Pump jet propeller duct connection

Abstract

The application discloses a pump-jet propeller duct connecting structure, which comprises a connecting flange; the connecting flange is arranged behind the blade of a propeller and comprises a stern flange and a bow flange, and the diameter of the bow flange is larger than that of the propeller; the stern flange and the bow flange are connected through connecting bolts to connect a stern duct and a bow duct together. The connecting flange is arranged behind the propeller blade, the rigidity of the duct near the propeller is improved, the propeller blade is not clamped when the stern duct is deformed, and the safety of a ship is improved.

Description

Technical Field

[0001] The present invention belongs to the field of pump-jet propulsion equipment, and in particular relates to a pump-jet propulsion duct connection structure. Background Art

[0002] In existing ship designs, the outer diameter of the propeller is generally larger than the small end diameter of the pump-jet propulsion duct. To facilitate installation of the propeller within the pump-jet propulsion duct, the duct is typically divided into two sections: the bow and stern. The bow section is installed first, followed by the propeller, and finally the stern section.

[0003] Currently, the traditional domestic duct connection structure uses a connecting flange in the middle of the duct. The stern section of the duct is large and heavy, and the clearance between the stern section and the propeller blades is very small. When the stern section of the duct undergoes significant deformation after being subjected to impact or collision loads, the deformation of the stern section of the duct may cause the duct to become stuck in the propeller blades, causing the ship to lose power and endangering its safety. In addition, the heavy stern section structure greatly increases the difficulty of installation and the machining precision requirements between the bow and stern sections of the duct. Summary of the Invention

[0004] The main purpose of the present invention is to provide a pump-jet propulsion duct connection structure, which moves the connecting flanges of the bow and stern sections as far back as possible, so that the connecting flanges are arranged behind the propeller blades, thereby improving the rigidity of the duct near the propeller. When the stern section duct structure is deformed, it will not get stuck with the propeller blades, thereby improving the safety of the ship.

[0005] The technical solution adopted in the present invention is:

[0006] A pump-jet propeller duct connection structure includes a connection flange;

[0007] The connecting flange is installed behind the blades of the propeller, and includes a stern flange and a bow flange, and the diameter of the bow flange is larger than the diameter of the propeller; the stern flange is installed at the front end of the stern section duct, and the bow flange is installed at the rear end of the bow section duct; the stern flange and the bow flange are connected by connecting bolts, connecting the stern section duct and the bow section duct together to form a duct structure.

[0008] According to the above solution, sealant is provided at the connection seams of the conduit structure.

[0009] According to the above solution, the stern flange is provided with a bolt through hole, the bow flange is provided with a threaded hole, and the threaded hole cannot penetrate the bow flange to ensure sealing.

[0010] According to the above solution, before the connecting bolts are screwed into the stern flange and the bow flange, thread locking glue is applied to ensure sealing.

[0011] According to the above scheme, the stern section duct includes an outer annular surface of the stern section duct surrounded by a fixed skin and a removable skin, and an inner annular surface of the stern section duct surrounded by the fixed skin; stern section annular reinforcement and stern section longitudinal reinforcement are arranged between the outer annular surface of the stern section duct and the inner annular surface of the stern section duct; the removable skin is connected to the fixed skin by a sealant, and the removable skin is placed at the connecting flange; the gap in the stern section duct is filled with a lightweight buoyancy material;

[0012] The inner and outer ring surfaces of the bow section duct are surrounded by fixed skins; bow section annular ribs and bow section longitudinal ribs are arranged between the outer and inner ring surfaces of the bow section duct; and the gaps in the bow section duct are filled with lightweight buoyancy materials.

[0013] According to the above scheme, the width range of the removable skin is exactly the distance between the stern end flange and the stern section ring rib.

[0014] According to the above scheme, stern section longitudinal ribs (reinforcement ribs) are provided between the stern end flange and the stern section ring ribs, ear plates are welded on the stern section longitudinal ribs, and countersunk screws are used to fix the removable skin to the ear plates (the removable skin is reinforced and fixed by countersunk screws), thereby improving the fixing effect of the removable skin.

[0015] According to the above solution, the removable skin is divided into multiple pieces in the circumferential direction, and the connecting seams between adjacent removable skins are filled with sealant.

[0016] According to the above solution, the thickness of the stern flange is 2-3 times the thickness of the stern section annular rib; the thickness of the bow flange is 2-3 times the thickness of the bow section annular rib, thereby improving the rigidity of the duct structure.

[0017] The beneficial effects of the present invention are:

[0018] Under the premise of ensuring smooth installation of the propeller, the present invention arranges the connecting flange behind the propeller blades. That is, the connecting flange is staggered with the propeller blades. When the stern section structure is deformed, the propeller blades will not be stuck, thus ensuring the safety of the ship. The rigidity of the connecting flange is much greater than that of ordinary ring ribs. Arranging the connecting flange near the propeller can greatly increase the rigidity of the duct near the propeller and reduce the deformation of the duct near the propeller.

[0019] The structure is simple and the installation is convenient, which effectively improves the reliability and safety of the catheter;

[0020] The existing duct has the connecting flange set in the middle of the duct, which makes the stern section duct very heavy, making it difficult to dismantle and install the stern section duct and requiring a high processing speed. The present invention moves the connecting flange backward, which can significantly reduce the weight of the stern section duct, reduce the processing precision requirements and the difficulty of dismantling and installing.

[0021] Before screwing in the connecting bolts, thread locking glue needs to be applied. The removable skin and the fixed skin are sealed with sealant to prevent seawater from entering the duct through the connection seam between the removable skin and the fixed skin, ensuring that the entire duct is a watertight structure and buoyancy is guaranteed.

[0022] The connecting flange is placed as close as possible to the tail end of the duct structure, which shortens the length of the stern section duct, reduces the weight of the stern section duct, increases its structural rigidity, and thus reduces deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 1 is a schematic longitudinal section of the upper portion of the pump-jet propulsor duct connection structure;

[0025] Figure 2 yes Figure 1 Enlarged view of middle B;

[0026] Figure 3 yes Figure 2 AA section view in;

[0027] In the figure: 1. Duct structure; 2. Propeller; 3. Stator; 4. Bow section duct; 5. Stern section duct; 6. Stern end flange; 7. Bow end flange; 8. Connecting bolts; 9. Stern section annular reinforcement; 10. Removable skin; 11. Fixed skin; 12. Sealant; 13. Buoyancy material; 14. Countersunk screws; 15. Ear plate; 16. Stern section longitudinal reinforcement. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The pump-jet propulsion system mainly consists of a duct structure 1, a propeller 2, and a stator 3. The duct structure 1 is fixed to the hull through the stator 3, and the propeller 2 is placed in the duct structure 1.

[0030] See also Figure 1-Figure 3The application relates to a pump-jet propeller duct connection structure, which comprises a connection flange; the connection flange is arranged behind the blade of a propeller 2 and as close to the tail end of a duct structure 1 as possible, and comprises a tail end flange 6 and a bow end flange 7, wherein the diameter of the bow end flange 7 is larger than that of the propeller 2. The tail end flange 6 is arranged at the front end of a tail section duct 5, and bolt through holes are formed in the tail end flange 6; the bow end flange 7 is arranged at the rear end of a bow section duct 4, and threaded holes are formed in the bow end flange 7, and the threaded holes cannot penetrate the bow end flange 7 to ensure sealing. The tail end flange 6 and the bow end flange 7 are connected through connection bolts 7; the connection bolts 7 connect the tail section duct 5 and the bow section duct 4 together to form the duct structure 1. Before the connection bolts 8 are screwed into the tail end flange 6 and the bow end flange 7, thread locking glue is applied to ensure sealing.

[0031] The tail section duct 5 comprises a tail section duct outer ring surface surrounded by a fixed skin 11 and a detachable skin 10, and a tail section duct inner ring surface surrounded by the fixed skin 11; the tail section duct outer ring surface and the tail section duct inner ring surface are connected through a tail section ring rib 9 and a tail section longitudinal rib 16; the detachable skin 10 is connected to the fixed skin 11 through sealing glue 12, and is arranged at the connection flange; the space in the tail section duct 5 is filled with light buoyancy material 13. In the embodiment, the width of the detachable skin 10 is just the distance between the tail end flange 6 of the connection flange and the tail section ring rib 9, so that the connection among the tail section duct 5, the bow section duct 4 and the connection flange is facilitated. The tail end flange 6 of the connection flange and the tail section ring rib 9 are provided with the tail section longitudinal rib 16, and the tail section longitudinal rib 16 is welded with an ear plate 15; the detachable skin 10 is fixed to the ear plate 15 through a countersunk screw 14, so that the connection is convenient and reliable, and the fixing effect of the detachable skin 10 is improved.

[0032] The bow section duct 4 comprises a bow section duct inner and outer ring surface surrounded by a fixed skin 11; the bow section duct outer ring surface and the bow section duct inner ring surface are connected through a bow section ring rib and a bow section longitudinal rib; the space in the bow section duct is filled with light buoyancy material 13.

[0033] In order to ensure sealing, sealing glue is arranged at the connection joint of the duct structure 1.

[0034] In the embodiment, the detachable skin 10 can be divided into multiple parts in the circumferential direction to facilitate arrangement; the connection joint between adjacent detachable skins 10 is filled with sealing glue 12 to realize sealing.

[0035] In the embodiment, the thickness of the tail end flange is twice the thickness of the tail section ring rib; the thickness of the bow end flange is twice the thickness of the bow section ring rib, and the rigidity of the connection flange is far greater than that of the ring rib, so that the rigidity of the duct structure is improved.

[0036] The present invention moves the connecting flange rearward without changing the position of the propeller, shortens the length of the stern section duct, increases the rigidity of the duct near the propeller, reduces the weight of the stern section duct, and greatly reduces the possibility of the duct getting stuck on the propeller.

[0037] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A pump-jet propulsor duct connection structure, including a connecting flange, characterized in that: The connecting flange is installed behind the propeller blades and includes a stern flange and a bow flange, and the diameter of the bow flange is larger than the diameter of the propeller; the stern flange is installed at the front end of the stern section duct, and the bow flange is installed at the rear end of the bow section duct; the stern flange and the bow flange are connected by connecting bolts, connecting the stern section duct and the bow section duct together to form a duct structure; The stern section duct includes an outer annular surface of the stern section duct surrounded by a fixed skin and a removable skin, and an inner annular surface of the stern section duct surrounded by the fixed skin; stern section annular ribs and stern section longitudinal ribs are arranged between the outer annular surface of the stern section duct and the inner annular surface of the stern section duct; the removable skin is connected to the fixed skin by a sealant, and the removable skin is placed at the connecting flange; the gap in the stern section duct is filled with a lightweight buoyancy material; the inner and outer annular surfaces of the bow section duct are surrounded by the fixed skin; the bow section annular ribs and bow section longitudinal ribs are arranged between the outer annular surface of the bow section duct and the inner annular surface of the bow section duct; the gap in the bow section duct is filled with a lightweight buoyancy material; The thickness of the stern flange is 2-3 times the thickness of the stern section annular reinforcement; the thickness of the bow flange is 2-3 times the thickness of the bow section annular reinforcement.

2. The pump-jet propulsor duct connection structure according to claim 1, characterized in that: The stern flange is provided with a bolt through hole, the bow flange is provided with a threaded hole, and the threaded hole cannot penetrate the bow flange to ensure sealing.

3. The pump-jet propulsor duct connection structure according to claim 1, characterized in that: Before screwing the connecting bolts into the stern flange and the bow flange, apply thread locking glue to ensure sealing.

4. The pump-jet propulsor duct connection structure according to claim 1, characterized in that: The width of the removable skin is exactly the distance between the stern flange and the stern section ring rib.

5. The pump-jet propulsor duct connection structure according to claim 4, characterized in that: A stern section longitudinal rib is provided between the stern end flange and the stern section ring rib, and an ear plate is provided on the stern section longitudinal rib. Countersunk screws fix the removable skin on the ear plate.

6. The pump-jet propulsor conduit connection structure according to claim 1 or 4, characterized in that: The detachable skin is divided into multiple pieces in the circumferential direction, and the connecting seams between adjacent detachable skins are filled with sealant.

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