Fuel supply control system for engine laboratory
By designing a control system with automatic oil supply and emergency oil return functions in the engine laboratory oil supply system, the problem of fire risk in traditional systems is solved, and precise control of oil supply and safety guarantees in emergencies are achieved.
Patent Information
- Application Number
- CN202411796524.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-02-11
AI Technical Summary
The traditional engine laboratory oil supply system lacks automatic replenishment and emergency oil return functions, which leads to fire risks in the laboratory and poses huge dangers to personnel and property.
An engine laboratory fuel supply control system is designed to realize automatic oil supply using an electrical control unit, and in an emergency situation, the oil return function is activated through the emergency stop button to return fuel to the underground oil depot to avoid combustion.
It realizes the accurate and controllable oil supply in the laboratory, automatically supplies oil according to the amount of oil used, and timely controls oil return in an emergency to ensure the safety of laboratory personnel and property.
Smart Images
Figure CN119413459A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of engine experiments, and in particular to a fuel supply control system for an engine laboratory. Background Art
[0002] The engine laboratory conducts various development, calibration, emission, durability and other tests, so the fuel supply must have a safe and reliable protection system with protection functions. The traditional engine laboratory fuel supply system builds pressure through a metal oil pipe and oil pump to directly connect to the laboratory's high-level fuel tank, and then diverts it to each laboratory test bench. The laboratory has electrical and engine operating temperatures, and various unsafe electrical equipment factors, which can easily lead to a serious risk of fire caused by gasoline combustion in the laboratory.
[0003] As a laboratory for high-load engine operation, there is no fuel supply protection measure, which brings great risks to the laboratory, personnel and property. The present invention can realize automatic replenishment of the fuel supply system according to the oil level usage status through design, and can be controlled manually or automatically. In case of emergency, the oil return function can be started with one button to quickly return the fuel of the laboratory fuel supply system to the underground oil depot. In the reflux state, the fuel pipeline is in a state of oxygen deficiency and does not have the conditions for combustion, avoiding unnecessary property losses. Summary of the invention
[0004] The purpose of the present invention is to provide an engine laboratory fuel supply control system, which uses an electrical control unit to realize automatic fuel supply according to the workload status of the laboratory engine bench, and can realize the emergency stop and emergency oil return function in case of emergency.
[0005] The technical solution of the present invention is: An engine laboratory fuel supply control system, comprising: Three-phase alternating current supplies power to the oil supply motor M1 and the oil return motor M2 respectively; A switching power supply UR2, inputting the three-phase alternating current and outputting direct current; The oil level upper limit sensor B1 and the oil level lower limit sensor B2 are respectively arranged at the upper and lower parts of the laboratory oil storage tank, and the two sensors B1 and B2 are respectively powered by the DC connection; Intermediate relays KA5 and KA6 are connected to the output terminals of the upper limit oil level sensor B1 and the lower limit oil level sensor B2 respectively; a group of normally open contacts of the intermediate relays KA5 and KA6 are connected in series between the output terminal of the upper limit oil level sensor B1 and the DC output terminal of the switching power supply UR2; The oil supply contactor KM1 is powered by the DC connection, and a group of normally closed contacts of the intermediate relay KA5 and a group of normally open contacts and a group of normally closed contacts of the intermediate relay KA6 connected in parallel are also connected in series on the power supply line; the normally open contacts of the oil supply contactor KM1 are connected in series to the three-phase power supply line of the oil supply motor M1; The oil return contactor KM2 is powered by the DC power connection. The normally open contact of the oil return contactor KM2 is connected in series to the three-phase power supply line of the oil return motor M2. The normally closed contact of the oil return contactor KM2 is connected in series to the oil level upper limit sensor B1, the oil level lower limit sensor B2 and the power supply bus of the oil supply contactor KM1.
[0006] Preferably, it also includes a time delay relay KT1, which is powered by the DC connection, and a group of normally closed contacts of the time delay relay KT1 is connected in series with the oil return contactor KM2.
[0007] Preferably, it also includes an emergency stop button SB4, the normally open contact of the emergency stop button SB4 is connected in series with the oil return contactor KM2, and the normally closed contact of the emergency stop button SB4 is connected in series with the delay time relay KT1.
[0008] Preferably, it also includes a rotary switch SA1, which includes a common end, an automatic gear contact and a manual gear contact; the common end of the rotary switch SA1 is connected to the DC output end of the switching power supply UR2, the automatic gear contact is connected to a group of normally open contacts and a group of normally closed contacts connected in parallel with each other of the intermediate relay KA6; the manual gear contact is connected to the manual control component.
[0009] Preferably, the manual control component includes a start button SB2, a stop button SB3, and an intermediate relay KA7 connected in series in sequence; a group of normally open contacts of the intermediate relay KA7 is connected in parallel with the start button SB2, and one end of the other group of normally open contacts is connected to the common end of the rotary switch SA1, and the other end is connected to the normally closed contact of the intermediate relay KA5.
[0010] Preferably, it also includes an oil return solenoid valve YV1, and the oil return solenoid valve YV1 is connected in parallel with the oil return contactor KM2.
[0011] Preferably, the three-phase power supply lines of the oil supply motor M1 and the oil return motor M2 are also connected in series with overheating relays KH1 and KH2 respectively.
[0012] Preferably, the three-phase AC power is connected in series with a main power circuit breaker FQ2 on the main power supply line, and the power supply lines of the oil supply motor M1, the oil return motor M2 and the switching power supply UR2 are respectively connected in series with power circuit breakers FQ3, FQ4 and FQ5.
[0013] Preferably, the positive and negative electrodes of the output end of the switching power supply UR2 are respectively connected in series with fuses FU3 and FU4.
[0014] Preferably, a power indicator light HL5 is connected between the positive and negative electrodes of the output end of the switching power supply UR2; A group of normally closed contacts of the oil supply contactor KM1 and a stop indicator light HL8 are connected in series between the positive and negative electrodes of the output end of the switching power supply UR2; The two ends of the oil return contactor KM2 are connected in parallel with a fault indicator light HL6; A start indicator light HL7 is connected in parallel at both ends of the intermediate relay KA7.
[0015] The advantages of the present invention are: The present invention arranges an oil supply control motor and an oil return control motor in the oil supply pipeline system to realize oil supply and emergency oil return. When the oil level is lower than the limit value of the oil tank, the low liquid level sensor executes the action of the oil supply motor to start oil supply. When the oil level is higher than the limit value of the high oil level sensor, the sensor executes the oil supply motor to stop. When an emergency occurs, the emergency stop button is pressed, and the emergency stop button turns on the oil return control to start the oil return motor. At the same time, the oil return solenoid valve opens to perform emergency oil return. The above control logic can realize accurate and controllable laboratory oil supply, automatic oil supply can be realized according to the amount of oil used, and timely control of oil return can be realized in an emergency to ensure the safety of laboratory personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the engine laboratory fuel supply control system of the present invention; Figure 2 It is a schematic diagram of the layout of the engine laboratory fuel supply control system of the present invention. DETAILED DESCRIPTION
[0017] like Figure 1 , 2 As shown, the engine laboratory fuel supply control system of this embodiment includes the following components.
[0018] The three-phase AC power is used to supply power to the oil supply motor M1 and the oil return motor M2 respectively; the three-phase AC power is connected in series with the main power circuit breaker FQ2 on the main power supply line, and the power supply lines of the oil supply motor M1, the oil return motor M2 and the switch power supply UR2 are connected in series with power circuit breakers FQ3, FQ4 and FQ5 respectively. The three-phase power supply lines of the oil supply motor M1 and the oil return motor M2 are also connected in series with overheating relays KH1 and KH2 respectively.
[0019] The switch power supply UR2 inputs the three-phase AC power and outputs 24V DC power; the positive and negative poles of the output end of the switch power supply UR2 are respectively connected in series with fuses FU3 and FU4. A power indicator light HL5 is connected between the positive and negative poles of the output end of the switch power supply UR2.
[0020] The oil level upper limit sensor B1 and the oil level lower limit sensor B2 are respectively arranged at the upper part and the lower part of the laboratory oil storage tank, and the two sensors B1 and B2 are respectively powered by the DC connection.
[0021] Intermediate relays KA5 and KA6 are connected to the output terminals of the oil level upper limit sensor B1 and the oil level lower limit sensor B2 respectively; a group of normally open contacts of intermediate relays KA5 and KA6 are connected in series between the output terminal of the upper limit sensor B1 and the DC output terminal of the switching power supply UR2.
[0022] The oil supply contactor KM1 is powered by the DC power connection, and a group of normally closed contacts of the intermediate relay KA5, and a group of normally open contacts and a group of normally closed contacts of the intermediate relay KA6 connected in parallel are also connected in series on the power supply line; the normally open contacts of the oil supply contactor KM1 are connected in series to the three-phase power supply line of the oil supply motor M1; a group of normally closed contacts of the oil supply contactor KM1 and a stop indicator light HL8 are connected in series between the positive and negative poles of the output end of the switching power supply UR2.
[0023] The oil return contactor KM2 is powered by the DC connection. The normally open contact of the oil return contactor KM2 is connected in series to the three-phase power supply line of the oil return motor M2. The normally closed contact of the oil return contactor KM2 is connected in series to the upper limit oil level sensor B1, the lower limit oil level sensor B2 and the power supply bus of the oil supply contactor KM1. A fault indicator light HL6 is connected in parallel at both ends of the oil return contactor KM2.
[0024] The oil return solenoid valve YV1 is connected in parallel with the oil return contactor KM2.
[0025] The time delay relay KT1 is powered by the DC connection, and a group of normally closed contacts of the time delay relay KT1 is connected in series with the oil return contactor KM2.
[0026] Emergency stop button SB4, the normally open contact of the emergency stop button SB4 is connected in series with the oil return contactor KM2, and the normally closed contact of the emergency stop button SB4 is connected in series with the delay time relay KT1.
[0027] The rotary switch SA1 includes a common terminal, an automatic gear contact and a manual gear contact; the common terminal of the rotary switch SA1 is connected to the DC output terminal of the switch power supply UR2, the automatic gear contact is connected to a group of normally open contacts and a group of normally closed contacts connected in parallel to the intermediate relay KA6; the manual gear contact is connected to a manual control component. The manual control component includes a start button SB2, a stop button SB3, and an intermediate relay KA7 connected in series in sequence; a group of normally open contacts of the intermediate relay KA7 is connected in parallel with the start button SB2, and one end of the other group of normally open contacts is connected to the common terminal of the rotary switch SA1, and the other end is connected to the normally closed contact of the intermediate relay KA5. A start indicator light HL7 is connected in parallel to both ends of the intermediate relay KA7.
[0028] Close the main power circuit breaker FQ2 to supply power to the entire circuit. Circuit breakers FQ3 and FQ4 are motor power switches, and circuit breaker FQ5 is the control power switch. After the switch power supply UR2 is powered on, it provides 24V power to the control circuit. FU3 and FU4 are control circuit fuses. When the entire control circuit is powered on, the power indicator HL5 is always on. When the oil supply contactor KM1 is powered on, its normally closed contact is disconnected, causing the stop indicator HL8 to lose power and go out. When KM1 loses power, its normally closed contact resumes conduction and HL8 is powered on and lights up.
[0029] When the switch SA1 is turned to the automatic position, and the oil level lower limit sensor B2 senses the presence of oil, the output voltage is given to the lower limit relay KA6, so that its normally open contact is closed. When the upper limit sensor B1 does not sense the oil, the upper limit relay KA5 does not act, and its normally closed contact is in a closed state. At this time, the oil supply contactor is attracted to supply power to the oil supply motor M1 through the thermal relay KH1, so that it pumps oil into the oil tank. When the oil level reaches the upper limit sensor B1, the sensor B1 is turned on to attract the upper limit relay KA5. The normally open contact of KA5 is closed and self-locked, and the normally closed contact is disconnected, causing KM1 to be powered off and the oil supply motor to stop. When the oil level drops below the lower limit sensor B2, the lower limit sensor KA6 loses power, its normally closed contact resumes closing, the normally open contact is disconnected and KA5 is disconnected and self-locked at the same time. At this time, because KA6 and KA6's normally closed contacts are connected, KM1 is turned on again to energize the oil supply motor. Start to supply oil to the oil tank in this reciprocating cycle.
[0030] When the SA1 switch is turned to the manual position, it will automatically fail. Press the manual start button SB2 to close the manual start relay KA7, and its normally open contact will close to form a self-locking state. At the same time, another normally open contact will connect KM1, and the start indicator HL7 will light up. At this time, if the oil level reaches the upper limit sensor B1, KA5 will be connected to make KM1 lose power and stop the oil supply motor. If it does not reach the upper limit sensor B1, KM1 will be turned on to make the oil supply motor supply oil until it reaches the upper limit sensor B1. Press the manual stop button SB3 to make KA7 lose power and its normally open and normally closed contacts will return to the initial state, and HL7 will also go out.
[0031] When the emergency stop button SB4 is pressed, its normally closed contact is disconnected, causing the delay time relay KT1 to lose power and start timing for 30 minutes. At the same time, its normally open contact connects the oil return contactor KM2, and the oil return solenoid valve YV1 lights up the fault indicator HL6. When the time relay timing time is up, its delayed disconnection contact KT1 is disconnected, causing KM2, YV1, and HL6 to lose power. When the emergency stop button is reset, its normally closed contact resumes conduction, and KT1 is energized to reset and wait for the next power-off action.
[0032] The above control logic can realize accurate and controllable oil supply in the laboratory, realize automatic oil supply according to the amount of oil used, and realize timely control of oil return in emergency to ensure the safety of laboratory personnel and property.
[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.
Claims
1. An engine laboratory fuel supply control system, characterized in that: include: Three-phase alternating current supplies power to the oil supply motor M1 and the oil return motor M2 respectively; A switching power supply UR2, inputting the three-phase alternating current and outputting direct current; The oil level upper limit sensor B1 and the oil level lower limit sensor B2 are respectively arranged at the upper and lower parts of the laboratory oil storage tank, and the two sensors B1 and B2 are respectively powered by the DC connection; Intermediate relays KA5 and KA6 are connected to the output terminals of the upper limit oil level sensor B1 and the lower limit oil level sensor B2 respectively; a group of normally open contacts of the intermediate relays KA5 and KA6 are connected in series between the output terminal of the upper limit oil level sensor B1 and the DC output terminal of the switching power supply UR2; The oil supply contactor KM1 is powered by the DC connection, and a group of normally closed contacts of the intermediate relay KA5 and a group of normally open contacts and a group of normally closed contacts of the intermediate relay KA6 connected in parallel are also connected in series on the power supply line; the normally open contacts of the oil supply contactor KM1 are connected in series to the three-phase power supply line of the oil supply motor M1; The oil return contactor KM2 is powered by the DC power connection. The normally open contact of the oil return contactor KM2 is connected in series to the three-phase power supply line of the oil return motor M2. The normally closed contact of the oil return contactor KM2 is connected in series to the oil level upper limit sensor B1, the oil level lower limit sensor B2 and the power supply bus of the oil supply contactor KM1.
2. The engine laboratory fuel supply control system according to claim 1, characterized in that: It also includes a time delay relay KT1, which is powered by the DC connection, and a group of normally closed contacts of the time delay relay KT1 is connected in series with the oil return contactor KM2.
3. The engine laboratory fuel supply control system according to claim 2, characterized in that: It also includes an emergency stop button SB4, a normally open contact of the emergency stop button SB4 is connected in series with the oil return contactor KM2, and a normally closed contact of the emergency stop button SB4 is connected in series with the delay time relay KT1.
4. The engine laboratory fuel supply control system according to claim 3, characterized in that: It also includes a rotary switch SA1, which includes a common end, an automatic gear contact and a manual gear contact; the common end of the rotary switch SA1 is connected to the DC output end of the switching power supply UR2, the automatic gear contact is connected to a group of normally open contacts and a group of normally closed contacts connected in parallel with each other of the intermediate relay KA6; the manual gear contact is connected to the manual control component.
5. The engine laboratory fuel supply control system according to claim 4, characterized in that: The manual control component includes a start button SB2, a stop button SB3, and an intermediate relay KA7 connected in series in sequence; a group of normally open contacts of the intermediate relay KA7 is connected in parallel with the start button SB2, and one end of another group of normally open contacts is connected to the common end of the rotary switch SA1, and the other end is connected to the normally closed contact of the intermediate relay KA5.
6. The engine laboratory fuel supply control system according to claim 1, characterized in that: It also includes an oil return solenoid valve YV1, which is connected in parallel with the oil return contactor KM2.
7. The engine laboratory fuel supply control system according to claim 1, characterized in that: The three-phase power supply lines of the oil supply motor M1 and the oil return motor M2 are respectively connected in series with overheating relays KH1 and KH2.
8. The engine laboratory fuel supply control system according to claim 1, characterized in that: The three-phase AC power is connected in series with a main power circuit breaker FQ2 on the main power supply line, and the power supply lines of the oil supply motor M1, the oil return motor M2 and the switching power supply UR2 are respectively connected in series with power circuit breakers FQ3, FQ4 and FQ5.
9. The engine laboratory fuel supply control system according to claim 1, characterized in that: The positive and negative electrodes of the output end of the switching power supply UR2 are respectively connected in series with fuses FU3 and FU4.
10. The engine laboratory fuel supply control system according to claim 5, characterized in that: A power indicator light HL5 is connected between the positive and negative electrodes of the output end of the switching power supply UR2; A group of normally closed contacts of the oil supply contactor KM1 and a stop indicator light HL8 are connected in series between the positive and negative electrodes of the output end of the switching power supply UR2; Both ends of the oil return contactor KM2 are connected in parallel with a fault indicator light HL6; A start indicator light HL7 is connected in parallel at both ends of the intermediate relay KA7.