JP3372097B2 - Ventilation resistance measuring device - Google Patents
Ventilation resistance measuring deviceInfo
- Publication number
- JP3372097B2 JP3372097B2 JP00282994A JP282994A JP3372097B2 JP 3372097 B2 JP3372097 B2 JP 3372097B2 JP 00282994 A JP00282994 A JP 00282994A JP 282994 A JP282994 A JP 282994A JP 3372097 B2 JP3372097 B2 JP 3372097B2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- gas
- sample
- suction path
- differential pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は紙巻たばこ、フィルタ−
などを検体として通気抵抗を測定する装置に関するもの
である。
【０００２】
【従来の技術】紙巻たばこのフィルタ−は、各製品にお
いては、一定の通気抵抗のものでなければならない。従
来、通気抵抗を測定する装置においては、例えばフィル
タ−のような検体の一端側から一定の基準流量で吸引を
行い、検体の入口と出口の圧力差を計測する装置が知ら
れている。特公平５−４５１３５号は、図２に示すよう
に、一定の基準流量で吸引を行うために、検体Ｓと吸引
ポンプ１０の間に多重毛管要素式センサＨと制御バルブ
９を設け、吸引経路１３内において、この多重管要素式
センサＨで差圧を感知し、これを流速へ換算したうえで
バルブ制御を行い設定基準流量とするものである。すな
わち、検体の単位面積あたり、検体を通る圧力差に対す
る空気の流れの速度をもって通気性を測定する装置であ
る。
【０００３】
【発明が解決しようとする課題】しかしながら、このよ
うな装置では、吸引する空気の量を所定量とするために
多重管要素式センサＨで吸引経路内の差圧を測定し、こ
れを流速へ換算したうえで制御バルブの開度を制御する
機構である。そのため、制御回路が複雑となり、また吸
引する空気の流速を基準としているため、配管中の圧力
損失や乱流又は流体温度の影響を受け、それが測定精度
に影響するという問題点がある。本発明は、紙巻たば
こ、フィルタ−などの充填体からなる検体の通気抵抗測
定を正確に行うことができ、かつコンパクトな測定装置
を提供することを課題とする。
【０００４】
【課題を解決するための手段】上記課題を解決するため
になした本発明の通気抵抗測定装置は、棒状の検体の中
を通過する気体の通気抵抗を測定する装置であって、検
体の一端側が大気に開放され、他の端側に気体を吸引す
る吸引路を接続するように検体を保持するための保持部
材と、前記吸引路を介して一定の流量の気体を吸引する
ための真空ポンプと、該気体を一定流量に設定するため
の基準流量設定手段と、前記吸引路中の気体の質量流量
を測定する熱式の質量流量計と、該流量計と連結され、
前記真空ポンプとの間に位置する制御バルブと、検体の
流入側と吸引側の差圧を測定する差圧計とを有し、検体
の規格に応じた校正用基準プラグを前記保持部材にセッ
トして前記吸引路を介して吸引する気体の質量流量を前
記制御バルブにより一定流量とした後、前記校正用基準
プラグに替えて前記保持部材に検体をセットし、前記差
圧計を用いて検体の流入側と吸引側の差圧を測定するこ
とを特徴とする。
【０００５】
【作用】真空ポンプ１０により吸引を開始し、その流量
を流量計によって測定する。流量計と連結された制御バ
ルブにより、設定された流量に制御される。この時、流
速に関係なく質量流量を測定しているため、管内の圧力
損失等の影響も受けずに、正確な流量に設定できる。そ
して、所定の気体流量になった後、検体の流入側と吸引
側の差圧を測定する。
【０００６】
【実施例】図１は、本発明の通気抵抗測定装置の一実施
例を示す構成図である。検体であるたばこのフィルタ−
Ｓは、保持部材としてのプラグホルダ−１へセットさ
れ、このとき、フィルタ−Ｓの一端は大気に開放され、
他の一端は真空ポンプ１０により吸引路１３を介して吸
引される。プラグホルダ−１内は、チャック用ゴムチュ
−ブ１ａにより検体を保持するようになっており、その
開閉は検体装着用切換弁１１で行う。
【０００７】吸引路１３中に設けられた流量計７は質量
流量センサを使用し、流体の質量流量を測定するもので
ある。これは、センサ管内には２つの発熱抵抗体が巻か
れており、電流を流しセンサを加熱すると、気体が流れ
た時に２点間で温度差が生じ、この温度変化を抵抗値変
化として捉え、これらと気体の比熱とが関数関係にある
ことを利用して流量を測定するものである。そして、こ
の流量計７は制御バルブ９と連結されており、基準流量
設定手段である設定器１２により設定された流量が正確
に流れているかを流量計７と制御バルブ９によって制御
を行うものである。この時、気体の流速を流量へ換算す
ることなく、温度変化から流量を測定しているので、管
内の乱流や圧力損失の影響を低減し正確かつ応答性がよ
く制御できる。本実施例では、流量計として熱式の質量
流量計を用いたが、ロ−タメ−タでもよい。
【０００８】次に、測定方法について説明する。検体装
着用切換弁１１によって、プラグホルダ−１内のチャッ
ク用ゴムチュ−ブ１ａを開き、そこに校正用基準プラグ
をセットする。この校正用基準プラグは、３００mmAq用
と６００mmAq用その他複数あり、検体の規格により選択
されるものである。例えば、たばこのフィルタ−であれ
ば各銘柄により通気抵抗が決められていて、被測定物に
よって適当な校正用基準プラグを選択する。校正用基準
プラグをセットした後、チャック用ゴムチュ−ブ１ａを
プラグへ密着させる。
【０００９】次に、真空ポンプ１０により吸引を開始
し、基準流量の設定器１２で基準流量である１７.５cc
／secに調整する。この時、流量計７で流量を計測し、
バルブ制御回路８を介して制御バルブ９で設定基準流量
となるように連続的に制御が行われる。設定した基準流
量となった後、校正用基準プラグを取り外し被測定用フ
ィルタ−Ｓをプラグホルダ−１へセットする。
【００１０】そして、差圧センサ２によって、被測定用
フィルタ−Ｓの流入側と吸引側の差圧を測定し、差圧力
ディスプレイ３で差圧を読取り、所定の通気抵抗値であ
るかどうかの確認を行う。
【００１１】
【発明の効果】以上説明したように本発明の通気抵抗測
定装置によれば、基準流量の設定制御を直接気体の流量
を測定し、制御バルブで連続的に制御を行うようにした
ので、管内の乱流や圧力損失の影響を低減し正確かつ応
答性がよく制御できる。このように、常に一定した空気
流量の下で通気抵抗が測定できる。また、バルブ制御回
路が複雑でなく装置全体がコンパクトとなる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cigarette and a filter.
The present invention relates to an apparatus for measuring airflow resistance using a sample as a sample. 2. Description of the Prior Art Cigarette filters must have a constant airflow resistance in each product. 2. Description of the Related Art Conventionally, as an apparatus for measuring airflow resistance, an apparatus, such as a filter, for performing suction at a constant reference flow rate from one end of a sample and measuring a pressure difference between an inlet and an outlet of the sample is known. In Japanese Patent Publication No. 5-45135, a multi-capillary element sensor H and a control valve 9 are provided between a sample S and a suction pump 10 to perform suction at a constant reference flow rate, as shown in FIG. In 13, the differential pressure is sensed by the multiple pipe element type sensor H, converted into a flow rate, and then valve-controlled to set a reference flow rate. That is, it is an apparatus that measures air permeability based on the velocity of air flow with respect to the pressure difference passing through a specimen per unit area of the specimen. However, in such an apparatus, a differential pressure in a suction path is measured by a multi-tube element type sensor H in order to set a predetermined amount of air to be suctioned. Is a mechanism for controlling the opening of the control valve after converting the flow rate into a flow rate. Therefore, the control circuit becomes complicated, and the flow rate of the air to be sucked is used as a reference. Therefore, the control circuit is affected by pressure loss, turbulence or fluid temperature in the piping, which affects measurement accuracy. SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact measuring device that can accurately measure the ventilation resistance of a sample composed of a packing material such as a cigarette or a filter. SUMMARY OF THE INVENTION [0004] A ventilation resistance measuring apparatus according to the present invention for solving the above-mentioned problems is an apparatus for measuring the ventilation resistance of a gas passing through a rod-shaped specimen, A holding member for holding the sample so that one end side of the sample is open to the atmosphere and a suction path for sucking gas to the other end side, and for sucking a constant flow rate of gas through the suction path A vacuum pump, a reference flow rate setting means for setting the gas at a constant flow rate, a thermal mass flow meter for measuring a mass flow rate of the gas in the suction passage, and a connection with the flow meter. And
A control valve located between the vacuum pump and a differential pressure gauge for measuring a differential pressure between the inflow side and the suction side of the sample,
Set a reference plug for calibration according to
After the mass flow rate of the gas to be suctioned through the suction path is set to a constant flow rate by the control valve, the calibration reference
Set the sample on the holding member instead of the plug,
It is characterized in that the pressure difference between the inflow side and the suction side of the sample is measured using a manometer . The suction is started by the vacuum pump 10 and the flow rate is measured by a flow meter. The set flow rate is controlled by a control valve connected to the flow meter. At this time, since the mass flow rate is measured irrespective of the flow velocity, an accurate flow rate can be set without being affected by pressure loss or the like in the pipe. After reaching a predetermined gas flow rate, the differential pressure between the inflow side and the suction side of the sample is measured. FIG. 1 is a block diagram showing an embodiment of a ventilation resistance measuring apparatus according to the present invention. Filter for tobacco as a sample
S is set in a plug holder-1 as a holding member, and at this time, one end of the filter S is opened to the atmosphere,
The other end is sucked by the vacuum pump 10 via the suction path 13. The sample is held in the plug holder-1 by a rubber tube 1a for chuck, and the opening and closing thereof is performed by a sample mounting switching valve 11. The flow meter 7 provided in the suction path 13 uses a mass flow sensor to measure the mass flow of the fluid. This is because two heating resistors are wound in the sensor tube, and when a current flows and the sensor is heated, a temperature difference occurs between two points when gas flows, and this temperature change is regarded as a resistance value change. The flow rate is measured using the fact that these and the specific heat of the gas have a functional relationship. The flow meter 7 is connected to the control valve 9 and controls whether the flow rate set by the setting device 12 as the reference flow rate setting means is flowing accurately by the flow meter 7 and the control valve 9. is there. At this time, since the flow rate is measured from the temperature change without converting the gas flow rate into the flow rate, the influence of turbulent flow and pressure loss in the pipe can be reduced, and accurate and responsive control can be performed. In this embodiment, a thermal mass flow meter is used as the flow meter, but a rotor may be used. Next, a measuring method will be described. The chuck rubber tube 1a in the plug holder 1 is opened by the sample mounting switching valve 11, and a calibration reference plug is set therein. There are a plurality of reference plugs for calibration for 300 mmAq and others for 600 mmAq, which are selected according to the standard of the specimen. For example, in the case of a cigarette filter, the ventilation resistance is determined by each brand, and an appropriate calibration reference plug is selected according to the measured object. After setting the calibration reference plug, the rubber tube for chuck 1a is brought into close contact with the plug. Next, suction is started by the vacuum pump 10, and the reference flow rate setting unit 12 sets the reference flow rate of 17.5 cc.
/ Sec. At this time, the flow rate is measured by the flow meter 7,
Control is continuously performed by the control valve 9 via the valve control circuit 8 so that the reference flow rate is set. After the set reference flow rate is reached, the calibration reference plug is removed, and the filter-S to be measured is set in the plug holder-1. Then, the differential pressure sensor 2 measures the differential pressure between the inflow side and the suction side of the filter-under-measurement S, reads the differential pressure on the differential pressure display 3, and determines whether or not it is a predetermined ventilation resistance value. Make a confirmation. As described above, according to the ventilation resistance measuring apparatus of the present invention, the setting of the reference flow rate is controlled directly by directly measuring the gas flow rate and continuously controlled by the control valve. Therefore, the effects of turbulence and pressure loss in the pipe can be reduced, and accurate and responsive control can be achieved. Thus, the ventilation resistance can be measured under a constant air flow rate. In addition, the valve control circuit is not complicated, and the entire apparatus is compact.
【図面の簡単な説明】
【図１】本発明の一実施例を示す図である。
【図２】従来の通気抵抗測定装置を示す図である。
【符号の説明】
Ｓ 検体、１ プラグホルダ−、２ 差圧計、３ 差圧
力ディスプレイ、４ エアフィルタ−、５ 流量調節
弁、６ エアフィルタ−、７ 流量計、８バルブ制御回
路、９ 制御バルブ、１０ 真空ポンプ、１１ 検体装
着用切換弁、１２ 基準流量設定器、１３ 吸引路、Ｈ
多重毛管要素式センサBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing a conventional airflow resistance measuring device. [Description of Signs] S sample, 1 plug holder, 2 differential pressure gauge, 3 differential pressure display, 4 air filter, 5 flow control valve, 6 air filter, 7 flow meter, 8 valve control circuit, 9 control valve, Reference Signs List 10 vacuum pump, 11 sample mounting switching valve, 12 reference flow rate setting device, 13 suction path, H
Multiple Capillary Element Sensor
Claims (1)
抗を測定する装置であって、 検体の一端側が大気に開放され、他の端側に気体を吸引
する吸引路を接続するように検体を保持するための保持
部材と、 前記吸引路を介して一定の流量の気体を吸引するための
真空ポンプと、前記吸引路を流れる気体の流量を調整する制御バルブ
と、 前記 吸引路中の気体の質量流量を測定する熱式の質量流
量計と、前記吸引路に流すべき気体の基準流量を設定するための
基準流量設定手段と、 前記質量流量計により測定される質量流量が上記基準流
量設定手段により設定された基準流量となるように前記
制御バルブの開度を制御するバルブ制御回路と、 検体の流入側と吸引側の差圧を測定する差圧計とを有
し、検体の規格に応じた校正用基準プラグを前記保持部材に
セットして前記吸引路を介して 吸引する気体の質量流量
を前記制御バルブにより一定流量とした後、前記校正用
基準プラグに替えて前記保持部材に検体をセットし、前
記差圧計を用いて検体の流入側と吸引側の差圧を測定す
ることを特徴とする通気抵抗測定装置。(57) [Claims 1] An apparatus for measuring the air flow resistance of a gas passing through a rod-shaped specimen, wherein one end of the specimen is open to the atmosphere and gas is supplied to the other end. A holding member for holding a sample so as to connect a suction path for suctioning, a vacuum pump for sucking a constant flow rate of gas through the suction path, and adjusting a flow rate of gas flowing through the suction path. Control valve
If, thermal mass flow measuring the mass flow rate of gas in the suction path
And a meter for setting a reference flow rate of gas to be passed through the suction path.
Reference flow rate setting means, and the mass flow rate measured by the mass flow meter is the reference flow rate.
So that the reference flow rate set by the amount setting means
A valve control circuit that controls the opening of the control valve, and a differential pressure gauge that measures the differential pressure between the inflow side and the aspiration side of the sample, and a calibration reference plug according to the sample standard is provided on the holding member.
After setting the mass flow rate of the gas to be suctioned through the suction path to a constant flow rate by the control valve ,
Set the sample on the holding member in place of the reference plug,
An air flow resistance measuring device for measuring a differential pressure between an inflow side and an aspiration side of a sample using a differential pressure gauge .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00282994A JP3372097B2 (en) | 1994-01-14 | 1994-01-14 | Ventilation resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00282994A JP3372097B2 (en) | 1994-01-14 | 1994-01-14 | Ventilation resistance measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07209171A JPH07209171A (en) | 1995-08-11 |
| JP3372097B2 true JP3372097B2 (en) | 2003-01-27 |
Family
ID=11540315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00282994A Expired - Fee Related JP3372097B2 (en) | 1994-01-14 | 1994-01-14 | Ventilation resistance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3372097B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005057184A1 (en) * | 2003-12-12 | 2005-06-23 | Ngk Insulators, Ltd. | Device for measuring filter pressure loss |
| CN108519319A (en) * | 2018-05-25 | 2018-09-11 | 华南理工大学 | The flow resistance measuring device and method of a kind of negative-pressure type porous material and its product |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303340A (en) * | 2018-01-26 | 2018-07-20 | 恒勃控股股份有限公司 | Six canister filter detection device of state and detection method |
| CN108593018A (en) * | 2018-06-05 | 2018-09-28 | 润电能源科学技术有限公司 | A kind of vacuum pump pumping system for measuring quantity, vacuum pump and vacuum system |
-
1994
- 1994-01-14 JP JP00282994A patent/JP3372097B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005057184A1 (en) * | 2003-12-12 | 2005-06-23 | Ngk Insulators, Ltd. | Device for measuring filter pressure loss |
| US7608138B2 (en) | 2003-12-12 | 2009-10-27 | Ngk Insulators, Inc. | Device for measuring filter pressure loss |
| CN108519319A (en) * | 2018-05-25 | 2018-09-11 | 华南理工大学 | The flow resistance measuring device and method of a kind of negative-pressure type porous material and its product |
| CN108519319B (en) * | 2018-05-25 | 2023-12-22 | 华南理工大学 | Negative pressure type porous material and flow resistance measuring device and method for product of negative pressure type porous material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07209171A (en) | 1995-08-11 |
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