CN114562489A - Hydraulic control system for emergency power source and control method thereof - Google Patents
Hydraulic control system for emergency power source and control method thereof Download PDFInfo
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- CN114562489A CN114562489A CN202210181724.5A CN202210181724A CN114562489A CN 114562489 A CN114562489 A CN 114562489A CN 202210181724 A CN202210181724 A CN 202210181724A CN 114562489 A CN114562489 A CN 114562489A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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Abstract
The invention discloses a hydraulic control system for an emergency power source and a control method thereof, which are a backup emergency hydraulic control system of an emergency disengaging device, can provide the emergency hydraulic power source for the emergency disengaging device and control the action of the emergency disengaging device, can realize that a hydraulic pump station supplements hydraulic energy for the emergency power source to store and stand by when the emergency disengaging device does not work, can start the emergency power source to provide hydraulic power when the emergency disengaging is to be realized, realizes the emergency disengaging function, and provides a redundancy solution for ensuring the reliable work of the emergency disengaging device, thereby improving the safety and the reliability of the emergency disengaging device.
Description
Technical Field
The invention belongs to the field of control of emergency release devices of offshore LNG (liquefied natural gas) conveying systems, and particularly relates to a hydraulic control system for an emergency power source and a control method thereof.
Background
An offshore LNG transfer system is an ultra-low temperature liquid transfer system, and an emergency release device is generally provided in the system to cope with a dangerous situation that may occur during the operation of the LNG transfer system. When the pipeline connection between the two platforms needs to be disconnected in case of fire leakage and other dangerous situations of the conveying system, the emergency separation device can be started to realize the separation of the conveying system pipeline between the conveying platform and the receiving platform.
The emergency separation device configured for the LNG conveying system is driven by hydraulic pressure, and when the function needs to be started, the hydraulic pump station is started to provide power to drive the separation mechanism to move, so that system separation is realized.
At present, the emergency separation device configured by the LNG conveying system in the industry adopts a pneumatic type and a hydraulic type, compared with a hydraulic driving type, the pneumatic type emergency separation device has unstable starting pressure, higher air pressure danger coefficient, large flow resistance and smaller application range.
The hydraulic drive type is usually driven by double motors at present and is mutually standby. However, if power is lost, the device cannot operate and is in a dangerous state for a long time.
Disclosure of Invention
The invention aims to provide a hydraulic control system for an emergency power source and a control method thereof, which are a backup emergency hydraulic control system of an emergency disengaging device, can provide the emergency hydraulic power source for the emergency disengaging device, control the action of the emergency disengaging device and provide a redundancy solution for ensuring the reliable work of the emergency disengaging device, thereby improving the safety and the reliability of the emergency disengaging device.
The technical solution for realizing the purpose of the invention is as follows: a hydraulic control system for an emergency power source comprises a driving device, a hydraulic pump, a hydraulic oil tank, a one-way valve, an overflow valve, an electromagnetic directional valve, a disengaging oil cylinder, a hydraulic control one-way valve, an electromagnetic ball valve, an energy accumulator, a pressure sensor and a controller;
the driving device is used for driving the hydraulic pump to operate;
the hydraulic pump is driven by the driving equipment to convert electric energy into hydraulic energy so as to provide power for the hydraulic control system;
the hydraulic oil tank is used for storing hydraulic oil, and specifically: on one hand, the hydraulic pump sucks hydraulic oil output pressure oil P from the hydraulic oil tank, and on the other hand, return oil T of the hydraulic control system flows back to the hydraulic oil tank;
the one-way valve is arranged at the outlet of the hydraulic pump to realize one-way cut-off to prevent the emergency power source from leaking from the hydraulic pump and ensure that high-pressure oil is always kept on an oil way between the emergency power source and the electromagnetic reversing valve;
the overflow valve is used for controlling the highest pressure of the hydraulic control system;
the electromagnetic directional valve is used for controlling the movement of the separation oil cylinder, and when the valve core of the electromagnetic directional valve is positioned at the middle position, the separation oil cylinder does not move; when the electromagnet on the left side of the electromagnetic directional valve is electrified, a cylinder rod separated from the oil cylinder is controlled to extend out; when the electromagnet on the right side of the electromagnetic directional valve is electrified, the cylinder rod separated from the oil cylinder is controlled to retract;
the separation oil cylinder is used as a hydraulic execution element on the emergency separation device, and the LNG conveying system pipeline is separated emergently through the movement of the separation oil cylinder;
the hydraulic control one-way valve is used as a logic element of a hydraulic control system and has single-phase conduction capability; when the emergency power source needs to supplement hydraulic pressure oil, the pressure oil supplements the hydraulic pressure oil source for the energy accumulator through the hydraulic control one-way valve; when the emergency power source needs to be started to control the emergency separation device to work, the hydraulic control one-way valve is opened through a control port K of the hydraulic control one-way valve, and the emergency power source is provided for the emergency separation device;
the electromagnetic ball valve is used for controlling the opening of the hydraulic control one-way valve and conveying an emergency power source in the energy accumulator to a pressure oil pipeline in the hydraulic control system to serve as a power source;
the energy accumulator is used as a hydraulic energy storage element of the emergency hydraulic power source;
the pressure sensor is used for detecting a hydraulic pressure signal in the energy accumulator, when the hydraulic pressure stored in the energy accumulator is lower than a set value, the hydraulic pump is started to charge the energy accumulator until the pressure reaches a set value, and the charge is stopped, so that a high-pressure emergency power oil source is always maintained in the energy accumulator;
the controller is used as a signal receiving and processing control unit, and outputs an oil supplementing control signal when receiving a low-pressure signal, and the hydraulic pump is started to supplement pressure oil for the energy accumulator; when the high-pressure signal is received, a pump stopping control signal is sent out, and the hydraulic pump stops replenishing pressure oil.
Further, the system also comprises a switch valve arranged between the hydraulic control one-way valve and the energy accumulator, when the system works normally, the switch valve is in an open state, and when the energy accumulator needs to be maintained or replaced, the switch valve is closed.
Furthermore, the two overflow valves are provided, one of the two overflow valves is arranged on a pressure oil path of the hydraulic control system, and is specifically arranged between an outlet pipeline of the one-way valve and the hydraulic oil tank, and the two overflow valves are used for controlling the working pressure output by the hydraulic pump not to exceed a set value; the other one is arranged on a control oil path of the accumulator, particularly arranged in front of an inlet pipeline of the accumulator, and the tail end of the other one is connected to a hydraulic oil tank for controlling the pressure of the emergency power source stored in the accumulator to exceed a set safety value.
Furthermore, the set pressure values of the high-pressure or low-pressure signals in the overflow valve and the controller are adjustable so as to meet the requirements of different working conditions.
Further, the number of the accumulators is at least one.
Further, the pressure sensor and the controller are replaced by two explosion-proof pressure relays, wherein one is a normally open type and the other is a normally closed type; when a low-voltage signal is detected, the normally open type explosion-proof pressure relay is closed, the control circuit is conducted, and the hydraulic pump is triggered to operate to supplement the hydraulic active source; when a high-pressure signal is detected, the normally closed explosion-proof pressure relay is opened, the control circuit is disconnected, and the hydraulic pump stops running.
A control method for a hydraulic control system for an emergency power source, the method comprising:
when the hydraulic pressure oil in the energy accumulator is lower than a set value, the pressure sensor detects a low-pressure signal and sends the low-pressure signal to the controller, and the controller controls the driving equipment to start through signal processing; the hydraulic pump runs under the drive of the driving equipment to generate high-pressure hydraulic oil, and the pressure active source P supplements the high-pressure oil for the energy accumulator through the one-way valve, the hydraulic control one-way valve and the switch valve, and is stored as an emergency power source for later use;
when hydraulic pressure oil in the energy accumulator reaches a set value, the pressure sensor detects that a high-pressure signal is sent to the controller, the controller controls the driving equipment to stop working through signal processing, and the hydraulic pump stops running;
when the LNG low-temperature conveying system is triggered to be emergently separated, the electromagnetic ball valve is electrified to work, a control opening K of the hydraulic control one-way valve obtains high-pressure oil to drive the one-way valve to open, and the energy accumulator serves as an emergency power source to provide power for the hydraulic control system; the high-pressure oil of the emergency power source acts on a P port of the electromagnetic directional valve to standby, when an electromagnet on the right side of the electromagnetic directional valve is electrified, a cylinder rod of the separation oil cylinder is controlled to retract, the emergency separation device is separated, and further separation of the LNG low-temperature conveying system pipeline between the conveying platform and the receiving platform is achieved.
Compared with the prior art, the invention has the following remarkable advantages:
1) the explosion-proof motor is used as a driving device to drive the hydraulic pump to operate, and the requirements of the LNG conveying system on the operating environment can be met.
2) The outlet of the hydraulic pump is provided with the check valve for one-way stopping, so that the hydraulic pump is convenient to maintain and replace in the later period on one hand, and on the other hand, when the emergency power source is started, the emergency power source can be prevented from leaking from the hydraulic pump, and the high-pressure oil is always kept on an oil way between the emergency power source and the electromagnetic directional valve.
3) An overflow valve is arranged on a pressure oil path of the hydraulic control system, so that the working pressure output by the hydraulic pump cannot exceed a set value, and the hydraulic system is prevented from being damaged by high pressure; meanwhile, an overflow valve is arranged on a control oil path of the energy accumulator, so that the pressure of an emergency power source stored in the energy accumulator is prevented from exceeding a safety value, and the overpressure failure of the energy accumulator is prevented.
4) The switch valve is arranged, so that maintenance work of the energy accumulator can be carried out under the condition that normal work of a hydraulic system is not influenced.
5) Through the combination of the pressure sensor and the controller, the pressure oil can be supplemented to the energy accumulator in time or stopped to be supplemented, and the energy accumulator is ensured to maintain a high-pressure emergency power oil source all the time.
6) The set pressure value of the high-pressure or low-pressure signal in the overflow valve and the controller can be adjusted according to actual working conditions so as to meet requirements of different working conditions.
7) The number of accumulators may be increased as needed to meet the demand for an emergency power source of the emergency disconnect system.
8) Compared with a universal hydraulic drive system, the control system is additionally provided with the energy storage device, and the energy storage device can be driven for many times through the energy storage device per se under the condition of lacking of electric power output, so that the device action is met, and the safety of the working state of the device is guaranteed.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is a schematic diagram of a hydraulic control system in one embodiment, wherein a letter P indicates pressure oil at an outlet of a hydraulic pump, a letter T indicates an oil return path of the hydraulic control system, and a letter K indicates a pilot-controlled check valve control oil path.
FIG. 2 is a schematic diagram of a hydraulic control system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In order to further improve the reliability of a hydraulic system of the emergency separation device and prevent the occurrence of unexpected situations such as the system cannot work normally due to the fault of a hydraulic pump station, a standby emergency power source is adopted, and a hydraulic control system of the emergency power source and a control method thereof are designed. When the emergency separation device does not work, the hydraulic pump station supplies hydraulic energy for the emergency power source to store and standby, and when the emergency separation is to be realized, the emergency power source can be started to provide hydraulic power to realize the emergency separation function, so that the reliability of the emergency separation device is improved.
In one embodiment, referring to fig. 1, a hydraulic control system for an emergency power source is provided, the system includes an explosion-proof motor 1, a hydraulic pump 2, a hydraulic oil tank 3, a check valve 4, an overflow valve 5, an electromagnetic directional valve 6, a disengagement oil cylinder 7, a hydraulic control check valve 8, an electromagnetic ball valve 9, an accumulator 11, a pressure sensor 12, and a controller 13;
the explosion-proof motor 1 is used for driving the hydraulic pump 2 to operate;
here, adopt explosion-proof motor 1 as drive arrangement drive hydraulic pump 2 operation, can satisfy LNG conveying system operation environmental requirement.
The hydraulic pump 2 is driven by the driving equipment 1 to convert electric energy into hydraulic energy to provide power for a hydraulic control system; on one hand, the emergency separation device can be powered to drive the emergency separation device to work, on the other hand, the hydraulic pressure can be supplemented for the emergency power source, and the hydraulic pressure is stored in the energy accumulator 11 and used as a standby power source for emergency separation action;
the hydraulic oil tank 3 is used for storing hydraulic oil, and specifically: on one hand, the hydraulic pump 2 absorbs hydraulic oil from the hydraulic oil tank 3 to output pressure oil P, and on the other hand, return oil T of the hydraulic control system flows back to the hydraulic oil tank 3;
the one-way valve 4 is arranged at the outlet of the hydraulic pump 2 to realize one-way cut-off, so that the maintenance and replacement of the hydraulic pump at the later stage are facilitated, and the emergency power source can be prevented from leaking from the hydraulic pump 2 when being started, and high-pressure oil is always kept on an oil path between the emergency power source and the electromagnetic directional valve 6;
the overflow valve 5 is used for controlling the highest pressure of the hydraulic control system;
here, the overflow valves 5 are provided with two overflow valves, one of which is arranged on a pressure oil path of the hydraulic control system, specifically between an outlet pipeline of the check valve 4 and the hydraulic oil tank 3, and is used for controlling the working pressure output by the hydraulic pump 2 not to exceed a set value; and the other is arranged on a control oil path of the accumulator 11, particularly in front of an inlet pipeline of the accumulator 11, and the tail end of the other is connected to the hydraulic oil tank 3 for controlling the pressure of the emergency power source stored in the accumulator 11 to exceed a set safety value.
The electromagnetic directional valve 6 is used for controlling the movement of the separation oil cylinder 7, and when the valve core of the electromagnetic directional valve 6 is positioned at the middle position, the separation oil cylinder does not move; when the electromagnet on the left side of the electromagnetic directional valve 6 is electrified, the cylinder rod of the separation oil cylinder 7 is controlled to extend out; when the electromagnet on the right side of the electromagnetic directional valve 6 is electrified, the cylinder rod of the disengaging oil cylinder 7 is controlled to retract;
the separation oil cylinder 7 is used as a hydraulic execution element on the emergency separation device, and the LNG conveying system pipeline is separated emergently through the movement of the separation oil cylinder 7;
the hydraulic control one-way valve 8 is used as a logic element of a hydraulic control system and has single-phase conduction capability; when the emergency power source needs to supplement hydraulic pressure oil, the pressure oil supplements the hydraulic pressure oil source for the energy accumulator 11 through the hydraulic control one-way valve 8; when the emergency power source needs to be started to control the emergency separation device to work, the hydraulic control one-way valve 8 is opened through the control port K of the hydraulic control one-way valve 8, and the emergency power source is provided for the emergency separation device;
the electromagnetic ball valve 9 is used for controlling the opening of the hydraulic control one-way valve 8 and conveying an emergency power source in the energy accumulator 11 to a pressure oil pipeline in a hydraulic control system to serve as a power source; as shown in fig. 1, at this time, the electromagnet of the electromagnetic ball valve 9 loses power, the hydraulic control check valve 8 is closed, and the accumulator is in a pressure maintaining state; when the electromagnet of the electromagnetic ball valve 9 is electrified, the valve core is reversed, the control port K of the one-way valve 8 obtains high-pressure oil to drive the one-way valve to open, and the energy accumulator serves as an emergency power source to provide power for the hydraulic control system;
as shown in fig. 1, when the system normally works, the switch valve 10 is in an open state, and when the accumulator needs to be repaired or replaced, the switch valve 10 is closed, so that the maintenance work of the accumulator 11 can be carried out without affecting the normal work of the hydraulic system;
the accumulator 11 is used as a hydraulic energy storage element of an emergency hydraulic power source, and high-pressure oil is stored in the accumulator 11 through a hydraulic system and is used as the emergency power source for storage. When the emergency power source in the energy accumulator 11 needs to be started, the emergency power source can be used for driving the emergency separation oil cylinder 7 to move through the control logic in the hydraulic control system;
here, the number of the accumulators 11 is at least one, and the demand for the emergency power source of the emergency release system can be satisfied by increasing the number of the accumulators 11.
The pressure sensor 12 is used for detecting a hydraulic pressure signal in the accumulator 11, and when the hydraulic pressure stored in the accumulator 11 is lower than a set value, the hydraulic pump 2 is started to charge the accumulator 11 until the pressure reaches a set value, and the charging is stopped, so that a high-pressure emergency power oil source is always maintained in the accumulator 11;
the controller 13 is used as a signal receiving and processing control unit, and outputs an oil supplementing control signal when receiving a low-pressure signal, so that the hydraulic pump 2 is started to supplement pressure oil for the energy accumulator 11; when receiving the high pressure signal, the hydraulic pump 2 stops replenishing the pressure oil by sending a pump stop control signal.
The control method of the hydraulic control system for the emergency power source has the working principle that:
when the hydraulic pressure oil in the energy accumulator 11 is lower than a set value, the pressure sensor 12 detects that a low-pressure signal is sent to the controller 13, and the controller 13 controls the driving device 1 to start through signal processing; the hydraulic pump 2 runs under the driving of the driving device 1 to generate high-pressure hydraulic oil, and the pressure active source P supplements the high-pressure oil for the energy accumulator 11 through the one-way valve 4, the hydraulic control one-way valve 8 and the switch valve 10 and stores the high-pressure oil as an emergency power source for later use;
when the hydraulic pressure oil in the energy accumulator 11 reaches a set value, the pressure sensor 12 detects that a high-pressure signal is sent to the controller 13, the controller 13 controls the driving device 1 to stop working through signal processing, and the hydraulic pump 2 stops running;
when the LNG low-temperature conveying system is triggered to be emergently separated, the electromagnetic ball valve 9 is electrified to work, the control port K of the hydraulic control one-way valve 8 obtains high-pressure oil to drive the one-way valve 4 to be opened, and the energy accumulator 11 serves as an emergency power source to provide power for the hydraulic control system; the high-pressure oil of the emergency power source acts on a P port of the electromagnetic directional valve 6 to stand by, when an electromagnet on the right side of the electromagnetic directional valve 6 is electrified, a cylinder rod of the separation oil cylinder 7 is controlled to retract, the emergency separation device is separated, and further separation of an LNG low-temperature conveying system pipeline between a conveying platform and a receiving platform is achieved.
In one embodiment, in conjunction with fig. 2, a hydraulic control system for an emergency power source is provided, which differs from the control system of the previous embodiment in that the pressure sensor 12 and the controller 13 are replaced by two explosion-proof pressure relays, one of which is normally open and one of which is normally closed; when a low-voltage signal is detected, the normally open type explosion-proof pressure relay is closed, the control circuit is conducted, and the hydraulic pump 2 is triggered to operate to supplement hydraulic power; when a high-pressure signal is detected, the normally closed explosion-proof pressure relay is opened, the control circuit is disconnected, and the hydraulic pump 2 stops operating.
The invention provides a backup emergency hydraulic control system of an emergency release device, which can provide an emergency hydraulic power source for the emergency release device, control the action of the emergency release device and provide a redundancy solution for ensuring the reliable work of the emergency release device, thereby improving the safety and the reliability of the emergency release device.
The technical solutions of the present invention are not limited to the above embodiments, and all technical solutions obtained by using equivalent substitution modes fall within the scope of the present invention.
Claims (8)
1. The hydraulic control system for the emergency power source is characterized by comprising a driving device (1), a hydraulic pump (2), a hydraulic oil tank (3), a one-way valve (4), an overflow valve (5), an electromagnetic directional valve (6), a disengaging oil cylinder (7), a hydraulic control one-way valve (8), an electromagnetic ball valve (9), an energy accumulator (11), a pressure sensor (12) and a controller (13);
the driving device (1) is used for driving the hydraulic pump (2) to operate;
the hydraulic pump (2) is driven by the driving equipment (1) to convert electric energy into hydraulic energy and provide power for a hydraulic control system;
the hydraulic oil tank (3) is used for storing hydraulic oil, and specifically: on one hand, the hydraulic pump (2) sucks hydraulic oil from the hydraulic oil tank (3) to output pressure oil P, and on the other hand, return oil T of the hydraulic control system flows back to the hydraulic oil tank (3);
the one-way valve (4) is arranged at an outlet of the hydraulic pump (2) to realize one-way cut-off to prevent the emergency power source from leaking from the hydraulic pump (2) and ensure that high-pressure oil is always kept on an oil way between the emergency power source and the electromagnetic reversing valve (6);
the overflow valve (5) is used for controlling the highest pressure of the hydraulic control system;
the electromagnetic reversing valve (6) is used for controlling the movement of the disengaging oil cylinder (7), and when the valve core of the electromagnetic reversing valve (6) is in a middle position, the disengaging oil cylinder does not move; when the electromagnet on the left side of the electromagnetic directional valve (6) is electrified, a cylinder rod of the separation oil cylinder (7) is controlled to extend out; when the electromagnet on the right side of the electromagnetic directional valve (6) is electrified, the cylinder rod of the disengaging oil cylinder (7) is controlled to retract;
the separation oil cylinder (7) is used as a hydraulic execution element on the emergency separation device, and the LNG conveying system pipeline is separated emergently through the movement of the separation oil cylinder (7);
the hydraulic control one-way valve (8) is used as a logic element of the hydraulic control system and has single-phase conduction capability; when the emergency power source needs to supplement hydraulic pressure oil, the pressure oil supplements the hydraulic pressure oil source for the energy accumulator (11) through the hydraulic control one-way valve (8); when the emergency power source needs to be started to control the emergency separation device to work, the hydraulic control one-way valve (8) is opened through a control port K of the hydraulic control one-way valve (8), and the emergency power source is provided for the emergency separation device;
the electromagnetic ball valve (9) is used for controlling the opening of the hydraulic control one-way valve (8) and conveying an emergency power source in the energy accumulator (11) to a pressure oil pipeline in the hydraulic control system to be used as a power source;
the energy accumulator (11) is used as a hydraulic energy storage element of an emergency hydraulic power source;
the pressure sensor (12) is used for detecting a hydraulic pressure signal in the energy accumulator (11), when the hydraulic pressure stored in the energy accumulator (11) is lower than a set value, the hydraulic pump (2) is started to charge the energy accumulator (11) until the pressure reaches a set value, and the charging is stopped, so that a high-pressure emergency power oil source is always maintained in the energy accumulator (11);
the controller (13) is used as a signal receiving and processing control unit, and outputs an oil supplementing control signal when receiving a low-pressure signal, so that the hydraulic pump (2) is started to supplement pressure oil for the energy accumulator (11); when receiving the high pressure signal, the hydraulic pump (2) stops replenishing pressure oil by sending a pump stopping control signal.
2. The hydraulic control system for an emergency power source according to claim 1, further comprising a switching valve (10) disposed between the pilot operated check valve (8) and the accumulator (11), wherein the switching valve (10) is in an open state when the system is in normal operation, and the switching valve (10) is closed when the accumulator needs to be repaired or replaced.
3. The hydraulic control system for an emergency power source according to claim 1, characterized in that the drive device (1) employs an explosion-proof motor.
4. The hydraulic control system for an emergency power source according to claim 1, wherein there are two relief valves (5), one of which is arranged on a pressure oil path of the hydraulic control system, particularly between an outlet pipeline of the check valve (4) and the hydraulic oil tank (3), for controlling the working pressure output by the hydraulic pump (2) not to exceed a set value; the other one is arranged on a control oil path of the accumulator (11), particularly arranged in front of an inlet pipeline of the accumulator (11), and the tail end of the other one is connected to the hydraulic oil tank (3) and used for controlling the pressure of the emergency power source stored in the accumulator (11) to exceed a set safety value.
5. The hydraulic control system for the emergency power source according to claim 1, wherein the relief valve (5) and the set pressure value of the high-pressure or low-pressure signal in the controller (13) are adjustable to meet different working condition requirements.
6. Hydraulic control system for an emergency power source according to claim 1, characterised in that the number of accumulators (11) is at least one.
7. The hydraulic control system for an emergency power source according to claim 1, wherein the pressure sensor (12) and the controller (13) are replaced with two explosion-proof pressure relays, one of normally open type and one of normally closed type; when a low-voltage signal is detected, the normally open type explosion-proof pressure relay is closed, the control circuit is conducted, and the hydraulic pump (2) is triggered to operate to supplement the hydraulic source; when a high-pressure signal is detected, the normally closed explosion-proof pressure relay is opened, the control circuit is disconnected, and the hydraulic pump (2) stops running.
8. The control method of the hydraulic control system for the emergency power source according to any one of claims 1 to 7, characterized by comprising:
when hydraulic pressure oil in the energy accumulator (11) is lower than a set value, a pressure sensor (12) detects a low-pressure signal and sends the low-pressure signal to a controller (13), and the controller (13) controls the driving equipment (1) to start through signal processing; the hydraulic pump (2) runs under the driving of the driving device (1) to generate high-pressure hydraulic oil, and the pressure active source P supplements the high-pressure oil for the energy accumulator (11) through the one-way valve (4), the hydraulic control one-way valve (8) and the switch valve (10) and stores the high-pressure oil as an emergency power source for later use;
when hydraulic pressure oil in the energy accumulator (11) reaches a set value, a pressure sensor (12) detects that a high-pressure signal is sent to a controller (13), the controller (13) controls the driving equipment (1) to stop working through signal processing, and the hydraulic pump (2) stops running;
when the LNG low-temperature conveying system is triggered to be emergently separated, the electromagnetic ball valve (9) is powered to work, the control port K of the hydraulic control one-way valve (8) obtains high-pressure oil to drive the one-way valve (4) to be opened, and at the moment, the energy accumulator (11) serves as an emergency power source to provide power for the hydraulic control system; the high-pressure oil of the emergency power source acts on a P port of the electromagnetic directional valve (6) to stand by, when an electromagnet on the right side of the electromagnetic directional valve (6) is electrified, a cylinder rod of the separation oil cylinder (7) is controlled to retract, the emergency separation device is separated, and further separation of the LNG low-temperature conveying system pipeline between the conveying platform and the receiving platform is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210181724.5A CN114562489A (en) | 2022-02-25 | 2022-02-25 | Hydraulic control system for emergency power source and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210181724.5A CN114562489A (en) | 2022-02-25 | 2022-02-25 | Hydraulic control system for emergency power source and control method thereof |
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| CN114562489A true CN114562489A (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210181724.5A Pending CN114562489A (en) | 2022-02-25 | 2022-02-25 | Hydraulic control system for emergency power source and control method thereof |
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2022
- 2022-02-25 CN CN202210181724.5A patent/CN114562489A/en active Pending
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