JPS6353466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a Stirling refrigerator, and more particularly to a compact drive device for a Stirling refrigerator.

Refrigerators using the Stirling cycle are expected to be put into practical use due to their high efficiency, but the Rhombik drive mechanism, which drives the compression piston and expansion piston with a fixed phase difference, uses an integrated crank. The axial length is increased by the length of the bent portion, which has the disadvantage that the dimensions of the drive device become larger.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact drive device for a Stirling refrigerator that eliminates the above-mentioned drawbacks. A drive device for driving a Stirling refrigerator, which basically consists of an expansion chamber with an expansion piston to expand, a compression piston, and a drive device for driving the expansion piston, is a planetary reducer with a ring gear fixed to a housing. It has a planetary reduction mechanism in which an input rotating shaft is connected to the sun gear, a crank pin eccentric with respect to the axis is fixed to the carrier crank of the planetary gear, and a first eccentric ring is supported on the crank pin. A circular eccentric cam having a second eccentric ring supported on the outer periphery is fixedly provided, and the first
There is provided a driving device for a Stirling refrigerator, characterized in that the compression piston and the expansion piston are driven through connecting rods connected to the second eccentric and the second eccentric, respectively.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Figure 1, the vertically protruding parts are:
This is a Stirling cycle refrigerator 10 for generating low temperature by being driven by a drive device 50 according to the present invention. The basic principle of this refrigerator 10 is well known and consists of a compression piston 12 that reciprocates within a compression cylinder 11 and an expansion piston 14 that reciprocates within an expansion cylinder 13. The expansion piston 14 is reciprocated by the device 50, with the expansion piston 14 advancing 90 degrees in phase with respect to the compression piston 12. The compression piston 12 rises from the position shown in FIG. Send gas to space 18. The thermal energy generated in this compression process is transferred from conduit 16 to the water in radiator 19. Next, the expansion piston 14 moves downward, so that the gas expands and a low temperature is generated in the regenerator 17. The expansion piston 14 then moves upwardly, returning the gas in the expansion space 18 to the compression space 15. By repeating the above steps, the temperature inside the regenerator 17 gradually decreases.

Next, the drive device 50 will be explained. The drive device 50 is perpendicular to the refrigerator 10, and has an L-shaped structure as a whole. The drive device 50 mainly includes a prime mover 60, a planetary reducer 70 connected to the prime mover 60, a carrier crank 80 fixed to a planetary gear 71 of the planetary reducer 70, and a crank pin 83 of the carrier crank 80. Connecting rods 90 and 9 that are attached to and reciprocate the pistons 12 and 14 of the refrigerator 10
5, and a housing 110 that seals and accommodates the above components. The prime mover 60 located at the left end of the drive device is preferably an electric motor, such as a DC motor, an AC synchronous motor, an AC induction motor, an AC commutator motor, or an AC/DC dual-purpose motor. A rotary output shaft 62 that supports a rotor 61 of this motor 60 is rotatably supported by bearings 63 on the left and right sides, and its right end is spline-coupled to a sun gear 72 of a planetary reducer 70 as shown in FIG. .

The planetary reducer 70 has a sun gear 72 rotated by an output shaft 62, a ring gear 74 fixed to the housing 110 by a bolt 73, and is meshed between these gears 72 and 74, and is connected to a crank carrier 80 by a pin 75. It consists of three planetary gears 71 that are rotatably connected. Planetary reducer 7
0 and the crank carrier 80 together constitute a reduction mechanism, and transmit the rotational movement of the output shaft 62, that is, the sun gear 72, to the carrier crank 80 at a constant reduction ratio and in the same direction.

The carrier crank 80 is composed of a disk-shaped portion 82 to which the planetary gear 71 is attached, and a crank pin 83 that protrudes from the disk-shaped portion 82 and has an eccentric axis Y eccentric from the rotation axis X. As shown in FIGS. 1 and 4, the outer periphery of the carrier crank 80 is supported by a ball bearing 84. As shown in FIGS. By providing such a bearing, it is possible to obtain the effect that the rotation of the carrier 80 is stabilized.
A crank 85 is fixed to the right end of the crank pin 83 by a bolt 86, and supports the right end of the crank pin 83 so as to be rotatable.

Eccentric wheels (first eccentric wheels) 91 of a pair of connecting rods 90 are pivotally connected to both sides of the crank pin, and the other ends of these connecting rods 90 are connected to the compression piston 12 of the Stirling refrigerator 10 via pins 92. It is pivoted to. With such a mechanism, the crank pin 83
When the piston rotates around the rotation axis X, the compression piston 1
2 reciprocates within the compression cylinder 11. A circular eccentric cam 96 is fixed by a key 97 between the eccentric wheels 91 of these connecting rods 90 . As shown in FIG. 5, the center Z of the eccentric cam 96 is eccentric by a predetermined amount with respect to the rotation axis X of the carrier crank 80, so that the phase of the reciprocating movement of the expansion piston 14 is approximately 90 degrees from the phase of the compression piston 12. It's starting to move forward. A second eccentric ring 99 of the connecting rod 95 is fitted onto the outer periphery of the eccentric cam 96 via a ball bearing 98, and the other end of the connecting rod 95 forms a spherical journal 100. This spherical journal 100 is held in a pair of spherical bearings 103 which are screwed into female threads 102 at the end of a rod 101 which passes through the compression piston 12 and is connected to the expansion piston 14. Eccentric wheel 99 and connecting rod 95
converts the rotational motion of the crank pin 83 into a reciprocating motion of the expansion piston 14, and the reciprocating motion is
Because of the eccentric cam 96 than the compression piston 12
The phase advances by 90 degrees, providing the piston stroke necessary for Stirling cycle refrigeration work.
In this embodiment, both pistons are located in the same direction, but they may also be located opposite each other with the rotation axis X as the center.

A housing 110 that seals and accommodates the drive device 50 is a housing 1 that accommodates the prime mover 60.
10a, an intermediate housing 110b that accommodates the planetary reducer, a side plate 110c that supports the crank 85, and a bottom plate 110d located below the crank pin 83, which are integrally connected to each other by an O-ring 115 and a bolt 116. In addition, the intermediate housing 110b is the housing of the refrigerator part, that is, the compression cylinder 1.
1 are joined in a sealed state by an O-ring 117 and a bolt 118. Therefore, the drive device 50
The housing 110 of the refrigerator 10 provides a sealed space for the working gas in the refrigerator 10 together with the housing 11 of the refrigerator 10.
10 is not penetrated by the rotating shaft, so the sealing performance is further improved.

The configuration of the present invention is as described above, and by employing the planetary reducer 70 and the carrier crank 80, the overall length of the device is shortened, and the carrier crank 80 and the eccentric cam 96 provide a freewheel effect, so the freewheel No installation required. Furthermore, as mentioned above, since the entire drive mechanism is housed within the housing, the sealing performance against the working gas is improved. By employing a planetary speed reducer, the speed reduction mechanism itself can be built into the device, making it more compact and ensuring smooth operation.

In the above embodiment, the compression chamber and the compression piston, the expansion chamber and the expansion piston, and their arrangement were as shown in the drawings, but the present invention is not necessarily limited to this arrangement and format. By using this planetary reduction mechanism as a drive mechanism, it is possible to take various aspects in other detailed designs.

For example, the roles of the first eccentric wheel 91 and the second eccentric wheel (or eccentric cam) can be reversed from those shown in the drawings. Further, the axial arrangement of the first eccentric ring and the eccentric cam can also be changed as necessary. As already mentioned, the compression piston and the expansion piston can be arranged at opposite positions or at different angular positions with respect to the rotation axis X. The design of the articulating rod is made on a case-by-case basis.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a Stirling refrigerator drive device according to the present invention, and FIG.
A schematic diagram showing the gear train of the drive device shown in the figure, FIG. 3 is A-A in FIG.
4 is a sectional view taken along the line B-B of FIG. 1 showing the installation of the connecting rod that drives the compression piston, and FIG. 5 is a sectional view showing the installation of the connecting rod that drives the expansion piston. FIG. 2 is a sectional view taken along line CC in FIG. 1; 10... Refrigerator, 50... Drive device, 60...
Prime mover, 70...planetary reducer, 80...carrier crank, 90, 95...connecting rod, 110...housing.

Claims (1)

[Claims] 1. Basically, a compression chamber equipped with a refrigerant compression piston, an expansion chamber equipped with an expansion piston that expands the refrigerant compressed in the compression chamber, and a drive device for driving the compression piston and the expansion piston. In a drive device for driving a Stirling refrigerator consisting of,
It has a planetary reduction mechanism in which an input rotating shaft is connected to the sun gear of a planetary reduction gear having a ring gear fixed to a housing, and a crank pin eccentric with respect to the axis is fixed to the carrier crank of the planetary gear.
A circular eccentric cam having a first eccentric wheel bearing on the crank pin and a second eccentric wheel bearing on the outer periphery is fixedly provided, and the circular eccentric cam is connected to the first eccentric wheel and the second eccentric wheel through connecting rods connected to the first eccentric wheel and the second eccentric wheel, respectively. A driving device for a Stirling refrigerator, characterized in that the compression piston and the expansion piston are driven by the compression piston and the expansion piston. 2. Drives a Stirling refrigerator, which basically consists of a compression chamber equipped with a refrigerant compression piston, an expansion chamber equipped with an expansion piston that expands the refrigerant compressed in the compression chamber, and a drive device for driving the compression piston and the expansion piston. In a drive device for
An input rotary shaft is connected to the sun gear of a planetary reducer with a ring gear fixed to a housing, a crank pin eccentric to the shaft is fixed to the carrier crank of the planetary gear, and the outer periphery of the carrier crank is bearinged in the housing. a planetary reduction mechanism consisting of a circular eccentric cam having a first eccentric ring on the crank pin and a second eccentric ring on the outer periphery; A driving device for a Stirling refrigerator, characterized in that the compression piston and the expansion piston are driven through connecting rods connected to rings, respectively.