Since the production of the first high-pressure 250kg/cm² reciprocation compressor in Japan in 1934, MITSUI SEIKI has run through the world history of
compressors from rotary and twin screw compressors to the Z screw and scroll compressors of today. Here we present the Z screw series in reliable, refined
form to meet customer needs and expectations.
Industrial air filters reduce the number of particles in the air that passes through them. Air filtration supplies the means to reduce the level of particulates in the air to a cleanliness standard required by any definition of "air conditioning." It extends from the simple task of preventing lint and other debris from plugging heating / cooling coils to removing particles as small as 0.1 micron which could cause a short circuit on microchips.
Industrial air filters can come in many configurations, these include: bag filters, box filters, fan filters, HEPA or ULPA filters, filter media, panel filters and pre-filters. A bag filter is a fabric bag through which a gas stream is passed for the removal of particulate matter. A box filter is a box that has filter media fitted into it. Fan filters are usually made from fiberglass or mesh type materials and are intended to prevent the accumulation of lint and other large particles from occurring around the motor and fan. High Efficiency Particulate Air (HEPA) / Ultra Low Particulate Air (ULPA) filters capable of screening out particles larger than 0.3 µm. HEPA filters are used in laminar air flow cabinets (hoods) for sterile transfer work. Filter media is a mat of fibers that provide a barrier to particles entrained in the flow of air or gas. Common configurations include bulk rolls, pads, re-loadable frames, etc. Panel filters are usually made from fiberglass or mesh type materials and are intended to prevent the accumulation of lint and other large particles from occurring in and around heating and ventilation systems. Pre-filters are traditionally depth filters placed before a filter to significantly reduce the particulate loading in the system and thereby allow the filter to operate efficiently at a light particulate loading. Depending on the supplier the frame for the filter may or may not be included in the assembly.
There are several important specifications to consider when looking for industrial air filters. These include porosity, efficiency, filter length, height and width or ring size, and ply. Filter porosity is measured in ppi (average number of pores-per-linear-inch.) The range of ppi provides an open cell with little air restriction to a fine-celled foam for maximum particulate filtration. Efficiency is the ability of the filter to remove a certain amount of particles of a certain size at certain airflow. Most residential filters measure 1" in width, while commercially fitted filters are normally 2". Most filters are standard sizes and shapes. Round bag filters are specified in length and ring size. Ply refers to the layers of media contained in the filter. Ply can be anywhere from one up to five and sometimes greater than five.
There are many types of materials available for industrial air filters. These include, but are not limited to, acrylic, activated carbon, aluminum wire screen, electrostatic fabric, fiberglass, paper, polyurethane foam, polyester and poly/cotton non-woven materials. There are several features that are common to industrial air filters. Filters can offer EMI/RFI protection. Some filters are configured for use in a cleanroom. It is common for filters to be disposable after one use they are not reusable. Industrial air filters are commonly high capacity; they filter high amounts of particles at high airflows. Filters can be multi-pocket and pleated. Often samples will clog filters prematurely and multiple filters may be needed to process single batches, increasing the costs of filtration so pre-filters are used. Many times the filter media will be replaceable while the frame is kept. Reusable filters can be washed for multiple uses. Inlet air filters are also available.
Air compressors are machines that compress and direct air for industrial applications. Small-scale devices are designed for pneumatic tools such as grinders, drills and nail guns. Manufacturing-scale products are used to drive punching and stamping equipment, power robotic tools, and convey parts. Air compressors that are designed for direct-use applications such as sandblasting and spray painting are also available. There are three basic types of air compressors: reciprocating, rotary screw, and centrifugal. Reciprocating air compressors use pistons to compress the contents of an air cylinder and force them into a storage tank. These piston-driven air compressors are designed for intermittent use. Rotary screw air compressors use twin screws instead of pistons to pressurize air. They are designed for continuous use and have a rated duty cycle of 100%. Centrifugal air compressors are turbine engines that use rotating blades to produce high pressures. Typically, these air compressors are used in power generation and large-scale industrial applications.
Selecting air compressors requires an understanding of specifications and requirements such as air quality, temperature, power source, size, and mobility. Some air compressors are equipped with driers (dry compressors) which remove the condensation that is created during compression. Others include coolers that lower the temperature of the compressed air. Air compressors with paper or polyester filters that remove oil, dust, vapors, and other debris are also available. Oil-free air is especially important in applications such as food processing and semi-conductor manufacturing, where as little as one part per billion (ppb) of oil is unacceptable. Smaller air compressors are usually powered by gasoline, diesel fuel, or single-phase electricity. Larger, commercial and industrial units often use three-phase power at 208 V, 230 V, or 460 V. In terms of mobility, portable air compressors feature wheel, casters, or self-contained trailers. Vertical air compressors are designed for fixed mounting and require less floor space.
Pressure, air flow, efficiency, and operating costs are important parameters for air compressors. Air pressure is usually measured in pounds per square inch (psi). Air flow is usually measured in standard cubic feet per minute (SCFM). Reciprocating air compressors can achieve air flows of up to 100 CFM. Rotary air compressors can reach 1500 CFM with a single stage and up to 2500 CFM with two stages. Centrifugal air compressors operate at levels greater than 1000 CFM. With regard to air compressor efficiency, the Compressed Air and Gas Institute (CAGI) has developed a standard set of test criteria. Suppliers of air compressors can provide a CAGI data sheet with information about horsepower, efficiency, and expected energy consumption.
Air compressor parts are used in air compressors and replaced due to wear and usage. There are several basic types of products. Air compressor filters are cylinder-shaped devices that remove water, oil, oil vapor dirt and other contaminants from a compressed air supply. Air compressor valves regulate air intake and exhaust. Air compressor impellers force the flow of air in a specific direction. Air compressor motors use alternating current (AC), direct current (DC), gasoline, or diesel fuel to power air compressors. Pressure regulators are used to raise, reduce and/or regulate the air pressure. Lubricators in compressed air lines atomize oil into aerosol form for injection into the air stream. These air compressor parts provide downstream lubrication of pneumatic tools, cylinders, motors and valves. Block and bleed valves are used to isolate the high-pressure sections of a pressurized air system. Air compressor parts such as breathers, pistons, and pressure gauges are also commonly available.
Specifications for air compressor parts differ by product type. Air compressor filters use paper or polyester filter elements and may contain foam pre-filters. Parameters include inner diameter (ID), outer diameter (OD), height, maximum flow, surface area, and percentage efficiency. Air compressor valves and block-and-bleed valves carry specifications such as valve size, valve flow coefficient, pressure rating, and connection type. Air compressor impellers are made of aluminum, brass, bronze, cast iron, plastic, rubber, or stainless steel. They differ in terms of number of blades or vanes and bore size. Parameters for air compressor motors include shape, style, voltage, frequency, phase, shaft speed, continuous output power, continuous torque, gearbox ratio, and gearbox efficiency. Regulating or adjustment range is the most important parameter to consider when selecting pressure regulators. Lubricators differ in terms of shape, size, and configuration. Air compressor parts such as pressure gauges can use analog or digital displays.
Air compressor parts are available from both original equipment manufacturers (OEM) and aftermarket suppliers. Some companies provide ring seals, after-cooler kits, air / oil separators, bearings, blades, blow-off columns, buffer discs, bushings, check valves kits, circuit breakers, cooler kits, discs, disc valves, gaskets, grommets, nozzles, oil filters, and O-rings. Others suppliers provide springs, coil springs, switches, strainers, thermostats, valves, washers, and crankshafts. Air compressor parts such as couplings, coupling sets, cushion plates, cylinder heads, diaphragms, drive belts, fans, and followers are also commonly available.
