Magnetostriction liquid level meter special for LNG spherical tank liquid level measurement

Abstract

The invention discloses a magnetostrictive liquid level meter specially used for measuring the liquid level of an LNG spherical tank. The magnetostrictive liquid level meter specially used for measuring the liquid level of the LNG spherical tank comprises an electronic unit, a liquid level sensor and a control unit, the probe part is electrically connected with the electronic unit through a cable; the protective tube component comprises a head tube, a tail tube and a plurality of connecting tubes which are detachably connected between the head tube and the tail tube in sequence, and the probe component extends into the protective tube component; the fixing part is arranged on the head pipe and used for fixing the pipe protecting part to a spherical tank; the magnetic floater is arranged on the outer wall of one connecting pipe in a sleeving mode and used for being matched with the probe component to induce a magnetic field so as to determine the position of the liquid level in the spherical tank. The magnetostrictive liquid level meter solves the problems that when an existing magnetostrictive liquid level meter probe for the LNG spherical tank is fixed to the spherical tank, labor is wasted, and when faults occur and maintenance and replacement are needed, natural gas in the tank needs to be transferred, and consequently consumption is huge.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of measurement, in particular to a magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement. BACKGROUND

[0002] The LNG spherical tank is a low-temperature spherical pressure vessel specially used for storing liquefied natural gas (LNG), with a working temperature of -162℃. It adopts a double-layer vacuum insulation structure design. The inner tank is made of austenitic stainless steel or 9% nickel steel to resist the deep cold environment. The outer layer is a carbon steel protective layer filled with insulating materials such as pearlite sand and vacuumed to a vacuum degree of ≤0.08Pa to ensure an ultra-low evaporation rate. Its typical capacity can reach 2500 cubic meters, the design temperature range is -196℃ to +50℃, the design pressure is 0.8MPa, and the safety valve starts at an overpressure of 0.7bar.

[0003] The LNG spherical tank has the characteristics of high pressure and low temperature, and the temperature cannot be raised. In general, it is not allowed to stop production and maintenance. Moreover, the tank body is very high, and when the internal liquid level needs to be measured, a magnetostrictive liquid level meter needs to be used for monitoring. In order to cope with the monitoring of the LNG spherical tank, a probe as long as ten meters needs to be installed, and auxiliary facilities such as a hoist are needed for installation, which is very costly. After the probe is extended into the spherical tank by the hoist, it can be fixed to the spherical tank. At the same time, when transporting the ten-meter-long probe, it is also relatively troublesome due to its length. In addition, if the probe fails and needs to be repaired, the natural gas in the LNG spherical tank needs to be transferred away before the probe can be replaced and repaired, which will inevitably cause greater consumption loss, and there is also a certain risk in the process of transferring the natural gas.

[0004] Therefore, there is an urgent need for a magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement, which is convenient to install on the LNG spherical tank and convenient to transport, and can realize the repair or replacement of the probe without transferring the natural gas when the probe fails. SUMMARY

[0005] The purpose of the present disclosure is to provide a magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement, which solves the problem that the existing magnetostrictive liquid level meter probe for LNG spherical tank is difficult to fix to the spherical tank, and when it fails and needs to be repaired and replaced, the natural gas in the tank needs to be transferred away, resulting in huge consumption.

[0006] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement, comprising: an electronic unit; a probe component electrically connected to the electronic unit through a cable; A protecting pipe component, including a first pipe, a tail pipe and a plurality of connecting pipes which are detachably connected to the first pipe and the tail pipe in sequence, the probe component extends into the protecting pipe component; A fixing member is arranged on the first pipe for fixing the protecting pipe component to the spherical tank; A magnetic float is arranged on the outer wall of one of the connecting pipes for determining the liquid level in the spherical tank by cooperating with the magnetic field of the probe component.

[0007] In some embodiments, one end of the connecting pipe is formed with an internally threaded pipe portion, and the other end is formed with a necked pipe portion which is provided with an external thread, and in the adjacent two connecting pipes, the necked pipe portion of one of the connecting pipes is inserted into the internally threaded pipe portion of the other connecting pipe; The wall of the end of the first pipe which is connected to the connecting pipe is provided with an internal thread, and the necked pipe portion of the connecting pipe is threadedly connected to the first pipe; The end of the tail pipe which is connected to the connecting pipe is provided with an external thread, and the tail pipe is threadedly connected to the internal thread of the connecting pipe.

[0008] In some embodiments, the end of the first pipe is fixedly provided with a mounting pipe member; The probe component is externally covered with a bellows which is provided with a sleeve, and after the probe component extends into the protecting pipe component, the sleeve is cooperatively connected into the mounting pipe member.

[0009] In some embodiments, the tail pipe is provided with a weight.

[0010] In some embodiments, the fixing member includes a fixing flange which is fixedly connected to the first pipe.

[0011] In some embodiments, the magnetostrictive liquid level meter which is specially used for LNG spherical tank liquid level measurement further includes: A base, the electronic unit is arranged in the base; A joint pipe which is detachably connected to the base at one end and connected to the probe component at the other end; The cable of the probe component is electrically connected to the electronic unit through the joint pipe.

[0012] In some embodiments, the probe component is provided with a mounting head which is provided with an external thread; The inner wall of the joint pipe is provided with an internal thread, and the mounting head is threadedly connected into the joint pipe, and the end of the probe component extends into the joint pipe.

[0013] In some embodiments, a fastening screw is arranged on the outer wall of the joint pipe, which penetrates the joint pipe and abuts to the mounting head.

[0014] In some embodiments, the magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement further comprises an upper cover which is detachably fixed to the base to enclose the electronic unit into the base.

[0015] By adopting the technical scheme, the first pipe is installed on the spherical tank first, and then the connecting pipes and the tail pipes are installed step by step, so that a sealed pipe protection component is formed in the spherical tank, and then the probe component is inserted into the pipe protection component to complete the installation, so that the crane and excessive auxiliary equipment are not needed during installation, and the workers only need to install the first pipe and then install each connecting pipe and tail pipe step by step, which is convenient and simple to install, saves a lot of installation time, and greatly reduces the installation cost. In addition, since the connecting pipe is installed step by step, the liquid level meter can be transported by using a common vehicle, which saves a lot of transportation cost.

[0016] In addition, when the probe component and other structures are damaged, the probe component can be disassembled outside the spherical tank for treatment, which does not cause leakage of the LNG spherical tank, so that the gas in the LNG spherical tank does not need to be transferred, the consumption of transferring the gas in the tank can be avoided, and dangerous accidents caused by transferring the natural gas can also be avoided.

[0017] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure.

[0019] In the drawings: Figure 1 is a schematic diagram of the overall structure of the magnetostrictive liquid level meter provided by the present application.

[0020] Figure 2 is an exploded structural schematic diagram of the magnetostrictive liquid level meter provided by the present application.

[0021] Figure 3 is an exploded structural schematic diagram of the probe component and other structures of the magnetostrictive liquid level meter provided by the present application.

[0022] Figure 4 is an exploded structural schematic diagram of the pipe protection component of the magnetostrictive liquid level meter provided by the present application.

[0023] Description of reference numerals: 1. Upper cover; 2. Electronic unit; 3. Base; 4. Connecting pipe; 5. Fastening screws; 6. Ferrule; 7. Probe component; 71. Bellows; 72. Mounting head; 8. Protective pipe component; 81. Head pipe; 82. Connecting pipe; 821. Internally threaded pipe; 822. Reduced pipe; 83. Tail pipe; 84. Mounting fittings; 9. Magnetic float; 10. Weight; 11. Coarse nut; 12. Fixing flange. DETAILED DESCRIPTION

[0024] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0025] The present invention provides a magnetostrictive level gauge specifically for measuring the liquid level of an LNG spherical tank. Figures 1-4 As shown, the magnetostrictive level gauge specifically used for measuring the liquid level of an LNG spherical tank includes an electronic unit 2, a probe component 7, a protective tube component 8, a fixing part, and a magnetic float 9, wherein the probe component 7 is electrically connected to the electronic unit 2 via a cable to transmit the induced signal to the electronic unit 2 and output it through the electronic unit 2. The protective tube component 8 includes a head tube 81, a tail tube 83, and a plurality of connecting tubes 82 that are detachably connected to the head tube 81 and the tail tube 83 in sequence, and the probe component 7 can be inserted into the protective tube component 8. In addition, the fixing part is provided on the head tube 81 to fix the protective tube component 8 to the spherical tank, and the magnetic float 9 is sleeved on the outer wall of one of the connecting tubes 82 to cooperate with the probe component 7 to induce a magnetic field and determine the position of the liquid level in the spherical tank.

[0026] By the arrangement of the structure, when the liquid level meter is installed on the LNG spherical tank, the first pipe 81 is first installed on the spherical tank through the fixing member, then the connecting pipes 82 are installed on the first pipe 81 step by step according to the requirement, until the connecting pipe 82 of the predetermined length is installed, then the tail pipe 83 is connected to the last connecting pipe 82, so as to form a pipeline of the predetermined length and airtight in the spherical tank, thus the sealed pipe protection component 8 is formed in the spherical tank, so that the probe component 7 of the liquid level meter can be inserted into the pipe protection component 8, and the magnetic float 9 is sleeved on the connecting pipe 82, finally the electronic unit 2 and the probe component 7 are electrically connected to complete the installation, so that the magnetostrictive liquid level meter is installed on the spherical tank. In the installation process, a crane and too many auxiliary equipment are not needed, only the first pipe 81 is installed by the staff, then the connecting pipes 82 are installed step by step, which is convenient to install, and the length of the pipe protection component 8 can be determined according to the required length, a lot of installation time is saved, and the installation cost is greatly reduced. In addition, since the connecting pipes 82 are installed step by step, the length of each connecting pipe is short, when the liquid level meter is transported, only a common vehicle can be used to transport the liquid level meter, without using the special vehicle for transporting the original liquid level meter of more than ten meters long, so a lot of transportation cost is saved.

[0027] Further, since the first pipe 81 of the pipe protection component 8 is fixed to the spherical tank through the fixing member, at least part of the first pipe 81 is located outside the spherical tank after the first pipe 81 is fixed by the fixing member, so that when the probe component 7 is inserted into the pipe protection component 8, the installation can be realized outside the spherical tank, so when the probe component 7 and other structures are damaged and need to be repaired or replaced, the probe component 7 can be disassembled outside the spherical tank, in this process, the LNG spherical tank is not leaked, so the gas in the LNG spherical tank does not need to be transferred, the probe component 7 can be directly disassembled and repaired, so that the transfer of the natural gas in the tank can be avoided, and the risk accident caused by the transfer of the natural gas can also be avoided.

[0028] It should be noted that the magnetic float 9 is slidably sleeved on the connecting pipe 82, so that the magnetic float 9 can slide on the first pipe 81, the connecting pipe 82 and the tail pipe 83, so as to determine the liquid level of the liquefied natural gas in the spherical tank according to the position of the magnetic float 9.

[0029] In some embodiments, as Figure 2 , Figure 3 and Figure 4As shown, the connecting pipe 82 is formed with an internally threaded pipe portion 821 at one end and a necked pipe portion 822 at the other end, and the necked pipe portion 822 is provided with external threads. In the two adjacent connecting pipes 82, the necked pipe portion 822 of one connecting pipe 82 is screwed into the internally threaded pipe portion 821 of the other connecting pipe 82, so that the connecting pipes 82 are connected to each other. In addition, the first pipe 81 is provided with internal threads at the end connected to the connecting pipe 82, and the necked pipe portion 822 of the connecting pipe 82 is screwed into the first pipe 81. The tail pipe 83 is provided with external threads at the end connected to the connecting pipe 82, and the tail pipe 83 is screwed into the connecting pipe 82.

[0030] With the above structure, when the connecting pipe 82 and the tail pipe 83 are installed, the threaded connection of the connecting pipe 82 or the tail pipe 83 is completed by screwing, and the splicing of the protective pipe assembly 8 is achieved, so that the installation is more convenient. At the same time, the connection mode can make the sealing between the first pipe 81, the connecting pipe 82 and the tail pipe 83 better, and reduce the possibility of liquefied natural gas leaking into the protective pipe assembly 8.

[0031] Further, sealing ring structures are arranged between the two adjacent connecting pipes 82, and between the first pipe 81, the connecting pipe 82 and the tail pipe 83, so as to further improve the sealing between the first pipe 81, the connecting pipe 82 and the tail pipe 83, and greatly avoid the leakage of liquefied natural gas.

[0032] It should be noted that the bottom of the tail pipe 83 is a closed structure, i.e. the end of the tail pipe 83 away from the connecting pipe 82 is a closed structure, so that after the tail pipe 83 is installed on the connecting pipe 82, the liquefied natural gas in the spherical tank will not enter the tail pipe 83.

[0033] In some embodiments, as shown in Figure 1 , Figure 3 and Figure 4 , the end of the first pipe 81 is fixedly provided with a mounting pipe 84, and a bellows 71 is arranged outside the probe assembly 7. The bellows 71 is fixedly connected with a sleeve 6, and after the probe assembly 7 is inserted into the protective pipe assembly 8, the sleeve 6 is connected into the mounting pipe 84.

[0034] With the arrangement of the bellows 71, the probe assembly 7 can be well protected. In addition, through the cooperation of the sleeve 6 and the mounting pipe 84, the probe assembly 7 can be stably arranged in the protective pipe assembly 8, and the probe assembly 7 is prevented from being interfered by other conditions.

[0035] The form of the cooperation connection between the sleeve 6 and the installation pipe 84 can be various, such as buckle connection, threaded connection, etc. In the present disclosure, threads are arranged on the sleeve 6 and the installation pipe 84 respectively, and when installed, the sleeve 6 is screwed into the installation pipe 84, thus ensuring the connection between the sleeve 6 and the installation pipe 84.

[0036] In some embodiments, as shown in Figure 1 and Figure 4 A heavy hammer 10 is arranged on the tail pipe 83.

[0037] With the arrangement of the heavy hammer 10, the heavy pipe component 8 can be provided with a certain gravity, so as to maintain the verticality of the heavy pipe component 8 as a whole.

[0038] It should be noted that the heavy hammer 10 can be directly fixed to the tail pipe 83, or can be detachably installed on the tail pipe 83 through an installation structure. For example, a hole is formed in the heavy hammer 10, a coarse thread nut 11 is fixedly arranged in the hole, and a threaded rod is fixedly arranged at the tail end of the tail pipe 83, so that the threaded rod is connected to the coarse thread nut 11 of the heavy hammer 10, thereby connecting the heavy hammer 10 to the tail pipe 83, thereby giving the heavy pipe component 8 a vertical downward gravity to ensure its verticality.

[0039] In some embodiments, as shown in Figure 1 The fixing member includes a fixing flange 12 fixedly connected to the head pipe 81.

[0040] Since the LNG spherical tank currently has a flange structure reserved for installation of a liquid level meter, after the fixing flange 12 is arranged on the head pipe 81, the fixing flange 12 can be fixed to the flange structure reserved on the spherical tank by using a bolt during subsequent installation, which is easy to install and can effectively ensure the connection stability.

[0041] In some embodiments, as shown in Figure 1 and Figure 3 The magnetostrictive liquid level meter specially used for LNG spherical tank liquid level measurement further includes a base 3 and a joint pipe 4. The electronic unit 2 is fixedly arranged in the base 3, and the joint pipe 4 is detachably connected to the base 3 at one end and connected to the probe component 7 at the other end. The cable of the probe component 7 is electrically connected to the electronic unit 2 through the joint pipe 4.

[0042] With the arrangement of the joint pipe 4 and the base 3, the probe component 7 and the electronic unit 2 can be better connected, and the electronic unit 2 and the connected cable can be protected, so that the signal monitored by the probe component 7 can be better transmitted to the electronic unit 2. In addition, after a fault occurs, the joint pipe 4 and other structures can be easily detached for maintenance.

[0043] Furthermore, a mounting head 72 is fixedly provided on the above-mentioned probe component 7, and an external thread is provided on the mounting head 72. In addition, an internal thread is provided on the inner wall of the joint pipe 4. The mounting head 72 can be threadedly connected to the joint pipe 4, and the end of the probe component 7 extends into the joint pipe 4.

[0044] In this way, the probe component 7 can be easily installed in the joint pipe 4, and it is also convenient to disassemble and assemble.

[0045] like Figure 3 As shown, a fastening screw 5 is provided on the outer wall of the joint pipe 4 , and the fastening screw 5 passes through the joint pipe 4 and abuts against the mounting head 72 .

[0046] By setting the fastening screw 5 , the mounting head 72 can be further fixed to prevent the mounting head 72 from rotating and causing the probe component 7 to be separated.

[0047] In addition, if Figure 1 and Figure 3 As shown, an external thread is provided on the outer wall of the joint pipe 4 , and an internal thread is provided on the inner wall of one end of the base 3 connected to the joint pipe 4 , and the joint pipe 4 can be threadedly connected to the base 3 .

[0048] In this way, a detachable connection between the joint pipe 4 and the base 3 is achieved, and it is also convenient during installation and disassembly.

[0049] In some embodiments, as Figure 1 and Figure 3 As shown, the magnetostrictive level gauge specifically used for LNG spherical tank liquid level measurement further includes an upper cover 1 , which is detachably fixed to the base 3 to seal the electronic unit 2 inside the base 3 .

[0050] By utilizing the upper cover 1 , the base 3 can be completely covered, thereby completely enclosing the electronic unit 2 , thereby providing good protection for the electronic unit 2 and other components.

[0051] Among them, an internal thread is provided on the inner wall of the upper cover 1, and an external thread is provided on the outer wall of the base 3. The upper cover 1 is threadedly connected to the base 3, thereby realizing a closed installation of the upper cover 1.

[0052] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0053] It should be further noted that various specific technical features described in the above specific embodiments can be combined in any suitable manner, and the disclosure will not be repeated here for various possible combinations.

[0054] In addition, various different embodiments of the disclosure can also be combined with each other as long as they do not contradict the idea of the disclosure, and they should also be considered as disclosed by the disclosure.

Claims

1. A magnetostrictive level gauge specially used for LNG spherical tank level measurement, characterized in that: include: Electronic unit; a probe component, electrically connected to the electronic unit via a cable; A protective tube component includes a head tube, a tail tube, and a plurality of connecting tubes detachably connected to the head tube and the tail tube in sequence, and the probe component extends into the protective tube component; A fixing member is provided on the head pipe and is used to fix the protective tube component to the spherical tank; The magnetic float is sleeved on the outer wall of one of the connecting pipes to cooperate with the probe component to induce a magnetic field and determine the position of the liquid level in the spherical tank.

2. The magnetostrictive level gauge specifically for LNG spherical tank level measurement according to claim 1 is characterized in that: One end of the connecting pipe is formed with an internal threaded pipe portion, and the other end is formed with a constricted pipe portion, the constricted pipe portion is provided with an external thread, and in two adjacent connecting pipes, the constricted pipe portion of one connecting pipe is inserted into the internal threaded pipe portion of the other connecting pipe; An internal thread is provided on the wall of one end of the head pipe connected to the connecting pipe, and the necked pipe portion of the connecting pipe is threadedly connected to the head pipe; One end of the tail pipe connected to the connecting pipe is provided with an external thread, and the tail pipe is threadedly connected to the internal thread of the connecting pipe.

3. The magnetostrictive level gauge specifically for LNG spherical tank level measurement according to claim 1 is characterized in that: The end of the head pipe is fixedly provided with a mounting pipe fitting; The probe component is covered with a bellows on the outside, and a ferrule is provided on the bellows. After the probe component is inserted into the protective tube component, the ferrule is fitted and connected to the installation pipe.

4. The magnetostrictive level gauge specifically for LNG spherical tank level measurement according to claim 1 is characterized in that: A heavy hammer is provided on the tail pipe.

5. The magnetostrictive level gauge specifically used for LNG spherical tank level measurement according to claim 1 is characterized in that: The fixing member includes a fixing flange, and the fixing flange is fixedly connected to the head pipe.

6. The magnetostrictive level gauge specifically used for LNG spherical tank liquid level measurement according to claim 1 is characterized in that: The magnetostrictive level gauge specifically used for LNG spherical tank liquid level measurement also includes: a base, wherein the electronic unit is disposed in the base; A connector tube, one end of which is detachably connected to the base and the other end of which is connected to the probe component; Wherein, the cable of the probe component passes through the joint tube and is electrically connected to the electronic unit.

7. The magnetostrictive level gauge specifically for LNG spherical tank liquid level measurement according to claim 6 is characterized in that: The probe component is provided with a mounting head, and the mounting head is provided with an external thread; An internal thread is provided on the inner wall of the joint pipe, the mounting head is threadedly connected to the inside of the joint pipe, and the end of the probe component extends into the inside of the joint pipe.

8. The magnetostrictive level gauge specifically used for LNG spherical tank liquid level measurement according to claim 7 is characterized in that: A fastening screw is provided on the outer wall of the joint pipe, and the fastening screw passes through the joint pipe and abuts against the mounting head.

9. The magnetostrictive level gauge specifically used for LNG spherical tank liquid level measurement according to claim 6 is characterized in that: The magnetostrictive liquid level gauge specifically used for LNG spherical tank liquid level measurement further includes an upper cover, which is detachably fixed to the base to seal the electronic unit within the base.

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