Quantitative valve structure and aerosol

Abstract

The present application provides a dosing valve structure, which comprises a valve chamber and a valve stem assembly. The valve chamber has a dosing cavity, one end of which is provided with a material inlet, and the other end of which has an opening part and is provided with a mounting groove for mounting a sealing member, the sealing member being mounted in the mounting groove and covering the opening part. The valve stem assembly comprises a valve core, an elastic member and a valve stem member, the valve core being elastically mounted in the dosing cavity by the elastic member to be axially movable to abut against the sealing member or block the material inlet. One end of the valve stem member penetrates through the sealing member and extends into the valve core, the valve stem member being hollow and having a feeding gap with the valve core for feeding. The valve stem member is pressed to push the valve core away from the sealing member to form a feeding area between the valve core and the sealing member for the material to enter the valve core, and one end of the valve core blocks the material inlet. The material in the dosing cavity enters the valve stem member through the feeding area and the feeding gap and is discharged. The present application also provides an aerosol with the above-mentioned dosing valve structure.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol products, and in particular to a metered dose valve structure and an aerosol. Background Art

[0002] Aerosol products are products that contain a sealed, valved container with a volume of no more than 1 liter. During use, the contents are released in a predetermined form under the pressure of a propellant. These products are administered as a spray, and the sprayed substance can be solid, liquid, or gaseous, and the spray form can be classified as mist, foam, powder, or micelles. An aerosol valve is a sealed mechanical device fixed to the aerosol container. When closed, it prevents leakage of the contents. When actuated, it allows the contents to be ejected through an actuator in a predetermined form and velocity. In the non-operating state, the valve is closed under the pressure of a spring. In the operating state, when the actuator is pressed, the valve stem moves downward, freeing the flow orifice from the sealing ring. The contents are then ejected through the inlet tube, the flow orifice, the mixing chamber, and finally the actuator's spray orifice. The spring pushes the valve stem back, closing the valve again. In certain situations, the valve requires metered delivery to prevent under- or over-dosage.

[0003] The metering valve has a valve chamber for metering inside the container. One end of the valve stem extends outside the container, and the other end of the valve stem is placed inside the container and located within the valve chamber. In the prior art, the valve stem has a material outlet and a material inlet. When not in use, the material outlet and the material inlet are both opened at the end of the valve stem located outside the container. During use, the valve stem is pressed, allowing the material inlet to enter the valve chamber. The material in the valve chamber is released from the material outlet of the valve stem through the material inlet. After the injection is completed, the valve stem is released, and the material inlet is reset to the outside of the container. The material in the valve chamber will no longer be ejected. At this time, the valve chamber is replenished with material. However, the material in the valve stem will be discharged from the outer end of the container through the material inlet, causing leakage, affecting the appearance and user experience.

[0004] Therefore, it is necessary to provide a quantitative valve structure that can release materials in a quantitative manner and prevent leakage after the material is released. Summary of the Invention

[0005] The object of the present invention is to provide a quantitative valve structure which can release materials in a quantitative manner and prevent leakage after the materials are released.

[0006] Another object of the present invention is to provide an aerosol having the above-mentioned metered dose valve structure.

[0007] To achieve the above object, the present invention provides a quantitative valve structure, comprising:

[0008] The valve chamber has a quantitative cavity, one end of which is provided with a feed port for material to enter, and the other end of which has an opening and a mounting groove for mounting a seal, the seal being mounted in the mounting groove and covering the opening;

[0009] The valve stem assembly includes a valve core, an elastic member and a valve stem member. The valve core is elastically installed in the metering chamber by the elastic member so that it can move axially to abut against the seal or block the feed port; one end of the valve stem member passes through the seal and extends into the valve core. The valve stem member is hollow and there is a feeding gap between the valve stem and the valve core for feeding; the valve stem member is pressed to push the valve core out of the seal to form a feeding area between the valve core and the seal for material to enter the valve core. The feeding area is annularly arranged on the top of the valve core, and one end of the valve core blocks the feed port; the material in the metering chamber passes through the feeding area and then through the feeding gap into the valve stem member and is discharged.

[0010] After adopting the above technical solution, the metering valve structure of the present invention includes a valve chamber and a valve stem assembly. The valve chamber has a metering chamber, one end of which is provided with a feed port for material to enter, and the other end of the metering chamber has an opening and a mounting groove for mounting a seal. The seal is installed in the mounting groove and covers the opening. Specifically, the feed port is located at one end of the metering chamber, and the seal is located at the other end. The valve stem assembly includes a valve core, an elastic member, and a valve stem member. The valve core is elastically mounted in the metering chamber by the elastic member and can move axially within the metering chamber until it abuts the seal or blocks the feed port. When the valve core abuts the seal, the feed port is opened, allowing material to enter the metering chamber through the feed port. When the valve core moves away from the seal, one end of the valve core blocks the feed port, preventing material from entering the metering chamber. Instead, the metered amount of material in the metering chamber enters the valve core through the feed area between the seal and the valve core. Meanwhile, one end of the valve stem member passes through the seal and extends into the valve core, while the other end of the valve stem member protrudes outside the seal. The sealing member can be positioned in the mounting groove by cooperating with the mounting groove through its own structure, or the sealing member can be fixed in the mounting groove by other components to assist in positioning the valve stem member. The valve stem member is hollow and there is a feeding gap between the valve stem and the valve core for feeding. Specifically, the valve stem member is pressed, and the valve stem member pushes the valve core out of the sealing member to form a feeding area between the valve core and the sealing member for the material to enter the valve core, and one end of the valve core blocks the feed port. The material in the quantitative cavity enters the valve core through the feeding area, and then enters the valve stem member through the feeding gap and is discharged. The quantitative valve structure of the present invention is compact and reasonable, and can quantitatively measure materials through the quantitative cavity. The feeding area for feeding materials into the valve stem assembly is opened and closed by pressing the valve stem member. There will be no leakage after the material is released, and the use effect is better.

[0011] Preferably, the metering cavity is provided with a plurality of protrusions extending circumferentially near the feed port, one end of the elastic member abuts against the valve core, the other end abuts against the inner wall of the metering cavity, and the side surface of the elastic member abuts against the plurality of protrusions.

[0012] Preferably, a stopper cooperating with the elastic member is provided on the valve core, and one end of the elastic member abuts against the stopper.

[0013] Preferably, the outer wall of the valve core is provided with a plurality of convex parts, the convex parts are fitted in the quantitative cavity, and a flow area for material flow is formed between the two convex parts, and the flow area can be connected to the feed area.

[0014] Preferably, a guide portion and a sealing portion are provided at one end of the valve core. The guide portion is provided at the end of the valve core and always passes through the feed port. The outer diameter of the guide portion is smaller than the aperture of the feed port. The sealing portion is close to the guide portion, and the sealing portion has a gradual structure with a cross-sectional area gradually increasing from one end to the other end of the guide portion. The valve stem drives the sealing portion to gradually extend into the feed port until the feed port is blocked.

[0015] Preferably, the valve core is provided with an inner cavity for accommodating the valve stem member, and a plurality of mounting blocks are provided in the inner cavity so as to protrude along its circumference. The mounting blocks are provided with patterns that cooperate with the valve stem member, and one end of the valve stem member is attached to the mounting block, and the feeding gap for the material to pass through is formed between the two mounting blocks.

[0016] Preferably, a top block is provided at one end of the inner cavity, and one end of the valve stem abuts against the top block. The valve stem is pressed against the top block to move the valve core along the quantitative cavity to separate from the sealing member and block the feed port.

[0017] Preferably, the sealing member is provided with a mounting hole for the valve stem member to extend into, and the valve stem member passes through the mounting hole and is interference-fitted with the mounting hole.

[0018] To achieve the above-mentioned other object, the present invention provides an aerosol, comprising a fixed cover and a container for filling a material, and also comprising the above-mentioned metering valve structure, wherein the metering valve structure is mounted on the container via the fixed cover, and the metering valve structure and the fixed cover are sealed. The fixed cover and the container are also sealed.

[0019] After adopting the above technical solution, the aerosol of the present invention includes a container and a metering valve structure. The container is used to hold various materials, and the metering valve structure enables the materials in the container to be discharged in a metered manner. After using the metering valve structure of the present invention, the aerosol will not leak after the metered release, and the user experience is better.

[0020] Preferably, a liquid guide tube connected to the feed port is provided at one end of the valve chamber, so that the material in the container is transferred to the quantitative cavity via the liquid guide tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 1 is a structural diagram of a metered-dispensing valve provided in one embodiment of the present invention.

[0023] Figure 2 yes Figure 1 sectional view of .

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0025] Figure 4 yes Figure 2 Cross-sectional view in another state.

[0026] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0027] Figure 6 yes Figure 1 Structural breakdown diagram.

[0028] Figure 7 yes Figure 6 Structural diagram of the middle valve chamber.

[0029] Figure 8 yes Figure 6 Structural diagram of the middle valve core.

[0030] Figure 9 yes Figure 8 sectional view of .

[0031] Figure 10 yes Figure 6 Cross-sectional view of the valve stem.

[0032] Figure 11 1 is a structural diagram of an aerosol provided by one embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1000, aerosol; 100, metered-dose valve; 10, fixed cover; 11, accommodating chamber; 20, valve chamber; 201, feeding area; 21, metered-dose chamber; 22, feeding port; 23, opening; 24, mounting groove; 25, protrusion; 30, valve stem assembly; 31, valve core; 311, top block; 312, inner cavity; 313, mounting block; 3131, texture; 314, protrusion; 315, guide portion; 316, sealing portion; 317, flow interval; 318, feeding gap; 319, stopper; 32, valve stem member; 321, channel; 322, mating portion; 33, elastic member; 40, liquid introduction tube; 50, sealing member; 51, mounting hole; 200, container. DETAILED DESCRIPTION

[0035] In order to explain the technical content and structural features of the present invention in detail, the following is a further description in conjunction with the embodiments and the accompanying drawings.

[0036] See also Figures 1 to 6The present invention provides a quantitative valve structure including a valve chamber 20, a sealing member 50 and a valve stem assembly 30. The valve chamber 20 has a quantitative chamber 21, one end of which is provided with a feed port 22 for material to enter, and the other end of the quantitative chamber 21 is opened to form an opening 23. The opening 23 is provided with a mounting groove 24 for mounting the sealing member 50. The sealing member 50 is mounted in the mounting groove 24 and covers the opening 23. In some embodiments, in a specific installation, the sealing member 50 is mounted in the mounting groove 24, with one end abutting against the fixed cover 10, so as to seal between the fixed cover 10 and the valve chamber 20, and at the same time, seal between the fixed cover 10 and the valve stem 32. Of course, the sealing member 50 can also cooperate with the specific structure of the mounting groove 24 according to its own structure, so that the sealing member 50 is fixed in the mounting groove 24. The valve stem assembly 30 includes a valve core 31, an elastic member 33, and a valve stem member 32. The valve core 31 is elastically mounted within the metering chamber 21 by the elastic member 33, allowing the valve core 31 to move axially within the metering chamber 21 until it abuts the seal 50 or blocks the feed port 22. When the valve core 31 abuts the seal 50, the feed port 22 is opened and material is fed into the metering chamber 21. When the valve core 31 is separated from the seal 50 and blocks the feed port 22, an open feed area 201 is formed between the valve core 31 and the seal 50. Material in the metering chamber 21 can enter the valve core 31 through the feed area 201. The feed area 201 is arranged around the top of the valve core 31. The entire area around the top where the valve core 31 and the seal 50 cooperate is the feed area 201, making feeding faster and more uniform. On the other hand, one end of the valve stem 32 passes through the seal 50 and extends into the valve core 31. The valve stem 32 is hollow, and a feeding gap 318 is formed between the valve core 31 and the seal 50 for feeding material. Specifically, the valve stem 32 is pressed to push the valve core 31 away from the seal 50, forming a feeding area 201 between the valve core 31 and the seal 50 for material to enter the valve core 31. One end of the valve core 31 blocks the feed port 22. The material in the metering chamber 21 passes through the feeding area 201 and then through the feeding gap 318 into the valve stem 32 and is discharged through the valve stem 32. When the valve stem 32 is released, the elastic member 33 drives the valve core 31 back to abut against the seal 50, reopening the feed port 22 and allowing material to enter the metering chamber 21.

[0037] After adopting the above technical solution, the metering valve structure of the present invention includes a valve chamber 20 and a valve stem assembly 30. The valve chamber 20 has a metering chamber 21 for metering material. One end of the metering chamber 21 is provided with a feed port 22 for material to enter. The other end of the metering chamber 21 has an opening 23 and a mounting groove 24 for mounting a seal 50. The seal 50 is installed in the mounting groove 24 and covers the opening 23. In other words, the feed port 22 is located at one end of the metering chamber 21, and the seal 50 is located at the other end of the metering chamber 21. The valve stem assembly 30 includes a valve core 31, an elastic member 33, and a valve stem 32. The valve core 31 is elastically mounted within the valve chamber 20 by the elastic member 33 and can move axially within the metering chamber 21 until it abuts the seal 50 or blocks the feed port 22. When the valve core 31 abuts the seal 50, the feed port 22 is open, and material can enter the metering chamber 21 through the feed port 22. When the valve core 31 leaves the seal 50, one end of the valve core 31 blocks the feed port 22, preventing material from entering the metering chamber 21. Instead, the metered amount of material in the metering chamber 21 enters the valve core 31 through the feed area 201 between the seal 50 and the valve core 31. Meanwhile, one end of the valve stem 32 passes through the seal 50 and extends into the valve core 31, while the other end protrudes out of the seal 50. The seal 50 can be positioned within the mounting groove 24 by cooperating with the mounting groove 24 through its own structure, or the seal 50 can be secured within the mounting groove 24 via other components such as the fixing cover 10 to assist in positioning the valve stem 32. The valve stem 32 is hollow, and a feeding gap 318 is defined between the valve stem 32 and the valve core 31 for feeding material. Specifically, by pressing the valve stem 32, the valve stem 32 pushes the valve core 31 away from the seal 50, forming a feed area 201 between the valve core 31 and the seal 50 for material to enter the valve core 31. One end of the valve core 31 blocks the feed port 22. Material in the metering chamber 21 enters the valve core 31 through the feed area 201, then enters the valve stem 32 through the feed gap 318 and is discharged. The metering valve structure of the present invention is compact and reasonable, capable of metering material through the metering chamber 21. The feed area 201 for feeding material into the valve stem assembly 30 is opened and closed by pressing the valve stem 32. After the material is released, there will be no leakage, resulting in a better performance.

[0038] See also Figures 2 to 5In some optional embodiments, the metering chamber 21 is provided with a plurality of protrusions 25 protruding along the circumferential direction near the feed port 22. One end of the elastic member 33 abuts the valve core 31, and the other end abuts the inner wall of the metering chamber 21, and the side of the elastic member 33 abuts the plurality of protrusions 25. The plurality of protrusions 25 provided in the metering chamber 21 can guide and position the elastic member 33, making the overall connection structure more stable. Among them, a stopper 319 is provided on the outer wall of the valve core 31 to cooperate with the elastic member 33. The elastic member 33 is sleeved on the valve core 31, and one end of the elastic member 33 abuts on the stopper 319, and the other end abuts on the inner wall of the metering chamber 21 near the feed port 22 in the metering chamber 21. The valve stem 32 pushes the valve core 31 to squeeze the elastic member 33, so that the valve core 31 can extend into the feed port 22 and block the feed port 22. One end of the feed port 22 is connected to a liquid introduction pipe 40 for introducing the material.

[0039] See also Figure 8 In some optional embodiments, the outer wall of the valve core 31 is provided with a plurality of protrusions 314. The protrusions 314 are in contact with the metering chamber 21. A flow region 317 for material flow is formed between the two protrusions 314. The flow region 317 can be connected to the feed area 201. It can be understood that the provision of the protrusions 314 can ensure a stable fit between the valve core 31 and the metering chamber 21, while also preventing the valve core 31 from completely contacting the inner wall of the metering chamber 21 and affecting the delivery of the material. When the material is quantitatively released, the material can flow from the flow region 317 between the two protrusions 314 within the metering chamber 21 to the feed area 201, then enter the valve core 31, and then be released to the outside through the valve stem 32.

[0040] See also Figure 8 and Figure 9In some optional embodiments, a guide portion 315 and a sealing portion 316 are provided at one end of the valve core 31. The guide portion 315 is provided at the end of the valve core 31 and constantly passes through the feed port 22. The outer diameter of the guide portion 315 is smaller than the aperture of the feed port 22. The guide portion 315 does not affect the entry of the material into the metering chamber 21 in the feed port 22. The guide portion 315 is constantly placed in the feed port 22 and does not separate from the feed port 22, and can guide the sealing portion 316 to better block the feed port 22. The guide portion 315 is placed in the feed port 22, and a plurality of protrusions 25 are provided in the metering chamber 21 to position the elastic member 33, so that when the valve core 31 moves axially in the metering chamber 21, it will not deviate, thereby better blocking the feed port 22 of the metering chamber 21. When the elastic member 33 is moved and compressed, the sealing portion 316 enters the feed port 22 and gradually blocks the feed port 22, so that the material can be quantitatively released through the metering chamber 21. Specifically, the sealing portion 316 is located near the guide portion 315, and the sealing portion 316 has a gradually changing cross-sectional area from one end of the guide portion 315 to the other end. The valve stem 32 drives the sealing portion 316 to gradually extend into the feed port 22 from the small end until it blocks the feed port 22. The overall structure is rationally arranged, the material is easily loaded and unloaded, and the sealing operation of the feed port 22 of the metering chamber 21 is convenient.

[0041] See also Figures 8 to 10In some optional embodiments, the valve core 31 defines an inner cavity 312 for accommodating the valve stem 32. A plurality of mounting blocks 313 are circumferentially protruding from the inner cavity 312. The plurality of mounting blocks 313 are used to support and mount the valve stem 32. Each mounting block 313 is provided with a groove 3131 that mates with the valve stem 32. A mating portion 322 is provided on the outer side of the valve stem 32 to mate with the mounting block 313. The mating portion 322 mates with the mounting block 313, so that one end of the valve stem 32 mates with the mounting block 313, ensuring a secure overall installation. A feed gap 318 is formed between the two mounting blocks 313 for material to pass through. The material in the metering chamber 21 enters the inner cavity 312 of the valve core 31 through the flow region 317 and the feed region 201, and then enters the valve stem 32 through the feed gap 318. Specifically, a passage 321 is provided through the valve stem 32 for material flow. After entering the valve stem 32, the material is released outside the container 200 through the passage 321. As will be appreciated, the mounting block 313 protrudes from the inner cavity 312 to prevent the valve stem 32 from completely fitting within the inner cavity 312 of the valve core 31, which would otherwise affect the flow of material. Furthermore, the valve stem 32 fits snugly within the mounting block 313, making the overall structure stable and reliable. Furthermore, a top block 311 is provided at one end of the inner cavity 312. The top block 311 protrudes from the inner cavity 312 on its sides and bottom, and one end of the valve stem 32 abuts against the top block 311. When the valve stem 32 is pressed, it pushes against the top block 311, which, under the force, drives the valve core 31 along the metering chamber 21, away from the sealing member 50, and blocks the feed port 22.

[0042] See also Figures 2 to 6 In some optional embodiments, the sealing member 50 is provided with a mounting hole 51 for the valve stem 32 to extend therethrough. The valve stem 32 passes through the mounting hole 51 and forms an interference fit therewith. It will be appreciated that the sealing member 50 is fixed between the stationary cover 10 and the valve chamber 20, and the valve stem 32 passes through the sealing member 50 and engages with the valve core 31. The sealing member 50 can provide a seal between the stationary cover 10 and the valve stem 32 and can also reinforce the installation of the valve stem 32 within the valve core 31.

[0043] See also Figure 11The present invention also provides an aerosol 1000 comprising a fixed cover 10 and a container 200 for filling a material, and a metered-dose valve 100 comprising the aforementioned metered-dose valve structure. The metered-dose valve structure is mounted on the container 200 via the fixed cover 10. The metered-dose valve structure and the fixed cover 10 are sealed, and the fixed cover 10 and the container 200 are sealed. The container 200 can be filled with various suitable materials requiring metered release. The fixed cover 10 has a receiving cavity 11 for positioning and mounting a valve chamber 20, a sealing member 50, and a valve stem assembly 30. One end of the valve chamber 20 is positioned within the receiving cavity 11, and the sealing member 50 is disposed between the valve chamber 20 and the fixed cover 10. The sealing member 50 provides a seal between the fixed cover 10, the valve chamber 20, and the valve stem 32. Furthermore, a liquid inlet 40 connected to the feed port 22 is disposed at one end of the valve chamber 20. The liquid inlet 40 is used to transfer the material within the container 200 to the metered-dose cavity 21.

[0044] After adopting the above technical solution, the aerosol 1000 of the present invention includes a container 200 and a metering valve 100. The container 200 is used to hold various materials, and the metering valve 100 allows the materials in the container 200 to be discharged in a metered manner. After using the metering valve 100 of the present invention, the aerosol 1000 will not leak after the metered release, and the user experience is better.

[0045] like Figures 1 to 11As shown, the aerosol 1000 of the present invention includes a container 200 and a metered-dose valve 100. The metered-dose valve 100 includes a fixed cover 10, a valve chamber 20, and a valve stem assembly 30. The fixed cover 10 is used to position the valve chamber 20 and the valve stem assembly 30 and to install the valve chamber 20 and the valve stem assembly 30 on the container 200. The fixed cover 10 has a receiving chamber 11, within which the valve chamber 20 and the valve stem assembly 30 are installed. One end of the valve chamber 20 is positioned within the receiving chamber 11, and a sealing member 50 is provided between the valve chamber 20 and the fixed cover 10. The sealing member 50 provides a seal between the valve chamber 20 and the fixed cover 10. The sealing ring also provides a seal between the fixed cover 10 and the valve stem 32. The sealing member 50 also cooperates with the valve core 31 to open and close the flow of material from the metered-dose chamber 21 to the feed zone 201 within the valve core 31. The valve chamber 20 has a metering chamber 21 for metering material. A feed port 22 for material entry is provided at one end of the metering chamber 21, and a seal 50 is mounted at the other end of the valve chamber 20. Specifically, the feed port 22 is located at one end of the metering chamber 21, and the seal 50 is located at the other end. The valve stem assembly 30 includes a valve core 31, an elastic member 33, and a valve stem 32. The valve core 31 is elastically mounted within the metering chamber 21 via the elastic member 33 and can move axially within the metering chamber 21 until it abuts against the seal 50 or blocks the feed port 22. When the valve core 31 abuts against the seal 50, the feed port 22 is open, allowing material to enter the metering chamber 21 through the feed port 22. When the valve core 31 leaves the seal 50, one end of the valve core 31 blocks the feed port 22, preventing material from entering the metering chamber 21. Instead, the metered amount of material in the metering chamber 21 enters the valve core 31 through the feed area 201 between the seal 50 and the valve core 31. Meanwhile, one end of the valve stem 32 passes through the seal 50 and extends into the valve core 31, while the other end of the valve stem 32 is located outside the fixed cover 10. The valve stem 32 is hollow and defines a feed gap 318 between it and the valve core 31 for feeding material. Specifically, when the valve stem 32 is pressed, it pushes the valve core 31 away from the seal 50, forming a feed area 201 between the valve core 31 and the seal 50 for material to enter the valve core 31. One end of the valve core 31 blocks the feed port 22. Material in the metering chamber 21 enters the valve core 31 through the feed area 201, then enters the valve stem 32 through the feed gap 318 and is discharged. The aerosol 1000 of the present invention has a metering valve 100 with a compact and reasonable structure. It can measure the material through the metering chamber 21. The feeding area 201 is located in the container 200 and is opened and closed by pressing the valve stem 32. The operation is convenient. After the material is released, there will be no leakage outside the valve stem 32, and the use effect is better.

[0046] The above disclosure is only a preferred embodiment of the present invention and cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are within the scope of the present invention.

Claims

1. A quantitative valve structure, characterized in that: include: The valve chamber has a quantitative cavity, one end of which is provided with a feed port for material to enter, and the other end of which has an opening and a mounting groove for mounting a seal, wherein the seal is mounted in the mounting groove and covers the opening; The valve stem assembly comprises a valve core, an elastic member and a valve stem member, wherein the valve core is elastically mounted in the metering cavity by means of the elastic member so as to be able to axially move to abut against the sealing member or to block the feed port; one end of the valve stem member passes through the sealing member and extends into the valve core, and the valve stem member is hollow and has a feeding gap for feeding material between the valve stem member and the valve core; the valve stem member is pressed to push the valve core out of the sealing member, so as to form a feeding area between the valve core and the sealing member for feeding material into the valve core, the feeding area being annularly arranged at the top of the valve core, and one end of the valve core blocking the feed port; the material in the metering cavity passes through the feeding area and then through the feeding gap into the valve stem member and is discharged; The quantitative cavity is provided with a plurality of protrusions protruding along the circumferential direction near the feed port, one end of the elastic member abuts against the valve core, the other end abuts against the inner wall of the quantitative cavity, and the side surface of the elastic member abuts against the plurality of protrusions; the outer wall of the valve core is provided with a plurality of convex portions protruding, the convex portions are fitted into the quantitative cavity, and a flow interval for material flow is formed between the two convex portions, and the flow interval can be connected to the feed area; a guide portion and a sealing portion are provided at one end of the valve core, and the guide portion is provided at the end of the valve core and constantly passes through the feed port. The feed port, the outer diameter of the guide part is smaller than the aperture of the feed port; the sealing part is close to the guide part, and the sealing part has a gradual structure with a cross-sectional area gradually increasing from one end to the other end of the guide part, and the valve stem drives the sealing part to gradually extend into the feed port until the feed port is blocked; the valve core is provided with an inner cavity for accommodating the valve stem part, and a plurality of mounting blocks are provided in the inner cavity along its circumferential protrusion, one end of the valve stem part is attached to the mounting block, and the feeding gap for the material to pass through is formed between the two mounting blocks.

2. The quantitative valve structure according to claim 1, characterized in that: The valve core is provided with a stopper matched with the elastic member, and one end of the elastic member abuts against the stopper.

3. The quantitative valve structure according to claim 1, characterized in that: The mounting block is provided with lines that match the valve stem.

4. The quantitative valve structure according to claim 1, characterized in that: A top block is provided at one end of the inner cavity, and one end of the valve stem member abuts against the top block. Pressing the valve stem member pushes the top block to move the valve core along the quantitative cavity, away from the sealing member, and block the feed port.

5. The quantitative valve structure according to claim 1, characterized in that: The sealing member is provided with a mounting hole for the valve stem member to extend into, and the valve stem member passes through the mounting hole and is interference-fitted with the mounting hole.

6. An aerosol comprising a fixed cover and a container for filling a material, characterized in that: It also includes the quantitative valve structure according to any one of claims 1 to 5, wherein the quantitative valve structure is installed on the container via the fixed cover, the quantitative valve structure and the fixed cover are sealed, and the fixed cover and the container are sealed.

7. The aerosol according to claim 6, characterized in that One end of the valve chamber is provided with a liquid guide tube connected to the feed port, and the material in the container is transferred to the quantitative cavity through the liquid guide tube.

Images