- GREAT WALL INDUSTRY HOLDING LIMITED

Tromping through spring sunlight

Hey, remember that frazzled old fellow you saw in the hardware store checkout line last week?
The one whose face was grey with week-old stubble, wild of hair and eye, obviously unwashed and dazed from lack of sleep, looking old beyond his years. Clad in sugar-caked work pants and mackinaw, wearing his cleanest dirty shirt over a T-shirt that can’t remember what it was like to be white, he has the look of a man trying to remember what day it is.
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Overheated motor causes evacuation of Thornton Hall

San Francisco firefighters responded to a fire alarm set off by a overheated motor on the 8th floor of Thornton Hall Thursday.
Smoke from mechanical room 800T set off the alarm at 11:52 a.m. on the 7th and 8th floors, said University Spokeswoman Ellen Griffin.
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Vacuum pumps

Diaphragm pumps offer the advantage of the fluid chamber being totally sealed from the pumping mechanisms. An eccentric connecting rod mechanically flexes a diaphragm inside the closed chamber to create a vacuum. This results in somewhat lower vacuum compared to that produced by a reciprocating piston. However, the diaphragm's lower compression ratio -- low flow, large diameter, and short stroke -- makes for quiet, economical, and reliable operation. The design is available in both one and two-stage versions. Single-stage pumps provide vacuum up to 25.5 in. Hg, while two-stage units are rated to 29 in. Hg.
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Vacuum pumps(1)

In principle, industrial vacuum pumps are merely compressors run with the inlet attached to the vacuum system and the outlet open to exhaust. In smaller sizes, compressors and vacuum pumps are often identical machines. However, in the large sizes that might power a plant-wide vacuum system, the machines differ in minor ways that are intended to enhance efficiency for one application or the other. Manufacturers strongly advise that the same machine not be used for both vacuum and compression at the same time. The heavy loads will damage it.
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Type 2X Double-stage Rotary Vane Vacuum Pump

Sealed containers for gas access to the vacuum extraction of the basic equipment for electronics, refrigeration, electric light sources, chemical industry, hospitals, bottle lamps, packaging, dehydration, drying and other industries. (But can not be used for extraction of oxygen is too high, there is explosive, corrosive to metal on the vacuum oil from the chemical reaction and containing the particles, dust gases, can not be used as transfer pumps and the use of compression pumps). The main models have: 2X-2A two-stage rotary vanevacuum pump 2X-4A two-stage rotary vane vacuum pump 2X-8 two-stage rotary vane vacuum pump 2X-15 two-stage rotary vane vacuum pump 2X-30A two-stage rotary vane vacuum pump 2X -70A two-stage rotary vane vacuum pump.

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Rotary Vane Vacuum Pump Rotary Vane

with the Bias rotor cavity for rotary pumps at sports, so separated from the rotary vane pump cavity Studio cyclical changes in volume in order to achieve the exhaust of vacuum pumps, rotary vane, also known as vacuum pump. Rotary Vane Vacuum Pump works. Rotary Vane Vacuum Pump by pump body (stator) and rotor components. Rotor slot in the rotation with two or more films, among some Rotary Vane Pump is also equipped with a spring. Eccentric to the rotor installed in the pump cavity, the outer edge of the pump cavity and the gap between the top surface for 2 to 3 microns. The rotor spins, centrifugal force, such as the effect of rotary vane sliding back and forth along the trough for the pump chamber wall and always keep in touch, will pump chamber is divided into two or more variable volume of the studio. Rotor rotates clockwise, and the same inspiratory inspiratory mouth cavity volume increases from zero, to reduce gas pressure cavity, the gas was pumped continuously from the inspiratory mouth inhalation. At the same time, with the exhaust port connected to the exhaust cavity volume by the change in small, inhalation of the gas cavity is compressed when the gas pressure higher than atmospheric pressure, open the valve from the atmosphere. Rotor for rotation, have been the exhaust pump.
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Oil-free dry-type mechanical vacuum pump working principle brief introduction

do mechanical oil-free vacuum pumps (also referred to as dry-type mechanical pump) is the atmospheric pressure from the pump exhaust start, while gas will be pumped directly into the atmosphere go, pumping cavity without oil or other medium, but also the limits of pump pressure and vacuum pump oil seal or near the same order of magnitude of the mechanical vacuum pump.
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The working principle of a variety of vacuum pumps

Pump is a wide noodle substantial general-purpose machinery and equipment, it is widely used in petroleum, chemical, power metallurgy, mining, ship selection, light industry, agriculture, civil and
Defense departments, in the national economy played an important role. According to statistics of 79 years, our country pump output reached 1,256,000 units, mainly in the category Centrifugal pumps Everyone probably knows, but also a variety of pumps may be more upset that they still use very broad, such as: aluminum nitrate magnesium nitrate pump pump pump iron nitrate denitrification Acid copper zinc nitrate pump pump pump mercury nitrate nitrate silver nitrate ferrous pump pump pump LiBr potassium bromate bromine water pump pump pump zinc bisulfite sodium pump linoleic acid
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New generation of vacuum pumps

Busch has launched a completely revamped new generation of rotary vane vacuum pumps in the R 5 series.Three pump sizes with a suction capacity of 10, 16 or 21 cubic metres per hour produce an ultimatepressure of 0.5, 1 or 20 hPa (mbar), depending on the version. All sizes and versions offer stableperformance characteristics, i.e. a high suction capacity is guaranteed even in the working pressurerange. Thanks to their extremely compact design, these vacuum pumps are suitable for an installationin very confined spaces. A standard non-return valve in the suction pipe prevents ventilation of therecipient if the vacuum pump is turned off. The new R 5 rotary vane vacuum pumps are each driven bydirectly flanged standard motors. The main fields of application are vacuum packing machines, foodprocessing machines, transportation and lifting devices and the plastics industry. Busch R 5 rotary vane vacuum pumps are available with a large range of volume flow rates from 6 to1,600 cubic metres per hour. The proven vane principle has been standard in numerous industrialsectors for many years. R 5 rotary vane vacuum pumps are very rugged, operationally reliable and havea high maximum tolerable water vapour inlet pressure thanks to the integrated oil circuit. All R 5vacuum pumps are equipped with an oil separator as standard. This is fitted with air de-oilingelements that were especially developed for these vacuum pumps. This guarantees clean exhaust air.

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Vacuum unit conversion

Vacuum unit conversion
× 103 6.895 × 104 68.95 6.805
× 10-2 7.031
× 10-2 2.086 1
1, different density of air molecules under pressure

P (ADS) 1 10-3 10-4 10-5 10-6 10-9
n0 (a / cm 3) 4 × 1016 4 × 1013 4 × 1012 4 × 1011 4 × 1010 4 × 107

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