Portable miniature power generation device

Abstract

A portable miniature power generation device comprises a shell structure with a coaxial main body, the shell comprises an outer barrel and an inner barrel, the outer barrel is roughly cylindrical, the front end of the outer barrel is processed or molded to form a conical contracted air inlet, and the conical structure serves as an air collecting cover and can effectively gather and accelerate natural airflow and improve wind energy flux at low wind speed; the inner barrel is coaxially and fixedly arranged in the outer barrel, and a uniform annular gap is reserved between the inner barrel and the outer barrel. Due to the fact that the double-layer barrel structure is creatively adopted, natural airflow is compressed and accelerated through the conical air inlet in the front end of the outer barrel, the wind energy flux at the low wind speed is remarkably improved, and meanwhile the wind energy efficiency is improved. The main impeller adopts a streamline conical surface matched with the main impeller, the air inlet resistance is greatly reduced, the problem that a traditional exposed impeller device is difficult to start or extremely low in efficiency in a breeze environment is fundamentally solved through the composite pneumatic optimization design, and the device can effectively work in weak airflow.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy power generation equipment technical field, concretely relates to a portable micro power generation device. BACKGROUND

[0002] As a kind of clean renewable energy, wind energy is widely concerned in miniaturization, portable application field, existing portable wind power generation equipment, such as hand generator or small wind power power bank, many adopt the simple structure of bare impeller direct drive generator, wind energy capture efficiency of this structure is low, lack of airflow optimization, it is difficult to start in breeze environment, and impeller low speed and generator high speed are not matched, resulting in electromechanical conversion efficiency is low, output power is weak.

[0003] At the same time, in the field of vehicle-mounted energy recovery, some devices aimed at recovering airflow kinetic energy in vehicle driving appear, for example, the Chinese invention patent application with publication number "CN119787720A" discloses an "energy collection device", which generates additional electric energy by setting piezoelectric plate that can be hit by rotating blade in airflow channel;Another Chinese invention patent application with publication number "CN119787721A" discloses another "energy collection device", which uses impact member that can move centrifugally with rotating speed to hit piezoelectric element to generate electricity, and has high-speed protection function.

[0004] However, the above two kinds of schemes have obvious limitations: first, simple portable device is low in efficiency, second, vehicle-mounted energy recovery device generally adopts "impact-piezoelectric" power generation method, which is low in energy conversion efficiency, complex in structure, and piezoelectric element life is easily affected by high-speed high-frequency impact, more importantly, these vehicle-mounted devices are fixed integrated components designed for specific vehicle models, which are complex in structure, large in size, completely without portability, universality and application positioning of charging personal equipment, they cannot be used as independent, flexible deployment micro power generation module.

[0005] Therefore, the current market urgently needs a micro power generation device that can efficiently capture and convert low-grade wind energy, fundamentally solve the speed matching problem, and innovatively adopt more efficient and reliable mechanical energy recovery method, while being compact and portable, and having multi-scene adaptation capability. UTILITY MODEL CONTENT

[0006] The utility model aims at overcoming the insufficient of prior art, provide a kind of portable micro power generation device with high wind energy utilization rate, low wind speed starting performance is good, and innovatively realizes exhaust kinetic energy recovery.

[0007] The technical scheme adopted to solve the above technical problems is:

[0008] A portable micro power generation device, comprising a shell, comprising an outer cylinder and an inner cylinder coaxially arranged in the outer cylinder, the front end of the outer cylinder is provided with a tapered inlet, an annular exhaust passage is formed between the inner cylinder and the outer cylinder, and the device further comprises:

[0009] A main impeller is rotatably supported at the front end of the inner cylinder by a main shaft and located behind the inlet;

[0010] A power generation unit is accommodated in the inner cylinder, the power generation unit comprises a micro generator and an energy recovery unit, the energy recovery unit comprises an annular driven impeller rotatably arranged in the exhaust passage by a bearing and a connecting piece, the connecting piece drivingly connects the inner ring of the annular driven impeller with the main shaft to make them rotate synchronously, and the chord of the blades of the main impeller and the annular driven impeller is at an angle with the airflow direction, so that a pressure difference is formed between the windward surface and the leeward surface when the airflow flows through the blades to generate lift to push the blades to rotate.

[0011] The blades of the main impeller and the annular driven impeller are preferably designed in a wing section, and the chord of the blades is at a preset angle (i.e. angle of attack) with the direction of the airflow entering the inlet, which makes a significant pressure difference between the windward surface and the leeward surface when the airflow flows through the blades, thereby generating lift to push the blades to rotate. This aerodynamic optimization, combined with the acceleration effect of the tapered inlet, ensures that the device can still obtain sufficient starting torque and rotational kinetic energy under weak wind speed, fundamentally solving the problem of "flapping wind" or "slip flow" failure of traditional blades under low wind speed.

[0012] As a preferred technical scheme of the utility model, the connecting piece is a flange fixedly connected to the main shaft, and the flange is fixedly connected to the inner ring of the annular driven impeller through spokes.

[0013] As a preferred technical scheme of the utility model, the power generation unit further comprises a gear speed increasing mechanism, the gear speed increasing mechanism is arranged in the inner cylinder and drivingly connected between the main shaft and the input shaft of the micro generator.

[0014] As a preferred technical scheme of the utility model, the gear speed increasing mechanism is a planetary gear set or a parallel shaft multi-stage gear set.

[0015] As a preferred technical scheme of the utility model, the windward surface of the main impeller is a streamlined tapered surface matched with the inlet.

[0016] As a preferred technical scheme of the utility model, an installation plate is fixedly connected to the outer side of the outer cylinder, and the installation plate is provided with a mounting structure for fixing the entire device to an external support.

[0017] As a preferred technical scheme of the utility model, the installation structure is one or more combinations of a through hole opened on the installation plate, a magnetic attraction piece arranged on the installation plate, a buckle or a bandage.

[0018] As a preferred technical scheme of the utility model, the power management module is electrically connected to the output end of the micro generator and is integrated with a rectifier circuit, a voltage stabilizing circuit and a USB interface.

[0019] As a preferred technical scheme of the utility model, the support bearing of the main rotating shaft and the annular driven impeller is a ball bearing or an oil-containing bushing.

[0020] As a preferred technical scheme of the utility model, the outer cylinder, the inner cylinder, the main impeller and the annular driven impeller are made of engineering plastics or aluminum alloy.

[0021] The utility model has the advantages of:

[0022] 1. The utility model discloses a "double-layer cylinder" structure, which compresses and accelerates natural airflow through the conical air inlet at the front end of the outer cylinder, significantly improves the wind energy flux under low wind speed, and the main impeller adopts a streamlined conical surface matched therewith, so that the air inlet resistance is greatly reduced.

[0023] 2. The utility model discloses a gear speed increasing mechanism, a micro generator and other core components are integrated in the closed inner cylinder, the wind energy obtained by the main rotating shaft (driven by the main and driven impellers) is lifted to the high-efficiency working speed range of the micro generator through the gear speed increasing mechanism.

[0024] 3. The utility model discloses a mechanical recovery structure that the annular driven impeller is rigidly synchronized with the main rotating shaft through the connecting piece, which directly drives the annular driven impeller by using exhaust kinetic energy, and efficiently and same-directionally superimposes the recovered mechanical energy to the main rotating shaft through the flange plate, spoke and other connecting pieces, realizes direct and efficient recovery of the remaining wind energy, and has the advantages of simple and reliable structure, clear energy transmission path and significantly better durability than the piezoelectric scheme. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a three-dimensional structure schematic view of the utility model embodiment.

[0026] Figure 2 It is a longitudinal main body sectional view of the utility model embodiment.

[0027] Figure 3 It is an explosion structure schematic view of the utility model.

[0028] Figure 4 It is a rear view structure schematic view of the utility model.

[0029] In the figure: 1, outer cylinder body;101, air inlet;102, mounting plate;103, mounting structure;2, inner cylinder body;3, exhaust passage;4, main impeller;401, main rotating shaft;5, annular driven impeller;501, flange plate;502, spoke;6, micro generator;7, gear speed increasing mechanism;8, power management module;801, USB interface. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. The components of the utility model embodiment described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0032] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the above description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "one side", "the other side" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the utility model product when it is usually placed, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] Moreover, the term "same" and the like terms do not mean that the components must be absolutely the same, but there can be slight differences. The term "vertical" merely means that the positional relationship between the components is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly inclined. Embodiments

[0035] In Figures 1-4 The utility model provides a kind of portable micro power generation device, its core design concept is in to realize the efficient capture and recovery of wind energy by a double-layer cylinder structure, and all functional components are highly integrated, to realize miniaturization and portability.

[0036] Specifically, the main body of the device is a coaxial shell structure, which includes an outer cylinder 1 and an inner cylinder 2. The outer cylinder 1 is generally cylindrical, and its front end (i.e., the windward end) is machined or molded into a tapered inlet 101. The tapered structure serves as a wind collector, which can effectively collect and accelerate natural airflow, increasing the wind energy flux at low wind speeds. The inner cylinder 2 is coaxial with the outer cylinder 1 and is fixedly arranged inside the outer cylinder 1. A uniform annular gap is maintained between the two, which forms an annular exhaust passage 3. The inner cylinder 2 forms a sealed chamber inside for accommodating transmission and power generation components.

[0037] The main impeller 4 is rotatably supported at the front end of the inner cylinder 2 by a main shaft 401. Specifically, the main shaft 401 is installed in the bearing seat at the front end of the inner cylinder 2 through at least two bearings (such as deep groove ball bearings), ensuring smooth rotation. The main impeller 4 is fixedly installed at the front end of the main shaft 401 and is accurately positioned behind the optimal flow field area of the tapered inlet 101. Preferably, the hub windward surface of the main impeller 4 is also designed as a streamlined tapered surface that matches the taper of the inlet 101, to minimize wind resistance and achieve smooth transition and efficient driving of airflow.

[0038] Further, each blade of the main impeller 4 and the annular driven impeller 5 can adopt an airfoil section. A preset installation angle is provided at the blade root and the hub fixing position, so that the blade chord line maintains an optimized angle, for example, between 5° and 20°, with the incoming flow direction of the inlet 101. When the airflow accelerated by the tapered inlet 101 impacts the blade at this angle, a pressure difference is generated on the upper and lower surfaces of the blade, forming a tangential lift component that drives the impeller to rotate. This design enables the main impeller 4 and the annular driven impeller 5 to achieve higher aerodynamic efficiency and starting torque at low wind speeds, minimizing wind resistance and achieving smooth transition and efficient driving of airflow. When the airflow enters from the inlet 101, it directly acts on the blades of the main impeller 4, driving the main impeller 4 to rotate together with the main shaft 401, completing the first capture of wind energy and converting it into mechanical energy.

[0039] Second, one of the key innovations of the utility model lies in setting the energy recovery unit for recovering the residual kinetic energy of the airflow after the work of the main impeller 4, the energy recovery unit comprising a ring driven impeller 5 and a set of connecting pieces, the ring driven impeller 5 being rotatably arranged in the exhaust passage 3 through the bearings on the outer edge or special wheel hub (for example, the bearing outer ring is fixed on the corresponding support of the outer cylinder body 1 or the inner cylinder body 2), the blade profile and mounting angle of the ring driven impeller 5 being specially optimized for efficiently capturing the exhaust airflow flowing out from the rear of the main impeller 4 and still having a certain speed and rotation tendency.

[0040] In the specific implementation of the connecting piece: in order to realize efficient transmission of recovered energy, the connecting piece rigidly connects the inner ring of the ring driven impeller 5 with the main shaft 401, ensuring that the two rotate completely synchronously, and in a preferred embodiment, as shown in Figure 2 and Figure 3 The connecting piece comprises a flange plate 501 and a plurality of spokes 502, the flange plate 501 being fixedly sleeved on the main shaft 401 through key connection, tight fit or threaded fastening, etc., the plurality of spokes 502 (for example, 3-6) being evenly distributed in the circumferential direction, one end of each of the plurality of spokes 502 being fixedly connected with the outer edge of the flange plate 501, and the other end being fixedly connected with the inner ring of the ring driven impeller 5, such a "flange plate-spoke" structure not only has firm connection and can reliably transmit torque, but also has a hollow design that has little hindrance to the exhaust airflow, ensuring smooth airflow, and through the connecting piece, when the exhaust airflow drives the ring driven impeller 5 to rotate, the rotary power will be directly superimposed on the main shaft 401 without loss, providing additional auxiliary driving torque for the main shaft 401, and realizing secondary recovery of energy.

[0041] In the basic implementation of the power generation unit: the rear end of the main shaft 401 extends into the sealed chamber of the inner cylinder body 2 and is connected with the power generation unit, the power generation unit comprising at least one micro generator 6, in order to increase the low speed of the main shaft 401 (which has been driven by the main and driven impellers) to the efficient working speed of the micro generator 6, the power generation unit preferably further comprises a gear speed increasing mechanism 7, as shown in Figure 2 and Figure 3 The input end (low speed end) of the gear speed increasing mechanism 7 is connected with the rear end of the main shaft 401, and the output end (high speed end) thereof is connected with the input shaft of the micro generator 6, the gear speed increasing mechanism 7 can adopt a planetary gear set with high transmission ratio and compact structure, or a traditional parallel shaft multi-stage gear set, and its function is to significantly increase the speed transmitted to the micro generator 6, thereby greatly improving the electromechanical conversion efficiency of single-way power generation.

[0042] In another extended embodiment of the utility model, in order to pursue higher total output power in the scene of abundant wind energy (such as installation on the bicycle or car driving at high speed), the gear speed increasing mechanism 7 can be specifically designed as a split type gear box with single input shaft and multiple output shafts, for example, a planetary gear train (sun gear as input) can drive multiple evenly distributed planet gears, each planet gear drives a micro generator 6 through an independent output shaft, or multiple parallel gear pairs are used for power split, in this extended scheme, the main rotating shaft 401 accelerated through the conical air inlet 101 and driven by the primary and secondary impellers is input to the split type gear speed increasing mechanism 7, the mechanism not only completes the speed increasing function, but also distributes power to multiple micro generators 6 (for example, 2 groups, 3 groups or 4 groups) simultaneously and in parallel, so that they rotate at high speed synchronously and generate electricity together, and the output of each micro generator 6 can be connected to the subsequent power management module in parallel, this design realizes the driving of multiple power generation units through single point wind energy input in limited volume, thereby doubling the total power generation of the device, and meets the portable or vehicle-mounted charging scene with higher power demand.

[0043] In order to realize the multifunctional application of the device, as shown in Figure 1 As shown in the drawings, an installation plate 102 is fixedly connected to the outer side wall of the outer cylinder body 1 in a welded, bolted or integrally formed manner, and a general installation structure 103 is arranged on the installation plate 102, such as Figure 1 And Figure 4 As shown in the drawings, the installation structure 103 can be a plurality of regularly arranged through holes, facilitating the fixation by bolts, straps or ropes (not completely shown), or can be embedded powerful magnets for rapid adsorption on metal surfaces (such as car body, railings), or can be standard buckle interfaces or lugs for passing through straps, so that the device is stably installed on the bicycle or other vehicles through the installation plate 102 and the straps, which makes the device change from a pure handheld / placed portable device to a semi-fixed power station that can be flexibly deployed in mobile or fixed scenes.

[0044] In the tail part of the inner cylinder body 2 or an independent sealed chamber, an electric power management module 8 is integrated, which is connected with the electric energy output end of the micro generator 6 (or multiple micro generators) through wires, and the electric power management module 8 internally integrates standard circuits including rectifier bridge stack (for converting alternating current into direct current), DC-DC switching stabilizer (for stabilizing unstable direct current voltage to 5V), overvoltage and overcurrent protection chip and intelligent charging management IC, and finally provides stable and safe 5V direct current power through a standard USB interface 801 (such as USB-A or USB-C) to the outside, which can directly charge smart phones, mobile power supplies, navigation devices, lighting lamps and other equipment.

[0045] Wherein, for optimizing performance, the support of the main shaft 401 and the annular driven impeller 5 preferably adopts the micro ball bearing with low friction coefficient or the self-lubricating oil-filled bushing to reduce mechanical loss and improve the breeze starting performance, for reducing the overall weight, the main structural members such as the outer cylinder 1, the inner cylinder 2, the main impeller 4 and the annular driven impeller 5 are preferably made of high-strength engineering plastics (such as polycarbonate, glass fiber reinforced nylon) by injection molding process, or made of aluminum alloy by die casting or machining.

[0046] In summary, the utility model discloses a high-efficiency wind power utilization, excellent portability and wide adaptability micro power generation device through the ingenious double-layer cylinder fluid design, the efficient rigid connection of main / driven impeller and main shaft, the optional gear speed-up and power split technology, and the modular installation and electric control design, and the skilled in the art can understand that without departing from the principle of the utility model, the specific connection mode, gear type, mounting structure etc.

[0047] The working principle of the utility model is as follows: the natural wind is first introduced by the conical air inlet 101 in front of the device, the conical structure is used as a wind collector, which compresses and accelerates the incoming air, effectively improves the airflow speed, and the accelerated airflow directly acts on the blades of the main impeller 4 to drive the main impeller 4 to rotate. The main impeller 4 converts the captured wind energy into rotary mechanical energy through the main shaft 401, which is the first energy capture. Then the rotary mechanical energy is transmitted backward through the main shaft 401, which is used to drive the micro generator 6 to generate electricity through the gear speed-up mechanism 7 (such as planetary gear set) to match the high-efficiency working speed of the micro generator 6. On the other hand, the airflow after the work of the main impeller 4 is not directly dissipated, but enters the annular exhaust passage 3 formed by the outer cylinder 1 and the inner cylinder 2. Through the annular exhaust passage 3, the airflow still has kinetic energy and rotation tendency, which drives the annular driven impeller 5 to rotate. The annular driven impeller 5 is rigidly connected to the main shaft 401 through the flange plate 501 and the spoke 502, so that the rotation power is directly superimposed on the main shaft 401, and an auxiliary driving torque in the same direction is applied to the main shaft 401, realizing the secondary recovery of the exhaust airflow kinetic energy.

[0048] Finally, the main impeller 4 is driven by the primary capture and the ring driven impeller 5 is driven by the secondary recovery, and the main shaft 401 is driven by the gear speed increasing mechanism 7 with higher rotating speed and torque, the mechanism transmits power to the micro generator 6, and the power generation efficiency is improved obviously, the generated electric energy is rectified and stabilized by the power management module 8, and then the stable direct current is output through the USB interface 801 to charge the external equipment, the whole device can be fixed in various scenes through the mounting plate 102 and the mounting structure 103, and the whole process from wind starting to high-efficiency power generation is realized.

[0049] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

[0050] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit, although the utility model is described in detail with reference to the preferred embodiments, the person skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and they should be covered in the claim range of the utility model.

Claims

1. A portable micro power generation device comprising a housing, characterised in that: The device comprises an outer cylinder (1) and an inner cylinder (2) coaxially arranged in the outer cylinder (1), the front end of the outer cylinder (1) is provided with a tapered air inlet (101), an annular exhaust passage (3) is formed between the inner cylinder (2) and the outer cylinder (1), and the device further comprises: a main impeller (4) rotatably supported on the front end of the inner cylinder (2) by a main shaft (401) and located behind the air inlet (101); a power generation unit accommodated in the inner cylinder (2), the power generation unit comprising a micro generator (6) and an energy recovery unit, the energy recovery unit comprising an annular driven impeller (5) rotatably arranged in the exhaust passage (3) by a bearing and a connecting piece drivingly connecting the inner ring of the annular driven impeller (5) with the main shaft (401) to make them rotate synchronously, and the chord of the blades of the main impeller (4) and the annular driven impeller (5) forms an angle with the airflow direction, so that a pressure difference is formed between the windward surface and the leeward surface when the airflow flows through the blades to generate lift to push the blades to rotate.

2. The portable micro power generation device of claim 1, wherein: The connecting piece is a flange plate (501) fixedly connected to the main shaft (401), and the flange plate (501) is fixedly connected to the inner ring of the annular driven impeller (5) by spokes (502).

3. The portable micro power generation device of claim 2, wherein: The power generation unit further comprises a gear speed increasing mechanism (7) arranged in the inner cylinder (2) and drivingly connected between the main shaft (401) and the input shaft of the micro generator (6).

4. The portable micro power generation device according to claim 3, characterized by: The gear speed increasing mechanism (7) is a planetary gear set or a parallel shaft multi-stage gear set.

5. The portable micro power generation device of claim 1, wherein: The windward surface of the main impeller (4) is a streamlined conical surface matched with the air inlet (101).

6. The portable micro power generation device of claim 1, wherein: An installation plate (102) is fixedly connected to the outer side of the outer cylinder (1), and the installation plate (102) is provided with a mounting structure (103) for fixing the entire device to an external support.

7. The portable micro power generation device of claim 6, wherein: The mounting structure (103) is one or a combination of through holes opened on the installation plate (102), magnetic members, buckles or straps arranged on the installation plate (102).

8. The portable micro power generation device of claim 1, wherein: The device further comprises a power management module (8) electrically connected to the output end of the micro generator (6) and integrated with a rectifier circuit, a voltage stabilizing circuit and a USB interface (801).

9. The portable micro power generation device of claim 1, wherein: The supporting bearings of the main shaft (401) and the annular driven impeller (5) are ball bearings or oil-containing bushings.

10. The portable micro power generation device of claim 1, wherein: The outer cylinder (1), the inner cylinder (2), the main impeller (4) and the annular driven impeller (5) are made of engineering plastics or aluminum alloy.

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