CN102588328A

CN102588328A - Centrifugal pump

Info

Publication number: CN102588328A
Application number: CN2012100705588A
Authority: CN
Inventors: 王海波; 陈家潮; 黄厚清; 许智勇
Original assignee: GUANGDONG LINGXIAO PUMP INDUSTRY Co Ltd
Current assignee: GUANGDONG LINGXIAO PUMP INDUSTRY Co Ltd
Priority date: 2012-03-16
Filing date: 2012-03-16
Publication date: 2012-07-18

Abstract

The invention provides a centrifugal pump, comprising a pump shell, a pump cover, an impeller and a movable well ring, wherein the pump cover comprises a wall vertical to the rotating shaft of the impeller, and a water inlet is arranged on the wall; the impeller comprises a motor end for connecting with the motor and an impeller water inlet end close to the wall; the movable well ring is arranged between the impeller water inlet end and the wall, and the end part of the well ring, close to the wall, extends outwards along the axial direction to form into an annular boss; an annular groove is arranged on the external wall of the impeller water inlet end; an annular bulge is arranged on the inner wall of the movable well ring and is embedded in the annular groove; and the width of the annular groove in the axial direction is 2-3mm greater than that of the annular bulge in the axial direction. The centrifugal pump can prevent the neglect of the movable well ring duwell ring installation, and the installation efficiency is improved; moreover, the the tightness of the pump is improved, and the noise at the start of the pump is reduced.

Description

Centrifugal pump

Technical field

The present invention relates to a kind of centrifugal pump, especially with the centrifugal pump of self sealing structure impeller.

Background technique

At present, the centrifugal pump on the market in order to raise the efficiency, to reduce and leaks, and all on the cooperating structure between impeller and pump cover, puts forth effort to improve, and modal structure has two kinds.A kind of is to reduce the matching gap between impeller and the pump cover as much as possible; To reduce energy loss; Though this kind structure efficient compared with the cooperation in big gap promotes to some extent, has brought high difficulty to batch process, and part precision and assembly technology are all had high requirement; Otherwise be easy to the grazing between impeller and the pump cover occur, cause adverse consequences.Another kind of structure be between impeller and pump cover, load onto one can be along with current adjusting play, the movable choma that seals voluntarily.Like Fig. 1, Fig. 2 and shown in Figure 3, adopt the centrifugal pump of this structure to comprise motor 10 and pump main body 20, pump main body 20 mainly comprises pump case 21, pump cover 22, impeller 23 and movable choma 24.Pump case 21 is joined together to form a cavity with pump cover 22, is provided with impeller 23 in the cavity, the water intake 25 coaxial settings of impeller 23 and pump cover 22.Pump case 21 is provided with water outlet 26.Impeller 23 has with the motor side 231 that links to each other of axle of motor 10 with near the impeller feed-water end 232 of water intake 25.Pump cover 22 has a wall 221 perpendicular to impeller 23 running shafts; Between impeller feed-water end 232 and wall 221, be provided with movable choma 24; Movable choma 24 is made up of with annular boss 242 choma main body 241 cylindraceous; Annular boss 242 is formed on the end of choma main body 241 near wall 221, and extends radially outwardly along movable choma 24.Movable choma 24 is socketed in the outside of impeller feed-water end 232; Because the internal diameter of movable choma 24 is slightly larger than the external diameter of impeller feed-water end 232; So can endwisely slip along impeller feed-water end 232, simultaneously also can be with the axis of impeller 23 center under the drive of impeller along with rotation.

Fig. 2 and Fig. 3 have shown the working principle of activity collar extension 24 sealings.What Fig. 2 showed is the prestarting state of centrifugal pump.State when Fig. 3 starts back, waterflow stabilization for centrifugal pump; Current flow with the direction shown in the arrow among Fig. 3; After getting into water intake 25, flow to water outlet 26 through impeller 23, wherein a part of current enter in the plemum 27 that forms between impeller 23 and the pump cover 22; The positive pressure that these part current are produced is pushed movable choma 24 to wall 221 on the annular boss 242 of movable choma 24.Under the lasting thrust of current, movable choma 24 keeps tight contact the with wall 221 internal surfaces, thereby plays the effect of the slit a between sealing impeller feed-water end 232 and the wall 221.

The movable port loop technique can effectively reduce leakage, has solved the problem because of too small generation impeller in gap and pump cover grazing simultaneously, but following shortcoming is arranged:

One, goes wrong when needing repairing when product, in assembly process, omit movable choma easily, have a strong impact on the efficient of pump;

Two, since movable choma inwall and impeller feed-water end outer wall circumferentially between still have axially on straight-through slit, a part of water still can leak from this slit;

Three, owing to the positive stop lug boss of impeller feed-water end is far away from the distance of pump cover inwall, the sliding stroke of movable choma between pump cover inwall and positive stop lug boss is long, starts moment at centrifugal pump and can fiercely collide and produce great noise with the generation of pump cover inwall.

Summary of the invention

The purpose of this invention is to provide and to prevent that movable choma from omitting, the efficient of raising pump when assembling; While can further be improved the sealing of pump and reduced the centrifugal pump of pump startup moment noise.

For realizing above-mentioned purpose, centrifugal pump provided by the invention comprises pump case, pump cover, impeller and movable choma; Pump cover comprises the wall perpendicular to impeller rotating shaft, and wall is provided with water intake; Impeller comprises the motor side that is used for linking to each other with motor and near the impeller feed-water end of wall; Movable choma is arranged between impeller feed-water end and the wall, and its end near wall extends radially outward, and forms annular boss; Be formed with annular groove on the outer wall of impeller feed-water end; Be formed with annular projection on the inwall of movable choma; Annular projection is nested in the annular groove; Annular groove width in the axial direction is greater than annular projection width 2-3mm in the axial direction.

The centrifugal pump of technique scheme utilizes annular groove and the annular projection on the movable choma on the impeller to locate and the restraint choma, and movable choma and impeller are connected together, and has effectively prevented the problem of omission activity choma in the assembly process on the one hand; On the other hand, the cooperation of annular groove and annular projection has formed similar labyrinth seal, prevents that current from revealing between movable choma inwall and impeller feed-water end outer wall, further improves the sealing of centrifugal pump; On the one hand, movable choma stroke in the axial direction is merely the 2-3 millimeter again, and existing relatively centrifugal pump stroke greatly reduces, and can effectively reduce noise.

The present invention also provides a kind of centrifugal pump, and its impeller is combined by impeller leading portion and impeller back segment, and annular groove is positioned at the joint of impeller leading portion and impeller back segment.

The present invention also provides a kind of centrifugal pump, and the Placement between its impeller leading portion and the impeller back segment is welding or bonding or be threaded.

The annular groove of technique scheme is to be formed by connecting two-part part, can in manufacture process, be inserted in movable choma earlier; Again two-part are fused; The annular projection of movable choma is socketed in the middle of the annular groove, reduces manufacture difficulty, enhance productivity.

The present invention also provides a kind of centrifugal pump, its annular groove diametrically the degree of depth greater than the height diametrically of annular projection.

The slip of this design assurance activity choma is more smooth and easy, also can better form labyrinth seal simultaneously.

Description of drawings

Fig. 1 is the phantom of existing technology centrifugal pump;

Fig. 2 is the p partial enlarged drawing among Fig. 1, shown centrifugal pump start before the state of movable choma;

Fig. 3 is the p partial enlarged drawing among Fig. 1, shown that centrifugal pump starts after, during waterflow stabilization, the state of movable choma;

Fig. 4 is the sectional view of embodiment of the invention impeller and movable choma;

Fig. 5 is the enlarged view of the centrifugal pump movable port loop section of the embodiment of the invention, shown after startup, and during waterflow stabilization, the state of movable choma.

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Embodiment

Because centrifugal pump embodiment's of the present invention main structure is identical with existing centrifugal pump, only the present invention is stressed the improvement part of existing centrifugal pump at present.

Embodiment such as Fig. 4 and shown in Figure 5, in this example, impeller 40 is formed by connecting impeller leading portion 41 and impeller back segment 42, comprises the motor side 43 that links to each other with motor shaft and the impeller feed-water end 44 of current entering impeller 40.Impeller leading portion 41 is near impeller feed-water end 44, and impeller back segment 42 is near motor side 43.Impeller leading portion 41 is similar L shaped along the section of axis, comprises a main body cylindraceous 411 and the boss 412 that extends radially outwardly, and the end face of main body 411 is connected with the end face of impeller back segment 42, Placement can for weld, bonding or be threaded.Impeller leading portion 41 forms annular groove 45 with after impeller back segment 42 is connected on the outer wall of impeller feed-water end 44, it is smooth that the outer surface of annular groove 45 should keep, and promptly sees on the whole, and the outer surface of the cylindrical wall of impeller feed-water end 44 is smooth smooth.Movable choma 30 is socketed in the cylindrical wall outside of impeller feed-water end 44, and annular projection 33 is nested in the annular groove 45, and movable choma 30 can not deviate from from impeller feed-water end 44.The internal diameter of movable choma 30 is slightly larger than the external diameter of impeller feed-water end 44, and therefore, movable choma 30 impeller feed-water end 44 relatively slides in the axial direction, also can rotate with impeller 40, adjusts both gaps automatically.Movable choma 30 comprises choma main body 31 cylindraceous, the annular boss 32 that bead ring main body 31 extends radially outwardly, and be formed on the roughly annular projection 33 that extends radially inwardly of the bead ring main body 31 in neutral position of choma main body 31.Annular projection 33 is nested in the annular groove 45.Since annular groove 45 at the impeller 40 width b on axially greater than annular projection 33 at the width a of impeller 40 on axially, therefore, movable choma 30 impeller feed-water end 44 relatively slides in the axial direction.

Because impeller leading portion 41 is two independent parts with impeller back segment 42, when making impeller 40, can be earlier the annular projection 33 of movable choma 30 be socketed on the main body 411 of impeller leading portion 41, again impeller back segment 42 and impeller leading portion 41 are linked together; After the connection, the outer surface of main body 411 just becomes the bottom surface of annular groove 45, and annular projection 33 also just has been socketed in the annular groove 45 naturally, and movable choma 30 also just connects together with impeller 40.Such impeller manufacture can effectively be avoided losing and neglected loading of movable choma in the assembling of centrifugal pump or maintenance process, improve the efficient of centrifugal pump.

In other embodiments; Annular groove also can not be to be connected to form through two parts; But directly in the impeller casting process, form; Perhaps reprocessing forms on integrated impeller, though the annular groove that these modes form is unfavorable for the assembling of movable choma, can realize goal of the invention equally.

In order not allow annular groove 45 to influence the sealability of activity choma 30; The position of the annular groove 45 of present embodiment and the setting of axial width should be satisfied following requirement: promptly after centrifugal pump starts; During waterflow stabilization; The annular boss 32 of movable choma 30 moves to the right-hand of Fig. 5, can conflict on wall 221, and annular projection 33 can not stopped by the cell wall of annular groove 45.

The radial depth of annular groove 45 is greater than the radial height of annular projection 33; But should can from annular groove 45, not deviate to exceed to guarantee annular projection 33; The outer wall that so movable choma 30 can be close to impeller feed-water end 44 slides; It is more smooth and easy not only to slide, and can between movable choma 30 inwalls and impeller feed-water end 44 outer walls, form labyrinth seal, guarantees sealability.In other embodiments; The radial depth of annular groove also can be less than the radial height of annular projection; Conflict on the bottom surface of annular groove in the top of annular projection like this; The slip that makes movable choma mainly is to rely on the slip of top on the annular groove bottom surface of annular projection to realize, though the slit between movable choma inwall and the impeller feed-water end is bigger than normal relatively, so also can realize labyrinth seal; But because the area of contact of top on the annular groove bottom surface of annular projection is less, the problem of may generation activity choma sliding and having some setbacks.

Noise when starting in order to reduce centrifugal pump, the axial width of annular groove can be arranged to 2 to 3 millimeters, makes the stroke of the existing relatively movable choma of stroke that endwisely slips of movable choma greatly reduce the noise when reducing with the collision of pump cover wall.

More than be to various embodiments of the present invention and the explanation carried out around embodiment's dependency structure conversion.

Claims

1. centrifugal pump comprises pump case, pump cover, impeller and movable choma;

Said pump cover comprises the wall perpendicular to said impeller rotating shaft, and said wall is provided with water intake;

Said impeller comprises the motor side that is used for linking to each other with motor and near the impeller feed-water end of said wall;

Said movable choma is arranged between said impeller feed-water end and the said wall, and its end near said wall extends radially outward, and forms annular boss;

It is characterized in that:

Be formed with annular groove on the outer wall of said impeller feed-water end;

Be formed with annular projection on the inwall of said movable choma;

Said annular projection is nested in the said annular groove;

Said annular groove width in the axial direction is greater than said annular projection width 2-3mm in the axial direction.

2. centrifugal pump according to claim 1 is characterized in that:

Said impeller is combined by impeller leading portion and impeller back segment, and said annular groove is positioned at the joint of said impeller leading portion and said impeller back segment.

3. centrifugal pump according to claim 2 is characterized in that:

Placement between said impeller leading portion and the said impeller back segment is welding or bonding or be threaded.

4. according to each described centrifugal pump of claim 1 to 3, it is characterized in that:

The said annular groove degree of depth diametrically is greater than said annular projection height diametrically.