Large-size thermoelectric refrigerating unit, packaging method and mounting method

Abstract

The invention discloses a large-size thermoelectric refrigerating unit, a packaging method and an installation method, and relates to the field of thermoelectric refrigerating cold chain equipment, the large-size thermoelectric refrigerating unit comprises an assembly body and a heat preservation layer arranged outside the assembly body in a wrapping mode, and the assembly body comprises a thermoelectric refrigerating unit, a packaging frame, a cold end heat exchange block and a hot end heat conduction block; the thermoelectric refrigerating unit is installed in the packaging frame, the cold end heat exchange block and the hot end heat conduction block are fixed to the two sides of the packaging frame respectively, the cold end heat exchange block is attached to the cold end of the thermoelectric refrigerating unit, and the hot end heat conduction block is attached to the hot end of the thermoelectric refrigerating unit. The problem that the installation requirement of a large-size thermoelectric refrigerating unit is high is solved, the problem that the refrigerating unit is difficult to maintain and replace is solved, the anti-vibration dynamic environment capacity and reliability of the large-size refrigerating unit are improved, and the use and maintenance cost of cold chain equipment based on the thermoelectric refrigerating technology is reduced.

Description

Technical Field

[0001] The present invention relates to the field of thermoelectric refrigeration cold chain equipment, and in particular to a large-size thermoelectric refrigerator unit and a packaging method and an installation method. Background Art

[0002] In vibration environments such as car refrigerators and spacecraft cold chain equipment, the required cooling capacity is large, and the number of PNs integrated in the thermoelectric cooler is large, resulting in a large external size; at the same time, since such application equipment needs to work in a vibration environment for a long time, the installation of large-size thermoelectric coolers is directly related to the cooling performance and service life of the equipment. Therefore, the installation requirements for large-size thermoelectric coolers are high. Once the installation does not meet the requirements, the heat dissipation efficiency of the cooler will inevitably decrease or the PN junction of the device will be damaged in a long-term vibration environment, resulting in a decrease in the cooling performance of the equipment or failure of the cooling function. Currently, thermoelectric coolers are divided into two types: bare chips and secondary packaging for use in equipment. During installation and use, the installation torque of the thermoelectric cooler, the installation flatness and parallelism of the cold and hot end faces, and the installation of thermal conductive materials are strictly controlled. When a refrigeration unit fails, the entire refrigerator equipment needs to be replaced or the refrigeration unit needs to be replaced as a whole. The current installation of the refrigerator requires special tools for installation torque control, thermal grease application or thermal pad installation, which all require professional maintenance. The product has poor maintainability and the equipment can only be scrapped as a whole, resulting in a waste of resources. If the refrigeration unit can be replaced independently, the cost of use can be reduced. Summary of the invention

[0003] The purpose of the present invention is to provide a large-size thermoelectric refrigerator unit and a packaging method and an installation method, which solves the problem of high installation requirements of large-size thermoelectric refrigerators, overcomes the difficulty of repairing and replacing refrigeration units, improves the vibration and dynamic environment resistance and reliability of large-size refrigerators, and reduces the use and maintenance costs of cold chain equipment based on thermoelectric refrigeration technology.

[0004] To achieve the purpose of the present invention, the technical solution adopted is: a large-size thermoelectric refrigerator unit, including an assembly and an insulation layer wrapped outside the assembly, the assembly including a thermoelectric refrigerator, a packaging frame, a cold-end heat exchange block, and a hot-end heat conductive block; the thermoelectric refrigerator is installed in the packaging frame, the cold-end heat exchange block and the hot-end heat conductive block are respectively fixed on both sides of the packaging frame, and the cold-end heat exchange block is bonded to the cold end of the thermoelectric refrigerator, and the hot-end heat conductive block is bonded to the hot end of the thermoelectric refrigerator.

[0005] Furthermore, the side surface of the packaging frame also has a lead hole, and the electrical lead of the thermoelectric cooler passes through the lead hole and extends outward.

[0006] Furthermore, the cold-end heat exchange block and the hot-end heat conduction block are connected to the packaging frame by bolts.

[0007] Furthermore, the packaging frame is provided with a step groove, and the hot end heat conducting block is installed in the step groove.

[0008] Furthermore, the packaging frame has a threaded insert that cooperates with the bolt.

[0009] Furthermore, the assembly has a mechanical interface.

[0010] Furthermore, the packaging frame is made of polyetheretherketone.

[0011] Furthermore, microporous structures are uniformly distributed inside the packaging frame.

[0012] Furthermore, the packaging frame is formed by 3D printing.

[0013] Furthermore, the cold surface of the thermoelectric cooler and the hot surface of the thermoelectric cooler are both coated with heat conductive material.

[0014] Furthermore, the heat conducting material is thermally conductive silicone grease.

[0015] Furthermore, the hot end heat conducting block is made of copper.

[0016] Furthermore, the surface of the hot end heat conducting block is chrome plated.

[0017] Furthermore, the flatness of the hot-end heat conducting block and the cold-end heat exchanging block are both 0.02 mm, and the roughness Ra is both 0.4 μm.

[0018] Furthermore, the cold end heat exchange block is made of aluminum alloy.

[0019] Furthermore, the thermal insulation layer is formed by polyurethane foaming.

[0020] A packaging method for a large-size thermoelectric cooler unit comprises the following steps:

[0021] Coating a thermally conductive material on a cold surface of the thermoelectric cooler and a hot surface of the thermoelectric cooler;

[0022] The thermoelectric cooler is installed in a packaging frame, and the cold end heat exchange block and the hot end heat conduction block are fixed on the packaging frame to form an assembly;

[0023] The assembly is placed in a foaming tooling, and the polyurethane rigid foam material in the foaming tooling encapsulates the assembly;

[0024] The encapsulated assembly is removed from the foaming tooling.

[0025] Furthermore, before the assembly is placed in the foaming tooling, a protective film is attached to the upper surface and the lower surface of the assembly, and the protective film is removed after the assembly is packaged.

[0026] A method for installing a large-size thermoelectric cooler unit comprises the following steps:

[0027] Insert the assembly into the insulation interface of the cold chain equipment;

[0028] Install thermal pads on the outside of the hot-end heat transfer block and the cold-end heat exchange block;

[0029] Fit the hot-end heat-conducting block to the hot-end heat-exchanging fins through the heat-conducting gasket, and fix the assembly to the hot-end heat-exchanging fins;

[0030] The cold end heat conduction block is attached to the cold end heat exchange fin through the heat conduction gasket, and the assembly is fixed to the cold end heat exchange fin.

[0031] Furthermore, a sealing rubber pad is installed between the assembly and the insulation layer of the cold chain equipment.

[0032] The beneficial effects of the present invention are:

[0033] 1. In the present invention, a large-size bare-chip thermoelectric cooler, a cold-end heat exchange block, and a hot-end heat conduction block are assembled into one body to form a standard assembly, and a thermal insulation layer is provided to improve the vibration environment resistance and reliability of the thermoelectric cooler unit, avoid the installation process requirements such as thermal conductive material coating operation, installation torque implementation, and installation flatness control, facilitate the repair and replacement of the thermoelectric cooler unit after damage, and improve the maintainability of key units of the equipment.

[0034] 2. The packaging frame of the present invention is made of polyetheretherketone and has a microporous structure evenly distributed inside the packaging frame, thereby increasing the spatial path of heat conduction. The thermal conductivity coefficient is reduced from 0.28W / (mk) to 0.12W / (mk), a decrease of about 57%, thereby improving the thermal insulation performance of the thermoelectric cooler unit and reducing the cooling waste of the thermoelectric cooler.

[0035] 3. The present invention adopts the structure of packaging frame + thermal insulation layer, wherein the packaging frame can provide good structural protection for the large-sized thermoelectric refrigerator, and can also provide installation structural support for the hot end and the cold end of the thermoelectric refrigerator, effectively ensuring the thermal interface of the large-sized thermoelectric refrigerator, solving the problem of complex installation of large-sized thermoelectric refrigerators, improving the environmental stability of thermal conduction of large-sized thermoelectric refrigerators, and improving the vibration resistance and working reliability of large-sized refrigerators; the thermal insulation layer is formed by polyurethane foaming, which further improves the thermal insulation performance of the thermoelectric refrigerator unit, has no effect on the overall thermal insulation performance of the equipment, and can be replaced as a whole to the equipment.

[0036] 4. A mechanical interface is provided on the assembly in the present invention. The entire refrigeration unit can be replaced by using only the standard sealing rubber, thermal pad and mounting bolts without the need for special tools, applying thermal grease and other complicated operations. The original sealing and thermal insulation effects are still maintained, which simplifies the maintenance and replacement of the refrigeration unit and saves equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0038] Figure 1 It is a structural schematic diagram of a large-size thermoelectric cooler unit provided by the present invention;

[0039] Figure 2 is an exploded view of an assembly;

[0040] Figure 3 It is a cross-sectional view of the package frame;

[0041] Figure 4 It is a schematic diagram of the installation of a large-size thermoelectric cooler unit;

[0042] Figure 5 This is a simulation diagram of a large-scale thermoelectric cooler unit.

[0043] Markings and corresponding parts names in the attached drawings:

[0044] 1. Packaging frame, 2. Hot end heat conduction block, 3. Cold end heat exchange block, 4. Thermoelectric cooler, 5. Electrical leads, 6. Bolts, 7. Lead holes, 8. Mechanical interface, 9. Microporous structure, 10. Insulation layer, 11. Hot end heat exchange fins, 12. Cold end heat exchange fins, 13. Insulation layer, 14. Thermal conductive gasket, 15. Sealing rubber pad, 16. Step groove. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described herein are only used to explain the relevant content, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] like Figure 1 , Figure 2As shown, a large-size thermoelectric refrigerator unit provided by the present invention includes an assembly, which includes a thermoelectric refrigerator 4, a packaging frame 1, a cold-end heat exchange block 3, and a hot-end heat conductive block 2; wherein the thermoelectric refrigerator 4 is a 60mm×60mm bare chip, and the upper surface of the thermoelectric refrigerator 4 is the hot surface of the thermoelectric refrigerator 4, and the lower surface of the thermoelectric refrigerator 4 is the cold surface of the thermoelectric refrigerator 4; the hot-end heat conductive block 2 is mainly used to extract the heat generated by the hot end of the thermoelectric refrigerator 4 when the thermoelectric refrigerator 4 is working; the cold-end heat exchange block 3 is mainly used to exchange heat with the heat source in the cold chain equipment; the packaging frame 1 is mainly used to connect and fix the thermoelectric refrigerator 4, the hot-end heat conductive block 2 and the cold-end heat exchange block 3.

[0048] The packaging frame 1 is a structure with a through interior, the cold end heat exchange block 3 is installed on the lower side of the packaging frame 1, the hot end heat conduction block 2 is installed on the upper side of the packaging frame 1, and the thermoelectric cooler 4 is installed between the cold end heat exchange block 3 and the hot end heat conduction block 2, that is, the thermoelectric cooler 4 is located inside the packaging frame 1, and there is no need to use a connecting structure to connect the thermoelectric cooler 4 to the packaging frame 1. In order to facilitate the installation of the thermoelectric cooler 4, the cold end heat exchange block 3 also has a boss structure for the installation of the thermoelectric cooler 4, and the boss structure is adapted to the size of the inner cavity of the packaging frame 1, that is, after the cold end heat exchange block 3 is fixed to the lower end surface of the packaging frame 1, the boss structure extends into the packaging frame 1 and cooperates with the hot end heat conduction block 2 to achieve the installation of the thermoelectric cooler 4.

[0049] The assembly is surrounded by a thermal insulation layer 10, which is an integral structure with the assembly and is mainly used to provide external thermal insulation after being installed in the equipment. It should be noted that in order to ensure the heat dissipation generated by the hot end of the thermoelectric cooler 4 when it is working and the heat exchange of the heat source in the cold chain equipment, the thermal insulation layer 10 cannot be set on the upper surface of the assembly and the lower surface of the assembly, that is, there is no thermal insulation layer 10 on the outer side surface of the cold end heat exchange block 3 and the outer side surface of the hot end heat conduction block 2.

[0050] Since the thermoelectric cooler 4 is connected with an electric lead 5, when the thermoelectric cooler 4 is installed in the packaging frame 1, in order to facilitate the lead 5 of the thermoelectric cooler 4 out of the packaging frame 1, the side of the packaging frame 1 is also provided with a lead hole 7 for the power lead 5 to pass through. In addition, the specific position of the lead hole 7 on the packaging frame 1 can be adjusted according to actual conditions.

[0051] In order to facilitate the installation of the cold end heat exchange block 3 and the hot end heat conduction block 2, the cold end heat exchange block 3 and the hot end heat conduction block 2 are directly fixed to the packaging frame 1 with bolts 6. After the cold end heat exchange block 3 and the hot end heat conduction block 2 are installed on the packaging frame 1, the two ends of the packaging frame 1 are in a closed state. In order to ensure the stability of the installation of the cold end heat exchange block 3 and the hot end heat conduction block 2, there are four bolts 6 for installing the cold end heat exchange block 3 and the hot end heat conduction block 2, and the four bolts 6 are respectively located at four right angles of the packaging frame 1. In order to ensure the stability of the cold-end heat exchange block 3 after installation, when the tightening bolts 6 of the cold-end heat exchange block 3 are tightened with nuts, an anti-loosening washer is added between the nut and the packaging frame 1, and the anti-loosening washer is an M3 standard anti-loosening washer; when the hot-end heat conductive block 2 is installed, due to the limited installation space operation, before the tightening bolts 6 of the hot-end heat conductive block 2 are screwed into the packaging frame 1, a threaded insert is installed on the packaging frame 1 where the tightening bolts 6 for installing the hot-end heat conductive block 2 are screwed, so that the tightening bolts 6 used to install the hot-end heat conductive block 2 can be more stable through the threaded insert when tightened.

[0052] In order to ensure that the outer surface of the hot-end heat conductive block 2 of the large-sized thermoelectric cooler 4 unit can better contact the hot-end heat exchange fins 11 after subsequent installation, the top surface of the bolt 6 used to install the hot-end heat conductive block 2 is not higher than the outer side surface of the hot-end heat conductive block 2, that is, the hole on the hot-end heat conductive block 2 for installing the bolt 6 is a countersunk hole.

[0053] In order to reduce the heat conduction path between the cold end and the hot end of the refrigerator mounting block and enhance the thermal insulation, the inner wall of the packaging frame 1 is also provided with a step groove 16, such as Figure 3 As shown, the contact area between the hot end heat conducting block 2 and the packaging frame 1 is reduced by the step groove 16 .

[0054] In order to facilitate the subsequent installation of the large-sized thermoelectric cooler 4 unit, the assembly has a mechanical interface 8, which is a through hole for the bolt 6 to pass through; in order to ensure the stability of the large-sized thermoelectric cooler 4 unit after installation, there are eight mechanical interfaces 8 on the assembly, and the eight mechanical interfaces 8 are divided into two groups, of which four mechanical interfaces 8 are used to connect the large-sized thermoelectric cooler 4 unit with the cold-end heat exchange fins 12, and the other four mechanical interfaces 8 are used to connect the large-sized thermoelectric cooler 4 unit with the hot-end heat exchange fins 11, and the four mechanical interfaces 8 used to connect the cold-end heat exchange fins 12 and the hot-end heat exchange fins 11 are all located at four right angles of the assembly.

[0055] In the present invention, the mechanical interfaces 8 may all be located on the packaging frame 1; the four mechanical interfaces 8 for connecting the cold-end heat exchange fins 12 may also be located on the cold-end heat exchange block 3, and the four mechanical interfaces 8 for connecting the hot-end heat exchange fins 11 may also be located on the packaging frame 1; the four mechanical interfaces 8 for connecting the cold-end heat exchange fins 12 may also be located on the cold-end heat exchange block 3, and the four mechanical interfaces 8 for connecting the hot-end heat exchange fins 11 may also be located on the hot-end heat conduction block 2; the four mechanical interfaces 8 for connecting the cold-end heat exchange fins 12 may also be located on the packaging frame 1, and the four mechanical interfaces 8 for connecting the hot-end heat exchange fins 11 may also be located on the hot-end heat conduction block 2. That is, the specific positions of the mechanical interfaces 8 may be adjusted according to actual conditions.

[0056] In the present invention, the material of the packaging frame 1 is polyetheretherketone (PEEK), which has good stability and high structural strength; at the same time, the packaging frame 1 is evenly distributed with microporous structures 9, such as Figure 3 As shown. In the present invention, since the packaging frame 1 needs to be connected to the hot-end heat conducting block 2 and the cold-end heat exchange block 3 at the same time, and the temperature difference between the two connecting end surfaces of the packaging frame 1 is large, the packaging frame 1 needs good thermal insulation performance, otherwise the cold energy generated by the thermoelectric cooler 4 will be conducted to the external environment through the packaging frame 1, resulting in waste of cold energy, greatly reducing the cold energy utilization rate of the thermoelectric cooler 4; at the same time, the packaging frame 1 also needs to provide reliable mechanical installation and needs to have good mechanical properties, such as: structural size thermal stability and structural strength. In order to achieve both thermal insulation performance and good mechanical properties, the present invention uses polyetheretherketone as the raw material of the packaging frame 1, and adopts 3D printing to produce it, which improves the mechanical properties and thermal insulation of the packaging frame 1. The polyetheretherketone raw material can be formed into a structural block with a microporous structure 9 by 3D printing, and then the required packaging frame 1 is formed by mechanical processing; at the same time, since a threaded insert is embedded in the packaging frame 1, an installation and fixing interface is provided for the hot-end heat conducting block 2 and the cold-end heat exchange block 3. This design scheme, while ensuring the thermal stability and structural strength of its structural dimensions, further improves the thermal insulation performance of the packaging frame 1 in the form of its microporous structure 9 (if polyetheretherketone is used to process into a packaging frame 1 without a microporous structure 9, its thermal conductivity is 0.28W / (mk), and the packaging frame 1 with a microporous structure 9 has a thermal conductivity of 0.12W / (mk)), which reduces the waste of cooling capacity of the thermoelectric cooler 4 and improves the actual cooling efficiency of the thermoelectric cooler 4 unit.

[0057] The cold surface of the thermoelectric cooler 4 and the hot surface of the thermoelectric cooler 4 are coated with heat-conducting materials, so that the cold surface of the thermoelectric cooler 4 contacts the cold end heat exchange block 3 through the heat-conducting materials, and the hot surface of the thermoelectric cooler 4 contacts the hot end heat conduction block 2 through the heat-conducting materials. In addition, the heat-conducting material is silicone grease, and of course other materials can also be used as the heat-conducting material here.

[0058] In the present invention, in order to improve thermal conductivity, the hot end heat conductive block 2 is made of red copper, with a flatness of 0.02 mm and a roughness Ra of 0.4 μm; at the same time, in order to prevent corrosion of the hot end heat conductive block 2, its surface is chrome-plated; the end heat exchange block is made of aluminum alloy, with a flatness of 0.02 mm and a roughness Ra of 0.4 μm.

[0059] The heat-insulating layer 10 in the present invention is formed by polyurethane foaming, so that the heat-insulating layer 10 is wrapped around the assembly, thereby forming a large-sized thermoelectric cooler 4 unit.

[0060] The large-size thermoelectric refrigerator 4 unit in the present invention can be applied to cold chain equipment with different cooling requirements. It is only necessary to calculate the working current of the thermoelectric refrigerator 4 in the large-size thermoelectric refrigerator 4 unit according to the cooling requirement, and to achieve it by adjusting the power supply voltage of the thermoelectric refrigerator 4. When a large-size thermoelectric refrigerator 4 unit cannot meet the cooling required by the cold chain equipment, two or more large-size thermoelectric refrigerator 4 units can be separately arranged in the equipment to meet the large cooling requirement.

[0061] The packaging method of the above-mentioned large-size thermoelectric cooler 4 units includes the following steps:

[0062] Use four bolts 6 to pass through the bolt 6 holes at four right angles of the cold end heat exchange block 3 and the four right angles of the packaging frame 1, and put a locking washer on the tail of the bolt 6 and then screw in the nut;

[0063] Coating a heat-conducting material on the cold surface of the thermoelectric cooler 4 and the hot surface of the thermoelectric cooler 4, wherein the heat-conducting material is silicone grease;

[0064] The thermoelectric cooler 4 coated with the heat conductive material is installed into the packaging frame 1, so that the cold surface of the thermoelectric cooler 4 is attached to the cold end heat exchange block 3 through the heat conductive material; at the same time, the electric lead 5 for powering the thermoelectric cooler 4 is extended outward through the lead hole 7 on the packaging frame 1;

[0065] The hot end heat conducting block 2 is placed in the step groove 16, and the hot end heat conducting block 2 is bonded to the thermoelectric cooler 4 through the heat conducting material, and then the hot end heat conducting block 2 is connected and fixed to the packaging frame 1 by four bolts 6; in addition, it should be noted that when the hot end heat conducting block 2 is fixed by the bolts 6, the tightening torque of the four bolts 6 is first set to 0.2Nm, and the bolts 6 are tightened in a diagonal operation manner. After the bolts 6 are screwed into the threaded inserts, the tightening torque of the four bolts 6 is set to 0.3Nm, and the bolts 6 are tightened again in a diagonal operation manner, and an assembly is formed at this time;

[0066] The AC resistance value of the thermoelectric cooler 4 is tested. If the test result is normal, a protective film is attached to the outer surface of the hot-end heat-conducting block 2 and the outer surface of the cold-end heat-exchanging block 3;

[0067] Place the assembly with the protective film attached into the foaming tooling, inject polyurethane into the foaming tooling, and the polyurethane foams in the foaming tooling and fills the surroundings and gaps of the assembly. Remove the foaming tooling after 24 hours and remove the protective film on the outer surface of the hot-end heat conducting block 2 and the outer surface of the cold-end heat exchange block 3.

[0068] It should be noted that tightening the bolts 6 in a diagonal operation manner means first tightening two diagonally arranged bolts 6 and then tightening the other two diagonally arranged bolts 6 .

[0069] In the packaging method of four units of a large-size thermoelectric cooler, the sequence of the above steps can be adjusted according to needs.

[0070] When the large-size thermoelectric cooler 4 unit provided by the present invention is used, Figure 4 As shown, the installation method includes the following steps:

[0071] A thermally conductive pad 14 is placed outside the hot end heat conductive block 2, and the thickness of the thermally conductive pad 14 is 0.5 mm;

[0072] The large-sized thermoelectric cooler 4 unit is fixed to the hot-end heat exchange fin 11 by bolts 6 through the mechanical interface 8 on the packaging frame 1;

[0073] A sealing rubber pad 15 is pasted around the large-sized thermoelectric cooler 4 unit, and the thickness of the sealing rubber pad 15 is 2 mm;

[0074] Insert the large-sized thermoelectric cooler 4 unit with the sealing rubber pad 15 into the interface of the heat insulation layer 13 of the cold chain equipment. At this time, the large-sized thermoelectric cooler 4 is tightly attached to the heat insulation layer 13 of the cold chain equipment through the sealing rubber pad 15.

[0075] A thermally conductive pad 14 is placed outside the cold end heat conductive block, and the thickness of the thermally conductive pad 14 is 0.5 mm;

[0076] The large-sized thermoelectric cooler 4 unit is fixed to the cold-end heat exchange fin 12 by bolts 6 through the mechanical interface 8 on the cold-end heat conduction block.

[0077] After the large-size thermoelectric refrigerator 4 unit is installed, when the thermoelectric refrigerator 4 is powered on, the heat generated by the hot surface of the thermoelectric refrigerator 4 is transferred to the hot end heat dissipation fins of the cold chain equipment through the hot end heat conduction block 2, and the cold generated by the cold surface of the thermoelectric refrigerator 4 is transferred to the equipment cavity of the cold chain equipment through the cold end heat exchange block 3, thereby reducing the temperature of the goods in the cavity. Take the refrigerator working current of 4.5A, the external environment temperature of 25℃, and the size of the thermoelectric refrigerator 4 of 60mm×60mm as an example for simulation calculation. Figure 5 As shown, it is concluded that the temperature difference between the cold end of the large-sized thermoelectric cooler 4 unit and the hot end of the large-sized thermoelectric cooler 4 unit is greater than 50°C.

[0078] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A large-size thermoelectric cooler unit, characterized in that: The invention comprises an assembly and a heat-insulating layer (10) arranged outside the assembly, wherein the assembly comprises a thermoelectric cooler (4), a packaging frame (1), a cold-end heat exchange block (3), and a hot-end heat conduction block (2); the thermoelectric cooler (4) is installed in the packaging frame (1), the cold-end heat exchange block (3) and the hot-end heat conduction block (2) are respectively fixed on both sides of the packaging frame (1), and the cold-end heat exchange block (3) is bonded to the cold end of the thermoelectric cooler (4), and the hot-end heat conduction block (2) is bonded to the hot end of the thermoelectric cooler (4).

2. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The side surface of the packaging frame (1) also has a lead hole (7), and the electric lead (5) of the thermoelectric cooler (4) passes through the lead hole (7) and extends outward.

3. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The cold end heat exchange block (3) and the hot end heat conduction block (2) are both connected to the packaging frame (1) by means of bolts (6).

4. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The packaging frame (1) also has a step groove (16), and the hot end heat conducting block (2) is installed in the step groove (16).

5. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The packaging frame (1) is provided with a threaded insert that cooperates with the bolt (6).

6. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The assembly is provided with a mechanical interface (8).

7. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The material of the packaging frame (1) is polyetheretherketone.

8. The large-size thermoelectric cooler unit according to claim 1, characterized in that: Microporous structures (9) are evenly distributed inside the packaging frame (1).

9. The large-sized thermoelectric cooler unit according to claim 7 or 8, characterized in that: The packaging frame (1) is formed by 3D printing.

10. The large-size thermoelectric cooler unit according to claim 1, characterized in that: The cold surface of the thermoelectric cooler (4) and the hot surface of the thermoelectric cooler (4) are both coated with heat-conducting material.

11. The large-size thermoelectric cooler unit according to claim 10, characterized in that: The thermal conductive material is thermal grease.

12. The large-size thermoelectric cooler unit according to claim 1, characterized in that The hot end heat conducting block (2) is made of red copper.

13. The large-size thermoelectric cooler unit according to claim 12, characterized in that: The surface of the hot end heat conducting block (2) is chrome plated.

14. The large-size thermoelectric cooler unit according to claim 1, 12 or 13, characterized in that: The flatness of the hot end heat conducting block (2) and the cold end heat exchange block (3) are both 0.02 mm, and the roughness Ra is both 0.4 μm.

15. The large-size thermoelectric cooler unit according to claim 1, characterized in that The cold end heat exchange block (3) is made of aluminum alloy.

16. A large-size thermoelectric cooler unit according to any one of claims 1 to 8, 10 to 13, characterized in that: The thermal insulation layer (10) is formed by polyurethane foaming.

17. The packaging method of the large-size thermoelectric cooler unit according to any one of claims 1 to 16, comprising the following steps: Coating a heat-conducting material on a cold surface of the thermoelectric cooler (4) and a hot surface of the thermoelectric cooler (4); The thermoelectric cooler (4) is installed in the packaging frame (1), and the cold end heat exchange block (3) and the hot end heat conduction block (2) are fixed on the packaging frame (1) to form an assembly; The assembly is placed in a foaming tooling, and the polyurethane rigid foam material in the foaming tooling encapsulates the assembly; The encapsulated assembly is removed from the foaming tooling.

18. According to the packaging method of a large-size thermoelectric cooler unit of claim 17, before the assembly is placed in the foaming tooling, a protective film is attached to the upper surface and the lower surface of the assembly, and the protective film is removed after the assembly is packaged.

19. The method for installing a large-sized thermoelectric cooler unit according to any one of claims 1 to 16, characterized in that: The steps include: Inserting the assembly into the interface of the insulation layer (13) of the cold chain equipment; Installing heat-conducting gaskets (14) on the outer sides of the hot-end heat-conducting block (2) and the cold-end heat-exchanging block (3); The hot end heat conducting block (2) is fitted to the hot end heat exchange fin (11) via a heat conducting gasket (14), and the assembly is fixed to the hot end heat exchange fin (11); The cold end heat conduction block is bonded to the cold end heat exchange fin (12) via a heat conduction gasket (14), and the assembly is fixed to the cold end heat exchange fin (12).

20. The method for installing a large-size thermoelectric cooler unit according to claim 19, characterized in that: A sealing rubber pad (15) is installed between the assembly and the heat insulation layer (13) of the cold chain equipment.

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