Pipeline connecting structure

Abstract

The utility model relates to the technical field of pipeline connection, and discloses a pipeline connection structure. The pipeline connecting structure comprises a first connecting pipe, a second connecting pipe and a locking assembly, a first pipe joint is formed at one end of the first connecting pipe, a second pipe joint is formed at one end of the second connecting pipe, the second pipe joint can be sleeved with the first pipe joint, and the locking assembly comprises a locking pin which is of a stepped structure. The step-shaped structure comprises a large-diameter section and a small-diameter section which are connected with each other, the side part of the first pipe joint is provided with an insertion hole communicated with an internal channel of the first pipe joint, the side wall of the second pipe joint is provided with a limiting groove, and the locking pin is arranged in the insertion hole in a sliding manner so as to be switched between a locking position and an unlocking position; when the locking pin is located at the locking position, the large-diameter section part is limited in the limiting groove; when the locking pin is located at the unlocking position, the large-diameter section is disengaged from the limiting groove, and the small-diameter section right faces the limiting groove and is completely contained in the inserting hole. The pipeline connecting structure is simple in structure and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a pipeline connection structure. Background Art

[0002] Connected pipelines are widely used in fields such as petroleum, natural gas, chemical industry, municipal engineering, water supply and drainage systems, and refrigeration and heating systems. They are mainly used to achieve the transmission and distribution of fluids to ensure the smooth flow of fluids in the pipelines and meet various pressure and temperature requirements.

[0003] To meet the requirements for the fluid transmission distance in different environments, the problem of connecting pipelines is usually involved in actual use. In the prior art, adjacent two connected pipelines often adopt a threaded connection method for connection. However, the threaded connection usually has the following problems in the assembly process: 1) The installation process is cumbersome. First, to ensure the sealing effect, when installing, it is usually necessary to wind the raw material tape at the threaded connection. If the raw material tape is wound too thick, the two connected pipelines cannot be butted; if the raw material tape is wound too thin, leakage is likely to occur. 2) The installation efficiency is low. To ensure a tight fit, in the actual installation process, installation tools such as wrenches must be used. When the installation space is limited, the operation difficulty is often increased, which has a greater impact on the installation efficiency. 3) When the equipment vibrates, axial displacement and relative rotation are likely to occur between the two connected pipelines, resulting in loose connection. In severe cases, fluid leakage will also occur, affecting the normal use of the equipment.

[0004] Therefore, it is urgent to propose a pipeline connection structure to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a pipeline connection structure, which has a simple structure, is convenient for disassembly and assembly, and can prevent axial displacement between the connected pipelines due to equipment vibration and other situations, so as to ensure the normal use of the equipment.

[0006] With the above concept, the technical solution adopted by the utility model is as follows:

[0007] A pipeline connection structure includes a first connecting pipe and a second connecting pipe. One end of the first connecting pipe forms a first pipe joint, and one end of the second connecting pipe forms a second pipe joint. The first pipe joint can be sleeved outside the second pipe joint. The pipeline connection structure further includes:

[0008] A locking assembly includes a locking pin. The locking pin is a stepped structure, and the stepped structure includes a large-diameter section and a small-diameter section connected to each other. A plug hole communicating with its internal channel is arranged on the side of the first pipe joint, and a limiting groove is arranged on the side wall of the second pipe joint. The locking pin is slidably arranged in the plug hole to switch between a locking position and an unlocking position;

[0009] When the locking pin is located at the locking position, the large diameter section is partially confined in the limiting groove; when the locking pin is located at the unlocking position, the large diameter section is released from the limiting groove, and the small diameter section is opposite to the limiting groove and is completely accommodated in the plug-in hole.

[0010] As a preferred solution of the pipeline connection structure provided by the present invention, the locking assembly further includes:

[0011] a pressing member connected to an end of the small diameter section away from the large diameter section, wherein pressing the pressing member can switch the locking pin from the locked position to the unlocked position;

[0012] The elastic member can drive the locking pin to switch from the unlocking position to the locking position and maintain it in the locking position.

[0013] As a preferred solution of the pipeline connection structure provided by the utility model, a first limiting portion is protruding inwardly on the inner wall of the plug-in hole, one side of the first limiting portion can abut against the step surface between the large diameter section and the small diameter section, and the two ends of the elastic member respectively abut against the other side of the first limiting portion and the pressing member.

[0014] As a preferred solution of the pipe connection structure provided by the present invention, a first limiting portion is protruded inwardly on the inner wall of the plug hole, and the first limiting portion can abut against the step surface between the large diameter section and the small diameter section;

[0015] A second limiting portion is further provided at one end of the plug-in hole away from the pressing member, and two ends of the elastic member are respectively in contact with the second limiting portion and the large-diameter section.

[0016] As a preferred solution of the pipeline connection structure provided by the present invention, the second limiting portion is detachably connected to the plug hole.

[0017] As a preferred solution of the pipeline connection structure provided by the present invention, an extension portion is protruded from the side wall of the first pipe joint, and the plug hole is opened on the extension portion.

[0018] As a preferred solution of the pipeline connection structure provided by the present invention, at least one sealing member is provided between the first pipe joint and the second pipe joint.

[0019] As a preferred solution of the pipeline connection structure provided by the utility model, there are two seals, which are sleeved on the second pipe joint at intervals along the axial direction of the second pipe joint, and the two seals are respectively located on both sides of the locking pin.

[0020] As a preferred solution of the pipeline connection structure provided by the present utility model, at least one of the first pipe joint and the second pipe joint is provided with a receiving groove for receiving the sealing member.

[0021] As a preferred solution of the pipeline connection structure provided by the present utility model, the number of the sealing members is two, and the two sealing members are respectively located on both sides of the limiting groove.

[0022] As a preferred solution of the pipeline connection structure provided by the present utility model, the cross-sectional shape of the large-diameter section is circular or polygonal, and the cross-sectional shape of the insertion hole is adapted to the cross-sectional shape of the large-diameter section.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The present utility model provides a pipeline connection structure. When the first connecting pipe and the second connecting pipe are connected, the locking pin can be first switched to the unlocking position, and then the second pipe joint can be inserted into the first pipe joint; after the insertion is in place, the locking pin is switched from the unlocking position to the locking position. At this time, the locking pin is partially limited in the limiting groove, so that while realizing the plug-in fixation between the first connecting pipe and the second connecting pipe, the axial movement of the two can also be limited to avoid the axial displacement of the first connecting pipe and the second connecting pipe due to equipment vibration and other reasons, thereby ensuring the normal use of the equipment; in addition, during the connection or disassembly of the first connecting pipe and the second connecting pipe, the locking pin does not need to be removed from the first pipe joint, which can ensure the disassembly and assembly efficiency between the first connecting pipe and the second connecting pipe, and can avoid the separation of the locking pin from the first pipe joint due to the removal of the locking pin from the first pipe joint, thereby causing the loss of the locking pin. Description of the Drawings

[0025] Figure 1 is the first structural schematic diagram of the pipeline connection structure provided by Embodiment 1 of the present utility model;

[0026] Figure 2 is the structural schematic diagram of the first connecting pipe provided by Embodiment 1 of the present utility model;

[0027] Figure 3 is the cross-sectional schematic diagram of the first connecting pipe provided by Embodiment 1 of the present utility model;

[0028] Figure 4 is the structural schematic diagram of the second connecting pipe provided by Embodiment 1 of the present utility model;

[0029] Figure 5 is the cross-sectional schematic diagram of the second connecting pipe provided by Embodiment 1 of the present utility model;

[0030] Figure 6It is the second structural schematic diagram of the pipeline connection structure provided by the first embodiment of the present utility model;

[0031] Figure 7 It is Figure 6 the sectional view at A-A;

[0032] Figure 8 It is Figure 6 the sectional view at B-B;

[0033] Figure 9 It is the structural schematic diagram of the locking pin provided by the first embodiment of the present utility model;

[0034] Figure 10 It is the exploded schematic diagram of the pipeline connection structure provided by the first embodiment of the present utility model;

[0035] Figure 11 It is the sectional view of the pipeline connection structure provided by the second embodiment of the present utility model.

[0036] In the figure:

[0037] 100, the first connecting pipe; 110, the first pipe body; 120, the first pipe joint; 130, the extension part; 131, the insertion hole; 1311, the first limiting part;

[0038] 200, the second connecting pipe; 210, the second pipe body; 220, the second pipe joint; 221, the limiting groove; 222, the accommodating groove;

[0039] 300, the locking assembly; 310, the locking pin; 311, the large-diameter section; 312, the small-diameter section; 320, the pressing part; 330, the elastic part; 340, the second limiting part;

[0040] 400, the sealing part. Specific embodiments

[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0045] Embodiment 1

[0046] Figure 1 Fig. 1 shows a first schematic structural view of the pipeline connection structure provided in this embodiment. Figure 2 Fig. 2 shows a schematic structural view of the first connecting pipe 100 provided in this embodiment. Figure 3 Fig. 3 shows a sectional schematic view of the first connecting pipe 100 provided in this embodiment. Figure 4 Fig. 4 shows a schematic structural view of the second connecting pipe 200 provided in this embodiment. Figure 5 Fig. 5 shows a sectional schematic view of the second connecting pipe 200 provided in this embodiment. As Figures 1 - 5 shown, this embodiment provides a pipeline connection structure, which includes a first connecting pipe 100 and a second connecting pipe 200. Taking the Figure 3 dotted line in... as the boundary, the first connecting pipe 100 includes a connected first pipe body 110 and a first pipe joint 120; taking the Figure 5Bounded by the dashed line therein, the second connecting pipe 200 includes a connected second pipe body 210 and a second pipe joint 220. During connection, the first pipe joint 120 is sleeved outside the second pipe joint 220 so that the first connecting pipe 100 and the second connecting pipe 200 are butted against each other, and the media inside the two are ensured to flow through each other.

[0047] Figure 6 Fig. 4 shows a second schematic structural diagram of the pipeline connection structure provided in this embodiment. Figure 7 shows Figure 6 a cross-sectional view taken at A-A. Figure 8 shows Figure 6 a cross-sectional view taken at B-B. Figure 9 Fig. 5 shows a schematic structural diagram of the locking pin 310 provided in this embodiment. As Figures 6 - 9 and in combination with Figure 1 shown, the pipeline connection structure further includes a locking assembly 300. The locking assembly 300 includes a locking pin 310. The locking pin 310 has a stepped structure. The stepped structure includes a connected large-diameter section 311 and a small-diameter section 312. A plug hole 131 communicating with its internal channel is provided on the side of the first pipe joint 120. A limiting groove 221 is provided on the side wall of the second pipe joint 220. The locking pin 310 is slidably arranged in the plug hole 131 to switch between a locking position and an unlocking position. When the locking pin 310 is in the locking position, a part of the large-diameter section 311 of the locking pin 310 is limited in the limiting groove 221. When the locking pin 310 is in the unlocking position, the large-diameter section 311 disengages from the limiting groove 221, and the small-diameter section 312 is aligned with the limiting groove 221 and completely accommodated in the plug hole 131. It should be explained that the internal channel of the first pipe joint 120 refers to the flow channel for the medium to flow through.

[0048] For the pipeline connection structure provided in this embodiment, when the first connecting pipe 100 and the second connecting pipe 200 are connected, the locking pin 310 can be first switched to the unlocking position, and then the second pipe joint 220 can be inserted into the first pipe joint 120. After being inserted in place, the locking pin 310 is switched from the unlocking position to the locking position. At this time, a part of the locking pin 310 is limited in the limiting groove 221, so that while realizing the plug-in fixation between the first connecting pipe 100 and the second connecting pipe 200, the axial movement of the two can also be limited to avoid axial displacement of the first connecting pipe 100 and the second connecting pipe 200 due to equipment vibration or other reasons, thereby ensuring the normal use of the equipment. In addition, during the connection or disassembly of the first connecting pipe 100 and the second connecting pipe 200, the locking pin 310 does not need to be removed from the first pipe joint 120, which can ensure the disassembly and assembly efficiency between the first connecting pipe 100 and the second connecting pipe 200, and can avoid the separation of the locking pin 310 from the first pipe joint 120 due to removing the locking pin 310 from the first pipe joint 120, thereby causing the loss of the locking pin 310.

[0049] As Figure 1 and Figure 4 shown, in this embodiment, an extension portion 130 is convexly provided on the side wall of the first pipe joint 120, and the insertion hole 131 is formed on the extension portion 130. By additionally providing the extension portion 130 on the first pipe joint 120 and arranging the insertion hole 131 on the extension portion 130, it is possible to avoid the situation where the diameter of the internal passage of the first pipe joint 120 is reduced due to directly arranging the insertion hole 131 on the side wall of the first pipe joint 120, thereby ensuring the normal flow of the medium.

[0050] Optionally, the axis of the insertion hole 131 is perpendicular to the axis direction of the first pipe joint 120. When the first connecting pipe 100 and the second connecting pipe 200 are connected, the second pipe joint 220 and the first pipe joint 120 are inserted along the axis direction of the first pipe joint 120, and the locking pin 310 locks the second pipe joint 220 and the first pipe joint 120 in a direction perpendicular to the axis direction of the first pipe joint 120, which can further ensure the stability of the connection between the two.

[0051] Figure 10 shows an exploded schematic view of the pipeline connection structure provided in this embodiment. As Figure 10 and combined with Figures 7 - 9 shown, the locking assembly 300 further includes a pressing member 320 and an elastic member 330. The pressing member 320 is connected to one end of the small-diameter section 312 away from the large-diameter section 311. Pressing the pressing member 320 can switch the locking pin 310 from the locked position to the unlocked position; the elastic member 330 can drive the locking pin 310 to switch from the unlocked position to the locked position and maintain it in the locked position. Through the cooperation of the pressing member 320 and the elastic member 330, the switching of the locking pin 310 between the locked position and the unlocked position is realized. When it is necessary to connect the first connecting pipe 100 and the second connecting pipe 200, the operator can press the pressing member 320 to drive the locking pin 310 to switch from the locked position to the unlocked position, so as to facilitate the insertion of the second pipe joint 220 into the first pipe joint 120; when the insertion is in place, the operator releases the pressing member 320, and the locking pin 310 can switch from the unlocked position to the locked position under the action of the elastic restoring force of the elastic member 330 and maintain the locking pin 310 in the locked position under its own elastic force, so that the locking pin 310 is always limited in the limiting groove 221 of the second pipe joint 220. The structure is simple and the disassembly and assembly are convenient, and only a simple pressing action of the operator is required to realize the insertion and locking of the two.

[0052] Optionally, a first limiting portion 1311 protrudes inward from the inner wall of the insertion hole 131. One side of the first limiting portion 1311 can abut against the step surface between the large-diameter section 311 and the small-diameter section 312. Two ends of the elastic member 330 respectively abut against the other side of the first limiting portion 1311 and the pressing member 320. By providing the first limiting portion 1311, the maximum moving distance of the locking pin 310 can be limited to prevent the locking pin 310 from disengaging from the end of the insertion hole 131 close to the pressing member 320 under the elastic force of the elastic member 330. And when the step surface on the locking pin 310 abuts against the first limiting portion 1311, the distance that the large-diameter section 311 of the locking pin 310 extends into the limiting groove 221 is the largest, and the locking effect is better. In this embodiment, the elastic member 330 is a spring, which has a large elastic restoring force, is convenient for assembly, and has a low cost.

[0053] To facilitate the assembly between the locking assembly 300 and the first pipe joint 120, the pressing member 320 is detachably connected to the small-diameter section 312 of the locking pin 310. As Figure 7 and Figure 10 shown, the assembly process of the locking assembly 300 and the first pipe joint 120 is as follows: 1) First, make the small-diameter section 312 of the locking pin 310 face upward, and insert the locking pin 310 from the bottom of the insertion hole 131; 2) Sleeve the elastic member 330 on the small-diameter section 312 from the top of the insertion hole 131; 3) Connect the pressing member 320 to the top of the small-diameter section 312. The pressing member 320 simultaneously presses the elastic member 330 to install the elastic member 330 in a compressed state in the insertion hole 131. At this time, the bottom of the elastic member 330 abuts against the first limiting portion 1311, the top of the elastic member 330 abuts against the pressing member 320, and the locking pin 310, under the elastic force of the elastic member 330, has its step surface tightly abutting against the first limiting portion 1311, that is, without external force, the locking pin 310 can be maintained in the locking position. It should be noted that the "up", "top", and "bottom" mentioned in this embodiment are not the "up" and "down" in the spatial sense when the pipeline connection structure is actually installed, but are only used to refer to Figure 7 the view orientation to distinguish different features and cannot be used as a limitation to the technical solution of this application.

[0054] Optionally, the pressing member 320 is threadedly connected to the small-diameter section 312, which is convenient for disassembly and assembly and has a firm connection. Specifically, an external thread is provided on the small-diameter section 312, and an internal thread is provided on the pressing member 320. The pressing member 320 is screwed onto the outside of the small-diameter section 312. In this embodiment, the pressing member 320 can directly use a nut, which has a simple structure, convenient material selection, and can reduce the manufacturing cost.

[0055] As Figures 7 - 9As shown, in this embodiment, the cross-sectional shape of the large-diameter section 311 is quadrilateral, and the cross-sectional shape of the insertion hole 131 is adapted to that of the large-diameter section 311. This design enables the side surface (plane) of the large-diameter section 311 to contact the groove wall and the bottom of the limiting groove 221 when the first connecting pipe 100 and the second connecting pipe 200 are connected, increasing the contact area and improving the limiting effect. In addition, this design can also prevent the locking pin 310 from rotating in the insertion hole 131 and applying torque to the elastic member 330, thereby extending the service life of the elastic member 330. Of course, in other embodiments, the cross-sectional shape of the large-diameter section 311 can also be set as circular or other polygons, and this embodiment does not limit this.

[0056] To ensure the sealing performance when the first connecting pipe 100 and the second connecting pipe 200 are connected, as Figure 8 and Figure 10 shown, in this embodiment, at least one sealing member 400 is sleeved on the second pipe joint 220. Optionally, the number of the sealing members 400 is two, and the two sealing members 400 are arranged at intervals along the axial direction of the second pipe joint 220 and are respectively located on both sides of the locking pin 310. Among them, the sealing member 400 located at the end of the second pipe joint 220 close to the second pipe body 210 can, while achieving the sealing effect, also play a role in dust prevention, so as to prevent dust from entering the insertion hole 131 through the gap between the first pipe joint 120 and the second pipe joint 220, resulting in the failure of the elastic member 330. Of course, this embodiment does not limit the number of the sealing members 400, and it can also be set as three, four, five or even more.

[0057] Optionally, a receiving groove 222 for receiving the sealing member 400 is further provided on the outer wall of the second pipe joint 220 to achieve the stable assembly of the sealing member 400 and prevent it from falling off. In this embodiment, each sealing member 400 corresponds to a receiving groove 222 to prevent the sealing member 400 from axially moving in the receiving groove 222 along the second pipe joint 220 when the width of the receiving groove 222 is relatively large.

[0058] In other embodiments, the receiving groove 222 can also be provided on the inner wall of the first pipe joint 120, and the sealing member 400 is installed in the corresponding receiving groove 222, which can also achieve the above effects.

[0059] For the convenience of processing, in this embodiment, the first pipe joint 120 and the first pipe body 110 are of an integrally formed structure, and the second pipe joint 220 and the second pipe body 210 are of an integrally formed structure. This setting method can omit the assembly links between multiple parts and improve the assembly efficiency.

[0060] Embodiment Two

[0061] This embodiment provides a pipeline connection structure. The specific structure of this pipeline connection structure is substantially the same as that of the pipeline connection structure in Embodiment 1, except that: the installation position of the elastic member 330 is different.

[0062] Figure 11 The cross-sectional view of the pipeline connection structure provided by this embodiment is shown. As Figure 11 shown, a first limiting portion 1311 protrudes inward from the inner wall of the insertion hole 131, and the first limiting portion 1311 can abut against the step surface between the large-diameter section 311 and the small-diameter section 312; a second limiting portion 340 is further provided at one end of the insertion hole 131 away from the pressing member 320, and both ends of the elastic member 330 are respectively abutted against the second limiting portion 340 and the large-diameter section 311. With this setting method, both ends of the elastic member 330 are respectively abutted against the second limiting portion 340 and the large-diameter section 311, so that the step surface of the locking pin 310 is tightly pressed against the first limiting portion 1311, that is, without external force, the locking pin 310 can be maintained in the locked position.

[0063] To facilitate the disassembly and assembly between the locking assembly 300 and the first pipe joint 120, the pressing member 320 is detachably connected to the small-diameter section 312 of the locking pin 310, and the second limiting portion 340 is detachably connected to the insertion hole 131. In this embodiment, the assembly process of the locking assembly 300 and the first pipe joint 120 is as follows: 1) First, make the small-diameter section 312 of the locking pin 310 face upward, and insert the locking pin 310 from the bottom of the insertion hole 131; 2) Install the elastic member 330 into the insertion hole 131 from the bottom of the insertion hole 131; 3) Connect the second limiting portion 340 to the bottom of the insertion hole 131 and compress the elastic member 330; 3) Connect the pressing member 320 to the top of the small-diameter section 312. It should be noted that the "up", "top", and "bottom" mentioned in this embodiment are not the "up" and "down" in the spatial sense when the pipeline connection structure is actually installed, but are only used to refer to Figure 11 the view orientation to distinguish different features, and cannot be used as a limitation to the technical solution of this application.

[0064] Optionally, the second limiting portion 340 can directly select a bolt, and an internal thread section is provided at the bottom of the insertion hole 131. The second limiting portion 340 is screwed into the internal thread section of the insertion hole 131, with a simple structure, convenient for disassembly and assembly, and firm connection.

[0065] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline connection structure, comprising a first connecting pipe (100) and a second connecting pipe (200). One end of the first connecting pipe (100) forms a first pipe joint (120), and one end of the second connecting pipe (200) forms a second pipe joint (220). The first pipe joint (120) can be sleeved outside the second pipe joint (220), and it is characterized in that, The pipeline connection structure further includes: A locking assembly (300), including a locking pin (310). The locking pin (310) has a stepped structure, which includes a large-diameter section (311) and a small-diameter section (312) connected to each other. A plugging hole (131) communicating with its internal passage is provided on the side of the first pipe joint (120). A limiting groove (221) is provided on the side wall of the second pipe joint (220). The locking pin (310) is slidably arranged in the plugging hole (131) to switch between a locking position and an unlocking position; When the locking pin (310) is in the locking position, a part of the large-diameter section (311) is limited in the limiting groove (221); when the locking pin (310) is in the unlocking position, the large-diameter section (311) disengages from the limiting groove (221), and the small-diameter section (312) is aligned with the limiting groove (221) and completely accommodated in the plugging hole (131).

2. The pipeline connection structure according to claim 1, characterized in that The locking assembly (300) further includes: A pressing member (320), connected to one end of the small-diameter section (312) away from the large-diameter section (311). Pressing the pressing member (320) can switch the locking pin (310) from the locking position to the unlocking position; An elastic member (330), which can drive the locking pin (310) to switch from the unlocking position to the locking position and maintain it in the locking position.

3. The pipeline connection structure according to claim 2, characterized in that, A first limiting portion (1311) protrudes inward from the inner wall of the plugging hole (131). One side of the first limiting portion (1311) can abut against the step surface between the large-diameter section (311) and the small-diameter section (312). Two ends of the elastic member (330) respectively abut against the other side of the first limiting portion (1311) and the pressing member (320).

4. The pipeline connection structure according to claim 2, wherein A first limiting portion (1311) protrudes inward from the inner wall of the plugging hole (131). The first limiting portion (1311) can abut against the step surface between the large-diameter section (311) and the small-diameter section (312); A second limiting portion (340) is further provided at one end of the plugging hole (131) facing away from the pressing member (320). Two ends of the elastic member (330) respectively abut against the second limiting portion (340) and the large-diameter section (311).

5. The pipeline connection structure according to claim 4, wherein The second limiting portion (340) is detachably connected to the plugging hole (131).

6. The pipeline connection structure according to claim 1, characterized in that, An extension portion (130) protrudes from the side wall of the first pipe joint (120). The plugging hole (131) is opened on the extension portion (130).

7. The pipeline connection structure according to claim 1, wherein, At least one sealing member (400) is provided between the first pipe joint (120) and the second pipe joint (220).

8. The pipeline connection structure according to claim 7, wherein, An accommodating groove (222) for accommodating the sealing member (400) is provided on at least one of the first pipe joint (120) and the second pipe joint (220).

9. The pipeline connection structure according to claim 7, wherein, The number of the sealing members (400) is two. The two sealing members (400) are respectively located on both sides of the limiting groove (221).

10. The pipeline connection structure according to any one of claims 1 to 9, characterized in that, The cross-sectional shape of the large-diameter section (311) is circular or polygonal, and the cross-sectional shape of the insertion hole (131) is adapted to the cross-sectional shape of the large-diameter section (311).

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