External gear oil filtering and purifying system
The external gear oil filtration and purification system with three-stage filtration and dual cooling solves the problems of low filtration efficiency and insufficient purification capacity of gear oil filtration systems, achieving efficient purification and cooling, ensuring that the oil temperature is controlled within 45℃, and extending the service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY TUNNEL GROUP CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-05-05
AI Technical Summary
Existing gear oil filtration systems suffer from low filtration efficiency, insufficient purification capacity, inadequate cooling efficiency, high temperature leading to sealant failure, difficulty in waste oil recovery, system pressure imbalance, and a tendency to experience cavitation or pressure buildup, thus affecting equipment lifespan.
The system employs a three-stage series basket filter, a closed filter box, and an external vacuum filter, combined with a cooling oil storage tank and a finned plate cooler. Through multi-stage filtration and cooling, it ensures oil purification and temperature control. The waste oil sedimentation tank is connected to the oil outlet pipeline via a bypass branch, and a three-way diversion valve is installed to switch the flow direction, achieving efficient purification and cooling.
It improves the purification capacity and cooling efficiency of gear oil, ensures that the oil temperature is within 45℃, extends the service life of equipment, avoids direct circulation of contaminated oil, and prevents equipment damage.
Smart Images
Figure CN224201096U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of tunnel boring machine lubrication systems, and in particular to an external gear oil filtration and purification system. Background Technology
[0002] Tunnel boring machines (TBMs) are large-scale hard rock excavation equipment, and their main drive is a critical component. The cooling and purification of the main drive are of paramount importance, directly affecting its service life. The original gear oil filtration system, in order to reduce gear oil temperature, first cooled the gear oil through newly added coils before further cooling it through the original gear oil system. However, the original gear oil filtration system had low filtration efficiency and insufficient purification capacity, low circulation flow, and poor low-temperature adaptability.
[0003] During equipment operation, the gear oil cooling system may malfunction due to prolonged continuous operation, leading to a sustained abnormal temperature rise in critical components such as the main bearing. Based on the current situation, we need to address the following issues: a. Insufficient cooling efficiency: The original cooling system relies on single-stage heat dissipation, making it difficult to reduce oil temperature to the safe threshold (below 45℃), causing high temperatures to lead to sealant failure; b. Insufficient purification capacity: Traditional filtration systems mostly use single physical filtration, only removing solid particles; c. Difficulty in waste oil recovery: Traditional systems lack waste oil diversion design, allowing contaminated oil to circulate directly, exacerbating oil quality deterioration; d. Difficulty in waste oil recovery: Traditional systems lack waste oil diversion design, allowing contaminated oil to circulate directly, exacerbating oil quality deterioration; e. System pressure imbalance: Inconsistent flow rates when multiple pumps operate in parallel can easily lead to cavitation or pressure buildup, causing equipment damage.
[0004] Therefore, in view of the shortcomings of the above-mentioned solutions in actual production and implementation, modifications and improvements have been made. At the same time, in the spirit and concept of seeking excellence, and with the assistance of professional knowledge and experience, this utility model provides a new type of external gear oil filtration and purification system to improve the problems of high temperature and slow filtration of gear oil. Utility Model Content
[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide an external gear oil filtration and purification system with good purification effect and high cooling efficiency.
[0006] This utility model is achieved by the following technical solution: an external gear oil filtration and purification system, including a main drive, a waste oil sedimentation tank, a filtration and purification unit, and a cooling unit. The main drive has two waste oil outlets and two oil inlets. The two waste oil outlets are respectively connected to the filtration and purification unit through an oil outlet pipeline system. The outlet end of the filtration and purification unit is connected to the inlet end of the cooling unit through a pipeline. The outlet end of the cooling unit is respectively connected to the two oil inlets through two oil inlet pipelines. The waste oil sedimentation tank is connected to one of the pipelines in the oil outlet pipeline system through a bypass branch.
[0007] Furthermore, the oil outlet pipeline system includes two oil outlet pipelines, a manifold pipeline, and two oil outlet branch pipelines. The front ends of the two oil outlet pipelines are connected to two waste oil outlets, and the rear ends of the two oil outlet pipelines are connected to the manifold pipeline. The manifold pipeline is connected to the filtration and purification unit through the two oil outlet branch pipelines. Gear pumps are installed on the two oil outlet branch pipelines. The two gear pumps extract the high-temperature gear oil containing impurities from the main drive through the corresponding waste oil outlets and transfer it to the filtration and purification unit.
[0008] Furthermore, the filtration and purification unit includes two basket filters, a closed filter box, and an external vacuum filter. The ends of the two oil outlet branches are respectively connected to the oil inlet of the corresponding basket filters. The oil outlets of the two basket filters are respectively connected to the inlet of the closed filter box through pipes. The outlet of the closed filter box is connected to the inlet of the external vacuum filter through a pipe. The outlet of the external vacuum filter is connected to the cooling unit through a pipe.
[0009] Furthermore, the cooling unit includes a cooling oil tank and a finned plate cooler. The outlet end of the filtration and purification unit is connected to the inlet end of the cooling oil tank via a pipeline. The outlet end of the cooling oil tank is connected to two oil inlets via two oil inlet pipelines. Each oil inlet pipeline is equipped with a finned plate cooler, a gear pump, and a flow meter.
[0010] Furthermore, the cooling oil storage tank includes a tank body, a spiral cooling coil, and a PID controller. The PID controller is mounted on the tank body, and the spiral cooling coil is located inside the tank body. The inlet and outlet of the spiral cooling coil are connected to an external cooling water circulation system, respectively. A temperature control valve is installed at the outlet of the spiral cooling coil. The tank body has two oil outlets, which are connected to their corresponding oil inlet pipes. The side wall of the tank body has an integrated temperature sensor and a liquid level alarm.
[0011] Furthermore, the oil inlet of the closed filter box is equipped with two wire mesh filters.
[0012] Furthermore, the two waste oil outlets include a gear cavity triple oil cavity outlet and a bearing cavity six-port oil cavity outlet, and the two oil inlets include a bearing cavity oil inlet and a gear cavity oil inlet.
[0013] Furthermore, the spiral cooling coil includes an outer coil and an inner coil, with the inner coil being sleeved inside the outer coil and wound into a concentric circle structure.
[0014] Furthermore, a three-way diverter valve is installed at the connection between the bypass branch and the oil outlet pipeline.
[0015] Furthermore, the manifold is equipped with multiple one-way valves.
[0016] The beneficial effects of this utility model are:
[0017] 1. By using an external filtration and purification system, the purification capacity for waste oil is improved. At the same time, after being cooled by the cooling system, the oil is directly fed into the equipment, realizing integrated operation and solving the problem of low filtration efficiency and insufficient purification capacity of the original equipment's built-in filtration system.
[0018] 2. The cooling unit includes a cooling oil tank and a brazing plate cooler. The oil is cooled to below 60°C through the cooling oil tank, and then cooled again by the brazing plate cooler to ensure that the oil temperature entering the main drive is controlled within 45°C. The oil temperature is effectively controlled through two cooling processes.
[0019] 3. The basket filter, closed filter box and external vacuum filter in the purification unit adopt a three-stage series connection structure. The gear pump on the oil outlet branch is controlled by an external PLC control system to control the oil flow of the two pipelines respectively, so as to avoid cavitation or pressure buildup and extend the service life of the equipment.
[0020] 4. The purification unit adopts a three-stage purification process to improve purification capacity. It can not only remove larger fixed particles, but also dehydrate and degas through a vacuum oil filter to ensure the purity of the filtered oil.
[0021] 5. The waste oil settling tank is connected to the oil outlet pipeline system via a bypass branch. A three-way diverter valve is installed at the connection between the bypass branch and the oil outlet pipeline system. The three-way diverter valve switches the oil flow direction. When the system detects oil contamination (such as excessive particulate matter or increased moisture) or during regular maintenance, the valve body switches to the waste oil recovery path, and the oil flows to the waste oil settling tank through the bypass branch, preventing contaminated oil from circulating directly in the main drive. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of an external gear oil filtration and purification system. Labels: 1. Main drive; 2. Waste oil sedimentation tank; 3. Filtration and purification unit; 4. Cooling unit; 5. Oil outlet pipeline system; 6. Bypass branch; 7. Oil inlet pipeline; 8. Flow meter; 9. Cooling water circulation system; 11. Gear cavity triple oil outlet; 12. Bearing cavity six-port oil outlet; 13. Bearing cavity oil inlet; 14. Gear cavity oil inlet; 31. Basket filter; 32. Enclosed filter box; 33. External vacuum filter; 34. Pump #5; 41. Cooling oil storage tank; 42. Wire plate cooler; 43. PID controller; 44. Temperature sensor; 45. Liquid level alarm; 51. Oil outlet pipeline; 52. Manifold pipeline; 53. Oil outlet branch pipeline. 54. One-way valve, 55. Pump #3, 56. Pump #4, 71. Pump #1, 72. Pump #2, 321. Outer steel wire mesh filter, 322. Inner steel wire mesh filter, 323. Quick drain valve, 411. Housing, 412. Spiral cooling coil, 413. Temperature control valve. Detailed Implementation
[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0024] Reference Figure 1 As shown, this utility model provides an external gear oil filtration and purification system, including a main drive 1, a waste oil sedimentation tank 2, a filtration and purification unit 3, and a cooling unit 4. The main drive has two waste oil outlets and two oil inlets. The two waste oil outlets are connected to the filtration and purification unit 3 via an oil outlet pipeline system 5. The waste oil sedimentation tank 2 is connected to one of the pipelines in the oil outlet pipeline system 5 via a bypass branch 6. A three-way diverter valve is installed inside the connection port between the bypass branch 6 and the oil outlet pipeline. The outlet end of the filtration and purification unit 3 is connected to the inlet end of the cooling unit 4 via a pipeline. The outlet end of the cooling unit 4 is connected to the two oil inlets via two oil inlet pipelines 7. The two waste oil outlets include a gear cavity triple oil outlet 11 and a bearing cavity six-port oil outlet 12. The two oil inlets include a bearing cavity oil inlet 13 and a gear cavity oil inlet 14. The workflow includes: waste oil in the main drive 1 is transferred to the filtration and purification unit 3 through two waste oil outlets. After the oil undergoes multi-stage filtration and purification in the filtration and purification unit, it enters the cooling unit 4 to reduce the oil temperature, so that the oil flowing back to the main drive is controlled within 45°C.
[0025] Specifically, the oil outlet pipeline system 5 includes two oil outlet pipelines 51, a manifold pipeline 52, and two oil outlet branch pipelines 53. The front ends of the two oil outlet pipelines 51 are connected to the gear cavity triple oil outlet 11 and the bearing cavity six-port oil outlet 12, respectively. The rear ends of the two oil outlet pipelines are connected to the manifold pipeline 52. The manifold pipeline 52 is connected to the filtration and purification unit 3 through the two oil outlet branch pipelines 53. The manifold pipeline is equipped with multiple one-way valves 54 to prevent waste oil from flowing back into the main drive. Gear pumps are respectively installed on the two oil outlet branch pipelines 52. The gear pumps include pump #3 55 and pump #4 56. The two gear pumps (pump #3 55 and pump #4 56) respectively draw high-temperature gear oil containing impurities from the main drive through their corresponding waste oil outlets and transmit it to the filtration and purification unit 3. The preferred flow rates of pump #3 55 and pump #4 56 are 100 L / min and 70 L / min, respectively. The bypass branch 6 is located below the oil outlet pipe, and a three-way diverter valve is installed at the outlet of pump #4. As a core component of the oil distribution system, it can switch the oil flow direction according to system requirements. When the three-way diverter valve directs the oil to the main oil circuit (such as the filtration and purification unit), it maintains the normal operation of the equipment. When the system detects oil contamination (such as excessive particulate matter or increased moisture) or during regular maintenance, the valve switches to the waste oil recovery path, directing the oil through the bypass branch to the waste oil sedimentation tank, preventing contaminated oil from circulating directly in the main drive.
[0026] The filtration and purification unit 3 includes two basket filters 31, a closed filter box 32, and an external vacuum filter 33. The basket filters, closed filter box, and external vacuum filter are connected in a three-stage series configuration. Specifically, the ends of the two oil outlet branches 53 are connected to the oil inlet ends of the corresponding basket filters 31, and the oil outlet ends of the two basket filters 31 are connected to the inlet ends of the closed filter box 32 via pipes. The outlet end of the closed filter box 32 is connected to the inlet end of the external vacuum filter 33 via a pipe, and a pump 34 (No. 5) is installed on this pipe. The outlet end of the external vacuum filter 33 is connected to the cooling unit 4 via a pipe. The basket filter 31 contains a filter basket. Waste oil is filtered through the basket filter 31 to remove large particles of silt. The filtered oil is then transferred to a closed filter box 32. The closed filter box 32 has two wire mesh filters at its inlet for initial filtration, removing particulate silt. The outer wire mesh 321 preferably has a pore size of 1.0 mm, and the inner wire mesh 322 preferably has a pore size of 0.5 mm. The closed filter box is also equipped with a quick-drain valve 323, through which particulate silt is discharged. The initially filtered oil is then transferred to a vacuum oil filter 33. The vacuum oil filter 33 contains a fine filtration module, which dehydrates and degasses the oil, ensuring its purity through multi-stage filtration. The purified oil is then input into a cooling unit.
[0027] The cooling unit 4 includes a cooling oil storage tank 41 and a brazing plate cooler 42. The outlet end of the filtration and purification unit (specifically, the outlet end of the vacuum oil filter) is connected to the inlet end of the cooling oil storage tank 41 via a pipeline. The outlet end of the cooling oil storage tank is connected to two oil inlets (bearing cavity oil inlet 13 and gear cavity oil inlet 14) via two oil inlet pipelines. Each oil inlet pipeline 7 is equipped with a gear pump, a brazing plate cooler 42, and a flow meter 8. After the filtered high-temperature oil is initially cooled by the cooling oil storage tank (the oil is cooled to below 60°C), the two gear pumps draw the initially cooled oil into the oil inlet pipelines, and then further cooled by the brazing plate cooler (the oil is cooled to below 45°C). The second-cooled oil enters the oil inlet through the oil inlet pipeline. The high-temperature oil temperature is effectively controlled through two cooling processes. Among them, the gear pump includes pump 1# 71 and pump 2# 72. The gear pump controls the oil flow rate of the oil inlet pipeline and monitors the oil flow rate in real time through flow meter 8. The preferred flow rates of pump 1# and pump 2# are 140L / min and 70L / min, respectively.
[0028] Specifically, the cooling oil tank 41 includes a tank body 411, a spiral cooling coil 412 disposed within the inner cavity of the tank, and a PID controller. The tank body has two oil outlets, each connected to its corresponding oil inlet pipe 7. The spiral cooling coil 412 is welded to the tank body 411 to form an integral structure. The spiral cooling coil 412 includes an outer coil and an inner coil, with the inner coil nested inside the outer coil and wound into a concentric circle structure (the concentric circle structure is a conventional structure and is not illustrated in the attached drawings). The inlet and outlet of the spiral cooling coil are respectively connected to the cooling water circulation system 9. A temperature control valve 413 is installed at the outlet of the spiral cooling coil 412. The cooling water circulation system 1 inputs cooling water into the spiral cooling coil to exchange heat and cool the high-temperature oil in the cooling oil tank. The temperature control valve 413 monitors and controls the outlet temperature of the cooling water, making full use of the cooling water and improving the heat exchange effect. The cooling oil tank is equipped with a PID controller 43. The side wall of the tank has an integrated temperature sensor 44 and a liquid level alarm 45. The temperature sensor 44 monitors the oil temperature in real time and transmits the data to the PID controller 43. The PID controller ensures that the high-temperature oil temperature drops below 60°C before being output to the inlet pipeline. The brazing plate cooler 42 (plate cooler) utilizes multiple corrugated heat exchange plates, which are stacked, clamped, and bolted together. The brazing plate cooler further cools the oil after the initial cooling, ensuring that the oil temperature entering the bearing is controlled below 45°C.
[0029] Pumps 71, 72, 75, 76, and 72 are electrically connected to an external system flow balancing device to monitor and control their flow rates. The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Although this utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the utility model. Any person skilled in the art can make some modifications or alterations to the disclosed technical content to create equivalent embodiments without departing from the scope of this utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model, without departing from the scope of this utility model's technical solution, still fall within the scope of this utility model's technical solution.
Claims
1. An external gear oil filtration and purification system, characterized in that: The system includes a main drive, a waste oil settling tank, a filtration and purification unit, and a cooling unit. The main drive has two waste oil outlets and two oil inlets. The two waste oil outlets are connected to the filtration and purification unit through an oil outlet pipeline system. The outlet of the filtration and purification unit is connected to the inlet of the cooling unit through a pipeline. The outlet of the cooling unit is connected to the two oil inlets through two oil inlet pipelines. The waste oil settling tank is connected to one of the pipelines in the oil outlet pipeline system through a bypass branch.
2. The gear oil external filtration and purification system according to claim 1, characterized in that: The oil outlet pipeline system includes two oil outlet pipelines, a manifold pipeline, and two oil outlet branch pipelines. The front ends of the two oil outlet pipelines are connected to two waste oil outlets, and the rear ends of the two oil outlet pipelines are connected to the manifold pipeline. The manifold pipeline is connected to the filtration and purification unit through the two oil outlet branch pipelines. Gear pumps are installed on the two oil outlet branch pipelines. The two gear pumps extract the high-temperature gear oil containing impurities from the main drive through the corresponding waste oil outlets and transfer it to the filtration and purification unit.
3. The gear oil external filtration and purification system according to claim 2, characterized in that: The filtration and purification unit includes two basket filters, a closed filter box, and an external vacuum filter. The ends of two oil outlet branches are respectively connected to the oil inlet of the corresponding basket filter. The oil outlets of the two basket filters are respectively connected to the inlet of the closed filter box through pipes. The outlet of the closed filter box is connected to the inlet of the external vacuum filter through a pipe. The outlet of the external vacuum filter is connected to the cooling unit through a pipe.
4. A gear oil external filtration and purification system according to claim 1, 2, or 3, characterized in that: The cooling unit includes a cooling oil tank and a finned plate cooler. The outlet of the filtration and purification unit is connected to the inlet of the cooling oil tank via a pipeline. The outlet of the cooling oil tank is connected to two oil inlets via two oil inlet pipelines. Each oil inlet pipeline is equipped with a finned plate cooler, a gear pump, and a flow meter.
5. The gear oil external filtration and purification system according to claim 4, characterized in that: The cooling oil storage tank includes a tank body, a spiral cooling coil, and a PID controller. The PID controller is mounted on the tank body, and the spiral cooling coil is located inside the tank body. The inlet and outlet of the spiral cooling coil are connected to an external cooling water circulation system, and the outlet of the spiral cooling coil is equipped with a temperature control valve. The tank body has two oil outlets, which are connected to their corresponding oil inlet pipes. The side wall of the tank body has an integrated temperature sensor and a liquid level alarm.
6. The gear oil external filtration and purification system according to claim 3, characterized in that: The closed filter box is equipped with two wire mesh filters at the oil inlet.
7. A gear oil external filtration and purification system according to claim 1, 2, 3, 5, or 6, characterized in that: The two waste oil outlets include a gear cavity triple oil cavity outlet and a bearing cavity six-port oil cavity outlet, and the two oil inlets include a bearing cavity oil inlet and a gear cavity oil inlet.
8. The gear oil external filtration and purification system according to claim 5, characterized in that: The spiral cooling coil includes an outer coil and an inner coil, with the inner coil being sleeved inside the outer coil and wound into a concentric circle structure.
9. A gear oil external filtration and purification system according to claim 1, 2, 3, 5, or 8, characterized in that: A three-way diverter valve is installed at the connection between the bypass branch and the oil outlet pipeline.
10. A gear oil external filtration and purification system according to claim 2 or 3, characterized in that: The manifold is equipped with multiple one-way valves.