An external circulation lubrication system for a rotating mechanical bearing

Abstract

This utility model discloses an external circulation lubrication system for rotating machinery bearings, including an oil tank level gauge, a reversible conveying pump, an electric relief valve, an electric suction valve, a pump suction cooling oil circuit, and a control unit. One end of the return oil pipe is connected to the return oil tank, and the other end is connected to the oil tank. The oil tank level gauge is mounted on the oil tank. The reversible conveying pump and the electric relief valve are both connected to the return oil pipe. One end of the suction pipe is connected to the return oil pipe and located between the reversible conveying pump and the electric relief valve, and the other end is connected to the oil tank. The outlet of the inlet oil pipe is connected to the oil tank. The electric suction valve is connected to the suction pipe and is adjacent to the return oil pipe. The control unit is connected to the oil tank level gauge, the reversible conveying pump, the electric relief valve, the electric suction valve, the pump suction cooling oil circuit, and the pump suction top shaft oil circuit, respectively. It controls the operation of the reversible conveying pump, the electric suction valve, and the electric relief valve based on the oil level signal from the oil tank level gauge, effectively solving the problems of abnormal oil tank drainage and difficulty in adjusting the oil level.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical equipment lubrication systems, specifically relating to an external circulation lubrication system for rotating machinery bearings. Background Technology

[0002] In large rotating machinery (such as steam turbines, generators, and wind turbines), bearings are the core components supporting the rotor, and their stable operation highly depends on the lubrication and cooling functions provided by the lubrication system. Regarding lubrication, the lubricating oil forms a dynamic oil film between the bearing and the rotor journal, reducing metal-to-metal friction and wear. During equipment start-up and shutdown, the jacking oil circuit provides high-pressure oil, slightly lifting the rotor journal to prevent dry friction between the journal and the bearing, thus ensuring the rotor's stable and normal rotation relative to the bearing. Regarding cooling, during high-speed rotor rotation, the frictional heat generated between the bearing and the rotor journal is carried away by the circulating lubricating oil, preventing the bearing temperature from becoming too high and causing the alloy layer to melt. Practically, the oil temperature needs to be controlled between 40-60℃ to ensure the lubricating oil viscosity is suitable and can form an effective oil film.

[0003] like Figure 2 The conventional external circulation lubricating oil system shown also has lubrication and cooling functions, and includes an oil return tank 1, an oil sump 2, a pump suction top shaft oil circuit and a pump suction cooling oil circuit.

[0004] First, a return oil pipe 3 connects the return oil tank and the overflow port of the oil sump. Simultaneously, bearing bushes are installed inside the oil sump, and the bearing bushes and the lower half of the rotor are immersed in the lubricating oil within the oil sump. Due to gravity, excess lubricating oil in the oil sump flows back to the return oil tank through the return oil pipe. The return oil tank is equipped with a return oil level gauge 27 and an air filter 26, and the oil sump is equipped with an oil sump level gauge 4.

[0005] Secondly, the jacking oil circuit includes two parallel, redundant jacking oil pumps 31. The inlet of each jacking oil pump 31 is connected to the return oil tank via a jacking oil pipe 40, and the outlet of each pump is connected in series with a first check valve 32 and a downstream manual valve 33, thus forming two jacking oil flow paths. These two jacking oil paths flow out through the outlet of the downstream manual valve 33 and converge at the dual filter 29. After being filtered by the dual filter 29, the oil is split into multiple jacking oil branches by the second check valve 34. Figure 2 Twelve jacking oil branches are shown. Since the bearing bushes are composed of multiple bearing bush blocks 38 arranged in a ring around the rotor journal, and each bearing bush block 38 has a jacking oil chamber 37, each jacking oil branch is connected one-to-one to each jacking oil chamber 37. Furthermore, to ensure stable operation of the jacking oil circuit, each jacking oil branch is equipped with a branch speed regulating valve 35 for adjusting the jacking oil flow rate and a branch check valve 36 to prevent backflow of the jacking oil, with the branch speed regulating valve 35 located upstream of the branch check valve 36.

[0006] Third, the pump-suction cooling oil route consists of a lubricating oil pump, filter, cooler, valve, and detection element. Specifically, three parallel and redundant lubricating oil pumps 10 are set up. The inlet of each lubricating oil pump 10 is connected to the oil tank through an oil suction pipe 8, and the outlet is connected in series with a lubricating oil check valve 11 and a lubricating oil manual valve 12, thus forming three flow paths for lubricating oil to be cooled. These three paths of lubricating oil to be cooled converge to the lubricating oil dual filter 40, and after being filtered by the lubricating oil dual filter, they enter two backup coolers 14. After being cooled by the coolers 14, they flow into the oil tank through the oil inlet pipe 9.

[0007] Regarding the cooler, the cooler 14 has an electric inlet valve 19 connected to its inlet for adjusting the cooling water volume, a manual drain valve 20 connected to its outlet, an upstream manual oil regulating valve 21 connected to its oil inlet, and a downstream manual oil regulating valve 22 connected to its oil outlet. The inlet of the upstream manual oil regulating valve 21 is connected to the lubricating oil dual filter 40, and the outlet of the downstream manual oil regulating valve 22 is connected to the oil inlet pipe 9. Simultaneously, the inlet of the electric inlet valve 19 is connected to cooling water via the inlet pipe 15, and the outlet of the manual drain valve 20 is connected to cooling water via the drain pipe 16.

[0008] Regarding the detection elements, a cooling water flow meter 17 is installed on the water inlet pipe 15, a cooling water temperature transmitter 18 for monitoring the temperature of the discharged cooling water is installed on the drain pipe 16, and a second temperature transmitter 24 and a lubricating oil flow meter 25 are installed on the oil inlet pipe 9 to monitor the temperature and flow rate of the lubricating oil entering the oil tank 2. Furthermore, a temperature transmitter 39 for monitoring the temperature of the lubricating oil delivered to the return oil tank is installed on the oil return pipe 3. All of these detection elements are connected to the control unit.

[0009] As can be seen, the conventional external circulation lubrication system, with its simple and reliable structural design, achieves basic cooling and lubrication functions. However, in practical applications, the reliability of this lubrication system remains insufficient. The reason lies in the fact that excess lubricating oil in the oil tank overflows to the return oil tank by gravity, requiring the return oil pipe to be installed at a height lower than the oil tank. However, in many real-world scenarios, the actual installation height of the return oil pipe often needs to be higher than the oil tank. This leads to problems such as the oil tank not draining properly and difficulty in adjusting the oil level, resulting in an increase in the lubricating oil level and temperature in the oil tank. Ultimately, this causes the lubrication system to malfunction, severely affecting its cooling and lubrication effect on the bearings of rotating machinery. Utility Model Content

[0010] The purpose of this utility model is to solve the above-mentioned problems in the prior art and provide a new type of external circulation lubrication system for rotating machinery bearings. Through the linkage design of the control unit, forward and reverse conveying pump, electric drain valve and electric suction valve, the height of the return oil pipe is no longer limited by the height of the oil tank. This effectively solves the technical problems of the oil tank being unable to drain normally and the oil level being difficult to adjust due to the return oil pipe being higher than the oil tank, and realizes automatic liquid level adjustment.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An external circulation lubrication system for rotating machinery bearings includes an oil return tank, an oil sump, an oil return pipe, an oil sump level gauge, a forward and reverse reversing conveyor pump, an electric relief valve, an electric suction valve, a suction pipe, an inlet pipe, a pump suction cooling oil circuit, a pump suction top shaft oil circuit, and a control unit. One end of the oil return pipe is connected to the oil return tank, and the other end is connected to the oil sump. The oil sump level gauge is mounted on the oil sump. The forward and reverse reversing conveyor pump and the electric relief valve are both connected to the oil return pipe. One end of the suction pipe is connected to the oil return pipe and located between the forward and reverse reversing conveyor pump and the electric relief valve; the other end is connected to the oil sump. The pump suction cooling... The oil circuit is connected between the suction pipe and the inlet of the inlet pipe, and the outlet of the inlet pipe is connected to the oil tank; one end of the pump suction top shaft oil circuit is connected to the suction pipe, and the other end is connected to the top shaft oil chamber; the electric suction valve is connected to the suction pipe and adjacent to the return pipe, and is used to control the supply of oil from the return oil tank to the oil tank; the control unit is connected to the oil tank level gauge, the forward and reverse conveying pump, the electric drain valve, the electric suction valve, the pump suction cooling oil circuit, and the pump suction top shaft oil circuit, and controls the operation of the forward and reverse conveying pump, the electric drain valve, and the electric suction valve according to the oil level signal of the oil tank level gauge.

[0012] The return oil pipe, suction oil pipe, and inlet oil pipe all extend into the oil tank from above.

[0013] Before the lubrication system is running, the control unit controls the electric suction valve to open, the electric drain valve, the pump suction cooling oil circuit and the pump suction top shaft oil circuit to close, and controls the forward and reverse conveying pumps to rotate forward until the oil level gauge detects that the oil level in the oil tank has reached the preset range, at which point the control unit controls the electric suction valve and the forward and reverse conveying pumps to close.

[0014] When the lubrication system is running, the control unit controls the opening of the pump suction cooling oil circuit and the pump suction top shaft oil circuit, keeps the electric suction valve closed, and receives the oil level signal from the oil tank level gauge in real time. If the oil level in the oil tank is within the preset range, the control unit keeps the electric relief valve and the forward and reverse conveying pump closed; if the oil level in the oil tank exceeds the upper limit of the preset range, the control unit controls the electric relief valve to open and the forward and reverse conveying pump to reverse.

[0015] A first temperature transmitter connected to the control unit is connected to the oil suction pipe. The first temperature transmitter is located between the oil tank and the pump suction cooling oil circuit, and works with the control unit to monitor the temperature of the lubricating oil entering the pump suction cooling oil circuit from the oil suction pipe.

[0016] The pump suction cooling oil circuit is configured with at least two redundant circuits, which are connected in parallel between the suction pipe and the inlet pipe. Each pump suction cooling oil circuit includes a lubricating oil pump, a lubricating oil check valve, a lubricating oil manual valve, a lubricating oil filter, an upstream manual oil adjusting valve, a cooler, and a downstream manual oil adjusting valve connected in series. The outlet of the downstream manual oil adjusting valve is connected to the inlet of the inlet pipe, and the inlet of the lubricating oil pump is connected to the suction pipe. The control unit is connected to the lubricating oil pump to control the start and stop of the lubricating oil pump.

[0017] The cooler has an oil inlet, an oil outlet, a water inlet, and a water outlet. The oil inlet and the oil outlet are connected to an upstream manual oil regulating valve and a downstream manual oil regulating valve, respectively. The water inlet is used to connect to an electric water inlet valve, and the water outlet is used to connect to a manual drain valve.

[0018] The pump suction jack shaft oil circuit includes a jack shaft oil filter, a dual filter, and at least two sets of redundant jack shaft oil supply assemblies, wherein the jack shaft oil supply assemblies are connected in parallel between the jack shaft oil filter and the dual filter.

[0019] The jacking oil supply assembly includes a jacking oil upstream manual valve, a jacking oil pump, a first check valve, and a jacking oil downstream manual valve connected in series. The control unit is connected to the jacking oil pump and is used to control the start and stop of the jacking oil pump.

[0020] The advantages of using this utility model are: 1. This utility model discloses an external circulation lubrication system for rotating machinery bearings. Firstly, the linkage design of the control unit, forward and reverse reversing pump, electric drain valve, and electric suction valve makes the design of the return oil pipe height no longer limited by the oil tank height. This ensures that the external circulation lubrication system can operate stably and reliably under various actual working conditions. It effectively solves the technical problems of the oil tank being unable to drain normally and the oil tank level being difficult to adjust due to the return oil pipe being higher than the oil tank. It realizes oil circulation and automatic liquid level adjustment, improves the reliability of the lubrication system, and ensures the safe and efficient operation of rotating machinery.

[0021] Secondly, in conventional external circulation lubrication systems, excess lubricating oil in the oil tank relies on gravity to overflow into the return oil tank. In practical scenarios, the return oil pipe is often installed higher than the oil tank, preventing normal drainage. This invention, however, overcomes the limitations of conventional external circulation lubrication systems by establishing a physical connection structure for the return oil tank, oil tank, return oil pipe, oil tank level gauge, forward and reverse conveying pump, electric relief valve, electric suction valve, suction pipe, inlet pipe, pump suction cooling oil circuit, and pump suction top shaft oil circuit. Furthermore, the coordinated design of the control unit, forward and reverse conveying pump, electric relief valve, and electric suction valve eliminates the reliance on gravity overflow for excess lubricating oil return, avoiding the problem of insufficient drainage leading to rising oil levels and increased temperature in the oil tank. This maintains stable oil tank levels and significantly improves the cooling and lubrication effect on rotating machinery bearings.

[0022] Third, an oil suction pipe is connected at one end to the return oil pipe and located between the reversible pump and the electric relief valve, while the other end is connected to the oil tank. An electric suction valve is connected to the suction pipe and adjacent to the return oil pipe. Before the lubrication system starts operating, the electric suction valve is opened, connecting the return oil tank and the oil tank, thus replenishing lubricating oil to the oil tank until the oil level in the tank is maintained within a preset range. Simultaneously, air in the suction pipe is vented, preventing cavitation in the pump's cooling oil circuit during operation, ensuring the normal operation of the pump's cooling oil circuit, and significantly improving the reliability of the lubrication system.

[0023] 2. In this utility model, the design of the return oil pipe, suction oil pipe and inlet oil pipe all extending into the oil tank from above makes the lubrication system not subject to strict space height restrictions during installation, and can adapt to more complex installation environments and site conditions, thus improving the versatility of the lubrication system.

[0024] 3. In this invention, before the lubrication system starts operating, the control unit precisely controls the opening of the electric oil suction valve, while simultaneously closing the electric relief valve, the pump suction cooling oil circuit, and the pump suction jack shaft oil circuit. It then drives the forward and reverse-rotation delivery pump to rotate forward until the oil level in the oil tank reaches the preset range before shutting down the relevant equipment. This series of operations improves the accuracy and efficiency of oil level adjustment before the lubrication system starts, ensuring the system can quickly enter the operating phase in optimal condition, reducing start-up delays and potential failure risks caused by oil level issues.

[0025] 4. In this invention, the control unit receives the oil level signal from the oil level gauge in real time during lubrication system operation and precisely controls the operation of the electric relief valve and the forward and reverse conveying pumps according to the preset range of oil level (keeping closed when the oil level is normal, and opening the relief valve and reversing the forward and reverse conveying pumps when the oil level exceeds the upper limit), thus improving the stability of oil level control during the operation of the external circulation lubrication system. Simultaneously, it achieves intelligent and automated operation of the lubrication system, eliminating the need for manual intervention, reducing labor intensity, avoiding the risk of oil temperature runaway, and improving the accuracy and stability of the lubrication system operation.

[0026] 5. In this utility model, by setting a first temperature transmitter on the oil suction pipe, located between the oil tank and the pump suction cooling oil circuit and connected to the control unit, the comprehensive monitoring capability of the operating parameters of the external circulation lubrication system of rotating machinery bearings is improved, and the temperature of the lubricating oil in the oil suction and oil inlet stages is accurately controlled, providing richer data support for the stable operation of the lubrication system.

[0027] 6. In this utility model, the design of at least two redundant pump suction cooling oil circuits improves the fault tolerance of the lubrication system, significantly reduces downtime due to malfunctions, and substantially enhances the flexibility and reliability of the lubrication system. Furthermore, the pump suction cooling oil circuit, consisting of a lubricating oil pump, a lubricating oil check valve, a lubricating oil manual valve, a lubricating oil filter, an upstream manual oil adjusting valve, a cooler, and a downstream manual oil adjusting valve connected in series, ensures that the lubricating oil is adequately cooled before entering the oil tank.

[0028] More importantly, because the pump suction cooling oil circuit has at least two redundant designs, when facing large oil volume conditions, the lubricating oil filter and cooler can be selected according to the flow rate of the corresponding lubricating oil pump in series, which greatly reduces energy consumption and equipment costs. Based on the redundant design, the coordinated control of the connection structure of valves such as the lubricating oil manual valve, upstream manual oil adjusting valve, downstream manual oil adjusting valve, electric water inlet valve, and manual drain valve improves the switching efficiency of the lubrication system in the event of a single circuit failure in the pump suction cooling oil circuit.

[0029] 7. In this utility model, the pump suction jacking oil circuit is formed by the jacking oil filter, the double filter, and at least two sets of redundant jacking oil supply components, which improves the redundancy. The failure of a single set does not affect the overall oil supply, ensuring a continuous and stable supply of high-pressure oil and preventing dry friction between the journal and the bearing. Furthermore, the design of the jacking oil filter and the double filter can effectively remove impurities from the jacking oil, ensuring oil cleanliness, reducing wear, and further improving the reliability of the lubrication system.

[0030] 8. In this utility model, the jacking oil supply assembly is formed by the upstream manual valve, the jacking oil pump, the first check valve, and the downstream manual valve of the jacking oil connected in series. Based on the redundant design of the jacking oil supply assembly, the switching efficiency of the lubrication system when a single jacking oil supply assembly fails is improved by the coordinated control of the upstream manual valve and the downstream manual valve of the jacking oil. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external circulation lubrication system of this utility model; Figure 2 This is a schematic diagram of an existing external circulation lubrication system.

[0032] The following are the labels in the diagram: 1. Oil return tank; 2. Oil tank; 3. Oil return pipe; 4. Oil tank level gauge; 5. Forward and reverse reversing conveyor pump; 6. Electric drain valve; 7. Electric suction valve; 8. Suction pipe; 9. Oil inlet pipe; 10. Lubricating oil pump; 11. Lubricating oil check valve; 12. Lubricating oil manual valve; 13. Lubricating oil filter; 14. Cooler; 15. Water inlet pipe; 16. Drain pipe; 17. Cooling water flow meter; 18. Cooling water temperature transmitter; 19. Electric water inlet valve; 20. Manual drain valve; 21. Upstream manual oil regulating valve; 22. Downstream manual... 23. Oil regulating valve; 24. First temperature transmitter; 25. Second temperature transmitter; 26. Lubricating oil flow meter; 27. Air filter; 28. Return oil level gauge; 29. ​​Top shaft oil filter; 30. Dual filter; 31. Top shaft oil upstream manual valve; 32. Top shaft oil pump; 33. First check valve; 34. Top shaft oil downstream manual valve; 35. Second check valve; 36. Branch speed control valve; 37. Branch check valve; 38. Top shaft oil chamber; 39. Bearing block; 40. Temperature transmitter; 41. Top shaft oil pipe; 42. Lubricating oil dual filter. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. For ease of description, the description of the relative positional relationships of each component is based on the layout of the accompanying drawings, such as the positional relationships of front, back, top, bottom, left, and right, which are determined according to the layout direction of the accompanying drawings.

[0034] Example 1 In this embodiment, an external circulation lubrication system for rotating machinery bearings is provided, such as... Figure 1 As shown, the system includes an oil return tank 1, an oil sump 2, an oil return pipe 3, an oil sump level gauge 4, a forward and reverse reversing conveying pump 5, an electric drain valve 6, an electric suction valve 7, a suction pipe 8, an inlet pipe 9, a pump suction cooling oil circuit, a pump suction top shaft oil circuit, and a control unit. The specific connection structure of this lubrication system is as follows: One end of the return oil pipe 3 is connected to the return oil tank 1, and the other end is connected to the oil trough 2.

[0035] Oil level gauge 4 is installed on oil tank 2.

[0036] Both the forward and reverse reversible pump 5 and the electric relief valve 6 are connected to the return oil pipe 3.

[0037] One end of the oil suction pipe 8 is connected to the return oil pipe 3 and is located between the forward and reverse conveying pump 5 and the electric relief valve 6. The other end of the oil suction pipe 8 is connected to the oil tank 2.

[0038] The pump suction cooling oil circuit is connected between the suction pipe 8 and the inlet of the inlet pipe 9. The inlet of the inlet pipe 9 receives the lubricating oil cooled by the pump suction cooling oil circuit, and the outlet of the inlet pipe 9 is connected to the oil tank 2, which delivers the cooled lubricating oil to the oil tank 2, thereby lubricating and cooling the bearing. One end of the pump suction jacking oil circuit is connected to the oil suction pipe 8, and the other end is connected to the jacking oil chamber. Specifically, the jacking oil circuit branches off at the other end with a number of jacking oil branches equal to the number of bearing blocks 38, and each jacking oil branch is connected to the corresponding jacking oil chamber 37.

[0039] An electric suction valve 7 is connected to the suction pipe 8 and adjacent to the return pipe 3, used to control the supply of lubricating oil from the return tank 1 to the oil sump 2. Before the lubrication system operates, the electric suction valve 7 is opened, connecting the return tank 1 to the oil sump 2, thereby supplying lubricating oil to the oil sump 2 until the lubricating oil level in the oil sump 2 is maintained within a preset range. Simultaneously, air in the suction pipe 8 is vented, preventing air suction in the pump cooling oil circuit during lubrication system operation and ensuring the normal operation of the pump cooling oil circuit. Furthermore, the return tank 1 is equipped with an air filter 26 for filtering and venting air, further ensuring that the pump cooling pipeline is free of air bubbles.

[0040] The control unit is connected to the oil level gauge 4, the forward and reverse conveying pump 5, the electric relief valve 6, the electric suction valve 7, the pump suction cooling oil circuit and the pump suction top shaft oil circuit, and controls the operation of the forward and reverse conveying pump 5, the electric relief valve 6 and the electric suction valve 7 according to the oil level signal of the oil level gauge 4.

[0041] Therefore, the control unit, the forward and reverse reversing pump 5, the electric relief valve 6, and the electric suction valve 7 form a linked design, thus freeing the height design of the return oil pipe 3 from the height of the oil tank 2. In actual installation, the return oil pipe 3, suction oil pipe 8, and inlet oil pipe 9 can be designed as a low-position installation below the height of the oil tank 2, as is common in conventional lubrication systems, or they can be arranged to extend into the oil tank 2 from above, depending on actual needs. Regardless of the arrangement, it will not affect the normal drainage and level adjustment of the lubricating oil in the oil tank.

[0042] In addition, the control unit, the forward and reverse transfer pump 5, the electric relief valve 6, and the electric suction valve 7 can be linked by sensors. Since the linkage method between the control unit, the forward and reverse transfer pump 5, the electric relief valve 6, and the electric suction valve 7 is a known technology, it will not be described in detail here.

[0043] Before the lubrication system is running, the control unit controls the electric suction valve 7 to open, the electric drain valve 6, the pump suction cooling oil circuit and the pump suction top shaft oil circuit to close, and controls the forward and reverse conveying pump 5 to rotate forward until the oil level gauge 4 detects that the oil level in the oil tank 2 has reached the preset range, then controls the electric suction valve 7 and the forward and reverse conveying pump 5 to close.

[0044] During lubrication system operation, the control unit controls the opening of the pump suction cooling oil circuit and the pump suction top shaft oil circuit, keeps the electric suction valve 7 closed, and receives the oil level signal from the oil tank level gauge 4 in real time. If the oil level in the oil tank 2 is within the preset range, the control unit keeps the electric relief valve 6 and the forward and reverse conveying pump 5 closed. At this time, the lubricating oil in the oil tank 2 is drawn by the pump suction cooling oil circuit and the pump suction top shaft oil circuit through the suction pipe 8. One path returns to the oil tank 2 through the pump suction cooling oil circuit, and the other path is conveyed to the top shaft oil chamber 37 through the pump suction top shaft oil circuit. If the oil level in the oil tank 2 exceeds the upper limit of the preset range, the control unit controls the opening of the electric relief valve 6 and the reverse rotation of the forward and reverse conveying pump 5. At this time, the lubrication system returns the excess oil in the oil tank 2 to the return oil tank 1 through the return oil pipe 3, ensuring that the oil level in the oil tank 2 is always within the preset range.

[0045] Example 2 Based on Example 1, this example incorporates corresponding detection elements on the oil suction pipe 8 and the oil inlet pipe 9.

[0046] Specifically, such as Figure 1 As shown, a first temperature transmitter 23 connected to the control unit is mounted on the oil suction pipe 8. The first temperature transmitter 23 is located between the oil tank 2 and the pump suction cooling oil circuit, and works with the control unit to monitor the temperature of the lubricating oil entering the pump suction cooling oil circuit from the oil suction pipe 8. In addition, a second temperature transmitter 24 and a lubricating oil flow meter 25, respectively connected to the control unit, are mounted on the oil inlet pipe 9. The second temperature transmitter 24 and the lubricating oil flow meter 25 are used to monitor the temperature and flow rate of the lubricating oil entering the oil tank 2, respectively. The control unit compares the temperature data monitored by the first temperature transmitter 23 and the second temperature transmitter 24. If an abnormality is detected, an alarm signal is issued according to preset logic.

[0047] Example 3 Based on Examples 1 and 2, this example optimizes the connection structure of the pump suction cooling oil circuit.

[0048] Continue to refer to Figure 1The pump suction cooling oil circuit is configured with at least two redundant circuits, which are connected in parallel between the suction pipe 8 and the inlet pipe 9. Each pump suction cooling oil circuit includes a lubricating oil pump 10, a lubricating oil check valve 11, a lubricating oil manual valve 12, a lubricating oil filter 13, an upstream manual oil adjusting valve 21, a cooler 14, and a downstream manual oil adjusting valve 22 connected in series. The outlet of the downstream manual oil adjusting valve 22 is connected to the inlet of the inlet pipe 9, and the inlet of the lubricating oil pump 10 is connected to the suction pipe 8. The control unit is connected to the lubricating oil pump 10 to control the start and stop of the lubricating oil pump 10.

[0049] Furthermore, the cooler 14 has an oil inlet, an oil outlet, a water inlet, and a water outlet. The oil inlet and the oil outlet are respectively connected to the upstream manual oil regulating valve 21 and the downstream manual oil regulating valve 22. The water inlet is used to connect to the electric water inlet valve, and the water outlet is used to connect to the manual drain valve.

[0050] Therefore, in actual working conditions, due to the redundant design of the pump suction cooling oil circuit, as well as the connection structure of the lubricating oil manual valve 12, the upstream manual oil adjusting valve 21, the downstream manual oil adjusting valve 22, the electric water inlet valve 19, and the manual drain valve 20, each lubricating oil pump 10 can be started and stopped as needed.

[0051] Example 4 Based on Example 3, this example optimizes the oil circuit of the pump suction shaft.

[0052] Continue to refer to Figure 1 The pump suction jacking oil circuit includes a jacking oil filter 28, a dual filter 29, and at least two sets of redundant jacking oil supply assemblies, which are connected in parallel between the jacking oil filter 28 and the dual filter 29.

[0053] Furthermore, the jacking oil supply assembly includes a jacking oil upstream manual valve 30, a jacking oil pump 31, a first check valve 32, and a jacking oil downstream manual valve 33 connected in series. The control unit is connected to the jacking oil pump 31 to control the start and stop of the jacking oil pump 31.

[0054] Thus, the oil enters the jacking oil circuit from the suction pipe 8, and first flows through the jacking oil filter 28 for preliminary filtration. The filtered oil is then distributed to any activated jacking oil supply assembly. Within the jacking oil supply assembly, the oil flows sequentially through the upstream manual valve 30, the jacking oil pump 31 for pressurization, the first check valve 32 to prevent backflow, and the downstream manual valve 33. The pressurized oil flowing out of the jacking oil supply assembly then collects and enters the dual filter 29 for fine filtration. Finally, the finely filtered oil flows out of the dual filter 29 and is ultimately delivered to the corresponding jacking oil chambers 37 through jacking oil branches equal in number to the bearing blocks 38.

[0055] In summary, the working principle of this utility model is as follows: 1. Before starting the lubrication system: The control unit closes the pump suction cooling oil circuit, the pump suction top shaft oil circuit and the electric drain valve 6, opens the electric oil suction valve 7 and drives the forward and reverse conveying pump 5 to rotate in the forward direction, pumping the lubricating oil returning to the oil tank 1 into the oil sump 2 through the oil suction pipe 8 until the oil level in the oil sump 2 reaches the preset range and the air in the oil suction pipe 8 is emptied, then closes the electric oil suction valve 7 and the forward and reverse conveying pump 5.

[0056] II. When the lubrication system starts up, the control unit turns on the selected lubricating oil pump 10 and the jacking oil pump 31, while keeping the electric suction valve 7 closed. At this time, the lubricating oil in the oil tank 2 is drawn out through the suction pipe 8: one route is taken by the lubricating oil pump 10, purified and cooled by the lubricating oil filter 13 and cooler 14, and then returned to the oil tank 2 through the oil inlet pipe 9 to continuously lubricate and cool the bearings; the other route is taken by the pump to the jacking oil circuit for filtration, pressurization, and fine filtration, and then supplied to the corresponding jacking oil chamber 37 to establish a lifting oil film after speed adjustment on each jacking oil branch. During operation, the control unit continuously monitors the oil level in the oil tank 2: if the oil level is within the preset range, the electric relief valve 6 is kept closed and the forward and reverse conveying pump 5 is stopped; if the oil level exceeds the upper limit, the electric relief valve 6 is immediately opened and the forward and reverse conveying pump 5 is driven to reverse, drawing the excess oil in the oil tank 2 back to the return oil tank 1 through the return oil pipe 3 until the oil level returns to normal. Throughout the process, the control unit automatically schedules the forward and reverse rotation of the forward and reverse conveying pump 5, valve switching, and the start and stop of each functional oil pump to ensure stable oil level, reliable lubrication and cooling, and precise oil supply to the top shaft, thus achieving efficient external circulation lubrication of the bearing bush.

[0057] The above description is only a specific embodiment of the present utility model. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in all methods or processes disclosed may be combined in any way except for mutually exclusive features and / or steps.

Claims

1. An external circulation lubrication system for rotating machinery bearings, characterized in that: The system includes a return oil tank (1), an oil sump (2), a return oil pipe (3), an oil sump level gauge (4), a forward and reverse conveying pump (5), an electric drain valve (6), an electric suction valve (7), a suction pipe (8), an inlet pipe (9), a pump suction cooling oil circuit, a pump suction top shaft oil circuit, and a control unit. One end of the return oil pipe (3) is connected to the return oil tank (1), and the other end is connected to the oil sump (2). The oil sump level gauge (4) is installed on the oil sump (2). The forward and reverse conveying pump (5)... Both the pump (5) and the electric relief valve (6) are connected to the return oil pipe (3); one end of the suction pipe (8) is connected to the return oil pipe (3) and located between the forward and reverse conveying pump (5) and the electric relief valve (6), and the other end is connected to the oil tank (2); the pump suction cooling oil circuit is connected between the suction pipe (8) and the inlet of the oil inlet pipe (9), and the outlet of the oil inlet pipe (9) is connected to the oil tank (2); one end of the pump suction top shaft oil circuit is connected to the suction pipe (8), and the other end is connected to the top shaft oil chamber; The electric suction valve (7) is connected to the suction pipe (8) and adjacent to the return pipe (3), and is used to control the supply and disconnection of oil from the return tank (1) to the oil tank (2); the control unit is connected to the oil tank level gauge (4), the forward and reverse conveying pump (5), the electric drain valve (6), the electric suction valve (7), the pump suction cooling oil circuit and the pump suction top shaft oil circuit, and controls the forward and reverse conveying pump (5), the electric drain valve (6) and the electric suction valve (7) to operate according to the oil level signal of the oil tank level gauge (4).

2. The external circulation lubrication system for rotating machinery bearings according to claim 1, characterized in that: The return oil pipe (3), suction oil pipe (8) and inlet oil pipe (9) all extend into the oil tank (2) from above.

3. The external circulation lubrication system for rotating machinery bearings according to claim 2, characterized in that: Before the lubrication system is running, the control unit controls the electric suction valve (7) to open, the electric drain valve (6), the pump suction cooling oil circuit and the pump suction top shaft oil circuit to close, and controls the forward and reverse conveying pump (5) to rotate forward until the oil level gauge (4) detects that the oil level in the oil tank (2) has reached the preset range, then controls the electric suction valve (7) and the forward and reverse conveying pump (5) to close.

4. The external circulation lubrication system for rotating machinery bearings according to claim 3, characterized in that: When the lubrication system is running, the control unit controls the opening of the pump suction cooling oil circuit and the pump suction top shaft oil circuit, keeps the electric suction valve (7) closed, and receives the oil level signal from the oil tank level gauge (4) in real time. If the oil level in the oil tank (2) is within the preset range, the control unit keeps the electric drain valve (6) and the forward and reverse conveying pump (5) closed. If the oil level in the oil tank (2) exceeds the upper limit of the preset range, the control unit controls the electric drain valve (6) to open and the forward and reverse conveying pump (5) to reverse.

5. The external circulation lubrication system for rotating machinery bearings according to claim 2, characterized in that: The oil suction pipe (8) is connected to a first temperature transmitter (23) connected to the control unit. The first temperature transmitter (23) is located between the oil tank (2) and the pump suction cooling oil circuit, and works with the control unit to monitor the temperature of the lubricating oil entering the pump suction cooling oil circuit from the oil suction pipe (8).

6. The external circulation lubrication system for rotating machinery bearings according to claim 5, characterized in that: The pump suction cooling oil circuit is configured with at least two redundant circuits. The pump suction cooling oil circuits are connected in parallel between the suction pipe (8) and the inlet pipe (9). Each pump suction cooling oil circuit includes a lubricating oil pump (10), a lubricating oil check valve (11), a lubricating oil manual valve (12), a lubricating oil filter (13), an upstream manual oil adjusting valve (21), a cooler (14), and a downstream manual oil adjusting valve (22) connected in series. The outlet of the downstream manual oil adjusting valve (22) is connected to the inlet of the inlet pipe (9), and the inlet of the lubricating oil pump (10) is connected to the suction pipe (8). The control unit is connected to the lubricating oil pump (10) to control the start and stop of the lubricating oil pump (10).

7. The external circulation lubrication system for rotating machinery bearings according to claim 6, characterized in that: The cooler (14) has an oil inlet, an oil outlet, a water inlet and a water outlet. The oil inlet and the oil outlet are connected to the upstream manual oil regulating valve (21) and the downstream manual oil regulating valve (22) respectively. The water inlet is used to connect to the electric water inlet valve and the water outlet is used to connect to the manual drain valve.

8. The external circulation lubrication system for rotating machinery bearings according to claim 2, characterized in that: The pump suction top shaft oil circuit includes a top shaft oil filter (28), a dual filter (29), and at least two sets of redundant top shaft oil supply components, wherein the top shaft oil supply components are connected in parallel between the top shaft oil filter (28) and the dual filter (29).

9. The external circulation lubrication system for rotating machinery bearings according to claim 8, characterized in that: The jacking oil supply assembly includes a jacking oil upstream manual valve (30), a jacking oil pump (31), a first check valve (32), and a jacking oil downstream manual valve (33) connected in series. The control unit is connected to the jacking oil pump (31) to control the start and stop of the jacking oil pump (31).

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