Integrated electric motor propulsion with efficient cooling

Abstract

The present invention provides an integrated motor propulsion device with high efficiency cooling, comprising: a flow guide housing, an impeller, an integrated motor and a heat exchanger; a support shaft coaxially arranged therewith is provided in the flow guide housing, and the impeller is rotatably connected to the support shaft; the integrated motor is embedded in the flow guide housing, and the integrated motor comprises a rotor assembly and a stator assembly, and the rim of the impeller is connected to the rotor assembly; an air gap channel is formed between the stator assembly and the rotor assembly, and the air gap channel comprises a longitudinal annular channel and an inlet annular channel and an outlet annular channel connected at two ends opposite to the longitudinal annular channel; the stator and the heat exchanger are both arranged in the stator housing, and the heat exchanger has an evaporation section and a condensation section connected to each other, and the evaporation section is arranged close to the stator. In the integrated motor propulsion device of the present invention, the heat exchanger accelerates the rate at which the heat of the stator is transferred to the air gap channel, improves the cooling efficiency of the stator assembly, and is conducive to ensuring the reliability of the operation of the integrated motor propulsion device.

Description

Technical Field

[0001] The invention relates to the technical field of ship propulsion, and in particular to an integrated motor propulsion device with high efficiency cooling. Background Art

[0002] The integrated motor propulsion device uses a rim-driven motor installed inside the shell to drive the propeller blade assembly to rotate and work, generating the thrust required to drive the ship to sail. The rim-driven motor is the prime mover that converts the input electrical energy of the integrated motor propulsion device into rotational mechanical energy, and mainly includes a stator assembly and a rotor assembly. An annular air gap of a certain size is formed between the stator assembly and the rotor assembly. The annular air gap is a magnetic circuit coupling channel between the stator assembly and the rotor assembly, and the annular air gap also serves as a cooling channel. The cooling fluid flows through the annular air gap between the stator assembly and the rotor assembly, performs convective heat exchange with the stator assembly and the rotor assembly, and removes the heat of the stator assembly and the rotor assembly.

[0003] The air gap size of the annular air gap is an important parameter of the integrated motor propulsion device. Under a certain air gap size, the key point to limit the heat dissipation of the motor is how to quickly transfer the heat of the motor to the cooling fluid in the air gap channel. In the prior art, the motor housing is mostly made of materials with low thermal conductivity such as stainless steel. The heat generated by the stator assembly and the rotor assembly is transferred to the air gap channel at a slow rate, which in turn affects the overall heat dissipation of the motor. Summary of the invention

[0004] The present invention provides an integrated motor propulsion device with high efficiency cooling, so as to solve the problem of poor heat dissipation effect of the existing propulsion device.

[0005] The present invention provides an integrated motor propulsion device with high efficiency cooling, comprising: a flow guide casing, an impeller, an integrated motor and a heat exchanger;

[0006] A support shaft coaxially arranged therewith is provided in the guide housing, and the impeller is rotatably connected to the support shaft;

[0007] The integrated motor is embedded in the flow guide housing, and includes a rotor assembly and a stator assembly, and the rim of the impeller is connected to the rotor assembly; an air gap channel is formed between the stator assembly and the rotor assembly, and the air gap channel includes a longitudinal annular channel and an inlet annular channel and an outlet annular channel connected at two ends opposite to the longitudinal annular channel;

[0008] The stator assembly includes a stator and a stator shell. The stator and the heat exchange element are both arranged in the stator shell. The heat exchange element has an evaporation section and a condensation section that are interconnected. The evaporation section is arranged close to the stator, and the condensation section is arranged close to the air gap channel.

[0009] According to an integrated motor propulsion device with high efficiency cooling provided by the present invention, the heat exchange element comprises a plurality of heat exchange tubes, and the plurality of heat exchange tubes are arranged in the stator housing in an annular direction around the axis of the flow guide housing;

[0010] The heat exchange tube has a shape that matches the air gap channel, the evaporation section of the heat exchange tube is arranged close to the stator, and the condensation section of the heat exchange tube is arranged close to the inlet annular channel or the outlet annular channel.

[0011] According to an integrated motor propulsion device with high efficiency cooling provided by the present invention, the heat exchange tube comprises a straight section and two bent sections formed by bending opposite ends of the straight section;

[0012] The straight section is arranged close to the stator; one of the two bent sections is arranged close to the inlet annular channel, and the other is arranged close to the outlet annular channel.

[0013] According to an integrated motor propulsion device with high efficiency cooling provided by the present invention, the heat exchange element comprises a first vapor chamber;

[0014] The first heat spreader is arranged in the stator housing in an annular direction around the axis of the guide housing, the evaporation section of the first heat spreader is close to the side of the stator facing the rotor assembly, and the condensation section of the first heat spreader is close to the longitudinal annular channel.

[0015] According to an integrated motor propulsion device with high-efficiency cooling provided by the present invention, the first heat spreader is ring-shaped, and the outer wall surface of the first heat spreader is arranged to fit the inner wall surface of the stator.

[0016] According to an integrated motor propulsion device with high efficiency cooling provided by the present invention, the heat exchange member further comprises a second heat sink;

[0017] The second heat spreader is arranged in the stator shell in a circumferential direction around the axis of the flow guide shell, the evaporation section of the second heat spreader is close to the side of the stator away from the rotor assembly, and the condensation section of the second heat spreader is close to the outer wall of the flow guide shell.

[0018] According to an integrated motor propulsion device with high-efficiency cooling provided by the present invention, the second heat spreader is ring-shaped, and the inner wall surface of the second heat spreader is arranged to fit the outer wall surface of the stator.

[0019] According to an integrated motor propulsion device with high efficiency cooling provided by the present invention, a micro-groove structure is formed on the outer wall surface of the flow guide shell.

[0020] According to an efficient cooling integrated motor propulsion device provided by the present invention, the inlet annular channel is a labyrinth channel.

[0021] According to an efficient cooling integrated motor propulsion device provided by the present invention, the outlet annular channel is a labyrinth channel.

[0022] The invention provides an integrated motor propulsion device with high efficiency cooling, wherein the rotor assembly and the stator assembly are embedded in a flow guide housing, the inner wall surface of the rotor housing is connected to the edge of the impeller, an air gap channel is formed between the rotor assembly and the stator assembly, and a heat exchanger is built into the stator housing. The heat exchanger has an evaporation section and a condensation section that are interconnected, the evaporation section is arranged close to the stator, and the condensation section is arranged close to the air gap channel or the outer wall surface of the flow guide housing. The heat exchanger accelerates the rate at which the heat of the stator is transferred to the air gap channel, and the heat is further conducted out through the cooling fluid in the air gap channel, thereby improving the cooling efficiency of the stator assembly, and thus facilitating the reliability of the operation of the integrated motor propulsion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 is a cross-sectional schematic diagram of the integrated motor propulsion device with high efficiency cooling provided by the present invention;

[0025] Figure 2 The present invention shows Figure 1 One of the partial enlarged structural diagrams at A in the middle;

[0026] Figure 3 The present invention shows Figure 1 The second schematic diagram of the local enlarged structure at A in the middle;

[0027] Figure 4 The present invention shows Figure 3 A partial enlarged structural diagram of the left view at B in the middle;

[0028] Figure numerals: 1: guide casing; 2: stator assembly; 201: stator; 202: stator casing; 3: rotor assembly; 301: rotor; 302: rotor casing; 4: impeller; 5: stationary impeller; 6: bearing assembly; 7: support shaft; 8: air gap channel; 801: inlet annular channel; 802: longitudinal annular channel; 803: outlet annular channel; 9: heat exchange tube; 901: straight section; 902: bent section; 10: first heat spreader; 11: second heat spreader; 12: micro groove structure. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] Combine the following Figures 1 to 4 An integrated electric motor propulsion device with efficient cooling according to an embodiment of the present invention is described.

[0032] like Figure 1 As shown, an integrated motor propulsion device with high efficiency cooling provided by an embodiment of the present invention comprises: a flow guide casing 1, an impeller 4, an integrated motor and a heat exchanger; a support shaft 7 coaxially arranged therewith is provided in the flow guide casing 1, and the impeller 4 is connected to the support shaft 7 by rotation; the integrated motor is embedded in the flow guide casing 1, and the integrated motor comprises a rotor assembly 3 and a stator assembly 2, and the rim of the impeller 4 is connected to the rotor assembly 3; an air gap channel 8 is formed between the stator assembly 2 and the rotor assembly 3, and the air gap channel 8 comprises a longitudinal annular channel 802 and an inlet annular channel 801 and an outlet annular channel 803 connected at two ends opposite to the longitudinal annular channel 802; the stator assembly 2 comprises a stator 201 and a stator casing 202, the stator 201 and the heat exchanger are both arranged in the stator casing 202, and the heat exchanger has an evaporation section and a condensation section which are connected to each other, the evaporation section is arranged close to the stator 201, and the condensation section is arranged close to the air gap channel 8.

[0033] Specifically, a support shaft 7 arranged along the axis of the guide housing 1 is provided inside the guide housing 1, and the support shaft 7 is connected to the guide housing 1 through a stationary impeller 5, and the impeller 4 is rotatably connected to the support shaft 7 through a bearing assembly 6. The two opposite ends of the guide housing 1 are defined as the inlet end of the guide housing 1 and the outlet end of the guide housing 1, and the fluid flows in from the inlet end of the guide housing 1 and flows out from the outlet end of the guide housing 1. The integrated motor includes a rotor assembly 3 and a stator assembly 2, and the rotor assembly 3 includes a rotor 301 and a rotor housing 302, etc. The rotor 301 is built in the rotor housing 302, and the rotor housing 302 is a shielding sleeve of the rotor 301, and the rotor 301 includes a rotor core and a rotor winding; the stator assembly 2 includes a stator 201 and a stator housing 202, and the stator 201 is built in the stator housing 202, and the stator housing 202 is a shielding sleeve of the stator 201, and the stator 201 includes a stator core and a stator winding.

[0034] An annular groove is provided on the inner wall of the flow guide housing 1, and the rotor assembly 3 and the stator assembly 2 are installed in the annular groove. The stator assembly 2 is arranged in close contact with the groove bottom and the side groove wall of the annular groove, and an air gap channel 8 is formed between the outer wall surface of the rotor housing 302 and the inner wall surface of the stator housing 202. The air gap channel 8 includes a longitudinal annular channel 802 and a transverse annular channel connected to the longitudinal annular channel 802. The extension direction of the longitudinal annular channel 802 is consistent with the axial direction of the flow guide housing 1. The transverse annular channel close to the outlet end of the flow guide housing 1 is defined as the inlet annular channel 801, and the transverse annular channel close to the inlet end of the flow guide housing 1 is defined as the outlet annular channel 803. When conveying fluid, the rotor assembly 3 drives the impeller 4 to rotate and do work and increase the pressure of the fluid. The flow field pressure at the rear end of the impeller 4 is higher than the flow field pressure at the front end of the impeller 4. The rear end of the impeller 4 is close to the outlet end of the guide housing 1, and the front end of the impeller 4 is close to the inlet end of the guide housing 1. Driven by this pressure difference, part of the fluid in the guide housing 1 flows in from the inlet annular channel 801, and fully exchanges heat with the rotor assembly 3 and the stator assembly 2 during the process of flowing through the longitudinal annular channel 802, and then flows out from the outlet annular channel 803 to the channel of the guide housing 1, and the heat generated by the integrated motor due to copper loss, iron loss and friction loss is discharged. This part of the fluid is defined as cooling fluid. A static impeller 5 is also installed in the guide housing 1. The static impeller 5 is close to the outlet end of the guide housing 1. The static impeller 5 is used to recover the circumferential velocity of the fluid, and after increasing the static pressure of the fluid, the fluid is sent out from the outlet end of the guide housing 1.

[0035] The air gap size of the air gap channel 8 is one of the important parameters of the integrated motor propulsion device. Under a certain air gap size, the key point to limit the heat dissipation of the motor is how to quickly transfer the heat of the motor to the cooling fluid in the air gap channel 8. In the prior art, the motor housing is mostly made of materials with low thermal conductivity such as stainless steel. In order to reduce the weight of the propulsion device, some lightweight composite materials are even used, and their thermal conductivity will be even lower, affecting the overall heat dissipation of the motor. Poor heat dissipation of the motor will further affect the service life of the motor.

[0036] The outer wall surface of the rotor housing 302 and the inner wall surface of the stator housing 202 form an air gap channel 8. During the operation of the integrated motor, the heat generated by the stator 201 is relatively large. A heat exchanger is arranged in the stator housing 202. The heat exchanger can be a heat exchange tube or a heat plate. The heat exchanger contains a heat exchange medium. The heat exchanger has an evaporation section and a condensation section that are interconnected. The evaporation section is arranged close to the stator 201, and the condensation section is arranged close to the inlet annular channel 801, the outlet annular channel 803 or the longitudinal annular channel 802. The heat exchange medium fully absorbs the heat generated by the stator 201 at the evaporation section and vaporizes under the heat. The vapor heat exchange medium flows from the evaporation section toward the condensation section. A cooling fluid flows in the air gap channel 8. The condensation section is arranged close to the air gap channel 8. The vapor heat exchange medium flows to the condensation section and condenses into a liquid heat exchange medium. The liquid heat exchange medium flows back to the evaporation section under the action of capillary force to exchange heat with the stator 201, thereby deriving the heat of the stator 201 through a cyclic operation. When the vaporous heat exchange medium flows to the condensation section and condenses into a liquid heat exchange medium, the heat released is transferred to the cooling fluid in the air gap channel 8, and the heat is further efficiently discharged through the cooling fluid.

[0037] By embedding a heat exchanger in the stator housing 202, the rate at which the heat generated by the stator 201 is transferred to the air gap channel 8 is accelerated. At the same time, after the integrated motor is shut down, the residual heat of the integrated motor can be transferred to the cooling fluid in the air gap channel 8 through the heat exchanger, effectively preventing the stator 201 from being damaged by excessive temperature. Furthermore, a heat exchanger can also be embedded in the rotor housing 302 to accelerate the rate at which the heat generated by the rotor 301 is transferred to the air gap channel 8.

[0038] In the embodiment of the present invention, the rotor assembly 3 and the stator assembly 2 are embedded in the flow guide housing 1, the inner wall surface of the rotor housing 302 is connected to the edge of the impeller 4, an air gap channel 8 is formed between the rotor assembly 3 and the stator assembly 2, and the heat exchanger is embedded in the stator housing 202. The heat exchanger has an evaporation section and a condensation section that are interconnected. The evaporation section is arranged close to the stator 201, and the condensation section is arranged close to the air gap channel 8. The heat exchanger accelerates the rate at which the heat of the stator 201 is transferred to the air gap channel 8, and the heat is further conducted out through the cooling fluid in the air gap channel 8, thereby improving the cooling efficiency of the stator assembly 2, and thus facilitating the reliability of the operation of the integrated motor propulsion device.

[0039] like Figure 2 As shown, in an optional embodiment, the heat exchange element includes a plurality of heat exchange tubes 9, which are arranged in a ring shape around the axis of the guide shell 1 in the stator shell 202; the heat exchange tube 9 has a shape adapted to the air gap channel 8, the evaporation section of the heat exchange tube 9 is arranged close to the stator 201, and the condensation section of the heat exchange tube 9 is arranged close to the inlet annular channel 801 or the outlet annular channel 803.

[0040] Specifically, a plurality of heat exchange tubes 9 are arranged in an annular direction around the axis of the flow guide housing 1, the number of heat exchange tubes 9 is two or more, the inner wall of the heat exchange tube 9 is provided with a porous capillary structure, the two ends of the heat exchange tube 9 are sealed, and the heat exchange medium can be a substance that is easily evaporated into a vapor state when heated and easily condensed into a liquid state when cooled, such as water, ammonia, methanol or acetone. The evaporation section of the heat exchange tube 9 is parallel to the axis of the flow guide housing 1, and the evaporation section of the heat exchange tube 9 is arranged close to the side of the stator 201 facing the rotor assembly 3, one end of the evaporation section is bent to form a bending section, the bending section is arranged close to the inlet annular channel 801, or the bending section is arranged close to the outlet annular channel 803, or the opposite ends of the evaporation section are respectively bent to form two bending sections, one of the two bending sections is arranged close to the inlet annular channel 801, and the other is arranged close to the outlet annular channel 803.

[0041] The evaporation section is close to the stator 201. The heat exchange medium absorbs heat in the evaporation section and vaporizes into steam. The steam flows to the condensation section under the action of pressure difference. After releasing latent heat in the condensation section, it condenses into liquid. The liquid heat exchange medium flows back to the evaporation section under the action of capillary force and continues to absorb heat and evaporate. This cycle repeats, and the heat of the stator 201 is extracted through the evaporation and condensation of the heat exchange medium. Multiple heat exchange tubes 9 are arranged in an annular direction, so that the heat of the stator 201 can be quickly and evenly transferred to the air gap channel 8, which is conducive to the efficient extraction of heat from the stator 201. At the same time, when individual heat exchange tubes 9 cannot work normally due to damage or other reasons, the remaining heat exchange tubes 9 can still ensure the efficient extraction of heat.

[0042] In an embodiment of the present invention, a plurality of heat exchange tubes 9 are arranged in a ring shape around the axis of the flow guide shell 1 in the stator shell 202. The evaporation section of the heat exchange tube 9 is arranged close to the stator 201, and the condensation section of the heat exchange tube 9 is arranged close to the inlet annular channel 801 or the outlet annular channel 803, which is beneficial to the efficient heat extraction of the stator 201, and further beneficial to ensuring the reliability of the operation of the integrated motor.

[0043] like Figure 2 As shown, in an optional embodiment, the heat exchange tube 9 includes a straight section 901 and two bent sections 902 formed by bending opposite ends of the straight section 901; the straight section 901 is arranged close to the stator 201; one of the two bent sections 902 is arranged close to the inlet annular channel 801, and the other is arranged close to the outlet annular channel 803.

[0044] Specifically, the heat exchange tube 9 includes a straight section 901 and two bent sections 902 that are interconnected. The length direction of the straight section 901 is consistent with the extension direction of the longitudinal annular channel 802. The two opposite ends of the straight section 901 are bent toward the inner wall surface of the flow guide shell 1 to form two bent sections 902. The two bent sections 902 are defined as a first bent section and a second bent section. The first bent section matches the shape of the inlet annular channel 801, and the second bent section matches the shape of the outlet annular channel 803. The straight section 901 is arranged close to the inner wall surface of the stator 201, and the straight section 901 is an evaporation section; the first bent section is arranged close to the inlet annular channel 801, and the second bent section is arranged close to the outlet annular channel 803. Cooling fluid flows in the inlet annular channel 801 and the outlet annular channel 803, and the first bent section and the second bent section are condensation sections.

[0045] The heat exchange medium at the straight section 901 absorbs the heat of the stator 201 and then vaporizes. The vapor heat exchange medium flows from the straight section 901 toward the first bending section and the second bending section under the action of the pressure difference, and is converted into a liquid heat exchange medium at the first bending section and the second bending section. The heat released when the vapor heat exchange medium condenses into a liquid heat exchange medium is transferred to the cooling fluid in the air gap channel 8 at the first bending section and the second bending section, and the heat is further extracted by the cooling fluid, thereby realizing efficient heat extraction of the stator 201. The liquid heat exchange medium flows back to the straight section 901 under the action of capillary force. The straight section 901 is arranged close to the inner wall surface of the stator 201, the first bending section is arranged close to the inlet annular channel 801, and the second bending section is arranged close to the outlet annular channel 803, which is conducive to realizing efficient heat extraction of the stator 201.

[0046] In an embodiment of the present invention, the heat exchange tube 9 includes a straight section 901 and two bent sections 902 which are interconnected. The straight section 901 is arranged close to the inner wall surface of the stator 201, and the two bent sections 902 are arranged close to the inlet annular channel 801 and the outlet annular channel 803, respectively, so that the heat of the stator 201 component 2 can be quickly transferred to the air gap channel 8, which is beneficial to the reliability of the operation of the integrated motor propulsion device.

[0047] like Figure 3 As shown, in an optional embodiment, the heat exchange element includes a first heat spreader 10; the first heat spreader 10 is arranged in a ring shape around the axis of the guide shell 1 in the stator shell 202, the evaporation section of the first heat spreader 10 is close to the side of the stator 201 facing the rotor assembly 3, and the condensation section of the first heat spreader 10 is close to the longitudinal annular channel 802.

[0048] Specifically, the first heat spreader 10 is arranged in a ring shape around the axis of the guide shell 1 in the stator shell 202. The first heat spreader 10 has two opposite walls, which are defined as the inner wall of the first heat spreader 10 and the outer wall of the first heat spreader 10. The outer wall of the first heat spreader 10 is close to the inner wall of the stator 201, and the outer wall of the first heat spreader 10 is the evaporation section; the inner wall of the first heat spreader 10 is close to the longitudinal annular channel 802, and the inner wall of the first heat spreader 10 is the condensation section.

[0049] The inner wall of the first heat spreader 10 is provided with a porous capillary structure, and the heat exchange medium in the first heat spreader 10 can be a substance that is easily evaporated into a vapor state when heated and easily condensed into a liquid state when cooled, such as water, ammonia, methanol or acetone. The heat exchange medium in the first heat spreader 10 absorbs the heat of the stator 201 at the outer wall surface of the first heat spreader 10 and vaporizes into steam. The steam flows to the inner wall surface of the first heat spreader 10 under the action of the pressure difference, and condenses into a liquid heat exchange medium at the inner wall surface of the first heat spreader 10. The liquid heat exchange medium flows back to the outer wall surface of the first heat spreader 10 under the action of capillary force, and continues to absorb heat and evaporate. This cycle is repeated, and the heat of the stator 201 is transferred to the inner wall surface of the first heat spreader 10 through the evaporation and condensation of the heat exchange medium. The heat released by the condensation of the heat exchange medium on the inner wall surface of the first heat spreader 10 is further transferred to the cooling fluid in the longitudinal annular channel 802. The cooling fluid further efficiently conducts the heat, thereby accelerating the transfer of heat from the stator 201 to the air gap channel 8 through the first heat spreader 10.

[0050] In an embodiment of the present invention, the first heat spreader 10 is embedded in the stator housing 202. The first heat spreader 10 is located between the longitudinal annular channel 802 and the stator 201. The outer wall surface of the first heat spreader 10 is arranged close to the inner wall surface of the stator 201. The inner wall surface of the first heat spreader 10 is arranged close to the longitudinal annular channel 802. The first heat spreader 10 can efficiently export the heat of the stator 201, which is beneficial to ensure the reliability of the operation of the integrated motor propulsion device.

[0051] In an optional embodiment, the first heat spreader 10 is ring-shaped, and the outer wall surface of the first heat spreader 10 is arranged to fit the inner wall surface of the stator 201 .

[0052] Specifically, the first heat spreader 10 is annular, and the length dimension of the first heat spreader 10 along the axial direction of the flow guide housing 1 is slightly larger than the length dimension of the stator 201 along the axial direction of the flow guide housing 1. The inner wall surface of the first heat spreader 10 is arranged close to the longitudinal annular channel 802, and the outer wall surface of the first heat spreader 10 is arranged close to the inner wall surface of the stator 201, which is conducive to uniformly and quickly transferring the heat of the stator 201 to the cooling fluid in the longitudinal annular channel 802.

[0053] like Figure 3As shown, in an optional embodiment, the heat exchange element also includes a second heat spreader 11; the second heat spreader 11 is arranged in a ring shape around the axis of the guide shell 1 in the stator shell 202, the evaporation section of the second heat spreader 11 is close to the side of the stator 201 away from the rotor assembly 3, and the condensation section of the second heat spreader 11 is close to the outer wall of the guide shell 1.

[0054] Specifically, the second heat spreader 11 is arranged in a ring shape around the axis of the flow guide shell 1 in the stator 201 shell 202, and the second heat spreader 11 has two opposite walls, which are defined as the inner wall of the second heat spreader 11 and the outer wall of the second heat spreader 11, respectively. The inner wall of the second heat spreader 11 is close to the outer wall of the stator 201, and the inner wall of the second heat spreader 11 is the evaporation section; the outer wall of the second heat spreader 11 is close to the outer wall of the flow guide shell 1, and the outer wall of the second heat spreader 11 is the condensation section.

[0055] The inner wall of the second heat spreader 11 is provided with a porous capillary structure, and the heat exchange medium in the second heat spreader 11 can be a substance such as water, ammonia, methanol or acetone, which is easily evaporated into a vapor state when heated and easily condensed into a liquid state when cooled. The heat exchange medium in the second heat spreader 11 absorbs the heat of the stator 201 at the inner wall surface of the second heat spreader 11 and vaporizes into steam. The steam flows to the outer wall surface of the second heat spreader 11 under the action of the pressure difference, and condenses into a liquid heat exchange medium at the outer wall surface of the second heat spreader 11. The liquid heat exchange medium flows back to the inner wall surface of the second heat spreader 11 under the action of capillary force, and continues to absorb heat and evaporate. This cycle is repeated, and the heat of the stator 201 is transferred to the outer wall surface of the second heat spreader 11 through the evaporation and condensation of the heat exchange medium. The heat released by the condensation of the heat exchange medium at the outer wall surface of the second heat spreader 11 is further transferred to the external environment or the fluid at the outer wall surface of the flow guide shell 1.

[0056] When the integrated motor propulsion device is applied to a ship, the inner wall and the outer wall of the guide shell 1 are in contact with seawater, and the first heat spreader 10 and the second heat spreader 11 are respectively arranged on the inner and outer sides of the stator 201. The heat absorbed by the first heat spreader 10 can be discharged by the cooling fluid in the air gap channel 8, and the heat absorbed by the second heat spreader 11 can be discharged by the seawater outside the guide shell 1, which is beneficial to further enhance the heat discharge of the stator 201.

[0057] In an embodiment of the present invention, the first heat spreader 10 and the second heat spreader 11 are respectively arranged on the inner and outer sides of the stator 201. The side of the first heat spreader 10 facing away from the stator 201 is close to the longitudinal annular channel 802, and the side of the second heat spreader 11 facing away from the stator 201 is close to the outer wall surface of the guide shell 1, which is beneficial to the efficient heat dissipation of the stator 201 and further improving the cooling efficiency of the stator assembly 2.

[0058] In an optional embodiment, the second heat spreader 11 is ring-shaped, and the inner wall surface of the second heat spreader 11 is disposed in close contact with the outer wall surface of the stator 201 .

[0059] Specifically, the second heat spreader 11 is annular, and the length dimension of the second heat spreader 11 along the axial direction of the flow guide housing 1 is slightly larger than the length dimension of the stator 201 along the axial direction of the flow guide housing 1. The inner wall surface of the second heat spreader 11 is arranged close to the outer wall surface of the stator 201, and the outer wall surface of the second heat spreader 11 is arranged close to the outer wall surface of the flow guide housing 1, which is conducive to uniformly and quickly transferring the heat of the stator 201 to the outside of the flow guide housing 1.

[0060] like Figure 4 As shown, in an optional embodiment, a micro-groove structure 12 is formed on the outer wall surface of the flow guide housing 1 .

[0061] Specifically, a micro-groove structure 12 is provided on the outer wall surface of the flow guide housing 1. The size of the micro-groove depression is not specifically limited. The length dimension of the micro-groove along the axial direction of the flow guide housing 1 is similar to the length dimension of the second heat spreader 11. The micro-groove increases the heat exchange area of ​​the second heat spreader 11 and the flow guide housing 1 near the second heat spreader 11, accelerates the process of heat exchange medium from vapor to liquid, improves the condensation efficiency of vapor heat exchange medium, and then improves the circulation rate of heat exchange medium in the second heat spreader 11, which is conducive to further improving the cooling efficiency of the stator assembly 2. Furthermore, the micro-groove structure 12 is also conducive to reducing the flow resistance of the fluid outside the flow guide housing 1.

[0062] like Figure 2 and Figure 3 As shown, in an optional embodiment, the inlet annular channel 801 is a labyrinth channel.

[0063] Specifically, a revolving groove is formed on the inner wall surface of the stator housing 202, and the side groove wall of the revolving groove extends from the inner wall surface of the stator housing 202 toward the outer wall surface of the stator housing 202 along the radial direction of the stator housing 202 to form a plurality of bending sections, and the plurality of bending sections form a plurality of recessed portions. The two opposite end surfaces of the rotor housing 302 have a plurality of protrusions matching the plurality of recessed portions, and the plurality of protrusions are arranged one-to-one with the plurality of recessed portions, and the protrusions are embedded in the recessed portions, and there is a gap between the protrusions and the recessed portions, so that the inlet annular channel 801 forms a labyrinth channel, and further, the outlet annular channel 803 also forms a labyrinth channel.

[0064] The two opposite end faces of the rotor housing 302 and the inner wall of the stator housing 202 form a labyrinth channel. When the cooling fluid flows in from the inlet annular channel 801, the labyrinth channel can effectively intercept impurities such as mud, shell fragments and suspended matter in the seawater, and prevent the impurities from entering the air gap channel 8 to wear and scratch the rotor housing 302 and the stator housing 202, thereby ensuring the reliable operation of the integrated motor. The outlet annular channel 803 is also a labyrinth channel, which can prevent impurities in the fluid from flowing into the air gap channel 8 from the outlet annular channel 803 due to unexpected conditions. The heat exchange tube 9 or the first heat spreader 10 can accelerate the transfer of heat from the stator assembly 2 to the air gap channel 8. The inlet annular channel 801 and the outlet annular channel 803 are set as labyrinth channels. While the heat of the stator assembly 2 and the rotor assembly 3 is extracted by the cooling fluid in the air gap channel 8, the integrated motor can be effectively prevented from being damaged.

[0065] In an embodiment of the present invention, the air gap channel 8 includes an inlet annular channel 801, a longitudinal annular channel 802 and an outlet annular channel 803 which are interconnected. The inlet annular channel 801 and the outlet annular channel 803 are maze-like channels, which can effectively block impurities in the fluid from entering the air gap channel 8, thereby ensuring the reliable operation of the integrated motor propulsion device.

[0066] 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. An integrated motor propulsion device with high efficiency cooling, characterized in that: include: Guide casing, impeller, integrated motor and heat exchanger; A support shaft coaxially arranged therewith is provided in the guide housing, and the impeller is rotatably connected to the support shaft; The integrated motor is embedded in the flow guide housing, and includes a rotor assembly and a stator assembly, and the rim of the impeller is connected to the rotor assembly; an air gap channel is formed between the stator assembly and the rotor assembly, and the air gap channel includes a longitudinal annular channel and an inlet annular channel and an outlet annular channel connected at two ends opposite to the longitudinal annular channel; The stator assembly includes a stator and a stator housing, the stator and the heat exchange element are both arranged in the stator housing, the heat exchange element has an evaporation section and a condensation section that are interconnected, the evaporation section is arranged close to the stator, and the condensation section is arranged close to the air gap channel; The heat exchange element comprises a plurality of heat exchange tubes, and the plurality of heat exchange tubes are circumferentially arranged in the stator housing around the axis of the flow guide housing; The heat exchange tube has a shape that matches the air gap channel, the evaporation section of the heat exchange tube is arranged close to the stator, and the condensation section of the heat exchange tube is arranged close to the inlet annular channel or the outlet annular channel; The heat exchange element comprises a first heat sink; The first vapor chamber is arranged in the stator housing in an annular direction around the axis of the guide housing, the evaporation section of the first vapor chamber is close to the side of the stator facing the rotor assembly, and the condensation section of the first vapor chamber is close to the longitudinal annular channel; The heat exchange element further includes a second heat sink; The second heat spreader is arranged in the stator shell in a circumferential direction around the axis of the flow guide shell, the evaporation section of the second heat spreader is close to the side of the stator away from the rotor assembly, and the condensation section of the second heat spreader is close to the outer wall of the flow guide shell.

2. The highly efficient cooling integrated motor propulsion device according to claim 1, characterized in that: The heat exchange tube comprises a straight section and two bent sections formed by bending opposite ends of the straight section; The straight section is arranged close to the stator; one of the two bent sections is arranged close to the inlet annular channel, and the other is arranged close to the outlet annular channel.

3. The highly efficient cooling integrated motor propulsion device according to claim 1, characterized in that: The first heat spreader is annular, and the outer wall surface of the first heat spreader is arranged in close contact with the inner wall surface of the stator.

4. The highly efficient cooling integrated motor propulsion device according to claim 1, characterized in that: The second heat spreader is annular, and the inner wall surface of the second heat spreader is arranged in close contact with the outer wall surface of the stator.

5. The highly efficient cooling integrated motor propulsion device according to claim 1, characterized in that: The outer wall surface of the flow guide housing is formed with a micro groove structure.

6. The highly efficient cooling integrated motor propulsion device according to any one of claims 1 to 5, characterized in that: The inlet annular channel is a labyrinth channel.

7. The highly efficient cooling integrated motor propulsion device according to claim 6, characterized in that: The outlet annular channel is a labyrinth channel.

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