CN104159435A - Structure for preventing monitoring equipment from condensation and method - Google Patents
Structure for preventing monitoring equipment from condensation and method Download PDFInfo
- Publication number
- CN104159435A CN104159435A CN201410393681.2A CN201410393681A CN104159435A CN 104159435 A CN104159435 A CN 104159435A CN 201410393681 A CN201410393681 A CN 201410393681A CN 104159435 A CN104159435 A CN 104159435A
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- CN
- China
- Prior art keywords
- air bag
- pressure regulation
- pressure
- device housings
- protective cover
- 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.)
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- 238000000034 method Methods 0.000 title claims description 11
- 238000012544 monitoring process Methods 0.000 title abstract description 7
- 238000009833 condensation Methods 0.000 title abstract description 3
- 230000005494 condensation Effects 0.000 title abstract 2
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000033228 biological regulation Effects 0.000 claims description 54
- 230000001681 protective effect Effects 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 238000004512 die casting Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 201000001371 inclusion conjunctivitis Diseases 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 206010044325 trachoma Diseases 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Pressure Vessels And Lids Thereof (AREA)
- Drying Of Gases (AREA)
Abstract
The invention relates to a structure for preventing monitoring equipment from condensation, which comprises an equipment shell, a protection cover and a pressure-adjusting air bag. The equipment shell is internally provided with an integratedly-made cylindrical platform with outer thread; a through hole is made in the end surface, in the middle of the cylindrical platform, of the equipment shell; the cylindrical platform is in coaxial thread connection with the protection cover; the protection cover is internally provided with the pressure-adjusting air bag in a sealing mode; the inner part of the pressure-adjusting air bag is communicated with the air outside the equipment shell via the through hole; the middle of the bottom part of the protection cover is provided with a protection cover hole; and the space between the protection cover and the pressure-adjusting air bag is communicated with the air inside the equipment shell via the protection cover hole. According to the structure of the invention, the structure is simple; when temperature rises, the pressure inside the shell is increased, the size of the pressure-adjusting air bag is reduced, the volume of the shell is increased, the inner pressure is reduced consequently until the inner pressure is balanced with the outer pressure; and when the temperature falls, the inner pressure of the shell is reduced, the size of the pressure-adjusting air bag is increased, the volume of the shell is reduced, the inner pressure is increased consequently until the inner pressure is balanced with the outer pressure.
Description
Technical field
The invention belongs to technical field of video monitoring, relate to headend equipment, especially a kind of structure and method that prevents watch-dog dewfall.
Background technology
Along with the development of Video Supervision Technique, the performance requirement of front end video monitoring equipment is improved constantly, especially the requirement to image definition quality.
At present, be arranged on the phenomenon that " dewfall " can appear at form inwall in outdoor watch-dog conventionally, " dewfall " seriously affected the definition of video image, reduced quality monitoring, and permanent protective property can be the main cause that causes " dewfall ".
In order to prevent that being arranged on outdoor equipment infiltrates rainwater, manufacturer does very tightly by the seal approach of watch-dog shell conventionally, generally reaches IP66, IP67 degree of protection.Because device interior has moisture, in the time that the outside air temperature of equipment declines, the temperature of device interior also declines thereupon, and its inner relative humidity increases, and condenses into dew while reaching capacity, is called for short " dewfall ".Therefore, reducing the absolute magnitude of device interior moisture, avoid device interior relative humidity saturated, is the basic method of Antidewing.
In view of the above problems, place drier and be used for absorption equipment internal moisture in equipment, this method is widely adopted.But these have laid equipment after date in the time using a section of drier, " dewfall " phenomenon can slowly display again, and its reason is that equipment sealing is not thorough, and there has been again moisture inside.Original equipment that has met IP66, IP67 test requirements document, in use procedure, there is again dewfall phenomenon, except the defect (as foundry goods trachoma, riveted joint failure welding, adhesive separation etc.) of device housings, topmost reason be seal not thorough, or the fully and completely equipment of (as lip-type packing, shell poor rigidity are housed) of sealing, in use all can occur " breathing phenomenon ".
So-called " breathing phenomenon ", refers to that watch-dog is in the time of temperature control, and device interior air pressure changes: when temperature raises, device interior air pressure raises, and in the time that pressure exceedes its sealability, just has gas and " exhales "; Otherwise in the time that temperature reduces, device interior air pressure declines, when pressure is during lower than its sealability, just have ambient atmos and entered by " suction ", become " breathing phenomenon ".Although the gas of each " breathing " can be not a lot, " exhalation " be inner " being dried " gas, and " suction " be extraneous " wetting " gas, in the course of time, the moisture of device interior can increase, and drier can saturated inefficacy, and " dewfall " phenomenon can occur gradually thereupon.
Therefore, how to solve the device interior and the extraneous problem that produces pressure differential that cause sealing because of variations in temperature, become a crux that improves video monitoring equipment anti-condensation performance.
Through retrieval, do not find to address the above problem effective technological means.
Summary of the invention
The object of the invention is to solve the device interior and the extraneous problem that produces pressure differential that cause sealing because of variations in temperature, a kind of structure that prevents watch-dog dewfall and method simple in structure, easy to use are provided.
The solution of the present invention is achieved in that
A kind of structure that prevents watch-dog dewfall, comprise device housings, protective cover and pressure regulation air bag, described device housings the inside one is shaped with is with externally threaded cylinder table, the device housings end face at this cylinder table center is coaxially shaped with through hole, described cylinder table coaxial threaded connects protective cover, in this protective cover, pressure regulation air bag is installed in sealing, this pressure regulation inside air bag is by the air communication of through hole and device housings outside, described protective cover bottom centre is shaped with protective cover hole, space between described protective cover and pressure regulation air bag is by the air communication of protective cover hole and device housings inside.
And described pressure regulation air bag is quality of rubber materials, the opening part one of this pressure regulation air bag is shaped with flange ring.
And described protective cover is alloy aluminum material, the upper end one of this protective cover is shaped with the annulus coordinating with described cylinder table, coaxial installation packing ring between the flange ring of the inside of this annulus and described pressure regulation air bag, and described annulus outer rim is evenly shaped with fin.
And described device housings is die casting aluminium material.
A method that prevents watch-dog dewfall, step is as follows:
Step 1, outside air temperature increases the air pressure of device housings inside while rising, and the gas extrusion pressure regulation air bag of device housings inside, makes the gas of pressure regulation inside air bag discharge by through hole, and pressure regulation air bag volume reduces;
Step 2, outside air temperature declines the air pressure of device housings inside while reduction thereupon, and the gas of device housings outside enters in pressure regulation air bag, makes gassy in pressure regulation air bag, and pressure regulation air bag volume increases.
Advantage of the present invention and good effect are:
1, this structure is by installing pressure regulation air bag in device housings sealing, the volume of device housings entirety become vary with temperature and variable.
2, by the outside at pressure regulation air bag, protective cover is installed, prevent that pressure regulation air bag is subject to mechanical damage, increases the service life.
3, the present invention is simple in structure, design science is reasonable, and in the time that temperature raises, enclosure pressure increases, and pressure regulation air bag volume reduces, and makes shell volume become large, and internal pressure declines thereupon, until keep balance with ambient pressure; Temperature decline time, enclosure pressure decreased, pressure regulation air bag volume increase, shell volume is diminished, internal pressure increases thereupon, until with ambient pressure balance.This structure effectively prevents from, in extraneous aqueous vapor access arrangement shell, having realized the object that is arranged on outdoor watch-dog Antidewing.
Brief description of the drawings
Fig. 1 is structure cutaway view of the present invention (when high temperature);
Fig. 2 is the structure cutaway view of pressure regulation air bag in Fig. 1;
Fig. 3 is the structural representation of protective cover in Fig. 1;
Fig. 4 is structure cutaway view of the present invention (when low temperature).
Embodiment
Below in conjunction with accompanying drawing and by specific embodiment, the invention will be further described.
A kind of structure that prevents watch-dog dewfall, as shown in Figure 1, comprise device housings 1, protective cover 2 and pressure regulation air bag 4, described device housings the inside one is shaped with is with externally threaded cylinder table 6, the device housings end face at this cylinder table center is coaxially shaped with through hole 7, described cylinder table coaxial threaded connects protective cover, in this protective cover, pressure regulation air bag is installed in sealing, this pressure regulation inside air bag is by the air communication of through hole and device housings outside, described protective cover bottom centre is shaped with protective cover hole 5, space between described protective cover and pressure regulation air bag is by the air communication of protective cover hole and device housings inside.
In the present embodiment, described device housings is that die casting aluminium is made, and is the matrix of total.
Described pressure regulation air bag is elasticity, and suitable elastomeric material is made, it is the main body of adjusting device housings volume, the opening part one of this pressure regulation air bag is shaped with the flange ring 8 of being convenient to installation, as shown in Figure 2, this flange ring has enough thickness, to ensure firmness that pressure regulation air bag is installed and the reliability of sealing; The thickness of this pressure regulation air bag telescopic section, under the prerequisite of proof strength, as far as possible thin, can reduce like this impact of rubber pneumatic bag deformation force on air pressure as far as possible, ensure that the inside and outside air pressure of equipment equates; The volume of this pressure regulation air bag is that the gas volume excursion causing according to conditions for equipment use temperature Change scope is determined, and the volume of air bag is crossed the strength decreased (same to material thickness) that conference makes air bag, and takies device interior space.
Described protective cover is alloy aluminum material; play the effect that sealing and protection pressure regulation air bag are not subject to mechanical failure; its structure as shown in Figure 3; the upper end one of this protective cover is shaped with the annulus 9 coordinating with described cylinder table; coaxial installation packing ring 3 between the flange ring of the inside of this annulus and described pressure regulation air bag; described annulus outer rim is evenly shaped with fin 10, and object is to be convenient to control rotation.
Described device housings is installed the position of pressure regulation air bag, should select outside to have the place of protection thing, to avoid pressure regulation air bag to be subject to the injury of extraneous foreign matter, and as the inner core top of the ball machine with sky shade, correct position etc. in the upper cover of various protective covers.
Prevent a method for watch-dog dewfall, its step is as follows:
Step 1, outside air temperature increases the air pressure of device housings inside while rising, the gas extrusion pressure regulation air bag of device housings inside, as shown in Figure 1, the flow direction that in this figure, the direction of arrow is air, makes the gas of pressure regulation inside air bag discharge by through hole, and pressure regulation air bag volume reduces;
Step 2, outside air temperature declines the air pressure of device housings inside while reduction thereupon, and the gas of device housings outside enters in pressure regulation air bag, make gassy in pressure regulation air bag, pressure regulation air bag volume increases, as shown in Figure 4, and the flow direction that in this figure, the direction of arrow is air.
Operation principle of the present invention is:
According to French scientist carat amber dragon, 3 parameter: P (air pressure), V (volume), T (thermodynamic temperature), the R (gas constant) of the gaseous state that idealizes are attributed to an equation, PV=RT, be expressed as: a certain amount of gas, the product of volume and pressure is directly proportional to thermodynamic temperature.Completely desirable gas also can not exist, but many test gases, particularly those gases that are not easy to liquefy, sublimate are (as helium, oxygen, nitrogen etc., due to nitrogen, not only volume is little, also be the most difficult liquefaction in all gas, therefore it is the gas that approaches ideal gas in all gas most), pressure little in the variations in temperature character when little is very close to ideal gas.And in air, nitrogen accounts for 78%, the rare gas such as oxygen accounts for 21%, helium accounts for 0.94%, carbon dioxide accounts for 0.03%, other gases and impurity account for 0.03%, so the state behavior of air is also followed gas state equation.
The dry air that is mixed with steam is humid air, and under the certain condition of temperature and pressure, the amount that the dry air of a constant volume can hold steam is limited, is saturated moist air while reaching this limit.While exceeding this limit, unnecessary steam will be condensed into dew.Do not changing under the prerequisite of water vapour content, when unsaturation humid air is cooled to saturation condition, corresponding temperature is dew point temperature.When the temperature of inner surface of outer cover is during lower than dew point temperature, will there is dewfall in inner surface.
For the shell of certain video monitoring equipment, inside has a certain amount of gas, in the time of extraneous variations in temperature, keep air pressure inside identical with ambient pressure (in the environment using at equipment if want, extraneous air pressure can be thought not temperature variant), only have the volume of variation device shell, make P, V reach new balance.
The present invention is according to above-mentioned principle, installed and the pressure regulation air bag of body seal on device housings, the volume of device housings entirety become vary with temperature and variable.When temperature raises, enclosure pressure increases, and pressure regulation air bag volume reduces, and makes shell volume become large, and internal pressure declines thereupon, until keep balance with ambient pressure; Temperature decline time, enclosure pressure decreased, pressure regulation air bag volume increase, shell volume is diminished, internal pressure increases thereupon, until with ambient pressure balance.The inside and outside pressure balance of device housings like this, " " can not occur, extraneous aqueous vapor can not enter shell to breathing phenomenon again.There is no entering of aqueous vapor, enclosure remains dry air, and dewfall phenomenon is just difficult to occur.
It is emphasized that; embodiment of the present invention is illustrative; instead of determinate; therefore the present invention includes and be not limited to the embodiment described in embodiment; every other execution modes that drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (5)
1. one kind prevents the structure of watch-dog dewfall, it is characterized in that: comprise device housings, protective cover and pressure regulation air bag, described device housings the inside one is shaped with is with externally threaded cylinder table, the device housings end face at this cylinder table center is coaxially shaped with through hole, described cylinder table coaxial threaded connects protective cover, in this protective cover, pressure regulation air bag is installed in sealing, this pressure regulation inside air bag is by the air communication of through hole and device housings outside, described protective cover bottom centre is shaped with protective cover hole, space between described protective cover and pressure regulation air bag is by the air communication of protective cover hole and device housings inside.
2. the structure that prevents watch-dog dewfall according to claim 1, is characterized in that: described pressure regulation air bag is quality of rubber materials, and the opening part one of this pressure regulation air bag is shaped with flange ring.
3. the structure that prevents watch-dog dewfall according to claim 1; it is characterized in that: described protective cover is alloy aluminum material; the upper end one of this protective cover is shaped with the annulus coordinating with described cylinder table; coaxial installation packing ring between the flange ring of the inside of this annulus and described pressure regulation air bag, described annulus outer rim is evenly shaped with fin.
4. the structure that prevents watch-dog dewfall according to claim 1, is characterized in that: described device housings is die casting aluminium material.
5. a method that prevents watch-dog dewfall, is characterized in that, step is as follows:
Step 1, outside air temperature increases the air pressure of device housings inside while rising, and the gas extrusion pressure regulation air bag of device housings inside, makes the gas of pressure regulation inside air bag discharge by through hole, and pressure regulation air bag volume reduces;
Step 2, outside air temperature declines the air pressure of device housings inside while reduction thereupon, and the gas of device housings outside enters in pressure regulation air bag, makes gassy in pressure regulation air bag, and pressure regulation air bag volume increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410393681.2A CN104159435B (en) | 2014-08-12 | 2014-08-12 | A kind of structure preventing monitoring device from condensing and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410393681.2A CN104159435B (en) | 2014-08-12 | 2014-08-12 | A kind of structure preventing monitoring device from condensing and method |
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| Publication Number | Publication Date |
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| CN104159435A true CN104159435A (en) | 2014-11-19 |
| CN104159435B CN104159435B (en) | 2016-08-24 |
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| CN201410393681.2A Active CN104159435B (en) | 2014-08-12 | 2014-08-12 | A kind of structure preventing monitoring device from condensing and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042144A (en) * | 2015-08-25 | 2015-11-11 | 太仓市荣驰电机有限公司 | Sealing protection system and method for closed device |
| CN108684182A (en) * | 2018-08-21 | 2018-10-19 | 高学峰 | A kind of bin |
| CN108953843A (en) * | 2018-09-13 | 2018-12-07 | 德清恒升管件有限公司 | A kind of protective cover of pipe joint screw thread |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19857955A1 (en) * | 1998-12-16 | 2000-06-21 | Pierburg Ag | Internal combustion engine exhaust gas constant volume sampling system uses a balanced pressure collection system and flexible walled sample containers, and is especially suitable for very low concentration emissions |
| CN101750851B (en) * | 2008-12-10 | 2011-04-20 | 天津市亚安科技电子有限公司 | Protective cover with anti-dewing function |
| AT10542U3 (en) * | 2009-01-19 | 2009-10-15 | Avl List Gmbh | CONDENSATION KEY COUNTER |
| CN201607264U (en) * | 2010-02-07 | 2010-10-13 | 王学良 | Pressure balance film device |
| CN203018411U (en) * | 2012-11-18 | 2013-06-26 | 陈通 | Air pressure energy storage system with air pressure and water level monitoring function |
| CN202973029U (en) * | 2012-12-15 | 2013-06-05 | 泰州市锦浩光电科技有限公司 | Device capable of keeping internal pressure of lamp and external pressure of lamp balanced |
-
2014
- 2014-08-12 CN CN201410393681.2A patent/CN104159435B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042144A (en) * | 2015-08-25 | 2015-11-11 | 太仓市荣驰电机有限公司 | Sealing protection system and method for closed device |
| WO2017032323A1 (en) * | 2015-08-25 | 2017-03-02 | 太仓市荣驰电机有限公司 | Sealing protection system and method for sealed apparatus |
| CN108684182A (en) * | 2018-08-21 | 2018-10-19 | 高学峰 | A kind of bin |
| CN108953843A (en) * | 2018-09-13 | 2018-12-07 | 德清恒升管件有限公司 | A kind of protective cover of pipe joint screw thread |
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| Publication number | Publication date |
|---|---|
| CN104159435B (en) | 2016-08-24 |
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Address after: 300384 in Tianjin Binhai Huayuan Industrial Zone (outer ring) eight Haitai Huake Road No. 6 Applicant after: TIANJIN YAAN TECHNOLOGY Co.,Ltd. Address before: 300384 Tianjin City Huayuan Industrial Zone Binhai Ziyuan Road No. 8 Applicant before: TIANJIN YAAN TECHNOLOGY Co.,Ltd. |
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