A low-power submersible flow thruster

Abstract

The present invention is a low-power submersible flow pusher, comprising an impeller, a reducer, a motor, and a bracket. The impeller comprises a hub and blades mounted on the hub. The hub ratio of the impeller is 0.30-0.55, the blade cascade density of the hub-side blades is 1.05-1.793, the blade cascade density of the rim-side blades is 1.02-1.096, and the disk ratio is 0.72-1.14. The impeller blade cascade density of the present invention is several times greater than that of commonly used impellers, and the impeller disk ratio is also much greater. Therefore, a better flow pushing effect can be achieved. The flow pushing speed of the flow pusher of the present invention is large, which can reach more than 0.65m / s, and the flow rate of the flow pushing is large, which can reach 7600m 3 / h or more, with a long flow distance of more than 26m, low power consumption, and specific power less than 0.254W / m 3 .

Description

Technical Field

[0001] The present invention relates to the technical field of submersible flow thrusters, in particular to a submersible flow thruster with low power consumption. Background Art

[0002] Submersible flowmakers, also known as submersible mixers, flow aerators, and flow aerators, are flow-generating devices primarily used in biochemical tanks for municipal and industrial wastewater treatment, as well as in lakes and aquaculture ponds. In industrial wastewater treatment, submersible flowmakers promote the flow of water, increase bottom flow velocity, prevent sludge settling, and improve wastewater treatment efficiency. In lakes, submersible flowmakers can mobilize stagnant water, accelerating circulation. This increases dissolved oxygen levels, revitalizes microorganisms, and enhances their ability to remove pollutants and purify the aquatic environment, ultimately improving the water quality of lakes and reservoirs. In aquaculture ponds, submersible flowmakers can also accelerate water flow, increase oxygen levels, and improve water quality, ultimately increasing aquaculture profitability.

[0003] like Figure 1 As shown, mainstream submersible currentmakers in China consist of four main components: an impeller, a reducer, a submersible motor, and a mounting bracket. The impeller is one of the core components of a submersible currentmaker. Existing impellers are all designed using propeller technology. Thrust is an unwritten hydraulic parameter and the basis for many companies' recommendations when selecting a model. However, the water velocity generated by a high thrust is calculated using the longitudinal resistance formula. This formula calculates the longitudinal resistance of water flowing at a certain speed, but the corresponding thrust does not produce the same water velocity. In practice, only a small portion of the thrust of a traditional submersible currentmaker is converted into water velocity, resulting in very low flow velocity. Therefore, domestic submersible currentmakers only provide thrust data, not water velocity data. Furthermore, excessive thrust consumes a lot of power, resulting in a large motor, bulky size, and a large reducer, making the entire device very heavy. Low energy consumption and miniaturization are the main research directions for submersible currentmakers.

[0004] The impellers of submersible propellers currently on the market are mostly "sickle-shaped" or "banana-shaped" blades with thick roots and narrow tails (such as Figure 2 These blades have poor flow-pushing effects, high power consumption, and the useless power consumption is greater than the useful power consumption.

[0005] After searching the patent database, it is found that the current patents related to submersible thrusters are mainly concentrated on the installation method of the bracket, the material and processing method of the impeller, etc., and there is very little research on the impeller shape. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-power submersible flow thruster, increase the flow thrusting efficiency of the submersible flow thruster, reduce the power consumption of the submersible flow thruster, and reduce the volume of the submersible flow thruster.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A low-power submersible flow propeller includes an impeller, a reducer, a motor, and a bracket. The impeller includes a hub and blades mounted on the hub. Based on the existing technology, the present invention further improves: the hub ratio of the impeller is 0.3-0.55, the blade cascade density of the hub-side blades is 1.05-1.793, the blade cascade density of the rim-side blades is 1.02-1.096, and the disk ratio is 0.72-1.14.

[0009] Preferably, on the same horizontal plane, the blade cascade density of the blades at the center position between the circumference where the hub outer edge is located and the circumference where the blade rim is located is 1.02-1.211.

[0010] Preferably, the axial projection of the impeller is a closed circle.

[0011] Preferably, the axial projection of the impeller is a non-curved closed circle.

[0012] Preferably, the blade is flat and has a uniform thickness of 5-13 mm.

[0013] Preferably, the blade is airfoil-shaped.

[0014] Preferably, the bracket is a double-sided support structure, and both sides of the impeller are supported by the bracket.

[0015] Preferably, the bracket includes two upper hanging frames and two lower supporting frames, and the upper hanging frames and the lower supporting frames are detachably connected.

[0016] Preferably, the bracket further comprises a crossbeam, and the crossbeam is detachably connected between the two upper hanging frames and between the two lower supporting frames.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The blade density and disk ratio of the impeller have an important influence on the flow-pushing speed, and they are positively correlated. The commonly used blade shapes are mostly "sickle-shaped" or "banana-shaped" with a thick root and a narrow tail. The blade density is small. The impeller of this patent has a blade density several times larger than that of the commonly used impeller, and the impeller disk ratio is also much larger. Therefore, a better flow-pushing effect can be achieved. The flow-pushing speed of the flow-pushing device of the present invention is large, which can reach more than 0.65m / s, and the flow rate of the flow-pushing device is large, which can reach 7600m 3 / h or more, with a long flow distance of more than 26m, low power consumption, and specific power less than 0.254W / m 3 The hub of the impeller is cylindrical, and the thickness of the blades is equal at all places, which is easy to process and manufacture; the underwater motor and underwater reducer are small in size; there are brackets on both sides of the impeller, and the overall structure is more compact and stable, reducing the volume of the whole machine. The various components of the bracket are mainly connected by bolts, which is convenient for disassembly and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a submersible flow thruster in the prior art;

[0020] Figure 2 This is a schematic diagram of the structure of a submersible flow thruster blade in the prior art;

[0021] Figure 3 This is a structural diagram of the submersible flow thruster of the present invention;

[0022] Figure 4 Schematic diagram of the three-blade impeller of the submersible flow thruster of the present invention;

[0023] Figure 5 A top view of a three-blade impeller of a submersible flow thruster according to the present invention;

[0024] Figure 6 A top view of a four-blade impeller of a submersible flow thruster according to the present invention;

[0025] Figure 7 A top view of a five-blade impeller of a submersible flow thruster according to the present invention;

[0026] Figure 8 This is an expanded cross-sectional view of the hub-side cascade of the submersible flow thruster of the present invention;

[0027] Figure 9 This is an expanded cross-sectional view of the blade cascade between the hub and the rim of the submersible flow thruster of the present invention;

[0028] Figure 10 This is a schematic diagram of the location of the cascade plate between the hub and the rim of the submersible flow thruster of the present invention;

[0029] Figure 11 This is an expanded cross-sectional view of the rim-side cascade of the submersible flow thruster of the present invention;

[0030] Figure 12 This is a CFD simulation rendering of the first embodiment of the submersible flow thruster of the present invention;

[0031] Figure 13 This is a CFD simulation rendering of the second embodiment of the submersible flow thruster of the present invention;

[0032] Figure 14This is a CFD simulation rendering of the third embodiment of the submersible flow thruster of the present invention;

[0033] Figure 15 This is a CFD simulation rendering of the fourth embodiment of the submersible flow thruster of the present invention;

[0034] Figure 16 This is a CFD simulation rendering of the fifth embodiment of the submersible flow thruster of the present invention;

[0035] Figure 17 This is a schematic diagram of the structure of the motor and reducer of the submersible flow thruster of the present invention;

[0036] Figure 18 This is an exploded view of the submersible flow thruster support structure of the present invention;

[0037] Figure 19 Another top view of the impeller of the submersible flow thruster of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the technical solutions in the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figure 3 The low-power submersible flow propeller provided by the present invention includes an impeller 1, a reducer 2, a motor 3, and a bracket 4. Figure 4-7 As shown, the impeller 1 includes a hub 11 and three to five blades 12 mounted on the hub 11. The number of blades 12 is of course not limited to 3-5, and any other achievable number is also acceptable. The hub 11 of this embodiment is cylindrical. Of course, the shape of the hub 11 is not limited to cylindrical, and any other achievable shape is also acceptable, such as a truncated cone. The orthographic projection of the impeller 1 in this embodiment in the axial direction is a closed circle, as shown in FIG. Figure 5-7 In the top view of the impeller shown in FIG, the orthographic projection of the impeller 1 is a circle, and the curve is continuous. Of course, it is not limited to the orthographic projection of the impeller 1 being a circle, such as Figure 19As shown, a portion of the blade 12 is cut off on both sides, and its orthographic projection is not a complete and continuous circle. The diameter D of the impeller 1 of this embodiment is 1000 mm, the diameter d of the hub 11 is 300 mm, and the height h of the impeller 1 is 350 mm. The blade 12 is in the shape of a flat plate, and its height h2 is 282 mm. The thickness of the blade 12 is uniform throughout, and the thickness is 13 mm. Of course, the shape of the blade 12 is not limited to the flat plate shape of this embodiment, and can also be made into an airfoil shape. The hub ratio of the impeller 1 is 0.3. The impeller 1 with three blades 12 in this embodiment has a disk ratio of 1.03; the impeller 1 with four blades 12 has a disk ratio of 1.07; and the impeller 1 with five blades 12 has a disk ratio of 1.14.

[0041] like Figure 8 As shown, the ratio of the length L1 of the blade plate A of the blade 12 located on the hub 11 side to the cascade pitch t1 is the cascade density a, wherein: for the impeller 1 with three blades 12, the cascade density a is 1.333, and the ratio of the length L1 of the cascade plate A to the impeller diameter D is 0.423; for the impeller 1 with four blades 12, the cascade density a is 1.557, and the ratio of the length L1 of the cascade plate A to the impeller diameter D is 0.366; for the impeller 1 with five blades 12, the cascade density a is 1.793, and the ratio of the length L1 of the cascade plate A to the impeller diameter D is 0.337.

[0042] like Figure 9-10 As shown, the blades 12 are intermediate flat plates extending from the hub 11 side to the rim side. Specifically, on the same horizontal plane, the length of the cascade plate B at the center between the circumference F of the hub 11's outer edge and the circumference H of the blade 12's rim is L2. The ratio of the cascade plate B length L2 to the cascade pitch t2 is the cascade density b. For an impeller 1 with three blades 12, the cascade density b is 1.083, and the ratio of the cascade plate B length L2 to the impeller diameter D is 0.736. For an impeller 1 with four blades 12, the cascade density b is 1.141, and the ratio of the cascade plate B length L2 to the impeller diameter D is 0.582. For an impeller 1 with five blades 12, the cascade density b is 1.211, and the ratio of the cascade plate B length L2 to the impeller diameter D is 0.495.

[0043] like Figure 11 As shown, the ratio of the length L3 of the cascade plate C on the rim side of the blades 12 to the cascade pitch t3 is the cascade density c. For an impeller 1 with three blades 12, the cascade density c is 1.035, and the ratio of the cascade plate length L3 to the impeller diameter D is 1.084. For an impeller 1 with four blades 12, the cascade density c is 1.061, and the ratio of the cascade plate length L3 to the impeller diameter D is 0.834. For an impeller 1 with five blades 12, the cascade density c is 1.096, and the ratio of the cascade plate length L3 to the impeller diameter D is 0.688.

[0044] like Figure 17 As shown, the motor 3 used in this embodiment has a power of 550W, a speed of 1400rpm, and a current of 1.25A. The reducer 2 adopts an NMRV stainless steel reducer, which is mainly used in fountains. It is small in size and light in weight. This small reducer is used in the field of submersible stream thrusters for the first time.

[0045] like Figure 18 As shown, the bracket 4 in this embodiment is a double-sided support structure, supporting both sides of the impeller 1. Specifically, the bracket 4 comprises two upper hanging frames 41 and two lower support frames 42, which are bolted together. The bracket 4 also includes four crossbeams 43, two of which are bolted between the two upper hanging frames 41, and the other two crossbeams 43 are bolted between the two lower support frames 42. The upper hanging frames 41 and the lower support frames 42 are welded together from angle steel, and the four crossbeams 43 are four equal length angle steels. Bearing blocks containing bearings are bolted to the two lower support frames 42. Domestic submersible thrusters typically have their supports on one side of the impeller 1. In this embodiment, the bracket 4 supports both sides of the impeller 1. The center of the impeller 1 is welded to a stainless steel shaft, the ends of which are fixed to bearings within the bearing block, with one end extending through the bearing and connected to the reducer 2. The reducer 2 is fixed to the lower support frame 42 by bolts, and the motor 3 is fixed to the reducer 2 by bolts.

[0046] The submersible flow propeller of this embodiment measured the flow velocity of 0.65m / s at 1m in front of the impeller and 0.1m / s at 20m in front of the impeller. The CFD simulation results are consistent with the test results. Figure 12 As shown, the effective axial flow (speed greater than 0.1m / s) distance is 26m, and the maximum flow diameter is 3.9m. Figure 12 The flow rate at the marked flow calculation section is 7693m 3 / h; The measured motor power is 520W, therefore, the specific power (ratio of flow rate to motor power) of the submersible flow thruster in this embodiment is 0.068W / m 3 .

[0047] Example 2

[0048] The submersible flow propeller of this embodiment has the same structure as that of the first embodiment, except that the diameter D of the impeller 1 is 1000 mm, the diameter d of the hub 11 is 550 mm, the height h of the impeller 1 is 225 mm, and the power of the motor 3 used is 1.1 kW.

[0049] When impeller 1 has three blades 12, the height h2 of blade 12 is 180 mm, the thickness of blade 12 is uniform throughout, and is 10 mm. The hub ratio of impeller 1 is 0.55, and the disk ratio is 0.72. The blade density a is 1.05, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.60. The blade density b is 1.02, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.83. The blade density c is 1.02, and the ratio of the blade plate length L3 to the impeller diameter D is 1.06.

[0050] When impeller 1 has four blades 12, the height h2 of blade 12 is 180 mm, the thickness of blade 12 is uniform throughout, and is 10 mm. The hub ratio of impeller 1 is 0.55, and the disk ratio is 0.74. The blade density a is 1.08, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.47. The blade density b is 1.04, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.64. The blade density c is 1.03, and the ratio of the blade plate length L3 to the impeller diameter D is 0.81.

[0051] When impeller 1 has five blades 12, the height h2 of blade 12 is 180 mm, the thickness of blade 12 is uniform throughout, and is 10 mm. The hub ratio of impeller 1 is 0.55, and the disk ratio is 0.75. The blade density a is 1.13, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.39. The blade density b is 1.07, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.52. The blade density c is 1.04, and the ratio of the blade plate length L3 to the impeller diameter D is 0.65.

[0052] The CFD prediction of the submersible flow propeller in this embodiment shows that the velocity at 5m in front of the flow propeller reaches above 0.55m / s. Figure 13 As shown, the effective axial flow (flow velocity not less than 0.1m / s) distance is 34.8m, and the maximum flow diameter is 4.08m. Figure 13 The cross-sectional flow rate at the marked flow calculation section is 9846m 3 / h; the motor power is 994W, so the specific power of the submersible flowmeter (the ratio of the flow rate to the motor power) is 0.101W / m 3 .

[0053] Example 3

[0054] The submersible flow propeller of this embodiment has the same structure as that of the first and second embodiments, except that the diameter D of the impeller 1 is 580 mm, the diameter d of the hub 11 is 240 mm, the height h of the impeller 1 is 170 mm, and the power of the motor 3 used is 1.5 kW.

[0055] When impeller 1 has three blades 12, the height h2 of blade 12 is 140 mm, the thickness of blade 12 is uniform throughout, and is 5 mm. The hub ratio of impeller 1 is 0.4414, and the disk ratio is 0.88. The blade density a is 1.13, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.49. The blade density b is 1.04, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.77. The blade density c is 1.03, and the ratio of the blade plate length L3 to the impeller diameter D is 1.07.

[0056] When impeller 1 has four blades 12, the height h2 of blade 12 is 136 mm, the thickness of blade 12 is uniform throughout, and is 5 mm. The hub ratio of impeller 1 is 0.4414, and the disk ratio is 0.92. The blade density a is 1.23, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.40. The blade density b is 1.08, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.60. The blade density c is 1.04, and the ratio of the blade plate length L3 to the impeller diameter D is 0.82.

[0057] When impeller 1 has five blades 12, the height h2 of blade 12 is 136 mm, the thickness of blade 12 is uniform throughout, and is 5 mm. The hub ratio of impeller 1 is 0.4414, and the disk ratio is 0.96. The blade density a is 1.34, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.35. The blade density b is 1.13, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.51. The blade density c is 1.07, and the ratio of the blade plate length L3 to the impeller diameter D is 0.67.

[0058] The CFD prediction of the submersible flow propeller in this embodiment shows that the velocity at 5m in front of the flow propeller reaches above 0.7m / s. Figure 14 As shown, the effective axial flow (flow rate not less than 0.1m / s) distance is 31.6m, and the maximum flow diameter is 4.24m. Figure 14 The cross-sectional flow rate at the marked flow calculation section is 8620m 3 / h; the motor power is 1.22KW, so the specific power of the submersible flowmeter (the ratio of the flow rate to the motor power) is 0.142W / m 3 .

[0059] Example 4

[0060] The submersible propeller of this embodiment has the same structure as that of embodiments one, two and three, except that: the diameter D of the impeller 1 is 500 mm, the diameter d of the hub 11 is 180 mm, the height h of the impeller 1 is 160 mm, the height h2 of the blade 12 is 130 mm, the thickness of the blade 12 is uniform throughout, and the thickness is 6 mm. The hub ratio of the impeller 1 is 0.36, and the power of the motor 3 used is 3 kW.

[0061] When impeller 1 has three blades 12, the disk ratio is 0.94. The blade density a is 1.21, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.46. The blade density b is 1.06, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.756. The blade density c is 1.03, and the ratio of the length L3 of the blade plate to the impeller diameter D is 1.08.

[0062] When impeller 1 has four blades 12, the disk ratio is 0.99. The blade density a is 1.35, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.38. The blade density b is 1.11, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.59. The blade density c is 1.05, and the ratio of the length L3 of the blade plate to the impeller diameter D is 0.83.

[0063] When impeller 1 has five blades 12, the disk ratio is 1.06. The blade density a is 1.51, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.34. The blade density b is 1.16, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.50. The blade density c is 1.08, and the ratio of the length L3 of the blade plate to the impeller diameter D is 0.68.

[0064] The CFD simulation of the submersible flow propeller in this embodiment shows a velocity of 1.3 m / s or more at 5 m in front of the flow propeller. Figure 15 As shown, the effective axial flow (flow velocity not less than 0.1m / s) distance is 35.8m, and the maximum flow diameter is 6.0m. Figure 15 The cross-sectional flow rate at the marked flow calculation section is 20257m 3 / h; the motor power is 2.52KW, so the specific power of the submersible flowmeter (the ratio of the flow rate to the motor power) is 0.124W / m 3 .

[0065] Example 5

[0066] The submersible flow propeller of this embodiment has the same structure as that of embodiments 1, 2, 3, and 4, except that: the diameter D of the impeller 1 is 630 mm, the diameter d of the hub 11 is 220 mm, the hub-to-hub ratio is 0.349, the height h of the impeller 1 is 205 mm, the height h2 of the blades 12 is 170 mm, the thickness of the blades 12 is uniform throughout, 7 mm, and the hub-to-hub ratio of the impeller 1 is 0.35. The motor 3 used has a power of 7.5 kW.

[0067] When impeller 1 has three blades (12), the disk ratio is 0.95. The blade density a is 1.23, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.45. The blade density b is 1.07, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.752. The blade density c is 1.03, and the ratio of the length L3 of the blade plate to the impeller diameter D is 1.08.

[0068] When impeller 1 has four blades (12), the disk ratio is 1.01. The blade density a is 1.38, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.38. The blade density b is 1.11, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.59. The blade density c is 1.05, and the ratio of the length L3 of the blade plate to the impeller diameter D is 0.83.

[0069] When impeller 1 has five blades (12), the disk ratio is 1.08. The blade density a is 1.54, and the ratio of the length L1 of blade plate A to the impeller diameter D is 0.34. The blade density b is 1.17, and the ratio of the length L2 of blade plate B to the impeller diameter D is 0.50. The blade density c is 1.08, and the ratio of the length L3 of the blade plate to the impeller diameter D is 0.68.

[0070] The CFD simulation of the submersible flow propeller in this embodiment shows a velocity of 2.0 m / s or more at 5 m in front of the flow propeller. Figure 16 As shown, the effective axial flow (flow velocity not less than 0.1m / s) distance is 38m, and the maximum flow diameter is 7.85m. Figure 16 The cross-sectional flow rate at the marked flow calculation section is 29361m 3 / h; the motor power is 7.45KW, so the specific power of the submersible flowmeter (the ratio of the flow rate to the motor power) is 0.254W / m 3 .

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-power submersible flow propeller, comprising an impeller, a reducer, a motor, and a bracket, wherein the impeller comprises a hub and blades mounted on the hub, and is characterized in that: The hub ratio of the impeller is 0.3-0.55, the blade cascade density of the hub side blades is 1.05-1.793, the blade cascade density of the rim side blades is 1.02-1.096, and the disk ratio is 0.72-1.14; On the same horizontal plane, the blade cascade density at the center between the circumference of the hub outer edge and the circumference of the blade rim is 1.02-1.211; The blades are flat and have a uniform thickness of 5-13 mm. The bracket is a double-sided support structure, and both sides of the impeller are supported by the bracket; The bracket includes two upper hanging frames and two lower supporting frames, and the upper hanging frames and the lower supporting frames are detachably connected; The bracket further comprises a crossbeam which is detachably connected between the two upper hanging frames and between the two lower supporting frames.

2. The low-power submersible flow propeller according to claim 1, characterized in that: The orthographic projection of the impeller in the axial direction is a circle, and the curve is continuous.

3. The low-power submersible flow propeller according to claim 1, characterized in that: The orthographic projection of the impeller in the axial direction is not a complete and continuous circle.

4. The low-power submersible flow propeller according to claim 1, characterized in that: The blade is in the shape of an airfoil.

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