 12 Outer door 2 Airtight chamber 21 Inner door 22 Inlet 22a Pipe 23 Suction port 23a Pipe 24 Emergency ventilation port 25 Normal ventilation port 3 Suction means 31 Turbo blower 31a Discharge port 32 Drive motor 33 Manual handle 4 Vortex generation section 41 Inner peripheral surface 42 Flow velocity adjustment plate 5 Filter group 51 Prefilter 52 HEPA filter 53 Chemical filter box 54 Airtight packing 55 Slide guide 55a Sliding convex portion 55b Stopper convex portion 56 Guide receiver 56a Insertion recess 56b Stopper recess

Claims

1. An emergency ventilation device for ventilating an evacuation space in an emergency, comprising: an airtight chamber having airtightness; suction means for sucking outside air from an inlet provided at one end side of the airtight chamber and discharging the outside air from a suction port provided at the other end side of the airtight chamber; a vortex generation part provided at one end side in the airtight chamber and generating a vortex in the outside air by an inner peripheral surface formed in an arc shape along the inflow direction of the inlet; a filter group provided on the downstream side of the vortex generation part and removing dust and harmful components by allowing the vortex-shaped outside air to pass therethrough; and having the filter group includes a pre-filter for removing relatively large dust contained in the outside air; a HEPA filter for removing relatively small dust contained in the outside air; a chemical filter box for removing harmful components contained in the outside air, which are arranged in this order along the suction direction by the suction means, when the suction direction is from bottom to top, a pair of slide guides provided on both side surfaces of the chemical filter box; a pair of guide receivers provided on the inner side surface of the airtight chamber and sliding each of the slide guides; an airtight packing provided on the upper end surface of the HEPA filter and maintaining airtightness between the lower end surface of the chemical filter box; and having a sliding convex portion is provided at the tip of the slide guide, which slides on the sliding surface of the guide receiver while maintaining a height position where the lower end surface of the chemical filter box does not contact the airtight packing, and an insertion concave portion is provided at the tip of the guide receiver, which lowers the lower end surface of the chemical filter box to a height position where it is in close contact with the airtight packing when the sliding convex portion is fitted therein. Emergency ventilation device.

2. A stopper convex portion for preventing sliding with the guide receiver is provided at the rear end portion of the slide guide, and a stopper concave portion that can be fitted with the stopper convex portion is provided at the rear end portion of the guide receiver. The emergency ventilation device according to Claim 1.

3. The emergency ventilation device according to Claim 1 or Claim 2, further comprising a flow velocity adjustment plate that is swingably provided near the inlet and can increase or decrease the opening area of the inlet.

4. The emergency ventilation device according to claim 3, wherein at least the surfaces of the eddy current generating part and the flow velocity adjusting plate that come into contact with the outside air are made of a resin material.

5. The emergency ventilation device according to claim 1 or claim 2, wherein the pipe connecting the suction port and the suction means communicates with a normal ventilation port used for normal ventilation.

Images