Anti-evacuation hydraulic lubrication integrated system and wind generating set

Abstract

The utility model relates to an anti-evacuation hydraulic lubrication integrated system and a wind generating set. Comprising a hydraulic push rod and a first electric control switching valve, the hydraulic push rod comprises a hydraulic cylinder body and a telescopic rod, the hydraulic push rod is assembled on the top of the lubricating grease box in the axis direction of the lubricating grease box, and the extending end of the telescopic rod is directly or indirectly assembled on a piston in the box to push the piston in the box; the first electric control switching valve comprises three oil ports which are respectively used for communicating with the hydraulic pump, the hydraulic oil tank and the hydraulic push rod, and the first electric control switching valve is used for controlling the action of the telescopic rod; the hydraulic push rod is driven by the hydraulic power source and matched with the spring in the box to push the piston in the box to extrude the lubricating grease to the grease injector towards the lubricating grease outlet, and the device has the advantage of preventing the grease injector from being evacuated.

Description

Technical Field

[0001] This utility model relates to an integrated hydraulic lubrication system for preventing air evacuation and a wind turbine generator set. Background Technology

[0002] Wind turbines require a hydraulic system for yaw braking of the main bearing and a lubrication system for friction pairs. The two systems operate independently, which not only takes up a lot of space and costs a lot, but also results in serious energy waste.

[0003] Hydraulic lubrication integrated systems also exist on the market, such as the patent with authorization announcement number CN 220204219 U. This lubrication system has a grease tank with a spring piston structure, and a grease injector with a spring piston structure at the bottom of the grease tank, responsible for supplying grease to the distributor. This system does not have a pressure impeller, stirring rod, or motor. During operation, the hydraulic power of the hydraulic system serves as the hydraulic power source for the lubrication system. Hydraulic oil enters one end of the disc-shaped piston of the grease injector from the hydraulic oil tank, pushing the piston to the other end to compress the spring, forcing the grease in the spring cavity into the distributor. When not in operation, the hydraulic power is unloaded, and the piston pressure disc of the grease tank, under the action of the spring, pushes the grease into the grease injector through a one-way valve, preparing for the next grease injection into the distributor. However, the technical solution of this patent has the following problems in actual use:

[0004] Because the grease tanks in the wind power industry are very large, high-viscosity grease tends to stick to the inner wall of the grease tank during use. The grease has even worse flow performance at low temperatures. It is difficult to make the grease flow down by relying solely on the spring to push the piston. Moreover, as the grease level drops, the spring thrust decreases, making it even more difficult to push the grease into the grease injector, which can lead to grease injector cavitation failure. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide an anti-cavitation hydraulic lubrication integrated system that ensures that the grease can descend to the suction port of the grease injector. The purpose of this utility model is also to provide a wind turbine generator set equipped with the above-mentioned anti-cavitation hydraulic lubrication integrated system.

[0006] The technical solution of this utility model's anti-cavitation hydraulic lubrication integrated system is as follows:

[0007] Anti-cavitation hydraulic lubrication integrated system, including:

[0008] A grease tank is used to store grease, including an internal piston and an internal spring.

[0009] The hydraulic push rod, including a hydraulic cylinder and a telescopic rod, is assembled on the top of the grease tank along the axial direction of the grease tank. The extended end of the telescopic rod is directly or indirectly assembled on the piston inside the tank to push the piston inside the tank.

[0010] The hydraulic push rod is driven by a hydraulic power source, which pushes the piston inside the box to squeeze the grease toward the grease outlet.

[0011] The beneficial effects of this solution are as follows: Compared with the prior art, this application sets a hydraulic push rod on the grease tank, which can serve as a guide for the piston inside the tank, guiding and supporting the reciprocating motion of the piston inside the tank. It also works in conjunction with the spring inside the tank to push the piston inside the tank toward the grease outlet to squeeze the grease, overcoming the resistance of high-viscosity grease adhering to the inner wall of the tank. Under the premise of ensuring that the cost is not too high, hydraulic power is used to prevent the grease injector from being evacuated.

[0012] Furthermore, the first electrically controlled switching valve includes three oil ports, which are respectively used to connect to the hydraulic pump, the hydraulic oil tank, and the hydraulic push rod. The first electrically controlled switching valve is used to control the movement of the telescopic rod. The valve position switching time of the first electrically controlled switching valve is controllable. When the grease injector is full of grease, the valve position is switched in time to unload and reduce hydraulic power loss.

[0013] Furthermore, the system includes a grease injector and a second electrically controlled switching valve. The grease injector has a hydraulic inlet, and the second electrically controlled switching valve has three ports, which are respectively used to connect to a hydraulic pump, a hydraulic tank, and the hydraulic inlet. When switching valve positions, the grease injector is connected to the hydraulic pump or the hydraulic tank. The second and first electrically controlled switching valves can work together. When the second electrically controlled switching valve switches to the position where the hydraulic pump is connected to the grease injector, the first electrically controlled switching valve switches valve positions to unload the system. This prevents the hydraulic power source from driving the hydraulic push rod to move when the grease injector supplies grease to the distributor, causing grease to enter the grease injector and hindering the plunger's movement. This improves the controllability of grease discharge and reduces hydraulic power waste.

[0014] Furthermore, the hydraulic push rod has one or at least two stages of telescopic rods.

[0015] Furthermore, the top cover of the grease tank and the piston inside the tank are respectively provided with threaded holes, and the hydraulic cylinder body and the extension end of the telescopic rod are respectively provided with corresponding external threads. The top cover of the grease tank and the hydraulic cylinder body, and the extension end of the telescopic rod and the piston inside the tank are all connected by threads.

[0016] Furthermore, a relief valve is provided between the first electrically controlled switching valve and the hydraulic oil tank. When the pressure in the hydraulic oil pipeline reaches the set value, the hydraulic oil can flow back to the hydraulic oil tank through the relief valve to prevent overpressure.

[0017] The technical solution of this utility model for a wind turbine generator set is as follows:

[0018] Wind turbine generator sets include an anti-cavitation hydraulic lubrication integrated system, which includes:

[0019] Anti-cavitation hydraulic lubrication integrated system, including:

[0020] A grease tank is used to store grease, including an internal piston and an internal spring.

[0021] The hydraulic push rod, including a hydraulic cylinder and a telescopic rod, is assembled on the top of the grease tank along the axial direction of the grease tank. The extended end of the telescopic rod is directly or indirectly assembled on the piston inside the tank to push the piston inside the tank.

[0022] The hydraulic push rod is driven by a hydraulic power source, which pushes the piston inside the box to squeeze the grease toward the grease outlet.

[0023] The beneficial effects of this solution are as follows: Compared with the prior art, this application sets a hydraulic push rod on the grease tank, which can serve as a guide for the piston inside the tank, guiding and supporting the reciprocating motion of the piston inside the tank. It also works in conjunction with the spring inside the tank to push the piston inside the tank toward the grease outlet to squeeze the grease, overcoming the resistance of high-viscosity grease adhering to the inner wall of the tank. Under the premise of ensuring that the cost is not too high, hydraulic power is used to prevent the grease injector from being evacuated.

[0024] Furthermore, the first electrically controlled switching valve includes three oil ports, which are respectively used to connect to the hydraulic pump, the hydraulic oil tank, and the hydraulic push rod. The first electrically controlled switching valve is used to control the movement of the telescopic rod. The valve position switching time of the first electrically controlled switching valve is controllable. When the grease injector is full of grease, the valve position is switched in time to unload and reduce hydraulic power loss.

[0025] Furthermore, the system includes a grease injector and a second electrically controlled switching valve. The grease injector has a hydraulic inlet, and the second electrically controlled switching valve has three ports, which are respectively used to connect to a hydraulic pump, a hydraulic tank, and the hydraulic inlet. When switching valve positions, the grease injector is connected to the hydraulic pump or the hydraulic tank. The second and first electrically controlled switching valves can work together. When the second electrically controlled switching valve switches to the position where the hydraulic pump is connected to the grease injector, the first electrically controlled switching valve switches valve positions to unload the system. This prevents the hydraulic power source from driving the hydraulic push rod to move when the grease injector supplies grease to the distributor, causing grease to enter the grease injector and hindering the plunger's movement. This improves the controllability of grease discharge and reduces hydraulic power waste.

[0026] Furthermore, the hydraulic push rod has one or at least two stages of telescopic rods.

[0027] Furthermore, the top cover of the grease tank and the piston inside the tank are respectively provided with threaded holes, and the hydraulic cylinder body and the extension end of the telescopic rod are respectively provided with corresponding external threads. The top cover of the grease tank and the hydraulic cylinder body, and the extension end of the telescopic rod and the piston inside the tank are all connected by threads.

[0028] Furthermore, a relief valve is provided between the first electrically controlled switching valve and the hydraulic oil tank. When the pressure in the hydraulic oil pipeline reaches the set value, the hydraulic oil can flow back to the hydraulic oil tank through the relief valve to prevent overpressure. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the principle of Embodiment 1 of the anti-cavitation hydraulic lubrication integrated system of this utility model;

[0030] Figure 2 for Figure 1 A cross-sectional schematic diagram of one embodiment of region A in the middle;

[0031] Figure 3 This is a cross-sectional view of the internal structure of the grease injector;

[0032] In the diagram: 1-Hydraulic oil tank, 2-Hydraulic pump, 3-Motor, 4-Manual pump, 5-Filter, 6-Air filter, 7-Relief valve, 8-Stop valve, 9-Pressure gauge, 10-Accumulator, 11-Pressure sensor, 12-Pressure reducing valve, 13-Check valve, 131-Small spring, 132-Valve core, 133-Port, 14-Third electrically controlled switching valve, 15-Second electrically controlled switching valve, 16-Hydraulic actuator, 17-Grease injector, 171-Valve body, 1711-Hydraulic oil inlet, 1712-Grease inlet, 1713-Grease outlet, 1714- 1715 - Large diameter cavity, 172 - Small diameter cavity, 1721 - Piston, 1722 - Large diameter section, 1723 - Sealing groove, 173 - Return spring, 174 - Sealing ring, 175 - Threaded pipe fitting, 176 - Plug, 18 - Distributor, 19 - Grease tank, 191 - Spring inside the tank, 192 - Piston inside the tank, 193 - Threaded hole, 194 - Grease outlet, 20 - Pressure switch, 21 - Hydraulic push rod, 211 - Hydraulic cylinder body, 212 - Hydraulic cavity, 213 - Hydraulic oil port, 214 - Telescopic rod, 22 - First electric control switching valve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0037] Example 1 of the anti-cavitation hydraulic lubrication integrated system of this utility model: The anti-cavitation hydraulic lubrication integrated system is part of a wind turbine generator set and is installed inside the wind turbine, such as... Figure 1 As shown, the anti-cavitation hydraulic lubrication integrated system mainly includes a hydraulic oil tank 1, an air filter 6, a hydraulic pump 2, a motor 3, a check valve 13, a manual pump 4, a pressure gauge 9, a pressure test connector, an accumulator 10, a filter 5, a relief valve 7, a pressure sensor 11, a shut-off valve 8, a third electrically controlled switching valve 14, a second electrically controlled switching valve 15, a pressure reducing valve 12, a pressure switch 20, a grease injector 17, a distributor 18, and a grease tank 19. The interface components with this system include a hydraulic actuator 16 and lubrication pipelines and connectors. The hydraulic module provides power to the hydraulic actuator 16; in this embodiment, it is a high-speed shaft brake.

[0038] Among them, such as Figure 1 As shown, hydraulic pump 2 is a gear pump driven by motor 3 and controlled by the system. It is used to draw hydraulic oil from the hydraulic oil tank. Hydraulic oil tank 1 is used to store hydraulic oil. Grease tank 19 is used to store grease. It is cylindrical in shape and has an internal spring 191 and an internal piston 192. The internal spring 191 compresses the internal piston 192, which squeezes the grease towards the grease outlet 194 and into the grease injector 17.

[0039] like Figure 2 As shown, the hydraulic push rod 21 includes a hydraulic cylinder body 211, a hydraulic chamber 212, a hydraulic port 213, and a telescopic rod 214. Figure 2As shown, the hydraulic push rod 21 is mounted on the top of the grease tank 19 along the axial direction of the grease tank 19. The extended end of the telescopic rod 214 is directly or indirectly mounted on the piston 192 inside the tank to push the piston 192. The hydraulic push rod 21 is driven by a hydraulic power source, pushing the piston 192 inside the tank towards the grease outlet 194 to squeeze the grease. The top cover of the grease tank 19 and the piston 192 inside the tank are respectively provided with threaded holes, and the extended ends of the hydraulic cylinder 211 and the telescopic rod 214 are respectively provided with corresponding external threads. The top cover of the grease tank 19 and the hydraulic cylinder 211, and the extended end of the telescopic rod 214 and the piston 192 inside the tank are all connected by threads. In this embodiment, the hydraulic push rod 21 has a multi-stage telescopic rod 214.

[0040] like Figure 1 As shown, the first electrically controlled switching valve 22 is a solenoid three-way valve with three ports. These ports are connected to the hydraulic pump 2, the hydraulic oil tank 1, and the hydraulic oil port 213, respectively. The first electrically controlled switching valve 22 is used to control the movement of the telescopic rod 214. The valve position switching time of the first electrically controlled switching valve 22 is controllable. When the grease injector 17 is filled with grease, the first electrically controlled switching valve 22 promptly switches its valve position to unload, reducing hydraulic power waste. A relief valve 7 is installed between the first electrically controlled switching valve 22 and the hydraulic oil tank 1. When the pressure in the hydraulic oil line reaches a set value, the relief valve 7 can release pressure to prevent overpressure.

[0041] like Figure 3As shown, in this embodiment, the one-way valve 13 of the grease injector 17 shares a valve body 171 with the grease injector 17. The valve body 171 has a valve cavity, and a return spring 173 is provided within the valve cavity. The valve cavity has a hydraulic inlet 1711, a grease inlet 1712, and a grease outlet 1713. A plunger 172 is slidably sealed within the valve cavity. The plunger 172 includes a large-diameter section 1721 and a small-diameter section 1722. The valve cavity includes a large-diameter cavity 1714 and a small-diameter cavity 1715 corresponding to the large-diameter section 1721 and the small-diameter section 1722. The return spring 173 is sleeved on the small-diameter cavity. On the large-diameter section 1722, one end of the return spring 173 abuts against the large-diameter section 1721, and the other end abuts against the valve body 171 to provide elastic return force to the plunger 172. The hydraulic inlet 1711 is located at the outer end of the large-diameter cavity 1714, the grease inlet 1712 is located at the end of the small-diameter cavity 1715 near the return spring 173, and the grease outlet 1713 is located at the end of the small-diameter cavity 1715 away from the return spring 173. When the hydraulic oil pushes the plunger 172, it squeezes the grease in the small-diameter cavity 1715 towards the grease outlet 1713 and the grease inlet 1712. When the front end of the small-diameter section 1722 blocks the grease inlet 1712, the grease only flows out from the grease outlet 1713. The grease outlet 1713 is connected to a one-way outward-directing check valve 13. The one-way valve 13 at the grease outlet 1713 prevents grease from flowing back into the valve body 171 when the plunger 172 moves away from the grease outlet 1713, ensuring that the grease in the grease tank 19 is smoothly replenished into the valve cavity. This plunger structure can achieve better sealing when subjected to hydraulic oil pressure.

[0042] like Figure 1 As shown, the second electrically controlled switching valve 15 is a solenoid three-way valve, including three oil ports, which are respectively connected to the hydraulic pump 2, the hydraulic oil tank 1, and the hydraulic inlet 1711. During grease supply, the second electrically controlled switching valve 15 switches to connect the hydraulic pump 2 to the grease injector 17, providing power for the plunger action of the grease injector 17. When grease is not supplied, the second electrically controlled switching valve 15 switches to connect the grease injector 17 to the hydraulic oil tank 1 for unloading, and the grease tank 19 squeezes grease into the cavity of the grease injector 17, preparing for the next grease supply. A one-way valve 13 is provided between the second electrically controlled switching valve 15 and the hydraulic oil tank 1, guiding towards the oil tank. The one-way valve 13 is set up here mainly to prevent hydraulic oil that should flow to the hydraulic oil tank 1 from entering the hydraulic oil inlet 1711 through the second electronically controlled switching valve 15 and pushing the plunger 172 to move when the hydraulic actuator 16 is unloaded after working. This avoids the plunger 172 from working during non-working time and improves the controllability of grease discharge.

[0043] The first electrically controlled switching valve 22 and the second electrically controlled switching valve 15 can work together. When the second electrically controlled switching valve 15 switches to the position where the hydraulic pump 2 is connected to the grease injector 17, the first electrically controlled switching valve 22 switches to the valve position to unload, preventing the hydraulic power source from driving the hydraulic push rod 21 to move when the grease injector 17 supplies grease to the distributor 18, thus preventing grease from entering the grease injector 17 and interfering with the plunger action. This improves the controllability of grease discharge and reduces hydraulic power waste.

[0044] The third electrically controlled switching valve 14 is a solenoid three-way valve, including three oil ports. The three oil ports are respectively connected to the hydraulic pump 2, the hydraulic oil tank 1, and the hydraulic actuator 16. When switching the valve position, the hydraulic actuator 16 is connected to the hydraulic pump 2 or the hydraulic oil tank 1. That is, when hydraulic braking is applied, the valve switches to connect the hydraulic pump 2 to the hydraulic actuator 16 to provide power for the action of the hydraulic actuator 16. When braking is not applied, the valve switches to connect the hydraulic actuator 16 to the hydraulic oil tank 1 to unload.

[0045] Example 2 of the anti-cavitation hydraulic lubrication integrated system of this utility model: The difference from Example 1 is that the one-way valve 13 and the grease injector 17 are separate units, and their structure is existing technology, which will not be described in detail here.

[0046] Specific embodiments of the wind turbine generator set of this utility model: The wind turbine generator set includes the anti-cavitation hydraulic lubrication integrated system as described in the above embodiments and other components. The structure of the other components is prior art and will not be described in detail.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. Anti-cavitation hydraulic lubrication integrated system, including: A grease tank is used to store grease, including an internal piston and an internal spring. Its characteristic is that it further includes: The hydraulic push rod includes a hydraulic cylinder and a telescopic rod. The hydraulic push rod is assembled on the top of the grease tank along the axial direction of the grease tank. The extended end of the telescopic rod is directly or indirectly assembled on the piston inside the tank to push the piston inside the tank. The hydraulic push rod is driven by a hydraulic power source, which pushes the piston inside the box to squeeze the grease toward the grease outlet.

2. The anti-cavitation hydraulic lubrication integrated system according to claim 1, characterized in that, It includes a first electrically controlled switching valve, which has three oil ports. The three oil ports are respectively used to connect to the hydraulic pump, the hydraulic oil tank and the hydraulic push rod. The first electrically controlled switching valve is used to control the movement of the telescopic rod.

3. The anti-cavitation hydraulic lubrication integrated system according to claim 2, characterized in that, It includes a grease injector and a second electrically controlled switching valve. The grease injector has a hydraulic inlet, and the second electrically controlled switching valve has three ports, which are respectively used to connect to a hydraulic pump, a hydraulic tank, and a hydraulic inlet. When switching the valve position, the grease injector is connected to the hydraulic pump or the hydraulic tank.

4. The anti-cavitation hydraulic lubrication integrated system according to claim 1, characterized in that, The hydraulic push rod has one or at least two telescopic rods.

5. The anti-cavitation hydraulic lubrication integrated system according to claim 1, characterized in that, The top cover of the grease tank and the piston inside the tank are respectively provided with threaded holes, and the hydraulic cylinder body and the extension end of the telescopic rod are respectively provided with corresponding external threads. The top cover of the grease tank and the hydraulic cylinder body, and the extension end of the telescopic rod and the piston inside the tank are all connected by threads.

6. The anti-cavitation hydraulic lubrication integrated system according to claim 2, characterized in that, An overflow valve is provided between the first electrically controlled switching valve and the hydraulic oil tank.

7. A wind turbine generator set, characterized in that, Including the anti-cavitation hydraulic lubrication integrated system as described in any one of claims 1-6.

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