Fully automated constant pressure emergency fuel supply system and method

Abstract

The application discloses a full-automatic constant-pressure emergency oil supply system and method, and relates to the technical field of oil supply systems, in particular to an emergency oil supply system which can provide reliable emergency oil supply in the case of oil supply system failure or system power failure. The emergency oil supply system comprises a high-speed speed increaser, an oil supply system, an oil tank, a gas tank, a PLC controller and a control unit, the oil tank is connected with one end of an exhaust pipe, the oil tank, the oil supply system and the high-speed speed increaser are connected with each other through oil pipes, a pipeline pressure sensor is installed on the oil pipe between the high-speed speed increaser and the oil tank, the high-speed speed increaser and the pipeline pressure sensor are electrically connected with the PLC controller respectively, and the PLC controller is used for sending a pressure loss alarm signal to the outside; the gas tank is connected with the oil tank through a gas pipe, an always-open gas supply electromagnetic valve is arranged on the gas pipe, and the always-open gas supply electromagnetic valve is electrically connected with the PLC controller; the exhaust pipe and the gas pipe are connected with the control unit respectively, the PLC controller is electrically connected with the control unit, and the control unit is used for controlling the opening and closing of the gas pipe and the opening and closing of the exhaust pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of emergency oil supply for sliding bearing, and particularly relates to a full-automatic constant-pressure emergency oil supply system and method. BACKGROUND

[0002] In some high-speed rotating mechanical components (such as high-speed speed increasers), precise bearings (such as high-speed sliding bearings) are often used. The precise bearings need to be lubricated by good liquid oil during operation, and a special oil supply system is generally matched. However, the special oil supply system may fail during high-speed operation of the mechanical component, such as oil supply pump failure or system power failure. From the oil cut-off to the detection of the failure by the control system to stop the rotation of the mechanical component, the precise bearing is in a dry running state, which may cause bearing damage. In order to avoid dry running of the bearing, it is required that the oil supply system has the ability to detect its own failure and provide emergency oil supply, that is, an emergency oil supply system is provided for the precise bearing.

[0003] At present, there are three kinds of emergency oil supply systems.

[0004] (1) A one-way valve and an energy accumulator are arranged in an oil pipe. The energy accumulator stores energy during normal oil supply, and when the oil supply pressure in the oil pipe decreases, the potential energy of the energy accumulator is used to provide oil supply pressure and flow for a certain period of time for emergency oil supply. The system principle diagram is shown in Fig. 1-a.

[0005] (2) An oil tank and a compressed gas source are added. When the oil supply pressure in the oil pipe decreases or the oil supply system is accidentally powered off, the first electromagnetic valve and the manual stop valve are opened to connect the compressed gas pipe to the compressed gas, and the residual oil in the oil tank is sent out. The system principle diagram is shown in Fig. 1-b.

[0006] (3) The oil supply circuit is backed up and an UPS (uninterruptible power supply) is used for power supply. When the PLC controller (powered by the UPS) detects that the oil supply pressure in the oil pipe decreases, the standby oil supply circuit is started immediately to provide emergency oil supply. The system principle diagram is shown in Fig. 1-c.

[0007] Defects of the prior art:

[0008] (1) The emergency oil supply system using the energy accumulator has a simple structure and is easy to use and maintain. However, because the potential energy is used to provide the oil source, the potential energy will decrease continuously, resulting in a sharp decrease in the oil supply pressure. For some equipment that requires precise oil supply lubrication, the lubrication may fail due to the low pressure that cannot spray to the target point.

[0009] (2) The emergency oil supply system using the compressed gas source is relatively troublesome to operate. The manual stop valve needs to be opened and closed before and after use, and the emergency oil supply is triggered, which may cause excessive oil supply and cause the oil to overflow from the equipment, resulting in unnecessary oil consumption and cleaning and maintenance troubles.

[0010] (3) The emergency oil supply system with uninterrupted power supply and backup oil supply circuit can provide reliable emergency oil supply, but its structure is complex and the cost is high. SUMMARY

[0011] The application aims to provide an emergency oil supply system which is fully automatic, constant pressure, adjustable oil supply time and simple structure, and can provide reliable emergency oil supply in case of system failure or power failure.

[0012] To achieve the above-mentioned purpose, the application provides a fully automatic constant pressure emergency oil supply system,

[0013] The emergency oil supply system comprises a high-speed speed increaser, an oil supply system, an oil tank, an air tank, a PLC controller and a control unit,

[0014] The oil tank is connected with one end of the exhaust pipe, the oil tank, the oil supply system and the high-speed speed increaser are connected with each other through oil pipes, a pipeline pressure sensor is installed on the oil pipe between the high-speed speed increaser and the oil tank, the high-speed speed increaser and the pipeline pressure sensor are electrically connected with the PLC controller respectively, and the PLC controller is used for sending a pressure loss alarm signal outwardly;

[0015] The air tank is connected with the oil tank through an air pipe, a normally open air supply electromagnetic valve is arranged on the air pipe, and the normally open air supply electromagnetic valve is electrically connected with the PLC controller;

[0016] The exhaust pipe and the air pipe are connected with the control unit respectively, the PLC controller is electrically connected with the control unit, and the control unit is used for controlling the opening and closing of the air pipe and the exhaust pipe.

[0017] Further, the control unit comprises a normally open air electromagnetic valve, a normally closed cut-off electromagnetic valve and a control circuit, the normally open air electromagnetic valve is arranged on the exhaust pipe, the normally open air electromagnetic valve is used for controlling the air release of the oil tank, the normally closed cut-off electromagnetic valve is arranged on the air pipe, and the normally closed cut-off electromagnetic valve is used for controlling the air release of the air tank.

[0018] The normally open air electromagnetic valve and the normally closed cut-off electromagnetic valve are electrically connected with the control circuit, and the control circuit is used for controlling the opening and closing of the normally open air electromagnetic valve and the normally closed cut-off electromagnetic valve.

[0019] The PLC controller is electrically connected with the control circuit.

[0020] Further, the control circuit comprises a power supply, a delay disconnecting relay switch, a delay disconnecting relay, a charging resistor and a capacitor.

[0021] The charging resistor and the capacitor are connected in series, the power supply is connected in parallel with the charging resistor, the time-delay disconnecting relay switch is connected in series with the power supply and the charging resistor, and the time-delay disconnecting relay is connected in series with the power supply and the charging resistor.

[0022] The time-delay disconnecting relay is electrically connected with the PLC controller, and is used for controlling the opening and closing of the time-delay disconnecting relay switch.

[0023] Further, the power supply is a 24V power supply.

[0024] Further, the capacitor is a 24V super capacitor.

[0025] Further, a throttle valve is installed on the exhaust pipe, and the throttle valve is located at the exhaust port of the normally-opened air electromagnetic valve.

[0026] Further, a protective cover is installed at the exhaust pipe port.

[0027] The application also provides a full-automatic constant-pressure emergency oil supply method,

[0028] When working normally:

[0029] The normally-closed cut-off electromagnetic valve is opened by electricity, the normally-opened air electromagnetic valve is closed by electricity, the PLC controller controls the normally-opened air electromagnetic valve to be closed by electricity, so that the compressed gas in the gas tank does not enter the oil tank, and the oil supply system normally supplies oil;

[0030] When the oil supply system fails:

[0031] The pipeline pressure sensor detects that the oil supply pressure in the oil pipe decreases, and sends a pressure signal to the PLC controller;

[0032] The PLC controller receives the pressure signal, cuts off the power supply of the normally-opened air electromagnetic valve, opens the air pipe, and makes the compressed gas in the gas tank enter the oil tank, so that the oil in the oil tank is sent to the oil pipe, and the oil supply pressure of the oil tank is kept constant;

[0033] The time-delay disconnecting relay loses power and starts timing, the time-delay disconnecting relay switch is opened when the predetermined time is reached, the normally-closed cut-off electromagnetic valve loses power and closes the air pipe, the normally-opened air electromagnetic valve loses power and opens the exhaust pipe, the remaining gas in the oil tank is exhausted, the emergency oil supply system stops supplying oil, and the PLC controller detects that the oil supply is abnormal, and sends a pressure loss alarm signal to the speed control system to stop immediately.

[0034] Further, when the system is abnormally powered off: the PLC controller is powered off and stops working, the normally open gas supply solenoid valve is powered off and opened, the capacitor supplies power to the normally open gas supply solenoid valve and the normally closed stop solenoid valve, the normally open gas supply solenoid valve remains closed, and the normally closed stop solenoid valve remains opened, so that the compressed gas in the gas tank enters the oil tank to send the oil to the oil pipe, and the oil supply keeps the oil supply pressure of the oil tank constant.

[0035] The delay disconnect relay is powered off and starts timing, and when the predetermined time is reached, the delay disconnect relay switch is disconnected, the normally closed stop solenoid valve is powered off and the gas pipe is closed, the normally open gas supply solenoid valve is powered off and the exhaust pipe is opened, the remaining gas in the oil tank is exhausted, and the emergency oil supply system stops supplying oil. If the speed system is still working at this time, the pressure loss alarm signal is effective immediately after the system is powered off.

[0036] The technical effects and advantages of the present application are as follows: 1. The present application improves the emergency oil supply system based on the compressed gas source, adds constant pressure and full-automatic control functions, sets the exhaust solenoid valve and the stop solenoid valve on the gas pipe, uses the delay disconnect relay for logical control, uses the stable and reliable super capacitor as the backup power supply after the system is powered off, and realizes the constant pressure control and full-automatic control of the emergency oil supply system with simple structure and low cost, so that the emergency oil supply system can provide constant pressure and time-adjustable emergency oil supply function.

[0037] 2. The throttle valve and the protective cover are arranged at the exhaust port of the normally open gas supply solenoid valve, so that the staff can be prevented from being injured by the high flow rate of the exhaust pipe.

[0038] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0040] Figure 1-a It is a structural schematic diagram of the emergency oil supply system of the prior art 1.

[0041] Figure 1-b It is a structural schematic diagram of the emergency oil supply system of the prior art 1.

[0042] Figure 1-c This is a schematic diagram of the emergency oil supply system of prior art 1;

[0043] Figure 2 This is a schematic diagram of the fully automatic constant pressure emergency oil supply system in an embodiment of the present invention;

[0044] In the diagram, 1. High-speed speed increaser; 2. Lubricating oil supply system; 3. Oil pipe; 4. Pipeline pressure sensor; 5. Check valve; 6. Energy accumulator; 7. Oil storage tank; 8. Air pipe; 9. First solenoid valve; 10. Manual shut-off valve; 11. Air storage tank; 12. Backup oil supply pump; 13. PLC controller; 14. UPS; 15. Protective cover; 16. Normally open air solenoid valve; 17. Normally open air supply solenoid valve; 18. Time-delay disconnect relay; 19. Power supply; 20. Charging resistor; 21. Time-delay disconnect relay switch; 22. Capacitor; 23. Normally closed shut-off solenoid valve; 24. Throttle valve. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] To address the shortcomings of existing technologies, this invention discloses a fully automatic constant pressure emergency oil supply system, such as... Figure 2 As shown, the emergency oil supply system includes a high-speed speed increaser 1, a lubricating oil supply system 2, an oil storage tank 7, an air storage tank 11, a PLC controller 13, and a control unit.

[0047] The oil storage tank 7 is connected to one end of the exhaust pipe. The oil storage tank 7, the lubricating oil supply system 2, and the high-speed speed increaser 1 are connected in pairs through oil pipes 3. A pipeline pressure sensor 4 is installed on the oil pipe 3 between the high-speed speed increaser 1 and the oil storage tank 7. Both the high-speed speed increaser 1 and the pipeline pressure sensor 4 are connected to the input terminal of the PLC controller 13. The pipeline pressure sensor 4 is used to detect the oil supply pressure of the oil storage tank 7 and send a pressure signal to the PLC controller 13. The high-speed speed increaser 1 is used to send a speed signal to the PLC controller 13. The PLC controller 13 is used to receive the pressure signal and the speed signal and send a pressure loss alarm signal to the speed control system to achieve immediate stop.

[0048] The gas tank 11 is connected with the oil tank through the gas pipe 8, and the gas pipe 8 is provided with a normally open gas supply electromagnetic valve 17, which is electrically connected with the PLC controller 13; the gas pipe 8 and the exhaust pipe are connected with the control unit, and a protective cover 15 is arranged at the port of the exhaust pipe to avoid that the lubricating oil is brought out due to the too high flow rate when the oil tank 7 is discharging, thereby causing injury; the output end of the PLC controller 13 is electrically connected with the control unit, and the control unit is used for controlling the opening and closing of the gas pipe 8 and the exhaust pipe.

[0049] The control unit comprises a normally open gas supply electromagnetic valve 16, a normally closed cut-off electromagnetic valve 23 and a control circuit, the normally open gas supply electromagnetic valve 16 is arranged on the exhaust pipe and is used for controlling the discharging of the oil tank 7, a throttle valve 24 is arranged at the exhaust port of the normally open gas supply electromagnetic valve 16, and the throttle valve 24 is arranged to avoid that the lubricating oil is brought out due to the too high flow rate when the oil tank 7 is discharging, thereby causing injury; the normally closed cut-off electromagnetic valve 23 is arranged on the gas pipe 8 and is used for controlling the discharging of the gas tank 11.

[0050] The normally open gas supply electromagnetic valve 16 and the normally closed cut-off electromagnetic valve 23 are electrically connected with the control circuit, the control circuit is used for controlling the opening and closing of the normally open gas supply electromagnetic valve 16 and the normally closed cut-off electromagnetic valve 23, thereby realizing the control of the discharging of the oil tank 7 and the gas tank 11; and the output end of the PLC controller 13 is electrically connected with the control circuit.

[0051] The control circuit comprises a power supply 19, a delay cut-off relay 18 switch, the delay cut-off relay 18, a charging resistor 20 and a capacitor 22; wherein the power supply 19 is a 24V power supply, and the capacitor 22 is a 24V super capacitor.

[0052] The charging resistor 20 and the capacitor 22 are connected in series, the power supply 19 is connected in parallel with the charging resistor 20, the delay cut-off relay 18 switch is connected in series with the power supply 19 and the charging resistor 20, and the delay cut-off relay 18 is connected in series with the power supply 19 and the charging resistor 20.

[0053] The delay cut-off relay 18 is electrically connected with the PLC controller 13, and the delay cut-off relay 18 is used for controlling the opening and closing of the delay cut-off relay 18 switch, and the delay cut-off relay 18 switch is used for controlling the power supply of the capacitor 22 to the normally open gas supply electromagnetic valve 16 and the normally closed cut-off electromagnetic valve 23.

[0054] On the basis of the full-automatic constant-pressure emergency oil supply system, the application further provides a full-automatic constant-pressure emergency oil supply method,

[0055] When the emergency oil supply system is normally working:

[0056] The normally closed cut-off electromagnetic valve 23 is powered to open, the normally open gas electromagnetic valve 16 is powered to close, the PLC controller 13 controls the normally open gas electromagnetic valve 17 to be powered to close, the compressed gas in the gas tank 11 does not enter the oil tank 7, and the oil supply system 2 normally supplies oil;

[0057] When the oil supply system 2 fails:

[0058] The pipeline pressure sensor 4 detects that the oil supply pressure in the oil pipe 3 is reduced and sends a pressure signal to the PLC controller 13;

[0059] After the PLC controller 13 receives the pressure signal, the power supply of the normally open gas electromagnetic valve 17 is cut off, the gas pipe 8 is opened, the compressed gas in the gas tank 11 enters the oil tank 7, and the oil in the oil tank 7 is sent to the oil pipe 3, so that the oil supply pressure of the oil tank 7 is kept constant;

[0060] At this time, the delay cut-off relay 18 loses power and starts timing, and after a predetermined time, the delay cut-off relay 18 switch is cut off, causing the normally closed cut-off electromagnetic valve 23 to lose power and close the gas pipe 8; at the same time, the normally open gas electromagnetic valve 16 loses power and opens the exhaust pipe to empty the remaining gas in the oil tank 7, and the emergency oil supply system stops supplying oil. When the PLC controller 13 detects that the oil supply is abnormal, it sends a pressure loss alarm signal to the speed control system to immediately stop.

[0061] When the system abnormally powers off:

[0062] The PLC controller 13 loses power and stops working, the normally open gas electromagnetic valve 17 loses power and opens, the capacitor 22 supplies power to the normally open gas electromagnetic valve 16 and the normally closed cut-off electromagnetic valve 23, the normally open gas electromagnetic valve 16 remains closed, and the normally closed cut-off electromagnetic valve 23 remains open, so that the compressed gas in the gas tank 11 enters the oil tank 7 and sends the oil in the oil tank 7 to the oil pipe 3, so that the oil supply pressure of the oil tank 7 is kept constant;

[0063] The delay cut-off relay 18 loses power and starts timing, and after a predetermined time, the delay cut-off relay 18 switch is cut off, causing the normally closed cut-off electromagnetic valve 23 to lose power and close the gas pipe 8, the normally open gas electromagnetic valve 16 loses power and opens the exhaust pipe to empty the remaining gas in the oil tank 7, and the emergency oil supply system stops supplying oil. If the speed system is still working, the pressure loss alarm signal takes effect immediately after the system powers off.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application shall be included in the protection scope of the present application.

Claims

1. A fully automatic constant pressure emergency oil supply system, characterized in that, The emergency oil supply system comprises a high-speed speed increaser (1), an oil supply system (2), an oil tank (7), a gas tank (11), a PLC controller (13) and a control unit, The oil tank (7) is connected with one end of the exhaust pipe, and the oil tank (7), the oil supply system (2) and the high-speed speed increaser (1) are connected with each other through oil pipes (3); A pipeline pressure sensor (4) is installed on the oil pipe (3) between the high-speed speed increaser (1) and the oil tank (7), and the high-speed speed increaser (1) and the pipeline pressure sensor (4) are electrically connected with the PLC controller (13); the pipeline pressure sensor (4) is used for detecting the oil supply pressure in the oil pipe (3) and sending a pressure signal to the PLC controller (13) after the oil supply pressure decreases, and the PLC controller (13) is used for sending a pressure loss alarm signal to the outside according to the received pressure signal; The gas tank (11) is connected with the oil tank (7) through a gas pipe (8), and a normally open gas supply electromagnetic valve (17) is arranged on the gas pipe (8); the normally open gas supply electromagnetic valve (17) is electrically connected with the PLC controller (13); the exhaust pipe and the gas pipe (8) are connected with the control unit respectively, the PLC controller (13) is electrically connected with the control unit, and the control unit is used for controlling the opening and closing of the gas pipe (8) and the opening and closing of the exhaust pipe; The control unit comprises a normally open gas electromagnetic valve (16), a normally closed cut-off electromagnetic valve (23) and a control circuit, the normally open gas electromagnetic valve (16) is arranged on the exhaust pipe and is used for controlling the gas release of the oil tank (7), the normally closed cut-off electromagnetic valve (23) is arranged on the gas pipe (8) and is used for controlling the gas release of the gas tank (11); the normally open gas electromagnetic valve (16) and the normally closed cut-off electromagnetic valve (23) are electrically connected with the control circuit, and the control circuit is used for controlling the opening and closing of the normally open gas electromagnetic valve (16) and the normally closed cut-off electromagnetic valve (23); the PLC controller (13) is electrically connected with the control circuit; The control circuit comprises a power supply (19), a time delay disconnecting relay switch, a time delay disconnecting relay (18), a charging resistor (20) and a capacitor (22); the charging resistor (20) and the capacitor (22) are connected in series, the power supply (19) is connected in parallel with the charging resistor (20), the time delay disconnecting relay switch is connected in series with the power supply (19) and the charging resistor (20), and the time delay disconnecting relay (18) is connected in series with the power supply (19) and the charging resistor (20); the time delay disconnecting relay (18) is electrically connected with the PLC controller (13), the time delay disconnecting relay (18) is used for controlling the opening and closing of the time delay disconnecting relay switch, and the time delay disconnecting relay switch is used for controlling the capacitor (22) to supply power to the normally open gas electromagnetic valve (16) and the normally closed cut-off electromagnetic valve (23). ​ 2. The fully automatic constant pressure emergency oil supply system according to claim 1, characterized in that, the power supply (19) is a 24V power supply.

3. The fully automatic constant pressure emergency oil supply system according to claim 1, characterized in that, the capacitor (22) is a 24V super capacitor.

4. The fully automatic constant pressure emergency oil supply system according to claim 1, characterized in that, a throttle valve (24) is installed on the exhaust pipe, and the throttle valve (24) is located at the exhaust port of the normally open air electromagnetic valve (16).

5. The fully automatic constant pressure emergency oil supply system according to claim 4, characterized in that, a protective cover (15) is installed at the exhaust pipe port.

6. A fully automatic constant pressure emergency oil supply method characterized by, The emergency oil supply method is applied to the emergency oil supply system of any one of claims 1 to 5, and the emergency oil supply method comprises, when working normally: the normally closed cut-off electromagnetic valve (23) is powered on to open, the normally open air electromagnetic valve (16) is powered off to close, the PLC controller (13) controls the normally open air supply electromagnetic valve (17) to be powered off to close, so that the compressed gas in the gas tank (11) does not enter the oil tank (7), and the oil supply system (2) normally supplies oil; when the oil supply system (2) fails: after the pipeline pressure sensor (4) detects that the oil supply pressure in the oil pipe (3) decreases, it sends a pressure signal to the PLC controller (13); after the PLC controller (13) receives the pressure signal, it cuts off the power supply of the normally open air supply electromagnetic valve (17), so that the air pipe (8) is opened, the compressed gas in the gas tank (11) enters the oil tank (7), and the oil in the oil tank (7) is sent to the oil pipe (3), so that the oil supply pressure of the oil tank (7) remains constant; the delay cut-off relay (18) loses power and starts timing, and when the predetermined time is reached, the delay cut-off relay (18) is switched off, the normally closed cut-off electromagnetic valve (23) loses power and closes the air pipe (8), the normally open air electromagnetic valve (16) loses power and opens the exhaust pipe, so that the residual gas in the oil tank (7) is exhausted, the emergency oil supply system stops supplying oil, and the PLC controller (13) detects that the oil supply is abnormal and sends a pressure loss alarm signal to the speed control system to immediately stop.

7. The fully automatic constant pressure emergency fuel oil supply method according to claim 6, characterized by, including, when the system abnormally loses power: the PLC controller (13) loses power and stops working, the normally open air supply electromagnetic valve (17) loses power and opens, the capacitor (22) supplies power to the normally open air electromagnetic valve (16) and the normally closed cut-off electromagnetic valve (23), the normally open air electromagnetic valve (16) remains closed, and the normally closed cut-off electromagnetic valve (23) remains open, so that the compressed gas in the gas tank (11) enters the oil tank (7) and sends the oil to the oil pipe (3), so that the oil supply pressure of the oil tank (7) remains constant; The time delay disconnect relay (18) starts timing when losing power, and opens the switch when reaching the predetermined time. The normally closed cut-off electromagnetic valve (23) loses power and closes the air pipe (8), and the normally open air electromagnetic valve (16) loses power and opens the exhaust pipe, so that the residual air in the oil tank (7) is exhausted, and the emergency oil supply system stops supplying oil. If the speed system is still working at this time, the power loss pressure loss alarm signal takes effect immediately to stop the vehicle.

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