A low-speed active oil supply system and method for a marine intermediate bearing

Abstract

The present invention relates to a low-speed active oil supply system and oil supply method for a marine intermediate bearing, belonging to the technical field of shipbuilding. The active oil supply system comprises an intermediate bearing, an oil pump, and an electronic control box. The intermediate bearing comprises a bearing seat, a bearing cover, and a bearing shell. The bearing shell has a lubrication groove. An oil filling port is provided at the top of the bearing cover, the oil filling port communicating with the lubrication groove. An oil pool is provided within the bearing seat. An oil outlet is provided on the bearing seat, the oil outlet communicating with the oil pool. The oil inlet of the oil pump is connected to the oil outlet via a first pipeline, and the oil outlet of the oil pump is connected to the oil filling port via a second pipeline. The oil pump is connected to the electronic control box via a power cord. When the electronic control box recognizes that the intermediate shaft speed is lower than a predetermined speed, the oil pump draws lubricating oil from the oil pool and delivers it to the oil filling port. The lubricating oil flows from the oil filling port into the lubrication groove, forming an oil film between the bearing shell and the intermediate shaft journal. The present invention overcomes the disadvantage of insufficient oil supply from the intermediate shaft's low-speed oil slinger pan and can provide real-time feedback on the intermediate bearing temperature and oil pool level, thus providing an alarm function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shipbuilding, in particular to a low-speed active oil supply system for a marine intermediate bearing and an oil supply method. BACKGROUND

[0002] In a ship, a marine intermediate bearing is used to support the radial load of the shafting of the ship to ensure the safe and reliable operation of the shafting. Due to the development of polar icebreaking ships, the requirements for the lubrication performance and safety monitoring performance of the heavy load of the intermediate bearing are becoming higher and higher. The intermediate bearing is required to have good lubrication performance under heavy load conditions to ensure the formation of a wedge-shaped gap between the shaft and the bearing bush, reduce the wear of the bearing bush, and improve the service life. The state data of the intermediate bearing is required to be monitored in real time and fed back to reduce the loss caused by the failure to discover the fault in time.

[0003] Currently, the lubricating oil of the intermediate bearing of the ship shafting is usually supplied by a oil flinger to achieve lubrication performance. The oil flinger is fastened to the intermediate shaft and is driven to rotate by the rotation of the intermediate shaft, bringing the lubricating oil from the oil pool of the intermediate bearing to the space between the bearing bush and the intermediate shaft neck, and forming an oil film to separate the two to ensure the stable operation of the shafting. However, during the use of the ship, it is found that the shafting is still unstable in rotation, and even if the lubrication structure is improved, it cannot guarantee the stable rotation of the shafting.

[0004] Improvements to the lubrication structure, such as the invention patent CN117128247A A kind of marine intermediate bearing capable of stable lubrication designed by Dongtai Marine Parts Co., Ltd., continuously supplies oil between the intermediate shaft and the bearing bush by increasing the oil supply amount of the oil flinger. However, in actual use, it is still found that the lubrication performance still has large fluctuations. The invention patent CN118088896A An emergency lubrication system and method for intermediate bearing designed by Shanghai Dongfang Zhonghua Shipbuilding (Group) Co., Ltd. When the water cooling system of the intermediate bearing fails or loses the self-lubrication function, the intermediate bearing is lubricated by connecting the main engine lubricating oil circulating cabin. Since the number of intermediate bearings of the shafting is large, they all need to be connected to the main engine lubricating oil circulating cabin, greatly increasing the complexity of system control and piping.

[0005] In addition, the marine intermediate bearing currently only monitors the temperature through a mechanical temperature measurement structure, the monitoring means is not intuitive, and lacks feedback function, cannot timely discover temperature changes and eliminate faults, and cannot perform preventive maintenance. SUMMARY

[0006] In view of the deficiencies in the prior art, the inventors have found that current researches focus on the oil supply amount, but ignore an important problem: the rotating speed of the intermediate shaft. Since the oil throwing disc is fixedly connected with the intermediate shaft, the oil supply stability of the oil throwing disc is not only affected by the designed oil supply amount of the oil throwing disc itself, but also affected by the rotating speed of the intermediate shaft. The instability of bearing lubrication mainly results from the insufficient oil supply amount when the rotating speed is below the critical state. When the rotating speed is low enough, even if the oil supply of the oil throwing disc is insufficient, the temperature change caused by the insufficient oil supply can be easily covered up due to the low temperature of the bearing and the low oil supply demand, so that people cannot find the insufficient oil supply. When the rotating speed of the intermediate shaft is higher than the critical state, the oil supply is sufficient, so the researchers often draw the conclusion that the oil supply of the oil throwing disc is unstable, and then improve the oil throwing disc in various ways, but the desired effect cannot be achieved.

[0007] After discovering the above problems, the inventors of the present application have made targeted improvements on the oil supply of the oil throwing disc under the critical rotating speed, and provided a low rotating speed active oil supply system for a marine intermediate bearing and an oil supply method. The low rotating speed active oil supply system for the marine intermediate bearing comprises an intermediate bearing, an oil pump and an electric control box.

[0008] To achieve the above object, the present application provides the following technical scheme:

[0009] A low rotating speed active oil supply system for a marine intermediate bearing, the active oil supply system comprising an intermediate bearing, an oil pump and an electric control box.

[0010] The intermediate bearing comprises a bearing seat, a bearing cover and a bearing bush. The bearing cover is installed on the bearing seat, and the bearing bush is installed in the bearing seat and the bearing cover and used to contact with the intermediate shaft. The bearing bush has a lubricating groove. The bearing cover is provided with an oil inlet at the top, and the oil inlet is communicated with the lubricating groove. An oil pool is arranged in the bearing seat. An oil outlet is arranged on the bearing seat and communicated with the oil pool.

[0011] The oil pump is installed on the bearing seat. The oil inlet of the oil pump is connected with the oil outlet through a first pipeline, and the oil outlet of the oil pump is connected with the oil inlet of the bearing cover through a second pipeline. The oil pump is connected with the electric control box through a power line.

[0012] The electric control box recognizes that the intermediate shaft speed is lower than the predetermined speed (also known as critical speed), and controls the oil pump to start. The oil pump extracts the lubricating oil in the oil pool through the first pipeline, and sends the lubricating oil to the oil inlet through the second pipeline. The lubricating oil flows into the lubricating groove from the oil inlet to form an oil film between the bearing bush and the intermediate shaft journal.

[0013] Further, the intermediate bearing further comprises a first temperature sensor and a second temperature sensor; the first temperature sensor and the second temperature sensor are connected with the electric control box respectively; the first temperature sensor is installed at the lower part of the intermediate bearing, and the detection end of the first temperature sensor is inserted into the bearing bush for monitoring the temperature of the bearing bush and transmitting the temperature of the bearing bush to the electric control box; the second temperature sensor is installed on the bearing seat, and the detection end of the second temperature sensor extends into the oil pool for monitoring the temperature of the lubricating oil in the oil pool and transmitting the temperature of the lubricating oil in the oil pool to the electric control box.

[0014] Further, the intermediate bearing further comprises a liquid level sensor; the liquid level sensor is connected with the electric control box; the liquid level sensor is installed on the bearing cover, and the detection end of the liquid level sensor is located in the oil pool for monitoring the liquid level of the lubricating oil in the intermediate bearing and transmitting the liquid level of the lubricating oil to the electric control box.

[0015] Further, the electric control box comprises a power module, a PLC, an input / output module and an alarm module; the PLC is connected with the power module, the input / output module and the alarm module respectively; the oil pump is connected with the power module through the power line, and the PLC controls the start and stop of the oil pump through the power module; the first temperature sensor, the second temperature sensor and the liquid level sensor are connected with the input / output module respectively; when the temperature monitored by the first temperature sensor or the second temperature sensor exceeds the predetermined temperature, or when the liquid level monitored by the liquid level sensor is lower than the predetermined liquid level, the PLC controls the alarm module to alarm.

[0016] Further, the electric control box is provided with a mode selection button, an oil pump start button and an oil pump stop button; the mode selection button, the oil pump start button and the oil pump stop button are connected with the PLC through the input / output module respectively; the mode selection button is used to switch between automatic mode and manual mode; the oil pump start button is used to manually input the oil pump start signal; the oil pump stop button is used to manually input the oil pump stop signal.

[0017] Further, the diameter of the oil inlet and the oil outlet is Φ4-Φ10mm.

[0018] Further, the first pipeline and the second pipeline, which are connected with the oil inlet and the oil outlet of the oil pump, are copper pipes.

[0019] Further, the front end plate and the rear end plate are respectively installed on the front end and the rear end of the oil pool of the bearing seat through bolts and gaskets; and the oil outlet is arranged on the rear end plate.

[0020] Further, the intermediate bearing further comprises an oil injection tank and an oil throwing disc; the oil injection tank is installed in the bearing cover, the oil throwing disc is installed on the intermediate shaft, the oil throwing disc is in clearance fit with the oil injection tank, and the oil injection tank is connected with the lubricating groove of the bearing bush.

[0021] The application further discloses a low-speed active oil supply method for the intermediate bearing of a ship, which is implemented by using the low-speed active oil supply system for the intermediate bearing of a ship.

[0022] S1, the electric control box is adjusted to the manual mode through the mode selection button, the oil pump start button is manually pressed, the PLC controls the oil pump to be turned on through the power module, the oil pump extracts the lubricating oil in the oil pool and sends the lubricating oil to the lubricating groove of the intermediate bearing to lubricate the space between the bearing bush and the intermediate shaft neck, the oil pump stop button is manually pressed, the PLC power module controls the oil pump to be turned off, and the oil pump stops extracting the lubricating oil; meanwhile, the first temperature sensor and the second temperature sensor feed back temperature information to the PLC in real time, the liquid level sensor feeds back lubricating oil liquid level data to the PLC in real time, and the PLC displays temperature data and lubricating oil liquid level data in real time through the display.

[0023] S2, the electric control box is adjusted to the automatic mode through the mode selection button, the PLC in the electric control box identifies the shafting speed of the intermediate shaft, when the shafting speed is lower than a predetermined speed, the PLC controls the oil pump to be automatically turned on through the power module, the oil pump extracts the lubricating oil in the oil pool and sends the lubricating oil to the lubricating groove to lubricate the space between the bearing bush and the intermediate shaft neck, meanwhile, the first temperature sensor and the second temperature sensor feed back temperature information to the PLC in real time, the liquid level sensor feeds back lubricating oil liquid level data to the PLC in real time, and the PLC displays temperature information and lubricating oil liquid level data in real time through the display.

[0024] S3, when the PLC identifies that the shafting speed is higher than the predetermined speed, the PLC controls the oil pump to be automatically turned off, and the oil throwing disc brings the lubricating oil to the space between the bearing bush and the intermediate shaft neck to continue lubricating.

[0025] S4, in any of the above steps, when the PLC identifies that the temperature of the bearing bush or the temperature of the lubricating oil is higher than a predetermined temperature, or the lubricating oil is lower than a predetermined liquid level, the PLC alarms through the alarm module.

[0026] The application has the following beneficial effects:

[0027] The ship intermediate bearing low-speed active oil supply system and oil supply method can actively supply lubricating oil to the intermediate bearing, improve the lubricating reliability of the intermediate bearing, and ensure the stability of the shafting rotation

[0028] The application actively supplies oil during the shafting start-stop process and low-speed operation, reduces the wear of the bearing bush, effectively reduces the temperature rise of the intermediate bearing, improves the service life and reliability of the intermediate bearing, makes up for the defects of passive oil supply of the oil throwing disc, and ensures that the intermediate bearing always has good lubricating performance.

[0029] The application monitors the temperature of the bearing bush, the temperature of the lubricating oil, and the liquid level state of the lubricating oil in the oil pool in real time through temperature sensors, liquid level sensors, etc., and the PLC in the electric control box alarms when the temperature information exceeds the predetermined temperature or the lubricating oil is lower than the predetermined liquid level, so as to ensure that the fault of the intermediate bearing is found in time during the operation of the shafting, facilitate timely troubleshooting, avoid damage to the key components of the intermediate bearing, and affect the safe operation of the shafting, thereby reducing the loss caused by the failure to find the fault in time.

[0030] The application controls the oil pump to send the lubricating oil in the oil pool to the oil injection port through the electric control box, has a simple structure, is convenient for optimizing and improving the existing intermediate bearing, and has low production and maintenance costs.

[0031] The application not only can automatically control the start and stop of the oil pump through the PLC, but also can manually control the start and stop of the oil pump through the oil pump start button and the oil pump stop button, so as to meet the use of different scenes such as shafting turning, shafting start-stop, shafting low-speed operation, and normal operation. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic view of the marine intermediate bearing low-speed active oil supply system.

[0033] Among them: 1-intermediate bearing, 1.1-bearing seat, 1.2-bearing cover, 1.3-stern end sealing plate, 1.4-first temperature sensor, 1.5-second temperature sensor, 1.6-liquid level sensor, 2-oil pump, 3-electric control box, 4-oil injection port, 5-oil outlet, 6-mode selection button, 7-oil pump start button, 8-oil pump stop button. DETAILED DESCRIPTION

[0034] The specific embodiments of the application will be further described in detail below in combination with the drawings and examples. The following examples are only used to illustrate the application, but not to limit the scope of the application.

[0035] The up, down, left, right, inner, outer, front end, rear end, head, tail and other orientation or positional relationship terms in the present application file are established based on the orientation or positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly, so it cannot be understood as a limitation on the scope of protection.

[0036] In the present application, the terms "mounting", "connection", "interface", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, it can also be detachable connection, it can also be integrally connected, it can also be mechanical connection, it can also be electrical connection or can communicate with each other, it can also be direct connection, it can also be indirect connection through an intermediate medium, it can be the interconnection of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the reliability study of the lubrication performance of the intermediate bearing of the existing ship shafting, it is found that the oil delivery capacity of the oil throwing disc decreases with the decrease of the shaft speed, and even when the shaft speed reaches a certain value, the oil delivery capacity of the oil throwing disc is insufficient to form an oil film between the shaft neck and the bearing bush. At this time, the rotation of the intermediate shaft is unstable, and the bearing bush is severely worn. This phenomenon is more obvious during the start and stop of the ship. When the shafting starts, the shaft neck starts to rotate from a stationary state, and the speed gradually increases. At this time, the intermediate bearing is subjected to a large load, but the lubricating oil provided by the oil throwing disc is insufficient, and the oil film between the shaft neck and the bearing bush has not been completely established, and is in a boundary lubrication or mixed lubrication state, with a large friction coefficient, severe bearing bush wear, and high temperature rise. During the shutdown process of the shafting, the speed gradually decreases, and the problem of gradually reducing the lubricating oil provided by the oil throwing disc and the oil film breaking. The bearing bush is easily worn during the start and stop of the shafting, and the temperature rise of the bearing bush is high, and the instantaneous energy consumption increases.

[0038] The present embodiment describes a low-speed active oil supply system and method for a marine intermediate bearing, which improves the conventional marine intermediate bearing. The intermediate bearing is actively supplied with lubricating oil at low speed of the intermediate shaft to ensure the lubrication reliability of the intermediate bearing in the case of insufficient oil supply of the oil throwing disc, and to monitor the temperature of the bearing bush, the temperature of the lubricating oil, and the internal lubricating oil level of the intermediate bearing in real time, and has an alarm function to timely discover the failure of the intermediate bearing and facilitate the operator to timely eliminate the failure.

[0039] As shown in Figure 1 The system includes an intermediate bearing 1, an oil pump 2, and an electric control box 3. The oil pump 2 actively supplies oil to the intermediate bearing 1 under the control of the PLC in the electric control box 3 to meet the lubrication between the bearing bush of the intermediate bearing 1 and the intermediate shaft neck.

[0040] The intermediate bearing 1 of the embodiment comprises a bearing seat 1.1, a bearing cover 1.2, a bearing bush, an oil throwing disc, an oil injection tank, a cooling coil, an oil seal, a bow end plate, a stern end plate 1.3, a first temperature sensor 1.4, a second temperature sensor 1.5, and a liquid level sensor 1.6. The bearing seat 1.1 is a support structure of the intermediate bearing 1, which is installed on the ship body or other base surface by means of foot bolts to support the shafting weight and ensure the safe operation of the shafting. The oil pool is arranged in the bearing seat 1.1, and the bow end plate and the stern end plate 1.3 are installed on the bearing seat 1.1 at the front and rear ends of the oil pool by means of bolts or other fasteners, and the bow end plate and the stern end plate 1.3 are tightly sealed with the bearing seat 1.1 by means of bolts and gaskets. The bearing cover 1.2 is installed on the bearing seat 1.1 by means of bolts and is sealed by means of the oil seal to avoid the leakage of lubricating oil in the intermediate bearing 1 and the entry of external pollutants into the intermediate bearing 1. The bearing bush is installed in the bearing seat 1.1 and the bearing cover 1.2, the intermediate shaft passes through the bearing bush, the intermediate bearing 1 contacts the intermediate shaft through the bearing bush, and the bearing bush is provided with a lubricating groove at one end close to the intermediate shaft neck. The oil throwing disc is of a split structure and is tightly fastened on the intermediate shaft by means of bolts and rotates under the driving of the intermediate shaft. The oil injection tank is installed in the bearing cover 1.2, the oil throwing disc is gap-fitted with the oil injection tank, the oil injection tank is connected with the lubricating groove on the bearing bush, the oil throwing disc throws the lubricating oil in the oil pool into the oil injection tank, the oil injection tank sends the lubricating oil to the lubricating groove for passive oil supply to meet the lubrication between the bearing bush and the intermediate shaft neck. The cooling coil is arranged in the bearing cover 1.2 and is connected with the cooling system of the ship through a pipeline to prevent the temperature of the intermediate bearing 1 from being too high to affect the lubrication effect and the service life of the intermediate bearing 1. The first temperature sensor 1.4 is installed at a lower position of the intermediate bearing 1, and the detection end of the first temperature sensor 1.4 is inserted into the bearing bush to monitor the temperature of the bearing bush. The second temperature sensor 1.5 is installed on the stern end plate 1.3, the detection end of the second temperature sensor 1.5 is inserted into the oil pool to monitor the temperature of the lubricating oil in the oil pool. The liquid level sensor 1.6 is installed on the bearing cover 1.2, the detection end of the liquid level sensor 1.6 is inserted into the oil pool to monitor the liquid level of the lubricating oil in the intermediate bearing 1.

[0041] The oil pump 2 is installed on the bearing seat 1.1 by means of bolts. An oil injection port 4 is arranged at the center top point of the bearing cover 1.2 of the intermediate bearing 1, and the oil injection port 4 is communicated with the lubricating groove of the bearing bush of the intermediate bearing 1. An oil outlet 5 is arranged on the stern end plate 1.3, the oil outlet 5 is communicated with the oil pool, the oil outlet 5 is connected with the first pipeline of the oil pump 2 through a joint, the oil outlet of the oil pump 2 is connected with the oil injection port 4 above the intermediate bearing 1 through a second pipeline, the oil pump 2 draws the lubricating oil in the oil pool to the oil injection port 4 when the oil pump 2 is started, the lubricating oil is delivered to the lubricating groove of the bearing bush through the oil injection port 4 to actively supply oil to the intermediate bearing 1 and ensure the lubrication of the intermediate bearing 1.

[0042] Preferably, the diameters of the oil inlet 4 and the oil outlet 5 are the same, and can be set according to the specifications of the intermediate bearing 1, typically ranging from Φ4 to Φ10 mm. The first and second pipes connecting the oil pump 2 to the oil inlet 4 and the oil outlet 5 can be copper pipes to prevent rust and contamination of the lubricating oil.

[0043] The electrical control box 3 is bolted to the hull, located next to the intermediate bearing 1. It contains a power module, a programmable logic controller (PLC), an input / output module, a relay module, a display module, and an alarm module. The PLC is connected to the input / output module, relay module, display module, and alarm module, respectively. The power module is connected to the relay module.

[0044] The shaft speed sensor, first temperature sensor 1.4, second temperature sensor 1.5, and liquid level sensor 1.6 are connected to the input / output module via signal cables. The I / O module transmits the received shaft speed, temperature, and liquid level information to the PLC, which displays it on the display module for real-time monitoring of bearing temperature, oil sump temperature, and lubricant level. The oil pump 2 is connected to the power module via a power cable. The electrical control box 3 is equipped with a mode selection button 6, an oil pump start button 7, and an oil pump stop button 8. These buttons are connected to the PLC via the I / O module. The mode selection button 6 switches between manual and automatic modes. The oil pump start button 7 and the oil pump stop button 8 respectively input start and stop signals for the oil pump 2 to the PLC. In manual mode, the oil pump start button 7 and the oil pump stop button 8 allow manual control of the oil pump 2. In automatic mode, the PLC automatically starts and stops the oil pump 2 based on the shaft speed.

[0045] The electrical control box 3 may also be equipped with an alarm light or horn, which is connected to the alarm module. The alarm module uses the alarm light or horn to emit light or sound to issue an alarm. When the PLC receives information that the bearing temperature exceeds a predetermined temperature, the lubricating oil temperature exceeds a predetermined temperature, or the lubricating oil level falls below a predetermined level, the PLC activates the alarm light or horn through the alarm module, and the electrical control box 3 issues an over-temperature alarm or low-lubricating oil level alarm through light and sound.

[0046] The low-speed active oil supply system for the marine intermediate bearing of this embodiment actively supplies oil when the intermediate shaft rotates at a low speed. The oil supply method can adopt manual mode or automatic mode. The method is as follows:

[0047] 1. The electric control box 3 is adjusted to manual mode via the mode selection button 6. At this time, the electric control box 3 does not have the function of automatically controlling the start and stop of the oil pump 2 by determining the shaft speed signal; the operator manually presses the oil pump start button 7, and the PLC controls the oil pump 2 to start through the relay module and the power module according to the manual oil pump 2 start signal. The oil pump 2 extracts the lubricating oil from the oil pool and sends it to the lubrication groove of the intermediate bearing 1 to lubricate the bearing shell and the intermediate shaft journal; the oil pump stop button 8 is manually pressed, and the PLC controls the oil pump 2 to stop extracting lubricating oil and shut down through the relay module and the power module according to the manual oil pump 2 shutdown signal. At the same time, the first temperature sensor 1.4 and the second temperature sensor 1.5 feed back the temperature information to the PLC in real time, and the liquid level sensor 1.6 feeds back the lubricating oil level data to the PLC in real time. The PLC displays the temperature data and lubricating oil level data on the display in real time.

[0048] 2. The electronic control box 3 is set to automatic mode using the mode selection button 6. In this case, the electronic control box 3 does not have the function of manually controlling the start and stop of the oil pump 2. The PLC in the electronic control box 3 identifies the shaft system speed of the intermediate shaft. When the shaft system speed drops below a predetermined speed (e.g., 30 r / min), the PLC controls the oil pump 2 to automatically start via the relay module and the power module. The oil pump 2 draws lubricating oil from the oil pool and delivers it to the lubrication groove to lubricate the bearing shell and the intermediate shaft journal. At the same time, the first temperature sensor 1.4 and the second temperature sensor 1.5 provide real-time temperature information to the PLC, and the liquid level sensor 1.6 provides real-time lubricating oil level data to the PLC. The PLC displays the temperature information and lubricating oil level data on the display.

[0049] 3. When the PLC recognizes that the shaft speed is higher than the preset speed, the oil pump 2 is automatically shut down; the oil slinger brings the lubricating oil to the space between the bearing and the intermediate shaft journal for continued lubrication;

[0050] 4. In any of the above steps, when the PLC recognizes that the bearing temperature or the lubricating oil temperature exceeds the predetermined temperature, or the lubricating oil is lower than the predetermined liquid level, the PLC will alarm through the alarm module.

[0051] The above method is used to detect the real-time temperature of the front and rear intermediate bearing bushes of the active oil supply system of this embodiment, and the average temperature is calculated as shown in the following table:

[0052]

[0053] Tests have shown that the active oil supply system of this embodiment can effectively reduce the temperature rise of the intermediate bearing by 3 to 5° C. by actively supplying oil to the intermediate bearing at low speed.

[0054] Although the principles of the present application have been described in connection with the preferred embodiments thereof with reference to the drawings, it should be understood that the application is not limited to the construction and arrangements of the preferred embodiments as set forth above and above and that several other changes, modifications, equivalents, substitutions and alterations can be made thereto without departing from the spirit and scope of the present application.

Claims

1. A low-speed active oil supply system for a marine intermediate bearing, characterized in that: The active oil supply system comprises an intermediate bearing (1), an oil pump (2), and an electric control box (3); The intermediate bearing (1) comprises a bearing seat (1.1), a bearing cover (1.2), and a bearing bush; the bearing cover (1.2) is mounted on the bearing seat (1.1), the bearing bush is mounted in the bearing seat (1.1) and the bearing cover (1.2), and is used for contacting the intermediate shaft, and the bearing bush has a lubrication groove; an oil filling port (4) is provided at the top of the bearing cover (1.2), and the oil filling port (4) is communicated with the lubrication groove; an oil pool is provided in the bearing seat (1.1); an oil outlet (5) is provided on the bearing seat (1.1), and the oil outlet (5) is communicated with the oil pool; The oil pump (2) is mounted on the bearing seat (1.1); the oil inlet of the oil pump (2) is connected to the oil outlet (5) via a first pipeline, and the oil outlet of the oil pump (2) is connected to the oil filling port (4) via a second pipeline; the oil pump (2) is connected to the electric control box (3) via a power line; When the electric control box (3) recognizes that the intermediate shaft speed is lower than a predetermined speed, it controls the oil pump (2) to start, and the oil pump (2) extracts the lubricating oil in the oil pool through the first pipeline, and sends the lubricating oil to the oil filling port (4) through the second pipeline. The lubricating oil flows from the oil filling port (4) into the lubrication groove to form an oil film between the bearing shell and the intermediate shaft journal.

2. The low-speed active oil supply system for marine intermediate bearings according to claim 1, characterized in that: The intermediate bearing 1 further comprises a first temperature sensor (1.4) and a second temperature sensor (1.5); the first temperature sensor (1.4) and the second temperature sensor (1.5) are respectively connected to the electric control box (3); the first temperature sensor (1.4) is mounted on the lower part of the intermediate bearing (1), and the detection end of the first temperature sensor (1.4) is inserted into the interior of the bearing shell, for monitoring the bearing shell temperature and transmitting the bearing shell temperature to the electric control box (3); the second temperature sensor (1.5) is mounted on the bearing seat (1.1), and the detection end thereof extends into the oil pool, for monitoring the lubricating oil temperature in the oil pool and transmitting the lubricating oil temperature in the oil pool to the electric control box (3).

3. The low-speed active oil supply system for marine intermediate bearings according to claim 2, characterized in that: The intermediate bearing (1) further comprises a liquid level sensor (1.6); the liquid level sensor (1.6) is connected to the electric control box (3); the liquid level sensor (1.6) is mounted on the bearing cover (1.2), with its detection end located in the oil pool, for monitoring the lubricating oil level inside the intermediate bearing (1) and conveying the lubricating oil level to the electric control box (3).

4. The low-speed active oil supply system for a marine intermediate bearing according to claim 3, characterized in that: The electric control box (3) includes a power module, a PLC, an input / output module, and an alarm module; the PLC is connected to the power module, the input / output module, and the alarm module respectively; the oil pump (2) is connected to the power module via the power line, and the PLC controls the start and stop of the oil pump (2) via the power module; the first temperature sensor (1.4), the second temperature sensor (1.5), and the liquid level sensor (1.6) are connected to the input / output module respectively; when the electric control box (3) recognizes that the temperature monitored by the first temperature sensor (1.4) or the second temperature sensor (1.5) exceeds a predetermined temperature, or recognizes that the lubricating oil monitored by the liquid level sensor (1.6) is lower than a predetermined liquid level, the PLC controls the alarm module to alarm.

5. The low-speed active oil supply system for marine intermediate bearings according to claim 4, characterized in that: The electric control box (3) is provided with a mode selection button (6), an oil pump start button (7), and an oil pump stop button (8). The mode selection button (6), the oil pump start button (7), and the oil pump stop button (8) are respectively connected to the PLC through the input / output module; the mode selection button (6) is used to switch between automatic mode and manual mode; the oil pump start button (7) is used to manually input a start signal of the oil pump (2); and the oil pump stop button (8) is used to manually input a stop signal of the oil pump (2).

6. The low-speed active oil supply system for a marine intermediate bearing according to claim 1, characterized in that: The diameters of the oil filling port (4) and the oil outlet port (5) are Φ4 to Φ10 mm.

7. The low-speed active oil supply system for a marine intermediate bearing according to claim 1, characterized in that: The first pipeline and the second pipeline connecting the oil pump (2) with the oil filling port (4) and the oil outlet (5) are copper pipes.

8. The low-speed active oil supply system for a marine intermediate bearing according to claim 1, characterized in that: A bow end sealing plate and a stern end sealing plate (1.3) are respectively mounted on the front and rear ends of the oil pool on the bearing seat (1.1) via bolts and gaskets; the oil outlet (5) is arranged on the stern end sealing plate (1.3).

9. The low-speed active oil supply system for a marine intermediate bearing according to claim 1, characterized in that: The intermediate bearing (1) further comprises an oil hopper and an oil flinging plate; the oil hopper is mounted in the bearing cover (1.2), the oil flinging plate is mounted on the intermediate shaft, the oil flinging plate and the oil hopper are clearance-matched, and the oil hopper is connected to the lubrication groove of the bearing bush.

10. A method for actively supplying oil to a marine intermediate bearing at low speed, characterized in that: Active oil supply is performed using the low-speed active oil supply system for a marine intermediate bearing according to any one of claims 1 to 9, and the method is as follows: S1, the electric control box (3) is adjusted to the manual mode through the mode selection button (6), and when the oil pump start button (7) is manually pressed, the PLC controls the oil pump (2) to start through the power module, and the oil pump (2) extracts the lubricating oil in the oil pool and sends it to the lubrication groove of the intermediate bearing (1) to lubricate the bearing shell and the intermediate shaft journal; when the oil pump stop button (8) is manually pressed, the PLC controls the oil pump (2) to stop through the power module, and the oil pump (2) stops extracting lubricating oil; at the same time, the first temperature sensor (1.4) and the second temperature sensor (1.5) feed back temperature information to the PLC in real time, and the liquid level sensor (1.6) feeds back lubricating oil level data to the PLC in real time, and the PLC displays the temperature data and lubricating oil level data in real time on the display; S2, the electric control box (3) is adjusted to the automatic mode through the mode selection button (6), the PLC in the electric control box (3) identifies the shaft system speed of the intermediate shaft, and when the shaft system speed is lower than the predetermined speed, the PLC controls the oil pump (2) to automatically start through the power module, and the oil pump (2) extracts the lubricating oil in the oil pool and sends it to the lubrication groove to lubricate the bearing shell and the intermediate shaft journal; at the same time, the first temperature sensor (1.4) and the second temperature sensor (1.5) feed back the temperature information to the PLC in real time, and the liquid level sensor (1.6) feeds back the lubricating oil level data to the PLC in real time, and the PLC displays the temperature information and the lubricating oil level data in real time on the display; S3, when the PLC recognizes that the shaft speed is higher than the predetermined speed, the oil pump (2) is automatically shut down; The oil slinger pan brings the lubricating oil to the space between the bearing shell and the intermediate shaft journal for continued lubrication; S4. In any of the above steps, when the PLC recognizes that the bearing temperature or the lubricating oil temperature exceeds the predetermined temperature, or the lubricating oil is lower than the predetermined liquid level, the PLC issues an alarm through the alarm module.

Images