Sleeve type two-stage throttling refrigerator

Abstract

The utility model relates to the technical field of refrigerators, in particular to a sleeve type two-stage throttling refrigerator which is characterized in that a first throttling hole is formed in a refrigeration-stage throttling element; the heat exchange tube sleeve is connected to the surface of the refrigeration-level throttling element, and a refrigeration-level capillary tube and a pre-cooling-level capillary tube are arranged in the heat exchange tube sleeve; the refrigeration-stage capillary tube and the pre-cooling-stage capillary tube are arranged in the heat exchange tube sleeve, high-pressure fluid in the pre-cooling-stage capillary tube is throttled through the first throttling hole, and generated low-temperature and low-pressure fluid is in contact with the refrigeration-stage capillary tube through the pre-cooling-stage capillary tube for heat exchange; the high-pressure fluid in the refrigeration-stage capillary tube is pre-cooled through the cooling-stage throttling element, then the pre-cooled high-pressure fluid in the refrigeration-stage capillary tube is throttled and refrigerated through the refrigeration-stage throttling element, and therefore the higher refrigeration speed is achieved, meanwhile, the heat exchange tube sleeve does not need a traditional mandrel supporting structure and can be bent and coiled according to the space environment, and the heat exchange efficiency is improved. And the effective utilization of the space is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, specifically a sleeve-type two-stage throttling refrigeration unit. Background Technology

[0002] Infrared detectors are widely used in civilian and military equipment such as infrared thermal imagers, infrared forward-looking and night vision, missile guidance, and space applications. Throttling coolers, with their advantages of compact structure, small size, light weight, and fast start-up, have been widely used in infrared systems.

[0003] Most throttling refrigerators currently in use are cone-shaped fixed structure refrigerators with mandrel support. Although the mandrel structure can provide support for the heat exchange tubes, it inevitably reduces the effective utilization of space. Especially in two-stage throttling refrigerators that pursue rapid cooling, in addition to the original heat exchange tube structure, there is a second-stage heat exchange tube structure. Therefore, the volume of throttling refrigerators under the traditional mandrel structure is usually significantly larger. Utility Model Content

[0004] The purpose of this invention is to provide a coaxial two-stage throttling refrigerator to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A coaxial two-stage throttling refrigerator, comprising:

[0007] The refrigeration stage throttling element has a first throttling orifice inside;

[0008] A heat exchange tube sleeve is connected to the surface of the refrigeration stage throttling element. The heat exchange tube sleeve contains a refrigeration stage capillary and a precooling stage capillary. The surface of the precooling stage capillary has multiple second throttling holes.

[0009] Preferably, the first throttling orifice is provided in multiple forms.

[0010] Preferably, the heat exchange tube sleeve is made of stainless steel.

[0011] Preferably, a connection structure is provided between the heat exchange tube sleeve and the refrigeration stage throttling element.

[0012] Preferably, one end of the connecting structure is connected to the heat exchange tube sleeve, and the other end of the connecting structure is connected to the refrigeration stage throttling element. The connecting structure is used to connect the heat exchange tube sleeve to the refrigeration stage throttling element.

[0013] Preferably, the refrigeration stage capillary tube is provided with at least one...

[0014] Preferably, each of the refrigeration stage capillary tubes corresponds to one of the first throttling orifices.

[0015] Preferably, at least one precooling stage capillary is provided, and the second throttling orifice is distributed on the side and / or top of the precooling stage capillary.

[0016] Preferably, the precooling stage capillary is attached to the refrigeration stage capillary.

[0017] Preferably, the total diameter of the refrigeration stage capillary and the precooling stage capillary inside the heat exchange tube sleeve is equal to the internal diameter of the heat exchange tube sleeve.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention incorporates a refrigeration stage capillary and a precooling stage capillary inside a heat exchanger tube sleeve. The high-pressure fluid inside the precooling stage capillary is throttled through a second throttling orifice, resulting in a low-temperature, low-pressure fluid that flows into the heat exchanger tube sleeve through the second throttling orifice and contacts the refrigeration stage capillary for heat exchange. This precools the high-pressure fluid inside the refrigeration stage capillary. The precooled high-pressure fluid then undergoes throttling and cooling through a refrigeration stage throttling element, achieving a faster cooling rate. Furthermore, the heat exchanger tube sleeve eliminates the need for a traditional mandrel support structure, allowing for bending and coiling according to the available space, significantly improving space utilization. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the heat exchanger tube sleeve of this utility model.

[0022] In the figure: 1. Refrigeration stage throttling element, 11. 11. 2. 2. Refrigeration stage capillary tube, 21. 3. 4. 3. 4. 4. 5. 6. 4. 7. 8. 8. 9. 10. 11. 11. 12. 13. 14. 15. 16. 17. 18. 19. Detailed Implementation

[0023] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0024] Please see the appendix Figure 1 To be continued Figure 2 As shown, this utility model provides a coaxial two-stage throttling refrigerator, comprising:

[0025] The refrigeration stage throttling element 1 has a first throttling orifice 11 inside, and multiple first throttling orifices 11 are provided;

[0026] The heat exchange tube sleeve 2 is connected to the surface of the refrigeration stage throttling element 1. The heat exchange tube sleeve 2 is made of stainless steel. A connection structure 3 is provided between the heat exchange tube sleeve 2 and the refrigeration stage throttling element 1. One end of the connection structure 3 is connected to the heat exchange tube sleeve 2, and the other end of the connection structure 3 is connected to the refrigeration stage throttling element 1. The connection structure 3 is used to connect the heat exchange tube sleeve 2 and the refrigeration stage throttling element 1. The heat exchange tube sleeve 2 is provided with a refrigeration stage capillary tube 21 and a precooling stage capillary tube 22.

[0027] At least one refrigeration stage capillary tube 21 is provided, and each refrigeration stage capillary tube 21 corresponds to a first throttling orifice 11.

[0028] At least one precooling stage capillary tube 22 is provided. Each precooling stage capillary tube 22 has multiple second throttling holes on its surface. The second throttling holes are distributed on the side of the precooling stage capillary tube 22. The precooling stage capillary tube 22 is attached to the refrigeration stage capillary tube 21. The second throttling holes can also be provided at the top of the precooling stage capillary tube 22 for heat exchange of the refrigeration stage throttling element. The total diameter of the refrigeration stage capillary tube 21 and the precooling stage capillary tube 22 inside the heat exchange tube sleeve 2 is equal to the internal diameter of the heat exchange tube sleeve 2.

[0029] This invention proposes a sleeve-type two-stage throttling refrigerator. In use, the high-pressure fluid inside the pre-cooling stage capillary tube 22 is throttled through the second throttling orifice. The resulting low-temperature, low-pressure fluid flows into the heat exchange tube sleeve 2 through the second throttling orifice and contacts the refrigeration stage capillary tube 21 for heat exchange, thus pre-cooling the high-pressure fluid inside the refrigeration stage capillary tube 21. Then, the pre-cooled high-pressure fluid inside the refrigeration stage capillary tube 21 is throttled and cooled by the refrigeration stage throttling element 1, thereby achieving a faster cooling speed. At the same time, the heat exchange tube sleeve 2 does not require a traditional mandrel support structure and can be bent and coiled according to the space environment, greatly improving the effective utilization of space.

[0030] As a further improvement of this utility model, the heat exchange tube sleeve 2 is made of materials such as rubber and flexible plastic, which further improves the bending performance of the heat exchange tube sleeve 2, thereby further improving the adaptability of the throttling cooler to space.

[0031] Working Principle: Throttling coolers, with their advantages of compact structure, small size, light weight, and fast start-up, have been widely used in infrared systems. This utility model proposes a sleeve-type two-stage throttling cooler. In use, the high-pressure fluid inside the pre-cooling stage capillary tube 22 is throttled through the first throttling orifice 11. The resulting low-temperature, low-pressure fluid comes into contact with the cooling stage capillary tube 21 through the pre-cooling stage capillary tube 22 for heat exchange, thus pre-cooling the high-pressure fluid inside the cooling stage capillary tube 21. Then, the pre-cooled high-pressure fluid inside the cooling stage capillary tube 21 is throttled and cooled by the cooling stage throttling element 1, thereby achieving a faster cooling speed. At the same time, the heat exchange tube sleeve 2 does not require a traditional mandrel support structure and can be bent and coiled according to the space environment, greatly improving the effective utilization of space.

[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0033] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coaxial two-stage throttling refrigerator, characterized in that, include: A refrigeration stage throttling element (1) is provided with a first throttling orifice (11) inside the refrigeration stage throttling element (1). Heat exchange tube sleeve (2), the heat exchange tube sleeve (2) is connected to the refrigeration stage throttling element (1), the heat exchange tube sleeve (2) is provided with a refrigeration stage capillary tube (21) and a precooling stage capillary tube (22) inside, and the surface of the precooling stage capillary tube (22) is provided with a plurality of second throttling holes.

2. The coaxial two-stage throttling refrigerator according to claim 1, characterized in that, The first throttling orifice (11) is provided in multiple ways.

3. The coaxial two-stage throttling refrigerator according to claim 1, characterized in that, The heat exchange tube sleeve (2) is made of stainless steel.

4. The coaxial two-stage throttling refrigerator according to claim 1, characterized in that, A connection structure (3) is provided between the heat exchange tube sleeve (2) and the refrigeration stage throttling element (1).

5. The coaxial two-stage throttling refrigerator according to claim 4, characterized in that, One end of the connection structure (3) is connected to the heat exchange tube sleeve (2), and the other end of the connection structure (3) is connected to the refrigeration stage throttling element (1). The connection structure (3) is used to connect the heat exchange tube sleeve (2) to the refrigeration stage throttling element (1).

6. The coaxial two-stage throttling refrigerator according to claim 2, characterized in that, At least one refrigeration stage capillary tube (21) is provided.

7. The coaxial two-stage throttling refrigerator according to claim 6, characterized in that, Each of the refrigeration stage capillary tubes (21) corresponds to one of the first throttling orifices (11).

8. The coaxial two-stage throttling refrigerator according to claim 1, characterized in that, At least one precooling stage capillary (22) is provided, and the second throttling orifice is distributed on the side and / or top of the precooling stage capillary (22).

9. The coaxial two-stage throttling refrigerator according to claim 8, characterized in that, The precooling stage capillary (22) is attached to the refrigeration stage capillary (21).

10. The coaxial two-stage throttling refrigerator according to claim 9, characterized in that, The total diameter of the refrigeration stage capillary (21) and the precooling stage capillary (22) inside the heat exchange tube sleeve (2) is equal to the internal diameter of the heat exchange tube sleeve (2).

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