Plug-in assembly and valve body connecting structure

Abstract

The utility model relates to the technical field of valve connection, and discloses a plug-in assembly and a valve body connection structure. The inserting assembly comprises a first connecting joint, a second connecting joint, a limiting pin and a first sealing piece, the first connecting joint is formed at one end of the first component, and an inserting hole is formed in the first connecting joint; the second connecting joint is formed at one end of the second component, the first connecting joint is arranged outside the second connecting joint in a sealing and sleeving manner, and a limiting groove is formed in the side wall of the second connecting joint; the limiting pin is inserted into the insertion hole and is partially limited in the limiting groove; the first sealing piece is located between the limiting pin and the inserting hole. According to the plug-in assembly, the first part and the second part can be fixed in a plug-in mode, the assembling process can be simplified, the assembling efficiency can be improved, and the sealing performance of the connecting position can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valve component connection, in particular to a plug-in component and a valve body connection structure. Background Art

[0002] Threaded connections are a common method for valve connections, but they often present the following challenges during assembly: 1) The installation process is cumbersome. To ensure a good seal, threaded connections often require wrapping with raw tape. Too thick a tape prevents the two connected pipes from docking, while too thin a tape can easily cause leakage. 2) Installation efficiency is low. To ensure a tight fit, installation tools such as wrenches are often required. This can complicate installation when space is limited, significantly impacting efficiency.

[0003] Therefore, it is urgent to propose a plug-in assembly to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a plug-in assembly and a valve body connection structure, which can simplify the assembly process, improve the assembly efficiency, and ensure the sealing at the connection position.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] A plug-in assembly for connecting a first component and a second component, the plug-in assembly comprising:

[0007] a first connecting joint formed at one end of the first component, wherein the first connecting joint is provided with a plug hole;

[0008] A second connecting joint is formed at one end of the second component, the first connecting joint sealing sleeve is arranged outside the second connecting joint, and a limiting groove is provided on the side wall of the second connecting joint;

[0009] A limiting pin, inserted into the inserting hole and partially limited in the limiting groove;

[0010] The first sealing member is located between the limiting pin and the inserting hole.

[0011] As a preferred solution of the plug-in assembly provided by the present invention, the plug-in hole is a through hole or a blind hole.

[0012] As a preferred solution of the plug-in assembly provided by the present invention, when the plug-in hole is a through hole, the number of the first sealing members is at least two, wherein some of the first sealing members are located on one side of the connecting position between the plug-in hole and the limiting groove, and the remaining first sealing members are located on the other side of the connecting position between the plug-in hole and the limiting groove.

[0013] As a preferred solution of the plug assembly provided by the present invention, when the plug hole is a blind hole, the number of the first sealing member is at least one, wherein some of the first sealing members are located on a side close to the opening of the plug hole.

[0014] As a preferred solution of the plug-in assembly provided by the present invention, the limiting groove is an annular groove.

[0015] As a preferred solution of the plug-in assembly provided by the present invention, a second sealing member is further provided between the first connecting joint and the second connecting joint.

[0016] As a preferred solution of the plug-in assembly provided by the present invention, the number of the second sealing members is at least two, and the at least two second sealing members are respectively located on both sides of the limiting groove.

[0017] As a preferred solution of the plug assembly provided by the present invention, a first step surface is protruding outwardly from the outer wall of the second connecting joint, and the end face of the first connecting joint can abut against the first step surface; or

[0018] The inner wall of the first connecting joint is provided with a second step surface protruding inwardly, and the end surface of the second connecting joint can abut against the second step surface.

[0019] As a preferred solution of the plug-in assembly provided by the present invention, the first connecting joint includes a main body and an extension portion protruding from the main body, and the plug-in hole is provided in the extension portion.

[0020] As a preferred solution of the plug-in assembly provided by the present invention, the limit pin is a single pin.

[0021] To achieve the above-mentioned purpose, the present invention also provides a valve body connection structure, including a first valve body, a second valve body and the plug-in assembly as described above, wherein the first connection joint of the plug-in assembly is formed on one of the first valve body and the second valve body, and the second connection joint is formed on the other of the first valve body and the second valve body.

[0022] The beneficial effects of the utility model are:

[0023] The plug-in assembly provided by the utility model can be used for stable connection between a first component and a second component; when connecting, the second connecting joint can be inserted into the first connecting joint first; after being plugged in place, the first sealing member can be installed on the limit pin, and then the limit pin is inserted into the plug-in hole. At this time, part of the limit pin can be limited in the limit groove of the second connecting joint, thereby realizing the plug-in fixation between the first component and the second component while also limiting the axial movement of the two; by arranging the first sealing member between the plug-in hole and the limit pin, on the one hand, the limit pin can be stably installed in the plug-in hole to prevent it from falling off during use; on the other hand, it can also play a sealing role to prevent the fluid medium between the first component and the second component from leaking through the plug-in hole after the seal between the first connecting joint and the second connecting joint fails, thereby ensuring the safety and stability of the equipment when in use; in this plug-in assembly, the operator only needs to insert the limit pin into the plug-in hole to realize the connection between the two valve bodies, thereby simplifying the assembly process and improving assembly efficiency.

[0024] The valve body connection structure provided by the present invention can achieve a stable connection between the two valve bodies by applying the above-mentioned plug-in assembly, ensuring the sealing at the connection position, while simplifying the assembly process and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the valve body connection structure provided in Example 1 of the present utility model;

[0026] Figure 2 This is a structural diagram of the first valve body provided in Example 1 of the present utility model;

[0027] Figure 3 This is a schematic cross-sectional view of the first valve body provided in the first embodiment of the present utility model;

[0028] Figure 4 This is a structural diagram of the second valve body provided in Example 1 of the present utility model;

[0029] Figure 5 This is a cross-sectional schematic diagram of the second valve body provided in the first embodiment of the present utility model;

[0030] Figure 6 This is a first cross-sectional schematic diagram (partial) of the valve body connection structure provided in Example 1 of the present utility model;

[0031] Figure 7 This is a second cross-sectional schematic diagram of the valve body connection structure provided in the first embodiment of the present utility model;

[0032] Figure 8 yes Figure 7 A local enlarged view at point A;

[0033] Figure 9 This is a schematic structural diagram of the limit pin provided in the first embodiment of the present invention;

[0034] Figure 10 This is a structural diagram of the valve body connection structure provided in the second embodiment of the present utility model;

[0035] Figure 11 This is a first cross-sectional schematic diagram (partial) of the valve body connection structure provided in the second embodiment of the present utility model;

[0036] Figure 12 This is a second cross-sectional schematic diagram of the valve body connection structure provided in the second embodiment of the present utility model;

[0037] Figure 13 yes Figure 12 A partial enlarged view at point B;

[0038] Figure 14 This is a cross-sectional schematic diagram (partial) of the valve body connection structure provided in the third embodiment of the present invention;

[0039] Figure 15 It is a cross-sectional schematic diagram of the limit pin provided in the third embodiment of the present utility model.

[0040] In the picture:

[0041] 100, first valve body; 110, first valve body; 120, first connecting joint; 121, main body; 122, extension; 1220, end surface; 1221, plug hole; 1222, first mounting groove;

[0042] 200, second valve body; 210, second valve body; 220, second connecting joint; 221, limiting groove; 222, second mounting groove; 223, first step surface;

[0043] 300, limit pin; 301, handle;

[0044] 400, first sealing member;

[0045] 500. Second sealing member. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0047] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0050] The present invention provides a plug-in assembly for connecting a first component and a second component. Specifically, the plug-in assembly can be used for connecting pipelines, wherein the first component is a first pipeline to be connected, and the second component is a second pipeline to be connected; the plug-in assembly can also be used for connecting a valve body and a pipeline, wherein the first component is a pipeline to be connected, and the second component is a valve body to be connected; the plug-in assembly can also be used for connecting valve bodies, wherein the first component is a first valve body to be connected, and the second component is a second valve body to be connected. It should be noted that the present invention does not limit the specific structure and model of the above-mentioned valve body, which can be a lock valve, a pressure reducing valve, a ball valve, etc.

[0051] For ease of understanding, the plug-in assembly provided by the present invention is described in detail below using two connected valve bodies as an example through multiple embodiments.

[0052] Example 1

[0053] Figure 1A structural schematic diagram of the valve body connection structure provided in this embodiment is shown. Figure 2 FIG. 1 shows a schematic structural diagram of the first valve body 100 provided in this embodiment. Figure 3 FIG. 1 shows a schematic cross-sectional view of the first valve body 100 provided in this embodiment. Figure 4 FIG. 2 shows a structural schematic diagram of the second valve body 200 provided in this embodiment. Figure 5 FIG. 2 shows a cross-sectional view of the second valve body 200 provided in this embodiment. Figure 1-Figure 5 As shown, this embodiment provides a valve body connection structure, which includes a first valve body 100 and a second valve body 200. Figure 3 As the dotted line in the figure, the first valve body 100 includes a first valve body 110 and a first connecting joint 120 connected to each other; Figure 5 The second valve body 200 includes a second valve body 210 and a second connecting joint 220, which are connected. When connected, the first connecting joint 120 is sleeved outside the second connecting joint 220, so that the first connecting joint 120 and the second connecting joint 220 are connected to each other and the media inside them can flow between them.

[0054] Figure 6 A first cross-sectional schematic diagram (partial) of the valve body connection structure provided by this embodiment is shown. Figure 7 A second cross-sectional schematic diagram of the valve body connection structure provided in this embodiment is shown. Figure 8 Shown Figure 7 A partial enlarged view at point A. Figure 6-Figure 8 Combined with Figure 3 、 Figure 5 As shown, the valve body connection structure further includes a stop pin 300 and a first sealing member 400. The first connecting joint 120 is provided with an insertion hole 1221, and the side wall of the second connecting joint 220 is provided with a stop slot 221. The stop pin 300 is inserted into the insertion hole 1221 and partially retained in the stop slot 221; the first sealing member 400 is located between the stop pin 300 and the insertion hole 1221. It should be noted that the first connecting joint 120, the second connecting joint 220, the stop pin 300, and the first sealing member 400 form the above-mentioned plug-in assembly.

[0055] The plug-in assembly provided in this embodiment can be used for stable connection between the first valve body 100 and the second valve body 200; when connecting, the second connecting joint 220 can be inserted into the first connecting joint 120 first; after being plugged in place, the first sealing member 400 is installed on the limiting pin 300, and then the limiting pin 300 is inserted into the plug-in hole 1221. At this time, part of the limiting pin 300 can be limited in the limiting groove 221 of the second connecting joint 220, so that the axial movement of the first valve body 100 and the second valve body 200 can be limited while achieving plug-in fixation between the first valve body 100 and the second valve body 200; by arranging the first sealing member 40 between the plug-in hole 1221 and the limiting pin 300 0, on the one hand, it can realize the stable installation of the limit pin 300 in the plug hole 1221 to prevent it from falling off during use, and on the other hand, it can also play a sealing role to prevent the fluid medium between the first valve body 100 and the second valve body 200 from leaking through the gap between the first connection joint 120 and the second connection joint 220 through the plug hole 1221 after the seal between the first connection joint 120 and the second connection joint 220 fails, thereby ensuring the safety and stability of the equipment during use; with this plug-in assembly, the operator only needs to insert the limit pin 300 into the plug hole 1221 to realize the connection between the two valve bodies, thereby simplifying the assembly process and improving assembly efficiency.

[0056] like Figure 4 As shown, the limiting groove 221 is an annular groove and is perpendicular to the central axis of the second connecting joint 220. This not only facilitates processing, but also allows the first connecting joint 120 to rotate 360 ​​degrees during the process of the second connecting joint 220 extending into the first connecting joint 120. When assembling the limiting pin 300, there is no need to adjust the relative angle between the second connecting joint 220 and the first connecting joint 120. The limiting pin 300 can be locked in the limiting groove 221 after extending from the insertion hole 1221, further facilitating the installation of the limiting pin 300.

[0057] like Figure 2 and Figure 4As shown, in order to position the insertion hole 1221 and the limiting groove 221 axially when the second connecting joint 220 is inserted into the first connecting joint 120, in this embodiment, a first stepped surface 223 is protruded outwardly from the outer wall of the second connecting joint 220, and the end surface of the first connecting joint 120 can abut against the first stepped surface 223. The provision of the first stepped surface 223 not only serves as a reminder of the insertion position, but also serves as a positioning function. That is, when the end surface of the first connecting joint 120 abuts against the first stepped surface 223, the insertion hole 1221 and the limiting groove 221 are exactly aligned. At this time, when the limiting pin 300 is inserted into the insertion hole 1221, a portion of the limiting pin 300 is precisely fixed in the limiting groove 221, thereby achieving axial positioning of the first valve body 100 and the second valve body 200. Of course, in other embodiments, a second step surface may be provided on the inner wall of the first connecting joint 120 so that the end surface of the second connecting joint 220 can abut against the second step surface. This design can also achieve the above-mentioned effect.

[0058] like Figure 2 As shown, in this embodiment, the first connecting joint 120 includes a main body 121 and an extension 122 protruding from the main body 121, and the plug hole 1221 is provided in the extension 122. Specifically, a flow channel for the fluid medium to pass through is provided in the main body 121, and the extension 122 extends tangentially to the main body 121. The provision of the extension 122 can lengthen the length of the plug hole 1221, thereby improving the reliability of the plug assembly; and can avoid the situation where the diameter of the flow channel inside the first connecting joint 120 is reduced due to directly providing the plug hole 1221 on the side wall of the main body 121, thereby ensuring the normal circulation of the fluid medium. Optionally, the end face 1220 of the extension 122 is a plane, and the plug hole 1221 is provided on this plane, which facilitates positioning and processing of the plug hole 1221.

[0059] The axis of the insertion hole 1221 is perpendicular to the axis of the first connection joint 120. When the first valve body 100 and the second valve body 200 are connected, the second connection joint 220 and the first connection joint 120 are plugged together along the axis of the first connection joint 120. The limiting pin 300 limits the second connection joint 220 and the first connection joint 120 in a direction perpendicular to the axis of the first connection joint 120, further ensuring the stability of the connection between the two.

[0060] Figure 9 FIG. 3 shows a schematic structural diagram of the limit pin 300 provided in this embodiment. Figure 9 and combined Figure 6As shown, in this embodiment, the stop pin 300 is a single pin, that is, the stop pin 300 has a straight rod-like structure that can be directly inserted into the insertion hole 1221, further enhancing the reliability of the connection and the convenience of the assembly process. Optionally, the end of the stop pin 300 also has a protruding handle 301 to facilitate the removal and installation of the stop pin 300. It should be noted that during actual installation, the stop pin 300 can be inserted into the insertion hole 1221 from either end of the opening, further improving the convenience of assembly between the first valve body 100 and the second valve body 200.

[0061] like Figure 4-Figure 8 As shown, to achieve a sealed installation between the second connecting joint 220 and the first connecting joint 120, a second sealing member 500 is further provided between the first connecting joint 120 and the second connecting joint 220. The provision of the second sealing member 500 can prevent the fluid medium in the first valve body 100 and the second valve body 200 from leaking through the gap between the first connecting joint 120 and the second connecting joint 220.

[0062] In this embodiment, the number of the second sealing members 500 is two, and the two second sealing members 500 are respectively located on both sides of the limiting groove 221. Figure 8 Taking the illustrated direction as an example, the second seal 500 on the left side prevents the fluid medium within the first valve body 100 and the second valve body 200 from leaking through the gap between them. If the second seal 500 fails, the first seal 400 in the insertion hole 1221 prevents the fluid medium within the first valve body 100 and the second valve body 200 from leaking through the insertion hole 1221. The second seal 500 on the right side prevents dust and impurities from entering the internal flow path of the first valve body 100 and the second valve body 200 through the gap between the first connection joint 120 and the second connection joint 220, thereby contaminating the fluid medium. The second seal 500 is a rubber seal ring, which has good sealing effect and low cost.

[0063] It should be noted that this embodiment does not limit the number of second seals 500. The number of second seals 500 can also be three, four, five, or even more. During installation, only some of the second seals 500 are located on one side of the limiting groove 221, and the other part of the second seals 500 are located on the other side of the limiting groove 221.

[0064] To ensure the stability of the installation of the second sealing member 500, in this embodiment, the outer wall of the second connecting joint 220 is provided with a second installation groove 222 for installing the second sealing member 500, thereby preventing the second sealing member 500 from falling off or shifting. Of course, in other embodiments, the second installation groove 222 can also be provided on the inner wall of the first connecting joint 120 to install the second sealing member 500, which can also achieve the above-mentioned effect.

[0065] Continue as Figure 6 As shown, in this embodiment, the plug hole 1221 is a through hole that passes through the extension portion 122 for easy processing. To ensure a good seal between the limiting pin 300 and the plug hole 1221, the number of the first sealing members 400 is at least two, of which part of the first sealing members 400 is located on one side of the plug hole 1221 and the limiting groove 221 at the communication position, and the remaining part of the first sealing members 400 is located on the other side of the plug hole 1221 and the limiting groove 221 at the communication position. That is to say, even when Figure 8 If the second seal 500 on the left side fails, the fluid medium in the internal flow path of the first valve body 100 and the second valve body 200 will not leak from either end of the plug hole 1221. This embodiment has two first seals 400, which reduces the number of first seals 400 while ensuring sealing performance, thereby reducing processing costs. The first seal 400 is a rubber sealing ring, which has good sealing performance and low cost.

[0066] In order to ensure the stability of the installation of the first sealing member 400, a first installation groove 1222 for installing the first sealing member 400 is provided on the hole wall of the plug hole 1221 to prevent the first sealing member 400 from falling off or shifting.

[0067] To facilitate processing, in this embodiment, the first connecting joint 120 and the first valve body 110 are an integrally formed structure, and the second connecting joint 220 and the second valve body 210 are an integrally formed structure. This setting method can omit the assembly process between multiple parts and improve assembly efficiency.

[0068] like Figure 1 As shown, to facilitate the sequential connection between multiple valve bodies and multiple pipelines in a pipeline connection, a second connecting joint 220 is further formed at the other end of the first valve body 100, and a first connecting joint 120 is further formed at the other end of the second valve body 200. In other words, the first connecting joint 120 and the second connecting joint 220 are respectively formed at both ends of the first valve body 100, and the first connecting joint 120 and the second connecting joint 220 are respectively formed at both ends of the second valve body 200. During connection, the first connecting joint 120 of the first valve body 100 is plugged into the second connecting joint 220 of the second valve body 200, and the second connecting joint 220 of the first valve body 100 can be plugged into other valve bodies or pipelines in the pipeline, and the first connecting joint 120 of the second valve body 200 can be plugged into other valve bodies or pipelines in the pipeline.

[0069] Example 2

[0070] This embodiment provides a valve body connection structure, the specific structure of which is substantially the same as that of the valve body connection structure in the first embodiment, except that the structure of the plug hole 1221 is different.

[0071] Figure 10 A structural schematic diagram of the valve body connection structure provided in this embodiment is shown. Figure 11 A first cross-sectional schematic diagram (partial) of the valve body connection structure provided by this embodiment is shown. Figure 12 A second cross-sectional schematic diagram of the valve body connection structure provided in this embodiment is shown. Figure 13 Shown Figure 12 A partial enlarged view at point B. Figure 10-13 As shown, in this embodiment, the insertion hole 1221 is a blind hole, and the number of the first sealing member 400 is one, which is located on the side close to the opening of the insertion hole 1221. By configuring the insertion hole 1221 as a blind hole, the end of the insertion hole 1221 without an opening can limit the limit pin 300, further preventing the limit pin 300 from falling off during use. In addition, the end of the insertion hole 1221 without an opening can also prevent the leakage of the medium fluid, thereby reducing the number of first sealing members 400 and reducing processing costs.

[0072] Of course, in other embodiments, the number of first sealing members 400 can be two, three, four, or even more, as long as at least one first sealing member 400 is located on a side close to the opening of the plug hole 1221 during installation.

[0073] Example 3

[0074] This embodiment provides a valve body connection structure, the specific structure of which is substantially the same as that of the valve body connection structure in the first embodiment, except that the first installation groove 1222 is located at a different position.

[0075] Figure 14 A schematic cross-sectional view (partial) of the valve body connection structure provided in this embodiment is shown. Figure 15 FIG. 3 shows a cross-sectional view of the limit pin 300 provided in this embodiment. Figure 14-15 As shown, in this embodiment, the stop pin 300 is provided with a first mounting groove 1222 for mounting the first sealing member 400. During assembly, the first sealing member 400 can be first inserted into the first mounting groove 1222 of the stop pin 300, and then the stop pin 300 with the first sealing member 400 inserted into the insertion hole 1211. This arrangement facilitates the positioning and installation of the first sealing member 400, simplifies the assembly steps, and improves assembly efficiency.

[0076] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A plug assembly for connecting a first component and a second component, characterized in that: The plug-in assembly comprises: A first connecting joint (120) is formed at one end of the first component, and a plug hole (1221) is provided on the first connecting joint (120); A second connecting joint (220) is formed at one end of the second component, the first connecting joint (120) is sealed and sleeved outside the second connecting joint (220), and a limiting groove (221) is provided on a side wall of the second connecting joint (220); A limiting pin (300) is inserted into the insertion hole (1221) and partially limited in the limiting groove (221); The first sealing member (400) is located between the limiting pin (300) and the plug hole (1221).

2. The plug assembly according to claim 1, characterized in that The plug-in hole (1221) is a through hole or a blind hole.

3. The plug assembly according to claim 2, characterized in that When the plug hole (1221) is a through hole, the number of the first sealing members (400) is at least two, wherein part of the first sealing members (400) is located on one side of the plug hole (1221) and the limiting groove (221) at the communication position, and the remaining part of the first sealing members (400) is located on the other side of the plug hole (1221) and the limiting groove (221) at the communication position; When the plug hole (1221) is a blind hole, the number of the first sealing member (400) is at least one, wherein part of the first sealing member (400) is located on a side close to the opening of the plug hole (1221).

4. The plug assembly according to claim 1, characterized in that The limiting groove (221) is an annular groove.

5. The plug assembly according to claim 1, characterized in that A second sealing member (500) is further provided between the first connecting joint (120) and the second connecting joint (220).

6. The plug assembly according to claim 5, characterized in that: The number of the second sealing members (500) is at least two, and the at least two second sealing members (500) are respectively located on both sides of the limiting groove (221).

7. The plug assembly according to claim 1, characterized in that A first step surface (223) is provided on the outer wall of the second connecting joint (220) and projects outwards, and the end surface of the first connecting joint (120) can abut against the first step surface (223); or The inner wall of the first connecting joint (120) is provided with a second step surface protruding inwardly, and the end surface of the second connecting joint (220) can abut against the second step surface.

8. The plug assembly according to claim 1, characterized in that The first connecting joint (120) comprises a main body (121) and an extension portion (122) protruding from the main body (121), and the plug hole (1221) is provided in the extension portion (122).

9. The plug assembly according to any one of claims 1 to 8, characterized in that: The limiting pin (300) is a single latch pin.

10. A valve body connection structure, characterized in that: The invention comprises a first valve body (100), a second valve body (200) and a plug-in assembly according to any one of claims 1 to 9, wherein the first connecting joint (120) of the plug-in assembly is formed on one of the first valve body (100) and the second valve body (200), and the second connecting joint (220) is formed on the other of the first valve body (100) and the second valve body (200).

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