JPH08320166A - Sealing mechanism of gas compressor/expander - Google Patents

Abstract

PURPOSE: To provide a gas compressor/expander which prevents lubricating oil and metal powder entering a guide space from adhering to a piston rod, and further prevents the lubricating oil and/or metal powder from entering a back pressure space. CONSTITUTION: There is disposed a cylindrical suction/discharge member which abuts and surrounds a piston rod 23 in a guide space 4 formed in a cross guide 43 to discharge lubricating oil as it is compressed and suck lubricating oil as it returns to an original shape. There is further disposed check valves 27b, 4b across at least two of a hole 27a, a hole 25a, and a hole 4a formed in a wall surface of the guide space 4 for allowing only a gas flow flowing from a piston driving chamber 11 through an internal peripheral space 42, the hole 25a, an external peripheral space 41, and the hole 4a into the piston driving chamber 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compression expander for a refrigerating device which generates a low temperature by sliding a piston and / or a displacer, and particularly prevents the adhesion of lubricating oil, metal powder, etc. to a piston rod. , A sealing mechanism for preventing lubricating oil, metal powder, etc. from entering the piston working chamber.

[0002]

2. Description of the Related Art In the electronic device field, biotechnology field, etc., development of a refrigeration technique for cooling and storing various samples, materials, infrared sensors, superconducting devices, etc. at ultralow temperatures is desired. As a refrigerating device that generates an ultralow temperature, a device that compresses or expands a refrigerant gas by a gas compression expander is known, and examples thereof include a Stirling refrigerator, a pulse tube refrigerator, and a GM cycle refrigerator. A refrigeration system equipped with these gas compression expanders can realize ultra-low temperature with excellent efficiency.

A Stirling refrigerator will be described below as an example. FIG. 8 shows a known 2-piston Stirling refrigerator (1), which is a casing (1) filled with a refrigerant gas.
A piston drive chamber (11) is formed in (0), and a compression side piston working chamber (2) acting as a gas compressor and an expansion side piston working chamber (3) acting as a gas expander are formed in the piston driving chamber.
Deployed by connecting to (11). Compression side piston working chamber
The (2) and the expansion-side piston working chamber (3) are arranged so as to be shifted by about 90 ° with respect to the crankshaft (12), and the crankshaft (12) rotates counterclockwise to cause the crankshaft (12) to rotate. Two pistons (22) and (32) connected via the connecting rods (24) and (34) and the piston rods (23) and (33) slide with a phase difference of 90 °. By sliding the pistons (22) and (32), a space consisting of the compression chamber (20), the expansion chamber (30), the gas flow pipe (13), and the regenerative heat exchanger (14) (hereinafter referred to as "surface pressure space (16 ) '') Refrigerant gas such as helium gas filled inside the compression chamber (20) and expansion chamber
By repeating compression, expansion, and movement at (30), the compression chamber
The gas flow pipe (13) connecting the expansion chamber (30) and the expansion chamber (30) and the regenerative heat exchanger (14) composed of metal meshes are passed through and moved to the expansion chamber (30) at ultra-low temperature. To generate high temperature in the compression chamber (20). The ultra-low temperature freezing generated in the expansion chamber (30) cools the sensors and the like.

The compression side piston working chamber (2) will be described. The piston working chamber (2) on the compression side includes a piston working chamber (2) filled with a refrigerant gas and a piston (22) slidably fitted in the piston working chamber (2). (2
The piston working chamber (2) is partitioned into a surface pressure space (16) and a back pressure space (21) by a piston ring (22a) fitted in 2), and the surface pressure space (16) is the gas flow pipe ( 13).
The piston drive chamber (11) is similarly filled with a refrigerant gas and is rotated by the drive of a power source (not shown).
Will be deployed. To make the crankshaft (12) rotate smoothly, the bottom of the piston drive chamber (11) has a lubricating oil (15)
The crankshaft (12) is filled with oil by an oil splasher (not shown) installed on the crankshaft (12).
Lubricating oil (15) is splashing on. The piston (22)
It is connected to the crankshaft (12) via a piston rod (23) and a connecting rod (24). The back pressure space (21) and the piston drive chamber (11) are partitioned by an oil seal (26) having a through hole (26a) through which the piston rod (23) reciprocates. The back pressure space (21) is the expansion side piston working chamber.
It is an airtight space that is connected to the back pressure space (31) of (3) by a gas flow path (not shown), and becomes a power loss by being compressed or expanded when the crank mechanism is driven. The expansion chamber (30) It does not contribute to the generation of cryogenic temperatures in.

The rotation of the crankshaft (12) causes the piston
When (22) rises and moves in a direction that reduces the volume of the surface pressure space (16), the refrigerant gas in the surface pressure space (16) is compressed and flows out into the gas flow pipe (13), and the surface pressure is also reduced. When the piston (22) moves in the direction of expanding the volume of the space (16), the gas flow pipe (13)
The refrigerant gas flows into the surface pressure space (16) from the inside. The expansion side piston working chamber (3) has the same structure.

[0006]

The atomized lubricating oil is mixed with the refrigerant gas inside the piston drive chamber (11). Refrigerant gas mixed with lubricating oil mist in the piston drive chamber (11) is back pressure space due to the differential pressure between the back pressure space (21) and the piston drive chamber (11) due to the sliding of the piston (22).
Lubricating oil, which adheres to the piston rod (23) in a film shape, may flow into the back pressure space (21) due to the inflow into the (21) or the reciprocating movement of the piston rod (23). Back pressure space (21)
The piston drive chamber (11) and the oil seal (2
Although it is partitioned by 6), it was difficult to prevent the lubricating oil from entering the back pressure space (21) only by the oil seal (26). The lubricating oil adhering to the piston rod (23) may be mixed with metal powder or the like due to wear of the crank mechanism. Metal powder adheres to the sliding part between the oil seal (26) and the piston rod (23), and the back pressure space (21)
If it penetrates into, the sealing effect may be weakened and the piston (22) may be worn.

Further, the lubricating oil that has entered the back pressure space (21) is partitioned by the piston ring (22a) into the front pressure space (1
If it leaks to 6), the lubricating oil flowing into the surface pressure space (16) reaches the regenerative heat exchanger (14) through the gas flow pipe (13),
It adheres to the metal mesh of the regenerative heat exchanger (14), causing clogging and a decrease in the heat exchange rate.
May deteriorate the cold storage capacity of. Regenerative Heat Exchanger (14)
The deterioration of the cold storage capacity of the above means the deterioration of the refrigeration capacity of the refrigeration system. To avoid these problems, lubrication oil piston drive chamber (11) to back pressure space (21)
It is extremely important to prevent outflow to (2).

An object of the present invention is to prevent the lubricating oil and metal powder that enter the guide space from adhering to the piston rod,
Provided is a gas compression expander that prevents lubricating oil and / or metal powder from entering the piston working chamber.

[0009]

In order to solve the above-mentioned problems, in the sealing mechanism of the gas compression expander of the present invention,
On the piston drive chamber (11) side of the partition plate (25), a cylindrical cross guide (43) is provided surrounding the piston rod (23), and the piston rod (23) has a cross guide (43). A piston guide (27) that reciprocates in the guide space (4) formed inside is attached. The piston guide (27) has a piston drive chamber.
A hole (27a) having a check valve (27b) that allows only gas flow from the (11) to the guide space (4) is opened to penetrate the guide space.
(4) communicates with the piston drive chamber (11). Cross guide (4
A hole (4a) having a check valve (4b) for allowing only gas to flow from the guide space (4) to the piston drive chamber (11) is penetratingly formed in 3). Piston rod in the guide space (4)
A cylindrical suction member (6) that abuts and surrounds (23) is provided, and a partition plate (25) and a piston guide (27) are provided inside the cross guide (43).
An annular expansion and contraction body (5) whose ends are engaged with and is arranged so as to surround the hole (27a) formed in the piston guide (27), and the guide space (4) is surrounded by the outer peripheral space (41). And the inner space (42). The partition plate (25) has an inner space (42) and an outer space (41).
A hole (25a) communicating with and is opened.

[0010]

[Operation] The piston rod (23) reciprocates by the rotation of the crankshaft (12). When the piston rod (23) located near the top dead center moves toward the crankshaft (12) (Fig. 2), the volume of the guide space (4) expands and becomes larger than the piston drive chamber (11). Also becomes low pressure, the check valve (27b) of the hole (27a)
Is opened, and gas flows from the piston drive chamber (11) into the guide space (4). The gas flowing into the guide space (4) contains a mixture of mist-like lubricating oil and metal powder in the piston drive chamber (11), but the piston rod (23) moves to the crankshaft (12).
By moving in the direction, the partition plate
The suction member (6), which was compressed by being sandwiched between the (25) and the piston guide (27), returns to its original shape, and the suction member (6) collects the lubricating oil and the metal powder mixed in the gas. Absorb a part.

Next, when the piston rod (23) located near the bottom dead center moves in the direction away from the crankshaft (FIG. 3), the volume of the guide space (4) is reduced and the piston drive chamber ( The pressure becomes higher than that of 11), the check valve (27b) of the hole (27a) is closed, and the check valve (4b) of the hole (4a) is opened. Check valve (4
By opening b), the gas in the outer peripheral space (41) is discharged to the piston drive chamber (11), and the gas in the inner peripheral space (42) is released into the holes (2
5a) flows into the outer peripheral space (41), and the piston drive chamber (1
It is discharged to 1). At this time, the suction member (6) sucking the lubricating oil and the metal powder in the step shown in FIG.
It is sandwiched between the piston guide (27) and compressed, and the lubricating oil and metal powder are discharged. Lubricating oil, etc., discharged should
It is sucked out from (25a) and discharged into the piston drive chamber (11) through the outer peripheral space (41).

[0012]

[Effects of the Invention] The reciprocating movement of the piston rod (23) causes the suction member (6) to be compressed or returned to its original shape, and the lubricating oil and the metal powder contained in the gas in the guide space (4) are sucked to perform lubrication. It is possible to prevent oil and the like from adhering to the piston rod (23). As a result, inflow of lubricating oil or the like into the piston working chamber (2) can be prevented, and a reduction in refrigerating capacity can be prevented. In addition, a metal powder piston working chamber (2)
The wear of the piston (22) and the like due to the inflow of water is prevented.
The lubricating oil sucked by the suction member (6) is sucked out from the hole (25a) by the flow of the refrigerant gas due to the pressure difference between the guide space (4) and the piston drive chamber (11), and the outer circumference Since it flows out into the piston drive chamber (11) through the space (41), the lubricating oil, metal, etc. discharged from the suction member (6) do not operate in a state of adhering to the piston rod (23).
Further, the rod seal mechanism of the present invention is configured so that the reciprocating movement of the piston rod (23) by the rotation of the crankshaft (12) and the guide space
Since the differential pressure between (4) and the piston drive chamber (11) is used, no other drive source is required.

[0013]

Embodiments of the present invention will be described in detail with reference to the drawings.
In addition, although the following embodiment describes an example in which the present invention is applied to a two-piston type Stirling refrigerator driven by a crank mechanism, the present invention is not limited to this, and is, for example, a one-piston, one-displacer type. Can be applied to a gas compression and / or expansion device such as a Stirling refrigerator, a pulse tube refrigerator, a GM cycle refrigerator, etc., and an air compressor having one cylinder or a plurality of cylinders, and the piston drive mechanism is not limited to the crank mechanism. First, the basic configuration of the Stirling refrigerator (1) will be described with reference to FIG. Stirling refrigerator (1) is a closed casing
The inside of (10) is filled with a refrigerant gas such as helium and nitrogen, and a piston drive chamber (11) having a crank mechanism as a piston drive mechanism and a piston (22) (32) sliding by the crank mechanism are provided. Two piston working chambers (2)
(3) is formed. The piston working chambers (2) and (3) are arranged so as to be displaced by 90 ° with respect to the crankshaft (12) of the crank mechanism.

Piston drive chamber (11) and piston working chamber
(2) (3) is a partition plate (25) equipped with oil seals (26) (36)
Partitioned by (35). A crank mechanism including a crank shaft (12) and connecting rods (24) (34) connected to the crank shaft (12) is provided inside the piston drive chamber (11). A power source (not shown) such as an electric motor or an internal combustion engine is connected to one end of the crankshaft (12), and the crankshaft (12) is rotated by rotationally driving the power source. The other end of the crankshaft (12) is rotatably supported by the casing (10). The bottom of the piston drive chamber (11) is filled with lubricating oil (15), and the lubricating oil (15) is supplied by an oil splasher (not shown) provided on the crankshaft (12). It bounces on the crank mechanism and lubricates the rotary connection.

The two piston working chambers (2) and (3) are partitioned into two spaces by pistons (22) and (32), respectively. When the crankshaft (12) rotates counterclockwise, the piston working chamber on the piston (32) side that slides by advancing by 90 ° expands the piston working chamber (3) on the expansion side and expands the piston (32). Side piston (32), the other piston working chamber (2) is the compression side piston working chamber (2), and the fitted piston (22) is the compression side piston (2).
Call 2). The expansion side acts as a gas expander and the compression side acts as a gas compressor. Regarding the expansion side piston working chamber (3), the side closer to the piston drive chamber (11) is the expansion side back pressure space (31) and the far side is the expansion chamber (30), and the compression side piston working chamber (2) The side closer to the piston drive chamber (11) is the compression side back pressure space (21), and the one farther from the piston drive chamber (11) is the compression chamber (20). A piston rod (23) (33) is connected to each piston (22) (32). The piston rods (23) (33) are connected to the partition plates (25) (3
Through the through holes (26a) (36a) opened in the approximate center of 5),
It is connected to connecting rods (24) and (34), and the connecting rods (24) and (34) are connected to the crankshaft (12). On the outer surface of the piston (22) (32), the piston ring (2
2a) (32a) is fitted, compression chamber (20) and expansion chamber (30)
And the back pressure spaces (21) and (31) are sealed. Compression chamber
The (20) and the expansion chamber (30) are connected by a gas flow pipe (13), and in the flow path of the gas flow pipe (13), a regenerative heat exchanger (14) in which metal mesh is laminated is provided. It The space occupied by the compression chamber (20), the expansion chamber (30), the gas flow pipe (13) and the regenerative heat exchanger (14) is referred to as a surface pressure space (16).

In the Stirling refrigerator (1), the crankshaft (12) is rotated by the driving of the power source and the two pistons (2
2) The (32) slides with a phase difference of 90 °, and the refrigeration cycle consisting of the compression stroke, the equal volume transfer stroke, the expansion stroke and the equal volume transfer stroke is repeated in the surface pressure space (16), and the compression chamber ( The compression heat is released in 20), and an ultralow temperature is generated in the expansion chamber 30 due to the absorption of heat by the expansion of the refrigerant gas. The refrigerant gas, which has become extremely low temperature in the expansion chamber (30), cools the regenerative heat exchanger (14) when moving to the compression chamber (20) through the gas flow pipe (13). In addition, the refrigerant gas that has increased in temperature and moved in the compression chamber (20) radiates heat in the regenerative heat exchanger (14), is cooled, and flows into the expansion chamber (30).

An example in which the two-piston type Stirling refrigerator (1) is equipped with the seal mechanism of the present invention will be described. Figure 2
And FIG. 3 is an enlarged view of the peripheral part of the partition plate (25) between the compression side back pressure space (21) and the piston drive chamber (11) of the Stirling refrigerator (1) of FIG. A mechanism having a similar configuration is also provided on the expansion side. On the piston drive chamber (11) side of the partition plate (25),
A cylindrical cross guide (43) is provided to form a guide space (4) inside. A disc-shaped piston guide (27) is fixedly provided at the end of the piston rod (23) on the side of the connecting rod (24).
(24) is provided on the piston guide (27) so as to be swingable by a pin (28). The movement of the connecting rod (24) due to the rotation of the crankshaft (12) causes the piston guide (27) to reciprocate simultaneously with the piston (22). At this time, the outer peripheral surface of the piston guide (27) substantially abuts the inner peripheral surface of the cross guide (43), and is formed so as to slide while preventing leakage of the refrigerant gas as much as possible.

As shown in FIG. 4, the guide space (4) is provided with a telescopic body (5) formed of a flexible material into a cylindrical bellows. As shown in FIG. 2, the annular upper part of one end of the elastic body (5) is the partition plate (25), and the other annular lower part is the piston guide.
(27) are closely adhered and joined to each other over the entire circumference. The guide space (4) is divided into an outer peripheral space (41) and an inner peripheral space (42) by the expandable body (5).

Piston rod (23) inside the guide space (4)
Around the circumference of, a sponge, a fibrous member (such as cotton), a urethane resin, or the like is used to discharge the lubricating oil when compressed, and a cylindrical suction member (6 that absorbs the lubricating oil when returning to the original shape). ) Is arranged to abut and surround the piston rod (23). The length of the suction member (6) in the moving direction of the piston rod (23) is such that at least when the piston guide (27) is farthest from the crankshaft (12).
Any length may be used as long as it is compressed between the (27) and the partition plate (25).

As shown in FIGS. 2 and 3, the partition plate (25) is connected to the outer peripheral space (41) and the inner peripheral space (42) by one or two.
The above jet holes (25a) are opened. A part of the end opening on the inner peripheral space (42) side of each ejection hole (25a) opens toward the suction member (6) near the piston rod (23). Also, a partition plate
An oil seal (26) made of resin or the like is provided on the back pressure space (21) side of (25).

On the cross guide (43), one or more holes (4a) are formed near the joint with the partition plate (25), and the guide space ( A check valve (4b) which allows only the outflow of the refrigerant gas from the piston drive chamber (11) to the piston drive chamber (11) is provided.

The piston guide (27) has a piston drive chamber.
The hole (27a) that connects the (11) and the inner peripheral space (42) is 1 or 2
The piston drive chamber has been opened in each hole (27a).
A check valve (27b) is provided which allows only the inflow of the refrigerant gas from the (11) to the inner peripheral space (42).

[Seal Operation] The operation of the seal mechanism having the above structure will be described in detail with reference to FIGS. 2 and 3. [Step 1] As shown in FIG. 2, when the piston rod (23) located near the top dead center moves toward the crankshaft (12), the volume of the guide space (4) increases. Due to the expansion of the volume, the gas pressure in the guide space (4) is
It becomes lower than the gas pressure of (11), the check valve (27b) of the hole (27a) opens, and gas flows from the piston drive chamber (11) into the guide space (4). The gas flowing into the guide space (4) is mixed with mist-like lubricating oil and metal powder in the piston drive chamber (11). However, as the piston rod (23) moves in the direction of the crankshaft (12), the suction member (6) that is compressed by being sandwiched between the partition plate (25) and the piston guide (27) in step 2 described later. Is restored to its original shape, and the suction member
(6) Absorbs some of the lubricating oil and metal powder mixed in the gas. Further, the refrigerant gas flowing into the guide space (4) flows through the hole (27a) into the inner peripheral space (42), and a part of the refrigerant gas flows through the hole (25a) opened in the partition plate (25). It flows through and flows into the outer peripheral space (41). At this time, part of the lubricating oil and the metal powder sucked by the suction member (6) is discharged to the outer peripheral space (41).

[Step 2] As shown in FIG. 3, when the piston rod (23) located near the bottom dead center moves away from the crankshaft, the volume of the guide space (4) decreases. Due to the volume reduction, the gas pressure in the guide space (4)
The pressure becomes higher than that of the piston drive chamber (11), the check valve (27b) in the hole (27a) closes, and the check valve (4b) in the hole (4a) opens. By opening the check valve (4b), the refrigerant gas in the outer peripheral space (41) becomes a hole.
The gas is discharged from (4b) into the piston drive chamber (11), and the gas in the inner peripheral space (42) flows from the hole (25a) into the outer peripheral space (41) and is discharged into the piston drive chamber (11). At this time, the sucking member (6) sucking the lubricating oil and the metal powder in the above step 1
Is sandwiched between the partition plate (25) and the piston guide (27) and compressed, and the lubricating oil and the metal powder are discharged. Lubricating oil, etc., discharged is sucked out from the hole (25a) and
It is discharged to the piston drive chamber (11) via 1).

The above steps 1 and 2 are repeated by the rotation of the crankshaft (12). Lubricating oil, metal powder, etc. flowing into the guide space (4) are sucked by the suction member (6), and lubricating oil, etc. sucked by the suction member (6) are moved by the reciprocating movement of the piston guide (27). , Perimeter space
Since it is discharged to the piston drive chamber (11) through the (41) or the outer peripheral space (41), it does not adhere to the piston rod (23). Therefore, the lubricating oil or the like that has conventionally adhered to the piston rod (23) flows into the back pressure space (21) and then into the surface pressure space (16), which lowers the heat exchange rate of the regenerative heat exchanger (14). However, the above problem is solved by the sealing mechanism of the present invention. Furthermore, by preventing the metal powder from flowing into the back pressure space (21), the piston (22) and the piston ring (2
Wear of the inner surfaces of 2a) and the piston working chamber (2) is prevented. Further, by arranging the check valves (27b) and (4b) as in the above embodiment, the inner peripheral space (4
A gas flow from 2) to the outer peripheral space (41) is generated, and the suction member
The lubricating oil etc. sucked up in (6) can be sucked out more from the hole (25a).

By making the expansion side piston working chamber (3) have the same structure, the suction member (6) prevents the lubricating oil and the metal powder from adhering to the piston rod (33), and the expansion side back of the lubricating oil or the like. Invasion into the pressure space (31) is prevented, the heat exchange rate of the regenerative heat exchanger (14) is reduced, and the expansion side piston (32), piston ring (32a) and piston working chamber (3) inner surface are also prevented from wearing. To be done.

As another embodiment of the present invention, as shown in FIG. 5, from the inner space (42) to the outer space in the hole (25a) of the partition plate (25).
Deploy a check valve (25b) that allows only gas flow to (41),
Even if a check valve (4b) that allows only gas flow from the outer peripheral space (41) to the piston drive chamber (11) is provided in the hole (4a) of the cross guide (43), the piston guide (27) reciprocates. By moving
A gas flow from the inner peripheral space (42) to the outer peripheral space (41) is generated, and the lubricating oil or the like sucked by the suction member (6) can be sucked out from the hole (25a).

As a further different embodiment of the present invention, as shown in FIG. 6, only the gas flow from the piston drive chamber (11) to the inner peripheral space (42) is allowed in the hole (27a) of the piston guide (27). A check valve (27b) is installed, and the inner space (4) is installed in the hole (25a) of the partition plate (25).
Check valve (2) that allows only gas flow from (2) to outer space (41)
Deploy 5b). According to this configuration, the piston guide (2
During the process in which 7) moves in the direction away from the crankshaft (12), the refrigerant gas in the inner space (42) and the lubricating oil, metal powder, etc. contained in the suction member (6) are sucked from the hole (25a). Will be issued.

As shown in FIG. 7, the holes (4a) (25a) (27a)
In at least two of the directions opposite to those in the above embodiment, that is, from the piston drive chamber (11) through the hole (4a), the outer peripheral space (41) and the hole (25
a), the inner space (42), the hole (27a) and then the piston drive chamber (11)
Check valve (4b) (25b) (27b) that allows only gas flow to flow
The same effect can be obtained by including. Further, by forming the oil sump (29) in the hole (27a), the suction member (6) is compressed when the suction member (6) is compressed.
It is also possible to temporarily store the lubricating oil or the like discharged from the device.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a Stirling refrigerator of the present invention.

FIG. 2 is an enlarged view of a cross guide portion.

FIG. 3 is an enlarged view of a cross guide portion.

FIG. 4 is a perspective view of a telescopic body.

FIG. 5 is an enlarged view of a cross guide portion of another embodiment.

FIG. 6 is an enlarged view of a cross guide portion of still another embodiment.

FIG. 7 is an enlarged view of a cross guide portion of another embodiment.

FIG. 8 is a sectional view of a conventional Stirling refrigerator.

[Explanation of symbols]

 (1) Stirling refrigerator (2) Compression side piston working chamber (20) Compression chamber (22) Compression side piston (27) Piston guide (43) Cross guide (5) Telescopic body (6) Suction member

Claims (2)

[Claims] 1. A piston working chamber (2) in which a piston (22) slides back and forth, and a piston driving chamber having a piston driving mechanism.
(11) is separated from the partition plate (25), the piston (22) is linked to the piston drive mechanism via the piston rod (23), and the piston (22) slides by the drive of the piston drive mechanism. In the sealing mechanism of the gas compression expander that compresses or expands the gas in the piston working chamber, the partition plate (25) has a cylindrical cross guide surrounding the piston rod (23) on the piston drive chamber (11) side. (43) is provided, and a piston guide (2) that reciprocates in a guide space (4) formed in the cross guide (43) is provided on the piston rod (23).
7) is attached, a hole (27a) is opened in the piston guide (27) to communicate the guide space (4) with the piston drive chamber (11), and the cross guide (43) has a guide space (4). ) And the piston drive chamber (11) are communicated with each other, a hole (4a) is opened therethrough, and a cylindrical suction member (6) is provided to surround the piston rod (23) in the guide space (4). Partition plate (25) and piston guide inside the guide (43)
An annular telescopic body (5) whose ends are engaged with (27) is provided so as to surround the hole (27a) opened in the piston guide (27), and the guide space (4) is surrounded by an outer peripheral space ( 41) and inner space (42)
The partition plate (25) is provided with a hole (25a) that connects the inner peripheral space (42) and the outer peripheral space (41) to each other, and the hole (27a), the hole (25a), and the hole (4a) are connected to each other. At least two
Piston drive chamber (11) to hole (27a), inner space (42), hole (25
a), the outer peripheral space (41) and the hole (4a) through the piston drive chamber (1
Check valve (27b) (25b) that allows gas flow only in the direction of (1)
b) (4b) is provided, and when the piston (22) slides, the suction member (6) is sandwiched between the piston guide (27) and the partition plate (25) and compressed, and the lubricating oil is discharged and discharged. Lubricating oil should be
a), through the outer peripheral space (41) and the hole (4a), flow out to the piston drive chamber (11), and when the suction member (6) returns to its original form, the lubricating oil in the inner peripheral space (42) is removed. A sealing mechanism for a gas compression expander characterized by absorbing. 2. A piston working chamber (2) in which a piston (22) slides back and forth, and a piston driving chamber having a piston driving mechanism.
The (11) and (11) are separated by a partition plate (25), the piston (22) is linked to the piston drive mechanism via the piston rod (23), and the piston (22) slides due to the drive of the piston drive mechanism. In the seal mechanism of the gas compression expander that compresses or expands the gas in the working chamber, the partition plate (25) has a cylindrical cross guide (around the piston drive chamber (11) side that surrounds the piston rod (23). 43) is provided, and the piston rod (23) has a piston guide (2) that reciprocates in a guide space (4) formed in the cross guide (43).
7) is attached, a hole (27a) is opened in the piston guide (27) to communicate the guide space (4) with the piston drive chamber (11), and the cross guide (43) has a guide space (4). ) And the piston drive chamber (11) are communicated with each other, a hole (4a) is opened therethrough, and a cylindrical suction member (6) is provided to surround the piston rod (23) in the guide space (4). Partition plate (25) and piston guide inside the guide (43)
An annular telescopic body (5) whose ends are engaged with (27) is provided so as to surround the hole (27a) opened in the piston guide (27), and the guide space (4) is surrounded by an outer peripheral space ( 41) and inner space (42)
The partition plate (25) is provided with a hole (25a) that connects the inner peripheral space (42) and the outer peripheral space (41) to each other, and the hole (27a), the hole (25a), and the hole (4a) are connected to each other. At least two
From the piston drive chamber (11) to the hole (4a), the outer peripheral space (41), the hole (25
a), the inner space (42) and the hole (27a) through the piston drive chamber (1
Check valve (27b) (25b) that allows gas flow only in the direction of (1)
b) (4b) is provided, and when the piston (22) slides, the suction member (6) is sandwiched between the piston guide (27) and the partition plate (25) and compressed, and the lubricating oil is discharged and discharged. Lubricating oil has holes (27a)
Through the piston drive chamber (11) and the suction member (6)
A seal mechanism for a gas compression expander, which absorbs lubricating oil in the inner peripheral space (42) when returning to the original shape.