CN111188741A

CN111188741A - Blade deicing heater

Info

Publication number: CN111188741A
Application number: CN201911251558.6A
Authority: CN
Inventors: 宋小红; 曾敏敏
Original assignee: Suzhou Simante Automation Technology Co Ltd
Current assignee: Suzhou Simante Automation Technology Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-05-22

Abstract

The invention discloses a blade deicing heater, which comprises a heater body, wherein the heater body comprises a shell, a mounting bracket and a heating element, the heating element comprises a heating body and an insulator, the heating body is made of positive temperature coefficient thermistors, each heating body is provided with a plurality of heat dissipation holes, the plurality of heating bodies are fixed on the insulator, the heat dissipation holes of the heating bodies arranged on the same insulator form a windward side, the windward side is fixedly arranged on the shell through the mounting bracket, a plurality of windward sides are arranged in the shell and are parallel to each other, and wind flow generated by a fan is heated through the plurality of windward sides so that the heater body discharges hot wind. The heating body is made of a positive temperature coefficient thermistor, when the air supply condition is damaged, the heat of the heating body cannot be carried out, high temperature can be generated in the box body, the heating body is dried, the working current of the heater can quickly drop due to the characteristics of the PTC element, the working current of the heating body drops, the surface temperature cannot rise any more, and the purpose of controlling the temperature is achieved.

Description

Blade deicing heater

Technical Field

The invention relates to a wind generating set, in particular to a blade deicing heater of the wind generating set.

Background

The damage of the ice on the wind power generation blade becomes a very important negative factor which influences the generating efficiency of the wind generating set and the service life of the wind generating set.

At present, the blade deicing heating modes used at home and abroad are as follows: the heating and silicon carbide heating composed of resistance wires have the defects of poor vibration resistance, large volume and weight and uncontrollable heat, when air supply fails, a large amount of heat cannot be emitted in a heater box, the temperature of a heating body rises to above 600 ℃, and because the material of the inner cavity of the blade is a plastic grease and other sealed environments, the material of the inner cavity of the blade is damaged at higher temperature, so that great potential safety hazards are brought.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the blade deicing PTC heater with controllable heat under the condition of high voltage, so that the potential safety hazard is reduced.

One of the purposes of the invention is realized by adopting the following technical scheme:

the utility model provides a blade deicing heater, includes the heater main part, the heater main part includes casing, installing support and heating element, heating element includes heat-generating body and insulator, the heat-generating body is made by positive temperature coefficient thermistor, each the heat-generating body is equipped with a plurality of louvres, and a plurality of heat-generating bodies are fixed in the insulator sets up in same the louvre of heat-generating body on the insulator forms a windward side, the windward side passes through installing support fixed mounting in the casing, be equipped with a plurality ofly in the casing the windward side is, and is a plurality of the windward side is parallel to each other, and the distinguished and admirable process that the fan produced is a plurality of the windward side heats, makes the heater main part.

Further, the number of windward sides is less than five.

Furthermore, the aperture of the heat dissipation hole is 3mm-3.4 mm.

Further, the windward side is rectangular.

Further, a gap is formed between the adjacent heating bodies, and the gap is 5 mm.

Furthermore, ventilation channels are formed between the two sides of the windward side and the shell respectively.

Further, the width of the ventilation channel is 10 mm.

Further, the blade deicing heater further comprises a fan and a front air guide cover, the front air guide cover is provided with an air inlet, the air inlet is rectangular, the air inlet of the front air guide cover is communicated with the fan, and the other end of the front air guide cover is communicated with the inside of the shell.

Further, the blade deicing heater further comprises a rear air guide cover, the rear air guide cover is provided with an air outlet, the air outlet is circular, and the rear air guide cover is communicated with the inside of the shell.

Further, the wind pressure loss of the heater main body is 150Pa or less.

Compared with the prior art, the invention has the beneficial effects that:

(1) the heating body of the blade deicing heater is made of a positive temperature coefficient thermistor (PTC element), when the air supply condition is damaged, the heat of the heating body cannot be carried out, the box body can generate high temperature of 270 ℃, the heating body is subjected to dry burning, the working current of the heater can be quickly reduced to hundreds of milliamperes due to the characteristics of the PTC element, the working current of the heating body is reduced, the surface temperature of the heating body cannot be increased, and the purpose of controlling the temperature is achieved.

(2) The arrangement mode of the heating bodies of the blade deicing heater and the design of the windward side ensure that the internal pressure loss is less than or equal to 150Pa, the generated heating effect is better, the heater shell does not generate heat, and the potential safety hazard is avoided

Drawings

FIG. 1 is a schematic view of a blade de-icing heater according to the present invention;

FIG. 2 is a cross-sectional view of the blade de-icing heater of FIG. 1;

FIG. 3 is a schematic diagram of a heat generator of the blade de-icing heater of FIG. 1;

FIG. 4 is a schematic illustration of the structure of the windward side of the blade de-icing heater of FIG. 1;

FIG. 5 is a front view of a front cowl of the blade de-icing heater of FIG. 1;

FIG. 6 is a front view of the rear wind scooper of the blade de-icing heater of FIG. 1;

FIG. 7 is a no wind speed power operating curve for the blade de-icing heater of FIG. 1.

In the figure: 10. a fan; 20. a front air guide cover; 21. an air inlet; 30. a heater main body; 31. a housing; 32. a heating element; 320. a heating element; 321. an insulator; 33. mounting a bracket; 34. a power connection; 35. a ventilation channel; 36. the windward side; 40. a rear wind scooper; 41. and (7) air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, the blade deicing heater of the present invention is installed in the blade cavity of the wind turbine generator, and is used to increase the temperature of the blade cavity, and heat exchange between the inside and the outside is realized after the temperature of the blade cavity is raised to a certain value, so as to deice the surface of the blade.

The blade deicing heater includes a fan 10, a front wind cowl 20, a heater main body 30, and a rear wind cowl 40.

The front cowl 20 is tapered. The front air guide cover 20 is provided with an air inlet 21, and the air inlet 21 is rectangular. The front air guide housing 20 is communicated with the fan 10 through an air inlet 21.

The heater main body 30 includes a case 31, a heating element 32, a mounting bracket 33, and a power connector 34. The heating element 32 includes a heating element 320 and an insulator 321. The heating element 320 is made of a positive temperature coefficient thermistor (PTC element), when the air supply condition is broken, the heat of the heating element 320 cannot be carried out, a high temperature of 270 ℃ can be generated in the shell 31, at the moment, the heating element 320 is dried, the working current of the heater main body 30 can be quickly reduced to hundreds of milliamperes due to the characteristics of the PTC element, the working current of the heating element 320 is reduced, the surface temperature of the heating element cannot be increased, and the purpose of controlling the temperature is achieved (see fig. 7).

The power of the single heating element 320 is 1KW, the voltage level is 400-690 VAC, and the temperature of the body is controlled at 250 ℃. The heating element 320 is provided with heat dissipation holes with the aperture of 3mm-3.4 mm. The upper and lower ends of the plurality of heating elements 320 are mounted on the insulator 321 and arranged in a row, and a gap is formed between two adjacent heating elements 320, and the width of the gap is 5 mm. The clearance can reduce the wind resistance inside the heater main body 30, and reduce the pressure loss.

The heat dissipation holes on the row of heating elements 320 form the windward side 36. The airflow flows through the windward side 36 and takes away heat from the heating element 320, so that the heating element 320 is cooled, the temperature of the airflow is raised, and pressure loss is also generated. The row of heating elements 320 is fixedly attached to the case 31 by the mounting bracket 33. At this time, the ventilation channel 35 is formed between both sides of the windward side 36 and the housing 31, the width of the ventilation channel 35 is 10mm, and the ventilation channel 35 can reduce the wind resistance inside the heater main body 30, reduce the pressure loss, and prevent the housing 31 from generating heat.

The wind front 36 is designed as a rectangle, preferably as a square. Theoretically, the ventilation body with the circular structure has the minimum wind resistance and pressure loss, and the heating body 320 is long in the middle and short on two sides when arranged inside and doubled in processing difficulty due to the circular structure, and can generate three-phase imbalance when three-phase power is formed, so that the influence on the wind generating set is caused during operation. The design area is 240 × 240mm, the PTC heating elements 320 are ensured to be equally ventilated in the box, the three-phase power and current balance of an electric loop formed by the heating elements 320 in the box are ensured, and meanwhile the pressure loss of the heater main body 30 is less than or equal to 150 Pa.

The number of layers of the windward side 36 in the case 31 is not more than 5, so that it is prevented that the internal wind resistance is too large and the pressure loss is increased as the installation of the heating elements 320 becomes denser. The power connector 34 is fixed to the case 31 and electrically connected to the heating element 320 to supply power to the heating element 320.

The rear wind scooper 40 is tapered. The rear wind scooper 40 is provided with a wind outlet 41, and the wind outlet 41 is circular. The rear wind scooper 40 is fixed to one side of the casing 31 and communicates with the inside of the casing 31.

The heating element 320 generates heat after receiving electricity, under the action of the fan 10, airflow enters the heater main body 30 through the front air guide cover 20, flows through the windward side 36 and takes away the heat on the heating element 320, so that the heating element 320 is cooled, the temperature of the airflow rises, the airflow flows into the blade inner cavity through the rear air guide cover 40, the heat is taken to the blade tip part, the inner cavity is heated to a certain value to realize internal and external heat exchange, and the surface of the blade is deiced.

Through the structural design of the shell 31, the heating body 320, the wind resistance and the like of the heater main body 30, the power of the blade deicing heater is 20-40 KW, the surface temperature of the shell 31 is less than or equal to 60 ℃ during operation, the wind pressure loss is less than or equal to 150Pa, the acceleration effect below 5g is met, the miniaturization of the equipment heater (40Kg) in blade deicing is realized, the miniaturization of a fan (34Kg) is realized, the field installation of a deicing system is facilitated, and the adaptability of a product is improved.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims

1. A blade deicing heater, comprising a heater body, characterized in that: the heater main part includes casing, installing support and heating element, heating element includes heat-generating body and insulator, the heat-generating body is made by positive temperature coefficient thermistor, each the heat-generating body is equipped with a plurality of louvres, and a plurality of heat-generating bodies are fixed in the insulator sets up in same the louvre of heat-generating body on the insulator forms a windward side, the windward side passes through installing support fixed mounting in the casing, be equipped with in the casing a plurality of windward side, a plurality of windward side is parallel to each other, and the distinguished and admirable process that the fan produced is a plurality of the windward side heats, makes heater main part exhaust hot-blast.

2. The blade deicing heater of claim 1 wherein: the number of the windward sides is less than five.

3. The blade deicing heater of claim 1 wherein: the aperture of the heat dissipation hole is 3mm-3.4 mm.

4. The blade deicing heater of claim 1 wherein: the windward side is rectangular.

5. The blade deicing heater of claim 1 wherein: and a gap is formed between every two adjacent heating bodies, and the gap is 5 mm.

6. The blade deicing heater of claim 1 wherein: and ventilation channels are respectively formed between the two sides of the windward side and the shell.

7. The blade deicing heater of claim 6, wherein: the width of the ventilation channel is 10 mm.

8. The blade deicing heater of claim 1 wherein: the blade deicing heater further comprises a fan and a front air guide cover, the front air guide cover is provided with an air inlet, the air inlet is rectangular, the air inlet of the front air guide cover is communicated with the fan, and the other end of the front air guide cover is communicated with the inside of the shell.

9. The blade deicing heater of claim 1 wherein: the blade deicing heater further comprises a rear air guide cover, the rear air guide cover is provided with an air outlet, the air outlet is circular, and the rear air guide cover is communicated with the inside of the shell.

10. The blade deicing heater of claim 1 wherein: the wind pressure loss of the heater main body is less than or equal to 150 Pa.