Hydraulic lubrication integrated system and wind generating set

Abstract

The utility model relates to a hydraulic lubrication integrated system and a wind generating set. Only a hydraulic oil inlet, a grease inlet and a grease outlet are formed in a valve body of the grease injector, a plunger of the grease injector is assembled in a valve cavity of the grease injector in a sliding and sealing mode, the plunger comprises a large-diameter section and a small-diameter section, the valve cavity comprises a large-diameter cavity and a small-diameter cavity which correspond to the large-diameter section and the small-diameter section, the small-diameter section is sleeved with a reset spring, and the reset spring is arranged in the large-diameter cavity. One end of the reset spring is matched with the large-diameter section in an abutting mode, the other end of the reset spring is matched with the valve body in an abutting mode so as to provide elastic reset force for the plunger, the hydraulic oil inlet is formed in the outer end of the large-diameter cavity, the grease inlet is formed in the end, close to the reset spring, of the small-diameter cavity, and the grease outlet is formed in the end, away from the reset spring, of the small-diameter cavity. When hydraulic oil pushes the plunger to move, lubricating grease in the small-diameter cavity is squeezed towards the grease outlet and the grease inlet, and after the grease inlet is blocked by the front end of the small-diameter section, the lubricating grease only flows out of the grease outlet. The oil injector has the advantages of lower cost, simpler structure and difficulty in mixed pollution of media on two sides of the oil injector.

Description

Technical Field

[0001] This utility model relates to a hydraulic lubrication integrated system 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. However, the transmission medium used in the hydraulic system is hydraulic oil (thin oil), while the lubrication medium used in the lubrication system is grease (thick oil). The media are completely different. Traditionally, the two systems are separated and operate independently. The lubrication system requires an electric pump or hydraulic pump, along with a transmission mechanism, plunger pair, etc. This results in two systems that not only occupy a large volume and have high cost, but also waste energy significantly.

[0003] Hydraulic lubrication integrated systems also exist on the market, such as the patent with authorization announcement number CN 220204219 U. This system utilizes the power of a hydraulic system to drive the lubrication system. Through an oil injector with a spring-piston structure, hydraulic power enters from one end of a disc-shaped piston, pushing the piston to the other end to compress the spring and squeeze out the grease from the spring chamber. Because a one-way valve is installed between the oil injector and the oil tank, the grease can only flow unidirectionally from the oil tank to the oil injector, ensuring that the grease in the spring chamber, when squeezed, can only enter the distributor. However, this patented technical solution has the following problems in actual use:

[0004] 1. Because the lubricator uses a disc-shaped piston structure, the left side of the piston contains hydraulic oil and the right side contains lubricating grease. The hydraulic oil has a high pressure and is prone to leakage from the seal of the disc-shaped piston structure, resulting in the two media mixing and contamination.

[0005] 2. The lubricator usually needs to be installed at the lower interface of the oil tank. Due to space limitations, it is inconvenient to install a check valve, and the check valve is also expensive.

[0006] 3. This system structure can only be lubricated using progressive distributors and is not suitable for single-line distributors, thus limiting its application range. Utility Model Content

[0007] Based on this, the purpose of this utility model is to provide a hydraulic lubrication integrated system with lower cost, simpler structure, and larger sealing area to ensure that the medium on both sides of the oiler is not easily mixed and contaminated; the purpose of this utility model is also to provide a wind turbine generator set equipped with the above-mentioned hydraulic lubrication integrated system.

[0008] The technical solution of the hydraulic lubrication integrated system of this utility model is as follows: The hydraulic lubrication integrated system includes:

[0009] Hydraulic oil tank, used to store hydraulic oil;

[0010] Grease tank, used to store lubricating grease;

[0011] Hydraulic pump and motor, used to draw hydraulic oil from hydraulic oil tank;

[0012] 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 actuator. When switching the valve position, the hydraulic actuator is connected to the hydraulic pump or the hydraulic oil tank.

[0013] The grease injector includes a valve body, a valve cavity inside the valve body, a return spring inside the valve cavity, and the valve cavity has a hydraulic oil inlet, a grease inlet, and a grease outlet.

[0014] The second electrically controlled switching valve includes three oil ports, which are respectively connected to the hydraulic pump, the hydraulic oil tank and the hydraulic oil inlet.

[0015] A plunger with a sliding seal is assembled in the valve cavity. The plunger includes a large-diameter section and a small-diameter section. The valve cavity includes a large-diameter cavity and a small-diameter cavity corresponding to the large-diameter section and the small-diameter section. The return spring is sleeved on the small-diameter section. One end of the return spring abuts against the large-diameter section and the other end abuts against the valve body to provide elastic return force to the plunger. The hydraulic oil inlet is located at the outer end of the large-diameter cavity, the grease inlet is located at the end of the small-diameter cavity near the return spring, and the grease outlet is located at the end of the small-diameter cavity away from the return spring.

[0016] When the hydraulic oil pushes the plunger to move, it squeezes the grease in the small-diameter cavity toward the grease outlet and grease inlet. When the grease inlet is blocked at the front end of the small-diameter section, the grease flows out only from the grease outlet.

[0017] The beneficial effects of this solution are as follows: Compared with the prior art, this application sets the grease injector as a plunger structure instead of a traditional piston structure. Utilizing the longer axial length of the plunger, better sealing can be achieved. The longer the plunger, the greater the distance the thin oil can leak when subjected to fluid pressure from both sides, especially hydraulic oil pressure. The resistance to overcome is also greater. In other words, for narrow gaps, increasing the length of the gap can achieve better sealing. Traditional pistons are generally disc-shaped structures, using rubber sealing rings on the outer circumference of the disc for sealing. This not only has a short sealing distance, but also, because it uses elastic sealing rings, the sealing rings are easily damaged under high pressure. Therefore, the traditional piston structure easily leads to sealing failure, allowing hydraulic oil to enter the grease and contaminating it. If the lubricant cannot continue to function properly due to contamination, the plunger of this application is made of a long and hard metal material. The outer circumferential surface of the metal plunger and the inner metal wall of the valve cavity achieve a seal, which can withstand high pressure for a long time without damage. On the other hand, this application utilizes the relative positional relationship between the plunger and the grease inlet. By positioning the grease inlet at the beginning of the plunger's grease-squeezing movement, the plunger can block and seal the grease inlet after moving a short distance, thereby isolating the valve cavity from the grease tank. This allows the grease to be discharged only from the grease outlet, eliminating the need for a one-way valve between the grease tank and the grease inlet. This saves on components such as a one-way valve and two connectors. Furthermore, by eliminating the one-way valve, the grease inlet of the grease injector can be directly connected to the outlet of the grease tank without pipes, saving on oil pipes and connectors. The overall layout is more compact, saving volume and reducing costs, achieving multiple benefits.

[0018] Furthermore, the grease outlet is connected to a one-way outward-directing check valve. The check valve at the grease outlet prevents grease from flowing back into the valve body when the plunger moves away from the grease outlet, ensuring that the grease in the grease tank is smoothly replenished into the valve cavity.

[0019] Furthermore, the check valve and the grease injector share the same valve body. This structural design is more compact and saves on oil pipes and fittings, thus reducing costs.

[0020] Furthermore, the grease outlet is connected to a distributor via the main oil pipe, and the distributor is connected to the parts of the equipment to be lubricated via branch pipes.

[0021] Furthermore, the distributor is a single-line distributor, with an overflow valve between the main oil pipe and the grease tank, and a pressure switch on the main oil pipe.

[0022] Furthermore, a check valve is provided between the second electrically controlled switching valve and the hydraulic oil tank, which flows towards the oil tank. The main purpose of this check valve is to prevent hydraulic oil that should flow to the hydraulic oil tank from entering the hydraulic inlet through the second electrically controlled switching valve and pushing the plunger when the hydraulic actuator is unloaded after operation, thus avoiding the plunger working during non-working hours and improving the controllability of grease discharge.

[0023] Furthermore, the position furthest from the grease outlet to the plunger is defined as the grease inlet limit position. When the plunger is at the grease inlet limit position, the minimum distance between the axis of the grease inlet and the plunger is not less than 1mm. The purpose of this setting is mainly to prevent the plunger from accidentally blocking the grease inlet when it fails to return to its original position under the action of the return spring. Leaving a certain distance can minimize the possibility of the plunger failing to return to its original position, thus preventing the grease from entering the inlet smoothly.

[0024] Furthermore, a sealing groove is provided on the small-diameter section, and a sealing ring is installed in the sealing groove. By utilizing the rigid gap between the small-diameter section and the inner wall of the small-diameter cavity for sealing, and by adding a sealing ring as a flexible seal, a better sealing effect can be achieved through the combination of the two.

[0025] Furthermore, the grease injector is installed at the bottom of the grease tank. One of the outlets of the grease tank and the inlet of the grease injector is a threaded hole, and the other is a threaded tube, which are connected by threads. This structure is more compact, saves on oil pipes and fittings, and reduces costs.

[0026] Furthermore, the first and second electrically controlled switching valves are three-way solenoid valves.

[0027] The technical solution of this utility model for a wind turbine generator set is as follows: The wind turbine generator set includes a hydraulic lubrication integrated system, which includes:

[0028] Hydraulic oil tank, used to store hydraulic oil;

[0029] Grease tank, used to store lubricating grease;

[0030] Hydraulic pump and motor, used to draw hydraulic oil from hydraulic oil tank;

[0031] 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 actuator. When switching the valve position, the hydraulic actuator is connected to the hydraulic pump or the hydraulic oil tank.

[0032] The grease injector includes a valve body, a valve cavity inside the valve body, a return spring inside the valve cavity, and the valve cavity has a hydraulic oil inlet, a grease inlet, and a grease outlet.

[0033] The second electrically controlled switching valve includes three oil ports, which are respectively connected to the hydraulic pump, the hydraulic oil tank and the hydraulic oil inlet.

[0034] A plunger with a sliding seal is assembled in the valve cavity. The plunger includes a large-diameter section and a small-diameter section. The valve cavity includes a large-diameter cavity and a small-diameter cavity corresponding to the large-diameter section and the small-diameter section. The return spring is sleeved on the small-diameter section. One end of the return spring abuts against the large-diameter section and the other end abuts against the valve body to provide elastic return force to the plunger. The hydraulic oil inlet is located at the outer end of the large-diameter cavity, the grease inlet is located at the end of the small-diameter cavity near the return spring, and the grease outlet is located at the end of the small-diameter cavity away from the return spring.

[0035] When the hydraulic oil pushes the plunger to move, it squeezes the grease in the small-diameter cavity toward the grease outlet and grease inlet. When the grease inlet is blocked at the front end of the small-diameter section, the grease flows out only from the grease outlet.

[0036] The beneficial effects of this solution are as follows: Compared with the prior art, this application sets the grease injector as a plunger structure instead of a traditional piston structure. Utilizing the longer axial length of the plunger, better sealing can be achieved. The longer the plunger, the greater the distance the thin oil can leak when subjected to fluid pressure from both sides, especially hydraulic oil pressure. The resistance to overcome is also greater. In other words, for narrow gaps, increasing the length of the gap can achieve better sealing. Traditional pistons are generally disc-shaped structures, using rubber sealing rings on the outer circumference of the disc for sealing. This not only has a short sealing distance, but also, because it uses elastic sealing rings, the sealing rings are easily damaged under high pressure. Therefore, the traditional piston structure easily leads to sealing failure, allowing hydraulic oil to enter the grease and contaminating it. If the lubricant cannot continue to function properly due to contamination, the plunger of this application is made of a long and hard metal material. The outer circumferential surface of the metal plunger and the inner metal wall of the valve cavity achieve a seal, which can withstand high pressure for a long time without damage. On the other hand, this application utilizes the relative positional relationship between the plunger and the grease inlet. By positioning the grease inlet at the beginning of the plunger's grease-squeezing movement, the plunger can block and seal the grease inlet after moving a short distance, thereby isolating the valve cavity from the grease tank. This allows the grease to be discharged only from the grease outlet, eliminating the need for a one-way valve between the grease tank and the grease inlet. This saves on components such as a one-way valve and two connectors. Furthermore, by eliminating the one-way valve, the grease inlet of the grease injector can be directly connected to the outlet of the grease tank without pipes, saving on oil pipes and connectors. The overall layout is more compact, saving volume and reducing costs, achieving multiple benefits.

[0037] Furthermore, the grease outlet is connected to a one-way outward-directing check valve. The check valve at the grease outlet prevents grease from flowing back into the valve body when the plunger moves away from the grease outlet, ensuring that the grease in the grease tank is smoothly replenished into the valve cavity.

[0038] Furthermore, the check valve and the grease injector share the same valve body. This structural design is more compact and saves on oil pipes and fittings, thus reducing costs.

[0039] Furthermore, the grease outlet is connected to a distributor via the main oil pipe, and the distributor is connected to the parts of the equipment to be lubricated via branch pipes.

[0040] Furthermore, the distributor is a single-line distributor, with an overflow valve between the main oil pipe and the grease tank, and a pressure switch on the main oil pipe.

[0041] Furthermore, a check valve is provided between the second electrically controlled switching valve and the hydraulic oil tank, which flows towards the oil tank. The main purpose of this check valve is to prevent hydraulic oil that should flow to the hydraulic oil tank from entering the hydraulic inlet through the second electrically controlled switching valve and pushing the plunger when the hydraulic actuator is unloaded after operation, thus avoiding the plunger working during non-working hours and improving the controllability of grease discharge.

[0042] Furthermore, the position furthest from the grease outlet to the plunger is defined as the grease inlet limit position. When the plunger is at the grease inlet limit position, the minimum distance between the axis of the grease inlet and the plunger is not less than 1mm. The purpose of this setting is mainly to prevent the plunger from accidentally blocking the grease inlet when it fails to return to its original position under the action of the return spring. Leaving a certain distance can minimize the possibility of the plunger failing to return to its original position, thus preventing the grease from entering the inlet smoothly.

[0043] Furthermore, a sealing groove is provided on the small-diameter section, and a sealing ring is installed in the sealing groove. By utilizing the rigid gap between the small-diameter section and the inner wall of the small-diameter cavity for sealing, and by adding a sealing ring as a flexible seal, a better sealing effect can be achieved through the combination of the two.

[0044] Furthermore, the grease injector is installed at the bottom of the grease tank. One of the outlets of the grease tank and the inlet of the grease injector is a threaded hole, and the other is a threaded tube, which are connected by threads. This structure is more compact, saves on oil pipes and fittings, and reduces costs.

[0045] Furthermore, the first and second electrically controlled switching valves are three-way solenoid valves. Attached Figure Description

[0046] Figure 1 This is a schematic diagram illustrating the principle of Embodiment 1 of the hydraulic lubrication integrated system of this utility model;

[0047] Figure 2 for Figure 1 A schematic diagram of the lubrication module.

[0048] Figure 3 This is a cross-sectional view of the internal structure of the grease injector;

[0049] Figure 4 This is a schematic diagram of the lubrication module in Embodiment 2 of the hydraulic lubrication integrated system of this utility model;

[0050] In the diagram: 1-Hydraulic oil tank, 2-Hydraulic pump, 3-Motor, 4-Manual pump, 5-Filter, 6-Air filter, 7-Relief valve, 8-Throttle 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-First electrically controlled switching valve, 15-Second electrically controlled switching valve, 16-Hydraulic actuator, 17-Grease injector, 171-Valve body, 1711- Hydraulic inlet, 1712-Grease inlet, 1713-Grease outlet, 1714-Large diameter cavity, 1715-Small diameter cavity, 172-Plunger, 1721-Large diameter section, 1722-Small diameter section, 1723-Sealing groove, 173-Return spring, 174-Sealing ring, 175-Threaded pipe fitting, 176-Plug, 181-Single-line distributor, 182-Progressive distributor, 19-Grease tank, 191-Inner spring, 192-Inner piston, 20-Pressure switch. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0055] Embodiment 1 of the hydraulic lubrication integrated system of this utility model: The hydraulic lubrication integrated system is part of a three-unit wind turbine generator and is installed inside the wind turbine, such as... Figure 1 As shown, the 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 throttle valve 8, a first 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 relief valve 7, a single-line distributor 181, and a grease tank 19. The interface components with this system include a hydraulic actuator 1628 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. The lubrication module in this embodiment uses a single-line distributor 181 for lubrication distribution.

[0056] Among them, such as Figure 1 As shown, hydraulic pump 2 is a gear pump, driven by motor 3 and controlled by the system, used to draw hydraulic oil from the oil tank storing hydraulic oil. Hydraulic oil tank 1 is used to store hydraulic oil.

[0057] The 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, and the internal piston 192 compresses the grease below so that it can flow out from the outlet.

[0058] like Figure 1 As shown, the first electrically controlled switching valve 14 is a solenoid three-way valve, including three oil ports. These three ports are respectively connected to the hydraulic pump 2, the hydraulic oil tank 1, and the hydraulic actuator 16. When switching valve positions, the hydraulic actuator 16 is connected to either the hydraulic pump 2 or the hydraulic oil tank 1. That is, during hydraulic braking, the valve switches to connect the hydraulic pump 2 to the hydraulic actuator 16, providing power for the operation of the hydraulic actuator 16. When not braking, the valve switches to connect the hydraulic actuator 16 to the hydraulic oil tank 1 for unloading. The second electrically controlled switching valve 15 is also a solenoid three-way valve, including three oil ports. These three ports are respectively connected to the hydraulic pump 2, the hydraulic oil tank 1, and the hydraulic inlet 1711.

[0059] like Figure 3As shown, the grease injector 17 includes a valve body 171, a valve cavity within the valve body 171, and a return spring 173 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 and sealingly assembled 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, respectively. Spring 173 is fitted onto small-diameter section 1722. One end of the return spring 173 abuts against large-diameter section 1721, and the other end abuts against valve body 171 to provide elastic return force to plunger 172. Hydraulic oil inlet 1711 is located at the outer end of large-diameter cavity 1714, grease inlet 1712 is located at the end of small-diameter cavity 1715 near return spring 173, and grease outlet 1713 is located at the end of small-diameter cavity 1715 away from return spring 173. When hydraulic oil pushes plunger 172 to move, it squeezes the grease in small-diameter cavity 1715 toward grease outlet 1713 and grease inlet 1712. When the front end of small-diameter section 1722 blocks grease inlet 1712, grease only flows out from grease outlet 1713.

[0060] Grease outlet 1713 is connected to a one-way outward-directing check valve 13. The check valve 13 at grease outlet 1713 prevents grease from flowing back into valve body 171 when plunger 172 moves away from grease outlet 1713, ensuring that grease in grease tank 19 is smoothly replenished into valve cavity. Figure 3 As shown, the one-way valve 13 and the grease injector 17 share a valve body 171. This structural design is more compact and saves on oil pipes and connectors, thus reducing costs. The one-way valve 13 is located at one end of the grease outlet 1713 of the grease injector 17. When the grease flows out, it first pushes open the valve core 132 of the one-way valve 13 and compresses the small spring 131, then flows from the radial grease outlet 1713 to the single-line distributor 181. After the grease is dispensed, under the action of the small spring 131, the valve core 132 is pushed back to its original position, blocking the passage to the grease outlet 1713. Figure 3 As shown, a sealing groove 1723 is provided on the small diameter section 1722, and a sealing ring 174 is installed in the sealing groove 1723. Under the premise of using the rigid gap between the small diameter section 1722 and the inner wall of the small diameter cavity 1715 for sealing, the sealing ring 174 is set as a flexible seal. The combination of the two can achieve a better sealing effect.

[0061] Grease outlet 1713 is connected to a distributor via the main oil pipe. The distributor is connected to the parts of the equipment to be lubricated via branch pipes. The distributor is a single-line distributor 181. An overflow valve 7 is installed between the main oil pipe and the grease tank 19. A pressure switch 20 is installed on the main oil pipe. Since the single-line distributor 181 needs to be unloaded, it can only switch valve positions after reaching a set pressure. Therefore, the pressure switch 20 and the overflow valve 7 are provided to adapt to it.

[0062] like Figure 1 As shown, a one-way valve 13 is provided between the second electrically controlled switching valve 15 and the hydraulic oil tank 1, which flows towards the oil tank. The one-way valve 13 is mainly designed to prevent hydraulic oil that should flow to the hydraulic oil tank 1 from entering the hydraulic inlet 1711 through the second electrically controlled switching valve 15 and pushing the plunger 172 when the hydraulic actuator 16 is unloaded after operation, thus avoiding the plunger 172 from working during non-working hours and improving the controllability of grease discharge.

[0063] The position furthest from the grease outlet 1713 to the plunger 172 is defined as the grease inlet limit position. When the plunger is at the grease inlet limit position, the minimum distance between the axis of the grease inlet 1712 and the plunger 172 is not less than 1mm. The purpose of this setting is mainly to prevent the plunger 172 from accidentally blocking the grease inlet 1712 if it fails to return to its original position under the action of the return spring 173. Leaving a certain distance can minimize the possibility of the plunger 172 failing to return to its original position, thus preventing the grease inlet 1712 from entering smoothly.

[0064] In this embodiment, the grease injector 17 is installed at the lower part of the grease tank 19. One of the outlet of the grease tank 19 and the grease inlet 1712 of the grease injector 17 is a threaded hole, and the other is a threaded tube, which are connected by threads. This structure is more compact, saves oil pipes and connectors, and can reduce costs.

[0065] This application replaces the traditional piston structure with a plunger structure for the grease injector 17. Utilizing the longer axial length of the plunger 172, a better seal can be achieved. The longer the plunger 172, the greater the distance the thin oil can leak when subjected to fluid pressure from both sides, especially hydraulic oil pressure. This increases the resistance to overcome. In other words, for narrow gaps, increasing the length of the gap achieves a better seal. Traditional pistons are generally disc-shaped, using a rubber sealing ring 174 on the outer circumference of the disc for sealing. This not only has a short sealing distance but also relies on an elastic sealing ring 174, which is easily damaged under high pressure. Therefore, the traditional piston structure easily leads to seal failure, allowing hydraulic oil to enter the grease, contaminating it and preventing normal lubrication. The plunger 172 in this application is longer... The hard metal material and the fit between the outer circumference of the metal plunger 172 and the inner metal wall of the valve cavity achieve a seal, which can withstand high pressure for a long time without damage. On the other hand, this application utilizes the relative positional relationship between the plunger 172 and the grease inlet 1712. By positioning the grease inlet 1712 at the beginning of the plunger 172's grease compression movement, the plunger 172 can block and seal the grease inlet 1712 after moving a short distance, thereby isolating the valve cavity from the grease tank 19. This allows the grease to be discharged only from the grease outlet, eliminating the need for a one-way valve 13 between the grease tank 19 and the grease inlet 1712. This saves on components such as the one-way valve 13 and two connectors. Furthermore, by eliminating the one-way valve 13, the grease inlet 1712 of the grease injector 17 can be directly connected to the outlet of the grease tank 19 without pipes, saving on oil pipes and connectors. The overall layout is more compact, saving volume and reducing costs, achieving multiple benefits.

[0066] Embodiment 2 of the hydraulic lubrication integrated system of this utility model differs from Embodiment 1 in that, as follows: Figure 4 As shown, the distributor connected to the grease outlet 1713 of the grease injector 17 is a progressive distributor 182. Since the progressive distributor 182 does not require pressure relief, the overflow valve 7 and the oil pressure switch are no longer provided.

[0067] Specific embodiments of the wind turbine generator set of this utility model: The wind turbine generator set includes the 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.

[0068] 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. A hydraulic lubrication integrated system, including: Hydraulic oil tank, used to store hydraulic oil; Grease tank, used to store lubricating grease; Hydraulic pump and motor, used to draw hydraulic oil from hydraulic oil tank; 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 actuator. When switching the valve position, the hydraulic actuator is connected to the hydraulic pump or the hydraulic oil tank. The grease injector includes a valve body, a valve cavity inside the valve body, a return spring inside the valve cavity, and the valve cavity has a hydraulic oil inlet, a grease inlet, and a grease outlet. The second electrically controlled switching valve includes three oil ports, which are respectively connected to the hydraulic pump, the hydraulic oil tank and the hydraulic oil inlet. Its characteristic is that it further includes: A plunger with a sliding seal is assembled in the valve cavity. The plunger includes a large-diameter section and a small-diameter section. The valve cavity includes a large-diameter cavity and a small-diameter cavity corresponding to the large-diameter section and the small-diameter section. The return spring is sleeved on the small-diameter section. One end of the return spring abuts against the large-diameter section and the other end abuts against the valve body to provide elastic return force to the plunger. The hydraulic oil inlet is located at the outer end of the large-diameter cavity, the grease inlet is located at the end of the small-diameter cavity near the return spring, and the grease outlet is located at the end of the small-diameter cavity away from the return spring. When the hydraulic oil pushes the plunger to move, it squeezes the grease in the small-diameter cavity toward the grease outlet and grease inlet. When the grease inlet is blocked at the front end of the small-diameter section, the grease flows out only from the grease outlet.

2. The hydraulic lubrication integrated system according to claim 1, characterized in that, The grease outlet is connected to a one-way valve that allows one-way outward flow.

3. The hydraulic lubrication integrated system according to claim 2, characterized in that, The one-way valve and the grease injector share the same valve body.

4. The hydraulic lubrication integrated system according to claim 1, characterized in that, The grease outlet is connected to a distributor via the main oil pipe, and the distributor is connected to the parts of the equipment to be lubricated via branch pipes.

5. The hydraulic lubrication integrated system according to claim 4, characterized in that, The distributor is a single-line distributor, with an overflow valve between the main oil pipe and the grease tank, and a pressure switch on the main oil pipe.

6. The hydraulic lubrication integrated system according to claim 5, characterized in that, A one-way valve that directs towards the oil tank is provided between the second electrically controlled switching valve and the hydraulic oil tank.

7. The hydraulic lubrication integrated system according to claim 1, characterized in that, The position where the plunger is furthest from the grease outlet is defined as the grease inlet limit position. When the plunger is at the grease inlet limit position, the minimum distance between the axis of the grease inlet and the plunger is not less than 1 mm.

8. The hydraulic lubrication integrated system according to claim 1, characterized in that, The narrow section is provided with a sealing groove, and a sealing ring is installed in the sealing groove.

9. The hydraulic lubrication integrated system according to claim 1, characterized in that, The grease injector is installed at the bottom of the grease tank. One of the outlets of the grease tank and the inlet of the grease injector is a threaded hole, and the other is a threaded tube. The two are connected by threads.

10. The hydraulic lubrication integrated system according to claim 1, characterized in that, The first and second electrically controlled switching valves are three-way solenoid valves.

11. A wind turbine generator set, characterized in that, Includes the hydraulic lubrication integrated system as described in any one of claims 1-10.

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