Roots pump with improved structure

Abstract

The invention discloses a roots pump with an improved structure. The roots pump comprises a discharge port of a first discharge valve which is arranged on the top of the side of the air cylinder and is communicated with the bypass discharge channel, a cone-shaped valve seat which is arranged between the bypass channel and the discharge port, wherein the cone-shaped valve has a wide upper side and a narrow lower side, and a first discharge valve which is constituted by a metal ball which is arranged on the top of the valve seat and is in close contact with the valve seat through gravity and can close the discharge hole of the valve seat; and the seat valve is evaluated through maintaining the air pressure inside the bypass channel, and the discharge hole is opened.

Description

technical field [0001] The present invention relates to a Roots pump of improved construction which operates in such a way that the backing pumps are connected in series, and in particular, to a Roots pump of an improved construction which allows pumping of pumps which have not been treated by the backing pump in the middle of operation. The gas absorbed in it is discharged to the outside. Background technique [0002] Roots vacuum pumps are called booster vacuum pumps. When the pump shaft is used, the pump is connected to a backing pump (for example, a dry vacuum pump) and a dry vacuum pump. [0003] 1. Ordinary Roots vacuum pump [0004] The exhaust speed and final vacuum degree of the Roots vacuum pump can be determined according to the exhaust characteristics of the backing pump. Generally, the lower the final pressure of the backing pump or the faster the exhaust speed, the lower the final pressure of the Roots vacuum pump and the faster the exhaust speed. Ordinary ...

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Problems solved by technology

[0015] However, according to the above-described conventional technology for the Roots pump of the atmospheric pressure operation type, in the following process, in which, at the initial stage of pump operation, suction is and discharge gas with atmospheric pressure, the Roots pump is forced to suck the compressed gas in a vacuum environment and move the gas towards the backing pump, however, the compressed gas that is not discharged from the backing pump can continue to circulate in the Roots pump, and Can be processed through compression procedures and can also be discharged

Roots pumps of the above atmospheric pressure operation type are highly efficient and can reduce the operating time a little compared to ordinary Roots pumps (wherein, the residual gas has no circulation process), however, the backing pump needs to suck, compress and discharge the following gas: through the inlet port The gas that is normally sucked in the vacuum system, and the process gas discharged from the Roots pump together with the compressed residual air that is forced to circulate continuously in the Roots pump, so the discharge speed of the backing pump can affect the Roots pump The emission speed is reduced, so the emission efficiency is reduced. Such a method cannot effectively reduce the working time, which means that there are many problems that still need to be solved.

In addition, when compressed air is circulated in the Roots pump, an overload can occur in the space of the discharge inlet channel and at the cross-section of the circulation hole 13 where the bypass valve 28 is closing, so that the motor can be damaged and the rotation movement can be damaged. Parts may also be damaged

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