1. A measuring device for an inner wall of a pipe, comprising:

the clamping piece is used for fixing the measuring element, one end for fixing the measuring element can form an opening state under the action of external force, and can form a folding state after the external force is removed; and

and the control part is detachably connected with the clamping part to control the clamping part to form an open state, and the clamping part is positioned in the pipeline and can enable the measuring element to be abutted against the inner wall of the pipeline when the clamping part is in the open state.

2. The measuring device according to claim 1, wherein the holding member comprises an outer sleeve, the side wall of the outer sleeve is axially formed with at least one notch with one end open, one end of the outer sleeve is separated by the notch to form a blade, the blade is used for fixing the measuring element, and the control member can control the blade to expand outwards to form an open state.

3. A measuring device as claimed in claim 2, wherein the vane extends radially inwardly to form a boss, the control member abutting the boss to expand the vane radially outwardly into the open condition.

4. A measuring device according to claim 3, wherein the boss is formed with a first guide slope whose distance from the center of the outer sleeve becomes gradually smaller as approaching the end of the holder to which the measuring element is fixed.

5. The measuring device according to claim 2, wherein an end of the blade is formed with a mounting groove for allowing one end of the measuring element to be inserted into the mounting groove from an inner side of the outer sleeve and to be exposed to an outer side of the outer sleeve.

6. The measuring device of claim 2, wherein the side wall of the outer sleeve is uniformly formed with at least two of the gaps.

7. The measuring device according to any one of claims 1 to 6, wherein the control member is a control shaft having a through hole for passing through the measuring element, and one end of the control shaft abuts against the clamping member to open the clamping member.

8. The measuring device as claimed in claim 7, wherein one end of the control shaft is formed with a second guide slope whose distance from the center of the control shaft becomes gradually smaller as approaching the end of the holder where the measuring element is fixed.

9. The measuring device according to any one of claims 1 to 6, wherein a first mounting portion is formed at one end of the clamping member away from and fixed to the measuring element, a second mounting portion is formed at one end of the control member away from and fixed to the measuring element, and the clamping member and the control member are in threaded connection with the second mounting portion through the first mounting portion.

10. The measuring device as claimed in any one of claims 1 to 6, wherein the control member has a connecting head with a polygonal cross section, and the control member controls the holding member to be in the open state or the closed state by driving the connecting head.

Background

During the research there are many parameters of the inner wall of the pipe that need to be measured, such as temperature, pressure, etc. Taking the temperature measurement of the nuclear reactor fuel cladding as an example, in the process of researching a novel fuel element, the thermal resistance of the cladding and the cladding-pellet gap are important parameters, so that in the research stage, the values of the parameters are determined by a test measurement method, and the inner wall of the cladding needs to be measured. The temperature of the inner wall of the fuel cladding is required to be measured when the fuel element with the flow channel inside the cladding is subjected to a thermal performance test and a safety performance test. And steam flows in the cladding, so that the oxidation of the cladding tube in a high-temperature steam environment is researched, the temperature of the cladding tube is monitored in real time, a steam flow channel cannot be blocked while temperature measurement can be carried out, and steam can be fully oxidized with the inner wall of the cladding.

The fuel cladding is measured by a thermocouple in the most direct way. Due to the slender structure of the fuel cladding, the thermocouple is difficult to weld on the inner wall of the fuel cladding, and even if the thermocouple can be spot-welded on the inner wall of the fuel cladding, the thermocouple can not be firm and seriously influences the passage of a flow channel inside the cladding, and the problem that the measurement element is difficult to fix on the inner wall of a pipeline exists in the prior art.

Disclosure of Invention

In view of the above, embodiments of the present application provide a measuring device for an inner wall of a pipe to solve the problem that it is difficult to fix a measuring element on the inner wall of the pipe.

To achieve the above object, an embodiment of the present application provides a measuring device for an inner wall of a pipe, including:

the clamping piece is used for fixing the measuring element, one end for fixing the measuring element can form an opening state under the action of external force, and can form a folding state after the external force is removed; and

and the control part is detachably connected with the clamping part to control the clamping part to form an open state, and the clamping part is positioned in the pipeline and can enable the measuring element to be abutted against the inner wall of the pipeline when the clamping part is in the open state.

Further, the clamping piece comprises an outer sleeve, at least one notch with one end open is formed in the side wall of the outer sleeve along the axial direction, one end of the outer sleeve is separated by the notch to form a blade, the blade is used for fixing the measuring element, and the control piece can control the blade to expand outwards to form an open state.

Further, the vanes extend radially inwardly to form bosses, and the control member abuts the bosses to expand the vanes radially outwardly into an open state.

Further, the boss is formed with a first guide slope, and the distance between the first guide slope and the center of the outer sleeve pipe becomes gradually smaller as approaching to one end of the clamping piece for fixing the measuring element.

Furthermore, the end of the blade is formed with a mounting groove for allowing one end of the measuring element to pass through the mounting groove from the inner side of the outer sleeve and be exposed to the outer side of the outer sleeve.

Furthermore, the side wall of the outer sleeve is uniformly provided with at least two gaps.

Further, the control piece is a control shaft with a through hole, the through hole is used for penetrating the measuring element, and one end of the control shaft is abutted to the clamping piece, so that the clamping piece is in an open state.

Further, one end of the control shaft is formed with a second guide slope, and a distance between the second guide slope and the center of the control shaft becomes gradually smaller as approaching to the end of the clamping piece for fixing the measuring element.

Further, the holder is kept away from fixedly measuring element's one end forms first installation department, the control is kept away from the holder is fixed measuring element's one end is formed with the second installation department, the holder with the control passes through first installation department with second installation department threaded connection.

Furthermore, the control part is provided with a connecting head with a polygonal cross section, and the control part controls the clamping part to form an opening state or a folding state by driving the connecting head

The measuring device for the inner wall of the pipeline comprises a clamping piece and a control piece. The control piece is detachably connected with the clamping piece, the measuring element is fixed at one end of the clamping piece, one end, fixed with the measuring element, of the clamping piece can be in an open state under the action of the control piece, and a closed state can be formed after the acting force of the control piece on the clamping piece is removed. The control piece is used for controlling the clamping piece to form a furled state, the measuring device is placed on the inner wall of the pipeline to be measured, and then the control piece is operated to control the clamping piece to form an opened state, so that the measuring element is abutted against the inner wall of the pipeline to measure and fix the inner wall of the pipeline, the measuring element can be simply and conveniently placed on the inner wall of the pipeline to be measured without a welding mode, the process of welding the measuring element is omitted, and the operation difficulty of fixing the measuring element on the inner wall of the pipeline is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an outer sleeve of a measuring device according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of a clamp according to an embodiment of the present disclosure; and

fig. 5 is a schematic structural diagram of a control element according to an embodiment of the present application.

Description of reference numerals:

1. a clamping member; 11. an outer sleeve; 11a, a gap; 11b, mounting grooves; 111. a blade; 112. a boss; 113. a first guide slope; 12. a first mounting portion; 2. a control member; 21. a control shaft; 21a, a through hole; 22. a second guide slope; 23. a second mounting portion; 24. a connector; 3. a measuring element; 100. and (4) a measuring device.

Detailed Description

It should be noted that the various embodiments/implementations provided in this application can be combined with each other without contradiction. The detailed description in the specific embodiments should be understood as an illustration of the spirit of the application and not as an undue limitation of the application.

In the description of the present application, it is to be understood that such directional terms are merely used to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the application.

In the prior art, a temperature sensor or a thermocouple is used for measuring temperature, the measuring mode is simple and easy to operate, and only a measuring point of the temperature sensor or the thermocouple needs to be attached to the surface of a measured object. However, it is difficult to measure the temperature of the inner wall of the slender tube, and the major difficulty is that the inner diameter of the tube is small, and it is difficult to fix the thermocouple on the inner surface of the measured object. For example, in the prior art, a groove is milled on the outer wall, a thermocouple is embedded into the inner wall, alloy is sprayed on the outer wall, and finally the outer wall is welded by the alloy. This practice is complicated and destroys the integrity of the geometry of the object to be tested, which also affects the physical properties of the material.

The measuring device for the inner wall of the pipeline provided by the embodiment of the application is shown in the figures 1-5 and comprises a clamping piece 1 and a control piece 2. One end of the clamping piece 1 is used for fixing the measuring element 3, and the end for fixing the measuring element 3 can form an opening state under the action of external force and can form a closing state after the external force is removed; the control part 2 is detachably connected with the clamping part 1 so as to control the clamping part 1 to form an open state, and when the clamping part 1 is positioned in a pipeline and is in the open state, the measuring element 3 can be abutted against the inner wall of the pipeline.

The clamping piece is detachably connected with the clamping piece 1 through the control piece 2, the measuring element 3 is fixed at one end of the clamping piece 1, one end, fixed with the measuring element 3, of the clamping piece 1 can be in an open state under the action of the control piece 2, and a closed state can be formed after the acting force of the control piece 2 on the clamping piece 1 is removed. The control part 2 is used for controlling the clamping part 1 to form a furled state, the measuring device 100 is placed on the inner wall of the pipeline to be measured, the control part 2 is operated to control the clamping part 1 to form an opened state, so that the measuring element 3 is abutted against the inner wall of the pipeline to measure and fix the inner wall of the pipeline, the measuring element 3 can be simply placed on the inner wall of the pipeline to be measured without a welding mode, the process of welding the measuring element 3 is omitted, and the operation difficulty of fixing the measuring element 3 on the inner wall of the pipeline is reduced.

The utility model provides a pair of a measuring device for pipeline inner wall, the range of opening when opening through control holder 1 can be applicable to the pipeline of different internal diameter specifications, has the beneficial effect of universalization, resources are saved.

One end of the clamping piece 1, which is used for fixing the measuring element 3, can be in an open state under the action of the control piece 2, and can be in a closed state after the acting force of the control piece 2 on the clamping piece 1 is removed. The clamping piece 1 can be made of a material with certain elasticity, and is elastically deformed under the action of the control piece 2 to form an opening state, and after the acting force of the control piece 2 is removed, the clamping piece 1 restores to be elastically deformed under the action of the elastic force to form a folding state.

In an embodiment, referring to fig. 1, 2 and 4, the clamping member 1 includes an outer sleeve 11, a side wall of the outer sleeve 11 is axially formed with at least one notch 11a with an open end, one end of the outer sleeve 11 is separated by the notch 11a to form a blade 111, the blade 111 is used for fixing the measuring element 3, and the control member 2 can control the blade 111 to expand outwards to form an open state.

Referring to fig. 1, 2 and 4, one end of the outer sleeve 11 is separated by a gap 11a to form a blade 111, the formation of the gap 11a facilitates the deformation of the blade 111, and the blade 111 is used for fixing the measuring element 3. The control part 2 generates acting force on the blade 111, due to the existence of the gap 11a, the control part 2 controls the blade 111 to expand outwards to form an opening state, at the moment, the blade 111 deforms and contacts with the inner wall of the pipeline, and the measuring element 3 on the blade 111 contacts with the inner wall of the pipeline, so that parameters to be measured on the inner wall of the pipeline are measured.

The length of the notch 11a along the axial direction of the side wall of the outer sleeve 11 has a certain influence on the deformability of the blade 111, and the longer the length of the notch 11a along the axial direction of the side wall of the outer sleeve 11 is, the stronger the deformability is, but the strength of the blade 111 is reduced; the shorter the length of the notch 11a in the axial direction of the side wall of the outer tube 11, the weaker the deformability, but the strength of the blade 111 is relatively larger. The length of the gap 11a along the axial direction of the side wall of the outer sleeve 11 is determined by comprehensively considering the deformability and strength of the required blade 111.

In one embodiment, the end of the clamping member 1 without the opening 11a is an extension tube, the thickness of the blade 111 is smaller than that of the extension tube, the thickness of the blade 111 is smaller so that the blade 111 has sufficient deformability, and the thickness of the extension tube is larger so that the extension tube and the clamping member 1 have sufficient strength.

The number of the gaps 11a formed on the side wall of the outer sleeve 11 is at least one, i.e. 1, 2, 3 or more. When the number of the blades is 1, when the control member 2 exerts an acting force on the blades 111 of the clamping member 1, the blades 111 are deformed and expanded outwards. The number of the gaps 11a can be determined according to the number of the required fixed measuring elements 3, when a plurality of measuring elements 3 are required to be simultaneously carried out to realize multi-point measurement, a plurality of gaps 11a are formed to form a plurality of blades 111, and the measuring elements 3 are fixed by the blades 111 to carry out measurement. It will be appreciated that the length of the vanes 111 can be controlled to allow measurements to be taken at different depths in the inner wall of the pipe.

Specifically, at least two notches 11a are uniformly formed on the side wall of the outer sleeve 11. Because the gaps 11a are uniformly formed on the side wall of the outer sleeve 11, and the blades 111 are uniformly distributed at the same time, when the control part 2 generates acting force on the blades 111, the blades 111 can be uniformly expanded outwards, so that the measuring elements 3 on the blades 111 can be better abutted against the inner wall of the pipeline. For example, there are 3 slits 11a, and 3 slits 11a separate the outer tube 11 into 3 blades 111 with 120 ° arc.

In one embodiment, referring to fig. 2 and 3, the vane 111 extends radially inward to form a boss 112, and the control member 2 abuts against the boss 112 to expand the vane 111 radially outward to form the open state. The control member 2 contacts the boss 112 to generate an outward force on the boss 112, and presses the boss 112 outward, so that the vane 111 is expanded radially outward to form an open state. When the boss 112 is located at the end of the blade 111 close to the opening of the notch 11a, the expansion angle of the end of the blade 111 is relatively smaller than that of the end of the boss 112 located at the opening of the blade 111 far from the notch 11 a. It will be appreciated that the higher the height of the boss 112, the greater the angle of divergence of the ends of the vanes 111, all other factors being equal.

In one embodiment, referring to fig. 2 and 3, the boss 112 is formed with a first guiding slope 113, and the distance between the first guiding slope 113 and the center of the outer sleeve 11 becomes smaller as approaching the end of the clamping member 1 where the measuring element 3 is fixed. That is, the pipe diameter of the section of the outer sleeve 11 where the boss 112 is formed becomes gradually smaller as approaching the end of the clamping member 1 where the measuring element 3 is fixed, the control member 2 moves towards the end of the clamping member 1 where the measuring element 3 is fixed, so that the blades 111 gradually expand until the ends of the blades 111 tightly support the inner wall of the pipe. The first guiding inclined plane 113 is formed to facilitate the control member 2 to slowly control the opening angle of the blade 111 without suddenly opening a certain angle, so as to prevent the blade 111 from being damaged by the inner wall of the pipeline due to too large opening angle. On the other hand, the first guiding inclined surface 113 is provided to guide the control member 2, and prevent the control member 2 from being caught by the end of the boss 112, which may cause a failure in assembling the control member 2 with the clamping member 1. Meanwhile, the arrangement of the first guiding inclined plane 113 can make the measuring device 100 of the present application suitable for more pipelines with different pipe diameters.

In one embodiment, as shown in fig. 1 to 4, an installation groove 11b is formed at an end of the blade 111, and one end of the measuring element 3 is inserted into the installation groove 11b from the inner side of the outer sleeve 11 and exposed to the outer side of the outer sleeve 11. One end of the measuring element 3 is inserted into the mounting groove 11b from the inner side of the outer sleeve 11, and can be clamped in the mounting groove 11b by interference of the measuring element 3, or the measuring element 3 can be welded and fixed in the mounting groove 11 b. For example, the measuring device 100 is a device for measuring the temperature of the inner wall of a pipeline, the measuring element 3 is a thermocouple, and one end of the thermocouple is inserted into the mounting groove 11b from the inner side of the outer tube 11 and is welded and fixed in the mounting groove 11 b.

The measuring element 3 is fixed at the end part of the blade 111, a furled state is formed by controlling the acting force of the control part 2 and the boss 112 of the blade 111, or the blade 111 can not be abutted to an opening state of the inner wall of the pipeline when the blade is opened, the measuring element 3 is placed on the inner wall of the pipeline to be measured, the acting force is generated on the boss 112 of the blade 111 by the control part 2, and then the control part 2 is operated to control the blade 111 to be opened, because the measuring element 3 is fixed at the end part of the blade 111, the measuring element 3 can be firstly abutted to the inner wall of the pipeline, so that the measuring element 3 is abutted to the inner wall of the pipeline to measure and fix the inner wall of the pipeline, and the operation is simple and reliable.

In an embodiment, referring to fig. 1 and 5, the control member 2 is a control shaft 21 having a through hole 21a, the through hole 21a is used for penetrating the measuring element 3, and one end of the control shaft 21 abuts against the clamping member 1 to open the clamping member 1. The measuring element 3 is inserted through the through hole 21a of the control shaft 21 and then fixed at one end to one end of the holder 1. Then, one end of the control shaft 21 abuts against the clamp 1, and an acting force is generated on the clamp 1 to open the clamp 1, so that the measuring element 3 abuts against the inner wall of the pipe to measure and fix the inner wall of the pipe.

In one embodiment, referring to fig. 1, the control shaft 21 is located in the outer sleeve 11, and the measuring element 3 is inserted into the through hole 21a of the control shaft 21, inserted through the boss 112 of the blade 111, and welded and fixed in the mounting groove 11b at the end of the blade 111. When the control shaft 21 does not abut against the boss 112, the clamping member 1 is in a folded state, and the measuring device 100 is placed on the inner wall of the pipe to be measured. The control shaft 21 continues to move towards the boss 112, and when the control shaft 21 abuts against the boss 112 and applies force to the boss 112, the blades 111 start to expand outwards under the force of the control shaft 21 until the measuring elements 3 at the ends of the blades 111 abut against and are fixed on the inner wall of the pipeline. At this time, the other end of the measuring device 100 is fixed to the pipe, and the measurement can be started.

In one embodiment, referring to fig. 5, one end of the control shaft 21 is formed with a second guide slope 22, and the distance from the second guide slope 22 to the center of the control shaft 21 becomes gradually smaller as approaching one end of the clamping member 1, at which the measuring element 3 is fixed. That is, the pipe diameter of the section of the control shaft 21 where the second guiding inclined plane 22 is formed becomes gradually smaller as approaching the end of the clamping member 1 where the measuring element 3 is fixed, the control shaft 21 gradually expands the blades 111 as moving toward the end of the clamping member 1 where the measuring element 3 is fixed until the end of the blades 111 tightly supports the inner wall of the pipe. The second guiding inclined plane 22 is formed to facilitate the control shaft 21 to slowly control the opening angle of the blades 111, and the blades are not suddenly opened by a certain angle, so as to prevent the blades 111 from being damaged by the inner wall of the pipeline due to too large opening angle. On the other hand, the second guiding inclined surface 22 is provided to guide the control shaft 21, so as to prevent the control shaft 21 from being caught by the end of the boss 112, which may result in a failure in assembling the control shaft 21 with the holder 1. Meanwhile, the second guiding inclined surface 22 is provided, so that the measuring device 100 of the present application can be applied to more pipelines with different pipe diameters.

In one embodiment, the boss 112 is formed with a first guiding inclined surface 113, and the distance between the first guiding inclined surface 113 and the center of the outer sleeve 11 gradually decreases as approaching the end of the clamping member 1 for fixing the measuring element 3; one end of the control shaft 21 is formed with a second guide slope 22, and the distance from the center of the control shaft 21 to the second guide slope 22 becomes gradually smaller as it approaches the end of the holder 1 where the measuring element 3 is fixed. The first guide slope 113 is matched with the second guide slope 22, so that the control shaft 21 can better slowly control the opening angle of the blades 111.

In an embodiment, as shown in fig. 1, 4 and 5, a first mounting portion 12 is formed at an end of the clamping member 1 away from the fixed measuring element 3, a second mounting portion 23 is formed at an end of the control member 2 away from the clamping member 1 and fixed measuring element 3, and the clamping member 1 and the control member 2 are in threaded connection with the second mounting portion 23 through the first mounting portion 12. The clamping piece 1 is connected with one end of the control piece 2 through threads, so that the installation is simple, and sealing can be realized.

In one embodiment, the first mounting portion 12 is formed with an internal thread, and the second mounting portion 23 is formed with an external thread matching the internal thread of the first mounting portion 12, and since the control shaft 21 is inserted into the outer sleeve 11, the control shaft 21 is rotated to move the control shaft 21 toward the boss 112. When the control shaft 21 rotates to a certain position of the outer sleeve 11, the end of the control shaft 21 contacts the boss 112 of the blade 111 and applies force to the boss 112, so as to control the blade 111 to be in an open state, and since the measuring element 3 is fixed at the end of the blade 111, the measuring element 3 will be firstly abutted against the inner wall of the pipeline, so that the measuring element 3 is abutted against the inner wall of the pipeline to measure and fix the inner wall of the pipeline. The expansion angle of the blades 111 is controlled through the threaded fit between the outer sleeve 11 and the control shaft 21, and the operation is simple and flexible.

In one embodiment, referring to fig. 4, a first mounting portion 12 is formed at an end of the clamping member 1 away from the fixed measuring element 3, a second mounting portion 23 is formed at an end of the control member 2 away from the clamping member 1 and fixed measuring element 3, and the clamping member 1 and the control member 2 are in snap-fit connection through the first mounting portion 12 and the second mounting portion 23.

In one embodiment, referring to fig. 1 and 5, the control member 2 has a connecting head 24 with a polygonal cross section, and the control member 2 controls the clamping member 1 to be in the open state or the closed state by driving the connecting head 24. Since the hexagonal connection head 24 is formed at one end of the second installation part 23, the control member 2 can be easily driven by operating the connection head 24 with a wrench or other tools, so that the control member 2 controls the clamping member 1 to be in an open state, and the operation is convenient.

In an embodiment, the control element 2 further includes a T-shaped connector 24, the connector 24 is connected to the second mounting portion 23, and the control element 2 controls the clamping element 1 to be in the open state or the closed state by driving the connector 24. It is convenient to manually twist the connector 24 to actuate the control member 2.

When a cladding safety performance test is carried out, the inner diameter of a cladding pipe is generally 8.0mm, the length of the cladding pipe is generally 500mm, steam flows in the cladding pipe, the oxidation of the cladding pipe in a high-temperature steam environment is researched, the temperature of the cladding pipe is monitored in real time, a thermocouple is required to be arranged at the axial middle position, a steam flow channel cannot be blocked while temperature measurement can be carried out, and steam can be fully oxidized with the inner wall of the cladding.

Referring to fig. 1 to 5, for exemplifying temperature measurement of a nuclear reactor fuel cladding by using a thermocouple, a measuring device 100 aims to extend the thermocouple as a measuring element 3 into the cladding tube as a pipeline, a blade 111 is opened under the action of a control shaft 21 so that the thermocouple is tightly abutted against the inner wall of the cladding tube, at this time, a first mounting portion 12 of an outer sleeve 11 is located at an end of the cladding tube, and the cladding tube is hermetically connected with the first mounting portion 12 of the outer sleeve 11 by using a ferrule, so that steam is sealed in the cladding tube. The thermocouple clamping device comprises a clamping piece 1 and a control piece 2, wherein one end of a control shaft 21 is of an external thread structure, the other end of the control shaft is milled into a conical surface to form a second guide inclined surface 22, and a through hole 21a is formed in the center of the control shaft 21 and used for penetrating a thermocouple; the outer sleeve 11 is composed of a blade 111, an extension pipe and a first mounting part 12, wherein one end of the outer sleeve 11 is provided with 3 notches 11a along the axial direction to form 3 blades 111 with a central angle of 120 degrees, the end part of each blade 111 is provided with a mounting groove 11b for welding and fixing a thermocouple, the inner side of each blade 111 is provided with a boss 112, a first guide inclined plane 113 is formed on each boss 112, the distance between each first guide inclined plane 113 and the center of the outer sleeve 11 is gradually reduced along with the end close to the clamping piece 1 for fixing the measuring element 3, namely, the pipe diameter of the section of the outer sleeve 11 where the boss 112 is formed is gradually reduced along with the end close to the clamping piece 1 for fixing the measuring element 3.

When the temperature is measured, only the control shaft 21 is inserted into the outer sleeve 11, the first mounting part 12 of the outer sleeve 11 is an internal thread, the bolt at the end part of the control shaft 21 is screwed, one end of the control shaft 21 forming the second guide inclined plane 22 faces the boss 112, when the control shaft is contacted with the boss 112, 3 blades 111 extruding the outer sleeve 11 are gradually opened due to the gradual reduction of the pipe diameter until the control shaft is tightly supported in the cladding pipe, and the end part of the thermocouple also fixes the inner wall of the cladding pipe, so that the purpose of measuring the temperature of the inner wall of the cladding pipe is achieved. If a plurality of thermocouples are fixed to measure circumferential and axial temperatures, the multipoint temperature measurement can be realized only by adjusting the height of the blade 111 or the number of the blade 111 mounting grooves 11 b. The measuring device 100 for the inner wall of the pipeline, provided by the embodiment of the application, is simple in structure, convenient to seal, flexible to operate, free of customization, low in cost, capable of achieving multi-scene application, capable of being used for pipelines with different inner diameter specifications, convenient to operate, capable of solving the key technical core problem of temperature measurement in an experiment and capable of guaranteeing smooth implementation of the experiment.

The size of the blade 111 is not limited, the structure is not limited to an arc, and the blade may be in a sheet shape, a square shape or other forms, and may be generalized to measure any parameter such as pressure and deformation of the inner surface of a pipe or any object.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.