Rubber expansion joint structure for negative pressure pipeline connection

Abstract

The utility model discloses a rubber expansion joint structure for negative pressure pipeline connection, which relates to the technical field of pipeline connection and comprises an expansion joint, first connecting pieces are arranged at two ends of the expansion joint, and second connecting pieces are respectively sleeved at two ends of the expansion joint. Two pipelines needing to be connected are integrally connected through the expansion joint through the first connecting assembly and the second connecting assembly, then the supporting piece made of the elastic material is arranged in the expansion joint, it is guaranteed that the expansion joint can be quickly deformed and recovered, and meanwhile the multiple limiting connecting assemblies are arranged outside the expansion joint, so that the expansion joint can be conveniently connected. And excessive deformation of the expansion joint is prevented. The effect that the expansion joint can achieve rapid rebounding and axial and radial compensation compression is effectively guaranteed, and the connection design requirement of the expansion joint is met. And the problem that the design requirement cannot be met by adopting a rigid negative pressure ring in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a rubber expansion joint structure for negative pressure pipeline connection. Background Technique

[0002] When connecting negative pressure pipelines, it is usually necessary to set connection structures at both ends of the connecting pipelines to connect the pipelines so that the pipelines can flow normally. For the connection structure between pipelines, rubber expansion joints are generally used. The main function of the rubber expansion joint is to compensate for the axial and radial tensile compression of the pipeline.

[0003] At present, a negative pressure ring usually needs to be added inside the rubber expansion joint for negative pressure pipeline connection. Traditional rubber expansion joints generally use rigid negative pressure rings. When the rubber expansion joint compensates for axial tension, the rigid negative pressure ring will limit the height of the arched position of the product, resulting in a reduction in the axial tension compensation amount and not meeting the design requirements. Therefore, the connection effect of the negative pressure pipeline is affected, and then the normal flow of the pipeline is easily affected. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the use of a rigid negative pressure ring in the prior art cannot meet the design requirements, and to propose a rubber expansion joint structure for negative pressure pipeline connection.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A rubber expansion joint structure for negative pressure pipeline connection, comprising:

[0007] An expansion joint, first connectors are arranged at both ends of the expansion joint, second connectors are respectively sleeved at both ends of the expansion joint, the two second connectors are located between the two first connectors, and the two second connectors respectively abut against one side of the two first connectors;

[0008] Wherein, a support member is arranged inside the expansion joint, the outer periphery of the support member fits against the inner wall of the expansion joint, and the material of the support member is an elastic material;

[0009] A first connection assembly, the first connection assembly is arranged at one end of the expansion joint, one end of the first connection assembly is connected to the expansion joint, and the other end of the first connection assembly is connected to a pipeline;

[0010] A second connection assembly, the second connection assembly is arranged at the other end of the expansion joint, one end of the second connection assembly is connected to the expansion joint, and the other end of the second connection assembly is connected to another pipeline;

[0011] Multiple locking components, a plurality of said locking components are respectively arranged on the first connecting component and the second connecting component, one end of the expansion joint is locked and connected to the first connecting component through a plurality of said locking components, and the other end of the expansion joint is locked and connected to the second connecting component through a plurality of said locking components;

[0012] Multiple limit connecting components, a plurality of said limit connecting components are arranged outside the expansion joint, the first connecting component and the second connecting component are respectively located at both ends of a plurality of said limit connecting components, and the outer sides of the first connecting component and the second connecting component are respectively connected to a plurality of said limit connecting components in a limited way through a plurality of said locking components.

[0013] In a feasible solution, the support member has a multi-layered swirling structure, and the outside of the multi-layered swirling structure of the support member is attached to the inner wall of the expansion joint.

[0014] In a feasible solution, the support member is in the shape of a multi-layered spring.

[0015] In a feasible solution, the first connecting component and the second connecting component have the same structure, the first connecting component and the second connecting component are respectively arranged at both ends of the expansion joint, and the first connecting component and the second connecting component are symmetrically arranged at both ends of the expansion joint.

[0016] In a feasible solution, the first connecting component or the second connecting component includes:

[0017] A third connecting piece, the third connecting piece is arranged on one end of the expansion joint, and the third connecting piece is attached and abutted against the first connecting piece;

[0018] A docking sleeve, one end of the docking sleeve is arranged at a position away from the expansion joint of the third connecting piece, one end of the docking sleeve is connected to the third connecting piece, and the other end of the docking sleeve is connected to a pipeline;

[0019] Both ends of the expansion joint are respectively connected to two pipelines to be connected through the docking sleeves in the first connecting component and the second connecting component

[0020] Wherein, a plurality of locking holes are arranged on the first connecting piece, the second connecting piece and the third connecting piece, and the plurality of locking holes on the first connecting piece, the second connecting piece and the third connecting piece are aligned in hole positions one by one.

[0021] In a feasible solution, the docking sleeve is in a conical opening shape, the large opening of the docking sleeve is close to the expansion joint, and the small opening of the docking sleeve is located inside the pipeline.

[0022] In a feasible solution, the locking component includes:

[0023] A second connecting rod, the second connecting rod sequentially passes through a third connecting member, a first connecting member and a second connecting member through a locking hole, and a plurality of the second connecting rods are respectively used to lock and connect a first connecting assembly and a second connecting assembly to two ends of an expansion joint;

[0024] Two locking nuts, the two locking nuts are respectively threadedly connected to two ends of the second connecting rod, one of the locking nuts is in abutting connection with one end of the second connecting member away from the expansion joint, and the other locking nut is in abutting connection with one end of the third connecting member away from the expansion joint.

[0025] In a feasible solution, the locking assembly further includes:

[0026] Two clamping plates, on one side of each of the clamping plates, there is provided a clamping protrusion, the two clamping plates are both sleeved on the second connecting rod, one of the clamping plates is arranged between the locking nut and the third connecting member, and the clamping protrusion on the clamping plate is clamped on the third connecting member; the other clamping plate is arranged between the locking nut and the second connecting member, and the clamping protrusion on the clamping plate is clamped on the second connecting member.

[0027] In a feasible solution, the limiting connection assembly includes:

[0028] A first limiting plate, the first limiting plate is arranged on the first connecting assembly, and the first limiting plate is locked and connected to the first connecting assembly through the locking assembly;

[0029] A second limiting plate, the second limiting plate is arranged on the second connecting assembly, and the second limiting plate is locked and connected to the second connecting assembly through the locking assembly;

[0030] A first connecting rod, on both ends of the first connecting rod, there are provided limiting grooves, the first connecting rod sequentially passes through the first limiting plate and the second limiting plate, and the first limiting plate and the second limiting plate respectively slide in the two limiting grooves.

[0031] In a feasible solution, both ends of the first connecting rod are provided with a first limiting sleeve and a second limiting sleeve;

[0032] On one end of the first connecting rod, one end of the first limiting sleeve is in abutting connection with one side of the first limiting plate, and one end of the second limiting sleeve is in abutting connection with the other side of the first limiting plate;

[0033] On the other end of the first connecting rod, one end of the first limiting sleeve is in abutting connection with one side of the second limiting plate, and one end of the second limiting sleeve is in abutting connection with the other side of the second limiting plate;

[0034] Among them, the first limiting sleeve and the second limiting sleeve are arranged at both ends of the first connecting rod with a gap therebetween.

[0035] The beneficial effects of the present utility model are as follows:

[0036] In the present utility model, between two pipes to be connected, an expansion joint is integrally connected through a first connecting component and a second connecting component. Then, a support member made of an elastic material is arranged inside the expansion joint, ensuring that the expansion joint can quickly deform and recover. At the same time, a plurality of limiting connection components are arranged outside the expansion joint to prevent the expansion joint from deforming excessively. That is, it effectively ensures that the expansion joint can achieve the effects of rapid rebound and axial and radial compensation compression, meeting the connection design requirements of the expansion joint. That is, it effectively solves the problem that the rigid negative pressure ring in the prior art cannot meet the design requirements. Description of the Drawings

[0037] Figure 1 It is an overall schematic diagram of a rubber expansion joint structure for negative pressure pipeline connection provided in an embodiment of the present utility model;

[0038] Figure 2 It is an exploded schematic diagram of a rubber expansion joint structure for negative pressure pipeline connection provided in an embodiment of the present utility model;

[0039] Figure 3 It is a schematic diagram of a support member structure in a rubber expansion joint structure for negative pressure pipeline connection provided in an embodiment of the present utility model;

[0040] Figure 4 It is a schematic diagram of a limiting connection component structure in a rubber expansion joint structure for negative pressure pipeline connection provided in an embodiment of the present utility model;

[0041] Figure 5 It is a schematic diagram of a locking component structure in a rubber expansion joint structure for negative pressure pipeline connection provided in an embodiment of the present utility model.

[0042] The markings in the figure are shown as follows:

[0043] 1. Expansion joint; 11. First connecting piece; 12. Support member; 13. Second connecting piece;

[0044] 2. Limiting connection component; 21. First limiting plate; 22. Second limiting plate; 23. First connecting rod; 231. First limiting sleeve; 232. Second limiting sleeve;

[0045] 3. First connecting component; 31. Third connecting piece; 32. Docking sleeve;

[0046] 4. Second connecting rod; 41. Locking nut; 42. Clamping plate; 421. Clamping protrusion;

[0047] 5. The second connection component. Detailed implementation mode

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0050] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. 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 situations.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0052] Embodiment

[0053] Refer to Figures 1 to 5, in order to solve the problem in the prior art that a rigid negative pressure ring cannot meet the design requirements, in this embodiment, a rubber expansion joint 1 structure for negative pressure pipeline connection is provided. The rubber expansion joint 1 structure includes: an expansion joint 1, a support member 12, a first connection assembly 3, a second connection assembly 5, and a locking assembly. The expansion joint 1 is made of rubber and is in a sleeve shape. First connectors 11 are provided at both ends of the expansion joint 1. Second connectors 13 are respectively sleeved at both ends of the expansion joint 1. The two second connectors 13 are located between the two first connectors 11, and the two second connectors 13 respectively abut against one side of the first connectors 11, that is, one first connector 11 and one second connector 13 are provided at both ends of the expansion joint 1 respectively, so as to facilitate subsequent alignment connection of the expansion joint 1 with the first connection assembly 3 and the second connection assembly 5 respectively. Among them, in order to meet the requirement of enhancing the deformation recovery ability of the dynamic compensation of the expansion joint 1, a support member 12 is arranged inside the expansion joint 1. The outer periphery of the support member 12 fits against the inner wall of the expansion joint 1, and the material of the support member 12 is an elastic material, so as to enhance the deformation recovery ability of the dynamic compensation of the expansion joint 1. The first connection assembly 3 is arranged at one end of the expansion joint 1. One end of the first connection assembly 3 is connected to the expansion joint 1, and the other end of the first connection assembly 3 is connected to a pipeline. The second connection assembly 5 is arranged at the other end of the expansion joint 1. One end of the second connection assembly 5 is connected to the expansion joint 1, and the other end of the second connection assembly 5 is connected to another pipeline. That is, the expansion joint 1 is respectively connected to two pipelines that need to be connected through the first connection assembly 3 and the second connection assembly 5, so as to enable normal flow between the two pipelines that need to be connected. A plurality of locking assemblies are respectively arranged on the first connection assembly 3 and the second connection assembly 5. The first connection assembly 3 is locked and connected to one end of the expansion joint 1 through the plurality of locking assemblies, and the second connection assembly 5 is locked and connected to the other end of the expansion joint 1 through the plurality of locking assemblies. That is, the first connection assembly 3 and the second connection assembly 5 are respectively connected to both ends of the expansion joint 1 through the plurality of locking assemblies. In this embodiment, since the two pipelines that need to be connected are integrally connected by the expansion joint 1 through the first connection assembly 3 and the second connection assembly 5, and at this time, the two pipelines that need to be connected are soft-connected through the expansion joint 1. Therefore, in order to ensure the stability of the connection between the two pipelines that need to be connected, the rubber expansion joint 1 structure further includes: a plurality of limit connection assemblies 2. The plurality of limit connection assemblies 2 are arranged outside the expansion joint 1. The first connection assembly 3 and the second connection assembly 5 are respectively located at both ends of the plurality of limit connection assemblies 2. The outer sides of the first connection assembly 3 and the second connection assembly 5 are respectively limited and connected to the plurality of limit connection assemblies 2 through the plurality of locking assemblies.In this embodiment, the expansion joint 1 is integrally connected between two pipes to be connected through the first connection component 3 and the second connection component 5. Then, a support member 12 made of an elastic material is arranged inside the expansion joint 1 to ensure that the expansion joint 1 can quickly deform and recover. At the same time, a plurality of limit connection components 2 are arranged outside the expansion joint 1 to prevent the expansion joint 1 from deforming excessively. That is, it effectively ensures that the expansion joint 1 can achieve the effects of rapid rebound and axial and radial compensation compression, meeting the connection design requirements of the expansion joint 1. That is, it effectively solves the problem that the rigid negative pressure ring in the prior art cannot meet the design requirements.

[0054] Referring to Figure 3 , in order to enable the support member 12 to support the deformation of the expansion joint 1, the support member 12 has a multi-layered spiral structure, and the outside of the multi-layered spiral structure of the support member 12 is attached to the inner wall of the expansion joint 1, so as to realize that when the expansion joint 1 deforms, it can support the deformation and recovery of the expansion joint 1, and avoid the occurrence of excessive deformation of the expansion joint 1. Preferably, the support member 12 is in the shape of a multi-layer spring.

[0055] Referring to Figure 1 and Figure 2, in this embodiment, the first connection assembly 3 and the second connection assembly 5 have the same structure. The first connection assembly 3 and the second connection assembly 5 are respectively arranged at both ends of the expansion joint 1, and the first connection assembly 3 and the second connection assembly 5 are symmetrically arranged at both ends of the expansion joint 1. Specifically, taking a first connection assembly 3 as an example for description, the first connection assembly 3 includes: a third connecting member 31 and a docking sleeve 32. The third connecting member 31 is in a circular ring shape and is arranged at one end of the expansion joint 1, and the third connecting member 31 fits and abuts against the first connecting member 11. Among them, in order to ensure the stability of the connection between one end of the expansion joint 1 and the pipeline through the first connection assembly 3, a number of locking holes are provided on the first connecting member 11, the second connecting member 13, and the third connecting member 31. The number of locking holes on the first connecting member 11, the second connecting member 13, and the third connecting member 31 are aligned one by one, so that the locking assembly can integrally connect and lock the first connecting member 11, the second connecting member 13, and the third connecting member 31 through a number of locking holes (not marked in the figure). One end of the docking sleeve 32 is arranged at a position away from the expansion joint 1 of the third connecting member 31. One end of the docking sleeve 32 is connected to the third connecting member 31, and the other end of the docking sleeve 32 is connected to a pipeline, so as to realize the connection of one end of the expansion joint 1 to a pipeline through the docking sleeve 32 and the first connecting member 11, the second connecting member 13, and the third connecting member 31. That is, here, one end of the expansion joint 1 is connected to the docking sleeve 32 on the third connecting member 31 through the first connecting member 11 and the second connecting member 13, and then the docking sleeve 32 is connected to a pipeline to realize the connection between the expansion joint 1 and the pipeline; similarly, the second connection assembly 5 also includes: a third connecting member 31 and a docking sleeve 32. The third connecting member 31 on the second connection assembly 5 abuts and fits against the first connecting member 11 on the other end of the expansion joint 1, and at the same time, the docking sleeve 32 on the second connection assembly 5 is connected to another pipeline, so as to realize the connection of both ends of the expansion joint 1 to two pipelines to be connected through the docking sleeves 32 in the first connection assembly 3 and the second connection assembly 5 respectively. In this embodiment, in order to ensure the connection effect between the docking sleeve 32 and the two pipelines to be connected, the docking sleeve 32 is in a tapered opening shape. The large opening of the docking sleeve 32 is close to the expansion joint 1, and the small opening of the docking sleeve 32 is located inside the pipeline, so as to facilitate the alignment connection between the docking sleeve 32 and the pipeline.

[0056] Refer to Figure 1 and Figure 5, in this embodiment, a plurality of the locking components are respectively arranged at both ends of the expansion joint 1. The plurality of locking components sequentially penetrate through the third connecting member 31, the first connecting member 11 and the second connecting member 13. The plurality of locking components respectively connect and lock the first connecting assembly 3 and the second connecting assembly 5 to both ends of the expansion joint 1. For the convenience of description, one of the locking components is taken as an example for illustration. Specifically, the locking component includes: a second connecting rod 4 and two locking nuts 41. The second connecting rod 4 sequentially penetrates through the third connecting member 31, the first connecting member 11 and the second connecting member 13 through the locking holes. The plurality of second connecting rods 4 are used to respectively lock and connect the first connecting assembly 3 and the second connecting assembly 5 to both ends of the expansion joint 1. The two locking nuts 41 are respectively threadedly connected to both ends of the second connecting rod 4. One locking nut 41 is in abutting connection with the end of the second connecting member 13 away from the expansion joint 1, and the other locking nut 41 is in abutting connection with the end of the third connecting member 31 away from the expansion joint 1. That is, the third connecting member 31, the first connecting member 11 and the second connecting member 13 are arranged between the two locking nuts 41, and the two locking nuts 41 are used to lock and connect the third connecting member 31, the first connecting member 11 and the second connecting member 13, so as to realize the connection between both ends of the expansion joint 1 and the first connecting assembly 3 and the second connecting assembly 5 respectively. In this embodiment, in order to ensure the locking effect of the two locking nuts 41, the locking component further includes: two clamping plates 42. One side of each clamping plate 42 is provided with a clamping protrusion 421. The two clamping plates 42 are both sleeved on the second connecting rod 4. One clamping plate 42 is arranged between the locking nut 41 and the third connecting member 31, and the clamping protrusion 421 on the clamping plate 42 is clamped on the third connecting member 31; the other clamping plate 42 is arranged between the locking nut 41 and the second connecting member 13, and the clamping protrusion 421 on the clamping plate 42 is clamped on the second connecting member 13, so as to realize that the clamping protrusions 421 on the clamping plates 42 cooperate with the locking nuts 41 to limit and lock the positions of the first connecting member 11, the second connecting member 13 and the third connecting member 31 respectively. Preferably, in this embodiment, the second connecting rod 4 is a screw rod.

[0057] Refer to Figure 1 , Figure 4 and Figure 5, to ensure the stability of the connection between two pipes that need to be connected, two or more limit connection components 2 can be arranged on the outer side of the expansion joint 1, and the limit connection components 2 are configured to support in cooperation with the deformation of the expansion joint 1, so as to ensure the stability of the connection between two pipes that need to be connected. For the convenience of describing the limit connection component 2, in this embodiment, one limit connection component 2 is taken as an example for illustration. Specifically, the limit connection component 2 includes: a first limit plate 21, a second limit plate 22, a first connecting rod 23 and two limit slots. The first limit plate 21 is arranged on the first connection component 3, and the first limit plate 21 is locked and connected to the first connection component 3 through a locking component. The second limit plate 22 is arranged on the second connection component 5, and the second limit plate 22 is locked and connected to the second connection component 5 through a locking component. Limit slots are arranged at both ends of the first connecting rod 23. The first connecting rod 23 sequentially passes through the first limit plate 21 and the second limit plate 22, and the first limit plate 21 and the second limit plate 22 slide in the two limit slots respectively, so as to satisfy the dynamic compensation of the distance of the expansion joint 1 under different deformation conditions. In this embodiment, in order to make the distance of the limit slots on the first connecting rod 23 adjustable to meet the use requirements in different situations, the limit slots at both ends of the first connecting rod 23 can be arranged in the following way: first limit sleeves 231 and second limit sleeves 232 are arranged at both ends of the first connecting rod 23, and the first limit sleeves 231 and the second limit sleeves 232 are arranged at intervals at both ends of the first connecting rod 23. That is, one end of the first limit sleeve 231 is in abutting connection with one surface of the first limit plate 21, and one end of the second limit sleeve 232 is in abutting connection with the other surface of the first limit plate 21; and one end of the first limit sleeve 231 is in abutting connection with one surface of the second limit plate 22, and one end of the second limit sleeve 232 is in abutting connection with the other surface of the second limit plate 22. That is, first limit sleeves 231 and second limit sleeves 232 are arranged at one end of the first connecting rod 23, and the first limit plate 21 or the second limit plate 22 slides between the first limit sleeve 231 and the second limit sleeve 232, so as to make the limit slots adjustable to meet the use environment of the expansion joint 1 with different requirements.

[0058] As mentioned above, the above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A rubber expansion joint structure for negative pressure pipeline connection, characterized in that, Comprising: An expansion joint, with first connectors provided at both ends of the expansion joint. Second connectors are respectively sleeved on both ends of the expansion joint. The two second connectors are located between the two first connectors, and the two second connectors respectively abut against one side of the two first connectors; Wherein, a support member is provided inside the expansion joint. The outer periphery of the support member fits against the inner wall of the expansion joint, and the material of the support member is an elastic material; A first connection assembly, which is provided at one end of the expansion joint. One end of the first connection assembly is connected to the expansion joint, and the other end of the first connection assembly is connected to a pipeline; A second connection assembly, which is provided at the other end of the expansion joint. One end of the second connection assembly is connected to the expansion joint, and the other end of the second connection assembly is connected to another pipeline; Multiple locking assemblies, which are respectively provided on the first connection assembly and the second connection assembly. The first connection assembly is locked and connected to one end of the expansion joint through the multiple locking assemblies, and the second connection assembly is locked and connected to the other end of the expansion joint through the multiple locking assemblies; Multiple limit connection assemblies, which are provided outside the expansion joint. The first connection assembly and the second connection assembly are respectively located at both ends of the multiple limit connection assemblies. The outer sides of the first connection assembly and the second connection assembly are respectively limited and connected to the multiple limit connection assemblies through the multiple locking assemblies.

2. The rubber expansion joint structure for negative pressure pipeline connection according to claim 1, characterized in that, The support member has a multi-layer spiral structure, and the outside of the multi-layer spiral structure of the support member fits against the inner wall of the expansion joint.

3. The rubber expansion joint structure for negative pressure pipeline connection according to claim 2, characterized in that, The support member is in the shape of a multi-layer spring.

4. A rubber expansion joint structure for negative pressure pipeline connection according to claim 1, characterized in that, The first connection assembly and the second connection assembly have the same structure. The first connection assembly and the second connection assembly are respectively provided at both ends of the expansion joint, and the first connection assembly and the second connection assembly are symmetrically arranged at both ends of the expansion joint.

5. The rubber expansion joint structure for negative pressure pipeline connection according to claim 4, characterized in that, The first connection assembly or the second connection assembly includes: A third connector, which is provided at one end of the expansion joint and fits and abuts against the first connector; A docking sleeve, one end of which is provided at the part of the third connector away from the expansion joint. One end of the docking sleeve is connected to the third connector, and the other end of the docking sleeve is connected to the pipeline; Both ends of the expansion joint are respectively connected to two pipelines to be connected through the docking sleeves in the first connection assembly and the second connection assembly Wherein, a number of locking holes are provided on the first connector, the second connector, and the third connector, and the positions of the number of locking holes on the first connector, the second connector, and the third connector are aligned one by one.

6. A rubber expansion joint structure for negative pressure pipeline connection according to claim 5, characterized in that, The docking sleeve has a tapered opening shape. The large opening of the docking sleeve is close to the expansion joint, and the small opening of the docking sleeve is located inside the pipeline.

7. A rubber expansion joint structure for negative pressure pipeline connection according to claim 5 or 6, characterized in that, The locking assembly includes: A second connecting rod, which sequentially penetrates through the third connector, the first connector, and the second connector through the locking holes. The multiple second connecting rods are used to respectively lock and connect the first connection assembly and the second connection assembly to both ends of the expansion joint; Two locking nuts, the two locking nuts are respectively threadedly connected to both ends of the second connecting rod, one of the locking nuts is abutted and connected to the end of the second connecting member away from the expansion joint, and the other locking nut is abutted and connected to the end of the third connecting member away from the expansion joint.

8. A rubber expansion joint structure for negative pressure pipeline connection according to claim 7, characterized in that, The locking assembly further includes: Two clamping plates, clamping protrusions are provided on one side of each clamping plate, the two clamping plates are sleeved on the second connecting rod, one clamping plate is arranged between the locking nut and the third connecting member, and the clamping protrusion on the clamping plate is clamped on the third connecting member; the other clamping plate is arranged between the locking nut and the second connecting member, and the clamping protrusion on the clamping plate is clamped on the second connecting member.

9. The rubber expansion joint structure for negative pressure pipeline connection according to claim 8, characterized in that, The limit connection assembly includes: A first limit plate, the first limit plate is arranged on the first connection assembly, and the first limit plate is locked and connected to the first connection assembly through the locking assembly; A second limit plate, the second limit plate is arranged on the second connection assembly, and the second limit plate is locked and connected to the second connection assembly through the locking assembly; A first connecting rod, limit grooves are provided at both ends of the first connecting rod, the first connecting rod sequentially penetrates through the first limit plate and the second limit plate, and the first limit plate and the second limit plate slide in the two limit grooves respectively.

10. A rubber expansion joint structure for negative pressure pipeline connection according to claim 9, characterized in that, Both ends of the first connecting rod are provided with a first limit sleeve and a second limit sleeve; At one end of the first connecting rod, one end of the first limit sleeve is abutted and connected to one side of the first limit plate, and one end of the second limit sleeve is abutted and connected to the other side of the first limit plate; At the other end of the first connecting rod, one end of the first limit sleeve is abutted and connected to one side of the second limit plate, and one end of the second limit sleeve is abutted and connected to the other side of the second limit plate; Wherein, the first limit sleeve and the second limit sleeve are arranged at intervals at both ends of the first connecting rod.

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