Rotary Stirling refrigerator

Abstract

The utility model relates to a rotary Stirling cryocooler which comprises a base, a compression assembly, a pushing assembly, a motor rotor assembly and a motor stator assembly, the compression assembly, the pushing assembly and the motor stator assembly are all installed on the base, the motor stator assembly comprises a motor stator and a motor shell, and the motor stator and the motor shell are fixed. The motor rotor assembly comprises a motor rotor and a motor rotating shaft, the motor rotor and the motor rotating shaft are coaxially arranged and fixed, and the motor stator is arranged in the motor rotor. By adopting the design that the motor stator is internally arranged and the motor rotor is externally arranged, the strength and the stability of a shaft system are remarkably improved, a bearing with a higher specification can be selected, the dependence on a miniature bearing is reduced, the development difficulty of the refrigerating machine is reduced, and the overall performance and the long-term reliability of the refrigerating machine are further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of Stirling refrigerators, in particular to a rotary Stirling refrigerator. Background Art

[0002] In recent years, the rotary Stirling refrigerator has been widely used in many fields such as infrared detection, space detection and biomedicine due to its high integration and small size. This refrigerator is usually driven by a motor to achieve reciprocating linear motion of the compression piston and the push piston, thereby generating a pressure wave in the compression chamber, and heat exchange is carried out through the cold storage component to form a low-temperature environment.

[0003] However, the existing rotary Stirling refrigerator motor has an internal rotor and an external stator, and the axial and outer diameter dimensions of the refrigerator are often too large, which limits its applicability in applications that require a compact design. In addition, the shaft diameter of the shaft system is usually too small and uses miniature bearings. After a refrigerator of this design has been running for a period of time, a common failure is the wear and failure of the miniature bearings. This not only reduces the stability of the shaft system, but also may cause eccentric wear of the key friction parts of the refrigerator, leading to abnormal wear and jamming, affecting the long-term reliability and performance of the refrigerator. Utility Model Content

[0004] In view of the above defects of the prior art solutions, the main purpose of the present invention is to provide an improved rotary Stirling refrigerator design to solve the limitations and problems in the existing design and improve the performance and reliability of the refrigerator.

[0005] To achieve the above-mentioned purpose, the utility model provides a rotary Stirling refrigerator structure with a built-in motor stator, which can further improve the stability of the shaft system and the bearing capacity of the bearing, reduce the outer profile of the refrigerator, increase the long-term life of the refrigerator, and expand the application range and field of the detector.

[0006] The utility model discloses a rotary Stirling refrigerator, comprising a base, a compression assembly, a push assembly, a motor rotor assembly and a motor stator assembly, wherein the compression assembly, the push assembly and the motor stator assembly are all mounted on the base, the motor stator assembly comprises a motor stator and a motor housing, the motor stator is fixed to the motor housing, the motor rotor assembly comprises a motor rotor and a motor shaft, the motor rotor and the motor shaft are coaxially arranged and fixed, and the motor stator is built into the motor rotor.

[0007] Preferably, the motor shaft comprises a hollow shaft, the motor stator is located inside the hollow shaft, and the motor rotor is sleeved and fixed outside the hollow shaft.

[0008] Preferably, one end of the motor rotor is limited by a limiting portion provided on the hollow rotating shaft, and the other end is thread-locked by a flywheel provided on the hollow rotating shaft.

[0009] Preferably, the compression assembly includes a compression cylinder, a compression piston, a compression connecting rod and a compression transmission bearing, the compression piston is slidably located in the compression cylinder, and the compression connecting rod connects the compression piston and the compression transmission bearing, the pushing assembly includes a pushing cylinder, a pushing piston, a pushing connecting rod and a pushing transmission bearing, the pushing piston is slidably located in the pushing cylinder, and the pushing connecting rod connects the pushing piston and the pushing transmission bearing, the motor shaft includes an eccentric shaft, and the compression transmission bearing and the pushing transmission bearing are connected to the eccentric shaft.

[0010] Preferably, the compression connecting rod and the push connecting rod rotate with the eccentric wheel on the motor shaft to perform linear reciprocating motion, thereby realizing the linear reciprocating motion of the compression piston and the push piston.

[0011] Preferably, a receiving groove is formed in a recessed manner on the top of the motor housing, and the motor stator is placed in the receiving groove and fixed to the receiving groove.

[0012] Preferably, the inner wall of the accommodating groove is provided with a limiting protrusion, the outer wall of the motor stator is provided with a groove matching with the limiting protrusion, and the motor stator is bonded and fixed to the accommodating groove.

[0013] Preferably, the motor stator assembly further comprises a connector, the connector is welded to the motor housing, and the motor stator lead wire is welded to the connector.

[0014] Preferably, the motor rotor assembly also includes an upper support bearing and a lower support bearing, the outer ring of the upper support bearing is fixed to the motor housing, and the inner ring is fixed to the motor shaft, the upper support bearing and the motor shaft adopt an interference fit, the outer ring of the lower support bearing is fixed to the base, and the inner ring is fixed to the motor shaft.

[0015] Preferably, the base and the motor housing are sealed by a sealing ring.

[0016] In summary, the beneficial effects of the utility model are as follows: the design of internal motor stator and external motor rotor, combined with the use of hollow shaft, significantly increases the strength and stability of the shaft system, and can select higher specification bearings, reducing the dependence on miniature bearings, reducing the difficulty of refrigerator development, while improving the bearing capacity, further enhancing the overall performance and long-term reliability of the refrigerator. The internal motor stator uses the motor housing to achieve the support of the motor stator, the sealing of the refrigerator, and the transmission integration of the bearing, effectively reducing the outer contour of the refrigerator. This integrated design not only saves space, but also simplifies the overall structure of the refrigerator, making it more suitable for applications with limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a cross-sectional schematic diagram of a rotary Stirling refrigerator and a compression assembly according to an embodiment of the utility model;

[0019] Figure 2 It is a cross-sectional schematic diagram of a rotary Stirling refrigerator and a push assembly according to an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of a motor shaft of a rotary Stirling refrigerator according to an embodiment of the utility model;

[0021] Figure 4 It is a partial schematic diagram of the motor rotor assembly of the rotary Stirling refrigerator of the embodiment of the utility model;

[0022] Figure 5 A schematic diagram of a motor housing of a rotary Stirling refrigerator according to an embodiment of the utility model;

[0023] Explanation of the reference numerals: 1-compression cylinder, 2-compression piston, 3-compression connecting rod, 4-compression transmission bearing, 5-motor housing, 51-limiting protrusion, 6-motor rotor, 7-upper support bearing, 8-connector, 9-motor stator, 10-motor shaft, 101-hollow shaft, 102-limiting part, 103-eccentric shaft, 104-fixed shaft, 11-flywheel, 12-lower support bearing, 13-base, 14-push transmission bearing, 15-push connecting rod, 16-push cylinder, 17-push piston. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model belong to the utility model.

[0025] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0026] See also Figure 1-2 The present embodiment provides a rotary Stirling refrigerator, which includes a base 13, a compression assembly, a push assembly, a motor rotor assembly and a motor stator assembly, wherein the compression assembly, the push assembly and the motor stator assembly are all installed on the base, the motor stator assembly includes a motor stator 9 and a motor housing 5, the motor stator 9 is fixed to the motor housing 5, the motor rotor assembly includes a motor rotor 6 and a motor shaft 10, the motor rotor 6 and the motor shaft 10 are coaxially arranged and fixed, and the motor stator 9 is built into the motor rotor 6.

[0027] The combination of the internal design of the motor stator 9 and the external design of the motor rotor 6 makes the entire motor unit more stable and efficient during operation. This design also reduces the size of the refrigerator, making it more suitable for environments with limited space.

[0028] See also Figure 3-4 The motor shaft 10 includes a hollow shaft 101, the motor stator 9 is located inside the hollow shaft 101, and the motor rotor 6 is sleeved and fixed outside the hollow shaft 101. The use of such a shaft not only reduces the weight of the shaft, but also enhances the structural strength and stability of the shaft. In addition, the motor rotor 6 is externally disposed on the motor shaft 10, one end of the motor rotor 6 is limited by a limiter 102 provided on the hollow shaft 101, and the other end is threadedly locked by a flywheel 11 provided on the hollow shaft 101. This design allows the motor rotor 6 to rotate stably on the shaft, and the use of the flywheel 11 further improves the dynamic balance of the motor rotor 6, and enhances the operating efficiency and stability of the entire system.

[0029] In addition, the compression assembly and the push assembly are important components of the rotary Stirling refrigerator, and together complete the key steps of the refrigeration cycle. The compression assembly includes a compression cylinder 1, a compression piston 2, a compression connecting rod 3 and a compression transmission bearing 4. The compression piston 2 slides in the compression cylinder 1, and the compression connecting rod 1 connects the compression piston 2 and the compression transmission bearing 4. The compression piston 2 reciprocates in the compression cylinder 1 and is connected to the compression transmission bearing 4 through the compression connecting rod 3, ensuring the smoothness and efficiency of the movement. This process is crucial for heat exchange in the refrigeration cycle. The push assembly includes a push cylinder 16, a push piston 17, a push connecting rod 15 and a push transmission bearing 14. Similar to the compression assembly, the push piston 17 slides in the push cylinder 16, and the push connecting rod 15 connects the push piston 17 and the push transmission bearing 14. The design of the push assembly ensures the precise reciprocating motion of the piston, thereby effectively managing the flow and pressure changes of the fluid in the push cylinder and providing power for the refrigeration process. The motor shaft 10 includes an eccentric shaft 103, which is connected to the hollow shaft 101 and is preferably integrally formed. The eccentric shaft 103 is eccentrically arranged relative to the hollow shaft 101. The compression drive bearing 4 and the push drive bearing 14 are connected to the eccentric shaft 103. This connection method ensures efficient transmission of power and reduces energy loss.

[0030] The movement of the motor rotor 6 directly affects the efficiency and performance of the compression piston 2 and the push piston 17. The compression connecting rod 3 and the push connecting rod 15 rotate with the eccentric wheel on the motor shaft 10 to perform linear reciprocating motion, thereby realizing the linear reciprocating motion of the compression piston and the push piston. This mechanism effectively converts the rotational power of the motor into the linear motion of the piston, thereby improving the efficiency and reliability of the overall refrigeration cycle.

[0031] See also Figure 5 In some embodiments, in order to ensure the stability of the motor stator 9 and the long-term reliable operation of the motor, a receiving groove is formed on the top of the motor housing 5, and the motor stator 9 is placed in the receiving groove and fixed to the receiving groove. The inner wall of the receiving groove is provided with a limiting protrusion 51, and the outer wall of the motor stator 9 is provided with a groove that matches the limiting protrusion 51. The motor stator 9 is bonded and fixed to the receiving groove. The motor stator 9 can be bonded and fixed to the motor housing 5 by special glue. This bonding method not only provides a solid structural support, but also helps to prevent displacement caused by vibration or long-term use. The motor stator assembly also includes a key connector 8. The design of this connector 8 takes into account the easy connection and maintenance of the motor lead wire. The connector 8 and the motor housing 5 are tightly connected by welding to ensure the stability and sealing of the electrical connection. In order to realize the electrical connection between the motor stator 9 and other parts of the refrigerator, the motor stator lead wire is welded to the connector 8. This welding connection method not only provides reliable electrical transmission, but also simplifies the assembly and maintenance process, while enhancing the durability and safety of the overall device.

[0032] In some embodiments, the motor rotor assembly further includes an upper support bearing 7 and a lower support bearing 12, the outer ring of the upper support bearing 7 is fixed to the motor housing 5, and the inner ring is fixed to the motor shaft 10. The upper support bearing 7 and the motor shaft 10 adopt an interference fit, which ensures a tight connection between the shaft and the bearing, improves the operating stability of the entire device, and the precise design of the interference fit allows the shaft to maintain stable rotation inside the bearing, while reducing friction and wear, and extending the service life of the refrigerator. The outer ring of the lower support bearing 12 is fixed to the base 13, and the inner ring is fixed to the fixed shaft 104 of the motor shaft 10.

[0033] In addition, in order to protect the motor stator assembly from the influence of the external environment, the base 13 and the motor housing 5 are sealed by a sealing ring, which not only prevents the invasion of dust and moisture, but also helps maintain the temperature of the stator and the stability of the working environment, thereby ensuring the efficient operation and long-term stability of the motor.

[0034] The rotary Stirling refrigerator provided by the utility model adopts a built-in design of the motor stator, which significantly improves the shaft stability and bearing capacity of the refrigerator, while achieving a more compact appearance. This innovative structure not only extends the long-term life of the refrigerator, but also expands its application range in various high-precision detector fields, providing a high-efficiency and highly reliable refrigeration solution.

[0035] The above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0036] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A rotary Stirling refrigerator, comprising a base, a compression assembly, a push assembly, a motor rotor assembly and a motor stator assembly, wherein the compression assembly, the push assembly and the motor stator assembly are all mounted on the base, characterized in that: The motor stator assembly includes a motor stator and a motor housing, the motor stator is fixed to the motor housing, the motor rotor assembly includes a motor rotor and a motor shaft, the motor rotor and the motor shaft are coaxially arranged and fixed, and the motor stator is built into the motor rotor.

2. The rotary Stirling refrigerator according to claim 1, characterized in that: The motor shaft comprises a hollow shaft, the motor stator is located inside the hollow shaft, and the motor rotor is sleeved and fixed outside the hollow shaft.

3. The rotary Stirling refrigerator according to claim 2, characterized in that: One end of the motor rotor is limited by a limiting portion arranged on the hollow rotating shaft, and the other end is thread-locked by a flywheel arranged on the hollow rotating shaft.

4. The rotary Stirling refrigerator according to claim 1, characterized in that: The compression assembly includes a compression cylinder, a compression piston, a compression connecting rod and a compression transmission bearing. The compression piston slides in the compression cylinder, and the compression connecting rod connects the compression piston and the compression transmission bearing. The push assembly includes a push cylinder, a push piston, a push connecting rod and a push transmission bearing. The push piston slides in the push cylinder, and the push connecting rod connects the push piston and the push transmission bearing. The motor shaft includes an eccentric shaft, and the compression transmission bearing and the push transmission bearing are connected to the eccentric shaft.

5. The rotary Stirling refrigerator according to claim 4, characterized in that: The compression connecting rod and the push connecting rod rotate with the eccentric wheel on the motor shaft to perform linear reciprocating motion, thereby realizing the linear reciprocating motion of the compression piston and the push piston.

6. The rotary Stirling refrigerator according to claim 1, characterized in that: The top of the motor housing is concavely provided with a receiving groove, and the motor stator is placed in the receiving groove and fixed to the receiving groove.

7. The rotary Stirling refrigerator according to claim 6, characterized in that: The inner wall of the containing groove is provided with a limiting protrusion, the outer wall of the motor stator is provided with a groove matched with the limiting protrusion, and the motor stator is bonded and fixed to the containing groove.

8. The rotary Stirling refrigerator according to claim 1, characterized in that: The motor stator assembly also includes a connector, which is welded to the motor housing, and the motor stator lead wire is welded to the connector.

9. The rotary Stirling refrigerator according to claim 1, characterized in that: The motor rotor assembly also includes an upper support bearing and a lower support bearing. The outer ring of the upper support bearing is fixed to the motor housing, and the inner ring is fixed to the motor shaft. The upper support bearing and the motor shaft are interference fit. The outer ring of the lower support bearing is fixed to the base, and the inner ring is fixed to the motor shaft.

10. The rotary Stirling refrigerator according to claim 1, characterized in that: The base and the motor housing are sealed by a sealing ring.

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