Blockage clearing method, system and device for pressure tapping of air flow meter

Abstract

The invention relates to the technical field of prevention and removal of general cleaning or general dirt, in particular to a blockage clearing method for a pressure tap of an air flow meter, which is executed by a processor, connected with an electronic control system and used for executing a control command to be sent; the blowing element is connected with the control element and sends the control command to the control element to execute blowing; the monitoring system is connected with the distributed control system and at least monitors the electronic control system and the control elements; the feedback module is connected with the distributed control system and at least executes feedback of the electronic control system and the control elements. According to the invention, blockages at the pressure tapping of the air flow meter can be cleaned in time.

Description

Technical Field

[0001] This application relates to the field of general cleaning or general dirt removal technology, and in particular to a method for clearing blockages in the pressure tap of an airflow meter, as well as a blockage clearing system and a blockage clearing device. Background Technology

[0002] Airflow meter sensors are primarily used to measure and monitor the flow rate of air or other gases. Airflow meters typically calculate airflow by measuring the pressure difference obtained from pressure taps. If these taps become clogged, the measured pressure values ​​will be distorted, leading to incorrect pressure difference calculations and ultimately a significant deviation between the measured and actual airflow. During production, dust in the air easily accumulates on the pressure taps of airflow meter sensors, clogging the sampling holes and causing inaccurate airflow measurements. Current technology often relies on manual cleaning, but this method is not timely and involves a large workload. Summary of the Invention

[0003] The purpose of this application is to provide a method for clearing blockages in the pressure tap of an air volume flow meter, which solves the technical problem that the prior art cannot provide a method for timely clearing blockages in the pressure tap.

[0004] According to one aspect of this application, a method for clearing blockages at the pressure tap of an airflow meter is provided, the method being executed by a processor, including:

[0005] Connect to the electronic control system and prepare to execute control commands.

[0006] Connect to the control element, send control commands to the control element, and perform purging;

[0007] Connect to the distributed control system to at least perform monitoring of the electronic control system and control components;

[0008] Connect to the distributed control system, at least to implement feedback from the electronic control system and control elements.

[0009] In some embodiments, the process of connecting to the electronic control system and executing control command preparation is as follows: connecting to the electronic control system and executing control command preparation for the control element.

[0010] In some embodiments, the control element is connected, and the control command is sent to the control element to perform the purging process as follows: the electronic control system receives the pressure signal, performs a judgment based on the pressure signal, and when the pressure signal attachment value is less than the target preset value, the purging action is not performed and an alarm signal is released.

[0011] In some embodiments, the process of connecting the distributed control system and at least performing the monitoring of the electronic control system and control elements is as follows:

[0012] Acquire signals from the electronic control system and control components;

[0013] The release signals are monitored, including at least the control element not closing properly signal, low pressure fault signal, control element own signal, and feedback signal.

[0014] In some embodiments, the feedback process of connecting the distributed control system and at least executing the electronic control system and control elements is as follows:

[0015] It is connected to the distributed control system based on the fieldbus protocol to perform feedback on the release signal.

[0016] According to another aspect of this application, a system for clearing blockages at the pressure tap of an airflow meter is provided. The system includes a processor and further comprises:

[0017] The first control module is used to connect to the electronic control system and execute control commands.

[0018] The second control module is used to connect to the control element, send control commands to the control element, and perform purging.

[0019] The monitoring module is used to connect to the distributed control system and at least perform monitoring of the electronic control system and control components.

[0020] The feedback module is used to connect to the distributed control system and at least perform feedback for the electronic control system and control elements.

[0021] In some embodiments, the processor is electrically connected to at least the first control module, the second control module, the monitoring module, and the feedback module.

[0022] According to another aspect of this application, a device for clearing blockages at the pressure tap of an airflow meter is provided, including a pressure guide pipe, a differential pressure transmitter, and an airflow meter, and at least further including: a Y-type tee, a control element, and a pressure transmitter.

[0023] In some embodiments, the control element is at least a normally open solenoid valve and a normally closed solenoid valve.

[0024] Compared with the prior art, this application has the following advantages and beneficial effects: The unblocking method of this application connects an electronic control system, control elements, and a distributed control system. The system controls the pressure tap of the air volume flow meter and performs unblocking measures on it, realizing real-time monitoring, real-time feedback, and timely unblocking of the pressure tap. This effectively distinguishes itself from the prior art, which relies solely on manual unblocking of the pressure tap, resulting in a large workload, untimely cleaning, and severe blockage. It can effectively avoid the accumulation of excessive debris in the pressure tap of the air volume flow meter, realize the immediate cleaning of the pressure tap, and thus greatly improve the accuracy and reliability of the air volume flow meter measurement. Finally, it ensures that the unblocking process is completed in the shortest time, with the fastest processing and the least damage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of the unblocking method provided in this application;

[0027] Figure 2 This is a schematic diagram of the unblocking system provided in this application;

[0028] Figure 3 This is a diagram illustrating the usage scenario of the congestion clearing system provided in this application;

[0029] Figure 4 This is a schematic diagram of the operation principle of the blockage clearing system provided in this application;

[0030] Figure 5 This is another schematic diagram of the operating principle of the blockage clearing system provided in this application;

[0031] Figure 6 This is an installation diagram of the unblocking device provided in this application;

[0032] Figure 7 This is a schematic diagram showing the inspection of the pressure tap of the airflow meter sensor before the unblocking device provided in this application is put into operation;

[0033] Figure 8 This is a schematic diagram showing the inspection of the pressure tap of the airflow meter sensor three months after the unblocking device provided in this application was put into operation;

[0034] Figure 9 A schematic diagram showing the comparison of measurement data before and after the unblocking device provided in this application is put into operation. Detailed Implementation

[0035] The following will refer to the appendices in the embodiments of this application. Figure 1-9 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Unless otherwise defined, all terms used in this specification should have the same meaning as commonly understood by those skilled in the art to which this application pertains.

[0036] Example 1

[0037] Figure 1 This is a flowchart of the unblocking method of this application, which is executed by a processor. The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.; the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0038] The methods include:

[0039] Connect to the electronic control system to execute control commands; connect to the control element to send control commands to the control element and execute purging; connect to the distributed control system to at least perform monitoring of the electronic control system and control element; connect to the distributed control system to at least perform feedback from the electronic control system and control element.

[0040] It is worth noting that this embodiment connects an electronic control system, control components, and a distributed control system. The system controls the pressure tap of the air volume flow meter and performs unblocking measures on it, realizing real-time monitoring and timely unblocking of the pressure tap. This effectively differs from the existing technology, which relies solely on manual unblocking of the pressure tap, resulting in a large workload, untimely cleaning, and severe blockage. It can effectively prevent excessive accumulation of debris in the pressure tap of the air volume flow meter, achieve immediate cleaning of the pressure tap, and thus ensure the accuracy and precision of the air volume flow meter measurement.

[0041] In detail, existing technologies often involve cleaning the pressure tap only after a significant amount of material has accumulated, which severely impacts the measurement accuracy of the airflow meter and creates considerable difficulty. This embodiment employs a purging method to clear blockages at the airflow meter's pressure tap. Connecting to an electronic control system, control commands are pre-set to be sent, ensuring that a clearing command is issued and the clearing action is performed as quickly as possible when foreign objects are detected during real-time monitoring. Then, upon detection of foreign objects, a control command is immediately sent to the control element to execute the purging. This method clears blockages with minimal foreign object mass. Compared to existing technologies that clean when there is a large amount of foreign object, which is not only difficult to clear but also shortens the lifespan of the airflow meter, this embodiment reduces the time and difficulty of each clearing operation, making the clearing process easier. It also minimizes damage to the clearing structure and the airflow meter, effectively extending the lifespan of both the clearing structure and the airflow meter. Finally, the electronic control system and control components are monitored in real time, and real-time feedback is provided to ensure that the unblocking process is completed in the shortest time, fastest, and with the least damage.

[0042] In some possible implementations, the process of connecting to the electronic control system and executing the control command waiting process is as follows: connecting to the electronic control system and executing the control command waiting process on the control element. Specifically, the connected electronic control system can be a PLC, the connected control element can be a solenoid valve, and compressed air is used as the purging source to periodically and programmatically purge the pressure tap of the airflow meter to eliminate blockages, thereby ensuring measurement accuracy and operational reliability. It should also be noted that when the pressure signal is connected to the PLC, if the pressure is below 0.1 MPa, automatic purging will not be initiated, and an alarm signal will be issued; this alarm signal is the waiting command.

[0043] In some possible implementations, the control element is connected, and control commands are sent to the control element to perform the purging process as follows: the electronic control system receives a pressure signal, performs a judgment based on the pressure signal, and if the pressure signal value is less than a target preset value, the purging action is not performed, and an alarm signal is released. It should be noted that the target preset value is preferably 0.1 MPa in this embodiment.

[0044] Based on the foregoing, such as Figure 4 As shown, when purging is started, the positive pressure side solenoid valve V2 and the negative pressure side solenoid valve V3 of the pressure guide pipe are closed, and the positive pressure side solenoid valve V1 and the negative pressure side solenoid valve V4 of the compressed air are opened to introduce compressed air into the positive pressure side pressure guide pipe and the negative pressure side pressure guide pipe of the air volume flow meter for purging.

[0045] After purging is complete, close the compressed air positive pressure side solenoid valve V1 and the compressed air negative pressure side solenoid valve V4, and open the pressure guide tube positive pressure side solenoid valve V2 and the pressure guide tube negative pressure side solenoid valve V3 to end purging and resume normal measurement.

[0046] In some possible implementations, the process of connecting the distributed control system and at least performing the monitoring of the electronic control system and control elements is as follows:

[0047] Acquire signals from the electronic control system and control components;

[0048] The release signals are monitored, including at least the control element not closing properly signal, low pressure fault signal, control element own signal, and feedback signal.

[0049] In detail, the fault signals are set as the solenoid valve not closing tightly and the compressed air pressure being low. The control signal of the solenoid valve and the feedback signal of the compressed air solenoid valve pressure are connected to the DCS system for remote monitoring and control through PROFIBUS-DP communication.

[0050] In some possible implementations, the connection to the distributed control system, at least the feedback process of the electronic control system and control elements, is as follows: the distributed control system is accessed based on the fieldbus protocol, and feedback on the release signal is performed.

[0051] To better understand this application, the blockage removal process is described in detail:

[0052] First, connect to the electronic control system and execute control commands on the control elements. Specifically, the compressed air main pipe pressure signal is connected to the PLC. When the pressure is lower than 0.1MPa, automatic purging is not started, and an alarm signal is issued. This alarm signal is the command to be issued.

[0053] Next, the control element is connected, and control commands are sent to it to execute the purging process. Specifically, the electronic control system receives the pressure signal and makes a judgment based on the pressure signal. If the pressure signal value is less than the target preset value, the purging action is not performed, and an alarm signal is released. The unblocking device is remotely connected to the electronic control system, enabling automatic programmed purging via remote control, or single-step purging on-site. Optionally, the clearing device can be set to perform purging at a time interval of once per hour.

[0054] Specifically, first, close the positive pressure side solenoid valve V2 and the negative pressure side solenoid valve V3, causing the differential pressure transmitter to drop below 0.05 kPa. If the differential pressure transmitter does not reach the 0.05 kPa threshold within 10 seconds, no further action is taken, and an alarm for improper closure of the solenoid valve is issued. Next, open the positive pressure side compressed air purging solenoid valve V1 and the negative pressure side compressed air purging solenoid valve V4. Then, after 30 seconds (this time can be set according to usage), close the positive pressure side compressed air purging solenoid valve V1 and the negative pressure side compressed air purging solenoid valve V4. If the pressure after both the positive and negative pressure side compressed air purging solenoid valves does not reach a threshold of 10 kPa and the pressure difference is less than 1 kPa within 10 seconds, no further action is taken, and an alarm for improper closure of the purging solenoid valve is issued. Subsequently, open the positive pressure side solenoid valve V2 and the negative pressure side solenoid valve V3. Finally, the system resumes normal measurement.

[0055] Next, connect to the distributed control system and at least perform monitoring of the electronic control system and control elements. Specifically, acquire the release signals of the electronic control system and control elements; monitor the release signals, wherein the release signals include at least the solenoid valve not closing properly signal, the compressed air pressure low fault signal, the solenoid valve control signal, and the feedback signal of the compressed air solenoid valve downstream pressure.

[0056] Finally, the distributed control system is connected to perform feedback from at least the electronic control system and control elements. Specifically, the distributed control system is connected via PROFIBUS-DP to perform feedback on the release signal.

[0057] Example 2

[0058] Based on the same inventive concept as the method for clearing blockages at the pressure tap of the airflow meter in Embodiment 1 above, such as Figure 2 As shown, the method in Embodiment 1 is divided into one or more modules. One or more modules are stored in a memory and executed by a processor to complete this application. One or more modules can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program. For example, the computer program can be divided into a first control module, a second control module, a monitoring module, and a feedback module. The specific functions of each module are as follows: the first control module is used to connect to the electronic control system and execute control commands; the second control module is used to connect to the control element, send control commands to the control element, and perform purging; the monitoring module is used to connect to the distributed control system and at least perform monitoring of the electronic control system and the control element; the feedback module is used to connect to the distributed control system and at least perform feedback from the electronic control system and the control element.

[0059] In some possible implementations, the processor is at least electrically connected to the first control module, the second control module, the monitoring module, and the feedback module.

[0060] The specific example of the unblocking method for the pressure tap of the air volume and flow meter in the aforementioned embodiment 1 is also applicable to the unblocking system for the pressure tap of the air volume and flow meter in this embodiment. Through the detailed description of the unblocking method for the pressure tap of the air volume and flow meter, those skilled in the art can clearly understand the unblocking system for the pressure tap of the air volume and flow meter in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0061] Example 3

[0062] Based on the same inventive concept as the unblocking method for the pressure tap of the airflow meter in Embodiment 1 above, this embodiment provides an unblocking device for the pressure tap of an airflow meter, including a pressure guide pipe, a differential pressure transmitter, and an airflow meter, and at least including: a Y-type tee, control elements, and a pressure transmitter. This unblocking device can control a single airflow meter, or control multiple airflow meters individually or simultaneously. It should be noted that the control elements are at least normally open solenoid valves and normally closed solenoid valves. In this embodiment, the number of Y-type tees is preferably set to 2, the number of normally open solenoid valves is preferably set to 2, the number of normally closed solenoid valves is preferably set to 2, and the number of pressure transmitters is preferably set to 2. Furthermore, in some possible embodiments, the unblocking device provided in this embodiment also has 9 AI points, using an internal power supply; and 16 DO points, all connected to a distributed control system.

[0063] Additionally, it should be noted that:

[0064] This application Figure 6 This is a schematic diagram of the installation of the unblocking device;

[0065] Figure 7 The figure shows the inspection of the pressure tapping hole of the airflow meter sensor before the anti-blocking device provided in this embodiment is put into operation. As can be seen from the figure, the pressure tapping hole is almost completely blocked by dust.

[0066] Figure 8 The figure shows the inspection of the pressure tapping hole of the airflow meter sensor after the unblocking device provided in this embodiment has been in operation for 3 months. As can be seen from the figure, the pressure tapping hole is clean.

[0067] Figure 9 This is a schematic diagram comparing measurement data before and after the unblocking device is put into operation, as provided in this embodiment. (Detailed explanation follows.) Figure 9In the common operating condition of the fan operating at a frequency of 29Hz, the air volume values ​​of 200 sets before and after the unblocking device were put into operation were compared. As shown in the figure, the air volume data is accurate and stable after the unblocking device is put into operation. On the other hand, compared with manual cleaning, the unblocking device and unblocking method provided in this embodiment can reduce the workload of unblocking and keep the sensor pressure tapping hole clean. It can be checked regularly every six months or one year, which greatly reduces the labor intensity of personnel.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of this application. It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application.

[0069] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for clearing blockages at the pressure tap of an airflow meter, the method being executed by a processor, characterized in that, include; Connect to the electronic control system and prepare to execute control commands. Connect to the control element, send control commands to the control element, and perform purging; Connect to the distributed control system to at least perform monitoring of the electronic control system and control components; Connect to the distributed control system, at least to implement feedback from the electronic control system and control elements.

2. The method according to claim 1, characterized in that, The process of connecting to the electronic control system and executing control command preparation is as follows: connecting to the electronic control system and executing control command preparation for the control element.

3. The method according to claim 2, characterized in that, The connection control element sends control commands to the control element, and the purging process is as follows: the electronic control system receives the pressure signal, performs a judgment based on the pressure signal, and when the pressure signal attachment value is less than the target preset value, the purging action is not performed and an alarm signal is released.

4. The method according to claim 3, characterized in that, The connected distributed control system at least performs the monitoring process of the electronic control system and control elements as follows: Acquire signals from the electronic control system and control components; The release signals are monitored, including at least the control element not closing properly signal, low pressure fault signal, control element own signal, and feedback signal.

5. The method according to claim 4, characterized in that, The connected distributed control system, at least, performs the feedback process of the electronic control system and control elements as follows: It is connected to the distributed control system based on the fieldbus protocol to perform feedback on the release signal.

6. A system for clearing blockages at the pressure tap of an airflow meter, the system comprising a processor, characterized in that, Also includes: The first control module is used to connect to the electronic control system and execute control commands. The second control module is used to connect to the control element, send control commands to the control element, and perform purging. A monitoring module is used to connect to the distributed control system and at least perform monitoring of the electronic control system and control components; A feedback module is used to connect to the distributed control system and at least perform feedback on the electronic control system and control elements.

7. The system according to claim 6, characterized in that, The processor is electrically connected to at least the first control module, the second control module, the monitoring module, and the feedback module.

8. A device for clearing blockages at the pressure tap of an airflow meter, used in the method of claim 1, comprising a pressure guide pipe, a differential pressure transmitter, and an airflow meter, characterized in that, It also includes at least: Y-type tee, control elements, and pressure transmitter.

9. The apparatus according to claim 8, characterized in that, The control element is at least a normally open solenoid valve and a normally closed solenoid valve.

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