Automatic refueling device and power station system

Abstract

The embodiment of the utility model provides an automatic refueling device and a power station system, and relates to the field of automatic refueling of power stations. The utility model aims to solve the problem of mechanical failure caused by non-correspondence between automatic refueling amount and actual refueling amount. In the automatic oiling device, an oil quantity sensor is connected with a control module, and the oil quantity sensor is used for detecting the real-time oil quantity in an oil tank; the liquid level switch is connected with the control module and used for detecting the real-time oil level in the oil tank. The relay is connected with the oil pump and the control module, and the control module is used for controlling the relay according to comparison of the real-time oil level and the real-time oil quantity so as to control the oil pump to carry out refueling or giving an alarm and controlling the oil pump to stop refueling. The power station system comprises the automatic oiling device. Automatic refueling is started and stopped through the liquid level switch, the oil quantity of the oil tank is doubly mastered through the oil quantity sensor, mechanical faults caused by the fact that the automatic refueling quantity does not correspond to the actual refueling quantity are avoided, and the safety of automatic refueling is improved.

Description

Technical Field

[0001] The utility model relates to the field of automatic refueling of power stations, and in particular to an automatic refueling device and a power station system. Background Art

[0002] In the use scenario of power stations, it is often necessary to use automatic refueling of the power station system. In the past, the automatic refueling device of the power station system consisted of a high and low level switch of the oil tank, a refueling pump, an automatic refueling selection switch, a contactor, a relay, etc. When the oil tank level does not reach the lower level, the oil pump starts working when the automatic refueling is turned on; when the oil tank level reaches the lower level, the lower level detection is turned off, the upper level continues to be detected, and refueling continues. When the oil tank level reaches the upper level, the oil pump stops working.

[0003] The prior art has the following disadvantages:

[0004] At present, automatic refueling is completely based on the upper and lower liquid levels of the fuel tank. The lower liquid level enters the automatic refueling mode, and the upper liquid level exits the automatic refueling mode. When the lower liquid level switch is damaged, the automatic refueling mode cannot be entered, which may cause the diesel engine to keep running until the fuel tank is empty, and the diesel engine is damaged; when the upper liquid level switch is damaged, the automatic refueling mode cannot be exited, which may cause the refueling pump to keep refueling, and the fuel tank overflows with diesel, which is a waste of diesel. Utility Model Content

[0005] The purpose of the utility model includes, for example, providing an automatic refueling device, which can improve the problem of mechanical failure caused by the mismatch between automatic refueling and actual refueling amount.

[0006] The utility model also aims to provide a power station system, which can improve the problem of mechanical failure caused by the mismatch between automatic refueling and actual refueling amount.

[0007] The embodiments of the present invention can be implemented as follows:

[0008] An embodiment of the utility model provides an automatic refueling device, comprising a control module, an oil level sensor, a liquid level switch, an oil pump and a relay, wherein the oil level sensor is used to be arranged in a fuel tank, the oil level sensor is connected to the control module, and the oil level sensor is used to detect the real-time oil level in the fuel tank; the liquid level switch is used to be arranged in the fuel tank, the liquid level switch is connected to the control module, and the liquid level switch is used to detect the real-time oil level in the fuel tank; the relay is connected to the oil pump, and the relay is connected to the control module, and the control module is used to control the relay according to the comparison between the real-time oil level and the real-time oil level, so as to control the oil pump to refuel, or to alarm and control the oil pump to stop refueling.

[0009] In addition, the automatic refueling device provided in the embodiment of the utility model may also have the following additional technical features:

[0010] Optionally, the automatic refueling device includes a power supply circuit, an upper liquid level circuit, a lower liquid level circuit and a control circuit; the control circuit is connected to the power supply circuit, the control module, the oil level sensor and the relay are connected to the control circuit, the control circuit is used to output a refueling signal, the upper liquid level circuit and the lower liquid level circuit are connected in parallel between the power supply circuit and the control circuit; the liquid level switch has an upper liquid level switch and a lower liquid level switch, the position of the upper liquid level switch is higher than the position of the lower liquid level switch, the upper liquid level switch is connected to the upper liquid level circuit, the upper liquid level switch is a normally closed contact, and the upper liquid level switch is used to disconnect when the oil level reaches the upper liquid level; the lower liquid level switch is connected to the lower liquid level circuit, the lower liquid level switch is a normally closed contact, and the lower liquid level switch is used to disconnect when the oil level reaches the lower liquid level.

[0011] Optionally, the automatic refueling device further includes an automatic refueling switch; the automatic refueling switch is arranged on the control circuit, and the automatic refueling switch is used to make the control circuit conductive when closed.

[0012] Optionally, the coil of the relay is arranged on the control circuit, and the relay has a first normally open contact and a second normally open contact, the first normally open contact is arranged on the upper liquid level circuit, the first normally open contact is used to control the refueling input signal, and the second normally open contact is arranged on the power supply circuit.

[0013] Optionally, the automatic refueling device also includes an oil pump circuit and a contactor, and the oil pump circuit is connected to the power supply circuit; the coil of the contactor is arranged on the power supply circuit, and the coil of the contactor is used to obtain power when the second normally open contact is closed to control the conduction of the oil pump circuit.

[0014] Optionally, the position of the lower liquid level switch corresponds to 15% of the liquid level in the fuel tank, and the position of the upper liquid level switch corresponds to 85% of the liquid level in the fuel tank.

[0015] Optionally, the automatic refueling device further comprises a display light, and the display light is arranged on the power supply line.

[0016] Optionally, a theoretical refueling time per unit of the oil pump corresponds to a theoretical refueling amount per unit of the oil tank.

[0017] Optionally, the control module is a PLC controller.

[0018] The embodiment of the utility model further provides a power station system. The power station system comprises a power station oil tank and an automatic refueling device, wherein the automatic refueling device is connected to the power station oil tank.

[0019] The beneficial effects of the automatic refueling device and the power station system of the embodiment of the utility model include, for example:

[0020] The automatic refueling device includes a control module, an oil level sensor, a liquid level switch, an oil pump and a relay. The oil level sensor is used to be arranged in a fuel tank, the oil level sensor is connected to the control module, and the oil level sensor is used to detect the real-time oil level in the fuel tank; the liquid level switch is used to be arranged in the fuel tank, the liquid level switch is connected to the control module, and the liquid level switch is used to detect the real-time oil level in the fuel tank; the relay is connected to the oil pump, and the relay is connected to the control module. The control module is used to control the relay according to the comparison between the real-time oil level and the real-time oil level, so as to control the oil pump to refuel, or to alarm and control the oil pump to stop refueling.

[0021] The automatic refueling device not only uses a liquid level switch to turn on and off automatic refueling, but also uses an oil level sensor to double-check the oil level in the tank to prevent one damage from causing the system to fail to operate, and to prevent mechanical malfunctions caused by mechanical idling.

[0022] The power station system, including the above-mentioned automatic refueling device, can improve the problem of mechanical failure caused by the mismatch between automatic refueling and actual refueling amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a circuit diagram of the automatic refueling device provided in this embodiment.

[0025] Icons: 10-automatic refueling device; 150-control module; 200-oil level sensor; 300-liquid level switch; 310-upper liquid level switch; 320-lower liquid level switch; 400-oil pump; 410-oil pump circuit; 500-relay; 510-contactor; 600-power supply circuit; 610-upper liquid level circuit; 620-lower liquid level circuit; 630-control circuit; 700-automatic refueling switch; 800-display light. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] Combine the following Figure 1 The automatic refueling device 10 provided in this embodiment is described in detail.

[0033] Please refer to Figure 1The embodiment of the utility model provides an automatic refueling device 10, including a control module 150, an oil level sensor 200, a liquid level switch 300, an oil pump 400 and a relay 500. The oil level sensor 200 is used to be arranged in the oil tank, and the oil level sensor 200 is connected to the control module 150. The oil level sensor 200 is used to detect the real-time oil level in the oil tank; the liquid level switch 300 is used to be arranged in the oil tank, and the liquid level switch 300 is connected to the control module 150. The liquid level switch 300 is used to detect the real-time oil level in the oil tank; the relay 500 is connected to the oil pump 400, and the relay 500 is connected to the control module 150. The control module 150 is used to control the relay 500 according to the comparison between the real-time oil level and the real-time oil level, so as to control the oil pump 400 to refuel, or alarm and control the oil pump 400 to stop refueling.

[0034] When automatic refueling starts, the liquid level switch 300 detects the oil level in the fuel tank, and the liquid level switch 300 transmits a signal to the control module 150. The control module 150 detects the real-time oil level in the fuel tank detected by the oil level sensor 200, and compares the real-time oil level with the real-time oil level. If the corresponding relationship between the real-time oil level and the real-time oil level is within a reasonable range, the control module 150 controls the oil pump 400 to refuel through the relay 500. If the corresponding relationship between the real-time oil level and the real-time oil level is not within a reasonable range, the control module 150 issues an alarm and controls the oil pump 400 to stop refueling through the relay 500.

[0035] When the oil level in the fuel tank does not reach the lower liquid level, the liquid level switch 300 transmits a signal to the control module 150. If the real-time oil level detected by the oil level sensor 200 is higher than the oil level corresponding to below the lower liquid level, the control module 150 will control the alarm and will not control refueling through the relay 500. If the liquid level switch 300 does not transmit a signal, and the oil level detected by the oil level sensor 200 corresponds to below the lower liquid level, the control module 150 will control refueling through the relay 500.

[0036] When the fuel tank is filled to the upper liquid level, assuming that the fuel level corresponding to the fuel level sensor 200 is not within the corresponding fuel level range above the upper liquid level, the control module 150 will alarm; when the fuel tank is filled with fuel and the upper liquid level switch 310 is not detected, the fuel tank is filled until the fuel level sensor 200 detects the speed of the tank, and the control module 150 will also control to stop refueling.

[0037] During the refueling process, the control module 150 will continuously detect the oil level sensor 200. When it is detected that the oil pump 400 has been working for 30 seconds and the oil level sensor 200 has increased by less than 4%, it is considered that the oil pump 400 has not refueled, and the control module 150 will stop refueling. The data of 30 seconds corresponding to 4% can be adjusted according to the actual corresponding situation of the oil pump 400 and the oil tank.

[0038] The automatic refueling device 10 not only uses the liquid level switch 300 to turn on and off automatic refueling, but also uses the oil level sensor 200 to double-control the oil level in the oil tank to avoid one damage causing the system to be unable to operate, which is of great help to the automatic refueling of the power station system.

[0039] Reference Figure 1 In this embodiment, the control module 150 is a PLC controller. The PLC controller can compare the current tank liquid level with the tank liquid level half a minute ago in real time to determine whether refueling should be stopped at this time. The PLC can be replaced by other modules with logic programming.

[0040] Reference Figure 1 In this embodiment, the automatic refueling device 10 includes a power supply circuit 600, an upper liquid level circuit 610, a lower liquid level circuit 620 and a control circuit 630; the control circuit 630 is connected to the power supply circuit 600, the control module 150, the oil level sensor 200 and the relay 500 are connected to the control circuit 630, the control circuit 630 is used to output a refueling signal, the upper liquid level circuit 610 and the lower liquid level circuit 620 are connected in parallel between the power supply circuit 600 and the control circuit 630; the liquid level switch 300 has an upper liquid level switch 310 and a lower liquid level switch 3 20. The position of the upper liquid level switch 310 is higher than that of the lower liquid level switch 320. The upper liquid level switch 310 is connected to the upper liquid level circuit 610. The upper liquid level switch 310 is a normally closed contact. The upper liquid level switch 310 is used to disconnect when the oil level reaches the upper liquid level; the lower liquid level switch 320 is connected to the lower liquid level circuit 620. The lower liquid level switch 320 is a normally closed contact. The lower liquid level switch 320 is used to disconnect when the oil level reaches the lower liquid level; the control module 150, the oil level sensor 200 and the relay 500 are connected to the control circuit 630.

[0041] The automatic refueling switch 700 is closed and the automatic refueling starts. When the liquid level in the fuel tank does not reach the lower liquid level, the lower liquid level switch 320 is a normally closed contact, the lower liquid level circuit 620 is connected, the control circuit 630 is in a conducting state, the relay 500 is energized, and the relay 500 controls the oil pump 400 to refuel; when the liquid level in the fuel tank reaches the lower liquid level, the lower liquid level switch 320 is disconnected, and the lower liquid level circuit 620 is disconnected; the upper liquid level switch 310 is a normally closed contact, the upper liquid level circuit 610 is connected, the control circuit 630 is in a conducting state, the relay 500 is energized, and the relay 500 controls the oil pump 400 to continue refueling. When the oil in the fuel tank reaches the upper liquid level switch 310, the upper liquid level switch 310 is disconnected, the upper liquid level circuit 610 is disconnected, the control circuit 630 is disconnected, the oil pump 400 stops working, and refueling can no longer be performed. Automatic refueling is achieved through the lower liquid level switch 320 of the liquid level switch 300, and automatic refueling is exited through the upper liquid level switch 310 of the liquid level switch 300.

[0042] The signals of the upper liquid level switch 310 and the lower liquid level switch 320 are transmitted to the control module 150 through the control line 630. After comparing the real-time oil level and the real-time oil quantity, the control module 150 controls the relay 500 to realize refueling or stop refueling.

[0043] Reference Figure 1 In this embodiment, the automatic refueling device 10 further includes an automatic refueling switch 700; the automatic refueling switch 700 is disposed on the control circuit 630, and the automatic refueling switch 700 is used to conduct the control circuit 630 when closed.

[0044] Figure 1 SA04_R in the figure is the automatic refueling switch 700. When the automatic refueling switch 700 is pressed and closed, the control circuit 630 is turned on, the relay 500 is energized, and the automatic refueling is started. If the automatic refueling switch 700 is not pressed, the control circuit 630 is disconnected, and the refueling control cannot be performed.

[0045] Reference Figure 1 In this embodiment, the coil of the relay 500 is arranged on the control circuit 630, and the relay 500 has a first normally open contact and a second normally open contact. The first normally open contact is arranged on the upper liquid level circuit 610, and the first normally open contact is used to control the refueling input signal. The second normally open contact is arranged on the power supply circuit 600.

[0046] Figure 1 KA04 in the figure is the coil of the relay 500, KA04_1 is the first normally open contact, and KA04_2 is the second normally open contact. After the automatic refueling switch 700 is pressed, the coil KA04 of the relay 500 is energized, the first normally open contact KA04_1 and the second normally open contact KA04_2 are closed, the upper liquid level circuit 610 is turned on, the upper liquid level switch 310 and the lower liquid level switch 320 are in the normally closed state, at this time, the upper liquid level circuit 610 and the lower liquid level circuit 620 are both in the turned-on state, the second normally open contact KA04_2 is closed, and the power supply circuit 600 is turned on.

[0047] Reference Figure 1 In this embodiment, the automatic refueling device also includes an oil pump circuit 410 and a contactor 510, and the oil pump circuit 410 is connected to the power circuit 600; the coil of the contactor 510 is arranged on the power circuit 600, and the coil of the contactor 510 is used to obtain power when the second normally open contact is closed to control the conduction of the oil pump circuit 410.

[0048] Figure 1KM05 is the coil of the contactor 510, and the coil of the contactor 510 is connected to the second normally open contact of the relay 500. When the second normally open contact is closed and the power supply line 600 is turned on, the coil of the contactor 510 is energized, the contactor 510 is closed, the oil pump line 410 is turned on, and the oil pump 400 starts to refuel.

[0049] In this embodiment, the position of the lower liquid level switch 320 corresponds to 15% of the tank liquid level, and the position of the upper liquid level switch 310 corresponds to 85% of the tank liquid level. In other embodiments, the setting positions of the lower liquid level switch 320 and the upper liquid level switch 310 can be adjusted to ensure that the lower liquid level switch 320 controls automatic refueling and the upper liquid level switch 310 controls the exit of automatic refueling.

[0050] Reference Figure 1 In this embodiment, the automatic refueling device 10 further includes a display light 800, which is arranged on the power supply line 600. When the second normally open contact KA04_2 of the relay 500 is closed, the power supply line 600 is turned on, the coil KM05 of the contactor 510 is energized, the normally open contact of the contactor 510 is closed, and the oil pump line 410 starts to refuel. At this time, the display light 800 also turns on, indicating that refueling is in progress.

[0051] In this embodiment, the theoretical refueling time per unit of the oil pump 400 corresponds to the theoretical refueling volume per unit of the oil tank. By setting the theoretical refueling time per unit to correspond to the theoretical refueling volume per unit, an alarm can be controlled or refueling can be stopped when the control module 150 detects that the oil volume does not correspond to the refueling time. For example, in this embodiment, when it is detected that the oil pump 400 has been working for 30 seconds and the increase in the oil volume sensor 200 is less than 4%, it is considered that the oil pump 400 has not refueled, and the controller will control the refueling to stop.

[0052] According to an automatic refueling device 10 provided in this embodiment, the working principle of the automatic refueling device 10 is:

[0053] Reference Figure 1 , line 100 is the positive pole of 24V, and the lower liquid level switch 320 uses a normally closed contact. When the tank level does not reach the lower level, line 131 has 24V to 00. When the automatic refueling switch 700 is closed, KA04 is energized, KA04_2 contact is connected, KA04_1 contact is connected, KM05 is energized, and the oil pump 400 starts to refuel. When the oil tank level reaches the lower level, the lower liquid level switch 320 is disconnected, line 131 has no 24V to 00, but the upper liquid level switch 310 is a normally closed contact, the upper liquid level circuit 610 is connected, KA04 continues to be energized, and refueling continues; when the tank level reaches the upper level, the lower liquid level switch 320 is disconnected, line 130 has no 24V to 00, the KA04 coil is disconnected, KM05 is not energized, and the oil pump 400 stops working.

[0054] When the oil tank does not reach the lower liquid level, the automatic refueling switch 700 works, and the 138A signal is given to the PLC. At this time, the PLC will detect the real-time oil level of the oil level sensor 200. Assuming that the real-time oil level is not between 10% and 20% at this time, the PLC program control will alarm and will not give the relay 500 coil signal through 138B, so that refueling will not be done.

[0055] When the fuel tank is filled to the upper level, assuming that the real-time fuel volume is not between 80% and 90%, the PLC program control will alarm; when the fuel tank is filled without detecting the upper level switch 310, and the fuel tank is filled to 90% of the real-time fuel volume, the PLC program control will also stop refueling.

[0056] During the refueling process, the PLC will continue to detect the tank level sensor. When it detects that the refueling pump 400 has been working for 30 seconds and the increase in the tank level sensor is less than 4%, it is considered that the refueling pump 400 has not refueled, and the PLC program control will stop refueling.

[0057] The automatic refueling device 10 provided in this embodiment has at least the following advantages:

[0058] Automatic refueling is achieved by the control module 150 and the oil level sensor 200. Even if the liquid level switch 300 is damaged, resulting in the inability to automatically start or automatically shut down the automatic refueling, the diesel engine will not continue to start and the fuel tank will not be full of oil and continue to automatically refuel, resulting in waste. Not only is the automatic refueling turned on and off by the liquid level switch 300, but the oil level sensor 200 is also added to double-control the oil level in the fuel tank, avoiding the system from being unable to operate due to one damage, which is of great help to the automatic refueling of the power station system.

[0059] During the automatic refueling process, not only a refueling signal is given to the refueling pump 400, but also whether the refueling pump 400 is actually refueling is detected. If the refueling pump 400 is not refueling, an alarm is issued to prevent the refueling pump 400 from idling all the time and avoid damage to the refueling pump 400.

[0060] The PLC can compare the current tank level with the tank level half a minute ago in real time to determine whether refueling should be stopped at this time.

[0061] The embodiment of the utility model also provides a power station system. The power station system includes a power station oil tank and an automatic refueling device 10, and the automatic refueling device 10 is connected to the power station oil tank. The automatic refueling device 10 is used to automatically refuel the power station oil tank. The problem that the automatic refueling and the actual refueling amount are not consistent and cause mechanical failure is improved.

[0062] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An automatic refueling device, characterized in that: include: A control module (150); An oil level sensor (200), the oil level sensor (200) being arranged in the oil tank, the oil level sensor (200) being connected to the control module (150), and the oil level sensor (200) being used to detect the real-time oil level in the oil tank; A liquid level switch (300), the liquid level switch (300) being arranged in the oil tank, the liquid level switch (300) being connected to the control module (150), and the liquid level switch (300) being used to detect the real-time oil level in the oil tank; An oil pump (400) and a relay (500), wherein the relay (500) is connected to the oil pump (400), and the relay (500) is connected to the control module (150), and the control module (150) is used to control the relay (500) according to a comparison between the real-time oil level and the real-time oil quantity, so as to control the oil pump (400) to refuel, or to alarm and control the oil pump (400) to stop refueling.

2. The automatic refueling device according to claim 1, characterized in that: The automatic refueling device comprises a power supply circuit (600), an upper liquid level circuit (610), a lower liquid level circuit (620) and a control circuit (630); the control circuit (630) is connected to the power supply circuit (600); the control module (150), the oil level sensor (200) and the relay (500) are connected to the control circuit (630); the control circuit (630) is used to output a refueling signal; the upper liquid level circuit (610) and the lower liquid level circuit (620) are connected in parallel between the power supply circuit (600) and the control circuit (630); The liquid level switch (300) comprises an upper liquid level switch (310) and a lower liquid level switch (320); the position of the upper liquid level switch (310) is higher than that of the lower liquid level switch (320); the upper liquid level switch (310) is connected to the upper liquid level circuit (610); the upper liquid level switch (310) is a normally closed contact; and the upper liquid level switch (310) is used to be disconnected when the oil level reaches the upper liquid level; the lower liquid level switch (320) is connected to the lower liquid level circuit (620); the lower liquid level switch (320) is a normally closed contact; and the lower liquid level switch (320) is used to be disconnected when the oil level reaches the lower liquid level.

3. The automatic refueling device according to claim 2, characterized in that: The automatic refueling device further comprises an automatic refueling switch (700); the automatic refueling switch (700) is arranged on the control circuit (630), and the automatic refueling switch (700) is used to make the control circuit (630) conductive when it is closed.

4. The automatic refueling device according to claim 3, characterized in that: The coil of the relay (500) is arranged on the control circuit (630), and the relay (500) has a first normally open contact and a second normally open contact, the first normally open contact is arranged on the upper liquid level circuit (610), the first normally open contact is used to control the refueling input signal, and the second normally open contact is arranged on the power supply circuit (600).

5. The automatic refueling device according to claim 4, characterized in that: The automatic refueling device further comprises an oil pump circuit (410) and a contactor (510), wherein the oil pump circuit (410) is connected to the power circuit (600); a coil of the contactor (510) is arranged on the power circuit (600), and the coil of the contactor (510) is used to be energized when the second normally open contact is closed, so as to control the conduction of the oil pump circuit (410).

6. The automatic refueling device according to any one of claims 2 to 5, characterized in that: The position of the lower liquid level switch (320) corresponds to 15% of the liquid level in the oil tank, and the position of the upper liquid level switch (310) corresponds to 85% of the liquid level in the oil tank.

7. The automatic refueling device according to any one of claims 2 to 5, characterized in that: The automatic refueling device further comprises a display light (800), and the display light (800) is arranged on the power supply line (600).

8. The automatic refueling device according to any one of claims 1 to 5, characterized in that: The theoretical refueling time per unit of the oil pump (400) corresponds to the theoretical refueling amount per unit of the oil tank.

9. The automatic refueling device according to any one of claims 1 to 5, characterized in that: The control module (150) is a PLC controller.

10. A power station system, characterized in that: The power station system comprises a power station oil tank and the automatic refueling device according to any one of claims 1 to 9, wherein the automatic refueling device is connected to the power station oil tank.

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