Inertia vacuum assisted self-priming pump

An inertia vacuum assisted self-priming pump, characterized by comprising a centrifugal pump and a rotary vacuum pump, wherein a pedestal is fixed above a frame of the centrifugal pump, a rotary vacuum pump is mounted above the pedestal and covered by an enclosure;

• The centrifugal pump consists of an eccentric reducer, a suction cover, a volute, an impeller, a casing cover, a shaft, an adaptor, a frame and a discharge check valve. The suction cover is fitted onto the front end of the volute, the eccentric reducer is mounted in front of the suction cover, a flow switch is installed on the top of the reducer, a check valve is mounted onto the centrifugal pump discharge flange, the casing cover is fitted onto the rear end of the volute, an oil groove circumferentially surrounding the centrifugal pump shaft is arranged outside of the stuffing box of the casing cover, the casing cover backwards connects to the adapter and frame in sequence, a set of bearings are mounted in the frame, the shaft goes through the frame and then extends out at the driving end to connect a coupling which will either couple to an engine or an electric motor;
• The non-driving end of the shaft goes through the casing cover and then enters into the volute, the impeller is located at the center or a little bit off center of the volute water passage, and mounted on the shaft;
• The rotary vacuum pump's shaft drive end is connected to the centrifugal pump shaft drive end by a belt, a pulley and an electromagnetic clutch. The electromagnetic clutch will enable the rotary vacuum pump to rotate simultaneously with the centrifugal pump's shaft or unlink to the centrifugal pump's shaft if needed. A built-in oil reservoir is set inside of the vacuum pump's enclosure which is installed on the top of the pedestal to cover the rotary vacuum pump, two hoses were set to connect the oil reservoir and the oil groove;
• the inner upper part of the oil reservoir is connected with the upper part of the oil groove in the casing cover by an upper oil pipe, the inner lower part of the oil reservoir is connected with the lower part of the oil groove in the casing cover by a lower oil pipe, a circulating oil loop is formed between the oil reservoir and the oil groove to protect the mechanical seal in case of pump runs dry. A temperature meter is mounted outside of the oil reservoir to monitor the oil temperature.