The water ring vacuum pump (referred to as the water ring pump) is a rough vacuum pump. The ultimate vacuum that can be obtained is 2000~4000Pa, and the series atmospheric injector can reach 270~670Pa. The water ring vacuum pump can also be used as a compressor, called a water ring compressor, which is a low pressure compressor with a pressure range of 1 to 2 x 105 Pa gauge. The water ring vacuum pump was originally used as a self-priming pump and was gradually used in many industrial sectors such as petroleum, chemical, machinery, mining, light industry, medicine and food. In many processes of industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum regain and vacuum degassing, water ring vacuum pumps are widely used. Due to the rapid development of vacuum application technology, water ring vacuum pumps have been paid attention to in the acquisition of rough vacuum. Since the gas compression in the water ring vacuum pump is isothermal, the flammable and explosive gas can be removed, and the dusty and water-containing gas can be removed. Therefore, the application of the water ring pump is increasing. The working principle of the water ring pump is as follows: an appropriate amount of water is used as the working fluid in the pump body. When the impeller rotates clockwise in the direction indicated in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the upper portion of the water ring is just tangent to the impeller hub, and the lower inner surface of the water ring is just in contact with the tip of the blade (actually the blade has a certain depth of insertion within the water ring). At this time, a crescent-shaped space is formed between the impeller hub and the water ring, and this space is divided by the impeller into a plurality of small cavities having the same number of blades. If the upper part of the impeller is 0°, the volume of the small cavity becomes smaller from 180° before the rotation, and it communicates with the suction port on the end face. At this time, the gas is sucked in, and when the inhalation is finished, the cavity is small. It is isolated from the suction port; when the impeller continues to rotate, the small cavity becomes larger and smaller, so that the gas is compressed; when the small cavity communicates with the exhaust port, the gas is discharged outside the pump. In summary, the water ring vacuum pump relies on the change of the pump chamber volume to achieve the suction, compression and exhaust, so it belongs to the variable displacement vacuum pump. Water ring pumps have the following advantages over other types of mechanical vacuum pumps: 1. The structure is simple, the manufacturing precision is not high, and it is easy to process. 2, compact structure, the pump has a high number of revolutions, generally can be directly connected with the motor, without the need for a speed reducer. Therefore, with a small structural size, a large displacement can be obtained, and the footprint is small. 3. The compressed gas is substantially isothermal, that is, the temperature of the compressed gas process changes little. 4. Since there is no metal friction surface in the pump chamber, there is no need to lubricate the pump and the wear is small. The seal between the rotating member and the fixing member can be directly completed by a water seal. 5, even suction, stable and reliable work, easy to operate, easy to maintain. Water ring vacuum pumps also have their disadvantages: 1, low efficiency, generally around 30%, preferably up to 50%. 2, the degree of vacuum is low, not only because of structural constraints, but more importantly, by the saturated vapor pressure of the working fluid. With water as the working fluid, the ultimate pressure can only reach 2000~4000Pa. Use oil as working fluid, up to 130Pa. In short, since the gas compression in the water ring vacuum pump is isothermal, it is possible to remove flammable and explosive gases. Since there is no exhaust valve and friction surface, it is possible to remove dusty gas, condensable gas and gas-water mixture. With these outstanding features, despite its inefficiency, it is still widely used.
Garlic has always been treated as
a natural antiseptic since ancient times, saying that "natural
antibiotics".
Garlic as a condiment, widely used
in cooking, food processing field .Shandong Province is the famous area of producing planting garlic,The garlic in here has full grain, and high garlic allicin
composition .So it is welcomed by consumers around the word.
Garlic divide into 4L (diameter
greater than 6.5cm), 3L (6.5CM- 6.0CM), 2L (6.0CM-5.5cm) ,L(5.5CM-5.0CM)and other
specifications according to its diameter,The packing method is that packed in
weight 10kg
/CTN,20kg/CTN,10kg/bag,20kg/bag or packed by the number (3 per bag)..
Japan also has a small scale experiment with more than 30 volunteers, showing that garlic extract may inhibit the occurrence of colorectal adenoma. But a large study by the Peking University and the Beijing Cancer Hospital, a large study shows that: short term Helicobacter pylori treatment can reduce the appearance of the stomach precancerous lesions, and vitamin and garlic supplements have no effect. Garlic Garlic Cloves, Seasoned Fresh Garlic, Garlic Tablets,Pure white garlic,Cangshan Shandong garlic,Jinxiang Shandong garlic Weifang Wangyuan Food Co., Ltd , http://www.wangyuanfoods.com
In the face of these inconsistencies, or even contradictory findings, the National Cancer Institute (NCI) is "not recommending any dietary supplements to prevent cancer, but that garlic is a potential cancer resistant vegetable". For most people, it's safe to eat it, except for the garlic. Garlic has the role of anti coagulation, which is not a problem for the average person, but if the operation before and after the surgery, and those who are prone to bleeding and bleeding difficulties, this "side effect" is worth noting.
Eat garlic whether to cancer