JPS60212658A - Stirling engine - Google Patents

Abstract

PURPOSE:To simplify machining and assembling while to reduce vibration and noise by constructing the mechanism for producing pressure to be applied onto a power piston in a stirling engine in rolling piston type. CONSTITUTION:An eccentric section 32G is provided on a crank shaft 32 supported rotatably in the center of a tubular auxiliary cylinder 31 then a rolling cylinder 33 is fitted rotatably to construct a rolling piston 34. Vanes 37, 38 are inserted slidably into the vane grooves 35, 36 of said cylinder 31 to slide against thus to define high and low temperature spaces 59, 60 in said cylinder 31. Said spaces 59, 60 are communicated through a heat exchanger comprised of heaters 45, 46, coolers 47, 48 and regenerators 49, 50, while the low temperature space 60 is communicated with a space between main cylinder 55 and power piston 56 of reciprocal engine.

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 of a pressure generating mechanism for increasing the efficiency of the Stirling engine, achieving quiet operation, and simplifying assembly. .

[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 a crankcase, and all parts of the Stirling engine are assembled and configured based on this part. 2
is a flange fixed to a hole machined in the crankcase 1 with a fastening part such as a bolt; 3 is a bearing housing fastened and fixed to the crankcase 1 in the same way as the flange 2; 4 is a flange fastened and fixed to the crankcase 1; 5 is a bearing fixed to the bearing housing 3, and 6 is a bearing fixed to the flange 2. A crankshaft 7 is rotatably held by bearings 5 and 6, and is used to transmit 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.

9.10 is a balance weight for balancing the rotation of the crankshaft 7 of the Stirling engine;
is fixed.

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 denotes a splasher for splash lubrication, which is usually attached to a connecting rod for a displacer or a connecting rod for a power piston.

11.12 is a power piston connecting rod connected to the crankshaft 7 by a bearing, and 21 is a crosshead connected to the power piston connecting rod 11.12. A power piston rod 22 and a power piston 18 are fixedly connected to this crosshead 21 . 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.

Reference numeral 13 denotes a displacer connecting rod, which is rotatably connected 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 is connected to the crosshead 21. Power piston rod 22. It passes through 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 portion fixed to the upper part of the crankcase 1, and inside this cylinder 20, a displacer piston 19. The power piston 18 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.

In the so-called one-cylinder, two-piston series-arranged crankshaft Stirling engine as shown in FIG. 1, pressure fluctuations generated within the cylinder 20 (pressure generation mechanism is omitted) act on the power piston 18 This is converted into force and the power piston rod 22. cross head 21
．． The power is transmitted to the connecting rod 11.12 for the piston. 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
It is connected to the crankshaft 7 by connecting rods 11 and 12 for power pistons, thereby transmitting power. 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 formed in the center of the power piston 18, and a displacer piston rod 17 is inserted into the hole. This is connected to the displacer piston 19 through the thread.

As described above, the Stirling engine with the conventional structure as shown in FIG. 1 has two power piston connecting rods 11.12 for transmitting power. It is necessary to match the spacing between the large end axis and the small end axis with a precision comparable to that of the bearing gap, which poses problems in terms of processing, cost, and ease of assembly. Furthermore, if there is poor accuracy in the lengths of the two connecting rods 11 and 12, the load will act on only one of the connecting rods, resulting in a decrease in operational reliability.

Furthermore, since the structure is such that the displacer piston 19 is assembled by drilling a hole in the center of the power piston 1B 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 the above points, and includes a mechanism for generating pressure acting on a power piston, an auxiliary cylinder, a rolling piston that rotates eccentrically within the auxiliary cylinder, and a rolling piston that rotates eccentrically within the auxiliary cylinder. The vane structure divides the interior into a low-temperature space and a high-temperature space, and by applying the pressure fluctuations generated in this auxiliary cylinder to the power piston, it is possible to simplify assembly, improve operational reliability, and reduce vibration. The aim is to provide a Stirling engine with a completely new structure.

[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. In the figure, 31 is a cylindrical auxiliary cylinder, and 32 is a crankshaft whose rotation center is at the center of this cylinder 31. , one part thereof is a crankshaft rolling cylinder that is eccentric to the crankshaft, and a rolling piston 3 that eccentrically rotates inside the auxiliary cylinder 31 by the eccentric portion 32a and the rolling cylinder 33.
4 are configured. 35 and 36 are vane grooves machined in the radial direction in a part of the auxiliary cylinder 31, into which vanes 37 and 38 are respectively inserted so as to be able to reciprocate and slide. Spring 39.
40 and is pressed against the outer peripheral surface of the rolling piston 34. Reference numerals 41, 42, 43, and 44 are gas passages formed in the auxiliary cylinder 31 to allow gas inside the auxiliary cylinder 31 to flow. 51 is the gas passage 41,4
3 and 52 are gas pipes communicating with the gas passages 42 and 44, and these gas pipes 51 and 52 are equipped with heaters 45 and 52.
A heat exchanger consisting of 46, a cooler 47, 48 and a regenerator 49,50 is arranged.

53 is a gas passage processed into the auxiliary cylinder 31, 55 is the main cylinder of the reciprocating engine section, 56 is a power piston, 57
is a connecting rod for power piston. A gas pipe 54 connects a space 62 formed by the main cylinder 55 and the power piston 56 to the gas passage 53 of the auxiliary cylinder 31. 59 is an auxiliary cylinder 31. A high-temperature space is formed by a rolling piston 34° and vanes 37 and 38, and 60 is a low-temperature space. Note that 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. Third
In the figure, 0 is the center of the crankshaft 32, and P is the center of the crankshaft eccentric portion 32a. Further, θ is the rotation angle of the crankshaft.

FIG. 5 is a sectional view of the structure of the embodiment shown in the schematic diagram of FIG. 49
,50. and coolers 47 and 48 are omitted for simplicity of explanation. In the figure, 71 is a crankcase, 72
．． Reference numeral 73 denotes a crankcase cylindrical portion, 75 and 76 a bearing fixed to the crankcase cylindrical portion 72 and 73 to rotatably hold the crankshaft 32, and 77 a mechanical bearing for sealing gas inside the crankcase and cylinder. It's a sticker. 7
8.79 are end plates fixed to both ends of the auxiliary cylinder 31, and the auxiliary cylinder 31, vanes 37, 38, rolling piston 34, etc. create a high temperature space 59 and a low temperature space 6.
0 is formed. 80 is a bearing fixed to the end plate 79;
81 is a flange, and the end plate 78 is fixed to the crankcase cylinder portion 73. Note that the vanes 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.

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 and a low-temperature space are separated by vanes 37 and 38. The volume of the 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.

1 The high temperature space 59 and the low temperature space 60 are connected to the heater 4
5.46, a regenerator 49.50, and a cooler 47.48, which are connected by gas pipes 51.52 and ventilated, so that the rotation of the crankshaft 32 creates a low-temperature space 60. High temperature space 59
As the volume increases or decreases, gas flows back and forth from the high-temperature space 59 to the low-temperature space 60 or 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 shown in FIGS. 3 and 4, as the rotation angle θ of the crankshaft 32 changes, the auxiliary cylinder 3
1, that is, the pressure in the power piston space 62 changes as shown in FIG. 4, for example. 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 generation mechanism is changed from the conventional reciprocating piston type to the rolling piston type, so 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.

In addition, since the connecting rod for the power piston can be configured with one piece, there is no need to make two connecting rods with high precision as in the past, making the assembly of the structure extremely simple, improving reliability and manufacturing costs. can also be reduced.

Note that in the above embodiment, the two vanes are provided at opposite positions (180" interval), but this does not necessarily have to be provided at opposite positions, as shown in FIG.
Even if the position of the vane 38 is shifted to reduce the volume of the high temperature space 59 by changing the position of the vane groove formed in the cylinder 63, the same operation and effect as in the above embodiment can be obtained.

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 vane 38 is set so that the high temperature space 59 becomes large, the output can be increased by 3.

〔Effect of the invention〕

As described above, according to the present invention, the pressure generation mechanism includes an auxiliary cylinder, a rolling piston that rotates eccentrically inside the auxiliary cylinder, and two plates that, together with the rolling piston, divide the inside of the auxiliary cylinder into low-temperature and high-temperature spaces. It was constructed of a rolling piston type with vanes, so it was processed.

This has the effect of providing a Stirling engine that is easy to assemble and has low manufacturing costs, and also has small reciprocating inertia, resulting in low vibration, low noise, and quiet operation.

[Brief explanation of the drawing]

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. be. 31... Auxiliary cylinder, 32.58... Crankshaft (rotating shaft), 32a... Crankshaft eccentric part, 33...
・Rolling cylinder, 34... Rolling piston, 35.36... Vane groove, 37.38... Vane, 39.40... Spring, 45.46... Heater, 49.50...・Regenerator, 47.48... Cooler, 51, 52... Gas piping (first passage), 54...
・Gas piping (second passage), 55...Main cylinder, 5
9...High temperature space, 60...Low temperature space, 62...Inner space of main cylinder. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent: Ken Hayase, Patent Attorney - 5 Figure 1 Figure 3 Figure 5

Claims (1)

[Scope of Claims] fil An auxiliary cylinder in which a rotating shaft that rotates in the same manner as the crankshaft is disposed, and a rolling piston that is attached to the rotating shaft so as to eccentrically rotate inside the cylinder as the shaft rotates. and two vanes provided so as to divide the internal space of the auxiliary cylinder into a low-temperature space and a high-temperature space by sliding in the radial direction of the cylinder while the tips of the vanes contact the outer peripheral surface of the rolling piston; a first passage communicating the low temperature and high temperature spaces;
A Stirling engine, comprising: a heat exchanger provided in the passage; and a second passage communicating the low-temperature space of the auxiliary cylinder with the internal space of the main cylinder. (2) The Stirling engine according to claim 1, wherein the rotating shaft disposed in the auxiliary cylinder is a crankshaft. (3) The auxiliary cylinder is formed into a cylindrical shape,
3. The Stirling engine according to claim 1, wherein the rotating shaft is located at the center of the auxiliary cylinder. (4) The rolling piston is characterized by 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) The vane is slidably disposed in two grooves formed in a part of the auxiliary cylinder in the radial direction. Sterling institution listed in any. (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.