CN204436807U - A kind of centrifugal pump with shrouded impeller - Google Patents
A kind of centrifugal pump with shrouded impeller Download PDFInfo
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- CN204436807U CN204436807U CN201520023365.6U CN201520023365U CN204436807U CN 204436807 U CN204436807 U CN 204436807U CN 201520023365 U CN201520023365 U CN 201520023365U CN 204436807 U CN204436807 U CN 204436807U
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- impeller
- chimney
- spiral case
- fluid passage
- centrifugal pump
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Abstract
The utility model relates to a kind of centrifugal pump with shrouded impeller, belongs to pump technical field.A kind of centrifugal pump with shrouded impeller, comprise spiral case, impeller, impeller chimney, rotor shaft and back shroud, described rotor shaft is fixed on back shroud, impeller is fixed on rotor shaft, on impeller, cover has impeller chimney, described spiral case coordinates with back shroud and is housed in wherein by impeller, impeller chimney and rotor shaft, and the center of spiral case is provided with the fluid passage coaxial with impeller, together with the front end of described impeller chimney is nested in the rear end of fluid passage.Together with the front end of impeller chimney is nested in the rear end of fluid passage by the utility model, gap between the two can accurately control, thus make the leakage rate between water pump vane and spiral case reduce more than 80%, and this kind of structure allows there is loose gap between impeller and spiral case, reduce the frictional loss between impeller and fluid, also reduce the manufacture cost of Pump parts.
Description
Technical field
The utility model belongs to pump technical field, particularly the high efficiency centrifugal pump with shrouded impeller of one.
Background technique
Automobile motor in running can produce a large amount of heat, must be taken away by unnecessary heat by circulating cooling liquid.Centrifugal water pump constructional simplicity can be reliable, is widely used in heat dissipation circulating system.Wherein off-line water pump is divided into unshrouded impeller and double shrouded wheel two kinds.Double shrouded wheel efficiency is higher, but traditional double shrouded wheel is high to the clearance requirement between impeller chimney, spiral case, and the larger pump efficiency in gap is lower; The less efficiency in gap is higher, but can produce larger mechanical friction and fluid friction reduction pump efficiency to the gap that manufacture requirements is higher and too small.
Model utility content
The purpose of this utility model is for the problems referred to above, provides a kind of centrifugal pump with shrouded impeller, reaches high efficiency and reduces manufacture requirements simultaneously.
The purpose of this utility model is achieved in that
A kind of centrifugal pump with shrouded impeller, comprise spiral case, impeller, impeller chimney, rotor shaft and back shroud, described impeller is fixed on back shroud by rotor shaft is unsettled, on impeller, cover has impeller chimney, described spiral case coordinates with back shroud and is housed in wherein by impeller and impeller chimney, the center of spiral case is provided with the fluid passage coaxial with impeller, it is characterized in that, together with the front end of described impeller chimney is nested in the rear end of fluid passage.
Wherein, the front end of described impeller chimney is provided with the horizontal forward convex extension part stretched in fluid passage.
Wherein, the inwall of the rear end of described fluid passage has annular groove, the convex extension part of described impeller chimney is stretched in this annular groove.
Wherein, the gap between the external diameter of described convex extension part and annular groove inwall is not more than 0.2mm.
Wherein, the front end of described impeller chimney has through hole, and the rear end of described fluid passage is provided with level and stretches into bulge loop in this through hole backward.
The beneficial effects of the utility model are: together with being nested in the rear end of fluid passage the front end of impeller chimney, gap between the two can accurately control, thus make the leakage rate between water pump vane and spiral case reduce more than 80%, and this kind of structure allows there is loose gap between impeller and spiral case, reduce the frictional loss between impeller and fluid, also reduce the manufacture cost of Pump parts.
Accompanying drawing explanation
Fig. 1 is the internal structure schematic diagram of embodiment one.
Fig. 2 is the internal structure schematic diagram of embodiment two.
Embodiment
Below in conjunction with specific embodiments and the drawings, set forth the utility model further.
A kind of centrifugal pump with shrouded impeller, comprise spiral case 1, impeller 2, impeller chimney 3, rotor shaft 4 and back shroud 5, impeller 2 is fixed on back shroud 5 by rotor shaft 4 is unsettled, on impeller 2, cover has impeller chimney 3, spiral case 1 coordinates with back shroud 5 and is housed in wherein by impeller 2 and impeller chimney 3, the center of spiral case 1 is provided with the fluid passage 11 coaxial with impeller 2, together with the front end of impeller chimney 3 is nested in the rear end of fluid passage 11.
Embodiment one, as shown in Figure 1, the inwall of the rear end of fluid passage 11 has annular groove 12, the front end of impeller chimney 3 is provided with the horizontal forward convex extension part 11 stretched in annular groove 12, and the gap control between the external diameter of convex extension part 11 and annular groove 12 inwall is within 0.2mm, form a sealing strip, prevent the current of spiral case zone of high pressure from refunding water intake low pressure area, improve the efficiency of water pump.
Tradition double shrouded wheel does not have the annular groove of the convex extension part of impeller chimney front end and the rear end of fluid passage 11, raise the efficiency, can only by reducing the gap between impeller chimney front-end face and spiral case, but this can cause the velocity gradient of fluid between impeller and spiral case significantly to increase, the fluid friction resistance acting on impeller surface therewith velocity gradient is directly proportional, mechanical friction can occur in vane edge region, maximum apart from the moment overcome needed for friction farthest from rotating shaft herein.Adopt the method to improve the efficiency of water pump, greatly can improve the processing request of spiral case and impeller chimney, cause cost to increase.
In the present embodiment one, for solving above-mentioned contradiction, arranging convex extension part in impeller chimney front end inserts in the annular groove of the fluid passage of spiral case, and reflux fluid amount is determined by the gap smaller between the outer wall of the gap between the front-end face of impeller chimney except convex extension part and spiral case and convex extension part and the inwall of annular groove.Therefore, the gap between the front-end face of impeller chimney except convex extension part and spiral case can be very loose, reduce element precision requirement and scrappage, saving manufacture cost; And the gap between the outer wall of convex extension part and the inwall of annular groove can be very little, although border fluid friction or mechanical friction can be produced, but convex extension part and annular groove are very near spindle central, impeller chimney immediate vicinity linear resonance surface velocity is much smaller than edge, between impeller and spiral case, the velocity gradient of fluid is less, and the friction arm of force is also very little, therefore the resisting moment produced is much smaller than fringe region.Such structure solves the contradiction of impeller clearance and manufacture cost.
Embodiment two, as shown in Figure 2, through hole 22 is had in the front end of impeller chimney 3, the rear end of fluid passage 11 is provided with level and stretches into bulge loop 13 in this through hole 22 backward, gap between this through hole 22 and bulge loop 13 can be very little, form a sealing strip, prevent the current of spiral case zone of high pressure from refunding water intake low pressure area, improve the efficiency of water pump.Concrete principle is with embodiment one.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the purpose of this utility model is described, and be not used as restriction of the present utility model, as long as in essential scope of the present utility model, the change of the above embodiment, modification all will be dropped in the scope of claim of the present utility model.
Claims (5)
1. a centrifugal pump with shrouded impeller, comprise spiral case (1), impeller (2), impeller chimney (3), rotor shaft (4) and back shroud (5), described impeller (2) is fixed on back shroud (5) by rotor shaft (4) is unsettled, the upper cover of impeller (2) has impeller chimney (3), described spiral case (1) coordinates with back shroud (5) and is housed in wherein by impeller (2) and impeller chimney (3), the center of spiral case (1) is provided with the fluid passage (11) coaxial with impeller (2), it is characterized in that, together with the front end of described impeller chimney (3) is nested in the rear end of fluid passage (11).
2. centrifugal pump with shrouded impeller according to claim 1, is characterized in that, the front end of described impeller chimney (3) is provided with the horizontal forward convex extension part (11) stretched in fluid passage (11).
3. centrifugal pump with shrouded impeller according to claim 2, it is characterized in that, the inwall of the rear end of described fluid passage (11) has annular groove (12), the convex extension part (11) of described impeller chimney (3) is stretched in this annular groove (12).
4. centrifugal pump with shrouded impeller according to claim 3, is characterized in that, the gap between the external diameter of described convex extension part (11) and annular groove (12) inwall is not more than 0.2mm.
5. centrifugal pump with shrouded impeller according to claim 1, it is characterized in that, the front end of described impeller chimney (3) has through hole (22), and the rear end of described fluid passage (11) is provided with level and stretches into bulge loop (13) in this through hole (22) backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023365.6U CN204436807U (en) | 2015-01-14 | 2015-01-14 | A kind of centrifugal pump with shrouded impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023365.6U CN204436807U (en) | 2015-01-14 | 2015-01-14 | A kind of centrifugal pump with shrouded impeller |
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| Publication Number | Publication Date |
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| CN204436807U true CN204436807U (en) | 2015-07-01 |
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| CN201520023365.6U Active CN204436807U (en) | 2015-01-14 | 2015-01-14 | A kind of centrifugal pump with shrouded impeller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564692A (en) * | 2015-01-14 | 2015-04-29 | 上海新源动力有限公司 | Shrouded impeller centrifugal pump |
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2015
- 2015-01-14 CN CN201520023365.6U patent/CN204436807U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564692A (en) * | 2015-01-14 | 2015-04-29 | 上海新源动力有限公司 | Shrouded impeller centrifugal pump |
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