JP2010207394A - Air flow measuring device for smokeproof apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air flow measuring device for smokeproof apparatus which is capable of easily and appropriately measuring the air volume of the smokeproof apparatus having a plurality of smoke vents and air supply ports. <P>SOLUTION: The air flow measuring device 100 measures the air volume of the smokeproof apparatus formed of at least one of a smoke discharge mechanism having a smoke discharging fan and a plurality of smoke vents or a pressurized air supply mechanism having a pressurized air supply fan and a plurality of air supply ports. The air flow measuring device includes: a main duct 10; a bypass duct 12 disposed parallel to the main duct 10; air flow measuring means 16a and 16b for measuring the air volumes Q<SB>1</SB>and Q<SB>2</SB>by the fans passing through the main duct 10 and the bypass duct 12 respectively; and ventilation resistance varying means 14 for varying the ventilation resistance in the bypass duct 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air volume measuring device for smoke proof equipment, and more particularly to an air volume measuring device for smoke proof equipment suitable for air volume inspection during maintenance.

  In recent years, the decline in safety morals has been seen as a problem, and social awareness of safety is increasing. The safety at the time of fire is no exception, and legal regulations at the maintenance stage of fire countermeasures provided in buildings and smoke exhausting equipment provided in civil engineering structures such as tunnels (for example, see Patent Document 1) have been strengthened. Yes. With regard to smoke prevention equipment such as smoke exhaustion equipment and pressurized air supply equipment, for example, in buildings such as commercial facilities, smoke protection equipment is actually operated at the service stage and its performance has been confirmed. In this case, basically, it is necessary to measure the wind speed at all the smoke exhaust ports and the air supply ports provided in the smoke proofing equipment to check whether or not there is a predetermined air volume.

  FIG. 5 is a schematic system diagram illustrating an example of a smoke exhausting facility as a smokeproof facility provided in a building. As shown in FIG. 5, the smoke exhausting equipment includes a vertical duct 2 extending from the smoke exhausting fan 1 and a horizontal pulling duct 3 that is horizontally pulled behind the ceiling for each floor and communicated with each room. The duct 3 is provided with a plurality of smoke exhaust ports 4. In the case of a pressurized air supply facility, the direction of the airflow flowing through the ducts 2 and 3 is opposite to that in the smoke exhaust facility, and instead of the smoke exhaust port 4 and the smoke exhaust fan 1, A pressure supply fan is used.

  As described above, the number of each smoke exhaust port and each air supply port provided in the smoke prevention equipment is very large, and measuring the wind speed of all these ports is very laborious and labor intensive and requires cost. . For this reason, when only the check and check of the air volume of the smoke-proof equipment is considered, it is conceivable to reduce the labor and labor required for the check by measuring the wind speed at the few fan inlets and outlets. In this case, for example, the duct connected to the smoke exhaust fan of the smoke exhaust facility or the pressurized air supply fan of the pressurized air supply facility is removed, and the suction port of the smoke exhaust fan or the pressurized air supply fan is removed. A method of measuring the wind speed at the outlet of the air can be considered.

  As a method for measuring the wind speed at the outlet, for example, as shown in FIG. 6, a method using a Pitot-type wind speed sensor 8 such as Aero Eye (registered trademark) or an aero damper provided in a single duct 6 is considered. It is done.

  On the other hand, an apparatus disclosed in Patent Document 2 is known as a conventional air volume measuring apparatus.

JP-A-8-270398 JP 2005-265726 A

  By the way, a damper for adjusting the amount of passing air is provided at each of the above-described smoke exhaust ports and air supply ports. A small gap may be formed in the damper in the closed state, and a small amount of air may be leaked from the gap as a leakage air amount (a suction air amount or a blown air amount) at the operation stage of the smoke prevention equipment.

  If the amount of leaked air is expected at locations other than the smoke exhaust port and air supply port (where the damper is closed) that is subject to airflow measurement, the intake port of the smoke exhaust fan using the conventional airflow measurement device described above Measure the air velocity at multiple points at the air outlet of the fan for pressurized air supply or pressure, and try to obtain the air volume by the fan from the surface wind speed based on these, but if you do not consider the air volume loss due to the leaked air volume, It is difficult to estimate the exact air volume passing through the air outlet. In this case, there is a possibility that the air volume at the smoke exhaust port or the air supply port to be measured is estimated to be larger than the air volume required for the facility.

  This invention is made in view of the above, Comprising: The air volume measuring apparatus of the smoke prevention equipment which can measure the air volume of smoke prevention equipment provided with a several smoke exhaust port and an air supply port simply and appropriately The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an air volume measuring device for smoke-proof equipment according to claim 1 of the present invention is a smoke-exhaust mechanism or a pressure supply having a smoke-exhaust fan and a plurality of smoke exhaust ports. An air volume measuring device for measuring an air volume of a smoke-proof facility comprising at least one of a pressure fan and a pressurized air supply mechanism having a plurality of air supply ports, a main duct and a bypass duct arranged in parallel to the main duct And an air volume measuring means for measuring an air volume by the fan passing through the main duct and the bypass duct, and a ventilation resistance varying means for varying the ventilation resistance of the bypass duct.

  According to a second aspect of the present invention, there is provided the air flow measuring device for smoke-proof equipment according to the first aspect, wherein the ventilation resistance variable means is an open / close damper provided in a resistance duct arranged in series with the bypass duct. It is characterized by that.

  Moreover, the air volume measuring device for smoke-proof equipment according to claim 3 of the present invention is characterized in that, in the above-described claim 1 or 2, the main duct and the bypass duct have the same cross-sectional shape.

  An air volume measuring device for smoke-proof equipment according to claim 4 of the present invention is the fan outlet or suction port of the fan according to any one of claims 1 to 3, wherein the main duct and the bypass duct are connected to each other. It further has a flexible duct for connecting to.

  An air volume measuring device for smoke-proof equipment according to the present invention includes at least a smoke exhaust mechanism having a smoke exhaust fan and a plurality of smoke exhaust ports or a pressurized air supply mechanism having a pressurized air supply fan and a plurality of air supply ports. An air volume measuring device for measuring the air volume of a smoke-proof facility comprising one side, measuring the air volume by a main duct, a bypass duct arranged in parallel to the main duct, and the fan passing through the main duct and the bypass duct Air flow measuring means for adjusting the air flow resistance of the bypass duct, and by applying to the air flow measurement at the time of maintenance and management of the smoke-proof equipment, it is possible to exhaust smoke by the air flow resistance by the air flow resistance variable means. It is possible to consider the amount of air leakage at the mouth and the air supply port. Therefore, the air volume of the smoke-proof equipment can be measured easily and appropriately. For this reason, the labor and labor conventionally required for measuring the air volume at each smoke outlet and each air supply port can be reduced, and the one corresponding to the required air volume at each smoke outlet and each air supply opening can be simplified. In addition, there is an effect that inspection can be performed at low cost.

FIG. 1 is a side sectional view showing an embodiment of an air volume measuring device for smoke-proof equipment according to the present invention. 2A and 2B are side sectional views of the open / close damper, where FIG. 2A is a diagram illustrating a fully open state, FIG. 2B is a diagram illustrating a case of an intermediate opening degree, and FIG. FIGS. 3A and 3B are enlarged side sectional views of the connection port, where FIG. 3A is a diagram illustrating a case of fixing with bolts, and FIG. FIG. 4 is a side sectional view of a connecting portion between the flexible duct and the attachment port. FIG. 5 is a schematic system diagram showing an example of conventional smoke exhausting equipment (smoke prevention equipment). FIG. 6 is a side sectional view showing a conventional air volume measuring device using a single duct.

  In the following, the embodiment of the air flow measuring device for smoke-proof equipment according to the present invention will be described in detail with reference to the drawings, taking as an example the case where it is applied to a smoke exhaust mechanism having a smoke exhaust fan and a plurality of smoke exhaust ports. explain. Note that the air volume measuring device for smoke-proof equipment according to the present invention can be applied to a pressurized air supply mechanism or a mechanism including both a pressurized air supply mechanism and a smoke exhausting mechanism. In any case, the present invention is not limited by this embodiment.

As shown in FIG. 1, an air volume measuring device 100 for smoke prevention equipment according to the present invention passes through a main duct 10, a bypass duct 12 arranged in parallel to the main duct 10, and the main duct 10 and the bypass duct 12. Wind speed measuring means 16a and 16b as air volume measuring means for measuring the air volumes Q ₁ and Q ₂ to be performed, and a resistance duct 14 as a ventilation resistance varying means for varying the ventilation resistance of the bypass duct 12 are provided. Further, the air volume measuring device 100 includes a flexible duct 18 and an attachment port 20 to a suction port of a smoke exhaust fan (not shown).

  In the present invention, the amount of air leaked from the smoke exhaust port (not shown) is taken into account by the resistance duct 14, thereby measuring the air amount at each smoke exhaust port and each air supply port on each floor, and measuring the air amount near the fan. Can be substituted. For this reason, it is possible to easily and appropriately measure the air volume at each smoke exhaust port and each air supply port of each floor at the maintenance management stage of the smoke prevention equipment without requiring labor and labor.

  Here, when the air volume measuring device 100 of the present invention is attached to the outlet of the pressurized air supply fan of the pressurized air supply mechanism, the connection port 22 of the flexible duct 18 is connected to the inflow side of the main duct 10 and the bypass duct 12. It is sufficient to connect to the mouth (opening on the upper end side in FIG. 1).

The main duct 10 can be formed of a steel duct that is normally used in smoke exhaust equipment. Basically the main duct 10, to have the cross-sectional area of about 0.25 m ² to 1 m ^2, the duct length several times the duct diameter. Wind speed measuring means 16 a is fitted in the main duct 10. The air flow rate Q ₁ of the main duct 10 obtained by subtracting the air flow rate Q ₂ of the bypass duct 12 from the fan air flow rate Q ₀ becomes the air flow rate of the smoke exhaust ports and air supply ports of each floor to be measured.

Similarly to the main duct 10, the bypass duct 12 can also be configured by a steel duct that is normally used in smoke exhausting equipment. A resistance duct 14 is arranged in series in the bypass duct 12, and a wind speed measuring means 16b is fitted therein. The air volume Q ₂ passing through the bypass duct 12 is an air volume corresponding to the amount of air leaked from other than the smoke exhaust port and the air supply port of each floor to be measured. Here, by making the bypass duct 12 and the main duct 10 have the same cross-sectional shape, the ventilation resistance effect by the resistance duct 14 can be enhanced.

  The resistance duct 14 is for changing the ventilation resistance in the bypass duct 12 and includes an open / close damper 24 whose opening degree can be adjusted as shown in FIG.

As shown in FIGS. 2A to 2C, the opening degree of the opening / closing damper 24 is obtained by manually operating an operation lever or dial (not shown) provided in the resistance duct 14 and rotating the rotating shaft 24a. Can be variably adjusted in the range from fully closed to fully open. The closer the open / close damper 24 is to the fully closed state, the larger the airflow resistance value in the bypass duct 12, the smaller the air volume Q ₂ passing through the bypass duct 12 with respect to the air volume Q ₀ from the fan, and the air volume passing through the main duct 10. Q ₁ increases. On the other hand, as the opening and closing damper 24 is near fully open, the ventilation resistance value of the bypass duct 12 is reduced, airflow rate Q ₂ to which passes through the bypass duct 12 to the wind amount Q ₀ of the fan increases, passes through a main duct 10 The air volume Q ₁ is reduced.

  Here, regarding the setting of the amount of leaked air, that is, the setting of the opening degree, as shown in FIG. 5, closing of the smoke exhaust damper or the air supply damper (not shown) provided in the smoke exhaust port 4 (or the air supply port 4). A predetermined amount of leakage air can be set by previously obtaining a ventilation resistance value of the passage of time and giving an opening corresponding to the ventilation resistance value to the open / close damper 24 of the resistance duct 14. Further, as the ventilation resistance value, the ventilation resistance value of the route set at the design planning stage of the smoke-proof equipment may be used. Since the opening / closing damper 24 can adjust the opening degree from fully closed to fully open, it can correspond to any ventilation resistance value. In addition, even when a part of the smoke exhaust damper or the air supply damper on the route is opened due to construction or the like, it is possible to measure the air volume in consideration of that.

The wind speed measuring means 16a, 16b is composed of a Pitot tube type wind speed sensor such as Aero Eye (registered trademark) or an aero damper generally used for wind speed measurement in an air conditioning facility, or a fine differential pressure gauge for measuring dynamic pressure. Can do. The respective passing air volumes Q ₁ and Q ₂ can be obtained from the wind speed measured by the wind speed measuring means 16a and 16b.

  The flexible duct 18 is made of a flexible material and form that can be bent and moved freely to facilitate attachment to a smoke exhaust fan or a pressurized air supply fan (not shown). It is. As this flexible duct 18, what was comprised by steel, vinyl, etc. in the shape of a bellows can be used, for example.

  The flexible duct 18 is connected to the main duct 10 and the bypass duct 12 through a steel connection port 22. As shown in FIGS. 3A and 3B, the connection port 22 is provided with a packing 28 made of rubber or the like in order to make it difficult for air to leak. In these ducts 10, 12, and 18, irregularities such as threads may be provided in contact portions with the packing 28. In this way, higher airtightness can be ensured. Further, the ducts 10, 12, and 18 may be joined and fixed by bolts and nuts 26 as shown in FIG. 3 (a), or a rotary type restraint as shown in FIG. 3 (b). The metal fitting 30 may be joined and fixed. The resistance duct 14 and the wind speed measuring means 16a and 16b are also configured to suppress air leakage by the same configuration.

  As shown in the enlarged side sectional view of FIG. 4, the attachment port 20 to the smoke exhaust fan or the pressurized air supply fan has a shape of the fan suction port 34 (or the blowout port 34) and irregularities around the port 34. It is made of a flexible material such as vinyl so that it can be easily connected without being affected by the above. The attachment port 20 includes a packing 28 made of rubber or the like disposed on the inner periphery so that air does not easily leak at a contact portion with the suction port 34 (or the blow-out port 34), and a fastening metal fitting 32 for tightening disposed on the outer periphery. And can be easily fixed in the vicinity of the fan inlet 34 (or the outlet 34) of the fan.

  By configuring as described above, according to the present invention, by applying to the air volume check at the time of maintenance and management of the smoke proofing equipment, it is possible to easily and easily obtain the one corresponding to the required air volume of each smoke outlet and each air supply opening. Inspection is possible at low cost.

  Some smoke-proof equipment blows air into the room during operation. In particular, the pressurized air supply facility has a high possibility of scattering dust and dirt accumulated in the duct and fan in the room. For this reason, in smoke-proof equipment in buildings such as commercial facilities, there is a possibility that the operation of commercial facilities will be partially stopped and the performance confirmed. This may cause commercial loss of commercial facilities. However, the air volume measuring device of the present invention can estimate the air volume at each air supply port in the vicinity of the pressurized air supply fan with the duct cut off during operation of the smoke prevention equipment. Therefore, it is possible to avoid the occurrence of the above-mentioned operating loss.

  Moreover, the air volume measuring device of the present invention can be applied not only to a building such as a commercial facility but also to an air volume inspection of smoke prevention equipment in a civil engineering structure such as a tunnel.

  As described above, according to the present invention, at least one of a smoke exhaust mechanism having a smoke exhaust fan and a plurality of smoke exhaust ports, or a pressurized air supply mechanism having a pressurized air supply fan and a plurality of air supply ports is provided. An air volume measuring device for measuring an air volume of a smoke prevention facility comprising a main duct, a bypass duct arranged in parallel to the main duct, and an air volume by the fan passing through the main duct and the bypass duct Since the airflow measuring means and the airflow resistance variable means for changing the airflow resistance of the bypass duct are provided, the smoke exhaust port is controlled by the airflow resistance by the airflow resistance variable means when applied to the airflow measurement at the time of maintenance and management of the smokeproof equipment. It is possible to consider the amount of air leakage at the air supply port or the like. Therefore, the air volume of the smoke-proof equipment can be measured easily and appropriately. For this reason, the labor and labor conventionally required for measuring the air volume at each smoke outlet and each air supply port can be reduced, and the one corresponding to the required air volume at each smoke outlet and each air supply opening can be simplified. In addition, there is an effect that inspection can be performed at low cost.

  As described above, the air volume measuring device for smoke proofing equipment according to the present invention is used to confirm the performance of smoke proofing equipment such as smoke evacuation equipment and pressurized air supply equipment for buildings such as commercial facilities and civil engineering structures such as tunnels. It is useful for an air volume measuring device to be used, and is particularly suitable for an air volume measuring device used for air volume inspection at the time of maintenance and management of smoke prevention equipment.

10 Main duct 12 Bypass duct 14 Resistance duct (Ventilation resistance variable means)
16a, 16b Wind speed measuring means (air volume measuring means)
18 Flexible duct 20 Mounting port 22 Connection port 24 Opening / closing damper 24a Rotating shaft 26 Bolt and nut 28 Packing 30, 32 Holding bracket 34 Suction port (outlet port)
100 Air volume measuring device for smoke prevention equipment

Claims (4)

Air volume measurement to measure the air volume of smoke prevention equipment consisting of at least one of a smoke exhaust mechanism having a smoke exhaust fan and a plurality of smoke exhaust ports, or a pressurized air supply mechanism having a pressurized air supply fan and a plurality of air supply openings A device,
A main duct, a bypass duct arranged in parallel with the main duct, an air volume measuring means for measuring an air volume by the fan passing through the main duct and the bypass duct, and a variable ventilation resistance for varying the ventilation resistance of the bypass duct And an air volume measuring device for smoke-proof equipment.   The air flow measuring device for smoke-proof equipment according to claim 1, wherein the ventilation resistance variable means is an open / close damper provided in a resistance duct arranged in series with the bypass duct.   The air volume measuring device for smoke-proof equipment according to claim 1 or 2, wherein the main duct and the bypass duct have the same cross-sectional shape.   The air volume of the smoke-proof equipment according to any one of claims 1 to 3, further comprising a flexible duct for connecting the main duct and the bypass duct to a blow-out port or a suction port of the fan. Measuring device.

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