Gearbox cooling device with temperature monitoring function

Abstract

The invention provides a gearbox cooling device with a temperature monitoring function, and belongs to the technical field of gearboxes. Comprising a box body, a main shaft rotationally installed in the middle of the interior of the box body, a worm gear fixedly connected to the side wall of the middle of the main shaft, a worm rotationally installed on the side wall of the interior of the box body, an auxiliary bevel gear fixedly connected to the side wall of the worm and a driving shaft rotationally installed on the side wall of the box body. The main bevel gear is fixedly connected to the end part of the driving shaft; the cooling assembly comprises a cover plate installed at the end of the box body and a liquid storage box installed on the side wall of the box body in a matched mode. The cooling device has the beneficial effects that heat generated by key parts of the gear box in the operation process can be rapidly and effectively taken away through matched use of the gear box assembly and the cooling assembly, it is guaranteed that the gear box stably operates in the high-temperature environment, the temperature of the end of a worm is conveniently and accurately monitored in real time, and the working state of a cooling system is conveniently adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of gear boxes, and in particular relates to a gear box cooling device with a temperature monitoring function. Background Art

[0002] In the modern industrial production system, gearboxes, as the core components of mechanical transmission systems, are widely used in various types of mechanical equipment, such as wind power generation equipment, mining machinery, metallurgical equipment, ship power systems, and automobile manufacturing. Its main function is to achieve the change of speed, torque conversion, and power transmission through the meshing transmission of gears, ensuring that the equipment can operate stably according to the predetermined working conditions.

[0003] With the continuous advancement of industrial technology, the operating power and efficiency of mechanical equipment are constantly improving, which puts higher requirements on the performance of gearboxes. During the operation of the gearbox, a large amount of heat will be generated due to gear meshing, bearing friction and other reasons. Excessive temperature will not only cause the viscosity of the lubricating oil to decrease, reduce the lubrication effect, and aggravate the wear of gears and bearings, but may also cause thermal deformation of gearbox parts, affect the meshing accuracy of gears, and thus reduce the transmission efficiency and reliability of the equipment. In severe cases, it may even cause equipment failure, resulting in production interruption and huge economic losses.

[0004] Traditional gearbox cooling methods have many limitations. Early natural cooling methods relied on natural convection of air to dissipate heat, which had extremely low cooling efficiency and could not meet the heat dissipation requirements of high-power equipment. Although simple air cooling has improved the heat dissipation speed to a certain extent, its cooling effect is still limited for gearboxes running at high temperatures and high loads. Some traditional liquid cooling systems lack accurate temperature monitoring and control mechanisms, and the flow rate and cooling intensity of the coolant cannot be adjusted in real time according to the actual temperature changes of the gearbox, which can easily lead to insufficient cooling or overcooling. Insufficient cooling will cause the gearbox temperature to be too high, affecting the performance and life of the equipment; overcooling will cause energy waste and increase operating costs. Summary of the invention

[0005] The object of the present invention is to provide a gearbox cooling device with a temperature monitoring function, aiming to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A gearbox cooling device with temperature monitoring function, comprising: The gearbox assembly comprises a housing, a main shaft rotatably mounted in the middle position of the housing, a worm wheel fixedly connected to the middle side wall of the main shaft, a worm rotatably mounted on the inner side wall of the housing, a secondary bevel gear fixedly connected to the side wall of the worm, a driving shaft rotatably mounted on the side wall of the housing, and a main bevel gear fixedly connected to the end of the driving shaft, wherein the main bevel gear is meshedly connected with the secondary bevel gear, and the upper end side wall of the worm is meshedly connected with the worm wheel; A cooling assembly includes a cover plate installed at the end of the box body, a liquid storage tank adapted to be installed on the side wall of the box body, a liquid pump installed at the end of the cover plate, a sleeve for installing a sensor installed on the inner wall of the cover plate, and a return pipe installed on the side wall of the main shaft, wherein the end of the sleeve for installing the sensor extends to the side wall of the worm end, the liquid inlet of the liquid pump is connected with the liquid storage tank through a pipeline, the end of the return pipe is connected with the liquid inlet of the liquid storage tank through a pipeline, and the side wall of the box body end is provided with a guide groove structure matching the main shaft end and the worm end.

[0007] As a preferred solution of the present invention, the gearbox assembly further comprises bearings adapted to be mounted on the ends of the main shaft and the worm, and the bearing seal is mounted below the cover plate.

[0008] As a preferred solution of the present invention, the gear box assembly also includes a ring fixedly connected to the upper side wall of the box body, and a sealing ring fixedly connected to the inner wall of the ring, the ring is sleeved on the outside of the main shaft, and the sealing ring is sealingly sleeved on the side wall of the main shaft.

[0009] As a preferred solution of the present invention, the gear box assembly further comprises a rotating rod fixedly connected to the end of the main shaft, and the end of the rotating rod is mounted above the collar.

[0010] As a preferred solution of the present invention, the gear box assembly further comprises a sleeve sealedly connected to the side wall of the box body, and the drive shaft is rotatably mounted on the inner wall of the sleeve.

[0011] As a preferred solution of the present invention, the gear box assembly further comprises an inspection plate fixedly connected to the bottom of the box body, and the inspection plate is butted against the bottom bearing of the main shaft.

[0012] As a preferred solution of the present invention, the cooling assembly further comprises a plug installed on the side wall of the liquid storage tank, and the end of the plug is sealed and inserted in the middle of the through hole at the bottom of the liquid storage tank.

[0013] Compared with the prior art, the beneficial effects of the present invention are: through the coordinated use of the gearbox assembly and the cooling assembly, the heat generated by the key components of the gearbox during operation can be quickly and effectively removed, ensuring the stable operation of the gearbox in a high temperature environment, and improving the reliability and service life of the equipment. The temperature sensor installed in the casing for installing the sensor can monitor the temperature of the worm end in real time and accurately, providing intuitive data support for the operating status of the equipment, facilitating the operator to adjust the working status of the cooling system in a timely manner, and avoiding damage to the equipment due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front structural schematic diagram of the present invention; Figure 3 It is a side structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure at AA of the present invention.

[0015] In the figure: 100, gear box assembly; 101, main shaft; 102, worm wheel; 103, worm; 104, secondary bevel gear; 105, drive shaft; 106, main bevel gear; 107, bearing; 108, collar; 109, sealing ring; 110, rotating rod; 111, bushing; 112, inspection plate; 113, housing; 200, cooling assembly; 201, cover plate; 202, liquid storage tank; 203, liquid pump; 204, sleeve for installing sensor; 205, return pipe; 206, plug. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Example

[0019] Reference Figure 1-4 , is an embodiment of the present invention, which provides a gearbox cooling device with a temperature monitoring function, comprising: The gearbox assembly 100 includes a housing 113, a main shaft 101 rotatably mounted in the middle position of the housing 113, a worm wheel 102 fixedly connected to the middle side wall of the main shaft 101, a worm 103 rotatably mounted on the inner side wall of the housing 113, a secondary bevel gear 104 fixedly connected to the side wall of the worm 103, a driving shaft 105 rotatably mounted on the side wall of the housing 113, and a main bevel gear 106 fixedly connected to the end of the driving shaft 105, the main bevel gear 106 is meshedly connected with the secondary bevel gear 104, and the upper end side wall of the worm 103 is meshedly connected with the worm wheel 102; The cooling assembly 200 includes a cover plate 201 installed at the end of the box body 113, a liquid storage tank 202 adapted to be installed on the side wall of the box body 113, a liquid pump 203 installed at the end of the cover plate 201, a sleeve 204 for installing a sensor installed on the inner wall of the cover plate 201, and a return pipe 205 installed on the side wall of the main shaft 101. The end of the sleeve 204 for installing the sensor extends to the side wall of the end of the worm 103, the liquid inlet of the liquid pump 203 is connected to the liquid storage tank 202 through a pipeline, and the end of the return pipe 205 is connected to the liquid inlet of the liquid storage tank 202 through a pipeline. The side wall of the end of the box body 113 is provided with a guide groove structure matching the end of the main shaft 101 and the end of the worm 103.

[0020] Among them, the housing 113, as the main structure of the gearbox, is usually cast with high-strength cast iron or aluminum alloy, has good rigidity and sealing, and can effectively accommodate and protect the internal transmission components. Its internal design has precise mounting holes and positioning structures to ensure the precise installation and stable operation of components such as the main shaft 101 and the worm 103. The side wall at the end of the housing 113 is provided with a guide groove structure that matches the end of the main shaft 101 and the end of the worm 103. The structure is used to guide the flow of coolant and realize the cooling of key components. The main shaft 101 is rotatably installed in the middle position inside the housing 113, and is supported by high-precision bearings to ensure that it can rotate smoothly and smoothly. The main shaft is generally made of high-quality alloy steel, and after heat treatment and precision machining, it has high strength and wear resistance to withstand the torque and load during the transmission process. A worm wheel 102 is fixedly connected to the middle side wall of the main shaft 101, which is used to mesh with the worm 103 to achieve the conversion of speed and torque. The worm wheel 102 is fixedly connected to the middle side wall of the main shaft 101 and rotates synchronously with the main shaft. The worm wheel is usually made of anti-friction materials such as bronze, and its tooth shape is precisely designed and processed. It has high meshing accuracy with the worm 103, can effectively transmit power, and has good transmission stability and low noise. The worm 103 is rotatably mounted on the inner side wall of the box 113, and is rotatably connected to the box through a bearing. The worm is generally made of high-strength alloy steel, and the surface is hardened to improve its wear resistance and transmission efficiency. A secondary bevel gear 104 is fixedly connected to the side wall of the worm 103, which is used to mesh with the main bevel gear 106 to realize the input of power and the change of direction. The upper side wall of the worm 103 is meshed and connected with the worm wheel 102, and the power is transmitted to the main shaft 101 by the worm transmission. The secondary bevel gear 104 is fixedly connected to the side wall of the worm 103 and rotates synchronously with the worm. The tooth profile of the secondary bevel gear is conical, and the meshing with the main bevel gear 106 can realize the orthogonal transmission of power, change the transmission direction of power, and meet different transmission requirements. The drive shaft 105 is rotatably mounted on the side wall of the box body 113, and is rotatably connected to the box body through the shaft sleeve 111. The drive shaft is generally made of high-quality alloy steel, has high strength and rigidity, and is used to input external power. The main bevel gear 106 is fixedly connected to the end of the drive shaft 105, and the main bevel gear 106 is meshed and connected with the secondary bevel gear 104 to transmit the power of the drive shaft to the worm 103. The main bevel gear 106 is fixedly connected to the end of the drive shaft 105 and rotates synchronously with the drive shaft. The tooth profile design of the main bevel gear matches the secondary bevel gear 104, has high meshing accuracy, can efficiently transmit power, and ensure the reliability and stability of the transmission. The cover plate 201 is installed at the end of the box body 113, generally made of metal sheet, connected to the box body by bolts or sealant, and plays the role of closing the box body and installing other components.A liquid pump 203 is installed at the end of the cover plate 201 for extracting the coolant and delivering it to the part that needs cooling; a sleeve 204 for installing a sensor is installed on the inner wall of the cover plate 201 for installing a temperature sensor to monitor the temperature of the key parts inside the gearbox. The liquid storage tank 202 is adapted to be installed on the side wall of the box body 113 for storing coolant. The liquid storage tank is generally made of plastic or metal, has a certain volume and strength, and can meet the demand for coolant during operation of the equipment. The liquid pump 203 is installed at the end of the cover plate 201 and is connected to the liquid storage tank 202 through a pipeline. The liquid pump generally adopts a centrifugal pump or a gear pump, has sufficient head and flow, can extract the coolant in the liquid storage tank, and deliver it to the part that needs cooling, such as the main shaft 101 and the worm 103, through a pipeline. The sleeve 204 for installing the sensor is installed on the inner wall of the cover plate 201, and the end extends to the side wall of the end of the worm 103. The sleeve for installing the sensor is generally made of metal or high-temperature resistant plastic, with a hollow interior, for installing the temperature sensor. The temperature sensor can accurately measure the temperature of the end of the worm 103 through the sleeve for installing the sensor, providing data support for the operating status monitoring of the equipment. The return pipe 205 is installed on the side wall of the main shaft 101, and the end is connected to the liquid inlet of the liquid storage tank 202 through a pipeline. The return pipe is used to return the cooled coolant to the liquid storage tank to achieve the recycling of the coolant. The return pipe is generally made of metal or corrosion-resistant plastic, has a certain strength and corrosion resistance, and ensures the smooth return of the coolant.

[0021] Specifically, the gearbox assembly 100 further includes a bearing 107 adapted to be installed at the ends of the main shaft 101 and the worm 103 , and the bearing 107 is sealed and installed below the cover plate 201 .

[0022] The bearing 107 is adapted to be installed at the ends of the main shaft 101 and the worm 103, and adopts a rolling bearing with good sealing performance, such as a deep groove ball bearing or an angular contact ball bearing. The bearing is installed under the cover plate 201, which, on the one hand, provides support for the shaft to ensure its stable rotation; on the other hand, good sealing performance can prevent lubricating oil leakage and external impurities from invading, thereby extending the service life of the bearing.

[0023] Furthermore, the gearbox assembly 100 also includes a collar 108 fixedly connected to the upper side wall of the housing 113 , and a sealing ring 109 fixedly connected to the inner wall of the collar 108 . The collar 108 is sleeved on the outside of the main shaft 101 , and the sealing ring 109 is sealingly sleeved on the side wall of the main shaft 101 .

[0024] The collar 108 is fixedly connected to the upper side wall of the housing 113 and sleeved on the outside of the main shaft 101. The collar is generally made of metal material, plays the role of auxiliary support and positioning of the main shaft, and provides an installation basis for the sealing ring 109. The sealing ring 109 is fixedly connected to the inner wall of the collar 108, and the sealing sleeve is arranged on the side wall of the main shaft 101. The sealing ring is usually made of materials such as rubber or fluororubber, has good elasticity and sealing performance, can effectively prevent lubricating oil leakage, and ensure the lubrication environment inside the gearbox.

[0025] Furthermore, the gear box assembly 100 further includes a rotating rod 110 fixedly connected to the end of the main shaft 101 , and the end of the rotating rod 110 is installed above the collar 108 .

[0026] The rotating rod 110 is fixedly connected to the end of the main shaft 101 and installed above the collar 108. The rotating rod is generally a metal rod, and its function is to facilitate the operator to manually rotate the main shaft to perform equipment debugging, maintenance and other operations.

[0027] Preferably, the gear box assembly 100 further includes a shaft sleeve 111 sealedly connected to a side wall of the box body 113 , and the drive shaft 105 is rotatably mounted on an inner wall of the shaft sleeve 111 .

[0028] The shaft sleeve 111 is sealed and connected to the side wall of the housing 113, and the drive shaft 105 is rotatably mounted on the inner wall of the shaft sleeve 111. The shaft sleeve is generally made of anti-friction materials such as copper alloy or engineering plastics, and has good wear resistance and self-lubricating properties, which can reduce the friction between the drive shaft and the housing, ensure the smooth rotation of the drive shaft, and play a sealing role to prevent lubricating oil leakage.

[0029] It should be noted that the gear box assembly 100 further includes an inspection plate 112 fixedly connected to the bottom of the box body 113 , and the inspection plate 112 is butted against the bottom bearing of the main shaft 101 .

[0030] The inspection plate 112 is fixedly connected to the bottom of the box 113 and docked with the bottom bearing of the main shaft 101. The inspection plate 112 is generally made of metal sheet and connected to the box by bolts or buckles, etc., for easy disassembly. During equipment maintenance and overhaul, the inspection plate 112 can be opened to inspect, replace or lubricate the main shaft bottom bearing and other components.

[0031] Preferably, the cooling assembly 200 further includes a plug 206 installed on the side wall of the liquid storage tank 202 , and an end of the plug 206 is sealed and inserted in the middle of the bottom through hole of the liquid storage tank 202 .

[0032] The plug 206 is installed on the side wall of the liquid storage tank 202, and the end is sealed and plugged in the middle of the through hole at the bottom of the liquid storage tank 204. The plug 206 is generally made of rubber or plastic material, has good sealing performance, and can prevent coolant leakage. When it is necessary to discharge the coolant or maintain the liquid storage tank, the plug 206 can be opened.

[0033] When in use, external power is input through the drive shaft 105, and the main bevel gear 106 at the end of the drive shaft meshes with the secondary bevel gear 104 on the worm 103, transmitting power to the worm 103, causing the worm to rotate. The upper end of the worm 103 meshes with the worm wheel 102, which in turn drives the main shaft 101 to rotate, realizing power transmission and speed and torque conversion, meeting the working requirements of the equipment.

[0034] The liquid pump 203 is started to extract the coolant in the liquid storage tank 202 and transport it to the guide groove structure on the end side wall of the box body 113 through the pipeline. The coolant flows along the guide groove to the main shaft 101 and the worm 103 and other parts that need to be cooled, absorbing the heat generated by these parts during operation, and cooling the key parts of the gearbox. The cooled coolant flows back to the liquid storage tank 202 through the return pipe 205, completing the circulation cooling process of the coolant.

[0035] The temperature sensor installed in the sensor-mounting sleeve 204 monitors the temperature at the end of the worm 103 in real time and transmits the temperature signal to the control system. The control system adjusts the working state of the liquid pump 203 according to the preset temperature threshold. When the temperature is too high, the control system increases the flow of the liquid pump 203 to enhance the cooling effect; when the temperature is normal, the liquid pump 203 maintains a normal working state to ensure that the gearbox always operates within a suitable temperature range.

[0036] In summary, by driving the coolant to circulate through a liquid pump, the heat generated by the key components of the gearbox during operation can be quickly and effectively removed, ensuring the stable operation of the gearbox in a high-temperature environment and improving the reliability and service life of the equipment. The temperature sensor installed in the casing for installing the sensor can monitor the temperature of the worm end in real time and accurately, providing intuitive data support for the operating status of the equipment, facilitating operators to adjust the working status of the cooling system in a timely manner to avoid equipment damage due to excessive temperature. The sealing design of components such as bearings, sealing rings and sleeves effectively prevents lubricating oil leakage and intrusion of external impurities, ensuring good lubrication and working environment inside the gearbox, and extending the maintenance cycle of the equipment. The design of the inspection panel and plug facilitates the inspection and maintenance of the internal components of the equipment, as well as the discharge of coolant and the cleaning of the storage tank, reducing the difficulty and cost of equipment maintenance.

[0037] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0038] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0039] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gearbox cooling device with temperature monitoring function, characterized in that: include, A gearbox assembly (100) comprises a housing (113), a main shaft (101) rotatably mounted at a middle position inside the housing (113), a worm wheel (102) fixedly connected to a middle side wall of the main shaft (101), a worm (103) rotatably mounted on an inner side wall of the housing (113), a secondary bevel gear (104) fixedly connected to a side wall of the worm (103), a drive shaft (105) rotatably mounted on a side wall of the housing (113), and a main bevel gear (106) fixedly connected to an end of the drive shaft (105), wherein the main bevel gear (106) is meshingly connected to the secondary bevel gear (104), and the upper end side wall of the worm (103) is meshingly connected to the worm wheel (102); A cooling assembly (200) comprises a cover plate (201) mounted at the end of the housing (113), a liquid storage tank (202) adapted to be mounted on the side wall of the housing (113), a liquid pump (203) mounted at the end of the cover plate (201), a sleeve (204) mounted on the inner wall of the cover plate (201) for mounting a sensor, and a return pipe (205) mounted on the side wall of the spindle (101), wherein the end of the sleeve (204) for mounting the sensor extends to the side wall of the end of the worm (103), the liquid inlet of the liquid pump (203) is connected to the liquid storage tank (202) through a pipeline, the end of the return pipe (205) is connected to the liquid inlet of the liquid storage tank (202) through a pipeline, and the side wall of the end of the housing (113) is provided with a guide groove structure matching the end of the spindle (101) and the end of the worm (103).

2. A gearbox cooling device with temperature monitoring function according to claim 1, characterized in that: The gearbox assembly (100) further comprises a bearing (107) adapted to be mounted on the ends of the main shaft (101) and the worm (103), and the bearing (107) is sealed and mounted below the cover plate (201).

3. A gearbox cooling device with temperature monitoring function according to claim 2, characterized in that: The gearbox assembly (100) further comprises a collar (108) fixedly connected to the upper side wall of the housing (113), and a sealing ring (109) fixedly connected to the inner wall of the collar (108); the collar (108) is sleeved on the outside of the main shaft (101), and the sealing ring (109) is sealingly sleeved on the side wall of the main shaft (101).

4. The gearbox cooling device with temperature monitoring function according to claim 3 is characterized in that: The gearbox assembly (100) further comprises a rotating rod (110) fixedly connected to the end of the main shaft (101), and the end of the rotating rod (110) is mounted above the collar (108).

5. The gearbox cooling device with temperature monitoring function according to claim 4, characterized in that: The gearbox assembly (100) further comprises a shaft sleeve (111) sealingly connected to the side wall of the housing (113), and the drive shaft (105) is rotatably mounted on the inner wall of the shaft sleeve (111).

6. The gearbox cooling device with temperature monitoring function according to claim 5, characterized in that: The gearbox assembly (100) further comprises an inspection plate (112) fixedly connected to the bottom of the box body (113), and the inspection plate (112) is butted against a bottom bearing of the main shaft (101).

7. The gearbox cooling device with temperature monitoring function according to claim 6, characterized in that: The cooling assembly (200) further comprises a plug (206) mounted on the side wall of the liquid storage tank (202), wherein an end of the plug (206) is sealed and inserted in the middle of a through hole at the bottom of the liquid storage tank (202).

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