External oil connecting system of equipment
By designing an external oil supply system for the equipment, the problem of insufficient lubricating oil supply when the mechanical oil pump fails is solved, the redundancy and reliability of the equipment are improved, equipment damage and downtime are avoided, and economic value is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN NINGDE NUCLEAR POWER
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-26
AI Technical Summary
In the operation of nuclear power plant equipment, when the mechanical oil pump fails, the main equipment oil system is left with only the electric oil pump supplying oil, resulting in insufficient lubrication and potentially causing equipment damage.
Design an external oil supply system for the equipment, including an oil tank, control cabinet, electric oil pump, inlet and outlet isolation valves, flanges and pressure probes. The control cabinet controls the motor to start in automatic or manual mode to ensure the reliability of lubricating oil supply.
In the event of a mechanical oil pump failure, additional lubricating oil supply is provided to prevent equipment downtime or degradation, thereby improving equipment reliability and redundancy and reducing economic costs.
Smart Images
Figure CN224284199U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of redundancy technology for nuclear power oil systems, and in particular to an external oil connection system for equipment. Background Technology
[0002] During the operation of a nuclear power plant, various large pieces of equipment need to be coordinated, such as main pumps, main feedwater pumps, turbines, and conventional island circulating water pumps. These large pieces of equipment each have their own oil systems. The purpose of these oil systems is to provide lubrication to the main equipment using mechanical oil pumps under normal operating conditions, and electric oil pumps during start-up and shutdown. These oil systems are the lifeblood of the equipment; no errors can occur during operation or start-up and shutdown. Therefore, in normal operating conditions, if a mechanical oil pump fails, an electric oil pump serves as a backup. If an electric oil pump fails, it can be isolated for online maintenance while the mechanical oil pump is running. However, there is a design flaw here. When a mechanical oil pump fails, and the electric oil pump is running, if the unit has no shutdown or power reduction window, the electric oil pump must continue to run. If this is compounded by an electric oil pump failure, the main equipment will lose lubrication because both the mechanical and electric oil pumps are unavailable. Immediately shutting down the main equipment will also lead to damage due to insufficient lubrication. For example, the electric oil pump in the gearbox lubrication system (CGR) of Unit 4 of a certain nuclear power plant experienced frequent start-ups and shutdowns. If the inlet oil pipe of the mechanical oil pump is found to be at room temperature (normal temperature is about 50-55℃), it indicates a malfunction in the mechanical oil pump, with no lubricating oil flowing through its oil pipe. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an external oil supply system for equipment, which addresses the aforementioned defect that when the mechanical oil pump of the main equipment oil system fails, the main equipment oil system is left with only an electric oil pump for oil supply and loses redundant equipment.
[0004] The technical solution adopted by this utility model to solve its technical problem is: an external oil connection system for equipment, including an oil tank, and the external oil connection system for equipment also includes a control cabinet, an electric oil pump including a motor and a pump body, an inlet isolation valve, an outlet isolation valve, and a first flange;
[0005] The motor is connected to the control cabinet and is used to drive the pump to transport the lubricating oil stored in the oil tank;
[0006] The outlet isolation valve is located between the oil tank outlet and the electric oil pump; the inlet isolation valve is located between the first flange and the electric oil pump; the other end of the first flange is used to connect to the dual filter of the nuclear power plant site crude oil system, which is used to provide lubricating oil to the main equipment.
[0007] The control cabinet is also connected to a first pressure probe installed on the main equipment via a signal line. The first pressure probe has a first set value and triggers the generation of a first switching quantity when it is determined that the measured first actual oil pressure does not exceed the first set value. The control cabinet is used to generate a motor start control signal when it receives the first switching quantity via the signal line in automatic control mode, and outputs the motor start control signal to the motor.
[0008] Furthermore, in the external oil connection system of the equipment described in this utility model, the control cabinet is also connected to the second pressure probe and the third pressure probe respectively via signal lines. The first pressure probe, the second pressure probe, and the third pressure probe detect the same position. The second pressure probe is provided with a second set value, and triggers the generation of a second switching quantity when it is determined that the measured second actual oil pressure does not exceed the second set value. The third pressure probe is provided with a third set value, and triggers the generation of a third switching quantity when it is determined that the measured third actual oil pressure does not exceed the third set value.
[0009] The control cabinet is used to generate the motor start control signal when it receives the first switch quantity and the second switch quantity in automatic control mode; or, to generate the motor start control signal when it receives the first switch quantity and the third switch quantity in automatic control mode.
[0010] Furthermore, in the external oil connection system of the equipment described in this utility model, the control cabinet includes a cabinet body and a control circuit installed inside the cabinet body. The control circuit includes a mode switching switch, a first instantaneous relay, a second instantaneous relay, a first time-delay relay, a second time-delay relay, and a contactor.
[0011] The first selection terminal of the mode switching switch is connected to the first instantaneous relay, the contactor is connected between the first instantaneous relay and the motor, the second selection terminal of the mode switching switch is connected to the second instantaneous relay, a pair of normally open contacts of the first time-delay relay are respectively connected to the second instantaneous relay and the contactor, and the second time-delay relay is connected between the first time-delay relay and the first instantaneous relay;
[0012] When the common terminal of the mode switching switch and the first selection terminal are in physical contact to form a conductive circuit, it is in manual control mode. The first instantaneous relay is energized, the contactor is energized, and the motor starts running.
[0013] When the common terminal of the mode switching switch and the second selection terminal are in physical contact to form a conductive circuit, it is in automatic control mode. If the first switch quantity is triggered, the second instantaneous relay is energized. When the first preset time is reached, the normally open contact of the first time delay relay closes, the contactor and the second time delay relay are energized, and the motor starts running. When the second preset time is reached, the second time delay relay is de-energized, the first instantaneous relay is de-energized, the contactor is de-energized, and the motor stops running.
[0014] Furthermore, in the external oil connection system of the device described in this utility model, the control circuit is also connected to the second pressure probe and the third pressure probe respectively via signal lines. The first pressure probe, the second pressure probe, and the third pressure probe detect the same position. The second pressure probe is provided with a second set value, and triggers the generation of a second switching quantity when it is determined that the measured second actual oil pressure does not exceed the second set value. The third pressure probe is provided with a third set value, and triggers the generation of a third switching quantity when it is determined that the measured third actual oil pressure does not exceed the third set value.
[0015] When the common terminal of the mode switching switch and the second selection terminal are in physical contact to form a conductive circuit, it is in automatic control mode. If both the first and second switching quantities are triggered, or both the first and third switching quantities are triggered, the second instantaneous relay is energized. When the first preset time is reached, the normally open contact of the first delay relay closes, and the relay and the second delay relay are energized, and the motor starts running.
[0016] Furthermore, in the external oil connection system of the equipment described in this utility model, the control circuit also includes a circuit breaker and a thermal relay. The circuit breaker, the contactor, and the thermal relay are connected in series between the power supply and the motor. The common terminal of the mode switching switch is connected to a pair of normally closed contacts of the thermal relay.
[0017] Furthermore, in the external oil connection system of the equipment described in this utility model, the power supply is a three-phase power supply, and each phase of the three-phase power supply is connected to the motor through the circuit breaker, the contactor and the thermal relay connected in series.
[0018] Furthermore, in the external oil connection system of the present invention, the external oil connection system also includes a second flange, and a first check valve and a second check valve connected to each other through the second flange, wherein the first check valve and the second check valve are connected between the electric oil pump and the inlet isolation valve.
[0019] Furthermore, in the external oil connection system of the equipment described in this utility model, the first check valve and the second check valve are check valves from different manufacturers and of different models to avoid common mode failure.
[0020] Furthermore, in the external oil connection system of the equipment described in this utility model, the inlet isolation valve and the outlet isolation valve are manual ball valves.
[0021] Furthermore, in the external oil connection system of the equipment described in this utility model, the other end of the first flange is used to connect to the inlet obtained by the dual filter through the online opening, so that the lubricating oil in the oil tank flows into the dual filter through the inlet through the pipeline for filtration and to form an oil circuit, and finally enters the lubrication part of the main equipment.
[0022] The external oil supply system of this utility model has the following beneficial effects: When the original oil system of the equipment is unavailable, an external oil supply system is added online, solving the problem of the main equipment oil system losing redundancy when the mechanical oil pump fails, leaving only the electric oil pump for oil supply. It enables power plant equipment to be upgraded in reliability without power reduction or shutdown when it is downgraded, bringing significant positive feedback and economic value to power plant operation. Attached Figure Description
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0024] Figure 1 This is a schematic diagram of the structure of the first embodiment of the external oil connection system of this utility model;
[0025] Figure 2 This is a schematic diagram of the control circuit of the second embodiment of the external oil connection system of this utility model;
[0026] Figure 3 This is a schematic diagram of the external oil connection system of some embodiments of the present invention;
[0027] Figure 4 This is a schematic diagram of the control circuit of the third embodiment of the external oil connection system of this utility model.
[0028] Explanation of reference numerals in the attached figures:
[0029] 1. Oil tank; 2. Control cabinet; 3. Electric oil pump; 4. Outlet isolation valve; 5. Inlet isolation valve; 6. First flange; 7. First check valve; 8. Second flange; 9. Second check valve; 21. Control circuit; 31. Motor; 211. Mode switching switch; 001UJ. Contactor; 001XR. First instantaneous relay; 002XR. Second instantaneous relay; 001XT. First time-delay relay; 002XT. Second time-delay relay. Detailed Implementation
[0030] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.
[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0032] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0033] like Figure 1As shown, in the first embodiment of the external oil supply system of this utility model, the external oil supply system includes an oil tank 1 (i.e., a spare oil tank 1). The external oil supply system also includes a control cabinet 2, an electric oil pump 3 including a motor 31 and a pump body, an inlet isolation valve 5, an outlet isolation valve 4, and a first flange 6. The outlet isolation valve 4 is located between the outlet of the oil tank 1 and the electric oil pump 3. The inlet isolation valve 5 is located between the first flange 6 and the electric oil pump 3. The other end of the first flange 6 is used to connect to the dual filter of the nuclear power plant site crude oil system (i.e., the main equipment oil system), which provides lubricating oil to the main equipment.
[0034] Motor 31 is connected to control cabinet 2 and is used to drive the pump to transport the lubricating oil stored in oil tank 1. Control cabinet 2 is also connected to a first pressure probe installed on the main equipment via a signal line. The first pressure probe has a first set value and triggers the generation of a first switching signal when it determines that the measured first actual oil pressure does not exceed the first set value. In automatic control mode, control cabinet 2 generates a motor 31 start control signal upon receiving the first switching signal via the signal line and outputs the motor 31 start control signal to motor 31.
[0035] Specifically, the other end of the first flange 6 is used to connect to the inlet of the dual filter through an online opening, so that the lubricating oil in the tank flows into the dual filter through the pipeline for filtration and forms an oil circuit, and finally enters the lubrication part of the main equipment. It is understood that there is no reserved inlet on the crude oil system at the nuclear power plant site. Considering the matching degree of lubricating oil flow between the standby system and the main system, it can only be connected from the dual filter of the crude oil system, allowing the external oil system of this embodiment to be freely connected to the original system. The oil circuit is understood to be as follows: the lubricating oil from the crude oil system is drawn from the equipment's oil tank by a mechanical oil pump (under normal operating conditions) or an electric oil pump 3 (during accident conditions or when the main equipment starts or stops), cooled by a cooler, filtered by a filter, and then, with the addition of check valves, safety valves, etc., finally re-enters the equipment's lubrication part to achieve circulation. After the external oil system of this embodiment is connected to the crude oil system, the oil stored in the tank of the external oil system flows in from the filter, achieving the same oil circulation. It should be noted that the dual filter refers to two filters connected in parallel for filtering oil. The dual filters are designed with one filter in use and one on standby. In this embodiment of the invention, the standby filter is connected to the external oil system of the device through an online opening.
[0036] In some embodiments, the control cabinet 2 is also connected to the second and third pressure probes via signal lines, wherein the first, second, and third pressure probes detect the same position. The second pressure probe has a second set value and triggers the generation of a second switching quantity when it is determined that the measured second actual oil pressure does not exceed the second set value. The third pressure probe has a third set value and triggers the generation of a third switching quantity when it is determined that the measured third actual oil pressure does not exceed the third set value. The control cabinet 2 is used to generate a motor 31 start control signal when it receives the first and second switching quantities in automatic control mode. Alternatively, it can generate a motor 31 start control signal when it receives both the first and third switching quantities in automatic control mode. In this embodiment, the purpose of setting the second and third switching quantities is to prevent the risk of false alarm triggering by the first switching quantity. Therefore, when the first switching quantity is triggered, the external oil system will start supplying oil to the main equipment as long as either the second or third switching quantity is satisfied.
[0037] It is understood that the detection positions of the first, second, and third pressure probes on the main equipment can be determined according to specific needs, and no specific limitation is made here. Their main purpose is to detect whether the lubricating oil pressure in the main equipment is too low. The pressure probes themselves can be set to preset values. Once the preset value is triggered, the corresponding switching signal is sent to control cabinet 2 via a signal line, thereby controlling motor 31 to start. It can be understood that the switching signal received by control cabinet 2 is equivalent to a low oil pressure signal. Preferably, in a preferred embodiment, the first preset value is 2.2 bar, the second preset value is 3.1 bar, and the third preset value is 2.6 bar.
[0038] In the second embodiment of the external oil connection system of this utility model, Figure 2 A schematic diagram of the control circuit 21 in this embodiment is shown. The control cabinet 2 includes a cabinet body and a control circuit 21 disposed within the cabinet body. The control circuit 21 includes a mode switching switch 211, a first instantaneous relay, a second instantaneous relay 002XR, a first time-delay relay 001XT, a second time-delay relay 002XT, and a contactor 001UJ. The first selection terminal of the mode switching switch 211 is connected to the first instantaneous relay. The contactor 001UJ is connected between the first instantaneous relay and the motor 31. The second selection terminal of the mode switching switch 211 is connected to the second instantaneous relay 002XR. A pair of normally open contacts of the first time-delay relay 001XT are respectively connected to the second instantaneous relay 002XR and the contactor 001UJ. The second time-delay relay 002XT is connected between the first time-delay relay 001XT and the first instantaneous relay.
[0039] When the common terminal of the mode switching switch 211 physically contacts the first selection terminal to form a conductive circuit, it is in manual control mode. The first instantaneous relay is energized, the contactor 001UJ is energized, and the motor 31 starts running. When the common terminal of the mode switching switch 211 physically contacts the second selection terminal to form a conductive circuit, it is in automatic control mode. If the first switching quantity is triggered, the second instantaneous relay 002XR is energized. When the first preset duration is reached, the normally open contact of the first delay relay 001XT closes, the contactor 001UJ and the second delay relay 002XT are energized, and the motor 31 starts running. When the second preset duration is reached, the second delay relay 002XT opens, the first instantaneous relay is de-energized, the contactor 001UJ is de-energized, and the motor 31 stops. It should be noted that the first preset duration is the first delay duration that the first delay relay 001XT can achieve, and the second preset duration is the second delay duration that the second delay relay 002XT can achieve. The delay duration is achieved by the relay itself. It should also be noted that instantaneous relays, also known as intermediate relays, are mainly used for signal transmission. Preferably, the first delay relay 001XT is the delay before system startup, and a relay with a 3-second delay time can be selected; the second delay relay 002XT is the running time of the system from startup to shutdown, and a relay with a 3-minute delay time can be selected.
[0040] In some embodiments, the control circuit 21 is also connected to the second pressure probe and the third pressure probe via signal lines, wherein the first pressure probe, the second pressure probe, and the third pressure probe detect the same position. The second pressure probe has a second set value and triggers the generation of a second switching quantity when it is determined that the measured second actual oil pressure does not exceed the second set value. The third pressure probe has a third set value and triggers the generation of a third switching quantity when it is determined that the measured third actual oil pressure does not exceed the third set value.
[0041] When the common terminal of the mode switching switch 211 and the second selection terminal physically contact to form a conductive circuit, it is in automatic control mode. If both the first and second switching quantities are triggered, or both the first and third switching quantities are triggered, the second instantaneous relay 002XR is energized. After the first preset time is reached, the normally open contact of the first time-delay relay 001XT closes, energizing the relay and the second time-delay relay 002XT, and the motor 31 starts running. After the second preset time is reached, the second time-delay relay 002XT opens, at which point the first instantaneous relay is de-energized, the contactor 001UJ is de-energized, and the motor 31 stops.
[0042] In some embodiments, reference Figure 4The control circuit 21 also includes a circuit breaker 001JA and a thermal relay 001FR. The circuit breaker 001JA, contactor 001UJ, and thermal relay 001FR are connected in series between the power supply and the motor 31. The common terminal of the mode switching switch 211 is connected to a pair of normally closed contacts of the thermal relay 001FR. Specifically, the power supply is a three-phase power supply, and each phase of the three-phase power supply is connected to the motor 31 through the circuit breaker 001JA, contactor 001UJ, and thermal relay 001FR connected in series.
[0043] In some embodiments, reference Figure 3 The external oil connection system also includes a second flange 8, and a first check valve 7 and a second check valve 9 connected to each other via the second flange 8. The first check valve 7 and the second check valve 9 are connected between the electric oil pump 3 and the inlet isolation valve 5. The first check valve 7 and the second check valve 9 are check valves of different manufacturers and models to avoid common mode failures. Optionally, the inlet isolation valve 5 and the outlet isolation valve 4 are manual ball valves. It is understood that the opening and closing of the check valves and isolation valves in this embodiment of the present invention does not require control cabinet 2. Under normal circumstances, they are in the open state, and they are in the closed state when the external oil connection system is not started.
[0044] Figure 4 A schematic diagram of the control circuit of the third embodiment of the external oil connection system of this utility model is shown. (Combined with...) Figure 4 In this embodiment, the mode switching switch ( Figure 4 When switching to manual mode (represented by 001CC), the first instantaneous relay 001XR is energized, its normally open contact closes, contactor 001UJ is energized, and the motor starts running. When the control mode switch is switched to automatic mode, if there is a low oil pressure signal (first switching quantity and at least one second and third switching quantity), the second instantaneous relay 002XR is energized, the first time-delay relay 001XT is energized, and timing begins. After 3 seconds, the normally open contact of the first time-delay relay 001XT closes, contactor 001UJ is energized, and the motor starts running; at the same time, the second time-delay relay 002XT is energized, timing begins, and after 3 minutes, the normally closed contact of the second time-delay relay 002XT opens, the first instantaneous relay 001XR is de-energized, contactor 001UJ is de-energized, and the motor stops.
[0045] In one specific embodiment, the composition and specifications of the external oil connection system of this embodiment are as follows:
[0046] (1) Fuel tank ×1: Volume approximately 1m³ 3(1) With cover plate, oil level gauge, support feet, oil dipstick, DN50 flange interface, the oil filling capacity can be continuously injected for 3 minutes to meet the gearbox coasting for 2 minutes. (2) Manual ball valve ×2: DN50 / PN16, flange connection, used as a temporary system isolation boundary. (3) Swing check valve ×2: DN50 / PN16, flange connection, it is the main system pressure boundary, with high sealing requirements. Different manufacturers and different models of valves are selected to avoid common mode failure. (4) 0.5m metal hose ×3, 1.5m metal hose ×1: DN50 / PN16, flange connection, the metal hose can be flexibly adjusted according to the actual situation on site, which is convenient for on-site layout. (5) Seals, several: D-type metal spiral wound gasket, DN50 / PN16; polytetrafluoroethylene sheet, 2mm. (6) Oil pump ×1: gear pump, flow rate 200L / min, pressure 3.6bar, voltage 380V, suction vacuum height 5m, power 4Kw, speed 1440r / min, matching motor. (7) Fasteners, several: M16×100 double-ended studs, grade 8.8; M16 nuts, grade 8.8; M16 spring washers. (8) Filter flange ×1: One end connects to the top cover of the main system's dual filter, with an exhaust plug at the high point, and a DN50 / PN16 flange interface at the other end. (9) Automatic control cabinet ×1: Enables automatic control of the temporary system operation and manual control in emergencies. It is mainly composed of a cabinet, time relay, thermal relay, circuit breaker, contactor, fuse, control unit, transformer, and ordinary relays. (10) Cables, several: Power supply to the temporary pump and introduce field pressure switch signals. (11) Brackets, several: Fix the temporary pump group and pipelines, and keep the check valve horizontal.
[0047] Related name code explanations: BC (junction box), CGR (circulating water pump gearbox lubrication system), FI (filter), LD / S (flow meter), LT (local temperature gauge), LP (local pressure gauge), MT (temperature probe), PG (solenoid pump), PS (sink), SP (pressure probe), VH (oil system valve), VD (water system valve). AL (power supply), FU (fuse), FR (thermal relay), JA (circuit breaker), SP (pressure probe switch), TU (transformer), UJ (contaminator), XR (instantaneous relay), XT (auxiliary time delay relay).
[0048] To verify the sealing performance of the backup oil system, a hydrostatic test was conducted on the check valve and the temporary system (small assembly). The pressure test proved its sealing ability. The pressure test procedure is as follows:
[0049] (1) Install a sealing gasket on the outlet of each check valve and connect it to the test bench. Fill with water and pressurize to 10 bar. Observe for 20 minutes. The reverse pressure leakage of the check valves is <1.5L / d, indicating good sealing. The series connection can be used as a pressure boundary (the leakage is even less when connected to the main system at a pressure of 4.8 bar and with oil medium).
[0050] (2) After the backup oil system is partially assembled, a plug is installed at the outlet and connected to the test bench. Water is injected and pressure is applied at 10 bar. Observe for 1 day. There is no visible external leakage when the backup oil system is pressurized in the forward direction.
[0051] (3) Set the start mode of the standby oil pump to automatic in the control cabinet, use a signal generator to give a simulated start signal, and use a stopwatch to time it. Start the standby oil pump offline to circulate. After 3 seconds, the standby oil pump will start automatically and run for about 3 minutes before automatically stopping. The automatic start-stop function can be implemented well.
[0052] This embodiment adds an online-connectable backup oil system to the original equipment design. When the normal redundancy of the equipment is broken and degraded, this system can be connected online without reducing power or shutting down, thus improving equipment redundancy. Furthermore, this system can serve as a backup for multiple devices and can be adjusted according to system parameters to meet the needs of multiple systems and multiple devices.
[0053] Compared to traditional mechanical oil systems, this backup oil system has the following advantages:
[0054] ① This backup oil system is independent of the on-site oil system; ② This backup oil system is external, highly flexible, and can be adjusted offline according to system requirements; ③ It increases the reliability and redundancy of the power plant's oil system; ④ It has low economic cost and high return value.
[0055] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. An external oil connection system for equipment, comprising an oil tank (1), characterized in that, The external oil connection system of the equipment also includes a control cabinet (2), an electric oil pump (3) including a motor (31) and a pump body, an inlet isolation valve (5), an outlet isolation valve (4), and a first flange (6); The motor (31) is connected to the control cabinet (2) and is used to drive the pump body to transport the lubricating oil stored in the oil tank (1); The outlet isolation valve (4) is located between the outlet of the oil tank (1) and the electric oil pump (3); the inlet isolation valve (5) is located between the first flange (6) and the electric oil pump (3); the other end of the first flange (6) is used to connect to the dual filter of the crude oil system at the nuclear power plant site, which is used to provide lubricating oil to the main equipment; The control cabinet (2) is also connected to the first pressure probe installed on the main equipment via a signal line. The first pressure probe has a first set value and triggers the generation of a first switching quantity when it is determined that the measured first actual oil pressure does not exceed the first set value. The control cabinet (2) is used to generate a motor (31) start control signal when it receives the first switching quantity via the signal line in automatic control mode, and outputs the motor (31) start control signal to the motor (31).
2. The external oil connection system for equipment according to claim 1, characterized in that, The control cabinet (2) is also connected to the second pressure probe and the third pressure probe via signal lines. The first pressure probe, the second pressure probe, and the third pressure probe detect the same position. The second pressure probe is provided with a second set value and triggers the generation of a second switch quantity when it is determined that the measured second actual oil pressure does not exceed the second set value. The third pressure probe is provided with a third set value and triggers the generation of a third switch quantity when it is determined that the measured third actual oil pressure does not exceed the third set value. The control cabinet (2) is used to generate a motor (31) start control signal when it receives the first switch quantity and the second switch quantity in automatic control mode; or, when it receives the first switch quantity and the third switch quantity in automatic control mode, it generates a motor (31) start control signal.
3. The external oil connection system for equipment according to claim 1, characterized in that, The control cabinet (2) includes a cabinet body and a control circuit (21) installed inside the cabinet body. The control circuit (21) includes a mode switching switch (211), a first instantaneous relay (001XR), a second instantaneous relay (002XR), a first time delay relay (001XT), a second time delay relay (002XT), and a contactor (001UJ). The first selection terminal of the mode switching switch (211) is connected to the first instantaneous relay (001XR), the contactor (001UJ) is connected between the first instantaneous relay (001XR) and the motor (31), the second selection terminal of the mode switching switch (211) is connected to the second instantaneous relay (002XR), a pair of normally open contacts of the first time delay relay (001XT) are respectively connected to the second instantaneous relay (002XR) and the contactor (001UJ), and the second time delay relay (002XT) is connected between the first time delay relay (001XT) and the first instantaneous relay (001XR); When the common terminal of the mode switching switch (211) and the first selection terminal are in physical contact to form a conductive circuit, it is in manual control mode. The first instantaneous relay (001XR) is energized, the contactor (001UJ) is energized, and the motor (31) starts running. When the common terminal of the mode switching switch (211) and the second selection terminal are in physical contact to form a conductive circuit, it is in automatic control mode. If the first switch quantity is triggered, the second instantaneous relay (002XR) is energized. When the first preset time is reached, the normally open contact of the first time delay relay (001XT) closes, the contactor (001UJ) and the second time delay relay (002XT) are energized, and the motor (31) starts running. When the second preset time is reached, the second time delay relay (002XT) is disconnected. At this time, the first instantaneous relay (001XR) is de-energized, the contactor (001UJ) is de-energized, and the motor (31) stops running.
4. The external oil connection system for equipment according to claim 3, characterized in that, The control circuit (21) is also connected to the second pressure probe and the third pressure probe via signal lines, wherein the first pressure probe, the second pressure probe and the third pressure probe detect the same position; the second pressure probe is provided with a second set value, and triggers the generation of a second switching quantity when it is determined that the measured second actual oil pressure does not exceed the second set value; the third pressure probe is provided with a third set value, and triggers the generation of a third switching quantity when it is determined that the measured third actual oil pressure does not exceed the third set value. When the common terminal of the mode switching switch (211) and the second selection terminal are in physical contact to form a conductive circuit, it is in automatic control mode. If both the first and second switching quantities are triggered, or both the first and third switching quantities are triggered, the second instantaneous relay (002XR) is energized. When the first preset time is reached, the normally open contact of the first time delay relay (001XT) is closed, and the relay and the second time delay relay (002XT) are energized, and the motor (31) starts running.
5. The external oil connection system for equipment according to claim 3, characterized in that, The control circuit (21) also includes a circuit breaker and a thermal relay. The circuit breaker, the contactor (001UJ) and the thermal relay are connected in series between the power supply and the motor (31). The common terminal of the mode switching switch (211) is connected to a pair of normally closed contacts of the thermal relay.
6. The external oil connection system for equipment according to claim 5, characterized in that, The power supply is a three-phase power supply, and each phase of the three-phase power supply is connected to the motor (31) through the circuit breaker, the contactor (001UJ) and the thermal relay connected in series.
7. The external oil connection system for equipment according to claim 1, characterized in that, The external oil connection system of the equipment also includes a second flange (8), and a first check valve (7) and a second check valve (9) connected to each other through the second flange (8). The first check valve (7) and the second check valve (9) are connected between the electric oil pump (3) and the inlet isolation valve (5).
8. The external oil connection system for equipment according to claim 7, characterized in that, The first check valve (7) and the second check valve (9) are different models from different manufacturers to avoid common mode failure.
9. The external oil connection system for equipment according to claim 1, characterized in that, The inlet isolation valve (5) and the outlet isolation valve (4) are manual ball valves.
10. The external oil connection system for equipment according to claim 1, characterized in that, The other end of the first flange (6) is used to connect to the inlet of the dual filter through an online opening, so that the lubricating oil in the oil tank (1) flows into the dual filter through the inlet to be filtered and form an oil circuit, and finally enters the lubrication part of the main equipment.