JP3686667B1 - Reducing agent container structure - Google Patents

Reducing agent container structure Download PDF

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Publication number
JP3686667B1
JP3686667B1 JP2004303615A JP2004303615A JP3686667B1 JP 3686667 B1 JP3686667 B1 JP 3686667B1 JP 2004303615 A JP2004303615 A JP 2004303615A JP 2004303615 A JP2004303615 A JP 2004303615A JP 3686667 B1 JP3686667 B1 JP 3686667B1
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reducing agent
canopy
water level
liquid reducing
meter
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JP2005337227A (en
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靖司 尾作
喜代史 福田
俊男 近藤
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UD Trucks Corp
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UD Trucks Corp
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Priority to JP2004303615A priority Critical patent/JP3686667B1/en
Priority to PCT/JP2005/003934 priority patent/WO2005093382A1/en
Priority to EP05720206.1A priority patent/EP1731882B1/en
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Publication of JP3686667B1 publication Critical patent/JP3686667B1/en
Publication of JP2005337227A publication Critical patent/JP2005337227A/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
    • F01N2900/1818—Concentration of the reducing agent
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

【課題】 濃度計及び水位計の点検整備を容易にする。
【解決手段】 容器本体２４Ａの上面に開設された開口部を閉塞すべく、容器本体２４Ａに対してボルト３４により着脱可能に締結される天蓋３６に、液体還元剤の残量を検出する水位計３８の基部３８Ａと、液体還元剤の濃度を検出する濃度計４０の基部４０Ａと、水位計３８及び濃度計４０の基部３８Ａ及び４０Ａから夫々垂下された検出部３８Ｂ及び４０Ｂを囲みつつ、エンジン冷却水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４４と、を夫々取り付けると共に、液体還元剤の供給口３６Ｃ及び戻り口３６Ｄを夫々形成する。そして、天蓋３６に対して水位計３８，濃度計４０，熱交換器４４並びに液体還元剤の供給口３６Ｃ及び戻り口３６Ｄを一体化することで、天蓋３６と共に水位計３８及び濃度計４０を同時に取り外せるようにする。
【選択図】 図２ [PROBLEMS] To facilitate inspection and maintenance of a concentration meter and a water level meter.
A water level meter that detects a remaining amount of liquid reducing agent on a canopy 36 that is detachably fastened to a container main body 24A by a bolt 34 so as to close an opening formed on an upper surface of the container main body 24A. The engine is cooled while surrounding the base 38A of 38, the base 40A of the concentration meter 40 for detecting the concentration of the liquid reducing agent, and the detection units 38B and 40B suspended from the bases 38A and 40A of the water level meter 38 and the concentration meter 40, respectively. A heat exchanger 44 that circulates water and exchanges heat with the liquid reducing agent is attached, and a liquid reducing agent supply port 36C and a return port 36D are formed. The water level meter 38, the concentration meter 40, the heat exchanger 44, and the liquid reducing agent supply port 36 </ b> C and the return port 36 </ b> D are integrated with the canopy 36, so that the water level meter 38 and the concentration meter 40 can be used simultaneously with the canopy 36. Make it removable.
[Selection] Figure 2

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、液体還元剤の濃度及び残量を夫々検出する濃度計及び水位計の点検整備を容易にする技術に関する。   The present invention relates to an exhaust gas purification apparatus that reduces and purifies nitrogen oxide (NOx) in exhaust gas using a liquid reducing agent, and in particular, inspects and maintains a concentration meter and a water level meter that detect the concentration and remaining amount of the liquid reducing agent, respectively. Relating to technology that facilitates

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、液体還元剤の濃度及び残量を夫々検出する濃度計及び水位計、並びに、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を夫々取り付けると共に、液体還元剤の供給口及び戻り口を夫々形成する必要がある。このとき、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、還元剤容器に対して着脱可能に取り付けることが要求される。   By the way, in the reducing agent container for storing the liquid reducing agent, at least a concentration meter and a water level meter for detecting the concentration and the remaining amount of the liquid reducing agent, respectively, and an engine so that the function as an exhaust purification device can be exhibited. It is necessary to install a heat exchanger for circulating the cooling water to prevent the liquid reducing agent from freezing, and to form a supply port and a return port for the liquid reducing agent, respectively. At this time, since the concentration meter and the water level meter need to be regularly inspected and maintained, it is required to be detachably attached to the reducing agent container.

しかしながら、還元剤容器に対して濃度計及び水位計が着脱可能であっても、その着脱に多大な手間が必要であれば点検整備に時間がかかり、排気浄化装置の機能を維持するためのコストが上昇してしまうおそれがあった。また、点検整備に要するコスト上昇を避けるために、点検整備の間隔が長くなり、排気浄化装置の機能が不十分のままエンジンを稼動させてしまうおそれもあった。   However, even if the concentration meter and the water level meter can be attached to and detached from the reducing agent container, if much labor is required for the attachment and detachment, it takes time for inspection and maintenance, and the cost for maintaining the function of the exhaust purification device Could rise. In addition, in order to avoid an increase in cost required for inspection and maintenance, the interval between inspection and maintenance becomes longer, and there is a possibility that the engine may be operated with the function of the exhaust purification device being insufficient.

そこで、本発明は以上のような従来の問題点に鑑み、還元剤容器から濃度計及び水位計を容易に着脱可能とすることで、点検整備に要する労力を軽減した還元剤容器の構造を提供することを目的とする。   Accordingly, in view of the above-described conventional problems, the present invention provides a reducing agent container structure that reduces labor required for inspection and maintenance by making it possible to easily attach and detach the concentration meter and the water level meter from the reducing agent container. The purpose is to do.

このため、請求項１記載の発明では、容器本体の上面に開設された開口部を閉塞すべく、該容器本体に対して着脱可能に締結される天蓋に、液体還元剤の残量を検出する水位計の基部と、液体還元剤の濃度を検出する濃度計の基部と、前記水位計及び濃度計の基部から垂下された検出部を囲みつつ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と、を夫々取り付けると共に、液体還元剤の供給口及び戻り口を夫々形成し、前記天蓋に対して水位計，濃度計，熱交換器並びに液体還元剤の供給口及び戻り口を一体化したことを特徴とする。   Therefore, in the first aspect of the invention, the remaining amount of the liquid reducing agent is detected on the canopy that is detachably fastened to the container body so as to close the opening formed on the upper surface of the container body. Liquid reduction by circulating a heat medium that uses the engine as a heat source while enclosing the base of the water level meter, the base of the concentration meter that detects the concentration of the liquid reducing agent, and the detection unit suspended from the base of the water level meter and the concentration meter And a heat exchanger for exchanging heat with the agent, respectively, and forming a supply port and a return port for the liquid reducing agent, respectively, with respect to the canopy, a water level meter, a concentration meter, a heat exchanger, and liquid reduction The agent supply port and the return port are integrated.

請求項２記載の発明では、前記天蓋は、熱伝導特性が良好な金属プレートからなることを特徴とする。
請求項３記載の発明では、前記熱交換器は、前記熱媒体の入口と出口とを相互接続する略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金属製の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 canopy is made of a metal plate having good heat conduction characteristics.
The invention according to claim 3 is characterized in that the heat exchanger is formed by bending and forming a substantially U-shaped tube material interconnecting the inlet and outlet of the heat medium.
The invention according to claim 4 is characterized in that the distal end bent portion of the tube material is supported by a metal bracket fixed to the canopy.

請求項５記載の発明では、前記天蓋には、上方へと向かって延びる部位を有する管状の開放口が形成されると共に、該開放口には、先端部が略鉛直下方を向いた状態で配設されるブリーザホースの基端部が接続されることを特徴とする。
請求項６記載の発明では、前記開放口は、前記容器本体の横断面の略中央に対応した位置に形成されたことを特徴とする。 In the invention according to claim 5, the canopy is formed with a tubular open port having a portion extending upward, and the open port is arranged in a state where the tip portion is directed substantially vertically downward. The base end part of the breather hose provided is connected.
The invention according to claim 6 is characterized in that the opening is formed at a position corresponding to substantially the center of the transverse section of the container body.

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及び濃度計を点検整備するときには、容器本体の上面に開設された開口部を閉塞する天蓋を取り外し、熱交換器が容器本体に干渉しないように上方に向けて引く抜く。このとき、天蓋には、熱交換器に加えて水位計及び濃度計の基部が夫々取り付けられているため、これらも同時に取り外すことができる。そして、水位計及び濃度計の点検整備が完了したならば、容器本体の上面に開設された開口部から熱交換器を挿入し、容器本体の上面に天蓋を締結する。従って、天蓋及びこれと一体化されている水位計などは、容器本体の内壁に固定されていないことから、水位計及び濃度計の点検整備に際して、還元剤容器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。   According to the first aspect of the present invention, when the water level meter and the concentration meter attached to the reducing agent container are inspected and maintained, the canopy that closes the opening formed on the upper surface of the container body is removed, and the heat exchanger is Pull upwards so as not to interfere with the body. At this time, since the base of the water level meter and the concentration meter is attached to the canopy in addition to the heat exchanger, these can also be removed at the same time. When the inspection and maintenance of the water level meter and the concentration meter is completed, the heat exchanger is inserted from the opening formed in the upper surface of the container body, and the canopy is fastened to the upper surface of the container body. Therefore, since the canopy and the water level gauge integrated with the canopy are not fixed to the inner wall of the container body, it is not necessary to disassemble the reducing agent container when checking and maintaining the water level gauge and the concentration meter. Can be greatly reduced.

請求項２記載の発明によれば、天蓋は熱伝達特性が良好な金属プレートから構成されているため、熱媒体の入口から天蓋にその熱が伝達され易く、天蓋が短時間かつ均一に昇温し、液体還元剤の供給口及び戻り口の周囲を加熱する。このため、液体還元剤の供給口及び戻り口の周囲に存在する液体還元剤の凍結を防止することができる。
請求項３記載の発明によれば、熱交換器は熱媒体の入口と出口とを相互接続する略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。 According to the second aspect of the present invention, since the canopy is made of a metal plate having good heat transfer characteristics, the heat can be easily transferred from the entrance of the heat medium to the canopy, and the canopy is heated uniformly in a short time. Then, the periphery of the liquid reducing agent supply port and the return port is heated. For this reason, freezing of the liquid reducing agent existing around the supply port and the return port of the liquid reducing agent can be prevented.
According to the third aspect of the present invention, the heat exchanger is formed by bending and forming a substantially U-shaped tube material interconnecting the inlet and outlet of the heat medium, so that the total length in the reducing agent container is long. Thus, heat exchange with the liquid reducing agent can be performed efficiently.

請求項４記載の発明によれば、熱交換器を構成する管材の先端屈曲部は、天蓋に固定されたブラケットにより支持されるため、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。また、熱交換器の熱は、その先端屈曲部から金属製のブラケットを介して天蓋に伝達されるため、天蓋は熱媒体の入口からの熱に加えて、ブラケットを介して伝達された熱により昇温し、液体還元剤の供給口及び戻り口の周囲を加熱する。このため、液体還元剤の供給口及び戻り口に接続される配管が外気に晒されたとしても、その内部の液体還元剤の凍結を効率的に防止することができる。   According to invention of Claim 4, since the front-end | tip bending part of the pipe material which comprises a heat exchanger is supported by the bracket fixed to the canopy, it will be supported and fixed at three points with respect to the canopy, Mounting rigidity can be increased. In addition, the heat of the heat exchanger is transmitted to the canopy from the bent portion at the tip through the metal bracket, so that the canopy is heated by the heat transmitted through the bracket in addition to the heat from the inlet of the heat medium. The temperature is raised and the surroundings of the liquid reducing agent supply port and the return port are heated. For this reason, even if the piping connected to the supply port and the return port of the liquid reducing agent is exposed to the outside air, it is possible to efficiently prevent the liquid reducing agent in the interior from being frozen.

請求項５記載の発明によれば、容器本体内部の上部空間は、開放口及びブリーザホースを介して大気開放される。このため、雰囲気温度の上昇などにより、容器本体の上部空間に存在する空気が膨張しても、これが大気中に放出されるので、容器内の圧力上昇を抑制することができる。また、開放口は天蓋と一体化されているため、その開口に還元剤成分が析出されたとしても、水位計及び濃度計の点検整備を行うときに、これを容易に除去することができる。さらに、開放口は上方へと向かって延びる部位を有すると共に、ブリーザホースの先端部は略鉛直下方を向いているので、液体還元剤から発生した気体成分のうち空気より比重の小さいものはブリーザホースの鉛直上部内に溜まり、大気中に放出されることを抑制できる。   According to the fifth aspect of the present invention, the upper space inside the container body is opened to the atmosphere via the opening and the breather hose. For this reason, even if the air which exists in the upper space of a container main body expand | swells by raise of atmospheric temperature etc., since this is discharge | released in air | atmosphere, the pressure rise in a container can be suppressed. In addition, since the opening is integrated with the canopy, even if the reducing agent component is deposited in the opening, it can be easily removed when checking and maintaining the water level meter and the concentration meter. Furthermore, since the opening has a portion extending upward, and the tip of the breather hose faces substantially vertically downward, the gas component generated from the liquid reducing agent has a specific gravity smaller than air. It can be restrained from being collected in the vertical upper part of the gas and being released into the atmosphere.

請求項６記載の発明によれば、液体還元剤が揺れ動いたとしても、これが開放口まで到達し難くなり、ブリーザホースを介して液体還元剤がそのまま排出されることを防止できる。   According to the sixth aspect of the present invention, even if the liquid reducing agent sways, it becomes difficult for the liquid reducing agent to reach the opening, and the liquid reducing agent can be prevented from being discharged as it is through the breather hose.

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を触媒還元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 the overall configuration of an exhaust purification device that uses an aqueous urea solution as a liquid reducing agent and purifies NOx contained in engine exhaust by a catalytic reduction 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. A NOx reduction catalyst 20 that reduces and purifies NOx with ammonia obtained by hydrolyzing the urea aqueous solution, and an ammonia oxidation catalyst 22 that oxidizes 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 with 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開設され、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。ここで、天蓋３６は、熱伝達特性が良好な金属プレートから構成することが望ましい。   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. In addition, an opening (not shown) is formed on the upper surface of the container body 24A, and the canopy 36 is detachably fastened by a plurality of bolts 34 as fastening members so as to close the opening. Here, it is desirable that the canopy 36 is composed of a metal plate having good heat transfer characteristics.

天蓋３６の上面には、その長手方向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、内部の上部空間を大気開放する開放口３６Ｅと、が夫々形成される。ここで、開放口３６Ｅは、上方へと向かって延びる部位を有する管状に形成され、図３に示すように、満タン液面レベル近傍において先端部３７Ａが略鉛直下方を向いた状態で配設されるブリーザホース３７の基端部３７Ｂが接続される。また、天蓋３６には、その長手方向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 in the longitudinal direction, an inlet 36A and an outlet 36B of engine cooling water as a heat medium having the engine as a heat source, a supply port 36C and a return port 36D of an aqueous urea solution, An opening 36E that opens the internal upper space to the atmosphere is formed. Here, the open port 36E is formed in a tubular shape having a portion extending upward, and as shown in FIG. 3, the tip portion 37A is disposed substantially vertically downward near the full liquid level. The base end portion 37B of the breather hose 37 to be connected is connected. Further, the canopy 36 has a base 38A of a water level meter 38 for detecting the remaining amount of the urea aqueous solution, a base 40A of a concentration meter 40 for detecting the concentration of the urea aqueous solution, from the center portion in the longitudinal direction to the other end portion, Are fastened by bolts 42 as fastening members. 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 concentration meter 40 detects the concentration of the urea aqueous solution from the temperature transfer characteristics between two spaced points, and the detection unit 40B is located 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と出口３６Ｂとは、容器本体２４Ａ内に配設される熱交換器４４により相互接続される。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に固定された金属製のブラケット４６により支持させたものである。このように、エンジン冷却水の入口３６Ａと出口３６Ｂとを相互接続する略Ｕ字形状の管材を屈曲形成して熱交換器４４を構成すれば、液体還元剤容器内における熱交換器４４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。また、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 interconnected by a heat exchanger 44 disposed in the container body 24A. The heat exchanger 44 is formed by bending a substantially U-shaped tube 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 bending portion 44A is a metal fixed to the canopy 36. It is supported by a bracket 46 made of metal. Thus, if the heat exchanger 44 is formed by bending and forming a substantially U-shaped tube material interconnecting the inlet 36A and the outlet 36B of the engine coolant, the entire length of the heat exchanger 44 in the liquid reducing agent container. Thus, heat exchange can be efficiently performed with the liquid reducing agent. Further, 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.

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５０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 50 whose upper surface is opened 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き抜く。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などが一体化されているので、これらも同時に取り外すことができる。その後、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。このような点検整備を行うときには、天蓋３６及びこれと一体化されている水位計３８及び濃度計４０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。   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, in addition to the heat exchanger 44, the water level meter 38, the concentration meter 40, and the like are integrated with the canopy 36, and these can be removed at the same time. Thereafter, 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 in the upper surface of the container main body 24A, and the canopy 36 is fastened to the upper surface by the bolts 34. When performing such inspection and maintenance, the canopy 36 and the water level meter 38 and the concentration meter 40 integrated with the canopy 36 and the concentration meter 40 are not fixed to the inner wall of the container main body 24A. Therefore, it is necessary to disassemble the reducing agent container 24. The man-hours can be greatly reduced.

一方、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。また、熱交換器４４の熱は、その先端屈曲部４４Ａから金属製のブラケット４６を介して天蓋３６に伝達される。このため、天蓋３６は、エンジン冷却水の入口３６Ａからの熱に加えて、ブラケット４６を介して伝達された熱により昇温し、尿素水溶液の供給口３６Ｃ及び戻り口３６Ｄの周囲を加熱する。従って、これらに接続される配管が外気に晒されたとしても、その内部の尿素水溶液が凍結することを効率的に防止することができる。   On the other hand, the bent end portion 44A of the pipe 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. Further, the heat of the heat exchanger 44 is transmitted to the canopy 36 through the metal bracket 46 from the tip bent portion 44A. Therefore, the canopy 36 is heated by the heat transmitted through the bracket 46 in addition to the heat from the inlet 36A of the engine cooling water, and the surroundings of the urea aqueous solution supply port 36C and the return port 36D are heated. Therefore, even if the pipes connected to these are exposed to the outside air, it is possible to efficiently prevent the urea aqueous solution therein from freezing.

また、天蓋３６に形成された開放口３６Ｅには、先端部３７Ａが略鉛直下方を向いた状態で配設されるブリーザホース３７の基端部３７Ｂが接続されるため、還元剤容器２４内部の上部空間は、開放口３６Ｅ及びブリーザホース３７を介して大気開放される。このため、雰囲気温度の上昇などにより、還元剤容器２４の上部空間に存在する気体が膨張しても、これが大気中に放出されるので、容器内の圧力上昇を抑制することができる。ここで、上部空間の気体には、尿素水溶液の温度上昇により発生した微量のアンモニアが含まれる。しかし、開放口３６Ｅは上方へと向かって延びる部位を有すると共に、ブリーザホース３７の先端部３７Ａは略鉛直下方を向いているので、空気より比重の小さいアンモニアはブリーザホース３７の鉛直上部内に溜まり、大気中に放出されることが抑制される。さらに、開放口３６Ｅは天蓋３６と一体化されているため、その開口に尿素が析出されたとしても、水位計３８及び濃度計４０の点検整備を行うときに、これを容易に除去することができる。   Further, since the base end portion 37B of the breather hose 37 disposed with the distal end portion 37A facing substantially vertically downward is connected to the opening 36E formed in the canopy 36, the inside of the reducing agent container 24 is connected. The upper space is opened to the atmosphere via the opening 36E and the breather hose 37. For this reason, even if the gas existing in the upper space of the reducing agent container 24 expands due to an increase in the atmospheric temperature or the like, the gas is released into the atmosphere, so that an increase in pressure in the container can be suppressed. Here, the gas in the upper space contains a small amount of ammonia generated by the temperature increase of the urea aqueous solution. However, the open port 36E has a portion extending upward, and the tip portion 37A of the breather hose 37 faces substantially vertically downward, so that ammonia having a specific gravity smaller than that of air accumulates in the vertical upper portion of the breather hose 37. , Being released into the atmosphere is suppressed. Furthermore, since the opening 36E is integrated with the canopy 36, even if urea is deposited in the opening, it can be easily removed when the water level meter 38 and the concentration meter 40 are inspected and maintained. it can.

還元剤容器２４を移動車両に搭載するときには、開放口３６Ｅを、容器本体２４Ａの横断面の略中央に対応した位置に形成することが望ましい。即ち、移動車両が走行するときには、還元剤容器２４には多方向に加速度が作用するため、尿素水溶液は、容器本体２４Ａの略中央を中心として揺れ動く。開放口３６Ｅを容器本体２４Ａの横断面の略中央に対応した位置に形成しておけば、尿素水溶液が揺れ動いたとしても、これが開放口３６Ｅの開口まで到達し難くなり、ブリーザホース３７を介して尿素水溶液がそのまま排出されることを防止できる。   When the reducing agent container 24 is mounted on a moving vehicle, it is desirable to form the opening 36E at a position corresponding to the approximate center of the cross section of the container body 24A. That is, when the moving vehicle travels, acceleration is applied to the reducing agent container 24 in multiple directions, so that the urea aqueous solution swings around the approximate center of the container body 24A. If the opening 36E is formed at a position corresponding to the approximate center of the cross section of the container main body 24A, even if the urea aqueous solution shakes, it becomes difficult to reach the opening of the opening 36E, and the breather hose 37 is used. The urea aqueous solution can be prevented from being discharged as it is.

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 ブリーザホースの接続状態を示し、（Ａ）は平面図、（Ｂ）は正面図The connection state of the breather hose is shown, (A) is a plan view, and (B) is a front view.

符号の説明Explanation of symbols

１０ エンジン
２４ 還元剤容器
２４Ａ 容器本体
３４ ボルト
３６ 天蓋
３６Ａ 入口
３６Ｂ 出口
３６Ｃ 供給口
３６Ｄ 戻り口
３７ ブリーザホース
３７Ａ 先端部
３７Ｂ 基端部
３８ 水位計
３８Ａ 基部
３８Ｂ 検出部
４０ 濃度計
４０Ａ 基部
４０Ｂ 検出部
４４ 熱交換器
４４Ａ 先端屈曲部
４６ ブラケット 10 Engine 24 Reductant Container 24A Container Body 34 Bolt 36 Canopy 36A Inlet 36B Outlet 36C Supply Port 36D Return Port 37 Breather Hose 37A Tip 37B Base End 38 Water Level Meter 38A Base 38B Detector 40 Densitometer 40A Base 40B Heat exchanger 44A Bend at tip 46 Bracket

Claims (6)

容器本体の上面に開設された開口部を閉塞すべく、該容器本体に対して着脱可能に締結される天蓋に、液体還元剤の残量を検出する水位計の基部と、液体還元剤の濃度を検出する濃度計の基部と、前記水位計及び濃度計の基部から垂下された検出部を囲みつつ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と、を夫々取り付けると共に、液体還元剤の供給口及び戻り口を夫々形成し、前記天蓋に対して水位計，濃度計，熱交換器並びに液体還元剤の供給口及び戻り口を一体化したことを特徴とする還元剤容器の構造。   In order to close the opening established on the upper surface of the container body, a canopy releasably fastened to the container body, a base of a water level meter for detecting the remaining amount of the liquid reducing agent, and the concentration of the liquid reducing agent Heat exchange for exchanging heat with a liquid reducing agent by circulating a heat medium having an engine as a heat source while enclosing the base part of the concentration meter for detecting water and the detection part suspended from the base of the water level meter and the concentration meter And a liquid reducing agent supply port and a return port, respectively, and a water level meter, a concentration meter, a heat exchanger, and a liquid reducing agent supply port and a return port are integrated with the canopy. The structure of the reducing agent container characterized by the above. 前記天蓋は、熱伝導特性が良好な金属プレートからなることを特徴とする請求項１記載の還元剤容器の構造。   The structure of the reducing agent container according to claim 1, wherein the canopy is made of a metal plate having good heat conduction characteristics. 前記熱交換器は、前記熱媒体の入口と出口とを相互接続する略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に記載の還元剤容器の構造。   3. The reducing agent container according to claim 1, wherein the heat exchanger is formed by bending a substantially U-shaped tube material interconnecting an inlet and an outlet of the heat medium. Structure. 前記管材の先端屈曲部は、前記天蓋に固定された金属製の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記載の還元剤容器の構造。   The structure of the reducing agent container according to claim 3, wherein the bent end portion of the tube material is supported by a metal bracket fixed to the canopy. 前記天蓋には、上方へと向かって延びる部位を有する管状の開放口が形成されると共に、該開放口には、先端部が略鉛直下方を向いた状態で配設されるブリーザホースの基端部が接続されることを特徴とする請求項１〜請求項４のいずれか１つに記載の還元剤容器の構造。   The canopy is formed with a tubular open port having a portion extending upward, and a base end of a breather hose disposed at the open port with a distal end portion facing substantially vertically downward. The structure of the reducing agent container according to any one of claims 1 to 4, wherein the parts are connected. 前記開放口は、前記容器本体の横断面の略中央に対応した位置に形成されたことを特徴とする請求項５記載の還元剤容器の構造。   The structure of the reducing agent container according to claim 5, wherein the opening is formed at a position corresponding to a substantially center of a transverse section of the container body.
JP2004303615A 2004-03-29 2004-10-19 Reducing agent container structure Expired - Fee Related JP3686667B1 (en)

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JP2004303615A JP3686667B1 (en) 2004-04-27 2004-10-19 Reducing agent container structure
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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US7954312B2 (en) * 2007-05-09 2011-06-07 Ford Global Technologies, Llc Approach for detecting reductant availability and make-up
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US8413431B2 (en) * 2009-06-30 2013-04-09 Eaton Corporation Tank assembly
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