BR VacuumOur main products include vacuum accessories, vacuum valves, non-standard vacuum customization, vacuum pumps, vacuum measurement, vacuum accessories, mass flow meters, and vacuum technology
View More+2025/07
Introduction to VacuumVacuum refers to a space devoid of any matter or with extremely thin gas, typically defined as a state where the pressure is below one standard atmosphere (101325 Pa). It plays a pivotal role in semiconductor manufacturing by providing environments essential for various processes.Applications of Vacuum in Semiconductor EquipmentWafer/Reticle Handling: Utilizes vacuum to securely hold wafers and reticles during processing.Creating Reaction Conditions: Vacuum conditions are crucial for reducing impurities and ensuring high purity and structural integrity of materials used in semiconductor devices.Specific Applications:Crystal Growth Equipment: For instance, in the production of single-crystal silicon using the Czochralski method, a low-oxygen vacuum environment minimizes impurity incorporation, enhancing crystal quality.Compound Semiconductor Growth: Precise control over stoichiometry during growth under vacuum ensures optimal electrical performance of compound semi
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Over the past two decades, vacuum-sealed packaging has rapidly advanced as a key method for food preservation. This technique effectively removes oxygen, preventing spoilage and extending shelf life. Additionally, vacuum packaging—whether in shrink-wrap or modified-atmosphere forms—safeguards food from insect damage and inhibits mold growth. Its advantages include simple, user-friendly equipment, low operational costs, and affordable plastic materials that are both visually appealing and widely accessible. Common vacuum-packaged products range from pickled vegetables (e.g., mustard tubers, kohlrabi, kelp) to meats (sausages, roast chicken, duck), soy products, milk powder, and malted beverages.The fresh produce supply chain often suffers significant losses due to prolonged intermediary stages between harvest and retail, driving up prices. Vacuum packaging mitigates this by reducing spoilage and refrigeration costs, thus stabilizing prices and easing supply-demand imbalances. As a resul
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1. Boyle's Law: When the temperature remains constant, the relationship between gas pressure P and volume V is P · V=constant, that is, P1/P2=V2/V1.2. Gay Lussac's law: When the pressure P is constant, the volume V of the gas is proportional to the absolute temperature T, such as V1/V2=T1/T2=constant. For every 1 ℃ increase (or decrease), the volume changes by 1/273 times.3. Charlie's Law: In the case of a constant volume V, the gas pressure P is proportional to T, that is, P1/P2=T1/T2. A temperature change of 1 ℃ results in a corresponding increase or decrease of 1/273 in pressure.4. Average free path: λ=5 × 10-3/P (cm) describes the average free path of gas molecules.5. Pumping speed calculation: S=dv/dt (liters/second) or S=Q/P, where Q is flow rate, P is pressure, V is volume, and t is time.6. Conductivity formula: C=Q/(P2-P1) (liters/second) represents the ability of fluid to pass through a pipeline.7. Vacuum pumping time: t=8V/S, empirical formula, used to estimate the pumping ti
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In engineering and technical contexts, a space is considered under vacuum as soon as its absolute pressure is below standard atmospheric pressure (101 325 Pa or 1 atm).
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Vacuum degreeis a measure of how much lower the pressure inside a vacuum system is compared to thestandard atmospheric pressure(1 atm = 101.325 kPa).Formula:Vacuum degree=Atmospheric pressure−Absolute pressureUnits:mmHg(Torr)kPa(kilopascals)mbar(millibar, 1 mbar = 100 Pa)% vacuum(percentage of full vacuum, where 100% = 0 Pa absolute)Example:If a vacuum chamber has anabsolute pressure of 50 kPa, then:Vacuum degree=101.325 kPa−50 kPa=51.325 kPaClassification of Vacuum Levels:Vacuum RangeAbsolute PressureLow (Rough) Vacuum1 atm → 1 mbarMedium Vacuum1 → 10⁻³ mbarHigh Vacuum (HV)10⁻³ → 10⁻⁷ mbarUltra-High Vacuum (UHV)10⁻⁷ → 10⁻¹² mbarExtreme-High Vacuum (XHV)<10⁻¹² mbarKey Point:A highervacuum degreemeans alower absolute pressure(closer to perfect vacuum).
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A vacuum pump is any device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. First developed in the 17th century by Otto von Guericke, modern pumps are indispensable in laboratories, manufacturing, and high-technology industries.Main Types• Positive-displacement pumps (e.g., rotary vane, diaphragm, piston) physically expand and contract chambers to trap and expel gas.• Momentum-transfer pumps—diffusion and turbomolecular—use high-speed blades or vapor jets to impart kinetic energy to gas molecules, pushing them toward the exhaust.• Entrapment pumps such as cryopumps, ion pumps, and getter pumps condense or chemically bind gases without moving parts, achieving ultra-high vacua (<10⁻⁹ mbar).Key Performance Metrics• Ultimate pressure: the lowest achievable pressure under ideal conditions.• Pumping speed: volume flow rate at the inlet, typically expressed in m³ h⁻¹ or L s⁻¹.• Compression ratio: exhaust-to-inlet pressure ratio across the pump.App
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