Platinum rhodium thermocouple wire temperature attenuation measuring device
By installing scrapers and fans outside the protection tube to clean impurities on the surface of the protection tube regularly, the problem of increasing thermal resistance of the protection tube in high-temperature smoke environments is solved, and the accuracy of temperature measurement is improved.
Patent Information
- Application Number
- CN202420684390.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-06
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-06
AI Technical Summary
In high-temperature smoke environments, impurities such as coal ash are easily adhered to the surface of the protective tube, resulting in an increase in thermal resistance of the protective tube, hindering heat conduction, and thus making the temperature measurement results in inaccurate.
A platinum-rhodium thermocouple wire temperature attenuation measuring device is designed, and the protection tube is cleaned regularly by installing a scraper outside the protection tube and regularly cleaning it to prevent impurities from accumulating. The device includes a box, a first thermocouple, a second thermocouple, a telescope, a scraper and a fan. Through the cooperation of the scraper and a fan, impurities on the surface of the protection tube are removed.
It effectively prevents the accumulation of impurities on the surface of the protective tube, reduces thermal resistance, ensures normal conduction of heat, and improves the accuracy of temperature measurement.
Smart Images
Figure CN222652396U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermocouples, and in particular to a temperature attenuation measuring device of a platinum-rhodium thermocouple wire. Background Art
[0002] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They directly measure temperature and convert temperature signals into thermoelectric potential signals, which are then converted into the temperature of the measured medium through electrical instruments.
[0003] When the temperature at a certain position in a high-temperature smoke duct is measured at a fixed point, the hot end of the galvanic wire needs to be in contact with the point to be measured and the temperature is measured. After the thermocouple is used in a high-temperature environment for a long time, the galvanic wire will experience temperature attenuation. The temperature attenuation of the galvanic wire can be analyzed by comparing the measurement data with another thermocouple.
[0004] In a high-temperature smoke environment, impurities such as coal ash are easily adhered to the surface of the protection tube. Dust attaches to the protection tube, which increases the thermal resistance of the protection tube and hinders the conduction of heat into the protection tube. At this time, the temperature indication is lower than the true value of the measured temperature, resulting in inaccurate temperature measurement results. Utility Model Content
[0005] In view of the shortcomings of the prior art, the present invention provides a platinum-rhodium thermocouple wire temperature attenuation measuring device, which prevents impurities from accumulating on the surface of the protection tube by arranging a scraper outside the protection tube and cleaning the protection tube regularly.
[0006] Technical Solution
[0007] In order to achieve the above objectives, this utility model is implemented through the following technical solutions:
[0008] A platinum-rhodium thermocouple wire temperature attenuation measuring device, comprising:
[0009] A box body, wherein a cavity is formed in the box body;
[0010] A first thermocouple, one end of which passes through the top of the box body and is arranged in the cavity hole, a second thermocouple is arranged on one side of the first thermocouple close to the longitudinal axis of the box body, and the first thermocouple and the second thermocouple are symmetrically distributed along the longitudinal axis of the box body;
[0011] A telescopic member, wherein the fixed end of the telescopic member is connected to the fixed plate, and the telescopic end of the telescopic member is connected to a scraper through a piston rod, and the scraper is used to scrape impurities on the surface of the shell;
[0012] The fan has a fixed portion connected to a fixed plate, an output end of the fan is connected to a box body through an air pipe, an air outlet is provided through a side of the box body away from the fan, and the air outlet is located directly above the scraper.
[0013] Preferably, the diameters of the first thermocouple and the second thermocouple extending into the cavity are the same, and the diameter of the first thermocouple located in the cavity is smaller than the width of the cavity.
[0014] Preferably, the shell is a protective box, one end of the shell away from the fan extends into the measured pipeline, and the shell, scraper and box body are all arranged in the measured pipeline.
[0015] Preferably, the scraper is matched with the outer wall of the shell, and the scraper moves along the longitudinal axis direction of the shell under the action of the telescopic member.
[0016] Preferably, the piston rod is connected to the side of the scraper through a connecting plate, and a fixing strip is connected to each of the two sides of the connecting plate, and one end of the fixing strip away from the connecting plate is connected to a side of the scraper close to the piston rod.
[0017] Preferably, the scraper is a circular plate, and the longitudinal section view of one end of the scraper is triangular, and the longitudinal section view of one end of the scraper consists of two straight lines and an arc, and both straight lines are inclined downward.
[0018] Preferably, the distance between the scraper blade tip and the box body is smaller than the distance between the scraper tail and the box body.
[0019] Beneficial Effects
[0020] The utility model provides a platinum-rhodium thermocouple wire temperature attenuation measuring device. Compared with the prior art, it has the following beneficial effects:
[0021] 1. The scraper scrapes off the impurities adhering to the surface of the shell to ensure the cleanliness of the shell. Some of the scraped impurities fall on the top of the scraper. The surface of the top of the scraper is inclined downward, and most of the impurities slide down along the inclined surface of the scraper under the action of their own gravity.
[0022] 2. The fan has low power. The wind blown by the fan passes through the air pipe, box body, and air outlet in turn to blow the top of the scraper, blowing off the impurities remaining on the scraper surface. The scraper is like an umbrella surface, which can reduce the probability of the blown-off impurities adhering to the shell again, and can also prevent the wind from blowing directly onto the shell, avoiding cooling caused by the wind, and ensuring that the heat is normally transferred to the inside of the shell.
[0023] 3. The first thermocouple and the second thermocouple are placed in the same housing, with the same temperature measurement environment to reduce errors. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 This is a schematic diagram of the structure of the utility model.
[0026] Figure 2 This is a practical explosion diagram.
[0027] Figure 3 It is a schematic diagram of the structure where the telescopic parts and the fan are located.
[0028] Figure 4 for Figure 3 Front cross-sectional view of .
[0029] Figure 5 This is a bottom view of the box.
[0030] Figure 6 This is the left side cross-sectional view of the scraper.
[0031] The reference numerals in the figure are:
[0032] 11 a first thermocouple, 12 a second thermocouple, 13 a housing, 14 a telescopic member, 15 a piston rod, 16 a fan, 17 a box body, 18 a cavity, 19 an air pipe;
[0033] 21 connecting plate, 22 scraper, 23 fixing strip, 3 air outlet. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical solution and advantages of the practical embodiment clearer, the technical solution in the practical embodiment is clearly and completely described. Obviously, the described embodiment is a part of the practical embodiment, not all of the embodiments. Based on the embodiments in this practical, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical.
[0035] The embodiment of the present application provides a platinum-rhodium thermocouple wire temperature attenuation measurement device to solve the problem that in a high-temperature smoke environment, impurities such as coal ash are easily adhered to the surface of the protection tube. Dust attaches to the protection tube, the thermal resistance of the protection tube increases, and heat is blocked from being conducted into the protection tube. At this time, the temperature indication is lower than the true value of the measured temperature, resulting in inaccurate temperature measurement results. When in use, a scraper is set on the outside of the protection tube and the protection tube is cleaned regularly to prevent impurities from accumulating on the surface of the protection tube.
[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0037] Reference Figure 1-Figure 6 , a platinum-rhodium thermocouple wire temperature attenuation measuring device, comprising:
[0038] A box body 17, wherein a cavity 18 is formed in the box body 17;
[0039] A first thermocouple 11, one end of the first thermocouple 11 passes through the top of the box body 17 and is arranged in the cavity 18, a second thermocouple 12 is arranged on one side of the first thermocouple 11 close to the longitudinal axis of the box body 17, and the first thermocouple 11 and the second thermocouple 12 are symmetrically distributed along the longitudinal axis of the box body 17;
[0040] The first thermocouple 11 and the second thermocouple 12 are located in the same cavity 18, so that the temperature measurement environment of the first thermocouple 11 and the second thermocouple 12 is the same;
[0041] The first thermocouple 11 and the second thermocouple 12 do not contact each other and maintain a certain distance to avoid heat transfer between the first thermocouple 11 and the second thermocouple 12 due to contact, thereby preventing the test results from being affected;
[0042] A telescopic member 14, the fixed end of which is connected to the fixed plate, and the telescopic end of which is connected to a scraper 22 via a piston rod 15, the scraper 22 being used to scrape away impurities on the surface of the housing 13;
[0043] The fan 16 has a fixed portion connected to the fixed plate, and the output end of the fan 16 is connected to the box body 17 through the air pipe 19. The box body 17 has an air outlet 3 extending through the side away from the fan 16. The air outlet 3 is located directly above the scraper 22.
[0044] The air outlet 3 is located just above the scraper 22 , and the wind blown out by the fan 16 can be blown to the surface of the scraper 22 through the air pipe 19 , the box body 17 , and the air outlet 3 , and the impurities remaining on the scraper 22 are blown away.
[0045] In a further embodiment, the diameters of the first thermocouple 11 and the second thermocouple 12 extending into the cavity 18 are the same, and the diameter of the first thermocouple 11 located in the cavity 18 is smaller than the width of the cavity 18 .
[0046] The diameters of the first thermocouple 11 and the second thermocouple 12 extending into the cavity 18 are the same, so that the width of the cavity 18 accommodating the first thermocouple 11 and the second thermocouple 12 is a fixed value, which reduces the volume of the cavity 18 and the volume of the housing 13, thereby saving materials.
[0047] In a further embodiment, the housing 13 is a protective box, and one end of the housing 13 away from the fan 16 extends into the measured pipeline. The housing 13, the scraper 22, and the box body 17 are all arranged in the measured pipeline.
[0048] The housing 13 is located in the measured pipeline, so that the hot ends of the first thermocouple 11 and the second thermocouple 12 in the housing 13 are both located in the measured pipeline;
[0049] The scraper 22 and the box body 17 are located in the pipeline to be tested, so that the housing 13 can be cleaned in the pipeline without removing the housing 13 from the pipeline;
[0050] The wind blown out of the box body 17 can also directly clean the scraper 22.
[0051] In a further embodiment, the scraper 22 is matched with the outer wall of the shell 13 , and the scraper 22 moves along the longitudinal axis direction of the shell 13 under the action of the telescopic member 14 .
[0052] The scraper 22 is driven by the telescopic member 14 to repeatedly move in the vertical direction to scrape away impurities adhered to the surface of the housing 13 .
[0053] In a further embodiment, the piston rod 15 is connected to the side of the scraper 22 through a connecting plate 21, and a fixing strip 23 is connected to each side of the connecting plate 21. The end of the fixing strip 23 away from the connecting plate 21 is connected to the side of the scraper 22 close to the piston rod 15.
[0054] The fixing strip 23 , the connecting plate 21 and the scraper 22 form a triangular structure. The triangle is stable, and the fixing strip 23 improves the overall stability of the connecting plate 21 and the scraper 22 .
[0055] In a further embodiment, the scraper 22 is a circular plate, and the longitudinal section of one end of the scraper 22 is triangular-shaped. The longitudinal section of one end of the scraper 22 consists of two straight lines and an arc, and both straight lines are inclined downward.
[0056] The upper surface of the scraper 22 is an inclined surface, and impurities falling on the scraper 22 can easily slide down under the action of gravity, thereby reducing the impurities remaining on the scraper 22.
[0057] In a further embodiment, the distance between the tip of the scraper 22 and the box body 17 is smaller than the distance between the tail of the scraper 22 and the box body 17 .
[0058] During use, the housing 13, scraper 22, and box body 17 are inserted into the pipeline to be tested, and the placement channel is fixed (usually welded) and sealed;
[0059] The staff can check whether the surface of the shell 13 is covered with dust through the observation window. If so, the telescopic member 14 is started. The telescopic end of the telescopic member 14 sequentially carries the piston rod 15, the connecting plate 21, the fixing strip 23, and the scraper 22 to reciprocate along the longitudinal axis of the shell 13. During this process, the scraper 22 scrapes off the impurities adhering to the surface of the shell 13 to ensure the cleanliness of the shell 13. Part of the scraped impurities fall on the top of the scraper 22. The surface of the top of the scraper 22 is inclined downward, and most of the impurities are moved along the longitudinal axis of the shell 13 under the action of their own gravity. The inclined surface of the scraper 22 slides down. After scraping, the scraper 22 moves up and moves to a position close to the box body 17, and the fan 16 is started. The fan 16 has a low power. The wind blown by the fan 16 blows the top of the scraper 22 through the air pipe 19, the box body 17, and the air outlet 3 in sequence, blowing off the impurities remaining on the surface of the scraper 22. The scraper 22 is like an umbrella surface, which can reduce the probability of the blown impurities adhering to the shell 13 again, and can also prevent the wind from blowing directly onto the shell 13, avoiding the cooling caused by the wind, and ensuring that the heat is normally transferred to the inside of the shell 13;
[0060] A controller may also be provided, which is electrically connected to the telescopic member 14 , to clean the housing 13 at certain time intervals, thereby automating the operation and avoiding the accumulation of impurities on the housing 13 , thereby solving the problem that impurities on the housing 13 cannot be cleaned in a short time.
[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A platinum-rhodium thermocouple wire temperature attenuation measuring device, characterized in that: include: A box body (17), wherein a cavity (18) is formed in the box body (17); a first thermocouple (11), one end of the first thermocouple (11) passing through the top of the box body (17) and arranged in the hole of the cavity (18); a second thermocouple (12) is arranged on one side of the first thermocouple (11) close to the longitudinal axis of the box body (17); the first thermocouple (11) and the second thermocouple (12) are symmetrically distributed along the longitudinal axis of the box body (17); A telescopic member (14), wherein a fixed end of the telescopic member (14) is connected to a fixed plate, and the telescopic end of the telescopic member (14) is connected to a scraper (22) via a piston rod (15), and the scraper (22) is used to scrape impurities on the surface of the housing (13); A fan (16), wherein the fixing portion of the fan (16) is connected to the fixing plate, the output end of the fan (16) is connected to the box body (17) via an air pipe (19), and an air outlet (3) is provided through a side of the box body (17) away from the fan (16), and the air outlet (3) is located directly above the scraper (22).
2. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The diameters of the parts of the first thermocouple (11) and the second thermocouple (12) extending into the cavity (18) are the same, and the diameter of the part of the first thermocouple (11) located in the cavity (18) is smaller than the width of the cavity (18).
3. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The shell (13) is a protective box. One end of the shell (13) away from the fan (16) extends into the pipeline to be tested. The shell (13), the scraper (22) and the box body (17) are all arranged in the pipeline to be tested.
4. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The scraper (22) is matched with the outer wall of the shell (13), and the scraper (22) moves along the longitudinal axis direction of the shell (13) under the action of the telescopic member (14).
5. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The piston rod (15) is connected to the side of the scraper (22) via a connecting plate (21), and a fixing strip (23) is connected to each of the two sides of the connecting plate (21), and one end of the fixing strip (23) away from the connecting plate (21) is connected to a side of the scraper (22) close to the piston rod (15).
6. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The scraper (22) is a circular plate, and the longitudinal section view of one end of the scraper (22) is triangular-shaped. The longitudinal section view of one end of the scraper (22) consists of two straight lines and an arc, and both straight lines are inclined downward.
7. A platinum-rhodium thermocouple wire temperature attenuation measuring device according to claim 1, characterized in that: The distance between the tip of the scraper (22) and the box body (17) is smaller than the distance between the tail of the scraper (22) and the box body (17).