ES2648797T3 - Self-priming pump unit - Google Patents

Abstract

Self-priming pump unit (1) which is a series connection of a liquid ring pump, which functions as a rotary displacement pump (20), and a normal suction centrifugal pump (2), presenting the centrifugal pump (2) a shaft (8) rotatably mounted with an impeller (4) in a housing (2.1 / 2.2) provided with an inlet hole (2.1b) and a pressure pipe (5), the housing being composed, viewed in the direction of flow, of a front casing part (2.1) and a rear casing part (2.2), an inner space (20.3) being joined, bounded by a casing lining (20.1) of the displacement pump (20), to an inner space (2.1c) of the centrifugal pump (2) located on the suction side by means of the inlet hole (2.1b) and a transport screw (21) being arranged in the casing lining (20.1) which is fixed on the shaft (8) that meshes through the impeller (4) and in the car lining house (20.1), and a return duct (9) being provided that directly or indirectly joins an area of the centrifugal pump (2), located on the pressure side, to the interior space (20.3), characterized in that the duct return (9) on the side of the centrifugal pump is connected by a first connection point (9a) to an interior space (3; 3 *, 3 **) located on the pressure side inside the housing (2.1 / 2.2), which, seen in the flow direction, is next to the impeller (4), because the first connection point (9a ) flows from an annular surface (2.2b) that is radial or almost radially oriented and delimits the interior space (3; 3 *, 3 **), located on the pressure side in the area of an annular channel ( 3 *, 3 **), and is part of the rear housing part (2.2) and delimits the annular channel (3 *; 3 **) in axial direction as a rear wall area located on the front side, and why the annular channel (3 *; 3 **) is an integral part of the interior space (3; 3 *, 3 **) located on the pressure side.

Description

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Four. Five

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25 o is a liquid sensor at a point between the suction and pressure conduit 24, 25. Another alternative is to use as a signal generator 23 a power sensor that detects the driving power of the motor 6 of the pump unit one.

Reference list of abbreviations used

1 Unit of self-priming pumps

2 Centrifugal pump (normal suction)

2.1 / 2.2 Housing

2.1 Front housing part 2.1a External annular channel housing wall 2.1b Inlet hole 2.1c Interior space located on the suction side

2.2 Rear housing part 2.2a Internal annular channel housing wall 2.2b Radial or almost radially oriented annular surface

3 Interior space located on the pressure side 3 * Ring channel

3**

Helical annular channel 3a Annular space without blades

4 Rodete

5 Pressure pipe 5a Conical extension 5b Connection pipe

6 Motor 7 Fixing flange

8 Axis 8a Core 8b Shaft extension

9 Return duct (carrying liquid) 9a First connection point 9b Second connection point

20 Rotary displacement pump (liquid ring pump)

20.1 Shell coating

20.2 Housing cover 20.2a Suction pipe

20.3 Interior space

21 Transport auger screw 22 Shut-off valve 23 Signal generator 24 Suction line 25 Pressure line 26 Thread 27 Control line

a1 Rotation axis of the pump unit 1 a2 Axial symmetry axis of the housing cladding 20.1 e Eccentricity (vertical) n Direction of rotation ri Local radius of curvature

E Layout plan Ra External radio

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Claims (1)

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