WO1986004958A1

WO1986004958A1 - Stirling engine

Info

Publication number: WO1986004958A1
Application number: PCT/JP1986/000056
Authority: WO
Inventors: Tetsuya Honda; Toshihide Koda; Kazuo Kashiwamura; Kiyoshi Taketoh; Tadahiro Yoshida
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1985-02-14
Filing date: 1986-02-12
Publication date: 1986-08-28
Also published as: JPS61187565A

Abstract

Structure for preventing the propagation of a lubricating oil in a Stirling engine. The lubricating oil, with which the portion between a crosshead (13) and a cylinder (16) has been lubricated, scattered into a space between the crosshead (13) and a power piston (15) is absorbed by an oil absorbing member (17) provided in the same space, to prevent the propagation of the lubricating oil from the crosshead (13) to the power piston (15) and thereby improve the operation efficiency and reliability of the Stirling engine.

Description

Specification

Title of invention

Staling organization

Technical field

The present invention relates to a starting engine, and more particularly to an improvement in operation reliability by preventing oil propagation and a reduction in weight and size.

Background art

Fig. 1 is shown, for example, in STIRLING ENGINE (OXFORD UNIVERSITY PRESS 1980) by G. WALKER. It is a cross-sectional view of such a conventional stirling engine. In the figure, (1) is a crankcase, in which all parts of the stirling engine are assembled and assembled based on this part. ( ² ) is a flange fixed to the hole machined in the crank case (1) with bolts or other fastening parts, (is a flange fixed to the crank case (1) as in the flange ( ² ). ( ⁴ ) is a flange fixed to the crankcase ( ⁴ ), ( ⁵ ) is a bearing fixed to the bearing housing ( ³ ), and ( ⁶ ) is a flange The bearing fixed to ( ² ), the crankshaft (7), which is held in rotation by the bearings (5) and (6), and is used to transfer the power generated by the staring engine to the outside It is transmitted to. ( ⁸ ) is a mechanical 'seal attached to the crankshaft (which has the effect of sealing the gas inside the crankcase (1). ( ⁹ ) and 0 are the crankshaft shafts. This balance weight is used to balance the rotation of the shaft, and is fixed to the crank shaft ( ⁷ ). (Π), α¾ are power piston connectors connected to the crankshaft (7) by bearings, and are connected to power piston connectors, ^ Crosshead, including powerstone rods and nozzles.ヮビス is connected. The outer circumference of the crosshead is engaged with the inner circumference of the cylinder with a bearing effect so that it can reciprocate. ^ Is an airtight wall which is in close contact with the power piston rod 4 and the cylinder ^, and is fitted with a mouth seal (not shown). The power piston is from the crosshead side. This prevents oil from spreading to the ^ side and gas inflow. ^ Is a pressure buffer chamber with a relatively large volume that absorbs pressure fluctuations generated in the space between the power piston ^ and the airtight wall ^ during operation of the Stirling engine. ^ Is a displacer connector, which is rotatably connected to the crankshaft and bearings. ^ The piston door Npin, ^ in the lock de for de Lee Buresa, the piston tons pin ^ is coupled to the display server for the child Nro' de ^ as a contact, Mataku Russia Suhe' de, Russia for Nono ⁰ Wa over piston tons head of 4>, which is fixedly coupled to the de-spray services t ^ through the Nono ⁰ Wa over piston t ^. ^ Is the lubricating oil for lubricating the moving parts of the Stirling engine that has accumulated at the bottom of the crankcase (1).

The description of the structural parts such as the combustor and the heat exchanger of the stall engine is omitted. Next, the operation of the conventional Stirling engine will be described. As shown in Fig. 1, in a so-called 1-cylinder, 2-axis, series-aligned, crankshaft-type staring engine, the pressure fluctuation generated in the cylinder ^ (the pressure generation mechanism) acts on ^ is omitted) force power over bis tons, power over pin scan tons for Rod four is converted to the force), click b Suhe' de ^, Nono ⁰ Wa over piston tons for co Nro' ) Is transmitted to. Then, the rotating work is output to the outside by the crank shaft. A part of this rotating work is transmitted to the display service tongue, which causes reciprocating movement to operate as a starting engine.

With the above operation, the oil scattered from the sliding surface composed of the outer periphery of the crosshead ^ and the inner periphery of the cylinder is removed from the outer periphery of the power piston rod ^ and the cylinder. The inside of ^ is sealed with an airtight wall, which prevents oil from entering the power piston ^ side. During operation, pressure fluctuations occur in the space between the power piston ^ and the airtight wall ^, so a pressure buffer chamber ^ is provided outside the engine to absorb the fluctuations.

* Q o

In the above-described conventional Stirling engine, during operation, oil scatters in a mist from the sliding surface consisting of the outer circumference of the oil-lubricated crosshead ^ and the inner circumference of the cylinder ^ attached to rod for over bis tons, to propagate from the slight clearance Nono ⁰ Wa over piston tons for rod de ^ airtight walls to power over bis tons side, the oil shea Li Sunda ^ in Flows into the heat exchanger (illustrated ), Significantly reducing the efficiency and reliability of operation. In addition, since a pressure buffer chamber is required outside the engine, there is a problem that the weight and shape of the engine are both increased.

The present invention has been made to solve such problems, and by preventing oil from propagating to the power piston side, a highly efficient and reliable starting machine. The purpose is to obtain.

Another object of the present invention is to provide a small and lightweight starting engine in addition to the above objects.

Disclosure of the invention

A staring engine according to the present invention includes a power piston for obtaining an output of the staring engine, a power piston rod connected to the power piston, and a power piston rod connected to the power piston. A cross head that is connected to the power piston through a rod for the service piston and that reciprocates in the same manner as the power piston is provided in the cylinder. And an oil absorbing material that lubricates between the cylinder and the cylinder and absorbs oil existing in the space between the crosshead and the power piston.

In addition, a staring engine according to another invention of the present invention, in the above-mentioned engine, further includes a mechanism for converting a reciprocating motion into a rotational motion, and a crank case for housing the mechanism. The space in which the oil absorbing material is placed communicates with the crank chamber. In the present invention, the oil absorbent having air permeability and oil absorbency absorbs oil scattered from the crosshead side. Also, because the oil absorbent is in contact with the rod for power piston, Oil adhering to the piston rod can also be absorbed, so if there is enough space to prevent the oil absorbent from contacting the power piston, the oil will not propagate to the power piston side. As a result, the operating efficiency and reliability of the starting engine can be improved.

Further, in another aspect of the present invention, by communicating the crankcase with the space containing the oil absorbing material, when the oil absorbed by the oil absorbing material becomes an appropriate amount, the oil is absorbed by gravity. Then, it returns to the bottom of the crankcase, and the effect of the invention can be maintained for a long time. Furthermore, when these communication holes are used in combination as a gas flow path, the inside of the crankcase can be used as a buffer chamber for pressure fluctuations. Therefore, it is not necessary to provide a buffer chamber for pressure fluctuations outside, and the Stirling engine can be reduced in size and weight.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view showing a conventional starting engine, FIG. 2 is a cross-sectional view showing one embodiment of the present invention, and FIG. 3 shows an oil absorbing material according to another embodiment of the present invention. It is sectional drawing. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 2 is a cross-sectional view showing an embodiment of the present invention, in which (1) to ^ and ^ to ^ are exactly the same as those of the above-mentioned conventional device. -belongs to. Is an oil-absorbing material provided in the space between the crosshead ^ and the power screw ^ which is made of a breathable and oil-absorbing material. Absorbs oil splattered from the door and oil attached to the powerston rod. The oil absorbing material is connected to and held by the power piston rod and reciprocates. (18a) and Cl 8b) are the first and second communication holes, respectively, that connect the space containing the oil absorbent (1?) And the space in the crankcase, that is, the space in the crankcase (1). Yes, (18a) is provided on the crosshead (^), and (18b) is provided on the wall of the cylinder ^ and the crankcase (1).

In the above-structured Stirling engine, a cross head that reciprocates with oil lubrication along the inner wall of the cylinder and a power piston that reciprocates without lubrication Oil scattered from the crosshead is absorbed by a gas-permeable and oil-absorbing material provided in the space between the ton. In addition, since the oil absorbent W is also in contact with the rod for the titanium piston 4), the oil adhering to the rod () is also absorbed, so that the oil to the power piston ^ side is absorbed. Is obtained. When the oil absorbed by the oil absorbent ^ reaches a certain amount, it is returned to the oil reservoir at the bottom of the crankcase (1) through the communication holes Cl8a) and Cl8b).

¾ o

In the above embodiment, the power piston rod has an inner diameter of The outer diameter of α and the outer diameter are oil absorbers with the same diameter as the inner diameter of cylinder ^), but the outer diameter is smaller than the inner diameter of cylinder ^ as shown in Fig. 3. The same effect can be obtained by fixing the oil absorbent ^ with a smaller diameter with the oil absorbent retainer ^ fixed to the cylinder (6).

In addition, the material of the oil absorbent ^ is partially or entirely made of resin-based sponge, foamed metal, or mesh metal or a layer thereof, and is air-permeable and oil-absorbent. Anything should do.

In addition, the oil absorbed by the oil absorbing material ^ is returned to the oil reservoir at the bottom of the original crankcase (1) to maintain the prevention of oil transmission to the power biston ^ side for a long time. The one provided in the crosshead ^ is the communication hole (18a), and the one provided in the cylinder is

(18b), the communication holes Cl8a) and (18b) can also be used as a gas flow path for using the crankcase (1) as a buffer chamber for pressure fluctuation.

Further, in the above-described embodiment, the case where two communication holes (18a) and (18b) are provided is shown. However, when only one of them is provided, the same effect as in the above-described embodiment can be obtained.

Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is used for preventing the propagation of lubricant in a Stirling engine, but can be applied to prevent the propagation of lubricant in other equipment.

Claims

The scope of the claims

1. A power piston that obtains the output of a Stirling engine and reciprocates in a cylinder, and a nozzle connected to this power piston. Wa chromatography bis tons for rod-de, this Nono ⁰ Wa bis tons for Lock is coupled to the power over piston tons via de, inside the sheet re Sunda. To the same shuttled the Pawa over bis tons It is provided in the space between the cross head that moves and the space between the cross head and the power piston, and lubricates the space between the cross head and the cylinder to the space. A stirrer equipped with an oil absorbing material that absorbs existing oil.

2. The starting machine according to claim 1, wherein the oil absorbent contacts the rod for the power piston.

3. The starting engine according to claim 1, wherein at least a part of the oil absorbing material is a resin sponge.

4. The stirrer according to claim 1, wherein at least a part of the oil absorbing material is a foamed metal.

5. The Stirling engine according to claim 1, wherein at least a part of the oil absorbing material is a mesh metal.

6. A power piston that obtains the output of the starting engine and moves back and forth in the cylinder, a rod for the No. ⁰ piston connected to this power piston, The power piston is connected to the power piston through the power piston rod, A cross head that reciprocates in the same manner as the power piston in the cylinder, and is provided in the space between the cross head and the power piston, and the cross head and the power head An oil absorbing material that lubricates the cylinders to absorb the oil present in the space, a mechanism that converts reciprocating movement into rotational movement, a crank chamber that houses this mechanism, and this crank chamber A starting institution equipped with a means for communicating with the above space.

7. The stirrer according to claim 6, wherein the means for communicating the crank chamber with the space is a communication hole provided in the crosshead.

8. The stirling engine according to claim 6, wherein the means for communicating the crank chamber with the space is a communication hole provided in the cylinder.