Hybrid cooling system of wind driven generator

Abstract

The invention provides a hybrid cooling system of a wind driven generator, and belongs to the field of parts of wind power generation equipment. A hybrid cooling system of a wind driven generator comprises a machine body, a lateral wind power mechanism, a rotary inertia energy storage unit, a suspending hammer mechanism and a low-temperature locking mechanism. When encountering low-temperature and strong-wind severe weather, the wind generating set only needs to be yawed until the plane of a wind wheel is parallel to the wind direction, the opening and closing assembly can be driven through the lateral wind power mechanism, the rotary inertia energy storage unit, the suspending hammer mechanism and the low-temperature locking mechanism, closing of the cooling air channel is achieved, and therefore airflow cannot penetrate through the cooling air channel; the heat loss in the cooling air duct is further reduced; no extra intervention of personnel is needed, no power is consumed, and the energy of the storage battery is not consumed.

Description

Technical Field

[0001] The present application belongs to the technical field of wind power equipment components, and more specifically, to a hybrid cooling system for a wind power generator. Background Art

[0002] Wind power generation is a form of green power generation that the country is vigorously promoting. Wind turbine generator sets are mainly composed of wind rotors, wind rotor shafts, reducers, generators and cooling systems, among which the cooling system is mainly used to dissipate heat from wind rotor shafts, reducers, generators and other parts to ensure the normal operation of the equipment.

[0003] Normally, the cooling system will continue to operate with the wind turbine. However, if there is heavy precipitation or strong convective weather such as blizzards and hail, especially in high-cold areas, the unit needs to be shut down to ensure safety. When the wind turbine is shut down, the cooling system will also stop running and the cooling medium will stop circulating. At this time, the external heat dissipation unit can easily cause the internal cooling medium to freeze due to the low temperature, thereby blocking the circulation path of the entire cooling system and even causing damage. In this regard, the common practice is to add a heating unit to the cooling system. When encountering bad weather, the cooling system is kept running at a low speed, and the heating unit is used to continuously heat the cooling medium therein, which can prevent the cooling medium from freezing on the one hand, and ensure that the lubricating oil, batteries and other electronic devices are within the working temperature on the other hand. However, since the external heat dissipation unit loses a lot of heat in bad weather, it is necessary to use a very high-power heating unit for heating to ensure that the cooling medium in the cooling system will not freeze, which causes a great waste of battery energy. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a hybrid cooling system for a wind turbine generator to solve the technical problem in the prior art that the cooling system loses too much heat when the wind turbine generator set is shut down in severe weather with low temperature and high wind.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In one aspect, a hybrid cooling system for a wind turbine is provided, comprising:

[0007] The machine body is provided with at least one cooling air duct along the front-to-back direction, a plurality of coolant pipes are wound around the outside of the cooling air duct and heat is exchanged with the cooling air duct, and an opening and closing component is provided at the rear end opening of the cooling air duct;

[0008] A lateral wind force mechanism, adapted to convert the wind force on both sides of the machine body into rotation of the output shaft;

[0009] A rotational inertia energy storage unit connected to the output shaft of the lateral wind force mechanism via an overrunning clutch;

[0010] A pendulum mechanism, comprising a rotating shaft and a pendulum; the rotating shaft is connected to the output shaft of the rotational inertia energy storage unit; the pendulum is suspended on the side of the rotating shaft, and swings upward by centrifugal action when the rotating shaft rotates;

[0011] The low-temperature locking mechanism comprises a sliding shaft, a fixed sleeve, a bimetallic strip and an active clamp; the sliding shaft is axially slidable and penetrates into the fixed sleeve; the sliding shaft is connected to the suspension weight through a pull rod so as to be pulled upward when the suspension weight swings upward; the sliding shaft is transmission-connected to the opening and closing component so as to drive the opening and closing component to open when the sliding shaft moves upward; a card slot is provided on the inner wall of the fixed sleeve, and the bimetallic strip and the active clamp are provided on the sliding shaft; the bimetallic strip senses the external temperature, and when the temperature is lower than a predetermined value, pushes the active clamp out of the side of the sliding shaft, so that after the sliding shaft drives the opening and closing component to close, the active clamp can engage with the card slot to limit the sliding shaft from sliding downward; when the temperature is higher than a predetermined value, the bimetallic strip drives the active clamp to separate from the card slot.

[0012] In some embodiments, the opening and closing assembly includes:

[0013] A plurality of blades are distributed along the circumference of the rear end opening of the cooling air duct, and each of the blades is hinged to the rear end of the cooling air duct; and

[0014] A control ring, rotatably disposed at the rear end of the cooling air duct and connected to the blades via a connecting rod;

[0015] When the control ring rotates, the connecting rod pulls the blades, so that the plurality of blades converge toward the middle to close the rear end opening of the cooling air duct, or disperse to the surroundings to open the rear end opening of the cooling air duct.

[0016] In some embodiments, the opening and closing assembly also includes a control rope, which is wound around the outer circumference of the control ring of each opening and closing assembly, and one end of the control rope is pulled by a tension spring, and the other end is fixed to the sliding shaft of the low-temperature locking mechanism; the tension spring pulls the control rope to cause the multiple blades to disperse to the surroundings to open the rear end opening of the cooling air duct, and the sliding shaft pulls the control rope to cause the multiple blades to gather in the middle to close the rear end opening of the cooling air duct.

[0017] In some embodiments, the lateral wind force mechanism comprises:

[0018] A lateral air duct is provided at the rear of the machine body and penetrates along both sides of the machine body; and

[0019] The impeller is arranged in the lateral wind duct and is drivingly connected to the output shaft of the lateral wind force mechanism.

[0020] In some embodiments, the rotational inertia energy storage unit includes a rotatably arranged mass flywheel, and the surface of the mass flywheel has a concave-convex structure to increase the friction with the ambient gas.

[0021] In some embodiments, the pendulum mechanism includes two pendulums, and the two pendulums are symmetrically arranged on both sides of the rotating shaft;

[0022] An intermediate sleeve is arranged at the upper end of the sliding shaft. The intermediate sleeve is arranged for axial limiting and circumferential rotation. The intermediate sleeve is respectively connected with the two hanging weights through connecting rods.

[0023] In some embodiments, the sliding shaft is provided with a receiving groove, the bimetallic strip is arranged in the receiving groove along the axial direction of the sliding shaft, one end of the bimetallic strip is fixed and the other end is free to move, and the low-temperature protrusion side of the bimetallic strip faces outward;

[0024] The movable clamp is arranged in the accommodating groove, and one end is rotatably connected to the sliding shaft, and the other end is a clamping end located outside the low-temperature protrusion side of the bimetallic strip, and the low-temperature protrusion side of the bimetallic strip and the clamping end of the movable clamp are connected through a buffer spring.

[0025] In some embodiments, the front end opening of the cooling air duct is provided with a suspended closed window, and the suspended closed window includes a plurality of horizontal lightweight blades distributed from top to bottom, the upper edge of each lightweight blade is rotatably connected to the cooling air duct, and the lower edge is drooping, the upper and lower edges of adjacent lightweight blades overlap each other, and the lower edge of the upper lightweight blade is located on the rear side of the lower lightweight blade.

[0026] In some embodiments, the cooling air duct is provided with heat dissipation fins inside, and the heat dissipation fins are arranged in the front-to-back direction, and the wind wheel shaft, reducer and generator coolant pipes in the body are all wound around the outside of the cooling air duct.

[0027] The beneficial effect of the hybrid cooling system for wind turbines provided in the embodiment of the present application is that compared with the prior art, the hybrid cooling system for wind turbines in the embodiment of the present application, when encountering severe weather with low temperature and strong wind, only needs to yaw the wind turbine generator set to make the wind rotor plane parallel to the wind direction, and then the opening and closing components can be driven by the lateral wind mechanism, the rotational inertia energy storage unit, the hanging hammer mechanism and the low-temperature locking mechanism to achieve the closure of the cooling air duct, so that the airflow cannot pass through the cooling air duct, thereby reducing the heat loss in the cooling air duct; no additional intervention by personnel is required, there is no electricity consumption, and the energy of the battery will not be consumed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 Schematic diagram of the internal structure of the hybrid cooling system for a wind turbine provided in an embodiment of the present application Figure 1 ;

[0030] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0031] Figure 3 for Figure 1 Front view of each cooling air duct;

[0032] Figure 4 for Figure 1 The front view of the central control rope driving each opening and closing component;

[0033] Figure 5 for Figure 4 Structural diagram of the middle opening and closing component;

[0034] Figure 6 for Figure 1 Schematic diagram of the structure of the mid-hung closed window.

[0035] Among them, the reference numerals in the figure are:

[0036] 1-machine body; 2-cooling air duct; 21-coolant pipeline; 22-opening and closing assembly; 221-blade; 222-control ring; 223-connecting rod; 224-control rope; 225-tension spring; 23-suspended closed window; 231-lightweight blade; 24-heat dissipation fin; 3-lateral wind force mechanism; 31-lateral air duct; 32-impeller; 4-mass flywheel; 41-overrunning clutch; 5-hammer mechanism; 51-hammer; 52-middle sleeve; 6-low temperature locking mechanism; 61-sliding shaft; 611-accommodating groove; 62-fixing sleeve; 621-card slot; 63-bimetallic sheet; 64-movable card head; 65-buffer spring. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] Please also read Figures 1 to 6The hybrid cooling system for a wind turbine generator provided by an embodiment of the present application is now described. A hybrid cooling system for a wind turbine generator comprises:

[0039] The machine body is provided with at least one cooling air duct along the front-back direction, a plurality of coolant pipes are wound around the outside of the cooling air duct and heat is exchanged with the cooling air duct, and an opening and closing component is provided at the rear end opening of the cooling air duct;

[0040] The lateral wind force mechanism is suitable for converting the wind force on both sides of the machine body into the rotation of the output shaft;

[0041] The rotary inertia energy storage unit is connected to the output shaft of the lateral wind power mechanism through an overrunning clutch;

[0042] The pendulum mechanism comprises a rotating shaft and a pendulum; the rotating shaft is connected to the output shaft of the rotating inertia energy storage unit; the pendulum is suspended on the side of the rotating shaft, and swings upward by centrifugal action when the rotating shaft rotates;

[0043] The low-temperature locking mechanism comprises a sliding shaft, a fixed sleeve, a bimetallic strip and a movable clamp; the sliding shaft is axially slidable in the fixed sleeve; the sliding shaft is connected to the suspension weight through a pull rod so as to be pulled upward when the suspension weight swings upward; the sliding shaft is transmission-connected with the opening and closing component so as to drive the opening and closing component to open when the sliding shaft moves upward; a card slot is provided on the inner wall of the fixed sleeve, and the bimetallic strip and the movable clamp are provided on the sliding shaft; the bimetallic strip senses the external temperature, and when the temperature is lower than a predetermined value, the movable clamp is pushed out of the side of the sliding shaft, so that after the sliding shaft drives the opening and closing component to close, the movable clamp can engage with the card slot to limit the sliding shaft from sliding downward; when the temperature is higher than a predetermined value, the bimetallic strip drives the movable clamp to separate from the card slot.

[0044] Compared with the prior art, the hybrid cooling system of the wind turbine generator in the embodiment of the present application, when encountering severe weather with low temperature and strong wind, only needs to yaw the wind turbine generator set to make the wind rotor plane parallel to the wind direction, and then it can drive the opening and closing components through the lateral wind mechanism, the rotational inertia energy storage unit, the hanging hammer mechanism and the low-temperature locking mechanism to achieve the closure of the cooling air duct, so that the airflow cannot pass through the cooling air duct, thereby reducing the heat loss in the cooling air duct; no additional personnel intervention is required, there is no power consumption, and the energy of the battery will not be consumed.

[0045] When the wind turbine generator set is operating normally, the front end of the machine body faces the wind, the opening and closing components at the rear end of the cooling duct are opened, and the airflow passes through the cooling duct to take away the heat. When encountering bad weather with low temperature and strong wind, the wind turbine generator set is yawed to the wind rotor plane parallel to the wind direction to ensure that the wind rotor is not damaged. At this time, the lateral wind force mechanism on the machine body faces the wind, and through the rotating inertial energy storage unit, the hanging hammer mechanism and the low-temperature locking mechanism, it finally drives the opening and closing components to close the rear end of the cooling duct, so that the airflow cannot pass through the cooling duct, thereby reducing the heat loss in the cooling duct. When the weather gets better, it is only necessary to yaw the wind turbine generator set to the state where the wind rotor faces the wind. Since the lateral wind force mechanism is not affected by the wind, and the temperature rises and the low-temperature locking mechanism no longer restricts the sliding of the sliding shaft, the opening and closing components automatically open, and the cooling duct works normally.

[0046] Specifically, if the weather is windy and the wind turbine generator set yaws until the rotor plane is parallel to the wind direction, the lateral wind force mechanism drives the rotating inertial energy storage unit and the hanging hammer mechanism to reach a certain speed, so that the hanging hammer mechanism drives the sliding shaft of the low-temperature locking mechanism, and then drives the opening and closing component through the sliding shaft to close the rear end of the cooling air duct. In this case, due to the excessive wind force, the rotation speed of the rotating inertial energy storage unit is consistently maintained at a high level, so that the hanging hammer mechanism drives the sliding shaft to keep the opening and closing component in a closed state. When the weather improves, the energy of the rotating inertial energy storage unit gradually dissipates, and the speed of the hanging hammer mechanism decreases, thereby closing the opening and closing component.

[0047] If the weather is windy but the temperature is too low, after the wind turbine generator set yaws to the plane of the wind rotor parallel to the wind direction, the lower wind speed continues to blow the lateral wind mechanism, so that the rotating inertial energy storage unit continues to absorb wind energy, so that the rotation speed of the rotating inertial energy storage unit and the hanging hammer mechanism gradually increases, and finally the sliding shaft drives the opening and closing component to close the rear end of the cooling air duct. Because the outside temperature is cold at this time, the bimetallic strip of the low-temperature locking mechanism pushes the active clamp head into the slot of the fixed sleeve, so that the opening and closing component remains in the closed state. Even if the outside wind weakens for a short time, it will not cause the opening and closing component to open and close repeatedly. When the weather gets better, the temperature rises, causing the bimetallic strip to drive the active clamp head to separate from the slot, releasing the restriction on the sliding shaft; the energy of the rotating inertial energy storage unit gradually dissipates, and the speed of the hanging hammer mechanism decreases, so that the opening and closing component is closed.

[0048] If the weather is just too cold and the wind is just a breeze or no wind, the heat lost in the cooling air duct due to air flow is not much and the mechanism will not work.

[0049] In addition, a rotational inertia energy storage unit is provided between the lateral wind force mechanism and the pendant hammer mechanism, so that even if there is occasional lateral wind during normal operation of the wind turbine generator set, the lateral wind force mechanism will not easily drive the pendant hammer mechanism to close the opening and closing component due to the stationary inertia of the rotational inertia energy storage unit, thereby ensuring the normal operation of the heat dissipation system.

[0050] In this embodiment, the interior of the machine body may be equipped with structures such as a wind rotor shaft, a reducer, a generator, and a cooling system. The cooling air duct runs through the machine body from a position close to the side of the machine body in the front-to-back direction to avoid interference with parts such as the wind rotor shaft, the reducer, and the generator inside the machine body. The cooling air duct may be made of aluminum to increase the thermal conductivity. The interior of the cooling air duct is suitable for air flow, and multiple coolant pipes are coiled outside. These coolant pipes may be respectively connected to the wind rotor shaft, the reducer, the generator, etc., so that the heat of these parts can be transferred to the cooling air duct and carried away by the air flow flowing through the cooling air duct.

[0051] In order to avoid interference with the rotor shaft, reducer, generator and cooling system in the machine body, the lateral wind mechanism is usually installed at the rear of the machine body. The direction of the lateral wind mechanism is perpendicular to the front and rear direction of the machine body, so that when the machine body yaws to the point where the rotor plane is parallel to the wind direction, the lateral wind mechanism can face the wind direction, thereby reducing the force on the rotor and enabling the lateral wind mechanism to better absorb wind energy.

[0052] Rotating inertia energy storage units are mainly used to store wind energy.

[0053] The lateral wind force mechanism converts the wind force into the rotation of the output shaft and transmits it to the rotational inertia energy storage unit, so that even if the external wind force is relatively small, after a period of time, the rotational inertia energy storage unit can reach a higher speed, so that the hanging hammer mechanism drives the sliding shaft. The rotational inertia energy storage unit is connected to the output shaft of the lateral wind force mechanism through an overrunning clutch. When the external wind force is large or small, the lateral wind force mechanism can avoid the reverse drag of the rotational inertia energy storage unit. Different from the common understanding, the rotational inertia energy storage unit of this embodiment is required to have a relatively high energy dissipation, so that after the wind turbine generator set is yawed to the windward state of the wind rotor, the lateral wind force mechanism has no wind blowing, and after a relatively short period of time, the rotational inertia energy storage unit will stop rotating due to energy dissipation, so that the sliding shaft no longer drives the opening and closing assembly to open. Specifically, the rotational inertia energy storage unit can use a flywheel exposed to the air, and the surface of the flywheel can be provided with a concave-convex structure to increase the friction with the air.

[0054] The pendulum of the pendulum mechanism is hinged on the side of the rotating shaft. When the rotating shaft is stationary, the pendulum automatically droops. When the rotating shaft gradually rotates together with the rotating inertia energy storage unit, the pendulum swings upward under the action of centrifugal force.

[0055] The fixed sleeve of the low-temperature locking mechanism is fixed on the machine body, and the sliding shaft slides up and down in the fixed sleeve. The sliding shaft is connected to the hanging hammer through a pull rod, so that when the rotation speed of the hanging hammer mechanism increases, the hanging hammer drives the sliding shaft to move upward, and then drives the opening and closing component to open. The bimetallic strip and the movable clamp of the low-temperature locking mechanism are installed on the sliding shaft, and correspondingly, a groove is provided on the inner wall of the fixed sleeve. At low temperatures, the bimetallic strip bends to push the movable clamp so that the movable clamp protrudes from the sliding shaft. If the sliding shaft is driven upward by the hanging hammer to open the opening and closing component at this time, the movable clamp is clamped into the groove of the inner wall of the fixed sleeve, so that the sliding shaft will not slide down again, unless the temperature rises and the bimetallic strip drives the movable clamp to separate from the groove. The bimetallic strip is a composite material composed of two or more metals or other materials with different thermal expansion coefficients. Due to the different thermal expansion coefficients of each layer, the bimetallic strip bends as a whole when the temperature changes.

[0056] See also Figure 4 and Figure 5 As a specific implementation of the wind turbine hybrid cooling system provided by the present application, the opening and closing component includes:

[0057] A plurality of blades are distributed along the circumference of the rear end opening of the cooling air duct, and each blade is hinged to the rear end of the cooling air duct; and

[0058] A control ring is rotatably disposed at the rear end of the cooling air duct and connected to the blades through a connecting rod;

[0059] When the control ring rotates, the blades are pulled by the connecting rod, so that the plurality of blades converge to the middle to close the rear end opening of the cooling air duct, or disperse to the surroundings to open the rear end opening of the cooling air duct.

[0060] In this embodiment, the plurality of blades are controlled by the rotation of the control ring to close or open the rear end opening of the cooling air duct.

[0061] In a specific implementation, after the multiple blades are closed, there may be partial overlap between adjacent blades to improve the sealing effect. Each blade is roughly triangular in shape, with one corner hinged to the end face of the cooling air duct, another corner connected to the control ring through a connecting rod, and the third corner converging toward the center of the cooling air duct. The multiple blades are respectively hinged on the end face of the cooling air duct and rotate in the radial plane of the cooling air duct. The control ring is rotationally connected to the rear end of the cooling air duct and pulls each blade one by one through a connecting rod. For other details, please refer to the aperture structure of the camera shutter.

[0062] See also Figure 1 , 2, 4 and 5, as a specific embodiment of the hybrid cooling system of a wind turbine provided in the present application, the opening and closing component also includes a control rope, which is wound around the outer periphery of the control ring of each opening and closing component, and one end of the control rope is pulled by a tension spring, and the other end is fixed to the sliding shaft of the low-temperature locking mechanism; the tension spring pulls the control rope to cause multiple blades to disperse to the surroundings to open the rear end opening of the cooling air duct, and the sliding shaft pulls the control rope to cause multiple blades to gather in the middle to close the rear end opening of the cooling air duct.

[0063] In this embodiment, the control rope is passed around the outer circumference of the control ring of each opening and closing component, so that the control ring of each opening and closing component can be driven to rotate by pulling the two ends of the control rope, thereby controlling the opening and closing of each opening and closing component.

[0064] One end of the control rope is guided by a plurality of guide wheels and fixedly connected to the sliding shaft of the low temperature locking mechanism, so that when the sliding shaft of the low temperature locking mechanism moves upward, it can pull the control rope, and the control rope drives each control ring to rotate, thereby opening each opening and closing component, and the tension spring at the other end of the control rope is stretched. When the sliding shaft of the low temperature locking mechanism no longer pulls the control rope, the elastic force of the tension spring pulls the control rope, so that the control ring rotates to close each opening and closing component.

[0065] See also Figure 1 As a specific implementation of the hybrid cooling system for a wind turbine provided in the present application, the lateral wind mechanism includes:

[0066] The lateral air duct is arranged at the rear of the machine body and penetrates along both sides of the machine body; and

[0067] The impeller is arranged in the lateral wind duct and is drivingly connected to the output shaft of the lateral wind force mechanism.

[0068] In a specific implementation, the lateral air duct is arranged at the rear of the machine body, and runs through the left and right sides of the machine body. The impeller is installed in the lateral air duct, and drives the rotating inertia energy storage unit through the bevel gear, the transmission shaft and the overrunning clutch.

[0069] See also Figure 1 As a specific embodiment of the hybrid cooling system for a wind turbine provided in the present application, the rotational inertia energy storage unit includes a rotatably arranged mass flywheel, and the surface of the mass flywheel has a concave-convex structure to increase the friction with the ambient gas.

[0070] In a specific implementation, the concave-convex structure on the surface of the mass flywheel can be a plurality of pits or protrusions, or through holes, so that the mass flywheel stops rotating after a relatively short time without external input.

[0071] See also Figure 2As a specific implementation of the wind turbine hybrid cooling system provided in the present application, the pendulum mechanism includes two pendulums, and the two pendulums are symmetrically arranged on both sides of the rotating shaft;

[0072] An intermediate sleeve is arranged at the upper end of the sliding shaft. The intermediate sleeve is arranged for axial limiting and circumferential rotation. The intermediate sleeve is respectively connected with two hanging hammers through connecting rods.

[0073] In this embodiment, a circumferential annular groove is arranged at the upper end of the sliding shaft, and the intermediate sleeve is a two-petal structure, which is assembled and sleeved on the groove. The two ends of the connecting rod are respectively hinged to the intermediate sleeve and the suspension weight.

[0074] See also Figure 2 As a specific embodiment of the hybrid cooling system for a wind turbine provided by the present application, the sliding shaft is provided with a receiving groove, the bimetallic strip is arranged in the receiving groove along the axial direction of the sliding shaft, one end of the bimetallic strip is fixed and the other end is free to move, and the low-temperature protrusion side of the bimetallic strip faces outward;

[0075] The movable clamp is arranged in the accommodating groove, and one end is rotatably connected to the sliding shaft, and the other end is a clamping end located outside the low-temperature protrusion side of the bimetallic strip, and the low-temperature protrusion side of the bimetallic strip and the clamping end of the movable clamp are connected through a buffer spring.

[0076] In a specific implementation, the bimetallic strip is close to a straight strip at room temperature. The bimetallic strip is close to the bottom of the receiving groove, and one end of the bimetallic strip is fixed to the bottom of the receiving groove by bolts, and the other end is a free end, and the side of the bimetallic strip with a smaller thermal expansion coefficient is a low-temperature convex side, facing the notch, so that when the temperature drops, the middle part of the bimetallic strip can bulge toward the notch.

[0077] The upper end of the movable clamp is rotatably connected to the sliding shaft, and the lower end is a clamping end and is located outside the low-temperature protrusion side of the bimetallic strip, so that the clamping end of the movable clamp can be received into the receiving groove under its own weight, and can also be easily pushed out of the receiving groove by the bimetallic strip. A buffer spring is arranged between the clamping end of the movable clamp and the bimetallic strip, which can compensate for the relatively poor elasticity of the bimetallic strip itself through the deformation of the buffer spring, so that the movable clamp will not squeeze and damage the bimetallic strip.

[0078] See also Figure 1 and Figure 6 As a specific embodiment of the hybrid cooling system of a wind turbine provided in the present application, the front end opening of the cooling air duct is provided with a suspended closed window, and the suspended closed window includes a plurality of horizontal lightweight blades distributed from top to bottom, and the upper edge of each lightweight blade is rotatably connected to the cooling air duct and the lower edge is drooping, the upper and lower edges of adjacent lightweight blades overlap each other, and the lower edge of the upper lightweight blade is located on the rear side of the lower lightweight blade.

[0079] In a specific implementation, each lightweight blade is in the shape of a horizontal strip, and the upper edge is rotatably connected to the front end of the cooling air duct through a rotating shaft. Multiple lightweight blades are arranged in sequence from top to bottom, so that when there is no wind blowing into the cooling air duct, the lower edge of each lightweight blade automatically droops under the action of its own weight, and the lower edge of the upper lightweight blade fits with the upper edge of the lower lightweight blade, so that the multiple lightweight blades close the front opening of the cooling air duct. The "lightweight" of the lightweight blade means that when the wind turbine generator set is operating normally, the airflow from the front can easily blow the lightweight blade, so that the overhanging closed window will not block the airflow from entering. Specifically, the lightweight blade can be made of aluminum alloy.

[0080] From the use process, when the wind turbine is operating normally, the wind can easily blow up the lightweight blades and blow them in from the front end of the cooling duct, thereby taking away the heat of the cooling duct. When encountering bad weather, the opening and closing component will close the rear end of the cooling duct. At this time, since the air in the cooling duct cannot flow out from the rear end, the air cannot flow in from the front end in large quantities, causing each lightweight blade to automatically droop, thereby completely closing the front end of the cooling duct, thereby avoiding heat loss from the front end of the cooling duct due to air disturbances such as eddies. Moreover, in the above-mentioned weather conditions where the temperature is too low but there is only a breeze or no wind, the suspended closed window can also close the front end of the cooling duct to avoid heat loss due to air disturbances such as eddies.

[0081] See also Figure 1 As a specific embodiment of the hybrid cooling system of a wind turbine provided in the present application, heat dissipation fins are provided inside the cooling duct, and the heat dissipation fins are arranged in the front-to-back direction. The coolant pipes of the wind wheel shaft, the reducer and the generator in the machine body are all wrapped around the outside of the cooling duct.

[0082] In this embodiment, the provision of the heat dissipation fins can increase the heat dissipation efficiency of the cooling air duct without increasing the wind resistance too much. The coolant pipes of the three main heat-generating parts of the wind wheel shaft, the reducer and the generator are all wound around the outside of the cooling air duct, ensuring the heat dissipation of the entire wind turbine generator set.

[0083] In a specific implementation, a spiral groove is provided on the outside of the coolant pipe, and the coolant pipe can be spirally wound in the spiral groove on the outside of the cooling air duct and fixed to the cooling air duct by brazing to increase heat exchange efficiency.

[0084] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hybrid cooling system for a wind turbine generator, characterized in that: include: The machine body is provided with at least one cooling air duct along the front-to-back direction, a plurality of coolant pipes are wound around the outside of the cooling air duct and heat is exchanged with the cooling air duct, and an opening and closing component is provided at the rear end opening of the cooling air duct; A lateral wind force mechanism, adapted to convert the wind force on both sides of the machine body into rotation of the output shaft; A rotational inertia energy storage unit connected to the output shaft of the lateral wind force mechanism via an overrunning clutch; A pendulum mechanism, comprising a rotating shaft and a pendulum; the rotating shaft is connected to the output shaft of the rotational inertia energy storage unit; the pendulum is suspended on the side of the rotating shaft, and swings upward by centrifugal action when the rotating shaft rotates; The low-temperature locking mechanism comprises a sliding shaft, a fixed sleeve, a bimetallic strip and an active clamp; the sliding shaft is axially slidable and penetrates into the fixed sleeve; the sliding shaft is connected to the suspension weight through a pull rod so as to be pulled upward when the suspension weight swings upward; the sliding shaft is transmission-connected to the opening and closing component so as to drive the opening and closing component to open when the sliding shaft moves upward; a card slot is provided on the inner wall of the fixed sleeve, and the bimetallic strip and the active clamp are provided on the sliding shaft; the bimetallic strip senses the external temperature, and when the temperature is lower than a predetermined value, pushes the active clamp out of the side of the sliding shaft, so that after the sliding shaft drives the opening and closing component to close, the active clamp can engage with the card slot to limit the sliding shaft from sliding downward; when the temperature is higher than a predetermined value, the bimetallic strip drives the active clamp to separate from the card slot.

2. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The opening and closing assembly comprises: A plurality of blades are distributed along the circumference of the rear end opening of the cooling air duct, and each of the blades is hinged to the rear end of the cooling air duct; and A control ring, rotatably disposed at the rear end of the cooling air duct and connected to the blades via a connecting rod; When the control ring rotates, the connecting rod pulls the blades, so that the plurality of blades converge toward the middle to close the rear end opening of the cooling air duct, or disperse to the surroundings to open the rear end opening of the cooling air duct.

3. The hybrid cooling system for a wind turbine generator according to claim 2, characterized in that: The opening and closing assembly also includes a control rope, which is wound around the outer circumference of the control ring of each opening and closing assembly, and one end of the control rope is pulled by a tension spring, and the other end is fixed to the sliding shaft of the low-temperature locking mechanism; the tension spring pulls the control rope to cause the multiple blades to disperse to the surroundings to open the rear end opening of the cooling air duct, and the sliding shaft pulls the control rope to cause the multiple blades to gather in the middle to close the rear end opening of the cooling air duct.

4. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The lateral wind force mechanism comprises: A lateral air duct is provided at the rear of the machine body and penetrates along both sides of the machine body; and The impeller is arranged in the lateral wind duct and is drivingly connected to the output shaft of the lateral wind force mechanism.

5. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The rotary inertia energy storage unit comprises a rotatably arranged mass flywheel, the surface of which has a concave-convex structure to increase the friction with the ambient gas.

6. The hybrid cooling system for a wind turbine generator according to claim 4, characterized in that: The pendulum mechanism comprises two pendulums, which are symmetrically arranged on both sides of the rotating shaft; An intermediate sleeve is arranged at the upper end of the sliding shaft. The intermediate sleeve is arranged for axial limiting and circumferential rotation. The intermediate sleeve is respectively connected with the two hanging weights through connecting rods.

7. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The sliding shaft is provided with a receiving groove, the bimetallic strip is arranged in the receiving groove along the axial direction of the sliding shaft, one end of the bimetallic strip is fixed and the other end is free to move, and the low-temperature protrusion side of the bimetallic strip faces outward; The movable clamp is arranged in the accommodating groove, and one end is rotatably connected to the sliding shaft, and the other end is a clamping end located outside the low-temperature protrusion side of the bimetallic strip, and the low-temperature protrusion side of the bimetallic strip and the clamping end of the movable clamp are connected through a buffer spring.

8. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The front end opening of the cooling air duct is provided with a suspended closed window, and the suspended closed window includes a plurality of horizontal lightweight blades distributed from top to bottom, the upper edge of each lightweight blade is rotatably connected to the cooling air duct, and the lower edge is drooping, the upper and lower edges of adjacent lightweight blades overlap each other, and the lower edge of the upper lightweight blade is located on the rear side of the lower lightweight blade.

9. The hybrid cooling system for a wind turbine generator according to claim 1, characterized in that: The cooling air duct is provided with heat dissipation fins in the interior thereof, and the heat dissipation fins are arranged in the front-rear direction. The wind wheel shaft, the reducer and the coolant pipes of the generator in the machine body are all wound around the exterior of the cooling air duct.

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