CN111711322A - Double-hub motor and intelligent cooling system and control method of controller thereof - Google Patents
Double-hub motor and intelligent cooling system and control method of controller thereof Download PDFInfo
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- CN111711322A CN111711322A CN202010449886.3A CN202010449886A CN111711322A CN 111711322 A CN111711322 A CN 111711322A CN 202010449886 A CN202010449886 A CN 202010449886A CN 111711322 A CN111711322 A CN 111711322A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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Abstract
The invention provides a double-hub motor and an intelligent cooling system and a control method of a controller thereof, wherein the double-hub motor comprises a double-hub motor, a double-motor controller, a double-layer cooling liquid tank and an electric control unit; the upper layer of the double-layer cooling liquid tank is provided with a liquid level sensor which is used for acquiring real-time liquid level and controlling the liquid pumping speed of the variable-speed electric liquid pump; a first temperature sensor is arranged in the double-hub motor and used for acquiring the real-time temperature in the motor and controlling the liquid pumping speed of the cooling liquid pump; a second temperature sensor is arranged in the double-motor controller and used for acquiring the real-time temperature in the controller, controlling the liquid pumping speed of the cooling liquid pump and adjusting the opening of the electric control ball valve; and a third temperature sensor is arranged on the lower layer of the double-layer cooling liquid tank and used for acquiring the real-time temperature of the cooling liquid on the lower layer and controlling the rotating speed of the fan blades. The invention can effectively cool the double-hub motor and the double-motor controller on one hand, and can carry out necessary forced heat dissipation on the cooling liquid in the cooling liquid tank on the other hand, thereby ensuring the most effective heat dissipation effect.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and particularly relates to a double-hub motor and an intelligent cooling system and a control method of a controller of the double-hub motor.
Background
With the rapid consumption of non-renewable energy, the development of electric vehicles is particularly important, and especially when the electric vehicles are applied to public transportation, the discharge of a large amount of pollutants is reduced every day, and the electric vehicles are tiled for gaining the guard war in blue. Although electric vehicles are receiving much attention, there are many problems, which are the heat dissipation problem of the driving motor on the vehicle. A driving motor on a vehicle integrates a plurality of parts, and each part can generate a large amount of heat during operation; the current users have higher requirements on the performance of the vehicles, so that the heat generated by large-scale enterprises is greatly improved due to the fact that the large number of the enterprises use the high-power-density motor; if the driving motor fails due to the fact that heat is not effectively dissipated, the insulativity of internal parts such as winding coils is damaged, permanent demagnetization can happen to the permanent magnet, and the service life of the motor is greatly influenced. In addition to more heat productivity of the motor, the heat productivity of a controller for driving the motor needs to be effectively controlled, otherwise, the motor controller is easy to burn out due to heat and lose control capability; the motor controller on the traditional electric vehicle is only provided with a heat dissipation strip on the surface for natural air cooling heat dissipation, but along with the improvement of the power of a vehicle driving motor, the power of the controller is also increased, and meanwhile, along with the increase of heat productivity, the heat dissipation problem is very important.
At present, the heat dissipation treatment of the electric vehicle to the controller of the driving motor is simpler, the performance of the whole vehicle is low, and the electric vehicle cannot run for a long time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the intelligent cooling system and the intelligent cooling method for the double-hub motor and the controller thereof, which can not only carry out efficient cooling on the double-hub motor and the double-motor controller, but also carry out necessary forced heat dissipation on the cooling liquid in the cooling liquid tank, thereby ensuring the most effective heat dissipation effect.
The present invention achieves the above-described object by the following technical means.
An intelligent cooling system of a double-hub motor and a controller thereof comprises the double-hub motor, a double-motor controller and a double-layer cooling liquid tank;
the upper layer and the lower layer of the double-layer cooling liquid tank are connected with a variable-speed electric liquid pump, a liquid level sensor is arranged on the upper layer of the double-layer cooling liquid tank, a third temperature sensor is arranged at a liquid outlet of the lower layer of the double-layer cooling liquid tank, and fan blades are further arranged on the lower layer of the double-layer cooling liquid tank;
a cooling liquid pump is arranged between the double-motor controller and the double-layer cooling liquid tank, a liquid inlet of the cooling liquid pump is communicated with the upper layer of the double-layer cooling liquid tank, a liquid outlet of the cooling liquid pump is divided into two paths, one path is connected with a liquid inlet of a cooling pipeline in the double-motor controller through a pipeline, and the other path is connected with a liquid inlet of a cooling pipeline in the double-hub motor through a pipeline; an electric control ball valve is arranged on a liquid inlet pipeline of the dual-motor controller; a liquid outlet of the internal cooling pipeline of the double-motor controller and a liquid outlet of the internal cooling pipeline of the double-hub motor are respectively connected to the lower layer of the double-layer cooling liquid tank through pipelines;
a first temperature sensor is arranged in the double-hub motor, and a second temperature sensor is arranged in a cooling pipeline in the double-motor controller;
the variable-speed electric liquid pump, the cooling liquid pump, the fan blades, the electric control ball valve, the liquid level sensor, the first temperature sensor, the second temperature sensor and the third temperature sensor are all in signal connection with the electric control unit.
In the technical scheme, the cooling pipeline in the double-motor controller is arranged on the lower cover plate of the controller.
In the above technical scheme, the cooling pipeline inside the dual-motor controller is a symmetrical continuous U-shaped pipe.
In the above technical scheme, the fan blades are internally provided with the driving motors.
In the technical scheme, the liquid inlet and the liquid outlet of the cooling pipeline inside the double-hub motor are arranged on the same plane.
A control method of an intelligent cooling system of a double-hub motor and a controller thereof specifically comprises the following steps:
the cooling liquid pump runs, the liquid level sensor acquires the real-time liquid level of the upper layer of the double-layer cooling liquid tank, and the electric control unit controls the liquid pumping speed of the variable-speed electric liquid pump according to the liquid level condition of the upper layer of the double-layer cooling liquid tank, so that the upper layer liquid capacity of the double-layer cooling liquid tank is kept constant;
the method comprises the steps that a first temperature sensor obtains the real-time temperature inside a double-hub motor, and an electric control unit controls the liquid pumping speed of a cooling liquid pump according to the real-time temperature inside the double-hub motor, so that the internal temperatures of the two motors are maintained at a threshold value A;
the second temperature sensor acquires the real-time temperature inside the dual-motor controller, and the electric control unit controls the liquid pumping speed of the cooling liquid pump and adjusts the opening of the electric control ball valve according to the real-time temperature inside the dual-motor controller, so that the internal temperature of the dual-motor controller is maintained at a threshold value B;
the third temperature sensor obtains the real-time temperature of the lower layer cooling liquid of the double-layer cooling liquid tank, and the electric control unit controls the rotating speed of the fan blade driving motor according to the real-time temperature of the lower layer cooling liquid, so that the real-time temperature of the cooling liquid is maintained at the threshold value C.
Further, the controlling the pump speed of the variable speed electric liquid pump specifically comprises: the real-time liquid level is lower than the liquid level threshold value, and the electric control unit controls the speed of the variable-speed electric liquid pump to increase; the real-time liquid level is higher than the liquid level threshold value, and the electric control unit controls the speed of the pump liquid of the variable-speed electric liquid pump to be reduced.
Further, the controlling of the pump liquid speed of the cooling liquid pump specifically includes: when the real-time temperature in the double-hub motor is lower than a temperature threshold A, the electric control unit controls the liquid pumping speed of the cooling liquid pump to be reduced; when the real-time temperature in the double-hub motor is higher than the temperature threshold A, the electric control unit controls the liquid pumping speed of the cooling liquid pump to be increased.
Further, the controlling of the pump liquid speed of the cooling liquid pump and the adjusting of the opening of the electric control ball valve specifically include: if the real-time temperature of the double-motor controller is higher than the threshold value B and the real-time temperature of the double-hub motor is not higher than the threshold value A, the opening degree of the electric control ball valve is increased, and if the real-time temperature of the double-motor controller is not reduced remarkably, the rotating speed of the cooling liquid pump is increased; if the real-time temperature of the double-motor controller is higher than the threshold B and the real-time temperature of the double-hub motor is also higher than the threshold A, the rotating speed of the cooling liquid pump is increased, and meanwhile, the opening degree of the electric control ball valve is increased.
Further, the control flabellum driving motor's rotational speed specifically is: when the real-time temperature of the lower-layer cooling liquid is lower than a temperature threshold value C, the electric control unit controls the rotating speed of the fan blade driving motor to be reduced; when the real-time temperature of the lower-layer cooling liquid is higher than the temperature threshold value C, the electric control unit controls the rotating speed of the fan blade driving motor to increase.
The invention has the beneficial effects that:
(1) the cooling liquid box is of a double-layer structure, the temperature of the cooling liquid at the lower layer is effectively reduced after the cooling liquid is subjected to forced heat dissipation by the fan blades, so that the initial temperature of the cooling liquid entering the double-hub motor and the double-motor controller is lower, and the heat in the double-hub motor and the double-motor controller can be effectively taken away;
(2) according to the invention, the circulation pipeline is arranged in the double-motor controller, and the modules in the double-motor controller are forcibly cooled, so that the damage caused by long-time operation is avoided;
(3) the electric control ball valve is arranged on the liquid inlet pipeline of the double-motor controller, and the opening degree is effectively adjusted according to the internal temperature of the double-motor controller and the rotating speed of the cooling liquid pump, so that the most effective cooling is carried out;
(4) the double-motor controller and the double-hub motor are cooled most effectively at the same time, and both run at the optimal temperature all the time, so that the performance can be released most effectively.
Drawings
FIG. 1 is a schematic diagram of the intelligent cooling system of the present invention;
FIG. 2 is an exploded view of the dual motor controller of the present invention;
FIG. 3 is a diagram of the internal cooling circuit of the dual motor controller according to the present invention;
description of reference numerals: 1-double hub motor; 2-a liquid inlet cooling pipeline of the double-hub motor; 3-a variable speed electric liquid pump; 4-a coolant pump; 5-an electric control ball valve; 6-double motor controller; 7-fan blades; 8-a first temperature sensor; 9-a liquid outlet pipeline of the double-motor controller; 10-double-layer cooling liquid tank; 11-a liquid inlet pipeline of the double-motor controller; 12-a liquid inlet pipeline of a cooling liquid pump; 13-an electronic control unit; 14-a liquid level sensor; 15-a double-hub motor liquid outlet pipeline; 16-a second temperature sensor; 17-third temperature sensor.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1, an intelligent cooling system for a dual-hub motor and a controller thereof is arranged on a vehicle rack, and specifically comprises a dual-hub motor 1, a dual-hub motor liquid inlet cooling pipeline 2, a variable-speed electric liquid pump 3, a cooling liquid pump 4, an electric control ball valve 5, a dual-motor controller 6, fan blades 7, a first temperature sensor 8, a dual-motor controller liquid outlet pipeline 9, a dual-layer cooling liquid tank 10, a dual-motor controller liquid inlet pipeline 11, a cooling liquid inlet pipeline 12, an electric control unit 13, a liquid level sensor 14, a dual-hub motor liquid outlet pipeline 15, a second temperature sensor 16 and a third temperature sensor 17.
The double-deck coolant liquid case 10 is equipped with two-layerly, and the centre separates with the baffle, and the liquid outlet of lower floor passes through the inlet of tube coupling to the electronic liquid pump 3 of variable speed, and the liquid outlet of the electronic liquid pump 3 of variable speed passes through the tube coupling and is connected with the inlet on double-deck coolant liquid case 10 upper strata. The variable speed electric liquid pump 3 is connected with the lower layer and the upper layer of the double-layer cooling liquid tank 10 through pipelines, and transmits the cooling liquid of the lower layer to the upper layer through forced heat dissipation. A third temperature sensor 17 is arranged at the liquid outlet of the lower layer of the double-layer cooling liquid tank 10. The upper layer of the double-layer cooling liquid tank 10 is provided with a liquid level sensor 14, the lower layer of the double-layer cooling liquid tank 10 is provided with a fan blade 7, and the fan blade 7 is internally provided with a driving motor. The double-layer cooling liquid tank 10 is sealed as a whole except for a liquid inlet and a liquid outlet which are arranged on the outer surface.
The inlet of coolant pump 4 passes through coolant pump inlet line 12 and is connected with 10 upper liquid outlets of double-deck coolant liquid case, and 4 liquid outlets of coolant pump divide into two pipelines, and the first is: the liquid inlet pipeline 11 of the double-motor controller is connected with the liquid inlet of the electric control ball valve 5, the liquid outlet of the electric control ball valve 5 is connected with the liquid inlet of the cooling pipeline in the double-motor controller 6 through the double-motor controller pipeline 11, and the electric control ball valve 5 is used for controlling the flow of cooling liquid to the pipeline in the double-motor controller 6 so as to achieve the optimal cooling effect; the second one is: the double-hub motor 1 is cooled through the connection of the double-hub motor liquid inlet cooling pipeline 2 and the liquid inlet of the double-hub motor 1 internal cooling pipeline. The liquid inlet and the liquid outlet of the cooling pipeline in the double-hub motor 1 are arranged on the same plane. A liquid outlet of a cooling pipeline inside the double-motor controller 6 is connected to a lower-layer liquid inlet of the double-layer cooling liquid tank 10 through a double-hub motor liquid outlet pipeline 15, and a second temperature sensor 16 is arranged in the cooling pipeline inside the double-motor controller 6; the liquid outlet of the internal cooling pipeline of the double-hub motor 1 is connected to the lower-layer liquid inlet of the double-layer cooling liquid tank 10 through the double-motor controller liquid outlet pipeline 9, and a first temperature sensor 8 is arranged inside the double-hub motor 1.
As shown in fig. 2, the internal cooling pipe of the dual motor controller 6 is provided on the controller lower cover plate. As shown in fig. 3, the cooling pipeline inside the dual-motor controller 6 is a symmetrical continuous U-shaped pipe.
The variable-speed electric liquid pump 3, the cooling liquid pump 4, the driving motor of the fan blades 7, the electric control ball valve 5, the liquid level sensor 14, the first temperature sensor 8, the second temperature sensor 16 and the third temperature sensor 17 are in signal connection with the electric control unit 13.
A control method of an intelligent cooling system of a double-hub motor and a controller thereof specifically comprises the following steps:
automatically controlled unit 13 control coolant pump 4 is in the running state, and level sensor 14 acquires the real-time liquid level in double-deck coolant liquid case 10 upper strata to give automatically controlled unit 13, set up double-deck coolant liquid case 10 upper strata liquid level threshold value in the automatically controlled unit 13, and automatically controlled unit 13 is according to the liquid level condition on double-deck coolant liquid case 10 upper strata, and the pump liquid speed of control variable speed electric liquid pump 3 specifically does: when the real-time liquid level is lower than the liquid level threshold value, the electric control unit 13 controls the speed of the variable-speed electric liquid pump 3 to increase; the real-time liquid level is higher than the liquid level threshold value, and the electric control unit 13 controls the speed of the variable-speed electric liquid pump 3 to be reduced; thereby keeping the upper liquid capacity of the double-layer cooling liquid tank 10 constant and ensuring the sufficient flow of the whole circulating liquid.
Acquire the inside real-time temperature of two in-wheel motor 1 through first temperature sensor 8, transmit for electrical unit 13, set up the inside temperature threshold value A of two in-wheel motor in electrical unit 13, electrical unit 13 is according to the inside real-time temperature of two in-wheel motor 1, and the pump liquid speed of control coolant pump 4 specifically does: when the real-time temperature in the double-hub motor 1 is lower than the temperature threshold A, the electric control unit 13 controls the pump liquid speed of the cooling liquid pump 4 to be reduced; when the real-time temperature in the double-hub motor 1 is higher than the temperature threshold A, the electric control unit 13 controls the liquid pumping speed of the cooling liquid pump 4 to be increased; carry out more powerful heat dissipation to the motor, guarantee the high efficiency operation of motor for two inside temperatures of motor all keep in the best department.
Obtain the inside real-time temperature of bi-motor controller 6 through second temperature sensor 16, transmit for electrical unit 13, set up the inside temperature threshold value B of two in-wheel motor in electrical unit 13, electrical unit 13 is according to the inside real-time temperature of bi-motor controller 6, and the pump liquid speed of control coolant pump 4 and the aperture of adjusting automatically controlled ball valve 5 specifically do: when the real-time temperature in the dual-motor controller 6 is lower than the temperature threshold B, the electric control unit 13 controls the opening of the electric control ball valve 5 to be reduced; when the real-time temperature in the dual-motor controller 6 is higher than the temperature threshold B, the electronic control unit 13 controls the pump speed of the coolant pump 4 to be increased on the one hand, and adjusts the opening degree of the electronic control ball valve 5 on the other hand, specifically: if the real-time temperature of the dual-motor controller 6 is higher than the threshold value B and the real-time temperature of the dual-hub motor 1 is not higher than the threshold value A, the opening degree of the electric control ball valve 5 is increased, and if the real-time temperature of the dual-motor controller 6 is not remarkably reduced, the rotating speed of the cooling liquid pump 4 is increased; if the real-time temperature of the double-motor controller 6 is higher than the threshold B and the real-time temperature of the double-hub motor 1 is also higher than the threshold A, the rotating speed of the cooling liquid pump 4 is increased, and meanwhile, the opening degree of the electric control ball valve 5 is increased.
Acquire the real-time temperature of double-deck coolant liquid case 10 lower floor's coolant liquid through third temperature sensor 17, transmit for electrical unit 13, set up the temperature threshold value C of lower floor's coolant liquid in electrical unit 13, electrical unit 13 is according to the real-time temperature of lower floor's coolant liquid, and control flabellum 7 driving motor's rotational speed specifically does: when the real-time temperature of the lower-layer cooling liquid is lower than the temperature threshold C, the electric control unit 13 controls the fan blades 7 to drive the motor to rotate at a reduced speed; when the real-time temperature of the lower-layer cooling liquid is higher than the temperature threshold value C, the electric control unit 13 controls the fan blades 7 to drive the motor to rotate at an increased speed.
In the control method, the temperature threshold C is more than the temperature threshold B is more than the temperature threshold A.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. An intelligent cooling system of a double-hub motor and a controller thereof is characterized by comprising a double-hub motor (1), a double-motor controller (6) and a double-layer cooling liquid tank (10);
the upper layer and the lower layer of the double-layer cooling liquid tank (10) are connected with a variable-speed electric liquid pump (3), the upper layer of the double-layer cooling liquid tank (10) is provided with a liquid level sensor (14), the liquid outlet of the lower layer of the double-layer cooling liquid tank (10) is provided with a third temperature sensor (17), and the lower layer of the double-layer cooling liquid tank (10) is also provided with fan blades (7);
a cooling liquid pump (4) is arranged between the double-motor controller (6) and the double-layer cooling liquid tank (10), a liquid inlet of the cooling liquid pump (4) is communicated with the upper layer of the double-layer cooling liquid tank (10), a liquid outlet of the cooling liquid pump (4) is divided into two paths, one path is connected with a liquid inlet of a cooling pipeline inside the double-motor controller (6) through a pipeline, and the other path is connected with a liquid inlet of a cooling pipeline inside the double-hub motor (1) through a pipeline; an electric control ball valve (5) is arranged on the liquid inlet pipeline (11) of the dual-motor controller; a liquid outlet of an internal cooling pipeline of the double-motor controller (6) and a liquid outlet of an internal cooling pipeline of the double-hub motor (1) are respectively connected to the lower layer of the double-layer cooling liquid tank (10) through pipelines;
a first temperature sensor (8) is arranged in the double-hub motor (1), and a second temperature sensor (16) is arranged in a cooling pipeline in the double-motor controller (6);
the variable-speed electric liquid pump (3), the cooling liquid pump (4), the fan blades (7), the electric control ball valve (5), the liquid level sensor (14), the first temperature sensor (8), the second temperature sensor (16) and the third temperature sensor (17) are in signal connection with the electric control unit (13).
2. The intelligent cooling system for the double-hub motor and the controller thereof as claimed in claim 1, wherein the internal cooling pipeline of the double-motor controller (6) is arranged on the lower cover plate of the controller.
3. The intelligent cooling system for the double-hub motor and the controller thereof as claimed in claim 2, wherein the cooling pipeline inside the double-motor controller (6) is a symmetrical continuous U-shaped pipe.
4. The intelligent cooling system of a double-hub motor and a controller thereof according to claim 1, wherein the fan blades (7) are internally provided with driving motors.
5. The intelligent cooling system of a double-hub motor and a controller thereof as claimed in claim 1, wherein the liquid inlet and the liquid outlet of the internal cooling pipeline of the double-hub motor (1) are arranged on the same plane.
6. The control method of the intelligent cooling system of the double-hub motor and the controller thereof according to any one of claims 1 to 5 is characterized by comprising the following steps:
the cooling liquid pump (4) runs, the liquid level sensor (14) acquires the upper layer real-time liquid level of the double-layer cooling liquid tank (10), and the electric control unit (13) controls the liquid pumping speed of the variable-speed electric liquid pump (3) according to the upper layer liquid level condition of the double-layer cooling liquid tank (10), so that the upper layer liquid capacity of the double-layer cooling liquid tank (10) is kept constant;
the method comprises the following steps that a first temperature sensor (8) obtains the real-time internal temperature of a double-hub motor (1), and an electric control unit (13) controls the liquid pumping speed of a cooling liquid pump (4) according to the real-time internal temperature of the double-hub motor (1), so that the internal temperatures of the two motors are maintained at a threshold value A;
the second temperature sensor (16) acquires the real-time temperature inside the dual-motor controller (6), and the electric control unit (13) controls the pump liquid speed of the cooling liquid pump (4) and adjusts the opening of the electric control ball valve (5) according to the real-time temperature inside the dual-motor controller (6), so that the internal temperature of the dual-motor controller (6) is maintained at a threshold value B;
the third temperature sensor (17) acquires the real-time temperature of the cooling liquid at the lower layer of the double-layer cooling liquid tank (10), and the electric control unit (13) controls the rotating speed of the fan blade (7) driving motor according to the real-time temperature of the cooling liquid at the lower layer, so that the real-time temperature of the cooling liquid is maintained at the threshold value C.
7. The control method of the intelligent cooling system of the double-hub motor and the controller thereof according to claim 6, wherein the controlling of the pump speed of the variable speed electric liquid pump (3) is specifically as follows: the real-time liquid level is lower than the liquid level threshold value, and the electric control unit (13) controls the speed of the variable-speed electric liquid pump (3) to increase; the real-time liquid level is higher than the liquid level threshold value, and the electric control unit (13) controls the speed of the variable-speed electric liquid pump (3) to be reduced.
8. The control method of the intelligent cooling system of the double-hub motor and the controller thereof according to claim 6, wherein the pump speed of the cooling liquid pump (4) is controlled by: when the real-time temperature in the double-hub motor (1) is lower than a temperature threshold value A, the electric control unit (13) controls the pump liquid speed of the cooling liquid pump (4) to be reduced; when the real-time temperature in the double-hub motor (1) is higher than a temperature threshold value A, the electric control unit (13) controls the liquid pumping speed of the cooling liquid pump (4) to be increased.
9. The control method of the intelligent cooling system of the double-hub motor and the controller thereof according to claim 6, wherein the controlling the pump speed of the cooling liquid pump (4) and the adjusting the opening degree of the electrically controlled ball valve (5) are specifically as follows: if the real-time temperature of the double-motor controller (6) is higher than the threshold value B and the real-time temperature of the double-hub motor (1) is not higher than the threshold value A, the opening degree of the electric control ball valve (5) is increased, and if the real-time temperature of the double-motor controller (6) is not reduced remarkably, the rotating speed of the cooling liquid pump (4) is increased; if the real-time temperature of the double-motor controller (6) is higher than the threshold B and the real-time temperature of the double-hub motor (1) is also higher than the threshold A, the rotating speed of the cooling liquid pump (4) is increased, and meanwhile, the opening degree of the electric control ball valve (5) is increased.
10. The control method of the intelligent cooling system of the double-hub motor and the controller thereof according to claim 6, wherein the control of the rotation speed of the fan blade (7) driving motor is specifically as follows: when the real-time temperature of the lower-layer cooling liquid is lower than a temperature threshold value C, the electric control unit (13) controls the rotating speed of a driving motor of the fan blades (7) to be reduced; when the real-time temperature of the lower-layer cooling liquid is higher than the temperature threshold value C, the electric control unit (13) controls the fan blades (7) to drive the motor to rotate at a higher speed.
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