Side-mounted liquid level meter electric heat tracing device

Abstract

The utility model provides a side-mounted liquid level meter electric heat tracing device which comprises an electric heat tracing jacket wrapping the outside of a liquid level meter body, a first electric heat tracing belt arranged in the jacket, a second electric heat tracing belt arranged on the surface of an upper liquid level isolation valve and the surface of a lower liquid level isolation valve through an electric heat tracing winding strip, and a power junction box arranged on the electric heat tracing jacket. And the power supply junction box is electrically connected with the first and second electric tracing bands to form an integrated power supply system. The heat tracing range is extended to the liquid level isolation valve and the connecting pipeline through the second electric heat tracing belt capable of being wound, the problem of heat tracing blind areas in a traditional scheme is effectively solved, it is ensured that the liquid level meter is accurate and reliable in measurement in the low-temperature environment, and meanwhile the liquid level meter has the advantages of being compact in structure, convenient and fast to install and unified in appearance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial instrument heat tracing, and particularly relates to a side-mounted liquid level meter electric heat tracing device. BACKGROUND

[0002] The side-mounted liquid level meter is an industrial instrument based on the principle of communicating vessels, and is widely applied to liquid level measurement in the petroleum, chemical, and power industries. The instrument is connected to the side wall of a container through upper and lower flanges, so that the medium enters the liquid level meter body, and then the in-situ indication or remote detection of the liquid level is realized.

[0003] In the related technical solution, an isolation valve is usually arranged on the connecting pipeline between the liquid level meter and the equipment for the convenience of maintenance. In order to prevent the medium from freezing in a low-temperature environment, the side-mounted liquid level meter is usually equipped with an electric heat tracing jacket to heat and keep warm the instrument body and the adjacent flange area.

[0004] However, since the liquid level isolation valve does not belong to the liquid level meter body supply range, the pipe section between the equipment connection flange and the liquid level meter flange is outside the coverage range of the electric heat tracing jacket, forming a heat tracing blind area. The medium in this section of pipeline is in a static state and is prone to freezing in a low-temperature condition, which destroys the measuring condition of the communicating vessel and causes the liquid level meter to fail to work normally. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a side-mounted liquid level meter electric heat tracing device to solve the technical problem that the electric heat tracing jacket of the liquid level meter body does not cover the isolation valve and the connecting pipeline, resulting in freezing of the medium in a low-temperature environment and destruction of the communicating pipe structure.

[0006] The present application provides a side-mounted liquid level meter electric heat tracing device, comprising:

[0007] An electric heat tracing jacket is wrapped outside the body of the liquid level meter, and the electric heat tracing jacket is provided with a first connecting part and a second connecting part extending radially at the axial two ends, respectively; the first connecting part and the second connecting part are used for being connected to the process equipment through the upper liquid level isolation valve and the lower liquid level isolation valve, respectively;

[0008] A first electric heat tracing belt is arranged inside the electric heat tracing jacket and is used for heat tracing the liquid level meter;

[0009] A second electric heat tracing belt is wound on the surface of the upper liquid level isolation valve and the lower liquid level isolation valve by an electric heat tracing winding strip;

[0010] A power supply junction box is arranged on the electric heat tracing jacket and is electrically connected with the first electric heat tracing belt and the second electric heat tracing belt.

[0011] In a possible implementation, one end of the upper liquid level isolation valve is connected with the first connecting part through a first upper flange, and the other end is connected with a first connecting pipe of the process equipment through a second upper flange.

[0012] One end of the lower liquid level isolation valve is connected with the second connecting part through a first lower flange, and the other end is connected with a second connecting pipe of the process equipment through a second lower flange.

[0013] In a possible implementation, the electric heat tracing winding strip includes a strip-shaped cloth tape and a hook-and-loop tape, the second electric heat tracing tape is embedded in the strip-shaped cloth tape, and the second electric heat tracing tape extends along the axial direction of the strip-shaped cloth tape.

[0014] The hook-and-loop tape is arranged at the edge of the strip-shaped cloth tape, and is used for winding the strip-shaped cloth tape on the surface of the first upper flange, the upper liquid level isolation valve, the second upper flange, the first lower flange, the lower liquid level isolation valve, and the second lower flange.

[0015] In a possible implementation, the hook-and-loop tape includes a first adhesive part arranged on one side of the strip-shaped cloth tape, and a second adhesive part arranged on the other side, and the first adhesive part and the second adhesive part can be adhered to each other.

[0016] In a possible implementation, the first adhesive part is a hook surface, and the second adhesive part is a loop surface.

[0017] In a possible implementation, the strip-shaped cloth tape has a wave-shaped cross section in the axial direction, and the second electric heat tracing tape is embedded in the groove of the wave-shaped cross section.

[0018] In a possible implementation, the second electric heat tracing tape is arranged along the middle axis of the strip-shaped cloth tape, and the tail end of the second electric heat tracing tape is flushly fixed with the tail end of the strip-shaped cloth tape.

[0019] In a possible implementation, the strip-shaped cloth tape is a high-thermal-conductivity carbon fiber cloth strip.

[0020] In a possible implementation, the first electric heat tracing tape is arranged along the axial direction of the liquid level meter.

[0021] The side part of the first electric heat tracing tape is provided with an extension section extending to the outside of the electric heat tracing jacket at positions corresponding to the first connecting part and the second connecting part.

[0022] In a possible implementation, the power supply junction box is an explosion-proof power supply junction box, and a plurality of electric heat tracing tape wiring ports are reserved on the power supply junction box.

[0023] Compared with the prior art, the application has at least the following beneficial effects:

[0024] The second electric heat tracing band of the application is directly wound on the surface of the upper and lower liquid level isolation valves through the electric heat tracing winding strip. Compared with the heat tracing blind area formed by only tracing the liquid level meter body in the related art, the application can actively extend the heat tracing range and completely cover the key pipe valve connecting piece, thereby realizing full-range and uniform heat tracing of the liquid level meter measuring system and fundamentally avoiding liquid level measurement failure caused by medium solidification in the area.

[0025] Since the power connection box is arranged on the electric heat tracing jacket and is electrically connected with the first and second electric heat tracing bands at the same time, centralized power supply and unified control of the liquid level meter body and the connecting valve are realized. Compared with the scheme of separately adding a heat tracing circuit and independently wiring the blind area, the application significantly simplifies the system structure and external wiring, reduces construction interfaces and engineering quantity, and improves system integration and reliability.

[0026] Since the electric heat tracing winding strip can be flexibly and detachably wound on the valve surface, the device can adapt to valve installation environments of different sizes and spatial positions, realize close fitting and quick assembly and disassembly. Compared with the method of directly winding the electric heat tracing band on site, the application ensures the standardization and consistency of heat tracing construction, and the installation quality is not affected by human factors, the appearance is neat and uniform, and subsequent maintenance is facilitated.

[0027] The application realizes the convenience of installation, the simplicity of maintenance and the economy of the overall scheme while ensuring stable and reliable operation of the side-mounted liquid level meter in a low-temperature environment, and has good engineering application value. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0029] Figure 1 is a structural schematic diagram of an embodiment of the application;

[0030] Figure 2 is a use state diagram of an embodiment of the application;

[0031] Figure 3 is a structural schematic diagram of an electric heat tracing winding strip of an embodiment of the application Figure 1 ;

[0032] Figure 4 is a structural schematic diagram of an electric heat tracing winding strip of an embodiment of the application Figure 2 ;

[0033] Figure 5Structure diagram of the electric heat tracing winding strip of the embodiment of the present application Figure 3 .

[0034] Explanation of reference numerals:

[0035] 100, electric heat tracing jacket; 110, first connecting part; 120, second connecting part; 200, liquid level meter; 300, upper liquid level isolation valve; 310, first upper flange; 320, second upper flange; 400, lower liquid level isolation valve; 410, first lower flange; 420, second lower flange; 500, process equipment; 510, first connecting pipe; 520, second connecting pipe; 600, first electric heat tracing belt; 700, second electric heat tracing belt; 800, electric heat tracing winding strip; 810, strip-shaped cloth tape; 820, hook-and-loop fastener; 821, first adhesive part; 822, second adhesive part; 900, power supply junction box; 910, electric heat tracing belt junction port.

[0036] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] First, the terms involved in the present application are explained:

[0039] Side-mounted liquid level meter: a type of measuring instrument for indicating the liquid level height in various towers, tanks, troughs, spherical vessels and boilers and other equipment, including but not limited to magnetic flip plate (column) liquid level meter, glass plate liquid level meter, magnetostrictive liquid level meter, outer float liquid level meter, etc. This type of liquid level meter is rigidly connected to the instrument root valve of the upper and lower flange ports on the side of the equipment, forming a communication pipe to play the role of external observation and internal liquid level conduction of the equipment. The side-mounted liquid level meter can indicate or remotely measure the liquid level height in the measuring container.

[0040] Liquid level meter isolation valve: It is a transition connecting piece between the side-mounted liquid level meter and the equipment, an isolation component when the liquid level meter is inspected and maintained, and a support for the liquid level meter. It plays a very important role in the normal liquid level detection of the equipment. The instrument root valve cuts off the process medium. When the side-mounted liquid level meter needs to be maintained or the equipment needs to be cleaned, the instrument root valve can be cut off to realize the stripping of the liquid level meter.

[0041] Instrument electric heat tracing system: When the medium in the instrument pipeline is water, steam, condensate and other materials that are easy to condense, the instrument equipment that needs to be heat traced is arranged outside the building. In winter and days with low ambient temperature, in order to ensure the normal use of the instrument, a heating anti-freezing system using power supply as the heating mode is adopted.

[0042] Velcro: It is composed of two-sided hook and loop structures. One side is fine and soft fiber, and the other side is hard hook and loop that are pasted together to generate natural adhesion. It can be separated naturally by pulling with hands, which is commonly known as magic tape.

[0043] As described in the background, the side-mounted liquid level meter in the related art has a measurement failure problem in a low-temperature environment. The main reason for this problem is that the conventional electric heat tracing scheme only heats the liquid level meter body, and the liquid level isolation valve and the connecting pipeline between the liquid level meter body and the process equipment form a heat tracing blind area. When the ambient temperature is lower than the freezing point of the medium, the static medium in this area will freeze first, which destroys the continuous liquid column required by the principle of the connected vessel, thereby causing the liquid level measurement to fail.

[0044] The embodiment of the present application solves the above technical problem by extending the heat tracing structure. Specifically, on the basis of including an electric heat tracing jacket for heating the liquid level meter body and a first electric heat tracing belt, the second electric heat tracing belt and the electric heat tracing winding strip are additionally provided. When the liquid level meter is working normally, the first electric heat tracing belt ensures that the liquid level meter body is maintained at the working temperature. At the same time, the second electric heat tracing belt directly winds on the surfaces of the upper and lower liquid level isolation valves through the electric heat tracing winding strip, and the key blind area is heated in a targeted manner.

[0045] The core discovery of the present application is that the integrity of heat transfer is the key to preventing the medium from freezing. The heat generated by the traditional heat tracing jacket cannot be effectively radiated to the blind area, while the flexible contact heat tracing of the electric heat tracing winding strip in the present application establishes a continuous heat channel from the liquid level meter body to the connecting valve. When the ambient temperature decreases, this extended heat tracing structure can ensure that the temperature is uniformly distributed on the entire measurement path, eliminating local low-temperature points, thereby maintaining the liquid state of the medium and ensuring the continuity and accuracy of the liquid level measurement.

[0046] In addition, by integrating the power junction box on the electric heat tracing jacket and electrically connecting it with the first and second electric heat tracing bands, the integrated power supply for the entire heat tracing system is realized. This design not only simplifies the installation process, reduces external wiring points and potential failure points, but also improves the reliability and aesthetics of the system, facilitating standardized construction and maintenance on site.

[0047] In summary, the present application fundamentally solves the heat tracing blind area problem of the side-mounted liquid level meter through structural innovation of extending heat tracing, ensuring measurement reliability in low-temperature environments while improving the integration and engineering applicability of the system.

[0048] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes may not be described again in some examples. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0049] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , a side-mounted liquid level meter electric heat tracing device of the present application includes an electric heat tracing jacket 100, a first electric heat tracing band 600, a second electric heat tracing band 700, and a power junction box 900. The electric heat tracing jacket 100 is wrapped around the body of the liquid level meter 200. The electric heat tracing jacket 100 has a first connecting portion 110 and a second connecting portion 120 extending radially at both axial ends, respectively. The first connecting portion 110 and the second connecting portion 120 are used to connect to the process equipment 500 through the upper liquid level isolation valve 300 and the lower liquid level isolation valve 400, respectively. The first electric heat tracing band 600 is arranged inside the electric heat tracing jacket 100 and is used to heat trace the liquid level meter 200. The second electric heat tracing band 700 is wound around the surfaces of the upper liquid level isolation valve 300 and the lower liquid level isolation valve 400 through the electric heat tracing winding strip 800. The power junction box 900 is arranged on the electric heat tracing jacket 100 and is electrically connected with the first electric heat tracing band 600 and the second electric heat tracing band 700.

[0050] In this embodiment, the electric heat tracing jacket 100 is made of a high-temperature-resistant and corrosion-resistant composite insulation material. The outer layer is a rain and fireproof protective cover, and the overall structure is a wrapped type. It is suitable for the body size of mainstream side-mounted liquid level meters such as magnetic flapper and glass plate liquid level meters. The axial length is designed to be 500-1500mm according to the body specifications of the liquid level meter 200. The first connecting portion 110 and the second connecting portion 120 at both axial ends of the electric heat tracing jacket 100 are annular flange structures. The inner diameter matches the body flange of the liquid level meter 200, and the outer diameter extends to the isolation valve connecting end face, ensuring that the connection transition with the isolation valve has no heat leakage.

[0051] Exemplary, the electric heat tracing jacket 100 is divided into two halves, which are connected by a hinge and can be opened and closed. After wrapping the body of the liquid level meter 200, the two sides are fastened by stainless steel buckles. The inner wall of the jacket is tightly fitted with the body of the liquid level meter 200. If the body of the liquid level meter 200 has a protruding structure, such as a magnetic flap indicating window, the corresponding position of the jacket is reserved with an adaptive groove to ensure the overall fit.

[0052] In this embodiment, the first electric heat tracing band 600 is a self-limiting temperature electric heat tracing band, which is uniformly laid along the internal axis of the electric heat tracing jacket 100, and is tightly fitted with the surface of the body of the liquid level meter 200. The first electric heat tracing band 600 is fixed by high-temperature adhesive tape to avoid displacement. The two ends of the first electric heat tracing band 600 are reserved with 100-150mm wiring length to facilitate connection with the power supply junction box 900.

[0053] In this embodiment, the second electric heat tracing band 700 is of the same self-limiting temperature type as the first electric heat tracing band 600 to ensure consistency in temperature control. The electric heat tracing winding strip 800 is a flexible modular structure. The second electric heat tracing band 700 is embedded in the middle axis position of the winding strip, with a distance of ≥10mm from the edge of the winding strip. The edges of the front and back surfaces of the winding strip are symmetrically provided with 10mm wide sticky tape to realize quick fixing and detachable adjustment after winding.

[0054] The existing side-mounted liquid level meter electric heat tracing system does not cover the isolation valve and connecting pipe, resulting in freezing of the medium in low temperature environment, damaging the structure of the liquid level meter connecting pipe, and affecting the measurement accuracy. The present application extends the heat tracing path of the body electric heat tracing jacket through the flexible electric heat tracing winding strip and the sticky tape fixing structure, covering the isolation valve and the connecting pipe. The electric heat tracing winding strip 800 is wrapped with a high-thermal-conductivity carbon fiber cloth and a self-limiting temperature electric heat tracing band. The sticky tape is used for winding and fixing.

[0055] The flexible design of the electric heat tracing winding strip 800 enables it to tightly fit the surface of isolation valves and connecting pipes of different diameters and shapes, ensuring full coverage of the heat tracing area. The sticky tape firmly fixes the winding strip on the target surface through the hook surface and the adhesive principle of the fuzzy surface, avoiding the local heat tracing failure caused by loosening in the traditional winding method. The combination of the high-thermal-conductivity carbon fiber cloth and the self-limiting temperature electric heat tracing band maintains the temperature in the heat tracing area above the anti-freezing threshold through the heat conduction performance and self-limiting temperature characteristics of the materials themselves, eliminating the heat tracing blind area. This technical means solves the problem of freezing of the medium in low temperature environment, guarantees the integrity of the structure of the liquid level meter connecting pipe, and thus ensures the continuity and accuracy of the liquid level measurement.

[0056] In this embodiment, the power supply junction box 900 adopts a three-proof type (rainproof, dustproof, and corrosion-proof) or an explosion-proof type shell (selected according to the explosion-proof grade requirement of the industrial scene), which is fixed to the middle outer side of the electric heat tracing jacket 100 and is fastened to the jacket flange by bolts. The junction box is internally integrated with multiple wiring terminals, is equipped with a 220VAC power supply wiring gland interface, is reserved with 1-2 extension ports, and supports subsequent addition of heat tracing branches.

[0057] The existing electric heat tracing system needs to separately lay electric heat tracing bands to the isolation valve and the connecting pipe, the construction steps are complex, rely on manual operation, and lead to long installation period and unstable quality. The power junction box 900 integrates multiple electric heat tracing circuits, supports on-site expansion access to the electric heat tracing winding strip 800 through the reserved electric heat tracing band connection port. The power junction box 900 is designed in an integrated manner with the body electric heat tracing jacket, and realizes prefabricated installation.

[0058] The multi-port design of the power junction box 900 allows flexible expansion of the number of electric heat tracing winding strips 800 according to the on-site demand, without the need for additional layout of independent electric heat tracing circuits, reducing the construction interface and the amount of cables. The integrated design preinstalls the electric heat tracing jacket 100 and the power junction box 900 as a standardized component, avoiding complex on-site wiring operation and shortening the installation period. This technical means significantly reduces the construction difficulty, improves the installation efficiency, and ensures the consistency of the construction quality, thereby reducing the risk of heat tracing failure caused by manual operation differences.

[0059] For example, the electric heat tracing jacket 100 has completed preinstallation with the liquid level meter 200 before leaving the factory: the body of the liquid level meter 200 is wrapped by the flexible property of the jacket itself, the first electric heat tracing band 600 is fixed to the body of the liquid level meter 200, the heat preservation material is filled and compacted, and the first connecting part 110 and the second connecting part 120 at both ends are pre-fixed with the flanges of the body of the liquid level meter 200. The power junction box 900 is integrally formed with the jacket and does not need to be fixed by bolts on site. During transportation, the integrated product can be folded and stored, reducing the transportation volume. During on-site installation, only the flange surfaces of the jacket connecting parts at both ends and the upper and lower liquid level isolation valves 300 and 400 need to be fastened by bolts, and the main body installation can be completed. The electric heat tracing winding strip 800 is wrapped around the valve body and the connecting flanges at both ends of the upper and lower liquid level isolation valves 300 and 400 by means of a hook-and-loop fastener, the overlapping width of the winding is ≥20mm, and no coverage gap is ensured.

[0060] The two ends of the first electric heat tracing band 600 are connected to the body heat tracing circuit terminal of the power junction box 900 before leaving the factory, and no additional wiring is needed on site. The lead-out wire of the second electric heat tracing band 700 is pre-laid along the edge of the winding strip, and the end is provided with a quick connector. On site, only the quick connector needs to be inserted into the reserved port of the power junction box 900, and the circuit connection can be completed. The two heat tracing circuits have a parallel relationship preset inside the junction box, are powered by the same power supply, and realize synchronous start-stop control.

[0061] Based on the core logic of zoned heat tracing and unified control, through the temperature self-adaptive property of self-limiting temperature electric heat tracing, full-path freeze protection is realized, and the working process is as follows:

[0062] Power supply start: after the power supply junction box 900 is connected to the 220VAC industrial power supply, the electric energy is transmitted to the first electric heating tape 600 and the second electric heating tape 700 simultaneously, and the two-way electric heating tapes start heating at the same time.

[0063] Partition heating: the first electric heating tape 600 is attached to the liquid level meter body, and the temperature of the liquid level meter body is maintained at 10-40°C through the self-limiting temperature characteristic. The heat is quickly transmitted through the flexible high-thermal-conductivity carbon fiber cloth jacket, and the internal heat preservation material is used to reduce heat loss, so that the internal medium (water, condensate, etc.) of the body is kept in a flowing state and does not freeze or condense.

[0064] The second electric heating tape 700 quickly transmits heat to the valve body and the connecting part of the upper liquid level isolation valve 300 and the lower liquid level isolation valve 400 through the electric heating winding strip 800 (high-thermal-conductivity carbon fiber cloth) of the same material, eliminates the traditional heating blind area, maintains the internal medium temperature of the isolation valve above the anti-freezing threshold, and ensures the integrity of the connecting pipe structure.

[0065] Self-adaptive adjustment: when the ambient temperature rises, the resistance of the electric heating tape automatically increases, and the heating power decreases. When the ambient temperature decreases, the resistance decreases, and the power increases. No additional temperature control device is needed to realize self-adaptive stable control of the temperature and avoid local overheating or insufficient heating.

[0066] Maintenance adaptation: the Velcro design of the electric heating winding strip 800 allows quick disassembly. When the isolation valve needs to be repaired, the Velcro can be directly torn off to remove the winding strip. The electric heating jacket 100 of the integrated main body structure is synchronously disassembled with the liquid level meter 200, which is convenient to maintain and does not affect the reliability of the component connection.

[0067] As an optional embodiment, in some embodiments, referring to Figure 1 and Figure 2 One end of the upper liquid level isolation valve 300 is connected to the first connecting part 110 through the first upper flange 310, and the other end is connected to the first connecting pipe 510 of the process equipment 500 through the second upper flange 320. One end of the lower liquid level isolation valve 400 is connected to the second connecting part 120 through the first lower flange 410, and the other end is connected to the second connecting pipe 520 of the process equipment 500 through the second lower flange 420.

[0068] In this embodiment, the upper liquid level isolation valve 300 and the lower liquid level isolation valve 400 are both selected from industrial-grade stop valves or gate valves, with a nominal diameter of DN25-DN50, consistent with the flange specifications of the liquid level meter 200, a design pressure of 1.6-4.0 MPa, a valve body material of 304 stainless steel or Q235 carbon steel, and a valve body length of 120-180 mm, to ensure the installation adaptability with the flange and the electric heating winding strip 800.

[0069] The first upper flange 310 and the first lower flange 410 are both plate type flat welding flanges, the nominal pressure is matched with the isolation valve, the sealing surface type is a protruding surface, the flange outer diameter is 110mm~165mm, the thickness is 10mm~14mm, the number of bolt holes is 4~6, the material is the same as the valve body of the isolation valve, and the flange inner hole is accurately matched with the inlet and outlet diameter of the isolation valve.

[0070] The structure parameters of the second upper flange 320 and the second lower flange 420 are consistent with the first upper flange 310, only the flange bolt hole position needs to be matched with the process equipment connecting pipe flange, and the hole position alignment error is ensured to be ≤1mm during installation.

[0071] The first connecting pipe 510 and the second connecting pipe 520 are extension connecting pipes of the process equipment 500, which are seamless steel pipes, the nominal diameter is consistent with the isolation valve, the length is 200mm~500mm, the wall thickness is 3mm~5mm, the material is the same as the process equipment pipeline, the pipe end is processed flat by a lathe, and the perpendicularity error is ≤0.2mm / m.

[0072] The connecting end of the process equipment 500 is reserved with a flange interface matched with the second upper flange 320 and the second lower flange 420, the interface center distance is consistent with the upper and lower flange center distance of the liquid level meter 200, and the installation of the liquid level meter 200 after installation is ensured to meet the principle of a communicating vessel.

[0073] For example, the inlet end of the upper liquid level isolation valve 300 is connected with the first upper flange 310 by welding, the welding method is argon arc welding or manual electric arc welding, and the penetration detection is carried out after welding to ensure that there is no defect such as air hole and crack. The first upper flange 310 is fastened with the first connecting part 110 of the electric heating jacket 100 through bolts, a sealing gasket is placed between the flanges, the bolts are symmetrically and uniformly fastened, and the sealing surface is ensured to be tightly attached.

[0074] The outlet end of the upper liquid level isolation valve 300 is connected with the second upper flange 320 by welding, the second upper flange 320 is fastened with the first connecting pipe 510 end flange of the process equipment 500 through bolts, the parallelism of the flanges needs to be adjusted during connection to avoid installation stress leading to sealing failure, and anti-rust grease is applied at the threads after the bolts are fastened.

[0075] The inlet end of the lower liquid level isolation valve 400 is connected with the first lower flange 410 by welding, the welding and detection requirements are consistent with those of the upper liquid level isolation valve 300, the first lower flange 410 is fastened with the second connecting part 120 of the electric heating jacket 100 through bolts, the sealing gasket selection and fastening torque are the same as those of the upper part connection, and the upper and lower connection structures are ensured to be symmetrical.

[0076] The outlet end of the lower liquid level isolation valve 400 is welded to the second lower flange 420, and the second lower flange 420 is bolted to the end flange of the second connecting pipe 520 of the process equipment 500. When installed, the center axes of the upper and lower liquid level isolation valves and the center axis of the liquid level meter body should be parallel, with an axis deviation of ≤1mm, to ensure smooth flow of the medium in the connecting pipe.

[0077] The first upper flange 310, the upper liquid level isolation valve 300, the second upper flange 320, and the exposed section of the first connecting pipe 510 require a space for installing the electric heat tracing band, and the distance between the flange edge and the adjacent equipment should be ≥50mm to ensure that the band can be completely wrapped. The bolt head of the connected flange should be lower than the edge of the flange sealing surface to avoid blocking the fitting of the electric heat tracing band and ensure uniform heat transfer to the valve body and the pipe surface.

[0078] As an optional embodiment, in some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , the electric heat tracing band 800 includes a strip-shaped cloth tape 810 and a hook-and-loop tape 820. The second electric heat tracing band 700 is embedded inside the strip-shaped cloth tape 810 and extends along the axial direction of the strip-shaped cloth tape 810. The hook-and-loop tape 820 is arranged at the edge of the strip-shaped cloth tape 810 and is used to wrap the strip-shaped cloth tape 810 around the surfaces of the first upper flange 310, the upper liquid level isolation valve 300, the second upper flange 320, the first lower flange 410, the lower liquid level isolation valve 400, and the second lower flange 420.

[0079] In this embodiment, the strip-shaped cloth tape 810 serves as a carrier substrate and is made of flexible high-thermal-conductivity carbon fiber cloth. The carbon fiber cloth is a thermal composite material woven with high-thermal-conductivity carbon fiber filaments as core materials and has the characteristics of light weight and high strength. Graphite fibers are inert and can effectively resist corrosion from strong acids, strong bases, oxides, salt water, and air humidity. Even in a very high-temperature chemical environment, they can maintain high stability and high tensile strength, and are easy to process.

[0080] The high-thermal-conductivity carbon fiber cloth, as the substrate of the strip-shaped cloth tape, efficiently transfers the heat generated by the electric heat tracing band to the surfaces of the liquid level meter isolation valve and the connecting pipe through its intrinsic heat conduction characteristics. The high thermal conductivity of this material ensures that the thermal resistance between the electric heat tracing band and the surface of the pipe and valve is minimized, and its corrosion resistance adapts to the chemical medium in the industrial environment.

[0081] The strip cloth tape 810 is made into a strip cloth tape with a width of 30-50 mm and a length of 1000-2000 mm, a middle axis position is reserved, the second electric heating tape 700 is inserted and fixed, the tail end of the second electric heating tape 700 is flush with the terminal end of the strip cloth tape 810, and the strip cloth tape 810 is filled with flexible thermal insulation material, so that the strip cloth tape 810 is uniformly heated, and the strip cloth tape 810 is pressed flat to be easy to wind.

[0082] In the embodiment, the hook-and-loop fastener 820 is made of nylon material and is divided into a hook surface and a loop surface and is symmetrically arranged at the two side edges of the strip cloth tape 810, has a width of 10 mm, and has an adhesive strength of ≥5 N / cm, so that the strip cloth tape is not loose after winding and can be repeatedly disassembled and used.

[0083] In the embodiment, the second electric heating tape 700 is a self-limiting electric heating tape and is embedded in the center of the strip cloth tape 810 along the axial direction of the strip cloth tape 810, has a distance of ≥10 mm from the edge of the strip cloth tape, and is fixed to the strip cloth tape by high-temperature glue to avoid displacement.

[0084] For example, the electric heating winding strip 800 is fixed to the isolation valve and the flange by the adhesion of the hook-and-loop fastener 820, and the specific connection mode is as follows:

[0085] Starting from the side of the first upper flange 310 close to the electric heating jacket 100, the strip cloth tape 810 is tightly wound along the outer circle of the flange, the valve body of the upper liquid level isolation valve 300, and the outer circle of the second upper flange 320 in sequence, the winding overlap width is ≥20 mm, and the hook-and-loop fastener 820 is pressed after each winding to ensure firm adhesion, and finally the first upper flange 310, the valve body of the upper liquid level isolation valve 300, and the second upper flange 320 are covered.

[0086] Another electric heating winding strip 800 is covered on the surfaces of the first lower flange 410, the lower liquid level isolation valve 400, and the second lower flange 420 by using the same winding method as the upper side, so that the operation handle of the isolation valve and the flange bolts are not blocked after winding.

[0087] The starting end and the terminal end of the winding strip are fixed by folding and adhering the hook-and-loop fastener itself to form a closed loop, so that the winding strip is not loose due to vibration.

[0088] The lead wire of the second electric heating tape 700 extends along the edge of the strip cloth tape 810 and is connected to the power supply junction box 900 through a waterproof quick connector, so that the connection is sealed well and there is no risk of water entering.

[0089] In order to ensure the heating effect and the connection reliability, the following conditions are met during installation: the strip cloth tape 810 has no gap with the surface of the flange and the valve body, the adhesion degree is ≥95%, the hook-and-loop fastener 820 avoids the sealing surface of the flange and the sealing part of the valve, the isolation valve is not affected after winding, and the handle operation torque is not obviously increased.

[0090] The exposed sections of the first upper flange 310, the upper liquid level isolation valve 300, the second upper flange 320, and the first connecting pipe 510 need to reserve the installation space of the electric heat tracing winding strip. The distance between the edge of the flange and the adjacent equipment is greater than or equal to 50 mm, so that the winding strip can be completely wrapped. The head of the connecting flange bolt needs to be lower than the edge of the flange sealing surface to avoid blocking the fitting of the electric heat tracing winding strip 800, and to ensure that the heat tracing heat is uniformly transmitted to the valve body and the pipe surface.

[0091] As an optional embodiment, in some embodiments, referring to Figure 3 , Figure 4 and Figure 5 , the hook-and-loop fastener 820 includes a first adhesive part 821 arranged on one side of the strip-shaped cloth belt 810, and a second adhesive part 822 arranged on the other side. The first adhesive part 821 and the second adhesive part 822 can be adhered to each other. The first adhesive part 821 is a hook surface, and the second adhesive part 822 is a loop surface.

[0092] In this embodiment, the hook-and-loop fastener 820 is used as the core fixing component of the electric heat tracing winding strip 800, which is made of high-strength nylon 66 material and has a bilateral symmetrical distribution structure, and is specially adapted to the winding and fixing requirements of the strip-shaped cloth belt 810.

[0093] The hook-and-loop fastener 820 is composed of the first adhesive part 821 and the second adhesive part 822, which are integrated on the two opposite side edges of the strip-shaped cloth belt 810, 5 mm to 8 mm away from the side edge of the cloth belt, and each has a unilateral width of 10 mm. The strip-shaped cloth belt 810 is fixed by using a hot melt adhesive composite process, and the peel strength is greater than or equal to 3 N / cm, so that it will not fall off during long-term use.

[0094] The first adhesive part 821 is designed as a hook surface structure, and the surface uniformly distributes high-density nylon hooks. The hook density is greater than or equal to 120 per square centimeter, the hook length is 0.5 mm to 0.8 mm, and the hardness is Shore D 60 to 70. The second adhesive part 822 is designed as a loop surface structure, and the surface is a three-dimensional fluffy nylon fiber layer. When the hook surface and the loop surface are in contact, the hooks can quickly embed the fiber layer to form mechanical engagement, realize tight adhesion, and the adhesion strength is greater than or equal to 5 N / cm. It can be repeatedly opened and closed, and the service life is greater than or equal to 50 times.

[0095] The hook surface hooks are wear-resistant, and the loop surface fibers have anti-aging properties. The whole can adapt to a working temperature range of -40°C to 150°C, resist oil stains, and resist weak corrosion, meet the use requirements of complex industrial site environments, and do not affect the heat transfer of the second electric heat tracing belt 700.

[0096] Exemplary, from the side of the first upper flange 310 close to the electric heat tracing jacket, the strip-shaped cloth tape 810 is tightly wound along the outer circle of the flange, the valve body of the upper liquid level isolation valve 300, and the outer circle of the second upper flange 320 in sequence. When winding, the first adhesive part 821 on one side of the strip-shaped cloth tape 810 is accurately positioned and attached to the second adhesive part 822 of the adjacent winding layer, and the overlapping width of each coil is controlled to be 20mm-30mm. After attachment, press along the winding direction with hand for 3-5 seconds to ensure that the hook surface and the rough surface are fully engaged. After covering the side of the second upper flange 320 away from the valve body, the first adhesive part 821 at the end of the winding strip is folded by 15mm and adhered and fixed with the second adhesive part 822 of the previous layer, finally realizing full-surface gapless coverage of the first upper flange 310, the upper liquid level isolation valve 300, and the second upper flange 320.

[0097] Exemplary, a layer of heat-conducting silica gel coating is applied to the surface of the hook-and-loop tape 820 to form a heat-conducting enhanced hook-and-loop tape, improving the heat conduction performance of the hook-and-loop tape when fixing the electric heat tracing winding strip.

[0098] The hook surface and the rough surface of the hook-and-loop tape 820 are respectively coated with a heat-conducting silica gel layer, and the heat-conducting silica gel layer enhances the heat conduction ability through nano filler. When fixing the electric heat tracing winding strip 800, the heat-conducting silica gel layer directly contacts the surface of the isolation valve and the connecting pipe, forming a heat conduction path and making up for the heat resistance defects that may exist in the hook-and-loop tape 820 itself.

[0099] The heat-conducting silica gel coating significantly reduces the thermal resistance between the hook-and-loop tape 820 and the pipe valve, improves the heat energy transfer efficiency of the electric heat tracing winding strip 800, and ensures the temperature uniformity of the heat tracing area in a low temperature environment. The flexibility of the heat-conducting silica gel combined with the fixing function of the hook-and-loop tape 820 maintains the convenience of disassembly of the hook-and-loop tape 820, and on the other hand, enhances the reliability of heat conduction, avoiding the problem of local insufficient heat tracing caused by heat resistance of traditional hook-and-loop tapes.

[0100] As an optional implementation, in some embodiments, the cross section of the strip-shaped cloth tape 810 along the axial direction is in a wave shape, and the second electric heat tracing tape 700 is embedded in the groove of the wave-shaped cross section. The second electric heat tracing tape 700 is laid along the middle axis of the strip-shaped cloth tape 810, and the tail end of the second electric heat tracing tape 700 is flush with the tail end of the strip-shaped cloth tape 810.

[0101] In this embodiment, the wave-shaped cloth tape is made of high-thermal-conductivity carbon fiber cloth through a hot-pressing forming process, and the second electric heat tracing tape 700 is embedded in the groove of the wave-shaped cross section and uniformly distributed along the wave-shaped axial direction. The wave-shaped structure can adapt to pipe valves of different diameters through its own deformation during winding, and the groove design makes the electric heat tracing tape closely contact the surface of the pipe valve, reducing the heat conduction gap.

[0102] The wave-shaped structure significantly improves the heat conduction efficiency of the electric heat tracing band and the pipe valve by increasing the contact area and the groove fitting design, reduces heat loss, and ensures the stability of the heat tracing effect in low temperature environment. The flexibility and deformability of the wave-shaped band adapt to pipe valves of different sizes, reduce installation difficulty, and avoid the problem of local overheating or insufficient heat tracing caused by uneven tension in traditional winding methods.

[0103] As an optional implementation, in some embodiments, referring to Figure 1 and Figure 2 , the first electric heat tracing band 600 is arranged along the axial direction of the liquid level meter 200, and the side portion of the first electric heat tracing band 600 is provided with an extension section extending outward from the electric heat tracing jacket 100 at positions corresponding to the first connecting portion 110 and the second connecting portion 120.

[0104] In this embodiment, the first electric heat tracing band 600 is laid along the axial center axis of the liquid level meter 200 in parallel, and is fixed to the inside of the jacket through high-temperature-resistant silicone rubber strips, with a fixed point spacing of 300mm-400mm, ensuring that the electric heat tracing band is closely fitted to the surface of the body of the liquid level meter 200 without any suspended heat leakage area.

[0105] The side portion of the first electric heat tracing band 600 is provided with an extension section extending outward from the jacket at positions corresponding to the first connecting portion 110 and the second connecting portion 120 of the electric heat tracing jacket 100, respectively, and the extension section has a length of 150mm-200mm and an outer diameter consistent with that of the main electric heat tracing band, and is wrapped with an outer layer of fluoroplastic insulation layer resistant to temperature of 125℃ to avoid short circuit caused by contact with metal flanges.

[0106] The extension section is led out through the Φ8mm-Φ10mm threading hole reserved by the first connecting portion 110 and the second connecting portion 120, and a rubber sealing ring is additionally installed in the threading hole to fix the position of the extension section and prevent dust and water vapor from entering the inside of the jacket, and the temperature resistance performance of the sealing ring is matched with that of the insulation layer of the electric heat tracing band.

[0107] As an optional implementation, in some embodiments, referring to Figure 1 and Figure 2 , the power supply junction box 900 is an explosion-proof power supply junction box, and a plurality of electric heat tracing band wiring ports 910 are reserved on the power supply junction box 900.

[0108] In this embodiment, the power supply junction box 900 serves as the core control and wiring hub of the electric heat tracing system, and adopts an explosion-proof structure design specially adapted to complex industrial site environments.

[0109] The power junction box 900 is explosion-proof, the shell is made of cast aluminum alloy material, and the surface is treated by electrostatic spraying. The junction box is provided with multiple electric heat tracing port, the number and function of the port are clear: 2-way liquid level meter body heat tracing port, 2-way isolation valve heat tracing port, and 1-2 extra expansion ports. Each port is equipped with an explosion-proof gland, which is suitable for Φ3mm-Φ8mm electric heat tracing lead-out wire. The gland has a built-in sealing rubber ring, which can achieve explosion-proof sealing after tightening and prevent flammable and explosive gases from entering the box body.

[0110] The power junction box 900 is electrically connected with the electric heat tracing of the electric heat tracing winding strip 800 through the reserved multiple electric heat tracing port 910. This design allows the number of electric heat tracing winding strips to be expanded according to the site requirements, realizes unified power supply of multiple loop circuits, and avoids the need for independent layout of electric heat tracing loop. Through the multi-port design of the power junction box 900, the problem of independent layout of multiple electric heat tracing loop in traditional construction is solved, the amount of construction interface and cable is reduced, and the installation efficiency and system integration are improved.

[0111] The power junction box 900 is designed as a rotatable modular structure, which adjusts the connection position of the electric heat tracing winding strip 800 by rotating the junction box body to adapt to the heat tracing requirements of connection pipes of different lengths and angles.

[0112] The power junction box body and the fixed support are connected by a rotating bearing, and the junction box can rotate 90°-180° around the shaft to adjust the wiring direction of the electric heat tracing winding strip 800.

[0113] The junction box is provided with a slidable connection port, which synchronously adjusts the position of the electric heat tracing port through a rotating action, ensuring that the electric heat tracing winding strip 800 can be quickly connected to the power supply under different installation angles.

[0114] The rotating modular design makes the power junction box 900 adapt to the wiring requirements of the electric heat tracing winding strip 800 in different installation scenarios, reduces the on-site adjustment time, and improves the construction efficiency. The matching of the rotatable connection port and the electric heat tracing winding strip is enhanced, which avoids the difficulty of connection or excessive bending of the electric heat tracing due to the deviation of the installation angle, and prolongs the service life of the device.

[0115] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses or adaptive changes of the application following, in general, the principles of the application and including such

[0116] It is to be understood that the application is not limited to the precise construction already described above and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application should only be limited by the claims appended hereto.

Claims

1. A side mounted liquid level gauge electrical tracing apparatus, characterized by, The utility model relates to a kind of electric heat tracing jacket (100), it is wrapped in the body outside of liquid level meter (200), the electric heat tracing jacket (100) is equipped with radially extending first connecting part (110) and second connecting part (120) respectively at axial both ends;The first connecting part (110) and the second connecting part (120) are respectively used to be connected to process equipment (500) by upper liquid level isolation valve (300) and lower liquid level isolation valve (400);First electric heat tracing belt (600) is arranged in the electric heat tracing jacket (100), for the heat tracing of the liquid level meter (200);Second electric heat tracing belt (700) is wound on the surface of the upper liquid level isolation valve (300) and the lower liquid level isolation valve (400) by electric heat tracing winding strip (800);Power connection box (900) is arranged on the electric heat tracing jacket (100), and is electrically connected with the first electric heat tracing belt (600) and the second electric heat tracing belt (700). One end of the upper liquid level isolation valve (300) is connected with the first connecting part (110) by first upper flange (310), and the other end is connected with the first connecting pipe (510) of the process equipment (500) by second upper flange (320); One end of the lower liquid level isolation valve (400) is connected with the second connecting part (120) by first lower flange (410), and the other end is connected with the second connecting pipe (520) of the process equipment (500) by second lower flange (420). The electric heat tracing winding strip (800) includes strip-shaped cloth tape (810) and hook-and-loop tape (820), the second electric heat tracing belt (700) is embedded in the strip-shaped cloth tape (810), and the second electric heat tracing belt (700) extends along the axial direction of the strip-shaped cloth tape (810); The hook-and-loop tape (820) is arranged on the edge of the strip-shaped cloth tape (810), and is used for winding the strip-shaped cloth tape (810) on the surface of the first upper flange (310), the upper liquid level isolation valve (300), the second upper flange (320), the first lower flange (410), the lower liquid level isolation valve (400) and the second lower flange (420).

2. A side mounted liquid level meter electrical tracing apparatus according to claim 1, wherein, The hook-and-loop tape (820) includes first adhesive part (821) arranged on one side of the strip-shaped cloth tape (810), and second adhesive part (822) arranged on the other side, and the first adhesive part (821) and the second adhesive part (822) can be adhered to each other. The first adhesive part (821) is a hook surface, and the second adhesive part (822) is a loop surface.

3. A side mounted liquid level meter electrical tracing apparatus according to claim 2, wherein, The cross section of the strip-shaped cloth tape (810) in the axial direction is in a wave shape, and the second electric heat tracing belt (700) is embedded in the groove of the wave-shaped cross section. The second electric heat tracing belt (700) is laid along the middle axis of the strip-shaped cloth tape (810), and the tail end of the second electric heat tracing belt (700) is flush with the tail end of the strip-shaped cloth tape (810).

4. A side mounted liquid level meter electrical tracing apparatus according to claim 3, wherein, The strip-shaped cloth tape (810) is a high-thermal-conductivity carbon fiber cloth strip.

5. A side mounted liquid level meter electrical tracing apparatus according to claim 4, wherein, ​ 6. A side mounted liquid level meter electrical tracing apparatus according to claim 3, wherein, ​ 7. A side mounted liquid level meter electrical tracing apparatus as defined in claim 3, wherein, ​ 8. A side mounted liquid level meter electrical tracing apparatus according to claim 3, wherein, ​ 9. A liquid level meter electrical tracing apparatus according to any one of claims 1 to 8, wherein The first electric heat tracing band (600) is arranged along the axial direction of the liquid level meter (200); The side part of the first electric heat tracing band (600) is provided with an extension section extending to the outside of the electric heat tracing jacket (100) at positions corresponding to the first connecting part (110) and the second connecting part (120).

10. A liquid level meter electrical tracing apparatus according to any one of claims 1 to 8, wherein The power junction box (900) is an explosion-proof power junction box, and a plurality of electric heat tracing band wiring ports (910) are reserved on the power junction box (900).

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