Thermocouple sheath and thermocouple

Abstract

The application provides a thermocouple sheath and a thermocouple, and relates to the technical field of thermocouples. The thermocouple sheath comprises a measuring part sheath, the measuring part sheath comprises a straight pipe section and a tapered pipe section connected to the lower end of the straight pipe section, the tapered pipe section is used for penetrating through a measuring hole formed on the pipe wall of a to-be-measured pipeline and extending into the to-be-measured pipeline to measure the temperature of the medium in the to-be-measured pipeline; a first boss is arranged at the connection position of the straight pipe section and the tapered pipe section, the first boss is arranged in parallel with the plane where the radial direction of the measuring hole is located, and the first boss is in interference fit with the measuring hole. By arranging the first boss and in interference fit with the measuring hole, the gap between the sheath and the measuring hole can be compensated, the vibration of the sheath caused by high-speed airflow can be effectively eliminated, the risk of cracks of the sheath caused by vibration can be reduced, and the service life is prolonged. The thermocouple with the above-mentioned thermocouple sheath has a long service life and wide applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermocouple, in particular to a thermocouple sheath and a thermocouple. BACKGROUND

[0002] Thermocouple is a common temperature measuring device in modern industry. The strength of thermocouple device is not high, and the medium temperature is usually measured by a protective sheath. Therefore, the performance of the protective sheath will directly affect the service life and working stability of the thermocouple. As a device directly contacting the medium, the sheath is affected by the medium temperature, pressure, scouring and the like, and the material and shape design of the sheath will directly affect the service life of the sheath. Especially in the high-temperature and high-pressure environment of the contemporary industry, the requirements for the sheath are gradually increasing, and the leakage phenomenon of the sheath used in practical applications is gradually increasing. The leakage will affect the service life and working stability of the thermocouple, and in severe cases, it will even endanger the system and personal safety.

[0003] At present, the main forms of thermocouple sheath are straight-through type and conical type. The straight-through type sheath is convenient to install and simple in process, and is used more in low-temperature and low-flow conditions. The disadvantage is that there is a certain gap between the sheath and the pipeline after installation, and the sheath will produce high-frequency vibration under the scouring of high-temperature, high-pressure and high-flow medium conditions, causing fatigue fracture at the root of the sheath. The conical sheath can compensate for the gap between the pipeline and the sheath, and eliminate the influence of sheath vibration, but it has high requirements for the pipeline measuring hole and the size of the pipe seat, and is difficult to process, and it is not universal.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] One of the purposes of the present application includes providing a thermocouple sheath to overcome the above technical problems.

[0006] The second purpose of the present application includes providing a thermocouple containing the above-mentioned thermocouple sheath.

[0007] The present application can be implemented as follows:

[0008] In a first aspect, the present application provides a thermocouple sheath, comprising a measuring part sheath, the measuring part sheath comprising a straight pipe segment and a tapered pipe segment connected to the lower end of the straight pipe segment, the tapered pipe segment being used to pass through a measuring hole formed on the pipe wall of a to-be-measured pipeline and extend into the to-be-measured pipeline to measure the temperature of the medium in the to-be-measured pipeline.

[0009] A first boss is arranged at the connection between the straight pipe segment and the tapered pipe segment, the first boss being arranged parallel to the plane where the radial direction of the measuring hole is located, and the first boss is in interference fit with the measuring hole.

[0010] In an optional embodiment, a second boss is arranged between the upper end surface of the first boss and the upper end surface of the straight pipe segment, the second boss being parallel to the first boss, and the second boss is in interference fit with the measuring hole.

[0011] In an optional embodiment, the distance between the lower end surface of the second boss and the upper end surface of the first boss is equal to the distance between the upper end surface of the second boss and the upper end surface of the straight pipe section.

[0012] In an optional embodiment, the projections of the first boss and the second boss on the plane in which the radial direction of the measuring hole lies do not coincide.

[0013] In an optional embodiment, the first boss and the second boss each independently has a plurality of arc-shaped protrusions; the plurality of arc-shaped protrusions are arranged at intervals along the circumferential direction of the measuring hole.

[0014] In an optional embodiment, the plurality of arc-shaped protrusions are arranged at equal intervals along the circumferential direction of the measuring hole.

[0015] In an optional embodiment, the distance between the lower end surface of the first boss and the lower end surface of the tapered pipe section is 78-82 mm; and / or, the distance between the upper end surface of the second boss and the upper end surface of the straight pipe section is 50-55 mm; and / or, the distance between the center of the first boss and the center of the second boss is 70-73 mm.

[0016] In an optional embodiment, the distance by which the first boss protrudes outward from the outer wall of the straight pipe section is 3.5-4.5 mm; and / or, the distance by which the second boss protrudes outward from the outer wall of the straight pipe section is 3.5-4.5 mm.

[0017] In an optional embodiment, the thermocouple sheath further comprises a fixed portion sheath connected to the upper end of the straight pipe section, and the connection between the fixed portion sheath and the straight pipe section forms a boss, and the boss is fixedly connected to the outer wall of the pipe to be measured.

[0018] In a second aspect, the present application provides a thermocouple, which comprises a hot electrode and a thermocouple sheath as in any of the preceding embodiments, the thermocouple sheath being sleeved on the surface of the hot electrode.

[0019] The beneficial effects of the present application include:

[0020] By arranging the first boss at the connection between the straight pipe section and the tapered pipe section and making the boss in interference fit with the measuring hole, the gap between the thermocouple sheath and the measuring hole can be effectively compensated, the vibration of the thermocouple sheath caused by high-speed airflow can be eliminated, the risk of cracks in the thermocouple sheath caused by vibration can be reduced, and the service life of the thermocouple sheath can be prolonged.

[0021] The thermocouple sheath has a simple structure and is easy to process, and the boss can be simply polished or machined on site according to the actual size of the pipe hole during installation, so the application range is wide.

[0022] The thermocouple with the above-mentioned thermocouple sheath has a long service life and wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the thermocouple sheath used in this application when it is used in conjunction with the pipe to be tested.

[0025] Figure 2 This is a schematic diagram of the thermocouple sheath in this application;

[0026] Figure 3 for Figure 2 A schematic diagram of the arc-shaped protrusion of the first protrusion in the middle;

[0027] Figure 4 for Figure 2 A schematic diagram of the arc-shaped protrusion of the second protrusion.

[0028] Icons: 10-Measuring sleeve; 11-Straight pipe section; 12-Cone pipe section; 13-First boss; 14-Second boss; 15-Arc-shaped protrusion; 20-Fixing sleeve; 30-Pipe to be measured; 31-Measuring hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0035] For reference Figure 1 and Figure 2 , the present embodiment provides a thermocouple sleeve for sleeving on the surface of a thermoelectric pole, which comprises a measuring part sleeve 10 and a fixing part sleeve 20.

[0036] The above-mentioned thermocouple sleeve is used in cooperation with a to-be-measured pipeline 30 (such as Figure 1 ), which is provided with a measuring hole 31 penetrating through the wall thereof. Taking the to-be-measured pipeline 30 as an example of being placed horizontally, the measuring hole 31 is provided in the vertical direction, and in the measuring state, the thermoelectric pole is inserted into the to-be-measured pipeline 30 through the measuring hole 31 to measure the temperature of the medium in the to-be-measured pipeline 30; the fixing part sleeve 20 is correspondingly fixed to the outer wall of the to-be-measured pipeline 30 under the premise of meeting the test cooperation position of the thermoelectric pole and the measuring hole 31, and the measuring part sleeve 10 is connected to the lower end of the fixing part sleeve 20.

[0037] It should be noted that Figure 1 the to-be-measured pipeline 30 shown is only a cross section of the upper half when it is placed horizontally, and the cross section of the lower half is not shown.

[0038] The above-mentioned measuring part sleeve 10 comprises a straight pipe section 11 and a tapered pipe section 12 connected to the lower end of the straight pipe section 11, and the tapered pipe section 12 is used to penetrate through the measuring hole 31 provided on the wall of the to-be-measured pipeline 30 and extend into the to-be-measured pipeline 30 to measure the temperature of the medium in the to-be-measured pipeline 30.

[0039] The fixing part sleeve 20 is connected to the upper end of the straight pipe section 11, and the connection between the fixing part sleeve 20 and the straight pipe section 11 forms a pipe table, which is fixedly connected with the outer wall of the to-be-measured pipeline 30.

[0040] In the present embodiment, the measuring part sleeve 10 is provided with at least one boss, for example, the number of bosses can be only one, or two, three, four or more.

[0041] The connection between the straight pipe section 11 and the tapered pipe section 12 (i.e., the variable-diameter part between the straight pipe section 11 and the tapered pipe section 12) is provided with a boss, defined as a first boss 13. The first boss 13 is arranged in parallel with the plane in which the radial direction of the measuring hole 31 lies, and can also be understood as the included angle between the first boss 13 and the axis of the straight pipe section 11 being 90°. The first boss 13 is in interference fit with the measuring hole 31.

[0042] By providing the above-mentioned first boss 13 and interference fit with the measuring hole 31, the gap between the thermowell and the measuring hole 31 can be compensated for, effectively eliminating the vibration of the thermowell caused by high-speed airflow, thereby reducing the risk of cracks in the thermowell caused by vibration and prolonging the service life.

[0043] Further, a boss, defined as a second boss 14, is also provided between the upper end surface of the first boss 13 and the upper end surface of the straight pipe section 11. The second boss 14 is parallel to the first boss 13, i.e., the second boss 14 is arranged in parallel with the plane in which the radial direction of the measuring hole 31 lies, or can be understood as the included angle between the second boss 14 and the axis of the straight pipe section 11 being 90°. The second boss 14 is also in interference fit with the measuring hole 31.

[0044] By providing the second boss 14 on the basis of the first boss 13, the relative fixation between the thermowell and the pipe to be measured 30 can be further improved, reducing the possibility of vibration between the two due to the gap and avoiding cracks in the thermowell.

[0045] In some preferred embodiments, the distance between the lower end surface of the second boss 14 and the upper end surface of the first boss 13 is equal to the distance between the upper end surface of the second boss 14 and the upper end surface of the straight pipe section 11. That is, the second boss 14 is arranged at a distance of 1 / 2 between the upper end surface of the first boss 13 and the pipe table.

[0046] By arranging the second boss 14 at this position, a better stabilizing effect can be achieved with fewer bosses.

[0047] In other embodiments, at least one (such as one, two, three or more) boss can be further provided between the second boss 14 and the pipe table, and at least one (such as one, two, three or more) boss can be further provided between the second boss 14 and the first boss 13. The specific arrangement can be made according to actual needs.

[0048] In preferred embodiments, the projections of the above-mentioned first boss 13 and second boss 14 in the plane in which the radial direction of the measuring hole 31 lies do not coincide, and can also be understood as the first boss 13 and the second boss 14 being staggered.

[0049] By arranging the first boss 13 and the second boss 14 in a staggered manner, not only can the vibration of the sleeve be effectively prevented, but also the airflow passage is retained, which is conducive to increasing the effective contact area of the thermocouple sleeve and improving the accuracy of the thermocouple measurement.

[0050] It is worth noting that in other embodiments, the first boss 13 and the second boss 14 are not excluded from being arranged in a non-staggered manner.

[0051] As shown in Figure 3 and Figure 4 In the present application, the first boss 13 and the second boss 14 preferably have a plurality of arc-shaped protrusions 15, respectively; the plurality of arc-shaped protrusions 15 are arranged at intervals along the circumference of the measurement hole 31. Preferably, the plurality of arc-shaped protrusions 15 are arranged at equal intervals along the circumference of the measurement hole 31.

[0052] Optionally, the number of arc-shaped protrusions 15 of the first boss 13 can be 2, 3, 4 or more; the number of arc-shaped protrusions 15 of the second boss 14 can be 2, 3, 4 or more.

[0053] In addition, it is also not excluded that the first boss 13 and the second boss 14 each independently have only one arc-shaped protrusion 15. However, having a plurality of arc-shaped protrusions 15 has stronger stability than having only one arc-shaped protrusion 15 after interference fit.

[0054] In some specific embodiments, the first boss 13 has 3 arc-shaped protrusions 15, and the second boss 14 also has 3 arc-shaped protrusions 15.

[0055] The 3 arc-shaped protrusions 15 of the first boss 13 are equal in size, and the 3 arc-shaped protrusions 15 of the second boss 14 are equal in size. Preferably, the arc-shaped protrusions 15 of the first boss 13 are equal in size to the arc-shaped protrusions 15 of the second boss 14.

[0056] The above-mentioned "arc-shaped" refers to the edge of the protrusion protruding outward (i.e. towards the direction of the hole wall of the measurement hole 31) being arc-shaped, so as to reduce friction and avoid adverse effects on the measurement hole 31 and the pipe wall.

[0057] In an optional embodiment, the distance between the lower end surface of the first boss 13 and the lower end surface of the tapered pipe section 12 can be 78-82mm, such as 78mm, 78.5mm, 79mm, 79.5mm, 80mm, 80.5mm, 81mm, 81.5mm or 82mm, etc. It can also be any other value within the range of 78-82mm.

[0058] The distance between the upper end face of the second boss 14 and the upper end face of the straight pipe section 11 can be 50-55 mm, such as 50 mm, 50.5 mm, 51 mm, 51.5 mm, 52 mm, 52.5 mm, 53 mm, 53.5 mm, 54 mm, or 54.5 mm, etc., or any other value within the range of 50-55 mm.

[0059] The thickness of the first boss 13 can be 12-14 mm, such as 12 mm, 12.5 mm, 13 mm, 13.5 mm, or 14 mm, etc., or any other value within the range of 12-14 mm.

[0060] The thickness of the second boss 14 can also be 12-14 mm, such as 12 mm, 12.5 mm, 13 mm, 13.5 mm, or 14 mm, etc., or any other value within the range of 12-14 mm.

[0061] The distance between the center of the first boss 13 and the center of the second boss 14 can be 70-73 mm, such as 70 mm, 70.5 mm, 71 mm, 71.5 mm, 72 mm, 72.5 mm, or 73 mm, etc., or any other value within the range of 70-73 mm.

[0062] In an optional embodiment, the distance by which the first boss 13 protrudes outward from the outer wall of the straight pipe section 11 can be 3.5-4.5 mm, such as 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, or 4.5 mm, etc., or any other value within the range of 3.5-4.5 mm.

[0063] Similarly, the distance by which the second boss 14 protrudes outward from the outer wall of the straight pipe section 11 can also be 3.5-4.5 mm, such as 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, or 4.5 mm, etc., or any other value within the range of 3.5-4.5 mm.

[0064] The hole diameter of the measuring hole 31 can be 9-10 mm, such as 9 mm, 9.5 mm, or 10 mm, etc., or any other value within the range of 9-10 mm.

[0065] The outer diameter of the straight pipe section 11 can be 28-32 mm, such as 28 mm, 28.5 mm, 29 mm, 29.5 mm, 30 mm, 30.5 mm, 31 mm, 31.5 mm, or 32 mm, etc., or any other value within the range of 28-32 mm.

[0066] The length of the fixed part sleeve 20 can be 58-62mm, such as 58mm, 58.5mm, 59mm, 59.5mm, 60mm, 60.5mm, 61mm, 61.5mm or 62mm, etc., or any other value within the range of 58-62mm.

[0067] The length of the measuring part sleeve 10 can be 220-225mm, such as 220mm, 220.5mm, 221mm, 221.5mm, 222mm, 222.5mm, 223mm, 223.5mm, 224mm, 224.5mm or 225mm, etc., or any other value within the range of 220-225mm.

[0068] The above ranges are suitable for the size of common pipes, and in addition, the distance of the protrusion can be adjusted according to the actual size of the pipe hole on site, which is highly operable and highly universal.

[0069] Correspondingly, the application also provides a thermocouple, which comprises a thermoelectric electrode and the above-mentioned thermocouple sleeve sleeved on the surface of the thermoelectric electrode.

[0070] By sleeving the above-mentioned thermocouple sleeve on the surface of the thermoelectric electrode and achieving interference fit with the measuring hole 31, high-frequency vibration of the thermocouple sleeve and fatigue fracture of the root of the thermocouple sleeve caused by high-temperature high-pressure and high-flow-rate medium working conditions can be effectively avoided, and the service life is prolonged. The above-mentioned thermocouple sleeve is easy to process, and the protrusion can be simply polished or machined according to the actual size of the pipe hole during on-site installation, so it has a wide range of applications.

[0071] In summary, the application sets a protrusion on the thermocouple sleeve, which makes up for the gap between the straight-through sleeve and the pipe hole, effectively solves the problem of cracks in the thermocouple sleeve caused by vibration. The staggered design of the first protrusion 13 and the second protrusion 14 increases the effective contact area of the thermocouple sleeve, ensures the measurement accuracy, and at the same time, the protrusion can be adjusted according to the actual size of the pipe hole on site, which is highly operable and highly universal. The thermocouple with the above-mentioned thermocouple sleeve has a long service life and wide applicability.

[0072] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical range disclosed by the application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A thermocouple sheath characterized by, The measuring part sleeve comprises a straight tube section and a tapered tube section connected to the lower end of the straight tube section, the tapered tube section is used to pass through the measuring hole on the pipe wall of the pipe to be measured and extend into the pipe to be measured to measure the temperature of the medium in the pipe to be measured. The first boss is arranged in parallel with the plane in which the measuring hole is located, and the first boss is in interference fit with the measuring hole. The second boss is arranged between the upper end surface of the first boss and the upper end surface of the straight tube section, the second boss is parallel to the first boss, and the second boss is in interference fit with the measuring hole. The projections of the first boss and the second boss on the plane in which the measuring hole is located do not coincide, and the first boss and the second boss are staggered. The first boss and the second boss each independently have a plurality of arc-shaped protrusions, and the arc-shaped protrusions are arranged at equal intervals along the circumference of the measuring hole.

2. The thermowell of claim 1, wherein The distance between the lower end surface of the second boss and the upper end surface of the first boss is equal to the distance between the upper end surface of the second boss and the upper end surface of the straight tube section.

3. The thermowell of claim 1, wherein The arc-shaped protrusions are arranged at equal intervals along the circumference of the measuring hole.

4. The thermowell of claim 1, wherein The distance between the lower end surface of the first boss and the lower end surface of the tapered tube section is 78-82mm; and / or, the distance between the upper end surface of the second boss and the upper end surface of the straight tube section is 50-55mm; and / or, the distance between the center of the first boss and the center of the second boss is 70-73mm.

5. The thermowell of claim 4, wherein, The distance by which the first boss protrudes outward from the outer wall of the straight tube section is 3.5-4.5mm; and / or, the distance by which the second boss protrudes outward from the outer wall of the straight tube section is 3.5-4.5mm.

6. The thermowell of claim 5, wherein, The thermocouple sleeve further comprises a fixing part sleeve connected to the upper end of the straight tube section, and a tube boss is formed at the connection between the fixing part sleeve and the straight tube section, and the tube boss is fixedly connected with the outer wall of the pipe to be measured.

7. A thermocouple, characterized by The thermocouple sleeve comprises a thermoelectric electrode and a thermocouple sleeve as claimed in any one of claims 1-6 sleeved on the surface of the thermoelectric electrode.

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