HD type vacuum pump

Introduction to Vacuum Pump Products

There are many manufacturers of vacuum pumps in our country, and the annual sales revenue of all vacuum pumps is about 150 million yuan, which is only equivalent to the annual sales revenue of a vacuum pump company in the United States. Through the analysis of the vacuum pump market, we can see that the market and application areas of various vacuum pumps are constantly changing and developing. China's vacuum pump manufacturing industry has a long history and strong foundation. Domestic vacuum pumps have been applied and verified in various fields. Some pumps are also exported abroad and have been recognized and praised by foreign users. It can be said that China's vacuum pump manufacturing industry still has huge development space in domestic and foreign markets.

Introduction to Vacuum Pump Products

Product Features

(1) Has a larger pumping speed within a wider pressure range;

(2) The rotor has good geometric symmetry, resulting in low vibration and smooth operation. There are clearances between rotors and between rotors and shells, which do not require lubrication and have low friction losses, greatly reducing driving power and achieving higher speeds;

(3) The pump chamber does not require oil sealing and lubrication, which can reduce the pollution of oil vapor to the vacuum system;

(4) There is no compression in the pump chamber and no exhaust valve. Simple and compact structure, insensitive to dust and water vapor in the extracted gas;

(5) Low compression ratio results in poor hydrogen extraction efficiency;

(6) The surface of the rotor is a complex curved cylindrical surface, which is difficult to process and inspect.

structure

(1) Overall structural type of pump

The arrangement structure of the pump body of a vacuum pump determines the overall structure of the pump.

The horizontal setting of the inlet and outlet of the vertical structure makes assembly and connection of pipelines relatively convenient. But the center of gravity of the pump is relatively high, and its stability is poor during high-speed operation, so this type is mostly used for small pumps.

The inlet of the horizontal pump is on top and the outlet is on the bottom. Sometimes, in order to facilitate the installation and connection of vacuum system pipelines, the exhaust port can be connected horizontally, that is, the inlet and outlet directions are perpendicular to each other. At this point, the exhaust port can open from both left and right directions, except for one end connected to the exhaust pipe, the other end can be blocked or connected to a bypass valve. This pump structure has a low center of gravity and good stability during high-speed operation. This structure is commonly used in large and medium-sized pumps.

The two rotor shafts of the pump are installed perpendicular to the horizontal plane. This structure is easy to control the assembly clearance, the rotor assembly is convenient, and the pump occupies a small area. But the pump has a high center of gravity and the gears are difficult to disassemble, and the lubrication mechanism is relatively complex.

(2) The transmission mode of the pump

The two rotors of a vacuum pump operate in relative synchronization through a pair of high-precision gears. The active shaft is connected to the motor through a coupling. There are mainly two types of transmission structure arrangements: one is to place the motor and gear on the same side of the rotor as shown in the figure. The driven rotor is directly transmitted and driven by the motor end gear, so that the twisting deformation of the active rotor shaft is small, and the gap between the two rotors will not change due to the large twisting deformation of the active shaft, thus making the gap between the rotors uniform during operation. The biggest disadvantage of this transmission method is that: a. there are three bearings on the drive shaft, which increases the difficulty of pump processing and assembly, and the disassembly and adjustment of gears are also inconvenient; b. The overall structure is uneven, and the center of gravity of the pump is biased towards the side of the motor and gearbox.