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Multi-blade roots pump universal profile

A general-purpose, cycloidal technology, applied in the direction of pumps, pump components, rotary piston pumps, etc., can solve the problems of less profiled rotors, impossibility to use, and limited profiled lines, etc., to increase the pumping rate, increase the air volume, The effect of increasing the area utilization factor

Inactive Publication Date: 2018-02-23
SHANDONG BOZHONG VACUUM EQUIP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this ratio is greater than a certain extreme value, the two traditional profiles of the outer arc and its conjugate curve or the inner arc and its conjugate curve cannot be used, and the profile design is limited
At present, two-lobe rotor profiles or three-lobe rotor profiles are commonly used, but there are fewer rotor profiles involving four or more lobes.

Method used

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  • Multi-blade roots pump universal profile
  • Multi-blade roots pump universal profile
  • Multi-blade roots pump universal profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] When n=2, such as image 3 It is a schematic diagram of the meshing state of the two rotors of the general line of the two-lobe Roots pump, O 1 and O 2 are the centers of the two rotors, respectively.

Embodiment 2

[0051] When n=3, such as Figure 4 It is a schematic diagram of the meshing state of the two rotors of the general type line of the three-lobe Roots pump, O 1 and O 2 are the centers of the two rotors, respectively.

Embodiment 3

[0053] When n=4, such as Figure 5 It is a schematic diagram of the meshing state of the two rotors of the general-purpose line of the four-lobe Roots pump, O 1 and O 2 are the centers of the two rotors, respectively.

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Abstract

The invention relates to a general profile of a multi-lobe Roots pump, in particular to a rotor profile of a multi-lobe Roots pump suitable for a Roots blower and a Roots vacuum pump. 2. n is a positive integer. The rotor body is composed of a valley shape and a peak shape connected in sequence. The profile line from the lowest point of any valley shape to the highest point of its adjacent peak shape is sequentially composed of the root arc AB section, the cycloid BC section and The conjugate curve CD segment of the root arc is composed. The radius ratio Rm / R of the top circle radius Rm to the pitch circle radius R of the general profile of the multi-lobe Roots pump of the present invention exceeds the extreme value, the area utilization coefficient of the rotor is high, and the air volume and air extraction rate are large.

Description

technical field [0001] The invention relates to a general profile of a multi-lobe Roots pump, in particular to a rotor profile of a multi-lobe Roots pump suitable for a Roots blower and a Roots vacuum pump. Background technique [0002] The rotor profile of Roots blower is usually involute type and arc type. Compared with the involute rotor, the circular arc rotor of the Roots blower has the advantages of low noise and high efficiency. Currently commonly used are the outer arc and its conjugate curve type or the inner arc and its conjugate curve type. When designing these two rotors, the radius ratio Rm / R of the rotor top circle radius Rm to the pitch circle radius R is a very important parameter, which determines the air volume of the Roots blower and the pumping rate of the Roots vacuum pump. The larger the ratio, the thinner and taller the rotor, the higher the area utilization coefficient of the rotor, and the greater the air volume and suction rate. However, if this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/12F04C29/00
CPCF04C18/126F04C29/00
Inventor 张东庆陈宗武雷春栋徐元蕾邱延亮
Owner SHANDONG BOZHONG VACUUM EQUIP LIMITED