A foam pump with back suction effect

Abstract

This invention discloses a foam pump with a back-suction effect, comprising a pressure cap, an outer cap, a large beater, a small beater, a grinding cylinder, a spring, a grinding seat, a suction tube, a pull rod, and a grinding mesh. The pressure cap is snapped onto the large beater, which is located between the outer wall of the pressure cap and the grinding mesh. The grinding mesh is fixed in the inner cavity of the pressure cap, and the pressure cap can slide relative to the outer cap. The large beater is movably connected to the grinding cylinder and can slide along the inner wall of the grinding cylinder. The grinding cylinder is fixedly connected to the outer cap, and the large beater is connected to the small beater. A rib-like gap is provided at the joint. A pull rod is provided inside the small beater and is movably and sealingly connected to the small beater. The end of the pull rod extends into the long recess of the grinding seat, and a spring is sleeved on the pull rod. The spring is fixed to the grinding seat, and the grinding seat is fixed to the grinding cylinder. A ball valve is also provided inside the grinding cylinder. The upper end of the suction tube is fixed to the end of the grinding cylinder and communicates with it. This invention can back-suction foam at the outlet into the foam pump, eliminating liquid residue, preventing bacterial growth, and improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of press-type liquid foam pump technology, specifically a foam pump with a back-suction effect. Background Technology

[0002] Nowadays, people pay more attention to personal hygiene and health. They are accustomed to using cleansing solutions when washing their hands, face, and showering to achieve hygiene. To meet this demand, most cleansing solutions are packaged in bottles and poured out for application. To avoid waste due to excessive dispensing, a pump dispenser is usually installed on the top of the container. For example, common bottled shower gels often have a pump dispenser, allowing users to dispense a specific amount of liquid according to their needs, making it convenient for them.

[0003] After each use, a regular foam pump will leave liquid residue at the outlet, which may condense or drip, leading to bacterial growth. When used again, the contaminated liquid can irritate the skin and cause inconvenience to the user. Therefore, it is desirable to be able to draw back the residual liquid after pressing and squeezing out the pump to avoid leaving liquid residue at the outlet. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a foam pump with a back suction effect, which can solve the problem that liquid residue remains at the outlet after the existing foam pump is pressed.

[0005] The technical solution to achieve the objective of this invention is: a foam pump with a back-suction effect, comprising a pressure cap, an outer cap, a large beater, a small beater, a friction cylinder, a spring, a friction seat, a suction tube, a pull rod, and a friction mesh.

[0006] The pressure cap latch is located at the upper end of the large plate, with the upper end of the large plate positioned between the outer wall of the pressure cap and the mesh. The mesh is fixed within the inner cavity of the pressure cap. The pressure cap contacts the outer cap and can slide vertically relative to the outer cap, allowing the pressure cap to slide up and down axially relative to the outer cap.

[0007] The large paddle is located inside the outer cover. The lower end of the large paddle is movably connected to the upper end of the grinding cylinder, which is also located inside the outer cover. The lower end of the large paddle can slide up and down axially along the inner sidewall of the upper end of the grinding cylinder. The top end of the grinding cylinder is fixedly connected to the outer cover.

[0008] The lower middle part of the large paddle is connected to the upper part of the thin paddle, thus connecting the large paddle and the thin paddle. A bone gap is provided at the joint of the upper parts of the large paddle and the thin paddle, thus providing a bone gap at the joint of the large paddle and the thin paddle.

[0009] The thin paddle is located within a large cavity formed by the large paddle and the grinding cylinder. A pull rod is installed inside the thin paddle, with its top end sealed and movably connected to the top end of the thin paddle, allowing relative sliding between the thin paddle and the pull rod. A gap is left between the top end of the pull rod and the large paddle. The end of the pull rod extends into a long recess in the grinding seat. A spring is fitted onto the pull rod, positioned along its axial direction. The end of the spring furthest from the large paddle is fixed to the grinding seat, which is fixed to the lower end of the grinding cylinder and located within the large cavity.

[0010] A ball valve is installed inside the massage cylinder located below the massage seat. The lower end of the massage cylinder is connected to the suction tube, and the upper end of the suction tube is fixed to the end of the massage cylinder.

[0011] Furthermore, it also includes an outer cover that fastens to the top of the outer cover. The outer cover is used to protect the pressure cap located inside the outer cover from accidental pressing of the pressure cap before the foam pump is used for the first time, so as to prevent liquid from being squeezed out due to accidental pressing of the pressure cap.

[0012] Furthermore, the pressure cap includes an inner buckle line, which is used to fasten the pressure cap to the upper end of the large paddle. The upper end of the large paddle is located between the inner buckle line and the mesh, and the pressure cap is in contact with the outer cap.

[0013] Furthermore, the inner cavity of the outer cover includes an upper inner cavity and a lower inner cavity. The upper end of the large paddle extends into the upper inner cavity of the outer cover, and the lower end of the large paddle extends into the lower inner cavity of the outer cover. The end of the large paddle extending into the lower inner cavity is movably connected to the upper end of the grinding cylinder, which is also located in the lower inner cavity of the outer cover. The end of the large paddle can slide up and down in the axial direction along the inner wall of the upper end of the grinding cylinder.

[0014] Furthermore, the grinding cylinder is connected to the inner upper wall of the outer cover via a gasket.

[0015] Furthermore, a notch is provided in the middle of the lower end of the large paddle, which is connected to the upper end of the thin paddle, and a bone gap is provided at the junction of the notch of the large paddle and the upper end of the thin paddle.

[0016] Furthermore, the aforementioned gap is left between the top of the thin paddle and the notch of the large paddle.

[0017] Furthermore, the ball valve is a spherical ball.

[0018] The beneficial effects of this invention are as follows: After each press and release, the foam at the outlet can be drawn back into the foam pump, leaving no liquid residue. This prevents condensation at the outlet or dripping, which could lead to bacterial growth and improves the user experience. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0020] In the diagram, 1-outer cover, 2-pressure cap, 21-inner buckle line, 3-outer cover, 4-large paddle, 5-shield, 6-fine paddle, 7-magnet, 8-spring, 9-magnet seat, 10-ball valve, 11-sucking straw, 12-pull rod, 13-magnet. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] like Figure 1 As shown, a foam pump with a back-suction effect includes an outer cover 1, a pressure cap 2, an outer cover 3, a large flap 4, a small flap 6, a friction cylinder 7, a spring 8, a friction seat 9, a ball valve 10, a suction tube 11, a pull rod 12, and a friction mesh 13. The outer cover 1 is fastened to the top of the outer cover 3. The outer cover 1 is used to protect the pressure cap 2 located inside the outer cover 1 from accidental pressing before the foam pump is used for the first time, thereby preventing accidental pressing of the pressure cap 2 and squeezing out liquid before transportation and non-use.

[0023] The pressure cap 2 includes an inner buckle 21. The pressure cap 2 is fastened to the upper end of the large plate 4 by the inner buckle 21. The upper end of the large plate 4 is located between the inner buckle 21 and the mesh 13. The mesh 13 is fixed in the inner cavity of the pressure cap 2. The pressure cap 2 is in contact with the outer cover 3 and can slide vertically relative to the outer cover 3, so that the pressure cap 2 can slide up and down relative to the outer cover 3 along the axial direction.

[0024] The large paddle 4 is located within the inner cavity of the outer cover 3. The inner cavity of the outer cover 3 includes an upper inner cavity and a lower inner cavity. The upper end of the large paddle 4 extends into the upper inner cavity of the outer cover 3, and the lower end of the large paddle 4 extends into the lower inner cavity of the outer cover 3. The end of the large paddle 4 extending into the lower inner cavity is movably connected to the upper end of the friction cylinder 7, which is also located in the lower inner cavity of the outer cover 3. The end of the large paddle 4 can slide up and down axially along the inner sidewall of the upper end of the friction cylinder 7. The top of the friction cylinder 7 is fixedly connected to the outer cover 3, and the friction cylinder 7 can also be connected to the inner upper wall of the outer cover 3 through a gasket 5.

[0025] A notch is provided in the middle of the lower end of the large paddle 4, which connects to the upper end of the thin paddle 6, thus connecting the large paddle 4 and the thin paddle 6. A bone gap is provided at the junction of the notch of the large paddle 4 and the upper end of the thin paddle 6, thus providing a bone gap at the junction of the large paddle 4 and the thin paddle 6.

[0026] The thin paddle 6 is located within a large cavity formed by the large paddle 4 and the grinding cylinder 7. A pull rod 12 is installed inside the thin paddle 6, with its top end sealed and movablely connected to the top end of the thin paddle 6, allowing relative sliding between the thin paddle 6 and the pull rod 12. A gap is left between the top end of the pull rod 12 and the recess of the large paddle 4. The end of the pull rod 12 extends into the long recess of the grinding seat 9, and a spring 8 is sleeved on the pull rod 12. The spring 8 is arranged along the axial direction of the pull rod 12, and the end of the spring 8 away from the large paddle 4 is fixed to the grinding seat 9. The grinding seat 9 is fixed to the lower end of the grinding cylinder 7 and located within the large cavity.

[0027] A ball valve 10 is also installed inside the massage cylinder 7 located below the massage base 9. The lower end of the massage cylinder 7 of the ball valve 10 is connected to the suction tube 11, and the upper end of the suction tube 11 is fixed to the end of the massage cylinder 7. The ball valve 10 is a round ball and can be made of metal or non-metal materials.

[0028] In practical use, the foam pump is usually installed on a container containing liquid, such as a shower gel bottle, and is held against the container by the outer cover 3 (e.g., by tightening the threads on the inner wall of the outer cover 3 to the top of the container). Upon first use, the outer cover 1 is removed from the outer cover 3. After removing the outer cover 1, the pressure cap 2 is pressed down. The pressure cap 2 moves the large paddle 4 downwards via the inner fastening line 21. During this process, the outer cover 3 remains fixed because it is held against the container and the pressure cap 2 can slide relative to it. The large paddle 4 moves the small paddle 6 downwards. Due to the gap between the top of the pull rod 12 inside the small paddle 6 and the large paddle 4, and the friction between the pull rod 12 and the inner wall of the massage seat 9, the large paddle 4 and the small paddle 6 move downwards a certain distance before the large paddle 4 contacts the pull rod 12, thus opening the channel between the small paddle 6 and the pull rod 12. Upon continued pressing, the large paddle 4 contacts the lever 12, causing the lever 12 and the thin paddle 6 to move downwards together. The liquid in the lower cavity of the massage cylinder 7 flows out through the gap between the large paddle 4 and the thin paddle 6 to the open channel between the top of the lever 12 and the thin paddle 6, where it mixes with the air in the upper cavity of the massage cylinder 7. This gas-liquid mixture passes through the massage mesh 13 to form foam, which is then discharged through the discharge channel in the pressure cap 2, thus squeezing out the foam through pressing. The air in the upper cavity of the massage cylinder 7 enters from outside air through the gap between the pressure cap 2 and the outer cap 3. This air then enters the container through the small hole in the massage cylinder 7, balancing the pressure inside the container.

[0029] When pressing stops, for example, when the hand pressing the cap 2 is released, the top of the lever 12, under the action of the spring 8, forms a bevel seal with the thin plate 6, creating a (near) vacuum environment in the lower cavity of the grinding cylinder 7. Because the pressure inside the container is greater than the pressure inside the lower cavity of the grinding cylinder 7, the ball valve 10 moves slightly upward and opens. The liquid in the container passes through the suction tube 11 and the ball valve 10 and enters the lower space of the grinding cylinder 7 for storage. The volume of this space can be set as needed, for example, 0.4 CC. Simultaneously, after the cap 2 is released, a negative pressure is generated at the bottom of the large plate 4, causing the foam at the outlet (nozzle) of the cap 2 and the outside air to enter the upper cavity of the grinding cylinder 7 through the gap between the cap 2, the grinding mesh 13, the grinding mesh 13 and the large plate 4 to balance the air pressure, so as to draw the foam in the discharge channel inside the cap 2 back into the grinding cylinder 7, thus completing the foam reabsorption. When the cap 2 is pressed again, the foam that was previously drawn back into the cylinder 7, along with air, passes through the gap between the thin and large plates 6 and is expelled again. By repeating the pressing and releasing operation, foam liquid will be continuously squeezed out until the liquid is consumed or the external force of the pressing operation disappears. Moreover, after each pressing (i.e., releasing the hand), the foam at the outlet of the cap 2 can flow back again, completing the liquid back-drawing.

[0030] This invention allows the foam at the outlet to be drawn back into the foam pump after each press and release, preventing liquid residue and thus avoiding condensation or dripping at the outlet, which could lead to bacterial growth and improve the user experience.

[0031] The embodiments disclosed in this specification are merely illustrative of one aspect of the invention, and the scope of protection of the invention is not limited to these embodiments. Any other functionally equivalent embodiments fall within the scope of protection of the invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of this invention.

Claims

1. A foam pump with a back-suction effect, characterized in that, Includes pressure cap, outer cap, large paddle, small paddle, friction cylinder, spring, friction base, suction tube, pull rod, and friction mesh. The pressure cap latch is located at the upper end of the large plate, with the upper end of the large plate positioned between the outer wall of the pressure cap and the mesh. The mesh is fixed within the inner cavity of the pressure cap. The pressure cap contacts the outer cap and can slide vertically relative to the outer cap, allowing the pressure cap to slide up and down axially relative to the outer cap. The large paddle is located inside the outer cover. The lower end of the large paddle is movably connected to the upper end of the grinding cylinder, which is also located inside the outer cover. The lower end of the large paddle can slide up and down axially along the inner sidewall of the upper end of the grinding cylinder. The top end of the grinding cylinder is fixedly connected to the outer cover. The lower middle part of the large paddle is connected to the upper part of the thin paddle, thus connecting the large paddle and the thin paddle. A bone gap is provided at the joint of the upper parts of the large paddle and the thin paddle, thus providing a bone gap at the joint of the large paddle and the thin paddle. The thin paddle is located within a large cavity formed by the large paddle and the grinding cylinder. A pull rod is installed inside the thin paddle, with its top end sealed and movably connected to the top end of the thin paddle, allowing relative sliding between the thin paddle and the pull rod. A gap is left between the top end of the pull rod and the large paddle. The end of the pull rod extends into a long recess in the grinding seat. A spring is fitted onto the pull rod, positioned along its axial direction. The end of the spring furthest from the large paddle is fixed to the grinding seat, which is fixed to the lower end of the grinding cylinder and located within the large cavity. A ball valve is installed inside the massage cylinder located below the massage seat. The lower end of the massage cylinder is connected to the suction tube, and the upper end of the suction tube is fixed to the end of the massage cylinder.

2. The foam pump with back-suction effect according to claim 1, characterized in that, It also includes an outer cover that fastens to the top of the outer cover. The outer cover is used to protect the pressure cap located inside the outer cover from accidental pressing of the foam pump before initial use, and to prevent liquid from being squeezed out due to accidental pressing of the pressure cap.

3. The foam pump with back-suction effect according to claim 1, characterized in that, The pressure cap includes an inner buckle line, which is fastened to the upper end of the large paddle. The upper end of the large paddle is located between the inner buckle line and the mesh, and the pressure cap is in contact with the outer cover.

4. The foam pump with back-suction effect according to claim 1, characterized in that, The inner cavity of the outer cover includes an upper inner cavity and a lower inner cavity. The upper end of the large paddle extends into the upper inner cavity of the outer cover, and the lower end of the large paddle extends into the lower inner cavity of the outer cover. The end of the large paddle extending into the lower inner cavity is movably connected to the upper end of the grinding cylinder, which is also located in the lower inner cavity of the outer cover. The end of the large paddle can slide up and down in the axial direction along the inner wall of the upper end of the grinding cylinder.

5. The foam pump with back-suction effect according to claim 4, characterized in that, The grinding cylinder is connected to the inner upper wall of the outer cover via a gasket.

6. The foam pump with back-suction effect according to claim 4, characterized in that, A notch is provided in the middle of the lower end of the large paddle, which is connected to the upper end of the thin paddle. A bone gap is provided at the junction of the notch of the large paddle and the upper end of the thin paddle.

7. The foam pump with back-suction effect according to claim 6, characterized in that, The aforementioned gap is left between the top of the thin paddle and the notch of the large paddle.

8. The foam pump with back-suction effect according to claim 1, characterized in that, The ball valve is a round ball.

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