CN113036618A

CN113036618A - Power distribution cabinet

Info

Publication number: CN113036618A
Application number: CN202110508289.8A
Authority: CN
Inventors: 李登进
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-06-25

Abstract

The invention discloses a power distribution cabinet, which belongs to the technical field of power equipment and comprises a cabinet body, cabinet doors, a lifting assembly and a supporting assembly, wherein the cabinet body is arranged on the ground, heat dissipation holes are formed in two sides of the cabinet body, a first accommodating cavity and a second accommodating cavity are formed in the cabinet body, opening and closing doors are arranged on two sides of the second accommodating cavity, the cabinet doors are arranged on one side of the cabinet body and are connected with the cabinet doors in a hinge mode, the lifting assembly is arranged in the first accommodating cavity of the cabinet body, the supporting assembly is arranged at the lower end of the cabinet body and is positioned in the second accommodating cavity, when the power distribution cabinet is used, the space for installing parts in the cabinet body can be adjusted through the lifting assembly, so that people can install parts with different sizes in the cabinet body conveniently, the cabinet body can be installed on different heights or uneven ground through the supporting assembly, the stable placement of the cabinet body is guaranteed, and a, and the cabinet body is inconvenient to adjust by increasing the cushion blocks.

Description

Power distribution cabinet

Technical Field

The invention relates to the technical field of power equipment, in particular to a power distribution cabinet.

Background

The distribution cabinet is a final-stage device of a distribution system. The power distribution cabinet is a general name of a motor control center. The power distribution cabinet is used in the occasions with dispersed loads and less loops; the motor control center is used for occasions with concentrated loads and more loops. They distribute the power of a certain circuit of the upper-level distribution equipment to the nearby loads. This level of equipment should provide protection, monitoring and control of the load.

The switch board often uses in different environment, for example highly differ or uneven ground, and this often needs to increase the mode of cushion in the switch board below to guarantee that it lays surely, but increase the inconvenient adjustment of mode of cushion.

Disclosure of Invention

The invention aims to provide a power distribution cabinet to solve the technical problems that in the prior art, the power distribution cabinet is often used in different environments, such as different heights or uneven ground, a cushion block needs to be added below the power distribution cabinet to ensure the stable placement of the power distribution cabinet, but the cushion block is added to be inconvenient to adjust.

In order to solve the technical problems, the invention provides the following technical scheme: including the cabinet body, cabinet door, lifting unit and supporting component, the cabinet body sets up subaerial, and all establish the louvre on the both sides of the cabinet body to the inside of the cabinet body is equipped with first chamber and the chamber is held to the second, and the second both sides department that holds the chamber all is equipped with the switch door, the cabinet door sets up on one side of the cabinet body and with cabinet door hinge connection, lifting unit sets up the first intracavity that holds at the cabinet body, the supporting component sets up at the lower extreme of the cabinet body and is located the second and holds the intracavity to supporting component and cabinet body coupling.

Furthermore, the number of the supporting components is four, the four supporting components are respectively arranged at the lower end of the cabinet body and are fixedly connected with the cabinet body, each supporting component comprises two fixing frames, a rotating shaft, a roller shaft, first gears, second gears and a lifting rod, the two fixing frames are respectively symmetrically arranged in the second accommodating cavity, the rotating shaft is arranged on the two fixing frames, one end of the rotating shaft penetrates through the fixing frames, a handle is arranged on the rotating shaft, one end of the rotating shaft penetrates through the fixing frames, the handle is connected with the rotating shaft, the roller shaft is arranged between the two fixing frames and is positioned below the rotating shaft, the two first gears are respectively arranged on the rotating shaft and the roller shaft and are mutually meshed, the two first gears are respectively connected with the rotating shaft and the roller shaft, the second gear is arranged on the roller shaft and is positioned on one side of the first gears, and the first gear is connected with the roll shaft, the lifting rod is positioned on one side of the second gear, a plurality of tooth grooves are formed in one side, close to the second gear, of the lifting rod and are meshed with the second gear, and a base is arranged at the lower end of the lifting rod and is fixedly connected with the lifting rod.

Further, be equipped with the locking piece on the supporting component, locking piece quantity is the same with supporting component quantity, the locking piece comprises bull stick, locking wheel and locking piece, the bull stick sets up between two mounts and is located the top of pivot one side, the locking wheel sets up in the pivot and is located one side of first gear and is connected with the pivot, the locking piece sets up on the bull stick and is connected with the pivot to one of locking piece is served and is equipped with the grab handle, is equipped with the locking pole on the other end of locking piece.

Furthermore, both sides of the first gear and the second gear are provided with limiting sleeves.

Furthermore, the two lifting assemblies are respectively arranged at the upper end and the lower end of the first accommodating cavity, the two lifting assemblies comprise guide rods, a mounting plate, a bearing plate, a first rotating shaft, a second rotating shaft, a lifting motor and a bevel gear, the two guide rods are respectively symmetrically arranged in the first accommodating cavity, the mounting plate is arranged on the two guide rods and is movably connected with the two guide rods, the bearing plate is arranged in the first accommodating cavity and is positioned below the mounting plate, the first rotating shaft is arranged at the top end of the bearing plate, one end of the first rotating shaft penetrates through the bearing plate and is positioned at the inner side of the bearing plate, the second rotating shaft is arranged on the first rotating shaft, the first rotating shaft is in threaded connection with the second rotating shaft, the top end of the second rotating shaft is connected with the mounting plate, and the lifting motor is arranged at one side of the bearing plate, and the output end of the lifting motor penetrates through the bearing plate and is positioned inside the bearing plate, two bevel gears are arranged, the two bevel gears are respectively arranged on the output end of the lifting motor and the first rotating shaft, and the two bevel gears are meshed with each other.

Furthermore, a support is arranged on the top end of the bearing plate and arranged on the top end of the bearing plate, and one end of the support penetrates through the second rotating shaft.

Further, the outside of the cabinet body is equipped with the dust screen, the dust screen is equipped with two, and two dust screens are located the outside of two louvres respectively to two dust screens are by the bolt fastening on the cabinet body.

Further, the first chamber that holds inside be equipped with negative-pressure air blower is equipped with two, and two negative-pressure air blowers set up at the first intracavity that holds to two negative-pressure air blowers are located the inboard of louvre.

Compared with the prior art, the invention has the beneficial effects that:

firstly, when the cabinet body is required to be installed on the ground with different heights or unevenness, a person can open the switch door, the handle is shaken clockwise to drive the rotating shaft to rotate, the rotating shaft drives the first gears to rotate, the two first gears are meshed to drive the roller shaft to rotate, the roller shaft drives the second gear to rotate, the second gear can drive the lifting rod to descend, the base at the lower end of the lifting rod supports the cabinet body, and when the handle is shaken anticlockwise, the lifting rod is driven to ascend through the second gear, so that the person can conveniently install the cabinet body according to different heights.

When the support assembly is required to be adjusted according to different heights, when the handle rotates clockwise to synchronously drive the first gear and the locking wheel to descend, the locking rod on the locking block shakes up and down on the locking wheel, after the support assembly is adjusted by a person, the locking rod falls into a tooth groove of the locking wheel to lock the locking wheel, so that the lifting rod is stably supported on the ground to support the cabinet body, when the handle rotates anticlockwise to synchronously drive the first gear and the locking wheel to ascend, the grab handle on the locking block can be pressed downwards to enable the locking rod on the locking block to move out of the locking wheel, and the handle can drive the rotating shaft to rotate.

When the lifting motor rotates anticlockwise, the mounting plate can be driven to descend by the second rotating shaft, so that different parts can be mounted in the cabinet body to adjust the mounting space in the cabinet body.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective sectional view of the present invention;

FIG. 3 is a first schematic view of a lifting assembly according to the present invention;

FIG. 4 is a second schematic structural view of the lifting assembly of the present invention;

FIG. 5 is a schematic view of a support assembly according to the present invention;

FIG. 6 is a schematic view of a portion of the support assembly of the present invention;

FIG. 7 is a schematic view of a latch according to the present invention;

FIG. 8 is a sectional view of the connection between the negative pressure fan and the cabinet in the present invention.

The reference numbers in the figures are:

the cabinet body 1, the dust screen 11, the cabinet door 2, the lifting assembly 3, the guide rod 31, the mounting plate 32, the bearing plate 33, the support 331, the first rotating shaft 34, the second rotating shaft 35, the lifting motor 36, the bevel gear 37, the support assembly 4, the fixed mount 41, the rotating shaft 42, the handle 421, the roller shaft 43, the first gear 44, the second gear 45, the lifting rod 46, the locking piece 47, the rotating rod 471, the locking wheel 472, the locking block 473, the grab handle 474, the locking rod 475, the stop collar 48, the first accommodating cavity 5, the negative pressure fan 51, the second accommodating cavity 6 and the opening and closing door 61.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Referring to fig. 1 to 8, the invention provides a power distribution cabinet, which comprises a cabinet body 1, a cabinet door 2, a lifting assembly 3 and a support assembly 4, wherein the cabinet body 1 is arranged on the ground, heat dissipation holes are formed in two sides of the cabinet body 1, a first accommodating cavity 5 and a second accommodating cavity 6 are formed in the cabinet body 1, switch doors 61 are arranged on two sides of the second accommodating cavity 6, the cabinet door 2 is arranged on one side of the cabinet body 1 and is hinged with the cabinet door 2, the lifting assembly 3 is arranged in the first accommodating cavity 5 of the cabinet body 1, the support assembly 4 is arranged at the lower end of the cabinet body 1 and is positioned in the second accommodating cavity 6, the support assembly 4 is connected with the cabinet body 1, when in use, the space for installing parts in the cabinet body 1 can be adjusted through the lifting assembly 3, so that personnel can install parts with different sizes in the cabinet body 1, and then the support assembly 4 can install the cabinet body 1 at different heights or uneven ground, the guarantee cabinet body 1 is laid stably to need not to place the cushion in the below of the cabinet body 1, and the mode that increases the cushion is inconvenient adjusts the cabinet body 1.

The four supporting components 4 are respectively arranged at the lower end of the cabinet body 1 and fixedly connected with the cabinet body 1, each supporting component 4 is composed of a fixing frame 41, a rotating shaft 42, a roller shaft 43, a first gear 44, a second gear 45 and a lifting rod 46, the two fixing frames 41 are respectively and symmetrically arranged in the second accommodating cavity 6, the rotating shaft 42 is arranged on the two fixing frames 41, one end of the rotating shaft 42 penetrates through the fixing frame 41, a handle 421 is arranged on the rotating shaft 42, one end of the rotating shaft penetrates through the fixing frame 41, the handle 421 is connected with the rotating shaft 42, the roller shaft 43 is arranged between the two fixing frames 41 and is positioned below the rotating shaft 42, the two first gears 44 are arranged on the rotating shaft 42 and the roller shaft 43 respectively, the two first gears 44 are meshed with each other, the two first gears 44 are respectively connected with the rotating shaft 42 and the roller shaft 43, the second gear 45 is arranged on the roller shaft 43 and is positioned at one side of the first gear 44, the first gear 44 is connected with the roller shaft 43, the lifting rod 46 is positioned at one side of the second gear 45, the lifting rod 46 is provided with a plurality of tooth grooves at one side close to the second gear 45 and is mutually meshed with the second gear 45, the lower end of the lifting rod 46 is provided with a base and is fixedly connected with the lifting rod 46, when the cabinet body 1 is required to be installed on the ground with different heights or uneven surfaces in use, a person can open the switch door 61, swing the handle 421 clockwise to drive the rotating shaft 42 to rotate, drive the first gear 44 to rotate through the rotating shaft 42, drive the roller shaft 43 to rotate through the meshing of the two first gears 44, enable the roller shaft 43 to drive the second gear 45 to rotate, drive the lifting rod 46 to descend through the second gear 45, and support the cabinet body 1 through the base at the lower end of the lifting rod 46, when the handle 421 is swung counterclockwise, the lifting rod 46 is driven to ascend through the second gear 45, so that the person can install the cabinet 1 according to different heights.

The support assembly 4 is provided with locking members 47, the number of the locking members 47 is the same as that of the support assembly 4, each locking member 47 comprises a rotating rod 471, a locking wheel 472 and a locking block 473, the rotating rod 471 is arranged between the two fixing frames 41 and is positioned above one side of the rotating shaft 42, the locking wheel 472 is arranged on the rotating shaft 42 and is positioned at one side of the first gear 44 and is connected with the rotating shaft 42, the locking block 473 is arranged on the rotating rod 471 and is connected with the rotating shaft 42, one end of the locking block 473 is provided with a grab handle 474, the other end of the locking block 473 is provided with a locking rod 475, when a person needs to adjust the support assembly 4 according to different heights in use, the handle rotates clockwise to synchronously drive the first gear 44 and the locking wheel 472 to descend, the locking rod 475 on the locking block 473 shakes up and down on the locking wheel 472, and when the person finishes adjusting the support assembly 4, make locking pole 475 fall into the tooth's socket of locking wheel 472, lock locking wheel 472 to make the more stable support of lifter 46 subaerial, support cabinet 1, when driving first gear 44 and locking wheel 472 to rise through handle 421 anticlockwise rotation in step, can hold grab handle 474 on the locking piece 473 and press downwards, make locking pole 475 on the locking piece 473 shift out from locking wheel 472, make handle 421 can drive pivot 42 and rotate.

Both sides of the first gear 44 and the second gear 45 are provided with a limiting sleeve 48, and the first gear 44 and the second gear 45 cannot deviate to influence the lifting of the lifting rod 46 when rotating through the limiting sleeve 48.

The two lifting assemblies 3 are respectively arranged at the upper end and the lower end of the first accommodating cavity 5, the two lifting assemblies 3 are respectively composed of two guide rods 31, a mounting plate 32, a bearing plate 33, a first rotating shaft 34, a second rotating shaft 35, a lifting motor 36 and a bevel gear 37, the two guide rods 31 are respectively symmetrically arranged in the first accommodating cavity 5, the mounting plate 32 is arranged on the two guide rods 31 and movably connected with the two guide rods 31, the bearing plate 33 is arranged in the first accommodating cavity 5 and is positioned below the mounting plate 32, the first rotating shaft 34 is arranged at the top end of the bearing plate 33, one end of the first rotating shaft 34 penetrates through the bearing plate 33 and is positioned at the inner side of the bearing plate 33, the second rotating shaft 35 is arranged on the first rotating shaft 34, and the first rotating shaft 34 is in threaded connection with the second rotating shaft 35, the top end of the second rotating shaft 35 is connected with the mounting plate 32, the lifting motor 36 is arranged at one side of the bearing plate 33, and the output terminal of the elevating motor 36 passes through the loading plate 33 and is located inside the loading plate 33, two bevel gears 37 are provided, the two bevel gears 37 are respectively provided on the output end of the lifting motor 36 and the first rotating shaft 34, and the two bevel gears 37 are meshed with each other, when in use, the lifting motor 36 is started to drive the bevel gears 37 to rotate clockwise, so that the two bevel gears 37 drive the first rotating shaft 34 to rotate under the meshing, since the first rotating shaft 34 is screwed with the second rotating shaft 35, the first rotating shaft 34 drives the second rotating shaft 35 to ascend, the second rotating shaft 35 drives the mounting plate 32 to ascend, when the lifting motor 36 rotates counterclockwise, the mounting plate 32 can be driven to descend by the second rotating shaft 35, therefore, different parts can be arranged in the cabinet body 1 to adjust the installation space in the cabinet body 1.

The top end of the bearing plate 33 is provided with a bracket 331, the bracket 331 is arranged at the top end of the bearing plate 33, and one end of the bracket 331 passes through the second rotating shaft 35, so that the second rotating shaft 35 provides a stable lifting environment when ascending or descending.

The outside of the cabinet body 1 is equipped with dust screen 11, dust screen 11 is equipped with two, and two dust screens 11 are located the outside of two louvres respectively to two dust screens 11 are by the bolt fastening on the cabinet body 1, block through dust screen 11 the outside dust of the cabinet body 1 during the use, make the dust can't enter into the cabinet body 1 inside, after dust screen 11 stops the back to the outside dust for a long time, accessible personnel unscrew the bolt and dismantle cleanness to dust screen 11, extension dust screen 11's life.

First hold 5 inside negative pressure fan 51 that are equipped with in chamber negative pressure fan 51 is equipped with two, and two negative pressure fan 51 settings are in first chamber 5 that holds to two negative pressure fan 51 are located the inboard of louvre, and accessible negative pressure fan 51 is outside the heat discharge of the internal part dust production of the cabinet body 1 during the use, prevents that the heat of the internal part of the cabinet body 1 is too high, influences the use of part.

The working principle of the invention is as follows: when the cabinet body 1 is required to be installed on the ground with different heights or uneven ground, the door 61 can be opened and closed by a person, the handle 421 is shaken clockwise to drive the rotating shaft 42 to rotate, the rotating shaft 42 drives the first gear 44 to rotate, the two first gears 44 are meshed to drive the roller shaft 43 to rotate, the roller shaft 43 drives the second gear 45 to rotate, the second gear 45 can drive the lifting rod 46 to descend, the base at the lower end of the lifting rod 46 is used for supporting the cabinet body 1, when the handle 421 is shaken anticlockwise, the lifting rod 46 is driven to ascend through the second gear 45, so that the person can install the cabinet body 1 according to different heights, when the person needs to adjust the supporting component 4 according to different heights, the handle 421 can be rotated clockwise to synchronously drive the first gear 44 and the locking wheel 472 to descend, the locking rod 475 on the locking block 473 can shake up and down on the locking wheel 472, when the person finishes adjusting the support assembly 4, the locking rod 475 falls into the tooth socket of the locking wheel 472, the locking wheel 472 is locked, so that the lifting rod 46 can be more stably supported on the ground, the cabinet 1 is supported, when the handle 421 rotates counterclockwise to synchronously drive the first gear 44 and the locking wheel 472 to ascend, the person can hold the grab handle 474 on the locking block 473 to press downwards, the locking rod 475 on the locking block 473 moves out of the locking wheel 472, the handle 421 can drive the rotating shaft 42 to rotate, the lifting motor 36 is started to clockwise drive the bevel gears 37 to rotate, the two bevel gears 37 drive the first rotating shaft 34 to rotate under meshing, and the first rotating shaft 34 is in threaded connection with the second rotating shaft 35, so that the first rotating shaft 34 drives the second rotating shaft 35 to ascend, drive the mounting panel 32 by second axis of rotation 35 and rise, when elevator motor 36 anticlockwise rotation, accessible second axis of rotation 35 drives the mounting panel 32 and descends to can adjust the installation space in the cabinet body 1 to the different part sizes of cabinet body 1 internally mounted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a power distribution cabinet, its characterized in that, includes the cabinet body (1), cabinet door (2), lifting unit (3) and supporting component (4), the cabinet body (1) sets up subaerial, and all establish the louvre on the both sides of the cabinet body (1), and the inside of the cabinet body (1) is equipped with first chamber (5) and the second of holding and holds chamber (6), and the second holds both sides department of chamber (6) and all is equipped with switch door (61), cabinet door (2) set up on one side of the cabinet body (1) and with cabinet door (2) hinge connection, lifting unit (3) set up in first chamber (5) that holds of the cabinet body (1), supporting component (4) set up the lower extreme of the cabinet body (1) and lie in the second holds chamber (6) to supporting component (4) are connected with the cabinet body (1).

2. The power distribution cabinet according to claim 1, wherein four support assemblies (4) are provided, the four support assemblies (4) are respectively arranged at the lower end of the cabinet body (1) and are fixedly connected with the cabinet body (1), each support assembly (4) is composed of two fixing frames (41), a rotating shaft (42), a roll shaft (43), a first gear (44), a second gear (45) and a lifting rod (46), the two fixing frames (41) are respectively and symmetrically arranged in the second accommodating cavity (6), the rotating shaft (42) is arranged on the two fixing frames (41), one end of the rotating shaft (42) penetrates through the fixing frames (41), a handle (421) is arranged on the rotating shaft (42) with one end penetrating through the fixing frames (41), the handle (421) is connected with the rotating shaft (42), the roll shaft (43) is arranged between the two fixing frames (41) and is positioned below the rotating shaft (42), the utility model discloses a lifting device, including first gear (44), first gear (44) and lifter (46), first gear (44) are equipped with two, two first gear (44) set up respectively on pivot (42) and roller (43), and two first gear (44) intermeshing, two first gear (44) are connected with pivot (42) and roller (43) respectively, second gear (45) set up on roller (43) and are located one side of first gear (44), and first gear (44) are connected with roller (43), lifter (46) are located one side of second gear (45), and lifter (46) are close to be equipped with a plurality of tooth's socket on second gear (45) one side and with second gear (45) intermeshing to the lower extreme of lifter (46) is equipped with the base and with lifter (46) fixed connection.

3. The power distribution cabinet according to claim 2, wherein the support assembly (4) is provided with locking members (47), the number of the locking members (47) is the same as that of the support assembly (4), each locking member (47) comprises a rotating rod (471), a locking wheel (472) and a locking block (473), the rotating rod (471) is arranged between the two fixing frames (41) and located above one side of the rotating shaft (42), the locking wheel (472) is arranged on the rotating shaft (42) and located on one side of the first gear (44) and connected with the rotating shaft (42), the locking block (473) is arranged on the rotating rod (471) and connected with the rotating shaft (42), one end of the locking block (473) is provided with a grab handle (474), and the other end of the locking block (475) is provided with a locking rod (473).

4. A switch board according to claim 2, characterized in that the first gear wheel (44) and the second gear wheel (45) are provided with a stop collar (48) on both sides.

5. The power distribution cabinet according to claim 1, wherein there are two lifting assemblies (3), two lifting assemblies (3) are respectively disposed at the upper end and the lower end of the first accommodating cavity (5), the lifting assemblies (3) are composed of two guide rods (31), a mounting plate (32), a bearing plate (33), a first rotating shaft (34), a second rotating shaft (35), a lifting motor (36) and a bevel gear (37), the two guide rods (31) are disposed, the two guide rods (31) are respectively disposed in the first accommodating cavity (5) symmetrically, the mounting plate (32) is disposed on the two guide rods (31) and movably connected with the two guide rods (31), the bearing plate (33) is disposed in the first accommodating cavity (5) and located below the mounting plate (32), the first rotating shaft (34) is disposed at the top end of the bearing plate (33), and one end of the first rotating shaft (34) penetrates through the bearing plate (33) and is positioned on the inner side of the bearing plate (33), the second rotating shaft (35) is arranged on the first rotating shaft (34), the first rotating shaft (34) is in threaded connection with the second rotating shaft (35), the top end of the second rotating shaft (35) is connected with the mounting plate (32), the lifting motor (36) is arranged on one side of the bearing plate (33), the output end of the lifting motor (36) penetrates through the bearing plate (33) and is positioned inside the bearing plate (33), two bevel gears (37) are arranged, the two bevel gears (37) are respectively arranged on the output end of the lifting motor (36) and the first rotating shaft (34), and the two bevel gears (37) are meshed with each other.

6. A switch board according to claim 5, characterized in that a bracket (331) is provided on the top end of the bearing plate (33), the bracket (331) is provided on the top end of the bearing plate (33), and one end of the bracket (331) passes through the second rotation shaft (35).

7. The power distribution cabinet according to claim 1, wherein two dust screens (11) are arranged on the outer side of the cabinet body (1), the two dust screens (11) are respectively located on the outer sides of the two heat dissipation holes, and the two dust screens (11) are fixed on the cabinet body (1) by bolts.

8. A switch board according to claim 1, characterized in that the first containing cavity (5) is internally provided with two negative pressure air blowers (51), the two negative pressure air blowers (51) are arranged in the first containing cavity (5), and the two negative pressure air blowers (51) are positioned at the inner side of the heat dissipation holes.