Intelligent temperature control device of wind power gear box oil cooling system

Abstract

The utility model provides an intelligent temperature control device of a wind power gear box oil cooling system, which comprises a wind power gear box, an oil outlet pipe is fixedly communicated with the surface of the wind power gear box, a heat dissipation mechanism is arranged, and lubricating oil enters a first communicating pipe through the oil outlet pipe and exchanges heat with air through heat dissipation fins. The temperature of the lubricating oil is detected through the first temperature sensor, the semiconductor chilling plate is started, cooling liquid in the cooling cavity is cooled, the low-temperature cooling liquid exchanges heat with hot lubricating oil flowing through the second communicating pipe, the lubricating oil is cooled again, the cooled lubricating oil flows back into the wind power gear box, and circulation is conducted. When the air temperature is low, the reversing valve is started, the lubricating oil directly flows back into the wind power gear box through the backflow pipe, the lubricating oil is cooled after being rapidly heated, and the situation that the lubricating effect is poor due to the fact that the viscosity of the lubricating oil is large at the low temperature is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power gear box oil cooling technical field, concretely relates to an intelligent temperature control device of wind power gear box oil cooling system. BACKGROUND

[0002] The gear box in the wind generating set is an important mechanical component, and its main function is to transmit the power generated by the wind wheel under the action of wind to the generator and make the generator obtain corresponding rotating speed. When the gear box works, the mutual meshing between gears will produce wear, in order that the wear is reduced, lubricating oil will be added in the gear box, and the lubricating oil needs to be in a suitable temperature range, so that good lubricating effect can be ensured.

[0003] At present, the Chinese patent with the application number CN202320686085.8 discloses an oil cooler for wind power gear box, relates to the technical field of gear box heat dissipation, and comprises a heat exchange core body, an upper oil cavity and a lower oil cavity; the upper oil cavity and the lower oil cavity are fixed to the upper and lower sides of the heat exchange core body respectively; a heat dissipation fan is arranged on the outer side of the heat exchange core body; the heat exchange core body is in communication with the interiors of the upper oil cavity and the lower oil cavity respectively; a plurality of groups of heat dissipation fins are arranged on the left and right side plates of the heat exchange core body; all the heat dissipation fins are fixed through heat conduction materials and are distributed in a left-right symmetrical mode according to the heat exchange core body; the upper oil cavity is provided with an oil inlet; the lower oil cavity is provided with an oil outlet; the oil outlet is externally connected with an oil pump through a hose; and the oil pump is in communication with the oil inlet of the gear box through the hose. The device can solve the problem of poor heat dissipation effect of the gear box radiator, and achieve the beneficial effect of further improving heat exchange efficiency. However, the following defects still exist:

[0004] Only the lubricating oil can be cooled, the temperature of the lubricating oil cannot be adjusted, the viscosity of the lubricating oil is increased in a low-temperature environment, and the lubrication of the gear box is not facilitated; and the heat dissipation means is relatively single. UTILITY MODEL CONTENTS

[0005] The utility model discloses an intelligent temperature control device of wind power gear box oil cooling system to solve the problems in the background art.

[0006] The specific technical scheme is as follows:

[0007] An intelligent temperature control device of wind power gear box oil cooling system, comprising: a wind power gear box, the surface of the wind power gear box is fixedly connected with an oil outlet pipe, one end of the oil outlet pipe is fixedly connected with a cooling box, the cooling box is fixedly installed with a circulating pump away from one end of the oil outlet pipe, and the circulating pump is fixedly connected with the wind power gear box through a circulating pipe;

[0008] A heat dissipation mechanism is arranged in the cooling box and is used for cooling the lubricating oil in the wind power gear box.

[0009] A controller is arranged on one side of the cooling box and is used for controlling the operation of the equipment.

[0010] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the oil outlet pipe is fixedly connected with a reversing valve, the reversing valve is fixedly connected with a return pipe, and one end of the return pipe is fixedly connected with the wind power gear box.

[0011] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the oil outlet pipe is fixedly connected with a reversing valve, the reversing valve is fixedly connected with a return pipe, and one end of the return pipe is fixedly connected with the wind power gear box.

[0012] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the heat dissipation mechanism comprises a heat preservation partition plate fixedly connected to the inside of the cooling box, the heat preservation partition plate divides the heat dissipation mechanism into a cooling cavity and a cooling cavity, a first communication pipe is fixedly connected in the cooling cavity, and a second communication pipe is fixedly connected in the cooling cavity.

[0013] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the first communication pipe is fixedly connected with a plurality of heat dissipation fins, heat dissipation grooves corresponding to the heat dissipation fins are formed on both sides of the cooling cavity, and a heat dissipation fan is fixedly installed on one side of the cooling box.

[0014] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the second communication pipe is spirally arranged, a first temperature sensor is fixedly connected to one end of the second communication pipe close to the first communication pipe, and the other end of the second communication pipe is fixedly connected with the oil inlet of the circulating pump.

[0015] The intelligent temperature control device of the wind power gear box oil cooling system, wherein: the cooling cavity is fixedly connected with a semiconductor refrigeration piece, the semiconductor refrigeration piece is arranged towards the second communication pipe, the semiconductor refrigeration piece is arranged towards the outside of the cooling box, a heat conduction plate is fixedly connected to the surface of the cooling box and adheres to the heating end of the semiconductor refrigeration piece, an air deflector is fixedly connected to one side of the surface of the cooling box close to the heat conduction plate, a motor is fixedly installed on the surface of the cooling box, a stirring shaft is fixedly connected to the output shaft end of the motor, and the stirring shaft is rotatably connected in the cooling cavity.

[0016] The utility model has the following beneficial effects:

[0017] The heat dissipation mechanism is arranged, the lubricating oil enters the first communicating pipe through the oil outlet pipe, heat exchange is carried out between the lubricating oil and air through the heat dissipation fins, the temperature of the lubricating oil is monitored through the first temperature sensor, when the temperature is high, the heat dissipation fan is started, the heat dissipation fan drives air flow, the heat exchange speed of the heat dissipation fins and air is accelerated, and the heat dissipation effect is improved. The semiconductor refrigeration fin is started, the cooling liquid in the cooling cavity is cooled, the low-temperature cooling liquid exchanges heat with the hot lubricating oil flowing through the second communicating pipe, the lubricating oil is cooled again, the cooled lubricating oil flows back to the wind power gear box, and circulation is repeated, so that the lubricating oil maintains a suitable temperature. When the air temperature is low, the reversing valve is started, the lubricating oil directly flows back to the wind power gear box through the return pipe, the lubricating oil is rapidly heated, and then the lubricating oil is cooled, so that the poor lubrication effect caused by the large viscosity of the lubricating oil at low temperature is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure schematic view of the intelligent temperature control device of the wind power gear box oil cooling system is provided for the embodiment of the utility model.

[0019] Figure 2 A structure schematic view of the cooling box and the controller of the intelligent temperature control device of the wind power gear box oil cooling system is provided for the embodiment of the utility model.

[0020] Figure 3 A structure schematic view of the heat dissipation mechanism in the intelligent temperature control device of the wind power gear box oil cooling system is provided for the embodiment of the utility model.

[0021] Figure 4 A structure schematic view of the inside of the cooling box in the intelligent temperature control device of the wind power gear box oil cooling system is provided for the embodiment of the utility model.

[0022] In the drawings:

[0023] 1, wind power gear box; 2, oil outlet pipe; 3, cooling box; 4, circulating pump; 5, circulating pipe; 6, heat dissipation mechanism; 601, heat preservation partition; 602, cooling cavity; 603, cooling cavity; 604, heat dissipation groove; 605, first communicating pipe; 606, heat dissipation fin; 607, heat dissipation fan; 608, air deflector; 609, second communicating pipe; 610, first temperature sensor; 611, semiconductor refrigeration fin; 612, heat conduction plate; 613, motor; 614, stirring shaft; 7, controller; 8, reversing valve; 9, return pipe; 10, second temperature sensor; 12, third temperature sensor. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model is further illustrated below in combination with the drawings and through specific embodiments.

[0025] In the drawings, only for example, the representation is a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the patent; in order to better illustrate the embodiments of the utility model, some components of the drawings will be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, some well-known structures and their descriptions in the drawings can be omitted.

[0026] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element referred to must have a particular orientation, structure and operation, therefore, the positional relationship described in the drawings is only for example, and cannot be understood as a limitation of the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0027] In the description of the utility model, unless otherwise explicitly specified and limited, if the connection relationship between the components appears, the term should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0028] Embodiment

[0029] The utility model provides an intelligent temperature control device of wind power gear box oil cooling system, as shown in Figures 1-4 The utility model discloses a wind power gear box 1, and the surface of wind power gear box 1 is fixedly connected with an oil outlet pipe 2, one end of oil outlet pipe 2 is fixedly connected with a cooling box 3, and the end, away from oil outlet pipe 2, of cooling box 3 is fixedly installed with a circulating pump 4, and the oil outlet of circulating pump 4 is fixedly connected with wind power gear box 1 through a circulating pipe 5;A heat dissipation mechanism 6 is arranged in the cooling box 3 and is used for cooling the lubricating oil in the wind power gear box 1;A controller 7 is arranged on one side of the cooling box 3 and is used for controlling the operation of the equipment.

[0030] The intelligent temperature control device of the oil cooling system of the wind power gear box adopts the technical scheme, a heat dissipation mechanism 6 is arranged, the lubricating oil enters the first communication pipe 605 through the oil outlet pipe 2, heat exchange is carried out with air through the heat dissipation fin 606, the temperature of the lubricating oil is detected through the first temperature sensor 610, when the temperature is high, the heat dissipation fan 607 is started, the heat dissipation fan 607 drives air flow, the heat exchange speed of the heat dissipation fin 606 and the air is accelerated, and the heat dissipation effect is improved. The semiconductor refrigeration fin 611 is started, the cooling liquid in the cooling cavity 603 is cooled, the low-temperature cooling liquid exchanges heat with the hot lubricating oil flowing through the second communication pipe 609, the lubricating oil is cooled again, the cooled lubricating oil flows back to the wind power gear box 1, and circulation is carried out repeatedly, so that the lubricating oil maintains an appropriate temperature, when the air temperature is low, the reversing valve 8 is started, the lubricating oil directly flows back to the wind power gear box 1 through the return pipe 9, the lubricating oil is rapidly heated, and then heat dissipation is carried out, thereby avoiding poor lubrication effect caused by large low-temperature viscosity of the lubricating oil.

[0031] In order to rapidly heat the low-temperature lubricating oil, the oil outlet pipe 2 is fixedly connected with a reversing valve 8, the surface of the reversing valve 8 is fixedly connected with a return pipe 9, and one end of the return pipe 9 is fixedly connected with the wind power gear box 1.

[0032] In order to monitor the temperature of the lubricating oil and reduce the energy consumption of heat dissipation, a third temperature sensor 12 electrically connected with a controller 7 is fixedly connected to the oil outlet pipe 2, and a second temperature sensor 10 electrically connected with the controller 7 is fixedly connected to the return pipe 9 and the circulation pipe 5.

[0033] In order to carry out primary heat dissipation on the lubricating oil, the heat dissipation mechanism 6 comprises a heat preservation partition plate 601 fixedly connected to the inside of the cooling box 3, the heat dissipation mechanism 6 is divided into a cooling cavity 602 and a cooling cavity 603 by the heat preservation partition plate 601, the first communication pipe 605 is fixedly connected to the cooling cavity 602, the second communication pipe 609 is fixedly connected to the cooling cavity 603, and the first communication pipe 605 is fixedly connected with the second communication pipe 609. The lubricating oil enters the heat dissipation fin 606 through the first communication pipe 605 and exchanges heat with air.

[0034] In order to improve the heat exchange area of the lubricating oil and air, a plurality of heat dissipation fins 606 are fixedly connected to the first communication pipe 605, heat dissipation grooves 604 corresponding to the heat dissipation fins 606 are formed on both sides of the cooling cavity 602, and the cooling box 3 is fixedly installed with a heat dissipation fan 607 on one side.

[0035] In order to carry out secondary cooling on the lubricating oil and improve the contact area of the lubricating oil and the cooling liquid, the second communication pipe 609 is arranged in a spiral shape, the first temperature sensor 610 is fixedly connected to one end of the second communication pipe 609 close to the first communication pipe 605, and the other end of the second communication pipe 609 is fixedly connected with the oil inlet of the circulating pump 4. The cooling cavity 603 is filled with cooling liquid

[0036] In order to further reduce the temperature of the lubricating oil. The inner wall of the cooling cavity 603 is fixedly connected with a semiconductor refrigerating sheet 611, the refrigerating end of the semiconductor refrigerating sheet 611 is arranged towards the second communication pipe 609, the heating end of the semiconductor refrigerating sheet 611 is arranged towards the outside of the cooling box 3, the surface of the cooling box 3 is fixedly connected with a heat conduction plate 612 which is attached to the heating end of the semiconductor refrigerating sheet 611, the surface of the cooling box 3 is fixedly connected with an air deflector 608 on the side close to the heat conduction plate 612, the surface of the cooling box 3 is fixedly installed with a motor 613, the output shaft end of the motor 613 is fixedly connected with a stirring shaft 614 which is rotatably connected in the cooling cavity 603. The cooling liquid is cooled by the semiconductor refrigerating sheet 611, the motor 613 is started to drive the stirring shaft 614 to rotate, so as to stir the cooling liquid, the temperature of the cooling liquid is kept uniform, and the lubricating oil in the second communication pipe 609 is cooled by the cooling liquid.

[0037] Among them, the controller 7 can select Siemens s7-300 series PLC controller;

[0038] The third temperature sensor 12 is installed on the pipeline of the oil outlet pipe 2, connected with the AI1 port of the controller 7 through the analog signal line such as 4-20mA, and monitors the initial temperature of the lubricating oil in real time.

[0039] The second temperature sensor 10 is installed on the pipeline of the return pipe 9 and the circulation pipe 5 respectively, connected with the AI2 and AI3 ports of the controller 7 through the analog signal line, and monitors the temperature of the lubricating oil in the return and circulation stages.

[0040] The first temperature sensor 610 is installed on the second communication pipe 609 close to the first communication pipe 605, connected with the DI1 port of the controller 7 through the digital signal line, and detects the temperature of the lubricating oil after secondary cooling;

[0041] The cooling fan 607 is connected with the DO1 port of the controller 7, and the fan speed is controlled by PWM signal.

[0042] The semiconductor refrigerating sheet 611 is connected with the DO2 port of the controller 7 through the relay module, and the start-stop and refrigeration power are controlled by the switch signal output by the controller.

[0043] The motor 613 drives the stirring shaft 614, which is connected with the DO3 port of the controller 7, and the motor speed is adjusted by the frequency converter.

[0044] The circulation pump 4 is connected with the DO4 port of the controller 7, and the start-stop and flow adjustment are controlled.

[0045] The reversing valve 8 is connected with the DO5 port of the controller 7, and the switching direction is controlled by digital signal to make the oil outlet pipe or the return pipe conductive;

[0046] Power module: the controller 7 is connected with external 24V DC power supply through power line, and provides stable voltage power supply for sensors and executing elements.

[0047] Communication interface: the controller 7 is configured with RS485 or Ethernet interface, which is used for communication with host computer or remote monitoring system, and transmits temperature data and running state;

[0048] Low temperature mode: lubricating oil temperature < T1:

[0049] When the third temperature sensor 12 detects that the lubricating oil temperature is lower than the set threshold T1, the controller 7 outputs a signal to the reversing valve 8, and switches to the return pipe 9 passage, so that the lubricating oil directly flows back into the gear box 1 to quickly increase the temperature.

[0050] The circulating pump 4 keeps low-speed operation to ensure the circulation of lubricating oil.

[0051] Normal heat dissipation mode: T1≤temperature < T2:

[0052] When the third temperature sensor 12 detects that the temperature rises above T1 but is lower than the high temperature threshold T2, the controller 7 closes the reversing valve 8 and switches to the oil outlet pipe 2 passage.

[0053] The lubricating oil enters the cooling fin 606 for natural air cooling, and the cooling fan 607 adjusts the rotation speed PWM duty cycle according to the feedback of the first temperature sensor 610.

[0054] Forced cooling mode: temperature ≥ T2:

[0055] If the first temperature sensor 610 detects that the temperature is still higher than T2, the controller 7 starts the semiconductor cooling sheet 611 and the motor 613 to forcibly cool the cooling liquid in the cooling cavity 603.

[0056] The motor 613 drives the stirring shaft 614 to rotate at a uniform speed to ensure that the cooling liquid temperature is uniform; the cooling fan 607 runs at full speed to accelerate the heat generated by the semiconductor cooling sheet 611.

[0057] The circulating pump 4 switches to high-speed mode to increase the flow of lubricating oil to enhance the heat dissipation efficiency.

[0058] Protection mechanism:

[0059] If the second temperature sensor 10 detects that the temperature of the circulating pipe 5 or the return pipe 9 is abnormal, such as exceeding the limit or the sensor fails, the controller 7 triggers an alarm signal and suspends the system operation.

[0060] The controller 7 has an overload protection program built-in, which monitors the current of the executing elements in real time, and automatically cuts off the power supply when it is abnormal.

[0061] Precise temperature control: through multi-stage temperature sensor feedback and controller logic decision, realize the dynamic regulation of lubricating oil temperature, avoid low temperature viscosity is too high or high temperature lubrication failure.

[0062] Energy efficiency optimization: the equipment such as heat dissipation fan, semiconductor refrigerating sheet is started and stopped as needed, combined with variable frequency speed regulation technology, significantly reduces the system energy consumption.

[0063] Automatic operation: the controller 7 integrates communication function, supports remote monitoring and parameter setting, improves the intelligent level of the system.

[0064] In summary, the intelligent temperature control device of the wind power gear box oil cooling system provided by the embodiment has the following advantages: the heat dissipation mechanism 6 is provided, the lubricating oil enters the first communication pipe 605 through the oil outlet pipe 2, heat exchange is carried out between the lubricating oil and the air through the heat dissipation fin 606, the temperature of the lubricating oil is detected through the first temperature sensor 610, when the temperature is high, the heat dissipation fan 607 is started, the heat dissipation fan 607 drives the air flow, accelerates the heat exchange speed between the heat dissipation fin 606 and the air, and improves the heat dissipation effect. The semiconductor refrigerating sheet 611 is started, and the cooling liquid in the cooling cavity 603 is cooled. The low-temperature cooling liquid exchanges heat with the hot lubricating oil flowing through the second communication pipe 609, and the lubricating oil is cooled again. The cooled lubricating oil flows back into the wind power gear box 1, and circulates repeatedly, so that the lubricating oil maintains an appropriate temperature. When the air temperature is low, the reversing valve 8 is started, so that the lubricating oil directly flows back into the wind power gear box 1 through the return pipe 9, so that the lubricating oil is quickly heated, and then cooled, to avoid poor lubrication caused by high viscosity of the lubricating oil at low temperature.

[0065] When in use, the lubricating oil in the wind power gear box 1 is pumped out through the circulating pump 4, the temperature of the lubricating oil is detected through the third temperature sensor 12, when the temperature is lower than the set temperature, the reversing valve 8 is started, so that the lubricating oil directly flows back to the wind power gear box 1 through the return pipe 9, so that the lubricating oil is heated when the wind power gear box 1 works, and the lubricating effect of the lubricating oil is improved.

[0066] When the temperature is higher than the set temperature, the lubricating oil enters the first communication pipe 605 through the oil outlet pipe 2, heat exchange is carried out between the lubricating oil and the air through the heat dissipation fin 606, the temperature of the lubricating oil is detected through the first temperature sensor 610, when the temperature reaches the set interval, the lubricating oil directly returns to the circulating pipe 5 through the second communication pipe 609, and finally enters the wind power gear box 1, and circulates repeatedly. When the first temperature sensor 610 detects that the temperature of the lubricating oil is still high, the semiconductor refrigerating sheet 611 and the motor 613 are started, the semiconductor refrigerating sheet 611 cools the cooling liquid in the cooling cavity 603, the cooling liquid cools the lubricating oil, and the cooling effect is improved. The heat dissipation fan 607 is started, which can not only cool the lubricating oil in the heat dissipation fin 606, but also discharge the heat generated by the semiconductor refrigerating sheet 611.

[0067] The above merely describes the preferred embodiments of the present application, and is not intended to limit the embodiments and the protection scope of the present application. For those skilled in the art, it should be understood that all the equivalent replacements and obvious changes made according to the content of the present application and the drawings should be included in the protection scope of the present application.

Claims

1. An intelligent temperature control device for an oil-cooling system of a wind turbine gearbox, characterized in that, include: A wind turbine gearbox (1) has an oil outlet pipe (2) fixedly connected to its surface. A cooling box (3) is fixedly connected to one end of the oil outlet pipe (2). A circulation pump (4) is fixedly installed at the end of the cooling box (3) away from the oil outlet pipe (2). The oil outlet of the circulation pump (4) is fixedly connected to the wind turbine gearbox (1) through a circulation pipe (5). The heat dissipation mechanism (6) is installed in the cooling box (3) and is used to cool the lubricating oil in the wind turbine gearbox (1); The controller (7) is located on one side of the cooling box (3) and is used to control the operation of the equipment.

2. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 1, characterized in that, A reversing valve (8) is fixedly connected to the oil outlet pipe (2), and a return pipe (9) is fixedly connected to the surface of the reversing valve (8). One end of the return pipe (9) is fixedly connected to the wind turbine gearbox (1).

3. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 2, characterized in that, A third temperature sensor (12) electrically connected to the controller (7) is fixedly connected to the oil outlet pipe (2), and a second temperature sensor (10) electrically connected to the controller (7) is fixedly connected to both the return pipe (9) and the circulation pipe (5).

4. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 1, characterized in that, The heat dissipation mechanism (6) includes an insulation partition (601) fixedly connected inside the cooling box (3). The insulation partition (601) divides the interior of the heat dissipation mechanism (6) into a cooling chamber (602) and a cooling chamber (603). A first connecting pipe (605) is fixedly connected inside the cooling chamber (602), and a second connecting pipe (609) is fixedly connected inside the cooling chamber (603). The first connecting pipe (605) and the second connecting pipe (609) are fixedly connected.

5. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 4, characterized in that, The first connecting pipe (605) is fixedly connected to a plurality of heat sinks (606), and the cooling chamber (602) has heat sink grooves (604) on both sides corresponding to the heat sinks (606). A cooling fan (607) is fixedly installed on one side of the cooling box (3).

6. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 5, characterized in that, The second connecting pipe (609) is spirally arranged. The first temperature sensor (610) is fixedly connected to one end of the second connecting pipe (609) near the first connecting pipe (605), and the other end of the second connecting pipe (609) is fixedly connected to the oil inlet of the circulating pump (4).

7. The intelligent temperature control device for the wind turbine gearbox oil cooling system according to claim 6, characterized in that, A semiconductor refrigeration chip (611) is fixedly connected to the inner wall of the cooling chamber (603). The cooling end of the semiconductor refrigeration chip (611) faces the second connecting pipe (609), and the heating end of the semiconductor refrigeration chip (611) faces the outside of the cooling box (3). A heat-conducting plate (612) that is in contact with the heating end of the semiconductor refrigeration chip (611) is fixedly connected to the surface of the cooling box (3). A wind guide plate (608) is fixedly connected to the side of the surface of the cooling box (3) near the heat-conducting plate (612). A motor (613) is fixedly installed on the surface of the cooling box (3). A stirring shaft (614) is fixedly connected to the output shaft end of the motor (613). The stirring shaft (614) is rotatably connected inside the cooling chamber (603).

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