Overview of the Gnome pump - specifications and customer reviews

For water supply to the oil and gas industry, heat and nuclear energy, metallurgy, utilities and households, pumps are often needed for supplying and pumping contaminated water. At the same time, operating conditions can be very different: from high temperatures and severe pollution to an increased degree of danger of the pumped liquids. In any case, the gnome submersible pump, designed to work in special conditions, will cope with the problem.

Design and principle of operation of the device

The installation consists of two parts, united in a common monoblock: pump compartment and engine. A sealed vertical squirrel-cage induction motor is located at the top of the device. The rotor shaft is mounted in two rolling bearings.

The engine is cooled by the pumped liquid. Its sealing on the shaft is carried out by means of a mechanical seal. Oil is poured into the internal cavity, which serves to cool and lubricate the bearings.

The internal structure of the mud pump "Gnome"

In addition, in the upper part of the engine there is a compensator of thermal expansion for the coolant, made of rubber. Thermal fuses are built into the stator, which turn off the system when the maximum permissible temperature is exceeded. In the pump compartment there is an impeller and a branch. The quick-disconnect design of the device housing allows you to disassemble it without the use of special tools, which greatly facilitates the cleaning and repair of pumps by the gnome.

Before switching on, the unit must be immersed in liquid no less than 500 mm. After starting, the pumped medium is sucked into the housing through the grid. The principle of the mechanism is based on the use of centrifugal force created by the impeller, which moves the fluid from the center to the periphery and pushes it out of the pump compartment with force. It is worth noting that centrifugal systems have not as high efficiency as, for example, volumetric mechanisms, but their cost is an order of magnitude lower.

Scope and features of operation

The device is used for pumping contaminated non-explosive liquids, the temperature of which does not exceed 35 ° C, however, there is a version Tp that is designed to work with water heated to 60 ° C, and several models for pumping water contaminated with oil products. The maximum content of solid impurities in the liquid should not exceed 10%, their size - less than 5 mm, density - not more than 2500 kg / m3. A standard gnome drain pump is used for:

• Drainage and irrigation in agriculture.
• Pumping flood and groundwater from pits, cellars, construction pits.
• Discharges of wastes from car washes, washing machines and condensate in large quantities in central heating or ventilation systems.
• Work with antiseptic and treatment facilities as the main and auxiliary mechanisms.
• Providing various technological processes for any industrial enterprises.

The traditional gnome pump design involves two installation options. It can be produced both mobile, with flexible piping, and stationary with rigid. During operation, the device must be located strictly upright and immersed in water, only this way the motor can fully cool. The installation must be lowered into the liquid with a strong cable to prevent damage to the power cable and terminal connection device.

Pumps from different manufacturers: their advantages and disadvantages

Most often on the market you can find products of the Odintsovo Pumping Plant and MNZ No. 1. The indisputable advantages of the first group include:

• The ability to select devices of two main modifications: without a cooling jacket or with it.
• High build quality that guarantees reliability and eliminates rejects.
• Thoughtful design.

According to customer reviews, the main disadvantages are the high cost of the plants, too expensive repairs and expensive spare parts for them. In addition, due to an unofficial policy of the manufacturer, a free warranty repair is almost impossible. It is worth noting that there are very few models of this manufacturer designed for domestic needs.

Everyone who used the devices of the Odintsovo plant emphasizes that these are excellent quality installations that should be purchased for those who want to get high reliability, however, for decent money.

Anyone who decides to purchase such a pump should pay attention to models with a cooling jacket. It allows the device to work in a semi-submerged state and significantly extends its life.

Pumps from Odintsovo can be produced with or without a cooling jacket

The products of the plant MNZ No. 1 are distinguished by:

• The lowest cost in comparison with other manufacturers.
• Low cost of repair and spare parts.
• The possibility of pumping heavily contaminated water, such as drains from car washes, liquids containing cement, etc.
• Light weight device.

However, buyers note that in the process of operation, a number of significant disadvantages are manifested:

• Low build quality.
• High sensitivity to deviations of the standard of voltage in the network, up to the failure of the electric motor and starting capacitor.
• Fragility of plastic parts: lower filter casing and carrying handle.
• Unsuccessful design of the oil chamber, due to which, during poor-quality assembly, oil may leak from the chamber into the outlet pipe of the installation.
• Assembly on tie rods sometimes leads to misalignment of the bearing shield or top cover, which can cause jamming of the rotor of the electric motor.

The pump can operate only in a completely submerged state, otherwise severe overheating and engine failure can occur.

The most inexpensive gnome pumps are devices manufactured by MNZ No. 1

According to reviews, the gnome water pump produced at MNZ No. 1 copes well with its functions during quite rare emergency operations. In addition, it is purchased for operation in difficult conditions, when for the sake of completing a task, the safety of a relatively inexpensive mechanism can be neglected. These plants are repairable, and the low cost of their spare parts, excluding the engine, allows them to compete with more reliable, but much more expensive devices from other plants.

Less often on the shelves there are pumps manufactured by Livhydromash and Polesieelektromash. These are reliable and high-quality models.However, their cost is also quite high, in addition, if repairs are necessary, difficulties may arise due to the small number of service centers in Russia. Devices are most often sent directly to the factory.

Livne gnomes - high-quality and reliable installations

A variety of gnome pump models makes it easy to find the optimal one. The devices have established themselves as an almost indispensable option that allows you to quickly and efficiently solve the problem of pumping a sufficiently large volume of liquid with a wide variety of contaminants.