Flexible impeller type sea water pump for ship machine

Abstract

The utility model provides a flexible impeller type sea water pump for a ship machine, and relates to the technical field of sea water pumps, the flexible impeller type sea water pump for the ship machine comprises: a pump body, which is internally provided with a working cavity and a transmission cavity, and is provided with a water inlet and a water outlet communicated with the working cavity; the pump shaft comprises a first section located in the working cavity and a second section which penetrates through the transmission cavity and extends out of the transmission cavity; the eccentric block protrudes inwards in the radial direction from the inner wall of the working cavity; the first section is sleeved with the impeller assembly, and the impeller assembly rotates along with the pump shaft so as to be matched with the eccentric block to scrape seawater from the water inlet to the water outlet; the end, away from the second section, of the impeller assembly is provided with a matching part, and the matching part is suitable for enabling the impeller assembly to horizontally move in the axis direction of the pump shaft under matching of an external tool so that the impeller assembly can be disengaged from the pump shaft.

Description

Technical Field

[0001] At least one embodiment of this utility model relates to the field of seawater pump technology, and more particularly to a flexible impeller seawater pump for marine machinery. Background Technology

[0002] Small speedboats have high requirements for overall performance and safety when sailing at sea. Overheating of the engine during operation can lead to unsafe situations such as decreased efficiency, lubrication failure, and increased fuel consumption. Therefore, engine cooling is particularly important.

[0003] Seawater is the best choice for the cooling medium of small speedboat engines. However, seawater contains a lot of solid particles and is highly corrosive, thus requiring high reliability from the cooling equipment. Compared to other pump types, flexible impeller pumps can adapt to the frequent start-stop and complex environmental conditions of speedboats. They can use seawater, which contains a lot of solid particles and is highly corrosive, as the working medium, and they operate smoothly with low noise.

[0004] Common flexible impeller pumps have complex structures, with various components affecting each other. In the event of damage to a single part, maintenance and replacement cannot be carried out quickly and conveniently, resulting in a short service life and limited overall efficiency of the flexible impeller pump. Utility Model Content

[0005] In view of this, the present invention provides a flexible impeller seawater pump for marine machinery, which enables quick and convenient disassembly of the impeller assembly and improves the service life of the flexible impeller seawater pump for marine machinery.

[0006] As one aspect of this utility model, a flexible impeller-type seawater pump for marine machinery is provided, characterized in that it comprises: a pump body, which internally forms a working chamber and a transmission chamber, and forms an inlet and an outlet communicating with the working chamber; a pump shaft, including a first section located in the working chamber and a second section passing through and extending out of the transmission chamber; an eccentric block, which protrudes radially inward from the inner wall of the working chamber; an impeller assembly sleeved on the first section, the impeller assembly rotating with the pump shaft to cooperate with the eccentric block to scoop seawater from the inlet to the outlet; and a mating part provided at the end of the impeller assembly away from the second section, the mating part being adapted to allow the impeller assembly to translate along the axial direction of the pump shaft under the cooperation of external tooling, so as to disengage the impeller assembly from the pump shaft.

[0007] According to an embodiment of the present invention, the mating part is an internal thread structure, and the tooling has an external thread that mates with the internal thread structure.

[0008] According to an embodiment of the present invention, the first length of the first segment is less than the second length of the impeller assembly along the axial direction of the pump shaft.

[0009] According to an embodiment of the present invention, the impeller assembly includes: a frame sleeved on the outside of the pump shaft; a plurality of blades evenly distributed along the circumferential direction of the frame; and the mating part formed at the end of the frame away from the second segment.

[0010] According to an embodiment of the present invention, the above-mentioned flexible impeller seawater pump for marine machinery further includes: a gasket, configured as an annular structure, disposed between the transmission chamber and the working chamber, with a gap between the gasket and the pump shaft; a water seal unit, sleeved on the side of the pump shaft opposite to the gasket; and a first channel and a second channel extending radially at both ends of the axial direction of the frame, wherein seawater flows into the space enclosed by the frame, the pump shaft and the pump body from the first channel, and seawater flows through the gap from the second channel to contact the water seal unit to balance the pressure at both ends of the frame.

[0011] According to an embodiment of the present invention, an opening is formed on the side of the working chamber away from the transmission chamber. The flexible impeller seawater pump for marine engines further includes: a cover body, which is detachably covered by the opening to restrict the position of the impeller assembly relative to the pump shaft in the axial direction when the cover body is connected to the pump body; and to allow the impeller assembly to translate in the axial direction when the cover body is detached from the pump body.

[0012] According to an embodiment of the present invention, the eccentric block includes: a connecting portion, wherein the first arc angle of the first arc surface of the connecting portion near the inner wall is 64° to 65°; and two transition portions, respectively located on both sides of the connecting portion, wherein the two transition portions are respectively configured such that the radius gradually increases from one side of the connecting portion to the side away from the connecting portion.

[0013] According to an embodiment of the present invention, the second arc angle of the second arc surface of the eccentric block that contacts the working cavity is 176° to 184°.

[0014] According to an embodiment of the present invention, a threaded hole is formed on the eccentric block; a through hole is formed on the pump body at a position opposite to the threaded hole, and a bolt passes through the through hole and is threadedly engaged with the threaded hole, so that the eccentric block is detachably installed in the working cavity.

[0015] According to an embodiment of the present invention, the above-mentioned flexible impeller seawater pump for marine machinery further includes: a transmission assembly disposed in the transmission cavity, the pump shaft passing through the transmission assembly, and the transmission assembly being configured to allow the pump shaft to rotate relative to the pump body.

[0016] According to the embodiments of the present invention, the flexible impeller seawater pump for marine engines forms a mating part at one end of the second section of the impeller assembly away from the pump shaft. This allows the impeller assembly to translate along the axial direction of the pump shaft under the cooperation of external tooling and the mating part. When the impeller assembly needs to be disassembled, it can be quickly disassembled and installed, which is beneficial to the daily maintenance and repair of speedboats, reduces maintenance costs and time, and extends the service life of the flexible impeller seawater pump for marine engines. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 The diagram schematically shows a first-view perspective perspective of a flexible impeller seawater pump for marine machinery according to an embodiment of the present invention.

[0019] Figure 2 The diagram schematically shows a second perspective view of a flexible impeller seawater pump for marine machinery according to an embodiment of the present invention;

[0020] Figure 3 A schematic side view of a flexible impeller seawater pump for marine machinery according to an embodiment of the present invention is shown.

[0021] Figure 4 Schematic illustration Figure 3 The diagram shows a cross-sectional view of AA, a flexible impeller-type seawater pump for marine machinery.

[0022] Figure 5 Schematic illustration Figure 3 The diagram shows a cross-sectional view of the BB of a flexible impeller seawater pump for marine machinery.

[0023] Figure 6 A perspective view of an impeller assembly according to an embodiment of the present invention is shown schematically;

[0024] Figure 7 Schematic illustration Figure 6 A cross-sectional view of the impeller assembly;

[0025] Figure 8 A perspective view of an eccentric block according to an embodiment of the present invention is shown schematically;

[0026] Figure 9 Schematic illustration Figure 8 Side view of the eccentric block.

[0027] The annotations in the attached figures are explained as follows:

[0028] 1. Pump body; 11. Inlet pipe; 12. Outlet pipe; 13. Cover; 14. Connecting hole; 15. Bolt;

[0029] 2. Pump shaft; 21. First section; 22. Second section;

[0030] 3. Eccentric block; 31. Connecting part; 32. Transition part; 33. Threaded hole;

[0031] 4. Impeller assembly; 41. Mating part; 42. Frame; 421. First channel; 43. Blades;

[0032] 5. Gaskets;

[0033] 6. Transmission components; 61. Bearings; 62. Oil seal unit; 63. Water seal unit. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0036] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0037] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0038] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this utility model.

[0039] Figure 1 This schematically illustrates a first-view perspective perspective view of a flexible impeller-type seawater pump for marine machinery according to an embodiment of the present invention. Figure 2 This schematically illustrates a second-view perspective perspective view of a flexible impeller-type seawater pump for marine machinery according to an embodiment of the present invention. Figure 3 A schematic side view of a flexible impeller seawater pump for marine machinery according to an embodiment of the present invention is shown. Figure 4 Schematic illustration Figure 3 The diagram shown is a cross-sectional view of AA, a flexible impeller-type seawater pump for marine machinery. Figure 5 Schematic illustration Figure 3 The diagram shows a cross-sectional view of the BB of a flexible impeller seawater pump for marine machinery.

[0040] It should be noted that, Figure 5 The impeller assembly in the diagram is for illustrative purposes only. In reality, when the blade rotates to contact the eccentric block, the blade can deform under the action of the eccentric block, and can return to the state before the deformation when it is separated from the eccentric block.

[0041] As one aspect of this utility model, a flexible impeller-type seawater pump for marine machinery is provided. For example... Figures 1 to 5 As shown, a flexible impeller-type seawater pump for marine machinery includes a pump body 1, a pump shaft 2, an eccentric block 3, and an impeller assembly 4. The pump body 1 internally forms a working chamber and a transmission chamber, and forms an inlet and an outlet communicating with the working chamber. The pump shaft 2 includes a first section 21 located within the working chamber and a second section 22 passing through and extending from the transmission chamber. The eccentric block 3 protrudes radially inward from the inner wall of the working chamber. The impeller assembly 4 is fitted onto the first section 21 of the pump shaft 2. The impeller assembly 4 is configured to rotate with the pump shaft 2 to cooperate with the eccentric block 3, drawing seawater from the inlet to the outlet. A mating part 41 is provided at one end of the second section 22 of the impeller assembly 4, away from the pump shaft 2. The mating part 41 is adapted to allow the impeller assembly 4 to translate along the axial direction of the pump shaft 2 under the cooperation of external tooling, so that the impeller assembly 4 can disengage from the pump shaft 2.

[0042] According to the embodiment of the present invention, the flexible impeller seawater pump for marine engines forms a mating part 41 at one end of the second section 22 of the impeller assembly 4 away from the pump shaft 2. This allows the impeller assembly 4 to translate along the axial direction of the pump shaft 2 under the cooperation of external tooling and the mating part 41. When it is necessary to disassemble the impeller assembly 4, it can be quickly disassembled and installed, which is beneficial to the daily maintenance and repair of the speedboat, reduces maintenance costs and time, and extends the service life of the flexible impeller seawater pump for marine engines.

[0043] In some illustrative embodiments, the pump body 1 may be integrally cast from a corrosion-resistant material. Corrosion-resistant materials include any of stainless steel, nickel-based alloys, aluminum alloys, etc.

[0044] In such an embodiment, the flexible impeller seawater pump for marine engines cooperates with the impeller assembly 4 through the eccentric block 3 set in the working chamber to flex seawater from the inlet to the outlet, so as to cool the engine of the small speedboat by using seawater.

[0045] In some illustrative embodiments, the cross-sectional area of ​​the inlet is larger than that of the outlet.

[0046] In one illustrative embodiment, the inlet is provided with an inlet channel, and the outlet is provided with an outlet channel. Seawater flows into the inlet through the inlet channel, is drawn to the outlet by the impeller assembly 4 and the eccentric block 3, and is guided to the target location (e.g., to cool the engine of a small speedboat) through the outlet pipe 12. Both the inlet pipe 11 and the outlet pipe 12 have circular cross-sections, with the diameter of the outlet pipe 12 being larger than the diameter of the inlet pipe 11.

[0047] In some illustrative embodiments, the ratio of the cross-sectional area of ​​the outlet to the cross-sectional area of ​​the inlet is 1.2 to 1.27. This minimizes the pressure and friction losses during operation of the flexible impeller seawater pump for marine machinery, thereby improving operational stability.

[0048] The cross-sectional area of ​​the inlet pipe matches the cross-sectional area of ​​the inlet, and the cross-sectional area of ​​the outlet pipe matches the cross-sectional area of ​​the outlet.

[0049] Furthermore, the inner diameter of the inlet pipe 11 can be 40mm, and the inner diameter of the outlet pipe can be 45mm.

[0050] In one illustrative embodiment, such as Figure 2 As shown, a connection hole 14 is formed on the water outlet pipe 12. The connection hole 14 is used to install a sensor (such as a flow sensor or a pressure sensor) to monitor the water outlet status.

[0051] According to embodiments of the present invention, such as Figure 1 , Figure 3 and Figure 4As shown, an opening is formed on the side of the working chamber away from the transmission chamber. The flexible impeller seawater pump for marine machinery also includes a cover 13, which is detachably covered by the opening to restrict the position of the impeller assembly 4 relative to the pump shaft 2 in the axial direction when the cover 13 is connected to the pump body 1; and to allow the impeller assembly 4 to translate in the axial direction when the cover 13 is detached from the pump body 1.

[0052] In one illustrative embodiment, such as Figure 1 As shown, along the axial direction of the pump shaft 2, an opening is formed on the side of the second section 22 of the pump body 1 near the pump shaft 2, and multiple mounting holes (e.g., threaded holes) are formed around the opening. Multiple mating holes are formed on the cover 13 facing the mounting holes, and multiple bolts pass through the multiple mating holes and engage with the mounting holes, so that the cover 13 is detachably installed on the pump body 1.

[0053] In one illustrative embodiment, a sealing ring (e.g., an O-ring) may also be provided between the cover 13 and the pump body 1 to make a sealed connection between the cover 13 and the pump body 1.

[0054] Figure 6 A perspective view of an impeller assembly according to an embodiment of the present invention is shown schematically. Figure 7 Schematic illustration Figure 6 A cross-sectional view of the impeller assembly.

[0055] According to embodiments of the present invention, such as Figure 4 , Figure 6 and Figure 7 As shown, the mating part has an internal thread structure, and the tooling has an external thread that mates with the internal thread structure.

[0056] In one illustrative embodiment, the tooling may include a screw and a handle. The screw has an external thread structure capable of threaded engagement with an internal thread structure, and the handle is disposed at one end of the screw. The handle is used for user operation (e.g., rotation) to thread the screw into the mating part 41. Thus, in the threaded engagement state of the screw and the mating part 41, the user can operate the handle (e.g., pull the handle along the axis of the pump shaft 2) to cause the screw to drive the impeller assembly 4 to translate along the axis of the pump shaft 2, thereby disengaging the impeller assembly 4 from the pump shaft 2.

[0057] The internal thread structure can be a national standard thread, and the tooling can be a bolt. The bolt has an external thread structure corresponding to the internal thread structure, which is threaded with the internal thread.

[0058] When it is necessary to disassemble the impeller assembly, the user removes the cover. The user screws the external thread into the connecting part, and with the tooling against the pump shaft, further screws the tooling into the connecting part, allowing the impeller assembly 4 to translate along the pump shaft 2, thereby improving the efficiency of disassembling the impeller assembly 4. Alternatively, after the user screws the external thread of the tooling into the connecting part, a force is applied to the tooling in the axial direction of the pump shaft, away from the working chamber, causing the impeller assembly to translate along with the tooling and disengage from the pump shaft.

[0059] According to embodiments of the present invention, such as Figure 4 As shown, the first length D1 of the first segment 21 of the pump shaft 2 is less than the second length D2 of the impeller assembly 4 along the axial direction of the pump shaft 2, that is, D1 < D2.

[0060] According to embodiments of the present invention, such as Figures 4 to 7 As shown, the impeller assembly 4 includes a frame 42 and multiple blades 43. The frame 42 is fitted over the first section 21 of the pump shaft 2. The multiple blades 43 are evenly distributed along the circumferential direction of the frame 42. A mating part 41 is formed at one end of the frame 42 away from the second section 22 of the pump shaft 2.

[0061] In this embodiment, the mating portion 41 is formed at one end of the second segment 22 of the frame 42, away from the pump shaft 2. At least a portion of the mating portion 41 is disengaged from the pump shaft 2.

[0062] In such an embodiment, the frame 42 is configured to rotate with the pump shaft 2.

[0063] In some illustrative embodiments, the first segment 21 of the pump shaft 2 is configured as a splined shaft, and the inner wall of the frame 42 forms a mating structure that engages with the splined shaft to limit the circumferential position between the frame 42 and the splined shaft, allowing the frame 42 to rotate with the pump shaft 2. It is understood that the first segment 21 of the pump shaft 2 and the frame 42 can also have other mating forms, such as a key fit or a pin fit.

[0064] In one illustrative embodiment, the number of blades 43 can be any value among 7, 8, 9, 10, 11, 12, 13, 14, and 15. It is understood that the embodiments of this invention are not limited thereto.

[0065] In one illustrative embodiment, the blade 43 is made of a flexible material to deform under the action of the eccentric block 3.

[0066] In one illustrative embodiment, the blade 43 can be made of rubber. The frame can be made of metal.

[0067] In one illustrative embodiment, multiple blades 43 are interference-fitted with the working chamber along the axial direction of the pump shaft 2, thereby improving the efficiency and service life of the impeller assembly 4.

[0068] In one illustrative embodiment, the blade 43 can be attached to the frame 42 by means of adhesive bonding.

[0069] In one illustrative embodiment, a plurality of blades 43 are spaced apart and evenly arranged along the circumferential direction of the frame 42.

[0070] According to an embodiment of this utility model, the flexible impeller seawater pump for marine machinery further includes a gasket 5 and a water seal unit 63. The gasket 5 is constructed in an annular structure and is disposed between the transmission chamber and the working chamber, with a gap between the gasket 5 and the pump shaft 2. The water seal unit 63 is sleeved on the side of the pump shaft 2 opposite to the gasket 5. The two ends of the frame 42 axially form a first channel 421 and a second channel extending radially. Seawater flows into the space enclosed by the frame, pump shaft, and pump body from the first channel 421, and seawater flows through the gap between the gasket 5 and the pump shaft 2 from the second channel to contact the water seal unit 63 to balance the pressure at both ends of the frame 42.

[0071] In such an embodiment, the water seal unit 63 is adapted to prevent the working medium (seawater) in the working chamber from moving further toward the transmission chamber.

[0072] According to an embodiment of this utility model, the first end of the connecting portion 31 of the frame 42 extends radially to form a first channel 421 (or a through groove), which communicates with the space enclosed by the frame, pump shaft, and pump body. The second end of the frame 42, opposite to the first end, extends radially to form a second channel, which communicates with the gap between the gasket 5 and the pump shaft 2. Seawater in the working chamber flows through the second channel, through the gap between the gasket 5 and the pump shaft 2, and into the water seal unit 63. In this way, on the one hand, the pressure at both ends of the frame 42 can be balanced, and on the other hand, the water seal unit 63 can be brought into contact with seawater to cool the water seal unit 63, prevent the water seal unit 63 from overheating and failing, and improve the sealing effect of the water.

[0073] like Figure 4 As shown, the gasket 5 is disposed between the transmission cavity and the working cavity, as... Figure 4 From the perspective shown, the left side of shim 5 is the transmission chamber, and the right side is the working chamber.

[0074] According to an embodiment of the present invention, the gasket 5 is adapted to contact the impeller assembly 4 to act as a friction plate. The impeller assembly 4 is arranged between the gasket and the cover 13.

[0075] In some illustrative embodiments, the gasket 5 can be a contour gasket 5, mounted on the pump body 1. The gasket 5 and the pump body 1 can be connected by a split pin connection.

[0076] In some illustrative embodiments, the gasket 5 may be made of metal, such as bronze or stainless steel.

[0077] Figure 8 A perspective view of an eccentric block according to an embodiment of the present invention is shown schematically. Figure 9 Schematic illustration Figure 8 Side view of the eccentric block.

[0078] According to embodiments of the present invention, such as Figure 5 , Figure 8 and Figure 9 As shown, the eccentric block 3 includes a connecting portion 31 and two transition portions 32. The two transition portions 32 are respectively located on both sides of the connecting portion 31, and the two transition portions 32 are respectively configured such that the radius gradually increases from one side of the connecting portion 31 to the side away from the connecting portion 31.

[0079] In one illustrative embodiment, the cross-sections of the connecting portion 31 and the transition portion 32 are both arc-shaped along a plane perpendicular to the axial direction of the pump shaft 2.

[0080] In one illustrative embodiment, the arc centers of the cross sections of the connecting portion 31 and the transition portion 32 may or may not coincide along a plane perpendicular to the axial direction of the pump shaft 2.

[0081] According to an embodiment of the present invention, the first arc center angle α of the first arc surface of the connecting part 31 near the inner wall of the skeleton 42 is 64° to 65°.

[0082] Eccentric block 3 is positioned between the inlet and the outlet.

[0083] According to an embodiment of this utility model, the second arc angle β of the second arc surface of the eccentric block 3 that contacts the working cavity is 176° to 184°. That is, the eccentric angle in the entire working cavity accounts for approximately 49% to 51% of the entire circumferential angle.

[0084] In one illustrative embodiment, the radius of the second arc surface of the eccentric block 3 that contacts the working cavity is equal to the radius of the working cavity.

[0085] According to an embodiment of the present invention, a threaded hole 33 is formed on the eccentric block 3. A through hole 421 is formed on the pump body 1 at a position opposite to the threaded hole 33. A bolt 15 passes through the through hole 421 and is threaded into the threaded hole 33, thereby detachably installing the eccentric block 3 into the working cavity.

[0086] Specifically, the threaded hole 33 is formed on the connecting part 31 of the eccentric block 3.

[0087] According to embodiments of the present invention, such as Figure 4As shown, the flexible impeller seawater pump for marine machinery also includes a transmission assembly 6 disposed in the transmission chamber, through which the pump shaft 2 passes. The transmission assembly 6 is configured to allow the pump shaft 2 to rotate relative to the pump body 1.

[0088] like Figure 4 As shown, the transmission assembly 6 includes two sets of bearings 61 and an oil seal unit 62. The two sets of bearings 61 are arranged at intervals along the axial direction of the pump shaft 2, and are used to support the pump shaft 2 and allow the pump shaft 2 to rotate relative to the pump body 1. The oil seal unit 62 is arranged at intervals along the axial direction with respect to the bearings 61, and is located on the side of the two sets of bearings 61 closer to the working chamber. The oil seal is used to prevent lubricating oil in the transmission chamber from flowing into the working chamber.

[0089] In such an embodiment, the oil seal unit 62 is adapted to prevent lubricating oil leakage from the transmission cavity.

[0090] In this embodiment, during normal operation of the flexible impeller seawater pump for marine machinery, the flexible blades 43 and the inner cavity of the pump body 1 equipped with the eccentric block 3 form a sealed space. When the impeller rotates past the eccentric block 3 and reaches the pump outlet, the blades 43 extend, increasing the cavity volume between adjacent blades 43 and creating a partial vacuum within the pump, drawing in seawater. When the impeller rotates past the eccentric block 3 and reaches the inlet, the cavity volume between the two blades 43 decreases. Through the squeezing action of the blades 43, seawater is forced out of the cavity and enters the outlet. The periodic flexing action of the impeller blades 43 ensures a continuous, uninterrupted flow of seawater.

[0091] In some illustrative embodiments, the pump body 1 is integrally cast from a corrosion-resistant material. The pump body 1 has a working chamber and a transmission chamber inside. The working chamber has an inlet and an outlet. The inlet pipe 11 has an inner diameter of 40 mm, and the outlet pipe 12 has an inner diameter of 45 mm. The cross-sectional area of ​​the outlet pipe 12 / the cross-sectional area of ​​the inlet pipe is 1.2 to 1.27. Within this ratio range, the pressure loss and friction loss of the flow during operation can be minimized, thereby improving the operational stability.

[0092] like Figure 4 As shown, the pump shaft 2 extends into the working chamber through the transmission chamber. The transmission assembly 6 is detachably mounted on the pump shaft 2 and located within the transmission chamber. The transmission assembly 6 adopts a modular design, allowing each component to be maintained and replaced individually. The gasket 5 divides the inner cavity of the pump body 1 into sections located at the front end ( Figure 4 The transmission cavity (left side of the view shown) and located at the rear end ( Figure 4 The working cavity (shown from the right side of the viewpoint).

[0093] The transmission assembly 6 includes two bearings 61 and an oil seal unit 62. The two bearings 61 support the high-speed rotation of the pump shaft 2, and the oil seal unit 62 prevents lubricating oil leakage from the transmission cavity.

[0094] The transmission chamber is equipped with an integrated water seal unit to prevent the working medium in the transmission chamber from flowing further towards the transmission chamber. A conformal gasket 5 is installed on the side of the working chamber near the transmission chamber. The gasket 5 can be directly and firmly installed on the pump body 1. The other end of the working chamber away from the transmission chamber is equipped with a cover 13 to seal the working chamber. The cover 13 is fixed to the pump body 1 by bolts 15. An O-ring seal is used between the cover 13 and the pump body 1.

[0095] An adjustable eccentric block 3 is fixed on the inner wall of the working chamber between the inlet and outlet. The eccentric block 3 can be integrated with the pump body 1 and undergoes precise post-processing.

[0096] An impeller with flexible blades 43 is mounted on a pump shaft 2 in a sealed working environment surrounded by a gasket 5, an eccentric block 3, an end cover, and the working chamber of the pump body 1. During pump operation, the flexible blades 43 and the inner cavity of the pump body 1 containing the eccentric block 3 form a sealed space. When the impeller rotates past the eccentric block 3 to reach the impeller pump outlet, the blades 43 extend, increasing the volume of the cavity between adjacent blades 43, creating a partial vacuum within the pump body 1, and seawater is drawn in. When the impeller rotates past the eccentric block 3 to reach the inlet, the volume of the cavity between adjacent blades 43 decreases. Due to the squeezing action of the blades 43, seawater is forced out of the cavity and enters the outlet. The periodic flexing action of the impeller blades 43 ensures a continuous flow of seawater.

[0097] The impeller assembly 4 is mainly composed of rubber blades 43 and a hollow metal frame 42. The blades 43 are made of rubber and are formed by vulcanizing special rubber material in a special mold. The outer circumferential surface of the metal frame 42 and the inner circumferential surface of the rubber blades 43 are connected by a Chemlock connection to form a complete impeller assembly 4.

[0098] The frame 42 has 10 evenly distributed rubber blades 43 extending radially in the circumferential direction. The ends of the rubber blades 43 away from the frame 42 are provided with protruding cylindrical ridges in the axial direction. The blades 43 have an axial length of 80 mm and a working cavity depth of 79.5 mm. This interference fit can improve the efficiency and service life of the impeller assembly 4.

[0099] The impeller assembly 4 has a maximum diameter of 66mm, which minimizes internal leakage and improves volumetric efficiency during operation. A specially designed spline is machined on the inner circumferential surface of the metal frame 42 to match the working end of the pump shaft 2, ensuring a tight radial connection. A mating part 41 is formed at the end of the frame 42 furthest from the transmission cavity, accommodating specialized tooling, making the impeller assembly 4 easy to install, disassemble, and replace, thus reducing later maintenance costs.

[0100] Along a plane orthogonal to the axial direction of the pump shaft 2, the cross section of the eccentric block 3 has a curvature determined according to a predetermined curve equation, so that the maximum radius of the working chamber is 31.5 mm and the minimum radius is 25.1 mm. The first arc angle α of the first arc surface near the inner wall of the minimum radius part (that is, the connecting part 31) is 64° to 65°. The two sides of the connecting part 31 are connected by transition curves (that is, transition parts 32). The two transition parts 32 cover the inlet and outlet respectively, and the eccentric angle in the entire working chamber (the second arc angle β of the second arc surface of the eccentric block 3 in contact with the working chamber) accounts for 49% to 51% of the entire circumference angle. This size and proportion design ensures the efficient operation of the flexible impeller seawater pump for marine machinery.

[0101] In this embodiment, the design of the eccentric block 3 in the working chamber, as well as the position and size of the inlet and outlet, enable the flexible impeller seawater pump for marine engines to operate efficiently, achieving a flow rate of 190 L / min and a head of 26 m at a pump speed of 3009 r / min.

[0102] The flexible impeller seawater pump for marine engines provided in this embodiment of the utility model has a modular and simplified overall structure design. While ensuring superior performance, it has a simple structure and small size. At the same time, each component can be independently disassembled and replaced, which facilitates later maintenance.

[0103] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the present invention, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A flexible impeller-type seawater pump for marine machinery, characterized in that, include: The pump body has an internal working chamber and a transmission chamber, and an inlet and an outlet communicating with the working chamber. The pump shaft includes a first section located within the working chamber and a second section passing through and extending from the transmission chamber; An eccentric block protrudes radially inward from the inner wall of the working cavity; An impeller assembly is fitted onto the first section. The impeller assembly rotates with the pump shaft to cooperate with the eccentric block, drawing seawater from the inlet to the outlet. A mating part is provided at the end of the impeller assembly away from the second section. The mating part is adapted to allow the impeller assembly to translate along the axial direction of the pump shaft with the cooperation of external tooling, so that the impeller assembly disengages from the pump shaft.

2. The flexible impeller seawater pump for marine machinery according to claim 1, characterized in that, The mating part has an internal thread structure, and the tooling has an external thread that mates with the internal thread structure.

3. The flexible impeller-type seawater pump for marine machinery according to claim 1 or 2, characterized in that, The first length of the first segment is less than the second length of the impeller assembly along the axial direction of the pump shaft.

4. The flexible impeller-type seawater pump for marine machinery according to claim 1 or 2, characterized in that, The impeller assembly includes: A frame, fitted over the pump shaft; Multiple blades are evenly distributed along the circumferential direction of the skeleton; The mating part is formed at the end of the skeleton away from the second segment.

5. The flexible impeller seawater pump for marine machinery according to claim 4, characterized in that, Also includes: A gasket, configured as a ring structure, is disposed between the transmission chamber and the working chamber, and there is a gap between the gasket and the pump shaft; A water seal unit is fitted onto the side of the pump shaft opposite to the gasket; The skeleton forms a first channel and a second channel extending radially at both ends along its axial direction. Seawater flows into the space enclosed by the skeleton, the pump shaft, and the pump body from the first channel, and flows through the gap from the second channel to contact the water seal unit to balance the pressure at both ends of the skeleton.

6. The flexible impeller-type seawater pump for marine machinery according to claim 1 or 2, characterized in that, An opening is formed on the side of the working chamber away from the transmission chamber, and the marine engine flexible impeller seawater pump further includes: A cover, which detachably covers the opening, to restrict the position of the impeller assembly relative to the pump shaft in the axial direction when the cover is attached to the pump body; and to allow the impeller assembly to translate in the axial direction when the cover is detached from the pump body.

7. The flexible impeller seawater pump for marine machinery according to claim 1, characterized in that, The eccentric block includes: The connecting part has a first arc central angle of 64° to 65° on the first arc surface near the inner wall; Two transition portions are respectively placed on both sides of the connecting portion, and the two transition portions are respectively configured such that the radius gradually increases from one side of the connecting portion to the side away from the connecting portion.

8. The flexible impeller-type seawater pump for marine machinery according to claim 7, characterized in that, The second arc angle of the second arc surface of the eccentric block that contacts the working cavity is 176° to 184°.

9. The flexible impeller seawater pump for marine machinery according to claim 1, characterized in that, A threaded hole is formed on the eccentric block; A through hole is formed on the pump body at a position opposite to the threaded hole. A bolt passes through the through hole and is threaded into the threaded hole, thereby detachably installing the eccentric block into the working chamber.

10. The flexible impeller seawater pump for marine machinery according to claim 1, characterized in that, Also includes: A transmission assembly is disposed in the transmission cavity, through which the pump shaft passes, and the transmission assembly is configured to allow the pump shaft to rotate relative to the pump body.

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