High-speed water pump with sand-resistant structure
By setting rubber protective sleeves in the impeller shell and designing barrier wings, sand barrier holes and sand sinking chamber structures, the problem of sand cutting impeller shells in high-speed water pumps is solved, and the effective protection and service life of the impeller shells are achieved.
Patent Information
- Application Number
- CN202422072181.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-26
AI Technical Summary
When the existing high-speed water pumps flow at high speed with the water flow, the impeller shell is easily cut by the sand particles, resulting in a shortening of the service life.
A rubber-based protective sleeve is installed in the impeller shell. The inner wall of the protective sleeve is equipped with barrier wings and sand blocking holes. The protective sleeve buffers the impact force of the sand particles to reduce the cutting force. The protective pads and sand deposition cavity are designed to settle sand particles to avoid direct contact with the impeller shell.
Effectively protect the impeller shell, avoid sand cutting, extend service life, and reduce the risk of water leakage.
Smart Images
Figure CN223152408U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a water pump, in particular to a high-speed water pump with an anti-sand structure. Background Art
[0002] A water pump is a device for conveying water flow. When the water pump operates, the motor of the water pump drives the impeller inside the impeller housing to rotate. At this time, a suction force is generated at the water inlet hole of the water inlet seat below the water pump, sucking the water flow into the impeller housing, and finally flowing out from the water outlet of the water outlet housing at the top of the water pump to achieve the conveyance of the water flow. In order to increase the lift and flow rate of the water pump, the motor shaft of the motor is connected to a rotating shaft to extend the length of the motor shaft. At the same time, a plurality of impellers evenly distributed axially are arranged on the rotating shaft, and each impeller is covered with an impeller housing. The axially distributed impeller housings are stacked on top of each other, and the stacked impeller housings are just located between the water inlet seat and the water outlet housing. At this time, the water inlet seat and the water outlet housing are connected by a plurality of straps evenly distributed in a circle to fasten the plurality of impeller housings together.
[0003] During the actual water conveyance process of the water pump, sand grains are very likely to be mixed in the water flow. Therefore, when the impeller drives the water flow to flow at a high speed, the sand grains flow along with it. When the impeller rotates, the rotational force of the impeller will first throw the water flow inside the impeller housing outward, causing it to impact on the inner peripheral surface of the impeller housing. At this time, the sand grains mixed in the water flow are synchronously thrown onto the inner peripheral surface of the impeller housing. Under the high-speed flow of the water, the sand grains form a cutting force. Therefore, in the case where there is no anti-sand structure inside the impeller housing, when the sand grains are thrown onto the inner peripheral surface of the impeller housing, it is very easy to cut the inner peripheral surface of the impeller housing, and finally the impeller housing is cut and leaks water, seriously affecting the service life of the impeller housing. Summary of the Invention
[0004] The technical problem to be solved by the utility model is to provide a high-speed water pump with an anti-sand structure, which can effectively prevent sand grains from cutting the inner peripheral surface of the impeller housing when the sand grains flow at a high speed inside the impeller housing with the water flow, and ensure the service life of the impeller housing.
[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:
[0006] The utility model discloses a high-speed water pump with an anti-sand structure, which comprises a water inlet seat and a plurality of water inlet holes evenly arranged on the water inlet seat in a circumferential manner. A motor is arranged below the water inlet seat. The upper end of the motor shaft of the motor is connected with a rotating shaft through a coupling. A plurality of impellers are axially and evenly distributed on the rotating shaft. An impeller housing matching with the impeller is sleeved outside the impeller. The upper and lower adjacent impeller housings are in contact with each other. An outlet housing is arranged on the upper side of the impeller housing at the uppermost position. A water outlet is arranged at the center of the upper end face of the outlet housing. The impeller housing at the lowermost position is in contact with the water inlet seat. The outlet housing and the water inlet seat are connected by a plurality of straps evenly distributed in a circumferential manner. An annular limiting part extends inwards from the edge of the upper end port of the impeller housing; An annular folding part extends downwards from the inner wall of the limiting part; The folding part, the limiting part and the inner peripheral surface of the impeller housing enclose an annular limiting groove; An annular limiting boss is arranged on the lower surface of the impeller housing; The upper surface of the limiting part of the lower impeller housing in the upper and lower adjacent ones is in contact with the lower surface of the upper impeller housing; The folding part of the lower impeller housing in the upper and lower adjacent ones is sleeved outside the limiting boss of the upper impeller housing; A protective sleeve fitting with the inner wall of the impeller housing is arranged inside the impeller housing. The upper end of the protective sleeve is embedded in the limiting groove; The protective sleeve encloses the impeller; An annular groove is arranged on the inner wall of the lower side of the impeller housing, and the position of the groove corresponds to the position of the limiting boss; A protective pad matching with the groove bottom is arranged at the bottom of the groove; The protective pad and the protective sleeve are connected by a positioning structure; The protective pad, the protective sleeve and the positioning structure are integrally formed and are all made of rubber material.
[0007] The positioning structure includes a first auxiliary part extending inwards from the inner wall of the lower end port of the protective sleeve. The first auxiliary part is annular; The lower surface of the first auxiliary part is in contact with the inner wall of the lower side of the impeller housing; A second auxiliary part extending downwards in an annular shape extends from the inner wall of the first auxiliary part. The outer edge of the protective pad is connected with the lower end of the second auxiliary part; The outer wall of the second auxiliary part is in contact with the inner peripheral surface of the groove; The protective sleeve, the first auxiliary part, the second auxiliary part and the protective pad are integrally formed and are all made of rubber material.
[0008] An annular auxiliary boss is arranged on the lower surface of the outlet housing; The upper end surface of the impeller housing at the uppermost position is in contact with the lower surface of the outlet housing; The folding part of the impeller housing at the uppermost position is sleeved outside the auxiliary boss; An annular positioning part extends inwards from the inner wall of the upper end port of the water inlet seat. The positioning part is sleeved outside the limiting boss of the impeller housing at the lowermost position; The upper surface of the positioning part is in contact with the lower surface of the impeller housing at the lowermost position.
[0009] A plurality of blocking wings are evenly distributed in a circumferential manner on the inner wall of the protective sleeve; The blocking wings, the protective sleeve, the first auxiliary part, the second auxiliary part and the protective pad are integrally formed and are all made of rubber material.
[0010] A number of uniformly distributed sand blocking holes are provided on the blocking wing.
[0011] An annular sand settling part is provided on the upper surface of the protective pad; the sand settling part is integrally formed with the protective pad and both are made of rubber material; the outer wall of the sand settling part is fitted with the inner wall of the second auxiliary part; an annular notch is provided on the outer wall at the upper end of the sand settling part; an annular sand settling cavity is provided in the sand settling part; an annular sand settling channel is provided on the inner wall of the notch, and the notch is communicated with the sand settling cavity through the sand settling channel; the end of the sand settling channel communicated with the sand settling cavity is inclined downward; the upper surface of the first auxiliary part and the inner wall of the second auxiliary part are transitionally connected through an annular guiding arc surface.
[0012] An annular shielding curtain is provided on the inner wall on the upper side of the outer end port of the sand settling channel, and there is a sand inlet gap between the lower end surface of the shielding curtain and the inner wall on the lower side of the outer end port of the sand settling channel.
[0013] The beneficial effects of the present utility model are as follows:
[0014] Compared with the prior art, when the impeller of the high-speed water pump with an anti-sand structure adopting the structure of the present utility model drives the water flow to flow, the water flow rotates along with the impeller. At this time, the water flow forms a vortex, and the water flow is continuously thrown towards the inner peripheral surface of the impeller housing. And a protective sleeve is provided on the inner peripheral surface of the impeller housing and is fitted with it. At this moment, the protective sleeve can effectively replace the impeller housing, so that the water flow is directly thrown onto the inner wall of the protective sleeve. Thus, the sand grains mixed in the water flow directly impact on the protective sleeve. And the protective sleeve is made of rubber material. When the protective sleeve receives the impact of the sand grains, it will deform and generate elasticity. This elasticity can effectively buffer the impact force of the sand grains, effectively reduce the actual pressure acting on the inner wall of the protective sleeve by the sand grains, weaken the influence brought by the sand grain impact. And when the sand grains rotate and move on the inner wall of the protective sleeve along with the water flow, the protective sleeve can effectively slow down the cutting force generated by the rotation of the sand grains through the friction force between itself and the sand grains. Thus, the inner peripheral surface of the impeller housing is effectively protected by the protective sleeve, avoiding the situation that the inner peripheral surface of the impeller housing is directly contacted by the sand grains during the high-speed flow of the water flow and the impeller housing is cut. Effectively avoiding the situation that the impeller housing is cut by the sand grains and leaks water, thus effectively ensuring the service life of the impeller housing. Description of the Drawings
[0015] Figure 1 is a sectional view of the high-speed water pump with an anti-sand structure of the present utility model;
[0016] Figure 2 is a partial sectional view of the high-speed water pump with an anti-sand structure of the present utility model;
[0017] Figure 3 is a sectional view of the protective sleeve;
[0018] Figure 4 is a structural schematic diagram of the protective sleeve;
[0019] Figure 5 It is a sectional view when a blocking wing is provided on the inner wall of the protective sleeve and a sand settling part is provided on the upper surface of the protective pad;
[0020] Figure 6 It is a schematic structural view of a high-speed water pump with an anti-sand structure of the present utility model. Specific embodiments
[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0022] Please refer to Figures 1 to 6 , the present utility model provides a high-speed water pump with an anti-sand structure, including an inlet seat 1, a plurality of inlet holes 2 evenly arranged in a circle on the inlet seat 1. A motor is provided below the inlet seat 1. The upper end of the motor shaft of the motor is connected to a rotating shaft 4 through a coupling 3. A plurality of impellers 5 are axially and evenly distributed on the rotating shaft 4. The impeller 5 is covered with an impeller housing 6 that matches it. The upper and lower adjacent impeller housings 6 are in contact with each other. An outlet housing 7 is provided on the upper side of the uppermost impeller housing 6. A water outlet 8 is provided at the center of the upper end face of the outlet housing 7. The lowermost impeller housing 6 is in contact with the inlet seat 1. The outlet housing 7 and the inlet seat 1 are connected by a plurality of straps 9 evenly distributed in a circle. An annular limiting portion 10 extends inward from the edge of the upper end port of the impeller housing 6; an annular folding portion 11 extends downward from the inner wall of the limiting portion 10; the folding portion 11, the limiting portion 10 and the inner peripheral surface of the impeller housing 6 enclose an annular limiting groove 12; an annular limiting boss 13 is provided on the lower surface of the impeller housing 6; the upper surface of the limiting portion 10 of the lower impeller housing 6 in the upper and lower adjacent ones is in contact with the lower surface of the upper impeller housing 6; the folding portion 11 of the lower impeller housing 6 in the upper and lower adjacent ones is sleeved outside the limiting boss 13 of the upper impeller housing 6; a protective sleeve 14 that fits with its inner wall is provided in the impeller housing 6. The upper end of the protective sleeve 14 is embedded in the limiting groove 12; the protective sleeve 14 encloses the impeller 5; an annular groove 15 is provided on the lower inner wall of the impeller housing 6. The position of the groove 15 corresponds to the position of the limiting boss 13; a protective pad 16 that matches it is provided at the bottom of the groove 15; the protective pad 16 and the protective sleeve 14 are connected by a positioning structure; the protective pad 16, the protective sleeve 14 and the positioning structure are integrally formed and are all made of rubber material.
[0023] The positioning structure includes a first auxiliary part 17 extending inwards from the inner wall of the lower end port of the protective sleeve 14, and the first auxiliary part 17 is annular; the lower surface of the first auxiliary part 17 is attached to the inner wall of the lower side of the impeller housing 6; a second auxiliary part 18 in the shape of a ring extends downwards from the inner wall of the first auxiliary part 17, and the outer edge of the protective pad 16 is connected to the lower end of the second auxiliary part 18; the outer wall of the second auxiliary part 18 is attached to the inner peripheral surface of the groove 15; the protective sleeve 14, the first auxiliary part 17, the second auxiliary part 18 and the protective pad 16 are integrally formed and are all made of rubber material.
[0024] The lower surface of the water outlet housing 7 is provided with an annular auxiliary boss 19; the upper end surface of the uppermost impeller housing 6 is attached to the lower surface of the water outlet housing 7; the folded part 11 of the uppermost impeller housing 6 is sleeved outside the auxiliary boss 19; an annular positioning part 20 extends inwards from the inner wall of the upper end port of the water inlet seat 1, and the positioning part 20 is sleeved outside the limit boss 13 of the lowermost impeller housing 6; the upper surface of the positioning part 20 is attached to the lower surface of the lowermost impeller housing 6.
[0025] The inner wall of the protective sleeve 14 is provided with a number of blocking wings 21 evenly distributed in a circumferential manner; the blocking wings 21 are integrally formed with the protective sleeve 14, the first auxiliary part 17, the second auxiliary part 18 and the protective pad 16 and are all made of rubber material.
[0026] A number of evenly distributed sand blocking holes 22 are provided on the blocking wings 21.
[0027] The upper surface of the protective pad 16 is provided with an annular sand settling part 23; the sand settling part 23 is integrally formed with the protective pad 16 and is all made of rubber material; the outer wall of the sand settling part 23 is attached to the inner wall of the second auxiliary part 18; an annular notch 24 is provided on the upper outer wall of the sand settling part 23; an annular sand settling cavity 25 is provided inside the sand settling part 23; an annular sand settling channel 26 is provided on the inner wall of the notch 24, and the notch 24 is communicated with the sand settling cavity 25 through the sand settling channel 26; the end of the sand settling channel 26 communicated with the sand settling cavity 25 is inclined downwards; the upper surface of the first auxiliary part 17 and the inner wall of the second auxiliary part 18 are connected by an annular guiding arc surface 27 in a transitional manner.
[0028] An annular shielding curtain 28 is provided on the upper side inner wall of the outer end port of the sand settling channel 26, and there is a sand inlet gap 29 between the lower end surface of the shielding curtain 28 and the lower side inner wall of the outer end port of the sand settling channel 26.
[0029] The usage method of the present utility model is as follows:
[0030] When a high-speed water pump needs to be used, the motor of the high-speed water pump can be started. At this time, the upper end of the motor shaft of the motor will drive the rotating shaft 4 to rotate through the coupling 3. When the rotating shaft 4 rotates, all the impellers 5 rotate synchronously. At this time, the impellers 5 will drive the water flow filled in the impeller housing 6 to flow, so that suction is generated at the water inlet hole 2 of the water inlet seat 1, continuously sucking the external water flow into the water inlet seat 1, and continuously towards the impeller housing 6. Driven by the impeller 5, finally the water flow flows out through the water outlet on the water outlet housing 7.
[0031] When the impeller 5 drives the water flow to flow, the water flow rotates with the impeller 5. At this time, the water flow forms a vortex, and the water flow is continuously thrown towards the inner peripheral surface of the impeller housing 6. The inner peripheral surface of the impeller housing 6 is provided with a protective sleeve 14 that fits it. At this moment, the protective sleeve 14 can effectively replace the impeller housing 6, so that the water flow is directly thrown onto the inner wall of the protective sleeve 14, so that the sand grains mixed in the water flow directly impact on the protective sleeve 14. The protective sleeve 14 is made of rubber material. When the protective sleeve 14 is impacted by sand grains, it will deform and generate elasticity. This elasticity can effectively buffer the impact force of the sand grains, effectively reduce the actual pressure of the sand grains acting on the inner wall of the protective sleeve 14, weaken the impact of the sand grain impact, and when the sand grains rotate and move on the inner wall of the protective sleeve 14 with the water flow, the protective sleeve 14 can effectively slow down the cutting force generated by the rotation of the sand grains through the friction between itself and the sand grains, thereby effectively protecting the inner peripheral surface of the impeller housing 6 through the protective sleeve 14, avoiding the situation that the inner peripheral surface of the impeller housing 6 is directly contacted by sand grains when the water flow is flowing at high speed and causing the impeller housing 6 to be cut, effectively avoiding the situation that the impeller housing 6 is cut by sand grains and causes water leakage, thereby effectively ensuring the service life of the impeller housing 6.
[0032] When the sand grains rotate and flow in the impeller housing 6 with the water flow, due to the characteristic effect of the centrifugal force generated by the rotation of the impeller 5, the inner peripheral surface of the impeller housing 6 is the most severely pressured, while the pressure on the inner walls of the upper and lower sides of the impeller housing 6 is relatively small. The damage that the sand grains can cause to the inner walls of the upper and lower sides of the impeller housing 6 is extremely limited. And because the water flow can continuously transport the water flow upward through the upper side port of the impeller housing 6, it can further release the water flow pressure, thereby further reducing the pressure of the sand grains acting on the upper side inner wall of the impeller housing 6. Therefore, no anti-sand structure needs to be set on the upper side inner wall of the impeller housing 6. The pressure on the lower side inner wall of the impeller housing 6 is greater than that on the upper side inner wall of the impeller housing 6, so a protective pad 16 can be set as an anti-sand structure. The existence of the protective pad 16 can not only improve the stability of the protective sleeve 14, but also effectively replace the lower side inner wall of the impeller housing 6 to directly contact with the sand grains in the water flow, thereby effectively avoiding the situation that the sand grains damage the lower side inner wall of the impeller housing 6 under the high-speed drive of the water flow.
[0033] The upper end of the protective sleeve 14 is embedded in the limiting groove 12, which can effectively protect the stability of the upper end of the protective sleeve 14. The lower surface of the first auxiliary part 17 is attached to the inner wall of the lower side of the impeller housing 6, and the outer wall of the second auxiliary part 18 is attached to the inner peripheral surface of the groove 15, which can effectively ensure the stability of the lower end of the protective sleeve 14, so that the protective sleeve 14 is always closely attached to the inner peripheral surface of the impeller housing 6 when the water flows, avoiding the loosening of the protective sleeve 14 and the protective pad 16 affected by the water flow, and further ensuring the stability of the protective sleeve 14 when resisting sand.
[0034] An annular auxiliary boss 19 is provided on the lower surface of the water outlet housing 7. The upper end surface of the uppermost impeller housing 6 is attached to the lower surface of the water outlet housing 7. The folded part 11 of the uppermost impeller housing 6 is sleeved outside the auxiliary boss 19. An annular positioning part 20 extends inward from the inner wall of the upper end port of the water inlet seat 1. The positioning part 20 is sleeved outside the limiting boss 13 of the lowermost impeller housing 6. The upper surface of the positioning part 20 is attached to the lower surface of the lowermost impeller housing 6. This fixing method can ensure the stability of multiple impeller housings 6 when the water outlet housing 7 and the water inlet seat 1 are connected and tightened, avoiding the situation that the impeller directly contacts the inner wall of the protective sleeve 14 due to the eccentricity of the impeller housing 6, resulting in the damage of the protective sleeve 14 cut by the impeller 5.
[0035] A number of blocking wings 21 are evenly distributed in a circle on the inner wall of the protective sleeve 14. The blocking wings 21 are integrally formed with the protective sleeve 14, the first auxiliary part 17, the second auxiliary part 18 and the protective pad 16 and are all made of rubber. The blocking wings 21 can block the sand grains when the sand grains rotate and cut along the inner wall track of the protective sleeve 14, effectively inhibiting the rotational cutting force of the sand grains, further weakening the influence of the sand grains on the protective sleeve 14, and effectively prolonging the service life of the protective sleeve 14.
[0036] A number of evenly distributed sand blocking holes 22 are provided on the blocking wings 21. When the blocking wings 21 block the rotating and cutting sand grains, some sand grains will directly get stuck in the sand blocking holes 22. The sand blocking holes 22 are small-diameter holes, which can hold the sand and gravel by themselves, further delaying the rotational cutting speed of the sand grains, thereby reducing the destructive power of the sand grains and further improving the anti-sand effect.
[0037] The upper surface of the protective pad 16 is provided with an annular sand-settling part 23. The sand-settling part 23 is integrally formed with the protective pad 16 and both are made of rubber. The outer wall of the sand-settling part 23 is fitted with the inner wall of the second auxiliary part 18. The upper outer wall of the sand-settling part 23 is provided with an annular notch 24. An annular sand-settling cavity 25 is arranged inside the sand-settling part 23. An annular sand-settling channel 26 is arranged on the inner wall of the notch 24. The notch 24 is communicated with the sand-settling cavity 25 through the sand-settling channel 26. The upper surface of the first auxiliary part 17 and the inner wall of the second auxiliary part 18 are connected by an annular guiding arc surface 27 for transition connection. When the sand grains are buffered and decelerated by the protective sleeve 14, some of the sand grains will precipitate downward. At this time, the sand grains can sequentially pass through the notch 24 and the sand-settling channel 26 and enter the sand-settling cavity 25. The existence of the guiding arc surface 27 enables the sand grains to quickly enter the notch 24. After the sand grains precipitate in the sand-settling cavity 25, the number of sand grains mixed in the water flow decreases, and the destructive force that the water flow can form by carrying the sand grains drops sharply, thereby further ensuring the service life of the impeller housing 6.
[0038] An annular shielding curtain 28 is arranged on the upper inner wall of the outer end port of the sand-settling channel 26. There is a sand inlet gap 29 between the lower end surface of the shielding curtain 28 and the lower inner wall of the outer end port of the sand-settling channel 26. The existence of the sand inlet gap 29 allows the sand grains in the notch to enter the sand-settling channel 26 and thus enter the sand-settling cavity 25. One end of the sand-settling channel 26 communicating with the sand-settling cavity 25 is inclined downward. Coupled with the blocking of the shielding curtain 28, once the sand grains precipitate into the sand-settling cavity 25, it is extremely difficult for them to return to the impeller housing 6 from the sand-settling cavity 25, effectively ensuring the sand-settling effect.
Claims
1. A high-speed water pump with an anti-sand structure, comprising an inlet seat, a plurality of inlet holes evenly arranged in a circle on the inlet seat, a motor is provided below the inlet seat, the upper end of the motor shaft of the motor is connected to a rotating shaft through a coupling, a plurality of impellers evenly distributed axially are arranged on the rotating shaft, an impeller housing matching with the impeller is sleeved outside the impeller, the upper and lower adjacent impeller housings are in contact with each other, an outlet housing is provided on the upper side of the impeller housing at the uppermost position, a water outlet is provided at the center of the upper end face of the outlet housing, the impeller housing at the lowermost position is in contact with the inlet seat, and the outlet housing and the inlet seat are connected by a plurality of straps evenly distributed in a circle, and the characteristics are as follows: An annular limiting portion extends inwards from the edge of the upper end port of the impeller housing; an annular folding portion extends downwards from the inner wall of the limiting portion; the folding portion, the limiting portion and the inner peripheral surface of the impeller housing enclose an annular limiting groove; an annular limiting boss is provided on the lower surface of the impeller housing; the upper surface of the limiting portion of the lower impeller housing adjacent up and down is attached to the lower surface of the upper impeller housing; the folding portion of the lower impeller housing adjacent up and down is sleeved outside the limiting boss of the upper impeller housing; a protective sleeve that fits with the inner wall of the impeller housing is provided inside the impeller housing, and the upper end of the protective sleeve is embedded in the limiting groove; the protective sleeve encloses the impeller; an annular groove is provided on the inner wall of the lower side of the impeller housing, and the position of the groove corresponds to the position of the limiting boss; a protective pad that matches the groove is provided at the bottom of the groove; the protective pad and the protective sleeve are connected by a positioning structure; the protective pad, the protective sleeve and the positioning structure are integrally formed and are all made of rubber material.
2. The high-speed water pump with a sand-resistant structure according to claim 1, characterized in that: The positioning structure includes a first auxiliary portion that extends inwards from the inner wall of the lower end port of the protective sleeve, and the first auxiliary portion is annular; the lower surface of the first auxiliary portion is attached to the inner wall of the lower side of the impeller housing; a second auxiliary portion that is annular extends downwards from the inner wall of the first auxiliary portion, and the outer edge of the protective pad is connected to the lower end of the second auxiliary portion; the outer wall of the second auxiliary portion is attached to the inner peripheral surface of the groove; the protective sleeve, the first auxiliary portion, the second auxiliary portion and the protective pad are integrally formed and are all made of rubber material.
3. The high-speed water pump with an anti-sand structure according to claim 1, characterized in that: An annular auxiliary boss is provided on the lower surface of the water outlet housing; the upper end surface of the uppermost impeller housing is attached to the lower surface of the water outlet housing; the folding portion of the uppermost impeller housing is sleeved outside the auxiliary boss; an annular positioning portion extends inwards from the inner wall of the upper end port of the water inlet seat, and the positioning portion is sleeved outside the limiting boss of the lowermost impeller housing; the upper surface of the positioning portion is attached to the lower surface of the lowermost impeller housing.
4. The high-speed water pump with an anti-sand structure according to claim 1, characterized in that: A plurality of blocking wings are provided on the inner wall of the protective sleeve and are evenly distributed in a circumferential manner; the blocking wings, the protective sleeve, the first auxiliary portion, the second auxiliary portion and the protective pad are integrally formed and are all made of rubber material.
5. The high-speed water pump with a sand resistance structure according to claim 4, characterized in that: A plurality of evenly distributed sand blocking holes are provided on the blocking wings.
6. The high-speed water pump with a sand-resistant structure according to claim 2, wherein: An annular sand settling portion is provided on the upper surface of the protective pad; the sand settling portion and the protective pad are integrally formed and are all made of rubber material; the outer wall of the sand settling portion is attached to the inner wall of the second auxiliary portion; an annular notch is provided on the upper outer wall of the sand settling portion; an annular sand settling cavity is provided inside the sand settling portion; an annular sand settling channel is provided on the inner wall of the notch, and the notch is communicated with the sand settling cavity through the sand settling channel; the end of the sand settling channel communicated with the sand settling cavity is inclined downwards; the upper surface of the first auxiliary portion and the inner wall of the second auxiliary portion are connected by an annular guiding arc surface for transition.
7. The high-speed water pump with a sand-resistant structure according to claim 6, characterized in that: An annular shielding curtain is provided on the upper inner wall of the outer end port of the sand settling channel, and there is a sand inlet gap between the lower end surface of the shielding curtain and the lower inner wall of the outer end port of the sand settling channel.