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Asymmetric-tooth-shaped two-end spiral screw with involute force transmission side

A double-headed spiral and involute technology, applied in the direction of rotary piston pumps, rotary piston machines, rotary piston/swing piston pump components, etc., can solve the needs of torque transmission or unbalanced volume, transmission To solve the problems of poor performance and wear resistance, achieve the effects of low vibration and noise, balanced operation and reliable force transmission

Inactive Publication Date: 2016-06-22
TIANJIN HUAKE SCREW PUMP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is that the sealed tooth profile of the screw of the existing screw pump cannot meet the requirements of large torque transmission or unbalance, and the transmission and wear resistance are not good.

Method used

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  • Asymmetric-tooth-shaped two-end spiral screw with involute force transmission side
  • Asymmetric-tooth-shaped two-end spiral screw with involute force transmission side
  • Asymmetric-tooth-shaped two-end spiral screw with involute force transmission side

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides an asymmetrical double-ended helical screw that is approximately strictly sealed and has an involute force-transmitting tooth profile.

[0055] Such as Figure 5 As shown, the screw in this embodiment has a double-ended helix, and the helix at one end has an asymmetric tooth shape, and the two sides of the tooth shape are respectively the force transmission side bc and the sealing side ae, and the force transmission side bc is an involute tooth Shaped line, the sealing edge ae is an elongated epicycloid toothed line. The helix at the other end of the screw rod in this embodiment is a symmetrical tooth shape, and the two sides of the tooth shape are respectively the force transmission side b'c' and the sealing side b"c", and the force transmission side b'c' and the sealing side b' c' adopts the involute as the tooth profile.

[0056] A twin-screw used in a twin-screw pump, including the active screw S1 and the driven screw S with opposite helic...

Embodiment 2

[0067] On the basis of Example 1, in the screw of the present application, the involute tooth profile used on one side of the helix with asymmetric tooth shape, and the involute tooth used on both sides of the helix with symmetrical tooth shape Among the three involute tooth profile lines in total, at least one involute line has been smoothly corrected at the tooth root section. The smooth correction is a sealed shape, and the correction of the elongated epicycloid can be used, and other forms of correction can also be used. In this example, if Figure 11 As shown, the three involutes are all smooth corrected at the dedendum section, and are corrected by elongated epicycloids. In other embodiments, other combinations can also be used.

[0068] Such as Figure 11 As shown, the screw in this embodiment has a double-ended helix, and the helix at one end has an asymmetric tooth shape, and the two sides of the tooth shape are respectively the force transmission side bc and the se...

Embodiment 3

[0076] On the basis of Example 1, in the screw of the present application, one side of the helix with an asymmetrical tooth shape adopts an elongated epicycloid tooth profile, and the elongated epicycloid is corrected for wear resistance at the top section of the tooth , In this embodiment, cycloidal chamfering is used for correction, and in other embodiments, other forms of correction can also be used.

[0077] Such as Figure 17 As shown, the screw in this embodiment has a double-ended helix, and the helix at one end has an asymmetric tooth shape. Wire. In the sealing edge, the tooth top section is chamfered by an elongated epicycloid ff', and the tooth shape of the sealing edge is composed of an elongated epicycloid section af and an elongated epicycloid chamfering section ff'.

[0078] The main purpose of using the elongated epicycloid ff' chamfer to modify the tooth shape ae of the sealing edge is to improve the wear resistance of the sealing edge, resulting in a gap of...

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Abstract

The invention provides an asymmetric tooth-shaped two-end spiral screw with an involute force transmission side and belongs to the technical field of screw pumps. The screw has spirals on two ends; the spiral on one end is asymmetric-tooth-shaped; two tooth-shaped sides respectively comprise a force transmission side and a sealing side; the force transmission side takes involutes tooth-shaped lines; the sealing side takes extended epicycloids as tooth-shaped lines; the spiral on the other end of the screw is symmetric-tooth-shaped; two tooth-shaped sides respectively comprise a force transmission side and a sealing side; both the force transmission side and the sealing side take involutes as tooth-shaped lines. With perfect combination of two types of tooth-shaped lines including the involutes and the extended epicycloids, the two-screw pump with application of the screw is reliable in force transmission of a tooth-shaped surface of a screw rotator during operation, balanced in running, low in vibration noise and high in volumetric efficiency.

Description

technical field [0001] The invention relates to the technical field of screw pumps, in particular to an asymmetric tooth-shaped double-ended screw screw with involute force transmission sides. Background technique [0002] The twin-screw pump is a sealed chamber with a constant volume formed between the screw sleeve and the pump body or bushing on the main and driven shafts, and the medium is sent to the middle of the pump body with the rotation of the screw shaft, and the two meet together. Finally, it is delivered to the outlet of the pump, so as to achieve the purpose of pump delivery. [0003] In order to ensure that the twin-screw pump has a higher volumetric efficiency when conveying low-viscosity media, it is more advantageous to use a strictly sealed profile or an approximately strictly sealed profile for the screw helical profile of the pump than to use a non-sealed profile. [0004] Existing twin-screw pumps use the following two types of screws with strictly seal...

Claims

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Application Information

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IPC IPC(8): F04C2/16F04C15/00
CPCF04C2/16F04C15/0003
Inventor 周轩宇
Owner TIANJIN HUAKE SCREW PUMP TECH CO LTD
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