Double-layer extruded liquid outlet bottle

Abstract

The utility model discloses a double -layer extrusion formula liquid outlet bottle, aims at solving traditional single -layer extrusion bottle liquid pollution, liquid outlet is not steady, backflow pollution etc. It includes elastic bottle body, the flexible bag (liquid storage and top sealed with bottle mouth) of inside setting, the bottle lid with liquid outlet channel, and there is one -way liquid outlet valve (prevent backflow and air into bag) in liquid outlet channel, and the bottle body outer wall is equipped with one -way breathing valve (only allow external air to enter bottle and the space between flexible bag), when extruding bottle body, internal air pressure rises and forces flexible bag, and liquid is discharged through one -way liquid outlet valve, after removing force, external air enters in through one -way breathing valve, and bottle body restores, and flexible bag keeps collapse, guarantees liquid hygiene and liquid outlet stability, is applicable to food, daily use chemical, medical treatment etc.

Description

Technical Field

[0001] This utility model relates to the fields of food, daily chemicals, and medical treatment, and specifically to a double-layered squeeze-type liquid dispensing bottle. Background Technology

[0002] In the food, daily chemical, and medical fields, squeeze-type dispensing bottles are widely used for storing and dispensing liquids such as sauces, hand sanitizers, and medicines due to their ease of operation and controllable dispensing. However, traditional squeeze-type dispensing bottles mostly adopt a single-layer structure design, with the liquid in direct contact with the bottle's interior. This design has several technical shortcomings over long-term use, making it difficult to meet the high requirements for storage hygiene, liquid stability, and dispensing reliability. Specific problems are as follows:

[0003] I. High risk of liquid contamination and spoilage

[0004] Traditional single-layer squeeze bottles are mostly made of plastic. Some liquids (such as acidic sauces, alcohol-containing cosmetics, and medicines) may undergo physical or chemical reactions with the bottle material, causing components from the bottle to migrate into the liquid, affecting the purity and safety of the liquid. Furthermore, the single-layer structure lacks an insulating design. After each squeeze, the bottle's elasticity allows outside air to be drawn in from the opening. This air enters the bottle and comes into direct contact with the liquid, easily leading to oxidation and spoilage (such as oxidation and deterioration of cooking oils and medicines) and bacterial growth (such as excessive microorganisms in sauces and skincare products). This is especially problematic for liquids intended for long-term use after opening, significantly shortening the storage period and resulting in a marked decrease in user experience and safety.

[0005] 2. Poor liquid stability and easy residue.

[0006] Traditional squeeze bottles rely on the bottle's own elasticity to dispense liquid, with the dispensing pressure entirely controlled by hand pressure. Uneven pressure can easily lead to inconsistent dispensing volumes and splashing, making it difficult to meet precise dispensing needs (such as quantitative dispensing of medical disinfectants or precise application of cosmetic essences). Furthermore, the single-layer bottle has a large contact area between the inner wall and the liquid, and the bottom and corners are prone to forming dead zones, resulting in significant liquid residue. This not only causes waste but also allows bacteria to grow and contaminate subsequent refills due to prolonged residue retention.

[0007] III. The problems of liquid reflux and secondary air pollution are prominent.

[0008] Traditional squeeze bottles lack an effective one-way control structure. When squeezing stops, the negative pressure created by the bottle returning to its original shape causes some of the dispensed liquid to flow back into the bottle. This backflowing liquid may have come into contact with external contaminants (such as hands or dust on a table), thus contaminating the remaining liquid inside. Simultaneously, impurities and microorganisms from outside air drawn in by the negative pressure can also directly enter the bottle, creating a vicious cycle of "squeezing-backflow-contamination." This type of contamination can pose health risks, especially in the medical and food industries.

[0009] IV. Insufficient adaptability to special scenarios

[0010] For scenarios requiring inverted or tilted use (such as emptying the bottle when the remaining liquid is low, or precisely targeting a specific area for dispensing), the shortcomings of traditional squeeze bottles are more pronounced. When inverted, liquid easily leaks from the bottle opening; when tilted and squeezed, the internal air pressure is unstable, resulting in insufficient dispensing pressure and intermittent dispensing. Furthermore, air can easily enter the bottle with the liquid flow, further exacerbating oxidation and contamination. In addition, the elastic material of traditional bottles is mostly ordinary plastic, which is prone to elastic fatigue after repeated compression over a long period, preventing the bottle from fully returning to its original shape and significantly reducing subsequent dispensing efficiency.

[0011] In response to the technical pain points of traditional squeeze-type dispensing bottles, the industry urgently needs a new dispensing bottle structure that can achieve isolated liquid storage, precise unidirectional dispensing, avoid contact between air and liquid, and adapt to multiple scenarios. This would solve problems such as liquid contamination, unstable dispensing, and large residues, and meet the stringent requirements for liquid storage and retrieval in the food, medical, and other fields. Utility Model Content

[0012] This utility model provides a double-layered squeeze-type liquid dispensing bottle, comprising:

[0013] The bottle body is made of elastic material. The bottle body deforms under external force and returns to its original shape after the force is removed.

[0014] A flexible bag is disposed inside the bottle body to contain liquid, and its top is sealed to the top opening of the bottle body;

[0015] A bottle cap is installed at the top opening of the bottle body, and the bottle cap is provided with a liquid outlet channel;

[0016] A one-way discharge valve is located in the discharge channel. The one-way discharge valve allows liquid to flow from the inside of the flexible bag to the outside and prevents outside air from entering the flexible bag.

[0017] A one-way breathing valve is located on the outer wall of the bottle. The one-way breathing valve allows outside air to enter the space between the inside of the bottle and the flexible bag, and prevents gas from flowing out in the opposite direction.

[0018] When the bottle is squeezed by an external force, the internal air pressure increases, compressing the flexible bag and reducing its volume. The liquid is then discharged from the outlet channel through the one-way outlet valve. When the external force is released, external air enters the bottle through the one-way breather valve, the bottle returns to its original shape, and the flexible bag remains in its collapsed state after being squeezed, preventing liquid backflow or air from entering the flexible bag.

[0019] Furthermore, the flexible bag is made of food-grade or medical-grade flexible material, and the top of the flexible bag is sealed to the bottle opening by hot pressing, bonding, or ultrasonic welding.

[0020] Furthermore, the bottle cap is detachably installed at the top opening of the bottle body, and the bottle cap is also provided with an openable and closable sealing cap, which is connected to the bottle cap by hinge or snap-fit ​​to cover and seal the liquid outlet channel.

[0021] Furthermore, the bottle cap is provided with a recessed groove for installing a one-way dispensing valve, and the middle of the recessed groove is provided with a dispensing channel, and the inner wall of the recessed groove is provided with a ring groove.

[0022] The one-way discharge valve consists of a one-way valve and a nozzle. The one-way valve is pressed and installed in a recessed slot by the nozzle.

[0023] The one-way valve includes an annular valve body, with an elastic valve plate in the middle of the valve body. The elastic valve plate is connected to the valve body by at least three radially distributed connecting ribs. A one-way convex nozzle is provided at the top center of the elastic valve plate. A central hole is provided through the circular elastic valve plate, and the two ends of the central hole penetrate the bottom surface of the elastic valve plate and the top surface of the convex nozzle.

[0024] The outer ring of the nozzle is provided with an annular buckle that connects with the annular buckle groove. The bottom of the nozzle is provided with a valve body groove for accommodating a one-way valve. The top of the nozzle is provided with an annular protruding liquid outlet, and the inner surface of the liquid outlet is arc-shaped concave.

[0025] Furthermore, the recessed slot, one-way valve, and nozzle are all regular polygonal mechanisms;

[0026] The upper and lower surfaces of the elastic valve plate are both raised upwards, and the lower surface of the elastic valve plate is provided with a conical sealing ring that converges towards the bottom center;

[0027] The recessed slot has an upward-protruding liquid outlet channel in the middle. The inside of the liquid outlet channel is a sloping surface that fits into the conical sealing ring. A leakage hole is provided through the bottom edge of the recessed slot.

[0028] Furthermore, the one-way valve is integrally molded from silicone.

[0029] Furthermore, the one-way breathing valve includes a cylindrical valve body, with a sealing ring at one end of the inner ring of the cylindrical valve body near the outside of the bottle, and baffles on both sides of the inner ring of the cylindrical valve body near the inside of the bottle. A movable ball is located between the sealing ring and the baffles inside the cylindrical valve body, and the movable ball moves freely within the cylindrical valve body and cannot be removed.

[0030] Tilting or inverting the bottle causes the movable ball to lock the sealing ring. Then, external force squeezes the bottle, increasing the internal air pressure and causing the movable ball to block the sealing ring, preventing the gas inside the bottle from flowing out, and squeezing the flexible bag.

[0031] After the bottle is aligned, the movable ball releases the seal between itself and the sealing ring. Once the external force is released, external air enters the bottle through the gap between the block and the movable ball, and the bottle returns to its original shape.

[0032] Furthermore, the cylindrical valve body is integrally molded from silicone, and the movable ball is a silicone ball.

[0033] Furthermore, the one-way breathing valve is installed at the conical neck of the bottle body using a snap-fit ​​method.

[0034] This invention addresses the shortcomings of traditional single-bottle squeeze containers in terms of hygiene, residue, stability, and compatibility through a double-layer structure of "bottle body + flexible bag" and a multi-way valve design. Specific advantages are as follows:

[0035] 1. Zero contact between liquid and air: The flexible bag is sealed only at the top and the bottle opening, with an "air layer" between the outside of the bag and the bottle. After each compression, the bag collapses and does not expand again. Outside air only enters the air layer and never comes into contact with the liquid, completely isolating the risks of oxidation, contamination, and concentration changes.

[0036] 2. Zero backflow and zero contamination: The liquid outlet channel has a built-in silicone one-way valve that closes the moment the extrusion stops, preventing the liquid from flowing back. External microorganisms and dust are physically blocked by the one-way valve, avoiding contamination caused by backflow after the liquid is extruded.

[0037] 3. Precise quantification and stable liquid output: The squeezing pressure is evenly transmitted to the outer wall of the entire bag through the "air layer". The liquid inside the bag is discharged under equal pressure. The amount of force applied by the hand is linearly related to the liquid output, which can accurately control the liquid output. At the same time, the inner bag body collapses synchronously during squeezing, which significantly reduces waste and secondary replenishment contamination.

[0038] 4. Wide material compatibility and no migration risk: The liquid only comes into contact with the food / medical grade flexible bag (PE, silicone, etc.), and is completely isolated from the bottle plastic. It can safely contain easily migratable media such as strong acid sauces, alcohol disinfectants, and oil-based medicines.

[0039] 5. Anti-squeezing safety design: Liquid can only be dispensed by squeezing the bottle when it is inverted or tilted so that the movable ball blocks the one-way breathing valve to prevent air from escaping; in other states, the one-way breathing valve is in the open state, so even if the bottle is squeezed, the gas in the interlayer space flows out from the one-way breathing valve and cannot squeeze the bag, effectively avoiding accidental operation.

[0040] 6. Modular structure, easy to recycle and maintain: The bottle body, cap, one-way dispensing valve, and one-way breathing valve are assembled independently, simplifying the installation process. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is an external view of the double-layer squeeze-type liquid dispensing bottle of this utility model;

[0043] Figure 2 This is a cross-sectional view of a double-walled squeeze-type dispensing bottle;

[0044] Figure 3 This is a schematic diagram of a double-walled squeeze-type dispensing bottle with its cap open.

[0045] Figure 4 Exploded view of the structure of a double-walled squeeze-type liquid dispensing bottle;

[0046] Figure 5 This is a structural diagram of the cap of a double-layered squeeze-type dispensing bottle;

[0047] Figure 6 A 3D view of a one-way valve for discharging liquid;

[0048] Figure 7 for Figure 6 A three-dimensional view viewed from below;

[0049] Figure 8 A 3D view of the nozzle of a one-way discharge valve;

[0050] Figure 9 for Figure 8 A three-dimensional view viewed from below;

[0051] Figure 10 A schematic diagram of a one-way breathing valve with a movable ball inside;

[0052] Figure 11 This is a schematic diagram showing the internal liquid of the flexible bag being squeezed out by inverting the double-layered bottle of this invention. Detailed Implementation

[0053] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0054] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0055] The double-layer squeeze-type liquid dispensing bottle provided by this utility model mainly includes a bottle body 1, a flexible bag 2, a bottle cap 3, and a one-way breathing valve 4. A one-way liquid dispensing valve 32 is provided inside the bottle cap 3.

[0056] Bottle 1, serving as the outer support structure of the entire device, is made of a material with high elastic recovery properties, such as food-grade elastic plastic or silicone composite material. This type of material can not only deform rapidly under external force (such as hand squeezing) to conform to the hand's force application and compress the internal space, but also quickly return to its initial shape after the external force is removed, thanks to its excellent elastic recovery, preparing it for subsequent squeezing out of liquid.

[0057] The flexible bag 2, serving as the direct container for the liquid, is installed inside the bottle body 1, forming a double-layered "bag-in-bottle" structure. Its top is sealed to the top opening of the bottle body 1, ensuring that the liquid can only be stored inside the flexible bag 2 and will not leak into the space between the bottle body 1 and the flexible bag 2. This isolation structure effectively prevents direct contact between the liquid and the bottle body 1, reducing the risk of contamination from the bottle material. It is particularly suitable for liquids in food, pharmaceuticals, and other products with stringent storage requirements.

[0058] The bottle cap 3 is fixed to the top opening of the bottle body 1 using a suitable installation method (such as threads or snaps), serving to seal the bottle mouth and protect the internal structure. The bottle cap 3 integrates a liquid outlet channel 31 and a one-way liquid outlet valve 32. The liquid outlet channel 31 is the key path for liquid to flow from the flexible bag 2 to the outside; its inner wall is smoothed to reduce liquid flow resistance and prevent liquid residue. The one-way liquid outlet valve 32 inside the bottle cap 3 is the core component controlling the liquid flow direction. Its design allows liquid to flow only from inside the flexible bag 2 to the outside, while strictly preventing external air or contaminants from entering the flexible bag 2 in reverse, ensuring the airtightness and hygiene of the liquid storage.

[0059] The one-way breathing valve 4, as a component for regulating the air pressure in the interlayer space between the bottle body 1 and the flexible bag 2, can be flexibly installed on the outer wall of the bottle body 1 according to the actual usage scenario. Its core function is to achieve "one-way air intake", that is, to allow external air to enter the interlayer space under specific conditions, while preventing the gas in the interlayer space from flowing out in the opposite direction. By regulating the air pressure, it helps the bottle body 1 to return to its original shape, ensuring the continuity of the liquid extrusion process.

[0060] II. Work Process and Principle Details

[0061] In actual use, the workflow of this double-walled squeeze-type dispensing bottle is divided into two stages: "squeezing out liquid" and "resetting preparation". The specific process is as follows:

[0062] 1. Dispensing Stage: When the user applies external force to the bottle 1 by hand or other force-applying device, the bottle 1 deforms under the action of external force, and its internal volume shrinks, causing the air pressure in the space between the bottle 1 and the flexible bag 2 to rise rapidly. The increased air pressure will generate a uniform squeezing force on the outer wall of the flexible bag 2, forcing the volume of the flexible bag 2 to decrease synchronously. At this time, the liquid inside the flexible bag 2 generates pressure due to space compression. This pressure pushes the liquid towards the bottle opening, eventually breaking through the restriction of the one-way dispensing valve 32, and smoothly discharged to the outside through the dispensing channel 31, achieving precise dispensing. In this process, the one-way conduction characteristic of the one-way dispensing valve 32 ensures that the liquid can only flow outward and there will be no backflow.

[0063] 2. Reset Preparation Stage: After the user removes the external force applied to bottle 1, bottle 1 begins to return to its initial shape due to its own elastic restoring force. At this time, the volume of the interlayer space between bottle 1 and flexible bag 2 gradually increases, and the air pressure decreases accordingly, forming a negative pressure state. Under the action of negative pressure, external air enters the interlayer space through the air intake channel of one-way breather valve 4, replenishing the space gap caused by the bottle's reset, until the air pressure in the interlayer space is balanced with the external atmospheric pressure, and bottle 1 completely returns to its original shape, ready for the next squeeze to dispense liquid. Since the liquid has been discharged and the one-way liquid outlet valve 32 prevents external air from entering, the flexible bag 2 will remain in its collapsed state after squeezing, avoiding liquid oxidation, contamination, or backflow caused by air entering the bag, further ensuring the storage quality of the liquid.

[0064] The flexible bag 2 is preferably made of food-grade or medical-grade flexible materials, such as food-grade polyethylene film or medical-grade silicone film. These materials possess excellent chemical stability, will not react chemically with the stored liquid, and are non-toxic, odorless, and resistant to aging. They can maintain good flexibility and sealing performance for a long time, meeting the usage standards of special fields such as food and pharmaceuticals. The sealing connection between the top of the flexible bag 2 and the top opening of the bottle body 1 can be achieved using methods such as heat-press sealing, adhesive sealing, or ultrasonic welding sealing.

[0065] Three mature and reliable processes are employed to ensure a good seal:

[0066] 1) Hot-press sealing: The top edge of the flexible bag 2 and the sealing surface at the opening of the bottle 1 are heated to a molten state using heating equipment. Then, a certain pressure is applied to make the two fit tightly together. After cooling, a strong sealing structure is formed. This process is suitable for plastic bottles and flexible bags, with high sealing strength and low leakage.

[0067] 2) Adhesive Sealing: Use food-grade or medical-grade adhesive and apply it evenly between the top edge of the flexible bag 2 and the sealing surface of the bottle opening 1. The adhesive will help to seal the two together. This process is simple to operate, suitable for various material combinations, and provides a stable sealing effect.

[0068] 3) Ultrasonic welding seal: Utilizing the high-frequency mechanical energy generated by ultrasonic vibration, heat is rapidly generated at the contact area between the top edge of the flexible bag 2 and the sealing surface of the bottle body 1, achieving localized melting and welding to form a seamless seal. This process has advantages such as fast welding speed, high sealing accuracy, and no chemical residue, making it particularly suitable for medical applications with extremely high sealing quality requirements.

[0069] The bottle cap 3 and the top opening of the bottle body 1 adopt a detachable installation structure, commonly using threaded or snap-fit ​​connections. The threaded connection uses the internal thread on the inner wall of the bottle cap to engage with the external thread at the bottle body opening; simply rotate to install or remove, ensuring a secure and airtight connection. The snap-fit ​​connection uses the elastic snaps on the inner wall of the bottle cap to engage with the grooves at the bottle body opening; pressing completes installation, and removing it is as simple as gently prying the snaps, making it convenient and suitable for scenarios requiring frequent bottle opening. The detachable design facilitates cleaning and maintenance of the bottle cap's internal structure, or allows users to replace the flexible bag with a new one after the liquid in the flexible bag has been used up, improving product reusability.

[0070] The bottle cap 3 is also equipped with an openable and closable sealing cap 37, which is connected to the bottle cap 3 in two main ways: hinged and snap-fit. The hinged sealing cap is connected to the bottle cap 3 through a hinge structure, and can be opened and closed by rotating around the hinge, which is flexible and not easy to lose. The snap-fit ​​sealing cap is connected to the bottle cap 3 through a snap-fit ​​on the edge of the cap body, which can tightly cover the liquid outlet channel 31 when closed, achieving a secondary seal. The main function of the sealing cap 37 is to protect the liquid outlet channel 31 and the one-way liquid outlet valve 32 from external dust and impurities when the liquid outlet bottle is not in use, while further enhancing the overall sealing performance of the bottle cap and preventing liquid leakage due to accidental squeezing or pouring.

[0071] The one-way discharge valve 32, as a key component for controlling the liquid flow direction, consists of a one-way valve 35 and a nozzle 36. Its modular design enables precise installation and reliable sealing. Its specific structure and function are as follows:

[0072] The bottle cap 3 has a recessed groove 33 inside, which serves as the mounting base for the one-way dispensing valve 32. A dispensing channel 31 runs through the center of the recessed groove 33 to ensure smooth liquid flow. An annular groove 331 is provided on the inner wall of the groove to engage with the annular snap 361 of the nozzle 36, thus securing the nozzle 36 to the bottle cap 3. This groove-type mounting structure allows for quick assembly of the one-way dispensing valve 32, ensuring a secure connection and preventing loosening of components due to vibration or pressure during use.

[0073] The one-way valve 35 features an annular valve body 351 with a resilient valve plate 352 mounted in the center. The resilient valve plate 352 is connected to the valve body 351 by at least three radially distributed connecting ribs 353. This connection method both fixes the position of the resilient valve plate 352 and provides sufficient space for its movement, ensuring flexible deformation under liquid pressure. A raised nozzle 354 is located at the top center of the resilient valve plate 352, with a central hole penetrating through it. The two ends of the central hole penetrate the bottom surface of the resilient valve plate 352 and the top surface of the raised nozzle 354, forming a channel for liquid flow. When the liquid in the flexible bag 2 flows upward under pressure, the liquid pressure pushes the resilient valve plate 352 upward, opening the central hole. The liquid then enters the raised nozzle 354 through the central hole and eventually flows out. When the liquid stops flowing or there is reverse external pressure, the resilient valve plate 352 resets under its own elasticity, closing the central hole and preventing external air or contaminants from entering the flexible bag 2.

[0074] The nozzle 36, serving as a fixing and auxiliary component for the one-way valve 35, has an annular snap-fit ​​361 on its outer ring. This snap-fit ​​connects with the annular groove 331 on the inner wall of the recessed groove 33, tightly pressing the one-way valve 35 within the recessed groove 33 to ensure a seal between the one-way valve 35 and the groove, preventing liquid leakage from gaps. The bottom of the nozzle 36 has a valve body groove 362, whose dimensions are adapted to the annular valve body 351 of the one-way valve 35, thus accommodating the valve and enabling proper positioning. The top of the nozzle 36 has an annularly protruding outlet nozzle 363. The inner surface of the outlet nozzle 363 features an arc-shaped concave design. This structure not only guides the liquid to flow out in a concentrated manner, preventing splashing during dispensing, but also reduces liquid residue within the outlet nozzle 363, improving ease of use and hygiene.

[0075] To further enhance the sealing effect of the sealing cap 37 after it is closed, a sealing post 38 is provided on the inner side of the sealing cap 37. When the sealing cap 37 is closed, the sealing post 38 will precisely insert into the dispensing nozzle 363 of the nozzle 36, and fit tightly against the inner wall of the dispensing nozzle 363, forming a double sealing structure of "post-hole" cooperation. This design can effectively prevent external air and dust from entering the dispensing channel 31, and at the same time prevent liquid from leaking from the dispensing nozzle 363 due to the bottle being tilted, making it especially suitable for sealing protection during carrying.

[0076] To improve the stability and sealing of the one-way discharge valve 32, the recessed groove 33, the one-way valve 35, and the nozzle 36 all adopt a regular polygonal structure design (such as a regular hexagon or a regular octagon). Compared with the circular structure, the regular polygonal structure has a clear corner positioning function, which can effectively limit the rotation of the one-way valve 35 and the nozzle 36 after installation, avoid sealing failure or misalignment of the discharge channel due to component rotation during use, ensure that each component always maintains the correct relative position, and guarantee the stable operation of the discharge function.

[0077] The upper and lower surfaces of the resilient valve disc 352 both adopt an upwardly convex arc structure. This design enhances the deformation capability and reset performance of the resilient valve disc 352, ensuring that the channel can be opened quickly under liquid pressure and closed rapidly after the pressure is released. Simultaneously, the lower surface of the resilient valve disc 352 has a conical sealing ring 355 that converges towards the bottom center. The corresponding liquid outlet channel 31 in the middle of the recessed groove 33 adopts an upwardly convex structure, and the interior of the channel is designed with an inclined surface that fits against the conical sealing ring 355. When the check valve 35 is installed in place, the conical sealing ring 355 and the inclined surface of the liquid outlet channel 31 fit tightly together, forming a conical sealing structure, improving the sealing performance between the check valve 35 and the liquid outlet channel 31, and preventing liquid leakage from the contact gap between the two.

[0078] In addition, a leakage hole 332 is provided through the bottom edge of the recessed slot 33. In actual use, if a small amount of liquid leaks into the recessed slot 33 due to sealing deviation, the leakage hole 332 can guide the leaked liquid back into the flexible bag 2, preventing liquid residue in the slot from causing bacterial growth or affecting the function of the components, and further improving the hygiene and reliability of the product.

[0079] The one-way valve 35 is manufactured using a one-piece silicone molding process. The annular valve body 351, connecting rib 353, elastic valve plate 352, and raised nozzle 354 are formed in a single molding process, eliminating the need for subsequent assembly. This manufacturing process offers significant advantages: 1. High structural integrity: One-piece molding avoids gaps caused by assembling multiple parts, resulting in a tighter overall structure and significantly improved sealing performance, effectively preventing liquid leakage or the ingress of external air. 2. Stable elasticity: Silicone material itself possesses excellent elasticity and aging resistance. The one-piece molding process ensures uniform elasticity across all components, preventing stress damage during assembly from affecting the deformation and reset function of the elastic valve plate 352, thus extending product lifespan. 3. High production efficiency: The one-piece molding process simplifies the production process, reduces the number of parts processing and assembly steps, lowers production costs, and ensures consistent product quality, making it suitable for large-scale mass production.

[0080] like Figure 10As shown, the one-way breathing valve 4 consists of a cylindrical valve body 41, a sealing ring 42, a stop block 43, and a movable ball 44. The cylindrical valve body 41 serves as an external support structure and adopts a hollow design to form an airflow channel. The sealing ring 42 is located at the inner end of the cylindrical valve body 41 near the outside of the bottle and has an annular protrusion structure, which is used to cooperate with the movable ball 44 to achieve a seal. The stop block 43 is symmetrically arranged on both sides of the inner end of the cylindrical valve body 41 near the inside of the bottle, which serves to prevent the movable ball 44 from falling out, while also leaving a gap for airflow. The movable ball 44 is made of a lightweight and wear-resistant material (such as a silicone ball) and is placed inside the cylindrical valve body 41 between the sealing ring 42 and the stop block 43. It can move freely inside the cylindrical valve body 41, but is restricted by the stop block 43 and cannot fall out of the valve body.

[0081] Workflow details of one-way breathing valve 4 (based on bottle tilt / inversion and upright scenarios)

[0082] The one-way breathing valve 4, as a core component for regulating the air pressure in the space between the bottle body 1 and the flexible bag 2, requires its operation to be combined with the actual operating scenarios of "tilting / inverting and squeezing" and "releasing when upright" of the bottle body. The function of "reverse sealing" and "one-way air intake" is switched through the dynamic movement of the movable ball. The specific process details are as follows:

[0083] I. Sealing and locking process during the extrusion stage under tilted / inverted conditions

[0084] like Figure 11 As shown, when the user tilts or inverts the bottle 1 to dispense liquid, the movable ball 44 inside the one-way breather valve 4 will shift due to gravity and move towards the inner end of the cylindrical valve body 41 closer to the outside of the bottle, initially fitting against the sealing ring 42. At this time, the movable ball 44 has not completely blocked the channel of the sealing ring 42 and is only in a "pre-sealed" state, preparing for complete sealing in the subsequent squeezing stage.

[0085] When a user applies external force (such as squeezing the side wall of the bottle) to the tilted / inverted bottle 1, the bottle 1 deforms under the action of the external force, and the volume of the interlayer space between it and the flexible bag 2 shrinks rapidly, causing the internal air pressure to rise sharply. The increased air pressure will generate an outward pushing force on the movable ball 44. This pushing force, combined with the weight of the movable ball 44 itself, will push the movable ball 44 tightly against the inner side of the sealing ring 42. Since the sealing ring 42 has an annular protruding structure, the spherical surface of the movable ball 44 can completely fit with the annular contact surface of the sealing ring 42, forming a tight sealing structure, completely blocking the channel of the cylindrical valve body 41, and preventing the gas in the interlayer space from flowing out of the bottle through the one-way breather valve 4.

[0086] In this state, the gas in the interlayer cannot escape, and the air pressure remains high. This high pressure acts evenly on the outer wall of the flexible bag 2, forcing the flexible bag 2 to deform and shrink in volume. The liquid inside the flexible bag 2 is compressed by the space, generating pressure that eventually breaks through the restriction of the one-way liquid outlet valve 32 and is smoothly discharged through the liquid outlet channel 31. Throughout the process, the one-way breather valve 4 achieves "pressure-locked sealing" of the interlayer space through the tight fit between the movable ball 44 and the sealing ring 42, ensuring that all the air pressure generated by the compression is used to compress the flexible bag 2, avoiding problems such as insufficient liquid outlet pressure and unstable liquid outlet volume due to gas leakage.

[0087] II. In the correct orientation state: Intake reset procedure during the release phase

[0088] When the liquid is discharged to the required dose, and the user stops squeezing and returns bottle 1 to its upright position, the one-way breathing valve 4 enters the "air intake reset" stage. First, the user removes the external force applied to bottle 1, and bottle 1 begins to return to its initial shape due to its own elastic restoring force. The volume of the interlayer space gradually increases, and the internal air pressure decreases accordingly, forming a negative pressure state lower than the external atmospheric pressure.

[0089] At this point, the air pressure thrust on the movable ball 44 disappears, and it is only subject to its own gravity. Since the bottle body 1 has been restored to its upright position, the direction of gravity of the movable ball 44 becomes downward (i.e., towards the inner end of the cylindrical valve body 41 closer to the inside of the bottle). Under the action of gravity, the movable ball 44 disengages from the sealing ring 42 and moves towards the stop block 43 inside the cylindrical valve body 41. When the movable ball 44 falls to contact the stop block 43, the stop block 43 will provide support and limit the movable ball 44, preventing it from moving further into the bottle (to prevent the movable ball 44 from falling out of the cylindrical valve body 41). At this time, the movable ball 44 is in a "suspended support" state, forming a clear gap with the sealing ring 42.

[0090] Under atmospheric pressure, external air enters the cylindrical valve body 41 through the external opening of the one-way breather valve 4, and then flows into the interlayer space through the gap between the movable ball 44 and the baffle 43 (the baffle 43 is symmetrically arranged inside the cylindrical valve body 41, and an air passage is reserved when it contacts the movable ball 44). As external air continues to be replenished, the negative pressure state of the interlayer space gradually eases, and the air pressure gradually balances with the external atmospheric pressure. With the assistance of the air pressure difference, the bottle 1 accelerates back to its initial shape, preparing the structure for the next extrusion of liquid.

[0091] At the same time, due to the one-way conduction characteristic of the one-way liquid outlet valve 32, external air cannot enter the interior of the flexible bag 2 through the liquid outlet channel. The flexible bag 2 will remain in the collapsed state after being squeezed, avoiding liquid oxidation and contamination caused by air entering the bag, or affecting the subsequent liquid outlet accuracy due to air mixing and generating bubbles, thus further ensuring the hygiene and stability of liquid storage.

[0092] The cylindrical valve body 41 is manufactured using a one-piece silicone molding process. Silicone material possesses excellent elasticity, sealing properties, and aging resistance, allowing it to fit tightly against the mounting area of ​​the bottle body 1, preventing air leakage. Furthermore, silicone material is non-toxic and odorless, meeting the standards for use in the food and pharmaceutical industries. The movable ball 44 is made of silicone, which is soft and lightweight. It can move flexibly when air pressure changes and forms a good seal when fitted with the sealing ring 42. It will not wear or deform due to long-term use, ensuring the long-term reliable operation of the one-way breather valve 4.

[0093] The one-way breathing valve 4 can be installed at the conical neck of the bottle body 1 using a snap-fit ​​method. The neck of the bottle body 1 has a groove adapted to the one-way breathing valve 4, and the outer side of the cylindrical valve body 41 of the one-way breathing valve 4 has a corresponding elastic snap. During installation, simply align the one-way breathing valve 4 with the installation position at the neck of the bottle body 1 and gently press to engage the snap with the groove, thus securing it. During disassembly, simply pinch both sides of the one-way breathing valve 4 and gently pull outwards to release the snap from the groove; the operation is simple and quick. This snap-fit ​​installation method requires no additional tools, making it convenient for users to clean or replace the one-way breathing valve 4 when needed, improving product maintenance convenience. Simultaneously, the installation of the one-way breathing valve 4 at the conical neck also allows the movable ball 44 inside the one-way breathing valve 4 to roll outwards under gravity and block the central hole of the sealing ring 42 when the bottle is inverted or tilted.

[0094] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A double-walled squeeze-type dispensing bottle, characterized in that, include: The bottle body is made of elastic material. The bottle body deforms under external force and returns to its original shape after the force is removed. A flexible bag is disposed inside the bottle body to contain liquid, and its top is sealed to the top opening of the bottle body; A bottle cap is installed at the top opening of the bottle body, and the bottle cap is provided with a liquid outlet channel; A one-way discharge valve is located in the discharge channel. The one-way discharge valve allows liquid to flow from the inside of the flexible bag to the outside and prevents outside air from entering the flexible bag. A one-way breathing valve is located on the outer wall of the bottle. The one-way breathing valve allows outside air to enter the space between the inside of the bottle and the flexible bag, and prevents gas from flowing out in the opposite direction. When the bottle is squeezed by an external force, the internal air pressure increases, compressing the flexible bag and reducing its volume. The liquid is then discharged from the outlet channel through the one-way outlet valve. When the external force is released, external air enters the bottle through the one-way breather valve, the bottle returns to its original shape, and the flexible bag remains in its collapsed state after being squeezed, preventing liquid backflow or air from entering the flexible bag.

2. The double-walled squeeze-type dispensing bottle according to claim 1, characterized in that: The flexible bag is made of food-grade or medical-grade flexible material, and the top of the flexible bag is sealed to the bottle mouth by hot pressing, bonding or ultrasonic welding.

3. The double-walled squeeze-type dispensing bottle according to claim 1, characterized in that: The bottle cap is detachably installed at the top opening of the bottle body. The bottle cap is also equipped with an openable and closable sealing cap, which is connected to the bottle cap by hinge or snap-fit ​​to cover and seal the liquid outlet channel.

4. The double-walled squeeze-type dispensing bottle according to claim 1 or 3, characterized in that: The bottle cap has a recessed groove for installing a one-way dispensing valve. The middle of the recessed groove has a dispensing channel, and the inner wall of the recessed groove has a ring groove. The one-way discharge valve consists of a one-way valve and a pressure nozzle. The pressure nozzle presses the one-way valve tightly into a recessed slot. The one-way valve includes an annular valve body, with an elastic valve plate in the middle of the valve body. The elastic valve plate is connected to the valve body by at least three radially distributed connecting ribs. A one-way convex nozzle is provided at the top center of the elastic valve plate. A central hole is provided through the circular elastic valve plate, and the two ends of the central hole penetrate the bottom surface of the elastic valve plate and the top surface of the convex nozzle. The outer ring of the nozzle is provided with an annular buckle that connects with the annular buckle groove. The bottom of the nozzle is provided with a valve body groove for accommodating a one-way valve. The top of the nozzle is provided with an annular protruding liquid outlet, and the inner surface of the liquid outlet is arc-shaped concave.

5. The double-walled squeeze-type dispensing bottle according to claim 4, characterized in that: The recessed slot, one-way valve, and nozzle are all regular polygonal mechanisms. The upper and lower surfaces of the elastic valve plate are both raised upwards, and the lower surface of the elastic valve plate is provided with a conical sealing ring that converges towards the bottom center; The recessed slot has an upward-protruding liquid outlet channel in the middle. The inside of the liquid outlet channel is a sloping surface that fits into the conical sealing ring. A leakage hole is provided through the bottom edge of the recessed slot.

6. The double-walled squeeze-type dispensing bottle according to claim 4, characterized in that: The one-way valve is made of silicone in one piece.

7. The double-walled squeeze-type dispensing bottle according to claim 1, characterized in that: The one-way breathing valve includes a cylindrical valve body. A sealing ring is provided at one end of the inner circle of the cylindrical valve body near the outside of the bottle. Blocks are provided on both sides of the inner circle of the cylindrical valve body near the inside of the bottle. A movable ball is provided in the cylindrical valve body between the sealing ring and the block. The movable ball moves freely in the cylindrical valve body and cannot be removed. Tilting or inverting the bottle causes the movable ball to lock the sealing ring. Then, external force squeezes the bottle, increasing the internal air pressure and causing the movable ball to block the sealing ring, preventing the gas inside the bottle from flowing out, and squeezing the flexible bag. After the bottle is aligned, the movable ball releases the seal between itself and the sealing ring. Once the external force is released, external air enters the bottle through the gap between the block and the movable ball, and the bottle returns to its original shape.

8. The double-walled squeeze-type dispensing bottle according to claim 7, characterized in that: The cylindrical valve body is made of one-piece silicone, and the movable ball is made of silicone.

9. The double-walled squeeze-type dispensing bottle according to claim 7, characterized in that: The one-way breathing valve is installed at the conical neck of the bottle body using a snap-fit ​​method.

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