CN110082030B - Pressure switching module for calibrating optical fiber pressure sensor - Google Patents
Pressure switching module for calibrating optical fiber pressure sensor Download PDFInfo
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- CN110082030B CN110082030B CN201910440754.1A CN201910440754A CN110082030B CN 110082030 B CN110082030 B CN 110082030B CN 201910440754 A CN201910440754 A CN 201910440754A CN 110082030 B CN110082030 B CN 110082030B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 94
- 238000007789 sealing Methods 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 238000003825 pressing Methods 0.000 claims abstract description 23
- 238000012546 transfer Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 1
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 1
- 241001330002 Bambuseae Species 0.000 abstract 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 1
- 239000011425 bamboo Substances 0.000 abstract 1
- 238000012512 characterization method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure switching module for calibrating an optical fiber pressure sensor, which comprises a valve body, a connector, at least two sealing cylinders, at least one pressing block and at least one threaded sleeve. The valve body is internally provided with a liquid flow passage, the valve body is provided with at least two half through holes, the first ends of the half through holes are communicated with the liquid flow passage, and the second ends of the half through holes extend to the surface of the valve body and are threaded holes. The connector is fixed at the first end of the liquid flow channel, and the sealing cylinder is provided with a cavity and is of a through structure. The first end and the threaded hole threaded connection of sealed section of thick bamboo, the cavity passes through screw and half through-hole intercommunication. The pressing block is provided with a channel for the optical cable to pass through, the side walls of the pressing block and the threaded sleeve are provided with strip-shaped notches along the direction of the bus, and the threaded sleeve is used for being in threaded connection with the second end of the sealing cylinder. The optical fiber pressure sensor calibration device is compact in structure, simple to process and manufacture and convenient to use, calibration efficiency of the optical fiber pressure sensor can be greatly improved while calibration accuracy is not affected, and labor hour consumption and labor intensity are reduced.
Description
Technical Field
The invention relates to the technical field of pressure sensor calibration devices, in particular to a pressure switching module capable of calibrating a plurality of optical fiber pressure sensors simultaneously.
Background
The pressure sensor is widely applied to various technical fields of ocean observation and monitoring. A pressure sensor is a device or apparatus that senses a pressure signal and converts the pressure signal to a usable output signal according to a certain law. The pressure sensors commonly used at present are mostly electronic pressure sensors, and can be classified into piezoresistive pressure sensors, piezoelectric pressure sensors and the like according to different measurement principles. With the rapid development of optical fiber sensing technology, various optical fiber pressure sensors for ocean observation and monitoring have been developed.
An optical fiber pressure sensor is a sensor that converts sea water pressure into a measurable optical signal. The optical fiber pressure sensor is generally mainly composed of a pressure sensing element, an optical cable, an FC joint and the like. One end of the optical cable is connected with the pressure sensing element, and the other end of the optical cable is connected with the FC connector. The working principle of the optical fiber pressure sensor is that the light beam incident by the light source is sent into the pressure sensing element through the optical cable, the wavelength of the light beam is changed under the interaction between the pressure sensing element and the external pressure, the light beam becomes a light signal which can be modulated, and then the light signal is sent back through the optical cable, and the pressure parameter to be measured is obtained after demodulation by the demodulator. Optical fiber pressure sensors have many advantages over electronic pressure sensors: anti-electromagnetic and anti-antigenic radiation anti-interference properties; thin diameter, soft texture, light weight mechanical properties; insulation, non-inductive electrical properties; water-resistant, high-temperature resistant, corrosion resistant chemical properties, etc.
Before leaving the factory, the optical fiber pressure sensor must be calibrated, and the calibration process generally follows the following steps: the pressure sensing element is connected with pressure calibration equipment through a switching tool, and the FC joint is connected with the demodulator. Recording a characterization pressure value of the pressure calibration equipment and wavelength data of the optical fiber pressure sensor from 0 MPa; then gradually boosting the pressure calibration equipment, pausing boosting when 1MPa is added, and recording the characterization pressure value and the wavelength data; and stopping boosting until the pressure is increased to a pressure value specified by the index range of the optical fiber pressure sensor. Then reducing the pressure at intervals of 1MPa until the pressure reaches 0MPa, and continuously and sequentially recording the characterization pressure value and the wavelength data. And respectively performing curve fitting on the pressure value recorded in the step-up/step-down process and the corresponding wavelength data to obtain the calibration coefficient of the optical fiber pressure sensor. Substituting the calibration coefficient and wavelength data recorded in the buck/boost process into a calibration formula to obtain a pressure value measured by the optical fiber pressure sensor, and comparing the pressure value with a characterization pressure value of pressure calibration equipment to obtain a calibration error of the optical fiber pressure sensor.
The length of the optical cable of the optical fiber pressure sensor is mainly determined by the distance from the demodulator of the application environment of the optical fiber pressure sensor. After the optical fiber pressure sensor is calibrated, the optical cable is not lengthened or shortened any more, because the optical cable is required to be welded no matter the optical cable is lengthened or shortened, the optical cable is welded to generate the phenomenon of optical signal attenuation, and the measurement accuracy is affected; in addition, the welding points of the optical cable are required to be stressed and sealed and protected after the optical cable is welded, so that the risks of breaking the optical cable and corrosion by seawater are increased. Therefore, the fiber optic pigtail of the fiber optic pressure sensor can be hundreds of meters or even thousands of meters at maximum during calibration.
According to different sealing forms, the common structural forms of the high-precision optical fiber pressure sensor are cylindrical sealing and end face sealing. The cylindrical surface sealing type optical fiber pressure sensor is cylindrical in shape, and a sealing ring groove is formed in the outer portion of the cylinder and is used for installing an O-shaped ring. The end of the end face sealing type optical fiber pressure sensor is provided with a fastening thread, and a sealing gasket is arranged at the joint of the fastening thread and the sensor.
Because the optical fiber pressure sensor and the traditional pressure sensor have the differences in structural form and measurement principle, the common adapter for calibrating the pressure sensor cannot adapt to the calibration requirement of the optical fiber pressure sensor. In addition, when the optical fiber pressure sensor is produced in batches, calibration work of a large number of optical fiber pressure sensors needs to be carried out, and if a method of calibrating only one optical fiber pressure sensor at a time by using one pressure calibration device is still adopted, the problems of large workload, high labor intensity, low equipment utilization rate and the like can be caused. Therefore, it is very necessary to develop a pressure switching module capable of calibrating a plurality of optical fiber pressure sensors simultaneously, so as to improve the calibration efficiency of the optical fiber pressure sensors and reduce the labor hour consumption and the labor intensity. In addition, in order to meet the calibration requirements of the optical fiber pressure sensors with different structural forms, the pressure switching module has certain universality and can be compatible with the optical fiber pressure sensors with the two structural forms.
Because friction exists between the pressure medium used by the pressure calibration equipment and the pipeline inside the pressure switching module, certain pressure loss can be generated, and thus the calibration precision is affected. The main factors affecting the pressure loss include: pipeline roughness and length. The length of the pipeline is mainly determined by the number of the sensor mounting interfaces reserved on the pressure switching module. The number of the mounting interfaces is increased, the longer the pipeline length is, the larger the pressure loss is, and the lower the calibration precision is, so that the number of the sensor mounting interfaces reserved on the pressure switching module is not excessive.
However, for the optical fiber pressure sensor with lower measurement accuracy index requirement, the pressure loss caused by the pressure switching module has less influence on the calibration result of the sensor. Under the condition that the pipeline roughness is determined, a reserved sensor mounting interface can be properly increased, and the calibration efficiency is improved.
Therefore, in order to meet the calibration requirements of the optical fiber pressure sensors with different precision, the processing precision of the pressure switching module is improved, the processing difficulty is reduced, and the pressure switching module has certain expansibility.
Disclosure of Invention
The invention aims to provide a pressure switching module suitable for calibrating a plurality of optical fiber pressure sensors at the same time, which is used for solving the problem that an existing switching head for calibrating the pressure sensors cannot meet the requirement when calibrating a large number of optical fiber pressure sensors.
In order to achieve the above object, the present invention provides the following solutions:
the invention discloses a pressure switching module for calibrating an optical fiber pressure sensor, which comprises:
the valve body is internally provided with a liquid flow passage, a first end of the liquid flow passage extends to the surface of the valve body, the valve body is provided with at least two half through holes, the first end of each half through hole is communicated with the liquid flow passage, and a second end of each half through hole extends to the surface of the valve body and is a threaded hole;
the connector is fixed at the first end of the liquid flow channel and is used for being in sealing connection with an output pipe connector of the pressure calibration equipment so that the liquid flow channel is communicated with an output pipe of the pressure calibration equipment;
the sealing cylinders are provided with cavities and are of through structures, the first ends of the sealing cylinders are in threaded connection with the threaded holes, the cavities are communicated with the semi-through holes through screw holes, the cavities are used for accommodating pressure sensing elements of the optical fiber pressure sensors, the screw holes can be in threaded connection with studs of the end face sealing type optical fiber pressure sensors, the side walls of the cavities can be in sealed connection with cylindrical sealing rings of the cylindrical sealing type optical fiber pressure sensors, and the second ends of the sealing cylinders are provided with external threads;
the pressure sensing device comprises at least one pressure block, a pressure sensor and a pressure sensor, wherein the pressure block is provided with a channel for an optical cable to pass through, a strip-shaped notch is formed in the side wall of the pressure block along the direction of a bus, and the pressure block is used for propping against one end face of a connecting optical cable on a pressure sensing element of the cylindrical surface sealed optical fiber pressure sensor;
the side wall of the screw sleeve is provided with a strip-shaped notch along the direction of a bus, the screw sleeve is used for being in threaded connection with the second end of the sealing cylinder for accommodating the pressure sensing element of the cylindrical surface sealing type optical fiber pressure sensor, and the screw sleeve is used for enabling the pressing block to press the pressure sensing element of the cylindrical surface sealing type optical fiber pressure sensor.
Preferably, the valve further comprises a guide pipe and an end cover, wherein the first end of the liquid flow channel is provided with internal threads, the connector is in threaded connection with the first end of the liquid flow channel, the second end of the liquid flow channel extends to the surface of the valve body, n guide pipes are arranged, n-1 guide pipes are arranged, one end cover is arranged, n is larger than or equal to 2, one end of each guide pipe is used for being inserted into one of the valve bodies, the second ends of the liquid flow channels are in sealing connection, the other end of each guide pipe is used for being in threaded connection with the first ends of the liquid flow channels on the other valve body, two adjacent valve bodies are locked through fasteners, and the end cover is used for sealing the second ends of the liquid flow channels of one valve body positioned at the end.
Preferably, the valve body comprises a left panel, a cross block and a right panel, the left panel and the right panel are respectively connected with two ends of the cross block integrally, a first end of the liquid flow channel is positioned on the left panel, a second end of the liquid flow channel is positioned on the right panel, and the liquid flow channel is coaxial with the cross block.
Preferably, the cross block has four ribs extending longitudinally, the second end of the half through hole is located on a side of the rib away from the axis of the cross block, and the axis of the half through hole is perpendicular to the axis of the cross block.
Preferably, the number of the half through holes is six, and each two half through holes are positioned in one rib plate.
Preferably, the end cap has a columnar protrusion thereon for insertion into and sealing connection with the second end of the liquid flow passage of one of the valve bodies at the end.
Preferably, the two end surfaces of the connector, the right end surface of the valve body and the plane on the sealing cylinder, which is used for propping against the valve body, are all provided with annular grooves, and sealing rings are arranged in the annular grooves.
Preferably, the pressure sensor further comprises a cylindrical plug, the shape of the cylindrical plug is consistent with that of a pressure sensing element of the cylindrical sealed optical fiber pressure sensor, a sealing ring is arranged in an annular groove on the cylindrical surface of the cylindrical plug, and the cylindrical plug is fixed in one sealing cylinder through one pressing block and one threaded sleeve.
Compared with the prior art, the invention has the following technical effects:
when the pressure transfer module for calibrating the optical fiber pressure sensors is applied, after the optical fiber pressure sensors are installed on each transfer clamp, the connectors are connected with output pipes of pressure calibration equipment, so that calibration work of a plurality of optical fiber pressure sensors can be realized. After the calibration is finished, the calibrated optical fiber pressure sensor can be quickly taken out by unscrewing the threaded sleeve, and a new sensor is replaced. If necessary, two or more pressure switching modules can be connected in series by using a conducting pipe, so that the number of simultaneously calibrated sensors is increased, and the working efficiency is improved.
The optical fiber pressure sensor calibration device is compact in structure, simple to process and manufacture and convenient to use, calibration efficiency of the optical fiber pressure sensor can be greatly improved while calibration accuracy is not affected, and labor hour consumption and labor intensity are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a pressure switching module for calibrating an optical fiber pressure sensor;
FIG. 2 is an axial view of the valve body structure;
FIG. 3 is a front cross-sectional view of the valve body;
FIG. 4 is a top cross-sectional view of the valve body;
FIG. 5 is a front cross-sectional view of a pressure transfer module with two different configurations of pressure sensors installed;
FIG. 6 is a schematic diagram of a cylindrical sealed fiber optic pressure sensor assembly;
FIG. 7 is a schematic diagram of an end-face sealed fiber optic pressure sensor assembly;
FIG. 8 is a front cross-sectional view of two pressure transfer modules in series;
FIG. 9 is a serial axial view of a pressure transfer module;
reference numerals illustrate: 1. a connector; 2. a valve body; 3. a transfer clamp; 4. an end cap; 5. cylindrical sealed optical fiber pressure sensor; 6. an end face sealed optical fiber pressure sensor; 7. a conduit; 8. a cylindrical plug; 9. a screw; 20. screw holes; 21. a left end face; 22. an upper end surface; 23. a right end face; 24. a rear end face; 25. a front end face; 26. a liquid flow channel; 27. a half-through hole; 28. a threaded aperture; 29. a light hole; 31. a sealing cylinder; 32. a screw sleeve; 33. briquetting; 34. a screw hole; 35. a cavity; 36. a strip-shaped notch; 51. a pressure sensing element; 52. an optical cable; fc linker; an o-ring mounting groove; 55. a gasket mounting position; 56. a stud.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a pressure switching module suitable for calibrating a plurality of optical fiber pressure sensors at the same time, which is used for solving the problem that an existing switching head for calibrating the pressure sensors cannot meet the requirement when calibrating a large number of optical fiber pressure sensors.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 9, the present embodiment provides a pressure switching module for calibrating an optical fiber pressure sensor, which includes a valve body 2, a connector 1, at least two sealing cylinders 31, at least one pressing block 33 and at least one screw sleeve 32.
Wherein the valve body 2 is internally provided with a liquid flow passage 26, and a first end of the liquid flow passage 26 extends to the surface of the valve body 2. The valve body 2 is provided with at least two half through holes 27, a first end of each half through hole 27 is communicated with the liquid flow channel 26, and a second end of each half through hole 27 extends to the surface of the valve body 2 and is provided with a threaded hole 28. The connector 1 is fixed at a first end of the liquid flow channel 26, and the connector 1 is used for being in sealing connection with an output pipe connector of the pressure calibration device, so that the liquid flow channel 26 is communicated with an output pipe of the pressure calibration device. The sealing cylinder 31 has a cavity 35 and is of a through structure, a first end of the sealing cylinder 31 is in threaded connection with the threaded hole 28, the cavity 35 is communicated with the semi-through hole 27 through a screw hole 34, the cavity 35 is used for accommodating a pressure sensing element 51 of the optical fiber pressure sensor, the screw hole 34 can be in threaded connection with a stud 56 of the end face sealing type optical fiber pressure sensor 6, a side wall of the cavity 35 can be in sealed connection with a cylindrical sealing ring of the cylindrical sealing type optical fiber pressure sensor 5, and a second end of the sealing cylinder 31 is provided with external threads. The pressing block 33 is provided with a channel for the optical cable 52 to pass through, a strip-shaped notch 36 is formed in the side wall of the pressing block 33 along the direction of a bus, and the pressing block 33 is used for abutting against one end face of the connecting optical cable 52 on the pressure sensing element 51 of the cylindrical sealed optical fiber pressure sensor 5. The side wall of the screw sleeve 32 is provided with a strip-shaped notch 36 along the direction of a bus, the screw sleeve 32 is used for being in threaded connection with the second end of the sealing cylinder 31 for accommodating the pressure sensing element 51 of the cylindrical sealing type optical fiber pressure sensor 5, and the screw sleeve 32 is used for enabling the pressing block 33 to press the pressure sensing element 51 of the cylindrical sealing type optical fiber pressure sensor 5.
When the pressure switching module of the embodiment is used, corresponding installation modes are selected according to different optical fiber pressure sensors to be calibrated. For the end face seal type optical fiber pressure sensor 6, it includes a stud 56, a pressure sensing element 51, an optical cable 52, and an FC connector 53, which are connected in this order. The end face of the pressure sensing element 51 for mounting the stud 56 is typically a gasket mounting location 55 for mounting a gasket, and the gasket is sleeved on the stud 56. When the end-face-seal type optical fiber pressure sensor 6 is connected to the valve body 2, the pressure sensing element 51 of the end-face-seal type optical fiber pressure sensor 6 is placed in the cavity 35 of the seal tube 31, and the pressure sensing element 51 is rotated until the pressure sensing element 51 and the corresponding seal tube 31 clamp the gasket. The cylindrical sealed optical fiber pressure sensor 5 comprises a pressure sensing element 51, an optical cable 52 and an FC connector 53 which are connected in sequence, wherein the side surface of the pressure sensing element 51 is provided with an O-shaped ring mounting groove 54, and an O-shaped ring is mounted in the mounting groove. When the cylindrical sealed optical fiber pressure sensor 5 is connected with the valve body 2, the pressure sensing element 51 of the cylindrical sealed optical fiber pressure sensor 5 is placed in the cavity 35 of the sealing cylinder 31, the optical cable 52 enters the channel for the optical cable 52 to pass through the strip-shaped notch 36 of the pressing block 33, the optical cable 52 enters the screw sleeve 32 through the strip-shaped notch 36 of the screw sleeve 32, and the pressing block 33 and the pressure sensing element 51 of the cylindrical sealed optical fiber pressure sensor 5 are pressed down together through rotating the screw sleeve 32. After the screw sleeve 32 is locked with the sealing cylinder 31, the screw sleeve 32 and the strip-shaped notch 36 of the pressing block 33 are staggered, so that the optical cable 52 is prevented from sliding out of the strip-shaped notch 36. The width of the strip-shaped notch 36 is slightly larger than the diameter of the optical cable 52, so that the pressing block 33 and the threaded sleeve 32 can be quickly sleeved on the optical cable 52 without penetrating the pressing block 33 and the threaded sleeve 32 from the FC joint 53 at the tail end of the optical cable 52 of hundreds of meters.
Because the pressure switching module of the embodiment is provided with at least two sealing cylinders 31, a plurality of optical fiber pressure sensors can be installed at the same time, and the calibration efficiency is improved. Different mounting modes can be selected according to different types of optical fiber pressure sensors to be calibrated. The pressure sensing element 51 can be directly rotated for the end face sealing type optical fiber pressure sensor 6 to be installed, the switching clamp 3 is a sealing cylinder 31, and the cylindrical face sealing type optical fiber pressure sensor 5 can be installed through a pressing block 33 and a screw sleeve 32, and the switching clamp 3 is the sealing cylinder 31, the pressing block 33 and the screw sleeve 32. Therefore, the pressure switching module of the embodiment can be compatible with two types of optical fiber pressure sensors, improves the utilization rate of equipment, and has good universality. After the optical fiber pressure sensors are arranged on the switching fixtures 3, the connector 1 is connected with an output pipe of the pressure calibration equipment, so that calibration work of a plurality of optical fiber pressure sensors can be realized. After the calibration is completed, the calibrated optical fiber pressure sensor can be quickly taken out by unscrewing the threaded sleeve 32, and a new sensor can be replaced.
When a pressure switching module cannot meet the installation requirement of the optical fiber pressure sensor, in order to improve the calibration efficiency, the embodiment further comprises a conducting pipe 7 and an end cover 4. The first end of the liquid flow channel 26 is provided with an internal thread, the connector 1 is in threaded connection with the first end of the liquid flow channel 26, and the second end of the liquid flow channel 26 extends to the surface of the valve body 2. The number of the valve bodies 2 is n, the number of the conducting pipes 7 is n-1, the number of the end covers 4 is one, and n is more than or equal to 2. One end of the conduit 7 is cylindrical and is used for being inserted into a second end of the liquid flow channel 26 on the valve body 2 and is in sealing connection. The other end of the conduit 7 is a threaded surface for threaded connection with a first end of a fluid flow passage 26 on the other valve body 2. The two adjacent valve bodies 2 are locked by the fastener, the end cover 4 is used for sealing the second end of the liquid flow passage 26 of one valve body 2 positioned at the end, and the end cover 4 is a flange cover.
The pressure switching modules are connected in series through the conduction pipe 7, so that the calibration requirement of any number of optical fiber pressure sensors can be met. Through making the first end of liquid runner 26 have the internal thread, can install and remove conduction pipe 7 and connector 1 through rotatory mode fast, improve demarcation efficiency. In order to achieve the series assembly, the present embodiment extends the second end of the liquid flow channel 26 to the surface of the valve body 2, and when the pressure switching module is only one, the second end of the liquid flow channel 26 needs to be sealed by the end cap 4.
In order to reduce the weight of the valve body 2, the valve body 2 of the present embodiment includes a left panel, a cross block, and a right panel, which are integrally connected to both ends of the cross block, respectively. The first end of the liquid flow channel 26 is located on the left panel and the second end of the liquid flow channel 26 is located on the right panel, the liquid flow channel 26 being coaxial with the cross. The valve body 2 is a metal block, and a cross block in the middle of the valve body 2 is formed by milling. The cross has four ribs extending longitudinally, and the second end of the half through hole 27 is located on the side of the rib away from the axis of the cross, the axis of the half through hole 27 being perpendicular to the axis of the cross. The right panel is provided with screw holes 20, the left panel is provided with light holes 29 opposite to the screw holes 20, and the left panel and the right panel of two adjacent valve bodies 2 can be locked by the screws 9.
In this embodiment, the number of the half through holes 27 is six, the number of the corresponding sealing cylinders 31 is also six, the number of the pressing blocks 33 and the screw sleeves 32 is selected according to the requirement, and every two half through holes 27 are located in one rib plate. Taking the perspective of fig. 1, 2 and 9 as an example, the second end of the half through hole 27 is located at the front end face 25, the rear end face 24 and the upper end face 22 of the valve body 2, respectively, the connector 1 is mounted on the left end face 21 of the valve body 2, and the end cap 4 is mounted on the right end face 23 of the valve body 2.
In order to make the sealing effect of the end cap 4 better, the end cap 4 of this embodiment has a columnar protrusion, which is inserted into the second end of the liquid flow channel 26 of one valve body 2 at the end and is connected in a sealing manner.
In order to improve the tightness of other connection positions, in this embodiment, annular grooves are formed on the two end surfaces of the connector 1, the right end surface 23 of the valve body 2, and the plane on the sealing cylinder 31, which is used for abutting against the valve body 2, and sealing rings are arranged in the annular grooves.
In this embodiment, the number of half through holes 27 is six, and when the number of fiber pressure sensors actually required to be calibrated is not an integer multiple of six, the redundant half through holes 27 need to be blocked. For this reason, the present embodiment further includes a cylindrical plug 8, the shape of the cylindrical plug 8 is identical to the shape of the pressure sensing element 51 of the cylindrical sealed optical fiber pressure sensor 5, a sealing ring is also disposed in the annular groove on the cylindrical surface of the cylindrical plug 8, the cylindrical plug 8 is fixed in one of the sealing cylinders 31 through a pressing block 33 and a threaded sleeve 32, and the installation manner of the pressing block 33 and the threaded sleeve 32 is identical to the installation manner of the pressing block 33 and the threaded sleeve 32 corresponding to the cylindrical sealed optical fiber pressure sensor 5.
The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. A pressure transfer module for optical fiber pressure sensor calibration, comprising:
the valve body is internally provided with a liquid flow passage, a first end of the liquid flow passage extends to the surface of the valve body, the valve body is provided with at least two half through holes, the first end of each half through hole is communicated with the liquid flow passage, and a second end of each half through hole extends to the surface of the valve body and is a threaded hole;
the connector is fixed at the first end of the liquid flow channel and is used for being in sealing connection with an output pipe connector of the pressure calibration equipment so that the liquid flow channel is communicated with an output pipe of the pressure calibration equipment;
the sealing cylinders are provided with cavities and are of through structures, the first ends of the sealing cylinders are in threaded connection with the threaded holes, the cavities are communicated with the semi-through holes through screw holes, the cavities are used for accommodating pressure sensing elements of the optical fiber pressure sensors, the screw holes can be in threaded connection with studs of the end face sealing type optical fiber pressure sensors, the side walls of the cavities can be in sealed connection with cylindrical sealing rings of the cylindrical sealing type optical fiber pressure sensors, and the second ends of the sealing cylinders are provided with external threads;
the pressure sensing device comprises at least one pressure block, a pressure sensor and a pressure sensor, wherein the pressure block is provided with a channel for an optical cable to pass through, a strip-shaped notch is formed in the side wall of the pressure block along the direction of a bus, and the pressure block is used for propping against one end face of a connecting optical cable on a pressure sensing element of the cylindrical surface sealed optical fiber pressure sensor;
the side wall of the screw sleeve is provided with a strip-shaped notch along the direction of a bus, the screw sleeve is in threaded connection with the second end of the sealing cylinder for accommodating the pressure sensing element of the cylindrical sealing type optical fiber pressure sensor, and the screw sleeve is used for enabling the pressing block to press the pressure sensing element of the cylindrical sealing type optical fiber pressure sensor;
the pressure switching module for calibrating the optical fiber pressure sensor further comprises a guide pipe and an end cover, wherein the first end of the liquid flow channel is provided with internal threads, the connector is in threaded connection with the first end of the liquid flow channel, the second end of the liquid flow channel extends to the surface of the valve body, n valve bodies are provided, n-1 guide pipes are provided, the end cover is one, n is more than or equal to 2, one end of the guide pipe is used for being inserted into the second end of the liquid flow channel on one valve body and is in sealing connection with the second end of the liquid flow channel on the other valve body, the other end of the guide pipe is in threaded connection with the first end of the liquid flow channel on the other valve body, two adjacent valve bodies are locked through fasteners, and the end cover is used for sealing the second end of the liquid flow channel of one valve body positioned at the end;
the valve body comprises a left panel, a cross block and a right panel, the left panel and the right panel are respectively and integrally connected with two ends of the cross block, a first end of the liquid flow channel is positioned on the left panel, a second end of the liquid flow channel is positioned on the right panel, and the liquid flow channel is coaxial with the cross block;
the cross block is provided with four rib plates extending longitudinally, the second end of the half through hole is positioned on the side surface of the rib plate, which is far away from the axis of the cross block, and the axis of the half through hole is perpendicular to the axis of the cross block;
the pressure switching module for calibrating the optical fiber pressure sensor further comprises a cylindrical plug, the shape of the cylindrical plug is consistent with that of a pressure sensing element of the cylindrical sealed optical fiber pressure sensor, a sealing ring is arranged in an annular groove on the cylindrical surface of the cylindrical plug, and the cylindrical plug is fixed in one sealing barrel through one pressing block and one threaded sleeve.
2. The pressure transfer module for fiber optic pressure sensor calibration according to claim 1, wherein there are six half-through holes, each two of the half-through holes being located in one of the ribs.
3. The pressure transfer module for fiber optic pressure sensor calibration according to claim 1, wherein said end cap has a cylindrical protrusion thereon for insertion into and sealing connection with a second end of said fluid flow passage of one of said valve bodies at an end.
4. The pressure switching module for calibrating the optical fiber pressure sensor according to claim 1, wherein annular grooves are formed in two end faces of the connector, the right end face of the valve body and a plane on the sealing cylinder, which is used for abutting against the valve body, and sealing rings are arranged in the annular grooves.
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| WO2018086553A1 (en) * | 2016-11-09 | 2018-05-17 | 杭州三花研究院有限公司 | Fluid heat exchange assembly, and heat management system of vehicle |
| CN109470558A (en) * | 2018-12-19 | 2019-03-15 | 中国科学院地球化学研究所 | A kind of calibration device for displacement sensor under high temperature and pressure |
| CN209745472U (en) * | 2019-05-24 | 2019-12-06 | 国家海洋技术中心 | Pressure switching module for calibrating optical fiber pressure sensor |
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| US20050200943A1 (en) * | 2004-03-12 | 2005-09-15 | Devincentis David S. | Thermal management of an optical amplifier module housed in a universal cable joint |
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|---|---|---|---|---|
| WO2018086553A1 (en) * | 2016-11-09 | 2018-05-17 | 杭州三花研究院有限公司 | Fluid heat exchange assembly, and heat management system of vehicle |
| CN109470558A (en) * | 2018-12-19 | 2019-03-15 | 中国科学院地球化学研究所 | A kind of calibration device for displacement sensor under high temperature and pressure |
| CN209745472U (en) * | 2019-05-24 | 2019-12-06 | 国家海洋技术中心 | Pressure switching module for calibrating optical fiber pressure sensor |
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