CN202579208U

CN202579208U - Improved magnetic pump

Info

Publication number: CN202579208U
Application number: CN 201220220206
Authority: CN
Inventors: 王学; 魏凤蕾
Original assignee: YANTAI SHENGQUAN PUMP CO Ltd
Current assignee: YANTAI SHENGQUAN PUMP CO Ltd
Priority date: 2012-05-17
Filing date: 2012-05-17
Publication date: 2012-12-05
Anticipated expiration: 2022-05-17

Abstract

The utility model discloses an improved magnetic pump. An annular pressure adjustment cavity (9) is formed between a balance disk (2) and the rear end of a blade wheel (1); an inclined flow guide hole (3-1) is formed in a pump cover (3); the rear end of the inclined flow guide hole (3-1) is communicated with an annular inner region (8); the front end of an axial balance hole (2-1) in the balance disk (2) is communicated with the annular pressure adjustment cavity (9); and the rear end of the axial balance hole (2-1) is communicated with the inclined flow guide hole (3-1). A cooling medium automatically flows under the action of pressure difference between a high-pressure region and a low-pressure region in a pump cavity without extra flow power. A cooling inner magnetic steel medium flows into the annular pressure adjustment cavity from the high-pressure region, and the pressure difference is small, so that pressure of the medium in the isolation sleeve is increased, and cavitation is further avoided; and moreover, damage to the bottom of the isolation sleeve is reduced, the reliability of running of the magnetic pump is improved, and the service life of the isolation sleeve is prolonged.

Description

A kind of improved magnetic drive pump

Technical field

The utility model relates to a kind of magnetic drive pump.

Background technique

Magnetic drive pump is to lean on the inside and outside magnetic coupling transmission of separation sleeve, with the sealing of static seal pad, has realized substituting motive sealing with static seal between separation sleeve and pump cover, and the nothing that reaches is truly leaked.Be specially adapted to the conveying of inflammable, explosive, poisonous and valuable medium.For improving reliability and being applicable to the high pressure operating mode, the separation sleeve material is generally metallic material, and commonly used have 316L, titanium alloy, a Hastelloy etc.But these metallic material all have magnetic conductivity, and the magnetic force line cutting separation sleeve that is produced during the internal-external magnetic steel rotation, separation sleeve can produce magnetic whirlpool heat, must design cooling circuit, with medium own heat are taken away.

Existing magnetic drive pump adopts pump cover zone of high pressure rat holing feed liquor usually, and pump shaft drills through the hole and returns liquid and carry out cool cycles.Because impeller inlet place pressure is low, the separation sleeve base pressure that communicates with this inlet is also on the low side, because the medium that magnetic drive pump is carried is generally organic substance, is prone to vaporization, and the separation sleeve base pressure is low, is prone to take place cavitation phenomenon, damages separation sleeve.

Publication number is that the Chinese invention patent of CN101555880B discloses a kind of magnetic drive pump; The zone of high pressure perforate that its medium self-pumping that is used to cool off separation sleeve covers is introduced; Flow through successively MEDIA FLOW through hole on bearing housing inner chamber, the pump shaft, flow to magnet rotor chamber in the separation sleeve through being installed on the receded disk impeller effect of pump shaft rear end, be back to pump chamber inner high voltage district at last by portalling.This design has improved the separation sleeve pressure inside, has certain effect for suppressing the medium gasification.But; Because circulating cooling medium is from the zone of high pressure and be back to the zone of high pressure; Importing and exporting two ends pressure reduction can't satisfy from mobilization force; Must rely on its receded disk impeller that mobilization dynamic is provided, and the manufacture cost that receded disk impeller has improved magnetic drive pump on the one hand is installed, had higher requirement in the space in the separation sleeve on the other hand in the pump shaft rear end.

The model utility content

The utility model aims to provide a kind of improved magnetic drive pump; Technical problem to be solved is through the glide path of improvement magnetic drive pump cooling medium, and to improve pressure medium in the separation sleeve; Improve the cavitation resistive property of magnetic drive pump, and then prolong the working life of separation sleeve.

The technological scheme that the utility model adopted is following:

A kind of improved magnetic drive pump; Comprise the impeller that is connected the pump shaft front end and is positioned at pump chamber, be positioned at the Balance disc at impeller rear, the separation sleeve that is positioned at the pump cover at Balance disc rear and is positioned at the pump cover rear; Pump shaft is installed in the pump cover through the front and back sliding bearing; It is characterized in that: offer radially guiding gutter on the described Balance disc, its import is communicated with zone of high pressure, impeller cylindrical place, and its outlet is communicated with the inner chamber of separation sleeve through the axial diversion hole that is opened on the pump cover; On said pump shaft, offer pump shaft center hole and pump shaft radial hole, the rear end of pump shaft center hole is communicated with the inner chamber of said separation sleeve, and front end is communicated with the pump shaft radial hole; The annular inner region that surrounds between described pump shaft radial hole and pump cover, front and back sliding bearing and the pump shaft is connected; Also comprise annular pressure adjusting chamber; The front-end face that this annular pressure is regulated the chamber is an impeller; The ear end face that this annular pressure is regulated the chamber is the front face of Balance disc; The annular inner wall face that this annular pressure is regulated the chamber is the outer wall of Balance disc inner ring plate, and the annular outer wall face that this annular pressure is regulated the chamber is the internal face of impeller increasing back sealing ring; The ear end face of impeller bonnet inner ring plate and the front-end face of Balance disc inner ring plate over against and leave flying height; On impeller, offer equalizing orifice, its front end is communicated with the low pressure area of said pump chamber, and its rear end is communicated with the pressure-releasing chamber that is positioned at impeller rear, Balance disc inner ring plate inboard; On pump cover, offer oblique pod apertures, its rear end is communicated with said annular inner region; On Balance disc, also offer the longitudinal balance hole, its front end is regulated the chamber with said annular pressure and is communicated with, and the rear end is communicated with said oblique pod apertures.

The good effect of the utility model is:

Cooling medium relies on height nip pressure reduction gravity flow in the pump chamber, and mobilization dynamic needn't extraly be provided.Cooling medium flows into from zone of high pressure, impeller cylindrical place, and magnet steel surface in the cooling flows into annular pressure by axis hole and oblique pod apertures and regulates the chamber, regulates the chamber through annular pressure again and is back to the suction eye low pressure area.It is that balancing axial thrust is set that annular pressure is regulated the chamber; Its pressure is after the axial seal link stream step-down of impeller and Balance disc formation; Be lower than impeller cylindrical place zone of high pressure pressure; Regulate the chamber through the annular pressure of impeller and Balance disc formation again and build the pressure, pressure is higher than the pressure in the pressure-releasing chamber, more is higher than suction eye pressure.Magnet steel medium in the cooling flows into annular pressure by the zone of high pressure and regulates the chamber, and pressure reduction is little, thereby has improved pressure medium in the separation sleeve, and then has avoided cavitation erosion, has alleviated the separation sleeve bottom and has damaged the working life of having improved magnetic drive pump maintainability and separation sleeve.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing and embodiment.

As shown in Figure 1, this instance comprises the impeller 1 that is connected pump shaft 7 front ends and is positioned at pump chamber, is positioned at the Balance disc 2 at impeller 1 rear, the separation sleeve 4 that is positioned at the pump cover 3 at Balance disc 2 rears and is positioned at pump cover 3 rears.Wherein, Balance disc 2 is fixedly installed in respectively on the pump cover 3 with separation sleeve 4.Pump shaft 7 is installed in the pump cover 3 through the front and back sliding bearing.Also comprise outer steel 6 that is arranged at separation sleeve 4 outsides and the interior magnet steel 5 that is arranged at separation sleeve 4 inside.

Offer radially guiding gutter 12 on the described Balance disc 2, its import is communicated with zone of high pressure, impeller 1 cylindrical place, and its outlet is communicated with the inner chamber of separation sleeve 4 through the axial diversion hole 3-2 that is opened on the pump cover 3.The medium in said pump chamber inner high voltage district is through radially guiding gutter 12 and axial diversion hole 3-2 get into the inner chamber of separation sleeve 4.

On said pump shaft 7, offer pump shaft center hole 7-1 and pump shaft radial hole 7-2, the rear end of pump shaft center hole 7-1 is communicated with the inner chamber of said separation sleeve 4, and front end is communicated with pump shaft radial hole 7-2.The annular inner region 8 that surrounds between described pump shaft radial hole 7-2 and pump cover 3, front and back sliding bearing and the pump shaft 7 is connected.The medium that refluxes from the inner chamber of separation sleeve 4 enters into said annular inner region 8 from pump shaft center hole 7-1 and pump shaft radial hole 7-2.

Form an annular pressure between described Balance disc 2 and impeller 1 rear end and regulate chamber 9; The front-end face that this annular pressure is regulated chamber 9 is an impeller 1; The ear end face that this annular pressure is regulated chamber 9 is the front face of Balance disc 2; The annular inner wall face that this annular pressure is regulated chamber 9 is the outer wall of Balance disc inner ring plate 2-2, and the annular outer wall face that this annular pressure is regulated chamber 9 is the internal face of impeller increasing back sealing ring 1-3.The internal face of the outer wall of impeller increasing back sealing ring 1-3 and Balance disc seal ring 2-3 forms the gap to realize the throttling step-down.The ear end face of impeller bonnet inner ring plate 1-2 and the front-end face of Balance disc inner ring plate 2-2 over against and leave flying height 10.This flying height 10 floats between 0.5～1.0mm with the axial float of pump shaft 7, and the axial movement value of pump shaft 7 depends on the variation of pressure mediums in the said annular pressure adjusting chamber 9.

On impeller 1, offer equalizing orifice 1-1, its front end is communicated with the low pressure area of said pump chamber, and its rear end is communicated with the pressure-releasing chamber 11 that is positioned at impeller 1 rear, Balance disc inner ring plate 2-2 inboard.On pump cover 3, offer oblique pod apertures 3-1, its rear end is communicated with said annular inner region 8.On Balance disc 2, also offer longitudinal balance hole 2-1, its front end is regulated chamber 9 with said annular pressure and is communicated with, and the rear end is communicated with said oblique pod apertures 3-1.Reflux mediums in the annular inner region 8 enter into said pressure-releasing chamber 11 and through equalizing orifice 1-1 feed pressure suction port low pressure area through said flying height 10 then in oblique pod apertures 3-1 and longitudinal balance hole 2-1 enter into annular pressure adjusting chamber 9.

Claims

1. improved magnetic drive pump; Comprise the impeller (1) that is connected pump shaft (7) front end and is positioned at pump chamber; Be positioned at the Balance disc (2) at impeller (1) rear; The separation sleeve (4) that is positioned at the pump cover (3) at Balance disc (2) rear and is positioned at pump cover (3) rear, pump shaft (7) is installed in the pump cover (3) through the front and back sliding bearing, it is characterized in that: offer radially guiding gutter (12) on the described Balance disc (2); Its import is communicated with zone of high pressure, impeller cylindrical place, and its outlet is communicated with the inner chamber of separation sleeve (4) through the axial diversion hole (3-2) that is opened on the pump cover (3); On said pump shaft (7), offer pump shaft center hole (7-1) and pump shaft radial hole (7-2), the rear end of pump shaft center hole (7-1) is communicated with the inner chamber of said separation sleeve (4), and front end is communicated with pump shaft radial hole (7-2); The annular inner region (8) that surrounds between described pump shaft radial hole (7-2) and pump cover (3), front and back sliding bearing and the pump shaft (7) is connected; Also comprise annular pressure adjusting chamber (9); The front-end face that this annular pressure is regulated chamber (9) is impeller (1); The ear end face that this annular pressure is regulated chamber (9) is the front face of Balance disc (2); The annular inner wall face that this annular pressure is regulated chamber (9) is the outer wall of Balance disc inner ring plate (2-2), and the annular outer wall face that this annular pressure is regulated chamber (9) is the internal face of impeller increasing back sealing ring (1-3); The front-end face of the ear end face of impeller bonnet inner ring plate (1-2) and Balance disc inner ring plate (2-2) over against and leave flying height (10); On impeller (1), offer equalizing orifice (1-1), its front end is communicated with the low pressure area of said pump chamber, and its rear end is communicated with the pressure-releasing chamber (11) that is positioned at impeller (1) rear, Balance disc inner ring plate (2-2) inboard; On pump cover (3), offer oblique pod apertures (3-1), its rear end is communicated with said annular inner region (8); On Balance disc (2), also offer longitudinal balance hole (2-1), its front end is regulated chamber (9) with said annular pressure and is communicated with, and the rear end is communicated with said oblique pod apertures (3-1).