Bag valve assembly for quantitative atomization device and quantitative atomization device

Abstract

The present invention relates to a bag-valve assembly for a metered atomization device and a metered atomization device. The bag-valve assembly includes a valve core provided with a first concave cavity and a third through hole; a bag body; a valve body provided with a first through hole, and one end of the valve core is movably inserted into the valve body; a metering cavity provided with a second through hole, the second through hole is communicated with the chamber of the valve body and is opposite to the position of the first through hole; when the metered atomization device is in the initial state, the inner wall of the valve body closes the first concave cavity; when the valve core moves to the liquid inlet position, the first through hole, the first concave cavity and the second through hole are sequentially communicated to form a liquid inlet channel, and the liquid in the bag body flows into the metering cavity through the liquid inlet channel under the action of external force; when the valve core moves to the atomization position, the second through hole and the third through hole are communicated to form a liquid outlet channel, and the liquid in the metering cavity enters the valve core through the liquid outlet channel and then is atomized and ejected. In the bag-valve assembly of the present invention, the liquid inlet and atomization processes are completely separated, avoiding the state where the liquid inlet and spraying are carried out simultaneously.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a bag-valve assembly for a quantitative atomization device and a quantitative atomization device. Background Art

[0002] The method of administering drugs through oral and nasal inhalation is a drug administration method that requires the cooperation of a drug device and is an important drug administration route for treating various diseases including the lungs and the whole body. When using atomization for drug administration, the drug needs to be used in conjunction with a spraying device during inhalation. Good drug administration efficiency and treatment effect place higher requirements on the inhalation device.

[0003] Currently, the bag-valve atomization device has the advantages of being portable and ready-to-use. This atomization device forms a bag-valve structure through pre-filled liquid medicine and high-pressure gas. The built-in atomization chip atomizes the liquid medicine into fine drug aerosols for the treatment of upper respiratory diseases.

[0004] The patent with the application number 202121399318.3 makes improvements based on the existing bag-valve atomization device. By optimizing the atomization chip, the atomization particles are refined, and a metering valve is added to achieve quantitative drug administration of the atomization device. However, the metering valve of this atomization device is connected to the bag body. When the user triggers the liquid inlet by rotating the upper cover and forgets to press the button to stop the liquid inlet when the mist droplets start to spray out from the outlet, the liquid in the bag body will continuously enter the valve core through the metering valve. In this way, the atomization device is always in the spraying state, resulting in waste of liquid medicine and inaccurate liquid medicine dosage. Summary of the Invention

[0005] Based on the above defects in the prior art, the purpose of the present invention is to provide a bag-valve assembly for a quantitative atomization device, in which the liquid inlet channel and the liquid outlet channel do not interfere with each other, and the liquid inlet and atomization processes are completely separated, so as to avoid the situation that the quantitative atomization device is always in the state of simultaneous liquid inlet and spraying due to improper operation, resulting in unstable and inaccurate drug administration dosage and affecting the drug administration effect.

[0006] To this end, the present invention provides the following technical solutions.

[0007] The present invention provides a bag-valve assembly for a quantitative atomization device, and the bag-valve assembly includes:

[0008] A valve core, which is provided with a first cavity and a third through hole sequentially distributed along the axial direction;

[0009] A bag body, which is used to accommodate liquid;

[0010] A valve body, which is provided with a first through hole and one end of which extends into the bag body, and one end of the valve core is movably extended into the valve body and the two are in clearance fit;

[0011] A metering chamber, which is connected to the valve body and is provided with a second through hole, the second through hole is communicated with the chamber of the valve body and is opposite to the first through hole in position;

[0012] Wherein, when the quantitative atomizing device is in the initial state, the inner wall of the valve body closes the first concave cavity;

[0013] When the valve core moves to the liquid inlet position along the first direction in the axial direction of the valve core, the first through hole, the first concave cavity and the second through hole are sequentially communicated to form a liquid inlet channel, and the liquid in the bag body flows into the metering chamber through the liquid inlet channel under the extrusion of an external force;

[0014] When the valve core moves to the atomizing position along the second direction opposite to the first direction, the second through hole and the third through hole are communicated to form a liquid outlet channel, and the liquid in the metering chamber enters the valve core through the liquid outlet channel and then is atomized and ejected.

[0015] Preferably, the bag valve assembly further includes a valve core reset elastic member, which abuts against one end of the valve core;

[0016] Wherein, when the valve core moves along the first direction under an external force, the valve core reset elastic member is compressed; when the external force is removed, the valve core reset elastic member rebounds to drive the valve core to move along the second direction.

[0017] Preferably, the bag valve assembly further includes a tank body for accommodating compressed gas; the bag body is located in the tank body, the compressed gas is used to squeeze the bag body when the quantitative atomizing device is in the liquid inlet state, and the other end of the valve core is located outside the tank body.

[0018] Preferably, the first concave cavity is an annular concave cavity.

[0019] Preferably, the metering chamber includes:

[0020] A first partition plate, which is provided with a fourth through hole;

[0021] A second partition plate, which is provided with a fifth through hole; the first partition plate and the second partition plate are sequentially distributed along the direction towards the second through hole, and separate the metering chamber to form a first chamber, a second chamber and a third chamber;

[0022] A metering plate, which is movably located in the second chamber, and the peripheral side wall of the metering plate abuts against the inner wall of the second chamber;

[0023] A metering plate reset elastic member, one end of which is connected to the chamber wall of the first chamber and the other end is connected to the metering plate;

[0024] A pneumatic balance channel, which is respectively communicated with the first chamber and the outside;

[0025] Among them, when the metered atomization device is in the initial state, the metering plate reset elastic member passes through the fourth through hole and presses the metering plate against the second partition plate.

[0026] Preferably, a filter member is provided at the connection of the air pressure balance channel with the atmosphere.

[0027] Preferably, the bag valve assembly further includes a mounting seat for connecting and sealing the tank body and the bag body and for connecting and sealing the bag body and the valve body.

[0028] Preferably, a first limiting structure is provided inside the valve body for limiting the stopping position of the valve core when moving along the first direction.

[0029] Preferably, the mounting seat is provided with a second limiting structure for limiting the stopping position of the valve core when moving along the second direction.

[0030] The present invention also provides a metered atomization device, including the bag valve assembly for the metered atomization device as described above.

[0031] The present invention has the following technical effects:

[0032] The present invention provides a bag valve assembly for a metered atomization device. By providing a metering chamber to achieve metered atomization, through optimizing the structures of the liquid inlet channel and the liquid outlet channel of the bag valve assembly and separating the metering chamber from the bag body, when the metered atomization device is in the liquid inlet state, the liquid outlet channel is closed, and when the metered atomization device is in the atomization state, the liquid inlet channel is closed, so that the liquid inlet and atomization processes are completely separated, avoiding the situation that the metered atomization device is always in the state of simultaneous liquid inlet and spraying due to improper operation, which is convenient for drug administration.

[0033] The present invention provides a metered atomization device. The liquid inlet and atomization processes do not interfere with each other, avoiding the failure of the metering dose function caused by the situation that the metered atomization device is always in the state of simultaneous liquid inlet and spraying due to improper operation, and can improve the stability of drug administration, ensuring accurate metered drug administration. Description of the Drawings

[0034] Figure 1 is an exploded structural schematic diagram of the metered atomization device of the present invention;

[0035] Figure 2 is Figure 1 the enlarged view at A in

[0036] Figure 3 is a structural cross-sectional view of the metered atomization device of the present invention in the initial state;

[0037] Figure 4 is Figure 3Enlarged view at B in [the figure];

[0038] Figure 5 Structural sectional view of the quantitative atomization device of the present invention when in the liquid inlet state;

[0039] Figure 6 is Figure 5 Enlarged view at C in [the figure];

[0040] Figure 7 Structural sectional view of the quantitative atomization device of the present invention when in the atomization state;

[0041] Figure 8 is Figure 7 Enlarged view at D in [the figure].

[0042] Description of reference numerals

[0043] 100, quantitative atomization device;

[0044] 1, bag valve assembly;

[0045] 11, valve core; 111, first concave cavity; 112, third through hole; 12, valve core reset elastic member; 13, tank body; 14, bag body; 15, valve body; 151, first through hole; 152, first limiting structure; 16, metering cavity; 161, second through hole; 162, first partition board; 1621, fourth through hole; 163, second partition board; 1631, fifth through hole; 164, first chamber; 165, second chamber; 166, third chamber; 167, metering plate; 168, metering plate reset elastic member; 169, air pressure balance channel; 1691, filter element; 17, mounting seat; 171, second limiting structure; 18, atomization chip. Detailed implementation manners

[0046] To make the technical solutions and beneficial effects of the present invention more obvious and understandable, the following will be described in detail by way of listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0047] In the description of the present invention, unless otherwise clearly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of the simplified description of the present invention, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present invention.

[0048] In the present invention, the terms "first" and "second" are only used for the purpose of clear description, and cannot be construed as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" may clearly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two; the meaning of "several" is at least one; unless otherwise clearly defined.

[0049] In the present invention, unless otherwise clearly defined, the terms "mounted", "connected", "coupled", "fixed", "arranged", etc. shall be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection or an integral molding; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly defined, the first feature being "on", "above", "over" and "upon", "under", "beneath", "below" or "underneath" the second feature may be that the first feature and the second feature are in direct contact, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "upon" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", "below" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0051] Both "up" and "down" mentioned in the present invention are based on Figure 1 the indication in

[0052] The following will Figures 1 to 8 describe in detail the quantitative atomization device of the present invention according to

[0053] In this embodiment, as Figures 1 to 4As shown, the metered atomization device 100 includes a bag valve assembly 1. The bag valve assembly 1 includes a valve core 11, a bag body 14, a valve body 15, and a metering chamber 16. The valve core 11 is provided with a first concave cavity 111 and a third through hole 112 that are sequentially distributed along its axial direction. Among them, the outer wall of the valve core 11 is concaved to form the first concave cavity 111; the bag body 14 is used to hold liquid. The valve body 15 is provided with a first through hole 151 and one end of the valve body 15 extends into the bag body 14, and the first through hole 151 is located inside the bag body 14. One end of the valve core 11 is movably inserted into the valve body 15 and the two are in clearance fit. The metering chamber 16 is connected to the valve body 15 and is provided with a second through hole 161. The second through hole 161 communicates with the chamber of the valve body 15 and is opposite to the first through hole 151 in position.

[0054] As Figure 4 shown, when the metered atomization device 100 is in the initial state, the inner wall of the valve body 15 abuts against the contour at the opening of the first concave cavity 111 to close the first concave cavity 111, the inner wall of the valve core 11 closes the first through hole 151 of the valve body 15, the first through hole 151 and the first concave cavity 111 are in a non-connected state, and the liquid in the bag body 14 cannot enter the first concave cavity 111 through the first through hole 151 of the valve body 15, and thus cannot intake liquid. In addition, the third through hole 112 of the valve core 11 and the second through hole 161 of the metering chamber 16 are opposite in position and are in a connected state.

[0055] As Figure 6 shown, when the valve core 11 moves in the first direction along the axial direction of the valve core 11 to the liquid intake position, the first through hole 151, the first concave cavity 111, and the second through hole 161 are sequentially connected to form a liquid intake channel, the inner wall of the valve body 15 closes the third through hole 112 of the valve core 11, and the liquid in the bag body 14 flows into the metering chamber 16 through the liquid intake channel under the action of external force. At this time, the metered atomization device 100 is in the liquid intake state.

[0056] As Figure 8 shown, when the valve core 11 moves in the second direction opposite to the first direction to the atomization position, the second through hole 161 and the third through hole 112 are connected to form a liquid outlet channel, and the liquid in the metering chamber 16 enters the valve core 11 through the liquid outlet channel and then is atomized and ejected. At this time, the metered atomization device 100 is in the atomization state. It should be understood that the position of the valve core 11 is the same when the metered atomization device 100 is in the liquid intake state and the atomization state.

[0057] By adopting the above technical solution, quantitative atomization is achieved by setting the metering chamber 16. By optimizing the structures of the liquid inlet channel and the liquid outlet channel of the bag valve assembly 1 and separating the metering chamber 16 from the bag body 14, the liquid inlet channel and the liquid outlet channel do not interfere with each other. When the quantitative atomization device 100 is in the liquid inlet state, the liquid outlet channel is closed. When the quantitative atomization device 100 is in the atomization state, the liquid inlet channel is closed. The liquid inlet and atomization processes are completely separated, avoiding the situation that the quantitative atomization device is always in the state of simultaneous liquid inlet and spraying due to improper operation. In addition, the overall structure of the bag valve assembly 1 is simple and stable, and the operation processes of liquid inlet and atomization are simple.

[0058] As Figure 1 , Figure 4 and Figure 6 described, when the quantitative atomization device 100 is in the initial state, the first concave cavity 111 is located above the first through hole 151. In this way, the valve core 11 moves downward to trigger liquid inlet, and the valve core 11 moves upward to trigger atomization. Of course, when the quantitative atomization device 100 is in the initial state, the first concave cavity 111 can also be located below the first through hole 151. In this way, the valve core 11 moves upward to trigger liquid inlet, and the valve core 11 moves downward to trigger atomization.

[0059] In an embodiment, as Figure 1 and Figure 4 shown, the bag valve assembly 1 further includes a valve core reset elastic member 12, which abuts against one end of the valve core 11. When the valve core 11 moves along the first direction under an external force, the valve core reset elastic member 12 is compressed; when the external force is removed, the valve core reset elastic member 12 rebounds to drive the valve core 11 to move along the second direction, and the valve core reset elastic member 12 is used to reset the valve core 11.

[0060] Further, the valve core reset elastic member 12 abuts against one end of the valve core located inside the valve body 15. At this time, the first direction represents the direction towards the bag body 14.

[0061] Further, the valve core reset elastic member 12 is a spring, with a simple structure and convenient for assembly. Of course, the structure of the valve core reset elastic member 12 is not limited to this, and it can also be any other structure with elasticity and recovery ability.

[0062] It should be understood that the quantitative atomization device 100 can be provided with a trigger structure to trigger liquid inlet and atomization respectively. The trigger structure includes a trigger button and a driving component that can at least drive the valve core 11 to move along the first direction. The user presses the trigger button to trigger liquid inlet or trigger atomization. Specifically, when triggering liquid inlet, the driving component drives the valve core 11 to move along the first direction. When triggering atomization, the valve core 11 can be driven to move along the second direction by the driving component, or the valve core 11 can be driven to move along the second direction by the rebound of the valve core reset elastic member 12. Of course, the trigger structure can also not be provided, and the valve core 11 can be driven to move reciprocally manually by the user.

[0063] In one embodiment, as shown in Figure 1 and Figure 4 , the bag valve assembly 1 further includes a tank body 13 for accommodating compressed gas; a bag body 14 is located inside the tank body 13, and the compressed gas is used to squeeze the bag body 14 when the quantitative atomization device 100 is in the liquid inlet state. When the valve core 11 moves to the liquid inlet position, the first through hole 151, the first cavity 111, and the second through hole 161 are sequentially communicated to form a liquid inlet channel, and the compressed gas in the tank body 13 squeezes the bag body 14, so that the liquid in the bag body 14 enters the metering cavity 16 through the liquid inlet channel. The other end of the valve core 11 is located outside the tank body 13, and an external force acts on this end of the valve core 11 to drive the valve core 11 to move in the first direction or the second direction.

[0064] In one embodiment, as shown in Figure 4 , the aperture of the first through hole 151, the aperture of the second through hole 161, the aperture of the third through hole 112, and the height of the first cavity 111 are equal.

[0065] In one embodiment, as shown in Figure 4 , the distance between the center of the first cavity 111 of the valve core 11 and the center of the third through hole 112 is greater than or equal to the hole diameter of the third through hole 112, so as to avoid the situation where liquid enters and exits the metering cavity 16 simultaneously.

[0066] In one embodiment, the first cavity 111 is an annular cavity, which reduces the accuracy requirements for the assembly position of the valve core 11.

[0067] In one embodiment, as shown in Figure 4 , the metering cavity 16 includes a first partition plate 162, a second partition plate 163, a metering plate 167, a metering plate return elastic member 168, and a pneumatic balance channel 169. The first partition plate 162 is provided with a fourth through hole 1621, and the second partition plate 163 is provided with a fifth through hole 1631; the first partition plate 162 and the second partition plate 163 are sequentially distributed along the direction towards the second through hole 161, and the metering cavity 16 is divided to form a first chamber 164, a second chamber 165, and a third chamber 166. The metering plate 167 is movably located in the second chamber 165, and the peripheral side wall of the metering plate 167 abuts against the inner wall of the second chamber 165. One end of the metering plate return elastic member 168 is connected to the chamber wall of the first chamber 164, and the other end is connected to the metering plate 167. The pneumatic balance channel 169 is respectively communicated with the first chamber 164 and the outside, and the pneumatic balance channel 169 is used to balance the internal and external air pressures of the space on the side of the metering plate 167 facing the metering plate return elastic member 168 during the liquid inlet and atomization processes, so as to facilitate the smooth reciprocating movement of the metering plate 167.

[0068] As shown in Figure 4As shown, when the metering atomizing device 100 is in the initial state, the metering plate reset elastic member 168 passes through the fourth through hole 1621 and presses the metering plate 167 against the second partition plate 163, and the metering plate 167 closes the fifth through hole 1631 of the second partition plate 163. As Figure 6 As shown, when the metering atomizing device 100 is in the liquid inlet state, the liquid in the bag body 14 flows into the metering chamber 16 through the liquid inlet channel under the extrusion of the compressed gas in the tank body 13. The liquid pushes the metering plate 167 to move towards the first partition plate 162 and the metering plate reset elastic member 168 is compressed until the metering plate 167 abuts against the first partition plate 162, completing the liquid inlet. During this process, the air in the space on the side of the metering plate 167 facing the metering plate reset elastic member 168 is discharged to the outside through the air pressure balance channel 169.

[0069] As Figure 8 As shown, when the metering atomizing device 100 is in the atomizing state, the second through hole 161 and the third through hole 112 are communicated to form a liquid outlet channel. The metering plate reset elastic member 168 rebounds and pushes the metering plate 167 to move towards the second partition plate 163, squeezing the liquid in the metering chamber 16 into the valve core 11 until the metering plate 167 abuts against the second partition plate 163, completing the atomization. During this process, the outside air enters the space on the side of the metering plate 167 facing the metering plate reset elastic member 168 through the air pressure balance channel 169. The volume of the space of the second chamber 165 between the first partition plate 162 and the second partition plate 163 corresponds to the liquid inlet volume and the atomization volume, and the size of the space of the second chamber 165 is adjusted to match different drug administration requirements.

[0070] Furthermore, as Figure 2 As shown, a filter member 1691 is provided at the connection between the air pressure balance channel 169 and the atmosphere to filter the air entering the air pressure balance channel 169 from the outside, preventing impurities from entering the metering chamber 16 and affecting the movement of the metering plate 167.

[0071] It should be understood that the pressure in the tank body 13 is greater than the pressure required for the metering plate 167 to move from the second partition plate 163 to the first partition plate 162, so as to facilitate the smooth realization of liquid inlet.

[0072] It should be understood that before the metering atomizing device 100 is used, it is necessary to repeat the liquid inlet and atomization several times to discharge the air in the valve core 11 and the metering chamber 16. This operation can be completed before leaving the factory or the user can be guided to complete it after leaving the factory.

[0073] It should be understood that as Figure 6As shown, after the liquid injection is completed, the second chamber 165 and the third chamber 166 are filled with liquid. Since the volume of the liquid ejected during atomization is equal to the volume of the liquid in the second chamber 165, when the atomization is completed, at least part of the liquid in the third chamber 166 remains in the valve core 11. Until after multiple liquid injections and atomizations, when the quantitative atomization device 100 is in the initial state, the liquid level in the valve core 11 is equal to the liquid level in the third chamber 166, and the residual liquid in the valve core 11 maintains a stable liquid level.

[0074] In the above technical solution, the overall structure of the metering chamber 16 is simple, and it can cooperate with the metering plate reset elastic member 168 through the metering plate 167 to achieve instantaneous liquid injection and instantaneous atomization.

[0075] In one embodiment, as Figure 1 and Figure 3 shown, the bag valve assembly 1 further includes a mounting seat 17 for connecting and sealing the tank body 13 and the bag body 14 and for connecting and sealing the bag body 14 and the valve body 15.

[0076] Furthermore, as Figure 3 shown, the valve body 15 is provided with a first limiting structure 152 for restricting the stopping position of the valve core 11 when moving in the first direction, that is, restricting the liquid injection position of the valve core 11. Specifically, the first limiting structure 152 is an annular protrusion. When the liquid injection is triggered, the valve core 11 moves in the first direction, and at the same time, the valve core reset elastic member 12 is compressed. The valve core 11 moves until it abuts against the first limiting structure 152 and stops moving.

[0077] Furthermore, as Figure 3 and Figure 4 shown, the mounting seat 17 is provided with a second limiting structure 171 for restricting the stopping position of the valve core 11 when moving in the second direction, that is, the second limiting structure 171 is used to restrict the initial position of the valve core 11. When the atomization is triggered, the valve core reset elastic member 12 rebounds and passes through the first limiting structure 152 to push the valve core 11 to move in the reverse direction. The valve core 11 moves until it abuts against the second limiting structure 171 and stops moving. At this time, the quantitative atomization device 100 returns to the initial state.

[0078] Furthermore, as Figure 3 and Figure 4 shown, the valve core reset elastic member 12 is located inside the valve body 15, which is convenient for assembly.

[0079] In one embodiment, as Figure 4 shown, the bag valve assembly 1 further includes an atomization chip 18, which is arranged at the outlet end of the valve core 11 to convert the liquid ejected from the valve core 11 into an aerosol.

[0080] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can be made on the basis of the above embodiments. Similarly, the technical features of the above embodiments can be arbitrarily combined to form additional embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only represent several implementation manners of the present invention and do not limit the protection scope of the present invention patent.

Claims

1. A bag-valve assembly for a metered-dose inhalation device, characterized in that, The bag valve assembly (1) includes: A valve core (11) provided with a first concave cavity (111) and a third through hole (112) distributed axially in sequence; A bag body (14) for containing liquid; A valve body (15) provided with a first through hole (151) and one end of which extends into the bag body (14), and one end of the valve core (11) is movably inserted into the valve body (15) with a clearance fit therebetween; A metering cavity (16) connected to the valve body (15) and provided with a second through hole (161), the second through hole (161) is communicated with the chamber of the valve body (15) and is opposite to the first through hole (151) in position; Wherein, when the quantitative atomization device (100) is in the initial state, the inner wall of the valve body (15) closes the first concave cavity (111); When the valve core (11) moves to the liquid inlet position along a first direction in the axial direction of the valve core (11), the first through hole (151), the first concave cavity (111) and the second through hole (161) are sequentially communicated to form a liquid inlet channel, and the liquid in the bag body (14) flows into the metering cavity (16) through the liquid inlet channel under the extrusion of an external force; When the valve core (11) moves to the atomization position along a second direction opposite to the first direction, the second through hole (161) and the third through hole (112) are communicated to form a liquid outlet channel, and the liquid in the metering cavity (16) enters the valve core (11) through the liquid outlet channel and then is atomized and ejected; The bag valve assembly (1) further includes an atomization chip (18) disposed at the outlet end of the valve core (11) to convert the liquid ejected from the valve core (11) into aerosol.

2. The bag-valve assembly for a metered-dose inhalation device according to claim 1, characterized in that, The bag valve assembly (1) further includes a valve core return elastic member (12) abutted against one end of the valve core (11); Wherein, when the valve core (11) moves along the first direction under an external force, the valve core return elastic member (12) is compressed; when the external force is removed, the valve core return elastic member (12) rebounds to drive the valve core (11) to move along the second direction.

3. The bag-valve assembly for a metered-dose inhalation device according to claim 1, characterized in that, The bag valve assembly (1) further includes a tank body (13) for containing compressed gas; the bag body (14) is located inside the tank body (13), and the compressed gas is used to squeeze the bag body (14) when the quantitative atomization device (100) is in the liquid inlet state, and the other end of the valve core (11) is located outside the tank body (13).

4. The bag-valve assembly for a metered-dose inhalation device according to claim 1, characterized in that, The first concave cavity (111) is an annular concave cavity.

5. The bag-valve assembly for a metered-dose inhalation device according to claim 1, characterized in that, The metering cavity (16) includes: A first partition plate (162) provided with a fourth through hole (1621); A second partition plate (163) provided with a fifth through hole (1631); the first partition plate (162) and the second partition plate (163) are sequentially distributed along the direction towards the second through hole (161), and partition the metering cavity (16) to form a first chamber (164), a second chamber (165) and a third chamber (166); A metering plate (167) movably located within the second chamber (165), and a peripheral side wall of the metering plate (167) abuts against an inner wall of the second chamber (165); A metering plate return elastic member (168) having one end connected to a chamber wall of the first chamber (164) and the other end connected to the metering plate (167); An air pressure balance passage (169) respectively communicating with the first chamber (164) and the outside; Wherein, when the metering atomizing device (100) is in an initial state, the metering plate return elastic member (168) passes through the fourth through hole (1621) and presses the metering plate (167) against the second partition plate (163).

6. The bag-valve assembly for a metered-dose inhalation device according to claim 5, characterized in that, A filter member (1691) is provided at a connection portion of the air pressure balance passage (169) and the atmosphere.

7. The bag-valve assembly for a metered-dose inhalation device according to claim 3, characterized in that, The bag valve assembly (1) further includes a mounting seat (17) for connecting and sealing the tank body (13) and the bag body (14) and for connecting and sealing the bag body (14) and the valve body (15).

8. The bag-valve assembly for a metered-dose inhalation device according to claim 1, characterized in that, A first limiting structure (152) is provided within the valve body (15) for limiting a stopping position of the valve core (11) when moving along the first direction.

9. The bag-valve assembly for a metered-dose inhalation device according to claim 7, characterized in that, The mounting seat (17) is provided with a second limiting structure (171) for limiting a stopping position of the valve core (11) when moving along the second direction.

10. A metered-dose inhalation device, characterized in that, Comprising a bag valve assembly for a metering atomizing device according to any one of claims 1-9.

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