Gas pipe network water seal liquid level detection device

Abstract

A gas pipe network water seal liquid level detection device comprises a shell base, a central hole is formed in the middle of the shell base, a laser ranging module is fixed to the shell base, and the transmitting end and the receiving end of the laser ranging module are downwards exposed out of the shell base from the central hole. A hollow organic glass tube extending downwards is fixed around the central opening, and a floater is placed in the organic glass tube; the system further comprises a protection shell, an STM32 main control module, an NB-IoT module, a circuit board and a lithium battery are further arranged in the protection shell, the STM32 main control module is used for sending a distance measurement instruction to the laser distance measurement module and receiving distance measurement information of the laser distance measurement module, and the STM32 main control module is further used for sending the received distance measurement information to a remote cloud server through the NB-IoT module. The monitoring instrument adopts the laser sensor to detect the liquid level change, and the detection is accurate and rapid. By adopting a floater-assisted laser measurement mode, the problem that a laser sensor cannot effectively detect the water surface is avoided.

Description

Technical Field

[0001] The utility model relates to a liquid level detection device, in particular to a gas pipe network water seal liquid level detection device. Background Art

[0002] There are a large number of gas pipelines in the existing steel industry plant area. On the gas pipeline, there is a gas water seal device at a certain distance. The gas water seal is to make the gas pressure and the height of the water in the water seal reach a pressure balance through a certain water level to remove the condensed water in the gas and maintain the sealing of the gas pipeline. However, because the water seal device of the gas pipeline network is in an open-air environment, the water will slowly evaporate due to weather reasons, causing the liquid level to drop. At this time, it is necessary to manually open the water supply valve to replenish the water level. However, the length of the gas pipeline network in a large steel plant is often tens of kilometers, and there are thousands or even tens of thousands of gas water seal devices. Because the location of the gas water seal is often not powered, there is no way to set up an online instrument to detect the water level. Therefore, the traditional way to check the water level is often to place a floating bamboo pole in the water seal, and then the inspection personnel will regularly inspect the whole plant and observe the height of the bamboo pole to determine whether the water seal device needs to be replenished. This method is inefficient, and often due to reasons such as the bamboo pole getting stuck, the manual judgment of the liquid level is not accurate, which leads to gas leakage due to the low liquid level. Utility Model Content

[0003] In order to solve the above shortcomings, the utility model provides a liquid level detection device, which can effectively solve the above problems. There is no need to manually inspect the gas pipeline network, which effectively replaces manual labor, avoids false alarms, and improves safety.

[0004] Specifically, the utility model adopts the following technical solutions:

[0005] A gas pipe network water seal liquid level detection device comprises an outer shell base, the outer shell base is used to abut against the upper end opening of the gas water seal pipe, the outer shell base is in the shape of a rectangular parallelepiped, its length is greater than the diameter of the gas water seal pipe, and its width is less than the diameter of the gas water seal pipe, a central opening is arranged in the middle of the outer shell base, a laser ranging module is fixed on the outer shell base, and the transmitting and receiving ends of the laser ranging module are exposed downward from the central opening to the outer shell base, and a hollow organic glass tube extending downward is fixed around the central opening below the outer shell base, the organic glass tube extends downward to below the liquid level in the gas water seal pipe, a float is placed in the organic glass tube, and the float can float on the liquid level of the liquid in the organic glass tube; and also comprises a protective outer shell, the protective outer shell is fixed above the outer shell base, and the laser ranging module is sealed as a whole in the protective outer shell. The inside of the protective shell; an STM32 main control module, an NB-IoT module, a circuit board and a lithium battery are also arranged above the shell base and inside the protective shell, and the NB-IoT module is connected to the circuit board through a built-in power strip; the circuit board and the lithium battery are fixed inside the protective shell; the lithium battery connects the positive and negative electrodes of the battery to the power supply terminals of the circuit board through wires; the lithium battery is used to power the main control module, the NB-IoT module, the circuit board and the laser ranging module; the lithium battery, the STM32 main control module and the NB-IoT module are all electrically connected to the circuit board, the STM32 main control module is used to send a ranging instruction to the laser ranging module and receive the ranging information of the laser ranging module, and the STM32 main control module is also used to send the received ranging information to the remote cloud server through the NB-IoT module.

[0006] Furthermore, a float anti-falling latch is installed along the diameter at the bottom of the organic glass tube.

[0007] Furthermore, the transmitting and receiving ends of the laser ranging module are used to emit laser signals downward. After the laser signal is rebounded by the float, it is received by the transmitting and receiving ends of the laser ranging module. The distance from the float to the transmitting and receiving ends of the laser ranging module can be obtained by calculation, and the height value of the liquid level can be further obtained.

[0008] Furthermore, the edge of the laser ranging module and the central opening of the shell base are sealed with a sealing ring and sealing glue; the organic glass tube and the central opening of the shell base are connected and fixed with external waterproof glue.

[0009] Furthermore, two air pressure balance holes are opened in the organic glass tube near the laser ranging module to ensure that the air pressure inside the organic glass tube is consistent with that inside the gas water seal tube, and the water levels inside are equal.

[0010] Furthermore, the float is in the shape of a sealed sphere, the diameter of which is larger than the inner radius of the organic glass tube, and the transmitting and receiving ends of the laser ranging module are located at the center of the circle inside the organic glass tube.

[0011] Furthermore, the float is a sealed hollow hemisphere, the upper surface of the hollow hemisphere is a plane, and a counterweight is arranged at the bottom of the interior of the hollow hemisphere, and the weight of the counterweight can ensure that the sealed hollow hemisphere floats on the liquid surface.

[0012] The whole system includes a packaging shell, an STM32 main control board, a laser sensor module, an NB-IoT module, a battery, a plexiglass tube, a float, etc. The liquid level detection device of the utility model can effectively replace manual inspections, improve labor productivity, and avoid the safety problem of false alarms and gas leaks caused by manual inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a gas pipe network water seal liquid level detection device.

[0014] Figure 2 It is a schematic diagram of a float structure of another embodiment of a gas pipe network water seal liquid level detection device described in the utility model.

[0015] Figure 3 The utility model discloses a flow chart of an operation method of a gas pipe network water seal liquid level detection device. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] like Figure 1As shown, a gas pipe network water seal liquid level detection device of the present invention includes a shell base 7, which is used to abut against the upper end opening of the gas water seal pipe 12. The shell base 7 is in a rectangular shape, and its length is greater than the diameter of the gas water seal pipe 12, and its width is less than the diameter of the gas water seal pipe 12. When placed on the gas water seal pipe 12 (circular pipe), it will not completely cover the upper opening of the gas water seal pipe 12, and the gas seal pipe is connected to the atmosphere. Or the length and width of the shell base are greater than the diameter of the gas water seal pipe, but a vent hole is provided on the shell base to connect to the inside of the gas water seal pipe 12, ensuring that the inside of the gas water seal pipe is connected to the atmosphere. A central opening is provided in the middle of the housing base 7, and the laser ranging module 4 is fixed on the housing base 7 and the transmitting and receiving ends of the laser ranging module 4 are exposed downward from the housing base 7 from the central opening. A hollow organic glass tube 8 extending downward is also fixed around the central opening below the housing base 7, and the organic glass tube 8 extends downward below the liquid level in the gas water seal pipe 12. A float 10 is placed in the organic glass tube 8, and the float 10 can float on the liquid level in the organic glass tube 8. At the bottom of the organic glass tube 8, a through-through float anti-drop pin 11 is installed along the diameter, so that when the liquid level is lower than the length of the organic glass tube 8, the float 10 will not fall out from the inside of the organic glass tube 8; the transmitting and receiving ends of the laser ranging module 4 emit laser signals downward, and the laser signals are rebounded by the float 10 and received by the transmitting and receiving ends of the laser ranging module 4, thereby calculating the distance from the float 10 to the transmitting and receiving ends of the laser ranging module 4, and further obtaining the height value of the liquid level.

[0018] The edge of the laser distance measuring module 4 and the central opening of the housing base 7 are sealed by a sealing ring and sealing glue.

[0019] In one embodiment, the length of the organic glass tube 8 is about 1 meter to 1.5 meters, and is connected and fixed to the central opening of the housing base 7 by outdoor waterproof glue.

[0020] Two air pressure balance holes are opened in the position of the organic glass tube 8 near the laser distance measuring module 4 to ensure that the air pressure inside the organic glass tube 8 is consistent with that inside the gas water seal tube 12, and the water levels inside are equal.

[0021] A float 10 is placed inside the organic glass tube 8 to assist the laser ranging module 4 in detecting the liquid level, thereby avoiding the problem that the laser ranging method cannot detect the water level; the diameter of the float 10 is larger than the internal radius of the organic glass tube 8, and the transmitting end of the laser ranging module 4 is located at the center of the circle inside the organic glass tube, thus ensuring that no matter where the float 10 floats inside the organic glass tube 8, the laser emitted by the laser ranging module 4 can detect the float 10, thereby ensuring the effectiveness of the liquid level detection.

[0022] It also includes a protective shell 1, the waterproof grade of which is IP67. The protective shell is fixed above the shell base 7, and the laser ranging module 4 is sealed inside the protective shell 1 as a whole. An STM32 main control module 3, an NB-IoT module 5, a circuit board 2 and a lithium battery 6 are also arranged above the shell base 7 and inside the protective shell 1. The main control module adopts an STM32 single-chip microcomputer. The NB-IoT module 5 is connected to the circuit board 2 through a built-in power strip; the circuit board 2 is fixed inside the protective shell 1 by screws; the lithium battery 6 is also fixed inside the protective shell 1, and the positive and negative electrodes of the battery are connected to the power supply terminals of the circuit board 2 through wires; the protective shell 1 is connected to the shell base 7 by screws.

[0023] The lithium battery 6 is used to power the main control module 3, the NB-IoT module 5, the circuit board 2 and the laser ranging module 4. The lithium battery 6, the STM32 main control module 3 and the NB-IoT module 5 are all electrically connected to the circuit board 2. The STM32 main control module 3 is used to send a ranging instruction to the laser ranging module 4 and receive ranging information from the laser ranging module 4. The STM32 main control module 3 sends the received ranging information to the remote cloud server through the NB-IoT module 5.

[0024] In one embodiment, the diameter of the float 10 is at least 6 mm smaller than the inner diameter of the organic glass tube 8, ensuring that if small debris is attached to the float 10 during long-term use, the float 10 will not be stuck inside the organic glass tube 8, but will continue to float with the change of the liquid level.

[0025] The laser ranging range of the liquid level detection device is the length of the organic glass tube 8. Through the laser ranging data, the user can calculate the liquid level height inside the gas water seal pipe. The length of the organic glass tube 8 can be customized according to the specific situation of the gas water seal pipe. The commonly used length is 1 meter to 1.5 meters.

[0026] like Figure 2 As shown, another embodiment of the float 10 of the utility model is shown in the figure, the float 10 shown is a sealed hollow hemisphere, the upper surface of the hollow hemisphere is a plane, and a counterweight 101 is arranged at the bottom of the inner part of the hollow hemisphere, and the weight of the counterweight 101 can ensure that the sealed hollow hemisphere floats on the liquid surface, constructing a structure similar to a tumbler to maximize stability. The use of a hemisphere can more accurately measure its plane height, and the laser emitted by the laser ranging module 4 and the laser reflected by the float are more accurate.

[0027] like Figure 3 As shown, the operation method of the liquid level detection device for detecting the water seal liquid level of a gas pipe network of the utility model is as follows:

[0028] Step S1: using the laser distance measurement module 4 to detect the float 10 to obtain distance data.

[0029] Step S2: transmitting the distance data to the STM32 main control module 3. In this step, the distance data is transmitted to the STM32 main control module 3 through the serial port on the power strip on the laser ranging module 4, through the circuit board 2 and the serial port on the power strip on the STM32 main control module 3;

[0030] Step S3: The distance data is processed by the STM32 main control module 3 and sent to the NB-IoT module 5. In this step, the distance data is processed by the STM32 main control module 3 to obtain a processed data packet, which is sent to the NB-IoT module 5 through another serial port on the STM32 main control module 3 plug, the circuit board 2 and the serial port on the NB-IoT module 5 plug.

[0031] Step S4: Use the NB-IoT module 5 to send the data packet to the remote cloud server. In this step, the NB-IoT module 5 processes the data packet with the MQTT protocol, and connects to the operator's (China Mobile / China Telecom / China Unicom) IoT SIM card plugged into the NB-IoT module 5 to send the MQTT data packet to the cloud server on the public network.

[0032] Step S5: Utilize the cloud server to calculate the liquid level in each gas water seal pipe 12 according to the data packet, and display it through the output interface. If the liquid level in a gas water seal pipe 12 is lower than a predetermined value, an alarm is sounded to remind the management personnel to handle it in time.

[0033] In the above step S1, it also includes a timed sleep and wake-up step, and sets the timed sleep and wake-up of the STM32 main control module 3 according to the sending frequency. After the STM32 main control module 3 wakes up, it controls the laser ranging module 4, the NB-IoT module 5, and the circuit board 2 to complete the above steps S1-S4; then the STM32 main control module 3 enters sleep, and controls the laser ranging module 4 and the NB-IoT module 5 to enter sleep at the same time. This cycle repeats. In this way, power can be saved to the maximum extent and long standby time can be achieved.

[0034] In this step, when the liquid level detection device is not working, the STM32 main control module 3 is in a sleep mode. When it is necessary to detect the liquid level and send data, the STM32 main control module 3 is first in an awake state, and the laser ranging module 4 is usually in a sleep state. At this time, it is activated by the awakened STM32 main control module 3, and the laser is emitted to detect the distance. After the detection is completed, it is in a sleep state again; the NB-IoT module 5 is also in a sleep state at ordinary times, and is also activated by the awakened STM32 main control module 3 at this time. The NB-IoT module 5 is connected to the network and sends data. After the data is successfully sent, it is in a sleep state again; finally, the STM32 main control module 3 resumes the sleep mode again.

[0035] The power consumption of the liquid level detection device in sleep mode is less than 35 microamperes. The lithium battery 6 uses a 19000mah lithium battery. When the liquid level detection and data transmission frequency is once per half hour, the battery design service life can reach 3 to 5 years.

[0036] Laser sensors are used to detect changes in liquid levels, which are accurate and fast, avoid false alarms, and promptly remind operators to replenish water to the gas water seal, effectively avoiding gas leaks. The Internet of Things NB-IoT communication module is used to upload detection data to the cloud server, and a large amount of data can be displayed centrally on the software interface, so that all changes in the liquid level of the gas water seal can be grasped in time, replacing the work of manual inspections and greatly improving labor productivity. This liquid level detection device adopts a battery-powered design and achieves low-power operation. According to different data transmission frequencies and battery capacity selections, the battery power can last for 3 to 5 years, solving the problem of no power supply at the gas water seal site. The float-assisted laser measurement method is used to avoid the problem that the laser sensor cannot effectively detect the water surface.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas pipe network water seal liquid level detection device, characterized in that: The utility model comprises a shell base, which is used to abut against the upper opening of the gas water seal pipe. The shell base is in the shape of a rectangular parallelepiped, and its length is greater than the diameter of the gas water seal pipe, and its width is less than the diameter of the gas water seal pipe. A central opening is arranged in the middle of the shell base. The laser ranging module is fixed on the shell base, and the transmitting and receiving ends of the laser ranging module are exposed downward from the shell base through the central opening. A hollow organic glass tube extending downward is fixed around the central opening below the shell base. The organic glass tube extends downward to below the liquid level in the gas water seal pipe. A float is placed in the organic glass tube, and the float can float on the liquid level in the organic glass tube. The utility model also comprises a protective shell, which is fixed above the shell base and seals the laser ranging module as a whole inside the protective shell. An STM32 main control module, an NB-IoT module, a circuit board and a lithium battery are also arranged above the base and inside the protective shell. The NB-IoT module is connected to the circuit board through a built-in power strip; the circuit board and the lithium battery are fixed inside the protective shell; the lithium battery connects the positive and negative electrodes of the battery to the power supply terminals of the circuit board through wires; the lithium battery is used to power the main control module, the NB-IoT module, the circuit board and the laser ranging module; the lithium battery, the STM32 main control module and the NB-IoT module are all electrically connected to the circuit board, the STM32 main control module is used to send a ranging instruction to the laser ranging module and receive the ranging information of the laser ranging module, and the STM32 main control module is also used to send the received ranging information to the remote cloud server through the NB-IoT module.

2. A gas pipe network water seal liquid level detection device according to claim 1, characterized in that: At the bottom of the plexiglass tube, a float anti-fall pin is installed along the diameter.

3. A gas pipe network water seal level detection device according to claim 1, characterized in that: The transmitting and receiving ends of the laser ranging module are used to transmit the laser signal downwards. After the laser signal is rebounded by the float, it is received by the transmitting and receiving ends of the laser ranging module.

4. A gas pipe network water seal liquid level detection device according to claim 3, characterized in that: The edge of the laser ranging module and the central opening of the shell base are sealed with a sealing ring and sealing glue; the organic glass tube and the central opening of the shell base are connected and fixed with external waterproof glue.

5. A gas pipe network water seal level detection device according to claim 1, characterized in that: Two pressure balance holes are opened in the organic glass tube near the laser ranging module to ensure that the air pressure inside the organic glass tube is consistent with that inside the gas water seal tube, and the internal water levels are equal.

6. A gas pipe network water seal liquid level detection device according to claim 1, characterized in that: The float is in the shape of a sealed sphere, and its diameter is larger than the inner radius of the organic glass tube. The transmitting and receiving ends of the laser ranging module are located at the center of the circle inside the organic glass tube.

7. A gas pipe network water seal level detection device according to claim 1, characterized in that: The float is a sealed hollow hemisphere, the upper surface of the hollow hemisphere is a plane, and a counterweight is arranged at the bottom of the interior of the hollow hemisphere, and the weight of the counterweight can ensure that the sealed hollow hemisphere floats on the liquid surface.

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