A vacuum generator is a key component that uses compressed air to generate vacuum. Based on the Bernoulli principle and the Venturi effect, it operates without moving parts and requires no maintenance, making it an ideal choice for automated handling applications. Compared to electric vacuum pumps, it offers significant advantages such as compact size and fast response, especially suitable for high-frequency pick-and-place operations.
Fokca offers three main series: single-stage, multi-stage, and integrated types. All series are available in various versions, including high-flow, mini, and high-vacuum models. With vacuum flow rates ranging from 1.8 to 1550 L/min and weights as low as 6.5 g, they meet a full range of application needs—from handling precision electronic components to gripping heavy workpieces.
A vacuum generator is a key component that uses compressed air to generate vacuum, widely used in applications such as suction cup gripping, workpiece handling, and material picking in automated equipment. It operates based on the Bernoulli principle and the Venturi effect – when compressed air passes through a precision nozzle at high speed, the flow velocity increases sharply, creating a low-pressure area at the nozzle outlet, thereby generating vacuum. The kinetic energy of the compressed air is converted into vacuum energy, extracting air from the suction cup and creating negative pressure to grip the workpiece.
Compared to electric vacuum pumps, vacuum generators offer outstanding advantages such as no moving parts, maintenance-free operation, compact size, and fast response, making them ideal for automated gripping applications that require frequent start-stop cycles.
Based on structure and operating principles, vacuum generators are mainly divided into two categories: single-stage and multi-stage:
◆ Single-Stage Vacuum Generator: Uses a single nozzle structure where compressed air is accelerated once and then directly discharged. It features a simple design, low cost, and fast response, suitable for short-cycle applications with moderate vacuum requirements.
◆ Multi-Stage Vacuum Generator: Uses a series of multiple nozzles where compressed air passes through each stage sequentially, further reducing pressure and enhancing vacuum performance at each stage. Under the same supply pressure, multi-stage designs achieve higher vacuum levels while significantly reducing compressed air consumption, with energy savings of 30-50%.
◆ Integrated Vacuum Generator: Built on single-stage or multi-stage technology, these units integrate solenoid valves, vacuum pressure switches, and blow-off functions, offering a “plug-and-play” solution that greatly simplifies system design and installation.
| Parameter | Single-Stage | Multi-Stage | Integrated |
|---|---|---|---|
| Supply Pressure | 0.35 ~ 0.7 MPa | 0.45 ~ 0.7 MPa | 0.35 ~ 0.7 MPa |
| Max Vacuum Level | -88 kPa | -94 kPa | -95 kPa |
| Vacuum Flow Rate | 1.8 ~ 140 L/min | 30 ~ 1550 L/min | Depends on base type |
| Air Consumption | 11 ~ 185 L/min | 30–50% less than single-stage | Depends on base type |
| Weight | 6.5 g ~ 95 g | 180 g ~ 450 g | Depends on integration level |
| Response Speed | Extremely fast | Fast | Extremely fast |
| Structural Features | Single nozzle, simple design | Multi-stage series, energy efficient | Integrated valve / switch / blow-off |
| Applications | General pick-and-place, short cycle | High-speed pick-and-place, large workpieces, energy saving | Smart integration, robotics, rapid deployment |
| Cost | Low | Medium | Higher |
◆ Complete Series Coverage – We offer single-stage, multi-stage, and integrated series, along with high-flow, mini, and high-vacuum variants, meeting application needs from precision electronic component handling to heavy-duty workpiece gripping.
◆ Significant Energy Savings – Our multi-stage vacuum generators feature an optimized nozzle series design, delivering 30-50% less compressed air consumption compared to single-stage units at the same vacuum level, resulting in substantial long-term operational cost savings.
◆ Fast Response – With no moving parts, vacuum build-up and release response times reach millisecond levels, ideal for high-frequency pick-and-place operations and effective cycle time reduction.
◆ Compact Design – Lightweight and compact, the smallest model weighs only 6.5g. Units can be mounted near suction cups to shorten vacuum lines and further improve response speed.
◆ Integrated Solutions – Integrated models include solenoid valves, pressure switches, and blow-off functions, operating as plug-and-play units that significantly reduce external components and piping work.
◆ Reliable Quality – Every batch undergoes vacuum level testing, flow rate testing, and leak testing to ensure consistent and dependable performance.
◆ Air Supply Requirements – Maintain supply pressure within the rated range; too low pressure affects vacuum level, while excessive pressure wastes energy. Ensure compressed air is filtered (5μm filtration recommended), oil-free, and moisture-free to prevent nozzle blockage from contaminants.
◆ Mounting Position – Install the vacuum generator as close to the suction cup as possible to shorten vacuum lines, reduce pressure loss, and improve response speed. Pay attention to exhaust port orientation, avoiding direct facing toward equipment or operators.
◆ Tubing Connections – Use nylon tubing or hard PU tubing for vacuum lines to prevent collapse under negative pressure. Ensure connections are properly sealed to prevent leakage that could affect vacuum level.
◆ Silencer Installation – Install a silencer on the exhaust port to effectively reduce exhaust noise.
◆ Regular Maintenance – If vacuum level drops or response slows over time, nozzle blockage or seal wear may be the cause. Regularly clean the inlet filter, inspect the nozzle, and replace filter elements or seals as needed.
◆ Blow-Off Release – For fast workpiece release, choose vacuum generators with blow-off function or integrated models.
Handling Leaky Workpieces – When gripping porous or leaky workpieces such as cardboard or wood, select high-flow vacuum generators to compensate for leakage losses.
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