Flow guide tube for integrated motor propulsion device

Abstract

The present invention provides a guide tube for an integrated motor propulsion device, comprising: an inlet shell, an annular shell and an outlet shell; the inlet shell, the annular shell and the outlet shell are connected in sequence to form a guide tube, a support shaft is arranged in the guide tube, a moving impeller is rotatably connected to the support shaft, a rim of the moving impeller is connected to a rotor assembly, and the rotor assembly and the moving impeller are located at the annular shell; one end of the stationary impeller is connected to the support shaft, and the other end is connected to the inner wall surface of the outlet shell; the inner wall surface of the outlet shell and the outer wall surface of the outlet shell gradually shrink toward the axial direction of the guide tube from one end close to the annular shell to one end away from the annular shell, so that the outlet shell has an airfoil profile. In the guide tube for the integrated motor propulsion device of the present invention, the airfoil profile of the outlet shell increases the static pressure of the fluid in the outer wall area of ​​the outlet shell, and gives a certain thrust to the integrated motor propulsion device in the horizontal direction, which is beneficial to improve the propulsion efficiency of the integrated motor propulsion device.

Description

Technical Field

[0001] The invention relates to the technical field of ships, and in particular to a flow guide pipe for an integrated motor propulsion device. Background Art

[0002] The integrated motor propulsion device uses a rim-driven motor installed inside the duct to drive the propeller blade assembly to rotate, generating the thrust required to drive the ship to sail. The integrated motor propulsion device is mainly composed of a duct, a blade assembly, a stationary blade assembly, a bearing assembly and a support shaft. Among them, the blade assembly and the rim-driven motor rotor are designed as an integrated whole, directly receiving the rotational mechanical energy and torque of the rim-driven motor; the stationary blade assembly is installed at the rear end of the blade assembly, and its blade root and blade top are welded to the support shaft and duct respectively, which has the functions of thrust recovery and structural support. The integrated motor propulsion device integrates the prime mover and the propulsion unit, eliminating the traditional propulsion shaft system and stern shaft sealing device, and has outstanding advantages such as compact structural integration, saving cabin space, and eliminating the hidden dangers of seawater leakage.

[0003] The duct is an important component of the integrated motor propulsion device. Its main functions are to provide space for the installation of the rim drive motor, to construct the internal flow channel of the propeller, and to serve as the overall support structure of the propeller. In the traditional integrated motor propulsion device solution, the thrust is mainly generated by the moving blade assembly and the stationary blade assembly. The duct has little consideration for the hydrodynamic design of the thrust and almost no thrust is provided, which leads to problems such as difficulty in improving the propulsion efficiency of the integrated motor propulsion device. Summary of the invention

[0004] The present invention provides a flow guide tube for an integrated motor propulsion device, which is used to solve the problem of poor propulsion efficiency of the existing integrated motor propulsion device.

[0005] The present invention provides a flow guide tube for an integrated motor propulsion device, comprising: an inlet casing, an annular casing and an outlet casing;

[0006] The inlet housing, the annular housing and the outlet housing are sequentially connected to form a flow guide pipe, and the flow guide pipe has an accommodating space for installing a support shaft, a moving impeller, a stationary impeller and a rotor assembly;

[0007] The support shaft is arranged in the guide tube and is coaxially arranged with the guide tube. The impeller is rotatably connected to the support shaft. The rim of the impeller is connected to the rotor assembly. The rotor assembly and the impeller are located at the annular housing. One end of the stationary impeller is connected to the support shaft, and the other end is connected to the inner wall surface of the outlet housing.

[0008] The inner wall surface of the outlet shell and the outer wall surface of the outlet shell gradually shrink toward the axial direction of the guide tube from one end close to the annular shell to one end far away from the annular shell, so that the outlet shell has an airfoil profile.

[0009] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the inner wall surface of the inlet shell forms a trumpet-shaped flow channel.

[0010] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the profile of the end of the support shaft located at the outlet shell is adapted to the profile of the inner wall surface of the outlet shell.

[0011] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the flow guide tube further comprises a plurality of vortex generators;

[0012] The plurality of vortex generators are circumferentially arranged on the outer wall surface of the outlet shell around the axis of the flow guide tube.

[0013] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, a first positioning structure is provided between the opposite walls of the inlet shell and the annular shell, and a second positioning structure is provided between the opposite walls of the annular shell and the outlet shell.

[0014] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the inlet housing includes a first support frame and a first skin;

[0015] The first skin forms an inner profile of the inlet shell, and the first supporting skeleton forms an outer profile of the inlet shell.

[0016] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the first support frame includes a first cylindrical outer plate and a first connecting plate connected to the first cylindrical outer plate, and the first connecting plate is connected to an end surface of the annular shell;

[0017] The first skin has a spline curve segment and a circular arc segment, one end of the spline curve segment is connected to the first connecting plate, and the other end of the spline curve segment is connected to an end of the first cylindrical outer plate away from the annular shell through the circular arc segment.

[0018] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the outlet casing includes a second support frame and a second skin;

[0019] The second supporting skeleton forms a part of the external profile and a part of the internal profile of the outlet shell, and the second skin forms another part of the external profile and another part of the internal profile of the outlet shell.

[0020] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, the second support frame includes a cylindrical inner plate, a second cylindrical outer plate, and a second connecting plate connecting the cylindrical inner plate and the second cylindrical outer plate, and the second connecting plate is connected to the other end surface of the annular shell;

[0021] The second skin includes an inner skin and an outer skin; one end of the cylindrical inner plate away from the second connecting plate is connected to the inner skin, and one end of the second cylindrical outer plate away from the second connecting plate is connected to the outer skin, and the inner skin and the outer skin are smoothly transitioned.

[0022] According to a flow guide tube for an integrated motor propulsion device provided by the present invention, a rib plate is provided on the wall surface of the cylindrical inner plate away from the support shaft.

[0023] The present invention provides a flow guide duct for an integrated motor propulsion device, which is formed by connecting an inlet casing, an annular casing and an outlet casing in sequence. The impeller and the rotor assembly are located in the accommodation space surrounded by the inner wall surface of the annular casing, and the stationary impeller is located in the accommodation space surrounded by the inner wall surface of the outlet casing. The airfoil profile of the outlet casing increases the static pressure of the fluid in the outer wall area of ​​the outlet casing, thereby giving the integrated motor propulsion device a certain thrust in the horizontal direction, which is beneficial to improving the propulsion efficiency of the integrated motor propulsion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0025] Figure 1 It is a schematic diagram of the assembly of the guide tube and components for the integrated motor propulsion device provided by the present invention;

[0026] Figure 2 It is a cross-sectional schematic diagram of a flow guide tube for an integrated motor propulsion device provided by the present invention;

[0027] Figure 3 It is a schematic diagram of the installation of the vortex generator provided by the present invention;

[0028] Figure 4 is a schematic diagram of a fluid flow guide tube provided by the present invention;

[0029] Figure 5 is a cross-sectional schematic diagram of the inlet housing provided by the present invention;

[0030] Figure 6is a cross-sectional schematic diagram of the annular shell provided by the present invention;

[0031] Figure 7 is a cross-sectional schematic diagram of the outlet housing provided by the present invention;

[0032] Figure markings: 1: guide tube; 2: drive motor; 201: stator; 3: moving impeller; 4: stationary impeller; 5: bearing assembly; 6: support shaft; 7: inlet shell; 701: arc segment; 702: spline curve segment; 703: first cylindrical outer plate; 704: first connecting plate; 705: first positioning groove; 706: fastener; 8: annular shell; 801: first positioning boss; 802: second positioning boss; 9: outlet shell; 901: second cylindrical outer plate; 902: second connecting plate; 903: cylindrical inner plate; 904: second positioning groove; 905: inner skin; 906: outer skin; 907: countersunk screw; 10: vortex generator; 11: trumpet-shaped inlet channel; 12: equal-section outlet channel; 13: external flow. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "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; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Combine the following Figures 1 to 7 The invention relates to a flow guide tube for an integrated motor propulsion device according to an embodiment of the present invention.

[0036] like Figure 1 , Figure 2 and Figure 6As shown, the air guide duct 1 for the integrated motor propulsion device provided by the embodiment of the present invention comprises: an inlet shell 7, an annular shell 8 and an outlet shell 9; the inlet shell 7, the annular shell 8 and the outlet shell 9 are connected in sequence to form the air guide duct 1, and the air guide duct 1 has an accommodating space for installing a support shaft 6, a moving impeller 3, a stationary impeller 4 and a rotor assembly; the support shaft 6 is arranged in the air guide duct 1 and is coaxially arranged with the air guide duct 1, the moving impeller 3 is rotatably connected to the support shaft 6, the rim of the moving impeller 3 is connected to the rotor assembly, and the rotor assembly and the moving impeller 3 are located at the annular shell 8; one end of the stationary impeller 4 is connected to the support shaft 6, and the other end is connected to the inner wall surface of the outlet shell 9; the inner wall surface of the outlet shell 9 and the outer wall surface of the outlet shell 9 gradually shrink toward the axial direction of the air guide duct 1 from one end close to the annular shell 8 to one end away from the annular shell 8, so that the outlet shell 9 has an airfoil profile.

[0037] Specifically, the flow guide 1 is composed of an inlet shell 7, an annular shell 8 and an outlet shell 9. The two end surfaces of the annular shell 8 are connected to the inlet shell 7 and the outlet shell 9 respectively. The inner wall surface of the inlet shell 7, the inner wall surface of the annular shell 8 and the inner wall surface of the outlet shell 9 form an accommodation space. The support shaft 6, the impeller 3, the stationary impeller 4 and the rotor assembly are installed in the accommodation space. The inner wall surface of the inlet shell 7, the inner wall surface of the annular shell 8 and the inner wall surface of the outlet shell 9 form an inner flow channel of the flow guide 1. The inlet shell 7, the annular shell 8 and the outlet shell 9 are coaxially arranged. The opposite ends of the flow guide 1 are defined as the inlet end of the flow guide 1 and the outlet end of the flow guide 1 respectively. The end of the inlet shell 7 forms the inlet end of the flow guide 1, and the end of the outlet shell 9 forms the outlet end of the flow guide 1.

[0038] The axis of the support shaft 6 is coaxial with the axis of the guide tube 1, and the length of the support shaft 6 is adapted to the length of the guide tube 1. The drive motor 2 includes a rotor assembly and a stator assembly, and the stator assembly includes a stator. The impeller 3 and the rotor assembly are installed in the accommodation space surrounded by the inner wall surface of the annular shell 8. The impeller 3 is rotatably connected to the support shaft 6 through the bearing assembly 5. The rim of the impeller 3 is connected to the rotor assembly. The rotor assembly includes a rotor and a rotor shell. The rotor is built into the rotor shell, and the rotor shell is a shielding sleeve of the rotor. An air gap channel is formed between the outer wall surface of the rotor shell and the inner wall surface of the annular shell 8. The stator 201 is built into the annular shell 8, and the annular shell 8 also serves as a shielding sleeve of the stator 201.

[0039] The inner wall surface of the outlet shell 9 has a tendency to gradually shrink toward the axial direction of the air guide pipe 1 from one end close to the annular shell 8 to the end away from the annular shell 8, and the outer wall surface of the outlet shell 9 has a tendency to gradually shrink toward the axial direction of the air guide pipe 1 from one end close to the annular shell 8 to the end away from the annular shell 8, that is, the inner wall profile and the outer wall profile of the outlet shell 9 make the outlet end of the air guide pipe 1 have an airfoil profile.

[0040] When the integrated motor propulsion device is working, the oncoming water flow is divided into two parts when passing through the front edge of the inlet shell 7. One part of the water flows through the inlet flow channel surrounded by the inner wall surface of the inlet shell 7 and enters the inner flow channel of the guide tube 1. Driven by the impeller 3, it flows toward the outlet end of the guide tube 1. After the static impeller 4 offsets most of the rotational speed components of the water flow and rectifies it, it is finally discharged from the outlet end of the guide tube 1. In this process, it absorbs the rotational mechanical work of the dynamic impeller 3 and converts it into thrust; the other part of the water flows along the outer wall of the guide tube 1 toward the rear end, and merges with the water flow in the inner flow channel in the tail area of ​​the outlet shell 9. The dynamic impeller 3 and the static impeller 4 are the two thrust sources for the integrated motor propulsion device to propel the ship forward.

[0041] The outlet casing 9 has a pseudo-airfoil profile. After a certain length of straight line profile, the profile of the outlet casing 9 gradually transitions to an airfoil curved surface that bends toward the axis of the airflow guide 1. Thus, the overall profile of the outlet casing 9 presents pseudo-airfoil characteristics and has the working characteristics of an airfoil spoiler. Since the profile of the outer wall of the outlet casing 9 is bent toward the axis of the airflow guide 1, along the flow direction of the fluid, the flow field area of ​​the outer wall of the outlet casing 9 gradually increases and the flow velocity decreases. Under the effect of fluid dynamics, the static pressure of the fluid acting in this area increases, and its horizontal component is converted into thrust, and the radial components perpendicular to the circumferential direction offset each other, thereby providing the integrated motor propulsion device with a third thrust source in addition to the moving impeller 3 and the stationary impeller 4. The airfoil profile of the outlet casing 9 provides additional thrust for the integrated motor propulsion device, which is beneficial to improving the propulsion efficiency of the integrated motor propulsion device.

[0042] Furthermore, the inner wall profile and the outer wall profile of the outlet shell 9 gradually shrink along the flow direction of the fluid and intersect at the rear edge position, so that the thickness of the outlet shell 9 gradually decreases, and the water flow around the outside of the guide tube 1 and the water flow in the inner flow channel finally converge at the rear edge position, and the rear edge part is smoothly transitioned to meet the mechanical properties and improve the anti-cavitation ability. The inner wall profile and the outer wall profile of the outlet shell 9 gradually shrink along the axial direction of the guide tube 1, and the gradually thinning structure of the outlet shell 9 along the length direction makes the flow direction of the internal flow field of the guide tube 1 and the external flow field gradually converge, which can reduce the stagnation area caused by the thickness of the outlet shell 9 and improve the outlet flow field characteristics of the integrated motor propulsion device.

[0043] In an embodiment of the present invention, the guide duct 1 is formed by connecting an inlet casing 7, an annular casing 8 and an outlet casing 9 in sequence. The impeller 3 and the rotor assembly are located in the accommodation space surrounded by the inner wall surface of the annular casing 8, and the stationary impeller 4 is located in the accommodation space surrounded by the inner wall surface of the outlet casing 9. The airfoil profile of the outlet casing 9 increases the static pressure of the fluid in the outer wall area of ​​the outlet casing 9, thereby giving the integrated motor propulsion device a certain thrust in the horizontal direction, which is beneficial to improving the propulsion efficiency of the integrated motor propulsion device.

[0044] like Figure 1 and Figure 4 As shown, in an optional embodiment, the inner wall surface of the inlet shell 7 encloses a bell-mouth-shaped flow channel.

[0045] Specifically, the two opposite ends of the inlet shell 7 are defined as the first end of the inlet shell 7 and the second end of the inlet shell 7, respectively. The first end of the inlet shell 7 is far away from the annular shell 8, and the second end of the inlet shell 7 is close to the annular shell 8. The fluid enters the inner flow channel of the guide tube 1 from the first end of the inlet shell 7. From the first end of the inlet shell 7 to the second end of the inlet shell 7, the inner wall surface of the inlet shell 7 has a profile that gradually contracts toward the axial direction of the guide tube 1, so that the inner wall surface of the inlet shell 7 forms a bell-shaped inlet channel 11.

[0046] The inlet shell 7 adopts a streamlined design, and the inner wall surface of the inlet shell 7 is composed of an arc segment and a spline curve segment. The arc segment is used to achieve a smooth transition between the outer wall surface of the inlet shell 7 and the inner wall surface of the inlet shell 7. One end of the spline curve segment is tangent to the arc segment 701, and the other end of the spline curve segment is tangent to the straight profile segment of the inner flow channel of the flow guide tube 1. Thus, the inner wall surface of the inlet shell 7 forms a bell-shaped inlet channel 11, which has high drainage capacity and low resistance characteristics, so that the external fluid can smoothly flow into the inner flow channel of the flow guide tube 1, so that the flow guide tube 1 has excellent hydrodynamic performance.

[0047] In the embodiment of the present invention, the inner wall surface of the inlet shell 7 forms a bell-mouth-shaped inlet channel 11. The bell-mouth-shaped inlet channel 11 has high drainage capacity and low resistance characteristics, so that the external fluid can flow smoothly into the inner flow channel of the guide tube 1, which is beneficial to improving the drainage capacity of the guide tube 1 for the fluid.

[0048] like Figure 1 and Figure 4 As shown, in an optional embodiment, it is characterized in that the profile of the end of the support shaft 6 located at the outlet housing 9 is adapted to the profile of the inner wall surface of the outlet housing 9.

[0049] Specifically, the support shaft 6 is coaxially arranged with the guide tube 1, the stationary impeller 4 is installed at the outlet casing 9, the stationary impeller 4 includes a plurality of blades, and the plurality of blades are circumferentially arranged around the axis of the support shaft 6, one end of the blade is connected to the support shaft 6, and the other end of the blade is connected to the inner wall surface of the outlet casing 9.

[0050] The inner wall surface of the outlet housing 9 gradually shrinks along the axial direction of the support shaft 6, and the portion of the support shaft 6 corresponding to the inner wall surface of the outlet housing 9 has a profile that matches the profile of the inner wall surface of the outlet housing 9, that is, the diameter size of the tail area of ​​the support shaft 6 gradually decreases along the axial direction of the support shaft 6. The profile of the tail area of ​​the support shaft 6 is matched with the profile of the inner wall surface of the outlet housing 9, so that the flow channel area at each position along the axial direction of the guide tube 1 at the outlet end of the static impeller 4 is roughly equal, which can effectively avoid the sudden expansion or contraction of the flow channel area at the outlet end of the static impeller 4. An equal-section outlet flow channel 12 is formed at the outlet end of the static impeller 4, and the equal-section outlet flow channel 12 is conducive to improving the stability of the flow field at the outlet end of the static impeller 4 and the uniformity of the streamlines, improving the thrust of the static impeller 4, and at the same time helping to suppress noise.

[0051] In an embodiment of the present invention, the profile of the support shaft 6 corresponding to the outlet end of the stationary impeller 4 is adapted to the profile of the inner wall surface of the outlet casing 9, so that an equal-section outlet channel 12 is formed at the outlet end of the stationary impeller 4, which is beneficial to improving the stability of the flow field at the outlet end of the stationary impeller 4, and further beneficial to improving the propulsion efficiency of the integrated motor propulsion device, and at the same time beneficial to suppressing the noise of the integrated motor propulsion device.

[0052] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in an optional embodiment, the flow guide 1 further includes a plurality of vortex generators 10 ; the plurality of vortex generators 10 are circumferentially arranged on the outer wall surface of the outlet housing 9 around the axis of the flow guide 1 .

[0053] Specifically, the outer wall profile of the outlet shell 9 gradually shrinks along the axis direction of the guide tube 1. When the water flow of the external bypass 13 at the outer wall of the guide tube 1 flows through the outer wall area of ​​the outlet shell 9, the streamlines are bent accordingly, and turbulent boundary layer separation may occur, thereby affecting the overall hydrodynamic performance of the integrated motor propulsion device. A plurality of vortex generators 10 are arranged circumferentially on the outer wall of the outlet shell 9 around the axis of the guide tube 1. The vortex generators 10 are installed in the transition area between the straight profile section and the airfoil profile section on the outer wall of the outlet shell 9.

[0054] The vortex generator 10 is a low-resistance, low-aspect-ratio winglet with a strong wingtip vortex. After the wingtip vortex with higher energy mixes with the low-energy boundary layer flow downstream, the energy is transferred to the boundary layer, so that the boundary layer in the adverse pressure gradient can continue to adhere to the outer wall of the guide tube 1, eliminating or delaying the separation of the turbulent boundary layer, which is beneficial to improving the thrust performance of the guide tube 1.

[0055] In an embodiment of the present invention, a plurality of vortex generators 10 are arranged in a circumferential direction around the axis of the flow duct 1 on the outer wall surface of the outlet casing 9 and are located in the transition area between the straight profile section and the airfoil profile section, which can effectively suppress the turbulent boundary layer flow separation at the outer wall surface of the outlet casing 9, thereby facilitating the improvement of the thrust performance of the flow duct 1.

[0056] like Figure 2 As shown, in an optional embodiment, a first positioning structure is provided between the opposite walls of the inlet shell 7 and the annular shell 8 , and a second positioning structure is provided between the opposite walls of the annular shell 8 and the outlet shell 9 .

[0057] Specifically, the inlet shell 7 has a first mounting surface, which is arranged perpendicularly to the axis of the guide tube 1; the annular shell 8 has a first end surface and a second end surface opposite to each other, which are arranged in parallel; the outlet shell 9 has a second mounting surface, which is arranged perpendicularly to the axis of the guide tube 1, the first end surface of the annular shell 8 is connected to the first mounting surface of the inlet shell 7, and the second end surface of the annular shell 8 is connected to the second mounting surface of the outlet shell 9.

[0058] A first positioning structure is provided between the first mounting surface and the first end surface. For example, the first mounting surface is provided with a first positioning groove, which is circumferentially arranged on the first mounting surface around the axis of the inlet shell 7; the first end surface is provided with a first positioning boss, which is circumferentially arranged on the first end surface around the axis of the annular shell 8, and the first positioning boss and the first positioning groove are adapted. During assembly, the first positioning boss is inserted into the first positioning groove, and then the inlet shell 7 and the annular shell 8 are connected by fasteners, which is conducive to ensuring assembly accuracy and improving assembly efficiency. The first positioning boss can also be provided on the first mounting surface, and the first positioning groove can be provided on the first end surface to facilitate the assembly of the inlet shell 7 and the annular shell 8.

[0059] A second positioning structure is provided between the second mounting surface and the second end surface. For example, the second mounting surface is provided with a second positioning groove, which is circumferentially arranged on the second mounting surface around the axis of the outlet housing 9; the second end surface is provided with a second positioning boss, which is circumferentially arranged on the second end surface around the axis of the annular housing 8, and the second positioning boss is adapted to the second positioning groove. During assembly, the second positioning boss is inserted into the second positioning groove, and then the annular housing 8 and the outlet housing 9 are connected by fasteners, which is conducive to ensuring assembly accuracy and improving assembly efficiency. A second positioning boss can also be provided on the second mounting surface, and a second positioning groove can be provided on the second end surface to facilitate the assembly of the annular housing 8 and the outlet housing 9.

[0060] In the embodiment of the present invention, a first positioning structure is provided between the relative wall surfaces of the inlet shell 7 and the annular shell 8, and a second positioning structure is provided between the relative wall surfaces of the annular shell 8 and the outlet shell 9. The first positioning structure and the second positioning structure are helpful to ensure the assembly accuracy of the guide tube 1 and improve the assembly efficiency.

[0061] In an optional embodiment, the inlet shell 7 includes a first supporting skeleton and a first skin; the first skin forms an inner profile of the inlet shell 7 , and the first supporting skeleton forms an outer profile of the inlet shell 7 .

[0062] Specifically, the inlet shell 7 is composed of a first support frame and a first skin. The first support frame is made of materials such as nickel aluminum bronze or stainless steel, and the first skin is made of lightweight materials such as carbon fiber composite materials or fiberglass. The first support frame is mainly used to form the external profile of the inlet shell 7 to withstand the pressure of the external fluid of the guide tube 1, and the first skin is mainly used to form the internal profile of the inlet shell 7, so that the inlet flow channel has high drainage capacity and low resistance characteristics. The first support frame and the first skin are connected by fasteners, which can be fastening screws.

[0063] In the embodiment of the present invention, the inlet shell 7 is formed by splicing a first supporting frame and a first skin, which is beneficial to reducing the weight of the flow guide duct 1 while meeting the structural strength, thereby achieving lightweighting of the flow guide duct 1.

[0064] like Figure 5 and Figure 6 As shown, in an optional embodiment, the first supporting skeleton includes a first cylindrical outer plate 703 and a first connecting plate 704 connected to the first cylindrical outer plate 703, and the first connecting plate 704 is connected to an end face of the annular shell 8; the first skin has a spline curve segment 702 and an arc segment 701, one end of the spline curve segment 702 is connected to the first connecting plate 704, and the other end of the spline curve segment 702 is connected to an end of the first cylindrical outer plate 703 away from the annular shell 8 through the arc segment 701.

[0065] Specifically, the thickness of the first cylindrical outer plate 703 and the first connecting plate 704 is set according to actual needs. The first cylindrical outer plate 703 is used to form the external profile of the inlet shell 7, and the first connecting plate 704 is connected to the first end face of the annular shell 8. The first skin includes a spline curve segment 702 and an arc segment 701. The spline curve segment 702 forms the internal profile of the inlet shell 7. One end of the spline curve segment 702 is tangent to the straight profile segment of the inner flow channel of the guide tube 1, and the other end of the spline curve segment 702 is tangent to the arc segment 701. A boss is provided on the side of the first connecting plate 704 away from the annular shell 8. The boss is close to the inner edge of the first connecting plate 704, and the boss is provided with a threaded hole. A countersunk hole is opened at one end of the spline curve segment 702. One end of the spline curve segment 702 is connected to the first connecting plate 704 through a fastener, and the fastener can be a countersunk screw. The spline curve segment 702 can be integrally formed with the arc segment 701. The arc radius of the arc segment 701 is within a range of one sixth to one quarter of the thickness of the guide tube 1. A countersunk hole is provided at one end of the arc segment 701 away from the spline curve segment 702. A threaded hole is provided at one end of the first cylindrical outer plate 703 away from the annular shell 8. The arc segment 701 is connected to the first cylindrical outer plate 703 through a fastener 706. The fastener 706 can be a countersunk screw. The first connecting plate 704 is provided with a first positioning groove 705. The first end surface of the annular shell 8 is provided with a first positioning boss 801. The first positioning groove 705 and the first positioning boss 801 are matched to facilitate the assembly of the inlet shell 7 and the annular shell 8.

[0066] In the embodiment of the present invention, the first skin constructs the streamlined profile of the inlet shell 7, and the first supporting frame ensures the structural strength of the inlet shell 7, so that the guide tube 1 has better hydrodynamic performance and is conducive to the lightweight of the guide tube 1.

[0067] In an optional embodiment, the outlet shell 9 includes a second supporting frame and a second skin; the second supporting frame forms a portion of the external profile and a portion of the internal profile of the outlet shell 9, and the second skin forms another portion of the external profile and another portion of the internal profile of the outlet shell 9.

[0068] Specifically, the outlet shell 9 is composed of a second support frame and a second skin, the second support frame is made of materials such as nickel aluminum bronze or stainless steel, and the second skin is made of lightweight materials such as carbon fiber composite materials or fiberglass. The internal profile of the outlet shell 9 is composed of a part of the second support frame and a part of the second skin, and the external profile of the outlet shell 9 is composed of another part of the second support frame and another part of the second skin.

[0069] In the embodiment of the present invention, the second supporting skeleton is used to ensure the structural strength of the outlet shell 9, and the second skin is mainly used to form the airfoil profile of the outlet shell 9. The outlet shell 9 is composed of the second supporting skeleton and the second skin. While meeting the structural strength, it is beneficial to reduce the weight of the guide duct 1 and realize lightweight of the guide duct 1.

[0070] like Figure 6 and Figure 7 As shown, in an optional embodiment, the second supporting skeleton includes a cylindrical inner plate 903, a second cylindrical outer plate 901 and a second connecting plate 902 connecting the cylindrical inner plate 903 and the second cylindrical outer plate 901, and the second connecting plate 902 is connected to the other end face of the annular shell 8; the second skin includes an inner skin 905 and an outer skin 906; the end of the cylindrical inner plate 903 away from the second connecting plate 902 is connected to the inner skin 905, and the end of the second cylindrical outer plate 901 away from the second connecting plate 902 is connected to the outer skin 906, and the inner skin 905 and the outer skin 906 have a smooth transition.

[0071] Specifically, the thickness of the cylindrical inner plate 903, the second cylindrical outer plate 901 and the second connecting plate 902 are set according to actual needs, the cylindrical inner plate 903 forms part of the internal profile of the outlet shell 9, the second cylindrical outer plate 901 forms a straight profile segment of the outer wall of the outlet shell 9, the inner edge of the second connecting plate 902 is connected to the cylindrical inner plate 903, and the outer edge of the second connecting plate 902 is connected to the second cylindrical outer plate 901, and the connection between the second cylindrical inner plate 903 and the second cylindrical outer plate 901 is realized through the second connecting plate 902. The second connecting plate 902 is used to connect with the second end face of the annular shell 8, and the second connecting plate 902 is provided with a second positioning groove 904 on the side facing the annular shell 8, and the second end face of the annular shell 8 is provided with a second positioning boss 802, and the second positioning groove 904 and the first positioning boss 802 are adapted to facilitate the assembly of the annular shell 8 and the outlet shell 9.

[0072] The second skin includes an inner skin 905 and an outer skin 906, wherein the inner skin 905 forms another part of the internal profile of the outlet shell 9, and the outer skin 906 forms another part of the external profile of the outlet shell 9. The first end of the inner skin 905 is connected to the end of the cylindrical inner plate 903 away from the second connecting plate 902 by a fastener, the second end of the inner skin 905 and the second end of the outer skin 906 are in an arc transition, and the first end of the outer skin 906 is connected to the second cylindrical outer plate 901 by a fastener, and the fastener can be a countersunk screw 907. The inner skin 905 and the outer skin 906 can be integrally formed. Thus, the cylindrical inner plate 903 and the inner skin 905 are spliced ​​to form the internal profile of the outlet shell 9, and the second cylindrical outer plate 901 and the outer skin 906 are spliced ​​to form the external profile of the outlet shell 9.

[0073] In an embodiment of the present invention, the airfoil profile of the outlet shell 9 is jointly constructed by the second skin and the second supporting frame, and the structural strength of the outlet shell 9 is ensured by the second supporting frame, so that the guide duct 1 has better hydrodynamic performance and is conducive to the lightweight of the guide duct 1.

[0074] like Figure 7 As shown, in an optional embodiment, a rib plate is provided on the wall surface of the cylindrical inner plate 903 facing away from the support shaft 6 .

[0075] Specifically, rib plates are provided on the wall surface of the cylindrical inner plate 903 facing away from the support shaft 6, and the number of rib plates is set according to actual needs. The blade top of the static impeller 4 is connected to the inner wall surface of the cylindrical inner plate 903, and a plurality of rib plates are arranged at intervals on the outer wall surface of the cylindrical inner plate 903 along the extension direction of the cylindrical inner plate 903, which is beneficial to ensuring the strength of the static impeller 4 and at the same time beneficial to improving the structural strength of the outlet casing 9.

[0076] Furthermore, the inner space enclosed by the first support frame and the first skin can be filled with light pressure-bearing materials to improve the pressure-bearing capacity of the first skin. The inner space enclosed by the second support frame and the second skin can also be filled with light pressure-bearing materials to improve the pressure-bearing capacity of the second skin.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flow guide tube for an integrated motor propulsion device, characterized in that: include: an inlet casing, an annular casing, and an outlet casing; The inlet housing, the annular housing and the outlet housing are sequentially connected to form a flow guide pipe, and the flow guide pipe has an accommodating space for installing a support shaft, a moving impeller, a stationary impeller and a rotor assembly; The support shaft is arranged in the guide tube and is coaxially arranged with the guide tube. The impeller is rotatably connected to the support shaft. The rim of the impeller is connected to the rotor assembly. The rotor assembly and the impeller are located at the annular housing. One end of the stationary impeller is connected to the support shaft, and the other end is connected to the inner wall surface of the outlet housing. The inner wall surface of the outlet shell and the outer wall surface of the outlet shell gradually shrink toward the axial direction of the guide tube from one end close to the annular shell to one end far away from the annular shell, so that the outlet shell has an airfoil profile.

2. The flow guide tube for the integrated motor propulsion device according to claim 1, characterized in that: The inner wall surface of the inlet shell forms a bell-shaped flow channel.

3. The flow guide tube for the integrated motor propulsion device according to claim 1, characterized in that: The profile of the end of the support shaft located at the outlet housing is matched with the profile of the inner wall surface of the outlet housing.

4. The flow guide tube for the integrated motor propulsion device according to claim 1, characterized in that: The flow guide tube also includes a plurality of vortex generators; The plurality of vortex generators are circumferentially arranged on the outer wall surface of the outlet shell around the axis of the flow guide tube.

5. The flow guide tube for the integrated motor propulsion device according to claim 1, characterized in that: A first positioning structure is provided between the inlet shell and the opposite wall surface of the annular shell, and a second positioning structure is provided between the annular shell and the opposite wall surface of the outlet shell.

6. The flow guide tube for an integrated motor propulsion device according to any one of claims 1 to 5, characterized in that: The inlet shell includes a first support frame and a first skin; The first skin forms an inner profile of the inlet shell, and the first supporting skeleton forms an outer profile of the inlet shell.

7. The flow guide tube for the integrated motor propulsion device according to claim 6, characterized in that: The first supporting frame includes a first cylindrical outer plate and a first connecting plate connected to the first cylindrical outer plate, wherein the first connecting plate is connected to an end surface of the annular shell; The first skin has a spline curve segment and a circular arc segment, one end of the spline curve segment is connected to the first connecting plate, and the other end of the spline curve segment is connected to an end of the first cylindrical outer plate away from the annular shell through the circular arc segment.

8. The flow guide tube for an integrated motor propulsion device according to any one of claims 1 to 5, characterized in that: The outlet shell includes a second support frame and a second skin; The second supporting skeleton forms a part of the external profile and a part of the internal profile of the outlet shell, and the second skin forms another part of the external profile and another part of the internal profile of the outlet shell.

9. The flow guide tube for the integrated motor propulsion device according to claim 8, characterized in that: The second supporting frame includes a cylindrical inner plate, a second cylindrical outer plate, and a second connecting plate connecting the cylindrical inner plate and the second cylindrical outer plate, wherein the second connecting plate is connected to the other end surface of the annular shell; The second skin includes an inner skin and an outer skin; one end of the cylindrical inner plate away from the second connecting plate is connected to the inner skin, and one end of the second cylindrical outer plate away from the second connecting plate is connected to the outer skin, and the inner skin and the outer skin are smoothly transitioned.

10. The flow guide tube for the integrated motor propulsion device according to claim 9, characterized in that: A rib plate is provided on the wall surface of the cylindrical inner plate away from the support shaft.

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