Device suitable for measuring temperature of thin-walled tube and method for measuring temperature of thin-walled tube

Abstract

The embodiment of the invention relates to the technical field of temperature measurement, in particular to a device suitable for measuring the temperature of a thin-walled pipe and a method for measuring the temperature of the thin-walled pipe, the device comprises an optical fiber temperature sensor, a pipe fitting, a first fixing piece and a second fixing piece, the optical fiber temperature sensor comprises a measuring part and a non-measuring part, the measuring part extends to penetrate through the first fixing piece, is fixed to the pipe fitting and is used for measuring the temperature of the thin-walled pipe, and the non-measuring part extends outside the pipe fitting; the first fixing piece is arranged to position the measuring part when the measuring part is fixed on the pipe fitting; and the second fixing piece is arranged to fix the measuring part to the pipe fitting and is used for preventing the measuring part from tilting from the pipe fitting. Through the device provided by the invention, the measurement of the thin-walled tube can be realized, and further, the second fixing piece can be utilized to prevent the measurement part from tilting from the tube in the process of assembling the device to the thin-walled tube, so that the reliable measurement of the device to the thin-walled tube is ensured.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of temperature measurement, and particularly to a device suitable for measuring the temperature of a thin-walled tube and a method for measuring the temperature of a thin-walled tube. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the rapid development of modern industry, the demand for miniaturization of heat exchange equipment is increasing day by day. Narrow-gap annular flow channel heat transfer, with its characteristics such as compact structure, high heat transfer coefficient, and large heat transfer area, has the application prospect in the miniaturized design of heat exchange equipment. In order to deeply understand the heat transfer characteristics of narrow-gap annular flow channels, it is necessary to accurately measure the wall temperatures of the inner and outer walls of narrow-gap annular flow channels, so as to deduce the fluid temperature in narrow-gap annular flow channels. Summary of the Invention

[0004] A brief overview of the present application is given below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is only to present certain concepts in a simplified form as a prelude to the more detailed description to follow.

[0005] In a first aspect, embodiments of the present application provide a device suitable for measuring the temperature of a thin-walled tube, which includes: an optical fiber temperature sensor, a pipe fitting, a first fixing member, and a second fixing member. The optical fiber temperature sensor includes a measuring part and a non-measuring part. The measuring part is arranged to extend through the first fixing member and be fixed to the pipe fitting and is used for measuring the temperature of the thin-walled tube, and the non-measuring part extends outside the pipe fitting; the first fixing member is arranged to position the measuring part when fixing the measuring part to the pipe fitting; the second fixing member is arranged to fix the measuring part to the pipe fitting to prevent the measuring part from tilting up from the pipe fitting.

[0006] Through the device provided by the present application, the measurement of the thin-walled tube can be realized. Further, by using the structure of the second fixing member, the measuring part can be prevented from tilting up from the pipe fitting during the process of assembling the device to the thin-walled tube. Thus, it is ensured that the measurement of the thin-walled tube by the device provided by the present application can be carried out reliably.

[0007] In a second aspect, embodiments of the present application provide a method for measuring the temperature of a thin-walled tube. The method uses the device provided in the first aspect of the present application and includes the following steps: S10: placing the device in a refrigerant for freezing; S20: taking out the frozen device from the refrigerant and using a power member to place the device into the thin-walled tube; S30: measuring the temperatures of different positions of the thin-walled tube by using the optical fiber temperature sensor.

[0008] In the embodiments of the present application, the device is placed in a refrigerant for freezing, causing the device to contract when cooled. When the device returns to room temperature, the pipe fitting will expand to closely fit with the thin-walled pipe, enabling the temperature measurement part of the fiber optic temperature sensor to closely fit with the thin-walled pipe, so as to measure the temperature of the thin-walled pipe using the fiber optic temperature sensor. Further, the power component can quickly place the device into the thin-walled pipe, avoiding temperature transfer between the device with a low surface temperature and the thin-walled pipe during the process of placing the device into the thin-walled pipe, which may cause the thin-walled pipe to contract due to temperature reduction. At the same time, it avoids problems such as the difficulty in welding and fixing the thin-walled pipe in the traditional measurement method, the impact on the size of the thin-walled pipe, and the measurement error caused by the indirect contact between the sensor and the pipe wall of the thin-walled pipe. Description of the Drawings

[0009] Other objects and advantages of the present application will become apparent and help to provide a comprehensive understanding of the present application through the description of the embodiments of the present application with reference to the drawings below.

[0010] Figure 1 is a schematic structural diagram of a device suitable for measuring the temperature of a thin-walled pipe according to an embodiment of the present application.

[0011] Figure 2 is a schematic diagram after the device suitable for measuring the temperature of a thin-walled pipe according to an embodiment of the present application is installed with the thin-walled pipe.

[0012] Figure 3 is a schematic structural diagram of a first fixing member according to an embodiment of the present application.

[0013] Figure 4 is a cross-sectional view of the connection between a pipe fitting and a first fixing member according to an embodiment of the present application.

[0014] Figure 5 is a schematic structural diagram of a pipe fitting according to an embodiment of the present application.

[0015] Figure 6 is a side view of a pipe fitting according to an embodiment of the present application.

[0016] Figure 7 is Figure 5 a cross-sectional view of area A of

[0017] Figure 8 is a schematic structural diagram of a second fixing member according to an embodiment of the present application.

[0018] Figure 9 is a flowchart of a method for measuring the temperature of a thin-walled pipe according to an embodiment of the present application.

[0019] Description of the Reference Numerals:

[0020] 1. A device suitable for measuring the temperature of a thin-walled tube;

[0021] 10. Optical fiber temperature sensor; 11. Measuring part; 12. Non-measuring part;

[0022] 20. Pipe fitting; 21. Groove; 22. Measuring part; 23. Necking part; 24. First fixing part mating portion;

[0023] 30. First fixing part; 31. Opening part; 311. Opening; 32. First fixing part; 33. Installation part;

[0024] 40. Second fixing part; 41. Second fixing part; 42. Anti-warping part; 43. Annular gap;

[0025] 50. Thin-walled tube.

[0026] It should be noted that the drawings are not necessarily drawn to scale, but are shown only in a schematic manner that does not affect the reader's understanding. Detailed implementation manners

[0027] Hereinafter, exemplary embodiments of the present application will be described with reference to the drawings. For clarity and conciseness, not all features of the actual implementation manners are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual implementation to achieve the developer's specific goals, for example, to comply with those limitations related to the system and business, and these limitations may vary with different implementation manners. In addition, it should also be understood that although the development work may be very complex and time-consuming, for those skilled in the art who benefit from the content of the present application, such development work is only a routine task.

[0028] Here, it should also be noted that in order to avoid obscuring the present application with unnecessary details, only the device structures and / or processing steps closely related to the solution according to the present application are shown in the drawings, while other details less related to the present application are omitted.

[0029] The inventors of the present application have found that in the prior art, the temperature measurement of the inner wall of a narrow-gap annular flow channel mostly adopts the method of directly arranging a temperature-measuring thermocouple at the flow channel. However, due to the narrow-gap annular flow channel being slender and having a small pipe diameter, directly arranging a traditional thermocouple inside the flow channel for temperature measurement has problems such as great difficulty in arrangement and poor stability in an electromagnetic environment, and it is difficult to meet the research requirements for the heat transfer characteristics of the narrow-gap annular flow channel.

[0030] Based on this, an embodiment of the present application provides a device suitable for measuring the temperature of a thin-walled tube. Figure 1 It is a schematic structural diagram of the device 1 suitable for measuring the temperature of a thin-walled tube according to an embodiment of the present application.Figure 2 is a schematic diagram after the device 1 for measuring the temperature of a thin-walled tube according to an embodiment of the present application is installed with the thin-walled tube 50. As Figure 1 and Figure 2 shown, the device 1 for measuring the temperature of a thin-walled tube includes: an optical fiber temperature sensor 10, a pipe fitting 20, a first fixing member 30, and a second fixing member 40. The optical fiber temperature sensor 10 includes a measuring portion 11 and a non-measuring portion 12. The measuring portion 11 is arranged to extend through the first fixing member 30 and be fixed to the pipe fitting 20 and is used to measure the temperature of the thin-walled tube 50. The non-measuring portion 12 is arranged to extend outside the pipe fitting 20; the first fixing member 30 is arranged to position the measuring portion 11 when fixing it to the pipe fitting 20; the second fixing member 40 is arranged to fix the measuring portion 11 to the pipe fitting 20 to prevent the measuring portion 11 from lifting from the pipe fitting 20.

[0031] Through the device provided by the present application, the measurement of the thin-walled tube 50 can be realized. Further, the structure of the second fixing member 40 can prevent the measuring portion 11 from lifting from the pipe fitting 20 during the process of assembling the device to the thin-walled tube 50. Thus, it is ensured that the measurement of the thin-walled tube 50 by the device provided by the present application can be carried out reliably.

[0032] By measuring the temperature of the thin-walled tube 50 forming a narrow-gap annular flow channel, the indirect measurement of the temperature of the narrow-gap annular flow channel is realized, eliminating the problem of interference with the flow state of the flow channel caused by directly arranging a temperature-measuring thermocouple at the flow channel.

[0033] In addition, since the original measurement signal of the optical fiber temperature sensor 10 is an optical signal and is not affected by the fluctuation of the electromagnetic environment, therefore, using the optical fiber temperature sensor 10 to measure the temperature of the thin-walled tube 50 can ensure the measurement stability of the device in a changing electromagnetic environment.

[0034] In some embodiments, the first fixing member 30 and the second fixing member 40 are respectively arranged at both ends of the pipe fitting 20 to fix the beginning and the end of the measuring portion 11 of the optical fiber temperature sensor 10 to the pipe fitting 20, improving the fixing stability of the optical fiber temperature sensor 10 and the pipe fitting 20.

[0035] As Figure 2 shown, in some embodiments, the device 1 for measuring the temperature of a thin-walled tube is arranged in the thin-walled tube 50, so that the optical fiber temperature sensor 10 is in direct contact with the inner wall of the thin-walled tube 50, and then the temperature of the narrow-gap annular flow channel is indirectly determined by directly measuring the temperature of the inner wall of the thin-walled tube 50.

[0036] In some embodiments, multiple temperature measurement points can be arranged on a single fiber optic temperature sensor 10, which solves the problem of fewer measurement points of a single thermocouple. Therefore, only a small number of fiber optic temperature sensors 10 need to be set to measure the temperatures at multiple positions of the thin-walled tube 50 simultaneously, simplifying the structure of the device for measuring the temperature of the thin-walled tube 50.

[0037] In some embodiments, the number, arrangement of the fiber optic temperature sensors 10, and the number of measurement points of a single fiber optic temperature sensor 10 can be set according to the actual measurement needs. Exemplarily, the number of fiber optic temperature sensors 10 can be set to 6, and the 6 fiber optic temperature sensors 10 can be arranged at equal intervals along the circumferential direction of the pipe fitting 20. The number of measurement points of each fiber optic temperature sensor 10 can be set to 10 to form a 6×10 temperature measurement point matrix, so as to be able to measure the temperatures at 60 uniformly distributed temperature measurement points on the inner wall of the thin-walled tube 50 simultaneously.

[0038] In some embodiments, the length of the pipe fitting 20 is set to be similar to or equal to the length of the thin-walled tube 50, so as to measure the temperatures at various positions of the thin-walled tube 50 through the fiber optic temperature sensor 10 fixed to the pipe fitting 20, and further obtain the temperature distribution of the entire thin-walled tube 50.

[0039] Figure 3 is a schematic structural diagram of the first fixing member 30 according to an embodiment of the present application. As Figure 3 shown, in some embodiments, the first fixing member 30 includes an opening part 31 and a first fixing part 32. The opening part 31 and the first fixing part 32 are integrally formed. The first fixing part 32 is set to be fixedly connected to the pipe fitting 20 and position it when fixing the measuring part 11 to the pipe fitting 20. A plurality of openings 311 are formed in the opening part 31, and the measuring part 11 is set to extend through the opening part 31 and be fixed to the pipe fitting 20.

[0040] In an embodiment of the present application, a plurality of openings 311 are formed in the opening part 31. The position of the measuring part 11 of the fiber optic temperature sensor 10 in the radial direction of the pipe fitting 20 is defined by the openings 311, so that the measuring part 11 can pass through the opening part 31 through the openings 311 and extend to the pipe fitting 20.

[0041] In some embodiments, the diameter of the openings 311 is set to be slightly larger than the diameter of the measuring part 11 of the fiber optic temperature sensor 10, so that the measuring part 11 can smoothly pass through the openings 311, and the openings 311 can guide the extending direction of the measuring part 11 of the fiber optic temperature sensor 10.

[0042] In some embodiments, the first fixing part 32 is a columnar structure, and a clearance thread is formed on the columnar structure. The clearance thread is fixedly connected to the pipe fitting 20 and positions the measuring part 11 when fixing the measuring part 11 to the pipe fitting 20.

[0043] In an embodiment of the present application, a clearance thread is formed on the columnar structure. During assembly, the first fixing portion 32 is inserted into the pipe fitting 20, and the first fixing portion 32 is rotated. By using the cooperation between the clearance thread of the first fixing portion 32 and the pipe fitting 20, a fixed connection between the first fixing portion 32 and the pipe fitting 20 is achieved. Moreover, the first fixing portion 32 further includes an opening portion 31 for fixing the measuring portion 11. Since the clearance thread can only rotate a predetermined angle, when the first fixing portion 32 is fixedly connected to the pipe fitting 20, the measuring portions 11 of multiple fixed optical fiber temperature sensors 10 can be accurately positioned at a predetermined position of the pipe fitting 20.

[0044] Figure 4 is a sectional view of the connection between the pipe fitting 20 and the first fixing member 30 according to an embodiment of the present application. As Figure 4 shown, in some embodiments, the pipe fitting 20 further includes a first fixing member mating portion 24, and a clearance thread that mates with the first fixing portion 32 is formed on the inner surface of the first fixing member mating portion 24. Exemplarily, the clearance threads formed by the first fixing member mating portion 24 and the first fixing portion 32 can be arranged at 90°. During assembly, the first fixing portion 32 is inserted into the first fixing member mating portion 24 of the pipe fitting 20 and rotated by 90°. By using the mutual cooperation between the clearance thread of the first fixing member mating portion 24 and the clearance thread of the first fixing portion 32, a threaded connection between the first fixing portion 32 and the pipe fitting 20 is achieved, and the measuring portion 11 of the optical fiber temperature sensor 10 is accurately positioned at the position after rotating 90° on the outer surface of the pipe fitting 20.

[0045] As Figure 3 shown, in some embodiments, the first fixing member 30 further includes a mounting portion 33, and the opening portion 31 is provided between the mounting portion 33 and the first fixing portion 32. Through the mounting portion 33, the device can be quickly inserted into the thin-walled pipe 50 by using a power member, thereby achieving a quick installation of the device and the thin-walled pipe 50.

[0046] In some embodiments, the mounting portion 33 is a columnar structure, and a thread is formed on the columnar structure. The thread is arranged to cooperate with the power member, so that the power member is threadedly connected to the mounting portion 33, and further a fixed connection between the power member and the device is achieved.

[0047] In some embodiments, the radial length of the opening portion 31 is greater than the radial length of the first fixing portion 32, so that the opening portion 31 limits the first fixing portion 32.

[0048] In some embodiments, the position of the opening 311 of the opening portion 31 is set outside the radial direction of the first fixing portion 32 to ensure that the measuring portion 11 of the optical fiber temperature sensor 10 is fixed to the outer surface of the pipe fitting 20. Exemplarily, the position of the opening 311 is set on a circumference that is concentric with the opening portion 31 and has a radius equal to the radius of the pipe fitting 20, so that the measuring portion 11 of the optical fiber temperature sensor 10 is in close contact with the outer surface of the pipe fitting 20.

[0049] As Figure 1 and Figure 3 shown, in some embodiments, the radial length of the opening portion 31 is greater than the radial length of the mounting portion 33 to avoid an obstacle to the non-measuring portion 12 of the optical fiber temperature sensor 10 caused by the fixed connection between the power component and the device, thereby ensuring that the optical fiber temperature sensor 10 is not damaged during the rapid assembly process of the device and the thin-walled pipe 50.

[0050] Figure 5 FIG. is a schematic structural view of the pipe fitting 20 according to an embodiment of the present application. Figure 6 FIG. is a side view of the pipe fitting 20 according to an embodiment of the present application. As Figure 5 and Figure 6 shown, in some embodiments, a plurality of grooves 21 are formed on the outer surface of the pipe fitting 20, and the optical fiber temperature sensor 10 is disposed in the plurality of grooves 21 and is arranged such that the optical fiber temperature sensor 10 is in contact with the thin-walled pipe 50.

[0051] In the embodiments of the present application, a plurality of grooves 21 are formed on the outer surface of the pipe fitting 20, thereby fixing the optical fiber temperature sensor 10 in the grooves 21 on the outer surface of the pipe fitting 20, preventing the optical fiber temperature sensor 10 from moving or shifting on the outer surface of the pipe fitting 20, and further being unable to accurately obtain the temperature at the predetermined temperature measurement point of the thin-walled pipe 50.

[0052] In some embodiments, the depth of the groove 21 is set such that the optical fiber temperature sensor 10 can be just buried therein and ensure that the highest point of the optical fiber temperature sensor 10 slightly protrudes from the outer surface of the pipe fitting 20, thereby ensuring that the optical fiber temperature sensor 10 can be in direct contact with the thin-walled pipe 50.

[0053] As Figure 6 shown, in some embodiments, the groove 21 is set as a U-shaped groove with straight sections on both sides and a semi-circular bottom, and the size of the groove 21 can be determined according to the size of the optical fiber temperature sensor 10. Exemplarily, the depth of the groove 21 can be equal to the radius of the optical fiber temperature sensor 10, and the diameter of the bottom semi-circle is the same as the diameter of the optical fiber temperature sensor 10, so that the optical fiber temperature sensor 10 slightly protrudes from the outer surface of the pipe fitting 20, and further enables the optical fiber temperature sensor 10 to be in direct contact with the thin-walled pipe 50.

[0054] In some embodiments, the relative positions of the multiple grooves 21 formed on the outer surface of the pipe 20 match the relative positions of the multiple openings 311 formed on the opening portion 31, so that during assembly, the first fixing portion 32 is inserted into the pipe 20, and the first fixing portion 32 is rotated to fix the first fixing portion 30 to the pipe 20, while the measuring portions 11 of the multiple optical fiber temperature sensors 10 are respectively positioned in the multiple grooves 21 formed on the outer surface of the pipe 20.

[0055] In some embodiments, the arrangement angle of the clearance threads between the first fixing member mating portion 24 and the first fixing portion 32 is consistent with the angle difference between the multiple grooves 21 and the corresponding multiple openings 311 of the pipe 20. For example, the clearance threads formed by the first fixing member mating portion 24 and the first fixing portion 32 can be arranged at 90 degrees. During assembly, the first fixing portion 32 is inserted into the pipe 20 and rotated 90 degrees to achieve a threaded connection between the first fixing portion 32 and the pipe 20. The measuring portions 11 of the multiple optical fiber temperature sensors 10 are respectively positioned in the multiple grooves 21 of the pipe 20 after being rotated 90 degrees. This avoids positioning deviation of the measuring portions 11 that may be caused by a fully threaded connection between the first fixing member mating portion 24 and the first fixing portion 32.

[0056] like Figure 7 As shown, Figure 7 yes Figure 5 In some embodiments, the depth of the groove 21 at the position where the second fixing member 40 cooperates along the extension direction of the optical fiber temperature sensor 10 is deeper than the depth at other positions, so that the end of the optical fiber temperature sensor 10 can be embedded in the groove 21, thereby preventing the end portion of the optical fiber temperature sensor 10 from warping.

[0057] like Figure 5 and Figure 7 As shown, in some embodiments, the pipe 20 includes: a measuring portion 22 and a closing portion 23. The depth of the groove 21 formed by the measuring portion 22 remains unchanged, and its depth is set to be equal to the radius of the optical fiber temperature sensor 10, so that the optical fiber temperature sensor 10 slightly protrudes from the outer surface of the pipe 20, thereby ensuring that the optical fiber temperature sensor 10 can directly contact the thin-walled tube 50; the closing portion 23 is configured to be fixedly connected to the second, and the depth of the groove 21 formed by the closing portion 23 gradually increases along the extension direction of the optical fiber temperature sensor 10, so that the optical fiber temperature sensor 10 gradually retracts in the groove 21, ensuring that the surface of the optical fiber temperature sensor 10 no longer protrudes from the groove 21 tube, thereby avoiding direct contact between the optical fiber temperature sensor 10 and the thin-walled tube 50.

[0058] In some embodiments, the depth of the shallowest part of the groove 21 formed by the closing part 23 is equal to the radius of the fiber optic temperature sensor 10, and the depth of the deepest part is equal to the diameter of the fiber optic temperature sensor 10, so as to ensure that the depth of the groove 21 formed by the closing part 23 gradually increases along the depth of the groove 21 formed by the measuring part 22, and the end of the fiber optic temperature sensor 10 is completely received in the groove 21 formed by the measuring part 22, avoiding the warping of the fiber optic temperature sensor 10 caused by the discontinuity of the depth, thereby preventing the fiber optic temperature sensor 10 from directly contacting the thin-walled tube 50.

[0059] As Figure 4 shown, in some embodiments, the first fixing part mating portion 24 is arranged on the inner surface of the measuring part 22 away from the closing part 23, so as to use the first fixing part 30 and the second fixing part 40 to realize the fixing of the fiber optic temperature sensor 10 at both ends of the pipe fitting 20.

[0060] Figure 8 is a schematic structural view of the second fixing part 40 according to an embodiment of the present application. As Figure 8 shown, in some embodiments, the second fixing part 40 includes a second fixing portion 41 and an anti-warping portion 42. The second fixing portion 41 and the anti-warping portion 42 are integrally formed. The second fixing portion 41 is arranged to be fixedly connected to the pipe fitting 20, and the anti-warping portion 42 is arranged to cooperate with the pipe fitting 20, so that the end of the fiber optic temperature sensor 10 extending on the pipe fitting 20 can be prevented from warping under the action of the anti-warping portion 42.

[0061] In the embodiment of the present application, since the second fixing portion 41 and the anti-warping portion 42 are integrally formed, it is possible to fixedly connect the second fixing part 40 to the pipe fitting 20 while preventing the end portion of the fiber optic temperature sensor 10 from warping and causing damage to the fiber optic temperature sensor 10.

[0062] In some embodiments, the second fixing portion 41 is a columnar structure, the anti-warping portion 42 is a columnar structure, and an annular gap 43 is formed therebetween. The end of the fiber optic temperature sensor 10 extending on the pipe fitting 20 can be arranged in the annular gap 43.

[0063] In the embodiment of the present application, the depth of the groove 21 formed by the pipe fitting 20 at the position where it cooperates with the second fixing part 40 is deeper than the depth at other positions, so as to position the end of the fiber optic temperature sensor 10 to the annular gap 43 formed by the second fixing portion 41 and the anti-warping portion 42, thereby preventing the fiber optic temperature sensor 10 from being damaged due to the warping of the end of the fiber optic temperature sensor 10 during the assembly process.

[0064] In some embodiments, the second fixing portion 41 is arranged as a columnar structure smaller than the diameter of the pipe fitting 20, and the anti-warping portion 42 is arranged as a columnar structure equal to the diameter of the pipe fitting 20, so that the second fixing portion 41 can be placed into the pipe fitting 20 to achieve the fixed connection between the second fixing portion 41 and the pipe fitting 20, and the anti-warping portion 42 is used to limit the second fixing portion 41.

[0065] In some embodiments, the annular gap 43 formed by the second fixing portion 41 and the anti-warping portion 42 is arranged to match the size of the fiber optic temperature sensor 10, ensuring that the annular gap 43 can inwardly accommodate the end of the fiber optic temperature sensor 10 to achieve the fixation of the end of the fiber optic temperature sensor 10.

[0066] In some embodiments, threads are formed on the surface of the second fixing portion 41, and threads matching the second fixing portion 41 are formed on the inner surface of the end of the closing portion 23 away from the measuring portion 22. During assembly, the second fixing portion 41 is inserted into the pipe fitting 20, and by rotating the second fixing member 40, the threaded connection between the second fixing member 40 and the pipe fitting 20 is achieved.

[0067] In some embodiments, the bottom surface of the second fixing portion 41 is chamfered to facilitate the fixed connection between the second fixing portion 41 and the pipe fitting 20.

[0068] In some embodiments, the pipe fitting 20, the first fixing member 30, and the second fixing member 40 are all made of the same metal material, ensuring that all parts of the device have a consistent coefficient of thermal expansion to ensure the consistency of the overall expansion or contraction degree of the device in different thermal environments. Specifically, those skilled in the art can determine the materials of the pipe fitting 20, the first fixing member 30, and the second fixing member 40 according to the material of the thin-walled tube 50 and the actual working conditions of the narrow-gap annular flow channel.

[0069] In some embodiments, the wall thickness of the pipe fitting 20 is set to be greater than the wall thickness of the thin-walled tube 50, so that the thermal expansion degree of the pipe fitting 20 is greater than that of the thin-walled tube 50 in the same thermal environment. Furthermore, through the extrusion of the fiber optic temperature sensor 10 during the expansion of the pipe fitting 20, the fitting degree between the fiber optic temperature sensor 10 and the inner wall of the thin-walled tube 50 is further improved.

[0070] The embodiment of the present application further provides a method for measuring the temperature of the thin-walled tube 50, and the method uses the device provided in the first aspect of the present application.

[0071] Figure 9 It is a flowchart of the method for measuring the temperature of the thin-walled tube 50 according to the embodiment of the present application. As Figure 9As shown in the figure, it includes the following steps: S10: Place the device in the refrigerant for freezing; S20: Take out the frozen device from the refrigerant and use the power component to place the device into the thin-walled tube 50; S30: Use the fiber optic temperature sensor 10 to measure the temperatures at different positions of the thin-walled tube 50.

[0072] In the embodiment of the present application, the device is placed in the refrigerant for freezing, so that the device contracts when cooled. When the device returns to the normal temperature state, the pipe fitting 20 will expand to closely fit with the thin-walled tube 50, so that the temperature measurement part 11 of the fiber optic temperature sensor 10 closely fits with the thin-walled tube 50, so as to use the fiber optic temperature sensor 10 to measure the temperature of the thin-walled tube 50. Further, the device can be quickly placed into the thin-walled tube 50 through the power component, avoiding temperature transfer between the device with a low surface temperature and the thin-walled tube 50 during the process of placing the device into the thin-walled tube 50, resulting in the contraction of the thin-walled tube 50 due to the decrease in temperature. At the same time, it avoids problems such as the difficulty of welding and fixing the thin-walled tube 50 in the traditional measurement method, the influence on the size of the thin-walled tube 50, and the measurement error caused by the indirect contact between the sensor and the wall of the thin-walled tube 50.

[0073] In some embodiments, the power component can be selected as a cylinder, so as to quickly place the device into the thin-walled tube 50 by using the cylinder.

[0074] In some embodiments, before the step S20, the following steps are further included: heating the thin-walled tube 50 and stopping heating after the temperature of the thin-walled tube 50 is uniform.

[0075] In the embodiment of the present application, the thin-walled tube 50 is heated to make the thin-walled tube 50 expand when heated, so as to facilitate the smooth placement of the device into the thin-walled tube 50. And stopping heating after the temperature of the thin-walled tube 50 is uniform can ensure that the expansion degrees of all parts of the thin-walled tube 50 are the same. Furthermore, after the thin-walled tube 50 returns to the normal temperature state, all parts of the thin-walled tube 50 can closely fit with the pipe fitting 20 and the fiber optic temperature sensor 10.

[0076] The following further illustrates the process of measuring the temperature of the thin-walled tube 50 using the method in the present application with specific examples.

[0077] Select the pipe fitting 20 formed with 6 grooves 21, evenly arrange 10 measurement points on the measurement parts 11 of the 6 fiber optic temperature sensors 10, and respectively fix the 6 fiber optic temperature sensors 10 in the 6 grooves 21 of the pipe fitting 20 to form a temperature measurement matrix with 6×10, a total of 60 temperature measurement points.

[0078] Immerse the device in liquid nitrogen for freezing. At the same time, place the thin-walled tube 50 in a muffle furnace for heating. After the temperatures of the device and the thin-walled tube 50 are uniform, take out the device and the thin-walled tube 50 from the liquid nitrogen and the muffle furnace respectively. Connect the cylinder to the mounting portion 33 of the first fixing member 30, and quickly place the device into the thin-walled tube 50 by using the cylinder. After the temperature of the thin-walled tube 50 drops and remains at room temperature, mate the thin-walled tube 50 with the outer sleeve to form a narrow-gap annular flow channel. Turn on the 6 fiber optic temperature sensors 10 to measure the temperatures at 60 temperature measurement points of the thin-walled tube 50.

[0079] For the embodiments of the present application, it should also be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0080] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An apparatus suitable for measuring the temperature of a thin-walled tube, characterized in that, It includes: An optical fiber temperature sensor, a pipe fitting, a first fixing member, and a second fixing member. The optical fiber temperature sensor includes a measuring portion and a non-measuring portion. The measuring portion is arranged to extend through the first fixing member and be fixed to the pipe fitting and is used to measure the temperature of the thin-walled pipe. The non-measuring portion extends outside the pipe fitting. The first fixing member is arranged to position the measuring portion when fixing the measuring portion to the pipe fitting. The second fixing member is arranged to fix the measuring portion to the pipe fitting to prevent the measuring portion from warping up from the pipe fitting.

2. The device according to claim 1, characterized in that The first fixing member includes an opening portion and a first fixing portion, and the opening portion and the first fixing portion are integrally formed. The first fixing portion is arranged to be fixedly connected to the pipe fitting and position the measuring portion when fixing the measuring portion to the pipe fitting. A plurality of openings are formed in the opening portion, and the measuring portion is arranged to extend through the opening portion and be fixed to the pipe fitting.

3. The device according to claim 2, characterized in that The first fixing portion is a columnar structure, and a clearance thread is formed on the columnar structure. The clearance thread is fixedly connected to the pipe fitting and positions the measuring portion when fixing the measuring portion to the pipe fitting.

4. The device according to claim 2, characterized in that The first fixing member further includes a mounting portion. The opening portion is arranged between the mounting portion and the first fixing portion. Through the mounting portion, the device can be quickly inserted into the thin-walled pipe by using a power member.

5. The device according to claim 4, characterized in that The mounting portion is a columnar structure, and a thread is formed on the columnar structure. The thread is arranged to cooperate with the power member.

6. The device according to claim 5, characterized in that The radial length of the opening portion is greater than the radial length of the first fixing portion.

7. The device according to claim 6, characterized in that The opening position of the opening portion is arranged outside the radial direction of the first fixing portion.

8. The device according to claim 5, characterized in that The radial length of the opening portion is greater than the radial length of the mounting portion.

9. The device according to any one of claims 1-8, characterized in that A plurality of grooves are formed on the outer surface of the pipe fitting, and the optical fiber temperature sensor is arranged in the plurality of grooves and is arranged such that the optical fiber temperature sensor contacts the thin-walled pipe.

10. The device according to claim 9, characterized in that The depth of the groove along the extending direction of the optical fiber temperature sensor at the position where it cooperates with the second fixing member is deeper than the depth at other positions.

11. The device according to claim 1, characterized in that The second fixing member includes a second fixing portion and an anti-warping portion, and the second fixing portion and the anti-warping portion are integrally formed. The second fixing portion is arranged to be fixedly connected to the pipe fitting. The anti-warping part is configured to cooperate with the pipe fitting, so that the end of the optical fiber temperature sensor extending on the pipe fitting can be prevented from warping under the action of the anti-warping part.

12. The device according to claim 11, wherein The second fixing part is a columnar structure, and the anti-warping part is a columnar structure, and an annular gap is formed between the two. The end of the optical fiber temperature sensor extending on the pipe fitting can be arranged in the annular gap.

13. A method for measuring the temperature of a thin-walled pipe, characterized in that The temperature of the thin-walled pipe is measured by using the device according to any one of claims 1-12, and it includes the following steps: S10: Place the device in a refrigerant for freezing; S20: Take out the frozen device from the refrigerant, and use a power component to place the device into the thin-walled pipe; S30: Measure the temperatures at different positions of the thin-walled pipe by using the optical fiber temperature sensor.

14. The method according to claim 13, wherein Before step S20, the following steps are further included: Heat the thin-walled pipe, and stop heating after the temperature of the thin-walled pipe is uniform.

Images