A pump head structure for a cosmetic container and a working method thereof

Abstract

The present invention provides a pump head structure for a cosmetic container, including a push head, a pump assembly and a bottle cap. The pump assembly includes an elastomer, an anti-backflow rod and a pump housing. The elastomer forms a receiving cavity with openings at both ends. The anti-backflow rod axially penetrates the interior of the receiving cavity and is sealed and connected to the openings at both ends of the receiving cavity. One end of the elastomer is connected to the push head, and the other end of the elastomer is embedded in the interior of the pump housing. The present invention simplifies the pump assembly into three main components: the elastomer, the anti-backflow rod and the pump housing. The elastomer not only plays the role of a spring, but also cooperates with the anti-backflow rod and the push head to generate negative pressure to extract the cosmetic liquid from the cosmetic container. At the same time, the receiving cavity formed by the elastomer can also be used for temporary storage and circulation of the cosmetic liquid. The present invention simplifies the structure of the pump assembly, and because the pump head structure of the present invention is made of PP material, the workload in the recycling link after the pump structure is used is reduced, and it can be widely promoted and used.

Description

Technical Field

[0001] The invention relates to the field of cosmetic containers, and in particular to a pump head structure for a cosmetic container and a working method thereof. Background Art

[0002] In the prior art, in order to keep the cosmetic liquid or solution from being contaminated by frequently opening the cosmetic container cover, and for the convenience of use, most cosmetic containers are equipped with a push-type pump head. When pressed, the emulsion or solution in the cosmetic container flows out from the nozzle. The existing push pump heads on the market have the disadvantages of complex structure and many parts. For example, the prior patent with publication number CN110192705A discloses a cosmetic container, in which the parts related to the push pump head include a pump body, a push head, a piston, a piston seat, a bottle piston, a connecting seat, an inner plug, a spring, a first sealing ring, a first sealing gasket, a second sealing ring, a second sealing gasket and many other parts. The assembly process is complicated and the production efficiency is low. In addition, the springs of the commonly used push pump heads on the market are mostly made of metal materials, and the structure is usually relatively thin. Since the spring is used to support the reset of the push head, the thin spring is prone to reset hysteresis after long-term use, and the supporting force is not stable enough, which affects the stability of the movement of the push head. At the same time, when the metal spring is recycled after use, it is necessary to disassemble and sort the metal spring and other plastic parts, which increases the complexity of the recycling work. Therefore, simplifying the pump head structure and using plastic elastomers instead of metal springs have become technical issues that need to be solved in this field. Summary of the invention

[0003] The technical problem solved by the invention is: how to simplify the pump head structure and replace the use of metal springs.

[0004] In order to solve the above-mentioned technical problems, the technical solution of the present invention provides a pump head structure for a cosmetic container, including a push head, a pump assembly and a bottle cap, characterized in that the pump assembly includes an elastomer, an anti-backflow rod and a pump housing, the elastomer is formed into a accommodating cavity with openings at both ends, the anti-backflow rod axially penetrates the interior of the accommodating cavity and is sealed and connected to the openings at both ends of the accommodating cavity, one end of the elastomer is connected to the push head, and the other end of the elastomer is embedded in the interior of the pump housing.

[0005] Preferably, the press head is formed with a press head connecting portion, a nozzle and a first flow channel connecting the nozzle and the accommodating chamber, the elastomer is formed with a first connecting portion connected to the press head connecting portion, a liquid outlet connecting the first flow channel and the accommodating chamber, and a second connecting portion embedded in the interior of the pump housing, the anti-backflow rod includes a top rod portion located inside the first flow channel, a sealing portion for sealing the liquid outlet, a rod body located inside the accommodating chamber, and a tail seat portion seal-connected to the second connecting portion, the pump housing includes a first cavity for accommodating the elastomer and the tail seat portion, a second cavity for accommodating the cosmetic liquid flowing in from the liquid inlet hole, a liquid inlet hole opened at the bottom of the second cavity, and a second flow channel connected to the second cavity through the liquid inlet hole.

[0006] Preferably, the first connection portion of the elastomer is formed as a groove with an inner wall having an internal thread, the push-head connection portion is formed with an external thread matching the internal thread of the first connection portion, and the first connection portion and the push-head connection portion are fastened to each other via the internal thread and the external thread.

[0007] Preferably, the connection between the push rod portion and the sealing portion is formed into a stepped state in which the cross-sectional diameter of the push rod portion is larger than the cross-sectional diameter of the sealing portion, and the cross-sectional diameter of the rod body is smaller than the cross-sectional diameter of the sealing portion.

[0008] Preferably, a piston is formed at the end of the rod body, a piston hole axially penetrating the tailstock portion is formed at the central position of the tailstock portion, a support member axially penetrating the piston hole is formed on the hole wall of the piston hole, and the piston is pressed against the top surface of the support member and moves axially along the piston hole.

[0009] Preferably, an anti-backflow pad is installed on the bottom surface of the second cavity of the pump housing, and the anti-backflow pad is a one-way flow valve.

[0010] Preferably, an anti-slip recess is provided on the inner side wall of the first cavity along the circumferential direction, an anti-slip protrusion is provided on the outer side wall of the second connecting part at a position corresponding to the anti-slip protrusion, and the protective protrusion of the second connecting part embedded in the first cavity is located in the anti-slip recess.

[0011] Preferably, the pressing head is located in the first flow channel at a position corresponding to the top surface of the push rod portion and bulges outward to form a top bulge, and the distance between the surface of the top bulge and the top surface of the push rod portion is greater than the height of the sealing portion.

[0012] Preferably, the top of the bottle cap is concave to form a movable groove for the button to move freely up and down, the bottom surface of the movable groove forms a mounting hole for mounting the pump assembly, and the bottle cap is formed with a mounting interface for mounting on a cosmetic container below the mounting hole.

[0013] In order to solve the above technical problems, the technical solution of the present invention further provides a working method of a pump head for a cosmetic container, wherein the working method is as follows:

[0014] The pump head structure is installed and fastened to the mouth of the cosmetic container, and the pump head is sealed and connected to the cosmetic container;

[0015] The pressing head is pressed, and the pressing head compresses the elastic body downward through the pressing head connecting part. During the compression process, the liquid outlet of the elastic body slides from the sealing part of the anti-backflow rod to the rod body. Since the cross-sectional diameter of the rod body is smaller than the cross-sectional diameter of the sealing part, when the liquid outlet slides to the position of the rod body, a gap is generated between the liquid outlet and the rod body, and the cosmetic liquid in the accommodating cavity flows from the gap to the first flow channel;

[0016] Continue to press the pressing head, the top protrusion of the pressing head contacts the top rod of the anti-backflow rod and moves the anti-backflow rod downward together with the pressing head, the accommodating chamber is further compressed, and the cosmetic liquid in the accommodating chamber continues to flow from the gap to the first flow channel. When the first flow channel is filled, the cosmetic liquid flows from the first flow channel to the nozzle and flows out from the nozzle;

[0017] Release the pressing head, the elastic body rebounds, the liquid outlet hole of the elastic body rebounds from the rod body of the anti-backflow rod to the sealing part and forms a sealed connection with the sealing part, and continues to rebound, the liquid outlet hole rebounds to the step formed between the sealing part and the top rod part and drives the anti-backflow rod to rebound in the direction of the pressing head.

[0018] During the rebound process, the volume expansion of the accommodating chamber causes a negative pressure in the accommodating chamber that is lower than the internal pressure of the cosmetic container. The cosmetic liquid in the cosmetic container enters the second cavity in the pump housing through the one-way anti-backflow pad at the liquid inlet hole, and continues to rebound. The cosmetic liquid in the second cavity enters the accommodating chamber through the piston hole of the tail seat.

[0019] The beneficial effects of the technical solution of the present invention are:

[0020] The present invention simplifies the pump assembly into three main parts: an elastic body, an anti-backflow rod and a pump housing. The elastic body plays the role of a spring and can also cooperate with the anti-backflow rod and the head to generate negative pressure to extract the cosmetic liquid from the cosmetic container. At the same time, the accommodating cavity formed by the elastic body can also be used for temporary storage and circulation of the cosmetic liquid. The present invention greatly simplifies the structure of the pump assembly, and because the pump head structure of the present invention is made of PP material, it also reduces the workload in the recycling link after the pump structure is used, and can be widely promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the pump head structure in an embodiment of the present invention;

[0022] Figure 2It is a structural schematic diagram of a pressing head in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the elastic body in an embodiment of the present invention;

[0024] Figure 4 This is a schematic structural diagram of an anti-backflow rod in an embodiment of the present invention;

[0025] Figure 5 A bottom view of the anti-backflow rod in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the pump housing in an embodiment of the present invention.

[0027] Among them, 1-press head; 2-pump assembly; 3-bottle cap; 4-anti-backflow pad; 11-press head connecting part; 12-nozzle; 13-first flow channel; 14-top protrusion; 15-stabilizing part; 21-elastic body; 22-anti-backflow rod; 23-pump housing; 31-movable groove; 32-installation interface; 151-limiting part; 152-bending part; 211-accommodating cavity; 212-first connecting part; 21 3-liquid outlet; 214-second connecting part; 221-rod part; 222-sealing part; 223-rod body; 224-tail seat; 231-first cavity; 232-second cavity; 233-liquid inlet; 234-second flow channel; 235-flange; 2141-anti-slip protrusion; 2231-piston; 2241-piston hole; 2242-supporting member; 2311-anti-slip concave; DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which shows a pump head structure for a cosmetic container of the present invention, including a push head 1, a pump assembly 2 and a bottle cap 3. The pump assembly 2 includes an elastic body 21, an anti-backflow rod 22 and a pump housing 23, wherein the elastic body 21 includes a first connecting portion 212, a liquid outlet 213, a accommodating cavity 211 and a second connecting portion 214 formed from top to bottom, the anti-backflow rod 22 includes a push rod portion 221, a sealing portion 222, a rod body 223 and a tail seat portion 224 formed from top to bottom, and the pump housing 23 includes a first cavity 231, a second cavity 232, a liquid inlet 233, a second flow channel 234 and a flange 235; the push head 1 includes a nozzle 12, a first flow channel 13, a push head connecting portion 11, a top protrusion 14 and a stabilizing portion 15; the bottle cap 3 includes a movable groove 31, a mounting hole (not shown), a mounting interface 32 and a card slot (not shown). In the embodiment of the present invention, the push head 1, the bottle cap 3, the anti-backflow rod 22 and the pump housing 23 are made of hard PP material, and the elastomer 21 is made of soft PP material with resilience.

[0032] The assembly steps of the pump head structure of the embodiment of the present invention are as follows:

[0033] First, insert the pump housing 23 into the mounting hole (not shown) of the bottle cap 3: a flange 235 is provided on the top edge of the pump housing 23, and a slot (not shown) is provided at the position where the bottle cap 3 engages with the pump housing 23. The flange 235 of the installed pump housing 23 is inserted into the slot of the bottle cap 3, and the pump housing 23 is located in the cavity formed by the mounting interface 32 of the bottle cap 3. The mounting interface 32 of the bottle cap 3 in the embodiment of the present invention is provided for fastening the bottle cap 3 to the cosmetic container. When the bottle cap 3 is fastened to the cosmetic container, the pump housing 23 is placed at the bottle mouth of the cosmetic container;

[0034] Then insert the second connection part 214 of the elastic body 21 into the first cavity 231 of the pump housing 23: the outer diameter of the second connection part 214 of the elastic body 21 is slightly larger than the inner diameter of the first cavity 231 of the pump housing 23. Since the elastic body 21 made of soft PP material has certain ductility and elasticity, the second connection part 214 of the elastic body 21 can be fastened in the first cavity 231 of the pump housing 23 by its own elastic tension. The receiving cavity 211 of the connected elastic body 21 is located in the movable groove 31 of the bottle cap 3, and a space for the pressing head 1 to move freely up and down is reserved between the outer wall of the receiving cavity 211 of the elastic body 21 and the inner wall of the movable groove 31 of the bottle cap 3.

[0035] Afterwards, the anti-backflow rod 22 is installed in the accommodating cavity 211 of the elastomer 21: the sealing portion 222 of the installed anti-backflow rod 22 is sealed and connected to the liquid outlet hole 213 of the elastomer 21, the tail seat portion 224 of the anti-backflow rod 22 is sealed and connected to the second connecting portion 214 of the elastomer 21, the top rod portion 221 of the anti-backflow rod 22 is located in the cavity formed by the first connecting portion 212 of the elastomer 21, and the rod body 223 of the anti-backflow rod 22 is located in the accommodating cavity 211 of the elastomer 21. In the embodiment of the present invention, the diameter of the liquid outlet 213 is set to be smaller than the cross-sectional diameter of the cross section of the sealing portion 222, and the diameter of the inner cavity of the second connecting portion 214 of the elastic body 21 is set to be smaller than the outer diameter of the tail seat portion 224. Through the above arrangement, due to the elastic ductility of the elastic body 21 itself, the liquid outlet 213 of the elastic body 21 is tightly sleeved on the sealing portion 222 of the anti-backflow rod 22, and the second connecting portion 214 of the elastic body 21 is tightly sleeved on the tail seat portion 224 of the anti-backflow rod 22. The top rod portion 221 and the sealing portion 222 of the anti-backflow rod 22 are formed into a step shape in which the cross-sectional diameter of the top rod portion 221 is larger than the cross-sectional diameter of the sealing portion 222, so as to prevent the liquid outlet 213 of the elastic body 21 from moving from the sealing portion 222 to the top rod portion 221, as shown in FIG. Figure 1 As shown in , the liquid outlet 213 is blocked by the step surface at the connection between the top rod portion 221 and the sealing portion 222, and cannot move from the sealing portion 222 to the top rod portion 221. The cross-sectional diameter of the rod body 223 of the anti-backflow rod 22 is set to be smaller than the cross-sectional diameter of the sealing portion 222, and the aperture of the liquid outlet 213 of the elastic body 21 is set to be larger than the cross-sectional diameter of the rod body 223. Through the above arrangement, when the liquid outlet 213 of the elastic body 21 moves from the sealing portion 222 of the anti-backflow rod 22 to the rod body 223, a gap is formed between the edge of the liquid outlet 213 and the rod body 223, and the cosmetic liquid in the accommodating chamber 211 flows out of the liquid outlet 213 from the gap.

[0036] Finally, the push head 1 is connected to the elastomer 21: the push head connection part 11 of the push head 1 is fastened to the first connection part 212 of the elastomer 21. In the embodiment of the present invention, the push head connection part 11 is formed with an external thread (not shown), and the first connection part 212 of the elastomer 21 is formed with an internal thread (not shown) matching the external thread, and the push head 1 and the elastomer 21 are fastened by the connection of the external thread and the internal thread. The first flow channel 13 of the connected push head 1 is connected to the accommodating chamber 211 through the liquid outlet 213 of the elastomer 21, the stabilizing part 15 of the push head 1 is located in the space between the outer wall of the accommodating chamber 211 and the inner wall of the movable groove 31, and the top protrusion 14 of the push head 1 is located at a position opposite to the top surface of the top rod part 221 of the anti-backflow rod 22.

[0037] It should be specially noted that the above-mentioned assembly steps are one of the assembly methods of the present invention, and the above-mentioned assembly steps may also be disrupted, and ultimately the pump head structure can be assembled into a finished product state.

[0038] In the embodiment of the present invention, the end of the stabilizing portion 15 of the pressing head 1 protrudes toward the side of the bottle cap 3 to form a limiting portion 151, and is bent toward the side of the elastic body 21 to form a bending portion 152. When the pressing head 1 moves up and down in the movable groove 31 of the bottle cap 3, the limiting portion 151 is close to the inner side wall of the movable groove 31 of the bottle cap 3, and the end of the bending portion 152 is close to the outer side wall of the accommodating cavity 211 of the elastic body 21. The arrangement of the limiting portion 151 and the bending portion 152 ensures the stability of the pressing head 1 when it moves up and down in the movable groove 31, and ensures that the pressing head 1 moves vertically instead of obliquely when it moves up and down, which can effectively prevent the wear of the pressing head 1 and the bottle cap 3 and the damage of the connection between the pressing head 1 and the elastic body 21 due to uneven force, thereby ensuring the service life.

[0039] In the embodiment of the present invention, a top protrusion 14 is formed on the inner side of the top of the pressing head 1 protruding toward the second flow channel 234, and the top protrusion 14 is arranged opposite to the top surface of the top rod portion 221 of the anti-backflow rod 22. The distance between the top protrusion 14 and the top surface of the top rod portion 221 is greater than the height of the sealing portion 222 of the anti-backflow rod 22. The purpose of the above arrangement is to push the liquid outlet 213 of the elastic body 21 from the sealing portion 222 of the anti-backflow rod 22 to the top of the elastic body 21 when the pressing head 1 is pressed. After the rod body 223 is in position, the backflow prevention rod 22 is pressed by the top protrusion 14 of the pressing head 1 and moves downward together with the pressing head 1. If the distance between the top protrusion 14 and the top surface of the top rod part 221 is not set to be greater than the height of the sealing part 222 of the anti-backflow rod 22, that is, when the liquid outlet 213 has not completely separated from the sealing part 222, the backflow prevention rod 22 and the elastic body 21 move downward together with the pressing head 1, and the cosmetic liquid in the accommodating cavity 211 of the elastic body 21 cannot flow out from the liquid outlet 213.

[0040] In the embodiment of the present invention, the rod body 223 of the anti-backflow rod 22 is connected to the tail seat 224 by a piston 2231. The tail of the rod body 223 is formed with a piston 2231, and the tail seat 224 is formed with a piston hole 2241 that penetrates along the axial direction of the tail seat 224. A support member 2242 is formed on the inner side wall of the piston hole 2241 and protrudes along the axial direction of the piston hole 2241. Figure 5 As shown, the piston 2231 is in close contact with the top surface of the protruding support member 2242 and moves along the top surface of the support member 2242. A channel for the flow of cosmetic liquid is formed between the piston 2231, the support member 2242 and the inner wall of the piston hole 2241, and the channel connects the accommodating cavity 211 of the elastomer 21 and the second cavity 232 of the pump housing 23.

[0041] In the embodiment of the present invention, an anti-slip recess 2311 is provided on the inner wall of the first cavity 231, and an anti-slip protrusion 2141 is provided on the outer wall of the second connecting portion 214. When the second connecting portion 214 of the elastomer 21 is inserted into the first cavity 231 of the pump housing 23, the anti-slip protrusion 2141 is located in the anti-slip recess 2311. The combination of the anti-slip protrusion 2141 and the anti-slip recess 2311 increases the friction between the second connecting portion 214 of the elastomer 21 and the inner wall of the first cavity 231 of the pump housing 23, thereby further increasing the fastening stability of the elastomer 21 and the pump housing 23.

[0042] In the embodiment of the present invention, a liquid inlet 233 is provided between the second cavity 232 and the second flow channel 234 of the pump housing 23, for the cosmetic liquid to flow from the second flow channel 234 to the second cavity 232. In order to control the unidirectional flow of the cosmetic liquid, that is, to allow the cosmetic liquid to flow only from the second flow channel 234 to the second cavity 232, an anti-backflow pad 4 is installed between the bottom of the second cavity 232 and the liquid inlet 233. The anti-backflow pad 4 selected in the present invention is a conventional one-way valve structure in the existing design, which will not be described in detail here.

[0043] In the present invention, the overall flow direction of the cosmetic liquid is as follows: the cosmetic liquid enters the second flow channel 234 from the cosmetic container, enters the second cavity 232 through the anti-backflow pad 4 of the liquid inlet hole 233, enters the accommodating cavity 211 from the second cavity 232 through the piston hole 2241 of the tail seat portion 224, then enters the first flow channel 13 from the accommodating cavity 211 through the liquid outlet hole 213, and finally flows out of the pump head from the second flow channel 234 through the nozzle 12.

[0044] The method of the present invention to achieve the above-mentioned cosmetic liquid flow is as follows:

[0045] The pressing head 1 is pressed, and the pressing head 1 compresses the elastic body 21 downward through the pressing head connecting portion 11. During the compression process, the liquid outlet 213 of the elastic body 21 slides from the sealing portion 222 of the anti-backflow rod 22 to the rod body 223. Since the cross-sectional diameter of the rod body 223 is smaller than the cross-sectional diameter of the sealing portion 222, when the liquid outlet 213 slides to the position of the rod body 223, a gap is generated between the liquid outlet 213 and the rod body 223, and the cosmetic liquid stored in the accommodating cavity 211 flows from the gap to the first flow channel 13;

[0046] The pressing head 1 is continuously pressed, and the top protrusion 14 of the pressing head 1 contacts the top rod portion 221 of the anti-backflow rod 22 and moves the anti-backflow rod 22 downward together with the pressing head 1. The accommodating chamber 211 is further compressed, and the cosmetic liquid in the accommodating chamber 211 continues to flow from the gap to the first flow channel 13. When the first flow channel 13 is filled, the cosmetic liquid flows from the first flow channel 13 to the nozzle 12 and flows out from the nozzle 12.

[0047] When the pressing head 1 is released, the elastic body 21 rebounds, and the liquid outlet hole 213 of the elastic body 21 rebounds from the rod body 223 of the anti-backflow rod 22 to the sealing part 222 and forms a sealed connection with the sealing part 222, and continues to rebound, and the liquid outlet hole 213 rebounds to the step formed between the sealing part 222 and the top rod part 221 and drives the anti-backflow rod 22 to rebound toward the pressing head 1.

[0048] During the rebound process, the volume expansion of the accommodating chamber 211 causes the pressure in the accommodating chamber 211 to be lower than the internal pressure of the cosmetic container, that is, a negative pressure is formed in the accommodating chamber 211 relative to the cosmetic container, and the cosmetic liquid in the cosmetic container enters the second cavity 232 in the pump housing 23 through the anti-backflow pad 4 at the liquid inlet hole 233, and continues to rebound. The cosmetic liquid in the second cavity 232 enters the accommodating chamber 211 through the piston hole 2241 of the tail seat portion 224 to replenish the cosmetic liquid flowing out of the accommodating chamber 211.

[0049] In summary, the present invention simplifies the pump assembly into three main components: an elastic body, an anti-backflow rod, and a pump housing. The elastic body not only plays the role of a spring, but also cooperates with the anti-backflow rod and the head to generate negative pressure to extract the cosmetic liquid from the cosmetic container. At the same time, the accommodating cavity formed by the elastic body can also be used for temporary storage and circulation of the cosmetic liquid. The present invention greatly simplifies the structure of the pump assembly, and because the pump head structure of the present invention is made of PP material, it also reduces the workload in the recycling link after the pump structure is used, and can be widely promoted for use.

[0050] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump head structure for a cosmetic container, comprising a push head, a pump assembly and a bottle cap, characterized in that: The pump assembly comprises an elastic body, an anti-backflow rod and a pump housing, wherein the elastic body is formed into a receiving cavity with openings at both ends, the anti-backflow rod is axially arranged inside the receiving cavity and is sealed and connected to the openings at both ends of the receiving cavity, one end of the elastic body is connected to the push head, and the other end of the elastic body is embedded in the interior of the pump housing; The push head is formed with a push head connection part, a nozzle and a first flow channel connecting the nozzle and the accommodating chamber, the elastic body is formed with a first connection part connected with the push head connection part, a liquid outlet hole connecting the first flow channel and the accommodating chamber, and a second connection part embedded in the interior of the pump housing, the anti-backflow rod includes a top rod part located inside the first flow channel, a sealing part for sealing the liquid outlet hole, a rod body located inside the accommodating chamber, and a tail seat part sealedly connected with the second connection part, the pump housing includes a first cavity for accommodating the elastic body and the tail seat part, a second cavity for accommodating the cosmetic liquid flowing in from the liquid inlet hole, a liquid inlet hole opened at the bottom of the second cavity, and a second flow channel connected with the second cavity through the liquid inlet hole; The connection between the push rod and the sealing part is formed into a step state in which the cross-sectional diameter of the push rod is larger than the cross-sectional diameter of the sealing part, and the cross-sectional diameter of the rod body is smaller than the cross-sectional diameter of the sealing part; A piston is formed at the end of the rod body, a piston hole axially penetrating the tailstock part is formed at the central position of the tailstock part, a support member axially penetrating the piston hole is formed on the hole wall of the piston hole, and the piston is closely attached to the top surface of the support member and moves axially along the piston hole.

2. The pump head structure for a cosmetic container according to claim 1, characterized in that: The first connection part of the elastomer is formed into a groove with an inner wall having an internal thread, and the push-head connection part is formed with an external thread matching the internal thread of the first connection part, and the first connection part and the push-head connection part are fastened and connected via the internal thread and the external thread.

3. The pump head structure for a cosmetic container according to claim 1, characterized in that: An anti-backflow pad is installed on the bottom surface of the second cavity of the pump housing, and the anti-backflow pad is a one-way flow valve.

4. The pump head structure for a cosmetic container according to claim 1, characterized in that: An anti-slip recess is provided on the inner wall of the first cavity along the circumferential direction, and an anti-slip protrusion is provided at a position corresponding to the outer wall of the second connecting part and the anti-slip recess. The anti-slip protrusion of the second connecting part embedded in the first cavity is located in the anti-slip recess.

5. The pump head structure for a cosmetic container according to claim 1, characterized in that: The pressing head is located in the first flow channel at a position corresponding to the top surface of the push rod portion and protrudes outward to form a top bulge. The distance between the surface of the top bulge and the top surface of the push rod portion is greater than the height of the sealing portion.

6. The pump head structure for a cosmetic container according to claim 1, characterized in that: The top of the bottle cap is concave to form a movable groove for the button to move freely up and down, the bottom surface of the movable groove forms a mounting hole for mounting the pump assembly, and the bottle cap is formed with a mounting interface for mounting on a cosmetic container below the mounting hole.

7. A method for operating a pump head for a cosmetic container, characterized in that: The working method is as follows: The pump head structure is installed and fastened to the mouth of the cosmetic container, and the pump head is sealed and connected to the cosmetic container; The pressing head is pressed, and the pressing head compresses the elastic body downward through the pressing head connecting part. During the compression process, the liquid outlet of the elastic body slides from the sealing part of the anti-backflow rod to the rod body. Since the cross-sectional diameter of the rod body is smaller than the cross-sectional diameter of the sealing part, when the liquid outlet slides to the position of the rod body, a gap is generated between the liquid outlet and the rod body, and the cosmetic liquid in the accommodating cavity flows from the gap to the first flow channel; Continue to press the pressing head, the top protrusion of the pressing head contacts the top rod of the anti-backflow rod and moves the anti-backflow rod downward together with the pressing head, the accommodating chamber is further compressed, and the cosmetic liquid in the accommodating chamber continues to flow from the gap to the first flow channel. When the first flow channel is filled, the cosmetic liquid flows from the first flow channel to the nozzle and flows out from the nozzle; When the pressing head is released, the elastic body rebounds, and the liquid outlet hole of the elastic body rebounds from the rod body of the anti-backflow rod to the sealing part and forms a sealed connection with the sealing part. The liquid outlet hole rebounds to the step formed between the sealing part and the top rod part and drives the anti-backflow rod to rebound toward the pressing head direction; During the rebound process, the volume expansion of the accommodating chamber causes a negative pressure in the accommodating chamber that is lower than the internal pressure of the cosmetic container. The cosmetic liquid in the cosmetic container enters the second cavity in the pump housing through the one-way anti-backflow pad at the liquid inlet hole, and continues to rebound. The cosmetic liquid in the second cavity enters the accommodating chamber through the piston hole of the tail seat.

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