Airflow atomizer

Abstract

The utility model provides an airflow atomizer which comprises a cup body and a cup core, an air inlet nozzle is arranged at the bottom of the cup body in a communicated mode, an air outlet nozzle is arranged on the cup body in a communicated mode, the upper end of the cup core is connected with the cup body through a connecting portion, and the lower portion of the cup core extends into the cup body. The air inlet nozzle extends into the cup body, the bottom of the cup core is provided with an impact part and taper pipes arranged at intervals, and the taper pipes face upwards and are aligned with the impact part; a plurality of grooves are formed in the inner wall of the taper pipe, the grooves and the outer wall of the air inlet nozzle form a liquid suction cavity channel, and the two ends of the liquid suction cavity channel are communicated with the inner bottom of the cup body and the upper end of the air inlet nozzle respectively. The cup core is sleeved with a filter cover, an opening of the filter cover faces downwards, a plurality of filter holes are formed in the filter cover, and the filter cover is in clearance fit with the cup body; the impact part is positioned in the filter cover; one end of the connecting pipe is communicated with the air inlet nozzle, the other end of the connecting pipe is communicated with the atomizer, and a valve is arranged on the connecting pipe; the problems that a traditional atomizer is large in atomization residue amount, large in mist bead particle size, single in atomization switch and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of atomizers, in particular to an airflow atomizer. Background Art

[0002] Airflow nebulizer, also known as pneumatic nozzle, uses compressed air to make the liquid meet at the air nozzle to split the liquid film and atomize. There are many varieties of existing airflow nebulizer products, but there are still some problems in clinical use, such as a lot of residual solution in the nebulizer, the diameter of the atomized fog particles is too large, and when the nebulizer is connected to the nebulizer, the main switch is on the nebulizer, and the nebulizer's atomization start and stop functions all rely on the start and stop of the nebulizer, without secondary confirmation or secondary safety devices. Utility Model Content

[0003] The utility model aims to provide an airflow atomizer, which solves the problems of traditional atomizers, such as much atomization residue, large diameter of fog beads and single atomization switch.

[0004] The embodiment of the utility model is realized by the following technical scheme: an air flow atomizer, comprising a cup body and a cup core, wherein the bottom of the cup body is connected with an air inlet nozzle, the upper end of the cup body is connected with an air outlet nozzle, the upper end of the cup core is provided with a connecting part, the connecting part is interference fit with the cup mouth of the cup body, the lower part of the cup core extends into the cup body and leaves a gap with the cup body;

[0005] The air inlet nozzle extends into the cup body, the bottom of the cup core is provided with an impact part, and the bottom of the cup core is also coaxially provided with tapered tubes at intervals, the tapered tubes face upward and are aligned with the impact part;

[0006] The lower end of the conical tube is engaged with the air inlet nozzle, the inner wall of the conical tube is provided with a plurality of grooves, the grooves and the outer wall of the air inlet nozzle form a liquid suction cavity, and the two ends of the liquid suction cavity are respectively connected to the inner bottom of the cup body and the upper end of the air inlet nozzle;

[0007] A filter cover is sleeved on the cup core, the filter cover opens downward, a plurality of filter holes are arranged on the filter cover, and the filter cover is gap-matched with the cup body.

[0008] Furthermore, the impact part is located inside the filter cover.

[0009] Furthermore, it also includes a connecting pipe, one end of which is connected to the air inlet nozzle, and the other end of which is connected to the atomizer, and a valve is provided on the connecting pipe.

[0010] Furthermore, a cavity is provided inside the cup core, an air inlet is provided at the lower end of the cavity, and the air inlet is connected to the bottom of the cup core;

[0011] The top of the cavity is provided with an exhaust port, the top of the cup core is rotatably provided with a valve plate, the area of ​​the valve plate is larger than the exhaust port, and the exhaust port is located on the rotation path of the valve plate.

[0012] Furthermore, the exhaust port is fan-shaped, the valve plate is also fan-shaped, and a scale is provided on the valve plate along the fan-shaped edge.

[0013] Furthermore, a fan-shaped baffle is horizontally arranged on the cup core, the fan-shaped baffle is located at one end of the cup core close to the air outlet and above the filter cover, and the fan-shaped baffle is in clearance with the cup body;

[0014] Both ends of the fan-shaped baffle are vertically provided with vertical baffles, one end of the two vertical baffles is connected to the cup core, and the other end of the two vertical baffles is slidably abutted against the cup body; a gap is left between the upper end of the vertical baffle and the connecting part.

[0015] Furthermore, a convex first step portion is provided on the side wall of the connecting portion; a concave second step portion is provided on the cup mouth of the cup body, and the first step portion is embedded in the second step portion.

[0016] Furthermore, a plurality of buckles are provided in an annular array on the side wall of the first step portion, the front end of the buckle is wedge-shaped, and a protrusion is provided on the top of the buckle;

[0017] A plurality of L-shaped notches are arranged in a circular array on the inner wall of the second step portion, a notch is arranged on the top of the horizontal portion of the L-shaped notch, and when the buckle is located at the horizontal portion of the L-shaped notch, the protrusion is placed in the notch.

[0018] Furthermore, a cup handle is arranged on the outer wall of the cup body, and anti-slip grooves are arranged on the cup handle.

[0019] Furthermore, the air outlet is connected to a mouthpiece or a mask.

[0020] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0021] 1. After the liquid medicine collides with the impact part, mist beads are formed. The mist beads fly and pass through the filter cover along with the airflow. The mist beads with larger diameters will be blocked by the filter holes on the filter cover. After enough liquid is gathered, they flow to the bottom of the cup body under the action of gravity so as to be atomized again, which effectively reduces the amount of liquid residue on the side wall of the cup body and avoids the situation where the mist particles with larger diameters flow to the cup mouth and are absorbed by the human body.

[0022] 2. One end of the connecting tube is connected to the air inlet nozzle, and the other end of the connecting tube is connected to the atomizer. A valve is provided on the connecting tube. The valve serves as a secondary safety device of the atomizer product. When the cup body is connected to the atomizer through the connecting tube and the atomizer is started, the buckle can be opened only after confirming that the atomizer works normally, the gas rate is stable and free of impurities, to ensure that the airflow source of the atomizer is stable and reliable.

[0023] 3. A raised driving block is provided on the valve plate to facilitate driving the valve plate to rotate, and then the gas outlet volume of the exhaust port is controlled by rotating the valve plate. The opening and closing amount can be accurately controlled through the scale on the valve plate, and then the gas outlet volume can be controlled. When the high-pressure gas carries the liquid medicine to be atomized, the flow rate of the fog bead airflow is controlled by the flow rate of the air outlet nozzle. When it is necessary to increase the amount of fog beads flowing out of the air outlet nozzle, the valve plate can be controlled to open, and the amount of gas outlet increases, so that the high-pressure gas can be discharged quickly, the internal flow rate increases, and more fog beads can be generated. Because part of the high-pressure gas enters the cavity of the cup core from the air inlet hole and is then discharged from the exhaust port, the concentration of the fog beads flowing out of the air outlet nozzle can be increased when a large number of fog beads are discharged, thereby realizing the control of the fog bead flow rate. On the contrary, the smaller the exhaust port, the less smooth the airflow is, and the fewer fog beads are generated, and the less amount of fog beads flowing out of the air outlet nozzle is; and the fog beads discharged from the exhaust port can be ignored.

[0024] 4. The fan-shaped baffle and the side panels on both sides are used to prevent the mist beads passing through the filter cover from gathering into large mist beads and then being discharged from the air outlet. Then, the mist beads and gas first move to the side away from the air outlet in the cup body, then pass through the top of the two side panels, and finally be discharged from the air outlet. In this process, mist beads with larger diameters can be retained in the cup body, especially the part of the cup body close to the air outlet. Under the action of gravity, the mist beads finally gather at the bottom of the cup body again and are atomized again.

[0025] 5. When assembling the cup core and the cup body, move the buckle from the vertical part of the L-shaped notch down to the horizontal part, and then rotate the two relative to each other, so that the buckle enters the horizontal part of the L-shaped notch, and then the two are connected and fixed. At the same time, the front end of the buckle is wedge-shaped to facilitate the buckle to enter the horizontal part, and the combination of the protrusion and the recess can make the connection between the two more stable. The protrusion is more hemispherical or arc-shaped. The cup body and cup core are plastic parts. When assembling, you can use a little force to make the protrusion enter or move out of the recess. For the target group that needs atomization, children are hyperactive and playful, which can easily cause the atomizer to shake, deform, and waste medicine. After locking through this locking function, it can prevent the cup core and cup body from separating due to unexpected operations such as accidental collisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of an airflow atomizer provided by the utility model;

[0028] Figure 2 A schematic diagram of the internal structure of an airflow atomizer provided by the utility model;

[0029] Figure 3 for Figure 2 A magnified schematic diagram of the structure at C in the middle;

[0030] Figure 4 A schematic diagram of the explosion structure of an airflow atomizer provided by the utility model;

[0031] Figure 5 for Figure 4 A magnified schematic diagram of the structure at center A;

[0032] Figure 6 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0033] Icons: 1. Cup body, 11. Air inlet nozzle, 12. Air outlet nozzle, 13. Second step portion, 14. L-shaped notch, 141. Horizontal part, 142. Notch, 143. Vertical part, 15. Cup handle, 151. Anti-slip pattern, 2. Cup core, 21. Impact part, 22. Conical tube, 221. Groove, 222. Liquid suction channel, 23. Cavity, 24. Air inlet hole, 25. Fan-shaped baffle, 26. Vertical baffle, 3. Connecting part, 31. Exhaust port, 32. Valve plate, 321. Scale, 33. First step portion, 34. Buckle, 341. Bump, 4. Filter cover, 41. Filter hole, 5. Connecting pipe, 51. Valve. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 6 As shown, this embodiment provides an air flow atomizer, including a cup body 1, an air inlet nozzle 11 is connected to the bottom of the cup body 1, and air flow is pumped into the air inlet nozzle 11, an air outlet nozzle 12 is connected to the cup body 1, and a connecting part 3 is arranged on the upper part of the cup core 2. The connecting part 3 and the cup mouth of the cup body 1 have an interference fit, and then the main air outlet nozzle 12 serves as an outlet for high-pressure gas. At the same time, the lower part of the cup core 2 extends into the cup body 1 and leaves a gap with the cup body 1.

[0037] More specifically, Figure 1-3 As shown, the air inlet nozzle 11 extends into the cup body 1, a protruding impact portion 21 is provided at the bottom of the cup core 2, and a conical tube 22 is coaxially arranged at intervals at the bottom of the cup core 2. The conical tube 22 faces upward and is aligned with the impact portion 21. After the airflow comes out from the upper end of the conical tube 22, the cross-section of the inner cavity at the upper end of the conical tube 22 becomes smaller, thereby increasing the flow rate of the gas;

[0038] The lower end of the conical tube 22 is engaged with the air inlet nozzle 11, and the inner wall of the conical tube 22 is provided with a plurality of grooves 221, and the grooves 221 and the outer wall of the air inlet nozzle form a liquid suction cavity 222;

[0039] During specific implementation, before use, first connect the air inlet nozzle 11 to the air pump, then pour the medicine into the cup body 1, then insert the cup core 2 into the cup body 1, and connect the connecting part 3 to the cup body 1. At this time, the air inlet nozzle 11 is inserted into the conical tube 22, and then the air pump is turned on to pump in gas. It should be noted that the outlet at the top of the conical tube 22 is very narrow. When the gas flows from the inlet nozzle to the conical tube 22 and then sprays out from the upper end of the conical tube 22, the gas flow rate is very high. According to Bernoulli's principle, the groove 221 and the outer wall of the air nozzle form a liquid suction cavity 222 to generate negative pressure, thereby transporting the medicine upward. Since the speed of the medicine is much lower than the speed of the airflow, the two fluids have a very high relative speed. The liquid film is drawn into a filament and then split into fine droplets. At the same time, the airflow carries the medicine and hits the impact part 21 at high speed, thereby forming mist beads. The mist beads scatter in the horizontal direction and are discharged from the air outlet nozzle 12 with the airflow, and finally are inhaled by the patient.

[0040] More specifically, Figure 1-4As shown, a filter cover 4 is sleeved on the cup core 2, the filter cover 4 opens downward, and a plurality of filter holes 41 are provided on the filter cover 4, and the filter cover 4 is in clearance with the cup body 1; at the same time, the impact part 21 is located in the filter cover 4. In specific implementation, after the liquid medicine and the impact part 21 collide, mist beads are formed, and the mist beads fly and pass through the filter cover 4 along with the airflow. The mist beads with larger diameters will be blocked by the filter holes on the filter cover 4. After sufficient liquid is gathered, they flow to the bottom of the cup body 1 under the action of gravity so as to be atomized again, which effectively reduces the amount of liquid residue on the side wall of the cup body 1 and avoids the situation where the mist particles with larger diameter flow to the cup mouth and are absorbed by the human body. Relevant studies have shown that mist particles ≤5μm can enter the alveoli only after being inhaled by the human body. Therefore, this structure can effectively increase the proportion of mist particles ≤5μm in the nebulizer and better achieve the atomization effect.

[0041] like Figure 1-2 As shown, it also includes a connecting tube 5, one end of which is connected to the air inlet nozzle 11, and the other end of which is connected to the atomizer, and a valve 51 is provided on the connecting tube 5. In specific implementation, the valve 511 serves as a secondary safety device of the atomizer product. When the cup body 1 is connected to the atomizer through the connecting tube 5 and the atomizer is started, the buckle 34 can be opened only after confirming that the atomizer works normally and the gas rate is stable and free of impurities, so as to ensure that the airflow source of the atomizer is stable and reliable.

[0042] More specifically, an air filter can be installed between the connecting tube 5 and the air inlet nozzle 11. This air filter can filter the air compressed by the air compressor in the nebulizer, thereby preventing impurities, dust and other fine pollutants in the air from entering the cup body 1 of the nebulizer cup through the connecting tube 5 and then attaching to the mist particles in the air, thereby reducing the risk of being inhaled into the body by the patient.

[0043] like Figure 2 As shown, a cavity 23 is provided inside the cup core 2, an air inlet 24 is provided at the lower end of the cavity 23, and the air inlet 24 is connected to the bottom of the cup core 2; an exhaust port 31 is provided at the top of the cavity 23, and a valve plate 32 is rotatably provided at the top of the cup core 2, the area of ​​the valve plate 32 is larger than the exhaust port 31, and the exhaust port 31 is located on the rotation path of the valve plate 32.

[0044] More specifically, the exhaust port 31 is fan-shaped, the valve plate 32 is also fan-shaped, and a scale 321 is provided along the fan-shaped edge of the valve plate 32 .

[0045] In a specific implementation, a protruding driving block is provided on the valve plate 32, which is convenient for driving the valve plate 32 to rotate, and then the gas outlet 31 is controlled by rotating the valve plate 32. The opening and closing amount can be accurately controlled by the scale 321 on the valve plate 32, and then the gas outlet amount can be controlled. When the high-pressure gas carries the liquid medicine to be atomized, the flow rate of the mist bead airflow is controlled by the flow rate of the air outlet nozzle 12, and then when it is necessary to increase the amount of mist beads flowing out of the air outlet nozzle 12, the valve plate 32 can be controlled to open, and the amount of gas outlet is increased, so that the high-pressure gas The gas can be discharged quickly, and the internal flow rate increases, so that more mist beads can be produced. Because a part of the high-pressure gas enters the cavity 23 of the cup core 2 from the air inlet 24 and is then discharged from the exhaust port 31, the large amount of mist beads produced can increase the concentration of the mist beads flowing out of the air outlet nozzle 12 when they are discharged, thereby realizing the control of the mist bead flow rate. On the contrary, the smaller the exhaust port 31 is, the less smooth the air flow is, and the fewer mist beads are produced, and the amount of mist beads flowing out of the air outlet nozzle 12 is also small; and the mist beads discharged from the exhaust port 31 can be ignored.

[0046] like Figure 2 and 4 As shown, a fan-shaped baffle 25 is horizontally arranged on the cup core 2, and the fan-shaped baffle 25 is located at one end of the cup core 2 close to the air outlet nozzle 12 and above the filter cover 4, and the fan-shaped baffle 25 is in clearance with the cup body 1;

[0047] Vertical baffles 26 are vertically arranged at both ends of the fan-shaped baffle 25 , one end of the two vertical baffles 26 is connected to the cup core 2 , and the other end of the two vertical baffles 26 is slidably abutted against the cup body 1 ; a gap is left between the upper end of the vertical baffle 26 and the connecting part 3 .

[0048] In specific implementation, the fan-shaped baffle 25 and the side panels on both sides are used to prevent the mist beads passing through the filter cover 4 from gathering into large mist beads and then being discharged from the air outlet nozzle 12. Then, the mist beads and gas first move in the cup body 1 to the side away from the air outlet nozzle 12, and then pass through the top of the two side panels, and finally be discharged from the air outlet nozzle 12. In this process, mist beads with larger diameters can be retained in the cup body 1, especially the part of the cup body 1 close to the air outlet nozzle 12. Under the action of gravity, the mist beads finally gather at the bottom of the cup body 1 again and are atomized again.

[0049] like Figure 1-6 As shown, a convex first step portion 33 is provided on the side wall of the connecting portion 3 ; a concave second step portion 13 is provided on the cup mouth of the cup body 1 , and the first step portion 33 is embedded with the second step portion 13 .

[0050] A plurality of buckles 34 are arranged in an annular array on the side wall of the first step portion 33. The front end of the buckle 34 is wedge-shaped, and a protrusion 341 is arranged on the top of the buckle 34.

[0051] A plurality of L-shaped notches 14 are arranged in a circular array on the inner wall of the second step portion 13 . A notch 142 is arranged at the top of the horizontal portion 141 of the L-shaped notch 14 . When the buckle 34 is located at the horizontal portion 141 of the L-shaped notch 14 , the protrusion 341 is placed in the notch 142 .

[0052] In specific implementation, when assembling the cup core 2 and the cup body 1, the buckle 34 is moved downward from the vertical part 143 of the L-shaped notch 14 to the horizontal part 141, and then the two are rotated relative to each other, so that the buckle 34 enters the horizontal part 141 of the L-shaped notch 14, and the two are connected and fixed to each other. At the same time, the front end of the buckle 34 is wedge-shaped to facilitate the buckle 34 to enter the horizontal part 141, and the protrusion 341 and the recess 142 cooperate to make the connection between the two more stable. The protrusion 341 is more hemispherical or arc-shaped. The cup body 1 and the cup core 2 are plastic parts. During assembly, the protrusion 341 can be moved into or out of the recess 142 with a little force.

[0053] For the target group that needs atomization, children are hyperactive and playful, which can easily cause the atomizer to shake, deform, and waste medicine. After locking through this locking function, it can prevent the cup core 2 and the cup body 1 from separating due to unexpected operations such as accidental collisions.

[0054] More specifically, Figure 1 As shown, the outer wall of the cup body 1 is provided with a cup handle 15, and the cup handle 15 is provided with an anti-slip pattern 151, which is convenient for holding and prevents slipping. At the same time, the air outlet 12 is connected with a mouthpiece or a mask, and different tools can be used to absorb the mist beads according to actual needs.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air flow atomizer, comprising a cup body (1) and a cup core (2), wherein the bottom of the cup body (1) is connected to an air inlet nozzle (11), the top of the cup body (1) is connected to an air outlet nozzle (12), the upper end of the cup core (2) is provided with a connecting portion (3), the connecting portion (3) is interference fit with the cup mouth of the cup body (1), the lower part of the cup core (2) extends into the cup body (1) and leaves a gap with the cup body (1); characterized in that: The air inlet nozzle (11) extends into the cup body (1), the bottom of the cup core (2) is provided with an impact portion (21), and the bottom of the cup core (2) is also coaxially provided with a conical tube (22) at intervals, the conical tube (22) faces upward and is aligned with the impact portion (21); The lower end of the conical tube (22) is engaged with the air inlet nozzle (11), the inner wall of the conical tube (22) is provided with a plurality of grooves (221), the grooves (221) and the outer wall of the air inlet nozzle (11) form a liquid suction cavity (222), and the two ends of the liquid suction cavity (222) are respectively connected to the inner bottom of the cup body (1) and the upper end of the air inlet nozzle (11); A filter cover (4) is sleeved on the cup core (2), the filter cover (4) is opened downward, a plurality of filter holes (41) are provided on the filter cover (4), and the filter cover (4) is clearance-matched with the cup body (1).

2. An air flow atomizer according to claim 1, characterized in that: The impact portion (21) is located inside the filter cover (4).

3. The air flow atomizer according to claim 1, characterized in that: It also comprises a connecting pipe (5), one end of which is connected to the air inlet nozzle (11), and the other end of which is connected to the atomizer, and a valve (51) is provided on the connecting pipe (5).

4. An airflow atomizer according to any one of claims 1 to 3, characterized in that: A cavity (23) is provided inside the cup core (2), an air inlet (24) is provided at the lower end of the cavity (23), and the air inlet (24) is communicated with the bottom of the cup core (2); The top of the cavity (23) is provided with an exhaust port (31), the top of the cup core (2) is rotatably provided with a valve plate (32), the area of ​​the valve plate (32) is larger than the exhaust port (31), and the exhaust port (31) is located on the rotation path of the valve plate (32).

5. An air flow atomizer according to claim 4, characterized in that: The exhaust port (31) is fan-shaped, the valve plate (32) is also fan-shaped, and a scale (321) is provided along the fan-shaped edge of the valve plate (32).

6. An air flow atomizer according to claim 5, characterized in that: A fan-shaped baffle (25) is horizontally arranged on the cup core (2), the fan-shaped baffle (25) is located at one end of the cup core (2) close to the air outlet nozzle (12) and above the filter cover (4), and the fan-shaped baffle (25) is clearance-matched with the cup body (1); Both ends of the fan-shaped baffle (25) are vertically provided with vertical baffles (26); one end of the two vertical baffles (26) is connected to the cup core (2), and the other end of the two vertical baffles (26) is slidably abutted against the cup body (1); a gap is left between the upper end of the vertical baffle (26) and the connecting portion (3).

7. An air flow atomizer according to claim 6, characterized in that: A convex first step portion (33) is provided on the side wall of the connecting portion (3); a concave second step portion (13) is provided on the cup mouth of the cup body (1), and the first step portion (33) is engaged with the second step portion (13).

8. An air flow atomizer according to claim 7, characterized in that: A plurality of buckles (34) are arranged in an annular array on the side wall of the first stepped portion (33); the front end of the buckle (34) is wedge-shaped, and a protrusion (341) is arranged on the top of the buckle (34); A plurality of L-shaped notches (14) are arranged in a circular array on the inner wall of the second step portion (13); a notch (142) is arranged at the top of the horizontal portion (141) of the L-shaped notch (14); and when the buckle (34) is located at the horizontal portion (141) of the L-shaped notch (14), the protrusion (341) is placed in the notch (142).

9. An airflow atomizer according to claim 8, characterized in that: The outer wall of the cup body (1) is provided with a cup handle (15), and the cup handle (15) is provided with anti-slip patterns (151).

10. An air flow atomizer according to claim 9, characterized in that: The air outlet nozzle (12) is connected to a mouthpiece or a mask.

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