Multi-stage dry Roots vacuum pump

Abstract

The invention is a multi-stage dry Roots vacuum pump. The pump body (1) includes a cooling water spacer (1.1) wrapped in the outer layer, and the inner chamber of the pump body (1) is divided into a plurality of mutually independent Each pump cavity includes an inner cavity (1.2) and an outer cavity (1.3) between the inner cavity (1.2) and the cooling water spacer (1.1), and the inner cavity (1.2) of the adjacent pump cavity ) communicates with the outer cavity (1.3); the pump body (1) is pierced with a shaft (6), on which there are multiple pairs of rotors (5), and each pump cavity is provided with a pair of rotors (5) , the rotor (5) includes a driving rotor (5.1) and a driven rotor (5.2) that mesh with each other and are located in the inner cavity (1.2), and the driving rotor (5.1) and the driven rotor (5.2) are respectively sleeved on the driving shaft ( 6.1) and on the driven shaft (6.2). The invention discloses a multi-stage dry Roots vacuum pump, which has the advantages of simple structure, convenient use, low failure rate and the ability to meet higher vacuum degree requirements.

Description

technical field [0001] The present invention relates to a vacuum pump, in particular to a multi-stage dry Roots vacuum pump, which has no oil pollution, no waste gas, no waste liquid discharge, and can achieve a higher vacuum degree and higher multi-stage dry Roots vacuum pump. It belongs to the technical field of vacuum pumps. Background technique [0002] At present, in the field of vacuum applications, there are still a large number of various types of vacuum pumps that use high energy consumption and high pollution emissions, such as oil-sealed vacuum pumps such as rotary vane vacuum pumps and slide valve vacuum pumps that use a lot of oil consumption and exhaust emissions, and high energy consumption. There are a lot of waste liquid, Liquid ring vacuum pumps for exhaust gas discharge, these vacuum pumps are no longer suitable for the current national requirements for energy saving, environmental protection and low emissions; [0003] At the same time, conventional Root...

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Problems solved by technology

[0002] At present, in the field of vacuum applications, there are still a large number of various types of vacuum pumps that use high energy consumption and high pollution emissions, such as oil-sealed vacuum pumps such as rotary vane vacuum pumps and slide valve vacuum pumps that use a lot of oil consumption and exhaust emissions, and high energy consumption. There are a lot of waste liquid, Liquid ring vacuum pumps for exhaust gas discharge, these vacuum pumps are no longer suitable for the current national requirements for energy saving, environmental protection and low emissions;

[0003] At the same time, conventional Roots vacuum pumps are all single-stage Roots vacuum pumps, and the vacuum degree that a single-stage Roots vacuum pump can achieve is limited. Two single-stage Roots vacuum pumps are connected in series. This form of multi-stage Roots vacuum pump has multiple motors and multiple sets of cooling equipment. The multi-stage Roots vacuum pump made in this way has complex structure and volume. Huge defects, and the control is complex, the failure rate is relatively high

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