A throttling refrigerator

Abstract

The utility model relates to the field of refrigeration and low temperature engineering and infrared, concretely is a kind of throttling refrigerator, it include: air inlet flange, the central position of air inlet flange is equipped with air inlet hole;Heat exchanger, it is set in the upper end surface of air inlet flange, heat exchanger includes the at least two layers of heat exchange pipe of upper and lower layer arrangement, the adjacent two layers of heat exchange pipe are connected, and each layer of heat exchange pipe is spiral disc cloth;Dewar cold finger, it is sleeved in the outer surface of heat exchanger;Beneficial effect is: normal temperature high pressure refrigeration gas enters heat exchanger in the air inlet hole on air inlet flange, in each layer heat exchange pipe inside heat exchanger, then spiral flow in turn, then from the throttling hole of top layer heat exchange pipe, produce throttling refrigeration effect, form low temperature gas, cooling object such as chip is cooled by low temperature gas, by the spiral disc cloth setting of multilayer heat exchange pipe, greatly increase the heat exchange unit number of heat exchanger, to improve the heat exchange efficiency of refrigerator.

Description

Technical Field

[0001] This utility model relates to the fields of refrigeration and cryogenic engineering and infrared technology, specifically a throttling refrigerator. Background Technology

[0002] A throttling refrigerator, also known as a Joule-Thomson (JT) refrigerator, is a refrigerator that uses the Joule-Thomson effect to obtain low temperature. Its principle is that under adiabatic conditions and without external work, high-pressure gas passes through porous materials or small holes to achieve throttling expansion (reducing pressure from high pressure) and thus lowering the gas temperature.

[0003] Throttling coolers are widely used in infrared cryogenic detection, cryogenic medical treatment, aerospace and other fields due to their compact structure, rapid cooling, small size and light weight.

[0004] Existing throttling refrigerators are relatively mature in application, and most use nitrogen or argon as the refrigerant. Argon cools quickly but at a high temperature, while nitrogen cools at a lower temperature but at a slower rate. When using nitrogen as the refrigerant, a large heat exchanger and a low back pressure are usually required to achieve rapid cooling. With the increasing demand for lightweight refrigerators, achieving rapid cooling with nitrogen in a small volume is a future development trend and a problem that must be solved. Utility Model Content

[0005] The purpose of this invention is to provide a throttling cooler to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A throttling refrigerator, comprising:

[0008] An air intake flange is provided, with an air intake hole located at the center of the air intake flange.

[0009] A heat exchanger is disposed on the upper end face of the inlet flange. The heat exchanger includes at least two layers of heat exchange tubes arranged in a stacked manner, with adjacent layers of heat exchange tubes connected to each other, and each layer of heat exchange tubes is spirally coiled.

[0010] The dewar cold finger is fitted onto the outer surface of the heat exchanger.

[0011] Preferably, the air inlet of the lowest heat exchange tube is connected to the air inlet hole of the air inlet flange, and a throttling hole is provided on the top surface of the highest heat exchange tube.

[0012] Preferably, multiple throttling orifices are provided, and the multiple throttling orifices are evenly spaced.

[0013] Preferably, a guide hole is provided between the outlet of the heat exchange tube in the lower layer and the inlet of the heat exchange tube in the upper layer to connect the two.

[0014] Preferably, there is a first gap between the top surface of the heat exchanger and the top wall of the Dewar cold finger, a second gap between two adjacent heat exchange tubes in each layer of the heat exchanger, and a third gap between the bottom surface of the heat exchanger and the inlet flange. The low-temperature gas exiting through the throttling orifice flows back through the first gap, the second gap, and the third gap in sequence.

[0015] Preferably, the upper end face of the air inlet flange is provided with a support frame, and multiple support frames are provided. The multiple support frames are evenly spaced, and the lowest heat exchange tube is installed on the support frame to form the third gap between it and the air inlet flange.

[0016] Preferably, the lower end face of the Dewar cold finger is in contact with the upper end face of the plurality of support frames, and a low-temperature gas return outlet is formed between the lower end face of the Dewar cold finger and the air inlet flange.

[0017] Preferably, microfins are provided on both sides of the heat exchange tube in the horizontal direction.

[0018] Preferably, the Dewar cold finger has a cap-shaped structure, and a screw is provided between the Dewar cold finger and the upper end face of the intake flange, and the Dewar cold finger is fixed to the upper end face of the intake flange by the screw.

[0019] Preferably, a hole is provided at the center of the upper end face of the Dewar cold finger, and a cold plate is welded into the hole.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] Normal temperature and high pressure refrigerant gas enters the heat exchanger through the inlet port on the inlet flange. It flows spirally in each layer of heat exchange tubes inside the heat exchanger and then flows out from the throttling orifice on the top heat exchange tube, generating a throttling refrigeration effect and forming low temperature gas. The low temperature gas is used to cool objects such as chips. The spiral arrangement of multiple layers of heat exchange tubes greatly increases the number of heat exchange units in the heat exchanger, thereby improving the heat exchange efficiency of the refrigeration unit.

[0022] Each heat exchange tube is molded as a separate part, so no additional support parts are needed. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the refrigerator structure of this utility model;

[0024] Figure 2 This is a partial enlarged cross-sectional view of the refrigerator structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the refrigerator of this utility model.

[0026] In the diagram: 1. Inlet flange; 2. Heat exchanger; 3. Flow guide hole; 5. Throttling hole; 6. Dewar cold finger; 7. Cold plate; 8. Support frame. Detailed Implementation

[0027] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0028] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0029] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Example 1:

[0033] Please see Figures 1 to 2 This utility model provides a technical solution: a throttling refrigerator, comprising:

[0034] Air inlet flange 1, with an air inlet hole at the center of air inlet flange 1;

[0035] Heat exchanger 2 is located on the upper end face of inlet flange 1. Heat exchanger 2 includes at least two layers of heat exchange tubes arranged in a stacked manner. The two adjacent layers of heat exchange tubes are connected to each other, and each layer of heat exchange tubes is spirally coiled.

[0036] Dewar cold finger 6 is fitted onto the outer surface of heat exchanger 2;

[0037] The ambient temperature and high pressure refrigerant gas enters the heat exchanger 2 through the inlet port on the inlet flange 1. It flows spirally in each layer of heat exchange tubes inside the heat exchanger 2, and then flows out from the throttling orifice 5 on the top heat exchanger, generating a throttling cooling effect and forming low temperature gas. The low temperature gas cools the object such as the chip on the Dewar cold finger 6. The spiral arrangement of multiple layers of heat exchange tubes greatly increases the number of heat exchange units in the heat exchanger, thereby improving the heat exchange efficiency of the refrigeration unit.

[0038] Example 2:

[0039] like Figures 1-2 As shown, the throttling refrigerator disclosed in Embodiment 2 of this utility model has a structure that is basically the same as that in Embodiment 1, except that:

[0040] An air inlet is provided at the center of the bottom heat exchange tube. This air inlet is connected to the air inlet hole of the air inlet flange 1, so that the room temperature high pressure refrigerant gas can enter the bottom heat exchange tube through the air inlet hole on the air inlet flange 1.

[0041] The outlet of the lower heat exchange tube and the inlet of the upper heat exchange tube are aligned vertically, and a guide hole 3 is opened between the outlet of the lower heat exchange tube and the inlet of the upper heat exchange tube, and the lower heat exchange tube and the upper heat exchange tube are connected through the guide hole 3.

[0042] A throttling orifice 5 is provided at the center of the top surface of the uppermost heat exchange tube;

[0043] Multiple throttling orifices 5 are provided, and the multiple throttling orifices 5 are evenly spaced.

[0044] There is a first gap between the top surface of heat exchanger 2 and the top wall of Dewar cold finger 6;

[0045] There is a second gap between two adjacent turns of heat exchange tubes in each layer of heat exchanger 2, and the second gaps of each layer of heat exchange tubes are aligned vertically and connected.

[0046] The upper end face of the intake flange 1 is provided with a support frame 8, which is a strip-shaped rib that extends radially along the intake flange.

[0047] Multiple support frames 8 are provided, and the multiple support frames 8 are evenly spaced. The lowest heat exchange tube is installed on the support frame 8 to form a third gap with the air inlet flange 1.

[0048] The low-temperature gas exiting through the throttling orifice 5 flows back through the first gap, the second gap, and the third gap in sequence.

[0049] During the reflux process, the low-temperature gas exchanges heat with the room-temperature high-pressure gas in the heat exchange tube. This cycle repeats continuously, and the throttling cooling effect is amplified until the temperature drops to the cooling temperature.

[0050] The lower end face of the Dewar cold finger 6 is in contact with the upper end face of multiple support frames 8, and a low-temperature gas backflow outlet is formed between the lower end face of the Dewar cold finger 6 and the inlet flange 1.

[0051] After the low-temperature gas flows back through the recirculation channel formed by the first gap, the second gap and the third gap, it is discharged into the atmosphere from the recirculation outlet.

[0052] Each heat exchange tube has micro fins on both sides in the horizontal direction. These fins enhance the heat exchange between the gas inside and outside the heat exchange tube and improve the heat exchange efficiency.

[0053] In addition, each heat exchange tube is molded as a separate part, so no additional support parts are needed, and adjacent heat exchange tubes are fixed together by pressure welding.

[0054] The Dewar cold finger 6 has a cap-shaped structure, and a screw is provided between the Dewar cold finger 6 and the upper end face of the intake flange 1. The Dewar cold finger 6 is fixed to the upper end face of the intake flange 1 by the screw.

[0055] A hole is provided at the center of the upper end face of the Dewar cold finger 6, and a cold plate 7 is soldered into the hole. A cooling object, such as a chip, is placed on the cold plate 7.

[0056] The room temperature high pressure refrigerant gas enters the heat exchanger 2 through the inlet port on the inlet flange 1. It flows spirally in each layer of heat exchange tubes inside the heat exchanger 2, and then flows out from the throttling orifice 5 on the top heat exchanger, generating a throttling cooling effect and forming low temperature gas. The low temperature gas is used to cool the object such as the chip on the Dewar cold finger 6.

[0057] 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 the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0058] 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 throttling refrigerator characterized by, include: An air inlet flange (1) is provided with an air inlet hole at the center of the air inlet flange (1); A heat exchanger (2) is disposed on the upper end face of the inlet flange (1). The heat exchanger (2) includes at least two layers of heat exchange tubes stacked on top of each other, with adjacent layers of heat exchange tubes connected to each other, and each layer of heat exchange tubes is spirally coiled. The Dewar cold finger (6) is fitted onto the outer surface of the heat exchanger (2); The air inlet of the lowest heat exchange tube is connected to the air inlet hole of the air inlet flange (1), and a throttling hole (5) is opened on the top surface of the highest heat exchange tube. A flow guide hole (3) is provided between the outlet of the heat exchange tube in the next layer and the inlet of the heat exchange tube in the previous layer to connect the two. There is a first gap between the top surface of the heat exchanger (2) and the top wall of the Dewar cold finger (6), a second gap between two adjacent heat exchange tubes of each layer of heat exchange tubes in the heat exchanger (2), and a third gap between the bottom surface of the heat exchanger (2) and the inlet flange (1). The low-temperature gas coming out through the throttling hole (5) flows back through the first gap, the second gap and the third gap in sequence.

2. The throttling refrigerator according to claim 1, characterized in that, The throttling orifice (5) is provided in multiple locations, and the multiple throttling orifices (5) are evenly spaced.

3. The throttling refrigerator of claim 1, wherein, The upper end face of the air inlet flange (1) is provided with a support frame (8). Multiple support frames (8) are provided and are evenly spaced. The lowest heat exchange tube is installed on the support frame (8) to form the third gap between it and the air inlet flange (1).

4. The throttling refrigerator of claim 3, wherein The lower end face of the Dewar cold finger (6) is in contact with the upper end face of the plurality of support frames (8), and a low-temperature gas return outlet is formed between the lower end face of the Dewar cold finger (6) and the air inlet flange (1).

5. The throttling refrigerator of claim 1, wherein, The heat exchange tube has micro fins on both sides in the horizontal direction.

6. The throttling refrigerator of claim 1, wherein, The Dewar cold finger (6) has a cap-shaped structure, and a screw is provided between the Dewar cold finger (6) and the upper end face of the air inlet flange (1). The Dewar cold finger (6) is fixed to the upper end face of the air inlet flange (1) by the screw.

7. The throttling refrigerator of claim 1, wherein A hole is provided at the center of the upper end face of the Dewar cold finger (6), and a cold plate (7) is welded into the hole.

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