CN113586466A

CN113586466A - Amphibious water pump

Info

Publication number: CN113586466A
Application number: CN202110994187.1A
Authority: CN
Inventors: 李宗顺; 张军; 王欣
Original assignee: Fujian Haiqishi Pump Industry Co ltd
Current assignee: Fujian Haiqishi Pump Industry Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2021-11-02
Anticipated expiration: 2041-08-27
Also published as: CN113586466B

Abstract

The invention discloses an amphibious water pump, which belongs to the field of water pumps and comprises a volute, a pump shell and a driving motor, wherein the driving motor is fixed in the pump shell, and the outer wall of the driving motor is attached to the inner wall of the pump shell; the outer shell is wrapped outside the pump shell, a water storage cavity is formed between the outer shell and the pump shell and is wrapped outside the pump shell, and a driving impeller is arranged on an output shaft of the driving motor; one end of the volute is fixedly connected with the pump shell, an impeller cavity is formed in the end of the volute, the driving impeller is located in the impeller cavity, the impeller cavity is communicated with the water storage cavity, a water inlet port is formed in the other end of the volute, a water outlet port is formed in the side wall of the volute in the tangential direction and located outside the impeller cavity, and the water inlet direction of the water inlet port is the same as the length direction of the driving motor. After being sucked into the impeller cavity, water is pumped out from the water outlet port by driving the impeller, and meanwhile, part of water in the impeller cavity overflows into the water storage cavity, so that the driving motor can be cooled.

Description

Amphibious water pump

Technical Field

The invention relates to the field of water pumps, in particular to an amphibious water pump.

Background

The existing pumps are classified according to whether the motor can be immersed in water, and can be divided into a submersible pump and a pump generally installed above the liquid level. The submersible pump is an important device for pumping water from a deep well, extracts underground water to the ground surface, and is an essential pumping device for domestic water, mine emergency, industrial cooling, farmland irrigation, seawater lifting, ship load regulation and the like. Pumps typically mounted above the liquid level, such as: the centrifugal pump can vaporize water and the pump can not suck water when the atmospheric pressure and the water pressure are reduced to a certain value, and the water suction lift of the common centrifugal pump can not exceed nine meters. At the same time, the pump unit cannot be submerged under water. In the work of disaster relief and emergency rescue, the pump may need to be arranged in water to take water, and may also be flexibly installed and applied in some places inconvenient to install in water, and need to be arranged on land to take water, in addition, in order to guarantee the efficiency of emergency rescue, sometimes need to be applied to a water pipe pipeline system of remote transmission as the water pump, and in the activity of emergency rescue, uncertain factor is too many, the site environment is complicated, so the water pump carried is preferably amphibious, thus not only can save cost, but also can improve the efficiency of emergency rescue.

Chinese patent publication No. CN111946634A discloses a water-land dual-purpose supercharged water intake pump and a supercharged pump vehicle, the water-land dual-purpose supercharged water intake pump includes a controller, a pump body and a driving motor, a water outlet of the pump body is provided with a one-way valve and a liquid level sensor, the driving motor is provided with a current sensor for detecting the current value of the driving motor, the pump body is provided with a vacuum pump, the vacuum pump is used for pumping air in the pump body to form negative pressure in the pump body and pumping liquid to realize cooling of the driving motor, the vacuum pump is connected with an inlet pipe and an outlet pipe, the inlet pipe is communicated with the pump body, the outlet pipe is wound on the shell of the driving motor as a cooling pipe, the liquid level sensor and the current sensor, the selector switch and the driving motor are in signal connection with the controller, and the controller is used for receiving detection signals of the liquid level sensor and the liquid level sensor, then performing comparison calculation, and controlling the driving motor and the selector switch to perform corresponding actions according to comparison calculation results.

The motor cooling generally need be considered to current dual-purpose water pump, can set up the water course and flow through the motor outside usually for the temperature can not be too high under the protection of water all the time to the motor, but current these water courses set up and can lead to rivers pumping efficiency to reduce.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an amphibious water pump which guarantees efficient water pumping while guaranteeing that a motor cannot be burnt out.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an amphibious water pump which comprises a volute, a pump shell and a driving motor, wherein the driving motor is fixed in the pump shell, and the outer wall of the driving motor is attached to the inner wall of the pump shell; an outer shell is wrapped outside the pump shell, a water storage cavity is formed between the outer shell and the pump shell and is wrapped outside the pump shell, and a driving impeller is arranged on an output shaft of the driving motor; one end of the volute is fixedly connected with the pump shell, an impeller cavity is formed in the end of the volute, the driving impeller is located in the impeller cavity, the impeller cavity is communicated with the water storage cavity, a water inlet port is formed in the other end of the volute, a water outlet port is formed in the side wall of the volute in the tangential direction and located outside the impeller cavity, and the water inlet direction of the water inlet port is the same as the length direction of the driving motor.

The invention has the preferable technical scheme that one end of the water inlet port, which is connected with a water pipe, is provided with a connecting hole, one end of the water inlet port, which is close to the impeller cavity, is provided with a water inlet, and the diameter of the connecting hole is larger than that of the water inlet; the projection circle of the water inlet hole on the section of the connecting hole is internally tangent to the end of the projection dome of the connecting hole, a transition inclined plane is arranged on the inner wall between the connecting hole and the water inlet hole, and the transition inclined plane continuously shrinks from the connecting hole and extends to the water inlet hole; the bottom end of the outside of the water inlet port, which is far away from the water inlet hole, is provided with a supporting leg for installation and placement.

The invention has the preferable technical scheme that a guide fin is arranged at the center of the lower end of the transition inclined plane, a guide arc surface is arranged on one side of the guide fin close to the connecting hole, and the tail end of the guide fin is positioned at the center of the water inlet hole.

The invention has the preferable technical proposal that the water outlet port comprises a volute runner pipe arranged outside the impeller cavity; along the water outlet direction, the diameter of the volute runner pipe is gradually increased; the middle part of the volute runner pipe is provided with a separation rib plate so that the water outlet ends of the impeller cavities are symmetrically distributed on two sides of the runner in the volute runner pipe.

The invention has the preferable technical scheme that the pump shell is cast in an integrated manner, one end of the pump shell, which is connected with the volute, is provided with a connecting disc, a plurality of water passing through holes are arranged on the connecting disc, the outer shell is fixed at one end of the connecting disc, which is far away from the volute, one end of each water passing through hole is communicated with the impeller cavity, and the other end of each water passing through hole is communicated with the water storage cavity between the outer shell and the pump shell; the water passing through hole is positioned on one side of the impeller cavity, and the length direction of the water passing through hole is vertical to the end face of the driving impeller.

The invention has the preferable technical scheme that one end of the volute connected with the pump shell is provided with a transition water cavity, the transition water cavity is positioned at one side of the driving impeller close to the pump shell, and the side of the driving impeller is provided with a driving rib; the transition water cavity is communicated with the impeller cavity, and the water inlet end of the water passing through hole is positioned in the transition water cavity.

The invention has the preferable technical scheme that a water suction cavity is arranged in the middle of the driving impeller close to the water inlet port, a plurality of driving blades are arranged in the water suction cavity, a water drainage cavity is radially arranged on the outer side of the driving impeller, the water drainage cavity is communicated with the water suction cavity, and the driving blades extend into the water drainage cavity.

The invention has the preferable technical scheme that an oil chamber is arranged on the inner side of the connecting disc of the pump shell, the water passing through hole is arranged outside the oil chamber, an oil sealing cover is arranged at the end part of the oil chamber, and the driving motor penetrates through the oil chamber and is fixedly connected with the driving impeller.

The invention has the preferable technical scheme that the outer shell is a cylinder with an opening at one end, the end of the outer shell is fixedly connected with the pump shell so as to seal the water storage cavity, the outer side wall of the pump shell is provided with a plurality of reinforcing ribs, and a gap is reserved between each reinforcing rib and the inner side wall of the outer shell.

The invention has the preferable technical scheme that the water inlet hole and the driving impeller are coaxially arranged, and the inner diameter of the water suction cavity is the same as the diameter of the water inlet hole.

The invention has the beneficial effects that:

the invention provides an amphibious water pump which comprises a volute, a pump shell and a driving motor, wherein the driving motor is fixed in the pump shell, and the outer wall of the driving motor is attached to the inner wall of the pump shell; an outer shell is wrapped outside the pump shell, a water storage cavity is formed between the outer shell and the pump shell and is wrapped outside the pump shell, and a driving impeller is arranged on an output shaft of the driving motor; one end of the volute is fixedly connected with the pump shell, an impeller cavity is formed in the end of the volute, the driving impeller is located in the impeller cavity, the impeller cavity is communicated with the water storage cavity, a water inlet port is formed in the other end of the volute, a water outlet port is formed in the side wall of the volute in the tangential direction and located outside the impeller cavity, and the water inlet direction of the water inlet port is the same as the length direction of the driving motor. After being sucked into the impeller cavity, water is pumped out from the water outlet port by driving the impeller, and meanwhile, part of water in the impeller cavity overflows into the water storage cavity, so that the driving motor can be cooled.

Drawings

Figure 1 is an exploded overall schematic view of an amphibious water pump as provided in an embodiment of the invention;

FIG. 2 is a schematic front side view of a volute provided in an embodiment of the present invention;

FIG. 3 is a rear side schematic view of a volute provided in an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of portion A of FIG. 1 provided in accordance with an embodiment of the present invention;

figure 5 is a schematic cross-sectional view of an amphibious water pump provided in an embodiment of the invention;

in the figure:

1. an outer housing; 2. a pump housing; 3. an oil seal cover; 4. a volute; 5. driving the impeller; 102. a water storage cavity; 21. a connecting disc; 22. a water passing through hole; 23. reinforcing ribs; 24. an oil chamber; 41. a water inlet port; 42. a water outlet port; 43. supporting legs; 44. an impeller cavity; 45. a transition water cavity; 411. connecting holes; 412. a transition bevel; 413. a water inlet hole; 414. a guide fin; 421. a partition rib plate; 422. a volute runner pipe; 4141. a flow guide arc surface; 51. a water absorbing wall; 52. a drainage cavity; 53. a driving blade; 54. the ribs are driven.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1-5, an amphibious water pump comprises a volute 4, a pump shell 2 and a driving motor, wherein the driving motor is fixed in the pump shell 2, and the outer wall of the driving motor is attached to the inner wall of the pump shell 2; the pump casing 2 is externally wrapped with an outer casing 1, a water storage cavity 102 is formed between the outer casing 1 and the pump casing 2, and the water storage cavity 102 is wrapped outside the pump casing 2. Water wraps around the pump case 2 after entering the water storage cavity 102, so that transition heating of the driving motor can be effectively avoided, the temperature does not exceed the boiling point of water, the motor has no problem, and the water can be effectively protected from being damaged as long as the water wraps around the driving motor. A driving impeller 5 is arranged on an output shaft of the driving motor; the utility model discloses a pump casing, including volute 4, water storage chamber 102, water inlet port 41, drive impeller 5, water outlet port 42, volute 4 one end with pump case 2 fixed connection, this end of volute 4 is provided with impeller cavity 44, drive impeller 5 is located in impeller cavity 44, impeller cavity 44 with water storage chamber 102 is linked together, the other end of volute 4 is provided with water inlet port 41, the lateral wall of volute 4 is provided with water outlet port 42 along the tangential direction, water outlet port 42 is located the outside of impeller cavity 44, water inlet port 41's the direction of intaking with driving motor's length direction is the same. The driving motor drives the driving impeller 5 to rotate, so that water enters from the water inlet port 41 and then is discharged from the water outlet port 42 on the side surface of the volute 4, the whole water flow path does not pass through the water storage cavity 102, and the reduction of water pumping efficiency can be effectively avoided. And the water storage cavity 102 is communicated with the impeller cavity 44, so that water which is not pumped out can enter the water storage cavity 102, the water storage cavity 102 does not circulate, and water can not flow in again as long as the water storage cavity is filled with water, so that the water is pumped out by the driving impeller 5, and the water pumping efficiency is high.

In order to further improve the water pumping efficiency, a connecting hole 411 is arranged at one end of the water inlet port 41 connected with a water pipe, a water inlet hole 413 is arranged at one end of the water inlet port 41 close to the impeller cavity 44, and the diameter of the connecting hole 411 is larger than that of the water inlet hole 413; a projection circle of the water inlet hole 413 on the section of the connecting hole 411 is internally tangent to the end of the projection dome of the connecting hole 411, a transition inclined plane 412 is arranged on the inner wall between the connecting hole 411 and the water inlet hole 413, and the transition inclined plane 412 continuously shrinks from the connecting hole 411 to extend to the water inlet hole 413; the bottom end of the outside of the water inlet port 41, which is far away from the water inlet hole 413, is provided with a supporting leg 43 for installation and placement. When in use, the supporting leg 43 is placed on the ground, so that the water inlet hole 413 is positioned at the top, and water can stably enter under the action of gravity. The existing water inlet port 41 is generally designed to be a bell mouth, water can flow downwards under the action of gravity, and the bell mouth above the water inlet port is gradually reduced, so that a gap can be formed above the water inlet port, and the pumping efficiency can be influenced when water is pumped. The water inlet hole 413 of the invention is designed on the top surface, the upper end of the water inlet port 41 is flat, and the connecting hole 411 moves downwards, so that under the condition of ensuring that the size of the water inlet is not changed, the gap on the top surface is effectively reduced, and the water flow enters the impeller cavity 44 more stably and efficiently.

In order to make the water flow into the impeller cavity 44 more efficiently, a guide fin 414 is arranged at the center of the lower end of the transition inclined surface 412, a guide arc surface 4141 is arranged on one side of the guide fin 414 close to the connecting hole 411, and the end of the guide fin 414 is located at the center of the water inlet 413. The position cambered surface that transition inclined plane 412 is located the below is longer, and the water flow path is longer, and need promote one end distance, and transition inclined plane 412 contracts more near inlet opening 413 position more to water flow speed is accelerated, easily produces the problem such as vortex in inlet opening 413 department and influences water intake efficiency, and the setting of water conservancy diversion fin 414 can play the guide effect, makes during rivers stably get into impeller cavity 44, improves pumping efficiency.

Preferably, the water outlet port 42 includes a volute-type runner pipe 422 disposed outside the impeller cavity 44; along the water outlet direction, the diameter of the volute runner pipe 422 is gradually increased; the middle part of the volute flow passage pipe 422 is provided with a separation rib plate 421, so that the water outlet ends of the impeller cavities 44 are symmetrically distributed at two sides of the flow passage inside the volute flow passage pipe 422. The water flow on one side of the driving impeller 5 close to the volute type runner pipe 422 can be directly pumped out, and the water on the other side needs to change the direction through the other side of the separation rib 421 due to the movement direction idea, so that the water is pumped out, and the water flow pumping efficiency is high.

Preferably, the pump shell 2 is cast in an integrated manner, so that the problem of gap corrosion can be effectively avoided, and the pump shell 2 is not easy to damage even if being soaked in water for a long time. A connecting disc 21 is arranged at one end of the pump shell 2 connected with the volute 4, a plurality of water passing through holes 22 are formed in the connecting disc 21, the outer shell 1 is fixed at one end, away from the volute 4, of the connecting disc 21, one end of each water passing through hole 22 is communicated with the impeller cavity 44, and the other end of each water passing through hole 22 is communicated with the water storage cavity 102 between the outer shell 1 and the pump shell 2; the water passing hole 22 is located at one side of the impeller cavity 44, and the length direction of the water passing hole 22 is perpendicular to the end face of the driving impeller 5. The water through hole is convenient to process, and the heat of the pump shell 2 can be better taken away when water flows through the water through hole 22. The outer shell 1 and the pump shell 2 are connected to form a closed water storage cavity 102, and only the water through hole 22 is reserved to be connected with the impeller cavity 44, so that the water circulation is low, and the pumping efficiency of water in the impeller cavity 44 is not affected. The water in the water storage cavity 102 can effectively protect the driving motor from being damaged.

Further, a transition water cavity 45 is arranged at one end of the volute 4 connected with the pump shell 2, the transition water cavity 45 is positioned at one side of the driving impeller 5 close to the pump shell 2, and a driving rib 54 is arranged at the side of the driving impeller 5; the transition water cavity 45 is communicated with the impeller cavity 44, and the water inlet end of the water through hole 22 is positioned in the transition water cavity 45. Water in the impeller cavity 44 can enter the transition water cavity 45 through a gap between the driving impeller 5 and the inner wall of the volute 4, is preliminarily stored in the transition water cavity 45, is stored in the transition water cavity 45 without influencing the pumping of water in the impeller cavity 44, and meanwhile, the transition water cavity 45 can enable water flow to accurately enter the water passing through holes 22. Without the transitional water cavity 45, it is difficult to ensure that water will accurately enter the water flow bore 22. The driving ribs 54 are provided to stir the water, so that the water in the water storage chamber 102 can circulate a little by little, thereby improving the cooling efficiency.

In order to improve the water pumping efficiency, a water suction cavity is formed in the middle of the driving impeller 5 close to the water inlet port 41, a plurality of driving blades 53 are arranged in the water suction cavity, a water drainage cavity 52 is radially formed in the outer side of the driving impeller 5, the water drainage cavity 52 is communicated with the water suction cavity, and the driving blades 53 extend into the water drainage cavity 52. The impeller 5 is driven to rotate so that water enters the water suction cavity after passing through the water inlet port 41, the direction of the water is changed under the action of the driving blades 53, and therefore the water is directly discharged from the side water discharge cavity 52, and efficient water pumping is guaranteed. Meanwhile, part of water enters the impeller cavity 44 through the gap between the driving impeller 5 and the impeller cavity 44, then overflows into the transition water cavity 45, and finally enters the water storage cavity 102 through the water through hole 22, so that the driving motor is cooled. The drive vane 53 is of unitary design, extending from the suction chamber into the drainage chamber 52, to make the water flow path most efficient.

Preferably, the pump housing 2 is provided with an oil chamber 24 on the inner side of the connecting disc 21, the water passing hole 22 is located outside the oil chamber 24, the end of the oil chamber 24 is provided with an oil sealing cover 3, and the driving motor passes through the oil chamber 24 and is fixedly connected with the driving impeller 5. The design of the water passing hole 22 can effectively improve the cooling of the oil chamber 24.

In order to guarantee a better cooling effect, the outer shell 1 is a cylinder with an opening at one end, the end of the outer shell 1 is fixedly connected with the pump shell 2, so that the water storage cavity 102 is sealed, the outer side wall of the pump shell 2 is provided with a plurality of reinforcing ribs 23, and gaps are reserved between the reinforcing ribs 23 and the inner side wall of the outer shell 1. The outer shell 1 and the pump shell 2 are thin as much as possible in wall thickness, heat exchange is facilitated, meanwhile, the reinforcing ribs 23 are designed to effectively guarantee strength, the space of the water storage cavity 102 is made to be as large as possible due to the thin wall thickness, therefore, more water can be contained, the water storage cavity 102 only keeps the water through hole 22 as a water inlet and outlet, water circulation can be slow, and water pumping efficiency cannot be influenced.

Preferably, the water inlet 413 and the driving impeller 5 are coaxially arranged, and the inner diameter of the water suction cavity is the same as the diameter of the water inlet 413. So that the water entering from the water inlet port 41 can enter the suction chamber as completely as possible and then be discharged from the drain chamber 52 directly by the action of the driving blade 53.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims

1. An amphibious water pump, characterized in that:

the device comprises a volute (4), a pump shell (2) and a driving motor, wherein the driving motor is fixed in the pump shell (2), and the outer wall of the driving motor is attached to the inner wall of the pump shell (2); an outer shell (1) is wrapped outside the pump shell (2), a water storage cavity (102) is formed between the outer shell (1) and the pump shell (2), the water storage cavity (102) is wrapped outside the pump shell (2), and a driving impeller (5) is arranged on an output shaft of the driving motor;

one end of the volute (4) is fixedly connected with the pump shell (2), an impeller cavity (44) is arranged at the end of the volute (4), the driving impeller (5) is located in the impeller cavity (44), the impeller cavity (44) is communicated with the water storage cavity (102), a water inlet port (41) is formed in the other end of the volute (4), a water outlet port (42) is formed in the side wall of the volute (4) in the tangential direction, the water outlet port (42) is located outside the impeller cavity (44), and the water inlet direction of the water inlet port (41) is the same as the length direction of the driving motor.

2. The amphibious water pump of claim 1, wherein:

a connecting hole (411) is formed in one end, connected with a water pipe, of the water inlet port (41), a water inlet hole (413) is formed in one end, close to the impeller cavity (44), of the water inlet port (41), and the diameter of the connecting hole (411) is larger than that of the water inlet hole (413);

a projection circle of the water inlet hole (413) on the section of the connecting hole (411) is internally tangent to the end of a projection dome of the connecting hole (411), a transition inclined plane (412) is arranged on the inner wall between the connecting hole (411) and the water inlet hole (413), and the transition inclined plane (412) continuously shrinks and extends to the water inlet hole (413) from the connecting hole (411);

the bottom end of the outside of the water inlet port (41) far away from the water inlet hole (413) is provided with a supporting leg (43) for installation and placement.

3. The amphibious water pump of claim 2, wherein:

a guide fin (414) is arranged at the center of the lower end of the transition inclined plane (412), a guide arc surface (4141) is arranged on one side, close to the connecting hole (411), of the guide fin (414), and the tail end of the guide fin (414) is located at the center of the water inlet hole (413).

4. The amphibious water pump of claim 1, wherein:

the water outlet port (42) comprises a volute runner pipe (422) arranged outside the impeller cavity (44); along the water outlet direction, the diameter of the volute runner pipe (422) is gradually increased;

the middle part of the volute flow passage pipe (422) is provided with a separation rib plate (421), so that the water outlet ends of the impeller cavities (44) are symmetrically distributed at two sides of the flow passage in the volute flow passage pipe (422).

5. The amphibious water pump of claim 1, wherein:

the pump shell (2) is integrally cast, a connecting disc (21) is arranged at one end, connected with the volute (4), of the pump shell (2), a plurality of water passing through holes (22) are formed in the connecting disc (21), the outer shell (1) is fixed at one end, far away from the volute (4), of the connecting disc (21), one end of each water passing through hole (22) is communicated with the impeller cavity (44), and the other end of each water passing through hole (22) is communicated with the water storage cavity (102) between the outer shell (1) and the pump shell (2);

the water passing through hole (22) is positioned on one side of the impeller cavity (44), and the length direction of the water passing through hole (22) is vertical to the end face of the driving impeller (5).

6. The amphibious water pump of claim 5, wherein:

one end of the volute (4) connected with the pump shell (2) is provided with a transition water cavity (45), the transition water cavity (45) is positioned on one side of the driving impeller (5) close to the pump shell (2), and the side of the driving impeller (5) is provided with a driving rib (54);

the transition water cavity (45) is communicated with the impeller cavity (44), and the water inlet end of the water through hole (22) is positioned in the transition water cavity (45).

7. The amphibious water pump of claim 1, wherein:

the middle part that drive impeller (5) are close to into water port (41) is provided with the chamber that absorbs water, it is provided with a plurality of drive vane (53) in the chamber to absorb water, the outside of drive impeller (5) is along radially being provided with drainage chamber (52), drainage chamber (52) with the chamber intercommunication that absorbs water, drive vane (53) extend to in drainage chamber (52).

8. The amphibious water pump of claim 5, wherein:

the pump case (2) is located the inboard of connection pad (21) is provided with grease chamber (24), it is located to cross water through-hole (22) the outside of grease chamber (24), the tip of grease chamber (24) is provided with oily sealed lid (3), driving motor passes grease chamber (24) with drive impeller (5) fixed connection.

9. The amphibious water pump of claim 1, wherein:

the utility model discloses a water storage device, including shell body (1), pump case (2), shell body (1) are one end open-ended barrel, the end of shell body (1) with pump case (2) fixed connection, so that water storage chamber (102) are sealed, the lateral wall of pump case (2) is provided with a plurality of strengthening ribs (23), strengthening rib (23) with leave the clearance between shell body (1) inside wall.

10. The amphibious water pump of claim 7, wherein:

the water inlet hole (413) and the driving impeller (5) are coaxially arranged, and the inner diameter of the water suction cavity is the same as the diameter of the water inlet hole (413).