CN110456891B

CN110456891B - Computer mainframe heat dissipation and ventilation device

Info

Publication number: CN110456891B
Application number: CN201910621415.3A
Authority: CN
Inventors: 潘雷; 杨鹏; 胡兆方; 麻鹿环
Original assignee: Zhejiang Industry and Trade Vocational College
Current assignee: Zhejiang Industry and Trade Vocational College
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2021-01-12
Anticipated expiration: 2039-07-10
Also published as: CN110456891A

Abstract

The invention discloses a heat dissipation and ventilation device for a computer mainframe, which comprises a mainframe box and a base, wherein the lower part of the mainframe box is positioned in a groove on the base, a buffer heat dissipation device is arranged between the mainframe box and the bottom wall of the groove, the buffer heat dissipation device comprises a buffer component and a heat dissipation component, the buffer component comprises a plurality of springs and a plurality of rubber bodies which are arranged between the mainframe box and the groove, and the heat dissipation component comprises a plurality of driving mechanisms arranged between the mainframe box and the groove and a plurality of air nozzles positioned in the groove. The heat dissipation and ventilation device of the computer mainframe box provided by the invention has better buffering and heat dissipation effects due to the adoption of the structure.

Description

Computer mainframe heat dissipation and ventilation device

Technical Field

The invention relates to the technical field of computer parts, in particular to a heat dissipation and ventilation device for a computer mainframe.

Background

The computer case is used as one part of computer fittings, and has the main function of holding and fixing computer fittings to play a role in bearing and protecting, and the computer case has the important function of shielding electromagnetic radiation.

Chinese patent CN201810238063.9 discloses a heat dissipation and ventilation device for computer mainframe, which comprises a base, a first heat dissipation mesh, a mainframe, an AMD processor, function keys, a control panel, a small fan, a U-shaped groove, a through hole, a support, a shock absorber, a shock absorbing spring, a battery box, a nickel-hydrogen battery, a box cover, a handle, an air duct, a first switch valve, an air extractor, a condenser pipe, a condenser, an air inlet pipe, a second switch valve, a second heat dissipation mesh, a box door, a hinge, a heat collector, a connecting rod, a high temperature buffer board, a P-type semiconductor, an N-type semiconductor, a copper sheet, a switch button and a radiator.

Carry out the shock attenuation through setting up bumper shock absorber and spring to the bottom of mainframe box in the above-mentioned patent document, in the use, if when the internals of bumper shock absorber goes wrong, it is difficult to maintain the change, moreover, the spring easily takes place excessive deformation, make it lose shock-absorbing capacity, in addition, some radiating element who adopts in the above-mentioned patent document all just have the heat dissipation function after the circular telegram, therefore these radiating element also can give off the heat in the course of the work, the difference between the heat that gives off and the heat that is dispelled can't be confirmed, therefore it is more than the heat that radiating element dispels to probably lead to the heat that radiating element self gived off, this end is invertd.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a heat dissipation and ventilation device for a computer mainframe, which solves the problems of poor buffering effect and poor heat dissipation effect of the patent documents.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides a computer mainframe heat dissipation ventilation unit, includes mainframe box and base, the lower part of mainframe box is located in the recess on the base, wherein, the mainframe box with be equipped with buffering heat abstractor between the diapire of recess, buffering heat abstractor includes buffering subassembly and radiator unit, buffering subassembly is including setting up the mainframe box with a plurality of spring and a plurality of rubber body between the recess, radiator unit is including setting up the mainframe box with a plurality of actuating mechanism between the recess with be located a plurality of blast nozzle in the recess.

Furthermore, the chutes are respectively formed in two sides of the mainframe box, a plurality of upper guide posts are arranged on the upper side wall of each chute, one end of each spring is sleeved on the corresponding upper guide post, and the other end of each spring is sleeved on the corresponding lower guide post on the base on the bottom wall of the corresponding groove.

Further, the base still includes door type frame, door type frame's roof with the diapire of recess links to each other, the rubber body sets up the bottom of mainframe box with between door type frame's the roof, an organic whole is connected with interior folded plate on door type frame's the inboard, and a plurality of blast head sets up on the interior folded plate, the inboard of interior folded plate is connected with the baffle, baffle and the spout sliding fit that corresponds, the guide post sets up down on the upper end of baffle, the lower extreme of baffle can support to press on the lower lateral wall of the spout that corresponds, door type frame, a pair of interior folded plate with form a cavity between the bottom of mainframe box, a plurality of rubber body and a plurality of actuating mechanism all are located in the cavity.

Furthermore, the rubber body is provided with a base column, two ends of the base column are respectively provided with a circular truncated cone column, the large end of the circular truncated cone column is connected with the corresponding end part of the base column, the small end of the circular truncated cone column is provided with a drum-shaped bulge, a necking part is formed between the drum-shaped bulge and the corresponding circular truncated cone column, one drum-shaped bulge is connected with the bottom end of the mainframe box, and the other drum-shaped bulge is connected with the top plate of the door-shaped frame.

Furthermore, a supporting plate is embedded in the foundation column, a cavity is formed in the supporting plate to form a frame, the top plate of the frame and the bottom plate of the frame are both stretched inwards to form a plurality of trapezoidal grooves in the top surface of the top plate and the bottom surface of the bottom plate, and the two side plates of the frame are connected through a plurality of connecting rods.

Furthermore, be equipped with a plurality of ring carrier on the roof of door type frame, ring carrier is located the outside of the rubber body that corresponds, ring carrier includes the barrel, the bottom of barrel with the roof of door type frame links to each other, be equipped with a symmetrical annular hang plate on the inner wall of barrel, be equipped with O shape circle on the inner wall of annular hang plate, O shape circle cooperatees with the throat that corresponds.

Still further, the drive mechanism includes:

the driving rod is arranged at the bottom end of the mainframe box;

the rack is connected with the driving rod and is in sliding fit with the pair of guide seats positioned above the portal frame;

the first gear is arranged on the corresponding mounting plate in the cavity and is in meshed connection with the rack;

the pair of first sleeves are respectively positioned on the front side of the first gear and the rear side of the mounting plate, the first sleeves and the first gear are coaxially arranged, and a plurality of helical blades are arranged on the first sleeves;

the pair of second gears are respectively positioned at the upper side and the lower side of the first gear and are in meshed connection with the first gear;

the pair of second sleeves are respectively positioned on the front side of one second gear and the rear side of the mounting plate, the second sleeves and the one second gear are coaxially arranged, and a plurality of helical blades are arranged on the second sleeves;

the pair of third sleeves are respectively positioned on the front side of the other second gear and the rear side of the mounting plate, the third sleeves and the other second gear are coaxially arranged, and a plurality of helical blades are arranged on the third sleeves.

Furthermore, the inner folding plate is provided with a plurality of inclined through holes, the air-jet head is arranged at the upper opening of the inclined through holes, the air-jet head comprises a first cylinder, a second cylinder, a third cylinder, a first circular truncated cone, a fourth cylinder, a second circular truncated cone, a third circular truncated cone and a fourth circular truncated cone which are sequentially connected, the fourth circular truncated cone is positioned outside the inner folding plate, the small end of the fourth circular truncated cone extends towards the side wall of the mainframe box, the small end of the first circular truncated cone is connected with the third cylinder, the large end of the first circular truncated cone is connected with the fourth cylinder, the large end of the second circular truncated cone is connected with the fourth cylinder, the small end of the second circular truncated cone is connected with the large end of the third circular truncated cone, the small end of the third circular truncated cone is connected with the large end of the fourth circular truncated cone, and the first hole is arranged in the first cylinder, the second hole has been seted up in the second cylinder, first taper hole has been seted up in the third cylinder, third hole has been seted up in the first round platform, the fourth hole has been seted up in the fourth cylinder, the fifth hole has been seted up in the second round platform, second taper hole has been seted up in the third round platform, the third taper hole has been seted up in the fourth round platform, third taper hole, second taper hole, fifth hole, fourth hole, third hole, first taper hole, second hole and first hole intercommunication, the third taper hole is linked together with the external world, first hole with the slope is perforated and is linked together.

(III) advantageous effects

The invention has the beneficial effects that: because the buffering heat dissipation device is arranged in the invention and comprises the buffering component and the heat dissipation component, the bottom of the mainframe box can be buffered, the stability of the invention in operation is improved, and the heat emitted by the mainframe box can be dissipated, thereby improving the service performance of the invention.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is an enlarged view at I in fig. 1.

Fig. 3 is a cross-sectional view of a rubber body of the present invention.

Fig. 4 is an enlarged view at H in fig. 2.

Fig. 5 is an enlarged view at J in fig. 2.

In the drawings: the main chassis 10, the sliding groove 101, the upper guide post 1011, the base 20, the groove 201, the base 30, the lower guide post 301, the door-shaped frame 302, the inner folded plate 303, the inclined through hole 3031, the baffle 304, the cavity 40, the support plate 50, the cavity 501, the frame 502, the top plate 5021, the bottom plate 5022, the trapezoidal groove 5023, the side plate 5024, the connecting rod 5025, the annular support frame 60, the cylinder 601, the annular inclined plate 602, the O-ring 603, the guide seat 70, the mounting plate 80, the helical blade 90, the vertical plate 100, the spring 1, the rubber body 2, the base post 21, the circular pillar 22, the drum-shaped protrusion 23, the neck portion 24, the driving mechanism 3, the driving rod 31, the rack 32, the first gear 33, the first sleeve 34, the second gear 35, the second sleeve 36, the third sleeve 37, the air nozzle 4, the first cylinder 41, the first hole 411, the second cylinder 42, the second hole 421, the third cylinder 43, the first conical hole 431, the first circular pillar 44, the first circular pillar 441, A fourth column 45, a fourth hole 451, a second truncated cone 46, a fifth hole 461, a third truncated cone 47, a second taper hole 471, a fourth truncated cone 48, and a third taper hole 481.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention.

Referring to fig. 1 to 5, a heat dissipation and ventilation apparatus for a computer mainframe shown in fig. 1 includes a mainframe box 10 and a base 20, a lower portion of the mainframe box 10 is located in a groove 201 on the base 20, a buffering heat dissipation apparatus is disposed between the mainframe box 10 and a bottom wall of the groove 201, the buffering heat dissipation apparatus includes a buffering component and a heat dissipation component, the buffering component includes a plurality of springs 1 and a plurality of rubber bodies 2 disposed between the mainframe box 10 and the groove 201, the heat dissipation component includes a plurality of driving mechanisms 3 disposed between the mainframe box 10 and the groove 201 and a plurality of air nozzles 4 disposed in the groove 201, and since the buffering heat dissipation apparatus is disposed in the heat dissipation and ventilation apparatus for a computer mainframe box, the buffering heat dissipation apparatus includes a buffering component and a heat dissipation component, not only can buffer the bottom of the mainframe box 10, the stability of the invention in operation is improved, and the heat emitted by the mainframe box 10 can be dissipated, thereby improving the service performance of the computer mainframe heat dissipation and ventilation device.

As shown in fig. 2, the base 30 further includes a door-shaped frame 302, a top plate of the door-shaped frame 302 is connected to a bottom wall of the groove 201, the rubber body 2 is disposed between a bottom end of the main cabinet 10 and the top plate of the door-shaped frame 302, an inner folded plate 303 is integrally connected to an inner side of a side plate of the door-shaped frame 302, a plurality of air blowing heads 4 are disposed on the inner folded plate 303, a baffle 304 is connected to an inner side of the inner folded plate 303, sliding grooves 101 are respectively disposed on two sides of the main cabinet 10, the baffle 304 is in sliding fit with the corresponding sliding groove 101, a lower end of the baffle 304 can be pressed against a lower side wall of the corresponding sliding groove 101, a cavity 40 is formed between the door-shaped frame 302, the pair of inner folded plates 303 and the bottom end of the main cabinet 10, the plurality of rubber bodies 2 and the plurality of driving mechanisms 3 are all located in the cavity 40, a plurality of lower guide posts 301 are disposed on an upper end, be equipped with a plurality of guide post 1011 on the last lateral wall of spout 101, a pot head of spring 1 is established on corresponding last guide post 1011, another pot head of spring 1 is established on corresponding lower guide post 301.

As shown in fig. 3, the rubber body 2 has a base column 21, two ends of the base column 21 are respectively provided with a circular truncated cone 22, a large end of the circular truncated cone 22 is connected with a corresponding end of the base column 21, a small end of the circular truncated cone 22 is provided with a drum-shaped protrusion 23, a necking portion 24 is formed between the drum-shaped protrusion 23 and the corresponding circular truncated cone 22, one drum-shaped protrusion 23 is connected with a bottom end of the main chassis 10, and the other drum-shaped protrusion 23 is connected with a top plate of the door-shaped frame 302.

In this embodiment, a supporting plate 50 is embedded in the base pillar 21, a cavity 501 is formed in the supporting plate 50 to form a frame 502, a top plate 5021 of the frame 502 and a bottom plate 5022 of the frame 502 are both stretched inwards to form a plurality of trapezoid-shaped grooves 5023 on the top surface of the top plate 5021 and the bottom surface of the bottom plate 5022, two side plates 5024 of the frame 502 are connected through a plurality of connecting rods 5025, a plurality of annular supporting frames 60 are arranged on the top plate of the door-shaped frame 302, the annular supporting frames 60 are located on the outer sides of the corresponding rubber bodies 2, each annular supporting frame 60 comprises a cylinder 601, the bottom end of the cylinder 601 is connected with the top plate of the door-shaped frame 302, a pair of symmetrical annular inclined plates 602 is arranged on the inner wall of the cylinder 601, an O-shaped ring 603 is arranged on the inner wall of the annular inclined plates 602, and the O-shaped ring 603 is matched with the corresponding, because the embedded backup pad 50 that is equipped with of rubber body 2, backup pad 50 has increased the rigidity of foundation column 21, is equipped with a plurality of annular support frame 60 on the roof of door type frame 302, and annular support frame 60 can play the supporting role to the cydariform arch 23 to, can prevent that rubber body 2 from taking place excessive deformation, prolonged the life of rubber body 2, further prolonged the life of buffering subassembly, and then prolonged buffering heat abstractor's life.

As shown in fig. 4, the driving mechanism 3 includes a driving rod 31, a rack 32, a first gear 33, a pair of first sleeves 34, a pair of second gears 35, a pair of second sleeves 36, and a pair of third sleeves 37, the driving rod 31 is disposed at the bottom end of the main chassis 10, the rack 32 is connected to the driving rod 31, and the rack 32 is slidably fitted to a pair of guide seats 70 disposed above the gate frame 302, specifically, a plurality of vertical plates 100 are disposed on a top plate of the gate frame 302, each pair of guide seats 70 is mounted on the corresponding vertical plate 100, the first gear 33 is mounted on the corresponding mounting plate 80 disposed in the cavity 40, specifically, an outer side of the mounting plate 80 is connected to a side plate corresponding to the gate frame 302, an inner upper end of an inner side of the mounting plate 80 is connected to the corresponding inner flap 303, and an inner lower end of the mounting plate 80 is connected to a top plate of the gate frame 302, the first gear 33 is engaged with the rack 32, the pair of first sleeves 34 are respectively located on the front side of the first gear 33 and the rear side of the mounting plate 80, the first sleeves 34 are coaxially arranged with the first gear 33, the first sleeves 34 are provided with a plurality of helical blades 90, the pair of second gears 35 are respectively located on the upper and lower sides of the first gear 33, the second gear 35 is engaged with the first gear 33, the pair of second sleeves 36 are respectively located on the front side of one second gear 35 and the rear side of the mounting plate 80, the second sleeves 36 are coaxially arranged with the one second gear 35, the second sleeves 36 are provided with a plurality of helical blades 90, the pair of third sleeves 37 are respectively located on the front side of the other second gear 35 and the rear side of the mounting plate 80, the third sleeves 37 are coaxially arranged with the other second gear 35, the third sleeve 37 is provided with a plurality of helical blades 90.

In the present embodiment, the first sleeve 34, the second sleeve 36 and the third sleeve 37 are all limited on the front and back sides of the first gear 33 or the second gear 35 by nuts, and 3 helical blades 90 are arranged on the first sleeve 34, wherein an included angle between two adjacent helical blades 90 is 120 °; the second sleeve 36 and the third sleeve 37 are provided with 6 helical blades 90, wherein the included angle between two adjacent helical blades 90 is 60 °, so as to avoid collision between the helical blades 90 on the first sleeve 34 and the helical blades 90 on the second sleeve 36 or the third sleeve 37.

In this embodiment, the plurality of rubber bodies 2 includes a plurality of pairs of rubber bodies 2, the plurality of driving mechanisms 3 includes a plurality of pairs of driving mechanisms 3, each pair of rubber bodies 2 and each pair of driving mechanisms 3 are disposed in parallel, and each pair of driving mechanisms 3 is located outside each pair of rubber bodies 2.

As shown in fig. 2 and 5, a plurality of inclined through holes 3031 are formed in the inner folded plate 303, the blowing head 4 is disposed at an upper opening of the inclined through hole 3031, the blowing head 4 includes a first cylinder 41, a second cylinder 42, a third cylinder 43, a first circular truncated cone 44, a fourth cylinder 45, a second circular truncated cone 46, a third circular truncated cone 47 and a fourth circular truncated cone 48, which are connected in sequence, the fourth circular truncated cone 48 is located outside the inner folded plate 303, a small end of the fourth circular truncated cone 48 extends toward a sidewall of the main chassis 10, a small end of the first circular truncated cone 44 is connected to the third cylinder 43, a large end of the first circular truncated cone 44 is connected to the fourth cylinder 45, a large end of the second circular truncated cone 46 is connected to the fourth cylinder 45, a small end of the second circular truncated cone 46 is connected to a large end of the third circular truncated cone 47, and a small end of the third circular truncated cone 47 is connected to a large end of the fourth circular truncated cone 48, the first cylinder 41 is internally provided with a first hole 411, the second cylinder 42 is internally provided with a second hole 421, the third cylinder 43 is internally provided with a first taper hole 431, the first truncated cone 44 is internally provided with a third hole 441, the fourth cylinder 45 is internally provided with a fourth hole 451, the second truncated cone 46 is internally provided with a fifth hole 461, the third truncated cone 47 is internally provided with a second taper hole 471, the fourth truncated cone 48 is internally provided with a third taper hole 481, the second taper hole 471, the fifth hole 461, the fourth hole 451, the third hole 441, the first taper hole 431, the second hole 421 and the first hole 411 are communicated, the third taper hole 481 is communicated with the outside, and the first hole 411 is communicated with the inclined through hole 3031.

In this embodiment, the diameter of the first cylinder 41 is larger than that of the second cylinder 42, the diameter of the second cylinder 42 is larger than that of the fourth cylinder 45, the diameter of the fourth cylinder 45 is larger than that of the third cylinder 43, the diameter of the first hole 411 is larger than that of the second hole 421, the diameter of the second hole 421 is larger than that of the third hole 441, the diameter of the third hole 441 is equal to that of the fourth hole 451 and that of the fifth hole 461, the diameter of the second hole 421 is larger than that of the large end of the first tapered hole 431, the diameter of the small end of the first tapered hole 431 is equal to that of the third hole 441, the diameter of the large end of the second tapered hole 471 is equal to that of the fifth hole 461, the diameter of the small end of the second tapered hole 471 is equal to that of the large end of the third tapered hole 481, thereby gradually reducing the diameter of the flow path of the air current, and thus maximizing the speed of the air current flowing out of the third taper hole 481, so that the heat dissipated by the main chassis 10 can be effectively dissipated.

In this embodiment, the inner wall surface of the outlet end of the inclined through hole 3031 is fitted to the outer periphery of the nozzle 4, and the included angle between the inclined through hole 3031 and the axis of the base 30 is 8 ° to 10 °, in which the flow velocity of the air flow ejected from the nozzle 4 is the largest, so that the heat dissipated by the main chassis 10 is dissipated more quickly.

In the above-mentioned structure, when mainframe box 10 takes place vibrations, can make spring 1 and the rubber body 2 take place deformation, thereby cushion the bottom of mainframe box 10, and when mainframe box 10 took place to remove, can drive rack 32 and remove, and then drive first gear 33 and a pair of second gear 35 and rotate, thereby make first sleeve 34, second sleeve 36 and third sleeve 37 take place to rotate, make helical blade 90 rotate, the air current that will blow blows the side of blowing head 4 to mainframe box 10, dissipate the heat that mainframe box 10 gived off.

It should be noted that the described embodiments of the invention are only preferred ways of implementing the invention, and that all obvious modifications, which are within the scope of the invention, are all included in the present general inventive concept.

Claims

1. The utility model provides a computer mainframe heat dissipation and ventilation device, includes mainframe box (10) and base (20), the lower part of mainframe box (10) is located recess (201) on base (20), its characterized in that, mainframe box (10) with be equipped with buffering heat abstractor between the diapire of recess (201), buffering heat abstractor includes buffering subassembly and radiator unit, buffering subassembly including setting up mainframe box (10) with a plurality of spring (1) and a plurality of rubber body (2) between recess (201), radiator unit is including setting up a plurality of actuating mechanism (3) between mainframe box (10) and recess (201) and being located a plurality of blast nozzle (4) in recess (201), spout (101) have been seted up respectively to the both sides of mainframe box (10), be equipped with on the last guide post (1011) of a plurality of on the last lateral wall of spout (101), one end of the spring (1) is sleeved on the corresponding upper guide post (1011), the other end of the spring (1) is sleeved on the corresponding lower guide post (301) on the base (30) positioned on the bottom wall of the groove (201), the base (30) further comprises a door-shaped frame (302), the top plate of the door-shaped frame (302) is connected with the bottom wall of the groove (201), the rubber body (2) is arranged between the bottom end of the main case (10) and the top plate of the door-shaped frame (302), the inner side of the side plate of the door-shaped frame (302) is integrally connected with an inner folded plate (303), a plurality of air injection heads (4) are arranged on the inner folded plate (303), the inner side of the inner folded plate (303) is connected with a baffle plate (304), the baffle plate (304) is in sliding fit with the corresponding sliding groove (101), the lower guide post (301) is arranged on the upper end of the baffle plate (304), the lower end of the baffle (304) can be pressed against the lower side wall of the corresponding chute (101), a cavity (40) is formed between the door-shaped frame (302), the pair of inner folding plates (303) and the bottom end of the main case (10), the plurality of rubber bodies (2) and the plurality of driving mechanisms (3) are all positioned in the cavity (40), the rubber body (2) is provided with a base column (21), two ends of the base column (21) are respectively provided with a circular table column (22), the big end of the circular truncated cone column (22) is connected with the corresponding end part of the base column (21), a drum-shaped bulge (23) is arranged at the small end of the circular table column (22), a necking part (24) is formed between the drum-shaped bulge (23) and the corresponding circular table column (22), wherein one crowning (23) is connected with the bottom end of the main case (10), and the other crowning (23) is connected with the top plate of the door-shaped frame (302).

2. The heat dissipation and ventilation device for the computer mainframe box according to claim 1, wherein a supporting plate (50) is embedded in the base column (21), a cavity (501) is formed in the supporting plate (50) to form a frame (502), a top plate (5021) of the frame (502) and a bottom plate (5022) of the frame (502) both form a plurality of trapezoidal grooves (5023) on the top surface of the top plate (5021) and the bottom surface of the bottom plate (5022) by inward stretching, and two side plates (5024) of the frame (502) are connected through a plurality of connecting rods (5025).

3. The heat dissipation and ventilation device for the computer mainframe according to claim 2, wherein a plurality of annular support frames (60) are arranged on the top plate of the door-shaped frame (302), the annular support frames (60) are located at the outer sides of the corresponding rubber bodies (2), each annular support frame (60) comprises a cylinder (601), the bottom end of each cylinder (601) is connected with the top plate of the door-shaped frame (302), a pair of symmetrical annular inclined plates (602) are arranged on the inner wall of each cylinder (601), an O-shaped ring (603) is arranged on the inner wall of each annular inclined plate (602), and the O-shaped rings (603) are matched with the corresponding necking parts (24).

4. The heat dissipation and ventilation device for computer mainframe according to claim 3, wherein the driving mechanism (3) comprises:

a driving rod (31), the driving rod (31) being disposed on a bottom end of the main chassis (10);

the rack (32), the rack (32) is connected with the driving rod (31), and the rack (32) is in sliding fit with a pair of guide seats (70) positioned above the door-shaped frame (302);

a first gear (33), wherein the first gear (33) is arranged on a corresponding mounting plate (80) positioned in the cavity (40), and the first gear (33) is meshed with the rack (32);

the pair of first sleeves (34) are respectively positioned on the front side of the first gear (33) and the rear side of the mounting plate (80), the first sleeves (34) and the first gear (33) are coaxially arranged, and a plurality of spiral blades (90) are arranged on the first sleeves (34);

a pair of second gears (35), wherein the pair of second gears (35) are respectively positioned at the upper side and the lower side of the first gear (33), and the second gears (35) are in meshed connection with the first gear (33);

the pair of second sleeves (36) are respectively positioned on the front side of one second gear (35) and the rear side of the mounting plate (80), the second sleeves (36) and the second gear (35) are coaxially arranged, and a plurality of spiral blades (90) are arranged on the second sleeves (36);

the pair of third sleeves (37), a pair of third sleeves (37) are located the front side of another second gear (35), the rear side of mounting panel (80) respectively, third sleeve (37) and another second gear (35) coaxial arrangement, be equipped with a plurality of helical blade (90) on third sleeve (37).

5. The heat dissipation and ventilation device for the computer mainframe box according to claim 1, wherein a plurality of inclined through holes (3031) are formed in the inner folding plate (303), the air blowing head (4) is arranged at the upper opening of the inclined through holes (3031), the air blowing head (4) comprises a first cylinder (41), a second cylinder (42), a third cylinder (43), a first circular platform body (44), a fourth cylinder (45), a second circular platform body (46), a third circular platform body (47) and a fourth circular platform body (48) which are sequentially connected, the fourth circular platform body (48) is positioned outside the inner folding plate (303), the small end of the fourth circular platform body (48) extends to the side wall of the mainframe box (10), the small end of the first circular platform body (44) is connected with the third cylinder (43), the large end of the first circular platform body (44) is connected with the fourth cylinder body (45), the big end of the second circular truncated cone (46) is connected with the fourth cylinder (45), the small end of the second circular truncated cone (46) is connected with the big end of the third circular truncated cone (47), the small end of the third circular truncated cone (47) is connected with the big end of the fourth circular truncated cone (48), a first hole (411) is formed in the first cylinder (41), a second hole (421) is formed in the second cylinder (42), a first taper hole (431) is formed in the third cylinder (43), a third hole (441) is formed in the first circular truncated cone (44), a fourth hole (451) is formed in the fourth cylinder (45), a fifth hole (461) is formed in the second circular truncated cone (46), a second taper hole (471) is formed in the third circular truncated cone (47), a third taper hole (481) is formed in the fourth circular truncated cone (48), and a third taper hole (481) is formed in the third taper hole (481), The second taper hole (471), the fifth hole (461), the fourth hole (451), the third hole (441), the first taper hole (431), the second hole (421) and the first hole (411) are communicated, the third taper hole (481) is communicated with the outside, and the first hole (411) is communicated with the inclined through hole (3031).