Energy-saving anti-cavitation water pump

Abstract

The application provides a novel energy-saving anti-cavitation water pump, which is provided with an axial forward-sweeping composite inducer at the inlet of the water pump. The axial forward-sweeping composite inducer is divided into two sides, i.e. an inner side and an outer side. The outer side of the axial forward-sweeping composite inducer is an outer convex inducer base. The inducer base is provided with uniformly distributed inducer outer suction blades, which are used to induce liquid to quickly enter the central area of an impeller, pressurize the central part, and install inducer head compensation blades in the inner side of the axial forward-sweeping composite inducer. The application can improve the turbulence and unevenness of the flow field in the pump, reduce the damage of cavitation to the blades caused by the sharp change of the pressure in the pump, improve the continuity of the fluid, process the foreign matters carried in the transmission medium, and further improve the service life and reliability of the water pump. Moreover, the water pump has the advantages of small structure size, convenient layout, easy production, low processing and manufacturing cost, and the like.

Description

Technical Field

[0001] This invention pertains to the cooling system of automotive power batteries and relates to an energy-saving and cavitation-resistant water pump. Background Technology

[0002] The water pump is a crucial component of an automotive cooling system, and its performance determines the vehicle's operating condition, directly impacting the power unit's power performance, fuel economy, and lifespan. The flow field during water pump operation is highly complex, generating numerous eddies, secondary flows, and bubbles as the impeller rotates at high speed. Due to the harsh working environment and the presence of these eddies and bubbles, cavitation and pressure surges can occur within the pump. This can easily damage the pump, and in severe cases, cause flow channel blockage, affecting the continuity of water flow and ultimately reducing pump efficiency and reliability. Therefore, it is necessary to design an energy-efficient, cavitation-resistant automotive water pump. Summary of the Invention

[0003] 1. The technical problem to be solved:

[0004] This improves the efficiency and reliability of water pumps by mitigating the effects of numerous eddies, bubbles, and secondary flows within the pump's flow domain under complex operating conditions, thus reducing waterway blockage.

[0005] 2. Technical Solution:

[0006] To address the above problems, this invention provides an energy-saving and cavitation-resistant water pump, including an impeller mounted on an impeller base. An axially swept-forward composite inducer is located at the pump inlet, comprising inner and outer sides. The outer side of the axially swept-forward composite inducer features a convex inducer base with uniformly arranged external suction blades to induce liquid to rapidly enter the impeller's central region and pressurize the central area. The inner side of the axially swept-forward composite inducer is equipped with inducer head compensation blades.

[0007] The inner shape of the axially swept composite inducer is an umbrella shape that is concave in the opposite direction of the medium movement, and inducer head compensation blades are uniformly installed on the inner wall surface.

[0008] The height of the external suction blades and the head compensation blades of the inducer wheel is 10-20mm.

[0009] The tilt angle of the inducer head compensation blades is 20° to 45°.

[0010] The impeller includes multiple sets of blades, which are evenly distributed on the impeller base. Each set of blades includes large blades and small blades. The small blades are installed near the root 1 / 3 of the back of the large blades and end at the midline between two adjacent large blades.

[0011] The impeller comprises 6 sets of blades.

[0012] The small leaflets have a twisted band structure, with the bending direction opposite to the rotation direction, and the large leaflets have a shape that is thin at the root and thick at the tail.

[0013] The twist angle of the leaflets is 45-90°.

[0014] The impeller has a pair of magnets with opposite magnetic properties on its back side and the rear cover plate. Multiple magnet mounting slots are installed on the back side of the impeller to install positive magnetic strips, and a negative magnetic ring is installed in the rear housing cavity.

[0015] The widths at both ends of the magnet mounting slot are not consistent; the width closer to the central axis is larger, and the width further away from the central axis is smaller.

[0016] 3. Beneficial effects:

[0017] This invention improves the turbine and non-uniformity of the flow field within the pump, reduces cavitation damage to the blades caused by rapid pressure changes, enhances fluid continuity, and handles foreign matter carried in the transport medium, further improving the pump's service life and reliability. Furthermore, this pump boasts advantages such as small size, convenient layout, ease of production, and low manufacturing cost, making it suitable for complex operating environments, with a wide range of applications and excellent performance. Attached Figure Description

[0018] Figure 1 This is a side view of the impeller shaft according to an embodiment of the present invention.

[0019] Figure 2 These are top and front views of the impeller according to an embodiment of the present invention.

[0020] Figure 3 This is a diagram of the thrust magnet at the bottom of the impeller according to an embodiment of the present invention.

[0021] Figure 4 These are front and cross-sectional views of the inducer wheel according to an embodiment of the present invention.

[0022] In the diagram: 1. Impeller; 2. Large blade; 3. Impeller base; 4. Small blade; 5. Magnet mounting slot; 6. Thrust magnet assembly; 8. Inducer base; 9. Inducer external suction blade; 10. Inducer head compensation blade. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 4 As shown, the present invention provides an energy-saving and cavitation-resistant water pump, including an impeller 1, which is mounted on an impeller base 3. An axially swept-forward composite inducer is provided at the inlet of the water pump. The axially swept-forward composite inducer is divided into inner and outer sides. On the outer side of the axially swept-forward composite inducer is a convex inducer base 8. The inducer base 8 has uniformly arranged inducer suction blades 9, which are used to induce liquid to quickly enter the central area of ​​the impeller 1 and pressurize the central part. An inducer head compensation blade 10 is installed inside the axially swept-forward composite inducer.

[0025] The inducer base 8 adopts a forward-swept structure. Before the liquid enters the chamber from the inlet, it passes through the inducer. Here, the head generated by the inducer is used to pressurize the low-pressure area sucked in by the water pump. When the liquid passes through the inducer, it is accelerated by the suction blades 9 outside the inducer, allowing it to pass through the inducer quickly.

[0026] The axially swept-forward composite inducer works by addressing the issue of low pressure in the pump's central region after the fluid enters and undergoes high-speed motion. The pressure gradually increases radially. When air bubbles move from the low-pressure to the high-pressure region, the surrounding high-pressure liquid causes them to rapidly shrink and collapse, creating a local vacuum. The pump blades then impact this vacuum at high speed, generating significant impact force that severely damages the blades. Due to the cumulative effect of time and impacts, cavitation easily occurs at the blade tip, potentially leading to blade penetration. Therefore, the axially swept-forward composite inducer effectively reduces the number of air bubbles, minimizes cavitation damage to the pump blades, and prevents blockage of the bubble channels from affecting fluid continuity.

[0027] In one embodiment, the inner shape of the axially swept composite inducer is an umbrella shape with a reverse indentation along the direction of medium movement, and inducer head compensation blades 10 are uniformly installed on the inner wall. After passing through the inducer, because a set of inducer head compensation blades 10 at the rear of the inducer compensates for the head of the fluid, energy utilization is further improved, resulting in a better pressurization effect. Furthermore, because of the inducer head compensation blades 10 on the inner side of the axially swept composite inducer, the pump head can be increased, eliminating energy loss caused by the inducer.

[0028] like Figure 1 and Figure 2 As shown, the impeller 1 of the water pump features an integrated blade design, with a total of 6 sets evenly distributed circumferentially. Each set of impeller 1 consists of one large blade 2 and one small blade 4. When liquid enters the chamber from the pump inlet, it is temporarily stored within it. The large blade 2 is a tapered blade with a front-to-back ratio of 0.5, utilizing the mass of its portion away from the axis to increase the inertia of the impeller 1, and its thickness provides better stability. A small blade 4 with a twist angle of 45° is mounted on the back of the large blade 2, its bending direction opposite to the rotation direction. During pump operation, an axial vortex region is generated between the two large blades 2, but the ribbon-shaped small blade 4 can mitigate this turbulence through its unique structure. After the fluid passes through the small blade 4, the original axial vortex is forced into the axial vortex region by an external force, reducing the velocity gradient and improving the uniformity of the internal flow field of the pump. This results in improved pump output performance and reduced energy consumption. The large blade 2 has a thin root and thick tail shape, which is beneficial for liquid flow and can improve the strength of the pump impeller 1, resulting in a longer service life. The small blade 4 is installed near the root 1 / 3 of the back of the large blade 2 and ends at the midline between the two blades. The small blade 4 has a twisted band structure, with the bending direction opposite to the rotation direction. Both the large and small impellers 1 have an equal number of 6 blades. Due to the special structure of the small impeller 1, it can interfere with the turbine and secondary flow existing between the two large blades 2, improve the flow field inside the pump, and reduce the impact of turbine and secondary flow factors on the pump's working efficiency.

[0029] like Figure 3 As shown, the impeller 1 has a pair of magnets with opposite magnetic properties on its back side and the rear cover plate. Multiple magnet mounting slots 5 are installed on the back side of the impeller 1 to install positive magnetic strips, and a negative magnetic ring is installed in the rear shell cavity.

[0030] The thrust magnet assembly 6 at the bottom of impeller 1 addresses the issue of axial eddy currents generated during pump operation, which can push the central shaft backward, affecting pump efficiency and stability. Adding this assembly to the bottom of impeller 1 and the rear housing cavity utilizes the inertia of impeller 1 to self-lock the magnet mounting slot 5, preventing axial movement of the impeller 1 due to axial eddy currents or other reasons, thus avoiding wear on the impeller 1 and rear cover plate. This structure also adsorbs impurities carried in the liquid, extending pump lifespan. It's noteworthy that the rear housing cavity contains a single, continuous magnet, while the rear of impeller 1 contains a set of magnets with non-uniform width, narrowing the width further from the central axis (approximately 0.6).

[0031] A set of repulsive magnets is installed on the back of the impeller 1 and inside the rear housing of the water pump. Four non-uniformly wide magnet mounting slots 5 are installed on the back of the impeller 1 for mounting magnetic strips. The centrifugal force of the rotating impeller 1 ensures that the magnetic strips are tightly attached to the inner wall of the mounting slots, preventing loosening that could affect the pump's continuous operation and abnormal vibration. Multiple sets of repulsive magnets are installed on the pump's rear cover and impeller 1 to counteract axial thrust, preventing wear on the impeller 1 and rear cover. Simultaneously, the magnets can attract foreign objects carried in the fluid, further improving service life and pump reliability.

[0032] In one embodiment, the widths at both ends of the magnet mounting groove 5 are not consistent; the width closer to the central axis is larger, and the width further away from the central axis is smaller.

Claims

1. An energy-saving and cavitation-resistant water pump, comprising an impeller (1), wherein the impeller (1) is mounted on an impeller base (3), characterized in that: An axially swept composite inducer is provided at the inlet of the water pump. The axially swept composite inducer is divided into inner and outer sides. The outer side of the axially swept composite inducer is a convex inducer base (8). The inducer base (8) has uniformly arranged inducer suction blades (9) to induce the liquid to enter the central area of ​​the impeller (1) quickly and pressurize the central part. The inner side of the axially swept composite inducer is equipped with inducer head compensation blades (10). The inner side of the axially swept composite inducer is a canopy shape that is concave in the opposite direction of the medium movement. The inducer head compensation blades (10) are uniformly installed on the inner wall.

2. The energy-saving and cavitation-resistant water pump as described in claim 1, characterized in that: The height of the external suction blade (9) of the inducer wheel and the head compensation blade (10) of the inducer wheel is 10-20mm.

3. The energy-saving and cavitation-resistant water pump as described in claim 2, characterized in that: The tilt angle of the inducer head compensation blade (10) is 20° to 45°.

4. The energy-saving and cavitation-resistant water pump as described in any one of claims 1-3, characterized in that: The impeller (1) includes multiple sets of blades, which are evenly distributed on the impeller base (3). Each set of blades includes a large blade (2) and a small blade (4). The small blade (4) is installed near the root 1 / 3 of the back of the large blade (2) and ends at the middle axis of the two adjacent large blades (2). The back of the impeller (1) and the rear cover plate have a pair of magnets with opposite magnetic properties. Multiple magnet mounting slots (5) are installed on the back of the impeller (1) for installing positive magnetic strips. A negative magnetic ring is installed in the rear shell cavity. The widths of the magnet mounting slots (5) are not consistent at both ends, with the width closer to the central axis being larger and the width further away from the central axis being smaller.

5. The energy-saving and cavitation-resistant water pump as described in claim 4, characterized in that: The impeller (1) includes 6 sets of blades.

6. The energy-saving and cavitation-resistant water pump as described in claim 4, characterized in that: The small leaflet (4) has a twisted structure with the bending direction opposite to the rotation direction, and the large leaflet (2) has a leaf shape that is thin at the root and thick at the tail.

7. The energy-saving and cavitation-resistant water pump as described in claim 6, characterized in that: The twist angle of the leaflet (4) is 45-90°.

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