A small-diameter pipe temperature measuring device

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of pipeline fluid temperature measurement technology, specifically to a small-diameter pipeline temperature measurement device. Background Technology

[0002] Currently, in the fields of natural gas extraction and petrochemicals, it is necessary to measure the temperature of fluid media in various pipelines. The common method of temperature measurement is to drill holes in the pipeline and then insert a temperature measuring head into the pipeline for measurement. However, in actual applications, this method is limited by the radial dimensions of the pipeline, which leads to some problems.

[0003] Specifically, when measuring the temperature of pipes smaller than DN100, the pipe needs to be enlarged to DN100. For temperature measurement of micro-diameter pipes below DN25, pipes of DN25 and below need to be enlarged by 4 or more stages to meet the dimensional requirements for on-site assembly of the temperature measuring device. However, too many stages of pipe enlargement can easily cause pipe vibration. Therefore, for small-diameter pipes, temperature is generally measured on the pipe surface or not at all. However, surface temperature measurement is inaccurate and the measured temperature value is delayed. Not measuring the temperature obviously cannot meet the process requirements in some cases. Enlarging the diameter of small-diameter pipes and installing corresponding temperature measuring elements on-site involves processing the pipe and related components, including necessary cutting and welding. However, the on-site processing conditions are relatively rudimentary, and the processing quality is very prone to human defects. Summary of the Invention

[0004] The purpose of this invention is to provide a small-diameter pipe temperature measuring device to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

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

[0007] The sealing mechanism includes several springs fixedly connected to the inner wall of the top of the boss. The springs are located between the boss and the threaded sleeve. A movable ring is fixedly connected to one end of the several springs near the main body. A C-shaped plate is fixedly connected to the movable ring away from the threaded sleeve.

[0008] The rotating mechanism includes three arc-shaped plates fixedly connected to the inner wall of the bottom of the boss. Connecting plates are rotatably connected to the left and right sides of the arc-shaped plates. A connecting rod is rotatably connected between two connecting plates. A semi-circular plate is fixedly connected to the central axis of the connecting rod. A flexible ring is rotatably connected to the side of the three semi-circular 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 moving ring is provided with a flexible ball chain, which is slidably connected inside several square grooves.

[0010] Furthermore, a limiting plate is rotatably connected to the side of the connecting plate away from the arc plate, and several limiting plates are slidably connected to rubber rings at the ends away from the connecting plate, with the sidewall of the semicircular plate in contact with the triangular plate.

[0011] Furthermore, a pushing mechanism is provided on the side wall of the arc-shaped plate. The pushing mechanism includes a spring shaft fixedly connected to the side of the arc-shaped plate near 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 near the connecting plate. The side of the swing plate away from the sliding sleeve is fixedly connected to the side wall of the arc-shaped plate. A semi-circular plate is fixedly connected to the side of the sliding sleeve away from the arc-shaped plate.

[0012] Furthermore, the interior of the boss is provided with a rod that extends through the top outer wall of the rectangular groove and into the interior, with one end near the main body. Several positioning rod moving mechanisms are provided, including several positioning rods that are slidably connected inside the boss, with the top of several positioning rods contacting the bottom outer wall of the C-shaped plate.

[0013] Furthermore, several positioning rods have annular plates fixedly connected to their extended ends. Several return springs are fixedly connected between the annular plates and the inner top wall of the rectangular groove. Several hollow plates are fixedly connected to the side of the annular plates away from the positioning rods. The hollow plates are arranged symmetrically in pairs. Each group of hollow plates is arranged in a circumferential array with the center of the annular plate as the center. Two rotating plates are rotatably connected between two hollow plates. Trapezoidal blocks are rotatably connected to the side of the two rotating plates away from the hollow plates. The side of the trapezoidal blocks away from the hollow plates is made of flexible material. The trapezoidal blocks are slidably connected to the opening of the rectangular groove.

[0014] Furthermore, a temperature measuring mechanism is provided inside the boss, which includes a connector threaded 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 into the interior, and the internal thread of the connector is connected to a temperature measuring head, the bottom of which penetrates into the interior of the connector.

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

[0017] 1. In this invention, the main body of the temperature measuring device can be prepared in advance, that is, it can be processed in a corresponding pipe processing plant. The main body can be directly cut from a pipe fitting with the same specifications as the pipe to be measured. The remaining structure and the combination of the structures can ensure the processing quality in a factory with complete processing conditions. When used on site, the main body only needs to be assembled with the temperature measuring mechanism through the boss. No processing work is required during the assembly process, which is very convenient and can ensure the reliability of the structure. In addition, the pipe diameter of the device is consistent with that of the pipe to be measured, thereby eliminating the pipe diameter change and avoiding the pipe vibration problem caused by fluid flowing in the pipe with a different diameter.

[0018] 2. In this invention, when assembling the temperature measuring mechanism with the main body, the protective sleeve is first passed through the boss to the interior of the main body. Then, the connector is screwed on to engage with the threaded sleeve. During the screwing process, the connector will drive the protective sleeve downward. When the connector pushes the protective sleeve downward, the front end of the downward-moving protective sleeve 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. When the semicircular plate rotates, it will rotate on the side wall of the triangular plate. When the semicircular plate rotates, it will push the arc plate forward through the connecting rod. 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 thus deform. At this time, the deformed connecting... The connecting rod will bulge backward in the middle. When the arc plate deforms, the deformed arc plate will push the limiting plate to move through the connecting plate. When the limiting plate moves, it will push the rubber ring, so that the rubber ring fits against the outer surface of the protective sleeve. Then, when the protective sleeve deforms, 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 semi-circular plate. When the protective sleeve squeezes the flexible ring and pushes the semi-circular plate to expand, the flexible ring and the rubber ring will remain tightly fitted on the surface of the protective sleeve. Through the expansion and contraction of the flexible ring and the rubber ring, the main pipe can be enlarged without expanding the diameter when using the micro-diameter pipe measuring component, saving project costs.

[0019] 3. In this invention, when the connector is screwed on and assembled with the main body, the connector will compress the C-shaped plate during the screwing process. After being compressed, the C-shaped plate will drive the moving ring to move downward. When the moving ring moves down to the side wall of the square groove, the inner wall of the moving ring will compress the flexible ball chain during the downward movement. After being compressed, the flexible ball chain will fit tightly between the connector and the threaded sleeve. The compression of the flexible ball chain can seal the threaded sleeve and the square groove. At the same time, when the flexible ball chain is compressed on the outer surface of the connector, due to the flexibility of the flexible ball chain, it can reduce the loosening of the thread structure between the connector and the threaded sleeve, thus playing an anti-loosening role. The sealing of the flexible ball chain can prevent fluid leakage, reduce the occurrence of poor sealing that affects the measurement results, and improve measurement efficiency.

[0020] 4. In this invention, when the C-shaped plate moves downward, it presses against the positioning rod. The pressure on the positioning rod pushes the annular plate downward. As the annular plate moves downward, it drives the trapezoidal block downward through the hollow plate and the rotating plate. When the trapezoidal block reaches the bottom inner wall of the rectangular groove, the continuing downward movement of the annular plate presses against the rotating plate through the hollow plate. The pressure on the rotating plate pushes the trapezoidal block, causing it to extend out of the opening of the rectangular groove and fit against the inner wall of the protective sleeve. When the C-shaped plate reaches the bottom, the trapezoidal block completely covers the surface of the protective sleeve, ensuring the precise radial position of the protective sleeve within the main body. This ensures the accuracy and stability of the protective sleeve's position within the main body and guarantees the sensitivity of the temperature element measurement.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0025] Figure 3 for Figure 2 Enlarged view at point C;

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

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

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

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

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

[0031] Figure 9 This is a schematic diagram of the moving mechanism structure of the present invention.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] In the diagram: 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. Limiting 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. Ring plate; 503. Hollow plate; 504. Rotating plate; 505. Trapezoidal block; 6. Temperature measuring mechanism; 601. Protective sleeve; 602. Connector; 603. Temperature measuring head. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-9 As shown, the present invention is a small-diameter pipe temperature measuring device, including 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 formed inside the boss 101, the side wall of the rectangular groove 102 being open, a threaded sleeve 103 being fixedly connected to the top inner wall of the boss 101, a plurality of square grooves 104 being formed on the side wall of the threaded sleeve 103, a plurality of triangular plates 105 being fixedly connected to the inner wall of the boss 101, and also including;

[0036] The sealing mechanism 2 includes several 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. The ends of the several springs 203 near the main body 1 are fixedly connected to a movable ring 201. The movable 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 of the bottom of the boss 101. Connecting plates 302 are rotatably connected to the left and right sides of the arc-shaped plates 301. A connecting rod 303 is rotatably connected between two connecting plates 302. A semi-circular plate 304 is fixedly connected to the central axis of the connecting rod 303. A flexible ring 305 is rotatably connected to the side of the three semi-circular plates 304 away from the connecting rod 303. When the C-shaped plate 202 is squeezed, it will drive the moving ring 201 to move down. 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. After being squeezed, the flexible ball chain 204 will be tightly attached between the connector 602 and the threaded sleeve 103.

[0038] The C-shaped plate 202 is slidably connected to the bottom side wall of the threaded sleeve 103 in the middle. The side wall of the moving ring 201 is provided with a flexible ball chain 204. The flexible ball chain 204 is slidably connected to the inside of several square grooves 104. The compression of the flexible ball chain 204 can play a sealing role between the threaded sleeve 103 and the square grooves 104.

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

[0040] A pushing mechanism 4 is provided on the side wall of the arc plate 301. The pushing mechanism 4 includes a spring shaft 401 fixedly connected to the side of the arc plate 301 near the rubber ring 307. A sliding sleeve 402 is slidably connected to the outer surface of the spring shaft 401. A swing plate 403 is rotatably connected to the side of the sliding sleeve 402 near the connecting plate 302. 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. A semi-circular plate 404 is fixedly connected to the side of the sliding sleeve 402 away from the arc plate 301. When the sliding sleeve 402 slides, it will squeeze the rubber ring 307 on the surface of the protective sleeve 601 through the semi-circular plate 404.

[0041] The boss 101 is equipped with a moving mechanism 5. The moving mechanism 5 includes several positioning rods 501 that are slidably connected inside the boss 101. The ends of the positioning rods 501 near the main body 1 pass through the top outer wall of the rectangular groove 102 and extend into the interior. The tops of the positioning rods 501 are in contact with 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. After being squeezed, the positioning rods 501 will push the annular plate 502 downward. When the annular plate 502 moves downward, it will drive the trapezoidal block 505 downward through the hollow plate 503 and the rotating plate 504.

[0042] An annular plate 502 is fixedly connected to the extended ends of several positioning rods 501. Several return springs are fixedly connected between the annular plate 502 and the top inner wall of the rectangular groove 102. Several hollow plates 503 are fixedly connected to the side of the annular plate 502 away from the positioning rods 501. The hollow plates 503 are arranged symmetrically in pairs. Each pair of hollow plates 503 is arranged in a circular array with the center of the annular plate 502 as the center. Two rotating plates 504 are rotatably connected between two hollow plates 503. A trapezoidal block 505 is rotatably connected to the side away from the hollow plate 503. The side of the trapezoidal block 505 away from the hollow plate 503 is made of flexible material. 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, which continues to move down, will squeeze the rotating plate 504 through the hollow plate 503. After being squeezed, the rotating plate 504 will push the trapezoidal block 505, causing the trapezoidal block 505 to extend out of the opening of the rectangular groove 102.

[0043] The boss 101 is equipped with a temperature measuring mechanism 6. The temperature measuring mechanism 6 includes a connector 602 that is threaded into the threaded sleeve 103. A protective sleeve 601 is fixedly connected to the bottom of the connector 602. When assembling the temperature measuring mechanism 6 with the main body 1, the protective sleeve 601 is first passed through the boss 101 to the inside of the main body 1. Then, the connector 602 is screwed to make the connector 602 engage with the threaded sleeve 103. During the screwing process, the connector 602 will drive the protective sleeve 601 to move down. When the connector 602 pushes the protective sleeve 601 down, the front end of the downward-moving protective sleeve 601 will first squeeze the flexible ring 305.

[0044] The protective sleeve 601 penetrates the inner wall of the main body 1 and extends into the interior. The internal thread of the connector 602 is connected to the temperature measuring head 603. The bottom of the temperature measuring head 603 penetrates into the interior of the connector 602. When the protective sleeve 601 squeezes the flexible ring 305 to push the semi-circular plate 304 to expand, the flexible ring 305 and the rubber ring 307 will remain tightly attached to 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 the corresponding pipe processing plant. The main body 1 can be directly cut from the pipe fitting with the same specifications as the pipe to be measured. The remaining structure and the combination between the structures can ensure the processing quality in the factory with complete processing conditions. When used on site, the main body 1 only needs to be assembled with the temperature measuring mechanism 6 through the boss 101. No processing work is required during the assembly process, which is very convenient and can ensure the reliability of the structure. In addition, the pipe diameter of the device is consistent with the pipe to be measured, thereby eliminating the pipe diameter change and avoiding the pipe vibration problem caused by fluid flowing in the pipe with a different diameter.

[0046] When assembling the temperature measuring mechanism 6 with the main body 1, first, the protective sleeve 601 is passed through the boss 101 to reach the interior of the main body 1. Then, the connector 602 is screwed on to engage with the threaded sleeve 103. 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 downward, the front end of the downward-moving protective sleeve 601 will first squeeze the flexible ring 305. The flexible ring 305 is squeezed. The semicircular plate 304 will then expand outward and push its top to rotate. As the semicircular plate 304 rotates, it will also rotate along the side wall of the triangular plate 105. This rotation of the semicircular plate 304 will push the arc-shaped plate 301 forward via the connecting rod 303. Simultaneously, as the connecting rod 303 pushes the arc-shaped plate 301, it deforms due to the push from the connecting rod 303. At this point, the deformed connecting rod 303... The middle part will bulge backward. When the arc plate 301 deforms, the deformed arc plate 301 will push the limiting plate 306 to move through the connecting plate 302. When the limiting plate 306 moves, it will push the rubber ring 307, so that the rubber ring 307 fits against the outer surface of the protective sleeve 601. Then, when the protective sleeve 601 deforms, 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 semi-circular plate 404. When the protective sleeve 601 squeezes the flexible ring 305 to push the semi-circular plate 304 to expand, the flexible ring 305 and the rubber ring 307 will remain tightly attached to the surface of the protective sleeve 601. Through the expansion and contraction of the flexible ring 305 and the rubber ring 307, the pipe of the main body 1 can be enlarged without the need to expand the diameter when the micro-diameter measuring component is used, saving project costs.

[0047] When the connector 602 is screwed on to assemble with the main body 1, the connector 602 will compress the C-shaped plate 202 during the screwing process. This compression will cause the moving ring 201 to move downwards. When the moving ring 201 moves to the side wall of the square groove 104, the inner wall of the moving ring 201 will compress the flexible ball chain 204 during its downward movement. The flexible ball chain 204, after being compressed, will tightly adhere between the connector 602 and the threaded sleeve 103. The compression can seal the threaded sleeve 103 and the square groove 104. At the same time, when the flexible ball chain 204 is compressed on the outer surface of the connector 602, the flexibility of the flexible ball chain 204 can reduce the loosening of the thread structure between the connector 602 and the threaded sleeve 103, thus playing an anti-loosening role. The sealing of the flexible ball chain 204 can prevent fluid leakage, reduce the occurrence of poor sealing that affects the measurement results, and improve measurement efficiency.

[0048] When the C-shaped plate 202 moves downward, it presses against the positioning rod 501. The pressure on the positioning rod 501 pushes the annular plate 502 downward. As the annular plate 502 moves downward, it drives the trapezoidal block 505 downward through the hollow plate 503 and the rotating plate 504. When the trapezoidal block 505 reaches contact with the bottom inner wall of the rectangular groove 102, the continuing downward movement of the annular plate 502 presses against the rotating plate 504 through the hollow plate 503. When compressed, the trapezoidal block 505 is pushed 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 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 merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A small-diameter pipe temperature measuring device, comprising a main body (1), wherein 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 formed 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 formed on the side wall of the threaded sleeve (103), and a plurality of triangular plates (105) are fixedly connected to the inner wall of the boss (101), characterized in that, Also includes; The sealing mechanism (2) includes several 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). A movable ring (201) is fixedly connected to one end of the several springs (203) near the main body (1). A C-shaped plate (202) is fixedly connected to the movable ring (201) away from the threaded sleeve (103). The rotating mechanism (3) includes 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) are rotatably connected to connecting plates (302). A connecting rod (303) is rotatably connected between the two connecting plates (302). A semi-circular plate (304) is fixedly connected to the central axis of the connecting rod (303). A flexible ring (305) is rotatably connected to the side of the three semi-circular plates (304) away from the connecting rod (303). The C-shaped plate (202) is slidably connected to the bottom side wall of the threaded sleeve (103) at its center. The side wall of the moving ring (201) is provided with a flexible ball chain (204), which is slidably connected to the inside of several square grooves (104). The connecting plate (302) is rotatably connected to the limiting plate (306) on the side away from the arc plate (301), and a rubber ring (307) is slidably connected to one end of the limiting plate (306) away from the connecting plate (302). The side wall of the semicircular plate (304) is in contact with the triangular plate (105).

2. The pipe temperature measuring device for small diameter pipes according to claim 1, characterized in that: The side wall of the arc plate (301) is provided with a pushing mechanism (4). The pushing mechanism (4) includes a spring shaft (401) fixedly connected to the side of the arc plate (301) near the rubber ring (307). A sliding sleeve (402) is slidably connected to the outer surface of the spring shaft (401). A swing plate (403) is rotatably connected to the side of the sliding sleeve (402) near the connecting plate (302). 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). A semi-circular plate (404) is fixedly connected to the side of the sliding sleeve (402) away from the arc plate (301).

3. The pipe temperature measuring device for small diameter pipes according to claim 2, characterized in that: The boss (101) is provided with a moving mechanism (5). The moving mechanism (5) includes a plurality of positioning rods (501) slidably connected inside the boss (101). The ends of the plurality of positioning rods (501) near the main body (1) penetrate through the top outer wall of the rectangular groove (102) and extend into the interior. The tops of the plurality of positioning rods (501) are in contact with the bottom outer wall of the C-shaped plate (202).

4. The pipe temperature measuring device with a small diameter as described in claim 3, characterized in that: An annular plate (502) is fixedly connected to the extended ends of several positioning rods (501). Several return springs are fixedly connected between the annular plate (502) and the top inner wall of the rectangular groove (102). Several hollow plates (503) are fixedly connected to the side of the annular plate (502) away from the positioning rods (501). Several hollow plates (503) are arranged symmetrically in pairs. Each group of hollow plates (503) is arranged in a circumferential array with the middle of the annular plate (502) as the center. Two rotating plates (504) are rotatably connected between two hollow plates (503). A trapezoidal block (505) is rotatably connected to the side of the two rotating plates (504) away from the hollow plate (503). The side of the trapezoidal block (505) away from the hollow plate (503) is made of flexible material. The trapezoidal block (505) is slidably connected to the opening of the rectangular groove (102).

5. A small-diameter pipe temperature measuring device according to claim 4, characterized in that: The boss (101) is provided with a temperature measuring mechanism (6), which includes a connector (602) threaded inside the threaded sleeve (103), and a protective sleeve (601) is fixedly connected to the bottom of the connector (602).

6. A small-diameter pipe temperature measuring device according to claim 5, characterized in that: The protective sleeve (601) penetrates the inner wall of the main body (1) and extends into the interior. The internal thread of the connector (602) is connected to a temperature measuring head (603), and the bottom of the temperature measuring head (603) penetrates into the interior of the connector (602).

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