CN112335975A

CN112335975A - Top ventilation method for helmet

Info

Publication number: CN112335975A
Application number: CN202011179831.1A
Authority: CN
Inventors: 朱学刚; 吴长生; 朱勇
Original assignee: Shanghai Hehui Safety Products Manufacture Co ltd
Current assignee: Shanghai Hehui Safety Products Manufacture Co ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-02-09
Anticipated expiration: 2040-10-29
Also published as: CN112335975B

Abstract

The invention belongs to the technical field of helmets and discloses a top ventilation method for a helmet.A top ventilation switch is arranged, when the top ventilation switch is closed, a second ventilation hole arranged at the top of a helmet body is in a ventilation state, ambient wind can enter the helmet body from the second ventilation hole, and then returns to the atmospheric environment through a first ventilation hole arranged at the rear part of the helmet body and a third ventilation hole arranged on the top ventilation switch in sequence; when the top ventilation switch is opened, ambient wind enters a gap between the top ventilation switch and the helmet body from two sides of the top ventilation switch, then is discharged from the third ventilation hole and forms negative pressure, and heat of the head is discharged through the first ventilation hole and the third ventilation hole in sequence under the action of the negative pressure. According to the invention, the air quantity and the air speed in the helmet body of the helmet are adjusted through the top ventilation switch, so that the balance between the temperature in the helmet and the temperature of people is realized, the limitation problem of fixing the ventilation holes is solved, the individual requirements of different audiences are met, and the wearing comfort of the helmet is ensured.

Description

Top ventilation method for helmet

Technical Field

The invention relates to the technical field of helmets, in particular to a top ventilation method for a helmet.

Background

The helmet is a harness for protecting the head and is an indispensable tool in people's traffic, wherein the air permeability is a key performance index of the helmet, and the helmet can ensure the dryness of the head during long-distance riding and bring comfort to a wearer so as to be better concentrated on riding.

The more or larger the number of vents in the helmet, the greater the airflow around the head and the cooler it will feel, but the more the head is exposed and the less protection it will be. And along with the popularization of the helmet, the fixed ventilation holes are arranged on the helmet, so that the audiences of the helmet are fixed, and the individualized air volume adjusting requirement of a wearer cannot be met.

Disclosure of Invention

The invention aims to provide a top ventilation method for a helmet, which aims to solve the problem that the fixed ventilation holes arranged on the helmet cannot adjust the air quantity.

In order to achieve the purpose, the invention adopts the following technical scheme:

a top ventilation method for a helmet,

the method comprises the steps that a top ventilation switch is arranged at the top of a helmet body to control ventilation of the helmet body, when the top ventilation switch is closed, a second ventilation hole formed in the top of the helmet body is in a ventilation state, ambient wind can enter the helmet body from the second ventilation hole, and then the ambient wind returns to the atmospheric environment through a first ventilation hole formed in the rear of the helmet body and a third ventilation hole formed in the top ventilation switch in sequence; when the top ventilation switch is opened, the second ventilation hole is in a closed state, environmental wind enters a gap between the top ventilation switch and the helmet body from two sides of the top ventilation switch and is discharged from the third ventilation hole, negative pressure is formed in an area between the top ventilation switch and the helmet body, corresponding to the first ventilation hole, and heat inside the helmet body is sequentially discharged through the first ventilation hole and the third ventilation hole under the action of the negative pressure.

Optionally, the top ventilation switch is arranged above the first ventilation hole and the second ventilation hole, and is fixedly connected with the helmet body, and the first ventilation hole is communicated with the third ventilation hole.

Optionally, the top vent switch comprises:

the top ventilation body is connected to the helmet body, a long slotted hole is formed in the top ventilation body, and a baffle is arranged on one side, facing the helmet body, of the top ventilation body;

the pusher is arranged on one side of the top ventilation body;

the sliding sheet is arranged on the other side of the top ventilation body, the sliding sheet and the pusher are connected through the long slotted hole, the pusher can drive the sliding sheet to slide along the long slotted hole relative to the top ventilation body, when the sliding sheet is abutted to the baffle, the top ventilation switch is in a closed state, and when the sliding sheet is separated from the baffle, the top ventilation switch is in an open state.

Optionally, the baffle is equipped with two, two the baffle is located respectively the both sides of gleitbretter just form the throat along the air inlet direction.

Optionally, the second vent hole is arranged in front of the throat, when the sliding piece slides forwards to a proper position, the sliding piece is separated from the baffle, the top vent switch is in an open state, the second vent hole is closed, when the sliding piece slides backwards to a proper position, the sliding piece abuts against the baffle at the throat, and the top vent switch is in a closed state, and the second vent hole is open.

Optionally, one of the pusher and the sliding piece is provided with a clamping protrusion, the other is provided with a clamping groove, and the clamping protrusion can penetrate through the slotted hole and is clamped in the clamping groove.

Optionally, a guide hole is formed in the top ventilation body, the long axis direction of the guide hole is parallel to the long axis direction of the slotted hole, one of the pusher and the sliding piece is provided with a pin, and the other is provided with a pin hole, and the pin can penetrate through the guide hole and is in pin connection with the pin hole.

Optionally, the tail end of the slide plate in the air inlet direction is provided with a positioning long hole, and the positioning long hole is connected with a positioning pin arranged on the top ventilation body in a matched mode.

Optionally, the length of the positioning long hole, the length of the long slot hole and the length of the guide hole are equal.

Optionally, first ventilation hole is equipped with a plurality ofly along the direction of ventilating, third ventilation hole is followed the direction of ventilating is equipped with a plurality ofly, and is a plurality of first ventilation hole and a plurality of third ventilation hole is at the perpendicular to helmet body surface direction staggered distribution.

The invention has the beneficial effects that:

according to the top ventilation method for the helmet, the top ventilation switch is arranged at the top of the helmet body of the helmet, the closing and opening states of the second ventilation hole in the helmet body are switched by controlling the closing and opening states of the top ventilation switch, different ventilation functions are achieved, and the flow and the speed of airflow in the helmet can be adjusted manually according to different environments, so that the balance between the temperature in the helmet and the temperature of people is achieved, the problem that the helmet with fixed ventilation holes cannot adjust the air volume is solved, the individual requirements of different audiences are met, and the wearing comfort of the helmet is guaranteed.

Drawings

FIG. 1 is a schematic diagram of a top ventilation method for a helmet according to the present invention, in which a top ventilation switch is disposed on a helmet body;

FIG. 2 is a schematic view of a top vent switch in a closed state in the top vent method for a helmet according to the present invention;

fig. 3 is a schematic view of a ventilation method on a helmet body when a top ventilation switch is turned off in the top ventilation method for a helmet according to the present invention;

fig. 4 is a schematic view showing an open state of a top ventilation switch in the top ventilation method for a helmet according to the present invention;

fig. 5 is a schematic view of a ventilation method on a helmet body when a top ventilation switch is turned on in the top ventilation method for a helmet according to the present invention;

FIG. 6 is a schematic structural view of a top vent switch provided in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a clipper provided in the embodiment of the present invention;

fig. 8 is a schematic view of the location of a first vent and a second vent on a helmet body in an embodiment of the present invention.

In the figure:

1. a helmet body; 11. a first vent hole; 12. a second vent hole; 2. a top ventilation switch; 21. a top vent body; 211. a long slot hole; 212. a baffle plate; 213. a third vent hole; 214. a guide hole; 215. positioning pins; 216. a limiting baffle plate; 22. a clipper; 221. clamping convex; 222. a pin; 23. sliding blades; 231. a card slot; 232. a pin hole; 233. the long hole is positioned.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The invention provides a top ventilation method for a helmet, as shown in fig. 1-8, a top ventilation switch 2 is arranged at the top of a helmet body 1 to control ventilation of the helmet body 1, when the top ventilation switch 2 is closed, a second ventilation hole 12 arranged at the top of the helmet body 1 is in a ventilation state, ambient wind can enter the helmet body 1 from the second ventilation hole 12, and then returns to the atmospheric environment through a first ventilation hole 11 arranged at the rear of the helmet body 1 and a third ventilation hole 213 arranged on the top ventilation switch 2 in sequence; when the top ventilation switch 2 is opened, the second ventilation hole 12 is in a closed state, ambient wind enters from two sides of the top ventilation switch 2 and is discharged from the third ventilation hole 213, negative pressure is formed between the top ventilation switch 2 and the helmet body 1 in an area corresponding to the first ventilation hole 11, and heat inside the helmet body 1 is discharged through the first ventilation hole 11 and the third ventilation hole 33 in sequence under the action of the negative pressure.

In the helmet body 1 in the prior art, exchange ventilation between the head and the external environment is realized by arranging a plurality of fixed first ventilation holes 11 and second ventilation holes 12 on the helmet body 1, so that ventilation performance is ensured, and the helmet body is not adjustable. According to the ventilation method for the helmet, as shown in fig. 1, the top ventilation switch 2 is arranged on the outer surface of the helmet body 1, so that the air volume of the first ventilation hole 11 and the second ventilation hole 12 in the helmet body 1 can be adjusted to meet the air volume requirements of different wearers. As shown in fig. 2, the top ventilation switch 2 is in a closed state, at the moment, the second ventilation hole 12 in the helmet body 1 is in an open state as shown in fig. 3, at the moment, the ambient air can enter the helmet body 1 from the second ventilation hole 12, then is discharged from the first ventilation hole 11 arranged at the rear of the helmet body 1, and then is discharged through the third ventilation hole 213 in the top ventilation switch 2 in sequence, so that an ambient air circulation is realized, and in the process, the ambient air enters the helmet body 1 due to the impact extrusion effect of the air flow, so that the air volume and the air speed are large, and a good ventilation and heat dissipation effect can be achieved. When the top ventilation switch 2 is opened, as shown in fig. 4, ambient wind can enter from two sides of the front end of the top ventilation switch 2 and is discharged from the third vent hole 213 at the tail end, as shown in fig. 5, at this time, the second vent hole 12 on the helmet body 1 is in a closed state, so that negative pressure is formed between the top ventilation switch 2 and the helmet body 1, under the action of the negative pressure, head heat is discharged from the first vent hole 11, and is discharged from the third vent hole 213 at the tail end of the top ventilation switch 2 along with the ambient wind, and returns to the environment, so as to realize one-time ambient wind circulation, in the process, because the ambient wind enters from two sides of the top ventilation switch 2 and is discharged from the tail end, the ambient wind does not enter the helmet body 1, the head heat is discharged only under the action of the negative pressure to achieve the effects of temperature reduction and ventilation, so that a wearer feels very small wind speed, and still has a very good heat, the front second vent hole 12 is closed, so that the wind resistance at the front end of the helmet body 1 is reduced, and the rapid advance of a wearer is facilitated.

The helmet with the ventilation adjusting function has the advantages that the top ventilation switch 2 capable of being closed and opened is arranged, so that different ventilation adjusting functions are achieved, the flow and the speed of airflow in the helmet body 1 can be adjusted manually according to different environments, the balance between the temperature in the helmet body 1 and the temperature of the head of a wearer is achieved, the limitation problem of fixing ventilation holes is solved, the personalized requirements of different audiences are met, and the comfort level of the helmet is guaranteed. When a wearer rides, the helmet body 1 has internal and external circulation ventilation, the air circulation of the head and the internal contact part of the helmet body 1 is effectively improved, and the contact surface of the head is dry and comfortable even if the wearer wears the helmet for a long time. When the speed of riding is very fast, the environment wind gets into that helmet body 1 is inside can form very big windage, just at this time need open a ventilation switch 2 for inside environment wind does not directly get into helmet body 1, reduces the windage, carries and ventilates the head heat according to the negative pressure principle, realizes the regulation to the amount of wind and wind speed.

Optionally, the top ventilation switch 2 is disposed above the first ventilation hole 11 and the second ventilation hole 12, and is fixedly connected to the helmet body 1, and the first ventilation hole 11 is communicated with the third ventilation hole 213.

As shown in fig. 3 and 5, when the top vent switch 2 is in the open and closed states, the first vent hole 11 and the third vent hole 213 are both in the connected state, so that heat discharged from the first vent hole 11 can be discharged in time. The top ventilation switch 2 is arranged above the first ventilation hole 11 and the second ventilation hole 12, so that the ventilation state of the second ventilation hole 12 can be controlled simultaneously when the top ventilation switch 2 is in the opening and closing states. The mode of setting up top ventilation switch 2 can adjust between the amount of wind and the wind speed of difference, satisfies different wearers to the individualized demand of amount of wind and wind speed, expands the application group of helmet for more people all can wear the helmet comfortably.

As shown in fig. 6, the top ventilation switch 2 includes a top ventilation body 21, a pusher 22 and a sliding piece 23, the top ventilation body 21 is connected to the helmet body 1, the top ventilation body 21 is provided with a long slot hole 211, and a baffle 212 is arranged on one side of the top ventilation body 21 facing the helmet body 1; the pusher 22 is arranged on one side of the top ventilation body 21; the gleitbretter 23 is located the opposite side of top ventilation body 21, and the gleitbretter 23 is worn to establish slotted hole 211 with the clipper 22 and is connected, and the clipper 22 can drive the gleitbretter 23 and slide along slotted hole 211 for top ventilation body 21, and when gleitbretter 23 and baffle 212 looks butt, top ventilation switch 2 is in the closed condition, and when gleitbretter 23 and baffle 212 phase separation, top ventilation switch 2 is in the open mode.

As can be seen from fig. 3 and 5, when the top ventilation switch 2 is turned off, the second ventilation hole 12 of the helmet body 1 is in a ventilation state, and ambient wind can enter the interior of the helmet body 1 through the second ventilation hole 12. When the top ventilation switch 2 is opened, the second ventilation hole 12 is closed, and ambient wind can only enter a gap part between the top ventilation switch 2 and the helmet body 1 from two sides of the front end of the top ventilation switch 2 as shown in fig. 4. As shown in fig. 2, in the present embodiment, the top ventilation body 21 is connected to the outer side surface of the helmet body 1 by a screw, and a gap is formed between the top ventilation body and the outer side surface by setting the height of the screw hole, the width of the slide sheet 23 varies along the direction perpendicular to the air intake direction, when the slide sheet 23 slides backward (back direction), the wider front end portion contacts with the baffle 212, the top ventilation switch 2 is closed, and the second ventilation hole 12 ventilates; after the slide sheet 23 slides forward, the slide sheet 23 is separated from the baffle 212, and the top vent switch 2 is opened while the second vent hole 12 is closed.

As shown in fig. 2 and 4, two baffles 212 are provided, and the two baffles 212 are respectively provided at two sides of the sliding vane 23 and form a necking along the air intake direction.

By forming the two baffles 212 as a throat, when the top vent 2 is in the open state, the ambient wind can enter the top vent 2 from the two side edges along the baffles 212, and can finally be discharged from the third vent hole 213 at the end of the top vent body 21 along the sliding piece 23. The width of the slip sheet 23 and the top ventilation body 21 gradually narrows from the windward side to the leeward side, and the necking shape is favorable for forming a larger airflow inlet, and meanwhile, the airflow is rectified at the baffle 212, so that the inlet airflow passes through the upper part of the first ventilation hole 11 on the helmet body 1, and negative pressure is formed above the first ventilation hole 11, and the effects of heat dissipation and ventilation on the head are achieved.

Optionally, the second vent hole 12 is arranged in front relative to the throat, when the sliding piece 23 slides forward to the right, the sliding piece 23 is separated from the baffle 212, the top vent switch 2 is in an open state and the second vent hole 12 is closed, when the sliding piece 23 slides backward to the right, the sliding piece 23 abuts against the baffle 212 at the throat, the top vent switch 2 is in a closed state and the second vent hole 12 is open.

It can be understood that the top ventilation switch 2 is provided with a baffle 212 with a necking, the necking is opened and closed by abutting or separating the baffle 212 at the necking in the front-back sliding process of the sliding sheet 23, and then the opening and closing states of the top ventilation switch 2 are realized, wherein the arrangement of the sliding sheet 23 is required to meet the requirement that the top ventilation switch 2 is opened and closed, and meanwhile, the effect of closing and opening the second ventilation hole 12 on the helmet body 1 is achieved, so that the helmet body 1 can obtain two different heat exchange ventilation methods under two states of the top ventilation switch 2.

Optionally, one of the pusher 22 and the sliding piece 23 is provided with a locking protrusion 221, and the other is provided with a locking groove 231, and the locking protrusion 221 can penetrate through the slot hole 211 and can be locked in the locking groove 231.

Of course, the pusher 22 and the sliding piece 23 may be connected by other methods such as bolting, and the locking protrusion 221 and the locking groove 231 are connected in a matching manner, and are easy to detach. Mainly realizes the positioning of the pusher 22 and the sliding sheet 23 in the moving direction, so that the pusher 22 can drive the sliding sheet 23 to slide. The clamping protrusion 221 is of a structure with an elastic piece on the side, when the clamping protrusion 221 is inserted into the clamping groove 231, the elastic piece can be expanded in the clamping groove 231 to play a fastening role, and the elastic piece structure is convenient to detach.

Optionally, the top vent body 21 is provided with a guide hole 214, a long axis direction of the guide hole 214 is parallel to a long axis direction of the slotted hole 211, one of the pusher 22 and the sliding piece 23 is provided with a pin 222, and the other is provided with a pin hole 232, and the pin 222 can penetrate through the guide hole 214 and is pinned in the pin hole 232.

Referring to fig. 6 and 7, two guide holes 214 are preferably provided, and are respectively located on both sides of the slot hole 211 and aligned with the long axis direction of the slot hole 211, so as to provide a guide function for the movement of the slide 23. The length of the guiding hole 214 is not less than the length of the slot hole 211, so as to avoid affecting the sliding distance of the sliding plate 23.

Optionally, the slide 23 is provided with a long positioning hole 233 at the end along the air inlet direction, and the long positioning hole 233 is connected to the positioning pin 215 provided on the top ventilation body 21 in a matching manner.

As shown in fig. 6, the slide sheet 23 has a long positioning hole 233 at the end along the air inlet direction, the long positioning hole 233 is parallel to the long axis of the long slot hole 211, as shown in fig. 2 and 4, the top ventilation body 21 has a positioning pin 215, and after the slide sheet 23 and the pusher 22 are installed in place, the positioning pin 215 is inserted into the long positioning hole 233 and can slide along the long positioning hole 233 in the sliding process of the slide sheet 23. Further, as shown in fig. 2 and 4, the top ventilation body 21 is provided with a limiting blocking piece 216 at two side edges relative to the sliding piece 23, and the limiting blocking piece 216 can be pressed on the edge of the sliding piece 23 to further limit the sliding piece 23. During installation, the sliding piece 23 is firstly inserted into the limiting blocking piece 216, the positioning pin 215 is inserted into the positioning long hole 233 through elastic deformation of the sliding piece 23, and finally the pusher 22 and the sliding piece 23 are installed.

Alternatively, the lengths of the positioning long hole 233, the long groove hole 211, and the guide hole 214 are equal.

It can be understood that, during the sliding of the sliding piece 23, the positioning pin 215 slides in the long positioning hole 233, the locking protrusion 221 and the locking groove 231 slide in the long slot hole 211, and the pin 222 slides in the guiding hole 214, and the sliding of the three are consistent, so as to ensure the stable movement of the sliding piece 23.

Optionally, the first ventilation holes 11 are provided in plural along the ventilation direction, the third ventilation holes 213 are provided in plural along the ventilation direction, and the plural first ventilation holes 11 and the plural third ventilation holes 213 are distributed in a staggered manner in a direction perpendicular to the surface of the helmet body 1. In this embodiment, the size of the third ventilation hole 213 is larger than that of the first ventilation hole 11. As shown in fig. 1 and 8, the first ventilation hole 11 is a row of round holes arranged at intervals, the third ventilation hole 213 is a row of long holes arranged at intervals, the first ventilation hole 11 and the third ventilation hole 213 are both located on one side of the helmet body 1 facing away from the wind, the air outlet direction is inclined downward, when ambient wind enters from the windward side, the smaller first ventilation hole 11 and the larger third ventilation hole 213 form larger negative pressure more easily, the heat discharged from the first ventilation hole 11 is discharged through the third ventilation hole 213 and the gap outlet between the top ventilation body 21 and the helmet body 1 along the air discharge direction, and the better air permeability effect is provided inside the helmet body 1.

Advantageously, as shown in fig. 6, three third ventilation holes 213 are formed in the top ventilation body 21 on the leeward side along the ventilation direction, the three third ventilation holes 213 are arranged at intervals, a guide plate is arranged in the air outlet direction of each third ventilation hole 213, two ends of the guide plate are connected to the top ventilation body 21, the guide plate is arranged in an inclined manner along the thickness direction of the top ventilation body 3, the inclined direction is that an inclined air exhaust duct is formed in an inclined manner upwards from the windward side toward the leeward side, so that the ambient air in the third ventilation holes 213 is discharged in an inclined manner upwards without affecting the downwind direction of the wind in the adjacent third ventilation holes 213.

Supplementary note, when the top ventilation body 21 is installed, a gap is formed between the top ventilation body 21 and the helmet body 1, namely, the two baffles are not in contact with each other outside the processing connection position, the two baffles 212 are contracted from two sides of the top ventilation body 1 to the center in the gap to form a throat, when the sliding sheet 23 slides backwards, the sliding sheet 23 can be stopped at the throat to seal the gap inlet, when the sliding sheet 23 slides forwards, the sliding sheet 23 is separated from the throat, ambient wind can enter the gap between the top ventilation body 21 and the helmet body 1 from the gap and the throat and is exhausted from the third vent hole 213, meanwhile, negative pressure is formed above the first vent hole 11, and heat inside the helmet body 1 penetrates through the first vent hole 11 and is exhausted along with the ambient wind, so that the heat exchange and ventilation effects are realized.

In summary, the top ventilation switch 2 is arranged, two air inlet channels are respectively formed on the inner side and the outer side of the helmet body 1 of the helmet through the adjustment of the top ventilation switch 2, and the air inlet volume and the air speed are different, so that the wearing requirements of different users can be met, and the limitation problem that the existing helmet only has fixed ventilation holes is solved. By applying the method provided by the invention, the top ventilation switch with the adjusting function can be designed to adjust the air quantity and the air speed, so that the air permeability and the safety of the helmet meet the requirements, and the wearing comfort of the helmet is improved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A top ventilation method for a helmet,

the method comprises the steps that a top ventilation switch (2) is arranged at the top of a helmet body (1) to control ventilation of the helmet body (1), when the top ventilation switch (2) is closed, a second ventilation hole (12) formed in the top of the helmet body (1) is in a ventilation state, ambient air can enter the helmet body (1) from the second ventilation hole (12), and then returns to the atmosphere environment through a first ventilation hole (11) formed in the rear of the helmet body (1) and a third ventilation hole (213) formed in the top ventilation switch (2) in sequence; when top ventilation switch (2) are opened, second ventilation hole (12) are in the encapsulated situation, the environment wind is followed the both sides of top ventilation switch (2) get into top ventilation switch (2) with clearance between the helmet body of helmet (1) and follow third ventilation hole (213) are discharged top ventilation switch (2) with correspond between the helmet body of helmet (1) the region of first ventilation hole (11) forms the negative pressure, the inside heat of helmet body of helmet (1) passes through in order under the negative pressure the effect first ventilation hole (11) with third ventilation hole (213) are discharged.

2. The top ventilation method for helmets according to claim 1, wherein the top ventilation switch (2) is disposed above the first ventilation hole (11) and the second ventilation hole (12) and is fixedly connected to the helmet body (1), and the first ventilation hole (11) communicates with the third ventilation hole (213).

3. The top-ventilation method for helmets according to claim 2, wherein the top-ventilation switch (2) comprises:

the helmet body (1) is connected with the top ventilation body (21), the top ventilation body (21) is provided with a long slotted hole (211), and one side of the top ventilation body (21) facing the helmet body (1) is provided with a baffle (212);

the clipper (22), the said clipper (22) locates one side of the said top ventilation body (21);

slip sheet (23), slip sheet (23) are located the opposite side of top ventilation body (21), slip sheet (23) with clipper (22) are worn to establish slotted hole (211) are connected, clipper (22) can drive slip sheet (23) for top ventilation body (21) are followed slotted hole (211) slide, work as slip sheet (23) with when baffle (212) looks butt, top ventilation switch (2) are in the closed condition, work as slip sheet (23) with when baffle (212) phase separation, top ventilation switch (2) are in the open mode.

4. The top ventilation method for helmets according to claim 3, wherein the number of the baffle plates (212) is two, and the two baffle plates (212) are respectively provided on both sides of the sliding piece (23) and form a throat in the air intake direction.

5. The top ventilation method for helmets according to claim 4, wherein the second vent hole (12) is placed in front with respect to the throat, when the slide (23) slides forward in position, the slide (23) is separated from the shutter (212), the top ventilation switch (2) is in open condition and the second vent hole (12) is closed, when the slide (23) slides backward in position, the slide (23) abuts the shutter (212) at the throat, the top ventilation switch (2) is in closed condition and the second vent hole (12) is open.

6. The top ventilation method for helmets according to claim 3, wherein one of the pusher (22) and the slide (23) is provided with a locking protrusion (221), and the other is provided with a locking groove (231), and the locking protrusion (221) can penetrate through the slot hole (211) and be locked in the locking groove (231).

7. The top-ventilation method for helmets according to claim 3, wherein the top-ventilation body (21) is provided with a guide hole (214), the long axis direction of the guide hole (214) is parallel to the long axis direction of the slotted hole (211), one of the pusher (22) and the slide (23) is provided with a pin (222), and the other is provided with a pin hole (232), and the pin (222) can pass through the guide hole (214) and is pinned in the pin hole (232).

8. The top ventilation method for the helmet as claimed in claim 7, wherein the slide plate (23) is provided with a long positioning hole (233) at the end along the air intake direction, and the long positioning hole (233) is connected with a positioning pin (215) provided on the top ventilation body (21) in a matching manner.

9. The top ventilation method for a helmet as claimed in claim 8, wherein the length of the positioning long hole (233), the long slot hole (211) and the guide hole (214) is equal.

10. The top ventilation method for helmets according to claim 8, wherein the first ventilation hole (11) is provided in plurality along a ventilation direction, the third ventilation hole (213) is provided in plurality along the ventilation direction, and the plurality of first ventilation holes (11) and the plurality of third ventilation holes (213) are staggered in a direction perpendicular to the surface of the helmet body (1).