Automatic suction type magnetic pump
The utility model relates to the improvement of magnetic force driven centrifugal pump (abbreviation magnetic drive pump), particularly a kind of self-priming magnetic drive pump with self-absorption function.
Inflammable, explosive, the hypertoxic volatile or precious liquids of industrial conveying such as magnetic drive pump is widely used in electroplating, chemical industry, nonferrous metallurgy and the manufacturing of shooting film.It is made of pump case, impeller, separation sleeve, internal-external magnetic steel and motor.It adopts magneto drive and has thoroughly solved the defective of centrifugal pump run, drip, leak, guarantees the safety of lives and properties.But present magnetic drive pump does not possess self-absorption function, therefore uses inconvenience, and difficulty can realize telecontrol simultaneously.
The purpose of this utility model provides a kind of magnetic drive pump with self-absorption function, to replace existing magnetic drive pump.
The utility model is achieved in that the running of magnetic drive pump is to rely on a magnetic coupling is arranged between motor and the impeller: outer steel cover and the electric machine main shaft formation driving link that links; Interior magnet steel and the impeller formation Passive part that fuses.One separation sleeve is arranged between the two.When electric motor starting, the rotation of driving link is because outer steel magnetic field is passed separation sleeve and acted on interior magnet steel, and the impeller of one rotates synchronously and make with it, so the liquid in the pick-up tube is inhaled into the inlet of rotary blade at full speed and is thrown and see off.Owing to the buffer action of separation sleeve between the inside and outside magnet steel has been stopped run, drip, leak.Its self-priming effect is according to the centrifugal pump principle, and promptly when in pump chamber and the pick-up tube during full of liquid, this pump promptly has self-absorption function.Therefore between pick-up tube end and filter one in device open flexibly, reliable sealing piston type bottom valve when closing.Bottom valve mainly is made up of cylinder body, piston and piston ring.Be processed with some runners in the wall of cylinder body, its sectional area is bordering on or is slightly less than the pick-up tube sectional area.Why the piston type bottom valve can make pump chamber and pick-up tube full of liquid all the time, this be because: piston ring relies on the elastic force of self and fits tightly with the inwall of cylinder body, and therefore only compressed gap is to sew passage, is referred to as theoretical leak cross-section.If piston and inboard wall of cylinder block gap are C, piston ring gap is g, then piston (diameter D) can be considered π DC with the area of sewing in casing wall gap, after the effect of piston ring labyrinth, it is sewed area and is reduced into Cg, that is dwindles π D/g doubly, as make D=100, g=0.10, C=0.10, then π DC=31.4mm
2, Cg=0 (01mm
2, that is dwindle 3140 times.Sew area and be reduced to atomic in the hope of improving the labyrinth seal effect, just making when selecting for use the angular cut form to add piston ring and increasing radical.In addition, piston ring has and strikes off the function that is attached to granule foreign on the cylinder wall, so the piston type bottom valve not only has seal action very reliably, and reduces the efficient of pump hardly because driving force is little.When impeller behind the electric motor starting with pump chamber in liquid get rid of to drain pipe, this moment, the impeller eye place formed negative pressuren zone, so piston is exposed the runner hole on the cylinder wall by last suction, enter the runner hole from the liquid of filter and in pump chamber, continued to get rid of to drain pipe by impeller to pick-up tube.After motor stops, the deadweight of liquid return flow velocity percussion and piston, so the runner hole that piston is fallen rapidly seal up on the casing wall is full of liquid in pump chamber and the pick-up tube, even the piston type bottom valve has the seepage of denier, can replenish in a steady stream by the liquid that is stored in the drain pipe fully.The utility model gives when mounted and irritates the liquid that advances to carry, the pumping liquid of after this can starting shooting at any time earlier.
The existing magnetic drive pump that the utility model compares has the advantages such as efficient that easy to use, remote controlled and self-absorption function does not reduce pump.The utility model will be further described below in conjunction with accompanying drawing.
Fig. 1. be model utility principle sectional view.(the bottom valve part is slightly given amplification).
With reference to Fig. 1. the power of magnetic drive pump is less, so connects with volute seat (7) between volute (13) and the motor (6).Between volute (13) and volute seat (7), a separation sleeve (10) is arranged, it makes the outer steel external member (8) on the electric machine main shaft isolate (internal-external magnetic steel (9)) mutually with impeller (11) the one interior magnet steel in the volute (13), and impeller shaft (12) is positioned respectively on volute (13) and the separation sleeve (10).A piston type bottom valve that is made of cylinder body (4)-(5), piston (2) (comprising metal frame (3)) and piston ring (1), uniform runner in cylinder body (4)-(5) wall are arranged between pick-up tube (14) end and filter (1 ').When starting electrical machinery (6), outer steel external member (8) rotation, and the impeller (11) that contains interior magnet steel is rotated, so the liquid in the pump chamber (pump gives perfusion earlier when installing) is thrown toward drain pipe (15) and makes the impeller eye place form negative pressuren zone, liquid in the pick-up tube (14) is inhaled into impeller (11) inlet and makes the terminal negative pressuren zone that forms of pick-up tube (14) like this, therefore piston (2) is exposed interior runner hole, cylinder body (4)-(5) by last suction, is constantly got rid of to drain pipe (15) by impeller (11) until pump chamber so the liquid of process filter (1 ') flows to pick-up tube (14) from runner.After motor stops, the deadweight of liquid return flow velocity percussion and piston (2), make piston (2) fall the runner hole that seals up on the casing wall, so interior full of liquid of pump chamber and pick-up tube (14), even the seepage of denier is arranged, can replenish in a steady stream by the liquid that is stored in the drain pipe (15) fully.When the pumping aggressive medium, impeller (11), volute (13), piston (2), cylinder body (4)-(5), pick-up tube (14) and separation sleeve (10) etc. can adopt stainless steel, titanium alloy and overall plastic realization anticorrosion, plastics can be chlorinated polyether, polypropylene, polyphenylene sulfide and fluoroplastic (comprising Fluoroine-containing plastic alloy) or the like.Impeller shaft (12) adopts pottery (as 99% aluminium oxide ceramics) or stainless steel.Piston ring (1) is existing plastics standard piece (as the teflon piston ring), therefore makes the corresponding size of piston and cylinder body after determining piston ring (1) plastics standard piece.Piston (2) lower end is the streamline convex surface shape, makes fluid flow into uniform runner with the streamline shape, reduces fluid resistance.
