CN109351079B - Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device - Google Patents

Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device Download PDF

Info

Publication number
CN109351079B
CN109351079B CN201811317273.3A CN201811317273A CN109351079B CN 109351079 B CN109351079 B CN 109351079B CN 201811317273 A CN201811317273 A CN 201811317273A CN 109351079 B CN109351079 B CN 109351079B
Authority
CN
China
Prior art keywords
filter screen
welding
air inlet
cover plate
infrared detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811317273.3A
Other languages
Chinese (zh)
Other versions
CN109351079A (en
Inventor
沈一璋
王小坤
孙闻
俞君
张磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Institute of Technical Physics of CAS
Original Assignee
Shanghai Institute of Technical Physics of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Institute of Technical Physics of CAS filed Critical Shanghai Institute of Technical Physics of CAS
Priority to CN201811317273.3A priority Critical patent/CN109351079B/en
Publication of CN109351079A publication Critical patent/CN109351079A/en
Application granted granted Critical
Publication of CN109351079B publication Critical patent/CN109351079B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/106—Ring-shaped filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Drying Of Gases (AREA)

Abstract

The invention discloses a pollution isolation device for an infrared detector dewar assembly after being communicated with atmosphere. The device for isolating pollution after the opening of the infrared detector Dewar component for deflation mainly comprises an air outlet joint, an air outlet cover plate, a filter screen upper pressing plate, an air outlet filter screen, a filter screen lower pressing plate, a drying agent placing frame, a dust filter screen, a porous vent pipe, a shell, an air inlet filter screen, a filter screen pressing ring, an air inlet joint, an air inlet cover plate and a drying agent. The infrared detector Dewar assembly has a simple, reliable and effective structure, solves the problem that dust and water vapor are mixed into the assembly when the infrared detector Dewar assembly is subjected to tube opening and air bleeding operation, and has the function of protecting the assembly detector from pollution.

Description

Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device
Technical Field
The invention relates to an infrared detector Dewar assembly technology, in particular to a device which is arranged at an exhaust port of an infrared detector Dewar assembly after the infrared detector assembly is communicated with the atmosphere and is used for filtering and isolating dust and water vapor.
Background
The refrigeration type infrared detector assembly is widely applied to the field of aerospace infrared, and the performance of the infrared detector assembly is an important technical index of the high-spatial-resolution infrared remote sensing instrument. At present, the infrared detector assembly in a vacuum packaging state needs to be subjected to tube opening and air bleeding operation before launching, so that the assembly can maintain the vacuum state of the assembly in space by depending on the vacuum environment of the space. At present, the inside of the component is completely exposed to the atmospheric environment during the period from the opening of the tube to the emission, and dust and moisture in the environment are mixed into the inside of the component during the period. These impurities will adsorb on the detector surface at the cold end when the assembly is cold, which will greatly affect the performance. Meanwhile, the longer the component is exposed to the atmospheric environment, the more dust and moisture are mixed in the component, and the pollutants are difficult to remove from the interior of the component, and in serious cases, the high-spatial-resolution infrared remote sensing instrument can even fail.
In order to avoid pollution of dust, water vapor and the like, two methods are generally adopted when the pipe opening operation is carried out at present, firstly, the time interval from the pipe opening of the assembly to the emission is shortened, the time for exposing the inside to the atmosphere is reduced, and thus the water vapor and the dust entering the inside of the assembly are also reduced. Secondly, after the component is opened, the opening of the pipe is wrapped by a dust filter screen to prevent dust from entering the component. The method I can shorten the time of exposing the internal detector to the atmosphere, but is limited by other planned time nodes of the satellite during actual operation, so that the time is difficult to control; the second method can prevent the invasion of dust, but cannot prevent the invasion of moisture.
Disclosure of Invention
The invention aims to provide a pollution isolation device for an infrared detector Dewar component after being communicated with atmosphere, which solves the problem that when the infrared detector Dewar component is opened from a vacuum state and returns to normal pressure, foreign matters and dust are sucked into the component due to negative pressure, so that the performance of the detector is influenced; meanwhile, the deliquescence influence on the detector caused by the intrusion of water vapor in the atmosphere is reduced.
The structure of the invention is shown in figure 1, which comprises: the air outlet joint comprises an air outlet joint 1, an air outlet cover plate 2, a filter screen upper pressing plate 3, an air outlet filter screen 4, a filter screen lower pressing plate 5, a drying agent placing frame 6, a dust filter screen 7, a porous vent pipe 8, a shell 9, an air inlet filter screen 10, a filter screen pressing ring 11, an air inlet joint 12, an air inlet cover plate 13 and a drying agent 14.
The method is characterized in that: a welding boss I1-1 of an air outlet joint 1 and a welding boss III 2-2 of an air outlet cover plate 2 are welded into a whole by laser, a welding boss V12-1 of an air inlet joint 12 and a welding boss V13-3 of an air inlet cover plate 13 are welded into a whole by laser, a welding assembly surface 8-2 of a porous vent pipe 8 and a welding boss V13-2 of the air inlet cover plate 13 are welded into a whole by laser, a dust filter screen 7 is sleeved outside a cylinder of the porous vent pipe 8 and is connected into a whole by glue, an air inlet filter screen 10 is arranged between a drying agent placing frame 6 and a filter screen compression ring 11, an assembly welding position 6-2 of the drying agent placing frame 6 and an assembly through hole 11-1 of the filter screen compression ring 11 are welded into a whole by laser, a drying agent 14 is arranged between a shell 9 and the drying agent placing frame 6, an air outlet filter screen 4, the welding boss IV 8-1 of the porous vent pipe 8 and the welding mounting hole 3-1 of the filter screen upper pressure plate 3 are welded into a whole by laser welding, and the shell 9, the welding boss II 2-1 of the air outlet cover plate 2 and the welding boss VI 13-1 of the air inlet cover plate 13 are welded into a whole by laser welding.
The air outlet joint 1 is made of stainless steel and is cylindrical. One side is a welding boss I1-1, the other side is an M6 standard threaded joint, and a circular vent hole is formed in the center of the cylinder.
The air outlet cover plate 2 is made of stainless steel and is in a circular sheet shape, one side of the air outlet cover plate is provided with a welding boss II 2-1, the other side of the air outlet cover plate is provided with a welding boss III 2-2, and the center of the air outlet cover plate is provided with a circular vent hole.
The filter screen upper pressure plate 3 is made of stainless steel and is in a circular sheet shape, a welding mounting hole 3-1 is formed in the center, and 12-18 circular vent holes are uniformly distributed in the periphery.
The air outlet filter screen 4 is made of red copper or stainless steel, is in the shape of a circular thin sheet, has the thickness of 0.2-0.3mm and the mesh number of 100-150.
The filter screen lower pressing plate 5 is made of stainless steel and is in a circular sheet shape, an assembly through hole I5-1 is formed in the center, and 12-18 circular vent holes are uniformly distributed in the periphery.
The desiccant placing frame 6 is made of stainless steel and is cylindrical, an assembly through hole II 6-1 is formed in the top of the desiccant placing frame, an assembly welding position 6-2 is formed in the bottom of the desiccant placing frame, and 12-18 circular vent holes are uniformly distributed in the lower portion of the cylinder.
The dust filter screen 7 is made of red copper or stainless steel, is cylindrical, has a thickness of 0.2-0.3mm and a mesh number of 200-250.
The porous vent pipe 8 is made of stainless steel and is cylindrical, the top of the porous vent pipe is provided with a welding boss four 8-1, 55-70 circular air inlets are formed around the cylinder body, and the bottom of the porous vent pipe is provided with a welding assembly surface 8-2.
The shell 9 is made of stainless steel and is cylindrical;
the material of the air inlet filter screen 10 is stainless steel or red copper, and the air inlet filter screen is a circular ring-shaped sheet, the thickness is 0.2-0.3mm, and the mesh number is 100-150.
The filter screen compression ring 11 is made of stainless steel and is in a circular sheet shape, an assembly through hole 11-1 is formed in the middle of the filter screen compression ring, and 12-18 circular air inlets are uniformly distributed in the periphery of the filter screen compression ring.
The air inlet joint 12 is made of stainless steel and is cylindrical, one side of the air inlet joint is provided with a welding boss five 12-1, the other side of the air inlet joint is provided with an M6 standard threaded joint, and the center of the cylinder is provided with a circular vent hole.
The air inlet cover plate 13 is made of stainless steel and is in a circular sheet shape, one side of the air inlet cover plate is provided with a welding boss six 13-1, the welding boss six 13-1 is arranged in the middle of the air inlet cover plate, a welding boss seven 13-2 is arranged in the middle of the air inlet cover plate, the welding boss eight 13-3 is arranged in the middle of the air inlet cover plate, and a circular vent hole is formed in the middle of the air inlet cover plate.
The drying agent 14 is a fine-pore silica gel drying agent, is spherical particles, has the diameter of 2-3mm, the pore diameter of 2-3nm and the specific surface area of 600-650m2G, adsorption amount: and the RH is 28 to 32 percent when the RH is 90.
The structure of the pollution isolation device provided by the invention is realized by the following steps:
1. firstly, welding a fifth welding boss 12-1 of the air inlet joint 12 and an eighth welding boss 13-3 of the air inlet cover plate 13 into a whole through laser welding, then welding a welding assembly surface 8-2 of the porous vent pipe 8 and a seventh welding boss 13-2 of the air inlet cover plate 13 into a whole through laser welding, then sleeving the dust filter screen 7 on the outer side of the porous vent pipe 8, and connecting the dust filter screen and the porous vent pipe into a whole through glue joint.
2. An air inlet filter screen 10 is arranged at the bottom of a drying agent placing frame 6, a filter screen press ring 11 is arranged on the air inlet filter screen 10, and an assembling welding position 6-2 of the drying agent placing frame 6 and an assembling through hole 11-1 of the filter screen press ring 11 are welded into a whole through laser.
3. The shell 9 and a welding boss six 13-1 of the air inlet cover plate 13 are welded into a whole through laser, and then the assembly through hole two 6-1 of the desiccant placing frame 6 is arranged on the welding boss four 8-1 of the porous vent pipe 8.
4. The desiccant 14 is placed in position between the desiccant holder 6 and the housing 9.
5. The assembling through hole I5-1 of the filter screen lower pressing plate 5 is arranged on a welding boss IV 8-1 of the porous vent pipe 8, the air outlet filter screen 4 is arranged on the welding boss IV 8-1 of the porous vent pipe 8, and the welding mounting hole 3-1 of the filter screen upper pressing plate 3 is arranged on the mounting position of the porous vent pipe 8 and is welded with the welding boss IV 8-1 of the porous vent pipe 8 into a whole through laser.
6. Welding a first welding boss 1-1 of the air outlet joint 1 and a third welding boss 2-2 of the air outlet cover plate 2 into a whole through laser welding, and then welding a second welding boss 2-1 of the air outlet cover plate 2 and the shell 9 into a whole through laser welding.
The principle of the invention is as follows:
the device connects at dewar subassembly exhaust pipe mouth, and when the dewar subassembly of vacuum state went on out the pipe gassing operation, external atmosphere got into from the air inlet, and the dust was blockked by the filter screen when passing through the filter screen, and by drier adsorption of water vapour during rethread desiccator is regional, inside pure gaseous entering subassembly at last.
The invention has the advantages that:
1. the invention has simple structure, convenient operation and low cost.
2. The invention can realize the functions of dust prevention and water vapor prevention.
3. The invention has the function of preventing water vapor and dust from entering the cavity of the Dewar component and protecting the internal detector when the cavity of the Dewar component is communicated with the atmosphere.
Drawings
FIG. 1 is a schematic view of a pollution isolation device;
in the figure:
1-air outlet joint;
1-welding a first boss;
2-air outlet cover plate;
3, pressing a filter screen;
4, an air outlet filter screen;
5, pressing a filter screen;
6, placing a drying agent rack;
7-dust filter screen;
8-a porous vent pipe;
9-a housing;
10-air inlet filter screen;
11-filter screen compression ring;
12-air inlet connection;
12-1-welding a boss five;
13-air inlet cover plate;
14-a drying agent;
FIG. 2 is a schematic view of a vent cover plate;
in the figure:
2-1-welding a second boss;
2-welding a boss III;
FIG. 3 is a schematic view of a screen top press plate;
in the figure:
3-1-welding the mounting hole;
FIG. 4 is a schematic view of a screen hold-down plate;
in the figure:
5-1, assembling a first through hole;
FIG. 5 is a schematic view of a desiccant placement rack;
in the figure:
6-1, assembling a second through hole;
6-2-assembling and welding positions;
FIG. 6 is a schematic view of a porous vent tube;
in the figure:
8-1-welding and assembling a boss IV;
8-2-welding the assembly surface;
FIG. 7 is a schematic view of a filter screen compression ring;
in the figure:
11-1-assembly through hole;
FIG. 8 is a schematic view of an inlet cover plate.
In the figure:
13-1-welding a boss six;
13-2-welding a boss seven;
13-3-welding boss eight.
Detailed Description
The following detailed description of the embodiments of the present patent will be made with reference to the accompanying drawings, as shown in fig. 1, and the main implementation method thereof is as follows:
1. firstly, polishing the air inlet joint 12 and the air inlet cover plate 13, then ultrasonically cleaning the air inlet joint by using acetone and alcohol, then assembling the welding boss five 12-1 of the air inlet joint 12 and the welding boss eight 13-3 of the air inlet cover plate 13, and welding the air inlet joint 12 and the air inlet cover plate into a whole by laser.
2. Polishing the porous vent pipe 8, and ultrasonically cleaning the porous vent pipe by using acetone and alcohol; the dust filter screen 7 is made of stainless steel, the thickness of the dust filter screen is 0.2mm, the mesh number of the dust filter screen is 250, the dust filter screen 7 is cleaned by acetone and alcohol in an ultrasonic mode, and then the dust filter screen 7 is sleeved on the outer wall of the cylinder of the porous vent pipe 8 and is glued together.
3. The welding assembly surface 8-2 of the porous vent pipe 8 and the welding boss seven 13-2 of the air inlet cover plate 13 are assembled and welded into a whole through laser.
4. Polishing the shell 9, ultrasonically cleaning the shell by using acetone and alcohol, assembling the cylindrical end surface on one side of the shell 9 and a welding assembly boss six 13-1 of the air inlet cover plate 13, and welding the end surface and the welding assembly boss six 13-1 into a whole by laser.
5. Polishing the drying agent placing frame 6 and the filter screen compression ring 11, and ultrasonically cleaning the drying agent placing frame and the filter screen compression ring by using acetone and alcohol; the air inlet filter screen 10 is made of stainless steel materials, the thickness of the air inlet filter screen 10 is 0.2mm, the mesh number of the air inlet filter screen 10 is 150, the air inlet filter screen 10 is cleaned by acetone and alcohol in an ultrasonic mode, the air inlet filter screen 10, the assembly through hole 11-1 of the filter screen compression ring 11 and the assembly welding position 602 of the drying agent placing frame 6 are sequentially assembled and welded into a whole through laser, and then the assembly through hole two 6-1 of the drying agent placing frame 6 and the welding boss four 8-1 of the porous vent pipe 8 are assembled.
6. The desiccant 14 is selected from fine-pore silica gel desiccant, and is in the shape of spherical granule with diameter of 2mm, aperture of 2nm, and specific surface area of 650m2G, adsorption amount: when RH is 90%, 30%, the desiccant 14 is placed in a storage position between the desiccant placement frame 6 and the housing 9.
7. Polishing the filter screen upper pressing plate 3 and the filter screen lower pressing plate 5, and ultrasonically cleaning the filter screen upper pressing plate and the filter screen lower pressing plate by using acetone and alcohol; the air outlet filter screen 4 is made of stainless steel materials, the thickness is 0.2mm, the mesh number is 150, and the air outlet filter screen 4 is cleaned by acetone and alcohol in an ultrasonic mode; then, the assembly through hole I5-1 of the filter screen lower pressing plate 5, the air outlet filter screen 4 and the welding installation hole 3-1 of the filter screen upper pressing plate 3 are sequentially assembled with the welding assembly boss IV 8-1 of the porous vent pipe 8 and are welded into a whole through laser.
8. Polishing the gas outlet joint 1 and the gas outlet cover plate 2, ultrasonically cleaning the gas outlet joint 1 and the gas outlet cover plate 2 by using acetone and alcohol, assembling the welding boss I1-1 of the gas outlet joint 1 and the welding boss III 2-2 of the gas outlet cover plate 2, and welding the gas outlet joint 1 and the gas outlet cover plate 2 into a whole by laser.
9. And assembling the welding boss II 2-1 of the air outlet cover plate 2 and the cylindrical end surface on the other side of the shell 9, and welding the two into a whole by laser.

Claims (10)

1. An infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device includes: gas outlet connects (1), gas outlet apron (2), filter screen top board (3), gas outlet filter screen (4), filter screen holding down plate (5), drier rack (6), dust filter screen (7), porous breather pipe (8), shell (9), air inlet filter screen (10), filter screen clamping ring (11), air inlet joint (12), air inlet apron (13), drier (14), its characterized in that:
the welding boss I (1-1) of the air outlet connector (1) and the welding boss III (2-2) of the air outlet cover plate (2) are welded into a whole by laser, the welding boss V (12-1) of the air inlet connector (12) and the welding boss V (13-3) of the air inlet cover plate (13) are welded into a whole by laser, the welding assembly surface (8-2) of the porous vent pipe (8) and the welding boss V (13-2) of the air inlet cover plate (13) are welded into a whole by laser, the dust filter screen (7) is sleeved outside the cylinder of the porous vent pipe (8) and is connected into a whole by glue joint, the air inlet filter screen (10) is placed between the drying agent placing frame (6) and the filter screen compression ring (11), the assembly welding position (6-2) of the drying agent placing frame (6) and the assembly through hole (11-1) of the filter screen compression ring (11) are welded into a whole by laser, the drying agent (14) is placed between the shell (9) and the drying agent placing frame (6), the air outlet filter screen (4) is placed between the filter screen upper pressing plate (3) and the filter screen lower pressing plate (5), the welding boss four (8-1) of the porous vent pipe (8) and the welding mounting hole (3-1) of the filter screen upper pressing plate (3) are welded into a whole through laser welding, and the shell (9) and the welding boss two (2-1) of the air outlet cover plate (2) and the welding boss six (13-1) of the air inlet cover plate (13) are welded into a whole through laser welding.
2. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the air outlet connector (1) is made of stainless steel and is cylindrical, a welding boss I (1-1) is arranged on one side, an M6 standard threaded connector is arranged on the other side, and a circular vent hole is formed in the center of the cylinder.
3. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the air outlet cover plate (2) is made of stainless steel and is in a circular sheet shape, one side of the air outlet cover plate is provided with a second welding boss (2-1), the other side of the air outlet cover plate is provided with a third welding boss (2-2), and the center of the air outlet cover plate is provided with a circular vent hole.
4. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the filter screen upper pressure plate (3) is made of stainless steel and is in a circular sheet shape, a welding mounting hole (3-1) is formed in the center of the filter screen upper pressure plate, and 12-18 circular vent holes are uniformly distributed in the periphery of the filter screen upper pressure plate.
5. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the filter screen lower pressing plate (5) is made of stainless steel and is in a circular disc shape, the center of the filter screen lower pressing plate is provided with a first assembling through hole (5-1), and 12-18 circular vent holes are uniformly distributed on the periphery of the filter screen lower pressing plate.
6. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the desiccant placing frame (6) is made of stainless steel and is cylindrical, an assembling through hole II (6-1) is formed in the top of the desiccant placing frame, an assembling welding position (6-2) is formed in the bottom of the desiccant placing frame, and 12-18 circular vent holes are uniformly distributed in the lower portion of the cylinder.
7. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the porous vent pipe (8) is made of stainless steel and is cylindrical, the top of the porous vent pipe is provided with a welding boss IV (8-1), 55-70 circular air inlets are formed around the cylinder body, and the bottom of the porous vent pipe is provided with a welding assembly surface (8-2).
8. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the filter screen compression ring (11) is made of stainless steel and is in a circular sheet shape, an assembly through hole (11-1) is formed in the middle of the filter screen compression ring, and 12-18 circular air inlets are uniformly distributed in the periphery of the filter screen compression ring.
9. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the air inlet joint (12) is made of stainless steel and is cylindrical, one side of the air inlet joint is provided with a welding boss five (12-1), the other side of the air inlet joint is provided with an M6 standard threaded joint, and the center of the cylinder is provided with a circular vent hole.
10. The infrared detector dewar assembly atmospheric isolation pollution device according to claim 1, wherein: the air inlet cover plate (13) is made of stainless steel and is in a circular sheet shape, one side of the air inlet cover plate is provided with a welding boss six (13-1), the middle of the welding boss six (13-1) is provided with a welding boss seven (13-2), the middle of the other side of the air inlet cover plate is provided with a welding boss eight (13-3), and the middle of the air inlet cover plate is provided with a circular vent hole.
CN201811317273.3A 2018-11-07 2018-11-07 Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device Active CN109351079B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811317273.3A CN109351079B (en) 2018-11-07 2018-11-07 Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811317273.3A CN109351079B (en) 2018-11-07 2018-11-07 Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device

Publications (2)

Publication Number Publication Date
CN109351079A CN109351079A (en) 2019-02-19
CN109351079B true CN109351079B (en) 2020-11-24

Family

ID=65344471

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811317273.3A Active CN109351079B (en) 2018-11-07 2018-11-07 Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device

Country Status (1)

Country Link
CN (1) CN109351079B (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5288469A (en) * 1992-03-16 1994-02-22 Envirosurgical, Inc. Surgery plume filter device
CN201470297U (en) * 2009-08-18 2010-05-19 中国北车集团大同电力机车有限责任公司 Portable dryer
FI20115732A0 (en) * 2011-07-07 2011-07-07 Ecocat Oy New cleaner construction
CN205164320U (en) * 2015-11-30 2016-04-20 四川旭阳药业有限责任公司 High -efficiency filter for compressed air
CN105920983A (en) * 2016-06-08 2016-09-07 珠海市思卡净化技术有限公司 Compressed air drying and filtering drum

Also Published As

Publication number Publication date
CN109351079A (en) 2019-02-19

Similar Documents

Publication Publication Date Title
CN100373497C (en) Disk device
CN108404614A (en) A kind of interaction switch type compressed air purifier
US20010047723A1 (en) Canister mounting structure
CN105920983A (en) Compressed air drying and filtering drum
CN109351079B (en) Infrared detector dewar subassembly UNICOM atmosphere back isolation pollution device
JP5107216B2 (en) Evaporative fuel processing equipment
CN108468833A (en) A kind of interaction switching pressurized air purification valve body
JP2000114061A (en) Hygroscopic breathing device
CN211106940U (en) Environment-friendly oil tank air cleaner
CN211051215U (en) Internal and external pressure balance air purification and drying device
CN115585293A (en) Explosion-proof balanced valve and battery box
CN208518776U (en) A kind of canister with ash filter and solenoid valve integrated morphology
CN208518772U (en) Canister
CN213986360U (en) CEMS (continuous emission monitoring System) moisture meter gas circuit system for 1000MW (megawatt) secondary reheating unit
CN216048525U (en) Drying filter for refrigeration cycle system
CN219399432U (en) Semiconductor gas sensor filter device with single-layer filter structure
CN216537450U (en) Refrigerant sensor
CN217207775U (en) High-performance ceramic seal butterfly valve
CN217082209U (en) Gas circuit protection device of hydrogen generator
CN217780878U (en) Aeration system
CN220677340U (en) Gas drying and filtering device and ultrahigh vacuum relieving device
CN214251926U (en) High-efficient aerosol diffusion drying tube
CN213394920U (en) Waterproof ventilation mechanism of lamp with simple assembly
CN220802565U (en) Small-size filter unit
CN215216558U (en) Air purification device for fresh air system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant