Screw vacuum pump

JZ-37AYC

Purpose of screw vacuum pump:
After fine dynamic balance correction, the two screws are supported by bearings and installed in the pump housing. There is a certain gap between the screws. Therefore, when the pump is working, there is no friction between them, the operation is stable, the noise is low, and the working chamber does not need lubricating oil. Therefore, the dry screw pump can pump out the gas containing a large amount of water vapor and a small amount of dust. The extreme vacuum is higher, the power consumption is lower, and the pump has the advantages of energy saving, maintenance free, etc. It is a new generation of oil sealed vacuum pump.

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First, the introduction of oil injection screw vacuum pump
Screw vacuum pump is oil injection single-stage twin screw vacuum pump, the motor through the coupling to drive the main engine to rotate for vacuum suction, through the gear pump on the body to absorb oil, cooling and filtration after spraying into the main engine cavity for cooling and lubrication, the compressed cavitydischarged air and oil mixture gas through coarse, fine two separation,the oil in the oil and gas mixture Exit and finally get clean air discharge. The automatic adjustment of the exhaust port structure is adopted, and when the external pressure is low, the exhaust orifice is increased to reduce the internal compression of the compressor, so that the internal compression pressure is equal to the exhaust pressure to achieve the purpose of energy saving.
Second, screw vacuum pump body structure
1. Basic structure
The company produces screw vacuum pump, which is a kind of double-shaft positive displacement rotary vacuum pump. The air intake port is opened at the upper end of the casing, the exhaust port is opened in the lower part, and the two high-precision main and auxiliary rotorsare installed horizontally and parallel in the casing part. The main rotor has five shaped teeth, while the secondary rotor has six shaped teeth; The main rotor diameter is larger and the secondary rotor diameter is smaller. The tooth shape forms a spiral shape,which surrounds the outer edge of the rotor, and the two tooth shapes gnaw with each other. The main and auxiliary rotors are supported by bearings . The transmission mode of the body is direct transmission of the coupling.
2. Meshing
The motor drives the main rotor to rotate through the transmission mechanism. The coolant is sprayed directly into the meshing part between the rotors through the nozzle from the lower part of the casing, and mixes with the airto take away the heat generated by the compression, while forming an oil film, on the one hand, to prevent direct contact between the metal and metal between the rotors, on the other hand , closing the gap between the rotors and between the rotors and the casing . The injected lubricating oil also reduces the noise generated by high-speed compression.
Third, the working principle of screw vacuum pump
1. Inhalation process:
The screw vacuum pump has no intake and exhaust valve groups, and the intake air is only regulated by the opening and closing of the regulating valve. When the groove space of the main and auxiliary rotors is transferred to the opening of the casing intake end wall, its space is the largest, and the groove space under the rotor communicates with the free air of the air inlet, because the air in the tooth groove is fully discharged when the exhaust is finished, the tooth groove is in a vacuum state, and when it is transferred to the air inlet, the air in the vacuum container is sucked in and flow axiallyinto the groove of the main and auxiliary rotors. When the air fills the entire tooth groove, the end face of the intake side of the rotor is turned away from the air intake of the casing,and the air between the tooth grooves is closed, which is the"intake process".
2. Sealing and conveying process:
When the suction is completed, the main and auxiliary rotor teeth are sealed with the casing,and the air in the tooth groove no longer flows out,that is, the"closing process". The two rotors continue to rotate, their tooth peaks and groove coincide at the suctionend, and the anastomotic surface gradually moves to the exhaustend, which is the" conveying process".
3. Compression and injection process:
During the conveying process, the meshing surface gradually moves to the exhaust end, so that the tooth groove space between the meshing surface and the exhaust port is gradually reduced, the air in the tooth groove is gradually compressed,andthe pressure gradually increases, which is the"compression process". At the same time ofcompression , the lubricating oil is also sprayed into the compression chamber and mixed with the air due to the pressure difference.
4. Exhaust process:
When the exhaust port end face of the rotor communicates with the casing, the compressed air begins to be dischargeduntil the aiming surface of the tooth peak and the tooth groove moves to the exhaust end face of the casing, at which time the tooth groove spacebetween the grunt surface of the two rotors and the exhaust port of the casing is zero, that is, the"exhaust process"is completed. At the same time, the length of the groove between the meshing surface of the rotor and the air intake of the casing reaches the longest length, thus starting a new compression cycle.
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