CN116832356A - Positive pressure power air supply protection device with composite noise reduction function - Google Patents

Abstract

The invention discloses a positive pressure power air supply protection device for composite noise reduction, which comprises a helmet shell, a helmet air duct shell and an elastic buffer assembly, wherein the helmet air duct shell stretches into a mounting cavity of the helmet shell and is arranged at intervals with the cavity wall surface of the mounting cavity, a noise reduction material is arranged in the helmet air duct shell and is used for limiting a helmet air duct, or the helmet air duct shell is of a double-layer wall structure, a noise reduction material layer is filled between the outer wall and the inner wall, and/or the inner wall surface of the inner wall is of a concave-convex structure and is used for limiting the helmet air duct, an air outlet of the helmet air duct is positioned above and/or beside the face of a wearer, and the helmet air duct shell is connected with the helmet shell through the elastic buffer assembly so as to reduce noise generated by collision of the helmet air duct shell and the helmet shell, and effectively solve the problems of noise on human health and influence on work.

Description

Positive pressure power air supply protection device with composite noise reduction function

Technical Field

The invention relates to the technical field of respiratory protection, in particular to a positive pressure power air supply protection device with composite noise reduction.

Background

Compared with the traditional protective device (such as a mask), the positive pressure power air supply protective device can provide higher-level respiratory protection, can effectively isolate dust, viruses and the like from entering a respiratory system, and can not feel dyspnea. However, the noise generated by the mechanical noise of the fan, the vibration noise of the air channel caused by the impact of the air flow on the air channel and the impact of the air channel on the helmet structure in the positive pressure power air supply protective device is large, the noise can influence the hearing and health of a wearer, and the long-term exposure to the noise level of high decibels can cause the problems of hearing loss, tinnitus, dizziness, inattention and the like. In addition, the noise in the air channel of the positive pressure air supply protective device can influence the communication and safety of a wearer, and the high-level noise can interfere the voice communication between the wearer and other people, so that the definition and quality of the communication are reduced.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a positive pressure power air supply protection device with composite noise reduction.

The positive pressure power air supply protection device for composite noise reduction in the embodiment of the invention comprises: the helmet comprises a helmet shell, a shell cover and a shell cover, wherein the helmet shell is used for protecting the head of a wearer, and a mounting cavity is arranged in the shell wall of the helmet shell; the helmet air duct shell extends into the mounting cavity of the helmet shell and is arranged at intervals with the cavity wall surface of the mounting cavity; the helmet air duct shell is connected with the helmet shell through the elastic buffer component;

the helmet air duct shell is internally provided with a silencing material and limits a helmet air duct, or is of a double-layer wall structure and comprises an outer wall and an inner wall positioned on the inner side of the outer wall;

when the helmet air duct shell is of a double-layer wall structure, a silencing material layer is filled between the outer wall and the inner wall, a helmet air duct is defined in the inner wall, and/or the inner wall surface of the inner wall is of a concave-convex structure and defines the helmet air duct, so that the cross section shape of the helmet air duct is changed along the airflow direction;

the air outlet of the helmet air duct is positioned above and/or beside the face of the wearer and is used for supplying air to the face of the wearer.

The embodiment of the invention provides a composite noise-reducing positive pressure power air supply protection device, which aims to reduce noise generated by an air duct of a positive pressure power air supply helmet. Set up the amortization material in helmet wind channel shell, perhaps through double-walled design, perhaps through designing the internal face of double-walled as concave-convex structure again, can reduce the noise that the air current bumped the wall face in helmet wind channel and produce to set up elastic buffer assembly between helmet shell and helmet wind channel shell, with the noise that reduces helmet wind channel shell and helmet shell striking and produce, effectively solve the problem that the noise was healthy to the human body and was influenced the work.

In some embodiments, a layer of sound attenuating material is affixed to an inner wall surface of the helmet tunnel housing to define the helmet tunnel; or the helmet air duct shell is filled with a porous silencing material, and the pore channels in the porous silencing material are communicated to form the helmet air duct.

In some embodiments, a sound-deadening material layer is attached to an inner wall surface of the helmet air duct shell, and an inner wall surface of the sound-deadening material layer, which is far away from the helmet air duct shell, is of a concave-convex structure, so that a cross-sectional shape of the helmet air duct changes along an airflow direction.

In some embodiments, the helmet wind channel shell is a double-wall structure, the inner wall surface of the helmet wind channel shell is a concave-convex structure, and a sound attenuation material layer is filled between the double-wall of the helmet wind channel shell.

In some embodiments, the elastic buffer assembly comprises a plurality of elastic blocks, wherein the elastic blocks are arranged between the helmet air duct shell and the helmet shell at intervals; alternatively, the elastic buffer assembly comprises an elastic material layer filled in a gap between the helmet wind tunnel shell and the helmet shell.

In some embodiments, the helmet shell includes a transparent visor that faces the wearer's face, and the air outlet of the helmet tunnel is directed to blow between the visor and the wearer's face.

In some embodiments, the positive pressure powered air supply protection device further comprises an active noise reduction system located on an inner wall surface of the helmet shell near the wearer's ear, the active noise reduction system comprising a microphone for collecting an ambient noise signal, a speaker for generating an inverse noise signal opposite to the ambient noise from the ambient noise signal, and a controller for emitting the inverse noise signal to cancel the noise.

In some embodiments, the positive pressure power air supply protection device further comprises an air supply channel shell, wherein the air supply channel shell is positioned on the outer side of the helmet shell, the inlet end of the air supply channel shell is communicated with the outlet of the fan, and the outlet end of the air supply channel shell is communicated with the inlet end of the helmet air duct shell and used for supplying air into the helmet air duct.

In some embodiments, a silencing material layer is attached to an inner wall surface of the air supply channel shell to define an air supply channel, and an inner wall surface of the silencing material layer, which is far away from the air supply channel shell, is of a concave-convex structure, so that a cross-sectional shape of the air supply channel changes along an airflow direction. Or the air supply channel shell is filled with a porous silencing material, and the pore channels in the porous silencing material are communicated to form an air supply channel.

In some embodiments, the air supply channel shell is of a double-wall structure, a silencing material layer is filled between the double walls of the air supply channel shell, and an air supply channel is defined by the inner wall of the air supply channel shell;

and/or the air supply channel shell is of a double-layer wall structure, the inner wall surface of the inner wall of the air supply channel shell is of a concave-convex structure and defines an air supply channel, so that the cross section shape of the air supply channel is changed along the airflow direction.

Drawings

Fig. 1 is a structural view of a composite noise reduction positive pressure power air supply protection device according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a composite noise reduction positive pressure power air supply protection device according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a positive pressure powered air supply protection device with composite noise reduction according to another embodiment of the present invention.

Fig. 4 is a schematic diagram of an active noise reduction system according to an embodiment of the present invention.

Reference numerals:

helmet shell 100, mounting cavity 110, visor 120,

Helmet air duct case 200, first inner wall 201, first outer wall 202, first layer of sound attenuating material 210, helmet air duct 220, air outlet 221,

Elastic buffer assembly 300, elastic block 310,

Active noise reduction system 400, microphone 410, speaker 420, controller 430,

Air supply channel housing 500, second inner wall 501, second outer wall 502, second layer of sound attenuating material 510, air supply channel 520, fan 600,

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The following describes a positive pressure power air supply protection device with composite noise reduction according to an embodiment of the present invention according to fig. 1 to 4. The positive pressure powered air supply protection device includes a helmet shell 100, a helmet tunnel shell 200, and a resilient cushioning assembly 300.

When the helmet shell 100 is worn on the head of a wearer by using the positive pressure power air supply protection device, the helmet shell 100 is used for protecting the head of the wearer from external impact. A mounting cavity 110 is provided in the shell wall of the helmet shell 100. The helmet wind tunnel case 200 extends into the installation cavity 110 of the helmet case 100 and is spaced apart from the cavity wall surface of the installation cavity 110. The helmet wind tunnel housing 200 is connected with the helmet housing 100 through an elastic buffer assembly 300. That is, the elastic buffer assembly 300 is disposed in a gap between the helmet wind tunnel housing 200 and the helmet housing 100 for coupling the two.

Therein, in some embodiments, a sound dampening material is disposed within the helmet airway shell 200 and defines the helmet airway 220. The silencing material has the sound absorption function and can reduce noise generated by the impact of air flow on the air duct wall. For example, as shown in fig. 2, a first sound deadening material layer 210 is attached to an inner wall surface of a helmet tunnel case 200, and defines a helmet tunnel 220. That is, the helmet wind tunnel 220 is defined by the first sound damping material layer 210 located inside the helmet wind tunnel case 200, and the shape of the helmet wind tunnel 220 is related to the structure of the inner wall surface of the first sound damping material layer 210. The fresh air flow mainly circulates in the helmet air duct 220, and the first silencing material layer 210 has a sound absorption effect, so that noise generated by the impact of the air flow on the air duct wall can be reduced. It should be noted that, when the sound-deadening material of the first sound-deadening material layer 210 is made of a porous material, a part of the airflow may also circulate through the pores in the first sound-deadening material layer 210. For another example, the helmet wind tunnel housing 200 is filled with a porous sound deadening material, and the channels in the porous sound deadening material are communicated to form a helmet wind tunnel. The porous silencing material is characterized in that the inside of the silencing material is provided with a porous structure, and the pores can be communicated with each other to form an air channel for ventilation.

In some alternative embodiments, as shown in fig. 3, the helmet wind tunnel housing 200 is a double-wall structure, and the helmet wind tunnel housing 200 includes a first outer wall 202 and a first inner wall 201, where the first inner wall 201 is located in the first outer wall 202 and is spaced apart from the first outer wall 202, and a helmet wind tunnel 220 is defined in the first inner wall 201. In the embodiment of the helmet wind tunnel shell 200 with a double-wall structure, the double-wall of the helmet wind tunnel shell 200 is filled with the first silencing material layer 210, that is, the first silencing material layer 210 is filled in the interval between the first outer wall 202 and the first inner wall 201, the fresh air flow flows through the helmet wind tunnel 220, and the first silencing material layer 210 plays a role of absorbing sound, so that noise generated when the air flow hits the wind tunnel wall is reduced. And/or, the inner wall surface of the first inner wall 201 has a concave-convex structure, and defines the helmet air duct 220, so that the cross-sectional shape of the helmet air duct 220 changes along the airflow direction. The air flow circulates in the helmet air duct 220, and noise sound waves generated in the air flow circulation process are reflected when touching the concave-convex structure on the inner wall surface of the first inner wall 201 and reflected back to the sound source direction, so that the noise reduction effect is achieved. When the first sound-deadening material layer 210 filled in the space between the first outer wall 202 and the first inner wall 201 is made of a porous material, a part of the air flow circulates through the pores in the first sound-deadening material layer 210. That is, the wind entering the helmet wind tunnel housing 200 by the blower is divided into two parts, one part entering the helmet wind tunnel 220 defined in the first inner wall 201 and the other part entering the space between the first outer wall 202 and the first inner wall 201 and circulating in the pores of the first sound damping material layer 210.

The air outlet 221 of the helmet stack 220 is positioned above and/or to the side of the wearer's face for supplying air to the wearer's face to provide fresh air to the wearer's mouth and nose.

The embodiment of the invention provides a composite noise-reducing positive pressure power air supply protection device, which aims to reduce noise generated by an air duct of a positive pressure power air supply helmet. Set up the amortization material in helmet wind channel shell, perhaps through double-walled design, perhaps through designing the internal face of double-walled as concave-convex structure again, can reduce the noise that the air current bumped the wall face in helmet wind channel and produce to set up elastic buffer assembly between helmet shell and helmet wind channel shell, with the noise that reduces helmet wind channel shell and helmet shell striking and produce, effectively solve the problem that the noise was healthy to the human body and was influenced the work.

In the embodiment where the first silencing material layer 210 is attached to the inner wall surface of the helmet wind tunnel housing 200, optionally, the first silencing material layer 210 is integrally attached to the inner wall surface of the helmet wind tunnel housing 200, and the helmet wind tunnel 220 is defined by the first silencing material layer 210. In other alternative embodiments, a first layer of sound attenuating material 210 is attached to a portion of the inner wall surface of the helmet tunnel enclosure 200, and the helmet tunnel 220 is defined by the helmet tunnel enclosure 200 and the first layer of sound attenuating material 210 together.

The first silencing material layer 210 is preferably integrally attached to the inner wall surface of the helmet air duct housing 200, so as to make the silencing effect better.

In the embodiment where the first silencing material layer 210 is attached to the inner wall surface of the helmet wind tunnel housing 200, optionally, as shown in fig. 2, the inner wall surface of the first silencing material layer 210 away from the helmet wind tunnel housing 200 has a concave-convex structure, so that the cross-sectional shape of the helmet wind tunnel 220 is changed along the airflow direction. The concave-convex structure of the inner wall surface of the first sound-deadening material layer 210 means that the inner wall surface of the first sound-deadening material layer 210 is not a plane or a flat arc surface. For example, as shown in fig. 2, a plurality of protrusions are formed on the inner wall surface of the first silencing material layer 210 attached to the inner wall surface of the helmet wind tunnel case 200 at intervals, so that the inner wall surface of the first silencing material layer 210 has a rugged structure, and further the cross-sectional shape of the helmet wind tunnel 220 at each position is different. The air flow circulates in the helmet air duct 220, and noise sound waves generated in the air flow circulation process are reflected when touching the concave-convex structure on the first silencing material layer 210 and reflected back to the sound source direction, so that the noise reduction effect is further improved.

Optionally, the first silencing material layer 210 is a porous material such as a fiberglass layer, a mild steel wire mesh layer, or a felt layer, and because the first silencing material layer 210 is a porous material, and the air flowing in the helmet air duct 220 can contact with the first silencing material layer 210, the first silencing material layer 210 also plays a role in filtering the air to a certain extent.

In embodiments where the helmet tunnel housing 200 is filled with a porous sound attenuating material. Optionally, the porous silencing material is porous material such as a glass fiber layer, a low-carbon steel wire mesh layer or a felt layer, and the air flow can circulate in pores inside the porous silencing material, and meanwhile, the porous silencing material also plays a role in filtering air to a certain extent.

In embodiments where the helmet wind tunnel housing 200 is a double wall structure. Preferably, as shown in fig. 3, the inner wall surface of the helmet wind tunnel case 200 has a concave-convex structure so that the cross-sectional shape of the helmet wind tunnel 200 is changed along the flow direction of the air stream, that is, the inner wall surface of the first inner wall 201 of the helmet wind tunnel case 200 has a concave-convex structure. And, a first silencing material layer 210 is filled between the first inner wall 201 and the first outer wall 202.

As an example, as shown in fig. 3, the first inner wall 201 has an irregular wave shape, and the size of the interval between the first inner wall 201 and the first outer wall 202 is different, thereby making the thickness of the first sound damping material layer 210 filled in the interval different. The air flow circulates in the helmet air duct 220, and noise sound waves generated in the air flow circulation process are reflected when touching the concave-convex structure on the inner wall surface of the first inner wall 201 and reflected back to the sound source direction, so that the noise reduction effect is further improved.

Optionally, the first sound dampening material layer 210 is a fiberglass layer, a low carbon steel wire mesh layer, or a felt layer. It should be noted that, in the embodiment where the helmet wind tunnel housing 200 has a double-wall structure, a portion of the airflow flowing in the helmet wind tunnel housing 200 may enter the double-wall structure to directly contact with the first silencing material layer 210.

In some alternative embodiments, as shown in fig. 2, the elastic buffer assembly 300 includes a plurality of elastic blocks 310, and the elastic blocks 310 are spaced between the helmet wind tunnel housing 200 and the helmet housing 100. One end of the elastic block 310 is connected to the cavity wall surface of the installation cavity 110 of the helmet shell 100, and the other end of the elastic block 310 is connected to the outer wall surface of the helmet wind tunnel shell 200. As an example, as shown in fig. 2 and 3, some of the number of elastic blocks 310 are located in the gap above the helmet tunnel shell 200 and another part is located in the gap below the helmet tunnel shell 200.

During the air supply, the air flow hits the helmet air duct housing 200, which causes the helmet air duct housing 200 to vibrate, and the impact with the helmet housing 100 generates noise. Providing the spring cushioning assembly 300 between the helmet wind tunnel housing 200 and the helmet housing 100 can reduce or avoid the impact between the helmet wind tunnel housing 200 and the helmet housing 100 by using elasticity, thereby reducing noise generated by the impact between the helmet wind tunnel housing 200 and the helmet housing 100.

Alternatively, the elastic block 310 is a rubber block, a sponge block, or other block-shaped structure made of elastic material.

In some alternative embodiments, the elastic buffer assembly 300 includes a layer of elastic material that fills in the gap between the helmet tunnel outer shell 200 and the helmet outer shell 100. That is, the elastic buffer assembly 300 may be disposed in the gap between the helmet wind tunnel housing 200 and the helmet housing 100 as in the embodiment shown in fig. 2, or may be coated on the outside of the helmet wind tunnel housing 200, forming a structure filled in the gap between the helmet wind tunnel housing 200 and the helmet housing 100, i.e., the elastic material layer may fill the gap. The provision of the elastic material layer may provide a cushioning effect to prevent noise from being generated by the impact between the helmet wind tunnel case 200 and the helmet case 100 due to vibration.

Alternatively, the elastic material layer is a rubber layer, a sponge layer or other layered material made of elastic material.

In some embodiments, as shown in fig. 1, the helmet shell 100 includes a transparent face shield 120, the face shield 120 being opposite the wearer's face, while protecting the wearer's face from the wearer's working view. The air outlet of the helmet air duct 220 is directed toward the face mask 120 and the face of the wearer, but the air outlet of the helmet air duct 220 is not directed toward the face of the wearer, but is directed toward the space between the face mask 120 and the face of the wearer, so as to improve the comfort of the wearer in breathing, and simultaneously, the wall air flow is directed toward the face mask 120 to generate noise.

To further enhance the noise reduction and attenuation, as shown in fig. 4, in some embodiments, the positive pressure power supply air protection device further includes an active noise reduction system 400, where the active noise reduction system 400 is located on the inner wall of the helmet shell 100 near the ear of the wearer, and the active noise reduction system 400 includes a microphone 410, a speaker 420, and a controller 430, where the microphone 410 is used to collect an ambient noise signal, the controller 430 is used to generate a reverse noise signal opposite to the ambient noise according to the ambient noise signal, and the speaker 420 is used to send the reverse noise signal to cancel the noise. The active noise reduction system 400 can further enhance the noise reduction and silencing effect, and avoid the influence of noise on the wearer.

In some embodiments, as shown in fig. 3, the positive pressure power air-supply protection device further includes an air-supply channel housing 500, the air-supply channel housing 500 being located outside the helmet shell 100, an inlet end of the air-supply channel housing 500 being in communication with an outlet of the blower 600, an outlet end of the air-supply channel housing 500 being in communication with an inlet end of the helmet wind tunnel housing 200 for supplying air into the helmet wind tunnel 220.

Preferably, a filtering device is provided between the outlet of the blower 600 and the inlet end of the supply air duct housing 500. The power device on the blower 600 sends the filtered air into the air supply channel 520, and then into the helmet air duct 220, and the air flowing out of the helmet air duct 220 is inhaled by the human body.

Further, noise is generated in order to prevent the air flow from striking the supply air duct housing 500. In some embodiments, a second layer of sound attenuating material 510 is attached to an inner wall surface of the air supply channel housing 500 to define an air supply channel 520. That is, the air flow path 520 is defined by the second noise damping material layer 510 located in the air flow path housing 500, and the shape of the air flow path 520 is related to the structure of the inner wall surface of the second noise damping material layer 510. The second silencing material layer 510 has a sound absorption effect, and can reduce noise generated when the airflow hits the air duct wall.

In order to further improve the noise reduction effect, optionally, an inner wall surface of the second noise reduction material layer 510, which is far away from the air supply channel housing 500, has a concave-convex structure, so that the cross-sectional shape of the air supply channel 520 changes along the airflow direction. The concave-convex structure of the inner wall surface of the second sound-deadening material layer 510 means that the inner wall surface of the second sound-deadening material layer 510 is not a plane or a flat arc surface. For example, a plurality of protrusions are formed on the inner wall surface of the second sound deadening material layer 510 at intervals, so that the cross-sectional shape of the air supply passage 520 is different at each position. Noise sound waves generated by the airflow in the circulation process are reflected when touching the concave-convex structure on the second silencing material layer 510, and are reflected back towards the sound source direction, so that the noise reduction effect is further improved.

In some alternative embodiments, the blower channel housing 500 is filled with a porous sound attenuating material, and the channels in the porous sound attenuating material are in communication to form the blower channel 520, through which the air flows. And the porous silencing material plays a role in sound absorption.

In other alternative embodiments, as shown in fig. 3, the air supply channel housing 500 has a double-wall structure, and the air supply channel housing 500 includes a second inner wall 501 and a second outer wall 502, where the second inner wall 501 is located in the second outer wall 502 and is spaced apart from the second inner wall 502. The double wall of the supply air duct housing 500 is filled with the second sound deadening material layer 510, that is, the second sound deadening material layer 510 is filled in the space between the second inner wall 501 and the second outer wall 502. The air supply duct housing 500 defines an air supply duct 520 therein. Specifically, the air supply duct 520 is defined by the inner wall surface of the second inner wall 501. And/or, the inner wall surface of the second inner wall 501 has a concave-convex structure and defines the air supply channel 520, so that the cross-sectional shape of the air supply channel 520 changes along the airflow direction.

In order to further improve the noise reduction effect, it is preferable that the double wall of the air supply duct housing 500 is filled with the second noise reduction material layer 510 and the inner wall surface of the second inner wall 501 of the air supply duct housing 500 has a concave-convex structure. As an example, as shown in fig. 3, the second inner wall 501 has an irregular wave shape, and the size of the space between the second inner wall 501 and the second outer wall 502 is different, thereby making the thickness of the second sound deadening material layer 510 filled in the space different. Noise sound waves generated by the airflow in the circulation process are reflected when touching the concave-convex structure on the inner wall surface of the second inner wall 501 and reflected back towards the sound source direction, so that the noise reduction effect is further improved.

Optionally, the second sound dampening material layer 510 is a fiberglass layer, a low carbon steel wire mesh layer, or a felt layer.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. The utility model provides a positive pressure power air supply protector that makes an uproar falls in complex which characterized in that includes:

the helmet comprises a helmet shell, a shell cover and a shell cover, wherein the helmet shell is used for protecting the head of a wearer, and a mounting cavity is arranged in the shell wall of the helmet shell;

the helmet air duct shell extends into the mounting cavity of the helmet shell and is arranged at intervals with the cavity wall surface of the mounting cavity;

the helmet air duct shell is connected with the helmet shell through the elastic buffer component;

the helmet air duct shell is internally provided with a silencing material and limits a helmet air duct, or is of a double-layer wall structure and comprises an outer wall and an inner wall positioned on the inner side of the outer wall;

when the helmet air duct shell is of a double-layer wall structure, a silencing material layer is filled between the outer wall and the inner wall, a helmet air duct is defined in the inner wall, and/or the inner wall surface of the inner wall is of a concave-convex structure and defines the helmet air duct, so that the cross section shape of the helmet air duct is changed along the airflow direction;

the air outlet of the helmet air duct is positioned above and/or beside the face of the wearer and is used for supplying air to the face of the wearer.

2. The composite noise reduction positive pressure power air supply protection device according to claim 1, wherein a sound attenuation material layer is attached to an inner wall surface of the helmet air duct shell so as to define the helmet air duct;

or the helmet air duct shell is filled with a porous silencing material, and the pore channels in the porous silencing material are communicated to form the helmet air duct.

3. The positive pressure power air supply protection device for composite noise reduction according to claim 2, wherein a silencing material layer is attached to the inner wall surface of the helmet air duct shell, and the inner wall surface of the silencing material layer, which is far away from the helmet air duct shell, is of a concave-convex structure, so that the cross-sectional shape of the helmet air duct is changed along the airflow direction.

4. The composite noise reduction positive pressure power air supply protection device according to claim 1, wherein the helmet air duct shell is of a double-layer wall structure, the inner wall surface of the helmet air duct shell is of a concave-convex structure, and a silencing material layer is filled between the outer wall and the inner wall of the helmet air duct shell.

5. The composite noise reduction positive pressure power air supply protection device according to claim 1, wherein the elastic buffer assembly comprises a plurality of elastic blocks, and the elastic blocks are arranged between the helmet air duct shell and the helmet shell at intervals;

alternatively, the elastic buffer assembly comprises an elastic material layer filled in a gap between the helmet wind tunnel shell and the helmet shell.

6. The composite noise reduction positive pressure powered air supply protection device of claim 1, wherein the helmet shell comprises a transparent mask, the mask is opposite to the face of the wearer, and the air outlet of the helmet air duct is directed to supply air between the mask and the face of the wearer.

7. The composite noise reduction positive pressure power supply protection device of claim 1, further comprising an active noise reduction system located on an inner wall surface of the helmet shell near the wearer's ear, the active noise reduction system comprising a microphone for collecting an ambient noise signal, a speaker for generating a reverse noise signal opposite to the ambient noise based on the ambient noise signal, and a controller for emitting the reverse noise signal to cancel noise.

8. The composite noise reduction positive pressure powered air supply protection device of any one of claims 1-7, further comprising an air supply channel enclosure located outside of the helmet enclosure, an inlet end of the air supply channel enclosure in communication with a blower outlet, an outlet end of the air supply channel enclosure in communication with an inlet end of the helmet air duct enclosure for supplying air into the helmet air duct.

9. The composite noise reduction positive pressure power air supply protection device according to claim 8, wherein a silencing material layer is attached to an inner wall surface of the air supply channel shell so as to define an air supply channel, and an inner wall surface of the silencing material layer, which is far away from the air supply channel shell, is of a concave-convex structure so that the cross-sectional shape of the air supply channel changes along the airflow direction;

or the air supply channel shell is filled with a porous silencing material, and the pore channels in the porous silencing material are communicated to form an air supply channel.

10. The composite noise reduction positive pressure power air supply protection device according to claim 8, wherein the air supply channel shell is of a double-wall structure, a silencing material layer is filled between the double walls of the air supply channel shell, and an air supply channel is defined by the inner wall of the air supply channel shell;

and/or the air supply channel shell is of a double-layer wall structure, the inner wall surface of the inner wall of the air supply channel shell is of a concave-convex structure and defines an air supply channel, so that the cross section shape of the air supply channel is changed along the airflow direction.