Full-working-condition wind power gear box lubricating system
Technical Field
The invention relates to a lubrication system, in particular to a lubrication system for a full-working-condition wind power gear box, and belongs to the technical field of wind power generation.
Background
The wind power gear box is one of core components in a large wind generating set, and the normal operation of a lubrication and cooling system plays a key role in the working condition and the service life of the whole generating set. At present, the lubrication of the megawatt wind power gear box mostly adopts a mode of combining forced lubrication and splash lubrication. In order to solve the problems that solid particles generated in the working process pollute the cleanliness of lubricating oil and influence the safe operation of gears, one scheme is to install a lubricating system without a bypass fine filtering device, and the lubricating system has the defects of long-term operation, need to replace lubricating oil and keep the cleanliness, so that the cost is increased. Another scheme is to add a set of independent bypass filtration system, including the lubrication cooling that is used for the gear box alone respectively be used for the smart filter of gear box lubricating oil, but this scheme need reserve two sets of interfaces on the gear box to need to guarantee sufficient installation space, the installation pipeline is more, and the oil leak risk increases, and two sets of devices installation is complicated, has the problem that cost and energy consumption are high.
The search can know that the chinese patent document with publication number CN107806508A discloses an off-line filtering system for a high-precision wind power gear box, which is an oil off-line filtering device for a wind power generator set, and needs to be configured with a motor pump set separately, increase circuit supply, add extra external pipelines to filter gear box lubricating oil, increase oil leakage risk and cost, and after the pump set fails, the fine filtering of the lubricating oil of the wind power generator set under the environment condition of full working condition temperature cannot be satisfied.
In addition, chinese patent document with publication number CN208074144U discloses a wind power gear box lubrication system, which uses an electric pump set to provide lubricating oil for a wind power gear box to lubricate and dissipate heat for the wind power gear box. The technical scheme is that the conventional structure is incapable of finely filtering the lubricating oil of the gear box, the cleanliness of the lubricating oil cannot meet the requirements in the long-term operation process of the gear box, the operation risk of the gear box is increased, and the lubricating oil can only be replaced in advance for keeping the oil clean, so that the cost is increased.
The Chinese patent document with publication number of CN205716380U discloses an oil off-line filtering device for a wind generating set, which is essentially an oil off-line filtering device for the wind generating set, and realizes synchronous filtering of oiling and off-line filtering without stopping. Because the offline filtration needs to be independently provided with a motor pump set, the circuit supply and the additional external pipelines are added to filter the lubricating oil of the gear box, the risk of oil leakage and the cost are increased, and after the fault occurs, the fine filtration of the lubricating oil cannot be performed.
The Chinese patent document with publication number of CN104864081B discloses a wind power gear box lubrication system integrating high-speed shaft emergency protection and bypass filtration, wherein the first pump group supplies oil for a gear box, the second pump group is preferably a mechanical pump, and the filtered oil enters a high-speed stage of the gear box for high-speed lubrication. However, according to the technical scheme, a group of filters are additionally added for high-speed lubrication, bypass filtration in a non-true sense is not realized, and the lubrication and fine filtration effects for the wind power gear box can not be realized under all working conditions.
Disclosure of Invention
The invention aims at: aiming at the defects and problems in the prior art, the full-working-condition wind power gear box lubrication system capable of simultaneously realizing lubrication and cooling and oil fine filtration and having good adaptability is provided, so that oil pollution in the running process of the wind power gear box is effectively avoided, and the cleanliness is kept to always meet the requirements.
In order to achieve the purpose, the basic technical scheme of the full-working-condition wind power gear box lubrication system is as follows: the oil inlet of the oil delivery pump set is connected with the bottom of the wind power gear box, and the oil outlet of the oil delivery pump set is connected with a lubricating system filter; the filter of the lubricating system consists of a combined filter core formed by a coarse filter and a fine filter which are connected in parallel, and the coarse filter is connected in series with an overpressure opening one-way valve; one path of the outlet end of the lubricating system filter passes through a pump filtering device valve block and a bypass fine filtering filter which are connected in parallel, and then is led to a lubricating oil path and a nozzle in the gear box through a gear box distributor valve block; the other path is led to a lubricating oil path and a nozzle in the gear box through a gear box distributor valve block after passing through the air cooler; the pump filter device valve block is composed of a temperature control valve.
According to the invention, the bypass filter connected in parallel with the temperature control valve is additionally arranged after the lubrication system filter, so that the air cooling and bypass fine filtration are organically combined together, part of oil flowing out of the lubrication system filter during operation is respectively led into the distributor valve block through the air cooler and the bypass fine filtration filter and is conveyed to the lubrication oil way and the nozzle in the gear box, so that the required lubrication cooling and oil fine filtration are realized at the same time, the oil pollution in the operation process of the wind power gear box can be effectively avoided, the cleanliness is always met, and in the process, the temperature control valve in the wind power gear box can adaptively shunt according to the temperature in the wind power gear box, and the oil quantity of lubrication cooling and oil fine filtration is regulated, so that the lubrication of the whole wind power gear box is in an ideal state. In addition, when the viscosity of the oil is high or the pressure difference between the inside and the outside exceeds a corresponding threshold value due to instant impact, the combined filter element of the filter of the lubricating system can be opened by opening the one-way valve through overpressure, so that the oil is output after coarse filtration.
The invention is further perfected as follows: the oil delivery pump set consists of a mechanical pump and an electric pump which are connected in parallel, and oil outlets of the mechanical pump and the electric pump are connected with an overflow pipe after a one-way valve is opened by overpressure. Thus, the highest working pressure of the system can be limited, and the safety of the system is ensured.
The invention is still further perfected as follows: and oil outlets of the mechanical pump and the electric pump are connected with a lubrication system filter through a lubrication system pressure sensor. Therefore, the oil supply power can be configured as required, and the adaptability is better.
The invention is further perfected as follows: and the inlet end and the outlet end of the lubrication system filter are connected with a lubrication system differential pressure transmitter in parallel. When solid particles intercepted on the filter element reach a certain degree and need to be replaced, the lubrication system differential pressure signaling device sends out an alarm to prompt the replacement of the filter element.
The invention is further perfected as follows: and two ends of the bypass fine filter are connected with the bypass fine filter differential signaling device in parallel. The bypass fine filtration pressure difference transmitter is used for monitoring the state of a filter element of the bypass fine filtration filter, and when the pressure difference between the inside and the outside of the filter element reaches a preset threshold value, the bypass fine filtration pressure difference transmitter transmits an alarm to prompt the replacement of the filter element.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system according to one embodiment of the present invention.
Fig. 2 is a schematic mechanical diagram of the embodiment of fig. 1.
Fig. 3 is a left side view of fig. 2.
In the figure: wind power gear box 1, mechanical pump 2, electric pump 3, oil pump motor 4, mechanical pumping oil pipe 5, electric pumping oil pipe 6, mechanical pumping oil return pipe 7, electric pumping oil return pipe 8, mechanical pumping oil supply check valve 9, electric pumping oil supply check valve 10, overpressure opening check valve 11, overflow pipe 12, lubrication system pressure sensor 13, lubrication system filter 14, lubrication system differential pressure transmitter 15, pump filter device valve block 16, temperature control valve 17, bypass fine filter oil suction pipe 18, bypass fine filter oil suction pipe ball valve 19, bypass fine filter 20, bypass fine filter differential pressure transmitter 21, fine filter check valve 22, bypass fine filter oil return pipe ball valve 23, bypass fine filter oil return pipe 24, gear box oil inlet pipe 25, air cooler 26, gear box oil inlet pipe 27, gear box distributor valve block 28, distributor pressure sensor 29, gear box internal lubrication oil path and nozzle 30, lubrication system bracket 31.
Detailed Description
Example 1
The hydraulic pipeline system of the full-working-condition integrated bypass fine-filtration wind power gear box lubricating system is shown in fig. 1, an oil inlet of an oil delivery pump set is connected with the bottom of a wind power gear box 1, and the oil delivery pump set consists of a parallel mechanical pump 2 and an electric pump 3. The oil outlets of the mechanical pump 2 and the electric pump 3 are connected with a lubrication system filter 14 through a lubrication system pressure sensor 13. And the oil outlets of the mechanical pump 2 and the electric pump 3 are connected with an overflow pipe 12 to return to the bottom of the wind power gear box 1 after the one-way valve 11 is opened by overpressure. The lubrication system filter 14 is composed of a combined filter core composed of a strainer and a fine filter connected in parallel, and the strainer is connected in series with an overpressure opening one-way valve. One path of the outlet end of the lubrication system filter 14 is connected to a pump filter device valve block 16 and a bypass fine filter 20 which are connected in parallel, the pump filter device valve block 16 is actually composed of a temperature control valve 17 (german ACS company, X1.437.45.100 type), and then is connected to a lubrication oil path and a nozzle 30 in the gearbox through a gearbox distributor valve block 28; the other path passes through the air cooler 26 and then through the gearbox distributor valve block 28 to the gearbox internal lubrication circuit and nozzle 30. The gearbox distributor valve block 28 is fitted with a distributor pressure sensor 29.
In addition, the inlet and outlet ends of the lubrication system filter 14 are connected in parallel with a lubrication system differential pressure transmitter 15. The two ends of the bypass fine filter 20 are connected in parallel with a bypass fine filter differential signaling device 21.
The hydraulic system of this embodiment provides a wind-powered electricity generation gear box lubricating system of integrated bypass fine filtration that is suitable for full operating mode, through the integration with bypass fine filtration and online forced air cooling lubrication, and connect bypass fine filtration filter in parallel in the temperature control valve, make partial fluid flow through bypass filter and import the temperature control valve export after flowing out from the lubricating system filter, thereby effectively solved wind-powered electricity generation gear box and had the problem that the clean degree of fluid pollution does not satisfy the requirement in the operation in-process, realized wind-powered electricity generation gear box lubrication cooling and the effect of fluid fine filtration simultaneously.
The mechanical structure of the full-working-condition integrated bypass fine filtration wind power gear box lubrication system of the embodiment is as shown in fig. 2 and 3, and the oil pump motor 4, the lubrication system filter 14, the bypass fine filtration filter 20 and the like are assembled and installed on one side of the wind power gear box 1 through the lubrication system bracket 31, so that the space utilization rate is improved.
The mechanical pump 2 is arranged below the lubrication system filter 14, the lubricating oil is sucked in from an oil suction port of the gear box 1 through the mechanical pump suction pipe 5, flows out from the mechanical pump return pipe 7, and is converged into the lubrication system filter 14 through the mechanical pump oil supply one-way valve 9, and the one-way valve 9 has the function of preventing the lubricating oil of other oil paths from flowing back.
The electric pump 3 is arranged below the oil pump motor 4 and transmits torque and speed via a coupling. The electric pump 3 sucks the lubricating oil from the oil suction port of the gear box 1 through the electric pump suction pipe 6, flows out from the electric pump return pipe 8, and is converged into the lubricating system filter 14 through the electric pump oil supply check valve 10, and the check valve 10 also plays a role in preventing the lubricating oil of other oil paths from flowing back.
To ensure the safety of the system operation, when the pressure exceeds 12bar, the overpressure opening one-way valve 11 will open, overflow and return to the gearbox through the overflow pipe 12 to limit the highest working pressure of the system, protecting the system safety.
The lubrication system filter 14 is internally provided with a 10 mu m and 50 mu m combined filter element, when the viscosity of the oil is high or the pressure difference between the inside and the outside of the combined filter element exceeds 4 bar due to the instant impact of the oil, a one-way valve at the upper end of the combined filter element is opened, and the oil enters a pump filter device valve block 16 after coarse filtration. When the solid particles intercepted on the filter element reach a certain degree and need to be replaced, namely when the internal and external pressure difference of the filter element reaches 3bar, the lubrication system pressure difference signaling device 15 can send out an alarm to prompt the replacement of the filter element.
The interior of the pump filter device valve block 16 is provided with a temperature control valve 17, after filtered oil flows to the temperature control valve, the temperature control valve controls the proportion of two paths of oil flows according to temperature change, one path of oil enters the air cooler 26 for cooling, then enters the gearbox distributor valve block 28, and the other path of oil directly enters the gearbox distributor valve block 28.
A lubrication system pressure sensor 13 is installed before the lubrication system filter 14 for detecting the pre-filter system pressure. A set of bypass fine filter 20 is connected in parallel between the temperature control valve block 17 and the lubricating system filter 14, part of oil flows out of the lubricating system filter 14 and then flows through the bypass fine filter 20 and then directly returns to the gear box to realize fine filtration of lubricating oil, so that the lubricating oil is subjected to fine filtration after being filtered before entering the bypass fine filter 20, and the use of fine filtration consumables is reduced.
The bypass fine filtration oil suction pipe 18 and the bypass fine filtration oil return pipe 24 are respectively connected to two ends of the bypass fine filtration filter 20, a fine filtration filter element with the diameter of 3 mu m is arranged in the bypass fine filtration filter 20, and the bypass fine filtration filter 20 is provided with a bypass fine filtration differential pressure transmitter 21 for detecting the state of the filter element. When the solid particles intercepted on the filter element reach a certain degree and need to be replaced, namely when the internal and external pressure difference of the filter element reaches 2.8bar, the bypass fine filtration pressure difference signaling device 21 can send out an alarm to prompt the replacement of the filter element. The bypass fine filtration oil inlet pipe 18 and the bypass fine filtration oil return pipe 24 are respectively provided with the bypass fine filtration oil inlet pipe ball valve 19 and the bypass fine filtration oil return pipe ball valve 23, so that the outflow of oil in the bypass fine filtration filter 20 can be effectively controlled, and the later maintenance is convenient.
In order to timely respond to the pressure value at the outlet of the oil pump, a distributor pressure sensor 29 is arranged on a distributor valve block 28 of the gearbox, and the system can be monitored through the real-time pressure value transmitted by the distributor pressure sensor. The gears and bearings inside the gearbox are then cooled and lubricated via the gearbox internal lubrication circuit and nozzle 30.
The mechanical pump 2 and the electric pump 3 are independent of each other, and can start lubricating oil filtration and bypass filtration. When the electric pump set stops working, as long as the fan is in a starting state, the mechanical pump can lubricate each heat dissipation point of the wind power gear box and bypass and filter oil, so that the gear box bearing and the gear are effectively protected to be meshed, heat dissipation and lubrication.
Experiments show that the wind power gear box lubrication system adopting the embodiment can meet the requirements of normal lubrication and fine filtration of lubricating oil of a wind generating set under the environment condition of full working condition temperature, namely when a wind field is newly built and is not electrified, or when the wind field does not operate for a long time, when the gear box rotates in a non-power generation state, a mechanical pump can lubricate and fine filter the gear box, most of bearings and meshing points can be lubricated, abrasion and corrosion of gears are prevented, the service performance and service life of the gear box are influenced, the reliability of the whole lubrication is improved, the power generation rate is improved, and the running stability of the wind generating set is improved. The advantages are summarized as follows:
1) The problem that the cleanliness of oil pollution existing in the operation process of the wind power gear box does not meet the requirement is solved, meanwhile, the effects of lubrication, cooling and oil fine filtration of the wind power gear box are achieved, the reliability of lubrication is improved, and the operation stability of the wind power generator set is improved.
2) The integrated structure saves a bypass fine-filtering motor, an oil pump and the like, can lighten the weight, and reduces the production and maintenance cost and the maintenance difficulty.
3) The power supply of the wind power gear box is reduced, the risk of a power supply line is reduced, and the energy conservation and emission reduction are facilitated, and the energy consumption is reduced.
4) External pipeline connection and related interfaces of the gearbox are reduced, so that the risk of lubricating oil leakage is reduced, and the reliability is improved.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.