Steel-plastic pipe fitting with sealing structure

Abstract

The utility model discloses a steel plastic pipe fitting with sealing structure relates to steel plastic pipe technical field, aims at the problem of steel plastic pipe fitting connection place poor tightness and easy steel plastic separation phenomenon, including plastic piece and steel pipe, be provided with sealing mechanism and connecting assembly between plastic piece and steel pipe, the utility model discloses through annular barb inserts barb card slot, rotating ring and fixed ring thread connection, realize the connection of plastic piece and steel pipe, and rotating ring drives the shift of clamping plate, so that clamping plate one side and spacing ring one side contact, realize the locking of rotating ring, improved the stability after plastic piece and steel pipe connection, through the setting of O type sealing washer, sealing washer no.

Description

Technical Field

[0001] This utility model relates to the field of steel-plastic pipe technology, specifically a steel-plastic pipe fitting with a sealing structure. Background Technology

[0002] With the booming development of the gas industry, buried polyethylene pipes have been widely used in urban gas transmission networks. When buried polyethylene gas pipes enter residential areas or reach users above ground, metal pipes are generally used for transportation. Therefore, steel-plastic joint fittings are usually used at the connection between underground PE pipes and above-ground steel pipes.

[0003] In existing steel-plastic pipe fitting technology, the lack of an effective locking structure often leads to poor stability after the plastic part is connected to the steel pipe, and the plastic part is prone to separation from the steel pipe. In addition, the sealing design at the connection is not perfect, resulting in poor sealing performance at the connection of the steel-plastic pipe fitting, which affects the performance and service life of the steel-plastic pipe fitting.

[0004] Therefore, a steel-plastic pipe fitting with a sealing structure is needed to solve the problems of poor sealing at the connection of existing steel-plastic pipe fittings and easy separation of steel and plastic. Utility Model Content

[0005] The purpose of this utility model is to provide a steel-plastic pipe fitting with a sealing structure to solve the problems of poor sealing performance at the connection of steel-plastic pipe fittings in the prior art and the easy occurrence of steel-plastic separation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a steel-plastic pipe fitting with a sealing structure, comprising a plastic part and a steel pipe, wherein a sealing mechanism and a connecting assembly are provided between the plastic part and the steel pipe; The sealing mechanism includes an O-ring groove inside the plastic part, multiple barb grooves inside the plastic part, an O-ring seal installed on the steel pipe that matches the O-ring groove, and annular barbs installed on the steel pipe that correspond to and match the multiple barb grooves.

[0007] It should be noted in the solution that the connecting assembly includes a limiting ring mounted on the plastic part, a rotating ring rotatably mounted on the plastic part, an internal thread opened inside the rotating ring, a sealing groove opened inside the rotating ring, a fixing ring mounted on the steel pipe, an external thread opened on the fixing ring that mates with the internal thread, and a sealing ring installed on one side of the fixing ring and adapted to the sealing groove.

[0008] It is worth noting that a second sealing ring is installed on one side of the plastic part, and a second sealing groove adapted to the second sealing ring is provided on one side of the fixing ring.

[0009] Furthermore, it should be noted that four circumferentially distributed fixed blocks are installed on one side of the rotating ring. A sliding cavity is opened inside the fixed block, and a sliding plate is slidably installed inside the sliding cavity. Two parallel springs are installed between the sliding cavity and the top surface of the sliding plate, and a card plate that slides through the bottom surface of the fixed block is installed on the bottom surface of the sliding plate.

[0010] In a preferred embodiment, one side of the fixing ring is set as an inclined surface, and one side of each of the clamping plates is also set as an inclined surface.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The connection between the plastic part and the steel pipe is achieved by inserting annular barbs into the barb groove and connecting the rotating ring and the fixed ring by threads. The rotating ring drives the clamping plate to move, so that one side of the clamping plate contacts the side of the limiting ring, thereby locking the rotating ring and improving the stability of the connection between the plastic part and the steel pipe. The O-ring, sealing ring one, and sealing ring two are set to improve the sealing performance at the connection between the plastic part and the steel pipe, effectively avoiding the problem of poor sealing performance and easy separation of steel and plastic at the connection of steel-plastic pipe fittings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view cross-sectional structural diagram of the plastic part of this utility model; Figure 3 This is a side view of the rotating ring structure of this utility model; Figure 4 This is a front view cross-sectional structural diagram of one of the fixing blocks of this utility model; Figure 5 This is a front view structural diagram of the steel pipe of this utility model.

[0013] The following are the labels in the diagram: 1. Plastic part; 2. Steel pipe; 3. Sealing mechanism; 31. O-ring groove; 32. Barbed groove; 33. O-ring seal; 34. Annular barb; 4. Connecting assembly; 41. Limiting ring; 42. Rotating ring; 43. Internal thread; 44. Sealing groove one; 45. Fixing ring; 46. External thread; 47. Sealing ring one; 5. Sealing ring two; 6. Sealing groove two; 7. Fixing block; 8. Sliding cavity; 9. Slide plate; 10. Spring; 11. Clamping plate. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example: Figures 1-5 As shown, this utility model provides a technical solution, including a plastic part 1 and a steel pipe 2, with a sealing mechanism 3 and a connecting component 4 provided between the plastic part 1 and the steel pipe 2; The sealing mechanism 3 includes an O-ring 31 formed inside the plastic part 1, multiple barb grooves 32 formed inside the plastic part 1, an O-ring 33 installed on the steel pipe 2 and adapted to the O-ring 31, and annular barbs 34 installed on the steel pipe 2 and corresponding to and adapted to the multiple barb grooves 32.

[0016] Specifically, when the O-ring 33 is inserted into the O-groove 31, the sealing performance at the connection between the plastic part 1 and the steel pipe 2 is improved. When each annular barb 34 is inserted into the corresponding barb groove 32, the stability of the connection between the plastic part 1 and the steel pipe 2 is improved, and the sealing performance at the connection between the plastic part 1 and the steel pipe 2 is also improved.

[0017] Further as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, it is worth noting that the connecting assembly 4 includes a limiting ring 41 mounted on the plastic part 1, a rotating ring 42 rotatably mounted on the plastic part 1, an internal thread 43 formed inside the rotating ring 42, a sealing groove 44 formed inside the rotating ring 42, a fixing ring 45 mounted on the steel pipe 2, an external thread 46 formed on the fixing ring 45 that mates with the internal thread 43, and a sealing ring 47 mounted on one side of the fixing ring 45 and adapted to the sealing groove 44.

[0018] Specifically, when the rotating ring 42 is connected to the fixed ring 45 with the cooperation of the internal thread 43 and the external thread 46, the connection between the plastic part 1 and the steel pipe 2 is realized, preventing the plastic part 1 from separating from the steel pipe 2. At the same time, the sealing ring 47 is inserted into the sealing groove 44, further improving the sealing performance after the plastic part 1 and the steel pipe 2 are connected.

[0019] Further as Figure 2 and Figure 5 As shown, it is worth noting that a sealing ring 2 5 is installed on one side of the plastic part 1, and a sealing groove 2 6 that matches the sealing ring 2 5 is opened on one side of the fixing ring 45.

[0020] Specifically, after the plastic part 1 and the steel pipe 2 are connected and assembled, the sealing ring 2 5 is inserted into the sealing groove 2 6, which can further improve the sealing performance after the plastic part 1 and the steel pipe 2 are connected.

[0021] Further as Figure 1 , Figure 3 and Figure 4 As shown, it is worth noting that four fixed blocks 7 arranged in a circular pattern are installed on one side of the rotating ring 42. A sliding cavity 8 is opened inside the fixed block 7. A sliding plate 9 is slidably installed inside the sliding cavity 8. Two springs 10 arranged in parallel are installed between the sliding cavity 8 and the top surface of the sliding plate 9. A card plate 11 that slides through the bottom surface of the fixed block 7 is installed on the bottom surface of the sliding plate 9.

[0022] Specifically, when the rotating ring 42 is connected to the fixed ring 45, it drives the fixed block 7 and the clamping plate 11 to move. The clamping plate 11 is squeezed by the limiting ring 41, which pushes the slide plate 9 to slide vertically inside the slide cavity 8, so that the clamping plate 11 enters the slide cavity 8. At the same time, the slide plate 9 squeezes the spring 10. When the rotating ring 42 and the fixed ring 45 are fully connected, the clamping plate 11 is no longer squeezed by the limiting ring 41. Under the elastic action of the spring 10, the slide plate 9 drives the clamping plate 11 to move back to its original position. The clamping plate 11 slides out of the slide cavity 8. At this time, one side of the clamping plate 11 contacts the other side of the limiting ring 41, so as to lock the rotating ring 42 and improve the stability after the plastic part 1 and the steel pipe 2 are connected.

[0023] Further as Figure 2 and Figure 4 As shown, it is worth noting that one side of the fixing ring 45 is set as an inclined surface, and one side of each card plate 11 is also set as an inclined surface.

[0024] Specifically, one side of the fixing ring 45 is set as an inclined surface, and one side of each card plate 11 is also set as an inclined surface, so that when the card plate 11 moves, it can move vertically after being squeezed by the fixing ring 45.

[0025] In summary: When assembling this steel-plastic pipe fitting, firstly, the side of the steel pipe 2 with the O-ring 33 and annular barbs 34 is inserted into the interior of the large-diameter section of the plastic part 1. When one side wall of the large-diameter section of the plastic part 1 contacts the side wall of the fixing ring 45 on the steel pipe 2, the O-ring 33 is inserted into the O-groove 31, and each annular barb 34 is inserted into the corresponding barb groove 32. At the same time, the second sealing ring 5 is inserted into the second sealing groove 6. Then, the rotating ring 42 is slid and rotated simultaneously. With the cooperation of the internal thread 43 and the external thread 46, the rotating ring 42 and the fixing ring 45 are gradually threadedly connected. During this process, the lateral movement of the rotating ring 42 drives multiple fixing blocks 7 to move synchronously, so that multiple clamping plates 11 are squeezed by the limiting ring 41. After being forced, the clamping plates 11 push the sliding plate 9 to slide vertically inside the sliding cavity 8, squeezing the spring 10, so that the clamping plates 11 are clamped. Plate 11 enters the interior of the sliding cavity 8. When the rotating ring 42 can no longer move due to the influence of the internal thread 43 and the external thread 46, the rotating ring 42 and the fixed ring 45 are connected, thereby realizing the connection and combination of the plastic part 1 and the steel pipe 2. At the same time, the multiple clamping plates 11 are no longer squeezed by the limiting ring 41. Under the action of the spring 10, the sliding plate 9 drives the clamping plates 11 to reset and move. The clamping plates 11 slide out from the interior of the sliding cavity 8. At this time, one side of the clamping plate 11 contacts one side of the limiting ring 41, locking the rotating ring 42, which improves the stability of the connection between the plastic part 1 and the steel pipe 2 and prevents the phenomenon of separation between the plastic part 1 and the steel pipe 2. With the help of the O-ring 33, sealing ring 1 47 and sealing ring 2 5, the sealing performance at the connection between the plastic part 1 and the steel pipe 2 is improved, effectively avoiding the problem of poor sealing performance at the connection of steel-plastic pipe fittings and easy separation of steel and plastic.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A steel-plastic pipe fitting with a sealing structure, comprising a plastic part (1) and a steel pipe (2), characterized in that: A sealing mechanism (3) and a connecting component (4) are provided between the plastic part (1) and the steel pipe (2); The sealing mechanism (3) includes an O-groove (31) inside the plastic part (1), multiple barb grooves (32) inside the plastic part (1), an O-ring (33) installed on the steel pipe (2) and adapted to the O-groove (31), and annular barbs (34) installed on the steel pipe (2) and adapted to the multiple barb grooves (32).

2. A steel-plastic pipe fitting with a sealing structure according to claim 1, characterized in that: The connecting assembly (4) includes a limiting ring (41) mounted on the plastic part (1), a rotating ring (42) rotatably mounted on the plastic part (1), an internal thread (43) opened inside the rotating ring (42), a sealing groove (44) opened inside the rotating ring (42), a fixing ring (45) mounted on the steel pipe (2), an external thread (46) opened on the fixing ring (45) that mates with the internal thread (43), and a sealing ring (47) mounted on one side of the fixing ring (45) and adapted to the sealing groove (44).

3. A steel-plastic pipe fitting with a sealing structure according to claim 2, characterized in that: A sealing ring 2 (5) is installed on one side of the plastic part (1), and a sealing groove 2 (6) adapted to the sealing ring 2 (5) is opened on one side of the fixing ring (45).

4. A steel-plastic pipe fitting with a sealing structure according to claim 3, characterized in that: Four fixed blocks (7) arranged in a circular pattern are installed on one side of the rotating ring (42). A sliding cavity (8) is provided inside the fixed block (7). A sliding plate (9) is slidably installed inside the sliding cavity (8). Two springs (10) arranged in parallel are installed between the sliding cavity (8) and the top surface of the sliding plate (9). A card plate (11) that slides through the bottom surface of the fixed block (7) is installed on the bottom surface of the sliding plate (9).

5. A steel-plastic pipe fitting with a sealing structure according to claim 4, characterized in that: One side of the fixing ring (45) is set as an inclined surface, and one side of each of the card plates (11) is set as an inclined surface.

Images