Quantitative pump and container

Abstract

The utility model relates to packing technical field discloses a kind of quantitative pump and container. Quantitative pump includes support assembly, piston assembly, first plugging assembly, second plugging assembly and end cover, installation cavity is set on support assembly, piston assembly is movably installed in installation cavity, and with support assembly, the pump cavity with feed hole and discharge passage is enclosed, first plugging assembly is used to open and close feed hole, second plugging assembly is used to open and close discharge passage, and discharge passage is opened when pressure increases in pump cavity;End cover is connected with the inner wall of installation cavity, piston assembly includes piston head, piston rod and operating part, piston head is located in end cover inside, piston rod one end is connected with piston head, other end passes end cover and is connected with operating part, end cover axial position-limiting piston head, operating part and end cover form stroke gap, the position of operating part relative to piston rod is adjustable. The quantitative pump, the stroke of piston assembly can be flexibly adjusted, and then the material pump-out quantity of single press piston assembly is flexibly adjusted.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and in particular to a metering pump and container. Background Technology

[0002] Containers used to hold condiments typically consist of a container body and a pump body. The container body holds the material, and the pump body is installed at the outlet of the container body to pump the material out. To achieve metered dispensing of the material, some containers use a push-type metering pump.

[0003] In related technologies, a push-button metering pump includes a pump body, a first sealing assembly, a second sealing assembly, and a piston assembly. The pump body contains a pump chamber, with an inlet for communication with the container body and an outlet for discharging material on its side wall. The piston assembly is movably connected to the pump body and is pressed by the user to change the volume of the pump chamber. The first sealing assembly opens and closes the inlet, and the second sealing assembly opens and closes the outlet. When the user presses the piston assembly, the pump chamber volume decreases, the first sealing assembly opens the outlet, and the second sealing assembly keeps the inlet closed, allowing material to be discharged from the pump chamber through the outlet. Since the piston assembly stroke is fixed, the amount of material discharged per press is fixed. During the piston assembly's return stroke, the pump chamber volume increases, the first sealing assembly closes the outlet, and the second sealing assembly opens the inlet, allowing material from the container body to enter the pump chamber.

[0004] However, in the aforementioned push-type metering pump, the stroke of the piston assembly is fixed, so the volume change of the pump chamber is also fixed when the piston assembly is pressed each time. This means that the amount of material discharged each time the moving assembly is pressed is also fixed. Users cannot adjust the discharge volume according to actual usage needs, making it difficult for the metering pump to meet variable discharge requirements, resulting in a poor user experience. Utility Model Content

[0005] The purpose of this invention is to provide a metering pump that allows for flexible adjustment of the piston assembly stroke, thereby flexibly adjusting the material pumping rate per press of the piston assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A metering pump includes a support assembly, a piston assembly, a first sealing assembly, a second sealing assembly, and an end cap. The support assembly and the piston assembly enclose a pump chamber. The piston assembly is used to change the volume of the pump chamber. The pump chamber has an inlet and an outlet channel. The first sealing assembly is used to block the inlet and open the inlet when the pressure in the pump chamber decreases. The second sealing assembly is used to block the outlet channel and open the outlet channel when the pressure in the pump chamber increases.

[0008] The support assembly has a mounting cavity, and the end cap is connected to the inner wall of the mounting cavity. The piston assembly includes a piston head, a piston rod, and an operating member. The piston head is located inside the end cap and slides in cooperation with the inner wall of the mounting cavity. One end of the piston rod is connected to the piston head, and the other end extends outside the end cap and is connected to the operating member. The end cap axially limits the piston head, and a stroke clearance is formed between the operating member and the end cap. The position of the operating member relative to the piston rod is adjustable along the movement direction of the piston head.

[0009] As an optional solution, the operating component slides in conjunction with the support assembly. The piston assembly further includes an adjusting component, which is sleeved on the piston rod. The operating component is sleeved outside the adjusting component. The inner circumferential surface of the adjusting component is provided with a first threaded portion, and the outer circumferential surface is provided with a second threaded portion. The first threaded portion is threadedly connected to the piston rod, and the second threaded portion is threadedly engaged with the operating component. The first threaded portion and the second threaded portion have opposite rotation directions.

[0010] As an alternative, one of the operating element and the adjusting element is provided with a dial, and the other is provided with an indicator, the indicator being used to cooperate with the dial to indicate the amount of material discharged during a single press of the operating element; and / or

[0011] The adjusting component has a mating groove on its end face, which is used to match with an external tool.

[0012] As an alternative, the operating element is rotatable relative to the support assembly and is threadedly connected to the piston rod.

[0013] As an alternative, the metering pump further includes a resilient reset member connected between the end cap and the operating member, the resilient reset member being configured to position the piston assembly in an initial position, in which the piston head abuts against the end cap.

[0014] As an optional solution, the end cap has a first positioning guide groove on the side facing the operating member, and one end of the elastic reset member is installed in the first positioning guide groove; and / or

[0015] The operating component is provided with a second positioning guide groove on the side facing the end cover, and the other end of the elastic reset component is installed in the second positioning guide groove.

[0016] As an optional solution, the end cap is sealed to the inner wall of the mounting cavity, and a buffer cavity is formed between the side of the piston head facing the piston rod and the end cap. The support assembly is also provided with a buffer hole, one end of which communicates with the buffer cavity and the other end of which communicates with the inner cavity of the outer container body.

[0017] As an optional embodiment, the first sealing assembly includes a first elastic element and a first sealing element. The first sealing element is slidably engaged with the support assembly and is disposed opposite to the feed hole. The first elastic element connects the support assembly and the first sealing element, and the first elastic element is configured to press against the first sealing element to block the feed hole; and / or

[0018] The second sealing assembly includes a second sealing element and a second elastic element. The second sealing element is disposed in the discharge channel, and the second elastic element connects the support assembly and the second sealing element. The second elastic element is configured to press against the second sealing element to block the entrance of the discharge channel.

[0019] As an optional solution, the support component is provided with an installation port, which is configured to connect to the container body. A guide ramp is provided between the installation port and the inlet of the feed hole, and the guide ramp is configured to guide the material into the feed hole.

[0020] Another objective of this invention is to provide a container that, by employing the aforementioned metering pump, allows for flexible adjustment of the material pumping rate of a single press of the piston assembly, resulting in a better user experience.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A container includes a container body and a metering pump, the metering pump being installed at an opening in the container body, and the feed port communicating with the inner cavity of the container body.

[0023] The beneficial effects of this utility model are:

[0024] This utility model discloses a metering pump, comprising a support assembly, a piston assembly, a first sealing assembly, a second sealing assembly, and an end cap. The support assembly and piston assembly enclose a pump chamber for buffering material. The first and second sealing assemblies are used to seal the inlet and outlet channels, respectively. The end cap is connected to the inner wall of the mounting cavity and axially limits the piston head. A stroke clearance is formed between the operating component and the end cap. When the operating component is pressed, the piston head slides along the inner wall of the mounting cavity, reducing the volume of the pump chamber and increasing the pressure inside the pump chamber. This forces the second sealing assembly to open the outlet channel to discharge the material from the pump chamber. During this process, the first sealing assembly keeps the inlet sealed, and the material discharged per press of the operating component is fixed when the stroke clearance between the operating component and the end cap remains unchanged. When the piston assembly returns, the volume of the pump chamber increases, the pressure inside the pump chamber decreases, the second sealing assembly closes the outlet channel, and the first sealing assembly opens the inlet, thereby replenishing the pump chamber with material for the next pumping operation. Because the position of the operating component relative to the piston rod is adjustable, the distance between the operating component and the end cover along the movement direction of the piston assembly is also adjustable. This allows for adjustment of the stroke clearance. Therefore, the stroke of the piston assembly is adjustable during a single press, and correspondingly, the volume change of the pump chamber is adjustable. This allows for flexible adjustment of the material pumping rate of the piston assembly per press, meeting the user's needs for varying the discharge rate per press, resulting in a better user experience.

[0025] The container of this invention, by employing the aforementioned metering pump, allows for flexible adjustment of the material pumping volume of a single press of the piston assembly, resulting in a superior user experience. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the container provided in a specific embodiment of this utility model;

[0027] Figure 2 This is an exploded view of the container provided in a specific embodiment of this utility model;

[0028] Figure 3 This is a cross-sectional view of the container at the metering pump provided in a specific embodiment of this utility model;

[0029] Figure 4 This is an exploded view of the metering pump provided in a specific embodiment of this utility model;

[0030] Figure 5 This is a partial structural schematic diagram of the metering pump provided in a specific embodiment of this utility model.

[0031] In the picture:

[0032] 100. Metering pump; 200. Sealing gasket; 300. Container body; 310. Annular settling tank;

[0033] 10. Support components;

[0034] 1. Pump body; 11. Mounting cavity; 12. Feed port; 121. First conical surface; 13. Mounting hole; 14. Buffer hole; 15. Mounting port; 16. Guide slope;

[0035] 2. Piston assembly; 211. Piston head; 212. Piston rod; 23. Operating component; 231. Second positioning guide groove; 24. Adjusting component; 241. Mating groove;

[0036] 31. Valve core body; 311. Discharge channel; 312. Slide rail; 314. First connecting channel; 3141. Third conical surface; 315. Second connecting channel; 316. Mounting part; 317. Through part; 318. Operating part; 319. Limiting part;

[0037] 32. First sealing assembly; 321. First sealing element; 3211. Second conical surface; 322. First elastic element;

[0038] 33. Second sealing assembly; 331. Second sealing element; 332. Second elastic element;

[0039] 34. Installation components;

[0040] 4. End cap; 411. First positioning guide groove;

[0041] 5. Elastic reset component;

[0042] 61. Pump chamber; 62. Buffer chamber;

[0043] 71. First sealing ring; 72. Second sealing ring; 73. Third sealing ring. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] This embodiment provides a metering pump and a container. For example... Figure 1 and Figure 2 As shown, the container includes a container body 300 and a metering pump 100. The container body 300 is used to contain liquid materials, such as seasonings or cosmetics. The container body 300 has an opening for filling the container body 300 with materials. In this embodiment, the opening of the container body 300 is located at one end of the container body 300 and covers the entire end face, thereby ensuring that the opening is large enough to facilitate filling the container body 300 with materials. The metering pump 100 is installed at the opening of the container body 300, sealing the opening of the container body 300 and connecting the metering pump 100 to the container body 300.

[0049] Optionally, the container body 300 and the metering pump 100 are connected by threads, which not only facilitates disassembly and assembly but also provides a good seal. Figure 2 and Figure 3As shown, the container body 300 has an annular groove 310 on the outer periphery of one end with an opening. An external thread is provided on the side wall of the annular groove 310. The metering pump 100 includes an installation port 15, which is annular and has an internal thread. The installation port 15 is fitted into the annular groove 310, and the internal thread and external thread are threadedly connected. In other embodiments, the container body 300 and the metering pump 100 can also be connected by a snap-fit ​​connection, which is not specifically limited here. Optionally, the container also includes a sealing gasket 200, which is sandwiched between the metering pump 100 and the container body 300, thereby further improving the container's sealing performance. Optionally, the sealing gasket 200 can be a rubber sealing ring.

[0050] like Figure 1 As shown, in this embodiment, the metering pump 100 is a press-type metering pump 100. When the user presses the operating part 23 of the metering pump 100 once, the metering pump 100 can pump out a metered amount of material so that the user can achieve accurate material dispensing.

[0051] like Figure 3 As shown, the metering pump 100 includes a support assembly 10, a piston assembly 2, a first sealing assembly 32, and a second sealing assembly 33. The support assembly 10 and the piston assembly 2 together form a pump chamber 61. The piston assembly 2 is movably connected to the support assembly 10 and is used to change the volume of the pump chamber 61. The pump chamber 61 has an inlet port 12 and an outlet channel 311. The inlet port 12 communicates with the interior of the container body 300, allowing material from the container body 300 to enter the pump chamber 61. The pump chamber 61 buffers the material, and the outlet channel 311 discharges the material from the pump chamber 61. Specifically, the support assembly 10 has an open mounting cavity 11. The piston assembly 2 is installed into the mounting cavity 11 through the opening and slides against the inner wall of the mounting cavity 11 to adjust the volume of the pump chamber 61. The piston assembly 2 extends at least partially outside the support assembly 10 for user pressing operation. The first sealing assembly 32 is used to seal the feed inlet 12. When the piston assembly 2 increases the volume of the pump chamber 61 and decreases the pressure inside the pump chamber 61, the first sealing assembly 32 opens the feed inlet 12. The second sealing assembly 33 is used to seal the discharge channel 311. When the piston assembly 2 decreases the volume of the pump chamber 61 and increases the pressure inside the pump chamber 61, the second sealing assembly 33 opens the discharge channel 311.

[0052] The general working principle of the metering pump is as follows: When the piston assembly 2 is not pressed, the pump chamber 61 contains material. The first sealing assembly 32 blocks the feed hole 12, and the second sealing assembly 33 blocks the discharge channel 311. When the piston assembly 2 is pressed, the volume of the pump chamber 61 decreases, and the pressure inside the pump chamber 61 increases, forcing the second sealing assembly 33 to open the discharge channel 311. The material in the pump chamber 61 is discharged from the discharge channel 311. Since the stroke of the piston assembly 2 is fixed, the amount of material discharged by pressing the piston assembly 2 once is fixed. When the piston assembly 2 returns, the volume of the pump chamber 61 increases, and the second sealing assembly 33 closes the discharge channel 311. Under the suction effect of the negative pressure inside the pump chamber 61 (it should be noted that the suction effect refers to the effect caused by the pressure inside the container body 300 being greater than the pressure inside the pump chamber 61), the first sealing assembly 32 opens the feed hole 12, allowing the material inside the container body 300 to be replenished into the pump chamber 61 so that it can be discharged the next time the piston assembly 2 is pressed.

[0053] like Figure 3 and Figure 4 As shown, the metering pump 100 also includes an end cap 4, which is connected to the inner wall of the opening end of the mounting cavity 11. The piston assembly 2 includes a piston head 211, a piston rod 212, and an operating member 23. The piston head 211 is located inside the end cap 4 (i.e., the side facing the inside of the mounting cavity 11) and is slidably engaged with the inner wall of the mounting cavity 11. One end of the piston rod 212 is connected to the piston head 211, and the other end extends through to the outside of the end cap 4. The end cap 4 is configured to axially limit the piston head 211. The operating member 23 is connected to the end of the piston rod 212 located outside the end cap 4 (i.e., the side facing the outside of the mounting cavity 11). A stroke clearance H is formed between the operating member 23 and the end cap 4, which is the stroke of the piston assembly 2.

[0054] In this embodiment, as Figure 3 As shown, the piston head 211 slides in cooperation with the inner wall of the mounting cavity 11 along the second direction. The operating member 23 has an approximately rectangular structure and slides in cooperation with the mounting cavity 11 along the second direction. That is, the operating member 23 cannot rotate relative to the pump body 1. This arrangement can prevent the piston assembly 2 connected to the operating member 23 from rotating arbitrarily.

[0055] like Figure 3 and Figure 4As shown, the metering pump 100 also includes an elastic reset member 5. The elastic reset member 5 connects the end cap 4 and the operating member 23. The elastic reset member 5 is used to reset the piston head 211 to its initial position. In the initial position, the piston head 211 abuts against the end cap 4. That is, after the user presses the operating member 23, the elastic reset member 5 drives the piston assembly 2 to reset as a whole. Optionally, the elastic reset member 5 can be a spring. The end cap 4 is provided with a first positioning guide groove 411 on the side facing the operating member 23, and the operating member 23 is provided with a second positioning guide groove 231 on the side facing the end cap 4. The openings of the first positioning guide groove 411 and the second positioning guide groove 231 are directly opposite each other. One end of the elastic reset member 5 is installed in the first positioning guide groove 411, and the other end is installed in the second positioning guide groove 231. Through the cooperation of the first positioning guide groove 411 and the second positioning guide groove 231, the installation of the elastic reset member 5 can be positioned, and the elastic deformation of the elastic reset member 5 can be guided, thereby ensuring the accuracy of the piston assembly 2's stroke. Optionally, both the first positioning guide groove 411 and the second positioning guide groove 231 are annular grooves and are arranged around the outer periphery of the piston rod 212.

[0056] In related technologies, the piston assembly has a fixed stroke, and the amount of material discharged per press is fixed, which cannot be flexibly adjusted according to the user's actual needs, resulting in a poor user experience.

[0057] In this embodiment, the position of the operating member 23 relative to the end cover 4 is adjustable along the movement direction of the piston assembly 2, so that the stroke clearance H is adjustable, that is, the stroke of the piston assembly 2 is adjustable. By adjusting the stroke of the piston assembly 2, the amount of material discharged when the operating member 23 is pressed once can be adjusted, thereby improving the flexibility of the metering pump 100 and improving the user experience.

[0058] Optionally, in this embodiment, to adjust the stroke clearance, the piston assembly 2 further includes an adjusting member 24. The adjusting member 24 is an annular structure and is sleeved on the piston rod 212. The operating member 23 is sleeved on the outside of the adjusting member 24. The inner circumferential surface of the adjusting member 24 is provided with a first threaded portion, and the outer circumferential surface is provided with a second threaded portion. The first threaded portion is threadedly connected to the piston rod 212, and the second threaded portion is threadedly engaged with the operating member 23. The first threaded portion and the second threaded portion have opposite rotation directions. Since the piston head 211 is kept in abutting position against the end cover 4 under the action of the elastic reset member 5, when the adjusting member 24 is rotated, the adjusting member 24 moves axially along the piston rod 212, while the operating member 23 moves axially along the adjusting member 24. The movement direction of the operating member 23 relative to the adjusting member 24 is the same as the movement direction of the adjusting member 24 relative to the piston rod 212. Thus, the distance between the operating member 23 and the end cover 4 can be adjusted, that is, the size of the stroke clearance H can be adjusted. In addition, by setting the adjustment member 24, it can be ensured that the operating member 23 does not rotate during the adjustment of the stroke clearance, thereby ensuring that the elastic reset member 5 connected to the operating member 23 will not rotate, thus ensuring the service life of the elastic reset member 5.

[0059] In some embodiments (not shown), the operating member 23 can rotate relative to the pump body 1 about the axis of the piston rod 212. In this case, the operating member 23 can be directly set to be threadedly connected to the piston rod 212, so that the stroke clearance H can also be adjusted.

[0060] Optionally, the operating member 23 is provided with a dial, and the adjusting member 24 is provided with an indicator. The indicator is used to cooperate with the dial to indicate the amount of material discharged when the operating member 23 is pressed once. This allows the user to clearly and conveniently adjust the amount of material discharged per press. In other embodiments, the indicator can be located on the operating member 23, and the dial can be located on the adjusting member 24.

[0061] like Figure 4 As shown, a mating groove 241 is provided on the end face of the adjusting member 24, which is used to match with an external tool. Therefore, the user can rotate the adjusting member 24 with the aid of a tool, improving the convenience of adjusting the stroke clearance. Optionally, the mating groove 241 can be a groove that mates with a flathead wrench or a cross-head wrench; this is not limited here. In some embodiments, the mating groove 241 can also serve as an indicator of the amount of material discharged.

[0062] like Figure 3 As shown, to ensure the sealing of the pump chamber 61, the piston head 211 is fitted with the inner wall of the mounting cavity 11 with a clearance, thereby ensuring both smooth reciprocating sliding of the piston assembly 2 and the sealing of the pump chamber 61. Figure 3 and Figure 4As shown, the metering pump 100 also includes a first sealing ring 71, which is sleeved on the circumferential surface of the piston head 211. The first sealing ring 71 is used to slide and seal the piston head 211 against the inner wall of the mounting cavity 11, thereby further improving the sealing performance of the pump cavity 61. Optionally, the first sealing ring 71 can be an O-ring, and one O-ring is provided. In some embodiments, the first sealing ring 71 is not provided, but the piston head 211 is set as a rubber-coated structure, that is, the inside of the piston head 211 is made of rigid material, and the outer layer is covered with a flexible material. The flexible material cooperates with the inner wall of the mounting cavity 11 to ensure the sealing effect. Optionally, the flexible material can be TPV material or PTV material, etc., and the thickness of the flexible material is 2~5mm.

[0063] During prolonged use of the metering pump, the pressure inside the pump chamber 61 is relatively high when the piston assembly 2 is pressed. If the side of the piston head 211 facing the piston rod 212 is directly connected to the outside atmosphere, a small amount of material will seep out from between the piston head 211 and the inner wall of the mounting chamber 11 into the outside of the metering pump during prolonged use, resulting in a poor user experience.

[0064] In this regard, such as Figure 3 As shown, the end cap 4 is sealed to the inner wall of the mounting cavity 11, and a buffer cavity 62 is formed between it and the piston head 211. That is, the two sides of the piston head 211 are the pump cavity 61 and the buffer cavity 62, respectively. A buffer hole 14 is provided on the pump body 1. The first end of the buffer hole 14 communicates with the interior of the container body 300, and the second end of the buffer hole 14 communicates with the buffer cavity 62. During the pressing of the operating member 23, as the piston head 211 compresses the volume of the pump cavity 61, the volume of the buffer cavity 62 increases and the air pressure decreases. Material inside the container body 300 can enter the buffer cavity 62 through the buffer hole 14, thereby reducing the pressure difference on both sides of the piston head 211 and making the piston assembly 2 easier to press. During the return stroke of the piston assembly 2, the volume of the buffer cavity 62 is compressed, and the material inside flows back into the container body 300 from the buffer hole 14. In other words, there will be no high pressure in the buffer chamber 62 throughout the process. Therefore, even if a small amount of material leaks into the buffer chamber 62 from between the piston head 211 and the inner wall of the mounting chamber 11 due to the high pressure in the pump chamber 61, the pressure in the buffer chamber 62 will never be very high, so it will not leak from between the end cover 4 and the side wall of the buffer chamber 62 to the outside of the metering pump, resulting in a good user experience.

[0065] like Figure 3As shown, the piston head 211 includes a main body 2111 and a stepped portion 2112. The main body 2111 slides against the inner wall of the mounting cavity 11. The stepped portion 2112 is connected to the end of the main body 2111 facing the end cap 4 and is used to abut against the end cap 4. The cross-sectional area of ​​the stepped portion 2112 is smaller than the cross-sectional area of ​​the main body 2111, so that a buffer cavity 62 is formed between the main body 2111 and the end cap 4. This arrangement ensures both the axial limiting effect of the end cap 4 on the piston head 211 and the constant presence of the buffer cavity 62 between the piston head 211 and the end cap 4.

[0066] In this embodiment, the piston rod 212 and the end cap 4 can be a clearance / transition fit, thereby improving the sealing performance of the buffer cavity 62 while ensuring that the piston rod 212 can move smoothly relative to the end cap 4. Figure 3 and Figure 4 As shown, the metering pump 100 further includes a second sealing ring 72, which is sleeved on the circumferential surface of the piston rod 212 and sandwiched between the piston rod 212 and the end cap 4. The second sealing ring 72 is used to slide and seal the contact surface between the piston rod 212 and the end cap 4. The second sealing ring 72 can be an O-ring, and 2 to 3 O-rings are provided. Optionally, the end cap 4 and the inner wall of the mounting cavity 11 are transitionally fitted to ensure the sealing performance of the mating position, thereby ensuring the reliability of the sealing of the buffer cavity 62. In this embodiment, the metering pump 100 further includes a third sealing ring 73, which is sleeved on the circumferential surface of the end cap 4 and sandwiched between the end cap 4 and the inner wall of the mounting cavity 11. The third sealing ring 73 is used to seal the end cap 4 and the inner wall of the mounting cavity 11. The third sealing ring 73 can be an O-ring, and 1 to 2 O-rings are provided.

[0067] like Figure 1 and Figure 3 As shown, the support assembly 10 includes a pump body 1 and a valve core body 31. A mounting cavity 11 is formed on the pump body 1, and a feed inlet 12 is formed on the pump body 1 and communicates with the mounting cavity 11. A mounting hole 13 is also formed on the pump body 1. The valve core body 31 is mounted at the mounting hole 13 and partially extends into the mounting cavity 11. A discharge channel 311 is formed on the valve core body 31. The mounting port 15 is part of the pump body 1 and is arranged around the feed inlet 12, ensuring that the feed inlet 12 communicates with the interior of the container body 300 after the metering pump 100 is installed on the container body 300. In this embodiment, a guide slope 16 is provided between the mounting port 15 and the inlet of the feed inlet 12. The guide slope 16 guides the material to flow into the feed inlet 12. By providing the guide slope 16, when the metering pump 100 is used inverted (i.e., in the posture shown in the figure), it can be ensured that all material in the container body 300 flows smoothly into the feed inlet 12, avoiding material residue in the container body 300.

[0068] Optionally, such as Figure 3 and Figure 5 As shown, the first sealing component 32 and the second sealing component 33 are both installed on the valve core body 31. These three components can form an integral module installed at the mounting hole 13, facilitating overall disassembly and assembly from the pump body 1 and improving the ease of cleaning the inside of the pump chamber 61. In this embodiment, the mounting hole 13 and the feed hole 12 are arranged opposite each other along a first direction. The first sealing component 32 is installed at one end of the valve core body 31 along the first direction and is arranged opposite to the feed hole 12, thus enabling the opening and closing of the feed hole 12. The second sealing component 33 is installed in the discharge channel 311 to facilitate the opening and closing of the discharge channel 311. The opening of the mounting cavity 11 is located at one end of the mounting cavity 11 along a second direction, meaning the piston assembly 2 is installed into the mounting cavity 11 along the second direction. In this embodiment, the first direction is perpendicular to the second direction.

[0069] Optionally, such as Figure 3 As shown, the valve core body 31 is threaded to the side wall of the mounting hole 13. This threaded connection is not only convenient to operate but also ensures good sealing of the pump chamber 61. In other embodiments (not shown), the valve core body 31 is snap-fitted to the side wall of the mounting hole 13. In this embodiment, a sealing element can be fitted around the circumference of the valve core body 31 to ensure the sealing of the pump chamber 61.

[0070] like Figure 3 and Figure 5 As shown, along the first direction, the valve core body 31 includes a mounting portion 316 and a through portion 317. The outer periphery of the mounting portion 316 is threadedly connected to the inner wall of the mounting hole 13. The through portion 317 is connected to the mounting portion 316 and extends into the pump chamber 61. The through portion 317 supports the first sealing assembly 32, ensuring that the first sealing assembly 32 can reliably seal the feed hole 12. It can be understood that the projection of the through portion 317 along the first direction falls within the projection range of the mounting portion 316 in the first direction, thereby ensuring that the through portion 317 can be smoothly inserted into the pump chamber 61 from the mounting hole 13. Figure 5 As shown, the valve core body 31 also includes a limiting part 319, which is connected to the end of the mounting part 316 opposite to the through part 317. The projection of the limiting part 319 along the first direction is at least partially outside the projection range of the mounting part 316 along the first direction. The limiting part 319 is used to abut against the outer end face of the pump body 1, thereby limiting the installation of the valve core body 31, ensuring the accurate installation position of the valve core body 31, and thus ensuring that the first sealing component 32 installed on the valve core body 31 can reliably seal the feed hole 12. The valve core body 31 also includes an operating part 318, which is connected to the limiting part 319 and located outside the pump body 1. The operating part 318 is used for user operation, thereby further improving the convenience of disassembling and assembling the valve core body 31. Optionally, the operating part 318 is constructed in the shape of a hexagonal nut, so the valve core body 31 can be turned with a wrench, further improving the convenience of disassembling and assembling the valve core body 31.

[0071] like Figure 3 As shown, a slide 312 is provided on the valve core body 31, and the slide 312 is located at the end of the valve core body 31 along the first direction. The first sealing assembly 32 includes a first sealing member 321 and a first elastic member 322. The first sealing member 321 is slidably engaged with the slide 312 and is opposite to the feed hole 12. The first elastic member 322 connects the valve core body 31 and the first sealing member 321, and can press the first sealing member 321 against the feed hole 12. When the first elastic member 322 is in the initial state (the first elastic member 322 is in a slightly compressed state in the initial state), the first elastic member 322 can make the first sealing member 321 tightly press against the end of the feed hole 12 to seal the feed hole 12. When the piston assembly 2 returns, the volume of the pump chamber 61 increases, the pressure inside the pump chamber 61 decreases, and a pressure difference is generated between the container body 300 and the pump chamber 61. The material inside the container body 300 will squeeze the first sealing member 321. The first sealing member 321 overcomes the elastic force of the first elastic member 322 and slides along the slide 312, thereby opening the feed hole 12.

[0072] Optionally, such as Figure 3 As shown, the inner wall of the end of the feed hole 12 facing the pump chamber 61 is constructed as a first conical surface 121, and the cross-section of the first conical surface 121 gradually increases along the flow direction of the material. The first sealing member 321 includes a second conical surface 3211, which is used to abut against the first conical surface 121. Through the cooperation of the first conical surface 121 and the second conical surface 3211, the reliability of the sealing of the feed hole 12 by the first sealing member 321 can be improved.

[0073] In this embodiment, the slide 312 extends along a first direction, and the longitudinal section of the first sealing member 321 is approximately T-shaped, with the thinner end inserted into the slide 312 and the thicker end located outside the valve core body 31 and used to seal the feed hole 12. The first elastic member 322 is constructed as a columnar structure and is disposed within the slide 312. One end of the first elastic member 322 is fixedly connected to the first sealing member 321, and the other end is connected to the bottom of the slide 312. Optionally, a slot is provided at the end of the first sealing member 321 facing the inside of the slide 312, and the first elastic member 322 is inserted into the slot. In some embodiments, the first elastic member 322 is made of TPV material. The first elastic member 322 made of TPV material can ensure sufficient elasticity and is more resistant to corrosion by acidic or alkaline materials than springs made of metal materials, thereby improving the service life of the metering pump 100. Optionally, the first elastic element 322 can be manufactured using injection molding or by vulcanizing a honeycomb structure with fluororubber, thus achieving better economic efficiency while ensuring elasticity. Specifically, the wall thickness of the hexagons in the honeycomb structure is 0.5mm~1mm, and the inscribed circle of the hexagon is 2mm~5mm. In other embodiments, the first elastic material can also be made of TPU.

[0074] like Figure 3 and Figure 4 As shown, the valve core body 31 is also provided with a first connecting channel 314. The first end of the first connecting channel 314 is connected to the pump chamber 61, and the second end is connected to the discharge channel 311. The second sealing assembly 33 includes a second sealing element 331 and a second elastic element 332. The second sealing element 331 is disposed in the discharge channel 311, and the second elastic element 332 connects the valve core body 31 and the second sealing element 331. The second elastic element 332 can press the second sealing element 331 against the second end of the first connecting channel 314 to seal the discharge channel 311. When the second elastic element 332 is in the initial state (the second elastic element 332 is in a slightly compressed state in the initial state), the second elastic element 332 can make the second sealing element 331 tightly press against the end of the first connecting channel 314, thereby sealing the discharge channel 311. When the piston assembly 2 is pressed, reducing the volume of the pump chamber 61, the pressure inside the pump chamber 61 increases. The material inside the pump chamber 61 compresses the second sealing member 331, causing the second sealing member 331 to overcome the force of the second elastic member 332 and move away from the first connecting channel 314, thereby opening the discharge channel 311. When the piston assembly 2 returns, the volume of the pump chamber 61 increases, the pressure inside the pump chamber 61 decreases, and the second elastic member 332 drives the second sealing member 331 to reset to its initial state, re-sealing the discharge channel 311.

[0075] like Figure 3 As shown, both the discharge channel 311 and the first connecting channel 314 extend along the first direction. One end of the discharge channel 311 extends through to the end face of the valve core body 31 to communicate with the outside of the pump body 1. Figure 3 and Figure 4 As shown, the valve core body 31 is also provided with a plurality of second connecting channels 315. The plurality of second connecting channels 315 are arranged around the circumference of the valve core body 31. One end of each second connecting channel 315 is connected to the pump chamber 61, and the other end is connected to the first connecting channel 314. By setting the second connecting channels 315, it is easy to realize the connection between the pump chamber 61 and the first connecting channel 314, reducing the processing difficulty. The setting of multiple second connecting channels 315 can also make the material in the pump chamber 61 enter the valve core body 31 evenly from the circumference, thereby evenly pushing the second sealing member 331.

[0076] like Figure 3 As shown, the inner surface of the first connecting channel 314 includes a third conical surface 3141. Along the material discharge direction, the cross-section of the third conical surface 3141 gradually increases. The second sealing member 331 includes a spherical or conical surface, which abuts against the third conical surface 3141. Through the cooperation of the third conical surface 3141 with the conical surface, or the cooperation of the third conical surface 3141 with the spherical surface, the reliability of the second sealing assembly 33's seal on the discharge channel 311 can be guaranteed. In this embodiment, the second sealing member 331 is constructed as a sphere.

[0077] To achieve the connection between the second sealing assembly 33 and the valve core body 31, such as Figure 3 and Figure 4 As shown, the metering pump 100 also includes a mounting component 34, which is detachably connected to the inner wall of the discharge channel 311. The two ends of the second elastic member 332 are respectively connected to the second sealing member 331 and the mounting component 34. The mounting component 34 has a through hole to allow the discharge channel 311 to pass through. Optionally, the mounting component 34 can be a hollow cross-head nut, which is threaded to the inner wall of the discharge channel 311, facilitating assembly and disassembly and ensuring smooth discharge from the discharge channel 311.

[0078] In summary, the working principle of the metering pump 100 in this embodiment is roughly as follows:

[0079] By rotating the adjusting member 24, the indicator on the adjusting member 24 is aligned with a certain scale on the dial of the operating member 23 (the user can select different scales according to their needs), thereby confirming the amount of material discharged by a single press of the operating member 23.

[0080] Press the operating member 23 along the second direction until the operating member 23 abuts against the end cap 4. During this process, the piston assembly 2 compresses the volume of the pump chamber 61, and the material in the pump chamber 61 pushes the second sealing member 331 to open the discharge channel 311, and the material is discharged quantitatively from the discharge channel 311.

[0081] When the pressing operation 23 is completed, the elastic reset member 5 drives the piston assembly 2 to reset, the pressure in the pump chamber 61 decreases, the second elastic member 332 drives the second sealing member 331 to re-seal the discharge channel 311, the first sealing member 321 overcomes the force of the first elastic member 322 and opens the feed hole 12, the material in the container body 300 is filled into the pump chamber 61 from the feed hole 12, when the pressure in the pump chamber 61 is balanced, the first elastic member 322 drives the first sealing member 321 to re-seal the feed hole 12.

[0082] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, based on the concept of this utility model, there will be changes in the specific implementation methods and application scope. The content of this specification should not be construed as a limitation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A metering pump, characterized in that, The pump includes a support assembly (10), a piston assembly (2), a first sealing assembly (32), a second sealing assembly (33), and an end cap (4). The support assembly (10) and the piston assembly (2) form a pump chamber (61). The piston assembly (2) is used to change the volume of the pump chamber (61). The pump chamber (61) has a feed inlet (12) and a discharge channel (311). The first sealing assembly (32) is used to block the feed inlet (12) and open the feed inlet (12) when the pressure in the pump chamber (61) decreases. The second sealing assembly (33) is used to block the discharge channel (311) and open the discharge channel (311) when the pressure in the pump chamber (61) increases. The support assembly (10) is provided with an installation cavity (11). The end cap (4) is connected to the inner wall of the installation cavity (11). The piston assembly (2) includes a piston head (211), a piston rod (212), and an operating member (23). The piston head (211) is located inside the end cap (4) and slides in cooperation with the inner wall of the installation cavity (11). One end of the piston rod (212) is connected to the piston head (211), and the other end extends to the outside of the end cap (4) and is connected to the operating member (23). The end cap (4) axially limits the piston head (211). A stroke gap is formed between the operating member (23) and the end cap (4). The position of the operating member (23) relative to the piston rod (212) is adjustable along the movement direction of the piston head (211).

2. The metering pump as described in claim 1, characterized in that, The operating component (23) is slidably engaged with the support assembly (10). The piston assembly (2) also includes an adjusting component (24). The adjusting component (24) is sleeved on the piston rod (212). The operating component (23) is sleeved on the adjusting component (24). The inner circumferential surface of the adjusting component (24) is provided with a first threaded portion, and the outer circumferential surface is provided with a second threaded portion. The first threaded portion is threadedly connected to the piston rod (212), and the second threaded portion is threadedly engaged with the operating component (23). The rotation directions of the first threaded portion and the second threaded portion are opposite.

3. The metering pump as described in claim 2, characterized in that, Of the operating element (23) and the adjusting element (24), one is provided with a dial and the other is provided with an indicator, the indicator being used to cooperate with the dial to indicate the amount of material discharged when the operating element (23) is pressed once; and / or The adjusting member (24) has a mating groove (241) on its end face, which is used to match with an external tool.

4. The metering pump as described in claim 1, characterized in that, The operating element (23) is rotatable relative to the support assembly (10) and is threadedly connected to the piston rod (212).

5. The metering pump according to any one of claims 1-4, characterized in that, The metering pump also includes a resilient reset member (5) connected between the end cap (4) and the operating member (23). The resilient reset member (5) is configured to position the piston assembly (2) in an initial position, in which the piston head (211) abuts against the end cap (4).

6. The metering pump as described in claim 5, characterized in that, The end cap (4) is provided with a first positioning guide groove (411) on the side facing the operating member (23), and one end of the elastic reset member (5) is installed in the first positioning guide groove (411); and / or The operating member (23) is provided with a second positioning guide groove (231) on the side facing the end cap (4), and the other end of the elastic reset member (5) is installed in the second positioning guide groove (231).

7. The metering pump according to any one of claims 1-4, characterized in that, The end cap (4) is sealed to the inner wall of the mounting cavity (11). The piston head (211) facing the piston rod (212) forms a buffer cavity (62) with the end cap (4). The support assembly (10) is also provided with a buffer hole (14). One end of the buffer hole (14) is connected to the buffer cavity (62), and the other end is used to connect to the inner cavity of the outer container body (300).

8. The metering pump according to any one of claims 1-4, characterized in that, The first sealing assembly (32) includes a first elastic element (322) and a first sealing element (321). The first sealing element (321) is slidably engaged with the support assembly (10) and is disposed opposite to the feed hole (12). The first elastic element (322) connects the support assembly (10) and the first sealing element (321). The first elastic element (322) is configured to press against the first sealing element (321) to block the feed hole (12); and / or The second sealing component (33) includes a second sealing element (331) and a second elastic element (332). The second sealing element (331) is disposed in the discharge channel (311). The second elastic element (332) connects the support component (10) and the second sealing element (331). The second elastic element (332) is configured to press against the second sealing element (331) to block the entrance of the discharge channel (311).

9. The metering pump according to any one of claims 1-4, characterized in that, The support component (10) is provided with an installation port (15), which is configured to be connected to the container body (300). A guide slope (16) is provided between the installation port (15) and the inlet of the feed hole (12), which is configured to guide the material to flow into the feed hole (12).

10. A container, characterized in that, The container includes a container body (300) and a metering pump as described in any one of claims 1-9, wherein the metering pump is installed at the opening of the container body (300) and the feed port (12) is connected to the inner cavity of the container body (300).

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