Magnetic float level transmitter

Abstract

The utility model relates to a magnetic float liquid level transmitter relates to liquid level transmitter technical field. Liquid level balance pipe left end sealed welding flange A, flange A and blind plate A are sealed through gasket and bolt sealed connection, liquid level balance pipe left side sealed welding liquid inlet pipe, liquid inlet pipe is welded on liquid level balance pipe upside, liquid inlet pipe extends to left side after horizontal arrangement, and gas balance pipe is established to liquid inlet pipe upside. The utility model has the advantages of: the upper portion of the measuring tube is in communication with the container to be measured through the gas balance pipe, the air pressure on both sides is the same, and the liquid level on both sides is in a horizontal state. The liquid in the liquid level balance pipe is separated by the balance piston, and the height of the magnetic float ball in the measuring tube is independent of the liquid density of the measured liquid level, thereby avoiding the problem of inaccurate measurement results caused by the different densities of the liquid.

Description

Technical Field

[0001] This invention relates to the field of liquid level transmitter technology, and more particularly to a magnetic float liquid level transmitter. Background Technology

[0002] The magnetic induction level transmitter is a level measuring device that works based on the principle of magnetic induction. It is mainly used in sewage treatment, underground oil tanks and high-rise water tanks in industries such as chemical, power, papermaking, food, environmental protection and urban construction. The device adopts a non-contact magnetic coupling system. The magnetic float in the measuring tube drives the indicating system as the liquid level rises and falls, effectively avoiding the risk of media leakage.

[0003] Current magnetic float level transmitters have the following problems: The weight of the magnetic float is fixed. When measuring liquids with different densities, such as water, the permanent magnet of the magnetic float is flush with the liquid surface. However, when measuring oil, because oil has a lower density, the magnetic float will sink, and the permanent magnet on the magnetic float will be lower than the actual liquid surface, affecting the accuracy of the liquid level measurement. Summary of the Invention

[0004] To address the problem of inaccurate liquid level detection in current magnetic float level transmitters, this invention provides a magnetic float level transmitter.

[0005] The technical solution provided by this invention is: a magnetic float level transmitter, including a measuring tube, which is arranged vertically and closed at the top. A flange B is welded to the lower end of the measuring tube, and flange B and blind plate B are sealed and connected by a gasket and bolts. A vertical pipe is welded to the lower part of blind plate B, and a level balancing pipe is welded to the lower part of the vertical pipe. The level balancing pipe is arranged horizontally, and the vertical pipe is welded to the right side of the level balancing pipe. The right end of the level balancing pipe is closed, and flange A is welded to the left end of the level balancing pipe. Flange A and blind plate A are sealed and connected by a gasket and bolts. An inlet pipe is welded to the left side of the level balancing pipe and is welded to the upper side of the level balancing pipe. The inlet pipe extends to the left and is arranged horizontally. An air balance pipe is provided on the upper side of the inlet pipe of the measuring tube. The air balance pipe is welded to the measuring tube and is arranged parallel to the inlet pipe.

[0006] A limit tube is welded to the inside of blind flange A. The limit tube extends to the right beyond the position of the inlet pipe. A balance piston is installed inside the liquid level balance tube. The balance piston is fitted with the liquid level balance tube through a sealing ring.

[0007] A magnetic float is installed inside the measuring tube. The magnetic float is a cylindrical hollow tube with an annular groove in the middle. A ring-shaped permanent magnet is embedded in the groove. When the magnetic float falls on the blind plate B, the permanent magnet is horizontal with the axis of the inlet tube.

[0008] A magnetic coupling column is attached and bound to the outside of the measuring tube. The magnetic coupling column is arranged parallel to the measuring tube in the length direction, and an integrated transmitter is installed on the upper part of the magnetic coupling column.

[0009] The liquid level balancing pipe has pressure taps on both sides. The two pressure taps are connected to the pressure taps of the differential pressure transmitter. The differential pressure transmitter has a signal line connected to the integrated transmitter.

[0010] When the magnetic float lands on blind plate B, and the permanent magnet is horizontal with the axis of the inlet pipe, the following is replaced: a pressure-sensing ring is bonded to the upper part of blind plate B, and a rubber tube is provided on the upper part of the pressure-sensing ring. The magnetic float lands on the rubber tube, and the permanent magnet is horizontal with the axis of the inlet pipe. The pressure-sensing ring is connected to the integrated transmitter by a signal line. The weight of the magnetic float depends on the following conditions: 1. The magnetic float lands on the rubber tube; 2. There is no liquid in the inlet pipe; 3. Standard liquid is injected into the measuring tube, and when the standard liquid level reaches the position of the permanent magnet, the pressure value sensed by the pressure-sensing ring is zero.

[0011] The magnetic float has four inwardly recessed dovetail grooves on its outer circumference. The dovetail grooves are parallel to the axis of the magnetic float and are evenly distributed along the outer circumference of the magnetic float. Each dovetail groove has an adhesive strip bonded to it. The adhesive strip has a triangular hollow structure. The two lower corners of the adhesive strip extend into the dovetail groove, and an angle steel is bonded to the upper apex. The outer circle formed by the four angle steels slides in fit with the inner diameter of the measuring tube.

[0012] The measuring tube has a pipe connected to the liquid filling valve at the top.

[0013] The balance piston has a hollow structure.

[0014] The inlet pipe, liquid level balance pipe, riser pipe, and measuring pipe are all interconnected, and the gas balance pipe is interconnected with the measuring pipe.

[0015] The measuring tube, liquid inlet tube, gas balance tube, liquid level balance tube, flange A, flange B, blind flange A, blind flange B, magnetic float, riser and angle steel are all made of 304 stainless steel.

[0016] The beneficial effects of this invention are as follows: The upper part of the measuring tube is connected to the container of the liquid level being measured through an air balance tube. Since the air pressure on both sides is the same, the liquid levels on both sides are horizontal. The liquid level balance tube separates the liquids on both sides through a balance piston. The liquid level density in the measuring tube remains constant, so the floating height of the magnetic float in the measuring tube is independent of the liquid density of the liquid surface being measured. This avoids the problem of the magnetic float rising and sinking due to different liquid densities, resulting in inaccurate measurement results. The differential pressure transmitter measures the pressure difference on both sides of the balance piston and converts it into the height difference of the liquid level. The integrated transmitter calculates the true liquid level height. At the same time, the zero point of the liquid level measurement can be calibrated at the factory, eliminating the need for on-site adjustment and eliminating measurement errors caused by human factors. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Appendix Figure 2 Schematic diagram;

[0019] Appendix Figure 3 This is a schematic diagram of the structure of the float in this invention;

[0020] Appendix Figure 4 It is attached Figure 3 AA cross-section view;

[0021] Appendix Figure 5 This is a 3D diagram of the buoy.

[0022] In the diagram, 1-measuring tube, 2-liquid inlet pipe, 3-gas balance pipe, 4-magnetic float, 401-dovetail groove, 402-ring groove, 5-permanent magnet, 6-balance piston, 7-liquid level balance pipe, 8-blind flange A, 801-limiting pipe, 9-flange A, 10-blind flange B, 11-flange B, 12-magnetic coupling column, 13-integrated transmitter, 14-rubber hose, 15-pressure sensing ring, 16-differential pressure transmitter, 17-riseen pipe, 18-liquid filling valve, 19-rubber strip, 20-angle steel. Detailed Implementation

[0023] like Figures 1-5 As shown, a magnetic float level transmitter includes a measuring tube 1, which is vertically arranged and closed at the top. A flange B11 is welded to the lower end of the measuring tube 1. The flange B11 and a blind plate B10 are sealed and connected by a gasket and bolts. A riser 17 is welded to the lower part of the blind plate B10. A level balancing pipe 7 is welded to the lower part of the riser 17. The level balancing pipe 7 is horizontally arranged. The riser 17 is welded to the right side of the level balancing pipe 7. The right end of the level balancing pipe 7 is closed. A flange A9 is welded to the left end of the level balancing pipe 7. The flange A9 and a blind plate A8 are sealed and connected by a gasket and bolts. An inlet pipe 2 is welded to the left side of the level balancing pipe 7. The inlet pipe 2 is welded to the upper side of the level balancing pipe 7 and extends to the left side before being arranged horizontally. An air balance pipe 3 is provided on the upper side of the inlet pipe 2 of the measuring tube 1. The air balance pipe 3 is welded to the measuring tube 1 and is arranged parallel to the inlet pipe 2.

[0024] A limit tube 801 is welded to the inside of the blind flange A8. The limit tube 801 extends to the right beyond the position of the liquid inlet pipe 2. A balance piston 6 is installed inside the liquid level balance pipe 7. The balance piston 6 is fitted with the liquid level balance pipe 7 through a sealing ring.

[0025] A magnetic float 4 is installed inside the measuring tube 1. The magnetic float 4 is a cylindrical hollow tube with an annular groove 402 in the middle. An annular permanent magnet 5 is embedded in the annular groove 402. When the magnetic float 4 falls on the blind plate B10, the permanent magnet 5 is horizontal with the axis of the liquid inlet tube 2.

[0026] A magnetic coupling column 12 is attached and bound to the outside of the measuring tube 1. The magnetic coupling column 12 is arranged parallel to the measuring tube 1 in the length direction. An integrated transmitter 13 is installed on the upper part of the magnetic coupling column 12.

[0027] The principle of this invention is as follows: Figure 2 As shown, the upper part of the measuring tube 1 is connected to the container of the liquid being measured through the air balance tube 3. Since the air pressure on both sides is the same, the liquid levels on both sides are horizontal. The liquid level balance tube 7 separates the liquids on both sides through the balance piston 6. The liquid level density in the measuring tube 1 is constant. Therefore, the floating height of the magnetic float 4 in the measuring tube 1 is independent of the liquid density of the liquid being measured, thus avoiding the problem of the magnetic float 4 floating or sinking due to different liquid densities, resulting in inaccurate measurement results.

[0028] The liquid level balancing pipe 7 has pressure taps on both sides. The two pressure taps are connected to the pressure taps of the differential pressure transmitter 16. The differential pressure transmitter 16 has a signal line connected to the integrated transmitter 13. Since the balance piston 6 is fitted with the liquid level balancing pipe 7 through a sealing ring, resistance will inevitably be generated. When the measured liquid level rises, the balance piston 6 moves to the right. At this time, the pressure on the left side of the balance piston 6 is higher than the pressure on the right side, which means that the liquid level in the measuring pipe 1 is lower than the measured liquid level, resulting in an error value. When the measured liquid level changes drastically, this error value is particularly large. The differential pressure transmitter 16 transmits this pressure difference to the integrated transmitter 13. For example, if the pressure difference value is P1, which is converted to height H1, and the pressure value transmitted from the magnetic float 4 to the integrated transmitter 13 is H2, then the integrated transmitter 13 calculates the true liquid level value = H2 + H1.

[0029] When the magnetic float 4 lands on the blind flange B10, and the permanent magnet 5 is horizontal with the axis of the inlet pipe 2, the following replacement is made: a pressure-sensing ring 15 is bonded to the upper part of the blind flange B10, and a rubber tube 14 is provided on the upper part of the pressure-sensing ring 15. The magnetic float 4 lands on the rubber tube 14, and the permanent magnet 5 is horizontal with the axis of the inlet pipe 2. The pressure-sensing ring 15 is connected to the integrated transmitter 13 by a signal line. The weight of the magnetic float 4 depends on the following conditions: 1. The magnetic float 4 lands on the rubber tube 14; 2. There is no liquid in the inlet pipe 2; 3. Standard liquid is injected into the measuring tube 1. When the standard liquid level reaches the position of the permanent magnet 5, the pressure value sensed by the pressure-sensing ring 15 is zero. That is, when the magnetic float level transmitter leaves the factory, the center line of the inlet pipe 2 is calibrated as the zero position of the measurement. No readjustment is required during on-site installation, eliminating human factors and ensuring the accuracy of the measurement results.

[0030] The magnetic float 4 has four inwardly recessed dovetail grooves 401 on its outer circumference. The dovetail grooves 401 are parallel to the axis of the magnetic float 4 and are evenly arranged along the circumference of the outer circumference of the magnetic float 4. Each dovetail groove 401 has an adhesive strip 19 bonded inside it. The adhesive strip 19 has a triangular hollow structure. The two lower corners of the adhesive strip 19 extend into the dovetail groove 401, and an angle steel 20 is bonded to the upper apex. The outer circle formed by the four angle steels 20 slides in fit with the inner diameter of the measuring tube 1. The magnetic float 4 and the measuring tube 1 are in flexible contact through the adhesive strips 19, and the angle steels 20 are in line contact with the inner wall of the measuring tube 1, which reduces the friction between the magnetic float 4 and the measuring tube 1, making the magnetic float 4 rise and fall more smoothly.

[0031] The top of the measuring tube 1 is connected to the liquid filling valve 18. When the standard liquid evaporates, the liquid level of the standard liquid in the measuring tube 1 drops, and the buoyancy of the magnetic float 4 is insufficient. When the weight of the magnetic float 4 is greater than the buoyancy, the sensing ring 15 senses the pressure, and the integrated transmitter 13 sends an alarm signal to replenish the standard liquid through the liquid filling valve 18 until the pressure value of the sensing ring 15 is zero.

[0032] The balance piston 6 has a hollow structure, which helps to reduce weight, reduce inertial mass, and reduce pressure loss on both sides of the balance piston 6.

[0033] The inlet pipe 2, liquid level balance pipe 7, riser pipe 17 and measuring pipe 1 are all interconnected, and the gas balance pipe 3 is interconnected with the measuring pipe 1.

[0034] Measuring tube 1, liquid inlet tube 2, gas balance tube 3, liquid level balance tube 7, flange A9, flange B11, blind flange A8, blind flange B10, magnetic float 4, riser 17 and angle steel 20 are all made of 304 stainless steel.

Claims

1. A magnetic float level transmitter comprising a measuring tube (1), characterized in that: The measuring tube (1) is vertically arranged, the top of the measuring tube (1) is closed, the lower end of the measuring tube (1) is closed and welded with a flange B (11), the flange B (11) and the blind plate B (10) are connected by a sealing gasket and bolts, the lower part of the blind plate B (10) is closed and welded with a vertical pipe (17), the lower part of the vertical pipe (17) is closed and welded with a liquid level balance pipe (7), the liquid level balance pipe (7) is horizontally arranged, the vertical pipe (17) is welded on the right side of the liquid level balance pipe (7), the right end of the liquid level balance pipe (7) is closed, the left end of the liquid level balance pipe (7) is closed and welded with a flange A (9), the flange A (9) and the blind plate A (8) are connected by a sealing gasket and bolts, the left side of the liquid level balance pipe (7) is closed and welded with a liquid inlet pipe (2), the liquid inlet pipe (2) is welded on the upper side of the liquid level balance pipe (7), the liquid inlet pipe (2) is horizontally arranged after extending to the left side, the measuring tube (1) is provided with an air balance pipe (3) on the upper side of the liquid inlet pipe (2), the air balance pipe (3) is closed and welded on the measuring tube (1), and the air balance pipe (3) is arranged in parallel with the liquid inlet pipe (2); The inside of the blind plate A (8) is welded with a limiting pipe (801), the limiting pipe (801) extends to the right beyond the position of the liquid inlet pipe (2), the liquid level balance pipe (7) is provided with a balance piston (6), and the balance piston (6) is matched with the liquid level balance pipe (7) through a sealing ring; The measuring tube (1) is provided with a magnetic floating ball (4), the magnetic floating ball (4) is a cylindrical hollow cylinder, a ring groove (402) is formed in the middle of the magnetic floating ball (4), an annular permanent magnet steel (5) is inlaid in the ring groove (402), a pressure sensing ring (15) is bonded on the upper part of the blind plate B (10), a rubber tube (14) is arranged on the upper part of the pressure sensing ring (15), the magnetic floating ball (4) falls on the rubber tube (14), the permanent magnet steel (5) is horizontal with the axis of the liquid inlet pipe (2), the pressure sensing ring (15) is connected with an integrated transmitter (13) through a signal line, and the weight of the magnetic floating ball (4) depends on the following conditions: (A). The magnetic floating ball (4) falls on the rubber tube (14), (B). The liquid inlet pipe (2) has no liquid, (C). The standard liquid is injected into the measuring tube (1), when the liquid surface of the standard liquid reaches the position of the permanent magnet steel (5), the pressure value sensed by the pressure sensing ring (15) is zero; The outside of the measuring tube (1) is attached to a magnetic coupling column (12), the magnetic coupling column (12) is arranged in parallel with the measuring tube (1) in the length direction, and the upper part of the magnetic coupling column (12) is provided with an integrated transmitter (13).

2. A magnetic float level transmitter according to claim 1, characterized in that: The liquid level balance pipe (7) is connected with two pressure lead pipes on both sides, the two pressure lead pipes are connected with the pressure lead connectors of a differential pressure transmitter (16), and the differential pressure transmitter (16) is connected with the integrated transmitter (13) through a signal line.

3. A magnetic float level transmitter according to claim 1, wherein: The magnetic float ball (4) has four inwardly recessed dovetail grooves (401) on the outer circle, the dovetail grooves (401) are parallel to the axis of the magnetic float ball (4), the dovetail grooves (401) are evenly arranged along the circumference of the outer circle of the magnetic float ball (4), a rubber strip (19) is bonded in each dovetail groove (401), the rubber strip (19) is a triangular hollow structure, two lower corners of the rubber strip (19) extend into the dovetail groove (401), and an angle steel (20) is bonded to the upper top corner of the rubber strip (19), and the outer circle formed by the four angle steels (20) is in sliding fit with the inner diameter of the measuring tube (1).

4. A magnetic float level transmitter according to claim 1 wherein: The top of the measuring tube (1) is provided with a pipeline connected liquid feeding valve (18).

5. A magnetic float level transmitter according to claim 1 wherein: The balance piston (6) is a hollow structure.

6. A magnetic float level transmitter in accordance with claim 1 wherein: The liquid inlet pipe (2), the liquid level balance pipe (7), the stand pipe (17) and the measuring tube (1) are in communication with each other, and the gas balance pipe (3) is in communication with the measuring tube (1).

7. A magnetic float level transmitter according to claim 1 wherein: The measuring tube (1), the liquid inlet pipe (2), the gas balance pipe (3), the liquid level balance pipe (7), the flange A (9), the flange B (11), the blind plate A (8), the blind plate B (10), the magnetic float ball (4), the stand pipe (17) and the angle steel (20) are all made of 304 material.

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