Marine intermediate bearing low-rotating-speed active oil supply system and oil supply method

Abstract

The invention relates to a low-rotating-speed active oil supply system and method for a marine intermediate bearing, and belongs to the technical field of shipbuilding. The active oil supply system comprises an intermediate bearing, an oil pump and an electric cabinet; the middle bearing comprises a bearing seat, a bearing cover and a bearing bush; lubricating grooves are formed in the bearing bushes; an oil injection port is formed in the vertex of the bearing cover and is communicated with the lubricating groove; an oil pool is arranged in the bearing seat; an oil outlet is formed in the bearing seat and is communicated with the oil pool; an oil inlet of the oil pump is connected with the oil outlet through a first pipeline, and an oil outlet of the oil pump is connected with the oil filling port through a second pipeline; the oil pump is connected with the electric cabinet through a power line; when the electric control box recognizes that the rotating speed of the intermediate shaft is lower than the preset rotating speed, the oil pump pumps lubricating oil in the oil pool and sends the lubricating oil to the oil injection port, and the lubricating oil flows into the lubricating groove from the oil injection port to form an oil film between the bearing bush and the intermediate shaft neck. The defect that the low-speed oil flinger of the intermediate shaft is insufficient in oil supply is overcome, the temperature of the intermediate bearing and the liquid level of the oil pool can be fed back in real time, and the alarm function is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a low-speed active oil supply system and an oil supply method for a ship intermediate bearing. Background Art

[0002] In ships, marine intermediate bearings are used to support the radial load of the ship's shaft system to ensure safe and reliable operation of the shaft system. Due to the development of ships in the field of polar icebreaking, the requirements for the heavy-load lubrication performance and safety monitoring performance of the intermediate bearings of the shaft system are becoming increasingly higher. The intermediate bearings are 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 shell, reduce bearing shell wear, and increase service life; the intermediate bearing status data is required to be monitored in real time and feedback is required to reduce losses caused by untimely fault detection.

[0003] At present, the lubricating oil of the intermediate bearing of the ship shaft system is usually supplied by an oil-slinging plate to achieve lubrication performance. The oil-slinging plate is fastened to the intermediate shaft, and the operation of the intermediate shaft drives the oil-slinging plate to rotate, bringing the lubricating oil from the oil pool of the intermediate bearing to between the bearing shell and the intermediate shaft journal, and forming an oil film to separate the two to ensure the smooth operation of the shaft system. However, during the use of ships, people found that the shaft system still has unstable rotation. Even if the lubrication structure is improved, the smooth rotation of the shaft system cannot be guaranteed.

[0004] Improvements to the lubrication structure, such as: Dongtai Marine Accessories Co., Ltd. designed an invention patent: CN117128247A, a ship intermediate bearing that can be stably lubricated, by increasing the oil output of the oil-throwing plate, continuously and stably supplying oil to the space between the intermediate shaft and the bearing. However, in actual use, it is still found that its lubrication performance still has large fluctuations. Hudong-Zhonghua Shipbuilding (Group) Co., Ltd. designed an invention patent: CN118088896A, an intermediate bearing emergency lubrication system and method, when the water cooling system of the intermediate bearing fails or loses its self-lubricating function, the intermediate bearing is connected to the main engine lubricating oil circulation tank to achieve emergency active lubrication. Due to the large number of intermediate bearings in the shaft system, they all need to be connected to the main engine lubricating oil circulation tank, which greatly increases the complexity of system control and piping.

[0005] In addition, the temperature of the ship's intermediate bearing is currently only monitored through a mechanical temperature measurement structure. The monitoring method is not intuitive and lacks feedback function. It is impossible to detect temperature changes and eliminate faults in time, and preventive maintenance cannot be performed. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned prior art, the inventors conducted in-depth research and found that the current research focused on the oil supply, but ignored an important issue: the speed of the intermediate shaft. Since the oil-slinging plate is fixedly connected to the intermediate shaft, the oil supply stability of the oil-slinging plate is not only affected by its own designed oil supply, but also by the speed of the intermediate shaft. The instability of bearing lubrication mainly comes from the insufficient oil supply below the critical speed state. When the speed is low enough, even if the oil-slinging plate has insufficient oil supply, the temperature change caused by the low temperature of the bearing itself, the low oil demand and insufficient oil supply are easily concealed, which conceals the fact that people find that the oil supply is insufficient at this time. When the speed of the intermediate shaft is higher than the critical speed state, the oil supply is very sufficient. Therefore, the conclusion obtained by the researchers is often that the oil supply of the oil-slinging plate is unstable, and then the oil-slinging plate is improved in various ways, but the expected effect is not achieved.

[0007] After discovering the above problems, the inventors of the present application have made targeted improvements and carried out targeted treatment of the oil supply under the critical speed of the oil-slinging plate, and provided a low-speed active oil supply system and oil supply method for a marine intermediate bearing, which utilizes the combined structure of the oil-slinging plate and the active oil supply structure to achieve reliable lubrication of the intermediate bearing, thereby improving the stability of the shaft system rotation. The structure is simple and the system control difficulty is low. At the same time, the system can also provide real-time feedback on the temperature of the intermediate bearing and the oil pool level, and has an alarm function to ensure that the fault of the intermediate bearing is discovered in time to eliminate it during the operation of the shaft system.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A low-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 mounted on the bearing seat, the bearing bush is mounted in the bearing seat and the bearing cover and is used to contact the intermediate shaft, and the bearing bush has a lubrication groove; an oil filling port is provided at the top of the bearing cover, and the oil filling port is communicated with the lubrication groove; an oil pool is provided in the bearing seat; an oil outlet is provided on the bearing seat, and the oil outlet is communicated with the oil pool;

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

[0012] When the electronic control box identifies that the intermediate shaft speed is lower than a predetermined speed (also called a critical speed), it controls the oil pump to start, and the oil pump extracts the lubricating oil in the oil pool through the first pipeline, and delivers the lubricating oil to the oil filling port through the second pipeline. The lubricating oil flows from the oil filling port into the lubrication groove to form an oil film between the bearing and the intermediate shaft journal.

[0013] Furthermore, the intermediate bearing also includes a first temperature sensor and a second temperature sensor; the first temperature sensor and the second temperature sensor are respectively connected to the electrical control box; 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 shell, so as to monitor the bearing shell temperature and transmit the bearing shell temperature to the electrical control box; the second temperature sensor is installed on the bearing seat, and its detection end extends into the oil pool, so as to monitor the lubricating oil temperature in the oil pool and transmit the lubricating oil temperature in the oil pool to the electrical control box.

[0014] Furthermore, the intermediate bearing also includes a liquid level sensor; the liquid level sensor is connected to the electrical control box; the liquid level sensor is installed on the bearing cover, and its detection end is located in the oil pool, which is used to monitor the lubricating oil level inside the intermediate bearing and transport the lubricating oil level to the electrical control box.

[0015] Furthermore, the electric control box 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 is connected to 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 to the input / output module respectively; when the electric control box recognizes that the temperature monitored by the first temperature sensor or the second temperature sensor exceeds a predetermined temperature, or recognizes that the lubricating oil monitored by the liquid level sensor is lower than a predetermined liquid level, the PLC controls the alarm module to alarm.

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

[0017] Furthermore, the diameters of the oil filling port and the oil outlet port are Φ4 to Φ10 mm.

[0018] Furthermore, the first pipeline and the second pipeline connecting the oil pump with the oil filling port and the oil outlet are copper pipes.

[0019] Furthermore, a bow end sealing plate and a stern end sealing plate are respectively installed at the front and rear ends of the oil pool on the bearing seat through bolts and gaskets; and the oil outlet is arranged on the stern end sealing plate.

[0020] Furthermore, the intermediate bearing also includes an oil hopper and an oil flinging plate; the oil hopper is installed in the bearing cover, the oil flinging plate is installed 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 shell.

[0021] The present invention also discloses a method for actively supplying oil to a marine intermediate bearing at a low speed, which uses the marine intermediate bearing low speed active oil supply system described in any one of the above to actively supply oil, and the method is as follows:

[0022] S1. The electric control box is adjusted to the manual mode through the mode selection button. When the oil pump start button is manually pressed, the PLC controls the oil pump to start through the power module. The oil pump extracts the lubricating oil in the oil pool and sends it to the lubrication groove of the intermediate bearing to lubricate the bearing shell and the intermediate shaft journal; the oil pump stop button is manually pressed, the PLC power module controls the oil pump to shut down, and the oil pump stops extracting lubricating oil; at the same time, the first temperature sensor and the second temperature sensor feed back the temperature information to the PLC in real time, and the liquid level sensor feeds back the lubricating oil liquid level data to the PLC in real time. The PLC displays the 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 shaft system speed of the intermediate shaft. When the shaft system speed is lower than the preset speed, the PLC controls the oil pump to automatically start through the power module. The oil pump 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 and the second temperature sensor feed back the temperature information to the PLC in real time, and the liquid level sensor feeds back the lubricating oil level data to the PLC in real time. The PLC displays the temperature information and lubricating oil level data in real time through the display.

[0024] S3, when PLC recognizes that the shaft system speed is higher than the preset speed, the oil pump is automatically shut down; the oil thrower brings the lubricating oil to the space between the bearing and the intermediate shaft journal for continued lubrication;

[0025] 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.

[0026] Beneficial effects of the present invention:

[0027] The low-speed active oil supply system and oil supply method for the intermediate bearing of a ship provided by the present invention can actively supply lubricating oil to the intermediate bearing, thereby ensuring the stability of the rotation of the shaft system by improving the lubrication reliability of the intermediate bearing. The system has a simple structure, low system control difficulty, convenient operation, and high intelligence.

[0028] The present invention starts active oil supply during the start-stop process of the shaft system and low-speed operation, which can reduce the wear of the bearing bush, effectively reduce the temperature rise of the intermediate bearing, increase the service life and reliability of the intermediate bearing, make up for the defect of insufficient passive oil supply of the oil-slinging plate, and ensure that the intermediate bearing always has good lubrication performance.

[0029] The present invention monitors the bearing shell temperature of the intermediate bearing, the lubricating oil temperature and the lubricating oil level in the oil pool in real time through temperature sensors, liquid level sensors and the like. When the PLC in the electric control box recognizes that the temperature information exceeds a preset temperature or the lubricating oil is lower than a preset liquid level, an alarm is issued to ensure that the fault of the intermediate bearing is discovered in time when the shaft system is running, so as to facilitate timely troubleshooting and avoid damage to key components of the intermediate bearing, which would affect the safe operation of the shaft system, thereby reducing the loss caused by untimely fault discovery.

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

[0031] The present invention can not only automatically control the start and stop of the oil pump through PLC, but also manually control the start and stop of the oil pump by using the oil pump start button and the oil pump stop button, so as to meet the use of different scenarios such as shaft system turning, shaft system start and stop, shaft system low speed operation and normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[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 filling port, 5-oil outlet, 6-mode selection button, 7-oil pump start button, 8-oil pump stop button. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] The terms such as upper, lower, left, right, inside, outside, front end, rear end, head, tail, etc. in this application document are based on the positions or positions shown in the drawings. If the drawings are different, the corresponding positions may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0036] In the present invention, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or mutual communication, a direct connection or an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] When conducting a reliability study on the lubrication performance of the intermediate bearings of the shafting of existing ships, it was found that the oil delivery of the oil-slinging plate would decrease as the shaft speed decreased. Even after reaching a certain shaft speed, the oil delivery of the oil-slinging plate was not enough to form an oil film between the journal and the bearing. At this time, the rotation of the intermediate shaft was unstable and the wear of the bearing was aggravated. This phenomenon is more obvious under the starting and stopping conditions of the ship. When the shafting is started, the journal starts to rotate from a stationary state and the speed gradually increases. At this time, the intermediate bearing is under a huge load, but the lubricating oil provided by the oil-slinging plate is insufficient. The oil film between the journal and the bearing has not been fully established, and it is in a state of boundary lubrication or mixed lubrication. The friction coefficient is large, the bearing wear is serious, and the temperature rise is high. During the shutdown process of the shafting, the speed gradually decreases, and the problem of the lubricating oil provided by the oil-slinging plate gradually decreasing and the oil film rupture is faced. The bearing is very easy to wear in the two stages of the shafting start and stop, and the bearing temperature rise is high, and the instantaneous energy consumption increases.

[0038] The present embodiment records a low-speed active oil supply system and oil supply method for a marine intermediate bearing, which is an improvement on a conventional marine intermediate bearing. Lubricating oil is actively supplied to the intermediate bearing when the intermediate shaft is at a low speed to ensure the lubrication reliability of the intermediate bearing when the oil slinger plate does not supply enough oil. The system can also monitor the bearing temperature, lubricating oil temperature, and lubricating oil level inside the intermediate bearing in real time, and has an alarm function to promptly detect intermediate bearing faults and facilitate operators to eliminate the faults in a timely manner.

[0039] like Figure 1 As shown, 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 shell of the intermediate bearing 1 and the journal of the intermediate shaft.

[0040] The intermediate bearing 1 of this embodiment includes a bearing seat 1.1, a bearing cover 1.2, a bearing bushing, an oil-slinging plate, an oil-filling hopper, a cooling coil, an oil seal, a bow end sealing plate, a stern end sealing plate 1.3, a first temperature sensor 1.4, a second temperature sensor 1.5, and a liquid level sensor 1.6. Among them, the bearing seat 1.1 is a supporting structure of the intermediate bearing 1, and the bearing seat 1.1 is installed on the hull or other foundation surface through foot bolts to support the weight of the shaft system and ensure the safe operation of the shaft system. The oil pool is arranged in the bearing seat 1.1, and the bow end sealing plate and the stern end sealing plate 1.3 are respectively installed on the bearing seat 1.1 at the front and rear ends of the oil pool through bolts or other fasteners, and the bow end sealing plate and the stern end sealing plate 1.3 are fastened and sealed with the bearing seat 1.1 through bolts and gaskets. The bearing cover 1.2 is installed on the bearing seat 1.1 through bolts, and the intermediate bearing 1 is sealed through an oil seal to prevent the leakage of lubricating oil in the intermediate bearing 1 and external pollutants from entering the interior of the intermediate bearing 1. The bearing shell is installed in the bearing seat 1.1 and the bearing cover 1.2. The intermediate shaft passes through the bearing shell. The intermediate bearing 1 contacts the intermediate shaft through the bearing shell, and the bearing shell is provided with a lubrication groove at one end close to the journal of the intermediate shaft. The oil-slinging plate is a split structure, which is fastened to the intermediate shaft by bolts. The oil-slinging plate rotates under the operation of the intermediate shaft. The oil-filling hopper is installed in the bearing cover 1.2. The oil-slinging plate and the oil-filling hopper are in clearance fit. The oil-filling hopper is connected to the lubrication groove on the bearing shell. The oil-slinging plate throws the lubricating oil in the oil pool into the oil-filling hopper, and the oil-filling hopper sends the lubricating oil to the lubrication groove for passive oil supply to meet the lubrication between the bearing shell and the journal of the intermediate shaft. The cooling coil is arranged in the bearing cover 1.2 and is connected to the cooling system of the ship through a pipeline to prevent the intermediate bearing 1 from overheating and affecting the lubrication effect and the service life of the intermediate bearing 1. The first temperature sensor 1.4 is installed at the lower part of the intermediate bearing 1, and the detection end of the first temperature sensor 1.4 is inserted into the bearing shell to monitor the bearing shell temperature. The second temperature sensor 1.5 is mounted on the stern end sealing plate 1.3, and its detection end extends into the oil pool to monitor the temperature of the lubricating oil in the oil pool. The liquid level sensor 1.6 is mounted on the bearing cover 1.2, and its detection end is inserted into the oil pool to monitor the lubricating oil level in the intermediate bearing 1.

[0041] The oil pump 2 is installed on the bearing seat 1.1 by bolts. An oil filling port 4 is provided at the center vertex just above the bearing cover 1.2 of the intermediate bearing 1, and the oil filling port 4 is connected to the lubrication groove of the bearing shell of the intermediate bearing 1. An oil outlet 5 is provided on the stern end sealing plate 1.3, and the oil outlet 5 is connected to the oil pool. The oil outlet 5 is connected to the first pipeline of the oil pump 2 through a joint, and the oil outlet of the oil pump 2 is connected to the oil filling port 4 just above the intermediate bearing 1 through a second pipeline. When the oil pump 2 is started, the lubricating oil in the oil pool is drawn to the oil filling port 4, and the lubricating oil is transported to the lubrication groove of the bearing shell through the oil filling port 4, so as 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 filling port 4 and the oil outlet 5 can be consistent, and the diameter size can be set according to the specifications of the intermediate bearing 1, and the diameter is usually Φ4-Φ10mm. The first and second pipelines connecting the oil pump 2 with the oil filling port 4 and the oil outlet 5 can be copper pipes to prevent the pipelines from rusting and contaminating the lubricating oil.

[0043] The electric control box 3 is installed on the hull by bolts and is located beside the intermediate bearing 1. The electric control box 3 includes a power module, a PLC, an input / output module, a relay module, a display module, and an alarm module. The PLC is connected to the input / output module, the relay module, the display module, and the alarm module respectively, and the power module is connected to the relay module.

[0044] The shaft speed sensor, 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 through signal lines. The input / output module transmits the received shaft speed, temperature information, and liquid level information to the PLC and displays them on the display through the display module to monitor the bearing temperature, the temperature in the oil pool, and the lubricating oil level data in real time. The oil pump 2 is connected to the power module through a power line. The mode selection button 6, the oil pump start button 7, and the oil pump stop button 8 are installed on the electric control box 3. The mode selection button 6, the oil pump start button 7, and the oil pump stop button 8 are connected to the PLC through the input / output module. The mode selection button 6 can switch between manual mode and automatic mode. The oil pump start button 7 and the oil pump stop button 8 can input the start and stop signals of the oil pump 2 to the PLC respectively. In the manual mode, the electric control box 3 can manually control the start and stop of the oil pump 2 through the oil pump start button 7 and the oil pump stop button 8. In the automatic mode, the PLC of the electric control box 3 automatically starts and stops the oil pump 2 based on the shaft speed.

[0045] An alarm light or a horn may also be provided on the electric control box 3, and the alarm light or the horn is connected to the alarm module, and the alarm module emits light or sound to issue an alarm through the alarm light or the horn. When the PLC receives that the bearing temperature exceeds a predetermined temperature, the lubricating oil temperature exceeds a predetermined temperature, or the lubricating oil is lower than a predetermined liquid level, the PLC activates the alarm light or the horn through the alarm module, and the electric control box 3 issues an over-temperature alarm and a lubricating oil low liquid 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 be manual mode or automatic mode. The method is as follows:

[0047] 1. The electric control box 3 is adjusted to the manual mode through 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 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; 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 in real time through the display;

[0048] 2. The electric control box 3 is adjusted to the automatic mode through the mode selection button 6. At this time, the electric control box 3 does not have the function of manually controlling the start and stop of the oil pump 2; the PLC in the electric control box 3 identifies the shaft system speed of the intermediate shaft. When the shaft system speed is lower than the predetermined speed (such as 30r / min), the PLC controls the oil pump 2 to start automatically through the relay module and the power module. The oil pump 2 extracts the lubricating oil in the oil pool and sends it to the lubrication groove to lubricate the bearing 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 liquid level data to the PLC in real time. The PLC displays the temperature information and the lubricating oil liquid level data in real time through the display;

[0049] 3. When the PLC recognizes that the shaft system speed is higher than the preset speed, the oil pump 2 is automatically shut down; the oil thrower 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 real-time temperature of the front and rear intermediate bearing bushes of the active oil supply system of this embodiment is detected by the above method, and the average temperature is calculated as shown in the following table:

[0052]

[0053] It can be seen from the test that the active oil supply system of this embodiment can effectively reduce the temperature rise of the intermediate bearing by 3-5° C. after actively supplying oil to the intermediate bearing at low speed.

[0054] Although the principles of the present invention are described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely explanations of the exemplary implementations of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention, and any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, fall within the protection scope of the present invention.

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 shell; the bearing cover (1.2) is mounted on the bearing seat (1.1), the bearing shell is mounted in the bearing seat (1.1) and the bearing cover (1.2) and is used to contact the intermediate shaft, and the bearing shell 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 electronic 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 delivers 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 a marine intermediate bearing according to claim 1 is characterized in that: The intermediate bearing 1 also includes 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 installed at the lower part of the intermediate bearing (1), and the detection end of the first temperature sensor (1.4) is inserted into the bearing shell to monitor the bearing shell temperature and transmit the bearing shell temperature to the electric control box (3); the second temperature sensor (1.5) is installed on the bearing seat (1.1), and the detection end thereof extends into the oil pool to monitor the lubricating oil temperature in the oil pool and transmit the lubricating oil temperature in the oil pool to the electric control box (3).

3. The low-speed active oil supply system for a marine intermediate bearing according to claim 2 is 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), and its detection end is located in the oil pool, and is used to monitor the lubricating oil level inside the intermediate bearing (1) and to convey 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 is characterized in that: The electric control box (3) comprises 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) identifies that the temperature monitored by the first temperature sensor (1.4) or the second temperature sensor (1.5) exceeds a predetermined temperature, or identifies 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 a marine intermediate bearing 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 an oil pump (2) start signal; and the oil pump stop button (8) is used to manually input an oil pump (2) stop signal.

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) by means of 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) also includes an oil filling hopper and an oil throwing plate; the oil filling hopper is installed in the bearing cover (1.2), the oil throwing plate is installed on the intermediate shaft, the oil throwing plate and the oil filling hopper are clearance-matched, and the oil filling hopper is connected to the lubrication groove of the bearing shell.

10. A method for actively supplying oil to a marine intermediate bearing at low speed, characterized in that: Active oil supply is performed by 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; the oil pump stop button (8) is manually pressed, and 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 the temperature information to the PLC in real time, and the liquid level sensor (1.6) feeds back the lubricating oil liquid level data to the PLC in real time, and the PLC displays the temperature data and the lubricating oil liquid level data in real time through 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, 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, 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, the liquid level sensor (1.6) feeds back the lubricating oil liquid level data to the PLC in real time, and the PLC displays the temperature information and the lubricating oil liquid level data in real time through 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-slinging 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.

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