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CN-121972469-A - Be used for refrigerating type infrared detector dewar inner chamber to fill exhaust cleaning device

CN121972469ACN 121972469 ACN121972469 ACN 121972469ACN-121972469-A

Abstract

The invention discloses cleaning equipment for charging and discharging air in a Dewar inner cavity of a refrigeration type infrared detector, and belongs to the technical field of refrigeration type infrared detector packaging. The device comprises a frame, inflation, exhaust, a mounting interface and a self-defining module, wherein the mounting interface is provided with a compression device capable of replacing an inflation and exhaust unit and a pressure sensor, so that the sealing adaptation of the multi-specification Dewar shell is realized, the exhaust unit is used for constructing a vacuum environment through a dry vacuum pump, the inflation unit can realize pressure multi-gear switching and pulse blowing, and the inflation unit and the pulse blowing are matched to form a blowing-pumping-replacement circulation process. The equipment carries the operation panel of PLC control, realizes clean full-flow automatic control, still can install custom module such as strong magnetism, electrostatic absorption, vibration and high temperature baking module additional, and various foreign matters are cleared away to the pertinence. The device has high cleaning efficiency and strong adaptability, can accurately control the cleanliness of the inner cavity of the Dewar, and effectively improves the production quality and the service life of the refrigeration type infrared detector.

Inventors

  • LUO KAIBIN
  • ZHANG FAN

Assignees

  • 宁波威远光电研究院有限公司

Dates

Publication Date
20260505
Application Date
20260318

Claims (9)

  1. 1. The device for cleaning the air inflation and exhaust of the Dewar inner cavity of the refrigeration type infrared detector is characterized by comprising an equipment rack module, an air inflation unit module, an air exhaust unit module, an installation interface module and a self-defining module; The mounting interface module comprises a sealing mounting unit, the sealing mounting unit comprises an air charging and discharging unit (6), a sealing rubber ring and a pressure facility (7), the pressure facility (7) is compression equipment controlled by a screw hand wheel at the top of the side edge, and the sealing rubber ring is matched with the pressure facility (7) to enable the Dewar shell (9) and the air charging and discharging unit (6) to form a sealing structure; The exhaust unit module comprises an exhaust pipeline, an exhaust switch, a dry vacuum pump (5), an exhaust valve (10) and an exhaust corrugated pipe (2), wherein the exhaust pipeline is connected with an exhaust charging unit (6) of the installation interface module through an exhaust charging pipeline, the exhaust switch controls the on-off of the exhaust pipeline, and the dry vacuum pump (5) is connected with the exhaust charging unit (6) through the exhaust corrugated pipe (2) and the exhaust valve (10) and provides a vacuum environment; The air charging unit module comprises an air charging pipeline, an air charging switch (1), a pressure regulating valve, an air charging stainless steel pipe (3) and an air charging valve (8), wherein the air charging switch (1) and the air charging valve (8) are connected with the air charging and discharging unit (6), the pressure regulating valve is connected with a nitrogen gas source through the air charging pipeline and the air charging stainless steel pipe (3), and the pressure regulating valve controls the air charging pressure.
  2. 2. The cleaning device for air charging and discharging of a Dewar inner cavity of a refrigeration type infrared detector according to claim 1, wherein the device frame module comprises a supporting unit and an outer-covered metal panel unit, the outer-covered metal panel unit comprises side plates (1201) on two sides of the device, a front panel (1202) and a top cover plate (1203) of the device, the frame supporting unit is spliced into an integral aluminum profile frame and is fixedly connected through a triangular fixed angle code matched fastening screw, and the outer-covered metal panel unit adopts an aluminum alloy plate structure and is fixedly arranged on the surface of the aluminum profile frame through screws; the device is applied to the packaging field of the refrigeration type infrared detector chip, and performs air charging and discharging cleaning treatment on the inner cavity of the Dewar shell (9) in the packaging stage.
  3. 3. The cleaning device for the air charging and discharging of the Dewar inner cavity of the refrigeration type infrared detector according to claim 1, wherein the air charging and discharging unit (6) is a replaceable unit, the bottom of the air charging and discharging unit (6) is a vacuum KF flange interface and is in sealing connection with an air suction valve (10) of an air suction unit through an O ring and a clamp, a sealing groove (601) is processed at the top of the air charging and discharging unit (6), the sealing groove (601) and the Dewar outer shell (9) are matched to form a sealing structure, and the sealing surface of the sealing groove (601) can be designed and adjusted according to different Dewar outer shells (9); an opening at one side of the air charging and discharging unit (6) is welded to lead out an air charging pipeline, one end of the air charging pipeline is connected with an air charging switch (1) through a metal quick plug, the other end of the air charging pipeline is concentric with the outer diameter of the air charging and discharging unit (6) and led out upwards, the tail end of the air charging and discharging unit is outwards opened to form an air charging tail end bell mouth (301), an air discharging flange (602) and an air discharging flange (603) are welded to the opening of the air charging and discharging unit (6), and the air discharging flange is connected with a vacuum valve and is used for discharging air and discharging air during air blowing.
  4. 4. A device for cleaning the inner cavity of a Dewar of a refrigerated infrared detector according to claim 3, wherein the air charging and discharging unit (6) is provided with a top adapting structure with multiple specifications, the rapid adaptation of different Dewar shells (9) is realized by changing the top adapting structure of the air charging and discharging unit (6), and the sealing fit between the Dewar shells (9) and the air charging and discharging unit (6) can be adjusted by changing a sealing ring in a sealing groove (601); the central position of the inflation tail end bell mouth (301) of the inflation and deflation unit (6) is a threaded interface type nozzle, and the inflation interface type and the inflation height position are adjusted by changing the nozzle, so that the punching air flow mode is changed.
  5. 5. The cleaning device for the air charging and discharging of the inner cavity of the Dewar of the refrigeration type infrared detector according to claim 1, wherein an air charging interface of the air charging unit module is communicated with a nitrogen gas source, a pressure regulating valve realizes the switching between high, middle and low three-gear of the air blowing pressure, an electrostatic dust collection device is arranged at the front end of the air charging interface to realize the air source cleaning, and the air charging air flow blows outwards from the bottom of the inner cavity of the Dewar shell (9).
  6. 6. The cleaning device for the air charging and discharging of the Dewar inner cavity of the refrigeration type infrared detector according to claim 1, wherein all switch valves of the device are electric switch valves, an operation control panel (11) is arranged at a top cover plate (1203) of a device frame module, and the electric switch valves are integrated on an electronic control screen of the operation control panel (11) through a PLC, so that automatic control of a pipeline valve switch and a pump set air source is realized; the air source valve of the air charging unit module is an electric regulating valve, and can automatically set an air charging pressure mode, so that high, medium and low pressure automatic switching or a pulse air blowing mode is realized.
  7. 7. The device for cooling and air charging and discharging the inner cavity of the infrared detector dewar according to claim 1, wherein the custom-made module comprises one of a strong magnetic module, an electrostatic adsorption module and a vibration module, the strong magnetic module is used for removing metal particles in the inner cavity of the dewar shell (9), the electrostatic adsorption module is used for removing dust in the inner cavity, and the vibration module is used for desorbing particles attached to the inner wall of the cavity.
  8. 8. The device for cooling the inner cavity of the infrared detector dewar for air charging and discharging cleaning according to claim 1, wherein the pressure facility (7) comprises a screw hand wheel (701), a guide rail (702) and an upper pressing plate (703), the upper pressing plate (703) is limited on the guide rail (702), and the upper pressing plate (703) is controlled to move up and down along the guide rail (702) through the screw hand wheel (701); the pressure facility (7) is provided with a pressure sensor, and the compressing force is automatically adjusted by receiving a feedback signal of the pressure sensor, so that high vacuum sealing between the Dewar shell (9) and the air charging and discharging unit (6) is realized.
  9. 9. The device for cleaning the inner cavity of the Dewar of the refrigerated infrared detector according to claim 3, wherein the mounting interface is adapted to the Dewar shell in various forms for air filling and air discharging cleaning by changing the specifications of the sealing interface and the sealing rubber ring.

Description

Be used for refrigerating type infrared detector dewar inner chamber to fill exhaust cleaning device Technical Field The invention relates to the field of encapsulation of refrigeration type infrared detectors, in particular to a cleaning device for charging and discharging air in a Dewar inner cavity of the refrigeration type infrared detector, Background The refrigeration type infrared detector is a high-end device in the infrared detection field, is widely used in multiple scenes such as military side sea defense monitoring, missile guidance, civil gas detection, forest fire protection and the like by virtue of the characteristics of high detection sensitivity and excellent imaging resolution, and is a core component for realizing accurate detection of the equipment. The Dewar tube shell packaging is a mainstream packaging mode of the refrigeration type infrared detector, the cleanliness of the interior of the Dewar tube shell directly influences the imaging effect, the use stability and the service life of the detector, and is a key handle control index of the detector packaging. In the production process of the refrigeration type infrared detector, foreign matters such as metal scraps, fine dust particles, fiber burrs and the like are inevitably prevented from entering the inside of the tube shell even if the process is operated in a dust-free workshop in the links of processing, assembling and storing the Dewar tube shell. And after the Dewar tube shell is welded and molded, the internal structure is complex, a plurality of narrow gaps and dead angles exist, once foreign matters enter, the foreign matters are difficult to thoroughly clean, and residual metal scraps easily cause short circuit of leads inside the tube shell. Meanwhile, because the Dewar tube shell needs to provide a high-vacuum working environment for the detector chip, the Dewar tube shell is limited by the use requirement, and cannot be cleaned by a solvent, so that the interior foreign matters can only be cleaned by manual wiping, ordinary normal-pressure gas purging and other cleaning modes commonly used in the industry at present, and the large-particle foreign matters on the interior surface of the tube shell can not be effectively cleaned at all for tiny foreign matters hidden in gaps and dead angles, so that foreign matters are extremely easy to remain. At present, no special cleaning equipment for the inner cavity of the Dewar tube shell of the refrigeration type infrared detector is available in the market, the existing general gas purging equipment has the problems that the pressure adjusting precision is low, the blowing mode is single, the blowing operation and the air suction operation cannot be realized simultaneously, the suitability is poor and the like, the cleaning cannot be carried out according to Dewar tube shells of different specifications, the cleaning process and the cleanliness of the inner cavity of the cleaned tube shell cannot be monitored in real time, and the packaging requirement of the refrigeration type infrared detector on the high cleanliness of the Dewar tube shells cannot be met at all. Therefore, research and development of a special air charging and discharging cleaning device for the Dewar inner cavity of the refrigeration type infrared detector solves the problem that foreign matters in the Dewar tube shell inner cavity are difficult to thoroughly remove, and has become an urgent need for improving the production quality of the refrigeration type infrared detector. Disclosure of Invention The invention provides a cleaning device for filling and exhausting of a Dewar inner cavity of a refrigeration type infrared detector, which aims to solve the technical problem that foreign matters in the Dewar inner cavity of a Dewar tube shell are difficult to thoroughly clean. The invention adopts the following technical scheme that the cleaning equipment for the ventilation of the inner cavity of the Dewar of the refrigeration type infrared detector comprises an equipment frame which comprises a plurality of supporting units and an outer-covered metal panel unit. The frame support unit module is an aluminum profile or support bar structure with three lengths, and has stronger structural rigidity. The frame support unit covers the whole aluminum profile frame and is fixedly connected through the triangular fixed corner fitting fastening screw. The outer-covered metal panel unit adopts an aluminum alloy plate structure, and surface holes are formed in the surface of the aluminum profile frame through screws and are fixed on the surface of the aluminum profile frame. The installation interface module comprises a plurality of seal installation units, the seal installation units comprise an air charging and discharging unit assembled by the top and the Dewar shell in a matched mode, and sealing rubber rings used in a matched mode and intelligent pressing equipment controlled by a side top hand wheel ensure that