Powder metering wheel, powder delivery mechanism and powder inhaler

Abstract

The invention discloses a powder metering wheel, a powder delivery mechanism and a powder inhaler, the powder metering wheel is applied to the powder inhaler and comprises a first arc section and a second arc section which are spaced from each other in the circumferential direction of the powder metering wheel, the first arc section is provided with a first arc surface, and the first arc surface is provided with a dosage cup; the first arc section is configured to be elastically deformable in the radial direction of the powder metering wheel. Through the arrangement, the diameter of the first arc section is adjustable, interference fit or tight fit between the first arc section of the powder metering wheel and a powder inhaler can be conveniently achieved, then it is guaranteed that a dosage cup on the first arc surface can be well sealed in the powder delivery process, and powder in the dosage cup is prevented from leaking in the powder delivery process; the problem that powder leaks in the powder delivery process of a powder delivery mechanism of a powder inhaler in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of inhalation device technology, and in particular to a powder metering wheel, a powder delivery mechanism, and a powder inhaler. Background Technology

[0002] A powder inhaler generally includes a housing assembly and various functional mechanisms. The functional mechanisms generally include a powder metering component. Before the user inhales, the powder in the powder container needs to be delivered to the powder metering component and then to the inhalation channel position so that the powdered drug preparation can be dispensed by airflow inhalation and the powder is inhaled from the powder metering component into the mouthpiece.

[0003] However, in the prior art, the powder delivery mechanism of powder inhalers is prone to powder leakage during the powder delivery process. Summary of the Invention

[0004] This application mainly provides a powder metering wheel, a powder delivery mechanism, and a powder inhaler to solve the problem of powder leakage that occurs during the powder delivery process in the powder delivery mechanism of existing powder inhalers.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a powder metering wheel for use in a powder inhaler, comprising a first arc segment and a second arc segment spaced apart from each other along the circumference of the powder metering wheel; the first arc segment has a first arc surface, and a dosing cup is provided on the first arc surface;

[0006] The first arc segment is configured to be elastically deformable in the radial direction of the powder metering wheel.

[0007] The powder metering wheel has a bearing ring at its center, which is spaced apart from the first arc segment and connected by a support rib.

[0008] Along the circumference of the powder metering wheel, the first arc segment includes a first sub-arc segment and a second sub-arc segment located on both sides of the support rib. The first sub-arc segment and the second sub-arc segment are elastically deformable to change the curvature of the first arc surface.

[0009] The first arc segment further includes a third sub-arc segment connecting the first sub-arc segment and the second sub-arc segment; the first sub-arc segment and the second sub-arc segment have the same arc length.

[0010] The arc length of the third sub-arc segment is 1 / 6 to 1 / 2 of the arc length of the first arc segment.

[0011] The arc length of the third sub-arc segment is 1 / 4 to 1 / 3 of the arc length of the first arc segment.

[0012] Wherein, the number of the supporting ribs is one, and in the circumferential direction of the powder metering wheel, the two opposite outer surfaces of the supporting ribs are respectively the first outer surface and the second outer surface, and the portion of the first arc segment corresponding to the part between the first outer surface and the second outer surface is the third sub-arc segment; or

[0013] The number of support ribs is multiple. In the circumferential direction of the powder metering wheel, the two outermost support ribs are the first support rib and the second support rib, respectively. The surface of the first support rib facing away from the second support rib is the third outer surface, and the surface of the second support rib facing away from the first support rib is the fourth outer surface. The part of the first arc segment corresponding to the third outer surface and the fourth outer surface is the third sub-arc segment.

[0014] The supporting rib is elastic along the radial direction of the powder metering wheel, allowing the first arc segment to move radially along the powder metering wheel.

[0015] The bearing ring has a first end and a second end that are axially opposite to each other along the powder metering wheel, and the first end has a first clamping spring arm.

[0016] The second arc segment has a second arc surface;

[0017] When both the first and second arc segments are in a non-deformed state, the diameter of the first arc surface is greater than the diameter of the second arc surface; the difference between the diameter of the first arc surface and the diameter of the second arc surface is greater than or equal to 0.4 mm and less than or equal to 5 mm.

[0018] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a powder delivery mechanism for use in a powder inhaler, comprising:

[0019] A powder container has a storage cavity, a first cylindrical groove, and a suction channel; the storage cavity is used to store powder, and the bottom end of the storage cavity has a powder outlet; the first cylindrical groove is located at the bottom end of the storage cavity and communicates with the powder outlet; the suction channel communicates with the first cylindrical groove.

[0020] The powder metering wheel described above is disposed in the first cylindrical groove and is capable of reciprocating between the third position and the fourth position; when the powder metering wheel is configured in the third position, the dosing cup is correspondingly disposed with the powder outlet; when the powder metering wheel is configured in the fourth position, the dosing cup is correspondingly disposed with the inlet of the inhalation channel.

[0021] When the first arc segment is in a non-deformed state, the diameter of the first arc surface is greater than or equal to the diameter of the inner arc surface of the first cylindrical groove, so that the first arc surface and the inner arc surface of the first cylindrical groove are interference fit or tightly fitted.

[0022] The first cylindrical groove contains a second cylinder, and the powder metering wheel is rotatably sleeved on the second cylinder.

[0023] The first clamping spring arm cooperates with the second cylinder to provide clamping force so that the inner arc surface of the first cylindrical groove fits against the first arc surface.

[0024] When the second arc segment is in a non-deformed state, the diameter of the second arc surface is smaller than the diameter of the inner arc surface of the first cylindrical groove.

[0025] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a powder inhaler, comprising:

[0026] The powder delivery mechanism as described above;

[0027] A dosage protection plate, rotatably connected to the powder container, includes an interconnected annular body and a shielding part; the shielding part is used to shield or not shield the dosage cup when the powder metering wheel is in the fourth position.

[0028] A housing assembly having a suction nozzle; the powder delivery mechanism and the dosage protection plate are disposed within the housing assembly, and the suction nozzle communicates with the inhalation channel;

[0029] The outer cover is rotatably connected to the housing assembly;

[0030] The outer cover is rotatable between a first position and a second position; when the outer cover is configured in the first position, the outer cover covers the suction nozzle; when the outer cover is configured in the second position, the suction nozzle is exposed.

[0031] The beneficial effects of this application are as follows: Unlike existing technologies, this application discloses a powder metering wheel, a powder delivery mechanism, and a powder inhaler. The powder metering wheel is applied to the powder inhaler and includes a first arc segment and a second arc segment spaced apart from each other along its circumference. The first arc segment has a first arc surface, on which a dosing cup is disposed. The first arc segment is configured to be elastically deformable in the radial direction of the powder metering wheel. This configuration allows the diameter of the first arc segment to be adjustable, facilitating an interference fit or tight fit between the first arc segment of the powder metering wheel and the powder inhaler. This ensures that the dosing cup on the first arc surface can be well sealed during powder delivery, preventing powder leakage from the dosing cup and solving the powder leakage problem that occurs in existing powder delivery mechanisms of powder inhalers during powder delivery. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0033] Figure 1 This is a schematic diagram of the structure of a powder inhaler provided in an embodiment of this application in the unopened state;

[0034] Figure 2 yes Figure 1 A schematic diagram of the provided powder inhaler in an open-top state;

[0035] Figure 3 yes Figure 1 A schematic diagram of the provided powder inhaler in another open-cap state;

[0036] Figure 4 yes Figure 3 A schematic diagram of the powder inhaler from another angle;

[0037] Figure 5A yes Figure 1 A schematic diagram of the outer cover of the provided powder inhaler at an angle;

[0038] Figure 5B yes Figure 5A A structural diagram of the outer cover from another angle;

[0039] Figure 6A yes Figure 1 A schematic diagram of the powder inhaler at an angle after removing the outer cover;

[0040] Figure 6B yes Figure 1 A schematic diagram of the powder inhaler from another angle after removing the outer cover;

[0041] Figure 7A yes Figure 2 A schematic diagram of the powder inhaler from another angle;

[0042] Figure 7B yes Figure 7A A partially enlarged schematic diagram of the provided powder inhaler;

[0043] Figure 8A yes Figure 1 A schematic diagram of the powder inhaler after removing the outer cover;

[0044] Figure 8B yes Figure 8A A partially enlarged schematic diagram of the provided powder inhaler;

[0045] Figure 9A yes Figure 1 A cross-sectional schematic diagram of the provided powder inhaler in one state after the outer cover has been removed;

[0046] Figure 9B yes Figure 1 A cross-sectional schematic diagram of the provided powder inhaler in another state after the outer cover has been removed;

[0047] Figure 9C yes Figure 1 A schematic diagram of a cross-section of the powder inhaler at another angle in one state after the outer cover has been removed;

[0048] Figure 9D yes Figure 1 A schematic diagram of a cross-section of the powder inhaler at another angle in another state after the outer cover has been removed;

[0049] Figure 9E yes Figure 9C A magnified view of a portion of region A;

[0050] Figure 9F yes Figure 9D A magnified view of a portion of region A;

[0051] Figure 9G yes Figure 9C A magnified view of a portion of region B;

[0052] Figure 9H yes Figure 1 A schematic diagram of the L-shaped airflow channel of the provided powder inhaler;

[0053] Figure 10A yes Figure 1A schematic diagram of the drive cam of the provided powder inhaler at an angle;

[0054] Figure 10B yes Figure 10A A schematic diagram of the drive cam at another angle is provided.

[0055] Figure 10C yes Figure 10A A schematic diagram of the drive cam at another angle is provided;

[0056] Figure 11 yes Figure 1 A schematic diagram of the airbag inhaler provided;

[0057] Figure 12A yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler when it is in the third position in the powder container;

[0058] Figure 12B yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler when it is in the fourth position in the powder container;

[0059] Figure 13A yes Figure 1 A schematic diagram of the powder container of the provided powder inhaler at an angle;

[0060] Figure 13B yes Figure 13A A schematic diagram of the powder container from another angle;

[0061] Figure 14A yes Figure 1 A schematic diagram of the structure of the first embodiment of the powder metering wheel of the provided powder inhaler at an angle;

[0062] Figure 14B yes Figure 14A A schematic diagram of the first embodiment of the powder metering wheel from another angle;

[0063] Figure 15A yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler when it is in the third position in the powder container;

[0064] Figure 15B yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler when it is in the fourth position in the powder container;

[0065] Figure 16A yes Figure 1A schematic diagram of the structure of the powder metering wheel of the provided powder inhaler at an angle in a second embodiment;

[0066] Figure 16B yes Figure 1 A schematic diagram of the powder metering wheel of the provided powder inhaler from another angle;

[0067] Figure 17A yes Figure 1 A schematic diagram showing the distribution of the first arc segment and the supporting rib of the powder metering wheel in the second embodiment of the powder delivery mechanism of the provided powder inhaler.

[0068] Figure 17B yes Figure 1 A schematic diagram showing the distribution of the first arc segment of the powder metering wheel in the second embodiment of the powder delivery mechanism of the provided powder inhaler and the supporting rib in another embodiment;

[0069] Figure 18A yes Figure 1 A schematic diagram of the structure of the inhalation trigger device of the provided powder inhaler when it is in a certain state on the powder container;

[0070] Figure 18B yes Figure 18A A schematic diagram of the provided suction triggering device when it is in another state on the powder container;

[0071] Figure 19A yes Figure 18A A schematic diagram of the structure of the provided suction trigger device after removing the powder container;

[0072] Figure 19B yes Figure 18B A schematic diagram of the structure of the provided suction trigger device after removing the powder container;

[0073] Figure 20A yes Figure 19A A schematic diagram of the provided inhalation triggering device from another angle;

[0074] Figure 20B yes Figure 19B A schematic diagram of the provided inhalation triggering device from another angle;

[0075] Figure 21A yes Figure 1 An exploded view of the counting mechanism of the provided powder inhaler;

[0076] Figure 21B yes Figure 21A A schematic diagram of the assembly structure of the provided counting mechanism;

[0077] Figure 22A yes Figure 21AA schematic diagram of the counter base of the provided counting mechanism at an angle;

[0078] Figure 22B yes Figure 21A A schematic diagram of the counter base provided from another angle;

[0079] Figure 23 yes Figure 1 A schematic diagram of the dosage protection plate of the inhalation trigger device for the provided powder inhaler;

[0080] Figure 24A yes Figure 1 A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in one state;

[0081] Figure 24B yes Figure 1 A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in another state;

[0082] Figure 24C yes Figure 24A A magnified view of a portion of the image;

[0083] Figure 24D yes Figure 24B A magnified view of a portion of the image;

[0084] Figure 24E yes Figure 1 A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in another state;

[0085] Figure 24F yes Figure 24E A magnified view of a portion of the image;

[0086] Figure 25A yes Figure 1 A schematic diagram of the air intake baffle of the inhalation trigger device of the provided powder inhaler at an angle;

[0087] Figure 25B yes Figure 25A A schematic diagram of the intake baffle from another angle;

[0088] Figure 25C yes Figure 25A A schematic diagram of the intake baffle at another angle is provided;

[0089] Figure 26A yes Figure 1 A schematic diagram of the front housing of the provided powder inhaler at an angle;

[0090] Figure 26B yes Figure 1A schematic diagram of the front housing of the provided powder inhaler from another angle;

[0091] Figure 27A yes Figure 21A A schematic diagram of the unit digit wheel of the provided counting mechanism at an angle;

[0092] Figure 27B yes Figure 27A A schematic diagram of the unit digit wheel from another angle;

[0093] Figure 28 yes Figure 21A A schematic diagram of the tens digit wheel of the provided counting mechanism;

[0094] Figure 29 This is a cross-sectional schematic diagram of another embodiment of the powder inhaler provided in this application;

[0095] Figure 30 This is a cross-sectional schematic diagram of yet another embodiment of the powder inhaler provided in this application;

[0096] Figure 31 yes Figure 1 A schematic diagram illustrating the opening and closing process of the powder inhaler;

[0097] Figure 32A yes Figure 1 A schematic diagram of the opening angle versus torque curve of one embodiment of the powder inhaler opening process;

[0098] Figure 32B yes Figure 1 A schematic diagram of the closing angle versus torque in one embodiment of the powder inhaler closing process.

[0099] Figure 33A yes Figure 1 A schematic diagram of the opening angle versus torque in another embodiment of the powder inhaler opening process;

[0100] Figure 33B yes Figure 1 A schematic diagram of the closing angle versus torque in another embodiment of the powder inhaler closing process;

[0101] Figure 34A yes Figure 1 A schematic diagram of the powder inhaler from a downward angle;

[0102] Figure 34B yes Figure 34A A schematic diagram of the powder inhaler placed on a horizontal plane;

[0103] Figure 34C yes Figure 34AA schematic diagram of the provided powder inhaler in handheld mode;

[0104] Figure 34D yes Figure 34A A diagram showing the powder inhaler after opening the cap in a handheld position;

[0105] Figure 34E yes Figure 34A A schematic diagram of the powder inhaler in oral inhalation mode. Detailed Implementation

[0106] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0107] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0108] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0109] See Figures 1 to 17B , Figure 1 This is a schematic diagram of the structure of a powder inhaler provided in an embodiment of this application in the unopened state. Figure 2 yes Figure 1 The provided schematic diagram shows the structure of the powder inhaler in the open state. Figure 3 yes Figure 1 A schematic diagram of the powder inhaler in another open-top state is provided. Figure 4 yes Figure 3 A schematic diagram of the powder inhaler from another angle is provided. Figure 5A yes Figure 1 A schematic diagram of the outer cover of the powder inhaler at an angle is provided. Figure 5B yes Figure 5A The provided structural diagram of the outer cover from another angle. Figure 6A yes Figure 1 The provided schematic diagram shows the structure of the powder inhaler at an angle after removing the outer cover. Figure 6B yes Figure 1 A schematic diagram of the powder inhaler from another angle after removing the outer cover. Figure 7A yes Figure 2 A schematic diagram of the powder inhaler from another angle is provided. Figure 7B yes Figure 7A A partially enlarged schematic diagram of the provided powder inhaler. Figure 8A yes Figure 1 The provided diagram shows the structure of the powder inhaler after removing the outer cover. Figure 8B yes Figure 8A A partially enlarged schematic diagram of the provided powder inhaler. Figure 9A yes Figure 1 A cross-sectional schematic diagram of the provided powder inhaler in one state after the outer cover has been removed. Figure 9B yes Figure 1 A cross-sectional schematic diagram of the provided powder inhaler in another state after the outer cover has been removed. Figure 9C yes Figure 1 The provided powder inhaler, with the outer cover removed, is shown in a cross-sectional diagram at another angle in one state. Figure 9D yes Figure 1 A schematic diagram of a cross-section of the powder inhaler at another angle in another state after the outer cover has been removed. Figure 9E yes Figure 9C A magnified view of a portion of region A. Figure 9F yes Figure 9D A magnified view of a portion of region A. Figure 9G yes Figure 9C A magnified view of a portion of region B. Figure 9H yes Figure 1 A schematic diagram of the L-shaped airflow channel of the provided powder inhaler. Figure 10A yes Figure 1 A schematic diagram of the drive cam of the provided powder inhaler at an angle. Figure 10B yes Figure 10A The provided schematic diagram shows the structure of the drive cam at another angle. Figure 10C yes Figure 10A The provided structural diagram of the drive cam at another angle Figure 11 yes Figure 1 A schematic diagram of the airbag inhaler provided. Figure 12A yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler in the third position in the powder container. Figure 12B yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler in the fourth position in the powder container. Figure 13A yes Figure 1 A schematic diagram of the powder container of the provided powder inhaler at an angle. Figure 13B yes Figure 13A A schematic diagram of the powder container from another angle is provided. Figure 14A yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the provided powder inhaler at an angle in the first embodiment. Figure 14B yes Figure 14A A schematic diagram of the first embodiment of the powder metering wheel from another angle. Figure 15A yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler in the third position in the powder container. Figure 15B yes Figure 1 A schematic diagram of the structure of the powder metering wheel of the powder delivery mechanism of the provided powder inhaler in the fourth position in the powder container. Figure 16A yes Figure 1 A schematic diagram of the second embodiment of the powder metering wheel of the provided powder inhaler at an angle. Figure 16B yes Figure 1 A schematic diagram of the powder metering wheel of the provided powder inhaler from another angle. Figure 17A yes Figure 1 A schematic diagram showing the distribution of the first arc segment and supporting rib of the powder metering wheel in the second embodiment of the powder delivery mechanism of the provided powder inhaler. Figure 17B yes Figure 1 A schematic diagram showing the distribution of the first arc segment of the powder metering wheel in the second embodiment of the powder delivery mechanism of the provided powder inhaler and the supporting rib in another embodiment.

[0110] See Figures 1 to 4 This application provides a powder inhaler, which includes a housing assembly (not shown) and functional mechanisms (…). Figures 1-4(Not shown) and an outer cover 4; wherein, the functional mechanism is disposed within the housing assembly, the outer cover 4 is connected to the housing assembly, and can be limited to reciprocating rotation between a first position and a second position. When the outer cover 4 is in the first position, the outer cover 4 is in a closed state; when the outer cover 4 is in the second position, the outer cover 4 is in an open state. The outer cover 4 and the functional mechanism are linked and cooperate, and the reciprocating rotation of the outer cover 4 between the first and second positions realizes the linked action of each functional mechanism, thereby enabling the powder inhaler to perform the function of dispensing powders such as medicine powder. The reciprocating rotation in this application refers to reciprocating along a repeated path, with the directions of the two rotations being opposite, for example, rotating clockwise from the first position to the second position, and then rotating counterclockwise from the second position back to the first position.

[0111] Specifically, the housing assembly includes a front housing 1, a rear housing 2, and an upper housing 3. The front housing 1, rear housing 2, and upper housing 3 are interconnected and cooperate to form an accommodating space. Functional mechanisms are housed within this accommodating space. An outer cover 4 is rotatably connected to the bottom end of the housing assembly, allowing it to rotate back and forth between a first position and a second position to achieve the opening and closing processes. The outer cover 4 can be rotatably connected to the bottom end of the housing assembly via a rotating shaft or via an arc-shaped slide rail. The shape and structure of the front housing 1, rear housing 2, upper housing 3, and outer cover 4 are not limited, and the materials can be metal or plastic, etc.

[0112] See Figure 1 , Figures 5A to 9B The outer cover 4 includes two connecting portions 406 arranged opposite each other along a first direction. The two connecting portions 406 are rotatably connected to opposite sides of the bottom end of the housing assembly and protrude from the bottom end of the housing assembly. Specifically, the two connecting portions 406 of the outer cover 4 are assembled and connected to the housing assembly via a pivot and hole fitting. See also... Figure 5A , Figure 5B , Figure 6A and Figure 8A and Figure 8B , Figure 9A and Figure 9B The powder inhaler also includes a drive gear 5, which is disposed inside the housing assembly. A drive shaft 501 is disposed on one end face of the drive gear 5. A first shaft hole 401 and a drive hole 402 are disposed on one of the connecting parts 406 of the outer cover 4, and a second shaft hole 404 is disposed on the other connecting part 406 of the outer cover 4. A first cylinder 105 is disposed on the front housing 1 corresponding to the first shaft hole 401 and the second shaft hole 404 respectively. The first shaft hole 401 and the second shaft hole 404 of the outer cover 4 cooperate with the corresponding first cylinder 105 of the front housing 1. The drive hole 402 of the outer cover 4 cooperates with the drive shaft 501 of the drive gear 5 so that the outer cover 4 is rotatably connected to the bottom end of the housing assembly.

[0113] like Figure 6BAs shown, the powder inhaler also includes a sealing ring 6, which is disposed between the connecting part 406 of the outer cover 4 and the drive gear 5 to seal, thereby ensuring the consistency of the airway and the consistency of the inhalation resistance of the powder inhaler, and preventing gas from entering the housing assembly from between the connecting part 406 of the drive gear 5 and the outer cover 4.

[0114] See Figure 5A , Figure 6A and Figure 7A and Figure 7B An arc-shaped rib 405 is provided on one of the connecting parts 406 of the outer cover 4, and an audible spring arm 108 is provided on the front housing 1. The arc-shaped rib 405 on the outer cover 4 is used to cooperate with the audible spring arm 108 on the front housing 1 to provide an audible prompt when the outer cover 4 rotates from the first position to the second position. Specifically, during the opening process of the outer cover 4, that is, during the rotation of the outer cover 4 from the first position to the second position, the audible spring arm 108 is located outside the arc-shaped rib 405 and moves along the outer periphery of the arc-shaped rib 405. After the outer cover 4 is fully opened, that is, when it rotates to the second position, the audible spring arm 108 cooperates with the arc-shaped rib 405 to provide an audible prompt when the cover is fully opened. During the closing process of the outer cover 4, that is, during the rotation of the outer cover 4 from the second position back to the first position, the outer cover 4 is located inside the arc-shaped rib 405. The outer cover 4 moves along the inner circumference of the arc-shaped rib 405, and after the outer cover 4 is closed in place, that is, when it rotates to the first position, the sound spring arm 108 cooperates with the arc-shaped rib 405 to realize the sound prompt that the cover is closed in place. For example, in a preferred embodiment, the angle of the outer cover 4 in the first position is defined as 0°, and the angle of the second position relative to the first position is 150°. During the opening process, when the outer cover 4 rotates from 0° to 150°, that is, when the rotation angle of the outer cover 4 is 150°, the arc-shaped rib 405 of the outer cover 4 contacts the sound spring arm 108 of the front shell 1 to realize the sound prompt function that the cover is opened in place. The angle of the outer cover 4 in the second position is not limited to 150°, and can be designed as needed, for example, it can be greater than or equal to 120° and less than or equal to 180°, as long as the outer cover 4 can expose the suction nozzle 101 in the second position.

[0115] See Figure 6A as well as Figures 12A to 13B The powder inhaler has an inhalation channel 706 and a mouthpiece 101. The mouthpiece 101 communicates with the inhalation channel 706, allowing the user to inhale the powder from the outlet 102 of the mouthpiece 101. Specifically, the housing assembly includes the mouthpiece 101, which is disposed on the front housing 1 and fitted onto the inhalation channel 706. When the outer cover 4 is configured in a first position, the outer cover 4 covers the outlet 102 of the mouthpiece 101; when the outer cover 4 is configured in a second position, the outlet 102 of the mouthpiece 101 is exposed.

[0116] Specifically, such as Figure 5AAs shown, the connecting portion 406 of the outer cover 4 is provided with two driving holes 402, which are respectively located on both sides of the first shaft hole 401. Two driving shafts 501 are provided on one end face of the driving gear 5, which are respectively located on both sides of the first cylinder 105 of the front housing 1. The two driving holes 402 and the two driving shafts 501 are connected in a one-to-one correspondence. In other embodiments, the driving holes 402 and driving shafts 501 can also be set to one, three, or other quantities. It is understood that the connection between the outer cover 4 and the driving gear 5 is not limited to the above method; it can also be integrally formed, glued, or welded, as long as the rotation of the outer cover 4 can drive the driving gear 5 to rotate.

[0117] like Figure 9A As shown, the powder inhaler also includes an intermediate gear 13, which is disposed within the housing assembly and meshes with the drive gear 5. Through the engagement between the outer cover 4 and the drive gear 5, the outer cover 4 drives the drive gear 5 and the functional mechanisms in a coordinated manner. Specifically, the outer cover 4 rotates around the first cylinder 105 of the front housing 1, and the drive hole 402 of the outer cover 4 drives the drive gear 5 to rotate synchronously, thereby achieving the linkage of various functional mechanisms through the intermediate gear 13.

[0118] The functional mechanisms include an air compression mechanism, a powder delivery mechanism, an inhalation trigger mechanism, and a counting mechanism. The rotation during the opening of the outer cover 4 activates the air compression mechanism to perform its compression function, and after compression, it activates the powder delivery mechanism to deliver the powder, such as medication, to the inhalation channel 706 of the powder inhaler. The inhalation trigger mechanism then activates the inhalation function, allowing the user to inhale the powder. Furthermore, when the outer cover 4 is closed, the air compression mechanism, powder delivery mechanism, and inhalation trigger mechanism reset, and the counting mechanism starts counting.

[0119] The following section introduces each functional mechanism.

[0120] (1) Compressor

[0121] See Figures 5A to 17B Specifically, the air compression mechanism includes an airbag presser 17, an airbag 18, an elastic element 19, and a drive cam 12. To facilitate understanding of the function of the air compression mechanism, the powder delivery mechanism is described here. The powder delivery mechanism includes a powder container 7 and a powder metering wheel 9. The powder metering wheel 9 has a dosing cup 902. The powder container 7 has a storage cavity 715 for storing powder. One end of the elastic element 19 acts on the airbag presser 17. The airbag presser 17 is used to squeeze the airbag 18 under the drive of the elastic element 19, so that the airbag 18 is compressed to achieve the air compression function. The airbag presser 17 is also used to squeeze the elastic element 19 under the action of the drive cam 12 and drive the airbag 18 to extend.

[0122] See Figures 12A to 13B Specifically, the storage cavity 715 has a powder outlet 713 at its first end and a compressed air port 714 at its second end. A compressed air bladder 18 is disposed at the second end of the storage cavity 715 and connected to the compressed air port 714. Specifically, the outer surface of the second end of the storage cavity 715 has an annular rib 701. The end of the compressed air bladder 18 near the powder container 7 engages with the annular rib 701 of the powder container 7, thus connecting the compressed air bladder 18 to the powder container 7. An air bladder compression member 17 is movably sleeved on the outside of the compressed air bladder 18 and the storage cavity 715. The elastic member 19 can be an elastic structure such as a spring. The air bladder compression member 17 is used to compress the compressed air bladder 18 under the drive of the elastic member 19. The air bladder compression member 17 can move back and forth between the fifth and sixth positions, causing the compressed air bladder 18 to compress air into the storage cavity 715, thereby achieving the compression function and facilitating the compression of powder from the powder outlet 713 into the dosing cup 902 of the powder metering wheel 9.

[0123] like Figure 9A , Figure 9B , Figure 11 , Figure 13A and Figure 13B As shown, the top wall of the airbag presser 17 has a fixing hole 1701 for connecting the top of the airbag 18. For example, the top of the airbag 18 can pass through the fixing hole 1701, and part of the airbag 18 is confined outside the top wall of the airbag presser 17, while another part is confined to the side of the top wall of the airbag presser 17 near the air inlet 714. This allows the airbag 18 to extend and retract through the movement of the airbag presser 17 and the cooperation of the elastic member 19. By having the airbag presser 17 extend and retract the airbag 18, the air compression efficiency of the airbag 18 can be improved, preventing the airbag 18 from malfunctioning due to failure to return to its original position.

[0124] The powder inhaler also includes a drive cam 12, which is disposed within the housing assembly. Specifically, refer to... Figure 9AThe powder inhaler also includes a gear bracket 14, which is disposed within the housing assembly. A drive cam 12 is mounted on the gear bracket 14. One end of the gear bracket 14 is connected to the powder metering wheel 9, and the other end is connected to the drive cam 12. The outer cover 4 drives the drive gear 5 in conjunction with the outer cover 4. The drive gear 5 meshes with the intermediate gear 13, which in turn meshes with the drive cam 12, enabling the drive cam 12 and the drive gear 5 to rotate in the same direction. It is understood that the drive gear 5 and / or the intermediate gear 13 can be omitted in this application, as long as the rotation of the outer cover 4 can drive the cam 12 to rotate. The drive cam 12 and the elastic element 19 are used to drive the airbag inflator 17 to move back and forth between the fifth and sixth positions, thereby causing the airbag 18 to extend and retract to achieve the functions of inflating and resetting. Specifically, the elastic element 19 is disposed on one side of the top wall of the airbag pressure member 17. One end of the elastic element 19 abuts against the top wall of the airbag pressure member 17, and the other end abuts against the top wall of the upper housing 3 to drive the airbag pressure member 17 to move. The drive cam 12 rotates to make way for the airbag pressure member 17, and the elastic element 19 drives the airbag pressure member 17 to move from the fifth position to the sixth position. The drive cam 12 squeezes the airbag pressure member 17, and the airbag pressure member 17 resets and moves from the sixth position to the fifth position and squeezes the elastic element 19.

[0125] See Figures 10A to 11 The airbag inflator 17 has a protruding rod 1704 at one end of its sidewall away from the top wall, and an arc surface 1703 at the other end of its protruding rod 1704 away from the top wall. The drive cam 12 has a cam surface 1202, and the arc surface 1703 is used to cooperate with the cam surface 1202 of the drive cam 12 to realize the reciprocating movement of the airbag inflator 17 between the fifth position and the sixth position. Specifically, when the airbag inflator 17 is in the fifth position, the arc surface 1703 of the protruding rod 1704 of the airbag inflator 17 abuts against the side of the drive cam 12, and the arc surface 1703 of the airbag inflator 17 is confined within the arc-shaped groove 1201 of the drive cam 12. At this time, the top wall of the airbag inflator 17 compresses the elastic member 19 to put it in a compressed state, and the top wall of the airbag inflator 17 stretches the airbag 18 to put it in an extended state. During the opening process of the outer cover 4, the drive cam 12 is driven to rotate, the elastic element 19 extends continuously, and the elastic force of the elastic element 19 drives the airbag pressure member 17 to move vertically downward. That is, the elastic element 19 drives the airbag pressure member 17 to move from the fifth position to the sixth position. The arc surface 1703 of the airbag pressure member 17 moves along the cam surface 1202 of the drive cam 12. The downward movement of the airbag pressure member 17 compresses the airbag 18 and compresses air into the storage cavity 715.

[0126] In one embodiment, the tooth ratio between the drive gear 5 and the drive cam 12 is 18:15. That is, when the outer cover 4 opens 150°, the drive gear 5 rotates 150° synchronously, and at this time, the rotation angle of the drive cam 12 is 180°. It can be understood that setting the tooth ratio between the drive gear 5 and the drive cam 12 to 18:15 can reduce the size of the drive gear 5 and save space. In other embodiments, the powder inhaler may not have a drive gear 5 and an intermediate gear 13; instead, the outer cover 4 and the drive cam 12 can be directly linked. The rotation of the outer cover 4 drives the rotation of the drive cam 12, thereby achieving the linkage of the functional mechanisms.

[0127] Specifically, such as Figures 9A to 11 As shown, the drive cam 12 includes a body portion 1200 and a gear 1203. The gear 1203 is coaxially connected to the body portion 1200 and is used to drive the body portion 1200 to rotate. The gear 1203 meshes with the intermediate gear 13. One surface of the body portion 1200 has a guide groove 1209, and the side of the guide groove 1209 is a cam surface 1202. The cam surface 1202 cooperates with the arc surface 1703 of the airbag inflator 17 to achieve reciprocating movement of the airbag inflator 17 between the fifth and sixth positions. Specifically, the drive cam 12 has a first central hole 1204. The gear 1203 is disposed on one surface of the body portion 1200 and surrounds the first central hole 1204. The first central hole 1204 penetrates the body portion 1200 and the gear 1203. The first central hole 1204 of the drive cam 12 is fitted onto the gear bracket 14 of the powder inhaler. The guide groove 1209 is located on the surface of the body 1200 facing the gear 1203, and the guide groove 1209 is spaced apart from the gear 1203. The airbag pressure member 17 moves up and down longitudinally between the fifth and sixth positions. In this application, the cam surface 1202 of the drive cam 12 directly abuts against the protrusion 1704 of the airbag pressure member 17, simplifying the structure of the air compression mechanism and improving the stability of the air compression mechanism operation. In one embodiment, the air compression mechanism includes only four independent components: the airbag pressure member 17, the compressed airbag 18, the elastic member 19, and the drive cam 12, making the air compression mechanism structure simple.

[0128] In some embodiments, the protrusion 1704 of the airbag inflator 17 has a pointed end away from the top wall, and the end face of the pointed end is an arc surface 1703. The outer peripheral side of the body portion 1200 of the drive cam 12 has an arc-shaped groove 1201. When the airbag inflator 17 is configured in the fifth position, the pointed end of the protrusion 1704 is embedded in the arc-shaped groove 1201 of the body portion 1200 to achieve initial positioning and preliminary limiting of the airbag inflator 17.

[0129] In one specific embodiment, the arc-shaped groove 1201 is a circular arc-shaped groove, the bottom surface of the arc-shaped groove 1201 is circular arc-shaped, and the arc surface 1703 of the protrusion 1704 is a circular arc surface. It can be understood that by providing the arc-shaped groove 1201 on the cam surface 1202 of the drive cam 12, and embedding the arc surface 1703 of the protrusion 1704 in the arc-shaped groove 1201, the airbag pressure member 17 is initially positioned and initially limited, so that the movement of the air compression mechanism needs to overcome the resistance of the upward movement of the arc surface 1703 of the airbag pressure member 17 as it disengages from the arc-shaped groove 1201, which can effectively prevent the false triggering of the air compression mechanism.

[0130] In one specific embodiment, the bottom surface of the arc-shaped groove 1201 is arc-shaped, and the arc surface 1703 of the protruding rod 1704 is arc-shaped. During the process of the arc surface 1703 of the protruding rod 1704 moving from one side of the bottom surface of the arc-shaped groove 1201 to the other side, the protruding rod 1704 remains stationary, and the outer cover 4 rotates during a free stroke.

[0131] Further, see Figures 9A to 13B The storage cavity 715 of the powder container 7 has a vent 709 on its side wall, and the airbag pressure member 17 has a pressure relief hole 1702 on its side wall, such as Figure 9C and Figure 9E As shown, when the airbag inflator 17 is configured in the fifth position, the side wall of the airbag inflator 17 blocks the vent 709, and the vent 709 is not connected to the pressure relief hole 1702; as Figure 9D and Figure 9F As shown, when the airbag compression member 17 is configured in the sixth position, the pressure relief hole 1702 is connected to the vent hole 709. During the movement of the airbag compression member 17 from the fifth position to the sixth position, air is first compressed into the storage cavity 715 through the compressed airbag 18, so that the powder in the storage cavity 715 is filled and compacted into the dosing cup 902 of the powder metering wheel 9 through the powder outlet 713, which facilitates the improvement of powder filling consistency. After the pressure relief hole 1702 is connected to the vent hole 709, the pressure in the storage cavity 715 is released to release the pressure in the storage cavity 715 of the powder container 7 to normal pressure, so as to avoid excessive pressure in the storage cavity 715 due to the lack of pressure relief in the subsequent powder delivery process, which would cause the powder to leak from the gap when the powder metering wheel 9 of the powder delivery mechanism rotates, thus reducing powder waste. That is, during the movement of the airbag compressor 17 from the fifth position to the sixth position, a compression process is performed first, followed by a decompression process. The decompression process occurs in the later stage of the downward stroke of the airbag compressor 17. Since the decompression process of the storage cavity 715 is completed before the powder metering wheel 9 rotates from the third position to the fourth position, less powder will leak from the powder outlet 713 under air pressure after the powder metering wheel 9 begins to rotate from the third position to the fourth position.

[0132] For details, see Figure 9Cand Figure 9D In some embodiments, a filter membrane 25 is provided at the second end of the storage cavity 715. The filter membrane 25 is located at the air pressure port 714 and spaced apart from the port of the air pressure port 714, isolating the space of the air pressure bladder 18 from the internal space of the storage cavity 715. The filter membrane 25 can be a waterproof and breathable membrane, capable of filtering impurities in powders such as pharmaceutical powders, as well as moisture, to prevent the powder inside the storage cavity 715 from becoming damp. A vent 709 is provided on the side wall of the storage cavity 715. One end of the vent 709 connects to the space between the filter membrane 25 and the air pressure bladder 18; that is, the vent 709 is not directly connected to the interior of the storage cavity 715 and is relatively independent of it. After the vent 709 connects to the pressure relief hole 1702, the gas in the space between the filter membrane 25 and the air pressure bladder 18 can be discharged after passing through the vent 709 and the pressure relief hole 1702 in sequence, thereby relieving pressure in the space between the filter membrane 25 and the air pressure bladder 18. Meanwhile, since the filter membrane 25 is a breathable membrane, the gas in the storage cavity 715 can also pass through the filter membrane 25 and enter the space between the filter membrane 25 and the compressed air bag 18, and then leak out from the vent 709 to depressurize the storage cavity 715, preventing the vent 709 from directly communicating with the inside of the storage cavity 715. During the depressurization process, the gas in the storage cavity 715 will leak directly from the vent 709, causing the powder in the storage cavity 715 to fly or leak. During the extension of the air bladder 18, i.e., during the air intake process of the air bladder 18, external gas enters the space between the filter membrane 25 and the air bladder 18 through the vent 709, and then passes through the filter membrane 25 into the storage cavity 715. This prevents the vent 709 from directly communicating with the inside of the storage cavity 715. If external gas directly enters the storage cavity 715 through the vent 709 during the air intake process of the air bladder 18, it would bring external water molecules into the storage cavity 715, causing the powder inside the storage cavity 715 to become airborne or damp, resulting in waste. In addition, the filter membrane 25 also prevents the powder from entering the air bladder 18 from the storage cavity 715, thus preventing powder waste.

[0133] See Figure 13A The storage cavity 715 of the powder container 7 is also provided with a receiving cavity 702 on its side wall. The receiving cavity 702 is used to store desiccant. The storage cavity 715 and the receiving cavity 702 have a common side wall, which can be made of a water-permeable material so that the desiccant in the receiving cavity 702 can absorb the moisture in the storage cavity 715 and prevent the powder in the storage cavity 715 from getting damp.

[0134] In a preferred embodiment, during the movement of the airbag inflator 17 from the fifth position to the sixth position, the downward stroke of the airbag inflator 17 is within the range of 2mm-6mm. For example, in a specific embodiment, the downward stroke of the airbag inflator 17 is 3.5mm, wherein the first 3mm of the downward stroke is the inflation stroke, and the last 0.5mm of the downward stroke is the deflation stroke. When the downward stroke of the airbag inflator 17 reaches 3mm, the deflation hole 1702 and the vent hole 709 are at the critical point of connection. When the downward stroke of the airbag inflator 17 is between 3mm and 3.5mm, the deflation hole 1702 and the vent hole 709 are connected to achieve deflation. The angle of the outer cover 4 in the first position is defined as 0°, and the angle of the outer cover 4 in the second position is 150°. When the downward stroke of the airbag pressure member 17 of the air compressor is 3.5mm, that is, when the airbag pressure member 17 is in the sixth position, the angle of the outer cover 4 is 62.5°, which drives the rotation angle of the drive gear 5 to be 62.5°, and the corresponding rotation angle of the drive cam 12 is 75°.

[0135] More preferably, during the opening process, when the outer cover 4 rotates at 55°, the downward stroke of the airbag pressure member 17 reaches 3mm, and the air compression mechanism completes the process of compressing and discharging the powder in the powder container 7, i.e., the air compression process. When the outer cover 4 rotates at 62.5°, the pressure relief process is completed, releasing the compressed gas in the powder container 7 to atmospheric pressure, thus preventing powder leakage when the powder metering wheel 9 rotates. It is understood that the above angle selection is only an example, and other angle ranges can also be selected.

[0136] See Figures 10A to 10C In some embodiments, the cam surface 1202 includes a first curved surface segment 1211 and a second curved surface segment 1212 connected to each other, with the second curved surface segment 1212 located at the end of the first curved surface segment 1211 away from the arcuate groove 1201. The first curved surface segment 1211 is a non-circular arc surface, the second curved surface segment 1212 is a circular arc surface, and the second curved surface segment 1212 is concentrically arranged with the outer peripheral surface of the body portion 1200.

[0137] It is understandable that by setting the first curved surface segment 1211 as a non-circular arc surface, during the closing process of the outer cover 4 of the powder inhaler, the driving cam 12 rotates in the opposite direction. The rotation of the first curved surface segment 1211 drives the airbag pressure member 17 to reset from the sixth position to the fifth position. Specifically, during the process of the airbag pressure member 17 resetting from the sixth position to the fifth position, the arc surface 1703 of the protrusion 1704 of the airbag pressure member 17 abuts against the first curved surface segment 1211. The first curved surface segment 1211 is a non-circular arc surface. The reverse rotation of the first curved surface segment 1211 pushes the protrusion 1704 of the airbag pressure member 17 to move upward continuously, thereby realizing the reset of the airbag pressure member 17.

[0138] Preferably, the first curved surface segment 1211 includes a first arcuate surface segment 1214, a flat surface segment 1215, and a second arcuate surface segment 1216 connected to each other. The flat surface segment 1215 is located between the first arcuate surface segment 1214 and the second arcuate surface segment 1216, and the flat surface segment 1215 is located at the end of the first arcuate surface segment 1214 away from the arcuate groove 1201. During the opening process of the outer cover 4, as the airbag pressure member 17 moves from the fifth position to the sixth position, it must first overcome the resistance of the side wall of the arcuate groove 1201 near the first arcuate surface segment 1214 on the arcuate surface 1703 of the protrusion 1704, so that the tip of the protrusion 1704 disengages from the arcuate groove 1201. This process is the opening idle stroke and requires a large torque to prevent accidental opening of the cover.

[0139] In one embodiment, the angle of the outer cover 4 in the first position is defined as 0°, and the angle of the outer cover 4 in the second position is 150°. The process of the outer cover 4 rotating from 0° to 12° is the open-cover idle stroke. The process of the outer cover 4 rotating from 0° to 8° is the first open-cover idle stroke, and the process of the outer cover 4 rotating from 8° to 12° is the second open-cover idle stroke. During the first open-cover idle stroke, the outer cover 4 rotates so that the arc surface 1703 of the tip of the protrusion 1704 abuts against the end of the arc groove 1201 away from the first arc surface segment 1214 and against the end of the arc groove 1201 close to the first arc surface segment 1214. That is, the arc surface 1703 of the tip of the protrusion 1704 sweeps across the bottom surface of the arc groove 1201. Preferably, the torque during this process is 0.05 N·m, which can effectively prevent accidental opening of the cover due to non-human factors. During the second open-cover idle stroke, the outer cover 4 needs to rotate so that the arc surface 1703 at the tip of the protruding rod 1704 abuts against the first arc surface segment 1214 at the end of the arc groove 1201. That is, the arc surface 1703 at the tip of the protruding rod 1704 needs to be disengaged from the arc groove 1201. This requires a larger torque than the first open-cover idle stroke. Preferably, the torque during the second open-cover idle stroke is 0.15 N·m. Setting a larger opening resistance can more effectively prevent accidental opening of the cover.

[0140] During the opening process of the outer cover 4, when the outer cover 4 rotates to 12°, the arc surface 1703 of the tip of the protrusion 1704 of the airbag pressure member 17 disengages from the arc groove 1201 and abuts against the first arc surface section 1214, and the opening idle stroke of the outer cover 4 is completed. Afterwards, during the process of the outer cover 4 rotating from 12° to 62.5°, the air compression mechanism performs the air compression process and the air release process. At this time, the outer cover 4 performs the first opening load stroke.

[0141] As the outer cover 4 rotates to 12°, the arc surface 1703 of the tip of the protrusion 1704 disengages from the arc groove 1201, the outer cover 4 opens instantaneously and rotates from 12° to 55°, causing the drive cam 12 to rotate instantaneously to 66°. At this time, the protrusion 1704 of the airbag pressure member 17 also moves down instantaneously, and the arc surface 1703 of the tip of the protrusion 1704 moves instantaneously to abut against the end of the flat section 1215 near the second arc section 1216. The downward stroke of the protrusion 1704 of the airbag pressure member 17 reaches 3mm, and the air compression mechanism realizes the function of instantaneous air compression. When the outer cover 4 rotates to 55°, the pressure relief hole 1702 and the vent hole 709 are at the critical point of connection. During the rotation of the outer cover 4 from 55° to 62.5°, the drive cam 12 rotates from 66° to 75°. The tip of the protrusion 1704 of the airbag pressure member 17 abuts against the end of the second arc-shaped section 1216 near the flat section 1215 and the end of the second arc-shaped section 1216 away from the flat section 1215. That is, the tip of the protrusion 1704 slides across the second arc-shaped section 1216. During this process, the downward stroke of the protrusion 1704 of the airbag pressure member 17 is between 3mm and 3.5mm. The pressure relief hole 1702 and the vent hole 709 are connected to achieve pressure relief. The torque of the outer cover 4 is constant during the first opening load stroke. Preferably, the torque of the outer cover 4 during the first opening load stroke is 0 N·m, that is, the torque of the outer cover 4 during the rotation from 12° to 62.5° is 0 N·m. This is beneficial for the outer cover 4 to open instantaneously, so that the air compressor can quickly and instantaneously compress air, thereby improving the air compression effect.

[0142] When the outer cover 4 rotates to 62.5°, the arc surface 1703 of the tip of the protrusion 1704 of the airbag pressure member 17 is at the critical point between the first curved surface segment 1211 and the second curved surface segment 1212. As the outer cover 4 continues to rotate from 62.5° to 150°, the drive cam 12 rotates from 75° to 180°, and the arc surface 1703 of the protrusion 1704 of the airbag pressure member 17 abuts from the end of the second curved surface segment 1212 that is close to the first curved surface segment 1211 to the end of the second curved surface segment 1212 that is far away from the first curved surface segment 1211. Since the second curved surface segment 1212 is an arc surface, and the second curved surface segment 1212 is concentrically set with the outer peripheral side of the main body 1200 and the pitch circle of the gear 1203, the protrusion 1704 of the airbag pressure member 17 remains in the sixth position, that is, at 3.5mm, during the process of the outer cover 4 rotating from 62.5° to 150°, and the protrusion 1704 of the airbag pressure member 17 will not move.

[0143] See Figures 1 to 11The second curved section 1212 of the drive cam 12, away from the first curved section 1211, is provided with a stop groove 1213. After the outer cover 4 is fully opened, the tip of the protrusion 1704 of the airbag pressure member 17 is located in the stop groove 1213. The gravity of the airbag pressure member 17 acts on the drive cam 12, causing the tip of the protrusion 1704 of the airbag pressure member 17 to limit the drive cam 12, preventing the drive cam 12 from being stopped by the return spring 15 (such as the return spring 15) after the user releases the hand after the cover is fully opened. Figure 20A The reverse rotation caused by the action of the outer cover leads to the automatic closing of the cover after it has been opened to the correct position. In one specific embodiment, the stop groove 1213 is an arc-shaped groove with an arc-shaped bottom surface, so as to facilitate a better fit between the tip of the protruding rod 1704 and the stop groove 1213.

[0144] (2) Powder delivery mechanism

[0145] See Figures 12A to 17B The powder delivery mechanism includes a powder container 7 and a powder metering wheel 9, which is rotatably connected to the powder container 7. Specifically, the powder container 7 has a storage cavity 715, a suction channel 706, and a first cylindrical groove 716. The powder metering wheel 9 is installed in the first cylindrical groove 716 and can rotate back and forth between a third position and a fourth position. In the third position, the dosing cup 902 of the powder metering wheel 9 is in the powder filling position, and in the fourth position, the dosing cup 902 of the powder metering wheel 9 is in the powder suction position, which corresponds to the position of the suction channel 706. It should be noted that the back-and-forth rotation of the powder metering wheel 9 between the third and fourth positions in this application is along a minor arc, that is, the direction of rotation of the powder metering wheel 9 from the third position to the fourth position is opposite to the direction of rotation from the fourth position to the third position. It is not achieved by rotating a full circle along the inner circumference of the first cylindrical groove 716 to achieve the back-and-forth rotation between the third and fourth positions. By having the powder metering wheel 9 rotate back and forth between the third and fourth positions along a minor arc, the movement path of the powder metering wheel 9 can be minimized, allowing it to move along the optimal path. This can more effectively avoid the waste and loss of powder in the dosing cup 902 during the movement of the powder metering wheel 9.

[0146] The powder metering wheel 9 includes a dosing cup 902. When the powder metering wheel 9 is configured in the third position, the dosing cup 902 is correspondingly arranged with the powder outlet 713 of the storage cavity 715 to receive powder from the powder container 7. When the powder metering wheel 9 is configured in the fourth position, the dosing cup 902 is correspondingly arranged with the inlet 704 of the inhalation channel 706. Specifically, during the process of the airbag press member 17 moving from the fifth position to the sixth position, the powder metering wheel 9 is in the third position. The airbag press member 17 acts on the compressed airbag 18 under the drive of the elastic member 19, and fills and compacts the powder in the storage cavity 715 into the dosing cup 902 of the powder metering wheel 9.

[0147] See Figure 13A , Figure 14A and Figure 14B Specifically, the powder metering wheel 9 is installed in the first cylindrical groove 716. In the first embodiment, as shown... Figure 14A and Figure 14B As shown, the powder metering wheel 9 has an outer arc surface 901, which is fitted to the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. In this embodiment, the outer arc surface 901 of the powder metering wheel 9 is an arc-shaped annular surface covering the reciprocating stroke. In one embodiment, the arc corresponding to the arc of the outer arc surface 901 is greater than or equal to 140° and less than or equal to 170°. Preferably, the arc corresponding to the arc of the outer arc surface 901 is approximately 150°.

[0148] See Figure 13A and Figure 14B The powder container 7 has a second cylinder 703 in the first cylindrical groove 716, the powder metering wheel 9 has a second central hole 906, and the first end of the powder metering wheel 9 has a first clamping spring arm 909, which is disposed around the second central hole 906. The first clamping spring arm 909 of the powder metering wheel 9 is configured to cooperate with the second cylinder 703 in the first cylindrical groove 716 of the powder container 7. Specifically, the second cylinder 703 in the first cylindrical groove 716 is assembled in the second central hole 906. The first clamping spring arm 909 abuts against the second cylinder 703 in the first cylindrical groove 716. The inner diameter of the first clamping spring arm 909 is smaller than the outer diameter of the second cylinder 703. Therefore, during assembly, the first clamping spring arm 909 undergoes elastic deformation. The elastic deformation of the first clamping spring arm 909 of the powder metering wheel 9 provides clamping force so that the inner arc surface 705 of the first cylindrical groove 716 fits against the outer arc surface 901 of the powder metering wheel 9, improving the sealing reliability and making the powder metering wheel 9 more tightly assembled in the first cylindrical groove 716 of the powder container 7, which facilitates a good assembly connection between the powder metering wheel 9 and the powder container 7.

[0149] A dosing cup 902 is provided on the outer surface of the powder metering wheel 9. Specifically, the dosing cup 902 is disposed on the outer arc surface 901 of the powder metering wheel 9 and is used to contain powder. In a preferred embodiment, only one dosing cup 902 is provided on the outer arc surface 901 of the powder metering wheel 9. The powder filling and delivery are achieved by the reciprocating rotation of the powder metering wheel 9 between the third and fourth positions, driving the dosing cup 902 to reciprocate between the inlet 704 and the powder outlet 713 of the suction channel 706, thereby facilitating the user's aspiration. Specifically, the shape of the dosing cup 902 can be any shape, such as hemispherical, conical, or square groove, as long as the shape of the dosing cup 902 can approximately match the shape of the powder outlet 713 of the powder container 7, so that the powder stored in the powder container 7 can be smoothly filled into the dosing cup 902 through the powder outlet 713 without leakage.

[0150] It is understandable that the amount of powder contained in a single dosing cup 902 is fixed, and the amount of powder entering the inhalation channel 706 during user inhalation is also fixed. This avoids the possibility of excessive powder intake caused by having multiple dosing cups 902 spaced circumferentially on the outer surface of a cylindrical metering component, which would allow multiple doses to be continuously distributed into the inhalation channel 706 during rotation of the metering component. Alternatively, if a series of dosing slots or a single dosing slot are provided on the surface of a flat metering component, the inhalation position and the open position of the outer cover 4 may not be consistent during powder delivery via translation, leading to the user inhaling multiple doses of powder in a single inhalation and thus causing excessive powder intake. In other words, by providing only one dosing cup 902 on the outer arc surface 901 of the powder metering wheel 9, the amount of powder inhaled by the user at the outlet 102 of the nozzle 101 is fixed, eliminating the possibility of inhaling multiple doses of powder. This allows for precise control of the powder intake and simplifies the structure.

[0151] In other embodiments, a dosing cup 902 provided on the outer arc surface 901 of the powder metering wheel 9 may also include multiple sub-dosing cups. That is, at one position, a dosing cup 902 can be divided into multiple sub-dosing cups that are spaced apart from each other. For example, one or more partitions can be provided in the dosing cup 902 to divide the dosing cup 902 into multiple sub-dosing cups. Alternatively, in other embodiments, multiple dosing cups 902 can be provided at intervals on the outer arc surface 901 of the powder metering wheel 9, as long as the amount of powder contained in the dosing cup 902 is fixed at a fixed position, so as to facilitate precise control of the amount of powder inhaled by the user.

[0152] See Figure 14AIn one embodiment, a first scraping groove 903 is further provided on the outer arc surface 901 of the powder metering wheel 9. The first scraping groove 903 is a notch provided on the outer arc surface 901. Specifically, the first scraping groove 903 is inclined to the circumference of the powder metering wheel 9. The first scraping groove 903 is used to scrape off and discharge the fine powder adhering to the inner arc surface 705 of the powder container 7, so as to avoid the fine powder on the inner arc surface 705 of the powder container 7 from blocking the movement of the powder metering wheel 9 and improve the smoothness of the movement of the powder metering wheel 9 in the first cylindrical groove 716 of the powder container 7. Preferably, the depth of the first scraping groove 903 is 0.2mm-0.4mm.

[0153] In one embodiment, a second scraping groove 904 is further provided on the outer arc surface 901 of the powder metering wheel 9. The depth of the second scraping groove 904 is greater than the depth of the first scraping groove 903. Preferably, the depth of the second scraping groove 904 is 0.7mm-0.9mm. The second scraping groove 904 is used to scrape off and discharge large particles of powder adhering to the inner arc surface 705 of the powder container 7, so as to further improve the smoothness of movement of the powder metering wheel 9 in the first cylindrical groove 716 of the powder container 7. In some embodiments, the width of the second scraping groove 904 may also be greater than the width of the first scraping groove 903. Along the direction of the powder metering wheel 9 from the third position to the fourth position, the second powder scraping groove 904 is located on the side of the first powder scraping groove 903 away from the dosing cup 902. This facilitates the process of the powder metering wheel 9 moving from the third position to the fourth position, that is, during the drug delivery stroke of the powder metering wheel 9. First, the second powder scraping groove 904 scrapes off and discharges the large powder particles attached to the inner arc surface 705 of the powder container 7, reducing the resistance of the large powder particles to the movement of the powder metering wheel 9. Then, the first powder scraping groove 903 scrapes off and discharges the remaining fine powder attached to the inner arc surface 705 of the powder container 7, so as to better ensure the smooth movement of the powder metering wheel 9 in the first cylindrical groove 716 of the powder container 7. The first scraping groove 903 and the second scraping groove 904 have different sizes. During the administration and reset strokes of the powder metering wheel 9, that is, during the process of the powder metering wheel 9 turning from the fourth position to the third position, the first scraping groove 903 and the second scraping groove 904 can clean the powder on the inner arc surface 705 of the powder container 7 multiple times and in multiple gradients, which can further improve the accuracy of the dosage of the powder.

[0154] In one embodiment, the end face of the first end of the powder metering wheel 9 has a first rib 908. The first rib 908 avoids friction between the plane and adjacent parts, and improves the smoothness of the reciprocating motion of the powder metering wheel 9 through the contact friction of the rib.

[0155] In one embodiment, the end face of the second end of the powder metering wheel 9 has a second rib 907. The second rib 907 avoids friction between the plane and adjacent parts, and improves the smoothness of the reciprocating motion of the powder metering wheel 9 through the contact friction of the rib.

[0156] In one embodiment, the end face of the first end of the powder metering wheel 9 has a first rib 908 and the second end has a second rib 907.

[0157] In one implementation, see Figure 14B The first end of the powder metering wheel 9 also has a groove 911 and a drive spring arm 910. The groove 911 is located around the second central hole 906. One end of the drive spring arm 910 is connected to the side wall of the groove 911, and the other end is a free end. The drive spring arm 910 is spaced apart from the first clamping spring arm 909. One end of the wedge-shaped post 1005 of the dose protection plate 10 extends into the groove 911. The drive spring arm 910 is used to abut against the wedge-shaped post 1005 of the dose protection plate 10 to drive the dose protection plate 10 to rotate and reset. The groove 911 can also reduce the weight of the powder metering wheel 9 and make it easier to drive the powder metering wheel 9 to rotate. The specific method and process of the drive spring arm 910 driving the dose protection plate 10 to rotate and reset will be described in detail in the subsequent process of the outer cover 4 closing trigger function mechanism reset. It will not be explained in detail here.

[0158] See Figure 10B and Figure 14A The surface of the drive cam 12's body 1200 facing away from the gear 1203 also has an annular boss 1207. The annular boss 1207 is coaxially arranged with the gear 1203 and is used to drive the powder metering wheel 9 to rotate. Specifically, the second end of the powder metering wheel 9 has a first boss 905, which is used to cooperate with the annular boss 1207 of the drive cam 12 to achieve rotational drive. Specifically, the two annular bosses 1207 are centrally symmetrical about the center of the first central hole 1204, and the two first bosses 905 are centrally symmetrical about the center of the second central hole 906.

[0159] In another embodiment, such as Figures 15A to 17BAs shown, the powder metering wheel 9 includes a first arc segment 912 and a second arc segment 913. The first arc segment 912 and the second arc segment 913 are spaced apart from each other along the circumference of the powder metering wheel 9. The first arc segment 912 has a first arc surface 914, and a dosing cup 902 is provided on the first arc surface 914. That is, the dosing cup 902 is provided on the first arc surface 914. The first arc segment 912 is configured to be elastically deformable in the radial direction of the powder metering wheel 9. Here, the elastic deformation of the first arc segment 912 in the radial direction of the powder metering wheel 9 specifically refers to the adjustable diameter of the first arc surface 914. More specifically, compared to the first arc segment 912 being in a non-deformed state (natural state), when the first arc segment 912 undergoes elastic deformation in the radial direction of the powder metering wheel 9, the diameter of the first arc surface 914 can become smaller.

[0160] It is understood that in this embodiment, the powder metering wheel 9 is divided into a first arc segment 912 and a second arc segment 913 arranged circumferentially, and the dosing cup 902 is disposed on the first arc surface 914 of the first arc segment 912. The first arc segment 912 is configured to be elastically deformable in the radial direction of the powder metering wheel 9. The diameter of the first arc surface 914 in the non-deformed state can be set to be greater than or equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. During the process of assembling the powder metering wheel 9 into the first cylindrical groove 716 of the powder container 7, the diameter of the first arc surface 914 can be reduced by causing the first arc segment 912 to elastically deform in the radial direction of the powder metering wheel 9. This makes it easier to assemble the powder metering wheel 9 into the first cylindrical groove 716 of the powder container 7. Simultaneously, after the powder metering wheel 9 is assembled into the first cylindrical groove 716 of the powder container 7, the elastic potential energy of the first arc segment 912 allows the first arc surface 914, where the dosing cup 902 is located, to achieve stable and good contact with the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. This ensures an interference fit or tight fit between the first arc surface 914 and the inner arc surface 705 of the first cylindrical groove 716, guaranteeing an effective seal between the inner arc surface 705 of the first cylindrical groove 716 and the dosing cup 902 on the first arc surface 914. This effectively prevents powder leakage from the dosing cup 902 during powder delivery. The tight fit in this application means that the diameter of the first arc surface 914 in its undeformed state is equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. During assembly, the diameter of the first arc surface 914 becomes less than or equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. After assembly, the diameter of the first arc surface 914 returns to being equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. The interference fit means that the diameter of the first arc surface 914 in its undeformed state is greater than the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. During assembly, the diameter of the first arc surface 914 becomes less than or equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. After assembly, the diameter of the first arc surface 914 only returns to being equal to the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7.

[0161] The structure described in this embodiment solves the problem in the prior art where the outer arc surface 901 of the powder metering wheel 9 is a continuous and complete circular arc surface, and the diameter of the outer arc surface 901 of the powder metering wheel 9 is not adjustable. Due to the machining tolerance of the outer arc surface 901 of the powder metering wheel 9 and considering the assembly of the powder metering wheel 9 in the first cylindrical groove 716 of the powder container 7, the diameter of the outer arc surface 901 of the powder metering wheel 9 is slightly smaller than the diameter of the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7. As a result, after the powder metering wheel 9 is assembled into the first cylindrical groove 716 of the powder container 7, there is a gap between the outer arc surface 901 of the powder metering wheel 9 and the inner arc surface 705 of the first cylindrical groove 716, which cannot achieve a tight fit. Consequently, the dosing cup 902 set on the outer arc surface 901 of the powder metering wheel 9 cannot be effectively sealed by the inner arc surface 705 of the first cylindrical groove 716, resulting in powder leakage from the dosing cup 902.

[0162] Specifically, such as Figure 16A and Figure 16BAs shown, in this embodiment, the powder metering wheel 9 has a bearing ring 915 at its center, which forms a second central hole 906. The bearing ring 915 is spaced apart from the first arc segment 912 and connected by a support rib 916, that is, the support rib 916 is disposed between the bearing ring 915 and the first arc segment 912. Specifically, along the circumference of the powder metering wheel 9, the first arc segment 912 includes a first sub-arc segment 917 and a second sub-arc segment 918 located on both sides of the support rib 916. The first sub-arc segment 917 and the second sub-arc segment 918 can elastically deform to change the curvature of the first arc surface 914. The first sub-arc segment 917 and the second sub-arc segment 918 being located on both sides of the support rib 916 means that: if there is only one support rib 916, the first sub-arc segment 917 and the second sub-arc segment 918 are the portions of the first arc segment 912 extending circumferentially from the side of the support rib 916; if there are multiple support ribs 916, the first sub-arc segment 917 and the second sub-arc segment 918 are the portions of the first arc segment 912 extending circumferentially from the outermost support rib 916. That is, the first sub-arc segment 917 and the second sub-arc segment 918 are cantilever arms set on both sides of the support rib 916. The ends of the first sub-arc segment 917 and the second sub-arc segment 918 away from the support rib 916 are both free ends. Therefore, the first sub-arc segment 917 and the second sub-arc segment 918 can undergo elastic deformation. Through the elastic deformation of the first sub-arc segment 917 and the second sub-arc segment 918, the curvature of the first arc surface 914 can be changed, and the diameter of the first arc surface 914 can be changed. Therefore, it is easier to assemble the powder metering wheel 9 into the first cylindrical groove 716, avoiding the assembly tolerance between the first arc segment 912 and the first cylindrical groove 716. After the powder metering wheel 9 is assembled into the first cylindrical groove 716, the first arc segment 912 and the inner arc surface 705 of the first cylindrical groove 716 are interference-fitted or tightly fitted, preventing powder leakage from the dosing cup 902.

[0163] Furthermore, such as Figure 17A and Figure 17BAs shown, the first arc segment 912 also includes a third sub-arc segment 919 connecting the first sub-arc segment 917 and the second sub-arc segment 918, that is, the third sub-arc segment 919 is located between the first sub-arc segment 917 and the second sub-arc segment 918. Since the first sub-arc segment 917 and the second sub-arc segment 918 are located on both sides of the support rib 916, and the third sub-arc segment 919 is located between the first sub-arc segment 917 and the second sub-arc segment 918, the third sub-arc segment 919 is located within the area where the support rib 916 is provided. If there is one support rib 916, the third sub-arc segment 919 is the portion of the first arc segment 912 located circumferentially between the two outer surfaces of the support rib 916; if there are multiple support ribs 916, the third sub-arc segment 919 is the portion of the first arc segment 912 located circumferentially between the outer surfaces of the two outermost support ribs 916.

[0164] In some preferred embodiments, the first sub-arc segment 917 and the second sub-arc segment 918 have the same arc length, that is, the first sub-arc segment 917 and the second sub-arc segment 918 are symmetrically arranged about the third sub-arc segment 919, which facilitates uniform deformation of the first sub-arc segment 917 and the second sub-arc segment 918. In other embodiments, the arc lengths of the first sub-arc segment 917 and the second sub-arc segment 918 can also be different, that is, the arc length of the first sub-arc segment 917 can be greater than or less than the arc length of the second sub-arc segment 918. It can be designed as needed, as long as the first sub-arc segment 917 and the second sub-arc segment 918 can undergo elastic deformation.

[0165] like Figure 16A and Figure 16B As shown, in one specific embodiment, a dosing cup 902 is provided on the first arc surface 914. The dosing cup 902 can be provided on the first sub-arc segment 917, the second sub-arc segment 918, or the third sub-arc segment 919. Preferably, the dosing cup 902 is provided on the first sub-arc segment 917 or the second sub-arc segment 918. Since the first sub-arc segment 917 and the second sub-arc segment 918 can undergo elastic deformation in the radial direction of the powder metering wheel 9, it is more conducive to achieving a tight seal between the dosing cup 902 and the inner arc surface 705 of the first cylindrical groove 716, and more effectively preventing powder leakage. In other embodiments, other numbers of dosing cups 902 can also be provided at intervals on the first arc surface 914, and the multiple dosing cups 902 can be randomly distributed on the first arc surface 914.

[0166] Specifically, the number of support ribs 916 can be one or more, depending on the design requirements. In some embodiments, the thickness of the support ribs 916 is in the range of 0.4mm-5mm. This ensures that the elastic deformation capacity of the first sub-arc segment 917 and the second sub-arc segment 918 is not affected, and also guarantees that after the powder metering wheel 9 is assembled into the first cylindrical groove 716, the support ribs 916 can provide strong support for the first arc segment 912, allowing the first arc surface 914 of the first arc segment 912 to fit more closely with the inner arc surface 705 of the first cylindrical groove 716. The thickness of the support rib 916 refers to the distance between the two opposite outer surfaces of the support rib 916 in the circumferential direction of the first arc segment 912.

[0167] like Figure 17A As shown, in some embodiments, there is one support rib 916. In the circumferential direction of the powder metering wheel 9, the two opposite outer surfaces of the first arc segment 912 of the support rib 916 are a first outer surface 920 and a second outer surface 921, respectively. The portion of the first arc segment 912 between the first outer surface 920 and the second outer surface 921 is a third sub-arc segment 919. That is, the arc length of the third sub-arc segment 919 is related to the thickness of the support rib 916. The thickness of the support rib 916 is the distance between the first outer surface 920 and the second outer surface 921. Optionally, when there is only one support rib 916, the support rib 916 is positioned at the center of the first arc surface 914. That is, the first sub-arc segment 917 and the second sub-arc segment 918 have the same arc length and are symmetrically arranged about the support rib 916. This ensures that the deformation of the first sub-arc segment 917 and the second sub-arc segment 918 during elastic deformation in the radial direction of the powder metering wheel 9 can be substantially consistent, thereby facilitating the assembly of the powder metering wheel 9 into the first cylindrical groove 716. In other embodiments, when there is only one support rib 916, the support rib 916 can also be positioned away from the center of the first arc surface 914. That is, the arc lengths of the first sub-arc segment 917 and the second sub-arc segment 918 can be different, as long as the first sub-arc segment 917 and the second sub-arc segment 918 can undergo elastic deformation.

[0168] In other embodiments, there are multiple support ribs 916, which are spaced apart circumferentially along the powder metering wheel 9, such as... Figure 17BAs shown, in one specific embodiment, there are three support ribs 916. Around the powder metering wheel 9, the two outermost support ribs 916 are the first support rib 922 and the second support rib 923, respectively. The surface of the first support rib 922 facing away from the second support rib 923 is the third outer surface 924, and the surface of the second support rib 923 facing away from the first support rib 922 is the fourth outer surface 925. The portion of the first arc segment 912 corresponding to the area between the third outer surface 924 and the fourth outer surface 925 is the third sub-arc segment 919. It should be noted that the two outermost support ribs 916 here refer to the support rib 916 closest to the free end of the first sub-arc segment 917 and the support rib 916 closest to the free end of the second sub-arc segment 918. Preferably, the multiple support ribs 916 are evenly spaced, and the thickness of the multiple support ribs 916 is equal, so that the first sub-arc segment 917 and the second sub-arc segment 918 can undergo more uniform elastic deformation. In other embodiments, the number of support ribs 916 can be any number, such as two, three, or four. Multiple support ribs 916 can be randomly distributed along the circumference of the first arc segment 912, and the thickness of multiple support ribs 916 can also be different, which can be designed as needed.

[0169] Preferably, the number of support ribs 916 is in the range of one to five, to avoid an excessive number of support ribs 916, which would result in the arc length of the first sub-arc segment 917 and the second sub-arc segment 918 being too short, affecting the elastic deformation capacity of the first sub-arc segment 917 and the second sub-arc segment 918, and thus affecting the assembly of the powder metering wheel 9 with the first cylindrical groove 716 of the powder container 7. More preferably, as Figure 16A and Figure 16B As shown, there are two support ribs 916, which facilitates more uniform elastic deformation of the first sub-arc segment 917 and the second sub-arc segment 918, and facilitates better fit and sealing between the first arc surface 914 of the first arc segment 912 and the inner arc surface 705 of the first cylindrical groove 716 after the powder metering wheel 9 is assembled into the first cylindrical groove 716.

[0170] In some embodiments, the first sub-arc segment 917 and the second sub-arc segment 918 have the same arc length, that is, the first sub-arc segment 917 and the second sub-arc segment 918 are symmetrically arranged about the third sub-arc segment 919. The arc length of the third sub-arc segment 919 is 1 / 6 to 1 / 2 of the arc length of the first arc segment 912. Since the first sub-arc segment 917 and the second sub-arc segment 918 have the same arc length, that is, the arc length of the first sub-arc segment 917 and the arc length of the second sub-arc segment 918 are both within the range of 1 / 4 to 5 / 12 of the arc length of the first arc segment 912. It is understandable that, since the third sub-arc segment 919 is connected between the first sub-arc segment 917 and the second sub-arc segment 918, setting the arc length of the third sub-arc segment 919 to 1 / 6 to 1 / 2 of the arc length of the first arc segment 912 makes the third sub-arc segment 919 closer to the center position of the first arc segment 912, ensuring the arc length of the first sub-arc segment 917 and the second sub-arc segment 918, thereby ensuring that the first sub-arc segment 917 and the second sub-arc segment 918 can better achieve elastic deformation, so that the curvature of the first arc surface 914 of the first arc segment 912 can change more, thus making it easier to assemble the powder metering wheel 9 and achieve a tight fit between the first arc surface 914 and the inner arc surface 705 of the first cylindrical groove 716.

[0171] Preferably, the arc length of the third sub-arc segment 919 is 1 / 4 to 1 / 3 of the arc length of the first arc segment 912. That is, the arc lengths of the first sub-arc segment 917 and the second sub-arc segment 918 are both within the range of 1 / 3 to 3 / 8 of the arc length of the first arc segment 912. This makes the third sub-arc segment 919 closer to the center position of the first arc segment 912, and the arc lengths of the first sub-arc segment 917 and the second sub-arc segment 918 are longer, which is more conducive to the first sub-arc segment 917 and the second sub-arc segment 918 achieving better elastic deformation.

[0172] In some embodiments, the support rib 916 is elastic along the radial direction of the powder metering wheel 9, such that the first arc segment 912 is movable in the radial direction of the powder metering wheel 9. That is, in addition to the elastic deformation of the first sub-arc segment 917 and the second sub-arc segment 918 of the first arc segment 912 causing a change in the curvature of the first arc surface 914, the support rib 916 itself can also be elastic. The elastic deformation of the support rib 916 in the radial direction of the powder metering wheel 9 drives the first arc segment 912 to move, thereby changing the distance between the first arc segment 912 and the bearing ring 915. This makes it easier to assemble the powder metering wheel 9 into the first cylindrical groove 716. After the powder metering wheel 9 is assembled into the first cylindrical groove 716, the support rib 916 rebounds in the radial direction of the powder metering wheel 9, which can provide a certain supporting and tightening effect on the first arc segment 912, further making the first arc surface 914 of the first arc segment 912 fit more tightly with the inner arc surface 705 of the first cylindrical groove 716.

[0173] like Figure 16A and Figure 16B As shown, the second arc segment 913 of the powder metering wheel 9 has a second arc surface 926. In some embodiments, when both the first arc segment 912 and the second arc segment 913 are in a non-deformed state, the diameter of the first arc surface 914 is larger than the diameter of the second arc surface 926. Furthermore, when the second arc segment 913 is in a non-deformed state, the diameter of the second arc surface 926 is smaller than the diameter of the inner arc surface 705 of the first cylindrical groove 716, so as to ensure that the powder metering wheel 9 can be smoothly assembled into the first cylindrical groove 716 of the powder container 7, and to reduce the machining accuracy requirements of the second arc segment 913. It can be understood that the second arc segment 913 does not need to be deformed before and after being assembled into the first cylindrical groove 716. Preferably, when both the first arc segment 912 and the second arc segment 913 are in a non-deformed state, the difference between the diameter of the first arc surface 914 and the diameter of the second arc surface 926 is greater than or equal to 0.4 mm and less than or equal to 5 mm. This is more conducive to improving the assembly efficiency of the powder metering wheel 9 and the uniqueness of the fit between the first arc surface 914 and the inner arc surface 705 of the first cylindrical groove 716. At the same time, it can also ensure that the powder metering wheel 9 can achieve smooth reciprocating rotation in the first cylindrical groove 716.

[0174] In other embodiments, the second arc segment 913 may also be configured to be elastically deformable in the radial direction of the powder metering wheel 9, so that during the process of assembling the powder metering wheel 9 into the first cylindrical groove 716 of the powder container 7, the diameter of the second arc surface 926 is reduced by the elastic deformation of the second arc segment 913 in the radial direction of the powder metering wheel 9, so as to further improve the assembly efficiency of the powder metering wheel 9.

[0175] In some embodiments, the first arc segment 912 and the second arc segment 913 of the powder metering wheel 9 can be integrally formed. The powder metering wheel 9 can be made of materials such as resin, which can ensure the structural strength of the powder metering wheel 9 and avoid the powder metering wheel 9 being too heavy, thus affecting the smoothness of the powder metering wheel 9's reciprocating rotation in the first cylindrical groove 716.

[0176] In some implementations, such as Figure 16A and Figure 16BAs shown, the bearing ring 915 has a first end and a second end that are opposite each other along the axial direction of the powder metering wheel 9. A first clamping spring arm 909 can be provided at the first end of the bearing ring 915. The first clamping spring arm 909 is located around the second central hole 906 formed by the bearing ring 915. The first clamping spring arm 909 of the powder metering wheel 9 is configured to cooperate with the second cylinder 703 in the first cylindrical groove 716 of the powder container 7. Specifically, the second cylinder 703 in the first cylindrical groove 716 is assembled in the second central hole 906. The first clamping spring arm 909 abuts against the second cylinder 703 in the first cylindrical groove 716. The inner diameter of the first clamping spring arm 909 is smaller than the outer diameter of the second cylinder 703. Therefore, during assembly, the first clamping spring arm 909 undergoes elastic deformation. The elastic deformation of the first clamping spring arm 909 of the powder metering wheel 9 provides a clamping force for the fit between the inner arc surface 705 of the first cylindrical groove 716 and the first arc surface 914 of the powder metering wheel 9, thereby improving the sealing reliability of the first arc surface 914 and the inner arc surface 705 of the first cylindrical groove 716 and further helping to prevent powder leakage in the dosing cup 902.

[0177] In this embodiment, the first boss 905, groove 911, drive spring arm 910 and other structures of the powder metering wheel 9 can all refer to the structure in the first embodiment of the powder metering wheel 9, and can achieve the same or similar technical effects, which will not be described in detail here.

[0178] In other embodiments, along the circumference of the powder metering wheel 9, the powder metering wheel 9 may include other number of arc segments spaced apart from each other. That is, it may include not only the first arc segment 912 and the second arc segment 913, but may also divide the powder metering wheel 9 into multiple segments along the circumference of the powder metering wheel 9. The specific design can be made as needed, as long as the first arc segment 912 on which the dosing cup 902 is provided can undergo elastic deformation in the radial direction of the powder metering wheel 9, and the dosing cup 902 can be tightly fitted and sealed by the inner arc surface 705 of the first cylindrical groove 716 of the powder container 7.

[0179] In a preferred embodiment, during the opening process, the outer cover 4 is at an angle of 150° in the second position. During the rotation of the outer cover 4 from the first position (i.e., 0°) to the second position, specifically during the rotation from 0° to 62.5° (i.e., the outer cover 4 rotates 62.5°), the outer cover 4 drives the drive gear 5 to rotate, which in turn drives the drive cam 12 to rotate from 0° to 75° (i.e., the drive cam 12 rotates 75°). During this process, the powder metering wheel 9 is stationary, and the first boss 905 of the powder metering wheel 9 does not contact the annular boss 1207 of the drive cam 12. The powder metering wheel 9 does not rotate in the third position. During the rotation of the outer cover 4 from 62.5° to 150° (i.e., the first boss 905 of the powder metering wheel 9 does not contact the annular boss 1207 of the drive cam 12), the powder metering wheel 9 does not rotate. The outer cover 4 rotates 87.5°, which drives the drive gear 5 to rotate, thereby driving the drive cam 12 to rotate from 75° to 180° (i.e., the drive cam 12 rotates 105°). During this process, the first boss 905 of the powder metering wheel 9 contacts the annular boss 1207 of the drive cam 12. The annular boss 1207 of the drive cam 12 cooperates with the first boss 905 of the powder metering wheel 9, driving the powder metering wheel 9 to rotate from the third position to the fourth position. During this process, the powder metering wheel 9 rotates 105°, that is, when the dosage cup 902 of the powder metering wheel 9 rotates from the powder outlet 713 position to the inlet 704 position of the suction channel 706, the rotation angle of the powder metering wheel 9 is 105°.

[0180] During the rotation of the outer cover 4 from 62.5° to 150°, the drive cam 12 rotates from 75° to 180°, driving the powder metering wheel 9 to rotate from the third position to the fourth position. That is, the dosing cup 902 of the powder metering wheel 9 rotates from the powder outlet 713 position of the powder container 7 to the inlet 704 position of the suction channel 706. During this process, the powder delivery mechanism realizes the powder delivery process. During the opening of the outer cover 4, the second opening load stroke is carried out within this rotation range, which requires a large torque. The torque of the outer cover 4 is constant in the second opening load stroke. Preferably, the torque of the outer cover 4 in the second opening load stroke is 0.1 N·m, which ensures that the outer cover 4 opens at a uniform speed and smoothly without sudden torque changes until the opening is completed, thereby ensuring the powder delivery effect and avoiding powder leakage or waste.

[0181] The outer cover 4 is linked to the powder metering wheel 9 and the air compression mechanism. When the outer cover 4 is configured in the first position, it confines the airbag pressure member 17 to the fifth position. During the process of the outer cover 4 rotating from the first position to the second position, the confinement of the airbag pressure member 17 is first released, so that the elastic member 19 drives the airbag pressure member 17 to move from the fifth position to the sixth position, and then drives the powder metering wheel 9 to rotate from the third position to the fourth position. During the process of the outer cover 4 reversing and resetting from the second position to the first position, it drives the powder metering wheel 9 to reverse and reset from the fourth position to the third position, and drives the airbag pressure member 17 to move in the opposite direction from the sixth position to reset to the fifth position.

[0182] After the powder delivery mechanism completes the powder delivery process, the outer cover 4 rotates to the second position, and the dosing cup 902 of the powder metering wheel 9 of the powder delivery mechanism is in the position corresponding to the inlet 704 of the inhalation channel 706. The outer cover 4 is fully opened and the outlet 102 of the mouthpiece 101 is exposed. The user can inhale at the outlet 102 of the mouthpiece 101, which facilitates the activation of the inhalation triggering mechanism to achieve the inhalation triggering function.

[0183] See Figures 18A to 26B , Figure 18A yes Figure 1 A schematic diagram of the inhalation trigger device of the provided powder inhaler when it is in a certain state on the powder container. Figure 18B yes Figure 18A A schematic diagram of the provided suction triggering device in another state on the powder container. Figure 19A yes Figure 18A A schematic diagram of the provided suction trigger device after removing the powder container. Figure 19B yes Figure 18B A schematic diagram of the provided suction trigger device after removing the powder container. Figure 20A yes Figure 19A A schematic diagram of the provided inhalation triggering device from another angle. Figure 20B yes Figure 19B A schematic diagram of the provided inhalation triggering device from another angle. Figure 21A yes Figure 1 An exploded view of the counting mechanism of the provided powder inhaler. Figure 21B yes Figure 21A The provided assembly structure diagram of the counting mechanism, Figure 22A yes Figure 21A A schematic diagram of the counter base of the provided counting mechanism at an angle. Figure 22B yes Figure 21A A schematic diagram of the counter base from another angle is provided. Figure 23 yes Figure 1 A schematic diagram of the dosage protection plate of the inhalation trigger device for the provided powder inhaler. Figure 24A yes Figure 1 A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in one state. Figure 24B yes Figure 1 A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in another state. Figure 24C yes Figure 24A A partially enlarged schematic diagram, Figure 24D yes Figure 24B A partially enlarged schematic diagram, Figure 24E yes Figure 1A schematic diagram of the assembly cross-section of the powder metering wheel and dosage protection plate of the provided powder inhaler in another state. Figure 24F yes Figure 24E A partially enlarged schematic diagram, Figure 25A yes Figure 1 A schematic diagram of the air intake baffle of the inhalation trigger device of the provided powder inhaler at an angle. Figure 25B yes Figure 25A A structural diagram of the provided air intake baffle from another angle. Figure 25C yes Figure 25A The provided schematic diagram shows the structure of the air intake baffle at another angle. Figure 26A yes Figure 1 A schematic diagram of the front housing of the provided powder inhaler at an angle. Figure 26B yes Figure 1 A schematic diagram of the front housing of the provided powder inhaler from another angle.

[0184] (3) Inhalation trigger mechanism

[0185] See Figures 18A to 26B The inhalation triggering mechanism includes an air intake baffle 11 and a dose protection plate 10. The dose protection plate 10 includes a shielding part 1004. The air intake baffle 11 and the dose protection plate 10 are linked and cooperate with each other. The powder inhaler also includes a reset torsion spring 15 and a drive torsion spring 16. The air intake baffle 11 and the dose protection plate 10 of the inhalation triggering mechanism, together with the reset torsion spring 15, the drive torsion spring 16, the powder container 7, the powder metering wheel 9, and the drive cam 12, jointly realize the inhalation triggering function.

[0186] See Figure 13A and Figure 13B The powder container 7 also has an airflow channel 708 connected to the suction channel 706, through which the suction channel 706 needs to communicate with the outside atmosphere. See [link to other documentation] Figures 13A to 20BWhen the inhalation trigger mechanism is in its initial state, the air intake baffle 11 blocks the airflow channel 708, preventing the airflow channel 708 from communicating with the outside atmosphere. The shielding part 1004 of the dose protection plate 10 blocks the powder outlet of the dose cup 902 located at the inlet 704 of the inhalation channel 706. At this time, the inhalation channel 706 cannot communicate with the outside atmosphere through the airflow channel 708. When the negative pressure inside the inhalation channel 706 exceeds the threshold, i.e., when the user's inhalation flow rate exceeds the working threshold, the inhalation trigger mechanism is activated. Specifically, the air intake baffle 11 rotates and opens the airflow channel 708, connecting the airflow channel 708 with the outside atmosphere. The inhalation channel 706 communicates with the outside atmosphere through the airflow channel 708. The air intake baffle 11 triggers the dose protection plate 10 to rotate, causing the shielding part 1004 of the dose protection plate 10 to deviate from and no longer block the powder outlet of the dose cup 902, exposing the powder outlet of the dose cup 902 at the inlet 704 of the inhalation channel 706. The working threshold can be in the range of 15L / min to 35L / min, and preferably, the working threshold for triggering the inhalation trigger mechanism is in the range of 20L / min to 25L / min.

[0187] It is understandable that an inhalation trigger mechanism is set in the powder inhaler. Only when the user's inhalation flow rate is higher than the working threshold will the air intake baffle 11 rotate and open the airflow channel 708, so that the inhalation channel 706 is connected to the outside atmosphere through the airflow channel 708. The rotation of the air intake baffle 11 will trigger the rotation of the dose protection plate 10 to avoid blocking the powder outlet of the dose cup 902, so that the powder outlet of the dose cup 902 is connected to the inhalation channel 706. The powder in the dose cup 902 is exposed and carried out and deagglomerated by the airflow in the inhalation channel 706. At this time, the airflow velocity is high and the deagglomeration effect is good. This realizes the flow rate threshold control of powder release, improves the deagglomeration effect of powder release, and avoids powder waste.

[0188] See Figure 13B , Figures 18A to 25C The air intake port of the airflow channel 708 has a mounting hole 707 on its side wall, and the air intake baffle 11 can be rotatably mounted on the mounting hole 707. The side wall of the airflow channel 708 is surrounded by the air intake baffle 11.

[0189] Specifically, the intake baffle 11 includes a baffle body 1110, which is rotatably connected to the side wall of the airflow channel 708. In one embodiment, the intake baffle 11 further includes a rotating shaft 1106, which is disposed at the first end of the baffle body 1110 and passes through a mounting hole 707 on the side wall of the port of the airflow channel 708 and is rotatably connected to the mounting hole 707.

[0190] See Figure 9G , Figure 9H , Figures 13A to 25CThe first surface of the baffle body 1110 has a second protrusion 1101. The first surface is the surface of the baffle body 1110 facing the port of the airflow channel 708. The second protrusion 1101 is used to increase the complexity of the side flow channel. Specifically, the second protrusion 1101 protruding from the outer surface of the baffle body 1110 changes the side flow channel from direct flow to an "L"-shaped flow channel, thereby increasing the flow resistance of the airflow and achieving a lower trigger flow velocity under the same airflow area. This makes it easier to achieve the inhalation trigger function, which is beneficial for users with weak constitutions to use the powder inhalation device. The "L"-shaped flow channel refers to the flow channel including a bent first flow channel section and a second flow channel section. The included angle between the first flow channel section and the second flow channel section can be 80°-100°, for example, 90°, which will be described in detail later.

[0191] The outer surface of the baffle body 1110 in this application is defined relative to the port of the airflow channel 708; the surface facing outward from the port of the airflow channel 708 is defined as the outer surface. The second protrusion 1101 can be directly formed by protruding from the outer surface of the baffle body 1110, for example, the baffle body 1110 may be a solid structure. Alternatively, the second protrusion 1101 can be formed by recessing from the baffle body 1110, i.e., by bending a portion of the baffle body 1110 outward towards the port of the airflow channel 708 to form the second protrusion 1101. This makes the baffle body 1110 merely a frame, reducing the weight of the intake baffle 11. The second protrusion 1101 can be integrally formed with the baffle body 1110, or it can be directly connected and fixed to the outer surface of the baffle body 1110 to form the second protrusion 1101.

[0192] In one embodiment, the second protrusion 1101 covers the central region of the surface of the baffle body 1110 facing the port of the airflow channel 708. The projection of the second protrusion 1101 onto the baffle body 1110 is similar in shape to the baffle body 1110, and the projection of the second protrusion 1101 onto the baffle body 1110 covers more than 60% of the area of ​​the baffle body 1110. This further increases the flow resistance of the side flow channel, ensures the consistency of the inhalation resistance at each stage of the powder inhaler's drug delivery process, improves the drug delivery effect of the powder inhaler, and thus enhances user compliance, providing a better user experience. The area of ​​the baffle body 1110 covered by the projection of the second protrusion 1101 onto the baffle body 1110 is related to the width of the annular surface 1109 and can be designed as needed.

[0193] In other embodiments, the second protrusion 1101 covers other areas of the surface of the baffle body 1110 facing the port of the airflow channel 708. The second protrusion 1101 can also be configured in other shapes. The ratio of the projected area of ​​the second protrusion 1101 on the baffle body 1110 to the area of ​​the baffle body 1110 can also be configured to other values, as long as the second protrusion 1101 can increase the complexity of the side flow channel and improve the flow resistance of the airflow.

[0194] In one embodiment, along the direction from the first end of the baffle body 1110 to the opposite second end (away from the pivot 1106), the height of the second protrusion 1101 gradually decreases, so that the top surface of the second protrusion 1101 forms an inclined surface. The inclined surface has a certain guiding effect, which facilitates the direction of airflow and makes it easier to realize the inhalation trigger function.

[0195] For details, see Figure 9G , Figure 9H , Figure 18A , Figure 18B and Figures 25A to 26B The front housing 1 has a mouthpiece 101, which is positioned and connected to the suction channel 706. The side wall of the front housing 1 has an air inlet 104 and a grille 103. The grille protrudes from the outer wall of the front housing 1. The air inlet 104 connects to the outside atmosphere and the space inside the housing assembly. In one specific embodiment, the grille 103 is positioned above the mouthpiece 101 and adjacent to the air inlet 104. The grille 103 protrudes from the outer wall of the front housing 1 to prevent the lips from contacting the air inlet 104 and blocking it when the user inhales powder from the mouthpiece 101, thus preventing poor airflow or the inability of outside air to enter the housing assembly through the inlet 109. Figure 26B As shown, in a preferred embodiment, the side wall of the front housing 1 is provided with three air inlets 104 and two grilles 103, with the grilles 103 and air inlets 104 alternating. In other embodiments, the air inlets 104 and grilles 103 may be located in other positions, and may be provided in any number of other locations.

[0196] like Figure 25C As shown, along the circumference of the second protrusion 1101, the outer peripheral side of the second protrusion 1101 and the outer peripheral side of the baffle body 1110 are evenly spaced. The portion of the surface of the baffle body 1110 facing the port of the airflow channel 708 that is not covered by the second protrusion 1101 forms an annular surface 1109. Both the annular surface 1109 and the outer peripheral side of the second protrusion 1101 are used to cooperate with the front housing 1 of the powder inhaler to form an L-shaped airflow channel. Specifically, as... Figure 26A and Figure 26BAs shown, the inner wall of the front housing 1 is provided with an annular flange 111, which surrounds the air intake 104. Specifically, the annular flange 111 surrounds three air intakes 104 and two grilles 103. See also Figures 9C to 9H One end of the annular flange 111 is disposed within the airflow channel 708, and the side wall of the front housing 1 blocks the port of the airflow channel 708. When the intake trigger mechanism is in the initial state, the inner peripheral side of the annular flange 111 of the front housing 1 is spaced apart from and cooperates with the outer peripheral side of the second protrusion 1101 of the intake baffle 11 to form a first flow channel section. The end face of the annular flange 111 away from the front housing 1 abuts against and cooperates with the annular surface 1109 of the intake baffle 11 to form a second flow channel section. The first flow channel section and the second flow channel section are interconnected to form an L-shaped intake airflow channel Q1. Before the inhalation triggering mechanism is triggered, outside air enters the internal space of the housing assembly through the air inlet 104 on the front housing 1. The L-shaped air inlet channel Q1 formed by the baffle body 1110 of the air inlet baffle 11, the second protrusion 1101 and the annular flange 111 of the front housing 1 allows outside air to enter the powder inhaler, ensuring the consistency of the inhalation resistance at each stage of the powder inhaler during the drug delivery process. This avoids the inhalation resistance inside the powder inhaler being too high before the inhalation triggering, which would affect the compression process or the powder delivery process, and improve the drug delivery effect of the powder inhaler.

[0197] When the user inhales through the nozzle 101, and the negative pressure inside the inhalation channel 706 is greater than the threshold, that is, when the airflow velocity during the user's inhalation is greater than the working threshold, the internal negative pressure will push the intake baffle 11 to rotate and open the airflow channel 708. The airflow channel 708 is connected to the outside atmosphere through the air intake 104.

[0198] like Figure 9G and Figure 9H As shown, the distance between the top surface of the second protrusion 1101 of the intake baffle 11 and the surface of the baffle body 1110 facing the port of the airflow channel 708 is the first distance L1, that is, the height of the second protrusion 1101 is L1, and the thickness of the annular flange 111 on the inner wall of the front housing 1 is the second distance L2. The ratio between the first distance L1 and the second distance L2 is 1:2-7:1. Preferably, the first distance L1 is greater than the second distance L2, and the ratio between the first distance L1 and the second distance L2 is 1:1-5:1. By setting the ratio between the first distance L1 and the second distance L2 within the aforementioned range, the pressure difference between the inner and outer sides of the intake baffle 11 can be increased. That is, the pressure difference between the side of the intake baffle 11 near the airflow channel 708 and the side of the intake baffle 11 near the air inlet 104 of the front housing 1 can be increased, thereby increasing other resistances. The increased pressure difference between the two sides of the intake baffle 11 can more easily push the intake baffle 11 to rotate and open the airflow channel 708, thus making it easier to realize the intake trigger function.

[0199] In one embodiment, the intake baffle 11 further includes a rotating member 1108. A rotating shaft 1106 is disposed at one end of the baffle body 1110. The rotating member 1108 is connected to the free end of the rotating shaft 1106 and is spaced apart from the baffle body 1110. The first end of the rotating member 1108 has a curved surface, which faces the outside of the port of the airflow channel 708 (specifically, the line connecting the two ends of the curved surface is basically parallel to the baffle body 1110). Specifically, the curved surface can be an arc-shaped surface. The curved surface is used to guide the airflow so that the airflow path lengths on both sides of the baffle body 1110 are consistent.

[0200] For details, see Figure 9C , Figure 13A , Figure 13B , Figure 18A and Figure 18B The sidewall of the airflow channel 708 of the powder container 7 is connected to the sidewall of the storage cavity 715. At one end of the sidewall of the airflow channel 708 connected to the sidewall of the storage cavity 715, there are mutually spaced first guide holes 710 and second guide holes 717. At one end of the suction channel 706 near the nozzle 101, there are mutually spaced first airflow inlets 718 and second airflow inlets 719. The first guide hole 710 connects the airflow channel 708 and the first airflow inlet 718, and the second guide hole 717 connects the airflow channel 708 and the second airflow inlet 719. The inner wall surface of the front housing 1 and the outer wall surface of the suction channel 706 are spaced apart to form a guide channel 720 (e.g., ...). Figure 9C The guide channel 720 connects the airflow channel 708 with the first airflow inlet 718 and the second airflow inlet 719. (See also...) Figure 18BWhen the airflow velocity of the user's inhalation is greater than the working threshold and the negative pressure inside the inhalation channel 706 is greater than the threshold, the intake baffle 11 rotates and opens the airflow channel 708. The air inlet 104 on the front housing 1 passes through the airflow channel 708 to the first guide hole 710 and the second guide hole 717. After the outside air enters the housing assembly through the air inlet 104 of the front housing 1, part of the gas flows to the first guide hole 710 through the airflow channel 708, part of the gas flows to the second guide hole 717 through the airflow channel 708, and the remaining gas flows to the guide channel 720 through the airflow channel 708. In this configuration, the gas exiting the first guide hole 710 flows along the outer side of the sidewall of the airflow channel 708 to the second curved surface 1104 and finally flows to the first airflow inlet 718. The gas exiting the second guide hole 717 flows along the outer side of the sidewall of the airflow channel 708 to the first curved surface 1103 and finally flows to the second airflow inlet 719. The gas exiting the guide channel 720 can simultaneously enter the first airflow inlet 718 and the second airflow inlet 719, facilitating the absorption of powder through the suction channel 706. It can be understood that by setting three air inlets 104 in the front housing 1, and respectively providing the first guide hole 710, the second guide hole 717, and the guide channel 720, the ventilation cross-section of the three airflow paths can be made consistent with the ventilation cross-sectional area of ​​the three air inlets 104 in the front housing 1, avoiding gas loss during intake. Simultaneously, the first curved surface 1103 and the second curved surface 1104 are both arc-shaped surfaces, which can guide the airflow direction, ensuring that the lengths of the airflow paths on both sides of the baffle body 1110 are consistent.

[0201] In one implementation, such as Figure 13B and Figure 18B As shown, the inhalation channel 706 has two opposing arc-shaped ribs inside. These two ribs, together with the sidewall of the inhalation channel 706, form a vortex-like airflow channel. Gas enters the inhalation channel 706 through the first airflow inlet 718 and the second airflow inlet 719, forming a vortex. The vortex carries the powdered medicine from the dosing cup 902 at the inlet 704 of the inhalation channel 706 into the inhalation channel 706. After deagglomeration in the inhalation channel 706, the powder finally flows to the mouthpiece 101 and is inhaled by the user. This design is more conducive to the deagglomeration of powdered medicines in the inhalation channel 706, avoiding powder waste and improving powder utilization.

[0202] See Figures 25A to 25CThe second end of the rotating member 1108 has a raised third cylinder 1102 on its surface away from the baffle body 1110. The third cylinder 1102 is used to abut against the drive arm of the reset torsion spring 15 of the powder inhaler, so that the baffle body 1110 fits against the front housing 1. Specifically, in one embodiment, there are two rotating shafts 1106, which are respectively disposed on opposite sides of the baffle body 1110, and are defined as the first rotating shaft 1106a and the second rotating shaft 1106b. There are also two rotating members 1108, which are defined as the first rotating member 1108a and the second rotating member 1108b. The first rotating member 1108a is connected to the free end of the first rotating shaft 1106a. The first end of the first rotating member 1108a has a first curved surface 1103, and the second end has a raised third cylinder 1102 on its surface away from the baffle body 1110. The second rotating member 1108b is connected to the free end of the second rotating shaft 1106b. The first end of the second rotating member 1108b has a second curved surface 1104, and the second end has an arc groove surface 1107.

[0203] In one embodiment, the side of the baffle body 1110 also has a shoulder 1105 surrounding the rotating shaft 1106. The shoulder 1105 is spaced apart from the rotating member 1108. The shoulder 1105 is used to keep the gap between the two sides of the baffle body 1110 and the side wall of the airflow channel 708 uniform, so as to facilitate a more stable implementation of the intake trigger function.

[0204] See Figure 13A and Figure 13B , Figures 18A to 25C The powder container 7 also has a second cylindrical groove 712, which is coaxially and opposite to the first cylindrical groove 716 and has a common bottom wall (not shown in the figure). The counting mechanism and the dose protection plate 10 are installed in the second cylindrical groove 712. See also Figures 18A to 22B The counting mechanism includes a counter base 21, which has a cylindrical shaft 2111. Both the dose protection plate 10 and the counter base 21 of the counting mechanism are installed in the second cylindrical groove 712 on the powder container 7. The counter base 21 axially limits the dose protection plate 10. The powder inhaler also includes a drive torsion spring 16 and a return torsion spring 15. The drive torsion spring 16 is fitted on the cylindrical shaft 2111 of the counter base 21. The counter base 21 is provided with a limiting groove 2109. The fixing arm of the drive torsion spring 16 is fixed by the limiting groove 2109 on the counter base 21. The return torsion spring 15 is installed on the gear bracket 14.

[0205] See Figures 18A to 23The dose protection plate 10 includes an annular body 1000, a shielding portion 1004, and a clamping member 1006. The clamping member 1006 is disposed on the outer side of the annular body 1000. The shielding portion 1004 is connected to one end of the annular body 1000 and is spaced apart from the clamping member 1006. The shielding portion 1004 is used to shield or not shield the dose cup 902. The annular body 1000 is disposed in the second cylindrical groove 712 of the powder container 7. Figure 21B As shown, the annular body 1000 is used to accommodate the counting mechanism. The side wall of the second cylindrical groove 712 of the powder container 7 has a notch, and the clamping member 1006 extends out of the second cylindrical groove 712 through the notch and can rotate back and forth within the notch. Figure 23 As shown, the surface of the clamping member 1006 away from the annular body 1000 includes a clamping arc surface 1002. When the inhalation triggering mechanism is in the initial state, that is, before it is triggered or after the inhalation triggering mechanism is reset, the arc groove surface 1107 of the rotating member 1108 of the inhalation baffle 11 cooperates with the clamping arc surface 1002 of the dose protection plate 10 to achieve concentric arc surface clamping.

[0206] The shielding part 1004 is connected to one end of the annular body 1000 and is used to shield or not shield the dosing cup 902, such as Figure 13B As shown, the powder container 7 has an arc-shaped notch (not shown) on its common bottom wall, allowing the blocking part 1004 of the dose protection plate 10 to pass through the arc-shaped notch and enter the first cylindrical groove 716. It can rotate back and forth within the arc-shaped notch to be located at the entrance 704 of the inhalation channel 706 before the inhalation triggering mechanism is triggered, thus blocking the dose cup 902 at that position. After the inhalation triggering mechanism is triggered, it rotates within the arc-shaped notch away from the entrance 704 of the inhalation channel 706 so as not to block the dose cup 902, thereby exposing the powder inside the dose cup 902 for easy inhalation.

[0207] For details, see Figures 18A to 20B , Figure 23 The clamping member 1006 includes a cylindrical convex surface 1001, which is disposed on one side of the clamping arc surface 1002, such as... Figure 19A and Figure 19B As shown, the drive arm of the drive torsion spring 16 of the powder inhaler acts on the cylindrical convex surface 1001 so that when the user's inhalation airflow rate is higher than the working threshold and the air intake baffle 11 rotates, the pressing arc surface 1002 of the dose protection plate 10 disengages from the arc groove surface 1107 of the air intake baffle 11. Under the action of the drive arm of the drive torsion spring 16, the dose protection plate 10 rotates so that the blocking part 1004 of the dose protection plate 10 changes from blocking the dose cup 902 of the powder metering wheel 9 to not blocking, so that the powder in the dose cup 902 of the powder metering wheel 9 is exposed to the airflow for inhalation by the user.

[0208] The following section describes in detail the movement of the inhalation trigger mechanism during the inhalation triggering process.

[0209] See Figure 9D , Figures 18A to 25C Before the outer cover is fully opened, such as Figure 18A , Figure 19A , Figure 20A and Figure 25A As shown, the drive arm of the return torsion spring 15 acts on the third cylinder 1102 of the intake baffle 11. The drive arm of the return torsion spring 15 presses against the intake baffle 11 against the front housing 1. The second boss 1101 is embedded in the annular flange 111. The intake baffle 11 does not rotate, and the intake passage 706 cannot communicate with the outside atmosphere through the airflow passage 708. Figure 23 and Figure 18A As shown, the driving arm of the driving torsion spring 16 acts on the cylindrical convex surface 1001 of the clamping member 1006 of the dose protection plate 10. At this time, the clamping arc surface 1002 of the clamping member 1006 of the dose protection plate 10 acts on the arc groove surface 1107 of the rotating member 1108 of the air intake baffle 11 (as shown). Figure 19A This achieves concentric arc surface compression.

[0210] The guide groove 1209 of the drive cam 12 is located on the surface of the body 1200 facing the gear 1203. The surface of the body 1200 facing away from the gear 1203 has a rib 1208. When the outer cover 4 is opened to the correct position, that is, after the outer cover 4 is rotated to the second position, the rib 1208 of the drive cam 12 will press the drive arm of the return torsion spring 15 away from the third cylinder 1102 of the intake baffle 11 (e.g., Figure 20B When the rib 1208 releases the limit of the return torsion spring 15 on the intake baffle 11 of the inhalation trigger mechanism, the intake baffle 11 is no longer subject to the tightening force of the return torsion spring 15, and only the pressing friction of the pressing arc surface 1002 of the dose protection plate 10 on the arc groove surface 1107 of the intake baffle 11 remains. At the same time, after the outer cover 4 rotates to the second position, the dose cup 902 of the powder metering wheel 9 is delivered to the inlet 704 position of the inhalation channel 706, and the blocking part 1004 of the dose protection plate 10 is located at the inlet 704 position of the inhalation channel 706 and blocks the powder outlet of the dose cup 902.

[0211] After the outer cover 4 is fully open and before the inhalation trigger mechanism is activated, only the pressing friction of the pressure arc surface 1002 of the dose protection plate 10 on the arc groove surface 1107 of the inhalation baffle 11 remains, and the inhalation baffle 11 does not rotate. When the user inhales and the inhalation airflow velocity is greater than the working threshold, and the negative pressure in the inhalation channel 706 is greater than the threshold, the airflow thrust generated by the inhalation airflow acts on the inhalation baffle 11, overcoming the friction of the pressure arc surface 1002 on the arc groove surface 1107, and the inhalation trigger mechanism is activated, causing the inhalation baffle 11 to oscillate and rotate. After the inhalation baffle 11 rotates, the arc groove surface 1107 of the inhalation baffle 11 rotates synchronously, and the pressure arc surface 1002 of the dose protection plate 10 disengages from the arc groove surface 1107 of the inhalation baffle 11 (e.g., Figure 19B Under the driving force of the driving torsion spring 16, the dosage protection plate 10 rotates, and the blocking part 1004 of the dosage protection plate 10 rotates synchronously within the arc-shaped notch, so that the blocking part 1004 of the dosage protection plate 10 deviates from and does not block the powder outlet of the dosage cup 902. At this time, the powder outlet of the dosage cup 902 of the powder metering wheel 9 is exposed in the inhalation channel 706. Under the action of the user's inhalation airflow, the powder in the dosage cup 902 flows through the inhalation channel 706 and the nozzle 101 and is inhaled by the user. In a preferred embodiment, the dosage protection plate 10 rotates downward by 38° under the driving force of the driving torsion spring 16, so that the powder outlet of the dosage cup 902 is connected to the inhalation channel 706, and the powder in the dosage cup 902 is exposed to the airflow and carried away.

[0212] See Figure 14B and Figure 23 The dose protection plate 10 also includes a wedge-shaped post 1005. One end of the wedge-shaped post 1005 is connected to the annular body 1000 and is spaced apart from the shielding part 1004 and the clamping member 1006. The other end of the wedge-shaped post 1005 is used to cooperate with the drive spring arm 910 of the powder metering wheel 9, so that during the closing process of the outer cover 4, the drive spring arm 910 drives the dose protection plate 10 to rotate and reset via the wedge-shaped post 1005. The specific process and method of the drive spring arm 910 driving the dose protection plate 10 to rotate and reset via the wedge-shaped post 1005 will be described in detail in the subsequent process of resetting the outer cover 4 closing trigger function mechanism, and will not be explained in detail here.

[0213] See Figure 23 The dose protection plate 10 also includes a spring arm hook 1003. One end of the spring arm hook 1003 is connected to the annular body 1000. Specifically, one end of the spring arm hook 1003 is connected to the inner wall surface of the annular body 1000, and the other end of the spring arm hook 1003 is used to drive the counting mechanism. The counting mechanism and the counting method and process of the spring arm hook 1003 driving the counting mechanism are described in detail below.

[0214] See Figures 27A to 28 , Figure 27A yes Figure 21A The provided schematic diagram shows the structure of the units digit wheel of the counting mechanism at an angle. Figure 27B yes Figure 27A The provided diagram shows the structure of the units digit wheel from another angle. Figure 28 yes Figure 21A A schematic diagram of the ten-digit wheel of the provided counting mechanism.

[0215] (4) Counting mechanism

[0216] See Figure 21A , Figure 21B , Figures 25A to 28 The counting mechanism includes a counter base 21, a tens digit wheel 22, a units digit wheel 23, and a counter intermediate gear 24. The counting mechanism, in conjunction with the dosage protection plate 10 and the powder container 7, performs the counting function. Specifically, the tens digit wheel 22 is mounted on the counter base 21. The counter base 21 has a cylindrical surface 2101, a spring-loaded latch 2102, and an outer arc-shaped boss 2108. The tens digit wheel 22 has an inner ring 2203 and an inner arc-shaped boss 2205. The cylindrical surface 2101 of the counter base 21 and the inner ring 2203 of the tens digit wheel 22 cooperate to achieve coaxial rotation. The spring-loaded latch 2102 on the counter base 21 axially limits the tens digit wheel 22. The outer arc-shaped boss 2108 of the counter base 21 and the inner arc-shaped boss 2205 of the tens digit wheel 22 cooperate to limit the rotation of the tens digit wheel 22.

[0217] See Figure 4 and Figure 28 The housing assembly is provided with a digital display window 201. Specifically, the rear housing 2 of the housing assembly is provided with a digital display window 201. The tens digit wheel 22 also has a full red warning feature 2201. When the full red warning feature 2201 of the tens digit wheel 22 is displayed in the digital display window 201 on the rear housing 2, the tens digit wheel 22 is limited and no longer rotates.

[0218] The counter base 21 is also provided with a first mounting hole 2103. The counter intermediate gear 24 is installed in the first mounting hole 2103 on the counter base 21. The counter intermediate gear 24 achieves transmission by meshing with the gear features of the tens digit wheel 22 through gear features.

[0219] The units digit wheel 23 has a second mounting hole 2303 and a toothed pin 2301. The counter base 21 is provided with a locking pin 2105. The second mounting hole 2303 on the units digit wheel 23 cooperates with the locking pin 2105 on the counter base 21 to achieve coaxial installation and axial positioning. The units digit wheel 23 has an annular guide structure 2305 for installation with the tens digit wheel 22. The outer peripheral side of the units digit wheel 23 is printed with a first digit 2302, and the outer peripheral side of the tens digit wheel 22 is printed with a second digit 2202 for counting purposes. The toothed pin 2301 on the units digit wheel 23 engages with the intermediate gear 24 of the counter. When the units digit wheel 23 completes one revolution and is transitioning from the number "0" to the number "9", the toothed pin 2301 of the units digit wheel 23 drives the intermediate gear 24 of the counter to rotate two teeth. At the same time, the tens digit wheel 22 meshes with the intermediate gear 24 of the counter, and the tens digit wheel 22 rotates two teeth synchronously to achieve a number transition.

[0220] See Figures 19A to 23 The unit digit wheel 23 is driven by the reciprocating motion of the dose protection plate 10. Specifically, as... Figure 27A As shown, the units digit wheel 23 is equipped with a ratchet 2304, see [reference]. Figure 23 The dose protection plate 10 has a spring-loaded hook 1003, one end of which is connected to the annular body 1000. A ratchet 2304 on the units digit wheel 23 engages with the spring-loaded hook 1003 of the dose protection plate 10. Before the inhalation trigger mechanism is activated, the spring-loaded hook 1003 engages with one of the ratchet 2304 on the units digit wheel 23. When the inhalation trigger mechanism is activated, the intake baffle 11 rotates, thereby triggering the dose protection plate 10 to rotate under the action of the drive arm of the drive torsion spring 16. The rotation of the dose protection plate 10 causes the spring-loaded hook 1003 to... Synchronously rotating, the spring arm pawl 1003 rotates and hooks the next ratchet 2304 on the units digit wheel 23; during the closing process of the outer cover 4, the inhalation trigger mechanism is reset, the dose protection plate 10 reverses and returns to its original state before the inhalation trigger mechanism is triggered. Since the spring arm pawl 1003 of the dose protection plate 10 hooks the next ratchet 2304 on the units digit wheel 23, during this process, the dose protection plate 10 reverses and hooks the ratchet 2304 and also rotates. The units digit wheel 23 rotates under the action of the spring arm pawl 1003 to achieve a number jump.

[0221] In a preferred embodiment, the units digit wheel 23 is provided with ten ratchet teeth 2304. When the inhalation trigger mechanism is activated, the trigger dose protection plate 10 rotates 38°, and the spring arm pawl 1003 hooks onto the next ratchet tooth 2304. When the inhalation trigger mechanism is reset, the dose protection plate 10 rotates 38°, and the units digit wheel 23 rotates 36° under the action of the spring arm pawl 1003 to achieve a single digit change.

[0222] Furthermore, the powder container 7 is also equipped with a limiting arm 711, specifically, as follows: Figure 13B As shown, the side of the second cylindrical groove 712 of the powder container 7 has a limiting spring arm 711, which is used to limit the unidirectional rotation of the counting mechanism. The limiting spring arm 711 on the powder container 7, in conjunction with the ratchet 2304 on the units digit wheel 23, enables the unidirectional rotation of the units digit wheel 23. That is, when the dose protection plate 10 rotates downwards, the spring arm hook 1003 on the dose protection plate 10 scrapes the units digit wheel 23. Due to the action of the limiting spring arm 711 on the ratchet 2304 of the units digit wheel 23, the units digit wheel 23 will not rotate with the dose protection plate 10. When the dose protection plate 10 returns to its original position, the spring arm hook 1003 on the dose protection plate 10 pulls the units digit wheel 23 to rotate 36° to achieve unidirectional decrementing counting. Through the above settings, the problem of the spring arm hook 1003 driving the units digit wheel 23 when the dose protection plate 10 rotates downwards, thus preventing the counter from malfunctioning, can be effectively prevented.

[0223] To facilitate understanding, the following section will explain the working relationship between the various functional mechanisms in the process of closing the cover, as well as how the counting mechanism is triggered and how each functional mechanism is reset during the closing process.

[0224] During the closing process of the outer cover 4, that is, during the process of the outer cover 4 reversing from the second position to the first position, the powder delivery mechanism and the air compression mechanism are reset respectively, and the air intake baffle 11 is triggered to reverse and reset, so that the powder inhaler returns to its original state; wherein, the dose protection plate 10 resets and drives the counter to achieve a count of a number.

[0225] The angle of the outer cover 4 in the first position is defined as 0°, and the angle of the outer cover 4 in the second position is greater than or equal to 120° and less than or equal to 180°. In one embodiment, the angle of the outer cover 4 in the second position is 150°. The closing process of the outer cover 4 (the process of the outer cover 4 returning from the second position to the first position), that is, the process of the outer cover 4 reversing from 150° to 0°, firstly reverses a section of idle stroke, and the outer cover 4 drives the drive cam 12 to also reverse a section of idle stroke. Preferably, the outer cover 4 first reverses 62.5° of idle stroke, and the corresponding drive cam 12 reverses 75° of idle stroke, that is, when the closing idle stroke of the outer cover 4 ends, the angle of the outer cover 4 is 87.5°, and the angle of the drive cam 12 is 105°. As the outer cover 4 rotates from 87.5° to 0°, the drive cam 12 drives the powder metering wheel 9 to rotate and reset. The powder metering wheel 9 rotates from the fourth position to the third position, and the dosing cup 902 of the powder metering wheel 9 rotates from the position corresponding to the inlet 704 of the suction channel 706 to the position corresponding to the powder outlet 713 of the powder container 7, thereby resetting the powder delivery mechanism. During this process, the drive cam 12 rotates from 105° to 0°. When the outer cover 4 returns to the first position, that is, after the cover is closed, the arc-shaped rib 405 on the outer cover 4 cooperates with the audible spring arm 108 on the front housing 1 to provide an audible prompt that the cover is closed.

[0226] Because the outer cover 4 and the drive gear 5 are driven by gear meshing, there is gear backlash, which prevents the outer cover 4 from closing tightly against the front housing 1. To eliminate the problem of the outer cover 4 failing to close tightly with the front housing 1 due to gear backlash after closing, as follows... Figure 8A and Figure 8B As shown, a second clamping spring arm 502 is provided on the drive gear 5, and a limiting boss 106 is provided on the front housing 1. The second clamping spring arm 502 cooperates with the limiting boss 106 of the front housing 1 to achieve clamping closure, so that the outer cover 4 fits tightly with the front housing 1, ensuring that the cover is closed in place. At the same time, during the opening process of the outer cover 4, that is, during the process of the outer cover 4 rotating from the first position to the second position, initially it is an open travel. The rotation of the outer cover 4 needs to overcome the resistance of the limiting boss 106 on the second clamping spring arm 502, so that the second clamping spring arm 502 can pass over the limiting boss 106 to facilitate the rotation of the outer cover 4, which can prevent accidental opening due to non-human factors.

[0227] Further, see Figure 5A , Figure 6A and Figure 7A and Figure 7BThe outer cover 4 has a limiting groove 403 on the connecting part 406 where the arc-shaped rib 405 is provided, and the front shell 1 also has a limiting protrusion 107. When the outer cover 4 is closed, that is, when the outer cover 4 is in the first position, the limiting protrusion 107 is engaged in the limiting groove 403 to limit the outer cover 4 to the first position. The cooperation between the limiting groove 403 and the limiting protrusion 107 of the front shell 1 achieves a tight closure between the outer cover 4 and the front shell 1, and a good fit is achieved between the outer cover 4 and the front shell 1, so that there will be no gaps due to incomplete closure. At the same time, at the initial stage of the opening process of the outer cover 4, that is, within the opening idle stroke of the outer cover 4, it is also necessary to overcome the force of the limiting groove 403 on the limiting protrusion 107 so that the limiting protrusion 107 can be disengaged from the limiting groove 403 to allow the outer cover 4 to rotate, further preventing accidental opening due to non-human factors.

[0228] It is understood that a limiting protrusion 106 and a second clamping spring arm 502 are provided at the position corresponding to one of the connecting parts 406 of the outer cover 4, and a limiting groove 403 and a limiting protrusion 107 are provided at the position corresponding to the other connecting part 406. The closing limit is provided on both sides of the outer cover 4, so that when the outer cover 4 is in the first position, both sides of the outer cover 4 can fit well with the front shell 1, effectively avoiding the problem that the outer cover 4 is not closed properly, or that the outer cover 4 and the front shell 1 are closed properly on one side but there is a gap on the other side, thus ensuring the consistency of the closing state.

[0229] During the closing process of the outer cover 4, since the tip of the protrusion 1704 of the airbag pressure member 17 is confined within the stop groove 1213, the tip of the protrusion 1704 of the airbag pressure member 17 must first be driven to disengage from the stop groove 1213. That is, it is necessary to overcome the resistance of the stop groove 1213 on the tip of the protrusion 1704 of the airbag pressure member 17. During this process, the outer cover 4 performs the first closing empty stroke, and the outer cover 4 reverses from 150° to 140°, which requires a large torque. Preferably, the torque of the outer cover 4 is 0.05 N·m during the first closing empty stroke. The driving cam 12 rotates so that the tip of the protrusion 1704 of the airbag pressure member 17 disengages from the stop groove 1213 and abuts against the second curved surface section 1212, which can effectively prevent accidental closing due to non-human factors.

[0230] During the process of the outer cover 4 reversing from 140° to 87.5°, the outer cover 4 drives the drive cam 12 to reverse to 105°. During this process, the annular boss 1207 of the drive cam 12 does not contact the first boss 905 of the powder metering wheel 9, and the powder metering wheel 9 does not rotate. The outer cover 4 performs the second closing stroke, and only the second drive cam 12 is reversing and resetting. The tip of the protrusion 1704 of the airbag pressure member 17 abuts against the second curved surface section 1212. Since the second curved surface is an arc surface, the airbag pressure member 17 does not move during this process and remains in the sixth position. During this process, it is not necessary to drive the powder metering wheel 9 to rotate or drive the airbag pressure member 17 to reset. The torque required by the outer cover 4 during the second closing stroke is small and constant. Preferably, the torque of the outer cover 4 during the second closing stroke is 0 N·m, which accelerates the closing process and increases the smoothness of closing.

[0231] When the outer cover 4 is reversed to 87.5°, the annular boss 1207 of the drive cam 12 begins to contact the first boss 905 of the powder metering wheel 9. During the process of the outer cover 4 reversing from 87.5° to 62.5°, it drives the drive cam 12 to reverse from 105° to 75°. During this process, the outer cover 4 performs the first closing load stroke. The annular boss 1207 of the drive cam 12 engages with the first boss 905 of the powder metering wheel 9 and drives the powder metering wheel 9 to reverse. The powder metering wheel 9 begins to rotate from the fourth position to the third position. During this process, only the powder metering wheel 9 is resetting. The tip of the protrusion 1704 of the airbag pressure member 17 is still abutting against the second curved surface section 1212, and the airbag pressure member 17 is still in the sixth position. Since the outer cover 4 needs to drive the powder metering wheel 9 to reverse and reset during the first closing load stroke, a large constant torque is required. Preferably, the torque of the outer cover 4 during the first closing load stroke is 0.1 N·m to ensure that the powder metering wheel 9 can be driven to reverse.

[0232] Furthermore, during the closing process of the outer cover 4, in a preferred embodiment, as the outer cover 4 rotates from 62.5° to 0°, the drive cam 12 rotates from 75° to 0°. The first curved section 1211 of the cam surface 1202 on the drive cam 12 engages with the arc surface 1703 of the airbag pressure member 17. When the drive cam 12 rotates, the first curved section 1211 of the cam surface 1202 continuously pushes up the airbag pressure member 17 until the arc surface 1703 of the airbag pressure member 17 falls into the arc groove 1201 of the drive cam 12, thus completing the reset of the air compression mechanism.

[0233] See Figures 24A to 24FSpecifically, during the closing process of the outer cover 4, in a preferred embodiment, as the outer cover 4 rotates from 56° to 25°, the drive cam 12 rotates from 68° to 30°. During this process, the drive spring arm 910 on the powder metering wheel 9 cooperates with the wedge-shaped post 1005 of the dose protection plate 10 to drive the dose protection plate 10 to rotate and reset.

[0234] Specifically, during the process of the outer cover 4 rotating from 87.5° to 56°, see... Figure 24A and Figure 24C During this process, the drive arm 910 on the powder metering wheel 9 did not contact the wedge-shaped post 1005 of the dose protection plate 10, and the dose protection plate 10 did not reverse. See also Figure 24B and Figure 24D When the outer cover 4 rotates to 56°, the drive spring arm 910 on the powder metering wheel 9 begins to contact the wedge-shaped post 1005 of the dose protection plate 10. During the rotation of the outer cover 4 from 56° to 25°, the annular boss 1207 of the drive cam 12 contacts the first boss 905 of the powder metering wheel 9. The rotation of the drive cam 12 causes the powder metering wheel 9 to rotate, and the force exerted by the drive spring arm 910 of the powder metering wheel 9 on the wedge-shaped post 1005 of the dose protection plate 10 causes the dose protection plate 10 to rotate 38°, thus resetting the dose protection plate 10. During the rotation of the outer cover 4 from 8° to 0°, the dose protection plate 10 has already reset and no longer rotates; only the powder metering wheel 9 continues to rotate during this process. See [link to relevant documentation]. Figure 24E and Figure 24F When the driving spring arm 910 on the powder metering wheel 9 passes over the wedge-shaped post 1005 of the dosage protection plate 10, and the outer cover 4 is reversed to 0°, the powder metering wheel 9 is reset in place, the limiting protrusion 107 is locked in the limiting groove 403, and the second pressing spring arm 502 acts on the limiting protrusion 106 to ensure that the outer cover 4 is closed in place.

[0235] Before the outer cover 4 is fully closed, when the outer cover 4 is reversed to 12.5°, the drive cam 12 is reversed to 15°. The protrusion 1208 on the drive cam 12 moves away from the drive arm of the reset torsion spring 15, and the drive arm of the reset torsion spring 15 acts again on the third cylinder 1102 on the air intake baffle 11, providing a reset force for the air intake baffle 11. Under the reset clamping force of the reset torsion spring 15 on the air intake baffle 11, the air intake baffle 11 reverses to complete the reset. The clamping arc surface 1002 of the dose protection plate 10 acts again on the arc groove surface 1107 of the air intake baffle 11 to achieve concentric arc surface clamping, and the dose protection plate 10 of the intake trigger mechanism completes the reset. As the outer cover 4 rotates from 8° to 0°, the drive spring arm 910 on the powder metering wheel 9 passes over the wedge post 1005 on the dose protection plate 10. During this process, the outer cover 4 completes its third closing load stroke, and the powder metering wheel 9 continues to rotate, while the dose protection plate 10 has already reset and no longer rotates. After the drive spring arm 910 on the powder metering wheel 9 passes over the wedge post 1005 on the dose protection plate 10, the drive spring arm 910 no longer applies force to the wedge post 1005. Under the action of the drive torsion spring 16, the pressing arc surface 1002 of the dose protection plate 10 will act again on the arc groove surface 1107 of the air intake baffle 11 to achieve concentric arc surface pressing. This ensures that the powder metering wheel 9 resets completely after the inhalation trigger mechanism has reset, avoiding the situation where the inhalation trigger mechanism does not reset properly.

[0236] During the process of the outer cover 4 rotating from 62.5° to 8°, the powder metering wheel 9 needs to be reversed and reset simultaneously, and the airbag pressure member 17 needs to be pushed up and reset simultaneously. During this process, the outer cover 4 performs the second closing load stroke, which requires a large torque, and the torque of the second closing load stroke gradually increases. Preferably, within the second closing load stroke, the torque of the outer cover 4 gradually increases from 0.10 N·m to 0.20 N·m to ensure that the powder metering wheel 9 and the airbag pressure member 17 can be continuously reset. When the outer cover 4 rotates to 8°, the airbag pressure member 17 is reset, that is, the airbag pressure member 17 is reset to the fifth position, and the tip of the protrusion 1704 of the airbag pressure member 17 re-enters the arc-shaped groove 1201 to limit the airbag pressure member 17. During the process of the outer cover 4 reversing from 8° to 0°, the outer cover 4 performs the third closing load stroke. During this process, it is necessary to overcome the resistance of the powder metering wheel 9 passing over the wedge column 1005. Preferably, the torque of the outer cover 4 in the third closing load stroke is 0.1 N·m until the closing is completed.

[0237] Specifically, during the first and second cover load strokes, the outer cover 4 drives the dosage protection plate 10 to reset beyond the inlet 704 of the inhalation channel 706 via the powder metering wheel 9, compressing the drive torsion spring 16. Simultaneously, the reset torsion spring 15 drives the air intake baffle 11 to reset and rotate, closing the airflow channel 708. During the third cover load stroke, the powder metering wheel 9 disengages from the dosage protection plate 10. Specifically, the drive spring arm 910 of the powder metering wheel 9 disengages from the wedge-shaped post 1005 of the dosage protection plate 10. The drive torsion spring 16 drives the dosage protection plate 10 to rotate, causing the blocking part 1004 of the dosage protection plate 10 to rotate to the inlet 704 of the inhalation channel 706, and is limited by the air intake baffle 11 to the position of the inlet 704 of the inhalation channel 706.

[0238] See Figures 29 to 30 , Figure 29 This is a cross-sectional schematic diagram of another embodiment of the powder inhaler provided in this application. Figure 30 This is a cross-sectional schematic diagram of another embodiment of the powder inhaler provided in this application.

[0239] exist Figure 1 The powder inhaler shown employs a compressed air mechanism and a large powder outlet 713 for powder filling. In this embodiment, see [link to relevant documentation]. Figure 9C and Figure 9D The cross-sectional area of ​​the powder outlet 713 of the powder container 7 is larger than the cross-sectional area of ​​the dosing cup 902 on the powder metering wheel 9. The larger size of the powder outlet 713 of the powder container 7 allows for more efficient gas compression and powder filling processes. In other embodiments, this method may not be used. Figure 9C Compressed air is performed as shown.

[0240] For example, such as Figure 29 As shown, in another embodiment, the powder inhaler may not have a compressor mechanism and may instead use a large-sized powder outlet 713, making the cross-sectional area of ​​the powder outlet 713 of the powder container 7 larger than the cross-sectional area of ​​the dosing cup 902 on the powder metering wheel 9. Since the outer cover 4 of the powder inhaler provided in the embodiments of this application is always parallel to the vertical direction during the opening and closing process, during powder filling, the powder outlet 713 at the bottom of the storage cavity 715 is always directly above the dosing cup 902 of the powder metering wheel 9 along the vertical direction. The powder can be filled into the dosing cup 902 of the powder metering wheel 9 directly by the gravity of the powder in the storage cavity 715 of the powder container 7.

[0241] Or, such as Figure 30As shown, in another embodiment, a compressor mechanism can also be provided in the powder inhaler. However, the powder outlet 713 of the powder container 7 is set to a small-sized powder outlet 713. Specifically, the cross-sectional area of ​​the powder outlet 713 of the powder container 7 is smaller than the cross-sectional area of ​​the dosing cup 902 on the powder metering wheel 9. The cross-sectional shape of the powder outlet 713 can be circular or other shapes, and the diameter of the powder outlet 713 is between 1mm and 3mm, so that the powder in the powder container 7 can be compacted and filled into the dosing cup 902 on the powder metering wheel 9 by the compressor mechanism, thereby achieving powder filling. The specific settings of the compressor and powder filling can be designed or selected as needed, and this application does not limit them.

[0242] The following describes the specific operating status of the powder inhaler during the entire process from opening to closing the lid, that is, the outer cover 4 rotates from the first position (0°) to the second position (150°), the user inhales, and the outer cover 4 rotates back from the second position (150°) to the first position (0°).

[0243] (I) Opening process

[0244] During the opening process of the outer cover 4, that is, during the process of the outer cover 4 rotating from the first position (0°) to the second position (150°), the following steps are performed in chronological order: opening empty stroke, air compression process and powder delivery process.

[0245] (1) Opening lid during idle stroke

[0246] During the open-end stroke, the outer cover 4 rotates from 0° to 12°. The rotation from 0° to 8° is to prevent the outer cover 4 from opening due to non-human factors, and the rotation from 8° to 12° is to prevent accidental opening. When the outer cover 4 is in the first position, i.e., 0°, the outer cover 4 covers the suction nozzle 101.

[0247] (2) Compression process

[0248] During the compression process, the outer cover 4 rotates from 12° to 62.5°. Specifically, during the rotation from 12° to 55°, the compression function is achieved, compacting the powder in the storage cavity 715 of the powder container 7 into the dosing cup 902 of the powder metering wheel 9. When the outer cover 4 rotates to 55°, the pressure relief hole 1702 and the vent hole 709 are at a critical connection point. During the rotation from 55° to 62.5°, the pressure relief hole 1702 and the vent hole 709 connect, achieving the pressure relief function and releasing the compressed gas in the storage cavity 715 of the powder container 7 to atmospheric pressure, preventing powder leakage when the powder metering wheel 9 rotates. This process allows the outer cover 4 to open instantaneously, enabling the compression mechanism to rapidly compress gas and improve the compression effect.

[0249] (3) Powder delivery process

[0250] During powder delivery, the outer cover 4 rotates from 62.5° to 150°. This rotation drives the drive cam 12 to rotate. The annular boss 1207 of the drive cam 12 engages with the first boss 905 of the powder metering wheel 9. The drive cam 12 rotates, causing the powder metering wheel 9 to rotate 105°, moving it from the third position to the fourth position. The dosing cup 902 of the powder metering wheel 9 rotates from its position corresponding to the powder outlet 713 of the storage cavity 715 of the powder container 7 to its position corresponding to the inlet 704 of the suction channel 706. When the outer cover 4 rotates to the second position, the arc-shaped rib 405 on the outer cover 4 engages with the audible spring arm 108 on the front housing 1 to provide an audible indication that the outer cover 4 is fully open.

[0251] (II) Inhalation Triggering Process

[0252] After the powder delivery process is completed, the dosing cup 902 of the powder metering wheel 9 is delivered to the position corresponding to the inlet 704 of the inhalation channel 706. The shielding part 1004 of the dosing protection plate 10 covers the dosing cup 902 of the powder metering wheel 9, the outer cover 4 is in the second position (150°), and the outlet 102 of the nozzle 101 is exposed. When the user inhales at the outlet 102 of the nozzle 101, if the user's inhalation airflow velocity is greater than the working threshold (20L / min~25L / min) and the negative pressure in the inhalation channel 706 is greater than the threshold, the inhalation triggering mechanism is activated. The air intake baffle 11 rotates, and the pressing arc surface 1002 of the dose protection plate 10 disengages from the arc groove surface 1107 of the air intake baffle 11. The dose protection plate 10 rotates 38° under the driving action of the drive torsion spring 16. The shielding part 1004 of the dose protection plate 10 deviates from and does not shield the dose cup 902 of the powder metering wheel 9. The dose cup 902 is exposed at the inlet 704 of the inhalation channel 706. The dose cup 902 is connected to the inhalation channel 706, and the powder in the dose cup 902 is exposed to the user's inhalation airflow and is carried away, completing the inhalation triggering process.

[0253] (III) Closing process

[0254] After the inhalation triggering process is completed, the cover closing process begins. During the closing process, the outer cover 4 reverses and resets from the second position (150°) to the first position (0°). Simultaneously, the outer cover 4 drives the air compressor, powder metering wheel 9, dosage protection plate 10, and air intake baffle 11 to reset. Specifically, the cover closing process includes a cover-closing idle stroke and a functional mechanism reset process.

[0255] (1) Close the cover during idle travel

[0256] During the empty travel of closing the cover, the outer cover 4 rotates from 150° to 87.5° (i.e., the outer cover 4 rotates 62.5°). The process of rotating the outer cover 4 from 150° to 140° is to prevent non-human factors from triggering the closing of the cover. In the later stage of the empty travel of closing the cover, the outer cover 4 rotates from 140° to 87.5°.

[0257] (2) Functional mechanism reset process

[0258] During the reset process of the functional mechanism, the outer cover 4 rotates from 87.5° to 0°. During this process, the powder metering wheel 9 rotates continuously and resets from the fourth position to the third position. During the process of the outer cover 4 rotating from 87.5° to 62.5°, only the powder metering wheel 9 rotates in reverse. During the process of the outer cover 4 rotating from 62.5° to 8°, the powder metering wheel 9 rotates in reverse, and at the same time, the airbag pressure component 17 continuously pushes upward to reset the air compression mechanism. During the process of the outer cover 4 rotating from 56° to 25°, the drive spring arm 910 on the powder metering wheel 9 cooperates with the wedge-shaped column 1005 of the dose protection plate 10 to drive the dose protection plate 10 to rotate and reset. The pressing arc surface 1002 of the dose protection plate 10 acts again on the arc groove surface 1107 of the air intake baffle 11 to achieve concentric arc surface pressing, and the air intake trigger mechanism completes the reset. During the process of the outer cover 4 rotating from 8° to 0°, the air compression mechanism has been reset. At this time, the closing stroke overcomes the rotational resistance of the powder metering wheel 9. When the outer cover 4 is in the first position (0°), the reset of the powder metering wheel 9 is completed. When the outer cover 4 returns to the first position, the arc-shaped rib 405 on the outer cover 4 cooperates with the sound spring arm 108 on the front shell 1 to provide a sound prompt that the cover is closed.

[0259] As can be seen from the above, the outer cover 4 has different functions at different positions during the opening and closing process, such as idle travel or driving different functional mechanisms. Based on the different functions of the outer cover 4 at different positions during the opening and closing process, this application has designed the torque of the outer cover 4 within different strokes during the opening and closing process, making the opening and closing process of the powder inhaler more suitable for user habits.

[0260] See Figures 31 to 33B , Figure 31 yes Figure 1 A schematic diagram illustrating the opening and closing process of the powder inhaler's cover is provided. Figure 32A yes Figure 1 A schematic diagram of the opening angle versus torque in one embodiment of the powder inhaler opening process. Figure 32B yes Figure 1 A schematic diagram of the closing angle versus torque in one embodiment of the provided powder inhaler closing process. Figure 33A yes Figure 1 A schematic diagram of the opening angle versus torque in another embodiment of the powder inhaler opening process. Figure 33B yes Figure 1 A schematic diagram of the closing angle versus torque in another embodiment of the provided powder inhaler's closing process.

[0261] (I) Opening process

[0262] See Figure 31 and Figure 32A , Figure 32B In some embodiments, the stroke of the outer cover 4 from the first position to the second position (i.e., the opening process) includes an empty opening stroke and an opening load stroke after the empty opening stroke. For example, the stroke of the outer cover 4 from the first position to the second position only includes an empty opening stroke and an opening load stroke after the empty opening stroke.

[0263] During the no-load stroke of the lid opening mechanism, the outer lid 4 does not trigger the operation of the functional mechanism. During the load stroke of the lid opening mechanism, the outer lid 4 triggers the functional mechanism to deliver powder to the suction channel 706. The maximum torque of the outer lid 4 during the no-load stroke is greater than the maximum torque during the load stroke, ensuring that accidental opening due to non-human factors is prevented during the no-load stroke. Simultaneously, it also ensures rapid or stable operation at different stages during the load stroke. Preferably, the torque of the outer lid 4 during the no-load stroke is greater than or equal to 0.05 N·m and less than or equal to 0.3 N·m, and the torque of the outer lid 4 during the load stroke is greater than or equal to 0 N·m and less than or equal to 0.15 N·m.

[0264] The angle of the outer cover 4 in the first position is defined as 0°, and the angle of the outer cover 4 in the second position is greater than or equal to 120° and less than or equal to 180°. In a preferred embodiment, the angle of the outer cover 4 in the second position is 150°. The critical angle between the open-cover idle stroke and the open-cover load stroke is greater than or equal to 10° and less than or equal to 15°. In a preferred embodiment, the critical angle between the open-cover idle stroke and the open-cover load stroke is specifically 12°. That is, the open-cover idle stroke of the outer cover 4 is between 0° and 12°, and the open-cover load stroke is between 12° and 150°.

[0265] (1) Opening lid during idle stroke

[0266] The lid-opening idle stroke includes the first lid-opening idle stroke and the second lid-opening idle stroke following the first lid-opening idle stroke. The critical angle between the first lid-opening idle stroke and the second lid-opening idle stroke is greater than or equal to 6° and less than or equal to 10°. For example... Figure 28 As shown, in a preferred embodiment, the critical angle between the first and second lid-opening idle strokes is 8°. That is, the first lid-opening idle stroke is between 0° and 8°, and the second lid-opening idle stroke is between 8° and 12°.

[0267] Specifically, the torque of the outer cover 4 during the first open-cover idle stroke is greater than or equal to 0.02 N·m and less than or equal to 0.08 N·m, and the torque of the outer cover 4 during the second open-cover idle stroke is greater than or equal to 0.1 N·m and less than or equal to 0.2 N·m. Preferably, the torque of the outer cover 4 during the first open-cover idle stroke is 0.05 N·m, that is, the initial torque set between 0° and 8° is 0.05 N·m, which can effectively prevent opening by non-human factors. The torque of the outer cover 4 during the second open-cover idle stroke is 0.15 N·m, that is, the torque set between 8° and 12° is 0.15 N·m. The larger opening resistance set between 8° and 12° can prevent accidental opening.

[0268] (2) Load stroke when opening the lid

[0269] The cap opening load stroke includes a first cap opening load stroke and a second cap opening load stroke following the first cap opening load stroke. During the first cap opening load stroke, the outer cap 4 triggers the air compression mechanism to press the powder from the storage chamber 715 into the dosing cup 902. During the second cap opening load stroke, the outer cap 4 triggers the dosing cup 902 to deliver the powder to the inhalation channel 706.

[0270] The critical angle between the first and second lid-opening load strokes is greater than or equal to 60° and less than or equal to 65°. In a preferred embodiment, the critical angle between the first and second lid-opening load strokes is 62.5°. That is, the first lid-opening load stroke is between 12° and 62.5°, and the second lid-opening load stroke is between 62.5° and 150°.

[0271] The torque of the outer cover 4 is constant during the first opening load stroke, and is greater than or equal to 0 N·m and less than or equal to 0.05 N·m. Preferably, the torque of the outer cover 4 during the first opening load stroke is 0 N·m, that is, the torque of the outer cover 4 is set to 0 N·m between 12° and 62.5°. During the first opening load stroke, the air compression process is carried out. Setting the torque to 0 N·m within this angle range allows for instantaneous opening when the cover is opened, enabling the air compression mechanism to rapidly compress air and improve the air compression effect.

[0272] The torque of the outer cover 4 is constant during the second opening load stroke, which is greater than or equal to 0.05 N·m and less than or equal to 0.15 N·m. Preferably, the torque of the outer cover 4 during the second opening load stroke is 0.1 N·m, that is, the torque set for the outer cover 4 between 62.5° and 150° is 0.1 N·m. During the powder delivery process of the outer cover 4 during the second opening load stroke, the outer cover 4 must open at a uniform speed and smoothly, maintaining a constant torque of 0.1 N·m during the second opening load stroke without sudden torque changes until the opening is complete, thus ensuring the powder delivery effect.

[0273] (II) Closing process

[0274] See Figure 31 and Figure 32A , Figure 32B In some embodiments, the travel of the outer cover 4 from the second position to the first position (i.e., the closing process) includes a closing empty travel and a closing load travel after the closing empty travel, wherein the outer cover 4 triggers the functional mechanism to reset during the closing load travel.

[0275] The angle of the outer cover 4 in the first position is defined as 0°, and the angle of the outer cover 4 in the second position is greater than or equal to 120° and less than or equal to 180°. In a preferred embodiment, the angle of the outer cover 4 in the second position is 150°. In some embodiments, the critical angle between the no-load travel and the load travel of the cover is greater than or equal to 80° and less than or equal to 95°. Preferably, the critical angle between the no-load travel and the load travel of the cover is 87.5°. That is, the no-load travel of the outer cover 4 is between 150° and 87.5°, and the load travel of the outer cover 4 is between 87.5° and 0°.

[0276] (1) Close the cover during idle travel

[0277] The maximum torque of the outer cover 4 during the empty stroke of closing the cover is greater than or equal to 0.03 N·m and less than or equal to 0.07 N·m. Preferably, the maximum torque of the outer cover 4 during the empty stroke of closing the cover can prevent accidental closing due to non-human factors.

[0278] In some embodiments, the lid-closing empty travel includes a first lid-closing empty travel and a second lid-closing empty travel following the first lid-closing empty travel, wherein the critical angle between the first lid-closing empty travel and the second lid-closing empty travel is greater than or equal to 135° and less than or equal to 145°. Preferably, the critical angle between the first lid-closing empty travel and the second lid-closing empty travel is 140°. That is, the first lid-closing empty travel is between 150° and 140°, and the second lid-closing empty travel is between 140° and 87.5°.

[0279] The torque of the outer cover 4 during the first closing stroke is constant, being greater than or equal to 0.03 N·m and less than or equal to 0.07 N·m. Preferably, the torque of the outer cover 4 during the first closing stroke is 0.05 N·m, that is, the torque of the outer cover 4 between 150° and 140° is 0.05 N·m, which can prevent non-human factors from triggering the closing of the cover.

[0280] The torque of the outer cover 4 during the idle stroke of the second closing cover is constant and is less than or equal to 0.02 N·m. Preferably, the torque of the outer cover 4 during the idle stroke of the second closing cover is 0 N·m, which can accelerate the closing process and increase the smoothness of closing the cover.

[0281] (2) Closing load stroke

[0282] The maximum torque of the outer cover 4 during the closing load stroke is greater than 0.05 N·m and less than or equal to 0.3 N·m. Specifically, the closing load stroke includes a first closing load stroke, a second closing load stroke, and a third closing load stroke arranged in chronological order. During the first closing load stroke, the outer cover 4 only triggers the powder metering wheel 9 to reset and rotate. During the second closing load stroke, the outer cover 4 continues to trigger the powder metering wheel 9 to reset and rotate, and also triggers the air compressor mechanism to complete the reset. During the third closing load stroke, the outer cover 4 only triggers the powder metering wheel 9 to reset and rotate, and triggers the powder metering wheel 9 to reset and rotate to the first position. During the closing load stroke, the outer cover 4 also triggers the dose protection plate 10 and the air intake baffle 11 to complete the reset.

[0283] The critical angle between the load stroke of the first and second lids is greater than or equal to 60° and less than or equal to 65°. Preferably, the critical angle between the load stroke of the first and second lids is 62.5°, that is, the load stroke of the outer lid 4 is between 87.5° and 62.5°. The critical angle between the load stroke of the second and third lids is greater than or equal to 6° and less than or equal to 10°. Preferably, the critical angle between the load stroke of the second and third lids is 8°, that is, the load stroke of the outer lid 4 is between 62.5° and 8°, and the load stroke of the outer lid 4 is between 8° and 0°.

[0284] The torque of the outer cover 4 during the first closed cover load stroke is constant, which is greater than or equal to 0.05 N·m and less than or equal to 0.15 N·m. Preferably, the torque of the outer cover 4 during the first closed cover load stroke is 0.1 N·m, that is, the torque of the outer cover 4 between 87.5° and 62.5° is 0.1 N·m. Only the powder metering wheel 9 rotates during the first closed cover load stroke.

[0285] The torque of the outer cover 4 gradually increases during the second closing cover load stroke, with a maximum value greater than or equal to 0.15 N·m and less than or equal to 0.3 N·m. Preferably, the torque of the outer cover 4 during the second closing cover load stroke gradually increases from 0.10 N·m to 0.20 N·m, that is, the torque of the outer cover 4 between 62.5° and 8° gradually increases from 0.10 N·m to 0.20 N·m. During the second closing cover load stroke, the powder metering wheel 9 continues to rotate, and the airbag pressure member 17 is undergoing a continuous upward reset process.

[0286] The torque of the outer cover 4 during the third closing load stroke is constant, greater than or equal to 0.05 N·m and less than or equal to 0.15 N·m. Preferably, the torque of the outer cover 4 during the third closing load stroke is 0.1 N·m, that is, the torque of the outer cover 4 from 8° to 0° is 0.1 N·m. During the third closing load stroke, the airbag pressure member 17 has completed its reset. At this time, the closing stroke overcomes the rotational resistance of the powder metering wheel 9 until the closing is completed.

[0287] See Figure 33A and Figure 33B In another embodiment, the opening and closing processes of the outer cover 4 of the powder inhaler can also be performed as follows: Figure 33A and Figure 33B The relationship between the opening / closing cover angle and the torque shown in this embodiment is such that the torque change during the opening and closing processes has a gradual curve, with fewer sudden torque changes, making it more user-friendly.

[0288] See Figures 34A to 34E , Figure 34A yes Figure 1 The provided schematic diagram of the powder inhaler is shown from below at an angle. Figure 34B yes Figure 34A The provided diagram shows the powder inhaler placed on a horizontal plane. Figure 34C yes Figure 34A A diagram showing the powder inhaler in handheld mode. Figure 34D yes Figure 34A The provided powder inhaler is shown in a diagram after opening the cap in handheld mode. Figure 34E yes Figure 34A A schematic diagram of the powder inhaler in oral inhalation mode.

[0289] See Figure 1 , Figure 5A , Figure 5B , Figure 34A and Figure 34B The outer cover 4 of the powder inhaler includes two connecting parts 406 arranged opposite each other along a first direction and a free end 407 located on one side of the two connecting parts 406 along a second direction. The first direction and the second direction intersect. The two connecting parts 406 are respectively rotatably connected to opposite sides of the bottom end of the housing assembly and protrude from the bottom end of the housing assembly. The free end 407 and the two connecting parts 406 are used to support the housing assembly, so that the powder inhaler can be stably placed on a horizontal surface. The three support points of the two connecting parts 406 and the free end 407 can achieve stable placement and prevent the powder inhaler from tipping over due to unstable placement.

[0290] This invention ensures that during use and storage, the powder container 7 is always above the powder metering wheel 9. Excessive changes in the device's position can cause frequent movement of the powder in the powder container 7, leading to problems such as powder variation, for example, the effective components of the powder detaching from the carrier, the powder particles becoming smaller, and small particles accumulating at the bottom. This invention ensures that the powder in the powder container 7 remains in a relatively stable state throughout the entire service life of the powder inhaler.

[0291] For example, such as Figure 34B As shown, when the bottom of the powder inhaler is placed on a horizontal plane, the tilt angle of the axis of the housing assembly relative to the vertical direction is greater than or equal to 0° and less than or equal to 15°. Preferably, when the bottom of the powder inhaler is placed on a horizontal plane, the tilt angle of the axis of the housing assembly relative to the vertical direction is 6°. This can further ensure that the change in the position of the device is small, and ensure that the powder in the powder container 7 is always in a relatively stable state when the powder inhaler is placed on a horizontal plane (i.e., in the storage state).

[0292] For example, such as Figure 34C and Figure 34D As shown, the powder inhaler is in a vertical position when the lid is opened and closed by hand. The axis of the powder inhaler's housing assembly is parallel to the vertical direction, which makes it easier to open and close the lid and also makes the change in the position of the device smaller, ensuring that the powder in the powder container 7 is in a relatively stable state during the opening and closing process.

[0293] For example, such as Figure 34E As shown, during the user's mouth inhalation, the tilt angle of the axis of the powder inhaler's housing assembly relative to the vertical direction is greater than or equal to 0° and less than or equal to 15°. Preferably, during the user's mouth inhalation, the tilt angle of the axis of the powder inhaler's housing assembly relative to the vertical direction is 15°. This ensures that the positional state of the powder inhaler changes little during mouth inhalation, the powder in the powder container 7 remains in a relatively stable state, and also ensures the convenience of the user's self-inhalation at the outlet 102 of the nozzle 101.

[0294] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A powder metering wheel applied to a powder inhaler, characterized in that, a first circular arc segment and a second circular arc segment are included and spaced apart from each other along a circumferential direction of the powder metering wheel; the first circular arc segment has a first circular arc surface, and the first circular arc surface is provided with a dose cup; wherein the first circular arc segment is configured to be elastically deformable in a radial direction of the powder metering wheel.

2. The powder metering wheel of claim 1, wherein, A bearing ring is provided at the center of the powder metering wheel, the bearing ring is spaced apart from the first circular arc segment, and is connected by a support rib; along the circumferential direction of the powder metering wheel, the first circular arc segment includes a first sub-circular arc segment and a second sub-circular arc segment located on both sides of the support rib, and the first sub-circular arc segment and the second sub-circular arc segment are elastically deformable to change the curvature of the first circular arc surface.

3. The powder metering wheel of claim 2, wherein, The first circular arc segment further includes a third sub-circular arc segment connecting the first sub-circular arc segment and the second sub-circular arc segment; the arc length of the first sub-circular arc segment and the second sub-circular arc segment is the same.

4. The powder metering wheel of claim 3, wherein, The arc length of the third sub-circular arc segment is 1 / 6-1 / 2 of the arc length of the first circular arc segment.

5. The powder metering wheel of claim 4, wherein, The arc length of the third sub-circular arc segment is 1 / 4-1 / 3 of the arc length of the first circular arc segment.

6. A powder metering wheel according to any one of claims 2-5, characterized in that The number of support ribs is one, and the two opposite outer sides of the support rib in the circumferential direction of the powder metering wheel are respectively a first outer side and a second outer side, and the portion of the first circular arc segment corresponding to the portion between the first outer side and the second outer side is the third sub-circular arc segment; or The number of support ribs is more than one, and the two outermost support ribs in the circumferential direction of the powder metering wheel are respectively a first support rib and a second support rib, the surface of the first support rib facing away from the second support rib is a third outer side, the surface of the second support rib facing away from the first support rib is a fourth outer side, and the portion of the first circular arc segment corresponding to the portion between the third outer side and the fourth outer side is the third sub-circular arc segment. 7.The powder metering wheel according to any one of claims 2-5, characterized in that, along the radial direction of the powder metering wheel, the support rib is elastically deformable so that the first circular arc segment is movable in the radial direction of the powder metering wheel.

8. A powder metering wheel according to any one of claims 2-5, characterized in that The bearing ring has a first end and a second end opposite to each other in the axial direction of the powder metering wheel, and the first end has a first top tight spring arm.

9. The powder metering wheel according to any one of claims 1-5, characterized in that The second circular arc segment has a second circular arc surface; when the first circular arc segment and the second circular arc segment are both in a non-deformed state, the diameter of the first circular arc surface is greater than the diameter of the second circular arc surface; the difference between the diameter of the first circular arc surface and the diameter of the second circular arc surface is greater than or equal to 0.4 mm and less than or equal to 5 mm.

10. A powder delivery mechanism for use in a powder inhaler, characterised in that, including: a powder container having a storage cavity, a first cylindrical groove and an inhalation channel; the storage cavity is used for storing powder, and the bottom end of the storage cavity has a powder outlet; the first cylindrical groove is located at the bottom end of the storage cavity and communicates with the powder outlet; the inhalation channel communicates with the first cylindrical groove; The powder metering wheel of any one of claims 1-9 is disposed in the first cylindrical groove and is rotatable back and forth between a third position and a fourth position; the powder metering wheel is configured such that, in the third position, the dose cup is disposed in correspondence with the powder outlet, and, in the fourth position, the dose cup is disposed in correspondence with the inlet of the inhalation channel. In the non-deformed state, the diameter of the first circular-arc surface is greater than or equal to the diameter of the inner arc surface of the first cylindrical groove, so that the first circular-arc surface is in interference fit or close contact with the inner arc surface of the first cylindrical groove.

11. The powder delivery mechanism of claim 10, wherein, The powder metering wheel of claim 8. The first cylindrical groove has a second cylinder, and the powder metering wheel is rotatably sleeved on the second cylinder. The first clamping arm is in cooperation with the second cylinder to provide a clamping force for the close contact between the inner arc surface of the first cylindrical groove and the first circular-arc surface.

12. The powder delivery mechanism of claim 10, wherein, The powder metering wheel of claim 9. In the non-deformed state, the diameter of the second circular-arc surface is less than the diameter of the inner arc surface of the first cylindrical groove.

13. A powder inhaler, characterised in that, The powder delivery mechanism of any one of claims 10-12 comprises: A dose protection plate is in rotational connection with the powder container and comprises an annular body and a shielding portion connected to each other; the shielding portion is used to shield or not shield the dose cup when the powder metering wheel is in the fourth position. A housing assembly has a mouthpiece; the powder delivery mechanism and the dose protection plate are disposed in the housing assembly, and the mouthpiece is in communication with the inhalation channel. An outer cover is in rotational connection with the housing assembly. The outer cover is rotatable back and forth between a first position and a second position; the outer cover is configured such that, in the first position, the outer cover shields the mouthpiece. The outer cover is configured such that, in the second position, the mouthpiece is exposed. ​

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