CN116296034A - Underwater pressure sensor - Google Patents

Underwater pressure sensor Download PDF

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Publication number
CN116296034A
CN116296034A CN202310250916.1A CN202310250916A CN116296034A CN 116296034 A CN116296034 A CN 116296034A CN 202310250916 A CN202310250916 A CN 202310250916A CN 116296034 A CN116296034 A CN 116296034A
Authority
CN
China
Prior art keywords
pressure
assembly
pressure sensing
piston
conduction
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.)
Pending
Application number
CN202310250916.1A
Other languages
Chinese (zh)
Inventor
耿合龙
冒家友
段文海
王火平
范赞
高嵩淳
吴武刚
吴家喜
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.)
Kunming Ship Equipment Research And Test Center 7500 Test Site Of China State Shipbuilding Corp Co Ltd
Original Assignee
Kunming Ship Equipment Research And Test Center 7500 Test Site Of China State Shipbuilding Corp Co Ltd
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 Kunming Ship Equipment Research And Test Center 7500 Test Site Of China State Shipbuilding Corp Co Ltd filed Critical Kunming Ship Equipment Research And Test Center 7500 Test Site Of China State Shipbuilding Corp Co Ltd
Priority to CN202310250916.1A priority Critical patent/CN116296034A/en
Publication of CN116296034A publication Critical patent/CN116296034A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
    • G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0618—Overload protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The invention discloses an underwater pressure sensor, comprising: the pressure conduction assembly is connected with the sensing end of the pressure sensing assembly and used for conducting external pressure to the pressure sensing assembly; the pressure sensing component is arranged on the marine underwater equipment; the sealant is arranged at the joint of the pressure conduction assembly and the pressure sensing assembly and is connected with the surface of the marine underwater equipment at the same time and is used for sealing the pressure sensing assembly and the pressure conduction assembly; the sealing component is arranged at the contact position of the pressure sensing component and the surface of the marine underwater equipment and is used for sealing the pressure sensing component; the pressure sensor conducts external pressure to the pressure sensing assembly through the pressure conducting assembly to carry out external pressure detection, and the inner element of the pressure sensing assembly is protected through the multi-layer sealing structure, so that the problem that seawater corrodes and damages the pressure sensing assembly for a long time is avoided, and the working time of underwater equipment can be effectively prolonged.

Description

Underwater pressure sensor
Technical Field
The invention relates to the technical field of underwater pressure sensors, in particular to an underwater pressure sensor, and especially relates to an anti-corrosion and anti-damage pressure sensor for marine underwater equipment.
Background
Along with the expansion of sea resource exploration from shallow sea to deep sea, more and more pressure sensors are put into use for realizing the measurement of parameters such as equipment water depth and the like, and the corrosion resistance and the anti-damage property of the pressure sensors become important technical indexes of the performance of the pressure sensors.
Most pressure sensors do not have the performance of long-term seawater corrosion prevention (chemical corrosion and electric corrosion) and damage prevention, after the pressure sensors are subjected to long-term seawater chemical corrosion, particularly after seawater passes through a pressure film water seepage entering circuit, the internal circuit of the pressure sensors is communicated with a shell, and the pressure sensors are subjected to the seawater chemical corrosion and simultaneously subjected to the electric corrosion, even seawater enters the equipment through the corrosion damage part of the pressure sensors, so that the whole underwater equipment fails to work, and serious loss is caused. In addition, the existing pressure sensor can generate unrecoverable physical damage after receiving pressure exceeding the range of the pressure sensor, so that seawater permeates into the equipment, the equipment is disabled, and serious loss is caused. Therefore, for these devices, maintenance and replacement of the underwater pressure sensor are required periodically. For equipment located deep in the deep sea, there is little operability of underwater replacement and maintenance, and the deployment and recovery costs are high. Therefore, how to design a deep water pressure sensor with high reliability for preventing chemical corrosion and electric corrosion of sea water for a long time for ocean deep water equipment becomes an important difficult problem to be solved in the technical field.
Disclosure of Invention
In order to solve the problems, the inventor provides an anti-corrosion and anti-damage pressure sensor for marine underwater equipment, which is used for conducting external pressure to a pressure sensing assembly through a pressure conducting assembly, and completely isolating the installation surface of the pressure sensing assembly from seawater in a vulcanization mode, so that long-term corrosion of the seawater to the pressure sensing assembly and damage of underwater foreign matters to a pressure film can be effectively avoided, and the working time of the underwater equipment can be effectively prolonged.
Specifically, the invention is realized as follows:
an underwater pressure sensor comprising:
the pressure sensing assembly is arranged on the marine underwater equipment, and the sensing end of the pressure sensing assembly is positioned on the surface of the marine underwater equipment;
and the pressure conduction assembly is connected with the sensing end of the pressure sensing assembly and is contacted with water when in use, and is used for conducting external pressure to the pressure sensing assembly.
And the sealing assembly is arranged at the contact part of the pressure sensing assembly and the surface of the marine underwater equipment and is used for sealing the pressure sensing assembly.
Further, the pressure conduction assembly includes:
a pressure conductive cover;
a compression assembly disposed within the pressure conductive housing and configured to move axially along the pressure conductive housing;
the pressure sensing device comprises a pressure sensing component, a pressure transmitting medium and a transmitting medium, wherein the pressure sensing component is arranged in the pressure transmitting cover, the transmitting medium is arranged between the pressure sensing component and the pressure transmitting component, the pressure transmitting component is compressed by external pressure, and pressure is transmitted to the pressure sensing component after the volume of the transmitting medium is compressed.
Further, the compression assembly includes:
the first piston is arranged in the pressure conduction cover and is matched with the pressure conduction cover, one side of the first piston is contacted with water, and the other side of the first piston is contacted with a conduction medium;
the second piston is positioned between the first piston and the pressure sensing component and is immersed in the conductive medium; the first piston compresses the second piston by external pressure, and then the second piston compresses a conducting medium between the second piston and the pressure sensing assembly, so that pressure is conducted to the pressure sensing assembly.
Further, an end of the pressure conductive cover, which is close to the pressure sensing component, is configured to be in a closed shape and used for blocking the second piston from further compressing the conductive medium.
Further, the pressure conduction assembly further comprises:
and the limiting piece is arranged at one end of the pressure conduction cover, which is far away from the pressure sensing assembly, and is used for limiting the distance of the first piston moving to the outside.
Further, the pressure sensing assembly includes:
the shell is arranged on the marine underwater equipment, the sealing assembly is positioned at the contact position of the shell and the surface of the marine underwater equipment, and a conducting hole is formed in one end, connected with the pressure conducting assembly, of the shell;
the strain film is arranged in the shell, is communicated with the pressure conduction assembly through the conduction hole and is used for sensing the external pressure conducted by the pressure conduction assembly;
the signal processing circuit is connected with the strain film through a watertight joint and is used for calculating an external pressure value according to the resistance value corresponding to the deformed strain film.
Further, the seal assembly includes:
the tetrafluoro pad is arranged between the shell and the outer surface of the marine underwater equipment;
the watertight ring is arranged between the shell and the inner surface of the marine underwater equipment.
Further, the conductive medium is oil.
Further, the underwater pressure sensor further includes: and the sealing glue is arranged at the joint of the pressure conduction assembly and the pressure sensing assembly, is simultaneously connected with the surface of the marine underwater equipment and is used for sealing the pressure sensing assembly and the pressure conduction assembly, and is vulcanized isolation glue.
Further, the limiting piece is a locating pin, and the locating pin penetrates through the pressure conduction cover along the radial direction of the pressure conduction cover.
The working principle of the invention is as follows:
the contact part of the pressure sensing component shell and the outer surface (mounting surface) of the marine underwater equipment is filled with a tetrafluoro pad, the contact part of the tetrafluoro pad and the inner surface (mounting hole) of the marine underwater equipment is provided with a watertight ring, after the pressure sensing component is mounted, vulcanized on the mounting surface by adopting vulcanized isolation glue, and the vulcanized isolation glue is completely contacted with the pressure conduction cover and the pressure sensing component at the same time, so that the pressure sensing component can be completely isolated from external seawater, and the corrosion of the seawater to the pressure sensing component is avoided.
When the external pressure changes, the pressure of the conducting medium in the pressure conducting cover and the external pressure are subjected to pressure difference, so that the first piston and the second piston move in the pressure conducting cover (move outwards or further compress the conducting medium), the external pressure is conducted to oil through the piston, the oil is conducted to the strain film, the strain film is changed in deformation, the corresponding resistance value of the strain film is changed after the strain film is deformed, and the external pressure value can be calculated through processing of the signal processing circuit.
Compared with the prior art, the invention has the beneficial effects that:
(1) The pressure transmission assembly is used for transmitting external water pressure to the pressure film, and meanwhile, the pressure sensor mounting surface is completely isolated from seawater in a vulcanization mode, so that long-term corrosion of the seawater to the pressure sensing assembly can be effectively avoided, and the working time of underwater equipment can be effectively prolonged.
(2) The device can effectively avoid the pressure film from being punctured and damaged by foreign matters, so that seawater enters the sensor; meanwhile, the pressure sensor is internally provided with a secondary watertight structure (watertight joint), so that equipment damage caused by the fact that seawater enters the sensor through the joint of the sensor transmission line after the sensor enters the sensor due to other factors can be avoided.
(3) The pressure conduction cover is configured to be in a closing-in shape, when the external pressure exceeds a threshold value, the second piston is clamped and limited, and the sensor damage caused by exceeding the measuring range of the sensor can be avoided.
Drawings
FIG. 1 is a schematic structural view of an anti-corrosion and anti-damage pressure sensor for marine underwater equipment in example 1;
fig. 2 is a sectional view showing a use state of the pressure sensor in embodiment 1;
fig. 3 is a schematic diagram of the pressure sensor in embodiment 1.
Reference numerals:
1-a pressure conducting component; 11-a pressure conductive cover; 12-a first piston; 13-a second piston; 14-a conductive medium; 15-locating pins; 2-a pressure sensing assembly; 21-a housing; 211-end caps; a 22-strain film; 23-watertight joint; 24-a signal processing circuit; 31-vulcanizing the isolation glue; a 32-tetrafluoro pad; 33-watertight ring; 4-a transmission cable; 5-marine underwater equipment surface.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides an anti-corrosion and anti-damage pressure sensor for marine underwater equipment, comprising: the pressure sensing component 2 is positioned in the marine underwater equipment, and the pressure conduction component 1 extends out of the outer surface of the marine underwater equipment, wherein the pressure conduction component 1 is arranged in seawater and is used for conducting external seawater pressure to the pressure sensing component 2, so that the value of external pressure is detected.
Specifically, the pressure conduction assembly includes: the pressure conduction cover 11, the compression assembly, the conduction medium 14 and the positioning pin 15, wherein the pressure conduction cover 11 is made of polytetrafluoroethylene and can not be corroded by seawater. The compression assembly and the conductive medium 14 are arranged inside the pressure conductive cover 11, and the pressure of the conductive medium 14 transmitted to the pressure sensing assembly 2 is changed by the action of the compression assembly.
The compression assembly includes: the first piston 12 and the second piston 13 are longitudinally distributed, the first piston 12 and the second piston 13 are matched with the pressure conduction cover 11, and when the external pressure changes, the shell longitudinally moves along the inside of the pressure conduction cover 11. The first piston is in contact with seawater on one side and with a conductive medium 14 on the other side, the second piston 13 is immersed in the conductive medium 14, preferably the material of the first piston 12 and the second piston 13 is neoprene, the outside is coated with a marine organism resistant material, the conductive medium 14 is HL hydraulic oil (trade mark 32), and the conductive medium 14 is filled between the second piston 13 and the pressure sensing assembly 2. Under the external pressure, the first piston 12 can move back and forth in the pressure conduction cover 11, so that the volume of the conduction medium 14 between the first piston 12 and the second piston 13 is changed, the second piston 13 is further caused to move, the volume of the conduction medium 14 between the second piston 13 and the pressure sensing assembly 2 is changed, and the pressure is conducted to the pressure sensing assembly 2 by the conduction medium 14 after the volume change, so that the pressure conduction work is completed.
The positioning pin 15 is disposed at an end of the pressure conduction cover 11 near the seawater, and penetrates the pressure conduction cover 11 along a radial direction of the pressure conduction cover 11, so as to block the first piston 11 from moving outwards, so as to ensure that the first piston 11 is located inside the pressure conduction cover 11. In the same way, the pressure conduction cover 11 is configured to be a closed structure near one end of the pressure sensing component 2, in this embodiment, a boss structure is adopted, and a conduction hole for the conduction medium 14 to pass through is formed in the middle of the boss.
Further, the pressure sensing assembly 2 includes: the shell 21, the strain film 22 and the signal processing circuit 24, wherein the shell 21 is arranged at the outer side of the surface 5 of the marine underwater equipment and is an end cover 211, the shell 21 is arranged inside the marine underwater equipment and is a shell 21 main body, the end cover 211 is provided with a through hole coaxial with the conducting hole, the strain film 22 is arranged inside the shell 21 main body, and the conducting medium 14 is contacted with the strain film 22 after passing through the conducting hole and the through hole. After the pressure is too high, the conducting medium 14 is compressed to a certain extent, the boss is contacted with the second piston 13, the second piston 14 is prevented from further moving, the larger pressure is prevented from being conducted to the strain membrane 22, and the seawater pressure is prevented from being damaged due to the fact that the pressure value is set to be lower than the breaking pressure of the strain membrane 22, and the seawater pressure is prevented from being transmitted to exceed the measuring range of the pressure sensing assembly 2.
The tail end of the shell 21 is connected with a signal processing circuit 24 by adopting a watertight connector 23, the strain film 22 is connected with the watertight connector 23 through a signal wire, the signal processing circuit 24 is connected with marine underwater equipment through a transmission cable 4, under different pressure conditions, pressure is conducted to the strain film 22 after the volume of the conducting medium 14 is changed, the strain film 22 is caused to deform, the corresponding resistance value of the strain film 22 can be changed after the strain film 22 deforms, and then the external pressure value can be calculated through processing of the signal processing circuit 24.
In order to ensure the sealing between the main body of the shell 21 and the end cover 211, the marine underwater equipment surface 5 and the pressure conduction cover 11, a tetrafluoro pad 32 is arranged at the contact position of the end cover 211 and the outer side of the marine underwater equipment surface 5, a watertight ring 33 is arranged at the contact position of the main body of the shell 21 and the inner side of the marine underwater equipment surface 5, and the joints of the tetrafluoro pad 32, the end cover 211 and the pressure conduction cover 11 are sealed by adopting vulcanized isolation glue 31. The sealing treatment is respectively carried out on the two sides of the surface 5 of the marine underwater equipment, and meanwhile, the vulcanizing treatment by using the vulcanized isolation glue 31 is adopted at the installation positions of the tetrafluoro pad 32, the end cover 211 and the pressure conduction cover 11, so that the pressure sensing assembly 2 can be completely isolated from the external seawater, the corrosion of the seawater is avoided, and meanwhile, the pressure conduction cover 11 and the vulcanized isolation glue 31 have the characteristic of being not corroded by the seawater, and the pressure sensor can be ensured to be reliably positioned under water for a long time.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.

Claims (10)

1. An underwater pressure sensor, comprising:
the pressure sensing assembly is arranged on the marine underwater equipment, and the sensing end of the pressure sensing assembly is positioned on the surface of the marine underwater equipment;
the pressure conduction assembly is connected with the sensing end of the pressure sensing assembly, is contacted with water when in use, and is used for conducting external pressure to the pressure sensing assembly;
and the sealing assembly is arranged at the contact part of the pressure sensing assembly and the surface of the marine underwater equipment and is used for sealing the pressure sensing assembly.
2. The subsea pressure sensor of claim 1, where the pressure conducting assembly comprises:
a pressure conductive cover;
a compression assembly disposed within the pressure conductive housing and configured to move axially along the pressure conductive housing;
the pressure sensing device comprises a pressure sensing component, a pressure transmitting medium and a transmitting medium, wherein the pressure sensing component is arranged in the pressure transmitting cover, the transmitting medium is arranged between the pressure sensing component and the pressure transmitting component, the pressure transmitting component is compressed by external pressure, and pressure is transmitted to the pressure sensing component after the volume of the transmitting medium is compressed.
3. The subsea pressure sensor of claim 2, where the compression assembly comprises:
the first piston is arranged in the pressure conduction cover and is matched with the pressure conduction cover, one side of the first piston is contacted with water, and the other side of the first piston is contacted with a conduction medium;
the second piston is positioned between the first piston and the pressure sensing component and is immersed in the conductive medium; the first piston compresses the second piston by external pressure, and then the second piston compresses a conducting medium between the second piston and the pressure sensing assembly, so that pressure is conducted to the pressure sensing assembly.
4. A subsea pressure sensor as claimed in claim 3, wherein the pressure conducting cap is arranged in a necked-in configuration near one end of the pressure sensing assembly for blocking further compression of the conducting medium by the second piston.
5. The subsea pressure sensor of claim 4, where the pressure conducting assembly further comprises:
and the limiting piece is arranged at one end of the pressure conduction cover, which is far away from the pressure sensing assembly, and is used for limiting the distance of the first piston moving to the outside.
6. The subsea pressure sensor of claim 1, where the pressure sensing assembly comprises:
the shell is arranged on the marine underwater equipment, the sealing assembly is positioned at the contact position of the shell and the surface of the marine underwater equipment, and a conducting hole is formed in one end, connected with the pressure conducting assembly, of the shell;
the strain film is arranged in the shell, is communicated with the pressure conduction assembly through the conduction hole and is used for sensing the external pressure conducted by the pressure conduction assembly;
the signal processing circuit is connected with the strain film through a watertight joint and is used for calculating an external pressure value according to the resistance value corresponding to the deformed strain film.
7. The subsea pressure sensor of claim 6, where the sealing assembly comprises:
the tetrafluoro pad is arranged between the shell and the outer surface of the marine underwater equipment;
the watertight ring is arranged between the shell and the inner surface of the marine underwater equipment.
8. The underwater pressure sensor as in claim 5, wherein the stop is a locating pin extending radially through the pressure transmission housing.
9. The underwater pressure sensor as claimed in any one of claims 1 to 8, further comprising a sealant provided at the junction of the pressure conduction assembly and the pressure sensing assembly, the sealant being simultaneously connected to the surface of the marine underwater device for sealing the pressure sensing assembly and the pressure conduction assembly, the sealant being a vulcanized isolation glue.
10. An underwater pressure sensor as claimed in any of claims 2 to 5 wherein the conductive medium is oil.
CN202310250916.1A 2023-03-15 2023-03-15 Underwater pressure sensor Pending CN116296034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310250916.1A CN116296034A (en) 2023-03-15 2023-03-15 Underwater pressure sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310250916.1A CN116296034A (en) 2023-03-15 2023-03-15 Underwater pressure sensor

Publications (1)

Publication Number Publication Date
CN116296034A true CN116296034A (en) 2023-06-23

Family

ID=86795621

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310250916.1A Pending CN116296034A (en) 2023-03-15 2023-03-15 Underwater pressure sensor

Country Status (1)

Country Link
CN (1) CN116296034A (en)

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