Anti-blocking heat dissipation structure of variable frequency driving device in high-dust environment

Abstract

The invention relates to the technical field of frequency converters, in particular to an anti-blocking heat dissipation structure of a variable frequency driving device in a high-dust environment, which comprises a main shell, a heat dissipation box fixed at the bottom of the main shell, air ports formed in two sides of the heat dissipation box, heat dissipation fins uniformly distributed in the main shell and a fan module arranged in the heat dissipation box, first flow deflectors are arranged on one side in the heat dissipation box at intervals, second flow deflectors are arranged on the other side in the heat dissipation box at intervals, and the first flow deflectors and the second flow deflectors are alternately distributed in a staggered mode so that an S-shaped cavity channel connected with the two air openings can be formed in the heat dissipation box. The positions of the first flow deflector and the second flow deflector are periodically changed through the driving mechanism, switching of the flow direction of heat dissipation airflow is achieved, the original air inlet side is switched to the air outlet side, a filter screen on the original air inlet side can be automatically back-blown and cleaned through the reversed airflow, the risks that due to blockage of filter holes, wind resistance is increased, and heat dissipation fails are reduced, and the heat dissipation efficiency is improved. The frequency of manual cleaning is reduced, and the self-maintaining capability of the frequency converter in a high-dust environment is improved.

Description

Technical Field

[0001] This invention relates to the field of frequency converter technology, specifically to an anti-clogging heat dissipation structure for frequency converter drive devices in high-dust environments. Background Technology

[0002] A frequency converter is a variable frequency drive device, which is the core control equipment of modern industrial motors. It has been widely used in speed regulation and energy-saving control of various loads such as fan modules, pumps, compressors and conveyor belts. Its internal core power devices (such as IGBT modules) generate a lot of heat when working. Effective heat dissipation design is the key to ensuring the stable and reliable operation of the frequency converter drive device.

[0003] In well-ventilated computer rooms, forced air cooling (using cooling fans) or air conditioning recirculation is usually sufficient to meet heat dissipation needs. However, in many heavy industrial sectors, such as mining, cement production, and metallurgical coking, the air is filled with high concentrations of mineral dust, coal dust, and metal particles. To protect sensitive electronic equipment in such harsh environments, variable frequency drives are typically installed in fully enclosed protective cabinets. However, this enclosed environment hinders natural convection cooling, necessitating forced ventilation. Once vents are opened to introduce outside air for cooling, dust particles enter and quickly clog the cooling channels, adhering to the surface of the radiator fins and forming a thick layer of insulating dust, degrading heat dissipation efficiency and requiring frequent maintenance and cleaning. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-clogging heat dissipation structure for frequency converter drives in high-dust environments, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] A clog-resistant heat dissipation structure for a variable frequency drive device in a high-dust environment includes a main housing, a heat sink box fixed to the bottom of the main housing, air vents on both sides of the heat sink box, heat dissipation fins evenly distributed within the main housing, and a fan module within the heat sink box. A first guide vane is spaced apart on one side of the heat sink box, and a second guide vane is spaced apart on the other side, with the first and second guide vanes alternately staggered. An S-shaped cavity connecting to the two air vents is formed within the heat sink box through the first and second guide vanes. The fan module is fixed in the middle of the heat sink box to generate cooling airflow within the S-shaped cavity. A drive mechanism is provided within the heat sink box to drive the first and second guide vanes to move in opposite directions along the width of the heat sink box. The heat dissipation fins are spaced apart within the main housing along the length of the heat sink box, and all heat dissipation fins extend through the heat sink box. Filters are installed in both air vents.

[0007] Preferably, a cavity is formed between two adjacent heat dissipation fins inside the heat dissipation box; the cavity extends along the width direction of the heat dissipation box; the first guide plate and the second guide plate are respectively slidably limited and installed in the corresponding cavity.

[0008] Preferably, the drive mechanism includes a bidirectional threaded rod, a pair of nut seats, and a pair of fixed rods; the bidirectional threaded rod is rotatably mounted inside the heat sink and extends along the width direction of the heat sink; the two nut seats are symmetrically fitted on both sides of the bidirectional threaded rod and are threadedly connected to the threaded portions on both sides of the bidirectional threaded rod respectively; the fixed rods are fixed below the corresponding nut seats, and both fixed rods extend along the length direction of the heat sink; one fixed rod passes through all the first guide vanes and is fixedly connected to each of the first guide vanes, and the other fixed rod passes through all the second guide vanes and is fixedly connected to each of the second guide vanes; a drive device is provided on the outside of the heat sink, and the drive device is used to drive the bidirectional threaded rod to rotate.

[0009] Preferably, the driving device is a drive motor, which is fixed to the side of the heat sink box; the output shaft of the drive motor is fixedly connected to one end of the bidirectional threaded rod.

[0010] Preferably, both the first guide vane and the second guide vane are provided with relief grooves at their ends; the relief grooves are used to accommodate the fixing rods on the opposite side.

[0011] Preferably, a temperature sensor is fixedly installed on one side of the main housing, and the detection part of the temperature sensor is located inside the main housing; the temperature sensor is used to collect the temperature inside the main housing in real time and feed the data back to the control unit.

[0012] Preferably, differential pressure sensors are installed on both sides of the heat dissipation box. The differential pressure sensors have a first detection end and a second detection end. The first detection end is arranged on the inner side of the filter screen, and the second detection end is arranged on the outer side of the filter screen on the same side. The differential pressure sensors are used to detect the pressure difference between the inner and outer sides of the filter screen and feed the data back to the control unit.

[0013] Preferably, a sliding rod extending along the length of the heat sink box is fixed on the first guide vane closest to one side of the air vent and the second guide vane closest to the other side of the air vent; both sliding rods slide to the outside of the heat sink box, and a connecting arm is fixed to the end of each sliding rod outside the heat sink box; a mounting arm is fixed to the end of each connecting arm, and the mounting arm extends along the width of the heat sink box; a scraper is installed on the end of each mounting arm for scraping and cleaning the filter screen on the same side.

[0014] Preferably, the portion of the heat dissipation fins within the main housing is integrally formed with a fitting cavity for accommodating the heat-generating component.

[0015] Preferably, one end of the first guide vane is defined as end a and the other end as end b; one end of the second guide vane is defined as end c and the other end as end d; one long side inner wall of the heat sink is defined as surface A and the other long side inner wall is defined as surface B; one side air vent is defined as the first flow port and the other side air vent is defined as the second flow port.

[0016] The following are methods to prevent heat dissipation blockage:

[0017] Operating Condition 1: The drive mechanism drives the first guide vane and the second guide vane to move away from each other to their limit, with each end a a contacting surface A and each end c contacting surface B, forming a first S-shaped heat dissipation channel. A heat dissipation airflow A is formed inside the heat dissipation box, flowing sequentially through the first flow port, the first S-shaped heat dissipation channel, and the second flow port.

[0018] Operating Condition 2: The drive mechanism drives the first and second guide vanes to approach each other to their limit, with each b end abutting against surface B and each d end abutting against surface A, forming a second S-shaped heat dissipation channel. A heat dissipation airflow B is formed inside the heat dissipation box, flowing sequentially through the second flow port, the second S-shaped heat dissipation channel, and the first flow port.

[0019] The cooling airflow A and cooling airflow B flow in opposite directions, and periodically repeat working conditions one and two, which can alternately backflush and clean the filters on both sides to prevent clogging.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0021] This invention achieves the switching of the airflow direction for heat dissipation by periodically changing the positions of the first and second guide vanes through a drive mechanism, thus switching the original air inlet side to the air outlet side. The reversed airflow can automatically backflush and clean the filter on the original air inlet side, reducing the risk of increased air resistance and heat dissipation failure due to filter blockage, reducing the frequency of manual cleaning, and improving the self-sustaining capability of the frequency converter in high dust environments.

[0022] This invention embeds the heat-generating component onto the heat dissipation fins, allowing the heat-generating part to directly contact the heat dissipation fins. At the same time, by using the alternating staggered arrangement of the first and second guide vanes to form an S-shaped cavity in the heat dissipation box, the cooling air is forced to flow along an extended path, increasing the effective contact time and contact area between the airflow and the heat dissipation fins, enhancing the convective heat transfer phenomenon, and enabling the heat generated by the heat-generating component to be carried away more fully, thereby improving the heat dissipation efficiency of the frequency converter.

[0023] This invention integrates a temperature sensor, a differential pressure sensor, and a controller. The controller can dynamically adjust the speed of the fan module to adapt to load changes, accurately determine the degree of filter clogging, and automatically trigger airflow reversal to backflush and clean the filter, effectively improving the automation and reliability of the inverter's heat dissipation system.

[0024] This invention links scrapers on the first and second guide vanes at the end, so that when the guide vanes switch positions, the scrapers can be driven to move along the outer surface of the filter screen synchronously. The mechanical scraping can break up the caked dust layer, and form a synergistic effect with the reverse airflow blowing, which improves the cleaning effect on highly adhesive dust and solves the problem that single backflushing may not clean thoroughly.

[0025] The heat dissipation fins in this invention not only undertake the core heat conduction function, but the cavity formed between two adjacent heat dissipation fins also cleverly provides a sliding limit effect for the first or second guide fin, simplifying the installation and guiding structure of the guide fins. The first or second guide fin is fixed in series by a fixing rod, and the synchronous reverse movement of multiple guide fins is realized with a single power source. The scraper and the guide fins are linked, so that multiple functions are highly integrated inside and outside the heat dissipation box. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0027] Figure 2 for Figure 1 Another perspective view of the structure shown;

[0028] Figure 3 This is a schematic diagram of a partial internal structure of the main housing in this invention;

[0029] Figure 4 A schematic diagram of the interlocking cavity structure on the heat sink fins;

[0030] Figure 5 This is a schematic diagram of a partial internal structure of the heat sink box in this invention;

[0031] Figure 6 for Figure 5 A partial cross-sectional schematic diagram of the structure shown;

[0032] Figure 7 A schematic diagram of the installation structure of one side scraper;

[0033] Figure 8 A schematic diagram of the structural installation of the scraper on the other side;

[0034] Figure 9 This is a schematic diagram of the airflow direction within the first S-shaped heat dissipation channel;

[0035] Figure 10 This is a schematic diagram of the airflow direction within the second S-shaped heat dissipation channel;

[0036] Figure 11 This is a system block diagram illustrating the control principle in this invention.

[0037] In the diagram: 01, clearance groove; 02, first S-shaped heat dissipation channel; 03, second S-shaped heat dissipation channel; 04, surface A; 05, surface B; 06, first flow port; 07, second flow port; 1, main housing; 11, temperature sensor; 2, heat sink box; 21, air outlet; 22, filter screen; 23, slide bar; 24, connecting arm; 25, mounting arm; 26, scraper; 3, first guide vane; 301, end a; 302, end b; 4, second guide vane; 401, end c; 402, end d; 5, drive mechanism; 51, drive motor; 52, bidirectional threaded rod; 53, nut seat; 54, fixing rod; 6, heat dissipation fins; 61, clamping cavity; 7, differential pressure sensor; 71, first detection end; 72, second detection end; 8, fan module. Detailed Implementation

[0038] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly, wherein "fixed" means that the devices or elements are connected to each other and their relative positional relationship remains unchanged after connection. The directional terms mentioned in the embodiments of the present invention are only for reference to the directions in the accompanying drawings, and are intended to better and more clearly illustrate and understand the embodiments of the present invention. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limitations on the embodiments of the present invention.

[0040] Example 1

[0041] Please see Figures 1-11 The present invention provides an anti-clogging heat dissipation structure for a variable frequency drive device in a high dust environment, including a main housing 1, a heat dissipation box 2 fixed to the bottom of the main housing 1, air vents 21 on both sides of the heat dissipation box 2, heat dissipation fins 6 evenly distributed in the main housing 1, and a fan module 8 in the heat dissipation box 2.

[0042] The main housing 1 houses core modules such as a rectifier module, a DC bus capacitor, an inverter module, and a control circuit. The rectifier module converts the input AC power into DC power, which is then filtered and stored by the DC bus capacitor. Under the control of the PWM signal of the control circuit, the power semiconductor in the inverter module inverts the DC power into AC power with adjustable frequency and voltage. The specific structure and working principle of the above modules are consistent with the prior art and will not be described in detail in this application.

[0043] Heat dissipation fins 6 are fixed at intervals within the main housing 1 along the length of the heat dissipation box 2, and all heat dissipation fins 6 extend through into the heat dissipation box 2. Filters 22 are installed in both air vents 21. First guide vanes 3 are arranged at intervals on one side of the heat dissipation box 2, and second guide vanes 4 are arranged at intervals on the other side. The first guide vanes 3 and second guide vanes 4 are alternately staggered, that is, a second guide vane 4 is provided between two adjacent first guide vanes 3. An S-shaped cavity is formed in the heat dissipation box 2 through the first guide vanes 3 and the second guide vanes 4, which connects with the two air vents 21. The S-shaped cavity is used for the flow of heat dissipation airflow. The fan module 8 is fixed in the middle of the heat dissipation box 2 to form heat dissipation airflow in the S-shaped cavity. A drive mechanism 5 is provided in the heat dissipation box 2 to drive the first guide vanes 3 and the second guide vanes 4 to move in opposite directions in the width direction of the heat dissipation box 2.

[0044] The portion of the heat dissipation fins 6 within the main housing 1 is integrally formed and has multiple fitting cavities, such as... Figure 3 and Figure 4 As shown, two of the fitting cavities are rectangular, and the other fitting cavity is L-shaped. The rectifier module, inverter module, and DC bus capacitor and other components generate heat during operation. During assembly, the aforementioned heat-generating components are fitted into the fitting cavity formed by the heat dissipation fins 6, so that the heat-generating parts are in direct contact with the heat dissipation fins 6, ensuring that the heat generated by the inverter can be directly transferred to the heat dissipation box 2 through the heat dissipation fins 6.

[0045] like Figure 9 and Figure 10 As shown, one end of the first guide vane 3 is defined as end a 301, and the other end is defined as end b 302; one end of the second guide vane 4 is defined as end c 401, and the other end is defined as end d 402; one long side inner wall of the heat sink 2 is defined as surface A 04, and the other long side inner wall is defined as surface B 05; one side air vent 21 is defined as the first flow port 06, and the other side air vent 21 is defined as the second flow port 07.

[0046] Operating condition 1: The drive mechanism 5 operates, driving the first guide vane 3 and the second guide vane 4 to move away from each other to their extreme states, such as... Figure 9 As shown, each a-end 301 is in contact with surface A 04, and each b-end 302 has a gap between it and surface B 05 for airflow. Similarly, each c-end 401 is in contact with surface B 05, and each d-end 402 has a gap between it and surface A 04 for airflow. Under the guidance of the first guide vane 3 and the second guide vane 4, a first S-shaped heat dissipation channel 02 is formed inside the heat sink 2. When the fan module 8 operates, it draws external air into the heat sink 2 through the first flow port 06, forming a heat dissipation airflow A that flows sequentially through the first flow port 06, the first S-shaped heat dissipation channel 02, and the second flow port 07 (flow direction is...). Figure 9(As shown by the dashed arrow in the image), the heat generated by the heating element is transferred to the heat dissipation fins 6. The part of the heat dissipation fins 6 inside the heat dissipation box 2 exchanges heat with the heat dissipation airflow A. Finally, the heat dissipation airflow A carries the heat and is discharged from the second flow port 07, thus achieving the heat dissipation function.

[0047] During the heat dissipation process, the air entering the heat dissipation box 2 is filtered by the filter screen 22 on the same side as the first flow port 06, which intercepts dust and particulate impurities in the air and prevents dust and particulate impurities from entering the heat dissipation box 2 and causing channel blockage. In addition, the heat dissipation airflow A flows out from the second flow port 07, which can prevent dust and particulate impurities from entering the heat dissipation box 2 from this side.

[0048] Operating Condition 2: The drive mechanism 5 operates, driving the first guide vane 3 and the second guide vane 4 to approach each other to their limit state, such as... Figure 10 As shown, each b end 302 is in contact with surface B 05, each a end 301 has a gap with surface A 04, each d end 402 is in contact with surface A 04, and each c end 401 has a gap with surface B 05. Thus, a second S-shaped heat dissipation channel 03 is formed inside the heat sink 2. When the fan module 8 is working, external air is drawn into the heat sink 2 through the second flow port 07, forming a heat dissipation airflow B that flows sequentially through the second flow port 07, the second S-shaped heat dissipation channel 03, and the first flow port 06 (flow direction as shown). Figure 10 (as shown by the dashed arrow in the image).

[0049] Similarly, the heat generated by the heat-generating component is transferred to the heat dissipation fins 6. The portion of the heat dissipation fins 6 inside the heat dissipation box 2 undergoes convective heat exchange with the heat dissipation airflow B. Finally, the heat dissipation airflow B carries the heat and is discharged from the first flow port 06, thus achieving the heat dissipation function.

[0050] During the heat dissipation process, the air entering the heat dissipation box 2 is filtered by the filter screen 22 on the same side as the second flow port 07, which intercepts dust and particulate impurities in the air and prevents dust and particulate impurities from entering the heat dissipation box 2 and causing channel blockage. In addition, the heat dissipation airflow B flows out from the first flow port 06, which can prevent dust and particulate impurities from entering the heat dissipation box 2 from that side.

[0051] The aforementioned heat dissipation airflows A and B flow in opposite directions. By periodically repeating working conditions one and two, reverse heat dissipation airflows are formed, thereby alternately backflushing and cleaning the filter screens 22 on both sides, preventing the filter screens 22 from being clogged by impurities during long-term filtration and affecting the normal flow of air.

[0052] By periodically changing the position of the first guide vane 3 and the second guide vane 4 through the drive mechanism 5, the direction of the heat dissipation airflow is switched, and the original air inlet side is switched to the air outlet side. The airflow after the reversal can automatically back-blow and clean the filter screen 22 on the original air inlet side, reducing the risk of increased air resistance and heat dissipation failure caused by filter clogging, and reducing the frequency of manual cleaning.

[0053] In addition, by using the first guide vane 3 and the second guide vane 4 to form an S-shaped cavity in the heat dissipation box 2, the flow time of the airflow in the heat dissipation box 2 can be extended, ensuring that the heat dissipation airflow and the heat dissipation fins 6 convective heat exchange is more thorough, and further improving the heat dissipation effect.

[0054] Example 2

[0055] Please see Figure 2 , Figure 5 and Figure 9 Based on Embodiment 1, this embodiment provides a detailed explanation of the drive mechanism 5, as follows:

[0056] The drive mechanism 5 includes a bidirectional threaded rod 52, a pair of nut seats 53, and a pair of fixing rods 54. The bidirectional threaded rod 52 is rotatably installed inside the heat sink 2 and extends along the width direction of the heat sink 2. The two nut seats 53 are symmetrically fitted on both sides of the bidirectional threaded rod 52 and are threadedly connected to the threaded portions on both sides of the bidirectional threaded rod 52, respectively. The fixing rods 54 are fixed below the corresponding nut seats 53, and both fixing rods 54 extend along the length direction of the heat sink 2. One fixing rod 54 passes through all the first guide vanes 3 and is fixedly connected to each of the first guide vanes 3. The other fixing rod 54 passes through all the second guide vanes 4 and is fixedly connected to each of the second guide vanes 4. A drive device is provided on the outside of the heat sink 2, and the drive device is used to drive the bidirectional threaded rod 52 to rotate.

[0057] The drive device uses a drive motor 51, which is fixed to the side of the heat sink 2. The output shaft of the drive motor 51 is fixedly connected to one end of the bidirectional threaded rod 52.

[0058] The bidirectional threaded rod 52 is driven to rotate forward by the drive motor 51. The forward rotation of the bidirectional threaded rod 52 can drive the two nut seats 53 to move away from each other. Under the connection of the fixed rods 54 on both sides, it drives the first guide vane 3 and the second guide vane 4 to move away from each other. The bidirectional threaded rod 52 is driven to rotate in reverse by the drive motor 51. Similarly, it can drive the first guide vane 3 and the second guide vane 4 to move closer to each other, thereby providing a stable drive for the position adjustment of the first guide vane 3 and the second guide vane 4.

[0059] The first guide vane 3 and the second guide vane 4 are both provided with relief grooves 01 at their ends. The relief grooves 01 are used to match and accommodate the fixed rod 54 on the opposite side. The relief grooves 01 can make room for the fixed rod 54 on the opposite side, so as to avoid obstruction and interference when the first guide vane 3 and the second guide vane 4 are close to each other.

[0060] Example 3

[0061] Please see Figure 6 The difference between this embodiment and Embodiment 2 is that:

[0062] Inside the heat sink 2, a cavity 61 is formed between two adjacent heat sink fins 6. The cavity 61 extends along the width direction of the heat sink 2. The first guide vane 3 and the second guide vane 4 are respectively slidably limited and installed in the corresponding cavity 61.

[0063] The first guide vane 3 and the second guide vane 4 are installed in the cavity 61 formed by the two heat dissipation fins 6. The two adjacent heat dissipation fins 6 provide a limiting and guiding effect for the first guide vane 3 and the second guide vane 4, ensuring that the first guide vane 3 and the second guide vane 4 will not deflect when the drive motor 51 is working, thereby improving the stability of the movement adjustment of the first guide vane 3 and the second guide vane 4.

[0064] In addition, the portion of the two heat dissipation fins 6 inside the heat dissipation box 2 forms a channel for the flow of heat dissipation air, increasing the heat dissipation area. The heat dissipation fins 6 not only serve as heat conductors for heat transfer, but also as limiting components for the installation of the first guide plate 3 and the second guide plate 4, achieving two goals at once.

[0065] Example 4

[0066] Please see Figure 3 and Figure 6 The difference between this embodiment and Embodiment 3 is as follows:

[0067] Both the drive motor 51 and the fan module 8 are controlled by the control unit (not shown in the figure); a temperature sensor 11 is fixedly installed on one side of the main housing 1. The detection part of the temperature sensor 11 is located inside the main housing 1. The temperature sensor 11 is used to collect the temperature inside the main housing 1 in real time and feed the data back to the control unit; differential pressure sensors 7 are installed on both sides inside the heat sink 2. The differential pressure sensor 7 has a first detection end 71 and a second detection end 72. The first detection end 71 is arranged inside the filter screen 22, and the second detection end 72 is arranged outside the filter screen 22 on the same side. The differential pressure sensor 7 is used to detect the pressure difference between the inside and outside of the filter screen 22 and feed the data back to the control unit.

[0068] The differential pressure sensor 7 can measure the pressure difference on both sides of the filter screen 22 in real time. When the filter screen 22 is clean, the pressure difference on both sides is very small. As dust, i.e. particulate impurities, accumulates on the outside of the filter screen 22, the resistance to air passage increases, and the pressure difference rises linearly. It can be seen that the pressure difference is a direct and reliable indicator of the degree of clogging of the filter screen 22. The control unit is a controller integrated in the main housing 1, which can continuously monitor the pressure difference signal transmitted by the differential pressure sensor 7 and the temperature signal from the temperature sensor 11.

[0069] The controller's built-in control logic is as follows:

[0070] When the frequency converter is working, the controller receives the operating signal of the frequency converter or the temperature rise signal of the temperature sensor 11, and controls the fan module 8 to work to achieve cooling. At the same time, the differential pressure sensor 7 on the air inlet side works, while the differential pressure sensor 7 on the air outlet side does not work. The controller compares the pressure difference on both sides of the filter 22 on the air inlet side with the preset cleaning trigger threshold in real time.

[0071] When the temperature sensor 11 reports that the temperature inside the main housing 1 continues to rise, and at the same time the pressure difference between the two sides of the air inlet filter 22 is less than the cleaning trigger threshold, the controller controls the fan module 8 to increase its speed so that the speed of the fan module 8 matches the temperature inside the main housing 1 in order to maintain normal heat dissipation.

[0072] When the controller analyzes that the pressure values ​​on both sides of the inlet side filter 22 are greater than the cleaning trigger threshold, the controller determines that the inlet side filter 22 is blocked and affects normal ventilation, and needs to be cleaned. The controller outputs a signal to control the drive motor 51 to move and adjust the first guide vane 3 and the second guide vane 4 to switch the direction of the heat dissipation airflow, so that the side where the blocked filter 22 is located becomes the air outlet side. At the same time, the differential pressure sensor 7 on the original air outlet side is controlled to work, and the differential pressure sensor 7 on the original air inlet side is not working. The heat dissipation airflow after the reversal flows normally, and the components in the main housing 1 are cooled normally. At the same time, the heat dissipation airflow is used to backflush and clean the blocked filter 22.

[0073] By monitoring the pressure difference between the inner and outer sides of the corresponding side filter 22, the heat dissipation airflow is adaptively controlled to periodically change direction, thereby achieving back-blowing self-cleaning of the two side filters 22, ensuring long-term reliable operation of the heat dissipation system and reducing the frequency of manual cleaning and maintenance.

[0074] Example 5

[0075] Please see Figure 7 and Figure 8 The difference between this embodiment and embodiment 4 is that:

[0076] A sliding rod 23 extending along the length of the heat sink 2 is fixed on the first guide vane 3 closest to one side air outlet 21 and the second guide vane 4 closest to the other side air outlet 21. Both sliding rods 23 extend slidably to the outside of the heat sink 2. A connecting arm 24 is fixed on the end of the two sliding rods 23 located outside the heat sink 2. An mounting arm 25 is fixed on the end of the two connecting arms 24. The mounting arm 25 extends along the width of the heat sink 2. A scraper 26 is installed on the end of the two mounting arms 25 for scraping and cleaning the filter screen 22 on the same side.

[0077] Two scrapers 26 are evenly distributed with bristles (not shown in the figure) on the side near the filter screen 22. When the first guide vane 3 and the second guide vane 4 are moved and adjusted, the scrapers 26 can be driven to move synchronously along the width direction of the heat sink box 2 under the connection of the slide rod 23, the connecting arm 24 and the mounting arm 25, so as to achieve scraping and cleaning of the outside of the filter screen 22. This can break up the dirt clumps on the outside of the filter screen 22 and cooperate with the back-blowing airflow to improve the cleaning effect on the air inlet side filter screen 22, and prevent dirt from clumping on the outside of the filter screen 22 and making it difficult to clean. Moreover, the scrapers 26 move synchronously with the first guide vane 3 and the second guide vane 4, without the need to set up an additional drive source, reducing the drive cost while ensuring precise matching of the timing of scraping and cleaning and airflow switching.

[0078] Furthermore, when the scraper 26 moves and scrapes, the bristles come into contact with the second detection end 72. Since the bristles are made of soft material, they will not cause damage to the second detection end 72.

[0079] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A blockage-resistant heat dissipation structure for a variable frequency drive device in a high-dust environment, comprising a main housing (1), a heat dissipation box (2) fixed to the bottom of the main housing (1), air vents (21) on both sides of the heat dissipation box (2), heat dissipation fins (6) evenly distributed in the main housing (1), and a fan module (8) disposed in the heat dissipation box (2), characterized in that: The heat sink (2) has a first guide vane (3) arranged at intervals on one side and a second guide vane (4) arranged at intervals on the other side, and the first guide vane (3) and the second guide vane (4) are alternately staggered. The heat dissipation box (2) forms an S-shaped cavity that connects with the two air outlets (21) through the first guide plate (3) and the second guide plate (4); The fan module (8) is fixed in the middle of the heat dissipation box (2) to form a heat dissipation airflow in the S-shaped cavity; The heat sink (2) is provided with a drive mechanism (5) for driving the first guide vane (3) and the second guide vane (4) to move in opposite directions in the width direction of the heat sink (2); The heat dissipation fins (6) are fixed in the main housing (1) at intervals along the length of the heat dissipation box (2), and the heat dissipation fins (6) all extend through into the heat dissipation box (2); Both air vents (21) are equipped with filters (22).

2. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 1, characterized in that: Inside the heat dissipation box (2), a cavity (61) is formed between two adjacent heat dissipation fins (6). The clamping cavity (61) extends along the width direction of the heat sink (2); The first guide vane (3) and the second guide vane (4) are respectively slidably and limitedly installed in the corresponding clamping cavity (61).

3. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 1, characterized in that: The drive mechanism (5) includes a bidirectional threaded rod (52), a pair of nut seats (53) and a pair of fixed rods (54); The bidirectional threaded rod (52) is rotatably mounted inside the heat sink (2) and extends along the width direction of the heat sink (2); The two nut seats (53) are symmetrically fitted on both sides of the bidirectional threaded rod (52) and are respectively threaded to the threaded portions on both sides of the bidirectional threaded rod (52); The fixing rods (54) are respectively fixed below the corresponding nut seats (53), and both fixing rods (54) extend along the length direction of the heat sink box (2); One of the fixing rods (54) passes through all the first guide vanes (3) and is fixedly connected to each of the first guide vanes (3); the other fixing rod (54) passes through all the second guide vanes (4) and is fixedly connected to each of the second guide vanes (4). A drive device is provided on the outside of the heat sink (2), which is used to drive the bidirectional threaded rod (52) to rotate.

4. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 3, characterized in that: The driving device is a drive motor (51), which is fixed to the side of the heat sink (2); The output shaft of the drive motor (51) is fixedly connected to one end of the bidirectional threaded rod (52).

5. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 3, characterized in that: Both the first guide vane (3) and the second guide vane (4) are provided with relief grooves (01) at their ends. The clearance groove (01) is used to accommodate the fixing rod (54) on the opposite side.

6. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 1, characterized in that: A temperature sensor (11) is fixedly installed on one side of the main housing (1), and the detection part of the temperature sensor (11) is located inside the main housing (1). The temperature sensor (11) is used to collect the temperature inside the main housing (1) in real time and feed the data back to the control unit.

7. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 6, characterized in that: Differential pressure sensors (7) are installed on both sides inside the heat sink (2). The differential pressure sensor (7) has a first detection end (71) and a second detection end (72). The first detection end (71) is arranged on the inner side of the filter screen (22), and the second detection end (72) is arranged on the outer side of the filter screen (22) on the same side; The differential pressure sensor (7) is used to detect the pressure difference between the inside and outside of the filter (22) and feed the data back to the control unit.

8. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 1, characterized in that: A slide bar (23) extending along the length of the heat sink (2) is fixed on the first guide plate (3) closest to one of the air vents (21) and the second guide plate (4) closest to the other air vent (21). Both slide rods (23) slide to the outside of the heat sink (2), and both slide rods (23) are fixed with connecting arms (24) at the ends of the slide rods (23) located outside the heat sink (2). Mounting arms (25) are fixed to the ends of both connecting arms (24), and the mounting arms (25) extend along the width direction of the heat sink (2); Both mounting arms (25) are equipped with scrapers (26) at their ends for scraping and cleaning the filter screen (22) on the same side.

9. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 1, characterized in that: The heat dissipation fins (6) are integrally formed in the part inside the main housing (1) to accommodate the heat-generating components.

10. The anti-clogging heat dissipation structure of the frequency converter drive device in a high-dust environment according to claim 7, characterized in that: Define one end of the first guide vane (3) as end a (301) and the other end as end b (302); Define one end of the second guide vane (4) as end c (401) and the other end as end d (402); Define one of the long side inner walls of the heat sink (2) as surface A (04) and the other long side inner wall as surface B (05). One of the air vents (21) is defined as the first flow port (06), and the other air vent (21) is defined as the second flow port (07). The following are methods to prevent heat dissipation blockage: Operating condition 1: The drive mechanism (5) drives the first guide vane (3) and the second guide vane (4) to move away from each other to the limit state, and each a end (301) abuts against surface A (04), and each c end (401) abuts against surface B (05), forming the first S-shaped heat dissipation channel (02). A heat dissipation airflow A is formed in the heat dissipation box (2) and flows through the first flow port (06), the first S-shaped heat dissipation channel (02) and the second flow port (07) in sequence. Operating Condition 2: The drive mechanism (5) drives the first guide vane (3) and the second guide vane (4) to approach each other to the limit state, with each b end (302) abutting against the B surface (05) and each d end (402) abutting against the A surface (04), forming the second S-shaped heat dissipation channel (03). A heat dissipation airflow B is formed in the heat dissipation box (2) that flows sequentially through the second flow port (07), the second S-shaped heat dissipation channel (03) and the first flow port (06); The cooling airflow A and cooling airflow B flow in opposite directions, and the working conditions one and two are repeated periodically, which can alternately back-blowing and cleaning the filter screens (22) on both sides to prevent clogging.

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