CN117538566A - Flow direction calibration experimental device and method for towing inclined type current meter - Google Patents
Flow direction calibration experimental device and method for towing inclined type current meter Download PDFInfo
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- CN117538566A CN117538566A CN202410030100.2A CN202410030100A CN117538566A CN 117538566 A CN117538566 A CN 117538566A CN 202410030100 A CN202410030100 A CN 202410030100A CN 117538566 A CN117538566 A CN 117538566A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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- Measuring Volume Flow (AREA)
Abstract
The application provides a flow direction calibration experimental device and a flow direction calibration experimental method of a towing inclined type current meter, comprising the following steps: the bottom of the supporting base body is provided with a connecting part which is used for being connected with the tail end of the current meter; the scale ring can be arranged on the top of the supporting base body in a universal rotation mode around the central shaft of the connecting part, a circle of first angle scales which are arranged around the central shaft of the connecting part are arranged on the scale ring, and the angle range of the first angle scales is 0-360 degrees; the locking structure is arranged between the supporting base body and the scale ring and is used for fixing the scale ring on the supporting base body; the rotating ring can be arranged on the supporting base body in a universal rotation mode around the central shaft of the connecting part, and an indicating part is arranged on the rotating ring and used for indicating each scale value on the first angle scale; and the clamp is arranged on the swivel and is used for clamping the current meter in a manner of inclining the current meter by an angle relative to the vertical direction. Which enables flow direction calibration of the magnetometer of the current meter.
Description
Technical Field
The present disclosure relates to flow direction calibration experiment devices, and more particularly to a flow direction calibration experiment device and method for a drag-tilt current meter.
Background
Ocean currents are important marine hydrologic factors, and ocean current measurement is an important content of ocean natural resource investigation, and long-term change rules of ocean currents are required to be mastered in ocean resource development activities such as oil gas development, port construction, marine transportation, submarine mineral development, ocean fishing, aquaculture and the like. Thus, the accuracy of the current data measured by the current measuring instrument directly affects the quality of the marine survey activity.
The dragging inclined type ocean current meter is one of a plurality of ocean current measuring instruments, is a novel self-contained ocean current measuring instrument, is internally provided with an accelerometer and a magnetometer, records an inclination angle by using the accelerometer and an inclination direction by using the magnetometer, converts the inclination angle into a current ocean current velocity by data processing and converts the inclination direction into the current ocean current direction, and has the characteristics of easy arrangement, small volume, low price, small disturbance, low noise and the like, is convenient for being simultaneously arranged at a large number of observation points, and acquires short-term or long-term continuous ocean bottom flow field data, thereby obtaining ocean current change rules of ocean bottom single points or segmented ocean areas. The novel current meter breaks through the limitations of the traditional current meters such as mechanical principle current meters, acoustic principle current meters and the like on large environmental disturbance, high price, incapability of large-scale arrangement, incapability of continuous measurement of underflow for a long time and the like, has important significance for acquiring underflow field data required by coral reef investigation and benthos investigation, and has important significance for development of China in the fields of ocean resource investigation, environmental monitoring, physical ocean research and the like.
However, the current towing inclined current meter can only roughly judge the accuracy of the measurement result by comparing with the propeller current meter in a bay with a stable flow field, and the current flow value can not be traced to the national or international measurement standard step by step through an uninterrupted comparison and calibration chain, so that the reliability of the obtained measurement value can not be ensured.
Disclosure of Invention
The embodiment of the application provides a flow direction calibration experimental device and a flow direction calibration experimental method for a towing inclined type current meter, so as to solve the problems in the related art, and the technical scheme is as follows:
in a first aspect, embodiments of the present application provide a flow direction calibration experiment device of a drag-tilting current meter, including:
the bottom of the supporting base body is provided with a connecting part capable of universally rotating, and the connecting part is used for being connected with the tail end of the current meter;
the scale ring can be arranged on the top of the supporting base body in a universal rotation mode around the central shaft of the connecting part, a circle of first angle scales which are arranged around the central shaft of the connecting part are arranged on the scale ring, and the angle range of the first angle scales is 0-360 degrees;
the locking structure is arranged between the supporting base body and the scale ring and is used for fixing the scale ring on the supporting base body;
the rotating ring can be arranged on the supporting base body in a universal rotation mode around the central shaft of the connecting part, and an indicating part is arranged on the rotating ring and used for indicating each scale value on the first angle scale; and
and the clamp is arranged on the swivel and is used for clamping the current meter in a manner of inclining the current meter by an angle relative to the vertical direction.
In one embodiment, the clamp comprises:
the connecting seat is arranged on the swivel;
the supporting seat can be movably arranged on the connecting seat so that the inclination angle of the supporting seat relative to the vertical direction is adjustable, a first limit groove is arranged on the supporting seat, the first limit groove is vertically communicated, and the first limit groove is used for being matched with a current meter; and
the fastening piece is in threaded connection on the supporting seat, and the end portion of the fastening piece can stretch into the first limiting groove and prop against the current meter, so that the current meter is fixed on the supporting seat.
In one embodiment, the head of the fastener is located outside the connection seat, the head of the fastener abuts against the outside of the connection seat, and the rod of the fastener passes through the connection seat to be in threaded connection with the support seat.
In one embodiment, the number of the fasteners is two, one of the fasteners is provided on one of the opposite sides of the support base, and the other fastener is provided on the other of the opposite sides of the support base.
In one embodiment, the two opposite sides of the connecting seat are respectively provided with an angle adjusting groove and second angle scales, the angle adjusting grooves are arc-shaped, each angle adjusting groove is used for allowing the corresponding rod part of the fastener to pass through, and each second angle scale is distributed along the length extending direction of the corresponding angle adjusting groove.
In one embodiment, the first limiting groove is provided with a side opening communicated with the first limiting groove, the side opening faces to the central shaft of the connecting part, and the side opening is used for enabling the shell of the current meter to enter and exit the first limiting groove.
In one embodiment, the groove width of the first limiting groove is smaller than that of the head end cover of the current meter, and the top of the connecting seat is used for being propped against the head end cover of the current meter.
In one embodiment, the support base is provided with a support ring, the support ring and the support base are separately arranged, the scale ring and the swivel are both rotatably arranged on the support ring, and the locking structure is arranged between the support ring and the scale ring.
In one embodiment, an annular positioning groove is formed in one side, close to the central shaft of the connecting part, of the top of the supporting ring, and the scale ring is rotatably arranged on the annular positioning groove;
the support ring is also provided with a second limit groove and a turntable bearing, the second limit groove is annular, and the turntable bearing is positioned in the second limit groove;
the swivel comprises a first annular part and a second annular part which are arranged one by one from outside to inside, the first annular part is inserted into the second limiting groove, the first annular part is connected with the turntable bearing, so that the swivel can rotate, the second annular part is positioned on a central hole of the supporting ring, the second annular part is close to the inner side of the supporting ring, and the indicating part is arranged at the top of the second annular part.
In one embodiment, the supporting substrate is provided with an inner cavity and a water inlet and outlet structure, the connecting part is positioned at the bottom center of the inner cavity, the clamp is positioned in the inner cavity, the water inlet and outlet structure is arranged outside the bottom of the supporting substrate, and the water inlet and outlet structure is communicated with the inner cavity.
In a second aspect, an embodiment of the present application provides a flow direction calibration experiment method for a drag-tilting current meter, where the flow direction calibration experiment device for the drag-tilting current meter is used for calibrating the flow direction of the drag-tilting current meter, and the flow direction calibration method includes the following steps:
the geographic north direction was introduced into an indoor nonmagnetic laboratory: the method comprises the steps that the placement position of a flow direction calibration experimental device of a towing inclined type current meter in a nonmagnetic laboratory is set as a point C, two points A, B which are not in a straight line with the point C are found in an outdoor open environment, and the geographic north pole direction of the point C is determined according to the coordinates of the point A and the point B;
positioning: placing a flow direction calibration experimental device of the towing inclined type current meter at the position of the point C, enabling a 0 degree indication value of a first angle scale of the scale ring to point to the geographic north pole direction, and fixing the scale ring on a supporting substrate by using a locking structure;
and (3) calibrating: and fixing the head end of the towing inclined current meter on the clamp, connecting the tail end with the connecting part, starting the towing inclined current meter, rotating the swivel to enable the head end of the towing inclined current meter to be aligned with the 0 degree indication value of the first angle scale of the scale ring, recording more than 6 continuous indication value readings after the towing inclined current meter is stabilized, rotating the swivel clockwise for 30 degrees to enable the head end of the towing inclined current meter to be aligned with the 30 degree indication value of the first angle scale of the scale ring, calibrating 30 degrees points, one calibration point every 30 degrees, and calibrating according to the calibration steps.
The advantages or beneficial effects in the technical scheme at least comprise:
the flow direction calibration experiment device of the invention integrates a supporting base body, a scale ring, a locking structure, a swivel and a clamp, utilizes the scale ring as a flow direction calibration standard of the current meter, simultaneously enables the scale ring to be capable of universally rotating around a central shaft of a connecting part, enables the scale ring to be capable of adjusting circumferential positions and be reliably locked on the supporting base body by the locking structure after the positions are adjusted, enables a 0 degree scale on the scale ring to always point to the direction of a geographic north pole and enables a 180 degree scale to always point to the direction of a geographic south pole, thereby ensuring flow direction calibration accuracy of the current meter, and ensures that the current meter can freely rotate like in sea by clamping the current meter on the clamp and connecting the tail end of the current meter through the connecting rope and the connecting part during calibration, the current calibration direction and the current flow direction are compared through controlling the controller, if errors exist in the current calibration direction and the current flow direction, the current flow direction is calibrated, the steps are repeated for a plurality of times, so that the flow direction calibration accuracy of the current meter is improved, the flow direction calibration experimental device is simple and practical in structure, low in cost and easy to operate, and popularization and application of the flow direction calibration experimental device are facilitated.
The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.
Drawings
In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.
FIG. 1 is a schematic diagram of a flow direction calibration experiment device of a drag tilt current meter according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a partial enlarged view at B in FIG. 1;
FIG. 4 is an exploded view of a flow direction calibration experiment device of a drag tilt meter of the present invention;
fig. 5 is a schematic structural view of a fixture in a flow direction calibration experiment device of a drag tilt current meter according to the present invention.
Reference numerals
10. A support base; 11. a connection part; 12. an inner cavity; 13. a water inlet and outlet structure; 20. a scale ring; 21. a first angle scale; 30. a swivel; 31. a first annular portion; 32. a second annular portion; 321. an instruction unit; 40. a clamp; 41. a connecting seat; 411. an angle adjusting groove; 412. a second angle scale; 42. a support base; 421. a first limit groove; 43. a fastener; 50. a support ring; 51. a positioning groove; 60. a turntable bearing.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
1-5, a flow direction calibration experiment device of a drag tilt current meter according to a preferred embodiment of the present invention is shown, comprising:
the support base body 10, the bottom of the support base body 10 is provided with a connecting part 11 capable of universally rotating, and the connecting part 11 is used for connecting with the tail end of a current meter;
the scale ring 20 is arranged on the top of the supporting base body 10 in a universal rotation mode around the central axis of the connecting part 11, a circle of first angle scales 21 which are arranged around the central axis of the connecting part 11 are arranged on the scale ring 20, the angle range of the first angle scales 21 is 0-360 degrees, so that the scale ring 20 can adjust the circumferential position, the 0-degree scale on the scale ring 20 always points to the geographic north pole direction and the 180-degree scale always points to the geographic south pole direction, and the calibration accuracy is ensured;
the locking structure is arranged between the supporting base body 10 and the scale ring 20, and is used for fixing the scale ring 20 on the supporting base body 10, namely, the locking structure is used for fixing the scale ring 20 after the position is adjusted, so that the calibration accuracy is prevented from being influenced by rotation of the scale ring 20;
the swivel 30 is arranged on the supporting base body 10 in a universal rotation mode around the central axis of the connecting part 11, the swivel 30 is provided with an indicating part 321, the indicating part 321 is used for indicating each scale value on the first angle scale 21, the clamp 40 can be driven to rotate by rotating the swivel 30, and the clamp 40 rotates to enable the current meter to rotate so as to enable the current meter to face a designated calibration direction, and therefore the current meter can be calibrated in the flow direction in the designated calibration direction conveniently; and
the clamp 40 is arranged on the swivel 30, and the clamp 40 is used for clamping the current meter in a mode of inclining the current meter by an angle relative to the vertical direction, so that the current meter forms an inclination angle, and the working state of the current meter when a certain flow rate exists is simulated.
According to the flow direction calibration experiment device, as the supporting base body 10, the scale ring 20, the locking structure, the rotating ring 30 and the clamp 40 are integrated, the scale ring 20 is used as a flow direction calibration standard of the current meter, meanwhile, the scale ring 20 can be enabled to be capable of being universally rotated around the central axis of the connecting part 11, so that the scale ring 20 can be adjusted in circumferential position and can be reliably locked on the supporting base body 10 by the locking structure after the position is adjusted, the 0 degree scale on the scale ring 20 always points to the geographic north pole and the 180 degree scale always points to the geographic south pole, the flow direction calibration accuracy of the current meter is ensured, the current meter is ensured to be capable of freely rotating like the current meter in the ocean by clamping the current meter on the clamp 40 and connecting the tail end of the current meter through the connecting rope and the connecting part 11 during the calibration experiment, the clamp 40 can be driven to rotate by stirring the swivel 30, the clamp 40 rotates to enable the current meter to rotate so as to enable the current meter to face the appointed calibration direction, so that the magnetometer on the current meter can obtain the flow direction value in the appointed calibration direction, then the current meter is taken down and is connected to a controller with a built-in calibration program through a data line, the current appointed calibration direction and the current flow direction are compared through controlling the controller, if errors exist between the current appointed calibration direction and the current flow direction, the current flow direction is calibrated, the steps are repeated for a plurality of times, the flow direction calibration accuracy of the current meter is improved, the flow direction measurement accuracy of the current meter is improved, the flow direction calibration experimental device is simple and practical in structure, low in cost and easy to operate, and popularization and application of the flow direction calibration experimental device are facilitated.
Specifically, in order to improve the flow direction calibration accuracy of the current meter, during the calibration experiment, calibration is sequentially performed at intervals of 30 degrees by using the steps, each calibration point is repeatedly calibrated for 6 times, the flow direction calibration requires to be calibrated for one circle (0-360 degrees) clockwise and anticlockwise, the reading of the flow direction standard value is accurate to 0.1 degrees, and the current meter indication value is recorded to 1 degree.
Referring to fig. 1, 4 and 5, in one embodiment, the clamp 40 includes:
the connecting seat 41, the connecting seat 41 is arranged on the swivel 30;
the supporting seat 42, the supporting seat 42 can be movably arranged on the connecting seat 41, so that the inclination angle of the supporting seat 42 relative to the vertical direction is adjustable, the inclination angle of the current meter relative to the vertical direction is adjustable, the supporting seat 42 is provided with a first limit groove 421, the first limit groove 421 is penetrated up and down, and the first limit groove 421 is used for being matched with the current meter; and
the fastening piece 43 is screwed on the supporting seat 42, and the end part of the fastening piece 43 can extend into the first limiting groove 421 and prop against the current meter to fix the current meter on the supporting seat 42. That is, the inclination angle of the current meter relative to the vertical direction is adjusted by moving the supporting seat 42 so as to simulate the working state of the current meter under different flow rates, so that the current meter has different flow rates, the current meter can be conveniently calibrated under different flow rates, the current meter flow direction calibration accuracy can be further improved, the current meter can be fixed by tightening the fastening piece 43, the current meter can be loosened by loosening the fastening piece 43, the operation is convenient, the fixture 40 is simple and practical in structure, low in cost and easy to install.
Referring to fig. 1, 4 and 5, in one embodiment, the head of the fastener 43 is located outside the connection seat 41, the head of the fastener 43 abuts against the outside of the connection seat 41, and the rod of the fastener 43 passes through the connection seat 41 to be screwed with the support seat 42. Thus, the connection between the connecting seat 41 and the supporting seat 42 can be realized through the fastening piece 43, so that the connecting seat 41 can be reliably installed on the supporting seat 42, the fastening piece 43 has a dual-purpose structure, the structure of the clamp 40 can be further simplified, and the cost reduction is facilitated. Of course, in other embodiments, the connection seat 41 may be connected to the support seat 42 by other structures.
Referring to fig. 1, 4 and 5, in one embodiment, the number of the fastening members 43 is two, one fastening member 43 is provided at one of opposite sides of the support base 42, and the other fastening member 43 is provided at the other of opposite sides of the support base 42, so as to improve connection reliability of both the connection base 41 and the support base 42.
In order to facilitate easy adjustment and determination of the inclination angle (i.e. the flow rate) of the current meter, in one embodiment, the opposite sides of the connection seat 41 are provided with angle adjustment slots 411 and second angle scales 412, the angle adjustment slots 411 are arc-shaped, each angle adjustment slot 411 is used for passing through the rod portion of the corresponding fastener 43, and each second angle scale 412 is arranged along the length extending direction of the corresponding angle adjustment slot 411. Thus, the inclination angle of the current meter can be adjusted by unscrewing the fastening member 43 and moving the rod portion of the fastening member 43 along the length extension direction of the angle adjusting slot 411, and the operation is simple and convenient.
Referring to fig. 1, 4 and 5, in one embodiment, the first limiting groove 421 is provided with a side opening in communication with the first limiting groove, the side opening faces the central axis of the connecting portion 11, and the side opening is used for allowing the housing of the current meter to enter and exit the first limiting groove 421, so as to facilitate the clamping and the dismounting of the current meter.
In one embodiment, the groove width of the first limiting groove 421 is smaller than that of the head end cover of the current meter, and the top of the connecting seat 41 is used for propping against the head end cover of the current meter to limit the downward movement of the current meter, so that the clamping reliability of the current meter can be improved. That is, by abutting the head end cover of the current meter against the top of the connecting seat 41, the housing part of the current meter is placed in the first limiting groove 421, and the rod end of the fastener 43 is abutted against the housing part of the current meter in the first limiting groove 421, so that the clamping of the current frame can be realized, and the clamping reliability is high.
Referring to fig. 1 and fig. 4, in an embodiment, a support ring 50 is disposed on a support base 10, the support ring 50 and the support base 10 are separately disposed, both a scale ring 20 and a swivel 30 can be rotatably disposed on the support ring 50, and a locking structure is disposed between the support ring 50 and the scale ring 20, so that the support ring 50, the scale ring 20 and the swivel 30 can be assembled to form a modularized structure, so that the support ring 50, the scale ring 20 and the swivel 30 are assembled together and then mounted on the support base 10, with low mounting difficulty and more convenient mounting.
Specifically, referring to fig. 4, in one embodiment, an annular positioning groove 51 is formed on a side of the top of the support ring 50 near the central axis of the connection part 11, and the scale ring 20 is rotatably disposed on the annular positioning groove 51, so that the scale ring 20 is positioned, and thus the scale ring 20 is rotated.
Specifically, in one embodiment, the locking structure includes a connection hole, an adjusting hole, a bolt and a nut, where the connection hole is vertically and penetratingly disposed on the scale ring 20, the adjusting hole is vertically and penetratingly disposed on the support ring 50, the adjusting hole extends along a circumferential direction of the support ring 50 (that is, the adjusting hole is an arc slot with a center overlapping with a center of the support ring 50), a head of the bolt abuts against a top of the scale ring 20, a rod of the bolt sequentially passes through the connection hole and the adjusting hole to extend below a bottom of the support ring 50, the nut is screwed onto the rod of the bolt, the nut abuts against a bottom of the support ring 50, and thus, by unscrewing the nut, the scale ring 20 is then stirred, the rod of the bolt can move along a length extending direction of the adjusting slot, so that a circumferential position of the scale ring 20 is adjustable.
Of course, in other embodiments, the locking structure may specifically include a bolt, the bolt is screwed on the supporting ring 50, the bolt is arranged above the scale ring 20 along the vertical direction, and the bottom of the bolt can abut against the top of the scale ring 20, so that the scale ring 20 can be reliably locked on the supporting ring 50.
Specifically, the support ring 50 is further provided with a second limiting groove and a turntable bearing 60, the second limiting groove is annular, and the turntable bearing 60 is located in the second limiting groove; the swivel 30 includes a first annular portion 31 and a second annular portion 32 that are disposed one by one from outside to inside, the first annular portion 31 is inserted into the second limiting groove, the first annular portion 31 is connected with the turntable bearing 60, so that the swivel 30 can rotate, the second annular portion 32 is located on a central hole of the supporting ring 50, the second annular portion 32 is close to an inner side of the supporting ring 50, and the indication portion 321 is disposed on top of the second annular portion 32. In this way, the first annular portion 31 is limited up and down through the second limiting groove, so that the rotary ring 30 is supported, the rotary ring 30 is reliably installed on the supporting ring 50, meanwhile, the rotary ring 30 can rotate relative to the supporting ring 50 by utilizing the turntable bearing 60, the structure is simple and practical, the cost is low, in addition, the second annular portion 32 is close to the inner side of the supporting ring 50, so that the indicating portion 321 is located on the inner side of the supporting ring 50, the indicating portion 321 is closer to the scale ring 20, the standard scale is set in a manner that the indicating portion 321 points to more conveniently and visually, the flow direction calibration experiment of the current meter is more convenient, and the efficiency is improved.
Specifically, the support ring 50, the scale ring 20, the swivel 30, the jig 40, the support base 10, and the like may be made of transparent materials.
Referring to fig. 1 and 3, in one embodiment, the supporting base 10 is provided with an inner cavity 12 and a water inlet and outlet structure 13, the connecting portion 11 is located at the bottom center of the inner cavity 12, the clamp 40 is located in the inner cavity 12, the water inlet and outlet structure 13 is located outside the bottom of the supporting base 10, and the water inlet and outlet structure 13 is communicated with the inner cavity 12. That is, the supporting base 10 is a container capable of containing water, so that the tightness of the current meter can be conveniently detected.
In a second aspect, a preferred embodiment of the present invention provides a flow direction calibration test method for a drag-tilting current meter, which is implemented by using the flow direction calibration test device for a drag-tilting current meter, and includes the following steps:
the geographic north direction (true north direction) was introduced into an indoor nonmagnetic laboratory: in order to ensure the accuracy and stability of the flow direction indication value of the drag-tilting current meter, the flow direction calibration experimental device of the drag-tilting current meter is placed in an indoor nonmagnetic laboratory to be unfolded and measured so as to avoid the influence of the surrounding magnetic environment on the magnetometer work of the drag-tilting current meter, the placement position of the flow direction calibration experimental device of the drag-tilting current meter in the nonmagnetic laboratory is point C, two points A, B which are not in line with the point C are found in an outdoor open environment, and the geographic north pole direction of the point C is determined according to the coordinates of the point A and the point B, wherein the geographic north pole direction of the point C is specifically determined as follows:
measuring the coordinates of a point A and a point B by using a positioning device, measuring the distances from a point C to the point A and the point B and the distances from the point A to the point B by using a distance measuring device, so as to obtain the coordinates of the point C, and obtaining the coordinate azimuth angle of a straight line connected with the point C and the point A according to the coordinates of the point C and the coordinates of the point A, so as to obtain the geographic north pole direction of the position of the point C;
positioning: placing the flow direction calibration test device of the drag-tilting current meter at the position of the point C, enabling the 0 degree indication value of the first angle scale 21 of the scale ring 20 to point to the geographic north pole direction, and fixing the scale ring 20 on the supporting base body 10 by using a locking structure, wherein when the flow direction calibration test device of the drag-tilting current meter is used fixedly, the scale ring 20 and the supporting base body 10 should not move, and verifying the geographic north pole direction pointed by the 0 degree in the first angle scale 21 of the scale ring 20 according to the steps every year;
and (3) calibrating: the head end of the drag-tilting current meter is fixed to the clamp 40, wherein the relation between the flow rate and the inclination angle given by the drag-tilting current meter specification can be contrasted, the drag-tilting current meter is adjusted to be inclined at an angle relative to the vertical direction by using the angle adjusting slot 411 of the clamp 40, so as to simulate a certain flow rate, then the tail end of the drag-tilting current meter is connected with the connecting part 11, the drag-tilting current meter is ensured not to shake and can rotate along with the swivel 30, the drag-tilting current meter is started, then the swivel 30 is rotated, the head end of the drag-tilting current meter is aligned with the 0 degree indication value of the first angle indication 21 of the scale ring 20, after the drag-tilting current meter is stabilized, the record of more than 6 indication value readings is carried out, then the swivel 30 is rotated clockwise, the head end of the drag-tilting current meter is aligned with the 30 degree indication value of the first angle indication 21 of the scale ring 20, the calibration of 30 degree is carried out every 30 degree calibration point, and the calibration is carried out according to the calibration steps. The flow direction calibration requires clockwise (forward rotation) and anticlockwise (reverse rotation) for one circle (0-360 degrees), the reading of the flow direction standard value is recorded to 0.1 degrees, and the dragging inclined ocean current meter value is recorded to 1 degree.
The angle adjustment slot 411 of the clamp 40 is used to adjust the drag-tilt-type current meter to different angles inclined relative to the vertical direction, so that the error of the flow direction indication of the drag-tilt-type current meter at different flow rates can be obtained.
According to the use and working range of the drag tilting type current meter, a user can compare the obtained flow direction indication value error with the use requirement so as to verify the accuracy of the drag tilting type current meter.
It will be appreciated that magnitude traceability, also known as calibration experiments, is a process whereby the value of a measurement result or measurement standard is linked to a defined reference standard (typically a national or international metrology standard) by an uninterrupted comparison chain with defined uncertainties.
The magnitude tracing method of the drag-inclined current meter, also called a calibration experiment method, is a method for determining an indication error by taking a flow direction calibration experiment device of the drag-inclined current meter as a reference standard and comparing a flow direction indication value measured by the drag-inclined current meter with an angle indication value given by the flow direction calibration experiment device of the drag-inclined current meter.
The flow direction calibration experimental device and method for the towing inclined type current meter have the following advantages:
1. the magnitude traceability problem of the towing inclined type current meter is solved:
at present, the towing inclined type current meter can only roughly judge the accuracy of a measurement result by comparing the towing inclined type current meter with a mechanical current meter in a bay with a relatively stable flow field, and can not effectively trace the source to a national measurement standard through a calibration chain, so that the reliability of the obtained magnitude can not be ensured. The invention fills the blank in the aspect of guaranteeing the towing inclined ocean current metering value, has important significance on the accuracy of the ocean current value, and has wide market prospect in the aspects of ocean resource investigation and the like.
2. Breaks through the current situation of tracing the current value of the directional measurement in the ocean current field:
conventionally, for measuring equipment in the marine field with a direction indication function, such as a direct-reading type current meter, an acoustic current single-point measuring instrument, a ship weather meter, a portable three-cup wind direction anemometer and the like, or only a method for tracing the accuracy of an angle indicator (such as a dial and the like) thereof, only the rotated relative angle value is focused, but not the accuracy of the indicated direction; or trace to the magnetic north direction, however, the magnetic north direction of the earth changes with time, and the geomagnetic declination of different places is different, so that the direction magnitude cannot be stably transmitted. The invention patent with publication number CN106526236A discloses a method and a device for calibrating the flow direction of a current meter, which uses a compass as a standard device and also traces the flow direction to the geomagnetic north direction.
The magnitude tracing method of the invention relates to a north finding system, which traces the magnitude of the flow measured by a drag inclined current meter to the geographic north pole direction which does not change with time. The magnitude tracing method of the invention adopts the distance measuring equipment and the positioning equipment which are normally prepared by the ocean system as the standard device, and is more reasonable, economical and practical compared with the standard device which adopts the gyroscopic theodolite, the optical compass and other equipment as the geographic north pole direction. The magnitude transmission device provided by the invention is provided with the scale ring 20, can be adjusted along with the place conversion, enables 0 degree to point to the geographic north pole direction, and is fixed by using a locking structure, so that the problem of tracing the magnitude of the directional measurement in the ocean field for a long time is solved.
3. The function of calibrating the flow direction at different ocean current flow rates is realized:
the flow direction calibration experimental device of the drag-inclined current meter is provided with the clamp 40 with the angle adjusting slot 411, so that the drag-inclined current meter can be adjusted to different angles inclined relative to the vertical direction, the record states of the drag-inclined current meter are simulated when different flow speeds are achieved, the tracing of the flow direction values of the drag-inclined current meter in different flow speed states is realized, a user of the drag-inclined current meter can obtain the flow direction indication errors of the drag-inclined current meter when different flow speeds are obtained according to the use and the working range of the drag-inclined current meter, and the use performance of the drag-inclined current meter is mastered more comprehensively and flexibly.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A flow direction calibration experiment device of a drag tilt current meter, comprising:
the bottom of the supporting base body is provided with a connecting part capable of universally rotating, and the connecting part is used for being connected with the tail end of the current meter;
the scale ring can be arranged on the top of the supporting base body in a universal rotation mode around the central shaft of the connecting part, a circle of first angle scales which are arranged around the central shaft of the connecting part are arranged on the scale ring, and the angle range of the first angle scales is 0-360 degrees;
the locking structure is arranged between the supporting base body and the scale ring and is used for fixing the scale ring on the supporting base body;
the rotating ring can be arranged on the supporting base body in a universal rotation mode around the central shaft of the connecting part, and an indicating part is arranged on the rotating ring and used for indicating each scale value on the first angle scale; and
and the clamp is arranged on the swivel and is used for clamping the current meter in a manner of inclining the current meter by an angle relative to the vertical direction.
2. The flow direction calibration experiment device of a drag tilt current meter according to claim 1, wherein the fixture comprises:
the connecting seat is arranged on the swivel;
the supporting seat can be movably arranged on the connecting seat so that the inclination angle of the supporting seat relative to the vertical direction is adjustable, a first limit groove is arranged on the supporting seat, the first limit groove is vertically communicated, and the first limit groove is used for being matched with a current meter; and
the fastening piece is in threaded connection on the supporting seat, and the end portion of the fastening piece can stretch into the first limiting groove and prop against the current meter, so that the current meter is fixed on the supporting seat.
3. The flow direction calibration experiment device of a drag tilt current meter according to claim 2, wherein the head of the fastener is located outside the connection base, the head of the fastener is abutted against the outside of the connection base, and the stem of the fastener passes through the connection base to be screwed with the support base.
4. A flow direction calibration experiment apparatus for a drag tilt current meter according to claim 3, wherein the number of said fasteners is two, one of said fasteners being provided on one of opposite sides of said support base and the other of said fasteners being provided on the other of opposite sides of said support base.
5. The flow direction calibration experiment device of a towing inclined type current meter according to claim 4, wherein the two opposite sides of the connecting seat are respectively provided with an angle adjusting groove and second angle scales, the angle adjusting grooves are arc-shaped, each angle adjusting groove is used for allowing the corresponding rod part of the fastener to pass through, and each second angle scale is distributed along the length extending direction of the corresponding angle adjusting groove.
6. The flow direction calibration experiment device of the towing inclined type current meter according to claim 2, wherein a side opening communicated with the first limiting groove is arranged on the first limiting groove, the side opening faces to the central axis of the connecting portion, and the side opening is used for enabling the housing of the current meter to enter and exit the first limiting groove.
7. The flow direction calibration experiment device of the towing inclined type current meter according to claim 6, wherein the groove width of the first limiting groove is smaller than that of the head end cover of the current meter, and the top of the connecting seat is used for being abutted against the head end cover of the current meter.
8. The flow direction calibration experiment device of a towing inclined type current meter according to claim 1, wherein a supporting ring is arranged on the supporting base body, the supporting ring and the supporting base body are arranged in a split mode, the scale ring and the rotating ring are both rotatably arranged on the supporting ring, and the locking structure is arranged between the supporting ring and the scale ring.
9. The flow direction calibration experiment device of the towing inclined type current meter according to claim 8, wherein an annular positioning groove is arranged on one side of the top of the supporting ring, which is close to the central axis of the connecting part, and the scale ring can be rotatably arranged on the annular positioning groove;
the support ring is also provided with a second limit groove and a turntable bearing, the second limit groove is annular, and the turntable bearing is positioned in the second limit groove;
the swivel comprises a first annular part and a second annular part which are arranged one by one from outside to inside, the first annular part is inserted into the second limiting groove, the first annular part is connected with the turntable bearing, so that the swivel can rotate, the second annular part is positioned on a central hole of the supporting ring, the second annular part is close to the inner side of the supporting ring, and the indicating part is arranged at the top of the second annular part.
10. A flow direction calibration experiment method of a drag-tilting current meter, characterized in that the flow direction calibration experiment device of the drag-tilting current meter according to any one of claims 1-9 is used for calibrating the flow direction of the drag-tilting current meter, comprising the following steps:
the geographic north direction was introduced into an indoor nonmagnetic laboratory: the method comprises the steps that the placement position of a flow direction calibration experimental device of a towing inclined type current meter in a nonmagnetic laboratory is set as a point C, two points A, B which are not in a straight line with the point C are found in an outdoor open environment, and the geographic north pole direction of the point C is determined according to the coordinates of the point A and the point B;
positioning: placing a flow direction calibration experimental device of the towing inclined type current meter at the position of the point C, enabling a 0 degree indication value of a first angle scale of the scale ring to point to the geographic north pole direction, and fixing the scale ring on a supporting substrate by using a locking structure;
and (3) calibrating: and fixing the head end of the towing inclined current meter on the clamp, connecting the tail end with the connecting part, starting the towing inclined current meter, rotating the swivel to enable the head end of the towing inclined current meter to be aligned with the 0 degree indication value of the first angle scale of the scale ring, recording more than 6 continuous indication value readings after the towing inclined current meter is stabilized, rotating the swivel clockwise for 30 degrees to enable the head end of the towing inclined current meter to be aligned with the 30 degree indication value of the first angle scale of the scale ring, calibrating 30 degrees points, one calibration point every 30 degrees, and calibrating according to the calibration steps.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204719071U (en) * | 2015-06-09 | 2015-10-21 | 重庆华正水文仪器有限公司 | Flow rate and direction instrument calibrating installation |
| CN106526236A (en) * | 2016-10-31 | 2017-03-22 | 河北科技大学 | Method and device for calibrating current meter flow direction |
| CN209673154U (en) * | 2019-04-24 | 2019-11-22 | 水利部南京水利水文自动化研究所 | A kind of current measuring instrument flows to performance detector |
| CN115508579A (en) * | 2022-09-13 | 2022-12-23 | 山东省科学院海洋仪器仪表研究所 | Seawater profile flow velocity and flow direction observation method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204719071U (en) * | 2015-06-09 | 2015-10-21 | 重庆华正水文仪器有限公司 | Flow rate and direction instrument calibrating installation |
| CN106526236A (en) * | 2016-10-31 | 2017-03-22 | 河北科技大学 | Method and device for calibrating current meter flow direction |
| CN209673154U (en) * | 2019-04-24 | 2019-11-22 | 水利部南京水利水文自动化研究所 | A kind of current measuring instrument flows to performance detector |
| CN115508579A (en) * | 2022-09-13 | 2022-12-23 | 山东省科学院海洋仪器仪表研究所 | Seawater profile flow velocity and flow direction observation method |
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