Liquid pipetting device and cosmetic packaging container

Abstract

A liquid pipetting device and a cosmetic packaging container. The liquid pipetting device comprises an inner cover, a dropper, a piston, a button, an elastic member, a middle cover, and an outer cover; the piston is arranged in a cavity in a sliding fit mode on the upper portion of the inner cover; the button is fixedly connected to the piston; the elastic member is arranged between the button and the inner cover; the dropper is fixedly mounted on the lower portion of the inner cover; the middle cover can relatively rotate around the axis of the middle cover, and can be relatively slidably fitted on the outer side of the inner cover in the up-down direction; the outer cover is fitted on the outer side of the middle cover and the outer side of the inner cover, and is rotatably connected to the inner cover, and the outer cover can be slidably connected to the middle cover in the up-down direction; and a guide groove spirally rising around the axis of the inner cover is formed in one of the middle cover and the inner cover, and a guide portion inserted into the guide groove in a sliding fit mode is arranged on the other one of the middle cover and the inner cover. The liquid pipetting device is convenient to operate, and can achieve quantitative suction of liquid.

Description

Liquid transfer device and cosmetic packaging container

[0001] This invention claims priority to Chinese patent application No. CN 2023109041186 filed on July 21, 2023. Technical Field

[0002] The invention relates to a liquid transfer device and a cosmetic packaging container. Background Art

[0003] The existing liquid transfer device installed on the container needs to be removed from the container before use. Then, the silicone head needs to be squeezed or the pressing part above the dropper needs to be pressed to expel air and form negative pressure before the liquid can be sucked up. The operation is cumbersome for the user. At the same time, since the degree of squeezing or pressing by the user varies each time, the volume of liquid sucked up each time is not fixed. Sucking up too much will cause waste, while sucking up too little will increase the number of suction operations.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a new liquid pipetting device to solve one or more problems of the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a liquid pipetting device, the liquid pipetting device comprising:

[0007] an inner cover, wherein the upper portion of the inner cover has a cavity;

[0008] A dropper extending in an up-down direction, the dropper is fixedly mounted on the lower portion of the inner cover, and a lumen of the dropper is communicated with the cavity;

[0009] a piston, the piston being slidably disposed in the cavity, the outer peripheral wall of the piston being sealedly connected to the inner peripheral wall of the cavity;

[0010] a button, slidably arranged on the upper portion of the inner cover in an up-down direction, the button being fixedly connected to the piston;

[0011] an elastic member capable of providing the force required to move the button upward and away from the inner cover;

[0012] The middle cover is mounted on the outer side of the inner cover so as to be able to rotate relative to the inner cover about its own axis and slide relative to the inner cover in the up-down direction;

[0013] The outer cover is sleeved on the outer sides of the middle cover and the inner cover. The outer cover is connected to the inner cover only by being rotatable relative to the inner cover around its own axis, and is connected to the middle cover only by being slidable relative to the middle cover in the up-down direction. At least a portion of the upper portion of the button is exposed from the upper portion of the outer cover.

[0014] Among them, one of the inner circumferential surface of the middle cover and the outer circumferential surface of the inner cover is provided with a guide groove spirally rising around the axis of the inner cover, and the other is provided with a guide part slidably inserted in the guide groove.

[0015] Preferably, the guide groove is provided on the outer peripheral portion of the inner cover, the guide portion is a guide post protruding and extending radially inward from the inner wall of the middle cover, and the guide post is inserted into the guide groove in a sliding manner.

[0016] Furthermore, the guide groove has a first end and a second end respectively arranged at two different ends in its length direction, the first end is higher than the second end, and during the movement of the guide column from the first end to the second end, the piston moves downward along the cavity to cause the liquid transfer device to discharge liquid; during the movement of the guide column from the second end to the first end, the piston moves upward along the cavity to cause the liquid transfer device to absorb liquid, and during the sliding of the guide column between the first end and the second end along the guide groove, the elastic member is always in an extended state.

[0017] In some embodiments, the guide groove is a spiral groove that spirally rises from the second end portion to the first end portion along the rotation center line of the inner cover.

[0018] Preferably, during the process of the guide post sliding from one end to the other along the guide groove, the outer cover and the middle cover rotate together relative to the inner cover through an angle of less than 180°. In some embodiments, a protrusion extending radially outward is provided on the lower portion of the inner cover, and an arcuate groove is provided on the inner periphery of the outer cover, wherein the protrusion can be slidably inserted into the arcuate groove, wherein the arc of the arcuate groove is less than 180°.

[0019] Preferably, the elastic member is a plastic member, and the elastic member is integrally formed at the lower portion of the button.

[0020] Furthermore, the elastic member includes a connecting ring sleeved on the outer periphery of the inner cover, and a plurality of elastic strips connected between the connecting ring and the button. All of the elastic strips extend spirally in the up and down directions with the axis of the button as the rotation center line.

[0021] Preferably, a guide and limiting structure is provided between the outer wall of the middle cover and the inner wall of the outer cover for limiting the relative rotation of the two and enabling the two to slide relative to each other in the up and down directions. The guide and limiting structure includes vertical grooves and convex columns that extend in the up and down directions and slide together. The vertical grooves and the convex columns are respectively provided on the outer wall of the middle cover and the inner wall of the outer cover.

[0022] Preferably, the inner cover has an upper cover body and a lower cover body connected in the up-down direction, the cavity is provided on the upper cover body, and a connecting column extending in the up-down direction is fixedly provided in the lower cover body, and a through hole penetrating in the up-down direction is provided on the connecting column, the upper part of the dropper is fixedly connected to the connecting column, and the tube cavity of the dropper is communicated with the cavity through the through hole.

[0023] Furthermore, the inner wall of the middle cover is provided with an annular boss extending radially inward, the elastic member is sleeved on the outer side of the upper cover body and rests downward on the annular boss, and a limit platform for limiting the downward movement of the annular boss is also formed between the upper cover body and the lower cover body; the lower cover body is cooperatively connected to the middle cover and the outer cover.

[0024] Another object of the present invention is to provide a cosmetic container.

[0025] To achieve the above-mentioned purpose, the technical solution of the present invention is: a cosmetic packaging container, comprising a liquid storage bottle and the above-mentioned liquid transfer device, wherein the dropper is inserted into the liquid storage bottle and the inner cover is threadedly connected to the liquid storage bottle.

[0026] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: in the liquid transfer device of the present invention, a guide groove spirally rising around the axis of the inner cover and a guide part slidably inserted in the guide groove are provided between the middle cover and the inner cover, and the outer cover can only be connected to the inner cover by rotating around its own axis relative to the inner cover, and the outer cover can only be connected to the middle cover by sliding relative to the middle cover in the up and down directions, so that rotating the outer cover can drive the middle cover to rotate relative to the inner cover, and the middle cover can move axially upward, further, the middle cover can drive the button to move upward through the elastic member, and the button drives the piston to move upward, thereby realizing automatic completion of liquid absorption and quantitative absorption during the rotation of the outer cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of the three-dimensional structure of a liquid pipetting device according to a specific embodiment of the present invention;

[0028] Figure 2 is a longitudinal cross-sectional view of Figure 1;

[0029] Figure 3 is a schematic diagram of the three-dimensional structure of the outer cover;

[0030] Figure 4 is a schematic diagram of the three-dimensional structure of the liquid transfer device in Figure 1 with the outer cover removed;

[0031] Figure 5 is a schematic diagram of the three-dimensional structure of the middle cover;

[0032] Figure 6 is a schematic diagram of the three-dimensional structure of Figure 4 with the middle cover removed;

[0033] FIG7 is a schematic diagram of the three-dimensional structure of a cosmetic packaging container according to a specific embodiment of the present invention;

[0034] Figure 8 is a longitudinal cross-sectional view of Figure 7;

[0035] Wherein: 100, liquid transfer device; 200, liquid storage bottle;

[0036] 1. Inner cover; 11. Upper cover body; 111. Cavity; 12. Lower cover body; 121. Guide groove; 121a. First end; 121b. Second end; 122. Protrusion; 123. Connecting column; 123a. Through hole; 13. Positioning platform; 2. Dropper; 21. Lumen; 3. Piston; 4. Button; 41. First flange; 5. Elastic member; 51. Connecting ring; 52. Elastic strip; 6. Middle cover; 61. Guide column; 62. Vertical groove; 63. Annular boss; 64. Second flange; 7. Outer cover; 71. Arc groove; 72. Boss. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0038] Referring to a liquid pipetting device 100 shown in FIG1 , the device comprises: an inner cover 1, a dropper 2, a piston 3, a button 4, an elastic member 5, a middle cover 6, and an outer cover 7, wherein the upper portion of the inner cover 1 has a cavity 111; the dropper 2 extends in the up-down direction, the dropper 2 is fixedly mounted on the lower portion of the inner cover 1, and the lumen 21 of the dropper 2 is communicated with the cavity 111; the piston 3 is slidably disposed in the cavity 111, and the outer peripheral wall of the piston 3 is sealed with the inner peripheral wall of the cavity 111; the button 4 is slidably disposed in the upper portion of the inner cover 1 in the up-down direction, and the button 4 It is fixedly connected to the piston 3 so that the two can move synchronously in the up and down directions relative to the inner cover 1; the elastic member 5 can provide the force required for the button 4 to move upward away from the inner cover 1; the middle cover 6 can both rotate relatively around its own axis and slide relatively in the up and down directions on the outside of the inner cover 1; the outer cover 7 is sleeved on the outside of the middle cover 6 and the inner cover 1, and the outer cover 7 can only be connected to the inner cover 1 by rotating relative to the inner cover 1 around its own axis, and the outer cover 7 can only be connected to the middle cover 6 by sliding relative to the middle cover 6 in the up and down directions; at least a part of the upper part of the button 4 can be exposed from the upper part of the outer cover 7.

[0039] A guide groove 121 spirally ascending around the axis of the inner cover 1 is provided on one of the inner circumference of the middle cover 6 and the outer circumference of the inner cover 1, and a guide portion slidingly inserted into the guide groove 121 is provided on the other, so that the middle cover 6 can move up and down relative to the inner cover 1 at the same time during the process of rotating around its own axis.

[0040] Referring to the accompanying drawings, in this embodiment, the specific structure of the liquid pipetting device 100 is as follows:

[0041] 2 and 6 , the inner cover 1 has an upper cover 11 and a lower cover 12 connected in the up-down direction, the cavity 111 is provided on the upper cover 11 , and the lower cover 12 is cooperatively connected to the middle cover 6 and the outer cover 7 .

[0042] In this embodiment, the guide groove 121 is arranged on the outer periphery of the inner cover 1, and is specifically arranged on the outer periphery of the lower cover body 12. The guide portion is a guide column 61 that protrudes radially inward from the inner wall of the middle cover 6. The guide column 61 is inserted into the guide groove 121 in a sliding manner. In the process of the middle cover 6 rotating around its own axis relative to the inner cover 1, the guide column 61 slides along the guide groove 121, so that the middle cover 6 moves upward or downward relative to the inner cover 1.

[0043] As shown in Figures 5 and 6, the guide groove 121 has a first end 121a and a second end 121b, respectively, disposed at opposite ends of its length. The first end 121a is higher than the second end 121b. That is, the guide groove 121 spirals upward from the second end 121b to the first end 121a on the outer periphery of the inner cover 1. In this embodiment, when the middle cover 6 rotates counterclockwise, the guide post 61 moves from the second end 121b to the first end 121a, causing the middle cover 6 to move upward relative to the inner cover 1. When the middle cover 6 rotates clockwise, the guide post 61 moves from the first end 121a to the second end 121b, causing the middle cover 6 to move downward relative to the inner cover 1.

[0044] The inner wall of the middle cover 6 is also provided with an annular boss 63 extending radially inward. The annular boss 63 is located above the guide column 61. A limit platform 13 is formed between the upper cover body 11 and the lower cover body 12. The limit platform 13 and the annular boss 63 cooperate with each other to limit the downward movement distance of the middle cover 6.

[0045] A guide and limiting structure is provided between the outer wall of the middle cover 6 and the inner wall of the outer cover 7 to limit relative rotation between the two and to allow the two to slide relative to each other in the vertical direction. Specifically, the guide and limiting structure includes a vertical groove 62 and a protrusion 72, both of which extend in the vertical direction and slide in conjunction with each other. The vertical groove 62 and the protrusion 72 are respectively provided on the outer wall of the middle cover 6 and the inner wall of the outer cover 7. In this embodiment, as shown in Figures 3 and 4, the vertical groove 62 is provided on the outer peripheral wall of the middle cover 6, and the protrusion 72 is provided on the inner wall of the outer cover 7 and extends radially inward from the inner wall of the outer cover 7. Under the cooperation of the vertical groove 62 and the protrusion 72, the user can rotate the outer cover 7 while driving the middle cover 6 to rotate relative to the inner cover 1. At the same time, the outer cover 7 does not limit the vertical movement of the middle cover 6 during the rotation process due to the cooperation between the guide post 61 and the guide groove 121.

[0046] In this embodiment, as the guide post 61 slides from one end to the other along the guide groove 121, the outer cover 7 and the middle cover 6 rotate together relative to the inner cover 1 by an angle of less than 180°. Referring to Figures 3, 4, and 6, the lower portion of the inner cover 1 is provided with a protrusion 122 that extends radially outward, and the inner circumference of the outer cover 7 is provided with an arcuate groove 71. The arc of the arcuate groove 71 is less than 180°. Specifically, the protrusion 122 is provided at the lower portion of the lower cover 12. As the outer cover 7 and the middle cover 6 rotate together relative to the inner cover 1, the protrusion 122 slides within the arcuate groove 71. When the protrusion 122 slides to the end of the arcuate groove 71, if the user continues to rotate the outer cover 7, the outer cover 7 will drive the inner cover 1 to rotate together.

[0047] In this embodiment, the elastic member 5 is a plastic member and is integrally formed at the bottom of the button 4, with the bottom of the elastic member 5 resting against the annular boss 63. As shown in FIG6 , the elastic member 5 comprises a connecting ring 51 sleeved on the outer periphery of the inner cover 1, and a plurality of elastic strips 52 connected between the connecting ring 51 and the button 4. All of the elastic strips 52 spirally extend in the vertical direction with the axis of the button 4 as the rotation centerline. The connecting ring 51 is fixed to the bottom of the elastic strips 52 and rests against the annular boss 63. When the inner cover 6 moves upward, the annular boss 63 pushes the connecting ring 51 and simultaneously drives the entire elastic member 5 and the button 4 upward.

[0048] A retaining structure is provided between the button 4 and the middle cover 6 to limit the upward movement of the button 4, thereby preventing the button 4 from being separated from the middle cover 6. During the downward movement of the middle cover 6, the retaining structure can also drive the button 4 downward. In this embodiment, the retaining structure includes a first flange 41 disposed at the bottom of the button 4 and extending radially outward from the outer periphery of the button 4, and a second flange 64 disposed at the top of the middle cover 6 and extending radially inward from the inner wall of the middle cover 6. During the sliding movement of the guide post 61 along the guide groove 121 between the first end 121a and the second end 121b, only the middle cover 6 moves in the vertical direction. During this entire process, the elastic member 5 is not compressed. The first flange 41 and the second flange 64 are always in contact with each other, and the elastic member 5 is always in an extended state, effectively preventing fatigue failure of the elastic member 5 due to long-term compression.

[0049] A connecting column 123 extending in the up-down direction is fixedly provided in the lower cover body 12. A through hole 123a is provided on the connecting column 123 which passes through in the up-down direction. The upper part of the dropper 2 is fixedly connected to the connecting column 123. The lumen 21 of the dropper 2 is connected to the cavity 111 through the through hole 123a.

[0050] The liquid transfer device 100 in this embodiment is usually used in conjunction with a container containing liquid.

[0051] Taking a cosmetic packaging container as an example, see Figures 7 and 8, it includes a liquid storage bottle 200 and the above-mentioned liquid transfer device 100, wherein the dropper 2 is inserted into the liquid storage bottle 200, and the inner cover 1 is threadedly connected to the liquid storage bottle 200. In the non-use state, the guide column 61 on the middle cover 6 is located at the second end 121b of the guide groove 121 on the inner cover 1, the annular boss 63 is abutted against the limit platform 13, and the middle cover 6 is in a relatively lower position relative to the inner cover 1.

[0052] During use, the user needs to rotate the liquid transfer device 100 to release the threaded connection between it and the liquid storage bottle 200. During the rotation process, the liquid transfer device 100 can automatically absorb the liquid in the liquid storage bottle 200. The specific process is as follows:

[0053] Rotating the outer cover 7 will cause the middle cover 6 to rotate synchronously. The guide post 61 on the middle cover 6 moves along the guide groove 121 from the second end 121b to the first end 121a, causing the middle cover 6 to gradually move upward relative to the inner cover 1. During the upward movement of the middle cover 6, the elastic member 5 and the button 4 are driven upward together. The button 4 drives the piston 3 to move upward synchronously, thereby forming a negative pressure in the cavity 111. Under the action of the negative pressure, the liquid in the liquid storage bottle 200 is sucked into the tubular cavity 21 of the dropper 2. When the guide post 61 slides to the first end 121a, the protrusion 122 also slides to the end of the arc-shaped groove 71. At this time, the outer cover 7 is further rotated, and the outer cover 7 will drive the middle cover 6 and the inner cover 1 to rotate together, thereby releasing the threaded connection between the inner cover 1 and the liquid storage bottle 200, allowing the entire liquid transfer device 100 to be removed from the liquid storage bottle 200 and the dropper 2 to absorb the liquid.

[0054] Since the distance between the first end 121a and the second end 121b is fixed, during the entire rotational liquid aspiration process, the distance that the middle cover 6 moves upward relative to the inner cover 1 and the distance that the piston 3 moves upward in the cavity 111 are also fixed. Therefore, during each rotational liquid aspiration process, the volume of liquid aspirated is also fixed, thereby solving the problem of the user aspirating too much or too little liquid due to different pressing strengths each time.

[0055] The liquid pipetting device 100 is detached from the liquid storage bottle 200, and the guide column 61 thereon is located at the first end portion 121a. In this state, the liquid pipetting device 100 is similar to a common push-type pipetting device. The user only needs to press the button 4 downward to discharge the liquid in the lumen 21. At the same time, after the liquid is discharged, the user can also insert the dropper 2 into the liquid storage bottle 200 again, and by pressing the button 4 again, the button 4 drives the piston 3 to move downward and form a negative pressure in the cavity 111, and use the negative pressure to absorb the liquid in the liquid storage bottle 200 again.

[0056] When use is finished, the liquid pipetting device 100 is installed on the liquid storage bottle 200, the outer cover 7 is rotated, the protrusion 122 slides from one end of the arc groove 71 to the other end, and the guide post 61 slides from the first end 121a to the second end 121b. During this process, the outer cover 7 and the middle cover 6 will rotate relative to the inner cover 1 but will not drive the inner cover 1 to rotate. During this process, the middle cover 6 drives the elastic member 5, the button 4 and the piston 3 to return to the initial position downward. At this time, if there is still liquid in the lumen 21, the liquid will be discharged into the liquid storage bottle 200; when the guide post 61 moves to the second end 121b and the protrusion 122 moves to the other end of the arc groove 71, continue to rotate the outer cover 7, the rotation of the outer cover 7 will drive the inner cover 1 to rotate together, and realize the threaded connection between the inner cover 1 and the liquid storage bottle 200, thereby reinstalling the liquid pipetting device 100 on the liquid storage bottle 200.

[0057] In summary, when the liquid transfer device 100 of this embodiment is removed from a container such as a liquid storage bottle 200, the outer cover 7 is rotated, and the outer cover 7 drives the middle cover 6 to rotate together. The middle cover 6 moves upward relative to the inner cover 1 under the cooperation of the guide column 61 and the guide groove 121, and drives the piston 3 to move upward under the action of the elastic member 5 and the button 4, thereby realizing the absorption of liquid in a container such as a liquid storage bottle 200, which is more convenient for users to use and can also realize quantitative absorption of liquid.

[0058] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the essence of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A liquid transfer device, characterized in that: The liquid transfer device comprises: An inner cover, wherein the upper portion of the inner cover has a cavity; A dropper, the dropper extending in the up-down direction, the dropper fixedly mounted on the lower part of the inner cover, and the lumen of the dropper is communicated with the cavity; A piston, the piston is slidably disposed in the cavity, and the outer peripheral wall of the piston is sealed and connected to the inner peripheral wall of the cavity; A button is slidably arranged on the upper part of the inner cover in an up-down direction, and the button is fixedly connected to the piston; An elastic member capable of providing a force required for the button to move upward and away from the inner cover; A middle cover, which is sleeved on the outer side of the inner cover so as to be able to rotate relatively around its own axis and slide relatively in the up-down direction; The outer cover is sleeved on the outer sides of the middle cover and the inner cover, the outer cover is connected to the inner cover only by being rotatable about its own axis relative to the inner cover, and the outer cover is connected to the middle cover only by being slidable relative to the middle cover in the up-down direction, and at least a part of the upper part of the button can be exposed from the upper part of the outer cover, Among them, one of the inner circumferential surface of the middle cover and the outer circumferential surface of the inner cover is provided with a guide groove spirally ascending around the axis of the inner cover, and the other is provided with a guide part inserted in the guide groove in a sliding fit.

2. The liquid transfer device according to claim 1, characterized in that: The guide groove is arranged on the outer peripheral portion of the inner cover, and the guide portion is a guide column which protrudes and extends radially inward from the inner wall of the middle cover, and the guide column is inserted into the guide groove in a sliding manner.

3. The liquid transfer device according to claim 2, characterized in that: The guide groove has a first end and a second end which are arranged at two different ends in the length direction of the guide groove, the first end is higher than the second end, and during the movement of the guide column from the first end to the second end, the piston moves downward along the cavity so that the liquid transfer device can discharge liquid; during the movement of the guide column from the second end to the first end, the piston moves upward along the cavity so that the liquid transfer device can absorb liquid, and during the sliding of the guide column between the first end and the second end along the guide groove, the elastic member is always in an extended state.

4. The liquid transfer device according to claim 3, characterized in that: The guide groove is a spiral groove that spirally rises from the second end portion to the first end portion along the rotation center line of the inner cover.

5. The liquid transfer device according to claim 2, characterized in that: When the guide post slides from one end to the other end along the guide groove, the outer cover and the middle cover rotate together relative to the inner cover at an angle less than 180°.

6. The liquid transfer device according to claim 5, characterized in that: The lower part of the inner cover is provided with a protrusion extending radially outward, and the inner peripheral part of the outer cover is provided with an arc-shaped groove, in which the protrusion can be inserted in a sliding fit, wherein the arc of the arc-shaped groove is less than 180°.

7. The liquid transfer device according to any one of claims 1 to 6, characterized in that: The elastic member is a plastic member, and the elastic member is integrally formed at the lower part of the button.

8. The liquid transfer device according to claim 7, characterized in that: The elastic member comprises a connecting ring sleeved on the outer peripheral portion of the inner cover, and a plurality of elastic strips connected between the connecting ring and the button, and all the elastic strips spirally extend in the up-and-down direction with the axis of the button as the rotation center line.

9. The liquid transfer device according to claim 1, characterized in that: A guide and limit structure is provided between the outer wall of the middle cover and the inner wall of the outer cover, and the guide and limit structure is configured to limit the relative rotation of the two and to provide the two with relative sliding in the up and down directions.

10. The liquid transfer device according to claim 9, characterized in that: The guide and limiting structure comprises a vertical groove and a convex column which are extended in the up-down direction and slidably matched, and the vertical groove and the convex column are respectively arranged on the outer wall of the middle cover and the inner wall of the outer cover.

11. The liquid transfer device according to claim 1, characterized in that: The inner cover has an upper cover body and a lower cover body connected in the up-down direction, the cavity is arranged on the upper cover body, a connecting column extending in the up-down direction is fixedly arranged in the lower cover body, a through hole penetrating in the up-down direction is opened on the connecting column, the upper part of the dropper is fixedly connected to the connecting column, and the tube cavity of the dropper is communicated with the cavity through the through hole.

12. The liquid transfer device according to claim 11, characterized in that: The inner wall of the middle cover is provided with an annular boss extending radially inward, the elastic member is sleeved on the outer side of the upper cover body and presses downward against the annular boss, and a limit platform for limiting the downward movement of the annular boss is also formed between the upper cover body and the lower cover body.

13. The liquid transfer device according to claim 11, characterized in that: The inner cover is cooperatively connected with the middle cover and the outer cover through the lower cover body.

14. A cosmetic packaging container, comprising a liquid storage bottle, characterized in that: It also includes the liquid transfer device according to any one of claims 1 to 13, wherein the dropper is inserted into the liquid storage bottle, and the inner cover is threadedly connected to the liquid storage bottle.

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