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Welded thin-wall hollow rotor for screw pump and processing method and application thereof

A technology of hollow rotor and processing method, which is applied in the direction of pumps, pump components, rotary piston pumps, etc., can solve the problems of high power of geared motors, heavy weight of solid screws, and high operating noise, so as to reduce vibration intensity and operating costs The effect of low cost and high production efficiency

Inactive Publication Date: 2021-03-12
NETZSCH LANZHOU PUMPS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-screw pump has been in existence for more than 100 years. There are many designs for the evolution and replacement of the stator and rotor, but the conventional rotors account for 90% of the single-headed ones that are processed from metal bars on special custom-made metal cutting machines. Eccentric screw, the solid screw has a large weight and a long processing cycle; the matching geared motor has high power and high energy consumption; the moment of inertia is large, the vibration intensity is strong during use, and the running noise is large

Method used

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  • Welded thin-wall hollow rotor for screw pump and processing method and application thereof
  • Welded thin-wall hollow rotor for screw pump and processing method and application thereof
  • Welded thin-wall hollow rotor for screw pump and processing method and application thereof

Examples

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Effect test

Embodiment 1

[0042] A method for processing a welded thin-walled hollow rotor for a screw pump, specifically comprising the following steps:

[0043] Step (1). Select a seamless steel pipe with a diameter of 168*12 mm, and process the outer circle to a diameter of 166*10 mm. The process requires a surface roughness of Ra1.6-3.2. The twist-shaped metal special-shaped spiral tube is extruded by the extrusion die on the machine, and the pitch and helical direction are matched with the parameters of the forming helical surface of the inner cavity of the stator used with it;

[0044] Step (2). Weld the matching rotor joints and plug baffles on both ends of the metal special-shaped spiral tube processed in step (1);

[0045] Step (3). Polish the outer surface of the metal special-shaped spiral tube (rotor screw), and the surface roughness reaches Ra1.6-3.2, that is, a welded thin-walled hollow rotor is obtained. The total length of the rotor is 1680 mm (including the length of the rotor screw i...

Embodiment 2

[0047] A method for processing a welded thin-walled hollow rotor for a screw pump, specifically comprising the following steps:

[0048] Step (1). Select a seamless steel pipe with a diameter of 140*10 mm and a surface roughness of Ra1.6-3.2, and extrude the seamless steel pipe through an extrusion die on a press to form a twist-shaped metal special-shaped spiral pipe. And the pitch and the helical direction are all matched with the parameters of the forming helical curved surface of the inner cavity of the stator used in conjunction with it. Because the seamless steel pipe used in the welded thin-walled hollow rotor of this specification happens to have a commercial specification of 140*10mm, so there is no need to do surface cutting, and it can be used directly by extrusion.

[0049] Step (2). Weld the matching rotor joints and plug baffles on both ends of the metal special-shaped spiral tube processed in step (1);

[0050] Step (3). Polish the outer surface of the metal sp...

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Abstract

The invention provides a welded thin-wall hollow rotor for a screw pump and a processing method and application thereof. The rotor is a hollow rotor with the two right-handed ends and the two blockedends. A seamless steel pipe is selected, subjected to cylindrical turning till the surface roughness is Ra1.6-3.2, and then extruded on a press to form a twisted metal special-shaped spiral pipe, andthe screw pitch and the spiral direction are matched with those of an inner cavity of a stator paired with the rotor; a rotor joint is welded at one end of the metal special-shaped spiral pipe, and aplug baffle plate is welded at the other end of the metal special-shaped spiral pipe; and the outer surface of the metal special-shaped spiral pipe is polished till the surface roughness reaches Ra1.6-3.2, and the thin-wall hollow rotor is obtained. Compared with a common solid rotor, the welded thin-wall hollow rotor is light in weight, the machining period is shortened, the production efficiencyis improved, the power of a matched gear motor can be reduced by one to two levels, and therefore the structure is compact, the initial investment is small, in the operation process, the rotational inertia is reduced, the vibration intensity of a pump is reduced, the operation noise of the pump is lowered, and high cost performance is achieved.

Description

technical field [0001] The invention relates to a screw pump, in particular to a welded thin-walled hollow rotor for a screw pump, a processing method and an application thereof. Background technique [0002] The main working components of the single-screw pump are composed of a pair of parts called the stator and the rotor: the stator of the single-screw pump is molded by a rubber injection molding machine that is heated to a certain temperature and has fluidity after hot-melting in a specific In the metal hollow cylindrical mold, the inner wall is made of rubber materials with different thicknesses, and the outer wall is made of metal carbon steel pipes with equal thickness. The working principle of the single-screw pump is that through the interference fit between the metal rotor similar to the single thread and the rubber stator similar to the double-ended nut, the media in the respective sealed cavities spirally wound in the 360-degree direction, along with the rotation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/107B23P15/00
CPCF04C2/107B23P15/00F04C2240/20F04C2250/20
Inventor 万三
Owner NETZSCH LANZHOU PUMPS CO LTD
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