CN110939610B

CN110939610B - Mute pump

Info

Publication number: CN110939610B
Application number: CN201911304029.8A
Authority: CN
Inventors: 李建尧; 史为民
Original assignee: Shaoxing Xuehua Electrical & Mechanical Co ltd
Current assignee: Shaoxing Xuehua Electrical & Mechanical Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-11-13
Anticipated expiration: 2039-12-17
Also published as: CN110939610A

Abstract

The invention discloses a silent pump, which comprises a pump body provided with a water inlet and a water outlet, wherein one end of the pump body, which is far away from the water inlet, is connected with a compensation pressure barrel, the compensation pressure barrel comprises a barrel body and a steam pocket arranged in the barrel body, the steam pocket divides a cavity in the barrel body into a filling cavity and a compensation cavity, and the barrel body is provided with a water inlet which communicates the interior of the pump body with the interior of the filling cavity; the barrel body is provided with a steam filling opening communicated with the compensation cavity, and the steam filling opening is provided with a steam valve core. Install the pressure tank on the water pump to ensure the water inlet intercommunication of the inside and staving of water pump, so, the water pump is in the course of the work, when the unstable phenomenon of internal pressure appears, can be used in and drive the steam pocket and take place the activity on the steam pocket, thereby change the size of filling chamber and compensation chamber, be used for compensating water pressure's among the water pump change, ensure that water pump water pressure keeps at comparatively stable state in transportation process.

Description

Mute pump

Technical Field

The invention relates to the technical field of water pumps, in particular to a silent pump.

Background

The water pump is a machine for conveying liquid or pressurizing liquid, and it can transfer the mechanical energy of prime mover or other external energy to the liquid to increase the energy of liquid, and is mainly used for conveying liquid including water, oil, acid-base liquid, emulsion, suspoemulsion and liquid metal, etc.

For example, chinese patent No. CN101655095B discloses an electric water pump, which includes a housing, a sleeve, a water guiding cover, and a water drawing mechanism. The shell comprises a communicating pipe body which is arranged on the peripheral surface of the shell body in a protruding way in a front-back extending way and is penetrated with a communicating flow passage, and the shell body is provided with a through hole communicated with the back end of the communicating flow passage. The sleeve is provided with a communication hole for communicating the interior of the sleeve with the through hole. The water guide cover is fixedly arranged at the front ends of the machine shell and the sleeve and is provided with a drainage hole communicated between the water inlet of the water guide cover and the communication flow channel.

The existing electric water pump drives the water drawing mechanism to rotate through a motor, then the water guide cover is matched with the water inlet to suck water, and the water is discharged through the water outlet, but in the using process of the electric water pump, the phenomenon that the water flow bursts and the water supply pressure is insufficient can be found out discontinuously, the reason is that the water pump is in the operation process, because of the existence of bubbles in water, the stability of water pressure in the water pump can not be ensured constantly, certain fluctuation can exist, when the transient change fluctuation of the water pressure is large, large noise can be generated, and the mute effect of the mute pump is effectively reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a silent pump which has the function of balancing the air pressure in a water pump, so that the pressure of the water pump can be more stable in the operation process, and the silent pump has a better silent effect.

The technical purpose of the invention is realized by the following technical scheme:

a silent pump comprises a pump body provided with a water inlet and a water outlet, wherein one end of the pump body, which is far away from the water inlet, is connected with a compensation pressure barrel, the compensation pressure barrel comprises a barrel body and a steam pocket arranged in the barrel body, the steam pocket divides a cavity in the barrel body into a filling cavity and a compensation cavity, and the barrel body is provided with a water inlet for communicating the interior of the pump body with the interior of the filling cavity; the barrel body is provided with a steam filling opening communicated with the compensation cavity, and the steam filling opening is provided with a steam valve core.

The pressure barrel is arranged on the water pump, and the inside of the water pump is communicated with the water inlet of the barrel body, so that when the internal pressure of the water pump is unstable in the working process, the water pump can act on the steam pocket to drive the steam pocket to move, the sizes of the filling cavity and the compensation cavity are changed, the water pressure change in the water pump is compensated, and the water pressure of the water pump is kept in a stable state in the conveying process; and the setting of filling the vapour mouth can fill the gas in supplementing the chamber in advance to make the vapour pocket can have an initial pressure, thereby better compensate water pressure, and because the pump is in negative pressure state in work process water inlet department, consequently with the setting of compensation pressure bucket in the one end of keeping away from the water inlet, can reduce the interference, make the vapour pocket better to the accuracy of hydraulic change.

More preferably: the barrel body comprises a pressure barrel shell in a cover-shaped structure and a pressure barrel seat hermetically arranged at the opening end of the pressure barrel shell, the water inlet is arranged on the pressure barrel seat, and the steam charging port is arranged on the pressure barrel shell; the opening end of the pressure barrel shell is turned over to form an annular clamping groove with an inward opening, and the edge of the pressure barrel seat and the edge of the steam pocket are clamped and fixed in the annular clamping groove.

So set up, the structure setting of adoption components of a whole that can function independently makes during the gasbag can be relatively easy installs the staving, and simple structure, does not have too much connection structure, and is comparatively convenient in processing, and simultaneously, three's assembly only need can realize bending the pressure vessel shell, and is very simple and convenient.

More preferably: a folding edge is arranged between the steam pocket and the sealing ring, annular grooves are formed in the inner wall and the outer wall of the junction of the folding edge and the steam pocket, and annular variable grooves are formed in the inner wall and the outer wall of the steam pocket.

So set up, set up through the annular groove, the mounting structure of cooperation steam pocket makes its natural formation hem structure, and the setting of the easy groove that becomes of cooperation annular in addition for the steam pocket has bigger range of variation, and the sensitivity is higher, changes along with water pressure change in the water pump more easily, thereby has compensation effect better.

More preferably: the pump body is installed on a driving motor's shell, driving motor's pivot stretches into the pump body and forms the pump shaft, fixedly connected with stator on the pump shaft, pump body one end is the opening setting and the opening part is connected with the pump cover, compensation pressure bucket threaded connection is on the pump cover, be provided with one on the pump body with the coaxial holding ring of pump shaft, the edge of stator is provided with one and supplies the holding ring to insert the annular constant head tank of establishing.

So set up, the inboard of stator is fixed on the pump shaft, and the outside is then spacing through constant head tank and holding ring cooperation to make the stator inside and outside all realize the location, thereby can effectual guarantee stator stability, make it difficult the appearance after long-term the use rock the phenomenon.

More preferably: a convex ring with the thickness smaller than that of the guide vane is arranged at the edge of the guide vane, a plurality of limiting blocks are uniformly distributed at the outer edge of the convex ring around the axial line, and the annular positioning groove is formed among the convex ring, the outer wall of the guide vane and the limiting blocks; the clearance between the guide vane outer wall and the positioning ring is larger than the clearance between the limiting block and the positioning ring.

So set up, the setting that adopts the stopper can reduce and the position ring contact area within a definite time when guaranteeing to carry on spacingly to the stator outer fringe to reduce the resistance of stator between rotation in-process and position ring.

More preferably: the minimum distance between the connecting part of the pump cover and the pump cover axis line connected with the pump body is smaller than the maximum distance between the limiting block and the guide vane axis, and the limiting block is axially limited between the pump cover and the positioning ring along the guide vane axis line direction.

So set up, the setting that adopts the stopper can be when guaranteeing to carry on spacingly to the stator outer fringe, reduce and the position ring within a definite time area of contact, in addition, because the contact surface is far greater than the contact surface between stopper and position ring between stator outer wall and position ring, above-mentioned setting can reduce the resistance and the wearing and tearing of stator in the rotation process, improves life, makes its long-term use back silence effect can not appear big weakening.

More preferably: the utility model discloses a guide vane pump, including the stator, the stator is provided with inlet impeller and outlet impeller respectively, inlet impeller and outlet impeller all fix on the pump shaft, the stator includes front shroud and back shroud, the front shroud is fixed on the pump shaft, be provided with the water conservancy diversion import on the front shroud, be provided with the water conservancy diversion export on the back shroud, be provided with on the outlet impeller and insert and locate the intraoral water butt joint cover that goes out of water conservancy diversion, it switches on with outlet impeller is inside to go out water butt joint cover.

So set up for the stator back shroud cover is established and is sheathe in the play water butt of going out water impeller, and location stator that can be further makes it more difficult emergence rock.

More preferably: the water inlet impeller is provided with a water inlet butt joint sleeve communicated with the inside of the water inlet impeller, the water inlet butt joint sleeve is sleeved with a water deflector box, the pump body is integrally provided with a butt joint ring, the water deflector box is abutted to the butt joint ring, and the positioning ring is integrally arranged on the water deflector box.

So set up, the water deflector box plays isolated pump body import and the impeller outward flange gap of intaking at first to guide rivers to advance into the impeller of intaking from the butt cover of intaking. In addition, because the water deflector box is movable in the circumferential direction, the positioning ring can also move in the rotating process of the guide vane, so that the rotating resistance and abrasion of the guide vane can be further reduced, and the service life of the guide vane is prolonged.

More preferably: be provided with a plurality of arc guide plates between front shroud and the back shroud, the arc guide plate is in stator outer wall internal extension, evenly set up around the stator axle center between the arc guide plate, the water conservancy diversion import is located on the outward flange of front shroud terminal surface, just the runner intercommunication between water conservancy diversion import and two adjacent arc guide plates.

So set up, to flow back the import and set up at the stator outer fringe, make the passageway that forms between water inlet impeller, stator and the water outlet impeller three can play a better negative pressure drainage effect.

More preferably: be provided with the same arc deflector of quantity and arc guide plate between front shroud and the back shroud, arc deflector one end and arc guide plate end connection, the other end are connected with the arc guide plate, just the radian of arc deflector is greater than the radian of arc guide plate, the runner that forms between arc guide plate and the adjacent arc guide plate is to outside-in and is gradually big setting.

So set up, the runner becomes gradually big structure along rivers direction in making the stator, the effect of formation negative pressure drainage that can be better, simultaneously, can make the stator have better silence effect at the during operation.

In conclusion, the invention has the following beneficial effects:

1. the function of air pressure in the water pump is balanced, so that the pressure of the water pump can be more stable in the operation process, and the noise generated by the change of the water pressure is reduced;

2. the outer edge of the guide vane is limited, and the guide vane is not easy to shake after being used for a long time due to the movable arrangement of the water deflector box and the positioning ring, so that the service life is effectively prolonged, and the guide vane has a longer silencing effect;

3. the water inlet impeller, the guide vanes and the water outlet impeller which are of specific structures are adopted, so that the water pump has a better silencing effect.

Drawings

FIG. 1 is a schematic view of the construction of a silent pump;

FIG. 2 is a schematic structural view of a water deflector;

FIG. 3 is a front partial cross-sectional view of the pump body;

FIG. 4 is a schematic illustration of an exploded structure of a water deflector;

FIG. 5 is a sectional view A-A of FIG. 4;

FIG. 6 is a front view of a guide vane;

FIG. 7 is a schematic structural view of a pressure barrel;

fig. 8 is a schematic diagram of an exploded structure of the pressure tank.

In the figure, 100, a driving motor; 200. a water deflector; 210. a pump body; 211. a water inlet; 212. a water outlet; 213. a butting ring; 220. a guide vane; 221. a front cover plate; 222. a rear cover plate; 223. a convex ring; 224. a limiting block; 225. an arc-shaped guide plate; 226. an arc-shaped guide plate; 227. a diversion inlet; 228. a diversion outlet; 229. an annular positioning groove; 230. a water inlet impeller; 231. a water inlet connecting sleeve; 240. a water outlet impeller; 250. a pump shaft; 260. a water deflector box; 270. a pump cover; 271. a threaded connector; 300. a pressure-compensated barrel; 310. a barrel body; 311. a pressure barrel housing; 3111. a water inlet; 3113. a step; 312. a pressure barrel seat; 3121. an annular neck; 3122. a steam charging port; 320. a bladder; 321. an annular groove; 322. an annular variable groove; 323. folding edges; 324. a butting block; 330. filling the cavity; 340. a compensation chamber; 350. a valve core; 360. a valve core cover.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A silent pump, as shown in fig. 1, comprises a driving motor 100, a water deflector 200 and a compensation pressure barrel 300, wherein the water deflector 200 is mounted on the driving motor 100, a rotating shaft of the driving motor 100 extends into the water deflector 200, and the compensation pressure barrel 300 is screwed on the other end of the water deflector 200 and is arranged opposite to the driving motor 100.

Referring to fig. 2, the water deflector 200 includes a pump body 210, a guide vane 220, a water inlet impeller 230, a water outlet impeller 240, a water deflector box 260, and a pump cover 270, wherein one end of the pump body 210 is fixedly mounted on the housing of the driving motor 100, the other end is open, and the pump cover 270 is connected to the open end of the pump body 210.

The rotating shaft of the driving motor 100 extends into the pump body 210 to form a pump shaft 250, the guide vanes 220, the water inlet impeller 230 and the water outlet impeller 240 are all fixedly mounted on the pump shaft 250, the water inlet impeller 230 and the water outlet impeller 240 are respectively located on two sides of the guide vanes 220, and the water outlet impeller 240, the guide vanes 220 and the water inlet impeller 230 are sequentially arranged along the direction away from the opening of the pump body 210.

Referring to fig. 3, a water inlet 211 and a water outlet 212 are provided in the pump body 210, and a water inlet passage communicating with the water inlet 211 communicates with the axial center of the end surface of the pump body 210 connected to the driving motor 100.

Referring to fig. 3 and 4, an abutting ring 213 is integrally provided on the pump body 210, and the abutting ring 213 is located on the inner wall of the end surface of the pump body 210 connected to the driving circuit.

Referring to fig. 2 and 4, a water inlet connection sleeve 231 is disposed on the water inlet impeller 230, the water inlet connection sleeve 231 is communicated with the interior of the water inlet impeller 230, and the water deflector box 260 is annular and is sleeved on the water inlet connection sleeve 231. The outer edge end face of the water deflector box 260 abuts against the abutting ring 213, the gap between the inlet of the pump body 210 and the outer edge of the water inlet impeller 230 is isolated by the water deflector box 260, that is, the water inlet 211 is isolated from the cavity of the inner wall of the pump body 210, so that the water inlet 211 is communicated with the inner wall of the water inlet impeller 230 through the water inlet connecting sleeve 231 to realize water inlet, an arc-shaped partition plate is arranged between the front wall and the rear wall of the water inlet impeller 230, and the outlet is arranged at the.

A positioning ring is integrally provided on the edge of the end surface of the water deflector box 260 facing the opening of the pump body 210, and the positioning ring and the water deflector box 260 are coaxially provided. Referring to fig. 5 and 6, a convex ring 223 with a thickness smaller than that of the guide vane 220 is arranged on the edge side wall of the guide vane 220, six limit blocks 224 are uniformly distributed on the outer edge of the convex ring 223 around the axial line, an annular positioning groove 229 is formed among the convex ring 223, the outer wall of the guide vane 220 and the plurality of limit blocks 224, referring to fig. 2, when the guide vane 220 is installed on the pump shaft 250, the positioning ring is inserted into the annular positioning groove 229 to be matched with the annular positioning groove, wherein the gap between the outer wall of the guide vane 220 and the positioning ring is larger than the gap between the limit blocks 224 and the positioning.

The minimum distance between the connecting part of the pump cover 270 connected with the pump body 210 and the axis of the pump cover 270 is smaller than the maximum distance between the limiting block 224 and the axis of the guide vane 220, so that when the pump cover 270 is mounted on the pump body 210, the pump cover 270 is abutted against the limiting block 224, and the limiting block 224 is axially limited between the pump cover 270 and the positioning ring along the axis of the guide vane 220.

Referring to fig. 4, the guide vane 220 includes a front cover plate 221 and a rear cover plate 222, and the front cover plate 221 is fixed to a pump shaft 250.

Referring to fig. 5 and 6, 8 arc-shaped baffles 225 are arranged between the front cover plate 221 and the rear cover plate 222, the 8 arc-shaped baffles 225 are distributed around the axial lead of the guide vane 220 at equal intervals, one end of each arc-shaped baffle 225 is connected to the outer wall of the guide vane 220, the other end of each arc-shaped baffle 225 extends in an inward bending manner on the outer wall of the guide vane 220, and the arc-shaped baffles 225 are obliquely arranged on the rear cover plate 222 towards the front cover plate 221.

Arc guide plates 226 the same as the arc guide plates 225 in number are arranged between the front cover plate 221 and the rear cover plate 222, one end of each arc guide plate 226 is connected with the end of the arc guide plate 225, the other end of each arc guide plate 226 is connected with the arc guide plate 225, the radian of each arc guide plate 226 is larger than that of each arc guide plate 225, and a flow channel formed between each arc guide plate 225 and the adjacent arc guide plates 226 is gradually enlarged from outside to inside.

The outer edge of the end face of the front cover plate 221 is provided with 8 flow guide inlets 227, and the flow guide inlets 227 are communicated with the flow channels between two adjacent arc-shaped flow guide plates 225. A flow guide outlet 228 is provided in the rear cover plate 222. Referring to fig. 4, the outlet impeller 240 is provided with an outlet abutting sleeve inserted into the diversion outlet 228, and the outlet abutting sleeve is communicated with the inside of the outlet impeller 240.

As shown in fig. 7 and 8, the compensating pressure barrel 300 includes a barrel body 310 and an air bladder 320, the barrel body 310 includes a pressure barrel casing 311 and a pressure barrel seat 312, and the pressure barrel casing 311 is in a cover-shaped structure and is integrally formed by using an austenitic stainless steel material. The opening end of the pressure barrel shell 311 is turned over to form an annular clamping groove 3121 with an inward opening, the diameter of the annular clamping groove 3121 is larger than the maximum diameter of the pressure barrel shell 311, and the edge of the pressure barrel seat 312 is clamped and fixed in the annular clamping groove 3121.

The steam pocket 320 is in a cover-shaped structure, a sealing ring is integrally arranged at the edge of the opening end of the steam pocket 320, the thickness of the sealing ring is larger than that of the steam pocket 320, a step 3113 matched with the sealing ring is arranged at the edge of the pressure barrel seat 312, and the sealing ring is clamped in the annular clamping groove 3121, so that the steam pocket 320 is fixed, and meanwhile, the sealing between the pressure barrel shell 311 and the pressure barrel seat 312 is realized.

After the pressure barrel shell 311 and the pressure barrel seat 312 are connected, a cavity is formed in the barrel body 310, and the air bladder 320 is located in the cavity and divides the cavity into a filling cavity 330 and a compensation cavity 340. The pressure barrel seat 312 is provided with a water inlet 3111 and a screw connector coaxially disposed with the water inlet 3111. Referring to fig. 1 and 2, the pump cover 270 is provided with a screw connection port 271, and the screw connection head is screwed to the screw connection port 271, thereby connecting the offset pressure tank 300 and the pump cover 270, and communicating the interior of the pump body 210 with the filling chamber 330 through the water inlet 3111.

Referring to fig. 7 and 8, the pressure barrel housing 311 is provided with a steam filling port 3122 communicated with the compensation chamber 340, the steam filling port 3122 is provided with a steam core 350, the steam filling port 3122 is provided with a steam core cover 360, and the compensation chamber 340 is filled with nitrogen through the steam filling port 3122, wherein the specific filling amount of the nitrogen is determined according to the size of the silent pump and the working pressure. An abutting block 324 is disposed on the outer sidewall of the air bladder 320 at a position corresponding to the door core 350 for protecting the air bladder 320.

A folding edge 323 is arranged between the steam pocket 320 and the sealing ring, annular grooves 321 are arranged on the inner wall and the outer wall of the junction of the folding edge 323 and the steam pocket 320, and the folding edge 323 is automatically formed after the steam pocket 320 is arranged on the barrel body 310 through the annular grooves 321. The inner wall and the outer wall of the air bag 320 are also provided with an annular easy-changing groove 322, the two annular easy-changing grooves 322 are oppositely arranged, the annular easy-changing groove 322 is positioned at the top end position close to the cover-shaped structure of the air bag 320, and the cover-shaped bent side wall of the air bag 320 is positioned between the annular groove 321 and the annular easy-changing groove 322.

The working principle is as follows:

the driving motor 100 is started, the pump shaft 250 drives the water inlet impeller 230, the guide vane 220 and the water outlet impeller 240 to rotate to generate negative pressure, so that water is sucked in from the water inlet 211 of the pump body 210, then enters the water inlet impeller 230 from the water inlet connecting sleeve 231 of the water inlet impeller 230 under the blocking and guiding of the water deflector box 260, is sent out from the side edge of the water inlet impeller 230, enters the guide vane 220 from the flow guide inlet 227 of the guide vane 220, enters the water outlet impeller 240 from the water outlet connecting sleeve at the inner side of the flow guide outlet 228, is sent out from the side edge of the water outlet impeller 240, and finally is sent out from the water outlet 212 of the pump body 210. In the process, water enters the filling cavity 330 of the compensating pressure barrel 300 from the water inlet 3111 through the pump body 210, and when the water pressure in the pump body 210 changes, the left and right movements of the air bladder 320 occur, so that the water pressure change is supplemented.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A silent pump comprises a pump body (210) provided with a water inlet (211) and a water outlet (212), and is characterized in that: one end, far away from the water inlet (211), of the pump body (210) is connected with a compensation pressure barrel (300), the compensation pressure barrel (300) comprises a barrel body (310) and an air sac (320) arranged in the barrel body (310), the air sac (320) divides a cavity inside the barrel body (310) into a filling cavity (330) and a compensation cavity (340) in the barrel body (310), and a water inlet (3111) communicating the inside of the pump body (210) with the inside of the filling cavity (330) is formed in the barrel body (310); the barrel body (310) is provided with a steam charging port (3122) communicated with the compensation cavity (340), and the steam charging port (3122) is provided with a steam valve core (350);

the pump body (210) is mounted on a shell of a driving motor (100), a rotating shaft of the driving motor (100) extends into the pump body (210) to form a pump shaft (250), a guide vane (220) is fixedly connected to the pump shaft (250), one end of the pump body (210) is provided with an opening, the opening is connected with a pump cover (270), the compensating pressure barrel (300) is in threaded connection with the pump cover (270), the pump body (210) is provided with a positioning ring which is coaxial with the pump shaft (250), and the edge of the guide vane (220) is provided with an annular positioning groove (229) for the positioning ring to be inserted;

a convex ring (223) with the thickness smaller than that of the guide vane (220) is arranged at the edge of the guide vane (220), a plurality of limiting blocks (224) are uniformly distributed at the outer edge of the convex ring (223) around the axial line, and the annular positioning groove (229) is formed among the convex ring (223), the outer wall of the guide vane (220) and the plurality of limiting blocks (224); the clearance between the outer wall of the guide vane (220) and the positioning ring is larger than the clearance between the limiting block (224) and the positioning ring.

2. The silent pump as claimed in claim 1, wherein: the barrel body (310) comprises a pressure barrel casing (311) in a cover-shaped structure and a pressure barrel seat (312) hermetically installed at the opening end of the pressure barrel casing (311), the water inlet (3111) is arranged on the pressure barrel seat (312), and the steam charging port (3122) is arranged on the pressure barrel casing (311); the opening end of the pressure barrel shell (311) is turned over to form an annular clamping groove (3121) with an inward opening, and the edge of the pressure barrel seat (312) and the edge of the steam bag (320) are clamped and fixed in the annular clamping groove (3121).

3. The silent pump according to claim 2, wherein: a folding edge (323) is arranged between the air bag (320) and the sealing ring, annular grooves (321) are formed in the inner wall and the outer wall of the junction of the folding edge (323) and the air bag (320), and annular easy-to-change grooves (322) are formed in the inner wall and the outer wall of the air bag (320).

4. The silent pump as claimed in claim 1, wherein: the minimum distance between the connecting portion that pump cover (270) are connected with pump body (210) and pump cover (270) axle center line is less than the maximum distance between stopper (224) and stator (220) axle center, just stopper (224) are spacing between pump cover (270) and holding ring along stator (220) axial lead direction axial.

5. A silent pump as claimed in claim 1 or 4, wherein: the both sides of stator (220) are provided with impeller (230) and play water impeller (240) respectively, impeller (230) and play water impeller (240) of intaking are all fixed on pump shaft (250), stator (220) include front shroud (221) and back shroud (222), front shroud (221) are fixed on pump shaft (250), be provided with water conservancy diversion import (227) on front shroud (221), be provided with water conservancy diversion export (228) on back shroud (222), it inserts the play water butt joint cover of locating in water conservancy diversion export (228) to be provided with on play water impeller (240), it communicates with play water impeller (240) inside to go out water butt joint cover.

6. The silent pump according to claim 5, wherein: be provided with the butt cover of intaking that switches on with intake impeller (230) inside on intake impeller (230), the butt cover of intaking is equipped with a water deflector box (260), an organic whole is provided with a butt ring (213) on the pump body (210), water deflector box (260) are to establishing on butt ring (213), the holding ring an organic whole sets up on water deflector box (260).

7. The silent pump according to claim 5, wherein: be provided with a plurality of arc guide plates (225) between front shroud (221) and back shroud (222), arc guide plate (225) are in stator (220) outer wall internal extension, evenly set up around stator (220) axle center between arc guide plate (225), water conservancy diversion import (227) are located on the outward flange of front shroud (221) terminal surface, just runner intercommunication between water conservancy diversion import (227) and two adjacent arc guide plates (225).

8. The silent pump as claimed in claim 7, wherein: be provided with between front shroud (221) and back shroud (222) the same arc deflector (226) of quantity and arc deflector (225), arc deflector (226) one end and arc deflector (225) end connection, the other end are connected with arc deflector (225), just the radian of arc deflector (226) is greater than the radian of arc deflector (225), the runner that forms between arc deflector (225) and adjacent arc deflector (226) is outwards inwards to be and gradually enlarges the setting.