JPS6262275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single cylinder drive type gas refrigerator.

Conventional gas refrigerators of this type include, for example, refrigerators based on the reverse Stirling cycle, and refrigerators based on the Gifford and McMuffon cycles. Since a phase difference of 90 degrees is required, it is necessary to perform each drive separately, which has the disadvantage of complicating the mechanism. Furthermore, in the latter case, although the operation is not synchronized with the stroke of the refrigeration cycle, a special gas compressor is required, and the refrigeration system as a whole tends to be heavy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a single cylinder drive type gas refrigerator which eliminates the above-mentioned problems all at once.

An embodiment of the present invention will be described below based on the accompanying drawings. The gas circuit 1 is configured as follows. That is, the compression space 4 formed by the compressor piston 2 and the compression cylinder 3, each having the displacer piston 2' disposed concentrically, is connected to the compressor space 4 through the cooler 5 and the directional timing valve 6.
The regenerator 7 leads to an expansion space 10 surrounded by the displacer piston 2' and a displacer cylinder 3' projecting in a concentric arrangement on the compression cylinder 3. On the other hand, a buffer space 11 is formed surrounding the rod 12 in a direction opposite to the compression space 4 through the compressor piston 2, and the buffer space 11 is connected through the directional timing valve 6 through a conduit 13. , from the regenerator 7 to the expansion space 10 . A one-way valve 14 is installed in the compressor piston 2, and is configured to conduct only from the buffer space 11 to the compression space 4. A seal 20 for gas sealing is provided on a portion of the outer periphery of the displacer piston 2', and a seal 30 for gas sealing is provided on a portion of the outer periphery of the compressor piston 2. Furthermore, a seal 40 for gas sealing is also provided on a part of the outer wall of the rod 12.
The rods 12 and 12 are installed respectively.
is connected to a reciprocating drive mechanism (for example, a hydraulic drive, etc.), which is not shown.

In the above configuration, when the rod 12 is driven by a reciprocating drive mechanism (not shown) and the compressor piston 2 moves to the top dead center, the gas (for example, He gas) in the compression space 4 is compressed. The heat generated at this time is removed by the cooler 5. When the compressor piston 2 reaches near the top dead center, the direction switching timing valve 6 (in Fig. 2) conducts in the direction of the compression space 4 - cooler 5 - regenerator 7 - expansion space 10. When the compressor piston 2 begins to descend, the displacer piston 2' also descends, and the gas begins to expand within the expansion space 10, the direction switching timing valve 6 closes (see FIG. 2). . Further, the compressor piston 2 is lowered (as shown in FIG. 2), and at this time, at the same time as the gas in the expansion space 10 is expanded, the gas in the buffer space 11 is transferred from the one-way valve 14 to the compression space. 4, and this inflow continues until the compressor piston 2 reaches the bottom dead center. When the compressor piston 2 reaches the bottom dead center (in Fig. 2), the direction switching timing valve 6
conducts in the direction of expansion space 10 - regenerator 7 - conduit 13 - buffer space 11, and as the compressor piston 2 moves to the top dead center, the gas in the expansion space 10 changes from the previous time. It passes through the regenerator 7 and moves from the conduit 13 to the buffer space 11, but during this process (in Fig. 2,...) the compression space 4
Inside, the gas is compressed. When the compressor piston 2 reaches near the top dead center again, the direction switching timing valve 6 closes the direction of the expansion space 10 - regenerator 7 - conduit 13 - buffer space 11, and again the direction of the compression space 4 - cooler 5 - Electricity is established in the direction of the regenerator 7 and the expansion space 10 (FIG. 2, bottom), completing one cycle. P _E in the expansion space 10 during the above-mentioned cycle
FIG. 3 shows a P _E -V _E diagram plotting the relationship between (pressure) and V _E (volume) in correspondence with the numbers given in FIG. 2, and this is clearly a refrigeration cycle.

As described above, according to the present invention, since the displacements of the displacer piston and the compressor piston may be the same, it is possible to have a structure in which they are connected concentrically, and a special gas compressor is not required. Furthermore, the one-way valve that allows flow only from the buffer space to the compression space is integrally provided with the compressor piston, making it possible to have a very simple and compact single-cylinder arrangement.

[Brief explanation of the drawing]

All of the figures show an embodiment of the single-cylinder drive type gas refrigerator of the present invention. Fig. 1 is a circuit diagram, Fig. 2 is an explanatory diagram showing the operating state divided into 10 strokes, and Fig. 3 is an explanatory diagram showing the operating state divided into 10 strokes. is the gas pressure in the expansion space-volume P _E
-V _E diagram. 1: Gas circuit, 4: Compression space, 5: Cooler,
6: Direction switching timing, 7: Regenerator, 10: Expansion space, 11: Buffer space, 13: Conduit, 1
4: One-way valve.

Claims (1)

[Claims] 1. A compression cylinder, a compressor piston fitted in the compression cylinder and defining a compression space and a buffer space on the upper and lower sides, respectively, and a compressor piston provided on the compressor piston to direct the flow from the buffer space toward the compression space. One-way valve, which allows
a displacer cylinder concentrically protruding from above the compression cylinder; a displacer fitted within the displacer cylinder to define an expansion space and concentrically and integrally connected to the compressor piston; a supiston, a regenerator and a cooler interposed between the expansion space and the compression space;
and a direction switching timing valve disposed both between the regenerator and the cooler and between the regenerator buffer space, and when the compressor piston reaches near top dead center, the The directional switching timing valve allows communication between the cooler and the regenerator and blocks communication between the regenerator and the buffer space, so that the compressor piston moves from near top dead center to bottom dead center. During the transition, the directional timing valve blocks both communication between the cooler and the regenerator and between the regenerator and the buffer space, so that the compressor piston is at bottom dead center. When it is nearby,
The directional switching timing valve is configured to allow communication between the regenerator and the buffer space and to cut off communication between the cooler and the regenerator. .