Double-end liquid inlet impeller for self-priming pump
By designing a self-priming pump impeller with double-ended liquid inlet, and adopting a hollow disc impeller and internal pump casing structure, the problem of poor self-priming performance of the self-priming pump is solved, the suction head and rotational stability are improved, and a highly efficient self-priming effect is achieved.
Patent Information
- Application Number
- CN202422663168.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-01
AI Technical Summary
Existing self-priming pumps have poor self-priming performance, large hydraulic losses, low efficiency, high noise, excessive vibration, small contact area between the blades and the liquid, poor gas-liquid mixing, resulting in slow water feeding speed.
Design a self-priming pump impeller with double-ended liquid inlet. The impeller is a hollow disc type with water inlets at both the top and bottom. An inner pump casing is added to the outside of the impeller. Double-ended water inlet is achieved through a one-to-two water inlet pipe. Combined with the diversion bracket and the inner pump casing, the impeller rotation is supported, which improves the water flow collection efficiency and rotational stability.
It significantly improves the suction head of the self-priming pump, reduces the net positive suction head (NPSH), enhances the rotational stability and efficiency of the impeller, and achieves a highly efficient self-priming effect with a suction head of up to 8 meters.
Smart Images
Figure CN223536614U_ABST
Abstract
Description
Technical Field
[0001] This article belongs to the technical field of self-priming pump impellers, specifically relating to an impeller for a self-priming pump with double-ended liquid inlet. Background Technology
[0002] A self-priming pump is a general-purpose water pump. Centrifugal pumps have an impeller and a volute inside. The impeller can rotate inside the volute, and the fluid is "drawn in" and discharged from the volute by the rotation of the impeller. The self-priming performance of a self-priming pump has two indicators: self-priming height and self-priming time. The higher the self-priming height or the shorter the self-priming time, the better the self-priming performance is considered.
[0003] However, the self-priming pumps currently in use all use a spiral volute as the discharge chamber, which results in large hydraulic losses and low efficiency. At the same time, when the pump's operating point deviates from the point of highest efficiency, the unbalanced radial force can easily cause the pump's vibration value to exceed the standard, increasing noise and affecting the pump's service life. The small contact area between the blades and the liquid results in poor agitation and gas-liquid mixing in the pump body during initial operation, leading to long gas discharge time and slow water filling speed. Utility Model Content
[0004] To address the aforementioned issues, this paper proposes a double-inlet self-priming pump impeller. The impeller has a fixed rotating shaft running through its center. The impeller is a hollow, disc-shaped impeller with arc-shaped blades arranged horizontally at its center. The impeller casing has an upper inlet and a lower inlet at its upper and lower ends, respectively. An outer outlet is located on the outer arc of the impeller casing. A connecting shaft is located at the bottom center of the arc-shaped blades. The outer edge of the arc-shaped blades is flush with the horizontal centerline of the outer outlet. The upper inlet is connected to the interior of the drainage support. The inlet is connected to the outside of the outer pump casing. The outer outlet is surrounded by an annular inner pump casing, which is fixed inside the outer pump casing. An impeller is axially rotatable inside the inner pump casing. The interior of the inner pump casing is connected to the interior of the outer pump casing through an opening. This improves upon the original single-sided water inlet design of the impeller by using inlets at both the top and bottom ends, and by adding an extra inner pump casing outside the impeller. This pressurizes and integrates the water flowing in from both ends, effectively achieving a low net positive suction head (NPSH) and greatly increasing the suction head to 8 meters under normal pressure.
[0005] The outer pump casing is cylindrical in shape. One side of the outer pump casing has an outlet pipe, and the other side of the outer pump casing has an inlet pipe that runs through the diameter of the drain. The bottom center of the outer pump casing has an inlet opening, and the outer side of the inlet opening is connected to the inlet pipe. The inner pump casing is fixedly located inside the inlet opening. By setting an inlet opening at the bottom of the outer pump casing and setting an inlet pipe on the outer side, the effect of water entering from both ends from the inside of the outer pump casing is achieved, and the water is finally led out from the outlet pipe, realizing the one-inlet and one-outlet effect of the self-priming pump.
[0006] The inner pump casing is a disc-shaped hollow shell. A flow guide bracket is fixedly inserted at the top of the inner pump casing. The bottom center of the inner pump casing is interconnected with the bottom center of the outer pump casing. A water outlet is provided on the outer side of the inner pump casing. The inner pump casing is interconnected with the interior of the outer pump casing through the water outlet. An impeller is axially rotatable inside the inner pump casing. The inner pump casing, located outside the impeller, not only concentrates the water output from the impeller, thereby effectively increasing the suction head, but also supports the rotation of the impeller, connecting it to the flow guide bracket to ensure the direct flow and stability of the water inlet, and also achieves efficient low-resistance rotation.
[0007] The diversion bracket is shaped like a conical horn. The bottom of the diversion bracket is fixedly connected to the top surface of the inner pump casing. The top outer side of the diversion bracket has a horizontally open water inlet pipe. The outer side of the diversion bracket is covered by an outer pump casing. The diversion bracket not only diverts water from the inlet pipe into the upper inlet of the impeller, but also assists the upper end of the impeller to rotate through the sealed bearing, thereby ensuring the stability of the impeller rotation. Furthermore, a rotating shaft is also installed through the center of the diversion bracket to allow the motor drive shaft to pass through.
[0008] The inlet pipe is a two-part round pipe. One end of the inlet pipe branch is connected to the inside of the diversion bracket, and the other end of the inlet pipe branch is connected to the water inlet opening of the outer pump casing. The two-part inlet pipe enables a single inlet pipe to directly supply water to both the upper and lower ends of the impeller at the same time.
[0009] The upper inlet of the impeller is axially connected to the inner side of the diversion bracket via a sealed bearing, and the lower inlet of the impeller is axially connected to the bottom of the inner pump casing. Both the upper and lower inlets have arc edges on their inner sides that smoothly transition to the outer outlet. The center of the arc-shaped blade has a connecting hole, and the outer edge of the central arc of the arc-shaped blade has a gradually narrowing diversion arc surface. The bottom of the arc-shaped blade is connected to the rotating shaft via a connecting central shaft. Through the inlets at the upper and lower ends of the impeller, efficient water flow is achieved, which greatly improves the effect of steam turbidity and increases the suction head. By placing the arc-shaped blade in the middle of the outlet, the gap between the upper and lower inlets and outlets is the same, thus ensuring that the water flow at both the upper and lower inlets is the same and ensuring the overall rotational stability of the impeller.
[0010] Beneficial effects:
[0011] The original single-sided water inlet design of the impeller has been improved by using inlets at both the top and bottom. An additional inner pump casing is also installed on the outside of the impeller to pressurize and integrate the water flowing in from both ends. This effectively achieves a small net positive suction head (NPSH) and greatly increases the suction head, which can reach 8 meters under normal pressure.
[0012] By setting an inlet opening at the bottom of the outer pump casing and an inlet pipe on the outside, water can be drawn in from both ends from inside the outer pump casing and finally led out from the outlet pipe, achieving the effect of one inlet and one outlet for the self-priming pump.
[0013] The inner pump casing, located on the outside of the impeller, not only concentrates the water output from the impeller, thereby effectively increasing the suction lift, but also supports the rotation of the impeller, connecting it to the diversion bracket to ensure the straightness and stability of the water inlet, and also enables efficient, low-resistance rotation.
[0014] The diversion bracket not only diverts water from the inlet pipe into the upper inlet of the impeller, but also assists the upper end of the impeller to rotate through the sealed bearing, thus ensuring the stability of the impeller rotation. Furthermore, a rotating shaft is installed through the center of the diversion bracket to allow the motor drive shaft to pass through.
[0015] The two-inlet design allows a single inlet pipe to simultaneously supply water to both the upper and lower ends of the impeller.
[0016] The impeller has inlets at both the top and bottom ends, which enables efficient water flow collection, greatly reducing the impact of steam turbidity and increasing the suction head. The curved blades are placed in the middle of the outlet, so that the gaps between the inlets and outlets at both ends are the same, thus ensuring that the water flow at both the top and bottom inlets is the same and ensuring the overall rotational stability of the impeller. Attached Figure Description
[0017] Figure 1 This is an assembly cross-sectional view of an impeller for a self-priming pump with double-ended liquid inlet;
[0018] Figure 2 This is a cross-sectional view of an impeller for a self-priming pump with double-ended liquid inlet;
[0019] In the diagram: 1. Outer pump casing, 2. Inner pump casing, 3. Impeller, 31. Connecting shaft, 32. Arc-shaped blade, 33. Upper inlet, 34. Lower inlet, 35. Outer outlet, 4. Drainage bracket, 5. Rotating shaft. Detailed Implementation
[0020] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.
[0021] 1. Outer pump casing, 2. Inner pump casing, 3. Impeller, 31. Connecting shaft, 32. Arc-shaped blade, 33. Upper inlet, 34. Lower inlet, 35. Outer outlet, 4. Drainage bracket, 5. Rotating shaft.
[0022] like Figure 1 , 2 As shown;
[0023] An impeller 3 for a self-priming pump with double-ended inlet is provided. A rotating shaft 5 is fixedly mounted through the center of the impeller 3. The impeller 3 is a hollow, disc-shaped impeller. An arc-shaped blade 32 is laterally positioned at the center of the impeller 3. An upper inlet 33 and a lower inlet 34 are respectively located at the upper and lower ends of the impeller 3's outer casing. An outer outlet 35 is located on the outer arc-shaped outer side of the impeller 3's outer casing. A connecting shaft 31 is located at the bottom center of the arc-shaped blade 32. The outer edge of the arc-shaped blade 32 is flush with the horizontal centerline of the outer outlet 35. The upper inlet 33 is internally connected to a flow guide bracket 4. The lower inlet 34... The outer pump housing 1 is connected to the outside of the outer outlet 35. An inner pump housing 2 is annularly enclosed on the outside of the outer outlet 35. The inner pump housing 2 is fixedly located inside the outer pump housing 1. An impeller 3 is axially rotatable inside the inner pump housing 2. The interior of the inner pump housing 2 communicates with the interior of the outer pump housing 1 through an opening. The outer pump housing 1 is cylindrical in shape. One side of the outer pump housing 1 has an outlet pipe, and the other side has an inlet pipe that penetrates through the drainage diameter. An inlet opening is located at the center of the bottom surface of the outer pump housing 1. The outside of the inlet opening communicates with the inlet pipe, and the inner pump housing 2 is fixedly located inside the inlet opening. The inner pump housing 2 has a shape... The inner pump housing 2 has a disc-shaped hollow casing. A flow guide 4 is fixedly connected to the top of the inner pump housing 2. The bottom center of the inner pump housing 2 is connected to the bottom center of the outer pump housing 1. A water outlet is located on the outer side of the inner pump housing 2, which is connected to the interior of the outer pump housing 1. An impeller 3 is axially rotatable inside the inner pump housing 2. The flow guide 4 is conical and funnel-shaped. Its bottom is fixedly connected to the top surface of the inner pump housing 2. A water inlet pipe is laterally connected to the outer side of the top of the flow guide 4. The outer pump housing 1 is enclosed on the outer side of the flow guide 4. The water inlet pipe is a two-part cylindrical pipe. One branch of the water inlet pipe... The end of the impeller 3 is connected to the inside of the diversion bracket 4, and the other end of the inlet pipe branch is connected to the inlet opening of the outer pump casing 1. The upper inlet 33 of the upper end of the impeller 3 is axially connected to the inner side of the diversion bracket 4 through a sealed bearing. The lower inlet 34 of the lower end of the impeller 3 is axially connected to the bottom of the inner pump casing 2. The inner sides of the upper inlet 33 and the lower inlet 34 are provided with arc edges that smoothly transition to the outer outlet 35. The center of the arc blade 32 is provided with a plug-in rotating hole. The outer edge of the central arc of the arc blade 32 is provided with a diversion arc surface that gradually narrows. The bottom of the arc blade 32 is connected to the rotating shaft 5 through the connecting central shaft 31.
[0024] Implementation example;
[0025] In use, the impeller 3 is driven to rotate by the rotating shaft 5. The upper water inlet 33 and the lower water inlet 34 at both ends of the impeller 3 are used to draw water through the water inlet pipe. After the liquid enters the impeller 3, it is discharged from the outer water outlet 35 on both sides by rotation and enters the inner pump shell 2. It is then discharged through the inner pump shell 2 by further pressurization, and then enters the outer pump shell 1. Finally, it is discharged directly from the water outlet pipe of the outer pump shell 1.
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An impeller for a self-priming pump with double-ended liquid inlet, wherein a rotating shaft is fixedly disposed through the center of the impeller, characterized in that, The impeller is a hollow disc-shaped impeller with an arc-shaped blade horizontally positioned at its center. The impeller's outer shell has an upper inlet and a lower inlet at its top and bottom ends, respectively. An outer outlet is located on the outer arc of the impeller's outer shell. A connecting shaft is located at the bottom center of the arc-shaped blade. The outer edge of the arc-shaped blade is flush with the horizontal centerline of the outer outlet. The upper inlet is connected to the interior of the flow guide bracket, and the lower inlet is connected to the exterior of the outer pump casing. An inner pump casing is annularly enclosed on the outer side of the outer outlet. The inner pump casing is fixedly located inside the outer pump casing, and the impeller is axially rotatable inside the inner pump casing. The interior of the inner pump casing communicates with the interior of the outer pump casing through an opening.
2. The impeller for a self-priming pump with double-ended liquid inlet according to claim 1, characterized in that, The outer pump housing is cylindrical in shape. One side of the outer pump housing is provided with an outlet pipe, and the other side of the outer pump housing is provided with an inlet pipe that runs through the diameter of the drainage pipe. The bottom center of the outer pump housing is provided with an inlet opening. The outer side of the inlet opening is connected to the inlet pipe, and the inner pump housing is fixedly provided on the inner side of the inlet opening.
3. The impeller for a self-priming pump with double-ended liquid inlet according to claim 1, characterized in that, The inner pump housing is a disc-shaped hollow shell. The top of the inner pump housing is fixedly connected to a flow guide bracket. The bottom center of the inner pump housing is connected to the bottom center of the outer pump housing. The outer side of the inner pump housing is provided with a water outlet. The inner pump housing is connected to the interior of the outer pump housing through the water outlet. The interior of the inner pump housing is provided with an impeller that rotates axially.
4. The impeller for a self-priming pump with double-ended liquid inlet according to claim 1, characterized in that, The drainage bracket is shaped like a conical horn. The bottom of the drainage bracket is fixedly connected to the top surface of the inner pump housing. The top outer side of the drainage bracket is provided with a horizontally conductive water inlet pipe. The outer side of the drainage bracket is provided with an outer pump housing.
5. The impeller for a self-priming pump with double-ended liquid inlet according to claim 2, characterized in that, The water inlet pipe is a two-part round pipe. One end of the water inlet pipe branch is connected to the interior of the drainage bracket, and the other end of the water inlet pipe branch is connected to the water inlet opening of the outer pump casing.
6. The impeller for a self-priming pump with double-ended liquid inlet according to claim 1, characterized in that, The upper inlet of the impeller is axially connected to the inner side of the diversion bracket via a sealed bearing, and the lower inlet of the impeller is axially connected to the bottom of the inner pump casing. Both the upper and lower inlets have arc edges on their inner sides that smoothly transition to the outer outlet.
7. The impeller for a self-priming pump with double-ended liquid inlet according to claim 1, characterized in that, The arc-shaped blade has a central insertion hole, and the outer edge of the central arc of the arc-shaped blade is provided with a gradually narrowing flow-guiding arc surface. The bottom of the arc-shaped blade is connected to the rotating shaft via a connecting central shaft.