Interpolation type electric melting rubber ring double-sealing joint for multi-pipe

Abstract

The utility model relates to the field of plastic pipe fittings, and discloses a multi-pipe internal insertion type electric melting rubber ring double-sealing joint which comprises a connecting pipe, a positioning piece, a first electric melting sleeve and a second electric melting sleeve are sequentially arranged on the periphery of the connecting pipe in the length direction of the connecting pipe, and the positioning piece and the first electric melting sleeve are positioned on the connecting pipe. The second electric melting sleeve can move in the length direction of the connecting pipe and is connected with the connecting pipe in a sealed mode, a first electric heating wire is arranged in the first electric melting sleeve, two first connecting columns are arranged at one end of the outer portion of the first electric melting sleeve and connected with the two ends of the first electric heating wire respectively, and a second electric heating wire is arranged in the second electric melting sleeve and connected with the two ends of the first electric heating wire respectively. Two second connecting columns are arranged at one end of the outer portion of a second electric melting sleeve and connected with the two ends of a second electric heating wire respectively, two multi-pipe bodies are connected, the connecting pipes are connected with one multi-pipe body through positioning pieces, and the second electric melting sleeve can be inserted into the other multi-pipe body only through a small number of workers or one worker. And convenience is provided for connection of multiple pipes.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic pipe fittings, in particular to an inner-insertion type electric fusion rubber ring double-sealing joint for multiple pipes. Background Art

[0002] Multi-reinforced steel-plastic composite pipe is a new type of pipe. It is based on the existing steel skeleton plastic composite pipe and steel belt reinforced plastic drainage pipe technology, and is developed using metal plastic composite molding, steel plastic composite structure design, and strip winding welding molding technologies. This type of pipe is an ideal choice for reducing project costs within the range of small and medium caliber, medium and low pressure room temperature buried water supply plastic pipes. Multiple pipes are commonly connected by clamps and electric fusion rubber rings. Both clamp connections and existing electric fusion rubber ring connections require the participation of multiple people, and connecting multiple pipes is more troublesome. Utility Model Content

[0003] The utility model aims to provide an inner-insertion type electric fusion rubber ring double-sealing joint for multiple pipes, which has the effect of facilitating the connection of multiple pipes.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] An internally inserted electric fusion rubber ring double-sealed joint for multiple pipes comprises a connecting pipe, wherein the outer circumference of the connecting pipe is provided with a positioning piece, an electric fusion sleeve 1 and an electric fusion sleeve 2 in sequence along its length direction, the positioning piece and the electric fusion sleeve 1 are positioned on the connecting pipe, the electric fusion sleeve 2 can move in the length direction of the connecting pipe and is sealed and connected to the connecting pipe, the electric fusion sleeve 1 is provided with an electric heating wire 1 inside, and two connecting columns 1 are provided at one end outside the electric fusion sleeve 1, and the two connecting columns 1 are respectively connected to the two ends of the electric heating wire 1, the electric fusion sleeve 2 is provided with an electric heating wire 2 inside, and two connecting columns 2 are provided at one end outside the electric fusion sleeve 2, and the two connecting columns 2 are respectively connected to the two ends of the electric heating wire 2.

[0006] By adopting the above technical solution, the connecting pipe is placed between two multi-tubes to be connected, and one end of the connecting pipe is inserted into one of the multi-tubes, so that the positioning piece on the connecting pipe and the electric fusion sleeve one are located in the multi-tube, and the two connecting posts one on the electric fusion sleeve one are located outside the multi-tube, so that the positioning piece is pressed against the inner wall of the multi-tube, and then the electric fusion sleeve two is moved on the connecting pipe until the electric fusion sleeve two extends into the other multi-tube and the two connecting posts two on the electric fusion sleeve two are located outside the multi-tube. Since the positioning piece has fixed the connecting pipe and one of the multi-tubes together, the electric fusion sleeve Inserting the fusion sleeve two into another multiple tube can be completed by a small number of people or even one person. After that, the positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns one, and the heating wire one is energized. The heating wire one heats up to melt the outer periphery of the electric fusion sleeve one and the inner wall of the corresponding multiple tube. After cooling, the two will be fused together. The positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns two, and the heating wire two is energized. The heating wire two heats up to melt the outer periphery of the electric fusion sleeve two and the inner wall of the corresponding multiple tube. After cooling, the two will be fused together. In this way, the connection of the two multiple tubes is realized, which is very convenient.

[0007] The utility model is further configured as follows: a convex ring is fixed on the connecting pipe, an inner wall of the electric fusion sleeve is fixedly connected to the outer periphery of the convex ring, a plurality of through holes penetrating the other side are opened on one side of the convex ring, and the plurality of through holes are evenly spaced around the circumference of the connecting pipe, the positioning member comprises a plurality of telescopic springs evenly spaced around the outer periphery of the connecting pipe, the telescopic springs extend radially along the connecting pipe, one end of the telescopic springs is fixed to the outer periphery of the connecting pipe, and a contact block is fixed to the other end of the telescopic spring, pressure rods extending along the length direction of the connecting pipe are penetrated through the plurality of through holes, the pressure rods are sealedly connected to the corresponding through holes, an annular handle is provided on one side of the convex ring, one end of the plurality of pressure rods are fixedly connected to the annular handle, and the side surfaces of the other ends of the plurality of pressure rods facing the outer periphery of the connecting pipe are respectively contacted with the corresponding abutment blocks.

[0008] By adopting the above technical solution, when connecting two multiple tubes, the electric fusion sleeve and the positioning piece on the connecting tube are placed into a multiple tube, and the staff grasps the annular handle by hand to move several pressure rods along the length direction of the connecting tube, so that the pressure rods are separated from the corresponding abutment blocks, and the several abutment blocks can be pressed against the inner wall of the multiple tube under the elastic force of the corresponding telescopic springs, so that the connecting tube is fixed on the multiple tube. The whole operation is very convenient and can be realized without a lot of manpower, which provides convenience for the connection of multiple tubes.

[0009] The utility model is further configured as follows: the outer periphery of the first electric fusion sleeve is provided with a protrusion one near the position at the end where the first connecting column is provided, the first electric fusion sleeve is provided with a sealing ring one, and the first protrusion one is located between the first connecting column and the first sealing ring; the outer periphery of the second electric fusion sleeve is provided with a protrusion two near the position at the end where the second connecting column is provided, the second electric fusion sleeve is provided with a sealing ring two, and the second protrusion two is located between the second connecting column and the second sealing ring.

[0010] By adopting the above technical solution, the provision of sealing ring 1 and sealing ring 2 improves the sealing performance of the joint connecting two multiple tubes.

[0011] The utility model is further configured as follows: the protrusion 1 and the protrusion 2 are both annular, the outer diameter of the protrusion 1 is the same as the outer diameter of the sealing ring 1, the outer diameter of the protrusion 2 is the same as the outer diameter of the sealing ring 2, the outer periphery of the protrusion 1 has a folded portion 1 extending in a direction away from the connecting column 1, and the outer periphery of the protrusion 2 has a folded portion 2 extending in a direction away from the connecting column 2.

[0012] By adopting the above technical solution, setting the folding part one can effectively protect the sealing ring one and the multiple tube ends abutting against the sealing ring one, and setting the folding part two can effectively protect the sealing ring two and the multiple tube ends abutting against the sealing ring two.

[0013] The utility model is further configured as follows: the outer periphery of the connecting tube has a plurality of cylinders extending radially along the connecting tube, each of the cylinders is provided with a telescopic spring, the height of the cylinder is less than the length of the telescopic spring, and there is a spacing between one end of each cylinder away from the connecting tube and the corresponding pressure rod.

[0014] By adopting the above technical solution, the cylinder body is arranged to ensure that the telescopic spring can be telescoped along its length direction, and the telescopic spring and the abutment block can cooperate to effectively fix the connecting pipe and the multi-tube, providing guarantee for the normal subsequent connection work.

[0015] The utility model is further configured as follows: an accordion protective cover is fixed to one end of each cylinder away from the connecting pipe, and the abutment block is located inside the accordion protective cover.

[0016] By adopting the above technical solution, the cylinder body cooperates with the corresponding accordion protective cover to prevent the telescopic spring and the abutment block in the cylinder body from being exposed in the multiple tubes, so that when there is flowing liquid in the multiple tubes, they will not come into contact with the liquid, thereby preventing the telescopic spring from being corroded, and preventing the telescopic spring and the abutment block from being washed away by the flowing liquid and contaminating the flowing liquid.

[0017] The utility model is further configured as follows: a side of the abutment block away from the telescopic spring has an arc-shaped surface.

[0018] By adopting the above technical solution, the arc surface on the abutment block abuts against the inner wall of the multiple tube, thereby increasing the contact area between the abutment block and the multiple tube and improving the stability of the positioning piece in fixing the connecting tube on the multiple tube.

[0019] The utility model is further configured as follows: the arc surface of the abutment block is provided with convex points.

[0020] By adopting the above technical solution, convex points are arranged on the arc surface where the abutment block contacts the multiple tubes, which can increase the friction between the abutment block and the multiple tubes and improve the stability of the connection tube and the multiple tubes being fixed by the positioning piece.

[0021] The utility model is further configured as follows: the abutment block is made of a flexible plastic material.

[0022] By adopting the above technical solution, the abutment block is made of a flexible material, which can prevent the multiple tubes from being damaged when the abutment block contacts the inner wall of the multiple tubes.

[0023] The utility model is further configured as follows: sealing strips are fixed to the inner walls of the plurality of through holes and the two inner walls of the electric fusion sleeve.

[0024] By adopting the above technical solution, a sealing strip is provided in the through hole on the convex ring. When the pressure rod moves in the corresponding through hole, the pressure rod is sealed and connected to the convex ring. The sealing strip is fixed to the inner wall of the second electric fusion sleeve. When the second electric fusion sleeve moves on the connecting pipe, the second electric fusion sleeve is sealed and connected to the connecting pipe, so that the joint and the multiple pipe connection have good sealing performance.

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

[0026] 1. In the utility model, the connecting pipe is placed between two multi-tubes to be connected, and one end of the connecting pipe is inserted into one of the multi-tubes, so that the positioning piece on the connecting pipe and the electric fusion sleeve one are located in the multi-tube, and the two connecting posts one on the electric fusion sleeve one are located outside the multi-tube, and the positioning piece is pressed against the inner wall of the multi-tube, and then the electric fusion sleeve two is moved on the connecting pipe until the electric fusion sleeve two extends into the other multi-tube and the two connecting posts two on the electric fusion sleeve two are located outside the multi-tube. Since the positioning piece has fixed the connecting pipe to one of the multi-tubes, the electric fusion sleeve two is placed Only a small number of staff or even one person are needed to complete the operation of inserting one multi-tube into another multi-tube. After that, the positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns one to energize the heating wire one. The heating wire one heats up to melt the outer periphery of the electric fusion sleeve one and the inner wall of the corresponding multi-tube. After cooling, the two will be fused together. After that, the positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns two, and then the heating wire two is energized. The heating wire two heats up to melt the outer periphery of the electric fusion sleeve two and the inner wall of the corresponding multi-tube. After cooling, the two will be fused together. In this way, the connection of the two multi-tubes is realized, which is very convenient.

[0027] 2. The positioning member in the utility model only requires the staff to grasp the annular handle by hand to move several pressure rods along the length direction of the connecting pipe. The pressure rods will be separated from the corresponding abutment blocks. The several abutment blocks can be pressed against the inner wall of the multiple tube under the elastic force of the corresponding telescopic springs, so that the connecting tube is fixed on the multiple tube. The operation is very convenient and can be achieved without a lot of manpower, which provides convenience for the connection of multiple tubes.

[0028] 3. The cylinder body of the utility model cooperates with the corresponding accordion protective cover to prevent the telescopic spring and the abutment block in the cylinder body from being exposed in the multiple tubes, so that they will not come into contact with the liquid when there is flowing liquid in the multiple tubes, thereby preventing the telescopic spring from being corroded, and preventing the telescopic spring and the abutment block from being washed off by the flowing liquid and contaminating the flowing liquid.

[0029] 4. In the utility model, a sealing strip is arranged in the through hole on the convex ring, a sealing ring is arranged on the first electric fusion sleeve, a sealing strip is fixed on the inner wall of the second electric fusion sleeve, and a sealing ring is arranged on the second electric fusion sleeve, which can improve the sealing performance of the joint connecting two multiple pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 The utility model is a schematic diagram of the overall structure of an internally inserted electric fusion rubber ring double sealing joint for multiple pipes.

[0032] Figure 2 The utility model is a schematic diagram of the cross-sectional structure of an inner-insertion type electric fusion rubber ring double-sealing joint for multiple pipes.

[0033] Figure 3 yes Figure 2 A is a partial enlarged schematic diagram of the middle part.

[0034] Figure 4 It is a structural schematic diagram of the abutment block in the utility model.

[0035] In the figure, 1, connecting tube; 2, positioning piece; 21, telescopic spring; 22, abutment block; 22a, arc surface; 22b, convex point; 3, electric fusion sleeve one; 31, protrusion one; 32, folding part one; 4, electric fusion sleeve two; 41, protrusion two; 42, folding part two; 5, heating wire one; 6, connecting column one; 7, heating wire two; 8, connecting column two; 9, convex ring; 91, through hole; 10, pressure rod; 11, ring handle; 12, sealing ring one; 13, sealing ring two; 14, cylinder; 15, accordion protective cover; 16, sealing strip. DETAILED DESCRIPTION

[0036] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] like Figures 1 to 4 As shown, a multiple-tube internal plug-in electric fusion rubber ring double-sealed joint comprises a connecting tube 1, wherein the outer circumference of the connecting tube 1 is provided with a positioning member 2, an electric fusion sleeve 3 and an electric fusion sleeve 4 in sequence along its length direction, wherein the positioning member 2 and the electric fusion sleeve 3 are positioned on the connecting tube 1, wherein the electric fusion sleeve 4 can move in the length direction of the connecting tube 1 and is sealedly connected to the connecting tube 1, wherein the electric fusion sleeve 3 is provided with an electric heating wire 5 inside, wherein two connecting columns 6 are provided at one end outside the electric fusion sleeve 3, wherein the two connecting columns 6 are respectively connected to the two ends of the electric heating wire 5, wherein the electric heating wire 7 is provided inside the electric fusion sleeve 4, wherein two connecting columns 8 are provided at one end outside the electric fusion sleeve 4, wherein the two connecting columns 8 are respectively connected to the two ends of the electric heating wire 7.

[0038] Furthermore, a convex ring 9 is fixed on the connecting pipe 1, and the inner wall of the electric fusion sleeve 3 is fixedly connected to the outer periphery of the convex ring 9. One side of the convex ring 9 is provided with several through holes 91 penetrating the other side, and the several through holes 91 are evenly spaced around the circumference of the connecting pipe 1. The positioning member 2 includes several telescopic springs 21 evenly spaced around the outer periphery of the connecting pipe 1, and the telescopic springs 21 extend along the radial direction of the connecting pipe 1. One end of the telescopic spring 21 is fixed to the outer periphery of the connecting pipe 1, and the other end of the telescopic spring 21 is fixed to an abutment block 22. Several of the through holes 91 are penetrated by pressure rods 10 extending along the length direction of the connecting pipe 1, and the pressure rods 10 are sealedly connected to the corresponding through holes 91. An annular handle 11 is provided on one side of the convex ring 9, and one end of several of the pressure rods 10 are fixedly connected to the annular handle 11, and the other ends of several of the pressure rods 10 face the outer periphery of the connecting pipe 1 and abut against the corresponding abutment blocks 22 respectively.

[0039] Furthermore, the outer periphery of the electric fusion sleeve 3 is provided with a protrusion 31 near the position where one end of the connecting column 6 is provided, and the electric fusion sleeve 3 is provided with a sealing ring 12, and the protrusion 31 is located between the connecting column 6 and the sealing ring 12. The outer periphery of the electric fusion sleeve 24 is provided with a protrusion 41 near the position where one end of the connecting column 28 is provided, and the electric fusion sleeve 24 is provided with a sealing ring 2 13, and the protrusion 41 is located between the connecting column 28 and the sealing ring 2 13.

[0040] Furthermore, the protrusion 1 31 and the protrusion 2 41 are both annular, the outer diameter of the protrusion 1 31 is the same as the outer diameter of the sealing ring 12, the outer diameter of the protrusion 2 41 is the same as the outer diameter of the sealing ring 2 13, the outer periphery of the protrusion 1 31 has a folding portion 1 32 extending in a direction away from the connecting column 1 6, and the outer periphery of the protrusion 2 41 has a folding portion 2 42 extending in a direction away from the connecting column 2 8.

[0041] Furthermore, the outer periphery of the connecting tube 1 has several cylinders 14 extending radially along the connecting tube 1, each of the cylinders 14 is provided with a telescopic spring 21, the height of the cylinder 14 is less than the length of the telescopic spring 21, and there is a distance between the end of each cylinder 14 away from the connecting tube 1 and the corresponding pressure rod 10.

[0042] Furthermore, an accordion protective cover 15 is fixed to one end of each cylinder 14 away from the connecting pipe 1 , and the abutment block 22 is located inside the accordion protective cover 15 .

[0043] Furthermore, the abutment block 22 has an arc-shaped surface 22 a on a side away from the telescopic spring 21 .

[0044] Furthermore, the arc surface 22 a of the abutting block 22 has a convex point 22 b .

[0045] Furthermore, the abutment block 22 is made of flexible plastic material.

[0046] Furthermore, sealing strips 16 are fixed to the inner walls of the plurality of through holes 91 and the inner wall of the second fusion sleeve 4 .

[0047] The working principle of the utility model is as follows: a connecting pipe 1 is placed between two multi-tubes to be connected, one end of the connecting pipe 1 is inserted into one of the multi-tubes, so that the positioning piece 2 on the connecting pipe 1 and the electric fusion sleeve 3 are located inside the multi-tube, and the two connecting columns 6 on the electric fusion sleeve 3 are located outside the multi-tube. The staff grasps the annular handle 11 by hand to move several pressure rods 10 along the length direction of the connecting pipe 1, so that the pressure rods 10 are separated from the corresponding abutment blocks 22. The several abutment blocks 22 can be pressed against the inner wall of the multi-tube under the elastic force of the corresponding telescopic springs 21, so that the connecting pipe 1 is fixed on the multi-tube, and then the electric fusion sleeve 4 is moved on the connecting pipe 1 until the electric fusion sleeve 4 extends into the other multi-tube and the two connecting columns 6 on the electric fusion sleeve 4 are connected. Column 2 8 is located outside the multiple tube. Since the positioning piece 2 has fixed the connecting tube 1 to one of the multiple tubes, inserting the electric fusion sleeve 2 4 into the other multiple tube can be completed with the participation of only a small number of staff or even one person. Then, the positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns 1 6, and the electric heating wire 1 5 is energized. The electric heating wire 1 5 heats up to melt the outer periphery of the electric fusion sleeve 3 and the inner wall of the corresponding multiple tube. After cooling, the two will be fused together. Then, the positive and negative power lines of the electric fusion welding machine are respectively connected to the two connecting columns 2 8, and then the electric heating wire 2 7 is energized. The electric heating wire 2 7 heats up to melt the outer periphery of the electric fusion sleeve 2 4 and the inner wall of the corresponding multiple tube. After cooling, the two will be fused together. In this way, the connection of the two multiple tubes is realized, which is very convenient.

[0048] The arrangement of the cylinder 14 and the corresponding accordion protective cover 15 on the connecting tube 1 prevents the telescopic spring 21 and the abutment block 22 in the cylinder 14 from being exposed in the multiple tubes, so that they will not come into contact with the liquid when there is flowing liquid in the multiple tubes. The abutment block 22 is made of a flexible plastic material to prevent the multiple tubes from being damaged when connected to the joint. The arcuate surface 22a on the abutment block 22 can abut against the inner wall of the multiple tubes, thereby increasing the contact area between the abutment block 22 and the multiple tubes and improving the stability of the positioning member 2 fixing the connecting tube 1 on the multiple tubes. A convex point 22b is arranged on the arcuate surface 22a where the abutment block 22 contacts the multiple tubes, thereby increasing the friction between the abutment block 22 and the multiple tubes and improving the stability of the connecting tube 1 and the multiple tubes being fixed by the positioning member 2.

Claims

1. Multiple pipes with internally inserted electric fusion rubber ring double seal joint, characterized by: The invention comprises a connecting pipe (1), wherein a positioning member (2), an electric fusion sleeve 1 (3) and an electric fusion sleeve 2 (4) are sequentially arranged on the outer circumference of the connecting pipe (1) along the length direction thereof, wherein the positioning member (2) and the electric fusion sleeve 1 (3) are positioned on the connecting pipe (1), wherein the electric fusion sleeve 2 (4) can move in the length direction of the connecting pipe (1) and is sealedly connected to the connecting pipe (1), wherein an electric heating wire 1 (5) is arranged inside the electric fusion sleeve 1 (3), wherein two connecting posts 1 (6) are arranged at one end of the outer side of the electric fusion sleeve 1 (3), wherein the two connecting posts 1 (6) are respectively connected to the two ends of the electric heating wire 1 (5), wherein an electric heating wire 2 (7) is arranged inside the electric fusion sleeve 2 (4), wherein two connecting posts 2 (8) are arranged at one end of the outer side of the electric fusion sleeve 2 (4), wherein the two connecting posts 2 (8) are respectively connected to the two ends of the electric heating wire 2 (7).

2. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 1, characterized in that: A convex ring (9) is fixed on the connecting pipe (1), the inner wall of the electric fusion sleeve (3) is fixedly connected to the outer periphery of the convex ring (9), a plurality of through holes (91) penetrating the other side are opened on one side of the convex ring (9), and the plurality of through holes (91) are evenly spaced around the circumference of the connecting pipe (1), and the positioning member (2) includes a plurality of telescopic springs (21) evenly spaced around the outer periphery of the connecting pipe (1), and the telescopic springs (21) extend in the radial direction of the connecting pipe (1), and one end of the telescopic springs (21) is fixed to the connecting pipe (1). The outer periphery of the connecting tube (1) is fixed with a contact block (22) at the other end of the telescopic spring (21). A plurality of the through holes (91) are penetrated with a pressure rod (10) extending along the length direction of the connecting tube (1). The pressure rod (10) is sealedly connected to the corresponding through hole (91). An annular handle (11) is provided on one side of the convex ring (9). One end of the plurality of pressure rods (10) is fixedly connected to the annular handle (11). The other ends of the plurality of pressure rods (10) face the side of the outer periphery of the connecting tube (1) and contact with the corresponding abutment blocks (22) respectively.

3. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 1 or 2, characterized in that: The outer periphery of the electric fusion sleeve 1 (3) is provided with a protrusion 1 (31) near a position where one end of the connecting column 1 (6) is provided, and the electric fusion sleeve 1 (3) is provided with a sealing ring 1 (12), and the protrusion 1 (31) is located between the connecting column 1 (6) and the sealing ring 1 (12); the outer periphery of the electric fusion sleeve 2 (4) is provided with a protrusion 2 (41) near a position where one end of the connecting column 2 (8) is provided, and the electric fusion sleeve 2 (4) is provided with a sealing ring 2 (13), and the protrusion 2 (41) is located between the connecting column 2 (8) and the sealing ring 2 (13).

4. The inner-insertion type electric fusion rubber ring double-sealed joint for multiple pipes according to claim 3, characterized in that: The protrusion one (31) and the protrusion two (41) are both annular in shape, the outer diameter of the protrusion one (31) is the same as the outer diameter of the sealing ring one (12), the outer diameter of the protrusion two (41) is the same as the outer diameter of the sealing ring two (13), the outer periphery of the protrusion one (31) has a folded portion one (32) extending in a direction away from the connecting column one (6), and the outer periphery of the protrusion two (41) has a folded portion two (42) extending in a direction away from the connecting column two (8).

5. The inner-insertion type electric fusion rubber ring double-sealed joint for multiple pipes according to claim 2, characterized in that: The outer periphery of the connecting tube (1) has a plurality of cylinders (14) extending radially along the connecting tube (1), each of the cylinders (14) is provided with a telescopic spring (21), the height of the cylinder (14) is less than the length of the telescopic spring (21), and there is a distance between one end of each cylinder (14) away from the connecting tube (1) and the corresponding pressure rod (10).

6. The inner-insertion type electric fusion rubber ring double-sealed joint for multiple pipes according to claim 5, characterized in that: An accordion protective cover (15) is fixed to one end of each cylinder (14) away from the connecting pipe (1), and the abutment block (22) is located inside the accordion protective cover (15).

7. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 2, 5 or 6, characterized in that: The side of the abutment block (22) away from the telescopic spring (21) has an arc-shaped surface (22a).

8. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 7, characterized in that: The arc-shaped surface (22a) of the abutment block (22) is provided with a convex point (22b).

9. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 7, characterized in that: The abutment block (22) is made of flexible plastic material.

10. The multiple-tube internally inserted electric fusion rubber ring double-sealed joint according to claim 2, characterized in that: Sealing strips (16) are fixed to the inner walls of the plurality of through holes (91) and the inner wall of the second electric fusion sleeve (4).

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