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Sealed single-head spiral screw and double screws thereof

A helical screw and screw technology, which is applied in the field of screw pumps, can solve problems such as gaps in meshing lines, low pump volume ratio, and incomplete sealing of tooth profile lines, so as to facilitate manufacturing and processing, reduce leakage, and increase volumetric efficiency Effect

Active Publication Date: 2016-04-13
TIANJIN HUAKE SCREW PUMP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is that the single-head helical screw of the existing screw pump cannot be completely sealed, and there is a gap in the meshing line, so that the pump cannot meet the sealing requirements, and the volume ratio of the pump is not high

Method used

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  • Sealed single-head spiral screw and double screws thereof
  • Sealed single-head spiral screw and double screws thereof
  • Sealed single-head spiral screw and double screws thereof

Examples

Experimental program
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Embodiment 1

[0039] In this embodiment, a sealed single-head helical screw is provided. like Figure 5 As shown, the screw rod in this embodiment is a single-headed screw, and the two sides of its tooth shape are the force transmission side abcd and the sealing side ef respectively, and the force transmission side abcd is divided into three sections ab, bc, and cd. Among them, ab is the elongated epicycloid tooth profile, bc is the involute tooth profile, cd is the short epicycloid tooth profile, and the sealing edge ef is the elongated epicycloid tooth profile.

[0040] This embodiment also provides a twin-screw pump, the active screw S 1 and driven screw S 2 The tooth shape is the same, and they are all the above-mentioned single-head helical screws. Active screw S 1 The helical direction of the driven screw S 2 The helices have different directions of rotation, if one of them is right-handed, the other is left-handed. In the following logos, the subscript 1 means that it belongs t...

Embodiment 2

[0052] On the basis of Example 1, the screw rod of this example is a single-headed screw, and the side of the sealing edge adopts the elongated epicycloid 1 as the tooth profile, and further, the elongated epicycloid 1 is carried out on the tooth top section. Wear correction. As an implementation, in this embodiment, the wear correction adopts cycloid chamfer correction, such as Figure 12 As shown, in this embodiment, the extended epicycloid gg' chamfering is adopted, and the tooth profile of the sealing edge is composed of two sections, the elongated epicycloid segment eg and the extended epicycloid chamfer segment gg'. In other embodiments, other forms of modification may also be employed.

[0053] The main purpose of using the elongated epicycloid gg' chamfer to modify the tooth profile line ef of the sealing edge is to improve the wear resistance of the sealing edge.

[0054] In this embodiment, the force transmission principle of the screw is: the tooth profile of the ...

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Abstract

The invention provides a sealed single-head spiral screw and double screws thereof and belongs to the technical field of screw pumps. The spiral of the single-head spiral screw is in an asymmetric tooth shape. A force transmission edge and a sealing edge are arranged on the two sides of the tooth shape respectively. The tooth-shaped profile of the sealing edge is an elongated epicycloid. The tooth-shaped profile of the force transmission edge is a combined profile of an elongated epicycloid, an involute and a curtate epicycloid. According to the tooth-shaped profile of the single-head spiral screw, the sealing edge on one side is the elongated epicycloid, the force transmission edge on the other side is combination of the elongated epicycloid, the involute and the curtate epicycloid, the engagement lines are continuous, and no gap exists between the engagement lines. According to a double-screw pump or a double-screw type vacuum pump with the sealed singe-head spiral screws, the tight sealing effect can be achieved, and torque is transmitted to the tooth-shaped profile of the force transmission edge of the involute segment of the drive screw from the tooth-shaped profile of the force transmission edge of the involute of the driven screw.

Description

technical field [0001] The invention relates to the technical field of screw pumps, in particular to a single-head helical screw used in the sealing of a twin-screw pump conveying machine or a twin-screw vacuum pump and a twin screw using the single-head helical screw. Background technique [0002] Existing twin-screw pumps or twin-screw vacuum pumps commonly use the tooth-shaped profile of the single-head helical screw. One tooth side helicoid adopts an elongated epicycloid, and the other side adopts an involute. The meshing line and extension of the involute The meshing line of the long epicycloid is discontinuous. When the driving screw and the driven screw of the twin-screw pump mesh, there is a gap between them. During the operation of the pump, the medium in the discharge chamber will leak from these gaps to the inlet. in the mouth. When the twin-screw pump or twin-screw vacuum pump adopts this tooth profile curve, the meshing line of the screw cannot effectively form...

Claims

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Application Information

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IPC IPC(8): F04C2/16F04C18/16
CPCF04C2/16F04C18/16
Inventor 陈睿何贤举
Owner TIANJIN HUAKE SCREW PUMP TECH CO LTD
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