Dust blocking prevention differential pressure flowmeter based on electrostatic dust collection
By installing an electrostatic field generator in the flow meter's delivery channel, the dust particles are deflected by charging, which solves the dust blockage problem, ensures the long-term stability and measurement accuracy of the flow meter, and reduces maintenance needs and costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN HESANLI TECH ENG CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-19
AI Technical Summary
Existing differential pressure flow meters are prone to clogging due to dust in dusty gas measurement scenarios, which can lead to decreased measurement accuracy and equipment failure. Traditional anti-clogging methods increase maintenance costs or affect measurement continuity.
An electrostatic field generator is installed in the conveying channel of the flow meter. The electrostatic field is used to charge and deflect the dust, avoiding the pressure tapping area. A high-voltage electrode and a dust collecting electrode are used to form an electric field to capture the dust and prevent blockage.
It achieves dust-proof and anti-clogging function without frequent maintenance, ensures the continuity and measurement accuracy of differential pressure signals, reduces operation and maintenance costs, and extends equipment life.
Smart Images
Figure CN224262570U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flow measurement technology, and in particular to a differential pressure flow meter based on electrostatic dust removal that prevents dust blockage. Background Technology
[0002] Differential pressure flow meters are flow measurement devices based on Bernoulli's principle. They calculate flow rate by detecting the pressure difference between upstream and downstream components when fluid flows through a throttling element (such as an orifice plate or venturi tube). This technology is widely used in industrial gas flow monitoring, flue gas emission metering, and chemical process control due to its simple structure, high reliability, and wide adaptability. However, in dusty gas measurement scenarios, such as coal-fired boiler flues and cement plant exhaust pipes, suspended dust particles in the gas easily accumulate in the pressure taps and connecting pipes, gradually causing blockages. This leads to pressure signal distortion, decreased measurement accuracy, and in severe cases, even complete instrument failure.
[0003] Existing solutions to dust clogging problems can be broadly categorized into two types: The first involves installing mechanical filters, such as metal mesh or porous ceramic filters, at the pressure taps to physically block dust from entering the pressure lines. However, this method has inherent drawbacks: as dust accumulates on the filter media surface, the pores gradually become clogged, increasing system pressure loss, affecting flow rate calculation accuracy, and requiring frequent shutdowns for cleaning or filter replacement, significantly increasing maintenance costs. The second solution involves installing a backflushing system in the pressure lines, using periodic high-pressure gas to flush away accumulated dust from the pressure taps. However, backflushing systems require additional air sources, valves, and control units, increasing equipment complexity and manufacturing costs; furthermore, pressure fluctuations during backflushing may introduce interference, affecting the continuity of real-time measurements. Utility Model Content
[0004] The purpose of this invention is to provide a differential pressure flow meter based on electrostatic dust removal that prevents dust from clogging, effectively preventing dust from accumulating in the pressure tapping area without affecting measurement accuracy or requiring frequent maintenance.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a differential pressure flow meter based on electrostatic dust removal to prevent dust blockage, comprising a flow meter body, an upstream pressure tap, and a downstream pressure tap for installation in a conveying channel, wherein a differential pressure sensor is connected to the upstream and downstream pressure taps, and an electrostatic field generating device is installed in the conveying channel, the electrostatic field generating device being located upstream of the upstream pressure tap, for generating an electrostatic field in the airflow to charge and deflect the dust to avoid the pressure tap area.
[0006] Preferably, the electrostatic field generating device includes a high-voltage electrode and a dust collecting electrode disposed in the conveying channel, and the high-voltage electrode and the dust collecting electrode are connected to an electrostatic field generator so that an electric field is formed between the high-voltage electrode and the dust collecting electrode.
[0007] More preferably, the high-voltage electrode is located at the top or center of the conveying channel, and the dust collecting electrode is located at the bottom or side wall of the conveying channel.
[0008] More preferably, the electrostatic field generator is used to provide a voltage of 5-20kV to the high-voltage electrode.
[0009] More preferably, the openings of both the upstream pressure tapping hole and the downstream pressure tapping hole are flared structures in the shape of a trumpet.
[0010] More preferably, a dust collection trough is detachably installed at the bottom of the conveying channel located downstream of and near the dust collection electrode, and the dust collection trough is connected to the conveying channel.
[0011] More preferably, the conveying channel is a horizontally arranged cylindrical pipe.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] 1. By setting an electrostatic field generator upstream of the pressure tap, the dust in the airflow is charged by the electrostatic field and deflected by the electric field force, which fundamentally prevents dust from entering the pressure tap area. This solves the problem of pressure tap blockage caused by dust accumulation in traditional differential pressure flowmeters, and ensures the continuity and accuracy of the differential pressure signal between the upstream and downstream pressure taps, thereby improving the flow measurement accuracy and long-term stability.
[0014] 2. Compared with traditional mechanical cleaning (such as backflushing and vibration cleaning), electrostatic field anti-clogging is a fully automatic process that does not require downtime for cleaning or frequent maintenance, reducing operation and maintenance costs and extending equipment life. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure in the embodiment;
[0016] Figure 2 This is a partial side view of the structure in the embodiment;
[0017] Figure 3 This is a schematic diagram of the structure when the dust is deflected under force in the embodiment;
[0018] Figure 4 This is a partial side view of the structure when the dust is deflected under force in the embodiment.
[0019] In the picture:
[0020] 1—Flowmeter body; 2—Upstream pressure tap; 3—Downstream pressure tap
[0021] 4 – Differential pressure sensor; 5 – Electrostatic field generator; 6 – High voltage electrode
[0022] 7—Dust collection pole; 8—Conveying channel; 9—Dust collection tank. Detailed Implementation
[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.
[0024] It should be noted in advance that, in this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.
[0025] like Figures 1 to 4 As shown, the anti-dust clogging differential pressure flow meter based on electrostatic dust removal includes a flow meter body 1, an upstream pressure tap 2, and a downstream pressure tap 3, which are installed in the conveying channel 8. The upstream pressure tap 2 and the downstream pressure tap 3 are connected to a differential pressure sensor 4. An electrostatic field generator is installed in the conveying channel 8. The electrostatic field generator is located upstream of the upstream pressure tap 2 and is used to generate an electrostatic field in the airflow to charge the dust and deflect it to avoid the pressure tap area.
[0026] In the above structure, the electrostatic field generating device includes a high-voltage electrode 6 and a dust collecting electrode 7 located in the conveying channel 8. The high-voltage electrode 6 and the dust collecting electrode 7 are connected to an electrostatic field generator 5 so that an electric field is formed between the high-voltage electrode 6 and the dust collecting electrode 7. This allows the flowing dust particles to become charged and be actively adsorbed and captured by the dust collecting electrode 7, thus blocking the spread of dust to the pressure tapping area from the source. At the same time, the electrode layout is highly compatible with the channel structure, which not only achieves low-resistance continuous dust removal, but also avoids interference with airflow velocity and differential pressure measurement. Ultimately, it ensures long-term unobstructed access to the pressure tapping hole and stability of the differential pressure signal without the need for external dust removal intervention.
[0027] Furthermore, the high-voltage electrode 6 is located at the top or center of the conveying channel 8, and the dust collecting electrode 7 is located at the bottom or side wall of the conveying channel 8, forming a vertically or gradient-distributed directional electrostatic field. This allows charged dust to rapidly accumulate and settle towards the dust collecting electrode 7 under the coupling effect of electric field force and gravity, effectively intercepting the migration path of dust towards the upstream pressure tapping hole. Simultaneously, it achieves efficient dust removal with low turbulence within the channel space, avoiding throttling interference from the electrodes on the main airflow and ensuring the stability of the in-situ flow field for differential pressure measurement. It should be noted that the dust collecting electrode 7 can be a grounded metal plate or metal mesh structure.
[0028] In this embodiment, the electrostatic field generator 5 is used to provide a voltage of 5-20kV to the high-voltage electrode 6.
[0029] Preferably, both the upstream pressure tap 2 and the downstream pressure tap 3 have flared, funnel-shaped openings, further reducing the probability of dust adhesion.
[0030] Furthermore, a dust collection trough 9 is detachably installed at the bottom of the conveying channel 8, which is located downstream of and close to the dust collecting electrode 7. The dust collection trough 9 is connected to the conveying channel 8 to facilitate dust collection and regular centralized cleaning.
[0031] In this embodiment, the conveying channel 8 is a horizontally arranged cylindrical pipe.
[0032] The electrostatic dust removal-based anti-dust clogging differential pressure flowmeter provided in the above embodiment operates such that when the dust-laden airflow passes through the high-voltage electrode 6, the dust particles become charged under the corona discharge and then migrate towards the collecting electrode 7 and are adsorbed under the drive of the electric field. Simultaneously, because the collecting electrode 7 is located below or to the side of the pressure tap area, the charged dust is directionally captured, preventing it from entering the upstream and downstream pressure taps 2 and 3 with the airflow. It is compatible with existing differential pressure flowmeter structures, has low modification costs, and features a filter-free design, reducing pressure loss, ensuring flow measurement accuracy, fundamentally preventing dust clogging, and significantly extending maintenance cycles.
[0033] To facilitate understanding by those skilled in the art of the improvements of this utility model compared to the prior art, some of the accompanying drawings and descriptions of this utility model have been simplified. The above embodiments are preferred implementations of this utility model. In addition, this utility model can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.
Claims
1. A differential pressure flow meter based on electrostatic dust removal, comprising a flow meter body (1) disposed in a conveying channel (8), an upstream pressure tap (2) and a downstream pressure tap (3), wherein a differential pressure sensor (4) is connected to the upstream pressure tap (2) and the downstream pressure tap (3), characterized in that: An electrostatic field generating device is provided in the conveying channel (8). The electrostatic field generating device is located upstream of the upstream pressure tapping hole (2) and is used to generate an electrostatic field in the airflow to charge the dust and deflect it to avoid the pressure tapping hole area.
2. The anti-dust clogging differential flow meter based on electrostatic dust removal according to claim 1, characterized in that: The electrostatic field generating device includes a high-voltage electrode (6) and a dust collecting electrode (7) disposed in the conveying channel (8). The high-voltage electrode (6) and the dust collecting electrode (7) are connected to an electrostatic field generator (5) so that an electric field is formed between the high-voltage electrode (6) and the dust collecting electrode (7).
3. The anti-dust clogging differential flow meter based on electrostatic dust removal according to claim 2, characterized in that: The high-voltage electrode (6) is located at the top or center of the conveying channel (8), and the dust collecting electrode (7) is located at the bottom or side wall of the conveying channel (8).
4. The anti-dust clogging differential flow meter based on electrostatic dust removal according to claim 2, characterized in that: The electrostatic field generator (5) is used to provide a voltage of 5-20kV to the high-voltage electrode (6).
5. The anti-dust clogging differential flow meter based on electrostatic dust removal according to claim 1, characterized in that: The openings of both the upstream pressure tap (2) and the downstream pressure tap (3) are flared structures in the shape of a trumpet.
6. The anti-dust clogging differential flow meter based on electrostatic dust removal according to claim 2, characterized in that: A dust collection trough (9) is detachably installed at the bottom of the conveying channel (8) located downstream of and near the dust collection electrode (7), and the dust collection trough (9) is connected to the conveying channel (8).
7. The anti-dust-clogging differential pressure flow meter based on electrostatic dust removal according to any one of claims 1-6, characterized in that: The conveying channel (8) is a horizontally arranged cylindrical pipe.