Protective mask

Abstract

The protective mask comprises a mask face part, a wearing rope, a mask nose part connected to the upper portion of the mask face part and a bottom supporting part connected to the lower portion of the mask face part, and the bottom supporting part can adapt to the bottom of the lower jaw in a covering mode; a breathing valve is arranged on the mask face part, a filtering assembly is arranged in the breathing valve, fishtail edges are arranged on the edges of side wings on the two sides of the mask face part, two fixing point positions used for fixing the two ends of a wearing rope are arranged on the fishtail edge on one side, the wearing rope bypasses the head of a user and then is connected with the breathing valve on the other side in a hanging mode, and a flexible supporting piece is arranged on the nose mask part. The somatosensory heating cloth and the nose pad structure are arranged on the inner side of the mask, so that the upper portion of the mask is tightly attached to the nose, the wearing sealing performance and the protection effect are improved, and the occurrence probability of the glasses fogging problem caused by the fact that exhaled air leaks from the nose of the mask in winter is reduced; according to the mask, the bottom supporting part is made of the elastic cloth, the mask can adapt to faces of various contour sizes, and therefore the mask can filter and exhaust gas exhaled by a wearer, the wearing comfort is high, and the protection effect is good.

Description

Technical Field

[0001] The present application relates to the technical field of sanitary products, and in particular to a protective mask. Background Art

[0002] The KN95 masks on the market can filter at least 95% of non-oily particles and provide a good air filtration effect. Although its design that fits the face tightly can improve the sealing, it also causes discomfort to the wearer, especially when used for a long time, the user's ear roots are easily strangled or injured. Furthermore, the existing KN95 masks are equipped with a breathing valve, which is usually an openable structure with a spring. The valve body is provided with an exhaust hole. When the wearer exhales, the valve body will open to allow the gas to be discharged smoothly. At the same time, the valve body is closed when inhaling to prevent the outside air from entering directly. Therefore, although the breathing valve set in the existing KN95 mask can reduce the internal pressure and improve the air permeability when exhaling, the gas exhaled by the user will be discharged directly from the valve port. In some places with high hygiene requirements, the existing KN95 masks are not applicable. Therefore, there are still many defects in the existing masks, and it is necessary to propose a new technical solution to solve the problems existing in the prior art. Utility Model Content

[0003] The present application provides a protective mask to solve the problem that the existing KN95 mask directly discharges the gas exhaled by the wearer and is not suitable for places with high hygiene requirements.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] The present application provides a protective mask, comprising a mask face portion, a wearing rope, a mask nose portion connected above the mask face portion, and a base portion connected below the mask face portion, wherein the base portion can adapt to the bottom of the mandible provided with the mask; the mask face portion comprises a first face body and a second face body which are arranged opposite to each other and at an angle to each other, wherein a connection line between the first face body and the second face body corresponds to the midline of the face, and a breathing valve is arranged on the outer side surface of the first face body, wherein the breathing valve comprises a bottom cover mounted on the first face body and a valve body detachably connected to the bottom cover, wherein an exhaust hole and a connector column are arranged on the bottom cover, and the valve body comprises a columnar shell, wherein a groove is arranged at one end of the columnar shell, wherein a connector tube which is adapted to be plugged in with the connector column is arranged in the groove, and an air vent is arranged at the bottom of the groove, and an installation space for installing a filter assembly is formed between the other end of the columnar shell and the groove, and an exhaust port is arranged on the end surface of the columnar shell which is away from the bottom cover.

[0006] Furthermore, in the above technical solution, a first fixed point and a second fixed point are provided at the side edge of the second surface, and the first fixed point and the second fixed point are spaced apart from each other. After one end of the wearing rope is connected and fixed to the first fixed point, the wearing rope is passed around the back of the wearer's head and wrapped around the outer shell of the breathing valve, and then wrapped back from the back of the wearer's head to the second fixed point and connected and fixed to the second fixed point.

[0007] Furthermore, the wearing rope is an elastic rope.

[0008] Furthermore, the flank edge of the first face body away from the second face body is in a fishtail shape, and the flank edge of the second face body away from the first face body is in a fishtail shape, and the fishtail shape is composed of a first convex arc and a second convex arc connected by a smooth transition.

[0009] Furthermore, the nose portion of the mask includes a third face and a fourth face that are relatively arranged and form an angle with each other, the connecting line of the third face and the fourth face corresponds to the midline of the face, and the bottom of the third face and the bottom of the fourth face are both connected to the inner side surface of the mask face portion; a flexible support member is provided near the top of the nose portion of the mask, the flexible support member is an elongated strip, the elongated flexible support member is arranged in a horizontal direction, and the center of the elongated flexible support member is located on the connecting line of the third face and the fourth face.

[0010] Furthermore, a body-sensing heating cloth is provided on the inner side of the nose portion of the mask.

[0011] Furthermore, a nose pad structure is provided on the nose portion of the mask, and the nose pad structure includes a fifth face and a sixth face that are arranged opposite to each other and form an angle with each other, the connection line of the fifth face and the sixth face corresponds to the midline of the face, and the bottom of the fifth face and the bottom of the sixth face are both connected to the top of the inner side surface of the nose portion of the mask; the nose pad structure can adapt and fit with the bridge of the nose on the face.

[0012] Furthermore, the base portion includes a seventh body and an eighth body that are arranged relative to each other and form an angle with each other. The connecting line of the seventh body and the eighth body corresponds to the midline of the face. The seventh body and the eighth body are both provided with folded angles, which correspond to the transition area between the face and the mandibular surface. The seventh body and the eighth body are both made of elastic fabric.

[0013] Furthermore, the filter assembly includes a meltblown cloth, a HEPA filter layer and an activated carbon layer which are stacked in sequence.

[0014] Furthermore, a plurality of teardrop-shaped through holes are provided on the end surface of the columnar housing facing away from the bottom cover. The plurality of teardrop-shaped through holes are evenly arranged around the center of the end surface to form a petal shape, and the plurality of teardrop-shaped through holes constitute an exhaust port.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] 1. This application is based on further analysis and research of existing technical problems, and it is recognized that the existing KN95 masks are not comfortable enough to wear, and the existing breathing valves directly exhaust the exhaled gas of the wearer, which is not hygienic enough. Therefore, this application provides a new type of protective mask. A breathing valve capable of filtering the exhaled gas of the user is provided on the mask face. The breathing valve includes a bottom cover installed on the mask and a valve body detachably connected to the bottom cover. The bottom cover is provided with exhaust holes and plug posts. The valve body includes a columnar housing. One end of the columnar housing is provided with a groove, and a socket tube adapted to be plugged and connected with the plug post is arranged in the groove. A ventilation hole is opened at the bottom of the groove. An installation space for installing a filter component is formed between the other end of the columnar housing and the groove. An exhaust port is arranged on the end face of the columnar housing facing away from the bottom cover. When in use, the exhaled gas of the user can enter the groove through the exhaust holes on the bottom cover, enter the filter component through the ventilation hole at the bottom of the groove and then be filtered and discharged. Therefore, the mask provided by this application can filter and discharge the exhaled gas of the wearer, which can not only meet the hygienic requirements of places with high hygienic requirements, but also protect the people outside who are not wearing masks while protecting oneself.

[0017] 2. The wearing ropes of the protective mask provided by this application are wound around the back of the user's head and hooked on the breathing valve. Compared with the traditional ear-hanging wearing method, this application is more comfortable to wear.

[0018] 3. The flank edges of the mask face of the mask in this application are in the shape of a fish tail. This fish-tail shape can better fit the human face compared with the traditional arc edge or straight edge. It not only has good wearing comfort, but also has good sealing performance and thus good protection effect.

[0019] 4. A flexible support member is provided at the top of the mask nose in this application. When wearing, the flexible support member can not only provide a supporting force but also deform to make the mask better adhere to the nose, improving the wearing tightness. And the reliable wearing and fixing of the mask are realized by the flexible support member fixed on the nose and the wearing ropes wound around the back of the head.

[0020] 5. A body-sensing heating cloth is provided on the inner side of the mask nose of the mask in this application, such as products using graphene technology and carbon fiber heating cloth on the market. When it comes into contact with the skin, it can heat up quickly and continuously, making the wearing comfort higher in winter.

[0021] 6. A nose pad structure is provided on the mask nose in this application. It can be adapted and fitted to the bridge of the face, assisting the mask nose to reliably seal the bridge of the face, and further reducing the probability of fogging of glasses caused by gas leakage from the nose of the mask during exhalation in winter.

[0022] 7. In the present application, a base portion is provided below the mask face portion of the mask. The base portion can adapt to cover the bottom of the mandible, and a folding angle is formed thereon. The folding angle corresponds to the transition region between the face and the mandibular surface. Moreover, the base portion is made of elastic cloth. Therefore, it can be adapted to faces of various contour sizes, not only improving the sealing performance of the mask but also ensuring the comfort of the user when wearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application. For example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / deletion / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional ratio relationships, etc. based on the technical concepts disclosed in the present application and the exemplary drawings.

[0024] Figure 1 FIG. 9 is a schematic diagram of the first three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0025] Figure 2 FIG. 13 is a schematic diagram of the second three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0026] Figure 3 FIG. 17 is a schematic diagram of the third three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0027] Figure 4 FIG. 21 is a schematic diagram of the fourth three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0028] Figure 5 FIG. 25 is a schematic diagram of the fifth three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0029] Figure 6 FIG. 29 is a schematic diagram of the sixth three-dimensional structure of the protective mask provided in an embodiment of the present application;

[0030] Figure 7 FIG. 33 is a schematic diagram of the structure of the breathing valve of the protective mask provided in an embodiment of the present application;

[0031] Figure 8 FIG. 37 is an exploded schematic diagram of the structure of the breathing valve of the protective mask provided in an embodiment of the present application, where the exhaust port at the end is not shown on the cylindrical housing.

[0032] DESCRIPTION OF THE REFERENCE NUMERALS:

[0033] 1. Mask face part; 11. Fish tail edge;

[0034] 2. Mask nose part; 21. Flexible support; 22. Nose pad structure;

[0035] 3. Bottom support part; 31. Fold angle;

[0036] 4. Breathing valve; 41. Bottom cover; 411. Exhaust hole; 42. Columnar outer shell; 43. Groove; 431. Ventilation hole; 44. Connecting and inserting tube; 45. Filter component installation space; 46. Exhaust port;

[0037] 5. Wearing rope. Detailed implementation mode

[0038] The following further details the present application through specific embodiments in conjunction with the accompanying drawings.

[0039] In the description of the present application: Unless otherwise specified, the meaning of "a plurality" is two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special significance in terms of technical connotations (for example, it should not be understood as emphasizing the importance level or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0040] The terms such as "upper", "lower", "left", "right", "top", "bottom", etc. cited in the present application are usually for the convenience of intuitively understanding with reference to the accompanying drawings, and are not an absolute limitation on the positional relationship in the actual product. Without departing from the technical concept disclosed in the present application, the change of these relative positional relationships should also be regarded as the scope of the expression of the present application.

[0041] Existing disposable medical protective masks do not fit tightly with the human face when worn, and cannot achieve effective protection. Although the existing KN95 masks greatly improve the wearing tightness and sealing performance, they will press on the ears when worn for a long time, reducing the wearing comfort of the masks. In addition, the existing KN95 masks also have the problem of being unable to ensure smooth breathing, and water vapor will be generated when worn in winter. Therefore, there are still many problems with existing masks.

[0042] The present application provides a new type of protective mask. See Figure 3, which mainly includes a mask body, a nose pad structure 22, a breathing valve 4, and a wearing rope 5. The breathing valve 4 is arranged on the mask body. A bottom support part 3 is arranged at the bottom of the mask body. The two wing edges of the mask body form fishtail edges 11. The wearing rope 5 is arranged on one side of the fishtail edge 11 and is hung on the breathing valve 4 on the other side after passing around the back of the head. This protective mask is different from the traditional ear-hanging wearing method. By winding the wearing rope 5 around the back of the head, it no longer presses on the ears, improving the wearing comfort. In addition, the protective mask provided in this application has high airtightness after wearing, can filter and discharge the gas exhaled by the user, and the nose pad structure 22 can reliably seal the bridge of the nose on the face, further reducing the probability of fogging of glasses caused by gas leakage from the nose part 2 of the mask during exhalation in winter. The structural composition of this protective mask will be described in detail below.

[0043] See Figure 1 , 2 , according to the fitting position of the mask on the human face, the protective mask provided in this application can be divided into: a face covering part 1, a nose covering part 2, a bottom support part 3, and a wearing rope 5. The nose covering part 2 is arranged above the face covering part 1, and the bottom support part 3 is arranged below the face covering part 1, where: the face covering part 1 is provided with a breathing valve 4 and fishtail edges 11 at the edge, the nose covering part 2 is provided with a body-sensing heating cloth and a nose pad structure 22, the bottom support part 3 is provided with a fold angle 31 adapted to the transition area between the face and the mandible and is made of elastic cloth. The structural composition of the face covering part 1, the nose covering part 2, and the bottom support part 3 will be described one by one below.

[0044] In this application, the face covering part 1 mainly includes a first face and a second face that are oppositely arranged and form an included angle with each other. The first face and the second face have the same structure. The connection line between the first face and the second face corresponds to the midline of the face. The breathing valve 4 is arranged on the outer side of the first face. See Figure 7 , 8 , the breathing valve 4 includes a bottom cover 41 installed on the first face and a valve body detachably connected to the bottom cover 41. The bottom cover 41 is provided with an exhaust hole 411 and a socket post. The valve body includes a columnar housing 42. One end of the columnar housing 42 is provided with a groove 43. A socket tube 44 adapted to be inserted and connected with the socket post is arranged in the groove 43. A ventilation hole 431 is opened at the bottom of the groove 43. An installation space for installing a filter component is formed between the other end of the columnar housing 42 and the groove 43. An exhaust port 46 is arranged on the end face of the columnar housing 42 facing away from the bottom cover 41.

[0045] In a specific embodiment, the filter component mainly includes a meltblown cloth, a HEPA filter layer, and an activated carbon layer that are sequentially stacked.

[0046] In a specific embodiment, see Figure 7, on the end face of the columnar housing 42 facing away from the bottom cover 41, a plurality of water droplet-shaped through holes are provided. The plurality of water droplet-shaped through holes are evenly arranged around the center of the end face to form a petal shape. The plurality of water droplet-shaped through holes constitute the exhaust port 46. The ventilation cross-sectional area of the exhaust port 46 should be as large as possible to ensure smooth exhaust. This petal-shaped exhaust port 46 can enhance the aesthetics of the mask.

[0047] In one embodiment, referring to Figure 1 , 2 , fish-tail edges 11 are provided at the flanking edges of the first face body and the second face body, that is, edges in the shape of a fish tail. The fish-tail edge 11 is composed of a first convex arc and a second convex arc that are smoothly transition-connected. The first convex arc is located above the second convex arc, and the radian of the first convex arc is larger than that of the second convex arc.

[0048] In one embodiment, the first face body and the second face body can be composed of a comfort layer and a filter layer arranged in a laminated manner, which not only improves the wearing comfort but also enables the mask to have a filtering and protective effect.

[0049] In one embodiment, in the present application, a first fixing point and a second fixing point are provided on the flanking edge of the second face body. The first fixing point and the second fixing point are arranged at an interval in the up-and-down direction. After one end of the wearing rope 5 is connected and fixed to the first fixing point, the wearing rope 5 bypasses the back of the wearer's head and is wound around the housing of the breathing valve 4, and then returns from the back of the wearer's head to the second fixing point and is connected and fixed to the second fixing point, as Figure 1 , 2 . Preferably, the wearing rope 5 is an elastic rope, and its length can be freely adjusted according to the head circumference without pinching the ears. Therefore, compared with the traditional ear-hanging wearing method, this wearing method improves the wearing comfort.

[0050] In one embodiment, a snap ring groove can be provided on the side wall of the columnar housing 42 of the breathing valve 4. The snap ring groove is a circular groove 43 arranged along the radial direction of the side wall of the columnar housing 42. The groove 43 can effectively catch the wearing rope 5 to prevent it from slipping off, ensuring the reliability and tightness of the wearing.

[0051] Referring to Figure 1, in this application, the nose part 2 of the mask mainly includes a third face and a fourth face that are oppositely arranged and form an angle with each other. The connecting line of the third face and the fourth face corresponds to the midline of the face. The structures of the third face and the fourth face are the same. The bottom of the third face and the bottom of the fourth face are both connected to the inner side of the mask face 1; at a position near the top of the nose part 2 of the mask, a flexible support 21 is provided. The flexible support 21 can be embedded in the mask layer structure for invisible fixation. The flexible support 21 is strip-shaped. The strip-shaped flexible support 21 is arranged horizontally, and the center of the strip-shaped flexible support 21 is located on the connecting line of the third face and the fourth face. When worn, the flexible support 21 can not only provide a supporting force but also deform to make the mask better adhere to the nose, improving the wearing tightness. And through the flexible support 21 fixed to support the nose and the wearing rope 5 wound around the back of the head, reliable wearing and fixation of the mask are realized.

[0052] In one embodiment, a body-sensing heating cloth is provided on the inner side of the nose part 2 of the mask, such as products using graphene technology and carbon fiber heating cloth on the market. When it comes into contact with the skin, it can heat up quickly and continuously, making the wearing comfort in winter higher. Such as products using graphene technology and carbon fiber heating cloth on the market. When it comes into contact with the skin, it can heat up quickly and continuously, making the wearing comfort in winter higher.

[0053] In one embodiment, refer to Figure 4 , 5 , a nose pad structure 22 is provided on the nose part 2 of the mask. The nose pad structure 22 includes a fifth face and a sixth face that are oppositely arranged and form an angle with each other. The connecting line of the fifth face and the sixth face corresponds to the midline of the face. The bottom of the fifth face and the bottom of the sixth face are both connected to the top of the inner side of the nose part 2 of the mask; the nose pad structure 22 can be adapted and fitted to the bridge of the nose part of the face. Therefore, the nose pad structure 22 can assist the nose part 2 of the mask to reliably seal the bridge of the nose on the face, further reducing the probability of fogging of glasses caused by gas leakage from the nose part 2 of the mask during exhalation in winter.

[0054] In this application, the bottom support part 3 can adapt to cover the bottom of the mandible. It mainly includes a seventh face and an eighth face that are oppositely arranged and form an angle with each other. The structures of the seventh face and the eighth face are the same. The connecting line of the seventh face and the eighth face corresponds to the midline of the face. Fold angles 31 are provided on both the seventh face and the eighth face. As Figure 6 , the fold angles 31 correspond to the transition area between the face and the mandibular surface. Both the seventh face and the eighth face are elastic cloth. Therefore, the structural design of the bottom support part 3 in this application can not only adapt to faces of various contour sizes but also improve the sealing performance of the mask, ensuring the comfort of the user when wearing.

[0055] Therefore, the protective mask provided by the present application is different from the traditional ear-hanging wearing method, no longer squeezing the ears, and improving the comfort of wearing the mask; moreover, the mask face part, mask nose part, nose support structure and bottom support part with fish-tail edges jointly enclose a three-dimensional closed space that fits closely and reliably with the human facial contour, which can not only keep breathing smooth, but also improve the protection effect, and the breathing valve can filter and discharge the exhaled gas of the user, making it safer and more hygienic, and can meet the wearing needs of places with high hygiene requirements; in addition, in the present application, the upper edge of the mask is reliably sealed by the mask nose part and the nose support structure, which can further reduce the probability of fogging of glasses caused by gas leakage from the nose of the mask during exhalation in winter.

[0056] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written out should also be considered to be within the scope described in this specification.

[0057] In the above text, the present application has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; but as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A protective mask, characterized in that, The mask comprises a mask face, a wearing rope, a mask nose connected above the mask face, and a bottom support connected below the mask face, wherein the bottom support can adapt to the bottom of the mandible of the mask; The mask surface portion includes a first surface body and a second surface body which are arranged opposite to each other and form an angle with each other, the connection line of the first surface body and the second surface body corresponds to the midline of the face, a breathing valve is arranged on the outer side surface of the first surface body, the breathing valve includes a bottom cover installed on the first surface body and a valve body detachably connected to the bottom cover, an exhaust hole and a connector column are arranged on the bottom cover, the valve body includes a columnar shell, one end of the columnar shell is provided with a groove, a connector tube for adapting and plugging with the connector column is arranged in the groove, a vent is provided at the bottom of the groove, an installation space for installing a filter assembly is formed between the other end of the columnar shell and the groove, and an exhaust port is arranged on the end surface of the columnar shell facing away from the bottom cover.

2. The protective mask according to claim 1, characterized in that, The side wing edge of the second face body is provided with a first fixed point and a second fixed point, the first fixed point and the second fixed point are arranged at an interval up and down, after one end of the wearing rope is connected and fixed to the first fixed point, the wearing rope is passed around the back of the wearer's head and is wound around the outer shell of the breathing valve, and then is passed back from the back of the wearer's head to the second fixed point and is connected and fixed to the second fixed point; The wearing rope is an elastic rope.

3. The protective mask according to claim 1, characterized in that, The side edge of the first face body away from the second face body is in a fishtail shape, and the side edge of the second face body away from the first face body is in a fishtail shape, and the fishtail shape is composed of a first convex arc and a second convex arc connected by a smooth transition.

4. The protective mask according to claim 1, characterized in that, The nose portion of the mask includes a third face and a fourth face that are relatively arranged and angled with each other, the connecting line of the third face and the fourth face corresponds to the midline of the face, and the bottom of the third face and the bottom of the fourth face are both connected to the inner side surface of the mask face portion; a flexible support member is arranged at a position close to the top of the nose portion of the mask, and the flexible support member is in the shape of a long strip. The long strip of flexible support member is arranged in the horizontal direction, and the center of the long strip of flexible support member is located on the connecting line of the third face and the fourth face.

5. The protective mask according to claim 1 or 4, characterized in that, A body-sensing heating cloth is arranged on the inner side surface of the nose portion of the mask.

6. The protective mask according to claim 5, characterized in that, A nose pad structure is arranged on the nose portion of the mask, and the nose pad structure includes a fifth face and a sixth face that are arranged opposite to each other and form an angle with each other, the connection line of the fifth face and the sixth face corresponds to the midline of the face, and the bottom of the fifth face and the bottom of the sixth face are both connected to the top of the inner side surface of the nose portion of the mask; the nose pad structure can adapt and fit with the bridge of the nose on the face.

7. The protective mask according to claim 1, characterized in that, The base support portion includes a seventh body and an eighth body which are arranged opposite to each other and form an angle with each other. The connecting line of the seventh body and the eighth body corresponds to the midline of the face. The seventh body and the eighth body are both provided with folded angles, and the folded angles correspond to the transition area between the face and the mandibular surface. The seventh body and the eighth body are both made of elastic fabric.

8. The protective mask according to claim 1, characterized in that The filter assembly includes a meltblown cloth, a HEPA filter layer and an activated carbon layer which are stacked in sequence.

9. The protective mask according to claim 1, characterized in that A plurality of water-drop-shaped through holes are formed in the end face of the columnar housing facing away from the bottom cover. The plurality of water-drop-shaped through holes are evenly arranged around the center of the end face to form a petal shape, and the plurality of water-drop-shaped through holes constitute the exhaust port.

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