Pipeline type molten salt anti-condensation liquid level meter

Abstract

The invention discloses a pipeline type molten salt anti-condensation liquid level meter which comprises a measuring body and a display instrument. The measuring body penetrates through the mounting plate and the heat insulation plate, the measuring end extends into the metal container, and the connecting end is externally connected with a display instrument. A through hole is formed in the side wall of the metal container, and a plurality of ceramic bases are arranged in the metal container and jointly define a measuring space. A plurality of groups of heating resistance wires are mounted on each ceramic base in a layered manner through a fixing assembly, and each group corresponds to one independent heating device and is connected through a connecting wire. By means of the resistance wire heating system which is integrated around the measuring space and can be independently controlled in a layered mode, a measuring area is directly, evenly and actively heated, molten salt is effectively prevented from being solidified around the measuring probe, continuous and accurate liquid level measurement is ensured, and good corrosion resistance and maintenance convenience are achieved.

Description

Technical Field

[0001] This invention relates to a pipeline-type molten salt anti-condensation level gauge. Background Technology

[0002] Molten salts are commonly used as heat storage and transfer media in fields such as concentrated solar power (CSP) and chemical engineering. Molten salts are liquid at high temperatures and have good thermal stability and heat transfer performance, but they solidify rapidly at temperatures below their freezing point.

[0003] Most existing molten salt level gauges utilize radar level gauges for level monitoring. However, there is no effective monitoring method for confined spaces or structures with complex piping. Furthermore, molten salt is prone to condensation at low temperatures, leading to the formation of a salt crust near the liquid level during use. The measuring probe in contact with the molten salt is susceptible to localized heat dissipation, causing the surrounding molten salt to solidify, thus blocking the measuring channel or encasing the probe, resulting in measurement distortion or failure and affecting the accuracy of the level gauge. In contrast, other resistance-type level gauges are prone to molten salt splashing during measurement, which can easily create salt layers in narrow gaps or on the surface of parts, further affecting the accuracy of the level gauge.

[0004] Therefore, there is an urgent need for a heating liquid level measurement device that can directly provide uniform, reliable, and adjustable heating liquid level in the measurement area. Summary of the Invention

[0005] The purpose of this invention is to provide a pipeline-type molten salt anti-condensation level gauge with a precisely controllable resistance wire heating system that effectively prevents molten salt from solidifying around the measuring probe.

[0006] The technical solution to achieve the purpose of this invention is as follows: This invention has a measuring body and a display instrument for displaying measurement results. The measuring body includes a measuring body and a display instrument. The measuring body has a measuring end and a connecting end. The display instrument is fixedly installed on the connecting end of the measuring body. It also includes a mounting plate, a heat insulation plate, a ceramic base, a heating resistance wire, a metal container, and a fixing assembly. One side of the heat insulation plate is fixedly installed on one side of the mounting plate. The container opening of the metal container is detachably fixedly installed on the other side of the heat insulation plate. Multiple through holes are provided through the side wall of the metal container to allow molten salt to enter. The middle of the heat insulation plate and the mounting plate are respectively provided with mounting holes through which the measuring body can pass. After passing through the mounting holes, the measuring body is fixedly installed in the mounting holes. The measuring end of the measuring body is located inside the metal container and extends towards the bottom plate of the metal container. The connecting end of the measuring body is located on the outside. The device comprises multiple ceramic bases, each disposed inside a metal container and extending along the container's direction. One end of each ceramic base is fixed to a heat insulation plate, while the other end extends towards the bottom of the metal container. These ceramic bases enclose a measurement space, within which the measuring end of the measuring body is located. Multiple sets of heatable resistance wires, evenly arranged along the container's direction, are detachably fixed to each ceramic base via fixing components. Each set of heatable resistance wires on each ceramic base is correspondingly positioned and located on the same horizontal plane. Furthermore, multiple heating devices, corresponding to each set of heatable resistance wires and used to heat them, are also provided. These heating devices are fixed to the other side of a mounting plate and integrated with connecting wires on the measuring body. One end of the connecting wire connects to the heating device, and the other end connects to the heatable resistance wire.

[0007] Furthermore, the metal container has two slots on its side wall at the container opening, symmetrically arranged around the axis of the metal container. The heat insulation plate has an insertion groove for the metal container opening. The groove wall has corresponding sliding grooves for the two slots. A plug-in block that can be inserted into the slot slides within the sliding groove. A return spring is also provided within the sliding groove; one end of the return spring is fixed to the bottom of the sliding groove, and the other end is fixed to the plug-in block. The plug-in block, through the spring force of the return spring and the sliding arrangement of the plug-in block, forms an insertion fit with the slot. The heat insulation... The plate is provided with a connecting groove that communicates with the slot and extends along the extension direction of the slot. A connecting block extending to the connecting groove is fixed on the plug. The connecting block is slidably disposed in the connecting groove. The plug disengages from the slot through the sliding engagement between the connecting block and the connecting groove, the sliding engagement between the plug and the sliding groove, and the compression of the reset spring by the plug. After the metal container is inserted into the mounting groove through the container opening of the metal container, the plug and the slot form a plug-in engagement and are fixed to the heat insulation plate. After the metal container disengages from the slot through the plug and the container opening of the metal container disengages from the mounting groove, it is detached from the heat insulation plate.

[0008] Furthermore, the insert block is provided with a guide slope, which is set on the end of the insert block that forms an insertion fit with the slot. One end of the guide slope extends toward the bottom of the mounting slot, and the other end of the guide slope extends toward the connecting slot. The slot can form an insertion fit with the insert block under the guidance of the guide slope after the metal container is inserted into the mounting slot.

[0009] Furthermore, the fixing component includes a locking block, a screw, and a nut. The locking block has a first locking groove, and the ceramic base has a second locking groove. Both ends of the locking block have a first connecting hole, and the ceramic base has a second connecting hole corresponding to the first connecting hole. Both the first and second connecting holes allow the screw to pass through. The locking block is detachably fixed to the ceramic base through the correspondence between the first and second connecting holes and the threaded engagement between the screw and the nut after the screw passes through the first and second connecting holes. The first and second locking grooves, through the detachable fixing of the locking block, form a restrictive space that can confine the heatable resistance wire. The heatable resistance wire is detachably fixed to the ceramic base through the detachable fixing connection between the locking block and the ceramic base.

[0010] Furthermore, there are two ceramic bases, with one side of one ceramic base fixedly connected to one side of the other ceramic base, forming a 90° angle between the two ceramic bases, and the measurement space is formed within the angle, with each set of heating resistance wires set inside the measurement space.

[0011] Furthermore, the heating resistance wires located on the same horizontal plane on each ceramic base are electrically connected to the same heating device through connecting wires, the surface of which is treated with anti-corrosion coating.

[0012] Furthermore, a positioning plate is fixedly provided on the measuring body. The positioning plate is set on the connecting end of the measuring body located on the outside. The positioning plate and the mounting plate are respectively provided with threaded holes, and bolts that can form a threaded engagement with the threaded holes are also provided. The measuring body is fixedly set in the mounting hole by the threaded engagement of the bolts with the threaded holes.

[0013] Furthermore, multiple through holes are arranged around the axis of the metal container to form a hole group. The hole group is provided in multiple groups, and each group of holes is evenly arranged on the outer wall of the metal container along the extension direction of the metal container. Each group of holes corresponds to each group of heating resistance wires.

[0014] Furthermore, the locking block, screw, and nut are all treated with anti-corrosion measures.

[0015] Furthermore, both the outer and inner surfaces of the metal container are treated with aluminizing or chromizing.

[0016] The present invention has positive effects: (1) The present invention arranges the heating resistance wire directly on the ceramic base surrounding the measuring probe. The heat is directly and uniformly radiated and conducted to the entire measuring space through the ceramic base with good thermal conductivity. The resistance wire is arranged in multiple layers along the height direction and can be independently temperature controlled for layered control. According to the actual working conditions, the heating power can be increased for the bottom or specific areas that are easy to dissipate heat, ensuring that the temperature of the entire measuring path from top to bottom is maintained above the solidification point of molten salt, completely eliminating the phenomenon of local solidification, and fundamentally ensuring the continuity and accuracy of the measurement.

[0017] (2) The present invention uses a metal container with an aluminizing or chromizing treatment on the surface as the first line of defense. The alloy layer formed on its surface can greatly resist the corrosion and erosion of molten salt. The interior uses an inert, high-temperature resistant ceramic material as a base, which constitutes the second line of defense. The heating resistance wire is sealed in a barrier made of corrosion-resistant metal and ceramic, which isolates it from the corrosive medium, significantly improving the reliability of the heating system and the service life of the overall device.

[0018] (3) The metal container and the heat insulation plate of the present invention adopt a spring-loaded quick-release structure, which can be disassembled and installed without tools or with only simple operation, making it easy to clean the inside of the container or inspect it; The resistance wire is fixed by a clip and screw assembly, and the clip can be removed by removing the nut to replace a single wire or a set of resistance wires without replacing the entire base or container. This modular design greatly simplifies the maintenance process and shortens downtime.

[0019] (4) The heat insulation plate of the present invention effectively blocks the transmission of high temperature inside the metal container to the mounting plate and external display instruments and junction boxes, protects external electronic components, and improves system safety; the overall structure is a pipe type, which is convenient for installation and integration on the side wall of the molten salt pipe or tank, and occupies little space.

[0020] (5) The layered design of the holes in this invention corresponds to the heating layer, which ensures the convection and temperature balance of the medium inside and outside each heating layer area, making the measurement closer to the real working conditions. It can be used for liquid level measurement of various easily solidified high-temperature media, and has a wide range of applications. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1 This is a schematic diagram of the installation structure of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is a schematic diagram of the mounting structure of the heat-generating resistance wire of the present invention; Figure 4This is a schematic diagram of the connection structure of the ceramic base of the present invention; Figure 5 for Figure 2 A magnified view of part A in the image.

[0022] In the diagram, the components are: 1 (measuring body), 11 (measuring end), 12 (connecting end), 13 (connecting wire), 14 (positioning plate), 1-1 (display instrument), 2 (mounting plate), 21 (heating device), 31 (heat insulation plate), 31 (mounting groove), 311 (sliding groove), 312 (insertion block), 3121 (connecting block), 3122 (guide slope), 313 (reset spring), 32 (connecting groove), 4 (ceramic base), 41 (second slot), 5 (heatable resistance wire), 6 (metal container), 61 (through hole), 62 (slot), 7 (fixing component), 71 (block), 711 (first slot), 72 (screw), 73 (nut), 8 (mounting hole), and 9 (measuring space). Detailed Implementation

[0023] See Figures 1 to 5 The present invention comprises a measuring body and a display instrument 1-1 for displaying measurement results. The measuring body includes a measuring body 1 and a display instrument 1-1. The measuring body 1 has a measuring end 11 and a connecting end 12. The display instrument 1-1 is fixedly mounted on the connecting end 12 of the measuring body 1. The invention also includes a mounting plate 2, a heat insulation plate 3, a ceramic base 4, a heating resistance wire 5, a metal container 6, and a fixing assembly 7. One side of the heat insulation plate 3 is fixedly mounted on one side of the mounting plate 2. The container opening of the metal container 6 is detachably fixedly mounted on the other side of the heat insulation plate 3. Multiple through holes 61 are provided through the side wall of the metal container 6 to allow molten salt to enter. The middle of the heat insulation plate 3 and the mounting plate 2 are respectively provided with mounting holes 8 through which the measuring body 1 can pass. The measuring body 1 is fixedly mounted in the mounting hole 8 after passing through the mounting hole 8. The measuring end 11 of the measuring body 1 is located inside the metal container 6 and extends toward the bottom plate of the metal container 6. The connecting end 12 of the measuring body 1 is located on the outside. Multiple ceramic bases 4 are provided, each set inside the metal container 6 and extending along the extension direction of the metal container 6. One end of each ceramic base 4 is fixedly mounted on the heat insulation plate 3, and the other end of each ceramic base 4 extends toward the bottom of the metal container 6. The ceramic bases 4 surround and form a measuring space 9, and the measuring end 11 of the measuring body 1 is located within the measuring space 9. Multiple sets of heatable resistance wires 5 are detachably fixed on each ceramic base 4 by fixing components 7, arranged uniformly along the extension direction of the ceramic base 4. Each set of heatable resistance wires 5 on each ceramic base 4 is arranged one-to-one and located on the same horizontal plane. Multiple heating devices 21 are also provided, each corresponding to one set of heatable resistance wires 5 and used to heat the heatable resistance wires 5. The heating devices 21 are fixedly mounted on the other side of the mounting plate 2 and are also integrated with connecting lines 13 on the measuring body 1. One end of the connecting line 13 is connected to the heating device 21, and the other end of the connecting line 13 is connected to the heatable resistance wire 5.

[0024] Two slots 62 are provided on the side wall of the container opening of the metal container 6. The two slots 62 are symmetrically arranged with the axis of the metal container 6 as the center. The heat insulation plate 3 has an installation groove 31 for the container opening of the metal container 6 to be inserted. The groove wall of the installation groove 31 has a sliding groove 311 corresponding to the two slots 62. The insertion block 312 that can be inserted into the slot 62 is slidably arranged in the sliding groove 311. A return spring 313 is also provided in the sliding groove. One end of the return spring 313 is fixedly arranged on the bottom of the sliding groove 311, and the other end of the return spring 313 is fixedly arranged on the insertion block 312. The insertion block 312 is inserted into the slot 62 by the elastic force of the return spring 313 and the sliding arrangement of the insertion block 312. The heat insulation plate 3 has a mounting groove 311 for inserting into the slot 62. A connecting groove 32 is provided that is connected to and extends along the extension direction of the slot 62. A connecting block 3121 extending to the connecting groove 32 is fixedly provided on the insert block 312. The connecting block 3121 is slidably disposed in the connecting groove. The insert block 312 disengages from the slot 62 through the sliding engagement between the connecting block 3121 and the connecting groove, the sliding engagement between the insert block 312 and the sliding groove 311, and the pressing of the insert block 312 against the return spring 313. After the metal container 6 is inserted into the mounting groove 31 through the container opening of the metal container 6, the insert block 312 and the slot 62 form an insertion engagement and are fixed to the heat insulation plate 3. After the metal container 6 disengages from the slot 62 through the insertion block 312 and the container opening of the metal container 6 disengages from the mounting groove 31, it is detached from the heat insulation plate 3.

[0025] The insert 312 is provided with a guide slope 3122, which is located on the end of the insert 312 that forms an insertion fit with the slot 62. One end of the guide slope 3122 extends toward the bottom of the mounting groove 31, and the other end of the guide slope 3122 extends toward the connecting groove 32. The slot 62 can form an insertion fit with the insert 312 after the container opening of the metal container 6 is inserted into the mounting groove 31 and guided by the guide slope 3122.

[0026] The fixing component 7 includes a locking block 71, a screw 72, and a nut 73. The locking block 71 has a first locking groove 711, and the ceramic base 4 has a second locking groove 41. Both ends of the locking block 71 have a first connecting hole 61, and the ceramic base 4 has a second connecting hole 61 corresponding to the first connecting hole 61. Both the first connecting hole 61 and the second connecting hole 61 allow the screw 72 to pass through. The locking block 71 is detachably fixed to the ceramic base 4 through the correspondence between the first connecting hole 61 and the second connecting hole 61, and the screw 72 is threadedly engaged with the nut 73 after passing through the first connecting hole 61 and the second connecting hole 61. The first locking groove 711 and the second locking groove 41, through the detachable fixing of the locking block 71, form a restrictive space that can confine the heatable resistance wire 5. The heatable resistance wire 5 is detachably fixed to the ceramic base 4 through the detachable fixed connection between the locking block 71 and the ceramic base 4.

[0027] Two ceramic bases 4 are provided. One side of one ceramic base 4 is fixedly connected to one side of the other ceramic base 4, and the two ceramic bases 4 form a 90° angle. The measurement space 9 is formed within the angle, and each set of heating resistance wires 5 is set inside the measurement space 9.

[0028] Each ceramic base 4 has a heating resistance wire 5 located on the same horizontal plane that is electrically connected to the same heating device 21 through a connecting line 13, the surface of which is treated with anti-corrosion.

[0029] A positioning plate 14 is fixedly provided on the measuring body 1. The positioning plate 14 is set on the connecting end 12 of the measuring body 1 located on the outside. The positioning plate 14 and the mounting plate 2 are respectively provided with threaded holes, and bolts that can form a threaded engagement with the threaded holes are also provided. The measuring body 1 is fixedly set in the mounting hole 8 by the threaded engagement of the bolts with the threaded holes.

[0030] Multiple through holes 61 are arranged around the axis of the metal container 6 to form a hole group. The hole group is provided in multiple groups, and each group of holes is evenly arranged on the outer wall of the metal container 6 along the extension direction of the metal container 6. Each group of holes is arranged in a one-to-one correspondence with each group of heating resistance wires 5.

[0031] The locking block 71, screw 72, and nut 73 are all treated with anti-corrosion measures.

[0032] The above structure is divided into structural assembly and heating system; Structural Assembly: Mounting plate 2 is used to fix the entire level gauge to an external support structure or pipeline. One side of the heat insulation plate 3 is fixed to one side of the mounting plate 2 by bolts. The other side of the heat insulation plate 3 is provided with a mounting groove 31. The container opening of the metal container 6 is inserted into the mounting groove 31 and is detachably fixed by a quick locking mechanism consisting of a plug 312, a return spring 313, etc. On the cylindrical side wall of the metal container 6, multiple sets of through holes 61 are evenly distributed along the height direction. Each set of through holes 61 is evenly distributed along the circumference, allowing molten salt to flow freely into and out of the container. Two ceramic bases 4 are fixed to the other side of the heat insulation plate 3 by high-temperature adhesive or mechanical means and are located inside the metal container 6. The two ceramic bases 4 are perpendicular to each other and are fixedly connected by ceramic adhesive, so that the two main parts form a 90° angle between them, thereby forming a cylindrical measuring space 9 extending along the height inside the angle. The measuring body 1 may contain suitable liquid level measuring units such as radar waveguide rods, capacitive sensing elements, and ultrasonic probes. The measuring body 1 passes through the mounting hole 8 coaxial with the center of the mounting plate 2 and the heat insulation plate 3, and is fixed to the mounting plate 2 by bolts through the positioning plate 14 on its connecting end 12. The measuring end 11 of the measuring body 1 extends exactly into the aforementioned measuring space 9 and points to the bottom of the metal container 6. The display instrument 1-1 is fixed to the connecting end 12 of the measuring body 1 and is used to display and process the measurement signal.

[0033] Heating System: Multiple second slots 41 are evenly provided along the height direction on the inner side plane of each ceramic base 4 facing the measuring space 9. The heating resistance wire 5 is installed in these slots by a fixing component 7, which includes a locking block 71, a screw 72, and a nut 73. The locking block 71 has a first slot 711 corresponding to the second slot 41. During installation, a section of the heating resistance wire 5 is placed into the second slot 41 of the ceramic base 4, and then the locking block 71 is closed, so that the resistance wire is wrapped in the restricted space formed by the first slot 711 and the second slot 41. Next, the screw 72 is passed through the first connecting hole 61 on the locking block 71 and the second connecting hole 61 on the ceramic base 4 in sequence, and finally the nut 73 is tightened to firmly clamp the resistance wire on the ceramic base 4. The locking block 71, screw 72, and nut 73 are preferably made of heat-resistant and corrosion-resistant materials such as 310S stainless steel. Multiple heating devices 21 are fixed on the mounting plate 2. The heating devices 21 may be power modules controlled by solid-state relays or integrated temperature controllers. One end of the connecting wire 13 integrated on the outside of the measuring body 1 is connected to the heating device 21, and the other end is connected to the corresponding heating resistance wire 5. The connecting wire 13 has a high-temperature resistant and corrosion-resistant outer layer. All heating resistance wires 5 on the ceramic base 4 that are at the same horizontal level, i.e., the same layer, are connected to the same heating device 21 in parallel or series. This allows for independent control and heating of each layer. For example, when the temperature at the bottom is detected to be too low, the heating power of the lower layer resistance wire can be increased separately.

[0034] The working principle of this invention is as follows: The assembled level gauge is installed on the side wall or pipe of the molten salt storage tank via the mounting plate 2, so that the metal container 6 is immersed in the molten salt. The molten salt enters the interior of the metal container 6 through the through holes 61 of each layer, fills the container and communicates with the environment outside the measuring space 9. The measuring end 11 of the measuring body 1 measures the liquid level in the measuring space 9 and the signal is transmitted to the display instrument 1-1.

[0035] Before or during operation, the heating device 21 heats each layer of heatable resistance wire 5. The heat is directly conducted through the ceramic base 4 to the measuring space 9 and the surrounding metal container 6, maintaining the temperature of this area above the freezing point of the molten salt. This effectively prevents the salt from solidifying around the measuring end 11 of the measuring body 1, ensuring accurate and continuous level measurement. The heat insulation plate 3 reduces heat transfer to the mounting plate 2 and the instruments behind it.

[0036] When it is necessary to replace the resistance wire or clean the inside of the metal container 6, it is not necessary to remove the entire level gauge. Simply use a tool to move the two connecting blocks 3121 through the connecting groove 32, causing the insert block 312 to compress the return spring 313 and exit from the slot 62, so that the entire metal container 6 can be removed from the heat insulation plate 3. After exposing the inside, the nut 73 can be loosened further, the retaining block 71 can be removed, and the damaged resistance wire can be replaced. After maintenance, the metal container 6 is reinstalled. During the insertion process, the edge of the container opening contacts the guide slope 3122 of the insert block 312, automatically pressing it in until the slot 62 is aligned. Then, the insert block 312 springs into the slot 62 under the action of the return spring 313 to complete the locking.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipeline type molten salt anti-condensation liquid level gauge, having a measuring body and a display instrument (1-1) for displaying measurement results, the measuring body comprising a measuring body (1) and the display instrument (1-1), the measuring body (1) having a measuring end (11) and a connecting end (12), and the display instrument (1-1) being fixedly arranged on the connecting end (12) of the measuring body (1); characterized in that: It also includes an installation plate (2), a heat insulation plate (3), a ceramic base (4), a heating resistance wire (5), a metal container (6), and a fixing component (7). One side of the heat insulation plate (3) is fixedly installed on one side of the installation plate (2). The container opening of the metal container (6) is detachably fixed on the other side of the heat insulation plate (3). Multiple through holes (61) are provided through the side wall of the metal container (6) to allow molten salt to enter the interior. The middle of the heat insulation plate (3) and the installation plate (2) are respectively provided with mounting holes (8) through which the measuring body (1) can pass. After the measuring body (1) passes through the mounting hole (8), it is fixedly installed in the mounting hole (8). The measuring end (11) of the measuring body (1) is located inside the metal container (6) and extends toward the bottom plate of the metal container (6). The connecting end (12) of the measuring body (1) is located outside. The ceramic base (4) is provided in multiple ways. Each ceramic base (4) is set inside the metal container (6) and extends along the extension direction of the metal container (6). One end of each ceramic base (4) is fixed on the heat insulation plate (3), and the other end of each ceramic base (4) extends toward the bottom of the metal container (6). Each ceramic base (4) surrounds and forms a measurement space (9). The measuring end (11) of the measuring body (1) is located in the measurement space (9). Each ceramic base (4) is detachably fixed with multiple sets of extensions along the ceramic base (4) by fixing components (7). The heating resistance wires (5) are arranged in a uniform direction. Each group of heating resistance wires (5) on each ceramic base (4) is arranged in a corresponding manner and located on the same horizontal plane. There are also multiple heating devices (21) that are arranged in a corresponding manner to each group of heating resistance wires (5) and are used to heat the heating resistance wires (5). The heating devices (21) are fixedly arranged on the other side of the mounting plate (2) and are also integrated into the measuring body (1) with connecting wires (13). One end of the connecting wires (13) is connected to the heating device (21), and the other end of the connecting wires (13) is connected to the heating resistance wires (5).

2. A pipe-type molten salt anti-condensation liquid level gauge according to claim 1, characterized in that: Two slots (62) are provided on the side wall of the container opening of the metal container (6). The two slots (62) are symmetrically arranged with the axis of the metal container (6) as the center. The heat insulation plate (3) has an installation groove (31) for the metal container (6) to be inserted into. The groove wall of the installation groove (31) is provided with a sliding groove (311) corresponding to the two slots (62). A plug (312) that can be inserted into the slot (62) is slidably arranged in the sliding groove (311). A return spring (313) is also provided in the sliding groove. One end of the return spring (313) is fixedly arranged on the bottom of the sliding groove (311), and the other end of the return spring (313) is fixedly arranged on the plug (312). The plug (312) is inserted into the slot (62) by the elastic force of the return spring (313) and the sliding arrangement of the plug (312). The heat insulation plate (3) is provided with a mounting groove (311) for the slot (62) to be inserted into the slot (62). 2) A connecting groove (32) is provided and extends along the extension direction of the slot (62). A connecting block (3121) extending to the connecting groove (32) is fixed on the plug (312). The connecting block (3121) is slidably disposed in the connecting groove. The plug (312) disengages from the slot (62) through the sliding fit between the connecting block (3121) and the connecting groove, the sliding fit between the plug (312) and the sliding groove (311), and the pressing of the plug (312) against the reset spring (313). After the metal container (6) is inserted into the mounting groove (31) through the container opening of the metal container (6), the plug (312) and the slot (62) form a plug-in fit and are fixed to the heat insulation plate (3). After the metal container (6) disengages from the slot (62) through the plug (312) and the container opening of the metal container (6) disengages from the mounting groove (31) and is fixed to the heat insulation plate (3).

3. A pipe-mounted molten salt anti-priming level gauge according to claim 2, characterized in that: The insert (312) is provided with a guide slope (3122). The guide slope (3122) is located on the end of the insert (312) that forms an insertion fit with the slot (62). One end of the guide slope (3122) extends toward the bottom of the mounting groove (31), and the other end of the guide slope (3122) extends toward the connecting groove (32). The slot (62) can form an insertion fit with the insert (312) under the guidance of the guide slope (3122) after the container opening of the metal container (6) is inserted into the mounting groove (31).

4. A fused salt anti -freeze level gauge of the pipe type according to claim 1, characterized in that: The fixing component (7) includes a locking block (71), a screw (72), and a nut (73). The locking block (71) has a first locking groove (711), and the ceramic base (4) has a second locking groove (41). Both ends of the locking block (71) have a first connecting hole (61), and the ceramic base (4) has a second connecting hole (61) corresponding to the first connecting hole (61). Both the first connecting hole (61) and the second connecting hole (61) allow the screw (72) to pass through. The locking block (71) connects with the screw (72) through the first connecting hole (61). The two connecting holes (61) correspond to each other and the screw (72) is detachably fixed to the ceramic base (4) after passing through the first connecting hole (61) and the second connecting hole (61) and the nut (73) threadedly engaged. The first slot (711) and the second slot (41) are formed by the detachable fixing of the locking block (71) to form a restricted space that can restrict the heating resistance wire (5). The heating resistance wire (5) is detachably fixed to the ceramic base (4) through the locking block (71).

5. A pipe-melted salt anti-condensation level gauge according to claim 1, characterized in that: The ceramic base (4) is provided in two. One side of one ceramic base (4) is fixedly connected to one side of the other ceramic base (4). The two ceramic bases (4) form a 90° angle, and the measurement space (9) is formed within the angle. Each set of heating resistance wires (5) is set inside the measurement space (9).

6. A pipe-mounted molten salt anti-priming level gauge according to claim 1, characterized in that: Each ceramic base (4) has a heating resistance wire (5) located on the same horizontal plane and is electrically connected to the same heating device (21) through a connecting wire (13), the surface of which is treated with anti-corrosion.

7. A pipe-mounted molten salt anti-priming level gauge according to claim 1, characterized in that: The measuring body (1) is fixedly provided with a positioning plate (14), which is located on the connecting end (12) of the measuring body (1) located outside. The positioning plate (14) and the mounting plate (2) are respectively provided with threaded holes, and bolts that can form a threaded fit with the threaded holes are also provided. The measuring body (1) is fixedly installed in the mounting hole (8) by the threaded fit of the bolts and the threaded holes.

8. A pipe-mounted molten salt anti-priming level gauge according to claim 1, characterized in that: Multiple through holes (61) are formed around the axis of the metal container (6) to form a hole group. The hole group is provided in multiple groups. Each group of holes is evenly arranged on the outer wall of the metal container (6) along the extension direction of the metal container (6). Each group of holes is arranged in a one-to-one correspondence with each group of heating resistance wires (5).

9. A pipe-mounted molten salt anti-priming level gauge according to claim 4, characterized in that: The aforementioned card block (71), screw (72) and nut (73) are all treated with anti-corrosion measures.

10. A fused salt anti -freeze level gauge of the pipe type according to claim 1, characterized in that: The outer and inner surfaces of the metal container (6) are both treated with aluminum or chromium.

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