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, a limiting assembly and an anti-rotation 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, and the second pipe joint can be sleeved with the first pipe joint; a first limiting hole communicated with an internal channel of the first pipe joint is formed in the side part of the first pipe joint, a limiting groove is formed in the side wall of the second pipe joint, and the limiting pin is inserted into the first limiting hole and is partially limited in the limiting groove; the anti-rotation assembly comprises an anti-rotation pin, the side portion of the first pipe connector is provided with a second limiting hole communicated with an inner channel of the first pipe connector, the side wall of the second pipe connector is provided with a first anti-rotation plane, and the anti-rotation pin is inserted into the second limiting hole and can abut against the first anti-rotation plane. The pipeline connecting structure can prevent axial displacement and relative rotation between corresponding connecting pipelines.

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] Connecting pipes 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 realize the transmission and distribution of fluids to ensure smooth flow of fluids in the pipelines while meeting various pressure and temperature requirements.

[0003] In order to meet the requirements of fluid transmission distance in different environments, the actual use usually involves the connection problem between pipelines. In the prior art, two adjacent connecting pipelines are often connected by threaded connection. However, threaded connection usually has the following problems during the assembly process: 1) The installation process is cumbersome. First of all, in order to ensure the sealing effect, it is usually necessary to wrap raw tape around the threaded connection during installation. If the raw tape is wrapped too thickly, the two connecting pipelines cannot be docked. If the raw tape is wrapped too thinly, leakage is likely to occur; 2) The installation efficiency is low. In order to ensure a close fit, during the actual installation process, installation tools such as wrenches must be used. When the installation space is limited, the operation difficulty is often increased and the installation efficiency is greatly affected; 3) When the equipment vibrates, axial displacement and relative rotation are likely to occur between the two connecting pipelines, resulting in loose connections. In severe cases, fluid leakage may occur, affecting the normal use of the equipment.

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

[0005] The purpose of the utility model is to provide a pipeline connection structure with a simple structure, easy to disassemble and assemble, and capable of preventing axial displacement and relative rotation between corresponding connecting pipelines, thereby ensuring normal use of equipment.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] A pipe connection structure includes a first connecting pipe and a second connecting pipe, wherein 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, and the first pipe joint can be sleeved outside the second pipe joint. The pipe connection structure further includes:

[0008] A limiting assembly, comprising a limiting pin, a first limiting hole communicating with an internal passage of the first pipe joint being provided on a side portion thereof, a limiting groove being provided on a side wall of the second pipe joint, the limiting pin being inserted into the first limiting hole and partially limited in the limiting groove;

[0009] The anti-rotation component includes an anti-rotation pin, a second limiting hole connected to its internal channel is provided on the side of the first pipe joint, a first anti-rotation plane is provided on the side wall of the second pipe joint, and the anti-rotation pin is inserted into the second limiting hole and can be abutted against the first anti-rotation plane.

[0010] As a preferred solution of the pipeline connection structure provided by the present invention, a first extension portion is protruded on the side wall of the first pipe joint, and the first limiting hole is opened on the first extension portion; and / or

[0011] A second extension portion is protruded from the side wall of the first pipe joint, and the second limiting hole is formed on the second extension portion.

[0012] As a preferred solution of the pipeline connection structure provided by the present invention, the first extension portion and the second extension portion are located on the same side of the axis direction of the first pipe joint; or

[0013] The first extension portion and the second extension portion are respectively located on two sides of the first pipe joint in an axial direction.

[0014] As a preferred solution of the pipeline connection structure provided by the present invention, the limiting pin includes a first plug-in portion and a first limiting portion connected to each other, the first plug-in portion is inserted into the first limiting hole, and the first limiting portion can abut against one side of the first extension portion; and / or

[0015] The anti-rotation pin includes a second plug-in portion and a second limiting portion that are connected to each other. The second plug-in portion is inserted into the second limiting hole, and the second limiting portion can abut against one side of the second extending portion.

[0016] As a preferred solution of the pipeline connection structure provided by the present invention, the limiting assembly further includes a first locking member, the first locking member is connected to an end of the first plug-in portion away from the first limiting portion, and the first locking member can abut against the other side of the first extension portion; and / or

[0017] The anti-rotation assembly further includes a second locking member connected to an end of the second plug-in portion away from the second limiting portion, and the second locking member can be held against the other side of the second extending portion.

[0018] As a preferred solution of the pipeline connection structure provided by the present invention, at least one limiting seal is provided between the limiting pin and the first limiting hole; and / or

[0019] At least one anti-rotation seal is provided between the anti-rotation pin and the second limiting hole.

[0020] As a preferred solution of the pipeline connection structure provided by the present invention, a first installation groove for installing the limiting seal is provided on the hole wall of the first limiting hole; and / or

[0021] A second mounting groove for mounting the anti-rotation seal is provided on the hole wall of the second limiting hole.

[0022] As a preferred solution of the pipeline connection structure provided by the present invention, a second anti-rotation plane is provided on the side wall of the anti-rotation pin.

[0023] As a preferred solution of the pipeline connection structure provided by the present invention, at least one connection seal is provided between the first pipe joint and the second pipe joint.

[0024] As a preferred solution of the pipeline connection structure provided by the present invention, the number of the connection seals is two, and the two connection seals are respectively located on both sides of the limit pin.

[0025] The beneficial effects of the utility model are:

[0026] The utility model provides a pipeline connection structure. When the first connecting pipe and the second connecting pipe are connected, the second pipe joint can be inserted into the first pipe joint first; after the plug-in is in place, the limit pin and the anti-rotation pin are respectively inserted into the first limit hole and the second limit hole, wherein the limit pin can be partially limited in the limit groove of the second connecting pipe, and the second limit hole can be abutted against the first anti-rotation plane of the second connecting pipe, 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, and due to the cooperation between the second limit hole and the first anti-rotation plane, relative rotation between the first connecting pipe and the second connecting pipe can be avoided to ensure the normal use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a first structural diagram of the pipeline connection structure provided by an embodiment of the present utility model;

[0028] Figure 2 This is a structural diagram of the first connecting pipe provided by an embodiment of the present utility model;

[0029] Figure 3 This is a schematic cross-sectional view of a first connecting pipe provided by an embodiment of the present utility model;

[0030] Figure 4 This is a schematic structural diagram of the second connecting pipe provided by an embodiment of the present utility model;

[0031] Figure 5 It is a cross-sectional schematic diagram of the second connecting pipe provided by an embodiment of the present utility model;

[0032] Figure 6 This is a second structural diagram of the pipeline connection structure provided by an embodiment of the present utility model;

[0033] Figure 7 yes Figure 6 Cross-sectional view at AA;

[0034] Figure 8 This is an exploded schematic diagram of the pipeline connection structure provided by an embodiment of the present utility model;

[0035] Figure 9 yes Figure 1 A schematic cross-sectional view at the first limiting hole;

[0036] Figure 10 This is a schematic cross-sectional view of the first connecting pipe at the first limiting hole provided by an embodiment of the present utility model;

[0037] Figure 11 yes Figure 1 A schematic cross-sectional view at the second limiting hole;

[0038] Figure 12 It is a schematic cross-sectional view of the first connecting pipe at the second limiting hole provided by an embodiment of the present utility model.

[0039] In the picture:

[0040] 100, first connecting pipe; 110, first pipe body; 120, first pipe joint; 130, first extension; 131, first limiting hole; 1311, first mounting groove; 140, second extension; 141, second limiting hole; 1411, second mounting groove;

[0041] 200, second connecting pipe; 210, second pipe body; 220, second pipe joint; 221, limiting groove; 222, accommodating groove; 223, first anti-rotation plane;

[0042] 300, limit assembly; 310, limit pin; 311, first plug-in portion; 312, first limit portion; 320, first locking member; 330, limit sealing member;

[0043] 400, anti-rotation assembly; 410, anti-rotation pin; 411, second plug-in portion; 412, second limiting portion; 420, second locking member; 430, anti-rotation seal;

[0044] 500. Connecting seal. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Figure 1 A first structural schematic diagram of the pipeline connection structure provided in this embodiment is shown. Figure 2 FIG. 1 shows a schematic structural diagram of the first connecting pipe 100 provided in this embodiment. Figure 3 FIG. 1 shows a schematic cross-sectional view of the first connecting pipe 100 provided in this embodiment. Figure 4 FIG. 2 shows a schematic structural diagram of the second connecting pipe 200 provided in this embodiment. Figure 5 FIG. 2 shows a cross-sectional view of the second connecting pipe 200 provided in this embodiment. Figure 1-Figure 5As shown, this embodiment provides a pipeline connection structure, which includes a first connecting pipe 100 and a second connecting pipe 200. Figure 3 As the dotted line in the figure, the first connecting pipe 100 includes a first pipe body 110 and a first pipe joint 120 connected to each other; Figure 5 The second connecting pipe 200 includes a second pipe body 210 and a second pipe joint 220. When connected, the first pipe joint 120 is sleeved outside the second pipe joint 220 to connect the first connecting pipe 100 and the second connecting pipe 200, and ensure that the media inside the two pipes can flow between them.

[0050] Figure 6 A second structural schematic diagram of the pipeline connection structure provided in this embodiment is shown. Figure 7 Shown Figure 6 Cross-sectional view at AA. Figure 8 FIG. 1 shows an exploded schematic diagram of the pipeline connection structure provided in this embodiment. Figure 6-Figure 8 Combined with Figure 4 As shown, the pipeline connection structure also includes a limit assembly 300 and an anti-rotation assembly 400. The limit assembly 300 includes a limit pin 310. The first pipe joint 120 is provided with a first limit hole 131 connected to its internal passage on the side portion thereof, and a limit groove 221 is provided on the side wall of the second pipe joint 220. The limit pin 310 is inserted into the first limit hole 131 and partially retained in the limit groove 221. The anti-rotation assembly 400 includes an anti-rotation pin 410. The first pipe joint 120 is provided with a second limit hole 141 connected to its internal passage on the side portion thereof, and a first anti-rotation flat surface 223 is provided on the side wall of the second pipe joint 220. The anti-rotation pin 410 is inserted into the second limit hole 141 and can abut against the first anti-rotation flat surface 223. It should be explained that the internal passage of the first pipe joint 120 refers to the flow channel for the circulation of the medium.

[0051] In the pipeline connection structure provided in this embodiment, when the first connecting pipe 100 and the second connecting pipe 200 are connected, the second pipe joint 220 can be inserted into the first pipe joint 120 first; after being plugged in, the limiting pin 310 and the anti-rotation pin 410 are respectively inserted into the first limiting hole 131 and the second limiting hole 141, wherein the limiting pin 310 can be partially limited in the limiting groove 221 of the second connecting pipe 200, and the second limiting hole 141 can abut against the first anti-rotation plane 223 of the second connecting pipe 200, thereby realizing the plug-in fixation between the first connecting pipe 100 and the second connecting pipe 200 while limiting the axial movement of the two, and due to the cooperation between the second limiting hole 141 and the first anti-rotation plane 223, relative rotation between the first connecting pipe 100 and the second connecting pipe 200 can be avoided to ensure normal use of the equipment.

[0052] like Figure 2and Figure 8 As shown, in this embodiment, a first extension portion 130 is protruding from the side wall of the first pipe joint 120, and a first limiting hole 131 is defined in the first extension portion 130; a second extension portion 140 is protruding from the side wall of the first pipe joint 120, and a second limiting hole 141 is defined in the second extension portion 140. By additionally providing the first extension portion 130 and the second extension portion 140 on the first pipe joint 120, and providing the first limiting hole 131 and the second limiting hole 141 on the first extension portion 130 and the second extension portion 140, respectively, the reduction in the diameter of the internal passage of the first pipe joint 120 that would result from directly providing the first limiting hole 131 and the second limiting hole 141 on the side wall of the first pipe joint 120 is avoided, thereby ensuring normal flow of the medium.

[0053] Optionally, the axis of the first limiting hole 131 is perpendicular to the axis 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 plugged together along the axis of the first pipe joint 120. The limiting pin 310 limits the second pipe joint 220 and the first pipe joint 120 in a direction perpendicular to the axis of the first pipe joint 120, thereby further ensuring the stability of the connection between the two.

[0054] Optionally, the axis of the second limiting hole 141 is perpendicular to the axis of the first pipe joint 120. This design facilitates the processing of the second extension portion 140 and improves the aesthetic appearance of the first connecting pipe 100. In other embodiments, the axis of the second limiting hole 141 can also be arranged at an angle to the axis of the first pipe joint 120, which can also achieve the above-mentioned effect.

[0055] In this embodiment, the first extension portion 130 and the second extension portion 140 are located on the same side of the first pipe joint 120 in the axial direction. This arrangement facilitates manufacturing, minimizes the radial dimensions of the entire first connecting pipe 100, and improves the aesthetic appearance of the first connecting pipe 100. Of course, in other embodiments, the first extension portion 130 and the second extension portion 140 can be located on opposite sides of the first pipe joint 120 in the axial direction, thereby achieving the same aforementioned effects.

[0056] Figure 9 Shown Figure 1 Schematic cross-sectional view at the first limiting hole 131. Figure 10 FIG. 1 shows a cross-sectional view of the first connecting pipe 100 provided in this embodiment at the first limiting hole 131. Figure 9-10 Combined with Figure 8As shown, the limiting pin 310 includes a first plug-in portion 311 and a first limiting portion 312 that are connected. The first plug-in portion 311 is inserted into the first limiting hole 131, and the first limiting portion 312 can abut against one side of the first extension portion 130. By providing the connected first plug-in portion 311 and the first limiting portion 312, the first limiting portion 312 can limit the insertion depth of the first plug-in portion 311 in the first limiting hole 131, ensuring that the first plug-in portion 311 is partially retained within the limiting groove 221 of the second pipe joint 220 while the first limiting portion 312 is exposed outside the first limiting hole 131, thereby facilitating the operator's disassembly and assembly of the entire limiting pin 310 through the first limiting portion 312.

[0057] Furthermore, the stop assembly 300 also includes a first locking member 320, which is connected to one end of the first plug-in portion 311 away from the first stop portion 312 and can abut against the other side of the first extension portion 130. Specifically, in this embodiment, the first stop hole 131 is a through hole, and the stop pin 310 extends from one end of the first stop hole 131 and extends from the other end of the first stop hole 131 to connect with the first locking member 320. This allows the stop pin 310 to be stably inserted into the first stop hole 131 under the cooperation of the first stop portion 312 and the first locking member 320. Optionally, the stop pin 310 is a long bolt, with the bolt head of the stop pin 310 forming the first stop portion 312, the threaded rod of the stop pin 310 forming the first plug-in portion 311, and the first locking member 320 being a nut screwed onto the long bolt. This provides a simple structure, ease of assembly, and low processing cost.

[0058] In other embodiments, the first locking member 320 may not be provided. In this example, the limiting pin 310 is a long bolt, the bolt head of the limiting pin 310 forms the first limiting portion 312, the threaded rod of the limiting pin 310 forms the first plug-in portion 311, and the inner wall of the first limiting hole 131 is provided with an internal thread section. The limiting pin 310 is directly screwed into the first limiting hole 131, which can also achieve the above-mentioned effect.

[0059] Optionally, at least one limiting seal 330 is provided between the limiting pin 310 and the first limiting hole 131. The provision of the limiting seal 330 prevents external dust from entering through the gap between the limiting pin 310 and the first limiting hole 131, thereby affecting the service life of the entire first connecting pipe 100. In this embodiment, there are two limiting seals 330, which are spaced apart along the axis of the limiting pin 310 to ensure a good sealing effect while reducing the number of limiting seals 330, thereby reducing processing costs. The limiting seal 330 is a rubber sealing ring, which has a good sealing effect and a low cost.

[0060] To ensure the stability of the installation of the limiting seal 330 , a first installation groove 1311 for installing the limiting seal 330 is provided on the hole wall of the first limiting hole 131 to prevent the limiting seal 330 from falling off or shifting.

[0061] Figure 11 Shown Figure 1 Schematic cross-sectional view of the second limiting hole 141. Figure 12 FIG. 1 shows a cross-sectional view of the first connecting pipe 100 provided in this embodiment at the second limiting hole 141. Figure 11-12 Combined with Figure 8 As shown, the anti-rotation pin 410 includes a second connecting portion 411 and a second limiting portion 412 connected to each other. The second connecting portion 411 is inserted into the second limiting hole 141, and the second limiting portion 412 can abut against one side of the second extension portion 140. By providing the second connecting portion 411 and the second limiting portion 412 connected to each other, the second limiting portion 412 can limit the insertion depth of the second connecting portion 411 in the second limiting hole 141, ensuring that the second connecting portion 411 abuts against the first anti-rotation flat surface 223 while the second limiting portion 412 is exposed outside the second limiting hole 141, thereby facilitating the operator's installation and removal of the entire anti-rotation pin 410 through the second limiting portion 412.

[0062] Furthermore, the anti-rotation assembly 400 includes a second locking member 420, which is connected to one end of the second plug-in portion 411 away from the second stopper 412 and can abut against the other side of the second extension portion 140. Specifically, in this embodiment, the second stopper hole 141 is a through hole, and the anti-rotation pin 410 extends from one end of the second stopper hole 141 and extends from the other end of the second stopper hole 141 to connect with the second locking member 420. This allows the anti-rotation pin 410 to be stably inserted into the second stopper hole 141 under the cooperation of the second stopper 412 and the second locking member 420. Alternatively, the anti-rotation pin 410 can be a long bolt, with its bolt head forming the second stopper 412, its threaded rod forming the second plug-in portion 411, and the second locking member 420 being a nut screwed onto the long bolt. This provides a simple structure, ease of assembly, and low manufacturing costs.

[0063] In other embodiments, the second locking member 420 may not be provided. In this example, the anti-rotation pin 410 is a long bolt, the bolt head of the anti-rotation pin 410 forms the second limiting portion 412, the threaded rod of the anti-rotation pin 410 forms the second plug-in portion 411, and the inner wall of the second limiting hole 141 is provided with an internal threaded section. The anti-rotation pin 410 is directly screwed into the second limiting hole 141, which can also achieve the above-mentioned effect.

[0064] like Figure 4 、 Figure 8 、 Figure 10 and Figure 11 As shown, in this embodiment, the first anti-rotation flat surface 223 is located at the end of the second pipe joint 220 away from the second pipe body 210. This design facilitates the machining of the first anti-rotation flat surface 223. However, if external dust enters the second limiting hole 141 through the gap between the anti-rotation pin 410 and the second limiting hole 141, it can easily flow along the first anti-rotation flat surface 223 into the flow path between the first connecting pipe 100 and the second connecting pipe 200. To address this issue, at least one anti-rotation seal 430 is provided between the anti-rotation pin 410 and the second limiting hole 141. The provision of the anti-rotation seal 430 prevents external dust from entering through the gap between the anti-rotation pin 410 and the second limiting hole 141, thereby reducing the service life of the entire first connecting pipe 100. In this embodiment, two anti-rotation seals 430 are provided, spaced apart along the axis of the anti-rotation pin 410. This ensures a good sealing effect while reducing the number of anti-rotation seals 430, thereby reducing machining costs. The anti-rotation seal 430 is a rubber sealing ring, which has good sealing effect and low cost.

[0065] To ensure the stability of the installation of the anti-rotation seal 430 , a second installation groove 1411 for installing the anti-rotation seal 430 is provided on the hole wall of the second limiting hole 141 to prevent the anti-rotation seal 430 from falling off or shifting.

[0066] To further enhance the anti-rotation effect of anti-rotation pin 410, a second anti-rotation surface (not shown) is provided on the sidewall of anti-rotation pin 410. This second anti-rotation surface aligns with first anti-rotation surface 223, increasing the contact area between anti-rotation pin 410 and first anti-rotation surface 223 and improving the anti-rotation effect between first connecting tube 100 and second connecting tube 200. In some embodiments, anti-rotation pin 410 can be configured as a prismatic structure, thereby forming the second anti-rotation surface on one side of anti-rotation pin 410. In other embodiments, anti-rotation pin 410 can be configured as a cylindrical structure, with the second anti-rotation surface machined onto the side of the cylinder.

[0067] To ensure the sealing performance when the first connecting pipe 100 and the second connecting pipe 200 are connected, Figure 7-Figure 8As shown, in this embodiment, at least one connection seal 500 is sleeved on the second pipe joint 220. Optionally, there are two connection seals 500, which are spaced apart along the axial direction of the second pipe joint 220. Specifically, the two connection seals 500 are located on either side of the stop pin 310. The connection seal 500 located on the side closer to the second pipe body 210 not only performs a sealing function but also serves as a dustproof function to prevent external dust from entering through the gap between the first connecting pipe 100 and the second connecting pipe 200. In addition, the arrangement of the connection seal 500, the stop seal 330, and the anti-rotation seal 430 can achieve a multiple sealing effect, further ensuring the sealing effect between the first connecting pipe 100 and the second connecting pipe 200. Of course, this embodiment does not limit the number of connection seals 500, and it can also be set to three, four, five, or even more.

[0068] Optionally, a receiving groove 222 for accommodating the connection seal 500 is further provided on the outer wall of the second pipe joint 220 to ensure stable assembly of the connection seal 500 and prevent it from falling off. In this embodiment, each connection seal 500 corresponds to a corresponding receiving groove 222 to prevent the connection seal 500 from moving axially along the second pipe joint 220 within the receiving groove 222 when the receiving groove 222 is wide.

[0069] In other embodiments, the accommodating groove 222 may be provided on the inner wall of the first pipe joint 120 , and the connecting seal 500 may be installed in the corresponding accommodating groove 222 , which can also achieve the above-mentioned effects.

[0070] To facilitate processing, in this embodiment, the first pipe joint 120 and the first pipe body 110 are an integrally formed structure, and the second pipe joint 220 and the second pipe body 210 are an integrally formed structure. This arrangement can omit the assembly process between multiple parts and improve assembly efficiency.

[0071] 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 pipeline connection structure, comprising a first connecting pipe (100) and a second connecting pipe (200), wherein 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), and the first pipe joint (120) can be sleeved outside the second pipe joint (220), characterized in that: The pipeline connection structure also includes: A limiting assembly (300) includes a limiting pin (310), a first limiting hole (131) communicating with an internal passage of the first pipe joint (120) is provided on a side portion thereof, a limiting groove (221) is provided on a side wall of the second pipe joint (220), and the limiting pin (310) is inserted into the first limiting hole (131) and partially limited in the limiting groove (221); The anti-rotation assembly (400) includes an anti-rotation pin (410), a second limiting hole (141) connected to an internal channel of the first pipe joint (120) is provided on a side portion thereof, a first anti-rotation plane (223) is provided on a side wall of the second pipe joint (220), and the anti-rotation pin (410) is inserted into the second limiting hole (141) and can abut against the first anti-rotation plane (223).

2. The pipeline connection structure according to claim 1, characterized in that: A first extension portion (130) is protruded from the side wall of the first pipe joint (120), and the first limiting hole (131) is opened on the first extension portion (130); and / or A second extension portion (140) is protruding from the side wall of the first pipe joint (120), and the second limiting hole (141) is opened on the second extension portion (140).

3. The pipeline connection structure according to claim 2, characterized in that: The first extension portion (130) and the second extension portion (140) are located on the same side of the axial direction of the first pipe joint (120); or The first extension portion (130) and the second extension portion (140) are respectively located on two sides of the first pipe joint (120) in the axial direction.

4. The pipeline connection structure according to claim 2, characterized in that: The limiting pin (310) comprises a first plug-in portion (311) and a first limiting portion (312) connected to each other, the first plug-in portion (311) being plugged into the first limiting hole (131), and the first limiting portion (312) being capable of abutting against one side of the first extending portion (130); and / or The anti-rotation pin (410) comprises a second plug-in portion (411) and a second limiting portion (412) connected to each other, wherein the second plug-in portion (411) is plugged into the second limiting hole (141), and the second limiting portion (412) can abut against one side of the second extension portion (140).

5. The pipeline connection structure according to claim 4, characterized in that: The limiting assembly (300) further comprises a first locking member (320), the first locking member (320) being connected to an end of the first plug-in portion (311) away from the first limiting portion (312), and the first locking member (320) being capable of abutting against the other side of the first extending portion (130); and / or The anti-rotation assembly (400) further includes a second locking member (420), the second locking member (420) being connected to an end of the second plug-in portion (411) away from the second limiting portion (412), and the second locking member (420) being capable of abutting against the other side of the second extending portion (140).

6. The pipeline connection structure according to claim 1, characterized in that: At least one limiting seal (330) is provided between the limiting pin (310) and the first limiting hole (131); and / or At least one anti-rotation seal (430) is provided between the anti-rotation pin (410) and the second limiting hole (141).

7. The pipeline connection structure according to claim 6, characterized in that: A first mounting groove (1311) for mounting the limiting seal (330) is provided on the hole wall of the first limiting hole (131); and / or A second mounting groove (1411) for mounting the anti-rotation seal (430) is provided on the hole wall of the second limiting hole (141).

8. The pipeline connection structure according to any one of claims 1 to 7, characterized in that: A second anti-rotation plane is provided on the side wall of the anti-rotation pin (410).

9. The pipeline connection structure according to any one of claims 1 to 7, characterized in that: At least one connection seal (500) is provided between the first pipe joint (120) and the second pipe joint (220).

10. The pipeline connection structure according to claim 9, characterized in that: The number of the connecting seals (500) is two, and the two connecting seals (500) are respectively located on both sides of the limiting pin (310).

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