Temperature measuring device for pipeline with small pipe diameter

Abstract

The invention relates to the technical field of pipeline fluid temperature measurement, and discloses a small-diameter pipeline temperature measuring device which comprises a main body, a boss is fixedly connected to the top of the main body and communicates with the main body, a rectangular groove is formed in the boss, the side wall of the rectangular groove is open, and a threaded sleeve is fixedly connected to the inner wall of the top of the boss. A plurality of square grooves are formed in the side wall of the threaded sleeve, and a plurality of triangular plates are fixedly connected to the inner wall of the boss. When the temperature measuring device is used on site, only the main body needs to be assembled with the temperature measuring mechanism through the boss, any machining operation is not needed in the assembling process, operation is very convenient, and the reliability of the structure can be guaranteed; in addition, the pipeline diameter of the device is consistent with that of a temperature measurement object pipeline, so that the reducing of the pipeline is eliminated, and the problem of pipeline vibration caused by flowing of fluid in the reducing pipeline can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline fluid temperature measurement, in particular to a pipeline temperature measurement device with a small pipe diameter. Background Art

[0002] At present, in the fields of natural gas extraction and petrochemical industry, it is necessary to measure the temperature of fluid media in various pipelines. The commonly used temperature measurement method is to drill a hole in the pipeline and then insert the temperature measuring head into the pipeline for measurement. However, in actual application, this method is limited by the radial size of the pipeline, which brings some problems.

[0003] Specifically, when measuring the temperature of a pipe smaller than DN100, the pipe needs to be expanded to DN100. When measuring the temperature of a tiny pipe diameter below DN25, the pipe diameter of DN25 and below needs to be expanded by 4 levels or more to DN100. Only in this way can the size conditions for assembling the temperature measuring device on site be met. However, too many pipe diameter expansion levels can easily cause pipe vibration. Therefore, for small-diameter pipes, the temperature is generally measured on the surface of the pipe or not measured. The pipe surface temperature measurement method is inaccurate and the measured temperature value has a delay. Obviously, not measuring the temperature cannot meet the process requirements in some cases. Expanding the small-diameter pipe on site and setting the corresponding temperature measuring elements will involve the processing of the pipe and the corresponding components, including necessary cutting and welding. However, the on-site processing conditions are relatively simple and the processing quality is prone to human defects. Summary of the invention

[0004] The purpose of the present invention is to provide a temperature measuring device for a pipeline with a small diameter to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a temperature measuring device for a small-diameter pipeline, comprising a main body, a boss fixedly connected to the top of the main body, the boss and the main body are connected, a rectangular groove is provided inside the boss, the side wall of the rectangular groove is open, a threaded sleeve is fixedly connected to the inner wall of the top of the boss, a plurality of square grooves are provided on the side wall of the threaded sleeve, a plurality of triangular plates are fixedly connected to the inner wall of the boss, and further comprising;

[0007] The sealing mechanism includes a plurality of springs fixedly connected to the inner wall of the top of the boss, the springs are located between the boss and the threaded sleeve, one end of the plurality of springs close to the main body is fixedly connected to a moving ring, and the end of the moving ring away from the threaded sleeve is fixedly connected to a C-shaped plate;

[0008] The rotating mechanism includes three arc-shaped plates fixedly connected to the inner wall of the bottom of the boss, the left and right sides of the arc-shaped plates are rotatably connected to connecting plates, a connecting rod is rotatably connected between the two connecting plates, a semicircular plate is fixedly connected to the central axis of the connecting rod, and a flexible ring is rotatably connected to the side of the three semicircular plates away from the connecting rod.

[0009] Furthermore, the middle part of the C-shaped plate is slidably connected to the bottom side wall of the threaded sleeve, and the side wall of the movable ring is provided with a flexible ball chain, which is slidably connected to the inside of a plurality of square grooves.

[0010] Furthermore, one side of the connecting plate away from the arc plate is rotatably connected to the limiting plate, one end of a plurality of limiting plates away from the connecting plate is slidably connected to a rubber ring, and the side wall of the semicircular plate is in contact with the triangular plate.

[0011] Furthermore, a pushing mechanism is provided on the side wall of the arc plate, and the pushing mechanism includes a spring shaft fixedly connected to the side of the arc plate close to the rubber ring, a sliding sleeve is slidably connected to the outer surface of the spring shaft, a swing plate is rotatably connected to the side of the sliding sleeve close to the connecting plate, a side of the swing plate away from the sliding sleeve is fixedly connected to the side wall of the arc plate, and a semicircular plate 2 is fixedly connected to the side of the sliding sleeve away from the arc plate.

[0012] Furthermore, the inside of the boss is provided with a rod whose end close to the main body penetrates the top outer wall of the rectangular groove and extends to the inside, and several positioning rod moving mechanisms, the moving mechanisms include several positioning rods slidably connected to the inside of the boss, and several positioning tops are in contact with the bottom outer wall of the C-shaped plate.

[0013] Furthermore, several extending ends of the positioning rods are fixedly connected with an annular plate, several return springs are fixedly connected between the annular plate and the top inner wall of the rectangular groove, several hollow plates are fixedly connected with the side of the annular plate away from the positioning rod, and the several hollow plates are symmetrically arranged in groups of two, and each group of hollow plates is arranged in a circular array with the middle of the annular plate as the center, and two rotating plates are rotatably connected between the two hollow plates, and the two rotating plates are rotatably connected with a trapezoidal block on the side away from the hollow plates, and the side of the trapezoidal block away from the hollow plate is made of flexible material, and the trapezoidal block is slidably connected at the opening of the rectangular groove.

[0014] Furthermore, a temperature measuring mechanism is arranged inside the boss, and the temperature measuring mechanism comprises a connector threadedly connected inside the threaded sleeve, and a protective sleeve is fixedly connected to the bottom of the connector.

[0015] Furthermore, the protective sleeve penetrates the inner wall of the main body and extends to the interior, the internal thread of the connecting head is connected to the temperature measuring head, and the bottom of the temperature measuring head penetrates into the interior of the connecting head.

[0016] The present invention has the following beneficial effects:

[0017] 1. In the present invention, the main body of the preferred temperature measuring device can be prepared in advance, that is, the main body of the temperature measuring device can be processed in a corresponding pipeline processing plant. The main body can be directly cut from a pipe fitting with the same specification as the temperature measuring object pipeline. The remaining structures and the combination of the structures can ensure the processing quality in a factory with complete processing conditions. When used on site, it is only necessary to assemble the main body with the temperature measuring mechanism through the boss. No processing operation is required during the assembly process, the operation is very convenient, and the reliability of the structure can be guaranteed. In addition, the pipeline diameter of the device is consistent with the temperature measuring object pipeline, thereby eliminating the diameter change of the pipeline, and avoiding the pipeline vibration problem caused by the flow of fluid in the diameter-changing pipeline.

[0018] 2. In the present invention, when the temperature measuring mechanism is assembled with the main body, the protective sleeve is first passed through the boss to reach the inside of the main body, and then the connecting head is screwed to engage the connecting head with the threaded sleeve. Then, during the screwing process, the connecting head will drive the protective sleeve to move downward. When the connecting head pushes the protective sleeve to move downward, the front end of the protective sleeve moving downward will first squeeze the flexible ring. After being squeezed, the flexible ring will expand outward and push the top of the semicircular plate to rotate it. When the semicircular plate rotates, the semicircular plate will rotate on the side wall of the triangular plate. When the semicircular plate rotates, the rotating semicircular plate will push the arc plate through the connecting rod to move it forward. At the same time, when the connecting rod pushes the arc plate to move, the arc plate will be pushed by the connecting rod and deformed. At this time, the deformed connecting plate The middle part of the connecting rod will bulge backward. When the arc plate is deformed, the deformed arc plate will push the limit plate to move through the connecting plate. When the limit plate moves, it will push the rubber ring to make the rubber ring fit against the outer surface of the protective sleeve. Then, when the protective sleeve is deformed, the deformed arc plate will push the sliding sleeve to slide forward on the surface of the spring shaft through the swing plate. When the sliding sleeve slides, it will squeeze the rubber ring on the surface of the protective sleeve through the semicircular plate. When the protective sleeve squeezes the flexible ring to push the semicircular plate to expand, the flexible ring and the rubber ring will keep close fit on the surface of the protective sleeve. Through the expansion and contraction of the flexible ring and the rubber ring, there is no need to expand the diameter of the main pipe when the small diameter pipe measuring component is used, saving project costs.

[0019] 3. According to the present invention, when the connector is screwed to be assembled with the main body, the connector will squeeze the C-shaped plate during the screwing process, and the C-shaped plate will drive the moving ring to move downward after being squeezed, and when the moving ring moves down to the side wall of the square groove, the inner wall of the moving ring will squeeze the flexible ball chain during the downward movement, and the flexible ball chain will fit tightly between the connector and the threaded sleeve after being squeezed, and the threaded sleeve and the square groove can be sealed by the squeezing of the flexible ball chain. At the same time, when the flexible ball chain is squeezed on the outer surface of the connector, since the flexible ball chain is flexible, when the flexible ball chain is squeezed, the loosening of the threaded structure between the connector and the threaded sleeve can be reduced, thereby playing a role in preventing loosening, and the sealing of the flexible ball chain can prevent fluid leakage, reduce the situation where poor sealing affects the measurement results, and improve the measurement efficiency.

[0020] 4. According to the present invention, when the C-shaped plate moves downward, the moving C-shaped plate will squeeze the positioning rod, and the positioning rod will push the annular plate downward after being squeezed, and the annular plate will drive the trapezoidal block to move downward through the hollow plate and the rotating plate when moving downward, and when the trapezoidal block moves down to contact the bottom inner wall of the rectangular groove, the annular plate that continues to move downward will squeeze the rotating plate through the hollow plate, and the rotating plate will push the trapezoidal block after being squeezed, so that the trapezoidal block extends out of the opening of the rectangular groove and fits on the inner wall of the protective sleeve, and when the C-shaped plate moves to the bottom, the trapezoidal block will just cover the surface of the protective sleeve, thereby ensuring the specific radial position of the protective sleeve inside the main body, ensuring the accuracy and stability of the position of the protective sleeve inside the main body, and ensuring the sensitivity of the temperature element measurement.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view of point C in the middle;

[0026] Figure 4 It is a schematic diagram of the main structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the sealing mechanism structure of the present invention;

[0028] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 It is a schematic diagram of the structure of the rotating mechanism of the present invention;

[0030] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0031] Fig. 9 It is a schematic diagram of the structure of the mobile mechanism of the present invention.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] In the figure: 1. main body; 101. boss; 102. rectangular groove; 103. threaded sleeve; 104. square groove; 105. triangular plate; 2. sealing mechanism; 201. moving ring; 202. C-shaped plate; 203. spring; 204. flexible ball chain; 3. rotating mechanism; 301. arc plate; 302. connecting plate; 303. connecting rod; 304. semicircular plate; 305. flexible ring; 306. limit plate; 307. rubber ring; 4. pushing mechanism; 401. spring shaft; 402. sliding sleeve; 403. swing plate; 404. semicircular plate II; 5. moving mechanism; 501. positioning rod; 502. annular plate; 503. hollow plate; 504. rotating plate; 505. trapezoidal block; 6. temperature measuring mechanism; 601. protective sleeve; 602. connector; 603. temperature measuring head. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 9 As shown, the present invention is a small-diameter pipeline temperature measuring device, including a main body 1, a boss 101 is fixedly connected to the top of the main body 1, the boss 101 is connected to the main body 1, a rectangular groove 102 is provided inside the boss 101, the side wall of the rectangular groove 102 is open, a threaded sleeve 103 is fixedly connected to the top inner wall of the boss 101, a plurality of square grooves 104 are provided on the side wall of the threaded sleeve 103, a plurality of triangular plates 105 are fixedly connected to the inner wall of the boss 101, and further comprising;

[0036] The sealing mechanism 2 includes a plurality of springs 203 fixedly connected to the inner wall of the top of the boss 101, the springs 203 are located between the boss 101 and the threaded sleeve 103, one end of the plurality of springs 203 close to the main body 1 is fixedly connected to a moving ring 201, and the moving ring 201 away from the threaded sleeve 103 is fixedly connected to a C-shaped plate 202;

[0037] The rotating mechanism 3 includes three arc-shaped plates 301 fixedly connected to the inner wall at the bottom of the boss 101, the left and right sides of the arc-shaped plates 301 are rotatably connected with connecting plates 302, a connecting rod 303 is rotatably connected between the two connecting plates 302, a semicircular plate 304 is fixedly connected to the central axis of the connecting rod 303, and the three semicircular plates 304 are rotatably connected to the side away from the connecting rod 303 with a flexible ring 305, and the C-shaped plate 202 will drive the moving ring 201 to move downward after being squeezed, and when the moving ring 201 moves down to the side wall of the square groove 104, the inner wall of the moving ring 201 will squeeze the flexible ball chain 204 during the downward movement, and the flexible ball chain 204 will fit tightly between the connector 602 and the threaded sleeve 103 after being squeezed.

[0038] The middle part of the C-shaped plate 202 is slidably connected to the bottom side wall of the threaded sleeve 103, and the side wall of the movable ring 201 is provided with a flexible ball chain 204, which is slidably connected to the inside of several square grooves 104. The flexible ball chain 204 can be squeezed to seal the threaded sleeve 103 and the square groove 104.

[0039] The connecting plate 302 is rotatably connected to the limiting plate 306 on one side away from the arc plate 301. The end of several limiting plates 306 away from the connecting plate 302 is slidably connected with a rubber ring 307. The side wall of the semicircular plate 304 is in contact with the triangular plate 105. After being squeezed, the flexible ring 305 will expand outward and push the top of the semicircular plate 304 to rotate. When the semicircular plate 304 rotates, the semicircular plate 304 will rotate on the side wall of the triangular plate 105. When the semicircular plate 304 rotates, the rotating semicircular plate 304 will push the arc plate 301 through the connecting rod 303 to move it forward.

[0040] The side wall of the arc plate 301 is provided with a pushing mechanism 4, which includes a spring shaft 401 fixedly connected to the side of the arc plate 301 close to the rubber ring 307, the outer surface of the spring shaft 401 is slidably connected to a sliding sleeve 402, the side of the sliding sleeve 402 close to the connecting plate 302 is rotatably connected to a swing plate 403, the side of the swing plate 403 away from the sliding sleeve 402 is fixedly connected to the side wall of the arc plate 301, the side of the sliding sleeve 402 away from the arc plate 301 is fixedly connected to a semicircular plate 2 404, and when the sliding sleeve 402 slides, the rubber ring 307 on the surface of the protective sleeve 601 is squeezed through the semicircular plate 2 404.

[0041] A moving mechanism 5 is provided inside the boss 101, and the moving mechanism 5 includes a plurality of positioning rods 501 slidably connected inside the boss 101, and one end of the plurality of positioning rods 501 close to the main body 1 penetrates through the top outer wall of the rectangular groove 102 and extends to the inside, and the tops of the plurality of positioning rods 501 contact the bottom outer wall of the C-shaped plate 202. When the C-shaped plate 202 moves downward, the moving C-shaped plate 202 will squeeze the positioning rods 501, and the positioning rods 501 will push the annular plate 502 to move downward after being squeezed, and when the annular plate 502 moves downward, it will drive the trapezoidal block 505 to move downward through the hollow plate 503 and the rotating plate 504.

[0042] The extended ends of the plurality of positioning rods 501 are fixedly connected with an annular plate 502, and a plurality of return springs are fixedly connected between the annular plate 502 and the top inner wall of the rectangular groove 102. A plurality of hollow plates 503 are fixedly connected to the side of the annular plate 502 away from the positioning rod 501. The plurality of hollow plates 503 are symmetrically arranged in groups of two, and each group of hollow plates 503 is arranged in a circular array with the middle of the annular plate 502 as the center. Two rotating plates 504 are rotatably connected between the two hollow plates 503. The two rotating plates 504 are rotatably connected to the two hollow plates 503. The side away from the hollow plate 503 is rotatably connected with a trapezoidal block 505, the side of the trapezoidal block 505 away from the hollow plate 503 is made of flexible material, and the trapezoidal block 505 is slidably connected to the opening of the rectangular groove 102. When the trapezoidal block 505 moves down to contact the bottom inner wall of the rectangular groove 102, the annular plate 502 that continues to move down will squeeze the rotating plate 504 through the hollow plate 503, and the rotating plate 504 will push the trapezoidal block 505 after being squeezed, so that the trapezoidal block 505 extends out of the opening of the rectangular groove 102.

[0043] A temperature measuring mechanism 6 is arranged inside the boss 101, and the temperature measuring mechanism 6 includes a connector 602 threadedly connected to the inside of the threaded sleeve 103, and a protective sleeve 601 is fixedly connected to the bottom of the connector 602. When the temperature measuring mechanism 6 is assembled with the main body 1, the protective sleeve 601 is first passed through the boss 101 to reach the inside of the main body 1, and then the connector 602 is screwed to make the connector 602 engage with the threaded sleeve 103. Then, during the screwing process, the connector 602 will drive the protective sleeve 601 to move downward. When the connector 602 pushes the protective sleeve 601 to move downward, the front end of the protective sleeve 601 moving downward will first squeeze the flexible ring 305.

[0044] The protective sleeve 601 penetrates the inner wall of the main body 1 and extends to the inside. The internal thread of the connecting head 602 is connected to the temperature measuring head 603. The bottom of the temperature measuring head 603 penetrates into the inside of the connecting head 602. When the protective sleeve 601 squeezes the flexible ring 305 to push the semicircular plate 304 to expand, the flexible ring 305 and the rubber ring 307 will maintain a tight fit on the surface of the protective sleeve 601.

[0045] When in use, the main body of the preferred temperature measuring device can be prepared in advance, that is, the main body of the temperature measuring device can be processed in a corresponding pipeline processing plant. The main body 1 can be directly cut from a pipe fitting with the same specification as the temperature measuring object pipeline. The remaining structures and the combination of structures can ensure the processing quality in a factory with complete processing conditions. When used on site, it is only necessary to assemble the main body 1 with the temperature measuring mechanism 6 through the boss 101. No processing operation is required during the assembly process. The operation is very convenient and the reliability of the structure can be guaranteed. In addition, the pipeline diameter of the device is consistent with the pipeline of the temperature measuring object, thereby eliminating the diameter change of the pipeline and avoiding the pipeline vibration problem caused by the flow of fluid in the variable diameter pipeline.

[0046] When the temperature measuring mechanism 6 is assembled with the main body 1, the protective sleeve 601 is first passed through the boss 101 to reach the inside of the main body 1, and then the connector 602 is screwed to engage the connector 602 with the threaded sleeve 103. Then, during the screwing process, the connector 602 will drive the protective sleeve 601 to move downward. When the connector 602 pushes the protective sleeve 601 to move downward, the front end of the protective sleeve 601 moving downward will first squeeze the flexible ring 305, and the flexible ring 305 will be squeezed. After that, it will expand outward and push the top of the semicircular plate 304 to rotate. When the semicircular plate 304 rotates, the semicircular plate 304 will rotate on the side wall of the triangular plate 105. When the semicircular plate 304 rotates, the rotating semicircular plate 304 will push the arc plate 301 forward through the connecting rod 303 to make it move forward. At the same time, when the connecting rod 303 pushes the arc plate 301 to move, the arc plate 301 will be pushed by the connecting rod 303 and deformed. At this time, the deformed connecting rod 303 The middle part thereof will bulge backwards. When the arc plate 301 is deformed, the deformed arc plate 301 will push the limit plate 306 to move through the connecting plate 302. When the limit plate 306 moves, it will push the rubber ring 307, so that the rubber ring 307 fits the outer surface of the protective sleeve 601. Then, when the protective sleeve 601 is deformed, the deformed arc plate 301 will push the sliding sleeve 402 to slide forward on the surface of the spring shaft 401 through the swing plate 403. When 402 slides, it will squeeze the rubber ring 307 on the surface of the protective sleeve 601 through the semicircular plate 2 404. When the protective sleeve 601 squeezes the flexible ring 305 to push the semicircular plate 304 to expand, the flexible ring 305 and the rubber ring 307 will keep close contact on the surface of the protective sleeve 601. Through the expansion and contraction of the flexible ring 305 and the rubber ring 307, there is no need to expand the pipe of the main body 1 when the micro-diameter pipe measuring component is used, saving project costs.

[0047] When the connector 602 is screwed to be assembled with the main body 1, the connector 602 will squeeze the C-shaped plate 202 during the screwing process, and the C-shaped plate 202 will drive the moving ring 201 to move downward. When the moving ring 201 moves down to the side wall of the square groove 104, the inner wall of the moving ring 201 will squeeze the flexible ball chain 204 during the downward movement, and the flexible ball chain 204 will fit tightly between the connector 602 and the threaded sleeve 103 through the flexible ball chain 204. The extrusion can seal the threaded sleeve 103 and the square groove 104. At the same time, when the flexible ball chain 204 is squeezed on the outer surface of the connector 602, due to the flexibility of the flexible ball chain 204, when the flexible ball chain 204 is squeezed, the loosening of the threaded structure between the connector 602 and the threaded sleeve 103 can be reduced, thereby preventing loosening. Through the sealing of the flexible ball chain 204, fluid leakage can be prevented, the occurrence of poor sealing and the influence of measurement results can be reduced, and the measurement efficiency can be improved.

[0048] When the C-shaped plate 202 moves downward, the moving C-shaped plate 202 will squeeze the positioning rod 501, and the positioning rod 501 will push the annular plate 502 downward after being squeezed. When the annular plate 502 moves downward, it will drive the trapezoidal block 505 to move downward through the hollow plate 503 and the rotating plate 504. When the trapezoidal block 505 moves downward to contact the bottom inner wall of the rectangular groove 102, the annular plate 502 that continues to move downward will squeeze the rotating plate 504 through the hollow plate 503, and the rotating plate 504 After being squeezed, the trapezoidal block 505 will be pushed, so that the trapezoidal block 505 extends out of the opening of the rectangular groove 102 and fits against the inner wall of the protective sleeve 601. When the C-shaped plate 202 moves to the bottom, the trapezoidal block 505 will just cover the surface of the protective sleeve 601, ensuring the specific radial position of the protective sleeve 601 inside the main body 1, ensuring the accuracy and stability of the position of the protective sleeve 601 inside the main body 1, and ensuring the sensitivity of the temperature element measurement.

[0049] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A temperature measuring device for a pipeline with a small diameter, comprising a main body (1), a boss (101) fixedly connected to the top of the main body (1), the boss (101) being connected to the main body (1), a rectangular groove (102) being provided inside the boss (101), the side wall of the rectangular groove (102) being open, a threaded sleeve (103) being fixedly connected to the inner wall of the top of the boss (101), a plurality of square grooves (104) being provided on the side wall of the threaded sleeve (103), and a plurality of triangular plates (105) being fixedly connected to the inner wall of the boss (101), It is characterized in that Also includes; A sealing mechanism (2), the sealing mechanism (2) comprising a plurality of springs (203) fixedly connected to the inner wall of the top of the boss (101), the springs (203) being located between the boss (101) and the threaded sleeve (103), the ends of the plurality of springs (203) close to the main body (1) being fixedly connected to a moving ring (201), and the ends of the moving rings (201) away from the threaded sleeve (103) being fixedly connected to a C-shaped plate (202); A rotating mechanism (3), the rotating mechanism (3) comprising three arc-shaped plates (301) fixedly connected to the inner wall of the bottom of the boss (101), the left and right sides of the arc-shaped plates (301) being rotatably connected to connecting plates (302), a connecting rod (303) being rotatably connected between the two connecting plates (302), a semicircular plate (304) being fixedly connected to the central axis of the connecting rod (303), and a flexible ring (305) being rotatably connected to the side of the three semicircular plates (304) away from the connecting rod (303).

2. A small diameter pipeline temperature measuring device according to claim 1, Features: The middle part of the C-shaped plate (202) is slidably connected to the bottom side wall of the threaded sleeve (103), and the side wall of the movable ring (201) is provided with a flexible ball chain (204), and the flexible ball chain (204) is slidably connected to the inside of a plurality of the square grooves (104).

3. A small diameter pipeline temperature measuring device according to claim 2, Features: The side of the connecting plate (302) away from the arc plate (301) is rotatably connected to the limiting plate (306), and one end of a plurality of the limiting plates (306) away from the connecting plate (302) is slidably connected to a rubber ring (307), and the side wall of the semicircular plate (304) is in contact with the triangular plate (105).

4. A small diameter pipeline temperature measuring device according to claim 3, Features: The side wall of the arc-shaped plate (301) is provided with a pushing mechanism (4), and the pushing mechanism (4) comprises a spring shaft (401) fixedly connected to a side of the arc-shaped plate (301) close to the rubber ring (307); a sliding sleeve (402) is slidably connected to the outer surface of the spring shaft (401); a side of the sliding sleeve (402) close to the connecting plate (302) is rotatably connected to a swing plate (403); a side of the swing plate (403) away from the sliding sleeve (402) is fixedly connected to the side wall of the arc-shaped plate (301); and a side of the sliding sleeve (402) away from the arc-shaped plate (301) is fixedly connected to a second semicircular plate (404).

5. A small diameter pipeline temperature measuring device according to claim 4, Features: A moving mechanism (5) is arranged inside the boss (101), and the moving mechanism (5) comprises a plurality of positioning rods (501) slidably connected inside the boss (101), and one end of the plurality of positioning rods (501) close to the main body (1) penetrates through the top outer wall of the rectangular groove (102) and extends to the inside, and the tops of the plurality of positioning rods (501) are in contact with the bottom outer wall of the C-shaped plate (202).

6. A small diameter pipeline temperature measuring device according to claim 5, Features: The extending ends of several positioning rods (501) are fixedly connected with an annular plate (502), and several return springs are fixedly connected between the annular plate (502) and the top inner wall of the rectangular groove (102). The side of the annular plate (502) away from the positioning rod (501) is fixedly connected with several hollow plates (503), and the several hollow plates (503) are symmetrically arranged in groups of two, and each group of hollow plates (503) is arranged in a circular array with the middle part of the annular plate (502) as the center. Two rotating plates (504) are rotatably connected between two hollow plates (503), and the two rotating plates (504) are rotatably connected with a trapezoidal block (505) on the side away from the hollow plate (503), and the side of the trapezoidal block (505) away from the hollow plate (503) is made of flexible material, and the trapezoidal block (505) is slidably connected to the opening of the rectangular groove (102).

7. A small-diameter pipeline temperature measuring device according to claim 6, Features: A temperature measuring mechanism (6) is arranged inside the boss (101), and the temperature measuring mechanism (6) comprises a connector (602) threadedly connected inside the threaded sleeve (103), and a protective sleeve (601) is fixedly connected to the bottom of the connector (602).

8. A small diameter pipeline temperature measuring device according to claim 7, Features: The protective sleeve (601) penetrates the inner wall of the main body (1) and extends into the interior; the internal thread of the connecting head (602) is connected to a temperature measuring head (603); and the bottom of the temperature measuring head (603) penetrates into the interior of the connecting head (602).

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