JP4622798B2 - Spray distribution measuring device - Google Patents

Spray distribution measuring device Download PDF

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JP4622798B2
JP4622798B2 JP2005296680A JP2005296680A JP4622798B2 JP 4622798 B2 JP4622798 B2 JP 4622798B2 JP 2005296680 A JP2005296680 A JP 2005296680A JP 2005296680 A JP2005296680 A JP 2005296680A JP 4622798 B2 JP4622798 B2 JP 4622798B2
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spray
receiving
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啓 宮▲崎▼
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Nissan Motor Co Ltd
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Description

本発明は、液体を霧状に噴射する噴霧器からの噴霧の分布状態を測定する噴霧分布測定装置に関し、詳しくは、負圧雰囲気場または加圧雰囲気場における前記噴霧器からの噴霧の分布状態を高精度、且つ短時間で測定できる装置に関する。   The present invention relates to a spray distribution measuring device that measures the distribution state of a spray from a sprayer that injects liquid in the form of a mist. Specifically, the distribution state of the spray from the sprayer in a negative pressure atmosphere field or a pressurized atmosphere field is increased. The present invention relates to an apparatus that can measure with accuracy and in a short time.

従来から、ガソリンなどの燃料を霧状に噴射するインジェクタの噴射特性を解析するために、インジェクタから噴射された噴霧の分布状態を測定する装置があった。
このような噴霧分布測定装置として、例えば下向きに取り付けられたインジェクタの下方に、複数に分割された計量用の升を設置し、これら複数の分割升の基準面から測定時における液面までのヘッド圧を圧力センサでそれぞれ計測することで、各分割升に溜まった燃料の量を計測し、インジェクタからの噴霧の分布状態を測定するものがあった（特許文献１参照）。 Conventionally, in order to analyze the injection characteristics of an injector that injects fuel such as gasoline in the form of a mist, there has been a device that measures the distribution state of the spray injected from the injector.
As such a spray distribution measuring device, for example, a measuring rod divided into a plurality of parts is installed below an injector attached downward, and a head from the reference surface of the plurality of divided rods to the liquid level at the time of measurement. By measuring the pressure with a pressure sensor, the amount of fuel accumulated in each divided soot is measured, and the distribution state of the spray from the injector is measured (see Patent Document 1).

また、他の噴霧分布測定装置として、噴霧器の噴霧の分布状態を測定する測定板上に二次元的に配列された測定孔の形状を逆錐形状とし、各測定孔の出口に電熱体を設けたものがあった。この噴霧分布測定装置は、各測定孔に設けられた電熱体に一定電圧を印加した状態の測定板に向けて噴霧器から液体を噴射し、各測定孔の錐面を流下して出口から流れ出る噴霧粒子を電熱体で加熱し、各電熱体に流れる電流値を検出することにより、噴霧器から噴射した噴霧粒子の流量の二次元分布を測定するものであった（特許文献２参照）。
特開平４−３５０３５９号公報 特開平１０−５４８１９号公報 In addition, as another spray distribution measuring device, the shape of the measurement holes arranged two-dimensionally on the measurement plate for measuring the spray distribution state of the sprayer is an inverted cone shape, and an electric heater is provided at the outlet of each measurement hole. There was something. This spray distribution measuring device sprays liquid from a sprayer toward a measurement plate in a state where a constant voltage is applied to an electric heater provided in each measurement hole, and sprays flowing down from a conical surface of each measurement hole and flowing out from an outlet. The two-dimensional distribution of the flow rate of the spray particles sprayed from the sprayer was measured by heating the particles with an electric heater and detecting the value of the current flowing through each electric heater (see Patent Document 2).
JP-A-4-350359 Japanese Patent Laid-Open No. 10-54819

しかしながら、上記特許文献１に記載の噴霧分布測定装置においては、分割升に溜まった燃料の量を圧力センサで計測していたので、分割升を設置する雰囲気場の圧力を一定としなければならず、通常は、大気中に設置されていた。また、インジェクタ及び分割升を含む計測系が気密状態となっておらず、シリンダ内における実際の加圧状態または負圧状態を再現した状態で、インジェクタの噴霧の分布状態を測定することはできなかった。そして、この噴霧分布測定装置は、各分割升に溜まった液体の量を一つの圧力センサで順次計測するようになっていたので、全ての分割升内の液体の量を計測するのに長時間がかかっていた。そのため、揮発性の高い燃料の場合は、分割升に溜まった燃料が計測中に蒸発することがあり、精度の高い測定ができないという問題点があった。   However, in the spray distribution measuring apparatus described in Patent Document 1, since the amount of fuel accumulated in the divided soot is measured by the pressure sensor, the pressure in the atmosphere field where the divided soot is installed must be constant. Usually, it was installed in the atmosphere. In addition, the measurement system including the injector and the split rod is not in an airtight state, and the spray distribution state of the injector cannot be measured in a state where the actual pressurized state or negative pressure state in the cylinder is reproduced. It was. And this spray distribution measuring device is designed to measure the amount of liquid accumulated in each divided tub sequentially with one pressure sensor, so it takes a long time to measure the amount of liquid in all the divided tubs. It was over. Therefore, in the case of highly volatile fuel, there is a problem that the fuel accumulated in the divided soot may evaporate during measurement, and measurement with high accuracy cannot be performed.

また、上記特許文献２に記載の噴霧分布測定装置においては、測定板上の測定孔が逆錐形状に形成されており、この測定孔の出口の開口面積が狭かった。そのため、噴霧器から噴射された噴霧を吸引するために測定孔の出口側を減圧しても、測定板に向けて噴射した噴霧が錐面に当たって巻き上がり、液滴が適切な測定孔で捕獲されないことがあった。この場合は、噴霧粒子の二次元分布を正確に測定できなかった。   Further, in the spray distribution measuring apparatus described in Patent Document 2, the measurement hole on the measurement plate is formed in an inverted cone shape, and the opening area of the outlet of the measurement hole is small. Therefore, even if the outlet side of the measurement hole is depressurized in order to suck the spray sprayed from the sprayer, the spray sprayed toward the measurement plate hits the conical surface and rolls up, and the droplets are not captured by the appropriate measurement hole. was there. In this case, the two-dimensional distribution of spray particles could not be measured accurately.

そこで、本発明は、このような問題点に対処し、液体を霧状に噴射する噴霧器からの噴霧の分布状態を測定する噴霧分布測定装置において、負圧雰囲気場または加圧雰囲気場における前記噴霧器の噴霧の分布状態を高精度に測定できる噴霧分布測定装置を提供することを目的とする。   Accordingly, the present invention addresses such problems and provides a spray distribution measuring device for measuring the distribution state of a spray from a sprayer that injects a liquid in the form of a mist in the negative pressure atmosphere field or the pressurized atmosphere field. An object of the present invention is to provide a spray distribution measuring apparatus capable of measuring the spray distribution state with high accuracy.

本発明に係る噴霧分布測定装置は、液体を霧状に噴射する噴霧器及びこの噴霧器からの噴霧を受け止める複数の受け止めセルを内部圧力を調整可能な圧力チャンバ内に収容し、噴霧器が噴射中に圧力ポンプを作動させて、この受け止めセルで受けた液体及び圧力チャンバ内の気体を計測セル側に導いて、気液分離器で液体と気体とを分離して気体を排出し、計測セルに導かれた液面高さを計測して前記噴霧器からの噴霧の分布状態を測定するものである。 The spray distribution measuring apparatus according to the present invention accommodates a sprayer for spraying liquid in a mist state and a plurality of receiving cells for receiving spray from the sprayer in a pressure chamber capable of adjusting the internal pressure, and the sprayer is pressurized during spraying. The pump is operated , the liquid received in the receiving cell and the gas in the pressure chamber are led to the measuring cell side, the liquid and the gas are separated by the gas-liquid separator, the gas is discharged, and the gas is led to the measuring cell. The liquid level height is measured to measure the distribution state of the spray from the sprayer.

本発明によれば、噴霧器及び受け止めセルを収容する圧力チャンバの内部圧力を調整することにより、各受け止めセルで受けた液体が適度に負圧吸引、または漏れ出るようになり、噴霧器から噴射された噴霧が巻き上がるのを抑制し、各受け止めセルでの捕獲率を向上することができる。このため大気圧環境以外にも噴射雰囲気場の圧力を負圧状態から加圧状態まで再現した状態で、噴霧器の噴霧の分布状態を高精度に測定することができる。 According to the present invention, by adjusting the internal pressure of the pressure chamber containing the nebulizer and the receiving cell, the liquid received in each receiving cell is appropriately sucked out or leaked out and sprayed from the nebulizer. It is possible to suppress the spray from rolling up and improve the capture rate in each receiving cell. For this reason , the spray distribution state of the sprayer can be measured with high accuracy in a state where the pressure in the injection atmosphere field is reproduced from the negative pressure state to the pressurized state in addition to the atmospheric pressure environment.

以下、本発明の実施形態を添付図面に基づいて詳細に説明する。
図１は本発明による噴霧分布測定装置を示す概略図であり、図２は噴霧分布測定装置の実施形態を示す正面図である。この噴霧分布測定装置は、燃料を霧状に噴射するインジェクタの噴射特性を解析するために、インジェクタから噴射された噴霧の分布状態を測定する装置であって、図１に示すように、インジェクタ１と、受け止めセル２と、圧力チャンバ３と、計測セル４と、定油面タンク５と、ＣＣＤカメラ６とを備えて成る。 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view showing a spray distribution measuring apparatus according to the present invention, and FIG. 2 is a front view showing an embodiment of the spray distribution measuring apparatus. This spray distribution measuring device is a device that measures the distribution state of spray injected from an injector in order to analyze the injection characteristics of an injector that injects fuel in the form of a mist. As shown in FIG. And a receiving cell 2, a pressure chamber 3, a measuring cell 4, a constant oil level tank 5, and a CCD camera 6.

インジェクタ１は、液体燃料を細かい霧状に噴射する噴霧器であって、用途に応じて多くの種類のものがある。このインジェクタ１は、下向きに取り付けられており、このインジェクタ１が燃料７を噴射する方向には、複数個の受け止めセル２，２，…が並べて配置されている。
この受け止めセル２は、インジェクタ１から噴射された燃料７の噴霧を受け止める角型の筒状部材であって、その開口部の形状は例えば正方形とされている。なお、受け止めセル２の大きさは、例えば開口部の１辺が６ｍｍ程度の長さとされ、噴霧された燃料７を溜めておくのに十分な深さとされている。 The injector 1 is a sprayer that injects liquid fuel into a fine mist, and there are many types depending on the application. The injector 1 is attached downward, and a plurality of receiving cells 2, 2,... Are arranged side by side in the direction in which the injector 1 injects fuel 7.
The receiving cell 2 is a rectangular cylindrical member that receives the spray of the fuel 7 injected from the injector 1, and the shape of the opening thereof is, for example, a square. Note that the size of the receiving cell 2 is, for example, a length of about 6 mm on one side of the opening, and is deep enough to store the sprayed fuel 7.

この受け止めセル２は、図３に示すように、例えば縦に１６個、横に１６個並べて配置されている。この合計２５６個の受け止めセル２が配置された中心付近における領域Ａの内側は、インジェクタ１からの噴霧量が最も多い範囲となり、その外側の領域Ｂは噴霧量が少なく、その外側の領域Ｃでは噴霧量がさらに少なくなる。そして、本実施形態では、領域Ｃの内側に配置された縦１０個、横１６個の受け止めセル２が噴霧量の計測に用いられ、領域Ｃの外側は不使用範囲とする。なお、図１には、図３に示す領域Ａ，Ｂ，Ｃを横切る例えば第８列目の受け止めセル２の列が示されている。   As shown in FIG. 3, the receiving cells 2 are arranged, for example, 16 vertically and 16 horizontally. The inside of the area A in the vicinity of the center where the total of 256 receiving cells 2 are arranged is the area where the spray amount from the injector 1 is the largest, the outside area B is small and the outside area C is in the outside area C. The spray amount is further reduced. In the present embodiment, 10 vertical and 16 horizontal receiving cells 2 arranged inside the region C are used for the measurement of the spray amount, and the outside of the region C is a non-use range. FIG. 1 shows, for example, a column of receiving cells 2 in the eighth column crossing the regions A, B, and C shown in FIG.

このように配置された受け止めセル２は、図２に示す昇降装置１７によって上下動するようになっている。これにより、図１に示すように、インジェクタ１の噴射口から受け止めセル２の上面までの距離Ｌを任意の長さに設定できる。よって、この距離Ｌを適宜設定することで、インジェクタ１から噴射される噴霧が飛散する噴射範囲を調整できるので、どのような噴射特性のインジェクタ１にも適用することができる。   The receiving cells 2 arranged in this manner are moved up and down by an elevating device 17 shown in FIG. Thereby, as shown in FIG. 1, the distance L from the injection port of the injector 1 to the upper surface of the receiving cell 2 can be set to arbitrary length. Therefore, by appropriately setting the distance L, the injection range in which the spray injected from the injector 1 is scattered can be adjusted, and therefore, the present invention can be applied to the injector 1 having any injection characteristic.

このようなインジェクタ１及び受け止めセル２は、圧力チャンバ３の中に収容されている。この圧力チャンバ３は、エンジンのインジェクタ取付け部位の内圧を想定してインジェクタ１の噴射雰囲気場を再現するもので、例えばその上面には大気連通管８が取り付けられている。この大気連通管８は、圧力チャンバ３と連通して気体の流路となるもので、その途中に開閉弁９が設けられている。また、圧力チャンバ３には、その内部に不活性ガスである窒素ガスを供給する加圧ポンプ１０が接続されている。これにより、加圧ポンプ１０を作動して圧力チャンバ３内に不活性ガスを供給したり、あるいは圧力チャンバ３内の気体を後述する負圧ポンプ１１で吸引できるようになっている。そして、開閉弁９を開閉制御することで、圧力チャンバ３の内部圧力を調整することができる。このように、大気圧環境以外にも噴射雰囲気場の圧力を負圧状態から加圧状態まで任意に設定することができる。   Such an injector 1 and a receiving cell 2 are accommodated in a pressure chamber 3. The pressure chamber 3 reproduces the injection atmosphere field of the injector 1 assuming the internal pressure of the injector mounting portion of the engine. For example, an air communication pipe 8 is attached to the upper surface of the pressure chamber 3. The atmospheric communication pipe 8 is a gas flow path that communicates with the pressure chamber 3, and an open / close valve 9 is provided in the middle thereof. The pressure chamber 3 is connected to a pressure pump 10 for supplying nitrogen gas as an inert gas. As a result, the pressurizing pump 10 is operated to supply an inert gas into the pressure chamber 3, or the gas in the pressure chamber 3 can be sucked by a negative pressure pump 11 described later. The internal pressure of the pressure chamber 3 can be adjusted by controlling the opening / closing of the on / off valve 9. As described above, the pressure in the injection atmosphere field can be arbitrarily set from the negative pressure state to the pressurized state in addition to the atmospheric pressure environment.

また、各受け止めセル２の底部には接続管１２が設けられている。この接続管１２は、受け止めセル２で受けた燃料７又は圧力チャンバ３内の気体の取り出し口となるもので、後述する計測セル４に導く配管１３が接続されている。この接続管１２の長さは、外側に設けられたものより内側に設けられたものの方が徐々に長くなっている。これにより、図１に示すように、各接続管１２に配管１３を接続したときに、各配管１３の先端部に設けられた脱落防止用のフランジ１３ａ同士が重なり合うことがなくなるので、多くの配管１３を容易に接続することができる。   A connecting pipe 12 is provided at the bottom of each receiving cell 2. The connecting pipe 12 serves as a port for taking out the fuel 7 received in the receiving cell 2 or the gas in the pressure chamber 3, and is connected to a pipe 13 that leads to a measuring cell 4 described later. The length of the connecting pipe 12 is gradually longer in the inner pipe than in the outer pipe. As a result, as shown in FIG. 1, when the pipes 13 are connected to the respective connecting pipes 12, the drop-off preventing flanges 13 a provided at the distal ends of the pipes 13 do not overlap each other. 13 can be easily connected.

また、各配管１３の他端部は、複数の計測セル４のうちのいずれかに接続されている。この計測セル４は、各受け止めセル２で受けた燃料７の量を液面高さに変換するものであって、その上面に蓋部４ａが取り付けられている。この蓋部４ａには、受け止めセル２の接続管１２に接続された配管１３を取り付ける１６個の取込口４ｂと、負圧ポンプ１１に接続された排気管１４を取り付ける１６個の排気口４ｃとが形成されている。これらの各取込口４ｂと各排気口４ｃとは、蓋部４ａの内側に形成された１６個の気液分離部４ｄを介して連通している。この気液分離部４ｄは、受け止めセル２から吸引または送り込まれた燃料７と気体とを分離するようになっている。また、各気液分離部４ｄの下部には、それぞれ計測管部４ｅが形成されている。この計測管部４ｅは、取込口４ｂから取り込まれて気液分離部４ｄで分離された燃料７の量を液面高さに変換するもので、ＣＣＤカメラ６で撮像できるように透明な部材で形成されている。   The other end of each pipe 13 is connected to one of the plurality of measurement cells 4. The measuring cell 4 converts the amount of fuel 7 received by each receiving cell 2 into a liquid level, and a lid 4a is attached to the upper surface thereof. In this lid portion 4a, 16 intake ports 4b to which pipes 13 connected to the connection pipes 12 of the receiving cells 2 are attached and 16 exhaust ports 4c to which exhaust pipes 14 connected to the negative pressure pump 11 are attached. And are formed. Each intake port 4b and each exhaust port 4c communicate with each other through 16 gas-liquid separation portions 4d formed inside the lid portion 4a. The gas-liquid separation unit 4d separates the fuel 7 sucked or sent from the receiving cell 2 and the gas. In addition, a measurement tube portion 4e is formed below each gas-liquid separation portion 4d. The measuring tube 4e converts the amount of the fuel 7 taken in from the intake 4b and separated by the gas-liquid separator 4d into a liquid level, and is a transparent member so that it can be imaged by the CCD camera 6. It is formed with.

このように、１６組の取込口４ｂと排気口４ｃと気液分離部４ｄと計測管部４ｅとを備えて構成された計測セル４は、図４に示すように、装置内部の両側壁に沿って５個ずつ並べられている。この両側５個ずつの計測セル４の間には、前後方向に走行可能な撮像装置１８が設置されている。図４中において、右端に設置された計測セル４，４の位置を第１撮像位置Ｓ１とし、その左側に設置された計測セル４，４の位置を第２撮像位置Ｓ２とする。以下、その左側に設置された計測セル４，４の位置から順に第３撮像位置Ｓ３〜第５撮像位置Ｓ５とする。なお、撮像装置１８は、第１撮像位置Ｓ１に設置された計測セル４，４を撮像した後、第２撮像位置Ｓ２〜第５撮像位置Ｓ５に設置された計測セル４を順次撮像するようになっている。   As shown in FIG. 4, the measurement cell 4 including the 16 sets of the intake port 4b, the exhaust port 4c, the gas-liquid separation unit 4d, and the measurement tube unit 4e has both side walls inside the apparatus. 5 are arranged along each line. An imaging device 18 capable of traveling in the front-rear direction is installed between the five measurement cells 4 on both sides. In FIG. 4, the position of the measurement cells 4 and 4 installed at the right end is defined as a first imaging position S1, and the position of the measurement cells 4 and 4 installed on the left side thereof is defined as a second imaging position S2. Hereinafter, the third imaging position S3 to the fifth imaging position S5 are sequentially set from the position of the measurement cells 4 and 4 installed on the left side. In addition, after imaging the measurement cells 4 and 4 installed in the first imaging position S1, the imaging device 18 sequentially captures the measurement cells 4 installed in the second imaging position S2 to the fifth imaging position S5. It has become.

そして、上記のように、本実施形態では、図３に示す領域Ｃの内側が噴霧量の計測に用いられる範囲であるので、この領域Ｃの内側に配置された１６０個の受け止めセル２が、それぞれ所定の計測セル４に接続されている。例えば、図３に示す領域Ａ内に配置された受け止めセル２が、図４に示す第１撮像位置Ｓ１に設置された計測セル４に接続され、領域Ｂ内に配置された受け止めセル２に対応するものが、第２撮像位置Ｓ２〜第３撮像位置Ｓ３に設置された計測セル４に接続され、領域Ｃ内に配置された受け止めセル２に対応するものが、第４撮像位置Ｓ４〜第５撮像位置Ｓ５に設置された計測セル４に接続されている。   And as mentioned above, in this embodiment, since the inside of the area C shown in FIG. 3 is a range used for the measurement of the spray amount, 160 receiving cells 2 arranged inside this area C are Each is connected to a predetermined measurement cell 4. For example, the receiving cell 2 arranged in the region A shown in FIG. 3 is connected to the measuring cell 4 installed in the first imaging position S1 shown in FIG. 4 and corresponds to the receiving cell 2 arranged in the region B. What is to be connected to the measurement cell 4 installed in the second imaging position S2 to the third imaging position S3 and corresponding to the receiving cell 2 arranged in the area C is the fourth imaging position S4 to fifth. It is connected to the measurement cell 4 installed at the imaging position S5.

また、図１に示す計測セル４の底部には、排液管１５及び油面調整弁１６を介して定油面タンク５が接続されている。この定油面タンク５は、計測セル４内の計測液面を初期化するのに必要な定油面を確保するための燃料７を収容しておく容器である。この定油面タンク５には、計測セル４に導かれた燃料７が廃棄されるようになっており、この廃棄された燃料７はインジェクタ１に再度供給できるようになっている。   A constant oil level tank 5 is connected to the bottom of the measurement cell 4 shown in FIG. 1 via a drainage pipe 15 and an oil level adjustment valve 16. The constant oil level tank 5 is a container for storing a fuel 7 for securing a constant oil level necessary for initializing the measurement liquid level in the measurement cell 4. The constant oil level tank 5 is configured such that the fuel 7 guided to the measurement cell 4 is discarded, and the discarded fuel 7 can be supplied to the injector 1 again.

図５は、左右両側の計測セル４，４の液面の高さを計測する撮像装置１８を示す平面図である。この撮像装置１８は、第１撮像位置Ｓ１〜第５撮像位置Ｓ５に設置された計測セル４，４に沿って走行するようになっており、ロボットアーム１９の基台の左右両側に２台のＣＣＤカメラ６を備えている。この撮像装置１８は、左右２台のＣＣＤカメラ６，６によって第１撮像位置Ｓ１に設置された両側の計測セル４，４を同時に撮像した後で、第２撮像位置Ｓ２〜第５撮像位置Ｓ５に設置された計測セル４を順次に撮像するようになっている。これにより、図１に示すように、各計測セル４に導かれた燃料７の液面高さｈがＣＣＤカメラ６で撮像され、受け止めセル２で受けた燃料７の量を計測することができる。なお、本実施形態では、図５に示すように、各ＣＣＤカメラ６は、ミラー２０に映った計測セル４の計測セル４を撮像するようになっている。   FIG. 5 is a plan view showing the imaging device 18 that measures the height of the liquid level of the measurement cells 4 and 4 on the left and right sides. The imaging device 18 travels along the measurement cells 4 and 4 installed at the first imaging position S1 to the fifth imaging position S5. Two imaging devices 18 are provided on both the left and right sides of the base of the robot arm 19. A CCD camera 6 is provided. The imaging device 18 simultaneously images the measurement cells 4 and 4 on both sides installed at the first imaging position S1 by the two right and left CCD cameras 6 and 6, and then the second imaging position S2 to the fifth imaging position S5. The measurement cells 4 installed in are sequentially imaged. Thereby, as shown in FIG. 1, the liquid level height h of the fuel 7 guided to each measurement cell 4 is imaged by the CCD camera 6, and the amount of the fuel 7 received by the receiving cell 2 can be measured. . In the present embodiment, as shown in FIG. 5, each CCD camera 6 images the measurement cell 4 of the measurement cell 4 reflected on the mirror 20.

次に、このように構成された噴霧分布測定装置の動作について、図１を参照して説明する。まず、初期状態において、排液管１５に設けられた油面調整弁１６開くと、各計測セル４の計測管４ｅと定油面タンク５とが排液管１５を介して連通し、計測セル４内の液面の高さが基準位置に合わせられる。
続いて、図４に示すように、撮像装置１８が走行して第１撮像位置Ｓ１に配置された計測セル４，４の前の定位置でロボットアーム１９が停止し、２台のＣＣＤカメラ６で初期油面の画像情報を撮像した後、第２撮像位置Ｓ２〜第５撮像位置Ｓ５に配置された計測セル４の初期油面の画像情報を順次撮像して破線で示す基点位置まで戻る。図示省略のモニタに表示された各計測セル４内の液面を目視確認し、液面の高さが揃っていなければ、繰り返し定油面出し作業を行う。 Next, the operation of the spray distribution measuring apparatus configured as described above will be described with reference to FIG. First, in the initial state, when the oil level adjustment valve 16 provided in the drainage pipe 15 is opened, the measurement pipe 4e of each measurement cell 4 and the constant oil level tank 5 communicate with each other via the drainage pipe 15. The height of the liquid level in 4 is adjusted to the reference position.
Subsequently, as shown in FIG. 4, the imaging device 18 travels and the robot arm 19 stops at a fixed position in front of the measurement cells 4 and 4 arranged at the first imaging position S1, and the two CCD cameras 6 are moved. Then, after image information of the initial oil level is captured, the image information of the initial oil level of the measurement cells 4 arranged at the second imaging position S2 to the fifth imaging position S5 is sequentially captured and returned to the base position indicated by the broken line. The liquid level in each measurement cell 4 displayed on a monitor (not shown) is visually confirmed. If the liquid level is not uniform, the constant oil leveling operation is repeated.

ここで、例えば負圧雰囲気場におけるインジェクタ１の噴霧の分布状態を測定する場合には、負圧ポンプ１１を作動する。これにより、圧力チャンバ３内の気体は、受け止めセル２及び接続管１２を通過し、配管１３、計測セル４、排気管１４介して負圧ポンプ１１の排気口１１ａから排出され、圧力チャンバ３の内部が負圧状態となる。
この状態で、昇降装置１７を上下動してインジェクタ１の噴射口から受け止めセル２の上面までの距離Ｌを調整し、図３に示す領域Ｃの内側に燃料７が噴射されるようにする。このインジェクタ１から所定の時間、所定のインターバル又は噴射回数で燃料７を噴射させる。このとき、負圧ポンプ１１が作動しているので、受け止めセル２内で受けた燃料７が負圧吸引されて計測セル４に導かれる。このとき、計測セル４に導かれた燃料７は、気液分離部４ｄの斜面により流下して計測管部４ｅ側に溜まり、同時に吸引された気体のみが負圧ポンプ１１の排気口１１ａから排出する。このとき、圧力チャンバ３の内圧は、開閉弁９を開閉制御することで、一定の負圧状態に調整される。 Here, for example, when measuring the spray distribution state of the injector 1 in a negative pressure atmosphere field, the negative pressure pump 11 is operated. As a result, the gas in the pressure chamber 3 passes through the receiving cell 2 and the connection pipe 12, is discharged from the exhaust port 11 a of the negative pressure pump 11 through the pipe 13, the measurement cell 4, and the exhaust pipe 14. The inside is in a negative pressure state.
In this state, the elevating device 17 is moved up and down to adjust the distance L from the injection port of the injector 1 to the upper surface of the receiving cell 2 so that the fuel 7 is injected inside the region C shown in FIG. The fuel 7 is injected from the injector 1 at a predetermined time, a predetermined interval, or the number of injections. At this time, since the negative pressure pump 11 is operating, the fuel 7 received in the receiving cell 2 is sucked into the negative pressure and guided to the measuring cell 4. At this time, the fuel 7 guided to the measurement cell 4 flows down by the slope of the gas-liquid separator 4d and accumulates on the measurement tube 4e side, and only the gas sucked at the same time is discharged from the exhaust port 11a of the negative pressure pump 11. To do. At this time, the internal pressure of the pressure chamber 3 is adjusted to a constant negative pressure state by controlling the opening / closing valve 9 to open and close.

一方、加圧雰囲気場におけるインジェクタ１の噴霧の分布状態を測定する場合には、負圧ポンプ１１の代わりに加圧ポンプ１０を作動して、圧力チャンバ３の内部に高圧の窒素ガスを送り込み、この窒素ガスを受け止めセル２及び計測セル４を介して負圧ポンプ１１の排気口１１ａから放出する。この状態で、上記のように、インジェクタ１から燃料７を噴射する。圧力チャンバ３の内部は、加圧状態となっているので、インジェクタ１から噴射されて受け止めセル２で受けた燃料７は、接続管１２から漏れ出し、計測セル４に導かれる。このとき、計測セル４に導かれた燃料７は、気液分離部４ｄの斜面により流下して計測管部４ｅ側に溜まり、同時に漏れ出た気体のみが負圧ポンプ１１の排気口１１ａから排出する。このとき、圧力チャンバ３の内圧は、開閉弁９を開閉制御することで、一定の加圧状態に調整される。   On the other hand, when measuring the spray distribution state of the injector 1 in the pressurized atmosphere field, the pressurized pump 10 is operated instead of the negative pressure pump 11 to send high-pressure nitrogen gas into the pressure chamber 3. The nitrogen gas is received and discharged from the exhaust port 11 a of the negative pressure pump 11 through the cell 2 and the measurement cell 4. In this state, the fuel 7 is injected from the injector 1 as described above. Since the inside of the pressure chamber 3 is in a pressurized state, the fuel 7 injected from the injector 1 and received by the receiving cell 2 leaks from the connecting pipe 12 and is guided to the measuring cell 4. At this time, the fuel 7 guided to the measurement cell 4 flows down by the slope of the gas-liquid separation part 4d and accumulates on the measurement pipe part 4e side, and only the leaked gas is discharged from the exhaust port 11a of the negative pressure pump 11 at the same time. To do. At this time, the internal pressure of the pressure chamber 3 is adjusted to a constant pressurization state by controlling the on-off valve 9 to open and close.

このように、圧力チャンバ３内の圧力を適切にコントロールすることで、各受け止めセル２で受けた燃料７が適度に負圧吸引、または漏れ出るようになり、インジェクタ１から噴射された噴霧が巻き上がるのを抑制し、各受け止めセル２での捕獲率を向上することができる。
そして、インジェクタ１で燃料７の噴射を開始後、予め設定された数分の待ち時間を経て計測指令を出すと、再び撮像装置１８が破線で示す基点位置から動き出し、上述したと同様に第１撮像位置Ｓ１〜第５撮像位置Ｓ５に設置された計測セル４の前で停止し、定油面から増加した液面の画像を取り込む。 Thus, by appropriately controlling the pressure in the pressure chamber 3, the fuel 7 received in each receiving cell 2 can be appropriately sucked or leaked out, and the spray injected from the injector 1 is wound. It is possible to suppress the rise and improve the capture rate in each receiving cell 2.
Then, after injecting the fuel 7 with the injector 1, when a measurement command is issued after a preset waiting time of several minutes, the imaging device 18 starts to move again from the base position indicated by the broken line, and the first as described above. It stops in front of the measurement cell 4 installed in the imaging position S1 to the fifth imaging position S5, and captures an image of the liquid level increased from the constant oil level.

ここで、上記のように、各受け止めセル２と各計測セル４とは、インジェクタ１の噴霧量が多い領域内に配置された受け止めセル２に接続された計測セル４から優先的に撮像するようになっており、撮像装置１８は数分間で第１撮像位置Ｓ１〜第５撮像位置Ｓ５に設置された計測セル４，４を全て撮像することができるので、計測中における燃料７の蒸発量は少なく、計測誤差を少なくして高精度の計測を行うことができる。   Here, as described above, each receiving cell 2 and each measuring cell 4 are preferentially imaged from the measuring cell 4 connected to the receiving cell 2 arranged in the region where the spray amount of the injector 1 is large. Since the imaging device 18 can image all the measurement cells 4 and 4 installed in the first imaging position S1 to the fifth imaging position S5 in a few minutes, the evaporation amount of the fuel 7 during measurement is Therefore, it is possible to perform measurement with high accuracy while reducing measurement errors.

そして、全ての計測セル４について、初期油面と計測時の油面との高さの差分ｈを算出する。この差分ｈは、例えば図３に示す受け止めセル２の配置に合成して燃料噴射の分布パターンを２Ｄ化、３Ｄ化して図示省略のモニタに表示される。
このように、本発明による噴霧分布測定装置では、受け止めセル２から計測セル４までの計測系が密閉構造となっているので、インジェクタ１から噴射する燃料７はどのような性状のものでもよく、ガソリンのように揮発性の高い燃料７についても高精度に測定することができる。また、定油面合わせ、圧力調整、燃料噴射、計測の一連の作業を行う際、部品の取り外し等の作業が必要ないので、インジェクタ１による噴霧の分布状態を連続的に測定することができる。これらの一連の動作は、数分間という短時間で行うことができるので、同一の条件で繰り返し測定して測定精度の向上を図ることができる。また、圧力チャンバ３の内圧や、インジェクタ１の噴射回数、燃料７の種類等を変更して測定を行うことで、インジェクタ１の噴射特性を多面的に解析することができる。 And about all the measurement cells 4, the height difference h of the initial oil level and the oil level at the time of measurement is calculated. The difference h is combined with the arrangement of the receiving cells 2 shown in FIG. 3, for example, and the fuel injection distribution pattern is converted into 2D or 3D and displayed on a monitor (not shown).
Thus, in the spray distribution measuring apparatus according to the present invention, since the measurement system from the receiving cell 2 to the measurement cell 4 has a sealed structure, the fuel 7 injected from the injector 1 may have any property, Highly volatile fuel 7 such as gasoline can be measured with high accuracy. Further, when performing a series of operations such as constant oil level adjustment, pressure adjustment, fuel injection, and measurement, it is not necessary to remove parts and the like, so that the spray distribution state by the injector 1 can be continuously measured. Since these series of operations can be performed in a short time of several minutes, measurement accuracy can be improved by repeatedly measuring under the same conditions. Further, by changing the internal pressure of the pressure chamber 3, the number of injections of the injector 1, the type of the fuel 7, and the like, the injection characteristics of the injector 1 can be analyzed in a multifaceted manner.

なお、以上の説明は、エンジン用のインジェクタ１の噴霧の分布状態を測定するものとしたが、本発明はこれに限られず、エンジン用の燃料７以外の液体を噴霧する噴射ノズルにも適用することもできる。
以上のように、本実施形態によれば、気液分離器４ｄの気体排出側に、圧力チャンバ３内の気体を吸引する負圧ポンプ１１を備えたことにより、この負圧ポンプ１１を作動して圧力チャンバ３内の気体を吸引することで、この圧力チャンバ３の内圧を負圧状態にすることができる。これにより、受け止めセル２で受けた燃料７が負圧吸引されて計測セル４に導かれ、負圧雰囲気場におけるインジェクタ１の噴霧の分布状態を測定することができる。 In the above description, the spray distribution state of the injector 1 for the engine is measured. However, the present invention is not limited to this, and is applied to an injection nozzle that sprays liquid other than the fuel 7 for the engine. You can also.
As described above, according to the present embodiment, the negative pressure pump 11 that sucks the gas in the pressure chamber 3 is provided on the gas discharge side of the gas-liquid separator 4d. By sucking the gas in the pressure chamber 3, the internal pressure of the pressure chamber 3 can be set to a negative pressure state. As a result, the fuel 7 received by the receiving cell 2 is sucked into the negative pressure and guided to the measuring cell 4, and the spray distribution state of the injector 1 in the negative pressure atmosphere can be measured.

また、本実施形態によれば、圧力チャンバ３に、その内部に気体を供給する加圧ポンプ１０を備えたことにより、この加圧ポンプ１０を作動して圧力チャンバ３内に気体を供給することで、この圧力チャンバ３の内圧を加圧状態にすることができる。これにより、受け止めセル２で受けた燃料７が漏れ出して計測セル４に導かれ、加圧雰囲気場におけるインジェクタ１の噴霧の分布状態を測定することができる。   In addition, according to the present embodiment, the pressure chamber 3 is provided with the pressure pump 10 that supplies gas therein, so that the gas is supplied into the pressure chamber 3 by operating the pressure pump 10. Thus, the internal pressure of the pressure chamber 3 can be brought into a pressurized state. Thereby, the fuel 7 received by the receiving cell 2 leaks and is guided to the measuring cell 4, and the spray distribution state of the injector 1 in the pressurized atmosphere can be measured.

また、本実施形態によれば、圧力チャンバ３に気体の流路となる連通管８を接続し、この連通管８に、圧力チャンバ３の内部圧力を調整する開閉弁９を備えたことにより、この開閉弁９を開閉制御することで、圧力チャンバ３の内部圧力を調整することができる。
また、本実施形態によれば、各計測セル４の液面高さを撮像する撮像手段１８（ＣＣＤカメラ６）を備え、この撮像手段１８は、インジェクタ１からの噴霧量が多い領域内に配置された受け止めセル２に接続された計測セル４から優先的に撮像することにより、測定精度が求められる受け止めセル２に接続された計測セル４から優先的に計測され、蒸発による誤差が少なくなり、高精度の計測を行うことができる。 Further, according to the present embodiment, the communication pipe 8 serving as a gas flow path is connected to the pressure chamber 3, and the communication pipe 8 includes the on-off valve 9 that adjusts the internal pressure of the pressure chamber 3. The internal pressure of the pressure chamber 3 can be adjusted by controlling the open / close valve 9.
Moreover, according to this embodiment, the imaging means 18 (CCD camera 6) which images the liquid level height of each measurement cell 4 is provided, and this imaging means 18 is arrange | positioned in the area | region where the amount of sprays from the injector 1 is large. By preferentially imaging from the measurement cell 4 connected to the received receiving cell 2, the measurement is performed with priority from the measurement cell 4 connected to the receiving cell 2 where measurement accuracy is required, and errors due to evaporation are reduced. High-precision measurement can be performed.

本発明による噴霧分布測定装置を示す概略図である。It is the schematic which shows the spray distribution measuring apparatus by this invention. 本発明による噴霧分布測定装置の実施形態を示す正面図である。It is a front view which shows embodiment of the spray distribution measuring apparatus by this invention. 受け止めセルの配列状態を示す平面図である。It is a top view which shows the arrangement | sequence state of a receiving cell. 噴霧分布測定装置の内部を示す断面図である。It is sectional drawing which shows the inside of a spray distribution measuring apparatus. 計測セル内の液面の高さを計測する撮像装置を示す平面図である。It is a top view which shows the imaging device which measures the height of the liquid level in a measurement cell.

符号の説明Explanation of symbols

１…インジェクタ，２…受け止めセル，３…圧力チャンバ，４…計測セル，４ａ…蓋部，４ｂ…取込口，４ｃ…排気口，４ｄ…気液分離部，４ｅ…計測管部，５…定油面タンク，６…ＣＣＤカメラ，７…燃料，８…大気連通管，９…開閉弁，１０…加圧ポンプ，１１…負圧ポンプ，１２…接続管，１３…配管，１４…排気管，１５…排液管，１６…油面調整弁，１７…昇降装置，１８…撮像装置，１９…ロボットアーム，２０…ミラー   DESCRIPTION OF SYMBOLS 1 ... Injector, 2 ... Receiving cell, 3 ... Pressure chamber, 4 ... Measurement cell, 4a ... Cover part, 4b ... Intake port, 4c ... Exhaust port, 4d ... Gas-liquid separation part, 4e ... Measurement pipe part, 5 ... Constant oil level tank, 6 ... CCD camera, 7 ... Fuel, 8 ... Air communication pipe, 9 ... Open / close valve, 10 ... Pressure pump, 11 ... Negative pressure pump, 12 ... Connection pipe, 13 ... Piping, 14 ... Exhaust pipe , 15 ... drainage pipe, 16 ... oil level control valve, 17 ... lifting device, 18 ... imaging device, 19 ... robot arm, 20 ... mirror

Claims (5)

液体を霧状に噴射する噴霧器からの噴霧を受け止める複数の受け止めセルと、
これら複数の受け止めセルにそれぞれ接続され、各受け止めセルで受けた液体の量を液面高さに変換する複数の計測セルと、
前記噴霧器及び前記受け止めセルを収納し、内部圧力を調整可能な圧力チャンバと、
前記各受け止めセルと前記各計測セルとの各接続経路に配置され、気体と液体とを分離して気体を排出させる気液分離器と、
前記気液分離器の気体排出側に配置され、前記噴霧器が噴射中に作動して前記圧力チャンバ内の気体を吸引する負圧ポンプと、を含んで構成され、
前記各計測セルの液面高さを計測して前記噴霧器からの噴霧の分布状態を測定することを特徴とする噴霧分布測定装置。 A plurality of receiving cells for receiving the spray from the sprayer that sprays the liquid in a mist form;
A plurality of measuring cells connected to the plurality of receiving cells, respectively, for converting the amount of liquid received in each receiving cell into a liquid level;
A pressure chamber accommodating the nebulizer and the receiving cell and capable of adjusting an internal pressure;
A gas-liquid separator that is disposed in each connection path between each of the receiving cells and each of the measurement cells, separates the gas and the liquid, and discharges the gas;
A negative pressure pump that is disposed on the gas discharge side of the gas-liquid separator, and the sprayer operates during injection to suck the gas in the pressure chamber, and
A spray distribution measuring apparatus characterized by measuring the liquid level height of each measurement cell and measuring the distribution state of spray from the sprayer. 液体を霧状に噴射する噴霧器からの噴霧を受け止める複数の受け止めセルと、
これら複数の受け止めセルにそれぞれ接続され、各受け止めセルで受けた液体の量を液面高さに変換する複数の計測セルと、
前記噴霧器及び前記受け止めセルを収納し、内部圧力を調整可能な圧力チャンバと、
前記圧力チャンバに接続され、前記噴霧器が噴射中に作動してその内部に気体を供給する加圧ポンプと、
前記各受け止めセルと前記各計測セルとの各接続経路に配置され、気体と液体とを分離して気体を排出させる気液分離器と、を含んで構成され、
前記各計測セルの液面高さを計測して前記噴霧器からの噴霧の分布状態を測定することを特徴とする噴霧分布測定装置。 A plurality of receiving cells for receiving the spray from the sprayer that sprays the liquid in a mist form;
A plurality of measuring cells connected to the plurality of receiving cells, respectively, for converting the amount of liquid received in each receiving cell into a liquid level;
A pressure chamber accommodating the nebulizer and the receiving cell and capable of adjusting an internal pressure;
A pressure pump connected to the pressure chamber, wherein the atomizer operates during injection to supply gas therein;
A gas-liquid separator that is disposed in each connection path between each of the receiving cells and each of the measurement cells and separates the gas and the liquid and discharges the gas; and
Wherein measuring the distribution of spray mists distribution measuring apparatus you wherein from the sprayer liquid level is measured in each measurement cell. 前記圧力チャンバに気体の流路となる連通管を接続し、
この連通管に、前記圧力チャンバの内部圧力を調整する開閉弁を備えたことを特徴とする請求項１又は２に記載の噴霧分布測定装置。 Connecting a communication pipe serving as a gas flow path to the pressure chamber;
The spray distribution measuring device according to claim 1 or 2 , wherein the communication pipe is provided with an on-off valve for adjusting an internal pressure of the pressure chamber . 前記開閉弁は、前記噴霧器が噴射中に開閉制御されることを特徴とする請求項３に記載の噴霧分布測定装置。 4. The spray distribution measuring apparatus according to claim 3 , wherein the opening / closing valve is controlled to be opened and closed during the spraying of the sprayer. 前記各計測セルの液面高さを撮像する撮像手段を備え、
この撮像手段は、前記噴霧器からの噴霧量が多い領域内に配置された受け止めセルに接続された計測セルから優先的に撮像することを特徴とする請求項１〜４のいずれか１つに記載の噴霧分布測定装置。 Comprising an imaging means for imaging the liquid level of each measurement cell;
5. The imaging device according to claim 1, wherein the imaging unit preferentially captures an image from a measurement cell connected to a receiving cell disposed in a region where a spray amount from the sprayer is large. Spray distribution measuring device.
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JPH11352021A (en) * 1998-06-05 1999-12-24 Unisia Jecs Corp Device for inspecting atomization pattern of injection valve
JP2001050866A (en) * 1999-08-06 2001-02-23 Denso Corp Apparatus and method for inspecting spray

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JPH10288132A (en) * 1997-04-18 1998-10-27 Mitsubishi Electric Corp Spray distribution measuring device and measuring method
JPH11352021A (en) * 1998-06-05 1999-12-24 Unisia Jecs Corp Device for inspecting atomization pattern of injection valve
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