Connecting structure and container with same

Abstract

The invention discloses a connecting structure and a container with the connecting structure. The connecting structure comprises a hollow upper connecting part and a hollow lower connecting part. And the upper connecting part and the lower connecting part have the same section shape, so that one axial end of the upper connecting part can be connected with one axial end of the lower connecting part along the axial direction. A plurality of protruding parts protruding inwards in the radial direction are evenly distributed on the surface of the inner circumferential wall of the upper connecting part in the same axial position in the circumferential direction, and a first annular protruding part and a second annular protruding part which protrude outwards in the radial direction and are perpendicular to the axis are sequentially arranged on the surface of the outer circumferential wall of one axial end of the lower connecting part in the axial direction. The first annular protruding part and the second annular protruding part are parallel in the axial direction, and an annular guide groove is formed between the first annular protruding part and the second annular protruding part in the axial direction. The upper connecting part and the lower connecting part can be contained in the guide groove through the protruding part or can be connected in the mode that the protruding part only abuts against the second annular protruding part in the axial direction. The connecting structure is simple in structure and convenient to operate.

Description

Technical Field

[0001] The present application relates to the technical field of article storage, and in particular to a connection structure and a container having the connection structure. Background Art

[0002] Typically, a container comprises a lid and a container body, wherein the lid can be separated from or combined with the container body via a connection structure to open or close the container. The connection structure also has a locking function to lock the lid and the container body to prevent the container from being opened.

[0003] Furthermore, the storage space of containers is limited, so their connection structure should be simple and easy to operate. On the other hand, for containers with certain specific uses, such as those used to store toxic, hazardous, or corrosive substances, or medicines, specific operating steps are required to unlock the connection structure to prevent it from being easily opened by certain groups of people, such as children.

[0004] Therefore, it is necessary to provide a connection structure that is simple in structure and can prevent the container from being opened by mistake. Summary of the Invention

[0005] The purpose of the present application is to provide a connection structure that is simple in structure and can effectively prevent accidental separation. In addition, the present application also provides a container having the connection structure.

[0006] The connection structure according to the present application includes: an upper connection part; and a lower connection part. The upper connection part and the lower connection part are hollow in shape, and the cross-sectional shape of the upper connection part is the same as the cross-sectional shape of the lower connection part, and one axial end of the upper connection part can be connected axially to one axial end of the lower connection part. The inner circumferential wall surface of the upper connection part is uniformly distributed with a plurality of protrusions protruding radially inward at the same axial position along the circumferential direction. A first annular protrusion and a second annular protrusion protruding radially outward and perpendicular to the axis are sequentially provided on the outer circumferential wall surface of one axial end of the lower connection part in the axial direction, and the first annular protrusion and the second annular protrusion are parallel to each other in the axial direction and an annular guide groove is formed between the two in the axial direction. The upper connection part is connected to the lower connection part by the protrusion being accommodated in the guide groove or by the protrusion only axially abutting against the second annular protrusion.

[0007] In one embodiment, when the protrusion is accommodated in the guide groove, the first annular protrusion and the second annular protrusion respectively limit the protrusion axially from both axial sides; when the protrusion is accommodated in the guide groove, the protrusion can slide circumferentially along the guide groove on the outer peripheral wall surface of the lower connecting part.

[0008] In one embodiment, the axial cross-section of each protrusion is a symmetrical inclined surface or an arc surface, and the axial cross-sections of the first and second annular protrusions are formed so that the cross-section of the guide groove corresponds to the axial cross-section of the protrusions.

[0009] In one embodiment, the first annular protrusion is provided with a plurality of openings at equal intervals along the circumferential direction, and the number of the openings is the same as the number of the protrusions; the circumferential length of each opening is greater than that of the protrusion, so that the protrusion can move axially through the corresponding opening.

[0010] In one embodiment, an axially extending baffle is provided on one circumferential side of each opening portion, and the baffle axially extends from the first annular protrusion toward the second annular protrusion and continues to axially extend for a certain length after reaching the second annular protrusion.

[0011] In one embodiment, an axial stop portion is provided on the outer peripheral wall surface of the lower connecting portion, and the second annular protrusion is axially located between the axial stop portion and the first annular protrusion; the axial distance between the axial stop portion and the second annular protrusion is equal to the axial distance between the axial end of the upper connecting portion combined with the lower connecting portion and the protrusion.

[0012] In one embodiment, the axial stop portion is annular and protrudes radially outward and away from the first annular protrusion.

[0013] In one embodiment, the peripheral wall of the upper connecting part is provided with a radially inwardly curved shoulder at the other axial end of the upper connecting part, and the axial distance between the shoulder and the protrusion is equal to the axial distance from the axial end of the lower connecting part combined with the upper connecting part to the second annular protrusion.

[0014] In one embodiment, the upper connecting portion and the lower connecting portion are made of flexible material.

[0015] In one embodiment, the shoulder is provided with a flexible annular sealing lip extending obliquely inward for a certain length along the entire circumference, and an annular sealing groove is provided along the entire circumference of the first annular protrusion. The sealing lip and the sealing groove have a mutually matching structure, and after the upper connecting portion is combined with the lower connecting portion, the sealing lip is combined with the sealing groove.

[0016] The present application also provides a container comprising: a lid; a container body; and a connection structure according to the present application. The lid and the container body each have an axially open end and an axially closed end; the upper connection portion is disposed at the axially open end of the lid, and the lower connection portion is disposed at the axially open end of the container body. The connection structure axially connects the axially open end of the lid and the axially open end of the container body to form a closed storage space.

[0017] In one embodiment, an annular groove or an annular fin is provided on the outer end surface of the axially closed end of the cover, and an annular fin or annular groove is provided on the outer end surface of the axially closed end of the container body; the annular groove or annular fin of the cover corresponds to the position and shape of the annular fin or annular groove of the container body, so that when multiple identical containers are axially stacked, the annular groove or annular fin of the cover of one container cooperates with the annular fin or annular groove of the container body of another container.

[0018] In the connection structure according to the embodiment of the present application and the container having the connection structure, the upper connection part can be combined with the lower connection part by pressing and realize two-level locking, thereby ensuring that the connection structure is more stable, and the structure is simple and easy to operate. Secondly, when separating the connection structure, two different operations are required to release the secondary locking and primary locking states respectively, thereby increasing the complexity of the operation when opening the container provided with a separation connection structure, which can effectively prevent the container from being opened by mistake. In addition, the container is provided with mutually matching annular grooves and annular fins on the closed end faces of the cover and the container body, respectively, which can maintain the stability of multiple containers stacked, thereby better meeting the flexibility requirements of stacking and storing multiple containers. In addition, since the connection structure of the present application is also provided with mutually matching sealing lips and sealing grooves, the container provided with the connection structure can achieve a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 is a schematic three-dimensional diagram of a container according to an embodiment of the present application;

[0021] Figure 2 is a schematic three-dimensional diagram of an upper connecting portion according to an embodiment of the present application;

[0022] Figure 3is a schematic three-dimensional diagram of a lower connecting portion according to an embodiment of the present application;

[0023] Figure 4 is a schematic top view of a container according to an embodiment of the present application, wherein the upper connecting portion and the lower connecting portion are connected together in a secondary locking state;

[0024] Figure 5 For the container according to the embodiment of the present application Figure 4 A cross-sectional view taken along line AA in FIG, wherein the upper connecting portion and the lower connecting portion are connected together in a secondary locked state;

[0025] Figure 6 is a schematic diagram of two containers stacked one on top of the other according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the steps for separating the upper connecting portion and the lower connecting portion according to an embodiment of the present application;

[0027] Figure 8 A schematic diagram of steps for connecting an upper connecting portion and a lower connecting portion according to an embodiment of the present application;

[0028] Figure 9 Schematic diagram of the sealing structure of the upper connecting portion and the lower connecting portion in a primary locking state according to an embodiment of the present application;

[0029] Figure 10 This is a schematic diagram of the sealing structure in which the upper connecting part and the lower connecting part are in a secondary locking state according to an embodiment of the present application.

[0030] In the picture:

[0031] 1 container, 11 lid, 21 container body;

[0032] 10 connection structure;

[0033] 100 upper connecting portion, 101 protruding portion, 102 shoulder portion, 1021 sealing lip, 111 annular groove;

[0034] 200 lower connecting portion, 201 first annular protrusion, 2011 sealing groove, 202 second annular protrusion, 203 guide groove, 204 opening, 205 baffle, 206 axial stopper, 211 annular fin. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0036] Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.

[0037] In one embodiment of the present application, a connection structure 10 is provided. Figures 1 to 3 , the connection structure 10 includes an upper connection part 100 and a lower connection part 200. The upper connection part 100 and the lower connection part 200 can be separated and connected to each other, and can achieve two-stage locking after connection. The upper connection part 100 and the lower connection part 200 can both be hollow in shape. In this embodiment, the upper connection part 100 and the lower connection part 200 are both hollow cylindrical, and the maximum inner diameter of the axial cross-section of the upper connection part 100 corresponds to the maximum outer diameter of the axial cross-section of the lower connection part 200, so that one end of the upper connection part 100 along its central axis and one end of the lower connection part 200 along its central axis can be axially connected together, and after combination, the central axis of the upper connection part 100 coincides with that of the lower connection part 200. Of course, the upper connection part 100 and the lower connection part 200 can also be other hollow shapes, as long as the cross-sectional shape and size of the two are consistent, and this application does not limit them.

[0038] In addition, the upper connecting portion 100 and the lower connecting portion 200 may be made of a flexible material, and thus can be elastically deformed when subjected to force.

[0039] like Figure 2 As shown, the inner peripheral wall surface of the upper connecting portion 100 has a plurality of protrusions 101 uniformly distributed along the circumference at the same axial position of the upper connecting portion 100, for example, six. The axial middle portion of each protrusion 101 protrudes radially inward from the inner peripheral wall surface and has a circumferential length. The radially closest point of each protrusion 101 from the central axis to the inner peripheral wall surface of the upper connecting portion 100 can be a symmetrical shape, for example, a symmetrical inclined surface or arc surface shape. In addition, especially as Figure 5 As shown, the other axial end of the peripheral wall of the upper connecting portion 100 may be provided with an inwardly bent shoulder 102 .

[0040] like Figure 3As shown, the outer circumferential surface of the axial end of the lower connecting portion 200 connected to the upper connecting portion 100 is provided with a first annular protrusion 201 and a second annular protrusion 202, which protrude radially outward and are perpendicular to the axis. The first annular protrusion 201 and the second annular protrusion 202 are axially parallel to each other and form an annular guide groove 203 between them. The axial cross-sections of the first annular protrusion 201 and the second annular protrusion 202 are formed so that the guide groove 203 matches the axial cross-section of the protrusion 101. The axial dimension of the guide groove 203 can be slightly larger than that of the protrusion 101. In this way, after the upper connecting portion 100 and the lower connecting portion 200 are connected, the protrusion 101 can be accommodated in the guide groove 203 and can slide circumferentially on the outer circumferential surface of the lower connecting portion 200 within the guide groove 203. Furthermore, the first annular protrusion 201 and the second annular protrusion 202 can axially limit the protrusion 101 from both sides.

[0041] In addition, Figure 3 As shown, the first annular protrusion 201 may be provided with a plurality of openings 204 spaced evenly along the circumference. The number of openings 204 is the same as the number of protrusions 101, for example, six. Furthermore, the circumferential length of each opening 204 may be slightly greater than that of the protrusion 101, allowing the protrusion 101 to move axially through the corresponding opening 204.

[0042] In addition, on one circumferential side of each opening portion 204 (for example, Figure 3 An axially extending baffle 205 is provided (circumferentially on the right side in the middle). The baffle 205 extends axially from the first annular protrusion 201 toward the second annular protrusion 202. After reaching the second annular protrusion 202, it may continue to extend axially for a certain length, for example, at least greater than half the axial dimension of the protrusion 101. Because the axial length of the baffle 205 exceeds the axial distance between the first annular protrusion 201 and the second annular protrusion 202, the baffle 205 not only limits the circumferential sliding position of the protrusion 101 in the guide groove 203, but also further limits the circumferential position of the protrusion 101 when the upper connecting portion 100 and the lower connecting portion 200 are connected in a two-stage locking state.

[0043] like Figure 3 、 5 As shown in Figures 7 and 8, an axial stopper 206 is provided on the outer peripheral wall surface of the lower connecting portion 200 at the other axial end away from the guide groove 203, and the second annular protrusion 202 is axially located between the axial stopper 206 and the first annular protrusion 201. In one embodiment, as Figure 5 、 7As shown in FIG8 , the axial distance between the axial stop portion 206 and the second annular protrusion 202 is set to be approximately equal to the axial distance between the axial end of the upper connecting portion 100 combined with the lower connecting portion 200 and the protrusion 101, and the axial distance between the shoulder portion 102 and the protrusion 101 is approximately equal to the axial distance between the axial end of the lower connecting portion 200 combined with the upper connecting portion 100 and the second annular protrusion 202. In this way, as Figure 5 As shown, the shoulder 102 and the protrusion 101 abut against the first annular protrusion 201 and the second annular protrusion 202 from both axial sides, which is defined as the secondary locking of the upper connecting part 100 and the lower connecting part 200. In the secondary locking state, the connection between the upper connecting part 100 and the lower connecting part 200 can be maintained more firmly.

[0044] like Figure 5 As shown, the axial stop portion 206 is annular and protrudes radially outward and away from the first annular protrusion 201, forming a cross-sectional shape that is inclined away from the first annular protrusion 201. Thus, when the upper connecting portion 100 and the lower connecting portion 200 are connected in a two-stage locking state, the axial end of the upper connecting portion 100 that is coupled to the lower connecting portion 200 contacts the axial stop portion 206, thereby limiting the axial position of the protrusion 101.

[0045] The following will be combined with the attached Figure 7 and 8 To illustrate the connection and separation process of the upper connecting portion 100 and the lower connecting portion 200. Figure 7 and 8 In the embodiment, part of the peripheral wall of the upper connecting portion 100 is removed.

[0046] When the upper connecting portion 100 needs to be connected to the lower connecting portion 200, as shown in FIG. Figure 8As shown, the axial end of the upper connecting portion 100 that is coupled to the lower connecting portion 200 is first pushed axially toward the axial end of the lower connecting portion 200 until the protrusion 101 first contacts the first annular protrusion 201 of the lower connecting portion 200 in the axial direction and is axially stopped by it. At this point, the upper connecting portion 100 is further pushed. The protrusion 101 is resisted by the first annular protrusion 201, causing the circumferential wall of the upper connecting portion 100 to elastically deform and expand radially outward. Simultaneously, under the action of the reaction force, the lower connecting portion 200 also deforms radially inward, causing the protrusion 101 to axially move across the first annular protrusion 201 and enter the guide groove 203. At this point, the axial sides of the protrusion 101 are respectively restrained by the first annular protrusion 201 and the second annular protrusion 202, thus preliminarily connecting the upper connecting portion 100 and the lower connecting portion 200. This is defined as the primary locking of the upper connecting portion 100 and the lower connecting portion 200. In the first-level locking state, the protrusion 101 can rotate circumferentially in the guide groove 203. When the protrusion 101 of the upper connecting part 100 is aligned with the opening 204 set on the first annular protrusion 201, the protrusion 101 can pass through the opening 204 and move out of the guide groove 203 in the axial reverse direction, thereby realizing the separation of the upper connecting part 100 and the lower connecting part 200.

[0047] When the upper connecting part 100 continues to be pushed toward the lower connecting part 200, the protrusion 101 moves axially across the second annular protrusion 202 due to elastic deformation. At this time, the upper connecting part 100 further moves axially for a distance. In this way, the first annular protrusion 201 and the second annular protrusion 202 are located in the space axially between the protrusion 101 and the shoulder 102, the first annular protrusion 201 axially abuts against the shoulder 102, and the second annular protrusion 202 axially abuts against the protrusion 101. At this time, the upper connecting part 100 and the lower connecting part 200 are snap-fitted and cannot move axially relative to each other. The upper connecting part 100 and the lower connecting part 200 complete the final connection and achieve secondary locking. In the secondary locking state, the axial end of the upper connecting part 100 that is combined with the lower connecting part 200 contacts the axial stop 206.

[0048] As can be seen from the above, the upper connecting part 100 can be combined with the lower connecting part 200 to achieve two-level locking, thereby ensuring that the connection structure of the present application is more stable, simple in structure, and easy to operate.

[0049] When it is necessary to separate the upper connecting portion 100 from the lower connecting portion 200 in the secondary locking state, Figure 7As shown, the circumferential wall of the upper connecting portion 100 at the end near the axial stop 206 is first radially pressed. Because the axial end of the upper connecting portion 100 that is coupled to the lower connecting portion 200 contacts the axial stop 206, and the axial stop 206 is inclined toward the end away from the guide groove 203, the circumferential wall at this end moves radially inward along the inclined surface of the axial stop 206, causing the circumferential wall of the middle portion of the upper connecting portion 100 to elastically deform and expand radially outward, thereby causing the protrusion 101 to move radially outward. Furthermore, the circumferential wall of the upper connecting portion 100 elastically deforms due to the resistance of the second annular protrusion 202, further promoting the axial movement of the upper connecting portion 100 toward the first annular protrusion 201. Under the combined action of these two factors, the protrusion 101 moves axially in the opposite direction, crossing the abutting second annular protrusion 202 and moving into the guide groove 203, thereby releasing the secondary locking state between the upper connecting portion 100 and the lower connecting portion 200. However, at this time, the upper connecting portion 100 is still connected to the lower connecting portion 200 and is in a first-level locking state.

[0050] Next, to release the primary locking state and separate the upper connecting portion 100 from the lower connecting portion 200, the upper connecting portion 100 is rotated circumferentially relative to the lower connecting portion 200 toward the opening 204 until the protrusion 101 is axially aligned with the opening 204. At this point, the upper connecting portion 100 is stopped from rotating and axially moved so that the protrusion 101 passes through the opening 204, thereby releasing the primary locking state and completely separating the upper connecting portion 100 from the lower connecting portion 200. Furthermore, because a stopper 205 is provided circumferentially on one side of the opening 204, when the protrusion 101 rotates within the guide groove 203 until it is circumferentially blocked by the stopper 205 and cannot rotate further, a user signal is provided indicating that the protrusion 101 is aligned with the opening 204. Therefore, the stopper 205 further helps maintain the alignment of the protrusion 101 with the opening 204, making it easier for the user to remove the protrusion 101 from the opening 204.

[0051] As can be seen from the above, according to the connection structure 10 of the present application, when it is necessary to separate the upper connection part 100 in the secondary locking state from the lower connection part 200, two different operations of squeezing and rotating are required, thereby increasing the operational complexity of separating the connection structure 10 and effectively preventing the connection structure 10 from being separated by mistake.

[0052] In one embodiment of the present application, a container 1 is provided, which is provided with a connection structure 10 according to the present application. Figure 1As shown, the container 1 comprises a lid 11 and a container body 21. Both the lid 11 and the container body 21 are cylindrical and have an axially open end and an axially closed end. The upper connecting portion 100 can be disposed at the open end of the lid 11, and the lower connecting portion 200 can be disposed at the open end of the container body 21. Thus, the lid 11 and the container body 21 are combined together via the connecting structure 10 to form a closed storage space. Because the container 1 has a connecting structure 10 capable of achieving a secondary locking function, the complexity of the opening operation is increased, thereby providing the advantage of preventing accidental opening.

[0053] In one embodiment, Figure 6 As shown, an annular axial groove 111 may be provided on the outer end surface of the axially closed end of the cover portion 11, and a corresponding annular fin 211 may be provided on the outer end surface of the axially closed end of the container body 21. The axial fin 211 axially protrudes from the axially closed end of the container body 21. Through the above structure, when multiple identical containers 1 are axially stacked, the cooperation between the annular groove 111 and the annular fin 211 can maintain the stability of the stack, better meeting the stability requirements when stacking multiple containers 1. Of course, in an embodiment not shown, an annular axial fin may also be provided on the outer end surface of the axially closed end of the cover portion 11, and a corresponding annular axial groove may be provided on the outer end surface of the axially closed end of the container body 21.

[0054] In one embodiment, Figure 5 9 and 10 , the shoulder portion 102 of the upper connecting portion 100 is provided with a flexible annular sealing lip 1021 extending obliquely inward for a certain length along its entire circumference. The first annular protrusion 201 of the lower connecting portion 200 is provided with an annular sealing groove 2011 along its entire circumference, and the sealing lip 1021 and the sealing groove 2011 have a mutually matching structure. Thus, after the upper connecting portion 100 and the lower connecting portion 200 are combined in the secondary locking state, the sealing lip 1021 engages with the sealing groove 2011, thereby achieving a sealing effect on the container 1 and effectively preventing leakage of the contents inside the container 1.

[0055] According to one embodiment of the present application, the container 1 and its connecting structure 10 can be formed integrally and made of the same material, which can be selected from: ABS, polystyrene, polycarbonate, PP, PE, etc.

[0056] The connection structure according to the embodiment of the present application and the container having the connection structure have the following technical effects:

[0057] 1. The upper connecting part can be combined with the lower connecting part by pressing and realize two-level locking, thereby ensuring that the connection structure is more stable, simple in structure and easy to operate.

[0058] 2. When separating the connection structure, two different operations are required to release the secondary lock and the primary lock respectively, thereby increasing the complexity of the operation when opening the container provided with the connection structure, which can effectively prevent the container from being opened by mistake.

[0059] 3. The container of the present application is provided with mutually cooperating annular grooves and annular fins on the closed end faces of the cover and the container body, respectively, which can maintain the stability of stacking multiple containers, thereby better meeting the flexibility requirements of stacking and storing multiple containers.

[0060] 4. Since the connection structure of the present application is also provided with mutually matching sealing lips and sealing grooves, the container provided with the connection structure can achieve a sealing effect.

[0061] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A connection structure, characterized in that: include: upper connecting portion; and Lower connecting part, The upper connecting portion and the lower connecting portion are hollow, and the cross-sectional shape of the upper connecting portion is the same as the cross-sectional shape of the lower connecting portion, and one axial end of the upper connecting portion and one axial end of the lower connecting portion can be connected in the axial direction; The inner peripheral wall surface of the upper connecting portion has a plurality of protrusions uniformly distributed along the circumference at the same axial position and protruding radially inward; A first annular protrusion and a second annular protrusion are sequentially provided on the outer peripheral wall surface of one axial end of the lower connecting portion, protruding radially outward and perpendicular to the axis, and the first annular protrusion and the second annular protrusion are parallel to each other in the axial direction and form an annular guide groove between the two in the axial direction; The upper connecting portion is connected to the lower connecting portion by the protrusion being accommodated in the guide groove or by the protrusion only being in axial contact with the second annular protrusion.

2. The connection structure according to claim 1, characterized in that: When the protrusion is accommodated in the guide groove, the first annular protrusion and the second annular protrusion respectively limit the protrusion in the axial direction from two sides; When the protrusion is received in the guide groove, the protrusion can slide circumferentially on the outer peripheral wall surface of the lower connecting portion along the guide groove.

3. The connection structure according to claim 1 or 2, characterized in that: The axial cross-section of each protrusion is a symmetrical inclined surface or an arc surface, and the axial cross-sections of the first annular protrusion and the second annular protrusion are formed so that the cross-section of the guide groove matches the axial cross-section of the protrusion.

4. The connection structure according to any one of claims 1 to 3, characterized in that: The first annular protrusion is provided with a plurality of openings at equal intervals along the circumferential direction, and the number of the openings is the same as the number of the protrusions; The circumferential length of each opening portion is greater than that of the protruding portion, so that the protruding portion can move through the corresponding opening portion in the axial direction.

5. The connection structure according to claim 4, characterized in that: An axially extending baffle is provided on one circumferential side of each opening portion. The baffle axially extends from the first annular protrusion toward the second annular protrusion and continues to axially extend for a certain length after reaching the second annular protrusion.

6. The connection structure according to claim 4 or 5, characterized in that: An axial stop portion is provided on the outer peripheral wall surface of the lower connecting portion, and the second annular protrusion is axially located between the axial stop portion and the first annular protrusion; An axial distance between the axial stop portion and the second annular protrusion is equal to an axial distance between an axial end of the upper connecting portion coupled with the lower connecting portion and the protrusion.

7. The connection structure according to claim 6, characterized in that: The axial stop portion is annular and protrudes radially outward and away from the first annular protrusion.

8. The connection structure according to any one of claims 1 to 7, characterized in that: The peripheral wall of the upper connecting part is provided with a radially inwardly curved shoulder at the other axial end of the upper connecting part, and the axial distance between the shoulder and the protrusion is equal to the axial distance from the axial end of the lower connecting part combined with the upper connecting part to the second annular protrusion.

9. The connection structure according to any one of claims 1 to 8, characterized in that: The upper connecting part and the lower connecting part are made of flexible material.

10. The connection structure according to claim 8, characterized in that: The shoulder is provided with a flexible annular sealing lip extending obliquely inward for a certain length along the entire circumference. The first annular protrusion is provided with an annular sealing groove along the entire circumference. The sealing lip and the sealing groove have a mutually matching structure. After the upper connecting portion is combined with the lower connecting portion, the sealing lip is combined with the sealing groove.

11. A container, comprising: lid part; Container body; as well as The connection structure according to any one of claims 1 to 10, It is characterized in that the cover and the container body respectively have an axial open end and an axial closed end; The upper connecting portion is arranged at the axial opening end of the cover portion, and the lower connecting portion is arranged at the axial opening end of the container body. The axial opening end of the cover portion and the axial opening end of the container body are axially combined by the connecting structure to form a closed accommodating space.

12. The container according to claim 11, wherein An annular groove or an annular fin is provided on the outer end surface of the axial closed end of the cover portion, and an annular fin or an annular groove is provided on the outer end surface of the axial closed end of the container body; The annular groove or annular fin of the cover corresponds to the position and shape of the annular fin or annular groove of the container body, so that when multiple identical containers are axially stacked, the annular groove or annular fin of the cover of one container cooperates with the annular fin or annular groove of the container body of another container.

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