Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Screw vacuum pump

A screw vacuum pump and screw technology, applied in pumps, rotary piston pumps, rotary piston machinery, etc., can solve the problems of low compression and reduced sealing area of ​​screw vacuum pumps, and improve the sealing effect, compression ratio, and sealing effect Good results

Active Publication Date: 2017-02-22
ZHEJIANG CHUANGWEI VACUUM EQUIP CO LTD
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The end surface profile of the screw with this structure results in a narrower tooth top sealing zone of the screw, which reduces the sealing area between the screw and the pump body, and causes the gas to pass between the screw tooth top sealing zone and the inner wall of the pump, resulting in The compression ratio of the screw vacuum pump is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Screw vacuum pump
  • Screw vacuum pump
  • Screw vacuum pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1 to Figure 3 As shown, the screw vacuum pump includes two screws 1 with the same end profile and opposite rotation direction. The end profile of the screw 1 is composed of a section of addendum arc section 2, a section of cycloid section 3, and a section of dedendum circle section 4, which are sequentially connected. A section of cycloidal segment 5 and a segment of cycloidal segment 6 are composed, the segment of cycloidal segment 5 is a concave arc, the transition between segment of cycloidal segment 5 and root circle segment 4 is smooth, segment of cycloidal segment 5 and segment of node cycloid segment 6 are mutually Conjugate, the nodal cycloid segment 6 is an outwardly convex arc, the intersection of the nodal cycloid segment 5 and the nodal cycloid segment 6 forms a sharp angle 17, and the intersection of the nodal cycloid segment 6 and the addendum arc segment 2 forms a sharp angle 2 8; The equation for segment 5 of the cycloid is:

[0028] ...

Embodiment 2

[0038] The structure and principle of this embodiment are basically the same as that of Embodiment 1, the difference lies in: the circular arc transition section is formed by rounding between the cycloid segment and the addendum arc segment, and the radius value range of the arc transition segment is: 0 ~0.2mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a screw vacuum pump, and belongs to the technical field of vacuum pumps. The screw vacuum pump solves technical problems that a current screw vacuum pump has a low compression ratio and the like. The screw vacuum pump comprises two screws which have identical end face molded lines and adverse directions of turning, the end face molded lines of the screws are composed of a length of addendum arc passage segment, a length of cycloid segment, a length of dedendum circle segment, a length of point cycloid segment and a length of node cycloid segment, wherein, the length of addendum arc passage segment, the length of cycloid segment, the length of dedendum circle segment, the length of point cycloid segment and the length of node cycloid segment are sequentially connected, the point cycloid segment is an inward concave arc, smooth transition is achieved between the point cycloid segment and the dedendum circle segment, the point cycloid segment and the node cycloid segment are conjugations with each other, the node cycloid segment is an outward concave arc, the intersection between the point cycloid segment and the node cycloid segment forms a first sharp corner, and the intersection between the node cycloid segment and the addendum arc segment forms a second sharp corner. The screw vacuum pump has the advantage of increasing the compression ratio.

Description

technical field [0001] The invention belongs to the technical field of vacuum pumps and relates to a screw vacuum pump. Background technique [0002] The screw vacuum pump is an air extraction device that uses a pair of screws to perform synchronous high-speed reverse rotation in the pump casing to generate air suction and exhaust. It is widely used in major domestic pharmaceutical and chemical companies in dusty gas occasions. [0003] The key technology of the screw vacuum pump is the intermeshing screws. The key of the intermeshing screws is the end profile. The end profile directly affects the performance of the screw vacuum pump, such as sealing, efficiency, and area utilization coefficient. It also determines the processing and manufacturing of the pump. cost. [0004] A screw assembly of a screw vacuum pump currently disclosed in Chinese patent literature [authorized announcement number CN104019034] includes two screws with the same end profile and opposite rotation...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F04C18/16F04C25/02
CPCF04C18/16F04C25/02
Inventor 柯建汝
Owner ZHEJIANG CHUANGWEI VACUUM EQUIP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com