Connector sealing structure of nodular cast iron pipe

Abstract

The utility model discloses a nodular cast iron pipe interface sealing structure which comprises a connecting pipe set sleeved outside two cast iron pipe interfaces, the connecting pipe set comprises an internal thread pipe and a connecting pipe, external threads are arranged on the outer sides of the ends, close to each other, of the two cast iron pipes, a first sealing raw material belt is arranged on the outer side of each cast iron pipe, and a second sealing raw material belt is arranged on the outer side of each first sealing raw material belt. Each cast iron pipe is sleeved with a nut in a threaded mode, and a sealing ring is fixedly arranged on the side, close to the connecting pipe, of each nut. The nodular cast iron pipe joint sealing device is reasonable in structural design, the two cast iron pipes are connected to form first-stage sealing, the inner threaded pipe is matched with the first sealing raw material belt to conduct second-stage sealing on the joint of the two cast iron pipes, the nut is matched with the sealing ring to conduct third-stage sealing on the joint of the two cast iron pipes, and the nodular cast iron pipe joint sealing effect is improved; the problems that most connectors of existing nodular cast iron pipes are poor in sealing effect, water loss and water pollution are caused by leakage easily, and the use efficiency of the nodular cast iron pipes is seriously affected are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ductile iron pipes, and in particular relates to an interface sealing structure of a ductile iron pipe. Background Art

[0002] Ductile iron pipes are made of cast iron water of No. 18 or above, after adding spheroidizing agent, and then cast by centrifugal ductile iron casting machine at high speed. They are called "Ductile Cast Iron Pipes", abbreviated as ductile pipes, ductile iron pipes and ductile cast pipes. They are mainly used for the transportation of tap water and are the ideal choice of tap water pipes. Cast iron steel pipes are actually ductile iron pipes. Ductile iron pipes have the nature of iron and the performance of steel, so they are called this. Graphite in ductile iron pipes exists in spherical form, and the size of graphite is generally 6-7. The quality requires that the spheroidization level of cast iron pipes be controlled to 1-3 levels, and the spheroidization rate is ≥80%, so the mechanical properties of the material itself are well improved, with the nature of iron and the performance of steel. After annealing, the metallographic structure of ductile iron pipes is ferrite plus a small amount of pearlite, and the mechanical properties are good, so they are also called cast iron steel pipes.

[0003] Most of the existing ductile iron pipes have poor sealing effects at their interfaces, which are prone to leakage, causing water loss and water pollution, and seriously affecting the efficiency of the use of the ductile iron pipes. Therefore, it is necessary to propose an interface sealing structure for ductile iron pipes to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a ductile iron pipe interface sealing structure in view of the deficiencies in the above-mentioned prior art. The structure is reasonably designed, and a primary seal is formed by connecting two cast iron pipes. The internal threaded pipe cooperates with the first sealing raw tape to perform a secondary seal on the interface of the two cast iron pipes. The nut cooperates with the sealing ring to perform a tertiary seal on the interface of the two cast iron pipes, thereby improving the sealing effect of the ductile iron pipe interface, solving the problem that most of the existing ductile iron pipe interfaces have poor sealing effect, are prone to leakage, cause water loss and water pollution, and seriously affect the efficiency of the use of the ductile iron pipe.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a ductile iron pipe interface sealing structure, characterized in that it includes a connecting pipe group sleeved on the outside of the two cast iron pipe interfaces, the connecting pipe group includes an internal threaded pipe threadedly sleeved on the outside of the connection of the two cast iron pipes and a connecting pipe fixedly sleeved on the outside of the internal threaded pipe, the outer sides of the ends close to each other on the two cast iron pipes are provided with external threads matching the internal threads of the internal threaded pipes, a first sealing raw material tape is provided on the outer side of each of the cast iron pipes, the first sealing raw material tape is used to seal the gap between the cast iron pipe and the internal threaded pipe, a nut is threadedly sleeved on each of the cast iron pipes, the connecting pipe is located between the two nuts, a sealing ring is fixedly provided on the side of the nut close to the connecting pipe, the sealing ring is used to seal the gap between the connecting pipe and the nut, and the sealing ring is sleeved on the outside of the cast iron pipe.

[0006] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that: a threaded sleeve is fixedly provided at one end of one of the cast iron pipes, and an externally threaded pipe threadedly matched with the threaded sleeve is fixed at one end of the other cast iron pipe, and the threaded sleeve is threadedly sleeved on the outside of the externally threaded pipe.

[0007] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that a second sealing raw material tape is arranged on the outer side of the external threaded pipe, and the second sealing raw material tape is used to seal the gap between the external threaded pipe and the threaded sleeve.

[0008] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that: a plurality of L-shaped rods are connected between each of the cast iron pipes and the connecting pipe, an annular groove for sliding connection of the L-shaped rod is provided on the outer side of the cast iron pipe, a sliding block for sliding cooperation with the annular groove is provided at one end of the L-shaped rod, and a plurality of slots for inserting the other end of the L-shaped rod are provided at both ends of the connecting pipe.

[0009] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that: a plurality of positioning screw holes are respectively arranged on the outer sides of both ends of the connecting pipe, the positioning screw holes are opened along the radial direction of the connecting pipe, the number of the positioning screw holes is equal to the number of the slots and corresponds one to one, the bottom of the positioning screw hole is connected to the slot corresponding to it, the inner thread of the positioning screw hole is provided with a positioning screw, the bottom of the positioning screw is rotatably provided with a rotating shaft, and the bottom of the rotating shaft is fixedly provided with a rubber block for resisting the L-shaped rod.

[0010] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that an L-shaped rotating rod is arranged at one end of the positioning screw away from the L-shaped rod.

[0011] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that the nut is fixedly connected to the connecting pipe by a positioning screw.

[0012] The above-mentioned interface sealing structure of a ductile iron pipe is characterized in that the cast iron pipe includes an anti-corrosion layer, a base layer and a wear-resistant layer arranged in sequence from the inside to the outside.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The utility model seals the gap between the cast iron pipe and the internally threaded pipe by using the internally threaded pipe in combination with the first sealing raw tape, which can effectively prevent leakage from occurring at the gap between the cast iron pipe and the internally threaded pipe, and can effectively improve the sealing effect of the interface of the ductile iron pipe inside the internally threaded pipe.

[0015] 2. The utility model seals the gap between the connecting pipe and the nut by using the nut in conjunction with the sealing ring, which can effectively prevent leakage from occurring in the gap between the connecting pipe and the nut, and can further improve the sealing effect of the interface of the ductile iron pipe inside.

[0016] To sum up, the utility model has a reasonable structural design. It connects two cast iron pipes to form a primary seal, uses an internally threaded pipe in conjunction with a first sealing raw tape to perform a secondary seal on the interface of the two cast iron pipes, and uses a nut in conjunction with a sealing ring to perform a tertiary seal on the interface of the two cast iron pipes. This improves the sealing effect of the interface of the ductile iron pipe, solves the problem that most of the existing ductile iron pipe interfaces have poor sealing effects, are prone to leakage, and cause water loss and water pollution, which seriously affects the efficiency of the use of the ductile iron pipe.

[0017] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model.

[0019] Figure 2 The utility model is a schematic diagram of the connection structure between the internally threaded pipe and the cast iron pipe.

[0020] Figure 3 This is a schematic diagram of the connection structure of two cast iron pipes of the utility model.

[0021] Figure 4 It is a schematic diagram of the connection structure of the connecting pipe and two cast iron pipes of the utility model.

[0022] Figure 5 It is a structural schematic diagram of the cast iron pipe of the utility model.

[0023] Figure 6 for Figure 2 Enlarged view of point A.

[0024] Figure 7 for Figure 2 Enlarged view of point B.

[0025] Description of reference numerals:

[0026] 1. L-shaped rod; 2. External thread; 3. Cast iron pipe; 31. Wear-resistant layer; 32. Base layer; 33. Anti-corrosion layer; 4. Nut; 5. Sealing ring; 6. First sealing raw material tape; 7. Internally threaded pipe; 8. Connecting pipe; 9. Positioning screw; 11. Sliding block; 12. Annular groove; 13. L-shaped rotating rod; 14. Positioning screw; 15. Positioning screw hole; 16. Rotating shaft; 17. Rubber block; 18. Externally threaded pipe; 19. Slot; 20. Threaded sleeve; 21. Second sealing raw material tape. DETAILED DESCRIPTION

[0027] like Figures 1 to 7 As shown, the utility model includes a connecting pipe group sleeved on the outside of the interface of two cast iron pipes 3, the connecting pipe group includes an internal threaded pipe 7 threadedly sleeved on the outside of the connection of the two cast iron pipes 3 and a connecting pipe 8 fixedly sleeved on the outside of the internal threaded pipe 7, the outer sides of the ends close to each other on the two cast iron pipes 3 are provided with external threads 2 matching the internal threads of the internal threaded pipe 7, the outer side of each of the cast iron pipes 3 is provided with a first sealing raw material tape 6, the first sealing raw material tape 6 is used to seal the gap between the cast iron pipe 3 and the internal threaded pipe 7, each of the cast iron pipes 3 is threadedly sleeved with a nut 4, the connecting pipe 8 is located between the two nuts 4, and a sealing ring 5 is fixedly provided on the side of the nut 4 close to the connecting pipe 8, the sealing ring 5 is used to seal the gap between the connecting pipe 8 and the nut 4, and the sealing ring 5 is sleeved on the outside of the cast iron pipe 3.

[0028] In actual use, the gap between the cast iron pipe 3 and the internal threaded pipe 7 is sealed by the internal threaded pipe 7 in cooperation with the first sealing raw tape 6, which can effectively avoid leakage in the gap between the cast iron pipe 3 and the internal threaded pipe 7 and effectively improve the interface sealing effect of the ductile iron pipe inside.

[0029] It should be noted that sealing the gap between the connecting pipe 8 and the nut 4 by means of the nut 4 and the sealing ring 5 can effectively avoid leakage in the gap between the connecting pipe 8 and the nut 4, and can further improve the interface sealing effect of the internal ductile iron pipe.

[0030] During specific implementation, the internally threaded tube 7 and the connecting tube 8 are coaxially arranged, the length of the internally threaded tube 7 is smaller than the length of the connecting tube 8 , and both ends of the internally threaded tube 7 are retracted into the connecting tube 8 .

[0031] In specific implementation, the first sealing raw tape 6 is wrapped around the external thread section of the cast iron pipe 3 . When the first sealing raw tape 6 seals the gap between the cast iron pipe 3 and the internal threaded pipe 7 , the first sealing raw tape 6 is located in the gap between the cast iron pipe 3 and the internal threaded pipe 7 .

[0032] In a specific implementation, when the sealing ring 5 seals the gap between the connecting pipe 8 and the nut 4 , one side of the sealing ring 5 is in close contact with the nut 4 , and the other side of the sealing ring 5 is in close contact with an end surface of the connecting pipe 8 .

[0033] like Figure 3 As shown, in this embodiment, a threaded sleeve 20 is fixedly provided at one end of one of the cast iron pipes 3, and an externally threaded pipe 18 threadably matched with the threaded sleeve 20 is fixed at one end of the other cast iron pipe 3, and the threaded sleeve 20 is threadedly sleeved on the outside of the externally threaded pipe 18.

[0034] In actual use, the outer diameter of the threaded sleeve 20 is smaller than the inner diameter of the internal threaded tube 7 .

[0035] like Figure 3 As shown, in this embodiment, a second sealing raw material tape 21 is provided on the outer side of the external threaded pipe 18 , and the second sealing raw material tape 21 is used to seal the gap between the external threaded pipe 18 and the threaded sleeve 20 .

[0036] During actual use, the second sealing raw material tape 21 is wound around the external thread of the externally threaded pipe 18 .

[0037] During specific implementation, by setting up structures such as the internal threaded tube 7, the first sealing raw tape 6, the nut 4, the sealing ring 5, the external threaded tube 18 and the second sealing raw tape 21, when connecting the ductile iron pipe, the external threaded tube 18 is threadedly sleeved on the inner side of the threaded sleeve 20, and under the action of the second sealing raw tape 21, a primary seal can be performed. The threaded seal of the cast iron pipe 3 is arranged in the internal threaded tube 7, and under the action of the first sealing raw tape 6, a secondary seal can be performed. The nut 4 is tightened inwardly, and the nut 4 squeezes the sealing ring 5. Under the action of the sealing ring 5, a tertiary seal can be performed, which improves the sealing effect of the ductile iron pipe interface and solves the problem that most of the existing ductile iron pipe interfaces have poor sealing effects, are prone to leakage, and cause water loss and water pollution, and seriously affect the efficiency of the use of the ductile iron pipe.

[0038] like Figure 2 and Figure 6 As shown, in this embodiment, a plurality of L-shaped rods 1 are connected between each of the cast iron pipes 3 and the connecting pipe 8, an annular groove 12 for sliding connection of the L-shaped rod 1 is provided on the outer side of the cast iron pipe 3, a sliding block 11 for sliding cooperation with the annular groove 12 is provided at one end of the L-shaped rod 1, and a plurality of slots 19 for inserting the other end of the L-shaped rod 1 are provided at both ends of the connecting pipe 8.

[0039] In actual use, two L-shaped rods 1 are connected between each of the cast iron pipes 3 and the connecting pipe 8, and sliding blocks 11 are symmetrically arranged at 180° in the annular groove 12.

[0040] like Figure 6 and Figure 7 As shown, in this embodiment, a plurality of positioning screw holes 15 are respectively provided on the outer sides of both ends of the connecting tube 8, and the positioning screw holes 15 are opened along the radial direction of the connecting tube 8. The number of the positioning screw holes 15 is equal to the number of the slots 19 and corresponds one to one. The bottom of the positioning screw hole 15 is connected to the corresponding slot 19, and the positioning screw hole 15 is internally threaded with a positioning screw 14, and a rotating shaft 16 is rotatably provided at the bottom of the positioning screw 14, and a rubber block 17 for resisting the L-shaped rod 1 is fixedly provided at the bottom of the rotating shaft 16.

[0041] In actual use, through the L-shaped rod 1, slot 19, positioning screw hole 15 and rubber block 17 and other structures, the end of the L-shaped rod 1 away from the sliding block 11 is inserted into the slot 19. Under the action of the rubber block 17, the L-shaped rod 1 is fixed by tightening the positioning screw 14, thereby improving the firmness and stability of the connection between the ductile iron pipes.

[0042] like Figure 6 As shown, in this embodiment, an L-shaped rotating rod 13 is provided at one end of the positioning screw 14 away from the L-shaped rod 1 .

[0043] In this embodiment, the nut 4 is fixedly connected to the connecting pipe 8 via a positioning screw 9 .

[0044] In actual use, the nut 4 is fixedly connected to the connecting pipe 8 through the positioning screw 9, which further improves the firmness and stability of the connection between the ductile iron pipes. The positioning screw 14 is easily disassembled through the L-shaped rotating rod 13.

[0045] like Figure 5 As shown, in this embodiment, the cast iron pipe 3 includes an anti-corrosion layer 33, a base layer 32 and a wear-resistant layer 31 which are arranged in sequence from the inside to the outside.

[0046] In actual use, the wear-resistant layer 31 is provided to improve the wear resistance of the cast iron pipe 3 , and the anti-corrosion layer 33 is provided to improve the anti-corrosion performance of the cast iron pipe 3 .

[0047] During actual use of the utility model, when connecting ductile iron pipes, the external threaded pipe 18 is threadedly inserted in the threaded sleeve 20, and under the action of the second sealing raw tape 21, a primary seal can be performed. The threaded seal of the cast iron pipe 3 is arranged in the internal threaded pipe 7, and under the action of the first sealing raw tape 6, a secondary seal can be performed. The nut 4 is tightened inwardly, and the nut 4 squeezes the sealing ring 5. Under the action of the sealing ring 5, a tertiary seal can be performed, which improves the sealing effect of the ductile iron pipe interface. The end of the L-shaped rod 1 away from the sliding block 11 is inserted in the slot 19. Under the action of the rubber block 17, the L-shaped rod 1 is fixed by tightening the positioning screw 14, which improves the firmness and stability of the connection between the ductile iron pipes. The nut 4 is fixedly connected to the connecting pipe 8 by the positioning screw 9, which further improves the firmness and stability of the connection between the ductile iron pipes. The L-shaped rotating rod 13 is provided to facilitate the disassembly of the positioning screw 14.

[0048] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An interface sealing structure for a ductile iron pipe, characterized in that: The invention comprises a connecting pipe group sleeved on the outside of the interface of two cast iron pipes (3), the connecting pipe group comprising an internally threaded pipe (7) sleeved on the outside of the connection of the two cast iron pipes (3) and a connecting pipe (8) sleeved on the outside of the internally threaded pipe (7), the outer sides of the adjacent ends of the two cast iron pipes (3) are each provided with an external thread (2) matching the internal thread of the internally threaded pipe (7), the outer side of each cast iron pipe (3) is provided with a first sealing raw material tape (6), and the first sealing The raw material tape (6) is used to seal the gap between the cast iron pipe (3) and the internal threaded pipe (7); each of the cast iron pipes (3) is threadedly sleeved with a nut (4); the connecting pipe (8) is located between the two nuts (4); a sealing ring (5) is fixedly provided on the side of the nut (4) close to the connecting pipe (8); the sealing ring (5) is used to seal the gap between the connecting pipe (8) and the nut (4); and the sealing ring (5) is sleeved on the outside of the cast iron pipe (3).

2. The interface sealing structure of a ductile iron pipe according to claim 1, characterized in that: A threaded sleeve (20) is fixedly provided at one end of one of the cast iron pipes (3), and an external threaded pipe (18) threadably matched with the threaded sleeve (20) is fixedly provided at one end of the other cast iron pipe (3), wherein the threaded sleeve (20) is threadably sleeved on the outside of the external threaded pipe (18).

3. A ductile iron pipe interface sealing structure according to claim 2, characterized in that: A second sealing raw material tape (21) is provided on the outer side of the externally threaded pipe (18), and the second sealing raw material tape (21) is used to seal the gap between the externally threaded pipe (18) and the threaded sleeve (20).

4. The interface sealing structure of a ductile iron pipe according to claim 1, characterized in that: A plurality of L-shaped rods (1) are connected between each of the cast iron pipes (3) and the connecting pipe (8); an annular groove (12) for sliding connection of the L-shaped rod (1) is provided on the outer side of the cast iron pipe (3); a sliding block (11) for slidingly matching with the annular groove (12) is provided at one end of the L-shaped rod (1); and a plurality of slots (19) for inserting the other end of the L-shaped rod (1) are provided at both ends of the connecting pipe (8).

5. A ductile iron pipe interface sealing structure according to claim 4, characterized in that: A plurality of positioning screw holes (15) are respectively arranged on the outer sides of both ends of the connecting tube (8). The positioning screw holes (15) are opened along the radial direction of the connecting tube (8). The number of the positioning screw holes (15) is equal to the number of the slots (19) and corresponds to each other. The bottom of the positioning screw hole (15) is connected to the slot (19) corresponding thereto. The positioning screw hole (15) is internally threaded with a positioning screw rod (14). A rotating shaft (16) is rotatably arranged at the bottom of the positioning screw rod (14). A rubber block (17) for resisting the L-shaped rod (1) is fixedly arranged at the bottom of the rotating shaft (16).

6. A ductile iron pipe interface sealing structure according to claim 5, characterized in that: An L-shaped rotating rod (13) is provided at one end of the positioning screw rod (14) away from the L-shaped rod (1).

7. The interface sealing structure of a ductile iron pipe according to claim 1, characterized in that: The nut (4) is fixedly connected to the connecting pipe (8) via a positioning screw (9).

8. The interface sealing structure of a ductile iron pipe according to claim 1, characterized in that: The cast iron pipe (3) comprises an anti-corrosion layer (33), a base layer (32) and a wear-resistant layer (31) which are arranged in sequence from the inside to the outside.

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