Automatic oil supplementing system of diesel generator

Abstract

An automatic oil recharging system of a diesel generator comprises an oil storage tank, an oil recharging pump and a daily oil tank, an oil supply port of the oil storage tank is connected with an oil inlet of the daily oil tank through a conveying pipeline, the oil recharging pump is installed on the conveying pipeline, and a high liquid level sensor and a low liquid level sensor are installed on the daily oil tank. The high liquid level sensor and the low liquid level sensor control starting and stopping of the oil supplementing pump through the controller, a flow sensor and a pressure sensor are installed on the conveying pipeline on the outlet side of the oil supplementing pump, and the flow sensor and the pressure sensor are electrically connected with the controller. When the flow sensor and the pressure sensor monitor that the flow and the pressure in the conveying pipeline are lower than those in a normal operation state, a maintainer comprehensively judges the mechanical state of the oil supplementing pump, so that a maintenance plan can be input, and the maintainer is arranged to carry out maintenance by using a gap in which the oil supplementing pump stops operating; and emergency maintenance is not needed after the oil recharging pump cannot supply oil, so that reliable operation of the oil recharging system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel generators in offshore unmanned flexible direct current converter stations, in particular to an automatic oil replenishment system for diesel generators. Background Art

[0002] Nowadays, offshore wind power and offshore photovoltaic projects are booming. The offshore unmanned flexible direct current converter station is an important node in the power transmission and transformation process, and the diesel generator serves as an emergency backup power source and is the only power source after the offshore flexible direct current converter station loses power. Therefore, for unmanned offshore flexible direct current converter stations, timely replenishment of diesel is particularly important. In order to ensure the operation of the diesel generator, the diesel generator's oil replenishment system must be kept in good condition to ensure the safe and stable operation of the offshore flexible direct current converter station. In the oil replenishment system of the diesel generator, the oil storage tank 10 is connected to the daily oil tank 30 through the delivery pipeline 20. The replenishment pump is installed on the delivery pipeline 20 to pump the diesel in the oil storage tank 10 to the daily oil tank 30. A high liquid level sensor 31 and a low liquid level sensor 32 are installed on the daily oil tank. The high liquid level sensor 31 and the low liquid level sensor 32 control the start and stop of the replenishment pump through the controller 50. When the low liquid level sensor 32 sends a signal, it means that the liquid level in the daily oil tank 30 is at a low level. The controller 50 controls the replenishment pump to start pumping oil. When the high liquid level sensor 31 sends a signal, it means that the liquid level in the daily oil tank 30 reaches a high level. The controller 50 controls the replenishment pump to stop running. The controller 50 is connected to the control system of the unmanned offshore flexible direct current converter station. The control system sends the control status of the controller 50 to the remote control center for monitoring to achieve unmanned operation. In the process of automatic oil replenishment, the operating status of the oil replenishment pump is the key to the stable operation of the entire oil replenishment system. Therefore, it is very necessary to monitor the operating status of the oil replenishment pump.

[0003] Chinese patent document CN220726393U, publication (announcement) date: 2024.04.05, discloses an automatic oil replenishing device and an oil supply system. The automatic oil replenishing device controls the start and stop of the oil pump according to the oil level in the oil tank of the oil supply system, and can automatically inject oil into the oil tank of the oil supply system when the oil supply system loses pressure. However, the patent does not involve monitoring the operating status of the oil pump.

[0004] In addition, Chinese patent document CN216665956U, published (announcement) date: 2022.06.03, discloses an unattended water pump unit status monitoring system, including a water pump unit and an electrical control cabinet placed in the machine room. The machine room is also equipped with a WIFI module, a lighting module, a server and a ventilation and heat dissipation module for reducing the ambient temperature in the machine room. The ventilation and heat dissipation module, the WIFI module, the lighting module, the server and the parameters of each water pump unit are all recorded in the storage system in the server, and the server establishes a communication connection with the external base station through the WIFI module. The operating status and operating parameters of multiple functional modules including the water pump unit are recorded in the storage system in the server. The staff can understand the operating status of the pump station unit in real time through mobile or PC access, and issue remote control commands through the wireless network, realizing the centralized status monitoring and maintenance management of multiple pump station units in different areas, and solving the problem of insufficient maintenance personnel. However, in this patent, the start and stop status of the water pump unit is mainly monitored, and the mechanical status of the water pump unit is not involved. Monitoring. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to solve the problems existing in the above-mentioned background technology, and to provide an automatic oil replenishment system for a diesel generator, by installing a flow sensor and a pressure sensor on the delivery pipeline on the replenishment outlet side of the replenishment pump, the flow sensor and the pressure sensor are used to monitor the flow and pressure in the delivery pipeline, and to judge the operating state of the replenishment pump. When the flow sensor and the pressure sensor monitor that the flow and pressure in the delivery pipeline are lower than the flow and pressure in the normal operating state, it can be included in the maintenance plan and personnel can be arranged for maintenance, instead of waiting until the replenishment pump fails to supply oil for emergency maintenance, thereby ensuring the reliable operation of the replenishment system.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a diesel generator automatic oil replenishing system, including an oil storage tank, an oil replenishing pump and a daily oil tank, the oil supply port of the oil storage tank is connected to the oil inlet of the daily oil tank through a delivery pipe, the oil replenishing pump is installed on the delivery pipe, and a high liquid level sensor and a low liquid level sensor are installed on the daily oil tank. The high liquid level sensor and the low liquid level sensor control the start and stop of the oil replenishing pump through a controller, and a flow sensor and a pressure sensor are installed on the delivery pipe on the outlet side of the oil replenishing pump, and the flow sensor and the pressure sensor are electrically connected to the controller.

[0007] The oil replenishment pump includes a first oil pump and a second oil pump, the first oil pump and the second oil pump are connected in parallel, a first electric stop valve is installed on the pipeline on the outlet side of the first oil pump, and a second electric stop valve is installed on the pipeline on the outlet side of the second oil pump. An auxiliary liquid level sensor is also installed on the daily oil tank between the high liquid level sensor and the low liquid level sensor, and the auxiliary liquid level sensor is electrically connected to the controller. The first oil pump, the second oil pump, the first electric stop valve and the second electric stop valve are controlled by the controller.

[0008] A first liquid level gauge is installed on the daily oil tank, and the first liquid level gauge is electrically connected to the controller.

[0009] The delivery pipeline is further provided with a first valve and a second valve, and an oil replenishment pump, a flow sensor and a pressure sensor are located between the first valve and the second valve.

[0010] A second liquid level gauge is also installed on the oil storage tank, and the second liquid level gauge is electrically connected to the controller.

[0011] The daily oil tank is also provided with an overflow pipe, which is communicated with the oil storage tank.

[0012] The utility model has the following beneficial effects:

[0013] 1. The flow sensor and pressure sensor of the utility model are used to monitor the flow and pressure in the delivery pipeline and to comprehensively judge the mechanical state of the oil replenishment pump. When the flow sensor and pressure sensor monitor that the flow and pressure in the delivery pipeline are lower than the flow and pressure in the normal operating state, the maintenance personnel comprehensively judge the mechanical state of the oil replenishment pump, so that they can schedule it into the maintenance plan and arrange personnel to use the interval when the oil replenishment pump stops running to perform maintenance, instead of waiting until the oil replenishment pump cannot supply oil for emergency maintenance, thereby ensuring the reliable operation of the oil replenishment system.

[0014] 2. An auxiliary liquid level sensor is also installed on the daily fuel tank of the utility model between the high liquid level sensor and the low liquid level sensor. When the oil level in the daily fuel tank rises to the position of the auxiliary liquid level sensor, the controller receives the signal of the auxiliary liquid level sensor, and the controller controls the first oil pump and the first electric stop valve to close, and controls the second oil pump and the second electric stop valve to start, so as to pump the remaining diesel through the second oil pump until the high liquid level sensor sends a signal, and the controller controls the second oil pump and the second electric stop valve to close. During the entire oil replenishment process, the first oil pump is the main and the second oil pump is the auxiliary. The flow rate and pressure of the first oil pump and the second oil pump during operation can be detected by the flow sensor and the pressure sensor, respectively, to comprehensively judge whether the mechanical status of the first oil pump and the second oil pump is normal. This avoids the situation where the second oil pump cannot operate after the first oil pump fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 This is a system block diagram of the utility model.

[0017] Figure 2 This is the control block diagram of the utility model.

[0018] In the figure:

[0019] Oil storage tank 10, second liquid level gauge 11;

[0020] Delivery pipeline 20, first valve 21, first oil pump 22, first electric stop valve 23, second oil pump 24, second electric stop valve 25, flow sensor 26, pressure sensor 27, second valve 28;

[0021] Daily oil tank 30, high liquid level sensor 31, low liquid level sensor 32, first liquid level gauge 33, auxiliary liquid level sensor 34;

[0022] Overflow pipe 40, controller 50. DETAILED DESCRIPTION

[0023] See also Figure 1-2 , an automatic oil replenishment system for a diesel generator, comprising an oil storage tank 10, an oil replenishment pump and a daily oil tank 30, the oil supply port of the oil storage tank 10 is connected to the oil inlet of the daily oil tank 30 through a delivery pipeline 20, the oil replenishment pump is installed on the delivery pipeline 20, a high liquid level sensor 31 and a low liquid level sensor 32 are installed on the daily oil tank 30, the high liquid level sensor 31 and the low liquid level sensor 32 control the start and stop of the oil replenishment pump through a controller 50, a flow sensor 26 and a pressure sensor 27 are installed on the delivery pipeline 20 on the outlet side of the oil replenishment pump, and the flow sensor 26 and the pressure sensor 27 are electrically connected to the controller 50. The flow sensor 26 and the pressure sensor 27 are used to monitor the flow and pressure in the delivery pipeline 20, and are used to comprehensively judge the mechanical state of the oil replenishment pump. When the flow sensor 26 and the pressure sensor 27 detect that the flow rate and pressure in the delivery pipeline 20 are lower than the flow rate and pressure in the normal operating state, the maintenance personnel comprehensively judge the mechanical state of the oil replenishment pump, so as to schedule it into the maintenance plan and arrange personnel to perform maintenance during the interval when the oil replenishment pump stops running, instead of waiting until the oil replenishment pump can no longer supply oil for emergency maintenance, thereby ensuring the reliable operation of the oil replenishment system.

[0024] Preferably, the flow sensor 26 is an intelligent liquid turbine flow meter of model HER-LWGY.

[0025] Preferably, the pressure sensor 27 adopts a pipeline pressure transmitter of the ZK-3351 series.

[0026] Preferably, the controller 50 adopts PLC.

[0027] When the oil replenishment pump operates normally, the flow rate and pressure in the delivery pipeline 20 can be measured multiple times when the oil replenishment pump is intact.

[0028] When the oil replenishment pump is running, the controller 50 obtains the data measured by the flow sensor 26 and the pressure sensor 27 in real time. The controller 50 is connected to the control system of the unmanned offshore flexible direct current converter station, and the control system sends the data of the flow sensor 26 and the pressure sensor 27 to the remote control center.

[0029] Furthermore, the oil replenishment pump includes a first oil pump 22 and a second oil pump 24, the first oil pump 22 and the second oil pump 24 are connected in parallel, a first electric stop valve 23 is installed on the pipeline on the outlet side of the first oil pump 22, a second electric stop valve 25 is installed on the pipeline on the outlet side of the second oil pump 24, an auxiliary liquid level sensor 34 is also installed on the daily oil tank 30 between the high liquid level sensor 31 and the low liquid level sensor 32, the auxiliary liquid level sensor 34 is electrically connected to the controller 50, and the first oil pump 22, the second oil pump 24, the first electric stop valve 23 and the second electric stop valve 25 are controlled by the controller 50. The redundant design of the oil replenishment pump improves the reliability of the oil replenishment system. When the system is running, when the low liquid level sensor 32 sends a signal, the controller 50 controls the first oil pump 22 and the first electric stop valve 23 to open, and the second oil pump 24 and the second electric stop valve 25 are in a closed state. When the oil level in the daily fuel tank 30 rises to the position of the auxiliary liquid level sensor 34, the position of the auxiliary liquid level sensor 34 is close to the high liquid level sensor 31, and the controller 50 receives the signal of the auxiliary liquid level sensor 34. The controller 50 controls the first oil pump 22 and the first electric stop valve 23 to close, and controls the second oil pump 24 and the second electric stop valve 25 to start, so as to pump the remaining diesel through the second oil pump 24 until the high liquid level sensor 31 sends a signal. The controller 50 controls the second oil pump 24 and the second electric stop valve 25 to close. During the process of the second oil pump 24 pumping oil, the flow rate and pressure of the second oil pump 24 when pumping oil are detected by the flow sensor 26 and the pressure sensor 27, which are used to comprehensively judge whether the mechanical state of the second oil pump 24 is normal.

[0030] Furthermore, a first liquid level gauge 33 is installed on the daily oil tank 30, and the first liquid level gauge 33 is electrically connected to the controller 50. The specific oil level in the daily oil tank 30 can be detected by the first liquid level gauge 33.

[0031] Preferably, the first liquid level gauge 33 is a magnetic flap liquid level gauge.

[0032] Furthermore, the delivery pipeline 20 is also equipped with a first valve 21 and a second valve 28, and the oil replenishment pump, the flow sensor 26 and the pressure sensor 27 are located between the first valve 21 and the second valve 28. The first valve 21 and the second valve 28 are preferably manual stop valves, so that the first oil pump 22 and the second oil pump 24 can be inspected and repaired after the first valve 21 and the second valve 28 are manually closed during inspection and repair. Of course, the first valve 21 can also be installed on the parallel pipelines on the inlet sides of the first oil pump 22 and the second oil pump 24, respectively.

[0033] Furthermore, a second level gauge 11 is installed on the oil storage tank 10, and the second level gauge 11 is electrically connected to the controller 50. The second level gauge 11 is used to detect the oil level in the oil storage tank 10, so as to timely replenish diesel in the oil storage tank 10. The second level gauge 11 is preferably a magnetostrictive level gauge.

[0034] Furthermore, the daily oil tank 30 is also provided with an overflow pipe 40, which is connected to the oil storage tank 10. When the first liquid level gauge 33 fails, the daily oil tank 30 returns to the oil storage tank 10 from the overflow pipe 40 to ensure safety.

[0035] The working principle or action process of the utility model is as follows:

[0036] When the system is running, when the low liquid level sensor 32 sends a signal, the controller 50 controls the first oil pump 22 and the first electric stop valve 23 to open, and the second oil pump 24 and the second electric stop valve 25 are in a closed state. When the oil level in the daily oil tank 30 rises to the position of the auxiliary liquid level sensor 34, the controller 50 receives the signal of the auxiliary liquid level sensor 34, and the controller 50 controls the first oil pump 22 and the first electric stop valve 23 to close, and controls the second oil pump 24 and the second electric stop valve 25 to start, so as to pump the remaining diesel through the second oil pump 24, until the high liquid level sensor 31 sends a signal, and the controller 50 controls the second oil pump 24 and the second electric stop valve 25 to close. During the whole oil replenishment process, the first oil pump 22 is the main and the second oil pump 24 is the auxiliary. The flow rate and pressure of the first oil pump 22 and the second oil pump 24 during operation can be detected by the flow sensor 26 and the pressure sensor 27, respectively, to comprehensively judge whether the mechanical state of the first oil pump 22 and the second oil pump 24 is normal. This avoids the situation where the second oil pump 24 cannot operate after the first oil pump 22 fails. When making a comprehensive judgment, the current and temperature of the oil pump motor can be combined for judgment. The current can be obtained through the frequency converter, and the temperature can be obtained by installing a temperature sensor on the motor. When it comes to specific applications, the frequency converter and the temperature sensor are electrically connected to the controller respectively.

[0037] The controller of this system is used to collect and forward sensor signals, as well as basic control functions. It is a conventional technical means of the controller and does not involve any improvement to the software.

Claims

1. An automatic oil replenishment system for a diesel generator, comprising an oil storage tank (10), an oil replenishment pump and a daily oil tank (30), wherein the oil supply port of the oil storage tank (10) is connected to the oil inlet port of the daily oil tank (30) through a delivery pipeline (20), the oil replenishment pump is installed on the delivery pipeline (20), and a high liquid level sensor (31) and a low liquid level sensor (32) are installed on the daily oil tank (30), and the high liquid level sensor (31) and the low liquid level sensor (32) control the start and stop of the oil replenishment pump through a controller (50), characterized in that: A flow sensor (26) and a pressure sensor (27) are installed on the delivery pipeline (20) at the outlet side of the oil replenishment pump, and the flow sensor (26) and the pressure sensor (27) are electrically connected to the controller (50).

2. The automatic oil replenishment system for a diesel generator according to claim 1, characterized in that: The oil replenishment pump comprises a first oil pump (22) and a second oil pump (24), the first oil pump (22) and the second oil pump (24) are connected in parallel, a first electric stop valve (23) is installed on the pipeline on the outlet side of the first oil pump (22), and a second electric stop valve (25) is installed on the pipeline on the outlet side of the second oil pump (24), an auxiliary liquid level sensor (34) is also installed on the daily oil tank (30) between the high liquid level sensor (31) and the low liquid level sensor (32), the auxiliary liquid level sensor (34) is electrically connected to the controller (50), and the first oil pump (22), the second oil pump (24), the first electric stop valve (23) and the second electric stop valve (25) are controlled by the controller (50).

3. The automatic oil replenishment system for a diesel generator according to claim 1 is characterized in that: A first liquid level gauge (33) is installed on the daily oil tank (30), and the first liquid level gauge (33) is electrically connected to the controller (50).

4. The automatic oil replenishment system for a diesel generator according to claim 1, characterized in that: A first valve (21) and a second valve (28) are also installed on the delivery pipeline (20), and an oil replenishment pump, a flow sensor (26) and a pressure sensor (27) are located between the first valve (21) and the second valve (28).

5. The automatic oil replenishment system for a diesel generator according to claim 1, characterized in that: A second liquid level gauge (11) is also installed on the oil storage tank (10), and the second liquid level gauge (11) is electrically connected to the controller (50).

6. The automatic oil replenishment system for a diesel generator according to claim 1, characterized in that: The daily oil tank (30) is also provided with an overflow pipe (40), and the overflow pipe (40) is in communication with the oil storage tank (10).

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