Small plastic aerosol pressure container with high sealing performance

Abstract

The utility model discloses a small plastic aerosol pressure container with high sealing performance, which relates to the technical field of pressure containers, and comprises a bottle body with external threads, a bottle cap component in threaded connection and a three-stage sealing system, the threads are meshed to form first-stage sealing, and an elastic sealing ring at the bottom end of the bottle cap component and the end face of a bottle opening form second-stage end face sealing. And the O-shaped sealing ring in the through hole of the valve rod realizes three-stage radial sealing. The valve mechanism adopts the design that a polyformaldehyde valve rod is linked with a reset spring, and the stroke of the valve rod is controlled through a guide limiting ring and a buffer gasket. A positioning boss on the inner side of the bottle cap assembly is in clearance fit with a bottle body H8 / f7 to ensure the coaxiality. Through multi-stage sealing cooperation, structural mechanics optimization and material-process matching, the problems that a traditional container is poor in sealing performance and prone to deformation are solved, the cost is reduced through the full-plasticization design, and the container is environmentally friendly, recoverable and suitable for safe storage and accurate release of high-pressure aerosol in the fields of medical treatment, fire fighting and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to conveying device technical field more specifically relates to a kind of high sealing aerosol plastic small pressure vessel. BACKGROUND

[0002] As a kind of pressure packaging form widely used in daily chemical, medicine, industry and other fields, the sealing performance of aerosol container is directly related to the storage safety and use efficiency of content. Traditional aerosol container is mostly made of metal material (such as aluminum can) to ensure structural strength and air tightness, however, metal container has problems such as heavy weight, high manufacturing cost and complex recycling process. With the development of material technology, lightweight and corrosion-resistant plastic materials have gradually attracted attention, but plastic container is prone to deformation during long-term pressure and repeated use, which leads to sealing structure failure, becoming the key bottleneck restricting its application.

[0003] Existing plastic aerosol container generally adopts single or double sealing design, for example, axial sealing relying on thread engagement or end face sealing combined with gasket. However, such structure is prone to micro-leakage due to material creep or enlarged fitting gap under conditions such as temperature fluctuation, internal pressure change or mechanical vibration. Especially in frequent opening and closing use scenarios, the sealing surface of bottle cap and bottle body joint is prone to lose compression force due to stress relaxation, causing slow leakage of medium. In addition, valve mechanism as the core component to control the release of content, the reliability of valve rod dynamic sealing faces severe challenges: traditional O-ring is prone to wear during valve rod reciprocating motion, and lacks effective guiding and buffering mechanism, leading to uneven wear of sealing interface and accelerating sealing failure. SUMMARY

[0004] The utility model aims at: in order to solve the above technical problem, the utility model provides a kind of high sealing aerosol plastic small pressure vessel.

[0005] The utility model discloses a technical scheme as follows: A kind of high sealing aerosol plastic small pressure vessel, comprising: bottle body, its top is equipped with outer thread part and annular sealing end face;Threaded bottle cap assembly, containing with the inner thread part of outer thread part cooperation, top is equipped with valve stem through-hole;Three-stage sealing system, comprising: the first grade thread seal formed by the meshing of outer thread part and inner thread part;Annular sealing groove and elastic sealing ring located at the bottom end of bottle cap assembly, the elastic sealing ring and bottle body annular sealing end face pressure joint form second grade end face seal;Annular groove and O type sealing ring in the inner wall of valve stem through-hole, the O type sealing ring and the valve stem of penetration form third grade radial seal;Valve mechanism, containing: axially movable valve stem, its lower part extends to bottle body interior and is sleeved with reset spring;Guiding limit ring is arranged on the upper part of valve stem, and the guiding limit ring is equipped with buffer gasket between bottle cap assembly top inner surface;The inside of bottle cap assembly is equipped with positioning boss, and the outer diameter thereof is gap fit with the inner diameter of bottle body top end, and bottom end face bears the elastic sealing ring.

[0006] Three-stage sealing system forms multiple protection through thread meshing, elastic sealing ring pressure joint and O ring radial seal, significantly improves the sealing reliability of container under pressure change. The gap fit design between positioning boss and bottle body realizes accurate alignment, and cooperates with elastic sealing ring to form stable sealing interface. Buffer gasket and guiding limit ring combination effectively absorb valve stem movement impact, prolong the service life of valve.

[0007] Preferably, the bottom of the bottle body is provided with radially uniformly distributed inwardly recessed support ribs.

[0008] Preferably, the outside wall of the bottle cap assembly is provided with diamond grid anti-skid knurling.

[0009] Preferably, the valve mechanism further comprises a liquid inlet pipe connected to the lower end of the valve stem, and one end of the reset spring abuts against the lower end flange of the valve stem, and the other end is sleeved on the enlarged diameter portion of the liquid inlet pipe.

[0010] Preferably, the valve stem is integrally injection molded with polyoxymethylene copolymer, comprising a hollow tube body and a reinforcing ring structure arranged coaxially, and the inner diameter of the hollow tube body forms a transition fit with the outer diameter of the liquid inlet pipe.

[0011] Preferably, the root of the support rib is provided with a circular arc transition structure, and the width of the support rib tapers from the root to the end.

[0012] Preferably, the gap fit tolerance between the positioning boss and the inner wall of the bottle body is H8 / f7, the bottom end face of the positioning boss is provided with a trapezoidal cross-section groove for accommodating the elastic sealing ring, and the groove depth is 2 / 3 of the diameter of the elastic sealing ring.

[0013] As described above, due to the adoption of the above technical scheme, the utility model has the beneficial effects that:

[0014] The utility model discloses on the sealing performance, three -level sealing system adopts thread engagement, and the elastic sealing ring pressure bonding and O ring radial seal cooperative protection form the redundant sealing barrier, cooperate trapezoidal section groove and precision tolerance design, and the accurate control sealing ring compression amount, ensure that the sealing interface even stress, the sealing reliability of container under complex working condition is improved significantly, prolongs the service life of sealing element.

[0015] The radial recess support rib constitutes a bionic dome structure, effectively disperses internal pressure stress, enhances the compression resistance while realizing lightweight; the detail optimization of the support rib is combined with injection molding process improvement, eliminates stress concentration and improves the fatigue resistance of the container.

[0016] The valve mechanism is coaxially sleeved with the enlarged diameter part through a return spring, reduces the opening and closing resistance, improves the response speed; the polyformal integrated valve rod cooperates with a buffer gasket, reduces the dynamic sealing wear, and greatly prolongs the service life of the valve.

[0017] On the man-machine engineering and process realization, the diamond grid anti-skid knurl design improves the holding torque transmission efficiency, and hides the scratches at the same time; the gap cooperation between the positioning boss and the bottle body considers the assembly accuracy and thermal expansion compensation, reduces the mold processing difficulty, and improves the production qualification rate.

[0018] On the cost and environmental protection level, the full plastic design replaces the metal tank, significantly reduces the material cost, and the transparent design facilitates the observation of the contents; the structure optimization reduces the amount of plastic, cooperates with the recyclable material, meets the environmental protection requirements, and realizes the low carbonization. The utility model realizes breakthroughs in sealing, structural strength, service life and the like, and is suitable for high-pressure aerosol application scenarios in many fields. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be explained through examples and with reference to the drawings, wherein:

[0020] Figure 1 is the structure schematic diagram of the utility model;

[0021] Figure 2 is the three-dimensional view of the bottle body of the utility model;

[0022] Figure 3 is another perspective three-dimensional view of the bottle body of the utility model;

[0023] Figure 4 is the sectional structure schematic diagram of the bottle cap assembly of the utility model;

[0024] Figure 5 is the local overhead structure schematic diagram of the valve rod of the utility model;

[0025] Marked in the figure: 1-bottle body, 2-bottle cap assembly, 3-valve mechanism, 11-outer threaded part, 12-ring seal end face, 13-supporting rib, 21-inner threaded part, 22-positioning boss, 23-ring seal groove, 24-elastic seal ring, 25-ring groove, 26-O-shaped seal ring, 31-liquid inlet pipeline, 32-reset spring, 33-valve rod, 331-strengthening ring structure, 332-hollow pipe body, 34-guiding limiting ring. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] In an embodiment of the present application, as Figures 1-5As shown, the embodiment provides a high sealing aerosol plastic small pressure container, comprising: a bottle body 1, provided with an outer threaded part 11 and an annular sealing end face 12 at the top; a threaded bottle cap assembly 2, comprising an inner threaded part 21 matched with the outer threaded part 11, and a valve rod 33 through hole opened at the top; a three-stage sealing system, comprising: a first-stage threaded sealing formed by the engagement of the outer threaded part 11 and the inner threaded part 21; an annular sealing groove 23 and an elastic sealing ring 24 located at the bottom end of the bottle cap assembly, the elastic sealing ring 24 being pressed to form a second-stage end face sealing with the annular sealing end face 12 of the bottle body 1; an annular groove 25 and an O-shaped sealing ring provided on the inner wall of the valve rod 33 through hole, the O-shaped sealing ring forming a third-stage radial sealing with the valve rod 33 penetrating through; a valve mechanism 3, comprising: an axially movable valve rod 33, the lower part of which extends into the inside of the bottle body 1 and is sleeved with a reset spring 32; a guide limiting ring 34 provided on the upper part of the valve rod 33, the guide limiting ring 34 being provided with a buffer gasket between the inner surface of the top of the bottle cap assembly; the inner side of the bottle cap assembly 2 is provided with a positioning boss 22, the outer diameter of which is matched with the gap between the inner diameter of the top end of the bottle body 1, and the bottom end face bears the elastic sealing ring 24. The three-stage sealing system forms multiple protections through threaded engagement, pressing of the elastic sealing ring 24 and radial sealing of the O-shaped ring, and significantly improves the sealing reliability of the container under pressure change. The gap matching design between the positioning boss 22 and the bottle body 1 realizes accurate positioning, and cooperates with the elastic sealing ring 24 to form a stable sealing interface. The combination of the buffer gasket and the guide limiting ring 34 effectively absorbs the movement impact of the valve rod 33, prolongs the service life of the valve.

[0029] In another embodiment of the utility model, the bottom of bottle body 1 is provided with radially uniformly distributed inwardly recessed support ribs 13. The radially support ribs 13 form a dome structure to enhance the effect and improve the resistance to internal pressure of the bottle bottom; the uniformly distributed recessed ribs optimize the material distribution while ensuring the strength, thereby reducing the overall weight; the bottom support structure can effectively resist the creep deformation caused by the pressure of the content.

[0030] In another embodiment of the utility model, the outer side wall of bottle cap assembly 2 is provided with diamond grid anti-skid knurls. The diamond grid knurls are designed through multi-directional anti-skid lines to enhance the friction force under different holding angles; the surface texture depth and density are optimized to realize the balance between anti-skid and cleaning convenience; the knurl structure can hide the surface scratches generated during use, thereby maintaining the integrity of the appearance.

[0031] In another embodiment of the utility model, the valve mechanism 3 further comprises a liquid inlet pipeline 31 connected with the lower end of valve rod 33, and the reset spring 32 is abutted against the lower end flange of valve rod 33 at one end and is sleeved with the enlarged diameter part of liquid inlet pipeline 31 at the other end. The sleeving design of reset spring 32 and the enlarged diameter part ensures the coaxiality of spring movement and avoids eccentric wear; the split abutment structure facilitates assembly and debugging, thereby reducing the manufacturing tolerance requirement; the clear force transmission path improves the response sensitivity of the valve and ensures rapid sealing.

[0032] In another embodiment of the utility model, the valve stem 33 adopts polyformal copolymer integrated injection molding, contains hollow pipe body 332 and reinforcing ring structure 331 who sets up coaxially, the hollow pipe body 332 inner diameter and the outer diameter of liquid inlet pipeline 31 form transition fit.Polyformal material (POM) is selected with the low friction coefficient characteristics of chemical resistance and low friction coefficient characteristics;Integrated injection molding eliminates assembly error, guarantees the dimensional stability of valve stem 33;The combination design of hollow pipe body 332 and reinforcing ring realizes the best balance of lightweight and rigidity.

[0033] In another embodiment of the utility model, the root of the support rib 13 is provided with a circular arc transition structure, and the width of the support rib 13 tapers from the root to the end. The root circular arc transition effectively disperses stress concentration and improves fatigue resistance; the tapered design conforms to the principle of equal strength, optimizing material utilization efficiency; the special rib structure enhances the melt flowability during injection molding, reducing molding defects.

[0034] In another embodiment of the utility model, the gap fit tolerance between the positioning boss 22 and the inner wall of the bottle body 1 is H8 / f7, and the bottom end face is provided with a trapezoidal cross-section groove accommodating the elastic sealing ring 24, and the groove depth is 2 / 3 of the diameter of the sealing ring. H8 / f7 tolerance fit ensures positioning accuracy while reserving thermal expansion and contraction compensation space; the trapezoidal cross-section groove enhances the reliability of the sealing ring fixation through wedge effect; the 2 / 3 groove depth design realizes precise control of the effective compression amount of the sealing ring, balancing the sealing force and wear.

[0035] The working principle of the utility model is:

[0036] 1. Working process of three-stage sealing system

[0037] First-stage thread sealing: the inner thread of the bottle cap assembly 2 is precisely engaged with the outer thread of the bottle body 1, forming a spiral sealing channel. The thread angle design generates axial pre-tightening force when tightening, forming preliminary mechanical sealing.

[0038] Second-stage end face sealing: when the bottle cap assembly 2 is pressed down, the elastic sealing ring 24 (such as a silicone ring) in the sealing groove is axially compressed to produce radial expansion, forming face contact static sealing with the annular sealing end face 12 of the bottle mouth, compensating for the thread fit gap.

[0039] Third-stage radial sealing: when the valve stem 33 moves, the O-ring deforms radially in the annular groove 25, forming dynamic sealing with the surface of the valve stem 33, preventing medium from leaking along the axial direction of the valve stem 33.

[0040] 2. Action principle of valve mechanism 3

[0041] Normal sealing: The return spring 32 pushes the valve stem 33 upward, and the guide limit ring 34 and the buffer gasket together limit the stroke of the valve stem 33. At this time, the three-stage sealing system is in a pressure-sealed state.

[0042] In the injection state: When the valve stem 33 is pressed down, the guide limit ring 34 compresses the buffer gasket, and the valve stem 33 drives the lower liquid inlet pipe 31 to move down and open the injection channel. At the same time, the O-ring maintains radial sliding seal.

[0043] Pressure balancing: After the valve stem 33 is released, the return spring 32 pushes the valve stem 33 to reset, and the pressure inside the bottle is quickly balanced through the inlet pipe 31. The buffer pad absorbs the reset impact energy.

[0044] 3. Structural coordination mechanism

[0045] Positioning boss 22: It fits with the inner wall of the bottle mouth H8 / f7 with a clearance to ensure that the bottle cap assembly 2 and the bottle body 1 are positioned coaxially, so that the elastic sealing ring 24 is evenly compressed and avoids sealing failure caused by uneven load.

[0046] Support rib 13 system: Radial recessed ribs form a spatial truss structure, which evenly transmits the internal compressive stress to the bottle wall. The stress gradient distribution is achieved through the tapering design to prevent local stress concentration.

[0047] Anti-slip knurling: The diamond-shaped grid generates multi-directional friction components, forming a torque transmission interface when the bottle cap assembly 2 is rotated. At the same time, the recessed areas of the grid store an air layer to enhance grip friction.

[0048] 4. Material and molding synergy

[0049] Polyoxymethylene valve stem 33: The self-lubricating properties of POM material reduce the coefficient of friction with the O-ring. The hollow tube body 332 design reduces inertial mass, and the reinforced ring structure 331 ensures bending stiffness under pressure.

[0050] Injection molding process control: The 13 support ribs have rounded transitions at the base to guide the flow of the melt, and the tapered cross-section design achieves uniform cooling, reduces internal stress during molding, and ensures dimensional stability.

[0051] When the container is subjected to vibration or temperature changes: the difference in thermal expansion is automatically compensated by the gap fit of the positioning boss 22 to avoid deformation of the sealing surface; the elastic sealing ring 24 adaptively adjusts the compression amount under axial pressure fluctuations; the support rib 13 system absorbs the energy of pressure fluctuations through elastic deformation; the valve stem 33 mechanism maintains a stable stroke under the action of the buffer pad to prevent accidental triggering.

[0052] This utility model achieves high sealing reliability throughout the entire process from static storage to dynamic use through a triple guarantee mechanism of mechanical seal, elastomer compensation, and structural reinforcement, making it particularly suitable for portable pressure vessel applications that require frequent opening and closing.

Claims

1. A high-seal aerosol plastic mini pressure container, characterized by, The utility model relates to a three-level sealing system bottle cap assembly and valve mechanism, and belongs to the technical field of packaging. The utility model discloses a three-level sealing system bottle cap assembly and valve mechanism, which comprises a bottle body (1) provided with an outer threaded part (11) and an annular sealing end face (12) at the top, a threaded bottle cap assembly (2) comprising an inner threaded part (21) matched with the outer threaded part (11) and a valve rod through hole at the top, a three-level sealing system comprising: a first threaded sealing formed by the meshing of the outer threaded part (11) and the inner threaded part (21), an annular sealing groove (23) and an elastic sealing ring (24) located at the bottom end of the bottle cap assembly, the elastic sealing ring (24) being in pressure contact with the annular sealing end face (12) of the bottle body (1) to form a second end face sealing, an annular groove (25) and an O-shaped sealing ring (26) arranged on the inner wall of the valve rod through hole, the O-shaped sealing ring (26) being in contact with a valve rod (33) penetrating through to form a third radial sealing, a valve mechanism (3) comprising: an axially movable valve rod (33) extending to the inside of the bottle body (1) and sleeving a reset spring (32), a guide limiting ring (34) arranged on the upper part of the valve rod (33), a buffer gasket being arranged between the guide limiting ring (34) and the inner surface of the top of the bottle cap assembly (2), a positioning boss (22) arranged on the inner side of the bottle cap assembly (2), the outer diameter of the positioning boss (22) being matched with the inner diameter of the top end of the bottle body (1) with a gap, and the bottom end face of the positioning boss (22) bearing the elastic sealing ring (24). The bottom of the bottle body (1) is provided with radially and uniformly distributed inwardly recessed support ribs (13). The outer side wall of the bottle cap assembly (2) is provided with a diamond grid-shaped anti-slip knurling. The valve mechanism (3) further comprises a liquid inlet pipeline (31) connected with the lower end of the valve rod (33), one end of the reset spring (32) abutting against the lower end flange of the valve rod (33), and the other end of the reset spring (32) sleeving the enlarged diameter part of the liquid inlet pipeline (31). The valve rod (33) is integrally injection molded by using polyoxymethylene copolymer, comprising a hollow pipe body (332) and a reinforcing ring structure (331) arranged coaxially, and the inner diameter of the hollow pipe body (332) is in transition fit with the outer diameter of the liquid inlet pipeline (31). The root of the support rib (13) is provided with a circular arc transition structure, and the width of the support rib (13) is tapered from the root to the end. The gap fit tolerance between the positioning boss (22) and the inner wall of the bottle body (1) is H8 / f7, the bottom end face of the positioning boss (22) is provided with a trapezoidal cross-section groove accommodating the elastic sealing ring (24), and the groove depth is 2 / 3 of the diameter of the elastic sealing ring (24). ​ ​ ​ 2. The high-closure aerosol plastic squeeze container of claim 1, wherein: ​ 3. The high-closure aerosol plastic squeeze bottle of claim 1, wherein: ​ 4. The high-closure aerosol plastic squeeze bottle of claim 1, wherein: ​ 5. The high-closure aerosol plastic squeeze container of claim 4, wherein: ​ 6. The high-closure aerosol plastic squeeze container of claim 2, wherein: ​ 7. The high-closure aerosol plastic squeeze container of claim 1, wherein: ​

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