A storage tank liquid level monitoring and sampling device

Abstract

This utility model discloses a tank liquid level monitoring and sampling device, relating to the field of media storage and detection technology. It includes a tank, a liquid level monitoring device, a temperature detection device, and a sampling device. The liquid level monitoring device includes a liquid level float, a liquid level guide rod, and a rangefinder. The liquid level guide rod is located inside the tank, and the liquid level float is sleeved outside the guide rod. A rangefinder is installed on the top of the tank. The temperature device includes a temperature probe and a probe lifting mechanism. The lifting mechanism includes an upper pulley, a lower pulley, a wire rope, and a motor. The motor is connected to the upper pulley, the lower pulley is located at the bottom of the tank, and the wire rope is sleeved around both the upper and lower pulleys. The temperature probe is mounted on the wire rope. The sampling device includes a sampling box and a sampling hose. A sampling bottle is placed inside the sampling box, and a weight sensor is installed in the sampling bottle. The sampling hose and the temperature probe are mounted together on the wire rope, and the sampling hose is connected to the sampling bottle inside the sampling box. This optimizes the sampling and detection method and improves monitoring and sampling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of media monitoring and sampling technology, and in particular to a tank liquid level monitoring and sampling device. Background Technology

[0002] As an indispensable food ingredient in daily life, the quality and safety of cooking oil are directly related to consumers' health.

[0003] Edible oil storage tanks are essential facilities for edible oil processing enterprises to store edible oil. To effectively control the quality of the edible oil within these tanks, real-time monitoring of the oil level and temperature is necessary during routine operations. Furthermore, sampling and testing oil samples from these tanks is crucial for ensuring the safety and quality of edible oil and protecting consumer rights.

[0004] However, the existing methods for monitoring liquid level and temperature are lacking in monitoring accuracy; the existing sampling methods have drawbacks such as low efficiency, high error rate, high failure rate, and poor maintainability.

[0005] Traditional methods of liquid level monitoring include:

[0006] 1. Gauge measurement: This method involves manually measuring the liquid level in a storage tank. This method is outdated and inaccurate, relying heavily on manual operation and susceptible to reading errors and operational mistakes. Measuring tools (such as gauges) have inherent accuracy limitations and are inefficient; frequent entry into the tank area is required, resulting in significant time consumption. It is unsuitable for large-scale or frequent measurements. Safety hazards: Operators must be close to the tank, potentially in a hazardous environment. There are physical risks such as slipping and falling. Environmental impact: Severe weather (such as rain, snow, and strong winds) can affect measurement accuracy. High or low temperatures increase operational difficulty and risk. Inconvenient data management: Manual recording is prone to errors, and data sharing and analysis are difficult in real time. Lack of automation makes integration with modern management systems difficult. High cost: Specialized operator training is required, increasing labor costs. Long-term use leads to high labor and equipment maintenance costs. Limitations: It cannot continuously monitor liquid level changes.

[0007] 2. Radar depth sounding: Radar depth sounding is a widely used tank depth sounding technology in the industry. Compared with manual gauging, radar depth sounding has advantages such as higher accuracy, faster efficiency, higher safety, and more convenient data management.

[0008] Radar depth sounding technology uses a radar level gauge installed on the top of the tank to emit reflected electromagnetic waves towards the liquid surface to measure the liquid level. However, radar waves have relatively long wavelengths and wide beams, resulting in relatively low measurement accuracy, making them unsuitable for some high-precision applications.

[0009] Traditional temperature detection methods include:

[0010] 1. Manual measurement, similar to measuring liquid level with a gauging system; temperature inside the tank is detected by a temperature probe located below the top of the tank. Its disadvantages are the same as those of gauging.

[0011] 2. Fixed thermometers are currently the most common method used in the industry to measure the temperature inside storage tanks. This involves installing multiple temperature sensors at a fixed height within the tank to simultaneously measure the temperature of oil samples at different liquid levels. However, this method has the following drawbacks: Poor accuracy: Because the oil sample level is relatively high, the temperature at a single point cannot represent the overall temperature inside the tank, thus requiring multiple temperature sensing points at different heights; even then, it still cannot accurately reflect the actual temperature. Poor mobility: The height of the measuring points is fixed, making it impossible to measure the temperature at other liquid levels when there is a specific need. High cost: To more accurately measure the temperature at different liquid levels, multiple temperature probes need to be deployed.

[0012] Traditional sampling methods include:

[0013] 1. Tank Top Sampling: Many chemical plants still use the traditional tank top sampling method. This involves personnel climbing to the top of the tank, opening a sampling port, and using a rope to lower the sampling bucket into the tank. This method has several drawbacks, including: high risk (personnel must climb to the top for each sampling, especially in inclement weather like rain or snow, posing a risk of slipping and falling); low efficiency (personnel climbing to the top for each sampling reduces efficiency); poor sampling accuracy (manual bucket sampling results in poor sample positioning and cannot collect sufficiently accurate samples); and poor protection (opening the sampling port for each sampling increases the risk of contamination of the oil sample inside the tank).

[0014] 2. Proportional multi-point sampling is used to replace traditional tank top sampling and achieve precise positioning sampling under the tank. According to standard SH / T 3414-2017, the petrochemical industry currently mostly adopts proportional multi-point sampling under the tank for tank sampling.

[0015] This sampling method consists of two parts: a proportional sampling bracket installed inside the tank and a sampling box installed on the outside of the tank's base. Common proportional sampling brackets include V-shaped and X-shaped brackets. Both utilize the proportional positioning principle of an isosceles triangle to proportionally position the floating liquid level inside the tank. The proportional bracket rises and falls with the liquid level by being dragged by the buoyancy unit on the liquid surface. Generally, the buoyancy unit for a floating roof tank is the floating roof itself, while for domed or fixed-roof tanks, a float or buoy needs to be installed inside the tank as the buoyancy unit. The proportional bracket is connected to the sampling box outside the tank via three flexible metal hoses. The sampling box contains three independent sampling lines, each corresponding to one of the three sampling points on the proportional bracket. Therefore, as the liquid level rises, the proportional bracket can always transfer the sample in the tubes to the sampling box outside the tank proportionally (generally 5 / 6, 1 / 2, and 1 / 6 of the liquid level, but the ratio or number of liquid levels can be adjusted according to actual needs).

[0016] Proportional multi-point sampling is a commonly used sampling method in the industry. However, this method has several drawbacks: large sampling errors, susceptible to material bending and deformation, resulting in significant positioning errors, especially at low liquid levels where accurate positioning is difficult; high failure rate; due to the structural instability of the sampling support, there is a risk of jamming and collapse during daily use; poor error correction; any equipment carries the risk of operational failure, and in principle, failures should be detected promptly. However, due to the special nature of the working environment, when the internal support malfunctions and cannot operate normally, the fault cannot be detected from outside the tank. Even when a fault occurs, the external sampler can still collect samples, but the collected samples are not the required samples, leading to misleading analysis. In the past, internal mechanism failures frequently went unnoticed by staff until maintenance was performed. High maintenance requirements; when the internal mechanism malfunctions, the tank must be stopped and cleaned before repairs can be carried out. Complex installation; the installation of the internal mechanism is relatively complex and cumbersome, and even with clear manufacturer guidance, installation errors are still possible. Utility Model Content

[0017] To address the shortcomings of existing technologies, this utility model provides a tank liquid level monitoring and sampling device, including a tank body, a liquid level monitoring device, a temperature detection device, and a sampling device. The liquid level monitoring device includes a liquid level float, a liquid level guide rod, and a rangefinder. The liquid level guide rod is disposed inside the tank body, with its bottom fixed to the bottom surface of the tank body. The liquid level float is sleeved on the liquid level guide rod and can move up and down along the guide rod. A rangefinder for detecting the position of the liquid level float is disposed on the top of the tank body. The temperature detection device includes a temperature probe and a probe lifting mechanism. The probe lifting mechanism includes an upward sliding mechanism. The system comprises a pulley, a lower pulley, a wire rope, and a motor. The motor output is connected to the upper pulley, the lower pulley is located at the bottom of the tank, and the wire rope is looped around both the upper and lower pulleys. A temperature sensor is mounted on the wire rope. The sampling device includes a sampling box and a sampling hose. A sampling bottle is placed inside the sampling box, and a weight sensor is installed in the sampling bottle. The sampling hose and the temperature sensor are mounted together on the wire rope. The sampling box is located on the outer wall of the tank, and the bottom end of the sampling hose is connected to the sampling bottle inside the sampling box. The liquid level monitoring device, temperature detection device, and sampling device are all connected to the central control system via signal or electrical connection.

[0018] Furthermore, the top of the storage tank is provided with an installation well communicating with the storage tank, a sealing box is provided above the installation well, the upper pulley is provided inside the sealing box, the motor is provided on the side wall of the sealing box, and the output end of the motor passes through the side wall of the sealing box and is connected to the upper pulley.

[0019] Furthermore, a high-level alarm switch is installed on the top surface inside the storage tank. When the liquid level reaches the set maximum position, the liquid level float touches the high-level alarm switch.

[0020] Furthermore, an electrical control box is installed inside the sampling box; one end of the temperature probe cable is electrically connected to the temperature probe, and the other end is electrically connected to the electrical control box.

[0021] Furthermore, the temperature probe cable is wrapped with a protective flexible tube.

[0022] Furthermore, the sampling bottle and the storage tank are connected by a sampling pipeline; both ends of the sampling pipeline are connected to the storage tank, one end of the sampling pipeline is equipped with an inlet valve, and the other end of the sampling pipeline is equipped with a reflux valve, a circulation pump and a check valve arranged near the storage tank; multiple three-way valves are connected on the sampling pipeline between the check valve and the inlet valve, one end of the three-way valve is connected to the sampling pipeline, one end is connected to the sampling bottle and one end is connected to the gas valve.

[0023] Furthermore, the sampling box is connected to the storage tank via a tank root flange.

[0024] Furthermore, the rangefinder is a laser rangefinder, and a reflector is provided on the top of the liquid level float.

[0025] This utility model provides a real-time monitoring system for carbon reduction and emission reduction in electrical equipment manufacturing. Compared with the prior art, it has the following advantages:

[0026] 1. The distance measuring instrument and the liquid level float are used to monitor the liquid level height of the medium in the storage tank. The temperature detection device is used to detect the temperature of the medium in the storage tank. With the probe lifting mechanism, the temperature probe can detect the medium temperature at different positions. At the same time, the probe lifting mechanism can also move the sampling end of the sampling hose to achieve sampling at different positions.

[0027] 2. The sampling pipeline is first completely replaced with the medium in the storage tank by starting the circulation pump, and then the three-way valve is opened to take samples to ensure the accuracy of the sampling.

[0028] 3. The sampling bottle is used with a weight sensor to control the sampling amount, and the sampling is controlled by weight to achieve accurate sampling.

[0029] 4. The central control system enables real-time monitoring and sampling of the internal media of the storage tank, facilitating control and monitoring. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the sampling pipeline in this utility model.

[0032] In the diagram: 1. Tank; 2. Level guide rod; 3. Level float; 4. Rangefinder; 5. High-level alarm switch; 6. Upper pulley; 7. Lower pulley; 8. Motor; 9. Wire rope; 10. Sealed box; 11. Temperature probe; 12. Sampling hose; 13. Temperature probe cable; 14. Sampling box; 15. Installation well; 16. Sampling pipeline; 17. Tank root flange; 18. Inlet valve; 19. Return valve; 20. Circulation pump; 21. Check valve; 22. Three-way valve; 23. Sampling bottle; 24. Gas valve. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1-2This utility model provides a tank liquid level monitoring and sampling device, including a tank body 1, a liquid level monitoring device, a temperature detection device, and a sampling device. The liquid level monitoring device includes a liquid level float 3, a liquid level guide rod 2, and a rangefinder 4. The liquid level guide rod 2 is disposed inside the tank body 1, and its bottom is fixed to the bottom surface of the tank body 1. The liquid level float 3 is sleeved on the liquid level guide rod 2 and can move up and down along the liquid level guide rod 2. A rangefinder 4 for detecting the position of the liquid level float 3 is disposed on the top of the tank body 1. The rangefinder 4 is a laser rangefinder, and a reflector is disposed on the top of the liquid level float 3. The liquid level guide rod 2 is used to restrict the position of the liquid level float 3, preventing the liquid level float 3 from moving to other positions and causing the rangefinder 4 to fail to detect the liquid level float 3, thus preventing inaccurate liquid level data.

[0035] The temperature detection device includes a temperature probe 11 and a probe lifting mechanism. The probe lifting mechanism includes an upper pulley 6, a lower pulley 7, a steel wire rope 9, and a motor 8. An installation well 15 communicating with the storage tank 1 is provided on the top of the storage tank 1. A sealed box 10 is provided above the installation well 15. The upper pulley 6 is located inside the sealed box 10. The motor 8 is located on the side wall of the sealed box 10. The output end of the motor 8 passes through the side wall of the sealed box 10 and is connected to the upper pulley 6. The lower pulley 7 is located at the bottom of the tank body 1. The steel wire rope 9 is sleeved on the upper pulley 6 and the lower pulley 7. The temperature probe 11 is located on the steel wire rope 9. The sampling device includes a sampling box 14 and a sampling hose 12. A sampling bottle 23 is provided inside the sampling box 14. A weight sensor is provided in the sampling bottle 23. The sampling hose 12 and the temperature probe 11 are together mounted on the steel wire rope 9. The sampling box 14 is located on the outer wall of the tank body 1. The bottom end of the sampling hose 12 communicates with the sampling bottle 23 inside the sampling box 14. The sampling box 14 and the tank body 1 are connected through a tank root flange 17. The upper pulley 6 is rotated by the forward and reverse motor 8, which in turn drives the steel wire rope 9 to move. This causes the temperature probe 11 on the steel wire rope 9 and the sampling end of the sampling hose 12 to move up and down together, enabling temperature detection and sampling of the medium at any height inside the storage tank.

[0036] The location monitoring device, temperature detection device, and sampling device are all connected to the central control system via signal or electrical connection. The central control system enables real-time monitoring and control of the internal medium monitoring and sampling operations of the storage tank, facilitating remote operation.

[0037] A high-level alarm switch 5 is installed on the top surface inside the tank 1. When the liquid level reaches the set highest position, the liquid level float 3 touches the high-level alarm switch 5, which triggers the high-level alarm. The high-level alarm switch 5 sends a signal to the central control system for warning.

[0038] The sampling box 14 is equipped with an electrical control box; one end of the temperature probe cable 13 is electrically connected to the temperature probe 11, and the other end is electrically connected to the electrical control box. The temperature probe cable 13 is wrapped with a protective hose.

[0039] The sampling bottle 23 is connected to the storage tank via a sampling pipeline 16. Both ends of the sampling pipeline 16 are connected to the storage tank. One end of the sampling pipeline 16 is equipped with an inlet valve 18, and the other end of the sampling pipeline 16 is equipped with a reflux valve 19, a circulation pump 20, and a one-way valve 21 arranged near the storage tank. Multiple three-way valves 22 are connected to the sampling pipeline 16 between the one-way valve 1 and the inlet valve 18. One end of the three-way valve 22 is connected to the sampling pipeline 16, one end is connected to the sampling bottle 23, and one end is connected to the gas valve 24.

[0040] Sampling is divided into two modes: point sampling and mixed sample collection. The working principle is as follows: In point sampling mode, the system starts motor 8, which lifts the sampling end of the sampling hose 12 to sampling point A. The circulation pump 20, reflux valve 19, check valve 21, and inlet valve 18 are opened. The three-way valve 22 is kept disconnected from the sampling bottle 23, sampling pipeline 16, and gas valve 24. At this time, the medium in the storage tank enters the sampling pipeline 16 through the inlet valve 18 and then enters the storage tank through the reflux valve 19. This cycle continues for a period of time, replacing the residual medium in the sampling pipeline 16 with the latest medium from sampling point A. Then, the three-way valve 22 is controlled to connect the sampling pipeline 16 and the sampling bottle 23, and the check valve 21 and reflux valve 19 are closed, collecting the medium into the sampling bottle 23 at sampling point A. To collect medium from other locations, the sampling location is changed, and the medium from the corresponding location is collected into the corresponding sampling bottle 23.

[0041] When using the mixed sample collection mode, taking three-point mixed sampling as an example, the system controls the sampling end of the sampling hose 12 in the tank to reach the sampling point A, and opens the circulation pump 20, reflux valve 19, check valve 21 and liquid inlet valve 18, so that the three-way valve 22 is controlled to be in the state of disconnection between the sampling bottle 23, the sampling pipeline 16 and the gas valve 24. At this time, the medium in the storage tank enters the sampling pipeline 16 through the liquid inlet valve 18 and then enters the storage tank through the reflux valve 19. After circulating for a period of time, the residual medium in the sampling pipeline 16 is replaced with the latest medium at the sampling point A. The system defaults to a certain sampling bottle 23 as a mixed sample sampling bottle. After the medium replacement is completed, the three-way valve 22 corresponding to the mixed sampling bottle is opened to connect the sampling pipeline 16 with the mixed sampling bottle. At the same time, the one-way valve 21 and the reflux valve 19 are closed. At this time, the medium at point A is sampled into the mixed sampling bottle. When the medium at point A has been sampled to 1 / 3 of the capacity of the mixed sampling bottle, the weight sensor sends a signal to automatically control the three-way valve 22 to disconnect the mixed sampling bottle from the sampling pipeline 16. At this time, the motor 8 starts and moves the sampling end of the sampling hose 12 to the next sampling point B. The above actions are repeated until sampling points A, B and C are all sampled. Finally, the medium in the mixed sampling bottle is the mixed medium of sampling points A, B and C.

[0042] If more sampling points are needed, simply control the sampling amount at each point.

[0043] The above are merely preferred embodiments for use in this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in this field.

Claims

1. A tank liquid level monitoring and sampling device, characterized in that: The system includes a tank, a liquid level monitoring device, a temperature detection device, and a sampling device. The liquid level monitoring device includes a liquid level float, a liquid level guide rod, and a rangefinder. The liquid level guide rod is located inside the tank and its bottom is fixed to the bottom surface of the tank. The liquid level float is sleeved on the liquid level guide rod and can move up and down along it. A rangefinder for detecting the position of the liquid level float is located on the top of the tank. The temperature detection device includes a temperature probe and a probe lifting mechanism. The probe lifting mechanism includes an upper pulley, a lower pulley, a wire rope, and a motor. The motor output is connected to the upper pulley. The lower pulley is located at the bottom of the tank. The wire rope is sleeved on both the upper and lower pulleys, and the temperature probe is mounted on the wire rope. The sampling device includes a sampling box and a sampling hose. A sampling bottle is placed inside the sampling box, and a weight sensor is installed in the sampling bottle. The sampling hose and the temperature probe are mounted together on the wire rope. The sampling box is located on the outer wall of the tank, and the bottom end of the sampling hose is connected to the sampling bottle inside the sampling box.

2. The tank liquid level monitoring and sampling device according to claim 1, characterized in that, The top of the storage tank is provided with an installation well that communicates with the storage tank. A sealed box is provided above the installation well. The upper pulley is located inside the sealed box. The motor is located on the side wall of the sealed box. The output end of the motor passes through the side wall of the sealed box and is connected to the upper pulley.

3. The tank liquid level monitoring and sampling device according to claim 1, characterized in that, A high-level alarm switch is installed on the top surface inside the storage tank. When the liquid level reaches the set maximum position, the liquid level float will contact the high-level alarm switch.

4. The tank liquid level monitoring and sampling device according to claim 1, characterized in that, The sampling box contains an electrical control box; one end of the temperature probe cable is electrically connected to the temperature probe, and the other end is electrically connected to the electrical control box.

5. The tank liquid level monitoring and sampling device according to claim 4, characterized in that, The temperature probe cable is wrapped with a protective flexible tube.

6. The tank liquid level monitoring and sampling device according to claim 1, characterized in that, The sampling bottle and the storage tank are connected by a sampling pipeline; both ends of the sampling pipeline are connected to the storage tank. One end of the sampling pipeline is equipped with an inlet valve, and the other end of the sampling pipeline is equipped with a reflux valve, a circulation pump and a check valve arranged near the storage tank; multiple three-way valves are connected on the sampling pipeline between the check valve and the inlet valve. One end of the three-way valve is connected to the sampling pipeline, one end is connected to the sampling bottle and one end is connected to the gas valve.

7. The tank liquid level monitoring and sampling device according to claim 1, characterized in that, The sampling box is connected to the storage tank via a tank root flange.

8. The tank liquid level monitoring and sampling device according to claim 1, characterized in that: The rangefinder is a laser rangefinder, and a reflector is installed on the top of the liquid level float.

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