Spray cover and aerosol can

Abstract

The utility model belongs to the technical field of spray covers, and mainly relates to a spray cover and an aerosol can, the spray cover comprises a pressing block movably assembled on a can body, the pressing block is provided with an insertion pipe and a nozzle which are communicated with each other, and the outer side of the insertion pipe is sleeved with a slow release assembly; the slow release assembly comprises a piston and a cavity with a sealed cavity, the piston and the cavity are connected to the outer side of the insertion pipe in a sleeving mode, and the piston is fixedly connected with the pressing block through a sleeve connected to the insertion pipe in a sleeving mode. The cavity is used for being filled with liquid with viscous resistance, the piston divides the cavity into a first cavity and a second cavity which are communicated with each other, and the pressing block is moved to drive the piston to slide in the cavity so that the liquid can flow between the first cavity and the second cavity; the insertion pipe is sleeved with a spring, and the two ends of the spring are connected with the pressing block and the cavity respectively. The reset speed of the pressing block is delayed through the synergistic effect of the viscous resistance of the slow release assembly and the elastic force of the spring, and therefore the valve rod can still be kept in the open state temporarily after pressing is stopped, and continuous release of spray is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of spray cap technology, and mainly relates to a spray cap and an aerosol can. Background Technology

[0002] Aerosol cans are now widely used in people's daily lives, such as in the fields of medicine and health, and cosmetics. Aerosol cans are usually sprayed out in a mist form by pressing the spray cap.

[0003] While common aerosol cans can stably spray mist by pressing the spray cap, continuous pressing is required to maintain spray flow. If pressing the cap stops, spraying immediately ceases, failing to meet the user's desire for continuous spraying without constant cap pressing and automatic stoppage. Utility Model Content

[0004] This invention provides a spray cap and an aerosol can to solve the problem in the prior art where the aerosol can immediately stop spraying if the spray cap is not continuously pressed.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A spray cap for mounting on the body of an aerosol can includes a pressing block movably mounted on the body of the can. The pressing block has an interconnected tube and a nozzle. The tube is used to connect to a valve stem on the body of the can. A slow-release component for slow release of the pressing block is sleeved on the outside of the tube.

[0007] The sustained-release assembly includes a piston and a cavity with a sealed cavity, wherein the piston and the cavity are sleeved on the outside of the cannula, the cavity is used to fix it to the cannula, the piston slides along the axial direction of the cannula in the cavity, and the piston is fixedly connected to the pressing block through a sleeve sleeved on the cannula.

[0008] The cavity is filled with a liquid with viscous resistance. The piston divides the cavity into a first cavity and a second cavity that are interconnected. Moving the pressing block drives the piston to slide within the cavity so that the liquid flows between the first cavity and the second cavity.

[0009] A spring is fitted to the outside of the cannula, with the two ends of the spring connected to the pressing block and the cavity, respectively.

[0010] It has the following beneficial effects: by utilizing the synergistic effect of the viscous resistance of the slow-release component and the spring force, the reset speed of the pressing block is slowed down, so that the valve stem can remain open for a short time after the pressing stops, thus achieving continuous spray release.

[0011] Furthermore, the slow-release assembly includes a cover fixed to the pressing block, the cover being sleeved on the cannula and the cavity, a receiving cavity being provided between the cover and the cavity, a spring being located in the receiving cavity, and the sleeve being fixed to the cover.

[0012] It has the following beneficial effects: the spring is placed in the receiving cavity between the cover and the cavity, and the two ends are connected to the cover (pressing block side) and the cavity respectively, forming an independent spring working space. The receiving cavity provides axial constraint for the spring, preventing the spring from radially offset or bending during compression / extension, ensuring that the elastic force is stably transmitted along the insertion tube axis, and the assembly accuracy of the cover and the cavity can accurately control the initial compression of the spring.

[0013] Furthermore, the sustained-release assembly includes a liner sleeved on the outside of the cannula, a cover, a sleeve, and a piston all sleeved on the outside of the liner, a cavity fixed on the outside of the liner, and the cavity being sleeved on the cannula through the liner.

[0014] It offers the following advantages: the cover, cavity, liner, piston, sleeve, and spring can be pre-assembled into a complete slow-release component, which is then assembled with the pressing block and insertion tube. This simplifies production line processes and reduces errors from individual component installations. It also facilitates later maintenance or replacement; when the slow-release function fails, the entire slow-release component can be directly replaced without disassembling the complex internal structure.

[0015] Furthermore, a partition is fitted onto the liner inside the cavity. The partition is located below the piston, and the partition forms a sealed gas chamber inside the cavity. The gas chamber is used to fill the gas chamber. The gas and liquid are separated by the partition. When the piston moves in the liquid, it drives the partition to move, thereby changing the size of the gas chamber.

[0016] It has the following beneficial effects: the gas filling the gas chamber is compressible. When the pressing block is pressed down, the piston pushes the partition to move downward, the volume of the gas chamber decreases, and the gas is compressed and stores elastic potential energy. When the pressing block is released, the compressed gas expands and pushes the partition to move upward, which drives the piston and pressing block to slowly return to their original positions.

[0017] Furthermore, the gas is nitrogen.

[0018] Furthermore, the spray cap also includes a cover body with a pressing groove, a pressing block assembled in the pressing groove and connected to the valve stem, and a spray nozzle on the cover body with the nozzle facing the spray nozzle.

[0019] It has the following beneficial effects: the pressing block is assembled in the pressing groove of the cover, and the groove wall limits the pressing block.

[0020] Furthermore, the liquid is mineral oil or silicone oil.

[0021] An aerosol can includes a can body and a spray cap, wherein a valve stem is movably mounted on the can body and the spray cap is disposed on the valve stem.

[0022] It has the following beneficial effects: by utilizing the synergistic effect of the viscous resistance of the slow-release component and the spring force, the reset speed of the pressing block is slowed down, so that the valve stem can remain open for a short time after the pressing stops, thus achieving continuous spray release. Attached Figure Description

[0023] Figure 1 This is a first-view structural diagram of the spray cap;

[0024] Figure 2 This is a structural schematic diagram of the spray cap from a second perspective;

[0025] Figure 3 A first-view structural diagram of the combination of the press block and the slow-release component;

[0026] Figure 4 A schematic diagram of the structure from a second perspective showing the interaction between the press block and the slow-release component;

[0027] Figure 5 A cross-sectional view of the press block and the slow-release component in action;

[0028] Figure 6 This is a schematic diagram of the pressing block.

[0029] Figure 7 This is a schematic diagram of the piston structure.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Cover; 2. Pressing block; 3. Nozzle; 4. Pressing groove; 5. Nozzle; 6. Slow-release assembly; 7. Insert; 8. Cavity; 9. Cover; 10. Liner; 11. Piston; 12. Sleeve; 13. First cavity; 14. Second cavity; 15. Spring; 16. Receiving cavity; 17. Partition; 18. Gas cavity; 19. Through hole. Detailed Implementation

[0032] like Figure 1 , Figure 2 As shown, a spray cap is used to assemble onto the body of an aerosol can. In this embodiment, the spray cap includes a cap body and a pressing block movably assembled onto the can body. The pressing block has an interconnected tube and a nozzle. The tube is used to connect to a valve stem on the can body, and a slow-release component for slowly releasing the pressing block is sleeved on the outside of the tube. The cap body has a pressing groove, the pressing block is assembled into the pressing groove and connected to the valve stem of the can body, and the cap body has a spray nozzle, with the nozzle facing the spray nozzle.

[0033] The pressing block is assembled within the pressing groove of the cover, with the groove wall providing a limiting effect. Radial limiting prevents the pressing block from wobbling in the horizontal direction (perpendicular to the insertion tube axis), avoiding uneven force on the valve stem, wear of the sealing ring, or air leakage due to pressing misalignment. Axial guiding: The inner wall of the pressing groove forms a sliding fit with the outer surface of the pressing block (e.g., rectangular groove and rectangular block, cylindrical groove and cylindrical surface), ensuring the pressing block moves vertically along the insertion tube axis and improving the linearity of the pressing feel.

[0034] In this embodiment, as Figures 3-7 As shown, the slow-release assembly includes a piston and a cavity with a sealed air cavity. The piston and cavity are fitted onto the outside of the cannula. The cavity is used to fix the piston to the canister. The piston slides along the axial direction of the cannula within the cavity. The piston is fixedly connected to a pressing block via a sleeve fitted onto the cannula. The cavity is filled with a liquid with viscous resistance. The piston divides the cavity into a first chamber and a second chamber. The piston has a through hole connecting the first chamber and the second chamber. Moving the pressing block drives the piston to slide within the cavity, allowing the liquid to flow between the first and second chambers through the through hole. A spring is fitted onto the outside of the cannula, with its two ends connected to the pressing block and the cavity, respectively.

[0035] This embodiment utilizes the synergistic effect of the viscous resistance of the slow-release component and the spring force to slow down the reset speed of the pressing block, thereby maintaining the valve stem open briefly after the pressing stops, achieving continuous spray release.

[0036] The spring on the outside of the cannula is connected to the pressing block and the cavity at its two ends. When the pressing block is pressed, the spring is compressed and stores elastic potential energy; when the pressing is stopped, the spring releases the potential energy and pushes the pressing block to move in the reset direction (i.e., away from the cannula).

[0037] The spring provides a continuous reset driving force, allowing the pressing block to maintain a certain tendency to move even when no external force is applied, thus preventing it from stopping immediately when the external force disappears.

[0038] The cavity is filled with a viscous liquid, and the piston divides the cavity into a first chamber and a second chamber, with a through-hole connecting the two chambers. When the pressing block moves, the piston slides within the cavity, and the liquid must flow between the two chambers through the through-hole. The viscous resistance significantly slows down the piston's sliding speed. The flow resistance of the viscous liquid creates a "damping effect," prolonging the piston's (and pressing block's) reset process rather than completing it instantaneously. The piston is fixedly connected to the pressing block via a sleeve, ensuring that the movement of the pressing block is directly transmitted to the piston, and the two move synchronously, avoiding transmission lag.

[0039] The pressing block moves downward, compressing the spring. The piston slides towards the bottom of the chamber, and the liquid in the first chamber flows into the second chamber through the through hole. The viscous resistance slows down the pressing speed of the pressing block (but at this time, the external force dominates the pressing process, and the effect is not significant). The tube connects with the valve stem, and the aerosol can sprays normally.

[0040] When the external force disappears, the spring begins to release its elastic potential energy, pushing the pressing block upwards to reset (away from the tank). The piston moves upwards synchronously with the pressing block. The liquid in the second chamber needs to flow back to the first chamber through the through hole, but the viscous resistance causes the liquid to flow slowly, creating reverse damping.

[0041] The spring's restoring force needs to overcome viscous resistance to drive the liquid flow, thus significantly delaying the restoring speed of the pressing block (rather than instantaneously rebounding), extending the time that the insertion tube and valve stem remain connected.

[0042] During the slow reset of the pressing block, the valve stem is not completely closed, and the pressure inside the aerosol can still push the contents out through the tube and nozzle until the pressing block is completely reset (the spring returns to its original length and the piston reaches its initial position).

[0043] Traditional spray caps rely on external force to maintain the position of the press block. Once the external force is removed, the spring immediately resets, the valve stem closes, and the spray stops. However, this embodiment transforms "instantaneous reset" into "slow reset" through the dynamic balance of viscous damping and spring force, thereby achieving brief spray continuity when there is no continuous pressing and avoiding liquid interruption. Furthermore, the spray process is gentler and more uniform, reducing the droplet splashing or atomization discontinuity problems caused by traditional abrupt stops.

[0044] As can be seen from the above, the spray cap can achieve delayed stopping of spraying through physical structure without relying on continuous external force, thereby improving the user experience and functional adaptability.

[0045] In this embodiment, the liquid is mineral oil or silicone oil.

[0046] like Figure 5 As shown, the slow-release assembly includes a cover fixed to the pressing block, the cover being sleeved on the cannula and the cavity, a receiving cavity being provided between the cover and the cavity, a spring being located in the receiving cavity, and the sleeve being fixed to the cover.

[0047] In this embodiment, the cover further improves the performance stability, service life, and user experience of the spray cap.

[0048] The cover is fixed to the pressing block and rigidly connected to the piston through a sleeve (the sleeve is also fixed to the cover), forming a direct transmission chain of "pressing block → cover → sleeve → piston", ensuring that the displacement of the pressing block is synchronously transmitted to the piston, and improving the response accuracy of the damping effect.

[0049] The spring is placed in the receiving cavity between the cover and the cavity, with its two ends connected to the cover (pressing block side) and the cavity respectively, forming an independent spring working space. The receiving cavity provides axial constraint for the spring, preventing radial displacement or lateral bending of the spring during compression / extension, ensuring stable transmission of spring force along the insertion tube axis, and the assembly accuracy of the cover and cavity can precisely control the initial compression of the spring.

[0050] The cover fits over the outside of the cannula and cavity, forming a relatively sliding sealing structure (such as with a sealing ring) to enclose the core components of the slow-release assembly (piston, liquid, spring) inside. This prevents dust, liquid, or foreign matter from entering the receiving cavity and empty cavity, preventing piston jamming or deterioration of viscous liquid, and extending the assembly's service life. Simultaneously, the cover assists in sealing the cavity, reducing the risk of viscous liquid leakage from the interface between the press block and the cavity, ensuring the stability of the damping effect.

[0051] The cover, acting as an external support structure, encloses the connection between the cannula and the cavity, providing physical protection for internal precision components (such as valve stems and springs). It prevents loosening of the cannula-cavity interface caused by frequent movement of the pressing block, reducing the risk of structural damage from external impacts or compression. It also distributes localized stress during pressing, preventing the pressing block from breaking or deforming due to prolonged stress (especially at the connection point between the cannula and the pressing block).

[0052] In this embodiment, the cover, as an independent component, can be pre-integrated and assembled with the cavity, piston, sleeve, and spring to form a complete slow-release assembly, which is then assembled with the pressing block and insertion tube as a whole. This simplifies the production line process and reduces errors from individual component installation. It also facilitates later maintenance or replacement; when the slow-release function fails, the entire slow-release assembly can be directly replaced instead of disassembling the complex internal structure.

[0053] In this embodiment, the piston and the sleeve are integrally formed.

[0054] In this embodiment, the sustained-release assembly includes a liner sleeved on the outside of the cannula, a cover, a sleeve, and a piston all sleeved on the outside of the liner, a cavity fixed on the outside of the liner, and the cavity sleeved on the cannula through the liner.

[0055] The liner is fitted onto the outside of the insertion tube, acting as an "intermediate support layer." It transfers the mechanical load of components such as the piston and cavity to the insertion tube, preventing the insertion tube from directly bearing radial pressure or torque. This prevents the insertion tube from deforming or breaking due to prolonged pressure, improving structural durability. Simultaneously, it disperses the frictional force on the insertion tube during piston sliding, reducing wear on the insertion tube surface and ensuring reliable sealing between the valve stem and the insertion tube (preventing air leakage due to insertion tube deformation).

[0056] The piston is fitted onto the outside of the liner, whose outer surface can be precision-machined (e.g., ground, plated) to provide a smooth, coaxial sliding track for the piston. Compared to sliding directly on the insert surface, the liner makes it easier to control tolerances (e.g., cylindricity, surface roughness), ensuring the straightness of the piston's axial movement and avoiding damping instability caused by defects on the insert surface (e.g., injection molding marks). Furthermore, guide grooves can be cut into the liner or ball bearings can be installed to further reduce the frictional resistance of the piston's movement, resulting in a smoother pressing feel.

[0057] In this embodiment, the liner can serve as a sealing carrier, with multiple sealing ring mounting grooves (such as O-rings and lip seals) on its surface, used for static sealing between the cavity and the liner (to prevent viscous liquid from leaking from the bottom of the cavity), and dynamic sealing between the piston and the liner (to control the liquid to flow only through the through hole on the piston).

[0058] At the same time, materials can be selected according to different sealing requirements. For example, oil-resistant plastics (such as POM) can be used for the liner, and fluororubber can be used for the sealing ring to improve the resistance to liquid corrosion.

[0059] The cannula uses chemically resistant PP material, the liner uses high-strength PA66 and glass fiber, and the cavity uses low-cost ABS. Furthermore, the liner surface is electroplated with a metal layer to improve wear resistance (e.g., in scenarios with frequent piston sliding). This optimizes the cost structure, using high-performance materials for critical load-bearing components (liners) and ordinary materials for non-critical components (such as the housing).

[0060] In this embodiment, a partition is fitted onto the liner inside the cavity. The partition is located below the piston. The partition forms a sealed gas chamber inside the cavity, which is used to fill the gas chamber. The gas and liquid are separated by the partition. When the piston moves in the liquid, it drives the partition to move, thereby changing the size of the gas chamber.

[0061] In this embodiment, the baffle and gas chamber structure further optimize the slow-release performance of the spray cap through gas-liquid coupling and elastic energy storage mechanism, solving the problems of single response and lack of active reset driving force in traditional pure liquid damping systems.

[0062] The gas filling the gas chamber (such as air or nitrogen) is compressible. When the pressing block is pressed down, the piston pushes the partition to move downward, the volume of the gas chamber decreases, and the gas is compressed and stores elastic potential energy. When the pressing block is released, the compressed gas expands and pushes the partition to move upward, causing the piston and pressing block to slowly return to their original positions.

[0063] In this embodiment, after the pressing stops, the potential energy of the gas expansion is converted into the axial driving force of the piston, preventing the pressing block from immediately rebounding. Instead, it maintains a slow reset for a certain period of time, thereby prolonging the open state of the aerosol can valve and achieving "delayed spraying under non-continuous pressing". At the same time, if the original spring is not elastic enough or degrades after long-term use, the gas chamber can serve as an auxiliary reset power source to ensure the stability of the slow-release function.

[0064] During the pressing phase: the piston moves downward, and the liquid flows from the first chamber to the second chamber through the through hole, generating viscous resistance and providing damping for the pressing feel; at the same time, the gas chamber is compressed, the gas pressure increases, forming additional "gas pressure damping", and the combination of the two makes the pressing process smoother.

[0065] Reset phase: Gas expansion drives the piston to move upward, and the liquid flows in the opposite direction through the through hole to generate viscous resistance. At the same time, the gas pressure gradually decreases, forming a synergistic effect of "gas pressure thrust + liquid damping", which makes the reset speed uniform and controllable.

[0066] In this embodiment, when the pressing block is subjected to a sudden external force impact, the gas chamber first absorbs the impact energy through compression to prevent the piston from hitting the bottom instantly, which could lead to liquid splashing or structural damage.

[0067] The working process of this utility model is as follows:

[0068] During the pressing phase: the piston moves downward, and the liquid flows from the first chamber to the second chamber through the through hole, generating viscous resistance and providing damping for the pressing feel; at the same time, the gas chamber is compressed, the gas pressure increases, forming additional "gas pressure damping", and the combination of the two makes the pressing process smoother.

[0069] Reset phase: Gas expansion drives the piston to move upward, and the liquid flows in the opposite direction through the through hole to generate viscous resistance. At the same time, the gas pressure gradually decreases, forming a synergistic effect of "gas pressure thrust + liquid damping", which makes the reset speed uniform and controllable.

[0070] An aerosol can includes a can body and a spray cap. A valve stem is movably mounted on the can body, and the spray cap is disposed on the valve stem. By pressing the valve stem with a pressing block, the substance inside the can can be sprayed out sequentially through an insert and a nozzle.

Claims

1. A spray cap for mounting on the body of an aerosol can, characterized in that, Includes a pressing block that is movably mounted on the tank body, the pressing block having an interconnected tube and nozzle, the tube being used to connect to a valve stem on the tank body, and a slow-release component for the slow release of the pressing block being sleeved on the outside of the tube; The sustained-release assembly includes a piston and a cavity with a sealed cavity, wherein the piston and the cavity are sleeved on the outside of the cannula, the cavity is used to fix it to the cannula, the piston slides along the axial direction of the cannula in the cavity, and the piston is fixedly connected to the pressing block through a sleeve sleeved on the cannula. The cavity is filled with a liquid with viscous resistance. The piston divides the cavity into a first cavity and a second cavity that are interconnected. Moving the pressing block drives the piston to slide within the cavity so that the liquid flows between the first cavity and the second cavity. A spring is fitted to the outside of the cannula, with the two ends of the spring connected to the pressing block and the cavity, respectively.

2. The spray cap according to claim 1, characterized in that, The slow-release assembly includes a cover fixed to the pressing block, the cover being sleeved on the cannula and the cavity, a receiving cavity being provided between the cover and the cavity, a spring being located in the receiving cavity, and the sleeve being fixed to the cover.

3. The spray cap according to claim 2, characterized in that, The sustained-release assembly includes a liner sleeved on the outside of the cannula, a cover, a sleeve, and a piston all sleeved on the outside of the liner, and a cavity fixed on the outside of the liner, which is connected to the cannula through the liner.

4. The spray cap according to claim 3, characterized in that, A partition is fitted onto the liner inside the cavity. The partition is located below the piston. The partition forms a sealed gas chamber inside the cavity, which is used to fill the gas chamber. The gas and liquid are separated by the partition. When the piston moves in the liquid, it drives the partition to move, thereby changing the size of the gas chamber.

5. The spray cap according to claim 4, characterized in that, The gas is nitrogen.

6. The spray cap according to any one of claims 1-5, characterized in that, The spray cap also includes a cover body with a pressing groove, a pressing block assembled in the pressing groove and connected to the valve stem, and a spray nozzle on the cover body with the nozzle facing the spray nozzle.

7. The spray cap according to any one of claims 1-5, characterized in that, The liquid is mineral oil or silicone oil.

8. An aerosol can, characterized in that, It includes a tank and a spray cap as described in any one of claims 1-7, wherein a valve stem is movably mounted on the tank and the spray cap is arranged on the valve stem.

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