Redundant object prevention cold shield exhaust groove
By designing a barbed structure in the cold screen exhaust tank to form an S-shaped exhaust passage, the problem of excess invasion into the cold screen is solved, the probability of excess being blocked is improved, and the imaging quality of the infrared detector is protected.
Patent Information
- Application Number
- CN202422105949.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The existing cold screen exhaust hole structure easily allows excess to invade the cold screen during exhaust, resulting in abnormal imaging of infrared detectors.
A rectangular cold screen exhaust groove with a barb structure is designed. The barb structure includes a barb tip, a barb and a barb trunk, which is distributed intertwinedly on both sides of the groove body to form an S-shaped exhaust passage to extend the invasion path of the excess and effectively block its entry.
While not hindering the exhaust of gas, it effectively extends the path of excess invasion, increases the probability of excess being blocked, prevents it from entering the cold screen, thereby protecting the overall performance of the infrared detector.
Smart Images
Figure CN223050737U_ABST
Abstract
Description
Technical Field
[0001] The utility model mainly relates to the technical field of exhaust grooves, and particularly relates to an anti-redundant cold shield exhaust groove. Background Art
[0002] An infrared detector is a device that converts an incident infrared radiation signal into an electrical signal output. Such a detector mainly utilizes the different intensities of infrared radiation generated by objects due to different temperatures, and identifies objects by detecting this radiation. It has the characteristics of passive detection, high detection accuracy, and strong environmental adaptability, and is widely used in military and civilian fields, including but not limited to early warning detection, intelligence reconnaissance, precision strike, night vision, astronomical observation, gas detection, fire warning, climate and meteorological information collection, safety production monitoring and other fields.
[0003] As one of the important parts of a refrigerated infrared detector, a cold shield has the functions of restricting the field of view angle, suppressing background radiation and stray light. The exhaust holes on the cold shield can exhaust the internal gas of the cold shield during high-temperature exhaust, providing a high-vacuum and low-temperature environment for the normal operation of the detector focal plane. The existing cold shield exhaust hole structure is usually a single rectangular or circular structure. Although this structure can quickly exhaust the internal gas of the cold shield, in the actual use process, the redundant substances in the Dewar will invade the cold shield through these exhaust holes, resulting in abnormal imaging of the infrared detector. Therefore, it is particularly important to prevent redundant substances from invading the cold shield while ensuring effective exhaust. Summary of the Utility Model
[0004] The utility model mainly provides an anti-redundant cold shield exhaust groove to solve the technical problems raised in the above background art.
[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:
[0006] A cold shield exhaust groove with an anti-redundant function, which includes a cold shield exhaust groove body. The cold shield exhaust groove is located at the top of the cold shield, the groove body is rectangular, and a barb structure for preventing redundant substances from invading is arranged in the groove body;
[0007] The barb structure includes a barb tip, a barb hook and a barb main body;
[0008] The barb structure is distributed in a staggered manner on both sides of the groove body in turn, providing an S-shaped exhaust passage for the smooth discharge of the internal gas of the cold shield for the cold shield exhaust groove.
[0009] Further, the direction of the barb tips of the barb structure is along the direction of gas discharge in the S-shaped exhaust passage.
[0010] Further, the barb tips of the barb structure are distributed on the left and right sides of the center line of the cold shield exhaust groove in turn.
[0011] Further, the included angle between the barb of the barb structure and the barb main body on the same side is greater than 0° and less than or equal to 90°.
[0012] Further, the included angle between the barb main body of the barb structure and the side wall of the cold shield exhaust groove is greater than 0° and less than or equal to 90°.
[0013] Further, there are at least two barb structures.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] The cold shield exhaust groove of the present utility model has a barb structure, which transforms the original single straight exhaust passage into an S-shaped exhaust passage. While not hindering the gas discharge, it effectively extends the path length of foreign matter intrusion, greatly increasing the probability of foreign matter being blocked by the barb structure; the barb structure can also effectively collect and fix the foreign matter that has invaded the S-shaped exhaust passage, preventing it from further invading the inside of the cold shield and thus affecting the overall performance of the device.
[0016] The present utility model has the characteristic of wide application range. For different cold shield styles, the present utility model can be realized by changing the groove body length and appropriately reducing the number of barb structures; for the same cold shield, the present utility model can be compatible with filter plates of different diameters, reducing the production cost.
[0017] Hereinafter, the present utility model will be explained and illustrated in detail in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is the overall top view of the cold shield exhaust groove for preventing foreign matter.
[0019] Figure 2 It is the schematic diagram of the cold shield exhaust groove for preventing foreign matter.
[0020] Figure 3 It is the schematic diagram of the size range of the filter plate that the cold shield exhaust groove for preventing foreign matter can be compatible with.
[0021] Figure 4 It is the partial enlarged view of the cold shield exhaust groove for preventing foreign matter.
[0022] In the figure: 1. Cold shield exhaust groove for preventing foreign matter; 2. Cold shield; 3. Cold shield light passing hole step; 4. Exhaust passage and exhaust direction; 5. Maximum applicable diameter filter plate; 6. Minimum applicable diameter filter plate; 11. Groove body; 12. Barb structure; 121. Barb tip; 122. Barb; 123. Barb main body. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.
[0024] It should be noted that when an element is referred to as "fixedly provided on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0026] Embodiment 1
[0027] As Figure 1 , an anti-debris cold shield exhaust groove 1 is provided in an embodiment of the present utility model, including a cold shield exhaust groove body 11, located on the upper end surface of the cold shield 2. The groove body is rectangular and communicates with the cold shield light-transmitting hole step 3.
[0028] As Figure 2 , the cold shield exhaust groove 1 further includes a barbed structure 12, barbed tips 121, barbs 122 and a barbed main trunk 123. The barbed structures 12 are evenly distributed in a staggered manner on both sides of the groove body 11. The 7 barbed structures 12 provide an S-shaped exhaust passage 4 for the smooth discharge of the gas inside the cold shield. The exhaust diameter of the S-shaped exhaust passage 4 is 29% of the original single straight-line exhaust passage, which can effectively block large-sized debris outside. In addition, while not affecting the gas discharge efficiency, the S-shaped exhaust passage 4 can effectively extend the intrusion path of the debris, greatly increasing the probability of the debris being blocked by the barbed structure 12.
[0029] The direction of the tip 121 of the barb is along the direction of gas discharge in the S-shaped exhaust passage 4. The angle between the barb 122 and the barb main stem 123 on the same side is equal to 90°. The angle between the barb main stem 123 and the side wall of the groove body 11 is 51°. The barb structure 12 can effectively accumulate the intruding foreign matters between the barb main stem 123 and the side wall of the groove body 11. When the foreign matters accumulated between the barb main stem 123 and the side wall of the groove body 11 move due to vibration or other reasons, the barb 122 can block the movement of the foreign matters to prevent them from further intruding into the cold shield. If the number of foreign matters exceeds the blocking limit of one barb structure 12, the excess foreign matters will be blocked by the next barb structure 12. This is the significance of setting multiple barb structures 12.
[0030] As Figure 3 , the cold shield exhaust groove 1 can be compatible with filter plates of different diameters within a certain range (the largest diameter filter plate 5, the smallest diameter filter plate 6), which can, to a certain extent, solve the problem of poor material interchangeability in the actual production process, improve the resource utilization rate, and reduce the production cost.
[0031] Embodiment 2
[0032] As Figure 4 , the embodiment of the present utility model provides a cold shield exhaust groove 1 for preventing foreign matters, which includes a cold shield exhaust groove body 11 located on the upper end surface of the cold shield 2. The groove body is rectangular and communicates with the cold shield light passing hole step 3. The barb structures 12 are evenly distributed in a staggered manner on both sides of the groove body 11. The 12 barb structures 12 provide an S-shaped exhaust passage 4 for the smooth discharge of the gas inside the cold shield. The exhaust diameter of the S-shaped exhaust passage 4 is 20% of the original single straight-line exhaust passage, which can effectively block large-size foreign matters outside. In addition, while not affecting the gas discharge efficiency, the S-shaped exhaust passage 4 can effectively extend the intrusion path of the foreign matters, greatly increasing the probability of the foreign matters being blocked by the barb structures 12.
[0033] The direction of the tip 121 of the barb is along the direction of gas discharge in the S-shaped exhaust passage 4. The angle between the barb 122 and the barb main stem 123 on the same side is equal to 60°. The angle between the barb main stem 123 and the side wall of the groove body 11 is 70°. The foreign matters are blocked jointly by the 12 barb structures 12. The cold shield exhaust groove 1 can be compatible with filter plates of different diameters within a certain range (the applicable largest diameter filter plate 5, the applicable smallest diameter filter plate 6), which can, to a certain extent, solve the problem of poor material interchangeability in the actual production process, improve the resource utilization rate, and reduce the production cost.
[0034] Embodiment 3
[0035] As Figure 4The embodiment of the utility model provides an anti-waste cold shield exhaust groove 1, including a cold shield exhaust groove body 11, which is located on the upper end surface of the cold shield 2, and the groove body is rectangular and communicates with the cold shield light hole step 3. The barb structures 12 are staggered on both sides of the groove body 11. The 11 barb structures 12 provide the cold shield exhaust groove with an S-shaped exhaust passage 4 for smooth exhaust of the internal gas of the cold shield. The exhaust diameter of the S-shaped exhaust passage 4 is smaller than the original single linear exhaust passage, and can effectively block large-sized waste. In addition, the S-shaped exhaust passage 4 can effectively extend the invasion path of waste without affecting the gas exhaust efficiency, greatly increasing the probability of waste being blocked by the barb structure 12.
[0036] The barb structure 12 is composed of two different structures, one is a barb structure in which the angle between the barb 122 and the barb trunk 123 on the same side is equal to 90°, and the angle between the barb trunk 123 and the side wall of the groove body 11 is 51°, and the other is a barb structure in which the angle between the barb 122 and the barb trunk 123 on the same side is equal to 60°, and the angle between the barb trunk 123 and the side wall of the groove body 11 is 70°. The direction of the barb tip 121 is along the direction of gas discharge in the S-shaped exhaust passage 4. Excess matter is blocked by 11 barb structures together.
[0037] Preferably, multiple barb structures 12 can be scientifically arranged and combined according to the design requirements of the infrared detector, the optional range of the angle between the barb 122 and the barb trunk 123 on the same side is greater than 0° and less than or equal to 90°, the optional range of the angle between the barb trunk 123 and the side wall of the slot body 11 is greater than 0° and less than or equal to 90°, and the distance between adjacent barb structures 12 can be designed according to the use requirements of the infrared detector, but the design of the distance must be adapted to the angle between the two places and must not cause blockage of the S-shaped exhaust passage. The combined use of barb structures 12 with different numbers, different angles, and different spacings can effectively deal with the intrusion of redundant objects.
[0038] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.
Claims
1. An anti-waste cold shield exhaust slot, comprising a cold shield (2) exhaust slot body, characterized in that: The exhaust slot of the cold shield (2) is located at the top of the cold shield (2), the slot body (11) is rectangular, and a barb structure (12) is provided in the slot body (11) for preventing the intrusion of excess objects; The barb structure (12) comprises a barb tip (121), a barb (122) and a barb trunk; The barb structures (12) are distributed in a staggered manner on both sides of the slot body (11), providing an S-shaped exhaust passage for the exhaust slot of the cold screen (2) through which the gas inside the cold screen (2) can be discharged smoothly.
2. The anti-waste cold shield exhaust slot according to claim 1, characterized in that: The barb tip (121) of the barb structure (12) is directed along the direction in which gas is discharged from the S-shaped exhaust passage.
3. The anti-waste cold shield exhaust slot according to claim 1, characterized in that: The barb tips (121) of the barb structure (12) are sequentially distributed on the left and right sides of the center line of the exhaust groove of the cold shield (2).
4. The anti-waste cold shield exhaust slot according to claim 1, characterized in that: The included angle between the barb (122) of the barb structure (12) and the barb trunk on the same side is greater than 0° and less than or equal to 90°.
5. The anti-waste cold shield exhaust slot according to claim 1, characterized in that: The included angle between the main barb of the barb structure (12) and the side wall of the exhaust groove of the cold shield (2) is greater than 0° and less than or equal to 90°.
6. The anti-waste cold shield exhaust slot according to claim 1, characterized in that: The barb structures (12) have at least two in number.