JP2751247B2 - Exhaust heat exchanger - Google Patents
Exhaust heat exchangerInfo
- Publication number
- JP2751247B2 JP2751247B2 JP63269535A JP26953588A JP2751247B2 JP 2751247 B2 JP2751247 B2 JP 2751247B2 JP 63269535 A JP63269535 A JP 63269535A JP 26953588 A JP26953588 A JP 26953588A JP 2751247 B2 JP2751247 B2 JP 2751247B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- exhaust
- heat exchanger
- pipe
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は排気熱交換器、特にエンジンの排熱を回収す
る排気熱交換器に関する。The present invention relates to an exhaust heat exchanger, and more particularly to an exhaust heat exchanger that recovers exhaust heat of an engine.
＜従来の技術＞ エンジン駆動式空調機では、エンジンの排熱を排気熱
交換器で回収し、寒冷時における空調機の駆動に際し
て、この回収熱を空調機に導いて暖房能力の低下を防止
している。<Conventional technology> In an engine driven air conditioner, exhaust heat of the engine is recovered by an exhaust heat exchanger, and when the air conditioner is driven in cold weather, this recovered heat is guided to the air conditioner to prevent a decrease in heating capacity. ing.
また、自動車においては、排気熱交換器で回収した熱
を車内の暖房に利用している。In an automobile, the heat recovered by the exhaust heat exchanger is used for heating the interior of the vehicle.
この種の排気熱交換器においては、熱の回収効率が高
まって、エンジンの排気ガスが流される排気管の温度が
低下し過ぎると、排気ガスが液化してドレイン水が発生
する。このドレイン水は酸性で排気管の内壁を腐蝕する
ので、ドレイン水の発生を極力おさえて排気熱交換器を
作動させることが必要である。In this type of exhaust heat exchanger, when the efficiency of heat recovery is increased and the temperature of the exhaust pipe through which the exhaust gas of the engine flows is too low, the exhaust gas is liquefied and drain water is generated. Since this drain water is acidic and corrodes the inner wall of the exhaust pipe, it is necessary to operate the exhaust heat exchanger while minimizing the generation of drain water.
特開昭63−88212号公報において、この種の排気熱交
換器において、排気熱交換器から放出される排気ガスの
温度が所定範囲で一定するように作動する方式のものが
提案されている。Japanese Patent Application Laid-Open No. 63-88212 proposes an exhaust heat exchanger of this type which operates so that the temperature of exhaust gas discharged from the exhaust heat exchanger is constant within a predetermined range.
この提案に係る熱交換装置では、熱交換器を通った排
気ガスの温度を検出し、この温度が所定値を超えて高く
なると、熱交換管装置に設けられている複数の排気ガス
管体のうち、熱交換を行う排気ガスが流される管体の数
を増加させている。In the heat exchange device according to this proposal, the temperature of the exhaust gas passing through the heat exchanger is detected, and when this temperature rises above a predetermined value, a plurality of exhaust gas pipes provided in the heat exchange pipe device are detected. Among them, the number of pipes through which exhaust gas for heat exchange flows is increased.
このようにすることにより、熱交換器の交換能力が高
まり排気ガスの温度を低下させ、逆に排気ガスの温度が
低下し過ぎた場合には、熱交換を行う排気ガスが流され
る管体の数を減少させて、排気ガスの温度を上昇させて
いる。By doing so, the exchange capacity of the heat exchanger is increased and the temperature of the exhaust gas is lowered. Conversely, if the temperature of the exhaust gas is too low, the pipe of the pipe through which the exhaust gas for heat exchange flows is formed. The number is reduced to increase the temperature of the exhaust gas.
＜発明が解決しようとする課題＞ しかし、上記の熱交換装置では、排気ガス量の制御用
の電磁弁或は管体数切換用の電磁弁が、排気ガスが流さ
れる排気ガス管に設けられており、この電磁弁が常時排
気ガスと接触している。このために、排気管内壁や電磁
弁部分に排気ガス中のカーボンなどの含有物質が固着
し、また、サーマルショックによる亀裂が排気管内壁や
電磁弁部分に生じ易く、これが原因で電磁弁が正常に作
動しないことがある。<Problems to be Solved by the Invention> However, in the above heat exchanger, an electromagnetic valve for controlling the amount of exhaust gas or an electromagnetic valve for switching the number of pipes is provided in the exhaust gas pipe through which the exhaust gas flows. This solenoid valve is in constant contact with exhaust gas. As a result, substances such as carbon in the exhaust gas adhere to the inner wall of the exhaust pipe and the solenoid valve, and cracks due to thermal shock are liable to occur on the inner wall of the exhaust pipe and the solenoid valve. May not work.
本発明の目的は、排気ガス中の含有物質やサーマルシ
ョックの影響を受けることなく、排気ガス温度をほぼ一
定に保つ制御が行なわれる排気熱交換器を提供すること
である。An object of the present invention is to provide an exhaust heat exchanger in which control is performed to keep the exhaust gas temperature substantially constant without being affected by substances contained in the exhaust gas or thermal shock.
＜課題を解決するための手段＞ 本発明においては、熱交換用流水管から分岐する複数
の分岐流水管が設けられて各分岐流水管に電磁弁が配設
され、これら複数の電磁弁の開閉制御によって、熱交換
器内の流水管の排気管に対する接触流路長が増減される
構成となっている。<Means for Solving the Problems> In the present invention, a plurality of branch flowing water pipes branched from a heat exchange flowing water pipe are provided, and an electromagnetic valve is disposed in each of the branch flowing water pipes. By the control, the length of the contact flow path of the flowing water pipe in the heat exchanger with respect to the exhaust pipe is increased or decreased.
すなわち、本発明は、エンジンの排気ガスを導く排気
ガス管と、熱交換水を導く流水管とで構成される排気熱
交換器において、 前記熱交換器内の流水管の複数箇所から分岐する複数
の分岐流水管と、各分岐流水管に挿入配設される電磁弁
と、前記排気ガス管の排気ガス放出端部に設けられて排
気ガスの温度を検出する温度センサと、温度センサの検
出信号に基づいて前記各電磁弁の開閉動作を行う制御回
路とを有する構成となっている。That is, the present invention relates to an exhaust heat exchanger composed of an exhaust gas pipe for guiding exhaust gas of an engine and a flowing water pipe for guiding heat exchange water, wherein a plurality of branches branching from a plurality of locations of the flowing water pipe in the heat exchanger. A branch flow water pipe, a solenoid valve inserted and disposed in each branch flow water pipe, a temperature sensor provided at an exhaust gas discharge end of the exhaust gas pipe to detect the temperature of exhaust gas, and a detection signal of the temperature sensor. And a control circuit that opens and closes each of the electromagnetic valves based on the above.
＜作用＞ 温度センサによって排気ガスの温度が検出され、この
検出温度が予め設定した所定値を超えると、制御回路か
らの制御信号によって、各分岐流水管に設けられた電磁
弁が選択的に開閉され、それによって、熱交換器におけ
る流水管の排気管に対する接触流路長が長くなるように
制御される。この制御によって、排気ガスの排熱の回収
量が多くなるので、排気ガスの温度が予め設定した所定
値に近づくように低下する。<Operation> The temperature of the exhaust gas is detected by the temperature sensor, and when the detected temperature exceeds a predetermined value, the solenoid valve provided in each branch water pipe is selectively opened and closed by a control signal from the control circuit. Thereby, control is performed such that the contact flow path length of the flowing water pipe to the exhaust pipe in the heat exchanger becomes longer. By this control, the amount of exhaust heat recovered from the exhaust gas increases, so that the temperature of the exhaust gas decreases so as to approach a predetermined value set in advance.
温度センサの検出温度が予め設定した所定値よりも低
くなると、制御回路からの制御信号によって、上記電磁
弁が選択的開閉されて熱交換器における流水管の排気管
に対する接触流路長が短くなるように制御される。この
場合には、排気ガスの排熱の回収量が少なくなるので、
排気ガスの温度が予め設定した所定値に近づくように上
昇する。When the temperature detected by the temperature sensor becomes lower than a predetermined value set in advance, the solenoid valve is selectively opened and closed by a control signal from the control circuit, and the contact flow path length of the flowing water pipe to the exhaust pipe in the heat exchanger is shortened. Is controlled as follows. In this case, the amount of exhaust heat recovered from the exhaust gas is reduced,
The temperature of the exhaust gas rises so as to approach a predetermined value set in advance.
このようにして、排気ガスの温度は常にほぼ一定の範
囲内に維持される。In this way, the temperature of the exhaust gas is always kept within a substantially constant range.
＜実施例＞ 以下、本発明の実施例を図面を参照して説明する。<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.
図は、実施例の構成を示すブロック図であり、図示せ
ぬエンジンからの排気ガスが流される排気ガス管１の排
気口の近傍には、消音用のマフラー２が取り付けられて
いる。FIG. 1 is a block diagram showing a configuration of the embodiment. A muffler 2 for noise reduction is attached near an exhaust port of an exhaust gas pipe 1 through which exhaust gas from an engine (not shown) flows.
一方、熱交換水が流される流水管３には、排気ガス管
１と流水管３との接触流路長を設定する分岐流水管が間
隔Δｌ毎に複数位置から分岐して導出され、これらの分
岐路にそれぞれ電磁弁４−１〜４−５が挿入配設されて
いる。On the other hand, in the flowing water pipe 3 through which the heat exchange water flows, branched flowing water pipes for setting the contact flow path length between the exhaust gas pipe 1 and the flowing water pipe 3 are branched out from a plurality of positions at intervals of Δl and led out. Solenoid valves 4-1 to 4-5 are inserted and arranged in the branch paths, respectively.
従って、電磁弁４−１のみが開とされた場合の接触流
路長さをl0とすれば、電磁弁４−２のみが開とされた場
合……（以下同様にして）電磁弁４−５のみが開とされ
た場合のそれぞれの接触流路長l1、l2……l5は、（１）
ないし（５）式で与えられるようになっている。Therefore, if the contact passage length when it is an electromagnetic valve 4-1 NomigaHiraki and l 0, ...... If it is an electromagnetic valve 4-2 NomigaHiraki (similarly hereinafter) solenoid valve 4 When only -5 is opened, the respective contact flow path lengths l 1 , l 2, ..., L 5 are (1)
Or (5).
l1＝l0 ……（１） l2＝l0＋Δｌ ……（２） l3＝l0＋２Δｌ ……（３） l4＝l0＋３Δｌ ……（４） l5＝l0＋４Δｌ ……（５） この流水管３と排気ガス管１とが、流入側端部近傍で
熱交換器５を構成している。l 1 = l 0 ... (1) l 2 = l 0 + Δl ... (2) l 3 = l 0 + 2Δl ... (3) l 4 = l 0 + 3Δl ... (4) l 5 = l 0 + 4Δl ... (5) The flowing water pipe 3 and the exhaust gas pipe 1 constitute a heat exchanger 5 near the inflow side end.
排気管１の排気口の近傍に温度センサ６が取り付けら
れ、この温度センサ６の出力端子は制御回路７に接続さ
れ、制御回路７の出力端子は電磁弁４−１〜４−５に接
続されている。温度センサ６がマフラー２から放出され
る排気ガスの温度を検出し、検出温度が予め設定された
基準温度を下回ると、温度センサ６の検出信号によって
制御回路７からは、弁選択信号が出力される。A temperature sensor 6 is attached near the exhaust port of the exhaust pipe 1, and an output terminal of the temperature sensor 6 is connected to a control circuit 7, and an output terminal of the control circuit 7 is connected to solenoid valves 4-1 to 4-5. ing. The temperature sensor 6 detects the temperature of the exhaust gas emitted from the muffler 2, and when the detected temperature falls below a preset reference temperature, a valve selection signal is output from the control circuit 7 by the detection signal of the temperature sensor 6. You.
この弁選択信号によって、前述の接触流路長ｌを短く
するように電磁弁４−１〜４−５が選択される。例え
ば、現在電磁弁４−５が開となっていて、接触流路長が
ｌ＝l0＋４Δｌであるとすると、温度センサ６の検出信
号に対応して、電磁弁４−５が閉じられ、電磁弁４−１
から４−４のいずれかが選択されて開とされる。By this valve selection signal, the solenoid valves 4-1 to 4-5 are selected so as to shorten the aforementioned contact flow path length l. For example, assuming that the solenoid valve 4-5 is currently open and the contact flow path length is l = l 0 + 4Δl, the solenoid valve 4-5 is closed in response to the detection signal of the temperature sensor 6, Solenoid valve 4-1
To 4-4 are selected and opened.
この場合（１）〜（４）式に示すように、電磁弁４−
１を選択すると接触流路長ｌが最小値となり、これらの
接触流路長間には、l1＜l2＜l3＜l4の関係がある。In this case, as shown in equations (1) to (4), the solenoid valve 4-
When 1 is selected, the contact channel length l becomes the minimum value, and there is a relationship of l 1 <l 2 <l 3 <l 4 between these contact channel lengths.
このように制御することにより、排気ガスの排熱の回
収量が低下し、排気ガスの温度は基準温度に近づく方向
に上昇する。By performing such control, the recovery amount of the exhaust heat of the exhaust gas decreases, and the temperature of the exhaust gas increases in a direction approaching the reference temperature.
また、温度センサ６の検出温度が予め設定された基準
温度を超えると、温度センサ６の検出信号によって制御
回路７からは同様に、弁選択信号が出力される。When the temperature detected by the temperature sensor 6 exceeds a preset reference temperature, a valve selection signal is similarly output from the control circuit 7 by the detection signal of the temperature sensor 6.
この場合には、弁選択信号によって、前述の接触流路
長ｌを長くするように、電磁弁４−１〜４−５が選択さ
れる。例えば現在電磁弁４−１が開となっていて、接触
流路長がｌ＝l0であるとすると、電磁弁４−１は閉じら
れ温度センサ６の検出信号に対応して、電磁弁４−２〜
４−５のいずれかが選択されて開となる。In this case, the solenoid valves 4-1 to 4-5 are selected by the valve selection signal so as to increase the above-described contact flow path length l. For example, assuming that the solenoid valve 4-1 is currently open and the contact flow path length is l = 10 , the solenoid valve 4-1 is closed and the solenoid valve 4 is closed in response to the detection signal of the temperature sensor 6. -2-
4-5 is selected and opened.
この制御によって、排気ガスの温度は基準温度に近づ
く方向に低下する。With this control, the temperature of the exhaust gas decreases in a direction approaching the reference temperature.
このようにして、実施例によると、排気ガスの温度
は、予め設定された基準温度にほぼ一致するように制御
されるので、排気管１内の排気ガスの温度低下によるド
レインの発生をおさえることにより排気管１の内壁の腐
蝕を防止することが出来る。Thus, according to the embodiment, the temperature of the exhaust gas is controlled so as to substantially coincide with the preset reference temperature, so that the generation of the drain due to the temperature decrease of the exhaust gas in the exhaust pipe 1 is suppressed. Accordingly, corrosion of the inner wall of the exhaust pipe 1 can be prevented.
また、排気ガスの温度がほぼ一定値に維持され、大幅
に温度が変動することがないので、排気管１にサーマル
ショックによる亀裂が生じることもない。Further, since the temperature of the exhaust gas is maintained at a substantially constant value and the temperature does not fluctuate significantly, cracks in the exhaust pipe 1 due to thermal shock do not occur.
電磁弁４は、流水管３に挿入配設されているので、排
気ガス中の含有物の付着やサーマルショックで電磁弁４
の制御が悪影響を受けることは全くなく、円滑な制御が
行なわれる。Since the solenoid valve 4 is inserted and arranged in the water pipe 3, the solenoid valve 4 is attached to the exhaust valve due to the adhesion of the substance contained in the exhaust gas or thermal shock.
Is not adversely affected at all, and smooth control is performed.
流水管３に挿入配設されている電磁弁４は、流水管３
を流れる熱交換水のために熱的雰囲気条件が安定してい
て、高精度の制御が行われ、且つ故障が生じにくい。The solenoid valve 4 inserted into the flowing water pipe 3 is
The thermal atmosphere conditions are stable because of the heat exchange water flowing through, and high-precision control is performed, and failures hardly occur.
なお、上記実施例においては、温度センサの検出信号
に基づいて、複数の電磁弁の一つを選択する場合を説明
したが、流水管の管径、熱交換水の流量及び排ガス熱量
に応じては、電磁弁を２箇所以上で開閉制御することが
できることはもちろんである。In the above embodiment, the case where one of the plurality of solenoid valves is selected based on the detection signal of the temperature sensor has been described.However, according to the pipe diameter of the flowing water pipe, the flow rate of heat exchange water, and the calorific value of exhaust gas, Of course, the solenoid valve can be controlled to open and close at two or more locations.
＜発明の効果＞ 以上詳細に説明したように、本発明によると排気ガス
中の含有物の付着やサーマルショックの影響を受けるこ
となく、排気ガスの温度をほぼ一定値に維持して、ドレ
インの発生を防止し、効率よく排熱の回収を行う排気熱
交換器を提供することが出来る。<Effects of the Invention> As described in detail above, according to the present invention, the temperature of the exhaust gas is maintained at a substantially constant value without being affected by the attachment of inclusions in the exhaust gas or thermal shock, and the An exhaust heat exchanger that prevents generation and efficiently collects exhaust heat can be provided.
図は本発明の実施例の構成を示すブロック図である。 １……排気管、２……マフラー ３……流水管 ４−１〜４−５……電磁弁 ５……熱交換器、６……温度センサ ７……制御回路 FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Exhaust pipe 2 ... Muffler 3 ... Water pipe 4-1 to 4-5 ... Solenoid valve 5 ... Heat exchanger 6 ... Temperature sensor 7 ... Control circuit
Claims (1)
熱交換水を導く流水管とで構成される排気熱交換器にお
いて、前記熱交換器内の流水管の複数箇所から分岐する
複数の分岐流水管と、各分岐流水管に挿入配設される電
磁弁と、前記排気ガス管の排気ガス放出端部に設けられ
て排気ガスの温度を検出する温度センサと、温度センサ
の検出信号に基づいて前記各電磁弁の開閉動作を行う制
御回路とを有することを特徴とする、排気熱交換器。An exhaust pipe for guiding exhaust gas of an engine;
In an exhaust heat exchanger composed of a water pipe for guiding heat exchange water, a plurality of branch water pipes branching from a plurality of locations of the water pipes in the heat exchanger, and an electromagnetic wave inserted and disposed in each branch water pipe. A valve, a temperature sensor provided at an exhaust gas discharge end of the exhaust gas pipe to detect the temperature of the exhaust gas, and a control circuit that opens and closes each of the electromagnetic valves based on a detection signal of the temperature sensor. An exhaust heat exchanger, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63269535A JP2751247B2 (en) | 1988-10-27 | 1988-10-27 | Exhaust heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63269535A JP2751247B2 (en) | 1988-10-27 | 1988-10-27 | Exhaust heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02119608A JPH02119608A (en) | 1990-05-07 |
| JP2751247B2 true JP2751247B2 (en) | 1998-05-18 |
Family
ID=17473735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63269535A Expired - Lifetime JP2751247B2 (en) | 1988-10-27 | 1988-10-27 | Exhaust heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2751247B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005049875B4 (en) * | 2005-10-17 | 2007-07-12 | Raimund WÜRZ | Method for operating a vegetable oil cogeneration plant |
-
1988
- 1988-10-27 JP JP63269535A patent/JP2751247B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02119608A (en) | 1990-05-07 |
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