Squeezing type liquid quantitative distribution system

Abstract

The invention belongs to the technical field of packaging structure design, and discloses an extrusion type liquid quantitative distribution system which adopts a sleeve and two pistons for alternately sealing the sleeve or adopts a whole consisting of the sleeve and an opening part and two pistons for alternately sealing the whole to ensure the quantitative stability. No matter when, at least one of the two pistons is located in the sleeve (or a whole formed by the sleeve and the opening part) and is in sliding sealing fit with each other, as long as the containing cavity is extruded to compress the internal space, the pistons can be promoted to move outwards no matter how large or how small the extrusion force, the extrusion speed and the liquid viscosity are, and the piston can be driven to move outwards. The liquid outlet channel is accurately closed, quantitative distribution is achieved, and the quantitative value is kept stable, so that the problem that the quantitative function in the prior art is influenced by liquid characters and using method differences is solved, and the liquid quantitative distribution device can be suitable for using scenes which are difficult to apply in the prior art due to large viscosity changes of liquid at different temperatures, large using method differences of different consumers and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging structure design, and specifically relates to an extrusion-type liquid quantitative distribution system. Background Art

[0002] Squeeze-type dosing container lids typically form an integrated product with a matching container and its contents. Their dosing performance is closely linked to the liquid's properties, including its dynamic viscosity and temperature-dependent properties, and to the consumer's usage patterns, including the squeezing force and speed. Prior art devices primarily consist of a container, a lid, and a dosing mechanism. The dosing mechanism includes a piston, a return spring, and an active chamber, such as the dispensing container described in patent document JP2019119522A. When the consumer squeezes the container chamber, the liquid flows out of the lid through a channel at the front end of the active chamber. Simultaneously, the flowing liquid drives the piston in the active chamber forward. When the piston reaches and closes the liquid outlet channel, the liquid stops flowing, completing the dosing. Prior art devices have a simple structure but suffer from serious dosing function flaws: when the liquid's properties change, or when the consumer's squeezing speed or force changes, the piston's movement speed does not correspond to the liquid's flow rate. The higher the viscosity of the liquid, the slower the piston moves, and the more liquid flows out; vice versa. The smaller the extrusion pressure or the slower the extrusion speed, the slower the piston moves, or even stops moving with the liquid, resulting in more liquid flowing out, or even the valve never closing. As can be seen, existing technologies require stringent conditions to achieve quantitative functions and are not suitable for different actual product usage scenarios, including temperature fluctuations and different user experiences. Summary of the Invention

[0003] The present invention aims to overcome at least one defect in the prior art and provide an extrusion-type liquid quantitative dispensing system to solve the problem that the extrusion quantitative function is affected by the liquid properties or extrusion conditions.

[0004] In order to solve the above technical problems, the following technical solutions are adopted: The invention discloses an extrusion type liquid quantitative distribution system, which comprises a container having a cavity and a mouth. The cavity is easily deformed when squeezed and can restore to its original shape in time when the squeezing force is withdrawn. The system also includes a sleeve, a first piston, a second piston and a return spring coaxially mounted on the mouth, wherein the first ends of the sleeves are all facing away from the accommodating cavity and the second ends are all facing the accommodating cavity, wherein the sleeve is sealed and connected to the mouth; a limit guide portion is provided in the sleeve and is arranged at a distance from the first end of the sleeve, and the limit guide portion is provided with a through hole so that the first end and the second end of the sleeve are kept in communication; the first piston and the second piston are respectively located on both sides of the limit guide portion, the limit guide portion is provided with a first guide hole, and the second piston is provided with a second guide hole, and the second end surface of the first piston is provided with a guide column that slides with the first guide hole and slides and seals with the second guide hole, the first end of the guide column is connected to the first piston, and the second end of the guide column is provided with a limit portion to prevent the second piston from separating from the guide column; the return spring is sleeved on the guide column and is located between the limit guide portion and the second piston, the first end of the return spring abuts the limit guide portion, and the second end of the return spring abuts the second piston, so that the first piston is close to the limit guide portion and is in the sleeve, and the second piston is close to the limit portion and is outside the sleeve or the sleeve and the mouth. The first piston can be moved out of the sleeve from the first end of the sleeve, and is slidably and sealedly matched with the sleeve before moving out, and a liquid outlet channel is left between the sleeve and the sleeve after moving out; the second piston can be moved into the sleeve from the second end of the sleeve before the first piston moves out of the sleeve and is slidably and sealedly matched with the sleeve after moving in, or moved from the second end of the mouth to the mouth and is slidably and sealedly matched with the mouth after moving in, and a liquid channel is left between the sleeve and the container before moving in.

[0005] The above solution retains the characteristic usage scenario of a squeeze-type dosing container lid, namely, squeezing the container to drive the flow of the liquid and achieve liquid dispensing. Specifically, this solution utilizes a sleeve and two pistons (a first piston and a second piston) that alternately seal the sleeve, or a sleeve and mouth assembly and two pistons (a first piston and a second piston) that alternately seal the assembly, to ensure stable dosing. At all times, at least one of the two pistons is within the sleeve (or sleeve and mouth assembly), sliding and sealing with the sleeve (or sleeve and mouth assembly). Combined with the liquid sealing effect of the clearance between the sleeve (or sleeve and mouth assembly) and the piston (the first piston or the second piston), whenever the container is squeezed and the internal space is compressed, the pistons are forced outward, precisely sealing the liquid outlet channel and achieving dosing, regardless of the squeezing force, squeezing speed, or liquid viscosity. This solution also maintains a stable dosing value, thus resolving the issue of dosing being affected by differences in liquid properties and usage techniques in existing technologies. This solution can adapt to scenarios where the viscosity of liquids fluctuates significantly at different temperatures and consumer usage techniques vary widely, making existing technologies difficult to apply.

[0006] Preferably, an air return gap through which liquid cannot easily pass is provided between the outer wall of the first piston and the inner wall of the sleeve, or the first piston is provided with an air return hole through which liquid cannot easily pass, or the first piston is provided with an air return hole and a one-way valve covering the air return hole is provided on the second end face of the first piston, so as to prevent the liquid outlet channel from closing too quickly, making it difficult for external gas to fill the sleeve and affecting the speed at which the cavity returns to its original shape.

[0007] Preferably, a chamfer is provided between the second end surface of the first piston and the outer wall, and / or a chamfer is provided between the first end surface of the sleeve and the inner wall, which facilitates smoother movement of the first piston into the sleeve. A chamfer is provided between the first end surface of the second piston and the outer wall, and / or a chamfer is provided between the second end surface of the sleeve and the inner wall, which facilitates smoother movement of the second piston into the sleeve.

[0008] Preferably, the inner wall of the sleeve is provided with a closing cone surface located between the second end of the limiting guide part and the second end of the sleeve and adjacent to the limiting guide part. When the second piston is squeezed and moves to the vicinity of the limiting guide part, it will abut against the closing cone surface, which can prevent the flow of liquid.

[0009] Preferably, the sliding sealing fitting height L1 between the second piston and the sleeve / mouth portion satisfies: L1 ≥ 3 mm, so as to further improve the quantitative stability, especially for liquids with lower viscosity.

[0010] Preferably, when the second piston is immediately adjacent to the stopper, it is located within the cavity, and the inner diameter of the cavity is larger than the inner diameter of the mouth. This helps increase the initial distance between the second piston and the inner wall of the container, allowing liquid in the cavity to flow more quickly into the sleeve during pouring. More preferably, the maximum distance S1 between the second piston and the sleeve satisfies the following conditions: S1 ≥ 3mm, the maximum distance S2 between the second piston and the mouth satisfies the following conditions: S2 ≥ 3mm, and the radial distance R1 between the cavity and the second piston at least partially satisfies the following conditions: R1 ≥ 3mm.

[0011] Preferably, the system further comprises a first outer cover, which is coaxially arranged on the outside of the sleeve and is sealed with the sleeve, with the first end of the first outer cover facing away from the cavity and the second end facing the cavity; the first end of the first outer cover is provided with a liquid outlet, and the inner side of the first end of the first outer cover and / or the first end surface of the first piston is provided with a protrusion that avoids the liquid outlet, so that the liquid outlet and the inner cavity of the first outer cover are always connected; the outer diameter D1 of the first piston, the inner diameter D2 of the first outer cover, and the inner diameter D3 of the liquid outlet satisfy the following relationship: D2>D1>D3; and the axial spacing S3 between the first end of the first outer cover and the sleeve, the thickness L2 of the first piston, and the height L3 of the protrusion satisfy the following relationship: S3>L2+L3. Thus, the first outer cover forms an encircling force around the first end of the sleeve, which can moderate the liquid discharge rate through the liquid outlet, and can also limit the liquid discharge channel by limiting the travel of the first piston after it moves out of the sleeve, thereby moderating the liquid discharge rate.

[0012] Preferably, the outer wall of the sleeve is provided with a support portion and a first sealing portion, the support portion being mounted on the first end face of the mouth portion, and the first sealing portion being in sealing engagement with the mouth portion, thereby achieving a sealed connection between the sleeve and the mouth portion. The first outer cover comprises a first section remote from the cavity and a second section proximal to the cavity, the inner wall of the second section of the first outer cover being threadedly engaged with the outer wall of the mouth portion, the diameter of the first section of the first outer cover being smaller than the diameter of the second section of the first outer cover, a first step being formed between the first and second sections of the first outer cover, the first step being in sealing engagement with the support portion, thereby achieving a sealed connection between the first outer cover and the sleeve.

[0013] Preferably, the sleeve includes a first section away from the accommodating cavity and a second section close to the accommodating cavity, the diameter of the first section of the sleeve is smaller than the diameter of the second section of the sleeve, and a second step is formed between the first section and the second section of the sleeve, which is located between the first end of the limiting guide part and the second end of the sleeve; the second section of the sleeve extends a supporting part on the outside of the second step, and a deformation space is left between the supporting part and the first section of the sleeve, and the first sealing part is arranged on the outer wall of the supporting part so as to utilize the deformation space to better seal with the mouth; a second sealing part is provided on the inner side of the first step, and the outer wall of the second sealing part is sealed with the inner wall of the supporting part, thereby realizing a sealed connection between the first outer cover and the sleeve.

[0014] Preferably, the system further comprises a second outer cover, which is detachably used to seal the liquid outlet to prevent foreign matter such as dust from falling into the system, while facilitating opening the system for quantitative dispensing.

[0015] Compared with the prior art, this solution has the following advantages: It utilizes a sleeve and two pistons (a first piston and a second piston) that alternately seal the sleeve, or a sleeve and an orifice assembly and two pistons (a first piston and a second piston) that alternately seal the orifice assembly to ensure quantitative stability. At all times, at least one of the two pistons is within the sleeve (or the sleeve and orifice assembly), sliding and sealing with the sleeve (or the sleeve and orifice assembly). Combined with the liquid sealing effect of the clearance between the sleeve (or the sleeve and orifice assembly) and the piston (the first piston or the second piston), whenever the cavity is squeezed and the internal space is compressed, the pistons are forced outward, precisely sealing the liquid outlet channel and achieving quantitative dispensing, regardless of the squeezing force, squeezing speed, or liquid viscosity. This solution also maintains a stable quantitative value, thereby resolving the issue in prior art where the quantitative function is affected by differences in liquid properties and usage techniques. This solution can adapt to usage scenarios where prior art technologies are difficult to apply, such as those characterized by large changes in liquid viscosity at different temperatures and by varying usage techniques among different consumers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate the present invention, some components in the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0017] Figure 1 It is an exploded view of the squeeze-type liquid quantitative dispensing system (including the first outer cover and the second outer cover).

[0018] Figures 2-4 This is the assembly diagram of the extrusion type liquid quantitative distribution system. Figures 2 and 3 is the initial state diagram, Figure 2 The cross-section shown is Figure 3 The cut planes shown are perpendicular to each other. Figure 4 It is the extrusion state diagram.

[0019] Figures 5 and 6 This is a schematic diagram of the assembly of an extrusion-type liquid quantitative dispensing system (the sleeve and the second piston adopt other embodiments). Figure 5 is the initial state diagram, Figure 6 It is the extrusion state diagram.

[0020] Figures 7 and 8 It is a schematic diagram of the structure of the sleeve. Figure 7 It is a top view. Figure 8 It is a cross-sectional view.

[0021] Figure 9 It is a structural diagram of the second piston.

[0022] Figures 10-15 This is a schematic diagram of the use of the squeeze-type liquid quantitative distribution system. Figure 10 is the upright state diagram, Figure 11 is an inverted state diagram, Figure 12 This is the liquid channel closed state diagram, Figure 13 This is the diagram of the liquid outlet channel opening state. Figure 14 This is the liquid discharge state diagram. Figure 15 It is the emptying state diagram.

[0023] Figures 16 and 17 It is a structural diagram of the first piston. Figure 16 It is a top view. Figure 17 It is a cross-sectional view.

[0024] Figure 18 It is a structural schematic diagram of an extrusion-type liquid quantitative distribution system (the first piston adopts other implementation methods).

[0025] Figure 19 This is an assembly diagram of the squeeze-type liquid quantitative dispensing system (including the first outer cover).

[0026] Figure 20 It is a schematic diagram of the structure of an extrusion-type liquid quantitative dispensing system (the sleeve adopts other embodiments).

[0027] Figure 21 It is a structural schematic diagram of the first outer cover.

[0028] Figure 22 It is an assembly diagram of an extrusion-type liquid quantitative dispensing system (including a first outer cover and a second outer cover).

[0029] Explanation of the accompanying drawings: container 100, cavity 110, mouth 120, sleeve 200, limiting guide portion 210, through hole 211, first guide hole 212, closing cone 220, support portion 230, first sealing portion 240, first piston 300, guide column 310, limiting portion 311, return air hole 320, return air hole 330, one-way valve plate 340, second piston 400, second guide hole 410, return spring 500, first outer cover 600, liquid outlet hole 610, protrusion 620, second sealing portion 630, second outer cover 700, third sealing portion 710, liquid channel 001, liquid outlet channel 002. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present solution, the present solution is further described in detail below with reference to specific embodiments.

[0031] Figures 1 to 22 A possible squeezing type liquid quantitative dispensing system is illustrated, which drives the liquid to flow through squeezing force and drives the first piston 300 and the second piston 400 to generate a displacement of a certain distance, thereby quantitatively dispensing liquid from the container 100.

[0032] Please refer to Figure 1 The squeeze-type liquid quantitative dispensing system includes at least a container 100, a sleeve 200, a first piston 300, a second piston 400, and a return spring 500, and may also include a first outer cover 600 and a second outer cover 700. The container 100 has a cavity 110 and a mouth 120 that are interconnected. The cavity 110 is easily deformed when squeezed and can return to its original shape when the squeezing force is released.

[0033] Please refer to Figures 2 to 6 The sleeve 200, the first piston 300, the second piston 400 and the return spring 500 are all coaxially mounted on the mouth 120, with their first ends (including the mouth 120) facing away from the cavity 110 and their second ends facing the cavity 110, wherein the sleeve 200 is sealed with the mouth 120. Figures 7 and 8A position limiting guide portion 210 is provided in the sleeve 200 and is located between the first end and the second end of the sleeve 200 and is spaced apart from the first end of the sleeve 200. The position limiting guide portion 210 is provided with a through hole 211 to keep the first end and the second end of the sleeve 200 connected.

[0034] Please refer to Figures 2 to 9 The first piston 300 and the second piston 400 are respectively located on both sides of the limiting guide portion 210, the first piston 300 is located on the side where the first end of the sleeve 200 is located, and the second piston 400 is located on the side where the second end of the sleeve 200 is located. The limiting guide portion 210 is provided with a first guide hole 212, and the second piston 400 is provided with a second guide hole 410. A guide post 310 is provided on the second end surface of the first piston 300 (i.e., the side of the first piston 300 facing the limiting guide portion 210). The guide post 310 slidably engages with the first guide hole 212 and also slidably and sealingly engages with the second guide hole 410. The first end of the guide post 310 is connected to the first piston 300, and the second end is provided with a limiting portion 311. The limiting portion 311 prevents the second piston 400 from separating from the guide post 310, thereby confining the first and second pistons 300, 400, around the sleeve 200. At the same time, the first and second pistons 300, 400 can move relative to each other within a certain range of travel, and can also move relative to the sleeve 200 and the mouth 120 within a certain range of travel.

[0035] The return spring 500 is sleeved on the guide column 310 and is located between the limit guide portion 210 and the second piston 400. The first end of the return spring 500 abuts the limit guide portion 210, and the second end of the return spring 500 abuts the second piston 400, so that the first piston 300 is close to the limit guide portion 210 and is located in the sleeve 200, and the second piston 400 is close to the limit portion 311 and is located outside the sleeve 200 or the sleeve 200 and the mouth 120, so as to prevent the first piston 300 and the second piston 400 from moving at will. The return spring 500 can withstand axial pressure and shrink and deform when subjected to pressure, so that the first piston 300 and the second piston 400 will move relative to the sleeve 200 and the mouth 120 and compress the return spring 500 only when subjected to force, thereby allowing the first piston 300 to move out of the sleeve 200 from the first end of the sleeve 200, and allowing the second piston 400 to move into the sleeve 200 from the second end of the sleeve 200 or move into the mouth 120 from the second end of the mouth 120 before the first piston 300 moves out of the sleeve 200 (including when the first piston 300 moves out of the sleeve 200).

[0036] Before the first piston 300 moves out of the sleeve 200, it slides and seals with the sleeve 200, so that when the cavity 110 is squeezed, the first piston 300 can move the second piston 400 out of the container 100 under the action of pressure. Figures 2-4, before the second piston 400 is moved in, a liquid channel 001 is left between the sleeve 200 and the container 100, so that the liquid in the cavity 110 can flow into the quantitative space surrounded by the first piston 300, the sleeve 200 and the second piston 400. After the second piston 400 is moved in, it slides and seals with the sleeve 200, so that the liquid in the cavity 110 cannot continue to enter the quantitative space. At the same time, when the cavity 110 is continuously squeezed, the second piston 400 and the first piston 300 can continue to move out of the container 100 under the action of pressure. If the second piston 400 is moved to the inlet 120, as shown in FIG. Figures 5 and 6 Before the first piston 300 is moved in, a liquid channel 001 is left between the sleeve 200 and the mouth 120 to allow the liquid in the chamber 110 to flow into the quantitative space surrounded by the first piston 300, the sleeve 200, the mouth 120, and the second piston 400. After the first piston 300 is moved in, it slides and seals with the mouth 120, preventing the liquid in the chamber 110 from further entering the quantitative space. At the same time, when the chamber 110 is further squeezed, the second piston 400 and the first piston 300 can continue to move out of the container 100 under the action of pressure. After the first piston 300 is moved out of the sleeve 200, a liquid outlet channel 002 is left between the first piston 300 and the sleeve 200 to allow the liquid in the quantitative space to flow out.

[0037] It should be noted that a sliding fit refers to the ability of two mating components to slide relative to each other; a sliding, sealed fit refers to the ability of two mating components to slide relative to each other, with the liquid in the cavity being unable to pass through the gap between them. Taking the sliding, sealed fit between the first piston 300 and the sleeve 200 as an example, the outer wall of the first piston 300 can be smaller than the inner wall of the sleeve 200, leaving a gap between them. This gap is the fitting gap, and the size of this fitting gap is determined by the difficulty of liquid passing through it, specifically depending on the properties of the liquid.

[0038] When in use, the cavity 110 is filled with a liquid of a certain nature, such as Figures 10-15 The process of squeezing and quantitatively dispensing the liquid may include the following steps: S1. Hold the chamber 110 and invert the system so that the liquid outlet 610 faces downward. At this point, due to the action of the return spring 500, the first piston 300 is inside the sleeve 200, away from the first end of the sleeve 200 and close to the limiting guide 210. The second piston 400 is inside the chamber 110, outside the sleeve 200 and away from the sleeve 200. A liquid channel 001 is left between the second piston 400, the sleeve 200, the mouth 120, and the chamber 110. Under the action of gravity, the liquid in the chamber 110 can quickly fill the first open space enclosed by the sleeve 200 and the first piston 300, as shown in FIG. Figure 11 shown.

[0039] S2. Compressing chamber 110. During this process, chamber 110 deforms due to compression, causing the pressure inside chamber 110 (internal pressure) to exceed the atmospheric pressure outside chamber 110. To balance the pressure inside and outside chamber 110, the system goes through the following two stages: First, the liquid in the cavity 110 squeezes the liquid in the sleeve 200 under the action of internal pressure. The liquid in the sleeve 200 pushes the first piston 300 to move outward, and the first piston 300 pulls the second piston 400 to move in the same direction through the guide column 310. The first open space surrounded by the sleeve 200 and the first piston 300 gradually expands, and the liquid channel 001 located between the second piston 400 and the sleeve 200 gradually shrinks. Under the action of internal pressure and its own weight, the liquid in the cavity 110 continuously flows from the gradually shrinking liquid channel 001 into the gradually expanding first open space. When the first piston 300 is about to move out of the sleeve 200, the second piston 400 moves into the sleeve 200 and immediately closes the liquid channel 001. The liquid in the chamber 110 can no longer bypass the second piston 400 and flow into the sleeve 200 between the first piston 300 and the second piston 400. The first open space becomes a closed space surrounded by the sleeve 200, the first piston 300 and the second piston 400. The closed space is filled with liquid, thereby achieving quantitative determination and ensuring quantitative stability. Regardless of the viscosity of the liquid and the extrusion conditions, the quantitative effect will not be affected. Figure 12 shown.

[0040] Then, the liquid in the chamber 110 pushes the second piston 400 and the guide post 310 to continue to move outward under the action of the internal pressure. The second piston 400 pushes the liquid in the enclosed space to move in the same direction. The guide post 310 and the liquid in the enclosed space push the first piston 300 to continue to move in the same direction. Under the action of the thrust, the first piston 300 moves out of the sleeve 200 and gradually moves away from the sleeve 200, leaving a liquid outlet channel 002 between the first piston 300 and the sleeve 200. Figure 13 As shown, the closed space becomes a second open space surrounded by the sleeve 200 and the second piston 400. The liquid in the second open space is discharged from the system through the liquid outlet channel 002 under the action of gravity and pressure. Figure 14 After the liquid in the second open space is drained, even if the cavity 110 continues to be squeezed, no liquid will continue to flow out, thereby achieving quantitative distribution. Figure 15 shown.

[0041] Among them, the first open space, the closed space and the second open space are three states of quantitative space.

[0042] The above solution retains the typical usage scenario of a squeeze-type quantitative container cap, namely, squeezing the container 100 to drive the flow of the liquid within and achieve liquid dispensing. Specifically, this solution utilizes a sleeve 200 and two pistons (a first piston 300 and a second piston 400) that alternately seal the sleeve 200, or a combination of the sleeve 200 and the mouth 120 and two pistons (a first piston 300 and a second piston 400) that alternately seal the entirety of the sleeve 200 to ensure stable quantitative dispensing. At any time, at least one of the two pistons is in the sleeve 200 (or the whole formed by the sleeve 200 and the mouth 120), and is slidingly sealed with the sleeve 200 (or the whole formed by the sleeve 200 and the mouth 120). In addition, the liquid has a liquid sealing effect on the clearance between the sleeve 200 (or the whole formed by the sleeve 200 and the mouth 120) and the piston (the first piston 300 or the second piston 400). As long as the cavity 110 is squeezed and the internal space is compressed, no matter how large or small the squeezing force, squeezing speed, or liquid viscosity is, the piston will be prompted to move outward, accurately closing the liquid outlet channel 002, realizing quantitative distribution, and the quantitative value remains stable, thereby solving the problem that the quantitative function of the prior art is affected by differences in liquid properties and usage techniques, and can adapt to usage scenarios where the prior art is difficult to apply due to large changes in liquid viscosity at different temperatures and large differences in usage techniques among different consumers.

[0043] After the extrusion and quantitative dispensing are completed and the extrusion force is released, the chamber 110 returns to its original state, with the internal space expanding and the air pressure decreasing to less than atmospheric pressure. Under the dual action of atmospheric pressure and the return spring 500, the first piston 300 and the second piston 400 return to their initial positions, with the first piston 300 adjacent to the limiting guide 210 and within the sleeve 200, and the second piston 400 adjacent to the limiting portion 311 and outside the sleeve 200. Before the first piston 300 moves into the sleeve 200, ambient air rapidly enters the sleeve 200 through the liquid outlet channel 002, and then re-enters the chamber 110 as the first and second pistons 300, 400, return to their original positions. In order to prevent the liquid outlet channel 002 from closing too quickly, which makes it difficult for the external gas to fill the sleeve 200 and affect the speed of the cavity 110 returning to its original shape, a return air gap (not shown) can be arranged between the outer wall of the first piston 300 and the inner wall of the sleeve 200, or a return air hole 320 (such as Figures 16 and 17 ), a return air hole 330 may be provided on the first piston 300 and a one-way valve plate 340 covering the return air hole 330 may be provided on the second end surface of the first piston 300 (eg Figure 18). Both the return air gap and the return air hole 320 only allow gas to pass through, but not liquid. The size of the return air gap and the return air hole 320 can be set according to the properties of the liquid contained in the cavity 110. If the liquid has poor fluidity, the return air gap or the return air hole 320 can be appropriately increased to speed up the return air speed. If the liquid has good fluidity, the return air gap or the return air hole 320 needs to be appropriately reduced to ensure that the liquid does not easily pass through the return air gap or the return air hole 320. The one-way valve plate 340 is arranged on the second end face of the first piston 300. When the internal gas and liquid squeeze the one-way valve plate 340 from the inside to the outside, the one-way valve plate 340 cannot be opened due to the obstruction of the first piston 300, thereby preventing the internal gas and liquid from passing through. When the external gas squeezes the one-way valve plate 340 from the outside to the inside through the return air hole 330, the one-way valve plate 340 can flip inward without obstruction, thereby allowing external gas to pass through.

[0044] The first piston 300 and the second piston 400 need to repeatedly move in and out of the sleeve 200. To improve the smoothness of the process of the first piston 300 moving into the sleeve 200, a chamfer can be configured between the second end surface of the first piston 300 and the outer wall, or between the first end surface of the sleeve 200 and the inner wall. Chamfers can also be configured at the aforementioned positions of the first piston 300 and the aforementioned positions of the sleeve 200. Figure 4 and Figure 6 Similarly, to improve the smoothness of the second piston 400 moving into the sleeve 200, a chamfer may be configured between the first end surface of the second piston 400 and the outer wall, or between the second end surface of the sleeve 200 and the inner wall, or both of the aforementioned positions of the second piston 400 and the sleeve 200. Figure 2 and Figure 5 .

[0045] Please refer to Figure 4 and Figure 6 The inner wall of the sleeve 200 can be provided with a closing cone 220, which is located between the second end of the limiting guide portion 210 and the second end of the sleeve 200 and is adjacent to the limiting guide portion 210. When the second piston 400 is squeezed and moves to the vicinity of the limiting guide portion 210, it will abut against the closing cone 220, thereby preventing the flow of liquid. Figure 7 The fitting height L1 of the second piston 400 and the sleeve 200 or the mouth 120 for sliding sealing is preferably controlled to be above 3 mm, so as to further improve the quantitative stability, especially for liquids with lower viscosity.

[0046] Please refer to Figure 3 and Figure 5When the second piston 400 is in close proximity to the stopper 311, it is located within the chamber 110. The inner diameter of the chamber 110 is larger than the inner diameter of the mouth 120. This helps increase the initial distance between the second piston 400 and the inner wall of the container 100, allowing the liquid in the chamber 110 to flow into the sleeve 200 more quickly during pouring. Specifically, when the second piston 400 is in close proximity to the stopper 311, the distance between the second piston 400 and the sleeve 200 reaches its maximum, and the distance between the second piston 400 and the mouth 120 also reaches its maximum. Therefore, when the second piston 400 is in close proximity to the stopper 311, the distance between the second piston 400 and the sleeve 200 is the maximum distance S1 between the second piston 400 and the sleeve 200, and when the second piston 400 is in close proximity to the stopper 311, the distance between the second piston 400 and the mouth 120 is the maximum distance S2 between the second piston 400 and the mouth 120. The maximum spacing S1 between the second piston 400 and the sleeve 200 preferably satisfies the following requirements: S1 ≥ 3 mm. The maximum spacing S2 between the second piston 400 and the mouth 120 preferably satisfies the following requirements: S2 ≥ 3 mm. The radial spacing R1 between the cavity 110 and the second piston 400 at least partially satisfies the following requirements: R1 ≥ 3 mm. It is understood that a gap of spacing R1 exists between the cavity 110 and the second piston 400. When the system is tipped, liquid primarily flows from the underside of this gap into the sleeve 200. Therefore, as long as the gap spacing R1 on the underside exceeds 3 mm when the system is tipped, rapid liquid flow can be facilitated, especially when the container 100 is designed to clearly identify the tipping direction (e.g., with a bent neck).

[0047] Please refer to Figures 7 and 8 The limiting guide portion 210 may include a guide sleeve and a plurality of reinforcing ribs arranged around the guide sleeve, one end of the reinforcing rib is connected to the outer wall of the guide sleeve, and the other end is connected to the inner wall of the sleeve 200, and a gap is left between two adjacent reinforcing ribs to form a through hole 211, and the hole of the guide sleeve constitutes a first guide hole 212.

[0048] Please refer to Figure 19The first outer cover 600 is coaxially arranged on the outside of the sleeve 200 and is sealed with the sleeve 200. The first end of the first outer cover 600 faces away from the cavity 110, and the second end faces the cavity 110, wherein the first end is closed to form a first end. The axial distance S3 between the first end of the first outer cover 600 and the sleeve 200 and the thickness L2 of the first piston 300 satisfy: S3>L2, the outer diameter D1 of the first piston 300 and the inner diameter D2 of the first outer cover 600 satisfy: D1≤D2, ensuring that the first piston 300 can be moved out of the sleeve 200, and after moving out, a liquid outlet channel 002 can be left between the first piston 300 and the sleeve 200. The first outer cover 600 is provided with a liquid outlet hole 610, which is connected to the liquid outlet channel 002. Thus, the first outer cover 600 forms a surrounding pattern around the first end of the sleeve 200, which can moderate the liquid discharge rate through the liquid outlet 610. It can also limit the travel of the first piston 300 after it exits the sleeve 200, thereby restricting the liquid discharge channel 002 and thus moderating the liquid discharge rate. The size of the liquid discharge channel 002 can be determined based on the properties of the liquid being filled. It can be designed to be larger for liquids with higher viscosity and smaller for liquids with lower viscosity. It can generally be controlled to be approximately 1 to 5 mm.

[0049] The liquid outlet 610 can be arranged on the side wall of the first outer cover 600 (not shown), or on the first end portion of the first outer cover 600 (not shown). Figure 19If the liquid outlet hole 610 is disposed on the side wall of the first outer cover 600, the liquid outlet hole 610 can be positioned directly opposite the liquid outlet channel 002 or offset from the liquid outlet channel 002. If the liquid outlet hole 610 is disposed on the side wall of the first outer cover 600, offset from the liquid outlet channel 002, the outer diameter D1 of the first piston 300 and the inner diameter D2 of the first outer cover 600 must satisfy the following relationship: D1 < D2. This allows the liquid outlet channel 002 to be extended between the inner wall of the first outer cover 600 and the first piston 300, ensuring communication between the liquid outlet hole 610 and the liquid outlet channel 002. If the liquid outlet 610 is arranged at the first end of the first outer cover 600, a protrusion 620 that avoids the liquid outlet 610 needs to be arranged between the inner side of the first end of the first outer cover 600 and the first end surface of the first piston 300 to prevent the first piston 300 from approaching the first end of the first outer cover 600 and blocking the liquid outlet 610, so that the liquid outlet 610 and the inner cavity of the first outer cover 600 are always connected. In addition, the axial distance S3 between the first end of the first outer cover 600 and the sleeve 200, the thickness L2 of the first piston 300, and the height L3 of the protrusion 620 must satisfy the following relationship: S3>L2+L3. The outer diameter D1 of the first piston 300, the inner diameter D2 of the first outer cover 600, and the inner diameter D3 of the liquid outlet 610 must satisfy the following relationship: D2>D1>D3. In this way, the liquid outlet channel 002 can be extended between the inner surface of the first outer cover 600 and the first piston 300, ensuring that the liquid outlet 610 and the liquid outlet channel 002 are connected. Specifically, the convex portion 620 can be arranged on the inner side of the first end portion of the first outer cover 600 , or on the first end surface of the first piston 300 , or on both the inner side of the first end portion of the first outer cover 600 and the first end surface of the first piston 300 .

[0050] Please refer to Figures 19-21 The outer wall of the sleeve 200 can be configured with a support portion 230 and a first sealing portion 240. The support portion 230 is suspended on the first end surface of the mouth portion 120. The first sealing portion 240 is sealed with the mouth portion 120, thereby achieving a sealed connection between the sleeve 200 and the mouth portion 120. The first outer cover 600 can be configured as a stepped structure. The first outer cover 600 includes a first section away from the cavity 110 and a second section close to the cavity 110. The inner wall of the second section of the first outer cover 600 is threadedly engaged with the outer wall of the mouth portion 120. The diameter of the first section of the first outer cover 600 is smaller than the diameter of the second section of the first outer cover 600. A first step is formed between the first and second sections of the first outer cover 600. The first step is sealed with the support portion 230, thereby achieving a sealed connection between the first outer cover 600 and the sleeve 200.

[0051] Please refer to Figure 19The sleeve 200 can also be configured as a stepped structure, namely, the sleeve 200 includes a first section distal from the cavity 110 and a second section proximal to the cavity 110. The diameter of the first section of the sleeve 200 is smaller than that of the second section, forming a second step between the first and second sections. This second step is located between the first end of the position-limiting guide 210 and the second end of the sleeve 200. Before the first piston 300 is removed from the sleeve 200, it slides and seals with the first section of the sleeve 200. Once the second piston 400 is inserted into the sleeve 200, it slides and seals with the second section of the sleeve 200. The second section of the sleeve 200 extends outward from the second step toward the first end of the sleeve 200 to form the aforementioned support portion 230, thereby creating a deformation space between the support portion 230 and the first section of the sleeve 200. The first sealing portion 240 can be disposed on the outer wall of the support portion 230 to utilize this deformation space for a better sealing engagement with the mouth 120. A second sealing portion 630 may be disposed on the inner side of the first step. The outer wall of the second sealing portion 630 seals with the inner wall of the support portion 230 , thereby achieving a sealed connection between the first outer cover 600 and the sleeve 200 .

[0052] Please refer to Figure 22 The second outer cover 700 detachably closes the liquid outlet 610 to prevent dust and other foreign matter from falling into the system, and facilitates opening the system for quantitative distribution. Specifically, the liquid outlet 610 can be coaxially arranged at the first end of the first outer cover 600, and the second outer cover 700 can be coaxially covered on the outside of the first outer cover 600, so that the inner wall of the second outer cover 700 can be threadedly engaged with the outer wall of the first outer cover 600 to detachably close the liquid outlet 610. In addition, the second outer cover 700 can also detachably close the liquid outlet 610 in other forms, such as directly snapping on the first outer cover 600. The first end of the second outer cover 700 faces away from the cavity 110, and the second end faces the cavity 110, wherein the first end is closed to form the first end. A third sealing portion 710 can be arranged on the inner side of the first end of the second outer cover 700, and the outer wall of the third sealing portion 710 is sealed with the inner wall of the liquid outlet 610.

[0053] Obviously, the above embodiments of this solution are merely examples for the purpose of clarifying this solution and are not intended to limit the implementation of this solution. Those skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this solution shall be included within the scope of protection of the claims of this solution.

Claims

1. A squeeze-type liquid quantitative dispensing system, comprising a container having a cavity and a mouth, wherein the cavity is easily deformed when squeezed and can promptly return to its original shape when the squeezing force is removed, characterized in that: The system also includes a sleeve, a first piston, a second piston and a return spring coaxially mounted on the mouth, the first ends of which are all facing away from the accommodating cavity and the second ends of which are all facing the accommodating cavity, wherein the sleeve is sealed and connected to the mouth; a limiting guide portion is provided in the sleeve and is arranged at a distance from the first end of the sleeve, and the limiting guide portion is provided with a through hole so that the first end and the second end of the sleeve are kept in communication; the first piston and the second piston are respectively located on both sides of the limiting guide portion, the limiting guide portion is provided with a first guide hole, and the second piston is provided with a second guide hole, and the second end surface of the first piston is provided with a guide column that slides with the first guide hole and slides and seals with the second guide hole, the first end of the guide column is connected to the first piston, and the second end of the guide column is provided with a limiting portion to prevent the second piston from separating from the guide column; the return spring is sleeved on the The guide column is located between the limit guide part and the second piston, the first end of the return spring is against the limit guide part, and the second end of the return spring is against the second piston, so that the first piston is close to the limit guide part and is in the sleeve, and the second piston is close to the limit part and is in the sleeve or outside the sleeve and the mouth; the first piston can be moved out of the sleeve from the first end of the sleeve, and before moving out, it slides and seals with the sleeve, and after moving out, a liquid outlet channel is left between it and the sleeve; the second piston can be moved into the sleeve from the second end of the sleeve before the first piston is moved out of the sleeve and slides and seals with the sleeve after moving in, or moved into the mouth from the second end of the mouth and slides and seals with the mouth after moving in, and liquid channels are left between it and the sleeve and the container before moving in.

2. The extrusion type liquid quantitative dispensing system according to claim 1, characterized in that: There is an air return gap between the outer wall of the first piston and the inner wall of the sleeve, through which liquid cannot easily pass; or the first piston is provided with an air return hole, through which liquid cannot easily pass; or the first piston is provided with an air return hole and a one-way valve covering the air return hole is provided on the second end face of the first piston.

3. The extrusion type liquid quantitative dispensing system according to claim 1, characterized in that: A chamfer is provided between the second end face of the first piston and the outer wall, and / or a chamfer is provided between the first end face of the sleeve and the inner wall; a chamfer is provided between the first end face of the second piston and the outer wall, and / or a chamfer is provided between the second end face of the sleeve and the inner wall.

4. The squeeze-type liquid quantitative dispensing system according to claim 1, characterized in that: The inner wall of the sleeve is provided with a closing cone surface located between the second end of the limiting guide portion and the second end of the sleeve and adjacent to the limiting guide portion; and / or the sliding sealing fitting height L1 of the second piston and the sleeve / mouth portion satisfies: L1 ≥ 3mm.

5. The squeeze-type liquid quantitative dispensing system according to claim 1, characterized in that: When the second piston is close to the limiting portion, it is located in the accommodating cavity, and the inner diameter of the accommodating cavity is greater than the inner diameter of the mouth.

6. The squeeze-type liquid quantitative dispensing system according to claim 5, characterized in that: The maximum distance S1 between the second piston and the sleeve satisfies: S1 ≥ 3 mm, the maximum distance S2 between the second piston and the mouth satisfies: S2 ≥ 3 mm, and the radial distance R1 between the cavity and the second piston at least partially satisfies: R1 ≥ 3 mm.

7. The extrusion type liquid quantitative dispensing system according to any one of claims 1 to 6, characterized in that: The system also includes a first outer cover, which is coaxially arranged on the outside of the sleeve and sealed with the sleeve, with the first end of the first outer cover facing away from the cavity and the second end facing the cavity; the first end of the first outer cover is provided with a liquid outlet, and the inner side of the first end of the first outer cover and / or the first end surface of the first piston is provided with a convex portion avoiding the liquid outlet, so that the liquid outlet is always connected with the inner cavity of the first outer cover; the outer diameter D1 of the first piston, the inner diameter D2 of the first outer cover and the inner diameter D3 of the liquid outlet satisfy the following conditions: D2>D1>D3; the axial distance S3 between the first end of the first outer cover and the sleeve, the thickness L2 of the first piston and the height L3 of the convex portion satisfy the following conditions: S3>L2+L3.

8. The squeeze-type liquid quantitative dispensing system according to claim 7, characterized in that: The outer wall of the sleeve is provided with a supporting portion and a first sealing portion, the supporting portion is hung on the first end face of the mouth, and the first sealing portion is sealed in cooperation with the mouth; the first outer cover includes a first section away from the cavity and a second section close to the cavity, the inner wall of the second section of the first outer cover is threadedly engaged with the outer wall of the mouth, the diameter of the first section of the first outer cover is smaller than the diameter of the second section of the first outer cover, and a first step is formed between the first section and the second section of the first outer cover, and the first step is sealed in cooperation with the supporting portion.

9. The squeeze-type liquid quantitative dispensing system according to claim 8, characterized in that: The sleeve includes a first section away from the accommodating cavity and a second section close to the accommodating cavity. The diameter of the first section of the sleeve is smaller than the diameter of the second section of the sleeve. A second step is formed between the first section and the second section of the sleeve and is located between the first end of the limiting guide part and the second end of the sleeve; the second section of the sleeve extends the support part on the outside of the second step, and a deformation space is left between the support part and the first section of the sleeve. The first sealing part is arranged on the outer wall of the support part; a second sealing part is provided on the inner side of the first step, and the outer wall of the second sealing part is sealed with the inner wall of the support part.

10. The squeeze-type liquid quantitative dispensing system according to claim 7, characterized in that: The system further includes a second outer cover, which is configured to detachably close the liquid outlet.

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