CN111608997A

CN111608997A - Hydraulic system for pod propulsion

Info

Publication number: CN111608997A
Application number: CN202010272771.1A
Authority: CN
Inventors: 程校; 方敏; 顾德亮
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-09-01

Abstract

The present disclosure provides a hydraulic system of a pod thruster, comprising: the device comprises a driving pump module, a motor module, an oil tank and a flushing module; the driving pump module is used for driving the motor module; the flushing module comprises: the oil outlet of the flushing pump is communicated with a flushing oil port of the motor module; the first detection unit is configured to give an alarm when the oil pressure at the oil inlet of the first detection unit is lower than a first threshold; the second detection unit is configured to control the flushing motor to stop working when the oil pressure at the oil inlet of the second detection unit is lower than a first threshold value and the duration time exceeds a second threshold value. The hydraulic motor bearing and the bearing sealing ring can be washed and cooled, and the pod propeller hydraulic system can be guaranteed to normally operate for a long time.

Description

Hydraulic system for pod propulsion

Technical Field

The disclosure relates to the technical field of hydraulic control, in particular to a hydraulic system of a pod propeller.

Background

The pod propeller is a propulsion device, the pod is hung below a ship body through an upright post, and a motor arranged in a cabin body directly drives a propeller of the pod propeller through a motor shaft, so that the pod propeller can provide omnibearing thrust for the ship body, and the pod propeller is important equipment for extremely scientific investigation of the icebreaker.

Slewing is one of the most frequent actions during operation of the pod propellers and is typically driven by a low-speed, high-torque hydraulic motor. During rotation, the hydraulic system drives the hydraulic motor to rotate to drive the driving gear to rotate, and the driving gear drives the inner ring gear of the slewing bearing meshed with the driving gear to rotate, so that rotation of the pod propeller is finally realized.

However, the requirement of the hydraulic system of the ice breaker on the working temperature is strict in the polar science research, and if the bearing and the bearing sealing ring of the hydraulic motor cannot be cooled in time, the hydraulic system of the pod propeller cannot keep long-term normal operation so as to meet the requirement of the safety harboring returning capability of the ice breaker in the polar science research.

Disclosure of Invention

The embodiment of the disclosure provides a hydraulic system of a pod propeller, which can flush and cool a bearing and a bearing sealing ring of a hydraulic motor, and ensure that the hydraulic system of the pod propeller can normally operate for a long time. The technical scheme is as follows:

the disclosed embodiments provide a hydraulic system of a pod thruster, the hydraulic system comprising: the device comprises a driving pump module, a motor module, an oil tank and a flushing module; the driving pump module is provided with a first oil port, a second oil port and an oil inlet, the motor module is provided with a first oil port, a second oil port, a flushing oil port and an oil drainage port, the first oil port of the driving pump module is communicated with the first oil port of the motor module, the second oil port of the driving pump module is communicated with the second oil port of the motor module, and the oil inlet of the driving pump module and the oil drainage port of the motor module are both communicated with the oil tank; the flushing module comprises: the oil inlet of the flushing pump is communicated with the oil tank, and the oil outlet of the flushing pump is communicated with the flushing oil port of the motor module; the first detection unit is provided with an oil inlet, the oil inlet of the first detection unit is connected to an oil path through which an oil outlet of the flushing pump is communicated with a flushing oil port of the motor module, and the first detection unit is configured to give an alarm when the oil pressure at the oil inlet of the first detection unit is lower than a first threshold value; the second detection unit is provided with an oil inlet, the oil inlet of the second detection unit is connected to an oil path through which the oil outlet of the flushing pump is communicated with the flushing oil port of the motor module, and the second detection unit is configured to control the flushing motor to stop working when the oil pressure at the oil inlet of the second detection unit is lower than the first threshold and the duration time exceeds a second threshold.

In one implementation manner of the embodiment of the present disclosure, the first detection unit includes: the oil inlet of the first flushing pressure switch is connected to an oil path communicated between the oil outlet of the flushing pump and the flushing oil port of the motor module, and the switch element of the first flushing pressure switch is connected to the control circuit of the alarm.

In an implementation manner of the embodiment of the present disclosure, the second detection unit includes: the oil inlet of the second flushing pressure switch is connected to an oil path communicated with the oil outlet of the flushing pump and the flushing oil port of the motor module, the controller is electrically connected with the flushing motor and the switch element of the second flushing pressure switch, and the controller is configured to control the flushing motor to stop working when the switch element of the second flushing pressure switch acts and the duration time exceeds the second threshold value.

In an implementation manner of the embodiment of the present disclosure, the flushing module further includes a flushing overflow valve, a first oil port of the flushing overflow valve is connected to an oil path between the oil outlet of the flushing pump and the flushing oil port of the motor module, and a second oil port of the flushing overflow valve is communicated with the oil tank.

In an implementation manner of the embodiment of the present disclosure, the flushing module further includes a flushing filter, an oil inlet of the flushing filter is communicated with an oil outlet of the flushing pump, and an oil outlet of the flushing filter is communicated with a flushing oil port of the motor module.

In an implementation manner of the embodiment of the present disclosure, the flushing module further includes a flushing check valve, an oil inlet of the flushing check valve is communicated with an oil outlet of the flushing filter, and an oil outlet of the flushing check valve is communicated with a flushing oil port of the motor module.

In one implementation of the disclosed embodiment, the hydraulic system further includes a fault isolation module, the drive pump module includes a first variable pump assembly and a second variable pump, and the motor module includes a first motor and a second motor; the first variable pump assembly and the second variable pump are respectively provided with a first oil port, a second oil port and an oil inlet, and the fault isolation module is provided with a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port, a sixth oil port, a seventh oil port, an eighth oil port and an oil drainage port; a first oil port of the first variable pump assembly is communicated with a first oil port of the fault isolation module, and a second oil port of the first variable pump assembly is communicated with a second oil port of the fault isolation module; a first oil port of the second variable pump is communicated with a third oil port of the fault isolation module, and a second oil port of the second variable pump is communicated with a fourth oil port of the fault isolation module; a fifth oil port of the fault isolation module is communicated with a first oil port of the first motor, and a seventh oil port of the fault isolation module is communicated with a second oil port of the first motor; a sixth oil port of the fault isolation module is communicated with a first oil port of the second motor, and an eighth oil port of the fault isolation module is communicated with a second oil port of the second motor; the oil inlet of the first variable pump assembly, the oil inlet of the second variable pump, the oil drain port of the fault isolation module, the oil drain port of the first motor and the oil drain port of the second motor are all communicated with the oil tank; the fault isolation module comprises a first sequence valve, a second sequence valve, a first two-position four-way valve, a second two-position four-way valve and a fault isolation valve; a first oil port of the first sequence valve is communicated with a first oil port of the fault isolation module, a second oil port of the first sequence valve is communicated with a second oil port of the fault isolation module, a third oil port of the first sequence valve is communicated with a third oil port of the first two-position four-way valve, and a fourth oil port of the first sequence valve is communicated with a fourth oil port of the first two-position four-way valve; a first oil port of the second sequence valve is communicated with a third oil port of the fault isolation module, a second oil port of the second sequence valve is communicated with a fourth oil port of the fault isolation module, a third oil port of the second sequence valve is communicated with a third oil port of a second two-position four-way valve, and a fourth oil port of the second sequence valve is communicated with a fourth oil port of the second two-position four-way valve; a first oil port and a second oil port of the first two-position four-way valve, and a first oil port and a second oil port of the second two-position four-way valve are both communicated with an oil drainage port of the fault isolation module, a third oil port of the first two-position four-way valve is communicated with a fifth oil port of the fault isolation module, a fourth oil port of the first two-position four-way valve is communicated with a seventh oil port of the fault isolation module, a third oil port of the second two-position four-way valve is communicated with a sixth oil port of the fault isolation module, and a fourth oil port of the second two-position four-way valve is communicated with an eighth oil port of the fault isolation module; the first oil port of the fault isolation valve is respectively communicated with the third oil port of the first sequence valve and the third oil port of the first two-position four-way valve, the second oil port of the fault isolation valve is respectively communicated with the fourth oil port of the first sequence valve and the fourth oil port of the first two-position four-way valve, the third oil port of the fault isolation valve is respectively communicated with the third oil port of the second sequence valve and the third oil port of the second two-position four-way valve, and the fourth oil port of the fault isolation valve is respectively communicated with the fourth oil port of the second sequence valve and the fourth oil port of the second two-position four-way valve.

In one implementation of the disclosed embodiment, the first variable displacement pump assembly includes a first servo control mechanism, a first variable displacement pump, and a first pressure switch; a first auxiliary pump is integrated in the first variable pump, an oil outlet of the first variable pump is communicated with a first oil port of the first variable pump assembly, and an oil outlet of the first variable pump is communicated with a second oil port of the first variable pump assembly; an oil inlet of the first auxiliary pump is communicated with an oil inlet of the first variable pump assembly; and the oil inlet of the first pressure switch is communicated with the oil outlet of the first auxiliary pump.

In one implementation of the disclosed embodiment, the second variable displacement pump assembly includes a second servo control mechanism, a second variable displacement pump, and a second pressure switch; a second auxiliary pump is integrated in the second variable pump, an oil outlet of the second variable pump is communicated with a first oil port of the second variable pump assembly, and an oil outlet of the second variable pump is communicated with a second oil port of the second variable pump assembly; an oil inlet of the second auxiliary pump is communicated with an oil inlet of the second variable pump assembly; and an oil inlet of the second pressure switch is communicated with an oil outlet of the second auxiliary pump.

In an implementation manner of the embodiment of the present disclosure, the hydraulic system further includes an oil compensation distributor module, where the oil compensation distributor module includes a first oil compensation check valve, a second oil compensation check valve, a third oil compensation check valve, and a fourth oil compensation check valve; the first variable pump assembly is provided with a fourth oil port, the oil outlet of the first auxiliary pump is communicated with the fourth oil port of the first variable pump assembly, the second variable pump assembly is provided with a fourth oil port, and the oil outlet of the second auxiliary pump is communicated with the fourth oil port of the second variable pump assembly; an oil inlet of the first oil supplementing one-way valve is communicated with a fourth oil port of the first variable pump assembly, and an oil outlet of the first oil supplementing one-way valve is respectively communicated with a first oil port and a second oil port of the first motor; an oil inlet of the second oil supplementing one-way valve is communicated with a fourth oil port of the second variable pump assembly, and an oil outlet of the second oil supplementing one-way valve is respectively communicated with a first oil port and a second oil port of the first motor; an oil inlet of the third oil supplementing one-way valve is communicated with a fourth oil port of the first variable pump assembly, and an oil outlet of the third oil supplementing one-way valve is respectively communicated with a first oil port and a second oil port of the second motor; an oil inlet of the fourth oil supplementing one-way valve is communicated with a fourth oil port of the second variable pump assembly, and an oil outlet of the fourth oil supplementing one-way valve is respectively communicated with the first oil port and the second oil port of the second motor.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the hydraulic system comprises a driving pump module, a motor module, an oil tank and a flushing module, wherein a first oil port of the driving pump module is communicated with a first oil port of the motor module, a second oil port of the driving pump module is communicated with a second oil port of the motor module, an oil inlet of the driving pump module and an oil drainage port of the motor module are both communicated with the oil tank, namely after an oil inlet of the driving pump module sucks oil from the oil tank, the driving pump module outputs the oil from the first oil port to the motor module, and the motor module drives a slewing bearing inner ring gear to rotate by utilizing the power of the input oil, so that the pod propeller is rotated; the flushing module comprises a flushing pump, a first detection unit, a second detection unit and a flushing motor for driving the flushing pump, when the working temperature of a bearing and a bearing sealing ring of the motor is too high or the viscosity of oil in the motor is too high, the flushing motor can be used for driving the flushing pump to work, the flushing pump outputs the oil to a flushing oil port of the motor module, so that the bearing and the bearing sealing ring in the motor are flushed and cooled, the oil attached to the interior of the motor is flushed, and the hydraulic system of the pod propeller can be ensured to normally operate for a long time; the oil inlet of the first detection unit is connected to an oil path through which an oil outlet of the flushing pump is communicated with a flushing oil port of the motor module, and the first detection unit can give an alarm when the oil pressure at the oil inlet of the first detection unit is lower than a first threshold value, so that when the oil pressure of oil output by the flushing pump is too low, the fault of the oil path of the flushing pump can be timely judged, and an operator can be reminded; and the oil inlet of the second detection unit is connected on the oil outlet of the flushing pump and the oil way communicated with the flushing oil port of the motor module, the second detection unit can control the flushing motor to stop working when the oil pressure at the oil inlet of the second detection unit is lower than a first threshold value and the duration exceeds a second threshold value, so that the oil pressure of oil output by the flushing pump is too low and lasts for a certain time, the flushing oil way which generates faults can be timely controlled to stop working under the condition that an operator does not act, the safety of the flushing module is improved, and the pod propeller hydraulic system can be ensured to normally operate for a long time.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic system of a pod thruster provided by an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a first detection unit provided in the embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a second detection unit provided in the embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a hydraulic system of a pod thruster provided by an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a fault isolation module according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a first variable displacement pump assembly provided by an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a second variable displacement pump assembly provided by an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an oil replenishment distributor module provided in an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a first shock module provided in accordance with an embodiment of the present disclosure;

figure 10 is a schematic structural view of a second shock module provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a hydraulic system of a pod propeller provided by an embodiment of the disclosure. As shown in fig. 1, the hydraulic system includes: drive pump module X, motor module Y, oil tank 4 and flush module 10.

As shown in fig. 1, the driving pump module X has a first oil port X1, a second oil port X2 and an oil inlet X3, the motor module Y has a first oil port Y1, a second oil port Y2, a flushing oil port Y3 and an oil drain port Y4, the first oil port X1 of the driving pump module X is communicated with the first oil port X1 of the motor module Y, the second oil port X2 of the driving pump module X is communicated with the second oil port Y2 of the motor module Y, and the oil inlet X3 of the driving pump module X and the oil drain port Y4 of the motor module Y are both communicated with the oil tank 4.

As shown in fig. 1, the flush module 10 includes: the oil outlet of the flushing pump 100 is communicated with a flushing oil port Y3 of the motor module Y; the first detection unit 101 has an oil inlet, the oil inlet of the first detection unit 101 is connected to an oil path through which the oil outlet of the flushing pump 100 is communicated with the flushing port Y3 of the motor module Y, and the first detection unit 101 is configured to issue an alarm when the oil pressure at the oil inlet of the first detection unit 101 is lower than a first threshold value; the second detection unit 102 has an oil inlet, the oil inlet of the second detection unit 102 is connected to an oil path through which the oil outlet of the flushing pump 100 is communicated with the flushing oil port Y3 of the motor module Y, and the second detection unit 102 is configured to control the flushing motor 103 to stop working when the oil pressure at the oil inlet of the second detection unit 102 is lower than a first threshold and the duration exceeds a second threshold.

Fig. 2 is a schematic structural diagram of a first detection unit according to an embodiment of the present disclosure. As shown in fig. 2, the first detection unit 101 includes: the oil inlet of the first flushing pressure switch 101a is connected to an oil path through which the oil outlet of the flushing pump 100 is communicated with the flushing port Y3 of the motor module Y, and the switch element of the first flushing pressure switch 101a is connected to the control circuit of the alarm 101 b.

The first flushing pressure switch 101a may be a pressure switch, and the pressure switch has an oil inlet and a switching element, and when the pressure at the oil inlet of the pressure switch reaches a predetermined fluid pressure, the switching element in the pressure switch is activated, that is, the switching element is opened or closed. For example, the switching element may be a microswitch, a magnetic switch, or the like.

As shown in fig. 2, the oil inlet of the first flushing pressure switch 101a is connected to the oil path, and the switching element of the first flushing pressure switch 101a is connected to the control circuit of the alarm 101b, so that when the pressure at the oil inlet of the first flushing pressure switch 101a reaches a first threshold value, for example, 0.5MPa, the switching element is closed, so that the control circuit of the alarm 101a is powered on, and the alarm is operated to give an alarm.

Fig. 3 is a schematic structural diagram of a second detection unit according to an embodiment of the present disclosure. As shown in fig. 3, the second detection unit 102 includes: a second flushing pressure switch 102a and a controller 102b, wherein an oil inlet of the second flushing pressure switch 102a is connected to an oil path through which an oil outlet of the flushing pump 100 is communicated with a flushing oil port Y3 of the motor module Y, the controller 102b is electrically connected with the flushing motor 103 and switching elements of the second flushing pressure switch 102a, and the controller 102b is configured to control the flushing motor 103 to stop working when the switching elements of the second flushing pressure switch 102a are actuated and the duration time exceeds a second threshold value.

The second flushing pressure switch 102a may be a pressure switch, and the pressure switch has an oil inlet and a switching element, and when the pressure at the oil inlet of the pressure switch reaches a predetermined fluid pressure, the switching element in the pressure switch is activated, that is, the switching element is opened or closed. For example, the switching element may be a microswitch, a magnetic switch, or the like.

The Controller 102b may be a Programmable Logic Controller (PLC), which is a digital electronic device with a microprocessor and can load control instructions into a memory at any time for storage and execution.

As shown in fig. 2, the oil inlet of the second flushing pressure switch 102a is connected to the oil circuit, and the controller 102b and the flushing motor 103 are electrically connected to the switching element of the second flushing pressure switch, so that the switching element is closed when the pressure at the oil inlet of the second flushing pressure switch 102a reaches a first threshold value, for example, 0.5 MPa. Since the switching element is electrically connected to the controller, the controller 102b may acquire an action signal output by the switching element to determine whether the switching element is actuated, and may control the flushing motor 103 to stop working when the switching element of the second flushing pressure switch 102a is actuated and the duration exceeds a second threshold, for example, 2 s.

As shown in fig. 1, the flushing module 10 may further include a flushing overflow valve 104, a first port of the flushing overflow valve 104 is connected to an oil path through which an oil outlet of the flushing pump 100 is communicated with a flushing port Y3 of the motor module Y, and a second port of the flushing overflow valve is communicated with an oil tank.

For example, the set pressure of the flushing relief valve 104 may be 1MPa, so that when the oil pressure in the oil path of the flushing module 10 exceeds the set pressure of 1MPa, the second oil port of the flushing relief valve 104 is communicated, so as to discharge part of the oil in the oil path of the flushing module 10 to the oil tank 4, and make the oil path of the flushing module 10 not exceed the set pressure of 1MPa, thereby ensuring that the set pressure of 1MPa does not cause a safety problem due to an excessively high pressure, and improving reliability.

As shown in fig. 1, the flushing module 10 may further include a flushing filter 105, an oil inlet of the flushing filter 105 is communicated with an oil outlet of the flushing pump 100, and an oil outlet of the flushing filter 105 is communicated with a flushing oil port Y3 of the motor module Y. The oil outlet of the flushing pump 100 and the oil passage of the flushing oil port Y3 of the motor module Y are provided with the flushing filter 105, so that the cleanliness of the flushing oil can be controlled, solid particles existing in the flushing oil can be filtered, and the damage to the internal parts of the motor by the solid particles can be avoided.

As shown in fig. 1, the flushing module 10 may further include a flushing check valve 106, an oil inlet of the flushing check valve 106 is communicated with an oil outlet of the flushing filter 105, and a flushing oil port Y3 of the oil outlet motor module Y of the flushing check valve 106 is communicated. The one-way flushing valve 106 can prevent the backflow of flushing oil or prevent the oil inside the motor from flowing back to the flushing module, and reliability is improved.

As shown in fig. 1, the flushing module 10 may further include a throttle valve 107 and a pressure gauge 108, an oil inlet of the throttle valve 107 is connected to an oil path through which an oil outlet of the flushing pump 100 is communicated with a flushing oil port Y3 of the motor module Y, and an oil outlet of the throttle valve 107 is communicated with an oil inlet of the pressure gauge 108. The oil outlet of the flushing pump 100 and the oil flow on the oil path communicated with the flushing oil port Y3 of the motor module Y can be adjusted by the throttle valve 107, the pressure gauge can receive oil with proper flow after the oil flow is adjusted to a proper value, so that the oil pressure on the oil path communicated with the flushing oil port Y3 of the motor module Y and the oil outlet of the flushing pump 100 can be measured, and the oil pressure can be conveniently checked by an operator at any time.

Fig. 4 is a schematic structural diagram of a hydraulic system of a pod propeller provided by the embodiment of the disclosure. As shown in fig. 4, the hydraulic system may further include a fault isolation module 3, a drive pump module including a first variable displacement pump assembly 1 and a second variable displacement pump assembly 2, and a motor module including a first motor M1, a second motor M24. The first variable pump assembly 1 has a first oil outlet a, a second oil outlet B and an oil inlet G. The second variable pump assembly 2 has a first oil outlet a, a second oil outlet B and an oil inlet G. The fault isolation module 3 has a first port a1, a second port B1, a third port a2, a fourth port B2, a fifth port C1, a sixth port C2, a seventh port D1, an eighth port D2, and an oil drain port T. The first port a of the first variable pump assembly 1 is communicated with the first port a1 of the fault isolation module 3, and the second port B of the first variable pump assembly 1 is communicated with the second port B1 of the fault isolation module 3. The first port a of the second variable pump assembly 2 is communicated with the third port a2 of the fault isolation module 3, and the second port B of the second variable pump assembly 2 is communicated with the fourth port B2 of the fault isolation module 3. The fifth port C1 of the fault isolation module 3 is communicated with the first port a of the first motor M1, and the seventh port D1 of the fault isolation module 3 is communicated with the second port B of the first motor M1. The sixth port C2 of the fault isolation module 3 communicates with the first port a of the second motor M2, and the eighth port D2 of the fault isolation module 3 communicates with the second port B of the second motor M2. The oil inlet G of the first variable pump assembly 1, the oil inlet G of the second variable pump assembly 2, the oil drain port T of the fault isolation module 3, the oil drain port T of the first motor M1 and the oil drain port T of the second motor M2 are all communicated with the oil tank 4.

Fig. 5 is a schematic structural diagram of a fault isolation module according to an embodiment of the present disclosure, and as shown in fig. 5, the fault isolation module 3 includes a first sequence valve 31, a second sequence valve 32, a first two-position four-way valve 33, a second two-position four-way valve 34, and a fault isolation valve 35.

The first port a of the first sequence valve 31 is communicated with the first port a1 of the fault isolation module 3, the second port B of the first sequence valve 31 is communicated with the second port B1 of the fault isolation module 3, the third port C of the first sequence valve 31 is communicated with the third port C of the first two-position four-way valve 33, and the fourth port D of the first sequence valve 31 is communicated with the fourth port D of the first two-position four-way valve 33.

The first port a of the second sequence valve 32 is communicated with the third port a2 of the fault isolation module 3, the second port B of the second sequence valve 32 is communicated with the fourth port B2 of the fault isolation module 3, the third port C of the second sequence valve 32 is communicated with the third port C of the second two-position four-way valve 34, and the fourth port D of the second sequence valve 32 is communicated with the fourth port D of the second two-position four-way valve 34.

The first oil port a and the second oil port B of the first two-position four-way valve 33, and the first oil port a and the second oil port B of the second two-position four-way valve 34 are both communicated with the oil drainage port T of the fault isolation module 3. The third port C of the first two-position four-way valve 33 is communicated with the fifth port C1 of the fault isolation module 3, and the fourth port D of the first two-position four-way valve 33 is communicated with the seventh port D1 of the fault isolation module 3. A third port C of the second two-position four-way valve 34 is communicated with a sixth port C2 of the fault isolation module 3, and a fourth port D of the second two-position four-way valve 34 is communicated with an eighth port D2 of the fault isolation module 3.

The first port a of the fault isolation valve 35 is respectively communicated with the third port C of the first sequence valve 31 and the third port C of the first two-position four-way valve 33, and the second port B of the fault isolation valve 35 is respectively communicated with the fourth port D of the first sequence valve 31 and the fourth port D of the first two-position four-way valve 33. The third port C of the fault isolation valve 35 is respectively communicated with the third port C of the second sequence valve 32 and the third port C of the second two-position four-way valve 34, and the fourth port D of the fault isolation valve 35 is respectively communicated with the fourth port D of the second sequence valve 32 and the fourth port D of the second two-position four-way valve 34.

In the present embodiment, the output shaft of the first motor M1 is connected to a first driving gear (not shown), the output shaft of the second motor M2 is connected to a second driving gear (not shown),

the first driving gear and the second driving gear are meshed with an inner ring gear of the rotary support P.

According to the embodiment of the invention, the fault isolation module is arranged in the hydraulic system, so that the hydraulic system can be divided into two independent systems, when a fault occurs in an oil path between the first variable pump assembly and the first motor, the fault isolation valve can be controlled to be closed, and the first sequence valve and the first two-position four-way valve are controlled to be opened, so that the first motor is in a free wheel working condition, and the second variable pump assembly can drive the second motor to rotate to drive the inner gear ring of the rotary support to rotate along with the free sliding of the rotary support, so that the full-rotary rudder propeller device can rotate. On the contrary, when an oil path between the second variable pump assembly and the second motor has a fault, the fault isolation valve can be controlled to be closed, and the second sequence valve and the second two-position four-way valve are controlled to be opened, so that the second motor is in a free wheel working condition, and freely rotates along with the rotation support, at the moment, the first variable pump assembly can drive the first motor to rotate to drive the inner gear ring of the rotation support to rotate, and the rotation of the full-rotation rudder propeller device is realized. Therefore, the hydraulic system provided by the invention can isolate the fault oil way and increase the mean time without fault of the hydraulic system, thereby greatly improving the working stability and reliability of the full-rotation rudder propeller.

In this embodiment, the first variable pump assembly 1 further has a third port C, the fault isolation module 3 further has a first control port E1, and the third port C of the first variable pump assembly 1 is communicated with the first control port E1 of the fault isolation module 3. The second variable pump assembly 2 further has a third port C, the fault isolation module 3 further has a second control port E2, and the third port C of the second variable pump assembly 2 is communicated with the second control port 2 of the fault isolation module 3.

In this embodiment, the first sequence valve 31, the second sequence valve 32, and the fault isolation valve 35 are all two-position, four-way valves. The first sequence valve 31 includes a first state and a second state, when the first sequence valve 31 is in the first state, the first port a and the third port C of the first sequence valve 31 are communicated, the second port B and the fourth port D are communicated, and the first sequence valve 31 is opened. When the first sequence valve 31 is in the second state, the first port a, the second port B, the third port C, and the fourth port D of the first sequence valve 31 are all closed, and the first sequence valve 31 is closed. The second sequence valve 32 includes a first state and a second state, when the second sequence valve 32 is in the first state, the first port a and the third port C of the second sequence valve 32 are communicated, the second port B and the fourth port D are communicated, and the second sequence valve 32 is opened. When the second sequence valve 32 is in the second state, the first port a, the second port B, the third port C, and the fourth port D of the first sequence valve 32 are all closed, and the second sequence valve 32 is closed. The first two-position four-way valve 33 includes a first state and a second state, when the first two-position four-way valve 33 is in the first state, the first port a and the third port C of the first two-position four-way valve 33 are communicated, the second port B and the fourth port D are communicated, and the first two-position four-way valve 33 is opened. When the first two-position four-way valve 33 is in the second state, the first port a, the second port B, the third port C, and the fourth port D of the first two-position four-way valve 33 are all blocked, and the first two-position four-way valve 33 is closed. The second two-position four-way valve 34 includes a first state and a second state, when the second two-position four-way valve 34 is in the first state, the first port a and the third port C of the second two-position four-way valve 34 are communicated, the second port B and the fourth port D are communicated, and the second two-position four-way valve 34 is opened. When the second two-position four-way valve 34 is in the second state, the first port a, the second port B, the third port C, and the fourth port D of the second two-position four-way valve 34 are all closed, and the second two-position four-way valve 34 is closed. The first two-position four-way valve 33 (or the second two-position four-way valve 34) can control the opening and closing of the oil inlet and the oil outlet of the first motor M1 (or the second motor M2), and when the first two-position four-way valve 33 (or the second two-position four-way valve 34) is in the first state, the first motor M1 (or the second motor M2) can be in a free wheel working condition and freely rotates along with the rotation support P.

The fault isolation valve 35 includes a first state and a second state, when the fault isolation valve 35 is in the first state, the first port a and the third port C of the fault isolation valve 35 are communicated, the second port B and the fourth port D are communicated, and the fault isolation valve 35 is opened. When the fault isolation valve 35 is in the second state, the first port a, the second port B, the third port C, and the fourth port D of the fault isolation valve 35 are all closed, and the fault isolation valve 35 is closed. By controlling the opening and closing of the fault isolation valve 35, the first variable pump assembly 1 and the second variable pump assembly 2 can be operated in parallel or independently.

Optionally, the first two-position four-way valve 33, the second two-position four-way valve 34 and the fault isolation valve 35 are all reversing valves with inductive valve core position monitoring and manual emergency functions, and can monitor the opening and closing states.

Fig. 6 is a schematic structural diagram of a first variable displacement pump assembly provided by the embodiment of the present disclosure, and as shown in fig. 3, the first variable displacement pump assembly 1 includes a first servo control mechanism 11, a first variable displacement pump 12 and a first pressure switch 13. The first auxiliary pump 121 is integrated inside the first variable displacement pump 12, an oil outlet a of the first variable displacement pump 12 is communicated with a first oil port a of the first variable displacement pump assembly 1, and an oil outlet B of the first variable displacement pump 12 is communicated with a second oil port B of the first variable displacement pump assembly 1.

An oil outlet C of the first auxiliary pump 121 is communicated with a third oil port C of the first variable displacement pump assembly 1, and an oil inlet D of the first auxiliary pump 121 is communicated with an oil inlet G of the first variable displacement pump assembly 1.

An oil inlet of the first pressure switch 13 is communicated with the third oil port C of the first auxiliary pump 121, and the first pressure switch 13 can detect and alarm the pressure of the lowest oil pumped out by the first auxiliary pump 121.

In this embodiment, the first pressure switch 13 alarms when the pressure of the oil pumped by the first auxiliary pump 121 is lower than 10 MPa.

The first variable displacement pump 12 is a swash plate type axial plunger variable displacement pump, and the first variable displacement pump 12 is driven by a first motor 122. The reversing and shifting of the first motor M1 can be achieved by a stepless change of the first servo control 11.

Further, as shown in fig. 3, the first variable pump assembly 1 further has a fourth oil port D and a fifth oil port E, the oil outlet C of the first auxiliary pump 121 is communicated with the fourth oil port D of the first variable pump assembly 1, and the fifth oil port E of the first variable pump assembly 1 is communicated with the oil tank 4.

Optionally, the first variable pump assembly 1 may further comprise a first filter 14, a check valve 15, a check valve 16 and a first bidirectional high pressure relief valve 17 and a first auxiliary pump relief valve 18.

An oil inlet of the first filter 14 is communicated with an oil outlet C of the first auxiliary pump 121, an oil outlet of the first filter 14 is respectively communicated with an oil inlet of the check valve 15 and an oil inlet of the check valve 16, an oil outlet of the check valve 15 is communicated with a first oil port a of the first variable pump assembly 1, and an oil outlet of the check valve 16 is communicated with a second oil port B of the first variable pump assembly 1. The oil pumped by the first auxiliary pump 121 can be filtered by providing the first filter 18.

The first port a1 and the first control port E1 of the first bidirectional high-pressure relief valve 17 communicate with the first port a of the first variable pump assembly 1, and the second port a2 and the second control port E2 of the first bidirectional high-pressure relief valve 12 communicate with the second port B of the first variable pump assembly 1. The safety of the oil path between the first variable pump assembly 1 and the first motor M1 can be defined by providing the first bidirectional high-pressure relief valve 17.

An oil inlet and a control oil port of the first auxiliary pump overflow valve 18 are communicated with an oil outlet of the first filter 14, and an oil outlet of the first auxiliary pump overflow valve 18 is communicated with a fifth oil port E of the first variable pump assembly 1. The circuit safety of the first auxiliary pump excess flow valve 18 can be defined by providing the first auxiliary pump excess flow valve 18.

Alternatively, the set pressure of the first auxiliary pump relief valve 18 may be 24 Mpa.

In this embodiment, the check valve 15 and the check valve 16 are provided to make the oil pumped from the oil outlet C of the first auxiliary pump 121 to be pressurized and supplied to the first motor M1, and on the other hand, the first auxiliary pump 121 can supply the pilot control oil to the first servo control mechanism 11.

Fig. 7 is a schematic structural diagram of a second variable displacement pump assembly provided by the embodiment of the present disclosure, and as shown in fig. 7, the second variable displacement pump assembly 2 includes a second servo control mechanism 21, a second variable displacement pump 22 and a second pressure switch 23.

A second auxiliary pump 221 is integrated inside the second variable displacement pump 22, an oil outlet a of the second variable displacement pump 22 is communicated with a first oil port a of the second variable displacement pump assembly 2, and an oil outlet B of the second variable displacement pump 22 is communicated with a second oil port B of the second variable displacement pump assembly 2.

An oil outlet C of the second auxiliary pump 221 is communicated with a third oil port C of the second variable displacement pump assembly 2, and an oil inlet D of the second auxiliary pump 221 is communicated with an oil inlet G of the second variable displacement pump assembly 2.

An oil inlet of the second pressure switch 23 is communicated with the third oil port C of the second auxiliary pump 221, and the second pressure switch 23 can detect and alarm the pressure of the lowest oil pumped out by the second auxiliary pump 221.

In this embodiment, the second pressure switch 23 alarms when the pressure of the oil pumped by the second auxiliary pump 221 is lower than 10 MPa.

The second variable displacement pump 22 is a swash plate type axial plunger variable displacement pump, and the second variable displacement pump 22 is driven by a second motor 222. The reversing and shifting of the second motor M2 can be accomplished by stepless variation of the second servo control mechanism 21.

Further, as shown in fig. 4, the second variable pump assembly 2 further has a fourth oil port D and a fifth oil port E, the oil outlet C of the second auxiliary pump 221 is communicated with the fourth oil port D of the second variable pump assembly 2, and the fifth oil port E of the second variable pump assembly 2 is communicated with the oil tank 4.

Optionally, the second variable pump assembly 2 is identical in combination with the first variable pump assembly 1. The second variable pump assembly 2 may also include a second filter 24, a check valve 25, a check valve 26, and a second two-way high pressure spill valve 27 and a second auxiliary pump spill valve 28.

An oil inlet of the second filter 24 is communicated with an oil outlet C of the second auxiliary pump 221, an oil outlet of the second filter 24 is respectively communicated with an oil inlet of the check valve 25 and an oil inlet of the check valve 26, an oil outlet of the check valve 25 is communicated with a first oil port a of the second variable pump assembly 2, and an oil outlet of the check valve 26 is communicated with a second oil port B of the second variable pump assembly 2. The oil pumped by the second auxiliary pump 221 can be filtered by the second filter 28.

The first port a2 and the first control port E2 of the second bidirectional high-pressure relief valve 27 communicate with the first port a of the second variable pump assembly 2, and the second port a2 and the second control port E2 of the second bidirectional high-pressure relief valve 22 communicate with the second port B of the second variable pump assembly 2. The safety of the oil path between the second variable pump assembly 2 and the second motor M2 can be defined by providing the second two-way high-pressure relief valve 27.

An oil inlet and a control oil port of the second auxiliary pump overflow valve 28 are communicated with an oil outlet of the second filter 24, and an oil outlet of the second auxiliary pump overflow valve 28 is communicated with a fifth oil port E of the second variable pump assembly 2. The circuit safety of the second auxiliary pump excess flow valve 28 can be defined by providing the second auxiliary pump excess flow valve 28.

Alternatively, the set pressure of the second auxiliary pump relief valve 28 may be 24 Mpa.

In the present embodiment, the oil pumped out from the oil outlet C of the second auxiliary pump 221 is pressurized and supplemented to the second motor M2 by the provision of the check valve 25 and the check valve 26, and on the other hand, the first auxiliary pump 221 can supply the pilot control oil to the second servo control mechanism 21.

Fig. 8 is a schematic structural diagram of an oil supply distributor module according to an embodiment of the present disclosure, and as shown in fig. 8, the hydraulic system further includes an oil supply distributor module 5, and the oil supply distributor module 5 includes a first oil supply check valve 51, a second oil supply check valve 52, a third oil supply check valve 53, and a fourth oil supply check valve 54.

An oil inlet of the first oil supplementing check valve 51 is communicated with a fourth oil port D of the first variable pump assembly 1, and an oil outlet of the first oil supplementing check valve 51 is respectively communicated with a first oil port a and a second oil port B of the first motor M1.

An oil inlet of the second oil supplementing check valve 52 is communicated with a fourth oil port D of the second variable pump assembly 2, and an oil outlet of the second oil supplementing check valve 52 is respectively communicated with a first oil port A and a second oil port B of the first motor M1.

An oil inlet of the third oil supplementing check valve 53 is communicated with a fourth oil port D of the first variable pump assembly 1, and an oil outlet of the third oil supplementing check valve 53 is respectively communicated with a first oil port a and a second oil port B of the second motor M2.

An oil inlet of the fourth oil supplementing check valve 54 is communicated with a fourth oil port D of the second variable pump assembly 2, and an oil outlet of the fourth oil supplementing check valve 54 is respectively communicated with a first oil port a and a second oil port B of the second motor M2.

By providing the oil supply distributor module 5, when one of the first variable pump assembly 1 and the second variable pump assembly 2 is operating, hydraulic oil pumped out by the first variable pump assembly 1 or the second variable pump assembly 2 can be simultaneously delivered to the first motor M1 and the second motor M2 to supply oil to the first motor M1 and the second motor M2.

Fig. 9 is a schematic structural diagram of a first damping module according to an embodiment of the present disclosure, and as shown in fig. 9, the hydraulic system further includes the first damping module 6, and the first damping module 6 includes a first two-way relief valve 61, a first damping check valve 62, and a second damping check valve 63.

The first port a1 and the first control port E1 of the first two-way relief valve 61 are both communicated with the first port a of the first motor M1, and the second port a2 and the second control port E2 of the first two-way relief valve 61 are both communicated with the second port B of the first motor M1.

An oil inlet of the first damping check valve 62 is respectively communicated with an oil outlet of the first oil supplementing check valve 51 and an oil outlet of the second oil supplementing check valve 52, and an oil outlet of the first damping check valve 62 is communicated with a first oil port A1 of the first two-way safety valve 61.

An oil inlet of the second damping check valve 63 is respectively communicated with an oil outlet of the first oil supplementing check valve 51 and an oil outlet of the second oil supplementing check valve 52, and an oil outlet of the second damping check valve 63 is communicated with a second oil port A2 of the first two-way safety valve 61.

Fig. 10 is a schematic structural diagram of a second shock absorption module according to an embodiment of the present disclosure, and as shown in fig. 10, the hydraulic system further includes a second shock absorption module 7, and the second shock absorption module 7 has the same structure as the first shock absorption module 6. The second damping module 7 includes a second bi-directional relief valve 71, a third damping check valve 72 and a fourth damping check valve 73.

The first port a1 and the first control port E1 of the second bidirectional relief valve 71 are both communicated with the first port a of the second motor M2, and the second port a2 and the second control port E2 of the second bidirectional relief valve 71 are both communicated with the second port B of the second motor M2.

An oil inlet of the third damping check valve 72 is respectively communicated with an oil outlet of the third oil supplementing check valve 53 and an oil outlet of the fourth oil supplementing check valve 54, and an oil outlet of the third damping check valve 72 is communicated with a first oil port A1 of the second bidirectional safety valve 71.

An oil inlet of the fourth damping check valve 73 is respectively communicated with an oil outlet of the third oil supplementing check valve 53 and an oil outlet of the fourth oil supplementing check valve 54, and an oil outlet of the fourth damping check valve 73 is communicated with a second oil port A2 of the second bidirectional safety valve 71.

Through the arrangement of the first damping module 6 and the second damping module 7, the hydraulic system can be prevented from supplying oil to the low-pressure side when the over-torque of the rudder propeller occurs. When the hydraulic system is subjected to over-torque due to external factors, the high-pressure side oil line pressure exceeds the set value of the first two-way relief valve 61 or the second two-way relief valve 71, and the first two-way relief valve 61 or the second two-way relief valve 71 is opened to overflow, so that the safety of the whole hydraulic system is ensured.

Referring to fig. 1, a partition plate 40 for dividing the oil tank 4 into a first chamber S1 and a second chamber S2 is arranged in the oil tank 4, the top of the first chamber S1 is communicated with the top of the second chamber S2, an oil drain port T of the first motor M1 is communicated with the first chamber S1, an oil drain port T of the second motor M2 is communicated with the second chamber S2, an oil inlet G of the first variable pump assembly 1 is communicated with the first chamber S1, an oil inlet G of the second variable pump assembly 2 is communicated with the second chamber S2, and an oil drain port T of the fault isolation module 3 is communicated with the first chamber S1 or the second chamber S2.

In the present embodiment, the height of the partition 40 may be set to 3/4 of the highest oil level in the oil tank 4. The oil above the partition plate 40 is the public oil, and after the public oil is used up, the rest oil can be respectively used as two independent oil sources to be respectively supplied to the two corresponding variable pump assemblies in the first chamber S1 and the second chamber S2. When the hydraulic system normally operates and oil leakage occurs, a variable pump assembly can drive the motor to continue to operate.

Referring to fig. 1, the hydraulic system further comprises a first level relay 81, a second level relay 82 and a third level relay 83.

The first level relay 81 is used to detect the level of the liquid in the first chamber S1, the second level relay 82 is used to detect the level of the liquid in the second chamber S2, and the third level relay 83 is used to detect the level of the liquid at the top of the tank 4.

Optionally, the first level relay 81, the second level relay 82 and the third level relay 83 are all electromagnetic relays having an alarm function. Wherein the third level relay 83 is a level relay common to the entire hydraulic system.

For example, if the level of the liquid in the tank 4 is lower than h1 due to a small leakage of the hydraulic system, the third liquid level relay 83 will send a low liquid level alarm signal to remind the ship operator that the system needs to be checked and the oil in the tank needs to be replenished.

When the liquid level in the first chamber S1 (or the second chamber S2) is lower than h2, the first liquid level relay 81 (or the second liquid level relay 82) gives an alarm, and 0 < h2 < h 1.

Further, the hydraulic system further comprises a control module, and the control module is configured to control the first sequence valve 31, the second sequence valve 32, the first two-position four-way valve 33, the second two-position four-way valve 34, and the fault isolation valve 35 to be closed according to detection results of the first pressure switch 13, the second pressure switch 23, the first liquid level relay 81, the second liquid level relay 82, and the third liquid level relay 83.

For example, when there is a large leakage in the hydraulic system, the pressure of the oil pumped by the first auxiliary pump 121 (or the second auxiliary pump 221) is reduced, and the oil cannot be continuously supplied to the closed circuit. When the first pressure switch 13 (or the second pressure switch 23) detects that the pressure continuously drops below the set value (for example, 17MPa) for a period of time, the control module can determine that a fault occurs in the oil path between the first variable pump assembly 1 and the first motor M1 (or in the oil path between the second variable pump assembly 2 and the second motor M2) according to the detection result of the first pressure switch 13 (or the second pressure switch 23), and at this time, the control module controls the first sequence valve 31 (or the second sequence valve 32) to be in the first state and controls the fault isolation valve 35 to be in the second state, so as to divide the hydraulic system into two independent systems. Meanwhile, the control module controls the first two-position four-way valve 33 (or the second two-position four-way valve 34) to be in the first state, and controls the first variable pump assembly 1 (or the second variable pump assembly 2) to stop working, so that the first motor M1 (or the second motor M2) is in a free wheel working condition.

When there is a small leak in the hydraulic system, the pressure of the oil pumped by the first auxiliary pump 121 (or the second auxiliary pump 221) does not immediately drop below the set value, the first pressure switch 13 (or the second pressure switch 23) does not alarm, but the oil in the first chamber S1 (or the second chamber S2) of the oil tank 40 is slowly sucked empty. When the first liquid level relay 81 (or the second liquid level relay 82) detects that the liquid level in the first chamber S1 (or the second chamber S2) is lower than the set value, the control module can determine the oil path between the first variable pump assembly 1 and the first motor M1 (or the oil path between the second variable pump assembly 2 and the second motor M2) according to the detection result of the first liquid level relay 81 (or the second liquid level relay 82). The control module now controls the first sequence valve 31 (or the second sequence valve 32) to be in the first state and the fault isolation valve 35 to be in the second state to divide the hydraulic system into two independent systems. Meanwhile, the control module controls the first two-position four-way valve 33 (or the second two-position four-way valve 34) to be in the first state, and controls the first variable pump assembly 1 (or the second variable pump assembly 2) to stop working, so that the first motor M1 (or the second motor M2) is in a free wheel working condition.

Referring to fig. 1, the hydraulic system may further include a check valve 911, a check valve 912, a first cooler 913, and a first oil return filter 914.

An oil inlet of the check valve 911 is communicated with the fifth oil port E of the first variable pump assembly 1, and an oil outlet of the check valve 911 is communicated with an oil inlet of the first cooler 913. An oil inlet of the check valve 912 is communicated with an oil drainage port of the first motor M1, and an oil outlet of the check valve 912 is communicated with an oil inlet of the first cooler 913. The oil outlet of the first cooler 913 is communicated with the oil inlet of the first oil return filter 914, and the oil outlet of the first oil return filter 914 is communicated with the first chamber S1.

The check valve 911 and the check valve 912 are provided to prevent the oil in the first chamber S1 from flowing backward. By providing the first cooler 913, the oil may be cooled before flowing to the first chamber S1. The oil may be filtered before flowing to the first chamber S1 by providing a first oil return filter 914.

Optionally, the hydraulic system may further include a check valve 921, a check valve 922, a second cooler 923, and a second oil return filter 924.

An oil inlet of the check valve 921 is communicated with the fifth oil port E of the second variable pump assembly 2, and an oil outlet of the check valve 921 is communicated with an oil inlet of the second cooler 923. An oil inlet of the check valve 922 is communicated with an oil drainage port of the second motor M2, and an oil outlet of the check valve 922 is communicated with an oil inlet of the second cooler 923. The oil outlet of the second cooler 923 is communicated with the oil inlet of the second oil return filter 924, and the oil outlet of the second oil return filter 924 is communicated with the second chamber S2.

The oil in the second chamber S2 can be prevented from flowing backward by providing the

check valves

921 and 922. By providing the second cooler 923, the oil may be cooled before flowing to the second chamber S2. The oil may be filtered before flowing to the second chamber S1 by providing a second oil return filter 924.

Optionally, the hydraulic system may further comprise a first temperature sensor 931 and a second temperature sensor 932. The first temperature sensor 931 is configured to detect a temperature of the oil in the first chamber S1, and the second temperature sensor 932 is configured to detect a temperature of the oil in the second chamber S2.

Optionally, the hydraulic system may further include an air filter 94, and the air filter 94 is connected to the top of the oil tank 4.

It should be noted that, in the present embodiment, the top of the fuel tank 4 is provided with a vent hole (not shown), and an air filter 94 may be disposed in the vent hole for filtering air entering and exiting the fuel tank 4.

Optionally, the bottom of the oil tank 4 is further communicated with an oil drain pipeline, and the oil drain ball valve 41 is arranged on the oil drain pipeline and used for controlling the discharge of oil in the oil tank 4.

The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims

1. A hydraulic system of a pod thruster, characterized in that the hydraulic system comprises: the device comprises a driving pump module (X), a motor module (Y), an oil tank (4) and a flushing module (10);

the driving pump module (X) is provided with a first oil port (X1), a second oil port (X2) and an oil inlet (X3), the motor module (Y) is provided with a first oil port (Y1), a second oil port (Y2), a flushing oil port (Y3) and an oil drainage port (Y4), the first oil port (X1) of the driving pump module (X) is communicated with the first oil port (X1) of the motor module (Y), the second oil port (X2) of the driving pump module (X) is communicated with the second oil port (Y2) of the motor module (Y), and the oil inlet (X3) of the driving pump module (X) and the oil drainage port (Y4) of the motor module (Y) are both communicated with the oil tank (4);

the flushing module (10) comprises: the oil tank is characterized by comprising a flushing pump (100), a first detection unit (101), a second detection unit (102) and a flushing motor (103) for driving the flushing pump (100), wherein an oil inlet of the flushing pump (100) is communicated with the oil tank (4), and an oil outlet of the flushing pump (100) is communicated with a flushing oil port (Y3) of the motor module (Y);

the first detection unit (101) has an oil inlet, the oil inlet of the first detection unit (101) is connected to an oil path where an oil outlet of the flushing pump (100) is communicated with a flushing oil port (Y3) of the motor module (Y), and the first detection unit (101) is configured to give an alarm when the oil pressure at the oil inlet of the first detection unit (101) is lower than a first threshold value;

the second detection unit (102) is provided with an oil inlet, the oil inlet of the second detection unit (102) is connected to an oil path through which an oil outlet of the flushing pump (100) is communicated with a flushing oil port (Y3) of the motor module (Y), and the second detection unit (102) is configured to control the flushing motor (103) to stop working when the oil pressure at the oil inlet of the second detection unit (102) is lower than the first threshold and the duration time exceeds a second threshold.

2. The hydraulic system of a pod thruster of claim 1, wherein the first detection unit (101) comprises: the oil outlet of the flushing pump (100) is communicated with a flushing oil port (Y3) of the motor module (Y), and the oil inlet of the first flushing pressure switch (101a) is connected to an oil path of the flushing pump (100) and the flushing oil port (Y3), and the switch element of the first flushing pressure switch (101a) is connected to the control circuit of the alarm (101 b).

3. The hydraulic system of a pod thruster of claim 1, wherein the second detection unit (102) comprises: a second flushing pressure switch (102a) and a controller (102b), wherein an oil inlet of the second flushing pressure switch (102a) is connected to an oil path communicating an oil outlet of the flushing pump (100) and a flushing oil port (Y3) of the motor module (Y), the controller (102b) is electrically connected with the flushing motor (103) and a switch element of the second flushing pressure switch (102a), and the controller (102b) is configured to control the flushing motor (103) to stop working when the switch element of the second flushing pressure switch (102a) acts and the duration time exceeds the second threshold value.

4. The hydraulic system of a pod thruster of any of claims 1 to 3, wherein the flushing module (10) further comprises a flushing overflow valve (104), a first port of the flushing overflow valve (104) being connected to an oil path where an oil outlet of the flushing pump (100) communicates with a flushing port (Y3) of the motor module (Y), a second port of the flushing overflow valve (104) communicating with the oil tank (4).

5. The hydraulic system of a pod thruster of any of claims 1 to 3, wherein the flushing module (10) further comprises a flushing filter (105), an oil inlet of the flushing filter (105) being in communication with an oil outlet of the flushing pump (100), an oil outlet of the flushing filter (105) being in communication with a flushing oil port (Y3) of the motor module (Y).

6. The hydraulic system of a pod thruster of claim 5, wherein the flushing module (10) further comprises a flushing check valve (106), an oil inlet of the flushing check valve (106) communicating with an oil outlet of the flushing filter (105), an oil outlet of the flushing check valve (106) communicating with a flushing oil port (Y3) of the motor module (Y).

7. The hydraulic system of a pod thruster of any of claims 1 to 3, further comprising a fault isolation module (3), the drive pump module (X) comprising a first variable pump assembly (1) and a second variable pump assembly (2), the motor module (Y) comprising a first motor (M1) and a second motor (M2);

the first variable pump assembly (1) and the second variable pump assembly (2) are respectively provided with a first oil port (A), a second oil port (B) and an oil inlet (G), and the fault isolation module (3) is provided with a first oil port (A1), a second oil port (B1), a third oil port (A2), a fourth oil port (B2), a fifth oil port (C1), a sixth oil port (C2), a seventh oil port (D1), an eighth oil port (D2) and an oil drainage port (T);

a first oil port (A) of the first variable pump assembly (1) is communicated with a first oil port (A1) of the fault isolation module (3), and a second oil port (B) of the first variable pump assembly (1) is communicated with a second oil port (B1) of the fault isolation module (3); a first oil port (A) of the second variable pump assembly (2) is communicated with a third oil port (A2) of the fault isolation module (3), and a second oil port (B) of the second variable pump assembly (2) is communicated with a fourth oil port (B2) of the fault isolation module (3); a fifth oil port (C1) of the fault isolation module (3) is communicated with a first oil port (A) of a first motor (M1), and a seventh oil port (D1) of the fault isolation module (3) is communicated with a second oil port (B) of the first motor (M1); a sixth oil port (C2) of the fault isolation module (3) is communicated with a first oil port (A) of a second motor (M2), and an eighth oil port (D2) of the fault isolation module (3) is communicated with a second oil port (B) of the second motor (M2);

an oil inlet (G) of the first variable pump assembly (1), an oil inlet (G) of the second variable pump assembly (2), an oil drainage port (T) of the fault isolation module (3), an oil drainage port (T) of the first motor (M1) and an oil drainage port (T) of the second motor (M2) are all communicated with the oil tank (4); the fault isolation module (3) comprises a first sequence valve (31), a second sequence valve (32), a first two-position four-way valve (33), a second two-position four-way valve (34) and a fault isolation valve (35);

a first oil port (A) of the first sequence valve (31) is communicated with a first oil port (A1) of the fault isolation module (3), a second oil port (B) of the first sequence valve (31) is communicated with a second oil port (B1) of the fault isolation module (3), a third oil port (C) of the first sequence valve (31) is communicated with a third oil port (C) of the first two-position four-way valve (33), and a fourth oil port (D) of the first sequence valve (31) is communicated with a fourth oil port (D) of the first two-position four-way valve (33);

a first oil port (A) of the second sequence valve (32) is communicated with a third oil port (A2) of the fault isolation module (3), a second oil port (B) of the second sequence valve (32) is communicated with a fourth oil port (B2) of the fault isolation module (3), a third oil port (C) of the second sequence valve (32) is communicated with a third oil port (C) of the second two-position four-way valve (34), and a fourth oil port (D) of the second sequence valve (32) is communicated with a fourth oil port (D) of the second two-position four-way valve (34);

a first oil port (A) and a second oil port (B) of the first two-position four-way valve (33), a first oil port (A) and a second oil port (B) of the second two-position four-way valve (34) are communicated with an oil drainage port (T) of the fault isolation module (3), a third oil port (C) of the first two-position four-way valve (33) is communicated with a fifth oil port (C1) of the fault isolation module (3), a fourth oil port (D) of the first two-position four-way valve (33) is communicated with a seventh oil port (D1) of the fault isolation module (3), a third oil port (C) of the second two-position four-way valve (34) is communicated with a sixth oil port (C2) of the fault isolation module (3), and a fourth oil port (D) of the second two-position four-way valve (34) is communicated with an eighth oil port (D2) of the fault isolation module (3);

the first oil port (A) of the fault isolation valve (35) is respectively communicated with the third oil port (C) of the first sequence valve (31) and the third oil port (C) of the first two-position four-way valve (33), the second oil port (B) of the fault isolation valve (35) is respectively communicated with the fourth oil port (D) of the first sequence valve (31) and the fourth oil port (D) of the first two-position four-way valve (33), the third oil port (C) of the fault isolation valve (35) is respectively communicated with the third oil port (C) of the second sequence valve (32) and the third oil port (C) of the second two-position four-way valve (34), and the fourth oil port (D) of the fault isolation valve (35) is respectively communicated with the fourth oil port (D) of the second sequence valve (32) and the fourth oil port (D) of the second two-position four-way valve (34).

8. The hydraulic system of a pod thruster of claim 7, wherein the first variable pump assembly (1) comprises a first servo control mechanism (11), a first variable pump (12) and a first pressure switch (13); a first auxiliary pump (121) is integrated inside the first variable pump (12), an oil outlet (A) of the first variable pump (12) is communicated with a first oil port (A) of the first variable pump assembly (1), and an oil outlet (B) of the first variable pump (12) is communicated with a second oil port (B) of the first variable pump assembly (1); an oil inlet (D) of the first auxiliary pump (121) is communicated with an oil inlet (G) of the first variable pump assembly (1); an oil inlet of the first pressure switch (13) is communicated with an oil outlet (C) of the first auxiliary pump (121).

9. The hydraulic system of a pod thruster of claim 8, wherein the second variable pump assembly (2) comprises a second servo control (21), a second variable pump (22) and a second pressure switch (23); a second auxiliary pump (221) is integrated inside the second variable pump (22), an oil outlet (A) of the second variable pump (22) is communicated with a first oil port (A) of the second variable pump assembly (2), and an oil outlet (B) of the second variable pump (22) is communicated with a second oil port (B) of the second variable pump assembly (2); the oil inlet (D) of the second auxiliary pump (221) is communicated with the oil inlet (G) of the second variable pump assembly (2); an oil inlet of the second pressure switch (23) is communicated with an oil outlet (C) of the second auxiliary pump (221).

10. The hydraulic system of a pod thruster of claim 9, further comprising an oil replenishment distributor module (5), the oil replenishment distributor module (5) comprising a first oil replenishment check valve (51), a second oil replenishment check valve (52), a third oil replenishment check valve (53) and a fourth oil replenishment check valve (54); ) The first variable pump assembly (1) is provided with a fourth oil port (D), the oil outlet (C) of the first auxiliary pump (121) is communicated with the fourth oil port (D) of the first variable pump assembly (1), the second variable pump assembly (2) is provided with a fourth oil port (D), and the oil outlet (C) of the second auxiliary pump (221) is communicated with the fourth oil port (D) of the second variable pump assembly (2); an oil inlet of the first oil supplementing check valve (51) is communicated with a fourth oil port (D) of the first variable pump assembly (1), and an oil outlet of the first oil supplementing check valve (51) is respectively communicated with a first oil port (A) and a second oil port (B) of the first motor (M1); an oil inlet of the second oil supplementing check valve (52) is communicated with a fourth oil port (D) of the second variable pump assembly (2), and an oil outlet of the second oil supplementing check valve (52) is respectively communicated with a first oil port (A) and a second oil port (B)) of the first motor (M1); an oil inlet of the third oil supplementing check valve (53) is communicated with a fourth oil port (D) of the first variable pump assembly (1), and an oil outlet of the third oil supplementing check valve (53) is respectively communicated with a first oil port (A) and a second oil port (B)) of the second motor (M2); ) An oil inlet of the fourth oil supplementing check valve (54) is communicated with a fourth oil port (D) of the second variable pump assembly (2), and an oil outlet of the fourth oil supplementing check valve (54) is respectively communicated with a first oil port (A) and a second oil port (B)) of the second motor (M2).