Squeeze metering cap

Abstract

The scheme belongs to the technical field of packaging structure design, and discloses a kind of extrusion ration cover, the extrusion ration cover adopts sleeve and two pistons (first piston and second piston) that alternatively seal the sleeve (or the combination of sleeve and mouth), to ensure the stability of ration. At any time, at least one of the two pistons is in the sleeve (or the combination of sleeve and mouth) and mutually sliding sealing fit, plus the liquid sealing effect of the gap during use, as long as the container is extruded to compress the internal space, no matter how much or how little the extrusion force, extrusion speed, liquid viscosity is, it will promote the piston to move outward, accurately seal the liquid passage, realize ration distribution, and the ration value remains stable, thereby solving the problem that the ration function of the prior art is affected by the difference in liquid properties and use method, and can adapt to use scenarios that the prior art cannot adapt to, such as large viscosity changes of different temperature liquids and large differences in use methods of different consumers.

Description

Technical Field

[0001] This solution belongs to the field of packaging structure design technology, specifically involving a compression metering cap. Background Technology

[0002] Squeeze-type dispensing container caps typically form an integrated product with the matching container and its contents. The dispensing performance is inextricably linked to the liquid's properties, including its dynamic viscosity and temperature response, as well as the user's method of use, including squeezing pressure and speed. Existing technology mainly consists of a container, a cap, and a dispensing device. The dispensing device comprises a piston, a return spring, and a movable chamber, as described in patent document JP2019119522A. When the consumer squeezes the container chamber, the liquid flows out of the cap through a channel at the front of the movable chamber. Simultaneously, the flowing liquid moves the piston forward within the movable chamber. When the piston reaches and closes the dispensing channel, the liquid stops flowing, thus completing the dispensing. While the existing technology has a simple structure, it suffers from a serious functional defect: 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; conversely, the lower the viscosity, the less liquid flows out. The lower 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 piston remaining open indefinitely. It is evident that existing technologies require stringent conditions to achieve quantitative functions and are not suitable for various actual usage scenarios, including variations in operating temperature or different user experiences. Utility Model Content

[0003] This solution aims to overcome at least one defect in the prior art and provide a squeeze metering cap to solve the problem that the squeeze metering function is affected by the liquid properties or squeezing conditions.

[0004] To solve the above-mentioned technical problems, the following technical solution is adopted:

[0005] A squeeze-to-dispense cap, which is installed at the mouth of a container during use, is used to dispense liquid into the container in a metered manner when the container is squeezed. The squeeze-to-measure cap includes a sleeve, a first piston, a second piston, and a return spring coaxially mounted on the opening during use. The first ends of all three pistons face away from the container interior, and the second ends face the container interior. The sleeve contains a limiting guide portion spaced apart from the first end of the sleeve. The limiting guide portion has a through hole, allowing communication between the first and second ends of the sleeve. The first and second pistons are located on opposite sides of the limiting guide portion. The limiting guide portion has a first guide hole, and the second piston has a second guide hole. The second end face of the first piston has a guide post that slides and seals with both the first and second guide holes. The first end of the guide post connects to the first piston, and the second end of the guide post has a limiting portion to prevent the second piston from detaching from the guide post. The return spring is sleeved on the guide post and located between the limiting guide portion and the second piston. The first end of the return spring abuts against the limiting guide portion, and the second end of the return spring abuts against the second piston, so that the first piston is close to the limiting guide portion and inside the sleeve, while the second piston is close to the limiting portion and outside the sleeve. When the first piston is in use, it can be moved out of the sleeve from the first end of the sleeve. Before it is moved out, it slides and seals with the sleeve. After it is moved out, a liquid outlet channel is left between it and the sleeve. When the second piston is in use, it can be moved into the sleeve from the second end of the sleeve before the first piston is moved out of the sleeve. After it is moved in, it slides and seals with the sleeve. Alternatively, it can be moved into the inlet from the outside of the inlet through the second end of the inlet. After it is moved in, it slides and seals with the inlet. Before it is moved in, a liquid channel is left between it and the sleeve and the container.

[0006] The above solution retains the usage characteristics of a squeeze-type metering container cap, namely, driving the flow of the liquid inside and completing the dispensing by squeezing the container. Specifically, this solution uses a sleeve and two pistons (a first piston and a second piston) that alternately seal the sleeve (or the sleeve-mouth assembly) to ensure metering stability. At all times, at least one of the two pistons is inside the sleeve (or the sleeve-mouth assembly), slidingly sealing against it. Combined with the liquid-sealing effect of the liquid on the gap between the sleeve (or the sleeve-mouth assembly) and the piston (first or second piston), as long as the cavity is compressed, regardless of the squeezing force, squeezing speed, or the viscosity of the liquid, the piston will move outward, precisely sealing the dispensing channel and achieving metering. The metering value remains stable, thus solving the problem that the metering function of existing technologies is affected by differences in liquid properties and usage methods. It can adapt to usage scenarios where existing technologies are difficult to apply due to large variations in liquid viscosity at different temperatures and large differences in usage methods among different consumers.

[0007] Preferably, a return gas gap is provided between the outer wall of the first piston and the inner wall of the sleeve, which makes it difficult for liquid to pass through; or the first piston is provided with a small return gas hole, which makes it difficult for liquid to pass through; or the first piston is provided with a return gas hole and a one-way valve plate covering the return gas hole is provided on the second end face of the first piston, so as to prevent the liquid outlet channel from closing too quickly, which would make it difficult for the outside gas to fill the sleeve and affect the speed at which the container returns to its original shape.

[0008] Preferably, 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, which helps to improve the smoothness of the process of the first piston moving into the sleeve. 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, which helps to improve the smoothness of the process of the second piston moving into the sleeve.

[0009] Preferably, the inner wall of the sleeve is provided with a closing cone surface located between the second end of the limiting guide and the second end of the sleeve and adjacent to the limiting guide. When the second piston is squeezed and moves to the vicinity of the limiting guide, it will abut against the closing cone surface, which can prevent the flow of liquid.

[0010] Preferably, the sliding seal fit height L1 between the second piston and the sleeve / mouth satisfies: L1≥3mm, so as to further improve the stability of metering, especially for liquids with low viscosity.

[0011] Preferably, the maximum distance S1 between the second piston and the sleeve and the maximum distance S2 between the second piston and the opening during use satisfy: S1≥3mm and S2≥3mm, so that the liquid can flow into the sleeve more quickly when inverted.

[0012] Preferably, the compression metering cap further includes a first outer cap, which is coaxially mounted on the outside of the sleeve and sealed to the sleeve. In use, the first end of the first outer cap faces away from the inside of the container, and the second end faces the inside of the container. The first end of the first outer cap has a liquid outlet hole, and the inner side of the first end of the first outer cap and / or the first end face of the first piston has a protrusion that avoids the liquid outlet hole, ensuring that the liquid outlet hole remains in communication with the inner cavity of the first outer cap. The outer diameter D1 of the first piston, the inner diameter D2 of the first outer cap, and the inner diameter D3 of the liquid outlet hole satisfy the following relationship: D2 > D1 > D3. The axial distance S3 between the first end of the first outer cap 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 cap surrounds the first end of the sleeve, which can moderate the liquid discharge rate through the liquid outlet hole and limit the liquid outlet channel by restricting the stroke of the first piston after it moves out of the sleeve, thereby moderating the liquid discharge rate.

[0013] Preferably, the outer wall of the sleeve is provided with a support portion and a first sealing portion. The support portion is used to abut against the first end face of the container opening so that the sleeve can be attached to the container opening. The first sealing portion is used to seal with the container opening, thereby achieving a sealed connection between the sleeve and the container opening. The first outer cover includes a first section away from the container cavity and a second section close to the container cavity when in use. The inner wall of the second section of the first outer cover is used to thread with the outer wall of the container opening. 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. A first step is formed between the first section and the second section of the first outer cover. The first step seals with the support portion, thereby achieving a sealed connection between the first outer cover and the sleeve.

[0014] Preferably, the sleeve includes a first section away from the container cavity and a second section close to the container cavity during use. 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 and second sections of the sleeve, located between the first end of the limiting guide and the second end of the sleeve. A support portion extends from the outside of the second step of the sleeve. A deformation space is left between the support portion and the first section of the sleeve. A first sealing portion is provided on the outer wall of the support portion so as to utilize the deformation space to achieve a better sealing fit with the container opening. A second sealing portion is provided on the inner side of the first step. The outer wall of the second sealing portion seals with the inner wall of the support portion, thereby achieving a sealed connection between the first outer cover and the sleeve.

[0015] Preferably, the squeeze metering cap also includes a second outer cap, which can be detachably sealed to the liquid outlet to prevent dust and other foreign objects from falling in, and is easy to open for metering.

[0016] Compared with existing technologies, this solution offers the following advantages: This solution employs a sleeve and two pistons (a first piston and a second piston) that alternately seal the sleeve (or the sleeve-mouth assembly) to ensure stable metering. At all times, at least one of the two pistons is inside the sleeve (or the sleeve-mouth assembly), sliding and sealing against it. Combined with the liquid-sealing effect of the liquid on the gap between the sleeve (or the sleeve-mouth assembly) and the piston (first or second piston), whenever the container is compressed, regardless of the pressure, speed, or viscosity of the liquid, the piston will move outward, precisely sealing the outlet channel and achieving metered dispensing with a stable metering value. This solves the problem of existing technologies' metering function being affected by liquid properties and usage methods, and can adapt to application scenarios where existing technologies are difficult to apply due to large variations in liquid viscosity at different temperatures and significant differences in usage methods among different consumers. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this solution. To better illustrate the solution, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] Figure 1 It is an exploded view of the squeeze metering cap (including the first outer cap and the second outer cap).

[0019] Figures 2-4 This is an assembly diagram of a compression dispensing cap. Among them, Figures 2-3 This is the initial state diagram. Figure 2 The cut surface shown is Figure 3 The cut surfaces shown are perpendicular to each other. Figure 4 It is a diagram of the compression state.

[0020] Figures 5-6 This is an assembly diagram of a compression metering cap (with the sleeve and second piston using other implementation methods). Wherein, Figure 5 This is the initial state diagram. Figure 6 It is a diagram of the compression state.

[0021] Figures 7-8 This is a structural diagram of the sleeve. Among them, Figure 7 It is a top view. Figure 8 It is a sectional view.

[0022] Figure 9 This is a schematic diagram of the second piston.

[0023] Figures 10-15 This is a schematic diagram illustrating the usage of the squeeze-to-measure cap. (The diagram shows the cap's position in use.) Figure 10 It is a positive state diagram. Figure 11 It is an inverted state diagram. Figure 12 This is a diagram showing the liquid channel in closed state. Figure 13 This is a diagram showing the open state of the liquid outlet channel. Figure 14 This is a diagram showing the liquid discharge status. Figure 15 This is a diagram showing the emptying status.

[0024] Figures 16-17 This is a schematic diagram of the first piston. Among them, Figure 16 It is a top view. Figure 17 It is a sectional view.

[0025] Figure 18 This is a schematic diagram of the structure of the compression metering cap (the first piston adopts other implementation methods).

[0026] Figure 19 This is an assembly diagram of the compression metering cap (including the first outer cap).

[0027] Figure 20This is a schematic diagram of the usage state of the compression metering cap (the sleeve adopts other implementation methods).

[0028] Figure 21 This is a schematic diagram of the structure of the first outer cover.

[0029] Figure 22 This is an assembly diagram of the compression metering cap (including the first outer cap and the second outer cap).

[0030] Explanation of reference numerals in the attached drawings: Container 100, cavity 110, opening 120, sleeve 200, limiting guide part 210, through hole 211, first guide hole 212, closing cone surface 220, support part 230, first sealing part 240, first piston 300, guide post 310, limiting part 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 part 630, second outer cover 700, third sealing part 710, liquid channel 001, liquid outlet channel 002. Detailed Implementation

[0031] To enable those skilled in the art to better understand this solution, the following detailed description is provided in conjunction with specific embodiments.

[0032] Figures 1-22 The illustration shows a possible squeeze-to-dispense cap and its application scenarios. In use, the squeeze-to-dispense cap is installed at the opening 120 of container 100 to dispense liquid quantitatively from the container 100 when squeezed. Container 100 has an interconnected cavity 110 and opening 120. The cavity 110 is easily deformed when squeezed and can promptly return to its original shape when the squeezing force is removed. The first end of the opening 120 faces away from the interior of container 100, and the second end faces the interior of container 100.

[0033] Please refer to Figure 1 The squeeze metering cap includes at least a sleeve 200, a first piston 300, a second piston 400, and a return spring 500, and may even include a first outer cover 600 and a second outer cover 700.

[0034] Please refer to Figures 2-6 The sleeve 200, the first piston 300, the second piston 400, and the return spring 500 are coaxially arranged and coaxially installed at the opening 120 during use. Their first ends all face away from the inside of the container 100, and their second ends all face the inside of the container 100. The sleeve 200 is sealed and connected to the opening 120. Please refer to [reference needed]. Figures 7-8The sleeve 200 is provided with a limiting guide portion 210, which is located between the first end and the second end of the sleeve 200 and is disposed at a distance from the first end of the sleeve 200. The limiting guide portion 210 is provided with a through hole 211 to keep the first end and the second end of the sleeve 200 in communication.

[0035] Please refer to Figures 2-9 The first piston 300 and the second piston 400 are located on both sides of the limiting guide portion 210, with the first piston 300 located on the side where the first end of the sleeve 200 is located and the second piston 400 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, the second piston 400 is provided with a second guide hole 410, and the second end face of the first piston 300 (i.e. the side of the first piston 300 facing the limiting guide portion 210) is provided with a guide post 310. The guide post 310 is slidably engaged with the first guide hole 212 and slidably sealed with the second guide hole 410. Moreover, 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 can prevent the second piston 400 from disengaging from the guide post 310, thereby restricting the first piston 300 and the second piston 400 around the sleeve 200. At the same time, it allows the first piston 300 and the second piston 400 to move relative to each other within a certain stroke range, and both can move relative to the sleeve 200 within a certain stroke range.

[0036] The return spring 500 is sleeved on the guide post 310 and located between the limiting guide part 210 and the second piston 400. The first end of the return spring 500 abuts against the limiting guide part 210, and the second end of the return spring 500 abuts against the second piston 400, so that the first piston 300 is close to the limiting guide part 210 and is inside the sleeve 200, and the second piston 400 is close to the limiting part 311 and is outside the sleeve 200, so as to prevent the first piston 300 and the second piston 400 from moving arbitrarily. The return spring 500 can withstand axial pressure and will contract and deform under pressure, so that the first piston 300 and the second piston 400 will only move relative to the sleeve 200 and compress the return spring 500 when force is applied. This allows the first piston 300 to move out of the sleeve 200 from the first end of the sleeve 200, and allows the second piston 400 to move into the sleeve 200 from the second end of the sleeve 200 or 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).

[0037] 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 compressed, the first piston 300 can move the second piston 400 out of the container 100 under pressure. If the second piston 400 moves into the sleeve 200, such as Figures 2-4Before insertion, liquid channels 001 are left between the piston 110 and the sleeve 200 and container 100, allowing liquid in the cavity 110 to flow into the metering space formed by the first piston 300, sleeve 200, and second piston 400. After insertion, it slides and seals with the sleeve 200, preventing liquid in the cavity 110 from continuing to enter the metering space. Simultaneously, it allows the second piston 400 and the first piston 300 to continue moving out of the container 100 under pressure when the cavity 110 continues to be compressed. If the second piston 400 moves into the inlet 120, such as... Figures 5-6 Before being moved in, a liquid channel 001 is left between the piston 110 and the sleeve 200 and the container 100, so that the liquid in the cavity 110 can flow into the metering space formed by the first piston 300, the sleeve 200, the opening 120 and the second piston 400. After being moved in, it slides and seals with the opening 120, so that the liquid in the cavity 110 can no longer enter the metering space. At the same time, when the cavity 110 is continued to be squeezed, the second piston 400 and the first piston 300 can continue to move out of the container 100 under pressure. After the first piston 300 moves out of the sleeve 200, a liquid outlet channel 002 is left between the first piston 300 and the sleeve 200, so that the liquid in the metering space can flow out.

[0038] It should be noted that a sliding fit refers to a fit where the two mating parts can slide relative to each other; a sliding sealing fit refers to a fit where the two mating parts can slide relative to each other, but the liquid inside the cavity cannot easily pass through the gap between them. Taking the sliding sealing 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, and there is a gap between them. This gap is the fitting clearance, and its size is determined based on the properties of the liquid, ensuring that the liquid cannot easily pass through.

[0039] In use, the sleeve 200 of the squeezing metering cap is coaxially and sealed to the opening 120 of the container 100. The cavity 110 of the container 100 contains a liquid of a certain nature, such as... Figures 10-15 As shown. The process of dispensing the liquid by squeezing may include the following steps:

[0040] S1. Hold the cavity 110 and invert the system so that the liquid outlet 610 faces downwards. At this time, 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 part 210, and the second piston 400 is inside the cavity 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 opening 120, and the cavity 110. The liquid in the cavity 110 can be quickly filled into the first open space enclosed by the sleeve 200 and the first piston 300 under the action of gravity, such as... Figure 11 As shown.

[0041] S2. Compression of cavity 110. During this process, the cavity 110 deforms due to compression, causing the internal pressure inside the cavity 110 to exceed the atmospheric pressure outside the cavity 110. To balance the internal and external pressures of the cavity 110, the system undergoes the following two stages:

[0042] First, the liquid in the cavity 110 is squeezed by the internal pressure, which in turn compresses the liquid in the sleeve 200. The liquid in the sleeve 200 pushes the first piston 300 to move outward. The first piston 300 pulls the second piston 400 to move in the same direction through the guide post 310. The first open space enclosed by the sleeve 200 and the first piston 300 gradually expands, while the liquid channel 001 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. As the first piston 300 is about to exit the sleeve 200, the second piston 400 moves into the sleeve 200 and immediately closes the liquid passage 001. The liquid in the cavity 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 enclosed by the sleeve 200, the first piston 300, and the second piston 400. This closed space is filled with liquid, thus achieving metering and ensuring the stability of the metering. Regardless of the liquid viscosity or extrusion conditions, the metering effect will not be affected. Figure 12 As shown.

[0043] Next, under the action of internal pressure, the liquid in the cavity 110 pushes the second piston 400 and the guide post 310 to continue moving outward. 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 moving in the same direction. Under the action of 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 enclosed space becomes a second open space formed by the sleeve 200 and the second piston 400. Under the influence of gravity and pressure, the liquid in the second open space is discharged from the system through the outlet channel 002. Figure 14 As shown. After the liquid in the second open space is drained, even if the cavity 110 continues to be compressed, no more liquid will flow out, thus achieving quantitative distribution, as... Figure 15 As shown.

[0044] Among them, the first open space, the closed space, and the second open space are the three states of a quantitative space.

[0045] The above solution retains the usage scenario characteristics of the squeeze-type metering container cap, that is, the flow of the liquid inside is driven by squeezing the container 100 to complete the liquid dispensing. In particular, the solution uses a sleeve 200 and two pistons (first piston 300 and second piston 400) that alternately close the sleeve 200 (or the combination of the sleeve 200 and the opening 120) to ensure the stability of the metering. At any time, at least one of the two pistons is inside the sleeve 200 (or the combination of the sleeve 200 and the orifice 120), and slides and seals with the sleeve 200 (or the combination of the sleeve 200 and the orifice 120). In addition, the liquid seals the gap between the sleeve 200 (or the combination of the sleeve 200 and the orifice 120) and the piston (first piston 300 or 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, it will cause the piston to move outward, accurately sealing the liquid outlet channel 002, realizing quantitative distribution, and the quantitative value remains stable. This solves the problem that the quantitative function of the prior art is affected by the liquid properties and the difference in usage methods. It can adapt to usage scenarios where the viscosity of the liquid changes greatly at different temperatures and the usage methods of different consumers are very different, which makes the prior art difficult to apply.

[0046] After the compression and quantitative distribution are performed and the compression force is removed, the cavity 110 will return to its original state, with increased internal space and decreased air pressure, falling below atmospheric pressure. Under the combined action of atmospheric pressure and the return spring 500, the first piston 300 and the second piston 400 will return to their initial positions, i.e., the first piston 300 will be close to the limiting guide 210 and inside the sleeve 200, while the second piston 400 will be close to the limiting part 311 and outside the sleeve 200. Before the first piston 300 moves into the sleeve 200, external gas rapidly replenishes the sleeve 200 through the liquid outlet channel 002, and replenishes the cavity 110 during the process of the first piston 300 and the second piston 400 returning to their original positions. To prevent the liquid outlet channel 002 from closing too quickly, which would make it difficult for external gas to fill the sleeve 200 and affect the speed at which the cavity 110 returns to its original shape, a return gas gap (not shown) can be provided between the outer wall of the first piston 300 and the inner wall of the sleeve 200. Alternatively, a small return gas hole 320 (such as...) can be provided on the first piston 300. Figures 16-17 Furthermore, a return air port 330 can be configured on the first piston 300, and a one-way valve plate 340 covering the return air port 330 can be configured on the second end face of the first piston 300 (e.g., Figure 18Both the return gas gap and the return gas orifice 320 allow only gas to pass through, but not liquid. The size of the return gas gap and the return gas orifice 320 can be set according to the properties of the liquid contained in the cavity 110. If the liquid has poor fluidity, the return gas gap or the return gas orifice 320 can be appropriately increased to accelerate the return gas speed. If the liquid has good fluidity, the return gas gap or the return gas orifice 320 needs to be appropriately reduced to ensure that the liquid does not easily pass through the return gas gap or the return gas orifice 320. The one-way valve plate 340 is disposed 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 out, the one-way valve plate 340 cannot be opened due to the obstruction of the first piston 300, thus preventing the internal gas and liquid from passing through. When the external gas squeezes the one-way valve plate 340 from the outside in through the return gas orifice 330, the one-way valve plate 340 can be flipped inward without obstruction, thus allowing the external gas to pass through.

[0047] 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 provided between the second end face of the first piston 300 and the outer wall, or a chamfer can be provided between the first end face of the sleeve 200 and the inner wall. Alternatively, chamfers can be provided at both the aforementioned positions of the first piston 300 and the sleeve 200. Figure 4 and Figure 6 Similarly, to improve the smoothness of the process of the second piston 400 moving into the sleeve 200, a chamfer can be provided between the first end face of the second piston 400 and the outer wall, or a chamfer can be provided between the second end face of the sleeve 200 and the inner wall, or chamfers can be provided at both the aforementioned positions of the second piston 400 and the sleeve 200, such as... Figure 2 and Figure 5 .

[0048] Please refer to Figure 4 and Figure 6 The inner wall of the sleeve 200 can be configured with a closing cone surface 220. This closing cone surface 220 is located between and adjacent to the second end of the limiting guide portion 210 and the second end of the sleeve 200. When the second piston 400 is compressed and moves to the vicinity of the limiting guide portion 210, it will abut against the closing cone surface 220, thereby preventing liquid flow. Please refer to [reference needed]. Figure 9 The fitting height L1 of the second piston 400 and the sleeve 200 or the port 120 in sliding sealing is preferably controlled to be above 3mm in order to further improve the stability of metering, especially for liquids with low viscosity.

[0049] Please refer to Figure 3 and Figure 5When the second piston 400 is close to the limiting part 311, the distance between the second piston 400 and the sleeve 200 reaches its maximum. During use, the distance between the second piston 400 and the opening 120 also reaches its maximum when the second piston 400 is close to the limiting part 311. Therefore, the distance between the second piston 400 and the sleeve 200 when the second piston 400 is close to the limiting part 311 is the maximum distance S1 between the second piston 400 and the sleeve 200. The distance between the second piston 400 and the opening 120 during use is the maximum distance S2 between the second piston 400 and the opening 120 during use. The maximum distance S1 between the second piston 400 and the sleeve 200 and the maximum distance S2 between the second piston 400 and the opening 120 during use satisfy: S1≥3mm and S2≥3mm, so that the liquid flows into the sleeve 200 more quickly when inverted.

[0050] Please refer to Figures 7-8 The limiting guide part 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. A gap is left between two adjacent reinforcing ribs to form a through hole 211, and the hole in the guide sleeve forms a first guide hole 212.

[0051] Please refer to Figure 19 A first outer cover 600 is coaxially mounted on the outside of the sleeve 200 and is sealed to the sleeve 200. The first end of the first outer cover 600 faces away from the inside of the container 100, and the second end faces the inside of the container 100, with the first end closed to form a first end portion. The axial distance S3 between the first end portion 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 removed from the sleeve 200, and that a liquid outlet channel 002 is left between the first piston 300 and the sleeve 200 after removal. The first outer cover 600 is provided with a liquid outlet hole 610, which communicates with the liquid outlet channel 002. Therefore, the first outer cover 600 surrounds the first end of the sleeve 200, which can moderate the liquid discharge speed through the liquid outlet 610, and also limit the liquid outlet channel 002 by restricting the stroke of the first piston 300 after it moves out of the sleeve 200, thereby moderating the liquid discharge speed. The size of the liquid outlet channel 002 can be determined according to the properties of the liquid. It can be designed to be larger when the liquid viscosity is high, and smaller when the liquid viscosity is low. It can usually be controlled at about 1~5mm.

[0052] The liquid outlet 610 can be disposed on the side wall of the first outer cover 600 (not shown), or it can be disposed at the first end of the first outer cover 600 (e.g., Figure 19If the outlet hole 610 is located on the side wall of the first outer cover 600, the outlet hole 610 can be positioned directly opposite the outlet channel 002 or offset from the outlet channel 002. If the outlet hole 610 is located on the side wall of the first outer cover 600 offset from the 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: D1 < D2, so that the outlet channel 002 can be extended to the space between the inner wall of the first outer cover 600 and the first piston 300, ensuring that the outlet hole 610 is connected to the outlet channel 002. If the liquid outlet 610 is located at the first end of the first outer cover 600, a protrusion 620 that avoids the liquid outlet 610 needs to be provided between the inner side of the first end of the first outer cover 600 and the first end face of the first piston 300, so as to prevent the first piston 300 from getting close to 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 in communication. Moreover, 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: 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: D2 > D1 > D3, so as to extend the liquid outlet channel 002 to 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 in communication. Specifically, the protrusion 620 can be disposed on the inner side of the first end of the first outer cover 600, or on the first end face of the first piston 300, or both on the inner side of the first end of the first outer cover 600 and on the first end face of the first piston 300.

[0053] Please refer to Figure 3 , Figure 5 and Figure 20 The outer wall of the sleeve 200 may be configured with a support portion 230 and a first sealing portion 240. The support portion 230 is used to abut against the first end face of the opening 120 so that the sleeve 200 can be attached to the opening 120. The first sealing portion 240 is used to seal with the opening 120, thereby achieving a sealed connection between the sleeve 200 and the opening 120. Please refer to [reference needed]. Figures 19-21 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 when in use. The inner wall of the second section of the first outer cover 600 is threaded to the outer wall of the opening 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 section and the second section of the first outer cover 600. The first step is sealed to the support 230, thereby achieving a sealed connection between the first outer cover 600 and the sleeve 200.

[0054] Please refer to Figure 3 and Figure 5 The sleeve 200 can also be configured as a stepped structure, meaning the sleeve 200 includes a first section away from the cavity 110 during use and a second section close to the cavity 110. The diameter of the first section of the sleeve 200 is smaller than the diameter 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 limiting guide portion 210 and the second end of the sleeve 200. Before the first piston 300 moves out of the sleeve 200, it slides and seals with the first section of the sleeve 200. If the second piston 400 moves into the sleeve 200, it slides and seals with the second section of the sleeve 200 after moving in. 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 leaving 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 fit with the opening 120. Please refer to [reference needed]. Figure 19 A second sealing part 630 can be configured on the inner side of the first step. The outer wall of the second sealing part 630 is sealed to the inner wall of the support part 230, thereby achieving a sealed connection between the first outer cover 600 and the sleeve 200.

[0055] Please refer to Figure 22 The second outer cover 700 detachably seals the liquid outlet 610 to prevent dust and other foreign objects from falling in, while also facilitating opening for quantitative dispensing. Specifically, the liquid outlet 610 can be coaxially disposed at the first end of the first outer cover 600, and the second outer cover 700 can be coaxially mounted on the outside of the first outer cover 600, thereby allowing the inner wall of the second outer cover 700 to be threaded into the outer wall of the first outer cover 600 for detachable sealing of the liquid outlet 610. Alternatively, the second outer cover 700 can also detachably seal the liquid outlet 610 in other ways, such as by directly fastening it to the first outer cover 600. The first end of the second outer cover 700 faces away from the interior of the container 100, and the second end faces the interior of the container 100, with the first end closed to form the first end portion. A third sealing part 710 can be disposed on the inner side of the first end portion of the second outer cover 700, and the outer wall of the third sealing part 710 seals against the inner wall of the liquid outlet 610.

[0056] Obviously, the above embodiments of this solution are merely examples for clearly illustrating this solution, and are not intended to limit the implementation of this solution. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this solution should be included within the scope of protection of the claims of this solution.

Claims

1. A squeeze-dispensing cap, used to dispense liquid quantitatively from the container when the container is squeezed, characterized in that, The dispensing cap includes a sleeve, a first piston, a second piston, and a return spring coaxially mounted on the opening during use. The first ends of all three pistons face away from the container interior, and the second ends face the container interior. The sleeve provides a sealing connection to the opening during use. The sleeve contains a limiting guide portion spaced apart from the first end of the sleeve, and the limiting guide portion has a through hole to maintain communication between the first and second ends of the sleeve. The first and second pistons are located on opposite sides of the limiting guide portion. The limiting guide portion has a first guide hole, and the second piston has a second guide hole. The second end face of the first piston has a guide post that slides and seals with both the first and second guide holes. The first end of the guide post is connected to the first piston, and the second end of the guide post has a limiting portion to prevent the second piston from detaching from the guide post. The return spring... A spring is sleeved on the guide post and located between the limiting guide portion and the second piston. The first end of the return spring abuts against the limiting guide portion, and the second end of the return spring abuts against the second piston, so that the first piston is close to the limiting guide portion and is inside the sleeve, while the second piston is close to the limiting portion and is outside the sleeve. When in use, the first piston can be moved out of the sleeve from the first end of the sleeve. Before being moved out, it slides and seals with the sleeve. After being moved out, a liquid outlet channel is left between the first piston and the sleeve. When in use, 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 being moved in, or it can be moved into the opening from outside the opening through the second end of the opening and slides and seals with the opening after being moved in. Before being moved in, a liquid channel is left between the second piston and the sleeve and the container.

2. The compression metering cap according to claim 1, characterized in that, A return air gap is provided between the outer wall of the first piston and the inner wall of the sleeve, making it difficult for liquid to pass through; or the first piston is provided with a small return air hole, making it difficult for liquid to pass through; or the first piston is provided with a return air hole and a one-way valve plate covering the return air hole is provided on the second end face of the first piston.

3. The compression metering cap according to claim 1, characterized in that, The first piston has a chamfer between its second end face and the outer wall, and / or the sleeve has a chamfer between its first end face and the inner wall; the second piston has a chamfer between its first end face and the outer wall, and / or the sleeve has a chamfer between its second end face and the inner wall.

4. The compression dispensing cap 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 and the second end of the sleeve and adjacent to the limiting guide.

5. The compression metering cap according to claim 1, characterized in that, The sliding seal fit height L1 between the second piston and the sleeve / mouth satisfies: L1≥3mm.

6. The compression dispensing cap according to claim 1, characterized in that, The maximum distance S1 between the second piston and the sleeve, and the maximum distance S2 between the second piston and the opening during use, satisfy: S1≥3mm and S2≥3mm.

7. The compression metering cap according to any one of claims 1 to 6, characterized in that, The extrusion metering cap further includes a first outer cap, which is coaxially mounted on the outside of the sleeve and sealed to the sleeve. In use, the first end of the first outer cap faces away from the inside of the container and the second end faces the inside of the container. The first end of the first outer cap is provided with a liquid outlet hole. The inner side of the first end of the first outer cap and / or the first end face of the first piston are provided with a protrusion that avoids the liquid outlet hole, so that the liquid outlet hole and the inner cavity of the first outer cap are always in communication. The outer diameter D1 of the first piston, the inner diameter D2 of the first outer cap, and the inner diameter D3 of the liquid outlet hole satisfy the following relationship: D2 > D1 > D3. The axial distance S3 between the first end of the first outer cap and the sleeve, the thickness L2 of the first piston, and the height L3 of the protrusion satisfy the following relationship: S3 > L2 + L3.

8. The compression metering cap according to claim 7, characterized in that, The outer wall of the sleeve is provided with a support portion and a first sealing portion. The support portion is used to abut against the first end face of the opening, and the first sealing portion is used to seal with the opening. The first outer cover includes a first section away from the container cavity and a second section close to the container cavity when in use. The inner wall of the second section of the first outer cover is used to thread with the outer wall of the opening. 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. A first step is formed between the first section and the second section of the first outer cover. The first step seals with the support portion.

9. The extrusion metering cap according to claim 8, characterized in that, The sleeve includes a first section away from the container cavity and a second section close to the container cavity during use. 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 and second sections of the sleeve, located between the first end of the limiting guide and the second end of the sleeve. The second section of the sleeve extends the support portion outside the second step. A deformation space is left between the support portion and the first section of the sleeve. The first sealing portion is disposed on the outer wall of the support portion. A second sealing portion is provided on the inner side of the first step. The outer wall of the second sealing portion is sealed to the inner wall of the support portion.

10. The compression metering cap according to claim 7, characterized in that, The squeeze metering cap also includes a second outer cap, which detachably seals the liquid outlet.

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