JPH07180549A - Cooling structure for exhaust valve - Google Patents
Cooling structure for exhaust valveInfo
- Publication number
- JPH07180549A JPH07180549A JP32872293A JP32872293A JPH07180549A JP H07180549 A JPH07180549 A JP H07180549A JP 32872293 A JP32872293 A JP 32872293A JP 32872293 A JP32872293 A JP 32872293A JP H07180549 A JPH07180549 A JP H07180549A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- refrigerant
- valve rod
- hole
- passage
- 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.)
- Withdrawn
Links
Landscapes
- Details Of Valves (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は排気弁棒の冷却構造、よ
り詳しくは比較的大型内燃機関における排気弁棒の冷却
構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust valve rod cooling structure, and more particularly to an exhaust valve rod cooling structure in a relatively large internal combustion engine.
【０００２】[0002]
【従来の技術】一般に比較的大型の内燃機関においては
効率向上を図るため高温燃焼が望まれており、そのため
排気弁の腐蝕や耐熱性に問題がある。このような技術上
の問題から冷却水などの冷媒を用いて弁部のシート触火
面又は弁棒部が排気通路に位置する部分等を冷却するこ
とが行なわれている。2. Description of the Related Art Generally, in a relatively large internal combustion engine, high temperature combustion is desired in order to improve efficiency, and therefore there is a problem in corrosion and heat resistance of an exhaust valve. Due to such a technical problem, the seat ignition surface of the valve portion or the portion where the valve rod portion is located in the exhaust passage is cooled by using a coolant such as cooling water.
【０００３】その構造の一例を示すと図４〜図６に示す
ように排気弁１に排気弁棒２を設け、この排気弁棒２の
弁棒部５の中心部に穴４を設け、この穴４の内面と間隙
を持たせて供給管６を挿入し、この供給管６内に冷媒供
給路７を形成し、前記穴４の内面と供給管６の外表面と
の間に冷媒戻し通路８を形成している。そして弁棒部５
の先端に設けた弁棒部３の触火面２ａに接近して環状に
ジャケット９を形成し、図５に示すように前記穴４の下
端とジャケット９との間を供給連絡路４ａで接続しする
と共にジャケット９と冷媒戻し通路８との間を戻し連絡
路４ｂで穴あけの位置を上下にし、更に図６に示すよう
に放射状に交互に配置している。An example of the structure is shown in FIGS. 4 to 6, in which an exhaust valve 1 is provided with an exhaust valve rod 2 and a hole 4 is provided in the center of a valve rod portion 5 of the exhaust valve rod 2. A supply pipe 6 is inserted with a gap from the inner surface of the hole 4 to form a refrigerant supply passage 7 in the supply pipe 6, and a refrigerant return passage is provided between the inner surface of the hole 4 and the outer surface of the supply pipe 6. 8 forming. And valve stem 5
A jacket 9 is formed in an annular shape close to the touch surface 2a of the valve rod portion 3 provided at the tip of the hole, and the lower end of the hole 4 and the jacket 9 are connected by a supply communication path 4a as shown in FIG. At the same time, the holes between the jacket 9 and the refrigerant return passage 8 are opened and closed by the return communication passages 4b, and they are radially arranged alternately as shown in FIG.
【０００４】排気弁棒２の弁棒部５の先端部より冷媒供
給通路７内に供給された冷却水は穴４の下端において供
給連絡路４ａを通じてジャケット９内に流入し、弁傘部
３の、特に触火面３ａを冷却して供給管６と外表面と穴
４の内面との間の冷媒戻し通路８より弁棒部５の上方に
還流しながら排気通路１０内に露出している部分５ａを
冷却するようになっている。The cooling water supplied from the tip of the valve rod portion 5 of the exhaust valve rod 2 into the refrigerant supply passage 7 flows into the jacket 9 through the supply connection passage 4a at the lower end of the hole 4, and the cooling water of the valve umbrella portion 3 is discharged. In particular, the portion exposed to the exhaust passage 10 while cooling the ignition surface 3a and flowing back above the valve rod portion 5 from the refrigerant return passage 8 between the supply pipe 6, the outer surface and the inner surface of the hole 4. 5a is cooled.
【０００５】[0005]
【発明が解決しようとする課題】ところで、このような
排気弁の冷却構造には低温腐蝕の発生する恐れがある。
即ち、燃焼室１１の燃焼ガスは通常約１０００℃程度と
なるが、この燃焼ガスは３００〜４００℃の排ガスＧと
なって排気通路１０から排出されるが、弁部３と弁棒部
５等は冷媒、即ち冷却水の冷却作用により２００℃以下
に冷却されることになる。By the way, there is a possibility that low temperature corrosion may occur in the cooling structure of such an exhaust valve.
That is, the combustion gas in the combustion chamber 11 is usually about 1000 ° C., and this combustion gas becomes exhaust gas G of 300 to 400 ° C. and is discharged from the exhaust passage 10, but the valve portion 3 and the valve rod portion 5 and the like. Is cooled to 200 ° C. or lower by the cooling action of the refrigerant, that is, cooling water.
【０００６】ところでこのような内燃機関の排ガス系に
おいては図７に腐食量と腐食領域との関係を示すように
約７００℃程度の範囲内に発生する高温腐蝕領域Ａと２
００℃以下の範囲内に発生する低温腐蝕領域Ｂが存在す
ることが知られている。従って、前記したように排気弁
棒２の弁棒部５の排気通路１０内に露出している部分５
ａは２００℃以下に冷却されることになり、低温腐蝕が
生じるという問題があったのである。By the way, in such an exhaust gas system of an internal combustion engine, as shown in FIG. 7, which shows the relationship between the corrosion amount and the corrosion region, the high temperature corrosion regions A and 2 which are generated in the range of about 700.degree.
It is known that there exists a low temperature corrosion region B that occurs within the range of 00 ° C. or less. Therefore, as described above, the portion 5 of the valve rod portion 5 of the exhaust valve rod 2 exposed in the exhaust passage 10
There is a problem that a is cooled to 200 ° C. or lower, and low temperature corrosion occurs.
【０００７】[0007]
【課題を解決するための手段】本発明は前記従来技術の
問題点を解決するためになされたものであって、内燃機
関の排気弁を構成する排気弁棒の弁棒部に、この弁棒部
の先端に設けた弁傘部に至る穴を設け、この穴の中に冷
媒の供給管挿入し、この供給管を通じて弁部の周囲に環
状に設けたジャケットに冷媒を供給し、加熱した冷媒を
還流するようにしており、この供給管は前記穴の底部ま
で冷媒を案内する内管と、前記ジャケットを冷却した冷
媒を還流する通路を、前記内管の外周部に形成する外管
との二重管構造に形成し、この外管は少なくとも弁棒部
が排気通路に露出している部分の長さを有しており、更
にこの外管と前記穴の内面との間に冷却水の滞留を許容
する断熱空間を形成している排気弁の冷却構造を提供す
るものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, in which a valve rod portion of an exhaust valve rod constituting an exhaust valve of an internal combustion engine has the valve rod. A hole is provided at the tip of the part to reach the valve head portion, a refrigerant supply pipe is inserted into this hole, and the refrigerant is supplied to the jacket annularly provided around the valve part through this supply pipe to heat the refrigerant. This supply pipe consists of an inner pipe that guides the refrigerant to the bottom of the hole and an outer pipe that forms a passage for returning the refrigerant that has cooled the jacket, in the outer peripheral portion of the inner pipe. The outer pipe is formed into a double pipe structure, and the outer pipe has at least the length of the portion where the valve rod portion is exposed to the exhaust passage, and further the cooling water is provided between the outer pipe and the inner surface of the hole. The present invention provides a cooling structure for an exhaust valve that forms a heat insulating space that allows retention.
【０００８】[0008]
【作 用】前記構造の排気弁の冷却構造によれば、冷媒
の供給管の下部に形成された断熱空間により弁棒部の外
面、特に排気通路内に位置する弁棒部の外面が必要以上
に冷却されることを防止できるため低温腐蝕の恐れはな
くなる。[Operation] According to the cooling structure of the exhaust valve having the above structure, the outer surface of the valve rod portion, especially the outer surface of the valve rod portion located in the exhaust passage is more than necessary due to the heat insulating space formed in the lower portion of the refrigerant supply pipe. Since it can be prevented from being cooled down, there is no fear of low temperature corrosion.
【０００９】[0009]
【実 施 例】以下図１〜図３を参照して本発明による
排気弁の冷却構造の一実施例を説明する。図１は排気弁
棒２０の弁棒部２１の中央部には穴２２が設けられ、こ
の穴２２の内部に供給管２３が穴２２との間に間隙を持
つように挿入され、下端はリング状のシール具２４によ
って穴２２の内面に支持されている。EXAMPLE An example of an exhaust valve cooling structure according to the present invention will be described below with reference to FIGS. In FIG. 1, a hole 22 is provided in the central portion of a valve rod portion 21 of an exhaust valve rod 20, a supply pipe 23 is inserted into the hole 22 so as to have a gap between the hole 22 and a lower end of a ring. It is supported on the inner surface of the hole 22 by a sealing member 24 in the shape of a ring.
【００１０】供給管２３は内管２３ａと外管２３ｂとか
らなる底部を連結した二重管であって、外管２３と弁棒
部２１に開口した穴２２との間の前記間隙によって断熱
空間ｄを形成している。そして弁部２５の触火面２５ａ
の近傍にリング状にジャケット２６が形成され、穴２２
の下端とジャケット２６との間を供給連絡路２２ａで、
ジャケット２６と供給管２３を形成している通路２３ｃ
との間を戻し連絡路２２ｂで連結している。なお、この
供給連絡路２２ａと戻し連絡路２２ｂの配置状態は図５
及び図６の従来の装置と同様である。The supply pipe 23 is a double pipe composed of an inner pipe 23a and an outer pipe 23b, the bottoms of which are connected to each other. The space between the outer pipe 23 and the hole 22 opened in the valve rod portion 21 is a heat insulating space. forming d. And the touch surface 25a of the valve portion 25
A ring-shaped jacket 26 is formed near the
A supply connection path 22a between the lower end of the and the jacket 26,
A passage 23c forming the jacket 26 and the supply pipe 23
And the return communication path 22b. The arrangement state of the supply communication path 22a and the return communication path 22b is shown in FIG.
And the same as the conventional device of FIG.
【００１１】前記供給管２３の外管２３ｂと穴２２の内
面との間は図２に示すようにシール具２４（あるいはス
ペーサー）を介して断熱空間ｄが形成されており、この
断熱空間ｄは図１に示すように排気通路１０内に露出し
ている部分２１ａを充分にカバーする範囲に設けてあ
る。供給管２３は内管２３ａ内を冷却水の供給通路と
し、内管２３ａと外管２３ｂとの間の通路２３ｃを昇温
した冷却水の戻し通路とし、更に外管２３ｂの外表面と
穴２２との間に断熱空間ｄを形成するためのものであっ
て、例えばステンレス鋼などの耐蝕性材料で製作してあ
る。As shown in FIG. 2, a heat insulating space d is formed between the outer pipe 23b of the supply pipe 23 and the inner surface of the hole 22 through a seal member 24 (or a spacer). As shown in FIG. 1, the portion 21a exposed in the exhaust passage 10 is provided in a range that sufficiently covers it. The supply pipe 23 uses the inside of the inner pipe 23a as a cooling water supply passage, the passage 23c between the inner pipe 23a and the outer pipe 23b as a return passage for the cooled water, and further, the outer surface of the outer pipe 23b and the hole 22. And a heat insulating space d between them and are made of a corrosion resistant material such as stainless steel.
【００１２】この断熱空間ｄは冷却水の熱を大量に前記
露出部分２１ａに伝達しない役目をするものであって、
冷却水を強制的に循環することなく、これの中に冷却水
が流入して充満して滞留しているので、この部分の熱伝
達率は著しく小さい。従って、この断熱空間ｄを余り大
きなものとせず、弁棒部２１の露出部分２１ａの温度を
例えば２５０℃〜３００℃程度に充分に高い範囲で保つ
ことができるように設計する。The heat insulating space d serves to prevent a large amount of heat from the cooling water from being transferred to the exposed portion 21a.
The cooling water flows into the cooling water without being forcedly circulated, and the cooling water is filled and staying therein, so that the heat transfer coefficient of this portion is extremely small. Therefore, the heat insulating space d is designed not to be so large and the temperature of the exposed portion 21a of the valve rod portion 21 can be maintained in a sufficiently high range of, for example, about 250 ° C to 300 ° C.
【００１３】前記構成において今、供給管２３の内管２
３ａ内に冷却水等の冷媒を供給すると、供給連絡路２２
ａよりジャット２６内に流入して弁部２５の触火面２５
ａを冷却して戻し連絡路２２ｂより二重管の内部の空間
である通路２３ｃ内に流入して外部の回路に排出され
る。この時、供給管２３の内部に流入した冷媒に充分な
冷却能力があったとしても弁棒部２１の少なくとも排気
通路１０内の露出部分２１ａには断熱空間ｄが形成して
あり、しかも、この断熱空間ｄの内部の冷媒は滞留して
いるので、内管２３ａの内部と、この内管２３ａと外管
２３ｂと内管２３ａとの間の通路２３ｃと、前記断熱空
間ｄとの間に充分な温度差を与えることができる。従っ
て、排気通路１０内の露出部分２１ａの低温腐蝕を防止
することができるのである。In the above structure, the inner pipe 2 of the supply pipe 23 is now
When a coolant such as cooling water is supplied into 3a, the supply communication path 22
a from the a into the jut 26 and the ignition surface 25 of the valve portion 25.
A is cooled and flows into the passage 23c which is the space inside the double pipe from the return communication passage 22b and is discharged to the external circuit. At this time, even if the refrigerant flowing into the supply pipe 23 has a sufficient cooling capacity, the heat insulating space d is formed at least in the exposed portion 21a in the exhaust passage 10 of the valve rod portion 21. Since the refrigerant inside the heat insulating space d is retained, it is sufficient between the heat insulating space d and the inside of the inner pipe 23a, the passage 23c between the inner pipe 23a, the outer pipe 23b and the inner pipe 23a. It is possible to give different temperature differences. Therefore, low temperature corrosion of the exposed portion 21a in the exhaust passage 10 can be prevented.
【００１４】[0014]
【発明の効果】本発明に係る排気弁の冷却構造は、内燃
機関の排気弁を構成する排気弁棒の弁棒部に、この弁棒
部の先端に設けた弁傘部に至る穴を設け、この穴の中に
冷媒の供給管挿入し、この供給管を通じて弁部の周囲に
環状に設けたジャケットに冷媒を供給し、加熱した冷媒
を還流するようにしており、この供給管は前記穴の底部
まで冷媒を案内する内管と、前記ジャケットを冷却した
冷媒を還流する通路を、前記内管の外周部に形成する外
管との二重管構造に形成し、この外管は少なくとも弁棒
部が排気通路に露出している部分の長さを有しており、
更にこの外管と前記穴の内面との間に冷却水の滞留を許
容する断熱空間を形成している。In the exhaust valve cooling structure according to the present invention, the exhaust valve rod forming the exhaust valve of the internal combustion engine is provided with the hole extending to the valve head portion provided at the tip of the exhaust valve rod. , The refrigerant supply pipe is inserted into this hole, the refrigerant is supplied to the jacket annularly provided around the valve portion through this supply pipe, and the heated refrigerant is refluxed. The inner pipe for guiding the refrigerant to the bottom of the inner pipe, and the passage for returning the refrigerant that has cooled the jacket are formed in a double pipe structure with an outer pipe formed on the outer peripheral portion of the inner pipe. The rod has the length of the part exposed to the exhaust passage,
Further, a heat insulating space is formed between the outer pipe and the inner surface of the hole to allow the retention of cooling water.
【００１５】従って、冷媒は二重構造の供給管の内管を
流入し、弁傘部を冷却した後にこの二重管の内部を還流
する。一方、前記断熱空間には冷媒が滞留しているので
比較的高い温度を保つことができ、排気弁棒の弁棒部の
排気通路内に露出している部分の低温腐蝕を防止でき、
結果として耐久性を向上させることができるという効果
がある。Therefore, the refrigerant flows into the inner pipe of the double-structured supply pipe, cools the valve head portion, and then returns to the inside of the double pipe. On the other hand, since the refrigerant is retained in the heat insulating space, it is possible to maintain a relatively high temperature, and it is possible to prevent low temperature corrosion of the exposed portion of the valve rod portion of the exhaust valve rod in the exhaust passage,
As a result, there is an effect that the durability can be improved.
【図１】本発明による排気弁棒の要部側面図である。FIG. 1 is a side view of a main part of an exhaust valve rod according to the present invention.
【図２】図１のＡ部拡大図であるFIG. 2 is an enlarged view of part A of FIG.
【図３】図１のＢ部拡大図である。FIG. 3 is an enlarged view of part B in FIG.
【図４】従来の内燃機関の要部を示す側断面図である。FIG. 4 is a side sectional view showing a main part of a conventional internal combustion engine.
【図５】従来の排気弁の先端部の側断面図である。FIG. 5 is a side sectional view of a tip portion of a conventional exhaust valve.
【図６】図５の弁体の平断面図である。6 is a plan sectional view of the valve body of FIG.
【図７】排気弁の腐食を示す特性図である。FIG. 7 is a characteristic diagram showing corrosion of an exhaust valve.
１ 排気弁 ２ 排気弁棒 ２ａ 触火面 ３
弁傘部 ４ 穴 ５ 弁棒部 ６ 供給管 ７ 冷媒供給
通路 ８ 冷媒戻し通路 ９ ジャケット １０ 排気通
路 １１ 燃焼室 ２０ 排気弁 ２１ 弁棒部 ２２ 穴 ２３
供給管 ２３ａ 内管 ２３ｂ 外管 ２３ｃ 通路 ２
４ シール具 ２５ 弁部 ２５ａ 触火面 ２６ ジャケット ｄ 断熱空間1 Exhaust valve 2 Exhaust valve rod 2a Fire surface 3
Valve head 4 hole 5 Valve rod 6 Supply pipe 7 Refrigerant supply passage 8 Refrigerant return passage 9 Jacket 10 Exhaust passage 11 Combustion chamber 20 Exhaust valve 21 Valve rod 22 Hole 23
Supply pipe 23a Inner pipe 23b Outer pipe 23c Passage 2
4 Sealing tool 25 Valve part 25a Touch surface 26 Jacket d Insulation space
Claims (3)
弁棒部に、この弁棒部の先端に設けた弁傘部に至る穴を
設け、この穴の中に冷媒の供給管挿入し、この供給管を
通じて弁部の周囲に環状に設けたジャケットに冷媒を供
給し、加熱した冷媒を還流するようにしており、この供
給管は前記穴の底部まで冷媒を案内する内管と、前記ジ
ャケットを冷却した冷媒を還流する通路を、前記内管の
外周部に形成する外管との二重管構造に形成し、この外
管は少なくとも弁棒部が排気通路に露出している部分の
長さを有しており、更にこの外管と前記穴の内面との間
に冷却水の滞留を許容する断熱空間を形成している排気
弁の冷却構造。1. A valve rod portion of an exhaust valve rod constituting an exhaust valve of an internal combustion engine is provided with a hole reaching a valve head portion provided at a tip of the valve rod portion, and a refrigerant supply pipe is inserted into the hole. Then, the refrigerant is supplied to the jacket annularly provided around the valve portion through the supply pipe, and the heated refrigerant is circulated, and the supply pipe is an inner pipe that guides the refrigerant to the bottom of the hole, A passage for returning the refrigerant that has cooled the jacket is formed in a double pipe structure with an outer pipe formed on the outer peripheral portion of the inner pipe, and at least the valve rod portion of the outer pipe is exposed in the exhaust passage. The cooling structure for the exhaust valve, which has a length of 10 mm and further forms a heat insulating space that allows the retention of cooling water between the outer pipe and the inner surface of the hole.
通路と連結している請求項１記載の断熱空間。2. The heat insulating space according to claim 1, which is connected to a passage formed between a double pipe composed of an outer pipe and an inner pipe.
されている請求項１記載の断熱空間。3. The heat insulating space according to claim 1, which is formed in the valve rod portion exposed in the exhaust passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32872293A JPH07180549A (en) | 1993-12-24 | 1993-12-24 | Cooling structure for exhaust valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32872293A JPH07180549A (en) | 1993-12-24 | 1993-12-24 | Cooling structure for exhaust valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07180549A true JPH07180549A (en) | 1995-07-18 |
Family
ID=18213454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32872293A Withdrawn JPH07180549A (en) | 1993-12-24 | 1993-12-24 | Cooling structure for exhaust valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07180549A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401997A (en) * | 2015-10-30 | 2016-03-16 | 重庆奇甫机械有限责任公司 | Spiral flow guiding and sodium injecting air valve with branch channels |
-
1993
- 1993-12-24 JP JP32872293A patent/JPH07180549A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401997A (en) * | 2015-10-30 | 2016-03-16 | 重庆奇甫机械有限责任公司 | Spiral flow guiding and sodium injecting air valve with branch channels |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010306 |