Impeller of an oxygen-increasing machine and waterwheel type oxygen-increasing machine
By using an integrated impeller design and a blow-molded floating structure, the problems of troublesome impeller manufacturing and poor water exchange effect of waterwheel aerators are solved, achieving efficient water oxygenation and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG FORDY MACHINERY
- Filing Date
- 2025-03-31
- Publication Date
- 2026-06-09
AI Technical Summary
The impellers of existing waterwheel aerators are difficult to manufacture, have low production efficiency, and the horizontal floats affect the water exchange effect and have low power efficiency.
Design an integrally molded impeller with radially evenly distributed and axially parallel blades. The blades and impeller body are integrally injection molded. Combined with the stepped structure of the impeller body, the connection between the force transmission tenon and the slot is enhanced. The float adopts a closed structure and a blow-molded floating design to avoid material shortage problems.
It improves the impeller's production efficiency and propulsion effect, enhances water exchange capacity, reduces production costs, and extends the service life of the float.
Smart Images
Figure CN224330163U_ABST
Abstract
Description
Technical Field
[0001] This utility model pertains to aquaculture equipment, specifically referring to an impeller for a waterwheel-type aerator and an aerator equipped with the impeller. Background Technology
[0002] Typical waterwheel-type aerator impellers are equipped with perforated plate blades, resulting in poor aeration and low power efficiency. Chinese invention patent 200710137759.4 discloses a combined aerator consisting of a longitudinal float and a transverse float, which can reduce costs. However, in practical use, it was found that the transverse float slows down the water flow generated by the impeller rotation, affecting water exchange. Chinese invention patent 200710137759.4 also discloses a stacked impeller for a waterwheel-type aerator, composed of multiple stacked impeller bodies. Practical testing showed that aerators using this type of impeller have significantly improved power efficiency and energy savings compared to aerators with perforated plate blade impellers. However, the stacked impeller is cumbersome to manufacture and has low production efficiency, making it uneconomical given today's significantly increased labor costs. Summary of the Invention
[0003] The purpose of this invention is to provide a waterwheel-type aerator with an impeller that is integrally molded, has low production cost, and has good flow propulsion effect.
[0004] An impeller for a waterwheel-type aerator mainly includes an impeller body, blades, and a connecting disc. The impeller body has a connecting ring at its end, and a protruding force-transmitting tenon is provided on the connecting ring. The connecting disc has a force-transmitting groove that matches the force-transmitting tenon. After the connecting disc is connected to the connecting ring at the end of the impeller body, the force-transmitting tenon is fitted into the force-transmitting groove of the connecting disc. A connection position or connection hole for connecting to the flange of the waterwheel-type aerator's output shaft can be provided on the outside of the connecting disc; or a shaft-fitting hole can be provided inside the impeller body. The blades are mounted on the impeller body.
[0005] The blades are radially evenly distributed outside the impeller body, and the blades are axially parallel to the impeller body with gaps between them; or the blades are interconnected at the connecting end with the impeller body, and there are gaps between adjacent blades at the non-connecting end.
[0006] The impeller body is cylindrical, with blades radially evenly distributed on the cylindrical surface of the impeller body and axially parallel to each other on the cylindrical surface. There are gaps between adjacent blades to allow water to pass through when the impeller is working. Circular connecting rings are provided at both ends of the impeller body. The circular connecting rings are provided with force transmission tenons or force transmission grooves, or force transmission tenons and force transmission grooves. The force transmission tenons or force transmission grooves can be adapted to the force transmission tenons or force transmission grooves provided on the connecting plate.
[0007] The blades are angular with reinforcing strips on the back, and the ratio of the blade working surface width to the gap is 12:1 to 8:1.
[0008] The impeller body has at least one end with a larger diameter than the middle diameter, forming a stepped structure; the blades are axially arranged on the outer circumference of the stepped impeller body, and the blades at at least one end can be located at the step.
[0009] A waterwheel-type aerator mainly includes: a float, a power assembly, and an impeller. The float mainly consists of a main float, two auxiliary floats, and a support frame. One end of the main float is provided with a connecting plate for connecting the support frame, and the middle of the support frame is connected to the connecting plate of the main float. An auxiliary float is provided at each end of the support frame. The power assembly is installed on the main float, and the output shaft after deceleration drives the impeller to rotate and aerate. Alternatively, multiple floats are connected by the support frame and float on the water surface to form a float. The power assembly is installed on the float, and the output shaft after deceleration drives the transmission shaft. An impeller is installed on the transmission shaft. The power assembly includes a motor connected to a gearbox. The output shaft after deceleration by the gearbox drives the impeller. Alternatively, a low-speed permanent magnet motor does not require a gearbox, and the motor shaft directly drives the impeller.
[0010] The width-to-length ratio of the main floating vessel is 1:5 to 1:8. The connection between the main floating vessel and the support is set at the connecting plate extending in the length direction on the upper part of the main floating vessel. The connecting plate can be set as a support made of square or round tube. The main floating vessel and the connecting plate are blow molded together.
[0011] The auxiliary pontoon is blow-molded, with a device for connecting to a support embedded in the middle of its top. Each end of the support is connected to an auxiliary pontoon with a connecting device embedded in it, and the connecting device is fastened to the support with bolts. The connecting device on the top of the auxiliary pontoon includes a base plate, an insert, and a support seat. The support seat is located on the upper side of the base plate, and the insert is located on the lower side of the base plate. The auxiliary pontoon is blow-molded, and the injection-molded connecting device is pre-installed in the mold. After the hot plastic preform enters the cavity, compressed air is blown in to expand the plastic preform and form it to cover the insert. After cooling, the connecting device and the auxiliary pontoon become one piece.
[0012] A floating platform for a waterwheel-type aerator is disclosed. The upper panel of the floating platform is a closed hull-shaped structure. Mounting holes for connecting the main unit are set around the perimeter of the upper panel. The position of the mounting holes is equivalent to the deck of the hull. The deck needs to be more robust than the hull. For example, the upper panel of a commonly used floating platform is about 4mm thick, and the vertical plates and bottom plate are 3mm thick. The deck needs to be 5mm or more thick. During the blow molding process, local material shortage defects may occur at the junction of the upper panel, vertical plates and deck, which affects the service life of the floating body. This invention sets a groove on the upper surface where the upper panel and vertical plates connect, which can prevent material shortage at the junction of the upper panel and vertical plates and improve the service life of the floating platform.
[0013] The impeller includes an impeller body and blades. The impeller may have a single or multiple sets of structures, with each set having no fewer than three blades staggered on the impeller body. The impeller body and blades are integrally injection molded into an impeller. The impeller bodies can be connected to each other to form a larger impeller.
[0014] The impeller is integrally injection molded, resulting in high production efficiency. The parallel-arranged blades of the impeller act like multiple water splashers working simultaneously, propelling the water a long distance; the staggered blades enhance the diffusion of oxygen-enriched water. The floating structure, consisting of a main buoy, two auxiliary buoys, and a support frame, overcomes the technical problem of the transverse floating structure slowing the water flow caused by impeller rotation, thus affecting water exchange. Attached Figure Description
[0015] Figure 1 This is a three-dimensional schematic diagram of the impeller of this utility model; (the blades are arranged parallel to each other on the impeller body).
[0016] Figure 2 This is a utility model Figure 1 A three-dimensional schematic diagram of the impeller in another direction;
[0017] Figure 3 This is a three-dimensional schematic diagram of the impeller of this utility model; (the blades are misaligned on the impeller body).
[0018] Figure 4 This is a three-dimensional schematic diagram of an impeller with a shaft fitting hole inside the impeller body according to this utility model;
[0019] Figure 5 This is a schematic cross-sectional view of the impeller of this utility model;
[0020] Figure 6 This is a schematic diagram of the connecting plate and flange assembly of this utility model;
[0021] Figure 7 This is a three-dimensional structural diagram of the connecting disc of this utility model;
[0022] Figure 8 This is the utility model Figure 7 A schematic diagram of the three-dimensional structure from another direction;
[0023] Figure 9 This is a schematic diagram of the impeller interconnection and connection with the connecting plate of this utility model;
[0024] Figure 10 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is square).
[0025] Figure 11 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is square).
[0026] Figure 12This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is square).
[0027] Figure 13 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is square).
[0028] Figure 14 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is circular).
[0029] Figure 15 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is circular).
[0030] Figure 16 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is semi-circular).
[0031] Figure 17 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is square).
[0032] Figure 18 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (the installation position of the crossbeam is circular).
[0033] Figure 19 This is a three-dimensional schematic diagram of the auxiliary floating dock connecting seat of this utility model;
[0034] Figure 20 This is a three-dimensional schematic diagram of the auxiliary floating vessel connecting seat of this utility model; (it has two sets of holes for connecting with the crossbeam).
[0035] Figure 21 This is a three-dimensional schematic diagram of the auxiliary floating vessel of this utility model;
[0036] Figure 22 This is a three-dimensional schematic diagram of the auxiliary floating vessel of this utility model;
[0037] Figure 23 This is a three-dimensional schematic diagram of the upper cavity of the auxiliary floating vessel mold of this utility model;
[0038] Figure 24 This is a three-dimensional schematic diagram of the lower cavity of the auxiliary floating vessel mold of this utility model;
[0039] Figure 25 This is a three-dimensional schematic diagram of the main floating vessel of this utility model;
[0040] Figure 26 This is a three-dimensional schematic diagram of the main floating vessel of this utility model;
[0041] Figure 27 This is a three-dimensional schematic diagram of the main floating vessel of this utility model;
[0042] Figure 28 This is a three-dimensional schematic diagram of the main floating vessel of this utility model;
[0043] Figure 29 This is a three-dimensional schematic diagram of the groove set on the top of the floating vessel according to this utility model;
[0044] Figure 30 This is a schematic cross-sectional view of the floating vessel of this utility model;
[0045] Figure 31 This is a three-dimensional schematic diagram of the upper mold of this utility model;
[0046] Figure 32 This is a three-dimensional schematic diagram of the lower mold of this utility model;
[0047] Figure 33 This is a cross-sectional schematic diagram of the mold and floating vessel of this utility model;
[0048] Figure 34 This is a three-dimensional schematic diagram of the connection between the main floating vessel and the auxiliary floating vessel crossarm to form a floating body according to this utility model;
[0049] Figure 35 This is a three-dimensional schematic diagram of the connection between the main floating vessel and the auxiliary floating vessel crossarm to form a floating body according to this utility model;
[0050] Figure 36 This is a three-dimensional schematic diagram of the connection between the main floating vessel and the auxiliary floating vessel crossarm to form a floating body according to this utility model;
[0051] Figure 37 This is a three-dimensional schematic diagram of the aerator of this utility model;
[0052] Figure 38 This is a three-dimensional schematic diagram of the aerator of this utility model; (equipped with an impeller with existing plate-type blades).
[0053] Figure 39 This is a three-dimensional schematic diagram of the aerator of this utility model; (the blades are misaligned on the impeller body).
[0054] Figure 40 This is a three-dimensional schematic diagram of the oxygenator of this utility model.
[0055] In the diagram: Impeller body 1, Connecting ring 11, Force transmission tenon 13, Screw hole 131, Force transmission groove 14, Hole 141, Blade 2, Support rib 21, Shaft fitting hole 22, Spoke 23, Metal insert 24, Connecting disc 3, Small ring 31, Large ring 32, Support bar 33, Reinforcing rib 34, Connecting position 36, Connecting hole 37, Large hole 38, Screw 39, Flange 5, Connecting seat 6, Base plate 61, Support seat 62, Hole 63, Hole 64, Insert 65, Upper nut 66, Lower nut 67, Recess 68, Bolt 69, Drive shaft 7, Plate blade impeller 8, Blade Wheel 9, motor output shaft 81, motor 82, gearbox 83, output shaft 84, main float 85, auxiliary float 86, float 87, groove 88, mounting hole 89, permanent magnet synchronous motor 90, fixed seat 91, connecting hole 92, connecting position 93, groove 94, bracket 95, bearing seat 96, base 98, connecting hole 99, upper cavity 100, placement position 101, lower cavity 102, guide post 103, upper panel 104, vertical plate 105, fixed shaft 106, wire 107, deck 108, upper mold 109, punch 110, lower mold 111. Detailed Implementation
[0056] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 —40:
[0057] It should be noted that, where there is no conflict, the features of the embodiments of this application can be combined with each other. Unless otherwise expressly specified and limited, the terms "installation," "connection," "fixed connection," and "fixing" in this utility model description should be interpreted broadly, and can refer to fixed connections or detachable connections, direct connections or indirect connections.
[0058] An impeller for a waterwheel-type aerator mainly includes an impeller body 1, blades 2, and a connecting disc 3. Both ends of the impeller body 1 are provided with connecting rings 11, each with at least two protruding force-transmitting tenons 13. The connecting disc 3 has force-transmitting grooves 14 that mate with the tenons 13. After the connecting disc 3 is connected to the connecting rings 11 at the ends of the impeller body, the force-transmitting tenons 13 are fitted into the force-transmitting grooves 14 of the connecting disc. During operation, the force-transmitting tenons 13 and the force-transmitting grooves 14 transmit torque. The impeller body 1 and blades 2 can be injection molded into one piece, and the force-transmitting tenons 13 can also be integrally formed with the impeller body 1. The injection-molded force-transmitting tenons 13 can have a hollow structure to accommodate the injection molding process. The connecting disc 3 can also be injection molded. After the impeller body 1 and the connecting disc 3 are assembled, they can be fastened with screws 39 or pins. A connection position 36 and a connection hole 37 can be provided on the outer side of the connecting plate 3 to connect with the flange of the output shaft of the waterwheel aerator. The flange 5 is fastened with bolts and is installed on the output shaft 84 of the waterwheel aerator. During operation, the power assembly drives the impeller to rotate and aerate. Alternatively, a shaft fitting hole 22 is provided in the impeller body 1, and spokes 23 are provided around the shaft fitting hole 22 to connect the impeller body 1. The shaft fitting hole 22, spokes 23, blades 2, and impeller body 1 are integrally injection molded. A metal insert 24 can be provided in the shaft fitting hole 22 and fastened to the drive shaft 7 with screws.
[0059] The blades 2 are radially evenly distributed outside the impeller body 1, and are axially parallel to each other on the impeller body 1. There are gaps between the blades 2. The blades 2 are connected to the impeller body 1 at their connecting ends, meaning there are gaps between the blades at the non-connecting ends.
[0060] The impeller body 1 is cylindrical, and the blades 2 are radially evenly distributed on the cylindrical surface of the impeller body. The blades are axially parallel on the cylindrical surface, and there are gaps between adjacent blades to allow water to pass through when the impeller is working. Circular connecting rings are provided at both ends, and force transmission tenons 13 or force transmission grooves 14 are provided on the circular connecting rings. The connecting plate 3 is also circular, and the connecting plate 3 can be provided with force transmission tenons and force transmission grooves that are compatible with the force transmission tenons 13 or force transmission grooves 14 on the connecting rings.
[0061] The blades are angular with reinforcing strips on the back. The ratio of the working surface width (C) to the gap (D) is 12:1 to 8:1. The outer end of the blade has a rounded, gourd-shaped structure. Five to eight blades are evenly distributed radially on a cylindrical impeller body, preferably six blades per group. Each impeller has at least two groups of blades radially and axially aligned on the impeller body. Compared to staggered blade arrangement, this aligned blade arrangement improves the impeller's propulsion effect on the water, resulting in better performance for benthic aquaculture such as crabs.
[0062] The impeller body 1 has a stepped structure with larger diameters at both ends than at the middle. The blades are axially arranged on the outer circumference of the stepped impeller body. Water passage holes can be provided on the outer circumference of the impeller body, and the blades 2 at both ends can be located at the steps. The force transmission tenon 13 and force transmission groove 14 can be provided on the plane of the connecting ring.
[0063] The waterwheel-type aerator with the impeller described in this invention mainly includes: a float and a power assembly. The power assembly includes a motor vertically mounted on a gearbox. The float mainly consists of a main float 85, two auxiliary floats 86, and a support frame 95. One end of the main float 85 is provided with a connection position 93 for connecting the support frame. The middle part of the support frame 95 is connected to the connection position 93 of the main float 85, and an auxiliary float 86 is provided at each end of the support frame 95. The power assembly is mounted on the main float 85, and the output shaft after deceleration drives the impeller to rotate and aerate. Compared with the T-shaped combined float of prior art patent 200710137759.4, the aerator of this invention does not have a horizontal float to block water, and the water flow under the support frame during operation can improve the aeration effect.
[0064] The high-power aerator includes at least two floating pontoons 87 connected by brackets 95 to float on the water surface as a buoy. A powertrain or permanent magnet synchronous motor 90, bearing housing 96, and drive shaft 7 are mounted on the pontoons. The output shaft, after deceleration, drives the drive shaft, and an impeller is mounted on the drive shaft. The powertrain includes a motor connected to a gearbox, with the output shaft after deceleration driving the impeller. Alternatively, the low-speed permanent magnet synchronous motor 90 can directly drive the drive shaft and impeller to rotate together for aeration without a gearbox.
[0065] The impeller includes an impeller body 1 and blades 2. The impeller may have a single-set blade structure or a multi-set blade structure. The multi-set blade structure may be divided into two, three, or more sets of structures, with each set containing no fewer than two blades arranged in a staggered manner (see...). Figure 3 ) or neatly arranged on the impeller body (see Figure 1 Figure 2 The impeller body and blades are integrally injection molded into an impeller. The staggered arrangement of the blades in the impeller improves the diffusion capacity of oxygen-rich water during operation. The connecting rings at both ends of the neatly arranged impeller and the staggered impeller can be designed to be mutually compatible and combined as needed.
[0066] The waterwheel-type aerator float is a boat-shaped structure with a closed upper panel. The upper panel 104 of the float 87 needs mounting holes 89 around the perimeter to connect to the main engine (power assembly). The position of the mounting holes is equivalent to the deck 108 of the hull. The deck 108 needs to be more robust than the hull. For example, the upper panel 104 of a commonly used float is about 4mm thick, the vertical plate 105 and the bottom plate are 3mm thick, and the deck needs to be 5mm or more. During the blow molding process, the junction of the upper panel, vertical plate and deck may have local material shortage defects due to compressed air, which will affect the service life of the float. The present invention sets a groove 88 on the upper surface where the upper panel 104 and the vertical plate 105 of the float are connected, which can prevent material shortage at the junction of the upper panel 104 and the vertical plate 105 of the float and improve the service life of the boat-shaped float.
[0067] A blow molding method for a floating vessel with a waterwheel-type aerator includes a mold structure and a blow molding machine. The mold consists of an upper mold 109 and a lower mold 111. The upper mold 109 has a punch 110 inside its cavity to create a groove. The lower mold 111 is configured to form the shape below the deck 108, while the upper mold 109 has the shape above the deck 108 inside. The upper mold 109 fits over the lower mold 111. During operation, the upper and lower molds close towards each other to remove excess material around the blank, and then continue to close to extrude and shape the deck. Compressed air is blown in to inflate and shape the hull. It should be noted that the terms "upper mold 109" and "lower mold 111" in this invention do not refer to specific orientations.
[0068] A waterwheel-type aerator mainly includes a main float 85, a support frame 95, auxiliary floats 86, a power assembly, and an impeller. The main float 85 has a connection point 93 at one end connecting to the support frame, and the middle of the support frame 95 is connected to the connection point 93. An auxiliary float 86 is located at each end of the support frame. The power assembly is mounted on the main float 85, and an impeller is mounted on the output shaft of the power assembly. The power assembly includes a motor 82 connected to a reduction gearbox 83. The impeller is mounted on the output shaft of the reduction gearbox 83 after reduction. Alternatively, a permanent magnet synchronous motor 90 can directly drive the impeller without reduction, including a motor housing mounted on a fixed base 91 that does not rotate. The fixed base 91 is connected to the float, and the motor output shaft 81 drives the impeller to rotate. Alternatively, a motor fixed shaft 106 can be mounted on a fixed base 91 that does not rotate, and the fixed base 91 is connected to the float. The motor housing drives the impeller to rotate. The fixed shaft 106 is hollow, and an electrical wire 107 extends from inside the fixed shaft 106 after being sealed, connecting to the power source.
[0069] The width (W) to length (L) ratio of the main floating vessel 85 is 1:5 to 1:8. The connection between the main floating vessel 85 and the support 95 is set at the connection plate extending in the length direction on the upper part of the main floating vessel. The connection plate can be set as a support made of square or round tube.
[0070] The powertrain is mounted on the main floating vessel 85, on the side biased towards the connecting bracket 95, and is connected and fixed by a base 98 or a shim.
[0071] The auxiliary floating vessel 86 is blow-molded, and a device for connecting to a support is embedded in the center of its top. Each end of the support 95 can be connected to an auxiliary floating vessel 86 with an embedded connecting device, and the connecting device is fastened to the support 95 with bolts.
[0072] The connecting device on the top of the auxiliary pontoon includes an injection-molded connecting seat 6 comprising a base plate 61, an insert 65, and a support seat 62. The support seat 62 is disposed on the upper side of the base plate 61, and the insert 65 is disposed on the lower side of the base plate 61. The auxiliary pontoon with the connecting seat 6 is blow-molded. The blow-molding mold is divided into a left cavity and a right cavity. One of the left cavity and the right cavity is configured as the upper cavity 100 of the auxiliary pontoon, and the other cavity is configured as the lower cavity 102 of the auxiliary pontoon. The upper cavity 100 has a placement position 101 at its top, and the injection-molded connecting seat 6 is pre-installed in the placement position. After the hot plastic blank enters the cavity, compressed air is blown in to cause the plastic blank to expand and form a shape that encloses the insert 65. After cooling, it is combined with the auxiliary pontoon to form a whole.
[0073] The impeller includes an impeller body and blades. The impeller can have a single-group structure or multiple-group structures. A single-group structure consists of multiple blades arranged circumferentially on an impeller body. Multiple-group structures can have two, three, or more blade groups. In a multiple-group structure, multiple blade groups are arranged on a single impeller body, with the blade groups staggered on the same impeller body. The blade stagger angle can be selected as 8-12 degrees. For a three-group structure impeller, a stagger angle of 10 degrees is preferred, with six blades evenly distributed in each group. Two three-group structure impellers can be joined to form a single helical impeller with completely evenly distributed blades.
[0074] The impeller body and blades are integrally injection molded into an impeller. The impeller body is provided with a mutual locking mechanism, which can be matched with single-set impellers and two-set or multi-set impeller locking mechanisms, and can be combined to form impellers with more blades as needed.
[0075] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. An impeller for a waterwheel-type aerator, mainly comprising an impeller body, blades, and a connecting disc, characterized in that, The impeller body has a connecting ring at its end, and a protruding force-transmitting tenon on the connecting ring. The connecting plate has a force-transmitting groove that matches the force-transmitting tenon. After the connecting plate is connected to the connecting ring at the end of the impeller body, the force-transmitting tenon is fitted into the force-transmitting groove of the connecting plate. The outer side of the connecting plate may be provided with a connection position or connection hole for connecting to the flange of the waterwheel aerator output shaft; or the impeller body may be provided with a shaft fitting hole; the blades are disposed on the impeller body.
2. The impeller of the waterwheel-type aerator as described in claim 1, characterized in that, The blades are radially evenly distributed outside the impeller body, and the blades are axially parallel to the impeller body, with gaps between the blades; or the blades are interconnected at the connecting end with the impeller body, and there are gaps between adjacent blades at the non-connecting end.
3. The impeller of the waterwheel aerator as described in claim 1, characterized in that the impeller body is cylindrical, the blades are radially evenly distributed on the cylindrical surface of the cylindrical impeller body, the blades are axially parallel on the cylindrical surface, and there is a gap between adjacent blades to allow water to pass through when the impeller is working; a circular connecting ring is provided at both ends of the impeller body, and a force transmission tenon or force transmission groove is provided on the circular connecting ring, or both a force transmission tenon and a force transmission groove are provided simultaneously; the force transmission tenon or force transmission groove can be adapted to the force transmission tenon or force transmission groove on the connecting plate.
4. The impeller of the waterwheel-type aerator as described in claim 1, characterized in that, The blade is angular, with a reinforcing strip on the back of the blade, and the ratio of the width of the working surface of the blade to the gap is 12:1 to 8:
1.
5. The impeller of the waterwheel-type aerator as described in claim 1, characterized in that, The impeller body has a diameter at at least one end that is larger than the diameter at the middle, forming a stepped structure; the blades are axially arranged on the outer circle of the stepped impeller body, and the blades at at least one end can be located at the step.
6. The impeller of the waterwheel-type aerator as described in claim 1, characterized in that, The impeller includes an impeller body and blades. The impeller has a single or multiple structure, with each group having no fewer than three blades staggered on the impeller body. The impeller body and blades are integrally injection molded. The impeller bodies can be connected to each other to form a larger impeller.
7. A waterwheel-type aerator with the impeller of claim 1, mainly comprising a float, a power assembly, and an impeller, characterized in that, The floating body mainly consists of a main floating vessel, two auxiliary floating vessels, and a support frame. One end of the main floating vessel is equipped with a connecting plate that connects to the support frame. The middle of the support frame is connected to the connecting plate of the main floating vessel, and an auxiliary floating vessel is set at each end of the support frame. The power assembly is installed on the main floating vessel, and the output shaft after deceleration drives the impeller to rotate and oxygenate. Alternatively, multiple floating vessels can be connected by the support frame and float on the water surface. The power assembly is installed on the floating body, and the output shaft after deceleration drives the transmission shaft. The transmission shaft is equipped with an impeller. The power assembly includes a motor connected to a gearbox. The output shaft of the gearbox drives the impeller. Alternatively, a low-speed permanent magnet motor can be used without a gearbox, and the motor shaft directly drives the impeller.
8. The waterwheel-type aerator as described in claim 7, characterized in that, The width-to-length ratio of the main floating vessel is 1:5 to 1:
8. The connection between the main floating vessel and the support is through a connecting plate extending in the length direction from the upper part of the main floating vessel. The connecting plate can be adapted to a square tube or a round tube support. The main floating vessel and the connecting plate are integrally blow-molded.
9. The waterwheel-type aerator as described in claim 7, characterized in that, The auxiliary pontoon is blow-molded, with a device for connecting to a support embedded in the middle of the top of the auxiliary pontoon. Each end of the support is connected to an auxiliary pontoon with a connecting device embedded in it, and the connecting device is fastened to the support with bolts. The connecting device includes a base plate, an insert, and a support seat. The support seat is located on the upper side of the base plate, and the insert is located on the lower side of the base plate. The injection-molded connecting device is pre-installed in the mold. The hot plastic preform is blow-molded and encloses the insert. After cooling, the connecting device becomes an integral part of the auxiliary pontoon.