An ultralow-temperature magnetostrictive liquid level meter probe

Abstract

The utility model discloses a kind of super-low temperature magnetostrictive liquid level meter probe, the super-low temperature magnetostrictive liquid level meter probe includes probe part and probe stem part;The probe stem part includes: outer tube component;Inner tube component is set in the outer tube component;Ground end connecting piece is connected to one end of the outer tube component, and is connected with the probe part, through hole is provided on the ground end connecting piece, the through hole is communicated with the outer tube component, and is communicated with the probe part;Air extraction passage is set on the lateral wall of the ground end connecting piece, and the air extraction passage is communicated with the through hole;Check valve structure is set in the air extraction passage, to block the air extraction passage, and open when extracting air in outer tube component. It solves the problem that existing magnetostrictive liquid level meter is prone to form condensate in probe stem under super-low temperature environment, which causes waveguide wire to rust, thereby affecting the service life of liquid level meter.

Description

Technical Field

[0001] This disclosure relates to the field of measurement technology, and in particular to a cryogenic magnetostrictive level gauge probe. Background Technology

[0002] A magnetostrictive level gauge is a type of magnetostrictive level and displacement sensor. Current magnetostrictive level gauges have a probe rod containing a waveguide wire with magnetostrictive properties. A float containing a magnetic ring is mounted on the probe rod. A current pulse generator, strain pulse detection circuit, and electronic units are located at the top of the probe rod. During measurement, the current pulse generator first applies a current pulse to the waveguide wire to form a circular magnetic field, which propagates downwards along the waveguide wire. When this magnetic field encounters the magnetic field formed by the magnetic ring in the float, the two magnetic fields superimpose, generating a strain pulse that propagates to both ends of the waveguide wire. When it reaches the top of the probe rod, it is received by the strain pulse detection circuit. The distance information can be determined based on the current pulse generation time and the strain pulse reception time, thereby obtaining the liquid level information. This liquid level information is then transmitted through the electronic unit for display on the control panel.

[0003] However, current magnetostrictive level gauges are prone to condensation inside the probe when monitoring substances in ultra-low temperature environments. For example, when monitoring liquid nitrogen or LNG tanks, the temperature can drop to -100°C. During use, condensation easily forms inside the probe. This condensation, when it adheres to the waveguide wire, causes wear and tear, making the waveguide wire prone to rusting. This affects subsequent normal monitoring and reduces the lifespan of the waveguide wire, thus shortening the service life of the magnetostrictive level gauge.

[0004] Therefore, there is an urgent need for a magnetostrictive level gauge that can be used for a long time in ultra-low temperature environments. Utility Model Content

[0005] The purpose of this disclosure is to provide a cryogenic magnetostrictive level gauge probe that solves the problem that existing magnetostrictive level gauges are prone to condensation inside the probe rod in cryogenic environments, which leads to rusting of the waveguide wire and affects the service life of the level gauge.

[0006] To achieve the above objectives, the first aspect of this disclosure provides a cryogenic magnetostrictive level gauge probe, comprising a probe portion and a probe rod portion; The probe section includes: outer tube components; An inner tube component is disposed within the outer tube component; A ground connector is connected to one end of the outer tube component and to the probe part. The ground connector is provided with a through hole, which communicates with the outer tube component and the probe part. An air extraction channel is provided on the side wall of the ground connector, and the air extraction channel is connected to the through hole; A one-way valve structure is installed in the air extraction channel to block the air extraction channel and to open when air is extracted from the outer pipe component.

[0007] In some embodiments, the air extraction channel includes a first channel and a second channel that are interconnected, wherein the diameter of the first channel is larger than the diameter of the second channel, and the second channel is connected to the through hole. The one-way valve structure includes: A connecting rod is provided through the first channel, and a limit ring is provided on the side wall at the bottom of the connecting rod; A sealing block is integrally connected to the bottom of the connecting rod and extends into the second channel. The outer wall of the sealing block is tightly fitted to the second channel to seal the second channel. A locking sleeve is fixed to the upper end of the first channel, and the upper end of the connecting rod passes through the locking sleeve. A spring is sleeved onto the connecting rod, with its upper end abutting against the locking sleeve and its lower end abutting against the limiting ring plate, so that the limiting ring plate is pressed against the bottom wall of the first channel by the elastic force of the spring.

[0008] In some embodiments, the one-way valve structure includes a sealing ring fitted onto the connecting rod and located between the limiting ring and the sealing block, so that after the spring presses the limiting ring, the sealing ring is pressed against the bottom wall of the first channel.

[0009] In some embodiments, the outer wall of the locking sleeve is provided with an external thread, the inner wall of the first channel is provided with an internal thread, and the locking sleeve is threadedly connected to the first channel.

[0010] In some embodiments, the end of the sealing block away from the connecting rod is conical.

[0011] In some embodiments, the cryogenic magnetostrictive level gauge probe further includes a sealing plate, and the ground connector is provided with an installation groove at the upper edge of the first channel, and the sealing plate is sealed and fixed in the installation groove.

[0012] In some embodiments, a connecting plate is fixed to one end of the inner tube component. After the inner tube component extends into the outer tube component, the connecting plate is disposed against one side of the ground connector, and the connecting plate is fixed to the ground connector by bolts.

[0013] In some embodiments, the cryogenic magnetostrictive level gauge probe further includes a connector tube, the inner wall of which is provided with an internal thread, and the outer wall of the ground connector is provided with an external thread, the ground connector being threaded into the connector tube.

[0014] In some embodiments, the probe portion includes: Electronic unit, A fixed housing is connected to the connector tube, and the electronic unit is disposed inside the fixed housing; The top cover is fixed to the fixed housing to enclose the electronic unit inside the fixed housing.

[0015] By adopting the above technical solution and utilizing the air extraction channel and one-way valve structure, when the magnetostrictive level gauge is installed and put into use, the vacuum structure pipeline can be installed at the air extraction channel. At this time, all the air in the outer tube component, inner tube component, and probe can be extracted through the air extraction channel, so that the outer tube component is kept in a vacuum state. Then, due to the action of the one-way valve, air is prevented from flowing back into the outer tube component, so that the internal vacuum state is continuously maintained. Even when monitoring in an ultra-low temperature environment, no water will condense in the outer tube component, thereby avoiding water condensation from corroding the waveguide wire and other components, improving their service life, and enabling the magnetostrictive level gauge to work for a long time in an ultra-low temperature environment, which can fully meet the needs of ultra-low temperature environment monitoring.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the magnetostrictive level gauge probe provided by this utility model.

[0019] Figure 2 This utility model provides Figure 1 Enlarged view of point A above.

[0020] Figure 3This is an exploded structural diagram of the magnetostrictive level gauge probe provided by this utility model.

[0021] Figure 4 This is an exploded structural diagram of the one-way valve structure of the magnetostrictive level gauge probe provided by this utility model.

[0022] Explanation of reference numerals in the attached figures: 1. Top cover; 2. Electronic unit; 3. Fixed housing; 4. Connector tube; 41. Magnetic float; 42. Limiting ring; 5. Outer tube component; 6. Inner tube component; 61. Connecting plate; 7. Ground connector; 71. Through hole; 72. Air extraction channel; 721. First channel; 722. Second channel; 8. One-way valve structure; 81. Connecting rod; 82. Limiting ring; 83. Sealing block; 84. Locking sleeve; 85. Spring; 86. Sealing ring; 9. Sealing plate. Detailed Implementation

[0023] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0024] This disclosure provides a cryogenic magnetostrictive level gauge probe, such as... Figure 1-4 As shown, the cryogenic magnetostrictive level gauge probe includes a probe section and a probe rod section. The probe rod section includes an outer tube component 5, an inner tube component 6, a ground connector 7, an air extraction channel 72, and a one-way valve structure 8. The inner tube component 6 is disposed inside the outer tube component 5. The ground connector 7 is connected to one end of the outer tube component 5 and to the probe section, thus connecting the outer tube component 5 and the probe section. Furthermore, a through hole 71 is provided on the ground connector 7, communicating with both the outer tube component 5 and the probe section. The air extraction channel 72 is disposed on the side wall of the ground connector 7 and communicates with the through hole 71. The one-way valve structure 8 is disposed within the air extraction channel 72 to seal the air extraction channel 72 and opens when air is extracted from the outer tube component 5.

[0025] With the above-described structure, when the magnetostrictive level gauge is installed and put into use, the vacuum system pipeline can be installed at the air extraction channel 72. If a vacuum pump is used for extraction, all the air in the outer tube component 5, inner tube component 6, and probe section can be extracted through the air extraction channel 72, keeping the outer tube component 5 in a vacuum state. Then, due to the action of the one-way valve, air can be prevented from flowing back into the outer tube component 5, thus maintaining a continuous vacuum state inside. Even when monitoring in an ultra-low temperature environment, no condensation will occur in the outer tube component 5, thereby avoiding corrosion of the waveguide wire and other components by condensation, improving their service life, and enabling the magnetostrictive level gauge to work for a long time in an ultra-low temperature environment, fully meeting the needs of ultra-low temperature environment monitoring.

[0026] It should be noted that the inner tube component 6 can be fixedly installed with a waveguide wire structure, and a magnetic float 41 can be slidably sleeved on the outer tube component 5. In addition, a limit ring 42 can be fixedly connected to the bottom of the outer tube component 5 to prevent the magnetic float 41 from falling off the outer tube component 5.

[0027] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the above-mentioned air extraction channel 72 includes a first channel 721 and a second channel 722 that are interconnected. The diameter of the first channel 721 is larger than the diameter of the second channel 722. The second channel 722 is connected to the through hole 71. The one-way valve structure 8 includes a connecting rod 81, a sealing block 83, a locking sleeve 84, and a spring 85. The connecting rod 81 is disposed through the first channel 721. A limiting ring 82 is fixedly connected to the side wall at the bottom of the connecting rod 81. The sealing block 83 is integrally connected to the bottom of the connecting rod 81 and extends into the second channel 722. The outer wall of the sealing block 83 is tightly disposed against the second channel 722 to close the second channel 722. The locking sleeve 84 is fixed to the upper end of the first channel 721. The upper end of the connecting rod 81 passes through the locking sleeve 84, and there is a certain gap between the connecting rod 81 and the inner wall of the locking sleeve 84. The spring 85 is sleeved on the connecting rod 81. The upper end of the spring 85 abuts against the locking sleeve 84, and the lower end abuts against the limiting ring 82, so that the limiting ring 82 is pressed against the bottom wall of the first channel 721 by the elastic force of the spring 85.

[0028] Using this structure, when vacuuming is required, the vacuuming structure's pipe is installed at the first channel 721 for evacuation. The suction force of the vacuuming structure causes the connecting rod 81 to move upwards and further compress the spring 85. This causes the sealing block 83 to move upwards and disengage from the second channel 722. Thus, air inside the outer tube component 5 is extracted through the gap between the second channel 722, the first channel 721, the locking sleeve 84, and the connecting rod 81, creating a vacuum inside the outer tube component 5. Once evacuation is complete and a vacuum is maintained inside the outer tube component 5, evacuation stops. The spring force of the spring 85 applies pressure to the limiting plate, causing the sealing block 83 to re-enter the second channel 722 to seal it, preventing the outer tube component 5 from contacting the outside and maintaining a vacuum.

[0029] Furthermore, such as Figure 2 As shown, the above-mentioned one-way valve structure 8 includes a sealing ring 86, which is sleeved on the connecting rod 81 and located between the limiting ring 82 and the sealing block 83, so that after the spring 85 presses the limiting ring 82, the sealing ring 86 is pressed against the bottom wall of the first channel 721.

[0030] By utilizing the sealing ring 86, the seal between the limiting ring 82 and the bottom wall of the first channel 721 can be further improved, thereby enhancing the sealing performance at this location.

[0031] like Figure 2 and Figure 4 As shown, the outer wall of the locking sleeve 84 is provided with external threads, and the inner wall of the first channel 721 is provided with internal threads. The locking sleeve 84 is threadedly connected to the first channel 721.

[0032] In this way, the locking sleeve 84 can be stably fixed in the first channel 721. At the same time, when installing the connecting rod 81 and other structures, the position of the locking sleeve 84 in the first channel 721 can be easily adjusted according to the elastic force of the spring 85, so as to ensure that the elastic force of the spring 85 is sufficient to press the limiting ring 82 against the bottom wall of the first channel 721.

[0033] Furthermore, the end of the aforementioned sealing block 83 furthest from the connecting rod 81 is conical.

[0034] By setting the end of the sealing block 83 to a conical shape, the sealing block 83 can be easily inserted into the second channel 722 when the connecting rod 81 moves up and down, thus avoiding the situation where the edge of the sealing block 83 gets stuck to the bottom wall of the first channel 721.

[0035] In some embodiments, such as Figure 1 , Figure 2 and Figure 3As shown, the ultra-low temperature magnetostrictive level gauge probe also includes a sealing plate 9. An installation groove is provided at the upper edge of the ground connector 7 located in the first channel 721, and the sealing plate 9 is sealed and fixed in the installation groove.

[0036] Specifically, the sealing plate 9 can be sealed and welded to the installation groove.

[0037] In this way, the first channel 721 can be further sealed, making the entire air extraction channel 72 sealed and ensuring that the outer tube component 5 is in a vacuum state.

[0038] In some embodiments, such as Figure 1 and Figure 3 As shown, a connecting plate 61 is fixedly connected to one end of the inner tube component 6. After the inner tube component 6 extends into the outer tube component 5, the connecting plate 61 is set to fit against one side of the ground end connector 7, and the connecting plate 61 is fixed to the ground end connector 7 by bolts.

[0039] By using the connecting plate 61, the inner tube component 6 can be stably fixed inside the outer tube component 5, and the installation is also relatively convenient.

[0040] In some embodiments, such as Figure 1 and Figure 3 As shown, the cryogenic magnetostrictive level gauge probe also includes a connector tube 4, with an internal thread on the inner wall of the connector tube 4 and an external thread on the outer wall of the ground connector 7, which is threaded into the connector tube 4.

[0041] This allows for a better connection between the connector tube 4 and the ground connector 7, making installation and disassembly more convenient, and the connection is also more stable.

[0042] like Figure 1 and Figure 3 As shown, the probe includes an electronic unit 2, a fixed housing 3, and a top cover 1. The fixed housing 3 is connected to the connector tube 4. The electronic unit 2 is fixedly installed inside the fixed housing 3. The top cover 1 is fixedly connected to the fixed housing 3 to enclose the electronic unit 2 inside the fixed housing 3.

[0043] By using the top cover 1 and the fixed housing 3, the electronic unit 2 can be completely enclosed to provide good protection for the electronic unit 2 and other components. At the same time, the fixed housing 3 is connected to the connector tube 4 so that the probe part and the probe rod part are connected to each other.

[0044] It should be noted that the part of the connector tube 4 connected to the ground connector 7 and the part connected to the fixed housing 3 can be sealed by welding. At the same time, the upper cover 1 and the fixed housing can also be sealed by welding after being connected, so as to prevent these positions from communicating with the outside and causing air to enter the outer tube component 5.

[0045] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0047] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cryogenic magnetostrictive level gauge probe, characterized in that, Includes the probe section and the probe rod section; The probe section includes: outer tube components; An inner tube component is disposed within the outer tube component; A ground connector is connected to one end of the outer tube component and to the probe part. The ground connector is provided with a through hole, which communicates with the outer tube component and the probe part. An air extraction channel is provided on the side wall of the ground connector, and the air extraction channel is connected to the through hole; A one-way valve structure is installed in the air extraction channel to block the air extraction channel and to open when air is extracted from the outer pipe component.

2. The cryogenic magnetostrictive level gauge probe according to claim 1, characterized in that, The air extraction channel includes a first channel and a second channel that are interconnected. The diameter of the first channel is larger than the diameter of the second channel, and the second channel is connected to the through hole. The one-way valve structure includes: A connecting rod is provided through the first channel, and a limit ring is provided on the side wall at the bottom of the connecting rod; A sealing block is integrally connected to the bottom of the connecting rod and extends into the second channel. The outer wall of the sealing block is tightly fitted to the second channel to seal the second channel. A locking sleeve is fixed to the upper end of the first channel, and the upper end of the connecting rod passes through the locking sleeve. A spring is sleeved onto the connecting rod, with its upper end abutting against the locking sleeve and its lower end abutting against the limiting ring plate, so that the limiting ring plate is pressed against the bottom wall of the first channel by the elastic force of the spring.

3. The cryogenic magnetostrictive level gauge probe according to claim 2, characterized in that, The one-way valve structure includes a sealing ring, which is sleeved on the connecting rod and located between the limiting ring and the sealing block, so that after the spring presses the limiting ring, the sealing ring is pressed tightly against the bottom wall of the first channel.

4. The cryogenic magnetostrictive level gauge probe according to claim 2, characterized in that, The outer wall of the locking sleeve is provided with external threads, and the inner wall of the first channel is provided with internal threads. The locking sleeve is threadedly connected to the first channel.

5. The cryogenic magnetostrictive level gauge probe according to claim 2, characterized in that, The end of the sealing block furthest from the connecting rod is conical.

6. The cryogenic magnetostrictive level gauge probe according to claim 2, characterized in that, The cryogenic magnetostrictive level gauge probe also includes a sealing plate. The ground connector is provided with an installation groove at the upper edge of the first channel, and the sealing plate is sealed and fixed in the installation groove.

7. The cryogenic magnetostrictive level gauge probe according to claim 1, characterized in that, One end of the inner tube component is fixed with a connecting plate. After the inner tube component extends into the outer tube component, the connecting plate is set to fit against one side of the ground end connector, and the connecting plate is fixed to the ground end connector by bolts.

8. The cryogenic magnetostrictive level gauge probe according to claim 1, characterized in that, The cryogenic magnetostrictive level gauge probe also includes a connector tube, the inner wall of which is provided with an internal thread, and the outer wall of the ground connector is provided with an external thread, the ground connector being threaded into the connector tube.

9. The cryogenic magnetostrictive level gauge probe according to claim 8, characterized in that, The probe portion includes: Electronic unit, A fixed housing is connected to the connector tube, and the electronic unit is disposed inside the fixed housing; The top cover is fixed to the fixed housing to enclose the electronic unit inside the fixed housing.

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