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JP5485682B2 - Open air structure of liquid reducing agent expansion tank - Google Patents
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JP5485682B2 - Open air structure of liquid reducing agent expansion tank - Google Patents

Open air structure of liquid reducing agent expansion tank Download PDF

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JP5485682B2
JP5485682B2 JP2009292963A JP2009292963A JP5485682B2 JP 5485682 B2 JP5485682 B2 JP 5485682B2 JP 2009292963 A JP2009292963 A JP 2009292963A JP 2009292963 A JP2009292963 A JP 2009292963A JP 5485682 B2 JP5485682 B2 JP 5485682B2
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Prior art keywords
tank
urea water
air release
reducing agent
liquid reducing
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JP2011132891A (en
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和宏 小平
俊之 関
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Hino Motors Ltd
Isuzu Motors Ltd
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Hino Motors Ltd
Isuzu Motors Ltd
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Priority to JP2009292963A priority Critical patent/JP5485682B2/en
Priority to CN201080048467.3A priority patent/CN102639830B/en
Priority to PCT/JP2010/073166 priority patent/WO2011078237A1/en
Publication of JP2011132891A publication Critical patent/JP2011132891A/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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • 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
    • F01N2610/14—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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F01N2610/1413—Inlet and filling arrangements therefore
    • 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
    • F01N2610/1466—Means for venting air out of conduits or tanks
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

本発明は、液体還元剤増設タンクの大気開放構造に関するものである。   The present invention relates to an atmosphere opening structure of a liquid reducing agent expansion tank.

車両に搭載されるエンジン、例えばディーゼルエンジンの排気ガス中のＮＯｘを浄化するために排気ガス浄化装置の一つとして、例えば選択還元触媒（ＳＣＲ）装置が開発されている（例えば、特許文献１，２参照）。このＳＣＲ装置は、液体還元剤である例えば尿素水をＳＣＲ装置の排気ガス上流に供給し、排気ガスの熱で尿素を加水分解してアンモニアを生成し、このアンモニアによってＳＣＲ触媒上でＮＯｘを還元して浄化するものである。   For example, a selective reduction catalyst (SCR) device has been developed as one of exhaust gas purification devices for purifying NOx in an exhaust gas of an engine mounted on a vehicle, for example, a diesel engine (for example, Patent Document 1, Patent Document 1). 2). This SCR device supplies, for example, urea water, which is a liquid reducing agent, upstream of the exhaust gas of the SCR device, hydrolyzes urea with the heat of the exhaust gas to generate ammonia, and this ammonia reduces NOx on the SCR catalyst. To purify it.

図３に示すように例えばディーゼルエンジン等のエンジン１の排気マニフォールド２には排気管３が接続されており、この排気管３の途中には排気ガス浄化装置の一つであるＮＯｘ還元用のＳＣＲ装置（ＳＣＲユニットともいう。）４が接続されていると共に、このＳＣＲ装置４の排気ガス上流には液体還元剤である尿素水５をＳＣＲ装置４のＳＣＲ触媒６に供給するための噴射ノズル７を備えた尿素水供給管部８が接続されている。これらＳＣＲ装置４及び尿素水供給管部８を排気管３の途中に取付けるために、前記排気管３は前部３ａと後部３ｂに分割されている。   As shown in FIG. 3, an exhaust pipe 3 is connected to an exhaust manifold 2 of an engine 1 such as a diesel engine, for example, and an NOx reduction SCR that is one of exhaust gas purifying devices is disposed in the middle of the exhaust pipe 3. A device (also referred to as an SCR unit) 4 is connected, and an injection nozzle 7 for supplying urea water 5 as a liquid reducing agent to the SCR catalyst 6 of the SCR device 4 upstream of the exhaust gas of the SCR device 4. The urea water supply pipe part 8 provided with is connected. In order to attach the SCR device 4 and the urea water supply pipe portion 8 in the middle of the exhaust pipe 3, the exhaust pipe 3 is divided into a front portion 3a and a rear portion 3b.

この尿素水供給管部８の噴射ノズル７には、尿素水供給パイプ９を介して尿素水貯蔵タンク（液体還元剤貯蔵タンク、単にタンクともいう。）１０が接続されている。この尿素水貯蔵タンク１０は、尿素水５を尿素水供給パイプ９を介して噴射ノズル７に圧送するように構成されている。   A urea water storage tank (liquid reducing agent storage tank, also simply referred to as a tank) 10 is connected to the injection nozzle 7 of the urea water supply pipe section 8 via a urea water supply pipe 9. The urea water storage tank 10 is configured to pump the urea water 5 to the injection nozzle 7 through the urea water supply pipe 9.

前記タンク１０の種類としては、図４（ａ）に示すような容量の小さいシングルタンク１０Ａと、図５に示すような容量の大きい増設タンク１０Ｂとがある。この増設タンク１０Ｂは、メインタンク１０ｘとサブタンク１０ｙとを連通管１１で接続して構成されている。これら何れのタイプのタンクにおいても、タンク内の圧力を調整するためにタンク内を大気に開放するための大気開放ホース１２がタンクの頂部１３に取付けられている。なお、タンクの頂部１３の中央部には、大気開放ホース１２と連通した大気開放ノズル１４が尿素水５の液面に臨んで突設されており、この大気開放ノズル１２を挟んで一側に尿素水供給パイプ９が配置され、他側に尿素水戻り管１５が配置されている。尿素水戻り管１５はＳＣＲ装置４から余剰尿素水をタンク内に戻すものである。   The types of the tank 10 include a single tank 10A having a small capacity as shown in FIG. 4A and an expansion tank 10B having a large capacity as shown in FIG. The additional tank 10B is configured by connecting a main tank 10x and a sub tank 10y through a communication pipe 11. In any of these types of tanks, an air release hose 12 for opening the inside of the tank to the atmosphere in order to adjust the pressure in the tank is attached to the top 13 of the tank. An air release nozzle 14 communicating with the air release hose 12 is provided at the center of the top portion 13 of the tank so as to face the liquid surface of the urea water 5. A urea water supply pipe 9 is disposed, and a urea water return pipe 15 is disposed on the other side. The urea water return pipe 15 returns excess urea water from the SCR device 4 into the tank.

シングルタンク１０Ａの場合、大気開放ホース１２の大気開放ノズル１４がタンク中央に位置しているため、傾斜した路面によりタンクが所定角度傾斜したり、急発進又は急制動により図４（ｂ）に示すようにタンク内の液面５ａが傾斜したとしても大気開放ホース１２から尿素水が漏れることはない。   In the case of the single tank 10A, since the air release nozzle 14 of the air release hose 12 is located at the center of the tank, the tank is inclined at a predetermined angle by an inclined road surface, or suddenly started or suddenly braked, as shown in FIG. Thus, even if the liquid level 5a in the tank is inclined, urea water does not leak from the air release hose 12.

特開２０００−２７６２７号公報JP 2000-27627 A 特開２００５−８３２２３号公報JP 2005-83223 A

しかしながら、増設タンク１０Ｂの場合、タンクが傾斜したり〔図６（ａ）参照〕、液面５ａが傾斜したり〔図６（ｂ）参照〕した場合、一方のタンク１０ｙから連通管１１を通って他方のタンク１０ｘに尿素水５が移動し、その結果、尿素水５が移動した側のタンクの大気開放ホース１２から尿素水が溢れてしまう虞がある。   However, in the case of the expansion tank 10B, when the tank is inclined (see FIG. 6 (a)) or the liquid level 5a is inclined (see FIG. 6 (b)), the tank 10y passes through the communication pipe 11. Then, the urea water 5 moves to the other tank 10x, and as a result, the urea water may overflow from the atmosphere release hose 12 of the tank on the side where the urea water 5 has moved.

この対策として、図７に示すようにタンク同士を繋ぐ連通管１１にコック１６を設け、タンク間の尿素水の行き来を遮断したり、或いは大気開放ホース１２の高さｔを高くして大気開放ホース１２から尿素水が溢れないようにする必要があった。   As a countermeasure, as shown in FIG. 7, a cock 16 is provided in the communication pipe 11 that connects the tanks to block the passage of urea water between the tanks, or the height t of the air release hose 12 is increased to release the air. It was necessary to prevent the urea water from overflowing from the hose 12.

本発明は、前記事情を考慮してなされたものであり、大気開放ホースから液体還元剤が漏れるのを防止できる液体還元剤増設タンクの大気開放構造を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide an atmosphere opening structure for a liquid reducing agent expansion tank that can prevent the liquid reducing agent from leaking from the atmosphere opening hose.

前記目的を達成するために、本発明は、液体還元剤を貯留するメインタンクとサブタンクとを連通管を介して接続した増設タンクの各タンク内をタンク頂部に設けた大気開放ホースにより大気開放する構造であって、前記大気開放ホースが一方のタンクの頂部から他方のタンクの頂部に向かって互いに延出された延出部と、該延出部の先端から他方のタンクの側面に沿って下方に屈曲されて垂下された垂下部とを有していることを特徴とする。   In order to achieve the above-mentioned object, the present invention releases the atmosphere in each tank of an additional tank in which a main tank storing a liquid reducing agent and a sub tank are connected via a communication pipe by an air release hose provided at the top of the tank. A structure in which the air release hose extends from the top of one tank toward the top of the other tank, and extends downward from the tip of the extension along the side of the other tank. And a hanging portion that is bent and drooped.

前記大気開放ホースの延出部の先端が、他方のタンクの頂部よりも高い位置に設定されていることが好ましい。   It is preferable that the tip of the extended portion of the air release hose is set at a position higher than the top of the other tank.

前記連通管の内径が、前記大気開放ホースの内径と同じか又はそれ以下に設定されていることが好ましい。   It is preferable that an inner diameter of the communication pipe is set to be equal to or less than an inner diameter of the air release hose.

本発明によれば、大気開放ホースから液体還元剤が漏れるのを防止できる。   According to the present invention, it is possible to prevent the liquid reducing agent from leaking from the open air hose.

本発明に係る液体還元剤増設タンクの大気開放構造の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the air release structure of the liquid reducing agent expansion tank which concerns on this invention. 増設タンクが傾斜した状態を示す断面図である。It is sectional drawing which shows the state in which the expansion tank inclined. 選択還元触媒装置の一例を示す図である。It is a figure which shows an example of a selective reduction catalyst apparatus. （ａ）はシングルタンク内の尿素水が水平の場合を示す図で、（ｂ）は尿素水が傾斜した場合を示す図である。(A) is a figure which shows the case where the urea water in a single tank is horizontal, (b) is a figure which shows the case where urea water inclines. 増設タンクを示す図である。It is a figure which shows an expansion tank. （ａ）は増設タンクが傾斜した場合を示す図で、（ｂ）は尿素水が傾斜した場合を示す図である。(A) is a figure which shows the case where an expansion tank inclines, (b) is a figure which shows the case where urea water inclines. 増設タンクの大気開放ホースからの尿素水の漏れを防止する対策例を示す図である。It is a figure which shows the example of a countermeasure which prevents the leakage of the urea water from the air release hose of an expansion tank.

以下に、本発明を実施するための形態を添付図面に基いて詳述する。   EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

図１ないし図２において、１０Ｂは液体還元剤例えば尿素水５を貯留する増設タンクで、この増設タンク１０Ｂはエンジン例えばディーゼルエンジンの排気ガス中のＮＯｘを浄化すべく排気管に取付けられる選択還元触媒（ＳＣＲ）装置に尿素水を供給するために車両に搭載される。   1 and 2, reference numeral 10B denotes an expansion tank for storing a liquid reducing agent such as urea water 5. The expansion tank 10B is a selective reduction catalyst attached to an exhaust pipe for purifying NOx in exhaust gas of an engine such as a diesel engine. (SCR) Mounted on a vehicle to supply urea water to the device.

前記増設タンク１０Ｂは、メインタンク１０ｘにサブタンク１０ｙを連通管１１を介して接続して構成されている。前記連通管１１は、メインタンク１０ｘの底部側内部とサブタンク１０ｙの底部側内部とを連通すべく両タンク間に水平に介設されている。この場合、メインタンク１０ｘ及びサブタンク１０ｙのそれぞれの底部側一側部にノズル（図示省略）を突設し、両ノズルに対して連通管１１の両端部を嵌合接続したものであってもよい。なお、メインタンク１０ｘ、サブタンク１０ｙ及び連通管１１は、尿素水に対して耐食性を有する材料例えばプラスチック製或いはステンレス製であることが好ましい。   The expansion tank 10B is configured by connecting a sub tank 10y to a main tank 10x via a communication pipe 11. The communication pipe 11 is interposed horizontally between the tanks so as to communicate the inside of the bottom of the main tank 10x and the inside of the bottom of the sub tank 10y. In this case, a nozzle (not shown) may be provided on one side of the bottom side of each of the main tank 10x and the sub tank 10y, and both ends of the communication pipe 11 may be fitted and connected to both nozzles. . The main tank 10x, the sub tank 10y, and the communication pipe 11 are preferably made of a material having corrosion resistance against urea water, for example, plastic or stainless steel.

前記メインタンク１０ｘの頂部１３にはタンク内の圧力を調整するためにタンク内を大気に開放するための大気開放ホース１２ｘが取付けられている。なお、メインタンク１０ｘの頂部１３の中央部には、大気開放ホース１２ｘと連通した大気開放ノズル１４が尿素水５の液面に臨んで下方に突設されており、この大気開放ノズル１４を挟んで一側には尿素水供給パイプ９が配置され、他側にはＳＣＲ装置から余剰尿素水をタンク内に戻すための尿素水戻り管１５が配置されている。なお、図１において、メインタンク１０ｘの上部から上方の尿素水供給パイプ９及び尿素水戻り管１５は図示省略されている。   An air release hose 12x for opening the inside of the tank to the atmosphere is attached to the top portion 13 of the main tank 10x in order to adjust the pressure in the tank. At the center of the top 13 of the main tank 10x, an air release nozzle 14 that communicates with the air release hose 12x faces the liquid surface of the urea water 5 and protrudes downward. The urea water supply pipe 9 is disposed on one side, and the urea water return pipe 15 is disposed on the other side for returning excess urea water from the SCR device into the tank. In FIG. 1, the urea water supply pipe 9 and the urea water return pipe 15 that are above from the upper part of the main tank 10 x are not shown.

前記メインタンク１０ｘの頂部１３と同様に、サブタンク１０ｙの頂部１３にはタンク内の圧力を調整するためにタンク内を大気に開放するための大気開放ホース１２ｙが取付けられている。なお、サブタンク１０ｙの頂部１３の中央部には、大気開放ホース１２ｙと連通した大気開放ノズル１４が尿素水５の液面に臨んで下方に突設されており、この大気開放ノズル１４を挟んで一側には尿素水供給パイプ９が設けられ、他側にはＳＣＲ装置からの余剰尿素水をタンク内に戻すための尿素水戻り管１５が配置されている。   Similarly to the top portion 13 of the main tank 10x, an air release hose 12y for opening the inside of the tank to the atmosphere is attached to the top portion 13 of the sub tank 10y in order to adjust the pressure in the tank. At the center of the top portion 13 of the sub tank 10y, an air release nozzle 14 communicating with the air release hose 12y is projected downward facing the liquid surface of the urea water 5, and the air release nozzle 14 is sandwiched therebetween. A urea water supply pipe 9 is provided on one side, and a urea water return pipe 15 for returning surplus urea water from the SCR device into the tank is disposed on the other side.

そして、前記メインタンク１０ｘの大気開放ホース１２ｘは、メインタンク１０ｘの頂部１３からサブタンク１０ｙの頂部１３に向かって水平に若しくは略水平に又は小角度で上向きに傾斜した状態で延出された延出部ｆと、該延出部ｆの先端から屈曲部ｃを介してサブタンク１０ｙの側面（好ましくは外側面）に沿うように下方に屈曲されて垂下された垂下部ｇとを有している。ヘッド（水頭）差ｈを稼ぐために（図２参照）、前記大気開放ホース１２ｘの延出部ｆの先端が、他方のタンクの頂部１３よりも高い位置に設定されていることが好ましい。   The air release hose 12x of the main tank 10x extends from the top portion 13 of the main tank 10x toward the top portion 13 of the sub tank 10y in a state of being inclined horizontally, substantially horizontally, or upward at a small angle. A portion f, and a hanging portion g that is bent downward and bent downward along the side surface (preferably the outer surface) of the sub tank 10y from the tip of the extending portion f via the bent portion c. In order to earn a head (water head) difference h (see FIG. 2), it is preferable that the tip of the extended portion f of the atmosphere release hose 12x is set at a position higher than the top portion 13 of the other tank.

前記サブタンク１０ｙの大気開放ホース１２ｙは、サブタンク１０ｙの頂部１３からメインタンク１０ｘの頂部１３に向かって延出された延出部ｆと、該延出部ｆの先端から屈曲部ｃを介してメインタンク１０ｘの側面に沿うように下方に屈曲されて垂下された垂下部ｇとを有している。   The air release hose 12y of the sub tank 10y includes an extension part f extending from the top part 13 of the sub tank 10y toward the top part 13 of the main tank 10x, and a main part from the tip of the extension part f via the bent part c. And a hanging portion g bent downward and drooping along the side surface of the tank 10x.

前記垂下部ｇの下端が大気に開口している。垂下部ｇを有するのは、異物の進入を抑制ないし防止するためである。   The lower end of the hanging part g is open to the atmosphere. The hanging portion g is provided to suppress or prevent the entry of foreign matter.

メインタンク１０ｘとサブタンク１０ｙ間の間隔ｋは所定の間隔例えば４９０ｍｍ又は４０ｍｍに設定されている。前記間隔ｋが大きいほどヘッド差ｈを稼ぐことができるが、逆に設置スペースが大きくなってしまうため、設置スペースを考慮して前記長さが設定されている。   An interval k between the main tank 10x and the sub tank 10y is set to a predetermined interval, for example, 490 mm or 40 mm. The larger the gap k, the more the head difference h can be gained. However, since the installation space increases, the length is set in consideration of the installation space.

傾斜した路面によりタンクが所定角度θ傾斜したり（図２参照）、或いは急発進又は急制動によりにタンク内の液面５ａが傾斜したりした際のタンク間の尿素水５の移動量を抑制するために、前記連通管１１の内径は、前記大気開放ホース１２ｘ，１２ｙの内径と同じか又はそれ以下に設定されていることが好ましい。   The amount of movement of the urea water 5 between the tanks is suppressed when the tank is inclined by a predetermined angle θ due to the inclined road surface (see FIG. 2) or the liquid level 5a in the tank is inclined due to sudden start or sudden braking. In order to do so, it is preferable that the inner diameter of the communication pipe 11 is set to be equal to or less than the inner diameter of the atmosphere release hoses 12x and 12y.

以上の構成からなる尿素水増設タンクの大気開放構造によれば、メインタンク１０ｘとサブタンク１０ｙとを連通管１１を介して接続した増設タンク１０Ｂの各タンク１０ｘ，１０ｙ内をタンク頂部１３に設けた大気開放ホース１２ｘ，１２ｙにより大気開放する構造であって、前記大気開放ホース１２ｘ，１２ｙが一方のタンクの頂部１３から他方のタンクの頂部１３に向かって互いに延出された延出部ｆと、該延出部ｆの先端から他方のタンクの側面に沿って下方に屈曲されて垂下された垂下部ｇとを有しているため、簡単な構成で大気開放ホース１２ｘ，１２ｙから尿素水が漏れるのを防止することができる。   According to the air release structure of the urea water expansion tank having the above configuration, the tank tops 13 are provided in the tanks 10x and 10y of the expansion tank 10B in which the main tank 10x and the sub tank 10y are connected via the communication pipe 11. An air release hose 12x, 12y that is open to the atmosphere, the air release hoses 12x, 12y extending from the top 13 of one tank toward the top 13 of the other tank; Since it has a drooping portion g bent downward from the tip of the extension portion f along the side surface of the other tank, the urea water leaks from the atmosphere release hoses 12x and 12y with a simple configuration. Can be prevented.

また、前記大気開放ホース１２ｘ，１２ｙの延出部ｆの先端が、他方のタンクの頂部１３よりも高い位置に設定されているため、ヘッド差ｈを更に稼ぐことができ、更に漏れにくくすることができる。   In addition, since the tip of the extended portion f of the air release hose 12x, 12y is set at a position higher than the top portion 13 of the other tank, the head difference h can be further increased and leakage is further prevented. Can do.

更に、前記連通管１１の内径が、前記大気開放ホース１２ｘ，１２ｙの内径と同じか又はそれ以下に設定されているため、傾斜した路面によりタンクが傾斜したり、或いは急発進又は急制動によりにタンク内の液面５ａが傾斜したりした際のタンク間の尿素水の移動量を抑制することができ、大気開放ホース１２ｘ，１２ｙから尿素水を更に漏れにくくすることができる。   Further, since the inner diameter of the communication pipe 11 is set to be equal to or less than the inner diameter of the atmosphere release hose 12x, 12y, the tank is inclined by an inclined road surface, or suddenly started or suddenly braked. The amount of urea water transferred between the tanks when the liquid level 5a in the tank is inclined can be suppressed, and the urea water can be further prevented from leaking from the air release hoses 12x and 12y.

以上、本発明の実施の形態を図面により詳述してきたが、本発明は前記実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲での種々の設計変更が可能である。   The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. .

５ 尿素水（液体還元剤）
１０Ｂ 増設タンク
１０ｘ メインタンク
１０ｙ サブタンク
１２ｘ、１２ｙ 大気開放ホース
ｆ 延出部
ｇ 垂下部 5 Urea water (liquid reducing agent)
10B Expansion tank 10x Main tank 10y Sub tank 12x, 12y Air release hose f Extension part g Hanging part

Claims (3)

液体還元剤を貯留するメインタンクとサブタンクとを連通管を介して接続した増設タンクの各タンク内をタンク頂部に設けた大気開放ホースにより大気開放する構造であって、前記大気開放ホースが一方のタンクの頂部から他方のタンクの頂部に向かって互いに延出された延出部と、該延出部の先端から他方のタンクの側面に沿って下方に屈曲されて垂下された垂下部とを有していることを特徴とする液体還元剤増設タンクの大気開放構造。   Each of the additional tanks connecting the main tank and the sub-tank for storing the liquid reducing agent via a communication pipe is opened to the atmosphere by an air release hose provided at the top of the tank, and the air release hose is one of the tanks. There are extended portions that extend from the top of the tank toward the top of the other tank, and a hanging portion that is bent downward from the tip of the extended portion along the side surface of the other tank. An open structure for the liquid reducing agent expansion tank. 前記大気開放ホースの延出部の先端が、他方のタンクの頂部よりも高い位置に設定されていることを特徴とする請求項１記載の液体還元剤増設タンクの大気開放構造。   The air release structure of the liquid reducing agent expansion tank according to claim 1, wherein a tip of the extension part of the air release hose is set at a position higher than a top part of the other tank. 前記連通管の内径が、前記大気開放ホースの内径と同じか又はそれ以下に設定されていることを特徴とする請求項１記載の液体還元剤増設タンクの大気開放構造。   2. The air release structure of the liquid reducing agent expansion tank according to claim 1, wherein an inner diameter of the communication pipe is set to be equal to or less than an inner diameter of the atmosphere release hose.
JP2009292963A 2009-12-24 2009-12-24 Open air structure of liquid reducing agent expansion tank Expired - Fee Related JP5485682B2 (en)

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CN201080048467.3A CN102639830B (en) 2009-12-24 2010-12-22 Atmospheric vent structure for expansion tank for liquid reducing agent
PCT/JP2010/073166 WO2011078237A1 (en) 2009-12-24 2010-12-22 Atmospheric vent structure for expansion tank for liquid reducing agent

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