Coal mine fully mechanized coal mining face frequency converter water-cooling heat dissipation system and combined frequency conversion equipment

Abstract

The invention provides a coal mine fully mechanized coal mining face frequency converter water cooling heat dissipation system and a combined frequency conversion device.The coal mine fully mechanized coal mining face frequency converter water cooling heat dissipation system comprises a water cooling circulation loop and a controller, the water cooling circulation loop comprises a water tank, a circulation pump, a heat exchanger and a water-air heat dissipation assembly, and the heat exchanger is attached to a frequency converter; the water tank comprises a main water sump and an air compensator, a liquid level sensor is arranged on the main water sump, the air compensator is arranged on the main water sump and comprises a first channel and a second channel, a one-way valve is arranged in the first channel, and the first channel is used for exhausting gas in the main water sump; an air supplementing pump is arranged on the second channel, the air supplementing pump, the liquid level sensor and the controller are electrically connected, and the air supplementing pump is used for being opened or closed according to the liquid level information collected by the liquid level sensor so as to inject air into the main water sump. Heat generated by the frequency converter can be effectively absorbed and dissipated, and the heat dissipation efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of frequency converter heat dissipation, and in particular to a water-cooling heat dissipation system for a frequency converter of a fully mechanized coal mining working face and a combined frequency converter device for a fully mechanized coal mining working face. Background Art

[0002] In coal mining operations, heavy equipment such as scraper conveyors, transfer machines, crushers, etc. all need to use inverters to achieve precise speed regulation and soft start control. In order to meet the needs of multi-equipment collaborative operations, high-power combined inverters are currently widely used. During operation, they usually use internal cooling water cooling to dissipate heat. However, the current cooling water system often uses a full external discharge method, and the combined inverter has a large demand for cooling water, which not only causes a serious waste of water resources, but also exacerbates the water shortage in an environment such as coal mines where water resources are relatively limited. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] During the operation of the combined inverter, a large amount of heat will be generated due to the internal electronic components working in a high-frequency and high-voltage environment. In order to ensure that these electronic components will not be damaged due to overheating, the combined inverter usually uses internal cooling water cooling to dissipate heat. This cooling method uses the cooling water provided by the coal mine spray station to take away the heat generated by the inverter during operation, thereby maintaining the normal operating temperature of the inverter and ensuring its long-term stable operation.

[0005] However, in the complex environment of coal mines, the amount of water that the coal mine spray station can provide as a source of cooling water is relatively limited. However, the combined inverter has a relatively large demand for cooling water. This creates a contradiction: on the one hand, the combined inverter needs enough cooling water to ensure its heat dissipation effect; on the other hand, the amount of water that the coal mine spray station can provide is difficult to meet this demand.

[0006] In addition, most combined inverters use cooling water to dissipate heat. This cooling method does bring certain convenience in design, but it also brings serious water resource waste, which not only increases the water cost of coal mining enterprises, but also may have a certain impact on the ecological environment around the coal mines.

[0007] To this end, the present invention provides a water-cooling heat dissipation system for a frequency converter of a fully mechanized coal mining working face and a combined frequency converter, which can effectively absorb and dissipate the heat generated by the frequency converter, thereby helping to improve the heat dissipation efficiency.

[0008] The water-cooling and heat dissipation system for the inverter of the coal mine comprehensive mining working face provided by the embodiment of the present invention includes a water-cooling circulation loop and a controller. The water-cooling circulation loop includes a water tank, a circulation pump, a heat exchanger and a water-air heat dissipation component. The water tank, the circulation pump, the heat exchanger and the water-air heat dissipation component are connected by a pipeline. The heat exchanger is arranged in a one-to-one correspondence with the inverter. The heat exchanger is fitted on the inverter. The water tank includes a main water tank and an air compensator. A liquid level sensor is provided on the main water tank. The air compensator is provided on the main water tank. The air compensator includes a first channel and a second channel. A one-way valve is provided in the first channel. The first channel is used to discharge the gas in the main water tank; an air supply pump is provided on the second channel. The air supply pump, the liquid level sensor and the controller are electrically connected. The air supply pump is used to open or close according to the liquid level information collected by the liquid level sensor to inject air into the main water tank.

[0009] In summary, the water-cooling heat dissipation system for the inverter of the coal mine fully mechanized working face provided by the present invention can adjust the air volume in the water tank in real time through the air compensator to ensure that there is sufficient heat exchange medium (water) in the water cooling circulation loop, thereby effectively absorbing and dissipating the heat generated by the inverter. This intelligent control system not only improves the heat dissipation efficiency, but also enhances the stability and reliability of the system, providing a strong guarantee for the long-term stable operation of the inverter.

[0010] In some embodiments, the water tank also includes a water replenishment tank and a water replenishment pump. A water replenishment pipe is provided between the main water tank and the water replenishment tank. The water replenishment pump is arranged on the water replenishment pipe. The water replenishment pump, the liquid level sensor and the controller are electrically connected. The water replenishment pump is used to open or close according to the liquid level information collected by the liquid level sensor to fill water into the main water tank.

[0011] In some embodiments, the controller further includes a pressure sensor, which is disposed on the heat exchanger. The water replenishment pump is used to start injecting water into the main water tank when the pressure sensor detects that the fluid pressure in the heat exchanger is lower than a pressure threshold.

[0012] In some embodiments, the water-air heat dissipation assembly also includes a radiator, a wind duct and a fan, the wind duct is connected between the fan and the radiator, a sealing sponge strip is provided between the wind duct and the radiator, and the wind duct is used to guide the airflow generated by the fan to the radiator.

[0013] In some embodiments, the radiator includes a plurality of straight tubes, a plurality of U-shaped tubes and a plurality of fins, wherein the U-shaped tubes are connected between two adjacent straight tubes, and the fins are disposed on the straight tubes.

[0014] In some embodiments, an exhaust valve is provided on the radiator.

[0015] In some embodiments, the water-air heat dissipation assembly further includes a plurality of regulating valves, the regulating valves being arranged at the water inlet or outlet of the radiator, and the regulating valves being used to regulate the flow of the fluid in the radiator;

[0016] And / or, the water-to-air heat dissipation components are provided in plurality, and the plurality of water-to-air heat dissipation components are arranged side by side.

[0017] In some embodiments, the heat exchanger includes a metal substrate, a first flow channel and a second flow channel, the first flow channel and the second flow channel are arranged side by side on one side of the metal substrate, the fluid flow directions in the first flow channel and the second flow channel are opposite, trapezoidal teeth are provided in the first flow channel and the second flow channel, the tooth height of the trapezoidal teeth is 1.5mm-2.5mm, and the tooth spacing is 3mm-5mm, and the first flow channel and the second flow channel are coated with aluminum nitride ceramic coating.

[0018] In some embodiments, the water cooling circulation loop further comprises a filter, the filter is arranged on the pipeline between the circulation pump and the heat exchanger, and a stainless steel folded filter element is arranged in the filter;

[0019] And / or, the circulation pump is provided in plurality.

[0020] In addition, the combined frequency conversion equipment for the coal mine comprehensive mining working face provided in an embodiment of the present invention includes multiple frequency converters and the coal mine comprehensive mining working face frequency converter water cooling and heat dissipation system described in any of the above embodiments, and there are multiple heat exchangers, and the heat exchangers are arranged one by one with the frequency converters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a water cooling and heat dissipation system for a frequency converter of a fully mechanized mining face in a coal mine provided by an embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of a water tank in a water cooling and heat dissipation system of a frequency converter in a fully mechanized mining face of a coal mine provided by an embodiment of the present invention.

[0023] Figure 3 It is a structural schematic diagram of a heat exchanger in a water cooling and heat dissipation system of a frequency converter for a fully mechanized coal mining face provided by an embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the first flow channel in the heat exchanger in the water cooling and heat dissipation system of the inverter of the coal mine fully mechanized mining working face provided by one embodiment of the present invention.

[0025] Figure 5 It is a structural schematic diagram of a radiator in a water-cooling heat dissipation system for a frequency converter in a fully mechanized mining face of a coal mine provided by an embodiment of the present invention.

[0026] Figure 6 It is a structural schematic diagram of a water cooling and heat dissipation system for a frequency converter of a coal mine fully mechanized mining face provided by another embodiment of the present invention.

[0027] Reference numerals: 100, water cooling and heat dissipation system of inverter for fully mechanized mining working face in coal mine; 200, inverter;

[0028] 10. Water tank; 11. Main water tank; 111. Liquid level sensor; 12. Air compensator; 121. First channel; 122. Second channel; 123. One-way valve; 124. Air supply pump; 13. Water supply tank; 14. Water supply pump; 20. Circulation pump; 21. Switch valve; 30. Heat exchanger; 31. Metal substrate; 32. First flow channel; 321. Trapezoidal gear; 33. Second flow channel; 40. Water-air cooling assembly; 41. Radiator; 411. Straight pipe; 412. U-shaped pipe; 413. Fin; 42. Wind duct; 43. Fan; 44. Exhaust valve; 45. Control valve; 50. Temperature sensor; 60. Pressure sensor; 70. Filter. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a water cooling and heat dissipation system 100 for a frequency converter of a fully mechanized working face of a coal mine, which includes a water cooling circulation loop and a controller, wherein the water cooling circulation loop includes a water tank 10, a circulation pump 20, a heat exchanger 30 and a water-air heat dissipation component 40, wherein the water tank 10, the circulation pump 20, the heat exchanger 30 and the water-air heat dissipation component 40 are connected by a pipeline, and the heat exchanger 30 is arranged one-to-one with the frequency converter 200, and the heat exchanger 30 is fitted on the frequency converter. The water tank 10 includes a main water tank 11 and an air compensator 12, wherein a liquid level sensor 111 is arranged on the main water tank 11, and the air compensator 12 is arranged on the main water tank 11. The air compensator 12 includes a first channel 121 and a second channel 122. A one-way valve 123 is provided in the first channel 121, and the first channel 121 is used to discharge the gas in the main water tank 11; an air supply pump 124 is provided on the second channel 122, and the air supply pump 124, the liquid level sensor 111 and the controller are electrically connected. The air supply pump 124 is used to open or close according to the liquid level information collected by the liquid level sensor 111 to inject air into the main water tank 11.

[0031] Specifically, the water tank 10 is used as a water storage container for the water cooling circulation loop, and the liquid level sensor 111 can monitor the water level changes in the water tank in real time and convert the water level changes into electrical signals to send to the controller. The air compensator 12 adjusts the air volume in the water tank 10 to ensure that there is sufficient heat exchange medium in the circuit, and the heat exchange medium is water.

[0032] A one-way valve 123 is provided in the first channel 121 of the air compensator 12, and the one-way valve 123 only allows gas to be discharged from the main water tank 11 to the outside, and prevents external gas from flowing back in. In this way, when the system is running, the gas in the main water tank 11 can be discharged smoothly with the change of water temperature and the fluctuation of water level, avoiding the pressure problem that may be caused by the accumulation of gas in the system.

[0033] The second channel 122 of the air compensator 12 is provided with an air supply pump 124, which can be automatically turned on or off according to the liquid level information collected by the liquid level sensor 111 to inject an appropriate amount of air into the main water tank 11. That is, when the liquid level sensor 111 detects that the water level drops, it means that the amount of water in the water cooling circulation loop has decreased. At this time, the air supply pump 124 will start to add air to the water tank 10 to maintain the stability of the pressure and flow in the water cooling circulation loop. On the contrary, if the water level rises, the air supply pump 124 remains closed to prevent too much air from entering the water cooling circulation loop.

[0034] In summary, the water-cooling heat dissipation system 100 for the inverter of the coal mine fully mechanized working face provided by the present invention can adjust the air volume in the water tank 10 in real time through the air compensator 12, ensuring that there is sufficient heat exchange medium (water) in the water cooling circulation loop, thereby effectively absorbing and dissipating the heat generated by the inverter. This intelligent control system not only improves the heat dissipation efficiency, but also enhances the stability and reliability of the system, providing a strong guarantee for the long-term stable operation of the inverter.

[0035] In this embodiment, a temperature sensor 50 is also provided on the heat exchanger 30. The temperature sensor 50 and the circulation pump 20 are electrically connected to the controller. When the temperature sensor 50 detects that the temperature on the heat exchanger 30 exceeds a preset temperature threshold, the circulation pump 20 is started by the controller to accelerate the heat dissipation efficiency of the heat exchanger 30. The heat exchanger 30 can be set as a capillary tube or an expansion valve. The controller can include a PLC control module. It should be noted that the controller can be set separately or integrated in the water cooling circulation loop, and is no longer marked in the drawings of this application.

[0036] Optionally, the preset temperature threshold may be set to 40 degrees Celsius.

[0037] like Figure 3 and Figure 4As shown, in some embodiments, the heat exchanger 30 includes a metal substrate 31, a first flow channel 32 and a second flow channel 33, the first flow channel 32 and the second flow channel 33 are arranged side by side on one side of the metal substrate 31, the fluid flow directions in the first flow channel and the second flow channel are opposite, the first flow channel 32 and the second flow channel 33 are both provided with trapezoidal teeth 321, the tooth height of the trapezoidal teeth is 1.5mm-2.5mm, the tooth spacing is 3mm-5mm, and the first flow channel and the second flow channel are both coated with aluminum nitride ceramic coating.

[0038] Among them, the metal substrate 31, as the supporting structure of the entire heat exchanger, not only has excellent mechanical strength, but also has good thermal conductivity, and can quickly transfer heat from one side to the other. The first flow channel 32 and the second flow channel 33 are cleverly arranged side by side on one side of the metal substrate 31, so that the two fluids can flow in adjacent channels, thereby realizing heat exchange through the metal substrate 31. In addition, the flow directions of the fluids in the first flow channel 32 and the second flow channel 33 are opposite, and a countercurrent can be formed to improve the heat exchange efficiency. Because when the fluids flow in reverse, the temperature difference between the cold and hot fluids can be maintained at a large value on the entire heat exchange surface, thereby enhancing the driving force of heat transfer.

[0039] The trapezoidal teeth 321 can not only increase the surface area in the flow channel, so that the contact area between the fluid and the flow channel wall is increased, thereby increasing the rate of heat exchange; at the same time, the specific shape of the trapezoidal teeth can also guide the fluid to form turbulence, destroy the fluid boundary layer, and further promote the transfer of heat. Specifically, the tooth height of the trapezoidal teeth is controlled between 1.5mm and 2.5mm. Such a height can ensure sufficient surface area increase without excessively hindering the flow of the fluid. For example, the tooth height of the trapezoidal teeth can be set to 1.5mm, 1.8mm, 2mm, 2.5mm, etc. The tooth spacing is set between 3mm and 5mm. Such a spacing can ensure that the fluid channel between the trapezoidal teeth is unobstructed and can form an effective turbulent area. For example, the tooth spacing can be set to 3mm, 3.5mm, 3.8mm, 4mm, 5mm, etc. It should be noted that the tooth height and the tooth spacing can be set as required.

[0040] In addition, aluminum nitride ceramics have extremely high thermal conductivity and can quickly transfer heat from the fluid to the metal substrate 31, or from the metal substrate 31 to the fluid; at the same time, it also has excellent wear resistance and corrosion resistance, and can effectively resist the erosion of impurities and corrosive substances in the fluid, thereby protecting the inner wall of the flow channel from damage and extending the service life of the heat exchanger.

[0041] In some embodiments, Figure 5As shown, the radiator 41 includes a plurality of straight tubes 411, a plurality of U-shaped tubes 412 and a plurality of fins 413. The U-shaped tubes 412 are connected between two adjacent straight tubes 411, and the fins 413 are arranged on the straight tubes 411, forming an efficient and compact heat dissipation structure, which not only improves the heat dissipation efficiency of the radiator 41, but also enhances its structural strength and installation flexibility. In this embodiment, the straight tubes 411 and the U-shaped tubes 412 can be copper tubes, and the fins 413 can be aluminum alloy sheets.

[0042] Furthermore, an exhaust valve 44 is provided on the radiator 41, so that air or gas that may exist inside the radiator 41 can be removed. In the water-cooling circulation loop, due to the thermal expansion and contraction characteristics of water and possible leakage or water replenishment of the system, some air or gas will inevitably be mixed into the radiator 41. The presence of this air or gas will hinder the flow of the cooling medium (water), forming air resistance, thereby reducing the heat dissipation efficiency of the radiator 41. The exhaust valve 44 can conveniently discharge the air or gas inside the radiator 41 during the startup or operation of the system, ensuring that the cooling medium can flow smoothly and fully contact various parts of the radiator 41, thereby improving the heat dissipation efficiency.

[0043] Optionally, the exhaust valve 44 is disposed on the top of the radiator 41 .

[0044] like Figure 6 As shown, in some embodiments, the water tank 10 also includes a water replenishment tank 13 and a water replenishment pump 14. A water replenishment pipe is provided between the main water tank 11 and the water replenishment tank 13. The water replenishment pump 14 is provided on the water replenishment pipe. The water replenishment pump 14, the liquid level sensor 111 and the controller are electrically connected. The water replenishment pump 14 is used to open or close according to the information collected by the liquid level sensor 111 to inject water into the main water tank 11.

[0045] Among them, the water replenishment tank 13 is a part of the water tank 10, and the water replenishment tank 13 stores extra cooling medium (i.e., water) in case of emergency. When the water level in the main water tank 11 drops due to system operation, evaporation or leakage, the reserved water in the water replenishment tank 13 can be replenished in time to ensure the normal operation of the water cooling circulation loop. The water replenishment pipeline is a bridge connecting the main water tank 11 and the water replenishment tank 13, which allows water to flow freely between the two. The water replenishment pump 14 can control the flow direction and flow rate of water.

[0046] During the operation of the system, the liquid level sensor 111 constantly monitors the water level changes in the main water tank 11 and transmits this information to the controller in real time. The controller determines whether it is necessary to start the water replenishment pump 14 for water replenishment based on the received information. When the liquid level sensor 111 detects that the water level in the main water tank 11 is lower than the set value, the controller will immediately issue an instruction to start the water replenishment pump 14. The water replenishment pump 14 then starts working and pumps the water in the water replenishment tank 13 into the main water tank 11 through the water replenishment pipe until the water level returns to the normal range.

[0047] On the contrary, when the liquid level sensor 111 detects that the water level in the main water tank 11 is sufficient or too high, the controller will issue a stop command to turn off the water replenishment pump 14 to prevent excessive water from entering the system, causing waste or potential safety hazards.

[0048] Furthermore, the controller also includes a pressure sensor 60, which is arranged on the heat exchanger 30. The water supply pump 14 is used to start to inject water into the water injection tank when the pressure sensor 60 detects that the fluid pressure in the heat exchanger 30 is lower than the pressure threshold. The fluid pressure state inside the heat exchanger 30 directly affects the heat exchange efficiency and the stability of the system. If the pressure is too low, it may cause poor fluid flow and affect the heat exchange effect; if the pressure is too high, it may cause damage to the heat exchanger 30 or other system components.

[0049] The pressure sensor 60 can monitor the fluid pressure in the heat exchanger 30 in real time and transmit these data to the controller accurately and timely. The controller judges and analyzes the received pressure data according to the preset pressure threshold. When the pressure sensor 60 detects that the fluid pressure in the heat exchanger 30 is lower than the set pressure threshold, the controller will immediately respond and issue an instruction to start the water supply pump 14. The water supply pump 14 is then started to pump the water in the water supply tank 13 into the main water tank 11 through the water supply pipe, and then replenish it into the heat exchanger 30 to increase the fluid pressure inside it, which not only ensures that the fluid in the heat exchanger 30 can maintain sufficient pressure to ensure heat exchange efficiency, but also avoids system failure or damage that may be caused by too low pressure.

[0050] At the same time, the controller will intelligently adjust the flow rate and working time of the water replenishment pump 14 according to the actual operating status and needs of the system to ensure the accuracy and efficiency of the water replenishment process.

[0051] like Figure 1 and Figure 6 As shown, in some embodiments, the water-to-air heat dissipation assembly 40 also includes a radiator 41, a wind tube 42 and a fan 43. The wind tube 42 is connected between the fan 43 and the radiator 41. A sealing sponge strip is provided between the wind tube 42 and the radiator 41. The wind tube 42 is used to guide the airflow generated by the fan 43 to the radiator 41.

[0052] Specifically, the radiator 41 is responsible for transferring the heat in the water cooling loop to the airflow passing through its surface. The fan 43 is the power source of the water-air cooling assembly 40, and is responsible for generating a strong airflow. One end of the air cylinder 42 is connected to the fan 43, and the other end is tightly attached to the radiator 41, forming a closed airflow channel to accurately guide the airflow generated by the fan 43 to the radiator 41.

[0053] Furthermore, a sealing sponge strip is provided between the air duct 42 and the radiator 41 to enhance the sealing between the air duct 42 and the radiator 41 and prevent airflow leakage. It should be noted that the sealing sponge strip has good elasticity and sealing performance, and can tightly fill the tiny gap between the air duct 42 and the radiator 41, ensuring that the airflow can completely pass through the radiator 41 instead of leaking out from the gap, which not only improves the heat dissipation efficiency, but also reduces noise and energy consumption.

[0054] like Figure 6 As shown, in some embodiments, the water-air heat dissipation component 40 also includes a plurality of regulating valves 45, which are arranged at the water inlet or outlet of the radiator 41, and the regulating valves 45 are used to regulate the flow of the fluid in the radiator 41. The regulating valves 45 can accurately adjust the flow rate and flow velocity of the fluid in the radiator 41 according to the actual operating state and heat dissipation requirements of the system. When the system needs to enhance the heat dissipation effect, the regulating valves 45 can be opened wide to allow more fluid to pass through the radiator 41, thereby accelerating the transfer and dissipation of heat. On the contrary, when the system heat dissipation requirements are low, the regulating valves 45 can be closed or even completely closed to reduce the flow of the fluid, thereby reducing energy consumption.

[0055] Furthermore, there are multiple water-to-air heat dissipation components 40, and multiple water-to-air heat dissipation components 40 are arranged side by side. The regulating valve 45 is also electrically connected to the controller, and the flexible switching of different radiators 41 can be achieved by selectively opening or closing the regulating valve 45. There are multiple radiators 41 in the system, which may be located in different positions or have different heat dissipation capabilities and efficiencies. According to actual heat dissipation requirements and energy consumption considerations, the controller can intelligently select which radiators 41 to open and which radiators 41 to close to achieve the best heat dissipation effect and energy consumption balance. In this embodiment, there are two water-to-air heat dissipation components 40.

[0056] In some embodiments, the water cooling circulation loop further includes a filter 70, which is disposed on the pipeline between the circulation pump 20 and the heat exchanger 30. The filter 70 is provided with a stainless steel folded filter element, so that impurities, particles and suspended matter in the circulating water can be filtered out to ensure the cleanliness of the water quality, thereby protecting the circulation pump 20, the heat exchanger 30 and other components from being damaged by impurities, extending their service life, and improving the heat dissipation efficiency of the system.

[0057] In some embodiments, there are multiple circulating pumps 20. In this embodiment, there are two circulating pumps 20, and the inlet and outlet of the circulating pump 20 are both provided with switch valves 21, which means that one pump can be selected to run alone or two pumps can be run at the same time according to the actual situation. When the heat dissipation demand is low, or in order to save energy consumption, only one circulating pump 20 can be selected to run, which can not only meet the basic heat dissipation demand, but also effectively reduce energy consumption. When the heat dissipation demand is high, or the inverter temperature needs to be quickly reduced, two circulating pumps 20 can be run at the same time to increase the circulating water flow rate and improve the heat dissipation efficiency.

[0058] In addition, the coal mine comprehensive mining working face inverter water cooling and heat dissipation system 100 provided in an embodiment of the present invention also includes a compressor module, which can provide cooling capacity for the cooling medium (ie, water) in the water cooling circulation loop, thereby realizing rapid cooling of the cooling medium and thereby improving the cooling efficiency of the inverter.

[0059] In addition, an embodiment of the present invention also provides a combined frequency conversion device for a coal mine comprehensive mining working face, which includes multiple frequency converters 200 and a coal mine comprehensive mining working face frequency converter water cooling and heat dissipation system 100 provided in any of the above embodiments, and multiple heat exchangers 30 are provided, and the heat exchangers 30 and frequency converters 200 are arranged one by one.

[0060] Furthermore, the inverter 200 includes a box and a plurality of heat sinks, the plurality of heat sinks are equidistantly arranged on the inner wall of the box, the inner surface of the box is coated with heat dissipation paste, and the heat dissipation paste includes thermal conductive silicone grease and metal oxide.

[0061] It should be noted that the combined frequency conversion equipment for the coal mine comprehensive mining working face provided in the embodiment of the present application has the same implementation principle and technical effects as the aforementioned embodiment of the water cooling and heat dissipation system for the frequency converter of the coal mine comprehensive mining working face. For the sake of brief description, for matters not mentioned in the embodiment of the combined frequency conversion equipment for the coal mine comprehensive mining working face, reference may be made to the corresponding contents in the aforementioned embodiment of the water cooling and heat dissipation system for the frequency converter of the coal mine comprehensive mining working face.

[0062] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the present invention, the terms "one embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water cooling and heat dissipation system for inverters in coal mine fully mechanized working faces, characterized in that: It includes a water-cooling circulation loop and a controller. The water-cooling circulation loop includes a water tank, a circulation pump, a heat exchanger and a water-to-air heat dissipation component. The water tank, the circulation pump, the heat exchanger and the water-to-air heat dissipation component are connected by pipelines. The heat exchanger is arranged in a one-to-one correspondence with the frequency converter. The heat exchanger is fitted on the frequency converter. The water tank includes a main water tank and an air compensator. A liquid level sensor is provided on the main water tank. The air compensator is provided on the main water tank. The air compensator includes a first channel and a second channel. A one-way valve is provided in the first channel. The first channel is used to discharge the gas in the main water tank; an air supply pump is provided on the second channel. The air supply pump, the liquid level sensor and the controller are electrically connected. The air supply pump is used to open or close according to the liquid level information collected by the liquid level sensor to inject air into the main water tank.

2. The water cooling and heat dissipation system for inverter of coal mine fully mechanized mining working face according to claim 1 is characterized in that: The water tank also includes a water replenishment tank and a water replenishment pump. A water replenishment pipe is provided between the main water tank and the water replenishment tank. The water replenishment pump is arranged on the water replenishment pipe. The water replenishment pump, the liquid level sensor and the controller are electrically connected. The water replenishment pump is used to open or close according to the liquid level information collected by the liquid level sensor to fill water into the main water tank.

3. The water cooling and heat dissipation system for inverter of coal mine fully mechanized mining working face according to claim 2 is characterized in that: The controller further comprises a pressure sensor, which is arranged on the heat exchanger. The water replenishment pump is used to start filling water into the main water tank when the pressure sensor detects that the fluid pressure in the heat exchanger is lower than a pressure threshold.

4. The water cooling and heat dissipation system for inverter of coal mine fully mechanized mining working face according to claim 1 is characterized in that: The water-air heat dissipation component also includes a radiator, a wind tube and a fan. The wind tube is connected between the fan and the radiator. A sealing sponge strip is provided between the wind tube and the radiator. The wind tube is used to guide the airflow generated by the fan to the radiator.

5. The water cooling and heat dissipation system for inverter of coal mine fully mechanized mining working face according to claim 4 is characterized in that: The radiator comprises a plurality of straight tubes, a plurality of U-shaped tubes and a plurality of fins. The U-shaped tubes are connected between two adjacent straight tubes, and the fins are arranged on the straight tubes.

6. The water cooling and heat dissipation system for inverters in coal mine fully mechanized working faces according to claim 4 is characterized in that: The radiator is provided with an exhaust valve.

7. The water cooling and heat dissipation system for inverters in coal mine fully mechanized working faces according to claim 4 is characterized in that: The water-air heat dissipation component further includes a plurality of regulating valves, each of which is disposed at a water inlet or a water outlet of the radiator and is used to regulate the flow of the fluid in the radiator; And / or, the water-to-air heat dissipation components are provided in plurality, and the plurality of water-to-air heat dissipation components are arranged side by side.

8. The water cooling and heat dissipation system for inverters in coal mine fully mechanized working faces according to claim 1 is characterized in that: The heat exchanger includes a metal substrate, a first flow channel and a second flow channel, wherein the first flow channel and the second flow channel are arranged side by side on one side of the metal substrate, and the fluid flow directions in the first flow channel and the second flow channel are opposite, and the first flow channel and the second flow channel are both provided with trapezoidal teeth, the tooth height of the trapezoidal teeth is 1.5mm-2.5mm, and the tooth spacing is 3mm-5mm, and the first flow channel and the second flow channel are both coated with aluminum nitride ceramic coating.

9. The water cooling and heat dissipation system for frequency converter of coal mine fully mechanized mining working face according to claim 1 is characterized in that: The water cooling circulation loop also includes a filter, which is arranged on the pipeline between the circulation pump and the heat exchanger, and a stainless steel folded filter element is arranged in the filter; And / or, the circulation pump is provided in plurality.

10. A combined frequency conversion device for fully mechanized coal mining working face, characterized in that: The invention comprises a plurality of frequency converters and a water-cooling heat dissipation system for frequency converters of a coal mine comprehensive mining working face as described in any one of claims 1 to 9, wherein a plurality of heat exchangers are provided, and the heat exchangers are arranged one-to-one with the frequency converters. The frequency converter comprises a housing and a plurality of heat sinks, and the plurality of heat sinks are equidistantly arranged on the inner wall of the housing. The inner surface of the housing is coated with heat dissipation paste, and the heat dissipation paste comprises thermal grease and metal oxide.

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