Pipe clamp device for fiber bragg grating sensor on heating surface of boiler

Abstract

The utility model relates to the technical field of boiler heating surfaces, in particular to a boiler heating surface fiber bragg grating sensor pipe clamp device which comprises two bases, and kidney-shaped holes are formed in the bases. The pressing plate is arranged between the two bases, a flexible steel belt is arranged between the pressing plate and the bases, one end of the flexible steel belt is fixedly connected with the bases, and the other end of the flexible steel belt is arranged in the pressing plate in a sliding mode; the two compression bolts are spirally arranged on the pressing plate and used for compressing the flexible steel belt; according to the pipe clamp device for the fiber bragg grating sensor on the heating surface of the boiler, the fiber bragg grating sensor is placed in the semi-elliptical space, the height of the pressing plate is adjusted by adjusting the length of the flexible steel belt, and then the fiber bragg grating sensor is pressed tightly. And according to different lengths of the flexible steel belt, pressing of fiber grating sensors with different sizes is realized.

Description

Technical Field

[0001] This utility model relates to the field of boiler heating surface technology, and in particular to a fiber optic grating sensor clamp device for boiler heating surface. Background Technology

[0002] As boiler temperatures increase, the demand for boiler operational safety is also growing, and the selection of materials for the steam heating surfaces of the boiler tubes directly affects boiler operational safety. Generally, the higher the temperature of the working fluid within the steam heating surface, the higher the grade of heat-resistant steel required, and consequently, the higher the manufacturing cost. To control manufacturing costs, currently, the lowest grade of steel with a temperature higher than the tube wall temperature is typically used, based on the tube wall temperature under operating conditions. However, due to discrepancies between actual operating conditions and design calculations, accidents such as tube rupture caused by using steel of an insufficient grade for the heating surface can easily occur. To ensure detection effectiveness, fiber optic grating sensors are frequently used for monitoring.

[0003] Fiber shape sensing technology is a new research direction in the field of fiber optic sensing in recent years. Fiber optic shape sensors utilize a combination of several optical fibers arranged in a specific spatial pattern to measure the position and shape of the fiber or the object being measured. The measurement basis of fiber optic shape sensing technology is obtaining the strain response caused by deformation along the fiber transmission path. Fiber optic sensors have many advantages, such as high sensitivity, small size, and strong adaptability to environments with high pressure, high temperature, and strong electromagnetic interference, and have been widely used in medical, aerospace, petrochemical, and construction industries. Fiber optic sensors are particularly effective in environments with small deformation and long-term stable strain conditions.

[0004] The original sensor had a complex structure, poor stability, could not perform distributed measurements, and had low accuracy. It was also susceptible to interference from external factors such as temperature and electromagnetic fields. Later, fiber Bragg grating sensors were developed. The optical fibers in these sensors are typically kept taut; however, these fibers are prone to overstretching and breaking under tension and becoming loose under pressure.

[0005] In view of this, a fiber optic grating sensor clamp device for boiler heating surface is provided to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a boiler heating surface fiber grating sensor clamp device.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a boiler heating surface fiber optic grating sensor clamp device, comprising...

[0008] The base consists of two parts, and the base has a waist hole inside.

[0009] A pressure plate is disposed between the two bases. A flexible steel strip is provided between the pressure plate and the base. One end of the flexible steel strip is fixedly connected to the base, and the other end of the flexible steel strip is slidably disposed inside the pressure plate.

[0010] There are two clamping bolts, which are spirally arranged on the pressure plate and are used to clamp the flexible steel strip;

[0011] The base, pressure plate, and flexible steel strip form a semi-elliptical space, which can effectively eliminate the error caused by the expansion of the pipe clamp due to ambient temperature.

[0012] As a further description of the above technical solution: an abutment bolt is spirally connected at the upper center of the pressure plate, and an abutment plate is rotatably connected to the bottom end of the abutment bolt. The bottom surface of the abutment plate is arc-shaped.

[0013] As a further description of the above technical solution: the ground surfaces of the pressure plate and the abutment plate are both provided with a flexible layer that can withstand high temperatures.

[0014] As a further description of the above technical solution: the flexible steel strip is made of spring steel.

[0015] This utility model has the following beneficial effects:

[0016] The boiler heating surface fiber Bragg grating sensor clamp device designed in this utility model places the fiber Bragg grating sensor inside a semi-elliptical space. The height of the pressure plate is adjusted by adjusting the length of the flexible steel strip, thereby achieving the clamping of the fiber Bragg grating sensor. Depending on the length of the flexible steel strip, different sizes of fiber Bragg grating sensors can be clamped. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the fiber optic grating sensor clamp device for the boiler heating surface in this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the fiber optic grating sensor clamp device for the boiler heating surface in this utility model.

[0019] Legend:

[0020] 10-Base, 20-Flexible steel strip, 30-Pressure plate, 40-Abutting bolt, 50-Clamping bolt, 60-Abutting plate, 70-Oval space. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please see Figure 1-2 In this invention, a technical solution is provided:

[0025] The boiler heating surface fiber Bragg grating sensor clamp device includes:

[0026] There are two bases 10. Each base 10 has a waist hole inside and is installed on the boiler heating surface through the waist hole.

[0027] A pressure plate 30 is disposed between two bases 10. A flexible steel strip 20 is disposed between the pressure plate 30 and the bases 10. One end of the flexible steel strip 20 is fixedly connected to the base 10, and the other end of the flexible steel strip 20 is slidably disposed inside the pressure plate 30. The height of the pressure plate 30 can be adjusted by sliding the flexible steel strip 20, thereby achieving the clamping and fixing of fiber optic grating sensors of different sizes.

[0028] There are two clamping bolts 50, with their spirals set on the pressure plate 30, used to clamp the flexible steel strip 20 and fix the flexible steel strip 20.

[0029] A semi-elliptical space 70 is formed between the base 10, the pressure plate 30, and the flexible steel strip 20. The semi-elliptical space 70 can effectively eliminate the error caused by the expansion of the pipe clamp due to ambient temperature.

[0030] In the above, the fiber Bragg grating sensor is placed inside the semi-elliptical space 70. The height of the pressure plate 30 is adjusted by adjusting the length of the flexible steel strip 20, thereby pressing the fiber Bragg grating sensor. Depending on the length of the flexible steel strip 20, fiber Bragg grating sensors of different sizes can be pressed.

[0031] Furthermore, a retaining bolt 40 is spirally connected to the upper center of the pressure plate 30, and a retaining plate 60 is rotatably connected to the bottom end of the retaining bolt 40. The bottom surface of the retaining plate 60 is arc-shaped. Thus, when the pressure plate 30 cannot contact the fiber Bragg grating sensor, the height of the retaining bolt 40 is adjusted to move the retaining plate 60, thereby pressing the fiber Bragg grating sensor and expanding the clamping range of the tube clamp.

[0032] Furthermore, in order to protect the fiber Bragg grating sensor and prevent damage from excessive force, the ground surfaces of the pressure plate 30 and the abutment plate 60 are both provided with a flexible layer that can withstand high temperatures, such as rubber or polyurethane.

[0033] Furthermore, the flexible steel strip 20 is made of spring steel, which facilitates deformation and thus facilitates the movement of the flexible steel strip 20 inside the pressure plate 30.

[0034] Working principle: Two bases 10 are installed on the boiler heating surface through oblong holes. The oblong design of the oblong holes allows for adjustment of the base spacing to adapt to different installation positions. One end of the flexible steel strip 20 is fixed to the base 10, and the other end passes through the sliding channel inside the pressure plate 30, forming an adjustable linkage structure. By sliding the flexible steel strip 20, the height of the pressure plate is adjusted so that the semi-elliptical space formed between the pressure plate 30 and the base 10 is adapted to the sensor size. After adjustment, the clamping bolts 50 on the pressure plate 30 are tightened to lock the position of the flexible steel strip 20, forming a stable clamp. The sensor is fixed within the semi-elliptical space 70, pressed directly by the pressure plate 30 or assisted by the abutment plate 60. When the sensor size is small and the pressure plate 30 cannot be directly contacted, the abutment bolt 40 above the pressure plate 30 is screwed on to push the arc-shaped abutment plate 60 at the bottom down. When the temperature changes, the semi-elliptical structure absorbs the displacement of the base and pressure plate caused by thermal expansion through elastic deformation. Its geometry allows stress dispersion, avoiding the rigid structure from applying additional stress to the sensor due to expansion / contraction, thereby eliminating the measurement error introduced by temperature.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A boiler heating surface fiber grating sensor tube clamp device, characterized in that: The utility model provides a pipe clamp, including The base is internally provided with a waist hole; The pressing plate is provided between the two bases, and a flexible steel belt is provided between the pressing plate and the base, one end of the flexible steel belt is fixedly connected with the base, and the other end of the flexible steel belt is slidably arranged in the pressing plate; Two compression bolts are spirally arranged on the pressing plate and used for compressing the flexible steel belt; The base, the pressing plate and the flexible steel belt form a semi-elliptical space, and the semi-elliptical space can effectively eliminate the error caused by the expansion of the pipe clamp due to the environmental temperature.

2. The boiler heating surface fiber grating sensor tube clamp apparatus according to claim 1, characterized in that: A butt screw is spirally connected to the center position of the upper end of the pressing plate, the bottom end of the butt screw is rotatably connected with a butt plate, and the bottom surface of the butt plate is arc-shaped.

3. The boiler heating surface fiber grating sensor tube clamp apparatus according to claim 1, characterized in that: The ground of the pressing plate and the butt plate is provided with a flexible layer that can resist high temperature.

4. The FBG sensor tube sheet clamp apparatus of claim 1, wherein: The flexible steel belt is made of spring steel.

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