CN118477410A - A special air inlet filter device for the air inlet system of a frequency conversion control cabinet - Google Patents

Abstract

The present invention relates to the technical field of control cabinet air intake system, specifically to an air intake filter device dedicated to the air intake system of a variable frequency control cabinet, comprising a cabinet body and a duct fan for supplying air to the interior thereof, a wind speed sensor being installed at the inner port of the duct fan, and an air filter device being arranged at the outer port of the duct fan, the air filter device comprising a pair of air filter groups, a servo motor for driving a pair of air filter groups to be alternately replaced at the outer port of the duct fan, a hanging column for suspending the servo motor, and a brush net group arranged directly in front of the servo motor. When the wind speed sensor detects that the air delivery speed of the duct fan into the cabinet body is less than a set threshold, the present invention controls the duct fan to pause, and controls the servo motor to start and drive a pair of air filter groups to be alternately replaced, and at the same time, the air filter groups that are rotated out during the exchange process are brushed out of dust by the brush net group, thereby timely ensuring normal blowing, so that the hot air in the cabinet body is discharged in time.

Description

A special air inlet filter device for the air inlet system of a frequency conversion control cabinet

Technical Field

The invention relates to the technical field of control cabinet air intake systems, and in particular to a special air intake filter device for a frequency conversion control cabinet air intake system.

Background Art

The control cabinet is a combination of switchgear, measuring instruments, protective electrical appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinet or on a screen according to the electrical wiring requirements. Its layout should meet the requirements for normal operation of the power system, facilitate maintenance, and not endanger the safety of people and surrounding equipment. There are many types of control cabinets, including electrical control cabinets, frequency conversion control cabinets, low-voltage control cabinets, high-voltage control cabinets, etc. If the control cabinet is equipped with high-power heating equipment such as frequency converters, then the control cabinet needs ventilation and heat dissipation.

It is common sense to know that when a fan is used to supply air into the cabinet, it is necessary to inhale air from the outside, and generally the air is supplied from the bottom of the control cabinet. In this case, dust will inevitably accumulate on the filter at the suction end of the fan. Over time, the air holes at the suction end of the fan will shrink, which will affect the timely discharge of hot air in the control cabinet. At this time, the fan filter is generally removed manually for dust removal, which will cause the fan to stop working for a long time, which is not conducive to the timely heat dissipation of the control cabinet. In addition, the wind blown into the cabinet by the fan alone lacks guidance, so the hot air cannot be discharged in a timely manner.

Summary of the invention

In order to overcome the defects in the prior art, the purpose of the present invention is to provide a special air inlet filter device for the air inlet system of a frequency conversion control cabinet to solve the problems raised in the above background technology.

To achieve the above-mentioned purpose, the present invention provides a special air inlet filter device for the air inlet system of a frequency conversion control cabinet, comprising a cabinet body and a duct fan for supplying air to the interior thereof, an air inlet is provided at the front of the side wall of the cabinet body, an air outlet is provided at the front of the top surface of the cabinet body, the duct fan is installed outside the air inlet, a wind speed sensor is installed at the inner port of the duct fan, an air filter device is provided at the outer port of the duct fan, the air filter device comprises a pair of air filter groups, a servo motor for driving the pair of air filter groups to be alternately replaced at the outer port of the duct fan, a hanging column for lifting the servo motor, and a brush net group provided right in front of the servo motor;

The outer end of the duct fan is spaced and coaxially provided with an air duct, the air duct is of the same size as the outer port of the duct fan, and a connecting plate is welded on the outer wall between the two, the air filter group is composed of an air filter net and a mesh sleeve elastically sleeved on the outside thereof, the mesh sleeve is of the same size as the air duct and is adapted to be snap-fitted with the gap between the duct fan and the air duct, wherein the connecting plate is arranged forward; a guide frame is fixedly connected to the outer side wall of the duct fan, the main body of the guide frame is in an inverted L-shape and its horizontal top end is plugged into a hanging column, a compression spring is sleeved on the outside of the hanging column, a guide groove is opened on the midline of the vertical section of the guide frame, and a guide block snap-fitted with the guide groove and slidable is arranged on the front side wall of the servo motor;

The output shaft of the servo motor is fixedly connected to a connecting rod, the outer end of the connecting rod is fixedly connected to the side of the air filter, the brush net group consists of a brush holder and a plurality of bristles embedded on one side thereof, an arc-shaped pressure rod is provided at the upper end of the brush holder toward the rear of the cabinet, and the inner side surface of the pressure rod is arranged flush with the mesh surface of the air filter.

As a further improvement of the technical solution, the inner wall of the mesh sleeve is provided with a plurality of grooves at equal intervals in a circular shape, and the outer side of the air filter is provided with a plurality of blocks at equal intervals in a circular shape, the blocks are engaged with the grooves, and a spring is bonded between the blocks and the grooves.

As a further improvement of the present technical solution, a pair of slide grooves are opened on the side wall of the mesh sleeve facing the servo motor, the connecting rod is a cross rod structure and its two ends on the same side are slidably engaged with a pair of slide grooves, and the outer end of the connecting rod is fixedly connected to the outer side of the air filter.

As a further improvement of the present technical solution, when the servo motor drives the mesh sleeve to rotate out of the air duct, it will touch the ground and push the servo motor upward, so that the rotated mesh sleeve will form an arc path when passing under the servo motor, and the pressure rod is placed horizontally on the upper edge of the arc path, and the inner end of the pressure rod is provided with an oblique chamfer.

As a further improvement of the present technical solution, the top end of the connecting plate is tilted forward, the outer side of the vertical section of the guide frame is provided with an arc plate fixedly connected to the outer side wall of the duct fan by bolts, and the side of the brush holder facing the air duct is provided with an arc plate fixedly connected to the outer side wall of the air duct by bolts.

As a further improvement of the present technical solution, the two inner walls of the cabinet are alternately provided with air guide groups for guiding the wind of the duct fan to the air outlet, the lowermost air guide group is opposite to the air inlet, and the uppermost air guide group is located on the bottom side of the air outlet; the air guide group includes an air guide plate attached to the inner wall of the cabinet, a curved plate member for squeezing the upper end of the air guide plate and a rotating sleeve for suspending the curved plate member for swinging and rotating.

As a further improvement of the present technical solution, the vertical sides of the air guide plate are inwardly bent and a fixing rod is inserted into the bottom thereof, the fixing rod passes through the rear wall of the cabinet, and a plurality of sockets are provided on both sides of the cabinet, which are plugged into and matched with the air guide plate.

As a further improvement of the present technical solution, the upper end of the curved plate member is wider than its lower end, and the top surface of the vertical section of the curved plate member is provided with a rotating column which is plugged into the middle part of the rotating sleeve. An annular groove is provided in the middle of the rotating column, and a pin passes through the outer wall of the rotating sleeve and extends into the annular groove. Torsion springs are provided at both ends of the rotating sleeve, and blocks are provided at the edges of both ends of the rotating sleeve. A pair of fixed sleeves are provided in the middle part of the rotating sleeve, and the fixed sleeves are fixedly connected to the outer wall of the cabinet body by bolts, and the middle part of the torsion spring is clamped between the pair of fixed sleeves.

As a further improvement of the technical solution, a heat dissipation hood is fixedly connected to the outside of the air outlet by bolts, the upper half of the heat dissipation hood is cylindrical and a blade wheel is coaxially arranged inside it, the outer diameter of the blade wheel is matched with the inner diameter of the upper half of the heat dissipation hood, the bottom surface of the heat dissipation hood is provided with an air gathering port, and a heat dissipation port is provided on one side of the top of the heat dissipation hood.

As a further improvement of the technical solution, a heat dissipation cover is rotatably connected in the heat dissipation port, and an arc-shaped windshield is provided on the inner wall of the heat dissipation cover and below the heat dissipation port. The windshield is coaxially arranged with the upper half of the central axis of the heat dissipation cover.

Compared with the prior art, the present invention has the following beneficial effects:

1. The frequency conversion control cabinet air intake system is equipped with a special air intake filter device. Through the wind speed sensor arranged at the inner end of the duct fan and the air filter device arranged at the outer end of the duct fan, when the wind speed sensor detects that the air delivery speed of the duct fan into the cabinet is less than the set threshold, the duct fan is controlled to pause, and the servo motor is controlled to start and drive a pair of air filter groups to be replaced alternately. At the same time, during the exchange process, the air filter group that is rotated out is brushed out of dust by the brush net group, and the other air filter group is also rotated between the air duct and the duct fan to replace the dusty air filter group. At this time, the duct fan is controlled to continue to start and blow fresh air into the cabinet, thereby ensuring normal blowing in time and allowing the hot air in the cabinet to be discharged in time.

2. The frequency conversion control cabinet air intake system is equipped with a dedicated air intake filter device. Through a plurality of air guide groups alternately arranged on the two inner walls of the cabinet, when the curved plate is inserted into the cabinet from the socket and squeezes the air guide plate, the top of the air guide plate will be bent to form a wind turning point, so that the wind blown into the cabinet rises in an S shape and carries the hot air to be discharged quickly and thoroughly.

3. The frequency conversion control cabinet air intake system is equipped with a special air intake filter device. Through the heat dissipation cover set at the air outlet on the top of the cabinet, the wind guided up by the air guide group is led to the end of the air gathering port far away from the heat dissipation port through the wind shield plate, and then goes up from the inner wall of the heat dissipation cover to drive the blade wheel to rotate counterclockwise, and the hot air is thrown along the inside of the heat dissipation cover, which can not only discharge the hot air, but also prevent the heat dissipation cover from being overturned.

4. The special air inlet filter device for the air inlet system of the frequency conversion control cabinet is elastically connected by the mesh sleeve and the air filter net, so that the mesh sleeve wraps the air filter net and is inserted behind the air duct, and when it is rotated out, it prevents the dust on the air filter net from being scraped off by the air duct and falling on the air duct of the duct fan, until the servo motor drives the mesh sleeve to be completely rotated out of the air duct, and then the pressure rod contacts the mesh sleeve and guides it to slide to the inner side of the pressure rod, and then the mesh sleeve is flush with the air filter net, and the dust originally falling on the bottom of the mesh sleeve is discharged, ensuring the cleanliness of the inside of the air duct.

5. The dedicated air inlet filter device for the air inlet system of the frequency conversion control cabinet guides the lifting of the hanging column on the servo motor through the guide frame, and the servo motor is reset by the spring outside the hanging column, so that when a pair of air filter groups are replaced, they can touch the ground to push the servo motor up to avoid interference, so that the duct fan can be installed at the lowest position, so that the air can enter from the bottom of the cabinet and discharge all the hot air.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

FIG1 is a schematic diagram of the overall assembly structure of the present invention;

FIG2 is a schematic diagram of the internal assembly structure of the cabinet of the present invention;

FIG3 is a front view of FIG2 of the present invention;

FIG4 is a side view of FIG2 of the present invention;

FIG5 is a schematic structural diagram of the air filter device of FIG4 in the filtering state of the present invention;

FIG6 is a schematic diagram of the assembly structure of the air filter device of the present invention;

FIG7 is a partial exploded view of the air filter device of the present invention;

FIG8 is a schematic diagram of the assembly structure of the brush mesh assembly of the present invention;

FIG9 is a disassembled view of the air filter group and the suspender assembly of the present invention;

FIG10 is a schematic diagram of the cabinet structure of the present invention;

FIG11 is a schematic diagram of the assembly structure of the air guide group of the present invention;

FIG12 is a diagram of the assembly and disassembly of the curved plate member of the present invention;

FIG13 is a schematic diagram of the heat dissipation cover assembly structure of the present invention;

FIG. 14 is a disassembled view of the heat dissipation cover of the present invention.

The meaning of each number in the figure is:

100, cabinet; 101, air inlet; 102, air outlet; 103, socket; 110, duct fan; 111, air duct; 112, connecting plate;

200, air filter device; 210, air filter group; 211, air filter net; 2111, block; 2112, spring; 212, net sleeve; 2121, slot; 2122, slide; 220, servo motor; 221, connecting rod; 230, hanging column; 231, compression spring; 232, guide block; 240, brush net group; 241, brush holder; 2411, brush hair; 242, pressure rod; 2421, chamfer; 250, guide holder; 251, guide slot;

300, air guide group; 310, air guide plate; 311, fixing rod; 320, curved plate member; 321, rotating column; 322, annular groove; 330, rotating sleeve; 331, stopper; 332, fixing sleeve; 340, torsion spring;

400, heat dissipation hood; 401, air gathering vent; 402, heat dissipation vent; 403, wind shield; 410, blade wheel; 420, heat dissipation cover.

DETAILED DESCRIPTION

The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as falling within the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

Please refer to FIGS. 1 to 14 , the present invention provides a special air inlet filter device for the air inlet system of a variable frequency control cabinet, including a cabinet 100 and a duct fan 110 for supplying air to the interior thereof, an air inlet 101 is provided at the front of the side wall of the cabinet 100, an air outlet 102 is provided at the front of the top surface of the cabinet 100, the duct fan 110 is installed outside the air inlet 101, a wind speed sensor is installed at the inner port of the duct fan 110, and an air filter device 200 is provided at the outer port of the duct fan 110, the air filter device 200 includes a pair of air filter groups 210, and a pair of air filter groups 210 are used to drive the pair of air filter groups 210 to move in the duct fan 110. The servo motor 220 that is replaced alternately at the outer port, the hanging column 230 for hanging the servo motor 220, and the brush net group 240 that is arranged in front of the servo motor 220; the wind speed sensor controls the start and stop of the duct fan 110 and the servo motor 220 through the control device, such as the relay and the PLC module. When the wind speed sensor detects that the air delivery speed of the duct fan 110 into the cabinet 100 is less than the set threshold, the duct fan 110 is controlled to be paused, and the servo motor 220 is controlled to start and drive a pair of filter groups 210 to be replaced alternately, and the dust is brushed out by the brush net group 240 during the exchange process;

The ultrasonic time difference method can be used to measure the wind speed. The ultrasonic time difference method measures the change in the propagation speed of ultrasonic waves in the air to infer the wind speed; the analog signal collected by the sensor is converted into a digital signal through an analog-to-digital converter, such as ADC0832, and the data is processed in a single-chip microcomputer, such as STC89C52, and the start and stop states of the duct fan 110 and the servo motor 220 are controlled according to a preset threshold value. The above is the existing technology and will not be repeated here.

Specifically, the outer end of the duct fan 110 is spaced apart and coaxially provided with an air duct 111, the air duct 111 is of the same size as the outer end of the duct fan 110, and a connecting plate 112 is welded on the outer wall between the two to strengthen the stability of the connection; the air filter group 210 is composed of an air filter net 211 and a net sleeve 212 elastically sleeved on the outside thereof, that is, the air filter net 211 and the net sleeve 212 can slide elastically in the axial direction to prevent the air filter net 211 from contacting the air duct 111 when it is rotated out and being scraped off and accumulated dust remaining in the air duct 111; the net sleeve 212 is of the same size as the air duct 111 and the net sleeve 212 is aligned with the duct fan 110 and the air duct 111 1 is adapted to be snap-fitted, wherein the connecting plate 112 is arranged forward; the outer end side wall of the duct fan 110 is fixedly connected with a guide frame 250, the main body of the guide frame 250 is in an inverted L shape and its horizontal top end is plugged with the hanging column 230, and the hanging column 230 is fixedly connected with a circular ring sleeved on the outer wall of the servo motor 220 by bolts; the outer sleeve of the hanging column 230 is sleeved with a compression spring 231, and a guide groove 251 is opened on the vertical section center line of the guide frame 250, and a guide block 232 that is snap-fitted with the guide groove 251 and can slide is arranged on the front side wall of the servo motor 220, so as to prevent the servo motor 220 from rotating during the lifting process;

The output shaft of the servo motor 220 is fixedly connected to a connecting rod 221, and the outer end of the connecting rod 221 is welded to the side of the air filter net 211 or fixedly connected by bolts; the brush net group 240 is composed of a brush frame 241 and a plurality of bristles 2411 embedded on one side thereof, and an arc-shaped pressure rod 242 is provided at the upper end of the brush frame 241 toward the rear of the cabinet 100, and the inner side surface of the pressure rod 242 is flush with the mesh surface of the air filter net 211. Through this design, when the air filter group 210 rotates out of the gap between the air duct 111 and the duct fan 110, the pressure rod 242 squeezes the mesh sleeve 212 and retreats to be flush with the air filter net 211, and then the bristles 2411 brush off the dust accumulated on the air filter net 211 and discharge it, and then it can be swept away.

Furthermore, the inner wall of the mesh sleeve 212 is provided with a plurality of slots 2121 in an annular shape and at equal intervals, and the outer side of the air filter 211 is provided with a plurality of blocks 2111 in an annular shape and at equal intervals, the blocks 2111 are engaged with the slots 2121, and a spring 2112 is bonded between the blocks 2111 and the slots 2121; that is, the mesh sleeve 212 is retracted by the spring 2112 to wrap the air filter 211;

A pair of slide grooves 2122 are opened on the side wall of the mesh sleeve 212 facing the servo motor 220. The connecting rod 221 is a cross rod structure and its two ends on the same side are slidably engaged with a pair of slide grooves 2122. The outer end of the connecting rod 221 is fixedly connected to the outer side of the air filter 211 to prevent the mesh sleeve 212 from being interfered with.

Furthermore, when the servo motor 220 drives the mesh sleeve 212 to rotate out of the air duct 111, it will touch the ground and push the servo motor 220 upward, and then the mesh sleeve 212 that rotates out will form an arc path when passing under the servo motor 220. The pressure rod 242 is horizontally placed on the upper edge of the arc path so as to contact the upper part of the rotating mesh sleeve 212. The inner end of the inner side of the pressure rod 242 is provided with an oblique chamfer 2421, which first contacts the mesh sleeve 212 through the oblique chamfer 2421 to guide it to slide to the inner side of the pressure rod 242, and then the mesh sleeve 212 is flush with the air filter 211, and the dust originally falling on the bottom of the mesh sleeve 212 is discharged;

The top end of the connecting plate 112 is tilted forward so that when it is flipped from the top to the rear of the air duct 111, it is guided by the connecting plate 112 and fits in; an arc piece is provided on the outer side of the vertical section of the guide frame 250, which is fixedly connected to the outer side wall of the duct fan 110 by bolts, so that the guide frame 250 is fixed and supports the servo motor 220 to work stably; an arc piece is provided on the side of the brush frame 241 facing the air duct 111, which is fixedly connected to the outer side wall of the air duct 111 by bolts, so that the brush frame 241 is fixed and guides the mesh sleeve 212 to switch positions for dust removal.

In addition, the two inner side walls of the cabinet 100 are alternately provided with air guide groups 300 for guiding the wind of the duct fan 110 to the air outlet 102, the lowermost air guide group 300 is directly opposite to the air inlet 101, and the uppermost air guide group 300 is located at the bottom side of the air outlet 102; so that the wind blown into the cabinet 100 rises along an S shape and carries the hot air to be discharged quickly and thoroughly; the air guide group 300 includes an air guide plate 310 attached to the inner wall of the cabinet 100, a curved plate member 320 for squeezing the upper end of the air guide plate 310 to bend, and a rotating sleeve 330 for hanging the curved plate member 320 to swing and rotate;

The two sides of the vertical sides of the air guide plate 310 are inwardly bent and a fixing rod 311 is inserted at the bottom thereof. The fixing rod 311 penetrates the rear wall of the cabinet 100. A plurality of sockets 103 are provided on both sides of the cabinet 100. The sockets 103 are plugged and matched with the air guide plate 310.

The upper end of the curved plate 320 is wider than the lower end thereof. When the curved plate 320 is inserted into the cabinet 100 from the socket 103 and squeezes the air guide plate 310, the top of the curved plate 320 is squeezed and bent to form a wind deflection point. The top surface of the vertical section of the curved plate 320 is provided with a rotating column 321 plugged into the middle of the rotating sleeve 330. The middle of the rotating column 321 is provided with an annular groove 322. The outer wall of the rotating sleeve 330 is penetrated with a pin and the pin extends into the annular groove 322, so that the curved plate 320 can stably rotate under the suspension of the rotating sleeve 330. The middle part of the rotating sleeve 330 is provided with a pair of fixed sleeves 332, and the fixed sleeves 332 are fixedly connected to the outer wall of the cabinet 100 by bolts to support the stable rotation of the rotating sleeve 330.

Torsion springs 340 are sleeved on both ends of the rotating sleeve 330, and blocks 331 are provided at the edges of both ends of the rotating sleeve 330 to resist the outer ends of the torsion spring 340 and apply elastic force to the rotating sleeve 330; the middle part of the torsion spring 340 is clamped between a pair of fixed sleeves 332, and when the inclined surface of the rotating curved plate 320 is facing the socket 103, the hand is released, and the rebound force of the torsion spring 340 drives the curved plate 320 to automatically push the air guide plate 310; when storing, first pull out the curved plate 320 to detach from the socket 103 and rotate it 90 degrees before letting go, and use the rebound force of the torsion spring 340 to drive the side of the curved plate 320 to stick to the outer wall of the cabinet 100 without taking up space.

It is worth noting that the outside of the air outlet 102 is fixedly connected to the heat dissipation cover 400 by bolts, the upper half of the heat dissipation cover 400 is cylindrical and a blade wheel 410 is coaxially arranged inside the heat dissipation cover 400, the outer diameter of the blade wheel 410 is adapted to the inner diameter of the upper half of the heat dissipation cover 400, the bottom surface of the heat dissipation cover 400 is provided with an air gathering port 401, and a heat dissipation port 402 is provided on one side of the top of the heat dissipation cover 400, so that the wind enters the heat dissipation cover 400 from the air gathering port 401 and is discharged from the heat dissipation port 402 through the rotation of the blade wheel 410;

A heat dissipation cover 420 is rotatably connected inside the heat dissipation port 402, and the hot air between the blade wheels 410 will push the heat dissipation cover 420 open and be discharged. When the blade wheels 410 are not working, the heat dissipation cover 420 automatically hangs down to cover the heat dissipation port 402, thereby preventing outside air from falling into the cabinet 100; a circular arc wind shield 403 is provided on the inner wall of the heat dissipation cover 400 and is located below the heat dissipation port 402. The wind shield 403 is coaxially arranged with the upper half of the circle center axis of the heat dissipation cover 400, that is, the wind drawn up by the wind guide plate 310 is blocked by the wind shield 403, and directly rushes out from the bottom of the heat dissipation cover 420 without being overturned and falling back, that is, the wind shield 403 draws the wind to one end of the air gathering port 401 away from the heat dissipation port 402, and then goes up from the inner wall of the heat dissipation cover 400 to drive the blade wheels 410 to rotate counterclockwise, and throws the hot air along the inner side of the heat dissipation cover 420, which can both discharge the hot air and prevent the heat dissipation cover 420 from being overturned.

When the dedicated air inlet filter device for the air inlet system of the frequency conversion control cabinet of the present invention detects that the air delivery speed of the duct fan 110 into the cabinet 100 is less than the set threshold value by the wind speed sensor, it means that the air filter net 211 has accumulated a large amount of dust and the mesh size has been reduced, then the duct fan 110 is controlled to be paused, and the servo motor 220 is controlled to start and drive a pair of air filter groups 210 to be replaced alternately. At the same time, during the replacement process, the air filter net 211 rotated out from the rear of the air duct 111 passes through the brush net group 240, and the dust is brushed off by the brush hairs until the net sleeve 212 is squeezed by the pressure rod 242 and flush with the outer side of the air filter net 211, the dust originally falling on the bottom of the net sleeve 212 is discharged and then swept away; and the other air filter group 210 is also transferred between the air duct 111 and the duct fan 110 to replace the dusty air filter group 210. At this time, the duct fan 110 is controlled to continue to start and blow fresh air into the cabinet 100;

The fresh air blown into the cabinet 100 rises along an S-shaped route under the guidance of a plurality of wind guide plates 310, and carries the hot air into the heat dissipation cover 400, and is guided to the end of the air collecting port 401 away from the heat dissipation port 402 by the wind shield 403, and then goes up from the inner wall of the heat dissipation cover 400 to drive the blade wheel 410 to rotate counterclockwise, and throws the hot air along the inner side of the heat dissipation cover 420, which can not only discharge the hot air, but also prevent the heat dissipation cover 420 from being overturned, thereby ensuring the cleanliness of the internal environment of the cabinet 100.

It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a special air inlet filter equipment of frequency conversion switch board air inlet system, includes the cabinet body (100) and to its inside air supply's pipeline fan (110), air intake (101) have been seted up to the lateral wall of the cabinet body (100) near the department in front, air outlet (102) have been seted up to the top surface of the cabinet body (100) near the department in front, pipeline fan (110) are installed outside air intake (101), wind speed sensor is installed to the inner port of pipeline fan (110), its characterized in that: the outer port of the pipeline fan (110) is provided with a wind filtering device (200), the wind filtering device (200) comprises a pair of wind filtering groups (210), a servo motor (220) used for driving the pair of wind filtering groups (210) to be alternately replaced at the outer port of the pipeline fan (110), a lifting column (230) used for lifting the servo motor (220) and a brushing net group (240) arranged right in front of the servo motor (220);

The outer end of the pipeline fan (110) is provided with air pipes (111) at intervals and coaxially, the air pipes (111) are in the same size with the outer ports of the pipeline fan (110), a connecting plate (112) is welded on the outer wall between the air pipes and the outer ports of the pipeline fan, the air filtering group (210) consists of an air filtering net (211) and a net sleeve (212) sleeved on the outer side of the air filtering net, the net sleeve (212) is arranged in the same size with the air pipes (111), the net sleeve (212) is in clearance fit and clamping connection with the pipeline fan (110) and the air pipes (111), and the connecting plate (112) is arranged forwards; the outer end side wall of the pipeline fan (110) is fixedly connected with a guide frame (250), the main body of the guide frame (250) is in an inverted L shape, the horizontal top end of the guide frame is inserted into a hanging column (230), a pressure spring (231) is sleeved outside the hanging column (230), a guide groove (251) is formed in the middle line of the vertical section of the guide frame (250), and a guide block (232) which is clamped with the guide groove (251) and can slide is arranged on the front side wall of the servo motor (220);

output shaft fixedly connected with connecting rod (221) of servo motor (220), the outer end of connecting rod (221) and wind screen (211) side fixed connection, brush net group (240) are by brush yoke (241) and a plurality of brush hair (2411) that the side inlayed and are established, the upper end of brush yoke (241) and towards cabinet body (100) rear are equipped with and are curved depression bar (242), the medial surface of depression bar (242) flushes the setting with wind screen (211) screen surface.

2. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 1, wherein: the inner wall of the net sleeve (212) is annular and equidistant and provided with a plurality of clamping grooves (2121), the outer side of the air filtering net (211) is annular and equidistant and provided with a plurality of clamping blocks (2111), the clamping blocks (2111) are clamped with the clamping grooves (2121), and springs (2112) are adhered to the sides between the clamping blocks (2111) and the clamping grooves (2121).

3. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 2, wherein: the net cover (212) is provided with a pair of sliding grooves (2122) towards the side wall of the servo motor (220), the connecting rod (221) is of a cross rod structure, two ends of the same side of the connecting rod are clamped with the pair of sliding grooves (2122) and can slide, and the outer end of the connecting rod (221) is fixedly connected with the outer side of the air filtering net (211).

4. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 3, wherein: the servo motor (220) drives the net sleeve (212) to touch the ground when the net sleeve (212) rotates out of the air pipe (111) and reversely pushes the servo motor (220) to ascend, the rotated net sleeve (212) passes through the lower part of the servo motor (220) to form an arc-shaped path, the pressure rod (242) is transversely arranged at the edge above the arc-shaped path, and an inclined chamfer (2421) is arranged at the inner end of the inner side of the pressure rod (242).

5. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 4, wherein: the top of connecting plate (112) slope forward and set up, the vertical section outside of guide frame (250) is equipped with the arc piece through bolt fixed connection with pipeline fan (110) outer end lateral wall, one side that brush yoke (241) towards tuber pipe (111) is provided with the arc piece through bolt fixed connection with tuber pipe (111) outer lateral wall.

6. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 5, wherein: the two inner side walls of the cabinet body (100) are alternately provided with air guide groups (300) for guiding air of the pipeline fan (110) to the air outlet (102), the lowest air guide group (300) faces the air inlet (101), and the uppermost air guide group (300) is positioned at one side of the bottom of the air outlet (102); the air guide group (300) comprises an air guide plate (310) attached to the inner wall of the cabinet body (100), a curved plate piece (320) used for extruding the upper end of the air guide plate (310) to bend, and a rotating sleeve (330) used for hanging the curved plate piece (320) to swing and rotate.

7. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 6, wherein: the utility model discloses a cabinet, including cabinet body (100), aviation baffle (310), fixed lever (311) are pegged graft in perpendicular limit both sides of aviation baffle (310) are inwards bending structure and its bottom, fixed lever (311) run through cabinet body (100) back wall, a plurality of sockets (103) have been seted up to the both sides of cabinet body (100), socket (103) are pegged graft with aviation baffle (310) and are cooperated.

8. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 7, wherein: the upper end of bent plate spare (320) is wider than its lower extreme, vertical section top surface of bent plate spare (320) is equipped with swivel post (321) with changeing cover (330) middle part grafting, annular channel (322) have been seted up at the middle part of swivel post (321), the outer wall of changeing cover (330) runs through there is the pin and the pin stretches into in annular channel (322), the both ends cover of changeing cover (330) is equipped with torsional spring (340), the both ends edge of changeing cover (330) is equipped with dog (331), the middle part cover of changeing cover (330) is equipped with a pair of fixed cover (332), fixed cover (332) pass through bolt fixed connection with cabinet body (100) outer wall, the middle part joint of torsional spring (340) is between a pair of fixed cover (332).

9. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 8, wherein: the air outlet (102) is fixedly connected with a heat radiation cover (400) through bolts, the upper half part of the heat radiation cover (400) is cylindrical, a vane wheel (410) is coaxially arranged in the heat radiation cover, the outer diameter of the vane wheel (410) is matched with the inner diameter of the upper half part of the heat radiation cover (400), the bottom surface of the heat radiation cover (400) is provided with a wind gathering port (401), and one side of the top of the heat radiation cover (400) is provided with a heat radiation port (402).

10. The special air inlet filter device for the air inlet system of the variable frequency control cabinet according to claim 9, wherein: the heat radiation cover (420) is rotationally connected to the heat radiation opening (402), a wind shield (403) which is in an arc shape is arranged on the inner wall of the heat radiation cover (400) and below the heat radiation opening (402), and the wind shield (403) and the center shaft of the upper half part of the heat radiation cover (400) are coaxially arranged.