JPH085180A - Four cylinder type gas refrigerator - Google Patents

Abstract

PURPOSE:To improve the steady operation and the life of an engine by reducing the vibration generated in a gas refrigerator. CONSTITUTION:A high-temperature chamber 10 and a low-temperature chamber 20 are disposed symmetrically with respect to a crank shaft 51 in a CY heat gas engine. An intermediate-temperature chamber is split to two chambers, which are disposed symmetrically with respect to the crank 51. Pistons 31, 43 having the same outer diameter, stroke, weight and weight distribution are reciprocated in intermediate-temperature chambers 30, 40 at the same speed and displacement with respect to the shaft 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a low temperature part, a medium temperature part, and
By moving the working gas between the middle temperature part and the high temperature part,
Reduction of vibration and improvement of service life of gas refrigerators such as Cook-Yarborogh cycle engine, which cools the low temperature part by absorbing heat from the low temperature part by heat energy obtained from the high temperature part heat source Is.

[0002]

2. Description of the Related Art A Stirling cycle is known as a heat cycle with high thermal efficiency, and a conventional three cylinder, two displacer type gas refrigerator (Cooke-Yar) is applied.
The structure and operation of a borogh cycle engine, hereinafter referred to as "CY engine") will be described with reference to FIGS. As shown in FIG. 6, a three-cylinder, two-displacer type CY engine is filled with a working gas such as helium, hydrogen and nitrogen, and a casing (5) having a crankshaft (51) has a high temperature part (1) and a medium temperature part. Department
(3) and low temperature section (2), high temperature section (1) and medium temperature section (3)
Between the low temperature part (2) and the middle temperature part (3), the gas flow path (71)
(73) is formed. Further, the high temperature part (1) and the low temperature part (2) are arranged at about 20 ° from the facing position with respect to the crankshaft (51), and the middle temperature part (3) is arranged from the high temperature part (1) and the low temperature part (2). They are arranged at positions that are substantially equidistant from each other.

In the high temperature section (1), the high temperature section displacer (17) is fitted in a high temperature section displacer chamber (17) having a high temperature section gas passage (61) so that the high temperature section displacer (11) can move back and forth. 17) is divided into a high temperature room (10) and a high temperature middle greenhouse (13). The high temperature greenhouse (10) and the high temperature middle greenhouse (13) are respectively provided with gas outflow inlets (18) and (19).
Connected to (61) respectively. In the high temperature part gas flow path (61),
A high temperature regenerator (12) is provided between the gas outflow inlets (18) and (19). The high temperature part displacer (11) connects the tip of a piston rod (15) that penetrates the partition wall (53) in an airtight manner, and the other end of the piston rod (15) is connected to the crankshaft (51) via the crank rod (14). ) Is engaged. Outside the high temperature part (1),
A heating device (16) having a heating means such as a gas combustion device is provided, and the heating device (16) always operates in the high temperature chamber (1
Supplying heat to 0).

The low temperature section (2) is provided with a low temperature section gas passage (62), and the low temperature section displacer (21) is reciprocally fitted into the low temperature section displacer chamber (27) so that the low temperature section displacer chamber (27). ) Is divided into a low temperature room (20) and a low temperature middle greenhouse (23). The low greenhouse (20) and the low temperature middle greenhouse (23) are respectively provided with gas outflow inlets (28) and (29), which are connected to the low temperature gas passage (62), respectively. Low temperature gas passage (62)
Between the gas outlets (28) and (29)
It has (22).

The low temperature displacer (21) connects the tip end of a piston rod (25) that penetrates the partition wall (54) in an airtight manner, and the piston rod (25) is connected to the crankshaft (51) via the crank rod (24). ) Is engaged. Outside the low temperature section (2), a low temperature section heat absorber (26) such as a multi-tube heat exchanger or a fin type heat exchanger is provided and is connected to an object to be cooled.

The intermediate temperature section (3) comprises an intermediate temperature section gas passage (63), and an intermediate temperature section cylinder chamber (34) communicating with the gas passage (63) through a gas outlet (35) and the cylinder chamber. The intermediate temperature part power piston (31) is fitted in the (34) so as to be able to reciprocate, and the crank rod (32) for engaging the power piston (31) with the crank shaft (51). The crankshaft-side engaging end of the crankrod (32) is provided at the same angle as the crankshaft-side engaging end of the crankrod (14) of the high temperature displacer (11) as shown in FIG. Engage with 55).
The upper part of the piston of the cylinder chamber (34) that is compressed and expanded by the power piston (31) is the middle greenhouse (30). A radiator (33) such as a radiator is provided outside the middle temperature section (3).

The gas flow paths of the high temperature part (1) and the intermediate temperature part (3)
(61) and the gas flow path (63), and the low temperature part (2) and the medium temperature part (3) gas flow path (62) and the gas flow path (63) are respectively formed by the gas flow paths (71) and (73). It is connected.

The regenerators (12) and (22) have a structure in which wire nets are laminated or a metal is in the form of wool, and the temperature difference between the gas temperature and the temperatures of the regenerators (12) and (22) is Use the regenerator (1
2) It is a device that takes away the heat of the high-temperature gas passing through (22), stores it, and releases the stored heat to the low-temperature gas that has passed through from the opposite direction again.

Further, the piston rods (15) and (25) and the crank rods (14) and (24) are different from the crank shaft (51) in FIG.
Crank rod (32) is arranged symmetrically as shown in
They are arranged 90 ° out of phase with the other crank rods (14, 24).

Next, a 3-cylinder 2-displacer type C
The operating principle of the Y engine will be described. FIG. 10 is a T-S diagram (temperature-entropy) showing heat transfer and pressure change of the working gas.
It was drawn in. As shown in FIG. 6, the most advanced displacer (11) in the high temperature section (1), when the volume of the hot chamber (10) is the smallest, the heat Q _h by the heating device (16) a high temperature chamber (10) When supplied, the working gas in the high temperature chamber (10) is
(A) is heated and expanded from an intermediate position, and the working gas pushes down the high temperature displacer (11) (arrow A). As a result, the piston rod engaged with the displacer (11)
(15) and the crank rod (14) rotationally drive the crank shaft (51) (first stage, FIG. 10 (a)).

With the downward movement of the displacer (11),
The working gas that filled the greenhouse (13) in the high temperature part was discharged from the outlet (1
It is pushed out to the high temperature part gas flow path (61) from 9). Further, as will be described later, the power piston (31) is in the middle of ascending movement in the middle temperature part (3), and the working gas extruded from the middle greenhouse (30) also passes through the gas flow path (71) to the high temperature part gas flow path. Flow into (61).

The high temperature chamber (10) and the low temperature chamber (20) of the first stage
The temperature of the working gas that operates in the following changes as follows. As the working gas passes through the high temperature regenerator (12) in the third stage described later, the working gas at 45 to 50 ° C in the middle greenhouse (13) (30) is transferred to the high temperature regenerator (12). By absorbing the stored heat, it is heated to a set temperature of about 300 to 500 ° C. and flows into the high temperature chamber (10) (arrow a). Similarly, when the working gas passes through the low temperature regenerator (22), the
The working gas of 50 ° C. is cooled to the set temperature of about −30 to 0 ° C. by the cooling power stored in the low temperature regenerator (22) and flows into the low temperature chamber (20) (arrow b).

As shown in FIG. 7, the low temperature displacer (21) and the intermediate temperature power piston (31) move toward the crank shaft (51) by the rotational drive of the crank shaft (51) (arrow B, C) Do. As the low temperature displacer (21) moves, the low temperature chamber (20) expands. Due to the expansion of the low greenhouse (20), the working gas inside the low temperature chamber (2) expands isothermally, and the heat quantity Q _l corresponding to the work done by the expansion is absorbed from the low temperature section heat exchanger (26), The temperature of (30) is -30 to 0
It is kept at the set temperature of ℃ (2nd step, Fig. 10)
(b ')).

As shown in FIG. 8, when the displacers (11) and (21) move to near the bottom dead center, the displacers (11) and (21) are
The volume of the high temperature chamber (10) and the low temperature chamber (20) is hardly changed by the angular displacement of the crankshaft (51), but the power piston (3
1) shifts toward the crankshaft (51) further due to the 90 ° phase shift (arrow C), expands the volume of the middle greenhouse (30) and lowers the pressure. Therefore, due to the pressure difference, the working gas moves from the high temperature chamber (10) and the low temperature chamber (20) to the middle greenhouses (13) (30) (23) (arrows a, b). At this time, the working gas heated in the high temperature chamber (10) is lowered to around 50 ° C by the regenerator (12), and the working gas frozen in the low temperature chamber (20) is cooled by the regenerator (22).
Temperature rises to around 50 ° C (3rd stage, Fig. 10 (c))
(c ')). Further, as the crankshaft rotates, the displacers (11) and (21) start to rise.

As shown in FIG. 9, the displacer (11) (21)
However, when the crankshaft (51) rotates, the volumes of the high-temperature chamber (10) and the low-temperature chamber (20) hardly change, but the power piston (31) further increases the crankshaft ( It moves in the direction away from 51) (arrow C), and the volume of the middle greenhouse (30) is reduced. Due to the reduction of the volume of the middle greenhouse (30),
The working gas arranged in (30) is compressed, the temperature of the working gas is raised by the compression, and heat Q _m is released to the outside through the intermediate temperature heat exchanger (33). When the outside air temperature is 30 ° C, the temperature of the working gas in the greenhouse (30) in the middle temperature part is about 50 ° C to the radiator (3
The heat is released by 3) and the temperature drops to about 45 ℃. As the power piston (31) moves upward, the high temperature chamber (10) and the low temperature chamber (2
The pressure of 0) rises. Further, the crank rotation causes the displacers (11) and (21) to start moving toward the crank shaft (51) (fourth stage, (d) and (d ') in FIG. 10).

After the lapse of the fourth stage, the process returns to the first stage. According to the above operation principle, the heat given to the engine from the heating device (16) causes the low temperature section heat exchanger (26) to generate refrigeration. or,
The heat absorbed by the high temperature section heating device (16) and the low temperature section heat exchanger (26) is released by the middle temperature section heat exchanger (33). In order to assist the driving of the crankshaft (51), an auxiliary motor (90) may be attached as shown in FIG.

[0017]

In a conventional CY engine, a balancer such as a counterweight is attached to a portion of the crankshaft facing the intermediate temperature power piston as a measure against vibration caused by vertical movement of the intermediate temperature power piston. As a result, the intermediate temperature power piston relaxes the load acting on the sliding mechanism.
However, although the balancer corresponds to the specified drive speed, for other speeds, the balancer may act in the opposite direction to the load relaxation, and the dynamic balance cannot be maintained. It is not a vibration suppression method. Furthermore, the CY engine is rotating at a high speed (800-1500 rpm),
The load acting on the sliding mechanism such as the crank mechanism in order to enclose and drive the working gas at high pressure (2 MPa or more) is the load due to the pressure of the working gas rather than the load due to the inertial force of the mechanism components. Often becomes dominant. The occurrence of the above-mentioned vibration adversely affects the life of the engine. The present invention clarifies a CY engine aiming at reducing the above-mentioned vibrations, quiet operation of the engine, and improving the life of the engine.

[0018]

In order to solve the above-mentioned problems, in a CY engine of the present invention, a conventional 3-cylinder 2-displacer type gas refrigerator (or 3-cylinder 3-piston type gas refrigerator) is used. , The high temperature part (1) and the low temperature part (2) are arranged symmetrically with respect to the crankshaft (51), and the displacer (1
1) (21) (or power pistons (81) (82)) are simultaneously moved symmetrically. In addition, the middle temperature section has the same volume as the middle greenhouse (3) and the middle greenhouse.
Divided into (4), symmetrically arranged with respect to the crankshaft (51),
The power pistons (31, 41) having the same outer diameter are reciprocated at the same speed and the same displacement amount.

The volumes of the high temperature chamber (10) and the low temperature chamber (20) are the same, and they are arranged symmetrically with respect to the crankshaft (51). or,
The displacer (11) (21) has the same outer diameter, stroke, shape, weight, weight distribution, and scavenging volume, and the crankshaft (5
Place symmetrically with respect to 1) and move symmetrically at the same time. Further, the mid-greenhouse is divided into mid-greenhouses (30) (40) having the same volume and arranged symmetrically with respect to the crankshaft (51). Further, in the middle greenhouse (30) (40), a power piston having the same outer diameter, stroke, shape, weight, weight distribution and scavenging volume.
(31) and (41) are arranged symmetrically and are moved symmetrically with respect to the crankshaft (51) at the same time. The volume changes of the middle greenhouses (30) (40) are simultaneous and always the same.

The displacers (11) and (21) are partition walls, respectively.
(53) (54) Airtightly penetrates the piston rod (15) (25) the end is connected, the other end of the piston rod (14) (24) is cranked through the crank rod (14) (24) It is engaged with the shaft (51). Further, the two power pistons (31) (41) are engaged with the crank shaft (51) by the crank rods (32) (42).

Further, the high temperature room (10), the low temperature room (20) and the middle greenhouse (3
The 0) and (40) have gas flow paths (61), (62), (63) and (64), respectively. Gas channel (61) of high temperature part (1) and gas channel (63) (64) of medium temperature part (3) (4), gas channel (62) of low temperature part (2) and medium temperature part (3)
The gas flow channels (63) and (64) of (4) are respectively gas flow channels (71) and (72) in order.
It is connected by (73) and (74). Furthermore, the gas flow path (61) (6
The regenerators (12) and (22) are installed in 2), respectively.

[0022]

[Operation and effect] The operation principle is the same as that of the conventional CY engine, but the intermediate temperature parts (3) and (4) are symmetrically arranged with respect to the crankshaft (51) to provide the intermediate temperature parts (3) and (4). Power Piston (3
1) (41) is moved symmetrically with respect to the crankshaft (51) at the same speed and the same amount of displacement in the middle greenhouses (30), (40) to and fro, so that the inertial force is controlled from the low speed range where pressure fluctuation is controlled. The load acting on the crankshaft (51) up to the high speed range is canceled. As a result, the vibration generated in the engine can be suppressed even for an arbitrary phase angle and rotation speed, so that the engine can be quietly operated and its life can be improved.

Further, in place of the displacer (11) (21) of the four-cylinder, two-displacer type gas refrigerator having the above structure,
As shown in FIG. 5, even in a 4-cylinder 4-piston type gas refrigerator using the power pistons (81) (82) and excluding the gas outflow inlets (19) (29) and the intermediate greenhouses (13) (23), Crankshaft (5
By arranging the intermediate temperature parts (3) and (4) symmetrically with respect to (1), the same effect can be obtained.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. First, an embodiment of a 4-cylinder 2-displacer type gas refrigerator (Cooke-Yarborogh cycle engine, CY engine) will be described. As shown in FIG. 1, a 4-cylinder 2-displacer type CY engine is filled with working gas such as helium, hydrogen, and nitrogen at a pressure of 2 to 5 MPa.
The casing (5) with the crankshaft (51) is
(1), low temperature section (2), middle temperature section A (3) and middle temperature section B (4), between high temperature section (1) and middle temperature sections (3) and (4), low temperature section (2) and middle temperature section Gas channels (71), (72), (73) and (74) are formed between (3) and (4), respectively. Also, the high temperature part (1) and the low temperature part (2), the middle temperature part A
(3) and the intermediate temperature section B (4) are arranged symmetrically with respect to the crankshaft (51).

The high temperature part (1) is fitted in a high temperature part displacer chamber (17) having a high temperature part gas passage (61) so that the high temperature part displacer (11) can reciprocate, and the high temperature part displacer chamber (17) is 17) is divided into a high temperature room (10) and a high temperature middle greenhouse (13). The high temperature greenhouse (10) and the high temperature middle greenhouse (13) are respectively provided with gas outflow inlets (18) and (19).
They are connected to 1) respectively. The high temperature part gas flow path (61) is provided with a high temperature part regenerator (12) between the gas outflow inlets (18) and (19).

The high temperature part displacer (11) connects the tip of a piston rod (15) that penetrates the partition wall (53) in an airtight manner, and the other end of the piston rod (15) is cranked through a crank rod (14). It is engaged with the shaft (51). A heating device (16) having a heating means such as a gas combustion device is arranged outside the high temperature part (1), and the heating device (16) constantly heats the high temperature chamber (10) during engine operation. The temperature inside the high temperature chamber (10) to 30
It is heated to 0-500 ℃.

The low temperature part (2) is arranged symmetrically to the high temperature part (1) with respect to the crankshaft (51). Low temperature gas flow path (6
2), the low temperature displacer chamber (27) has the same volume as the high temperature displacer chamber (17).
1) is fitted so that it can move back and forth, and the low temperature displacer chamber (2
7) is divided into a low temperature room (20) and a low temperature middle greenhouse (23). The low greenhouse (20) and the low temperature middle greenhouse (23) have gas outflow inlets, respectively.
(28) and (29) are opened and connected to the low temperature part gas flow path (62), respectively. The low temperature part gas flow path (62) is provided with a low temperature part regenerator (22) between the gas outflow inlets (28) and (29).

The low temperature displacer (21) connects the tip of a piston rod (25) that penetrates the partition wall (54) in an airtight manner, and the other end of the piston rod (25) is cranked through a crank rod (24). It is engaged with the shaft (51). The high temperature displacer (11) and the low temperature displacer (21) have the same outer diameter, stroke, weight distribution and weight.
(11) (32) are symmetrically the same speed with respect to the crankshaft (51),
It moves in the displacer chamber (17) (27) with the same displacement.
The changes in the volumes of the high greenhouse (10) and the low temperature chamber (20) and the two medium greenhouses (13) (23) are simultaneous and always the same. Outside the low temperature section (2), a low temperature section heat absorber (26) such as a multi-tube type or fin type heat exchanger is provided.

The intermediate temperature section A (3) is provided with an intermediate temperature section gas passage A (63), and the intermediate temperature section cylinder chamber A (34) communicates with the gas passage A (63) by a gas outflow inlet A (35). And the cylinder chamber A (34)
Middle temperature power piston A (31)
And the power piston A (31) to the crankshaft (51)
It is composed of a piston rod A (32) that engages with. The crankshaft side engaging end of the piston rod A (32) is connected to the crank rod (1) of the high temperature displacer (11) as shown in FIG.
It engages with a common crank pin (55) provided at the same angle as the crankshaft side engaging end of 4). Also, power piston A
The portion of the upper surface of the piston of the cylinder chamber A (34) that is compressed and expanded by (31) is defined as the inside greenhouse A (30). A radiator A (33) such as a radiator is provided outside the middle temperature section A (3).

The intermediate temperature section B (4) is arranged symmetrically with respect to the crankshaft (51) of the intermediate temperature section A (3). Middle temperature part B (4)
Has the same structure and size as the medium temperature part A (3).
Also, these are respectively designated as the medium temperature part gas flow path B (64), the gas outflow inlet B (45), the middle temperature part cylinder chamber B (44), the middle temperature part power piston B (41), the piston rod B (42), and the middle part. Greenhouse B (40). Outside the middle temperature section B (4), a radiator B (43) similar to the middle temperature section A (3) is provided.

The crankshaft engaging end of the piston rod B (42) is provided at the same angle as the crankshaft engaging end of the crank rod (24) of the low temperature displacer (21) as shown in FIG. The power piston A (31) and the power piston B (41) are engaged with the crank pin (56) and have the same outer diameter, stroke, weight distribution and weight.
1) and (41) move in the cylinder chambers (17) and (27) symmetrically with respect to the crankshaft (51) at the same speed and the same displacement amount. The changes in the volumes of the respective greenhouses (20) and (30) are simultaneous and always the same.

The gas channels (61) and the gas channels (63) and (64), and the gas channels (62) and the gas channels (63) and (64) are sequentially gas channels (71) and (72), respectively.
It is connected by (73) and (74).

The piston rods (15) and (25) and the crank rods (14) and (24) are shown in FIG.
As shown in FIG. 5, the crank rods (32) are arranged so as to be 90 degrees out of phase with the crank rods (14) and (24). In addition, the crankshaft (51) with respect to the crank rod
Place (42) symmetrically with the crank rod (32).

The basic operation of the CY engine having the above structure will be described. As shown in FIG. 1, when the displacer (11) is most advanced in the high temperature part (1) and the volume of the high temperature chamber (10) is minimum, heat Q _h is applied to the high temperature chamber (10) by the heating device (16). When supplied, the working gas in the high temperature chamber (10) expands from the intermediate position in FIG. 10 (a), and the working gas pushes down the high temperature section displacer (11) (arrow A). As a result, the piston rod (15) and the crank rod (14) engaged with the displacer (11) rotationally drive the crank shaft (51) (first
Step, (a) of FIG.

With the downward movement of the displacer (11),
The working gas that filled the greenhouse (13) in the high temperature part was discharged from the outlet (1
It is pushed out to the high temperature part gas flow path (61) from 9). In addition, as will be described later, the power pistons (31) (41) in the intermediate temperature parts (3) (4) are
The working gas that is in the process of rising and moving and is pushed out from the middle greenhouse (30) (40) also passes through the gas passages (71) (72) and the high temperature part gas passage (61)
Flow into.

The high temperature chamber (10) and the low temperature chamber (20) of the first stage
The temperature of the working gas that operates in the following changes as follows. As the working gas passes through the high temperature regenerator (12) in the third stage described later, the working gas that was 45 to 50 ° C. in the middle greenhouses (13) (30) (40) changed to the high temperature regenerator (12). By absorbing the heat stored in 12), it is heated to a set temperature of about 300 to 500 ° C. and flows into the high temperature chamber (10) (arrow a). Similarly, when the working gas passes through the low temperature regenerator (22), the inside greenhouse (23) (3
0) (40) the working gas was 45 ~ 50 ℃ low temperature regenerator (22)
Due to the cooling power stored in the cold storage chamber, the temperature is lowered to a set temperature of about -30 to 0 ° C., and the cold chamber flows into the low temperature chamber (20) (arrow b).

As shown in FIG. 2, when the crankshaft (51) is rotationally driven, the low temperature displacer (21) and the intermediate temperature power pistons (31) (41) move toward the crankshaft (51) ( Arrows B, C, D). As the low temperature displacer (21) moves, the low temperature chamber (20) expands. Due to the expansion of the low greenhouse (20), the working gas inside the low temperature chamber (20) expands isothermally,
A quantity of heat Q ₁ corresponding to the work performed by the expansion is absorbed from the low temperature section heat exchanger (26), and the temperature of the working gas in the low temperature chamber (20) is maintained at −30 ° C. (second step, FIG. 10). (B)).

As shown in FIG. 3, the displacer (11) (21)
Displacer (11) (21)
Does not substantially change the volumes of the high temperature chamber (10) and the low temperature chamber (20) with respect to the angular displacement of the crankshaft (51), but the power pistons (31) (41) are further out of phase by 90 °, Crankshaft
Move toward (51) (arrows C, D), middle temperature room, medium greenhouse
(30) Expand the volume of (40) and reduce the pressure. Therefore,
Due to the pressure difference, from the high temperature room (10) and the low temperature room (20) to the medium greenhouse (13)
(23) (30) (40) working gas moves (arrow a, b). At this time, the working gas heated in the high temperature chamber (10) is lowered to around 50 ° C. by the high temperature regenerator (12), and the working gas frozen in the low temperature chamber (20) is cooled by the low temperature regenerator (12). According to 22), the temperature rises to around 50 ° C. (third stage, (c) (c ′) in FIG. 10)). Further, as the crank rotates, the displacers (11) (21) start to rise.

As shown in FIG. 4, the displacer (11) (21)
However, when moving to near the top dead center, even if the crankshaft (51) rotates, the volumes of the high temperature chamber (10) and the low temperature chamber (20) are hardly changed, but the power pistons (31) (41) are further changed. Crankshaft (5
It moves in the direction away from 1) (arrows C and D), and the volume of the medium temperature room medium greenhouses (30) (40) is reduced. Medium-temperature department Medium greenhouse (30) (40)
Due to the decrease in the volume of the working gas placed in the greenhouse (30) (40) in the middle temperature part, the temperature of the working gas rises due to the compression, and the heat radiator (33) (43) Heat to the outside through Q
emit _m . When outside temperature is 30 ℃
The temperature of the working gas of (40) is about 50 ℃ from the heat exchanger (33) (43)
It is reduced to about 45 ° C due to the release of heat. Due to the upward movement of the power pistons (31) (41), the high temperature chamber (10) and low temperature chamber
The pressure of (20) rises. Also, the crank rotation causes the displacers (11) and (21) to start moving toward the crankshaft (fourth step, (d) and (d ') in FIG. 10).

After the lapse of the fourth stage, the process returns to the first stage. According to the above operating principle, when the outside air temperature is 30 ° C., the heat Q _h given to the engine from the heating device (16) causes the gas in the high temperature part (1) to reach 300 to 300 ° C.
By keeping the temperature at 500 ° C, the temperature of the low temperature heat exchanger (26) will be -30 ~
Freezing at around -50 ° C can be generated. The heat Q _l absorbed by a low-temperature portion heat exchanger, middle-temperature heat exchanger
It is released (Q _m ) at (33) and (43). In order to assist the driving of the crank shaft (51), as shown in FIG. 11, an auxiliary motor (9
1) may be attached.

In the above embodiment, the high temperature part (1) and the low temperature part
Although the middle greenhouses (13) and (23) are provided in (2), as shown in FIG. 5, the middle greenhouses (13) and (23) are not provided, and the displacers (11) and (21) are provided with pistons ( 81) (82) 4 cylinder 4
The piston type gas refrigerator has the same effect.

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 limiting 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.

For example, in the case of a CY engine in which the high temperature part and the low temperature part are symmetrically arranged with respect to the crankshaft, even in the CY engine other than the above embodiment, the two middle temperature parts are symmetrically arranged. By doing so, it is possible to reduce vibration and improve the life of the engine.

Furthermore, a Stirling refrigerator,
In the Vuilleumier cycle engine, the same effect can be obtained by dividing the expansion chamber and the compression chamber and arranging them symmetrically with respect to the crankshaft.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a 4-cylinder 2-displacer type gas refrigerator (first stage).

FIG. 2 is a sectional view of a second stage of FIG.

FIG. 3 is a sectional view of a third stage of FIG.

FIG. 4 is a cross-sectional view of the fourth stage of FIG.

FIG. 5 is a sectional view of a 4-cylinder type gas refrigerator.

FIG. 6 is a sectional view of a first stage of a conventional example.

7 is a cross-sectional view of the second stage of FIG.

8 is a cross-sectional view of the third stage of FIG.

9 is a cross-sectional view of the fourth stage of FIG.

FIG. 10 is a TS diagram of a CY engine.

FIG. 11 is a sectional view taken along line XX of FIG. 1 and viewed in the direction of the arrow.

12 is a cross-sectional view taken along the line ZZ of FIG. 6 and viewed in the direction of the arrow.

[Explanation of symbols]

 (1) High temperature part (11) High temperature part displacer (13) High temperature part medium greenhouse (16) Heating device (2) Low temperature part (21) Low temperature part displacer (23) Low temperature part medium greenhouse (3) Middle temperature part A (30) Mid-temperature room Mid-greenhouse A (31) Mid-temperature area Power piston A (4) Mid-temperature area B (40) Mid-temperature area Mid-greenhouse B (41) Mid-temperature area Power piston B (5) Casing (51) Crankshaft

Claims (2)

[Claims] 1. A high temperature part (1) and a middle temperature part in a casing (5).
(3) and a low temperature part (2) are provided and a working gas is filled in each part, a displacer (11) is slidably fitted in the high temperature part (1), and a heating device (1) is provided outside the high temperature part (1). 16), low temperature section
Displacer (21) is slidably fitted to (2),
A power piston (31) is slidably fitted to (3), and each displacer (11) (21) and power piston (31) are connected to a rotary spindle (51) via a motion conversion mechanism such as a crank mechanism. In the gas refrigerator, the high temperature part (1) and the low temperature part (2) are connected to the main shaft (51).
The two displacers (11) (2
1) are moved symmetrically at the same time, and the medium temperature part is divided into the medium volume greenhouse (3) and the medium volume greenhouse (4) which are symmetrically arranged with respect to the main axis (51) and have the same outer diameter. Power piston with (31) (4
A 4-cylinder type gas refrigerator that is reciprocally moved at the same time according to 1). 2. A high temperature part (1) and a middle temperature part in the casing (5).
(3) and low-temperature part (2) are filled with working gas, and the power piston (81) is slidably fitted in the high-temperature part (1) to heat the high-temperature part (1) outside. Low temperature part with device (16)
The power piston (82) is slidably fitted to (2) and the power piston (31) is slidably fitted to the intermediate temperature part (3), and each power piston (81) (82) (31) ) Is connected to the rotating main shaft (51) via a motion converting mechanism such as a crank mechanism, the high temperature part (1) and the low temperature part (2) are symmetrically arranged with respect to the main shaft (51). Then, the two power pistons (11) and (21) are moved symmetrically at the same time, and the middle temperature part is divided into a middle greenhouse (3) and a middle greenhouse (4) with the same volume and symmetrical about the main axis (51). The four-cylinder type gas refrigerator is characterized in that the power pistons (31) and (41) each having the same outer diameter are simultaneously reciprocated.