Liquid level meter for limited space

Abstract

The utility model discloses a liquidometer for limited space, which comprises a floating ball and a base, the top of the floating ball is fixedly connected with a counterweight box I, the counterweight box I is internally provided with a counterweight groove I, the top of the counterweight box I is fixedly connected with a hanging ring, the hanging ring is internally and movably connected with a lobster buckle, and the lobster buckle is fixedly connected with the floating ball. The top of the lobster buckle is in threaded connection with a quick connector, the top of the quick connector is movably connected with a connecting rope, a fixed pulley is arranged at the top of the connecting rope, a transmission pulley is arranged at the end, away from the floating ball, of the fixed pulley, and the connecting rope is movably connected with the fixed pulley and the transmission pulley. The end, away from the floating ball, of the connecting rope is movably connected with a sliding block, and the top of the base is in bolted connection with a positioning plate. The device is simple in structure, convenient to maintain and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of working medium measurement, in particular to a liquid level meter used in a confined space. Background Art

[0002] Confined space refers to the interior of various equipment in factories (furnaces, tower kettles, tanks, warehouses, pools (pickles), tank cars, pipelines, flues, etc.) and closed and semi-closed facilities and places such as tunnels, sewers, ditches, pits, wells, pools, culverts, valve rooms, sewage treatment facilities in cities (including factories) (cabins, underground hidden projects, closed containers, long-term unused facilities or poorly ventilated places, etc.), as well as wells and cellars in rural areas for storing sweet potatoes, potatoes, and various vegetables. Poorly ventilated mines should also be regarded as confined spaces. Equipment, facilities and places with poor ventilation that easily cause the accumulation of toxic and harmful gases and lack of oxygen are called confined spaces.

[0003] In some confined spaces, there will be a certain amount of liquid working fluid stored inside the confined space. The situation of this part of the liquid working fluid is relatively complicated. In the prior art, the measurement effect of the level meter used to measure the liquid level of the working fluid in the confined space is not very good. It is easy to be corroded by the highly corrosive working fluid inside the confined space, or it is restricted by the airtightness of the confined space. The signal transmission effect is not good. As a result, the level meter used in the prior art to measure the liquid level of the working fluid in the confined space is not good, the maintenance cost is high, and it is not suitable for various complex confined spaces.

[0004] To this end, the utility model proposes a liquid level meter for a confined space. Utility Model Content

[0005] The purpose of the utility model is to provide a liquid level meter used in a confined space to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid level meter for confined space, comprising a float and a base, the top of the float is fixedly connected to a counterweight box, a counterweight slot is provided inside the counterweight box, a lifting ring is fixedly connected to the top of the counterweight box, a lobster buckle is movably connected inside the lifting ring, a quick connector is threadedly connected to the top of the lobster buckle, a connecting rope is movably connected to the top of the quick connector, a fixed pulley is arranged on the top of the connecting rope, a transmission pulley is arranged on the end of the fixed pulley away from the float, the connecting rope is movably connected to the fixed pulley and the transmission pulley, and the end of the connecting rope away from the float A slider is movably connected, and a positioning plate is bolted on the top of the base, a guide rail 1 is opened inside the positioning plate, and the slider is clamped in the guide rail 1, and an end of the slider outside the connecting rope is fixedly connected to a connecting rod 1, and an end of the connecting rod 1 outside the connecting rope is fixedly connected to a counterweight box 2, and an end of the counterweight box 2 outside the connecting rod 1 is fixedly connected to a connecting rod 2, and an end of the connecting rod 2 outside the connecting rod 1 is threadedly connected to a magnetic ring, and an end of the base top away from the positioning plate is fixedly connected to a fixing seat, and a sensor is movably connected to the top of the fixing seat, and the magnetic ring is movably connected to the outside of the sensor.

[0007] By adopting the above technical scheme, after the base of the device is fixed outside the confined space, the bottom positions of the fixed pulley and the transmission pulley of the device are aligned with the top of the limit plate at the same horizontal height, the fixed pulley and the transmission pulley are fixed on the wall at this height, and finally the connecting rope is connected, and the float at the bottom of the connecting rope is placed in the confined space, so that the signal transmission sensor of the device does not need to be installed inside the confined space for signal transmission. At the same time, connecting ropes of different lengths can be installed according to needs to adjust the distance between the fixed pulley and the transmission pulley, the positioning plate and the sensor, and the sensor is kept away from the harsh corrosive gas environment in the confined space, so that the service life of the device is extended. The device has a simple structure, convenient maintenance and low cost.

[0008] Preferably, the fixed pulley is externally bolted with fixing bolt one, the transmission pulley is externally bolted with fixing bolt three, the top of the sensor is fixedly connected to a limiting plate, the end of the top of the limiting plate away from the sensor is bolted with fixing bolt two, and the limiting plate is bolted to the positioning plate through fixing bolt two.

[0009] By adopting the above technical solution and setting a limit plate, the measurement zero point of the device can be well determined. At the same time, by setting fixing bolt one, fixing bolt two and fixing bolt three, the device can be well fixed to prevent measurement fluctuations.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: after the base of the device is fixed outside the confined space, the bottom positions of the fixed pulley and the transmission pulley of the device are aligned with the top of the limit plate at the same horizontal height, the fixed pulley and the transmission pulley are fixed on the wall at this height, and finally the connecting rope is connected, and the float at the bottom of the connecting rope is placed in the confined space, so that the sensor for signal transmission of the device does not need to be installed inside the confined space for signal transmission, and at the same time, different lengths of connecting ropes can be installed according to needs to adjust the distance between the fixed pulley and the transmission pulley, the positioning plate and the sensor, and the sensor is kept away from the harsh corrosive gas environment in the confined space, so that the life of the device is longer, and the device has a simple structure, convenient maintenance and low cost. By setting the limit plate, the measurement zero point of the device can be well determined, and by setting fixing bolts one, two and three, the device can be well fixed to prevent measurement fluctuations. It is very practical and worth promoting. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the zero-position front three-dimensional structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the full-position side stereoscopic structure of the utility model;

[0013] Figure 3 It is a zero-position plane schematic diagram of an application example of the utility model;

[0014] Figure 4 It is a full-position plane schematic diagram of an application example of the utility model;

[0015] Figure 5 This is a structural schematic diagram of a counterweight box of the utility model;

[0016] Figure 6 This is a structural schematic diagram of the second counterweight box of the utility model.

[0017] In the figure: 1. Float; 2. Counterweight box 1; 3. Lifting ring; 4. Lobster buckle; 5. Quick connector; 6. Connecting rope; 7. Fixed pulley; 8. Fixing bolt 1; 9. Slider; 10. Positioning plate; 11. Guide rail 1; 12. Counterweight box 2; 13. Connecting rod 1; 14. Connecting rod 2; 15. Magnetic ring; 16. Sensor; 17. Fixed seat; 18. Base; 19. Limiting plate; 20. Fixing bolt 2; 21. Counterweight slot; 22. Guide rail 2; 23. Slide plate; 24. Transmission pulley; 25. Fixing bolt 3. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figures 1 to 6 , the utility model provides a technical solution:

[0020] A liquid level meter for confined space includes a float 1 and a base 18. A counterweight box 2 is fixedly connected to the top of the float 1. The float 1 is made of stainless steel 304 and has a hollow structure inside. The hollow structure can well allow the float 1 to float on the top of the liquid working medium to be measured in the confined space. A counterweight slot 21 is provided inside the counterweight box 12. The counterweight box 12 is used in conjunction with the counterweight box 2 12. When using the device, the counterweight is required. The corresponding counterweight blocks are placed in the counterweight box 12 and the counterweight box 2 12, but the weight should not be too large. The weight of the counterweight box 12 is slightly larger than the weight of the counterweight box 2 12. The connecting rope 6 can be straightened well by counterweight, so that the measurement result is more accurate. If the counterweight is not performed, the connecting rope 6 is easy to loosen, resulting in errors in the measurement result. At the same time, if the friction force of the slider 9 is too large when it moves inside the guide rail 11, when the working fluid in the confined space rises, the slider 9 will not slide down due to the excessive friction force due to the lack of counterweight, resulting in errors in the measurement result. A lifting ring 3 is fixedly connected to the top of the counterweight box 2. The lifting ring 3 is made of 304 stainless steel and has a solid structure. The lifting ring 3 is threadedly connected to the counterweight box 12. The lobster clasp 4 is movably connected inside the hanging ring 3. The lobster clasp 4 is made of stainless steel 304. If the float 1 accidentally falls, the lobster clasp 4 can be pulled out through the connecting rope 6, and then a new float 1 can be installed, which makes the maintenance cost of the device lower and convenient to handle in case of failure. The top of the lobster clasp 4 is threadedly connected with a quick connector 5. The quick connector 5 is a cylindrical structure made of stainless steel 304, and a connecting groove is provided inside. After the connecting rope 6 is inserted into the connecting groove inside the quick connector 5 and the connecting groove is filled with sealant, the connecting rope 6 and the quick connector 5 can be connected and fixed. When the connecting rope 6 needs to be replaced, it is only necessary to cut the connection between the connecting rope 6 and the quick connector 5, and then replace the top of the lobster clasp 4 with a new quick connector 5 and fix the connecting rope 6 to the quick connector 5 to complete the replacement. The top of the quick connector 5 is movably connected with a connecting rope 6. The connecting rope 6 is made of nylon. The use of this material can cope with more complex confined space environments. A fixed pulley 7 is arranged on the top of the connecting rope 6. The fixed pulley 7 is made of hard plastic. The fixed pulley 7 is installed at a position with a better external environment in the confined space by fixing bolts 8. By adjusting the distance between the fixed pulley 7 and the transmission pulley 24, the positioning plate 10 and the sensor 16, the signal sending device and the instrument device of the device can be installed at a distance far from the inside of the confined space. When in use, it should be noted that the center point of the connecting rope 6 pulled out from the top of the fixed pulley is at the same horizontal point as the bottom of the circular ring structure of the limiting plate 19. A transmission pulley 24 is arranged at one end of the fixed pulley 7 away from the floating ball 1. The transmission pulley 24 is made of hard plastic. The transmission pulley 24 can be well used to shape the position of the connecting rope 6 through the transmission pulley 24 near the slider 9. After shaping, the connecting rope 6 near the slider 9 of the transmission pulley 24 is parallel to the connecting rope 6 at the side of the fixed pulley 7 near the floating ball 1, which reduces the measurement error.The connecting rope 6 is movably connected with the fixed pulley 7 and the transmission pulley 24. The end of the connecting rope 6 away from the floating ball 1 is movably connected with a slider 9, which is made of hard plastic. The slider 9 can slide up and down well inside the guide rail 11. The top of the base 18 is bolted with a positioning plate 10, which is vertically installed on the top of the base 18. The positioning plate 10 can well limit the slider 9. At the same time, by limiting the sliding position of the slider 9, the slider 9 can drive the magnetic ring 15 sliding outside the sensor 16 to limit the sliding posture, so as to prevent the magnetic ring 15 from causing errors in the measurement results due to excessive or too small sliding posture. A guide rail 11 is provided inside the positioning plate 10, and the slider 9 is clamped inside the guide rail 11. The end of the slider 9 away from the connecting rope 6 is fixedly connected with a connecting rod 13, and the connecting rod 13 and the connecting rod 2 14 are made of hard plastic. The connecting rod 13 and the connecting rod 2 14 can drive the weight box 2 12 and the magnetic ring 15 to slide through the sliding of the slider 9. The end of the connecting rod 13 away from the connecting rope 6 is fixedly connected to a counterweight box 12, and a counterweight block can be placed inside the counterweight box 12. By placing the counterweight block, the connecting rope 6 can be straightened to make the measurement result more accurate and eliminate the friction between the slider 9 and the guide rail 11. The end of the counterweight box 2 12 away from the connecting rod 1 13 is fixedly connected to the connecting rod 2 14, and the end of the connecting rod 2 14 away from the connecting rod 1 13 is threadedly connected to the magnetic ring 15. The magnetic ring 15 and the sensor 16 are magnetostrictive liquid level gauges. The working principle of this liquid level gauge is based on the magnetostrictive effect and the Wiedemann effect (also known as the magnetostrictive principle). By accurately measuring the time interval between the inquiry pulse and the return pulse, a high-precision and high-repeatability liquid level value can be obtained. This measurement method utilizes the magnetostrictive phenomenon, that is, the change of the magnetization direction in the ferromagnetic material will cause the change of the medium lattice spacing, thereby causing the length and volume of the ferromagnetic material to change. The meter uses the time when the strain pulse signal generated when two different magnetic fields intersect is detected to calculate the exact position of the intersection of the magnetic fields. The end of the top of the base 18 away from the positioning plate 10 is fixedly connected to the fixing seat 17, and the top of the fixing seat 17 is movably connected to the sensor 16. The sensor 16 is threadedly connected to the fixing seat 17, which is convenient for replacing sensors 16 of different ranges. The magnetic ring 15 is movably connected to the outside of the sensor 16. The sensor 16 is a transmitter of a magnetostrictive level gauge (emitting a 4-20mA signal). By connecting the signal emitted by the sensor 16 to a monitoring device that can receive a 4-20mA signal, the liquid level height inside the confined space can be remotely monitored. At the same time, the calibration method of the zero point and the maximum value of the liquid level range of the device can be referred to the instruction manual. Figure 3 And the instruction manual Figure 4After fixing the base 18 of the device outside the confined space, align the bottom positions of the fixed pulley 7 and the transmission pulley 24 of the device with the top of the limit plate 19 at the same horizontal height, fix the fixed pulley 7 and the transmission pulley 24 on the wall at this height, and finally connect the connecting rope 6, and put the floating ball 1 at the bottom of the connecting rope 6 into the confined space, so that the sensor 16 for signal transmission of the device does not need to be installed inside the confined space for signal transmission. At the same time, different lengths of connecting ropes 6 can be installed according to needs to adjust the distance between the fixed pulley 7 and the transmission pulley 24, the positioning plate 10 and the sensor 16, and keep the sensor 16 away from the harsh corrosive gas environment in the confined space, so that the life of the device is longer. The fixed pulley 7 is bolted with a fixing bolt 1 8 on the outside, and the transmission pulley 24 is bolted with a fixing bolt 3 25 on the outside. The top of the sensor 16 is fixedly connected to the limit plate 19, and the end of the top of the limit plate 19 away from the sensor 16 is bolted with a fixing bolt 2 20, and the limit plate 19 is bolted with the positioning plate 10 through the fixing bolt 20. By setting the limit plate 19, the measurement zero point of the device can be well determined. At the same time, by setting the fixing bolt 1 8, the fixing bolt 20 and the fixing bolt 3 25, the device can be well fixed to prevent measurement fluctuations.

[0021] Working principle: When installing this device, first determine the highest liquid level of the liquid working medium that needs to be measured inside the confined space according to the needs, and select a connecting rope 6 of appropriate length according to the highest liquid level. The minimum length of the connecting rope 6 should be greater than 2.5 times the highest liquid level height of the liquid working medium that needs to be measured inside the confined space. Fix the fixed pulley 7 and the transmission pulley 24 on the wall at the top of the float 1, and then adjust the distance between the fixed pulley 7 and the transmission pulley 24, the positioning plate 10, the slider 9, the magnetic ring 15 and the sensor 16 according to the actual situation (the distance should not exceed 10M), and adjust the horizontal position of the connecting rope 6 after fixing the base 18, so that the position of the section of the connecting rope 6 at the bottom of the fixed pulley 7 close to the float 1 is parallel to the section of the connecting rope 6 outside the transmission pulley 24 close to the slider, and the centers of the slider 9 and the magnetic ring 15 are on the same straight line, and the connecting rope 6 as a whole needs to be in a straight state. After the installation is completed, the device needs to be counterweighted, and counterweight blocks of different materials are placed in the counterweight box 1 2 and the counterweight box 2 12, and the weight of the counterweight box 1 2 must be slightly greater than the weight of the counterweight box 2 12 (the weight of the counterweight blocks placed in the counterweight box 1 2 and the counterweight box 2 12 should not be too large). After the counterweight is completed, it can be used. When in use, due to the large buoyancy of the float 1, the float 1 will always float on the surface of the liquid working medium inside the confined space that needs to be measured. When the liquid level changes, the float 1 will rise or fall. When the float 1 rises or falls, the float 1 drives the slider 9 and the magnetic ring 15 to move through the fixed pulley 7, the transmission pulley 24 and the connecting rope 6. The magnetic ring 15 will generate a 4-20mA current signal during the movement of the sensor 16. This signal is connected to a device that can monitor the 4-20mA signal input monitoring, so as to complete the monitoring of the liquid height inside the confined space.

[0022] The method for determining the measurement zero point is to install the device and select the length of the connecting rope 6, then put the float 1 into the bottom of the confined space. At this time, straighten the end of the connecting rope 6 connected to the slider 9. At this time, the slider 9 and the magnetic ring 15 should be at the bottom of the limit plate 19 and fit with the limit plate 19. This is the zero point. If it does not fit the bottom of the limit plate 19, it is necessary to adjust the length of the connecting rope 6 so that the slider 9 and the magnetic ring 15 should be at the bottom of the limit plate 19 and fit with the limit plate 19. At this time, the sensor 16 outputs 4mA current. You can refer to the attached manual Figure 3 Perform zero span calibration.

[0023] The method for determining the full-scale point is to install the device and select the length of the connecting rope 6, slide the slider 9 and the magnetic ring 15 to the bottom of the sensor 16, then put the float 1 into the confined space and straighten the connecting rope 6. At this time, the height between the bottom of the confined space and the bottom of the float 1 is measured, which is the maximum range of the device. At this time, the sensor 16 outputs 20mA current. You can refer to the attached manual for details. Figure 4 Perform full-scale point calibration.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid level meter for a confined space, comprising a float (1) and a base (18), characterized in that: The top of the float (1) is fixedly connected to a counterweight box (2), a counterweight groove (21) is provided inside the counterweight box (2), a lifting ring (3) is fixedly connected to the top of the counterweight box (2), a lobster buckle (4) is movably connected inside the lifting ring (3), a quick connector (5) is threadedly connected to the top of the lobster buckle (4), a connecting rope (6) is movably connected to the top of the quick connector (5), a fixed pulley (7) is provided at the top of the connecting rope (6), a transmission pulley (24) is provided at one end of the fixed pulley (7) away from the float (1), the connecting rope (6) is movably connected to the fixed pulley (7) and the transmission pulley (24), a sliding block (9) is movably connected to one end of the connecting rope (6) away from the float (1), a positioning plate (10) is bolted to the top of the base (18), and the fixed pulley (7) is provided at one end of the fixed pulley (7) away from the float (1). A guide rail (11) is provided inside the positioning plate (10), the slider (9) is clamped inside the guide rail (11), the end of the slider (9) away from the connecting rope (6) is fixedly connected to a connecting rod (13), the end of the connecting rod (13) away from the connecting rope (6) is fixedly connected to a counterweight box (12), the end of the counterweight box (12) away from the connecting rod (13) is fixedly connected to a connecting rod (14), the end of the connecting rod (14) away from the connecting rod (13) is threadedly connected to a magnetic ring (15), the top of the base (18) away from the positioning plate (10) is fixedly connected to a fixing seat (17), the top of the fixing seat (17) is movably connected to a sensor (16), and the magnetic ring (15) is movably connected to the outside of the sensor (16).

2. A liquid level gauge for confined space according to claim 1, characterized in that: The fixed pulley (7) is externally bolted with a fixing bolt 1 (8), the transmission pulley (24) is externally bolted with a fixing bolt 3 (25), the top of the sensor (16) is fixedly connected to a limiting plate (19), the top of the limiting plate (19) is bolted with a fixing bolt 2 (20) at one end away from the sensor (16), and the limiting plate (19) is bolted to the positioning plate (10) via the fixing bolt 2 (20).

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