Compression assembly and Stirling refrigerator

Abstract

The utility model relates to a compression assembly and a Stirling cryocooler using the same, and the compression assembly comprises a compression piston which reciprocates in a through groove of a compression cylinder; a plurality of channel holes are distributed in the compression piston, and a storage groove communicated with the channel holes is formed in the compression piston. By the adoption of the structural design, coating powder falling in the movement process of a friction pair of the Stirling cryocooler can be effectively collected, the influence of the coating powder on moving parts is avoided to a large extent, and the reliability of the cryocooler is improved.

Description

Technical Field

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

[0002] Stirling refrigerator is a kind of mechanical refrigerator with in-depth research, wide application, mature development and many variants among small low-temperature refrigerators. It has the characteristics of compact structure, wide operating temperature range, fast start-up, high efficiency and easy operation. Rotary Stirling refrigerator is widely used in infrared refrigeration detectors due to its compact structure, small size and light weight. The compression piston and compression cylinder of the rotary Stirling refrigerator are a pair of oil-free and lubricated kinematic pairs. The clearance between the two is at the micron level. The surface of the compression piston is generally DLC coated, and it performs linear reciprocating motion in the compression cylinder.

[0003] The application of existing rotary Stirling refrigerators is relatively mature, but since the compression pistons are mostly DLC coated, when running for a long time, the DLC coating of the compression pistons will fall off due to the inevitable stress. The detached coating fragments and powder are stuck in the middle of the friction pair or inside the bearing, which can easily cause movement jamming, thereby causing the rotary Stirling refrigerator to jam early, thereby affecting the imaging life of the detector. Utility Model Content

[0004] In view of the above defects or improvements required in the prior art solutions, the main purpose of the present invention is to propose a compression component and a Stirling refrigerator using the same. The compression component includes a structure that can absorb coating powder, so as to collect the detached coating powder and further improve the service life and reliability of the rotary Stirling refrigerator.

[0005] To achieve the above objectives, in a first aspect, the utility model discloses a compression assembly, including a compression piston, which reciprocates in a through groove of a compression cylinder; the compression piston is provided with a plurality of channel holes and a storage groove connected to the channel holes is provided inside the compression piston.

[0006] Preferably, the channel hole penetrates the wall surface of the compression piston and further includes an inner retaining ring which is interference fit with the inner wall of the compression piston to form at least one closed storage groove between the inner wall of the compression piston.

[0007] Preferably, the channel holes are arranged in a plurality of circles along the circumference of the compression piston, and the inner retaining ring includes a plurality of inner retaining rings, each of the inner retaining rings corresponding to a circle of the channel holes.

[0008] Preferably, the channel hole includes two circles, which are respectively located at two ends of the compression piston, and the inner retaining ring includes a first inner retaining ring and a second inner retaining ring, which respectively correspond to the two circles of channel holes, thereby forming two storage grooves.

[0009] Preferably, a groove or a step surface is provided on the inner wall of the compression piston and / or the inner retaining ring facing the channel hole to form a closed storage groove.

[0010] Preferably, the compression piston surface is provided with an annular groove, and the channel hole is located in the groove.

[0011] Preferably, the channel holes have a diameter of 0.3-0.8 mm and are evenly distributed around the circumference.

[0012] Preferably, it also includes a compression pin, which is transversely arranged in the inner cavity of the compression piston; a compression connecting rod, whose lower end is connected to the compression pin and whose upper end extends out of the compression cylinder; and a stabilizing compression spring, which is mounted on the compression connecting rod in a compressed state and whose lower end is against the compression pin.

[0013] Preferably, a needle bearing is interference-connected at the lower end of the compression connecting rod, and the needle bearing is arranged in the middle of the compression pin.

[0014] In a second aspect, the utility model further discloses a Stirling refrigerator, comprising a motor and the above-mentioned compression assembly, wherein the motor is connected to the compression piston to provide power for the compression piston to reciprocate in the through groove of the compression cylinder.

[0015] The beneficial effects of the utility model are as follows: without changing the overall structure of the refrigerator, a structure capable of absorbing coating powder is designed on the compression piston of the compression component; fine collecting channel holes are evenly distributed on the surface of the compression piston; the structure is simple, and does not affect the assembly gap between the internal parts of the compression component; when the friction pair moves, the coating powder that continuously falls off the surface of the compression piston can be captured and guided into the internal storage tank in time, effectively avoiding the accumulation of coating powder on the surface of the friction pair, preventing the possibility of further invading the bearing and the expansion chamber, avoiding the jamming or even jamming of the friction pair and the bearing, thereby ensuring the operating performance of the refrigerator and extending the service life of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a cross-sectional schematic diagram of a compression assembly according to an embodiment of the utility model;

[0018] Figure 2Schematic diagram of the assembly of the compression piston and the inner retaining ring of the embodiment of the utility model

[0019] Figure 3 This is a schematic diagram of the compression piston structure of an embodiment of the utility model;

[0020] Figure 4 Another schematic diagram of the compression piston structure of an embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of a compression piston coating collection channel hole according to an embodiment of the utility model;

[0022] Explanation of the reference numerals: 1-compression piston, 2-compression pin, 3-compression connecting rod, 4-stabilizing compression spring, 5-channel hole, 6-storage groove, 7-annular groove, 8-first inner retaining ring, 9-second inner retaining ring, 10-needle bearing, 11-deep groove ball bearing. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] See also Figure 1-2 The present embodiment provides a compression assembly, which is designed to improve the operating reliability of the refrigerator and prevent internal parts from getting stuck. The compression assembly specifically includes a compression piston 1 that reciprocates in a through groove of a compression cylinder; a plurality of channel holes 5 are distributed on the compression piston 1, and a storage groove 6 connected to the channel holes 5 is provided inside the compression piston 1.

[0026] A plurality of channel holes 5 are distributed on the compression piston 1 for collecting and transferring coating powders. The channel holes 5 penetrate the wall of the compression piston 2. The compression assembly also includes an inner retaining ring, which is interference fit with the inner wall of the compression piston 1 and corresponds to the channel hole 5 to form at least one closed storage groove 6. The storage groove 6 is used to collect the coating powders absorbed by the channel hole 5 to prevent the powder from spreading and affecting the operation of the compression assembly. The channel hole 5 is provided with a plurality of circles along the circumference of the compression piston 1. The inner retaining ring includes a plurality of inner retaining rings, each of which corresponds to a circle of channel holes 5.

[0027] The above structure realizes the effective collection of coating powder without changing the overall structure of the refrigerator, reduces the failures caused by friction pairs and bearing jams, and improves the overall reliability and service life of the refrigerator.

[0028] See also Figure 1-2 In some embodiments, the channel hole 5 can be divided into two circles, an upper circle and an lower circle, which are respectively located at the two ends of the compression piston 1. The inner ring includes a first inner ring 8 and a second inner ring 9, which are located at the two ends of the compression piston 1 and correspond to the upper and lower circles of the channel holes 5 of the compression piston 1 respectively. The first inner ring 8 and the second inner ring 9 correspond to the positions of the two circles of channel holes 5, forming two independent storage grooves 6 for collecting and isolating coating powder.

[0029] See also Figure 3-4 In some embodiments, an annular groove 7 is provided on the surface of the compression piston 1. The annular groove 7 serves as the base of the channel hole 5 to gather the coating powder.

[0030] See also Figure 1-2 In order to ensure the storage space and airtightness of the storage tank, the inner wall of the compression piston 1 and / or the inner retaining ring are provided with a groove or a step surface facing the channel hole to form a closed storage tank 6. These specially designed structural parts work together to form a closed storage space of the storage tank 6. Furthermore, the aperture of the channel hole is 0.3-0.8 mm, preferably 0.5 mm. This size is carefully selected to ensure that the powder can effectively enter without blocking the channel.

[0031] See also Figure 5 , the channel holes 5 are arranged in a uniform circumferential distribution to uniformly collect the coating powder from the piston surface. The design and layout of the channel holes 5 is a key innovation of the compression assembly. This unique layout ensures that the coating powder that falls off the piston surface can be effectively and evenly collected. In addition, the uniform distribution of the channel holes also helps to maintain the structural integrity and balance of the compression piston, thereby reducing additional wear caused by uneven loads.

[0032] In other embodiments, the storage groove 6 can also be opened in the side wall of the compression piston 1 and does not penetrate the side wall of the compression piston 1. Specifically, it can also be opened in a ring shape corresponding to the multiple channel holes 5. In this embodiment, there is no need to set an inner retaining ring to form a closed storage groove 6.

[0033] See also Figure 1 In some embodiments, it also includes a compression pin 2, which is laterally arranged in the inner cavity of the compression piston 1 and is used to connect the compression piston 1 and the compression connecting rod 3; the lower end of the compression connecting rod 3 is connected to the compression pin 2, and the upper end extends out of the compression cylinder; a stabilizing compression spring 4 is mounted on the compression connecting rod 3 in a compressed state, and its lower end is against the compression pin 2 to maintain the stability and shock absorption of the compression connecting rod 3. The lower end of the compression connecting rod 3 is designed to be connected to the needle bearing 10 by an interference connection. The setting position of the needle bearing 10 is located in the middle part of the compression pin 2 to achieve good mechanical balance and stability. In order to further improve the bearing capacity of the bearing and reduce maintenance requirements, a deep groove ball bearing 11 is preferably installed inside the top end of the compression connecting rod 3. The deep groove ball bearing 11 has good radial load capacity and small axial space occupation. The deep groove ball bearing can be fixed to the inside of the compression connecting rod 3 by interference crimping. The connection between the two ends of the compression pin 2 and the compression piston 1 adopts an adhesive fixing method.

[0034] Other embodiments of the utility model also disclose a Stirling refrigerator, including a motor and the above-mentioned compression assembly, wherein the motor is connected to the compression piston to provide power for the compression piston to reciprocate in the through groove of the compression cylinder. This embodiment adopts a structural design idea to optimize the design of the rotary Stirling refrigerator compression assembly. By combining the motor with the advanced compression assembly, this design utilizes the stability and controllability of the motor and the structural optimization of the compression assembly to jointly improve the performance of the entire refrigeration system.

[0035] The utility model provides a compression assembly, which is particularly suitable for a rotary Stirling refrigerator. Its core innovation lies in proposing a unique structure capable of absorbing coating powders. By evenly distributing coating powder collection channels on the compression piston and cooperating with the interference fit of the inner retaining ring and the compression piston, a closed storage tank is formed. These storage tanks not only effectively collect the coating powders that fall during the movement of the friction pair, but also have a simple structure and do not affect the assembly of other parts and the overall structure of the refrigerator. This innovation is of great significance for improving the performance of the rotary Stirling refrigerator. It not only improves the protection of parts and the overall reliability of the refrigerator without changing the existing refrigerator design, but also plays an important role in significantly reducing the negative impact of coating powders on moving parts. This reduces the early jamming of the refrigerator due to the accumulation of coating powders, thereby extending the service life of the refrigerator, reducing maintenance costs, and improving overall operating efficiency.

[0036] 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.

[0037] 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 compression assembly, comprising a compression piston, reciprocating in a through groove of a compression cylinder; characterized in that: A plurality of channel holes are distributed on the compression piston and a storage groove connected with the channel holes is arranged inside the compression piston.

2. The compression assembly according to claim 1, characterized in that: The channel hole penetrates the wall surface of the compression piston and also includes an inner retaining ring which is interference fit with the inner wall of the compression piston to form at least one closed storage groove between the inner wall of the compression piston.

3. The compression assembly according to claim 2, characterized in that: The channel holes are arranged in a plurality of circles along the circumference of the compression piston, and the inner retaining ring includes a plurality of inner retaining rings, each of which corresponds to a circle of the channel holes.

4. The compression assembly according to claim 3, characterized in that: The channel hole includes two circles, which are respectively located at two ends of the compression piston, and the inner retaining ring includes a first inner retaining ring and a second inner retaining ring, which respectively correspond to the two circles of channel holes, thereby forming two storage grooves.

5. The compression assembly according to any one of claims 2 to 4, characterized in that: The inner wall of the compression piston and / or the inner retaining ring is / are provided with a groove or a step surface on a side facing the channel hole to form a closed storage groove.

6. The compression assembly according to claim 1, characterized in that: The compression piston surface is provided with an annular groove, and the channel hole is located in the groove.

7. The compression assembly according to claim 1, characterized in that: The channel holes have a diameter of 0.3-0.8 mm and are evenly distributed around the circumference.

8. The compression assembly according to claim 1, characterized in that: It also includes a compression pin, which is transversely arranged in the inner cavity of the compression piston; a compression connecting rod, whose lower end is connected to the compression pin and whose upper end extends out of the compression cylinder; and a stabilizing compression spring, which is sleeved on the compression connecting rod in a compressed state and whose lower end is against the compression pin.

9. The compression assembly according to claim 8, characterized in that: The lower end of the compression connecting rod is interference-connected with a needle bearing, and the needle bearing is arranged in the middle of the compression pin shaft.

10. A Stirling refrigerator, characterized in that: It comprises a motor and a compression assembly as described in any one of claims 1 to 9, wherein the motor is connected to the compression piston to provide power for the compression piston to reciprocate in the through groove of the compression cylinder.

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