JPH03277873A - Rod sealing device for stirling engine - Google Patents

Rod sealing device for stirling engine

Info

Publication number
JPH03277873A
JPH03277873A JP2074040A JP7404090A JPH03277873A JP H03277873 A JPH03277873 A JP H03277873A JP 2074040 A JP2074040 A JP 2074040A JP 7404090 A JP7404090 A JP 7404090A JP H03277873 A JPH03277873 A JP H03277873A
Authority
JP
Japan
Prior art keywords
pressure chamber
pressure
rod
sealing
piston
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.)
Pending
Application number
JP2074040A
Other languages
Japanese (ja)
Inventor
Hiroyuki Katsuta
洋行 勝田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Priority to JP2074040A priority Critical patent/JPH03277873A/en
Publication of JPH03277873A publication Critical patent/JPH03277873A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/0535—Seals or sealing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

PURPOSE:To prevent the rise of oil to a working piston side by installing a unidirectional valve for allowing the flow of fluid from the first pressure chamber formed in an intermediate member between the second sealing member and the first sealing member into the second pressure chamber formed in the intermediate member between the first sealing member and a bearing member. CONSTITUTION:If a second sealing member 17 is not provided with direction performance in a sealing part, the pressure in the first pressure chamber 19 is held at the average pressure of the pressure variation in the back surface space of a working piston 10, and the pressure in the second pressure chamber 18 is secured to be over the pressure in the first pressure chamber 19 by a unidirectional valve 21. Accordingly, the action of the reverse pressure for deflecting the sealing part so as to be separated from a rod to a first sealing member 16 is prevented, and since the sealing part of the first sealing member 6 possesses the high sealing faculty for the shift of fluid from the second pressure chamber 18 side to the first pressure chamber 19 side, the superior sealing performance can be developed.

Description

【発明の詳細な説明】 ［発明の目的〕 （産業上の利用分野） 本発明は、オイルの作動空間への上がりを防止させてい
るスターリングエンジンのロッドシール装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rod seal device for a Stirling engine that prevents oil from rising into a working space.

（従来の技術） 従来のこの種のスターリングエンジンのロッドシール装
置として、特開昭６１−８７８５４号公報に示されるも
のがある。このものは、作動ピストンと該作動ピストン
にロッドを介して連結される出力取出機構との間にて、
固定部材にそのシール部が出力取出機構側から作動ピス
トン側への流体の移動に対し高い密封能力を有してロッ
ドに接するように第１のシール部材を支持させると共に
、該第１のシール部材と作動ピストンとの間にて、固定
部材にそのシール部が前記作動ピストン側から出力取出
機構側への流体の移動に対し高い密封能力を有してロッ
ドに接して固定部材内に第１のシール部材との間で空間
を形成する第２のシール部材を支持させて、両シール部
材間に形成される空間を作動ピストンの背面空間の圧力
変動の最低圧力に維持し、出力取出機構側から作動ピス
トン側へのオイルの上がりを防止している。(Prior Art) As a conventional rod seal device for a Stirling engine of this type, there is one disclosed in Japanese Patent Laid-Open No. 61-87854. This device has an output mechanism that is connected between an operating piston and an output extraction mechanism connected to the operating piston via a rod.
The first seal member is supported by the fixed member so that the seal portion has a high sealing ability against the movement of fluid from the output extraction mechanism side to the working piston side and contacts the rod, and the first seal member and the working piston, the fixed member has a first sealing portion within the fixed member in contact with the rod, the sealing portion of which has a high sealing ability against the movement of fluid from the working piston side to the output extraction mechanism side. A second seal member that forms a space between the seal member and the second seal member is supported to maintain the space formed between both seal members at the lowest pressure of the pressure fluctuation in the rear space of the working piston, and from the output extraction mechanism side. Prevents oil from rising to the working piston side.

（発明が解決しようとする課Ｂ） しかしながら、上記した従来の装置においては、以下の
ような問題を有する。(Problem B to be Solved by the Invention) However, the conventional device described above has the following problems.

即ち、両シール部材間に形成される空間を作動ピストン
の背面空間の圧力変動の最低圧力に維持しているため、
例えば、当該スターリングエンジンを最低圧力運転から
最高圧力運転に変化させ、作動ピストンの背面空間内の
圧力及び出力取出機構側の圧力が加圧された場合、第１
．第２のシール部材に必要以上に大きな圧力が作用して
しまい、両シール部材の耐久性が低下すると共に、ロッ
ドの摺動抵抗も著しく増大してしまう。That is, since the space formed between both seal members is maintained at the lowest pressure of the pressure fluctuation in the back space of the working piston,
For example, if the Stirling engine is changed from the lowest pressure operation to the highest pressure operation and the pressure in the back space of the working piston and the pressure on the output extraction mechanism side are pressurized, the first
．． An unnecessarily large pressure is applied to the second seal member, reducing the durability of both seal members and significantly increasing the sliding resistance of the rod.

この問題を解決するための手段として、本出願人は特願
平１−１９０１０９号にて、作動ピストンと中間部材と
の間に位置し且つそのシール部が出力取出機構側から作
動ピストン側への流体の移動に対し高い密封能力を有し
てロッドに気密的に接するように中間部材にシール部材
を支持し、該シール部材と中間部材間に形成される圧力
室を作動ピストンの背面空間に、作動ピストンの背面空
間から圧力室への流体の流通を許容し、圧力室から作動
ピストンの背面空間への流体の流通を阻止する一方向弁
を介して連通させ、圧力室を作動ピストンの背面空間の
圧力変動の最大圧力に維持させたロッドシール装置を提
案している。ところが、この装置においては、作動ピス
トンの位相によってはシール部材に大きな正圧が作用す
ることになるため、作動ピストンの背面空間に比較的に
大きなバッファタンクを連通させる必要があり、当該ス
ターリングエンジンの小型化の障害となる。As a means to solve this problem, the present applicant proposed in Japanese Patent Application No. 190109/1999 that the seal portion is located between the actuating piston and the intermediate member, and that the seal portion is connected from the output extraction mechanism side to the actuating piston side. A sealing member is supported on the intermediate member so as to have a high sealing ability against movement of fluid and is in airtight contact with the rod, and a pressure chamber formed between the sealing member and the intermediate member is provided in the back space of the actuating piston. The pressure chamber is communicated with the back space of the working piston through a one-way valve that allows fluid to flow from the back space of the working piston to the pressure chamber and prevents fluid flow from the pressure chamber to the back space of the working piston. We have proposed a rod seal device that maintains the maximum pressure of pressure fluctuations. However, in this device, a large positive pressure acts on the sealing member depending on the phase of the working piston, so it is necessary to connect a relatively large buffer tank to the back space of the working piston. This becomes an obstacle to downsizing.

そこで本発明は、当該スターリングエンジンにおいて、
エンジンの大型化及びシール部材の耐久性の低下等を招
くことなく、出力取出機構側から作動ピストン側へのオ
イルの上がりを防止することを、その技術的課題とする
。Therefore, the present invention provides, in the Stirling engine,
The technical problem is to prevent oil from rising from the output extraction mechanism side to the working piston side without causing an increase in the size of the engine or a decrease in the durability of the seal member.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） 上記した技術的課題を解決するために講じた手段は、当
該スターリングエンジンのロッドシール装置を、作動空
間を画成するスターリングエンジン用作動ピストンとそ
の出力取出機構とを連結させるロッドと、該ロッドを軸
受部材を介して気密的に支承する中間部材と、前記作動
ピストンと前記中間部材との間に位置し且つそのシール
部が前記出力取出機構側から前記作動ピストン側への流
体の移動に対し高い密封能力を有して前記ロッドに気密
的に接するように前記中間部材に支持された第１のシー
ル部材と、該第１のシール部材と前記作動ピストンとの
間に位置し且つそのシール部が前記ロッドに気密的に接
するように前記中間部材に支持された第２のシール部材
と、該第２のシール部材と前記第１のシール部材との間
で前記中間部材内に形成される第１の圧力室から前記第
１のシール部材と前記軸受部材との間で前記中間部材内
に形成きれる第２の圧力室への流体の流通を許容し、前
記第２の圧力室から前記第１の圧力室への流体の流通を
阻止する一方向弁とを備えた構成とすることである。(Means for solving the problem) The means taken to solve the above-mentioned technical problem is that the rod seal device of the Stirling engine is connected to the working piston for the Stirling engine that defines the working space and its output extraction mechanism. an intermediate member that airtightly supports the rod via a bearing member, and a sealing portion thereof is located between the operating piston and the intermediate member, and the sealing portion connects the operating piston from the output extraction mechanism side. a first sealing member supported on the intermediate member so as to be in airtight contact with the rod and having a high sealing ability against sideward movement of fluid; and a first sealing member and the actuating piston. a second seal member located between the intermediate member and supported by the intermediate member such that its seal portion is in airtight contact with the rod; allowing fluid to flow from a first pressure chamber formed within the intermediate member to a second pressure chamber formed within the intermediate member between the first sealing member and the bearing member; and a one-way valve that prevents fluid from flowing from the second pressure chamber to the first pressure chamber.

上記した構成からなるスターリングエンジンのロッドシ
ール装置は、前記第２のシール部材の前記シール部が前
記第１の圧力室から前記作動ピストン側への流体の移動
に対し高い密封能力を有して前記ロッドに気密的に接し
ていても良い。In the rod seal device for a Stirling engine having the above configuration, the seal portion of the second seal member has a high sealing ability against movement of fluid from the first pressure chamber to the working piston side. It may be in airtight contact with the rod.

（作用） 上記した手段によれば、第２のシール部材がそのシール
部に方向性を備えていない場合には、第２のシール部材
により第１の圧力室内の圧力は作動ピストンの背面空間
の圧力変動の平均圧力に保持され、第２の圧力室内の圧
力は一方向弁により第１の圧力室内の圧力よりも低い圧
力にならないように保証される。従って、第１のシール
部材にシール部をロッドから離間させるように撓ませる
逆圧が作用することがなく、また第１のシール部材のシ
ール部は第２の圧力室側から第１の圧力室側への流体の
移動に対し高い密封能力を有しているため、良好なシー
ル性を発揮することができ、スターリングエンジンの大
型化及びシール部材の耐久性の低下等を招くことなく、
出力取出機構側から作動ピストン側へのオイルの上がり
を防止することが可能となる。(Function) According to the above-mentioned means, when the second seal member does not have directionality in its seal portion, the pressure in the first pressure chamber is reduced by the second seal member to the back space of the actuating piston. The pressure in the second pressure chamber is maintained at an average pressure of the pressure fluctuations and is ensured by a one-way valve that the pressure does not fall below the pressure in the first pressure chamber. Therefore, there is no adverse pressure acting on the first sealing member that causes the sealing part to bend away from the rod, and the sealing part of the first sealing member is connected to the first pressure chamber from the second pressure chamber side. Because it has a high sealing ability against the movement of fluid to the side, it can demonstrate good sealing performance, without causing the Stirling engine to become larger or reducing the durability of the sealing member.
It is possible to prevent oil from rising from the output extraction mechanism side to the working piston side.

（実施例） 以下、本発明に従ったスターリングエンジンのロッドシ
ール装置の一実施例を図面に基づき説明する。(Example) Hereinafter, an example of a rod seal device for a Stirling engine according to the present invention will be described based on the drawings.

まず、図示しないスターリングエンジンの構成を簡単に
説明する。スターリングエンジンは膨張シリンダと圧縮
シリンダを備えており、各シリンダには夫々膨張ピスト
ン及び圧縮ピストンが気密的に摺動可能に嵌挿されてい
る。膨張ピストンは、膨張シリンダ内にそのヘッド部側
にて膨張室を画定していると共に、圧縮ピストンは、圧
縮シリンダ内にそのヘッド部側にて圧縮室を画成してい
る。膨張室と圧縮室とは、膨張室側から順次ヒータ（高
温熱交換器）、蓄熱器及び放熱器（低温熱交換器）を介
して連通されており、これにより膨張室と圧縮室との間
に１−１　ｅガス等の作動ガスが密封される作動空間が
形成されている。First, the configuration of a Stirling engine (not shown) will be briefly explained. The Stirling engine includes an expansion cylinder and a compression cylinder, and an expansion piston and a compression piston are fitted into each cylinder so as to be able to slide in an airtight manner. The expansion piston defines an expansion chamber within the expansion cylinder at its head side, and the compression piston defines a compression chamber within the compression cylinder at its head side. The expansion chamber and the compression chamber are communicated with each other via a heater (high temperature heat exchanger), a heat storage device, and a radiator (low temperature heat exchanger) sequentially from the expansion chamber side. 1-1 A working space is formed in which a working gas such as e-gas is sealed.

膨張ピストンは、ロッドを介して、クランクケースに形
成されるクランク室内に収容されるクランクシャフト等
の出力取出機構に連結されている。尚、ロッドの振れ即
ち膨張ピストンの振れは、膨張ピストンの背面側とクラ
ンクケース間に介装された中間部材に設けられロッドの
外周面に液密的に摺接する軸受部材により規制されるよ
うになっている。また、圧縮ピストンも膨張ピストンと
同様に構成されている。これにより、両ピストンはクラ
ンクシャフトの回転に応じて各シリンダ内を往復動され
ると共に、膨張ピストンは圧縮ピストンよりも進んだ所
定の位相差で往復動される。The expansion piston is connected via a rod to an output extraction mechanism such as a crankshaft housed in a crank chamber formed in the crankcase. Note that the vibration of the rod, that is, the vibration of the expansion piston, is regulated by a bearing member that is provided in an intermediate member interposed between the rear side of the expansion piston and the crankcase, and that slides in liquid-tight contact with the outer peripheral surface of the rod. It has become. Further, the compression piston is also configured similarly to the expansion piston. As a result, both pistons are reciprocated within each cylinder in accordance with the rotation of the crankshaft, and the expansion piston is reciprocated with a predetermined phase difference that is more advanced than the compression piston.

次に、本発明の要部を図面に基づき説明する。Next, main parts of the present invention will be explained based on the drawings.

第１図は、上述したスターリングエンジンにおけるｍｌ
ｌラドシール置の部分のみを示しており、第１図におい
て、１０は上述した膨張ピストン及び圧縮ピストンであ
る作動ピストンｌＯで、作動ピストンＩＯは図示しない
出力取出機構とロッド１１により連結されている。該ロ
ッド１１は、作動ピストン１１の背面側と図示しないク
ランクケース間に介装された中間部材１２に設けられた
上述した軸受部材１３により気密的に摺動可能に支承さ
れていると共に、ガイド′ピストン１４により中間部材
に支承されている。Figure 1 shows the ml in the Stirling engine mentioned above.
Only the Rad seal position is shown, and in FIG. 1, 10 is an operating piston IO which is the above-mentioned expansion piston and compression piston, and the operating piston IO is connected by a rod 11 to an output extraction mechanism (not shown). The rod 11 is slidably supported in an airtight manner by the above-mentioned bearing member 13 provided on the intermediate member 12 interposed between the rear side of the actuating piston 11 and the crankcase (not shown), and is also supported by the guide ' It is supported by a piston 14 on the intermediate member.

中間部材１２には、作動ピストンＩＯと中間部材１２と
の間にそのシール部（リップ部）が図示しないクランク
ケース内に連通されるクランク室１５から作動ピストン
１０側への流体の移動に対し高い密封能力を有してロッ
ド１１に気密的に接するように第１のシール部材１６が
支持されている。また、中間部材１２には、第１のシー
ル部材１６と作動ピストンＩＯとの間に方向性を有しな
いそのシール部（リップ部）がロッド１１に気密的に接
するように第２のシール部材１７が支持されている。こ
れにより、中間部＋１１２内に、第１のシール部材１６
と軸受部材１３との間に、第２の圧力室１８が形成され
ると共に、第１のシール部材１６と第２のシール部材１
７との間に第１の圧力室１９が形成されている。また、
作動ピストンｌＯと第２のシール部材１７との間にピス
トン背面空間２０が形成されている。尚、第１のシール
部材１６は、内周に形成されたリップ部をばねにより径
方向内方へ付勢されており、所定の荷重で常時ロッド１
１の外周面に液密的に摺接するようになっている。The intermediate member 12 has a seal portion (lip portion) between the operating piston IO and the intermediate member 12 that is high against the movement of fluid from the crank chamber 15 communicating with the crankcase (not shown) to the operating piston 10 side. A first seal member 16 is supported so as to have a sealing ability and come into airtight contact with the rod 11. Further, a second seal member 17 is attached to the intermediate member 12 so that the seal portion (lip portion) having no directionality is in airtight contact with the rod 11 between the first seal member 16 and the actuating piston IO. is supported. As a result, the first sealing member 16 is inserted into the intermediate portion +112.
A second pressure chamber 18 is formed between the first seal member 16 and the bearing member 13, and the first seal member 16 and the second seal member 1
A first pressure chamber 19 is formed between the first pressure chamber 19 and the second pressure chamber 7 . Also,
A piston back space 20 is formed between the working piston IO and the second seal member 17. Note that the first sealing member 16 has a lip formed on its inner periphery that is biased radially inward by a spring, so that the first sealing member 16 always closes the rod 1 under a predetermined load.
It is designed to come into liquid-tight sliding contact with the outer circumferential surface of 1.

また、中間部材１２には、第１の圧力室１９から第２の
圧力室１８への流体の流通を許容し、第２の圧力室１８
から第１の圧力室１９への流体の流通を阻止する一方向
弁２１が設けられている。Further, the intermediate member 12 allows fluid to flow from the first pressure chamber 19 to the second pressure chamber 18 .
A one-way valve 21 is provided to prevent fluid from flowing from the first pressure chamber 19 to the first pressure chamber 19 .

この一方向弁２１は、第１の圧力室１９内の圧力が第２
の圧力室１８内の圧力よりも大となると、直ちに第１の
圧力室１９内の圧力を第２の圧力室１８内に導入し、再
圧力をほぼ同圧又は第１の圧力室１９内の圧力〈第２の
圧力室１８内の圧力とさせる。This one-way valve 21 is configured such that the pressure inside the first pressure chamber 19 is
When the pressure in the first pressure chamber 18 becomes higher than that in the first pressure chamber 18, the pressure in the first pressure chamber 19 is immediately introduced into the second pressure chamber 18, and the pressure is increased again to approximately the same pressure or the pressure in the first pressure chamber 19. The pressure is the pressure in the second pressure chamber 18.

以上の構成からなる本実施例の作用を説明する。The operation of this embodiment having the above configuration will be explained.

図示しないクランクシャフトの回転により作動ピストン
ｌＯが往復動され、作動空間内の作動ガスの圧力が変動
し始め、それに伴いピストン背面空間２０の圧力が第２
図にＡで示す波形の如く、変動する。このピストン背面
空間２０の圧力変動は各シール部材１６．１７のリップ
部を撓ませ、クランク室１５内のオイルのピストン背面
空間２０側への上がりをひき起こす。それが、本実施例
においては、第２のシール部材１７により第１の圧力室
１９内の圧力は第２図にＢで示すようにピストン背面空
間２０の圧力変動の平均圧力に保持され、第２の圧力室
１８内の圧力は一方向弁２１により第１の圧力室１９内
の圧力よりも低い圧力にならないように保証される。従
って、第１のシール部材１２にリップ部を撓ませるよう
な逆圧が作用することがなく、また第１のシール部材１
６のリップ部は第２の圧力室１８側から第１の圧力室１
９側への流体の移動に対し高い密封能力を有しているた
め、良好なシール性を発揮することができる。また、第
２図に示すように、第１の圧力室１９と第２の圧力室１
８には、圧力差並びに、変動圧は作用しないため、第１
のシール部材１６の耐久性を向上することができる。尚
、第２図において、Ｃはクランク室１５の圧力変動を示
す。The working piston lO is reciprocated by the rotation of the crankshaft (not shown), and the pressure of the working gas in the working space begins to fluctuate, and accordingly, the pressure in the piston back space 20 increases to the second level.
The waveform fluctuates as shown by A in the figure. This pressure fluctuation in the piston back space 20 bends the lip portion of each seal member 16, 17, causing oil in the crank chamber 15 to rise toward the piston back space 20 side. However, in this embodiment, the pressure in the first pressure chamber 19 is maintained by the second seal member 17 at the average pressure of the pressure fluctuations in the piston back space 20, as shown by B in FIG. A one-way valve 21 ensures that the pressure in the second pressure chamber 18 does not become lower than the pressure in the first pressure chamber 19 . Therefore, there is no adverse pressure acting on the first sealing member 12 that would cause the lip portion to bend, and the first sealing member 1
6 is connected to the first pressure chamber 1 from the second pressure chamber 18 side.
Since it has a high sealing ability against the movement of fluid to the 9 side, it can exhibit good sealing performance. In addition, as shown in FIG. 2, the first pressure chamber 19 and the second pressure chamber 1
Since pressure difference and fluctuating pressure do not act on 8, the first
The durability of the seal member 16 can be improved. In addition, in FIG. 2, C indicates pressure fluctuations in the crank chamber 15.

以上のように、本実施例によれば、スターリングエンジ
ンの大型化及びシール部材の耐久性の低下等を招くこと
な（、出力取出機構側から作動ピストン側へのオイルの
上がりを防止することができる。As described above, according to this embodiment, it is possible to prevent oil from rising from the output extraction mechanism side to the working piston side without causing an increase in the size of the Stirling engine or a decrease in the durability of the sealing member. can.

第３図は、本発明の変形実施例を示し、第３図において
、第１図と同じ構成には第１図で用いた番号符号と同じ
番号符号を付し、説明は省略する。この実施例において
は、第２のシール部材１１７が、第１の圧力室１９から
ピストン背面空間２Ｏへの流体の移動に対し高い密封能
力を有してロッドに気密的に接するリップ部（シール部
）を有している。尚、この第２のシール部材１１７は第
１のシール部材１６と同様に、内周に形成されたリップ
部をばねにより径方向内方へ付勢されており、所定の荷
重で常時ロッド１１の外周面に液密的に摺接するように
なっている。FIG. 3 shows a modified embodiment of the present invention. In FIG. 3, the same components as in FIG. 1 are given the same numbers and symbols as those used in FIG. 1, and their explanations will be omitted. In this embodiment, the second seal member 117 has a lip portion (seal portion) that has a high sealing ability against the movement of fluid from the first pressure chamber 19 to the piston back space 2O and is in airtight contact with the rod. )have. Note that, like the first seal member 16, this second seal member 117 has a lip formed on its inner periphery that is biased radially inward by a spring, so that the rod 11 is always kept under a predetermined load. It is designed to slide into liquid-tight contact with the outer peripheral surface.

本実施例によれば、第４図にＢｏで示すように第１の圧
力室１９及び第２の圧力室１８は、ピストン背面空間２
０の圧力に保持され、スターリングエンジンの制御の１
つである圧力制御により、作動空間内の圧力を変化させ
た場合、どの過渡状態においてもピストン背面空間２０
から第１圧力室１９及び第２圧力室１８を経てクランク
室１５へのみ作動ガスの流れが生じる。従って、第１の
シール部材１６が破損して第１の圧力室１９内に侵入し
たり、また油膜厚さ分ロッド１１に付着して第１の圧力
室１９内に侵入したオイルが、ピストン背向空間２０内
に侵入するのを防止することができる。According to this embodiment, as shown by Bo in FIG. 4, the first pressure chamber 19 and the second pressure chamber 18 are connected to the piston back space 2
1 of Stirling engine control held at a pressure of 0
When the pressure in the working space is changed by pressure control, the piston back space 20
The working gas flows only from there to the crank chamber 15 via the first pressure chamber 19 and the second pressure chamber 18. Therefore, if the first seal member 16 is damaged and enters the first pressure chamber 19, or if the oil adheres to the rod 11 by the thickness of the oil film and enters the first pressure chamber 19, the oil may leak into the first pressure chamber 19. Intrusion into the space 20 can be prevented.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、エンジンの大型
化を招（ことな（、且つシール部材の耐久性が低下する
ことなく、出力取出機構側から作動ピストン側へのオイ
ルの上がりを防止することができ、オイル消費量を低減
させ且つ作動ガスへの混入による出力低下を防止するこ
とができる。As explained above, according to the present invention, it is possible to prevent oil from rising from the output extraction mechanism side to the working piston side without causing an increase in the size of the engine and without reducing the durability of the seal member. This makes it possible to reduce oil consumption and prevent a decrease in output due to mixing into the working gas.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明に従ったスターリングエンジンのロッド
シール装置の一実施例を示す断面図、第２図は第１図に
おけるピストン背面空間、クランク室、第１圧力室及び
第２圧力室の圧力変動を示す特性図、第３図は本発明の
変形実施例を示す断面図、第４図は第３図におけるピス
トン背面空間、クランク室、第１圧力室及び第２圧力室
の圧力変動を示す特性図である。 １０・・・作動ピストン、１１・・・ロッド、１２・・
・中間部材、１３・・・軸受部材、１６・・・第１のシ
ール部材、１７，１１７・・・第２のシール部材、１Ｂ
・・・第２の圧力室、１９・第１の圧力室、 ２ ・一方向弁。FIG. 1 is a sectional view showing an embodiment of a rod sealing device for a Stirling engine according to the present invention, and FIG. 2 is a sectional view showing the pressure in the piston back space, crank chamber, first pressure chamber, and second pressure chamber in FIG. FIG. 3 is a cross-sectional view showing a modified embodiment of the present invention, and FIG. 4 shows pressure fluctuations in the piston back space, crank chamber, first pressure chamber, and second pressure chamber in FIG. 3. It is a characteristic diagram. 10... Working piston, 11... Rod, 12...
- Intermediate member, 13... Bearing member, 16... First seal member, 17, 117... Second seal member, 1B
...Second pressure chamber, 19.First pressure chamber, 2.One-way valve.

Claims (2)

【特許請求の範囲】[Claims] （１）作動空間を画成するスターリングエンジン用作動
ピストンとその出力取出機構とを連結させるロッドと、
該ロッドを軸受部材を介して気密的に支承する中間部材
と、前記作動ピストンと前記中間部材との間に位置し且
つそのシール部が前記出力取出機構側から前記作動ピス
トン側への流体の移動に対し高い密封能力を有して前記
ロッドに気密的に接するように前記中間部材に支持され
た第１のシール部材と、該第１のシール部材と前記作動
ピストンとの間に位置し且つそのシール部が前記ロッド
に気密的に接するように前記中間部材に支持された第２
のシール部材と、該第２のシール部材と前記第１のシー
ル部材との間で前記中間部材内に形成される第１の圧力
室から前記第１のシール部材と前記軸受部材との間で前
記中間部材内に形成される第２の圧力室への流体の流通
を許容し、前記第２の圧力室から前記第１の圧力室への
流体の流通を阻止する一方向弁とを備えてなるスターリ
ングエンジンのロッドシール装置。(1) A rod that connects a Stirling engine working piston that defines a working space and its output extraction mechanism;
an intermediate member that airtightly supports the rod via a bearing member; and a seal portion located between the operating piston and the intermediate member that allows fluid to move from the output extraction mechanism side to the operating piston side. a first sealing member supported by the intermediate member so as to have a high sealing ability against the rod and being in airtight contact with the rod; and a first sealing member located between the first sealing member and the actuating piston; a second member supported by the intermediate member such that the seal portion is in airtight contact with the rod;
from a first pressure chamber formed in the intermediate member between the second seal member and the first seal member to between the first seal member and the bearing member. A one-way valve that allows fluid to flow to a second pressure chamber formed in the intermediate member and blocks fluid from flowing from the second pressure chamber to the first pressure chamber. Stirling engine rod seal device. （２）前記第２のシール部材の前記シール部が前記第１
の圧力室から前記作動ピストン側への流体の移動に対し
高い密封能力を有して前記ロッドに気密的に接している
ことを特徴とする請求項（１）に記載のスターリングエ
ンジンのロッドシール装置。(2) The seal portion of the second seal member is
The rod seal device for a Stirling engine according to claim 1, wherein the rod seal device has a high sealing ability against the movement of fluid from the pressure chamber to the working piston side and is in airtight contact with the rod. .
JP2074040A 1990-03-23 1990-03-23 Rod sealing device for stirling engine Pending JPH03277873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2074040A JPH03277873A (en) 1990-03-23 1990-03-23 Rod sealing device for stirling engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2074040A JPH03277873A (en) 1990-03-23 1990-03-23 Rod sealing device for stirling engine

Publications (1)

Publication Number Publication Date
JPH03277873A true JPH03277873A (en) 1991-12-09

Family

ID=13535658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2074040A Pending JPH03277873A (en) 1990-03-23 1990-03-23 Rod sealing device for stirling engine

Country Status (1)

Country Link
JP (1) JPH03277873A (en)

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