Horizontal industrial pumps

SP series pump units belong to the class of rotary positive displacement pumps. Their operating process is determined by two main elements: a rotating rotor in the form of an external single-start helix made of high-strength steel, and a stationary stator in the form of an internal double-start helix consisting of a metal casing and an elastomer.

The pumping principle is based on the periodic displacement of a constant volume of medium from sealed chambers formed by the rotor and stator. As the rotor rotates, the cavity on the suction side increases, creating a vacuum. Under the action of the vacuum, the medium fills the resulting cavity. As rotation continues, the cavity closes, and the medium moves smoothly along the stator axis toward the discharge side. Thus, the pumped substance moves continuously from inlet to outlet.

The rotor is driven by a gear motor through a pin or cardan-type articulated coupling. The direction of rotation is indicated by an arrow on the nameplate.

Materials of construction are selected depending on operating conditions. Parts in contact with the pumped liquid are made of steel 20, 40Kh13, or 12Kh18N10T (grade to be agreed upon ordering). The type of elastomer for the stator is selected for the specific medium: food-grade, oil-and-gasoline-resistant, or abrasion-resistant. The wear rate of the contacting surfaces depends on the quantity, size, and hardness of inclusions in the pumped medium.

* The scheme of the gerotor pair

SP series pump units have a modular design and include the following main elements: a drive (gear motor or variable-speed motor), an adapter column, a gerotor pair (stator and rotor), a chamber with an articulated joint, a shaft sealing device, and inlet and outlet ports.

Main components and elements

Gerotor pair — the working element of the pump, consisting of a rotor and a stator. The rotor is an external single-start helix with a cross-section offset from the axis by the eccentricity value. The stator is made in the form of an internal double-start helix of elastomer, permanently bonded to a metal casing (sleeve).

Shaft — transmits torque from the drive to the rotor and is characterized by high wear resistance. At the customer’s request, a screw feeder can be installed at the inlet to improve filling of the working chamber.

Shaft seal can be provided in several versions depending on operating conditions:

• serviceable stuffing box;

• single mechanical seal;

• double mechanical seal (per API standard).

The choice of a specific seal type is determined by the properties of the pumped medium and the requirements of the technological process.

Articulated joint compensates for the eccentricity of rotor rotation. The joint has a sealed design and is filled with lubricant for its entire service life.

Inlet and outlet ports are made depending on the unit model and customer preferences:

• flanged port;

• quick-release “nut” type connection;

• rectangular inlet neck (for SP-H models).

Column serves as a frame for mounting the drive and chamber, ensuring alignment of all elements.

Drive (gear motor or variable-speed motor) provides the required rotation speed of the rotor and articulated joint.

Base frame (for horizontal SP-H pumps) ensures precise installation of all structural elements.

Composition of the pump unit

The basic configuration includes:

• screw pump;

• reduction gearbox;

• electric motor;

• base frame (for SP-H pumps) or mounting flange (for vertical SP-V pumps).

Scope of delivery

The standard scope of delivery includes:

• screw pump unit assembled;

• screw unit data sheet;

• operation manual;

• gearbox data sheet and operation manual (if applicable);

• electric motor data sheet (if applicable).

Optional equipment

Available on separate order:

• repair kit (spare parts);

• frequency converter;

• dry-run protection;

• overpressure protection unit.