Pump body structure of constant-temperature and high-efficiency roots pump

Abstract

A pump body structure of a constant-temperature and high-efficiency roots pump comprises a pump shell. A gas inlet is formed in the upper end of the pump shell. An exhaust port is formed in the lowerend of the pump shell. A jacket layer is formed in the middle of the pump shell. Multiple reinforcing ribs are fixedly installed in the jacket layer. Circulation ellipse through holes are formed in the side face of each reinforcing rib. Multiple liquid inlets and liquid outlets are formed in the end faces of the two sides of the pump shell. The liquid outlets and the liquid inlets all communicatewith the jacket layer. The pump body structure overcomes the defects in the prior art, and the jacket layer of the whole pump is rapidly filled with cooling liquid or compressed air through the liquidinlets in the end faces of the pump shell; and because the specific heat capacity of liquid is far higher than that of gas, the compressed air conducts forced-convection heat exchange, the outlet flow of a cooling medium can also be controlled, or constant temperature or temperature rise of the pump shell is achieved by injecting a hot medium, the wall of the pump shell reaches the assigned temperature, the cooling effect can be improved, and constant-temperature control can also be achieved.

Description

technical field [0001] The invention relates to the technical field of Roots pumps, in particular to a pump body structure of a constant temperature and high-efficiency Roots pump. Background technique [0002] Roots vacuum pump (referred to as Roots pump) is a rotary variable displacement vacuum pump, which evolved from Roots blower. The ultimate vacuum of the Roots pump depends not only on the structure and manufacturing accuracy of the pump itself, but also on the ultimate vacuum of the backing pump. In order to improve the ultimate vacuum of the pump, Roots pumps can be used in series. The working principle of the Roots pump is that through the continuous rotation of the rotor, the pumped gas is sucked from the air inlet into the space v0 between the rotor and the pump casing, and then discharged through the exhaust port. [0003] In the pump casing of all Roots vacuum pumps or Roots blowers on the market, a pair of Roots rotors can be placed in the pump chamber. The ...

AI Technical Summary

Problems solved by technology

[0004] However, although the heat dissipation area of ​​the pump casing is increased by adding ribs, it still belongs to natural radiation heat dissipation or convection air cooling, and the heat transfer effect is relatively poor, especially the surface temperature of the pump casing near the exhaust port is very high, sometimes exceeding 100 °C, can cause burns if not protected

Secondly, since both sides of the exhaust port at the bottom of the existing Roots pump casing are horizontal, condensed liquid or dust is easier to form and accumulate at the bottom during use

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