CN111751948B - Pressure self-balancing type optical lens packaging structure of deep sea instrument - Google Patents
Pressure self-balancing type optical lens packaging structure of deep sea instrument Download PDFInfo
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- CN111751948B CN111751948B CN202010611353.0A CN202010611353A CN111751948B CN 111751948 B CN111751948 B CN 111751948B CN 202010611353 A CN202010611353 A CN 202010611353A CN 111751948 B CN111751948 B CN 111751948B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/007—Pressure-resistant sight glasses
Abstract
The invention discloses a pressure self-balancing type deep sea instrument optical lens packaging structure, and relates to the technical field of deep sea optical detection equipment. Pressure self-balancing type deep sea instrument optical lens packaging structure includes: the sealing device comprises a sealing end cover, a sealing ring and a sealing ring, wherein an axial sealing ring and a radial sealing ring are arranged on one side of the sealing end cover, and a first annular notch is formed in the end part of the other side of the sealing end cover; and the end part of one side of the optical window pressing plate is provided with a second annular notch matched with the first annular notch. According to the invention, by changing the sealing structure between the optical window pressing plate and the optical window, a gap is reserved at the contact part of the optical window pressing plate and the end face of the optical window, so that most of seawater pressure can be automatically balanced by the optical window pressing plate and the optical window, and the problems that the optical window is crushed due to high-pressure deformation of the optical window pressing plate and optical signals cannot be smoothly transmitted and converged due to external pressure deformation of the optical window are solved.
Description
Technical Field
The invention relates to the technical field of deep sea optical detection equipment, in particular to an optical lens packaging structure of a pressure self-balancing type deep sea instrument.
Background
The flow velocity of the submarine hydrothermal solution has important significance for researches on the output flux of submarine hydrothermal solution nozzle substances, submarine geological structure change, biological community distribution rule and the like. The deep sea optical detecting instrument based on the laser Doppler velocity measurement principle is a necessary basic testing means for researching the flow velocity, the packaging structure of the measuring system is used as a carrier of each internal component, the safety, reliability and convenience in working of the system are guaranteed, and the stability and reliability of the packaging structure play a vital role in the stability of the whole project.
The working conditions of the deep sea optical detection instrument based on the laser Doppler velocity measurement principle are normal temperature and normal pressure, and the research on the flow rate of submarine hydrothermal solution is relatively difficult in a high-temperature and high-pressure environment. Therefore, when the deep sea flow velocity is detected, the laser doppler velocity measurement equipment needs to be placed in a pressure-resistant cabin to enable the pressure-resistant cabin to be in a normal-temperature normal-pressure environment, the pressure-resistant cabin is sealed through a packaging structure, and an optical observation window is installed on the packaging structure.
The deep sea optical detecting instrument consists of light source, emitting light path, receiving lens set, optical platform and signal processing circuit. The two single-frequency narrow linewidth green fiber lasers of the emission light path emit light signals, and the light signals are converged at the hydrothermal solution and then reflected back to be received by the receiving mirror group. The optical observation window has the function that the two beams of optical signals can be smoothly emitted from the interior of the packaging structure and reach the hydrothermal liquid and accurately gather on the hydrothermal liquid.
Under the deep sea external pressure condition, especially under the deep sea seven kilometers huge external pressure condition, the optical observation window is easy to deform or even be crushed by external pressure; meanwhile, in the deep sea optical detection instrument based on the laser Doppler velocity measurement principle, two beams of emitted optical signals are greatly influenced by the interference of the external environment, the refractive index of a medium can be changed due to the deformation of an optical window caused by external pressure, and finally the emission light path of the two beams of optical signals is changed, so that the optical signals cannot be converged at a hydrothermal solution and return to a receiving lens group. How to solve the technical problems is a technical problem to be solved in the technical field of deep sea optical detection equipment at present.
Disclosure of Invention
In view of the above technical problems, an embodiment of the present invention provides a pressure self-balancing type deep sea instrument optical lens package structure to solve the problems in the background art.
The invention provides the following technical scheme: a pressure self-balancing type deep sea instrument optical lens packaging structure comprises:
the end part of one side of the sealing end cover is provided with a first annular gap;
the optical window pressing plate is provided with a second annular notch matched with the first annular notch at one side end part, and the first annular notch and the second annular notch are spliced to form an annular groove;
the optical window is arranged in the annular groove, a gap is reserved between the upper end surface of the optical window and the inner top wall of the annular groove, and a gap is reserved between the lower end surface of the optical window and the inner bottom wall of the annular groove;
the inner surfaces of the first annular gap and the second annular gap are frosted surfaces or embossed surfaces.
Preferably, the sealing end cover is provided with a first emitting light path channel, a second emitting light path channel and a light path return channel, and the first emitting light path channel, the second emitting light path channel and the light path return channel are respectively provided with a first sealing ring, a second sealing ring and a third sealing ring.
Preferably, the optical window is made of a light-transmitting material.
Preferably, the optical window is sapphire glass.
Preferably, the optical window pressing plate and the sealing end cover are both made of TC4 titanium alloy materials.
Preferably, one side of the sealing end cover is connected with the pressure-resistant cabin, and the sealing end cover and the pressure-resistant cabin are sealed through an axial sealing ring and a radial sealing ring.
Preferably, the optical window pressing plate, the sealing end cover and the pressure-resistant cabin are respectively provided with a first through hole, a second through hole and a fastening threaded hole which are coaxial, and the optical window pressing plate, the sealing end cover and the pressure-resistant cabin are sequentially connected through screws.
The embodiment of the invention provides a pressure self-balancing type deep sea instrument optical lens packaging structure, which has the following beneficial effects: according to the invention, by changing the sealing structure between the optical window pressing plate and the optical window, a gap is reserved at the contact part of the optical window pressing plate and the end face of the optical window, so that most of seawater pressure can be automatically balanced between the optical window pressing plate and the optical window, and the problems that the optical window is crushed due to high-pressure deformation of the optical window pressing plate and optical signals cannot be smoothly transmitted and converged due to external pressure deformation of the optical window are solved.
Drawings
FIG. 1 is a schematic structural diagram of an optical lens packaging structure of a pressure self-balancing deep sea instrument according to the present invention;
FIG. 2 is a schematic view of a connection structure of an optical lens packaging structure and a pressure-resistant cabin of the pressure self-balancing deep sea instrument of the invention;
FIG. 3 is a front view of the optical window of the present invention under force analysis in deep sea;
FIG. 4 is a side view of the optical lens package structure of the pressure self-balancing deep sea instrument of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 1;
fig. 6 is a schematic view of the optical window press and end cap seal configuration of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, fig. 1 is a schematic structural diagram of an optical lens packaging structure of a pressure self-balancing deep sea instrument according to the present invention; FIG. 2 is a schematic view of a connection structure of an optical lens packaging structure and a pressure-resistant cabin of the pressure self-balancing deep sea instrument of the invention; FIG. 3 is a front view of the optical window of the present invention under force analysis in deep sea; FIG. 4 is a side view of the optical lens package structure of the pressure self-balancing deep sea instrument of the present invention; FIG. 5 is an enlarged view of a portion of FIG. 1; fig. 6 is a schematic view of the optical window press and end cap seal configuration of the present invention.
The research finds that under the condition of huge external pressure of seven kilometers in deep sea, the optical observation window is easy to deform under the external pressure as follows:
(1) two end parts (an upper end part 1a1 and a lower end part 1b1) of the optical window pressing plate 1 are deformed by bending inwards under the pressure of deep sea, so that the contact part of the end part of the optical window pressing plate 1 and the upper end surface or the lower end surface of the optical window 2 generates a stress concentration phenomenon, and the optical window with extremely high brittleness is extruded and deformed or crushed;
(2) in the prior art, sealing rings are respectively arranged between the end part of an optical window pressing plate and the contact surface of an optical window and between the connecting positions of the optical window pressing plate and a sealing end cover, and are used for preventing seawater from entering from a gap between the contact surfaces of the optical window and the sealing end cover, so that the seawater enters a pressure-resistant cabin for storing an optical detection instrument along a light path emission channel and a return channel;
due to the existence of the sealing rings between the end part of the optical window pressing plate and the contact surface of the optical window and between the optical window pressing plate and the connecting position of the sealing end cover, the optical window can be acted by seawater unidirectional water pressure in the horizontal direction (namely the direction perpendicular to the optical window) (the other side of the optical window is a pressure-resistant cabin, and the interior of the pressure-resistant cabin is normal atmospheric pressure), and the optical window generates bending deformation or is crushed due to unbalanced stress.
Based on the above research, we have developed a pressure self-balancing type deep sea instrument optical lens packaging structure, including:
the end part of one side of the sealing end cover 4 is provided with a first annular gap 4 a;
the optical window pressing plate 1 is provided with a second annular gap 1a matched with the first annular gap 4a at one side end part of the optical window pressing plate 1, and the first annular gap 4a and the second annular gap 1a are spliced to form an annular groove, as shown in fig. 6;
and the optical window 2 is arranged in the annular groove, a gap D is reserved between the upper end surface of the optical window 2 and the inner top wall of the annular groove, and a gap is reserved between the lower end surface of the optical window 2 and the inner bottom wall of the annular groove.
The invention relates to a method for installing an optical lens packaging structure of a pressure self-balancing type deep sea instrument, which comprises the following steps: the optical window 2 is arranged in the annular groove, the optical window pressing plate 1 is connected with the sealing end cover 4, the optical window 2 is firmly fixed, and the optical window 2 is prevented from moving due to seawater pressure; and then, connecting the sealing end cover 4 on the packaging structure with the pressure-resistant cabin 13 to realize the connection of the packaging structure and the pressure-resistant cabin 13.
The application principle of the optical lens packaging structure of the pressure self-balancing type deep sea instrument is as follows:
(1) because no sealing ring is arranged between the end part of the optical window pressing plate and the contact surface of the optical window and between the connecting position of the optical window pressing plate and the sealing end cover, under the condition of huge external pressure of seven kilometers deep sea, even if the contact surfaces of the optical window pressing plate 1 and the optical window 2 are smooth, seawater can flow into the gap D through the gap between the contact surfaces of the optical window pressing plate 1 and the optical window 2 (because even if the contact surfaces of the optical window pressing plate 1 and the optical window 2 are smooth, but a plurality of gaps which can not be seen by naked eyes exist certainly, no sealing ring is arranged, water molecules can flow into the gap D from the gap between the contact surfaces of the optical window pressing plate 1 and the optical window 2), or seawater enters the gap D from the gap between the connecting positions of the optical window pressing plate and the sealing end cover, and at the moment, the internal side and the external side of the end part (the upper end part 1a1 and the lower end part 1b1) of the optical window pressing plate 1 are seawater pressure, therefore, the pressure of the optical window pressing plate 1 is balanced, the stress concentration phenomenon of the contact part of the optical window pressing plate 1 and the end face of the optical window 2 is solved, and the optical window with extremely high brittleness is prevented from being extruded and deformed or crushed;
(2) sealing rings are not arranged between the end part of the optical window pressing plate and the contact surface of the optical window and between the optical window pressing plate and the connecting position of the sealing end cover, so that seawater flows into the gap D along the contact gap between the optical window 2 and the optical window pressing plate 1, or seawater enters the gap D from the gap between the optical window pressing plate and the connecting position of the sealing end cover and then flows into the side edge (close to one side of the pressure-resistant cabin 13) of the optical window 2 from the gap D, the pressure of the seawater around the optical window 2 is basically kept consistent, the stress of the optical window 2 tends to be balanced, and the optical window 2 is prevented from being bent and deformed due to unbalanced stress; the arrow C is the water pressure direction, see fig. 3.
In the process that the submergence depth is from 0 meter to 7000 meters, the pressure of the external seawater is continuously increased, the pressure of the seawater around the optical window 2 is also continuously increased and is always equal to the pressure of the external seawater, so that the optical window can be adaptive to the change of the pressure of the external seawater, and the problem that optical signals cannot be collected at a hydrothermal part and return to a receiving lens group due to the bending deformation of the optical window 2 under the condition of deep sea high pressure is solved.
Preferably, a first emitting light path channel 8, a second emitting light path channel 12 and a light path return channel 10 are arranged on the end cover 4, and a first sealing ring 7, a second sealing ring 11 and a third sealing ring 9 are respectively arranged on the first emitting light path channel 8, the second emitting light path channel 12 and the light path return channel 10.
The first emitting optical path channel 8 and the second emitting optical path channel 12 are optical path signal emitting channels, and the optical path return channel 10 is an optical path signal receiving channel (see the direction of signal B in fig. 1); the second emission light path channel 12 and the light path return channel 10 are respectively provided with a first sealing ring 7, a second sealing ring 11 and a third sealing ring 9, and by arranging the first sealing ring 7, the second sealing ring 11 and the third sealing ring 9, seawater entering from a gap between the contact surfaces of the optical window and the sealing end cover is prevented from entering a pressure-resistant cabin 13 for storing an optical detection instrument along the light path emission and return channel.
Preferably, the inner surfaces of the first annular notch 4a and the second annular notch 1a are frosted surfaces or embossed surfaces; by setting the inner surfaces of the first annular notch 4a and the second annular notch 1a as frosted surfaces or embossed surfaces, the optical window pressing plate 1 and the sealing end cover 4 are ensured to compress the optical window 2 more firmly, and simultaneously, seawater flows in from the contact surface between the optical window 2 and the sealing end cover 4 more easily.
Preferably, the material of the optical window 2 is a light-transmitting material.
Preferably, the optical window 2 is sapphire glass; the sapphire glass can ensure enough strength and hardness, has higher light transmittance and chemical stability, can bear higher pressure and certain bending deformation, but cannot have larger bending deformation.
Preferably, the optical window pressing plate 1 and the sealing end cover 4 are both made of TC4 titanium alloy materials; the TC4 titanium alloy material can ensure that a packaging structure has enough strength and rigidity, and has lower density and better corrosion resistance during working, so that the invention can safely operate in the 7000 m deep sea high-pressure environment.
Preferably, one side of the end cover 4 is connected with the pressure chamber 13, and the end cover 4 and the pressure chamber 13 are sealed by the axial sealing ring 5 and the radial sealing ring 6, so as to prevent seawater from entering the pressure chamber 13 from the connecting position of the end cover 4 and the pressure chamber 13.
Preferably, the optical window pressing plate 1, the sealing end cover 4 and the pressure chamber 13 are respectively provided with a first through hole 3a, a second through hole 3b and a fastening threaded hole 3c which are coaxial, the optical window pressing plate 1, the sealing end cover 4 and the pressure chamber 13 are sequentially connected through screws, and the screws are preferably hexagon socket head cap screws.
The embodiment of the invention provides a pressure self-balancing type deep sea instrument optical lens packaging structure, which has the following beneficial effects: according to the invention, by changing the sealing structure between the optical window pressing plate and the optical window, a gap is reserved at the contact part of the optical window pressing plate and the end face of the optical window, so that most of seawater pressure can be automatically balanced between the optical window pressing plate and the optical window, and the problems that the optical window is crushed due to high-pressure deformation of the optical window pressing plate and optical signals cannot be smoothly transmitted and converged due to external pressure deformation of the optical window are solved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (7)
1. The utility model provides a pressure self-balancing type deep sea instrument optical lens packaging structure which characterized in that includes:
the end part of one side of the sealing end cover (4) is provided with a first annular gap (4 a);
the optical window pressing plate (1), a second annular notch (1a) matched with the first annular notch (4a) is arranged at one side end of the optical window pressing plate (1), and the first annular notch (4a) and the second annular notch (1a) are spliced to form an annular groove;
the optical window (2) is arranged in the annular groove, a gap (D) is reserved between the upper end face of the optical window (2) and the inner top wall of the annular groove, and a gap is reserved between the lower end face of the optical window (2) and the inner bottom wall of the annular groove;
the inner surfaces of the first annular notch (4a) and the second annular notch (1a) are frosted surfaces or embossed surfaces.
2. The optical lens packaging structure of the pressure self-balancing type deep sea instrument according to claim 1, wherein a first emitting light path channel (8), a second emitting light path channel (12) and a light path return channel (10) are disposed on the end cap (4), and a first sealing ring (7), a second sealing ring (11) and a third sealing ring (9) are disposed on the first emitting light path channel (8), the second emitting light path channel (12) and the light path return channel (10), respectively.
3. The optical lens package structure of pressure self-balancing deep-sea instrument according to claim 1, wherein the optical window (2) is made of a transparent material.
4. The optical lens package structure of pressure self-balancing deep-sea instrument according to claim 1, wherein the optical window (2) is sapphire glass.
5. The optical lens packaging structure of the pressure self-balancing type deep-sea instrument according to claim 1, wherein the optical window pressing plate (1) and the sealing end cap (4) are both made of TC4 titanium alloy material.
6. The optical lens packaging structure of the pressure self-balancing type deep-sea instrument according to claim 1, wherein one side of the end cap (4) is connected to the pressure chamber (13), and the end cap (4) and the pressure chamber (13) are sealed by an axial sealing ring (5) and a radial sealing ring (6).
7. The optical lens packaging structure of the pressure self-balancing type deep sea instrument according to claim 6, wherein the optical window pressing plate (1), the sealing end cover (4) and the pressure chamber (13) are respectively provided with a first through hole (3a), a second through hole (3b) and a fastening threaded hole (3c) which are coaxial, and the optical window pressing plate (1), the sealing end cover (4) and the pressure chamber (13) are sequentially connected through screws.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152775B (en) * | 2021-11-05 | 2024-01-12 | 安徽大学 | Deep sea hot liquid cold spring nozzle flow velocity measuring instrument based on optical Doppler and using method of instrument |
| CN114137251B (en) * | 2021-11-16 | 2024-01-16 | 安徽大学 | Integrated multipurpose laser Doppler flow velocity measuring instrument |
| CN115348760A (en) * | 2022-05-19 | 2022-11-15 | 史先德 | Crystal oscillator packaging structure suitable for deep sea high pressure environment |
| CN116761069B (en) * | 2023-08-18 | 2024-03-22 | 三亚深海科学与工程研究所 | Separated deep sea camera |
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| US6404560B1 (en) * | 1999-07-28 | 2002-06-11 | Nikon Corporation | Pressure proof optical apparatus |
| US6639745B1 (en) * | 2002-06-25 | 2003-10-28 | Kuo-Chung Cheng | Observation window of a hyperbaric chamber |
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