An air blowing mechanism

Abstract

This utility model belongs to the technical field of ventilated protective helmets or ventilated welding masks, and discloses an air supply mechanism, including a headband and an air duct. The air duct includes an outer connector, a fixed section, and a movable section connected in sequence. The air duct extends from the wearer's occipital region, around the wearer's top of the head, and toward the wearer's forehead. The headband has multiple mounting positions on the wearer's forehead. The movable section is detachably connected to one of the mounting positions. The air supply mechanism provided by this utility model features a fixed section of the air duct secured by a connecting strap, maintaining the stability of the air supply. The movable section is matched with multiple mounting positions, allowing for flexible adjustment of the air vent connection position and orientation. The air duct extends from the wearer's top of the head, avoiding interference between the air duct and other components.

Description

Technical Field

[0001] This utility model belongs to the technical field of ventilated protective helmets or ventilated welding masks, and particularly relates to an air supply mechanism. Background Technology

[0002] In many fields such as industrial production, construction, outdoor work, and the military, protective helmets and welding masks are essential equipment for ensuring the safety of personnel's heads. With the development of technology and the increasing demand for comfortable working environments, ventilated protective helmets have emerged, which allow air circulation through ventilation ducts to provide a comfortable head environment for the wearer.

[0003] An improperly designed ventilation duct layout can cause pressure and friction on other internal components of the helmet. For example, if the bends in the ventilation duct press directly against the cushioning pad, it can not only cause localized deformation of the pad, affecting its ability to cushion impacts and reducing the helmet's safety protection, but also potentially damage the pad due to prolonged friction, shortening its lifespan.

[0004] Secondly, an unreasonable ventilation duct layout can easily interfere with the wearer's eyes and other critical areas. For example, if the ventilation duct is located close to the eyes, exhaled moisture can easily condense near the eyes after flowing along the duct, obstructing vision and posing a significant threat to the safety of work and movement.

[0005] Furthermore, improper layout of the ventilation ducts and helmet securing devices can also affect each other. For example, the securing devices may obstruct the smooth flow of air within the ventilation ducts, resulting in poor ventilation. Conversely, a cluttered layout of the ventilation ducts may hinder the stability of the securing devices, reducing the overall stability of the helmet and even causing it to loosen or shift during certain activities, thus failing to adequately protect the wearer's safety and user experience. In addition, poorly positioned ventilation ducts can affect ventilation efficiency. For instance, if the ventilation duct openings are concentrated on one side of the helmet, it will not allow for all-around airflow, causing localized stuffiness on the wearer's head. This can significantly impact comfort during prolonged work and may even lead to heatstroke.

[0006] An improperly designed ventilation duct layout can interfere with the wearer's normal activities, pose safety hazards to workers, and impair their ability to observe and judge their surroundings. Furthermore, if the ventilation duct layout conflicts with the helmet's internal cushioning structure, it not only hinders smooth airflow but may also compress the cushioning layer, reducing the helmet's original protective performance and failing to effectively protect the head in the event of an accident. Therefore, a well-planned ventilation duct layout is crucial.

[0007] Furthermore, the thick and heavy material of the ventilation duct adds to the overall weight of the helmet. The complex structure of the ventilation duct also contributes to the weight, which is detrimental to the pursuit of lightweight and comfortable use. Improperly secured ventilation ducts can cause internal interference. For example, the fixing clips may compress and deform the ventilation duct, or the duct may wobble and rub against other components, reducing performance and comfort.

[0008] In view of this, it is necessary to further improve and optimize the air supply mechanism to meet the high performance requirements of ventilated protective helmets in different application scenarios. Utility Model Content

[0009] To address at least one or more of the technical problems mentioned above, this utility model provides an air delivery mechanism, comprising: a headband and an air duct, wherein the air duct includes an external connector, a fixed section, and a movable section connected in sequence; the air duct extends from the occipital region of the wearer, around the top of the wearer's head, toward the forehead region of the wearer; the headband is provided with multiple mounting positions in the forehead region of the wearer; and the movable section is detachably connected to one of the mounting positions.

[0010] According to one embodiment of the present invention, the headband includes a forehead portion surrounding the forehead region, a back occipital portion surrounding the occipital region, a top occipital portion surrounding the top occipital region, and a connecting band extending from the occipital region toward the top occipital region and connecting to the top occipital region; a duct extends from the back occipital portion toward the forehead portion along the extending direction of the connecting band; at least one of the external connector and the fixing tube portion is fixedly connected to the connecting band; and multiple mounting positions are provided on the forehead portion.

[0011] According to one embodiment of the present invention, the duct includes a fixed pipe section and two or more movable pipe sections, each movable pipe section being connected to the fixed pipe section; or, the duct includes multiple fixed pipe sections and multiple movable pipe sections that match each other, each movable pipe section being connected to a matching fixed pipe section; or, the duct includes multiple fixed pipe sections and multiple movable pipe sections, each movable pipe section being connected to one or more fixed pipe sections; or, the duct includes multiple fixed pipe sections and multiple movable pipe sections, with the multiple fixed pipe sections being fixedly connected to each other.

[0012] According to one embodiment of the present invention, the duct is a flexible duct, or at least the moving part of the duct is a flexible duct.

[0013] According to one embodiment of the present invention, the fixed tube and the movable tube are movably connected.

[0014] According to one embodiment of the present invention, the fixed tube and the movable tube are connected by any one of the following: pivot connection, hinge connection, bearing connection, rotary joint connection, and universal joint connection.

[0015] According to one embodiment of the present invention, the fixed tube and the movable tube are rotatably connected in the extending direction of the forehead.

[0016] According to one embodiment of the present invention, the air duct includes a hollowed-out frame and an outer skin, with the outer skin wrapping around the frame to form an air supply passage.

[0017] According to one embodiment of the present invention, the fixed frame of the fixed tube and the movable frame of the movable tube are movably connected.

[0018] According to one embodiment of the present invention, the fixed frame of the fixed tube and the movable frame of the movable tube are connected by any one of the following: pivot connection, hinge connection, bearing connection, rotary joint connection, and universal joint connection.

[0019] According to one embodiment of the present invention, the fixed frame of the fixed tube and the movable frame of the movable tube are rotatably connected in the extending direction of the forehead.

[0020] According to one embodiment of the present invention, the skeleton material is any one of plastic, metal, or carbon fiber.

[0021] According to one embodiment of the present invention, a first connector is provided on the fixed outer skin surface of the fixed tube portion, and the first connector is fixedly connected to the connecting belt; and / or, a second connector is provided on the movable outer skin of the movable tube portion, and the second connector is detachably connected to the forehead portion.

[0022] According to one embodiment of the present invention, the headband further includes a restraint strap that is connected to a connecting strap and an external connector at both ends; the restraint strap surrounds the starting end of the fixing tube and restrains the starting end of the fixing tube to the external connector.

[0023] According to one embodiment of the present invention, the occipital region is provided with a first end, a second end, and an adjustment part; the adjustment part selectively adjusts the length of the occipital region by adjusting the relative movement of the first end and the second end.

[0024] According to one embodiment of the present invention, the air supply mechanism further includes a support frame, which includes a support leg mounted on the adjustment part and a support arm that is substantially parallel to the axial direction of the outer connector; the connecting belt or the outer connector is provided with a support rail extending along the axial direction; the support arm and the support rail are slidably connected.

[0025] According to one embodiment of the present invention, a limiting member is provided at the end of the support arm, and the limiting member restricts the sliding displacement of the support arm on the support rail.

[0026] According to one embodiment of the present invention, the top of the head is provided with a third end and a fourth end; the third end is provided with a plurality of holes arranged along the length direction; the fourth end is provided with at least one pin arranged along the length direction; the length of the top of the head can be selectively adjusted by adjusting the relative movement of the third end and the fourth end through the cooperation of the pin and the holes.

[0027] According to one embodiment of the present invention, the connecting belt includes a fifth end at the top of the connector and a sixth end for connecting the external connector; the fifth end is provided with a sleeve hole parallel to the extension direction of the third end, and a positioning post is provided on the inner wall of the sleeve hole; the third end includes a protrusion with at least one positioning hole that matches the positioning post, which is provided between the hole and the collar and faces away from the fourth end; the third end passes through the sleeve hole so that the protrusion is located in the sleeve hole, and the positioning post is inserted into the positioning hole to adjust the position of the fifth end.

[0028] According to one embodiment of the present invention, the ventilation opening of the movable pipe is provided with a wind direction adjustment component; the wind direction adjustment component includes a support frame; a rotatable inner shell with an inlet and an outlet is provided inside the support frame, and there is at least one rotation angle such that the inlet of the inner shell is connected to the ventilation opening when the inner shell rotates, and the outlet partially overlaps with the ventilation opening.

[0029] According to one embodiment of the present invention, a rotatable paddle is provided inside the inner shell, and there is at least one rotation angle that changes the wind direction of the inner shell outlet when the paddle rotates; the inner shell is provided with multiple teeth, and the paddle is provided with claws that match the teeth. The claws are mounted on the teeth so that the paddle is limited by the cooperation of the claws and teeth when it rotates.

[0030] The air supply mechanism provided by this utility model features a fixed duct section secured by a connecting strap, ensuring stable airflow. The movable duct section has multiple mounting positions, allowing for flexible adjustment of the duct's ventilation opening orientation. The duct extends from the wearer's head area, preventing interference between the duct and other components. The flexible duct allows for adjustment of the external connector's ventilation opening position and orientation. A support frame enhances the stability of the external connector. The support arm of the support frame, in conjunction with a support rail, ensures the external connector maintains a certain range of motion even when supported, accommodating different wearers. The movable connection between the fixed frame of the fixed duct section and the movable frame of the movable duct section increases the duct's adjustment angle. An airflow direction adjustment component provides airflow direction adjustment. A limiting component prevents the external connector from detaching. A restraining strap prevents the external connector from separating from the fixed duct section. Attached Figure Description

[0031] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0032] Figure 1 A schematic diagram of the air supply mechanism is shown;

[0033] Figure 2 A schematic diagram of the headband is shown;

[0034] Figure 3 A schematic diagram showing another angle of the headband is shown;

[0035] Figure 4 A schematic diagram of the air duct is shown;

[0036] Figure 5 A schematic diagram of the support frame is shown;

[0037] Figure 6 A schematic diagram of the duct's framework is shown;

[0038] Figure 7 A schematic diagram of the outer skin of the air duct is shown;

[0039] Figure 8 A schematic diagram showing another angle of the duct's outer skin;

[0040] Figure 9 A schematic diagram of the wind direction adjustment component is shown;

[0041] Figure 10 A schematic diagram is shown showing the air supply mechanism connecting the air duct to the intermediate connection position. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0044] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0045] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] Figure 1 A schematic diagram of the air supply mechanism is shown.

[0047] Figure 2 A schematic diagram of the headband is shown.

[0048] Figure 3 A schematic diagram showing another angle of the headband is shown.

[0049] Figure 4 A schematic diagram of the air duct is shown.

[0050] like Figures 1 to 4 As shown, the air supply mechanism includes a headband 1 and an air duct 2. The air duct 2 includes an external connector 21, a fixed tube section 22, and a movable tube section 23 connected in sequence. The air duct 2 extends from the occipital region of the wearer, around the top of the wearer's head, toward the forehead region of the wearer. The headband 1 has multiple mounting positions in the forehead region of the wearer. The movable tube section 23 is detachably connected to one of the mounting positions.

[0051] The headband 1 is used to secure the wearer's head and to fix the air duct 2.

[0052] The external connector 21 of the duct 2 is used to connect to the air supply equipment. The gas delivered by the air supply equipment enters through the external connector 21, passes through the air supply channel formed by the fixed pipe section 22 and the movable pipe section 23, and is discharged from the vent of the movable pipe section 23 to supply the wearer's face mask or helmet. In this invention, the duct 2 can be a flexible pipe as a whole, or only the movable pipe section 23 can be a flexible pipe, so that the duct 2 can be bent to adjust its direction or the position of its vent.

[0053] The external connector 21 of the air duct 2 is located in the occipital region of the wearer, and the ventilation opening of the movable tube 23 is located in the forehead region of the wearer. The air duct 2 wraps around the top of the wearer's head, avoiding interference between the air duct 2 and other mechanisms connected to both sides of the headband 1. The headband 1 has multiple mounting positions in the forehead region of the wearer for selective connection of the movable tube 23, used to adjust the position of the ventilation opening of the movable tube 23. The position of the ventilation opening of the air duct 2 can be adjusted as needed to adapt to different ventilation requirements. The mounting position refers to the location for receiving the movable tube, which can be connected to the headband 1 or to the face mask housing. Preferably, the mounting position refers to the connection position on the headband 1.

[0054] like Figure 2 and Figure 3As shown, the headband 1 includes a forehead portion 11 surrounding the forehead region, a back occipital portion 12 surrounding the occipital region, a top occipital portion 13 surrounding the top occipital region, and a connecting band 14 extending from the occipital region toward the top occipital region and connecting to the top occipital portion 13; a duct 2 extends from the back occipital portion 12 toward the forehead portion 11 along the extending direction of the connecting band 14; at least one of the external connector 21 and the fixing tube portion 22 is fixedly connected to the connecting band 14; and multiple mounting positions are provided on the forehead portion 11.

[0055] In this invention, the forehead portion 11 and the back of the head portion 12 of the headband 1 form a basic annular circumference, laterally encircling the wearer's head. The top of the head 13 is connected at both ends to the basic annular circumference formed by the forehead portion 11 and the back of the head 12, fitting snugly against the top of the wearer's head, thus fixing the headband 1 as a whole to the wearer's head. Left and right connecting portions are respectively provided on the left and right sides of the headband 1 for connecting the outer shell of a protective helmet, welding mask, etc. The protective helmet, outer shell, and other equipment are detachably mounted on the left and right connecting portions via angle adjustment components. When the wearer wears the headband 1, the forehead portion 11 encircles and fits snugly against the wearer's forehead area, and the back of the head portion 12 encircles and fits snugly against the wearer's occipital bone area. The protective helmet, welding mask, and other equipment connected to the headband 1 are also fixed to the wearer's head.

[0056] The two ends of the top of the head 13 can be fixedly or detachably connected to the left connecting portion and the right connecting portion, respectively, and can also be connected to other positions on the circumference formed by the forehead 11 and the back of the head 12. Preferably, the forehead 11, the back of the head 12, and the top of the head 13 form the left connecting portion on the left side of the wearer and the right connecting portion on the right side of the wearer. More preferably, the forehead 11, the back of the head 12, and the top of the head 13 are integrally formed or at least one of them is separately arranged and assembled together.

[0057] like Figure 2 and Figure 3 As shown, the length of the occipital region 12 can be adjusted by the adjustment part 123, and the adjustment part 123 can always remain basically located in the center of the wearer's occipital region.

[0058] Specifically, the occipital portion 12 is provided with a first end 121, a second end 122 and an adjustment part 123; the adjustment part 123 selectively adjusts the length of the occipital portion 12 by adjusting the relative movement of the first end 121 and the second end 122.

[0059] Both the first end 121 and the second end 122 are movable ends of the occipital region 12. According to one embodiment of this invention, the first end 121 and the second end 122 are provided with matching elongated slots, the long sides of which are serrated. The adjusting part 123 engages with the serrated teeth of the elongated slots of the first end 121 and the second end 122 via gears, adjusting the relative movement of the first end 121 and the second end 122 along their length extension direction, thereby tightening or loosening the occipital region 12. The adjusting part 123 is always located in the middle position of the occipital region 12, corresponding to the wearer's occipital bone area. The structure of the adjusting part 123 is prior art and will not be described in detail in this invention.

[0060] like Figure 2 and Figure 3 As shown, the length of the top 13 can be adjusted through its own structure.

[0061] Specifically, the top of the head 13 is provided with a third end 131 and a fourth end 132; the third end 131 is provided with a plurality of holes arranged along the length direction; the fourth end 132 is provided with at least one pin arranged along the length direction; the length of the top of the head 13 is selectively adjusted by adjusting the relative movement of the third end 131 and the fourth end 132 through the cooperation of the pin and the holes.

[0062] The third end 131 and the fourth end 132 are the free ends of the top of the head 13, connected by a pin. The length of the top of the head 13 can be adjusted by inserting the pin into different holes to tighten or loosen the pin along its extension direction, thus adapting to the contours of different wearers' heads. Preferably, the third end 131 has a loop at its end; the fourth end 132 passes through the loop. The loop allows the third end 131 and the fourth end 132 to fit together.

[0063] In this invention, one function of the connecting strap 14 is to fix the outer connector 21 and / or the tube 22, and another function is to exert an upward pulling force on the outer connector 21, thereby fixing the distance between the outer connector 21 and the top of the wearer's head. The connecting strap 14 is made of a flexible material such as plastic, and can be attached to the back of the wearer's head and occipital region. As the curvature of the back of the head of different wearers changes, the orientation of the outer connector 21 is basically controlled.

[0064] The connection between the connecting strap 14 and the top of the head 13 is configured to be detachably connected, so that the connecting strap 14 can be adjusted along the top of the head 13 to keep the connecting strap 14 basically located on the center line of the wearer's head.

[0065] like Figure 2 and Figure 3 As shown, the connection position of the connecting strap 14 at the top of the head 13 can be adjusted so that the position of the connecting strap 14 is always basically located in the top area of ​​the wearer's head.

[0066] Specifically, the connecting band 14 includes a fifth end 141 connecting the top of the head 13 and a sixth end 142 connecting the outer connector 21; the fifth end 141 is provided with a sleeve hole parallel to the extension direction of the third end 131 of the head band, and a positioning post is provided on the inner wall of the sleeve hole; the third end 131 includes at least one positioning hole protrusion provided between the hole and the collar, facing away from the fourth end 132, and is provided with a positioning hole matching the positioning post. The third end 131 passes through the sleeve hole, so that the protrusion is located in the sleeve hole, and the positioning post is inserted into the positioning hole to adjust the position of the fifth end 141.

[0067] By cooperating with the positioning post and different positioning holes, the connection position of the fifth end 141 of the connecting band 14 can be finely adjusted, so that when adjusting the length of the top of the head 13, the connection position of the fifth end 141 is adjusted accordingly, so that the connection position of the fifth end 141 is kept basically in the center of the top band.

[0068] like Figure 4 As shown, the headband 1 also includes a restraint strap 15 with its two ends connected to the connecting strap 14 and the outer connector 21, respectively; the restraint strap 15 wraps around the starting end of the fixing tube 22, securing the starting end of the fixing tube 22 to the outer connector 21. By providing the restraint strap, the outer connector is prevented from detaching from the fixing tube.

[0069] Figure 5 A schematic diagram of the support frame is shown.

[0070] like Figures 1 to 5 As shown, the air supply mechanism also includes a support frame 3, which includes a support leg 31 mounted on the adjustment section 123 and a support arm 32 that is substantially parallel to the axial direction of the outer connector 21. The connecting belt 14 or the outer connector 21 is provided with a support rail 211 extending axially. The support arm 32 is slidably connected to the support rail 211. A limiting member 321 is provided at the end of the support arm, which restricts the sliding displacement of the support arm 32 on the support rail 211. By providing the limiting member, the outer connector can be prevented from falling off.

[0071] The support frame 3 is used to directly or indirectly support the outer connector 21 of the duct 2, that is, the support frame 3 directly supports the outer connector 21 or indirectly supports the outer connector 21 through the support connecting strap 14. The support legs 31 of the support frame 3 are mounted on the adjustment part 123, and the support arm 32 is formed above the support legs 31, extending forward and upward at an angle. The angle of inclination of the support arm 32 can be set according to the inclination direction of the outer connector 21. Preferably, the support arm 32 is configured as a column or plate. Correspondingly, a support rail 211 is provided at the bottom of the connecting strap 14 or the outer connector 21. The support rail 211 is configured with a cross-section that matches the support arm 32, such as a column or plate-shaped cylinder. According to another embodiment of the present invention, the shapes of the support arm 32 and the support rail 211 can be interchanged. For example, the support arm 32 is configured as a cylinder, and the support rail 211 is configured as a column or plate-shaped cylinder that matches the cylinder shape.

[0072] By matching the support arm 32 and the support rail 211, the support arm 32 and the support rail 211 can slide relative to each other along the axial direction of the outer connector 21. When the length of the back of the head 12 is adjusted due to the different head circumference of the wearer, the support frame 3 can move along the front and back direction with the adjustment part 123. The support arm 32 can still maintain its cooperation with the support rail 211, thereby stably supporting the outer connector 21.

[0073] The support leg 31 and support arm 32 bend backward to form a shock-absorbing bend, extending the length of the support arm 32. When the wearer's head circumference is small, the support frame 3 may move forward with the adjustment part 123, potentially exceeding the position of the outer connector 21. Due to the backward bending structure, the length of the support arm 32 is extended, allowing the support rail 211 to slide backward along the support arm 32 with a larger displacement, thereby avoiding interference from the displacement of the adjustment part 123 with the outer connector 21.

[0074] like Figure 1 and Figure 4 As shown, the duct 2 extends along the extension direction of the connecting strap 14, and the external connector 21 and / or the fixed pipe section 22 are fixed by the connecting strap 14, so that the duct 2 maintains a stable posture. Preferably, both the external connector 21 and the fixed pipe section 22 are fixed by the connecting strap 14, which can make the external connector 21 maintain a stable posture and the fixed pipe section 22 provide a stable gas passage.

[0075] The multiple mounting positions provided on the forehead 11 allow for selective connection of the movable tube 23 of the air duct 2, providing a structure for adjusting the orientation of the movable tube 23. Preferably, the mounting positions are distributed along the direction extending from the forehead 11, allowing the adjustment angle of the movable tube 23 to cover the wearer's forehead area.

[0076] The detachable connection between the mounting position and the movable tube 23 includes bonding, riveting, snap-fit ​​connection, or equivalent methods.

[0077] Figure 1 and Figure 4 The diagram shows a duct 2 comprising two pipes. It will be understood by those skilled in the art that the duct 2 of this invention may include one or more pipes.

[0078] According to one embodiment of the present invention, the air duct 2 includes a fixed pipe section 22 and two or more movable pipe sections 23, each movable pipe section 23 being connected to the fixed pipe section 22. That is, the gas delivered by the air supply equipment enters the fixed pipe section 22 through the external connector 21, is distributed from the fixed pipe section 22 to the two or more movable pipe sections 23, and is discharged from the vents of the two or more movable pipe sections 23.

[0079] According to another embodiment of the present invention, the duct 2 includes a plurality of fixed pipe sections 22 and a plurality of movable pipe sections 23 that match each other, and each movable pipe section 23 is connected to a matching fixed pipe section 22. That is, one fixed pipe section 22 matches one movable pipe section 23 to form an independent gas passage, each fixed pipe section 22 is fixed by a connecting strap 14, and the connection position of each movable pipe section 23 can be adjusted at the forehead 11 of the headband 1.

[0080] According to another embodiment of the present invention, the air duct 2 includes a plurality of fixed pipe sections 22 and a plurality of movable pipe sections 23, each movable pipe section 23 being connected to one or more fixed pipe sections 22. That is, one fixed pipe section 22 can be connected to multiple movable pipe sections 23, and similarly, one movable pipe section 23 can be connected to multiple fixed pipe sections 22. This can be set according to the air distribution requirements inside the mask or helmet to increase the airflow to a specific area or balance the airflow to various areas.

[0081] According to another embodiment of the present invention, the duct 2 includes multiple fixed pipe sections 22 and multiple movable pipe sections 23, with the multiple fixed pipe sections 22 being fixedly connected to each other. That is, when there are multiple fixed pipe sections 22, they are not only fixed by the connecting strap 14, but each fixed pipe section 22 can also be fixed to each other to improve the stability of the fixation.

[0082] According to one embodiment of the present invention, the fixed tube portion 22 and the movable tube portion 23 are movably connected. Preferably, the fixed tube portion 22 and the movable tube portion 23 are connected by any one of the following: pivot connection, hinge connection, bearing connection, rotary joint connection, and universal joint connection. Preferably, the fixed tube portion 22 and the movable tube portion 23 are rotatably connected in the extending direction of the forehead portion 11.

[0083] The movable tube section can move relative to the fixed tube section, allowing it to be flexibly connected to different installation positions, thus adjusting the vent to different locations. For example, both the fixed and movable tube sections are made of rigid tubing, with a pivot at their connection point to achieve a pivotal connection. A flexible skin can be installed at the connection point to prevent air leakage. Alternatively, in a pivotal connection structure, one of the fixed or movable tube sections has a tapered connector that inserts into the other, preventing air leakage.

[0084] As will be understood by those skilled in the art, the duct in this invention can be any flexible tube, such as a corrugated pipe or a rubber hose, or a combination of rigid and flexible tubes, for example, a rigid tube for the fixed section and a flexible tube for the movable section. The duct in this invention can be a single, integrally formed tube or a segmented, assembled tube.

[0085] Figure 6 A schematic diagram of the duct's framework is shown.

[0086] Figure 7 A schematic diagram of the outer skin of the duct is shown.

[0087] like Figure 6 and Figure 7 As shown, the duct 2 includes a hollowed-out frame and an outer skin, with the outer skin wrapping around the frame to form an air supply passage. The frame can be a single piece or a frame made up of separate parts, as can the outer skin.

[0088] The overall frame is tubular, and its material includes any one of plastic, metal, carbon fiber, or an equivalent material with rigid support and slight elastic deformation. The outer skin is made of leather, fabric, or other equivalent material that forms gas passages. The hollowed-out tubular frame and outer skin significantly reduce the weight of duct 2.

[0089] According to one embodiment of the present invention, the inner surface of the outer skin is provided with an airtight coating to increase its airtightness. According to another embodiment of the present invention, the fabric outer skin has a certain degree of ventilation, allowing fresh air to fill the entire welding mask or protective helmet.

[0090] The fixed outer skin 221 and the movable outer skin 231 are different parts of the outer skin, and can be set separately or molded as one piece.

[0091] like Figure 6As shown, the fixed frame 220 of the fixed pipe section 22 is movably connected to the movable frame 230 of the movable pipe section 23. The fixed pipe section 22 is fixed by the connecting strap 14, and the orientation of the movable pipe section 23 can be adjusted from the position where it connects with the fixed pipe section 22. Since the shape of the duct 2 is mainly supported by the frame, when the duct 2 bends at this connection point, although the frame itself has a certain degree of elasticity, when the bending angle is large, the frame becomes an obstacle to adjusting the orientation or connection position of the movable pipe section 23.

[0092] In this invention, the frame is divided into two parts. One part is the fixed frame 220 of the fixed tube 22, which is fixed together with the fixed outer skin 221 of the fixed tube 22. The other part is the movable frame 230 of the movable tube 23, one end of which is connected to the fixed frame 220 of the fixed tube 22, and the other end extends to the forehead 11 to connect to different mounting positions, so that the movable tube 23 has a larger adjustment angle and more connection positions.

[0093] like Figure 6 As shown, the fixed frame 220 of the fixed tube section 22 and the movable frame 230 of the movable tube section 23 are pivotally connected. Those skilled in the art will understand that the connection can also be achieved using any of the following methods: hinge connection, bearing connection, rotary joint connection, and universal joint connection. Preferably, the fixed frame 220 of the fixed tube section 22 and the movable frame 230 of the movable tube section 23 are rotatably connected in the extension direction of the forehead section 11. For example, they are pivotally connected, with the rotation axis perpendicular to the extension direction of the forehead section 11. In this invention, by limiting the movable frame 230 of the movable tube section 23 to swing only in the extension direction of the forehead section 11, the adjustable function of the duct 2 is provided, while limiting the degree of freedom of the duct 2, thus providing a stable duct 2 structure.

[0094] Figure 8 A schematic diagram showing another angle of the duct's outer skin is shown.

[0095] like Figure 8 As shown, the surface of the fixed outer skin 221 of the fixed tube section 22 is provided with a first connector 222, which is fixedly connected to the connecting strap 14. The movable outer skin 231 of the movable tube section 23 is provided with a second connector 232, which is detachably connected to the forehead section 11.

[0096] Both the first connector 222 and the second connector 232 can be detachably connected, such as with Velcro, magnetic fasteners, snaps, or equivalent structures. The first connector 222 can also be fixedly connected, such as with a lasso or other equivalent structures. The connection between the first connector 222 and the connecting strap 14 can be achieved through various methods, such as point connection, multi-point connection, line connection, or surface connection, as can the connection between the second connector 232 and the forehead connecting part.

[0097] Figure 9 A schematic diagram of the wind direction adjustment component is shown.

[0098] like Figure 9 As shown, the ventilation opening of the movable pipe section 23 is provided with a wind direction adjustment component 24; the wind direction adjustment component 24 includes a support frame 241; a rotatable inner shell 242 with an inlet and an outlet is provided inside the support frame 241, and there is at least one rotation angle such that when the inner shell 242 rotates, the inlet is connected to the ventilation opening, and the outlet partially overlaps with the ventilation opening.

[0099] The inner shell 242 is provided with a rotatable paddle 243, and there is at least one rotation angle that changes the wind direction of the outlet of the inner shell 242 when the paddle 243 rotates; the inner shell 242 is provided with multiple teeth, and the paddle 243 is provided with a claw that matches the teeth. The claw is mounted on the teeth, so that the paddle 243 is limited by the cooperation of the claw and the teeth when it rotates.

[0100] The support frame 241 is fixed on the tubular skeleton of the air duct 2. When the inner shell 242 rotates along its rotation axis, it changes the airflow direction in the first direction. When the rotation angle of the inner shell 242 is large, the outlet and the ventilation opening partially overlap, which can adjust the airflow size.

[0101] When the paddle 243 rotates, it changes the direction of airflow in the second direction. Through the engagement of the teeth and claws, the paddle 243 can be fixed at different rotation angles. Preferably, the rotation direction of the paddle 243 is not parallel to the rotation direction of the inner shell 242, so that the first and second directions do not coincide, allowing the airflow direction to be changed in multiple directions.

[0102] Figure 10 A schematic diagram is shown showing the air supply mechanism connecting the air duct to the intermediate connection position.

[0103] like Figure 10 As shown, the air duct from Figure 1 Adjust the connection positions on both sides of the middle connection to the middle connection position, thereby adjusting the position of the vent.

[0104] The air supply mechanism provided by this utility model features a fixed duct section secured by a connecting strap, ensuring stable airflow. The movable duct section has multiple mounting positions, allowing for flexible adjustment of the duct's ventilation opening orientation. The duct extends from the wearer's head area, preventing interference between the duct and other components. The flexible duct allows for adjustment of the external connector's ventilation opening position and orientation. A support frame enhances the stability of the external connector. The support arm of the support frame, in conjunction with a support rail, ensures the external connector maintains a certain range of motion even when supported, accommodating different wearers. The movable connection between the fixed frame of the fixed duct section and the movable frame of the movable duct section increases the duct's adjustment angle. An airflow direction adjustment component provides airflow direction adjustment. A limiting component prevents the external connector from detaching. A restraining strap prevents the external connector from separating from the fixed duct section.

[0105] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An air supply mechanism, characterized in that, include: Headband (1) and air duct (2). The air duct (2) includes an external connector (21), a fixed pipe section (22), and a movable pipe section (23) connected in sequence. The air duct (2) extends from the occipital region of the wearer, around the top of the head, toward the forehead region of the wearer; The headband (1) has multiple mounting positions on the wearer's forehead area; The movable tube (23) is detachably connected to one of the mounting positions.

2. The air supply mechanism according to claim 1, characterized in that, include: The headband (1) includes a forehead portion (11) surrounding the forehead region, a back occipital portion (12) surrounding the occipital region, a top occipital portion (13) surrounding the top occipital region, and a connecting band (14) extending from the occipital region toward the top occipital region to connect to the top occipital portion (13). The air duct (2) extends from the back of the head (12) toward the forehead (11) along the extension direction of the connecting strip (14); At least one of the external connector (21) and the fixed tube (22) is fixedly connected to the connecting strip (14); Multiple mounting positions are provided on the forehead (11).

3. The air supply mechanism according to claim 1 or 2, characterized in that, The duct (2) includes a fixed duct section (22) and two or more movable duct sections (23), each of the movable duct sections (23) being connected to the fixed duct section (22); Alternatively, the duct (2) may include a plurality of fixed pipe sections (22) and a plurality of movable pipe sections (23) that are matched with each other, each of the movable pipe sections (23) being connected to the fixed pipe sections (22) that are matched with each other; Alternatively, the duct (2) may include a plurality of fixed duct sections (22) and a plurality of movable duct sections (23), each of the movable duct sections (23) being connected to one or more of the fixed duct sections (22). Alternatively, the duct (2) may include a plurality of fixed pipe sections (22) and a plurality of movable pipe sections (23), wherein the plurality of fixed pipe sections (22) are fixedly connected to each other.

4. The air supply mechanism according to claim 1 or 2, characterized in that, The duct (2) is a flexible duct, or at least the movable duct section (23) is a flexible duct.

5. The air supply mechanism according to claim 1 or 2, characterized in that, The fixed tube (22) is movably connected to the movable tube (23).

6. The air supply mechanism according to claim 5, characterized in that, The fixed tube section (22) and the movable tube section (23) are connected by any one of the following: pivot connection, hinge connection, bearing connection, rotary joint connection and universal joint connection.

7. The air supply mechanism according to claim 2, characterized in that, The fixed tube (22) and the movable tube (23) are rotatably connected in the extension direction of the forehead (11).

8. The air supply mechanism according to claim 1 or 2, characterized in that, The air duct (2) includes a hollowed-out frame and an outer skin, with the outer skin wrapping around the frame to form an air supply passage.

9. The air supply mechanism according to claim 8, characterized in that, The fixed frame (220) of the fixed tube (22) is movably connected to the movable frame (230) of the movable tube (23).

10. The air supply mechanism according to claim 9, characterized in that, The fixed frame (220) of the fixed tube section (22) and the movable frame (230) of the movable tube section (23) are connected by any one of the following: pivot connection, hinge connection, bearing connection, rotary joint connection and universal joint connection.

11. The air supply mechanism according to claim 2, characterized in that, The fixed frame (220) of the fixed tube (22) and the movable frame (230) of the movable tube (23) are rotatably connected in the extension direction of the forehead (11).

12. The air supply mechanism according to claim 8, characterized in that, The skeleton is made of any one of plastic, metal, or carbon fiber.

13. The air supply mechanism according to claim 2, characterized in that, The surface of the fixing outer skin (221) of the fixing tube (22) is provided with a first connector (222), and the first connector (222) is fixedly connected to the connecting strip (14); And / or, The movable outer skin (231) of the movable tube (23) is provided with a second connector (232), which is detachably connected to the forehead (11).

14. The air supply mechanism according to claim 2, characterized in that, The headband (1) also includes a restraint strap (15) with its two ends respectively connected to the connecting strap (14) and the outer connector (21). The binding strap (15) surrounds the starting end of the fixed tube (22) and binds the starting end of the fixed tube (22) to the external connector (21).

15. The air supply mechanism according to claim 2, characterized in that, A support frame (3) is provided between the back of the head (12) and the external connector (21). The support frame (3) includes a support leg (31) mounted on the back of the head and a support arm (32) that is substantially parallel to the axial direction of the external connector (21). The support arm (32) is slidably connected to the support rail (211) provided on the outer connector (21) or the connecting strip (14).

16. The air supply mechanism according to claim 15, characterized in that, The occipital portion (12) has a first end (121), a second end (122) and an adjustment portion (123). The adjustment unit (123) selectively adjusts the length of the occipital region (12) by adjusting the relative movement of the first end (121) and the second end (122); The support leg (31) is mounted on the adjustment part (123).

17. The air supply mechanism according to claim 15 or 16, characterized in that, The end of the support arm (32) is provided with a limiting member (321). The limiting member (321) restricts the sliding displacement of the support arm on the support rail (211).

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