Gearbox oil temperature control system, control method and wind turbine generator system

Abstract

The application provides a kind of gearbox oil temperature control system, control method and wind turbine unit, gearbox oil temperature control system includes temperature sensor, heater, controller, temperature sensor is set to gear box, the temperature measuring part of temperature sensor is located in gear box, temperature sensor is used to detect the lubricating oil temperature in gear box;Heater is set to gear box, heater is used to heat gear box;Controller is used to control heater to heat gear box according to the oil temperature detected by temperature sensor.The gearbox oil temperature control system of the application detects the lubricating oil temperature in gear box in real time through temperature sensor, the controller can control heater to heat gear box according to the oil temperature detected by temperature sensor, realize the accurate regulation and control of lubricating oil temperature, effectively reduce the damping generated by viscosity increase of lubricating oil in low temperature environment, improve the starting performance and working reliability of gear box in low temperature working condition.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, and in particular to a gearbox oil temperature control system, control method, and wind turbine generator set. Background Technology

[0002] Planetary gearboxes are widely used in industrial planetary drives, wind turbine yaw and pitch drives, and other fields. Under extreme low-temperature conditions, the viscosity of the gearbox lubricating oil increases dramatically, significantly increasing damping, leading to difficulties in equipment startup, reduced transmission efficiency, and even component damage. Existing low-temperature adaptation solutions are insufficient, making it difficult to adjust heating in real time according to oil temperature, and cannot reliably ensure stable gearbox operation in extremely cold environments, thus restricting the normal use of equipment in low-temperature scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide a gearbox oil temperature control system, control method, and wind turbine generator set, aiming to solve the problem that existing gearboxes are difficult to start under low-temperature conditions due to excessive lubricating oil damping.

[0004] To solve the above-mentioned technical problems, embodiments of the present invention provide a gearbox oil temperature control system, comprising: A temperature sensor is provided, wherein the temperature sensor is disposed in the gearbox, the temperature measuring part of the temperature sensor is located inside the gearbox, and the temperature sensor is used to detect the temperature of the lubricating oil inside the gearbox; A heater, disposed in the gearbox, is used to heat the gearbox; A controller electrically connected to the temperature sensor and the heater is used to control the heater to heat the gearbox based on the oil temperature detected by the temperature sensor.

[0005] In some embodiments, multiple temperature sensors are arranged at intervals along the circumferential and / or axial direction of the gearbox.

[0006] In some embodiments, the temperature sensor is disposed in the gearbox housing assembly, and the temperature measuring part of the temperature sensor is located inside the housing assembly.

[0007] In some embodiments, the housing assembly is provided with a mounting flange, and the temperature sensor is disposed on the side of the mounting flange near the input end of the gearbox; and / or, The housing assembly is provided with mounting holes, and the temperature sensor is installed at the mounting holes.

[0008] In some embodiments, the gearbox housing assembly includes a first housing, an internal gear ring, and a second housing. The first housing is located on the side of the internal gear ring closer to the input end of the gearbox, and the second housing is located on the side of the internal gear ring closer to the output end of the gearbox. The gearbox oil temperature control system satisfies at least one of the following conditions: The first housing is equipped with the heater; The internal gear ring is equipped with the heater; The second enclosure is equipped with the temperature sensor.

[0009] In some embodiments, the heater is arranged circumferentially and / or axially along the gearbox.

[0010] In some embodiments, the heater includes a heating band that is wound around the outside of the gearbox circumferentially.

[0011] In some embodiments, a fixed connector is provided between the two ends of the heating belt in the circumferential direction of the gearbox; and / or, the heating belt is spaced apart at both ends of the gearbox in the circumferential direction.

[0012] In some embodiments, the fastening member is an elastic element or a buckle.

[0013] In some embodiments, the heating band satisfies at least one of the following conditions: An adhesive layer is provided on the surface of the heating band near the gearbox; The surface of the heating band away from the gearbox is provided with a heat insulation layer; The heating band includes two silicone layers, and a heating element and a thermistor are electrically connected between the two silicone layers.

[0014] In some embodiments, the gearbox oil temperature control system further includes a current transformer, a leakage current protector, and an AC contactor electrically connected to the controller. The controller is used to control the start and stop of the gearbox oil temperature control system based on the temperature sensor, the current transformer, the leakage current protector, and the AC contactor.

[0015] To achieve the above objectives, the present invention also provides a gearbox oil temperature control method, which is based on the above-described gearbox oil temperature control system. The gearbox oil temperature control method includes: When the oil temperature detected by the temperature sensor is lower than the first oil temperature threshold, the heater is controlled to heat the gearbox. When the oil temperature detected by the temperature sensor is greater than the second oil temperature threshold, the heater is controlled to stop heating, wherein the second oil temperature threshold is greater than the first oil temperature threshold.

[0016] In some embodiments, before controlling the heater to heat the gearbox when the oil temperature detected by the temperature sensor is less than a first oil temperature threshold, the method further includes: Determine whether the gearbox oil temperature control system meets the preset conditions; If the preset conditions are met, it is determined whether the oil temperature detected by the temperature sensor is less than the first oil temperature threshold. If the preset conditions are not met, the power to the gearbox oil temperature control system will be cut off.

[0017] In some embodiments, the preset conditions include at least one of the following: The oil temperature detected by the temperature sensor is greater than a third oil temperature threshold and less than a fourth oil temperature threshold, wherein the third oil temperature threshold is less than the first oil temperature threshold and the fourth oil temperature threshold is greater than the second oil temperature threshold. The current transformer is used to determine that the AC contactor is in normal condition. The leakage current protection device confirmed that there was no leakage in the gearbox oil temperature control system. The power supply to the gearbox oil temperature control system was confirmed to be intact using an AC contactor.

[0018] In some embodiments, after the preset condition is not met, the gearbox oil temperature control system is powered off, the method further includes: When the gearbox oil temperature control system fails to meet the preset conditions for a period of time exceeding a preset duration, the gearbox drive system is powered off. The gearbox drive system is used to drive the gearbox.

[0019] To achieve the above objectives, the present invention also provides a wind turbine generator set, including the aforementioned gearbox oil temperature control system.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The gearbox oil temperature control system of this invention uses a temperature sensor to detect the lubricating oil temperature in the gearbox in real time. The controller can control the heater to heat the gearbox according to the oil temperature detected by the temperature sensor, thereby achieving precise control of the lubricating oil temperature. The gearbox oil temperature control system can effectively reduce the damping caused by the increase in lubricating oil viscosity in low-temperature environments, ensure the lubrication performance and smooth operation of the gearbox, avoid problems such as difficulty in starting at low temperatures and excessive transmission resistance, and improve the starting performance and operational reliability of the gearbox under low-temperature conditions. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 This is a schematic diagram of the gearbox oil temperature control system in an embodiment of the present invention; Figure 2 This is a flowchart of the gearbox oil temperature control method in an embodiment of the present invention.

[0023] Explanation of reference numerals in the accompanying drawings of this invention: Gearbox oil temperature control system 100, temperature sensor 1, gearbox 2, gearbox assembly 21, mounting flange 211, mounting hole 212, first gearbox 213, internal gear ring 214, second gearbox 215, input end 22, output end 23, heater 3, heating belt 31, heat insulation layer 311, and fixed connector 32.

[0024] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] This invention provides a gearbox oil temperature control system, which can be used in equipment such as wind turbine generators. The following description will use the application of this gearbox oil temperature control system in a wind turbine generator as an example. Figure 1 A preferred embodiment of the gearbox oil temperature control system provided by the present invention is shown.

[0029] Please see Figure 1 In some embodiments, the gearbox oil temperature control system 100 includes a temperature sensor 1, a heater 3, and a controller (not shown in the figure). The temperature sensor 1 is disposed in the gearbox 2, and the temperature measuring part of the temperature sensor 1 is located inside the gearbox 2. The temperature sensor 1 is used to detect the temperature of the lubricating oil in the gearbox 2. The heater 3 is disposed in the gearbox 2 and is used to heat the gearbox 2. The controller is electrically connected to the temperature sensor 1 and the heater 3. The controller is used to control the heater 3 to heat the gearbox 2 according to the oil temperature detected by the temperature sensor 1.

[0030] Specifically, the gearbox oil temperature control system 100 includes a temperature sensor 1, a heater 3, and a controller. The gearbox 2 may be part of the gearbox oil temperature control system 100, that is, the gearbox oil temperature control system 100 includes the gearbox 2; or the gearbox 2 may not be part of the gearbox oil temperature control system 100, that is, the gearbox oil temperature control system 100 does not include the gearbox 2. The following description will take the case where the gearbox oil temperature control system 100 includes the gearbox 2 as an example.

[0031] The gearbox oil temperature control system 100 is used in wind turbine generator sets. Gearbox 2 can be a wind turbine gearbox such as a yaw / pitch gearbox. The specific type of gearbox 2 can be set according to actual conditions; for example, gearbox 2 can be a planetary gearbox. The following description will use a yaw / pitch gearbox and a planetary gearbox as examples. Gearbox 2 has an input end 22 and an output end 23 opposite each other in the axial direction. The input end 22 of gearbox 2 is used for transmission connection with the gearbox drive system (not shown in the figure) in the wind turbine generator set. Thus, the gearbox drive system can drive gearbox 2 to operate. The axial direction of gearbox 2 is defined as vertical, input end 22 is the upper end of gearbox 2, and output end 23 is the lower end of gearbox 2.

[0032] Temperature sensor 1 is mounted on gearbox 2. The temperature measuring part of temperature sensor 1 is located inside gearbox 2 and extends into the lubricating oil. Thus, the gearbox oil temperature control system 100 can detect the lubricating oil temperature inside gearbox 2 in real time through temperature sensor 1. Temperature sensor 1 is electrically connected to the controller, allowing it to send the detected oil temperature to the controller. The specific type of temperature sensor 1 can be set according to actual conditions; for example, temperature sensor 1 can be a PT100 (platinum resistance thermometer), etc.

[0033] The specific number of temperature sensors 1 can be set according to actual needs; for example, one or more temperature sensors 1 can be used. Optionally, please refer to... Figure 1 In some embodiments, multiple temperature sensors 1 are provided at intervals along the circumferential and / or axial direction of the gearbox 2.

[0034] Specifically, multiple temperature sensors 1 are provided, which can be arranged at intervals along the vertical direction; multiple temperature sensors 1 can also be arranged at intervals along the circumference of the gearbox 2; multiple temperature sensors 1 can also be arranged in multiple rings, with each ring including at least two temperature sensors 1 arranged at intervals along the circumference of the gearbox 2, and the multiple rings of temperature sensors 1 arranged at intervals along the vertical direction. By arranging multiple temperature sensors 1 at intervals along the circumference and / or axial direction of the gearbox 2, multi-point distributed detection of the lubricating oil temperature in the gearbox 2 can be achieved, thereby comprehensively and accurately obtaining the oil temperature distribution at different locations, avoiding local temperature deviations and detection blind spots that exist in single-point temperature measurement, improving the overall accuracy and reliability of oil temperature detection; providing more comprehensive temperature data support for the controller, facilitating more precise and balanced heating control, preventing local overheating or underheating, further ensuring uniform and stable lubricating oil temperature, and better improving the starting and operating performance of the gearbox 2 under low-temperature conditions. The following will be an example of multiple temperature sensors 1 installed on the gearbox 2, which are evenly spaced along the circumference of the gearbox 2.

[0035] The heater 3 is mounted on the gearbox 2, so that the gearbox oil temperature control system 100 can heat the gearbox 2 through the heater 3 to increase the temperature of the lubricating oil inside the gearbox 2. The heater 3 is electrically connected to the controller, so that the controller can control the heater 3 to heat the gearbox 2.

[0036] When the controller receives the oil temperature detected by temperature sensor 1, it can control heater 3 to heat gearbox 2 based on the oil temperature detected by temperature sensor 1, thereby achieving precise control of lubricating oil temperature. The gearbox oil temperature control system 100 can effectively reduce the damping caused by increased lubricating oil viscosity in low-temperature environments, ensuring the lubrication performance and smooth operation of gearbox 2, avoiding problems such as difficulty in low-temperature starting and excessive transmission resistance, and improving the starting performance and operational reliability of gearbox 2 under low-temperature conditions.

[0037] Compared to external circulation heating systems for lubricating oil, the gearbox oil temperature control system 100 directly mounts the temperature sensor 1 and heater 3 onto the gearbox 2, eliminating the need for external circulation pipelines, pumps, and heat exchangers. This results in a simpler, more compact structure and easier installation and maintenance. The temperature sensor 1's measuring part is directly placed inside the gearbox 2, enabling real-time and accurate detection of the actual lubricating oil temperature within the gearbox 2. This avoids temperature lag and detection errors caused by pipeline heat exchange, resulting in faster temperature control response. The heater 3 directly heats the gearbox 2 and the internal lubricating oil, resulting in a shorter heat transfer path, lower heat loss, and higher heating efficiency. This quickly reduces the viscosity of the lubricating oil at low temperatures, effectively improving starting damping. Furthermore, the gearbox oil temperature control system 100 is more reliable and less susceptible to heating effects due to circulation pipeline failures.

[0038] The gearbox oil temperature control system 100 of the present invention detects the lubricating oil temperature in the gearbox 2 in real time through the temperature sensor 1. The controller can control the heater 3 to heat the gearbox 2 according to the oil temperature detected by the temperature sensor 1, so as to achieve precise control of the lubricating oil temperature. The gearbox oil temperature control system 100 can effectively reduce the damping caused by the increase in viscosity of the lubricating oil in low temperature environment, ensure the lubrication performance and smooth operation of the gearbox 2, avoid problems such as difficulty in starting at low temperature and excessive transmission resistance, and improve the starting performance and working reliability of the gearbox 2 under low temperature conditions.

[0039] The specific location of the temperature sensor 1 on the gearbox 2 can be set according to the actual situation. For example, the temperature sensor 1 can be set on the inner or outer surface of the gearbox housing assembly 21 or other parts of the gearbox 2. Optionally, please refer to Figure 1 In some embodiments, the temperature sensor 1 is disposed in the housing assembly 21 of the gearbox 2, and the temperature measuring part of the temperature sensor 1 is located inside the housing assembly 21.

[0040] Specifically, by placing the temperature sensor 1 on the housing assembly 21, the temperature measuring part of the temperature sensor 1 can be directly close to the lubricating oil inside the gearbox 2, so as to achieve direct and accurate detection of the lubricating oil temperature. Furthermore, the temperature sensor 1 is fixed by relying on the housing assembly 21, which makes the structure stable and easy to install.

[0041] Optionally, please refer to Figure 1 In some embodiments, the housing assembly 21 is provided with a mounting hole 212, and a temperature sensor 1 is provided at the mounting hole 212.

[0042] Specifically, a mounting hole 212 is provided on the housing assembly 21. The shape of the mounting hole 212 is usually adapted to the shape of the temperature sensor 1. The temperature sensor 1 is inserted into the mounting hole 212 so that the temperature measuring part of the temperature sensor 1 extends into the housing assembly 21 from the mounting hole 212. The temperature sensor 1 can completely seal the mounting hole 212, achieving a seal at the mounting hole 212. In this way, providing a mounting hole 212 on the housing assembly 21 allows the temperature sensor 1 to be reliably positioned and securely assembled, facilitating disassembly and subsequent maintenance. At the same time, the installation structure is compact and does not occupy additional space.

[0043] Optionally, please refer to Figure 1 In some embodiments, the housing assembly 21 is provided with a mounting flange 211, and a temperature sensor 1 is provided on the side of the mounting flange 211 near the input end 22 of the gearbox 2.

[0044] Specifically, a mounting flange 211 is provided on the outer surface of the housing assembly 21. The mounting flange 211 is usually located at the lower end of the gearbox 2 and above the output end 23 (i.e., close to the output end 23). The gearbox 2 can be installed in the wind turbine generator set through the mounting flange 211. Setting the temperature sensor 1 on the side of the mounting flange 211 closer to the input end 22 facilitates the installation and subsequent maintenance of the temperature sensor 1. Setting the temperature sensor 1 on the housing assembly 21 closer to the output end 23 allows for earlier and more accurate detection of the initial temperature change of the lubricating oil under low-temperature conditions, resulting in a faster temperature response and effectively reducing temperature detection lag.

[0045] As described above, gearbox 2 is a planetary gearbox, and its specific shape and style can be set according to actual needs. For example, gearbox 2 can be a single-stage planetary gearbox or a multi-stage planetary gearbox. Optionally, please refer to... Figure 1 In some embodiments, the gearbox 2 housing assembly 21 includes a first housing 213, an internal gear ring 214, and a second housing 215. The first housing 213 is located on the side of the internal gear ring 214 near the input end 22 of the gearbox 2, and the second housing 215 is located on the side of the internal gear ring 214 near the output end 23 of the gearbox 2.

[0046] Specifically, the housing assembly 21 includes a first housing 213, an internal gear ring 214, and a second housing 215. The first housing 213 is located on the upper side of the internal gear ring 214, and the second housing 215 is located on the lower side of the internal gear ring 214. The following description will take the housing assembly 21, which includes the first housing 213, the internal gear ring 214, and the second housing 215, as an example.

[0047] The specific location of temperature sensor 1 on the enclosure assembly 21 can be set according to actual conditions. Optionally, please refer to [link / reference needed]. Figure 1 In some embodiments, the second housing 215 is provided with a temperature sensor 1.

[0048] Specifically, the temperature sensor 1 is placed on the second housing 215 of the housing assembly 21, so that the temperature sensor 1 can be close to the output end 23 of the gearbox 2. This is beneficial for detecting the initial temperature change of the lubricating oil under low temperature conditions earlier and more accurately through the temperature sensor 1, resulting in a faster temperature response and effectively reducing temperature detection lag.

[0049] Heater 3 is installed in gearbox 2. The specific number of heaters 3 can be set according to actual needs; for example, one or more heaters 3 can be installed. Optionally, please refer to [link to relevant documentation]. Figure 1 In some embodiments, a plurality of heaters 3 are arranged on the gearbox 2 along the axial direction of the gearbox 2.

[0050] Specifically, multiple heaters 3 are arranged vertically on the gearbox 2, which allows the heating area formed by the multiple heaters 3 to evenly cover the axial range of the gearbox 2, avoiding uneven heating or heating dead zones in the gearbox 2, and making the lubricating oil in the gearbox 2 more fully heated and the temperature distribution more even.

[0051] The heater 3 is typically arranged along the circumference and / or axial direction of the gearbox 2. The circumferential arrangement of the heater 3 can be either an extension of the heater 3 along the circumference of the gearbox 2, or multiple heaters 3 can be arranged along the circumference of the gearbox 2. Similarly, the axial arrangement of the heater 3 along the gearbox 2 can also be either an extension of the heater 3 along the axial direction of the gearbox 2, or multiple heaters 3 can be arranged along the axial direction of the gearbox 2.

[0052] The specific location of the temperature sensor 1 on the gearbox 2 can be set according to the actual situation. For example, the temperature sensor 1 can be set on the inner or outer surface of the gearbox housing assembly 21 or other parts of the gearbox 2. Optionally, please refer to Figure 1 In some embodiments, the heater 3 is disposed on the outer surface of the housing assembly 21.

[0053] Specifically, the heater 3 is placed on the outer surface of the housing assembly 21, without penetrating the interior of the gearbox 2. This avoids damaging the sealing structure of the housing assembly 21, preventing lubricating oil leakage, and significantly simplifies installation and subsequent maintenance. The heater 3 heats the internal lubricating oil through heat conduction from the housing assembly 21. The installation layout is flexible, and the heat transfer is direct and efficient, quickly raising the oil temperature and reducing its viscosity. At the same time, it does not affect the internal transmission and lubrication environment of the gearbox 2, ensuring reliable heating and stable operation under low-temperature conditions. The following will describe the installation of the heater 3 on the outer surface of the housing assembly 21 as an example.

[0054] The specific location of the heater 3 on the housing assembly 21 can be set according to actual conditions. For example, the heater 3 can be located in the first housing 213, the internal gear ring 214, the second housing 215, or other locations on the housing assembly 21. Optionally, please refer to... Figure 1 In some embodiments, the first housing 213 is provided with a heater 3.

[0055] Specifically, the heater 3 is placed on the first housing 213 so that the heater 3 can be close to the input end 22 of the gearbox 2. It can selectively heat the input end area of ​​the gearbox 2, quickly reduce the viscosity of the lubricating oil in this area, and effectively alleviate the problem of high damping at low temperature at the input end 22.

[0056] Optionally, please refer to Figure 1 In some embodiments, the internal gear ring 214 is provided with a heater 3.

[0057] Specifically, the heater 3 is placed on the internal gear ring 214, so that the heater 3 can directly heat the core transmission area of ​​the gearbox 2. The heat transfer path is shorter and the heating is more direct and efficient, which can quickly reduce the viscosity of the lubricating oil in the core transmission area and reduce the running damping of the gear meshing parts. At the same time, it can balance the temperature in the middle of the gearbox 2, avoid the occurrence of heating blind spots, and improve the uniformity of oil temperature.

[0058] The specific type of heater 3 can be set according to actual conditions. For example, heater 3 can be a heating belt, heating wire, heating rod, heating plate, or heating jacket, etc. Optionally, please refer to [link to relevant documentation]. Figure 1 In some embodiments, the heater 3 includes a heating band 31 that is wound around the outside of the gearbox 2 along the circumference of the gearbox 2.

[0059] Specifically, the heater 3 employs a heating belt 31 wound circumferentially around the gearbox 2. On one hand, the heating belt 31 can closely adhere to the outer surface of the gearbox 2, achieving direct contact heating, resulting in efficient and uniform heat transfer, rapidly increasing oil temperature and reducing lubricating oil viscosity. On the other hand, the heating belt 31 has a simple structure and low cost; its circumferential winding installation is convenient and easy, and subsequent disassembly, replacement, and maintenance are also convenient, effectively reducing usage and maintenance costs. Furthermore, the heating belt 31 operates stably and reliably with a low failure rate and excellent safety performance. The heating belt 31 can be a flexible heating belt, etc.

[0060] The heating band 31 can be directly connected at both ends of the gearbox 2 in the circumferential direction, i.e., the beginning and end of the heating band 31 overlap; alternatively, the heating band 31 can be spaced apart at both ends of the gearbox 2 in the circumferential direction, i.e., a circumferential gap is formed between the beginning and end of the heating band 31. Optionally, please refer to Figure 1 In some embodiments, the heating bands 31 are spaced apart at both ends of the gearbox 2 in the circumferential direction.

[0061] Specifically, the heating bands 31 are arranged at intervals at both ends of the gearbox 2 in the circumferential direction, which can avoid the problems of local overheating, short circuit and uneven heating caused by the overlap of the heating bands 31. The following will take the arrangement of the heating bands 31 at intervals at both ends of the gearbox 2 in the circumferential direction as an example.

[0062] When heating bands 31 are provided on both the first housing 213 and the internal gear ring 214, the circumferential gap of the heating band 31 on the first housing 213 and the circumferential gap of the heating band 31 on the internal gear ring 214 can be staggered vertically. For example, the circumferential gap of the heating band 31 on the first housing 213 and the circumferential gap of the heating band 31 on the internal gear ring 214 can be staggered by 180°. By staggering the circumferential gaps of the heating bands 31 on the first housing 213 and the internal gear ring 214 vertically, the formation of a through-type low-temperature area in the heating gap can be avoided, eliminating the heating dead angles in the circumferential and axial directions of the gearbox 2, making the overall heating of the gearbox 2 more uniform, and effectively preventing local oil temperature from being too low.

[0063] Optionally, please refer to Figure 1 In some embodiments, the heating band 31 is provided with a fixed connector 32 between the two ends of the gearbox 2 in the circumferential direction.

[0064] Specifically, a fixing connector 32 is provided at the circumferential gap of the heating band 31 to fix the two ends of the heating band 31 together, thereby preventing the heating band 31 from falling off the gearbox 2. The specific arrangement of the fixing connector 32 can be set according to the actual situation. For example, the fixing connector 32 can be an elastic element such as a spring or elastic band; the fixing connector 32 can also be a locking element such as a buckle.

[0065] Optionally, please refer to Figure 1 In some embodiments, the heating band 31 is provided with an adhesive layer (not shown in the figure) on the surface near the gearbox 2.

[0066] Specifically, the adhesive layer is an adhesive, for example, it can be a thermally conductive adhesive with good thermal conductivity. The heating band 31 is adhered to the gearbox 2 using a high-performance adhesive, which further reinforces the heating band 31 and prevents it from falling off the gearbox 2.

[0067] Optionally, please refer to Figure 1 In some embodiments, the surface of the heating band 31 away from the gearbox 2 is provided with a heat insulation layer 311.

[0068] Specifically, the heat insulation layer 311 is made of heat insulation material. For example, the heat insulation layer 311 can be an insulating heat insulation layer made of insulating heat insulation material. In this way, setting the heat insulation layer 311 on the heating belt 31 can effectively reduce the risk of electric leakage and burns to personnel, and improve the safety of the gearbox oil temperature control system 100.

[0069] Optionally, please refer to Figure 1 In some embodiments, the heating band 31 includes two silicone layers, with an electrically connected heating element and a thermistor disposed between the two silicone layers.

[0070] Specifically, the heating band 31 consists of two layers of silicone and an internal heating element and a thermal protector. The heating element can heat metal foil or resistance wire, etc. The thermal protector can be a temperature-sensing fuse or a temperature-controlling PTC (positive temperature coefficient thermistor), etc. The thermal protector is used to limit the maximum temperature of the heating band 31 to prevent fire.

[0071] Optionally, in some embodiments, the gearbox oil temperature control system 100 further includes a current transformer (not shown in the figure), a leakage current protector (not shown in the figure), and an AC contactor (not shown in the figure) electrically connected to the controller. The controller is used to control the start and stop of the gearbox oil temperature control system 100 based on the temperature sensor 1, the current transformer, the leakage current protector, and the AC contactor.

[0072] Specifically, the residual current device (RCD) is used to detect whether the gearbox oil temperature control system 100 is leaking current, and the AC contactor is used to switch the gearbox oil temperature control system 100 on and off. The current transformer is used to detect the current signal of the gearbox oil temperature control system 100. Thus, the controller can determine the on / off state of the gearbox oil temperature control system 100 and whether the AC contactor has malfunctioned based on the current signal detected by the current transformer.

[0073] As described above, the controller can control the heater 3 to heat the gearbox 2 based on the oil temperature detected by the temperature sensor 1. The specific oil temperature control method adopted by the controller can be set according to the actual situation. Optionally, in some embodiments, when the oil temperature detected by the temperature sensor 1 is less than a first oil temperature threshold, the controller controls the heater 3 to heat the gearbox 2; when the oil temperature detected by the temperature sensor 1 is greater than a second oil temperature threshold, the controller controls the heater 3 to stop heating.

[0074] Specifically, when the oil temperature detected by temperature sensor 1 is higher than the first oil temperature threshold t1, the controller does not control heater 3 to heat gearbox 2, i.e., heater 3 is not working, while temperature sensor 1 continuously monitors the lubricating oil temperature of gearbox 2. When the oil temperature detected by temperature sensor 1 is lower than the first oil temperature threshold t1, the controller controls heater 3 to heat gearbox 2, while temperature sensor 1 continuously monitors the lubricating oil temperature of gearbox 2. When the oil temperature detected by temperature sensor 1 is higher than the second oil temperature threshold t2, the controller controls heater 3 to stop heating, thereby ensuring that the lubricating oil temperature of gearbox 2 is maintained between t1 and t2.

[0075] Optionally, in some embodiments, the controller is used to control the start and stop of the gearbox oil temperature control system 100 based on the acquired signals.

[0076] Specifically, the acquired signals include the temperature signal acquired by temperature sensor 1, the current signal acquired by current transformer, and the leakage current signal acquired by leakage current protector. The controller can determine whether there is a signal abnormality in the gearbox oil temperature control system 100 based on the acquired signals. When there is no signal abnormality in the gearbox oil temperature control system 100, the controller will control heater 3 to heat the gearbox 2 based on the oil temperature detected by temperature sensor 1. When there is a signal abnormality in the gearbox oil temperature control system 100, the controller will cut off the power to the gearbox oil temperature control system 100.

[0077] When the gearbox oil temperature control system 100 experiences a signal abnormality, if the signal abnormality returns to normal within a preset time T, the controller will control the heater 3 to heat the gearbox 2 based on the oil temperature detected by the temperature sensor 1; if the signal abnormality lasts longer than the preset time T, the controller will send a power-off command to the gearbox drive system to de-energize the entire gearbox drive system.

[0078] When any of the following situations occur in the gearbox oil temperature control system 100, the controller will determine that the gearbox oil temperature control system 100 has a signal abnormality: 1. The oil temperature detected by temperature sensor 1 is less than the third oil temperature threshold t3 (for example, the third oil temperature threshold t3 can be -40℃), or the oil temperature detected by temperature sensor 1 is greater than the fourth oil temperature threshold t4 (for example, the fourth oil temperature threshold t4 can be 70℃), wherein the third oil temperature threshold t3 is less than the first oil temperature threshold t1, and the fourth oil temperature threshold t4 is greater than the second oil temperature threshold t2; 2. The controller determines that the AC contactor is not in a normal state (i.e., the AC contactor cannot be closed or opened) through the current signal of the current transformer; 3. The controller determines that the gearbox oil temperature control system 100 is leaking current through the leakage current signal of the leakage current protector; 4. The controller determines that the gearbox oil temperature control system 100 is de-energized through the AC contactor.

[0079] The present invention also provides a gearbox oil temperature control method, which can be implemented based on the above-described gearbox oil temperature control system. Figure 2 A preferred embodiment of the gearbox oil temperature control method provided by the present invention is shown.

[0080] Please see Figure 2 In some embodiments, the gearbox oil temperature control method includes the following steps S210 and S220.

[0081] Step S210: When the oil temperature detected by the temperature sensor is lower than the first oil temperature threshold, control the heater to heat the gearbox.

[0082] Specifically, when the oil temperature detected by temperature sensor 1 is greater than the first oil temperature threshold t1, the controller does not control heater 3 to heat gearbox 2, that is, heater 3 does not work, while temperature sensor 1 continuously monitors the lubricating oil temperature of gearbox 2. When the oil temperature detected by temperature sensor 1 is less than the first oil temperature threshold t1, the controller controls heater 3 to heat gearbox 2, while temperature sensor 1 continuously monitors the lubricating oil temperature of gearbox 2.

[0083] Step S220: When the oil temperature detected by the temperature sensor is greater than the second oil temperature threshold, control the heater to stop heating.

[0084] Specifically, the second oil temperature threshold t2 is greater than the first oil temperature threshold t1. When the heater 3 heats the gearbox 2, the temperature sensor 1 continuously monitors the lubricating oil temperature of the gearbox 2. When the oil temperature detected by the temperature sensor 1 is greater than the second oil temperature threshold t2, the controller controls the heater 3 to stop heating, thereby ensuring that the lubricating oil temperature of the gearbox 2 is maintained between t1 and t2.

[0085] Optionally, in some embodiments, before performing step S210, the control also performs steps S201 to S203.

[0086] Step S201: Determine whether the gearbox oil temperature control system meets the preset conditions.

[0087] Specifically, the controller determines whether the gearbox oil temperature control system 100 meets preset conditions based on the collected signals. The collected signals include temperature signals collected by temperature sensor 1, current signals collected by current transformer, and leakage current signals collected by leakage current protector. The controller can determine whether there are any signal abnormalities in the gearbox oil temperature control system 100 based on the collected signals.

[0088] Step S202: If the preset conditions are met, determine whether the oil temperature detected by the temperature sensor is less than the first oil temperature threshold.

[0089] Specifically, when the gearbox oil temperature control system 100 does not show any abnormal signals, the controller determines that the gearbox oil temperature control system 100 meets the preset conditions. When the controller determines that the gearbox oil temperature control system 100 meets the preset conditions, the controller will determine whether the oil temperature detected by the temperature sensor 1 is less than the first oil temperature threshold t1, so as to control the heater 3 to heat the gearbox 2 according to the oil temperature detected by the temperature sensor 1.

[0090] Step S203: If the preset conditions are not met, the gearbox oil temperature control system is powered off.

[0091] Specifically, when the gearbox oil temperature control system 100 experiences a signal abnormality, the controller determines that the gearbox oil temperature control system 100 does not meet the preset conditions. When the controller determines that the gearbox oil temperature control system 100 does not meet the preset conditions, the controller will cut off the power to the gearbox oil temperature control system 100.

[0092] Optionally, in some embodiments, the preset conditions include at least one of the following: 1. The oil temperature detected by temperature sensor 1 is greater than a third oil temperature threshold and less than a fourth oil temperature threshold, wherein the third oil temperature threshold is less than a first oil temperature threshold and the fourth oil temperature threshold is greater than a second oil temperature threshold; 2. The current transformer determines that the AC contactor is in a normal state; 3. The leakage current protector determines that the gearbox oil temperature control system 100 has no leakage current; 4. The AC contactor determines that the gearbox oil temperature control system 100 is not de-energized.

[0093] Specifically, in the first step, if the oil temperature detected by temperature sensor 1 is less than the third oil temperature threshold t3 or less than the fourth oil temperature threshold t4, the controller determines that the gearbox oil temperature control system 100 has a signal abnormality; otherwise, the second step is executed.

[0094] The second step is to determine that the AC contactor is not in a normal state (i.e., it cannot be closed or opened) by using the current transformer. If the controller determines that the gearbox oil temperature control system 100 has a signal abnormality, then proceed to the third step.

[0095] Third step: If the leakage current protection device determines that the gearbox oil temperature control system 100 is leaking current, the controller will determine that the gearbox oil temperature control system 100 has a signal abnormality; otherwise, proceed to the fourth step.

[0096] Step 4: If the power to the gearbox oil temperature control system 100 is determined by the AC contactor, the controller determines that the gearbox oil temperature control system 100 has a signal abnormality; otherwise, the gearbox oil temperature control system 100 has no signal abnormality.

[0097] Optionally, in some embodiments, after performing step S203, the control also performs step S204.

[0098] Step S204: When the gearbox oil temperature control system 100 fails to meet the preset conditions for a period of time exceeding the preset duration, the gearbox drive system is powered off. The gearbox drive system is used to drive the gearbox 2.

[0099] Specifically, when the gearbox oil temperature control system 100 experiences a signal abnormality, if the signal abnormality returns to normal within a preset time T, the controller will control the heater 3 to heat the gearbox 2 based on the oil temperature detected by the temperature sensor 1; if the signal abnormality lasts longer than the preset time T, the controller will send a power-off command to the gearbox drive system to de-energize the entire gearbox drive system.

[0100] The present invention also provides a wind turbine generator set, which includes a gearbox oil temperature control system. Since the gearbox oil temperature control system adopts the technical solution of the above embodiments, it has the beneficial effects brought about by the technical solution of the above embodiments.

[0101] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A gearbox oil temperature control system, characterized in that, include: A temperature sensor is provided, wherein the temperature sensor is disposed in the gearbox, the temperature measuring part of the temperature sensor is located inside the gearbox, and the temperature sensor is used to detect the temperature of the lubricating oil inside the gearbox; A heater, disposed in the gearbox, is used to heat the gearbox; A controller electrically connected to the temperature sensor and the heater is used to control the heater to heat the gearbox based on the oil temperature detected by the temperature sensor.

2. The gearbox oil temperature control system according to claim 1, characterized in that, Multiple temperature sensors are arranged at intervals along the circumferential and / or axial direction of the gearbox.

3. The gearbox oil temperature control system according to claim 1, characterized in that, The temperature sensor is disposed in the gearbox housing assembly, and the temperature measuring part of the temperature sensor is located inside the housing assembly.

4. The gearbox oil temperature control system according to claim 3, characterized in that, The housing assembly is provided with a mounting flange, and the temperature sensor is located on the side of the mounting flange near the input end of the gearbox; and / or, The housing assembly is provided with mounting holes, and the temperature sensor is installed at the mounting holes.

5. The gearbox oil temperature control system according to claim 1, characterized in that, The gearbox housing assembly includes a first housing, an internal gear ring, and a second housing. The first housing is located on the side of the internal gear ring closer to the input end of the gearbox, and the second housing is located on the side of the internal gear ring closer to the output end of the gearbox. The gearbox oil temperature control system satisfies at least one of the following conditions: The first housing is equipped with the heater; The internal gear ring is equipped with the heater; The second enclosure is equipped with the temperature sensor.

6. The gearbox oil temperature control system according to claim 1, characterized in that, The heater is arranged circumferentially and / or axially along the gearbox.

7. The gearbox oil temperature control system according to claim 1, characterized in that, The heater includes a heating belt that is wound around the outside of the gearbox circumferentially.

8. The gearbox oil temperature control system according to claim 7, characterized in that, The heating belt is provided with a fixed connector between the two ends of the gearbox in the circumferential direction; and / or, the heating belt is provided at intervals between the two ends of the gearbox in the circumferential direction.

9. The gearbox oil temperature control system according to claim 8, characterized in that, The fixed connector is an elastic element or a buckle.

10. The gearbox oil temperature control system according to claim 7, characterized in that, The heating belt must meet at least one of the following conditions: An adhesive layer is provided on the surface of the heating band near the gearbox; The surface of the heating band away from the gearbox is provided with a heat insulation layer; The heating band includes two silicone layers, and a heating element and a thermistor are electrically connected between the two silicone layers.

11. The gearbox oil temperature control system according to claim 1, characterized in that, The gearbox oil temperature control system also includes a current transformer, a leakage current protector, and an AC contactor electrically connected to the controller. The controller is used to control the start and stop of the gearbox oil temperature control system based on the temperature sensor, the current transformer, the leakage current protector, and the AC contactor.

12. A gearbox oil temperature control method, implemented based on the gearbox oil temperature control system as described in any one of claims 1-11, characterized in that, The gearbox oil temperature control method includes: When the oil temperature detected by the temperature sensor is lower than the first oil temperature threshold, the heater is controlled to heat the gearbox. When the oil temperature detected by the temperature sensor is greater than the second oil temperature threshold, the heater is controlled to stop heating, wherein the second oil temperature threshold is greater than the first oil temperature threshold.

13. The gearbox oil temperature control method according to claim 12, characterized in that, Before controlling the heater to heat the gearbox when the oil temperature detected by the temperature sensor is lower than the first oil temperature threshold, the method further includes: Determine whether the gearbox oil temperature control system meets the preset conditions; If the preset conditions are met, it is determined whether the oil temperature detected by the temperature sensor is less than the first oil temperature threshold. If the preset conditions are not met, the power to the gearbox oil temperature control system will be cut off.

14. The gearbox oil temperature control method according to claim 13, characterized in that, The preset conditions include at least one of the following: The oil temperature detected by the temperature sensor is greater than a third oil temperature threshold and less than a fourth oil temperature threshold, wherein the third oil temperature threshold is less than the first oil temperature threshold and the fourth oil temperature threshold is greater than the second oil temperature threshold. The current transformer is used to determine that the AC contactor is in normal condition. The leakage current protection device confirmed that there was no leakage in the gearbox oil temperature control system. The power supply to the gearbox oil temperature control system was confirmed to be intact using an AC contactor.

15. The gearbox oil temperature control method according to claim 13, characterized in that, After the preset condition is not met, and the power to the gearbox oil temperature control system is cut off, the following further applies: When the gearbox oil temperature control system fails to meet the preset conditions for a period of time exceeding a preset duration, the gearbox drive system is powered off. The gearbox drive system is used to drive the gearbox.

16. A wind turbine generator set, characterized in that, Including the gearbox oil temperature control system as described in any one of claims 1-11.

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