JPS6353467B2 - - 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 highly efficient and are desired to be put into practical use.They include 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 compression piston. and a drive device for driving the expansion piston.

In some known Stirling refrigerators of the above type, the Rhombik drive mechanism that reciprocates the compression piston and expansion piston with a constant phase difference is composed of an integral crank, but in this case,
The disadvantage was that the axial length was increased by the length of the bent portion (crank pin) of the crank, and as a result, the dimensions of the drive device were increased. In addition, some refrigerators are driven by a prime mover outside the drive mechanism, such as a motor, via a speed reducer, but in this case, there is a drawback in that it is difficult to gas-seal the bearing portion of the connecting shaft that passes through the housing. moreover,
It is also known that a compression piston and an expansion piston are arranged coaxially on the left and right sides of a motor in the casing, but in this case, two deceleration drive mechanisms are required on the left and right, and the length of the device in the axial direction is extremely large. It had the disadvantage of being long.

An object of the present invention is to provide a driving device for a Stirling refrigerator that eliminates the above-mentioned drawbacks.

That is, in the Stirling refrigerator of the above type, the present invention connects an input rotating shaft connected to the output of the prime mover to the sun gear of a planetary reducer in which a ring gear is fixed to the housing as the drive device. A circular eccentric cam having a planetary reduction mechanism in which a crank pin eccentric with respect to the shaft is fixed to a carrier crank, a first eccentric ring is supported on the crank pin, and a second eccentric ring is supported on the outer periphery. fixedly having said first and second
a drive device for driving the compression piston and the expansion piston through connecting rods respectively connected to eccentric wheels of the Stirling refrigerator, and the entire drive device including the prime mover is sealed in a housing integral with the housing of the Stirling refrigerator. The above-mentioned problem is solved by accommodating the container as a container.

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. This refrigerator 10 itself 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. These pistons 12 and 14 are connected to a drive device 50. It moves back and forth,
At this time, the expansion piston 14 is
The phase of is advanced by 90°. 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. This drive device 50 mainly includes a prime mover 60, a planetary reducer 70 connected to this prime mover 60, a carrier crank 80 fixed to a planetary gear 71 of this planetary reducer 70, and a crank pin 83 of this carrier crank 80. Connecting rods 90, 9 are attached to the refrigerating machine 10 and reciprocate the pistons 12, 14
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 motor. A rotary output shaft 62 supporting the rotor 61 of this motor 60 has bearings 63 on the left and right sides.
The right end thereof 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 a ring gear 74 that is meshed between these gears 72 and 74. The planetary reducer 70 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 has the above configuration, so the output shaft 62
That is, the rotational motion of the sun gear 72 is transmitted to the carrier crank 80 in the same direction at a constant reduction ratio.

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 carrier crank 80
The outer periphery of is supported by a ball bearing 84. Although it is possible to omit the bearing 84, by providing such a bearing, the rotation of the carrier 80 is stabilized. At the right end of the crank pin 83 is a crank 85.
is fixed by bolt 86, and crank pin 83
The right end is supported so that it can rotate freely.

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 . The center Z of this eccentric cam 96 is eccentric by a predetermined amount with respect to the rotation axis X of the carrier crank 80, as shown in FIG. It's becoming like that. An eccentric ring (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 is
It has a spherical journal of 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 convert rotational movement of crank pin 83 into reciprocating movement of expansion piston 14, which reciprocating movement is caused by eccentric cam 96
The phase is advanced by 90 degrees, providing the piston stroke necessary for Stirling cycle refrigeration work.

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.
Since the rotary shaft does not pass through 10, 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. has become unnecessary. Furthermore, as described above, since the entire drive mechanism is housed within the housing, the sealing performance against the working gas is improved without using a special sealing device.

As described above, in the present invention, the compression piston and the expansion piston can be driven by one small reduction drive mechanism, and both pistons are crank driven in the direction perpendicular to the rotation axis, so smooth operation is achieved without strain. be done.

[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 of FIG. 1 showing the arrangement of gears of the planetary reducer.
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. A Stirling refrigerator basically consisting 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, As the drive device, an input rotating shaft connected to the output of the prime mover is connected to the sun gear of a planetary reducer with a ring gear fixed to the housing, and a crank pin eccentric to the axis is fixed to the carrier crank of the planetary gear. a planetary speed reduction mechanism, which has a circular eccentric cam fixed on its outer periphery bearing a first eccentric ring on the crank pin and a second eccentric ring on its outer periphery;
and a drive device for driving the compression piston and the expansion piston through connecting rods respectively connected to second eccentric wheels, and the entire drive device including the prime mover is mounted in a housing integral with the housing of the Stirling refrigerator. A Stirling refrigerator characterized by being hermetically housed inside.