External reflux type magnetic pump
Technical field
What the present invention relates to is magnetic drive pump.
Background technique
Magnetic drive pump is a kind of the cooperation with interior magnet rotor by magnetic force by outer magnet rotor to drive interior magnet rotor rotation, and interior magnet rotor drives pump shaft and rotates, and makes a kind of pump of the wheel rotation work on the pump shaft in the pump housing.Magnetic drive pump interior magnet rotor and outside be provided with separation sleeve between magnet rotor and form Seal cage, main shaft and interior magnet rotor are sealed in the Seal cage, its effect one is can prevent by the outside seepage of pump spindle end, the 2nd, main shaft and interior magnet rotor are partly cooled off.
Prior art is that the zone of high pressure in the pump chamber is communicated with the separation sleeve inner chamber, the main through hole through offering at the pump shaft center of medium is back to the low pressure area of impeller central part, the hole of part medium on sliding bearing is back to low pressure area simultaneously, the eddy current heat heat radiation that realization produces separation sleeve and sliding bearing is lubricated and cools off, promptly so-called in the backflow magnetic drive pump.Its shortcoming deficiency is that the separation sleeve inner chamber bears higher pressure, so the corresponding bearing capacity requirement that has improved separation sleeve; Medium after separation sleeve is heated is directly got back to the pump intake low pressure area by the pump shaft center hole, causes easily and cavitates and find time, and influences the pump proper functioning; Because the cooling medium in the separation sleeve is to be refluxed by the pump shaft center hole, and the particulate matters such as sand grains in the cooling medium are subjected to interior magnet rotor rotary centrifugal force effect, be difficult for flowing into, but accumulate in the separation sleeve bottom periphery, the separation sleeve bottom is produced abrasion to the pump shaft center hole; The pump shaft axial force balance is bad, causes big specification magnetic drive pump thrust disc to damage easily.
Summary of the invention
The objective of the invention is to improve, provide a kind of usability good external reflux type magnetic pump at the shortcoming of above-mentioned prior art.
The present invention includes the pump housing, pump cover, pump shaft, impeller, interior magnet rotor, outer magnet rotor, separation sleeve, link press span, bearing housing, live axle, pump shaft and pump cover are by the bearing means installation that is rotatably assorted, pump cover, link press span is fixedlyed connected with the pump housing, bearing housing docks fixedly connected with link press span, interior magnet rotor is fixedly mounted on the pump shaft axle head, outer magnet rotor is fixedly mounted on the live axle axle head, interior magnet rotor and outside separation sleeve is set between magnet rotor, separation sleeve and pump cover are sealedly and fixedly connected, it is characterized in that, the little gap of interior magnet rotor and bearing support rear end is slidingly matched, magnet rotor cooperates with the bearing support rear end formation slipper seal of pump cover promptly, be provided with reflow pipe at separation sleeve inner chamber and pump intake end, promptly inner chamber A and the pump intake end in separation sleeve and pump cover formation is provided with external reflow pipe, on the pump cover bearing support, axially offer pod apertures, on the disc of interior magnet rotor or wheel hub, offer axial throttle orifice, form the pump medium from the pump discharge zone of high pressure by the impeller rear side through pod apertures---throttle orifice---the circulation loop of separation sleeve inner chamber---reflow pipe---pump intake end.
The medium in pump chamber inner high voltage of the present invention district is from impeller rear side magnet rotor front side in pod apertures that the pump cover bearing support is offered (and the gap of sliding bearing and sliding bearing offer lubrication groove) enters into, the throttle orifice step-down of offering on interior magnet rotor disc or wheel hub enters separation sleeve inner chamber A, take away the eddy current heat that separation sleeve produces through magnetic gap, separation sleeve is cooled off, get back to the pump intake end from separation sleeve inner chamber A through external return line flow then and circulate.Having overcome prior art is heated flowing medium and directly gets back to the disadvantage that the pump intake low voltage terminal easily produces cavitation erosion and finds time through pump shaft center return port (return flow type promptly), can connect outside where necessary in addition heat radiation cooling device is set on the reflow pipe, reflux medium is cooled off, produce cavitation erosion and vaccuum phenomenon when the cooling medium of further having avoided being heated is got back to the pump intake end, improved the reliability that magnetic drive pump is applied to volatile class medium greatly.Separation sleeve inner chamber A is a low pressure, has reduced the bearing capacity requirement to separation sleeve, and has significantly improved the working pressure of magnetic drive pump.The pressure at pump shaft bearing two ends equates, acts on epitrochanterian axial force balance, and thrust disc is not subjected to the responsive to axial force wearing and tearing very little.The particle that enters in the medium of separation sleeve bottom outwards flows with MEDIA FLOW, can not deposit collection in the separation sleeve bottom and cause wearing and tearing to the separation sleeve bottom.Do not need on the pump shaft to hit heart through hole, simplified manufacturing process, be convenient to manufacturing.
Description of drawings
Fig. 1 is the invention process structural representation.
Embodiment
The present invention includes the pump housing 1, pump cover 2, pump shaft 3, impeller 4, interior magnet rotor 5, outer magnet rotor 6, separation sleeve 7, link press span 8 and bearing housing 9, live axle 10, pump shaft 3 and pump cover 2 are by plain bearing arrangement 20 installation that is rotatably assorted, pump cover 2, link press span 8 is fixedlyed connected with the pump housing 1, bearing housing 9 docks fixedly connected with link press span 8, interior magnet rotor 5 is fixedly mounted on pump shaft 3 axle heads, outer magnet rotor 6 is fixedly mounted on live axle 10 axle heads, interior magnet rotor 5 and outside 6 of magnet rotors separation sleeve 7 is set, separation sleeve 7 is sealedly and fixedly connected by land 71 and pump cover 2, it is characterized in that, interior magnet rotor 5 is slidingly matched by the little gap of seal ring with the rear end of the bearing support 21 of pump cover, magnet rotor cooperates with the bearing support rear end formation slipper seal of pump cover promptly, shown in the accompanying drawing embodiment, on bearing support 21 rear ends of the propeller boss 51 of interior magnet rotor 5 and pump cover, be fixed with seal ring 52 respectively, 22 mutual slipper seals cooperate, be provided with external reflow pipe 15 at separation sleeve 7 and inner chamber A and the pump intake end that pump cover 2 forms, this reflow pipe 15 can certainly be that the supplying tube with pump intake end front portion joins, on pump cover bearing support 21, axially offer pod apertures 23, on interior magnet rotor 5 propeller boss, offer throttle orifice 50, form the pump medium from the pump discharge zone of high pressure by impeller 4 rear sides 40 through pod apertures 23---throttle orifice 50---separation sleeve inner chamber A---reflow pipe 15---circulation loop of pump intake end.
Be heated back generation vaporization for preventing that further cooling medium from cooling off at process separation sleeve 7, cause pump depletion, connect outside on the reflow pipe 15 and can be provided with cooling unit,
For ease of discharging the gas among the separation sleeve inner chamber A, on reflow pipe 15, be provided with venting gas appliance.