Elastomeric toothpaste pump

Abstract

The present invention relates to an elastomeric toothpaste pump, which comprises a button, a discharge pipe, a sealing seat, an elastomer, a discharge cylinder, an upper one-way valve and a lower one-way valve; the elastomer mainly consists of an inner cylinder, a first connecting ring, a middle cylinder and an umbrella body. Both ends of the inner cylinder and the middle cylinder are open. The inner cylinder is located inside the middle cylinder, and their upper ends are flush and connected to each other through the first connecting ring. The lower end of the middle cylinder is connected to the small end of the umbrella body; the discharge cylinder is only open at one end, and the open end of the discharge cylinder is inserted between the inner cylinder and the middle cylinder of the elastomer. The discharge cylinder is fixedly connected to the elastomer, and a discharge through hole is provided on the closed end of the discharge cylinder; the button is located above the elastomer; the discharge pipe is inserted into the inner cylinder of the elastomer, and the two are in interference sealing fit; the sealing seat is located below the discharge cylinder, and a feed through hole is provided thereon; the upper one-way valve is installed on the discharge through hole of the discharge cylinder; the lower one-way valve is installed on the feed through hole of the sealing seat. The elastomeric toothpaste pump of the present invention has a simple structure and is convenient to use.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum pumps and relates to an elastomeric toothpaste pump. Background Art

[0002] With the development of society, people's material life has been greatly enriched. People not only pursue product quality but also put forward higher requirements for the appearance packaging of products, especially the packaging of daily necessities. Its appearance packaging is no longer just a simple container but must also take into account the beautiful shape and the convenience of use. Squeezing or pressing type packaging bottles for discharging materials stand out in the packaging of daily necessities due to their convenient use and beautiful shape.

[0003] Patent CN105923281A discloses a self-priming pump pressure type packaging bottle, which discloses the discharging principle of a general pressing type discharging packaging bottle. After the paste is extruded from the discharging pipe, the upper end opening of the discharging pipe is closed by a pressing member, and the paste forms a vacuum in the discharging pipe by hanging on the wall of the discharging pipe to block the discharging pipe, so as to facilitate the smooth extrusion of the paste when used again. If the paste cannot hang on the wall, sealing cannot be achieved, and paste breakage will occur when used again, and normal discharging cannot be realized. The pump heads of the existing pressing type discharging packaging bottles are only a simple discharging pipe. Although the structure is simple and the cost is low, when the release button is pressed to close the packaging bottle, the paste will flow down under the action of gravity. As the use time prolongs, the seal at the lower part of the discharging pipe gradually fails, and the paste cannot be completely kept in the discharging pipe. It is necessary to press multiple times during use to ensure the extrusion of the paste, which seriously affects the use effect of the packaging bottle.

[0004] Therefore, it is of great practical significance to develop an elastomeric toothpaste pump that can block the backflow of the paste and enhance the sealing effect. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide an elastomeric toothpaste pump.

[0006] To achieve the above purpose, the following scheme is adopted in the present invention:

[0007] The elastomeric toothpaste pump includes a button, a discharging pipe and a sealing seat, and also includes an elastomer (i.e., a component made entirely of elastic material), a discharging cylinder, an upper one-way valve and a lower one-way valve;

[0008] The elastomer is mainly composed of an inner cylinder, a first connecting ring, a middle cylinder and an umbrella body. Both ends of the inner cylinder and the middle cylinder are open. The inner cylinder is located inside the middle cylinder, and their upper ends are flush and are connected to each other through the first connecting ring. The lower end of the middle cylinder is connected to the small end of the umbrella body. The small end of the umbrella body is the end with a smaller size of the umbrella body. Multiple rib strips can be arranged around the small end of the umbrella body to improve the structural strength of the umbrella body;

[0009] The discharge cylinder has an opening only at one end. The opening end of the discharge cylinder is inserted between the inner cylinder and the middle cylinder of the elastomer. The discharge cylinder is fixedly connected to the elastomer, and a discharge through-hole is provided on the closed end of the discharge cylinder.

[0010] The button is located above the elastomer and is used to drive the elastomer to move downward. The discharge pipe is inserted into the inner cylinder of the elastomer, and the two are in interference sealing fit. The sealing seat is located below the discharge cylinder, and a feed through-hole is provided thereon.

[0011] The upper one-way valve is installed on the discharge through-hole of the discharge cylinder and is used to unidirectionally connect the spaces on the upper and lower sides of the closed end of the discharge cylinder. The lower one-way valve is installed on the feed through-hole of the sealing seat and is used to unidirectionally connect the spaces on the upper and lower sides of the sealing seat. All unidirectional connections mean that the filler can only flow from bottom to top.

[0012] The operation process of the elastomer type toothpaste pump of the present invention is as follows: In the natural state, the upper one-way valve and the lower one-way valve are closed. The nozzle of the discharge pipe and the discharge through-hole of the discharge cylinder are sealed by the upper one-way valve, and the feed through-hole of the sealing seat is sealed by the lower one-way valve. When a downward force is applied to the button, the elastomer deforms under the action of the button, driving the discharge cylinder to move downward. The nozzle of the discharge pipe opens, and the pressure in the space between the discharge cylinder and the sealing seat increases. The upper one-way valve opens, and the filler between the discharge cylinder and the sealing seat is extruded from the discharge through-hole of the discharge cylinder, enters the cavity formed by the discharge pipe and the discharge cylinder, and is extruded from the discharge pipe. During this process, the feed through-hole of the sealing seat is always sealed by the lower one-way valve. When the force applied to the button is removed, the elastomer recovers its deformation, driving the discharge cylinder to move upward. At the same time, the button resets, the nozzle of the discharge pipe and the upper one-way valve close, the pressure in the space between the discharge cylinder and the sealing seat decreases, the lower one-way valve opens, and the filler below the sealing seat is extruded from the feed through-hole of the sealing seat and enters the space between the discharge cylinder and the sealing seat. When the pressures on the upper and lower sides of the sealing seat are equal, the lower one-way valve closes.

[0013] As a preferred solution:

[0014] For the elastomer type toothpaste pump as described above, the opening end of the discharge cylinder is directly inserted between the inner cylinder and the middle cylinder of the elastomer. The fixed connection structure between the discharge cylinder and the elastomer is as follows: annular protrusions a are provided on the inner side wall and the outer side wall of the discharge cylinder, and annular grooves d are provided on the outer side wall of the inner cylinder and the inner side wall of the middle cylinder. The annular protrusions a are embedded in the annular grooves d.

[0015] For the elastomeric toothpaste pump as described above, the open end of the discharge tube is indirectly inserted between the inner cylinder and the middle cylinder of the elastomer. Specifically, an additional cylinder is provided between the inner cylinder and the middle cylinder of the elastomer. The additional cylinder has openings at both ends and is flush with the upper end of the inner cylinder. The open end of the discharge tube is inserted between the middle cylinder and the additional cylinder of the elastomer. The fixed connection structure between the discharge tube and the elastomer is as follows: annular protrusions b are provided on the inner side wall and the outer side wall of the discharge tube, and annular grooves e are provided on the outer side wall of the additional cylinder and the inner side wall of the middle cylinder. The annular protrusions b are embedded in the annular grooves e.

[0016] For the elastomeric toothpaste pump as described above, the interference fit and sealing between the discharge pipe and the inner cylinder of the elastomer are achieved by providing a plurality of annular protrusions c on the inner side wall of the inner cylinder of the elastomer.

[0017] For the elastomeric toothpaste pump as described above, the interference fit and sealing between the discharge pipe and the inner cylinder of the elastomer are achieved by sleeving a sealing member on the discharge pipe. The sealing member is composed of a cylindrical cylinder and a frustum-shaped cylinder. The cylindrical cylinder and the frustum-shaped cylinder have openings at both ends. The upper end of the cylindrical cylinder is fixedly connected to the discharge pipe, and the lower end is fixedly connected to the small end of the lower end of the frustum-shaped cylinder. The large end of the upper end of the frustum-shaped cylinder is in interference fit and sealing with the inner side wall of the inner cylinder.

[0018] For the elastomeric toothpaste pump as described above, the large end of the umbrella body of the elastomer is in interference fit with the sealing seat;

[0019] The upper one-way valve is an elastic sealing sheet or a flip valve, and the lower one-way valve is an elastic sealing sheet;

[0020] The elastic sealing sheet is composed of an annular ring, a sealing sheet located in the middle of the annular ring, and connecting strips connecting the annular ring and the sealing sheet; the elastic sealing sheet is an integrally formed part. The thickness of the sealing sheet is less than the thickness of the annular ring. The specific shapes and dimensions of the annular ring, the sealing sheet, and the connecting strips are not limited. For example, the solid cross-section of the annular ring can be rectangular, the sealing sheet can be a circular sheet, the connecting strips can be arc-shaped strips, the arc radius of which is 2-5 mm larger than the circular radius of the sealing sheet, and the connection between the connecting strip and the sealing sheet is a bend; the flip valve is composed of a cover member and an elastic connecting strip; the flip valve is a valve that relies on the flipping of the cover member to open and close the valve during use.

[0021] When the upper one-way valve is an elastic sealing sheet, its annular ring is a part of the inner cylinder of the elastomer, or is integrally formed with the inner cylinder of the elastomer, and its sealing sheet covers the discharge through hole of the discharge barrel; when the upper one-way valve is a folding valve, its cover is a spherical segment structure and is embedded in the discharge through hole of the discharge barrel. The spherical segment structure of the cover is conducive to ensuring that the discharge through hole can be completely closed when the covering direction of the cover changes. One end of its elastic connecting strip is connected to the cover, and the other end is connected to the inner cylinder of the elastomer. The number of elastic connecting strips is not limited, as long as the connection between the cover and the inner cylinder of the elastomer can be achieved and the folding of the cover is not affected. Since the elastic connecting strip and the elastomer are both made of elastic materials, the upper one-way valve and the elastomer can be integrally formed, which is conducive to simplifying the process;

[0022] The sealing seat is provided with an annular concave step, the annular ring of the lower one-way valve is fixed in the annular concave step of the sealing seat, and the sealing piece of the lower one-way valve covers the feed through hole of the sealing seat.

[0023] The elastic toothpaste pump as described above further comprises a first support cylinder, a second support cylinder, a piston, a storage cylinder and a third connecting ring;

[0024] Both ends of the first support tube and the second support tube are open, the first support tube is sleeved in the second support tube, the lower ends of the two are flush and connected to the sealing seat at the same time; the elastic body also includes a second connecting ring and an outer tube, the umbrella body is sleeved in the outer tube, and the two are connected to each other through the second connecting ring; the outer tube of the elastic body is inserted between the first support tube and the second support tube, and the first support tube is inserted between the umbrella body and the outer tube of the elastic body;

[0025] The storage barrel is open at both ends; the closed end of the discharge barrel and the part close to the closed end are fixed in the piston through a third connecting ring; the piston is located in the storage barrel and has an interference seal with the storage barrel; the storage barrel is located in the first supporting barrel; the sealing seat is located below the storage barrel, and the two are fixedly connected.

[0026] In the elastic toothpaste pump as described above, the upper one-way valve and the lower one-way valve are both mushroom nails, or the upper one-way valve and the lower one-way valve are both elastic sealing sheets, or the upper one-way valve and the lower one-way valve are respectively mushroom nails and elastic sealing sheets, or the upper one-way valve and the lower one-way valve are respectively elastic sealing sheets and mushroom nails;

[0027] The mushroom nail is a mushroom-shaped structure, including a cover body and a handle body connected to the cover body. The cover body is an elastic sheet, and the edge will bend toward the n side after receiving the impact force from the m side. The m side and the n side are two opposite sides, and the m side is the side where the handle body is located.

[0028] The elastic sealing sheet is composed of an annular ring, a sealing sheet located in the middle of the annular ring, and a connecting strip connecting the annular ring and the sealing sheet;

[0029] When the upper one-way valve or the lower one-way valve is a mushroom pin, a central through-hole and more than one surrounding through-hole close to the central through-hole are provided on the closed end or the sealing seat of the discharge cylinder. The number, distribution pattern and shape of the surrounding through-holes are not limited. For example, the number of the surrounding through-holes is multiple and they are evenly distributed around the circumference of the central through-hole. The shape of the surrounding through-hole is fan-shaped. The surrounding through-holes on the closed end or the sealing seat of the discharge cylinder are the discharge through-holes or the feed through-holes. The shank of the mushroom pin is inserted into the central through-hole on the closed end or the sealing seat of the discharge cylinder and is fixedly connected to the closed end or the sealing seat of the discharge cylinder. The cap of the mushroom pin is located above the closed end or the sealing seat of the discharge cylinder, and its lower surface is used to cover and seal the surrounding through-holes on the closed end or the sealing seat of the discharge cylinder.

[0030] When the upper one-way valve or the lower one-way valve is an elastic sealing sheet, an annular concave step surrounding the discharge through-hole or the feed through-hole is provided on the closed end or the sealing seat of the discharge cylinder. The annular ring of the elastic sealing sheet is fixed in the annular concave step on the closed end or the sealing seat of the discharge cylinder, and the sealing sheet covers the discharge through-hole at the closed end of the discharge cylinder or the feed through-hole of the sealing seat.

[0031] For the elastomeric toothpaste pump as described above, when the upper one-way valve is a mushroom pin, the upper surface of the cap of the mushroom pin is used to cover and seal the nozzle of the discharge tube, and it has a spherical segment structure, which is beneficial to ensuring complete sealing of the nozzle of the discharge tube even when the closing direction of the cap changes.

[0032] For the elastomeric toothpaste pump as described above, the thickness of the cap of the mushroom pin decreases from the center to the edge, and the thickness is less than 1 mm. The shank of the mushroom pin is composed of a connecting cylinder, a transition cylinder and a cone that are sequentially coaxially connected. The connecting cylinder is connected to the cap of the mushroom pin. The diameter of the transition cylinder is larger than that of the connecting cylinder and is equal to the bottom diameter of the cone.

[0033] Advantageous effects:

[0034] The elastomeric toothpaste pump of the present invention has a simple structure and is convenient to use. It can also be applied to other pastes or semi-fluids besides toothpaste, and can block the backflow of the paste and enhance the sealing effect. Description of the drawings

[0035] Figure 1 It is a schematic structural diagram of the elastomeric toothpaste pump of Embodiment 1;

[0036] Figures 2 - 3 It is a schematic structural diagram of the elastomer of the elastomeric toothpaste pump of Embodiment 1;

[0037] Figures 4 - 5 It is a schematic connection structure diagram of the discharge cylinder and the piston of the elastomeric toothpaste pump of Embodiment 1;

[0038] Figures 6 - 7 It is a schematic structural diagram of the upper one-way valve of the elastomeric toothpaste pump of Embodiment 1;

[0039] Figures 8 - 9 Schematic structural diagram of the lower one-way valve of the elastomeric toothpaste pump of Example 1;

[0040] Figure 10 Schematic structural diagram of the connection structure between the sealing seat and the lower one-way valve of the elastomeric toothpaste pump of Example 1;

[0041] Figures 11 - 12 Schematic structural diagram of the button of the elastomeric toothpaste pump of Example 1;

[0042] Figures 13 - 14 Schematic structural diagram of the housing of the elastomeric toothpaste pump of Example 1;

[0043] Figures 15 - 16 Schematic structural diagram of the bottle body of the packaging bottle;

[0044] Figures 17 - 18 Schematic structural diagram of the piston in the bottle body of the packaging bottle;

[0045] Figures 19 - 20 Schematic structural diagram of the bottle cap of the packaging bottle;

[0046] Figures 21 - 22 Schematic structural diagram of the packaging bottle containing the elastomeric toothpaste pump of Example 1;

[0047] Figure 23 Schematic structural diagram of the packaging bottle containing the elastomeric toothpaste pump of Example 2;

[0048] Figure 24 Schematic structural diagram of the packaging bottle containing the elastomeric toothpaste pump of Example 3;

[0049] Figure 25 Schematic structural diagram of the packaging bottle containing the elastomeric toothpaste pump of Example 4;

[0050] Figure 26 Schematic structural diagram of the packaging bottle containing the elastomeric toothpaste pump of Example 5;

[0051] Figures 27 - 28 Schematic structural diagram of the connection structure between the elastomer and the upper one-way valve of the elastomeric toothpaste pump of Example 5;

[0052] Figures 29 - 30 Schematic structural diagram of the discharge cylinder of the elastomeric toothpaste pump of Example 5;

[0053] Among them, 1 - button, 2 - discharge pipe, 3 - sealing seat, 3.1 - annular concave step, 4 - feed through hole, 5 - elastomer, 5.1 - inner cylinder, 5.2 - first connecting ring, 5.3 - middle cylinder, 5.4 - additional cylinder, 5.5 - umbrella body, 5.6 - second connecting ring, 5.7 - outer cylinder, 6 - discharge cylinder, 7 - discharge through hole, 8 - upper one - way valve, 9 - lower one - way valve, 10 - annular protrusion b, 11 - annular groove e, 12 - annular protrusion c, 13 - first support cylinder, 14 - second support cylinder, 15 - piston, 16 - storage cylinder, 17 - third connecting ring, 18 - central through hole, 19 - surrounding through hole, 20 - cover body, 21 - handle body, 21.1 - connecting cylinder, 21.2 - transition cylinder, 21.3 - cone, 22 - annular ring, 23 - sealing piece, 24 - connecting strip. Detailed implementation manners

[0054] The present invention will be further described below in conjunction with specific implementation manners. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0056] The terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] Embodiment 1

[0059] The elastomer - type toothpaste pump, as Figure 1 shown, includes a housing as Figures 13 - 14 shown, asFigures 11 - 12 The key 1, the discharge pipe 2, the sealing seat 3, the elastic body 5, the discharge cylinder 6, the upper one-way valve 8, and the lower one-way valve 9 shown;

[0060] As Figures 2 - 3 shown, the elastic body 5 is mainly composed of an inner cylinder 5.1, a first connecting ring 5.2, a middle cylinder 5.3, and an umbrella body 5.5. Both ends of the inner cylinder 5.1 and the middle cylinder 5.3 are open. The inner cylinder 5.1 is located inside the middle cylinder 5.3, and their upper ends are flush and are connected to each other through the first connecting ring 5.2. The lower end of the middle cylinder 5.3 is connected to the small end of the umbrella body 5.5. The small end of the umbrella body 5.5 is the end with a smaller size of the umbrella body 5.5. Multiple rib strips can be provided around the small end of the umbrella body 5.5 to improve the structural strength of the umbrella body 5.5;

[0061] The discharge cylinder 6 has an opening at only one end. The discharge cylinder 6 is fixedly connected to the elastic body 5, and a discharge through hole 7 is provided on the closed end of the discharge cylinder 6;

[0062] The open end of the discharge cylinder 6 is directly inserted between the inner cylinder 5.1 and the middle cylinder 5.3 of the elastic body 5. The fixed connection structure between the discharge cylinder 6 and the elastic body 5 is as follows: annular protrusions a are provided on the inner side wall and the outer side wall of the discharge cylinder 6, and annular grooves d are provided on the outer side wall of the inner cylinder 5.1 and the inner side wall of the middle cylinder 5.3, and the annular protrusions a are embedded in the annular grooves d; or, the open end of the discharge cylinder 6 is indirectly inserted between the inner cylinder 5.1 and the middle cylinder 5.3 of the elastic body 5. Specifically, an additional cylinder 5.4 is further provided between the inner cylinder 5.1 and the middle cylinder 5.3 of the elastic body 5. Both ends of the additional cylinder 5.4 are open and are flush with the upper end of the inner cylinder 5.1. The open end of the discharge cylinder 6 is inserted between the middle cylinder 5.3 and the additional cylinder 5.4 of the elastic body 5. The fixed connection structure between the discharge cylinder 6 and the elastic body 5 is as follows: annular protrusions b 10 are provided on the inner side wall and the outer side wall of the discharge cylinder 6, and annular grooves e 11 are provided on the outer side wall of the additional cylinder 5.4 and the inner side wall of the middle cylinder 5.3, and the annular protrusions b 10 are embedded in the annular grooves e 11;

[0063] The key 1 is located above the elastic body 5 and is used to drive the elastic body 5 to move downward. The discharge pipe 2 is inserted into the inner cylinder 5.1 of the elastic body 5, and the two are in interference sealing fit. Specifically, it is achieved by providing multiple annular protrusions c 12 on the inner side wall of the inner cylinder 5.1 of the elastic body 5, or by sleeving a sealing member on the discharge pipe 2. The sealing member is composed of a cylindrical cylinder and a frustum-shaped cylinder. Both ends of the cylindrical cylinder and the frustum-shaped cylinder are open. The upper end of the cylindrical cylinder is fixedly connected to the discharge pipe 2, and the lower end is fixedly connected to the small end of the lower end of the frustum-shaped cylinder. The large end of the upper end of the frustum-shaped cylinder is in interference sealing fit with the inner side wall of the inner cylinder 5.1; the sealing seat 3 is located below the discharge cylinder 6, and a feed through hole 4 is provided thereon;

[0064] The upper one-way valve 8 is installed on the discharge through-hole 7 of the discharge cylinder 6 for unidirectionally connecting the spaces on the upper and lower sides of the closed end of the discharge cylinder 6; the lower one-way valve 9 is installed on the feed through-hole 4 of the sealing seat 3 for unidirectionally connecting the spaces on the upper and lower sides of the sealing seat 3; all unidirectional connections mean that the filler can only flow from bottom to top;

[0065] It further includes a first support cylinder 13, a second support cylinder 14, a piston 15, a storage cylinder 16 and a third connecting ring 17;

[0066] Both ends of the first support cylinder 13 and the second support cylinder 14 are open. The first support cylinder 13 is sleeved inside the second support cylinder 14, and their lower ends are flush and are simultaneously connected to the sealing seat 3; the elastic body 5 further includes a second connecting ring 5.6 and an outer cylinder 5.7. The umbrella body 5.5 is sleeved inside the outer cylinder 5.7, and the two are connected to each other through the second connecting ring 5.6; the outer cylinder 5.7 of the elastic body 5 is inserted between the first support cylinder 13 and the second support cylinder 14, and the first support cylinder 13 is inserted between the umbrella body 5.5 and the outer cylinder 5.7 of the elastic body 5;

[0067] The storage cylinder 16 is open at both ends; as Figures 4 - 5 shown, the closed end of the discharge cylinder 6 and the part near the closed end are fixed inside the piston 15 through the third connecting ring 17; the piston 15 is located inside the storage cylinder 16 and is in interference sealing fit with the storage cylinder 16; the storage cylinder 16 is located inside the first support cylinder 13; the sealing seat 3 is located below the storage cylinder 16, and the two are fixedly connected;

[0068] As Figures 6 - 9 shown, the upper one-way valve 8 and the lower one-way valve 9 are respectively a mushroom nail and an elastic sealing sheet 23;

[0069] The mushroom nail has a mushroom-like structure, including a cover body 20 and a handle body 21 connecting the cover body 20. The cover body 20 is an elastic sheet, and after being impacted on the m side, the edge will tilt towards the n side. The m side and the n side are opposite sides, and the m side is the side where the handle body 21 is located;

[0070] The cover body 20 of the mushroom nail decreases in thickness from the center to the edge, and the thickness is less than 1 mm; the handle body 21 of the mushroom nail is composed of a connecting cylinder 21.1, a transition cylinder 21.2 and a cone 21.3 connected coaxially in sequence. The connecting cylinder 21.1 is connected to the cover body 20 of the mushroom nail. The diameter of the transition cylinder 21.2 is larger than that of the connecting cylinder 21.1 and is equal to the bottom diameter of the cone 21.3;

[0071] The elastic sealing sheet 23 is composed of an annular ring 22, a sealing piece 23 located in the middle of the annular ring 22 and a connecting strip 24 connecting the annular ring 22 and the sealing piece 23;

[0072] The closed end of the discharge tube 6 is provided with a central through hole 18 and more than one surrounding through hole 19 adjacent to the central through hole 18. The surrounding through hole 19 on the closed end of the discharge tube 6 is the discharge through hole 7. The handle body 21 of the mushroom nail is inserted into the central through hole 18 on the closed end of the discharge tube 6 and fixedly connected to the closed end of the discharge tube 6. The cover body 20 of the mushroom nail is located above the closed end of the discharge tube 6. The lower surface is used to cover and seal the surrounding through hole 19 on the closed end of the discharge tube 6, and the upper surface is used to cover and seal the nozzle of the discharge tube 2, and has a spherical segment structure;

[0073] As Figure 10 shown, the sealing seat 3 is provided with an annular concave step 3.1 around the feed through hole 4. The annular ring 22 of the elastic sealing sheet 23 is fixed in the annular concave step 3.1 on the sealing seat 3, and the sealing piece 23 covers the feed through hole 4 of the sealing seat 3.

[0074] The operation process of the elastomeric toothpaste pump of the present invention is as follows: In the natural state, the nozzle of the discharge tube 2 and the discharge through hole 7 of the discharge tube 6 are sealed by the upper and lower surfaces of the cover body 20 of the mushroom nail, and the feed through hole 4 of the sealing seat 3 is sealed by the sealing piece 23 of the elastic sealing sheet 23; when a downward force is applied to the button 1, under the action of the button 1, the elastomer 5 deforms, driving the discharge tube 6 to move downward, the nozzle of the discharge tube 2 opens, and at the same time the pressure in the space between the discharge tube 6 and the sealing seat 3 increases, the edge of the cover body 20 of the mushroom nail turns up, the discharge through hole 7 of the discharge tube 6 opens, and the filler between the discharge tube 6 and the sealing seat 3 is extruded from the discharge through hole 7 of the discharge tube 6, enters the cavity formed by the discharge tube 2 and the discharge tube 6, and is extruded from the discharge tube 2. During this process, the feed through hole 4 of the sealing seat 3 is always sealed by the sealing piece 23 of the elastic sealing sheet 23; when the force applied to the button 1 is removed, the elastomer 5 returns to its original shape, driving the discharge tube 6 to move upward, the button 1 resets, the cover body 20 of the mushroom nail returns to its original shape, the nozzle of the discharge tube 2 and the discharge through hole 7 of the discharge tube 6 are closed, the pressure in the space between the discharge tube 6 and the sealing seat 3 decreases, the sealing piece 23 of the elastic sealing sheet 23 moves above the feed through hole 4, the feed through hole 4 of the sealing seat 3 opens, and the filler below the sealing seat 3 is extruded from the feed through hole 4 of the sealing seat 3 and enters the space between the discharge tube 6 and the sealing seat 3. When the pressure on both sides of the sealing seat 3 is equal, the sealing piece 23 of the elastic sealing sheet 23 returns to its initial position and covers and seals the feed through hole 4 again.

[0075] The elastomeric toothpaste pump of the present invention can be assembled with a bottle body as Figures 15 - 16 shown, a piston 15 in the bottle body as Figures 17 - 18 shown, and a bottle cap as Figures 19 - 20 shown to form a packaging bottle as Figures 21 - 22 shown. The filler in this packaging bottle is not limited to toothpaste, and other fluids are also applicable.

[0076] The specific application form of the elastomeric toothpaste pump of the present invention is not limited, and as long as the elastomeric toothpaste pump of the present invention is used, it is within the protection scope of the present invention.

[0077] Example 2

[0078] The elastomeric toothpaste pump is basically the same as that in Example 1, except that: the lower one-way valve 9 is a mushroom pin, a central through hole 18 and one or more surrounding through holes 19 close to the central through hole 18 are provided on the sealing seat 3, and the surrounding through hole 19 on the sealing seat 3 is the feed through hole 4. The shank 21 of the mushroom pin is inserted into the central through hole 18 on the sealing seat 3 and is fixedly connected to the sealing seat 3. The cover 20 of the mushroom pin is located above the sealing seat 3, and the lower surface is used to cover and seal the surrounding through hole 19 on the sealing seat 3. The packaging bottle containing the elastomeric toothpaste pump of the present invention is as Figure 23 shown.

[0079] The operation process of the elastomeric toothpaste pump of the present invention is as follows: In the natural state, the nozzle of the discharge pipe 2 and the discharge through hole 7 of the discharge cylinder 6 are sealed by the upper and lower surfaces of the cover 20 of the upper mushroom pin (i.e., the upper one-way valve 8), and the feed through hole 4 of the sealing seat 3 is sealed by the lower surface of the cover 20 of the lower mushroom pin (i.e., the lower one-way valve 9); when a downward force is applied to the button 1, under the action of the button 1, the elastomer 5 deforms, driving the discharge cylinder 6 to move downward, the nozzle of the discharge pipe 2 opens, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 increases, the edge of the cover 20 of the mushroom pin of the upper mushroom pin turns up, the discharge through hole 7 of the discharge cylinder 6 opens, and the filler between the discharge cylinder 6 and the sealing seat 3 is extruded from the discharge through hole 7 of the discharge cylinder 6, enters the discharge pipe 2 through the cavity surrounded by the discharge pipe 2 and the discharge cylinder 6, and is extruded from the discharge pipe 2. During this process, the feed through hole 4 of the sealing seat 3 is always sealed by the lower surface of the cover 20 of the lower mushroom pin; when the force applied to the button 1 is removed, the elastomer 5 resumes deformation, driving the discharge cylinder 6 to move upward, the button 1 resets, the cover 20 of the upper mushroom pin resumes deformation, the nozzle of the discharge pipe 2 and the discharge through hole 7 of the discharge cylinder 6 are closed, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 decreases, the edge of the cover 20 of the lower mushroom pin turns up, the feed through hole 4 of the sealing seat 3 opens, and the filler below the sealing seat 3 is extruded from the feed through hole 4 of the sealing seat 3 and enters the space between the discharge cylinder 6 and the sealing seat 3. When the pressure on both sides of the sealing seat 3 is equal, the cover 20 of the lower mushroom pin resumes deformation, and the feed through hole 4 of the sealing seat 3 is closed.

[0080] Example 3

[0081] The elastomeric toothpaste pump is basically the same as that in Embodiment 1, except that: the upper one-way valve 8 and the lower one-way valve 9 are respectively an elastic sealing piece 23 and a mushroom pin; an annular inner concave step 3.1 surrounding the discharge through hole 7 is provided on the closed end of the discharge cylinder 6, and the annular ring 22 of the elastic sealing piece 23 is fixed in the annular inner concave step 3.1 on the closed end of the discharge cylinder 6, and the sealing piece 23 covers the discharge through hole 7 on the closed end of the discharge cylinder 6; a central through hole 18 and more than one surrounding through hole 19 close to the central through hole 18 are provided on the sealing seat 3, and the surrounding through hole 19 on the sealing seat 3 is the feed through hole 4. The shank 21 of the mushroom pin is inserted into the central through hole 18 on the sealing seat 3 and is fixedly connected to the sealing seat 3. The cover 20 of the mushroom pin is located above the sealing seat 3, and the lower surface is used to cover and seal the surrounding through hole 19 on the sealing seat 3. The packaging bottle containing the elastomeric toothpaste pump of the present invention is as Figure 24 shown.

[0082] The operation process of the elastomeric toothpaste pump of the present invention is as follows: in the natural state, the upper one-way valve 8 and the lower one-way valve 9 are closed, the nozzle of the discharge pipe 2 and the discharge through hole 7 of the discharge cylinder 6 are sealed by the sealing piece 23 of the elastic sealing piece 23, and the feed through hole 4 of the sealing seat 3 is sealed by the lower surface of the cover 20 of the mushroom pin; when a downward force is applied to the key 1, under the action of the key 1, the elastomer 5 deforms, driving the discharge cylinder 6 to move downward, the nozzle of the discharge pipe 2 opens, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 increases, the sealing piece 23 of the elastic sealing piece 23 moves above the discharge through hole 7, the discharge through hole 7 of the discharge cylinder 6 opens, and the filler between the discharge cylinder 6 and the sealing seat 3 is extruded from the discharge through hole 7 of the discharge cylinder 6, enters the discharge pipe 2 through the cavity formed by the discharge pipe 2 and the discharge cylinder 6, and is extruded from the discharge pipe 2. During this process, the feed through hole 4 of the sealing seat 3 is always sealed by the lower surface of the cover 20 of the mushroom pin; when the force applied to the key 1 is removed, the elastomer 5 resumes deformation, driving the discharge cylinder 6 to move upward, the key 1 resets, the sealing piece 23 of the elastic sealing piece 23 returns to the initial position, covering and sealing the discharge through hole 7 and the nozzle of the discharge pipe 2 again, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 decreases, the edge of the cover 20 of the mushroom pin turns up, the feed through hole 4 of the sealing seat 3 opens, and the filler below the sealing seat 3 is extruded from the feed through hole 4 of the sealing seat 3 and enters the space between the discharge cylinder 6 and the sealing seat 3. When the pressure on both sides of the sealing seat 3 is equal, the cover 20 of the mushroom pin resumes deformation, and the feed through hole 4 of the sealing seat 3 is closed.

[0083] Embodiment 4

[0084] The elastomeric toothpaste pump is basically the same as that in Embodiment 1, except that: the upper one-way valve 8 is an elastic sealing piece 23, and an annular concave step 3.1 surrounding the discharge through-hole 7 is provided on the closed end of the discharge cylinder 6. The annular ring 22 of the elastic sealing piece 23 is fixed within the annular concave step 3.1 on the closed end of the discharge cylinder 6, and the sealing piece 23 covers the discharge through-hole 7 at the closed end of the discharge cylinder 6. The packaging bottle containing the elastomeric toothpaste pump of the present invention is as Figure 25 shown.

[0085] The operation process of the elastomeric toothpaste pump of the present invention is as follows: In the natural state, the nozzle of the discharge pipe 2 and the discharge through-hole 7 of the discharge cylinder 6 are sealed by the sealing piece 23 of the upper elastic sealing piece 23 (i.e., the upper one-way valve 8), and the feed through-hole 4 of the sealing seat 3 is sealed by the sealing piece 23 of the lower elastic sealing piece 23 (i.e., the lower one-way valve 9); when a downward force is applied to the button 1, under the action of the button 1, the elastomer 5 deforms, driving the discharge cylinder 6 to move downward, the nozzle of the discharge pipe 2 opens, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 increases, the sealing piece 23 of the upper elastic sealing piece 23 moves above the discharge through-hole 7, the discharge through-hole 7 of the discharge cylinder 6 opens, and the filler between the discharge cylinder 6 and the sealing seat 3 is extruded from the discharge through-hole 7 of the discharge cylinder 6, enters the discharge pipe 2 through the cavity formed by the discharge pipe 2 and the discharge cylinder 6, and is extruded from the discharge pipe 2. During this process, the feed through-hole 4 of the sealing seat 3 is always sealed by the sealing piece 23 of the lower elastic sealing piece 23; when the force applied to the button 1 is removed, the elastomer 5 resumes its deformation, driving the discharge cylinder 6 to move upward, the button 1 resets, the sealing piece 23 of the upper elastic sealing piece 23 returns to its initial position, covering and sealing the discharge through-hole 7 and the nozzle of the discharge pipe 2 again, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 decreases, the sealing piece 23 of the lower elastic sealing piece 23 moves above the feed through-hole 4, the feed through-hole 4 of the sealing seat 3 opens, and the filler below the sealing seat 3 is extruded from the feed through-hole 4 of the sealing seat 3 and enters the space between the discharge cylinder 6 and the sealing seat 3. When the pressures on both sides of the sealing seat 3 are equal, the sealing piece 23 of the lower elastic sealing piece 23 returns to its initial position, covering and sealing the feed through-hole 4 of the sealing seat 3 again.

[0086] Embodiment 5

[0087] The elastomeric toothpaste pump is basically the same as that in Embodiment 1, except that: it does not include the first support cylinder 13, the second support cylinder 14, the piston 15, the storage cylinder 16, and the third connecting ring 17. The elastomer 5 does not include the second connecting ring 5.6 and the outer cylinder 5.7. The large end of the umbrella body 5.5 of the elastomer 5 is in interference fit with the sealing seat 3; the upper one-way valve 8 is a flip valve, composed of a cover piece and an elastic connecting strip 24. The cover piece is a spherical segment structure and is embedded in the discharge through-hole 7 of the discharge cylinder 6. One end of the elastic connecting strip 24 is connected to the cover piece, and the other end is connected to the inner cylinder 5.1 of the elastomer 5, or as Figures 27 - 28As shown, the upper one-way valve 8 is an elastic sealing piece 23, and its annular ring 22 is a part of the inner cylinder 5.1 of the elastomer 5 or is integrally formed with the inner cylinder 5.1 of the elastomer 5. Its sealing piece 23 covers the discharge through hole 7 of the discharge cylinder 6; the structure of the discharge cylinder 6 is as Figures 29 - 30 shown. The packaging bottle of the elastomer type toothpaste pump including the present invention is as Figure 26 shown.

[0088] The operation process of the elastomer type toothpaste pump of the present invention is as follows: In the natural state, the nozzle of the discharge pipe 2 and the discharge through hole 7 of the discharge cylinder 6 are sealed by the cover piece of the folding valve or the sealing piece 23 of the upper elastic sealing piece 23 (i.e., the upper one-way valve 8), and the feed through hole 4 of the sealing seat 3 is sealed by the sealing piece 23 of the lower elastic sealing piece 23 (i.e., the lower one-way valve 9); when a downward force is applied to the button 1, under the action of the button 1, the elastomer 5 deforms, driving the discharge cylinder 6 to move downward, the nozzle of the discharge pipe 2 opens, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 increases, the cover piece of the folding valve flips upward or the sealing piece 23 of the upper elastic sealing piece 23 moves upward, the discharge through hole 7 of the discharge cylinder 6 opens, and the filler between the discharge cylinder 6 and the sealing seat 3 is extruded from the discharge through hole 7 of the discharge cylinder 6, enters the cavity formed by the discharge pipe 2 and the discharge cylinder 6, and is extruded from the discharge pipe 2. During this process, the feed through hole 4 of the sealing seat 3 is always sealed by the sealing piece 23 of the lower elastic sealing piece 23; when the force applied to the button 1 is removed, the elastomer 5 returns to its deformed state, driving the discharge cylinder 6 to move upward, the button 1 resets, the folding valve returns to its deformed state or the upper elastic sealing piece 23 resets, the cover piece of the folding valve flips downward or the sealing piece 23 of the upper elastic sealing piece 23 moves downward, the discharge through hole 7 of the discharge cylinder 6 and the nozzle of the discharge pipe 2 are closed, the pressure in the space between the discharge cylinder 6 and the sealing seat 3 decreases, the sealing piece 23 of the lower elastic sealing piece 23 moves above the feed through hole 4 of the sealing seat 3, the feed through hole 4 of the sealing seat 3 opens, and the filler below the sealing seat 3 is extruded from the feed through hole 4 of the sealing seat 3 and enters the space between the discharge cylinder 6 and the sealing seat 3. When the pressures on both sides of the sealing seat 3 are equal, the sealing piece 23 of the lower elastic sealing piece 23 returns to its initial position and covers the feed through hole 4 of the sealing seat 3 again.

Claims

1. Elastomeric toothpaste pump, comprising a button, a discharge pipe and a sealing seat, Characterized in that: It further comprises an elastomer, a discharge cylinder, an upper one-way valve, a lower one-way valve, a first support cylinder, a second support cylinder, a piston, a storage cylinder and a third connecting ring; The elastomer is mainly composed of an inner cylinder, a first connecting ring, a middle cylinder and an umbrella body. The two ends of the inner cylinder and the middle cylinder are open. The inner cylinder is located inside the middle cylinder, and their upper ends are flush and connected to each other through the first connecting ring. The lower end of the middle cylinder is connected to the small end of the umbrella body; The discharge cylinder is open at only one end. The open end of the discharge cylinder is inserted between the inner cylinder and the middle cylinder of the elastomer. The discharge cylinder is fixedly connected to the elastomer. A discharge through hole is provided on the closed end of the discharge cylinder; The button is located above the elastomer and is used to drive the elastomer to move downward; the discharge pipe is inserted into the inner cylinder of the elastomer, and the two are in interference sealing fit; the sealing seat is located below the discharge cylinder, and a feed through hole is provided thereon; The interference sealing fit between the discharge pipe and the inner cylinder of the elastomer is achieved by providing a plurality of annular protrusions c on the inner side wall of the inner cylinder of the elastomer; The interference sealing fit between the discharge pipe and the inner cylinder of the elastomer is achieved by sleeving a sealing member on the discharge pipe; Both ends of the first support cylinder and the second support cylinder are open. The first support cylinder is sleeved inside the second support cylinder, and their lower ends are flush and connected to the sealing seat at the same time; the elastomer further comprises a second connecting ring and an outer cylinder. The umbrella body is sleeved inside the outer cylinder and the two are connected to each other through the second connecting ring; the outer cylinder of the elastomer is inserted between the first support cylinder and the second support cylinder, and the first support cylinder is inserted between the umbrella body and the outer cylinder of the elastomer; The storage cylinder is open at both ends; the closed end of the discharge cylinder and the part near the closed end are fixed inside the piston through the third connecting ring; the piston is located inside the storage cylinder and is in interference sealing fit with the storage cylinder; the storage cylinder is located inside the first support cylinder; the sealing seat is located below the storage cylinder and the two are fixedly connected; The upper one-way valve is installed on the discharge through hole of the discharge cylinder and is used to unidirectionally communicate the spaces on the upper and lower sides of the closed end of the discharge cylinder; the lower one-way valve is installed on the feed through hole of the sealing seat and is used to unidirectionally communicate the spaces on the upper and lower sides of the sealing seat; all unidirectional communications mean that the filler can only flow from bottom to top; When a downward force is applied to the button, under the action of the button, the elastomer deforms, driving the discharge cylinder to move downward, the nozzle of the discharge pipe opens, and at the same time, the pressure in the space between the discharge cylinder and the sealing seat increases, and the upper one-way valve acts, and the discharge through hole of the discharge cylinder opens. The filler between the discharge cylinder and the sealing seat is extruded from the discharge through hole of the discharge cylinder, enters the discharge pipe through the cavity surrounded by the discharge pipe and the discharge cylinder, and is extruded from the discharge pipe. During this process, the feed through hole of the sealing seat is always sealed by the lower sealing valve; when the force applied to the button is removed, the elastomer returns to its original shape, driving the discharge cylinder to move upward, the button resets, the upper one-way valve returns to its original shape, the nozzle of the discharge pipe and the discharge through hole of the discharge cylinder are closed, the pressure in the space between the discharge cylinder and the sealing seat decreases, the lower sealing valve acts, and the feed through hole of the sealing seat opens. The filler below the sealing seat is extruded from the feed through hole of the sealing seat and enters the space between the discharge cylinder and the sealing seat. When the pressures on the upper and lower sides of the sealing seat are equal, the lower sealing valve returns to its initial position and covers the feed through hole again.

2. The elastomeric toothpaste pump according to claim 1, It is characterized in that The open end of the discharge barrel is directly inserted between the inner barrel and the middle barrel of the elastomer; the fixed connection structure between the discharge barrel and the elastomer is as follows: an annular protrusion a is provided on the inner and outer walls of the discharge barrel, and an annular groove d is provided on the outer wall of the inner barrel and the inner wall of the middle barrel, and the annular protrusion a is embedded in the annular groove d.

3. The elastomeric toothpaste pump according to claim 1, It is characterized in that The open end of the discharge cylinder is indirectly inserted between the inner cylinder and the middle cylinder of the elastomer, specifically: an additional cylinder is also provided between the inner cylinder and the middle cylinder of the elastomer, both ends of the additional cylinder are open and flush with the upper end of the inner cylinder, and the open end of the discharge cylinder is inserted between the middle cylinder and the additional cylinder of the elastomer; the fixed connection structure between the discharge cylinder and the elastomer is: an annular protrusion b is provided on the inner and outer walls of the discharge cylinder, and an annular groove e is provided on the outer wall of the additional cylinder and the inner wall of the middle cylinder, and the annular protrusion b is embedded in the annular groove e.

4. The elastomeric toothpaste pump according to claim 1, It is characterized in that The interference seal fit between the discharge pipe and the inner tube of the elastomer is achieved by putting a seal on the discharge pipe. The seal consists of a cylindrical tube and a conical tube. Both ends of the cylindrical tube and the conical tube are open. The upper end of the cylindrical tube is fixedly connected to the discharge pipe, and the lower end is fixedly connected to the small end of the lower end of the conical tube. The large end of the upper end of the conical tube is interference sealed with the inner wall of the inner tube.

5. The elastomeric toothpaste pump according to any one of claims 1 to 4, It is characterized in that The large end of the umbrella body of the elastic body is interference fit with the sealing seat; The upper one-way valve is an elastic sealing piece or a folding valve, and the lower one-way valve is an elastic sealing piece; The elastic sealing sheet is composed of an annular ring, a sealing sheet located in the middle of the annular ring, and a connecting strip connecting the annular ring and the sealing sheet; the folding valve is composed of a cover and an elastic connecting strip; When the upper one-way valve is an elastic sealing sheet, its annular ring is a part of the inner cylinder of the elastic body, or is integrally formed with the inner cylinder of the elastic body, and its sealing sheet covers the discharge through hole of the discharge cylinder; when the upper one-way valve is a folding valve, its cover is a spherical segment structure and is embedded in the discharge through hole of the discharge cylinder, and one end of its elastic connecting strip is connected to the cover, and the other end is connected to the inner cylinder of the elastic body; The sealing seat is provided with an annular concave step, the annular ring of the lower one-way valve is fixed in the annular concave step of the sealing seat, and the sealing piece of the lower one-way valve covers the feed through hole of the sealing seat.

6. The elastomeric toothpaste pump according to any one of claims 1 to 4, It is characterized in that The upper one-way valve and the lower one-way valve are both mushroom nails, or the upper one-way valve and the lower one-way valve are both elastic sealing sheets, or the upper one-way valve and the lower one-way valve are respectively mushroom nails and elastic sealing sheets, or the upper one-way valve and the lower one-way valve are respectively elastic sealing sheets and mushroom nails; The mushroom nail is a mushroom-shaped structure, including a cover body and a handle body connected to the cover body. The cover body is an elastic sheet, and the edge will bend toward the n side after receiving the impact force from the m side. The m side and the n side are two opposite sides, and the m side is the side where the handle body is located. The elastic sealing sheet is composed of an annular ring, a sealing sheet located in the middle of the annular ring, and a connecting strip connecting the annular ring and the sealing sheet; When the upper one-way valve or the lower one-way valve is a mushroom stud, a central through-hole and more than one surrounding through-hole close to the central through-hole are provided on the closed end or the sealing seat of the discharge cylinder. The surrounding through-holes on the closed end or the sealing seat of the discharge cylinder are the discharge through-holes or the feed through-holes. The shank of the mushroom stud is inserted into the central through-hole on the closed end or the sealing seat of the discharge cylinder and is fixedly connected to the closed end or the sealing seat of the discharge cylinder. The cap of the mushroom stud is located above the closed end or the sealing seat of the discharge cylinder, and the lower surface is used to cover and seal the surrounding through-holes on the closed end or the sealing seat of the discharge cylinder. When the upper one-way valve or the lower one-way valve is an elastic sealing sheet, an annular concave step surrounding the discharge through-hole or the feed through-hole is provided on the closed end or the sealing seat of the discharge cylinder. The annular ring of the elastic sealing sheet is fixed in the annular concave step on the closed end or the sealing seat of the discharge cylinder, and the sealing sheet covers the discharge through-hole at the closed end of the discharge cylinder or the feed through-hole of the sealing seat.

7. The elastomeric toothpaste pump according to claim 6, characterized in that when the upper one-way valve is a mushroom stud, the upper surface of the cap of the mushroom stud is used to cover and seal the orifice of the discharge pipe and has a spherical segment structure.

8. The elastomeric toothpaste pump according to claim 6, characterized in that the thickness of the cap of the mushroom stud decreases from the center to the edge; the shank of the mushroom stud is composed of a connecting cylinder, a transition cylinder and a cone connected coaxially in sequence. The connecting cylinder is connected to the cap of the mushroom stud, and the diameter of the transition cylinder is larger than that of the connecting cylinder and is equal to the bottom diameter of the cone.

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