JP2003287297A - Sterling refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an air-cooled heat exchanger for radiation, of a simple structure capable of being suitably matched to a structure of a sterling refrigerator. <P>SOLUTION: The heat exchanger for radiation 29 has a heat exchange cylinder 37 provided with a radiation fin 36 on its outer face, a working medium passes through a working medium channel 40 for radiation, and the heat of the working medium is radiated to the outside air from the radiation fin 36. A compression cylinder 17 and an expansion cylinder 18 are air-cooled from the periphery by a radiation fin 41 formed on an outer surface of a part 42 of a cylinder block 15. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling refrigerating machine, and more particularly to a Stirling refrigerating machine in which a heat radiating heat exchanger for radiating the heat of working gas is air-cooled.

[0002]

2. Description of the Related Art In recent years, as a refrigerating device as an alternative to CFCs for global environmental problems, and having a wider operating temperature than conventional cooling devices, therefore, cold or heat utilization equipment for business use such as freezer, refrigerator, throw-in cooler, etc. , Low temperature liquid circulator, low temperature incubator, constant temperature bath, heat shock test device, freeze dryer, temperature characteristic test device, blood / cell storage device, cold cooler, and various other cooling and heating devices The Stirling refrigerator is in the spotlight as a refrigerator that can be applied to cold heat utilization equipment, is compact, has a high coefficient of performance, and has good energy efficiency.

By the way, in a heat engine such as a Stirling refrigerator, a working gas is hermetically sealed in a housing which constitutes a main body and has a crank chamber and a motor chamber. On the other hand, the working gas flows between the compression chamber (high temperature chamber) and the expansion chamber (low temperature chamber), and the cooling heat exchanger (low temperature side heat exchanger) and heat radiation disposed along this flow path. The heat exchanger (high temperature side heat exchanger) exchanges heat with the cold heat refrigerant and the heat radiating refrigerant, respectively.

FIG. 4 is a view showing a conventional example of a heat radiating heat exchanger that radiates the heat of working gas. The conventional heat radiating heat exchanger 54 has a narrow groove 55 on the inner surface and an outer surface. A heat exchanger cylinder 57 having heat radiation fins 56 is fitted and provided between a heat radiation housing 58 for heat radiation and an inner cylinder 59. Further, a cooling water passage 62 is formed so as to surround the compression cylinder 60 and the expansion cylinder 61.

According to this conventional heat dissipation heat exchanger 54, the working gas passes through the narrow groove 55, while the cooling water flows through the heat dissipation passage 63 between the heat dissipation heat exchange housing 58 and the heat dissipation fins 56. Thereby, the heat of the working gas is radiated to the cooling water. The cooling water passes through the heat dissipation path 63 and the cooling water path 62 and is sent to a radiator provided in a cooling water circulation path (not shown), and the heat is radiated.

[0006]

Since the heat dissipation heat exchanger of the above-mentioned conventional example is of the water cooling type, it is necessary to flow cooling water through the heat dissipation exchanger 54, the cooling water passage 62 and the radiator. Since it is complicated and it is necessary to provide a cooling water circulation pump and the like, there is a problem that the manufacturing cost is high and maintenance is troublesome.

Therefore, the present invention has an object to solve the above-mentioned conventional problems, and in order to simplify the structure of the Stirling refrigerator, an air-cooling type heat radiation having a simple structure that matches well with the structure of the Stirling refrigerator. It is an object to realize a heat exchanger for use.

[0008]

In order to solve the above problems, the present invention provides a heat radiating heat exchanger between a high temperature chamber and a low temperature chamber,
A stirling in which a regenerator and a cooling heat exchanger are arranged, and the working gas reciprocates between the high temperature chamber and the low temperature chamber by passing through the heat radiation heat exchanger, the regenerator and the cooling heat exchanger. In the refrigerator, the heat radiating heat exchanger has a heat exchange tube having an inner surface on which a narrow groove through which a working gas flows and an outer surface on which heat radiating fins are formed. There is provided a Stirling refrigerator in which the warm heat of the working gas is radiated to the outside air from the heat radiation fins.

In order to solve the above problems, the present invention has a cylinder block which constitutes a compression cylinder and an expansion cylinder above a crank chamber, and between the high temperature chamber of the compression cylinder and the low temperature chamber of the expansion cylinder, A heat exchanger for heat dissipation, a regenerator and a heat exchanger for cooling are provided,
A Stirling refrigerator in which working gas reciprocates between a high-temperature chamber and a low-temperature chamber by passing through the heat-radiating heat exchanger, the regenerator, and the cooling heat exchanger, wherein the heat-radiating heat exchanger has an inner surface. A Stirling refrigerator having a heat exchange tube having a thin groove through which a working gas flows and having heat radiation fins formed on the outer surface thereof, and having heat radiation fins formed on the outer surface of the cylinder block.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on examples with reference to the drawings. 1 to 3 are diagrams illustrating a Stirling refrigerator to which the present invention is applied, and FIG. 1 is a front view illustrating the entire configuration of the Stirling refrigerator 1. FIG. 2 is a diagram for explaining a main part of the Stirling refrigerator 1, and FIG. 3 is a diagram partially showing a right side view of a cross section.

The housing 2 made of casting of the Stirling refrigerator 1 has a motor chamber 4 and a crank chamber 5 which are kept in a hermetically sealed state and communicate with each other through a partition wall 3.
Have and. A motor 6 capable of rotating in the normal and reverse directions is arranged in the motor chamber 4, and the crank chamber 5 includes a crank shaft 7, connecting rods 8 and 9 which are rotationally driven by the motor 6, cross guide heads 10 and 11, and the like. A drive mechanism is provided.

Two crank parts 1 of the crankshaft 7
Reference numerals 2 and 13 are formed with a phase difference so that the crank portion 13 moves ahead of the crank portion 12 when the motor 6 rotates in the normal direction. As this phase difference, a phase difference of about 90 degrees is generally adopted. Connecting rods 8 and 9 are attached to the crank portions 12 and 13, and cross guide heads 10 and 11 are attached to the connecting rods 8 and 9.

A cylinder block 15 is attached to the upper portion of the crank chamber 5 in the housing 2 with a bolt 16 via a seat portion 14. The cylinder block 15 forms a compression cylinder 17 and a part (lower part) of the expansion cylinder 18.

The space above the compression piston 19 (compression space) that reciprocates in the compression cylinder 17 is the high temperature chamber 20,
In this, the working gas is compressed and becomes high temperature. The compression piston rod 21 connects the compression piston 19 and the cross guide head 10, and is provided so as to extend from the crank chamber 5 to the compression cylinder 17 through the top opening of the crank chamber 5. An oil seal mechanism 22 is attached between the top opening 5 ′ of the crank chamber 5 and the compression cylinder 17, and the compression piston rod 21 and the top opening of the crank chamber 5 (correctly, the inner peripheral edge of the opening) 5 ′. The gap between and is sealed to prevent oil from rising from the crank chamber 5.

On the other hand, the expansion cylinder 18 has a lower portion composed of the cylinder block 15 as described above, and an upper portion thereof.
It is composed of an inner cylinder 23 of a heat radiating heat exchanger 29 described later and an inner cylinder 24 of a cooling heat exchanger. An upper space (expansion space) of the piston 25 that slides back and forth in the expansion cylinder 18 is a low temperature chamber 26, in which the working gas expands and becomes a low temperature.

The expansion piston rod 27 connects the expansion piston 25 and the cross guide head 11 and is provided so as to extend from the crank chamber 5 into the expansion cylinder 18 through the top opening 5'of the crank chamber 5. An oil seal mechanism 28 is provided between the crank chamber 5 and the expansion cylinder 18.
Is attached to seal the gap between the expansion piston rod 21 and the top opening (correctly, the inner peripheral edge of the opening) 5 ′ of the crank chamber 5 to prevent oil from rising from the crank chamber 5. The expansion piston 25 is 90
It moves ahead by the phase of degrees.

A heat-radiating heat exchanger (high-temperature-side heat exchanger) 29, a regenerator 30, and a cooling heat-exchanger (low-temperature-side heat exchanger) 31 communicate with each other so as to surround the expansion cylinder 18, and are arranged in an annular shape. It is set up. Under the heat dissipation heat exchanger 29,
A manifold (flow path for working gas) 32 is formed around the inner cylinder 23.

At the upper end of the compression cylinder 17,
Communication hole 33 for communicating the high greenhouse 20 and the manifold 32
Are formed. The high greenhouse 20 and the low temperature chamber 26 are configured to sequentially communicate with each other through the communication hole 33, the manifold 32, the heat radiating heat exchanger 29, the regenerator 30, and the cooling heat exchanger 31.

The lower part of the inner cylinder 24 is fitted with the inner cylinder 23 and constitutes a part of the expansion cylinder 18. A cooling heat exchange housing 43 is arranged on the outer peripheral side of the upper part of the inner cylinder 24. It is detachably fixed to the cylinder block 15. The heat exchange housing 43 for cooling has a plurality of narrow grooves 45 on its inner surface, is fitted with the inner cylinder 24 to form a working gas flow path 46, and has cooling fins 47 on its outer surface.
This constitutes the cooling heat exchanger (low temperature side heat exchanger) 31.

The cooling heat exchanger 31 cools the cold heat refrigerant of the cold heat utilization equipment that utilizes the cold heat of the Stirling refrigerator of the present invention. Air, water, alcohol, HFE, PFC or the like is used as the cold heat refrigerant.

A regenerator 30 made of a regenerator material such as a metal mesh is arranged in an annular space between the inner cylinder 24 and the cooling heat exchange housing 43.

The space between the oil seal bellows 28 and the expansion piston 25 (the same applies to the space between the oil seal bellows 22 and the compression piston 19) is called a buffer space (buffer chamber) 48. The buffer space 48 is connected to the buffer tank 51 by a pipe 49,
The buffer tank 51 is connected to the crank chamber 5 (or the motor chamber 4) of the housing 2 by a pipe 50.

According to the present invention, in the Stirling refrigerator having the above-mentioned structure, a heat radiating heat exchanger (high temperature side heat exchanger)
The feature is that 29 is an air-cooling type heat exchanger having the following configuration.

The heat radiating heat exchanger 29 has a heat radiating heat exchanger 29 disposed above the cylinder block 15 and below the cooling heat exchange housing 43. The heat radiating heat exchanger 29 has a heat exchanger cylinder 37, and the heat exchanger cylinder 37 is mounted on the cylinder block 15 so that the lower part thereof fits into the hole 34 formed in the upper part of the cylinder block 15. Placed. Then, the lower flange 44 of the cooling heat exchange housing 43 and the upper flange 38 of the heat exchanger tube 37 are fixed with bolts 39.

The heat exchanger tube 37 has a plurality of thin grooves 35 formed on its inner surface so as to extend in the longitudinal direction thereof, and has heat radiating fins 36 formed on its outer surface. The heat exchanger cylinder 37 is concentrically fitted to the outer side of the inner cylinder 23, and the outer surface of the inner cylinder 23 and the narrow groove 35 form a heat radiating working gas passage 40.

The heat-releasing working gas passage 40 has an upper end opening communicating with the regenerator 30, and a lower end opening of the manifold 3.
It communicates with 2. In this way, the air-cooled heat radiation heat exchanger 29 is configured, and the working gas is the heat radiation working gas flow path 40.
The heat of the working gas is radiated from the radiation fins 36 to the outside air.

Further, on the outer surface of the cylinder block 15 at the portion 42 surrounding the compression cylinder 17 and the expansion cylinder 18, radiating fins 41 are also formed to cool the compression cylinder 17 and the expansion cylinder 18 by air. .

(Operation) Next, the operation of the Stirling refrigerator of the above embodiment of the present invention will be described. The motor 6 rotates the crankshaft 7 in the forward direction, and the crank portions 12 and 13 in the crank chamber 5 rotate 90 degrees out of phase.
The connecting rod 8 connected to the crank portions 12 and 13,
The compression piston 19 and the expansion piston 25 reciprocate through the cross guide heads 10 and 11, the compression piston rod 21, and the expansion piston rod 27 with a phase difference of 90 degrees.

While the expansion piston 25 is moving 90 degrees ahead and moving slowly near the top dead center, the compression piston 19 moves rapidly near the middle toward the top dead center to compress the working gas. The compressed working gas flows through the communication hole 33 and the manifold 32 into the radiating working gas flow passage 40 of the radiating heat exchanger 29, and the heat is radiated from the radiating fins 36 to the outside air. Further, the working gas is cooled by the cold heat stored in the regenerator 30, passes through the narrow groove 45, and is cooled in the low temperature chamber 26.
It flows into the (expansion space).

When the compression piston 19 slowly moves near the top dead center, the expansion piston 25 rapidly moves toward the bottom dead center, and the working gas flowing into the low temperature chamber 26 (expansion space) expands rapidly. Then cold heat is generated. As a result, the head portion (called a cold head) 48 including the heat exchanger 31 for cooling is cooled to a low temperature.

Then, in the cooling heat exchanger 31, the cold heat refrigerant for the cold heat utilizing equipment, which is in contact with the cooling fins 47, is cooled. When the expansion piston 25 moves from the bottom dead center to the top dead center, the compression piston 19 moves from the intermediate position toward the bottom dead center, and the working gas flows from the low temperature chamber 26 to the heat radiating working gas passage 40 of the cooling heat exchanger. The cold heat of the working gas flowing through the regenerator 30 is stored in the regenerator 30. Regenerator 30
The cold energy stored in (1) is reused to re-cool the working gas sent from the high temperature chamber 20 through the heat radiating heat exchanger 29 as described above.

Then, the cold heat refrigerant cooled in the cooling heat exchanger is sent from the outflow pipe 52 to various cold heat utilizing devices and used for cooling. For example, the cold heat refrigerant is sent to a cold heat refrigerant pipe in a cold heat utilization apparatus such as a freezer, and performs a freezing or cooling action in the cold heat utilization apparatus. Then, the cold heat utilization equipment circulates back to the cooling heat exchanger 31 through the inflow pipe 53 and is cooled again.

The buffer tank 51 has a buffer space 48.
The housing 2 has a uniform pressure, absorbs pressure fluctuations in the buffer space 48, and absorbs pressure fluctuations in the housing 2 so as not to affect the buffer space.

In the present invention, the heat radiating heat exchanger 29 has a heat exchanging tube 37 having heat radiating fins 36 formed on the outer surface thereof, and the working gas passes through the heat radiating working gas flow passage 40 to generate the working gas. The warm heat is radiated to the outside air from the radiation fin 36. Furthermore, since the compression cylinder 17 and the expansion cylinder 18 are air-cooled from the surroundings by the radiation fins formed on the outer surface of the portion 42 of the cylinder block 15, cooling water for heat radiation, a radiator, etc. are not required.

The embodiments of the present invention have been described above based on the examples, but the present invention is not limited to the above examples, and various modifications can be made within the scope of the technical matters described in the claims. It goes without saying that there are examples.

[0036]

As described above, according to the present invention, the air-cooling type heat-radiating heat exchanger that is well matched to the structure of the Stirling refrigerator is adopted. Since there is no need to provide a radiator and a radiator is not necessary, the structure of the Stirling refrigerator can be simplified, the manufacturing cost can be reduced, and the maintenance can be simplified.

[Brief description of drawings]

FIG. 1 is a front view for explaining the overall configuration of a Stirling refrigerator according to the present invention.

FIG. 2 is a diagram showing a main part of the Stirling refrigerator of FIG.

FIG. 3 is a right side partially cutaway front view illustrating a Stirling refrigerator according to the present invention.

FIG. 4 is a diagram showing a conventional example of a heat exchanger of a Stirling refrigerator according to the present invention.

[Explanation of symbols]

1 Stirling Refrigerator 2 Housing 3 Partition Wall 4 Motor Chamber 5 Crank Chamber 6 Motor 7 Crankshaft 8, 9 Connecting Rod 10, 11 Cross Guide Head 12, 13 Crank Part 14 Seat 15 Cylinder Block 16 Bolt 17 Compression Cylinder 18 Expansion Cylinder 19 Compression piston 20 Upper space (compression space) high temperature chamber 21 Compression piston rod 22 Oil seal bellows 23 Inner cylinder 24 Inner cylinder 25 of cooling heat exchanger Piston 26 sliding back and forth in expansion cylinder 18 Upper space (expansion space) Low greenhouse 27 Expansion piston rod 28 Oil seal bellows 29 Heat dissipation heat exchanger (high temperature side heat exchanger) 30 Regenerator 31 Cooling heat exchanger (low temperature side heat exchanger) 32 Manifold (working gas flow path) 33 Communication hole 34 Hole formed in the upper part of the cylinder block 35 Fine Grooves for Working Gas Flow Path on Inner Surface of Heat Exchanger Tube 36 Radiating Fins 37 Heat Exchanger Tube 38 Upper Flange of Heat Exchanger Tube 39 Bolts 40 Radiating Working Gas Flow Path 41 Radiating Fins 42 Compression Cylinder and Expansion Cylinder Cylinder block part 43 surrounding the heat exchange housing for cooling 44 Lower flange 45 of the heat exchange housing for cooling A plurality of fine grooves on the inner surface of the heat exchange housing for cooling 46 Working gas passage 47 Cooling fins 48 Buffer space (buffer chamber) 49 Tube 51 Buffer tank 52 Cold heat refrigerant outflow pipe 53 Cold heat refrigerant inflow pipe 54 Heat dissipation heat exchanger 55 Fine groove 56 Radiation fin 57 Heat exchanger tube 58 Heat dissipation heat exchange housing 59 Inner cylinder 60 Compression cylinder 61 Expansion cylinder 62 Cooling Water channel 63 Heat dissipation channel

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Goo Nakazaki             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takashi Inoue             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Ryosuke Asahibichi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Dai Kanai             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takehiro Nishikawa             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hiroshi Nishikawa             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Shinya Itabashi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hideyuki Inoue             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hirosuke Ogasawara             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Tetsuya Kato             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takashi Atomic             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd.

Claims (2)

[Claims] 1. A heat radiating heat exchanger, a regenerator and a cooling heat exchanger are arranged between a high greenhouse and a low temperature chamber, and a working gas is used for the heat radiating heat exchanger, the regenerator and cooling. A Stirling refrigerator that reciprocates between a high temperature chamber and a low temperature chamber by passing through a heat exchanger, wherein the heat radiating heat exchanger has a narrow groove through which a working gas flows and an radiating fin on an outer surface. A Stirling refrigerator having a heat exchange tube formed by forming the working gas, the working gas passing through the narrow groove, and the warm heat of the working gas is radiated to the outside air from the radiating fins. 2. A heat dissipation heat exchanger, a regenerator, and a heat exchanger, a regenerator, and a cylinder block which form a compression cylinder and an expansion cylinder are provided on a crank chamber, and between the high temperature chamber of the compression cylinder and the low temperature chamber of the expansion cylinder. A cooling heat exchanger is provided, and the working gas is the heat radiation heat exchanger,
A Stirling refrigerator that reciprocates between a high temperature chamber and a low temperature chamber by passing through a regenerator and a cooling heat exchanger, wherein the heat radiating heat exchanger is formed with a narrow groove in which a working gas flows, A Stirling refrigerator having a heat exchange cylinder having heat radiation fins formed on the outer surface thereof, and heat radiation fins formed on the outer surface of the cylinder block.