CN204961418U - Long -life starting drive and use its miniature drain pump - Google Patents

Abstract

The utility model discloses a long -life starting drive and use its miniature drain pump, this long -life starting drive is including the shaft coupling of connecting the motor shaft, from the shaft coupling lateral wall along radial convex start -up muscle, the holding has the impeller that holds the chamber of shaft coupling, inlay the yielding rubber in the impeller, the bottom that holds the chamber of impeller is provided with and is used for fixed the inlaying to put the cavity of yielding rubber, the protruding spacing muscle of lateral wall that holds the chamber of impeller spacing muscle and impeller hold the chamber lateral wall and follow between radial the impeller shaft is to seting up the arc recess, the yielding rubber inlays the dress and is in in the arc recess, the bottom installs in the cavity. The yielding rubber in a short time can not distortion, has promoted the life -span of yielding rubber, makes the life -span and the noise of the drain pump that adopts this yielding rubber obtain effectual improvement, can effectual reduction under the same condition of external force to the impact of impeller, whole motion process is more stable, has fine effect to the reliability that improves starting drive.

Description

A kind of long-life starting device and apply its micro-drainage pump

Technical field

The utility model relates to a kind of draining pump, and particularly a kind of Miniature centrifugal draining pump be mainly used on the household electric appliance such as washing machine, dishwasher, belongs to liquor pump field.

Background technique

Existing micro-drainage pump on the household electric appliance such as washing machine or dishwasher, because of the starting characteristic of motor, necessarily required sky stroke angles, and angle is larger, but startability is better., after certain idle stroke moment of torsion, rotor startup moment moment is comparatively large, and rotor coupling is very large to the power starting chamber yielding rubber repeated stock, causes yielding rubber cracked on the one hand, life of product is shorter, and when impacting, noise is large.

Such as in Chinese patent literature CN201428638Y, disclose a kind of long-life starting device of micro-drainage pump, comprise the metal coupling being provided with fan-shaped startup muscle and the plastic impeller and the snubber block that are provided with startup boss, snubber block is the fan-shaped integrated type snubber block of recessed waist, start boss and be two recessed waist both sides being located at snubber block respectively and corresponding with concave waist shape, the fan-shaped integrated type snubber block of described recessed waist is inserted between two startup boss.In this technological scheme, two startup boss one arrange impeller madial wall, one arranges impeller central, when rotating shaft drives coupling to rotate, starts the force analysis of structure as accompanying drawing 5,19,20, as seen from Figure 5, yielding rubber and coupling surface of contact bear whole impact forces, and the decomposition without other parts is born, and find out from Figure 19,20, the startup boss being arranged on impeller central when colliding after stressed synthesis all facing one direction, without other equilibrium of forces.Therefore, the position means of fixation in the program effectively can not balance outside to snubber block or the impact force starting boss, can cause snubber block torsional deformation for a long time, start boss cracked, reduce the reliability of starting mechanism.In addition, under this kind of structure, it is axially outstanding along coupling that coupling starts muscle, collides with yielding rubber, this startup muscle does not have the stressed strong point in wheel bottom, form cantilever, in movement process, have larger axis and radial play, motion is unstable, unstable with surface of contact between the two during yielding rubber making contact, unstable to yielding rubber impact force, cause its fatiguability broken, the life-span is short.

On the other hand, the installation reliability of coupling and motor shaft directly concerns the reliability of product, the technique that existing coupling and axle are riveted is substantially all that the mode such as cold metal interference riveted joint and plastics injection moulding is carried out, cold riveting is because being interference fit, coupling has cracking risk, adhesive strength is between the two also poor, and because material is metal, cost is also high; The technological forming of plastics injection moulding is good, and connect reliable, but manufacturing efficiency is low, cost of production is high.

In view of existing technology exists above-mentioned many defects, and in recent years, along with the aggravation of the increasing of manufacturer, market competition, the improving constantly of customer requirement, higher requirement is also proposed to product, therefore, be necessary that working out a kind of new technological scheme solves the problems of the technologies described above.

Model utility content

The purpose of this utility model is to provide a kind of scientific and reasonable for structure, and the life-span of yielding rubber is long, and noise obtains the long-life starting device effectively improved.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is, this long-life starting device, comprises the coupling connecting motor shaft; From the startup muscle that described coupling sidewall radially protrudes; There is the impeller of the receiving cavity of accommodating described coupling; Be embedded in the yielding rubber in described impeller, the bottom of the receiving cavity of described impeller is provided with the cavity for fixedly embedding described yielding rubber, projected side wall one limit rib of the receiving cavity of described impeller, along described impeller shaft to offering arc groove between described limit rib and impeller receiving cavity sidewall radial direction, described yielding rubber is inlaid in described groove, bottom is installed in described cavity.

In technique scheme, yielding rubber is embedded in described impeller, and namely yielding rubber is arranged in the receiving cavity of impeller, described wheel bottom is provided with cavity, the bottom of yielding rubber is installed in described cavity, adopt this structure, yielding rubber is able in the receiving cavity of impeller from fixed position, bottom, the startup muscle that described coupling sidewall radially protrudes, when the startup muscle of coupling impacts yielding rubber, for yielding rubber, along described impeller shaft to offering arc groove between described limit rib and impeller receiving cavity sidewall radial direction, described yielding rubber is inlaid in described groove, bottom is installed in described cavity, during this kind of structure disperses electric motor starting, coupling is to the impact force of impeller and yielding rubber, in a short time can not torsional deformation, improve the life-span of yielding rubber, the life-span of the draining pump of this yielding rubber of employing and noise are improved, can effectively reduce the impact to impeller under the condition that external force is identical, whole movement process is more stable, has good effect for the reliability improving starting drive.

Further improvement is, be installed to bottom described yielding rubber in described cavity for boss, described boss is installed in described cavity and forms mating part; Described coupling starts muscle and described mating part is axial without interfering; Boss is set bottom yielding rubber, and boss is installed in described cavity forms mating part, make yielding rubber position in receiving cavity more fixing, be more conducive to disperseing starting the impact force of muscle to impeller and yielding rubber.

Further improvement is, limit rib is divided into inner side limiting-position muscle, outside limit rib by described arc groove, and described inner side limiting-position muscle is greater than madial wall girth along described impeller radial outside wall girth; Arc groove is between inner side limiting-position muscle, outside limit rib, such structure makes yielding rubber embed therebetween, and be greater than madial wall girth along described impeller radial outside wall girth due to inner side limiting-position muscle, make the area of contact of itself and yielding rubber larger, more be conducive to yielding rubber is installed, and when starting muscle shock yielding rubber, oblique outer power formed to limit rib, with yielding rubber, the extruding force that limit rib is inside is balanced each other, reduce stressed to yielding rubber, life-saving.

Further improvement is, the receiving cavity bottom centre of described impeller offers the circular cavity holding described motor shaft, described limit rib, embeds described yielding rubber cavity in the outside of described circular cavity; This vibrational power flow arrangement makes enough spaces settle motor shaft, and when motor shaft rotates, motor shaft can not be formed with mating part interferes; This circular cavity is goed deep into after coupling assembles, the stressed strong point is had at this place, an other strong point is had in addition at impeller receiving cavity opening, a relatively existing strong point, stressed more stable, motion is more steady, start muscle and yielding rubber stress surface more stable, increase the working life of whole starting drive.

Further improvement is, described yielding rubber is made up of elastomer support and rubber body; Described rubber body is provided with hollow cavity vertically, and described rubber body is by described hollow cavity and the nested installation of described elastomer support.

When power of motor requires larger, the impact force of coupling to yielding rubber is stronger, above-mentioned yielding rubber structure by rubber body by described hollow cavity and the nested installation of described elastomer support, impact resistance is stronger, structure is more stable, in the larger situation of power of motor, longer working life can be maintained; Nested mode between elastomer support and rubber parts can be realized by quadric injection mould or post-cure.

Further improvement is, described elastic support includes filling block, is provided with the pedestal accepting described rubber body bottom described filling block, and what it is such that rubber body can be more stable is nestedly arranged on described elastomer support.

Further improvement is, described coupling is installed on described motor shaft by hot riveting mode, and described coupling is plastics coupling.

By taking to heat implanting device, heated by motor shaft, the mode then by being combined with the hot riveting of plastics coupling mesopore, is installed on coupling on motor shaft; After riveted joint, coupling does not ftracture, and because be hot riveting, motor shaft is combined closely with plastics coupling, and reliably, the advantages such as riveting quality is good, can effective Improving The Quality of Products, reduction production cost for intensity.

Further improvement is, described motor shaft and described coupling hot riveting position have hatching knurling, this structural design, makes to combine more closely during the two hot riveting, and riveting quality is better.

Another object of the present utility model is to provide a kind of scientific and reasonable for structure, relies on the life-span promoting yielding rubber, makes the life-span of draining pump and noise obtain the micro-drainage pump effectively improved.

For solving the problems of the technologies described above, the technological scheme of employing is: this micro-drainage pump comprises above-mentioned long-life starting device, also includes electric machine assembly and pump assembly; Described electric machine assembly includes stator, rotor and motor casing; The rotor chamber of water cavity and the described rotor of accommodation is provided with in described motor casing; Described pump assembly includes water pump shell, and described water pump shell is provided with the pump chamber holding impeller.

In technique scheme, when the startup muscle of coupling impacts yielding rubber, for yielding rubber, along described impeller shaft to offering arc groove between described limit rib and impeller receiving cavity sidewall radial direction, described yielding rubber is inlaid in described groove, bottom is installed in described cavity, during this kind of structure disperses electric motor starting, coupling is to the impact force of impeller and yielding rubber, in a short time can not torsional deformation, rely on the life-span promoting yielding rubber, the life-span of draining pump and noise are improved; Can effectively reduce the impact to impeller under the condition that external force is identical, whole movement process is more stable, has good effect for the reliability improving starting drive.

Further improvement is, the opening side of described water cavity and rotor chamber is provided with end cap; Described end cap is provided with through hole at the described water cavity opening of correspondence, and described pump chamber and described water cavity are communicated.

Further improvement is, the opening side of described water cavity and rotor chamber is provided with end cap; Described end cap is provided with through hole at the described water cavity opening of correspondence, and described pump chamber and described water cavity are communicated; Passable, described through hole is the circular aperture configuration arranged around described end cap central, and is arranged on the side near described end cap central.

The circular aperture configuration that end cap is offered at corresponding water cavity opening, by circular aperture configuration, the water cavity of pump chamber and motor casing is communicated, carry out the pressure of balance row water pump in half water half gas drainage procedure in water pump shell pump chamber, again because of draining pump operationally, impeller central pressure is less, outward pressure increases gradually, looping pit is near end cap central, while guarantee balance pressure, the efficiency that the leakage loss because of working pressure brings can be reduced reduce, reduce noise and the vibrations of draining pump with this structure, realize low noise, structure is simply scientific and reasonable.

Further improvement is, is provided with bearing in the bottom of described rotor chamber, and described bearing is provided with inner ring and outer ring, has annular muscle between described inner ring and outer ring; Described inner ring is connected with described annular muscle by two inner side muscle, and described outer ring is connected with described annular muscle by two outside muscle, makes to offer four holes around described inner ring and outer ring on the bearing.

Employing said structure is arranged, and bearing is sleeved on motor shaft by inner ring, makes bearing have the function of circumferential aligning, improves bearing structure, the noise reducing the vibrations in draining pump movement process further and therefore bring.

Further improvement is, described electric machine assembly includes heat protector, and the other end of the wire of described heat protector puts into the breach of terminal structure; Described terminal structure comprises base body, and described base body front end is provided with convergence piece, and the position that described base body is connected with described convergence piece is provided with clamp bar; Between the free end that described clamp bar is formed away from that one end of described base body and described base body, there is a breach.

Arrange clamp bar replace in existing terminal around columniation structure, change breach design into, wire directly can put into terminal breach, if notch size is less than wire diameter, then wire and terminal are interference fit, and namely terminal and wire adopt puncture type to be connected, if notch size is larger than wire diameter, wire for interval coordinates, adopts welding manner to connect with terminal after coordinating, the mode of welding can be soldering or focus welding; The advantages such as designed by terminal breach, wire directly can be put in terminal breach, does not need winding process, has reasonable in design, and part processing is simple, and complete machine packaging technology is ripe, welding quality is good, can effective Improving The Quality of Products, reduction production cost.

Accompanying drawing explanation

Fig. 1 is the sectional structure schematic diagram of the utility model micro-drainage pump;

Fig. 2 is the fitting configuration schematic diagram of the utility model micro-drainage pump;

Fig. 3 is the yielding rubber of long-life starting device in Fig. 2, coupling and impeller fitting configuration schematic diagram;

Fig. 4 is the startup chamber sectional view of impeller in Fig. 2;

Fig. 5 is existing coupling and yielding rubber stressed schematic diagram when bumping against;

Fig. 6 is stressed schematic diagram when coupling and yielding rubber bump against in the utility model;

Fig. 7 is the another kind of structural representation of yielding rubber in the utility model;

Fig. 8 is the equipped structural representation of yielding rubber in Fig. 7 and coupling, impeller;

Fig. 9 is coupling and motor shaft decomposing schematic representation;

Figure 10 is end cover structure schematic diagram;

Figure 11 is the structural representation that in Figure 10, end cap enters water place;

Figure 12 is the structural representation of bearing;

Figure 13 is terminal structure schematic diagram;

Figure 14 is the structural electromotor modular construction schematic diagram being provided with terminal in Figure 13;

Figure 15 is the close-up schematic view that the terminal of Figure 14 is connected with wire;

Figure 16 is the structure for amplifying schematic diagram of yielding rubber in Fig. 3;

Figure 17 is the plan view of impeller in Fig. 3;

Figure 18 is the structural representation that impeller in Figure 17 assembles yielding rubber;

Figure 19 is the force analysis figure that prior art Chinese patent literature CN201428638Y starts boss;

Figure 20 is the enlarged schematic partial view of Figure 19;

Figure 21 is the stressed exploded view starting muscle in Figure 18 impeller;

Figure 22 is the enlarged schematic partial view of Figure 21;

Wherein: 1-electric machine assembly; 101-stator; 102-rotor; 1021-motor shaft; 103-motor casing; 2-pump assembly; 201-water pump shell; 202-impeller; 2021,2022-cavity; 2023-limit rib; 20231-inner side limiting-position muscle; Limit rib outside 20232-; 2024-arc groove; 2025-receiving cavity; 2026-circular cavity; 3-water cavity; 4-rotor chamber; 5-pump chamber; 6-coupling; 601-starts muscle; 7,8-yielding rubber; 701,702,808,809-boss; 703,807-connecting sheet; 801-elastomer support; 802-rubber body; 803-hollow cavity; 804-filling block; 805,806-pedestal; 9-end cap; 901-through hole; 10-bearing; 1001-inner ring; 1002-outer ring; 1003-annular muscle; 1004, muscle inside 1005-; 1006, muscle outside 1007-; 11-terminal structure; 1101-base body; 1102-convergence piece; 1103-clamp bar; 1104-free end; 1105-breach; 12-heat protector.

Embodiment

As shown in Figure 1, micro-drainage pump of the present utility model includes long-life starting device, also includes electric machine assembly 1 and pump assembly 2; Described electric machine assembly 1 includes stator 101, rotor 102 and motor casing 103; The rotor chamber 4 of water cavity 3 and the described rotor 102 of accommodation is provided with in described motor casing 103; Described pump assembly 2 includes water pump shell 201, described water pump shell 201 be provided with hold impeller 202 pump chamber 5, Fig. 2 shown in be the fitting configuration schematic diagram of the utility model micro-drainage pump.

As shown in Figure 3,4, long-life starting device comprises the coupling 6 connecting motor shaft 1021; From the startup muscle 601 that described coupling 6 sidewall radially protrudes; There is the impeller 202 of the receiving cavity 2025 of accommodating described coupling 6; Be embedded in the yielding rubber 7 in described impeller 202, the bottom of the receiving cavity 2025 of described impeller 202 is provided with the cavity 2021,2022 for fixedly embedding described yielding rubber 7, projected side wall one limit rib 2023 of the receiving cavity 2025 of described impeller 202, between described limit rib 2023 and the receiving cavity 2025 sidewall radial direction of impeller 202, axially offer arc groove 2024 along described impeller 202, described yielding rubber 7 is inlaid in described arc groove 2024, bottom is installed in described cavity 2021,2022.

As shown in Figure 9, described coupling 6 is installed on described motor shaft 1021 by hot riveting mode, and described coupling 6 is plastics coupling, and motor shaft 1021 and coupling 6 hot riveting position have hatching knurling, can significantly find out from Fig. 9; Be provided with yielding rubber 7 in described impeller 202, be provided with cavity 2021,2022 bottom described impeller 202, described two cavitys 2021,2022 are separately positioned on limit rib 2023 both sides (as shown in Fig. 3,8) of impeller 202; The boss 701,702 matched with the cavity 2021,2022 of described impeller 202 is provided with bottom described yielding rubber 7, described boss 701,702 is installed in described cavity 2021,2022 and forms mating part, wherein boss 701 coordinates with cavity 2021, and boss 702 coordinates with cavity 2022; The startup muscle 601 of described coupling 6 is axial without interfering with described mating part.

As shown in Figure 17,18, limit rib 2023 is divided into inner side limiting-position muscle 20231, outside limit rib 20232 by the arc groove 2024 in above-mentioned Fig. 3, described inner side limiting-position muscle 20231 is greater than madial wall girth along described impeller 202 radial outside wall girth, receiving cavity 2025 bottom centre of described impeller 202 offers the circular cavity 2026 holding described motor shaft 1021, described limit rib 203, embeds the cavity 2021,2022 of described yielding rubber 7 in the outside of described circular cavity 2026.

Again as shown in figure 16, above-mentioned yielding rubber 7 has two boss 701,702, matches respectively with the cavity 2021,2022 of described impeller 202, and described two boss 701,702 are connected by connecting sheet 703; As can be seen from accompanying drawing 3 also, connecting sheet 703 in the utility model embodiment is thinner, match with arc groove 2024, the shape of described connecting sheet 703 is also arc, like this according to the fitting configuration in such as Fig. 3 carry out equipped after, connecting sheet 703 is fastened in arc groove 2024, whole yielding rubber is made to be close to the inwall of the receiving cavity 2025 of impeller 202, can significantly find out from Fig. 4, boss 701 is embedded in cavity 2021, and the startup muscle 601 of coupling 6 is axial without interfering with described mating part.

The yielding rubber 7 of said structure is adopted in the present embodiment, when the startup muscle 601 of coupling 6 impacts yielding rubber 7, impact with impact force F large equally, the active force that impeller 202 is subject to is different, as follows respectively: as in Fig. 5 (stressed schematic diagram when existing coupling and yielding rubber bump against), the stressed F1=F of limit rib 2023 of impeller 202, for in the utility model embodiment, as shown in Figure 6, F2+F3=F, the power that impeller 202 is subject to is F2 and F3, the power that wherein limit rib 2023 is subject to is F2, infer accordingly, F1 > F2, can judge thus, the structure of Fig. 6 can effectively reduce the impact of the limit rib 2023 to impeller 202 under the condition that external force is identical, because yielding rubber and startup muscle surface of contact exist active force and reaction force, therefore yielding rubber is stressed also less, whole movement process is more stable, for the reliability improving starting mechanism, there is good effect.

Moreover, as shown in Figure 19,20, be the force analysis figure that prior art Chinese patent literature CN201428638Y starts boss, as can be seen from Figure, when occurring that external force F acts on yielding rubber, owing to starting the structure of boss, to its directed force F 1 obliquely, F1x, F1y after decomposing, F1y is vertically upward, in addition owing to receiving the extruding force F2 upwards of yielding rubber, after synthesis, the power of Vertical direction is all upwards, overall stressed larger, easy to wear, the life-span is short; As shown in Figure 21,22, the stressed exploded view of limit rib in impeller in the utility model embodiment, when being subject to impact force, because its shape is become large from impeller central to outer perimeter, become fan-shaped, the stressed F1 direction of yielding rubber 7, inner side obliquely, the decomposition carrying out horizontal and vertical direction is F1x, F1y afterwards, and wherein vertical force direction is downward, and it is subject to the extruding force F2 upwards of yielding rubber in addition, wherein F2 can balance each other with F1y, and entirety is stressed to diminish.

One as the utility model above-mentioned yielding rubber 7 structure is out of shape, and can also be arranged to as shown in Figure 7,8 by yielding rubber, yielding rubber 8 is made up of elastomer support 801 and rubber body 802, described rubber body 802 is provided with hollow cavity 803 vertically, described rubber body 802 is by described hollow cavity 803 and the nested installation of described elastomer support 801, described elastic support 801 includes filling block 804, the pedestal 805 accepting described rubber body 802 is provided with bottom described filling block 804, 806, as can be seen from Figure 7, elastomer support 801 has two pedestals 805, 806, pedestal 805 lower end is provided with boss 808, pedestal 806 lower end is provided with boss 809, corresponding, in fig. 8, boss 808 cavity 2022 coordinates, boss 809 coordinates with cavity 2021, the distressed structure of this yielding rubber, by rubber body 802 by described hollow cavity 803 and the nested installation of described elastomer support 801, impact resistance is stronger, structure is more stable, in the larger situation of power of motor, longer working life can be maintained, concrete, the nested mode between elastomer support 801 and rubber body 802 can be realized by quadric injection mould or post-cure.

As shown in Figure 10, in micro-drainage pump of the present utility model, the opening side of described water cavity 3 and rotor chamber 4 is provided with end cap 9; Described end cap 9 is provided with through hole 901 at correspondence described water cavity 3 opening, described pump chamber 5 and described water cavity 3 are communicated, all can see from Fig. 9 and Figure 11, described through hole 901 is the circular aperture configuration arranged around described end cap 9 center, and is arranged on the side near described end cap 9 center.

Be provided with bearing 10 in the bottom of described rotor chamber 4, bearing 10 be movable set on described motor shaft 1021, as shown in figure 12, described bearing 10 is provided with inner ring 1001 and outer ring 1002, has annular muscle 1003 between described inner ring 1001 and outer ring 1002; Described inner ring 1001 is connected with described annular muscle 1003 by two inner side muscle 1004,1005, described outer ring 1002 is connected with described annular muscle 1003 by two outside muscle 1006,1007, makes to offer four holes around described inner ring 1001 and outer ring 1002 on the bearing; For inner side muscle 1005, outside muscle 1006, centered by described bearing 10 center line, the angle of described inner side muscle 1005 is 45 degree to 85 degree, the angle of described outside muscle 1006 is 20 degree to 40 degree, such vibrational power flow, the circumferential aligning function of bearing can be better met, the noise better reducing the vibrations in draining pump movement process and therefore bring; Concrete implication is, muscle both sides, inner side lead-in wire is to the center of bearing 10, and the angle between these two lines is 45 degree to 85 degree, outside muscle is also like this, and what its essence of this structure characteristic limited is the size in above-mentioned four holes, and inner side muscle 1005, outside muscle 1006 angle are large, then hole is just little, and vice versa.

As illustrated in figs. 13-15, the electric machine assembly 1 of the utility model micro-drainage pump includes heat protector 12, and the other end of the wire of described heat protector 12 puts into the breach 1105 of terminal structure 11; Described terminal structure 11 comprises base body 1101, and described base body 1101 front end is provided with convergence piece 1102, and the position that described base body 1101 is connected with described convergence piece 1102 is provided with clamp bar 1103; Between the free end 1104 that described clamp bar 1103 is formed away from that one end of described base body 1101 and described base body 1101, there is a breach 1105.

Described free end 1104 is in same level with described base body 1101, and, the outward edge of described free end 1104 is curved as can be seen from Figure 13,15 all (Figure 15 is the enlarged diagram in Figure 14 in dotted line circle); The inside edge of described breach 1105 is also curved, and convenient operation is assembled, and the inside edge of breach is also curved, mainly because wire and this contact position, inside edge are also curved, is convenient to coordinate wire to put into; In fig. 13, the upper surface of described convergence piece 1102 is provided with an oblique flange; The side of described convergence piece 1102 is also provided with indented ribs, the end-position place of described base body 1101 is provided with a circular hole, it is trapezoidal structure that described tail end restrains formation cross section in the middle of two side direction, oblique flange and indented ribs are set, make terminal structure tightr with the clamping of miscellaneous part secondary when mounted, be connected more firm.

Above-described specific embodiment; the object of model utility, technological scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of model utility; be not limited to the utility model; all within spirit of the present utility model and principle; any amendment of making, equivalent replacement, improvement etc.; such as, component shape in certain embodiment can adopt component shape in other embodiments and structure, all should be included within protection domain of the present utility model.

Claims (13)

1. a long-life starting device, is characterized in that, comprises the coupling connecting motor shaft; From the startup muscle that described coupling sidewall radially protrudes; There is the impeller of the receiving cavity of accommodating described coupling; Be embedded in the yielding rubber in described impeller, the bottom of the receiving cavity of described impeller is provided with the cavity for fixedly embedding described yielding rubber, projected side wall one limit rib of the receiving cavity of described impeller, along described impeller shaft to offering arc groove between described limit rib and impeller receiving cavity sidewall radial direction, described yielding rubber is inlaid in described arc groove, bottom is installed in described cavity.

2. long-life starting device according to claim 1, is characterized in that, be installed to bottom described yielding rubber in described cavity for boss, described boss is installed in described cavity and forms mating part; Described coupling starts muscle and described mating part is axial without interfering.

3. long-life starting device according to claim 1, is characterized in that, limit rib is divided into inner side limiting-position muscle, outside limit rib by described arc groove, and described inner side limiting-position muscle is greater than madial wall girth along described impeller radial outside wall girth.

4. long-life starting device according to claim 1, is characterized in that, the receiving cavity bottom centre of described impeller offers the circular cavity holding described motor shaft, described limit rib, embeds described yielding rubber cavity in the outside of described circular cavity.

5. long-life starting device according to claim 1, is characterized in that, described yielding rubber is made up of elastomer support and rubber body; Described rubber body is provided with hollow cavity vertically, and described rubber body is by described hollow cavity and the nested installation of described elastomer support.

6. long-life starting device according to claim 5, is characterized in that, described elastic support includes filling block, is provided with the pedestal accepting described rubber body bottom described filling block.

7. long-life starting device according to claim 1, is characterized in that, described coupling is installed on described motor shaft by hot riveting mode, and described coupling is plastics coupling.

8. long-life starting device according to claim 7, is characterized in that, described motor shaft and described coupling hot riveting position have hatching knurling.

9. a micro-drainage pump, is characterized in that, comprises the long-life starting device according to any one of aforementioned claim 1 ~ 8, also includes electric machine assembly and pump assembly; Described electric machine assembly includes stator, rotor and motor casing; The rotor chamber of water cavity and the described rotor of accommodation is provided with in described motor casing; Described pump assembly includes water pump shell, and described water pump shell is provided with the pump chamber holding impeller.

10. micro-drainage pump according to claim 9, is characterized in that, the opening side of described water cavity and rotor chamber is provided with end cap; Described end cap is provided with through hole at the described water cavity opening of correspondence, and described pump chamber and described water cavity are communicated.

11. micro-drainage pumps according to claim 10, is characterized in that, described through hole is the circular aperture configuration arranged around described end cap central, and are arranged on the side near described end cap central.

12. micro-drainage pumps according to claim 9, is characterized in that, are provided with bearing in the bottom of described rotor chamber, and described bearing is provided with inner ring and outer ring, have annular muscle between described inner ring and outer ring; Described inner ring is connected with described annular muscle by two inner side muscle, and described outer ring is connected with described annular muscle by two outside muscle, makes to offer four holes around described inner ring and outer ring on the bearing.

13. micro-drainage pumps according to claim 9, is characterized in that, described electric machine assembly includes heat protector, and the other end of the wire of described heat protector puts into the breach of terminal structure; Described terminal structure comprises base body, and described base body front end is provided with convergence piece, and the position that described base body is connected with described convergence piece is provided with clamp bar; Between the free end that described clamp bar is formed away from that one end of described base body and described base body, there is a breach.