Impeller of impeller type aerator
By designing an open impeller with a frustum-shaped hub and quadrilateral blades, the problem of debris entanglement on the blades was solved, improving oxygenation efficiency and reducing mechanical energy consumption.
Patent Information
- Application Number
- CN202422274844.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The blades of existing impeller aerators are prone to getting entangled in aquatic plants and other debris, increasing resistance and resulting in mechanical power loss and insufficient oxygenation efficiency.
Design an open impeller with a frustum-shaped hub and quadrilateral blades. Obtuse angles are set on the bottom surface of the hub and the blades are bent along the axial direction of the hub. The number of blades is 8, and through holes and reinforcing ribs are provided near the central shaft of the impeller. It is manufactured by one-piece injection molding.
It reduces the possibility of debris getting tangled in the blades, improves the mixing effect, enhances the oxygenation capacity, and reduces mechanical power consumption.
Smart Images
Figure CN223528730U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aquaculture, and in particular to an aerator used in aquaculture, wherein the impeller-type fan blades are used. Background Technology
[0002] To maintain sufficient dissolved oxygen in aquaculture water, promote the proliferation of aerobic microorganisms, reduce organic matter such as ammonia nitrogen, improve water quality, and facilitate intensive and high-yield aquaculture, aerators are used to increase dissolved oxygen in the aquaculture water.
[0003] The principle of oxygenation is based on the molecular diffusion of gases through the gas-liquid double membrane during the gas-liquid transfer process, followed by convective diffusion outside the membrane. Aerators increase the relative speed of the gas and liquid phases by agitating the gas-liquid interface, accelerating oxygen diffusion and transfer, thus increasing the dissolved oxygen content in the aquaculture water. The main types include impeller, paddlewheel, spray, jet, paddle, and air-filled types. In addition, there are pipe, suction, and gravity types, among others, selected according to the aquaculture species and water conditions.
[0004] The impeller in a paddlewheel-type impeller functions to draw up oxygen-deficient water from its lower part and then push it outwards, turning stagnant water into flowing water. The water below the impeller is intensely agitated by the blades and tubes, creating water jumps and waves on the surface, forming a water curtain that can trap air. Because the impeller creates negative pressure at the rear of the agitation tube during rotation, air can be drawn into the water through the agitation tube and immediately agitated into microbubbles that enter the impeller's pressure zone. This also helps to increase the dissolution rate of oxygen in the air, improving oxygenation efficiency. Impellers can be broadly classified into three types: closed, semi-open, and open. Closed impellers have front and rear covers; semi-open impellers have only one of the front or rear covers; and open impellers have no front cover, only a partial rear cover, or no rear cover at all.
[0005] The most common impellers in commercially available aerators are semi-open or open impellers with only a rear cover. They have a number of blades, and the most common blade shapes are rectangular planes or cylinders, or variations based on single-curved or double-curved blades, as well as adjustments to the form and shape of the joints. The blade shapes often result in sharp corners at the bottom, and sometimes even concave areas, making the blades prone to entanglement with debris, aquatic plants, and other imperfections. This increases drag and causes the mechanical power to be primarily lost to water resistance, resulting in insufficient oxygenation. Utility Model Content
[0006] This utility model discloses an impeller-type aerator impeller to solve the problems caused by the aforementioned shape. The solution is as follows:
[0007] An impeller for an aerator is characterized by being an open impeller with a hub in the shape of a frustum. Blades are obliquely arranged on the hub and evenly distributed. The unfolded shape of the blades is a quadrilateral with three acute angles greater than 60°. The obtuse angle of the blades is located on the upper bottom surface of the hub. The blades are bent in the same direction along the radial direction of the hub, about the axis of the hub's axial direction.
[0008] Specifically, the impeller hub of the impeller-type aerator has a base angle of 50°-60° in its axial section. The impeller blades are bent at 120° radially along the hub. There are eight blades, which are obliquely positioned on the hub at an angle of 40-60° to the lower surface of the hub.
[0009] Specifically, a through hole is provided near the central shaft of the impeller, and a reinforcing rib is provided on the through hole. The through hole is located on the lower bottom surface of the impeller.
[0010] Furthermore, the impeller is manufactured using a one-piece injection molding method.
[0011] The impeller blades are not complex in shape design. The design of the frustum hub and the blade shape facilitates one-piece injection molding. The obtuse angle design of the impeller's bottom surface avoids or reduces the possibility of debris entanglement. The appropriate curvature of the impeller blades causes the impeller to rotate, producing a ladle-like scooping motion, enhancing the stirring effect. Attached Figure Description
[0012] Figure 1 The image shown is a front view of the impeller.
[0013] Figure 2 The diagram shown is a schematic of one side of the bottom surface of the impeller.
[0014] Figure 3 The image shown is a cross-sectional view of the impeller.
[0015] Figure 4 The image shown is a diagram of the blade's unfolded shape.
[0016] Among them, 1 is the blade, 2 is the hub, 3 is the through hole, and 31 is the reinforcing rib. Detailed Implementation
[0017] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.
[0018] like Figure 1-3As shown, the impeller of the impeller-type aerator is an open impeller, the hub 2 is frustum-shaped, and there are 8 blades 1 evenly distributed. The blades 1 are obliquely positioned on the hub 2 at a 50° angle to the lower surface of the hub 2. The unfolded shape of the blades 1 is a quadrilateral with three acute angles greater than 60°. The obtuse angles of the blades 1 are located on the upper surface of the hub 2. The blades 1 rotate about the axial direction of the hub 2. Figure 4 The dotted line in the diagram bends in the same direction along the radial direction of hub 2, specifically by 120°. Technicians set the impeller rotation direction to match this, so that the obtuse angle of blade 1 faces the water, thus making the bent blade 1 act like scooping water. If the rotation direction is reversed, the aerator's function of stirring and oxygenating the water will be greatly reduced, making it impossible to achieve the desired effect.
[0019] Hub 2 is a frustum of a circle with a base angle of 50°-60° on its axial section, similar in shape to a bowl.
[0020] refer to Figure 2 , 3 A through hole 3 is provided near the central shaft of the impeller, and a reinforcing rib 31 is provided on the through hole 3. The through hole 3 is located on the bottom surface of the impeller.
[0021] refer to Figure 3 The impeller is manufactured using a one-piece injection molding method. It can be imagined that the sliders used for manufacturing between each blade 1 are roughly in the shape of a ramp. Combined with the inclination angle between the blade 1 and the bottom surface of the hub 2, the sliders are easy to remove.
Claims
1. An impeller for a paddlewheel aerator, characterized in that, It is an open impeller with 3 or more blades. The hub is truncated cone-shaped. The blades are obliquely arranged on the hub and evenly distributed. The blades are unfolded into quadrilaterals with three acute angles greater than 60°. The obtuse angles of the blades are located on the upper bottom surface of the hub. The blades are bent in the same direction along the radial direction of the hub, about the axis of the hub's axial direction.
2. The impeller of the impeller-type aerator as described in claim 1, characterized in that, The bottom angle of the axial section of the hub is 50°-60°.
3. The impeller of the impeller-type aerator as described in claim 1, characterized in that, The blade is bent 120° in the radial direction of the hub.
4. The impeller of the impeller-type aerator as described in claim 1, characterized in that, A through hole is provided near the central shaft of the impeller, and a reinforcing rib is provided on the through hole.
5. The impeller of the impeller-type aerator as described in claim 4, characterized in that, The through hole is located on the bottom surface of the impeller.
6. The impeller of the impeller-type aerator as described in claim 1, characterized in that, The impeller is manufactured by injection molding in one piece.
7. The impeller of the impeller-type aerator as described in claim 1, characterized in that, The number of blades is 8.
8. The impeller of the impeller-type aerator as described in claim 1, characterized in that, The blade is obliquely mounted on the hub at an angle of 40-60° to the lower bottom surface of the hub.