Plastic pipes with sealed connection structure

Abstract

This invention discloses a plastic pipe with a sealed connection structure, comprising a sealed connection structure consisting of an annular cavity, an expansion ring, etc.; the second annular groove of the second plastic pipe and the first annular groove of the first plastic pipe are joined to form an annular cavity; the expansion ring comprises a circular hollow elastomer, and the inner cavity of the circular hollow elastomer is filled with compressed gas; after the expansion ring enters the annular cavity, the compressed gas can drive the circular hollow elastomer to expand, causing the expansion ring to expand and press against the cavity wall of the annular cavity, and the expanded expansion ring can seal the gap between the two plastic pipes, so that the two plastic pipes form a sealed connection.

Description

Technical Field

[0001] This invention relates to plastic pipes with a sealed connection structure. Background Technology

[0002] Plastic pipes, as an important component of chemical building materials, are widely accepted by users due to their superior performance, hygiene, environmental friendliness, and low consumption. The main types include UPVC drainage pipes, UPVC water supply pipes, aluminum-plastic composite pipes, polyethylene (PE) water supply pipes, and polypropylene (PPR) hot water pipes. Often, it is necessary to join two plastic pipes together to form a longer pipe, and the joined pipes must form a sealed connection. Summary of the Invention

[0003] The purpose of this invention is to provide a plastic pipe with a sealed connection structure. The plastic pipe includes a plastic round tube with a first end and a second end, respectively. The first end face of the plastic round tube is provided with a first annular groove, and the second end face of the plastic round tube is provided with a second annular groove. The cross-sections of the first annular groove and the second annular groove are both arc-shaped. When the two plastic pipes are joined, the first annular groove and the second annular groove can be closed to form an annular cavity for accommodating an expansion ring. An expansion ring storage structure for conveying the expansion ring to the annular cavity is also provided inside the first annular groove. When the two plastic pipes are joined, the expansion ring enters the annular cavity, expands, and presses against the cavity wall.

[0004] For details of the expansion ring storage structure of this invention, please refer to the embodiments.

[0005] The advantages and beneficial effects of this invention are as follows:

[0006] The joint between two plastic pipes of this invention has a sealing connection structure consisting of an annular cavity, an expansion ring, etc. This sealing connection structure allows the two plastic pipes to form a sealed connection.

[0007] The joint between the two plastic pipes of this invention also includes an expansion ring storage structure consisting of an annular blind hole, a first radial blind hole, a first spring, a locking rod and its upper pin hole, an expansion ring, a second spring, an axial through hole, and a pin. The expansion ring storage structure can store expansion rings and deliver them to the annular cavity when the two plastic pipes are joined.

[0008] The joint between the two plastic pipes of this invention also has a connection locking structure consisting of an axial through hole, a pin and its locking hole, a second radial blind hole, a locking pin, and a third spring. This connection locking structure allows the two plastic pipes to form a locked connection.

[0009] The sealing connection structure of the present invention generates internal pressure that causes the two plastic tubes to separate. This internal pressure can be transmitted to the pin and locking pin of the connection locking structure, causing the pin and the corresponding locking pin to tighten each other, making the locking connection of the two plastic tubes more stable and reliable. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the plastic pipe of the present invention;

[0011] Figure 2 This is a schematic diagram of two plastic pipes before they are joined together;

[0012] Figure 3 This is a schematic diagram of two plastic pipes joined together. Detailed Implementation

[0013] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0014] The specific technical solution of this invention is as follows:

[0015] like Figures 1 to 3 As shown, the present invention provides a plastic pipe with a sealed connection structure. The plastic pipe includes a plastic round tube 1, and the two ends of the plastic round tube 1 are a first end 11 and a second end 12, respectively. When two plastic pipes are connected, the first end 11 of the plastic round tube of one plastic pipe is abutted against the second end 12 of the plastic round tube of the other plastic pipe.

[0016] The first end 11 of the plastic round tube 1 is provided with a first flange ring 21, and the second end 12 of the plastic round tube 1 is provided with a second flange ring 22; both the first flange ring 21 and the second flange ring 22 are annular, and both the first flange ring 21 and the second flange ring 22 are coaxial with the plastic round tube 1;

[0017] The first end 11 of the plastic tube 1 is provided with a first annular groove 31, and the second end 12 of the plastic tube 1 is provided with a second annular groove 32. Both the first annular groove 31 and the second annular groove 32 are annular and coaxial with the plastic tube 1. The cross-sections of the first annular groove 31 and the second annular groove 32 are arc-shaped and are planes passing through the axis of the plastic tube 1. The inner diameters of the first annular groove 31 and the second annular groove 32 (i.e., the inner diameters of the rings containing the first annular groove 31 and the second annular groove 32) are the same, and the outer diameters of the first annular groove 31 and the second annular groove 32 (i.e., the outer diameters of the rings containing the first annular groove 31 and the second annular groove 32) are the same. When joined, the first annular groove 31 and the second annular groove 32 can be closed to form an annular cavity 33 for accommodating the expanded ring 5 after expansion.

[0018] The first annular groove 31 is further provided with an annular blind hole 40 on the side away from the end face of the first end 11. The annular blind hole 40 is circular and coaxial with the plastic tube 1. The inner diameter of the annular blind hole 40 (i.e., the inner diameter of the ring in which the annular blind hole 40 is located) is larger than the inner diameter of the first annular groove 31 (i.e., the inner diameter of the ring in which the first annular groove 31 is located), and the outer diameter of the annular blind hole 40 (i.e., the outer diameter of the ring in which the annular blind hole 40 is located) is smaller than the outer diameter of the first annular groove 31 (i.e., the outer diameter of the ring in which the first annular groove 31 is located). The annular blind hole 40 is provided with a plurality of first radial blind holes 41 at the end near the first annular groove 31. The plurality of first radial blind holes 41 are evenly distributed along the circumference of the ring in which the annular blind hole 40 is located, and each first radial blind hole 41 extends radially into the first flange ring 21. The axes of the first radial blind holes 41 are located in the same plane, and this plane is coaxial with the axis of the plastic tube 1. The center is vertical; each of the first radial blind holes 41 is provided with a locking rod 7 and a first spring 61, and the locking rod 7 and the first spring 61 extend in the same direction as the first radial blind hole 41 in which they are located; the locking rod 7 is located between the first spring 61 and the annular blind hole 40, and the first spring 61 presses the end of the locking rod 7 away from the first spring 61 into the annular blind hole 40; the annular blind hole 40 is also provided with an expansion ring 5 before expansion and a second spring 62; the expansion ring 5 is circular, and the expansion ring 5 and the second spring 62 are coaxial with the plastic tube 1; the expansion ring 5 is located between the locking rod 7 and the second spring 62, and the second spring 62 presses the expansion ring 5 tightly onto each locking rod 7; the expansion ring 5 includes a circular hollow elastic body, the cross-section of which is circular, and the cross-section is a plane passing through the axis of the plastic tube 1; the inner cavity of the circular hollow elastic body is filled with compressed gas, and the compressed gas can drive the circular hollow elastic body to expand;

[0019] The first flange ring 21 is also provided with a plurality of axial through holes 43, which are evenly distributed along the circumference of the first flange ring 21, and the axis of each axial through hole 43 is parallel to the axis of the plastic tube 1; the axis of each axial through hole 43 is located on the same cylindrical surface, and the cylindrical surface is coaxial with the plastic tube 1; the axial through holes 43 correspond one-to-one with the first radial blind holes 41, and the axial through holes 43 penetrate the corresponding first radial blind holes 41; the axis of the axial through holes 43 is parallel to the axis of the corresponding first radial blind holes 41. The axes of the blind holes 41 are located on the same plane, and this plane passes through the axis of the plastic tube 1; the outer end face of the second flange ring 22 (i.e., the end face of the second flange ring 22 opposite to the first flange ring 21) is also provided with a plurality of pins 8, which are evenly distributed along the circumference of the second flange ring 22, and the axis of each pin 8 is parallel to the axis of the plastic tube 1; the axis of each pin 8 is located on the same cylindrical surface, and this cylindrical surface is coaxial with the plastic tube 1; the pins 8 correspond one-to-one with the axial through holes 43. The pin 8 is coaxial with the corresponding axial through hole 43, and the pin 8 can penetrate the corresponding axial through hole 43 when mated; the locking rod 7 is also provided with a pin hole 71 through which the corresponding pin 8 can pass, and the axial through hole 43 passes through the pin hole 71 of the locking rod 7 in the corresponding first radial blind hole 41; the end of the pin 8 away from the second flange ring 22 is obliquely wedge-fitted with the pin hole 71 of the corresponding locking rod 7; the side of the inner wall of the pin hole 71 away from the annular blind hole 40 is: the end of the corresponding pin 8 away from the second flange ring 22. The first inclined surface 72 is driven (i.e., it is wedge-fitted with the end of the pin 8 away from the second flange ring 22); and the first inclined surface 72 faces the first end 11 of the plastic round tube 1; when docking, the pin 8 passes through the pin hole 71 of the corresponding locking rod 7 and the locking rod 7 can be pulled out of the annular blind hole 40; and after each locking rod 7 is pulled out of the annular blind hole 40, the second spring 62 can push the expansion ring 5 into the annular cavity 33; and after the expansion ring 5 is pushed into the annular cavity 33, it can expand and press against the cavity wall of the annular cavity 33.

[0020] The outer peripheral wall of the plastic tube 1 has a plurality of second radial blind holes 42 at one end near the first flange ring 21. These second radial blind holes 42 are evenly distributed circumferentially along the outer peripheral wall of the plastic tube 1, and each second radial blind hole 42 extends radially along the circle containing the outer peripheral wall of the plastic tube 1. The axes of all second radial blind holes 42 are located in the same plane, and this plane is perpendicular to the axis of the plastic tube 1. Each second radial blind hole 42 corresponds one-to-one with an axial through hole 43. The axis of the second radial blind hole 42 and the axis of the corresponding axial through hole 43 are located in the same plane, and this plane passes through the axis of the plastic tube 1. Each second radial blind hole 42 is provided with a locking pin 9 and a third spring 63. The locking pin 9 and the third spring 63 extend in the same direction as the second radial blind hole 42 in which they are located. The third spring 63 is located inside the locking pin 9, and the locking pin 9 passes through the third... Spring 63 is connected to plastic tube 1; the end of pin 8 away from the second flange ring 22 is obliquely engaged with the outer end of the corresponding locking pin 9 (i.e., the end of locking pin 9 away from the third spring 63); the end face of the outer end of locking pin 9 (i.e., the end of locking pin 9 away from the third spring 63) is a second inclined surface 91 that can be driven by the end of the corresponding pin 8 away from the second flange ring 22 (i.e., obliquely engaged with the end of pin 8 away from the second flange ring 22); and the second inclined surface 91 faces the first end 11 of plastic tube 1; pin 8 is also provided with a locking hole 81 at the end away from the second flange ring 22 into which the corresponding locking pin 9 can be inserted, and when docking, after pin 8 passes through the corresponding axial through hole 43, the corresponding locking pin 9 can be inserted into the locking hole 81 of pin 8, and the third spring 63 on the inner side of the locking pin 9 can press the locking pin 9 into the locking hole 81 of pin 8.

[0021] When two plastic pipes are joined together, the first end 11 of the plastic round tube of one plastic pipe is abutted against the second end 12 of the plastic round tube of the other plastic pipe (the plastic round tubes of the two plastic pipes are coaxial); of the two plastic pipes: the plastic pipe joined at the first end 11 is designated as the first plastic pipe 100, and the plastic pipe joined at the second end 12 is designated as the second plastic pipe 200; the plastic round tube of the first plastic pipe 100 is designated as the first plastic round tube 101, and the plastic round tube of the second plastic pipe 200 is designated as the second plastic round tube 201; during joining:

[0022] Make the second end 12 of the second plastic tube 201 face the first end 11 of the first plastic tube 101; make the pin 8 on the second plastic tube 200 correspond one-to-one with the axial through hole 43 on the first plastic tube 100, and make the pin 8 on the second plastic tube 200 face the corresponding axial through hole 43 on the first plastic tube 100.

[0023] Then, the pins 8 on the second plastic tube 200 pass through the corresponding axial through holes 43 on the first plastic tube 100 and over the corresponding locking pins 9 on the first plastic tube 100 until the end face of the second end 12 of the second plastic tube 201 is in contact with the end face of the first end 11 of the first plastic tube 101. At this time, the second plastic tube 201 and the first plastic tube 101 are coaxial. The locking pin 9 of the first plastic tube 100 is inserted into the locking hole 81 of the corresponding pin 8 on the second plastic tube 200 and locks the pin 8. The second annular groove 32 of the second plastic tube 200 and the first annular groove 31 of the first plastic tube 100 are closed to form an annular cavity 33 for accommodating the expanded ring 5 after expansion.

[0024] Furthermore, during the process of the pin 8 on the second plastic tube 200 penetrating the corresponding axial through hole 43 on the first plastic tube 100, the pin 8 on the second plastic tube 200 also penetrates the pin hole 71 on the first plastic tube 100 corresponding to the locking rod 7 and pulls the locking rod 7 out of the annular blind hole 40 of the first plastic tube 100; and after each locking rod 7 on the first plastic tube 100 is pulled out of the annular blind hole 40, the second spring 62 of the first plastic tube 100 pushes the expansion ring 5 of the first plastic tube 100 into the annular cavity 33 between the second plastic tube 201 and the first plastic tube 101, and after the expansion ring 5 is pushed into the annular cavity 33, it expands and presses the cavity wall of the annular cavity 33. The expanded expansion ring 5 seals the gap between the second plastic tube 201 and the first plastic tube 101, and the first plastic tube 100 and the second plastic tube 200 form a sealed connection.

[0025] The present invention provides a sealing connection structure at the joint of two plastic pipes 100 and 200, comprising an annular cavity 33, an expansion ring 5, etc. This sealing connection structure enables the two plastic pipes 100 and 200 to form a sealed connection. Specifically, the second annular groove 32 of the second plastic pipe 200 and the first annular groove 31 of the first plastic pipe 100 close together to form an annular cavity 33; the expansion ring 5 comprises a circular hollow elastic body, and the inner cavity of the circular hollow elastic body is filled with compressed gas; after the expansion ring 5 enters the annular cavity 33, the compressed gas drives the circular hollow elastic body to expand, causing the expansion ring 5 to expand and press against the cavity wall of the annular cavity 33. The expanded expansion ring 5 can seal the gap between the two plastic pipes 100 and 200, thus forming a sealed connection between the two plastic pipes 100 and 200.

[0026] The joint of the two plastic pipes 100 and 200 of the present invention further includes an expansion ring 5 storage structure composed of an annular blind hole 40, a first radial blind hole 41, a first spring 61, a locking rod 7 and its upper pin hole 71, an expansion ring 5, a second spring 62, an axial through hole 43, and a pin 8. The expansion ring 5 storage structure can store the expansion ring 5 and deliver it to the annular cavity 33 when the two plastic pipes 100 and 200 are joined. Specifically: 1) Under normal conditions, the expansion ring 5 is stored in the annular blind hole 40; the first spring 61 presses the locking rod 7 into the annular blind hole 40, and the locking rod 7 can prevent the expansion ring 5 from moving outward; and the second spring 62 presses the expansion ring 5 tightly onto each locking rod 7, keeping the expansion ring 5 in a compressed state; 2) When the two plastic pipes 100 and 200 are joined, during the process of the pin 8 on the second plastic pipe 200 penetrating the corresponding axial through hole 43 on the first plastic pipe 100, the expansion ring 5 on the second plastic pipe 200... The pin 8 also passes through the pin hole 71 corresponding to the locking rod 7 on the first plastic tube 100; and during the process of the pin 8 passing through the pin hole 71 corresponding to the locking rod 7, the first inclined surface 72 of the inner wall of the pin hole 71 is obliquely fitted with the pin 8, and the pin 8 can drive the locking rod 7 to compress the first spring 61, so that the locking rod 7 retracts into the first radial blind hole 41 where it is located so that the locking rod 7 does not block the expansion ring 5 from moving outward; then the second spring 62 in the annular blind hole 40 can drive the expansion ring 5 to move outward, and send the expansion ring 5 into the annular cavity 33.

[0027] The joint of the two plastic tubes 100 and 200 of the present invention also has a connection locking structure consisting of an axial through hole 43, a pin 8 and its locking hole 81, a second radial blind hole 42, a locking pin 9, and a third spring 63. The connection locking structure enables the two plastic tubes 100 and 200 to form a locked connection. Specifically: as the pin 8 on the second plastic tube 200 passes through the corresponding axial through hole 43 on the first plastic tube 100 and passes over the corresponding locking pin 9 on the first plastic tube 100, the second inclined surface 91 at the outer end of the locking pin 9 is obliquely engaged with the pin 8. The pin 8 can drive the locking pin 9 to compress the third spring 63, causing the locking pin 9 to retract into the second radial blind hole 42 so that the locking pin 9 does not obstruct the movement of the pin 8; when the end face of the second end 12 of the second plastic tube 201 is close to the end face of the first end 11 of the first plastic tube 101, the first plastic tube... The locking pin 9 of the first plastic tube 100 is aligned with the locking hole 81 of the corresponding pin 8 on the second plastic tube 200. The third spring 63 inside the locking pin 9 of the first plastic tube 100 pushes the locking pin 9 into the locking hole 81 of the corresponding pin 8 on the second plastic tube 200, and presses the locking pin 9 of the first plastic tube 100 into the locking hole 81 of the corresponding pin 8 on the second plastic tube 200, preventing the locking pin 9 of the first plastic tube 100 from unlocking from the locking hole 81 of the corresponding pin 8 on the second plastic tube 200, so that the two plastic tubes 100 and 200 form a locked connection.

[0028] Furthermore, after expansion, the expansion ring 5 of the present invention presses against the cavity wall of the annular cavity 33; that is, after expansion, the expansion ring 5 presses against the groove wall of the second annular groove 32 of the second plastic tube 200 and the groove wall of the first annular groove 31 of the first plastic tube 100; therefore, the expansion ring 5 applies pressure to both plastic tubes 100 and 200, and tends to separate them; that is, the sealing connection structure of the present invention generates internal pressure that causes the two plastic tubes 100 and 200 to separate. This internal pressure can be transmitted to the pin 8 and locking pin 9 of the connecting locking structure, so that the pin 8 and the corresponding locking pin 9 are pulled together, which can further prevent the locking pin 9 of the first plastic tube 100 from unlocking the locking hole 81 of the corresponding pin 8 on the second plastic tube 200. That is, the internal pressure generated by the sealing connection structure can make the locking connection of the two plastic tubes 100 and 200 more stable and reliable.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A plastic pipe having a sealing connection structure, characterized by, The plastic pipe comprises a plastic round pipe, the first end and the second end are respectively arranged at two ends of the plastic round pipe; a first annular groove is arranged on the first end face of the plastic round pipe, and a second annular groove is arranged on the second end face of the plastic round pipe; the cross sections of the first annular groove and the second annular groove are both arc-shaped; when the two plastic pipes are connected, the first annular groove and the second annular groove can be folded into an annular containing cavity for containing an expansion ring; an expansion ring storage structure is further arranged in the first annular groove, and the expansion ring storage structure can deliver the expansion ring to the annular containing cavity; when the two plastic pipes are connected, the expansion ring enters the annular containing cavity, expands and tightly presses the cavity wall of the annular containing cavity. A first flange ring is arranged on the first end of the plastic round pipe, and a second flange ring is arranged on the second end of the plastic round pipe; a blind annular hole is further arranged on the side of the first annular groove away from the first end face; a plurality of first radial blind holes are arranged in the blind annular hole close to the first annular groove, and each first radial blind hole extends into the first flange ring; a lock rod and a first spring are respectively arranged in each first radial blind hole, and the first spring presses the lock rod into the blind annular hole; an expansion ring and a second spring are further arranged in the blind annular hole, and the second spring tightly presses the expansion ring on each lock rod. The first flange ring is further provided with a plurality of axial through holes; the axial through holes correspond to the first radial blind holes one by one, and the axial through holes penetrate the corresponding first radial blind holes; the outer end face of the second flange ring is further provided with a plurality of plugs; the plugs correspond to the axial through holes one by one, and the plugs can penetrate the corresponding axial through holes when connected; the lock rod is further provided with a pin hole that can be penetrated by the corresponding plug, and the plug penetrating the pin hole of the corresponding lock rod can pull the lock rod out of the blind annular hole when connected; after each lock rod is pulled out of the blind annular hole, the second spring can push the expansion ring into the annular containing cavity; and the expansion ring can expand and tightly press the cavity wall of the annular containing cavity after being pushed into the annular containing cavity. The outer peripheral wall of the plastic round pipe is provided with a plurality of second radial blind holes at one end close to the first flange ring; the second radial blind holes correspond to the axial through holes one by one; a lock pin and a third spring are respectively arranged in each second radial blind hole; the plug is further provided with a lock hole that can be inserted by the corresponding lock pin, and the corresponding lock pin can be inserted into the lock hole of the plug after the plug penetrates the corresponding axial through hole when connected, and the third spring can tightly press the lock pin in the lock hole.

2. The plastic pipe with a sealed joint structure according to claim 1, wherein The expansion ring comprises a circular annular hollow elastic body, and the inner cavity of the circular annular hollow elastic body is filled with compressed gas.

3. The plastic pipe with a sealed joint structure according to claim 1, wherein The inner diameters of the first annular groove and the second annular groove are the same, and the outer diameters of the first annular groove and the second annular groove are the same.

4. The plastic pipe with a sealed joint structure according to claim 1, wherein The inner diameter of the blind annular hole is greater than the inner diameter of the first annular groove, and the outer diameter of the blind annular hole is smaller than the outer diameter of the first annular groove.

5. The plastic pipe with a sealed joint structure according to claim 1, wherein The plurality of first radial blind holes are uniformly distributed along the circumference of the blind annular hole.

6. The plastic pipe with a sealed joint structure according to claim 1, wherein The plug and the pin hole of the corresponding lock rod are in wedge cooperation.

7. The plastic pipe with a sealed joint structure according to claim 6, wherein The inner wall of the pin hole away from the blind annular hole is a first inclined surface that can be driven by the corresponding plug; and the first inclined surface faces the first end of the plastic round pipe.

8. The plastic pipe with a sealed joint structure according to claim 1, wherein The plug and the outer end of the corresponding lock pin are in wedge cooperation.

9. The plastic pipe with a sealed joint structure according to claim 8, wherein The end face of the outer end of the lock pin is a second inclined surface that can be driven by the corresponding plug; and the second inclined surface faces the first end of the plastic round pipe.

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