Pump body structure and foam pump

Abstract

The present invention discloses a pump body structure including an intake cylinder having an intake cavity therein and a return air hole at the bottom, an inlet cylinder connected to the bottom of the intake cylinder, a bottom cover connected to the bottom of the intake cylinder, the bottom cover having a cavity surrounded between the bottom cover, the outer wall of the inlet cylinder and the bottom wall of the intake cylinder, and a return air passage left between the bottom cover and the inlet cylinder, and an elastic check valve provided in the cavity for elastically capping the bottom of the return air hole. In the pump body structure of the present invention, the elastic check valve is protected in the cavity, and the bottom cover blocks a large amount of splashing liquid, and reduces the portion where the elastic check valve hardens due to long-term immersion in liquid. The present invention further discloses a foam pump including the above pump body structure, a first piston assembly, a second piston assembly, a foam generating mechanism, and a one-way valve. The foam pump of the present invention has a high foam generating effect. The present invention can be applied to the foam pump field.

Description

[Technical field]

[0001] The present invention relates to the field of foam pumps, and more particularly to a pump body structure and a foam pump. [Background technology]

[0002] A cleaning liquid such as hand soap or face wash is stored in the liquid storage container, and a foam pump is attached on the liquid storage container. The foam pump has a gas cavity and a liquid cavity, and the liquid in the liquid storage container is sucked into the liquid cavity, and the air in the gas cavity and the liquid in the liquid cavity are mixed by pressing a piston, and then foam is formed and discharged. The foam pump generally has a return hole in the gas cavity that communicates with the internal cavity of the liquid storage container, and the return hole is used to replenish gas into the liquid storage container to balance the air pressure in the liquid storage container, and an elastic check valve is further installed to block the return hole and prevent the liquid from flowing back through the return hole. However, when the liquid storage container is tipped over or shaken, the liquid in the liquid storage container is likely to come into contact with and adhere to the surface of the elastic check valve, and the liquid comes into contact with the elastic check valve for a long time, causing the elastic check valve to harden and lose its check ability. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a pump body structure and foam pump that overcomes one or more technical problems in the prior art, or at least provides a useful choice or creating conditions. [Means for solving the problem]

[0004] The technical solutions adopted to solve the above technical problems are as follows:

[0005] A pump body structure, an intake cylinder having an intake cavity therein, the intake cylinder being provided with a return air hole at a bottom portion of the intake cylinder for communicating the intake cavity with a space below the intake cylinder; an intake tube connected to a bottom of the intake tube; a lower lid connected to a bottom of the intake cylinder, a cavity being surrounded between the lower lid, an outer wall of the intake cylinder, and a bottom wall of the intake cylinder, and a return air passage being left between the lower lid and the intake cylinder, for communicating the cavity with a space below the lower lid; a resilient check valve disposed within the cavity for resiliently capping a bottom of the return air hole.

[0006] The beneficial effects of the present invention are as follows: the pump body structure is assembled into a foam pump and attached together with the storage container, the inlet cylinder is used to suck the liquid in the storage container, the return hole at the bottom of the inlet cylinder is used to communicate the intake cavity with the inner cavity of the storage container, and the elastic check valve is used to elastically cover the bottom of the return hole, to prevent the liquid in the storage container from flowing back from the return hole into the intake cavity. After the liquid in the storage container is discharged through the inlet tube, the air pressure in the storage container drops, and the air pressure in the intake cavity is greater than that of the storage container, so the gas in the intake cylinder pushes the top of the elastic check valve through the return air hole and deforms it downward, causing a gap to appear between the elastic check valve and the bottom of the return air hole, and the gas enters the cavity through the return air hole, and the gas in the cavity enters the storage container through the return air passage, so that the air pressure in the storage container is balanced, and after the air pressure in the intake cavity and the air pressure in the storage container are balanced, the top of the elastic check valve returns to its original position to cap the return air hole. When the storage container is overturned or shaken, the elastic check valve is protected within the cavity, so that the liquid is less likely to splash onto the elastic check valve, and the bottom cover blocks the liquid from splashing in large quantities. When liquid enters the cavity through the return air passage, the volume of the cavity is small and the amount of liquid entering the cavity is small, thereby reducing the contact area between the liquid and the elastic check valve, thereby reducing the area of ​​the elastic check valve immersed in the liquid and reducing the area of ​​the elastic check valve that hardens due to long-term immersion in the liquid.

[0007] As a further improvement of the above technical proposal, the lower cover is provided with an assembly hole penetrating vertically, the assembly hole is fitted into the outside of the inlet cylinder, the cavity goes around the outer periphery of the inlet cylinder, the return air passage is located between the inner wall of the assembly hole and the outer wall of the inlet cylinder, the elastic check valve is fitted into the outside of the inlet cylinder along the cavity, and the top of the lower cover abuts against the elastic check valve.

[0008] The assembly hole of the bottom cover is fitted to the outside of the inlet cylinder, the bottom cover, the outer wall of the inlet cylinder and the bottom wall of the intake cylinder form an annular cavity, the elastic check valve is fitted to the outside of the inlet cylinder along the annular cavity to connect the elastic check valve and the inlet cylinder, the top of the bottom cover abuts against the elastic check valve to prevent the elastic check valve from falling off the inlet cylinder downwards, and the elastic check valve can be firmly attached to the outside of the inlet cylinder. When the gas pushes out the top of the elastic check valve from the return air hole, the elastic check valve is blocked by the bottom cover and cannot move downwards, ensuring that the elastic check valve is capped at the bottom of the return air hole when it returns to its original position.

[0009] As a further improvement of the above technical proposal, an upwardly recessed concave cavity is provided on the bottom surface of the intake cylinder, the return air hole is located in the top wall of the concave cavity, the top of the inlet tube is connected to the top wall of the concave cavity, and the outer wall of the lower cover is hermetically connected to the inner wall of the concave cavity.

[0010] The return air hole is located in a concave cavity on the bottom surface of the intake cylinder, and the outer wall of the lower cover is sealedly connected to the inner wall of the concave cavity. A closed cavity is formed between the top wall of the concave cavity, the outer wall of the inlet cylinder, and the lower cover, and the return air passage is the only passage connecting the cavity with the space below. When the gas in the cavity flows through the return air passage to the space below, the gas can push the gas in the cavity to be discharged downward from the return air passage, which helps to reduce the liquid accumulated in the cavity.

[0011] As a further improvement of the above technical solution, a first air guide groove communicating with the bottom of the return air hole is provided on the top wall of the concave cavity, the first air guide groove extending into the inlet cylinder, a second air guide groove extending along the vertical direction is provided on the outer wall of the inlet cylinder, the second air guide groove communicating with the first air guide groove, the top of the elastic check valve is elastically capped by the return air hole and the first air guide groove, and the inner wall of the elastic check valve is elastically capped by the second air guide groove.

[0012] The first air groove on the top wall of the concave cavity communicates with the second air groove on the outer wall of the inlet cylinder, and an air passage is formed between the return air hole, the first air groove and the second air groove, and the elastic check valve elastically caps the air passage to prevent the liquid from flowing back from the air passage into the return air hole. When the air pressure difference occurs between the intake cavity and the lower space, the gas in the intake cavity first fills the return air hole, the first air groove and the second air groove to press the corresponding position of the elastic check valve, and then the gas pushes the bottom of the elastic check valve to expand it outward and flow into the lower space, which helps to reduce the air pressure difference required to connect the intake cylinder and the lower space.

[0013] As a further improvement of the above technical solution, the elastic check valve is divided into an upper part and a lower part, the upper part is elastically pressed between the inner wall of the concave cavity and the outer wall of the inlet cylinder, the top wall of the upper part is elastically capped with the return air hole and the first air guide groove, the inner wall of the upper part is elastically capped with the second air guide groove, the inner wall of the lower part is tightly attached to the outer wall of the inlet cylinder, a gap is left between the outer wall of the lower part and the bottom lid, and the top of the bottom lid abuts against the bottom of the upper part.

[0014] The elastic check valve is divided into an upper part and a lower part, the upper part is elastically pressed between the inner wall of the concave cavity and the outer wall of the inlet cylinder, the top of the bottom cover abuts against the bottom of the upper part, so that the upper part is firmly fixed and the upper part does not move downward, the top wall of the upper part is elastically capped against the bottom of the return air hole and the bottom of the first air groove, and the inner wall of the upper part is elastically capped against the second air groove. The inner wall of the lower part is tightly attached to the outer wall of the inlet cylinder, and a gap is left between the outer wall of the lower part and the lower cover, so that the lower part has room to expand outward. When a pressure difference occurs between the intake cavity and the space below, the gas in the intake cavity is first filled into the return air hole, the first air groove, and the second air groove, and then the gas expands outward downward, the gas flows into the cavity from the gap between the lower part and the outer wall of the inlet cylinder, and the gas flows from the return air passage to the space below.

[0015] As a further improvement of the above technical proposal, the inner wall of the assembly hole and the outer wall of the inlet cylinder are connected in a sealed manner, and a groove is provided in the inner wall of the assembly hole extending in the vertical direction, and the return air passage is formed between the groove and the outer wall of the inlet cylinder.

[0016] The inner wall of the lower cover assembly hole is sealed and connected to the outer wall of the inlet cylinder, and a return air passage is formed between the groove on the inner wall of the assembly hole and the outer wall of the inlet cylinder, so that the liquid cannot enter the cavity through the gap between the inner wall of the assembly hole and the outer wall of the inlet cylinder, and the return air passage is a single passage connecting the cavity and the space below. When the liquid enters the cavity from the return air passage, the liquid needs to flow through the return air passage to enter the cavity, and the gas in the cavity needs to flow through the return air passage to flow to the space below, so that the gas in the cavity effectively blocks the inflow of the liquid and greatly reduces the liquid from entering the cavity.

[0017] As a further improvement of the above technical solution, an annular protrusion is provided on the outer wall of the inlet tube, and the inner hole wall of the elastic check valve abuts against the annular protrusion.

[0018] The annular protrusion on the outer wall of the inlet tube abuts against the inner hole of the elastic check valve, contributing to fixing the elastic check valve and preventing the elastic check valve from coming off the inlet tube.

[0019] 1. A foam pump comprising: the pump body structure, in which the inside of the inlet tube has a liquid inlet cavity and a liquid inlet hole communicating with the outside is provided at the bottom of the inlet tube; a first piston assembly provided in the intake cavity so as to be slidable up and down and having a mixing cavity at its top communicating with an upper space; a second piston assembly, the top of which is connected to the first piston assembly, the bottom of which is slidably disposed in the liquid inlet cavity, and the top of the first piston assembly is connected to the mixing cavity; a foam generating mechanism disposed within the mixing cavity; and a one-way valve that covers the liquid inlet hole and allows liquid to flow from bottom to top.

[0020] The foam pump is attached to the mouth of the liquid storage container, and the first piston assembly is pressed downward. The first piston assembly compresses the space of the intake cavity, and the second piston assembly compresses the space of the liquid inlet cavity. The gas in the intake cavity is discharged to the mixing cavity through the first piston assembly, and the liquid in the liquid inlet cavity is discharged to the mixing cavity through the second piston assembly. The gas and the liquid are mixed in the mixing cavity, and then foam is formed by the action of the foam generating mechanism and then discharged. The first piston assembly is pulled up, and the second piston assembly and the first piston assembly return to their original positions. Since the amount of gas in the intake cavity is reduced, the air pressure in the intake cavity is lower than the external air pressure, and the external gas enters the intake cavity through the first piston assembly. Due to the decrease in the amount of liquid in the inlet cavity, the liquid in the storage container flows from the inlet hole through the one-way valve from bottom to top into the inlet cavity, the amount of liquid in the storage container decreases, and the air pressure in the storage container becomes lower than the external air pressure. After the air pressure in the intake cavity and the external air pressure are balanced, the air pressure in the intake cavity is greater than the air pressure in the storage container, and the air pressure causes the top of the elastic check valve to deform downward, forming a gap between the top of the elastic check valve and the bottom wall of the intake cylinder, and the gas in the intake cavity is replenished into the storage container through the return air hole, so that the air pressure in the storage container and the air pressure in the intake cavity are balanced, and the foam generating operation of the foam pump is smoother and the foam generating effect is higher.

[0021] As a further improvement of the above technical solution, the foam pump further includes a top cover connected to the top of the intake cylinder, a mounting seat extending to the outside of the intake cylinder is provided at the bottom of the top cover, the mounting seat goes around the outer periphery of the intake cylinder, a mounting space is formed between the inner wall of the mounting seat and the outer wall of the intake cylinder, and a sealing ring is provided at the top of the mounting space.

[0022] The foam pump is attached to the liquid storage container, and both the inlet cylinder and the intake cylinder are inserted into the internal cavity of the liquid storage container, forming an installation space between the inner wall of the mounting seat of the top cover and the outer wall of the intake cylinder. The bottle mouth of the liquid storage container is inserted into the installation space, and the top of the bottle mouth is pressed against the sealing ring, thereby forming a sealed structure between the bottle mouth of the liquid storage container, the outer wall of the intake cylinder, and the inner wall of the mounting seat, thereby preventing the liquid inside the liquid storage container from overflowing from the bottle mouth when the liquid storage container is tipped over or shaken.

[0023] As a further improvement of the above technical solution, the foam pump further includes an elastic member which is a plastic spring, the elastic member is arranged in the intake cavity, and both upper and lower ends of the elastic member abut against the top of the second piston assembly and the bottom wall of the intake cavity, respectively.

[0024] The elastic member automatically bounces the first piston assembly and the second piston assembly upward, making the foam pump easier to use. The elastic member is a plastic spring, and the entire foam pump is of plastic construction, so that the foam pump can be retrieved as a whole, and there is no need to disassemble the elastic member separately.

[0025] In the following the invention will be further explained with reference to the figures and examples. [Brief description of the drawings]

[0026] [Figure 1] 1 is an exploded schematic view of an embodiment of a pump body structure according to the present invention; [Diagram 2] 1 is a cross-sectional schematic view of one embodiment of a pump body structure according to the present invention. [Diagram 3] FIG. 3 is an enlarged schematic view of A in FIG. [Figure 4] 1 is an exploded cross-sectional schematic view of an embodiment of a pump body structure according to the present invention; [Diagram 5] 1 is a schematic diagram of an intake cylinder in an embodiment of a pump body structure according to the present invention; [Figure 6] FIG. 6 is an enlarged schematic view of B in FIG. [Figure 7] 1 is a cross-sectional schematic view of one embodiment of a foam pump in accordance with the present invention. [Figure 8] 1 is an exploded schematic view of one embodiment of a foam pump in accordance with the present invention; FIG. [Figure 9] 1 is an exploded cross-sectional schematic view of one embodiment of a foam pump according to the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] This section describes in detail specific embodiments of the present invention, and preferred embodiments of the present invention are shown in the accompanying drawings. The accompanying drawings are intended to graphically supplement the written description of the specification, thereby enabling intuitive and imaginative understanding of each technical feature and the overall technical solution of the present invention, but should not be construed as limiting the protection scope of the present invention.

[0028] In describing the present invention, orientation descriptions, such as up, down, front, back, left, right, and the like, are orientations or positional relationships shown based on the drawings, and are only for ease of explanation and simplification of the present application, and are not intended to indicate or imply that the devices or elements referred to necessarily have a particular orientation or are constructed and operated in a particular orientation, and therefore should not be understood as limiting the present invention.

[0029] In the description of the present invention, when a word description such as "plurality" appears, it means one or more. Plural means two or more. Greater than, less than, exceed, etc. are understood as not including a number. Greater than, less than, within, etc. are understood as including a number.

[0030] In describing the present invention, unless otherwise clearly limited, terms such as providing, mounting, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention by combining the specific content of the technical solutions.

[0031] 1 to 5, the pump body structure of the present invention is embodied as follows. The pump body structure includes an intake cylinder 100 , an inlet cylinder 200 , an elastic check valve 300 , and a bottom cover 400 .

[0032] The intake cylinder 100 and the inlet cylinder 200 are integrally injection molded from plastic, and both the inlet cylinder 200 and the intake cylinder 100 have a cylindrical structure, the outer diameter of the intake cylinder 100 is larger than the outer diameter of the inlet cylinder 200, and an upwardly recessed concave cavity 130 is provided on the bottom surface of the intake cylinder 100, the top of the inlet cylinder 200 is connected to the top wall of the concave cavity 130, and the concave cavity 130 forms a ring shape that goes around the outer periphery of the inlet cylinder 200.

[0033] An intake cavity 110 extending in the vertical direction is provided inside the intake cylinder 100, and a liquid inlet cavity 220 extending in the vertical direction is provided inside the liquid inlet cylinder 200. The top of the intake cylinder 100 is open, and the top of the liquid inlet cavity 220 communicates with the bottom of the intake cavity 110. A liquid inlet hole 230 is provided at the bottom of the liquid inlet cylinder 200 to communicate the liquid inlet cavity 220 with the space below, and a return hole 120 is provided on the top wall of the concave cavity 130 to communicate the intake cavity 110 with the space below. A second air guide groove 2001 extending in the vertical direction is provided on the outer wall of the inlet tube 200, and a first air guide groove 1301 is provided on the top wall of the concave cavity 130. One end of the first air guide groove 1301 is connected to the bottom of the return air hole 120, and the other end extends into the inlet tube 200 and communicates with the second air guide groove 2001.

[0034] The lower cover 400 is provided with an assembly hole 410 that penetrates in the vertical direction. The assembly hole 410 is a stepped hole that is larger at the top and smaller at the bottom. The assembly hole 410 is fitted into the outside of the liquid-inlet cylinder 200. The hole diameter of the lower part of the assembly hole 410 matches the outer diameter of the liquid-inlet cylinder 200, and the lower part of the assembly hole 410 is tightly fitted into the liquid-inlet cylinder 200. The shape of the outer wall of the lower cover 400 matches the shape of the inner wall of the annular step 1302 of the concave cavity 130, and the outer wall of the lower cover 400 and the inner wall of the annular step 1302 are connected in a sealed manner. A cavity 401 is formed between the upper part of the assembly hole 410, the outer wall of the liquid-inlet cylinder 200, and the top wall of the concave cavity 130. The cavity 401 goes around the outside of the liquid-inlet cylinder 200 to form an annular shape.

[0035] The elastic check valve 300 has an annular shape, and is provided in the cavity 401. The elastic check valve 300 is fitted around the outside of the inlet tube 200 along the concave cavity 130. The outer wall of the inlet tube 200 is provided with an annular protrusion 210, and the inner hole wall of the elastic check valve 300 abuts against the annular protrusion 210. The elastic check valve 300 includes an upper portion 301 and a lower portion 302 that are distributed vertically. The thickness of the upper portion 301 in the inward and outward direction is greater than the thickness of the lower portion 302 in the inward and outward direction. The top of the upper portion 301 covers the return air hole 120 and the first air guide groove 1301. The inner wall of the upper portion 301 covers the second air guide groove 2001. The lower portion 302 extends downward along the outer wall of the inlet tube 200. A gap is left between the upper portion of assembly hole 410 and lower portion 302 to allow lower portion 302 some room to expand outwardly.

[0036] The inner wall of the concave cavity 130 is provided with an annular staircase 1302, which expands outward, so that the vertical cross-sectional shape of the concave cavity 130 is a step hole shape with a smaller upper part and a larger lower part. The upper part 301 is elastically pressed between the inner wall of the concave cavity 130 and the outer wall of the inlet tube 200, and a gap is left between the outer wall of the lower part 302 and the inner wall of the annular staircase 1302, allowing the lower part 302 to have room to expand and deform outward. The thickness of the upper part 301 in the inner and outer directions is greater than that of the lower part 302 in the inner and outer directions, so that the gas flows downward through the return air hole 120, the first air guide groove 1301, and the second air guide groove 2001, and then the gas pushes the lower part 302 to expand and deform outward, allowing the gas to flow smoothly.

[0037] The top of the lower cover 400 abuts against the bottom of the upper part 301, so that the elastic check valve 300 is protected between the lower cover 400 and the concave cavity 130. A concave groove 411 is provided in the inner wall of the assembly hole 410, penetrating in the vertical direction, and the concave groove 411 forms a return air passage 402 between the inner wall of the assembly hole 410 and the outer wall of the liquid inlet tube 200, which connects the cavity 401 with the space below, thereby allowing the gas flowing downward through the return air hole 120, the first air guide groove 1301, and the second air guide groove 2001 to expand the lower part 302, and then to flow downward through the return air passage 402.

[0038] The elastic check valve 300 elastically blocks the bottom of the return air hole 120 due to the elastic recovery property of the elastic check valve 300 itself. When the air pressure above the return air hole 120 is greater than the air pressure in the cavity 401, the gas in the return air hole 120 pushes the top of the elastic check valve 300 and deforms it downward, so that a gap appears between the top of the elastic check valve 300 and the bottom of the return air hole 120, allowing the gas to flow downward into the cavity 401 through the gap. When the air pressure above the return air hole 120 is equal to the air pressure in the cavity 401, the top of the elastic check valve 300 returns to its original state and blocks the bottom of the return air hole 120 due to the elastic recovery ability of the elastic check valve 300 itself. When the air pressure above the return air hole 120 is lower than the air pressure within the cavity 401, the gas within the cavity 401 pushes the elastic check valve 300 upward and into close contact with the bottom of the return air hole 120, thereby blocking the bottom of the return air hole 120.

[0039] In some embodiments, the bottom of the intake cylinder 100 is flat, the return air hole 120 penetrates the bottom of the intake cylinder 100 in the vertical direction, the bottom cover 400 is connected to the bottom of the intake cylinder 100, a cavity 401 is formed between the bottom cover 400, the outer wall of the inlet cylinder 200, and the bottom wall of the intake cylinder 100, the elastic check valve 300 is filled in the cavity 401, and a gap is left between the bottom cover 400 and the inlet cylinder 200, thereby realizing that the elastic check valve 300 is protected within the cavity 401 by the bottom cover 400.

[0040] 6 to 8, the foam pump of the present invention is embodied as follows. The foam pump includes the above-mentioned pump body structure, a one-way valve 240 , a first piston assembly 500 , a second piston assembly 600 , a foam generating mechanism 700 , an elastic member 800 , a top cover 900 , and a pressing head 950 .

[0041] The first piston assembly 500 is provided in the intake cavity 110 so as to be slidable up and down, and a mixing cavity 510 and an intake hole 520 are provided at the top of the first piston assembly 500, and the mixing cavity 510 penetrates the center of the first piston assembly 500 along the up and down direction, and has a plurality of intake holes 520, and all the intake holes 520 are distributed at intervals around the mixing cavity 510. The outer wall of the first piston assembly 500 is sealed to the inner wall of the intake cavity 110, and the top of the second piston assembly 600 is connected to the bottom of the first piston assembly 500, and the bottom of the second piston assembly 600 is provided in the liquid inlet cavity 220 so as to be slidable up and down, and the bottom outer wall of the second piston assembly 600 is sealed to the inner wall of the liquid inlet cavity 220. A liquid discharge passage 610 is provided in the middle of the second piston assembly 600, penetrating in the vertical direction, with the top of the liquid discharge passage 610 communicating with the mixing cavity 510 and the bottom of the liquid discharge passage 610 communicating with the liquid inlet cavity 220. A one-way valve 240 is provided in the liquid inlet cavity 220, and the one-way valve 240 is provided to cover the top of the liquid inlet hole 230, with the flow direction of the one-way valve 240 being from bottom to top.

[0042] A gap is left between the top outer wall of the second piston assembly 600 and the first piston assembly 500 to form an airflow passage communicating with the mixing cavity 510. The first piston assembly 500 further includes a first elastic valve sheet 560 and a second elastic valve sheet 570, the first elastic valve sheet 560 is connected to the first piston assembly 500, the first elastic valve sheet 560 has a circular shape, and the first elastic valve sheet 560 has an inner valve sheet 561 and an outer valve sheet 562. The inner valve sheet 561 covers the bottom of the airflow passage, and when the inner valve sheet 561 elastically returns upward, the inner valve sheet 561 opens the bottom of the airflow passage downward. The external valve sheet 562 is provided to cover the intake hole 520, and when the external valve sheet 562 elastically returns upward, the external valve sheet 562 closes the intake hole 520 upward.

[0043] The second elastic valve sheet 570 has a circular ring shape, and is connected to the bottom wall of the intake cavity 110. The second elastic valve sheet 570 covers the top of the return air hole 120. When the second elastic valve sheet 570 elastically returns downward, the second elastic valve sheet 270 closes the top of the return air hole 120 downward.

[0044] The foam generating mechanism 700 includes a cylinder that penetrates from top to bottom, an upper foam forming net, and a lower foam forming net, the upper foam forming net and the lower foam forming net being respectively covered at the top and bottom ends of the cylinder, and the foam generating mechanism 700 is provided at the top of the mixing cavity 510.

[0045] The elastic member 800 is a plastic spring that is fitted onto the outside of the second piston assembly 600, with the upper and lower ends of the elastic member 800 pressed against the top of the second piston assembly 600 and the bottom wall of the intake cavity 110, respectively.

[0046] The top cover 900 is provided with a mounting hole penetrating vertically, the shape of the mounting hole is such that it faces the opening at the top of the intake cylinder 100, the mixing cavity 510 of the first piston assembly 500 extends upward through the mounting hole, and the foam generating mechanism 700 is located above the mounting hole. The top cover 900 is connected to the top of the intake cylinder 100, and a mounting seat 910 is provided at the bottom of the top cover 900, extending to the outside of the intake cylinder 100, the mounting seat 910 goes around the outer periphery of the intake cylinder 100, a mounting space 920 is formed between the inner wall of the mounting seat 910 and the outer wall of the intake cylinder 100, a sealing ring 930 is provided at the top of the mounting space 920, and an inner wall of the mounting seat 910 is provided with an internal thread.

[0047] The press head 950 is connected to the tip of the first piston assembly 500, and has a discharge passage 951 communicating with the mixing cavity 510. The bottom of the press head 950 is positioned within the mounting hole of the top cover 900, and the press head 950 is capable of sliding up and down along the mounting hole.

[0048] The foam pump is attached to the mouth of the liquid storage container, the liquid inlet tube 200 and the intake tube 100 are inserted into the liquid storage container, the liquid inlet hole 230 comes into contact with the liquid in the liquid storage container, the bottom wall of the intake tube 100 is higher than the liquid level in the liquid storage container, the bottle mouth of the liquid storage container is inserted into the mounting space 920, the outer thread of the bottle mouth is screwed into the inner thread of the mounting seat 910, and the top of the bottle mouth is pressed against the sealing ring 930 to seal the bottle mouth.

[0049] When the foam pump is used, pressing head 950 is pressed, and pressing head 950 pushes first piston assembly 500 to move downward, and first piston assembly 500 moves second piston assembly 600 to move downward, and first piston assembly 500 compresses the space of intake cavity 110, and second piston assembly 600 compresses the space of inlet cavity 220, increasing the air pressure of intake cavity 110, and inner valve seat 561 of first elastic valve seat 560 opens the air flow passage upward, and outer valve seat 562 opens the air flow passage upward, and outer valve seat 563 opens the air flow passage upward, and outer valve seat 564 opens the air flow passage upward, and outer valve seat 565 opens the air flow passage upward, and outer valve seat 566 opens the air flow passage upward, and outer valve seat 567 opens the air flow passage upward, and outer valve seat 568 opens the air flow passage upward, and outer valve seat 569 ... Sheet 562 closes the bottom of air intake hole 520 upward, and second elastic valve sheet 570 closes the top of air return hole 120 downward, so that gas in intake cavity 110 flows through the air flow passage into mixing cavity 510, the air pressure in liquid inlet cavity 220 increases, and liquid in liquid inlet cavity 220 flows upward into mixing cavity 510 through liquid discharge passage 610, the gas and liquid are mixed in mixing cavity 510 and then pass through foam generating mechanism 700 to form foam, and the foam is discharged from discharge passage 951 of pressing head 950.

[0050] The pressing head 950 is released, and the elastic member 800 pushes the second piston assembly 600 and the first piston assembly 500 to return upward. Because the amount of gas in the intake cavity 110 decreases and the amount of liquid in the liquid inlet cavity 220 decreases, the air pressure in the intake cavity 110 is lower than the external air pressure, so that the internal valve sheet 561 of the first elastic valve sheet 560 closes the airflow passage downward, the external valve sheet 562 opens the bottom of the intake hole 520 downward, and the second elastic valve sheet 570 opens the top of the return hole 120 upward, and the external gas enters the intake cavity 110 from the intake hole 520. As the amount of liquid in the liquid inlet cavity 220 decreases, the air pressure in the liquid inlet cavity 220 is lower than that in the liquid storage container, so that the liquid in the liquid discharge container flows from bottom to top into the liquid inlet cavity 220 through the liquid inlet hole 230 and the one-way valve 240, and the air pressure in the liquid inlet cavity 220 and the outside air pressure are balanced. As the amount of liquid in the liquid storage container decreases, the air pressure in the liquid storage container is lower than that in the intake cavity 110, so that the second elastic valve sheet 570 opens the top of the return air hole 120 upward, and the gas in the intake cavity 110 pushes the lower part 302 of the elastic check valve 300 to expand outward after passing through the return air hole 120, the first air guide groove 1301, and the second air guide groove 2001, so that the gas is replenished in the liquid storage container, and the air pressure in the liquid storage container and the intake cavity 110 are balanced.

[0051] When the foam pump and the liquid storage container are at rest, the mouth of the liquid storage container is sealed by the top cover 900, the sealing ring 930 and the intake cylinder 100, the second elastic valve sheet 570 closes the top of the air return hole 120, the upper part 301 of the elastic check valve 300 blocks the air return hole 120, the first air guide groove 1301 and the second air guide groove 2001, the liquid in the liquid inlet cavity 220 pushes the one-way valve 240 downward, and the one-way valve 240 closes the liquid inlet hole 230, thereby sealingly storing the liquid in the liquid storage container.

[0052] In some embodiments, there is no need to install the elastic member 800, and the foam pump function can also be achieved by manually pushing down the first piston assembly 500 or manually pulling up the first piston assembly 500.

[0053] In some embodiments, the elastic member 800 may be an elastic body that can return to its original shape after being compressed, such as a metal spring, elastic rubber, or elastic sponge.

[0054] Although the above describes preferred embodiments of the present invention in detail, the creation of the present invention is not limited to the above examples. Those skilled in the art may make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope defined by the claims of this application. [Explanation of symbols]

[0055] 100, intake cylinder 110. Intake cavity 120, return air vent 130, concave cavity 1301, the first air channel 1302, circular staircase 200, liquid cylinder 2001, the second air channel 210, annular protrusion 220, liquid inlet cavity 230, liquid inlet hole 240, one-way valve 300, elastic check valve 301, upper part 302, lower part 400, lower lid 401, Cavity 402, return air passage 410, assembly hole 411, groove 500, first piston assembly 510, Mixed Cavity 520, air intake 560, first elastic valve seat 561, Internal valve seat 562, external valve seat 570, second elastomeric valve seat 600, second piston assembly 610, liquid discharge passage 700, Form Generation Mechanism 800, elastic member 900, upper lid 910, mounting base 920, installation space 930, sealing ring 950, Pressing head 951, discharge passage

Claims

1. An intake cylinder (100) having an intake cavity (110) therein, the intake cylinder (100) having a return air hole (120) at a bottom portion of the intake cylinder (100) for communicating the intake cavity (110) with a space below the intake cylinder (100); an intake cylinder (200) connected to the bottom of the intake cylinder (100); a lower cover (400) connected to a bottom of the intake cylinder (100), wherein a cavity (401) is enclosed between the lower cover (400), an outer wall of the inlet cylinder (200), and a bottom wall of the intake cylinder (100), and a return air passage (402) is left between the lower cover (400) and the inlet cylinder (200) to connect the cavity (401) to a space below the lower cover (400); an elastic check valve (300) provided in the cavity (401) for elastically blocking the bottom of the return air hole (120); The bottom cover (400) is provided with an assembly hole (410) penetrating vertically, the assembly hole (410) is fitted to the outside of the inlet tube (200), the cavity (401) goes around the outer periphery of the inlet tube (200), the return air passage (402) is located between the inner wall of the assembly hole (410) and the outer wall of the inlet tube (200), the elastic check valve (300) is fitted to the outside of the inlet tube (200) along the cavity (401), and the top of the bottom cover (400) abuts against the elastic check valve (300), The bottom surface of the intake cylinder (100) is provided with an upwardly recessed concave cavity (130), the return air hole (120) is located on the top wall of the concave cavity (130), the top of the inlet tube (200) is connected to the top wall of the concave cavity (130), and the outer wall of the lower cover (400) is hermetically connected to the inner wall of the concave cavity (130), A first air guide groove (1301) communicating with the bottom of the return air hole (120) is provided on the top wall of the concave cavity (130), and the first air guide groove (1301) extends to the inlet tube (200). A second air guide groove (2001) extending in the vertical direction is provided on the outer wall of the inlet tube (200). The second air guide groove (2001) communicates with the first air guide groove (1301). The top of the elastic check valve (300) elastically blocks the return air hole (120) and the first air guide groove (1301). The inner wall of the elastic check valve (300) elastically blocks the second air guide groove (2001). A pump body structure comprising:

2. 2. The pump body structure according to claim 1, wherein the elastic check valve (300) is divided into an upper part (301) and a lower part (302), the upper part (301) is elastically pressed between an inner wall of the concave cavity (130) and an outer wall of the inlet tube (200), a top wall of the upper part (301) elastically blocks the return air hole (120) and the first air guide groove (1301), an inner wall of the upper part (301) elastically blocks the second air guide groove (2001), an inner wall of the lower part (302) is tightly attached to the outer wall of the inlet tube (200), a gap is left between the outer wall of the lower part (302) and the bottom cover (400), and a top of the bottom cover (400) abuts against a bottom part of the upper part (301).

3. 2. The pump body structure according to claim 1, wherein an inner wall of the assembly hole (410) and an outer wall of the inlet tube (200) are connected in a sealed manner, a groove (411) is provided in the inner wall of the assembly hole (410) penetrating in the vertical direction, and the return air passage (402) is formed between the groove (411) and the outer wall of the inlet tube (200).

4. 2. The pump body structure according to claim 1, wherein an annular protrusion (210) is provided on an outer wall of the inlet tube (200), and an inner wall of the elastic check valve (300) abuts against the annular protrusion (210).

5. The pump body structure according to any one of claims 1 to 4, wherein the inside of the liquid inlet tube (200) has a liquid inlet cavity (220), and a liquid inlet hole (230) communicating with the outside is provided at a bottom of the liquid inlet tube (200); A first piston assembly (500) that is slidably disposed in the intake cavity (110) and has a mixing cavity (510) at its top that communicates with an upper space; a second piston assembly (600) having a top connected to the first piston assembly (500) and a bottom slidably disposed within the liquid inlet cavity (220) so that the top of the first piston assembly (500) is in communication with the mixing cavity (510); a foam generating mechanism (700) provided in the mixing cavity (510); and a one-way valve (240) that is fitted to cover the liquid inlet hole (230) and allows liquid to flow from bottom to top.

6. 6. The foam pump of claim 5, further comprising a top cover (900) connected to the top of the intake cylinder (100), a mounting seat (910) extending to the outside of the intake cylinder (100) is provided at the bottom of the top cover (900), the mounting seat (910) goes around the outer periphery of the intake cylinder (100), a mounting space (920) is formed between the inner wall of the mounting seat (910) and the outer wall of the intake cylinder (100), and a sealing ring (930) is provided at the top of the mounting space (920).

7. The foam pump of claim 5, further comprising an elastic member (800) which is a plastic spring, the elastic member (800) being disposed within the intake cavity (110), and both upper and lower ends of the elastic member (800) abutting against the top of the second piston assembly (600) and the bottom wall of the intake cavity (110), respectively.

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