Novel foam pump

Abstract

The novel foam pump comprises a gland, a net, a large bat, an outer cover, a thin bat, a middle sleeve, a spring, a middle sleeve, a piston, a pull rod, a valve and a suction pipe, the gland penetrates through the outer cover and is connected with the large bat located in the gland, the lower end of the large bat is connected with the thin bat, the thin bat further extends into an inner cavity of an inner column, the spring is arranged on the thin bat in a sleeved mode, and the piston is installed on the inner column. The upper end of the piston extends into a cavity of the fine racket, the piston is communicated and connected with the pull rod, the pull rod is located in the cavity of the fine racket, the lower end of the piston extends into an inner cavity of the inner column, the pull rod is communicated and connected with the net, the valve is installed in the inner cavity of the inner column, the inner cavity is further communicated and connected with the suction pipe, and the valve is arranged between the suction pipe and the fine racket. The pull rod is provided with a plurality of liquid flow grooves, the liquid flow grooves are formed in the axial direction of the pull rod, and the liquid flow grooves are communicated and connected with the piston and the mesh respectively. According to the utility model, the spring can be well limited in the axial direction, the generated foam is more dense, and the user experience is high.

Description

Technical Field

[0001] This utility model relates to the field of foam pump technology, specifically a novel foam pump. Background Technology

[0002] Foam pumps are components used in bottled products in daily life, such as shower gel and shampoo. These products contain foam pumps to expel liquids (e.g., shower gel) from the container. Before use, the foam pump needs to be sealed to prevent accidental liquid leakage. Current foam pumps typically achieve a seal by stretching a spring to support the internal seals. Because the spring is constantly stretched, it is prone to deformation and fatigue, reducing its lifespan, especially when plastic springs are used.

[0003] Furthermore, existing foam pumps often only limit or fix the springs at the top and bottom, without limiting or fixing them in the left-right and / or front-back directions. This makes the springs prone to displacement, affecting their extension and contraction, and consequently impacting the normal operation of the foam pump. Additionally, simply fitting the springs onto the corresponding components without any corresponding structural design for the spring connection and installation can lead to unstable spring installations.

[0004] In existing foam pumps, the channel through which the liquid is extruded is often a large channel, through which all the liquid is extruded. This results in less dense foam and a less satisfactory user experience. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a new type of foam pump that can solve the problems described in the background art.

[0006] The technical solution to achieve the purpose of this utility model is as follows: A novel foam pump includes a pressure cap, a mesh screen, a large beater, an outer cover, a thin beater, a middle sleeve, a spring, a cylinder, a piston, a pull rod, a valve, and a suction tube. The pressure cap passes through the outer cover and is connected to the large beater located inside the pressure cap. The outer cover is installed on the pressure cap. The upper end of the large beater is connected to the mesh screen, which is fixed in the inner cavity of the pressure cap. The cylinder includes an inner column. The lower end of the large beater is connected to the thin beater, which also extends into the inner cavity of the inner column. The spring is sleeved on the thin beater. The upper end of the spring abuts against or is spaced apart from a circumferential groove at the upper end of a long column. The circumferential groove is located near the notch at the upper end of the long column. The lower end of the spring is sleeved on the inner column inside the cylinder, which is fixed in the inner cavity of the cylinder.

[0007] The piston is mounted on the inner column, with its upper end extending into the cavity of the middle sleeve and the lower end of the thin plate extending into the cavity of the middle sleeve. The piston is connected to a pull rod, which is located within the cavity of the thin plate. The lower end of the piston extends into the inner cavity of the inner column, and the pull rod is connected to the mesh.

[0008] The valve is installed in the inner cavity of the inner column, and the inner cavity is also connected to the straw. The valve is located between the straw and the fine tap.

[0009] The pull rod is provided with several fluid flow channels, which are arranged along the axial direction of the pull rod and are respectively connected to the piston and the mesh.

[0010] Furthermore, the spring includes a spring head, a spring part, and a spring bottom connected in sequence. The spring head has an uneven structure along its circumferential outer edge. The spring part has a continuous structure, with one end connected to the spring head and the other end extending continuously until it connects to the spring bottom. The spring bottom has a number of grooves along its circumferential outer edge, with each groove spaced apart.

[0011] Furthermore, the edge of the circumferential groove on the thin plate is provided with several limiting blocks, which are distributed at intervals and can be used to limit the spring.

[0012] Furthermore, a number of limiting plates are provided on the outer side of the inner column, and each limiting plate is arranged at intervals around the inner column.

[0013] Furthermore, the piston includes a piston seat and a piston rod, the piston rod and the piston seat are fixedly connected, the piston rod is provided with a through hole and a through cavity, the through hole and the through cavity are connected in communication, the through hole is arranged radially along the piston rod, and the through cavity is arranged axially along the piston rod, the liquid can flow into the through cavity in the piston rod through the through hole, and then flow into the liquid flow groove of the pull rod through the through cavity.

[0014] Furthermore, the valve includes a valve body, a movable part and several connecting parts disposed on the valve body, one end of each connecting part being connected to the movable part and to the valve body, and the connecting parts being arranged around the movable part, allowing the movable part to move relative to the connecting parts, thereby causing the movable part to protrude to a first position and a second position.

[0015] First position: The end faces of the moving part, connecting part, and valve body are flush, so that the moving part seals against the joint between the valve and the cylinder, thereby making the suction tube and the cylinder a sealed connection.

[0016] Second position: The movable part protrudes from the end face of the connecting part and the valve body. The movable part is separated from the joint between the valve and the cylinder, so that the straw and the cylinder become connected again.

[0017] Furthermore, a step is provided in the middle of the inner cavity of the inner column of the tube, and the valve is located on the step. When the movable part is in the first position, the movable part abuts against the step to seal the connection between the straw and the tube; when the movable part is in the second position, the movable part disengages from the step, so that the straw and the tube become connected.

[0018] Furthermore, a through cavity is provided inside the long column, which is arranged along the axial direction of the long column. The pull rod is embedded in the through cavity, with the upper end of the pull rod extending out of the through cavity and communicating with the mesh. The lower end of the mesh extends into the through cavity, and the lower end of the long column extends into the inner cavity of the inner column. The piston can slide along the axial direction of the piston rod, and the upper end of the piston also extends into the inner cavity of the inner column, so that the piston is connected to the long column, and thus the piston is connected to the pull rod. A middle sleeve is fixedly provided at the upper end of the inner column, and the middle sleeve is embedded in the inner column. The lower end of the long column extends into the middle sleeve, and one end of the middle sleeve embedded in the inner cavity of the inner column abuts against the upper end of the piston, so that the piston is fixed in the inner cavity of the inner column.

[0019] Furthermore, the middle sleeve includes an outer sleeve and an inner sleeve, the inner sleeve is located inside the outer sleeve, the long column extends into the inner sleeve, the piston rod extends into the inner sleeve, the inner sleeve is embedded in the upper end of the piston seat, and is located between the piston rod and the piston seat.

[0020] Furthermore, one end of the pressure cap passes through the through hole at the top of the outer cover and extends into the inner cavity of the outer cover, and the end of the pressure cap extending into the inner cavity of the outer cover is connected to the large snap fastener.

[0021] The beneficial effects of this invention are as follows: Unlike traditional methods, this invention eliminates the need for springs to support the sealing components, thus extending the spring's lifespan. Furthermore, it effectively limits the spring's position in the circumferential direction, preventing displacement and ensuring its continued usability. By incorporating multiple, elongated fluid channels on the pull rod, a shared channel is avoided, resulting in denser foam generated as the fluid flows through the mesh. This invention significantly improves the user experience. Attached Figure Description

[0022] Figure 1 A cross-sectional structural diagram of this utility model (spring omitted);

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of some components;

[0025] Figure 4 This is a schematic diagram of the spring structure;

[0026] Figure 5 This is a three-dimensional structural diagram of another part of the component;

[0027] Figure 6 This is a detailed structural diagram;

[0028] Figure 7 A detailed structural diagram taken from another visual angle;

[0029] Figure 8 This is a schematic diagram of the tie rod structure;

[0030] Figure 9 Why is this a schematic diagram of the cylinder's structure?

[0031] Figure 10 This is a schematic diagram of the piston structure;

[0032] Figure 11 This is a schematic diagram of the middle sleeve structure;

[0033] Figure 12 This is a schematic diagram of the valve structure;

[0034] In the diagram, 1-compression cap, 2-mesh screen, 3-large flap, 4-blade, 5-outer cover, 6-small flap, 61-limiting block, 7-middle sleeve, 71-outer shell sleeve, 72-inner shell sleeve, 8-sealing sleeve, 9-valve, 91-moving part, 92-connecting part, 10-straw, 11-mesh cylinder, 111-limiting plate, 12-piston, 121-piston seat, 122-piston rod, 13-pull rod, 131-liquid flow channel, 14-locking strip, 15-spring, 151-spring head, 152-spring part, 153-spring bottom, 1531-groove. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0036] like Figures 1-12 As shown, this embodiment provides a novel foam pump, including a pressure cap 1, a mesh screen 2, a large flap 3, an outer cover 5, a thin flap 6, a middle sleeve 7, a piston 12, a spring 15, a cylinder 11, a pull rod 13, a valve 9, and a suction tube 10. One end of the pressure cap 1 passes through a through hole at the upper end of the outer cover 5 and extends into the inner cavity of the outer cover 5. The end of the pressure cap 1 extending into the inner cavity of the outer cover 5 is snapped together with the upper end of the large flap 3, thereby allowing the pressure cap 1 to be detached from the large flap 3. The pressure cap 1 is located between the upper end of the large flap 3 and the outer cover 5. The upper end of the large flap 3 is connected to the mesh screen 2, and the mesh screen 2 is fixed in the inner cavity of the pressure cap 1. The lower end of the large flap 3 abuts against the inner wall of the mesh screen 2, and the large flap 3 can slide up and down along the axial direction (i.e., the vertical direction) of the cylinder 11 and the mesh screen 2.

[0037] Among them, blades 4 are also provided between the large blade 3 and the small blade 6. The purpose of blades 4 is to ensure the internal and external flow of gas in order to balance the internal and external air pressure.

[0038] A notch is provided at the lower center of the large paddle 3. The upper end of the long column (not shown in the figure) mounted on the thin paddle 6 is fixed in the notch and fixedly connected to the large paddle 3, and the large paddle 3 can rotate relative to the long column. That is, while the large paddle 3 is fixedly connected to the long column in the vertical direction, the large paddle 3 can rotate in the circumferential direction of the long column. A spring 15 is sleeved on the thin paddle 6. The upper end of the spring 15 abuts against or is spaced apart from the circumferential groove 1531 (not shown in the figure) at the upper end of the long column. The circumferential groove 1531 is located at the upper end of the long column near the notch. The lower end of the spring 15 is sleeved on the inner column (not shown in the figure) inside the nut cylinder 11 and abuts against the bottom of the nut cylinder 11. The inner column is fixed in the inner cavity of the nut cylinder 11.

[0039] For example, the spring 15 includes a spring head 151, a spring portion 152, and a spring bottom 153 connected in sequence. The spring head 151 has an uneven structure along its circumferential outer edge to facilitate picking up the spring 15. The spring portion 152 has a continuous structure, with one end connected to the spring head 151 and the other end extending continuously until it connects to the spring bottom 153. The spring bottom 153 has a plurality of grooves 1531 along its circumferential outer edge, and the grooves 1531 are spaced apart.

[0040] In order to better assemble the spring 15 and prevent the spring 15 from shifting arbitrarily in the front-back or left-right directions, a number of limiting blocks 61 are provided on the edge of the circumferential groove 1531 on the thin plate 6. The limiting blocks 61 are distributed at intervals. The limiting blocks 61 can be used to limit the spring 15, so that after the spring 15 is sleeved on the long column, it can only move within the space limited by the limiting blocks 61 in the circumferential direction, thereby limiting the spring 15, preventing the spring 15 from shifting arbitrarily, and ensuring the normal use of the spring 15.

[0041] For example, to better secure the spring 15, a plurality of limiting plates 111 are provided on the outer side of the inner column, with each limiting plate 111 spaced around the inner column. When the spring 15 is sleeved on the inner column and the spring 15 is pressed, the limiting plates 111 act as guides for the spring 15 to prevent tilting during use, thereby further enhancing the stability of the spring 15 sleeved on the inner column and preventing the spring 15 from moving arbitrarily in the circumferential direction (i.e., front-back and left-right directions) and avoiding tilting of the spring.

[0042] Before the pressure cap 1 is pressed, the spring 15, which is fitted onto the long column and the inner column, is in a free state without any force. That is, the spring 15 does not deform because it is not under any force. At this time, the spring 15 is not subjected to compressive force and does not deform, regardless of whether it is in contact with the long column or the cylinder 11. Of course, in actual use, the spring 15 can also be fitted onto the inner column only.

[0043] A through cavity is provided inside the long cylinder, and the through cavity is arranged along the axial direction of the long cylinder. The pull rod 13 is embedded in the through cavity, with the upper end of the pull rod 13 extending out of the through cavity and communicating with the mesh 2. The lower end of the mesh 2 extends into the through cavity. The lower end of the long cylinder extends into the inner cavity of the inner cylinder, and the piston 12 can slide along the axial direction of the long cylinder, that is, the piston 12 can slide along the axial direction of the piston rod 122. The upper end of the piston 12 also extends into the inner cavity of the inner cylinder, so that the piston 12 communicates with the long cylinder, and thus the piston 12 communicates with the pull rod 13. A middle sleeve 7 is fixedly installed at the upper end of the inner column. The middle sleeve 7 is embedded in the inner column, and the lower end of the long column extends into the middle sleeve 7. One end of the middle sleeve 7 embedded in the inner cavity of the inner column abuts against the upper end of the piston 12. The piston 12 is fixed in the inner cavity of the inner column. The piston 12 can be fixed to the inner column by tightening and sealing against the inner wall of the inner column. The piston 12 and the inner wall of the inner column always maintain a sealed contact. The liquid in the inner column cavity flows into the inner cavity of the piston 12 through the through hole on the piston 12. The liquid moves upward along the inner cavity of the piston 12 and flows into the pull rod 13. The liquid moves upward along the pull rod 13 and finally flows out from the pressure cap 1.

[0044] For example, to ensure a denser foam flow, the surface of the pull rod 13 is provided with several liquid flow channels 131. These channels 131 are arranged along the axial direction of the pull rod 13, and are spaced apart and distributed around the circumference of the pull rod 13. Through the liquid flow channels 131, liquids that would otherwise share a single channel can flow through smaller channels, allowing the liquid to flow into the mesh 2 in a capillary-like stream, thus producing a denser foam and improving the user experience.

[0045] For example, to facilitate the installation of piston 12, piston 12 includes piston seat 121 and piston rod 122. Piston rod 122 and piston seat 121 are fixedly connected. Piston rod 122 is provided with through hole and through cavity. Through hole and through cavity are connected. Through hole is arranged radially along piston rod 122. Through cavity is arranged axially along piston rod 122. Liquid can flow into through cavity in piston rod 122 through through hole, and then flow into liquid flow groove 131 of pull rod 13 through through cavity, so that liquid flows into mesh 2 and generates foam before flowing out from pressure cap 1.

[0046] For example, in order to ensure the sealing of the connection between the long column and the piston 12, the middle sleeve 7 includes an outer sleeve 71 and an inner sleeve 72. The inner sleeve 72 is located inside the outer sleeve 71, the long column extends into the inner sleeve 72, the piston rod 122 extends into the inner sleeve 72, the inner sleeve 72 is embedded in the upper end of the piston seat 121, and is located between the piston rod 122 and the piston seat 121. The inner sleeve 72 can better prevent water leakage and ensure the sealing effect, so that liquid can enter the through cavity of the piston rod 122 from the through hole of the piston rod 122.

[0047] For example, it also includes a sealing sleeve 8, which is fitted onto the piston 12. The upper end of the sealing sleeve 8 seals against the lower edge of the inner shell sleeve 72 of the middle sleeve 7, and the lower end of the sealing sleeve 8 abuts against the piston seat 121. The sealing sleeve 8 can further enhance the sealing performance and prevent liquid from flowing out of the piston 12.

[0048] The lower end of the tube 11 is connected to the straw 10. A valve 9 is provided at the connection between the tube 11 and the straw 10. The valve 9 is used to prevent the liquid sucked in by the straw 10 from entering the inner cavity of the inner column under normal circumstances. In other words, the valve 9 is used to control whether the liquid flows into the inner cavity of the inner column, thereby controlling whether the liquid is squeezed out.

[0049] For example, to ensure better sealing and control over whether liquid is squeezed out, this embodiment abandons the use of spherical glass beads in traditional foam pumps and instead uses valve 9. Valve 9 includes a valve body (not shown in the figure), a movable part 91 and several connecting parts 92 disposed on the valve body. One end of each connecting part 92 is connected to the movable part 91 and to the valve body. The connecting parts 92 are distributed around the movable part 91, and the movable part 91 can move relative to the connecting parts 92, thereby causing the movable part 91 to protrude to a first position and a second position.

[0050] First position: The end faces of the movable part 91, the connecting part 92 and the valve body 9 are flush, that is, on the same plane, so that the movable part 91 seals against the junction of the valve 9 and the tube 11, thereby making the straw 10 and the tube 11 a sealed connection, and the liquid cannot flow into the tube 11.

[0051] Second position: The movable part 91 protrudes from the end face of the connecting part 92 and the main body of the valve 9. The movable part 91 is disengaged from the junction of the valve 9 and the tube 11, so that the straw 10 and the tube 11 are connected again, and the liquid can flow into the tube 11.

[0052] The movable part 91 has a flat structure. Compared with the spherical glass beads, the movable part 91 can completely cover the joint between the valve 9 and the cylinder 11, thus providing better sealing.

[0053] For example, a step is provided in the middle of the inner cavity of the inner column of the tube 11, and the valve 9 is located on the step. When the movable part 91 is in the first position, the movable part 91 abuts against the step to seal the connection between the straw 10 and the tube 11. When the movable part 91 is in the second position, the movable part 91 disengages from the step, so that the straw 10 and the tube 11 become connected.

[0054] In practical applications, during transportation or placement on shelves, the foam pump is fixed inside the container bottle via the outer cap 5, for example, in commonly used bottled shower gel. The straw 10 extends into the liquid inside the container bottle. Before the consumer uses it, by pulling the cap 1 upward a short distance and then rotating it, the cap 1 is moved into the appropriate position. At this point, the cap 1 cannot rotate relative to the outer cap 5. Under external force, the cap 1 moves downward a short distance, which in turn causes the large lever 3 to move the long column downward a short distance. The long column then moves the pull rod 13 downward a short distance, causing the pull rod 13 to seal against the piston 12. This prevents the liquid from flowing out of the piston 12 and into the pull rod 13, thus preventing the liquid from ultimately flowing out of the cap 1. This ensures that no liquid is accidentally squeezed out before the consumer opens and uses the product, including during transportation or placement on shelves. Furthermore, while preventing accidental liquid squeezing, the spring 15 remains in a normal state, neither stretched nor compressed, and is completely in a state without deformation, thus not affecting the service life of the spring 15.

[0055] The pressure cap 1 is connected to the outer cover 5 by a locking pin, so that the pressure cap 1 can be rotated to the corresponding position.

[0056] This invention prevents liquid from being squeezed out by locking the cap 1 and changing the connection between the long column and the inner column from a connected state to a sealed state. The spring 15 is in a normal, undeformed state, which not only ensures the protection against accidental liquid leakage but also guarantees the service life of the spring 15, thereby improving product competitiveness and user experience.

[0057] In addition, the spring 15 is limited by the limiting block 61 on the fine tap 6 and the limiting plate 111 on the inner column, so as to limit the spring 15 in the circumferential direction, thereby preventing the spring 15 from deviating, ensuring the normal use of the spring 15, and improving the user experience.

[0058] This invention eliminates the need for a spring 15 to support the sealing components and achieve a seal, as is the case with traditional methods, thus extending the lifespan of the spring 15. Furthermore, it effectively limits the circumferential movement of the spring 15, preventing displacement and ensuring its usability. By incorporating multiple slender fluid channels 131 on the pull rod 13, a shared channel is avoided, resulting in denser foam generated by the flow through the mesh 2. This invention significantly improves the user experience.

[0059] The embodiments disclosed in this specification are merely illustrative of one aspect of the present invention, and the scope of protection of the present invention is not limited to this embodiment. Any other functionally equivalent embodiments fall within the scope of protection of the present 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 the present invention.

Claims

1. A novel foam pump, characterized in that, The device includes a pressure cap, a mesh screen, a large paddle, an outer cap, a small paddle, a middle sleeve, a spring, a cylinder, a piston, a pull rod, a valve, and a suction tube. The pressure cap passes through the outer cap and connects to the large paddle located inside the pressure cap. The outer cap is mounted on the pressure cap. The upper end of the large paddle connects to the mesh screen, which is fixed within the inner cavity of the pressure cap. The cylinder includes an inner post. The lower end of the large paddle connects to the small paddle, which also extends into the inner cavity of the inner post. The spring is sleeved on the small paddle. The upper end of the spring abuts against or is spaced apart from a circumferential groove at the upper end of a long column. The circumferential groove is located near a notch at the upper end of the long column. The lower end of the spring is sleeved on the inner post inside the cylinder, which is fixed within the inner cavity of the cylinder. The piston is mounted on the inner column, with its upper end extending into the cavity of the middle sleeve and the lower end of the thin plate extending into the cavity of the middle sleeve. The piston is connected to a pull rod, which is located within the cavity of the thin plate. The lower end of the piston extends into the inner cavity of the inner column, and the pull rod is connected to the mesh. The valve is installed in the inner cavity of the inner column, and the inner cavity is also connected to the straw. The valve is located between the straw and the fine tap. The pull rod is provided with several fluid flow channels, which are arranged along the axial direction of the pull rod and are respectively connected to the piston and the mesh.

2. The novel foam pump according to claim 1, characterized in that, The spring includes a spring head, a spring part, and a spring bottom connected in sequence. The spring head has an uneven structure along its circumferential outer edge. The spring part has a continuous structure, with one end connected to the spring head and the other end extending continuously until it connects to the spring bottom. The spring bottom has several grooves along its circumferential outer edge, with each groove spaced apart.

3. The novel foam pump according to claim 2, characterized in that, The edge of the circumferential groove on the thin plate is provided with several limiting blocks, which are distributed at intervals. The limiting blocks can be used to limit the spring.

4. The novel foam pump according to claim 3, characterized in that, Several limiting plates are provided on the outer side of the inner column, and each limiting plate is arranged at intervals around the inner column.

5. The novel foam pump according to claim 1, characterized in that, The piston includes a piston seat and a piston rod, which are fixedly connected. The piston rod is provided with a through hole and a through cavity, which are connected in communication. The through hole is arranged radially along the piston rod, and the through cavity is arranged axially along the piston rod. Liquid can flow into the through cavity in the piston rod through the through hole, and then flow into the liquid flow groove of the pull rod through the through cavity.

6. The novel foam pump according to claim 5, characterized in that, The valve includes a valve body, a movable part and several connecting parts disposed on the valve body. One end of each connecting part is connected to the movable part and to the valve body. The connecting parts are arranged around the movable part, and the movable part can move relative to the connecting parts, thereby causing the movable part to protrude to a first position and a second position. First position: The end faces of the moving part, connecting part, and valve body are flush, so that the moving part seals against the joint between the valve and the cylinder, thereby making the suction tube and the cylinder a sealed connection. Second position: The movable part protrudes from the end face of the connecting part and the valve body. The movable part is separated from the joint between the valve and the cylinder, so that the straw and the cylinder become connected again.

7. The novel foam pump according to claim 6, characterized in that, The inner cavity of the inner column of the tube has a step in the middle, and the valve is located on the step. When the movable part is in the first position, the movable part abuts against the step to seal the connection between the straw and the tube. When the movable part is in the second position, the movable part disengages from the step, so that the straw and the tube become connected.

8. The novel foam pump according to claim 1, characterized in that, A through cavity is provided inside the long column, and the through cavity is arranged along the axial direction of the long column. The pull rod is embedded in the through cavity, the upper end of the pull rod extends out of the through cavity and is connected to the mesh, and the lower end of the mesh extends into the through cavity. The lower end of the long column extends into the inner cavity of the inner column, and the piston can slide along the axial direction of the piston rod. The upper end of the piston also extends into the inner cavity of the inner column, so that the piston is connected to the long column, and thus the piston is connected to the pull rod. A middle sleeve is fixedly provided at the upper end of the inner column, and the middle sleeve is embedded in the inner column. The lower end of the long column extends into the middle sleeve, and one end of the middle sleeve embedded in the inner cavity of the inner column abuts against the upper end of the piston. The piston is fixed in the inner cavity of the inner column.

9. The novel foam pump according to claim 8, characterized in that, The middle sleeve includes an outer sleeve and an inner sleeve. The inner sleeve is located inside the outer sleeve. The long column extends into the inner sleeve. The piston rod extends into the inner sleeve. The inner sleeve is embedded in the upper end of the piston seat and is located between the piston rod and the piston seat.

10. The novel foam pump according to claim 1, characterized in that, One end of the pressure cap passes through the through hole at the top of the outer cover and extends into the inner cavity of the outer cover, and the end of the pressure cap extending into the inner cavity of the outer cover is connected to the large snap fastener.

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