CN115566858A

CN115566858A - Cooling device for nacelle propulsion motor and nacelle cooling system

Info

Publication number: CN115566858A
Application number: CN202211054861.9A
Authority: CN
Inventors: 陈防震; 马志刚; 侯志岩; 苏颖; 胡哲
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-01-03

Abstract

The utility model provides a cooling device and nacelle cooling system of nacelle propulsion motor belongs to nacelle cooling technical field. The cooling device includes: the heat exchanger and the air supply mechanism are both positioned in the circulating air pipe; the circulating air pipe is provided with a first end and a second end which are opposite to each other, the first end and the second end are communicated with an inner cavity of a shell used for installing a propulsion motor, the first end extends into the inner cavity of the shell and is opposite to the propulsion motor, and the heat exchanger and the air supply mechanism are sequentially arranged in the direction from the first end to the second end. The cooling device can cool the propulsion motor in a heat dissipation manner, and improves the working efficiency of the pod propeller.

Description

Cooling device for nacelle propulsion motor and nacelle cooling system

Technical Field

The disclosure relates to the technical field of pod cooling, in particular to a cooling device of a pod propulsion motor and a pod cooling system.

Background

The pod propeller is a ship propulsion device integrating propulsion and steering devices. A propulsion motor in a pod propulsion is usually arranged outside the cabin for driving the propeller in rotation for propulsion of the vessel.

Since the propulsion motor generates a lot of heat during operation, the propulsion motor needs to be cooled by a cooling device to prevent overheating from affecting the working efficiency of the nacelle propeller.

Disclosure of Invention

The embodiment of the disclosure provides a cooling device of a pod propulsion motor and a pod cooling system, which can dissipate heat and cool the propulsion motor and improve the working efficiency of a pod propeller. The technical scheme is as follows:

the disclosed embodiments provide a cooling device of a pod propulsion motor, the cooling device comprising: the heat exchanger and the air supply mechanism are positioned in the circulating air pipe; the circulating air pipe is provided with a first end and a second end which are opposite to each other, the first end and the second end are communicated with an inner cavity of a shell used for installing a propulsion motor, the first end extends into the inner cavity of the shell and is opposite to the propulsion motor, and the heat exchanger and the air supply mechanism are sequentially arranged in the direction from the first end to the second end.

In one implementation manner of the embodiment of the present disclosure, the air supply mechanism includes a first fan and a second fan, and the cooling device further includes: the device comprises a first temperature sensor, a second temperature sensor, a current detection piece and a controller, wherein the first temperature sensor is positioned in the first end and used for detecting a first temperature of the first end, the second temperature sensor is positioned in an inner cavity of the shell and used for detecting a second temperature in the shell, and the current detection piece is positioned in the inner cavity of the shell and used for detecting the working current of the propulsion motor; the first fan, the second fan, the first temperature sensor, the second temperature sensor and the current detection element are all electrically connected with the controller, and the controller is configured to control at most two of the first fan and the second fan to work based on the first temperature, the second temperature and the working current.

In another implementation manner of the embodiment of the present disclosure, the controller is configured to control the first fan to work when a first starting condition is met, where the first starting condition includes a starting instruction; the controller is configured to control the first fan to stop operating when all conditions in a first stop condition are met, the first stop condition including a stop instruction, the first temperature being less than a first threshold, and the second temperature being less than a second threshold.

In another implementation of an embodiment of the present disclosure, the first threshold is 40 ℃ to 50 ℃ and the second threshold is 75 ℃ to 85 ℃.

In another implementation manner of the embodiment of the present disclosure, the controller is configured to control the second fan to operate when one of second start conditions is met, where the second start condition includes that the first temperature is greater than a third threshold, the second temperature is greater than a fourth threshold, and the operating current is greater than a fifth threshold, the third threshold is higher than the first threshold, and the fourth threshold is higher than the second threshold; the controller is configured to control the second fan to stop operating when all of second stop conditions are met, the second stop conditions including a stop instruction, the first temperature being less than the first threshold, the second temperature being less than the second threshold, and the operating current being not greater than a fifth threshold.

In another implementation of the disclosed embodiment, the third threshold is 55 ℃ to 60 ℃, the fourth threshold is 100 ℃ to 110 ℃, and the fifth threshold is 50% of the rated current of the propulsion motor.

In another implementation manner of the embodiment of the present disclosure, the cooling device further includes an alarm, and the alarm is electrically connected to the controller; the controller is configured to control the alarm to give an alarm when an alarm condition is met, wherein the alarm condition comprises that the first temperature is greater than a sixth threshold value.

In another implementation manner of the embodiment of the present disclosure, the circulation duct further includes a delivery pipe, the delivery pipe is located in the inner cavity of the housing, one end of the delivery pipe is communicated with the second end, and the other end of the delivery pipe extends to the inner wall surface of the housing along a vertical downward direction.

In another implementation of the disclosed embodiment, the cooling device further includes an air filter located within the circulation duct and between the first end and the heat exchanger.

Embodiments of the present disclosure provide a pod cooling system comprising a cooling arrangement of a pod propulsion motor as described in the foregoing.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the cooling device of the pod propulsion motor comprises a circulating air pipe, a heat exchanger and an air supply mechanism, wherein a first end and a second end of the circulating air pipe are communicated with a shell provided with the propulsion motor, and the first end extends into an inner cavity of the shell and is opposite to the propulsion motor. Like this a large amount of hot-air that produce in the propulsion motor working process just can directly enter into the circulated air pipe through first end, and in the direction from first end to second end in the circulated air pipe, heat exchanger and air supply mechanism arrange in proper order, therefore, hot-air gets into and can take the lead to carry out heat exchange with the heat exchanger behind the circulated air pipe, thereby cool off the hot-air, obtain the cold air, and let the cold air after the cooling carry back to the inner chamber of shell from the second end in circulated air duct through air supply mechanism, in order to cool off the propulsion motor in the shell, continue to cool off the propulsion motor through circulation cooling's mode like this, can effectively cool off for the propulsion motor, in order to prevent overheated and influence the work efficiency of nacelle propeller.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural view of a cooling device of a pod propulsion motor provided by an embodiment of the present disclosure;

fig. 2 is a schematic structural view of another cooling device of a pod propulsion motor according to an embodiment of the present disclosure.

The various symbols in the figure are illustrated as follows:

10. a circulating air duct; 11. a first end; 12. a second end; 13. a delivery pipe; 14. a conical cover;

20. a heat exchanger;

31. a first fan; 32. a second fan;

40. a housing; 41. a propulsion motor;

51. a first temperature sensor; 52. a second temperature sensor; 53. an air filter.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like, as used in the description and in the claims of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a cooling device of a pod propulsion motor according to an embodiment of the present disclosure. As shown in fig. 1, the cooling device includes: the air conditioner comprises a circulating air pipe 10, a heat exchanger 20 and an air supply mechanism, wherein the heat exchanger 20 and the air supply mechanism are located in the circulating air pipe 10.

As shown in fig. 1, the circulating air duct 10 has a first end 11 and a second end 12 opposite to each other, the first end 11 and the second end 12 are both communicated with an inner cavity of a housing 40 for mounting a propulsion motor 41, the first end 11 extends into the inner cavity of the housing 40 and is opposite to the propulsion motor 41, and the heat exchanger 20 and the air supply mechanism are arranged in sequence from the first end 11 to the second end 12.

The cooling device of the nacelle propulsion motor provided by the embodiment of the disclosure comprises a circulating air pipe 10, a heat exchanger 20 and an air supply mechanism, wherein a first end 11 and a second end 12 of the circulating air pipe 10 are both communicated with a shell 40 provided with a propulsion motor 41, and the first end 11 extends into an inner cavity of the shell 40 and is opposite to the propulsion motor 41. Therefore, a large amount of hot air generated in the working process of the propulsion motor 41 can directly enter the circulating air pipe 10 through the first end 11, and in the direction from the first end 11 to the second end 12 in the circulating air pipe 10, the heat exchanger 20 and the air supply mechanism are sequentially arranged, so that the hot air enters the circulating air pipe 10 and then exchanges heat with the heat exchanger 20, the hot air is cooled to obtain cold air, the cooled cold air is conveyed back to the inner cavity of the shell 40 from the second end 12 of the circulating air duct through the air supply mechanism to cool the propulsion motor 41 in the shell 40, the propulsion motor 41 is cooled continuously in the circulating cooling mode, and the temperature of the propulsion motor 41 can be effectively reduced to prevent overheating from influencing the working efficiency of the pod propeller.

Alternatively, as shown in fig. 1, the air blowing mechanism includes a first fan 31 and a second fan 32.

Illustratively, the first fan 31 and the second fan 32 each include a fan blade and a motor, and an output shaft of the motor is connected to the fan blade to drive the fan blade to rotate.

As shown in fig. 1, the motors of the two fans are disposed outside the circulation duct 10 to prevent the motors from generating heat to affect the cool air in the circulation duct 10. The fan blades are arranged in the circulating air pipe 10. The circulating air duct 10 is provided with a through hole for the output shaft of the power supply to enter the circulating air duct 10 and be connected with the fan blades, so as to drive the fan blades to rotate.

In the disclosed embodiment, the fan is arranged to allow the cool air passing through the heat exchanger 20 to flow more rapidly to the second end 12 of the circulation duct 10.

The first fan 31 may be a main fan, and the second fan 32 may be a standby fan. The first fan 31 works together with the propulsion motor 41 to continuously supply cool air to the propulsion motor 41 to cool down the propulsion motor 41. When the load of the propulsion motor 41 is large and the generated heat is large, the second fan 32 can be controlled to work, that is, the first fan 31 and the second fan 32 are used together to convey cold air to the housing 40, so that the air can be circulated and conveyed in the air circulation pipe 10 more quickly, and the cooling and heat dissipation effects of the propulsion motor 41 can be improved.

As shown in fig. 1, the cooling apparatus further includes: a first temperature sensor 51, a second temperature sensor 52, a current detecting member, and a controller.

The first temperature sensor 51 is located in the first end 11, and the first temperature sensor 51 is configured to detect a first temperature of the first end 11. The first temperature sensor 51 is disposed at the first end 11 and can detect a first temperature of the hot air flowing into the circulation duct 10 from the housing 40, and the first temperature of the hot air at the first end 11 determines an operation intensity of the heat exchanger 20, so that the operation intensity of the heat exchanger 20 can be determined by the first temperature, and whether to activate the first fan 31 or the second fan 32 to assist the heat exchanger 20 in dissipating heat can be determined by the first temperature, thereby reducing the operation intensity of the heat exchanger 20.

A second temperature sensor 52 is located in the interior cavity of the housing 40, the second temperature sensor 52 being for sensing a second temperature within the housing 40. A second temperature sensor 52 is disposed in the interior of the housing 40 and is configured to sense the ambient temperature of the propulsion motor 41, such that the ambient temperature in the interior of the housing 40 can be determined from the first temperature to facilitate determining the current heat generation within the housing 40. Whether to start the first fan 31 or the second fan 32 is determined by the second temperature, so as to improve the cooling and heat dissipation effects of the propulsion motor 41.

Illustratively, the first temperature sensor 51 and the second temperature sensor 52 may each be a thermocouple sensor,

wherein, the current detection piece is located in the inner cavity of the housing 40, and the current detection piece is used for detecting the working current of the propulsion motor 41.

The working current of the propulsion motor 41 can be detected through the current detection piece, if the working current is larger, the load of the propulsion motor 41 is larger at the moment, the cooling and heat dissipation effects of the cooling device can be enhanced at the moment, and the propulsion motor 41 is protected; if the working current is small, the load of the propulsion motor 41 is small, and the cooling and heat dissipation effects of the cooling device can be reduced, so that the energy consumption is reduced.

For example, the current detecting member may be an ammeter connected to an operating circuit of the propulsion motor 41 for detecting an operating current of the propulsion motor 41.

The first fan 31, the second fan 32, the first temperature sensor 51, the second temperature sensor 52 and the current detection element are all electrically connected to the controller. Thus, the controller can acquire the first temperature detected by the first temperature sensor 51, acquire the second temperature detected by the second temperature sensor 52, and acquire the operating current detected by the current detecting element.

After acquiring the first temperature, the second temperature and the working current, the controller may determine the working strength of the propulsion motor 41 in the current state according to the temperature and the current, and then control at most two of the first fan 31 and the second fan 32 to work based on the first temperature, the second temperature and the working current.

For example, when the working intensity of the propulsion motor 41 is large, two fans can be controlled to work together; when the operation intensity of the propulsion motor 41 is small, only the first fan 31 may be controlled to operate.

For example, the Controller may be a Programmable Logic Controller (PLC), which is a digital operation Controller with a microprocessor and used for automation control, and the PLC may load a control instruction into a memory at any time for storage and execution.

Optionally, the controller is configured to control the first fan 31 to operate when a first start condition is met, where the first start condition includes a start instruction.

The starting instruction may be an instruction manually input to the controller by a technician, and the instruction is used for instructing the controller to control the first fan 31 to start working.

Illustratively, the cooling device further comprises a mechanical switch electrically connected to the controller, and when the technician toggles a button of the mechanical switch, the controller acquires an on-off signal of the mechanical switch and controls the first fan 31 to start working based on the on-off signal.

Alternatively, the controller is configured to control the first fan 31 to stop operating when all of the first stop conditions are satisfied.

Wherein the first stop condition comprises a stop instruction, the first temperature is less than a first threshold, and the second temperature is less than a second threshold.

The stop command may be a command manually input to the controller by a technician, and the command is used for instructing the controller to control the first fan 31 to stop working.

Illustratively, the cooling device further includes a mechanical switch, and the mechanical switch is electrically connected to the controller, and when a technician dials a button of the mechanical switch, the controller obtains an on-off signal of the mechanical switch, and controls the first fan 31 to stop working based on the on-off signal.

Wherein the first temperature is a temperature of the hot air flowing into the circulation duct 10 from the casing 40. The first temperature determines the operating strength of the heat exchanger 20. When the first temperature is lower than the first threshold, it indicates that the temperature of the hot air in the circulating air duct 10 is lower, and the cooling heat dissipation effect of the cooling device is better.

The second temperature is the ambient temperature of the propulsion motor 41, which may determine the current heat generation conditions within the housing 40. When the second temperature is lower than the second threshold, it indicates that the working environment of the propulsion motor 41 is suitable at this time, and the cooling effect of the cooling device is good.

Therefore, when the controller detects that the above three conditions are satisfied, the first fan 31 is controlled to stop working, so as to save energy consumption. Moreover, even if the technician manually inputs the stop command, the first temperature and the second temperature need to be further detected to assist in determining the current cooling and heat dissipation condition of the propulsion motor 41, so as to ensure safety.

Illustratively, the first threshold is 40 ℃ to 50 ℃, for example, the first threshold may be 45 ℃. When the first temperature is lower than 45 ℃, it indicates that the temperature of the hot air in the circulating air duct 10 is lower, and the cooling effect of the cooling device is better.

Illustratively, the second threshold is 75 ℃ to 85 ℃, for example, the second threshold may be 80 ℃. When the second temperature is lower than 80 ℃, it indicates that the working environment of the propulsion motor 41 is suitable at this time, and the cooling effect of the cooling device is good.

Optionally, the controller is configured to control the second fan 32 to operate when one of the second start conditions is met.

The second starting condition comprises that the first temperature is greater than a third threshold, the second temperature is greater than a fourth threshold and the working current is greater than a fifth threshold, the third threshold is higher than the first threshold, and the fourth threshold is higher than the second threshold.

The first temperature is the temperature of the hot air flowing from the housing 40 into the circulating duct 10. The first temperature determines the operating strength of the heat exchanger 20. When the first temperature is higher than the third threshold, it indicates that the temperature of the hot air in the circulating air duct 10 is higher, and the cooling heat dissipation effect of the cooling device is not good.

The second temperature is the ambient temperature of the propulsion motor 41, which may determine the current heat generation conditions within the housing 40. When the second temperature is higher than the fourth threshold, it indicates that the ambient temperature of the propulsion motor 41 is higher, and the cooling heat dissipation effect of the cooling device is not good.

The working current is a current when the propulsion motor 41 works, and if the working current exceeds a fifth threshold, it indicates that the load of the propulsion motor 41 is large at this time, and the cooling effect of the cooling device is not good.

Therefore, when the controller detects any one of the three conditions, the second fan 32 can be controlled to start working, and the heat dissipation effect of the cooling device is improved.

Illustratively, the third threshold is 55 ℃ to 60 ℃, e.g., the third threshold may be 55 ℃. When the first temperature is more than 55 ℃, which indicates that the temperature of the hot air in the circulation duct 10 is high, the heat exchanger 20 needs to work with higher intensity, and thus the second fan 32 needs to be controlled to work secondarily.

Illustratively, the fourth threshold is 100 ℃ to 110 ℃, for example, the fourth threshold may be 105 ℃. When the fourth temperature is higher than 105 ℃, it indicates that the working environment of the propulsion motor 41 is higher, and the cooling effect of the cooling device is not good, so that the second fan 32 needs to be controlled to enhance the heat dissipation.

Illustratively, the fifth threshold is 50% of the rated current of the propulsion motor 41. If the operating current exceeds 50% of the rated current of the propulsion motor 41, which indicates that the load of the propulsion motor 41 is large at this time, the second fan 32 needs to be controlled to enhance heat dissipation.

Optionally, the controller is configured to control the second fan 32 to stop when all of the second stop conditions are met.

Wherein the second stop condition includes a stop instruction, the first temperature is less than the first threshold, the second temperature is less than the second threshold, and the operating current is not greater than the fifth threshold.

Illustratively, the cooling device further includes a mechanical switch, the mechanical switch is electrically connected to the controller, and when a technician dials a button of the mechanical switch, the controller obtains an on-off signal of the mechanical switch and controls the first fan 31 to stop working based on the on-off signal.

Wherein the first temperature determines the operating strength of the heat exchanger 20. When the first temperature is lower than the first threshold, it indicates that the temperature of the hot air in the circulating air duct 10 is lower, and the cooling heat dissipation effect of the cooling device is better.

Illustratively, the first threshold is 40 ℃ to 50 ℃, for example, the first threshold may be 45 ℃.

The second temperature is the ambient temperature of the propulsion motor 41, which may determine the current heat generation within the housing 40. When the second temperature is lower than the second threshold, it indicates that the working environment of the propulsion motor 41 is suitable at this time, and the cooling effect of the cooling device is good.

Illustratively, the second threshold is 75 ℃ to 85 ℃, e.g., the second threshold may be 80 ℃.

The working current is the current when the propulsion motor 41 works, and if the working current is lower than the fifth threshold, it indicates that the propulsion motor 41 works at a low load, and the cooling effect of the cooling device is good.

Illustratively, the fifth threshold is 50% of the rated current of the propulsion motor 41.

In the embodiment of the present disclosure, when the controller detects that the above four conditions are satisfied, the second fan 32 is controlled to stop working, so as to prevent the second fan 32 from stopping working easily, and ensure the heat dissipation effect of the propulsion motor 41. Moreover, even if the technician manually inputs the stop command, the first temperature and the second temperature need to be further detected to assist in determining the current cooling and heat dissipation condition of the propulsion motor 41, so as to ensure safety.

Optionally, as shown in fig. 1, the cooling device further includes an alarm, and the alarm is electrically connected to the controller; the controller is configured to control the alarm to issue an alarm when the alarm condition is satisfied.

Wherein the alarm condition includes the first temperature being greater than a sixth threshold. The sixth threshold may be more than 65 ℃, the sixth threshold may be 70 ℃, and when the first temperature, that is, the temperature of the hot air entering the circulating air pipe 10, reaches more than 70 ℃, it indicates that the temperature in the housing 40 is too high, and the heat dissipation capacity of the cooling device is not enough to meet the heat dissipation requirement of the propulsion motor 41, so that when the first temperature is obtained by the controller to exceed the sixth threshold, the controller may control the alarm to send out an alarm to remind a technician to overhaul in time.

Optionally, the alarm condition may also include the temperature of the cold air at second end 12 being greater than 45 ℃. When the air cooled by the circulating air pipe 10 is to be conveyed to the shell 40 and the temperature of the cold air reaches above 45 ℃, it indicates that the cooling device has a heat dissipation fault, and the controller needs to control an alarm to give an alarm to remind a technician to overhaul in time.

Optionally, the alarm condition may also include the humidity of the air in the circulating duct 10 exceeding 90%. When the air humidity exceeds 90%, the controller needs to control an alarm to give an alarm so as to remind technicians to overhaul in time.

For example, the air humidity may be detected by an air humidity sensor provided in the circulation duct 10.

In the embodiment of the present disclosure, the heat exchanger 20 is a water-cooled heat exchanger 20. The bottom of the heat exchanger 20 can also be provided with a liquid level sensor, whether the heat exchanger 20 has liquid leakage or not is detected through the liquid level sensor, if the liquid level is detected to be higher, the liquid leakage is serious, and the heat exchanger 20 can not cool and dissipate the hot air easily.

Thus, the alarm condition may also include the detected level of the level sensor exceeding a set level. When the detection liquid level of the liquid level sensor exceeds the set liquid level, the controller needs to control alarm to give an alarm so as to remind technicians to overhaul in time.

Illustratively, the number of the heat exchangers 20 can be two, and the two heat exchangers 20 can improve the heat exchange effect.

Optionally, the alarm condition may also include the air pressure within the recirculation duct 10 exceeding a set pressure. When the air pressure exceeds the set pressure, the controller needs to control the alarm to give an alarm so as to remind technicians to overhaul in time.

For example, the air pressure may be detected by a pressure gauge provided on the circulation duct 10.

Optionally, as shown in fig. 1, the cooling device further comprises an air filter 53, the air filter 53 is located in the circulation duct 10, and the air filter 53 is located between the first end 11 and the heat exchanger 20. The air filter 53 is arranged to filter the air entering the circulating air duct 10, so as to prevent impurities in the air from entering the circulating air duct 10, and to provide clean cold air for the propulsion motor 41.

Fig. 2 is a schematic structural diagram of another cooling device for a pod propulsion motor according to an embodiment of the present disclosure. As shown in fig. 2, the circulation duct 10 further includes a duct 13, the duct 13 is located in the inner cavity of the housing 40, one end of the duct 13 communicates with the second end 12, and the other end of the duct 13 extends in a vertically downward direction to an inner wall surface of the housing 40.

Since the hot air in the casing 40 is easily diffused upward, in order to prevent the hot air from reversely flowing into the circulating air duct 10 through the second end 12, the other end of the conveying pipe 13 is extended to the inner wall surface of the casing 40 in a vertically upward direction to prevent the hot air from easily flowing into the circulating air duct 10 through the second end 12 during the diffusion process.

Illustratively, the other end of the delivery pipe 13 has a gap with the inner wall surface of the housing 40, and the length of the gap may be 5mm to 10mm. This ensures that there is a small gap between the end of the duct 13 and the housing 40, preventing hot air from entering the duct 13.

Alternatively, as shown in fig. 2, a conical cover 14 is provided in the delivery pipe 13, a large end of the conical cover 14 is connected to an inner wall surface of the delivery pipe 13, a small end of the conical cover 14 has an opening for air to flow through, and a distance from the small end of the conical cover 14 to the other end of the delivery pipe 13 is smaller than a distance from the large end of the conical cover 14 to the other end of the delivery pipe 13.

The tapered cap 14 is thus provided in the duct 13 to inhibit air in the housing 40 from entering the circulation duct, further preventing hot air from easily entering the circulation duct 10 through the second end 12 during diffusion.

Embodiments of the present disclosure provide a pod cooling system comprising a cooling arrangement of a pod propulsion motor as described above.

Although the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure.

Claims

1. A cooling arrangement of a pod propulsion motor, characterized in that the cooling arrangement comprises: the air conditioner comprises a circulating air pipe (10), a heat exchanger (20) and an air supply mechanism, wherein the heat exchanger (20) and the air supply mechanism are both positioned in the circulating air pipe (10);

the circulating air pipe (10) is provided with a first end (11) and a second end (12) which are opposite to each other, the first end (11) and the second end (12) are communicated with an inner cavity of a shell (40) used for installing a propulsion motor (41), the first end (11) extends into the inner cavity of the shell (40) and is opposite to the propulsion motor (41), and the heat exchanger (20) and the air supply mechanism are sequentially arranged in the direction from the first end (11) to the second end (12).

2. The cooling apparatus according to claim 1, wherein the air blowing mechanism includes a first fan (31) and a second fan (32), the cooling apparatus further comprising: a first temperature sensor (51), a second temperature sensor (52), a current detector and a controller, wherein the first temperature sensor (51) is positioned in the first end (11) and is used for detecting a first temperature of the first end (11), the second temperature sensor (52) is positioned in the inner cavity of the shell (40) and is used for detecting a second temperature in the shell (40), and the current detector is positioned in the inner cavity of the shell (40) and is used for detecting the working current of the propulsion motor (41);

the first fan (31), the second fan (32), the first temperature sensor (51), the second temperature sensor (52), and the current detector are all electrically connected to the controller, and the controller is configured to control at most two of the first fan (31) and the second fan (32) to operate based on the first temperature, the second temperature, and the operating current.

3. A cooling arrangement according to claim 2, wherein the controller is configured to control the operation of the first fan (31) when a first start-up condition is met, the first start-up condition comprising a start-up instruction;

the controller is configured to control the first fan (31) to stop working when all of first stop conditions are met, the first stop conditions including a stop instruction, the first temperature being less than a first threshold, and the second temperature being less than a second threshold.

4. A cooling device according to claim 3, characterised in that the first threshold value is 40 ℃ to 50 ℃ and the second threshold value is 75 ℃ to 85 ℃.

5. A cooling arrangement according to claim 3, wherein the controller is configured to control the second fan (32) to operate when one of second activation conditions is met, the second activation conditions including the first temperature being greater than a third threshold value, the second temperature being greater than a fourth threshold value and the operating current being greater than a fifth threshold value, the third threshold value being higher than the first threshold value, the fourth threshold value being higher than the second threshold value;

the controller is configured to control the second fan (32) to stop operating when all of second stop conditions are met, the second stop conditions including a stop command, the first temperature being less than the first threshold, the second temperature being less than the second threshold, and the operating current being not greater than a fifth threshold.

6. Cooling arrangement according to claim 5, characterized in that the third threshold value is 55-60 ℃, the fourth threshold value is 100-110 ℃ and the fifth threshold value is 50% of the rated current of the propulsion motor (41).

7. The cooling device of claim 2, further comprising an alarm, wherein the alarm is electrically connected to the controller;

the controller is configured to control the alarm to give an alarm when an alarm condition is met, wherein the alarm condition comprises that the first temperature is larger than a sixth threshold value.

8. The cooling device according to any one of claims 1 to 7, wherein the circulation duct (10) further comprises a duct (13), the duct (13) being located in the inner cavity of the housing (40), one end of the duct (13) communicating with the second end (12), the other end of the duct (13) extending in a vertically downward direction to an inner wall surface of the housing (40).

9. A cooling arrangement according to any one of claims 1-7, characterised in that the cooling arrangement further comprises an air filter (53), which air filter (53) is located in the circulation duct (10) between the first end (11) and the heat exchanger (20).

10. A pod cooling system, characterized in that it comprises a cooling device of a pod propulsion motor according to any of claims 1 to 9.