Anti-corrosion connecting structure

Abstract

The utility model relates to the technical field of pipeline connection corrosion prevention, and discloses an anti-corrosion connecting structure which is used for connecting a first pipeline and a second pipeline and comprises a connecting pipe fitting and a limiting plug connector, and the first pipeline and the second pipeline extend into the connecting pipe fitting from the two ends of the connecting pipe fitting respectively. The first pipeline and the second pipeline are arranged at intervals in the axial direction of the connecting pipe fitting, and the connecting pipe fitting is insulated from the first pipeline and the second pipeline; limiting plug connectors are arranged at the two ends of the connecting pipe fitting and used for fixing the first pipeline and the second pipeline into the connecting pipe fitting. According to the anti-corrosion connecting structure, the first pipeline and the second pipeline are arranged at intervals in the axial direction of the connecting pipe fitting, and when the first pipeline and the second pipeline are made of dissimilar metal materials, due to the fact that the connecting pipe fitting is insulated from the first pipeline and the second pipeline, the problem of electrochemical corrosion between the first pipeline and the second pipeline which are made of the dissimilar metal materials cannot be generated between the first pipeline and the second pipeline which are made of the dissimilar metal materials.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting pipes, in particular to an anti-corrosion connecting structure. Background Art

[0002] At present, the heat exchangers used in gas water heaters mostly use copper tubes. During long-term use, due to the high concentration of HCO3 in the water used in some areas, - This will cause copper pipes to corrode and leak. In order to avoid corrosion of copper pipes, stainless steel pipes are usually connected to copper pipes through connecting pipe fittings, replacing some steel pipes with stainless steel pipes, but this will cause electrochemical corrosion between different metal pipes. Utility Model Content

[0003] The utility model aims to provide an anti-corrosion connection structure, which solves the technical problem of electrochemical corrosion in the existing connection between different metal pipes.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides an anti-corrosion connection structure for connecting a first pipeline and a second pipeline, the anti-corrosion connection structure comprising:

[0006] A connecting pipe, wherein the first pipeline and the second pipeline are respectively extended into the connecting pipe at two ends of the connecting pipe, and the first pipeline and the second pipeline are spaced apart along the axial direction of the connecting pipe, and the connecting pipe is insulated from the first pipeline and the second pipeline;

[0007] A limiting connector is provided at both ends of the connecting pipe, and the limiting connector is used to fix the first pipeline and the second pipeline in the connecting pipe.

[0008] The anti-corrosion connection structure is used to connect a first pipeline and a second pipeline. The first pipeline and the second pipeline extend into the connecting pipe fitting at both ends of the connecting pipe fitting respectively, and the first pipeline and the second pipeline are arranged at intervals along the axial direction of the connecting pipe fitting. The first pipeline and the second pipeline are fixed in the connecting pipe fitting by a limiting plug-in component, thereby realizing the connection between the first pipeline and the second pipeline. When the first pipeline and the second pipeline are made of heterogeneous metal materials, due to the insulation arrangement between the connecting pipe fitting and the first pipeline and the second pipeline, the problem of electrochemical corrosion will not occur between the first pipeline and the second pipeline of heterogeneous materials.

[0009] As a preferred solution of the above-mentioned anti-corrosion connection structure, the first pipeline includes a first pipe body and a first flange connected to the end of the first pipe body, the second pipeline includes a second pipe body and a second flange connected to the end of the second pipe body, the first flange and the second flange extend into the connecting pipe fitting from both ends of the connecting pipe fitting respectively, and are fixed in the connecting pipe fitting by the limiting plug-in connector, the first flange and the second flange are arranged at intervals along the axial direction of the connecting pipe fitting, and the connecting pipe fitting is insulated from the first flange and the second flange.

[0010] The first pipeline and the second pipeline are installed in the connecting pipe through the first flange and the second flange, and the connection is convenient.

[0011] As a preferred solution of the above-mentioned anti-corrosion connection structure, both ends of the connecting pipe fitting are respectively provided with a group of plug-in holes passing through the opposite side walls of the connecting pipe fitting, and the circumference of the first flange and the second flange are both provided with limiting grooves arranged opposite to the plug-in hole group, and the limiting plug-in component is penetrated through the correspondingly arranged plug-in hole group and the limiting groove to fix the first flange or the second flange in the connecting pipe fitting.

[0012] The limiting plug-in connector is plugged into the corresponding plug-in hole group and the limiting groove to fix the first flange or the second flange, and the disassembly of the limiting plug-in connector, the first flange or the second flange is convenient.

[0013] As a preferred solution of the above-mentioned anti-corrosion connection structure, each end of the connecting pipe is provided with two groups of the plug-in hole groups, and the two groups of the plug-in hole groups at each end of the connecting pipe are both plugged with a group of the limiting plug-in parts.

[0014] Each set of limiting plug-in connectors is plugged into two sets of plug-in hole groups, which can make the first flange or the second flange more securely fixed.

[0015] As a preferred solution of the above-mentioned anti-corrosion connection structure, the limiting plug-in connector includes two plug-ins arranged at an interval and a connecting portion connecting the two plug-ins, the two plug-ins are respectively inserted into the two groups of plug-in hole groups at the same end of the connecting pipe fitting, and the two plug-ins respectively pass through the limiting grooves on both sides of the first flange or the second flange, and the connecting portion is located outside the connecting pipe fitting.

[0016] The two plug-ins of the limiting plug-in connector are inserted into the two groups of plug-in holes at the same end of the connecting pipe fitting, and the two plug-ins pass through the limiting grooves on both sides of the first flange or the second flange respectively, thereby fixing the first flange or the second flange more firmly and preventing the first flange or the second flange from shaking in the connecting pipe fitting; the limiting plug-in connector has a simple structure and is easy to prepare.

[0017] As a preferred solution of the above-mentioned anti-corrosion connection structure, an anti-slip piece is provided on the outer wall of the connecting pipe, and the connecting part is clamped on the anti-slip piece.

[0018] The provision of the anti-dropping piece can prevent the limiting plug-in piece from arbitrarily dropping out of the limiting plug-in hole group, thereby avoiding failure of fixing the first flange or the second flange.

[0019] As a preferred solution of the above-mentioned anti-corrosion connection structure, an anti-dropout piece is provided at both ends of the connecting pipe, and the connecting portion of each group of the limiting plug-in components is correspondingly clamped to a group of the anti-dropout pieces.

[0020] Each position-limiting connector is fixed by a set of anti-dropping parts to prevent it from dropping out, thereby limiting the random dropout of each set of position-limiting connectors.

[0021] As a preferred solution of the above-mentioned anti-corrosion connection structure, the anti-dropping member includes:

[0022] A stopper, one end of which is connected to the side wall of the connecting pipe, and the limit connector is located on one side of the stopper;

[0023] An anti-slip portion is arranged at the other end of the stop portion and protrudes from the stop portion, and the connecting portion abuts against the anti-slip portion.

[0024] The anti-slip portion of the anti-slip component abuts against the connecting portion, thereby preventing the limiting connector from arbitrarily slipping out of the plug-in hole group. The stopping portion is arranged on one side of the limiting connector, which can play a certain stopping role on the limiting connector, thereby preventing the limiting connector from being deformed due to the snap-fitting between the connecting portion and the anti-slip portion.

[0025] As a preferred solution of the above-mentioned anti-corrosion connection structure, limiting steps are respectively provided at both ends of the connecting pipe fitting, and there is a gap between the two limiting steps along the axial direction of the connecting pipe fitting. The first flange and the second flange respectively extend into the corresponding limiting steps and abut against the limiting steps.

[0026] The limiting step can limit the insertion depth of the first flange or the second flange, so that there is a gap between the first flange and the second flange, and can also avoid electrochemical corrosion when the first flange and the second flange are made of different metal materials and come into contact with each other.

[0027] As a preferred solution of the above-mentioned anti-corrosion connection structure, a receiving groove is provided in the circumference of the first flange and the second flange, and a sealing ring is placed in the receiving groove.

[0028] The accommodating groove is used to accommodate a sealing ring, and the sealing ring is used to seal the gap between the first flange or the second flange and the connecting pipe to prevent leakage.

[0029] Beneficial effects of the utility model:

[0030] The utility model proposes an anti-corrosion connection structure, which is used to connect a first pipeline and a second pipeline. The first pipeline and the second pipeline are respectively extended into the connecting pipe fitting at two ends of the connecting pipe fitting, and the first pipeline and the second pipeline are arranged at intervals along the axial direction of the connecting pipe fitting. The first pipeline and the second pipeline are fixed in the connecting pipe fitting by a limiting plug-in component, thereby realizing the connection between the first pipeline and the second pipeline. When the first pipeline and the second pipeline are made of heterogeneous metal materials, due to the insulation arrangement between the connecting pipe fitting and the first pipeline and the second pipeline, the problem of electrochemical corrosion will not occur between the first pipeline and the second pipeline of heterogeneous materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of a first pipeline and a second pipeline provided by the utility model being connected via an anti-corrosion connection structure;

[0032] Figure 2 It is a structural schematic diagram of the first pipeline, the second pipeline, and the anti-corrosion connection structure provided by the utility model to be assembled;

[0033] Figure 3 It is a partial structural schematic diagram of a first pipeline and a second pipeline provided by the utility model connected via an anti-corrosion connection structure;

[0034] Figure 4 yes Figure 3 Sectional view along line AA;

[0035] Figure 5 This is a schematic diagram of the structure of the connecting pipe provided by the utility model Figure 1 ;

[0036] Figure 6 This is a schematic diagram of the structure of the connecting pipe provided by the utility model Figure 2 ;

[0037] Figure 7 This is a schematic diagram of the structure of the connecting pipe provided by the utility model Figure 3 ;

[0038] Figure 8 yes Figure 7 Sectional view along line BB.

[0039] In the figure:

[0040] 100, first pipeline; 101, first pipe body; 102, first flange; 200, second pipeline; 201, second pipe body; 202, second flange;

[0041] 11. Connecting pipe fitting; 111. Insertion hole group; 112. Position limiting step; 12. Anti-slip part; 121. Stopper; 122. Anti-slip part;

[0042] 23. Limiting groove; 24. Accommodating groove;

[0043] 31. Position limiting connector; 311. Plug-in; 312. Connecting part;

[0044] 41. Sealing ring. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] At present, the heat exchangers used in gas water heaters mostly use copper tubes. During long-term use, due to the high concentration of HCO3 in the water used in some areas, - It will cause corrosion and leakage of copper pipes. In order to avoid corrosion of copper pipes, stainless steel pipes are usually connected to copper pipes through connecting pipe fittings, replacing some steel pipes with stainless steel pipes, but this will cause electrochemical corrosion between different metal pipes; moreover, the connection between existing connecting pipe fittings and copper pipes or stainless steel pipes is mostly welded, which is not convenient for disassembly and assembly.

[0050] In order to solve the above problems, Figure 1-Figure 4 As shown, this embodiment provides an anti-corrosion connection structure for connecting a first pipeline 100 and a second pipeline 200. The anti-corrosion connection structure includes a connecting pipe 11 and a limiting plug-in 31. The first pipeline 100 and the second pipeline 200 extend into the connecting pipe 11 from both ends of the connecting pipe 11, and the first pipeline 100 and the second pipeline 200 are arranged at intervals along the axial direction of the connecting pipe 11. The connecting pipe 11 is insulated from the first pipeline 100 and the second pipeline 200. The connecting pipe 11 Limiting connectors 31 are provided at both ends of the connecting pipe 11, and the limiting connectors 31 are used to fix the first pipeline 100 and the second pipeline 200 in the connecting pipe 11, so as to realize the connection between the first pipeline 100 and the second pipeline 200. When the first pipeline 100 and the second pipeline 200 are made of heterogeneous metal materials, since the connecting pipe 11 is insulated from the first pipeline 100 and the second pipeline 200, electrochemical corrosion will not occur between the first pipeline 100 and the second pipeline 200 made of heterogeneous materials.

[0051] Specifically, the first pipeline 100 includes a first pipe body 101 and a first flange 102 connected to the end of the first pipe body 101, and the second pipeline 200 includes a second pipe body 201 and a second flange 202 connected to the end of the second pipe body 201. The first flange 102 and the second flange 202 extend into the connecting pipe fitting 11 from both ends of the connecting pipe fitting 11, and are fixed in the connecting pipe fitting 11 through a limiting plug-in component 31. The first flange 102 and the second flange 202 are arranged at intervals along the axial direction of the connecting pipe fitting 11, and the connecting pipe fitting 11 and the first flange 102 and the second flange 202 are insulated. The limiting plug-in component 31 can be detachably inserted in the connecting pipe fitting 11 to fix the first flange 102 and the second flange 202 in the connecting pipe fitting 11. When the first pipeline 100 and the second pipeline 200 are made of heterogeneous metal materials, due to the insulation between the connecting pipe 11 and the first flange 102 and the second flange 202, electrochemical corrosion will not occur between the first pipeline 100 and the second pipeline 200 made of heterogeneous materials; and the detachable setting of the limiting connector 31 facilitates the disassembly and assembly of the limiting connector 31 and the first flange 102 and the second flange 202.

[0052] Optionally, the first pipeline 100 and the second pipeline 200 are heterogeneous metal pipelines, the connecting pipe 11 is a non-metallic pipe, the first flange 102 is made of the same material as the first pipe body 101, the second flange 202 is made of the same material as the second pipe body 201, and the first pipeline 100 and the second pipeline 200 can be connected by the connecting pipe 11, thereby avoiding electrochemical corrosion between the first pipeline 100 and the second pipeline 200. In this embodiment, the first pipe body 101 is a copper pipe, the first flange 102 is a copper flange, the first flange 102 is welded to one end of the first pipe body 101, the second pipe body 201 is a stainless steel pipe, the second flange 202 is a stainless steel flange, the second flange 202 is welded to one end of the second pipe body 201, and the connecting pipe 11 is a plastic pipe, and the connecting pipe 11 avoids electrochemical corrosion between the first pipeline 100 and the second pipeline 200. In other embodiments, the material of the first pipeline 100 and the second pipeline 200 is not limited to the above materials, and may be other heterogeneous metal materials, but the material of the first flange 102 is the same as the material of the first tube body 101, and the material of the second flange 202 is the same as the material of the second tube body 201, and the material of the connecting pipe 11 is not limited to plastic, as long as it can be insulated from the first flange 102 and the second flange 202.

[0053] Furthermore, the anti-corrosion connection structure can be adapted to pipelines of different sizes and is easy to disassemble and assemble. Since the first pipe body 101 has different inner diameter dimensions, such as 12.7 mm, 14 mm, and 16 mm, etc., it can be matched with first flanges 102 of different inner diameters, but the outer diameter of the first flange 102 remains unchanged to match the connecting pipe 11. The second pipe body 201 also has different inner diameter dimensions, such as 12 mm, 12.7 mm, and 14 mm, and can be matched with second flanges 202 of different inner diameters, but the outer diameter of the second flange 202 remains unchanged to match the connecting pipe 11.

[0054] In order to achieve a sealed connection between the first flange 102, the second flange 202 and the connecting pipe 11, as shown in FIG. Figure 2 and Figure 4 As shown, the first flange 102 and the second flange 202 are both provided with a receiving groove 24 in the circumference, and a sealing ring 41 is placed in the receiving groove 24. The sealing ring 41 is used to seal the gap between the first flange 102 or the second flange 202 and the connecting pipe 11 to prevent leakage.

[0055] Preferably, at least two receiving grooves 24 are arranged on the circumference of the first flange 102 and the second flange 202, and each receiving groove 24 is arranged at intervals along the axial direction of the first flange 102 or the second flange 202. The above arrangement increases the number of sealing rings 41, which can achieve a better sealing effect. In this embodiment, two receiving grooves 24 are arranged on the circumference of the first flange 102 and the second flange 202, and a sealing ring 41 is arranged in each receiving groove 24. The first flange 102 or the second flange 202 is sealed with the connecting pipe 11 through two sealing rings 41, and the sealing effect is better. In other embodiments, the receiving grooves 24 arranged on the circumference of the first flange 102 and the second flange 202 and the installed sealing rings 41 are not limited to two, and can also be three, four or more.

[0056] like Figure 5 and Figure 6 As shown, both ends of the connecting pipe 11 are respectively provided with a plug hole group 111 penetrating through the opposite side walls of the connecting pipe 11, and the first flange 102 and the second flange 202 are both provided with a limiting groove 23 arranged opposite to the plug hole group 111 in the circumferential direction, and the limiting plug connector 31 is penetrated through the corresponding plug hole group 111 and the limiting groove 23 to fix the first flange 102 or the second flange 202 in the connecting pipe 11. The limiting plug connector 31 is inserted into the corresponding plug hole group 111 and the limiting groove 23 to fix the first flange 102 or the second flange 202, and the removal of the limiting plug connector 31, the first flange 102 or the second flange 202 is facilitated.

[0057] In this embodiment, two groups of plug holes 111 are provided at each end of the connecting pipe 11, and a group of limiting plug connectors 31 are plugged into the two groups of plug holes 111 at each end of the connecting pipe 11. Each group of limiting plug connectors 31 is plugged into the two groups of plug holes 111, which can make the first flange 102 or the second flange 202 more securely fixed.

[0058] Furthermore, if Figure 2 As shown, the limiting plug-in connector 31 includes two plug-ins 311 arranged at intervals and a connecting portion 312 connecting the two plug-ins 311. The two plug-ins 311 are respectively inserted into the two groups of plug-in hole groups 111 at the same end of the connecting pipe 11, and the two plug-ins 311 pass through the limiting grooves 23 on both sides of the first flange 102 or the second flange 202 respectively, and the connecting portion 312 is located outside the connecting pipe 11. The two plug-ins 311 of the limiting plug-in connector 31 are inserted into the two groups of plug-in hole groups 111 at the same end of the connecting pipe 11, and the two plug-ins 311 pass through the limiting grooves 23 on both sides of the first flange 102 or the second flange 202 respectively, so that the first flange 102 or the second flange 202 is fixed more firmly to prevent the first flange 102 or the second flange 202 from shaking in the connecting pipe 11; the limiting plug-in connector 31 has a simple structure and is easy to prepare.

[0059] Preferably, the two plug-ins 311 and the connecting portion 312 are an integral structure, and the three are connected to form a U-shaped structure. In this embodiment, the plug-in 311 and the connecting portion 312 are both rod-shaped structures, which are bent to form a U-shaped structure. The structure of the limiting connector 31 is simple and easy to prepare.

[0060] Alternatively, if Figure 5 As shown, an anti-slip piece 12 is provided on the outer wall of the connecting pipe 11, and the connecting portion 312 is clamped on the anti-slip piece 12. The setting of the anti-slip piece 12 can prevent the limiting plug-in component 31 from arbitrarily falling out of the limiting plug-in hole group 111, thereby avoiding the failure of fixing the first flange 102 or the second flange 202. In this embodiment, an anti-slip piece 12 is provided at both ends of the connecting pipe 11, and the connecting portion 312 of each group of limiting plug-in components 31 is correspondingly clamped on a group of anti-slip pieces 12. Each limiting plug-in component 31 is fixed by a group of anti-slip pieces 12 to prevent it from falling out, thereby limiting the arbitrary falling out of each group of limiting plug-in components 31.

[0061] Specifically, Figure 5 As shown, the anti-slip part 12 includes a stopper 121 and an anti-slip part 122. One end of the stopper 121 is connected to the side wall of the connecting pipe 11, and the position-limiting connector 31 is located at one side of the stopper 121. The anti-slip part 122 is arranged at the other end of the stopper 121 and protrudes from the stopper 121. In this embodiment, the anti-slip part 122 is a hook structure, and the connecting part 312 abuts against the hook structure, thereby fixing the position-limiting connector 31. The anti-slip part 122 of the anti-slip part 12 abuts against the connecting part 312, thereby preventing the position-limiting connector 31 from arbitrarily falling out of the plug hole group 111. The stopper 121 is arranged at one side of the position-limiting connector 31, which can play a certain stopping role on the position-limiting connector 31, and prevent the position-limiting connector 31 from being deformed due to the snap-fitting of the connecting part 312 and the anti-slip part 122.

[0062] Alternatively, if Figure 7 and Figure 8 As shown, limiting steps 112 are respectively provided at both ends of the connecting pipe 11, and a gap is provided between the two limiting steps 112 along the axial direction of the connecting pipe 11. The first flange 102 and the second flange 202 are respectively extended into the corresponding limiting steps 112 and abut against the limiting steps 112. The limiting steps 112 can limit the insertion depth of the first flange 102 or the second flange 202, so that there is a gap between the first flange 102 and the second flange 202, and can also avoid electrochemical corrosion when the first flange 102 and the second flange 202 are made of different metal materials and come into contact with each other.

[0063] In order to ensure the connection strength, the gap size between the two limiting steps 112 is 5mm-20mm, and the first flange 102 is isolated from the second flange 202 without affecting the water flow, so as to prevent electrochemical corrosion caused by the potential difference.

[0064] Take the connection between copper pipe and stainless steel pipe as an example:

[0065] First, the copper pipe body and the copper flange are connected by welding, and then the sealing ring 41 is put into the receiving groove 24 of the copper flange to form a copper pipeline component.

[0066] Afterwards, the stainless steel pipe body is connected to the stainless steel flange by welding, and then a sealing ring 41 is put into the receiving groove 24 of the stainless steel flange to form a stainless steel pipeline component.

[0067] Afterwards, the copper pipe components and the stainless steel pipe components are inserted into the connecting pipe 11, the limiting connector 31 is inserted into the corresponding plug hole group 111 on the connecting pipe 11, and the limiting connector 31 is clamped on the anti-dropping component 12, thereby realizing the connection between the copper pipe and the stainless steel pipe.

[0068] It should be noted that: there is no limit to the order of connecting the copper pipe components and the stainless steel pipe components. The stainless steel pipe and the stainless steel flange can be welded first, and then the copper pipe and the copper flange can be connected.

[0069] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Anti-corrosion connection structure, characterized in that: Used to connect a first pipeline (100) and a second pipeline (200), the anti-corrosion connection structure comprises: A connecting pipe (11), wherein the first pipeline (100) and the second pipeline (200) extend into the connecting pipe (11) from two ends of the connecting pipe (11), respectively, and the first pipeline (100) and the second pipeline (200) are arranged at intervals along the axial direction of the connecting pipe (11), and the connecting pipe (11) is insulated from the first pipeline (100) and the second pipeline (200); A limiting plug connector (31), wherein both ends of the connecting pipe (11) are provided with the limiting plug connector (31), and the limiting plug connector (31) is used to fix the first pipeline (100) and the second pipeline (200) in the connecting pipe (11).

2. The anti-corrosion connection structure according to claim 1, characterized in that: The first pipeline (100) comprises a first pipe body (101) and a first flange (102) connected to the end of the first pipe body (101); the second pipeline (200) comprises a second pipe body (201) and a second flange (202) connected to the end of the second pipe body (201); the first flange (102) and the second flange (202) extend from two ends of the connecting pipe (11) into the connecting pipe (11) respectively, and are fixed in the connecting pipe (11) by means of the limiting plug-in connector (31); the first flange (102) and the second flange (202) are spaced apart along the axial direction of the connecting pipe (11); and the connecting pipe (11) is insulated from the first flange (102) and the second flange (202).

3. The anti-corrosion connection structure according to claim 2, characterized in that: Both ends of the connecting pipe (11) are respectively provided with a plug hole group (111) penetrating through the opposite side walls of the connecting pipe (11); the first flange (102) and the second flange (202) are both circumferentially provided with a limiting groove (23) arranged opposite to the plug hole group (111); the limiting plug connector (31) is passed through the correspondingly arranged plug hole group (111) and the limiting groove (23) to fix the first flange (102) or the second flange (202) in the connecting pipe (11).

4. The anti-corrosion connection structure according to claim 3, characterized in that: Two groups of plug-in hole groups (111) are provided at each end of the connecting pipe (11), and the two groups of plug-in hole groups (111) at each end of the connecting pipe (11) are plugged with a group of the limiting plug-in connector (31).

5. The anti-corrosion connection structure according to claim 4, characterized in that: The limiting plug-in connector (31) comprises two plug-ins (311) arranged at intervals and a connecting portion (312) connecting the two plug-ins (311); the two plug-ins (311) are respectively plugged into two groups of plug hole groups (111) at the same end of the connecting pipe (11); and the two plug-ins (311) respectively pass through the limiting grooves (23) on both sides of the first flange (102) or the second flange (202); and the connecting portion (312) is located outside the connecting pipe (11).

6. The anti-corrosion connection structure according to claim 5, characterized in that: An anti-dropout piece (12) is provided on the outer wall of the connecting pipe (11), and the connecting portion (312) is clamped on the anti-dropout piece (12).

7. The anti-corrosion connection structure according to claim 6, characterized in that: An anti-dropout piece (12) is provided at each end of the connecting pipe (11), and the connecting portion (312) of each group of the position-limiting plug connectors (31) is correspondingly snap-connected to a group of the anti-dropout pieces (12).

8. The anti-corrosion connection structure according to claim 6, characterized in that: The anti-dropping member (12) comprises: a stopper (121), one end of the stopper (121) being connected to a side wall of the connecting pipe (11), and the limiting plug connector (31) being located on one side of the stopper (121); An anti-slip portion (122), the anti-slip portion (122) being arranged at the other end of the stop portion (121) and protruding from the stop portion (121), and the connecting portion (312) being in abutment with the anti-slip portion (122).

9. The anti-corrosion connection structure according to any one of claims 2 to 8, characterized in that: Limiting steps (112) are respectively provided at both ends of the connecting pipe (11), a gap is provided between the two limiting steps (112) along the axial direction of the connecting pipe (11), and the first flange (102) and the second flange (202) respectively extend into the corresponding limiting steps (112) and abut against the limiting steps (112).

10. The anti-corrosion connection structure according to any one of claims 2 to 8, characterized in that: The first flange (102) and the second flange (202) are both provided with a receiving groove (24) in the circumference, and a sealing ring (41) is accommodated in the receiving groove (24).

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