Water jet propulsion device with synchronously matched and adjustable screw pitches of movable blades and guide blades

Abstract

The invention relates to a water jet propulsion device with adjustable screw pitches of movable blades and guide blades in synchronous matching. The water jet propulsion device comprises a regulation and control system and a hydraulic pump station, and four oil ways are arranged in an impeller shaft; the regulation and control system obtains the current navigation working condition through a sensor, and calculates and analyzes the pitch of the moving blade and the guide blade of the water jet propulsion efficient area matched with the current navigation working condition; the hydraulic pump station provides a power source for the movable blade part; the hydraulic pump station provides a power source for the guide vane part; according to the current operation working condition of the water jet propulsion device, the synchronous driving mechanism and the executing mechanism for driving the moving blade pitch change, and meanwhile, the guide blade pitch executing mechanism is driven to change the pitch, so that the pitch change of the moving blade and the guide blade enables the water jet propulsion device to be matched with the current navigation working condition; therefore, the high-efficiency area of the water jet propulsion device is widened, the output power of the engine is utilized to the maximum extent to operate in the high-efficiency area, and energy conservation and efficiency improvement of the engine of the water jet propulsion device under variable working conditions are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship propulsion, and in particular to a water jet propulsion device with synchronously matched and adjustable pitches of moving blades and guide vanes. Background Art

[0002] At present, water jet propulsion has developed into the mainstream propulsion method for high-performance ships. The propulsion efficiency of water jet propulsion devices is very high at high speeds, and the efficiency of water jet propulsion devices is high only within the design speed range, especially at low speeds and low speeds. Therefore, under different working conditions, it is necessary to adjust the helical angle of the blades to improve the efficiency of the water jet propulsion device. The guide vanes and moving blades are designed to match each other, so the adjustable blade pitch of the water jet propulsion device must also be synchronously matched and adjusted with the moving blades and guide vanes to achieve efficient operation of the water jet propulsion device. At present, the technology of adjustable pitch propellers is relatively mature, but the technology of adjustable pitch of water jet propulsion devices currently focuses on the adjustment of moving blades. Some industrial axial flow pumps also adopt the structural design of adjustable guide vane pitch, but the synchronous matching adjustment of moving blades and guide vanes is not considered. Therefore, the technical problem of synchronous adjustable blade pitch of moving blades and guide vanes of water jet propulsion devices needs to be solved. Summary of the invention

[0003] Aiming at the poor adaptability of current water jet propulsion devices under variable working conditions and the unresolved problem of the current technology of synchronously adjustable moving blades and guide vanes, a water jet propulsion device with synchronously matched adjustable pitch of moving blades and guide vanes is proposed.

[0004] The technical solution of the present invention is: a water jet propulsion device with synchronously matched and adjustable pitches of moving blades and guide vanes, comprising a hydraulic pump station, an impeller shaft, a moving blade part, and a guide vane part;

[0005] The moving blade part is fixedly sleeved on the impeller shaft, the guide vane part is rotatably sleeved on the impeller shaft, the moving blade part is provided with moving blade blades; the guide vane part is provided with guide vane blades;

[0006] The plunger pump of the hydraulic pump station is connected to the first oil circuit of the moving blade part, the second oil circuit of the moving blade part, the first oil circuit of the guide vane part and the second oil circuit of the guide vane part; the first oil circuit of the moving blade part, the second oil circuit of the moving blade part, the first oil circuit of the guide vane part and the second oil circuit of the guide vane part are arranged inside the impeller shaft;

[0007] The first oil circuit of the moving blade part is connected to the first oil circuit inside the moving blade part, and the second oil circuit of the moving blade part is connected to the second oil circuit inside the moving blade part. The hydraulic pump station provides an adjustment power source for the moving blade part through the first oil circuit of the moving blade part and the first oil circuit inside the moving blade part, the second oil circuit of the moving blade part and the second oil circuit inside the moving blade part, so as to adjust the pitch of the moving blade of the moving blade part;

[0008] The first oil circuit of the guide vane part is connected to the first oil circuit inside the guide vane part, and the second oil circuit of the guide vane part is connected to the second oil circuit inside the guide vane part. The hydraulic pump station provides an adjustment power source for the guide vane part through the first oil circuit of the guide vane part and the first oil circuit inside the guide vane part, the second oil circuit of the guide vane part and the second oil circuit inside the guide vane part, thereby adjusting the pitch of the guide vane blades of the guide vane part, and realizing the control of the rotation angle and forward and reverse rotation.

[0009] Preferably, the impeller portion is provided with an impeller hub, the impeller hub is fixedly sleeved on the impeller shaft, the impeller hub is an internal hollow structure, the impeller blades are arranged on the outer surface of the impeller hub, and the tips of the impeller blades are wrapped with a impeller shell on the outside.

[0010] Preferably, a moving blade hydraulic motor is provided inside the moving blade hub, the first oil circuit inside the moving blade and the second oil circuit inside the moving blade are connected to the moving blade hydraulic motor, the moving blade hydraulic motor is connected to the moving blade rotating gear set, the moving blade rotating gear set is coaxially connected to the moving blade large bevel gear, the moving blade large bevel gear is connected to the moving blade small bevel gear, and the moving blade small bevel gear is connected to the root of the moving blade.

[0011] Preferably, the guide vane part is provided with a guide vane hub, which is rotatably mounted on the impeller shaft, the guide vane hub is an internal hollow structure, the outer surface of the guide vane hub is provided with guide vane blades, and the outer side of the tip of the guide vane blade is wrapped with a guide vane shell.

[0012] Preferably, a guide vane hydraulic motor is provided inside the guide vane hub, the first oil circuit inside the guide vane and the second oil circuit inside the guide vane are connected to the guide vane hydraulic motor, the guide vane hydraulic motor is connected to the guide vane rotating gear set, the guide vane rotating gear set is coaxially connected to the guide vane large bevel gear, the guide vane large bevel gear is connected to the guide vane small bevel gear, and the guide vane small bevel gear is connected to the root of the guide vane blade.

[0013] Preferably, a guide vane shell support structure is provided at the tip of the guide vane blade, and the guide vane shell is provided with a bearing at a position corresponding to the guide vane shell support structure, and one end of the guide vane shell support structure away from the guide vane blade is in contact with the bearing, so that the guide vane shell forms radial support for the guide vane shell support structure.

[0014] Preferably, a flange cover plate and a skeleton seal are respectively provided between the guide vane hub and the impeller hub.

[0015] Preferably, an oil separator ring is provided between the first oil passage of the guide vane portion and the first oil passage inside the guide vane portion; and an oil separator ring is provided between the second oil passage of the guide vane portion and the second oil passage inside the guide vane portion.

[0016] Preferably, an end face seal is provided between the oil separator ring and the impeller shaft.

[0017] Preferably, it also includes a control system, which includes a control module, a flow sensor and a speed sensor. The control module analyzes the current operating conditions based on the speed, flow and other data collected by the flow sensor and the speed sensor, and calculates the pitch of the moving blades and guide vanes that match the current operating conditions.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a water jet propulsion device with adjustable synchronous matching of the pitch of moving blades and guide vanes. The present invention can, according to the current operating condition of the water jet propulsion device, drive the actuator of the pitch of the moving blades to achieve pitch change through a synchronous driving mechanism, and at the same time drive the guide vane pitch actuator to achieve pitch change, so that the pitch change of the moving blades and guide vanes makes the water jet propulsion device match the current navigation condition, and realizes the water jet propulsion device to operate at a higher efficiency, thereby widening the high-efficiency zone of the water jet propulsion device, making the maximum use of the output power of the engine to operate in the high-efficiency zone, and realizing energy saving and efficiency improvement of the water jet propulsion device and the engine under variable conditions. The structure proposed by the present invention is scientific, reasonable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a water jet propulsion device with adjustable synchronous matching of the pitch of the moving blades and the guide vanes of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of part I;

[0021] Figure 3 for Figure 1 A partial enlarged view of part II;

[0022] Figure 4 It is a schematic diagram of a control system of a water jet propulsion device with adjustable synchronous matching of the pitch of the moving blades and the guide vanes of the present invention;

[0023] Figure 5 This is a schematic diagram of the pitch matching relationship between the moving blade and the guide vane of the present invention;

[0024] Figure 6 The flow chart of synchronous adjustment of the pitch of the moving blade and the guide vane of the present invention is

[0025] Figure 7 Schematic diagram of widening the high-efficiency range of a water jet propulsion device with adjustable pitch.

[0026] In the figure, the component names corresponding to the reference numerals are as follows:

[0027] 1. Hydraulic pump station; 11. First oil circuit of moving blade; 12. Second oil circuit of moving blade; 13. First oil circuit of guide vane; 14. Second oil circuit of guide vane; 15. Oil distributor ring; 151. End seal; 2. Impeller shaft; 3. Moving blade; 31. Moving blade housing; 32. Moving blade blade; 33. Small bevel gear of moving blade; 34. Large bevel gear of moving blade; 35. Rotating gear set of moving blade; 36. Hydraulic motor of moving blade; 37. Moving blade hub; 38. First oil circuit inside moving blade; 39. Moving blade The second internal oil circuit; 4. Guide vane section; 41. Guide vane housing; 411. Guide vane housing support structure; 42. Guide vane blades; 43. Small bevel gear of guide vane section; 44. Large bevel gear of guide vane section; 45. Rotary gear set of guide vane section; 46. Hydraulic motor of guide vane section; 47. Guide vane hub; 48. The first internal oil circuit of guide vane section; 49. The second internal oil circuit of guide vane section; 5. Flange cover plate; 6. Skeleton seal; 7. Control system; 71. Control module; 72. Flow sensor; 73. Speed ​​sensor. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0029] refer to Figure 1 As shown, the present invention provides a water jet propulsion device with synchronous matching and adjustable pitch of moving blades and guide vanes, comprising a hydraulic pump station 1, an impeller shaft 2, a moving blade part 3, and a guide vane part 4; the hydraulic pump station 1 is provided with a plunger pump solenoid valve for adjusting the opening of the plunger pump, the moving blade part 3 is fixedly sleeved on the impeller shaft 2, and the moving blade part 3 can rotate with the impeller shaft 2, the guide vane part 4 is rotatably sleeved on the impeller shaft 2, and the guide vane part 4 does not rotate with the impeller shaft 2;

[0030] The plunger pump of the hydraulic pump station 1 is connected to the first oil circuit 11 of the moving blade part, the second oil circuit 12 of the moving blade part, the first oil circuit 13 of the guide vane part, and the second oil circuit 14 of the guide vane part. The first oil circuit 11 of the moving blade part, the second oil circuit 12 of the moving blade part, the first oil circuit 13 of the guide vane part, and the second oil circuit 14 of the guide vane part are arranged inside the impeller shaft 2;

[0031] The first oil path 11 of the moving blade part is connected to the first oil path 38 inside the moving blade part, and the second oil path 12 of the moving blade part is connected to the second oil path 39 inside the moving blade part. The hydraulic pump station 1 provides an adjustment power source for the moving blade part 3 through the first oil path 11 of the moving blade part and the first oil path 38 inside the moving blade part, the second oil path 12 of the moving blade part and the second oil path 39 inside the moving blade part;

[0032] The first oil path 13 of the guide vane part is connected to the first oil path 48 inside the guide vane part, and the second oil path 14 of the guide vane part is connected to the second oil path 49 inside the guide vane part. The hydraulic pump station 1 provides the guide vane part 4 with an adjustment power source through the first oil path 13 of the guide vane part, the first oil path 48 inside the guide vane part, the second oil path 14 of the guide vane part, and the second oil path 49 inside the guide vane part.

[0033] The impeller 3 includes an impeller hub 37, which is fixedly sleeved on the impeller shaft 2, and the impeller blades 32 are arranged on the outer surface of the impeller hub 37. The impeller housing 31 is wrapped and arranged on the outer side of the tip of the impeller blade 32. The impeller hub 37 is an internal hollow structure. The impeller hub 37 is provided with a hydraulic motor 36 for the impeller. The first oil path 38 inside the impeller and the second oil path 39 inside the impeller are connected to the hydraulic motor 36 for the impeller. The hydraulic pump station 1 drives the impeller through the first oil path 11 and the first oil path 38 inside the impeller, the second oil path 12 and the second oil path 39 inside the impeller. The blade hydraulic motor 36 is connected to the blade rotary gear set 35, thereby driving the blade rotary gear set 35. The blade rotary gear set 35 is coaxially connected to the blade large bevel gear 34, thereby driving the blade large bevel gear 34 to rotate. The blade large bevel gear 34 is connected to the blade small bevel gear 33, thereby driving the blade small bevel gear 33 to rotate. The blade small bevel gear 33 passes through the outer surface of the blade hub 37 and is connected to the root of the blade 32. The blade small bevel gear 33 drives the root of the blade 32 to rotate, thereby realizing the change of the pitch of the blade 32.

[0034] The guide vane part 4 includes a guide vane hub 47, which is rotatably sleeved on the impeller shaft 2, and the guide vane blades 42 are arranged on the outer surface of the guide vane hub 47. The guide vane housing 41 is wrapped and arranged on the outer side of the tip of the guide vane blade 42. The guide vane hub 47 is an internal hollow structure. A guide vane hydraulic motor 46 is arranged inside the guide vane hub 47. The first oil circuit 48 inside the guide vane part and the second oil circuit 49 inside the guide vane part are connected to the guide vane hydraulic motor 46. The hydraulic pump station 1 is driven by the first oil circuit 13 of the guide vane part and the first oil circuit 48 inside the guide vane part, the second oil circuit 14 of the guide vane part and the second oil circuit 49 inside the guide vane part. The guide vane hydraulic motor 46 is connected to the guide vane rotary gear set 45, thereby driving the guide vane rotary gear set 45. The guide vane rotary gear set 45 is coaxially connected to the guide vane large bevel gear 44, thereby driving the guide vane large bevel gear 44 to rotate. The guide vane large bevel gear 44 is connected to the guide vane small bevel gear 43, thereby driving the guide vane small bevel gear 43 to rotate. The guide vane small bevel gear 43 passes through the outer surface of the guide vane hub 47 and is connected to the root of the guide vane blade 42. The guide vane small bevel gear 43 drives the root of the guide vane blade 42 to rotate, thereby realizing the change of the pitch of the guide vane blade 42.

[0035] A guide vane housing support structure 411 is provided at the tip of the guide vane blade 42. When the guide vane blade 42 changes its pitch, the tip rotates around the guide vane housing support structure 411. The guide vane housing 41 is provided with a bearing at a position corresponding to the guide vane housing support structure 411. One end of the guide vane housing support structure 411 away from the guide vane blade 42 is in contact with the bearing, so that the guide vane housing 41 forms radial support for the guide vane housing support structure 411, playing a role of restraining support.

[0036] The guide vane hub 47 is provided with a flange cover plate 5 on one side adjacent to the impeller hub 37, and a skeleton seal 6 is provided near the impeller shaft 2 to achieve sealing between the guide vane hub 47 and the impeller hub 37;

[0037] The first oil passage 11 of the moving blade part, the second oil passage 12 of the moving blade part, the first oil passage 13 of the guide vane part, the second oil passage 14 of the guide vane part, the first oil passage 38 inside the blade part, the second oil passage 39 inside the moving blade part, the first oil passage 48 inside the guide vane part, and the second oil passage 49 inside the guide vane part are all hard oil pipes, which can withstand greater pressure and impact, and ensure the stable operation of the oil passage system;

[0038] refer to Figure 2 As shown, an oil separator ring 15 is provided between the first oil passage 13 of the guide vane portion and the first oil passage 48 inside the guide vane portion. The hydraulic oil in the first oil passage 13 of the guide vane portion passes through the oil separator ring 15 and then reaches the first oil passage 48 inside the guide vane portion, and is finally delivered to the hydraulic motor 46 of the guide vane portion.

[0039] An oil separator 15 is also provided between the second oil passage 14 of the guide vane and the second oil passage 49 inside the guide vane. The hydraulic oil in the second oil passage 14 of the guide vane passes through the oil separator 15 and then reaches the second oil passage 49 inside the guide vane, and is finally delivered to the hydraulic motor 46 of the guide vane.

[0040] The dynamic and static separation of the rotating first oil path 13 and the second oil path 14 of the guide vane and the static first oil path 48 and the second oil path 49 inside the guide vane can be achieved, thereby realizing the transportation of hydraulic oil;

[0041] End face seals 151 are arranged around the contact part between the oil separator ring 15 and the impeller shaft 2. The contact surface of the end face seal 151 has an appropriate sealing pressure, which can prevent leakage and reduce friction and wear.

[0042] refer to Figure 3 As shown, the hydraulic oil in the first oil passage 11 and the second oil passage 12 of the moving blade part directly flows to the first oil passage 38 and the second oil passage 39 inside the moving blade part, and then is delivered to the hydraulic motor 36 of the moving blade part;

[0043] refer to Figure 4As shown, the water jet propulsion device with adjustable pitch of the moving blade and the guide vane synchronously matches also includes a control system 7, the control system 7 includes a control module 71, a flow sensor 72 and a speed sensor 73, the control module 71 analyzes the current working condition according to the data such as the speed and flow collected by the flow sensor 72 and the speed sensor 73, and calculates the moving blade and guide vane pitches matching the current working condition;

[0044] The beneficial effects are as follows: the present invention can, according to the current operating condition of the water jet propulsion device, drive the actuator of the pitch of the moving blade 32 to achieve pitch change through the synchronous driving mechanism, and at the same time drive the pitch actuator of the guide vane 42 to achieve pitch change, so that the pitch change of the moving blade and the guide vane makes the water jet propulsion device match the current navigation condition, and realize the water jet propulsion device to operate at a higher efficiency, thereby widening the high-efficiency zone of the water jet propulsion device, making the maximum use of the output power of the engine to operate in the high-efficiency area, and realizing energy saving and efficiency improvement of the water jet propulsion device and the engine under variable conditions. The structure proposed by the present invention is scientific, reasonable and reliable.

[0045] It should be noted that the orientations or positional relationships indicated by the above-mentioned terms "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. "Multiple" means two or more. "Installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection.

[0046] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A water jet propulsion device with adjustable synchronous matching of the pitch of the moving blades and the guide vanes, characterized in that: It comprises a hydraulic pump station (1), an impeller shaft (2), a moving blade part (3), and a guide vane part (4); The moving blade part (3) is fixedly sleeved on the impeller shaft (2), and the guide blade part (4) is rotatably sleeved on the impeller shaft (2). The moving blade part (3) is provided with moving blade blades (32), and the guide blade part (4) is provided with guide blade blades (42). The plunger pump of the hydraulic pump station (1) is connected to the first oil circuit (11) of the moving blade section, the second oil circuit (12) of the moving blade section, the first oil circuit (13) of the guide vane section, and the second oil circuit (14) of the guide vane section; the first oil circuit (11) of the moving blade section, the second oil circuit (12) of the moving blade section, the first oil circuit (13) of the guide vane section, and the second oil circuit (14) of the guide vane section are arranged inside the impeller shaft (2); The first oil circuit (11) of the moving blade section is connected to the first oil circuit (38) inside the moving blade section, and the second oil circuit (12) of the moving blade section is connected to the second oil circuit (39) inside the moving blade section. The hydraulic pump station (1) provides an adjustment power source for the moving blade section (3) through the first oil circuit (11) of the moving blade section and the first oil circuit (38) inside the moving blade section, and the second oil circuit (12) of the moving blade section and the second oil circuit (39) inside the moving blade section, thereby adjusting the pitch of the moving blades (32) of the moving blade section (3); The first oil circuit (13) of the guide vane part is connected to the first oil circuit (48) inside the guide vane part, and the second oil circuit (14) of the guide vane part is connected to the second oil circuit (49) inside the guide vane part. The hydraulic pump station (1) provides an adjustment power source for the guide vane part (4) through the first oil circuit (13) of the guide vane part and the first oil circuit (48) inside the guide vane part, the second oil circuit (14) of the guide vane part and the second oil circuit (49) inside the guide vane part, thereby adjusting the pitch of the guide vane blades (42) of the guide vane part (4), and realizing the control of the rotation angle and the forward and reverse rotation.

2. The water jet propulsion device with synchronously matched and adjustable pitch of the moving blades and the guide vanes according to claim 1 is characterized in that: The impeller portion (3) is provided with an impeller hub (37), which is fixedly sleeved on the impeller shaft (2), and the impeller hub (37) is an internal hollow structure. The impeller blades (32) are arranged on the outer surface of the impeller hub (37), and the outer side of the tips of the impeller blades (32) is wrapped with a impeller shell (31).

3. The water jet propulsion device with synchronously matched and adjustable pitch of moving blades and guide vanes according to claim 2 is characterized in that: A moving blade hydraulic motor (36) is provided inside the moving blade hub (37); a first oil circuit (38) inside the moving blade and a second oil circuit (39) inside the moving blade are connected to the moving blade hydraulic motor (36); the moving blade hydraulic motor (36) is connected to a moving blade rotary gear set (35); the moving blade rotary gear set (35) is coaxially connected to a large bevel gear (34) of the moving blade; the large bevel gear (34) of the moving blade is connected to a small bevel gear (33) of the moving blade; and the small bevel gear (33) of the moving blade is connected to the root of the moving blade (32).

4. The water jet propulsion device with synchronously matched and adjustable pitch of moving blades and guide vanes according to claim 1 is characterized in that: The guide vane portion (4) is provided with a guide vane hub (47), which is rotatably sleeved on the impeller shaft (2), the guide vane hub (47) being an internal hollow structure, the outer surface of the guide vane hub (47) being provided with guide vane blades (42), and the outer side of the tip of the guide vane blade (42) being wrapped with a guide vane housing (41).

5. The water jet propulsion device with adjustable synchronous matching of the moving blade and the guide vane pitch according to claim 4, characterized in that: A guide vane hydraulic motor (46) is arranged inside the guide vane hub (47); a first oil circuit (48) inside the guide vane and a second oil circuit (49) inside the guide vane are connected to the guide vane hydraulic motor (46); the guide vane hydraulic motor (46) is connected to a guide vane rotary gear set (45); the guide vane rotary gear set (45) is coaxially connected to a large bevel gear (44) of the guide vane; the large bevel gear (44) of the guide vane is connected to a small bevel gear (43) of the guide vane; and the small bevel gear (43) of the guide vane is connected to the root of the guide vane blade (42).

6. The water jet propulsion device with synchronously matched and adjustable pitch of moving blades and guide vanes according to claim 5, characterized in that: A guide vane casing support structure (411) is provided at the tip of the guide vane blade (42); the guide vane casing (41) is provided with a bearing at a position corresponding to the guide vane casing support structure (411); an end of the guide vane casing support structure (411) away from the guide vane blade (42) is in contact with the bearing, so that the guide vane casing (41) forms radial support for the guide vane casing support structure (411).

7. The water jet propulsion device with synchronously matched and adjustable pitch of moving blades and guide vanes according to claim 1, characterized in that: A flange cover plate (142) and a skeleton seal (6) are respectively provided between the guide impeller hub (47) and the impeller hub (37).

8. The water jet propulsion device with synchronously matched and adjustable pitches of moving blades and guide vanes according to claim 1, characterized in that: An oil separator ring (15) is provided between the first oil passage (13) of the guide vane portion and the first oil passage (48) inside the guide vane portion; and an oil separator ring (15) is provided between the second oil passage (14) of the guide vane portion and the second oil passage (49) inside the guide vane portion.

9. The water jet propulsion device with synchronously matched and adjustable pitch of moving blades and guide vanes according to claim 8, characterized in that: An end face seal (151) is provided between the oil separator ring (15) and the impeller shaft (2).

10. The water jet propulsion device with synchronously matched and adjustable pitches of moving blades and guide vanes according to claim 1, characterized in that: The invention also includes a control system (7), wherein the control system (7) includes a control module (71), a flow sensor (72) and a speed sensor (73). The control module (71) analyzes the current working condition based on data such as the speed and flow rate collected by the flow sensor (72) and the speed sensor (73), and calculates the pitch of the moving blades and guide vanes that match the current working condition.

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