Oil tank refueling device

Abstract

The utility model discloses an oil tank refueling device which comprises an oil pump, a liquid level switch, a stop button, a start button, a contactor, a time relay and an intermediate relay. The device has the advantages that the liquid level switch and the time relay are connected into the oil pump control loop, the refueling state of the oil tank can be judged through refueling time and liquid level detection at the same time, the dual protection function is achieved, refueling can be accurately achieved, and the oil spilling phenomenon is reduced; if the liquid level switch or the time relay is damaged, the control of the oil pump is not affected. A worker does not need to pay attention to the refueling state of the oil tank all the time, when the oil tank is full, an alarm can be automatically given, the oil pump can be automatically stopped, the probability that the oil tank is not full or overflows is greatly reduced, and manpower and material resources can be saved.

Description

Technical field:

[0001] The utility model relates to the technical field of refueling, in particular to a fuel tank refueling device. Background technology:

[0002] Diesel crusher is a common equipment in coal crushing workshop. When the crusher oil tank is empty, the equipment will stop operating. At this time, the oil tank needs to be moved to the coal crushing workshop, and the diesel in the oil tank needs to be pumped into the crusher oil tank by the oil pump. In order to monitor the liquid level of the oil tank, a liquid level gauge is usually set in the oil tank. When the set maximum liquid level is reached, the oil pump can be turned off. However, due to the staff's untimely observation or the failure of the liquid level gauge, there are often problems such as insufficient filling of the oil tank or oil overflow. In particular, oil overflow occurs from time to time, resulting in a waste of diesel and polluting the workshop environment. Utility model content:

[0003] The utility model aims to provide a fuel tank refueling device.

[0004] The utility model is implemented by the following technical scheme: a fuel tank refueling device, which includes an oil pump, a liquid level switch, a stop button, a start button, a contactor, a time relay, and an intermediate relay. The outlet of the oil pump is connected to the inlet pipeline of the oil tank. The liquid level switch is installed on the oil tank. The normally open auxiliary contact of the contactor and the normally closed contact of the intermediate relay are connected in series and then connected in parallel with the start button to form a first branch. The power-on delayed disconnection contact of the time relay and the coil of the contactor are connected in series and then connected in parallel with the coil of the time relay to form a second branch. The stop button, the first branch and the second branch are connected in series and connected to a power supply; the power-on delayed closing contact of the time relay, the contact of the liquid level switch and the normally open contact of the intermediate relay are connected in parallel to form a third branch, and the third branch is connected in series with the coil of the intermediate relay and connected to a power supply; the main contacts of the contactor are connected to the power supply circuit of the motor of the oil pump.

[0005] Furthermore, the stop button, the first branch and the refueling indicator light are connected in series and then connected to a power source.

[0006] Furthermore, the third branch is connected in series with the full-fill indicator light and then connected to the power supply.

[0007] Furthermore, it also includes a power indicator light connected to the power supply.

[0008] The advantages of the utility model are as follows: by connecting the liquid level switch and the time relay to the oil pump control circuit, the refueling status of the oil tank can be judged by the refueling time and the liquid level detection at the same time, with dual protection functions, which can accurately realize refueling and reduce the occurrence of oil overflow; if the liquid level switch or the time relay is damaged, it will not affect the control of the oil pump. The staff does not need to pay attention to the refueling status of the oil tank all the time. When the oil tank is full, it can automatically alarm and stop the oil pump, which greatly reduces the probability of underfilling or overflowing, and can save manpower and material resources. Description of the drawings:

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0010] Figure 2 This is a control circuit diagram of the utility model.

[0011] Oil pump 1, oil tank 2, liquid level switch SQ, stop button SB1, start button SB2, contactor KM, time relay KT, intermediate relay KA, refueling indicator light HL1, power indicator light HL2, full indicator light HL3, motor M. Specific implementation method:

[0012] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0013] like Figure 1 and Figure 2As shown, a fuel tank refueling device includes an oil pump 1, a liquid level switch SQ, a stop button SB1, a start button SB2, a contactor KM, a time relay KT, and an intermediate relay KA. The outlet of the oil pump 1 is connected to the inlet pipeline of the oil tank 2. The liquid level switch is installed on the oil tank 2. The normally open auxiliary contact of the contactor KM and the normally closed contact of the intermediate relay KA are connected in series and then in parallel with the start button SB2 to form a first branch. The power-on delay disconnection contact of the time relay KT and the coil of the contactor KM are connected in series and then in parallel with the coil of the time relay KT to form a second branch. The stop button SB1, the first branch and the second branch are connected in series and then connected to a power supply; the power-on delay closing contact of the time relay KT, the contact of the liquid level switch SQ and the normally open contact of the intermediate relay KA are connected in parallel to form a third branch, and the third branch is connected in series with the coil of the intermediate relay KA and then connected to the power supply; the main contact of the contactor KM is connected to the power supply line of the motor M of the oil pump 1. The stop button SB1, the first branch and the refueling indicator light HL1 are connected in series and then connected to the power supply; the third branch is connected in series with the full-fill indicator light HL3 and then connected to the power supply; it also includes a power indicator light HL2 connected to the power supply. In this embodiment, the power supply is a 24V power supply, which can be taken from the battery system of the diesel generator, which is convenient and practical; and the time of the time relay KT and the specific measurement length of the liquid level switch SQ can be set according to the time required to fill the oil tank and the corresponding liquid level.

[0014] Working principle:

[0015] When the power supply is normal, the power indicator HL2 lights up, and the refueling conditions are met;

[0016] Press the start button SB2 - the contactor KM and the time relay KT coils are energized, the main contacts of the contactor KM are closed - the motor M is energized - the oil pump starts to run and delivers oil to the fuel tank. At the same time, the time relay KT starts timing, and the refueling indicator light HL1 lights up, indicating that the oil pump starts refueling.

[0017] When the set time of time relay KT is reached, it indicates that the fuel tank is full, and the normally closed contact of the power-on delay of time relay KT is disconnected - the coil of contactor KM loses power - motor M stops running - fuel pump 1 stops refueling; at the same time, the power-on delay closing contact of time relay KT is closed - the full indicator light HL3 is energized, indicating that the fuel tank is full, the coil of intermediate relay KA is energized - the normally open contact of intermediate relay KA closes to form self-locking, and at the same time the normally closed contact of the intermediate relay disconnects the circuit of contactor KM coil and the coil circuit of time relay KT, the fuel pump stops working, and the time relay KT stops working.

[0018] Alternatively, when the liquid level of the liquid level switch SQ is reached, the normally open contact of the liquid level switch SQ closes - the coil of the intermediate relay KA is energized, disconnecting the coil circuit of the contactor KM and the coil circuit of the time relay KT, and the full filling indicator light HL3 lights up, which can also achieve the purpose of cutting off the oil pump circuit.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A fuel tank refueling device, characterized in that: It includes an oil pump, a liquid level switch, a stop button, a start button, a contactor, a time relay, and an intermediate relay. The outlet of the oil pump is connected to the inlet pipeline of the oil tank. A liquid level switch is installed on the oil tank. The normally open auxiliary contact of the contactor and the normally closed contact of the intermediate relay are connected in series and then connected in parallel with the start button to form a first branch. The power-on delayed disconnection contact of the time relay and the coil of the contactor are connected in series and then connected in parallel with the coil of the time relay to form a second branch. The stop button, the first branch, and the second branch are connected in series and connected to a power supply; the power-on delayed closing contact of the time relay, the contact of the liquid level switch, and the normally open contact of the intermediate relay are connected in parallel to form a third branch. The third branch is connected in series with the coil of the intermediate relay and then connected to a power supply; the main contacts of the contactor are connected to the power supply circuit of the motor of the oil pump.

2. A fuel tank refueling device according to claim 1, characterized in that: The stop button, the first branch and the refueling indicator light are connected in series and then connected to a power source.

3. The fuel tank refueling device according to claim 1, characterized in that: The third branch is connected in series with the full-fill indicator light and then connected to the power supply.

4. The fuel tank refueling device according to claim 1, characterized in that: It also includes a power indicator light connected to the power source.

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