Bubbling type differential pressure liquid level sensor

Abstract

The utility model relates to the technical field of liquid level sensors, and discloses a bubbling type differential pressure liquid level sensor which comprises a sealing shell and an annular threaded groove, the upper end face and the lower end face of the sealing shell are fixedly connected with an air inlet pipe and a position measuring pipe respectively, and the lower end of the air inlet pipe penetrates through the sealing shell to the interior and is fixedly connected with a connecting pipe. Precise pressure regulating valves are fixedly connected to the upper portions of the inner walls of the two sides of the sealing shell, the two ends of the connecting pipe are fixedly connected to the two precise pressure regulating valves respectively, and a differential pressure transmitter is fixedly connected to the lower portion of the inner wall of one side of the sealing shell. According to the liquid level meter, the purpose of better liquid level monitoring can be achieved through the arranged pressure difference detection structure, bubbling is conducted through process gas, and the situations that the surface of a common liquid level meter is stuck and blocked by viscous materials, the liquid level meter is buried by sediment materials, and measurement errors such as surface liquid level fluctuation can be fully avoided; and meanwhile, by arranging a protection structure, the influence of external sundries on the device can be avoided, and better usability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a bubbling type differential pressure liquid level sensor. Background Art

[0002] The differential pressure level sensor is a device used to measure the height of a liquid or the position of a liquid interface. It determines the height or depth of the liquid level by measuring the pressure difference at two different heights above and below the liquid. The differential pressure level sensor is widely used in industrial process control, such as chemical, pharmaceutical, food processing and other fields. It is used to monitor and control the liquid level in liquid storage tanks, reactors, water tanks and other equipment.

[0003] The existing device may be unstable during measurement, and the measuring tube at the lower end may cause measurement errors due to sticky materials blocking the surface of the common level gauge, deposited materials burying the level gauge, surface level fluctuations, etc. Therefore, those skilled in the art provide a bubbling pressure differential level sensor to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and the proposed bubbling type pressure difference liquid level sensor can achieve the purpose of better liquid level monitoring by means of the set pressure difference detection structure, and utilizes the process gas for bubbling, which can fully avoid the measurement errors such as the sticky materials sticking to the surface of the conventional liquid level gauge, the deposited materials burying the liquid level gauge, the surface liquid level fluctuation, etc. At the same time, the protective structure set can avoid the influence of external debris on the device, and has better usability.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The bubbling type differential pressure liquid level sensor comprises a sealed shell, the upper and lower end surfaces of the sealed shell are respectively fixedly connected with an air inlet pipe and a position measuring tube, the lower end of the air inlet pipe passes through the sealed shell to the inside and is fixedly connected with a connecting pipe, the upper part of the inner walls on both sides of the sealed shell are fixedly connected with precision pressure regulating valves, the two ends of the connecting pipe are respectively fixedly connected to two precision pressure regulating valves, a differential pressure transmitter is fixedly connected to the lower part of the inner wall of one side of the sealed shell, the lower ends of the two precision pressure regulating valves are respectively fixedly connected with a three-way pipe and a matching pipe, the lower end of the matching pipe is fixedly connected to the differential pressure transmitter, one end of the three-way pipe is fixedly connected to the lower end surface of the differential pressure transmitter, the lower end of the three-way pipe is fixedly connected to the position measuring tube, and an output module is fixedly arranged inside the sealed shell;

[0007] The upper end surface of the air intake pipe is fixedly connected with a fixing cylinder, the upper end of the fixing cylinder is provided with a mounting ring, and the inner fixing sleeve of the mounting ring is provided with a protective net;

[0008] Through the above technical scheme, when in use, two precision pressure regulating valves are used to call up a consistent pressure, and one pressure is sent to the pressure measuring port A of the differential pressure transmitter as a reference pressure signal. The gas path from the other precision pressure regulating valve is connected to a three-way pipe, one of which is connected to the B port of the differential pressure transmitter and the other is connected to a level measuring tube with micropores. The level measuring tube is inserted into the liquid level to a certain depth. When the liquid level changes, the pressure of the level measuring tube bubbling to the outside will change accordingly. The differential pressure transmitter reads the pressure difference, outputs a signal, and displays the pressure difference liquid level. The process gas is used for bubbling, which can fully avoid measurement errors such as sticky materials sticking to the surface of the commonly used liquid level gauge, deposited materials burying the liquid level gauge, and surface liquid level fluctuations. The protective net set on the air inlet pipe can avoid the problem of damage to internal components caused by the intervention of external debris, and has better protection.

[0009] Furthermore, an annular thread groove is formed on the upper end surface of the fixing cylinder, a threaded collar is fixedly connected to the lower end surface of the mounting ring, and the threaded collar is threadedly sleeved in the annular thread groove;

[0010] Through the above technical solution, the threaded sleeve of the threaded ring in the annular thread groove can achieve the purpose of convenient loading and unloading of the installation ring, thereby achieving the purpose of convenient replacement and rapid injection of compressed air, with better usability and efficiency.

[0011] Furthermore, a connecting bracket is fixedly connected to one side of the differential pressure transmitter, and the connecting bracket is fixedly connected to the output module;

[0012] Through the above technical solution, the purpose of better limiting installation of the output module can be achieved by providing a connecting bracket.

[0013] Further, the differential pressure transmitter is electrically connected to the output module;

[0014] Through the above technical solution, the purpose of information output can be achieved through the electrical connection between the differential pressure transmitter and the output module.

[0015] Furthermore, sealing rings are fixedly connected at the centers of the upper and lower end surfaces of the sealing housing, and the air inlet pipe and the positioning tube are fixedly sleeved in the corresponding sealing rings respectively;

[0016] Through the above technical solution, the provided sealing ring can achieve a better sealing effect on the connection between the air intake pipe and the positioning tube and the sealing housing.

[0017] Furthermore, the sealing ring is made of rubber material;

[0018] Through the above technical solution, the purpose of high-strength use can be achieved by using the sealing ring made of rubber material.

[0019] Furthermore, the sealing shell is made of stainless steel;

[0020] Through the above technical solution, the problem of corrosion caused by placing the device in liquid can be avoided by using a sealed shell made of stainless steel.

[0021] The utility model has the following beneficial effects:

[0022] 1. The bubbling differential pressure level sensor proposed by the utility model, when in use, uses two precision pressure regulating valves to adjust the consistent pressure, one pressure is sent to the pressure measuring port A of the differential pressure transmitter as a reference pressure signal, and the gas path from the other precision pressure regulating valve is connected to a three-way pipe, one of which is connected to the B port of the differential pressure transmitter, and the other is connected to a level measuring tube with micropores. The level measuring tube is inserted into the liquid level to a certain depth. When the liquid level changes, the pressure of the level measuring tube bubbling to the outside will change accordingly. The differential pressure transmitter reads the pressure difference, outputs a signal, and displays the pressure difference level. The process gas is used for bubbling, which can fully avoid measurement errors such as sticky materials blocking the surface of the commonly used level gauge, deposited materials burying the level gauge, and surface level fluctuations.

[0023] 2. The bubbling type differential pressure level sensor proposed by the utility model can avoid the problem of damage to internal components caused by the interference of external debris through the protective net arranged on the air inlet pipe, and has better protection. At the same time, the threaded sleeve of the threaded ring in the annular thread groove can achieve the purpose of convenient loading and unloading of the installation ring, thereby achieving the purpose of convenient replacement and rapid injection of compressed air, and has better usability and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an axonometric diagram of the bubbling pressure differential liquid level sensor proposed by the utility model;

[0025] Figure 2 It is a front cross-sectional schematic diagram of the bubbling type differential pressure liquid level sensor proposed by the utility model;

[0026] Figure 3 for Figure 2 An enlarged schematic diagram of the structure at A;

[0027] Figure 4 It is an exploded schematic diagram of the connection between the fixing cylinder and the mounting ring of the bubbling type differential pressure liquid level sensor proposed by the utility model;

[0028] Figure 5 This is a schematic diagram of the working process of the bubbling pressure differential liquid level sensor proposed in the utility model.

[0029] Legend:

[0030] 1. Sealed housing; 2. Air inlet pipe; 3. Connecting pipe; 4. Precision pressure regulating valve; 5. Tee pipe; 6. Matching pipe; 7. Connecting bracket; 8. Output module; 9. Differential pressure transmitter; 10. Position measuring tube; 11. Fixing tube; 12. Mounting ring; 13. Threaded collar; 14. Annular thread groove; 15. Protective net; 16. Sealing ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the specific implementation of the utility model to clearly and completely describe the technical solutions in the specific implementation of the utility model. Obviously, the specific implementation described is only a part of the specific implementation of the utility model, not all of the specific implementation. Based on the specific implementation of the utility model, all other specific implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1-5 A specific implementation mode provided by the utility model: a bubbling type differential pressure liquid level sensor, comprising a sealed shell 1, the sealed shell 1 is made of stainless steel, and the sealed shell 1 made of stainless steel can avoid the problem of easy corrosion caused by placing the device in the liquid, the upper and lower end surfaces of the sealed shell 1 are respectively fixedly connected with the air intake pipe 2 and the position measuring tube 10, and the centers of the upper and lower end surfaces of the sealed shell 1 are fixedly connected with sealing rings 16, the air intake pipe 2 and the position measuring tube 10 are respectively fixedly sleeved in the corresponding sealing rings 16, and the provided sealing rings 16 can achieve a better sealing effect on the connection between the air intake pipe 2 and the position measuring tube 10 and the sealed shell 1, and the sealing ring 16 is made of rubber material, and the purpose of high-strength use can be achieved by using the sealing ring 16 made of rubber material, the lower end of the air intake pipe 2 passes through the sealed shell 1 to the inside and is fixedly connected with a connecting pipe 3, and the inner parts on both sides of the sealed shell 1 Precision pressure regulating valves 4 are fixedly connected to the upper part of the wall, and the two ends of the connecting pipe 3 are fixedly connected to the two precision pressure regulating valves 4 respectively. A differential pressure transmitter 9 is fixedly connected to the lower part of the inner wall of one side of the sealed housing 1. The lower ends of the two precision pressure regulating valves 4 are fixedly connected to a three-way pipe 5 and a matching pipe 6 respectively. The lower end of the matching pipe 6 is fixedly connected to the differential pressure transmitter 9. One end of the three-way pipe 5 is fixedly connected to the lower end surface of the differential pressure transmitter 9. The lower end of the three-way pipe 5 is fixedly connected to the position measuring tube 10. An output module 8 is fixedly arranged inside the sealed housing 1. A connecting bracket 7 is fixedly connected to one side of the differential pressure transmitter 9. The connecting bracket 7 is fixedly connected to the output module 8. The purpose of better limiting installation of the output module 8 can be achieved by setting the connecting bracket 7. The differential pressure transmitter 9 is electrically connected to the output module 8. The purpose of information output can be achieved by the electrical connection between the differential pressure transmitter 9 and the output module 8.

[0033] The upper end surface of the intake pipe 2 is fixedly connected with a fixing cylinder 11, and a mounting ring 12 is arranged at the upper end of the fixing cylinder 11. A protective net 15 is arranged inside the fixing sleeve of the mounting ring 12. An annular thread groove 14 is provided on the upper end surface of the fixing cylinder 11. A threaded collar 13 is fixedly connected with the lower end surface of the mounting ring 12. The threaded collar 13 is threadedly sleeved in the annular thread groove 14. The threaded sleeve of the threaded collar 13 in the annular thread groove 14 can facilitate the loading and unloading of the mounting ring 12, thereby achieving the purpose of convenient replacement and rapid injection of compressed air, and has better usability and efficiency.

[0034] Working principle: When in use, two precision pressure regulating valves 4 are used to call for consistent pressure, and one pressure is sent to the A pressure measuring port of the differential pressure transmitter 9 as a reference pressure signal. The air path from the other precision pressure regulating valve 4 is connected to the three-way pipe 5, one of which is connected to the B port of the differential pressure transmitter 9, and the other is connected to the level measuring tube 10 with micropores. The level measuring tube 10 is inserted into the liquid level to a certain depth. When the liquid level changes, the pressure of the level measuring tube 10 bubbling to the outside will change accordingly. The differential pressure transmitter 9 reads the pressure difference, outputs a signal, and displays the pressure difference liquid level. The process gas is used for bubbling, which can fully avoid the sticky material blocking the surface of the commonly used liquid level gauge, the sedimentary material burying the liquid level gauge, the surface liquid level fluctuation and other measurement errors. The protective net 15 set on the air inlet pipe 2 can avoid the problem of damage to internal components caused by the intervention of external debris, and has better protection. At the same time, the threaded sleeve of the threaded ring 13 in the annular thread groove 14 can achieve the purpose of convenient loading and unloading of the mounting ring 12, thereby achieving the purpose of convenient replacement and rapid injection of compressed air.

[0035] Finally, it should be noted that the above is only a preferred specific implementation method of the present utility model and is not used to limit the present utility model. Although the present utility model is described in detail with reference to the aforementioned specific implementation methods, for those skilled in the art, they can still modify the technical solutions recorded in the aforementioned specific implementation methods, 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 utility model should be included in the protection scope of the present utility model.

Claims

1. A bubble-type differential pressure liquid level sensor, comprising a sealed housing (1), characterized in that: The upper and lower end surfaces of the sealed housing (1) are respectively fixedly connected with an air intake pipe (2) and a position measuring tube (10); the lower end of the air intake pipe (2) passes through the sealed housing (1) to the inside and is fixedly connected with a connecting pipe (3); the upper inner walls of both sides of the sealed housing (1) are fixedly connected with precision pressure regulating valves (4); the two ends of the connecting pipe (3) are respectively fixedly connected to the two precision pressure regulating valves (4); the lower inner wall of one side of the sealed housing (1) is fixedly connected with a differential pressure transmitter (9); the lower ends of the two precision pressure regulating valves (4) are respectively fixedly connected with a three-way pipe (5) and a matching pipe (6); the lower end of the matching pipe (6) is fixedly connected to the differential pressure transmitter (9); one end of the three-way pipe (5) is fixedly connected to the lower end surface of the differential pressure transmitter (9); the lower end of the three-way pipe (5) is fixedly connected to the position measuring tube (10); and an output module (8) is fixedly arranged inside the sealed housing (1); The upper end surface of the air intake pipe (2) is fixedly connected to a fixing cylinder (11), the upper end of the fixing cylinder (11) is provided with a mounting ring (12), and the internal fixing sleeve of the mounting ring (12) is provided with a protective net (15).

2. The bubbling type differential pressure liquid level sensor according to claim 1, characterized in that: The upper end surface of the fixing cylinder (11) is provided with an annular thread groove (14), and the lower end surface of the mounting ring (12) is fixedly connected with a threaded collar (13), and the threaded collar (13) is threadedly sleeved in the annular thread groove (14).

3. The bubbling pressure differential liquid level sensor according to claim 1, characterized in that: A connecting bracket (7) is fixedly connected to one side of the differential pressure transmitter (9), and the connecting bracket (7) is fixedly connected to the output module (8).

4. The bubbling pressure differential liquid level sensor according to claim 1, characterized in that: The differential pressure transmitter (9) and the output module (8) are electrically connected.

5. The bubbling type differential pressure liquid level sensor according to claim 1, characterized in that: The sealing rings (16) are fixedly connected at the centre of the upper and lower end faces of the sealing housing (1), and the air inlet pipe (2) and the position measuring tube (10) are respectively fixedly sleeved in the corresponding sealing rings (16).

6. The bubbling type differential pressure liquid level sensor according to claim 5, characterized in that: The sealing ring (16) is made of rubber material.

7. The bubbling type differential pressure liquid level sensor according to claim 1, characterized in that: The sealing shell (1) is made of stainless steel.

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