Hydraulic steering engine emergency power supply system

Abstract

The invention relates to the technical field of hydraulic steering engines, and discloses a hydraulic steering engine emergency power supply system. The hydraulic steering engine emergency power supply system comprises a control unit, an energy storage device and at least two power units, the energy storage device and the at least two power units are arranged at intervals, the energy storage device and the at least two power units are powered by the power source, the energy storage device is electrically connected with one power unit, and the energy storage device and the at least two power units are electrically connected with the control unit; the steering engine emergency power supply system comprises a normal working mode, a fault working mode and an emergency working mode; in the normal working mode, one power unit is driven to be started, and the other power units are closed; after the control unit receives an error reporting signal of the power unit, the control unit is switched to a fault working mode, the error reporting power unit is closed, one of the remaining power units is driven, and the remaining power units are closed; and when the power supply is cut off, the emergency working mode is switched, and the energy storage device drives the power unit to start.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic steering gears, and in particular to an emergency power supply system for a hydraulic steering gear. Background Art

[0002] The hydraulic steering gear has the advantages of small size, high quality, small space occupation, convenient speed adjustment, easy automation and automatic overload protection, good parts lubrication conditions and long service life.

[0003] like Figure 1 As shown, at present, ships with propeller propulsion are equipped with hydraulic steering gear as steering devices. The core components of the hydraulic steering gear include a hydraulic station and two hydraulic pump systems. The two hydraulic pump systems are driven by asynchronous motors. Among them, the two hydraulic pump systems are divided into one working set and the other standby set to achieve the requirements of steering operation and redundant backup. If the ship is equipped with an emergency generator, one of the hydraulic pump systems can obtain electricity from the power supply system of the emergency generator to achieve steering operation in emergency situations. However, emergency generators are expensive and large in size, so not all ships are equipped with them. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to perform emergency operation without configuring an emergency generator, thereby reducing the production cost of the ship and optimizing the space configuration in the ship.

[0005] In order to solve the above technical problems, the present invention provides a hydraulic steering gear emergency power supply system including a control unit, an energy storage device and at least two power units;

[0006] The energy storage device and at least two power units are arranged at intervals, the energy storage device and the at least two power units are respectively powered by a power supply, the energy storage device is electrically connected to one of the power units, the energy storage device can drive the power unit to start, the power unit can send an error signal to the control unit in the event of a fault, the energy storage device can be charged to full power when not fully charged, and the power is cut off after being fully charged, and the energy storage device and the at least two power units are respectively electrically connected to the control unit;

[0007] The hydraulic steering gear emergency power supply system has normal working mode, fault working mode and emergency working mode;

[0008] In normal working mode, one of the power units is driven to start and the other power units are shut down;

[0009] When the control unit receives the error signal from the power unit, the emergency power supply system of the hydraulic steering gear switches to the fault working mode. The control unit shuts down the power unit that sends the error signal and controls any other power unit to start.

[0010] When the power is cut off, the hydraulic steering gear emergency power supply system switches to the emergency working mode, and the control unit controls the energy storage device to drive the power unit to start.

[0011] Furthermore, one of the power units includes: a frequency converter and a variable frequency motor, the frequency converter is powered by an AC power supply, the variable frequency motor is connected to the frequency converter, the frequency converter is electrically connected to the control unit, the frequency converter can control the speed of the variable frequency motor to start or stop, and the frequency converter can send a signal to the control unit indicating whether the variable frequency motor has an error;

[0012] In normal working mode, the control unit can control the inverter to control the variable frequency motor to start;

[0013] When the control unit receives the error signal from the inverter, it switches to the fault working mode, controls the corresponding inverter motor of the inverter that sends the error signal to turn off, drives the inverter in one of the remaining power units to control the corresponding inverter motor to turn on, and drives the inverters in other power units to control the corresponding inverter motors to turn off.

[0014] Further, the energy storage device includes an energy storage device and a bidirectional inverter, the bidirectional inverter is powered by an AC power supply, the energy storage device is connected to the bidirectional inverter, the bidirectional inverter is connected to the frequency converter through a first circuit, the bidirectional inverter is electrically connected to the control unit and can convert DC power into AC power, and can also convert AC power into DC power;

[0015] In normal working mode, the bidirectional inverter converts AC power into DC power, and charges the energy storage device to full power through the AC power supply when it is not fully charged, and then cuts off the power after it is fully charged;

[0016] In the emergency working mode, the energy storage device releases direct current, which is converted into alternating current through the bidirectional inverter to drive the frequency converter connected to the bidirectional inverter, and the frequency converter controls the frequency conversion motor to start.

[0017] Furthermore, the energy storage device also includes a first switch, which is connected to the front end of the bidirectional inverter. The first switch can control the connection and disconnection between the bidirectional inverter and the AC power supply, and the first switch is electrically connected to the control unit.

[0018] Furthermore, the hydraulic steering gear emergency power supply system also includes a second switch, which can control the connection and disconnection between the power unit connected to the bidirectional inverter and the AC power supply, and the second switch is electrically connected to the control unit.

[0019] Further, the bidirectional inverter is connected to the frequency converter in one of the power units through a first circuit, a third switch is provided on the first circuit, the third switch can control the connection and disconnection between the bidirectional inverter and the variable frequency motor, and the third switch is electrically connected to the control unit;

[0020] The control unit is configured such that: in a normal working mode, the third switch is disconnected, and the first switch and the second switch are turned on;

[0021] In the emergency working mode, the third switch is turned on, and the first switch and the second switch are turned off.

[0022] Furthermore, the first switch, the second switch and the third switch are AC contactors.

[0023] Furthermore, the hydraulic steering gear emergency power supply system also includes a circuit breaker component, which is connected to the front end of the energy storage device and at least two power units, and can connect or disconnect the energy storage device and at least two power units with the power supply.

[0024] Furthermore, the circuit breaker assembly includes a plurality of circuit breakers, which are arranged at intervals, wherein one circuit breaker is arranged at the front end of the energy storage device, and the other circuit breakers are arranged at the front end of the corresponding power unit.

[0025] Compared with the prior art, the hydraulic steering gear emergency power supply system of the embodiment of the present invention has the following beneficial effects: (1) The embodiment of the present invention can realize redundant switching between power units through the configuration of at least two power units and multiple working modes of the control unit. When a power unit fails, the control unit can automatically detect and switch to other power units to continue working, thereby avoiding failure of the entire system due to a single point failure, and improving the fault tolerance and reliability of the system.

[0026] (2) The embodiment of the present invention is provided with an energy storage device, which replaces the emergency engine, and can perform emergency operations when the power is off, and can also effectively reduce the cost of setting up an emergency generator. In both normal working mode and fault working mode, the power supply can charge the energy storage device to full power, and will no longer charge the energy storage device after it is fully charged, thereby avoiding damage to the energy storage device due to overcharging, extending its service life, and ensuring that the energy storage device has electricity to supply the power unit when the power is off.

[0027] (3) This embodiment includes at least two power units. In the normal working mode, only one of the power units is enabled. When the power unit sends an error signal, the power unit that sends the error signal is shut down, and one of the remaining power units is driven to start, and the other power units are shut down. The redundant design of multiple power units ensures that the system can still operate stably when a single power unit fails.

[0028] (4) In normal working mode, to ensure the efficient operation of the system under normal circumstances, only one power unit needs to be started to reduce energy consumption. In fault working mode, once a power unit fails, the system can automatically identify and switch to another power unit, quickly resume operation, and avoid delays in manual intervention. In emergency working mode, when the main power supply is cut off, the energy storage device can seamlessly switch to emergency power supply mode, start the power unit, and ensure the normal operation of the system. The control unit can automatically switch the working mode according to the current situation without manual intervention. The power unit can send an error signal to the control unit when it fails. The control unit can make timely response adjustments based on the error signal, which significantly shortens the fault response time and improves the system's fault diagnosis capability and emergency handling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the prior art;

[0030] Figure 2 It is a schematic diagram of an embodiment of the present invention.

[0031] In the figure, 1, energy storage device; 11, energy storage device; 12, bidirectional inverter;

[0032] 2. Power unit; 21. Frequency converter; 22. Frequency conversion motor;

[0033] 3. First switch; 4. Second switch; 5. Third switch;

[0034] 6. Circuit breaker assembly; 61. Circuit breaker;

[0035] 7. AC power supply. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 2 As shown, a hydraulic steering gear emergency power supply system of a preferred embodiment of the present invention comprises a control unit, an energy storage device 1 and at least two power units 2; the energy storage device 1 and the at least two power units 2 are arranged at intervals, the energy storage device 1 and the at least two power units 2 are respectively powered by a power supply, the energy storage device 1 is electrically connected to one of the power units 2, the energy storage device 1 can drive the power unit 2 to start, the power unit 2 can send an error signal to the control unit in the event of a fault, the energy storage device 1 can be charged to full power when not fully charged, and the power is cut off after being fully charged, and the energy storage device 1 and the at least two power units 2 are respectively electrically connected to the control unit;

[0040] The hydraulic steering gear emergency power supply system has normal working mode, fault working mode and emergency working mode;

[0041] In the normal working mode, the control unit controls one of the power units 2 to start, and the other power units 2 to shut down;

[0042] When the control unit receives the error signal from the power unit 2, the emergency power supply system of the hydraulic steering gear switches to the fault working mode, the control unit shuts down the power unit 2 that sends the error signal, and controls any other power unit 2 to start;

[0043] When the power is cut off, the hydraulic steering gear emergency power supply system switches to the emergency working mode, and the energy storage device 1 drives the power unit 2 to start.

[0044] Based on the above scheme, the embodiment of the present invention can realize redundant switching between power units 2 through the configuration of at least two power units 2 and multiple working modes of the control unit. When a power unit 2 fails, the control unit can automatically detect and switch to other power units 2 to continue working, thereby avoiding failure of the entire system due to a single point failure, and improving the fault tolerance and reliability of the system. The embodiment of the present invention is provided with an energy storage device 1, which replaces the emergency engine, can perform emergency operations when the power is off, and can also effectively reduce the cost of setting up an emergency generator. In both normal working mode and fault working mode, the power supply can charge the energy storage device 1 to full power, and the energy storage device 1 is no longer charged after full power, avoiding damage to the energy storage device 1 caused by overcharging, extending its service life, and ensuring that the energy storage device 1 is powered when the power is off. The present embodiment includes at least two power units 2. In the normal working mode, only one of the power units 2 is enabled. When the power unit 2 sends an error signal, the power unit 2 that sends the error signal is turned off, and one of the remaining power units 2 is driven to start, and the other power units 2 are turned off. Through the redundant design of multiple power units 2, it is ensured that the system can still operate stably when a single power unit 2 fails. In the normal working mode, to ensure the efficient operation of the system under normal circumstances, only one power unit 2 needs to be started to reduce energy consumption. In the fault working mode, once a power unit 2 fails, the system can automatically identify and switch to another power unit 2, quickly resume operation, and avoid delays in manual intervention. In the emergency working mode, when the main power supply is cut off, the energy storage device 1 can seamlessly switch to the emergency power supply mode, start the power unit 2, and ensure the normal operation of the system. The control unit can automatically switch the working mode according to the current situation without manual intervention. The power unit 2 can send an error signal to the control unit when it fails. The control unit can make timely response adjustments based on the error signal, which significantly shortens the fault response time and improves the system's fault diagnosis capability and emergency handling efficiency.

[0045] Preferably, one of the power units 2 includes: a frequency converter 21 and a variable frequency motor 22, the frequency converter 21 is powered by an AC power supply 7, the variable frequency motor 22 is connected to the frequency converter 21, and the frequency converter 21 is electrically connected to the control unit. The frequency converter 21 can control the speed of opening or closing the variable frequency motor 22, and the frequency converter 21 can send a signal to the control unit whether the variable frequency motor 22 has an error; in the normal working mode, the control unit can control the frequency converter 21 to control the variable frequency motor 22 to turn on; when the control unit receives the error signal of the frequency converter 21, it switches to the fault working mode, controls the corresponding variable frequency motor 22 of the frequency converter 21 that sends the error signal to turn off, drives the frequency converter 21 in one of the remaining power units 2 to control the corresponding variable frequency motor 22 to turn on, and drives the frequency converters 21 in other power units 2 to control the corresponding variable frequency motors 22 to turn off.

[0046] Based on the above scheme, the speed of the variable frequency motor 22 is controlled by the frequency converter 21 to be fast or shut down, thereby realizing precise control of the power unit 2. The variable frequency speed regulation function can adjust the motor speed according to actual needs, avoiding energy waste in the traditional fixed speed operation mode, thereby improving the efficiency and energy saving effect of the system operation. Through the variable frequency speed regulation function, the system can flexibly adjust the motor output power according to the working conditions. For example, under normal circumstances, the variable frequency motor 22 can run at low power to save energy; under emergency or high load conditions, the variable frequency motor 22 can quickly increase the speed to provide sufficient power, so as to better adapt to different working scenarios.

[0047] The variable frequency motor 22 has many advantages over the three-phase asynchronous motor. The three-phase asynchronous motor requires a higher starting current, which is 5 to 7 times the normal operating current. In order to compensate for this, it is usually necessary to add an additional high-power inverter to convert the DC power of the battery into the AC power required by the motor. However, this approach will bring some problems: high-power inverters and related equipment take up more space and are heavier, which is not conducive to the design and performance of ships, especially high-speed ships. The power of the inverter needs to be 5 to 7 times greater than the rated power of the motor, resulting in low energy utilization efficiency of the system. After using the variable frequency motor 22, it is possible to avoid using a larger power and volume inverter, which reduces the weight of the ship and reduces the cost.

[0048] Preferably, the energy storage device 1 includes an energy storage device 11 and a bidirectional inverter 12, the bidirectional inverter 12 is powered by an AC power supply 7, the energy storage device 11 is connected to the bidirectional inverter 12, the bidirectional inverter 12 is connected to a frequency converter 21 in one of the power units through a first circuit, the bidirectional inverter 12 is electrically connected to the control unit and can convert DC power into AC power, and can also convert AC power into DC power; in a normal working mode, the bidirectional inverter 12 converts AC power into DC power, and charges the energy storage device 11 to full power when it is not fully charged through an AC power supply, and cuts off power after it is fully charged; in an emergency working mode, the energy storage device 11 releases DC power, and converts DC power into AC power through the bidirectional inverter 12 to drive the frequency converter 21 connected to the bidirectional inverter 12, and the frequency converter 21 controls the variable frequency motor 22 to start.

[0049] Based on the above scheme: through the design of the bidirectional inverter 12, the energy storage device 1 can convert the electric energy of the AC power supply 7 into DC power for charging in the normal working mode, and convert the DC power of the energy storage device 11 into AC power in the emergency working mode to provide power support for the frequency converter 21 and the variable frequency motor 22. The bidirectional conversion function improves the applicability and flexibility of the energy storage device 1, and can meet the diverse power supply needs. The energy storage device 1 ensures that in the case of power failure, the hydraulic steering gear is driven to operate through the discharge of the energy storage device 11. The power storage capacity of the energy storage device 11 combined with the output conversion function of the bidirectional inverter 12 provides a reliable guarantee for the normal operation of the steering gear system in an emergency situation, ensuring that the power supply of the system is uninterrupted at critical moments. The interval setting design of the energy storage device 11 and the bidirectional inverter 12 makes the system layout more compact, which helps to optimize the space allocation between ship equipment. At the same time, due to the reasons explained above, the weight of the bidirectional inverter 12 is relatively small, which reduces the weight of the system and improves the economy and flexibility of ship operation.

[0050] Preferably, the energy storage device 1 also includes a first switch 3, which is connected to the front end of the bidirectional inverter 12. The first switch 3 can control the connection and disconnection between the bidirectional inverter 12 and the AC power supply 7, and the first switch 3 is electrically connected to the control unit; the hydraulic steering gear emergency power supply system also includes a second switch 4, which can control the connection and disconnection between the power unit 2 connected to the bidirectional inverter 12 and the AC power supply 7, and the second switch 4 is electrically connected to the control unit; the bidirectional inverter 12 is connected to the frequency converter 21 in one of the power units through the first circuit, and the first circuit is provided with a third switch 5, which can control the connection and disconnection between the bidirectional inverter 12 and the variable frequency motor 22, and the third switch 5 is electrically connected to the control unit; in the normal working mode, the third switch 5 is disconnected, and the first switch 3 and the second switch 4 are turned on; in the emergency working mode, the third switch 5 is turned on, and the first switch 3 and the second switch 4 are turned off.

[0051] Based on the above scheme, by setting the first switch 3, the second switch 4 and the third switch 5 and electrically connecting them to the control unit, the system can flexibly control the connection or disconnection between the bidirectional inverter 12 and the AC power supply 7, the power unit 2 and the variable frequency motor 22 according to the normal working mode or the emergency working mode, thereby ensuring the rapid switching and precise control of the circuit state in each mode.

[0052] In the normal working mode, the third switch 5 is disconnected to ensure that the circuit between the bidirectional inverter 12 and the variable frequency motor 22 is disconnected, avoiding unnecessary power flow and potential risks; in the emergency working mode, the first switch 3 and the second switch 4 are closed, disconnecting the connection with the AC power supply 7, and at the same time, the third switch 5 is used to ensure that the emergency power is only supplied to the variable frequency motor 22, effectively avoiding the occurrence of power conflicts or reverse power supply to the power supply 7 or short circuit. The flexible configuration of the switch enables the system to switch the energy transmission path according to actual needs. For example, in the normal mode, the bidirectional inverter 12 can be connected to the AC power supply 7 by turning on the first switch 3, thereby charging the energy storage device 11; in the emergency mode, the third switch 5 is turned on to drive the variable frequency motor 22 to ensure the efficient use of the energy of the energy storage device 11. Through the control of the third switch 5, the bidirectional inverter 12 can quickly switch to the emergency power supply state, directly drive the variable frequency motor 22 with the energy of the energy storage device 11 through the frequency converter 21, avoid the complex power transmission path, and improve the response speed and stability of the emergency power supply.

[0053] Preferably, the first switch 3, the second switch 4 and the third switch 5 are AC contactors. The AC contactor has good electrical and mechanical properties, can realize stable and reliable circuit switching, and helps to improve the operational reliability of the equipment. The AC contactor can effectively suppress the generation of arcs during the switching process, thereby reducing the loss of electrical equipment and extending the service life, and is particularly suitable for high-frequency operation scenarios. The AC contactor can be remotely controlled through a simple control loop, greatly improving the automation level and operational convenience of the system. The structure of the AC contactor is relatively simple, the parts are highly versatile, the maintenance is convenient and the cost is low, which helps to reduce the operating cost of the equipment. The AC contactor is generally equipped with overload protection and short-circuit protection functions, which can effectively improve the safety of the electrical system and avoid equipment damage and personal injury. The AC contactor can be widely used in a variety of load types, such as motors, heating equipment or lighting loads, and has strong versatility and adaptability.

[0054] Preferably, the hydraulic steering gear emergency power supply system further comprises a circuit breaker assembly 6, which is connected to the front end of the energy storage device 1 and at least two power units 2, and can connect or disconnect the energy storage device 1 and at least two power units 2 with the power supply. The circuit breaker assembly 6 can quickly cut off the power supply in the event of overload to a certain power, short circuit or other abnormal conditions to prevent the expansion of the fault, thereby effectively protecting the energy storage device 1, the power unit 2 and related electrical equipment, and improving the overall safety of the system.

[0055] Preferably, the circuit breaker assembly 6 includes a plurality of circuit breakers 61, and the plurality of circuit breakers 61 are arranged at intervals, wherein one circuit breaker 61 is arranged at the front end of the energy storage device 1, and the other circuit breakers 61 are arranged at the front end of the corresponding power unit 2. The interval arrangement of the plurality of circuit breakers 61 enables each power unit 2 to independently connect or disconnect the power supply, thereby realizing flexible circuit management. During maintenance, the power supply of a certain power unit 2 can be cut off individually by disconnecting a certain circuit breaker 61, without affecting the normal operation of other power units 2, thereby improving the flexibility and maintainability of system operation. Setting a circuit breaker 61 at the front end of the energy storage device 1 can provide overall protection for the entire energy storage device 1, and prevent the energy storage device 1 from being damaged due to short circuit or overload. The other circuit breakers 61 are respectively arranged at the front end of each power unit 2, and each power unit 2 is independently protected to prevent the failure of a single power unit 2 from spreading to other units or the energy storage device 1. The hierarchical protection design makes the system safer and more reliable, and helps to reduce the scope of influence of the failure.

[0056] In summary, as a preferred solution, the present invention selects two power units 2, and the working process thereof is as follows: in the normal working mode, the second switch 4 is connected to the AC power supply 7, the third switch 5 is disconnected, the first switch 3 is connected to the bidirectional inverter 12 and the AC power supply 7, the bidirectional inverter 12 converts the AC power into DC power, and the energy storage device 11 is charged to full power when it is not fully charged through the AC power supply. After the energy storage device 11 is fully charged, the energy storage device 11 is no longer charged, and the control unit operates one of the power units 2 to work, and the corresponding frequency converter 21 controls the power output of the variable frequency motor 22;

[0057] When the control unit receives the error signal of the power unit 2, it switches to the fault working mode, turns off the variable frequency motor 22 that sends the error signal through the corresponding frequency converter 21, connects the bidirectional inverter 12 with the AC power supply 7 with the first switch 3, connects the second switch 4 with the AC power supply 7, and disconnects the third switch 5. The control unit starts one of the remaining power units, and the corresponding frequency converter 21 controls the power output of the variable frequency motor 22;

[0058] When the AC power supply 7 is cut off, it switches to the emergency working mode, the first switch 3 is disconnected, the second switch 4 is disconnected, the third switch 5 is connected, the energy storage device 11 releases DC power, and the DC power is converted into AC power through the bidirectional inverter 12 to drive the frequency converter 21 connected to the bidirectional inverter 12, and the frequency converter 21 controls the variable frequency motor 22 to start; when the AC power supply 7 is restored, it switches to the normal working mode / fault working mode.

[0059] In summary, the embodiment of the present invention provides a hydraulic steering gear emergency power supply system, and the embodiment of the present invention can realize redundant switching between power units 2 through the configuration of at least two power units 2 and multiple working modes of the control unit. When a power unit 2 fails, the control unit can automatically detect and switch to other power units 2 to continue working, thereby avoiding the failure of the entire system due to a single point failure, and improving the fault tolerance and reliability of the system. The embodiment of the present invention is provided with an energy storage device 1, which replaces the emergency engine, can perform emergency operations when the power is off, and can also effectively reduce the cost of setting up an emergency generator. In both normal working mode and fault working mode, the power supply can charge the energy storage device 1 to full power, and the energy storage device 1 is no longer charged after full power, avoiding damage to the energy storage device 1 caused by overcharging, extending its service life, and ensuring that the energy storage device 1 is powered when the power is off. At least two power units 2 are included in this embodiment. In the normal working mode, only one of the power units 2 is enabled. When the power unit 2 sends an error signal, the power unit 2 that sends the error signal is turned off, and one of the remaining power units is driven to start, and the other power units 2 are turned off. Through the redundant design of multiple power units 2, it is ensured that the system can still operate stably when a single power unit 2 fails. In the normal working mode, to ensure the efficient operation of the system under normal circumstances, only one power unit 2 needs to be started to reduce energy consumption. In the fault working mode, once a power unit 2 fails, the system can automatically identify and switch to another power unit 2, quickly resume operation, and avoid delays in manual intervention. In the emergency working mode, when the main power supply is cut off, the energy storage device 1 can seamlessly switch to the emergency power supply mode, start the power unit 2, and ensure the normal operation of the system. The control unit can automatically switch the working mode according to the current situation without manual intervention. The power unit 2 can send an error signal to the control unit when it fails. The control unit can make timely response adjustments based on the error signal, which significantly shortens the fault response time and improves the system's fault diagnosis capability and emergency handling efficiency.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic steering gear emergency power supply system, characterized in that: It includes a control unit, an energy storage device and at least two power units; The energy storage device and at least two of the power units are arranged at intervals, the energy storage device and the at least two of the power units are respectively powered by a power supply, the energy storage device is electrically connected to one of the power units, the energy storage device can drive the power unit to start, the power unit can send an error signal to the control unit in the event of a fault, the energy storage device can be charged to full power when not fully charged, and the power is cut off after being fully charged, and the energy storage device and at least two of the power units are respectively electrically connected to the control unit; The hydraulic steering gear emergency power supply system has a normal working mode, a fault working mode and an emergency working mode; In the normal working mode, the control unit controls one of the power units to start and the other power units to shut down; When the control unit receives the error signal of the power unit, the hydraulic steering gear emergency power supply system switches to the fault working mode, the control unit shuts down the power unit that sends the error signal, and controls any other power unit to start; When the power is cut off, the hydraulic steering gear emergency power supply system switches to the emergency working mode, and the control unit controls the energy storage device to drive the power unit to start.

2. The hydraulic steering gear emergency power supply system according to claim 1, characterized in that: One of the power units includes: a frequency converter and a variable frequency motor, the frequency converter is powered by an AC power supply, the variable frequency motor is connected to the frequency converter, the frequency converter is electrically connected to the control unit, the frequency converter can control the speed of the variable frequency motor to start or stop, and the frequency converter can send a signal to the control unit to indicate whether the variable frequency motor has an error; In the normal working mode, the control unit can control the frequency converter to control the variable frequency motor to start; When the control unit receives the error signal from the frequency converter, it switches to the fault working mode, controls the corresponding frequency converter that sends the error signal to turn off the corresponding frequency converter motor, drives the frequency converter in one of the remaining power units to control the corresponding frequency converter motor to turn on, and drives the frequency converters in other power units to control the corresponding frequency converter motors to turn off.

3. The hydraulic steering gear emergency power supply system according to claim 2, characterized in that: The energy storage device includes an energy storage device and a bidirectional inverter, the bidirectional inverter is powered by an AC power supply, the energy storage device is connected to the bidirectional inverter, the bidirectional inverter is connected to the frequency converter through a first circuit, the bidirectional inverter is electrically connected to the control unit and can convert direct current into alternating current, and can also convert alternating current into direct current; In the normal working mode, the bidirectional inverter converts AC power into DC power, and charges the energy storage device to be fully charged through the AC power supply when the energy storage device is not fully charged, and cuts off the power after the energy storage device is fully charged; In the emergency working mode, the energy storage device releases direct current, which is converted into alternating current through the bidirectional inverter to drive the frequency converter connected to the bidirectional inverter, and the frequency converter controls the variable frequency motor to start.

4. The hydraulic steering gear emergency power supply system according to claim 3, characterized in that: The energy storage device also includes a first switch, which is connected to the front end of the bidirectional inverter. The first switch can control the connection and disconnection between the bidirectional inverter and the AC power supply, and the first switch is electrically connected to the control unit.

5. The hydraulic steering gear emergency power supply system according to claim 4, characterized in that: It also includes a second switch, which can control the connection or disconnection between the power units connected to the bidirectional inverter, and the second switch is electrically connected to the control unit.

6. The hydraulic steering gear emergency power supply system according to claim 5, characterized in that: The bidirectional inverter is connected to the frequency converter in one of the power units through a first circuit, a third switch is provided on the first circuit, the third switch can control the connection and disconnection between the bidirectional inverter and the variable frequency motor, and the third switch is electrically connected to the control unit; In the normal working mode, the third switch is turned off, and the first switch and the second switch are turned on; In the emergency working mode, the third switch is turned on, and the first switch and the second switch are turned off.

7. The hydraulic steering gear emergency power supply system according to claim 6, characterized in that: The first switch, the second switch and the third switch are AC contactors.

8. The hydraulic steering gear emergency power supply system according to claim 1, characterized in that: It also includes a circuit breaker assembly, which is connected to the front ends of the energy storage device and at least two of the power units and can connect or disconnect the energy storage device and at least two of the power units with the power source.

9. The hydraulic steering gear emergency power supply system according to claim 8, characterized in that: The circuit breaker assembly includes a plurality of circuit breakers, which are arranged at intervals, wherein one of the circuit breakers is arranged at the front end of the energy storage device, and the other circuit breakers are arranged at the front end of the corresponding power unit.

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