Today, venturi is no longer a new concept in the world of industrial dust collection systems. Join Tan Thanh, a leading manufacturer of high-quality dust filter bags and cages, as we explore what is venturi and why it plays an essential role in dust filter equipment.
1. What is venturi?
A Venturi is a device designed to enhance the effectiveness of compressed air pulses based on fluid dynamics principles. It features a converging section leading to a throat, followed by a diverging section. When a pulse is introduced from above, a negative pressure zone is created at the upper exterior, drawing in secondary air into the Venturi tube—thereby increasing the cleaning energy. (Source: Dust Collection Technical Handbook)
As shown in the diagram below, the Venturi pipe design is applied to accelerate the flow rate (v1) of gas or liquid in a pipeline (A1) by constricting it within a conical section (Venturi, A2). This increase in velocity results in a drop in pressure (negative pressure or pressure differential “h”), creating a partial vacuum (static pressure at position 2). When the gas or liquid exits the constriction, the pressure rises again to match the surrounding pipeline pressure (P2).
Let’s explore the close relationship between Ventilation and Venturi in mechanical engineering, especially in the design of systems that regulate airflow within dust filtration systems:
- Ventilation: Ventilation is the process of supplying and removing air from a space to maintain air quality. It can be achieved using fans, duct systems, and other components in a dust recovery, filtration, or exhaust gas treatment system.
- Venturi: The Venturi effect refers to the drop in pressure that occurs when air flows through a narrow section of a tube. This phenomenon is widely used in mechanical applications to measure flow rate, accelerate flow, and create low-pressure zones. In negative-pressure dust filtration systems, conical blowpipes based on the Venturi effect are attached to cylindrical bag filters with steel cages. These structures help increase both the speed and length of the compressed air pulse emitted from the nozzles.
- The Connection: Flow Control: Venturi designs are used to suddenly increase the flow rate of compressed air pulses from nozzles. By directing the pulse through a Venturi section (the narrow tube), the flow speed and pressure can be precisely controlled—optimizing the efficiency of the pulse jet cleaning process.
2. What is the function of venturi in dust filter cages?
In dust collection systems, the Venturi functions as an air amplifier that introduces secondary airflow into the pulse jet cleaning process. This enhances the cleaning air volume, making it more effective at dislodging dust cakes from filter bags.
Without the Venturi, the compressed air pulse alone might not be sufficient, especially for large filter surfaces. The standard air-to-cloth ratio is typically between 3:1 and 6:1, meaning 3 to 6 cubic feet of air per minute passes through each square foot of filter media. This ratio depends on process conditions, including dust type, particle size, and loading, and is often determined by past experience.
The Venturi ensures enough airflow reaches the bags for proper cleaning, even under demanding conditions, improving system performance significantly.
3. Three common types of dust filter cages with venturi
Dust Filter Bag Cage with Galvanized Steel Venturi
The dust filter bag cage with a galvanized steel venturi is a component designed to support the shaking and dust-cleaning process of fabric filter bags. The venturi is directly welded to the cage’s collar using spot welding (resistance welding) techniques.
Features of the galvanized steel filter bag cage with galvanized steel venturi:
- Cost-effective
- Durable and rust-resistant
Dust Filter Bag Cage with Aluminum Venturi
Similar to the galvanized steel cage, the dust filter bag cage with an aluminum venturi also provides effective dust-cleaning performance. Aluminum venturis come in two types: detachable and riveted.
Advantages of this product:
- Combines the benefits of a lightweight, durable, and flexible aluminum venturi
- Corrosion-free, highly oxidation-resistant, and heat-resistant
Dust Filter Bag Cage with Stainless Steel Venturi
The dust filter bag cage with a stainless steel venturi offers excellent dust-cleaning efficiency. The venturi is welded directly to the stainless steel cage.
Advantages of this product:
- Uniform material for both cage and venturi, offering better durability and elasticity compared to galvanized steel
- Corrosion-resistant and highly oxidation-resistant
- Excellent heat resistance and strong chemical resistance
4. Applications of filter cages with venturi
Dust filter cages with Venturi offer up to twice the cleaning efficiency compared to those without. As a result, they are used across a wide range of industries, including:
- Industrial factories
- Incinerators
- Cement plants
- Woodworking facilities
- Ceramic, steel, and non-ferrous metal industries
- Fertilizer and cosmetic manufacturing
- Animal feed plants
- Mining and thermal power stations
- Paint and printing ink filtration systems
5. Where to buy dust filter cages with venturi in Ho Chi Minh City?
Established in 2010, Tan Thanh aims to produce filter bags, filter bag frames for industrial dust collection systems. With over 14 years of experience in the market, Tan Thanh is a pioneer in the field of filter bag production.
With the motto “Technical Accuracy – Competitive Price – On-Time Delivery – Professional Service,” we aim to build long-lasting customer trust and satisfaction.
Why Choose Tân Thanh Filter Cages?
- Experienced engineers who custom-design filter cages for every type of filter bag
- High-quality materials with excellent elasticity and smooth surfaces
- Strong welds that won’t break under pressure, ensuring consistent operation
- Carefully designed air vent holes that enhance cleaning without damaging the filter bag
- Surface treatments available (e.g., zinc-plating, organic silicon coating) upon request
- Options for single-piece or multi-section cages for easy installation
Tân Thanh proudly offers Venturi-equipped filter cages tailored to your dust collector’s design needs.
From designing and manufacturing filter cages to executing full-scale industrial dust recovery systems, Tân Thanh has successfully delivered projects across Vietnam in industries such as cement, steel, chemical, and power generation.
- Hotline: 0917 531 007 – 0901 85 8686
- Email: kelvin@tatafilter.com
- Address: 50 Road No.1 Cu Xa Dien Luc, Truong Tho Ward, Thu Duc City, Ho Chi Minh City, Vietnam.
