Inertia vacuum assisted self-priming pump

Abstract

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.

1 . 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. 
     
     
         2 . The inertia vacuum assisted self-priming pump according to  claim 1 , characterized in that the vacuum assisted self-priming control device comprises flow switch, a single or a dual exhaust pipe assembly, an electromagnetic valve, an electromagnetic clutch, a vacuum pump and a controller, wherein the flow switch is normally closed and mounted at the top of the eccentric reducer, the electromagnetic valve is normally closed and mounted on the exhaust pipe assembly, the electromagnetic clutch is normally open and mounted on the shaft of the vacuum pump, the shaft of the vacuum pump is connected to the shaft drive end of the centrifugal pump by a pulley belt assembly and the electromagnetic clutch, the flow switch controls the power for both of the electromagnetic valve and the electromagnetic clutch by monitoring the water flow in the eccentric reducer to achieve automatic start/stop; Both the flow switch and the exhaust pipe assembly including the electromagnetic valve are mounted at the top of the eccentric reducer, and the eccentric reducer is mounted at the front of the suction cover, when the centrifugal pump is turned on, the normally closed flow switch connected to the controller is turned on, the electromagnetic clutch is turned on and closed immediately, the electromagnetic valve is turned on to open model, the vacuum pump starts to work and evacuate the air inside the suction pipe and the centrifugal pump through the exhaust pipe assembly. after several seconds, when water enters into the eccentric reducer, the water flow flushes the flow switch's contactor, the flow switch will be turned off immediately, the electromagnetic valve is immediately turned off to closed model to prevent the liquid from entering into the vacuum pump, meanwhile the electromagnetic clutch is immediately turned off and detaches from the vacuum pump shaft, the vacuum pump finished its priming, centrifugal pump starts to work, and the vacuum pump then switches to a dormant model. 
     
     
         3 . The inertia vacuum assisted self-priming pump according to  claim 1 , characterized in that the vacuum assisted self-priming control device may also comprise a flow switch, a float chamber assembly, an electromagnetic clutch, a vacuum pump and a controller, wherein the float chamber is located at the top of the eccentric reducer, a suction chamber cover is mounted at the top of the float chamber, a through hole is set in the center of the suction chamber cover, a gasket of float valve, a float ball and a stop motion mechanism are arranged in the float chamber, the stop motion mechanism includes a lever support connected to the bottom of the suction cover, a first lever and a second lever located above the first lever are rotationally mounted on the lever support, one end of the second lever and one end of the first lever are located below the gasket of float valve in sequence, the lower end of the gasket of float valve is connected to the end of the second lever extending below the gasket of float valve, the end of the first lever located below the gasket of float valve is connected to the float ball by a float valve lever and a U clamp, the other ends of the first lever and the second lever are connected by a lever connecting ring, a strainer is arranged above the position where the float chamber is connected with the suction pipe in the float chamber, the flow switch is mounted at the top of the eccentric reducer, the electromagnetic clutch is mounted on the shaft drive end of the vacuum pump, the shaft of the vacuum pump is connected to the shaft of the centrifugal pump by a pulley belt assembly and the electromagnetic clutch, wherein the gasket of float valve floats along with the float ball and vertically moves upwards and downwards in the float chamber to control the opening or closing of the exhaust pipe; when the centrifugal pump is turned on, the normally closed flow switch is turned on, the electromagnetic clutch is turned on and closed immediately, the vacuum pump starts to run and evacuate the air from the centrifugal pump and the suction pipe through the exhaust pipe assembly, the water will come up through the suction pipe and enter into the float chamber and pump volute, the float ball floats along with the water level until the gasket of float valve is closely attached to the seal seat of float valve to close the exhaust pipe to prevent the water from entering into then vacuum pump, meanwhile, the water flow in the eccentric reducer continues flushing the flow switch's contactor, the flow switch is set to be turned off after a few seconds when the water starts to flushes the flow switch's contactor, when the flow switch turned off, the electromagnetic clutch is immediately turned off, the turned-off clutch is detached from the vacuum pump shaft, the vacuum pump stops operating and enters a dormant state, and the vacuum pump completes evacuation. 
     
     
         4 . The inertia vacuum assisted self-priming pump according to  claim 1 , characterized in that the used vacuum pump is a rotary sliding vane type of vacuum pump, comprising a shaft, a volute, a casing cover, a rotor, a push lever and slide vanes, wherein a shaft of the rotary sliding vane vacuum pump is connected to the shaft of the centrifugal pump by the electromagnetic clutch and the pulley belt assembly and is driven to rotate, the slide vanes are driven to rotate close to the inner surface of the chamber of the volute by the rotor, an airtight chamber is formed by two adjacent slide vanes and the inner surface of the chamber of the volute, when the slide vanes rotate from the discharge to the suction: the volume of the airtight chamber is gradually increased and the intensity of pressure is reduced, air is pressed in the airtight chamber when the airtight chamber passes through the suction, the airtight chamber is filled with air and is rotated to the discharge of the pump, the combined total length of the two slide vanes mounted symmetrically about the center and the push lever between the slide vanes is unchanged, the airtight chamber space fitted with the irregular curved surface of the volute is gradually reduced, the intensity of pressure is gradually increased, and air is discharged out of the pump chamber of the vacuum pump when passing through the discharge; this process is repeated so that air at the suction may be quickly moved to the discharge of the volute through the pump chamber and then discharged out of the pump chamber to complete evacuation. 
     
     
         5 . The inertia vacuum assisted self-priming pump according to  claim 1 , characterized in that the pump discharge flange is installed a check valve.