Reaction kettle floating ball liquid level meter anti-impact sheath

Abstract

The application discloses a kind of reaction kettle floating ball liquid level meter anti-impact sheath, belong to reaction kettle liquid level measurement protection equipment technical field.The core structure includes the hollow tubular sheath main body of integrated forming, the main body is made of corrosion-resistant austenitic metal material, side wall is provided with the liquid level balance flow guide through hole of directional distribution, bottom end is provided with coaxial limiting concentric ring, top end is equipped with standardization detachable TC flange plate.Through the directional design of through hole back to water flow, impact flow field can be effectively blocked;Using TC flange quick-mount structure, the convenient adaptation installation of floating ball liquid level meter can be realized.The application effectively solves the measurement distortion caused by impact in the strong stirring flow field of traditional floating ball liquid level meter in reaction kettle, and the measurement failure caused by the easy falling of floating ball bottom limiting block, etc.Technical pain points, adaptation floating ball specification φ40±X (X≤20) Floating ball liquid level meter, can be widely used in chemical industry, pharmaceutical, fine chemical industry and other strong disturbance reaction kettle liquid level measurement scene.

Description

Technical Field

[0001] This invention relates to the technical field of reaction vessel liquid level measurement and protection equipment, specifically to an anti-impact protective sleeve for a reaction vessel float level gauge. Background Technology

[0002] In industrial production processes, reaction vessels are key reaction equipment in industries such as chemical, pharmaceutical, and fine chemical manufacturing. The stability and accuracy of their internal liquid level parameters directly affect the safety, efficiency, and quality of the reaction process. Therefore, reliable and real-time measurement of the liquid level in reaction vessels is a crucial aspect of industrial automation control.

[0003] Float level gauges are widely used in various reaction vessels and containers for level measurement due to their simple structure, intuitive working principle, fast response speed, and low manufacturing and maintenance costs. They remain particularly advantageous in applications with complex operating conditions and high reliability requirements for measuring equipment.

[0004] However, in practical industrial applications, the use of small-sized float level gauges with a float size of φ40±X (X≤20) in reaction vessel environments still presents significant technical challenges. Specifically: First, due to factors such as the high-speed rotation of the agitator, the periodic inflow and outflow of materials, and the flow of the reaction medium itself, a strong turbulent flow field is easily formed inside the reactor during operation. Under these conditions, small-sized floats, due to their light weight and low inertia, are easily affected by liquid impacts, causing them to deviate or swing violently. This results in the floats failing to accurately reflect the true liquid level position, leading to significant fluctuations or even distortions in the liquid level measurement results, making it difficult to meet the process control requirements for measurement accuracy and stability.

[0005] Secondly, existing float level gauges typically limit the float's movement by using an independent limiting block at the bottom of the measuring rod. This limiting block is often detachable, and under the strong disturbances in the flow field of the reactor and the repeated impacts from the float over a long period, it is prone to loosening or even falling off. Once the limiting block detaches, the float loses its effective restraint and may fall into the reactor with the medium, causing the level gauge to malfunction. In severe cases, this could even adversely affect the production process within the reactor.

[0006] Furthermore, existing protective structures for float level gauges operating in reactor conditions are mostly concentrated on large-scale level gauges or specific equipment types, lacking versatility in their structural design. For small-scale float level gauges with a total length not exceeding 1000 mm, existing protective sleeves have significant shortcomings in terms of size adaptability, installation methods, and ease of maintenance. Some protective structures require modifications to the reactor or level gauge body during installation, which not only increases the difficulty of installation and maintenance but also reduces the flexibility of equipment operation.

[0007] To address the aforementioned issues, while existing technologies have proposed some improved solutions by setting baffles, adding protective covers, or adjusting the installation structure, these solutions typically only address a single problem locally and fail to simultaneously consider the float's impact resistance stability under strong turbulent flow fields, the long-term reliability of the limiting structure, and the installation adaptability in reactor application scenarios. They still suffer from limitations such as limited protective effect, insufficient structural reliability, and limited applicability.

[0008] Patent document CN209280096U discloses a method to reduce the impact of fluid fluctuations on the liquid level measuring element by setting a flow stabilizing component outside the liquid level detection area and incorporating a permeable hole structure on the flow stabilizing component, thereby improving the stability of liquid level measurement to a certain extent. This technical solution is mainly applicable to specific liquid level detection equipment or container environments, and the focus of its flow stabilizing structure is to reduce the amplitude of liquid level fluctuations. However, this solution does not specifically address the strong disturbance flow field inside the reactor caused by stirring and feeding, nor does it address the directional anti-impact structure and float limiting reliability issues of the float level gauge under strong impact conditions. Therefore, it is difficult to meet the practical application requirements of small-sized float level gauges in reactors. Furthermore, patent document CN206876266U discloses a structure such as a ball bearing bracket inside the wave-damping cylinder, which reduces the frictional resistance between the float and the cylinder wall when the float undergoes lateral displacement through the rolling action of the balls, thereby reducing jamming and improving the smoothness of the float's movement. Patent document CN218167369U discloses a wave-damping barrel suitable for level measurement in flotation equipment. While these two existing technologies can achieve certain wave-damping or structural optimization effects in their respective application scenarios, they do not offer targeted combined solutions to problems such as the small-sized float being easily impacted by water flow under strong disturbance flow fields like strong stirring in reactors, leading to measurement distortion, and the traditional limiting block easily falling off, causing measurement failure. Therefore, their applicability in reactor level measurement scenarios remains limited.

[0009] For example, patent document CN209541855U achieves external protection for the float level gauge by setting up a casing, detection tube, limiting plug, and cover plate, while also considering the convenience of installation, disassembly, and operational observation. This type of technical solution focuses on the protection and sealing of the level gauge body, belonging to the external structural protection improvement type. Furthermore, Chinese patent CN218916479U mainly optimizes the structural form and installation method of the float level gauge body to improve the ease of use or structural stability of the level gauge. While the above two types of technical solutions improve the structural protection or installation reliability of the level gauge to some extent, their improvements are concentrated on the level gauge body or external structure level, without specifically designing for the strong disturbance flow field formed by stirring, feeding, and other factors inside the reactor. Therefore, their applicability in reactor level measurement scenarios still has certain limitations.

[0010] Therefore, there is an urgent need to provide a solution for an anti-shock sleeve for float level gauges that has a reasonable structural design, high functional integration, and can adapt to the strong disturbance conditions of reactors, so as to effectively improve the stability, reliability and applicability of small-sized float level gauges in reactor level measurement. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an anti-impact protective sleeve for a float level gauge in a reactor. By setting a hollow tubular sleeve body with a directional liquid level balance guiding hole on the outside of the float of the float level gauge, and setting a coaxial limiting concentric ring at the bottom end of the sleeve and a TC flange at the top end, the direct impact of liquid on the float is blocked under the strong disturbance flow field of the reactor, the limiting stability and concentricity of the float are improved, and the installation adaptation and disassembly and maintenance efficiency are improved, so as to effectively solve the problems of easy measurement distortion, easy detachment of the limiting block and insufficient adaptability of small-sized float level gauges.

[0012] To achieve the above objectives, the present invention provides the following technical solution: an anti-impact sleeve for a float level gauge in a reactor, comprising a sleeve body, a level balancing guide hole, and a coaxial limiting concentric ring. The sleeve body is a hollow tubular structure made of corrosion-resistant austenitic metal, suitable for being fitted onto the outside of the float of the float level gauge. The level balancing guide hole is opened on the side wall of the sleeve body, evenly distributed along the axial direction of the sleeve body. The opening direction of the level balancing guide hole is opposite to the water flow direction in the reactor, and the opening area of ​​the level balancing guide hole covers the core measuring liquid level range of the float. The coaxial limiting concentric ring is disposed at the bottom end of the sleeve body and is attached to the sleeve body. The main body is coaxially arranged to replace the bottom limiting block of the float level gauge, thereby limiting the movement of the float and preventing it from falling off. The top of the sheath body is provided with a TC flange, which is fixedly connected to the sheath body. The TC flange is used for detachable connection with the level gauge and / or the reactor's connecting flange, enabling quick assembly of the sheath body between the reactor and the float level gauge. The directional arrangement of the level balance guide hole blocks the impact flow field in the reactor, and the coaxial limiting concentric ring improves the limiting stability and concentricity of the float level gauge, thereby reducing the impact on the accuracy of float level measurement under strong disturbance conditions.

[0013] Furthermore, the outer diameter of the sheath body 1 is φ40±X mm (X≤30), the inner diameter is φ40±X mm (X≤27), and the total length is 100~1000 mm.

[0014] Furthermore, the liquid level balancing guide hole is a circular or elliptical through hole. When the liquid level balancing guide hole is a circular through hole, its diameter is 8 to 28 mm; when the liquid level balancing guide hole is an elliptical through hole, its major axis length is 8 to 400 mm and its minor axis length is 2 to 18 mm.

[0015] Furthermore, the number of liquid level balancing guide holes is 2 to 80, the center-to-center distance between adjacent liquid level balancing guide holes is 2 to 18 mm, and the opening rate of the through holes is 2% to 30%. To ensure that adjacent through holes retain a minimum edge distance e, the through holes should be avoided from overlapping or connecting. The larger the hole, the greater the center distance.

[0016] Furthermore, the coaxial limiting concentric ring is made of corrosion-resistant material and is integrally formed or assembled with the sheath body through laser cutting. When assembled, the thickness of the coaxial limiting concentric ring is 4-28 mm, and its outer diameter is 0.05-0.2 mm larger than the inner diameter of the sheath body. It adopts interference fit, and the concentricity is ≤0.1 mm. It replaces the traditional independent limiting block, which eliminates the risk of limiting block falling off from the structure. The assembly structure can enhance the overall rigidity of the sheath and ensure the coaxiality of the sheath and the level gauge measuring rod, avoiding installation misalignment.

[0017] Furthermore, the coaxial limiting concentric ring is provided with 4 to 8 evenly distributed through holes, and a central through hole is provided that is coaxial with the outer circle of the coaxial limiting concentric ring, which is used to fit the guide rod of the float level gauge and forcefully ensure concentricity.

[0018] Furthermore, the sheath body is made of 316L stainless steel or titanium alloy, and its surface roughness Ra≤3.2 after surface treatment.

[0019] Furthermore, the inner wall of the sheath body is coated with a corrosion-resistant and wear-resistant coating, the thickness of which is 0.1 to 0.5 mm and the coefficient of friction is ≤0.1; or, the roughness Ra of the inner wall of the sheath body is <3.2 after fine treatment; the inner diameter of the sheath body is larger than the outer diameter of the float and a gap δ is reserved.

[0020] Furthermore, the TC flange is made of stainless steel, titanium, or plastic and is fixed to the sheath body by welding or threaded connection.

[0021] Furthermore, a sealing gasket is provided at the connection between the TC flange and the sheath body. The thickness of the sealing gasket is 1 to 6 mm, which is used to prevent leakage of the medium inside the reactor.

[0022] Impact-resistant measurement method / working process: The float of the float level gauge is placed inside a hollow tubular impact-resistant sheath body, and the level balance guide hole on the side wall of the sheath body, corresponding to the core liquid level measurement range of the float, faces away from the main flow direction of the liquid in the reactor. The liquid level balance guide hole keeps the liquid level inside and outside the sheath in real time in balance, and the sheath body shields the float from the impact of the fluid. At the same time, the coaxial limiting concentric ring at the bottom of the sheath body limits the minimum stroke of the float and concentrically guides the guide rod of the level gauge. When the liquid level in the reactor changes, the float moves up and down with the liquid level inside the sheath body, thus achieving stable and reliable liquid level measurement under strong disturbance conditions.

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention is specifically designed for small-mass floats with a specification of φ40±X (X≤20). A liquid level balancing guide hole is set on the side wall of the sheath body, and its opening direction is opposite to the main flow direction of the liquid in the reactor. At the same time, the opening area of ​​the through hole covers the core liquid level measurement range of the float. Under the strong disturbance flow field conditions caused by reactor stirring, feeding / discharging, etc., the sheath body can effectively shield the impact flow, and the through hole can ensure rapid balance of liquid levels inside and outside the sheath. This reduces the direct impact and abnormal sway of the float, significantly improves the stability and accuracy of liquid level measurement, and reduces the risk of measurement fluctuation and distortion.

[0024] 2. A coaxial limiting concentric ring is set at the bottom of the sheath to limit the movement of the float and replace the traditional independent bottom limiting block. Compared with the problem of loosening and falling off of the detachable limiting block under strong disturbance conditions, this structure can effectively avoid measurement failure caused by the falling off of the limiting component and improve the long-term reliability of the float level gauge. At the same time, the concentric ring is set coaxially with the sheath, which helps to maintain the concentric guidance of the float and the guide rod and reduce the probability of deflection and jamming.

[0025] 3. The main body of the sheath is made of metal and forms a stable structural system with the coaxial limiting concentric ring. This can enhance the structural rigidity and vibration resistance of the level gauge guide rod and the overall sheath to a certain extent, reduce the impact of structural deformation and shaking on measurement stability under strong disturbance environment, and thus further improve the adaptability of the device in reactor conditions. The main body of the sheath is equipped with a TC flange, which can realize the quick assembly and disassembly between the sheath and the reactor and the float level gauge, reduce the need for on-site modification, improve installation efficiency and maintenance convenience, and has stronger adaptability. It is especially suitable for the engineering application of small-sized float level gauges in reactor scenarios.

[0026] 4. By applying a corrosion-resistant and wear-resistant coating or performing fine treatment on the inner wall of the sheath, the friction and wear during the rise and fall of the float can be reduced, improving operational smoothness and extending service life. At the same time, the installation of sealing gaskets at the flange connection helps to improve installation sealing, reduce the risk of media leakage, and make the device more adaptable to long-term stable operation in the complex media environment of the reactor. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the main structure of the impact-resistant sheath of the present invention; Figure 2 This is a detailed schematic diagram of the TC flange at the top of the sheath of the present invention; Figure 3 This is a schematic diagram showing the usage state of the sheath of the present invention installed between the reaction vessel and the level gauge.

[0028] In the diagram: 1. Sheath body, 2. Liquid level balance guide hole, 3. Coaxial limiting concentric ring, 4. TC flange, 5. Sealing gasket, 6. Float, 7. Reactor, 8. Liquid level gauge. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] Please see Figure 1-3 The present invention provides a technical solution: an anti-impact sleeve for a float level gauge in a reactor, comprising a sleeve body 1, a level balance guide hole 2, a coaxial limiting concentric ring 3, a TC flange 4, and a sealing gasket 5; the anti-impact sleeve is used to be installed between the reactor 7 and the float level gauge 8, so that the float 6 is located inside the sleeve body 1, thereby providing anti-impact, limiting and guiding, convenient installation, and sealing and leak prevention functions for the float 6 under the strong disturbance flow field of the reactor.

[0031] The sheath body 1 is a hollow tubular structure, which can be manufactured in one piece to ensure overall strength and structural stability. The sheath body 1 is made of corrosion-resistant austenitic metal, preferably 316L stainless steel or titanium alloy, and its surface can be treated to ensure that the roughness meets Ra≤3.2. The size of the sheath body 1 can be matched and set according to the installation space of the reactor and the liquid level measurement range. For example, the outer diameter is φ40±X mm (X≤30), the inner diameter is φ40±X mm (X≤27), and the total length is 100~1000 mm to accommodate small-sized floats (e.g., φ40±X, X≤20) float level gauges 8, so that the float 6 can rise and fall stably within the sheath body 1.

[0032] The liquid level balancing guide holes 2 are opened on the side wall of the sheath body 1 and are evenly distributed along the axial direction of the sheath body 1. The opening area of ​​the through holes 2 covers the core liquid level measurement range of the float 6, so that the liquid levels inside and outside the sheath can be quickly exchanged and kept in real time balance, avoiding the float 6 from floating normally due to the pressure difference inside and outside the sheath. The core liquid level measurement range refers to the upper and lower travel range of the float within the normal measurement range, such as the travel between the upper and lower limits of the range. The opening area of ​​the through holes covers at least 80% or all of this range. In order to reduce the direct effect of the impact flow in the reactor 7 on the float 6, the present invention sets the opening direction of the liquid level balancing guide holes 2 to be opposite to the water flow direction of the liquid in the reactor 7 (i.e., opposite to the main flow direction), so that the impact flow first acts on the pipe wall of the sheath body 1 and is blocked and weakened, thereby reducing the probability of the impact flow directly entering the inner cavity of the sheath through the through holes 2 and impacting the float 6. The through holes 2 can be circular or elliptical: the diameter of the circular through hole is 8 to 28 mm; the major axis length of the elliptical through hole is 8 to 400 mm. mm, short axis length is 2 to 18 mm; the number of through holes 2 can be 2 to 80, the center distance between adjacent through holes is 2 to 18 mm, and the total open area of ​​through holes is 2% to 30%; through holes 2 can be formed by drilling, punching or laser cutting, and the hole opening can be deburred to reduce the potential impact on the movement of float 6. The outer wall of the sheath body 1 can be provided with directional markings (such as arrows / grids) to indicate the direction of the through hole, that is, the opening area on the back flow side of the sheath body 1; during installation, the markings should be positioned away from the main flow side of the agitator or the flow side of the feed inlet, and the opposite direction of the water flow indicates the main flow direction, which is the flow direction that has the main impact on the float under the agitation / feeding / discharging conditions.

[0033] A coaxial limiting concentric ring 3 is disposed at the bottom end of the sheath body 1 and is coaxially arranged with the sheath body 1. It is used to limit the movement stroke of the float 6 (especially the minimum stroke) and replaces the independent limiting block at the bottom of the traditional float level gauge 8, reducing the risk of failure caused by loosening or falling off of detachable limiting components under strong disturbances and repeated impacts. Simultaneously, the concentric ring 3 provides concentric guiding constraint for the guide rod of the level gauge 8, which helps reduce the probability of deflection and jamming during the rise and fall of the float 6. Preferably, the coaxial limiting concentric ring 3 is made of corrosion-resistant material and can be integrally formed with the sheath body 1 by laser cutting, or assembled with the sheath body 1 as an independent part. Its thickness can be 4–28 mm, its outer diameter can be set to be 0.05–0.2 mm larger than the inner diameter of the sheath body 1, and its concentricity ≤0.1. mm; furthermore, the concentric ring 3 is provided with 4 to 8 evenly distributed through holes, and a central through hole is provided coaxially with the outer circle of the concentric ring, for coaxial cooperation with the guide rod of the float level gauge 8, with clearance fit / sliding fit, to reduce the risk of jamming and achieve concentric guidance.

[0034] A TC flange 4 is installed at the top of the sheath body 1. TC is a sanitary quick-connect clamp interface, and its specifications can be selected according to the existing sanitary clamp flange standard and matched with both ends. The TC flange 4 is fixedly connected to the sheath body 1 (e.g., by welding or threaded connection). The TC flange 4 is used to detachably connect to the level gauge 8 and / or the connecting flange of the reactor 7 by means of a quick-connect clamp, so as to achieve rapid assembly and disassembly. It is used to quickly assemble the sheath body 1 between the reactor 7 and the float level gauge 8, thereby improving assembly efficiency and maintenance convenience, and reducing on-site modification. The TC flange 4 can be made of stainless steel, titanium or plastic, and can be fixed to the sheath body 1 by welding or threaded connection. A sealing gasket 5 is installed at the connection between the TC flange 4 and the sheath body 1. The sealing gasket 5 has a thickness of 1 to 6 mm, which is used to improve the sealing performance of the connection and reduce the risk of media leakage.

[0035] In one optional embodiment, to further reduce the friction and wear between the float 6 and the inner wall of the sheath body 1 during the lifting and lowering process, the inner wall of the sheath body 1 may be coated with a corrosion-resistant and wear-resistant coating with a coating thickness of 0.1 to 0.5 mm and a friction coefficient ≤ 0.1; or the inner wall may be finely treated to make the roughness Ra < 3.2, so as to improve the smoothness of the movement of the float 6 and extend its service life.

[0036] In a preferred embodiment, the installation process of the impact-resistant sleeve of the present invention can be carried out according to the following steps: First, mount the float 6 (specification φ40±X, X≤20) onto the measuring rod of the level gauge 8, and confirm that the lifting stroke of the float 6 corresponds to the opening area of ​​the level balance guide hole 2; The second step is to put the sheath of the present invention on the outside of the float 6, so that the coaxial limiting concentric ring 3 at the bottom end of the sheath fits or cooperates with the bottom limiting structure of the liquid level gauge 8, and adjust the direction of the sheath to ensure that the liquid level balance guide hole 2 faces away from the water flow direction of the liquid in the reactor 7. The third step is to install a sealing gasket 5 at the connection between the TC flange 4 and the sheath body 1, and then use a clamp to secure the sheath between the level gauge 8 and the reactor 7 connecting flange. Tighten the fasteners to ensure that the sheath is securely installed, without any looseness, and meets the sealing requirements.

[0037] The concentric ring can be integrally formed with the sheath; or it can be assembled and connected to the sheath as an independent part. The assembly connection method can be one of interference fit, threaded connection, etc.

[0038] The working process of this invention is as follows: When the liquid level in the reactor 7 changes, the liquid freely enters and exits the interior of the sheath body 1 through the liquid level balance guide hole 2, so that the liquid level inside and outside the sheath is kept in real time balance, and the float 6 can float up and down normally with the liquid level to complete the measurement; when the water flow in the reactor 7 forms an impact, since the guide hole 2 is set in the opposite direction of the water flow, the water flow is blocked and weakened by the pipe wall of the sheath body 1, and cannot directly impact the small mass float 6 through the through hole 2, thus avoiding the float 6 from deviating from the normal liquid level position, thereby ensuring the measurement is effective and improving stability; the coaxial limiting concentric ring 3 and the sheath body 1 can be assembled by interference fit or thread, etc., which is reliable and has no risk of falling off, and can effectively limit the minimum stroke of the float 6, avoiding the float 6 from falling into the reactor 7 under no liquid level or extreme working conditions, causing the level gauge to fail; the wear-resistant coating or fine treatment structure of the inner wall reduces the friction and wear of the float 6 when it rises and falls, and the sealing gasket 5 prevents the medium from leaking, so that the overall structure has a high long-term stable operation capability under the working conditions of the reactor 7.

[0039] Industrial Applicability: The shock-resistant sleeve for the float level gauge of this invention adopts standardized pipe processing and universal flange connection, which facilitates mass production and can be adapted to mainstream float level gauges and reactor equipment. It has broad industrial application value in chemical, pharmaceutical, and fine chemical industries where high-disturbance reactor level measurement is involved. It can effectively reduce the risk of measurement distortion caused by impact and improve the reliability of the limit structure, thereby improving the stability of level control and process control effect in the production process.

[0040] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. An anti-impact protective sleeve for a float level gauge in a reactor, comprising a sleeve body (1), a level balancing guide hole (2), and a coaxial limiting concentric ring (3), characterized in that: The sheath body (1) is a hollow tubular structure made of corrosion-resistant austenitic metal. The liquid level balance guide hole is opened on the side wall of the sheath body (1) and is distributed at equal intervals along the axial direction of the sheath body (1). The opening direction of the liquid level balance guide hole (2) is opposite to the water flow direction of the liquid in the reactor, and the opening area of ​​the liquid level balance guide hole (2) covers the core measuring liquid level range of the float. The coaxial limiting concentric ring (3) is set at the bottom of the sheath body (1) and is coaxial with the sheath body (1). The top of the sheath body (1) is provided with a TC flange (4). The TC flange (4) is fixedly connected to the sheath body (1), and the TC flange (4) is used to detachably connect to the liquid level gauge and / or the connecting flange of the reactor. The liquid level balance guide hole (2) is oriented to block the impact flow field in the reactor, and the coaxial limiting concentric ring (3) improves the limiting stability and concentricity of the float liquid level gauge.

2. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The outer diameter of the sheath body (1) is φ40±X mm (X≤30), the inner diameter is φ40±X mm (X≤27), and the total length is 100~1000 mm.

3. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1 or 2, characterized in that: The liquid level balancing guide hole (2) is a circular or elliptical through hole. When the liquid level balancing guide hole (2) is a circular through hole, its diameter is 8 to 28 mm. When the liquid level balancing guide hole (2) is an elliptical through hole, its major axis length is 8 to 400 mm and its minor axis length is 2 to 18 mm.

4. The shock-resistant protective sleeve for a reactor float level gauge according to any one of claims 1, characterized in that: The number of liquid level balancing guide holes (2) is 2 to 80, the center distance between adjacent liquid level balancing guide holes (2) is 2 to 18 mm, and the opening rate of the through holes is 2% to 30%.

5. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The coaxial limiting concentric ring (3) is made of corrosion-resistant material and is integrally formed or assembled with the sheath body by laser cutting.

6. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The coaxial limiting concentric ring (3) is provided with 4 to 8 evenly distributed through holes, and a central through hole is provided that is coaxially arranged with the outer circle of the coaxial limiting concentric ring (3).

7. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The sheath body (1) is made of 316L stainless steel or titanium alloy, and its surface roughness Ra≤3.2 after surface treatment. The thickness of the coaxial limiting concentric ring (3) is 4~28 mm, its outer diameter is 0.05~0.2 mm larger than the inner diameter of the sheath body (1), and the concentricity is ≤0.1 mm.

8. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The inner wall of the sheath body (1) is coated with a corrosion-resistant and wear-resistant coating. The thickness of the coating is 0.1 to 0.5 mm and the coefficient of friction is ≤0.

1. Alternatively, the roughness Ra of the inner wall of the sheath body (1) is <3.2 after fine treatment.

9. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: The TC flange (4) is made of stainless steel, titanium or plastic and is fixed to the sheath body (1) by welding or threaded connection.

10. The shock-resistant protective sleeve for a reactor float level gauge according to claim 1, characterized in that: A sealing gasket (5) is provided at the connection between the TC flange (4) and the sheath body (1), and the thickness of the sealing gasket (5) is 1 to 6 mm.

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