The integrated vacuum generator utilizes a precisely designed sealing structure, combined with material selection, dynamic compensation, and airflow guidance technology, to ensure efficient flow of compressed and entrained air along a predetermined path, while preventing energy loss and performance degradation due to leakage.
The integrated vacuum generator's sealing structure relies primarily on high-precision manufacturing processes and material matching. Main components such as the air supply chamber, vacuum chamber, and air control chamber are typically made of metal or high-performance engineering plastics. CNC machining ensures the flatness and roughness of each interface, reducing microscopic leakage channels. Seals are made of pressure- and temperature-resistant materials such as fluororubber or PTFE, with dedicated sealing rings designed for different pressure zones: a static O-ring seal is used at the connection between the air supply chamber and the nozzle, while a lip seal is used at the interface between the vacuum chamber and the suction cup for dynamic sealing. This dual optimization of materials and structure reduces the risk of leakage at the source.
The sealing design of the airflow path follows the principle of "segmented isolation and step-by-step pressurization." After compressed air enters the air supply chamber from the inlet, it flows to the nozzle through the air supply channel. This section uses a combination of hard and soft metal seals to ensure that high-pressure gas does not leak into the air control chamber. As the high-speed airflow at the nozzle outlet entrains surrounding air, the vacuum chamber prevents reverse airflow through a unidirectional guide (such as a diaphragm valve). Simultaneously, an air filter within the vacuum chamber (such as filter cotton) further purifies the intake gas, preventing impurities from damaging the sealing surface. The connection between the diffuser and the silencer is sealed with clamps or threads, balancing airflow pressure and sealing reliability.
A dynamic sealing compensation mechanism is crucial for handling pressure fluctuations. In the pneumatic control device, the air supply control valve core and the vacuum rupture control valve core engage via a rod and a socket. A return spring provides preload, ensuring the valve core maintains a tight seal against the valve seat under varying pressures. When the air supply pressure changes, the valve core displacement is automatically compensated by the spring force, maintaining the stability of the air supply and vacuum rupture channels. This adaptive sealing design allows the integrated vacuum generator to maintain a balance between sealing performance and airflow efficiency within an air supply pressure range of 0.4-0.7 MPa.
The integrated vacuum generator's sealing structure also incorporates anti-misinstallation and quick-maintenance designs. The gas supply unit, gas control unit, vacuum generator, and vacuum unit are modularly assembled. Each module is precisely aligned using locating pins and guide grooves, preventing seal failure due to installation deviations. The quick-release structure of the clamping plate and guide rails not only simplifies maintenance but also prevents seal damage caused by misoperation through clear distinctions between locked and unlocked positions. For example, when the clamping plate is in the locked position, the mounting positions formed by the left and right clamping positions strictly limit the displacement of the vacuum generator body, ensuring continuous contact of the sealing surface.
Airflow guidance and pressure balance design further enhance the sealing effect. When the high-speed airflow at the nozzle outlet decelerates and pressurizes in the diffuser section, the expansion angle (typically 6°-8°) and length (6-10 times the pipe diameter) of the diffuser tube are optimized through fluid dynamics, ensuring uniform airflow pressure recovery and preventing seal surface impact caused by localized eddies. Simultaneously, the unidirectional guide at the vacuum passage and nozzle outlet allows gas to flow only from the vacuum chamber to the nozzle, preventing exhaust backflow and contamination of the vacuum chamber. This unidirectional sealing mechanism effectively maintains the stability of the vacuum environment.
The integrated sealing structure of the vacuum generator utilizes a deep integration of materials science, fluid mechanics, and mechanical design to construct a multi-layered, adaptive sealing system. From the high-precision manufacturing of the static interface to the spring compensation of the dynamic valve core, and the optimization of the airflow path, every step revolves around the core objective of "preventing leakage and guiding airflow." This systematic design not only ensures the reliable operation of the vacuum generator in industrial environments but also provides sealing technology support for its miniaturization and integration.
