A multi-leak-proof liquid level measuring device under high temperature and high pressure conditions

Abstract

This invention discloses a multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions, comprising a measuring cylinder, an upper branch pipe, a lower branch pipe, an electrode, a junction box, and a secondary instrument. The measuring cylinder is connected to the device being measured via the upper and lower branch pipes. The electrode is mounted on the measuring cylinder and connected to the junction box. The electrode includes an electrode core, an electrode core connecting seat, an insulating sleeve, an electrode mounting seat, a sealing welding seat, and an electrode cap. The electrode core is placed on the electrode core connecting seat and is covered by an insulating sleeve. An electrode mounting seat is provided outside the electrode core connecting seat and the insulating sleeve. A sealing welding seat and an electrode cap are sequentially provided below the electrode mounting seat. A first O-ring is provided between the electrode core and the insulating sleeve, and a second O-ring is provided between the insulating sleeve and the electrode mounting seat. A sealing unit is provided between the electrode cap, the sealing welding seat, the electrode mounting seat, and the electrode core connecting seat. The secondary instrument is connected to the junction box via an output cable. This invention has the advantages of corrosion resistance, leak prevention, and small size.

Description

Technical Field

[0001] This invention relates to a measuring device, specifically a multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions. Background Technology

[0002] Currently, electrical contact level measuring devices are commonly used in ships to measure liquid levels. These devices typically have relatively long electrodes, increasing the volume of the measuring cylinder. To ensure accuracy, a thick insulation layer is usually applied to the outside of the cylinder, further increasing its size. This increased cylinder volume results in a large overall size for the electrical contact level measuring device, making it unsuitable for use in the confined spaces of ship cabins. Furthermore, commercially available, smaller electrodes often lack corrosion and leak-proof features, making them prone to high-temperature, high-pressure steam leakage after prolonged use, posing a serious threat to personnel and equipment safety. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions. This measuring device has the advantages of corrosion resistance, leak prevention, and small size.

[0004] The technical solution adopted in this invention is:

[0005] A multi-layer leak-proof liquid level measuring device under high temperature and high pressure conditions includes a measuring cylinder, an upper branch pipe, a lower branch pipe, electrodes, a junction box, and secondary instruments.

[0006] The upper part of the measuring cylinder is connected to the gas phase end of the measured device through an upper branch pipe; the lower part of the measuring cylinder is connected to the liquid phase end of the measured device through a lower branch pipe; bellows shut-off valves are provided on the upper and lower branch pipes.

[0007] Multiple electrodes are mounted on the measuring cylinder and connected to a connector on the side of the junction box via electrode cables. Each electrode includes an electrode core, an electrode core connector, an insulating sleeve, an electrode mounting base, a sealing welding base, and an electrode cap. The electrode core is placed on the electrode core connector and covered by an insulating sleeve. An electrode mounting base is provided outside the electrode core connector and the insulating sleeve. The sealing welding base is placed below the electrode mounting base. The electrode cap includes a cap body and a protrusion placed on the cap body. The cap body is placed below the sealing welding base, and the protrusion extends into the sealing welding base. A first O-ring is provided between the electrode core and the insulating sleeve, and a second O-ring is provided between the insulating sleeve and the electrode mounting base. A sealing unit is provided between the electrode cap, the sealing welding base, the electrode mounting base, and the electrode core connector.

[0008] The junction box is installed on the measuring cylinder;

[0009] The secondary instrument is connected to the output cable of the junction box; when the liquid level does not exceed the electrode, the electrical signal is transmitted to the secondary instrument through the cable for calculation and display.

[0010] According to the above scheme, the sealing unit includes, from bottom to top, a wiring sealing rubber, a sealing ceramic, and a sealing welding ring;

[0011] The wiring sealing rubber is placed on the electrode cap and inside the sealing welding seat; the sealing ceramic is placed between the electrode mounting seat and the electrode core connecting seat; the sealing welding ring has an L-shaped cross-section, with one end in contact with the electrode core connecting seat and the other end in contact with the sealing ceramic.

[0012] According to the above scheme, the upper surface of the bump has a V-shaped protrusion in the middle, and the lower surface of the wiring sealing rubber has a V-shaped groove in the middle, which is adapted to the V-shaped protrusion.

[0013] According to the above scheme, the electrode core connector is clamped by a U-shaped spring.

[0014] According to the above scheme, multiple electrodes are arranged at non-equidistant intervals on the measuring cylinder.

[0015] According to the above scheme, electrodes close to the normal operating water level are arranged at intervals of 20-30mm, and electrodes far from the normal operating water level are arranged at intervals of 45-55mm, while ensuring that the arrangement of electrodes takes into account both the upper and lower alarm water level positions.

[0016] According to the above scheme, the center distance between the upper and lower branch pipes is 800-1000mm; the upper end of the measuring cylinder is equipped with a plug, and the lower end is equipped with a drain valve.

[0017] According to the above scheme, the secondary instrument includes a power supply module, a signal conversion module, a display module, and an alarm module; the power supply module supplies power to the electrodes, the display module, the alarm module, and the signal conversion module; the electrodes transmit the collected signals to the signal conversion module, the signal conversion module processes the signals and transmits them to the display module for display; the signal conversion module transmits the data to the alarm module, and the alarm module issues an alarm signal when it detects an abnormality.

[0018] According to the above scheme, the display module includes a columnar analog instrument, and the liquid level height is displayed intuitively through the instrument.

[0019] According to the above scheme, the secondary instrument also includes a monitoring module for monitoring the electrode status. This monitoring module is connected to the power supply module and the LED on the columnar analog instrument; the LED turns off when the electrode fails. The secondary instrument can convert the monitored electrode level signal into a 4–20 mA analog signal for external transmission.

[0020] The measuring cylinder and junction box function as a liquid level measuring device, pressure-bearing device, and cable management unit. High-temperature, high-pressure liquid is introduced into the measuring cylinder through liquid and gas phase branch pipes (upper and lower branch pipes). The measuring cylinder is machined for high pressure resistance. The junction box converts the power supply lines for multiple electrodes into a single cable output. The measuring cylinder is covered with multiple electrodes capable of liquid level measurement; the measurement range can be customized according to project requirements.

[0021] The beneficial effects of this invention are as follows:

[0022] The use of specially designed electrodes reduces the size of the liquid level measuring device (by nearly half the size of electrodes used for conventional high-temperature and high-pressure media), making the liquid level measuring device suitable for use in the confined space of ship cabins.

[0023] The electrode adopts a multi-layered leak-proof design, which effectively prevents high-temperature and high-pressure liquid leakage caused by electrochemical corrosion, and has strong safety.

[0024] The electrodes employ high-temperature resistant O-rings, sealing ceramics, and wiring sealing rubber to ensure zero leakage. Simultaneously, multiple sealing methods are used to reduce the length of the electrode core extending into the measuring cylinder and the external sealing section, thus achieving electrode miniaturization.

[0025] The electrodes are not welded, which avoids electrochemical corrosion caused by the difference between the solder and the electrode material, thus increasing the service life of the electrodes.

[0026] The secondary instrument has the functions of electrode power supply, local liquid level display, fault electrode alarm, and remote signal transmission, making it very convenient to use. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the connection structure between the multi-layer leak-proof liquid level measuring device and the equipment under high temperature and high pressure conditions.

[0029] Figure 2 This is a schematic diagram of a multi-layered leak-proof liquid level measuring device (secondary instrument) under high temperature and high pressure conditions;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the electrode;

[0031] Figure 4 This is a schematic cross-sectional view of the electrode;

[0032] In the diagram: 1. Electrode core, 2. Insulating sleeve, 3. Electrode mounting base, 4. Sealed welding base, 5. Electrode core connecting base, 6. Sealing ceramic, 7. U-shaped spring, 8. Electrode gland, 8.1. Gland body, 8.2. Protrusion, 9. Wiring sealing rubber, 10. First O-ring, 11. Second O-ring, 12. Sealed welding ring, 13. Measuring cylinder, 14. Junction box, 15. Bellows stop valve, 16. Drain valve, 17. Plug, 18. Secondary instrument, 19. Cable, 20. Measuring device, 21. Upper branch pipe, 22. Lower branch pipe, 23. Electrode. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] See Figures 1-4 A multi-layer leak-proof liquid level measuring device under high temperature and high pressure conditions includes a measuring cylinder 13, an upper branch pipe 21, a lower branch pipe 22, electrodes 23, a junction box 14, and a secondary instrument 18. The upper part of the measuring cylinder 14 is connected to the gas phase end of the measured device 20 via the upper branch pipe 21 with a bellows shut-off valve 15; the center distance between the upper branch pipe 21 and the lower branch pipe 22 is 900mm; the lower part of the measuring cylinder 14 is connected to the liquid phase end of the measured device 20 via the lower branch pipe 22 with a bellows shut-off valve 15. A plug 17 is provided at the upper end of the measuring cylinder 14, and a drain valve 16 is provided at the lower end. There are 23 electrodes 23, arranged non-equally at intervals on the measuring cylinder 13 (electrodes near the normal operating water level are spaced 25mm apart, and electrodes farther from the normal operating water level are spaced 50mm apart, while ensuring that the electrode arrangement takes into account both upper and lower alarm water level positions). All electrodes 23 are connected to a connector on the side of the junction box 14 via cables 19. Junction box 14 is connected to secondary instrument 18 via cable 19. When the liquid level does not exceed electrode 23, an electrical signal is transmitted to secondary instrument 18 via cable 19 for calculation and display. In this embodiment, secondary instrument 18 is the FDL-200 instrument from Beijing Fisherport Technology Development Co., Ltd. This instrument uses a light bar to display the liquid level. The light bar consists of two colors of light-emitting diodes: green indicates that the electrode is submerged, yellow indicates that the electrode is not submerged, and the light being off indicates that electrode 23 is faulty.

[0035] In this embodiment, each electrode 23 includes an electrode core 1, an electrode core connecting seat 5, an insulating sleeve 2, an electrode mounting seat 3, a sealing welding seat 4, and an electrode cap 8. The electrode core 1 is placed on the electrode core connecting seat 5, and the insulating sleeve 2 is fitted over it. The electrode core connecting seat 5 is clamped by a U-shaped spring 7. The electrode mounting seat 3 is provided outside the electrode core connecting seat 5 and the insulating sleeve 2. The sealing welding seat 4 is placed under the electrode mounting seat 3; the electrode cap 8 includes a cap body 8.1 and a protrusion 8.2 placed on the cap body 8.1. The cap body 8.1 is placed under the sealing welding seat 4, and the protrusion 8.2 extends into the sealing welding seat 4. The middle part of the upper surface of the protrusion 8.2 is a V-shaped protrusion. A first O-ring 10 is provided between the electrode core 1 and the insulating sleeve 2, and a second O-ring 11 is provided between the insulating sleeve 2 and the electrode mounting seat 3. A sealing unit is provided between the electrode cap 8, the sealing welding seat 4, the electrode mounting seat 3, and the electrode core connecting seat 5. This sealing unit includes, from bottom to top, a wiring sealing rubber 9, a sealing ceramic 6, and a sealing welding ring 12. The wiring sealing rubber 9 is placed on the electrode cap 8 and inside the sealing welding seat 4, and a V-shaped groove is provided in the middle of the lower surface of the wiring sealing rubber 9, which matches a V-shaped protrusion. The sealing ceramic 6 is placed between the electrode mounting seat 3 and the electrode core connecting seat 5. The sealing welding ring 12 has an L-shaped cross-section, with one end contacting the electrode core connecting seat 5 and the other end contacting the sealing ceramic 6.

[0036] In this embodiment, the electrode 23 cable 19 enters the internal hub through the aviation plug on the side of the junction box 14, and then outputs to the secondary instrument 18 through the aviation plug at the bottom of the junction box 14 via a multi-core cable. The electrode core 1 and the electrode core mounting base 3 are connected by a snap-fit ​​mechanism to ensure conductivity, and are also clamped by a U-shaped spring 7) to effectively prevent the electrode core from falling off.

[0037] In this embodiment, electrode 23 incorporates multiple leak-proof and miniaturized designs. Firstly, the portion of electrode 23 in contact with the high-temperature, high-pressure medium is not welded with solder to reduce electrochemical corrosion. Simultaneously, two layers of high-temperature resistant O-rings (first O-ring 10 and second O-ring 11 in the figure) are used for sealing between electrode core 1 and insulating sleeve 2, and between insulating sleeve 2 and electrode mounting base 3. Secondly, the electrode wiring connection is sealed with sealing ceramic 6, sealing welding ring 12, and wiring sealing rubber 9, ensuring that even if the first sealing fails, leakage of the high-temperature, high-pressure medium is still prevented. This step-by-step sealing method effectively reduces the length of the sealing section, achieving a miniaturized electrode design.

[0038] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions, characterized in that: Includes measuring cylinder, upper branch pipe, lower branch pipe, electrodes, junction box, and secondary instruments; The upper part of the measuring cylinder is connected to the gas phase end of the measured device through an upper branch pipe; the lower part of the measuring cylinder is connected to the liquid phase end of the measured device through a lower branch pipe; bellows shut-off valves are provided on the upper and lower branch pipes. Multiple electrodes are mounted on the measuring cylinder and connected to a connector on the side of the junction box via electrode cables. Each electrode includes an electrode core, an electrode core connector, an insulating sleeve, an electrode mounting base, a sealing welding base, and an electrode cap. The electrode core is placed on the electrode core connector and covered by an insulating sleeve. An electrode mounting base is provided outside the electrode core connector and the insulating sleeve. The sealing welding base is located below the electrode mounting base. The electrode cap includes a cap body and a protrusion placed on the cap body. The cap body is located below the sealing welding base, and the protrusion extends into the sealing welding base. The upper surface of the protrusion has a V-shaped protrusion in the middle. A second electrode core is provided between the electrode core and the insulating sleeve. An O-ring is provided, and a second O-ring is provided between the insulating sleeve and the electrode mounting base; a sealing unit is provided between the electrode cap, the sealing welding base, the electrode mounting base, and the electrode core connecting base; the sealing unit includes, from bottom to top, a wiring sealing rubber, a sealing ceramic, and a sealing welding ring; the wiring sealing rubber is placed on the electrode cap and inside the sealing welding base; a V-shaped groove is provided in the middle of the lower surface of the wiring sealing rubber, and the V-shaped groove is adapted to a V-shaped protrusion; the sealing ceramic is placed between the electrode mounting base and the electrode core connecting base; the sealing welding ring has an L-shaped cross-section, with one end contacting the electrode core connecting base and the other end contacting the sealing ceramic; The junction box is installed on the measuring cylinder; The secondary instrument is connected to the output cable of the junction box; when the liquid level does not exceed the electrode, the electrical signal is transmitted to the secondary instrument through the cable for calculation and display.

2. The multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions according to claim 1, characterized in that: The electrode core connector is clamped by a U-shaped spring.

3. The multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions according to claim 1, characterized in that: Multiple electrodes are arranged at unequal intervals on the measuring cylinder.

4. The multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions according to claim 3, characterized in that: Electrodes near the normal operating water level are arranged at intervals of 20-30mm, while electrodes far from the normal operating water level are arranged at intervals of 45-55mm. At the same time, the arrangement of electrodes should take into account both the upper and lower alarm water level positions.

5. The multi-layered leak-proof liquid level measuring device under high temperature and high pressure conditions according to claim 1, characterized in that: The center distance between the upper and lower branch pipes is 800-1000mm; the upper end of the measuring cylinder is equipped with a plug, and the lower end is equipped with a drain valve.

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