JPH0672623U - Clogging detection device - Google Patents
Clogging detection deviceInfo
- Publication number
- JPH0672623U JPH0672623U JP2171993U JP2171993U JPH0672623U JP H0672623 U JPH0672623 U JP H0672623U JP 2171993 U JP2171993 U JP 2171993U JP 2171993 U JP2171993 U JP 2171993U JP H0672623 U JPH0672623 U JP H0672623U
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- hall
- permanent magnet
- detection device
- operating member
- 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.)
- Pending
Links
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- Filtering Of Dispersed Particles In Gases (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
(57)【要約】
【目的】 目詰まり検知装置内のホールICと永久磁石
を対向させ、遮へい板を作動部材に立設してそれらの間
に位置させて目詰まり検知装置の誤報知を回避させる。
【構成】 容器1内にダイヤフラム9とリテーナ10で
なる作動部材5を配設し、容器1内を負圧室1aと収納
室1bとに区画する。収納室1b内にホールIC6と永
久磁石7を対向させて配設する。負圧室1a内にスプリ
ング12を縮設する。作動部材5に遮へい板11を立設
し、ホールIC6と永久磁石7の間に位置させる。
(57) [Abstract] [Purpose] The Hall IC in the clogging detection device and the permanent magnet are opposed to each other, and a shield plate is erected on the operating member and positioned between them to avoid false notification of the clogging detection device. Let [Structure] An operating member 5 composed of a diaphragm 9 and a retainer 10 is arranged in the container 1, and the inside of the container 1 is divided into a negative pressure chamber 1a and a storage chamber 1b. The Hall IC 6 and the permanent magnet 7 are arranged to face each other in the storage chamber 1b. The spring 12 is contracted in the negative pressure chamber 1a. A shield plate 11 is erected on the operating member 5 and is located between the Hall IC 6 and the permanent magnet 7.
Description
【0001】[0001]
この考案は、例えば内燃機関のエアクリーナに用いられる目詰まり検知装置に 関し、吸入空気によって生ずる負圧を検知してフィルタの目詰まりを報知する目 詰まり検知装置に関する。 The present invention relates to a clogging detection device used for an air cleaner of an internal combustion engine, for example, and relates to a clogging detection device that detects a negative pressure generated by intake air and notifies the filter of the clogging.
【0002】[0002]
従来の目詰まり検知装置は、例えば実公平2−15533号公報に示されてい る。図2はその目詰まり検知装置の断面図であり、有底筒状の筒体21に中央に 挿通孔が形成された隔壁22aが横設された筒状の筒体22が嵌合され、皿状の 蓋23が被着されてケーシング20が形成される。ケーシング20内の筒体21 、22間にベローズ状のダイヤフラム24が取付けられて負圧室20aと大気室 20bに区画される。負圧室20aはポート21aを介してケーシング20外部 と連通される。ケーシング20内には、さらに筒体22上端と蓋23に挟持され て板状の回路基板25が横設され、回路基板25には制御回路が組込まれ中央に ホール素子26が取付けられる。ダイヤフラム24の中央にはネジ部材24aが 取付けられ、該ネジ部材には先端に永久磁石27が装着された棒状体28が永久 磁石27をホール素子に対向させて取付けられる。ホール素子26は、永久磁石 27が接近した時にホール素子26の出力電圧がOVになり、隔離時に電圧が上 昇する特性のものである。ダイヤフラム24の外側にはガイド筒29が装着され 、ガイド筒29と筒体21底部との間に圧縮バネ30が装着され、ダイヤフラム 24は上方に付勢される。 A conventional clogging detection device is disclosed, for example, in Japanese Utility Model Publication No. 2-15533. FIG. 2 is a cross-sectional view of the clogging detection device, in which a tubular body 22 having a bottomed tubular body 21 and a partition wall 22a having an insertion hole formed in the center is horizontally fitted, is fitted into a tray. The cover 20 is attached to form the casing 20. A bellows-shaped diaphragm 24 is attached between the cylinders 21 and 22 in the casing 20 to divide it into a negative pressure chamber 20a and an atmosphere chamber 20b. The negative pressure chamber 20a communicates with the outside of the casing 20 through the port 21a. Inside the casing 20, a plate-like circuit board 25 is further provided laterally sandwiched between the upper end of the tubular body 22 and the lid 23. A control circuit is incorporated in the circuit board 25 and a hall element 26 is attached at the center. A screw member 24a is attached to the center of the diaphragm 24, and a rod-shaped body 28 having a permanent magnet 27 attached to its tip is attached to the screw member with the permanent magnet 27 facing the Hall element. The Hall element 26 has a characteristic that the output voltage of the Hall element 26 becomes OV when the permanent magnet 27 approaches, and the voltage rises when isolated. A guide cylinder 29 is mounted on the outer side of the diaphragm 24, a compression spring 30 is mounted between the guide cylinder 29 and the bottom of the cylindrical body 21, and the diaphragm 24 is biased upward.
【0003】 この目詰まり検知装置は、例えばエアクリーナの空気出口管に取付けられ、ポ ート21aを介して負圧室20aと負圧源とが連通されている。そして、負圧室 20a内に負圧が伝わり設定圧を越えると圧縮バネ30の付勢力に抗してダイヤ フラム24が下方に変位し、棒状体28も下方に下り先端の永久磁石27がホー ル素子26から離れる。回路基板25に接続された端子に電源、報知ランプでな る報知手段を接続すれば、ホール素子26は出力電圧がOVから急激に大きな電 圧に上昇し報知ランプが点灯してフィルタの目詰まり状態が報知される。The clogging detection device is attached to, for example, an air outlet pipe of an air cleaner, and the negative pressure chamber 20a and the negative pressure source are communicated with each other via a port 21a. When the negative pressure is transmitted to the negative pressure chamber 20a and exceeds the set pressure, the diaphragm 24 is displaced downward against the urging force of the compression spring 30, and the rod-shaped body 28 is also lowered downward so that the permanent magnet 27 at the front end is moved. Away from the element 26. If a power supply and a notification means consisting of a notification lamp are connected to the terminals connected to the circuit board 25, the output voltage of the hall element 26 will suddenly rise from OV to a large voltage, the notification lamp will light up, and the filter will be clogged. The state is notified.
【0004】[0004]
ところで、この従来の目詰まり検知装置は、先端に永久磁石の装着された棒状 体をダイヤフラムの中央に立設し、ケーシング内に横設された隔壁の挿通孔に挿 通したものであり、挿通孔は棒状体の下降を容易にするため棒状体との間に隙間 が形成される大きさのものとなっている。このため、棒状体はベローズ状のダイ ヤフラムの変則的な下降とあいまって傾斜しながら下方に下り、ホール素子に対 して永久磁石がずれて対向してしまう。 By the way, in this conventional clogging detection device, a rod-shaped body with a permanent magnet attached to the tip is erected at the center of the diaphragm, and is inserted into the insertion hole of the partition wall installed horizontally in the casing. The holes are sized so that a gap is formed between them so that the rod-shaped body can be lowered easily. For this reason, the rod-shaped body descends downward while inclining together with the irregular lowering of the bellows-shaped diaphragm, and the permanent magnets are displaced and face the Hall element.
【0005】 従って、ホール素子には永久磁石の磁界が斜めに当り、ホール素子に作用する 磁束は垂直に下降した時よりも減少してしまい、設定における永久磁石の正規の 下降位置に達する前にホール素子には大きな電圧が発生し報知ランプを点灯する ことになり、誤った目詰まり報知を行うことになる。Therefore, the magnetic field of the permanent magnet impinges obliquely on the Hall element, and the magnetic flux acting on the Hall element is smaller than that when vertically descending, before reaching the regular lowering position of the permanent magnet in the setting. A large voltage will be generated in the Hall element, and the notification lamp will be turned on, resulting in an erroneous clogging notification.
【0006】[0006]
本考案の目詰まり検知装置は、容器の内部がダイヤフラムとリテーナでなる作 動部材で負圧室と収納室とに区画され、収納室内に、ホール素子と制御回路とか らなるホールICと永久磁石とが対向してそれぞれ配設され、さらに負圧室底壁 と前記作動部材との間にスプリングが縮設され、遮へい板がホールICと永久磁 石との間に位置するように作動部材に立設されたものである。 In the clogging detection device of the present invention, the inside of the container is partitioned into a negative pressure chamber and a storage chamber by an operating member composed of a diaphragm and a retainer, and the hall IC including a Hall element and a control circuit and a permanent magnet are provided in the storage chamber. Are arranged so as to face each other, and a spring is contracted between the bottom wall of the negative pressure chamber and the operating member so that the shield plate is located between the Hall IC and the permanent magnet on the operating member. It was erected.
【0007】[0007]
考案の目詰まり検知装置を、例えば内燃機関のエアクリーナの出口管に管内と 負圧室内とを連通させて装着し、ホールICに報知手段を接続すると、出口管内 の負圧が負圧室に伝えられる。負圧が所定値以上になれば作動部材が下降し、同 時に遮へい板も下方に下りホールICに永久磁石の磁界が到達する。遮へい板の 下降が垂直でなくてもホールICには永久磁石の磁界は垂直降下時と同じ磁束密 度が作用して大きな電圧が生じ報知ランプが点灯し、フィルタの目詰まり状態が 報知される。 The clogging detection device of the present invention is installed, for example, in the outlet pipe of the air cleaner of the internal combustion engine so that the inside of the pipe communicates with the negative pressure chamber, and the alarm means is connected to the Hall IC, the negative pressure inside the outlet pipe is transmitted to the negative pressure chamber. To be When the negative pressure exceeds a predetermined value, the operating member descends, and at the same time, the shield plate also descends downward and the magnetic field of the permanent magnet reaches the Hall IC. Even if the shield plate does not fall vertically, the magnetic field of the permanent magnet acts on the Hall IC with the same magnetic flux density as when vertically descending, generating a large voltage and turning on the indicator lamp, which notifies the filter clogging state. .
【0008】[0008]
本考案の実施例を図1により説明する。図中、1は容器で合成樹脂製の上ケー シング2に金属製の下ケーシング3を嵌合させて形成される。上ケーシング2は カップ状で開放端周縁に断面がコ字状に窪む嵌合凹部2aが形成され、上壁に金 属製の接続体14、14が立設され、さらに外部と連通する大気口13が設けら れる。大気口13にはU字状のゴム製管体15が嵌込まれる。下ケーシング3も カップ状をなし、開放端周縁が断面コ字状に曲折されて嵌合突部3aが形成され 、底壁に通孔を有しその一部が縮径されて制限孔をなし下端外壁にネジ部が形成 された筒状の金属製連結管3bが固設される。 An embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a container, which is formed by fitting an upper casing 2 made of synthetic resin and a lower casing 3 made of metal. The upper casing 2 has a cup-like shape, and a fitting recess 2a having a U-shaped cross section is formed around the open end of the upper casing 2. The upper wall is provided with metal-made connecting bodies 14 and 14 and is connected to the outside. A mouth 13 is provided. A U-shaped rubber tube body 15 is fitted into the atmosphere opening 13. The lower casing 3 also has a cup shape, and the periphery of the open end is bent to have a U-shaped cross section to form a fitting protrusion 3a. The bottom wall has a through hole and a part of the hole has a reduced diameter to form a restriction hole. A cylindrical metal connecting pipe 3b having a threaded portion is fixedly installed on the outer wall of the lower end.
【0009】 容器1内には、保持部材4と作動部材5がそれらの外周縁が下ケーシング3の 嵌合突部3a内側に挟持されて横設され、容器1内は負圧室1aと収納室1bと に区画される。保持部材4は、合成樹脂製で中央に開口が設けられた円板状の底 壁と底壁に立設された円筒状の側壁3aとでなり、側壁4aに切欠き4bが形成 される。保持部材4の側壁4a内側には、単一極性の磁界の上昇によって作動す るホール素子と制御回路とからなるホールIC6が一側を前記切欠き4bに嵌合 されて配設され、さらに永久磁石7が一方の極をホールIC6に対向させて磁界 の上昇する位置すなわちホール素子に急激な電圧上昇が生ずる磁束密度が作用す る位置に配設される。保持部材は開口が設けられた円板状の底壁に開口を挟んで 一対の板状側壁を立設してもよい。ホールIC6の一側は上ケーシング2上壁か ら垂下された棒体8に連結される。棒体8は上端に棒体8を昇降させてホールI C6の位置を調整するネジ部8aが形成される。作動部材5はダイヤフラム9と リテーナ10でなり、ダイヤフラム9は略薄肉円盤状をなし、金属製で略皿状の リテーナ10に重ねられそれらの中心がリベット止めされる。リテーナ10の開 放端にはガイド縁10aが設けられる。ダイヤフラム9にはリベットと一体化さ れた遮へい板11が立設される。遮へい板11は鉄、ニッケル、コバルト等の金 属やこれら金属の粉体を混練した合成樹脂等の磁気シールド材よりなり、下部が 略円柱状に形成され上部が平板状に形成される。Inside the container 1, a holding member 4 and an actuating member 5 are provided laterally with their outer peripheral edges sandwiched inside the fitting protrusion 3a of the lower casing 3, and the inside of the container 1 is accommodated with the negative pressure chamber 1a. It is divided into a chamber 1b. The holding member 4 is made of a synthetic resin and has a disk-shaped bottom wall having an opening in the center and a cylindrical side wall 3a standing on the bottom wall, and a notch 4b is formed in the side wall 4a. Inside the side wall 4a of the holding member 4, a Hall IC 6 composed of a Hall element and a control circuit which operates by the rise of a magnetic field of a single polarity is arranged by fitting one side into the notch 4b and further The magnet 7 is disposed with one pole facing the Hall IC 6 and at a position where the magnetic field rises, that is, a position where a magnetic flux density causing a sudden voltage rise acts on the Hall element. The holding member may have a pair of plate-shaped side walls standing upright with a disc-shaped bottom wall provided with an opening sandwiching the opening. One side of the Hall IC 6 is connected to a rod body 8 suspended from the upper wall of the upper casing 2. The rod body 8 has a screw portion 8a formed at the upper end for adjusting the position of the hole IC6 by moving the rod body 8 up and down. The actuating member 5 is composed of a diaphragm 9 and a retainer 10. The diaphragm 9 has a substantially thin disk shape, and is stacked on a metal-made substantially plate-shaped retainer 10 and their centers are riveted. A guide edge 10 a is provided at the open end of the retainer 10. A shielding plate 11 integrated with the rivet is erected on the diaphragm 9. The shield plate 11 is made of metal such as iron, nickel and cobalt, or a magnetic shield material such as synthetic resin in which powder of these metals is kneaded. The lower part is formed in a substantially cylindrical shape and the upper part is formed in a flat plate shape.
【0010】 容器1の負圧室1aには、作動部材5のリテーナ10ガイド縁10aが下ケー シング3に挿入され、下ケーシング3底壁とリテーナ10間にコイル状のスプリ ング12が縮設される。これにより、作動部材5は保持部材4に付勢され、収納 室1bでは遮へい板11が保持部材4の開口から側壁4a内に挿通されて上部が ホールIC6と永久磁石7との間に割込む状態に位置する。In the negative pressure chamber 1 a of the container 1, the retainer 10 guide edge 10 a of the operating member 5 is inserted into the lower casing 3, and the coiled spring 12 is contracted between the bottom wall of the lower casing 3 and the retainer 10. To be done. As a result, the actuating member 5 is urged by the holding member 4, and in the storage chamber 1b, the shield plate 11 is inserted from the opening of the holding member 4 into the side wall 4a and the upper portion is cut between the Hall IC 6 and the permanent magnet 7. Located in the state.
【0011】 ホールIC6は電源端子、出力端子および接知端子を有し、電源端子と出力端 子は上ケーシング2の接続体14、14に各々接続され、接地端子は下ケーシン グ3に接続される。The Hall IC 6 has a power supply terminal, an output terminal and a contact terminal. The power supply terminal and the output terminal are connected to the connecting bodies 14 and 14 of the upper casing 2, respectively, and the ground terminal is connected to the lower casing 3. It
【0012】 ホールICと永久磁石は、上ケーシング内壁にそれぞれ内方に突出する板状の 保持壁を対向させて形成し、それらの対向する壁面に配設したり、また、上ケー シーング上壁から二本の棒体を対向させて垂下させそれらの下端に連結して配設 してもよい。この場合、保持部材は中央に開口を設けた円板状のものとなる。The Hall IC and the permanent magnet are formed by forming plate-like holding walls projecting inwardly on the inner wall of the upper casing so as to face each other, and disposing them on the wall surfaces facing each other, or the upper casing upper wall. It is also possible to arrange two rods so that they face each other and hang down so as to be connected to their lower ends. In this case, the holding member is a disc-shaped member having an opening at the center.
【0013】 これら目詰まり検知装置は、図示しない内燃機関のエアクリーナの出口管に連 通管3bが連通され、さらに接続体14、14に電源と報知ランプとからなる報 知手段(図示せず)が接続される。目詰まり検知装置の負圧室1aには内燃機関 に吸入される空気によって生ずる負圧が伝えられ、エアクリーナ内のフィルタが 吸入空気中の塵を捕捉して出口管側の負圧が増加し負圧室1a内の負圧が所定値 以上になれば、作動部材5にはスプリング12の付勢力より大きな負圧が作用し 作動部材5が下降する。同時に、作動部材5に立設された遮へい板11も下方に 下り、ホールIC6と永久磁石7間には磁界を遮るものがなくなり、永久磁石7 の磁界はホール素子の作動磁束密度のまま到達する。この時、遮へい板11の上 部端が磁束を斜めに横切って遮へいしても図3の模式図のように左側半分の遮へ いされる磁束に相当する右半分の磁束がホールIC6に到達し、遮へい板11が 垂直に下降した場合(二点と鎖線)と、同程度の磁束密度が得られる。従って、 負圧室1a内の負圧が所定値になればホールIC6には必らず大きな電圧が生じ 、報知ランプが点灯される。In these clogging detection devices, a communication pipe 3b is connected to an outlet pipe of an air cleaner of an internal combustion engine (not shown), and further, a connection means (not shown) including a power source and a notification lamp is connected to the connection bodies 14, 14. Are connected. The negative pressure generated by the air sucked into the internal combustion engine is transmitted to the negative pressure chamber 1a of the clogging detection device, and the filter in the air cleaner traps the dust in the intake air, increasing the negative pressure on the outlet pipe side and increasing the negative pressure. When the negative pressure in the pressure chamber 1a becomes equal to or higher than a predetermined value, a negative pressure larger than the urging force of the spring 12 acts on the operating member 5 and the operating member 5 descends. At the same time, the shield plate 11 provided upright on the actuating member 5 also descends downward so that there is no obstruction of the magnetic field between the Hall IC 6 and the permanent magnet 7, and the magnetic field of the permanent magnet 7 reaches the operating magnetic flux density of the Hall element as it is. . At this time, even if the upper end of the shield plate 11 crosses the magnetic flux diagonally to shield, the right half magnetic flux corresponding to the left half shielded magnetic flux reaches the Hall IC 6 as shown in the schematic diagram of FIG. However, when the shield plate 11 descends vertically (two points and a chain line), the same magnetic flux density is obtained. Therefore, when the negative pressure in the negative pressure chamber 1a reaches a predetermined value, a large voltage is inevitably generated in the Hall IC 6 and the notification lamp is turned on.
【0014】 考案の目詰まり検知装置は、上記エアクリーナの出口管への装着の他、空調設 備の空気ろ過器や車用空気清浄器等、負圧室内の圧力が大気圧より下る場所への 装着によってもフィルタの目詰まりが検知される。The clogging detection device of the present invention is mounted on the outlet pipe of the air cleaner, and is installed in a place where the pressure in the negative pressure chamber falls below atmospheric pressure, such as an air filter of an air conditioner or an air purifier for a vehicle. The clogging of the filter can also be detected by mounting.
【0015】[0015]
以上のように、本考案の目詰まり検知装置は、容器内を作動部材で負圧室と収 納室に区画し、収納室内に保持部材を横設しその側壁ホールICと永久磁石とを 対向させて配設し、作動部材に遮へい板を立設してホールICと永久磁石との間 に位置させたので、負圧室内に所定値に相当する負圧が加わり作動部材が下降し 同時に永久磁石の磁界を遮っていた遮へい板も垂直もしくは斜めに下りホールI Cに永久磁石の磁界が到達する。この時、遮へい板の垂直下降を含むいかなる下 降状態に対しても、ホールICには一様に急激な電圧上昇を生ずる磁束密度が作 用する。従って、負圧室内に所定の負圧が伝われば必らずホールICの出力端子 と接地端子間には大きな電圧が生じ、例えばエアクリーナに本目詰まり検知装置 を装着すれば、正規のフィルタの目詰まり状態を検知して報知し、誤報知を回避 する。 As described above, in the clogging detection device of the present invention, the inside of the container is divided into the negative pressure chamber and the storage chamber by the operating member, and the holding member is provided horizontally in the storage chamber so that the side wall hole IC and the permanent magnet face each other. Since the operating member is provided with a shield plate standing upright and positioned between the Hall IC and the permanent magnet, a negative pressure corresponding to a predetermined value is applied to the negative pressure chamber and the operating member descends at the same time. The shield plate that has blocked the magnetic field of the magnet vertically or obliquely also reaches the hall I C by the magnetic field of the permanent magnet. At this time, the magnetic flux density that uniformly causes a rapid voltage rise is applied to the Hall IC regardless of any descending state including the vertical descending of the shield plate. Therefore, if a predetermined negative pressure is transmitted to the negative pressure chamber, a large voltage is inevitably generated between the output terminal and the ground terminal of the Hall IC. For example, if the clogging detection device is installed in the air cleaner, the clogging of the regular filter will occur. It detects the condition and notifies it to avoid false notification.
【図1】本考案の実施例を示す目詰まり検知装置の図で
ある。FIG. 1 is a diagram of a clogging detection device according to an embodiment of the present invention.
【図2】従来の目詰まり検知装置の図である。FIG. 2 is a diagram of a conventional clogging detection device.
【図3】磁束の遮へい状態を示す模式図である。FIG. 3 is a schematic diagram showing a shielding state of magnetic flux.
1 容器 1a 負圧室 1b 収納室 5 作動部材 6 ホールIC 7 永久磁石 11 遮へい板 12 スプリング 1 Container 1a Negative Pressure Chamber 1b Storage Chamber 5 Operating Member 6 Hall IC 7 Permanent Magnet 11 Shield Plate 12 Spring
Claims (1)
なる作動部材で負圧室と収納室とに区画され、収納室内
に、ホール素子と制御回路とからなるホールICと永久
磁石とが対向してそれぞれ配設され、さらに負圧室底壁
と前記作動部材との間にスプリングが縮設され、遮へい
板がホールICと永久磁石との間に位置するように作動
部材に立設された目詰まり検知装置。1. An inside of the container is partitioned into a negative pressure chamber and a storage chamber by an operating member composed of a diaphragm and a retainer, and a Hall IC including a Hall element and a control circuit and a permanent magnet face each other in the storage chamber. Clogs that are respectively arranged, a spring is contracted between the bottom wall of the negative pressure chamber and the operating member, and a shielding plate is erected on the operating member so as to be located between the Hall IC and the permanent magnet. Detection device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2171993U JPH0672623U (en) | 1993-03-31 | 1993-03-31 | Clogging detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2171993U JPH0672623U (en) | 1993-03-31 | 1993-03-31 | Clogging detection device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0672623U true JPH0672623U (en) | 1994-10-11 |
Family
ID=12062894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2171993U Pending JPH0672623U (en) | 1993-03-31 | 1993-03-31 | Clogging detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0672623U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005043119A (en) * | 2003-07-24 | 2005-02-17 | Honda Motor Co Ltd | Pressure detector/indicator and clogging detector using same pressure detector/indicator |
JP2019219316A (en) * | 2018-06-21 | 2019-12-26 | 和興フィルタテクノロジー株式会社 | Filter differential pressure detection device |
-
1993
- 1993-03-31 JP JP2171993U patent/JPH0672623U/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005043119A (en) * | 2003-07-24 | 2005-02-17 | Honda Motor Co Ltd | Pressure detector/indicator and clogging detector using same pressure detector/indicator |
JP2019219316A (en) * | 2018-06-21 | 2019-12-26 | 和興フィルタテクノロジー株式会社 | Filter differential pressure detection device |
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