CN103161734A

CN103161734A - Screw pump and boiler heat cycle system with same

Info

Publication number: CN103161734A
Application number: CN 201110406232
Authority: CN
Inventors: S·阿伦库马; 叶才全; 潘广业
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Johnson Electric Shenzhen Co Ltd
Priority date: 2011-12-08
Filing date: 2011-12-08
Publication date: 2013-06-19

Abstract

The invention relates to a screw pump and a boiler heat cycle system with the screw pump. The screw pump comprises a rotor, a stator and two connecting tubes, wherein the stator is coupled with the rotor in a magnetic coupling mode, the two connecting tubes are arranged at two axial ends of the stator, the rotor comprises a main shaft, an impeller and a permanent magnet, the impeller is fixed on the main shaft and in a spiral structure, the permanent magnet is fixed on the outer surface of the impeller, the stator comprises a shell body, a stator iron core, a stator winding and two bearing supports, the stator winding is arranged on the stator iron core in a winding mode, the two bearing supports are fixed at two axial ends of the shell body, a through hole extending along the axial direction is formed in the shell body, the rotor is arranged inside the through hole, and the two bearing supports respectively support a pair of bearings so as to support the main shaft in a rotatable mode. The screw pump is high in efficiency, simple in manufacture process and low in cost.

Description

Volute pump and use the boiler hot circulatory system of this pump

Technical field

The present invention relates to axial-flow pump, relate in particular to the volute pump applicable to the boiler hot circulatory system.

Background technique

In traditional boiler hot circulatory system, make the recycle pump of pressurized with fluid and circulation adopt centrifugal pump more.In No. 96100846.6 patent application of China, a kind of recycle pump is disclosed, the motor that it comprises pump case, is located at the impeller in pump case and is located at pump case outside motor and pump case fixes.Pump case comprises the inlet passage that minute is located at its both sides and outlet passage and the wheel chamber that is formed centrally in housing, the opening between inlet passage and wheel chamber is located at the pump case roof, and the opening between outlet passage and wheel chamber is located at the pump case sidewall.Impeller is arranged in the wheel chamber.Drives impeller rotation in pump case is stretched in the rotating shaft of motor.During wheel rotation, fluid enters the wheel chamber through inlet channel, and delivers to outlet passage under the effect of the centrifugal force that impeller produces.

In prior art, the pump case of above-mentioned recycle pump adopts sand casting process to be made by metallic material usually, and its manufacturing process is more complicated and cost is higher.And pump shell structure is more complicated, and the curved shape of inlet passage and outlet can cause larger kinetic energy rejection, before for example current enter the wheel chamber, can clash into pump housing endophragm near the opening between inlet passage and wheel chamber, produces kinetic energy rejection.

The present invention aims to provide a kind of fluid pump that improves the problems referred to above.

Summary of the invention

One aspect of the present invention provides a kind of volute pump, comprise rotor, with the magnetic-coupled stator of rotor and two connecting tubes of being located at stator two axial ends; Wherein, described rotor comprises main shaft, is fixed in the impeller with helix structure of main shaft and is fixed in the permanent magnet on impeller outer surface; Described stator comprises housing, stator core, be wound in the staor winding of stator core and be fixed in the two bearings support of housing two axial ends, described housing is provided with the penetration hole that extends vertically, described rotor is located in penetration hole, and described two bearings support supports respectively pair of bearings rotatably to support described main shaft.

Better, described housing is overmolded onto on stator core and staor winding to seal described iron core and winding.

Better, described connecting tube is made of plastics.

Better, described permanent magnet is the plastic magnet of ring-type.

Better, described impeller comprises the quill shaft that is overmolded onto on main shaft and the spiral blade that extends from the outer surface of quill shaft.

Better, each bearing bracket is formed from steel, some ribs that hub section, the loose boss section of comprising radially extends and the connecting ring that connects each rib tip, and the inboard bearing support block that forms of described hub section is with spring bearing.

Better, the relative main shaft of described some ribs tilts.

Better, two axial ends of described penetration hole are provided with two stepped part, and the internal surface close-fitting of each bearing bracket and penetration hole also is located between corresponding stepped part and connecting tube.

Better, each connecting tube increases gradually along its caliber of direction towards housing.

Better, each connecting tube is near the end of housing and the internal surface close-fitting of penetration hole, and the outside one of the outer surface of described end is extended with extension part, and described extension part is fixed to housing by screw.

Better, be provided with seal ring between the end of each bearing bracket and the close housing of corresponding connecting tube.

The present invention provides a kind of boiler hot circulatory system on the other hand, has above-mentioned volute pump.

In illustrated embodiment of the present invention, the kinetic energy rejection that fluid enters the pump housing is less, make pump have higher efficient, and the manufacturing process of connecting tube is simple, and cost is lower.

In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet institute's accompanying drawing only provide with reference to and the explanation use, the present invention is limited.

Description of drawings

In accompanying drawing:

Fig. 1 illustrates the volute pump of one embodiment of the invention;

Fig. 2 is the sectional drawing of the volute pump of Fig. 1;

Fig. 3 illustrates the rotor of the volute pump of Fig. 1;

Fig. 4 illustrates the rotor of the volute pump of Fig. 1, wherein removes ring magnet;

Fig. 5 illustrates the volute pump of Fig. 1, wherein removes housing;

Fig. 6 illustrates the bearing bracket of the volute pump of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, by the specific embodiment of the present invention is described in detail, will make technological scheme of the present invention and other beneficial effects apparent.

See also accompanying drawing, the volute pump 10 of one embodiment of the invention can be used as the recycle pump of the boiler hot circulatory system, comprise rotor 20, with the magnetic-coupled stator 40 of rotor 20 and a pair of

connecting tube

60 and 62 of being located at 40 liang of axial ends of stator.

Rotor 20 comprises the main shaft 22 that can be made by steel, the impeller 24 that is fixed in main shaft 22, and permanent magnet 26.Wherein, impeller 24 is helix structure, has the spiral blade 30 that fixed cover is located at the quill shaft 28 on main shaft 22 and extends from the outer surface of quill shaft 28.Permanent magnet 26 is circular, and fixed cover is located at the outer circumferential face of helical blade 30, rotates together with impeller 24 and main shaft 22.Better, impeller 24 is made of plastics, and its quill shaft 28 is overmolded onto on main shaft 22; Permanent magnet 26 is made by plastic magnet, so that volute pump has lighter weight.Understandable, permanent magnet 26 can be also the block magnet of arc that is fixed in helical blade 30 outer surfaces along circumferential interval.

Stator 40 comprises housing 42, stator core 44 and is wound in the staor winding (not shown) of stator core 44.Stator core 44 can be adopted separate type, and along circumferentially assembling, each separation member has a utmost point section 45 and is used for being wound around staor winding by some separation members.What housing 42 was better is the square cylinder that extends vertically, establishes the installation that mounting hole 46 is used for pump for its four jiaos.Housing is provided with the circular penetration hole that extends vertically, and two axial ends of penetration hole are provided with two stepped part 48.Stator core 44 and the diametrically opposed setting of ring magnet 26 in the axial direction all between two stepped part 48, have air gap between the penetration hole of the outer surface of toroidal magnet 26 and housing 42.In the present embodiment, housing 42 is overmolded onto on stator core 44 and staor winding, stator core 44 and staor winding and the fluid isolation that is pumped can be opened.

Pair of bearings support 50 and 52 is installed in respectively two axial ends of housing 42.Each bearing bracket can be made into integration by steel, comprises some ribs 56 that hub section 54, loose boss section 54 radially extends and the connecting ring 58 that connects each rib 56 ends.The inboard bearing support blocks 55 that form of hub section 54, the bearing (not shown) of being made by graphite are installed in bearing support block 55 and supports main shaft 22 rotatably.The outer wall 57 of connecting ring 58 is supported by stepped part 48 with the internal surface close-fitting of penetration hole, diapire 59.The relative main shaft 22 of each rib 56 of bearing bracket tilts, and makes the angle that forms less than 90 degree between the two.

The a pair of connecting

tube

60 and 62 that extends vertically is installed in two axial ends of housing 42.Described connecting

tube

60 and 62 has symplex structure, can be made by Shooting Technique by plastics.Both away from the end 61 and 63 of housing respectively as the entrance and exit of pump.Each connecting tube is cylindrical, increases gradually along its caliber of direction towards housing 42.Connecting tube is near the end 64 of housing 42 and the internal surface close-fitting of the penetration hole of housing 42, the outside one of 64 outer surface is extended with extension part 66 from the end, can extension part 66 be fixed to housing 42 by the screw (not shown), connecting tube and housing 42 are fixed.The connecting ring 58 of bearing bracket is located between the end 64 of corresponding stepped part 48 and connecting tube in the axial direction.Better, establish seal ring 70 between connecting ring 58 and end 64 and reveal to prevent fluid.

In the embodiment of the present invention, fluid is also sent from exporting 63 by spiral blade 30 pressurizations after entrance 61 enters pump chamber vertically.Due to connecting

tube

60,62 and the penetration hole of housing 42 all extend vertically, the kinetic energy rejection that fluid enters the pump housing is less, so the pump of the present embodiment has higher efficient.And, connecting

tube

60,62 simple in structure, can be made by Shooting Technique by plastics, so manufacturing process is simple, cost is lower.

The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.

Claims

1. volute pump, comprise rotor, with the magnetic-coupled stator of rotor and two connecting tubes of being located at stator two axial ends; Wherein, described rotor comprises main shaft, is fixed in the impeller with helix structure of main shaft and is fixed in the permanent magnet on impeller outer surface; Described stator comprises housing, stator core, be wound in the staor winding of stator core and be fixed in the two bearings support of housing two axial ends, described housing is provided with the penetration hole that extends vertically, described rotor is located in penetration hole, and described two bearings support supports respectively pair of bearings rotatably to support described main shaft.

2. volute pump according to claim 1, is characterized in that, described housing is overmolded onto on stator core and staor winding to seal described iron core and winding.

3. volute pump according to claim 1, is characterized in that, described connecting tube is made of plastics.

4. volute pump according to claim 1, is characterized in that, described permanent magnet is the plastic magnet of ring-type.

5. volute pump according to claim 1, is characterized in that, described impeller comprises the quill shaft that is overmolded onto on main shaft and the spiral blade that extends from the outer surface of quill shaft.

6. volute pump according to claim 1, it is characterized in that, each bearing bracket is formed from steel, some ribs that hub section, the loose boss section of comprising radially extends and the connecting ring that connects each rib tip, and the inboard bearing support block that forms of described hub section is with spring bearing.

7. volute pump according to claim 6, is characterized in that, the relative main shaft of described some ribs tilts.

8. volute pump according to claim 1, is characterized in that, two axial ends of described penetration hole are provided with two stepped part, and the internal surface close-fitting of each bearing bracket and penetration hole also is located between corresponding stepped part and connecting tube.

9. volute pump according to claim 1, is characterized in that, each connecting tube increases gradually along its caliber of direction towards housing.

10. volute pump according to claim 1, is characterized in that, each connecting tube is near the end of housing and the internal surface close-fitting of penetration hole, and the outside one of the outer surface of described end is extended with extension part, and described extension part is fixed to housing by screw.

11. volute pump according to claim 1 is characterized in that, is provided with seal ring between the end of each bearing bracket and the close housing of corresponding connecting tube.

12. a boiler hot circulatory system has the described volute pump of above arbitrary claim.