Fiber grating pressure ring

Abstract

The utility model relates to the technical field of pressure detection devices, in particular to a fiber bragg grating pressure ring which comprises a fiber bragg grating sensor, a stress column and a shell assembly, the shell assembly comprises an outer side protective shell and an inner side protective shell, one side of the fiber bragg grating sensor is provided with the stress column, and the stress column is made of elastic metal and is in a thin-wall design. Movable rings are arranged at the upper end and the lower end of the stress column, inner side protective shells are arranged on the inner sides of the movable rings, outer side protective shells are arranged on the outer sides of the movable rings, the movable rings are slidably connected with the outer side protective shells and the inner side protective shells, the outer side protective shells and the inner side protective shells are of hollow design, and the outer side protective shells and the inner side protective shells are filled with heat insulation layers; the heat insulation layer is made of heat insulation materials; the heat insulation structure is arranged on the outer side of the stressed deformation part, pressure detection errors caused by overlarge temperature change are prevented, meanwhile, the deformation part is independently arranged, and the deformation part can adopt the design which is easier to deform, so that the sensitivity is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure detection device technical field especially relates to a kind of fiber grating pressure ring. BACKGROUND

[0002] Fiber grating pressure ring is a kind of sensor for measuring pressure, mainly for the measurement of anchor cable, anchor rod, suspender, stay cable, anchor bolt internal force and other heavy load and prestress loss situation, fiber grating pressure ring is tested by internal fiber grating sensor ring body stress condition, indirectly reaction bridge cable stress condition, when pressure ring is subjected to external pressure, produces deformation, fiber grating first senses the deformation of pressure ring, so that the center wavelength accepted by fiber grating changes, and external equipment obtains pressure value according to the change of wavelength.

[0003] The deformation part of the existing fiber grating pressure ring is usually a pressure ring, which needs to bear the function of constituting the device body, so the force required for deformation is large and the degree of deformation is low, resulting in low sensitivity of the fiber grating sensor. At the same time, the pressure ring is directly in contact with air or the test site, which causes the external temperature to have a greater impact on the pressure ring, resulting in that the detection of pressure is easily disturbed by temperature.

[0004] Therefore, in view of the above problems, a fiber grating pressure ring can be designed, which is provided with a heat insulation structure outside the stress deformation part to prevent temperature changes from causing errors in pressure detection, and the deformation part is separately provided to enable the deformation part to be designed to be more easily deformed to enhance sensitivity. SUMMARY

[0005] In order to overcome the problem that the deformation part of most fiber grating pressure rings is usually a pressure ring, which needs to bear the function of constituting the device body, so the force required for deformation is large and the degree of deformation is low, resulting in low sensitivity of the fiber grating sensor. At the same time, the pressure ring is directly in contact with air or the test site, which causes the external temperature to have a greater impact on the pressure ring, resulting in that the detection of pressure is easily disturbed by temperature.

[0006] The technical scheme of the utility model is as follows: a fiber grating pressure ring, comprising a fiber grating sensor, a stress column and a shell assembly, the shell assembly comprises an outer protective shell and an inner protective shell, the fiber grating sensor is provided with a stress column on one side, the stress column is made of elastic metal and designed as a thin wall, the upper and lower ends of the stress column are provided with a movable ring, the inner side of the movable ring is provided with the inner protective shell, the outer side of the movable ring is provided with the outer protective shell, the movable ring is slidably connected with the outer protective shell and the inner protective shell, the outer protective shell and the inner protective shell are designed as hollow, the inner part of the outer protective shell and the inner protective shell is filled with a heat insulation layer, and the heat insulation layer is made of heat insulation material.

[0007] As preferred, the upper part of the upper movable ring is provided with an upper force receiving block, the bottom of the movable ring is provided with a lower force receiving block, and the upper force receiving block and the lower force receiving block are in sliding connection with the inner protective shell and the outer protective shell.

[0008] As preferred, the upper force receiving block and the lower force receiving block are hollow and filled with a heat insulation layer.

[0009] As preferred, the inner side of the inner protective shell is provided with a support column, and the support column is provided with multiple groups of circumferentially equidistantly arranged support columns.

[0010] As preferred, the outer ring of the inner protective shell and the inner ring of the outer protective shell are provided with guide protrusions, and the guide protrusions are provided with multiple groups of circumferentially equidistantly arranged guide protrusions.

[0011] As preferred, the connection part of the upper force receiving block, the lower force receiving block and the movable ring and the guide protrusion is provided with a guide slot.

[0012] As preferred, the two ends of the force receiving column are provided with mounting rods, and the connection part of the movable ring and the mounting rod is provided with a mounting hole.

[0013] The beneficial effects of the utility model are as follows:

[0014] The outer protective shell, the inner protective shell and the movable ring constitute the device main body, the force receiving column does not need to participate in the structure, so that the force receiving column can be made of elastic metal and designed as a thin wall, so that the force receiving column is more easily deformed under stress, thereby enhancing the sensing sensitivity of the fiber grating sensor and the pressure detection sensitivity, and the heat insulation layer is filled in the outer protective shell and the inner protective shell to achieve heat insulation, thereby reducing the temperature change range of the closed environment of the force receiving column, and greatly reducing the pressure detection error caused by the deformation of the force receiving column due to temperature change. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A three-dimensional structure schematic view of the fiber grating pressure ring is shown.

[0016] Figure 2 A three-dimensional structure schematic view of the inner protective shell of the fiber grating pressure ring is shown.

[0017] Figure 3 A three-dimensional structure schematic view of the heat insulation layer of the fiber grating pressure ring is shown.

[0018] Figure 4 A three-dimensional structure schematic view of the force receiving column of the fiber grating pressure ring is shown.

[0019] Explanation of reference signs: 1, outer protective shell; 2, inner protective shell; 3, upper stress block; 4, lower stress block; 5, movable ring; 6, stress column; 7, fiber grating sensor; 8, heat insulation layer; 201, guide protrusion; 301, support column; 302, guide slot; 501, mounting hole; 601, mounting rod. DETAILED DESCRIPTION

[0020] The utility model is further explained below in combination with the drawings and examples.

[0021] Please refer to Figures 1-4 The utility model provides an embodiment: a fiber grating pressure ring, including fiber grating sensor 7, stress column 6 and shell assembly, shell assembly includes outer protective shell 1, inner protective shell 2, one side of fiber grating sensor 7 is provided with stress column 6, stress column 6 adopts elastic metal and is designed as thin wall, and the upper and lower ends of stress column 6 are provided with movable ring 5, the inner side of movable ring 5 is provided with inner protective shell 2, the outer side of movable ring 5 is provided with outer protective shell 1, and movable ring 5 is connected with outer protective shell 1 and inner protective shell 2 slidingly, outer protective shell 1 and inner protective shell 2 are designed as hollow, and the inside of outer protective shell 1 and inner protective shell 2 is filled with heat insulation layer 8, and heat insulation layer 8 is made of heat insulation material;Device main part is constituted by setting outer protective shell 1, inner protective shell 2 and movable ring 5, stress column 6 does not need to participate in the structure, so that stress column 6 can be made of elastic metal and be designed as thin wall, stress column 6 is more easily deformed when being stressed, thereby the perception sensitivity of fiber grating sensor 7 is enhanced, and the pressure detection sensitivity is enhanced, and heat insulation layer 8 is filled in the inside of outer protective shell 1 and inner protective shell 2 simultaneously, heat insulation is carried out, the temperature variation range of the closed environment where stress column 6 is located is reduced, thereby the pressure detection error caused by the deformation of stress column 6 due to temperature variation is greatly reduced.

[0022] Please refer to Figure 3In the embodiment, the upper part of the movable ring 5 is provided with an upper force receiving block 3, the bottom of the movable ring 5 is provided with a lower force receiving block 4, the upper force receiving block 3 and the lower force receiving block 4 are in sliding connection with the inner protective shell 2 and the outer protective shell 1, the upper force receiving block 3 and the lower force receiving block 4 are hollow and filled with a heat insulation layer 8, the inner side of the inner protective shell 2 is provided with a plurality of support columns 301 arranged at equal intervals in the circumferential direction, the outer ring of the inner protective shell 2 and the inner ring of the outer protective shell 1 are provided with a plurality of guide protrusions 201 arranged at equal intervals in the circumferential direction, and the connection positions of the upper force receiving block 3, the lower force receiving block 4 and the movable ring 5 with the guide protrusions 201 are provided with guide grooves 302.

[0023] Please refer to Figure 4 In the embodiment, the two ends of the force receiving column 6 are provided with mounting rods 601, and the connection positions of the movable ring 5 and the mounting rods 601 are provided with mounting holes 501; during installation, the mounting rods 601 can be inserted into the mounting holes 501 to install the force receiving column 6, and different numbers of force receiving columns 6 can be selected for pressure detection according to needs.

[0024] During pressure detection, the upper force receiving block 3 and the lower force receiving block 4 are stressed and push the movable ring 5 to slide inside the outer protective shell 1 and the inner protective shell 2, and transmit the pressure to the force receiving column 6 to make the force receiving column 6 deform under pressure, the wavelength of the internal light of the fiber grating sensor 7 changes when the force receiving column 6 deforms, and the external device obtains the pressure value according to the wavelength change;

[0025] During use, the force receiving column 6 does not need to participate in the structure, so that the force receiving column 6 can be made of elastic metal and designed as a thin-walled structure, so that the force receiving column 6 is more likely to deform under stress, thereby enhancing the sensing sensitivity of the fiber grating sensor 7 and the pressure detection sensitivity, and the heat insulation layer 8 performs heat insulation, reduces the temperature change range of the closed environment of the force receiving column 6, and greatly reduces the pressure detection error caused by the deformation of the force receiving column 6 due to temperature change.

[0026] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A fiber Bragg grating pressure ring comprising a fiber Bragg grating sensor (7); characterized in that: The stress column (6) and the shell assembly are further included, the shell assembly includes the outer protective shell (1) and the inner protective shell (2), one side of the fiber grating sensor (7) is provided with the stress column (6), the stress column (6) is made of elastic metal and is designed as a thin wall, the upper and lower ends of the stress column (6) are provided with the movable ring (5), the inner side of the movable ring (5) is provided with the inner protective shell (2), the outer side of the movable ring (5) is provided with the outer protective shell (1), the movable ring (5) is slidably connected with the outer protective shell (1) and the inner protective shell (2), the outer protective shell (1) and the inner protective shell (2) are designed as a hollow, the inner part of the outer protective shell (1) and the inner protective shell (2) is filled with the heat insulation layer (8), the heat insulation layer (8) is made of heat insulation material.

2. A fiber optic Bragg grating pressure ring according to claim 1, wherein: The upper part of the movable ring (5) is provided with the upper stress block (3), the bottom of the movable ring (5) is provided with the lower stress block (4), the upper stress block (3) and the upper stress block (3) are slidably connected with the inner protective shell (2) and the outer protective shell (1).

3. A fibre optic pressure ring according to claim 2, wherein: The upper stress block (3) and the lower stress block (4) are designed as a hollow and also filled with the heat insulation layer (8).

4. A fiber optic Bragg grating pressure ring according to claim 2, wherein: The inner side of the inner protective shell (2) is provided with the support column (301), the support column (301) is provided with multiple groups and arranged in a circumferential equidistant manner.

5. The fiber optic Bragg grating pressure ring of claim 1, wherein: The outer ring of the inner protective shell (2) and the inner ring of the outer protective shell (1) are provided with the guide protruding block (201), the guide protruding block (201) is provided with multiple groups and arranged in a circumferential equidistant manner.

6. A fibre optic pressure ring according to claim 5, wherein: The connection part of the upper stress block (3), the lower stress block (4) and the movable ring (5) and the guide protruding block (201) is provided with the guide slot (302).

7. A fiber optic Bragg grating pressure ring according to claim 1, wherein: The two ends of the stress column (6) are provided with the mounting rod (601), the connection part of the movable ring (5) and the mounting rod (601) is provided with the mounting hole (501). The two ends of the stress column (6) are provided with the mounting rod (601), the connection part of the movable ring (5) and the mounting rod (601) is provided with the mounting hole (501).

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