Buffering structure of water pump

Abstract

The invention relates to the field of water pumps, in particular to a water pump buffering structure which comprises a pump shell and a buffering plate, a water inlet and a water supplementing opening are formed in the surface of the pump shell at intervals and communicate with an inner cavity of the pump shell, the buffering plate is connected to the inner wall of the pump shell, and one end of the buffering plate is located between the water inlet and the water supplementing opening. A buffering gap for water to pass through is reserved between the other end of the buffering plate and the inner wall of the pump shell, water enters an inner cavity of the pump shell through the water supplementing opening and impacts the plate face of the buffering plate, and the plate face of the buffering plate guides the water to enter the water inlet from the buffering gap. The pump shell and the buffer plate are arranged, the plate face of the buffer plate is used for bearing water flow, air and water are fully mixed in an inner cavity of the pump shell and decelerated, bubbles can be further compressed through the local pressurization effect of the buffer gap, air is prevented from entering the water inlet, it is guaranteed that the air does not occupy the space of a water inlet runner easily, and the actually conveyed liquid amount is increased; flow and lift of the water pump are guaranteed.

Description

Technical Field

[0001] This application relates to the field of water pumps, and more particularly to a water pump buffer structure. Background Technology

[0002] Water pumps mainly utilize power equipment to drive the impeller to rotate, generating centrifugal force. This causes the liquid between the blades to rotate as well, and under the action of centrifugal force, it is thrown out of the impeller and enters the pump casing. As the liquid is continuously thrown out, a low-pressure zone is formed at the center of the impeller. Under the action of atmospheric pressure, the external liquid is drawn into the center of the impeller, thus realizing the continuous delivery of liquid.

[0003] When the water pump is running, water enters the pump inlet from the pump casing through the pump casing cavity. The air in the pump casing cavity opposes the water and carries the air into the inlet. The air bubbles occupy part of the flow channel space in the inlet, resulting in a reduction in the actual amount of liquid transported, causing a significant decrease in the pump's flow rate and head. Summary of the Invention

[0004] To improve the problem of water and air colliding inside the pump casing and causing air to enter the inlet, this application provides a water pump buffer structure.

[0005] This application provides a water pump buffer structure, which adopts the following technical solution: A water pump buffer structure includes a pump casing and a buffer plate. The surface of the pump casing is provided with an inlet and a outlet, which are spaced apart and are connected to the inner cavity of the pump casing. The buffer plate is connected to the inner wall of the pump casing. One end of the buffer plate is located between the inlet and the outlet, and a buffer gap is left between the other end of the buffer plate and the inner wall of the pump casing to allow water to pass through. Water enters the inner cavity of the pump casing through the outlet and impacts the surface of the buffer plate. The surface of the buffer plate guides the water to enter the inlet from the buffer gap.

[0006] By adopting the above technical solution, when the water pump is running, water enters the pump casing cavity through the water inlet and impacts the buffer plate surface, preventing air and water inside the pump casing from being directly drawn into the inlet. At the same time, the buffer plate surface guides water into the inlet from the buffer gap. The buffer plate surface is used to receive the water flow, allowing air and water to mix fully and slow down in the pump casing cavity. The local pressurization effect of the buffer gap can further compress air bubbles, preventing air from entering the inlet and ensuring that air does not easily occupy the inlet flow channel space, thereby increasing the actual amount of liquid transported and ensuring the pump's flow rate and head.

[0007] Optionally, the surface of the buffer plate facing the water inlet is provided with a buffer surface. The inclination height of the buffer surface increases as the distance to the water inlet decreases. The buffer surface is used to receive water flow and guide the water flow into the buffer gap.

[0008] By adopting the above technical solution, the inclination height of the buffer surface increases as the distance to the water inlet decreases. The gradient inclination design of the buffer surface gradually increases the inclination height, causing the water flow to decelerate in stages along the slope. The inclination of the end face near the water inlet is relatively gentle, and the water flow initially diffuses, avoiding local high pressure. The inclination of the end face near the buffer gap becomes steeper, and the water flow is further decelerated and changes direction to enter the buffer gap. The remaining kinetic energy is absorbed by the buffer surface and converted into heat energy or micro eddy energy dissipation, reducing turbulence and backflow losses.

[0009] Optionally, the surface of the buffer plate facing the water inlet is provided with a guide surface, the inclination height of which decreases as the distance to the water inlet decreases, and the guide surface is used to receive the water flow and guide the water flow into the water inlet.

[0010] By adopting the above technical solution, the end face near the buffer gap has a gentle inclination and a low water flow velocity. The guide surface disperses the water flow impact force through a large-area contact, gradually guiding the water flow towards the inlet. This gradual guidance can avoid turbulence caused by sudden changes in water flow direction and reduce energy loss. At the same time, the end face near the inlet has a steep inclination and an increased water flow velocity. The guide surface forcibly changes the water flow direction, forming a jet effect, and accurately focuses the water flow to the center of the inlet, thereby ensuring that the water flow enters the impeller at the optimal angle and reduces impact loss.

[0011] Optionally, the buffer plate has a guide surface at the end facing the buffer gap. The guide surface is in the shape of a circular arc protrusion and is used to receive water flow and guide the water flow into the guide surface.

[0012] By adopting the above technical solution, the guide surface is in the shape of a circular arc protrusion. The circular arc surface, through continuous and gradual contact, evenly distributes the impact force of the water flow to the entire surface, avoiding local high pressure concentration. The water flow smoothly transitions along the circular arc surface, reducing kinetic energy loss caused by sudden changes in direction. This design can ensure that the water flow enters the guide surface at a higher speed, thereby improving the overall efficiency.

[0013] Optionally, the end face of the buffer plate connected to the inner wall of the pump casing is provided with a reinforcing surface, the reinforcing surface is arc-shaped, and the centerline of the reinforcing surface faces the inner cavity of the pump casing.

[0014] By adopting the above technical solution, the reinforced surface is arc-shaped. The arc-shaped surface gradually transitions to disperse the concentrated stress to the entire surface, avoiding local stress peaks. At the same time, the centerline of the reinforced surface faces the inner cavity of the pump casing, further enhancing the structural strength of the buffer plate through the arch effect. It can absorb some impact energy through small elastic deformation, reduce the load transmitted to the pump casing, and protect the pump casing from damage.

[0015] Optionally, it also includes a motor, an impeller, and a shielding sleeve. The motor is connected to the surface of the pump casing. The end of the motor shaft is embedded in the inner cavity of the pump casing and faces the inlet. The impeller is coaxially connected to the motor shaft. A shielding hole is coaxially opened on the inner wall of the inlet. The axis of the shielding hole coincides with the axis of the motor. The outer ring of the shielding sleeve is coaxially embedded in the inner wall of the shielding hole. A sealing hole is coaxially opened on the end face of the impeller for the end of the shielding sleeve to be embedded. The outer peripheral surface of the shielding sleeve abuts against the inner wall of the sealing hole to form a limit.

[0016] By adopting the above technical solution, one end of the shielding sleeve along the axial direction is embedded in the shielding hole, and the other end along the axial direction is embedded in the sealing hole. The outer circumferential surface of the shielding sleeve abuts against the inner wall of the shielding hole to form a fixation, and the outer circumferential surface of the shielding sleeve abuts against the inner wall of the sealing hole to form a limit. When the motor shaft rotates at high speed, the shielding sleeve is reduced from swaying due to centrifugal force or water flow impact, making the motor less prone to accelerated wear due to vibration, thereby extending the service life of the water pump. In addition, the motor drives the impeller to rotate, and the inlet cavity is under negative pressure, pushing water from the water inlet into the pump casing cavity and impacting the buffer plate surface. The buffer plate surface guides the water flow from the buffer gap into the inlet. The air in the pump casing dissolves in the water, and the water drives... Air is expelled, achieving water and air separation without disturbing the water. When air is mixed in the inlet, water from the pump casing immediately enters the inlet, ensuring a constant water supply. Simultaneously, the guide surface faces the shielding sleeve opening, directing the water flow from the pump casing to the inner ring of the shielding sleeve. This allows the liquid to pass through the tight gap between the shielding sleeve and the inner wall of the shielding hole before entering the inlet. The water pressure creates an inward pressing force on the outer ring of the shielding sleeve, enhancing the static sealing effect. When the pump stops, the water flow reverses, and the guide surface prevents water from directly impacting the tight mating surface between the inner ring of the shielding sleeve and the inner wall of the sealing hole, avoiding seal failure due to sudden pressure changes and extending the pump's service life.

[0017] Optionally, the shielding sleeve includes an adjusting ring, a moving ring, and a fixed ring. The end face of the adjusting ring is coaxially fixed to the end face of the moving ring. The inner wall of the fixed ring has a moving cavity coaxially formed for the outer ring of the moving ring to be embedded. The inner diameter of the moving cavity is larger than the outer diameter of the moving ring. The outer ring of the fixed ring is coaxially embedded in the inner wall of the shielding hole. The end of the adjusting ring is coaxially embedded in the sealing hole, and the outer wall of the adjusting ring abuts against the inner wall of the sealing hole to form a limiting position.

[0018] By adopting the above technical solution, during the actual assembly of the water pump, when the fixed ring is coaxially embedded in the inner wall of the shielding hole, the position of the moving ring in the moving cavity is adjusted and the end of the adjusting ring is driven to be embedded in the sealing hole. The outer circumferential surface of the adjusting ring presses against the inner wall of the sealing hole to form a limit, thereby realizing the automatic adaptation of the concentricity error between the adjusting ring and the impeller, thus improving the assembly quality of the water pump.

[0019] Optionally, the shielding sleeve further includes multiple elastic arc blocks, one end of each elastic arc block being connected at intervals to the outer circumferential surface of the moving ring, and multiple deformation cavities for accommodating the elastic arc blocks being spaced apart on the inner wall of the moving cavity, with the outer arc surface of each elastic arc block abutting against the inner wall of the deformation cavity.

[0020] By adopting the above technical solution, when the water pump starts, stops, or the medium flow changes suddenly, the water flow impact can easily cause the moving ring to vibrate. The elastic arc block, as an elastic support element, can absorb part of the impact energy and reduce the vibration transmission to the fixed ring. The elastic arc block disperses the concentrated stress to multiple contact points, reducing the risk of stress concentration in the fixed ring layout and avoiding the occurrence of crack propagation in the fixed ring due to stress concentration.

[0021] Optionally, the fixing ring includes a fitting part and a pressing part. The outer ring of the fitting part is coaxially embedded in the inner wall of the shielding hole. The end face of the fitting part is coaxially provided with a pressing cavity for the pressing part to be inserted. The outer peripheral surface of the pressing part presses against the inner wall of the pressing cavity to form a fixation. The moving cavity is located between the pressing part and the fitting part. The deformation cavity is located on the fitting part.

[0022] By adopting the above technical solution, the clamping part is embedded in the clamping cavity, and the outer peripheral surface of the clamping part is pressed against the inner wall of the clamping cavity to form an interference fit, which can withstand axial and radial loads. The outer ring of the fitting part is coaxially embedded in the inner wall of the shielding hole, and the inner ring of the fitting part is coaxially provided with a clamping cavity, which disperses the concentrated stress to multiple contact surfaces of the fitting part, avoids local overload of the fixing ring, and thus improves the service life of the shielding sleeve.

[0023] Optionally, the inner ring of the fitting portion is for the impeller end to be inserted, and a moving gap is left between the outer circumferential surface of the impeller and the inner ring wall of the fitting portion for the adjustment ring to move.

[0024] By adopting the above technical solution, a moving gap is left between the outer circumferential surface of the impeller and the inner ring wall of the fitting part for the adjustment ring to move. The moving gap provides radial movement space for the adjustment ring, so that the gap between the impeller and the fitting part can be adjusted according to the actual working conditions. The moving gap can disperse the radial force generated when the impeller rotates, avoid stress concentration in the fitting part or the end of the impeller, reduce the risk of fatigue cracks between the impeller and the fitting part, and thus extend the service life of the water pump.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The pump casing and buffer plate are designed to receive water flow, allowing air and water to mix fully and slow down in the pump casing cavity. The local pressure increase effect of the buffer gap can further compress air bubbles, preventing air from entering the inlet and ensuring that air does not occupy the inlet flow channel space, thereby increasing the actual amount of liquid transported and ensuring the pump's flow rate and head. The buffer surface further slows down the water flow and changes its direction to enter the buffer gap. The remaining kinetic energy is absorbed by the buffer surface and converted into heat energy or dissipated energy of tiny eddies, reducing turbulence and backflow losses. The guide surface is designed to forcibly change the direction of water flow, creating a jet effect that precisely focuses the water flow to the center of the inlet, thereby ensuring that the water enters the impeller at the optimal angle and reducing impact loss. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0027] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0028] Figure 3 yes Figure 2 The enlarged view at point A mainly shows the shielding sleeve.

[0029] Explanation of reference numerals in the attached drawings: 1. Pump casing; 11. Inlet; 12. Shielding hole; 13. Water supply port; 14. Buffer gap; 2. Buffer plate; 21. Guide surface; 22. Buffer surface; 23. Guide surface; 24. Reinforcing surface; 3. Motor; 4. Impeller; 41. Sealing hole; 42. Moving gap; 5. Shielding sleeve; 51. Adjusting ring; 52. Moving ring; 53. Fixed ring; 531. Fitting part; 532. Pressing part; 533. Pressing cavity; 534. Moving cavity; 535. Deformation cavity; 54. Elastic arc block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a water pump buffer structure. (Refer to...) Figure 1 and Figure 2 The water pump buffer structure includes a pump casing 1, a buffer plate 2, a motor 3, an impeller 4, and a shielding sleeve 5. The motor 3 is fixed to the surface of the pump casing 1 by bolts. The end of the motor 3 shaft is embedded in the inner cavity of the pump casing 1. The pump casing 1 has an inlet 11 on the inner wall facing the motor 3 shaft. The axis of the inlet 11 coincides with the axis of the motor 3. The inlet 11 has a shielding hole 12 coaxially opened on the inner wall near the motor 3 shaft. The outer ring wall of the shielding sleeve 5 is coaxially embedded in the inner wall of the shielding hole 12. One end of the impeller 4 is coaxially connected to the motor 3 shaft. The other end of the impeller 4 has a sealing hole 41 coaxially opened for the end of the shielding sleeve 5 to be embedded. The outer circumferential surface of the shielding sleeve 5 abuts against the inner wall of the sealing hole 41 to form a limit.

[0032] Reference Figure 2 and Figure 3The pump casing 1 has a water inlet 13 on its surface, which connects to the inner cavity of the pump casing 1. In this embodiment, the buffer plate 2 is an arc-shaped plate, which is integrally formed and fixed to the inner wall of the pump casing 1. The axis of the buffer plate 2 faces the water inlet 13. One end of the buffer plate 2 is located between the water inlet 11 and the water inlet 13. The other end of the buffer plate 2 and the inner wall of the pump casing 1 have a buffer gap 14 for water supply. Water enters the inner cavity of the pump casing 1 through the water inlet 13 and impacts the surface of the buffer plate 2. The surface of the buffer plate 2 guides the water to enter the water inlet 11 from the buffer gap 14. The surface of the buffer plate 2 is used to receive the water flow, preventing the air and water in the pump casing 1 from directly colliding and being sucked into the water inlet 11. This allows the air and water to mix fully and slow down in the inner cavity of the pump casing 1. The local pressure increase effect of the buffer gap 14 can further compress the air bubbles, preventing air from entering the water inlet 11 and ensuring that air does not easily occupy the flow channel space of the water inlet 11, thereby increasing the actual amount of liquid transported and ensuring the flow rate and head of the water pump.

[0033] Reference Figure 2 and Figure 3 The buffer plate 2 has a guide surface 21 on its surface facing the inlet 11. The inclination height of the guide surface 21 decreases as the distance to the shielding sleeve 5 decreases. The guide surface 21 is used to receive the water flow and guide the water flow through the inner cavity of the shielding sleeve 5 into the inlet 11. Before entering the inlet 11, the liquid passes through the tight gap between the shielding sleeve 5 and the inner wall of the shielding hole 12. The water flow pressure forms an inward pressing force on the outer ring of the shielding sleeve 5, which enhances the static sealing effect. When the machine stops, the water flow reverses. The guide surface 21 will prevent the water from directly impacting the tight mating surface between the inner ring of the shielding sleeve 5 and the inner wall of the sealing hole 41, avoiding sealing failure due to sudden pressure changes, thereby extending the service life of the water pump.

[0034] Reference Figure 2 and Figure 3 The buffer plate 2 has a buffer surface 22 on the surface facing the water inlet 13. The inclination height of the buffer surface 22 increases as the distance to the water inlet 13 decreases. The buffer surface 22 is used to receive the water flow and guide the water flow into the buffer gap 14. The gradient inclination design of the buffer surface 22 gradually increases the inclination height so that the water flow decelerates in stages along the slope. The inclination of the end face near the water inlet 13 is gentler, and the water flow initially diffuses to avoid local high pressure. The inclination of the end face near the buffer gap 14 becomes steeper, and the water flow decelerates further and changes direction to enter the buffer gap 14. The remaining kinetic energy is absorbed by the buffer surface 22 and converted into heat energy or micro eddy energy dissipation, reducing turbulence and backflow losses.

[0035] Reference Figure 2 and Figure 3The buffer plate 2 has a guide surface 23 at the end facing the buffer gap 14. The guide surface 23 is in the shape of a circular arc protrusion. The guide surface 23 is used to receive the water flow and guide the water flow into the guide surface 21. The circular arc surface distributes the water flow impact force evenly to the entire surface through continuous and gradual contact, avoiding local high pressure concentration. The water flow smoothly transitions along the circular arc surface, reducing the kinetic energy loss caused by sudden change of direction. This design can ensure that the water flow enters the guide surface 21 at a higher speed, thereby improving the overall efficiency.

[0036] Reference Figure 2 and Figure 3 The end face where the buffer plate 2 connects to the inner wall of the pump casing 1 is provided with a reinforcing surface 24. The reinforcing surface 24 is arc-shaped, and the axis of the reinforcing surface 24 faces the inner cavity of the pump casing 1. The arc-shaped surface disperses the concentrated stress to the entire surface through a continuous and gradual transition, avoiding local stress peaks. At the same time, the axis of the reinforcing surface 24 faces the inner cavity of the pump casing 1, further enhancing the structural strength of the buffer plate 2 through the arch effect. It can absorb part of the impact energy through small elastic deformation, reduce the load transmitted to the pump casing 1, and protect the pump casing 1 from damage.

[0037] Reference Figure 2 and Figure 3 The shielding sleeve 5 includes an adjusting ring 51, a moving ring 52, a fixed ring 53, and a plurality of elastic arc blocks 54. In this embodiment, the adjusting ring 51, the moving ring 52, and the fixed ring 53 are all circular rings. The end face of the adjusting ring 51 is integrally formed and fixed to the end face of the moving ring 52. The inner diameter of the adjusting ring 51 is equal to the inner diameter of the moving ring 52, and the outer diameter of the adjusting ring 51 is smaller than the outer diameter of the moving ring 52. One end of the plurality of elastic arc blocks 54 in the arc direction is evenly connected to the outer circumferential surface of the moving ring 52 around the axis of the moving ring 52, and the outer arc surface of the elastic arc blocks 54 is close to the adjusting ring 51.

[0038] Reference Figure 2 and Figure 3 The fixing ring 53 includes a fitting part 531 and a pressing part 532. The outer ring of the fitting part 531 is coaxially embedded in the inner wall of the shielding hole 12. The inner ring of the fitting part 531 is for the end of the impeller 4 to be embedded. The end face of the fitting part 531 facing the guide surface 21 is coaxially provided with a pressing cavity 533 for the pressing part 532 to be embedded. The outer peripheral surface of the pressing part 532 presses against the inner wall of the pressing cavity 533 to form a fixation. A moving cavity 534 is left between the pressing part 532 and the fitting part 531 for the moving ring 52 to move. The inner diameter of the moving cavity 534 is larger than the outer diameter of the moving ring 52. The fitting part 531 and the pressing part 532 clamp the two sides of the moving ring 52 in the axial direction to form a limit. The end face of the pressing part 532 away from the moving ring 52 presses against the bottom wall of the shielding hole 12 to form a limit.

[0039] Reference Figure 2 and Figure 3The fitting part 531 is provided with a plurality of deformation cavities 535 that accommodate elastic arc blocks 54 at intervals on the inner wall of the moving cavity 534. The outer arc surface of the elastic arc block 54 abuts against the inner wall of the deformation cavity 535. When the water pump starts, stops or the medium flow changes suddenly, the water flow impact can easily cause the moving ring 52 to vibrate. As an elastic support element, the elastic arc block 54 can absorb part of the impact energy and reduce the vibration transmission to the fixed ring 53. The elastic arc block 54 disperses the concentrated stress to multiple contact points, reduces the risk of stress concentration in the fixed ring 53 layout, and avoids the occurrence of crack propagation in the fixed ring 53 due to stress concentration.

[0040] Reference Figure 2 and Figure 3 The end of the adjusting ring 51 away from the moving ring 52 along the axial direction is embedded in the sealing hole 41. The outer circumferential surface of the adjusting ring 51 abuts against the inner wall of the sealing hole 41 to form a limit. A moving gap 42 is left between the outer circumferential surface of the impeller 4 and the inner ring wall of the fitting part 531 for the adjusting ring 51 to move. The moving gap 42 provides radial movement space for the adjusting ring 51, so that the gap between the impeller 4 and the fitting part 531 can be adjusted according to the actual working conditions. The moving gap 42 can disperse the radial force generated when the impeller 4 rotates, avoid stress concentration in the fitting part 531 or the end of the impeller 4, reduce the risk of fatigue cracks between the impeller 4 and the fitting part 531, and thus extend the service life of the water pump.

[0041] The implementation principle of a water pump buffer structure in this application embodiment is as follows: When the water pump is running, water enters the inner cavity of the pump casing 1 through the water inlet 13 and impacts the buffer surface 22. The inclination of the end face near the buffer gap 14 becomes steeper, the water flow is further decelerated and changes direction to enter the buffer gap 14. The remaining kinetic energy is absorbed by the buffer surface 22 and converted into heat energy or micro eddy energy dissipation, reducing turbulence and backflow losses, and preventing air and water in the pump casing 1 from being directly drawn into the inlet 11. At the same time, the guide surface 23 guides water from the buffer gap 14 to impact the guide surface 21. The guide surface 21 guides the water flow through the inner ring of the shielding sleeve 5 into the inlet 11. The buffer plate 2 is used to receive the water flow, so that the air and water are fully mixed and decelerated in the inner cavity of the pump casing 1. The local pressure increase effect of the buffer gap 14 can further compress the air bubbles, prevent air from entering the inlet 11, ensure that air does not easily occupy the flow channel space of the inlet 11, increase the actual amount of liquid transported, and ensure the flow rate and head of the water pump.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water pump buffer structure, characterized in that: The pump includes a pump casing (1) and a buffer plate (2). The surface of the pump casing (1) is provided with an inlet (11) and a water supply inlet (13) spaced apart. The water supply inlet (13) and the inlet (11) are both connected to the inner cavity of the pump casing (1). The buffer plate (2) is connected to the inner wall of the pump casing (1). One end of the buffer plate (2) is located between the inlet (11) and the water supply inlet (13). The other end of the buffer plate (2) is left with a buffer gap (14) between it and the inner wall of the pump casing (1) for water supply. Water enters the inner cavity of the pump casing (1) through the water supply inlet (13) and impacts the surface of the buffer plate (2). The surface of the buffer plate (2) guides the water to enter the inlet (11) from the buffer gap (14).

2. The water pump buffer structure according to claim 1, characterized in that: The buffer plate (2) has a buffer surface (22) on the surface facing the water inlet (13). The inclination height of the buffer surface (22) increases as the distance to the water inlet (13) decreases. The buffer surface (22) is used to receive water flow and guide water flow into the buffer gap (14).

3. The water pump buffer structure according to claim 1, characterized in that: The buffer plate (2) has a guide surface (21) on its surface facing the inlet (11). The inclination height of the guide surface (21) decreases as the distance to the inlet (11) decreases. The guide surface (21) is used to receive water flow and guide the water flow into the inlet (11).

4. The water pump buffer structure according to claim 3, characterized in that: The buffer plate (2) has a guide surface (23) at the end facing the buffer gap (14). The guide surface (23) is in the shape of a circular arc protrusion. The guide surface (23) is used to receive water flow and guide the water flow into the guide surface (21).

5. The water pump buffer structure according to claim 1, characterized in that: The end face of the buffer plate (2) connected to the inner wall of the pump casing (1) is provided with a reinforcing surface (24). The reinforcing surface (24) is arc-shaped, and the axis of the reinforcing surface (24) faces the inner cavity of the pump casing (1).

6. The water pump buffer structure according to claim 3, characterized in that: It also includes a motor (3), an impeller (4) and a shielding sleeve (5). The motor (3) is connected to the surface of the pump casing (1). The end of the motor (3) shaft is embedded in the inner cavity of the pump casing (1) and faces the inlet (11). The impeller (4) is coaxially connected to the shaft of the motor (3). The inner wall of the inlet (11) is coaxially provided with a shielding hole (12). The axis of the shielding hole (12) coincides with the axis of the motor (3). The outer ring of the shielding sleeve (5) is coaxially embedded in the inner wall of the shielding hole (12). The end face of the impeller (4) is coaxially provided with a sealing hole (41) for the end of the shielding sleeve (5) to be embedded. The outer peripheral surface of the shielding sleeve (5) abuts against the inner wall of the sealing hole (41) to form a limit.

7. The water pump buffer structure according to claim 6, characterized in that: The shielding sleeve (5) includes an adjusting ring (51), a moving ring (52), and a fixed ring (53). The end face of the adjusting ring (51) is coaxially fixed to the end face of the moving ring (52). The inner wall of the fixed ring (53) is coaxially provided with a moving cavity (534) for the outer ring of the moving ring (52) to be embedded. The inner diameter of the moving cavity (534) is larger than the outer diameter of the moving ring (52). The outer ring of the fixed ring (53) is coaxially embedded in the inner wall of the shielding hole (12). The end of the adjusting ring (51) is coaxially embedded in the sealing hole (41), and the outer wall of the adjusting ring (51) abuts against the inner wall of the sealing hole (41) to form a limit.

8. The water pump buffer structure according to claim 7, characterized in that: The shielding sleeve (5) also includes a plurality of elastic arc blocks (54), one end of the plurality of elastic arc blocks (54) in the arc direction is connected at intervals to the outer peripheral surface of the moving ring (52), and the inner wall of the moving cavity (534) is provided with a plurality of deformation cavities (535) for accommodating the elastic arc blocks (54), and the outer arc surface of the elastic arc block (54) abuts against the inner wall of the deformation cavity (535).

9. The water pump buffer structure according to claim 8, characterized in that: The fixing ring (53) includes a fitting part (531) and a pressing part (532). The outer ring of the fitting part (531) is coaxially embedded in the inner wall of the shielding hole (12). The end face of the fitting part (531) is coaxially provided with a pressing cavity (533) for the pressing part (532) to be inserted. The outer peripheral surface of the pressing part (532) presses against the inner wall of the pressing cavity (533) to form a fixation. The moving cavity (534) is located between the pressing part (532) and the fitting part (531). The deformation cavity (535) is located on the fitting part (531).

10. The water pump buffer structure according to claim 9, characterized in that: The inner ring of the fitting part (531) is for the end of the impeller (4) to be inserted, and a moving gap (42) is left between the outer circumferential surface of the impeller (4) and the inner ring wall of the fitting part (531) for the adjustment ring (51) to move.

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