Internal magnetic float liquid level gauge

Abstract

The application discloses an inner magnetic float liquid level measuring meter, and belongs to the technical field of liquid level measurement of chemical containers, which comprises a communicating pipe, one end of which is connected with one end of an equalizing pipe, and the lower end of which is detachably connected with a lower connecting pipe, the lower end of the lower connecting pipe is connected with the first end of a three-way pipe, the second end of the three-way pipe is detachably connected with the other end of the equalizing pipe, and the third end is connected with an air inlet pipe; an air outlet pipe is arranged on the side wall of the communicating pipe; an inner guide pipe is arranged in the communicating pipe, a plurality of communicating holes are uniformly arranged on the side wall of the inner guide pipe, and an inner magnetic float is movably arranged in the inner guide pipe; the length of the inner guide pipe is less than that of the communicating pipe; a buffer limiting device is arranged on the upper end of the lower connecting pipe and is located on the inner wall of the communicating pipe and the lower end of the inner magnetic float. The application realizes equal pressure of the inner magnetic float, accurately measures the actual position of the liquid level in the container when unstable, avoids triggering the system interlock, and realizes stable operation of the device.

Description

Technical Field

[0001] This invention belongs to the field of chemical container liquid level measurement technology, specifically relating to an internal magnetic float liquid level measuring instrument. Background Technology

[0002] A plate-tube level gauge is a liquid passage designed based on the principle of communicating vessels. The passage connects to the container being measured via a flange or tapered pipe thread, forming a communicating vessel. The stable liquid level observed through the glass tube is the liquid level in the measured container. The internal float level gauge evolved from the plate-tube level gauge and is designed based on the principles of buoyancy and magnetism. A float installed in the communicating plate-tube is at the same height as the liquid level in the container under the action of buoyancy. The internal float is specially made of stainless steel, and a magnet is placed at the upper end inside the float. The internal float rises and falls with the liquid level, driving an indicator on the outside of the communicating plate-tube to display the liquid level. Because its pressure-bearing components are made of stainless steel, the internal float level gauge reduces the number of sealing surfaces, thus improving reliability and safety.

[0003] Refrigeration refers to the artificial cooling of an object or liquid within a certain time and space, reducing its temperature below the ambient temperature and maintaining that temperature. There are many methods of refrigeration, among which liquid vaporization refrigeration is the most widely used. Propylene refrigeration is one of them, which utilizes the endothermic effect of liquid propylene vaporization to achieve refrigeration.

[0004] When a liquid vaporizes into steam, if the liquid is in a closed container and there are no other gases besides the liquid and its own vapor, then the liquid and steam will reach equilibrium at a certain pressure. This vapor is called saturated steam, and its pressure is called the saturation pressure at that temperature, while the temperature is called the saturation temperature. The saturation pressure increases with increasing temperature. If some of the saturated steam is removed from the container, some more steam must vaporize in the liquid to maintain equilibrium. During vaporization, the liquid absorbs heat, called the latent heat of vaporization. The latent heat of vaporization comes from the object being cooled; it cools the object or maintains it at a low temperature below ambient. To continue this process, steam must be continuously removed from the container, and liquid must be continuously added back in. This requirement can be met by removing the steam, condensing it into liquid, and then returning it to the container. If the steam removed from the container were to condense directly into liquid, the required cooling medium temperature would be lower than the liquid's evaporation temperature. Since we want the condensation process to occur at room temperature, the steam pressure needs to be increased to the saturation pressure at room temperature. In this way, the refrigerant will evaporate at low temperature and low pressure, generating a refrigeration effect, and condense at high temperature and high pressure, releasing heat to the environment or cooling medium. Therefore, the refrigeration cycle consists of four processes: refrigerant vaporization, vapor pressure increase, high-pressure vapor condensation, and high-pressure liquid pressure reduction. The propylene compression refrigeration cycle possesses all four basic processes mentioned above.

[0005] In actual low-temperature methanol washing units, in sulfur-containing methanol-propylene coolers, due to the variability of the medium and the external environment, liquid propylene is very easy to vaporize during the commissioning process. The vaporized propylene directly blows the internal magnetic float of the level gauge, causing the position of the internal magnetic float to fluctuate. The level sensor in the connecting pipe, which is based on the position of the internal magnetic float, transmits incorrect data to the DCS, causing the system to be in an unstable state during shutdown and commissioning.

[0006] Propylene is a colorless, slightly sweet, flammable gas with the molecular formula CH3-CH=CH2, a molecular weight of 42.08, a boiling point of -47.7℃, a melting point of -185.25℃, a density 1.46 times that of air, a critical temperature of 91.8℃, a critical pressure of 4.62 MPa, an explosion limit of 2.0–11% (VOL), and a flash point of -108℃. Therefore, propylene must be stored with extreme care. If a leak occurs, because it is heavier than air, it can accumulate in low-lying areas and ditches. If it encounters a spark during its flow, it can easily explode, causing serious consequences. Summary of the Invention

[0007] This invention provides an internal magnetic float level gauge to solve the problem of stable level measurement in easily vaporized media. This invention is achieved through the following technical solution.

[0008] The purpose of this invention is to provide an internal magnetic float level gauge, comprising:

[0009] A connecting pipe has an upper end connected to one end of a pressure equalizing pipe and a lower end detachably connected to a lower connecting pipe. The lower end of the lower connecting pipe is connected to the first end of a tee pipe. The second end of the tee pipe is detachably connected to the other end of the pressure equalizing pipe, and the third end is connected to an air inlet pipe. An air outlet pipe is provided on the side wall of the connecting pipe.

[0010] An inner conduit is disposed inside the connecting tube. Several connecting holes are evenly distributed on the side wall of the inner conduit. An internal magnetic float is movably disposed inside the inner conduit. The length of the inner conduit is less than the length of the connecting tube.

[0011] A buffer limiting device is disposed at the upper end of the lower connecting pipe, and is located on the inner wall of the connecting pipe and at the lower end of the inner magnetic float.

[0012] Preferably, in the above-mentioned internal magnetic float level gauge, the upper inner wall of the connecting pipe is connected to the upper end of the inner conduit, and a plurality of positioning blocks are evenly distributed between the inside of the connecting pipe and the outer wall of the inner conduit.

[0013] Preferably, in the above-mentioned internal magnetic float level gauge, the side wall of the connecting pipe is further provided with an air guide pipe, one end of which is connected to the air inlet pipe.

[0014] Preferably, in the above-mentioned internal magnetic float level gauge, the side wall of the connecting tube is provided with a window for observing the internal magnetic float, a scale is provided on the side of the window, and a level sensor is also provided on the internal conduit.

[0015] Preferably, in the above-mentioned internal magnetic float level gauge, the lower connecting pipe is a trapezoidal pipe that is wider at the top and narrower at the bottom. The upper end is detachably connected to the lower end of the connecting pipe via a flange, and the lower end is connected to the first end of the tee pipe.

[0016] Preferably, in the above-mentioned internal magnetic float level gauge, the second end of the three-way pipe is detachably connected to the other end of the equalizing pipe through the first flange; the three-way pipe is also provided with a condensate drain pipe, and the condensate drain pipe is provided with a condensate drain valve.

[0017] Preferably, in the above-mentioned internal magnetic float level gauge, both the inlet pipe and the outlet pipe are provided with a first flange.

[0018] Preferably, in the above-mentioned internal magnetic float level gauge, the two ends of the internal magnetic float are hemispherical and the middle is cylindrical, the outer wall of the internal magnetic float is provided with a protective layer, and the range of movement of the internal magnetic float is 0-1600mm.

[0019] Preferably, in the above-mentioned internal magnetic float level gauge, the buffer limiting device includes a positioning ring, a spring, and a tray. The outer wall of the positioning ring is connected to the upper inner wall of the lower connecting pipe. The lower end of the spring is connected to the upper wall of the positioning ring, and the upper end is connected to the lower wall of the tray. The diameter of the tray is smaller than the diameter of the internal conduit.

[0020] Preferably, in the above-mentioned internal magnetic float level gauge, the spring has a shape that is larger at the bottom and smaller at the top, and the diameter of the lower end of the spring is smaller than the diameter of the connecting pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention controls the range of motion of the inner magnetic float by controlling the inner conduit in the level gauge. When the system is unstable, gaseous propylene is introduced evenly to the upper and lower sides of the magnetic float through the pressure equalization pipe to achieve pressure equalization at the upper and lower float ends, thereby stabilizing the inner magnetic float and preventing the liquid level sensor from transmitting incorrect signals to the DCS system, causing malfunctions. At the same time, a buffer limiting device is provided on the inner wall of the connecting pipe and at the lower end of the inner magnetic float to prevent the inner magnetic float from falling and getting stuck in the lower pipe in the case of no liquid or insufficient liquid.

[0023] 2. In this invention, a large amount of propylene vapor is generated instantaneously during the vaporization of liquid propylene. This vapor is introduced into the upper part of the inner magnetic float to achieve pressure equalization between the upper and lower parts of the float. The propylene vapor added after the vaporization of the original liquid propylene in the lower part enters the conduit through the gap between the inner conduit and the outer connecting pipe and then through the connecting hole to form pressure equalization between the inner conduit and the connecting pipe. This makes the level gauge as a whole in a uniform state, accurately measuring the actual position of the liquid level in the container when the device is unstable, avoiding triggering system interlocks, and thus achieving stable operation of the device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an internal magnetic float liquid level measuring instrument according to the present invention;

[0025] Figure 2 This is a schematic diagram of the buffer limiting device of the present invention;

[0026] Figure 3 This is a side view of the buffer limiting device of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Connecting pipe, 2. Connecting pipe, 3. Lower connecting pipe, 4. T-pipe, 5. Inlet pipe, 6. Outlet pipe, 7. Inner conduit, 8. Connecting hole, 9. Buffer limiting device, 91. Positioning ring, 92. Spring, 93. Tray, 10. Inner magnetic float, 11. Positioning block, 12. Air guide pipe, 13. Drain pipe, 14. Drain valve. Detailed Implementation

[0029] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0030] This invention provides an internal magnetic float level gauge, such as... Figure 1-3 As shown, it includes:

[0031] A connecting pipe 1 has one end of a pressure equalizing pipe 2 connected to its upper end and a lower connecting pipe 3 detachably connected to its lower end. The lower end of the lower connecting pipe 3 is connected to the first end of a three-way pipe 4. The second end of the three-way pipe 4 is detachably connected to the other end of the pressure equalizing pipe 2, and the third end is connected to an air inlet pipe 5. An air outlet pipe 6 is provided on the side wall of the connecting pipe 1. An inner guide pipe 7 is located inside the connecting pipe 1. Several connecting holes 8 are evenly distributed on the side wall of the inner guide pipe 7. An inner magnetic float 10 is movably installed inside the inner guide pipe 7. The length of the inner guide pipe 7 is less than the length of the connecting pipe 1. A buffer limiting device 9 is located at the upper end of the lower connecting pipe 3 and at the lower end of the inner wall of the connecting pipe 1 and the inner magnetic float 10.

[0032] like Figure 1As shown, the parameters of the inner magnetic float 10 are determined as follows: In a stable liquid pool, when the buoyant force on an object is greater than its own weight, the object floats. In this invention, the mass of the inner magnetic float 10 is measured in the calibration chamber, and the volume is measured using a measuring cup according to Archimedes' principle. Calculations show that the inner magnetic float 10 in the original tubular design fully meets the requirements for propylene level measurement. The outer diameter of the inner magnetic float 10 is φ53mm, and a protective layer is provided on the outer wall of the inner magnetic float 10. The range of movement of the inner magnetic float 10 is 0-1600mm. The connecting pipe is made of 304 stainless steel DN65-SCH10S (SH / T3405), and the liquid level gauge measurement range is 1. The connecting pipe 1 is 600mm long. One end of the pressure equalization pipe 2 is connected to the upper end of the connecting pipe 1, and the lower end is detachably connected to the lower pipe 3. Preferably, the connecting pipe 1 and the lower pipe 3 are detachably connected by a second flange. The flange is a 2-inch CLASS300-RF (SH / T3406) flange. The internal magnetic float 10, which is movable inside the inner conduit 7, has been tested for lifting and lowering. The external magnetic flap function and position are normal. The inner conduit 7 uses a 304 stainless steel pipe with an outer diameter of φ63mm (wall thickness of 1mm) as the lifting conduit for the inner magnetic float 10. The pressure equalization pipes 2 are all made of DN60-SCH10S (SH / T3405) stainless steel 304 pipe.

[0033] During the vaporization of liquid propylene, a large amount of propylene vapor is generated instantaneously. The propylene vapor passes through the inlet pipe 5. The first end of the tee pipe 4 is connected to the lower connector 3. Preferably, the lower connector is a DN50 pipe, which is a trapezoidal pipe with a wider top and narrower bottom. The upper end is detachably connected to the lower end of the connecting pipe 1 via a second flange. The lower end is connected to the first end of the tee pipe 4. The second end is detachably connected to the equalizing pipe 2. The third end is connected to the inlet pipe 5. The propylene vapor enters the equalizing pipe 2 and the lower connector 3 through the tee pipe 4. The equalizing pipe 2 is also connected to the upper end of the connecting pipe 1, and the lower connector 3 is connected to the lower end of the connecting pipe 1. This allows the propylene vapor to enter the lower and upper ends of the connecting pipe 1 respectively through the lower connector 3 and the equalizing pipe 2, achieving... Propylene vapor forms convection at both ends of the connecting pipe 1. The inner conduit 7 is located inside the connecting pipe 1, thus enabling convection at both ends of the inner conduit 7. The vapor then flows out through the outlet pipe 6 located on the side wall of the connecting pipe 1. Preferably, both the inlet pipe 5 and the outlet pipe 6 have a first flange at their ends. The first flange is 2 inches - CLASS300-RF (SH / T3406). A guide pipe 12 is also located on the side wall of the connecting pipe 1, with one end connected to the inlet pipe 5. This allows for pressure equalization of the upper part of the magnetic float 10 within the inner conduit 7, thereby stabilizing the magnetic float 10 and preventing liquid level induction from causing it to... An incorrect signal is transmitted to the DCS system, causing malfunction. Several connecting holes 8 are evenly distributed on the side wall of the inner conduit 7. The length of the inner conduit 7 is less than the length of the connecting pipe 1. Propylene vapor in the connecting pipe 1 enters the connecting holes 8 through the gap between the inner conduit 7 and the connecting pipe 1. The increased propylene vapor after partial vaporization of liquid propylene in the lower pipe 3 enters the conduit 7 through the connecting holes 8 after passing through the gap between the inner conduit 7 and the connecting pipe 1, thus achieving pressure equalization between the inner conduit 7 and the connecting pipe. Preferably, the upper inner wall of the connecting pipe 1 is connected to the upper end of the inner conduit 7. Several positioning blocks 11 are evenly distributed between the inside of the connecting pipe 1 and the outer wall of the inner conduit 7. All positioning blocks 11 are connected to the inner conduit. 7 is firmly fixed inside the connecting pipe 1, thereby ensuring that the entire level gauge is in a uniform state. When the device is unstable, it accurately measures the actual position of the liquid level in the container, avoiding triggering system interlocks, so as to achieve stable operation of the device. Preferably, the side wall of the connecting pipe 1 is provided with a window for observing the inner magnetic float 3, and a scale is provided on the side of the window for easy external observation of the liquid level. The second end of the three-way pipe 4 is detachably connected to the other end of the equalizing pipe 2 through the first flange. Preferably, the three-way pipe 4 is also provided with a condensate drain pipe 13, and a condensate drain valve 14 is provided on the condensate drain pipe 13. The specific gravity of propylene is greater than that of air. The condensate drain pipe 13 and the condensate drain valve 14 are provided below the three-way pipe 4 in the level gauge for future disassembly and maintenance.

[0034] like Figure 2-3As shown, the buffer limiting device 9 includes a positioning ring 91, a spring 92, and a tray 93. The outer wall of the positioning ring 91 is connected to the upper inner wall of the lower tube 3. The lower end of the spring 92 is connected to the upper wall of the positioning ring 91, and the upper end is connected to the lower wall of the tray 93. The diameter of the tray 93 is smaller than the diameter of the inner tube 7. In the absence of liquid or lack of liquid, the inner magnetic float will fall onto the tray 93. The tray 93 exerts pressure on the spring 92. After being subjected to pressure, the spring 92 is compressed. The positioning ring 91 is fixed to the upper inner wall of the lower tube 3 and exerts a reverse force on the spring 92, so that the spring 92 is balanced by force, thereby keeping the inner magnetic float 10 inside the inner tube 7 and preventing the magnetic float from falling out and getting stuck in the lower tube 3. Preferably, the shape of the spring 92 is larger at the bottom and smaller at the top. The diameter of the lower end of the spring 92 is smaller than the diameter of the connecting pipe 1, so as to prevent the spring from getting stuck in the lower tube 3 when compressed.

[0035] It should be noted that the connection relationships of components not specifically mentioned in this invention are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.

[0036] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

[0037] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A liquid level measuring gauge with an internal magnetic float, characterized in that, include: A connecting pipe (1) has one end of a pressure equalization pipe (2) connected to its upper end and a lower connecting pipe (3) detachably connected to its lower end. The lower end of the lower connecting pipe (3) is connected to the first end of a three-way pipe (4), the second end of the three-way pipe (4) is detachably connected to the other end of the pressure equalization pipe (2), and the third end is connected to an air inlet pipe (5). An air outlet pipe (6) is provided on the side wall of the connecting pipe (1). Propylene vapor passes through the air inlet pipe (5) and enters the lower end and upper end of the connecting pipe (1) respectively through the lower connecting pipe (3) and the pressure equalization pipe (2), so that the propylene vapor forms convection at the upper and lower ends of the connecting pipe (1). An inner conduit (7) is disposed inside the connecting pipe (1) to enable propylene vapor to form convection at both ends of the inner conduit (7); several connecting holes (8) are evenly distributed on the side wall of the inner conduit (7), and an inner magnetic float (10) is movably disposed inside; the length of the inner conduit (7) is less than the length of the connecting pipe (1). A buffer limiting device (9) is provided at the upper end of the lower pipe (3) and at the inner wall of the connecting pipe (1) and the lower end of the inner magnetic float (10). The side wall of the connecting pipe (1) is also provided with an air guide pipe (12), one end of which is connected to the air inlet pipe (5), so that the upper part of the inner magnetic float (10) with the inner guide pipe (7) is equipped with equal pressure between the upper and lower parts of the inner magnetic float (10), thereby stabilizing the inner magnetic float (10).

2. The internal magnetic float level gauge according to claim 1, characterized in that, The upper inner wall of the connecting pipe (1) is connected to the upper end of the inner conduit (7), and a number of positioning blocks (11) are evenly distributed between the inside of the connecting pipe (1) and the outer wall of the inner conduit (7).

3. The internal magnetic float level gauge according to claim 1, characterized in that, The side wall of the connecting pipe (1) is provided with a window for observing the inner magnetic float (3), and a scale is provided on the side of the window. A liquid level sensor is also provided on the inner conduit (7).

4. The internal magnetic float level gauge according to claim 1, characterized in that, The lower connecting pipe (3) is a truncated pipe with a larger upper end and a smaller lower end. The upper end is detachably connected to the lower end of the connecting pipe (1) through a flange, and the lower end is connected to the first end of the tee pipe (4).

5. The internal magnetic float level gauge according to claim 1, characterized in that, The second end of the tee pipe (4) is detachably connected to the other end of the equalizing pipe (2) via the first flange; a condensate drain pipe (13) is also provided on the tee pipe (4), and a condensate drain valve (14) is provided on the condensate drain pipe (13).

6. The internal magnetic float level gauge according to claim 1, characterized in that, Both the inlet pipe (5) and the outlet pipe (6) are provided with a first flange at their ports.

7. The internal magnetic float level gauge according to claim 1, wherein the two ends of the internal magnetic float (10) are hemispherical and the middle is cylindrical, the outer wall of the internal magnetic float (10) is provided with a protective layer, and the range of movement of the internal magnetic float (10) is 0-1600mm.

8. The internal magnetic float level gauge according to claim 1, characterized in that, The buffer limiting device (9) includes a positioning ring (91), a spring (92), and a tray (93). The outer wall of the positioning ring (91) is connected to the upper inner wall of the lower tube (3). The lower end of the spring (92) is connected to the upper wall of the positioning ring (91), and the upper end is connected to the lower wall of the tray (93). The diameter of the tray (93) is smaller than the diameter of the inner tube (7).

9. The internal magnetic float level gauge according to claim 8, characterized in that, The spring (92) is shaped with a larger bottom and a smaller top, and the diameter of the lower end of the spring (92) is smaller than the diameter of the connecting pipe (1).

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