It is imperative to use reliable injection equipment to equip a well. Only with its help it is possible to transport water into the mainline and at the same time maintain a constant pressure in the system. Submersible pumps for the Grundfos well have earned a good reputation among private craftsmen. Minimum body diameters plus high performance rates are the main positive points of Danish equipment.
The device and principle of operation of borehole pumps Grundfos
Units from the Danish manufacturer have a similar device. Models differ only in technical characteristics. The pump body is made of stainless steel, alloyed with nickel and chrome. Depending on the modification of the device, it can be equipped with a single-phase or three-phase motor.
The Grundfos pump operates due to the suction spiral (Archimedean screw). It is located directly in the body of the device. Thanks to this centrifugal impeller, the equipment can operate in a horizontal or vertical position.
When the pump is turned on, the screw rotates and thereby sucks water into the storage chamber. Then he transports it up, pushing it out into the outlet.
Grundfos pumps are designed for clean well water only. The admissible limit of impurities for some models is 50 g / m3.
Advantages and disadvantages
The following advantages are characteristic of pumps from a Danish manufacturer:
- the minimum section of the flask is 76 mm, which allows the device to be installed even in a very narrow casing;
- the presence of functions of protection against water hammer, overheating, idling;
- easy installation;
- high performance and pressure indicators;
- housing resistance to aggressive environments;
- economical power consumption;
- the ability to control the speed of the pump impeller;
- the presence of a check valve in the complete set;
- absence of vibrations, which means the exclusion of damage to the casing or loosening of the bottom of the source;
- the optimal warranty period is 5 years.
The only drawback of the equipment is its price. Some masters consider it to be high. Although the cost of the pump fully justifies itself.
Model range and technical characteristics
- SP series;
- model range SQ;
- SQE series.
The first line is pumps with a 4 ”(100 mm) flask diameter. This severely limits the capabilities of the equipment in a narrow casing well.
The SQE series has the same technical characteristics as the SQ series. But at the same time, all models of the series are equipped with a frequency converter. This maintains a stable pressure in the system. When installing a hydraulic accumulator, pumps of this series are especially good for organizing an autonomous water supply for a country house.
The SQ series is ideal for domestic use.
All models of units are labeled in the following sequence - the name of the series, the capacity (m3 / h), the pressure indicator. For example, the SQ 1-50 model is characterized by a water supply of up to 1 m3 / h at a height of 50 m.
Technical characteristics of modifications of pumps of the SQ series:
- SQ 1. The maximum head in the range is from 50 to 65 m. Productivity - 1 m3 / hour. Average power - 1,650 watts.
- SQ 2. Allows to form the head value at 55, 70, 85, 115 m. Productivity - about 60 l / min. Power - 1,650 W.
- SQ 3. Heads - 65, 80, 95, 105 m. Productivity - about 60 l / min. Power - 2 320 W.Pumps of this series can even pump contaminated ground water.
- SQ 5. Allows to supply up to 5 m3 of water per hour from a depth of 70 meters. The model weighs only 6.4 kg.
When choosing a Grundfos submersible pump, it is important to take into account the well parameters: casing diameter, flow rate and source depth.
How to choose a pump
When buying a Grundfos centrifugal device, you need to rely on the following parameters:
- Aggression. It is determined in total for all vertical and horizontal sections of the pipeline. Every 10 m of the horizontal is equal to 1 m of head.
- The amount of water a family needs per day. It is necessary to summarize the displacement consumed by each plumbing point per hour.
- Static and dynamic water levels in the well.
- Source debit.
When taking into account the flow rate parameters, it is necessary to ensure that the pump performance does not exceed it. Otherwise, the well will drain quickly.
The price of deep well pumps for Grundfos wells varies depending on the series, technical characteristics of the model. In the markets of Moscow, a Danish unit can be bought for an amount of 25,700 to 113,000 rubles. The price may also vary depending on the region of sales in Russia.
