JP4519497B2 - Water level gauge mounting structure - Google Patents

Water level gauge mounting structure Download PDF

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Publication number
JP4519497B2
JP4519497B2 JP2004094375A JP2004094375A JP4519497B2 JP 4519497 B2 JP4519497 B2 JP 4519497B2 JP 2004094375 A JP2004094375 A JP 2004094375A JP 2004094375 A JP2004094375 A JP 2004094375A JP 4519497 B2 JP4519497 B2 JP 4519497B2
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Prior art keywords
water level
level gauge
reducing agent
mounting structure
heat exchanger
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JP2004094375A
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JP2005283201A (en
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靖司 尾作
俊男 近藤
喜代史 福田
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UD Trucks Corp
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UD Trucks Corp
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Priority to JP2004094375A priority Critical patent/JP4519497B2/en
Priority to CN2005800104993A priority patent/CN100406859C/en
Priority to PCT/JP2005/003934 priority patent/WO2005093382A1/en
Priority to EP05720206.1A priority patent/EP1731882B1/en
Publication of JP2005283201A publication Critical patent/JP2005283201A/en
Priority to US11/528,597 priority patent/US7544328B2/en
Priority to US12/371,874 priority patent/US7943101B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1814—Tank level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

本発明は、液体還元剤を用いて排気中の窒素酸化物（ＮＯｘ）を還元浄化する排気浄化装置において、特に、液体還元剤を貯蔵する還元剤容器に水位計を取り付ける技術に関する。   The present invention relates to an exhaust purification apparatus that reduces and purifies nitrogen oxides (NOx) in exhaust using a liquid reducing agent, and more particularly to a technique for attaching a water level meter to a reducing agent container that stores a liquid reducing agent.

エンジン排気に含まれるＮＯｘを除去する触媒浄化システムとして、特開２０００−２７６２７号公報（特許文献１）に開示された排気浄化装置が提案されている。かかる排気浄化装置は、エンジン排気系に配設された還元触媒の排気上流に、エンジン運転状態に応じた必要量の液体還元剤を噴射供給することで、排気中のＮＯｘと液体還元剤とを触媒還元反応させて、ＮＯｘを無害成分に浄化処理するものである。ここで、還元反応は、ＮＯｘと反応性が良好なアンモニアを用いるもので、液体還元剤としては、排気熱及び排気中の水蒸気により加水分解してアンモニアを発生する尿素水溶液が用いられる。
特開２０００−２７６２７号公報 As a catalyst purification system for removing NOx contained in engine exhaust, an exhaust purification device disclosed in Japanese Patent Application Laid-Open No. 2000-27627 (Patent Document 1) has been proposed. Such an exhaust purification device injects and supplies a required amount of liquid reducing agent according to the engine operating state to the upstream side of the exhaust of the reduction catalyst disposed in the engine exhaust system, thereby reducing NOx and liquid reducing agent in the exhaust. A catalytic reduction reaction is performed to purify NOx into harmless components. Here, the reduction reaction uses ammonia having good reactivity with NOx, and as the liquid reducing agent, an aqueous urea solution that generates ammonia by hydrolysis with exhaust heat and water vapor in the exhaust is used.
JP 2000-27627 A

ところで、液体還元剤を貯蔵する還元剤容器には、排気浄化装置としての機能を発揮可能とすべく、少なくとも、液体還元剤の濃度を検出する濃度計，エンジン冷却水を循環させて液体還元剤の凍結を防止する熱交換器，液体還元剤の残量を検出する水位計を取り付ける必要がある。濃度計及び水位計は、定期的な点検整備が必要なことから、還元剤容器に着脱可能に取り付けられた天蓋に対して、その基部が固定された片持状態で取り付けられる。また、水位計としては、横断面が円形をなす内側電極及び外側電極を同心に配設し、両電極間に介在する液体還元剤の水位変化に伴って変化する静電容量から、その水位を検出するものが用いられる。このとき、かかる水位計においては、内側電極と外側電極との間の微小間隔を略一定に保つ必要がある。   By the way, in the reducing agent container for storing the liquid reducing agent, at least a concentration meter for detecting the concentration of the liquid reducing agent and the engine cooling water are circulated to enable the liquid reducing agent to function as an exhaust purification device. It is necessary to install a heat exchanger to prevent freezing and a water level meter to detect the remaining amount of liquid reducing agent. Since the concentration meter and the water level meter need regular inspection and maintenance, they are attached to the canopy attached to the reducing agent container in a detachable manner with its base fixed. In addition, as a water level meter, an inner electrode and an outer electrode having a circular cross section are arranged concentrically, and the water level is determined from the capacitance that changes with the change in the water level of the liquid reducing agent interposed between both electrodes. What is detected is used. At this time, in such a water level gauge, it is necessary to keep the minute distance between the inner electrode and the outer electrode substantially constant.

しかしながら、水位計を片持状態で固定すると、その先端部が振動などによって揺れ易く、内側電極と外側電極との微小間隔が不安定となり、液体還元剤の水位を正確に検出することができないおそれがあった。また、水位計の先端部を還元剤容器の底壁に固定すればこのような不具合は解消できるが、水位計のみならず濃度計及び熱交換器を着脱することができなくなり、到底採用し得る構成ではなかった。さらに、濃度計及び熱交換器とは別に、水位計のみを着脱可能とする要望もあり、この要望にも応える必要があった。   However, if the water level meter is fixed in a cantilever state, the tip of the water level meter is likely to be shaken by vibration, etc., and the minute distance between the inner electrode and the outer electrode becomes unstable, and the water level of the liquid reducing agent may not be accurately detected. was there. Moreover, if the tip of the water level meter is fixed to the bottom wall of the reducing agent container, such a problem can be solved, but not only the water level meter but also the concentration meter and the heat exchanger cannot be attached and detached, and can be adopted at all It was not a configuration. In addition to the concentration meter and the heat exchanger, there is also a request to be able to attach and detach only the water level meter, and it is necessary to meet this demand.

そこで、本発明は以上のような従来の問題点に鑑み、水位計の基部を還元剤容器の天蓋に着脱可能に締結する一方、その先端部を熱交換器に固定したブラケットに着脱可能に挿入することで、水位計の検出精度を確保しつつ着脱を容易にした水位計取付構造を提供することを目的とする。   Therefore, in view of the conventional problems as described above, the present invention detachably fastens the base of the water level meter to the canopy of the reducing agent container, and detachably inserts the tip of the water gauge into a bracket fixed to the heat exchanger. Thus, an object of the present invention is to provide a water level meter mounting structure that facilitates attachment and detachment while ensuring detection accuracy of the water level meter.

このため、請求項１記載の発明では、排気中の窒素酸化物を還元反応により浄化する排気浄化装置で使用される液体還元剤を貯蔵する還元剤容器に、液体還元剤の残量を検出する水位計を取り付ける水位計取付構造において、前記還元剤容器に対して着脱可能に締結される天蓋に、前記水位計の基部を着脱可能に締結すると共に、エンジンを熱源とする熱媒体を循環させて液体還元剤との間で熱交換を行う熱交換器を取り付ける一方、前記水位計の基部から垂下される検出部の先端部に、その軸方向へと延びるピンを取り付け、該ピンが着脱可能に挿入される挿入孔を有するブラケットを、前記還元剤容器の底面と所定間隔を隔てつつ該底面と平行に延びる熱交換器の部位に取り付けたことを特徴とする。 Therefore, in the first aspect of the present invention, the remaining amount of the liquid reducing agent is detected in the reducing agent container that stores the liquid reducing agent used in the exhaust purification device that purifies the nitrogen oxides in the exhaust gas by the reduction reaction. In the water level gauge mounting structure for attaching the water level gauge, the base of the water level gauge is detachably fastened to the canopy that is detachably fastened to the reducing agent container, and a heat medium having the engine as a heat source is circulated. While attaching a heat exchanger that exchanges heat with the liquid reducing agent, a pin extending in the axial direction is attached to the tip of the detection unit that hangs down from the base of the water level gauge, so that the pin can be attached and detached A bracket having an insertion hole to be inserted is attached to a portion of a heat exchanger that extends in parallel with the bottom surface of the reducing agent container while being spaced apart from the bottom surface of the reducing agent container .

請求項２記載の発明では、前記ピンは、その先端部に向かうにつれて縮径するテーパ形状に形成されたことを特徴とする。
請求項３記載の発明では、前記熱交換器は、前記熱媒体の入口及び出口に夫々接続される略Ｕ字形状の管材を屈曲形成して構成されたことを特徴とする。
請求項４記載の発明では、前記管材の先端屈曲部は、前記天蓋に固定されたブラケットにより支持されたことを特徴とする。 The invention according to claim 2 is characterized in that the pin is formed in a taper shape having a diameter reduced toward the tip.
The invention according to claim 3 is characterized in that the heat exchanger is configured by bending and forming a substantially U-shaped pipe connected to the inlet and outlet of the heat medium.
The invention according to claim 4 is characterized in that a distal end bent portion of the tube material is supported by a bracket fixed to the canopy.

請求項１記載の発明によれば、還元剤容器に取り付けられた水位計を点検整備するときには、次のような２つの手順により、還元剤容器から水位計を取り外す。第１の手順としては、還元剤容器から天蓋を取り外し、熱交換器が還元剤容器に干渉しないように上方に向けて引き抜く。このとき、天蓋には、熱交換器に加えて水位計の基部が締結されているため、水位計も同時に取り外すことができる。また、第２の手順としては、天蓋から水位計を取り外し、その検出部が還元剤容器に干渉しないように上方に向けて引く抜く。このとき、水位計の先端部のピンは、水位計の上方への引き抜きに伴って、ブラケットの挿入孔から抜け出る。このため、還元剤容器から水位計のみを取り外すことができる。なお、水位計の点検整備が完了したときには、このような手順を逆に順次実行し、水位計を還元剤容器に取り付ければよい。   According to the first aspect of the invention, when the water level gauge attached to the reducing agent container is inspected and maintained, the water level gauge is removed from the reducing agent container by the following two procedures. As a first procedure, the canopy is removed from the reducing agent container, and the heat exchanger is pulled upward so as not to interfere with the reducing agent container. At this time, since the base of the water level meter is fastened to the canopy in addition to the heat exchanger, the water level meter can be removed at the same time. As a second procedure, the water level meter is removed from the canopy and pulled upward so that the detection part does not interfere with the reducing agent container. At this time, the pin at the tip of the water level gauge comes out of the insertion hole of the bracket as the water level gauge is pulled upward. For this reason, only the water level gauge can be removed from the reducing agent container. It should be noted that when the inspection and maintenance of the water level gauge is completed, such a procedure may be sequentially executed in reverse order to attach the water level gauge to the reducing agent container.

従って、水位計の点検整備を行うときに、還元剤容器を一々分解する必要がなく、その工数を大幅に低減することができる。また、水位計の先端部は、熱交換器に取り付けられたブラケットにより支持されるため、振動などによって容易に揺れ動くことがなく、液体還元剤の水位を正確に検出することができる。
請求項２記載の発明によれば、ピンは先端部に向かうにつれて縮径するテーパ形状に形成されているため、ブラケットの挿入孔に挿入することが容易であると共に、挿入孔とピンとの隙間が小さくなってがたつきを防止することができる。 Therefore, when the water level gauge is inspected and maintained, it is not necessary to disassemble the reducing agent container one by one, and the number of man-hours can be greatly reduced. In addition, since the tip of the water level meter is supported by a bracket attached to the heat exchanger, the water level of the liquid reducing agent can be accurately detected without being easily shaken by vibration or the like.
According to the second aspect of the present invention, since the pin is formed in a tapered shape whose diameter decreases toward the tip, it is easy to insert the pin into the insertion hole of the bracket, and there is a gap between the insertion hole and the pin. It becomes possible to prevent rattling from becoming smaller.

請求項３記載の発明によれば、熱交換器は熱媒体の入口及び出口に夫々接続される略Ｕ字形状の管材を屈曲形成して構成されるので、還元剤容器内での全長が長くなり、液体還元剤との間で効率的に熱交換を行うことができる。
請求項４記載の発明によれば、熱交換器は、熱媒体の入口及び出口に接続されることに加え、これを構成する管材の先端屈曲部が天蓋に固定されたブラケットにより支持される。このため、熱交換器は天蓋に対して３点で支持固定されることとなり、その取付剛性を高めることができる。 According to the invention described in claim 3, since the heat exchanger is formed by bending substantially U-shaped tubes connected to the inlet and outlet of the heat medium, the total length in the reducing agent container is long. Thus, heat exchange can be efficiently performed with the liquid reducing agent.
According to the invention described in claim 4, in addition to being connected to the inlet and outlet of the heat medium, the heat exchanger is supported by the bracket fixed to the canopy at the tip bent portion of the tube material constituting the heat exchanger. For this reason, the heat exchanger is supported and fixed at three points with respect to the canopy, and its mounting rigidity can be increased.

以下、添付された図面を参照して本発明を詳述する。
図１は、尿素水溶液を液体還元剤として使用し、エンジン排気中に含まれるＮＯｘを還元触媒反応により浄化する排気浄化装置の全体構成を示す。
エンジン１０の排気マニフォールド１２に接続される排気管１４には、排気流通方向に沿って、一酸化窒素（ＮＯ）を二酸化窒素（ＮＯ2）へと酸化させる酸化触媒１６と、尿素水溶液を噴射供給する噴射ノズル１８と、尿素水溶液を加水分解して得られるアンモニアによりＮＯｘを還元浄化するＮＯｘ還元触媒２０と、ＮＯｘ還元触媒２０を通過したアンモニアを酸化させるアンモニア酸化触媒２２と、が夫々配設される。また、還元剤容器２４に貯蔵される尿素水溶液は、その底部に吸込口が位置する供給配管２６を介して還元剤供給装置２８に供給される一方、還元剤供給装置２８で噴射に寄与しない余剰の尿素水溶液は、戻り配管３０を介して還元剤容器２４の上部空間内へと戻される。そして、還元剤供給装置２８は、コンピュータを内蔵したコントロールユニット３２により制御され、エンジン運転状態に応じた必要量の尿素水溶液を、空気と混合しつつ噴射ノズル１８に供給する。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an overall configuration of an exhaust purification apparatus that uses an aqueous urea solution as a liquid reducing agent and purifies NOx contained in engine exhaust by a reduction catalytic reaction.
An exhaust pipe 14 connected to the exhaust manifold 12 of the engine 10 is supplied with an oxidation catalyst 16 for oxidizing nitrogen monoxide (NO) into nitrogen dioxide (NO 2 ) and an aqueous urea solution along the exhaust circulation direction. An NOx reduction catalyst 20 for reducing and purifying NOx with ammonia obtained by hydrolyzing the urea aqueous solution, and an ammonia oxidation catalyst 22 for oxidizing the ammonia that has passed through the NOx reduction catalyst 20 are provided. The Further, the urea aqueous solution stored in the reducing agent container 24 is supplied to the reducing agent supply device 28 via the supply pipe 26 in which the suction port is located at the bottom thereof, while the reducing agent supply device 28 does not contribute to the injection. The urea aqueous solution is returned to the upper space of the reducing agent container 24 through the return pipe 30. The reducing agent supply device 28 is controlled by a control unit 32 having a built-in computer, and supplies a necessary amount of urea aqueous solution according to the engine operating state to the injection nozzle 18 while mixing with air.

かかる排気浄化装置において、噴射ノズル１８から噴射供給された尿素水溶液は、排気熱及び排気中の水蒸気により加水分解され、アンモニアを発生する。発生したアンモニアは、ＮＯｘ還元触媒２０において排気中のＮＯｘと反応し、水及び無害なガスに浄化されることは知られたことである。このとき、ＮＯｘ還元触媒２０によるＮＯｘ浄化率を向上させるべく、酸化触媒１６によりＮＯがＮＯ2へと酸化され、排気中のＮＯとＮＯ2との割合が触媒還元反応に適したものに改善される。また、ＮＯｘ還元触媒２０を通過したアンモニアは、その排気下流に配設されたアンモニア酸化触媒２２により酸化されるので、異臭を放つアンモニアがそのまま大気中に放出されることを防止できる。 In such an exhaust purification device, the urea aqueous solution injected and supplied from the injection nozzle 18 is hydrolyzed by exhaust heat and water vapor in the exhaust to generate ammonia. It is known that the generated ammonia reacts with NOx in the exhaust gas in the NOx reduction catalyst 20 and is purified to water and harmless gas. At this time, in order to improve the NOx purification rate by the NOx reduction catalyst 20, NO is oxidized to NO 2 by the oxidation catalyst 16, and the ratio of NO and NO 2 in the exhaust gas is improved to be suitable for the catalytic reduction reaction. The Further, since the ammonia that has passed through the NOx reduction catalyst 20 is oxidized by the ammonia oxidation catalyst 22 disposed downstream of the exhaust gas, it is possible to prevent ammonia that emits a strange odor from being released into the atmosphere as it is.

還元剤容器２４は、図２に示すように、略直方体形状をなす容器本体２４Ａの長手方向の２面幅を形成する側面上部に、尿素水溶液を補充するための補充口２４Ｂ及び搬送時に把持する取手２４Ｃが夫々形成されたものである。また、容器本体２４Ａの上面には、図示しない開口部が形成され、これを閉塞するように、締結部材としての複数のボルト３４により天蓋３６が着脱可能に締結される。   As shown in FIG. 2, the reducing agent container 24 is gripped at the time of transportation by a replenishing port 24B for replenishing the urea aqueous solution to the upper part of the side surface forming the two widths in the longitudinal direction of the container body 24A having a substantially rectangular parallelepiped shape. Each of the handles 24C is formed. An opening (not shown) is formed on the upper surface of the container main body 24A, and the canopy 36 is detachably fastened by a plurality of bolts 34 as fastening members so as to close the opening.

天蓋３６の上面には、その一端部から中央部にかけて、エンジンを熱源とする熱媒体としてのエンジン冷却水の入口３６Ａ及び出口３６Ｂと、尿素水溶液の供給口３６Ｃ及び戻り口３６Ｄと、内部の上部空間が負圧とならないように大気開放する開放口３６Ｅと、が夫々形成される。また、天蓋３６には、その中央部から他端部にかけて、尿素水溶液の残量を検出する水位計３８の基部３８Ａと、尿素水溶液の濃度を検出する濃度計４０の基部４０Ａと、が締結部材としてのボルト４２により夫々着脱可能に締結される。水位計３８は、横断面が円形をなす内側電極及び外側電極を同心に配置し、両電極間の静電容量変化から尿素水溶液の水位を検出するもので、その基部３８Ａから容器本体２４Ａの底部に向かって、内側電極及び外側電極からなる検出部３８Ｂが垂下される。一方、濃度計４０は、離間した２点間の温度伝達特性から尿素水溶液の濃度を検出するもので、容器本体２４Ａの底部に検出部４０Ｂが位置するように、その基部４０Ａから検出部４０Ｂが垂下される。   On the top surface of the canopy 36, from one end to the center, an inlet 36A and an outlet 36B for engine cooling water as a heat medium using the engine as a heat source, a supply port 36C and a return port 36D for urea aqueous solution, and an upper portion inside An opening 36E that opens to the atmosphere so that the space does not become negative pressure is formed. The canopy 36 includes a base 38A of a water level meter 38 that detects the remaining amount of the urea aqueous solution and a base 40A of a concentration meter 40 that detects the concentration of the urea aqueous solution from the center to the other end of the canopy 36. The bolts 42 are detachably fastened. The water level meter 38 has an inner electrode and an outer electrode concentrically arranged in a circular cross section, and detects the water level of the urea aqueous solution from the capacitance change between both electrodes. The detection part 38B which consists of an inner side electrode and an outer side electrode is drooped toward. On the other hand, the densitometer 40 detects the concentration of the urea aqueous solution from the temperature transfer characteristics between two spaced points, and the detection unit 40B extends from the base 40A so that the detection unit 40B is located at the bottom of the container body 24A. Drooped.

エンジン冷却水の入口３６Ａ及び出口３６Ｂは、容器本体２４Ａ内に配設される熱交換器４４により夫々接続される。熱交換器４４は、略Ｕ字形状の管材を、容器本体２４Ａの底部において水位計３８及び濃度計４０を取り囲むように屈曲形成させると共に、その先端屈曲部４４Ａを、天蓋３６に固定されたブラケット４６により支持させるものである。尿素水溶液の供給口３６Ｃには、容器本体２４Ａの底部から尿素水溶液を吸い込む吸込管４８が接続される。吸込管４８は、熱交換器４４と熱交換すべく、エンジン冷却水の入口３６Ａに接続される管材に沿わせるように配置される。 The engine cooling water inlet 36A and the outlet 36B are connected to each other by a heat exchanger 44 disposed in the container main body 24A. The heat exchanger 44 is formed by bending a substantially U-shaped tube material so as to surround the water level meter 38 and the concentration meter 40 at the bottom of the container main body 24A, and the tip bent portion 44A is a bracket fixed to the canopy 36. 46 is supported. A suction pipe 48 for sucking the urea aqueous solution from the bottom of the container main body 24A is connected to the urea aqueous solution supply port 36C. The suction pipe 48 is arranged along a pipe connected to the engine cooling water inlet 36 </ b> A in order to exchange heat with the heat exchanger 44.

また、熱交換器４４の容器本体２４Ａの底面に沿って所定間隔を隔てつつ平行に延びる部位であって、水位計３８の検出部３８Ａに対応した部位には、図３〜図５で詳細に示すように、横断面が略ハット形状のブラケット５０が固定される。一方、水位計３８の検出部３８Ｂ先端部には、先端部に向かうにつれて縮径するテーパ形状のピン５２Ａが形成されたキャップ５２が圧入固定される。そして、ブラケット５０の上面に開設された挿入孔５０Ａに、キャップ５２のピン５２Ａが挿入することで、水位計３８の先端部が支持される。   Further, a portion extending in parallel with a predetermined interval along the bottom surface of the container main body 24A of the heat exchanger 44 and corresponding to the detecting portion 38A of the water level gauge 38 is shown in detail in FIGS. As shown, a bracket 50 having a substantially hat-shaped cross section is fixed. On the other hand, a cap 52 having a tapered pin 52A having a diameter reduced toward the tip is press-fitted and fixed to the tip of the detector 38B of the water level gauge 38. And the front-end | tip part of the water level indicator 38 is supported by inserting the pin 52A of the cap 52 in the insertion hole 50A opened in the upper surface of the bracket 50. As shown in FIG.

さらに、熱交換器４４の下部には、還元剤容器２４内で凍結した尿素水溶液の氷片から水位計３８及び濃度計４０を保護するように、上面のみが開口する略箱型形状のプロテクタ５４が固定される。このようにすれば、尿素水溶液の氷片が還元剤容器２４内で暴れても、例えば、これが濃度計４０の検出部４０Ｂに激突することがなく、破損による故障発生などを未然に防止することができる。   Further, at the lower part of the heat exchanger 44, a substantially box-shaped protector 54 whose upper surface only opens so as to protect the water level meter 38 and the concentration meter 40 from the ice pieces of the urea aqueous solution frozen in the reducing agent container 24. Is fixed. In this way, even if the ice piece of the urea aqueous solution breaks down in the reducing agent container 24, for example, it does not collide with the detection unit 40B of the densitometer 40, and the occurrence of a failure due to breakage can be prevented. Can do.

そして、還元剤容器２４に取り付けられた水位計３８及び濃度計４０を点検整備するときには、天蓋３６を容器本体２４Ａに締結しているボルト３４を取り外し、熱交換器４４が容器本体２４Ａと干渉しないように上方に向けて引く抜く。このとき、天蓋３６には、熱交換器４４に加え、水位計３８及び濃度計４０が締結されているので、これらも同時に取り外すことができる。そして、水位計３８及び濃度計４０の点検整備が完了したならば、容器本体２４Ａの上面に開設された開口部から熱交換器４４を挿入し、その上面に天蓋３６をボルト３４により締結する。 When the water level meter 38 and the concentration meter 40 attached to the reducing agent container 24 are inspected and maintained, the bolt 34 that fastens the canopy 36 to the container body 24A is removed, and the heat exchanger 44 does not interfere with the container body 24A. Pull it out upward. At this time, since the water level meter 38 and the concentration meter 40 are fastened to the canopy 36 in addition to the heat exchanger 44, these can also be removed at the same time. When the inspection and maintenance of the water level meter 38 and the concentration meter 40 are completed, the heat exchanger 44 is inserted from the opening formed on the upper surface of the container main body 24A , and the canopy 36 is fastened to the upper surface with the bolts 34.

一方、還元剤容器２４に取り付けられた水位計３８のみを点検整備するときには、その基部３８Ａを天蓋３６に締結しているボルト４２を取り外し、検出部３８Ｂが容器本体２４Ａと干渉しないように上方に向けて引く抜く。このとき、検出部３８Ｂの先端部に圧入固定されているキャップ５２のピン５２Ａは、水位計３８の上方への引き抜きに伴って、ブラケット５０の挿入孔５０Ａから抜け出す。そして、水位計３８の点検整備が完了したならば、キャップ５２のピン５２Ａをブラケット５０の挿入孔５０Ａに挿入しつつ、天蓋３８に水位計３８の基部３８Ａをボルト４２により締結する。このとき、ピン５２Ａは、その先端部に向かうにつれて縮径するテーパ形状に形成されているので、挿入孔５０Ａへの挿入が容易であると共に、挿入孔５０Ａとの間の隙間が小さくなってがたつきを防止することができる。   On the other hand, when only the water level gauge 38 attached to the reducing agent container 24 is inspected and maintained, the bolt 42 that fastens the base portion 38A to the canopy 36 is removed, and the detection portion 38B is moved upward so as not to interfere with the container body 24A. Pull it out. At this time, the pin 52A of the cap 52 that is press-fitted and fixed to the tip of the detection unit 38B is pulled out from the insertion hole 50A of the bracket 50 as the water level gauge 38 is pulled upward. When the inspection and maintenance of the water level gauge 38 is completed, the base 38A of the water level gauge 38 is fastened to the canopy 38 with the bolt 42 while the pin 52A of the cap 52 is inserted into the insertion hole 50A of the bracket 50. At this time, since the pin 52A is formed in a tapered shape that decreases in diameter toward the tip, the insertion into the insertion hole 50A is easy and the gap between the insertion hole 50A and the pin 52A is reduced. Shaking can be prevented.

このような点検整備を行うとき、天蓋３６及びこれと一体化されている水位計３８などは、容器本体２４Ａの内壁に固定されていないため、還元剤容器２４を分解する必要がなく、その工数を大幅に削減することができる。また、水位計３８の検出部３８Ａ先端部は、熱交換器４４に固定されたブラケット５０により支持されるため、振動などにより容易に揺れ動くことがなく、内側電極と外側電極との間の微小間隔を略一定に保てることから、尿素水溶液の水位を正確に検出することができる。   When performing such inspection and maintenance, the canopy 36 and the water level gauge 38 integrated with the canopy 36 are not fixed to the inner wall of the container body 24A. Can be greatly reduced. In addition, since the tip end of the detection unit 38A of the water level gauge 38 is supported by the bracket 50 fixed to the heat exchanger 44, it is not easily shaken by vibration or the like, and a minute distance between the inner electrode and the outer electrode. Therefore, the water level of the urea aqueous solution can be accurately detected.

また、熱交換器４４を構成する管材の先端屈曲部４４Ａは、天蓋３６に固定されたブラケット４６により支持されるため、天蓋３６に対して熱交換器４４は３点で支持固定されることとなり、その取付剛性を高めることができる。さらに、水位計３８の先端部を支持するブラケット５０は、熱交換器４４の容器本体２４Ａの底面に沿って所定間隔を隔てつつ平行に延びる部位に取り付けられるため、熱交換器４４を構成する管材の中間部が天蓋３６により支持されることとなり、その剛性を一層高めることができる。そして、このような作用の相乗効果により、天蓋３６に対する熱交換器４４，水位計３８及び濃度計４０の取付剛性がさらに高まり、例えば、耐振動性を大幅に向上させることができる。   Further, the bent end portion 44A of the tube material constituting the heat exchanger 44 is supported by a bracket 46 fixed to the canopy 36, so that the heat exchanger 44 is supported and fixed to the canopy 36 at three points. The mounting rigidity can be increased. Furthermore, the bracket 50 that supports the tip of the water level gauge 38 is attached to a portion that extends in parallel with a predetermined interval along the bottom surface of the container main body 24A of the heat exchanger 44. The intermediate portion is supported by the canopy 36, and the rigidity can be further increased. And the synergistic effect of such an action further increases the mounting rigidity of the heat exchanger 44, the water level meter 38 and the concentration meter 40 with respect to the canopy 36, and for example, the vibration resistance can be greatly improved.

なお、本発明は、尿素水溶液を液体還元剤として使用する排気浄化装置に限らず、炭化水素を主成分とするガソリン，軽油，アルコールなどを液体還元剤として使用するものにも適用可能であることはいうまでもない。   The present invention is not limited to an exhaust gas purification device that uses an aqueous urea solution as a liquid reducing agent, but can also be applied to those that use gasoline, light oil, alcohol, or the like mainly containing hydrocarbons as a liquid reducing agent. Needless to say.

本発明の適用対象である排気浄化装置の全体構成図Overall configuration diagram of an exhaust emission control device to which the present invention is applied 還元剤容器及びその内部配置を示す斜視図The perspective view which shows a reducing agent container and its internal arrangement | positioning 水位計の先端支持構造を示す斜視図Perspective view showing tip support structure of water level gauge 水位計の先端支持構造を示す側面図Side view showing tip support structure of water level gauge 水位計の先端支持構造を示す正面図Front view showing the tip support structure of the water level gauge

符号の説明Explanation of symbols

１８ 噴射ノズル
２０ ＮＯｘ還元触媒
２４ 還元剤容器
２４Ａ 容器本体
２６ 供給配管
２８ 還元剤供給装置
３０ 戻り配管
３２ コントロールユニット
３４ ボルト
３６ 天蓋
３６Ａ 入口
３６Ｂ 出口
３８ 水位計
３８Ａ 基部
３８Ｂ 検出部
４２ ボルト
４４ 熱交換器
４４Ａ 先端屈曲部
４６ ブラケット
５０ ブラケット
５０Ａ 挿入孔
５２ キャップ
５２Ａ ピン
18 injection nozzle 20 NOx reduction catalyst 24 reducing agent container 24A container main body 26 supply piping 28 reducing agent supply device 30 return piping 32 control unit 34 bolt 36 canopy 36A inlet 36B outlet 38 water level gauge 38A base 38B detector 42 bolt 44 heat exchanger 44A Tip Bend 46 Bracket 50 Bracket 50A Insertion Hole 52 Cap 52A Pin

Claims (4)

排気中の窒素酸化物を還元反応により浄化する排気浄化装置で使用される液体還元剤を貯蔵する還元剤容器に、液体還元剤の残量を検出する水位計を取り付ける水位計取付構造において、
前記還元剤容器に対して着脱可能に締結される天蓋に、前記水位計の基部を着脱可能に締結すると共に、エンジンを熱源とする熱媒体を循環させて液体還元剤との間で熱交換を行う熱交換器を取り付ける一方、前記水位計の基部から垂下される検出部の先端部に、その軸方向へと延びるピンを取り付け、該ピンが着脱可能に挿入される挿入孔を有するブラケットを、前記還元剤容器の底面と所定間隔を隔てつつ該底面と平行に延びる熱交換器の部位に取り付けたことを特徴とする水位計取付構造。 In a water level gauge mounting structure in which a water level gauge that detects the remaining amount of liquid reducing agent is attached to a reducing agent container that stores the liquid reducing agent used in an exhaust gas purification device that purifies nitrogen oxides in exhaust gas by a reduction reaction.
The base of the water level gauge is detachably fastened to a canopy that is detachably fastened to the reductant container, and heat exchange with the liquid reductant is performed by circulating a heat medium having the engine as a heat source. While attaching the heat exchanger to be performed, a pin extending in the axial direction is attached to the distal end portion of the detection unit suspended from the base of the water level gauge, and a bracket having an insertion hole into which the pin is detachably inserted, A water level gauge mounting structure, wherein the water level gauge mounting structure is attached to a portion of a heat exchanger that extends in parallel with the bottom surface of the reducing agent container at a predetermined interval . 前記ピンは、その先端部に向かうにつれて縮径するテーパ形状に形成されたことを特徴とする請求項１記載の水位計取付構造。   The water level gauge mounting structure according to claim 1, wherein the pin is formed in a tapered shape having a diameter reduced toward a tip portion thereof. 前記熱交換器は、前記熱媒体の入口及び出口に夫々接続される略Ｕ字形状の管材を屈曲形成して構成されたことを特徴とする請求項１又は請求項２に記載の水位計取付構造。   3. The water level gauge attachment according to claim 1, wherein the heat exchanger is formed by bending a substantially U-shaped pipe connected to an inlet and an outlet of the heat medium, respectively. Construction. 前記管材の先端屈曲部は、前記天蓋に固定されたブラケットにより支持されたことを特徴とする請求項３記載の水位計取付構造。   The water level gauge mounting structure according to claim 3, wherein the bent end portion of the pipe material is supported by a bracket fixed to the canopy.
JP2004094375A 2004-03-29 2004-03-29 Water level gauge mounting structure Expired - Fee Related JP4519497B2 (en)

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CN2005800104993A CN100406859C (en) 2004-03-29 2005-03-08 Structure for reducing agent container
PCT/JP2005/003934 WO2005093382A1 (en) 2004-03-29 2005-03-08 Structure for reducing agent container
EP05720206.1A EP1731882B1 (en) 2004-03-29 2005-03-08 Structure for reducing agent container
US11/528,597 US7544328B2 (en) 2004-03-29 2006-09-28 Structure for reducing agent container
US12/371,874 US7943101B2 (en) 2004-03-29 2009-02-16 Structure for reducing agent container

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