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2021-01-18

How to choose a pump?

The function of a vacuum pump is to remove gas molecules from the vacuum chamber, thereby reducing the gas pressure inside the chamber and achieving the desired degree of vacuum. Generally speaking, there is a wide range—from atmospheric pressure all the way down to extremely high vacuum—and so far, no single vacuum system can cover this entire range. Therefore, to meet the process requirements, efficiency, and service life of different products, it’s necessary to select different vacuum system configurations for various vacuum stages. To achieve the optimal configuration, when choosing a vacuum system, you should take into account the following points: 1. The ultimate pressure of the vacuum pump should match the working pressure required by the process. Typically, the pump’s ultimate pressure should be about one order of magnitude lower than the process requirement. 2. Each type of pump has a specific operating pressure range; therefore, the pump’s operating point should be within this range and never allowed to run continuously beyond the permitted working pressure. 3. At its operating pressure, the vacuum pump must be able to evacuate the total amount of gas generated during the vacuum equipment’s process. 4. Selecting a vacuum unit: (1) When a single pump cannot meet the pumping and vacuum requirements, several pumps need to be combined and used in tandem to complement each other and satisfy the process demands. (2) Some vacuum pumps cannot operate at atmospheric pressure and thus require a preliminary vacuum stage; others have an outlet pressure lower than atmospheric pressure and therefore need a forepump. Hence, these pumps must be combined for use. A combination of pumps like this is called a vacuum pump unit, which can help achieve better vacuum levels and higher pumping speeds for the vacuum system. We should carefully select the appropriate combination of pumps, as different pumps have varying requirements for the gases they can handle—for example, under normal circumstances, a Roots-rotary vane pump combination is not suitable for systems containing large amounts of condensable gases. 5. If you choose an oil-sealed pump, you should first determine whether your vacuum system has any requirements regarding oil contamination. If the equipment strictly requires oil-free operation, you should opt for oil-free pumps such as liquid-ring pumps or cryogenic pumps. If the requirements are less stringent, you can choose oil-lubricated pumps and supplement them with measures to prevent oil contamination—such as installing cold traps, oil traps, baffles, and other devices—to still achieve clean vacuum conditions. 6. Understand the composition of the gas being pumped: Does the gas contain condensable vapors? Are there any particulate dusts? Is the gas corrosive? When selecting a vacuum pump, it’s crucial to know the gas composition and choose a pump that matches the specific gas being pumped. If the gas contains vapors, particles, or corrosive substances, you should consider installing auxiliary equipment—such as condensers or dust collectors—at the pump’s inlet pipeline. 7. When selecting an oil-sealed vacuum pump, you should also consider the environmental impact of the oil vapor (oil smoke) emitted by the pump. If the environment cannot tolerate any pollution, you should choose an oil-free vacuum pump or ensure that the oil vapor is vented outdoors. 8. Consider whether the vibrations generated by the vacuum pump during operation will affect the process or the surrounding environment. If the process cannot tolerate vibration, you should select a pump that produces no vibration or take measures to reduce vibration. 9. The cost of the vacuum pump, as well as its operating and maintenance expenses. Only after taking all these factors into account can you finally determine a solution that best suits your needs: (1) The lowest investment cost. (2) The lowest production and operating costs. (3) A feasible solution that reasonably and evenly balances the first two considerations. For more information, please call our consultation hotline: 0535-2980329

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2021-01-19

Are dry vacuum pumps widely used? How do you choose the right model when using them?

1. Based on Actual Conditions In actual product applications, we need to make timely adjustments to product models based on specific real-world conditions. In the field of industrial production, when using dry vacuum pumps, it’s also important to select the appropriate model based on the specific conditions and requirements of each manufacturer. Generally speaking, choosing a model that matches these conditions will ensure optimal performance. 2. Based on the Nature of the Medium During the operation of dry vacuum pumps, it’s essential to select the right model according to the different properties of the medium being handled—for example, whether the material is corrosion-resistant or explosion-proof. We need to choose the appropriate model based on these material characteristics. 3. Consider the Specific Vibration Level In daily production, when selecting a dry vacuum pump, it’s also necessary to take into account the vibration level of the material involved—whether the vibration is pneumatic or electric. Depending on the type of vibration, we can choose different models, which can greatly facilitate the production process. Therefore, when selecting a model, it’s often crucial to pay attention to the specific vibration level. In fact, in addition to considering the points mentioned above, when choosing a model for a dry vacuum pump, we should also take into account factors such as water levels and varying terrain conditions, since different models typically have distinct application ranges.

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2021-01-19

Why is the rotary vane vacuum pump so widely used in cooked food processing and fruit and vegetable preservation?

First, the fruits and vegetables we harvest are still living organisms. They obtain essential substances and energy through respiration. On the one hand, respiration sustains the life of the organism; on the other hand, it consumes stored substances, thereby accelerating the aging process of fruits and vegetables. Thus, the goal of preservation is to slow down this aging process. To achieve this, we must control respiration, and the factor most closely related to respiration is temperature. Respiration not only releases energy but also raises the product’s temperature. In turn, this elevated temperature further promotes respiration, hastening the aging of fruits and vegetables. Clearly, if we can lower the temperature of fruits and vegetables, we can effectively control respiration and delay aging. Therefore, after harvesting, fruits and vegetables must be pre-cooled as quickly as possible to remove heat and reduce respiratory heat generation, thus creating favorable conditions for extending their shelf life. Currently, natural cooling is widely used, but it has several drawbacks: it requires a large area, takes a long time, and not only struggles to meet the demands of rapid pre-cooling but is also unsuitable for industrial-scale production. Some facilities directly place produce into cold storage for cooling, which is both costly and fails to ensure quick, uniform cooling. After cooked food is processed, it must be cooled before packaging. Traditional cooling methods include indoor cooling, natural cooling, forced-air ventilation cooling, and air-conditioned room cooling. These methods not only take a long time, have slow turnover rates, and occupy large spaces, but also result in uneven cooling—often with significant temperature differences between the surface and the center of the product. More importantly, they can compromise food hygiene and safety. During the cooling process, bacteria from the air inevitably adhere to the food, causing “secondary contamination.” Especially when the temperature is inappropriate, bacteria can multiply rapidly. If bacteria pass through this temperature range too quickly, the number of generations required for bacterial reproduction can be drastically reduced, making it easier to control the initial bacterial load and enhancing food safety while extending shelf life. This is of great significance for implementing food safety laws. It’s evident that the food processing industry needs advanced methods and equipment to achieve rapid cooling of its products. The principle behind vacuum cooling is to utilize the heat absorption generated by water evaporation. Consequently, water vapor is produced during the cooling process. If this water vapor were to enter the rotary vane pump directly, it would emulsify the pump oil, not only impairing pump performance but also potentially damaging the pump itself. The solution is to install a water trap upstream of the pump, which condenses the water vapor at low temperatures and drains the resulting liquid. To accomplish this, the refrigeration system must be reconfigured to allow the vacuum pump to exhaust air that has been stripped of water vapor. Under the action of a rotary vane vacuum pump, a vacuum cooler for fruits and vegetables can keep vegetables fresh and lock in their moisture, achieving an effective pre-cooling effect. In short, vacuum cooling enables vegetables to cool down more rapidly after harvest without losing their original moisture content—this is precisely where the advantages of the rotary vane vacuum pump become fully apparent.

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2021-01-19

What should be noted before using a rotary vane vacuum pump?

1. Vacuum pump oils for rotary vane vacuum pumps of different types and grades must not be mixed. 2. When the rotary vane vacuum pump is not in use, please seal both the inlet and outlet ports with rubber plugs to prevent foreign objects from entering the pump. 3. Pay attention to the steps outlined in the product operating instructions. Connect the three-phase power cable according to the specifications, ensuring that the rotation direction of the three-phase motor matches the arrow direction on the pump bracket. For single-phase motors, simply plug them directly into a power socket. Only after passing the trial operation can you begin normal operation. 4. The rotary vane vacuum pump and its surrounding environment should always be kept clean to prevent debris from entering the pump body. 5. The connecting pipe at the inlet of the rotary vane vacuum pump should not be too long. Be sure to check that the external connecting pipes, joints, and containers are leak-free and properly sealed; otherwise, it may affect the ultimate vacuum and reduce the service life of the vacuum pump. 6. If a vacuum pump becomes contaminated during use, it must be disassembled and cleaned. Please ensure that only qualified vacuum pump technicians perform the disassembly and cleaning, following the prescribed maintenance procedures to avoid damaging the machine. 7. When unpacking, first check whether the purchased rotary vane vacuum pump has been damaged during transportation and whether it meets the required specifications. If you have any questions or concerns, please call our sales engineer immediately. 8. Before using and commissioning the rotary vane vacuum pump, carefully read the user manual, strictly follow the product operating procedures, and pay attention to first unscrewing the oil-filling screw plug and adding oil up to the 2/3 mark through the oil-filling port. Then, add a small amount of pump oil through the inlet pipe port to enhance lubrication within the pump chamber. If the oil level in the exhaust valve is too low, it will fail to provide proper sealing and affect the vacuum degree; if it’s too high, it may cause oil spray. 9. The rotary vane vacuum pump is equipped with a double anti-backflow device. If backflow occurs, promptly contact a professional technician for repair and resolution. 10. Do not use the pump to draw gases containing particles, dust, or substances that are gel-like, aqueous, liquid, or corrosive. 11. If the rotary vacuum pump is improperly stored or used, allowing moisture and other volatile substances to enter the pump and affecting the ultimate vacuum, open the gas ballast valve for purification. If the pump oil becomes contaminated by mechanical or chemical impurities, replace the oil immediately. 12. Do not use the pump if there are system leaks or if the container connected to the vacuum pump is excessively large and operates under prolonged vacuum conditions. 13. Depending on the pump’s working environment temperature requirements—generally between 5℃ and 40℃—with relative humidity no higher than 85% and an inlet pressure of 1.3×10³ Pa—vacuum pumps with a pumping speed above 0.5 l/s are equipped with a ballast valve. If the relative humidity is high, you can open the ballast valve to purify and remove a small amount of water vapor without contaminating the pump oil, thus extending the oil’s service life. After purification, you can promptly close the ballast valve. 14. During operation, the oil level in the rotary vane vacuum pump’s oil tank must not fall below the center of the oil-level indicator. 15. Do not use the pump to draw gases containing particles, dust, or substances that are colloidal, aqueous, liquid, or corrosive. 16. Instructions for changing the oil in the rotary vane vacuum pump: First, start the pump and run it for half an hour to dilute the old oil. Then, stop the pump, loosen the oil drain plug, and drain the dirty oil. Next, open the inlet port and run the pump for two minutes. During this time, slowly add a small amount of clean vacuum pump oil through the inlet port to flush the pump interior. After draining the dirty oil, re-tighten the drain plug, then loosen it again and use a funnel to add clean vacuum pump oil through the inlet port. Because the rotary vane vacuum pump maintains isothermal conditions during gas compression, it can handle dusty gases and flammable/explosive gases while offering these outstanding features, and its quality is also quite good. The above are the operating instructions for the rotary vane vacuum pump provided for your reference. If you’d like to learn more about vacuum pumps or have any technical questions or product needs related to vacuum equipment, feel free to reach out to us for consultation.

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2021-02-26

How to Choose a Pump

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2022-07-23

The Zibo “China-Korea Vacuum Pump Equipment Research Center” has been established in the Economic Development Zone.

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