CN209297760U - A kind of negative pressure airtight construction of electro-optical system pressure adjustable - Google Patents
A kind of negative pressure airtight construction of electro-optical system pressure adjustable Download PDFInfo
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- CN209297760U CN209297760U CN201822189275.0U CN201822189275U CN209297760U CN 209297760 U CN209297760 U CN 209297760U CN 201822189275 U CN201822189275 U CN 201822189275U CN 209297760 U CN209297760 U CN 209297760U
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- seal cavity
- adjustable
- optical system
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Abstract
The utility model discloses a kind of negative pressure airtight constructions of electro-optical system pressure adjustable comprising seal cavity ontology and the single-direction, constant pressure valve being arranged on seal cavity ontology, single-direction, constant pressure valve are unidirectional airtight from inside to outside.The utility model is simple and compact for structure, can adapt to aircraft environment, realizes that internal pressure is independently adjustable.
Description
Technical field
The utility model belongs to electro-optical system technical field, is related to a kind of control using single-direction, constant pressure valve, internal pressure
The negative pressure airtight construction of autonomous adjustable electro-optical system pressure adjustable.
Background technique
The electro-optical systems such as the optical instrument used on aircraft or imaging system internal structure, composition are more accurate, optics
The adaptive capacity to environment of element surface film layer is poor, and when general storage is required in more dry environment, with prevent its
Mildew etc. occurs in long term storage.Meanwhile because the aircraft variation of internal and external temperature and pressure during the work time it is prominent
Become, excessively high may cause of internal moisture diffusion condenses in optical element surface, the transmitance of optical system is influenced, so as to cause appointing
The failure of business.Therefore general optical instrument or imaging system are all made of airtight construction design, and by setting to inner air
It changes, injection dry air or nitrogen in inside, and keeps certain positive pressure with external, to prevent the mutation of temperature and pressure from causing
It condenses in optical element surface, and transmissivity of optical system is caused to decline, to be impacted to imaging or use, and then influence
The success of task.Using traditional airtight construction, it is however generally that, after completing structure gas-tight fit, need to inner air into
Row repeatedly after displacement, reinjects the dry air or nitrogen of certain pressure, forms dry environment in seal cavity, but grasping
Special processing step is needed on work；And the influence of the air-tightness because of sealing structure itself, the general airtight shelf-life was in 5 years
Left and right, needs repeatedly to carry out periodic maintenance maintenance in storage period, to ensure the later period in use, interior environmental conditions reach makes
With requiring, greatly inconvenience is caused to maintenance use or increases biggish workload.
Utility model content
(1) purpose of utility model
The purpose of this utility model is: place in view of the deficiency of the prior art, provides a kind of electro-optical system use
The negative pressure airtight construction of pressure adjustable, makes full use of the flight characteristic of aircraft, real in the change procedure for adapting to pressure automatically
Gas displacement in existing internal airtight space.
(2) technical solution
In order to solve the above-mentioned technical problem, the utility model provides a kind of airtight knot of negative pressure of electro-optical system pressure adjustable
Structure comprising seal cavity ontology 1 and the single-direction, constant pressure valve 2 being arranged on seal cavity ontology 1, single-direction, constant pressure valve 2 is by introversion
It is outer unidirectional airtight.
Wherein, mounting hole is opened on the seal cavity ontology 1, single-direction, constant pressure valve 2 is mounted in mounting hole, mounting hole wall
Zero type sealing ring 3 is set between 2 outside wall surface of single-direction, constant pressure valve.
Wherein, the O-ring seal 3 uses rubber seal.
Wherein, the O-ring seal 3 uses silicone rubber O-ring
Wherein, 2 air pressure of single-direction, constant pressure valve is adjustable, when 1 internal pressure of seal cavity ontology is more than that single-direction, constant pressure valve 2 is set
When constant-pressure, 1 internal gas of seal cavity ontology is unidirectionally discharged by single-direction, constant pressure valve 2.
Wherein, it is P0 that the single-direction, constant pressure valve 2, which presets pressure, and Pin is 1 internal gas pressure of seal cavity ontology,
Pout is 1 the external gas pressure of seal cavity ontology；As Pin-Pout≤P0, seal cavity ontology 1 keeps current air pressure
State；When Pin-Pout > P0,1 internal pressure of seal cavity ontology is released stress outward by single-direction, constant pressure valve 2, until Pin-
Pout=P0.
(3) beneficial effect
The negative pressure airtight construction of electro-optical system pressure adjustable provided by above-mentioned technical proposal, changes traditional airtight construction
Into newly-increased single-direction, constant pressure valve technology is mature, and small in size, compact-sized, the influence designed existing structure or structure is small, can be with
Existing structure is improved and is applied；The utility model can be used as all kinds of aircraft optical seekers, optical instrument or optoelectronic device
Deng airtight construction scheme use；The utility model can make full use of the flight course feature of aircraft, eliminate a large amount of consumptions
When processing step, greatly simplify maintenance process for using, improve fighting capacity.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of the utility model；
Fig. 2 is the utility model negative-pressure sealing schematic illustration.
Wherein, 1 is seal cavity, and 2 be single-direction, constant pressure valve, and 3 be zero type sealing ring.
Specific embodiment
To keep the purpose of this utility model, content and advantage clearer, with reference to the accompanying drawings and examples, to this reality
It is described in further detail with novel specific embodiment.
Shown in referring to Fig.1, the negative pressure airtight construction of the utility model electro-optical system pressure adjustable includes seal cavity sheet
Body 1 and the single-direction, constant pressure valve 2 being arranged on seal cavity ontology 1, single-direction, constant pressure valve 2 are unidirectional airtight from inside to outside.
2 air pressure of single-direction, constant pressure valve is adjustable, when 1 internal pressure of seal cavity ontology is more than setting pressure, according to using ring
The variation of border condition, 1 internal pressure of seal cavity ontology is independently adjustable, and 1 internal gas of seal cavity ontology passes through single-direction, constant pressure
Valve 2 is unidirectionally discharged.
Single-direction, constant pressure valve 2 is under air pressure setting condition, when 1 external pressure of seal cavity ontology is greater than internal pressure, tool
There are airtight capabilities.
Zero type sealing ring 3 is set between seal cavity ontology 1 and single-direction, constant pressure valve 2；O-ring seal 3 uses rubber seal
Circle, preferably silicone rubber O-ring, to realize splendid heat-resisting, cold-resistant, resistance to ozone, resistance to weathering energy.
In the assembly of optical seeker, optical instrument or optoelectronic device, after the completion of in dried and clean environment, do not need pair
Seal cavity, which carries out gas displacement and injection dry air or nitrogen, makes seal cavity opposite outer environment form positive pressure；It is flying
When device high-altitude flight, since it is to during exoatmosphere or high-altitude flight, external pressure becomes smaller, and internal pressure increases, when interior
After portion's pressure is greater than the pressure value of single-direction, constant pressure valve setting, the intracorporal air of seal chamber is gradually released to outside by single-direction, constant pressure valve
It sets a raft going out, until the pressure with extraneous formation single-direction, constant pressure valve setting, inner air is discharged substantially (with ground during this
Vacuum pump discharges are identical), to form the environment of relatively dry in inside；In aircraft atmospheric reentry or process of subduction
In, external pressure increases, but because of negative pressure airtight construction, extraneous gas cannot be introduced into seal cavity, to maintain internal pressure
It is constant.
Refering to negative-pressure sealing schematic illustration shown in Fig. 2, single-direction, constant pressure valve has directionality, in this programme in use,
It should be noted that installation direction.Wherein P0 is that single-direction, constant pressure valve keeps pressure, to preset pressure.As Pin-Pout≤P0,
No matter how external pressure changes, and seal cavity keeps current atmospheric pressure state；When Pin-Pout > P0, internal pressure passes through list
It is released stress outward to constant pressure valve, when Pin-Pout=P0；In the above process, the intracorporal pressure of seal chamber remains single
Tropism.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
Claims (6)
1. a kind of negative pressure airtight construction of electro-optical system pressure adjustable, which is characterized in that including seal cavity ontology (1) and set
The single-direction, constant pressure valve (2) on seal cavity ontology (1) is set, single-direction, constant pressure valve (2) is unidirectional airtight from inside to outside.
2. the negative pressure airtight construction of electro-optical system pressure adjustable as described in claim 1, which is characterized in that the seal chamber
Mounting hole is opened on body ontology (1), single-direction, constant pressure valve (2) is mounted in mounting hole, mounting hole wall and single-direction, constant pressure valve (2) outer wall
O-ring seal (3) are set between face.
3. the negative pressure airtight construction of electro-optical system pressure adjustable as claimed in claim 2, which is characterized in that described O-shaped close
Seal (3) uses rubber seal.
4. the negative pressure airtight construction of electro-optical system pressure adjustable as claimed in claim 3, which is characterized in that described O-shaped close
Seal (3) uses silicone rubber O-ring.
5. the negative pressure airtight construction of electro-optical system pressure adjustable as claimed in claim 4, which is characterized in that the unidirectional perseverance
Pressure valve (2) air pressure is adjustable, when seal cavity ontology (1) internal pressure is more than single-direction, constant pressure valve (2) setting pressure, seal cavity
Ontology (1) internal gas is unidirectionally discharged by single-direction, constant pressure valve (2).
6. the negative pressure airtight construction of electro-optical system pressure adjustable as claimed in claim 5, which is characterized in that the unidirectional perseverance
It is P0 that pressure valve (2), which presets pressure, and Pin is seal cavity ontology (1) internal gas pressure, and Pout is seal cavity ontology
(1) the external gas pressure；As Pin-Pout≤P0, seal cavity ontology (1) keeps current atmospheric pressure state；Pin-Pout >
When P0, seal cavity ontology (1) internal pressure is released stress outward by single-direction, constant pressure valve (2), until Pin-Pout=P0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822189275.0U CN209297760U (en) | 2018-12-25 | 2018-12-25 | A kind of negative pressure airtight construction of electro-optical system pressure adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822189275.0U CN209297760U (en) | 2018-12-25 | 2018-12-25 | A kind of negative pressure airtight construction of electro-optical system pressure adjustable |
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| Publication Number | Publication Date |
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| CN209297760U true CN209297760U (en) | 2019-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822189275.0U Active CN209297760U (en) | 2018-12-25 | 2018-12-25 | A kind of negative pressure airtight construction of electro-optical system pressure adjustable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545272A (en) * | 2018-12-25 | 2019-03-29 | 西南技术物理研究所 | A kind of negative pressure airtight construction of electro-optical system pressure adjustable |
-
2018
- 2018-12-25 CN CN201822189275.0U patent/CN209297760U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545272A (en) * | 2018-12-25 | 2019-03-29 | 西南技术物理研究所 | A kind of negative pressure airtight construction of electro-optical system pressure adjustable |
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