JP2011117390A - Reducing agent tank - Google Patents

Reducing agent tank Download PDF

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JP2011117390A
JP2011117390A JP2009276725A JP2009276725A JP2011117390A JP 2011117390 A JP2011117390 A JP 2011117390A JP 2009276725 A JP2009276725 A JP 2009276725A JP 2009276725 A JP2009276725 A JP 2009276725A JP 2011117390 A JP2011117390 A JP 2011117390A
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reducing agent
tank body
tank
box
suction pipe
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JP5546839B2 (en
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Tomoyuki Ito
朝幸 伊藤
Yasuo Okamoto
泰雄 岡本
Tatsuo Masuko
達夫 益子
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Hino Motors Ltd
Isuzu Motors Ltd
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Hino Motors Ltd
Isuzu Motors Ltd
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    • 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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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve the thawing performance of a liquid reducing agent freezed in a reducing agent tank and correctly detect whether the liquid reducing agent in the reducing agent tank is thawed using a thermal sensor. <P>SOLUTION: The reducing agent tank comprises a tank body 11 for storing a liquid reducing agent, a suction pipe 12 mounted in the tank body 11 to suck the liquid reducing agent from the bottom of the tank body 11, a thermal sensor 13 for detecting the temperature of the liquid reducing agent in the tank body 11, a water level sensor for detecting the water level of the liquid reducing agent in the tank body 11, a concentration sensor for detecting the concentration of the liquid reducing agent in the tank body 11, a thawing media circulation pipe 14 which is mounted in the tank body 11 and through which the thawing media is circulated, a box-shaped partition wall member 15 which is disposed at the bottom of the tank body 11 to surround a part of the thawing media circulation pipe 14, wherein the suction port of the suction pipe 12 and the detection portion 22 of the thermal sensor 13 are disposed in the box-shaped partition wall member 15, and the detection portion of the water level sensor and the detection portion of the thermal sensor are disposed outside the box-shaped partition wall member 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、液体還元剤を貯蔵する還元剤タンクに係り、特に、タンク本体底部に解凍用媒体循環パイプを取り囲む箱型隔壁部材を設けた還元剤タンクに関する。   The present invention relates to a reducing agent tank for storing a liquid reducing agent, and more particularly to a reducing agent tank provided with a box-shaped partition member surrounding a thawing medium circulation pipe at the bottom of a tank body.

ＳＣＲシステムは尿素（尿素水）を還元剤として使用しエンジンの排気ガス中のＮＯｘ（窒素酸化物）を浄化するものである。尿素水は還元剤タンク（尿素タンク）に貯蔵されエンジンの排気管内に適宜供給されるが、極寒地では長時間の車両停車中等に尿素タンク内の尿素水が凍結してＳＣＲシステムの作動ができなくなることがある。そこで、エンジン冷却水によって尿素タンク内の尿素水を解凍するが、尿素水の解凍性能を高めるため尿素タンク底部にエンジン冷却水が循環するエンジン冷却水循環パイプを取り囲むように箱型隔壁部材を設け、その箱型隔壁部材内に熱を閉じ込めることによって吸込管入口やセンサ（水位センサ、濃度センサ）の検知部付近の凍結した尿素水を速やかに解凍する技術が開発されている（特許文献１参照）。   The SCR system uses urea (urea water) as a reducing agent to purify NOx (nitrogen oxides) in engine exhaust gas. Urea water is stored in a reducing agent tank (urea tank) and is appropriately supplied into the exhaust pipe of the engine. However, in extremely cold areas, the urea water in the urea tank freezes when the vehicle is stopped for a long time, and the SCR system can be operated. It may disappear. Therefore, the urea water in the urea tank is thawed by the engine cooling water, but a box-shaped partition member is provided so as to surround the engine cooling water circulation pipe in which the engine cooling water circulates at the bottom of the urea tank in order to improve the defrosting performance of the urea water. A technique has been developed for quickly thawing frozen urea water in the vicinity of the inlet of a suction pipe or a sensor (water level sensor, concentration sensor) by confining heat in the box-shaped partition wall member (see Patent Document 1). .

特許第３６８７９１８号公報Japanese Patent No. 3687918

しかし、特許文献１に記載の上記発明は吸込管入口、水位センサの検知部及び濃度センサの検知部を取り囲むように箱型隔壁部材を設けるものであり、これら三部品各々の熱容量分、解凍性能は低下する。また、本来ＳＣＲシステムを作動させるためには第一に吸込管周りの尿素水を解凍させるのが重要であり、上記三部品の解凍を同じレベルで考える上記発明に対し優先度を考慮した方が解凍性能はより高められる。   However, the above-mentioned invention described in Patent Document 1 is provided with a box-shaped partition member so as to surround the inlet of the suction pipe, the detection unit of the water level sensor and the detection unit of the concentration sensor. Will decline. In order to operate the SCR system, it is important to first defrost the urea water around the suction pipe, and it is better to consider the priority with respect to the above-mentioned invention in which thawing of the three parts is considered at the same level. The thawing performance is further enhanced.

また、特許文献１では尿素水が解凍されたかどうかの検知に関し示唆がないが、尿素水が解凍されたかどうかを検知してＳＣＲシステムを作動可能かどうか判断する必要がある。   Moreover, although there is no suggestion regarding detection of whether or not urea water has been thawed in Patent Document 1, it is necessary to determine whether or not the SCR system can be operated by detecting whether or not urea water has been thawed.

そこで、本発明の目的は、還元剤タンク内の凍結した液体還元剤の解凍性能をより高め、且つ温度センサを用いて還元剤タンク内の液体還元剤が解凍されたかどうかを正確に検知することにある。   Accordingly, an object of the present invention is to further improve the thawing performance of the frozen liquid reducing agent in the reducing agent tank and accurately detect whether the liquid reducing agent in the reducing agent tank has been thawed using a temperature sensor. It is in.

上記目的を達成するために、本発明は、液体還元剤を貯蔵するタンク本体と、該タンク本体に設けられ前記タンク本体内の底部から液体還元剤を吸い込む吸込管と、前記タンク本体内の液体還元剤の温度を検知する温度センサと、前記タンク本体内の液体還元剤の水位を検知する水位センサと、前記タンク本体内の液体還元剤の濃度を検知する濃度センサと、前記タンク本体に設けられ解凍用媒体が循環する解凍用媒体循環パイプと、前記タンク本体内の底部に配設され前記解凍用媒体循環パイプの一部を取り囲む箱型隔壁部材とを備え、該箱型隔壁部材内に前記吸込管の入口部及び前記温度センサの検知部を配設し、前記箱型隔壁部材外に前記水位センサの検知部及び前記濃度センサの検知部を配設したものである。   In order to achieve the above object, the present invention provides a tank main body for storing a liquid reducing agent, a suction pipe that is provided in the tank main body and sucks the liquid reducing agent from a bottom portion in the tank main body, and a liquid in the tank main body. A temperature sensor that detects the temperature of the reducing agent, a water level sensor that detects the water level of the liquid reducing agent in the tank body, a concentration sensor that detects the concentration of the liquid reducing agent in the tank body, and a tank sensor A thawing medium circulation pipe through which the thawing medium circulates, and a box-type partition wall member disposed at the bottom of the tank body and surrounding a part of the thawing medium circulation pipe, An inlet portion of the suction pipe and a detection portion of the temperature sensor are disposed, and a detection portion of the water level sensor and a detection portion of the concentration sensor are disposed outside the box-shaped partition member.

また、前記箱型隔壁部材の前記吸込管の入口部付近に、前記吸込管の入口部に装着されるフィルタの掃除又は交換のための孔部を設けても良い。   Further, a hole for cleaning or replacing a filter attached to the inlet portion of the suction pipe may be provided near the inlet portion of the suction pipe of the box-shaped partition member.

本発明によれば、還元剤タンク内の凍結した液体還元剤の解凍性能をより高め、且つ温度センサを用いて還元剤タンク内の液体還元剤が解凍されたかどうかを正確に検知することができるという優れた効果を奏する。   According to the present invention, it is possible to further improve the thawing performance of the frozen liquid reducing agent in the reducing agent tank and accurately detect whether or not the liquid reducing agent in the reducing agent tank has been thawed using the temperature sensor. There is an excellent effect.

図１は、本発明の一実施形態に係る還元剤タンクの斜視図である。FIG. 1 is a perspective view of a reducing agent tank according to an embodiment of the present invention. 図２は、ＳＣＲシステムの概略図である。FIG. 2 is a schematic diagram of an SCR system.

以下、本発明の好適な実施形態を添付図面に基づいて詳述する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図２に本実施形態に係る還元剤タンク（尿素タンク）１０が用いられるＳＣＲシステム１を示す。このＳＣＲシステム１は、車両に搭載されるエンジン２に適用されるものである。   FIG. 2 shows an SCR system 1 in which a reducing agent tank (urea tank) 10 according to this embodiment is used. The SCR system 1 is applied to an engine 2 mounted on a vehicle.

図２に示すように、ＳＣＲシステム１においては、例えば、エンジン（例えば、ディーゼルエンジン）２に接続された排気管３には、排気上流側から順に、尿素水を排気管３内に噴射する尿素噴射ノズル４と、排気管３内に噴射された尿素水から生成されるアンモニアで排気ガス中のＮＯｘ（窒素酸化物）を還元浄化するＳＣＲ触媒（選択還元触媒）５とが配設される。尿素水は尿素タンク１０に貯蔵されており、尿素供給配管６を介して尿素供給ポンプ７に供給される。そして、尿素供給ポンプ７はＥＣＵ（エンジン制御ユニット乃至電子制御ユニット）８により制御され、排気温度センサ（図示せず）により検知されるＳＣＲ触媒５の入口の排気温度がＳＣＲ触媒５の活性温度に達したとき、排気ガス中のＮＯｘの量に見合った量の尿素水を尿素噴射ノズル４に供給する。   As shown in FIG. 2, in the SCR system 1, for example, urea that injects urea water into the exhaust pipe 3 sequentially from the exhaust upstream side to the exhaust pipe 3 connected to the engine (for example, diesel engine) 2. An injection nozzle 4 and an SCR catalyst (selective reduction catalyst) 5 for reducing and purifying NOx (nitrogen oxides) in the exhaust gas with ammonia generated from urea water injected into the exhaust pipe 3 are disposed. The urea water is stored in the urea tank 10 and is supplied to the urea supply pump 7 via the urea supply pipe 6. The urea supply pump 7 is controlled by an ECU (engine control unit or electronic control unit) 8 so that the exhaust temperature at the inlet of the SCR catalyst 5 detected by an exhaust temperature sensor (not shown) becomes the activation temperature of the SCR catalyst 5. When it reaches, an amount of urea water corresponding to the amount of NOx in the exhaust gas is supplied to the urea injection nozzle 4.

図１に本実施形態に係る尿素タンク１０の構造を示す。図１中、吸水口等は省略している。   FIG. 1 shows the structure of a urea tank 10 according to this embodiment. In FIG. 1, water inlets and the like are omitted.

図１に示すように、本実施形態に係る尿素タンク１０は、尿素水を貯蔵する略直方体形状のタンク本体１１と、タンク本体１１の上部からタンク本体１１の底部に向かい垂下され、タンク本体１１の底部から尿素水を吸い込む吸込管１２と、タンク本体１１内の尿素水の温度を検知する温度センサ１３と、タンク本体１１内の尿素水の水位を検知する水位センサ（図示せず）と、タンク本体１１内の尿素水の濃度を検知する濃度センサ（図示せず）と、タンク本体１１内の凍結した尿素水を解凍するための解凍用媒体（本実施形態では、エンジン冷却水）が循環する解凍用媒体循環パイプ（本実施形態では、エンジン冷却水循環パイプ）１４と、タンク本体１１内の底部に配設され、エンジン冷却水循環パイプ１４の一部を取り囲む箱型隔壁部材１５とを備えている。   As shown in FIG. 1, a urea tank 10 according to this embodiment includes a substantially rectangular parallelepiped tank body 11 that stores urea water, and a tank body 11 that hangs from the upper part of the tank body 11 toward the bottom of the tank body 11. A suction pipe 12 for sucking urea water from the bottom of the tank, a temperature sensor 13 for detecting the temperature of urea water in the tank body 11, a water level sensor (not shown) for detecting the level of urea water in the tank body 11, A concentration sensor (not shown) for detecting the concentration of urea water in the tank main body 11 and a thawing medium (in this embodiment, engine cooling water) for thawing the frozen urea water in the tank main body 11 circulate. A thawing medium circulation pipe (in this embodiment, an engine cooling water circulation pipe) 14 and a box-shaped partition wall disposed at the bottom of the tank body 11 and surrounding a part of the engine cooling water circulation pipe 14 And a wood 15.

本実施形態では、吸込管１２の出口部（上端部）は、タンク本体１１上部に設けられた開口部を閉塞する天蓋１６に取り付けられている。   In the present embodiment, the outlet portion (upper end portion) of the suction pipe 12 is attached to a canopy 16 that closes the opening provided in the upper portion of the tank body 11.

エンジン冷却水循環パイプ１４は、天蓋１６からタンク本体１１の底部に向かい垂下され、エンジン冷却水をエンジン２側からタンク本体１１内に供給するための供給管部１７と、天蓋１６からタンク本体１１の底部に向かい垂下され、エンジン冷却水をタンク本体１１内からエンジン２側に戻すための戻し管部１８と、供給管部１７の下端と戻し管部１８の下端とを接続する略Ｕ字状の屈曲管部１９とから構成されており、全体として側面視で略Ｌ字状に形成されている。即ち、エンジン冷却水循環パイプ１４の入口部（供給管部１７の上端部）及び出口部（戻し管部１８の上端部）は、天蓋１６に取り付けられいる。また、屈曲管部１９は、吸込管１２の入口部（下端部）及び温度センサ１６の検知部２２を取り囲むように平面視で略Ｕ字状に屈曲されている。   The engine cooling water circulation pipe 14 hangs down from the canopy 16 toward the bottom of the tank main body 11, a supply pipe portion 17 for supplying engine cooling water from the engine 2 into the tank main body 11, and the canopy 16 to the tank main body 11. A substantially U-shape that hangs down toward the bottom and connects the return pipe 18 for returning the engine coolant from the tank body 11 to the engine 2 side, and the lower end of the supply pipe 17 and the lower end of the return pipe 18. It is comprised from the bending pipe part 19, and is formed in the substantially L shape by the side view as a whole. In other words, the inlet portion (the upper end portion of the supply pipe portion 17) and the outlet portion (the upper end portion of the return pipe portion 18) of the engine coolant circulation pipe 14 are attached to the canopy 16. The bent pipe portion 19 is bent in a substantially U shape in plan view so as to surround the inlet portion (lower end portion) of the suction pipe 12 and the detection portion 22 of the temperature sensor 16.

温度センサ１３は、天蓋１６に取り付けられた基部２０と、基部２０からタンク本体１１の底部に向かい垂下され、電極等が内装される延出部２１と、延出部２１の下端部に形成された検知部２２とから構成されている。   The temperature sensor 13 is formed on a base 20 attached to the canopy 16, an extending part 21 that hangs down from the base 20 toward the bottom of the tank body 11, and in which electrodes and the like are installed, and a lower end part of the extending part 21. And the detection unit 22.

水位センサの基部及び濃度センサの基部は、タンク本体１１に取り付けられていても良く、天蓋１６に取り付けられていても良い。   The base of the water level sensor and the base of the concentration sensor may be attached to the tank body 11 or may be attached to the canopy 16.

本実施形態の箱型隔壁部材１５は天板２３と底板２４と側板２５とから構成されており、これら天板２３、底板２４及び側板２５は耐食性に優れた材料（例えば、ステンレス）からなる。天板２３には、吸込管１２、温度センサ１３の延出部２１、エンジン冷却水循環パイプ１４の供給管部１７及び戻し管部１８がそれぞれ挿通される挿通穴２６、２７、２８が形成されている。本実施形態では、天板２３はエンジン冷却水循環パイプ１４の供給管部１７及び戻し管部１８が挿通される挿通穴２８の部分で分割されており、分割された天板２３でエンジン冷却水循環パイプ１４の供給管部１７及び戻し管部１８を側方から挟み込むようになっている。さらに、本実施形態では、吸込管１２、温度センサ１３の延出部２１、エンジン冷却水循環パイプ１４の供給管部１７及び戻し管部１８と、各挿通穴２６、２７、２８との間には隙間があり、その隙間２６、２７、２８を通って尿素水が箱型隔壁部材１５外から箱型隔壁部材１５内に導入されるようになっている。   The box-type partition member 15 according to the present embodiment includes a top plate 23, a bottom plate 24, and side plates 25. The top plate 23, the bottom plate 24, and the side plates 25 are made of a material (for example, stainless steel) having excellent corrosion resistance. The top plate 23 is formed with insertion holes 26, 27, 28 through which the suction pipe 12, the extension part 21 of the temperature sensor 13, the supply pipe part 17 and the return pipe part 18 of the engine cooling water circulation pipe 14 are respectively inserted. Yes. In the present embodiment, the top plate 23 is divided at a portion of the insertion hole 28 through which the supply pipe portion 17 and the return pipe portion 18 of the engine cooling water circulation pipe 14 are inserted, and the engine cooling water circulation pipe is divided by the divided top plate 23. The 14 supply pipe portions 17 and the return pipe portion 18 are sandwiched from the side. Furthermore, in this embodiment, the suction pipe 12, the extension part 21 of the temperature sensor 13, the supply pipe part 17 and the return pipe part 18 of the engine coolant circulation pipe 14, and the insertion holes 26, 27, 28 There is a gap, and urea water is introduced from the outside of the box-type partition member 15 into the box-type partition member 15 through the gaps 26, 27, and 28.

本実施形態に係る尿素タンク１０では、箱型隔壁部材１５内に、吸込管１２の入口部及び温度センサ１３の検知部２２を配設している。また、図示はしないが、本実施形態に係る尿素タンク１０では、水位センサの検知部及び濃度センサの検知部は箱型隔壁部材１５外側の適宜箇所に各々配設されている。即ち、本実施形態に係る尿素タンク１０では、箱型隔壁部材１５外に、水位センサの検知部及び濃度センサの検知部を配設している。   In the urea tank 10 according to the present embodiment, an inlet portion of the suction pipe 12 and a detection portion 22 of the temperature sensor 13 are disposed in the box-shaped partition member 15. Although not shown, in the urea tank 10 according to the present embodiment, the detection unit of the water level sensor and the detection unit of the concentration sensor are respectively disposed at appropriate locations outside the box-type partition wall member 15. That is, in the urea tank 10 according to the present embodiment, the detection unit of the water level sensor and the detection unit of the concentration sensor are disposed outside the box-shaped partition member 15.

ところで、吸込管１２の入口部にはゴミ取りのためのフィルタを装着するが、吸込管１２の入口部を箱型隔壁部材１５内に閉じ込めるとフィルタ掃除乃至交換等の作業に手間がかかる虞がある。そこで、吸込管１２の入口部付近の箱型隔壁部材１５の上部（天板２３）乃至側部（側板２５）にフィルタ掃除乃至交換のための孔部２９を設けると良い。本実施形態では、吸込管１２の入口部付近の箱型隔壁部材１５の側板２５に孔部２９を設けている。箱型隔壁部材１５には、孔部２９の一部又は全部を閉塞する熱逃げ防止用の蓋（図示せず）を設けるとさらに有利である。   By the way, a filter for removing dust is attached to the inlet portion of the suction pipe 12. However, if the inlet portion of the suction pipe 12 is confined in the box-type partition wall member 15, there is a possibility that work such as cleaning or replacement of the filter may be troublesome. is there. Therefore, it is preferable to provide a hole 29 for cleaning or replacing the filter in the upper part (top plate 23) or side part (side plate 25) of the box-shaped partition member 15 near the inlet part of the suction pipe 12. In the present embodiment, a hole 29 is provided in the side plate 25 of the box-type partition member 15 near the inlet of the suction pipe 12. It is further advantageous to provide the box-type partition member 15 with a heat escape prevention lid (not shown) that closes part or all of the hole 29.

以上の構成からなる本実施形態の作用を説明する。   The operation of the present embodiment having the above configuration will be described.

図２に示されるＳＣＲシステム１では、温度センサ１３で検知されるタンク本体１１内の尿素水の温度が所定値より低くなったときに吸込管１２の入口部付近の尿素水が凍結したと診断してエンジン冷却水をエンジン冷却水循環パイプ１４に供給する。また、温度センサ１３で検知されるタンク本体１１内の尿素水の温度が上記所定値以上になったときに吸込管１２の入口部付近の尿素水が解凍されたと診断してエンジン冷却水の供給を停止すると共にＳＣＲシステム１０を作動させるようにする。   In the SCR system 1 shown in FIG. 2, when the temperature of the urea water in the tank body 11 detected by the temperature sensor 13 becomes lower than a predetermined value, it is diagnosed that the urea water near the inlet portion of the suction pipe 12 is frozen. Then, the engine cooling water is supplied to the engine cooling water circulation pipe 14. Further, when the temperature of the urea water in the tank body 11 detected by the temperature sensor 13 becomes equal to or higher than the predetermined value, it is diagnosed that the urea water near the inlet portion of the suction pipe 12 has been thawed and the engine cooling water is supplied. And the SCR system 10 is activated.

また、フィルタ掃除乃至交換時は吸込管１２等を箱型隔壁部材１５ごとタンク本体１１外に取り出す。吸込管１２の入口部付近の箱型隔壁部材１５にフィルタ掃除乃至交換のための孔部２９を設けていることによって、フィルタ掃除や交換時等には箱型隔壁部材１５を吸込管１２等から外すことなく吸込管１２の入口部に装着されるフィルタの掃除や交換が可能となる。   Further, when the filter is cleaned or replaced, the suction pipe 12 and the like are taken out of the tank body 11 together with the box-type partition wall member 15. By providing a hole 29 for cleaning or replacing the filter in the box-shaped partition member 15 near the inlet of the suction pipe 12, the box-shaped partition member 15 is removed from the suction pipe 12 or the like when cleaning or replacing the filter. The filter attached to the inlet of the suction pipe 12 can be cleaned or replaced without removing it.

本実施形態に係る尿素タンク１０では、尿素水を貯蔵するタンク本体１１と、タンク本体１１に設けられ、タンク本体１１内の底部から尿素水を吸い込む吸込管１２と、タンク本体１１内の尿素水の温度を検知する温度センサ１３と、タンク本体１１内の尿素水の水位を検知する水位センサと、タンク本体１１内の尿素水の濃度を検知する濃度センサと、タンク本体１１に設けられ、エンジン冷却水が循環するエンジン冷却水循環パイプ１４と、タンク本体１１内の底部に配設され、エンジン冷却水循環パイプ１４の一部を取り囲む箱型隔壁部材１５とを備え、箱型隔壁部材１５内に吸込管１２の入口部及び温度センサ１３の検知部２２を配設し、箱型隔壁部材１５外に前記水位センサの検知部及び前記濃度センサの検知部を配設したので、箱型隔壁部材１５内部にある部品の熱容量が小さくなり、吸込管１２の入口部付近の凍結した尿素水の解凍性能が向上するため、ＳＣＲシステム１を作動できるまでの待ち時間が短縮される。   In the urea tank 10 according to the present embodiment, a tank main body 11 that stores urea water, a suction pipe 12 that is provided in the tank main body 11 and sucks urea water from the bottom of the tank main body 11, and urea water in the tank main body 11 A temperature sensor 13 for detecting the temperature of the tank, a water level sensor for detecting the level of urea water in the tank main body 11, a concentration sensor for detecting the concentration of urea water in the tank main body 11, and the tank main body 11. An engine cooling water circulation pipe 14 through which cooling water circulates and a box-shaped partition member 15 disposed at the bottom of the tank body 11 and surrounding a part of the engine cooling water circulation pipe 14 are sucked into the box-shaped partition member 15. Since the inlet part of the pipe 12 and the detection part 22 of the temperature sensor 13 are arranged, and the detection part of the water level sensor and the detection part of the concentration sensor are arranged outside the box-shaped partition member 15, Type partition member 15 the heat capacity of the component is reduced in the interior, since the decompression performance of frozen urea water in the vicinity of the inlet portion of the suction pipe 12 is improved, the waiting time until operating the SCR system 1 is shortened.

即ち、本実施形態では、優先度を考慮して吸込管１２の入口部及び温度センサ１３の検知部２２を箱型隔壁部材１５内に配設し、水位センサの検知部及び濃度センサの検知部を箱型隔壁部材１５外に配設して、吸込管１２の入口部及び温度センサ１３の検知部２２の二部品近傍の尿素水の解凍を優先して行うことで、箱型隔壁部材１５内部にある部品の熱容量を小さくしているのである。   That is, in the present embodiment, in consideration of the priority, the inlet portion of the suction pipe 12 and the detection portion 22 of the temperature sensor 13 are disposed in the box-shaped partition member 15, and the detection portion of the water level sensor and the detection portion of the concentration sensor. Is disposed outside the box-shaped partition wall member 15, and the thawing of urea water in the vicinity of the two parts of the inlet section of the suction pipe 12 and the detection section 22 of the temperature sensor 13 is performed preferentially, thereby The heat capacity of the parts in is reduced.

また、本実施形態に係る尿素タンク１０では、吸込管１２の入口部及び温度センサ１３の検知部２２を箱型隔壁部材１５内に配設したので、吸込管１２の入口部近傍の尿素水の温度を正確に検知することができ、温度センサ１３を用いて尿素タンク１０内の尿素水が解凍されたかどうかを正確に検知することが可能になる。   Further, in the urea tank 10 according to the present embodiment, the inlet portion of the suction pipe 12 and the detection portion 22 of the temperature sensor 13 are disposed in the box-shaped partition member 15, so that urea water near the inlet portion of the suction pipe 12 is disposed. The temperature can be accurately detected, and it is possible to accurately detect whether or not the urea water in the urea tank 10 has been thawed using the temperature sensor 13.

また、本実施形態に係る尿素タンク１０では、箱型隔壁部材１５の吸込管１２の入口部付近に、吸込管１２の入口部に装着されるフィルタの掃除又は交換のための孔部２９を設けたので、フィルタ掃除や交換時等には吸込管１２等を箱型隔壁部材１５ごとタンク本体１１外に取り出し箱型隔壁部材１５を吸込管１２等から外すことなく吸込管１２の入口部に装着されるフィルタの掃除や交換が可能となり、フィルタ掃除乃至交換の作業性が向上する。   Further, in the urea tank 10 according to the present embodiment, a hole 29 for cleaning or replacing a filter attached to the inlet portion of the suction pipe 12 is provided near the inlet portion of the suction pipe 12 of the box-shaped partition member 15. Therefore, when cleaning or replacing the filter, the suction pipe 12 and the like are removed from the tank body 11 together with the box-type partition member 15 and attached to the inlet portion of the suction pipe 12 without removing the box-type partition member 15 from the suction pipe 12 or the like. The filter can be cleaned or replaced, and the workability of filter cleaning or replacement is improved.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態には限定されず他の様々な実施形態を採ることが可能である。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various other embodiments can be adopted.

例えば、還元剤タンク１０に貯蔵される液体還元剤は尿素水には限定はされず、他の液体還元剤であっても良い。   For example, the liquid reducing agent stored in the reducing agent tank 10 is not limited to urea water, and may be another liquid reducing agent.

１０ 還元剤タンク（尿素タンク）
１１ タンク本体
１２ 吸込管
１３ 温度センサ
１４ 解凍用媒体循環パイプ（エンジン冷却水循環パイプ）
１５ 箱型隔壁部材
２２ 温度センサの検知部
２９ 孔部 10 Reducing agent tank (urea tank)
11 Tank Body 12 Suction Pipe 13 Temperature Sensor 14 Thawing Medium Circulation Pipe (Engine Cooling Water Circulation Pipe)
15 Box-shaped partition member 22 Temperature sensor detection part 29 Hole part

Claims (2)

液体還元剤を貯蔵するタンク本体と、該タンク本体に設けられ前記タンク本体内の底部から液体還元剤を吸い込む吸込管と、前記タンク本体内の液体還元剤の温度を検知する温度センサと、前記タンク本体内の液体還元剤の水位を検知する水位センサと、前記タンク本体内の液体還元剤の濃度を検知する濃度センサと、前記タンク本体に設けられ解凍用媒体が循環する解凍用媒体循環パイプと、前記タンク本体内の底部に配設され前記解凍用媒体循環パイプの一部を取り囲む箱型隔壁部材とを備え、該箱型隔壁部材内に前記吸込管の入口部及び前記温度センサの検知部を配設し、前記箱型隔壁部材外に前記水位センサの検知部及び前記濃度センサの検知部を配設したことを特徴とする還元剤タンク。   A tank body that stores the liquid reducing agent, a suction pipe that is provided in the tank body and draws in the liquid reducing agent from the bottom of the tank body, a temperature sensor that detects the temperature of the liquid reducing agent in the tank body, and A water level sensor for detecting the level of the liquid reducing agent in the tank body, a concentration sensor for detecting the concentration of the liquid reducing agent in the tank body, and a thawing medium circulation pipe provided in the tank body and circulating the thawing medium And a box-type partition member disposed at the bottom of the tank body and surrounding a part of the thawing medium circulation pipe, and the inlet of the suction pipe and the detection of the temperature sensor in the box-type partition member The reducing agent tank is characterized in that a detection part of the water level sensor and a detection part of the concentration sensor are arranged outside the box-shaped partition member. 前記箱型隔壁部材の前記吸込管の入口部付近に、前記吸込管の入口部に装着されるフィルタの掃除又は交換のための孔部を設けた請求項１に記載の還元剤タンク。   The reducing agent tank according to claim 1, wherein a hole for cleaning or replacing a filter attached to the inlet portion of the suction pipe is provided in the vicinity of the inlet portion of the suction pipe of the box-shaped partition member.
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