A glass fiber reinforced plastic pipe connection sealing structure

Abstract

The present invention belongs to the technical field of glass fiber reinforced plastic pipeline assembly, and specifically relates to a glass fiber reinforced plastic pipeline connection sealing structure, comprising a pipe body a, a pipe body b and a connecting sleeve installed on one side of a flange of the pipe body b, wherein the flange end of the pipe body a is slidably inserted into a port of the connecting sleeve away from the flange; a sealing component is arranged between the inner wall of the port of the connecting sleeve away from the flange and the outer wall of the flange end of the pipe body a; a stabilizing sleeve and an interlayer sleeve are arranged on the outer wall of the pipe body a and the outer wall of the pipe body b, respectively, and a tension spring is arranged between two corresponding mounting ears; an annular clamping plate is also arranged on the inner bottom wall of the stabilizing sleeve, and a disc spring and a sealing gasket are clamped in the annular clamping plate; the structure is used to solve the problem that the current glass fiber reinforced plastic pipelines are connected by a rigid connection, so that when the pipelines undergo thermal expansion and contraction effects, the pipelines cannot achieve a certain degree of expansion and contraction, resulting in the connection being easily damaged and leaking.

Description

Technical Field

[0001] The invention belongs to the technical field of glass fiber reinforced plastic pipeline assembly, and in particular relates to a glass fiber reinforced plastic pipeline connection sealing structure. Background Art

[0002] FRP pipe is a lightweight, high-strength, corrosion-resistant non-metallic pipe. The glass fiber with a resin matrix is ​​wound layer by layer on a rotating mandrel according to the process requirements, and quartz sand is evenly spread between the fibers at a long distance as a sand layer. The pipe wall structure is reasonable and advanced, which can give full play to the role of the material. Under the premise of meeting the use strength, the rigidity is improved to ensure the stability and reliability of the product.

[0003] Nowadays, many connections between FRP pipes are made by welding or flange connection. However, welding will cause a certain degree of damage to the pipe matrix at the pipe mouth, making the strength of the connection part relatively weak, resulting in the welding part easily breaking and leaking when the pipe body undergoes thermal expansion and contraction effects. In addition, flange connection is used for rigid connection, so when the pipe body undergoes thermal expansion and contraction effects, the connecting bolts at the flange connection are easily pulled off, resulting in leakage in the pipe. Summary of the invention

[0004] Based on the problems mentioned in the above background technology, the present invention provides a FRP pipe connection sealing structure, which is used to solve the problem that the current FRP pipes are connected by rigid connection, so that when the pipes undergo thermal expansion and contraction effects, the pipes cannot achieve a certain degree of expansion and contraction, resulting in the connection being easily damaged and causing leakage.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A glass fiber reinforced plastic pipe connection sealing structure, comprising a pipe body a with a flange at one end, a pipe body b with a flange on the outer wall of the pipe, and a connecting sleeve installed on one side of the flange of the pipe body b, wherein the flange end of the pipe body a is slidably inserted into a port of the connecting sleeve away from the flange;

[0007] A sealing assembly for sealing the outer wall of the tube body a and the inner wall of the connecting sleeve is arranged between the inner wall of the port of the connecting sleeve away from the flange and the outer wall of the flange end of the tube body a; a stabilizing sleeve and an interlayer sleeve are arranged on the outer wall of the tube body a and the outer wall of the tube body b, respectively, and the stabilizing sleeve is slidably clamped in the interlayer of the interlayer sleeve toward one end of the interlayer sleeve, and three corresponding mounting ears are arranged on the circumferential sides of the ends of the stabilizing sleeve and the interlayer sleeve that are away from each other, and a tension spring is arranged between two corresponding mounting ears;

[0008] An annular clamping plate is also provided on the inner bottom wall of the stabilizing sleeve, and a disc spring and a sealing gasket are clamped in the annular clamping plate. The disc spring is located between the sealing gasket and the inner bottom wall of the stabilizing sleeve, and the disc spring and the sealing gasket are tightly sleeved on the outer wall of the tube body a; one end of the sealing gasket is in close contact with the end portion of the connecting sleeve away from the flange under the action of the disc spring;

[0009] The sealing assembly comprises a mounting snap ring a and a mounting snap ring b which are arranged opposite to each other in openings. The mounting snap ring a is sleeved in a port of the connecting sleeve away from the flange and is locked by a locking member. The mounting snap ring b is sleeved on the tube body a and is located on the back side of the flange of the tube body a. An elastic member and an annular ferrule are arranged in the openings opposite to the mounting snap ring a and the mounting snap ring b. Sealing pads are arranged at opposite ends of the two annular ferrules. The two sealing pads are in close contact with each other under the action of the corresponding elastic member.

[0010] The locking member comprises six positioning blocks which are arranged in an array on the circumferential outer wall of the mounting clamp ring a, and the inner wall of the port of the connecting sleeve away from the flange is provided with positioning grooves which match the six positioning blocks, and the six positioning blocks on the mounting clamp ring a are correspondingly clamped in the six positioning grooves; the circumferential outer wall of the connecting sleeve is also provided with fixing heads which correspond to the positions of the six positioning grooves, and each fixing head is provided with a screw, and the screw-in end of the screw penetrates into the positioning groove and is screwed into the positioning block;

[0011] A convex ring is also arranged on the outer wall of the tube body b, and the inner bottom wall of the interlayer sleeve abuts against the side wall of the convex ring.

[0012] On the basis of the above technical solution, the present invention also makes the following improvements:

[0013] Furthermore, the elastic member includes two annular gaskets, which are arranged at intervals on one side of the clamping end of the annular sleeve, and a plurality of pressure springs are arranged in an array between the two annular gaskets.

[0014] Furthermore, a sealing ring with an L-shaped cross-section is arranged in the port of the connecting sleeve close to the flange, and the lateral surface of the L-shaped sealing ring is tightly fitted between the outer wall of the tube body b and the inner wall of the connecting sleeve, and the vertical surface is tightly fitted between the end side wall of the connecting sleeve close to the flange and the side wall of the flange of the tube body b.

[0015] Furthermore, the outer diameter of the sealing gasket is larger than the outer diameter of the end of the connecting sleeve away from the flange.

[0016] Furthermore, the tensile force of the tension spring is greater than the elastic force of the disc spring.

[0017] Beneficial effects of the present invention:

[0018] 1. The connecting sleeve is installed on the side of the flange of the pipe body b so as to be assembled on the pipe body b. The flange end of the pipe body a is slidably inserted into the port of the connecting sleeve away from the flange, so that the insertion end of the pipe body a is movably sleeved in the connecting sleeve. When the pipe bodies a and b produce thermal expansion and contraction effects, the pipe body a can move to a certain extent inside the port of the connecting sleeve away from the flange, thereby avoiding the phenomenon that the connection between the pipe bodies a and b is rigidly connected and the connection is damaged when affected by thermal expansion and contraction, causing leakage of the pipeline;

[0019] 2. A sealing component for sealing the outer wall of the tube body a and the inner wall of the connecting sleeve is arranged between the inner wall of the port of the connecting sleeve away from the flange and the outer wall of the flange end of the tube body a. The arranged sealing component can enhance the sealing performance of the contact between the outer wall of the tube body a and the inner wall of the connecting sleeve to avoid leakage caused by gaps therebetween;

[0020] 3. By sliding one end of the stabilizing sleeve installed on the outer wall of the tube body a into the interlayer of the interlayer sleeve, the stabilizing sleeve is movably assembled on the interlayer sleeve, which can play a certain auxiliary supporting role for the tube body a. After one end of the tube body a is inserted into the connecting sleeve, the weight of the inserted end of the tube body a is shared by the connecting sleeve and the stabilizing sleeve, which can effectively reduce the pressing force of the tube body a on the connecting sleeve; and through the set tension spring, the tension spring can pull the stabilizing sleeve, so that the stabilizing sleeve keeps the trend of approaching the interlayer sleeve, which can limit the movement of the tube body a after it is inserted into the connecting sleeve, and prevent the inserted end of the tube body a from completely moving out of the connecting sleeve;

[0021] 4. An annular clamping plate is arranged on the inner bottom wall of the stabilizing sleeve, and a disc spring and a sealing gasket are clamped in the annular clamping plate. The disc spring can push the sealing gasket, so that when the pipe body a moves in the connecting sleeve due to thermal expansion and contraction of the pipeline, the disc spring can always keep pushing the sealing gasket, so that one end of the sealing gasket is in close contact with the end of the connecting sleeve away from the flange, thereby ensuring that its sealing performance will not be affected when the pipeline expands and contracts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0023] Figure 1 A three-dimensional diagram of a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0024] Figure 2 An exploded view of a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0025] Figure 3 An exploded view of some components in a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0026] Figure 4 It is an assembly cross-sectional view of a pipe body a and a connecting sleeve in a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0027] Figure 5 It is an assembly cross-sectional view of a pipe body a, a pipe body b and a connecting sleeve in a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0028] Figure 6 It is a three-dimensional cross-sectional view of some components in a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0029] Figure 7 It is a planar cross-sectional view of some components in a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0030] Figure 8 A three-dimensional cross-sectional view of a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0031] Fig. 9 A plan cross-sectional view of a glass fiber reinforced plastic pipe connection sealing structure of the present invention;

[0032] Fig.10 for Figure 4 A magnified image of area A;

[0033] Fig.11 for Figure 4 Magnified view of area B.

[0034] The main component symbols are described as follows:

[0035] 1. Tube body a; 2. Tube body b; 3. Connecting sleeve; 4. Stabilizing sleeve; 5. Interlayer sleeve; 6. Mounting lug; 8. Tension spring; 9. Sealing ring; 10. Mounting snap ring a; 11. Mounting snap ring b; 12. Positioning groove; 15. Annular gasket; 16. Annular clamping sleeve; 17. Sealing pad; 18. Positioning block; 19. Pressure spring; 20. Annular clamping plate; 21. Disc spring; 22. Sealing gasket; 23. Convex ring; 24. Fixed head. DETAILED DESCRIPTION

[0036] like Figures 1 to 11 As shown, a glass fiber reinforced plastic pipe connection sealing structure comprises a pipe body a1 with a flange at one end, a pipe body b2 with a flange on the outer wall of the pipe, and a connecting sleeve 3 installed on one side of the flange of the pipe body b2. By installing the connecting sleeve 3 on one side of the flange of the pipe body b2, the connecting sleeve 3 is assembled on the pipe body b2, and one end of the pipe body b2 is clamped in the port of the connecting sleeve 3 close to the flange, which can effectively increase the connection strength between the connecting sleeve 3 and the pipe body b2.

[0037] See also Figure 5A sealing ring 9 with an L-shaped cross section is arranged in the port of the connecting sleeve 3 close to the flange. The transverse surface of the L-shaped sealing ring 9 is tightly fitted between the outer wall of the tube body b2 and the inner wall of the connecting sleeve 3, and the vertical surface is tightly fitted between the side wall of the end of the connecting sleeve 3 close to the flange and the side wall of the flange of the tube body b2. By setting the cross section of the sealing ring 9 to be L-shaped, after the sealing ring 9 is cushioned in the port of the connecting sleeve 3 close to the flange, its transverse surface is tightly fitted between the outer wall of the tube body b2 and the inner wall of the connecting sleeve 3, which can effectively increase the sealing between the outer wall of the tube body b2 and the inner wall of the connecting sleeve 3; and the vertical surface of the sealing ring 9 is tightly fitted between the side wall of the end of the connecting sleeve 3 close to the flange and the side wall of the flange of the tube body b2, which can effectively increase the sealing between the side wall of the end of the connecting sleeve 3 close to the flange and the side wall of the flange of the tube body b2, and avoid gaps at the connection and leakage;

[0038] See also Figure 4 and Figure 5 The flange end of the pipe body a1 is slidably inserted into the port of the connecting sleeve 3 away from the flange, so that the flange end of the pipe body a1 is movably sleeved in the connecting sleeve 3, so that when the pipe body a1 and the pipe body b2 produce thermal expansion and contraction effects, the flange end of the pipe body a1 can move to a certain extent inside the port of the connecting sleeve 3 away from the flange, thereby avoiding the phenomenon that the pipe body a1 and the pipe body b2 are rigidly connected, so that when the pipeline is affected by thermal expansion and contraction, the connection between the pipe body a1 and the pipe body b2 is damaged, resulting in leakage of the pipeline;

[0039] See also Figure 4 and Figure 5 A sealing component for sealing the outer wall of the tube body a1 and the inner wall of the connecting sleeve 3 is provided between the inner wall of the port of the connecting sleeve 3 away from the flange and the outer wall of the flange end of the tube body a1. By providing the sealing component, the sealing performance of the contact between the outer wall of the tube body a1 and the inner wall of the connecting sleeve 3 can be increased to avoid the problem of leakage caused by the gap between them;

[0040] See also Figure 3 , Figure 4 , Figure 5 , Fig.10 and Fig.11The sealing assembly includes an installation snap ring a10 and an installation snap ring b11 with openings facing each other, wherein the installation snap ring a10 is sleeved in the port of the connecting sleeve 3 away from the flange and is locked by a locking member, so that the installation snap ring a10 is stably installed in the port of the connecting sleeve 3 away from the flange; specifically, the locking member includes six positioning blocks 18 distributed in an array on the outer wall of the circumference of the installation snap ring a10, and the inner wall of the port of the connecting sleeve 3 away from the flange is correspondingly provided with positioning grooves 12 matching the six positioning blocks 18. During assembly, the six positioning blocks 18 on the installation snap ring a10 are respectively aligned with the six positioning grooves 12 provided on the inner wall of the connecting sleeve 3, and then the installation snap ring a10 is pushed, so that the six positioning blocks 18 on the installation snap ring a10 are respectively moved into the six positioning grooves 12 clamped on the inner wall of the connecting sleeve 3, thereby realizing preliminary positioning of the installation snap ring a10 and preventing the installation snap ring a10 from rotating in the connecting sleeve 3;

[0041] A fixing head 24 corresponding to the position of the six positioning grooves 12 is also provided on the circumferential outer wall of the connecting sleeve 3, and a screw is provided on each fixing head 24, and the screw-in end of the screw penetrates into the positioning groove 12 and is screwed into the positioning block 18. When the six positioning blocks 18 on the mounting clamp a10 are respectively inserted into the six positioning grooves 12 on the inner wall of the connecting sleeve 3, the screws in the screw holes on the corresponding fixing heads 24 can be screwed into the positioning grooves 12 respectively, so that the screw-in end of the screw is screwed into the corresponding positioning block 18, and the positioning block 18 can be fixed in the positioning groove 12, thereby fixing the mounting clamp a10, so that the mounting clamp a10 is firmly installed in the port of the connecting sleeve 3 away from the flange.

[0042] See also Figures 2 to 5 , the mounting clamp b11 is sleeved on the tube body a1 and is located on the back side of the flange of the tube body a1, so that the mounting clamp b11 is stably mounted on the back side of the flange of the tube body a1;

[0043] An elastic member and an annular clamping sleeve 16 are disposed in the openings opposite to the mounting clamping ring a10 and the mounting clamping ring b11. The elastic member is used to push against the corresponding annular clamping sleeve 16, so that the corresponding annular clamping sleeve 16 can move in the mounting clamping ring a10 and the mounting clamping ring b11.

[0044] See also Figure 4 , Figure 5 , Fig.10 and Fig.11The elastic member includes two annular gaskets 15, and the two annular gaskets 15 are spaced apart on one side of the snap-in end of the annular sleeve 16. The two annular gaskets 15 in the elastic member located in the opening of the mounting snap ring a10 are spaced apart between the corresponding annular sleeve 16 and the bottom of the opening groove of the mounting snap ring a10, and a plurality of pressing springs 19 are arranged in an array between the two annular gaskets 15 for pressing the annular gasket 15 in contact with the annular sleeve 16, so that the annular gasket 15 can press the annular sleeve 16 while moving, so that the group of annular sleeves 16 can move in the mounting snap ring a10;

[0045] The two annular gaskets 15 in the elastic member located in the opening of the mounting snap ring b11 are spaced apart between the corresponding annular sleeves 16 and the bottom of the opening groove of the mounting snap ring b11, and a plurality of pressing springs 19 are also arranged in an array between the two annular gaskets 15, so that the annular gaskets 15 in contact with the annular sleeves 16 can be pressed by the arranged pressing springs 19, so that the annular gaskets 15 move to press the annular sleeves 16, so that the group of annular sleeves 16 can move in the mounting snap ring b11;

[0046] The two opposite ends of the two annular ferrules 16 are provided with sealing gaskets 17, and the two sealing gaskets 17 are in close contact with each other under the action of the corresponding elastic members. When the pipe is affected by thermal expansion and contraction, so that the pipe body a1 moves slightly toward the pipe body b2, the pressing spring 19 located in the mounting clamp ring a10 can push the annular ferrule 16 located in the mounting clamp ring a10, and make it move toward the pipe body b2, so that the sealing gasket 17 on the side wall of the annular ferrule 16 in the mounting clamp ring a10 can always keep in close contact with the sealing gasket 17 on the side wall of the annular ferrule 16 in the mounting clamp ring b11;

[0047] When the tube a1 moves slightly away from the tube b2, the mounting clamping ring b11 on the back side of the flange of the tube a1 squeezes the pressing spring 19, and while squeezing the pressing spring 19, it can also indirectly squeeze the annular sleeve 16 in the mounting clamping ring b11, so that the sealing gasket 17 on the side wall of the annular sleeve 16 in the mounting clamping ring b11 is in close contact with the sealing gasket 17 on the side wall of the annular sleeve 16 in the mounting clamping ring a10, and finally when the tube a1 moves slightly in the connecting sleeve 3, the sealing of the contact between the outer wall of the tube a1 and the inner wall of the connecting sleeve 3 can be ensured, so as to avoid the formation of a gap therebetween and leakage;

[0048] See also Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9, a stabilizing sleeve 4 and an interlayer sleeve 5 are respectively arranged on the outer wall of the tube body a1 and the outer wall of the tube body b2, and the stabilizing sleeve 4 is slidably clamped in the interlayer of the interlayer sleeve 5 toward one end of the interlayer sleeve 5. By sliding one end of the stabilizing sleeve 4 installed on the outer wall of the tube body a1 into the interlayer of the interlayer sleeve 5, the stabilizing sleeve 4 is movably assembled on the interlayer sleeve 5, so as to play a certain auxiliary supporting role for the tube body a1, and after the flange end of the tube body a1 is slidably inserted into the connecting sleeve 3, the weight of the flange end of the tube body a1 is jointly borne by the connecting sleeve 3 and the stabilizing sleeve 4, which can effectively reduce the pressing force of the tube body a1 on the connecting sleeve 3;

[0049] Three corresponding mounting ears 6 are arranged around the ends of the stabilizing sleeve 4 and the interlayer sleeve 5, and a tension spring 8 is arranged between two corresponding mounting ears 6. The tension spring 8 can pull the stabilizing sleeve 4 so that the stabilizing sleeve 4 keeps approaching the interlayer sleeve 5, and can limit the movement of the tube body a1 after the tube body a1 is inserted into the connecting sleeve 3, so as to prevent the flange end of the tube body a1 from completely moving out of the connecting sleeve 3.

[0050] See also Figures 6 to 9 , an annular clamping plate 20 is also provided on the inner bottom wall of the stabilizing sleeve 4, and a disc spring 21 and a sealing gasket 22 are clamped in the annular clamping plate 20, the disc spring 21 is located between the sealing gasket 22 and the inner bottom wall of the stabilizing sleeve 4, and the disc spring 21 and the sealing gasket 22 are tightly sleeved on the outer wall of the tube body a1; one end of the sealing gasket 22 is in close contact with the end portion of the connecting sleeve 3 away from the flange under the action of the disc spring 21, when the pipeline is affected by thermal expansion and contraction, so that the tube body a1 moves slightly toward the direction close to the tube body b2, the stabilizing sleeve 4 can be driven to move toward the sandwich sleeve 5 to cause the tension spring 8 to compress, and while the stabilizing sleeve 4 moves toward the sandwich sleeve 5, the inner bottom wall of the stabilizing sleeve 4 can press the disc spring 21, so that the disc spring 21 presses the sealing gasket 22, so that the side wall of the sealing gasket 22 is in close contact with the end portion of the connecting sleeve 3 away from the flange;

[0051] When the tube body a1 moves slightly in the direction away from the tube body b2, it can drive the stabilizing sleeve 4 to move away from the interlayer sleeve 5, causing the tension spring 8 to stretch. When the stabilizing sleeve 4 moves in the direction away from the interlayer sleeve 5, the disc spring 21 is elastic, so that the elastic force of the disc spring 21 can be used to push the sealing gasket 22, so that the sealing gasket 22 is always in close contact with the end portion of the connecting sleeve 3 away from the flange, thereby ensuring that no matter in which axial direction the tube body a1 moves slightly, the sealing gasket 22 can be in close contact with the end portion of the connecting sleeve 3 away from the flange, and the sealing failure will not occur.

[0052] See also Figure 7A convex ring 23 is also provided on the outer wall of the tube body b2, and the inner bottom wall of the interlayer sleeve 5 abuts against the side wall of the convex ring 23. The convex ring 23 can abut against the inner bottom wall edge of the interlayer sleeve 5, thereby stabilizing the interlayer sleeve 5.

[0053] See also Figure 7 The outer diameter of the sealing gasket 22 is larger than the outer diameter of the end of the connecting sleeve 3 away from the flange. Setting the outer diameter of the sealing gasket 22 to be larger than the outer diameter of the end of the connecting sleeve 3 away from the flange can increase the contact area between the sealing gasket 22 and the end of the connecting sleeve 3, thereby preventing the end of the connecting sleeve 3 from expanding and becoming unable to be completely sealed by the sealing gasket 22 when the connecting sleeve 3 undergoes thermal expansion.

[0054] See also Figure 7 The tensile force of the stretch spring 8 is greater than the elastic force of the disc spring 21, which makes the elastic force of the disc spring 21 smaller than the tensile force of the stretch spring 8. This can avoid the situation where the elastic force of the disc spring 21 is greater than the elastic force of the stretch spring 8, and the stabilizing sleeve 4 is pushed in the reverse direction to move away from the interlayer sleeve 5.

[0055] The present invention has been described in detail above. The description of the specific embodiments is only used to help understand the method of the present invention and its core concept. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A glass fiber reinforced plastic pipe connection sealing structure, characterized in that: It comprises a tube body a (1) with a flange at one end, a tube body b (2) with a flange on the outer wall of the tube, and a connecting sleeve (3) installed on one side of the flange of the tube body b (2), wherein the flange end of the tube body a (1) is slidably inserted into a port of the connecting sleeve (3) away from the flange; A sealing assembly for sealing the outer wall of the tube body a (1) and the inner wall of the connecting sleeve (3) is arranged between the inner wall of the port of the connecting sleeve (3) away from the flange and the outer wall of the flange end of the tube body a (1); a stabilizing sleeve (4) and an interlayer sleeve (5) are arranged on the outer wall of the tube body a (1) and the outer wall of the tube body b (2) in opposite positions, respectively; the stabilizing sleeve (4) is slidably mounted in the interlayer of the interlayer sleeve (5) toward one end of the interlayer sleeve (5); three mounting ears (6) in corresponding positions are arranged on the circumferential sides of the ends of the stabilizing sleeve (4) and the interlayer sleeve (5) facing away from each other, and a tension spring (8) is arranged between two mounting ears (6) in corresponding positions; An annular clamping plate (20) is also provided on the inner bottom wall of the stabilizing sleeve (4), and a disc spring (21) and a sealing gasket (22) are clamped inside the annular clamping plate (20). The disc spring (21) is located between the sealing gasket (22) and the inner bottom wall of the stabilizing sleeve (4), and the disc spring (21) and the sealing gasket (22) are tightly sleeved on the outer wall of the tube body a (1); one end of the sealing gasket (22) is in close contact with the end portion of the connecting sleeve (3) away from the flange under the action of the disc spring (21); The sealing assembly comprises a mounting snap ring a (10) and a mounting snap ring b (11) which are arranged with openings facing each other, the mounting snap ring a (10) being sleeved in a port of the connecting sleeve (3) away from the flange and being locked by a locking member, and the mounting snap ring b (11) being sleeved on the tube body a (1) and being located on the back side of the flange of the tube body a (1); elastic members and annular clamping sleeves (16) are arranged in the openings facing each other of the mounting snap ring a (10) and the mounting snap ring b (11), and sealing pads (17) are arranged at opposite ends of the two annular clamping sleeves (16), and the two sealing pads (17) are in close contact with each other under the action of the corresponding elastic members; The locking member comprises six positioning blocks (18) arranged in an array on the circumferential outer wall of the mounting snap ring a (10); the inner wall of the port of the connecting sleeve (3) away from the flange is provided with positioning grooves (12) matching the six positioning blocks (18); the six positioning blocks (18) on the mounting snap ring a (10) are correspondingly clamped in the six positioning grooves (12); the circumferential outer wall of the connecting sleeve (3) is also provided with fixing heads (24) corresponding to the positions of the six positioning grooves (12); each fixing head (24) is provided with a screw, the screw-in end of the screw passes through the positioning groove (12) and is screwed into the positioning block (18); A convex ring (23) is also provided on the outer wall of the tube body b (2), and the inner bottom wall of the interlayer sleeve (5) abuts against the side wall of the convex ring (23).

2. A glass fiber reinforced plastic pipe connection sealing structure according to claim 1, characterized in that: The elastic member comprises two annular gaskets (15), the two annular gaskets (15) being arranged at intervals on one side of the clamping end of the annular clamping sleeve (16), and a plurality of pressure springs (19) being arranged in an array between the two annular gaskets (15).

3. The glass fiber reinforced plastic pipe connection sealing structure according to claim 1, characterized in that: A sealing ring (9) with an L-shaped cross section is arranged in the port of the connecting sleeve (3) close to the flange. The transverse surface of the L-shaped sealing ring (9) is tightly fitted between the outer wall of the tube body b (2) and the inner wall of the connecting sleeve (3), and the vertical surface is tightly fitted between the side wall of the end of the connecting sleeve (3) close to the flange and the side wall of the flange of the tube body b (2).

4. The glass fiber reinforced plastic pipe connection sealing structure according to claim 1, characterized in that: The outer diameter of the sealing gasket (22) is greater than the outer diameter of the end of the connecting sleeve (3) away from the flange.

5. The glass fiber reinforced plastic pipe connection sealing structure according to claim 1, characterized in that: The tensile force of the tensile spring (8) is greater than the elastic force of the disc spring (21).

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