Magnetic floating ball liquid level transmitter

Abstract

The invention discloses a magnetic floating ball liquid level transmitter, and relates to the technical field of liquid level transmitters. A flange A is hermetically welded at the left end of the liquid level balance pipe, the flange A and a blind plate A are hermetically connected through a sealing gasket and a bolt, a liquid inlet pipe is hermetically welded on the left side of the liquid level balance pipe, the liquid inlet pipe is welded on the upper side of the liquid level balance pipe, the liquid inlet pipe is horizontally arranged after extending leftwards, and the measuring pipe is provided with a gas balance pipe on the upper side of the liquid inlet pipe. The liquid level measuring device has the advantages that the upper portion of the measuring tube is communicated with a container with the measured liquid level through the gas balance tube, the gas pressure on the two sides is the same, the liquid levels on the two sides are in the horizontal state, the liquid on the two sides is separated through the balance piston in the liquid level balance tube, and the height of the magnetic floating ball in the measuring tube is irrelevant to the liquid density of the measured liquid level. Therefore, the problems that the magnetic floating ball floats and sinks and the measurement result is inaccurate due to different liquid densities are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level transmitters, in particular to a magnetic floating ball liquid level transmitter. BACKGROUND

[0002] The magnetic induction liquid level transmitter is a liquid level measuring device based on the principle of magnetic induction, mainly applied to the liquid level monitoring of sewage treatment, buried oil tank and high-rise water tank in the industries of chemical industry, electric power, papermaking, food, environmental protection and urban construction, etc. The current magnetic floating ball liquid level transmitter has the following problems: the weight of the magnetic floating ball is fixed, when measuring liquids with different densities, for example, when measuring water, the permanent magnet steel of the magnetic floating ball is flush with the liquid surface, and when measuring oil, the magnetic floating ball will sink because of the small density of oil, and the permanent magnet steel on the magnetic floating ball is lower than the actual liquid surface, which affects the accuracy of liquid level measurement. SUMMARY

[0003] In order to solve the problem of inaccurate detection of liquid level of the current magnetic float liquid level transmitter, the present application provides a magnetic floating ball liquid level transmitter.

[0004] The technical scheme provided by the present application is: a magnetic floating ball liquid level transmitter, comprising a measuring pipe, the measuring pipe is vertically arranged, the top of the measuring pipe is closed, the lower end of the measuring pipe is sealed and welded with a flange B, the flange B and a blind plate B are sealed and connected through a sealing gasket and bolts, the lower part of the blind plate B is sealed and welded with a vertical pipe, the lower part of the vertical pipe is sealed and welded with a liquid level balance pipe, the liquid level balance pipe is horizontally arranged, the vertical pipe is welded on the right side of the liquid level balance pipe, the right end of the liquid level balance pipe is closed, the left end of the liquid level balance pipe is sealed and welded with a flange A, the flange A and a blind plate A are sealed and connected through a sealing gasket and bolts, a liquid inlet pipe is sealed and welded on the left side of the liquid level balance pipe, the liquid inlet pipe is welded on the upper side of the liquid level balance pipe, the liquid inlet pipe is horizontally arranged after extending to the left side, an air balance pipe is arranged on the upper side of the liquid inlet pipe, the air balance pipe is sealed and welded on the measuring pipe, and the air balance pipe is arranged in parallel with the liquid inlet pipe. A limiting pipe is welded on the inner side of the blind plate A, the limiting pipe extends to the right beyond the position of the liquid inlet pipe, a balance piston is installed in the liquid level balance pipe, and the balance piston is gap-fitted with the liquid level balance pipe through a sealing ring. A magnetic floating ball is installed in the measuring pipe, the magnetic floating ball is a cylindrical hollow cylinder, a ring groove is formed in the middle of the magnetic floating ball, and an annular permanent magnet is embedded in the ring groove, when the magnetic floating ball falls on the blind plate B, the permanent magnet is horizontal with the axis of the liquid inlet pipe. A magnetic coupling column is bonded and tied outside the measuring pipe, the magnetic coupling column is arranged in parallel with the measuring pipe in the length direction, and an integrated transmitter is installed on the upper part of the magnetic coupling column.

[0005] The liquid level balance pipe is connected with two pressure lead pipes on both sides, the two pressure lead pipes are connected with the pressure lead joints of a differential pressure transmitter, and the differential pressure transmitter is connected with a signal line and an integrated transmitter.

[0006] When the magnetic floating ball falls on the blind plate B, the permanent magnet is horizontal to the axis of the liquid inlet pipe, and is replaced by: the upper portion of the blind plate B is bonded with a pressure sensing ring, the upper portion of the pressure sensing ring is provided with a rubber pipe, the magnetic floating ball falls on the rubber pipe, the permanent magnet is horizontal to the axis of the liquid inlet pipe, the pressure sensing ring is connected with a signal line and an integrated transmitter, and the weight of the magnetic floating ball depends on the following conditions: 1. the magnetic floating ball falls on the rubber pipe, 2. the liquid inlet pipe is free of liquid, and 3. a standard liquid is injected into the measuring pipe, when the liquid surface of the standard liquid reaches the position of the permanent magnet, the pressure value sensed by the pressure sensing ring is zero.

[0007] The magnetic floating ball is provided with four inwardly recessed dovetail grooves on the outer circle, the dovetail grooves are parallel to the axis of the magnetic floating ball, the dovetail grooves are uniformly arranged along the circumference of the outer circle of the magnetic floating ball, a rubber strip is bonded in each dovetail groove, the rubber strip is a triangular hollow structure, two corners of the lower portion of the rubber strip extend into the dovetail groove, and an angle steel is bonded on the top corner of the upper portion of the rubber strip, and the outer circle formed by the four angle steels is in sliding fit with the inner diameter of the measuring pipe.

[0008] The top portion of the measuring pipe is connected with a liquid adding valve.

[0009] The balance piston is a hollow structure.

[0010] The liquid inlet pipe, the liquid level balance pipe, the stand pipe and the measuring pipe are in communication with each other, and the gas balance pipe is in communication with the measuring pipe.

[0011] The measuring pipe and the liquid inlet pipe, the gas balance pipe, the liquid level balance pipe, the flange A, the flange B, the blind plate A, the blind plate B, the magnetic floating ball, the stand pipe and the angle steel are all made of 304 material.

[0012] The magnetic floating ball falls on the rubber pipe, the permanent magnet is horizontal to the axis of the liquid inlet pipe, the pressure sensing ring is connected with a signal line and an integrated transmitter, and the weight of the magnetic floating ball depends on the following conditions: 1. the magnetic floating ball falls on the rubber pipe, 2. the liquid inlet pipe is free of liquid, and 3. a standard liquid is injected into the measuring pipe, when the liquid surface of the standard liquid reaches the position of the permanent magnet, the pressure value sensed by the pressure sensing ring is zero. BRIEF DESCRIPTION OF DRAWINGS

[0013] The structure of the application is shown in the attached drawings. Figure 1 The principle of the application is shown in the attached drawings. Figure 2 The principle of the application is shown in the attached drawings.​​Figure 3 This is a schematic diagram of the structure of the float in this invention; Appendix Figure 4 It is attached Figure 3 AA cross-section view; Appendix Figure 5 This is a 3D diagram of the buoy.

[0014] 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

[0015] like Figures 1 to 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. 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. 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. 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.

[0016] The principle of this invention is as follows: Figure 2As shown, the upper part of the measuring tube 1 is communicated with the container of the measured liquid level through the air balance pipe 3, the air pressure on both sides is the same, then the liquid surface on both sides is in a horizontal state, the liquid level balance pipe 7 separates the liquid on both sides through the balance piston 6, the liquid level density in the measuring tube 1 is constant, then the floating height of the magnetic floating ball 4 in the measuring tube 1 is irrelevant to the liquid density of the measured liquid surface, thereby avoiding the problem that the magnetic floating ball 4 floats up and down due to the different liquid densities, and the measurement result is inaccurate.

[0017] The liquid level balance pipe 7 is connected with two pressure lead pipes, the two pressure lead pipes are connected with the pressure lead joints of the differential pressure transmitter 16, the differential pressure transmitter 16 is connected with the signal line of the integrated transmitter 13, since the balance piston 6 is matched with the liquid level balance pipe 7 through the sealing ring, the resistance is inevitably generated, when the measured liquid level rises, the balance piston 6 moves to the right side, at this time, the pressure on the left side of the balance piston 6 is higher than that on the right side, that is, the liquid surface in the measuring tube 1 is lower than the measured liquid surface, and there is an error value, when the measured liquid surface changes sharply, the error value is particularly large, the differential pressure transmitter 16 transmits the pressure difference to the integrated transmitter 13, for example, the pressure difference value is P1, which is converted into the height H1, the pressure value transmitted to the integrated transmitter 13 by the magnetic floating ball 4 is H2, then the integrated transmitter 13 obtains the real liquid surface value = H2+H1 through calculation.

[0018] When the magnetic floating ball 4 falls on the blind plate B10, the permanent magnet steel 5 is horizontal with the axis of the liquid inlet pipe 2, which is replaced by: the upper part of the blind plate B10 is bonded with the pressure sensing ring 15, the upper part of the pressure sensing ring 15 is provided with the rubber pipe 14, the magnetic floating ball 4 falls on the rubber pipe 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 the signal line of the integrated transmitter 13, the weight of the magnetic floating ball 4 depends on the following conditions: 1. the magnetic floating ball 4 falls on the rubber pipe 14, 2. the liquid inlet pipe 2 has no liquid, 3. 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, that is, when the magnetic floating ball liquid level transmitter is factory, the center line of the liquid inlet pipe 2 is calibrated as the zero position of the measurement, without the need for on-site installation to adjust again, the human factors are eliminated, and the accuracy of the measurement result is ensured.

[0019] The magnetic floating ball 4 is provided with four inwardly recessed dovetail grooves 401 on the outer circle, the dovetail grooves 401 are parallel to the axis of the magnetic floating ball 4, the dovetail grooves 401 are uniformly arranged along the outer circle circumference of the magnetic floating ball 4, each dovetail groove 401 is bonded with the adhesive tape 19, the adhesive tape 19 is a triangular hollow structure, the two lower corners of the adhesive tape 19 extend into the dovetail groove 401, and the top corner of the upper part is bonded with the angle steel 20, the outer circle formed by the four angle steels 20 is in sliding fit with the inner diameter of the measuring tube 1, the magnetic floating ball 4 and the measuring tube 1 are in flexible contact through the adhesive tape 19, the angle steel 20 and the inner wall of the measuring tube 1 are in linear contact, the friction between the magnetic floating ball 4 and the measuring tube 1 is reduced, and the magnetic floating ball 4 rises and falls more smoothly.

[0020] The top of the measuring tube 1 has a pipe connected to the liquid valve 18. When the standard liquid evaporates, the liquid level in the measuring tube 1 decreases, the buoyancy of the magnetic floating ball 4 is not enough, the weight of the magnetic floating ball 4 is greater than the buoyancy, the inductive ring 15 senses the pressure, and the integrated transmitter 13 sends an alarm signal. The standard liquid is supplemented through the liquid valve 18 until the pressure value of the inductive ring 15 is zero.

[0021] The balance piston 6 has a hollow structure, which is beneficial to reduce weight, reduce inertial mass, and reduce pressure loss on both sides of the balance piston 6.

[0022] The liquid inlet pipe 2, the liquid level balance pipe 7, the vertical pipe 17 and the measuring tube 1 are all connected to each other, and the gas balance pipe 3 is connected to the measuring tube 1.

[0023] 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 floating ball 4, the vertical pipe 17 and the angle steel 20 are all made of 304 material.

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 a 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 vertical pipe (17) is closed and welded with a liquid level balance pipe (7) at the lower part, 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 a 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 an inlet pipe (2), the inlet pipe (2) is welded on the upper side of the liquid level balance pipe (7), the 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 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 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 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), and an annular permanent magnet steel (5) is embedded in the ring groove (402), when the magnetic floating ball (4) falls on the blind plate B (10), the permanent magnet steel (5) is horizontal with the axis of the inlet pipe (2); The outside of the measuring tube (1) is attached and bound with a magnetic coupling column (12), the magnetic coupling column (12) is arranged in parallel with the measuring tube (1) in the length direction, and an integrated transmitter (13) is mounted on the upper part of the magnetic coupling column (12).

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 pressure lead joints 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: When the magnetic floating ball (4) falls on the blind plate B (10), the permanent magnet steel (5) is horizontal with the axis of the inlet pipe (2), which is replaced by: the upper part of the blind plate B (10) is bonded with a pressure sensing ring (15), the upper part of the pressure sensing ring (15) is provided with a rubber pipe (14), the magnetic floating ball (4) falls on the rubber pipe (14), the permanent magnet steel (5) is horizontal with the axis of the inlet pipe (2), the pressure sensing ring (15) is connected with the integrated transmitter (13) through a signal line, the weight of the magnetic floating ball (4) depends on the following conditions:

1. the magnetic floating ball (4) falls on the rubber pipe (14), 2. the inlet pipe (2) has no liquid, 3. 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.

4. 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).

5. 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).

6. A magnetic float level transmitter in accordance with claim 1 wherein: The balance piston (6) is a hollow structure.

7. A magnetic float level transmitter according to 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).

8. A magnetic float level transmitter in accordance with 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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