Liquid level measuring device for low-temperature storage tank

Abstract

The utility model belongs to the technical field of low-temperature storage tank liquid level measurement, and particularly relates to a low-temperature storage tank liquid level measuring device. Comprising a pipe cover, a pipe seat, a shell and a liquid phase pipeline, the pipe cover is welded to the inner side of the shell, and a hole is formed in the side wall of the pipe cover. The tube base is welded to the bottom of the shell, one end of the tube base is inserted into the tube cover, and the other end of the tube base is located outside the shell. The liquid phase pipeline is inserted into the pipe seat, and a hole is formed in the top of the pipe seat. According to the utility model, low-temperature liquid is prevented from entering the liquid phase pipeline through the pipe cover, so that the reading of the liquid level meter can accurately and quickly reflect the liquid level condition in the low-temperature storage tank. The pipe cover can prevent impurities in the low-temperature storage tank from entering the liquid phase pipeline, and blockage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the low temperature storage tank liquid level measurement technical field, concretely relates to a low temperature storage tank liquid level measuring device. BACKGROUND

[0002] In the field of liquid level measurement of low temperature storage tank, accurate and reliable liquid level monitoring is crucial to safety production and storage and transportation efficiency. However, in the low temperature environment, the liquid phase pipeline of the conventional liquid level meter is prone to condensation or reverse flow of low temperature liquid due to temperature difference, causing internal icing or liquid level signal delay of the pipeline, which seriously affects the measurement accuracy. The low temperature storage tank often contains solid impurities (such as ice crystals or particulate matter), which are easy to enter the measuring pipeline with the liquid, causing blockage or damage to the sensor. The existing device is connected by flange or thread, which is easy to cause leakage due to material shrinkage under extreme low temperature conditions, damaging the sealing performance, and even causing safety hazards.

[0003] The Chinese patent with publication number CN221076146U discloses a liquid level measurement system for low temperature storage tank, which at least includes: a double corrugated pipe differential liquid level meter, a control valve unit, a gas phase control unit and a liquid phase control unit; the double corrugated pipe differential liquid level meter has a gas phase path and a liquid phase path, one end of the gas phase control unit is connected with the top of the storage tank, and the other end is connected with the gas phase path through the control valve unit; one end of the liquid phase control unit is connected with the bottom of the storage tank, and the other end is connected with the liquid phase path through the control valve unit. The liquid level measurement system of the utility model embodiment, by setting a gas-liquid separator in the gas phase control unit, effectively separates the gas-liquid mixture in the gas phase control unit, avoids the liquid entering the gas phase path to cause the pointer of the double corrugated pipe differential liquid level meter to swing, and thus ensures the accuracy of the liquid level measurement result of the double corrugated pipe differential liquid level meter. The above-mentioned device has a complex overall measurement process, increases the use cost of the low temperature storage tank, and causes the system measurement result to deviate greatly under the influence of impurities. Therefore, it is urgent for the technical personnel in the field to solve the above-mentioned technical problems. SUMMARY

[0004] The utility model discloses in order to solve the prior art, the whole measurement process is complex, increased the use cost of low temperature storage tank, under the influence of impurities causes the system measurement result to deviate greatly.

[0005] The utility model discloses the technical scheme that adopts has:

[0006] A low temperature storage tank liquid level measuring device is used for the liquid level measurement of low temperature storage tank, and the low temperature storage tank liquid level measuring device is welded together with the low temperature storage tank as a base of the low temperature storage tank, comprising a pipe cover, a pipe seat, a shell and a liquid phase pipeline.

[0007] The pipe cover is welded on the inner side of the shell, and the side wall of the pipe cover is perforated.

[0008] The pipe seat is welded to the bottom of the shell, one end of the pipe seat is inserted into the pipe cover, and the other end of the pipe seat is located outside the shell; the liquid phase pipeline is inserted into the pipe seat, and the top of the pipe seat is provided with an opening.

[0009] By adopting the above technical scheme, the low-temperature liquid can enter the inside of the pipe cover without directly contacting the liquid phase pipeline, ensuring that the reading of the liquid level meter can accurately and quickly reflect the real liquid level condition inside the low-temperature storage tank. The existence of the pipe cover effectively prevents sundries inside the low-temperature storage tank from entering the liquid phase pipeline, avoiding the problem of blockage caused by sundries, prolonging the service life of the equipment, reducing the need for maintenance and cleaning, and using full welding and full penetration to connect the pipe cover, the pipe seat and the shell, thereby enhancing the structural stability and sealing performance of the entire device. This is particularly important for equipment working in extremely low-temperature environments, as good sealing performance can prevent external factors from affecting the measurement results.

[0010] Further, the pipe cover side wall is provided with four holes as liquid inlet holes of the pipe cover, and the liquid inlet holes are arranged below the top of the pipe seat.

[0011] By adopting the above technical scheme, the four equally distributed liquid inlet holes can ensure that the low-temperature liquid enters the inside of the pipe cover uniformly from different directions, which helps to avoid measurement errors that may be caused by single-point liquid inlet, thereby improving the accuracy of liquid level measurement. Through the design of multiple liquid inlet holes, the direction and speed of liquid flow can be dispersed, reducing the fluid disturbance caused when the liquid enters the pipe cover. This not only reduces the influence of turbulent flow or local high pressure on the reading of the liquid level meter, but also helps to maintain the stability of the liquid surface, making the measurement more accurate. Multiple liquid inlet holes can effectively disperse the energy of the incoming liquid, reducing the possibility of air bubbles generated when the liquid is quickly injected. This is particularly important for low-temperature liquids, as the presence of air bubbles may interfere with the operation of the liquid level sensor, resulting in incorrect measurement results. When one of the liquid inlet holes is blocked or partially blocked, the other liquid inlet holes can still ensure normal liquid inflow, maintaining the normal operation of the liquid level meter. Such a redundant design increases the reliability and stability of the entire system.

[0012] Further, the four liquid inlet holes equally divide the pipe cover, and the angle difference between the liquid inlet holes along the horizontal circumferential direction is 90°.

[0013] By adopting the above technical solution, this layout ensures that the liquid can enter the system uniformly. Each liquid inlet hole is separated by 90 degrees, meaning that the liquid flow can be more evenly distributed around the pipe cover, helping to improve flow efficiency and uniformity. By evenly distributing the liquid inlet holes on the pipe cover, it can help to achieve balanced distribution of fluid pressure, reducing the problem of system instability caused by excessive or insufficient local pressure. Symmetrical design is usually easier to manufacture because it often involves simpler geometry and fewer changes, which can reduce production costs and complexity.

[0014] Further, the pipe cover and the shell are welded together by full penetration welding.

[0015] By adopting the above technical solution, full penetration welding, which means that the entire joint surface is covered with welding material, provides a stronger connection. This design can significantly improve the overall structural strength and stability of the assembly, reducing the risk of loosening or separation caused by vibration or external force. Full penetration welding can effectively prevent liquid or gas leakage, especially suitable for applications that require high sealing performance, such as high-pressure containers, piping systems, etc. Good sealing performance is one of the key factors to ensure the normal operation of the system.

[0016] Further, the pipe seat and the shell are welded together by full penetration welding.

[0017] By adopting the above technical solution, full penetration welding means that the weld completely penetrates the two materials being connected, forming a continuous and strong joint, improving the connection strength and being able to withstand larger mechanical loads. Since the weld penetrates the entire thickness, there are no unfused areas or potential leakage paths, making full penetration welding particularly good at preventing fluid or gas leakage. Full penetration welding reduces stress concentration points and potential crack sources, improving the fatigue strength of the welded structure. This is particularly important for applications that will experience repeated loads. Full penetration welding ensures that there are no residual gaps or incomplete fusion areas inside the welded area, effectively reducing the risk of corrosion and prolonging the service life of the equipment.

[0018] Further, the hole at the top of the pipe seat is located at the center of the pipe seat and is aligned with the center of the liquid phase pipe.

[0019] By adopting the above technical scheme, when the hole is located at the center of the pipe seat and is aligned with the center of the liquid-phase pipeline, it can be ensured that the fluid can uniformly enter or flow out of the pipeline, local overpressure or low-pressure areas caused by uneven flow are avoided, and the occurrence of turbulent flow is reduced, thereby reducing energy loss, and the center alignment design helps to maintain the stability and consistency of the entire system. During liquid transmission, this can prevent vibrations or other instability factors caused by asymmetric flow, ensuring the safety and smoothness of the equipment operation, and the center alignment design helps to more accurately control the flow and pressure of the fluid.

[0020] The utility model has the advantages of:

[0021] 1. The utility model discloses a pipe cover side wall hole design and four equal distribution liquid inlet hole, make low temperature liquid can enter the pipe cover inside from different directions evenly, effectively avoid the measurement error that single point liquid inlet can cause, and the center alignment design ensures that the fluid can uniformly enter or flow out of the pipeline, reduces the problem of turbulent flow and local pressure uneven, further improves the accuracy and stability of liquid level measurement, reduces the possibility of sensor false reading caused by bubbles or impurities;

[0022] 2. The utility model discloses that pipe cover, pipe seat and shell are connected by full welding and full penetration welding, not only strengthen the structural strength and sealing performance of whole device, significantly reduce the risk of loosening or separation caused by vibration or external force, and the pipe cover effectively prevents the impurities in the low-temperature storage tank from entering the liquid-phase pipeline, prevents the occurrence of blockage and sensor damage, prolongs the service life of the equipment, and reduces the maintenance and cleaning needs;

[0023] 3. The utility model discloses that the center alignment design helps to maintain the stability and consistency of the entire device, prevents vibrations or other instability factors caused by asymmetric flow, ensures the safety and smoothness of the equipment operation, and the good sealing performance is the key to ensure the normal operation of the system, and the full penetration welding provides excellent leakproof performance, thereby improving the overall safety and operation efficiency of the system, and also reducing potential safety hazards and operating costs. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall structure schematic diagram of the utility model;

[0025] Figure 2 It is the overall section along the vertical direction of the utility model device;

[0026] Figure 3 It is the top view of the utility model.

[0027] Among them: 1 - shell;2 - pipe cover;21 - liquid inlet hole;3 - pipe seat;4 - liquid-phase pipeline. DETAILED DESCRIPTION

[0028] The utility model will be explained in further detail below in combination with the drawings and specific preferred embodiments.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper part", "lower part" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of parts, so it cannot be understood as a limitation on the utility model. The specific dimensions used in the embodiment are only used to illustrate the technical scheme and do not limit the protection scope of the utility model.

[0030] Referring to Figure 1 , Figure 2 and Figure 3 , it can be known that the low-temperature storage tank liquid level measuring device comprises a shell 1, a pipe cover 2, a pipe seat 3 and a liquid phase pipeline 4, is fixed to the bottom of the low-temperature storage tank through welding and forms an integrated structure. The shell 1 is made of stainless steel material, is welded to the top of the low-temperature storage tank and is welded to the bottom of the pipe seat 3. The pipe cover 2 is sealingly connected to the inner wall of the shell 1 in the circumferential direction through a full welding process, four liquid inlet holes 21 are uniformly arranged in the side wall of the pipe cover 2, the center line of the liquid inlet hole 21 is 50 mm away from the top of the pipe cover 2 and is ensured to be lower than the top of the pipe seat 3, so as to prevent liquid from directly flowing into the pipe seat and the liquid phase pipeline 4. The pipe seat 3 is fixed to the bottom of the shell 1 through a full penetration welding process, one end is vertically inserted into the inside of the pipe cover 2 to a depth of 30 mm, and the other end extends to the outside of the shell and is connected to the liquid phase pipeline 4. The liquid phase pipeline 4 is inserted into the pipe seat 3, is connected to the outside liquid level meter through a 12 mm center hole in the top of the pipe seat 3, the axis alignment error is ensured to be not more than 0.5 mm, and the signal transmission is ensured to be accurate and reliable. The liquid inlet hole 21 is located in the middle and lower part of the side wall of the pipe cover 2, is 80 mm away from the bottom of the pipe cover and is 30 mm lower than the top of the pipe seat 3, is uniformly distributed along the horizontal circumferential direction, the central angle between adjacent liquid inlet holes 21 is 90°, four equal parts are realized, the uniform flow of liquid is ensured, the vortex disturbance is reduced, impurities such as ice crystals or particulate matter in the storage tank are intercepted, and the impurities are prevented from entering the liquid phase pipeline 4. In addition, the continuous full welding process is adopted between the pipe cover 2 and the shell 1, the welding seam width is 3 mm, and the sealing property in the low-temperature environment is ensured; and the full penetration welding with a bevel machining angle of 60° is adopted between the pipe seat 3 and the shell 1, and the air tightness and mechanical strength under extreme conditions are further ensured. This design not only ensures the accuracy of liquid level measurement, but also provides reliable anti-leakage and anti-clogging functions.

[0031] Working principle: through the precise fit of the pipe cover 2 and the pipe seat 3, high efficiency operation is realized. The pipe cover 2 is welded to the inner side of the shell 1, four liquid inlet holes 21 are evenly distributed on the side wall of the pipe cover 2, the hole diameter is small and the position is lower than the top of the pipe seat 3, which effectively prevents the backflow of liquid; one end of the pipe seat 3 extends into the inside of the pipe cover 2, and the other end is connected with the liquid phase pipeline 4, and a closed gasification space is formed between the two. Heat is transferred to the pipe seat 3 through the liquid phase pipeline 4, and then conducted into the inside of the pipe cover 2 by the pipe seat 3, so as to promote a small amount of low-temperature liquid to be rapidly gasified and maintain the pure gas phase state of the gasification space. The flow limiting effect of the liquid inlet hole 21 cooperates with the barrier effect of the pipe cover 2, effectively intercepts solid impurities and limits the liquid flow, and significantly reduces the risk of blockage. At the same time, the pressure in the gasification space and the static pressure at the bottom of the storage tank are dynamically balanced, the pressure signal is transmitted to the liquid phase pipeline 4 through the center hole at the top of the pipe seat 3, and is monitored in real time by the external differential pressure liquid level meter, so as to ensure that the pressure signal is accurate and reliable. The whole device adopts full welding and full penetration welding process, which ensures that the weld is leak-free at low temperature, has excellent sealing performance and reliability.

[0032] The preferred embodiments of the utility model are described in detail above, but the utility model is not limited to the specific details in the above embodiments, and various equivalent transformations of the technical solutions of the utility model can be carried out within the technical concept of the utility model, and these equivalent transformations all belong to the protection scope of the utility model.

Claims

1. A cryogenic storage tank level measuring device, used for measuring the level of a cryogenic storage tank, wherein the cryogenic storage tank level measuring device is welded to the cryogenic storage tank as a base for the cryogenic storage tank, characterized in that: It comprises a tube cover (2), a tube base (3), a shell (1) and a liquid phase pipeline (4); The tube cover (2) is welded inside the shell (1), and the side wall of the tube cover (2) is provided with an opening; The tube base (3) is welded at the bottom of the shell (1), one end of the tube base (3) is inserted into the tube cover (2), and the other end of the tube base (3) is located outside the shell (1); the liquid phase pipeline (4) is inserted into the tube base (3), and the top of the tube base (3) is provided with an opening.

2. Cryogenic tank level measuring apparatus according to claim 1, characterized in that: Four holes are formed in the side wall of the tube cover (2) as liquid inlet holes (21) of the tube cover (2), and the liquid inlet holes (21) are located below the top of the tube base (3).

3. Cryogenic tank level measuring apparatus according to claim 2, characterised in that: The four liquid inlet holes (21) divide the tube cover (2) into four equal parts, and the angle difference between the liquid inlet holes (21) along the horizontal circumferential direction is 90°.

4. The cryogenic tank level measuring apparatus of claim 1, wherein: The tube cover (2) and the shell (1) are welded together by full welding.

5. The cryogenic tank level measuring apparatus of claim 1, wherein: The tube base (3) and the shell (1) are welded together by full penetration welding.

6. The cryogenic tank level measuring apparatus of claim 1, wherein: The hole in the top of the tube base (3) is located at the center of the tube base (3) and is aligned with the center of the liquid phase pipeline (4).

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