CN113873810A

CN113873810A - High-efficient monitoring host is used in thing networking security protection

Info

Publication number: CN113873810A
Application number: CN202111177043.3A
Authority: CN
Inventors: 张飞
Original assignee: Shenzhen Yingtai Intelligent System Co ltd
Current assignee: Shenzhen Yingtai Intelligent System Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2021-12-31
Anticipated expiration: 2041-10-09
Also published as: CN113873810B

Abstract

The invention discloses a high-efficiency monitoring host for security protection of the Internet of things, which relates to the field of security protection monitoring and comprises a host, wherein a mounting plate is arranged in the host, a plurality of groups of main boards and instruments are arranged on the inner wall of the mounting plate, a partition plate is arranged at the bottom end of the host, air inlet plates are arranged on two sides of the partition plate and are inclined planes, the highest end of each air inlet plate is fixed on the outer side of the partition plate, a plurality of groups of rotating plates are arranged on the inner wall of each air inlet plate, and rotating shafts are arranged at two ends of each rotating plate. According to the invention, through the arrangement of the screen, the air inlet plate and the air exchange fan, the outside air can be sent into the air inlet plate through the air exchange fan, so that the rotating plate in the air inlet plate is pushed open, the air flow can normally enter the host, the air is filtered through the screen, the dust is prevented from entering the host, the air is filtered, the use effect is improved, and the problem that the dust is easy to enter the host is effectively solved.

Description

High-efficient monitoring host is used in thing networking security protection

Technical Field

The invention relates to the field of security monitoring, in particular to an efficient monitoring host for security of the Internet of things.

Background

The safety protection system aims at maintaining social public safety, and utilizes an intrusion alarm system, a video security monitoring system, an entrance and exit control system, a BSV liquid crystal splicing wall system, an entrance guard fire-fighting system, an explosion-proof safety inspection system and the like which are formed by safety protection products and other related products; or the systems are subsystem combined or integrated electronic systems or networks, the most critical of the security system is a monitoring system, and the monitoring system usually adopts a monitoring host to regulate and control a plurality of groups of monitoring cameras, so that the security place is comprehensively covered.

Therefore supervisory equipment is the operation of the whole time quantum of basic upper position when using, at the monitoring host operation in-process, because reasons such as internal resistance, can lead to monitoring host temperature to rise, too high temperature can influence monitoring host normal operating, consequently, need dispel the heat to the monitoring host, but current heat dissipation equipment sends into the monitoring host with external air usually, exchange the heat through the air current, in the radiating process, the fan is also synchronous send into the monitoring host with external dust very easily, lead to the dust to cover on each group's consumer in the host computer, thereby the operation of interference equipment.

Disclosure of Invention

Based on the technical problem, the invention aims to provide the efficient monitoring host for the security of the Internet of things, so as to solve the technical problem that dust easily enters the host.

In order to achieve the purpose, the invention provides the following technical scheme: a high-efficiency monitoring host for security protection of the Internet of things comprises a host, wherein a mounting plate is arranged in the host, a plurality of groups of main boards and instruments are arranged on the inner wall of the mounting plate, a partition plate is arranged at the bottom end of the host, air inlet plates are arranged on two sides of the partition plate and are inclined planes, the highest end of each air inlet plate is fixed on the outer side of the partition plate, a plurality of groups of rotating plates are arranged on the inner wall of each air inlet plate, rotating shafts are arranged at two ends of each rotating plate, each rotating plate rotates with the corresponding air inlet plate through the corresponding rotating shaft, two groups of pulling-out boxes are arranged in the host, the end parts of each group of pulling-out boxes are aligned and attached to the lowest end of the corresponding air inlet plate, a screen is arranged above the corresponding air inlet plate and is positioned under the mounting plate, a motor is arranged in the partition plate, two sides of the motor are positioned under the corresponding air inlet plates and are connected with a support frame, and the end parts of each group of the support frame are connected with a ventilation fan, the bottom end of the ventilation fan is connected with a transmission mechanism.

Through adopting above-mentioned technical scheme, can be convenient cool off each group's mainboard in the host computer, and can connect the dust in the air current through the screen cloth, avoid the dust to pile up in the mainboard outside.

The invention is further arranged in such a way that the bottom end of the host machine is provided with supporting legs, the control equipment is arranged inside the host machine and positioned on both sides of the mounting plate, the control equipment is communicated with the main board on the mounting plate and the instrument through a wire, and the end part of the control equipment is provided with a joint extending to the outer side of the host machine.

By adopting the technical scheme, the main machine and the desktop keep a certain distance, so that gas can smoothly enter the main machine conveniently.

The dust-proof device is further arranged in such a way that a top end ventilation box is installed at the top end of the main machine, an opening communicated with the top end ventilation box is formed in the top end of the main machine, a plurality of groups of filter screens are arranged on the outer side of the top end ventilation box, dust-proof plates are connected to the outer sides of each group of filter screens, and the rotation directions of the dust-proof plates are outward.

Through adopting above-mentioned technical scheme, make the convenient discharge outside the host computer of air that enters into in the host computer to avoid external dust to enter into the host computer through the dust board.

The invention is further set in that the width of the rotating plate on each group of air inlet plates is gradually reduced from top to bottom, the rotating highest point of each group of rotating plates is positioned on the same straight line and below the screen, a baffle is arranged on one side of the screen close to the pull-out box and can be attached to the rotating plate with the widest width, two ends of the rotating plate are provided with symmetrical sealing slots, and the rotating plate is connected with the air inlet plates in a clamping manner through the sealing slots.

Through adopting above-mentioned technical scheme, can be through the rotation and the baffle laminating of changeing the board to sealed the pull-out box, avoid when cooling off the host computer, the air current enters into the pull-out box, leads to the dust to be blown by the air current.

The invention is further arranged in that a transmission mechanism at the bottom end of the ventilation fan is composed of ratchet rings, a rotary table and clamping teeth, the rotary table is fixed at the bottom end of the ventilation fan, the clamping teeth are arranged on the side wall of the rotary table and are connected with ratchet wheels on the inner wall of the ratchet rings in a clamping manner, return springs are arranged at the connecting positions of the clamping teeth and the rotary table, baffle plates are connected with the top end and the bottom end of the rotary table, the rotary table is connected with the ratchet rings in a clamping manner through the baffle plates, a belt is connected with the outer side of the output end of the motor, the motor is connected with the two groups of ratchet rings in a transmission manner through the belt, and the ratchet directions of the inner walls of the two groups of ratchet rings are opposite.

Through adopting above-mentioned technical scheme, can make two sets of ventilation fans rotate in step, another a set of shutdown in a set of pivoted to through motor cycle's positive and negative rotation, make that the fan can last provide the air current to the host computer inside, thereby both can be convenient dispel the heat to the host computer, and clear up the impurity of piling up in the screen cloth outside.

The invention is further arranged in such a way that a splitter plate is arranged in the main machine and positioned below the mounting plate, the splitter plate is V-shaped, the center of the splitter plate is positioned right above the partition plate, the inner wall of the splitter plate is provided with a plurality of groups of breathable nets, and each group of breathable nets is positioned right below the mounting plate.

Through adopting above-mentioned technical scheme, the flow distribution plate can change the air current direction that enters into in the host computer, makes on partial air current enters into the inlet plate that another group admitted air to clear up the impurity of piling up on the screen cloth, make things convenient for impurity to enter into in the pull-out box.

The invention is further arranged in such a way that the two sides of the mounting plate are both provided with outer side plates, the mounting plate is mounted inside the main machine through the outer side plates, the inner wall of the mounting plate is provided with a plurality of groups of fixing holes, and an external main plate and an instrument are fixed outside the mounting plate through the fixing holes and bolts.

Through adopting above-mentioned technical scheme, can fix each group's mainboard and instrument through the mounting panel convenience.

The invention is further provided that the outer side of the pull-out box is provided with a handle, and one end of the inner wall of the pull-out box, which is close to the air inlet plate, is not provided with a baffle plate.

Through adopting above-mentioned technical scheme, conveniently pull out the box, and make things convenient for impurity to enter into and pull out the box.

In summary, the invention mainly has the following beneficial effects:

1. according to the invention, through the arrangement of the screen, the air inlet plate and the air exchange fan, the outside air can be sent into the air inlet plate through the air exchange fan, so that the rotating plate in the air inlet plate is pushed open, the air flow can normally enter the host, the air is filtered through the screen, the dust is prevented from entering the host, the air is filtered, the use effect is improved, and the problem that the dust is easy to enter the host is effectively solved.

2. According to the invention, through the arranged air inlet plate, the motor, the ventilation fan, the ratchet rings and the rotary table, when the host machine is cooled, the motor is periodically rotated in a positive and negative direction, the motor is periodically driven by the belt to rotate the two groups of ratchet rings inside, the two groups of ratchet rings are arranged in opposite rotating directions, so that when one group of ventilation fan rotates, the other group of ventilation fan does not rotate, the impurities on the filter screen fall onto the air inlet plate while the air is continuously introduced into the host machine, and the dust enters the pull-out box under the push of the gravity and the airflow separated by the flow distribution plate, so that the dust can be conveniently cleaned and recovered, the dust is prevented from being blocked outside the filter screen, the heat dissipation of the host machine is not cut off, and the use efficiency is improved.

3. According to the invention, the baffle is arranged on the outer side of the screen, and the rotating plates are jacked up by airflow when the host machine is subjected to heat dissipation, wherein one group of rotating plates rotate to be attached to the baffle, so that the pull-out box is shielded, the phenomenon that dust is blown due to the fact that the entering airflow enters the pull-out box is avoided, and the generation of raised dust is reduced.

Drawings

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

FIG. 2 is a schematic cross-sectional view of a mainframe according to the present invention;

FIG. 3 is an enlarged view of a portion of the structure at A in FIG. 2 according to the present invention;

FIG. 4 is a schematic diagram of a mounting plate structure according to the present invention;

FIG. 5 is a schematic view of the construction of the manifold of the present invention;

FIG. 6 is a schematic view of the structure of the air intake plate and the pull-out box of the present invention;

FIG. 7 is a schematic view of a rotating plate structure according to the present invention;

FIG. 8 is a schematic top view of a bottom end of the host of the present invention;

FIG. 9 is a schematic view of a one-way bearing configuration of the present invention;

FIG. 10 is a schematic view of a latch mounting arrangement of the present invention;

fig. 11 is a side sectional view of the latch according to the present invention.

In the figure: 1. a host; 101. supporting legs; 102. a control device; 103. screening a screen; 104. a partition plate; 2. pulling out the box; 3. a top end ventilation box; 301. a dust blocking plate; 302. filtering with a screen; 4. an air intake plate; 401. rotating the plate; 402. a rotating shaft; 403. sealing the slot; 5. a motor; 501. a belt; 502. a support frame; 6. a ventilation fan; 601. a ratchet ring; 602. a turntable; 603. clamping teeth; 604. a return spring; 7. a flow distribution plate; 701. a breathable net; 8. mounting a plate; 801. an outer panel; 802. and (7) fixing holes.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The following describes an embodiment of the present invention based on its overall structure.

The utility model provides a high-efficient control host computer is used in thing networking security protection, as shown in fig. 1 to 11, including host computer 1, supporting legs 101 have been seted up to host computer 1's bottom, host computer 1's internally mounted has mounting panel 8, and the inner wall of mounting panel 8 installs multiunit mainboard and instrument, control device 102 is all installed to the inside both sides that are located mounting panel 8 of host computer 1, and control device 102 is put through with the mainboard and the instrument on the mounting panel 8 through the wire, the tip of control device 102 is seted up the joint that extends to the host computer 1 outside, host computer 1's bottom is seted up baffle 104, inlet plate 4 has all been seted up to the both sides of baffle 104, the internally mounted of baffle 104 has motor 5, the both sides of motor 5 are located the below of inlet plate 4 and are connected with support frame 502, and the end connection of every support frame 502 has ventilator 6, ventilator 6's bottom is connected with drive mechanism, drive mechanism is by ratchet ring 601, The rotary table 602 and the latch 603, the rotary table 602 is fixed at the bottom end of the ventilation fan 6, the latch 603 is installed on the side wall of the rotary table 602 and is connected with the ratchet wheel of the inner wall of the ratchet ring 601 in a clamping manner, the return spring 604 is installed at the joint of the latch 603 and the rotary table 602, the top end and the bottom end of the rotary table 602 are both connected with a baffle plate, the rotary table 602 is connected with the ratchet ring 601 in a clamping manner through the baffle plate, the outer side of the output end of the motor 5 is connected with the belt 501, the motor 5 is connected with the two sets of ratchet rings 601 through the belt 501 in a transmission manner, the ratchet wheel directions of the inner walls of the two sets of ratchet rings 601 are opposite, when the host machine is subjected to heat dissipation, firstly, the motor 5 is connected with an external power supply, the motor 5 is operated to drive the belt 501, the belt 501 drives the ventilation fan 6 to rotate through the ratchet rings 601 and the rotary table 602, the ventilation fan 6 sends external air into the host machine 1 to dissipate heat of the equipment in the host machine 1, the air inlet plate 4 is an inclined plane, the highest end of the air inlet plate 4 is fixed on the outer side of the partition plate 104, a plurality of groups of rotating plates 401 are installed on the inner wall of the air inlet plate 4, rotating shafts 402 are arranged at two ends of each rotating plate 401, the rotating plates 401 rotate with the air inlet plate 4 through the rotating shafts 402, two groups of pulling-out boxes 2 are installed inside the main machine 1, the end part of each group of pulling-out boxes 2 is aligned and jointed with the lowest end of one group of air inlet plate 4, the main machine 1 is positioned above the air inlet plate 4 and is provided with a screen 103, the screen 103 is positioned under the mounting plate 8, the width of the rotating plate 401 on each group of air inlet plates 4 is gradually reduced from top to bottom, the rotating highest point of each group of rotating plates 401 is positioned on the same straight line and below the screen 103, one side of the screen 103, which is close to the pulling-out box 2, is provided with a baffle plate which can be jointed with the rotating plate 401 with the widest width, two ends of the rotating plates 401 are provided with symmetrical sealing slots 403, the rotating plates 401 are clamped and connected with the air inlet plates 4 through the sealing slots 403, the airflow does not enter the air inlet plate 4, the rotating plate 401 rotates around the rotating shaft 402 under the action of gravity, so that the rotating plate 401 is fixed on the air inlet plate 4 through the sealing slot 403, the air inlet plate 4 is sealed, the impurity and dust attached to the filter screen 302 falls on the air inlet plate 4 and slides down along with the air inlet plate 4 to enter the pulling box 2, so that the impurity is recovered, the splitter plate 7 is arranged below the mounting plate 8 inside the host 1, the splitter plate 7 is V-shaped, the center of the splitter plate 7 is positioned right above the partition plate 104, the inner wall of the splitter plate 7 is provided with a plurality of groups of breathable nets 701, each group of breathable nets 701 is positioned right below the mounting plate 8, the ventilation fan 6 on the other side of the partition plate 104 rotates to cool the host 1 while recovering the dust, the airflow enters the host 1 and is intercepted by the splitter plate 7, part of the airflow is blown into the air inlet plate 4 from top to bottom under the deflecting action of the splitter plate 7, the air current will be attached to the impurity on screen cloth 103 and blow down, and blow in impurity in drawing-out box 2, the ventilative box 3 in top is installed on the top of host computer 1, the opening of putting through with the ventilative box 3 in top is seted up on the top of host computer 1's top, multiunit filter screen 302 has been seted up in the outside of the ventilative box 3 in top, and the outside of every group filter screen 302 all is connected with ash baffle 301, ash baffle 301's direction of rotation is outwards, the air current that has the heat gets into in the ventilative box 3 in top, and pass filter screen 302 with ash baffle 301 jack-up, discharge the host computer 1 outside side, thereby conveniently dispel the heat to host computer 1, and avoid the dust to enter into in the equipment.

Referring to fig. 4, both sides of the mounting plate 8 are provided with outer plates 801, the mounting plate 8 is mounted inside the host 1 through the outer plates 801, the inner wall of the mounting plate 8 is provided with a plurality of sets of fixing holes 802, and the external motherboard and the instrument are fixed outside the mounting plate 8 through the fixing holes 802 and bolts, so that the instrument can be conveniently mounted.

Referring to fig. 1 and 2, a handle is installed at the outer side of the pull-out box 2, and a baffle is not disposed at one end of the inner wall of the pull-out box 2 close to the air inlet plate 4, so that the pull-out box 2 can be conveniently pulled out, and dust can conveniently enter the pull-out box 2.

The working principle of the invention is as follows: firstly, each group of mainboard and instruments in the monitoring host are installed, the mainboard and the instruments are installed on an installation plate 8 according to monitoring requirements, the mainboard and the instruments are fixed through bolts and fixing holes 802, the installation of the host is completed, when the monitoring host is used, the monitoring host is firstly connected with an external monitoring camera and a power supply through leads, so that the monitoring host can normally run, the mainboard and other instruments can generate a large amount of heat in the running process of the monitoring host, at the moment, the motor 5 is started, the motor 5 rotates forwards and backwards in a period, the output end of the motor 5 drives the belt 501 to rotate, the belt 501 drives the ratchet rings 601 at the bottom ends of the two groups of ventilation fans 6 to rotate, the ratchet rings 601 push the clamping teeth 603 to rotate through the internal tooth sockets, the clamping teeth 603 drive the rotary disc 602 to rotate, the rotary disc 602 drives the ventilation fans 6 to rotate, and the tooth sockets in the two groups of ratchet rings 601 are arranged in opposite directions, when the two groups of ratchet rings 601 are driven by the same group of belts 501, only one group of ratchet rings can normally drive the internal rotary table 602, the other group of rotary table 602 normally rotates, and the motor 5 rotates forwards and backwards periodically, so that the two groups of ventilation fans 6 can be started intermittently, and heat dissipation can be continuously performed on the interior of the host 1, when the ventilation fans 6 rotate, external air can be sent to the lower part of the air inlet plate 4 corresponding to the upper part of the ventilation fans, the air flow jacks up the rotary plate 401, the air flow enters the upper part of the air inlet plate 4 and passes through the screen 103 to enter the interior of the host 1, the screen 103 is located below the mounting plate 8, so that the air flow can take out heat generated by a main board and an instrument, hot air enters the top ventilation box 3, the air flow jacks up a plurality of dust baffles 301 arranged on the top ventilation box 3, and the air flow carries the heat to be discharged, and the heat dissipation can be performed on the interior of the host 1;

and in the heat dissipation process, the ventilating fans 6 are started in turn at intervals, when the ventilating fans 6 are not started, the air flow does not enter the air inlet plate 4, the rotating plate 401 rotates around the rotating shaft 402 under the action of gravity, so that the rotating plate 401 is fixed on the air inlet plate 4 through the sealing slot 403, the air inlet plate 4 is sealed, the impurity and dust attached to the filter screen 302 falls on the air inlet plate 4 and slides downwards along with the air inlet plate 4 to enter the pull-out box 2, so that the impurities are recovered, and when the dust is recovered, the ventilating fans 6 on the other side of the partition plate 104 rotate to cool the inside of the main machine 1, the air flow is intercepted by the splitter plate 7 after entering the main machine 1, part of the air flow blows downwards onto the air inlet plate 4 for dust recovery under the deflecting action of the splitter plate 7, the air flow blows down the impurities attached to the screen 103 and blows the impurities into the pull-out box 2, so that the dust can be conveniently recovered, the use efficiency is improved;

and when host computer 1 cools off, the air current is to blowing commentaries on classics board 401 and rotate, changes board 401 and keeps vertical upwards under the promotion of air current, wherein the baffle laminating of a set of commentaries on classics board 401 of longest and screen cloth 103 one side to 2 insides seal the pulling-out box, avoid the air current to enter into and blow up accumulational dust in the pulling-out box 2, reduce the raise dust.

Although embodiments of the present invention have been shown and described, it is intended that the present invention should not be limited thereto, that the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples, and that modifications, substitutions, variations or the like, which are not inventive and may be made by those skilled in the art without departing from the principle and spirit of the present invention and without departing from the scope of the claims.

Claims

1. The utility model provides a thing networking security protection is with high-efficient monitoring host computer, includes host computer (1), its characterized in that: the portable air purifier is characterized in that a mounting plate (8) is mounted inside the host (1), a plurality of groups of main boards and instruments are mounted on the inner wall of the mounting plate (8), a partition plate (104) is arranged at the bottom end of the host (1), air inlet plates (4) are arranged on two sides of the partition plate (104), the air inlet plates (4) are inclined planes, the highest ends of the air inlet plates (4) are fixed outside the partition plate (104), a plurality of groups of rotating plates (401) are mounted on the inner wall of the air inlet plates (4), rotating shafts (402) are arranged at two ends of each rotating plate (401), each rotating plate (401) rotates with the corresponding air inlet plate (4) through the corresponding rotating shaft (402), two groups of pulling-out boxes (2) are mounted inside the host (1), the end portions of each group of pulling-out boxes (2) are aligned and attached to the lowest ends of the corresponding group of the corresponding air inlet plates (4), the host (1) is located above the air inlet plates (4) and provided with a screen (103), and screen cloth (103) are located under mounting panel (8), the internally mounted of baffle (104) has motor (5), the below that the both sides of motor (5) are located air inlet plate (4) is connected with support frame (502), and the end connection of every group support frame (502) has ventilation fan (6), the bottom of ventilation fan (6) is connected with drive mechanism.

2. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: supporting legs (101) have been seted up to the bottom of host computer (1), control device (102) are all installed to the both sides that the inside of host computer (1) is located mounting panel (8), and control device (102) pass through the mainboard and the instrument switch-on wire and mounting panel (8), and the tip of control device (102) is seted up and is extended to the joint in the host computer (1) outside.

3. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: the top end of the host (1) is provided with the top end ventilation box (3), the top end of the host (1) is provided with an opening communicated with the top end ventilation box (3), the outer side of the top end ventilation box (3) is provided with a plurality of groups of filter screens (302), the outer side of each group of filter screens (302) is connected with the ash blocking plate (301), and the rotation direction of the ash blocking plate (301) faces outwards.

4. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: every group change board (401) on air inlet plate (4) by last width under to and reduce gradually, and the peak after the rotation of every group changes board (401) is located same straight line and is located the below of screen cloth (103), the baffle has been seted up to one side that screen cloth (103) are close to pull-out box (2), and the baffle can laminate with the commentaries on classics board (401) of the widest width, sealed slot (403) of symmetry have all been seted up at the both ends of changeing board (401), change board (401) and be connected with air inlet plate (4) block through sealed slot (403).

5. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: the drive mechanism of ventilation fan (6) bottom comprises ratchet ring (601), carousel (602) and latch (603), the bottom at ventilation fan (6) is fixed in carousel (602), and latch (603) install the lateral wall at carousel (602) and be connected with the ratchet block of ratchet ring (601) inner wall, return spring (604) are installed to latch (603) and the junction of carousel (602), the top and the bottom of carousel (602) all are connected with the baffle, carousel (602) are connected with ratchet ring (601) block through the baffle, the output outside of motor (5) is connected with belt (501), motor (5) are connected with two sets of ratchet ring (601) transmissions through belt (501), and the ratchet opposite direction of two sets of ratchet ring (601) inner walls.

6. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: the novel air-permeable fan is characterized in that a splitter plate (7) is arranged below a mounting plate (8) in the main machine (1), the splitter plate (7) is V-shaped, the center of the splitter plate (7) is located right above a partition plate (104), multiple sets of air-permeable nets (701) are arranged on the inner wall of the splitter plate (7), and each set of air-permeable nets (701) are located right below the mounting plate (8).

7. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: outer panel (801) have all been seted up to the both sides of mounting panel (8), the inside at host computer (1) is installed through outer panel (801) in mounting panel (8), multiunit fixed orifices (802) have been seted up to the inner wall of mounting panel (8), and external mainboard and instrument pass through fixed orifices (802) and bolt fastening in the mounting panel (8) outside.

8. The efficient monitoring host machine for the security of the internet of things according to claim 1, characterized in that: the handle is installed on the outer side of the pull-out box (2), and a baffle is not arranged at one end, close to the air inlet plate (4), of the inner wall of the pull-out box (2).