CN201680074U - Screw thread type double hot melt steel-plastic composite pipe fitting - Google Patents

Abstract

The utility model discloses a compound pipe fitting is moulded to two hot melt steel of screw thread formula belongs to the pipe connection accessory, the utility model discloses a first pipe fitting and second pipe fitting: the first pipe fitting is provided with a first screw joint end formed by a first plastic body and a first metal sleeve, the first screw joint end forms a first internal thread on the first plastic body, a second internal thread is formed on the first metal sleeve, and the first internal thread is positioned on the inner side of the second internal thread; the second pipe fitting has a second screwed end formed by a second plastic body and a second metal sleeve, the second screwed end forms a first external thread on the second plastic body, a second external thread is formed on the second metal sleeve, and the first external thread is positioned outside the second external thread. When in connection, the first pipe fitting and the second pipe fitting are connected to the end part of the pipe in a double hot melting connection mode, and then the first pipe fitting and the second pipe fitting are connected together through the connection of the first screwed end and the second screwed end, so that the operation is convenient.

Description

Screw-type double hot-melt steel-plastic composite pipe fittings

technical field

The utility model relates to a pipe connection fitting, in particular to a screw-type double hot-melt steel-plastic composite pipe fitting.

Background technique

Plastic pipes or metal-plastic composite pipes connected by double heat fusion (such as a three-layer structure with plastic inner and outer layers and metal in the middle layer and a two-layer structure with metal outer layer and plastic inner layer) , Anti-clogging and other conveniences are superior to traditional metal pipes (such as galvanized pipes). However, when connecting on-site, it is necessary to bring the hot-melt mold to the installation site to heat the double-hot-melt pipe fittings and pipes before the connection can be realized. However, in actual work, it is not always convenient to bring the hot-melt mold to the installation site. For example, when working at high altitudes or in a narrow ceiling, it is not convenient to perform double hot-melt connection, so the popularization and application of plastic pipes or metal-plastic composite pipes connected by double hot-melt is limited.

Utility model content

The technical problem to be solved and the technical task proposed by the utility model are to overcome the defects of inconvenient connection of plastic pipes or metal-plastic composite pipes connected by double hot-melt in high altitude and narrow installation sites, and provide a threaded double-hot-melt steel pipe Plastic composite pipe fittings are used to connect the joint at the end of the pipe to change the connection mode of plastic pipes or metal-plastic composite pipes. For this reason, the utility model adopts the following technical solutions:

The screw-type double hot-melt steel-plastic composite pipe fitting, including the first pipe fitting and the second pipe fitting, is characterized by:

The first pipe part is integrally formed by fitting the first metal sleeve on the first plastic body, and the first pipe part has a first welded end and a first screwed end communicated through a first internal channel: the first The welding end includes a first inner ring wall formed by the first plastic body, a first outer ring wall and a first socket between the first inner ring wall and the first outer ring wall; A threaded end is formed by the first plastic body and the first metal sleeve, a first internal thread is formed on the first plastic body, and a second internal thread is formed on the first metal sleeve, so The first internal thread is located on the inner side of the second internal thread;

The second pipe part is integrally formed by fitting the second metal sleeve on the second plastic body, and the second pipe part has a second welded end and a second screwed end communicated through the second internal channel: the second The welding end includes a second inner ring wall formed by the second plastic body, a second outer ring wall and a second socket between the second inner ring wall and the second outer ring wall; the first The two threaded ends are formed by the second plastic body and the second metal sleeve, the first external thread is formed on the second plastic body, and the second external thread is formed on the second metal sleeve, so The first external thread is located on the outer side of the second external thread;

The first internal channel is formed by a first plastic body; the second internal channel is formed by a second plastic body.

The beneficial effect of the utility model is that the first pipe fitting and the second pipe fitting of the screw-type double hot-melt steel-plastic composite pipe fitting can be connected to the end of the plastic pipe or the metal-plastic composite pipe through double hot-melt connection. Then, the first pipe piece and the second pipe piece are connected together through the connection between the first threaded end and the second threaded end, which is convenient for operation. Compared with the operation mode in which the hot-melt mold needs to be brought to the installation site during the double-hot-melt connection, the utility model is not restricted by the operation site for changing the connection mode of the plastic pipe or the metal-plastic composite pipe.

Moreover, by providing the metal sleeve and providing threads on the metal sleeve, the strength of the threaded connection between the first pipe piece and the second pipe piece is ensured.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the first pipe fitting double hot-melt connection metal-plastic composite pipe of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the second pipe fitting double hot-melt connection metal-plastic composite pipe of the present invention.

Fig. 3 is a schematic cross-sectional structural view of the connection of the first pipe and the second pipe of the present invention.

Explanation of symbols in the figure:

1-first pipe fitting, 11-first metal sleeve, 12-first plastic body, 13-first internal channel, 14-first welded end, 15-first screwed end, 16-first inner ring wall, 17-first outer ring wall, 18-first socket, 19-first internal thread, 110-second internal thread, 111-reinforcing edge, 112-vent hole, 113-ring groove, 114-axial support Surface, 115-sealing ring;

2-second pipe fitting, 21-second metal sleeve, 22-second plastic body, 23-second internal channel, 24-second welded end, 25-second screwed end, 26-second inner ring wall, 27-second outer ring wall, 28-second socket, 29-first external thread, 210-second external thread, 211-reinforcing edge, 212-vent, 213-ring groove;

31, 32 - pipe; 41, 42 - cover; 51, 52 - fusion tumor; 61, 62 - inner liner.

Detailed ways

Below in conjunction with description, the utility model is further described.

The threaded double hot-melt steel-plastic composite pipe fitting of the utility model includes a first pipe fitting 1 and a second pipe fitting 2:

As shown in Figure 1, the first pipe piece 1 is embedded on the first plastic body 12 by the first metal sleeve 11 (for example, the first metal sleeve is placed in the mold as an insert during injection molding and plastic is injection molded into an inseparable whole) Formed as a whole, the first pipe 1 has a first welded end 14 and a first screwed end 15 communicated through a first internal passage 13: the first welded end 14 includes a first inner ring wall 16 formed by a first plastic body 12, The first outer ring wall 17 and the first socket 18 between the first inner ring wall 16 and the first outer ring wall 17 (see FIG. 3 ); the first threaded end 15 consists of the first plastic body 12, the first The metal sleeves 11 are formed together, a first internal thread 19 is formed on the first plastic body 12, a second internal thread 110 is formed on the first metal sleeve 11, and the first internal thread 19 is located inside the second internal thread 110;

As shown in Figure 2, the second pipe 2 is embedded by the second metal sleeve 21 (similarly, the first metal sleeve is placed in the mold as an insert during injection molding and is injection molded into an inseparable whole with the plastic) on the second plastic body 22 As a whole, the second pipe member 2 has a second welded end 24 and a second screwed end 25 communicated through a second internal passage 23: the second welded end 24 includes a second inner ring wall 26 formed by a second plastic body 22 , the second outer ring wall 27 and the second socket 28 between the second inner ring wall 26 and the second outer ring wall 27 (see FIG. 3 ); the second threaded end 25 consists of the second plastic body 22, the second Two metal sleeves 21 are formed, a first external thread 29 is formed on the second plastic body 22, a second external thread 210 is formed on the second metal sleeve 21, and the first external thread 29 is located outside the second external thread 210;

The first internal channel 13 is formed by the first plastic body 12 ; the second internal channel 23 is formed by the second plastic body 21 .

When utilizing the thread button type double hot-melt steel-plastic composite pipe fittings of the present utility model to connect the pipes, as shown in Figures 1 and 2, the pipes 31, 32 (plastic pipes or metal-plastic composite pipes) are respectively connected in the double hot-melt connection mode. In the first socket 18 of the first pipe 1 and the second socket 28 of the second pipe 2, the first pipe 1 is connected to the first screw end 15 and the second screw end 25 as shown in FIG. It is connected with the second pipe fitting 2 for easy operation. Compared with the operation mode in which the hot-melt mold needs to be brought to the installation site during the double-hot-melt connection, the utility model is not restricted by the operation site for changing the connection mode of the plastic pipe or the metal-plastic composite pipe. In order to prevent the first metal sleeve 11 and the second metal sleeve 21 from being corroded in contact with the medium in the first internal passage 13 and the second internal passage 23, when the first screw connection end 15 and the second screw connection end 25 are connected, It is required that the first internal thread 19 formed on the first plastic body 12 is threadedly engaged with the first external thread 29 formed on the second plastic body 22, so that the first metal sleeve 11, the second metal sleeve 21 and the first The inner channel 13 and the second inner channel 23 are isolated to avoid corrosion due to contact with medium.

In view of the fact that the screw-type double hot-melt steel-plastic composite pipe fitting can prevent the first metal sleeve 11 and the second metal sleeve 21 from being corroded, the first metal sleeve 11 and the second metal sleeve 21 can be made of steel instead of copper, so that Save manufacturing cost.

Further, in order to avoid exposure of the double hot-melt joints, a cover 41, 42 is placed on the pipes 31, 32 to cover the hot-melt joints, and the covers 41, 42 are stuck in the corresponding ring grooves 113, 213.

As a further improvement and supplement to the above-mentioned technical solution, the utility model also includes the following additional technical features, although Fig. 13 includes all the following additional technical features, is a preferred embodiment of the utility model, but the utility model is not limited to This situation, when implementing the utility model, they are selected on the technical scheme described in the previous paragraph according to specific effects:

The first internal thread 19 is adjacent to the second internal thread 110 ; the first external thread 29 is adjacent to the second external thread 210 . Therefore, the internal thread and the external thread are respectively integrated, and the thread can be processed after the first pipe piece and the second pipe piece are formed during manufacture.

The part of the first plastic body 12 inside the first internal thread 19 forms an axial support surface 114 , and a sealing ring 115 corresponding to the second plastic body 22 forming the first external thread 29 is arranged on the axial support surface 114 . Therefore, when they are connected together as shown in FIG. 3 , the sealing ring 115 is squeezed between the axial support surface 114 of the first plastic body and the end of the second plastic body 22 to achieve a better sealing effect and effectively The first metal sleeve 11 and the second metal sleeve 21 are isolated from the first internal channel 13 and the second internal channel 23 . As a specific form of the sealing ring, it may be an o-ring or other forms of sealing rings.

Reinforcing edges 111 and 211 are respectively provided on the parts where the first metal sheath 11 and the second metal sheath 21 are embedded in the plastic body. It is used to ensure the bonding strength of the first metal sleeve, the second metal sleeve and the plastic body.

The first plastic body 12 and the second plastic body 12 are respectively provided with exhaust holes 112, 212 communicating with the first socket 18 and the second socket 28, so as to avoid forming air resistance when double hot-melt connection (when hot-melt connection , the air in the socket can be discharged through the vent hole, avoiding the formation of a closed air cavity, reducing the socket resistance, avoiding the formation of air bubbles in the welding part, and ensuring the welding effect), therefore, the vent hole can be an axial hole, Radial holes are also possible.

The inner walls of the first outer ring wall 17 and the second outer ring wall 27 are provided with ring grooves 113 , 213 for accommodating the fusion tumors 51 , 52 generated during double hot-melt connection.

The inner bushings 61, 62 can be made of copper, which can be used to make the inner ring wall when welding.

The threaded double hot-melt steel-plastic composite pipe fitting of the present invention is illustrated through an example above, but as other forms of the present invention, the pipe fittings can also be in the form of elbows, tees, crosses, etc., but in order to facilitate installation , both the first pipe fitting and the second pipe fitting preferably have one welded end (as long as the installation occasion is suitable, two or more welded ends are not excluded, such as when the first pipe fitting and the second pipe fitting are tees, there can be one Screwed ends and two welded ends, such as the first pipe fitting and the second pipe fitting can have two screwed ends and two welded ends or one screwed end and three welded ends respectively when the first pipe fitting and the second pipe fitting are four-way).

This pipe fitting is also suitable for the transition connection of valves such as PP-R pipes and PE pipes.

Claims (7)

1. Screw-type double hot-melt steel-plastic composite pipe fittings, including the first pipe fitting (1) and the second pipe fitting (2), characterized by: The first pipe part (1) is integrally formed by fitting the first metal sleeve (11) on the first plastic body (12), and the first pipe part (1) has a first internal passage (13) communicating with it A welded end (14) and a first screwed end (15): the first welded end (14) includes a first inner ring wall (16) formed by the first plastic body (12), a first The outer ring wall (17) and the first socket (18) between the first inner ring wall (16) and the first outer ring wall (17); the first threaded end (15) is formed by The first plastic body (12) and the first metal sleeve (11) are formed, the first internal thread (19) is formed on the first plastic body (12), and the first metal sleeve (19) is formed on the first metal sleeve ( 11) forming a second internal thread (110), the first internal thread (19) is located inside the second internal thread (110); The second pipe (2) is integrally formed by fitting the second metal sleeve (21) on the second plastic body (22), and the second pipe (2) has a second internal passage (23) communicating Two welded ends (24) and second screwed ends (25): the second welded end (24) includes the second inner ring wall (26) formed by the second plastic body (22), the second The outer ring wall (27) and the second socket (28) between the second inner ring wall (26) and the second outer ring wall (27); the second threaded end (25) is formed by The second plastic body (22) and the second metal sleeve (21) are formed, the first external thread (29) is formed on the second plastic body (22), and the second metal sleeve ( 21) forming a second external thread (210), the first external thread (29) is located outside the second external thread (210); The first internal channel (13) is formed by the first plastic body (12); the second internal channel (23) is formed by the second plastic body (22). 2. The threaded double hot-melt steel-plastic composite pipe fitting according to claim 1, characterized in that the first internal thread (19) is adjacent to the second internal thread (110); the first external thread (29) adjoins the second external thread (210). 3. The screw-type double hot-melt steel-plastic composite pipe fitting according to claim 1, characterized in that the first plastic body (12) is located inside the first internal thread (19) to form an axial A supporting surface (114), on which a sealing ring (115) corresponding to the second plastic body (22) forming the first external thread (29) is arranged. 4. The threaded double hot-melt steel-plastic composite pipe fitting according to claim 3, characterized in that the sealing ring (115) is an ○-shaped ring. 5. The screw-type double hot-melt steel-plastic composite pipe fitting according to claim 1, characterized in that the parts of the first metal sleeve (11) and the second metal sleeve (21) embedded in the plastic body are respectively A reinforcing edge (111, 211) is provided. 6. The screw-type double hot-melt steel-plastic composite pipe fitting according to claim 1, characterized in that the first plastic body (12) and the second plastic body (22) are respectively provided with a connecting first socket ( 18), the exhaust holes (112, 212) of the second socket (28). 7. The threaded double hot-melt steel-plastic composite pipe fitting according to claim 1, characterized in that ring grooves are opened on the inner walls of the first outer ring wall (17) and the second outer ring wall (27) (113, 213).

Images