CN116771875A - Refrigerator transmission assembly and rotary Stirling refrigerator - Google Patents

Abstract

The application discloses a refrigerator transmission assembly and a rotary Stirling refrigerator, which relate to the technical field of refrigeration equipment. The refrigerator transmission assembly includes a transmission crankshaft, a compression connecting rod and an expansion connecting rod; the compression connecting rod and the expansion connecting rod are wound around Circumferential distribution of the transmission crankshaft; one end of the compression connecting rod is used to connect with the compression piston of the compression mechanism without relative motion, and the other end is in line contact with the outer peripheral surface of the transmission crankshaft; one end of the expansion connecting rod is used to connect with the expansion piston of the expansion mechanism without relative motion , the other end is in line contact with the outer peripheral surface of the transmission crankshaft; the transmission crankshaft is used to drive the compression connecting rod and the expansion connecting rod to reciprocate when it rotates. This design achieves the reduction of at least four bearings, which not only reduces production costs and improves production efficiency, but also effectively solves the problem of restricting the life of the refrigerator due to bearing life, effectively extending the service life of the refrigerator.

Description

A refrigerator transmission component and a rotary Stirling refrigerator

Technical field

The present application relates to the technical field of refrigeration equipment, and in particular to a refrigerator transmission assembly and a rotary Stirling refrigerator.

Background technique

Stirling cycle refrigerator is a recuperative gas refrigerator. An important structural feature of it is that there is no need for valves between the compressor and the expander. The compressor and expander operate at the same high efficiency. The system The change pattern of internal pressure is determined by the correlation of various internal parameters. The advantages of this type of refrigerator are compact structure and high efficiency. It is widely used in the fields of high-temperature superconducting and infrared detection.

The Stirling refrigerator integrates the compression part (including compression cylinder, compression piston and cooler) with the expansion refrigeration part (including expansion cylinder, ejector, regenerator and cold heat exchanger), and is connected through a crankshaft or other The power mechanism is coupled to form an independently operating refrigerator. There is an important difference between the compression piston and the ejector (also called expansion piston or displacement piston) in a Stirling refrigerator. The compression piston is used to compress gas. It is a mechanism that withstands high pressure and must have a high-pressure sealing device. The ejector is a free piston that withstands a large temperature difference. The pressure at both ends is approximately the same. It has low requirements for cylinder sealing and high requirements for axial heat insulation. Therefore, the ejector is a component with light weight and low thermal conductivity.

Rotary Stirling refrigerators are widely used in Stirling cycle refrigeration equipment. However, the service life of rotary Stirling refrigerators is relatively low. The MTTF (mean time to failure) is about 10,000 hours. Its service life is mainly Subject to the following factors:

1. Wear failure mainly refers to bearing wear, compression piston wear, ejector wear, etc.;

2. Working fluid gas leakage, mainly refers to the leakage of high-pressure helium gas in the refrigerator cavity;

3. Gas pollution mainly refers to the outgassing of various parts and materials in the refrigerator cavity;

4. Solid pollution mainly refers to the wear and tear between moving parts in the wall of the refrigerator;

Among the above factors, wear and tear failure is the most important factor leading to the short service life of rotary Stirling refrigerators.

After research, it was found that the rotating pairs in the existing rotary Stirling refrigerators are all connected through bearings. However, the bearing is a complex mechanical product. It is not only expensive, but also has a complicated assembly process, which reduces operating efficiency. The quality of bearings from different manufacturers varies, and it takes a lot of time to select qualified bearing products. This makes bearing life one of the important factors affecting wear and failure, and it is also one of the most important factors restricting the life of the refrigerator.

Therefore, providing a rotary Stirling refrigerator that uses less or no bearings is an urgent problem that those skilled in the art need to solve.

Contents of the invention

In view of this, the purpose of this application is to provide a refrigerator transmission assembly and a rotary Stirling refrigerator to solve the technical problem of the relatively low service life of the existing rotary Stirling refrigerator.

In order to achieve the above technical objectives, this application provides a refrigerator transmission assembly, including a transmission crankshaft, a compression connecting rod and an expansion connecting rod;

The compression connecting rod and the expansion connecting rod are circumferentially distributed around the transmission crankshaft;

One end of the compression connecting rod is used to connect with the compression piston of the compression mechanism without relative motion, and the other end is in line contact with the outer peripheral surface of the transmission crankshaft;

One end of the expansion connecting rod is used to connect with the expansion piston of the expansion mechanism without relative motion, and the other end is in line contact with the outer peripheral surface of the transmission crankshaft;

The transmission crankshaft is used to drive the compression connecting rod and the expansion connecting rod to reciprocate when it rotates.

Further, the transmission crankshaft includes a shaft and an eccentric sleeve;

The eccentric sleeve is sleeved on the shaft;

The other end of the compression connecting rod is in line contact with the outer peripheral surface of the eccentric sleeve;

The other end of the expansion connecting rod is in line contact with the outer peripheral surface of the eccentric sleeve.

Further, the transmission crankshaft also includes a balance weight;

The balance weight is installed on the shaft.

Further, one end of the compression connecting rod is connected to the compression piston through a first connecting pin without relative motion.

Further, one end of the compression connecting rod is provided with a first pin hole that runs through itself and for the first connecting pin to pass through;

One end of the compression piston is provided with a first installation groove into which one end of the compression connecting rod extends;

The compression piston is provided with a second pin hole that penetrates the first installation groove and corresponds to the first pin hole, and for the first connecting pin to pass through.

Further, the other end of the compression connecting rod is provided with a first arc surface in line contact with the outer peripheral surface of the transmission crankshaft;

The roughness value of the first arc surface is ≤0.4 μm.

Further, one end of the expansion connecting rod is connected to the expansion piston through a second connecting pin without relative movement.

Further, one end of the expansion connecting rod is provided with a third pin hole that runs through itself and for the second connecting pin to pass through;

One end of the expansion piston is provided with a second installation groove into which one end of the expansion connecting rod extends;

The expansion piston is provided with a fourth pin hole that penetrates the second installation groove and corresponds to the third pin hole, and for the second connecting pin to pass through.

Further, the other end of the expansion connecting rod is provided with a second arc surface in line contact with the outer peripheral surface of the transmission crankshaft;

The roughness value of the second arc surface is ≤0.4 μm.

This application also discloses a rotary Stirling refrigerator, including the above-mentioned refrigerator transmission assembly.

It can be seen from the above technical solution that the refrigerator transmission assembly designed in this application is designed with a compression connecting rod to realize the transmission connection between the transmission crankshaft and the compression mechanism. The compression connecting rod and the transmission crankshaft adopt a line contact design. It is connected to the compression piston of the compression mechanism without relative motion; an expansion connecting rod is also designed to realize the transmission connection between the transmission crankshaft and the expansion mechanism. The expansion connecting rod adopts a line contact design with the transmission crankshaft and is connected with the expansion mechanism. The expansion pistons are connected without relative motion; the above transmission connection design method replaces the traditional design method of being sleeved outside the transmission crankshaft, which not only reduces the number of connections between the compression connecting rod, expansion connecting rod and transmission crankshaft Bearings are also reduced. The bearings used to connect the compression connecting rod and the compression mechanism and the bearings used to connect the expansion connecting rod and the expansion mechanism are reduced to at least four bearings, which not only reduces the rotational pressure of the assembly. The production cost of Stirling refrigerator is improved, the production efficiency is improved, and the problem of restricting the life of the refrigerator due to bearing life is well solved, effectively improving the service life of the rotary Stirling refrigerator prepared by this component.

Description of drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a perspective view of a refrigerator transmission assembly provided in this application;

Figure 2 is a front view of a refrigerator transmission assembly provided in this application;

In the picture: 1. Transmission crankshaft; 11. Shaft rod; 12. Eccentric sleeve; 13. Balance weight; 2. Compression connecting rod; 21. First arc surface; 22. First pin hole; 23. First connecting pin ;3. Expansion connecting rod; 31. Second arc surface; 32. Third pin hole; 33. Second connecting pin; 4. Compression piston; 41. First mounting groove; 42. Second pin hole; 5. Expansion Piston; 51, second mounting groove; 52, fourth pin hole.

Detailed ways

The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the examples in the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the embodiments of this application.

In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by "" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation. It is constructed and operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. Replaceable connections, or integral connections, can be mechanical connections or electrical connections, direct connections, indirect connections through an intermediary, or internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood in specific situations.

The embodiment of the present application discloses a refrigerator transmission assembly.

Please refer to Figure 1. An embodiment of a refrigerator transmission assembly provided in the embodiment of the present application includes:

Transmission crankshaft 1, compression connecting rod 2 and expansion connecting rod 3; compression connecting rod 2 and expansion connecting rod 3 are distributed around the circumference of transmission crankshaft 1, and the angle between compression connecting rod 2 and expansion connecting rod 3 is any angle, that is The axial projection angle of the compression connecting rod 2 and the expansion connecting rod 3 on the transmission crankshaft 1 is any angle.

One end of the compression connecting rod 2 is used to connect with the compression piston 4 of the compression mechanism without relative movement. That is, the compression connecting rod 2 and the compression piston 4 are fixedly assembled and cannot move relative to each other, thereby saving the space between the compression connecting rod 2 and the compression piston 4. The bearing used for connecting the compression pistons 4 reduces the assembly process; the other end of the compression connecting rod 2 is in line contact with the outer peripheral surface of the transmission crankshaft 1. Compared with the traditional sleeve setting method, the line contact design method ensures that the transmission crankshaft 1 is connected to the compression connection. The transmission cooperation between the rods 2 can reduce the number of bearings used for connection between the compression connecting rod 2 and the transmission crankshaft 1 and reduce the assembly process.

In the same way, one end of the expansion connecting rod 3 is used to connect with the expansion piston 5 of the expansion mechanism without relative movement. That is, the expansion connecting rod 3 and the expansion piston 5 are fixedly assembled and cannot move relative to each other, thereby saving the expansion connection. The bearing used to connect the rod 3 and the expansion piston 5 reduces the assembly process; the other end of the expansion connecting rod 3 is in line contact with the outer peripheral surface of the transmission crankshaft 1. Compared with the traditional sleeve setting method, the line contact design method ensures that the transmission crankshaft 1 At the same time as the transmission cooperation between the expansion connecting rod 3, the number of bearings used for connection between the expansion connecting rod 3 and the transmission crankshaft 1 can be reduced, and the assembly process can be reduced.

The transmission crankshaft 1 is used to drive the compression connecting rod 2 and the expansion connecting rod 3 to reciprocate when it rotates.

By using the above transmission connection design method to replace the traditional design method that is sleeved outside the transmission crankshaft 1, not only the number of bearings used to connect the compression connecting rod 2, the expansion connecting rod 3 and the transmission crankshaft 1 is reduced, but also the number of compression connecting rods is reduced. The bearings used to connect 2 to the compression mechanism and the bearings used to connect the expansion connecting rod 3 to the expansion mechanism can be reduced by at least four bearings, which not only reduces the production cost of the rotary Stirling refrigerator prepared by this component , improves production efficiency, and also solves the problem of restricting the life of the refrigerator due to bearing life, effectively improving the service life of the rotary Stirling refrigerator prepared by this component.

The above is the first embodiment of a refrigerator transmission assembly provided by the embodiment of the present application. The following is the second embodiment of a refrigerator transmission assembly provided by the embodiment of the present application. Please refer to Figures 1 to 2 for details.

Solution based on the above-mentioned Embodiment 1:

Furthermore, in terms of design, the transmission crankshaft 1 includes a shaft 11 and an eccentric sleeve 12 .

The eccentric sleeve 12 is sleeved on the shaft 11 . The eccentric sleeve 12 has a cylindrical structure, and the matching cavity for the shaft 11 to pass through is eccentrically arranged, thereby forming the eccentric sleeve 12 .

Correspondingly, the other end of the compression connecting rod 2 is in line contact with the outer peripheral surface of the eccentric sleeve 12 , and the other end of the expansion connecting rod 3 is in linear contact with the outer peripheral surface of the eccentric sleeve 12 . In addition, in this application, the distance between the other end of the compression connecting rod 2 and one end surface of the eccentric sleeve 12 is equal to the distance between the other end of the expansion connecting rod 3 and one end surface of the eccentric sleeve 12, that is, The compression connecting rod 2 and the expansion connecting rod 3 are aligned in the axial direction of the shaft 11 instead of being offset front and back along the axial direction.

Furthermore, in order to make the rotation of the transmission crankshaft 1 more stable, a balance weight 13 is also included. The balance weight 13 is installed on the shaft 11. Specifically, the design can be made with reference to the existing crankshaft or used without limitation.

Furthermore, one end of the compression connecting rod 2 can be connected to the compression piston 4 through the first connecting pin 23 without relative motion, that is, it can be fixedly assembled with the compression piston 4 through the first connecting pin 23 .

Specifically, one end of the compression connecting rod 2 can be provided with a first pin hole 22 that runs through itself and allows the first connecting pin 23 to pass through it. One end of the compression connecting rod 2 can be in the shape of an annular ring, and its inner hole can also be The first pin hole 22 is formed.

One end of the compression piston 4 is provided with a first mounting groove 41 into which one end of the compression connecting rod 2 extends. The first mounting groove 41 may be an inner groove, and is not specifically limited. The compression piston 4 is provided with a second pin hole 42 that penetrates the first mounting groove 41 and corresponds to the first pin hole 22 for the first connecting pin 23 to pass through.

Furthermore, in order to achieve line contact fit, the other end of the compression connecting rod 2 is provided with a first arc surface 21 that is in line contact with the outer peripheral surface of the transmission crankshaft 1. Specifically, the other end of the compression connecting rod 2 can be designed to be cylindrical. , its outer peripheral surface also forms the first arc surface 21.

In order to ensure smooth line contact, the roughness value of the first arc surface 21 is designed to be ≤0.4 μm.

Furthermore, in the same way, one end of the expansion connecting rod 3 can be connected to the expansion piston 5 through a second connecting pin 33 without relative movement.

Specifically, one end of the expansion connecting rod 3 can be provided with a third pin hole 32 that runs through itself and allows the second connecting pin 33 to pass through; one end of the expansion connecting rod 3 can be in the shape of a ring, and its inner hole can also be The second pin hole 42 is formed.

One end of the expansion piston 5 is provided with a second installation groove 51 into which one end of the expansion connecting rod 3 extends; the second installation groove 51 may be a U-shaped open groove, and is not specifically limited. The expansion piston 5 is provided with a fourth pin hole 52 that penetrates the second installation groove 51 and corresponds to the third pin hole 32 for the second connecting pin 33 to pass through.

Further, in order to achieve line contact matching, the other end of the expansion connecting rod 3 is provided with a second arc surface 31 that is in line contact with the outer peripheral surface of the transmission crankshaft 1; specifically, the other end of the expansion connecting rod 3 can be designed to be cylindrical, Its outer peripheral surface also forms a second arc surface 31 .

In order to ensure smooth line contact, the roughness value of the second arc surface 31 is designed to be ≤0.4 μm.

This application also discloses a rotary Stirling refrigerator, including a compression mechanism, an expansion mechanism, and the refrigerator transmission assembly of the above-mentioned Embodiment 1 or 2.

The transmission crankshaft 1 is driven by the motor to rotate. Driven by the rotation of the transmission crankshaft 1, the compression connecting rod 2 is driven to reciprocate in a linear manner. The compression connecting rod 2 drives the compression piston 4 to reciprocate in a linear manner through the first connecting pin 23, thereby causing the compression piston to reciprocate in a linear manner. 4. Perform compression movement in the compression cylinder to perform the refrigeration work of the Stirling refrigerator.

Correspondingly, driven by the rotation of the transmission crankshaft 1, the expansion connecting rod 3 is driven to reciprocate linearly, and the expansion connecting rod 3 drives the expansion piston 5 to reciprocate linearly through the second connecting pin 33, thereby causing the expansion piston 5 to move in the expansion cylinder. Expansion motion to perform the refrigeration work of the Stirling refrigerator.

The above is a detailed introduction to a refrigerator transmission assembly and a rotary Stirling refrigerator provided by the present application. For those of ordinary skill in the art, based on the ideas of the embodiments of the present application, both in terms of specific implementation and application scope There will be changes. In summary, the contents of this specification should not be construed as a limitation on this application.

Claims (10)

1. The transmission assembly of the refrigerator is characterized by comprising a transmission crankshaft (1), a compression connecting rod (2) and an expansion connecting rod (3);

the compression connecting rod (2) and the expansion connecting rod (3) are circumferentially distributed around the transmission crankshaft (1);

one end of the compression connecting rod (2) is connected with a compression piston (4) of the compression mechanism in a non-relative motion way, and the other end of the compression connecting rod is in line contact with the peripheral surface of the transmission crankshaft (1);

one end of the expansion connecting rod (3) is connected with an expansion piston (5) of the expansion mechanism in a non-relative motion way, and the other end of the expansion connecting rod is in line contact with the peripheral surface of the transmission crankshaft (1);

the transmission crankshaft (1) is used for driving the compression connecting rod (2) and the expansion connecting rod (3) to reciprocate when the transmission crankshaft is in rotation.

2. A refrigerator transmission assembly according to claim 1, characterized in that the transmission crankshaft (1) comprises a shaft (11) and an eccentric sleeve (12);

the eccentric sleeve (12) is sleeved on the shaft rod (11);

the other end of the compression connecting rod (2) is in line contact with the outer peripheral surface of the eccentric sleeve (12);

the other end of the expansion connecting rod (3) is in line contact with the outer peripheral surface of the eccentric sleeve (12).

3. A refrigerator transmission assembly according to claim 2, characterized in that the transmission crankshaft (1) further comprises a counterweight (13);

the balance weight (13) is mounted on the shaft lever (11).

4. A refrigerator transmission assembly according to claim 1, characterized in that one end of the compression link (2) is connected to the compression piston (4) by a first connecting pin (23) without relative movement.

5. A refrigerator transmission assembly according to claim 4, characterized in that one end of the compression link (2) is provided with a first pin hole (22) which penetrates itself and through which the first connecting pin (23) passes;

one end of the compression piston (4) is provided with a first mounting groove (41) into which one end of the compression connecting rod (2) extends;

the compression piston (4) is provided with a second pin hole (42) penetrating through the first mounting groove (41) and corresponding to the first pin hole (22) and allowing the first connecting pin (23) to pass through.

6. A refrigerator transmission assembly according to claim 1, characterized in that the other end of the compression connecting rod (2) is provided with a first cambered surface (21) in line contact with the outer circumferential surface of the transmission crankshaft (1);

the roughness value of the first cambered surface (21) is less than or equal to 0.4 mu m.

7. A refrigerator transmission assembly according to claim 1, characterized in that one end of the expansion link (3) is connected to the expansion piston (5) by means of a second connecting pin (33) without relative movement.

8. A refrigerator transmission assembly according to claim 7, characterized in that one end of the expansion link (3) is provided with a third pin hole (32) passing through itself and through which the second connecting pin (33) passes;

one end of the expansion piston (5) is provided with a second mounting groove (51) into which one end of the expansion connecting rod (3) extends;

the expansion piston (5) is provided with a fourth pin hole (52) penetrating through the second mounting groove (51) and corresponding to the third pin hole (32) and allowing the second connecting pin (33) to pass through.

9. A refrigerator transmission assembly according to claim 1, wherein the other end of the expansion link (3) is provided with a second cambered surface (31) in line contact with the outer peripheral surface of the transmission crankshaft (1);

the roughness value of the second cambered surface (31) is less than or equal to 0.4 mu m.

10. A rotary stirling cooler comprising a cooler drive assembly according to any one of claims 1 to 9.