Structure for keeping vacuum degree of sealing cavity of refrigeration camera for long time and refrigeration implementation method

Abstract

The invention discloses a structure for keeping the vacuum degree of a sealing cavity of a refrigeration camera for a long time, and the structure comprises a sealing structure which is made of a high-sealing material so as to form an internal vacuum environment. The sealing structure comprises an outer sealing cavity and an inner sealing cavity, the outer sealing cavity completely wraps the inner sealing cavity and is located outside the inner sealing cavity so as to isolate the inner sealing cavity from outside air, and a vacuum buffer area and a vacuum pump connector are formed between the outer sealing cavity and the inner sealing cavity at a certain interval. The vacuum pump interface is arranged on the sealing structure and is connected with an external vacuum pump to extract gas in the sealing structure, so that a vacuum environment is formed in the sealing structure, and the sealing enhancing device is arranged around a seam of the sealing structure; and the refrigerating device is thermally connected with the sealing structure. According to the structure, a double structure of the outer sealing cavity and the inner sealing cavity is adopted, a vacuum buffer area is formed, and the influence of external air on internal core components is effectively isolated.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated cameras, and in particular to a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time and a refrigeration implementation method. Background Art

[0002] At present, the advanced refrigeration technology of cameras is mainly mastered by internationally renowned camera manufacturers such as Andor, PI, Binsong, Nuvu, etc. The above companies use thermoelectric coolers combined with their unique vacuum packaging patented technology to reduce the operating temperature of the camera. However, the above manufacturers regard refrigeration technology as the core competitiveness of their products, so the relevant technical details are not disclosed. In general, its core technology is mainly to achieve ultra-low temperature refrigeration through the organic combination of thermoelectric refrigeration technology and vacuum packaging technology. In addition to thermoelectric coolers, there are other refrigeration technologies, such as pulse tube refrigerators and Joule-Thomson refrigerators.

[0003] In terms of the working principle of vacuum packaging technology, it mainly changes the heat transfer mode by adjusting the pressure of the residual gas, thereby significantly reducing the heat transfer amount of the residual gas. Specifically, as the residual gas pressure gradually drops from atmospheric pressure to near absolute vacuum, the heat transfer of the gas will go through four different stages: continuous medium state, temperature jump state, transition state and free molecule state. The key challenge of this technology is how to maintain the pressure of the residual gas below the critical pressure P for a long time. There are two main factors affecting this difficulty: one is that there may be leakage in the sealed cavity, causing external gas molecules to penetrate into the sealed cavity through the holes under the action of pressure difference; the other is that the gas molecules dissolved or adsorbed on the inner surface of the sealed cavity and the surface of the internal components may be released in a vacuum environment. In order to solve the above problems, we have improved the existing vacuum insulation process and optimized the structural design of the refrigerated camera from two aspects, thereby providing a structure for maintaining the vacuum degree of the sealed cavity of a refrigerated camera for a long time and a refrigeration implementation method. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a structure for maintaining the vacuum degree of the sealed chamber of a refrigerated camera for a long time. Through the double sealed chamber design, multiple seal enhancement technology, weak pressure difference control, and high-precision manufacturing and material selection, the stable operation of the internal components of the camera and the extension of the service life are ensured. At the same time, the release of gas molecules in a vacuum environment is reduced through polishing, further improving the stability and reliability of the structure.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, comprising:

[0006] The sealing structure has an internal vacuum environment; the sealing structure includes an outer sealing cavity and an inner sealing cavity, the inner sealing cavity contains several core components, the outer sealing cavity fully wraps and is located outside the inner sealing cavity to isolate the inner sealing cavity from the outside air, a vacuum buffer area is formed between the outer sealing cavity and the inner sealing cavity by a certain interval, the outer surface and the inner surface of the inner sealing cavity are polished or plated with a high reflectivity coating, the inner surface of the outer sealing cavity is polished, and the vacuum degree of the outer sealing cavity and the inner sealing cavity is controlled within 10 -6 Pa, and the pressure difference ratio between the inner sealed cavity and the outer sealed cavity is controlled to be less than 5, so that the leakage rate of the sealed cavity is less than 6.7×10 -10 Pa·L / s.

[0007] A vacuum pump interface, which is arranged on the sealing structure and connected to an external vacuum pump to extract gas from the sealing structure to form a vacuum environment inside the sealing structure;

[0008] A sealing reinforcement device, which is arranged around the joint of the sealing structure;

[0009] A refrigeration device is thermally connected to the sealed structure.

[0010] The above structure adopts a dual structure of an outer sealed cavity and an inner sealed cavity to form a vacuum buffer area, which effectively isolates the influence of external air on the internal core components. At the same time, the release of gas molecules in a vacuum environment is reduced through polishing treatment, further improving the stability and reliability of the structure.

[0011] In order to improve the sealing effect, the above-mentioned sealing enhancement device includes a first seal arranged between the inner wall of the outer sealing cavity and the outer wall of the inner sealing cavity, and a second seal arranged at the joint and port of the outer sealing cavity. A third seal is provided at the connection between the vacuum pump interface and the inner sealing cavity and the outer sealing cavity.

[0012] The above structure adopts multiple seal enhancements for the special structure of double-chamber seal. By arranging multiple seals at the joints and ports, including the first seal, the second seal and the third seal, the sealing of the overall structure is greatly enhanced, reducing the possibility of gas leakage.

[0013] In view of the special structure of the double-chamber seal, the present invention selects a TEC refrigerator for the selection of the refrigerator, and makes the following detailed improvements to the specific structure to better fit the double-chamber seal. Specifically, the refrigeration device includes a cold source, a refrigerant circulation system and a heat exchanger. The cold source is located in the main part of the refrigeration device. The refrigerant circulation system passes through the inner sealed cavity through a sealed pipe to transport the low-temperature refrigerant generated by the cold source to the heat exchanger. The heat exchanger contacts the inner wall of the inner sealed cavity directly or through a heat-conducting element, and the outer and inner surfaces of the inner sealed cavity are polished to effectively reduce heat radiation and heat absorption, thereby ensuring that the inner sealed cavity has a stable low-temperature environment.

[0014] As a further optimization of the above scheme, the heat exchanger includes a base, a copper heat pipe and an aluminum alloy fin. The heat pipe passes through the aluminum fin and is vertically inserted into the base. Inlet and outlet water pipes are provided under the heat pipe. A water circulation passage is provided inside the base and the water circulation passage is connected to the inlet and outlet water pipes. A combined design of the base, copper heat pipe and aluminum alloy fins is adopted to form a water cooling mode, which increases the heat dissipation area, improves the heat exchange efficiency, and further ensures the cooling effect.

[0015] As a further optimization of the above scheme, in the double-chamber sealing technology, the sealing of the soft flat cable part has a greater impact on the sealing condition. Therefore, in the technical scheme of the present invention, the soft flat cable connects the core component and leads the image signal of the core component out of the sealing structure, and the inner sealing chamber and the outer sealing chamber are located on the soft flat cable lead-out path. There are double-sided sealing plates, and the double-sided sealing plates are provided with a U-shaped groove for the soft flat cable to pass through. The inner side of the U-shaped groove is coated with vacuum sealant and both sides of the U-shaped groove are sealed by O-rings, and the two double-sided sealing plates are arranged vertically to form a soft flat cable with a tortuous path, thereby increasing the travel length of the soft flat cable in the sealing structure, increasing the complexity of the gas or liquid leakage path to a certain extent, and achieving a sealing effect that fits the double-chamber seal.

[0016] A method for achieving refrigeration for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, comprising the following steps:

[0017] S1. After the flexible flat cable in the inner sealed cavity is cured by glue sealing, it is vacuumed and sealed with an O-ring;

[0018] S2. After the soft cable seal of the outer sealed cavity is cured, the inner sealed cavity that has been evacuated and sealed is fastened to the sealing bottom plate by screws;

[0019] S3. Install the outer sealing cavity and evacuate it;

[0020] S4. The vacuum nozzle is used to extract the gas in the cavity, and its opening and closing are achieved by screwing the thread of the sealing plug to maintain the vacuum state of the inner sealed cavity and the outer sealed cavity;

[0021] S5. Control the vacuum degree of the outer sealed cavity and the inner sealed cavity at 10 -6 Pa or above, and the pressure difference ratio between the inner sealed cavity and the outer sealed cavity is controlled to be less than 5.

[0022] The structure of the refrigeration camera sealed chamber for maintaining the vacuum degree for a long time of the present invention has the following beneficial effects:

[0023] 1. The invention provides a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time. The double sealed chamber design, multiple seal enhancement technology, slight pressure difference control, and high-precision manufacturing and material selection ensure the stable operation of the internal components of the camera and extend the service life. At the same time, the release of gas molecules in a vacuum environment is reduced by polishing, further improving the stability and reliability of the structure.

[0024] 2. The present invention provides a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time. In terms of the selection of a refrigerator, a TEC refrigerator is selected, and detailed improvements are made to the specific structure to better fit the double-chamber seal. The outer and inner surfaces of the inner sealed chamber are polished to effectively reduce heat radiation and heat absorption, thereby ensuring that the inner sealed chamber has a stable low-temperature environment.

[0025] 3. The present invention provides a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, so that two double-sided sealing plates are arranged vertically to form a flexible flat cable with a tortuous path, thereby increasing the length of the flexible flat cable passing through the sealing structure, and to a certain extent increasing the complexity of the gas or liquid leakage path, thereby achieving a sealing effect that fits the dual-chamber seal, which is more in line with the dual-chamber sealing structure.

[0026] 4. The present invention provides a refrigeration method for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, and is used in conjunction with the above-mentioned structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, thereby achieving efficient refrigeration effect and long-term stable vacuum degree maintenance, providing strong support for the reliable operation of the refrigerated camera.

[0027] With reference to the following description and drawings, a specific embodiment of the present invention is disclosed in detail, indicating the manner in which the principle of the present invention can be adopted. It should be understood that the scope of the embodiment of the present invention is not limited thereby, and the embodiment of the present invention includes many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time;

[0029] Figure 2 It is a schematic diagram of the structure of the heat exchanger in the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the flexible flat cable in the present invention;

[0031] Figure 4 It is a structural schematic diagram of the double-sided sealing plate in the present invention;

[0032] Figure 5 It is a structural schematic diagram of the sealing enhancement device in the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the vacuum pump interface in the present invention.

[0034] In the figure: 1. Sealing structure; 11. External sealing cavity; 12. Internal sealing cavity; 2. Vacuum pump interface; 3. Sealing enhancement device; 31. First sealing member; 32. Second sealing member; 33. Third sealing member; 4. Refrigeration device; 41. Cold source; 42. Refrigerant circulation system; 43. Heat exchanger; 431. Base; 432. Copper heat pipe; 433. Aluminum alloy fins; 434. Inlet and outlet water pipes; 5. Core components; 6. Flexible flat cable; 61. Double-sided sealing plates. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on, provided with" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected, connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. "Fixed connection" means a fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this article. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] Please refer to the instruction manual Figure 1-6 The present invention provides a first embodiment of a structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time. In this embodiment, the structure includes the following parts:

[0039] Sealing structure 1:

[0040] The sealing structure 1 is made of highly sealing materials to maintain a high vacuum environment inside. The structure includes two main parts: an outer sealed cavity 11 and an inner sealed cavity 12. Multiple core components 5, such as a CMOS sensor, are precisely placed inside the inner sealed cavity 12. The outer sealed cavity 11 is completely wrapped around the outside of the inner sealed cavity 12, forming an effective barrier to isolate the inner sealed cavity 12 from contact with the outside air.

[0041] A certain interval is maintained between the two sealed cavities to form a vacuum buffer area to reduce the impact of external air on the environment inside the inner sealed cavity 12.

[0042] In terms of material selection, the inner sealed cavity 12 and the outer sealed cavity 11 are both made of metal materials, such as aluminum alloy or stainless steel.

[0043] During the manufacturing process, the inner sealed cavity 12 is first vacuumed and then precisely assembled with the outer sealed cavity 11 to ensure the tightness of the seal and improve the stability of the overall structure. After the assembly is completed, the outer sealed cavity 11 is vacuumed to form a highly vacuumed closed environment.

[0044] In order to further improve the sealing performance, the outer and inner surfaces of the inner sealed cavity 12 are precision polished or plated with a high reflectivity coating, and the inner surface of the outer sealed cavity 11 is also polished to reduce the radiation effect of the outer cavity, reduce heat leakage, and improve the cooling effect on the sensor.

[0045] Furthermore, through careful regulation, the vacuum degree of the sealing structure 1 is strictly controlled within 10 -6 Pa, and the pressure difference ratio between the inner sealed cavity 12 and the outer sealed cavity 11 is less than 5, which reduces the possibility of external gas molecules penetrating into the sealed cavity through the holes under the action of the pressure difference, so that the sealed cavity leakage rate of the sealed cavity is less than 6.7×10 -10 Pa·L / s, and the lowest cooling level for CMOS and other chips can reach -88.7℃ to -89.6℃, which meets the cooling needs and is on par with or slightly higher than the cooling level of similar cameras from foreign manufacturers.

[0046] In further detail, for the temperature value monitoring of the above-mentioned CMOS and other chips in actual situations, due to the large temperature difference between the cold and hot surfaces of the thermoelectric cooler during operation, the physical properties of the thermoelectric unit change with the specific position, and the constant property assumption is difficult to hold. Therefore, the present invention adopts finite element analysis and empirical parameter method for comprehensive comparative analysis in the embodiment to obtain the lowest cooling temperature range of -88.7°C to -89.6°C.

[0047] Specifically, after the inner sealed cavity 12 is assembled with the sealing bottom plate, an external vacuum pump is used to evacuate the interior of the inner sealed cavity 12 through an exhaust nozzle. Similarly, after the outer sealed cavity 11 is assembled with the sealing base 431, an external vacuum pump is used to evacuate the interior of the outer sealed cavity 11 through an exhaust nozzle. After the pressure difference reaches a certain value, the external vacuum pump evacuates the outer sealed cavity 11 through an exhaust nozzle to change the existing pressure condition of the outer sealed cavity 11.

[0048] Refrigeration unit 4:

[0049] In view of the special needs of the double-chamber sealed structure 1, the refrigeration device 4 adopts TEC (thermoelectric cooler) technology. In the specific improvement process, cooperation can be made with TEC manufacturers to customize TEC, which specifically includes a cold source 41, a refrigerant circulation system 42 and a heat exchanger 43. The cold source 41 is located in the main part of the refrigeration device 4, and the low-temperature refrigerant is transported to the heat exchanger 43 through the refrigerant circulation system 42. The heat exchanger 43 is in close contact with the inner wall of the inner sealed cavity 12 directly or through a heat-conducting element, and cooperates with the polishing treatment of the outer and inner surfaces of the inner sealed cavity 12, which effectively reduces heat radiation and heat absorption, ensuring that the inner sealed cavity 12 can maintain a stable low-temperature environment.

[0050] Furthermore, the CMOS sensor is connected to the refrigeration device 4 via a cold plate. In terms of material selection, the cold plate is made of oxygen-free copper.

[0051] In order to further enhance the cooling effect, thermal conductive interface materials, such as indium sheets, thermal conductive silicone pastes, etc., are filled between the internal parts of the inner sealed cavity 12 .

[0052] In the selection of the heat exchanger 43, the heat exchanger 43 in this embodiment is composed of a base 431, a copper heat pipe 432 and an aluminum alloy fin 433. The copper heat pipe 432 passes through the aluminum fin and is vertically inserted into the base 431. An inlet and outlet water pipe 434 is provided below the heat pipe. The inside of the base 431 can circulate heat through the water circuit. The joints are one-way valve quick-plug joints, which are installed in both forward and reverse directions to prevent liquid leakage when docking with an external water pipe. This allows the refrigeration device 4 to work efficiently and provide a stable low-temperature environment for the internal core component 5.

[0053] Furthermore, we can also design a mixed structure of air cooling and water cooling on the heat exchanger 43. Specifically, on the basis of the existing heat exchange structure, a fan is installed on the aluminum fins. The specific working mode is as follows:

[0054] Start the fan, and the heat will be transferred from the bottom surface to the atmosphere along the heat pipe through the cooling fins, which is the same as the traditional heat pipe fin heat dissipation method. When the water cooling mode is enabled, it needs to be handled in two situations. The first situation is that the cooling water temperature is high or the heat dissipation heat is very large, causing the temperature of the contact point between the heat pipe and the water cooling radiator to be higher than the ambient temperature. At this time, the fan should be started and the fins should be used for auxiliary heat dissipation. The second situation is that the temperature of the contact point between the heat pipe and the water cooling radiator is lower than the ambient temperature. At this time, the fan should be turned off to prevent the heat in the environment from being reversely transferred to the water cooling radiator through the fins and heat pipes.

[0055] Vacuum pump interface 2:

[0056] The vacuum pump interface 2 is cleverly designed and installed on the sealing structure 1 for connecting an external vacuum pump. Through the interface, the external vacuum pump can effectively extract the gas in the sealing structure 1, ensuring that a high vacuum environment can be quickly and stably formed inside the sealing structure 1.

[0057] Sealing enhancement device 3:

[0058] In order to further improve the sealing effect, the sealing enhancement device 3 is carefully designed and implemented. The device mainly includes two parts: one is a first sealing member 31 arranged between the inner wall of the outer sealing cavity 11 and the outer wall of the inner sealing cavity 12, which is used to enhance the sealing between the two cavities; the other is a second sealing member 32 arranged at the seam and port of the outer sealing cavity 11, which is used to prevent the outside air from penetrating into the sealing structure 1 through these weak points. In addition, the connection between the vacuum pump interface 2 and the inner sealing cavity 12 and the outer sealing cavity 11 is provided with a third sealing member 33 to ensure the sealing of the connection.

[0059] More specifically, the first sealing member 31 , the second sealing member 32 and the third sealing member 33 are O-rings in this embodiment.

[0060] Soft cable 6:

[0061] In the dual-chamber sealing technology system, the sealing performance of the flexible flat cable 6 plays a vital role in the overall sealing effect. In view of this, the present invention proposes the following technical solution to optimize the sealing design of the flexible flat cable 6. Specifically, the flexible flat cable 6 connects the core component 5 and leads the image signal of the core component 5 out of the sealing structure 1. On the lead-out path of the flexible flat cable 6, an inner sealing cavity 12 and an outer sealing cavity 11 are specially designed, both of which are equipped with double-sided sealing plates 61. The double-sided sealing plates 61 are provided with U-shaped notches for the flexible flat cable 6 to pass through smoothly.

[0062] Furthermore, to ensure the sealing effect, vacuum sealant is applied to the inner side of the U-shaped notch, and O-rings are installed on both sides of the notch to further enhance the sealing performance. In addition, the two double-sided sealing plates 61 are arranged vertically, so that the flexible flat cable 6 forms a tortuous path during the passage. This increases the passage length of the flexible flat cable 6 in the sealing structure 1, increases the complexity of the gas or liquid leakage path, and thus achieves an efficient sealing effect that fits tightly with the dual-chamber sealing structure 1.

[0063] In summary, the present invention ensures the stable operation of the internal components of the camera and prolongs the service life through double-sealed cavity design, multiple seal enhancement technology, weak pressure difference control, and high-precision manufacturing and material selection. At the same time, the release of gas molecules in a vacuum environment is reduced through polishing, further improving the stability and reliability of the structure.

[0064] The present embodiment provides a method for implementing refrigeration for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, and aims to ensure that the vacuum degree of the sealed chamber of the camera can be maintained for a long time and maintain the internal refrigeration effect of the refrigerated camera through the above-mentioned structure for maintaining the vacuum degree of the sealed chamber of the refrigerated camera for a long time. The specific working process is as follows:

[0065] S1. Perform glue sealing and curing treatment on the flexible flat cable 6 in the inner sealed cavity 12. After curing, perform vacuum operation on the inner sealed cavity 12, and then seal it tightly with an O-ring to ensure the airtightness of the cavity;

[0066] S2. After the flexible flat cable 6 of the outer sealed cavity 11 is also sealed and cured, the vacuumed and sealed inner sealed cavity 12 is firmly fixed to the sealing bottom plate by screws to ensure its stability and sealing;

[0067] S3. Install the outer sealed cavity 11 and perform a vacuum operation on it to ensure that a high vacuum state is achieved inside it;

[0068] S4. Use the vacuum nozzle to extract the residual gas in the cavity. The opening and closing of the vacuum nozzle is precisely controlled by the thread of the sealing plug, so as to effectively maintain the high vacuum state of the inner sealing cavity 12 and the outer sealing cavity 11;

[0069] S5. The vacuum degree of the outer sealed cavity 11 and the inner sealed cavity 12 is precisely controlled to ensure that the vacuum degree is maintained at 1.0×10 -6 At the same time, the pressure difference ratio between the inner sealed cavity 12 and the outer sealed cavity 11 is strictly regulated to be stable within 5 to ensure the normal operation and long-term stability of the equipment.

[0070] Specifically, the test data of the leak rate in the vacuum buffer area is as follows:

[0071] 1. Sealed cavity performance analysis:

[0072] Under normal temperature and atmospheric environment, the vacuum degree of the outer sealed cavity is maintained at approximately 1.0×10 -6 The inner sealed cavity is also maintained at approximately 1.0×10 -6 At this time, the pressure difference between the inner and outer sealed cavities is relatively small. The present invention controls the pressure difference ratio to be below 5, and the leakage rate of the sealed cavity is significantly reduced to 6.7×10 -10 Pa·L / s.

[0073] The gas molecules leaking from the inner sealed cavity will penetrate into the outer sealed cavity. Since the outer sealed cavity has a higher vacuum degree and excellent sealing performance, the pressure of the inner sealed cavity will be restored to 5.0×10 2 The time of Pa level is significantly extended, so that the service life of the equipment can reach more than 8 years.

[0074] 2. The influence of the inner sealing cavity pressure on the equipment performance:

[0075] Through the analysis of experimental data, it is found that when the pressure in the inner sealed cavity is restored to 5.0×10 2 Pa, it has a significant weakening effect on the cooling temperature of CMOS and other sensors. The weakening range is between 7-12℃.

[0076] Based on this observation, we determined that when the pressure of the inner sealed chamber reaches 5.0×10 2 This conclusion is of great significance for evaluating the performance of equipment and determining the maintenance cycle.

[0077] 3. Through experimental testing, the pressure difference ratio and leakage rate test data of the inner and outer sealing cavities are shown in the table below

[0078] Serial number Pressure difference ratio Measured leakage rate / (Pa·L / s) 1 1000 <![CDATA[4.3×10 -7 ]]> 2 100 <![CDATA[1.85×10 -7 ]]> 3 75 <![CDATA[5.4×10 -8 ]]> 4 50 <![CDATA[3.35×10 -8 ]]> 5 25 <![CDATA[4.5×10 -9 <!-- 6 -->]]> 6 10 <![CDATA[1.55×10 -9 ]]> 7 5 <![CDATA[6.7×10 -10 ]]>

[0079] It can be seen that as the pressure difference ratio decreases, the leakage rate of the sealed cavity decreases accordingly. At the same time, according to the actual working conditions, the minimum control value of the pressure difference ratio is 5. Therefore, the present invention uses a dual-cavity structure and controls the pressure difference ratio to be below 5, thereby achieving the optimal sealing cavity leakage rate and enhancing the sealing temperature control effect.

[0080] The advantages of the above method are its innovative structural design, precise control technology, flexible air extraction operation and the resulting long-term stability. The above advantages together ensure that the refrigerated camera can work stably in various environments and meet the needs of high precision and low temperature environment.

[0081] Further, with respect to the sealing of the flexible flat cable 6 in step S1, the present invention provides the following sealing solution:

[0082] 1) Fix the double-sided sealing plate 61 to the inner side of the corresponding position of the sealing glue cavity by screws, pass the flexible flat cable 6 through the double-sided sealing plate 61, where the double-sided sealing plate 61 is grooved into a U shape, and the silk-screen mark on the flexible flat cable 6 is aligned with the groove of the double-sided sealing plate 61 to ensure the accuracy and effectiveness of the sealing;

[0083] 2) Pour the vacuum sealant into the sealant cavity, and the amount of the sealant injected should be flush with the surface of the inner sealing cavity 12;

[0084] 3) Pass the U-shaped notch of the double-sided sealing plate 61 through the flexible flat cable 6 and fix it to the inner sealing cavity 12 with screws. Squeeze the sealant cavity and glue overflow. Wipe and remove the overflowed glue with a soft cloth;

[0085] 4) Use the same process to glue the flexible flat cable 6 onto the sealing bottom plate; wait for it to cure at room temperature for 24 hours before use;

[0086] 5) The flexible flat cable 6 of the outer sealed cavity 11 and the inner sealed cavity 12 is connected via a flexible flat cable 6 plug.

[0087] The above solution provides an efficient and reliable sealing solution for the flexible flat cable 6, which is intended to ensure that the vacuum degree of the sealed cavity of the refrigerated camera can be maintained for a long time, thereby ensuring the internal refrigeration effect and overall performance of the refrigerated camera.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time, characterized in that: include: A sealing structure (1), wherein the sealing structure (1) has an internal vacuum environment; A vacuum pump interface (2), the vacuum pump interface (2) being arranged on the sealing structure (1) and connected to an external vacuum pump to extract gas from the sealing structure (1) so as to form a vacuum environment inside the sealing structure (1); A sealing reinforcement device (3), the sealing reinforcement device (3) being arranged around a joint of the sealing structure (1); A refrigeration device (4) is thermally connected to the sealing structure (1).

2. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 1, characterized in that: The sealing structure (1) comprises an outer sealing cavity (11) and an inner sealing cavity (12), wherein the inner sealing cavity contains a plurality of core components (5), the outer sealing cavity (11) completely wraps around and is located outside the inner sealing cavity (12) to isolate the inner sealing cavity (12) from the outside air, and a vacuum buffer area is formed between the outer sealing cavity (11) and the inner sealing cavity (12) by a certain interval.

3. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 2, characterized in that: The sealing enhancement device (3) comprises a first sealing member (31) arranged between the inner wall of the outer sealing cavity (11) and the outer wall of the inner sealing cavity (12), and a second sealing member (32) arranged at the seam and the port of the outer sealing cavity (11).

4. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 3, characterized in that: The outer surface and inner surface of the inner sealed cavity (12) are polished or plated with a high reflectivity coating, and the inner surface of the outer sealed cavity (11) is polished.

5. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 4, characterized in that: A third sealing member (33) is provided at the connection between the vacuum pump interface (2) and the inner sealing cavity (12) and the outer sealing cavity (11).

6. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 5, characterized in that: The refrigeration device (4) comprises a cold source (41), a refrigerant circulation system (42) and a heat exchanger (43); the cold source (41) is located in the main body of the refrigeration device (4); the refrigerant circulation system (42) penetrates the inner sealed cavity (12) through a sealed pipe to transport the low-temperature refrigerant generated by the cold source (41) to the heat exchanger (43); the heat exchanger (43) contacts the inner wall of the inner sealed cavity (12) directly or through a heat-conducting element.

7. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 6, characterized in that: The heat exchanger (43) comprises a base (431), a copper heat pipe (432) and an aluminum alloy fin (433); the heat pipe passes through the aluminum fin and is vertically inserted into the base (431); an inlet and outlet water pipe (434) is provided below the heat pipe; a water circulation passage is provided inside the base (431) and the water circulation passage is connected to the inlet and outlet water pipe (434).

8. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 7, characterized in that: The flexible flat cable (6) is connected to the core component (5) and leads the image signal of the core component (5) out of the sealing structure (1); the inner sealing cavity and the outer sealing cavity located on the lead-out path of the flexible flat cable (6) are provided with double-sided sealing plates (61); the double-sided sealing plates (61) are provided with a U-shaped groove for the flexible flat cable (6) to pass through; the inner side of the U-shaped groove is coated with vacuum sealant and both sides of the U-shaped groove are sealed by O-rings.

9. The structure for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long time according to claim 8, characterized in that: The vacuum degree of the outer sealed cavity (11) and the inner sealed cavity (12) is controlled at 10 -6 Pa or above.

10. A method for achieving refrigeration for maintaining the vacuum degree of a sealed chamber of a refrigerated camera for a long period of time, characterized in that: The method comprises the following steps: S1. After the flexible flat cable (6) in the inner sealed cavity (12) is cured by the glue seal, it is vacuumed and sealed with an O-ring; S2. After the flexible flat cable (6) of the outer sealed cavity (11) is sealed and cured, the vacuumed and sealed inner sealed cavity (12) is fastened to the sealing bottom plate by screws; S3. Install the outer sealing cavity (11) and evacuate the cavity; S4. The suction nozzle is used to extract the gas in the cavity, and its opening and closing are achieved by screwing the thread of the sealing plug to maintain the vacuum state of the inner sealed cavity (12) and the outer sealed cavity (11); S5. Control the vacuum degree of the outer sealed cavity (11) and the inner sealed cavity (12) at 10 -6 pa and the pressure difference ratio between the inner sealed cavity (12) and the outer sealed cavity (11) is set to be less than 5.

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