Downhole pump grundfos sq. Borehole pumps of the Grundfos SQ series. Additional features of SQE pumps

Grundfos SQ series borehole pumps are a three-inch (or 76 mm) device with multi-stage functionality. The main working elements are "floating" wheels with their own bearings made of ceramic to reduce friction, as well as a single-phase electric pump motor with a permanent magnet, which provides a sufficiently high functional efficiency with a wide power range.

This series of borehole pumps differs from other analogues in a smooth start, the presence of a number of protective functions from reverse in case of possible axial displacement, from overvoltage or voltage dips, overload or overheating of the structure is excluded.

Each model also includes a detachable cable connector.

Grundfos SQ series borehole pumps have proven to be effective as the main link in creating a reliable water supply system using wells or wells in the private sector, in suburban areas or at production facilities with autonomous water supply. Their high performance allows you to solve problems of various complexity, and a wide range of models will help you choose the optimal device in accordance with the desired result.

• Absolute reliability of each model.

Considering the installation environment of the Grundfos SQ series borehole pump, the manufacturer uses highly corrosion-resistant stainless steel as the material of the unit body. Also, in a number of internal elements, in particular bearings, technological composite materials are also used, which reduce the wear of the modules and increase the service life. These advantages of the Grundfos SQ series pumps are complemented by unique protection systems and perfect process controllability, eliminating any risk of emergency situations.

• A wide range of performance is the key to achieving high functional efficiency.

The modern design of the housing of this unit consists in the absolute optimization of its design, which made it possible to achieve impressive efficiency in the hydraulic part, combined with low consumption of electrical energy.

• Installation does not require special tools and knowledge.

The pump is an elongated tubular design that allows for convenient installation of the station in a horizontal or vertical design. Placement does not require any effort and can be done independently or with the involvement of specialists. The simplification also affected the operating conditions, which is based on the automatic operation of the device. The same is true for service: in case of silting, dismantling is easy. The whole structure is modular with easy disassembly.

• Complete security.

The electric motor eliminates the risk of fuel substances and other chemical compounds entering the drinking water. The cable included in the package is made of special rubber used in the food industry, which is confirmed by the relevant certificates. There is no inconvenience associated with high noise operation.

• Additional control options.

The basis for controlling the pumps of the Grundfos SQ series is the complete automation of the entire process. At the same time, the device independently selects the operating mode depending on the operating conditions, maintaining high performance combined with stable operation of the entire system without increasing energy costs.

The lineup

In fairness, it should be noted that all Grundfos SQ borehole pumps are available with a cable, the difference is that in some models it is 1.5 m, which involves additional installation, in others it is pre-installed and equal to the immersion depth of the pump. For example, in the Grundfos SQ 2-55 model, the cable is 60 m, which allows you to immediately install the equipment in the well.

The main advantage of purchasing a pump without a cable can be considered a more affordable price, which is 30-40% lower than an analogue in a complete set. Therefore, the financial issue is often decisive, but before making a final choice, you should be aware of some literally “pitfalls” that need to be considered.

The cable pre-installed at the factory fully complies with the requirements for it, taking into account its place of operation: all connections are sealed, the materials used for its manufacture are safe and can be used in drinking water.

In the event that a cable needs to be connected to the pump, then first you will have to correctly determine its cross section and length, make a reliable and tight connection. Theoretically, this is not so difficult, but even if everything was done correctly and efficiently, during operation there may be some problems associated with the use of a protective sleeve, which can be filled or heat-shrinkable: it loses its tightness, which can lead to wet terminals closing.

A constantly heating cable can also become a problem, and the cause of this phenomenon is insufficiently crimped or soldered contacts. And then events can develop in a chain reaction: the cable heats up - the casing dries up, which leads to its depressurization - water comes into action and gets to the terminal box.

In the event that an error occurs when determining the cable cross-section, then a voltage drop simply occurs and, accordingly, the rotational speed decreases. When the voltage in the cable drops below 150 V, the built-in protection turns off the pump, and the consumer will have to guess what happened to the device and most often he will think that the engine just burned out. But to his joy, this is not so: it will be enough to change the cable and use the pump further.

Purchase and installation of Grundfos SQ pumps

If it is planned to use a Grundfos SQ series pump for the well, then you can buy it from Alfatep, if necessary, having received all the necessary advice from specialists. And even in the event that it is decided to purchase the device without a cable, our craftsmen will qualitatively and correctly perform all the necessary installation work, and, if necessary, install the equipment in a well or well.

You can get acquainted with the entire range of SQ pumps from Grundfos and make a purchase on the website of our online store. If there is a need to deliver equipment to the facility, then our customers have their own transport service at their disposal.

Grundfos SQ borehole pumps are designed for individual water supply, small water and sprinkler installations, irrigation hydraulic systems. These are compact (3-inch) multi-stage centrifugal pumps that can be installed in wells that are slightly larger than the pump. They are used for pumping clean, non-aggressive liquids that do not contain solid particles or fibers, with temperatures from 0 to +35 °C (sand content is allowed no more than 50 g/m 3).

Main applications:
- for supplying groundwater to water supply systems;
- for private houses;
– for small waterworks;
– for irrigation systems;
- for pumping water into tanks.

The working parts of the "SQ" pump are made of glass fiber reinforced polyamide (fiber content 30%). Thanks to the choice of such high-tech materials and the design of the pump, high efficiency is achieved with low energy consumption. Impellers with high-strength carbide bearing guarantee high wear resistance against abrasive media (sand) and significantly increase pump life. Starting the pump at very low back pressure can cause the impeller to move up along the axis of the pump shaft (“float”), which can lead to malfunction or even failure of the pump and motor. To protect against “floating”, the pump design has an upper thrust bearing.

The pumps are equipped with a single-phase (1×200-240 V, 50/60 Hz) Grundfos MS 3 submersible motor up to 1.85 kW, which is equipped with liquid lubricated plain bearings. The built-in electronic unit contains a frequency converter with soft start. The motor drive through the built-in frequency converter provides a constant speed of rotation. Soft start minimizes the risk of motor wear and prevents network overload during start-up. High efficiency is ensured by the use of permanent magnets in the electric motor. The motor is protected from overheating by a built-in temperature sensor, from overload by automatic speed control, and does not need additional protection. The pumps will be able to operate at reduced (up to 150 V) or increased (up to 315 V) electrical voltage in the network, surges and voltage drops.

The modular design of the pump and motor facilitates installation and maintenance. SQ borehole pumps can be operated in a vertical, horizontal or inclined position, but they must never be installed below the horizontal plane relative to the position of the electric motor. The pumps can be submerged up to 150 meters below the water level. For vertical installation, the pump must be completely submerged in water, for horizontal installation - at a level of 0.5 m below the dynamic water level. If there is a risk of contamination, the pump must be placed in a protective cover (accessory).

Main features and advantages of «SQ» borehole pumps:

• Groundwater supply for individual water supply
• Small pump diameter: 74mm
• Well diameter: from 76 mm
• Power: 1.02 to 2.54 kW
• Feed: up to 9 m 3 / h
• Hydrostatic head: up to 237 m
• Fluid temperature: 0 to +35 °C
• Possibility of pumping drinking water
• High efficiency
• Increased wear resistance (stainless steel wetted parts)
• Floating impellers with reverse axial displacement protection
• Ceramic bearings
• High-efficiency, single-phase, permanent magnet motor "MS 3" that does not require additional protection
• Low power consumption
• Constant speed due to integrated frequency converter
• Soft start function (protection against water hammer in the system and network overload)
• Built-in motor protection (overload, overheat, voltage surge)
• Built-in dry run protection
• Built-in check valve with spring
• Suction filter (blockage protection)
• High flow rate
• Pressure line connection: 1¼˝ (models SQ 1, SQ 2, SQ 3) and 1½˝ (models SQ 5, SQ 7)
• Cable length 1.5 m (other lengths on request)
• Ease of installation and maintenance
• Reliable operation in any position (vertical, horizontal, inclined)
• Small size and weight
• Reliability and durability
• Can be installed in an existing water supply system

Grundfos SQ 1-80- 3" multistage borehole pump for domestic water supply, pumping water from tanks, irrigation hydraulic systems and small waterworks. It is a surface pump with "floating" wheels, each with its own tungsten carbide/ceramic bearing.

Specifications Grundfos SQ 1–80

Power, kW - 0.73
Head, m of water Art. - 40-100
Max. head, m at Q=0 m3/hour - 108
Rated current, A - 230
Connection size, G - 1 1/4”
Length, mm - 826
Weight, kg - 5.05
Grundfos SQ 1-80 pump warranty - 2 years

Features of the Grundfos SQ 1–80 pump

Soft start, protection against reversal of axial displacement, overvoltage and undervoltage, protection against overload and overheating.
The single-phase permanent magnet motor provides optimum efficiency over a wide power range. The motor is supplied with a removable cable connector.

Application of the borehole pump Grundfos SQ 1–80

Grundfos SQ 1-80 pumps are designed for individual water supply, small waterworks, irrigation hydraulic systems and sprinkler installations.
The operation of the pump is provided for both long-term operation and intermittent operation. The pump is installed in well 3 (76 mm) manually, without the use of lifting devices.

Features of the borehole pump Grundfos SQ 1–80

Small size and weight of the pump (pump diameter 74mm): ease of installation, saving on drilling and well construction;
- Built-in check valve: reliable operation of the pump in any position - vertical, horizontal, inclined; - "Floating" impellers;
- Ceramic bearings;
- Pump parts made of stainless steel and composite materials: increased wear resistance in relation to sand, the possibility of pumping drinking water;
- The filter on absorption: protection against the large foreign inclusions which are contained in water;
- Electric motor with permanent magnets: high efficiency, increased starting torque, high power in a wide range of loads;
- Built-in dry run protection: no additional protection devices are required;
- Smooth running function: protection against water hammer in the system, built-in motor protection, protection against overheating and overload, the ability to work at low or high voltage, surges and drops in electrical current in the network.

Pumped media

The Grundfos SQ 1–80 borehole pump pumps non-aggressive liquids that do not contain solid particles or fibers, and the sand content in them does not exceed 50 g / m3

3 Inch Submersible Pump Series Grundfos SQ/SQE provides a wide range of performance, making it easy to find a model that suits your individual requirements.

The SQ/SQE pumps are compact, three-inch, multi-stage, centrifugal pumps that can be installed in even the narrowest well (minimum well diameter 76 mm). Built-in electronic components increase comfort and make the SQ/SQE pumps much easier to operate. They guarantee reliable water supply under any conditions.

These pumps are compact and easy to install, they are equipped with permanent magnet motors, provide high efficiency and head delivery up to 200 m.

If the SQE pump is connected to a Grundfos CU 301 control unit, this allows a constant pressure water supply.

Purpose

SQ/SQE pumps are suitable for both continuous and intermittent operation to suit a wide range of applications:

• Groundwater supply - private houses, small water supply systems, small irrigation systems;
• Pumping liquid into tanks;
• Increasing pressure;
• Environmental solutions – remedial pumping or sampling;
• Garages and gas stations.

Features and Benefits

• Dry running protection;
• High efficiency permanent magnet motor;
• Wear resistance of floating impellers;
• Protection against the ascent of impellers;
• High flow rate;
• Soft start reduces engine wear;
• Overvoltage and undervoltage protection;
• Overload protection;
• Overheat protection.

Additional features of SQE pumps

• Variable engine speed (with connection to CU 301);
• Connection to CU 301 for two-way communication.