Non-similar redundancy electrically-driven hydraulic energy device and control method

Abstract

According to the dissimilar redundancy electrically-driven hydraulic energy device and the control method, two kinds of servo motor pumps are adopted, and high-power steering and low-power mute working condition steering are met respectively. A plurality of hydraulic pulsation silencers are connected in series in a main oil way to weaken vibration noise in the flowing process of high-pressure oil, a hydraulic hose is adopted for connection in the main oil way, vibration energy of output hydraulic oil is further attenuated, and meanwhile a double-layer vibration isolator is arranged to further reduce the magnitude of the vibration noise transmitted to a ship body.

Description

Technical Field

[0001] The invention relates to a non-similar redundant electric drive hydraulic energy device and a control method, belonging to the technical field of ship control equipment. Background Art

[0002] The ship steering device is used to control the swing direction and speed of the ship's rudder, which is crucial to the navigation safety of the ship. With the development of equipment technology, higher requirements are placed on the control performance, reliability, and low noise of the ship steering device. Traditional ship steering devices usually use a valve control solution that uses a centralized hydraulic station to power the hydraulic cylinder. The control performance is poor, the working noise is loud, and long hydraulic pipelines need to be laid between the hydraulic station and the hydraulic cylinder. The installation and maintenance are complicated and it is easy to leak oil and pollute the environment. The servo valve is costly, has large energy loss, and poor anti-pollution ability. In recent years, some patents have also disclosed electromechanical static pressure control solutions for ship steering gears, which solve the above-mentioned problems, but cannot meet the higher requirements of low-noise working conditions of underwater ships.

[0003] Chinese patent CN108869437B discloses an electromechanical hydrostatic control unit for ships, which is used to control the operation of ship steering gear. This invention patent includes two identical EHA integrated valve groups and manual emergency valve groups, which control two groups of hydraulic cylinders and have a three-redundant configuration. The manual emergency valve group can also replenish oil for the EHA integrated valve group. It reduces the maintenance work of the crew and improves the reliability of the system. The EHA integrated valve group uses a high-pressure and low-noise servo motor pump and installs shock-absorbing pads at the installation feet to achieve a certain low-noise and low-vibration effect. However, the invention patent system is complex and requires additional configuration of a more complex control system. It is more suitable for large manned ships and is not suitable for underwater ships with higher requirements for quietness. Summary of the invention

[0004] The technical problem solved by the present invention is: in view of the problems existing in the current prior art, such as the control drive system being complex, occupying a large space, having no integrated control and failing to meet the requirements of both low noise in small working conditions and high power and high flow conditions, a non-similar redundant electric drive hydraulic energy device and control method are proposed.

[0005] The present invention solves the above technical problems by the following technical solutions:

[0006] A non-similar redundant electrically driven hydraulic energy device comprises a box assembly, a control driver, an integrated valve block assembly, a primary vibration isolator, a secondary vibration isolator and a mounting base, wherein:

[0007] The control driver is installed at the top of the inner side of the box assembly to control the integrated valve block assembly. The integrated valve block assembly is connected to the bottom of the inner side of the box assembly through a primary vibration isolator. The box assembly is connected to the mounting base through a secondary vibration isolator. The mounting base is set on the test ground. The box assembly and the integrated valve block assembly achieve vibration level reduction through the primary vibration isolator and the secondary vibration isolator.

[0008] The integrated valve block assembly includes a first motor pump, a second motor pump, a fixed-frequency pressure pulsation muffler, a broad-spectrum pressure pulsation attenuator, a transient pressure pulsation absorber, a solenoid valve, and a two-way oil filter assembly, wherein:

[0009] The first motor pump is arranged on the inner side of the box structure, and the second motor pump is arranged at the center position of the inner side of the box structure, and both are driven by the control driver to rotate; the first motor pump and the second motor pump are both controlled by solenoid valves, and are connected to the external main oil circuit interface under different working modes. A two-way oil filter assembly is arranged on the connection passage between the first motor pump, the second motor pump and the external main oil circuit interface; broad-spectrum pressure pulsation attenuators are arranged on both sides of the second motor pump for pressure attenuation; the two broad-spectrum pressure pulsation attenuators are connected to a transient pressure pulsation absorber on the side close to the first motor pump, and work together with the broad-spectrum pressure pulsation attenuator installed on the same side to absorb pressure shocks; the two broad-spectrum pressure pulsation attenuators are connected to a fixed-frequency pressure pulsation muffler on the side away from the first motor pump, which is used to eliminate the pressure pulsation of the motor pump.

[0010] The first motor pump includes a servo motor and a plunger pump, and the rotation of the servo motor drives the plunger pump to achieve full-power steering; the second motor pump includes a servo motor and a screw pump, and the rotation of the servo motor drives the screw pump to achieve low-power steering; the solenoid valve adopts a direct-acting solenoid valve, which is used to control the action of the first motor pump and the second motor pump, and to isolate the first motor pump and the second motor pump.

[0011] The fixed-frequency pressure pulsation muffler is used to eliminate the pressure pulsation generated by the first motor pump and the second motor pump. The broad-spectrum pressure pulsation attenuator is filled with a gradient preset gas pressure to broaden the matching operating range of the fixed-frequency pressure pulsation muffler; the transient pressure pulsation absorber absorbs the transient pressure shock generated during the start and stop of the first motor pump and the second motor pump and reduces transient vibration; the two-way oil filter assembly cleans the hydraulic medium after the first motor pump and the second motor pump are connected to the main oil circuit interface, and is replaced or disassembled according to the connection status of the first motor pump, the second motor pump and the main oil circuit interface.

[0012] The fixed-frequency pressure pulsation muffler, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber are arranged in series in the integrated valve block assembly through cables to reduce the pressure pulsation of the hydraulic oil in the main oil circuit and reduce vibration noise.

[0013] The integrated valve block assembly also includes a one-way valve, a high-pressure safety valve, a booster tank, a filling valve, and a manual bypass valve, wherein:

[0014] The one-way valve and the high-pressure safety valve are both arranged on the interface between the first motor pump and the second motor pump and the main oil circuit. The one-way valve is used to replenish oil for the servo motor to prevent air suction, and the high-pressure safety valve is used to prevent component damage; the boost oil tank is arranged at the connection point of the first motor pump and the second motor pump, and the oil replenishment is controlled by the one-way valve; the filling valve is arranged on the boost oil tank, which is used for manual vacuum extraction and filling of liquid medium; the manual bypass valve is arranged at the boost oil tank port.

[0015] A control method according to an electrically driven hydraulic energy device, comprising:

[0016] Confirm the working mode of the energy device and the corresponding control instructions;

[0017] According to the working mode and control instructions, the driving controller is operated to power on the first motor pump or the second motor pump through the solenoid valve, and the first motor pump or the second motor pump is connected to the main oil circuit interface and rotates at a certain speed under the control of the driving controller;

[0018] When the control instruction is the piston rod extension instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the two-way oil filter assembly, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to extend; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, and the solenoid valve in sequence;

[0019] The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

[0020] When the control instruction is a piston rod retraction instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to retract; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, the two-way oil filter assembly, and the solenoid valve in sequence;

[0021] The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

[0022] The working modes include a high-power steering mode and a low-noise working mode;

[0023] In high-power steering mode, only the second motor pump is in operation; in low-noise working mode, only the first motor pump is in operation.

[0024] The advantages of the present invention compared with the prior art are:

[0025] (1) The present invention provides a non-similar redundant electric drive hydraulic energy device and control method, which uses a plunger servo motor pump and a screw servo motor pump to form a redundant system, and controls the operation switching of the two motor pumps through an electromagnetic valve, wherein the plunger servo motor pump mainly realizes high-power steering under high pressure and large flow, and the screw servo motor pump mainly realizes low-power silent steering. The combination of the two servo motor pump solutions solves the contradiction between low noise under small working conditions and high power and large flow, and has high reliability;

[0026] (2) The present invention adopts a configuration of multiple hydraulic pulsation silencers + double-layer vibration isolators to achieve the best silent working effect. The combined use of the three silencers can make the energy device achieve excellent silent effect; among them, the fixed-frequency pressure pulsation silencer is specially configured for low-noise working conditions, and combined with the use of screw servo motor pumps, the energy device has a better silent effect in low-noise operation. At the same time, two layers of vibration isolators are matched between the integrated valve block assembly and the box assembly, and between the box assembly and the ship installation base to further reduce the vibration noise level transmitted to the hull by the integrated valve block assembly;

[0027] (3) The present invention adopts an integrated miniaturized structural design and a modular design. Each component is adapted to the internal space layout and has a compact structure. The top of the box has an oil port for connecting the hydraulic cylinder and an electrical connector for electrical connection with the steering instrument, which facilitates mechanical and electrical connection operations. Compared with the control unit described in patent CN108869437B, the complex external cables between the control cabinet and the control cabinet are eliminated, reducing the installation and maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural diagram of the energy device provided by the present invention;

[0029] Figure 2 A structural diagram of the integrated valve block assembly provided by the present invention;

[0030] Figure 3 The hydraulic principle diagram provided by the present invention; DETAILED DESCRIPTION

[0031] A non-similar redundant electric drive hydraulic energy device and control method, using two servo motor pumps to meet high-power steering and low-power silent steering conditions respectively. A variety of hydraulic pulsation silencers are connected in series in the main oil circuit to reduce the vibration noise during the flow of high-pressure oil, and hydraulic hoses are used internally to further attenuate the vibration energy of the output hydraulic oil. At the same time, double-layer vibration isolators are configured to further reduce the vibration noise level transmitted to the hull.

[0032] A non-similar redundant electric drive hydraulic energy device comprises a box assembly, a control driver, an integrated valve block assembly, a primary vibration isolator, a secondary vibration isolator and a mounting base, wherein:

[0033] The control driver is installed at the top of the inner side of the box assembly to control the integrated valve block assembly. The integrated valve block assembly is connected to the bottom of the inner side of the box assembly through a primary vibration isolator. The box assembly is connected to the mounting base through a secondary vibration isolator. The mounting base is set on the test ground. The box assembly and the integrated valve block assembly achieve vibration level reduction through the primary vibration isolator and the secondary vibration isolator.

[0034] The integrated valve block assembly includes a first motor pump, a second motor pump, a fixed-frequency pressure pulsation muffler, a broad-spectrum pressure pulsation attenuator, a transient pressure pulsation absorber, a solenoid valve, and a two-way oil filter assembly, wherein:

[0035] The first motor pump is arranged on the inner side of the box structure, and the second motor pump is arranged at the center position of the inner side of the box structure, and both are driven by the control driver to rotate; the first motor pump and the second motor pump are both controlled by solenoid valves, and are connected to the external main oil circuit interface under different working modes. A two-way oil filter assembly is arranged on the connection passage between the first motor pump, the second motor pump and the external main oil circuit interface; broad-spectrum pressure pulsation attenuators are arranged on both sides of the second motor pump for pressure attenuation; the two broad-spectrum pressure pulsation attenuators are connected to a transient pressure pulsation absorber on the side close to the first motor pump, and work together with the broad-spectrum pressure pulsation attenuator installed on the same side to absorb pressure shocks; the two broad-spectrum pressure pulsation attenuators are connected to a fixed-frequency pressure pulsation muffler on the side away from the first motor pump, which is used to eliminate the pressure pulsation of the motor pump.

[0036] The first motor pump includes a servo motor and a plunger pump, and the rotation of the servo motor drives the plunger pump to achieve full-power steering; the second motor pump includes a servo motor and a screw pump, and the rotation of the servo motor drives the screw pump to achieve low-power steering; the solenoid valve adopts a direct-acting solenoid valve, which is used to control the action of the first motor pump and the second motor pump, and to isolate the first motor pump and the second motor pump.

[0037] The fixed-frequency pressure pulsation muffler is used to eliminate the pressure pulsation generated by the first motor pump and the second motor pump. The broad-spectrum pressure pulsation attenuator widens the matching operating range of the fixed-frequency pressure pulsation muffler by filling a gradient preset gas pressure; the transient pressure pulsation absorber absorbs the transient pressure shock generated during the start and stop of the first motor pump and the second motor pump and reduces transient vibration; the two-way oil filter assembly cleans the hydraulic medium after the first motor pump and the second motor pump are connected to the main oil circuit interface, and is replaced or disassembled according to the connection status of the first motor pump, the second motor pump and the main oil circuit interface.

[0038] The fixed-frequency pressure pulsation muffler, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber are arranged in series in the integrated valve block assembly through cables to reduce the pressure pulsation of the hydraulic oil in the main oil circuit and reduce vibration noise.

[0039] The integrated valve block assembly also includes a one-way valve, a high-pressure safety valve, a pressurized oil tank, a filling valve, and a manual bypass valve, among which:

[0040] The one-way valve and the high-pressure safety valve are both arranged on the interface between the first motor pump and the second motor pump and the main oil circuit. The one-way valve is used to replenish oil for the servo motor to prevent air suction, and the high-pressure safety valve is used to prevent component damage; the boost oil tank is arranged at the connection point of the first motor pump and the second motor pump, and the oil replenishment is controlled by the one-way valve; the filling valve is arranged on the boost oil tank, which is used for manual vacuum extraction and filling of liquid medium; the manual bypass valve is arranged at the boost oil tank port.

[0041] The control method of the electric drive hydraulic energy device has the following specific process:

[0042] Confirm the working mode of the energy device and the corresponding control instructions;

[0043] According to the working mode and control instructions, the driving controller is operated to power on the first motor pump or the second motor pump through the solenoid valve, and the first motor pump or the second motor pump is connected to the main oil circuit interface and rotates at a certain speed under the control of the driving controller;

[0044] When the control instruction is the piston rod extension instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the two-way oil filter assembly, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to extend; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, and the solenoid valve in sequence;

[0045] The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

[0046] When the control instruction is a piston rod retraction instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to retract; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, the two-way oil filter assembly, and the solenoid valve in sequence;

[0047] The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

[0048] The working modes include high-power steering mode and low-noise working mode;

[0049] In high-power steering mode, only the second motor pump is in operation; in low-noise working mode, only the first motor pump is in operation.

[0050] The following is further described in conjunction with the accompanying drawings and preferred embodiments of the specification:

[0051] In the current embodiment, the structure diagram of the non-similar redundant electric drive hydraulic energy device is as follows: Figure 1 As shown. The energy device is designed as a regular box-type structure, mainly composed of three parts: box assembly 1, control driver 2 and integrated valve block assembly 3, and also includes a primary vibration isolator 4 and a secondary vibration isolator 5. The control driver 2 is installed on the top of the box assembly, the integrated valve block assembly 3 is connected to the bottom of the box through the primary vibration isolator 4, and the box assembly 1 is connected to the mounting base through the secondary vibration isolator 5. The combined use of the two-stage vibration isolators can effectively reduce the vibration level.

[0052] The structure diagram of the integrated valve block assembly is as follows: Figure 2 As shown, the motor pump A (6), the motor pump B (7), the fixed-frequency pressure pulsation muffler 8, the broad-spectrum pressure pulsation attenuator 9, the transient pressure pulsation absorber 10, the solenoid valve 11, the two-way oil filter assembly 12, etc. are all installed on the valve block. Each component is designed according to the spatial adaptability to make full use of the limited space, make the structure more compact, and facilitate replacement and maintenance. The top of the box body is provided with a hydraulic cylinder connection oil port and an electrical interface connected to the steering instrument, which is convenient for mechanical and electrical connection operations.

[0053] The hydraulic principle diagram of the non-similar redundant electric drive hydraulic energy device in this embodiment is as follows: Figure 3As shown, it includes a motor pump A (1), a motor pump B (2), a one-way valve 3 (3.1, 3.2, 3.3, 3.4), a high-pressure safety valve 4 (4.1, 4.1, 4.3, 4.4, 4.5, 4.6), a solenoid valve 5 (5.1, 5.2, 5.3, 5.4), a fixed-frequency pressure pulsation muffler 6 (6.1, 6.2), a booster tank 7, a filling valve 8, a manual bypass valve 9, a differential pressure sensor 10, a two-way oil filter assembly 11, a broad-spectrum pressure pulsation attenuator 12 (12.1, 12.2), a transient pressure pulsation absorber 13 (13.1, 13.2), and a control driver 14. Servo motor pump A is an integrated motor pump using servo motor + plunger pump. The plunger pump has the working characteristics of high pressure and high speed, and can realize full-power steering with high pressure and large flow. Servo motor pump B is an integrated motor pump using servo motor + screw pump. The screw pump has the working characteristics of low vibration and noise, and can realize low-noise steering under small working conditions. The two motor pumps do not work at the same time, and the working and isolation states of the two are controlled by the direct-acting solenoid valve 5. When working, the permanent magnet synchronous motor drives the quantitative hydraulic pump to rotate, and changes the direction and flow of the pump output flow by changing the direction and speed of the servo motor, thereby changing the movement direction and speed of the hydraulic cylinder. The pressure on one side of the system is equal to the replenishing pressure, and the pressure on the other side is determined by the load. The fixed-frequency pressure pulsation muffler 6 in the main oil circuit can eliminate the pressure pulsation generated by the main characteristic frequency of the pump source; the broad-spectrum pressure pulsation attenuator 12 can broaden the matching working condition range of the muffler by filling the gradient gas pressure, and realize the coverage of the silent working condition; the transient pressure pulsation absorber 13 can absorb the transient pressure shock generated by the start-stop switching and reduce the transient vibration. The one-way valve 3 is used to replenish oil in the servo motor pump to prevent air from being sucked in. The high-pressure safety valve 4 can ensure that the hydraulic components are not damaged by abnormal pressure shocks in the system. The two-way filter assembly 11 can ensure the cleanliness of the hydraulic medium. The two-way oil filter assembly is designed as a separate module for easy disassembly and replacement. The booster tank 7 replenishes oil to the low-pressure circuit through the one-way valve to compensate for other leakages in the hydraulic pump and the system, and to ensure that the system's low-pressure circuit has an appropriate pressure value to prevent cavitation and air from infiltrating the system. The filling valve 8 is used to vacuum the energy device and fill it with hydraulic oil. The manual bypass valve 9 is used to communicate the two chambers of the motor pump when the system is vacuumed and filled. The control driver 14 is used to receive instructions and then control the operation of the motor pump.

[0054] The specific working process is as follows:

[0055] (1) High power steering mode

[0056] When the console sends an extension command to the drive controller 14, the solenoid valves 5.1 and 5.2 are powered on, and the motor pump A

[0057] (1) Connected to the main oil circuit. The motor pump A (1) rotates at a certain speed under the control of the driver. The pumped pressure oil passes through the solenoid valve 5.1, the two-way oil filter assembly 11, the broad-spectrum pressure pulsation attenuator 12.1, and the transient pressure pulsation absorber 13.1 in turn into the upper chamber of the hydraulic cylinder, pushing the piston rod out; the low-pressure oil in the lower chamber of the hydraulic cylinder passes through the transient pressure pulsation absorber 13.2, the broad-spectrum pressure pulsation attenuator 12.2, and the solenoid valve 5.2 in turn and flows back to the motor pump A (1) oil suction chamber. The displacement sensor on the hydraulic cylinder feeds back the position signal to the controller in real time. When the piston rod is in place, the motor pump A (1) stops rotating, and the solenoid valves 5.1 and 5.2 are both de-energized.

[0058] When the console sends a retract command to the drive controller 14, the solenoid valves 5.1 and 5.2 are powered on, and the motor pump A (1) is connected to the main oil circuit. Driven by the control driver, the motor pump A (1) rotates at a certain speed, and the pumped pressure oil passes through the solenoid valve 5.2, the broad-spectrum pressure pulsation attenuator 12.2, and the transient pressure pulsation absorber 13.2 in turn into the lower chamber of the hydraulic cylinder, pushing the piston rod to retract; the low-pressure oil in the upper chamber of the hydraulic cylinder passes through the transient pressure pulsation absorber 13.1, the broad-spectrum pressure pulsation attenuator 12.1, the two-way oil filter assembly 11, and the solenoid valve 5.1 in turn and flows back to the motor pump A (1) suction chamber. The displacement sensor on the hydraulic cylinder feeds back the position signal to the controller in real time. When the piston rod is in place, the motor pump A (1) stops, and the solenoid valves 5.1 and 5.2 are both de-energized.

[0059] (2) Low noise working mode

[0060] When the control panel sends an extension command to the drive controller 14, the solenoid valves 5.3 and 5.4 are powered on, and the motor pump B (2) is connected to the main oil circuit. Driven by the control driver, the motor pump B (2) rotates at a certain speed, and the pumped pressure oil passes through the fixed-frequency pressure pulsation muffler 6.1, the solenoid valve 5.3, the two-way oil filter assembly 11, the broad-spectrum pressure pulsation attenuator 12.1, and the transient pressure pulsation absorber 13.1 in turn to enter the upper chamber of the hydraulic cylinder, pushing the piston rod to extend; the low-pressure oil in the lower chamber of the hydraulic cylinder passes through the transient pressure pulsation absorber 13.2, the broad-spectrum pressure pulsation attenuator 12.2, the solenoid valve 5.4, and the fixed-frequency pressure pulsation muffler 6.2 in turn to flow back to the motor pump B (2) oil suction chamber. The displacement sensor on the hydraulic cylinder feeds back the position signal to the controller in real time. When the piston rod is in place, the motor pump B (2) stops, and the solenoid valves 4.3 and 4.4 are both de-energized.

[0061] When the console sends a retract command to the drive controller 14, the solenoid valves 5.3 and 5.4 are powered on, and the motor pump B (2) is connected to the main oil circuit. Driven by the control driver, the motor pump B (2) rotates at a certain speed, and the pumped pressure oil passes through the fixed-frequency pressure pulsation muffler 6.2, the solenoid valve 5.4, the broad-spectrum pressure pulsation attenuator 12.2, and the transient pressure pulsation absorber 13.2 in turn into the lower chamber of the hydraulic cylinder, pushing the piston rod to retract; the low-pressure oil in the upper chamber of the hydraulic cylinder passes through the transient pressure pulsation absorber 13.1, the broad-spectrum pressure pulsation attenuator 12.1, the two-way oil filter assembly 11, the solenoid valve 5.3, and the fixed-frequency pressure pulsation muffler 6.1 in turn and flows back to the oil suction chamber of the motor pump B (2). The displacement sensor on the hydraulic cylinder feeds back the position signal to the controller in real time. When the piston rod is in place, the motor pump B (2) stops, and the solenoid valves 5.3 and 5.4 are both de-energized.

[0062] In this embodiment, the main invention points are:

[0063] (1) A plunger servo motor pump and a screw servo motor pump are combined to form a redundant system, and the solenoid valve is used to control the switching of the two motor pumps. The plunger servo motor pump mainly realizes high-power steering under high pressure and large flow, while the screw servo motor pump mainly realizes low-power and silent steering. The combination of the two servo motor pump solutions solves the contradiction between low noise under small working conditions and high power and large flow, and has high reliability.

[0064] (2) A variety of hydraulic pulsation silencers + double-layer vibration isolators are used to achieve the best silent working effect. The first type is a fixed-frequency pressure pulsation silencer, which is installed near the inlet and outlet of the motor pump to eliminate the pressure pulsation generated by the main characteristic frequency of the pump source; the second type is a broad-spectrum pressure pulsation attenuator, which is connected in series in the main pipeline. By setting the gradient inflation pressure, the matching range of the silencer can be broadened to achieve the coverage of silent working conditions; the third type is a transient pressure pulsation absorber, which is installed at the output end of the energy device to absorb the transient pressure shock generated by the start-stop switching and reduce transient vibration. The combined use of the three silencers can make the energy device achieve excellent silent effect; among them, the fixed-frequency pressure pulsation silencer is specially configured for low-noise working conditions. Combined with the use of a screw servo motor pump, the energy device has a better silent effect in low-noise operation. At the same time, two layers of vibration isolators are matched between the integrated valve block assembly and the box assembly, and between the box assembly and the ship installation base to further reduce the vibration noise level transmitted to the hull by the integrated valve block assembly.

[0065] (3) Integrated miniaturized structural design: The present invention adopts a regular box-type structural design as a whole, which is mainly composed of three parts: an integrated valve block assembly, a control driver and a box assembly. It adopts a modular design, and each component adapts to the internal space layout and has a compact structure. There is a hydraulic cylinder connection oil port and an electrical connector for electrical connection with the steering instrument on the top of the box, which is convenient for mechanical and electrical connection operations. Compared with the control unit described in patent CN108869437B, the complex external cables between the control cabinet are eliminated, reducing the installation and maintenance workload.

[0066] This embodiment adopts an integrated motor pump of servo motor + plunger pump and an integrated motor pump of servo motor + screw pump to form a redundant configuration, which can meet the requirements of high-power and high-flow steering and low-power and silent steering respectively. A variety of hydraulic pulsation silencers are connected in series in the main oil circuit to weaken the vibration noise during the flow of high-pressure oil, and a double-layer vibration isolator is used in the main structure to further reduce the vibration and noise level transmitted to the hull. The present invention can effectively solve the contradiction between low noise in small working conditions and high power and high flow in the ship steering gear energy device, and through reasonable structural design, it has the advantages of high integration and miniaturization.

[0067] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0068] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A non-similar redundant electrically driven hydraulic energy device, characterized in that: It includes a box assembly, a control driver, an integrated valve block assembly, a primary vibration isolator, a secondary vibration isolator and a mounting base, wherein: The control driver is installed at the top of the inner side of the box assembly to control the integrated valve block assembly. The integrated valve block assembly is connected to the bottom of the inner side of the box assembly through a primary vibration isolator. The box assembly is connected to the mounting base through a secondary vibration isolator. The mounting base is set on the test ground. The box assembly and the integrated valve block assembly achieve vibration level reduction through the primary vibration isolator and the secondary vibration isolator.

2. A non-similar redundant electrically driven hydraulic energy device according to claim 1, characterized in that: The integrated valve block assembly includes a first motor pump, a second motor pump, a fixed-frequency pressure pulsation muffler, a broad-spectrum pressure pulsation attenuator, a transient pressure pulsation absorber, a solenoid valve, and a two-way oil filter assembly, wherein: The first motor pump is arranged on the inner side of the box structure, and the second motor pump is arranged at the center position of the inner side of the box structure, and both are driven by the control driver to rotate; the first motor pump and the second motor pump are both controlled by solenoid valves, and are connected to the external main oil circuit interface under different working modes. A two-way oil filter assembly is arranged on the connection passage between the first motor pump, the second motor pump and the external main oil circuit interface; broad-spectrum pressure pulsation attenuators are arranged on both sides of the second motor pump for pressure attenuation; the two broad-spectrum pressure pulsation attenuators are connected to a transient pressure pulsation absorber on the side close to the first motor pump, and work together with the broad-spectrum pressure pulsation attenuator installed on the same side to absorb pressure shocks; the two broad-spectrum pressure pulsation attenuators are connected to a fixed-frequency pressure pulsation muffler on the side away from the first motor pump, which is used to eliminate the pressure pulsation of the motor pump.

3. A non-similar redundant electric drive hydraulic energy device according to claim 2, characterized in that: The first motor pump includes a servo motor and a plunger pump, and the rotation of the servo motor drives the plunger pump to achieve full-power steering; the second motor pump includes a servo motor and a screw pump, and the rotation of the servo motor drives the screw pump to achieve low-power steering; the solenoid valve adopts a direct-acting solenoid valve, which is used to control the action of the first motor pump and the second motor pump, and to isolate the first motor pump and the second motor pump.

4. A non-similar redundant electrically driven hydraulic energy device according to claim 2, characterized in that: The fixed-frequency pressure pulsation muffler is used to eliminate the pressure pulsation generated by the first motor pump and the second motor pump. The broad-spectrum pressure pulsation attenuator is filled with a gradient preset gas pressure to broaden the matching operating range of the fixed-frequency pressure pulsation muffler; the transient pressure pulsation absorber absorbs the transient pressure shock generated during the start and stop of the first motor pump and the second motor pump and reduces transient vibration; the two-way oil filter assembly cleans the hydraulic medium after the first motor pump and the second motor pump are connected to the main oil circuit interface, and is replaced or disassembled according to the connection status of the first motor pump, the second motor pump and the main oil circuit interface.

5. A non-similar redundant electric drive hydraulic energy device according to claim 4, characterized in that: The fixed-frequency pressure pulsation muffler, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber are arranged in series in the integrated valve block assembly through cables to reduce the pressure pulsation of the hydraulic oil in the main oil circuit and reduce vibration noise.

6. A non-similar redundant electrically driven hydraulic energy device according to claim 2, characterized in that: The integrated valve block assembly also includes a one-way valve, a high-pressure safety valve, a booster tank, a filling valve, and a manual bypass valve, wherein: The one-way valve and the high-pressure safety valve are both arranged on the interface between the first motor pump and the second motor pump and the main oil circuit. The one-way valve is used to replenish oil for the servo motor to prevent air suction, and the high-pressure safety valve is used to prevent component damage; the boost oil tank is arranged at the connection point of the first motor pump and the second motor pump, and the oil replenishment is controlled by the one-way valve; the filling valve is arranged on the boost oil tank, which is used for manual vacuum extraction and filling of liquid medium; the manual bypass valve is arranged at the boost oil tank port.

7. A control method for an electrically driven hydraulic energy device according to claim 2, characterized in that include: Confirm the working mode of the energy device and the corresponding control instructions; According to the working mode and control instructions, the driving controller is operated to power on the first motor pump or the second motor pump through the solenoid valve, and the first motor pump or the second motor pump is connected to the main oil circuit interface and rotates at a certain speed under the control of the driving controller; When the control instruction is the piston rod extension instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the two-way oil filter assembly, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to extend; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, and the solenoid valve in sequence; The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

8. The control method of a non-similar redundant electric drive hydraulic energy device according to claim 7, characterized in that: When the control instruction is a piston rod retraction instruction of the hydraulic cylinder, the first motor pump or the second motor pump outputs the pressure oil and then enters the external hydraulic cylinder through the solenoid valve, the broad-spectrum pressure pulsation attenuator, and the transient pressure pulsation absorber to push the piston rod to retract; the low pressure in the external hydraulic cylinder flows back to the first motor pump or the second motor pump through the transient pressure pulsation absorber, the broad-spectrum pressure pulsation attenuator, the two-way oil filter assembly, and the solenoid valve in sequence; The position signal of the displacement sensor of the external hydraulic cylinder is collected by the driving controller, and when the piston rod is in place, the first motor pump or the second motor pump is stopped.

9. The control method of a non-similar redundant electric drive hydraulic energy device according to claim 7, characterized in that: The working modes include a high-power steering mode and a low-noise working mode; In high-power steering mode, only the second motor pump is in operation; in low-noise working mode, only the first motor pump is in operation.

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