Dustproof mask

Abstract

The invention provides a dustproof mask, and belongs to the technical field of wearable equipment. The dustproof mask comprises a mask body and an air inlet disc, air inlet cylinders are arranged on the two sides of the mask body, sleeves used for being arranged outside the air inlet cylinders in a threaded and sleeving mode are arranged on the air inlet disc, an inner butt joint ring and an outer butt joint ring are arranged in the air inlet cylinders and the sleeves respectively, and an inner filter screen and an outer filter screen are arranged in the butt joint ends of the inner butt joint ring and the outer butt joint ring respectively. Half shafts with semicircular sections are arranged on the two sides of the inner filter screen and the two sides of the outer filter screen, when the sleeve is screwed in from the outside of the air inlet cylinder, the inner filter screen and the outer filter screen rotate by degrees with the half shafts as the centers to achieve position switching, and when the sleeve is separated from the outside of the air inlet cylinder, the outer filter screen stays on the inner butt joint ring, and the inner filter screen leaves the air inlet cylinder along with the outer butt joint ring. The device has the advantages that workers are allowed to directly replace the air inlet disc and the filter screen in a working environment, the operation is simple, and the structure is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable devices, and in particular to a dust mask. Background Art

[0002] In a working environment with a high dust content, a dust mask is one of the necessary work tools for workers. By wearing a dust mask, workers can avoid inhaling a large amount of dust, thereby protecting their bodies from damage. During the work process, the filter on the dust mask needs to be removed and replaced after a period of use. However, since the filter is generally arranged in the air intake duct, when removing the filter, in order to prevent the workers from inhaling dust, the removal operation requires the workers to leave the original workplace and return to the work station after the filter is replaced. This method requires the workers to suspend the work at hand, and it takes a long time, which is time-consuming and inconvenient. At present, in response to this situation, there are also some solutions in the prior art to solve the above problems.

[0003] For example, the patent with publication number CN118001628A provides a dust mask, including a mask that fits the face and a filter box that can be detachably mounted on the mask, the filter box including a rear cover that can be detachably mounted on the mask and a front cover mounted on the rear cover, the front cover and the rear cover enclose a filter cavity, a driving member is installed in the filter cavity, an extrusion frame is slidably provided on the driving member, both ends of the driving member are provided with a body and a accommodating cavity opened on the body, an active member is rotatably provided in one of the accommodating cavities, a driven member is rotatably provided in the other accommodating cavity, the active member and the driven member have a torsional force with opposite rotation directions, a filter element is rolled on the driven member, and the end of the filter element passes through the extrusion frame and is rolled on the active member; an elastic member is also installed in the rear cover, the elastic member is used to push the extrusion frame to press the filter strip against the front cover; an air inlet hole that exposes the filter element is provided on the front cover, and an air inlet hole connected to the mask is provided on the rear cover; the filter part can be replaced without disassembling the filter element in a working environment, thereby improving the filtering effect.

[0004] Although the dust mask in the above-mentioned prior art can realize the replacement of the filtering part of the filter element directly in the working environment, it has a complex structure and high cost. At the same time, the energy consumption and weight are both large. Especially after the filter element is completely used, when replacing the entire roll of filter element, it is still unavoidable that the worker needs to leave the working environment, resulting in that the worker can only directly replace the filtering part of the filter element in the working environment to a certain extent. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a dust mask.

[0006] The technical solution of the present invention is achieved in this way: A dust mask comprises a mask and an air inlet disk, wherein air inlet cylinders are arranged on both sides of the mask, and the air inlet disk is provided with a sleeve for being threadedly mounted on the outside of the air inlet cylinder, an inner docking ring and an outer docking ring are respectively arranged in the air inlet cylinder and the sleeve, an inner filter screen and an outer filter screen are respectively arranged inside the docking ends of the inner docking ring and the outer docking ring, and semi-axes with semicircular cross-sections are arranged on both sides of the inner filter screen and the outer filter screen, when the sleeve is screwed into the outside of the air inlet cylinder, the inner filter screen and the outer filter screen switch their positions by rotating ° around the semi-axes as the center, and when the sleeve is separated from the outside of the air inlet cylinder, the outer filter screen stays on the inner docking ring, and the inner filter screen follows the outer docking ring to leave the air inlet cylinder.

[0007] Furthermore, the inner docking ring is slidably arranged in the air intake cylinder, a support spring is arranged in the air intake cylinder, the outer end of the support spring is supported on the inner end face of the inner docking ring, and the support spring is used to keep the end face of the docking end of the inner docking ring flush with the outer end face of the air intake cylinder.

[0008] Furthermore, when the inner butt joint ring is butt jointed with the outer butt joint ring, the butt ends of the inner butt joint ring and the outer butt joint ring fit together, and the butt ends of the inner filter screen and the outer filter screen fit together.

[0009] Furthermore, when the inner filter screen is connected to the outer filter screen, a receiving groove is formed between the inner filter screen and the outer filter screen.

[0010] Furthermore, strip grooves for shaft displacement are provided on both sides of the air intake cylinder, the width of the strip grooves is adapted to the outer diameter of the half-shaft, a row of retractable ratchets are provided on the inner wall of one side of the strip grooves, and a group of ratchet grooves are equidistantly provided on the outside of the half-shafts. When the two half-shafts are butt-jointed, the two groups of ratchet grooves form a circle, and when the sleeve is screwed into the outside of the air intake cylinder, the ratchet grooves engage with the ratchets to rotate the inner filter and the outer filter.

[0011] Furthermore, the inner docking ring has the same outer diameter as the outer docking ring, the outer diameter of the inner docking ring has the same inner diameter as the air intake cylinder, and the outer end surface of the half shaft and the outer surface of the air intake cylinder are located on the same circumferential surface.

[0012] Further, the air intake cylinder includes a first cylinder and a second cylinder distributed inside and outside, the outer diameter of the first cylinder is larger than the outer diameter of the second cylinder, the inner end of the first cylinder is fixedly connected to the mask, and the surface of the first cylinder is provided with screw threads. The sleeve includes a third cylinder and a fourth cylinder distributed inside and outside, the inner wall surface of the third cylinder is provided with screw threads matched with the first cylinder, the inner diameter of the fourth cylinder is set to match the outer diameter of the second cylinder, and the strip groove is opened on the second cylinder, and the length of the second cylinder is greater than the length of the third cylinder.

[0013] Furthermore, grooves are provided on the upper and lower sides of the docking ends of the inner docking ring and the outer docking ring, and limiting blocks are provided in the grooves. The inner filter screen and the outer filter screen are provided with a first limiting groove and a second limiting groove for inserting two limiting blocks respectively, and the first limiting groove and the second limiting groove are open toward the side of the docking end, and a limiting spring is provided in the groove for providing elastic force for the two limiting blocks to be inserted into the first limiting groove and the second limiting groove respectively.

[0014] Furthermore, the limit block includes an axial part, a radial part vertically arranged on the side of the axial part toward the butt end, and a tip part arranged at the front end of the radial part. The first limit groove and the second limit groove both include an inclined wall groove cavity adapted to the side of the tip part away from the butt end. The first limit groove also includes a straight wall groove cavity extending radially outward from the inclined wall groove cavity. When the limit block is inserted into the first limit groove, the side of the radial part away from the butt end contacts the straight wall groove cavity. When the limit block is inserted into the second limit groove, the tail end of the tip part is located outside the second limit groove. The first limit groove on the inner butt ring is located at the top, and the first limit groove on the outer butt ring is located at the bottom.

[0015] Furthermore, when the limit block is inserted into the first limit groove, the side surface of the axial part facing the center of the air intake cylinder is supported on the side surface of the groove facing the center of the air intake cylinder, and the side of the circumferential surface of the inner filter and the outer filter away from the docking end is an arc surface centered on the semi-axis, and the circumference of the arc surface is located within the range of the inclined wall groove cavity of the first limit groove, and the circumference of the bottom end of the inclined wall groove cavity in the second limit groove is located within the range of the inclined wall groove cavity of the first limit groove.

[0016] The present invention has the following beneficial effects: By setting up an inner filter, the air entering the air intake cylinder can be filtered after the air intake disc is removed, so that the dust mask allows the staff to directly replace the air intake disc in the work area. At the same time, in the process of replacing the air intake disc, the position of the inner filter on the air intake cylinder and the outer filter on the newly installed air intake disc is switched. In the next process of removing the air intake disc, the original inner filter will be removed along with the air intake disc, while the outer filter in the original air intake disc will remain in the air intake cylinder. Furthermore, each time the air intake disc is replaced, the inner filter in the air intake cylinder is also replaced, which is effective and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the dust mask of the present invention being in a state of close contact between the inner docking ring and the outer docking ring during the process of installing the air intake disk; Figure 2 The present invention Figure 1 Enlarged view of point A in the middle; Figure 3 It is a partial split schematic diagram of the present invention; Figure 4 The present invention Figure 3 Enlarged view of point B in the middle; Figure 5 The present invention Figure 3 Another perspective of the picture; Figure 6 It is a schematic diagram of the disassembly of the outer docking ring and the outer filter screen of the present invention; Figure 7 The present invention Figure 6 Enlarged view of point C in the middle; Figure 8 The present invention Figure 6 Enlarged view of point D in the middle; Fig. 9 The present invention Figure 1 Schematic diagram of the middle air intake cylinder, sleeve, inner docking ring and outer docking ring after being cut apart; Fig.10 The present invention Fig. 9 Enlarged view of point E in the middle; Fig.11 The present invention Fig. 9 Enlarged view of point F in the middle; Fig.12 It is a schematic diagram of the telescopic slot of the present invention.

[0019] In the figure: 1. mask; 2. air intake disc; 3. air intake cylinder; 3-1. first cylinder; 3-2. second cylinder; 4. sleeve; 4-1. third cylinder; 4-2. fourth cylinder; 5. inner docking ring; 6. outer docking ring; 7. inner filter; 8. outer filter; 9. half shaft; 10. support spring; 11. accommodating groove; 12. strip groove; 13. ratchet; 14. ratchet groove; 15. groove; 16. limit block; 16-1. axial part; 16-2. radial part; 16-3. tip part; 17. first limit groove; 18. second limit groove; 19. limit spring; 20. inclined wall groove; 21. straight wall groove; 22. telescopic groove; 23. telescopic spring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, in the description of the present application, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0023] like Figures 1 to 12As shown, a dust mask provided in this embodiment includes a mask 1 and an air inlet disk 2, air inlet cylinders 3 are arranged on both sides of the mask 1, and a sleeve 4 for threadedly sleeved to the outside of the air inlet cylinder 3 is arranged on the air inlet disk 2, an inner docking ring 5 and an outer docking ring 6 are respectively arranged in the air inlet cylinder 3 and the sleeve 4, an inner filter screen 7 and an outer filter screen 8 are respectively arranged inside the docking ends of the inner docking ring 5 and the outer docking ring 6, and semi-shafts 9 with semicircular cross-sections are arranged on both sides of the inner filter screen 7 and the outer filter screen 8. When the sleeve 4 is screwed into the outside of the air inlet cylinder 3, the inner filter screen 7 and the outer filter screen 8 are switched in position by rotating 180° around the semi-shaft 9, and when the sleeve 4 is separated from the outside of the air inlet cylinder 3, the outer filter screen 8 stays on the inner docking ring 5, and the inner filter screen 7 follows the outer docking ring 6 to leave the air inlet cylinder 3.

[0024] When the air intake disc 2 is separated from the mask 1, the inner filter 7 is located at the outer end of the air intake cylinder 3, and the inner filter 7 can filter the air entering the air intake cylinder 3. When the air intake disc 2 is installed on the mask 1, the outer docking ring 6 is tightly attached to the inner docking ring 5. At this time, the two half shafts 9 on the same side are docked to form a complete shaft structure. Then, the sleeve 4 is rotated so that the sleeve 4 is screwed into the outside of the air intake cylinder 3. During this process, the inner filter 7 and the outer filter 8 can be rotated 180° with the center of the half shaft 9 as the center of the circle, so that the position of the inner filter 7 and the outer filter 8 can be switched. Furthermore, in the process of replacing the air intake disc 2, the inner filter 7 located in the air intake cylinder 3 can be replaced by the outer filter 8 in the new air intake disc 2 after replacement, and when the air intake disc 2 is removed, the replaced inner filter 7 is removed together.

[0025] In this way, not only the replacement of the air intake disc 2 is achieved, but also the replacement of the inner filter 7 in the air intake cylinder 3 is achieved. At the same time, during the process of replacing the air intake disc 2, the replaced inner filter 7 is always retained in the air intake cylinder 3 to prevent dust from being inhaled by workers. Furthermore, the air intake disc 2 can be replaced directly at the worker's workplace.

[0026] In addition, after each replacement of the air intake disk 2, the inner filter 7 originally retained in the air intake pipe will move to the side of the air intake cylinder 3 away from the mask 1, and the outer filter 8 on the newly replaced air intake disk 2 will move to the side of the air intake cylinder 3 close to the mask 1, so that the outer filter 8 close to the mouth and nose of the workers is always unused, more hygienic and clean, so as to better protect the workers' bodies from damage by environmental dust.

[0027] The inner docking ring 5 is slidably arranged in the air intake cylinder 3, and a support spring 10 is arranged in the air intake cylinder 3. The outer end of the support spring 10 is supported on the inner end face of the inner docking ring 5, and the support spring 10 is used to keep the end face of the docking end of the inner docking ring 5 flush with the outer end face of the air intake cylinder 3. When the inner docking ring 5 is docked with the outer connecting ring, the docking ends of the inner docking ring 5 and the outer docking ring 6 fit together, and the docking ends of the inner filter screen 7 and the outer filter screen 8 fit together.

[0028] After the air intake disc 2 is removed, the outer filter 8 retained on the inner docking ring 5 is located at the outermost end of the air intake cylinder 3, which can prevent environmental dust from entering the air intake cylinder 3. During the installation of the air intake disc 2, the outer docking ring 6 is inserted into the air intake cylinder 3, so that the inner docking ring 5 moves inward in the air intake cylinder 3, and the support spring 10 is compressed, so that after the air intake disc 2 is installed, the inner docking ring 5 and the outer docking ring 6 are both located in the air intake cylinder 3. At this time, the inner docking ring 5 and the outer docking ring 6 can fit more closely under the limiting effect of the air intake cylinder 3. In addition, the cooperation between the inner docking ring 5 and the outer docking ring 6 can also seal the air intake cylinder 3 more tightly with the external environment, so that the air entering the air intake cylinder 3 from the air intake disc 2 will all pass through the outer filter 8 and the inner filter 7.

[0029] During the process of removing the air intake disc 2, the inner docking ring 5 and the outer docking ring 6 will both move outward in the air intake cylinder 3, and during this process, the support spring 10 ensures that the inner docking ring 5 and the outer docking ring 6 always remain in close contact with each other, and the outer docking ring 6 can be separated from the inner docking ring 5 after moving to the outside of the air intake cylinder 3, thereby preventing dust between the inner filter screen 7 and the outer filter screen 8 from falling into the air intake cylinder 3.

[0030] When the inner filter 7 is docked with the outer filter 8, a receiving groove 11 is formed between the inner filter 7 and the outer filter 8. Specifically, the inner filter 7 and the outer filter 8 both include a ring body portion and a mesh body portion, and an extension portion extends forward relative to the mesh body portion on one side of the ring body portion facing the docking end. When the inner filter 7 is docked with the outer filter 8, a receiving groove 11 is formed between the two extension portions. With such a configuration, after the new air intake plate 2 is installed, the receiving groove 11 makes the dust distribution between the inner filter 7 and the outer filter 8 looser, so that the inner filter 7 and the outer filter 8 have good air circulation performance, and have a better air supply effect on the workers' breathing. Both sides of the air intake cylinder 3 are provided with strip grooves 12 for shaft displacement. The width of the strip grooves 12 is adapted to the outer diameter of the half shaft 9. A row of retractable ratchets 13 are provided on the inner wall of one side of the strip grooves 12. A group of ratchet grooves 14 are equidistantly provided on the outside of the half shaft 9. When the two half shafts 9 are butted, the two groups of ratchet grooves 14 form a circle, and when the sleeve 4 is screwed in outside the air intake cylinder 3, the ratchet grooves 14 mesh with the ratchet 13 to rotate the inner filter 7 and the outer filter 8. The strip grooves 12 are provided with telescopic grooves 22 for accommodating the ratchet 13. The telescopic springs 23 are provided in the telescopic grooves 22. The telescopic springs 23 provide elastic force for the ratchet 13 to stay extended out of the telescopic grooves 22. The side of the ratchet 13 facing the butt end is a plane parallel to the radial direction of the air intake cylinder 3, and the side of the ratchet 13 away from the butt end is an inclined surface.

[0031] Specifically, when the inner docking ring 5 and the outer docking ring 6 are docked, the two half shafts 9 on the same side of the inner docking ring 5 and the outer docking ring 6 are docked, and the ratchet grooves 14 on the outside of the two half shafts 9 form a complete circle, and a circle of ratchet grooves 14 are distributed in a circular array outside the two half shafts 9. When the sleeve 4 is screwed into the outside of the air intake cylinder 3, the two shaft bodies in the docking state will move in the strip groove 12, and the two shaft bodies will rotate synchronously by using the meshing of the ratchet groove 14 and the ratchet 13, and then, when the air intake disc 2 is installed, the rotation and position switching of the inner filter 7 and the outer filter 8 are realized synchronously. When the sleeve 4 is rotated into the maximum stroke outside the air intake cylinder 3, the air intake disc 2 is installed. At this time, the ratchet 13 and the ratchet groove 14 remain in a meshing state, and one of the half shafts 9 contacts the side wall of the strip groove 12, which can achieve the locking of the half shaft 9, and then, the inner filter 7 and the outer filter 8 are locked in the original rotation direction.

[0032] The outer diameter of the inner docking ring 5 is the same as that of the outer docking ring 6 , the outer diameter of the inner docking ring 5 is the same as the inner diameter of the air intake cylinder 3 , and the outer end surface of the half shaft 9 and the outer surface of the air intake cylinder 3 are located on the same circumferential surface.

[0033] The air intake cylinder 3 includes a first cylinder 3-1 and a second cylinder 3-2 which are distributed inside and outside. The outer diameter of the first cylinder 3-1 is larger than the outer diameter of the second cylinder 3-2. The inner end of the first cylinder 3-1 is fixedly connected to the mask 1. The surface of the first cylinder 3-1 is provided with screw threads. The sleeve 4 includes a third cylinder 4-1 and a fourth cylinder 4-2 which are distributed inside and outside. The inner wall surface of the third cylinder 4-1 is provided with screw threads which are matched with the first cylinder 3-1. The inner diameter of the fourth cylinder 4-2 is set to be matched with the outer diameter of the second cylinder 3-2, and the strip groove 12 is opened on the second cylinder 3-2. The length of the second cylinder 3-2 is larger than the length of the third cylinder 4-1.

[0034] When installing the air intake disc 2, when the outer docking ring 6 is tightly attached to the outer docking ring 6 at the docking end, the fourth cylinder 4-2 has been put on the second cylinder 3-2. At this time, the fourth cylinder 4-2 and the second cylinder 3-2 are used to provide guidance for the forward displacement of the third cylinder 4-1, and the two half shafts 9 can be accurately docked.

[0035] Grooves 15 are provided on the upper and lower sides of the docking ends of the inner docking ring 5 and the outer docking ring 6, and a limit block 16 is provided in the groove 15. The inner filter screen 7 and the outer filter screen 8 are provided with a first limit groove 17 and a second limit groove 18 for inserting the two limit blocks 16 respectively. The first limit groove 17 and the second limit groove 18 are open toward one side of the docking end, and a limit spring 19 is provided in the groove 15 for providing elastic force for the two limit blocks 16 to be inserted into the first limit groove 17 and the second limit groove 18 respectively.

[0036] The limit block 16 is used for the rotation of the inner filter 7 and the outer filter 8 by compressing the limit spring 19 radially outward to leave the inner filter 7 and the outer filter 8. The groove 15 provides space for the limit block 16 to move outward and install the limit spring 19. At the same time, the elastic force of the limit spring 19 is used to make the two limit blocks 16 insert into the first limit groove 17 and the second limit groove 18 respectively, so as to prevent the inner filter 7 from being separated from the air intake cylinder 3 and the outer filter 8 from falling off the air intake disc 2.

[0037] The limit block 16 includes an axial portion 16-1, a radial portion 16-2 vertically arranged on the side of the axial portion 16-1 toward the butt end, and a tip portion 16-3 arranged at the front end of the radial portion 16-2. The first limit groove 17 and the second limit groove 18 both include an oblique wall groove cavity 20 adapted to the side of the tip portion 16-3 away from the butt end. The first limit groove 17 also includes a straight wall groove cavity 21 extending radially outward from the oblique wall groove cavity 20. When the limit block 16 is inserted into the first limit groove 17, the side of the radial portion 16-2 away from the butt end contacts the straight wall groove cavity 21. When the limit block 16 is inserted into the second limit groove 18, the tail end of the tip portion 16-3 is located outside the second limit groove 18. The first limit groove 17 on the inner butt ring 5 is located at the top, and the first limit groove 17 on the outer butt ring 6 is located at the bottom.

[0038] By utilizing the elastic force of the limit spring 19, in the initial state, the inner filter 7 can be stably mounted on the inner docking ring 5, and the outer filter 8 can be stably mounted on the outer docking ring 6. The inner filter 7 on the inner docking ring 5 is limited by the straight wall groove 21 of the first limit groove 17 and the radial portion 16-2 of the upper limit block 16, and cannot rotate toward the docking side, so that the inner filter 7 can only rotate away from the docking side.

[0039] The outer filter screen 8 on the outer docking ring 6 is limited by the straight wall groove cavity 21 of the first limiting groove 17 and the radial portion 16-2 of the limiting block 16 below, and cannot rotate the top end away from the docking side, so that the outer filter screen 8 can only rotate the top end toward the docking side.

[0040] The above arrangement is made so that during the installation of the air intake disc 2, the inner filter 7 and the outer filter 8 can only rotate in one direction. After the air intake disc 2 is installed, the ratchet 13 cooperates with the ratchet groove 14 to lock the inner filter 7 and the outer filter 8 in the rotation direction. At the same time, the first limit groove 17 cooperates with the limit groove to lock the inner filter 7 and the outer filter 8 in the opposite rotation direction. In this way, the inner filter 7 and the outer filter 8 can be locked on both sides of their rotation direction, ensuring that during the normal use of the dust mask, the inner filter 7 and the outer filter 8 are stable in the state of filtering dust.

[0041] The side surface of the axial portion 16-1 facing the center of the air intake cylinder 3 is supported on the side surface of the groove 15 facing the center of the air intake cylinder 3, and the side of the circumferential surface of the inner filter 7 and the outer filter 8 away from the docking end is an arc surface centered on the semi-axis 9, and the circumference where the arc surface is located is located within the range of the inclined wall groove cavity 20 of the first limiting groove 17, and the circumference where the bottom end of the inclined wall groove cavity 20 in the second limiting groove 18 is located is located within the range of the inclined wall groove cavity 20 of the first limiting groove 17.

[0042] Specifically, during the process of installing the air intake plate 2 and the inner filter 7 and the outer filter 8 switching positions through rotation, the limit block 16 inserted in the first limit groove 17 on the inner filter 7 will be squeezed upward by the bottom of the groove opening of the inclined wall groove cavity 20 of the second limit groove 18 on the outer filter 8, and the limit block 16 inserted in the second limit groove 18 on the outer filter 8 will be squeezed upward by the side wall of the inclined wall groove cavity 20 of the second limit groove 18, thereby causing the two limit blocks 16 located above to move upward.

[0043] Similarly, the limit block 16 inserted into the second limit groove 18 on the inner filter 7 will be squeezed downward by the side wall of the inclined wall groove cavity 20 of the second limit groove 18 on the inner filter 7, and the limit block 16 inserted into the first limit groove 17 on the outer filter 8 will be squeezed downward by the top of the groove opening of the inclined wall groove cavity 20 of the second limit groove 18 on the inner filter 7, thereby causing the two limit blocks 16 located below to move downward.

[0044] After the stop blocks 16 are separated from the inner filter 7 and the outer filter 8, under the action of the lower spring, the four stop blocks 16 will all return to the state when they are inserted into the first stop groove 17. When the inner filter 7 and the outer filter 8 rotate 180°, the arcuate surfaces of the inner filter 7 and the outer filter 8 will push the stop blocks 16 passing through away from the center of the air intake cylinder 3, so that the stop blocks 16 can be reinserted into the first stop groove 17 or the second stop groove 18.

[0045] During the process of removing the air intake plate 2, since the inner filter screen 7 and the outer filter screen 8 cannot rotate in the reverse direction, the half shaft 9 is kept stationary in the circumferential direction and moves outward in the strip groove 12. During this process, the ratchet groove 14 synchronously and continuously squeezes the ratchet 13 to pass over the ratchet 13. At the same time, the half shaft 9 on the original outer filter screen 8 on the inner docking ring 5 will pass over the ratchet 13 under the action of the support spring 10. At this time, the support spring 10 provides a force for the outer docking ring 6 to drive the half shaft 9 on the original outer filter screen 8 to squeeze the ratchet 13, and at the same time, the inner docking ring 5 and the outer docking ring 6 are kept in a close contact state.

[0046] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A dust mask, characterized in that: The invention comprises a mask (1) and an air intake disk (2), wherein both sides of the mask (1) are provided with an air intake cylinder (3), the air intake disk (2) is provided with a sleeve (4) for being threadedly sleeved on the outside of the air intake cylinder (3), the air intake cylinder (3) and the sleeve (4) are respectively provided with an inner docking ring (5) and an outer docking ring (6), the inner ends of the inner docking ring (5) and the outer docking ring (6) are respectively provided with an inner filter screen (7) and an outer filter screen (8), the inner filter screen (7) and the outer filter screen (8) are respectively provided with an inner filter screen (7) and an outer filter screen (8) A semi-circular cross-section semi-shaft (9) is provided on both sides of the filter (8); when the sleeve (4) is screwed into the outside of the air intake cylinder (3), the inner filter (7) and the outer filter (8) are switched in position by rotating 180° around the semi-shaft (9); and when the sleeve (4) is separated from the outside of the air intake cylinder (3), the outer filter (8) stays on the inner docking ring (5), and the inner filter (7) follows the outer docking ring (6) to leave the air intake cylinder (3).

2. A dust mask as claimed in claim 1, characterized in that: The inner docking ring (5) is slidably arranged in the air intake cylinder (3), and a support spring (10) is arranged in the air intake cylinder (3). The outer end of the support spring (10) is supported on the inner end surface of the inner docking ring (5), and the support spring (10) is used to keep the end surface of the docking end of the inner docking ring (5) flush with the outer end surface of the air intake cylinder (3).

3. A dust mask as claimed in claim 1, characterized in that: When the inner butt joint ring (5) is butt jointed with the outer connecting ring, the butt joint ends of the inner butt joint ring (5) and the outer butt joint ring (6) fit together, and the butt joint ends of the inner filter screen (7) and the outer filter screen (8) fit together.

4. A dust mask as claimed in claim 1, characterized in that: When the inner filter (7) and the outer filter (8) are butt-jointed, a receiving groove (11) is formed between the inner filter (7) and the outer filter (8).

5. A dust mask as claimed in claim 2, characterized in that: Both sides of the air intake cylinder (3) are provided with strip grooves (12) for shaft displacement, the width of the strip grooves (12) being adapted to the outer diameter of the semi-axle (9), a row of retractable ratchet teeth (13) being provided on the inner wall of one side of the strip grooves (12), a group of ratchet grooves (14) being equidistantly provided on the outside of the semi-axle (9), when the two semi-axles (9) are butt-jointed, the two groups of ratchet grooves (14) form a circle, and when the sleeve (4) is screwed into the outside of the air intake cylinder (3), the ratchet grooves (14) mesh with the ratchet teeth (13) to rotate the inner filter (7) and the outer filter (8).

6. A dust mask as claimed in claim 5, characterized in that: The inner docking ring (5) and the outer docking ring (6) have the same outer diameter, the outer diameter of the inner docking ring (5) is the same as the inner diameter of the air intake cylinder (3), and the outer end surface of the half shaft (9) and the outer surface of the air intake cylinder (3) are located on the same circumferential surface.

7. A dust mask as claimed in claim 5, characterized in that: The air inlet cylinder (3) comprises a first cylinder (3-1) and a second cylinder (3-2) which are arranged inside and outside, the outer diameter of the first cylinder (3-1) is larger than the outer diameter of the second cylinder (3-2), the inner side end of the first cylinder (3-1) is fixedly connected to the mask (1), and the surface of the first cylinder (3-1) is provided with screw threads, and the sleeve (4) comprises a third cylinder (4-1) and a fourth cylinder (4-2) which are arranged inside and outside, the inner wall surface of the third cylinder (4-1) is provided with screw threads which match the first cylinder (3-1), the inner diameter of the fourth cylinder (4-2) is arranged to match the outer diameter of the second cylinder (3-2), and the strip groove (12) is provided on the second cylinder (3-2), and the length of the second cylinder (3-2) is larger than the length of the third cylinder (4-1).

8. A dust mask as claimed in claim 5, characterized in that: Grooves (15) are provided on both upper and lower sides of the butt ends of the inner butt ring (5) and the outer butt ring (6); a limit block (16) is provided in the groove (15); a first limit groove (17) and a second limit groove (18) are provided on the inner filter (7) and the outer filter (8) for inserting the two limit blocks (16) respectively; the first limit groove (17) and the second limit groove (18) are open toward one side of the butt ends; a limit spring (19) is provided in the groove (15) for providing elastic force for the two limit blocks (16) to be inserted into the first limit groove (17) and the second limit groove (18) respectively.

9. A dust mask as claimed in claim 8, characterized in that: The limiting block (16) comprises an axial portion (16-1), a radial portion (16-2) arranged vertically on the axial portion (16-1) toward the butt end, and a tip portion (16-3) arranged at the front end of the radial portion (16-2); the first limiting groove (17) and the second limiting groove (18) both comprise an oblique wall groove cavity (20) adapted to a side of the tip portion (16-3) away from the butt end; the first limiting groove (17) also comprises a radially extending groove cavity extending from the oblique wall groove cavity (20). The straight-wall groove cavity (21) extends outward, when the limit block (16) is inserted into the first limit groove (17), the side of the radial portion (16-2) away from the butt end contacts the straight-wall groove cavity (21), when the limit block (16) is inserted into the second limit groove (18), the tail end of the tip portion (16-3) is located outside the second limit groove (18), the first limit groove (17) on the inner butt ring (5) is located at the top, and the first limit groove (17) on the outer butt ring (6) is located at the bottom.

10. A dust mask as claimed in claim 9, characterized in that: When the limit block (16) is inserted into the first limit groove (17), the side surface of the axial portion (16-1) facing the center of the air intake cylinder (3) is supported on the side surface of the groove (15) facing the center of the air intake cylinder (3), and the side of the circumferential surface of the inner filter (7) and the outer filter (8) away from the butt end is an arc surface centered on the semi-axis (9), and the circumference of the arc surface is located within the range of the inclined wall groove cavity (20) of the first limit groove (17), and the circumference of the bottom end of the inclined wall groove cavity (20) in the second limit groove (18) is located within the range of the inclined wall groove cavity (20) of the first limit groove (17).

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