July, 2010:

Liquid-ring (liquid ring) pumps

A distinctive feature of liquid ring vacuum pumps is that the compression of gas in them by a liquid ring, which is driven vane impeller is eccentrically located in the body.

Before starting the pump to the axis is filled with liquid. During the rotation of the impeller blades liquid discarded the body and between the hub of the impeller and the liquid ring formed sickle space divided by shoulder-blades of the impeller on the working cells, the amount of which varies depending on the angle of rotation of the impeller. At the angle of rotation of the impeller, where the volume of working memory increases, they are connected to the suction box and, through him, filled with pumped gas. When the volume of the working cell will be the maximum, it detaches from the suction box. Upon further rotation of the impeller working cell volume decreases, and it is compressed gas. At a certain angle of rotation of the working cell is connected to the positive window, and gas, by reducing the volume of the working cell is pushed out through the discharge window to discharge pipe.

Drive liquid ring pump is misuse of the motor. Motor shaft is connected to the pump shaft via a flexible coupling. Because the gas is compressed liquid in the pump by a good heat transfer between the compressed gas and liquid, and most chat heat of compression is removed from the gas. To maintain the temperature of liquid ring stable, constantly introducing new portions of cold liquid. Too much fluid is discharged from the liquid ring through the discharge window and delivery pipeline in the liquid separator.

The flow of the compression process with intense heat transfer allows to pump easily decomposed, polymerized, flammable and explosive gas and mixture. The presence of liquid ring and an absence of timing allows the pumps to pump gases containing pairs of liquid drops, solid foreign inclusions such as dust and even the abrasive particles. The appropriate selection of the working fluid can be used for pumping with liquid ring vacuum pump aggressive gases. For example, for pumping chlorine concentration is used sulfuric acid (the concentration of H2SO4 – 97 … 98%).

Vacuum pump – a device for removal (pumping) of gases and vapors from the closed volume in order to get it vacuum. There are different types of vacuum pump, whose action is based on different physical phenomena: mechanical (rotational), jet, sorption, condensation.
Basic parameters of the vacuum pump

1. Limit (lowest) pressure (residual pressure, ultimate vacuum), which can be achieved by a pump, pumping rate – the volume of gas pumped at a given pressure in unit time (m3 / s, l / sec).

2. Acceptable (largest) outlet pressure in the exhaust section of the pump, the further improvement which violates the normal operation of the vacuum pump.

Application of vacuum

* High vacuum and high vacuum pumps are used in physics laboratories, high tech, for example, vacuum coaters.

* Low vacuum, and the corresponding vacuum pumps are widely used in technological processes of various industries, in medicine, agriculture, etc. Pumps, creating a low vacuum, used both independently and as a vacuum pump, ie used as the first stages of high-vacuum pumping systems.

The range of pumps is very high on whazzup some examples of their application:

* Waste water and sludge.
* Food and alcoholic beverage industry.
* Biotechnology.
* Production of paints and adhesives.
* Petrochemical industry.
* Chemical industry.
* Plastic Industry.

The advantages of screw pumps

* Possibility of pumping liquids with different levels of viscosity.
* Easy installation, operation, maintenance.
* Biotechnology.
* The product remains unchanged in the transfer process.
* Petrochemical industry.
* Chemical industry.
* High resistance to abrasion and corrosion.
* The minimum noise level.
* Improves overall performance and reduces power consumption.
* Do not have a negative impact on the terrestrial environment.
* Low energy consumption

Pumps are designed to surround ND pressurized dispensing natural and corrosive liquids, emulsions, suspensions, kinematic viscosity of 35 to 800 cSt, the maximum density to 2000 kg/m3, the temperature of -15 to +200 ° C. The concentration of the solid phase, non-abrasive pumped liquid may take up to 10% by weight with grain size less than 1% of the nominal bore diameter of the connections with a maximum particle density to 2300 kg/m3.

Units horizontal simple steps. Scope is determined by the resistance of the material flow part and seals. Material flow part:

* K – nickel steel 12Х18Н9Т;
* D – chrome steel 20H13;
* T – titanium and its alloys.

Possible to make a shirt or no shirt heating or cooling with a supply of drilling fluid or slide.

Available for all engines in common industrial (A) or Ex (B) performance.
Types of units and their symbols:

* ND (r) – regulation of feeding is stopped manually set;
* ND (r) R – Regulation manual feed on the move or when stopped aggregate;
* ND (r) E – Regulation of supply remotely on the go or pausing unit (electric actuator);

… (G) – tightness of the pump is ensured by freely vibrating membrane of Teflon separating the flow part of the drive pump and oil-filled chamber with a plunger moving within it.

Scope pumps dispensing

They are used in technological processes in chemical, petrochemical, fat, food and other industries.

Screw pump – hydraulic machine, a working body of which is the screw: serves as a liquid, including those with high viscosity. Screw pump is a type of rotary pumps, also called worm gear. In case a screw pump is a leading and one or two propeller driven. When rotating the screws where they move along the axis of engagement – closed between the turns of the volume of fluid displaced. Liquids reportedly mostly potential energy, making it significantly increases the pressure.

A variety of wear-resistant screw pumps are ideally suited for use in industry and municipal economy. In addition to pumping liquids, on properties similar to water, screw pumps are used when working with sludge, viscous and shear sensitive clay, heavy material and abrasive fluids.

* Pumps with soft seal used for pumping water, neutral and chemically active liquids with temperatures from -15 to +85 ° C.
* Pumps with end seal used to pump toxic, flammable, flammable and explosive liquids with temperatures from -40 to +85 ° C. This pump is fitted with explosion-proof motors.

Materials used in the manufacture of a vortex pump, dependent on the pumped medium.

Sealed pumps CT – designed for pumping liquids in stationary conditions (including liquefied gases), a pair which may form explosive mixtures with air or contaminate the environment. The main design features sealed electric – no external seals of rotating parts and compact design that combines in a single block of the pump and built-in asynchronous motor.

The design of pumps eliminates pollution, loss of pumped product, reduces the cost of the construction by reducing the cost of sewage treatment.

Elements of the built motor – stator and rotor separated from the pumped liquid thin-walled (0.5 mm) cartridges.

Cooling and lubrication of bearings made of pumped liquid, electric start and work without filling or partial filling of the pumped liquid is not allowed.

In the symbol of pumps (CT – centrifugal hermetic) number in the numerator – the nominal flow (m3 /?) Number in the denominator – nominal head (m), b – Trim wheel next letter – a symbol of the material in contact with the pumped fluid, the number following the letter – the nominal power of the integrated engine, and the next figure – a constructive response, depending on the temperature and pressure of the fluid.

Vortex pumps are designed for pumping water, neutral, flammable, toxic, flammable and explosive, as well as chemically active liquids with temperatures from -40 to +85 ° C with a solids content of not more than 0,01% by weight of up to 0,05 mm .

Parameters of the vortex pump

Vortex pumps are characterized by the work of the vortex wheel, which is a flat disc with short straight radial blades, located on the periphery of the wheel. The body has a circular cavity, which includes the blade and wheels. The inner sealing protrusion, tightly adhering to the outer ends and side surfaces of the blades, shared the suction and discharge pipes connected to the ring cavity.

When wheel spin liquid is keen blades, while under the influence of centrifugal force, twisted. Thus, in a ring cavity of the working pump formed a kind of fresh annular vortex motion, why the pump is called a vortex. The peculiarity of the vortex wheels is that the same fluid particle moving along a helical trajectory, the section from the entrance to the annular cavity to exit repeatedly finds himself in space mezhlopastnoe wheel, where each time receives an additional increment of energy, and hence and pressure. Due to this vortex pump is able to develop the pressure 2-4 times greater than the centrifugal pump with the same diameter wheel and the same speed. This, in turn, leads to a much smaller overall size and weight of vortex pumps in comparison to the centrifuge.

The advantage of vortex pumps is that they possess the self-priming ability (especially pumps SCD air cap), which excludes the need to fill the shell and suction line fluid pumped before each launch.

The disadvantage of vortex pumps is relatively low efficiency (18-40%) and rapid wear of parts at work on liquids containing suspended solids.

For pumping easily solidifying liquids Pumps are manufactured with heating – performance videoconferencing. Structurally, this is done in a more heated lid clamped on the outer cover of the case, form a chamber heating. In the heated lid is connected to the steam pipe steam pressure of 5 kgf/cm2.

To ensure self-suction pumps are manufactured with an air dome – fulfillment SCD. Air cap, attached to the delivery hose has offtake and by injection effect provides the ability to self-priming pump. When water-filled shell can provide a self-suction pump 4 m operating conditions.

Shaft seal pumps – double soft seal or double face (2f).