CN116115868A - Bag valve assembly for quantitative atomization device and quantitative atomization device - Google Patents

Abstract

The invention relates to a bag valve assembly for a quantitative atomization device and the quantitative atomization device, wherein the bag valve assembly comprises a valve core, a first concave cavity and a third through hole; a bag body; the valve body is provided with a first through hole, and one end of the valve core movably stretches into the valve body; the metering cavity is provided with a second through hole which is communicated with the cavity of the valve body and is opposite to the first through hole in position; when the quantitative atomization device is in an initial state, the inner wall of the valve body seals the first concave cavity; when the valve core moves to a 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 liquid in the bag body flows into the metering cavity through the liquid inlet channel under external force extrusion; when the valve core moves to the atomizing position, the second through hole and the third through hole are communicated to form a liquid outlet channel, and liquid in the metering cavity enters the valve core through the liquid outlet channel and is atomized and sprayed out. According to the bag valve assembly, two processes of liquid feeding and atomization are completely separated, so that the state that liquid feeding and atomization are carried out simultaneously is avoided.

Description

Bag valve assembly for quantitative atomization device and quantitative atomization device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a bag valve assembly for a quantitative atomization device and the quantitative atomization device.

Background

The oral-nasal inhalation administration is an administration mode requiring the coordination of a medicine instrument, and is an important administration way for treating various diseases including lung and whole body. When the medicine is used for atomization administration, the medicine is required to be matched with a spraying device for use in the inhalation process, and high requirements are put on the inhalation device by good medicine administration efficiency and treatment effect.

At present, the bag valve type atomizing device has the advantages of portability and instant use, the bag valve structure is formed by prefilling liquid medicine and high-pressure air, and the built-in atomizing chip atomizes the liquid medicine into fine medicine aerosol for treating upper respiratory diseases.

The patent with the application number of 202121399318.3 is improved based on the existing bag valve type atomizing device, atomized particles are thinned by optimizing an atomizing chip, and a metering valve is added, so that quantitative administration of the atomizing device is realized. But this atomizing device's metering valve and bag body intercommunication, when the user trigger the feed liquor through rotatory upper cover and wait that the export begins to spout the fog drip the time the user forget to press the button in order to stop the feed liquor, liquid in the bag body can always get into in the case through the metering valve, like this, atomizing device is in the spraying state always, causes the liquid medicine extravagant and the inaccuracy of liquid medicine dosage.

Disclosure of Invention

Based on the above-mentioned drawbacks in the prior art, the present invention aims to provide a bag valve assembly for a quantitative atomization device, in which a liquid inlet channel and a liquid outlet channel are not interfered with each other, and the liquid inlet process and the liquid outlet process are completely separated, so as to avoid unstable and accurate dosing and influence on the dosing effect caused by that the quantitative atomization device is always in a state that liquid inlet and spraying are performed simultaneously due to improper operation.

Therefore, the invention provides the following technical scheme.

The present invention provides a bag valve assembly for a quantitative atomizing device, the bag valve assembly comprising:

the valve core is provided with a first concave cavity and a third through hole which are sequentially distributed along the axial direction;

a bag body for containing a liquid;

the valve body is provided with a first through hole, one end of the valve body extends into the bag body, and one end of the valve core movably extends into the valve body and is in clearance fit with the valve body;

the metering cavity is connected to the valve body and provided with a second through hole, and the second through hole is communicated with the cavity of the valve body and is opposite to the first through hole in position;

when the quantitative atomization device is in an initial state, the inner wall of the valve body seals the first concave cavity;

when the valve core moves to a liquid inlet position along a 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 liquid in the bag body flows into the metering cavity through the liquid inlet channel under the extrusion of external force;

when the valve core moves to an atomization position along a 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 liquid in the metering cavity enters the valve core through the liquid outlet channel and is atomized and sprayed out.

Preferably, the bag valve assembly further comprises a valve core resetting elastic piece which is abutted against one end of the valve core;

when the valve core moves along a first direction under external force, the valve core resetting elastic piece is compressed; when the external force is removed, the valve core reset elastic piece rebounds to drive the valve core to move along the second direction.

Preferably, the bag valve assembly further comprises a canister to contain compressed gas; the bag body is positioned in the tank body, the compressed gas is used for extruding the bag body when the quantitative atomization device is in a liquid inlet state, and the other end of the valve core is positioned outside the tank body.

Preferably, the first cavity is an annular cavity.

Preferably, the metering chamber comprises:

a first separator provided with a fourth through hole;

a second separator provided with a fifth through hole; the first partition plate and the second partition plate are sequentially distributed along the direction facing the second through hole and separate the metering cavity to form a first cavity, a second cavity and a third cavity;

a metering plate movably positioned in the second chamber, and the peripheral side wall of the metering plate is abutted against the inner wall of the second chamber;

one end of the metering plate reset elastic piece is connected with the cavity wall of the first cavity, and the other end of the metering plate reset elastic piece is connected with the metering plate;

the air pressure balance channel is respectively communicated with the first chamber and the outside;

when the quantitative atomization device is in an initial state, the metering plate reset elastic piece penetrates through the fourth through hole and presses the metering plate against the second partition plate.

Preferably, a filter is arranged at the communication part of the air pressure balancing channel and the atmosphere.

Preferably, the bag valve assembly further comprises a mounting seat for connecting and sealing the canister and the bag and for connecting and sealing the bag and the valve body.

Preferably, a first limiting structure is arranged in the valve body and used for limiting the stop position of the valve core when the valve core moves along the first direction.

Preferably, the mounting seat is provided with a second limiting structure for limiting a stop position of the valve core when the valve core moves along the second direction.

The invention also provides a quantitative atomizing device comprising a bag valve assembly for a quantitative atomizing device as described above.

The invention has the following technical effects:

the invention provides a bag valve assembly for a quantitative atomization device, which is characterized in that a metering cavity is arranged to realize quantitative atomization, a liquid inlet channel and a liquid outlet channel of the bag valve assembly are optimized, and the metering cavity and a bag body are arranged in a separated mode, so that the liquid outlet channel is closed when the quantitative atomization device is in a liquid inlet state, and the liquid inlet channel is closed when the quantitative atomization device is in an atomization state, so that the liquid inlet process and the liquid atomization process are completely separated, the quantitative atomization device is prevented from being in a state that liquid inlet and liquid spraying are carried out simultaneously all the time due to improper operation, and the dosing is convenient.

The invention provides a quantitative atomization device, wherein the liquid feeding process and the atomization process are not interfered with each other, so that the functional failure of quantitative dosage caused by the fact that the quantitative atomization device is always in a state of simultaneous liquid feeding and spraying due to improper operation is avoided, the stability of drug delivery can be improved, and accurate metering drug delivery can be realized.

Drawings

FIG. 1 is a schematic diagram of an explosive structure of a quantitative atomizing device of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a cross-sectional view showing the structure of the quantitative atomizing apparatus of the present invention in an initial state;

FIG. 4 is an enlarged view of FIG. 3 at B;

FIG. 5 is a cross-sectional view of the quantitative atomizing apparatus of the present invention in a liquid feed state;

FIG. 6 is an enlarged view of FIG. 5 at C;

FIG. 7 is a cross-sectional view showing the structure of the quantitative atomizing apparatus of the present invention in an atomized state;

fig. 8 is an enlarged view of D in fig. 7.

Description of the reference numerals

100. A quantitative atomizing device;

1. a bag valve assembly;

11. a valve core; 111. a first cavity; 112. a third through hole; 12. a valve core resetting elastic piece; 13. a tank body; 14. a bag body; 15. a valve body; 151. a first through hole; 152. a first limit structure; 16. a metering chamber; 161. a second through hole; 162. a first separator; 1621. a fourth through hole; 163. a second separator; 1631. a fifth through hole; 164. a first chamber; 165. a second chamber; 166. a third chamber; 167. a metering plate; 168. resetting the elastic piece of the metering plate; 169. an air pressure balancing channel; 1691. a filter; 17. a mounting base; 171. a second limit structure; 18. and atomizing the chip.

Detailed Description

In order to make the technical scheme and the beneficial effects of the invention more obvious and understandable, the following detailed description is given by way of example. Unless defined otherwise, technical and scientific terms used herein have the same meaning as technical and scientific terms in the technical field to which this application belongs.

In the description of the present invention, unless explicitly defined otherwise, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience of simplifying the description of the present invention, and do not indicate that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, i.e., are not to be construed as limiting the present invention.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as relative importance of the features indicated or the number of technical features indicated. Thus, a feature defining "first", "second" may explicitly include at least one such feature. In the description of the present invention, "plurality" means at least two; "plurality" means at least one; unless otherwise specifically defined.

In the present invention, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly, unless otherwise specifically limited. For example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, or can be communicated between two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless explicitly defined otherwise, a first feature "on", "above", "over" and "above", "below" or "under" a second feature may be that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact via an intermediary. Moreover, a first feature "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the level of the first feature is higher than the level of the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the level of the first feature is less than the level of the second feature.

The references to "upper" and "lower" in this invention are both made to the designation in fig. 1.

The quantitative atomizing device of the present invention will be described in detail with reference to fig. 1 to 8.

In the present embodiment, as shown in fig. 1 to 4, the quantitative atomizing apparatus 100 includes a bag valve assembly 1, and the bag valve assembly 1 includes a valve cartridge 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 which are sequentially distributed along the axial direction of the valve core, wherein the outer wall of the valve core 11 is concave inwards to form the first concave cavity 111; the bag 14 is for containing a 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 positioned in 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 being in communication with the chamber of the valve body 15 and being located opposite to the first through hole 151.

As shown in fig. 4, when the quantitative atomizing device 100 is in the initial state, the inner wall of the valve body 15 abuts against the outline of the opening of the first cavity 111 to close the first 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 cavity 111 are in an unconnected state, and the liquid in the bag 14 cannot enter the first cavity 111 through the first through hole 151 of the valve body 15, so that liquid cannot enter. Further, the third through hole 112 of the spool 11 and the second through hole 161 of the metering chamber 16 are located opposite to each other, and both are in a communicating state.

As shown in fig. 6, when the valve core 11 moves to the liquid inlet position along the 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, 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 inlet channel under the condition of external force extrusion, and at this time, the quantitative atomization device 100 is in a liquid inlet state.

As shown in fig. 8, when the valve body 11 moves to the atomizing position in the 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 passage, and the liquid in the metering chamber 16 enters the valve body 11 through the liquid outlet passage and is atomized and ejected, and at this time, the quantitative atomizing device 100 is in an atomized state. It should be appreciated that the position of the valve spool 11 is the same in both the liquid feed state and the atomized state of the quantitative atomizing device 100.

Through adopting above-mentioned technical scheme, through setting up measurement chamber 16 in order to realize quantitative atomizing, through optimizing the structure of the feed liquor passageway and the drain passageway of bag valve assembly 1 and separating measurement chamber 16 and bag body 14 and set up, make feed liquor passageway and drain passageway noninterference each other, the drain passageway is closed when quantitative atomizing device 100 is in the feed liquor, feed liquor passageway is closed when quantitative atomizing device 100 is in the atomizing state, feed liquor and two processes of atomizing are carried out completely separately, avoid making quantitative atomizing device be in the state that feed liquor and spraying go on simultaneously always because of the improper operation, in addition, bag valve assembly 1 overall structure is simple and stable, feed liquor and atomizing running process are simple.

As shown in fig. 1, 4 and 6, when the quantitative atomizing device 100 is in the initial state, the first cavity 111 is located above the first through hole 151, so that the valve core 11 moves downward to trigger the liquid feeding, and the valve core 11 moves upward to trigger the atomization. Of course, the first cavity 111 may also be located below the first through hole 151 when the quantitative atomization device 100 is in the initial state, such that the valve core 11 moves upward to trigger the liquid feeding, and the valve core 11 moves downward to trigger the atomization.

In one embodiment, as shown in fig. 1 and 4, the bag valve assembly 1 further includes a spool return elastic member 12 abutting against one end of the spool 11. When the spool 11 moves in the first direction under an external force, the spool return elastic member 12 is compressed; when the external force is removed, the valve core resetting elastic piece 12 rebounds to drive the valve core 11 to move along the second direction, and the valve core resetting elastic piece 12 is used for resetting the valve core 11.

Further, the valve element return elastic member 12 abuts against one end of the valve element located in the valve body 15, and at this time, the first direction indicates a direction toward the bag body 14.

Further, the valve core resetting elastic member 12 is a spring, and has a simple structure and is convenient to assemble. Of course, the structure of the valve element return elastic member 12 is not limited to this, and any other structure having elasticity and return ability may be used.

It should be appreciated that the quantitative nebulizing device 100 may be provided with a trigger structure to trigger the liquid feeding and nebulization, respectively, the trigger structure comprising a trigger button and a drive assembly capable of driving at least the valve core 11 to move in the first direction, the user triggering the liquid feeding or the nebulization by pressing the trigger button. Specifically, when the liquid inlet is triggered, the driving assembly drives the valve core 11 to move along the first direction. When atomization is triggered, the valve core 11 can be driven to move along the second direction through the driving component, and the valve core 11 can also be made to move along the second direction through rebound of the valve core reset elastic piece 12. Of course, the trigger structure may not be provided, and the user may manually drive the valve element 11 to reciprocate.

In one embodiment, as shown in fig. 1 and 4, the bag valve assembly 1 further includes a tank 13 for containing compressed gas; the bag 14 is located in the tank 13, and the compressed gas is used to squeeze the bag 14 when the quantitative atomization device 100 is in a liquid inlet state. When the valve core 11 moves to the liquid inlet position, 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 compressed gas in the tank 13 presses the bag 14, so that liquid in the bag 14 enters the metering cavity 16 through the liquid inlet channel. The other end of the valve core 11 is located outside the can 13, and an external force acts on the end of the valve core 11 to drive the valve core 11 to move in the first direction or the second direction.

In one embodiment, as shown in fig. 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.

In an embodiment, as shown in fig. 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 that the liquid inlet and the liquid outlet of the metering cavity 16 are performed simultaneously.

In one embodiment, the first cavity 111 is an annular cavity, reducing the accuracy requirements for the mounting position of the spool 11.

In one embodiment, as shown in FIG. 4, the metering chamber 16 includes a first diaphragm 162, a second diaphragm 163, a metering plate 167, a metering plate return spring 168, and a pneumatic balance channel 169. The first partition 162 is provided with a fourth through hole 1621, and the second partition 163 is provided with a fifth through hole 1631; the first partition 162 and the second partition 163 are sequentially distributed in a direction toward the second through hole 161, and partition the metering chamber 16 to form a first chamber 164, a second chamber 165, and a third chamber 166. The metering plate 167 is movably located within the second chamber 165, and the peripheral side wall of the metering plate 167 abuts the inner wall of the second chamber 165. The metering plate return spring 168 is connected at one end to the wall of the first chamber 164 and at the other end to the metering plate 167. The air pressure balancing channel 169 is respectively communicated with the first chamber 164 and the outside, and the air pressure balancing channel 169 is used for balancing the internal and external air pressure of the space of the metering plate 167 facing one side of the metering plate return elastic member 168 in the liquid feeding and atomizing process, so that the metering plate 167 can smoothly reciprocate.

As shown in fig. 4, when the metering device 100 is in the 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 163, and the metering plate 167 closes the fifth through hole 1631 of the second partition 163. As shown in fig. 6, when the quantitative atomizing device 100 is in the liquid-feeding state, the liquid in the bag 14 flows into the metering chamber 16 through the liquid-feeding passage under the extrusion of the compressed gas in the tank 13, the liquid pushes the metering plate 167 to move toward the first partition 162 and the metering plate return elastic member 168 is compressed until the metering plate 167 abuts against the first partition 162, and the liquid feeding is completed, and in this process, the air in the space of the metering plate 167 on the side facing the metering plate return elastic member 168 is discharged to the outside through the air pressure balance passage 169.

As shown in fig. 8, when the quantitative atomizing device 100 is in an atomized state, the second through hole 161 and the third through hole 112 are communicated to form a liquid outlet channel, the metering plate return elastic member 168 rebounds and pushes the metering plate 167 to move toward the second partition plate 163, so that the liquid in the metering chamber 16 is extruded into the valve core 11 until the metering plate 167 abuts against the second partition plate 163, and atomization is completed, and in this process, the outside air enters into the space of the metering plate 167 toward one side of the metering plate return elastic member 168 through the air pressure balance channel 169. The volume of the space of the second chamber 165 between the first partition 162 and the second partition 163 corresponds to the amount of intake fluid and the amount of atomization, and the size of the space of the second chamber 165 is adjusted to match different dosing requirements.

Further, as shown in fig. 2, a filter 1691 is disposed at the connection between the air pressure balancing channel 169 and the atmosphere to filter the air entering the air pressure balancing channel 169 from the outside, so as to prevent the impurity from entering the metering chamber 16 and affecting the movement of the metering plate 167.

It should be appreciated that the pressure within the canister 13 is greater than the pressure required by the metering plate 167 to move from the second baffle 163 to the first baffle 162 in order to facilitate fluid intake.

It should be appreciated that the metered dose atomizing device 100 requires several iterations of feeding and atomizing prior to use to expel air from the valve cartridge 11 and metering chamber 16, which may be done prior to shipment or after shipment to guide the user.

It should be understood that, as shown in fig. 6, since the second chamber 165 and the third chamber 166 are filled with liquid after the liquid feeding is completed and the volume of the liquid ejected during atomization is equal to the volume of the liquid in the second chamber 165, after the atomization is completed, the liquid in the third chamber 166 remains at least partially in the valve core 11 until the liquid level in the valve core 11 is equal to the liquid level in the third chamber 166 when the quantitative atomization device 100 is in the initial state after multiple liquid feeding and atomization, and the remaining liquid in the valve core 11 maintains a stable liquid level.

In the above technical solution, the whole structure of the metering chamber 16 is simple, and the metering chamber can realize instantaneous liquid feeding and instantaneous atomization by matching the metering plate reset elastic member 168 with the metering plate 167.

In one embodiment, as shown in fig. 1 and 3, the bag-valve assembly 1 further includes a mounting seat 17 for connecting and sealing the canister 13 and the bag 14 and for connecting and sealing the bag 14 and the valve body 15.

Further, as shown in fig. 3, a first limiting structure 152 is disposed in the valve body 15, and is used for limiting the stop position of the valve core 11 when moving along the first direction, that is, limiting the liquid inlet position of the valve core 11. Specifically, the first limiting structure 152 is an annular protrusion, when the liquid inlet is triggered, the valve core 11 moves along the first direction, and the valve core resetting elastic member 12 is compressed, so that the valve core 11 moves to abut against the first limiting structure 152 to stop moving.

Further, as shown in fig. 3 and 4, the mounting seat 17 is provided with a second limiting structure 171 for limiting the stop position of the valve element 11 when moving in the second direction, that is, the second limiting structure 171 is used for limiting the initial position of the valve element 11. When the atomization is triggered, the valve core resetting elastic member 12 rebounds and passes through the first limiting structure 152 to push the valve core 11 to move reversely, the valve core 11 moves to abut against the second limiting structure 171 to stop moving, and at this time, the quantitative atomization device 100 is restored to the initial state.

Further, as shown in fig. 3 and 4, the spool return elastic member 12 is located in the valve body 15 to facilitate assembly.

In one embodiment, as shown in fig. 4, the bag valve assembly 1 further includes an atomizing chip 18 disposed at the outlet end of the valve cartridge 11 to convert the liquid ejected from the valve cartridge 11 into aerosol.

It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the invention which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims (10)

1. A bag valve assembly for a metered dose atomizing device, characterized in that the bag valve assembly (1) comprises:

the valve core (11) is provided with a first concave cavity (111) and a third through hole (112) which are sequentially distributed along the axial direction;

a bag (14) for containing a liquid;

the valve body (15) is provided with a first through hole (151) and one end of the valve body extends into the bag body (14), and one end of the valve core (11) movably extends into the valve body (15) and is in clearance fit with the valve body;

a metering chamber (16) connected to the valve body (15) and provided with a second through hole (161), the second through hole (161) being in communication with the chamber of the valve body (15) and being located opposite to the first through hole (151);

wherein when the quantitative atomizing device (100) is in an initial state, the inner wall of the valve body (15) seals the first concave cavity (111);

when the valve core (11) moves to a 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 liquid in the bag body (14) flows into the metering cavity (16) through the liquid inlet channel under the extrusion of external force;

when the valve core (11) moves to an 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 liquid in the metering cavity (16) enters the valve core (11) through the liquid outlet channel and is atomized and sprayed out.

2. A bag valve assembly for a metered dose atomizing device according to claim 1, characterized in that said bag valve assembly (1) further comprises a valve cartridge return spring (12) abutting against one end of said valve cartridge (11);

wherein, when the valve core (11) moves along a first direction under an external force, the valve core resetting elastic piece (12) is compressed; when the external force is removed, the valve core reset elastic piece (12) rebounds to drive the valve core (11) to move along the second direction.

3. A bag valve assembly for a metered dose atomizing device according to claim 1, characterized in that said bag valve assembly (1) further comprises a canister (13) for containing a compressed gas; the bag body (14) is positioned in the tank body (13), the compressed gas is used for extruding the bag body (14) when the quantitative atomization device (100) is in a liquid inlet state, and the other end of the valve core (11) is positioned outside the tank body (13).

4. A bag valve assembly for a metered dose atomizing device according to claim 1, characterized in that said first cavity (111) is an annular cavity.

5. A bag valve assembly for a metered dose atomizing device according to claim 1, characterized in that said metering chamber (16) comprises:

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 divide the metering cavity (16) to form a first cavity (164), a second cavity (165) and a third cavity (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 spring (168) having one end connected to a wall of the first chamber (164) and the other end connected to the metering plate (167);

an air pressure balance passage (169) which communicates with the first chamber (164) and the outside, respectively;

wherein, when the quantitative atomization 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 (163) against the second partition plate (163).

6. A bag valve assembly for a metered dose atomizing device according to claim 5, characterized in that said air pressure equalization passage (169) is provided with a filter (1691) in communication with the atmosphere.

7. A bag valve assembly for a metered dose atomizing device according to claim 3, characterized in that said bag valve assembly (1) further comprises a mounting seat (17) for connecting and sealing said canister (13) and said bag (14) and for connecting and sealing said bag (14) and said valve body (15).

8. A bag valve assembly for a metered dose atomizing device according to claim 1, characterized in that said valve body (15) has a first limiting structure (152) disposed therein for limiting a stop position of said valve cartridge (11) when moving in said first direction.

9. A bag valve assembly for a metered dose atomizing device according to claim 7, characterized in that said mounting seat (17) is provided with a second limiting structure (171) for limiting a stop position of said valve cartridge (11) when moving in said second direction.

10. A metered dose aerosolization device comprising a bag valve assembly for a metered dose aerosolization device as claimed in any one of claims 1 to 9.

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