Corrosion-resistant thermocouple

Abstract

This invention discloses a corrosion-resistant thermocouple, relating to the field of thermocouple technology. It solves the technical problems of existing thermocouples, such as the ease with which thermocouple electrodes bend, the easy adhesion of the fluid to be monitored to the thermocouple, affecting the accuracy of the measured medium's temperature, and the difficulty of cleaning. The invention includes a thermocouple body comprising a junction box, thermocouples mounted on the junction box, an insulating and corrosion-resistant layer on the thermocouples, and a device connection port on the side of the junction box. It also includes a protective sleeve mechanism comprising a threaded connector fitted onto the thermocouple, an outer protective sleeve mounted on the threaded connector, and an inner protective sleeve slidably disposed within the outer protective sleeve. This invention utilizes a scraper inside the inner protective sleeve that slides on the thermocouple, employing two elastic scrapers to remove surface deposits from the thermocouple, eliminating the need for disassembly and cleaning, reducing the workload of workers, and effectively preventing the adhesions from affecting the thermocouple.

Description

Technical Field

[0001] This invention belongs to the field of thermocouple technology, and particularly relates to a corrosion-resistant thermocouple. Background Technology

[0002] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They are often used in conjunction with display instruments, recording instruments, and electronic controllers to measure temperature. They are devices that convert temperature signals into thermoelectric potential signals, which are then converted into the temperature of the measured medium by electrical instruments. They are mainly composed of thermocouples, protective tubes, and junction boxes. They are widely used in industries such as petroleum and metallurgy, and can stably measure temperature under extremely harsh working conditions.

[0003] A search revealed a Chinese patent announcement number, CN216846575U, for a high-temperature corrosion resistant wear-resistant thermocouple for chemical applications. This patent features a movable plate, a wear-resistant tube, and a fixed sleeve at the bottom of the thermocouple. Two L-shaped inserts are located on both sides of the wear-resistant tube. After inserting the two L-shaped inserts into the slots inside the fixed sleeve, the wear-resistant tube can be clamped and fixed by the cooperation of the movable plate and the fixed sleeve. This design protects the bottom of the thermocouple during testing, thereby reducing thermocouple wear, extending the service life of the device, and reducing replacement costs.

[0004] Currently, when existing thermocouples are used to monitor fluids in the chemical industry, the thermocouple electrodes are typically fully exposed. Once installed, these electrodes are easily bent due to the flow direction of the measured medium, and the fluid being monitored easily adheres to them. Over time, this affects the accuracy of the measured medium's temperature, and cleaning is also very difficult. Therefore, we have designed a corrosion-resistant thermocouple. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a corrosion-resistant thermocouple that solves the problems of existing thermocouples where the thermocouple electrodes are prone to bending, the fluid to be monitored easily adheres to the thermocouple electrodes, affecting the temperature accuracy of the measured medium, and cleaning is also very difficult.

[0006] To achieve the above objectives, an anti-corrosion thermocouple is provided according to an embodiment of the first aspect of the present invention, comprising a thermocouple body, the thermocouple body including a junction box, thermoelectrodes disposed on the junction box, an insulating and anti-corrosion layer disposed on the thermoelectrodes, and a device connection port disposed on the side of the junction box.

[0007] It also includes a protective sleeve mechanism, which includes a threaded joint fitted on the thermoelectrode, an outer protective sleeve provided on the threaded joint, and an inner protective sleeve slidably provided inside the outer protective sleeve. The inner wall surface of the outer protective sleeve is provided with an installation groove for the inner protective sleeve to slide. Several guide posts are installed in the installation groove, and the inner protective sleeve is movably fitted on each guide post.

[0008] A further improvement is that the casing mechanism also includes two fixed pulleys symmetrically arranged on the inner wall of the outer casing, a base connected to the outer casing, rotating rods rotatably arranged on both sides of the base, worm gears and winding wheels sleeved on each rotating rod and a worm rotatably arranged in the base, a return spring sleeved on each guide post, each return spring connected to the inner casing, the worm having two helical teeth with opposite directions, the two worm gears meshing with each helical tooth of the worm, a pull rope wound on each winding wheel, each pull rope resting on a fixed pulley and connected to the top surface of the inner casing.

[0009] A further improvement is that the protective sleeve mechanism also includes a protective grid sleeve, the thread of which is fitted onto the junction box, and the outer protective sleeve is threaded onto a threaded joint. The protective grid sleeve is used to protect the junction box, and the threaded connection facilitates disassembly and assembly.

[0010] A further improvement is that a scraper is provided inside the bottom port of the inner protective cylinder, the scraper is movably sleeved on the thermoelectric electrode, and an elastic scraper is provided on the inner wall of the scraper, with a through groove provided in the middle of the elastic scraper.

[0011] A further improvement is that the bottom surface of the scraper cylinder is provided with several circularly distributed elastic scraper blades II, each of which is arc-shaped, and when each elastic scraper blade II is closely attached together, it forms a hemispherical shape.

[0012] A further improvement is that both the first elastic scraper and each second elastic scraper are made of an elastomeric corrosion-resistant material.

[0013] A further improvement is that a micro stepper motor is provided on the outer wall of the base, the spindle of the micro stepper motor is connected to the rotating rod, and the power supply of the micro stepper motor is provided by a battery externally mounted on the base.

[0014] A further improvement is that the inner wall of the mounting groove is provided with a number of grooves, and the outer wall of the inner protective cylinder is provided with an elastic rubber rod at the position corresponding to each groove, with each elastic rubber rod slidingly disposed in the groove.

[0015] A further improvement is that each of the elastic rubber rods has a buffer cavity inside, each buffer cavity has several buffer grooves inside, each buffer groove has a buffer spring inside, and the inner wall of the buffer cavity is connected to a buffer block at the groove opening corresponding to each buffer groove, and each buffer block is connected to a buffer spring.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) In this invention, when the thermocouple body is in use, the external micro stepper motor provides power to drive the worm gear in the positive direction. Since the worm gear is provided with two helical teeth in opposite directions, it drives the two worm wheels to move in opposite directions, so that each rotating rod drives the two winding wheels to pull the inner casing to slide in the outer casing in sync, and compresses the return spring. After the return spring is squeezed and deformed, it generates a rebound force, which can expose part of the thermoelectrode. The thermoelectrode is then used to contact the fluid to be measured in the pipeline to monitor the temperature of the fluid to be measured. During the use of the thermocouple body, the thermoelectrode can be buffered by the action of several elastic rubber rods, buffer springs and buffer blocks on the inner casing, so as to effectively avoid the thermoelectrode being directly impacted, causing the thermoelectrode to bend or be punctured on one side, and improving the service life of the thermoelectrode.

[0018] (2) In this invention, when the micro stepper motor provides power to drive the two worm gears in the reverse direction, the inner sleeve slides downward under the action of the rebound force of several reset springs. At this time, the scraper inside the inner sleeve slides on the heat electrode, and the elastic scraper one and elastic scraper two scrape off the surface of the heat electrode without disassembly and cleaning, reducing the workload of workers and thus effectively preventing the adhesion from affecting the heat electrode. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 3 This is a top view of the structure of the present invention;

[0022] Figure 4 This is a top view of the structure of the present invention;

[0023] Figure 5 This is a top view of the structure of the present invention.

[0024] Marked in the image:

[0025] 1. Casing mechanism; 11. Threaded joint; 12. Outer casing; 121. Mounting groove; 122. Guide post; 123. Return spring; 124. Groove; 125. Elastic rubber rod; 126. Buffer cavity; 127. Buffer groove; 128. Buffer spring; 129. Buffer block;

[0026] 13. Inner protective sleeve; 131. Scraper cylinder; 132. Elastic scraper blade one; 133. Through groove; 134. Elastic scraper blade two; 14. Fixed pulley; 15. Base; 16. Rotating rod; 17. Worm gear; 18. Winding reel; 19. Pull rope; 110. Worm;

[0027] 2. Thermocouple body; 21. Junction box; 22. Equipment connection port; 23. Thermocouple electrode; 231. Insulating and anti-corrosion layer; 3. Protective grid cylinder. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0029] Example 1

[0030] like Figure 1 As shown, a corrosion-resistant thermocouple includes a thermocouple body 2. The thermocouple body 2 includes a junction box 21, a thermoelectrode 23 disposed on the junction box 21, an insulating and corrosion-resistant layer 231 disposed on the thermoelectrode 23, and an equipment connection port 22 disposed on the side of the junction box 21. The insulating and corrosion-resistant layer 231 is used to protect the thermoelectrode 23. During installation, a display instrument, a recording instrument, or an electronic regulator is connected to the equipment connection port 22.

[0031] like Figure 2 As shown, it also includes a protective sleeve mechanism 1. The protective sleeve mechanism 1 includes a threaded joint 11 sleeved on the thermoelectric electrode 23, an outer protective sleeve 12 disposed on the threaded joint 11, and an inner protective sleeve 13 slidably disposed inside the outer protective sleeve 12. The inner wall surface of the outer protective sleeve 12 is provided with a mounting groove 121 for the inner protective sleeve 13 to slide. A plurality of guide posts 122 are installed in the mounting groove 121. The inner protective sleeve 13 is movably sleeved on each guide post 122. The mounting groove 121 is used for the sliding of the inner protective sleeve 13. The guide posts 122 are used to limit the inner protective sleeve 13 when it is driven to prevent it from deviating.

[0032] Combination Figure 2As shown, the casing mechanism 1 also includes two fixed pulleys 14 symmetrically arranged on the inner wall of the outer casing 12, a base 15 connected to the outer casing 12, rotating rods 16 rotatably arranged on both sides of the base 15, worm gears 17 and winding wheels 18 sleeved on each rotating rod 16, and a worm 110 rotatably arranged in the base 15. Each guide post 122 is fitted with a return spring 123, and each return spring 123 is connected to the inner casing 13. The worm 110 is provided with two helical teeth, and each helical tooth is in opposite directions. The two worm gears 17 are meshed with each helical tooth of the worm 110. Each winding wheel 18 is wound with a pull rope 19, and each pull rope 19 is respectively placed on the fixed pulleys 14 and connected to the top surface of the inner casing 13. The worm 110 is driven forward by an external micro stepper motor. Two helical teeth running in opposite directions drive two worm gears 17 to move in opposite directions, causing each rotating rod 16 to drive two winding wheels 18 to synchronously pull the inner protective cylinder 13 to slide inside the outer protective cylinder 12 and compress the return spring 123. After the return spring 123 is compressed and deformed, it generates a rebound force, allowing part of the thermoelectrode 23 to be exposed for detection. When the micro stepper motor provides power to drive the two worm gears 17 in the opposite direction, the inner protective cylinder 13 slides downward under the action of the rebound force of several return springs 123. At this time, the scraper 131 inside the inner protective cylinder 13 slides on the thermoelectrode 23, and the elastic scraper 132 and elastic scraper 234 scrape off the surface of the thermoelectrode 23 without disassembly and cleaning, reducing the workload of workers and effectively preventing the adhesion from affecting the thermoelectrode 23.

[0033] Combination Figure 2 As shown, the protective sleeve mechanism 1 also includes a protective grid sleeve 3. The threaded sleeve of the protective grid sleeve 3 is fitted onto the junction box 21, and the outer protective sleeve 12 is threaded onto the threaded joint 11. The protective grid sleeve 3 is used to protect the junction box 21. The threaded connection facilitates disassembly and assembly. The protective grid sleeve 3 is used to protect the junction box 21.

[0034] Combination Figure 2 and Figure 5As shown, a scraper 131 is provided inside the bottom port of the inner casing 13. The scraper 131 is movably sleeved on the heat electrode 23. An elastic scraper blade 132 is provided on the inner wall of the scraper 131. A through groove 133 is provided through the middle of the elastic scraper blade 132. Several circularly distributed elastic scraper blades 134 are provided on the bottom surface of the scraper 131. Each elastic scraper blade 134 is arc-shaped and forms a hemispherical shape when they are close together. The elastic scraper blades 132 and each elastic scraper blade 134 are made of elastomeric corrosion-resistant material. By sliding the scraper 131 inside the inner casing 13 on the heat electrode 23, the elastic scraper blades 132 and elastic scraper blades 134 scrape off the surface adhesive of the heat electrode 23 without disassembly and cleaning, reducing the workload of workers and effectively preventing the adhesive from affecting the heat electrode 23.

[0035] Combination Figure 2 and Figure 3 As shown, in a preferred embodiment, a micro stepper motor is provided on the outer wall of the base 15. The spindle of the micro stepper motor is connected to the rotating rod 16. The power supply of the micro stepper motor is provided by a battery externally mounted on the base 15.

[0036] Example 2

[0037] Combination Figure 2 , Figure 3 and Figure 4 As shown, based on Embodiment 1, the inner wall of the mounting groove 121 is uniformly provided with a plurality of grooves 124, and the outer wall of the inner sleeve 13 is provided with an elastic rubber rod 125 at the position corresponding to each groove 124. Each elastic rubber rod 125 is slidably disposed in the groove 124, and the groove 124 is used for limiting the elastic rubber rod 125.

[0038] Combination Figure 2 and Figure 4 As shown, in a preferred embodiment, each elastic rubber rod 125 has a buffer cavity 126 inside, each buffer cavity 126 has a plurality of buffer grooves 127 inside, each buffer groove 127 has a buffer spring 128 inside, and the inner wall of the buffer cavity 126 is connected to a buffer block 129 at the groove opening corresponding to each buffer groove 127. Each buffer block 129 is connected to the buffer spring 128. During use, the thermocouple body 2 can buffer the thermoelectrode 23 through the action of the plurality of elastic rubber rods 125 on the inner protective sleeve 13, the buffer spring 128, and the buffer block 129, thereby effectively preventing the thermoelectrode 23 from being directly impacted, causing the thermoelectrode 23 to bend or be punctured on one side, and improving the service life of the thermoelectrode 23.

[0039] Combined with appendix Figure 1 To be continued Figure 5As shown, it should be noted that the dimensions of the application document should be selected based on the actual dimensions of the thermocouple body 2 on site; in addition, when implementing the application document, the model of the micro stepper motor should be selected as M42SP-5.

[0040] The working principle of this corrosion-resistant thermocouple is as follows:

[0041] During installation, the staff will put the protective sleeve mechanism 1 on the thermocouple body 2 and the thermoelectrode 23. The insulating and anti-corrosion layer 231 will be used to protect the thermoelectrode 23 from corrosion. The display instrument, recording instrument or electronic regulator will be connected to the equipment connection port 22 and the whole assembly will be installed on the output pipeline of the medium to be measured.

[0042] When the thermocouple body 2 is in use, the worm gear 110 is driven in the forward direction by an external micro stepper motor. Since the worm gear 110 is provided with two helical teeth in opposite directions, it drives the two worm wheels 17 to move in opposite directions. This causes each rotating rod 16 to drive the two winding wheels 18 to pull the inner casing 13 to slide inside the outer casing 12 and compress the return spring 123. After the return spring 123 is compressed and deformed, it generates a rebound force, which can expose part of the thermoelectrode 23. The thermoelectrode 23 then comes into contact with the fluid to be measured in the pipeline to monitor the temperature of the fluid. During the use of the thermocouple body 2, the thermoelectrode 23 can be buffered by the action of several elastic rubber rods 125 on the inner casing 13, as well as the buffer spring 128 and the buffer block 129. This can effectively prevent the thermoelectrode 23 from being directly impacted, causing the thermoelectrode 23 to bend or be punctured on one side, thus improving the service life of the thermoelectrode 23.

[0043] When the micro stepper motor provides power to drive the two worm gears 17 in reverse, the inner sleeve 13 slides downward under the action of the rebound force of several return springs 123. At this time, the scraper 131 inside the inner sleeve 13 slides on the heat electrode 23, and the elastic scraper 132 and elastic scraper 24 scrape off the adhesive on the surface of the heat electrode 23 without disassembly and cleaning, reducing the workload of workers and effectively preventing the adhesive from affecting the heat electrode 23.

[0044] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A corrosion-resistant thermocouple, characterized in that, The thermocouple body (2) includes a junction box (21), a thermocouple electrode (23) disposed on the junction box (21), an insulating and anti-corrosion layer (231) disposed on the thermocouple electrode (23), and a device connection port (22) disposed on the side of the junction box (21). It also includes a protective sleeve mechanism (1), which includes a threaded joint (11) sleeved on the thermoelectric electrode (23), an outer protective sleeve (12) provided on the threaded joint (11), and an inner protective sleeve (13) slidably provided in the outer protective sleeve (12). The inner wall surface of the outer protective sleeve (12) is provided with an installation groove (121) for the inner protective sleeve (13) to slide. Several guide posts (122) are installed in the installation groove (121), and the inner protective sleeve (13) is movably sleeved on each guide post (122). The protective cylinder mechanism (1) further includes two fixed pulleys (14) symmetrically arranged on the inner wall of the outer protective cylinder (12), a base (15) connected to the outer protective cylinder (12), rotating rods (16) rotatably arranged on both sides of the base (15), worm gears (17) and winding wheels (18) sleeved on each rotating rod (16) and worm gears (110) rotatably arranged in the base (15), each guide post (122) is sleeved with a return spring (123), each return spring (123) is connected to the inner protective cylinder (13), the worm gear (110) is provided with two helical teeth, and each helical tooth is in opposite directions, the two worm gears (17) are meshed and connected to each helical tooth of the worm gear (110), each winding wheel (18) is wound with a pull rope (19), each pull rope (19) is respectively placed on the fixed pulleys (14) and connected to the top surface of the inner protective cylinder (13); The inner wall of the mounting groove (121) is provided with a plurality of grooves (124), and the outer wall of the inner sleeve (13) is provided with an elastic rubber rod (125) at the position corresponding to each groove (124), and each elastic rubber rod (125) is slidably disposed in the groove (124); Each of the elastic rubber rods (125) has a buffer cavity (126) inside, and each buffer cavity (126) has a plurality of buffer grooves (127) inside. Each buffer groove (127) has a buffer spring (128) inside. The inner wall of the buffer cavity (126) is connected to a buffer block (129) at the groove opening corresponding to each buffer groove (127). Each buffer block (129) is connected to the buffer spring (128) respectively.

2. The corrosion-resistant thermocouple according to claim 1, characterized in that, The protective sleeve mechanism (1) also includes a protective grid sleeve (3), the thread of which is fitted onto the junction box (21), and the outer protective sleeve (12) is threaded onto the threaded joint (11).

3. The corrosion-resistant thermocouple according to claim 1, characterized in that, The inner casing (13) has a scraper (131) inside the bottom port. The scraper (131) is movably sleeved on the thermoelectric electrode (23). The inner wall of the scraper (131) is provided with an elastic scraper (132). The middle part of the elastic scraper (132) is provided with a through groove (133).

4. The corrosion-resistant thermocouple according to claim 3, characterized in that, The bottom surface of the scraper cylinder (131) is provided with a number of circularly distributed elastic scraper blades (134), each of which is arc-shaped and forms a hemispherical shape when they are closely packed together.

5. The corrosion-resistant thermocouple according to claim 4, characterized in that, Both the first elastic scraper (132) and each second elastic scraper (134) are made of elastomeric corrosion-resistant material.

6. The corrosion-resistant thermocouple according to claim 1, characterized in that, The outer wall of the base (15) is provided with a micro stepper motor. The main shaft of the micro stepper motor is connected to the rotating rod (16). The power supply of the micro stepper motor is provided by a battery externally mounted on the base (15).

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