CN201250812Y

CN201250812Y - External reflux-type magnetic drive pump

Info

Publication number: CN201250812Y
Application number: CNU2008200153098U
Authority: CN
Inventors: 贺宝海; 于华宇; 郭华中; 何德贵
Original assignee: Dandong Kelong Group Co Ltd
Current assignee: Dandong Colossus Group Co Ltd; Dandong Kelong Group Co Ltd
Priority date: 2008-08-27
Filing date: 2008-08-27
Publication date: 2009-06-03
Anticipated expiration: 2018-08-27

Abstract

The utility model provides an external reflux-type magnetic drive pump. An inner magnetic rotor (5) is in slide fit with the back end of the bearing block (21) of a pump bonnet with a close clearance between the inner magnetic rotor and the back end. External return pipes (15) are arranged in the intracavity (A) of a spacer sleeve (7) and the inlet end of the pump; axial diversion holes (23) are arranged on the bearing block (21) of the pump bonnet; restriction orifices (50) are arranged on the inner magnetic rotor (5), thus forming a circulation loop of a pump medium from the high-pressure area of the outlet of the pump as follows: the back side of the impellers (4)-the diversion holes (23)-restriction orifices (50)-the intracavity (A) of the spacer sleeve-the return pipes (15)-the inlet end of the pump. The external reflux-type magnetic drive pump overwhelms the high pressure in the intracavity (A) of the spacer sleeve, cavitation corrosion and evacuation of the internal reflux-type structure, and improves the service performance and the reliability of the magnetic drive pump, and is manufactured conveniently.

Description

External reflux type magnetic pump

Technical field

The utility model relates to 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.

The model utility content

The purpose of this utility model is to improve at the shortcoming of above-mentioned prior art, provides a kind of usability good external reflux type magnetic pump.

The utility model 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 the utility model pump chamber inner high voltage 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 that the utility model is implemented structural representation.

Embodiment

The utility model 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.

Claims

1, external reflux type magnetic pump, include 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 bearing means (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 head, outer magnet rotor (6) is fixedly mounted on live axle (10) axle head, interior magnet rotor (5) and outside separation sleeve (7) is set between magnet rotor (6), separation sleeve (7) is sealedly and fixedly connected with pump cover (2), it is characterized in that, interior magnet rotor (5) is slidingly matched with the little gap, bearing support (21) rear end of pump cover, magnet rotor cooperates with the bearing support rear end formation slipper seal of pump cover promptly, the inner chamber (A) that forms at separation sleeve (7) and pump cover (2) is provided with external reflow pipe (15) with the pump intake end, on pump cover bearing support (21), axially offer pod apertures (23), on the disc of interior magnet rotor (5) or wheel hub, offer throttle orifice (50), form the pump medium from the pump discharge zone of high pressure by impeller (4) rear side through pod apertures (23)---throttle orifice (50)---separation sleeve inner chamber (A)---reflow pipe (the 15)---circulation loop of pump intake end.

2, external reflux type magnetic pump according to claim 1 is characterized in that, is fixed with friction ring (52,22) respectively and is slidingly matched mutually on bearing support (21) rear end of the propeller boss (51) of interior magnet rotor (5) and pump cover.

3, external reflux type magnetic pump according to claim 1 and 2 is characterized in that, connects reflow pipe (15) outside and is provided with cooling unit; Venting gas appliance.