CN105849413A - Drainage pump - Google Patents

Abstract

A drainage pump which has a pump rotor (12), the pump rotor (12) being configured by including: a plurality of tandem protrusion pieces (20ai) that constitute an agitator body for applying centrifugal force to fluid; protrusion pieces (20bi); an annular outer wall (12PW) that surrounds the periphery of the plurality of protrusion pieces (20ai) adjacent thereto; and a truncated cone-shaped supporting plate (12A) integrally formed with the lower ends of the protrusion pieces (20ai) and lower ends of the outer wall (12PW) and the protrusion pieces (20bi), the supporting plate (12A) having a lower end with a shaft portion (12B) inserted into a suction opening (10a).

Description

Draining pump

Technical field

The present invention relates to the draining pump with pump rotor.

Background technology

In air-conditioning equipment, it is provided with the externally discharged draining pumps such as water by being trapped in drip tray.For row Water pump, such as, as shown in patent documentation 1 and patent documentation 2, as staple, including: lower house (being referred to as cover body in patent documentation 1 and patent documentation 2), it has formation suction inlet in central part lower end Suction tube；Rotor, it can be arranged in the rotor receiving room of lower house rotationally；Upper shell is (specially Profit document 1 and patent documentation 2 are referred to as lid), its inner peripheral portion forming lower house and rotor receiving room (pump Room)；And driving motor, it is supported on upper shell and is driven rotor.

The inner peripheral portion of lower house is formed as extending in funnel-form centered by suction inlet.One end of its suction inlet is joined It is placed in drip tray.Thus, in the case of rotor described below is set to duty, by water receiving Water in dish etc. import rotor receiving room.It addition, at the sidewall of lower house, outlet along with in suction inlet The direction of heart orthogonal axe extends.The outlet discharged by fluid in rotor receiving room turns due to lower house Minor diameter part and the large-diameter portion of the connection of sub-receiving room are constituted.

The cylindrical portion formed in the lower end of upper shell is via the opening of O Yu the upper end of lower house End connects.At the peripheral portion of the base plate of upper shell, such as, as shown in patent documentation 1 and patent documentation 2, The noise caused by the bubble of outlet sometimes for reduction, the partition wall of tubular is arranged towards lower house Diapire highlight.Thus, between the sidewall and partition wall of lower house, it is formed with gap.It addition, by being somebody's turn to do Ring-type gap directs fluid to outlet.Now, by above-mentioned partition wall suppression by the top of pump chamber The bubble at edge guides to outlet, therefore, reduces the noise caused by the bubble of outlet.

Rotor includes: circular cone shape portion, and it has, in lower end, the axle portion inserted in suction inlet；And multiple pin, It is integrally formed with circular cone shape portion.

The sleeve member of the output shaft connecting driving motor it is configured with in the hole of the central part in circular cone shape portion. Multiple pins are respectively provided with four-prism shape.As shown in the Fig. 8 in patent documentation 2, respectively sell in circular cone shape portion Circumferentia and each intercommunicating pore adjacent and central axis of along sleeve member is arranged.Multiple pins are in sleeve member Around arrange the most in length and breadth.By so arranging multiple pins, the generation of suppression cavitation, therefore Reduce by the noise caused by cavitation.

In this composition, in the case of rotating rotor, such as, it is high-lift at draining pump, and output During minimizing, owing to acting on the fluid sucked from suction inlet from the high back pressure of outlet side, therefore sucking Fluid included in air layer can be stranded in the surface, i.e. in above-mentioned hole, than inner side multiple pins more Near the sleeve member of rotor in the inner part.

On the other hand, in the case of rotating rotor, such as, it is low lift at draining pump, and output increases Time big, act on the back pressure from outlet side from the fluid of suction inlet suction and diminish than time high-lift, because of This air layer included in the fluid sucked gradually spreads out upward from the position directly above in hole.That is, make Liquid-gas boundary for the boundary face of liquid-to-air moves towards being positioned at outermost multiple pin.Thus, expand Air section.

As it has been described above, in draining pump, when draining pump is low lift, sometimes due to air section expand and Air layer and fluid liquid level mixing, being positioned in multiple pins compare pin in the outer part near generation gas Bubble.In this case, the relative velocity being positioned at multiple pins and the liquid-gas boundary face compared in the outer part accelerates, The plurality of pin increases with the contact area in liquid-gas boundary face, produces so-called, acoustic ratio of striking draining the most therewith Pump is the problem that high-lift time-varying is big.

Produce so that the sound pressure level of sound of striking reduces, such as, such as patent literary composition in order to suppress bubble in pump chamber Offer shown in 3, it is proposed that impeller has draining collector ring and the technology of draining guide part.Utilize this draining The effect of collector ring, extends to the Free Surface outside radial direction and is not stirred by blade periphery due to centrifugal force Mix, therefore suppress the generation of bubble.It addition, for the generation suppressing the bubble in pump chamber, such as, as specially Shown in profit document 4, it was also proposed that rotating vane integrally has the outer shroud in the maximum diameter portion surrounding vane plate.Logical Cross and outer shroud is so set, it is ensured that liquid level is uniform with the boundary face of air layer, and therefore the generation of bubble tails off.

Prior art literature

Patent documentation

Patent documentation 1: No. 3723556 publications of Japanese Patent No.

Patent documentation 2: No. 4680922 publications of Japanese Patent No.

Patent documentation 3: No. 3511044 publications of Japanese Patent No.

Patent documentation 4: No. 3254325 publications of Japanese Patent No.

Summary of the invention

In draining pump size, wish to improve the degree of freedom of the configuration of draining pump the most in design Improve discharge capacity.In the case of Gai, along with the change of specified point, need to improve further the rotor of draining pump Maximum (top) speed, therefore, particularly when low lift, constitute the problem of rising of the sound pressure level of sound of striking.

Consider above problem points, the purpose of the present invention to provide a kind of draining pump with pump rotor, its In the case of improve drainability, even if when low lift, it is also possible to reduce by caused by pump rotor Strike the sound pressure level of sound.

To achieve these goals, the draining pump of the present invention includes: pump case, and it has suction inlet and discharge Mouthful；And pump rotor, it can be configured in the rotor receiving room of pump case rotatably, and said pump turns Son has: opening, and its fluid imported for use by suction inlet passes through；Support plate, its shape at a predetermined interval Becoming multiple projection tab, multiple projection tab are when support plate is rotated by rotary drive mechanism, to by opening And the fluid imported applies centrifugal force；And ring-type outer wall, it is supported in support plate, and surrounds multiple prominent Play the outermost arrangement of the radial direction along support plate in sheet.It addition, the stream imported by suction inlet Body, after mutual by multiple projection tab, crossed outer wall and is flowed out to above-mentioned outlet.

According to the draining pump of the present invention, what pump rotor had that the fluid imported for use by suction inlet passes through opens Mouthful, form the supporting of multiple projection tab that the fluid that imported by opening is applied centrifugal force at a predetermined interval Plate and be supported on support plate and by the outermost row of the radial direction along support plate in multiple projection tab The ring-type outer wall that row surround, thus rippling by multiple projection tab suppression fluid, simultaneously by outer wall pair Fluid carries out rectification, therefore in the case of improve the drainability of draining pump, even if when low lift, It also is able to reduce by the sound pressure level of the sound of striking caused by pump rotor.

Accompanying drawing explanation

Fig. 1 is the axonometric chart representing the pump rotor used in an example of the draining pump of the present invention.

Fig. 2 be the pith of an example of the draining pump of the present invention is ruptured be indicated schematic Structure chart.

Fig. 3 is in the illustrated example shown in fig. 2, the plane graph being indicated with the state after being unloaded by upper shell.

Fig. 4 is the partial sectional view that IV-IV line is indicated along Fig. 3.

Fig. 5 is that the V portion of Fig. 4 is amplified the partial enlarged drawing being indicated.

Fig. 6 A is the axonometric chart of the pump rotor representing comparative example.

Fig. 6 B is the axonometric chart of the pump rotor representing comparative example.

Fig. 6 C is the axonometric chart of the pump rotor representing comparative example.

Fig. 7 is the figure of the performance test of an example of the draining pump for the present invention is described.

Fig. 8 is the spy of the sound pressure level of the noise of an example of the draining pump representing the present invention and each comparative example The performance plot of property.

Detailed description of the invention

Fig. 2 represents the structure of an example of the draining pump of the present invention.

In fig. 2, as main key element, draining pump possesses: lower house 10, and it is in central part lower end There is the suction tube forming suction inlet 10a；Pump rotor 12, it can be arranged in lower house 10 rotationally； Upper shell 14, it together forms rotor receiving room with the inner peripheral portion of lower house 10；And driving motor 15, It is configured at upper shell 14 and is driven pump rotor 12.

One end of the suction inlet 10a of lower house 10 such as, is configured at drip tray DP (with reference to Fig. 7).Under The inner peripheral portion of housing 10 is formed as extending in funnel-form centered by suction inlet 10a.It addition, such as Fig. 2 and Shown in Fig. 3, in the outlet side described below of upper portion side wall 10US of lower house 10, outlet 10D Extend along the direction orthogonal with the central axis of suction inlet 10a.Outlet 10D by with lower house 10 turn The minor diameter part 10b and large-diameter portion 10c of the connection of sub-receiving room are constituted.

The cylindrical portion formed in the lower end of upper shell 14 is via the upper end of O 18 with lower house 10 The opening in portion connects.It is inserted with output shaft 15S and pump rotor 12 described below at through hole 14a Sleeve member 22, through hole 14a is formed at the central authorities of the par 14W of the cylindrical portion of upper shell 14 Portion, and connect with in rotor receiving room (hereinafter also referred to pump chamber).Thus, pump case is by lower house 10 And upper shell 14 is formed.

Driving motor 15 is such as set to platypelloid type DC brushless electric machine, and is supported on upper shell 14 Top.It addition, the rotating speed of the output shaft 15S of driving motor 15 passes through not shown according to delivery flow Panel is controlled.It addition, although it is not shown, but upper shell 14 has air communication hole in many places. Additionally, driving motor 15 is not limited to this example, it is also possible to for the AC motor of rotating speed, example can be controlled As, shaded-pole motor with encoder.It is provided with bracket for mounting 16 on the top of driving motor 15.

As shown in Figures 1 and 3, pump rotor 12 is such as integrally formed by resin material, and includes: many Individual series connection projection tab 20ai (i=1～52), it constitutes convection cell and applies the stirring body of centrifugal force；Ring-type outer wall 12PW, it is adjacent with the surrounding of multiple projection tab 20ai and surrounds；Projection tab 20bi (i=1～20), It is integrally formed with outer wall 12PW；The support plate 12A of circular cone shape, it has insertion suction inlet in lower end Axle portion 12B in 10a, and with the lower end of projection tab 20ai and outer wall 12PW and the lower end of projection tab 20bi It is integrally formed.Resin material for example, the transparency resin material or black, white resin material, Or can also be the resin material being mixed with other color.

Support plate 12A has, in lower center portion, the axle portion 12B inserted in suction inlet 10a.Axle portion 12B There is cross projection 12b extended along central axis.

As it is shown on figure 3, the through hole 12a of central part of the support plate 12A at the diameter with about 41mm It is configured with the sleeve member 22 that the output shaft 15S with driving motor 15 is connected.Sleeve member 22 one It is formed on the central axis common with the central axis of axle portion 12B, and with by above-mentioned through hole 14a Through mode highlights.That is, the bearing-surface that sleeve member 22 is formed as relative to support plate 12A is the most vertical Directly.Sleeve member 22 is by through with as opening of connecting piece 12R1,12R2,12R3 and 12R4 The edge of hole 12a links.Connecting piece 12R1～12R4 respectively along its circumferencial direction to be uniformly spaced apart in everywhere Branch, and be integrally formed with the end of axle portion 12B.Additionally, the quantity of connecting piece is not limited to this example, For example, it is also possible to arrange more than less than three, or five.

For 52 projection tab 20ai, such as, resin material it is integrally formed with support plate 12A, and There is the rectangular section of the length of side about 1.8mm.Projection tab 20ai is in the week of the through hole 12a of support plate 12A Enclose and formed the most in length and breadth.For the arrangement of projection tab 20ai, such as, as it is shown on figure 3, Include the substantially rectangular first order as benchmark near the position near through hole 12a, it is with in advance Fixed being spaced on a limit has seven.It addition, to be formed around in the way of the similar shape of first order Form second order.Second order on the direction away from through hole 12a with the first order as benchmark Each projection tab 20ai is face-to-face, is formed by seven projection tab 20ai on a limit.Now, second order Be formed as, with projection tab 20ai at the angle on each limit as first order relative to two projection tab 20ai become For with the inner peripheral surface of ring-type outer wall 12PW described below relative to adjoining position.And, as the 3rd Projection tab 20bi of arrangement is formed respectively in the way of relative with projection tab 20ai on each limit of the second assortment. Each limit of the 3rd arrangement is formed with 5 projection tab 20bi at a predetermined interval.Each projection tab 20bi is relative to Two arrangement each limits abreast on the direction away from through hole 12a at predetermined intervals along outer wall 12PW's Inner peripheral surface is integrally formed.Thus, the slit-shaped mutual by projection tab 20bi and adjacent projection tab 20bi Become is concavo-convex relative with each limit of second order, forms predetermined length in a circumferential direction.

In first order and second order, as shown in Figure 4, the length along axis of each projection tab 20ai In the way of the position, the top of projection tab 20ai is positioned in common plane respectively different, and along with towards Outer wall 12PW and shorten.The average length along axis of each projection tab 20ai is such as 5～10mm.Prominent Rise and be formed between the top of sheet 20ai and the face of the opposed with pump chamber of the par 14W of upper shell 14 Predetermined gap.It addition, in the outer peripheral face of outer wall 12PW of pump rotor 12 and the upper side of lower house 10 Predetermined gap it is formed with between the inner peripheral surface of wall 10US.The length along axis of each projection tab 20bi sets For the same length along axis with the shortest projection tab 20ai, or than the shortest projection tab 20ai The length along axis little.The position of the upper end of outer wall 12PW is in the upper end with each projection tab 20bi altogether In same plane.

Although additionally, the first order as benchmark is formed as rectangle, but also need not so arrange, such as, Can also, the first order as benchmark is formed as circular, and second order, the 3rd arrangement are somebody's turn to do to be formed to imitate As the mode of similar shape of the first order of benchmark, formed with predetermined uniform intervals.

Thus, in the case of driving motor 15 is duty, produced by the pump rotor 12 rotated Centrifugal force, in fig. 2, by along the direction shown in arrow by the fluid that sucks from suction inlet 10a through through Space that the inner peripheral portion that hole 12a guides to the lower end by the inner peripheral portion of lower house 10 and upper shell 14 is formed, I.e. rotor receiving room, and by minor diameter part 10b and large-diameter portion 10c, outside being discharged to along the direction described in arrow Portion.Additionally, the direction of rotation of the pump rotor 12 determined by driving motor 15 can be clockwise and Any direction in Ni Shizhenfangxiang.

In this composition, by controlling the driving rotating speed of the output shaft of motor 15, controlling pump rotor 12 Rotating speed in the case of, such as, when the low lift of about 150mm, as shown in Figure 4, by inhale The inner side of the annular liquid side of the fluid that entrance 10a and through hole 12a is sucked, by through air connectivity hole (not Diagram) and through hole 14a border invade liquid-gas boundary face BP air formed gas phase APH.Through gas-liquid Boundary face BP, the surrounding in gas phase APH forms liquid phase LPH.Liquid-gas boundary face BP is by work Pump rotor 12 produce centrifugal force with from outlet water load and by caused by centrifugal force from lower casing The balance of the counteracting force of the inner peripheral portion of body 10 and formed.

Thus, the liquid in rotor receiving room guided by centrifugal force to lower house 10 inner peripheral portion and on The inner peripheral portion of the lower end of housing 14, and by minor diameter part 10b and large-diameter portion 10c along the arrow shown in Fig. 5 The path that F represents is discharged to the outside.Therefore, it is possible to suppress liquid-gas boundary face further by outer wall 12PW BP moves to the inner peripheral surface of upper portion side wall 10US of lower house 10, and suppresses produced bubble impact The speed of upper portion side wall 10US of lower house 10.It addition, in the outflow path of liquid, utilize outer wall The rectified action of 12PW also is able to suppress the generation of spiral vortex.And, by multiple projection tab 20ai And 20bi, it is also possible to ripple (fluctuating) of suppression liquid produces.

An example of draining pump of the present invention, i.e. shown in Fig. 2 a example is used (hereinafter also referred to arrange Water pump A) come comparison comparative example described below 1, comparative example 2 and comparative example 3 and pump rotor 12, figure 8 represent the result that the reducing effect to the sound pressure level (logarithm noise) of above-mentioned pump rotor 12 is verified.

Draining pump A includes that pump rotor 12 is constituted, and pump rotor 12 has the support plate of diameter about 41mm 12A and outer wall 12PW.Support plate 12A has 52 projection tab 20ai of length of side 1.8mm and with outward Integral part of 20 projection tab 20bi of wall 12PW.The distance setting that adjacent projection tab 20ai is mutual For, such as, 1.5mm.

In this experiment, at the lift of draining pump A from the low lift of water load (lift) about 150mm Be changed to about water load 1200mm high-lift time, measure the sound sent from draining pump A.

Additionally, the zero point setting of above-mentioned lift is to be zero and in poised state at the flow of draining pump A Time, at a distance of the liquid level position (ginseng of suction inlet end predetermined distance De (about 10mm) lower section of draining pump A According to Fig. 7).

It addition, using as shown in existing product, Fig. 6 A, 6B and 6C, shape mutually to difference Pump rotor 32 (comparing 1 example), pump rotor 34 (comparative example 2), pump rotor 36 (comparative example 3) peace When being loaded on draining pump A, as it is shown in fig. 7, the sound sent respectively is measured.The sound profit sent With away from suction inlet separation preset distance Le, such as, the acoustic meter in the silencer box of about 500mm is (little Wild survey device (strain) society system: LA5120), A characteristic, low in the range of be measured.Outlet and pipe arrangement The draining pump A that Du connects remains suction inlet and is configured at and fully loaded has water level De, such as, about 10mm In the drip tray DP of the liquid of above degree of depth Dmax.The method of this experiment is carried out as follows, and passes through The change in location of the one end of the pipe arrangement Du being connected with the outlet of draining pump A is made to make lift change, Under arbitrary lift when the state that the discharge becoming water stops, so-called poised state, utilize acoustic meter The sound sent near outlet is measured.

Pump rotor 32 (comparative example 1), pump rotor 34 (comparative example 2), pump rotor 36 (comparative example 3) Diameter is identical with the diameter of pump rotor 12 respectively.

As shown in Figure 6A, pump rotor 32 is such as integrally formed by resin material, and it has in common that have Such as multiple series connection projection tab 30ai (i=1～52) and projection tab 30bi (i=1～20) of pump rotor 12, difference Point is not such as the ring-type outer wall of pump rotor 12.Pump rotor 32 includes: multiple series connection projection tab 30ai And 30bi, it constitutes convection cell and applies the stirring body of centrifugal force；And the support plate 32A of circular cone shape, its There is the axle portion 32B inserted in suction inlet 10a in lower end, and with projection tab 30ai and the lower end of 30bi It is integrally formed.

Support plate 32A has, in lower end, the axle portion 32B inserted in above-mentioned suction inlet 10a.Axle portion 32B There is criss-cross projection 32b extended along central axis.

It is configured with the output shaft 15S with driving motor 15 at the through hole 32a of the central part of support plate 32A The sleeve member 42 connected.Sleeve member 42 is on the central axis common with the central axis of axle portion 32B It is integrally formed, and prominent in the way of through above-mentioned through hole 14a.That is, sleeve member 42 is formed as phase Bearing-surface for support plate 32A is substantially vertical.Sleeve member 42 by connecting piece 32R1,32R2, The edge of 32R3 and 32R4 and through hole 32a links.Connecting piece 32R1～32R4 are respectively along its circumference side To be uniformly spaced apart in branch everywhere, and it is integrally formed with the end of axle portion 12B.Additionally, in fig. 6, Not shown connecting piece 32R2,32R3.

Projection tab 30ai is such as integrally formed with support plate 32A by resin material, and has the length of side about 1.8mm Rectangular section.Projection tab 30ai around the through hole 32a of support plate 32A the most in length and breadth Ground is formed.As shown in Figure 6A, mutual in adjacent projection tab 30ai, it is formed with connection in precalculated position Hole 32C.Two projection tab 30bi being positioned at two ends in five projection tab 30bi respectively with other projection tab 30bi and projection tab 30ai are different, and its diagonal angle has carried out chamfering.

As shown in Figure 6B, pump rotor 34 is such as integrally formed by resin material, and it has in common that to have Just like the ring-type outer wall of pump rotor 12, difference is not such as multiple series connection projection tab of pump rotor 12 20ai (i=1～52) and 20bi (i=1～20).Pump rotor 34 includes: multiple vane plate 40A, 40B, It constitutes convection cell and applies the stirring body of centrifugal force；The support plate 34A of circular cone shape, it has slotting in lower end Enter the axle portion 34B in suction inlet 10a and the lower end with vane plate 40A, 40B is integrally formed；And it is ring-type Outer wall 34PW, it is integrally formed with one end of support plate 34A and vane plate 40A, 40B, and surrounds leaf Sheet 40A, 40B.

Support plate 34A has, in lower end, the axle portion 34B inserted in above-mentioned suction inlet 10a.Axle portion 34B has There is criss-cross projection 34b extended along central axis.

It is configured with the output shaft 15S with driving motor 15 at the through hole 34a of the central part of support plate 34A The sleeve member 44 connected.Sleeve member 44 is on the central axis common with the central axis of axle portion 34B It is integrally formed, and prominent in the way of through above-mentioned through hole 14a.That is, sleeve member 44 is formed as phase Bearing-surface for support plate 34A is substantially vertical.Sleeve member 44 by connecting piece 34R1,34R2, 34R3,34R4 link with the edge of through hole 34a.Connecting piece 34R1～34R4 are respectively along its circumferencial direction At uniform intervals in branch everywhere, and it is integrally formed with the end of axle portion 34B.Four vane plate 40A, Four vane plate 40B are radially configured at the edge of through hole 34a.Vane plate 40A along support plate The length of the radial direction of 34A is set as that the length than corresponding vane plate 40B is long.

As shown in Figure 6 C, pump rotor 36 is such as integrally formed by resin material, and it has in common that tool Just like the ring-type outer wall of pump rotor 12, its difference is not such as multiple series connection projection tab of pump rotor 12 20ai (i=1～52) and 20bi (i=1～20).Pump rotor 36 includes: multiple vane plate 50A, 50B, It constitutes convection cell and applies the stirring body of centrifugal force；The support plate 36A of circular cone shape, it has slotting in lower end Enter the axle portion 36B in suction inlet 10a and the lower end with vane plate 50A, 50B is integrally formed；And it is ring-type Outer wall 36PW, it is integrally formed with one end of support plate 36A and vane plate 50A, 50B, and surrounds leaf Sheet 50A, 50B.

Support plate 36A has, in lower end, the axle portion 36B inserted in above-mentioned suction inlet 10a.Axle portion 36B has There is criss-cross projection 36b extended along central axis.

It is configured with the output shaft 15S with driving motor 15 at the through hole 36a of the central part of support plate 36A The sleeve member 46 connected.Sleeve member 46 is on the central axis common with the central axis of axle portion 36B It is integrally formed, and prominent in the way of through above-mentioned through hole 14a.That is, sleeve member 46 is formed as phase Bearing-surface for support plate 36A is substantially vertical.Sleeve member 46 is configured at through hole 36a, and passes through Vane plate 50A is linked to the inner peripheral portion of outer wall 36PW.Four vane plate 50A are respectively in sleeve member 46 And it is formed at everywhere along its circumferencial direction with uniform intervals between outer wall 36PW.Four vane plate 50B exist The adjacent vane plate 50A predetermined space that is spaced from each other radially is configured at the edge of through hole 36a. The length along the radial direction of support plate 36A of vane plate 50A is set as than corresponding vane plate 50B's Length is long.It addition, between vane plate 50A and vane plate 50B, adjacent with the inner peripheral portion of outer wall 36PW Connect and be formed with projection tab 50C.

The longitudinal axis is set to sound pressure level (logarithm noise figure) (dB) by Fig. 8, and transverse axis is set to lift (mm), Illustrate that the sound pressure level of the draining pump A corresponding with lift change curve L0, L1, L2, L3 with And L4.Wherein, 0 (dB) is set to the maximum of the sound pressure level of existing product.

Curve L0 represents the pump rotor 12 used in an example of the draining pump being arranged on the present invention In the case of the change of sound pressure level, bent L4, L2, L3 represent comparative example 1, comparative example 2, ratio respectively The relatively change of the sound pressure level of example 3.Though additionally, eliminate diagram, by with above-mentioned pump rotor In the case of 32 only difference is that being not provided with the pump rotor of intercommunicating pore 32C is installed on draining pump A, it is special Property line is curve L1.

In fig. 8, it has been confirmed that such as according to curve L0, be 150mm's～450mm at lift In in the range of, i.e. in low lift, sound pressure level than be equal to the comparative example 1 of existing product, comparative example 2, The sound pressure level of comparative example 3 is low.Therefore, it can confirm, compared with existing pump rotor, by pump rotor In the case of 12 are installed on draining pump A, low lift reduces sound pressure level further.

Therefore, in an example of the draining pump of the present invention, pump rotor 12 applies by having convection cell Multiple series connection projection tab 20ai of centrifugal force and the surrounding of multiple projection tab 20ai are neighbouring and carry out surrounding Ring-type outer wall 12PW and projection tab 20bi integral part of with outer wall 12PW, improve draining pump In the case of drainability, even if when low lift, it is also possible to reduce by the sound of striking caused by pump rotor Sound pressure level.

Claims (2)

1. a draining pump, it is characterised in that including:

Pump case, it has suction inlet and outlet；And

Pump rotor, it can be configured at rotatably in the rotor receiving room of said pump housing, and have: open Mouthful, its fluid imported for use by above-mentioned suction inlet passes through；Support plate, it is formed multiple at a predetermined interval Projection tab, above-mentioned multiple projection tab are when support plate is rotated by rotary drive mechanism, to by above-mentioned opening And the fluid that imports applies centrifugal force；And ring-type outer wall, it is supported in above-mentioned support plate, and surrounds The outermost arrangement of the radial direction along above-mentioned support plate in above-mentioned multiple projection tab.

Draining pump the most according to claim 1, it is characterised in that

The fluid imported by above-mentioned opening, after mutual by above-mentioned multiple projection tab, is crossed above-mentioned Outer wall and flow out to above-mentioned outlet.