CN205744310U - Blade of wind-driven generator, blade de-icing device and wind power generating set - Google Patents

Abstract

The utility model provides a wind turbine blade, a blade deicing device and a wind turbine set. The wind turbine blade includes a blade root and a blade main body; it also includes: an air inlet, which is arranged at the blade root; an air outlet, which is arranged on the outer surface of the blade main body; and an air channel, which is arranged inside the wind turbine blade and connected to the air inlet. and the air outlet; the backflow prevention mechanism is arranged at the air outlet; the heat conductive component connects the air channel and the outer surface of the wind turbine blade. The wind turbine blade provided by the embodiment of the present utility model is provided with an air channel to connect the cabin with the air inlet of the blade, thereby transferring the heat generated by the heating element to the surface of the wind turbine blade, thereby achieving a deicing effect. At the same time, by adding an anti-backflow mechanism at the air outlet, moisture in the air or water from melted ice is prevented from entering the interior of the blades.

Description

Wind turbine blades, blade deicing devices and wind turbines

technical field

The utility model relates to the technical field of wind power generation, in particular to a wind power generator blade, a blade deicing device and a wind power generator set.

Background technique

The direct-drive permanent magnet wind turbine is directly connected to the hub and consists of a shaft, rotor, stator and a circular shell. During the working process, when the rotor rotates, it drives the permanent magnetic poles installed in the rotor to rotate, thereby generating a rotating magnetic field, and through the rotating magnetic field, the cutting motion in the stator winding on the stator generates an electromotive force, thereby converting mechanical energy into electrical energy. During this process, the rotation of the rotor will generate a large amount of heat. Usually, pipes are connected to the radiator on the rotor shell facing the hub or facing away from the hub, so that the heat is transferred to the radiator through the pipes for heat dissipation, and at the same time, it is transferred to the radiator on the stator. Through holes are provided for air to flow into the generator.

However, at present, for direct-drive wind turbines installed in cold regions, due to the cold environment, it is easy to cause the blades to freeze, and the weight of the blades increases, which reduces the speed of rotation with the wind, resulting in a series of problems, such as wind power generation These problems will seriously affect the performance of the wind turbine and the service life of its components.

Utility model content

Embodiments of the utility model provide a blade of a wind power generator, a blade deicing device, and a wind power generator set, so as to solve the problem in the prior art that ice is formed on the surface of the blade and is difficult to remove.

In order to achieve the above purpose, an embodiment of the present utility model provides a blade of a wind power generator, including a blade root and a blade body; it also includes: an air inlet arranged at the blade root; an air outlet arranged at the outer surface of the blade body; The air channel is arranged inside the blade of the wind power generator and communicates with the air inlet and the air outlet; the anti-backflow mechanism is arranged at the air outlet; the heat conduction part is connected with the outer surface of the air channel and the blade of the wind power generator.

Optionally, the heat conduction part includes a heat absorbing part, a conduction part and a heat dissipation part, the heat absorbing part is arranged on the inner wall and/or the outer wall of the air channel; the heat dissipation part is arranged on the outer surface of the wind generator blade and/or the wind generator Inside the outer surface of the blade; the conduction part connects the heat absorbing part and the heat dissipating part.

Optionally, a bracket is also provided inside the blade of the wind power generator, and the air channel is fixedly connected to the inner surface of the blade of the wind power generator through the bracket.

Optionally, the heat conducting component is made of heat conducting metal.

Optionally, the backflow prevention mechanism is a one-way valve.

According to the second aspect of the utility model, an embodiment of the utility model provides a blade deicing device, which includes a cabin for accommodating heating elements and a hub, and also includes: the aforementioned wind turbine blade connected to the hub; a heat transfer channel, The air inlet connecting the cabin and the blades of the wind turbine.

Optionally, the heating element includes a generator; the cabin includes a first cabin, and the first cabin is an inner cavity of the generator; the heat transfer channel includes a first heat transfer channel; the first heat transfer channel includes: a rotor bracket connection port, which runs through The rotor bracket communicates with the first compartment; the air duct, one end of which is connected to the connecting port of the rotor bracket, and the other end is connected to the air inlet.

Optionally, the hub is provided with an opening; one end of the air duct is arranged outside the hub and connected to the connection port of the rotor bracket; the other end of the air duct enters the interior of the hub through the opening, and is connected to the air inlet of the wind turbine blade connected.

Optionally, an insulation layer is provided on the outside of the air duct.

Optionally, the heating element includes a converter or a main control switch cabinet; the compartment includes a second compartment for accommodating the converter or a main control switch cabinet; the heat transfer channel includes a second heat transfer channel; the second heat transfer channel includes : a transfer mechanism, which includes a first interface and a second interface, a rotatable sealing connection between the first interface and the second interface; a first connecting pipe, connecting the second cabin and the first interface of the transfer mechanism; the second The connecting pipe connects the second interface of the adapter mechanism and the air inlet of the blade of the wind power generator.

Optionally, the heating element also includes a converter or a main control switch cabinet; the compartment also includes a second compartment for accommodating the converter or a main control switch cabinet; the heat transfer channel also includes a second heat transfer channel; The hot channel includes: a transfer mechanism, which includes a first interface and a second interface, and a relatively rotatable sealed connection between the first interface and the second interface; a first connecting pipe, connecting the second compartment and the first port of the transfer mechanism. The interface; the second connecting pipe, which connects the second interface of the adapter mechanism and the air inlet of the blade of the wind power generator.

According to the third aspect of the utility model, the embodiment of the utility model provides a wind power generating set, including the aforementioned blade deicing device.

The advantages and positive effects that the utility model has are:

The blade provided by the embodiment of the utility model connects the cabin with the air inlet of the blade by setting an air channel. When the blade rotates, the air pressure in the cabin will be greater than the air pressure at the blade, and then a moving airflow will be generated. The heat in the cabin can be transferred to the air outlet through the air channel, and then the area near the air outlet can be heated, thereby melting the ice on the surface of the blade, avoiding the change of the blade airfoil, the increase of the impeller mass, the increase of the unbalance of the impeller, and the fan Occurrence of load increase etc. At the same time, by adding an anti-backflow mechanism at the air outlet, moisture in the air or water after melting ice is prevented from entering the interior of the blade.

Description of drawings

Fig. 1 is a schematic structural diagram of a wind turbine blade provided by Embodiment 1 of the present utility model;

Fig. 2 is a schematic structural diagram of the blade deicing device provided by the second embodiment of the utility model;

Fig. 3 is a working principle diagram of the blade deicing device in Fig. 2;

Fig. 4 is a schematic structural view of the blade deicing device provided by the third embodiment of the present invention.

Explanation of reference signs:

1. Wind turbine blade; 11. Blade root; 12. Blade main body; 14. Air channel; 141. Air inlet; 142. Air outlet; 15. Backflow prevention mechanism; 2. Hub; 21. Fixed bracket; 22. Opening; 4, rotor bracket; 41, rotor bracket connection port; 5, transfer mechanism; 40, first compartment; 50, second compartment; 100, air duct; 200, first connecting pipe; 300, second connecting pipe .

detailed description

Exemplary embodiments of embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

Fig. 1 is a schematic structural diagram of a wind power generator blade provided by Embodiment 1 of the present utility model; an embodiment of the present utility model provides a wind power generator blade 1, including a blade root 11 and a blade main body 12; also includes: air intake The port 141 is located at the blade root 11; the air outlet 142 is located at the outer surface of the blade main body 12; the air channel 14 is provided inside the wind turbine blade 1 and communicates with the air inlet 141 and the air outlet 142; the backflow prevention mechanism 15 , located at the air outlet 142 ; the heat conduction component connects the air channel 14 and the outer surface of the wind turbine blade 1 .

The wind power generator blade 1 provided in Embodiment 1, by setting the blade air channel 14 inside and the air outlet 142 on the outer surface, when the wind power generator blade 1 rotates with the hub 2, between the air inlet 141 and the air outlet 142 Forming an air pressure difference (the specific principle of forming an air pressure difference will be described in conjunction with the blade deicing device in Embodiment 2). Under the action of the air pressure difference, the air at the air inlet 141 is guided through the blade air channel 14 to the air outlet 142 to be discharged, and then generates a flowing air flow inside the wind power generator by the rotation of the wind power generator itself without adding a motor , which provides a basis for applying the flowing airflow to the heat dissipation of the wind turbine cabin; by setting the anti-backflow mechanism 15, it is possible to prevent air or rainwater from entering the inside of the wind turbine blade 1 from the outside through the air outlet 142, thereby affecting the normal operation of the generator . The heat conduction component can transfer the hot air in the air channel 14 to the outer surface of the wind generator blade 1, thereby increasing the temperature of the outer surface of the wind generator blade 1, and can prevent the icing on the outer surface of the wind generator blade 1. Heating, so as to achieve the purpose of eliminating ice.

In addition, the axial distance L between the air outlet 142 and the blade root 11 may be greater than or equal to the preset distance L ₁ . The axial distance L mentioned here refers to the distance along the axis extending from the blade root 11 to the blade tip. As shown in FIG. 1 , the axis here refers to the reference axis of the wind turbine blade 1 , rather than the physical structure. The greater the axial distance L, the greater the air pressure difference formed when the wind turbine blade 1 rotates, the better the heat dissipation performance, and the more obvious the heating effect on the frozen place.

In addition, the air outlet 142 may be provided at the middle of the blade body 12 and/or at the blade tip. The blade body 12 includes a connecting part, a middle part and a blade tip; wherein, the connecting part is connected to the blade root; the blade tip is located at the end away from the blade root 11; and the middle part is located between the connecting part and the blade tip. Preferably, the air outlet 142 is arranged in the middle and/or at the blade tip, so that the axial distance L between the air outlet 142 and the blade root 11 is greater than the preset distance L ₁ , so as to form an air pressure difference that meets heat dissipation requirements.

Preferably, the air outlet 142 is arranged at the tip of the blade, which can increase the air pressure difference, enhance the fluidity of the airflow, and improve the heat exchange effect.

In addition, the anti-backflow mechanism 15 may adopt a one-way valve. But not limited to the one-way valve, any mechanism that can allow air to flow out from the air outlet but prevent air or rainwater from entering the wind turbine blade 1 from the outside through the air outlet 142 is within the scope of this embodiment.

In addition, multiple air outlets 142 may be provided. As shown in FIG. 1 , an anti-backflow mechanism 15 is provided at each air outlet 142 . By arranging multiple air outlets 142, the air flow rate can be increased and the heat exchange effect can be improved.

Preferably, multiple air inlets 141 and multiple blade air passages 14 may be provided, and each blade air passage 14 is connected to one air inlet 141 and one air outlet 142 . Alternatively, a form of setting one air inlet 141 and multiple vane air passages 14 (not shown in the figure) may also be adopted. Any structure of the air channel 14 that can guide air from the air inlet 141 to the air outlet 142 is within the limitations of this embodiment.

The wind power generator blade 1 provided by the embodiment of the utility model, by setting the blade air channel 14 inside and the air outlet 142 on the outer surface, when the wind power generator blade 1 rotates with the hub 2, the air inlet 141 and the air outlet 142 An air pressure difference is formed between them, and the airflow flowing in the air channel 14 is formed under the action of the air pressure difference, and finally discharged from the air outlet 142 . In the case of not adding a motor, the flow airflow is generated inside the wind turbine generator by the rotation of the wind turbine itself, thereby providing a basis for applying the flow airflow to the heat dissipation of the cabin. By setting the anti-backflow mechanism 15, it is possible to prevent air or rainwater from entering the inside of the blade 1 of the wind power generator from the outside through the air outlet 142, thereby affecting the normal operation of the generator.

Embodiment two

Fig. 2 and Fig. 3 show the structural diagram and principle diagram of the blade deicing device of the second embodiment.

The blade deicing device of the second embodiment includes a cabin for accommodating heating elements, a hub 2 , the wind turbine blade 1 as described in the first embodiment, and a cooling channel. Wherein, the blade 1 of the wind power generator is connected with the hub 2 ; the cooling passage connects the cabin and the air inlet 141 of the blade 1 of the wind power generator.

The cabin in this embodiment refers to the cabin that is arranged in the wind power generator and accommodates heating elements that generate heat during operation. For example, the cabin may be the inner cavity of the generator or a cabin for accommodating switch cabinets or current cabinets, etc., but it is not limited to the above cabins. Any cabin in the wind generator that needs heat dissipation is within the scope of this embodiment.

When the wind turbine is running, it is necessary to dissipate heat from the cabin and the heating elements contained therein. The working principle of the blade deicing device is described below:

When the wind turbine is in the power generation state, the formula 1 can be obtained from the Bernoulli equation:

Formula one:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;gh</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;gh</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Among them, P ₁ is the average air pressure of the cabin; V ₁ is the average flow velocity of the air in the cabin; h ₁ is the average height of the cabin; P ₂ is the average air pressure at the air outlet 142 of the wind turbine blade; V ₂ is the wind force The average flow velocity of the air at the air outlet 142 of the blade of the generator _; h2 is the average height of the air outlet 142 of the blade of the wind power generator.

Formula 2 can be obtained from formula 1:

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&rho;</span>}\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>$

Formula 3 is further obtained from formula 2:

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&rho;</span>}\mathrm{<span\; class="notranslate">\; g</span>}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; h</span>}$

In formula three: ΔP is the air pressure difference between the cabin and the air outlet 142, that is, ΔP=P ₁ -P ₂ , the unit is Pa; the air density ρ is 1.205kg/m ³ ; the gravitational acceleration g is 9.8m/s ² ; Δh is the difference between the average height of the cabin and the average height of the air outlet 142, in meters, that is, Δh=h ₂ −h ₁ .

With the rotation of the blades, the average height h ₂ of the air outlet 142 will also change, while the average height h ₁ of the cabin remains constant. Therefore, when the blade rotates, Δh changes dynamically within a fixed range. When the cabin is close to the axis of the generator shaft, Δh can be considered to roughly vary between -L and L, that is, Δh∈(-L, L), where L is the axial distance between the air outlet 142 and the blade root 11 .

The average flow velocity V ₁ of the air in the cabin can be approximately 0m/s, because the cabin is located inside the wind turbine, and the air in the cabin is basically in a static state.

The average air flow _velocity V2 at the air outlet 142 can be roughly calculated from the vector sum of the blade rotational speed _vω at the air outlet and the current wind speed _vf , see formula 4:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Wherein, v _ω is the blade rotational speed at the air outlet 142, and v _f is the current wind speed.

The vane speed v _ω at the air outlet 142 can be roughly calculated by Formula 5, see Formula 5:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; 60</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; L</span>}$

Among them, n is the impeller speed in r/min.

Combining formula 3, formula 4 and formula 5, it can be obtained that the value of the air pressure difference ΔP generally changes within the following range:

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; \&Element;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0.0066</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; no</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 0.6</span>}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 11.8</span>}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0.0066</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; no</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 0.6</span>}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 11.8</span>}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>$

It can be seen that, under the condition that the current wind speed v _{f is} constant, the air pressure difference ΔP mainly depends on the axial distance L between the air outlet 142 and the blade root 11 and the generator speed n. The greater the generator speed n, the greater the air pressure difference ΔP; the farther the axial distance L between the air outlet 142 and the blade root 11 is, the greater the air pressure difference ΔP.

When the generator speed n range is constant, the axial distance L between the air outlet 142 and the blade root 11 is greater than the preset distance L ₁ , so that ΔP is greater than or equal to the preset air pressure difference ΔP ₁ , thereby ensuring that the cabin and the outlet There is a sufficiently large air pressure difference ΔP between the air ports 142 to form a moving air flow.

When the impeller starts to rotate, while the heating element inside the cabin generates heat, according to the above calculation, the air pressure difference ΔP between the cabin and the air outlet 142 is also generated accordingly. Driven by this pressure difference, the air inside the cabin will flow to the air outlet 142 through the cooling channel and the air duct 100, and at the same time, the air from other places inside the generator or the outside air will supplement the cabin, and this convection process can make the inside of the cabin The heat dissipates to the space around the air outlet 142. During the process from fan start to full blown, with the continuous increase of wind speed and impeller speed, the calorific value of the heating element in the cabin will also increase continuously, and the air pressure difference ΔP between the cabin and the air outlet 142 will also increase accordingly , correspondingly, the heat dissipation efficiency of the heat dissipation device is also increased, and the deicing effect is also more obvious. At the same time, the greater the temperature difference between the cabin and the air outlet 142, the higher the efficiency of the deicing device.

The blade deicing device of the second embodiment connects the cabin with the air inlet 141 of the wind turbine blade 1 by setting the cooling channel. When the wind turbine blade 1 rotates with the hub 2, the air pressure in the cabin will be greater than that of the wind power generator. The air pressure from the blades of the machine will generate a moving airflow, which can take the heat in the cabin through the cooling passage and the blade air passage, and finally take it away through the air outlet 142, and at the same time introduce the cold airflow into the cabin to cool down the cabin. The blade deicing device of this embodiment effectively utilizes the rotation of the generator itself to solve the problem of cabin heat dissipation without adding motors and control devices, reduces production costs and operating energy consumption, and reduces the weight of the generator.

In addition, the blade deicing device of the embodiment of the utility model does not depend on the drive of the motor, and operates with the operation of the generator, with good reliability and low failure rate. When the generator rotates at a high speed and generates a large amount of heat, the deicing efficiency of the deicing device is correspondingly improved; when the generator stops running, the deicing device also stops running without additional control device control.

The blade deicing device of this embodiment will be further described below by taking heat dissipation and deicing in the inner cavity of the generator as an example.

Specifically, the heating element may include, for example, a generator, the compartment includes a first compartment 40 , and the first compartment 40 is an inner cavity of the generator; the cooling channel includes a first cooling channel.

Specifically, the generator includes a rotor and a stator. The inner cavity of the generator refers to the space formed by the rotor and the stator. During operation, the rotor and the stator will generate heat; the first cooling passage includes: the rotor bracket connection port 41, which runs through the rotor The bracket 4 is also in communication with the first chamber 40 ; the air duct 100 is connected to the connecting port 41 of the rotor bracket at one end, and connected to the air inlet 141 of the blade 1 of the wind power generator at the other end.

In addition, the air inlet 141 of the blade 1 of the wind power generator communicates with the inner cavity of the hub 2 through the blade installation opening on the hub 2 . Thus, the air duct 100 can be connected to the air inlet 141 inside the hub 2 .

By setting the rotor bracket connection port 41 and the air duct 100 . When the hub 2 rotates driven by the blades 1 of the wind power generator, the rotor bracket 4 and the air duct 100 rotate synchronously with the hub 2 . Since the rotor bracket connection port 41 is always in communication with the first compartment 40, when the hub 2 rotates, the air in the first compartment 40 can still enter the blade air channel 14 through the rotor bracket connection port 41 and the air duct 100, and then pass through the air outlet. 142 is discharged to take away the heat in the first compartment 40 . On the other hand, cold air flows into the first compartment 40 from the outside, thereby reducing the temperature of the first compartment 40 . Preferably, the rotor bracket connecting port 41 is arranged at the locking pin opening of the rotor bracket 4 .

In addition, the hub 2 is provided with an opening 22; one end of the air duct 100 is arranged outside the hub 2 and connected to the rotor bracket connection port 41; the other end of the air duct 100 enters the interior of the hub 2 through the opening 22, and is connected to the The air inlet 141 of the machine blade 1 is connected.

Preferably, as shown in FIG. 2 , a fixing bracket 21 is provided outside the hub 2 , and the fixing bracket 21 fixes the air duct 100 outside the hub 2 so that the air duct can rotate synchronously with the hub 2 and the rotor bracket 4 . By arranging the air ducts in this way, the first cooling channel and the blade air channel 14 can always be kept connected when the rotor rotates, ensuring smooth flow of the cooling airflow and achieving stable, reliable and continuous heat dissipation and deicing effects.

The effect of the deicing device used in the first compartment 40 will be further described below in conjunction with specific data.

The location of the first compartment 40 is generally close to the axis of the generator shaft. In this embodiment, preferably, the air outlet 142 is provided at the blade tip of the wind turbine blade 1 , and the axial distance L between the air outlet 142 and the blade root 11 is substantially equal to the length of the blade.

For example, the blade length may be 60m. The difference Δh between the average height of the cabin and the average height of the air outlet 142 varies between about (-60, 60). The air density ρ is taken as 1.205kg/m ³ , and the gravitational acceleration g is taken as 9.8m/s ² , then according to formula 3, ρgΔh∈(-709,709).

The air flow velocity V ₁ inside the first chamber 40 can be 0 m/s, and the air flow velocity V ₂ at the blade tip can be calculated by Formula 4. For example, v _f can be taken as 15m/s, and speed n can be taken as 17.3r/min. According to formula 5, v _ω can be calculated to be roughly 108.6m/s; then formula 4 can be used to calculate V ₂ to be roughly 109.6m/s.

Substituting the above data into Equation 3, it can be obtained that ΔP roughly changes in the range of 6500-7900, and its unit is Pa.

From the above data, it can be seen that when the generator rotates, a relatively large air pressure difference ΔP can be generated between the first chamber 40 and the air outlet 142, and the air inside the first chamber 40 will pass through the first chamber 40 under the action of the air pressure difference ΔP. The cooling channel and the air duct 100 flow to the air outlet 142, and at the same time, the air from other places inside the generator or the outside air will supplement the first compartment 40, and this convection process can dissipate the heat inside the first compartment 40 to the surroundings of the air outlet 142 space, to realize the heating of the icy part on the outer surface of the wind turbine blade 1, and then achieve the purpose of deicing.

Embodiment Three

Fig. 4 is a structural diagram of the blade deicing device according to the third embodiment of the present invention. The difference between the blade de-icing device in the third embodiment and the embodiment in the second embodiment which dissipates heat for the first compartment 40 is that the blade de-icing device in the third embodiment can dissipate heat in the second compartment 50 which is different from the first compartment 40 . The second compartment 50 may be a compartment for accommodating a converter or a main control switchgear, but is not limited to the above-mentioned compartments, and may also be other compartments different from the first compartment 40 and requiring heat dissipation.

Specifically, the difference between the second compartment 50 and the first compartment 40 is that the first compartment 40 is the inner chamber of the generator, and the first compartment 40 is always connected with the second compartment 40 through the rotor bracket connection port 41 when the generator rotor rotates. A cooling passage, the blade air passage 14 and the blade air outlet 142 remain in communication; while the second compartment located in other positions of the generator cannot directly communicate with the blade air in the wind turbine blade 1 that rotates with the rotor through a conventional connecting pipeline. The channel 14 is connected, otherwise the connecting pipeline will be blocked or damaged because one end of the connecting pipeline is fixedly connected to the second compartment 50 and the other end rotates together with the wind turbine blade 1 torsion, and a reliable connection cannot be realized.

For this reason, the wind turbine cooling device of the third embodiment solves the problem of the connection between the second compartment 50 and the blade air channel 14 of the wind turbine blade 1 through the following structure.

Specifically, the heating element includes a converter or a main control switchgear (not shown in the figure), the compartment of the wind turbine cooling device includes a second compartment 50 for accommodating the converter or a main control switchgear, and the cooling channel includes Second cooling channel.

Specifically, the second cooling channel includes: a transfer mechanism 5, which includes a first interface and a second interface, and a rotatable and sealed connection between the first interface and the second interface; a first connecting pipe 200, connected to the second compartment 50 and the first interface of the transition mechanism 5 ; the second connecting pipe 300 connects the second interface of the transition mechanism 5 and the air inlet 141 of the wind turbine blade 1 .

In this embodiment, by setting the switching mechanism 5 , the communication between the second compartment 50 and the blade air channel 14 on the rotating blade 1 of the wind power generator can be realized. Due to the relatively rotatable sealed connection between the first interface and the second interface, in actual work, the first interface, the first connecting pipe 200 and the second compartment 50 are relatively fixedly connected, and the second interface, the second connecting pipe 300 It rotates together with the wind turbine blade 1, thereby solving the problem of the torsion of the connecting pipeline, so that when the rotor rotates, the second cooling channel and the blade air channel 14 are also kept unblocked, thereby achieving continuous stability and reliability of the second cabin. heat dissipation. The transfer mechanism 5 can adopt any method well known in the art, as long as the rotation and sealing connection between the first interface and the second interface can be realized, all are within the limitation scope of this embodiment.

In this embodiment, the heat dissipation of the first compartment 40 and the second compartment 50 can be further combined to realize the heat dissipation of the generator, the converter and the main control switch cabinet at the same time. The first cooling channel and the second cooling channel are set in the blade deicing device at the same time, and both the first cooling channel and the second cooling channel are connected with the blade air channel 14, and the first cabin is realized simultaneously when the wind turbine blade 1 rotates. The heat dissipation of the 40 and the second compartment 50 transfers heat to the outer surface of the wind turbine blade 1 .

Embodiment four

Embodiment 4 of the present utility model provides a wind power generating set, which includes the blade deicing device in Embodiment 2 or Embodiment 3. By adopting the aforementioned blade deicing device, the wind power generating set of this embodiment can rely on the rotation of its own blades to dissipate heat for the cabin with heating elements, without additional cooling motors, which reduces the production cost and weight of the wind generating set At the same time, the reliability of the deicing system is also improved, and the heat is transferred to the surface of the blade 1 of the wind power generator to achieve the effect of deicing the outer surface of the blade 1 of the wind power generator.

The blade of the wind power generator provided by the embodiment of the utility model is provided with an air channel inside the blade and an air outlet on the outer surface. When the blade of the wind power generator rotates with the hub, a pressure difference is formed between the air inlet and the air outlet. The air at the air inlet is led to the air outlet through the blade air passage under the influence of the bad effect; by setting the anti-backflow device, it can prevent air or rainwater from entering the inside of the blade from the outside and affecting the normal operation of the generator.

The blade deicing device provided by the embodiment of the utility model connects the cabin containing the heating element with the air inlet of the wind turbine blade by setting a cooling channel. When the wind turbine blade rotates with the hub, the air pressure in the cabin It will be greater than the air pressure from the blades of the wind turbine, and then a moving airflow will be generated. The airflow can pass the heat in the cabin through the cooling channel and the air channel of the blade, and finally take it away through the air outlet. Cool down. The blade deicing device of this embodiment effectively uses the rotation of the generator itself to solve the problem of heat dissipation in the cabin without adding motors and control devices. Heating solves the problem of icing on the surface of the blade 1 of the wind power generator, reduces production costs and energy consumption, and reduces the weight of the generator.

The wind power generating set of the embodiment of the utility model does not need to add a cooling motor, has low cost, light weight, high reliability, and can automatically adjust the flow rate of the cooling air flow with the increase of the generator speed, and has good heat dissipation performance, and the excess heat can be used for cooling Heating at the frozen place avoids the occurrence of changes in the airfoil of the blade 1 of the wind power generator, the increase in the mass of the impeller, the increase in the unbalance degree of the impeller, and the increase in the load of the fan.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (12)

1. a blade of wind-driven generator, including blade root (11) and blade body (12)；It is characterized in that, also include:

Air inlet (141), is arranged on described blade root (11) place；Gas outlet (142), is arranged on described blade body (12) outer surface Place；

Air duct (14), is arranged on blade of wind-driven generator (1) inside and connects described air inlet (141) and gas outlet (142)；

Anti-reflux mechanism (15), is arranged on described gas outlet (142) place；

Conducting-heat elements, connects described air duct (14) and the outer surface of described blade of wind-driven generator (1).

Blade of wind-driven generator the most according to claim 1, it is characterised in that described conducting-heat elements includes endothermic section, biography Leading portion and radiating part, described endothermic section is arranged on inwall and/or the outer wall of described air duct (14)；Described radiating part is arranged On the outer surface of described blade of wind-driven generator (1) and/or the inside of outer surface of described blade of wind-driven generator (1)；Institute State conducting part and connect described endothermic section and described radiating part.

Blade of wind-driven generator the most according to claim 1, it is characterised in that described blade of wind-driven generator (1) is internal Being additionally provided with support, described air duct (14) is fixedly connected on the interior of described blade of wind-driven generator (1) by described support Surface.

Blade of wind-driven generator the most according to claim 1, it is characterised in that described conducting-heat elements uses heat-conducting metal system Become.

Blade of wind-driven generator the most according to claim 1, it is characterised in that described anti-reflux mechanism (15) is unidirectional Valve.

6. a blade de-icing device, including the cabin and the wheel hub (2) that accommodate heater element, it is characterised in that also include:

Blade of wind-driven generator (1) as according to any one of claim 1-5, is connected with described wheel hub (2)；

Heat transfer path, connects the described air inlet (141) of described cabin and described blade of wind-driven generator (1).

Blade de-icing device the most according to claim 6, it is characterised in that

Described heater element includes electromotor；

Described cabin includes that the first cabin, described first cabin are the inner chambers of described electromotor；

Described heat transfer path includes the first heat transfer path；

Described first heat transfer path includes:

Rotor field spider connector (41), it runs through rotor field spider (4) and connects with described first cabin；

Air conduit (100), its one end connects described rotor field spider connector (41), and the other end connects described air inlet (141).

Blade de-icing device the most according to claim 7, it is characterised in that described wheel hub (2) is provided with opening (22)；Institute The one end stating air conduit (100) is arranged on the outside of described wheel hub (2), and is connected with described rotor field spider connector (41) Connect；It is internal that the other end of described air conduit (100) enters described wheel hub (2) by described opening (22), and with described wind-force The described air inlet (141) of generator blade (1) is connected.

Blade de-icing device the most according to claim 7, it is characterised in that the outside of described air conduit (100) is arranged There is heat-insulation layer.

Blade de-icing device the most according to claim 6, it is characterised in that

Described heater element includes current transformer or master switch cabinet；

Described cabin includes the second cabin for accommodating current transformer or master switch cabinet；

Described heat transfer path includes the second heat transfer path；

Described second heat transfer path includes:

Changeover mechanism (5), it includes first interface and the second interface, rotatable between described first interface and described second interface Be tightly connected；

First connecting tube (200), connects described second cabin and the described first interface of described changeover mechanism (5)；

Second connecting tube (300), connects described second interface and the described blade of wind-driven generator (1) of described changeover mechanism (5) Described air inlet (141).

11. blade de-icing devices according to claim 7, it is characterised in that

Described heater element also includes current transformer or master switch cabinet；

Described cabin also includes the second cabin for accommodating current transformer or master switch cabinet；

Described heat transfer path also includes the second heat transfer path；

Described second heat transfer path includes:

Changeover mechanism (5), it includes first interface and the second interface, can be relative between described first interface and described second interface Rotate is tightly connected；

First connecting tube (200), connects described second cabin and the described first interface of described changeover mechanism (5)；

Second connecting tube (300), connects described second interface and the described blade of wind-driven generator (1) of described changeover mechanism (5) Described air inlet (141).

12. 1 kinds of wind power generating set, it is characterised in that include the blade deicing dress as according to any one of claim 6-11 Put.