JPH0444098B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a Stirling engine, and particularly relates to an improvement in a pressure generation mechanism for increasing efficiency, quiet operation, and simplifying assembly of the Stirling engine. .

[Prior art]

An example of a typical structure of a conventional Stirling engine power transmission mechanism is shown in FIG. In the figure, 1 is the crankcase,
All parts of the Stirling engine are assembled and configured based on this part. 2 is crank case 1
3 is a bearing housing that is fastened and fixed to the crankcase 1 in the same way as flange 2, 4 is a flange that is fastened and fixed to the crankcase 1, and 5 is a bearing housing. 3 is a bearing fixed to the flange 2, and 6 is a bearing fixed to the flange 2. 7 is a crankshaft rotatably held by bearings 5 and 6;
It transmits the power generated by the Stirling engine to the outside. Reference numeral 8 denotes a mechanical seal attached to the crankshaft 7 for sealing off the gas sealed within the crankcase 1. 9 and 10 are the crankshaft 7 of the Stirling engine
This is a balance weight for balancing the rotation of the crankshaft 7, and is fixed to the crankshaft 7.

Reference numeral 14 denotes lubricating oil collected at the bottom of the crankcase 1 for lubricating the moving parts of the Stirling engine. Reference numeral 15 is a splasher for splash lubrication, which is usually attached to a connecting rod for a displacer or a connecting rod for a power piston.

Reference numerals 11 and 12 denote power piston conrods connected to the crankshaft 7 by bearings, and 21 a crosshead connected to the power piston conrods 11 and 12. This crosshead 21
A power piston rod 22 and a power piston 18 are fixedly connected to the power piston rod 22 and the power piston 18, respectively. Further, the outer periphery of the crosshead 21 is fitted to the inner periphery of the cylinder 20 so as to be able to slide back and forth with a bearing function.

13 is a stove for the displacer;
It is rotatably coupled to the crankshaft 7 by a bearing. 16 is a piston pin, 17 is a displacer piston rod, and 19 is a displacer piston. The displacer piston rod 17 is connected to the displacer connecting rod 13 by the piston pin 16. The displacer piston rod 17 passes through the crosshead 21, the power piston rod 22, and the center of the circular cross section of the power piston 18, and is fixedly connected to the displacer piston 19.

20 is a cylinder fixed to the upper part of the crankcase 1, and inside this cylinder 20, a displacer piston 19 and a power piston 18 are installed.
is designed to slide back and forth.

Note that the explanation of structural parts such as the combustor section and the heat exchanger section of the Stirling engine will be omitted.

Next, the operation will be explained.

So-called 1 cylinder, 2 cylinders as shown in Figure 1
In a crankshaft type Stirling engine with pistons arranged in series, the pressure fluctuations generated in the cylinder 20 (the pressure generation mechanism is omitted) are transferred to the power piston 1.
8, which is converted into force and transmitted to the power piston rod 22, crosshead 21, and power piston connecting rods 11 and 12. The rotational work is then taken out from the crankshaft 7.

A portion of the rotational work is transmitted to the displacer piston 19, inducing reciprocating motion and causing it to operate as a Stirling engine.

In such a conventional Stirling engine, the power piston 18 that generates axial force is connected to the crankshaft 7 via the crosshead 21 with two power piston connection rods 11 and 12, thereby transmitting power. There is. In addition, in order to assemble and fit two types of pistons, the displacer piston 19 and the power piston 18, into one cylinder 20, a hole is machined in the center of the power piston 18, and a hole is formed in the center of the power piston 18. This is connected to a displacer piston 19 through a rod 17.

As mentioned above, the Stirling engine with the conventional structure as shown in FIG.
It is necessary to match the spacing between the large end axes and the small end axes of Nos. 1 and 12 with a precision comparable to that of the bearing clearance, which poses problems in terms of processing, cost, and ease of assembly. It was hot. Furthermore, if the lengths of the two connecting rods 11 and 12 were not accurate, the load would be applied to only one of them, which would lead to a decrease in operational reliability.

Furthermore, since the displacer piston 19 is assembled by drilling a hole in the center of the power piston 18 and passing the displacer piston rod 17 through it, there is also a problem in assembly. Furthermore, since the two pistons perform vertical and reciprocating motion, reciprocating inertia becomes large, which hinders reduction in vibration.

[Summary of the invention]

The present invention has been made in view of these points,
A main piston that reciprocates and an auxiliary piston that rotates eccentrically in conjunction with the main piston are incorporated into the main and auxiliary cylinders, respectively, and a mechanism that generates reciprocating driving force is reciprocated within the main cylinder and the auxiliary piston. A mechanism for generating pressure fluctuations is constructed of a main piston, an auxiliary cylinder, an auxiliary piston, and a mechanism for generating pressure fluctuations.
By adopting a structure with two vanes that separate the low-temperature space, it is possible to simplify assembly, improve operational reliability, and promote low vibration. The aim is to provide a Stirling engine with a completely new structure that has never been seen before.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows a schematic diagram of a Stirling engine according to an embodiment of the present invention, and in the figure, 3
1 is a cylindrical auxiliary cylinder, 32 is a crankshaft whose rotation center is at the center of the cylinder 31, and a crankshaft eccentric portion 32a eccentric to the crankshaft is provided in a part thereof. 33 is a rolling cylinder that is rotatably and slidably fitted to the outer circumferential portion of the crankshaft eccentric portion 32a;
2a and the rolling cylinder 33 constitute a rolling piston 34 that eccentrically rotates inside the auxiliary cylinder 31. 35 and 36 are vane grooves machined in the radial direction in a part of the auxiliary cylinder 31, and inside thereof are vanes 37 and 38, respectively.
is inserted so as to be able to reciprocate and slide, and each vane 3
7 and 38 are pressed against the outer peripheral surface of the rolling piston 34 by springs 39 and 40. 41,4
Reference numerals 2, 43, and 44 are gas passages formed in the auxiliary cylinder 31 to allow the gas inside the auxiliary cylinder 31 to flow. 51 is gas passage 4
1, 43 and 52 are gas pipes that communicate the gas passages 42, 44, and these gas pipes 51, 52
A heat exchanger consisting of heaters 45, 46, coolers 47, 48, and regenerators 49, 50 is arranged.

53 is a gas passage formed in the auxiliary cylinder 31, 55 is the main cylinder of the reciprocating engine section, 56 is a power piston, and 57 is a connecting rod for the power piston. 54 is a space 62 constituted by the main cylinder 55 and the power piston 56, and the auxiliary cylinder 3.
This is a gas pipe that connects the gas passage 53 of No. 1.
59 is the auxiliary cylinder 31 and the rolling piston 3
4 and vanes 37 and 38, and similarly, 60 is a low temperature space. The shaft 58 to which the power piston connecting rod 57 is connected is coaxial with the crankshaft 32.

FIG. 3 is a diagram showing the operating principle for explaining one embodiment of the present invention, and FIG. 4 is a diagram showing the pressure fluctuation inside the cylinder as the crankshaft rotates in relation to the rotation angle. In Fig. 3, O is the crankshaft 32
The center of P is the center of the crankshaft eccentric portion 32a. Further, θ is the rotation angle of the crankshaft.

FIG. 5 is a cross-sectional view of the structure of the embodiment shown in the schematic diagram of FIG. 2 when configured as an actual engine, and is a horizontal cross-sectional view of the crankshaft. 49, 50, and cooler 4
7 and 48 are omitted to simplify the explanation. In the figure, 71 is a crankcase, 72 and 73 are crankcase cylinder parts, 75 and 76 are bearings that are fixed to the crankcase cylinder parts 72 and 73 and rotatably hold the crankshaft 32, 77 is inside the crankcase,
Mechanical system for sealing the gas inside the cylinder
It's a sticker. 78 and 79 are end plates fixed to both ends of the auxiliary cylinder 31;
1. Vanes 37, 38, rolling piston 34
A high temperature space 59 and a low temperature space 60 are formed by the above. 80 is a bearing fixed to the end plate 79;
1 is a flange, and an end plate 78 is fixed to the crankcase cylinder portion 73. In addition, vane 37,
38, springs 39, 40, etc. are also omitted from this figure. FIG. 2 schematically shows a cross section taken along the - line in FIG. 5.

Next, the operation will be explained.

In this Stirling engine as shown in FIG. 2, as the crankshaft 32 rotates, the rolling piston 34 performs an eccentric rotational movement inside the auxiliary cylinder 31, so that a high temperature space 59 partitioned by vanes 37 and 38 is generated. and the volume of the low temperature space 60 increases or decreases. Further, since the volume of the power piston space 62 also increases or decreases as the crankshaft 32 rotates, the total low temperature space volume increases or decreases as the crankshaft 32 rotates.

The high temperature space 59 and low temperature space 60 are
Heaters 45, 46, regenerators 49, 50, cooler 4
Since they are connected and ventilated by gas pipes 51 and 52 equipped with gas pipes 7 and 48, if the volume of the low temperature space 60 and the high temperature space 59 increases or decreases due to the rotation of the crankshaft 32, the flow from the high temperature space 59 to the low temperature space 60 or Gas flows back and forth from the low-temperature space 60 to the high-temperature space 59, and the pressure of the entire cylinder 31 changes accordingly. This operation is the same as that of the well-known Stirling engine. That is, as the rotation angle θ of the crankshaft 32 changes as shown in FIGS. 3 and 4, the pressure inside the auxiliary cylinder 31, that is, the pressure in the power piston space 62, changes as shown in FIG. 4, for example. Changes to As a result, this pressure change acts on the power piston 56, and rotational power can be obtained, making it possible to perform the same operation as a conventional Stirling engine.

In the device of this embodiment, the pressure generating mechanism is changed from the conventional reciprocating piston type to the rolling piston type, so that it is possible to perform the same operation as the conventional one, and also to reduce noise.
Quiet operation can be achieved, and since there is only one reciprocating piston portion, the power piston 56, the reciprocating inertia is smaller than that of the conventional one, allowing for low-vibration operation. Furthermore, since the driving force is generated by the reciprocating main piston, the driving force generating mechanism can have a simple structure consisting of only the piston and its cylinder. Furthermore, since the connecting rod for the power piston can be constructed with a single connecting rod, there is no need to make two connecting rods with high precision as in the past, making the structure and assembly extremely simple, improving reliability and reducing manufacturing costs. Can be reduced.

In addition, in the above embodiment, the two vanes are provided at opposing positions (180° interval), but this does not necessarily have to be provided at opposing positions.
As shown in FIG. 6, even if the position of the vane groove formed in the cylinder 63 is changed and the position of the vane 38 is shifted so as to reduce the volume of the high-temperature space 59, the same operation and effect as in the above embodiment can be obtained. I can do it.
Note that, as shown in FIG. 6, if the vanes are positioned so that the volume of the high temperature space 59 is reduced, the output of the Stirling engine can be reduced. Conversely, if the vanes 38 are set so that the high temperature space 59 becomes large, the output can be increased.

〔Effect of the invention〕

As described above, according to the present invention, a main piston that reciprocates and an auxiliary piston that rotates eccentrically in conjunction with the main piston are separately incorporated into the main and auxiliary cylinders, and a mechanism for generating reciprocating driving force is provided. , a mechanism that is composed of the main cylinder and a main piston that reciprocates within the main cylinder and generates pressure fluctuations, and the auxiliary cylinder, the auxiliary piston, and the piston, and the inside of the auxiliary cylinder are divided into the high and low temperature spaces. The structure has two vanes, which simplifies assembly, improves operational reliability, and reduces vibration.The mechanism that generates the reciprocating drive force can also be simplified in structure. processing,
This has the effect of providing a Stirling engine that is easy to assemble, has low manufacturing costs, and can achieve low vibration, low noise, and quiet operation.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a typical structure of a power transmission mechanism of a conventional Stirling engine, Figs. 2 and 3 are schematic diagrams of a Stirling engine according to an embodiment of the present invention, and Fig. 4 is a diagram showing a typical structure of a power transmission mechanism of a conventional Stirling engine. FIG. 5 is a schematic cross-sectional configuration diagram of a Stirling engine according to an embodiment of the present invention, and FIG. 6 is a diagram showing another embodiment of the present invention. . 31... Auxiliary cylinder, 32, 58... Crankshaft (rotating shaft), 32a... Crankshaft eccentric part,
33... Rolling cylinder, 34... Rolling piston, 35, 36... Vane groove, 37, 3
8... Vane, 39, 40... Spring, 4
5,46... Heater, 49,50... Regenerator, 4
7, 48... Cooler, 51, 52... Gas piping (first passage), 54... Gas piping (second passage),
55...Main cylinder, 59...High temperature space, 60...
...Low temperature space, 62...Inner space of the main cylinder. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A closed space that communicates a high-temperature space and a low-temperature space, and includes main and auxiliary pistons that generate volume changes in each of the high and low-temperature spaces; In a Stirling engine that generates pressure fluctuations in the high and low temperature spaces by heating and cooling the fluid moving in the closed space to generate a reciprocating driving force for the main piston, the reciprocating main piston and the The mechanism for generating the reciprocating driving force is composed of the main cylinder and the main piston that reciprocates within the main cylinder, and an auxiliary piston that moves eccentrically and rotates in the main cylinder and an auxiliary piston that moves eccentrically. A Stirling engine characterized in that a mechanism for generating fluctuations has a structure including the auxiliary cylinder, the auxiliary piston, and two vanes that partition the inside of the auxiliary cylinder together with the piston into the high and low temperature spaces. 2. The Stirling engine according to claim 1, wherein the main cylinder and the auxiliary cylinder are connected by a rotating shaft, and the rotating shaft is a crankshaft. 3. The Stirling engine according to claim 1 or 2, wherein the auxiliary cylinder is formed in a cylindrical shape, and the rotating shaft is located at the center of the auxiliary cylinder. 4. A patent characterized in that the auxiliary piston is a rolling piston comprising an eccentric part provided eccentrically with respect to the rotating shaft, and a rolling cylinder fitted to the outer periphery of the eccentric part so as to be rotatable and slidable. A Stirling engine according to any one of claims 1 to 3. 5. According to any one of claims 1 to 4, wherein the vane is slidably disposed in two grooves formed in a radial direction in a part of the auxiliary cylinder. Sterling institution listed. 6. The Stirling engine according to claim 5, wherein the vane is pressed against the outer peripheral surface of the rolling piston by a spring disposed in the groove.