Three-screw pump

A three-screw pump and screw technology, which is applied to pumps, pump components, rotary piston pumps, etc., can solve the problems of large gap between the active screw and driven screw, low volumetric efficiency of the three-screw pump, and decreased volumetric efficiency, and achieve flow Stable, avoid deformation of processing and assembly, optimize the effect of meshing seal

Active Publication Date: 2015-06-17
溧阳市超强链条制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The driven screw of the traditional three-screw pump is thin and long, and its rigidity is poor. It will inevitably produce deflection deformation during processing and operation, which will affect the meshing gap between it and the helical surface of the driving screw, and also affect the helix of the driven screw. Clearance between the outer circle of the face and the inner hole of the bushing
If the gap is too small, it is easy to cause the product to "hold the shaft" or even get stuck during operation; if the gap is too large, the volumetric efficiency of the pump will decrease
Therefore, the output pressure of the traditional three-screw pump is low and the flow rate is small
At the same time, if Image 6 , the tooth shape of the three-screw pump is generally composed of point meshing cycloids, the flow resistance of the fluid is large, and the gap between the driving screw and the driven screw is large, resulting in more leakage, and the volumetric efficiency of the three-screw pump is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0022] refer to figure 1 , the three-screw pump of the present invention includes a pump body 3, a driving screw 4 and two driven screws 5, a bushing 6 is axially installed between the pump body 3 and the driven screw 5, and the driving screw 4 and the driven screw 5 engage Located in the bushing 6, the two ends of the pump body 3 are respectively equipped with a front cover 9 and a rear cover 1, a gasket is provided between the pump body 3 and the rear cover 1, and the pump body 3 and the rear cover 1 are connected by screws, and the active The screw 4 is installed on the front cover 9 through the bearing 10, an O-ring 8 is provided between the pump body 3 and the front cover 9, the pump body 3 and the front cover 9 are connected by a fixing piece 7, and the active screw 4 is installed on the front cover 9 There is a retaining ring 11, a seal 12 is arranged between the retaining ring 11 and the bearing 10, the driving end of the driving screw 4 extends to the outside of the ...

no. 2 example

[0029] Improvement is made on the basis of the first embodiment, and the Archimedes spiral is replaced by the Archimedes-like spiral, and the polar radius equation of the Archimedes-like spiral is ρ=α×f(t)+β , where the equation ρ=α×f(t)+β is continuous and the first-order derivative is continuous, that is, dρ / dt=0 at the two endpoints of the starting point and the ending point, so a curve satisfying the condition can be selected, where α and β is a constant.

[0030] The number of screw heads of the active screw 4 is 2n (n=1, 2, 3...), the tooth profile of each screw is the same, and is evenly distributed along the circumference, and the tooth profile of one screw is formed by the arc line a1b1, Archimedes-like The spiral b1c1, the dedendum arc line c1d1, the Archimedes-like spiral d1e1, the arc line e1f1, and the addendum arc line f1g1 are sequentially connected, among which, the dedendum arc line c1d1 and the addendum arc line f1g1 is the arc line with the center O1 of the...

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Abstract

The invention relates to a three-screw pump which comprises a pump body, a driving screw rod and two driven screw rods, wherein a bushing is axially mounted between the pump body and the driven screw rods; the driving screw rod and the driven screw rod are meshed inside the bushing; the bushing is formed by connecting a first bushing, a second bushing and a third bushing; the tooth shapes of the screw rods adopt an Achimedean spiral or a similar Achimedean spiral. The bushing adopts a sectional mode, so that the processing precision of screw rod matching holes of each section of the bushing is improved; as the tooth shapes of the screw rods adopt the Achimedean spiral or the similar Achimedean spiral, flowing obstruction or fluid pulsation can be reduced, and the volume efficiency of the three-screw pump can be improved.

Description

technical field [0001] The invention relates to a three-screw pump. Background technique [0002] At present, three-screw pumps have been widely used in various fields, such as metallurgy, machinery, electric power, shipbuilding and other industries. The driven screw of the traditional three-screw pump is thin and long, and its rigidity is poor. It will inevitably produce deflection deformation during processing and operation, which will affect the meshing gap between it and the helical surface of the driving screw, and also affect the helix of the driven screw. The gap between the outer circle of the face and the inner bore of the bushing. If the gap is too small, it is easy to cause the product to "hold the shaft" or even get stuck during operation; if the gap is too large, the volumetric efficiency of the pump will decrease. Therefore, the traditional three-screw pump has a lower output pressure and a smaller flow rate. At the same time, if Figure 6 , The tooth shape ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/16F04C15/00
CPCF04C2/082F04C2/165F04C15/0003F04C2240/20
Inventor 蒋俊美蒋俊波蒋阿生
Owner 溧阳市超强链条制造有限公司
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