JP2003065623A - Stirling refrigerating engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirling refrigerating engine realizing improvement of efficiency inexpensively and easily without any complicated processing. SOLUTION: The stirling refrigerating engine is equipped with a regenerator 5 which is positioned in a gas passage provided outside a cylinder 1 making a compression space 8 communicate with an expansion space 9 and isolates the compression space thermally from the expansion space. In the gas passage, a plenum ring 14 for reducing the volume of the space 12 in the end part of the gas passage which continues to a vent 1a opened in the cylinder opening in the compression space is provided in the space 12 so that it does not block up a flow through the gas passage.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a Stirling refrigerating engine.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view of a conventional Stirling refrigerating engine. As shown in FIG. 11, the Stirling refrigerating engine has a cylinder 10 that forms a cylindrical space inside.
A displacer 103 and a piston 102 are arranged in the unit 1. A compression space 108 is provided between the displacer 103 and the piston 102, and an expansion space 109 is provided in contact with the end of the displacer 103 on the opposite side of the piston. A flow passage is formed between the compression space 108 and the expansion space 109 so that the working gas flows through the regenerator 105 arranged on the outer periphery of the cylinder 101. The regenerator 105 has a compression space 108 and an expansion space 109.
It is an essential element in the Stirling refrigeration engine in order to thermally isolate and.

The working gas is confined in the working space having the expansion space 109, the compression space 108 and the flow passage as main spaces. The working space is filled with a working gas such as helium, and the piston 102 is periodically moved back and forth in the axial direction of the cylinder 101 by the external power of a linear motor (not shown).

The reciprocating motion of the piston 102 is caused by the compression space 1
The working gas sealed in 08 causes a periodic pressure change. First, the working gas is guided to the expansion space 109 through the regenerator 105 due to the pulsation of the back pressure that has risen accompanying the compression in the compression space. During this movement of the working gas, the displacer 103 is periodically reciprocated along the axial direction due to the change in the movement amount of the working gas. Displacer 10
This reciprocating motion of 3 has the same period as the piston, and maintains a predetermined phase difference from the reciprocating motion of the piston.

The end of the displacer on the piston side is continuous with the displacer rod 104 having a small diameter. The displacer rod 104 penetrates the shaft hole of the piston and is connected to the other end of the spring 106 having one end fixed to the casing. The Stirling refrigerating machine having such a structure is called a free piston type Stirling refrigerating machine. Here, a free piston type Stirling refrigerating engine will be described, but the present invention is not limited to the free piston type refrigerating engine.

When the displacer 103 and the piston 102 reciprocate with an appropriate phase difference, the working gas enclosed in the working space in the cylinder constitutes a known thermodynamic cycle known as the reverse Stirling cycle. In this reverse Stirling cycle, the expansion space 109
Cold heat is generated, and high heat is generated in the compression space 108. Next, the principle will be described.

The working gas in the compression space 108 compressed by the piston 102 passes through the cylinder vent hole 101a, and from the gas passage end space 112 connected to this vent hole, the high temperature side heat exchanger 110a and the regenerator 105. To the expansion space 109 via the low temperature side heat exchanger 110b. During this movement, the working gas receives the cold heat stored in the regenerator 105 half a cycle before and is pre-cooled. Also,
The working gas passes through the high temperature side heat exchanger 110a and then the radiator 11
The heat generated in the compression space 108 is radiated from 1 to the outside. The high temperature side heat exchanger 110a and the radiator 111 are integrated to remove heat from the working gas and radiate it to the outside. The regenerator 105 has a function of thermally isolating the compression space 108 and the expansion space 109, and is an essential element in the Stirling refrigeration engine.

When most of the working gas flows into the expansion space, the pressure in the expansion space 109 rises and the expansion starts so as to push the displacer 103 toward the piston side. When the piston 102 expands to some extent, the returning force of the piston 102 pushes the displacer 103 in the opposite direction away from the piston. At this time, the pressure is reduced in the expansion space, and in the state where the pressure is reduced, the working gas in the expansion space 109 flows from the low temperature side heat exchanger 110b to the regenerator 105, the high temperature side heat exchanger 110a, and the gas. It passes through the passage end space 112 and moves again to the compression space 108. At this time, heat is taken from the outside by the heat absorber 116 via the low temperature side heat exchanger 110b. Low temperature side heat exchanger 110b and heat absorber 116
And, together, give heat to the working gas and take away heat from the outside.

As a result, the outside air facing the heat absorber 116 is cooled. In this way, when most of the working gas returns to the compression space 108, the compression cycle of the piston 102 is again received and the next cycle starts. By continuously repeating such a series of cycles, the heat absorber 1
A cryogenic cold can be taken out around 16.
On the contrary, the heat radiation effect can be used around the radiator 111.

[0010]

In the Stirling refrigerating engine, the volume of the gas passage end space 112 surrounded by the flange portion 101b of the cylinder 101, the casing 113, and the high temperature side heat exchanger 110a is reduced. ,
Performance such as thermal efficiency is improved. That is, this gas passage end space is a space that should also be called a dead space when the heat medium is circulated by repeating compression and expansion,
By reducing the volume of this portion, the working gas circulates efficiently. However, in the conventional Stirling refrigeration engine, the flange portion 101b of the cylinder 101,
By reducing the distance from the high temperature side heat exchanger 110a,
The volume of the gas passage end space 112 was reduced. However, since it is necessary to secure the opening area of the vent hole 101a, the volume of the gas passage end space 112 cannot be made sufficiently small.

Further, the flange portion 101 of the cylinder 101
When the cross section of the gas passage end space 112 in the vicinity of b is a plane orthogonal to the central axis 107, the sectional shape taken along the plane including the central axis is a rectangular cylindrical shape. Therefore, flow loss occurs in the flow of the working gas in the gas passage end space 112. Also, FIG. 12 and FIG.
As shown in FIG. 3, if the cross-sectional shape of the cut surface including the central axis of the gas passage end space 112 is trapezoidal or fan-shaped so as to reduce the flow loss of the working gas, the machining process becomes complicated. It was That is, when processing the shape of the flange portion 101b of the cylinder 101 into a conical shape or a dome shape so as to have the trapezoidal or fan-shaped cross-sectional shape described above, the processing method of the flange portion 101b and the vent hole 101a becomes complicated, There was a problem that resulted in higher costs. If the volume of the gas passage end space continuing to the expansion space 109 is also large, the thermal efficiency is reduced. However, in the case of the end space of the gas passage continuous with the expansion space, since it is the end of the cylinder, it is necessary to reduce the volume and to make the cross-sectional shape trapezoidal or fan-shaped in order to reduce the flow loss. There is no problem. That is, the target shape can be obtained by a simple processing.

Further, the high temperature side heat exchanger 110a faces the ventilation hole 101a so that the gas passage end space 11 is formed.
It is also possible to reduce 2. However, this arrangement requires redirection of the gas flow within the high temperature side heat exchanger. A heat exchanger that changes the flow direction by reducing the flow loss is very expensive and practically impossible.

Further, the performance of the Stirling refrigeration engine can be improved by reducing the gap between the cylinder 101 and the piston 102 or the gap between the cylinder 101 and the displacer 103. For this reason, the cylinder 101 is made of a metal that is easy to process. Therefore, the heat generated in the compression space may be radiated to the inside of the Stirling refrigerating engine through the flange portion 101b of the cylinder 101. There has been a situation where the heat radiation efficiency of the radiator 111 is reduced and the heat generation of the motor causes a reduction in efficiency.

It is an object of the present invention to provide a Stirling refrigerating engine which realizes efficiency improvement inexpensively and easily without complicated processing.

[0015]

A Stirling refrigerating engine according to the present invention has a cylinder, a displacer reciprocally movable in the cylinder, and a piston driven by a driving means, and is provided between the displacer and the end of the cylinder. A regenerator that has an expansion space and a compression space between the displacer and the piston, and that thermally isolates the compression space from the expansion space in a gas passage outside the cylinder that connects the compression space and the expansion space. It is a Stirling refrigeration engine equipped with. In this Stirling refrigerating engine, in a gas passage that is located outside the cylinder and connects the compression space and the expansion space, a gas passage is formed in a gas passage end space that is connected to a ventilation hole formed in the cylinder that opens in the compression space. So as not to block the distribution of
A filler is provided to reduce the volume of the gas passage end space (Claim 1).

With this structure, since the filling material may be formed of a member different from the cylinder and the like, it is not necessary to make the shape of the cylinder and the like complicated, and the shape of the conventional cylinder can be used as it is. For this reason, only the filling amount increases, and the machining cost of the cylinder, which causes a large increase in cost, does not increase. As a result, the volume of the gas passage end space that is continuous with the compression space, which is also called a dead space when the working gas is circulated by compression and expansion, can be simply reduced. This gas passage end space may be called a plenum space. Since the filler is arranged so as not to block the flow of gas but to ensure the flow of gas, the thermal efficiency of the Stirling refrigerating engine can be improved by the amount of the dead space reduced.

Although it is preferable that the above-mentioned cylinder is integrally formed as a whole from the viewpoint of axial alignment, etc., in consideration of cost reduction and the like, a plurality of cylinder portions are connected by bolts, nuts, etc. to form an integrated cylinder. Good.

In the above Stirling refrigerating engine of the present invention,
The packing is arranged in the gas passage end space so that the ventilation hole opens in the gas passage end space, and the surface of the packing facing the regenerator side can form the wall surface of the gas passage ( Claim 2).

With this configuration, the working gas reaches the regenerator through a short path, so that the gas flow loss is suppressed to a very low value. Therefore, as compared with the conventional Stirling refrigerating engine, the thermal efficiency can be improved because the volume of the gas passage end space is reduced.

In the Stirling refrigerating engine of the present invention, the packing may have a taper shape in which the cross section of the gas passage becomes wider toward the regenerator side so that the gas flow loss is reduced (claim 3). .

For example, when the filler protruding into the gas passage has a surface perpendicular to the direction of reciprocating motion, turbulence is generated at the ridges and corners surrounding the surface, making it difficult to greatly reduce flow loss. . As described above, turbulence and the like can be suppressed by making the cross section of the gas passage wider toward the regenerator side. As a result, it is possible to further reduce the fluid loss and improve the efficiency of the Stirling refrigerating engine.

In the Stirling refrigerating engine of the present invention, the cylinder has a cylindrical shape, and the filling material may be a ring arranged in the gas passage end space of the annular gas passage located along the outer periphery of the cylinder. (Claim 4).

The ring can be determined by the cross-sectional shape and the diameter according to the shape of the end space of the gas passage. For example, when it is formed of rubber or resin, it can be easily manufactured by extrusion molding or the like. With this configuration, it is possible to improve the thermal efficiency of the Stirling refrigerating engine very easily and at a low cost. Since the ring is arranged in the plenum space as described above, it may be called a plenum ring.

In the Stirling refrigerating engine of the present invention, it is desirable that the filling material is formed of a material having low thermal conductivity (claim 5).

By constructing the filling, for example the ring, of a material having a low thermal conductivity, the heat conduction is interrupted by this ring. Therefore, the amount of heat radiated to the inside of the Stirling refrigeration engine via the cylinder can be significantly reduced. Such heat leakage lowers the thermal efficiency of the radiator and also heats the linear motor or the like that drives the piston to reduce the efficiency of the linear motor. As described above, by blocking the heat conduction by the ring, it is possible to obtain the efficiency improvement by reducing the volume of the plenum space, and further it is possible to obtain the efficiency improvement based on the above heat radiation suppression.

The Stirling refrigerating engine of the present invention may further comprise a filler fixing means for fixing the filler so that the position thereof can be adjusted (claim 6).

In the Stirling refrigerating engine, the optimum position of the packing or the ring changes as the expansion space temperature decreases, the compression space temperature increases, and the pressure inside the casing in which the driving means is arranged fluctuates. . That is, the shape and position of the ring are determined by the trade-off of contradictory factors such as the volume control of the plenum space and the flow loss control of the gas passage, depending on the operating conditions.

For this reason, when a Stirling refrigerating engine is used in a device having similar but slightly different operating conditions, for example, various refrigerators, in an extreme case, as many different rings as the number of types of refrigerator models are arranged. It is necessary to have a Stirling refrigeration engine. However, with the above configuration, the same Stirling refrigerating engine is used, and by adjusting only the position of the ring, it becomes possible to apply the Stirling refrigerating engine of optimum specifications to all types of refrigerators.

In addition, even if the same model cannot theoretically accurately determine the optimum position of the ring, it is more certain that the optimum structure of the ring is manufactured and the optimum position of the ring is experimentally determined before shipment. There is. In such a case, the optimum position of the ring can be adjusted after the experiment. Further, even when a design change is made to a part of the parts, it can be adjusted to the optimum position after the experiment. As a result, it becomes possible to flexibly realize the maximum efficiency according to the production situation.

The Stirling refrigerating engine of the present invention may further comprise an operating condition detecting means for detecting an operating condition of the Stirling refrigerating engine (claim 7).

The above-mentioned operating state detecting means is (a) outside air atmosphere temperature detecting means, (b) temperature detecting means for the compression space, expansion space, radiator, heat absorber and other parts of the Stirling refrigerating engine, and (c). Pressure detection means for a compression space, expansion space of the Stirling refrigerating engine, a casing inner space where driving means such as pistons are arranged, and (d) driving means for pistons, for example, electric power supplied to a linear motor. Means, etc. In each state detected by such detection means, the position of the filling material for obtaining the maximum efficiency of the Stirling refrigerating engine is obtained in advance,
If they are collectively stored in a data table or the like, it is possible to adjust the position of the filling material according to each state and obtain the maximum efficiency.

In the Stirling refrigerating engine of the present invention, the previously determined relationship between the state index detected by the operating state detecting means and the position of the filler in the gas passage end space that maximizes the efficiency in the state index. And an packing moving means for automatically moving the packing to a position that maximizes efficiency based on the information stored in the optimum position storing means (claim 8). ).

With this configuration, even if the state of the Stirling refrigerating engine changes moment by moment, the plenum ring is automatically moved to the optimum position based on the above data table, etc., and the maximum efficiency is always obtained automatically. You can Therefore, high efficiency can be secured, and a wide range of application fields can be obtained.

In the Stirling refrigerating engine of the present invention, the driving means for driving the piston can be a linear motor arranged outside the cylinder accommodating the piston (claim 9).

The linear motor can be compactly arranged along the circumference of the cylinder. For this reason,
It becomes easy to reduce the structure of the Stirling refrigeration engine.

In the Stirling refrigerating engine of the present invention, the end of the displacer on the piston side is continuous with the displacer rod having a diameter smaller than that of the displacer, and the displacer rod penetrates the shaft hole formed in the piston.
It is possible to form a structure of a free piston type Stirling refrigerating engine in which a tip of the displacer rod is connected to a spring (claim 10).

With this structure, it is possible to obtain a small-sized free piston type Stirling refrigerating engine which is inexpensive and efficient.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view of an end space of a gas passage continuous with a compression space of a Stirling refrigerating engine according to Embodiment 1 of the present invention, taken along a plane including a piston shaft. The plenum ring 14 is arranged in contact with the flange portion 1b in the gas passage end space 12 surrounded by the flange portion 1b of the cylinder 1 and the casing 13. The gas passage end space 12 is connected to the ventilation hole 1 a formed in the cylinder opening to the compression space 8.

FIG. 2 is a perspective view of the cylinder 1 of FIG. 1 with the plenum ring 14 fitted therein. 1 is a sectional view taken along the line I-I in FIG. Cylinder 1
Is formed as a unitary body including the flange portion 1b in order to obtain accurate alignment. Therefore, the vent hole 1a cannot be opened over the entire circumference of the cylinder 1,
A column portion 1d having no opening is intermittently arranged around the cylinder.

In FIGS. 1 and 2, the ventilation hole 1a is
The axial length is shortened by the amount of the plenum ring. However, the gas passage from the compression space 8 to the regenerator 5 via the ventilation hole 1a and the high temperature side heat exchanger 10a is
Secured with a sufficiently low current loss. For this reason,
The volume of the gas passage end space (plenum space) 12 can be made sufficiently small while sufficiently reducing the gas flow loss. As a result, the thermal efficiency of this Stirling refrigerating engine can be improved by a simple structural change.

The optimum shape and position of the plenum ring are
Depending on the operating conditions of the Stirling refrigeration engine, it is a trade-off between the contradictory requirements of low flow loss and narrow plenum space. For example, in the case of a structure in which the flange portion 1b of the cylinder projects toward the high temperature side heat exchanger 10a, the volume of the gas passage end space 12 is originally narrow. In such a case, FIG.
As shown in, the plenum ring having a small cross-sectional shape is arranged in contact with the flange portion 1b apart from the ventilation hole 1a in order to reduce the flow loss.

(Second Embodiment) FIG. 4 is a sectional view of a Stirling refrigerating engine according to a second embodiment of the present invention in the vicinity of a plenum space. In the present embodiment, the cross section of the plenum ring 14 is tapered so that the cross section of the gas passage becomes wider toward the high temperature side heat exchanger. In the plenum ring in the present embodiment, as shown in FIG. 5, a guide 14d is further provided at a portion in contact with the column portion 1d of the cylinder.

FIG. 6 is a perspective view showing a state in which the plenum ring shown in FIG. 5 is fitted in a cylinder. Guide 14
Since d is aligned with the column portion 1d of the cylinder, it does not resist the gas flow. Rather, without this guide, gas would flow from the vent 1a to the cylinder column 1d.
It wraps around and forms turbulence and stagnation. Therefore, the flow resistance is increased. As shown in the present embodiment, by providing the guide 14d, there is no flow swirling around the pillar portion of the cylinder from the ventilation hole 1a, and the flow loss is reduced. Therefore, it is desirable that the shape of the guide 14d be smoothly tapered so that the cross-sectional shape gradually decreases from the portion in contact with the cylinder column to the plenum ring body. The taper in the cross section of this plenum ring may be linear, or as shown in FIG. 7, the tapered surface may be a concave curved surface to enlarge the gas passage.

(Embodiment 3) In Embodiment 3 of the present invention, a material having low thermal conductivity is used for the plenum ring of the Stirling refrigerating engine in Embodiments 1 and 2 described above. By the arrangement of this plenum ring with low thermal conductivity,
It is possible to prevent the heat from escaping into the Stirling refrigeration engine through the flange portion of the cylinder. On the contrary, as shown in FIG. 8, when heat leaks through the flange portion 1b of the cylinder, the heat efficiency of the high temperature side heat exchanger or the radiator is reduced. Further, the driving means of the piston such as a linear motor arranged on the outer circumference of the cylinder is heated to lower the efficiency thereof. In the present embodiment, in order to prevent the state shown in FIG. 8, a plenum ring having a low thermal conductivity is arranged in contact with the flange portion 1b.

(Embodiment 4) FIG. 9 is a sectional view of the vicinity of a gas passage end space of a Stirling refrigerating engine according to Embodiment 4 of the present invention. In this embodiment, the plenum ring 14 and the ring fixing means 15 for adjusting and fixing the position of the plenum ring are provided. As the ring fixing means, for example, a screw or a pin 15 screwed into a female screw hole provided intermittently along the axial direction can be used.

The plenum ring 14 is elastically pushed by the spring 17 toward the high temperature side heat exchanger 10a. When the ring fixing means is, for example, a screw screwed into a plurality of female screw holes arranged at appropriate intervals, the screw is screwed into the female screw at an appropriate position, and the screw is engaged with the recess provided on the outer peripheral surface of the plenum ring. The plenum ring can be fixed.

Therefore, the plenum ring can be aligned and fixed at a position where the efficiency of the Stirling refrigerating engine is maximized.

(Fifth Embodiment) FIG. 10 is a block diagram showing a Stirling refrigerating engine according to a fifth embodiment of the present invention. In the present embodiment, the linear motor 25 is used as the piston driving means. In the present embodiment, an operating state detection sensor for detecting the operating state of the Stirling refrigerating engine is further provided. The above-mentioned operating state detection sensor is composed of the following sensors. (A) Temperature sensor for detecting the ambient temperature of the outside air (b) Temperature sensor for the compression space, expansion space, radiator, heat absorber, etc. of the Stirling refrigeration engine (c) Compression space, expansion space, piston, etc. for the Stirling refrigeration engine In a state such as a space inside the casing where the drive means is arranged, a pressure sensor (d) a drive means such as a piston, a power sensor for detecting electric power supplied to a linear motor, for example, in each state detected by the above sensor, Plenum ring 14 for maximum efficiency of Stirling refrigeration engine
If the position is determined in advance and stored as a data table or the like, the optimum position can be automatically determined according to each state. Therefore, the position of the plenum ring can be adjusted to always obtain the maximum efficiency. An automatic ring moving means is used to move the position of the plenum ring. This automatic ring moving means comprises a spring 17 that elastically pushes the ring, and a pin 15 that engages with the outer peripheral recess of the ring. Further, the automatic moving mechanism 18 including a motor for moving the pin in a long hole along the axis, a motor for moving the pin up and down and fixing the pin by engaging the plenum ring, and the like can be used.

The automatic moving mechanism 18 including a motor has its moving position determined by the control device 19 and is moved toward that position. A signal is transmitted to at least one of the above-mentioned various sensors, for example, the temperature sensor 20 of the radiator 11, to the control device, and the plenum ring 14 is automatically placed at an optimal position stored in advance in accordance with the value of the signal. Move to.

As a result, even when the state of the Stirling refrigerating engine changes moment by moment, the maximum efficiency at that time can always be automatically obtained. Therefore, high efficiency can be secured, and a wide range of application fields can be obtained.

Although the embodiments of the present invention have been described above, the scope of the present invention disclosed above is merely an example, and the scope of the present invention is not limited to these embodiments of the present invention. . The scope of the present invention is shown by the description of the claims, and includes the meaning equivalent to the description of the claims and all modifications within the scope.

[0053]

By using the Stirling refrigerating engine of the present invention, it is possible to reduce the volume of the end space of the gas passage and the flow loss of the gas flow easily and inexpensively without complicated processing. Satisfaction can be realized and efficiency can be improved. Furthermore, by forming the plenum ring with a material having a low thermal conductivity, it is possible to prevent heat leakage and further improve the thermal efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view near a plenum space of a Stirling refrigerating engine according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a cylinder of the Stirling refrigerating engine of FIG. 1 in which a plenum ring is fitted.

FIG. 3 is a cross-sectional view near a plenum space of a Stirling refrigerating engine according to a modification of the first embodiment of the present invention.

FIG. 4 is a cross-sectional view near a plenum space of a Stirling refrigerating engine according to a second embodiment of the present invention.

5 is a perspective view showing a plenum ring arranged in a gas passage end space of the Stirling refrigerating engine of FIG. 4. FIG.

6 is a perspective view of the plenum ring of FIG. 5 fitted in the cylinder of FIG. 4.

FIG. 7 is a cross-sectional view near a plenum space of a Stirling refrigerating engine according to a modification of the second embodiment of the present invention.

FIG. 8 is a diagram showing heat leakage in a conventional Stirling refrigerating engine which is a comparative example with respect to the Stirling refrigerating engine of the third embodiment of the present invention.

FIG. 9 is a cross-sectional view near a plenum space of a Stirling refrigerating engine according to a fourth embodiment of the present invention.

FIG. 10 is a configuration diagram of a Stirling refrigerating engine according to a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram of a conventional Stirling refrigerating engine.

FIG. 12 is a cross-sectional view near a plenum space of a modified example of a conventional Stirling refrigerating engine.

FIG. 13 is a cross-sectional view in the vicinity of a plenum space of another modification of the conventional Stirling refrigerating engine.

[Explanation of symbols]

1 cylinder, 1a ventilation hole, 1b flange part, 2
Piston, 3 displacer, 4 displacer rod, 5 regenerator, 6 spring, 8 compression space, 9 expansion space, 10a high temperature side heat exchanger, 10b low temperature side heat exchanger, 11 radiator, 12 gas passage end space, 13 Casing, 14 plenum ring, 14d guide, 1
5 position fixing pin (screw), 16 heat absorber, 17 ring spring, 18 automatic movement mechanism, 19 control device, 20
Temperature sensor, 25 linear motor.

Claims (10)

[Claims] 1. A cylinder, a reciprocating displacer in the cylinder, and a piston driven by a driving means, wherein an expansion space is provided between the displacer and the cylinder end, and the displacer and the A regenerator having a compression space between the piston and a gas passage outside the cylinder that connects the compression space and the expansion space is provided with a regenerator that thermally isolates the compression space and the expansion space. A Stirling refrigerating engine, wherein in the gas passage, a gas passage end space connected to a ventilation hole formed in the cylinder opening to the compression space, so as not to block the flow of the gas passage, A Stirling refrigeration engine with a filling that reduces the volume of the gas passage end space. 2. The packing is arranged in the gas passage end space so that the ventilation hole opens in the gas passage end space, and the surface of the packing facing the regenerator side is the gas. The Stirling refrigerating engine according to claim 1, which constitutes a wall surface of the passage. 3. The Stirling according to claim 1, wherein the packing has a tapered shape in which a cross section of the gas passage is widened toward the regenerator side so that a flow loss of the gas is reduced. Refrigeration engine. 4. The cylinder is cylindrical, and the packing is a ring arranged in the gas passage end space of an annular gas passage located along the outer circumference of the cylinder. The Stirling refrigerating machine according to any one of 3 above. 5. The Stirling refrigerating engine according to claim 1, wherein the filling is made of a material having low thermal conductivity. 6. The Stirling refrigerating engine according to claim 1, further comprising a filler fixing means for fixing the filler so that its position can be adjusted. 7. The operating state detecting means for detecting an operating state of the Stirling refrigerating engine is further provided.
6. The Stirling refrigerating machine according to any one of 6. 8. A previously determined relationship between a state index detected by the operating state detecting means and a position of the filling in the gas passage end space for maximizing efficiency in the state index is stored. 8. The optimum position storing means and the packing moving means for automatically moving the packing to a position where efficiency is maximized based on the information stored in the optimum position storing means. Stirling refrigeration engine. 9. A drive means for driving the piston,
The Stirling refrigerating engine according to any one of claims 1 to 8, which is a linear motor arranged outside the cylinder that houses the piston. 10. The end of the displacer on the piston side is continuous with a displacer rod having a diameter smaller than that of the displacer, the displacer rod penetrating a shaft hole formed in the piston, and a tip of the displacer rod is a spring. Forming a structure of a free-piston type Stirling refrigerating engine connected to.
Stirling refrigerating machine according to any one of 1.