Double-end spiral screw rod and double-screw pump and dry vacuum screw pump adopting screw rod

A double-headed screw and screw technology, which is applied to the parts of the pumping device for elastic fluid, the pump parts of the rotary piston type/oscillating piston type, and the rotary piston type pump, etc. Vibration and other problems, to achieve high volumetric efficiency, stable and reliable operation

Active Publication Date: 2018-08-24
天津市道尔机械技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the dynamic unbalance of the screw of this profile cannot be zero, and the vibration of the screw rotor is large during operation, which affects the life of the pump bearing. Therefore, it is necessary to use the de-weighting method to carry out the dynamic balance of the screw rotor, and the processing workload is large.
Moreover, due to drilling holes on the outer cylindrical surface of the screw to remove weight, there are holes on the outer cylindrical surface, which limits the use of the pump in special medium conditions.

Method used

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  • Double-end spiral screw rod and double-screw pump and dry vacuum screw pump adopting screw rod
  • Double-end spiral screw rod and double-screw pump and dry vacuum screw pump adopting screw rod
  • Double-end spiral screw rod and double-screw pump and dry vacuum screw pump adopting screw rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, there is provided a kind of asymmetrical double-headed helical screw which is used for twin-screw pump with strict seal and tooth shape of Aprocycloid 4 force transmission side, including active screw S 1 with driven screw S 2 . The helixes of the main and slave screws adopt exactly the same tooth profile, and the tooth profile of this embodiment is as follows: figure 2 shown, and are double-ended helices.

[0039] The tooth shape on both sides of the helix of one of the double-ended spirals adopts two asymmetrical tooth shape curves. The force transmission side (bc section) on one side adopts a cycloid 4 tooth shape curve, and the other The sealing edge (section ae) on the side adopts the tooth profile curve of elongated epicycloid 1; the tooth profile b′c′, b″ on both sides of the spiral (force transmission side and sealing side) of the other head of the double-ended spiral c " all adopt the cycloid 4 as the tooth profile curve.

[0040] Adopt...

Embodiment 2

[0052] On the basis of Example 1, the design of the extended epicycloid 1 addendum chamfer correction is usually adopted in the engineering practice of the sealing surface profile line, such as Figure 10 As shown, the tooth top section of the elongated epicycloid 1 adopts ff' chamfering, and the tooth shape of the sealing edge is composed of two sections: the elongated epicycloid section 1 (af section) and the elongated epicycloid 1 (ff' section). The main purpose of using ff′ chamfer to correct the tooth shape ae of the sealing edge is to improve the wear resistance of the sealing edge and cause a gap of the sealing line on the tooth top of the sealing edge helicoid.

[0053] Such as Figure 11 , 12 , 13, 14, and 15, whether it is the active screw S 1 A 1 , A' 1 Slot or follower screw S 2 A 2 , A' 2 The sealing lines on the helical surfaces on both sides of the grooves are continuous within the entire helical surface from the root circle to the addendum circle, withou...

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Abstract

The invention provides a double-end asymmetrical tooth-shaped screw rod, and a double-screw pump and a dry vacuum screw pump designed and manufactured by adopting the screw rod. In the double-end screw rod, one tooth of the double-end screw rod is an asymmetric tooth, and the other tooth is a symmetric tooth; a tooth-shaped molded ling of a spiral surface of a sealing edge of the asymmetric toothis an extension outer swing line; a tooth-shaped molded line of a force transfer edge is Abao swing line; and tooth-shaped molded lines of tooth side spiral surfaces of the sealing edge and the forcetransfer edge of the symmetric tooth are Abao swing lines. The Abao swing lines consist of extension outer swing lines, Archimedes envelope lines and Archimedes lines. The screw rod with the tooth-shaped molded line is used for the double-screw pump, can achieve strict sealing, can guarantee a screw rotor to reach a dynamic unbalance quantity of zero (similar to zero), is suitable for high operation speed, guarantees use of the manufactured double-screw pump, is high in capacity efficiency under high pressure, and can guarantee stable and reliable operation of the double-screw pump under highrotating speed.

Description

technical field [0001] The invention relates to a screw used for a twin-screw pump, in particular to a helical tooth profile design technology applied to the core part screw of a dry vacuum screw pump. Background technique [0002] In the prior art, in order to ensure that the twin-screw pump has a higher volumetric efficiency when transporting the medium, especially when the dry vacuum screw pump pumps the gas medium, the screw helical tooth profile of the pump adopts a strictly sealed profile (or approximately strictly sealed profile) has advantages over the use of non-sealed profiles. [0003] Existing twin-screw pumps and dry-type vacuum screw pumps adopt strictly sealed or nearly strictly sealed helical tooth profile screws with the following characteristics and disadvantages: a strictly sealed single-head asymmetrical tooth profile screw, its sealing edge ae is an elongated epicycloid, and the force-transmitting side bc is composed of the Archimedes line jc and its en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/16F04C25/02F04C29/00
CPCF04C18/16F04C25/02F04C29/00F04C2240/20
Inventor 周轩宇
Owner 天津市道尔机械技术有限公司
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