High-precision capacitive liquid level sensor

Abstract

The utility model discloses a high-precision capacitive liquid level sensor which comprises a connecting plate, a threaded sleeve is arranged at the bottom of the connecting plate, an outer side pipe is connected to the interior of the threaded sleeve in a threaded mode, an inner probe and a guide rod are arranged at the bottom of the connecting plate, a threaded rod is further rotationally connected to the bottom of the connecting plate, and the outer side pipe is connected with the threaded rod in a threaded mode. The outer surface of the threaded rod is in threaded connection with two scraping plates, a guide sleeve is further arranged between the two scraping plates, and the outer surface of the inner probe is movably sleeved with the guide sleeve. Through the arrangement of the guide rod, the threaded rod, the scraping plate, the guide sleeve, the cleaning sleeve and other structures, when the outer surface of the inner probe and the inner wall of the outer side pipe are cleaned, scraped scale and oil can be discharged out of the outer side pipe, the situation that normal work of the inner probe is affected due to the fact that the scale and the oil are left and accumulated in the outer side pipe is avoided, and the service life of the inner probe is prolonged. And the accuracy of detecting the liquid level by the inner probe is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a high-precision capacitive liquid level sensor. Background Art

[0002] Liquid level sensor is a pressure sensor that measures liquid level. It can be divided into many types based on working principle and measurement method. Among them, capacitive liquid level sensor is widely used in petroleum, chemical, metallurgy, electric power, papermaking, pharmaceutical and other industries for real-time liquid level detection in large equipment due to its simple principle and low component cost.

[0003] For example, the utility model patent with application number 202220256443.7 discloses an anti-interference capacitive liquid level sensor, including a sensor head and a measuring component arranged at the bottom of the sensor head, the measuring component including an outer measuring tube and an inner probe, the outer measuring tube and the inner probe are coaxially arranged, a measuring cavity is formed between the outer measuring tube and the inner probe, a spiral scraper is arranged inside the measuring cavity, the inner side and outer side of the spiral scraper are respectively crimped with the outer surface of the inner probe and the inner wall of the outer measuring tube, and the utility model relates to the technical field of liquid level sensors. The anti-interference capacitive liquid level sensor is started by a motor at a fixed time, driving the gear and the gear ring to mesh and transmit, and then the spiral scraper is rotated to scrape the scale or oil on the outer surface of the inner probe and the inner wall of the outer measuring tube, and discharged through the bottom end of the shell, thereby completing the automatic removal of scale or oil from the liquid level sensor, which is more convenient and quicker than manual removal, and avoids the adhesion of scale or oil to the liquid level sensor, which reduces the detection accuracy of the liquid level sensor.

[0004] The above-mentioned device scrapes away scale and oil on the outer surface of the inner probe and the inner wall of the outer tube through the spiral scraper. However, since a liquid opening is provided on the spiral scraper, the scraped scale and oil can easily enter through the liquid opening and accumulate inside the measuring cavity, thereby affecting the detection work of the inner probe.

[0005] Therefore, it is necessary to provide a high-precision capacitive liquid level sensor to solve the above technical problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a high-precision capacitive liquid level sensor.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-precision capacitive liquid level sensor, including a connecting plate, a threaded sleeve is provided at the bottom of the connecting plate, the internal thread of the threaded sleeve is connected to the outer tube, an inner probe and a guide rod are provided at the bottom of the connecting plate, and the bottom of the connecting plate is also rotatably connected to a threaded rod, the outer surface of the threaded rod is threadedly connected to two scrapers, a guide sleeve is also provided between the two scrapers, the guide sleeve is movably sleeved on the outer surface of the inner probe, a cleaning sleeve is fixedly connected to the bottom of one of the scrapers, and the cleaning sleeve is movably sleeved on the outer surface of the inner probe, the top of the connecting plate is fixedly connected to a top cover, and a drive assembly is provided at the top of the connecting plate and inside the top cover.

[0008] As a further description of the above technical solution:

[0009] The two scrapers are both movably sleeved on the outer surface of the guide rod.

[0010] As a further description of the above technical solution:

[0011] The driving assembly includes a connecting shaft 1 and a connecting shaft 2 which are rotatably connected to the top of the connecting plate. The outer surface of the connecting shaft is sleeved with a gear 1, and the outer surface of the connecting shaft 2 is sleeved with a gear 2, and the gear 1 is meshed with the gear 2.

[0012] As a further description of the above technical solution:

[0013] The top of the connecting plate is also fixedly connected with a fixing frame, the top of the fixing frame is provided with a motor, and the output end of the motor is fixedly connected with one end of the second connecting shaft.

[0014] As a further description of the above technical solution:

[0015] The other end of the connecting shaft 1 is fixedly connected to the threaded rod.

[0016] As a further description of the above technical solution:

[0017] The outer surface of the outer tube is provided with a liquid inlet, and a filter screen is arranged inside the liquid inlet.

[0018] As a further description of the above technical solution:

[0019] An electrode base is arranged on the top of the connecting plate.

[0020] The utility model has the following beneficial effects:

[0021] 1. Compared with the prior art, this high-precision capacitive liquid level sensor, through the arrangement of structures such as guide rods, threaded rods, scrapers, guide sleeves and cleaning sleeves, can discharge the scraped scale and oil into the inner part of the outer tube when cleaning the outer surface of the inner probe and the inner wall of the outer tube, thereby preventing scale and oil from remaining and accumulating inside the outer tube and affecting the normal work of the inner probe, thereby improving the accuracy of the inner probe in detecting the liquid level.

[0022] 2. Compared with the prior art, this high-precision capacitive liquid level sensor, through the setting of the liquid inlet and the filter, when the outer surface of the inner probe and the inner wall of the outer tube are scraped, the liquid can enter the interior of the outer tube through the liquid inlet, and under the action of the filter, the impurities contained in the entering liquid are intercepted to prevent entering the interior of the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a high-precision capacitive liquid level sensor proposed by the utility model;

[0024] Figure 2 This is a structural schematic diagram of a connecting shaft 1 and a connecting shaft 2 of a high-precision capacitive liquid level sensor proposed by the utility model;

[0025] Figure 3 This is a structural schematic diagram of a guide rod and a threaded rod of a high-precision capacitive liquid level sensor proposed by the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of a liquid inlet, a filter screen, etc. of a high-precision capacitive liquid level sensor proposed by the utility model.

[0027] Legend:

[0028] 1. Connecting plate; 2. Threaded sleeve; 3. Outer tube; 4. Inner probe; 5. Guide rod; 6. Threaded rod; 7. Scraper; 8. Guide sleeve; 9. Cleaning sleeve; 10. Top cover; 11. Connecting shaft 1; 12. Connecting shaft 2; 13. Gear 1; 14. Gear 2; 15. Fixed bracket; 16. Motor; 17. Liquid inlet; 18. Filter; 19. Electrode base. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Reference Figure 1-4 The utility model provides a high-precision capacitive liquid level sensor: it includes a connecting plate 1, a threaded sleeve 2 is provided at the bottom of the connecting plate 1, the inner thread of the threaded sleeve 2 is connected to the outer tube 3, an inner probe 4 and a guide rod 5 are provided at the bottom of the connecting plate 1, and a threaded rod 6 is rotatably connected to the bottom of the connecting plate 1, and two scrapers 7 are threadedly connected to the outer surface of the threaded rod 6, and a guide sleeve 8 is provided between the two scrapers 7, and the guide sleeve 8 is movably sleeved on the outer surface of the inner probe 4, and a cleaning sleeve 9 is fixedly connected to the bottom of one of the scrapers 7, and the cleaning sleeve 9 is movably sleeved on the outer surface of the inner probe 4, and a top cover 10 is fixedly connected to the top of the connecting plate 1, and a driving assembly is provided on the top of the connecting plate 1 and inside the top cover 10, and the two scrapers 7 are movably sleeved on the outer surface of the guide rod 5, and an electrode base 19 is provided on the top of the connecting plate 1.

[0031] The driving assembly includes a connecting shaft 11 and a connecting shaft 12 which are rotatably connected to the top of the connecting plate 1. The outer surface of the connecting shaft is sleeved with a gear 13, and the outer surface of the connecting shaft 12 is sleeved with a gear 2 14. The gear 13 is meshed with the gear 2 14.

[0032] A fixing frame 15 is also fixedly connected to the top of the connecting plate 1, and a motor 16 is arranged on the top of the fixing frame 15. The output end of the motor 16 is fixedly connected to one end of the connecting shaft 2 12, and the other end of the connecting shaft 11 is fixedly connected to the threaded rod 6. The motor 16 drives the connecting shaft 2 12 and the gear 2 14 to rotate, thereby driving the gear 13 meshing therewith to rotate, and then driving the connecting shaft 11 and the threaded rod 6 to rotate, so that the scraper 7 rotates inside the outer tube 3.

[0033] A liquid inlet 17 is provided on the outer surface of the outer tube 3, and a filter screen 18 is provided inside the liquid inlet 17. Through the arrangement of the liquid inlet 17 and the filter screen 18, when the outer surface of the inner probe 4 and the inner wall of the outer tube 3 are scraped, the liquid can enter the interior of the outer tube 3 through the liquid inlet 17, and the impurities contained in the entering liquid are intercepted by the filter screen 18 to prevent them from entering the interior of the outer tube 3.

[0034] Working principle: When in use, put the device into the liquid to be detected, and the liquid can enter the inner part through the opening at the bottom end of the outer tube 3, and the liquid can be detected through the inner probe 4. When it is necessary to clean the inner wall of the outer tube 3 and the outer surface of the inner probe 4, start the motor 16 to drive the connecting shaft 2 12 and the gear 2 14 to rotate, thereby driving the meshing gear 13 to rotate, and then driving the connecting shaft 11 and the threaded rod 6 to rotate. Under the rotation of the threaded rod 6 and the guiding action of the guide rod 5, the two scrapers 7, the guide sleeve 8 and the cleaning The cleaning sleeve 9 moves downward, and the inner wall of the outer tube 3 is scraped by the two scrapers 7. At the same time, the cleaning sleeve 9 scrapes the outer surface of the inner probe 4. In the process of the scrapers 7 moving, since the circumferential surfaces of the two scrapers 7 are in contact with the inner wall of the outer tube 3, the external liquid will enter the interior of the outer tube 3 through the liquid inlet 17, and the scale and oil will be pushed out of the outer tube 3 by the scraper 7 at the bottom after being scraped off, thereby discharging impurities and preventing scale and oil from remaining and accumulating inside the outer tube 3 and affecting the detection work of the inner probe 4.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision capacitive liquid level sensor, comprising a connecting plate (1), characterized in that: A threaded sleeve (2) is provided at the bottom of the connecting plate (1), and the inner thread of the threaded sleeve (2) is connected to the outer tube (3). An inner probe (4) and a guide rod (5) are provided at the bottom of the connecting plate (1), and a threaded rod (6) is rotatably connected to the bottom of the connecting plate (1). Two scrapers (7) are threadedly connected to the outer surface of the threaded rod (6), and a guide sleeve (8) is provided between the two scrapers (7). The guide sleeve (8) is movably sleeved on the outer surface of the inner probe (4), and a cleaning sleeve (9) is fixedly connected to the bottom of one of the scrapers (7), and the cleaning sleeve (9) is movably sleeved on the outer surface of the inner probe (4). A top cover (10) is fixedly connected to the top of the connecting plate (1), and a driving component is provided at the top of the connecting plate (1) and inside the top cover (10).

2. A high-precision capacitive liquid level sensor according to claim 1, characterized in that: The two scrapers (7) are both movably sleeved on the outer surface of the guide rod (5).

3. A high-precision capacitive liquid level sensor according to claim 1, characterized in that: The driving assembly comprises a connecting shaft 1 (11) and a connecting shaft 2 (12) which are rotatably connected to the top of the connecting plate (1); a gear 1 (13) is sleeved on the outer surface of the connecting shaft; a gear 2 (14) is sleeved on the outer surface of the connecting shaft 2 (12); and the gear 1 (13) is meshed with the gear 2 (14).

4. A high-precision capacitive liquid level sensor according to claim 3, characterized in that: The top of the connecting plate (1) is also fixedly connected to a fixing frame (15), and the top of the fixing frame (15) is provided with a motor (16), and the output end of the motor (16) is fixedly connected to one end of the second connecting shaft (12).

5. A high-precision capacitive liquid level sensor according to claim 3, characterized in that: The other end of the connecting shaft 1 (11) is fixedly connected to the threaded rod (6).

6. A high-precision capacitive liquid level sensor according to claim 1, characterized in that: The outer surface of the outer tube (3) is provided with a liquid inlet (17), and a filter screen (18) is arranged inside the liquid inlet (17).

7. A high-precision capacitive liquid level sensor according to claim 1, characterized in that: An electrode base (19) is arranged on the top of the connecting plate (1).

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