Face shield

Abstract

To reduce a flow rate loss when external air enters a face shield.SOLUTION: A face shield 1 capable of covering a mouth part and a nose part of a user includes: a shield member 3; an internal housing 4; an external cover 5; a wearing member 6; a suction assembly 7; a filter medium; and a power supply 9. Between the external cover 5 and the internal housing 4, a temporary storage channel is formed, and a fan is rotated to generate a suction air flow; between a suction opening of the temporary storage channel and a first opening, a temporary storage channel for changing a distance between the user's nose part and the suction opening is formed. When the user generates high pressure exhaust, a part of the gas of the high pressure exhaust first enters the temporary storage channel, continues to be sucked from the suction air flow, passes a second opening, contacts the filter medium, and cannot flow out of the suction opening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a face shield that can cover a user's mouth and nose, and more particularly to a face shield that increases the channel distance between an intake opening and a collection space via a temporary storage channel. [Background technology]

[0002] The mask is designed to shield the wearer's mouth and nose, and can filter out most airborne particles and harmful substances such as dust, and can also prevent airborne viruses and bacteria from entering the wearer's mouth and nose.

[0003] Among these, filtering respirators are a type of mask. Filtering respirators have a filter cartridge or filter that filters the air inhaled by the wearer, further reducing harmful substances in the air that directly flows into the wearer's mouth and nose. However, the gas exhaled by the wearer contains viruses or bacteria, and these viruses or bacteria are directly emitted into the air without being filtered, polluting the air and causing the air inhaled by the wearer to have a high content of viruses or bacteria.

[0004] Furthermore, when a wearer inhales air while wearing a mask, the air around the mask enters the wearer's mouth and nose directly through the mask body, and bacteria or viruses exhaled by the wearer are mixed with the outside air, so that many of the bacteria or viruses exhaled by the wearer are carried into the mask and enter the wearer's mouth and nose, causing the wearer to inhale a high proportion of bacteria or viruses. Summary of the Invention

[0005] The main purpose of the present invention is to provide a face shield with a temporary storage channel, which extends the channel distance between the intake opening and the collection space, and some of the high-pressure exhaust gas generated by the user first enters the temporary storage channel and then continues to be sucked into the intake airflow and return to the collection space, so that all of the high-pressure exhaust gas passes through the second opening and comes into contact with the filter material, and cannot flow out of the intake opening.

[0006] A secondary object of the present invention is to reduce flow loss when external air enters the face shield by having the first opening cross section of the first opening and the temporary storage channel cross section of the temporary storage channel have the same cross section area, so that external air can continuously flow from the temporary storage channel to enter the first opening, and further, the external air does not change the channel it flows through due to the difference in cross section area between the temporary storage channel cross section and the first opening cross section.

[0007] Yet another object of the present invention is that the outer cover can be selectively replaced, and a user can assemble different types of outer covers to the inner housing according to different situations, thereby changing the channel distance formed between the intake opening and the collection space.

[0008] To achieve the above object, the face shield of the present invention can cover the mouth and nose of a user and includes a shielding member, an inner housing, an outer cover, a wearing member, a suction assembly, a filter material, and a power supply. The shielding member has a contact portion that fits the contours of the user's face and a covering portion that extends forward from the contact portion, whereby a collection space is formed inside the covering portion and an attachment opening is provided in the covering portion. The inner housing is connected to the attachment opening and is configured with a first opening located above the nose and a second opening located below the nose, for communicating with the collection space, respectively, and a male connector portion is configured on the outside of the inner housing.

[0009] In a first preferred embodiment, the outer cover has a guide portion that shields the first opening and a female connection portion that is detachably connected to the male connection portion, the guide portion contacts outer surfaces of the inner housing and the shielding member to form a temporary storage channel between the outer cover and the inner housing, one end of the temporary storage channel is in communication with the collection space via the first opening, and the other end of the temporary storage channel is in communication with an intake opening.The wearing member can be connected to the face shield so that the face shield can be positioned on the head of the user.

[0010] The guide section includes a first extension section, a direction change section, and a second extension section, the direction change section being disposed between the first extension section and the second extension section, and the external air passes through the direction change section to change its direction in the guide section and enter the first opening. The external air enters the first opening from the intake opening along a temporary storage route, and different sides of the temporary storage route are connected to the intake opening contour of the intake opening and the first opening contour of the first opening, respectively. The external air can enter any position on the intake opening contour along the temporary storage route to any position on the first opening contour, and all the temporary storage routes have the same route length in the temporary storage channel.

[0011] Furthermore, the first opening has a first opening contour, and the first opening contour of the first opening and the temporary storage channel contour of the temporary storage channel are consistent, so that the first opening cross-section of the first opening and the temporary storage channel cross-section of the temporary storage channel have the same cross-sectional area.

[0012] In particular, by extending the first extension section and bringing it close to the second opening, the cross section of the temporary storage channel has a shielded cross section that is shielded from the second opening and an exposed cross section that is not shielded from the second opening, and the exposed cross section and the first opening cross section have the same cross-sectional area.

[0013] However, the male connection portion of the inner housing has a guide rail and a coupling portion, and the female connection portion of the outer cover has an engaging abutment section, and when the outer cover is assembled to the outside of the inner housing along the vertical direction, the engaging abutment section is positioned between the guide rail and the coupling portion.

[0014] The suction assembly has an exhaust pipe assembled to the second opening and a fan assembled to the exhaust pipe, the filter material is attached to the suction assembly, and the power supply is electrically connected to the fan, which can be rotated to generate a suction airflow so that the air in the collection space can be discharged toward the second opening.

[0015] Furthermore, a temporary storage route is formed between the intake opening and the first opening to change the distance between the user's nose and the intake opening, and when the user generates high-pressure exhaust, some of the gas in the high-pressure exhaust first enters the temporary storage channel and then continues to be sucked from the intake airflow and returns to the collection space, so that all of the high-pressure exhaust passes through the second opening and comes into contact with the filter material, and cannot flow out of the intake opening.

[0016] Furthermore, since the second opening cross-section of the second opening is larger than the first opening cross-section, the collection space cross-section of the collection space gradually increases from the first opening toward the second opening, and by extending the time that the high-pressure exhaust remains in the collection space, the opportunity for the high-pressure exhaust to come into contact with the suction airflow increases.

[0017] In a second preferred embodiment, the external cover has at least one guide member for dividing the temporary storage channel into a plurality of guide channels, so that the external air can enter the first opening through the plurality of guide channels; in particular, the guide member may be a sponge provided inside the external cover, so that the external air can enter the first opening through the sponge.

[0018] The present invention is characterized as follows: The face shield has an outer cover selectively attached to and detached from an inner housing, and a temporary storage channel is formed between the inner housing and the outer cover. The shielding member has a contact portion that fits the contours of the user's face and a covering portion that extends forward from the contact portion, and a collection space is formed inside the covering portion. The inner housing is connected to the attachment opening of the covering portion and has a first opening located above the nose and a second opening located below the nose, each of which communicates with the collection space. A male connection portion is formed on the outside of the inner housing, and the first opening has a first opening contour. The first opening contour of the first opening and the temporary storage channel contour of the temporary storage channel are consistent, so that the first opening cross-section of the first opening and the temporary storage channel cross-section of the temporary storage channel have the same cross-sectional area, and the external cover has a guide portion that shields the first opening and a female connector that is detachably connected to the male connector, so that a temporary storage channel is formed between the external cover and the internal housing, one end of the temporary storage channel is connected to the collection space through the first opening, and an intake opening is formed at the other end of the temporary storage channel, so that the channel distance formed between the intake opening and the collection space is extended by the temporary storage channel. Note that the power supply is electrically connected to a fan that rotates to generate a suction airflow and can discharge air from the collection space toward the second opening, so that the channel distance formed between the intake opening and the collection space is extended by the temporary storage channel. Furthermore, when a user generates high-pressure exhaust, some of the gas in the high-pressure exhaust first enters the temporary storage channel and then continues to be sucked in from the suction airflow and returns to the collection space, so that all of the high-pressure exhaust passes through the second opening and comes into contact with the filter material, and cannot flow out of the intake opening. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a face shield according to a first preferred embodiment of the present invention. [Figure 2] FIG. 2 is a schematic view showing a face shield according to a first preferred embodiment of the present invention being worn by a user. [Figure 3]FIG. 3 is an exploded view of the face shield in the first preferred embodiment of the present invention. [Figure 4A] FIG. 4A is a schematic diagram of the shielding member and the inner housing in the first preferred embodiment. [Figure 4B] FIG. 4B is a schematic cross-sectional view showing the shielding member assembled to the inner housing in the first preferred embodiment. [Figure 5A-5B] 5A and 5B are schematic diagrams of the outer cover in the first preferred embodiment. [Figure 6A] FIG. 6A is a schematic cross-sectional view of the first opening in the first preferred embodiment. [Figure 6B] FIG. 6B is a schematic cross-sectional view of the temporary storage channel in the first preferred embodiment. [Figure 6C] FIG. 6C is a schematic cross-sectional view of the second opening in the first preferred embodiment. [Figure 7] FIG. 7 is a schematic diagram showing the operation of the face shield in the first preferred embodiment of the present invention to form a suction airflow. [Figure 8] FIG. 8 is a schematic partial enlarged view showing how the face shield in the first preferred embodiment of the present invention operates to form a suction airflow. [Figure 9] FIG. 9 is a schematic cross-sectional view of a face shield in the second preferred embodiment. [Figure 10] FIG. 10 is a schematic diagram of the airflow of the outside air passing through the guide channel in the second preferred embodiment. [Figure 11-12] 11 and 12 are schematic diagrams of the shielding member, inner housing, outer cover and wearing member in the third preferred embodiment. [Figure 13] FIG. 13 is a schematic diagram of the shielding member and the inner housing in the third preferred embodiment. [Figure 14] FIG. 14 is a schematic cross-sectional view showing the shielding member assembled to the inner housing in the third preferred embodiment. [Figure 15-16]15 and 16 are schematic diagrams of the outer cover in the third preferred embodiment. [Figure 17] FIG. 17 is a schematic cross-sectional view of the temporary storage channel in the third preferred embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to more clearly and specifically appreciate and understand the structure, use and features of the present invention, preferred embodiments will now be described in detail with reference to the accompanying drawings.

[0021] 1, 2, 3, and 7, a face shield 1 according to the present invention can be worn by a user 2 at a position on a facial contour 22 in front of a head 21, so that the face shield 1 can cover the mouth 23 and nose 24 of the user 2. Furthermore, high-pressure exhaust air F1 generated when the user 2 breathes or sneezes at the nose 24, and when the user 2 talks or coughs at the mouth 23 is sucked and collected by the face shield 1, filtered, and discharged as clean air, thereby preventing the transmission of droplet-borne diseases such as influenza, enterovirus, or COVID-19 to others.

[0022] 2, 3, 4A, 4B, and 7. In a first preferred embodiment, the face shield 1 is mainly composed of a shielding member 3, an inner housing 4, an outer cover 5, a wearing member 6, a suction assembly 7, a filter material 8, and a power supply 9. The shielding member 3 has a contact portion 31 that fits the facial contours 22 of the user 2 and a covering portion 32 that extends forward from the contact portion 31. A collection space 33 is formed inside the covering portion 32, and the covering portion 32 is provided with an attachment opening 34 and a plurality of holes 35 that are provided around the attachment opening 34. In particular, the constituent material of the shielding member 3 is not limited, and the shielding member 3 may be made of a skin-friendly material such as silica gel or latex.

[0023] 2, 4A, 4B, 6B, and 6C. In a first preferred embodiment, the inner housing 4 is connected to the mounting opening 34 and includes an inner housing body 41 and an exhaust pipe 42 extending to the inner housing body 41. The inner housing body 41 is configured with a first opening 43, a male connector 44, and a plurality of bumps 45. The first opening 43 is located above the nose 24. The male connector 44 is provided on the outer structure of the inner housing 4 and includes a guide rail 441 and a coupling portion 442. The guide rail 441 and the coupling portion 442 are provided on the outer surface of the inner housing body 41, and the plurality of bumps 45 are provided on the outer edge of the inner housing 4. In this preferred embodiment, the first opening 43 is located in front of the nose 24 of the user 2, and the opening direction of the first opening 43 toward the outer cover 5 forms a first opening contour 431. In this embodiment, the first opening contour 431 is arc-shaped, and the exhaust pipe 42 has a second opening 46 located below the nose 24. In this embodiment, the second opening 46 is close to the mouth 23 of the user 2, and the first opening 43 and the second opening 46 are connected to the collecting space 33, and the guide rail 441 and the connecting portion 442 are jointly disposed between the first opening 43 and the second opening 46. In this embodiment, the inner housing body 41 is configured with an outer wall 411 with an arc-shaped contour located between the first opening 43 and the second opening 46. In particular, the bumps 45 of the inner housing 4 penetrate and engage with the holes 35 of the shielding member 3, connecting the shielding member 3 to the outer periphery of the inner housing 4. When the inner housing 4 is fixed to the head 21 of the user 2, the shielding member 3 is pressed and adhered to the facial contour 22 of the user 2.

[0024] 3, 4A, 4B, 5A, 5B, 6A, and 6B. In a first preferred embodiment, the outer cover 5 includes a guide portion 51 having a first extension section 511, a direction-changing section 512, and a second extension section 513, and a female connection portion 52 extending from the guide portion 51. The direction-changing section 512 is disposed between the first extension section 511 and the second extension section 513, so that the guide portion 51 can cover the first opening 43. In this embodiment, the first extension section 511 includes an outer wall 514 having a polygonal outline, and the direction-changing section 512 includes an outer wall 515 having a polygonal outline. The female connection portion 52 is provided on the outer periphery of the outer cover 5 and has an engaging abutment section 53 connecting the first extension section 511 and the direction-changing section 512. In particular, the engaging abutment section 53 of the outer cover 5 can be moved close to the male connection portion 44 of the inner housing 4, and the engaging abutment section 53 can be assembled to the connecting portion 442 of the inner housing 4 along the guide rail 441, so that the outer cover 5 can be assembled to the outside of the inner housing 4 in the vertical direction, and the engaging abutment section 53 can be engaged and abutted to be positioned between the guide rail 441 and the connecting portion 442, and the guide portion 51 can contact the outer surfaces of the inner housing 4 and the shielding member 3, so that the second extension section 513 can stick to the outer wall of the inner housing 4 and the outer cover 5 can be tightly attached to the inner housing 4. Furthermore, a temporary storage channel 54 is formed between the outer cover 5 and the inner housing 4, one end of the temporary storage channel 54 is connected to the collection space 33 via the first opening 43, and an intake opening 55 is formed at the other end of the temporary storage channel 54, so that the face shield 1 is detachably connected to the male connector 44 via the female connector 52, and the outer cover 5 can be selectively attached to and detached from the outer periphery of the inner housing 4. Furthermore, the volume of the temporary storage channel 54 must exceed 200 cc.

[0025] 1, 2, 3, 4A, and 6C. In a first preferred embodiment, the wearing member 6 has a mating portion 61 and an elastic portion 62 connected to the mating portion 61. When the mating portion 61 is assembled into the groove 47 of the coupling portion 442, the wearing member 6 is connected to the male connecting portion 44 of the inner housing 4, and the two wearing members 6 are respectively provided on both sides of the outer cover 5. The elastic portions 62 are elastic strings that independently form surrounding spaces, so that the elastic strings can surround the ears 25 of the user 2, and the face shield 1 can be positioned on the head 21 of the user 2 by elastic action. However, the structure of the wearing member 6 is not limited, and the wearing member 6 may be a string made of a stretchable material that is directly tied to the male connecting portion 44 of the inner housing 4.

[0026] 1, 2, 3 and 7, in a first preferred embodiment, the suction assembly 7 includes an exhaust pipe 71 and a fan 72. The exhaust pipe 71 is assembled to the second opening 46 of the inner housing 4, and the fan 72 is assembled to an end of the exhaust pipe 71, and among other things, the exhaust pipe 71 has an inlet end 73 and an outlet end 74 on different sides thereof, respectively. The exhaust pipe 71 further includes a first adapter 75 constituting the inlet end 73, a second adapter 76 constituting the outlet end 74, and a mounting casing 77 between the first adapter 75 and the second adapter 76. The first adapter 75 is connected to a first pipe 751 connected to the second opening 46. The mounting casing 77 has a first pipe 751 and a diffuser 752 connected to the first pipe 751, and the first pipe 751 tapers from the second opening 46 toward the diffuser 752. The top and bottom of the mounting casing 77 are formed with a circular wall 771 and a square wall 772, respectively. The circular wall 771 is adjacent to the diffuser 752 of the first adapter 75 to form a first flow cross section, and the square wall 772 is adjacent to the second adapter 76 to form a second flow cross section, which is larger than the first flow cross section. The second adapter 76 has an adapter end 761 connected to the square wall 772 and an outlet end 74 connected to the fan 72. A tapered wall is formed between the adapter end 761 and the outlet end 74, so that the second flow cross section is larger than the outlet cross section of the second adapter 76. The filter material 8 is attached to the inside of the mounting casing 77 of the suction assembly 7 and is configured with many pleated surfaces to increase the contact area for filtering.

[0027] 2, 3, 7 and 8. In a first preferred embodiment, the power supply 9 is electrically connected to the fan 72 of the suction assembly 7 so that the fan 72 can continue to rotate and generate the suction airflow F2. The suction airflow F2 is generated in the collection space 33 inside the shielding member 3, and a pressure difference is created inside the inner housing 4 by the fan 72. As a result, the external air F3 first enters the interior of the outer cover 5 through the intake opening 55, and then passes through the first extension section 511 and the direction change section 512 of the outer cover 5 in order. When the external air F3 passes through the direction change section 512, the direction of movement of the guide part 51 is changed, and the external air F3 passes through the temporary storage channel 54 and enters the interior of the inner housing 4 through the first opening 43. Thus, the external air F3 can continuously enter the temporary storage channel 54 and be provided to the user 2 for use. Furthermore, the external air F3 can continuously enter the first opening 43. A temporary storage route 48 is formed between the intake opening 55 and the first opening 43 to change the distance between the nose 24 of the user 2 and the intake opening 55, and the time the external air F3 stays in the face shield 1 is increased. However, when the user 2 breathes, sneezes, speaks, or coughs, the high-pressure exhaust air F1 is generated, and some of the gas in the high-pressure exhaust air F1 first enters the temporary storage channel 54 and is subsequently sucked into the suction airflow F2 and returned to the collection space 33. As a result, all of the high-pressure exhaust air F1 and the air in the collection space 33 are collected by the inner housing 4 and discharged together with the external air F3 through the second opening 46 into the suction assembly 7, and finally discharged from the other side of the fan 72. In particular, the filter material 8 is distributed in the airflow channel generated by the suction airflow F2, so that the external air F3 and the high-pressure exhaust air F1 can both pass through the filter material 8 and filter out viruses in the exhaust air, and the high-pressure exhaust air F1 cannot flow out of the intake opening 55. Furthermore, the high-pressure exhaust F1 that passes through the filter material 8 and is transferred out of the face shield 1 is mixed again with the external air F3, and the mixed high-pressure exhaust F1 passes through the temporary storage channel 54 again and enters the first opening 43.

[0028] 6A, 6B, 6C, 7 and 8. In a first preferred embodiment, the first opening contour 431 of the first opening 43 and the temporary storage channel contour 56 of the temporary storage channel 54 are coincident, and the temporary storage channel contour 56 is disposed between the outer wall 411 of the inner housing body 41 and the outer wall 514 of the first extension section 511, and between the outer wall 411 of the inner housing body 41 and the outer wall 515 of the turning section 512, so that the first opening cross section 432 of the first opening 43 and the temporary storage channel cross section 57 of the temporary storage channel 54 have the same cross-sectional area. As a result, during the process of the external air F3 passing from the intake opening 55 along the temporary storage route 48 through the temporary storage channel 54 and entering the first opening 43, different sides of the temporary storage route 48 are respectively connected to the intake opening contour 551 of the intake opening 55 and the first opening contour 431 of the first opening 43, and the external air F3 can enter any position of the first opening contour 431 along the temporary storage route 48 from any position on the intake opening contour 551. Furthermore, since each temporary storage route 48 all has the same route length in the temporary storage channel 54, the external air F3 can move continuously, and the channel it moves through does not change due to a change in the cross-sectional area of ​​the temporary storage channel cross section 57 or the first opening cross section 432, thereby further reducing the flow loss of the external air F3. Although the form of the first extension section 511 of the outer cover 5 is not limited, the first extension section 511 can be extended toward the intake opening 55, so that the first extension section 511 is close to the second opening 46, and further the temporary storage channel cross section 57 of the temporary storage channel 54 has a shielded cross section that is shielded from the second opening 46 and an exposed cross section that is not shielded from the second opening 46. The exposed cross sections are provided on both the left and right sides of the second opening 46, and the exposed cross sections and the first opening cross section 432 have the same cross-sectional area.

[0029] Furthermore, since the second opening cross-section 461 of the second opening 46 is larger than the first opening cross-section 432 of the first opening 43, the collection space cross-section of the collection space 33 gradually increases from the first opening 43 toward the second opening 46, and further by extending the time that the high-pressure exhaust F1 remains in the collection space 33, the opportunity for the high-pressure exhaust F1 to come into contact with the suction airflow F2 increases.

[0030] 9 and 10 , the second preferred embodiment differs from the first preferred embodiment in the structural configuration of the outer cover 5. The structural configurations of the shielding member 3, the inner housing 4, the wearing member 6, the suction assembly 7, the filter medium 8, and the power supply 9 are the same as those of the first preferred embodiment, and therefore will not be described further. As shown in the drawings, the outer cover 5 of the second preferred embodiment has at least one more guide member 58 than the outer cover 5 of the first preferred embodiment. In this embodiment, the guide member 58 is formed by a plate disposed inside the outer cover 5 and parallel to the guide rail 441. The guide member 58 divides the temporary storage channel 54 into a plurality of guide channels 541, allowing the external air F3 to pass through the plurality of guide channels 541 and enter the first opening 43. The external air F3 enters the first opening 43 after being rectified or guided, and the external air F3 can continue to flow through the temporary storage channel 54. This allows the external air F3 to pass through the central region of the temporary storage channel 54, maintaining the same airflow intensity as in the outer regions provided on both sides of the central region. The structural form of the guide member 58 is not limited, and the guide member 58 may be a sponge provided inside the outer cover 5, and the external air F3 can pass through the sponge and enter the first opening 43.

[0031] Please refer to Figures 11, 12, 13, 14, 15, 16 and 17. The third preferred embodiment differs from the first preferred embodiment in the appearance of the inner housing 4 and the outer cover 5, and the appearance and structure of the wearable member 6. The structures of the inner housing 4 and the outer cover 5 are the same as those of the inner housing 4 and the outer cover 5 in the first preferred embodiment. The appearance and structure of the shielding member 3, the suction assembly 7, the filter medium 8 and the power supply 9 are all the same as those in the first preferred embodiment, so further description will be omitted. As shown in the figure, in the third preferred embodiment, the first opening contour 431 of the inner housing 4 is striped, and the inner housing body 41 of the inner housing 4 is configured with a flat outer wall 412 between the first opening 43 and the second opening 46, and the first extension section 511 of the outer cover 5 is configured with a horizontally contoured outer wall 516, and the turning section 512 is configured with a horizontally contoured outer wall 517, thereby achieving the temporary storage. A channel contour 56 is provided between the outer wall 412 of the inner housing body 41 and the outer wall 516 of the first extension section 511, and between the outer wall 412 of the inner housing body 41 and the outer wall 517 of the turning section 512, and further, the first opening contour 431 of the first opening 43 and the temporary storage channel contour 56 of the temporary storage channel 54 are consistent, and the first opening cross-section of the first opening 43 and the temporary storage channel cross-section 57 of the temporary storage channel 54 have the same cross-sectional area.

[0032] Continuing to refer to Figures 11, 12, 13, 14, 15, 16 and 17, in a third preferred embodiment, the wearing member 6 has a combination part 61 and an elastic part 62 assembled to the combination part 61. The combination part 61 has a hook block 63 and a plurality of holes 64. When the hook block 63 is engaged with the groove 47 of the connecting part 442, the combination part 61 is assembled to the connecting part 442, and the two combination parts 61 of the wearing member 6 are positioned on both the left and right sides of the outer cover 5, respectively. Note that different ends of the elastic part 62 are inserted into the plurality of holes 64, respectively, so that the elastic part 62 is connected to the combination part 61, and the wearing member 6 is further connected to the male connecting part 44 of the inner housing 4. [Explanation of symbols]

[0033] 1 face shield 2 users 21 Head 22 Facial Contour 23 Mouth 24 Nose 25 Ears 3 Shielding material 31 Contact part 32 Covering part 33 Collection Space 34 Mounting opening 35 holes 4 Inner housing 41 Inner housing body 411 Exterior wall 412 Exterior wall 42 Exhaust pipe 43 First Opening 431 First opening contour 432 1st opening cross section 44 male connector 441 Guide Rail 442 Joint 45 Bump 46 Second Opening 461 2nd opening cross section 47 Groove 48 Temporary storage route 5 Outer cover 51 Guide section 511 First Extension Section 512 Turning Section 513 Second Extension Section 514 Polygonal Contour 515 Exterior wall 516 Exterior Wall 517 Exterior wall 52 female connection 53 Engagement abutment section 54 Temporary storage channel 541 Guide Channel 55 Intake opening 551 Intake opening contour 56 Temporary storage channel contour 57 Temporary storage channel cross section 58 Guide member 6 Wearing parts 61 Combination section 62 Elastic part 63 Hook Block 64 holes 7 Suction Assembly 71 Exhaust pipe 72 fans 73 Inlet end 74 Outlet end 75 First Adapter 751 1st tube 752 Expander 76 Second Adapter 761 Adapter end 77 Mounting casing 771 Circular Wall 772 square wall 8 Filter material 9 Power Supply F1 high pressure exhaust F2 Suction airflow F3 External air

Claims

1. A face shield that can cover a user's mouth and nose, a shielding member having a contact portion adapted to fit the contours of the user's face and a covering portion extending forward from the contact portion, whereby a collection space is formed inside the covering portion and an attachment opening is provided in the covering portion; an inner housing having a first opening located above the nose portion and a second opening located below the nose portion, the first opening and the second opening being connected to the mounting opening and communicating with the collection space, and a male connector on the outside; an external cover having a guide portion that shields the first opening and a female connection portion that is detachably connected to the male connection portion, the guide portion contacting outer surfaces of the internal housing and the shielding member to form a temporary storage channel between the external cover and the internal housing described below, one end of the temporary storage channel communicating with the collection space via the first opening, and an intake opening formed at the other end of the temporary storage channel; a wearable member connected to the face shield so that the face shield can be positioned on the user's head; a suction assembly having an exhaust line assembled to the second opening and a fan assembled to the exhaust line; a filter medium attached to the suction assembly; a power supply electrically connected to the fan, the power supply being rotated to generate a suction airflow such that the air in the collection space can be exhausted toward the second opening; A face shield characterized in that a temporary storage route is formed between the intake opening and the first opening to change the distance between the user's nose and the intake opening, and when the user generates high-pressure exhaust, some of the gas in the high-pressure exhaust first enters the temporary storage channel and then is continuously sucked from the suction airflow and returned to the collection space, so that all of the high-pressure exhaust passes through the second opening and comes into contact with the filter material, and cannot flow out of the intake opening.

2. 2. The face shield of claim 1, wherein the first opening has a first opening contour, and the first opening contour of the first opening matches a temporary storage channel contour of the temporary storage channel, such that the first opening cross-section of the first opening has the same cross-sectional area as the temporary storage channel cross-section of the temporary storage channel.

3. 3. The face shield according to claim 2, wherein the guide portion has a first extension section, a direction change section, and a second extension section, the direction change section is provided between the first extension section and the second extension section, and external air can enter the first opening by passing through the direction change section and changing its movement direction in the guide portion.

4. 4. The face shield of claim 3, wherein the external air enters the first opening from the intake opening along the temporary storage route, and different sides of the temporary storage route are respectively connected to the intake opening contour of the intake opening and the first opening contour of the first opening, so that the external air can enter any position of the first opening contour along the temporary storage route from any position in the intake opening contour, and each of the temporary storage routes has the same route length in the temporary storage channel.

5. 4. The face shield of claim 3, wherein by extending the first extension section to be proximate to the second opening, a cross section of the temporary storage channel has a shielded cross section that is shielded from the second opening and an exposed cross section that is not shielded from the second opening, and the exposed cross section has the same cross-sectional area as the first opening cross section.

6. 2. The face shield of claim 1, wherein the male connection portion of the inner housing has a guide rail and a coupling portion, and the female connection portion of the outer cover has an engaging abutment section, and when the outer cover is assembled to the outside of the inner housing along a vertical direction, the engaging abutment section is positioned between the guide rail and the coupling portion.

7. 3. The face shield of claim 2, wherein the second opening cross-section of the second opening is larger than the first opening cross-section, so that the collection space cross-section of the collection space gradually increases from the first opening toward the second opening, thereby extending the time that the high-pressure exhaust gas remains in the collection space, thereby increasing the opportunity for the high-pressure exhaust gas to come into contact with the suction airflow.

8. 4. The face shield of claim 3, wherein the outer cover has at least one guide member for dividing the temporary storage channel into a plurality of guide channels, so that the outside air can enter the first opening through the plurality of guide channels.

9. 9. The face shield according to claim 8, wherein the guide member is a sponge provided inside the outer cover, so that the outside air can pass through the sponge and enter the first opening.

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