Oil pump interlocking start-up delay prevention system of unit lubricating oil system

Abstract

The utility model relates to the field of petroleum refining, in particular to an oil pump interlocking start-up delay prevention system of a unit lubricating oil system. One side of the oil tank is connected with four pipelines, two pipelines are respectively connected with a common inlet filter and a standby inlet filter, the other two pipelines are respectively connected with a common safety valve and a standby safety valve, the common inlet filter and the common safety valve are respectively connected with a common oil pump, and the standby inlet filter and the standby safety valve are respectively connected with a standby oil pump. The common oil pump is connected with a common one-way valve which is connected with a common stop valve, and the standby oil pump is connected with a standby one-way valve which is connected with a standby stop valve. A small hole is formed in the center of a valve plate of the standby one-way valve. The problems that oil pressure cannot reach the pressure required by lubricating oil within the set time when a standby oil pump is started in an interlocking mode, and consequently a unit is shut down, an oil system rises suddenly, the oil pressure is lowered when a safety valve jumps, and the unit is shut down due to low oil pressure in an interlocking mode are solved.

Description

Technical Field

[0001] This utility model relates to the field of petroleum refining, and in particular to a system for preventing delays in the start-up of an oil pump in a unit's lubricating oil system. Background Technology

[0002] Existing large-scale generator unit lubrication stations typically have two oil pumps. Each pump outlet includes a check valve, shut-off valve, and safety valve. The two pumps ultimately converge to supply oil to various lubrication points of the generator unit. During normal operation, one pump operates while the other is interlocked and on standby. When a fault occurs in the oil system and the oil pressure drops below the set value, the standby pump automatically starts to maintain the required oil pressure, which is sufficient under normal operating conditions. However, in winter when the ambient temperature is too low, the lubricating oil in the standby pump pipeline is cold, its viscosity increases, and its fluidity is poor. When the standby pump starts automatically, the oil system struggles to reach the required oil pressure within the specified time, ultimately leading to a generator unit shutdown due to lubricating oil pressure interlock. Another situation arises when the standby pump starts automatically; due to the impact of the lubricating oil, the oil pressure often exceeds the safety valve's set pressure, causing the safety valve to trip. Simultaneously, the system oil pressure drops, affecting the generator unit's lubrication system and causing a generator unit shutdown due to interlock. Therefore, a generator unit lubrication system with an interlocked pump start-up delay prevention system is urgently needed. Utility Model Content

[0003] The purpose of this utility model is to provide a system for preventing delays in the interlocking start-up of oil pumps in a generator set's lubrication system. This system aims to address the problem of generator set shutdowns caused by the oil pressure failing to reach the required lubrication pressure within a specified time during the interlocking start-up of the standby oil pump in a large generator set's lubrication system. It also addresses the risk of safety valve activation during the interlocking start-up of the standby oil pump in a large generator set due to a sudden increase in oil pressure. When the safety valve activates, the oil pressure drops, potentially causing the generator set to shut down due to low oil pressure interlocking.

[0004] A unit lubrication oil system pump interlock start-up anti-delay system includes an oil tank. Four pipes are connected to one side of the oil tank. Two pipes are connected to a normal inlet filter and a standby inlet filter, respectively. The other two pipes are connected to a normal safety valve and a standby safety valve, respectively. The normal inlet filter and the normal safety valve are connected to a normal oil pump via pipes. The standby inlet filter and the standby safety valve are connected to a standby oil pump via pipes. The normal oil pump is connected to a normal check valve via pipes. The normal check valve is connected to a normal shut-off valve. The standby oil pump is connected to a standby check valve via pipes. The standby check valve is connected to a standby shut-off valve. The normal shut-off valve and the standby shut-off valve are connected to external pipes. A small hole is opened in the center of the valve plate of the standby check valve.

[0005] Optionally, the diameter of the small hole is 1-3 mm.

[0006] Optionally, the commonly used oil pump and the standby oil pump are centrifugal pumps or gear pumps.

[0007] Optionally, the commonly used safety valve and the standby safety valve are spring-loaded safety valves or counterweight safety valves.

[0008] Optionally, the commonly used check valve and the standby shut-off valve are interlocked and electrically connected, and the standby check valve and the commonly used shut-off valve are interlocked and electrically connected.

[0009] Optionally, the commonly used check valve and the spare check valve are ball check valves or baffle check valves.

[0010] Optionally, the oil tank is equipped with a heating device or a heat preservation device.

[0011] Optionally, a level gauge or pressure gauge is provided outside the oil tank.

[0012] Optionally, the system may include a controller or an alarm.

[0013] Optionally, the commonly used inlet filter, the commonly used safety valve, the commonly used oil pump, the commonly used check valve, and the commonly used shut-off valve are commonly used pipelines, and the spare inlet filter, the spare safety valve, the spare oil pump, the spare check valve, and the spare shut-off valve are spare pipelines, with the commonly used pipelines and the spare pipelines symmetrically distributed.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This application solves the problem that when the standby check valve starts automatically, the oil system has difficulty reaching the oil pressure requirement within a specified time, which ultimately leads to the unit shutting down due to lubricating oil pressure interlock.

[0016] 2. This application solves the problem of the oil pressure often exceeding the set pressure value of the safety valve when the standby pump starts automatically due to the impact of lubricating oil, which causes the safety valve to open. At the same time as the opening, the system oil pressure drops, which in turn affects the unit's lubrication system and causes the unit to be interlocked and shut down.

[0017] 3. This application sets up a shut-off valve to interlock the commonly used check valve and the standby shut-off valve. The standby check valve and the commonly used shut-off valve prevent the two oil pumps from running at the same time, which would cause excessive oil pressure or excessive oil flow and affect the lubrication effect.

[0018] 4. This application uses a heating device or a heat preservation device to maintain the lubricating oil in the oil tank at a suitable temperature, so as to avoid the lubricating oil viscosity from increasing and the fluidity from being poor when the ambient temperature is too low in winter, which would affect the start-up and operation of the oil pump.

[0019] 5. This application makes the lubricating oil level and pressure outside the oil tank visible by setting a level gauge or pressure gauge, which facilitates monitoring and adjustment;

[0020] 6. This application enables the system to automatically or manually control the start and stop of the oil pump by setting a controller or alarm, and to issue an alarm signal when the oil pressure is abnormal, thereby improving the intelligence and safety of the system.

[0021] 7. This application simplifies the system structure, makes the layout reasonable, and facilitates installation and maintenance by setting up a symmetrical distribution of commonly used and spare pipelines.

[0022] 8. This application is applicable to any large-scale unit that requires a lubrication system, such as compressors, pumps, generators and other equipment in industries such as petroleum refining, chemical industry and power generation, and has broad application prospects and economic benefits. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the oil pump interlocking start-up anti-delay system for a generator unit lubrication oil system according to this utility model. Wherein, 1-oil tank, 21-normal inlet filter, 22-standby inlet filter, 31-normal oil pump, 32-standby oil pump, 41-normal check valve, 42-standby check valve, 51-normal safety valve, 52-standby safety valve, 61-normal shut-off valve, 62-standby shut-off valve, 7-external pipeline. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0025] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention.

[0026] like Figure 1As shown, a unit lubrication oil system pump interlock start-up anti-delay system is provided. Four pipes are connected to one side of the oil tank 1. Two pipes are connected to a normal inlet filter 21 and a standby inlet filter 22, respectively. The other two pipes are connected to a normal safety valve 51 and a standby safety valve 52, respectively. The normal inlet filter 21 and the normal safety valve 51 are connected to a normal oil pump 31 via pipes. The standby inlet filter 22 and the standby safety valve 52 are connected to a standby oil pump 32 via pipes. The normal oil pump 31 is connected to a normal check valve 41 via pipes. The normal check valve 41 is connected to a normal shut-off valve 61. The standby oil pump 32 is connected to a standby check valve 42 via pipes. The standby check valve 42 is connected to a standby shut-off valve 62. The normal shut-off valve 61 and the standby shut-off valve 62 are connected to an external pipe 7. A small hole is opened in the center of the valve plate of the standby check valve 42.

[0027] The advantage of this implementation method is that it effectively solves the problem of unstable oil pressure or safety valve activation caused by excessively low oil temperature or excessively high oil pressure when the standby oil pump 32 starts, ensuring the normal operation of the lubrication system. The specific implementation process is as follows:

[0028] When the main oil pump 31 is operating normally, the main check valve 41 is open and the standby check valve 42 is closed. The main oil pump 31 delivers the lubricating oil in the oil tank 1 to the external pipeline 7 through the main oil pump 31, the main check valve 41, and the main shut-off valve 61, thereby injecting oil into the lubrication points of the unit. At this time, the standby oil pump 32 is in a stopped state, and a small amount of lubricating oil will flow out from the small orifice of the standby check valve 42 to maintain the oil temperature and pressure in the standby oil pump 32 and the standby pipeline, and to avoid the oil temperature being too low or the oil pressure being too high.

[0029] When the primary oil pump 31 malfunctions or the oil pressure falls below the set value, the standby oil pump 32 automatically starts, the standby check valve 42 opens, and the primary check valve 41 closes. The standby oil pump 32 delivers the lubricating oil in the oil tank 1 to the external pipeline 7 through the standby oil pump 32 and the standby shut-off valve 62, thereby injecting oil into each lubrication point of the unit. At this time, the primary oil pump 31 is in a stopped state, and the primary check valve 41 may also have a small orifice open, allowing a small amount of lubricating oil to flow out, maintaining the oil temperature and pressure in the primary oil pump 31 and the primary pipeline, and preventing the oil temperature from being too low or the oil pressure from being too high.

[0030] When the standby oil pump 32 starts, the oil pressure surge will be reduced due to the presence of the small orifice of the standby check valve 42, making it less likely to cause the safety valve to open. At the same time, the oil pressure can reach the required level within the specified time, avoiding the risk of unit shutdown due to lubricating oil pressure interlock.

[0031] When the liquid level in oil tank 1 is higher than the liquid level set by the safety valve, the safety valve will automatically open to discharge excess lubricating oil, ensuring that the liquid level and pressure in oil tank 1 are stable.

[0032] As a specific example, the diameter of the pinhole is 1-3 mm.

[0033] The advantage of this embodiment is that by setting a suitable orifice diameter, the fluidity of the lubricating oil and the stability of the oil pressure can be ensured, while also reducing lubricating oil loss and waste. The specific implementation process is as follows:

[0034] Based on the properties of the lubricating oil and the ambient temperature, a suitable orifice diameter is selected to create a pressure differential within the orifice of the one-way valve, thus enabling the lubricating oil to flow in minute quantities. If the orifice diameter is too large, the lubricating oil's flowability increases, but the oil pressure decreases, potentially leading to insufficient lubrication or the safety valve tripping. Conversely, if the orifice diameter is too small, the lubricating oil's flowability decreases, but the oil pressure increases, potentially leading to excessive lubrication or the safety valve tripping. Therefore, through experimentation and calculation, an orifice diameter of 1-3 mm was determined to achieve the optimal effect.

[0035] As a specific example, the commonly used oil pump 31 and the standby oil pump 32 are centrifugal pumps or gear pumps.

[0036] The advantage of this implementation method is that it allows for the selection of a suitable oil pump type based on the properties and flow requirements of different lubricating oils, thereby improving the efficiency and reliability of the lubrication system. The specific implementation process is as follows:

[0037] Based on the viscosity and flow rate of the lubricating oil, select the appropriate oil pump type to ensure efficient delivery of the lubricating oil to the external pipeline 7. When the lubricating oil viscosity is low and the flow rate is high, a centrifugal pump can be selected, using centrifugal force to push the lubricating oil out; when the lubricating oil viscosity is high and the flow rate is low, a gear pump can be selected, using gear meshing to squeeze out the lubricating oil. By selecting the appropriate oil pump type, the delivery efficiency and stability of the lubricating oil can be guaranteed, and blockage or damage to the oil pump can be avoided.

[0038] As a specific example, the commonly used safety valve 51 and the standby safety valve 52 are spring-loaded safety valves or counterweight safety valves.

[0039] The advantage of this embodiment is that it allows for the selection of a suitable safety valve type based on different pressures and liquid levels in the oil tank 1, ensuring the safety and stability of the oil tank 1. The specific implementation process is as follows:

[0040] Based on the pressure and liquid level of oil tank 1, a suitable type of safety valve is selected so that the commonly used safety valve 51 and the standby safety valve 52 can automatically open when the pressure or liquid level in oil tank 1 exceeds the set value, discharging excess lubricating oil and preventing oil tank 1 from exploding or leaking. When the pressure in oil tank 1 is high and the liquid level is low, a spring-loaded safety valve can be selected, using the spring force to push open the valve and release the pressure; when the pressure in oil tank 1 is low and the liquid level is high, a counterweight safety valve can be selected, using the weight of the counterweight to press down the valve and prevent leakage when the liquid level is too high. By selecting the appropriate type of safety valve, the safety and stability of oil tank 1 can be guaranteed.

[0041] As a specific example, the commonly used check valve 41 and the standby shut-off valve 62 are interlocked electrically connected, and the standby check valve 42 and the commonly used shut-off valve 61 are interlocked electrically connected.

[0042] The advantage of this implementation method is that it enables automatic control of the oil pump and shut-off valve, avoiding human error or delays and improving the reliability and safety of the lubrication system. The specific implementation process is as follows:

[0043] When the main oil pump 31 is operating normally, the on / off signal of the main check valve 41 is open, the on / off signals of the standby check valve 42 and the standby shut-off valve 62 are closed, and the start / stop signal of the standby oil pump 32 is off. When the main oil pump 31 malfunctions or the oil pressure is lower than the set value, the on / off signal of the main check valve 41 is closed, the on / off signals of the standby check valve 42 and the standby shut-off valve 62 are open, and the start / stop signal of the standby oil pump 32 is on. The reverse is also true. This signal interlocking ensures the synchronous switching of the oil pump and the shut-off valve, preventing the oil pump from running dry or the shut-off valve from failing to open, thus ensuring the normal operation of the lubrication system.

[0044] As a specific example, the commonly used check valve 41 and the standby check valve 42 are ball check valves or baffle check valves.

[0045] The advantage of this implementation method is that it allows for the selection of a suitable one-way valve type based on different flow directions and flow rates of the lubricating oil, ensuring unidirectional flow and flow control of the lubricating oil. The specific implementation process is as follows:

[0046] Selecting the appropriate check valve type based on the flow direction and flow rate of the lubricating oil ensures its effective prevention of backflow or leakage. When the flow direction of the lubricating oil is complex and the flow rate is low, a ball-type check valve can be selected, utilizing the seal between the ball-shaped valve core and the valve seat to achieve unidirectional flow of the lubricating oil. When the flow direction of the lubricating oil is relatively simple and the flow rate is high, a baffle-type check valve can be selected, utilizing the opening and closing of the baffle to achieve unidirectional flow of the lubricating oil. By selecting the appropriate check valve type, unidirectional flow and flow control of the lubricating oil can be guaranteed, preventing backflow or leakage.

[0047] As a preferred example, the oil tank 1 is equipped with a heating device or a heat preservation device.

[0048] The advantage of this embodiment is that it can adjust the temperature of the lubricating oil in oil tank 1 according to different ambient temperatures, ensuring the fluidity and viscosity of the lubricating oil. The specific implementation process is as follows:

[0049] Depending on the ambient temperature, a suitable heating or insulation device is selected to maintain the lubricating oil in tank 1 within a suitable temperature range. When the ambient temperature is too low, a heating device can be selected to heat the lubricating oil in tank 1 using electric heating, steam, hot water, etc., to increase the lubricating oil temperature, reduce its viscosity, and enhance its fluidity. When the ambient temperature is too high, an insulation device can be selected to keep the lubricating oil in tank 1 warm using heat insulation, heat dissipation, cooling, etc., to lower its temperature, increase its viscosity, and reduce lubricating oil loss. By selecting a suitable heating or insulation device, the temperature of the lubricating oil in tank 1 can be guaranteed, ensuring its fluidity and viscosity.

[0050] As a preferred example, the oil tank 1 is equipped with a level gauge or pressure gauge.

[0051] The advantage of this embodiment is that it can monitor the level and pressure of the lubricating oil in tank 1 in real time, ensuring the normal operation and safety of tank 1. The specific implementation process is as follows:

[0052] A level gauge or pressure gauge is installed on the outside of oil tank 1 to display the real-time level and pressure of the lubricating oil inside, facilitating observation and adjustment by operators. When the level gauge or pressure gauge indicates that the lubricating oil level or pressure in oil tank 1 exceeds or falls below the set value, corresponding measures can be taken promptly, such as increasing or decreasing the supply of lubricating oil, adjusting the operating speed of the oil pump, or starting or closing the safety valve, to ensure the normal operation and safety of oil tank 1. By installing a level gauge or pressure gauge, the level and pressure of the lubricating oil in oil tank 1 can be monitored in real time, ensuring the normal operation and safety of oil tank 1.

[0053] As a preferred example, the system is equipped with a controller or alarm.

[0054] The advantage of this implementation method is that it enables automatic control and fault alarm for oil tank 1, improving the intelligence and safety of the lubrication system. The specific implementation process is as follows:

[0055] The system is equipped with a controller or alarm to automatically control the start and stop of the oil pump and shut-off valve, the opening and closing of the safety valve, and the switching on and off of the heating or insulation devices based on the lubricating oil level and pressure in oil tank 1, ensuring the normal operation of the lubrication system. Simultaneously, when a system malfunction or abnormality occurs, such as damage to the oil pump, leakage of the shut-off valve, activation of the safety valve, or lubricating oil leakage, the controller or alarm can promptly issue an alarm signal, prompting operators to inspect and handle the situation, preventing accidents. By installing the controller or alarm, automatic control and fault alarm functions for oil tank 1 can be achieved, ensuring the intelligence and safety of the lubrication system.

[0056] As a specific example, the commonly used inlet filter 21, commonly used safety valve 51, commonly used oil pump 31, commonly used check valve 41 and commonly used shut-off valve 61 are commonly used pipelines, while the spare inlet filter 22, spare safety valve 52, spare oil pump 32, spare check valve 42 and spare shut-off valve 62 are spare pipelines. The commonly used pipelines and spare pipelines are symmetrically distributed.

[0057] The advantage of this implementation method is that it enables dual-path oil supply to oil tank 1, improving the redundancy and reliability of the lubrication system. The specific implementation process is as follows:

[0058] On one side of oil tank 1, two symmetrically distributed pipelines are installed: a primary pipeline and a backup pipeline. Each pipeline includes an inlet filter, an oil pump, a safety valve, a check valve, and a shut-off valve. The primary and backup pipelines are connected by an external pipeline 7 to supply oil to various lubrication points of the unit. This dual-line oil supply method ensures that if either pipeline fails or malfunctions, the other pipeline can take over in time, guaranteeing the continuous operation of the lubrication system and avoiding the risk of unit shutdown due to lubricating oil pressure interlock.

[0059] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A system for preventing delayed start-up of oil pumps in a generator unit's lubrication system, characterized in that, The system includes an oil tank (1), on one side of which are connected four pipes. Two of the pipes are connected to a common inlet filter (21) and a spare inlet filter (22), respectively. The other two pipes are connected to a common safety valve (51) and a spare safety valve (52), respectively. The common inlet filter (21) and the common safety valve (51) are connected to a common oil pump (31) through pipes. The spare inlet filter (22) and the spare safety valve (52) are connected to a spare oil pump (32) through pipes. The common oil pump (31) is connected to a common check valve (41) through pipes. The common check valve (41) is connected to a common shut-off valve (61). The spare oil pump (32) is connected to a spare check valve (42) through pipes. The spare check valve (42) is connected to a spare shut-off valve (62). The common shut-off valve (61) and the spare shut-off valve (62) are connected to an external pipe (7). The valve plate of the common check valve (41) has a small hole in the center.

2. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The diameter of the small hole is 1-3 mm.

3. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The commonly used oil pump (31) and the standby oil pump (32) are centrifugal pumps or gear pumps.

4. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The commonly used safety valve (51) and the standby safety valve (52) are spring-loaded safety valves or counterweight safety valves.

5. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The commonly used check valve (41) and the standby shut-off valve (62) are interlocked and electrically connected.

6. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The commonly used check valve (41) and the spare check valve (42) are ball check valves or baffle check valves.

7. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The oil tank (1) is equipped with a heating device or a heat preservation device.

8. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The oil tank (1) is equipped with a level gauge or pressure gauge.

9. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The system is equipped with a controller or an alarm.

10. The unit lubrication oil system oil pump interlock start-up anti-delay system according to claim 1, characterized in that, The commonly used inlet filter (21), the commonly used safety valve (51), the commonly used oil pump (31), the commonly used check valve (41), and the commonly used shut-off valve (61) are commonly used pipelines. The spare inlet filter (22), the spare safety valve (52), the spare oil pump (32), the spare check valve (42), and the spare shut-off valve (62) are spare pipelines. The commonly used pipelines and the spare pipelines are symmetrically distributed.

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