Self-heating type wind turbine hollow main shaft

Abstract

The utility model relates to wind driven generator technical field, specifically disclose a kind of self-heating type wind driven generator set hollow main shaft, including the hollow shaft body with central hole, several groups of flexible heating film being sequentially arranged in the central hole and along the central hole axial, and the power supply connected with several groups of flexible heating film. The utility model is arranged in the central hole of hollow shaft body flexible heating film, by its connection with power supply, the heating for the hollow shaft body is realized, ensure that even if the hollow shaft body is made of non-low-temperature material, it can also normally operate in extremely low temperature environment, and low-temperature brittle fracture will not occur.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind driven generator technical field more particularly, relate to a self heating type wind driven generator set hollow main shaft. BACKGROUND

[0002] Generally wind driven generator set runs in various complex environmental conditions, has high temperature environment, also has low temperature environment.

[0003] When wind driven generator set runs in extremely low environmental temperature, each spare part must be able to normally and reliably run, can guarantee that unit can normally run, to metal material proposes higher requirement.

[0004] Metal material includes normal temperature material and low temperature material, and they have different low temperature impact work, for example, the carbon steel material of Q235-B, and it has the low temperature impact work value required by standard GB / T 229-2007 above 20 DEG C, when at-20 DEG C or lower temperature, low temperature impact work is lower, under the action of the same impact load, metal material is easy to brittle fracture phenomenon under low temperature environment.The main shaft of wind driven generator set is the only component of transmitting the torque and bending moment load of wind wheel, and it bears very huge load, and is usually selected by QT400 or QT500 cast iron casting, and QT500 has higher ultimate strength, but it has relatively small low temperature impact work.When selecting QT500 material, it is required to ensure that it can not work in extremely low temperature state, and it can only bear corresponding load under higher temperature state, otherwise the unit can have the problem of shaft breakage. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that provides a self heating type wind driven generator set hollow main shaft;

[0006] The utility model solves the technical problem and adopts the following solutions:

[0007] A self heating type wind driven generator set hollow main shaft, including the hollow shaft body with the center hole, a plurality of groups of flexible heating films that are sequentially arranged in the center hole and along the center hole axial direction and the power that is connected with a plurality of groups of flexible heating films.

[0008] By installing flexible heating film in the center hole of hollow shaft body, when temperature is lower, the power is opened to make flexible heating film heat hollow shaft body, when temperature exceeds certain setting value, the power is closed, and flexible heating film stops heating, so that the hollow main shaft has or the whole operation under the temperature range state designed to ensure the normal operation of hollow main shaft.

[0009] In some possible implementation manners, in order to effectively realize real-time monitoring of the temperature of the hollow shaft body and realize automatic heating, a temperature testing assembly is further arranged on the hollow shaft body, and a control module is connected with the temperature testing assembly and the power supply respectively.

[0010] In some possible implementation manners, in order to effectively realize installation of the temperature testing assembly, a mounting hole is arranged on the hollow shaft body, the temperature testing assembly is located in the mounting hole, and heat-conducting silicone grease is arranged between the mounting hole and the temperature testing assembly.

[0011] In some possible implementation manners, in order to effectively realize fixation of the flexible heating film and enable the flexible heating film to effectively and uniformly realize heat transfer, a pressing plate is further arranged on a side of each group of flexible heating films away from the hollow shaft body and cooperates with an inner side of the hollow shaft body to realize compression fixation of the flexible heating film.

[0012] In some possible implementation manners, the pressing plate has a length along an axial direction of the hollow shaft body greater than a length of the flexible heating film, the pressing plate comprises a plurality of plate bodies having an arc-shaped structure and elasticity, and the plurality of plate bodies are arranged on an inner side of the flexible heating film and cooperatively form a circular ring columnar structure.

[0013] In some possible implementation manners, the pressing plate forms a ring-shaped cavity between two ends of the hollow shaft body and the hollow shaft body, and structural glue is arranged in the ring-shaped cavity.

[0014] In some possible implementation manners, a center of the flexible heating film and a center of the pressing plate are on the same straight line, and the straight line is perpendicular to an axis of the hollow shaft body.

[0015] In some possible implementation manners, a cross section of the plate body along an axial direction of the hollow shaft body has a U-shaped structure, the U-shaped structure comprises a main plate forming a mounting cavity with an inner side wall of the center hole, end plates respectively connected with two ends of the main plate along the axial direction of the hollow shaft body and forming the U-shaped structure, and an opening of the U-shaped structure is arranged on a side close to the hollow shaft body, the flexible heating film is located in the mounting cavity, and the end plates and the inner side wall of the center hole form a ring-shaped cavity.

[0016] In some possible implementation manners, a heat-conducting silicone grease layer is arranged between the flexible heating film and the inner side wall of the center hole.

[0017] In some possible implementation manners, the flexible heating film is a silicone PTC heating film.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The utility model discloses a flexible heating film is arranged in the center hole of hollow shaft body, through its connection with power supply, realizes the heating for hollow shaft body, ensures that even if the hollow shaft body is made of non-low temperature material, can also normally run under extremely low temperature environment, and low temperature brittle fracture will not occur, thereby ensuring that the wind turbine generator unit can also normally run under low temperature environment.

[0020] The utility model discloses a temperature test subassembly, control module, power, flexible heating film are set up, can realize according to temperature demand and heat hollow shaft body automatically, has realized automatic heating.

[0021] The utility model discloses the setting of pressing plate can effectively guarantee the close adhesion of flexible heating film and hollow shaft body, thereby having good heat conduction performance.

[0022] The utility model discloses simple structure, the practicality is strong. ACCURACY OF DRAWINGS

[0023] Fig. 1 It is internal structure schematic diagram of the utility model;

[0024] Fig. 2 It is local amplification schematic diagram of the utility model;

[0025] Fig. 3 It is three -dimensional structure schematic diagram of the utility model;

[0026] 1, hollow shaft body;11, heat-conducting silicone grease layer;12, flexible heating film;13, pressing plate;131, board body;1311, mainboard;1312, end plate;14, temperature test subassembly;15, heat-conducting silicone grease;16, steel structure glue. DETAILED DESCRIPTION

[0027] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be direct connection, also can pass through the indirect connection of intermediate medium, can be the communication of two element internals or the interaction of two element.The "first", "second" and similar words mentioned in the application do not indicate any order, quantity or importance, but only distinguish different components.Similarly, "one" or "a" and similar words do not indicate quantity limit, but indicate that there is at least one.In the implementation of the application, the association relationship of the associated object is described, which indicates that there can be three kinds of relationships, for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.In the description of the embodiments of the application, unless otherwise specified, the meaning of "a plurality of" is two or more than two.For example, a plurality of positioning columns refers to two or more than two positioning columns.The specific meaning of the above terms in the utility model can be understood according to the specific situation for ordinary skilled in the art.

[0028] The utility model will be explained in detail below.

[0029] As Figs. 1-3 Indicated:

[0030] A self-heating type wind turbine hollow main shaft, including the hollow shaft body 1 with the center hole, a plurality of groups of flexible heating film 12 that are sequentially arranged in the center hole and along the center hole axial, and the power supply connected with a plurality of groups of flexible heating film 12;Flexible heating film 12 is sleeved in the center hole and is coaxially arranged with the center hole, and flexible heating film 12 will be closely combined with the inner side of the center hole;

[0031] The utility model discloses a flexible heating film 12 is installed on the inner side wall of the center hole of hollow shaft body 1, when the temperature is lower, the power is opened to make flexible heating film 12 heat hollow shaft body 1;When the temperature exceeds certain set value, the power is closed, and flexible heating film 12 stops heating, so that the hollow main shaft is designed to ensure the normal operation of the hollow main shaft in the temperature range state of the whole operation;Flexible heating film 12 is directly contacted with hollow shaft body 1, and it is set as multiple groups according to the length of hollow shaft body, so that the heat transfer efficiency is high.

[0032] Further, the heat-conducting silicone grease layer 11 is arranged between the flexible heating film 12 and the inner side wall of the center hole,

[0033] Specifically, before the flexible heating film 12 is installed, the installation position is turned to make the inner wall of the center hole flat, and then the heat-conducting silicone grease is applied to the installation position to form a heat-conducting silicone grease layer 11, and then the flexible heating film 12 is installed. The heat-conducting silicone grease layer 11 can effectively enhance the heat transfer performance between the flexible heating film 12 and the hollow shaft body 1.

[0034] In some possible embodiments, in order to effectively realize real-time monitoring of the temperature of the hollow shaft body 1 and realize automatic heating, a temperature testing assembly 14 is further arranged on the hollow shaft body 1, and a control module is connected with the temperature testing assembly 14 and the power supply respectively.

[0035] Specifically, the temperature testing assembly 14 monitors the temperature of the hollow shaft body 1 in real time and transmits the temperature information to the control module. The control module judges the temperature information. When the temperature is lower than a certain set value, the control module controls the power supply to be turned on, and the flexible heating film 12 starts the heating function. When the temperature exceeds a certain set value, the power supply is turned off, and the flexible heating film 12 stops heating.

[0036] In some possible embodiments, in order to effectively realize installation of the temperature testing assembly 14, a mounting hole is arranged on the hollow shaft body 1, the temperature testing assembly 14 is located in the mounting hole, and heat-conducting silicone grease is arranged between the mounting hole and the temperature testing assembly 14.

[0037] Specifically, the temperature testing assembly 14 is a temperature sensor with a probe, the probe is inserted into the mounting hole, and heat-conducting silicone grease is filled between the outer side of the probe and the mounting hole. The heat-conducting silicone grease can not only ensure installation of the temperature testing assembly 14, but also transmit the heat of the main shaft to the probe to realize temperature monitoring.

[0038] In some possible embodiments, in order to effectively fix the flexible heating film 12 and make the flexible heating film 12 effectively and uniformly transmit heat, a pressing plate 13 is further arranged on a side of each group of flexible heating films 12 away from the hollow shaft body 1 and cooperates with the inner side of the hollow shaft body 1 to fix the flexible heating film 12.

[0039] Further, the length of the pressing plate 13 along the axial direction of the hollow shaft body 1 is greater than the length of the flexible heating film 12.

[0040] After the flexible heating film 12 is installed, the pressing plate 13 is installed in the cylindrical cavity formed by the flexible heating film 12, and the length of the pressing plate 13 along the axial direction of the hollow shaft body 1 is greater than the length of the flexible heating film 12, so that the entire flexible heating film 12 is pressed.

[0041] In some possible implementation manners, the pressing plate 13 forms annular cavities between the two ends of the hollow shaft body 1 and the hollow shaft body 1, and structural glue is arranged in the annular cavities; the two ends of the flexible heating film 12 are blocked by the structural glue, heat loss is avoided, and the pressing plate 13 can be effectively fixed, so that the pressing plate 13 is firmly connected with the hollow shaft body 1.

[0042] In some possible implementation manners, the center of the flexible heating film 12 and the center of the pressing plate 13 are on the same straight line, and the straight line is perpendicular to the axis of the hollow shaft body 1; so that the two ends of the pressing plate 13 form annular cavities with the hollow shaft body 1.

[0043] In some possible implementation manners, the pressing plate 13 comprises a plurality of groups of plate bodies 131 which are arc-shaped in cross section and have elasticity; the plurality of groups of plate bodies 131 are arranged on the inner side of the flexible heating film 12 and cooperatively form a circular ring column structure; and the plurality of groups of plate bodies 131 are arranged along the circumference of the central hole.

[0044] Preferably, the plate bodies 131 are six groups.

[0045] The arc-shaped and elastic plate bodies 131 are installed in the cylindrical cavity formed by the flexible heating film 12 after deformation, and will restore to the initial state under no external force, and then apply an elastic force to the flexible heating film 12, so that the flexible heating film 12 is tightly attached to the inner side wall of the central hole, thereby making the flexible heating film 12 have good heat conduction performance with the hollow shaft body 1.

[0046] Further, the plate body 131 is U-shaped in cross section along the axis of the hollow shaft body 1, comprises a main plate 1311 which forms an installation cavity with the inner side wall of the central hole, and end plates 1312 which are respectively connected with the two ends of the main plate 1311 along the axis of the hollow shaft body 1 and form a U-shaped structure, the opening of the U-shaped structure is arranged on the side close to the hollow shaft body 1; the flexible heating film 12 is located in the installation cavity; the end plates 1312 form annular cavities with the inner side wall of the central hole; the annular cavities are filled with structural glue, and the structural glue is steel structural glue 16.

[0047] In some possible implementation manners, the flexible heating film 12 is a silica gel PTC heating film, which has higher safety, and is convenient to install, disassemble and maintain.

[0048] The utility model is not limited to the foregoing specific embodiments. The utility model extends to any new feature or any new combination disclosed in the specification, and any new method or process step or any new combination disclosed.

Claims

1. A self-heating type wind turbine generator system hollow main shaft, characterized by, The hollow shaft body with a central hole, a plurality of groups of flexible heating films which are sleeved in the central hole and arranged axially in sequence, a power supply connected with the plurality of groups of flexible heating films, and a pressing plate installed on the side of each group of flexible heating films away from the hollow shaft body and matched with the inner side of the hollow shaft body to realize compression and fixation of the flexible heating film, and the pressing plate and the hollow shaft body form an installation cavity for installing the flexible heating film; The length of the pressing plate in the axial direction of the hollow shaft body is greater than the length of the flexible heating film; the pressing plate comprises a plurality of groups of plate bodies which are arc-shaped in cross section and have elasticity; the plurality of groups of plate bodies are installed on the inner side of the flexible heating film and cooperatively form a circular ring columnar structure; The plate body is U-shaped in cross section in the axial direction of the hollow shaft body, comprising a main plate which forms the installation cavity together with the inner side wall of the central hole, and end plates which are respectively connected with the main plate at both ends of the hollow shaft body in the axial direction and form the U-shaped structure, and the opening of the U-shaped structure is arranged on the side close to the hollow shaft body; the flexible heating film is located in the installation cavity; the end plates and the inner side wall of the central hole form a ring cavity.

2. A self-heating type wind turbine main shaft according to claim 1, wherein Further comprising a temperature testing assembly installed on the hollow shaft body, and a control module connected with the temperature testing assembly and the power supply respectively.

3. A self-heating type wind turbine main shaft according to claim 2, wherein The hollow shaft body is provided with a mounting hole, the temperature testing assembly is located in the mounting hole, and heat-conducting silicone grease is arranged between the mounting hole and the temperature testing assembly.

4. The self-heating type wind turbine generator system hollow main shaft according to claim 1, characterized in that, The pressing plate and the hollow shaft body form a ring cavity between the two ends of the pressing plate and the hollow shaft body, and structural glue is arranged in the ring cavity.

5. A self-heating type wind turbine main shaft according to claim 4, wherein The center of the flexible heating film and the center of the pressing plate are on the same straight line, and the straight line is perpendicular to the axis of the hollow shaft body.

6. A self-heating type wind turbine main shaft according to any one of claims 1 to 5, characterized in that, Heat-conducting silicone grease is arranged between the flexible heating film and the inner side wall of the central hole.

7. A self-heating type wind turbine main shaft according to claim 6, wherein The flexible heating film is a silica gel PTC heating film.

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