Compact Stirling Cooler

Abstract

The present invention discloses a compact Stirling refrigerator, comprising a compression assembly, a push assembly and a power assembly; the power assembly has a rotating shaft, an eccentric wheel is arranged on the rotating shaft, the compression assembly is connected to the eccentric wheel through a compression connecting rod, and the rotational motion of the rotating shaft is converted into the reciprocating motion of the compression assembly, the push assembly is connected to the eccentric wheel through a crescent-shaped push connecting rod, and the movement axis of the push assembly is deviated from the rotation axis. The present invention overcomes the shortcomings of the existing integral Stirling refrigerator in terms of compactness, volume and weight, and effectively reduces the push side length of the refrigerator through the structural form of the crescent-shaped push assembly and the movement axis of the push assembly is deviated from the rotation axis, so that the structure is more compact, the volume is smaller, and the installation space is reduced; at the same time, the load of the push assembly is reduced, and the reliability is improved, and it can be applied in infrared technology in the fields of reconnaissance and warning, guidance quality control, medium and high altitude long-range air defense, etc.

Description

Technical Field

[0001] The present invention relates to the field of Stirling refrigerators, and more particularly to a compact Stirling refrigerator. Background Art

[0002] Stirling refrigerator is a device that can generate cold source and provide low temperature environment for normal operation of chip. With the continuous application of infrared technology in the fields of reconnaissance and warning, guidance quality control, medium and high altitude long-range air defense, infrared focal plane detectors are constantly developing. As an important component of infrared detector, refrigerator provides low temperature working environment for chip, and also occupies 80~90% of the volume of detector. Its structure and volume determine the overall volume and weight of the detector.

[0003] With the diversification of application scenarios (such as outdoor and portable scenarios), infrared focal plane detectors are constantly developing towards light weight and small size. The existing integrated Stirling refrigerator is still insufficient in terms of compactness, volume and weight. Summary of the invention

[0004] Based on the fact that the existing integral Stirling refrigerator has a loose structure, a large volume required for installation, and a large lateral force, which is not conducive to the application in infrared focal plane detectors, it is now necessary to propose a compact Stirling refrigerator with the characteristics of compact structure and small volume. Due to these characteristics, when a portable infrared device is used, the installation space of the refrigerator can be effectively reduced, thereby reducing the size and weight of the system and improving the convenience of the equipment.

[0005] In order to achieve these purposes and other advantages of the present invention, the embodiments of the present invention provide the following technical solutions: a compact Stirling refrigerator, comprising a compression assembly, a push assembly and a power assembly;

[0006] The power assembly has a rotating shaft, on which an eccentric wheel is arranged. The compression assembly is connected to the eccentric wheel through a compression connecting rod, so as to convert the rotational motion of the rotating shaft into the reciprocating motion of the compression assembly. The pushing assembly is connected to the eccentric wheel through a crescent-shaped pushing connecting rod, so as to convert the rotational motion of the rotating shaft into the reciprocating motion of the pushing assembly, and make the movement axis of the pushing assembly deviate from the rotation axis of the rotating shaft.

[0007] In a preferred embodiment of the present invention, one end of the compression connecting rod is mounted on the eccentric wheel through a first bearing, and a third bearing is mounted on the other end of the compression connecting rod. The compression assembly includes a compression pin mounted on the inner ring of the third bearing and a compression piston driven by the compression pin and performing alternating reciprocating motion as the rotating shaft rotates. The compression piston is arranged in a compression cylinder for reciprocating motion to generate compressed gas.

[0008] In a preferred embodiment of the present invention, the compression connecting rod is an 8-shaped structure, one end of which is sleeved on the outer ring of the first bearing, and the other end of which is sleeved on the outer ring of the third bearing.

[0009] In a preferred embodiment of the present invention, the push assembly includes a fourth bearing, a fifth bearing, a guide piston, a push cylinder, a push pin and a cold storage component;

[0010] One end of the push connecting rod is connected to one end of the compression connecting rod through the outer ring of the fourth bearing, and the other end of the push connecting rod is installed on the outer ring of the fifth bearing. The push pin is installed on the inner ring of the fifth bearing. The push pin drives the guide piston to move back and forth alternately. The guide piston is arranged in a push cylinder for its reciprocating motion to generate compressed gas. The cold storage component is connected to the guide piston to achieve synchronous movement.

[0011] In a preferred embodiment of the present invention, the compression cylinder and the displacement cylinder are connected through a gas channel.

[0012] In a preferred embodiment of the present invention, it also includes a large base assembly, which includes a large base and a deep groove ball bearing; the power assembly is installed on the large base and the rotating shaft of the power assembly penetrates into the large base and is assembled on the deep groove ball bearing.

[0013] In a preferred embodiment of the present invention, the compression assembly, the pushing assembly and the power assembly are arranged at 90° to each other, and parts of the compression assembly and the pushing assembly are respectively located on both sides of the power assembly and are assembled in the large base.

[0014] In a preferred embodiment of the present invention, the power assembly includes a stator assembly and a rotor assembly;

[0015] The stator assembly includes a motor housing and a motor stator, and the rotor assembly includes the rotating shaft and a motor rotor.

[0016] In a preferred embodiment of the present invention, the rotor assembly further comprises a counterweight block, which is arranged at the portion of the rotating shaft located at the large base, and is used to balance the unbalanced force.

[0017] In a preferred embodiment of the present invention, the stator assembly and the rotor assembly are coaxially arranged.

[0018] Compared with the prior art, the present invention includes at least the following beneficial effects: the compact Stirling refrigerator of the present application is a miniature integral structure, which effectively reduces the length of the refrigerator's pushing side through the structural form of a crescent-shaped push assembly and makes the moving axis of the push assembly deviate from the rotation axis, making the structure more compact, smaller in size, and reducing the installation space; at the same time, the load of the push assembly is reduced, and the reliability is improved.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view a of a compact Stirling refrigerator according to an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view b of a compact Stirling refrigerator according to an embodiment of the present invention;

[0022] Figure 3 is a structural diagram of a compact Stirling refrigerator without a large base assembly according to one embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the connection between a compression assembly and a power assembly according to an embodiment of the present invention.

[0024] Explanation of the reference numerals: 1-compression assembly, 2-push assembly, 3-rotor assembly, 4-stator assembly, 5-large base assembly, 6-large base, 7-deep groove ball bearing, 8-rotating shaft, 9-counterweight, 10-motor rotor, 11-compression connecting rod, 12-third bearing, 13-compression pin, 14-compression piston, 15-compression cylinder, 16-push connecting rod, 17-fourth bearing, 18-guide piston, 19-push cylinder, 20-push pin, 21-cold storage component, 22-motor housing, 23-motor stator, 24-first bearing, 25 eccentric wheel, 26 large base inclined hole. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] Micro Stirling refrigerators are widely used in the field of military portable infrared equipment. The compact Stirling refrigerator of the present application can be used in the field of military portable infrared equipment. Figure 1 As shown, the present invention provides a compact Stirling refrigerator, comprising a compression assembly 1, a push assembly 2 and a power assembly;

[0030] The power assembly has a rotating shaft 8, on which an eccentric wheel 25 is arranged. The compression assembly 1 is connected to the eccentric wheel 25 via a compression connecting rod 11, so as to convert the rotational motion of the rotating shaft 8 into the reciprocating motion of the compression assembly 1. The pushing assembly 2 is connected to the eccentric wheel 25 via a crescent-shaped pushing connecting rod 16, so as to convert the rotational motion of the rotating shaft 8 into the reciprocating motion of the pushing assembly 2, and make the motion axis of the pushing assembly 2 deviate from the rotation axis.

[0031] In this embodiment, the large base assembly 5 serves as the outer shell of the refrigerator, and the compression assembly 1, part of the power assembly, and part of the push assembly 2 are assembled in the large base 6 and exist as a supporting structure.

[0032] This technical solution may also include the following technical details to better achieve the technical effect: Figure 1 , 4 As shown, one end of the compression connecting rod 11 is installed on the eccentric wheel 25 through the first bearing 24, and the third bearing 12 is installed on the other end of the compression connecting rod 11. The compression assembly 1 includes a compression pin 13 installed on the inner ring of the third bearing 12 and a compression piston 14 driven by the compression pin 13 and alternately reciprocating with the rotation of the rotating shaft. The compression piston 14 is arranged in a compression cylinder 15 for its reciprocating motion to generate compressed gas, and the compression cylinder 15 is arranged in the large base 6.

[0033] This technical solution may also include the following technical details to better achieve the technical effect: Figure 3 As shown, the compression connecting rod 11 is an 8-shaped structure, one end of which is sleeved on the outer ring of the first bearing 24 , and the other end of which is sleeved on the outer ring of the third bearing 12 .

[0034] This technical solution may also include the following technical details to better achieve the technical effect: Figure 2 As shown, the push assembly 2 includes a fourth bearing 17, a fifth bearing, a guide piston 18, a push cylinder 19, a push pin 20 and a cold storage component 21; the cold storage component 21 is located in the cold finger cylinder, and the cold storage and the cold finger cylinder are existing components and structures and will not be described in detail.

[0035] The push connecting rod 16 is a crescent-shaped connecting rod structure, one end of the push connecting rod 16 is connected to one end of the compression connecting rod 11 through the outer ring of the fourth bearing 17, and the other end of the push connecting rod 16 is installed on the outer ring of the fifth bearing. The push pin 20 is installed on the inner ring of the fifth bearing. The push pin 20 drives the guide piston 18 to reciprocate alternately. The guide piston 18 is arranged in a push cylinder 19 for its reciprocating motion to generate compressed gas. The cold storage component 21 is connected to the guide piston 18 to achieve synchronous movement.

[0036] In this embodiment, the central axis of the cylinder structure of the guide piston 18 of the push assembly 2 is deviated from the rotation axis of the rotating shaft 8 by the crescent-shaped connecting rod, and the eccentric crank structure on the push side can effectively reduce the lateral force of the push assembly 2, thereby reducing wear and improving reliability. Based on the above arrangement, on the one hand, part of the length of the push assembly 2 can be arranged in the large base 6, which effectively reduces the length of the push side of the refrigerator, making the structure more compact and smaller in size; on the other hand, the eccentric crank structure on the push side can also effectively reduce the lateral force of the push assembly 2, thereby reducing wear and improving reliability.

[0037] The technical solution may also include the following technical details to better achieve the technical effect: the compression cylinder 15 is connected to the push cylinder 19 through a gas channel, such as Figure 2 As shown, the gas passage is a large base inclined hole 26.

[0038] The present technical solution may also include the following technical details to better achieve the technical effect: it also includes a large base assembly 5, the large base assembly 5 includes a large base 6 and a deep groove ball bearing 7; the power assembly is installed on the large base 6 and the rotating shaft 8 of the power assembly penetrates into the large base 6 and is assembled on the inner ring of the deep groove ball bearing 7, and the outer ring of the deep groove ball bearing 7 is fixed on the large base 6.

[0039] The technical solution may also include the following technical details to better achieve the technical effect: the compression assembly, the push assembly and the power assembly are arranged at 90° to each other, and the compression assembly and parts of the push assembly are respectively located on both sides of the power assembly and are assembled in the large base. In this embodiment, the compression assembly 1, the push assembly 2 and the power assembly are arranged at 90° to each other. On the one hand, part of the length of the push assembly 2 can be placed in the large base 6, which effectively reduces the length of the push side of the refrigerator, making the structure more compact and smaller in size.

[0040] The technical solution may also include the following technical details to better achieve the technical effect: the power assembly includes a stator assembly 4 and a rotor assembly 3;

[0041] The stator assembly 4 includes a motor housing 22 and a motor stator 23 , and the rotor assembly 3 includes the rotating shaft 8 and a motor rotor 10 .

[0042] In this embodiment, the motor stator 23 includes a stator coil and a stator core, the motor rotor 10 includes a rotor core and a rotor coil, and the stator assembly 4 and the rotor assembly 3 form a motor to achieve conversion between electrical energy and mechanical energy, and transmission is completed through the rotating shaft 8.

[0043] The present technical solution may also include the following technical details to better achieve the technical effect: the rotor assembly 3 also includes a counterweight 9, and the counterweight 9 is arranged on the part of the rotating shaft 8 located on the large base 6. The counterweight 9 is used to balance the unbalanced force, which is a conventional setting of the refrigerator, and the specific structural form will not be repeated.

[0044] The technical solution may further include the following technical details to better achieve the technical effect: the stator assembly 4 and the rotor assembly 3 are coaxially arranged.

[0045] In this embodiment, the refrigerator working process is consistent with the existing rotary integral Stirling refrigerator. Working principle: the motor drives the rotating shaft 8 to rotate, and the eccentric wheel 25 of the rotating shaft 8 converts the rotary motion into the reciprocating motion of the compression piston 14 and the guide piston 18 and the cold storage component 21 through the first bearing 24, the compression connecting rod 11, the compression pin 13, etc., compresses the gas working medium in the compression chamber, and passes through the grooves of the corresponding positions of the compression cylinder 15, the inclined hole of the large base 6, the cold finger cylinder, the push cylinder 19, the guide piston 18 and other parts in turn, and enters the high-density porous medium structure in the cold storage component 21. Due to the positional relationship between the compression piston 14 and the guide piston 18, the expansion chamber volume is ahead of the compression chamber volume, so that the high-pressure gas working medium is compressed and releases heat at the hot end, and expands and absorbs heat at the cold end, achieving a refrigeration effect.

[0046] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A compact Stirling refrigerator, characterized in that: It includes a compression assembly, a push assembly and a power assembly; the power assembly has a rotating shaft, an eccentric wheel is arranged on the rotating shaft, the compression assembly is connected to the eccentric wheel through a compression connecting rod, and the rotational motion of the rotating shaft is converted into the reciprocating motion of the compression assembly; the push assembly is connected to the eccentric wheel through a crescent-shaped push connecting rod, and the rotational motion of the rotating shaft is converted into the reciprocating motion of the push assembly, and the movement axis of the push assembly deviates from the rotation axis of the rotating shaft; It also includes a large base assembly, which includes a large base and a deep groove ball bearing; the power assembly is installed on the large base, and the rotating shaft of the power assembly penetrates into the large base and is assembled on the deep groove ball bearing; The compression assembly, the push assembly and the power assembly are arranged at 90 degrees to each other, and parts of the compression assembly and the push assembly are respectively located on both sides of the power assembly and are assembled in the large base.

2. The compact Stirling refrigerator according to claim 1, characterized in that One end of the compression connecting rod is mounted on the eccentric wheel through a first bearing, and a third bearing is mounted on the other end of the compression connecting rod. The compression assembly includes a compression pin mounted on the inner ring of the third bearing and a compression piston driven by the compression pin and reciprocating alternately with the rotation of the rotating shaft. The compression piston is arranged in a compression cylinder for reciprocating motion to generate compressed gas.

3. The compact Stirling refrigerator according to claim 2, characterized in that: The compression connecting rod is an 8-shaped structure, one end of which is sleeved on the outer ring of the first bearing, and the other end of which is sleeved on the outer ring of the third bearing.

4. The compact Stirling refrigerator according to claim 2, characterized in that The push assembly includes a fourth bearing, a fifth bearing, a guide piston, a push cylinder, a push pin shaft and a cold storage component; One end of the push connecting rod is connected to one end of the compression connecting rod through the outer ring of the fourth bearing, and the other end of the push connecting rod is installed on the outer ring of the fifth bearing. The push pin is installed on the inner ring of the fifth bearing. The push pin drives the guide piston to move back and forth alternately. The guide piston is arranged in a push cylinder for its reciprocating motion to generate compressed gas. The cold storage component is connected to the guide piston to achieve synchronous movement.

5. The compact Stirling refrigerator according to claim 4, characterized in that The compression cylinder is communicated with the push cylinder through a gas channel.

6. The compact Stirling refrigerator according to claim 1, characterized in that The power assembly includes a stator assembly and a rotor assembly; The stator assembly includes a motor housing and a motor stator, and the rotor assembly includes the rotating shaft and a motor rotor.

7. The compact Stirling refrigerator according to claim 6, characterized in that The rotor assembly further comprises a counterweight block, which is arranged at the portion of the rotating shaft located at the large base, and is used to balance the unbalanced force.

8. The compact Stirling refrigerator according to claim 6, characterized in that The stator assembly is coaxially arranged with the rotor assembly.

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