Oral liquid bottle capable of subpackaging medicines

Abstract

The oral liquid bottle comprises a bottle body, a lower screw cap and an inner plug cap, the lower screw cap comprises an outer cylinder body and an inner cylinder body, a first annular cavity is formed between the upper portion of the outer cylinder body and the inner cylinder body, and an inclined guide hole is formed in the upper portion of the outer cylinder body; a medicine containing cavity is formed in the inner cylinder body, and a medicine outlet hole is formed in the bottom end of the medicine containing cavity; the inner plug cover comprises a rotating cylinder and an inner plug rod, a second annular cavity is formed between the rotating cylinder and the upper portion of the inner plug rod, a protruding block is arranged on the outer wall of the rotating cylinder, the rotating cylinder extends into the first annular cavity, and the protruding block extends into the inclined guide hole; the upper portion of the inner cylinder extends into the second annular cavity, and the inner plug rod is inserted into the medicine containing cavity and can be plugged into the medicine outlet hole or pulled out of the medicine outlet hole. Medicine and oral liquid can be subpackaged, the medicine and the oral liquid are mixed conveniently, the inner plug rod is used for blocking the medicine outlet hole or is pulled out of the medicine outlet hole, after the bottom of the inner plug rod is pulled out of the medicine outlet hole, the medicine outlet hole can be completely opened, and blocking is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oral liquid packaging containers, in particular to an oral liquid bottle capable of packaging medicines. Background Art

[0002] Currently, the caps of oral liquid bottles on the market are difficult to open, which makes them cumbersome to use and provides a poor user experience. They are all single pre-filled mixed liquids that can be drunk directly after opening the cap, making it difficult to solve the problem of adding powdered or concentrated drugs before drinking. Moreover, after some powdered or concentrated drugs are mixed with oral liquids, their state is unstable and their shelf life will be greatly shortened.

[0003] With technological advancements, bottle containers for packaging solid powders or concentrated liquids with water have gradually emerged. Referring to Chinese patent document CN107284838A, a bottle cap is disclosed, comprising a lower bottle cap and an upper bottle cap connected to the lower bottle cap, wherein the upper bottle cap is provided with a storage chamber for storing solid powders or concentrated liquids, the storage chamber having an opening at its lower end and a sealing film at the opening, the lower bottle cap comprising an upper connecting portion and a lower connecting portion, the upper connecting portion having an outer thread on its outer sidewall, and an inner thread on its inner sidewall cooperating with the outer thread, the upper bottle cap having an anti-counterfeiting limiting ring at its lower end that is anti-counterfeiting and capable of limiting downward movement of the upper bottle cap relative to the lower bottle cap, and the lower connecting portion having a piercing member that, when the anti-counterfeiting limiting ring is removed from the upper bottle cap, is rotated to cause the upper bottle cap to move downward relative to the lower bottle cap, thereby piercing the internal sealing film and allowing the solid powder or concentrated liquid in the storage chamber to mix smoothly with the solution in the bottle. However, the patent document CN107284838A still has the following technical problems: (1) During the puncture process of the sealing film, debris may still fall into the solution in the bottle; (2) When the puncture piece punctures the sealing film upward, it is easy to block the puncture hole of the sealing film, so that when the solid powder or concentrated liquid in the storage chamber falls from the puncture hole, it is easy to be affected by the puncture piece and difficult to fall into the bottle. Utility Model Content

[0004] The utility model aims to solve the technical problem of the above-mentioned deficiencies in the prior art and provides an oral liquid bottle capable of separately packaging medicines, wherein the oral liquid bottle can separately pack powdered medicines or concentrated liquid medicines and oral liquids, and the medicines can be dropped from the medicine receiving chamber into the bottle body by rotating the inner plug cover, so that the medicines and oral liquids are mixed, which is convenient to use; and the oral liquid bottle uses the bottom of the inner plug rod of the inner plug cover to block the medicine outlet hole, or to draw out the medicine receiving chamber from the medicine outlet hole to connect the medicine receiving chamber with the bottle body, without the need for a sealing film and a piercing member. After the bottom of the inner plug rod of the inner plug cover is drawn out from the medicine outlet hole, the medicine outlet hole can be fully opened, thereby avoiding the problem of blockage of the medicine outlet hole and allowing the medicine in the medicine receiving chamber to easily drop into the bottle body; the oral liquid bottle can also be turned over to allow the oral liquid in the bottle body to flow back from the medicine outlet hole to the medicine receiving chamber to mix with the medicine, and then the oral liquid bottle can be turned back and placed upright to allow the oral liquid mixed with the medicines to flow back from the medicine receiving chamber into the bottle body through the medicine outlet hole.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: an oral liquid bottle capable of dispensing medicine, comprising:

[0006] A bottle body, wherein the bottle body is used to contain the oral liquid, and a bottle body connecting portion is provided at the upper end of the bottle body;

[0007] The lower screw cap comprises an outer cylinder and an inner cylinder, wherein the outer cylinder is sleeved outside the inner cylinder, the middle portion of the outer cylinder is integrally connected to the middle portion of the inner cylinder, and the lower portion of the outer cylinder is detachably connected to the bottle body connection portion, a first annular cavity is provided between the upper portion of the outer cylinder and the inner cylinder, and an oblique guide hole is provided on the upper portion of the outer cylinder that passes through the inside and outside; a drug containing cavity is provided inside the inner cylinder, and a drug outlet hole is provided at the bottom end of the drug containing cavity;

[0008] An inner plug cover comprises an inner plug cover and an inner plug rod, the top end of the rotating cylinder and the top end of the inner plug rod are integrally connected, a second annular cavity is provided between the rotating cylinder and the upper part of the inner plug rod, the outer wall of the rotating cylinder is provided with a protrusion extending outward, the rotating cylinder can be rotatably extended into the first annular cavity, the protrusion extends into the oblique guide hole and can move along the oblique guide hole; the upper part of the inner cylinder body can be rotatably extended into the second annular cavity, the inner plug rod is inserted into the drug containing cavity of the inner cylinder body, and the bottom of the inner plug rod can be inserted into the drug outlet hole and block the drug outlet hole, or be pulled out from the drug outlet hole to connect the drug containing cavity with the bottle body.

[0009] Preferably, the bottle body connecting portion of the bottle body is provided with an external thread, the lower part of the outer cylinder of the lower screw cap is provided with an internal thread, a third annular cavity is provided between the lower part of the outer cylinder and the inner cylinder, the bottle body connecting portion extends into the third annular cavity, and the external thread of the bottle body connecting portion is threadedly connected with the internal thread of the inner cylinder.

[0010] Preferably, an annular connecting ring is provided at the connection between the middle portion of the outer cylinder and the middle portion of the inner cylinder, and the annular connecting ring isolates the first annular cavity and the third annular cavity from each other.

[0011] Preferably, two oppositely positioned oblique guide holes are provided on the upper part of the outer cylinder, and the outer wall of the rotating cylinder is provided with two protrusions corresponding to the oblique guide holes; the inner wall of the upper end of the outer cylinder is provided with two assembly notches corresponding to the oblique guide holes, and the lower end of the assembly notch is provided with a guide slope, and the protrusion can slide from the assembly notch through the guide slope and be assembled into the oblique guide hole.

[0012] Preferably, a sealing ring is provided on the upper outer wall of the inner plug rod, the outer side of the sealing ring being in contact with the upper inner wall of the inner cylinder and forming an interference fit. Furthermore, the sealing ring is integrally connected to the upper outer wall of the inner plug rod, and the number of sealing rings is 2-5, and the 2-5 sealing rings are spaced apart from each other.

[0013] Preferably, the lower portion of the inner plug rod is smaller than the upper portion of the inner plug rod, and a space for accommodating medicine is provided between the lower portion of the inner plug rod and the inner cavity wall of the medicine containing cavity.

[0014] Preferably, the oral liquid bottle capable of dispensing medication further comprises an upper screw cap, which is fitted over the upper end of the inner plug cap and has a circle of anti-slip grooves on its outer side. A central hole is axially defined in the middle of the inner plug rod of the inner plug cap, with the lower end of the central hole closed and the upper end open. The wall of the central hole has a uniform thickness, the upper end of the inner plug cap is provided with a circle of vertical external snap grooves, and the inner wall of the upper screw cap is provided with a circle of vertical internal snap grooves, the external snap grooves and the internal snap grooves being mutually engaged.

[0015] The beneficial effects of the present invention are as follows: (1) the bottle body of the present invention can be filled with oral liquid, and the medicine holding cavity in the inner cylinder of the lower screw cap can be filled with powder medicine or concentrated liquid medicine, so that the present invention can separately hold powder medicine or concentrated liquid medicine and oral liquid; (2) the present invention has an inclined guide hole that passes through the upper part of the outer cylinder of the lower screw cap, and the outer wall of the rotating cylinder of the inner plug cap is provided with a protrusion extending outward, and the rotating cylinder can be rotatably extended into the first annular cavity, and the protrusion extends into the inclined guide hole and can move along the inclined guide hole. Therefore, by rotating the inner plug cap, the protrusion can be moved along the inclined guide hole, thereby pushing the inner plug cap to rise or fall; when the protrusion is at the lowest end position of the inclined guide hole, the bottom of the inner plug rod of the inner plug cap is inserted into the medicine outlet hole and blocks the medicine outlet hole, and the powder medicine or concentrated liquid medicine in the medicine holding cavity is isolated from the oral liquid in the bottle body; when the inner plug cap is rotated, the inner plug cap is rotated. When the plug cover is plugged and the protrusion moves upward along the oblique guide hole, the inner plug cover is pushed up, and the bottom of the inner plug rod of the inner plug cover is pulled out from the medicine outlet hole, so that the medicine containing chamber is connected with the bottle body, and then the medicine is dropped from the medicine containing chamber into the bottle body, so that the medicine is mixed with the oral liquid, which is convenient to use; (3) The utility model uses the bottom of the inner plug rod of the inner plug cover to block the medicine outlet hole, or pull it out from the medicine outlet hole to connect the medicine containing chamber with the bottle body, without the need to set a sealing film and a puncture part. After the bottom of the inner plug rod is pulled out from the medicine outlet hole, the medicine outlet hole can be fully opened, avoiding the problem of blockage of the medicine outlet hole, so that the medicine in the medicine containing chamber can easily fall into the bottle body; the oral liquid bottle can also be turned over to allow the oral liquid in the bottle body to flow back from the medicine outlet hole to the medicine containing chamber and mix with the medicine, and then the oral liquid bottle is turned back and placed upright to allow the oral liquid mixed with the medicine to flow back from the medicine containing chamber through the medicine outlet hole into the bottle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the utility model when the medicine outlet is in a closed state.

[0017] Figure 2 This is a longitudinal sectional structural diagram of the utility model when the medicine outlet hole is in a closed state.

[0018] Figure 3 for Figure 2 A partial enlarged view of part A.

[0019] Figure 4 This is one of the dispersed structure diagrams of the present utility model.

[0020] Figure 5 for Figure 4 A partial enlarged view of part B.

[0021] Figure 6 This is the second dispersed structure diagram of the present utility model.

[0022] Figure 7 This is the overall structural diagram of the utility model when the medicine outlet hole is in the open state.

[0023] Figure 8 This is a longitudinal sectional structural diagram of the utility model when the medicine outlet hole is in an open state. DETAILED DESCRIPTION

[0024] The structural principle and working principle of the present invention are further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-8 As shown, the utility model is an oral liquid bottle capable of dispensing medicine, comprising a bottle body 1, a lower screw cap 2 and an inner plug cap 3; the bottle body 1 is used to contain oral liquid, and the upper end of the bottle body 1 is provided with a bottle body connecting portion 11; the lower screw cap 2 comprises an outer cylinder 21 and an inner cylinder 22, the outer cylinder 21 is sleeved outside the inner cylinder 22, the middle part of the outer cylinder 21 is integrally connected with the middle part of the inner cylinder 22, the lower part of the outer cylinder 21 is detachably connected to the bottle body connecting portion 11, a first annular cavity 24 is provided between the upper part of the outer cylinder 21 and the inner cylinder 22, and an oblique guide hole 25 is opened on the upper part of the outer cylinder 21, which is passed through inside and outside; a medicine receiving chamber 26 is provided inside the inner cylinder 22, and a medicine outlet hole 27 is provided at the bottom end of the medicine receiving chamber 26; the inner plug cap 3 comprises a screw cap 21; the screw cap 21 is provided with a screw cap 25 ... The top of the rotating cylinder 31 and the top of the inner plug rod 32 are integrally connected. A second annular cavity 33 is provided between the rotating cylinder 31 and the upper part of the inner plug rod 32. The outer wall of the rotating cylinder 31 is provided with a protrusion 34 extending outward. The rotating cylinder 31 can be rotatably extended into the first annular cavity 24, and the protrusion 34 extends into the inclined guide hole 25 and can move along the inclined guide hole 25; the upper part of the inner cylinder body 22 can be rotatably extended into the second annular cavity 33, and the inner plug rod 32 is inserted into the drug containing cavity 26 of the inner cylinder body 22. The bottom of the inner plug rod 32 can be inserted into the drug outlet hole 27 and block the drug outlet hole 27, or be withdrawn from the drug outlet hole 27 to connect the drug containing cavity 26 with the bottle body 1.

[0026] The bottle body 1 of the present invention can be filled with oral liquid, and the medicine receiving chamber 26 in the inner cylinder 22 of the lower screw cap 2 can be filled with powder medicine or concentrated liquid medicine, so that the present invention can separately contain powder medicine or concentrated liquid medicine and oral liquid; the present invention can rotate the inner plug cover 3 to make the protrusion 34 move along the oblique guide hole 25, thereby pushing the inner plug cover 3 to rise or fall; when the protrusion 34 is at the lower end position of the oblique guide hole 25, the bottom of the inner plug rod 32 of the inner plug cover 3 is inserted into the medicine outlet hole 27 and blocks the medicine outlet hole 27, and the medicine outlet hole 27 is in a closed state (see Figure 2), the powdered medicine or concentrated liquid medicine in the medicine receiving chamber 26 is isolated from the oral liquid in the bottle body 1, and the powdered medicine or concentrated liquid medicine in the medicine receiving chamber 26 cannot fall into the bottle body 1; when the inner plug cover 3 is rotated and the protrusion 34 moves upward along the inclined guide hole 25, the inner plug cover 3 is pushed up, the medicine outlet 27 is opened, and the bottom of the inner plug rod 32 of the inner plug cover 3 is withdrawn from the medicine outlet 27, so that the medicine receiving chamber 26 is connected with the bottle body 1 (see Figure 8 ), and then the medicine falls from the medicine receiving chamber 26 into the bottle body 1, so that the medicine is mixed with the oral liquid, which is convenient to use; the utility model utilizes the bottom of the inner plug rod 32 of the inner plug cover 3 to block the medicine outlet hole 27, or to draw it out from the medicine outlet hole 27 to connect the medicine receiving chamber 26 with the bottle body 1, without the need to set a sealing film and a piercing member. After the bottom of the inner plug rod 32 is drawn out from the medicine outlet hole 27, the medicine outlet hole 27 can be fully opened, avoiding the problem of blockage of the medicine outlet hole 27, so that the medicine in the medicine receiving chamber 26 can easily fall into inside the bottle body 1; the oral liquid bottle can also be turned upside down with the bottle body 1 facing upward, so that the oral liquid in the bottle body 1 can flow back from the medicine outlet hole 27 to the medicine receiving chamber 26 to mix with the medicine. During this process, the bottle body can be shaken several times to fully mix the medicine and the oral liquid. Then, the oral liquid bottle can be turned back and placed upright with the bottle body facing downward, so that the oral liquid mixed with the medicine can flow back from the medicine receiving chamber 26 through the medicine outlet hole 27 into the bottle body 1; finally, the user unscrews the lower screw cap 2 from the bottle body 1 to open it, and then the oral liquid in the bottle can be taken.

[0027] like Figure 2 、 Figure 4 、 Figure 6 and Figure 8 As shown, the bottle body 1 has an external thread on its connecting portion 11, and the lower portion of the outer cylinder 21 of the lower screw cap 2 has an internal thread. A third annular cavity 28 is defined between the lower portion of the outer cylinder 21 and the inner cylinder 22. The bottle body connecting portion 11 extends into the third annular cavity 28, and the external thread of the bottle body connecting portion 11 is threadedly engaged with the internal thread of the inner cylinder 22. An annular connecting ring 23 is provided at the junction between the middle portion of the outer cylinder 21 and the middle portion of the inner cylinder 22. The annular connecting ring 23 separates the first annular cavity 24 from the third annular cavity 28. When the bottle body connecting portion 11 extends into the third annular cavity 28 and connects to the lower portion of the outer cylinder 21, the annular connecting ring 23 also provides a good sealing effect.

[0028] like Figure 1 、 Figure 2 、 Figure 4-Figure 8As shown, the upper portion of the outer cylinder 21 is provided with two opposing oblique guide holes 25, and the outer wall of the rotating cylinder 31 is provided with two protrusions 34 corresponding to the oblique guide holes 25. The inner wall of the upper end of the outer cylinder 21 is provided with two assembly notches 29 corresponding to the oblique guide holes 25, and the lower ends of the assembly notches 29 are provided with guide slopes 291, so that the protrusions 34 can slide through the assembly notches 29, pass through the guide slopes 291, and fit into the oblique guide holes 25. When installing the inner plug cover 3, first insert the inner plug cover 3 into the inner cylinder 22 of the lower screw cap 2; then align the protrusions 34 of the inner plug cover 3 with the assembly notches 29 on the outer cylinder 21 of the lower screw cap 2; then, press the inner plug cover 3 downward with a slight force, so that the protrusions 34 of the inner plug cover 3 push the outer cylinder 21 downward, slide through the guide slopes 291, and fit into the oblique guide holes 25, making assembly convenient.

[0029] like Figure 2 、 Figure 3 and Figure 8 As shown, a sealing ring 35 is provided on the upper outer wall of the inner plug rod 32. The outer side of the sealing ring 35 contacts and forms an interference fit with the upper inner wall of the inner cylinder 22. The sealing ring 35 seals the upper end of the drug-holding chamber 26, preventing powdered or concentrated drug from escaping from the gap between the inner plug rod 32 and the inner cylinder 22, and preventing outside air from entering the drug-holding chamber 26 through the gap between the inner plug rod 32 and the inner cylinder 22. As a preferred embodiment of the sealing ring 35, the sealing ring 35 is integrally connected to the upper outer wall of the inner plug rod 32. The number of sealing rings 35 is 2-5, and the 2-5 sealing rings 35 are spaced apart from each other to achieve a very good sealing effect. More preferably, the number of sealing rings 35 is 3.

[0030] like Figure 2 、 Figure 4 、 Figure 6 and Figure 8 As shown, the lower portion of the inner plug rod 32 is smaller than the upper portion of the inner plug rod 32 , and there is a space for accommodating medicine between the lower portion of the inner plug rod 32 and the inner cavity wall of the medicine containing cavity 26 .

[0031] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 6-Figure 8As shown, the oral liquid bottle also includes an upper screw cap 4, which is covered on the outside of the upper end of the inner plug cap 3. The outer side of the upper screw cap 4 is provided with a circle of anti-slip grooves 41; the inner plug rod 32 of the inner plug cap 3 is axially provided with a middle hole 36, the lower end of the middle hole 36 is closed and the upper end is open. The main purpose of providing the upper screw cap 4 is to allow the inner plug cap 3 to be formed into a hollow structure, which is convenient for injection molding of the inner plug cap 3. Furthermore, the hole wall thickness of the middle hole 36 is uniform, the upper end of the inner plug cap 3 is provided with a circle of vertical external snap grooves 37, and the inner wall of the upper screw cap 4 is provided with a circle of vertical internal snap grooves 42, and the external snap grooves 37 and the internal snap grooves 42 are snapped together. The advantage of the inner plug cover 3 adopting a hollow structure with uniform hole wall thickness is that after injection molding, the surface of the inner plug rod 32 of the inner plug cover 3 can be made uniform and smooth, and the sealing effect between the inner plug rod 32 and the inner cylinder 22 and the drug outlet 27 is good; if a solid inner plug rod 32 is used, then after the solid inner plug rod 32 is molded and cooled, there will be a large shrinkage deformation, the appearance becomes uneven, and the sealing problem will occur.

[0032] As a preferred embodiment of the present invention, the bottle body 1, the lower screw cap 2, the inner plug cap 3 and the upper screw cap 4 are all made of PP material, which has an excellent sealing effect and can be recycled to reduce the waste of outer packaging materials.

[0033] The above description is only a preferred embodiment of the present invention. Any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. An oral liquid bottle capable of dispensing medicine, characterized in that: include: A bottle body, wherein the bottle body is used to contain the oral liquid, and a bottle body connecting portion is provided at the upper end of the bottle body; The lower screw cap comprises an outer cylinder and an inner cylinder, wherein the outer cylinder is sleeved outside the inner cylinder, the middle portion of the outer cylinder is integrally connected to the middle portion of the inner cylinder, and the lower portion of the outer cylinder is detachably connected to the bottle body connection portion, a first annular cavity is provided between the upper portion of the outer cylinder and the inner cylinder, and an oblique guide hole is provided on the upper portion of the outer cylinder that passes through the inside and outside; a drug containing cavity is provided inside the inner cylinder, and a drug outlet hole is provided at the bottom end of the drug containing cavity; An inner plug cover, the inner plug cover includes a rotating cylinder and an inner plug rod, the top end of the rotating cylinder and the top end of the inner plug rod are integrally connected, a second annular cavity is provided between the rotating cylinder and the upper part of the inner plug rod, the outer wall of the rotating cylinder is provided with a protrusion extending outward, the rotating cylinder can be rotatably extended into the first annular cavity, the protrusion extends into the oblique guide hole and can move along the oblique guide hole; the upper part of the inner cylinder body can be rotatably extended into the second annular cavity, the inner plug rod is inserted into the drug containing cavity of the inner cylinder body, and the bottom of the inner plug rod can be inserted into the drug outlet hole to block the drug outlet hole, or drawn out from the drug outlet hole to connect the drug containing cavity with the bottle body; A sealing ring is provided on the upper outer wall of the inner plug rod, and the outer side of the sealing ring contacts and interference fits with the upper inner wall of the inner cylinder; the lower part of the inner plug rod is smaller than the upper part of the inner plug rod, and there is a space for accommodating medicine between the lower part of the inner plug rod and the inner wall of the medicine containing chamber.

2. The oral liquid bottle capable of dispensing medicine according to claim 1, characterized in that: The bottle body connecting part of the bottle body is provided with an external thread, the lower part of the outer cylinder of the lower screw cap is provided with an internal thread, a third annular cavity is provided between the lower part of the outer cylinder and the inner cylinder, the bottle body connecting part extends into the third annular cavity, and the external thread of the bottle body connecting part is threadedly connected with the internal thread of the inner cylinder.

3. The oral liquid bottle capable of dispensing medicine according to claim 2, characterized in that: An annular connecting ring is provided at the connection between the middle portion of the outer cylinder and the middle portion of the inner cylinder, and the annular connecting ring isolates the first annular cavity and the third annular cavity from each other.

4. The oral liquid bottle capable of dispensing medicine according to claim 1, characterized in that: The upper part of the outer cylinder is provided with two oppositely positioned oblique guide holes, and the outer wall of the rotating cylinder is provided with two protrusions corresponding to the oblique guide holes; the inner wall of the upper end of the outer cylinder is provided with two assembly notches corresponding to the oblique guide holes, and the lower end of the assembly notch is provided with a guide inclined surface, and the protrusion can slide from the assembly notch through the guide inclined surface and be assembled into the oblique guide hole.

5. The oral liquid bottle capable of dispensing medicine according to claim 1, characterized in that: The sealing ring is integrally connected to the upper outer wall of the inner plug rod. The number of the sealing rings is 2-5, and the 2-5 sealing rings are arranged at intervals from each other.

6. The oral liquid bottle capable of dispensing medicine according to any one of claims 1 to 5, characterized in that: It also includes an upper screw cover, which is covered on the outside of the upper end of the inner plug cover, and the outer side of the upper screw cover is provided with a circle of anti-slip grooves; a middle hole is axially provided in the middle of the inner plug rod of the inner plug cover, the lower end of the middle hole is closed and the upper end is open.

7. The oral liquid bottle capable of dispensing medicine according to claim 6, characterized in that: The wall thickness of the middle hole is uniform. A circle of vertical outer snap grooves is provided on the outer side of the upper end of the inner plug cover, and a circle of vertical inner snap grooves is provided on the inner wall of the upper screw cover. The outer snap grooves and the inner snap grooves are snapped into each other.

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