Connecting device for steel-plastic composite pipe, and steel-plastic composite connecting pipe

Abstract

A connecting device (100) for a steel-plastic composite pipe (200), and a steel-plastic composite connecting pipe (1000). The connecting device (100) comprises a core (110); a channel for transferring a material is formed inside the core (110); the core (110) comprises insertion portions (111) and a limiting portion (112), the limiting portion (112) is located between the two adjacent insertion portions (111), and the outer diameter of the limiting portion (112) is greater than that of the insertion portions (111); a special-shaped sealing ring (120) is sleeved on the outer surfaces of the insertion portions (111); the special-shaped sealing ring (120) comprises blocking portions (121); the diameter of each of the blocking portions (121) gradually increases in a direction from the corresponding insertion portion (111) to the limiting portion (112), and the blocking portions (121) are arranged spaced from the limiting portion (112). The steel-plastic composite connecting pipe (1000) comprises the steel-plastic composite pipe (200), a pipe fitting (300), and the connecting device (100). The connecting device (100) ensures separation of an end portion of the steel-plastic composite pipe (200) from water, thereby avoiding the risk of failure of the steel-plastic composite pipe (200) when exposed to water, preventing the problems of bulging and steel-plastic separation from occurring in the steel-plastic composite pipe (200), and reducing the difficulty in connecting the steel-plastic composite pipe (200).

Description

Connecting device for steel-plastic composite pipe and steel-plastic composite connecting pipe

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2024205527956, filed with the Chinese Patent Office on March 20, 2024, entitled “Connecting device for steel-plastic composite pipes and steel-plastic composite connecting pipes,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the technical field of pipeline connection, and in particular to a connecting device for a steel-plastic composite pipeline and a steel-plastic composite connecting pipeline. Background Art

[0004] Steel-plastic composite pipes feature a stainless steel inner layer and a plastic outer layer. The metal and plastic layers are bonded together with hot-melt adhesive, resulting in a co-extruded metal, adhesive, and plastic layer from the inside out. Furthermore, current steel-plastic composite pipes utilize a socket-and-spigot hot-melt connection between the pipe and fittings. This connection, combined with the pipe's multi-layered structure, causes the pipe's end faces to come into contact with water, rendering the glue ineffective under conditions of heat and water pressure. Large temperature differences near the pipe cause the pipe to expand and contract, accelerating the delamination of the plastic and metal. Water entering the separation layer can cause the pipe to bulge and burst, severely impacting its pressure-bearing strength and service life. Furthermore, the adhesive layer can cause secondary water contamination.

[0005] Currently, to address the issues of bulging and separation of the steel and plastic at the joints of steel-plastic composite pipes, connecting pipes are typically installed at the joints to isolate the water from the joints. However, when the water pressure within the pipes increases, the connecting pipes can easily shift, leading to bulging and separation of the steel and plastic. Furthermore, to prevent water from entering the end faces of the steel-plastic composite pipes, the sealing requirements at the joints between the connecting pipes are high. Increasing the number of sealing rings further increases the difficulty of connecting the steel-plastic composite pipes.

[0006] Summary of the Invention

[0007] The purpose of the present disclosure is to provide a connecting device for steel-plastic composite pipes and a steel-plastic composite connecting pipe, which can prevent water from entering the end face of the steel-plastic composite pipe, while preventing the connecting device from shifting, thereby reducing the difficulty of connecting the steel-plastic composite pipe.

[0008] The embodiments of the present disclosure are implemented as follows:

[0009] In the first aspect, the present disclosure provides a connecting device for steel-plastic composite pipes, including a core body, wherein a channel for transferring materials is formed inside the core body, which can be used to isolate the materials from the open end of the steel-plastic composite pipe, preventing water from entering the open end of the steel-plastic composite pipe, thereby causing bulging and separation of steel and plastic.

[0010] Furthermore, the core body includes an insertion part and a limiting part. The insertion part is used to cooperate with the steel-plastic composite pipe or pipe fitting so that the steel-plastic composite pipe and the pipe fitting are connected at the interface in a material-isolated manner. Therefore, it can be understood that the number of the insertion parts is two.

[0011] The limiting part is a structure used to limit the depth of the steel-plastic composite pipes and fittings inserted into the core body, so as to ensure that enough steel-plastic composite pipes and fittings are inserted into the core body, and prevent one side from being inserted too much and the other side from being inserted too little, which will affect the connection effect. Therefore, it can be understood that there is one limiting part, and it is located between two adjacent insertion parts. At the same time, in order to ensure that the limiting part can play a limiting role, the outer diameter of the limiting part is larger than the outer diameter of the insertion part.

[0012] Furthermore, in order to prevent the core body from shifting due to the impact of material pressure, the outer surface of the insertion part is covered with a special-shaped sealing ring, which includes a blocking part, the diameter of the blocking part increases successively along the direction from the insertion part to the limiting part, and the blocking part and the limiting part are spaced apart.

[0013] The blocking part and the limiting part of the special-shaped sealing ring are arranged at intervals. When the steel-plastic composite pipe and pipe fittings are inserted into the insertion part, they will be stuck in the interval between the blocking part and the limiting part, which is used to limit the steel-plastic composite pipe and pipe fittings. The closer the diameter of the special-shaped sealing ring is to the limiting part, the larger it is. When the water pressure is high, the setting of the blocking part can avoid the displacement of the steel-plastic composite pipe and pipe fittings, and effectively prevent the problems of bulging of the steel-plastic composite pipe and separation of steel and plastic. At the same time, the change in the diameter of the special-shaped sealing ring can also make the insertion of the steel-plastic composite pipe and pipe fittings easier, reducing the difficulty of connecting the steel-plastic composite pipe.

[0014] In an optional embodiment, in order to further reduce the difficulty of connecting the steel-plastic composite pipes and fittings, the special-shaped sealing ring also includes a socket end, which is located at one end of the limiting portion away from the core body, and the socket end is an arc-shaped structure. The arc-shaped socket end can facilitate the insertion of the steel-plastic composite pipes and fittings, and the arc-shaped structure is connected to the small diameter end of the blocking portion.

[0015] In an optional embodiment, the arc structure of the socket end may be spherical or partially cut spherical, and the diameter of the arc of the socket end is 1 to 3 mm, for example, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0016] In an optional embodiment, the height of the blocking portion is less than the maximum height of the socket end to ensure a stable connection between the pipe fitting and the steel-plastic composite pipe at the blocking portion, and to prevent the blocking portion from exerting excessive thrust on the pipe fitting and the steel-plastic composite pipe, thereby affecting the connection life of the connection.

[0017] In an optional embodiment, the length of each insertion portion is 0.35 to 0.45 times the length of the core, preferably 0.4 times. Therefore, in each core, the two insertion portions together account for 4 / 5 of the core length, and the remaining length can be used to set the limit portion.

[0018] In an optional embodiment, each insertion portion of the core body is provided with a guide bend at one end away from the stop portion. The guide bend bends along the outer surface of the core body, and the height of the guide bend is less than the height of the blocking portion of the shaped sealing ring. The guide bend not only limits the position of the shaped sealing ring, so that the shaped sealing ring is accommodated between the guide bend and the stop portion, but also provides guidance during the connection process between the steel-plastic composite pipe and pipe fitting and the core body, facilitating the insertion of the steel-plastic composite pipe and pipe fitting into the core body.

[0019] In a second aspect, the present disclosure provides a steel-plastic composite connecting pipe, comprising a steel-plastic composite pipe, a pipe fitting and a connecting device as described in any of the aforementioned embodiments; the steel-plastic composite pipe and the pipe fitting are respectively sleeved on two adjacent insertion parts of the connecting device, and the limiting part separates the steel-plastic composite pipe and the pipe fitting.

[0020] In an optional embodiment, the inner surface of one end of the pipe fitting for connection with the connecting device is provided with a flare, and the diameter expansion direction of the flare is along the outer surface direction of the pipe fitting.

[0021] In an optional embodiment, an insert is further installed at one end of the pipe away from the connecting device. The insert protrudes from the end face of the pipe, which can reduce the processing accuracy of the pipe.

[0022] In an optional embodiment, the pipe fitting includes any one of a straight, an elbow or a tee.

[0023] In an optional embodiment, the pipe includes an inner metal pipe and an outer plastic pipe.

[0024] In some embodiments, the inner metal pipe is welded to the insert, and then a plastic pipe is formed on the surface of the metal pipe by injection molding, thereby obtaining a pipe for connecting to a steel-plastic composite pipe. Therefore, in order to reduce the precision control of the injection molding process, improve the production efficiency of the pipe, and ensure product quality, the insert protrudes from the end face of the pipe.

[0025] The beneficial effects of the embodiments of the present disclosure are:

[0026] The present invention provides a connection device for steel-plastic composite pipes and a steel-plastic composite connection pipe. By providing an insertion portion and a limiting portion, the insertion portion is used to insert the steel-plastic composite pipe and pipe fittings, and the steel-plastic composite pipe and pipe fittings are separated by the limiting portion, which can help with installation and positioning, ensure that the steel-plastic composite pipe and pipe fittings are sufficiently inserted, separate the end of the steel-plastic composite pipe from the water, and avoid the risk of failure of the steel-plastic composite pipe when it encounters water. In addition, a special-shaped sealing ring is provided on the insertion portion, and the blocking portion and the limiting portion of the special-shaped sealing ring are spaced apart, which can be used to clamp the steel-plastic composite pipe and pipe fitting for limiting. The closer the diameter of the special-shaped sealing ring is to the limiting portion, the larger it is. When the water pressure is high, the setting of the blocking portion can avoid the displacement of the steel-plastic composite pipe and pipe fitting, effectively preventing the problem of bulging of the steel-plastic composite pipe and separation of steel and plastic. At the same time, the change in the diameter of the special-shaped sealing ring can also make the insertion of the steel-plastic composite pipe and pipe fittings easier, reducing the difficulty of connecting the steel-plastic composite pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0028] FIG1 is a schematic structural diagram of a connecting device for a steel-plastic composite pipe provided in a first embodiment of the present disclosure;

[0029] FIG2 is a schematic structural diagram of a steel-plastic composite connecting pipe provided in a second embodiment of the present disclosure;

[0030] FIG3 is an exploded view of the structure of a steel-plastic composite connecting pipe provided in a second embodiment of the present disclosure;

[0031] FIG4 is an enlarged view of structure A in FIG3 .

[0032] Icons: 100-connecting device; 110-core; 111-insertion part; 112-limiting part; 120-special-shaped sealing ring; 121-blocking part; 122-socket end; 123-guide bend; 1000-steel-plastic composite connecting pipe; 200-steel-plastic composite pipe; 300-pipe fitting; 310-flaring; 320-insert. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, but not all of them. Generally, the components of the embodiments of the present disclosure described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure as claimed, but merely represents selected embodiments of the present disclosure. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort shall fall within the scope of protection of the present disclosure.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of the present disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the disclosed product is typically placed when in use. These terms are intended solely to facilitate the description of the present disclosure and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure. Furthermore, the terms "first," "second," "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0038] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0039] First embodiment

[0040] Please refer to Figure 1 and Figure 2. This embodiment provides a connecting device 100 for a steel-plastic composite pipe, which includes a core body 110. A channel for transferring materials is formed inside the core body 110, which can be used to isolate the material from the open end of the steel-plastic composite pipe 200, preventing water from entering the open end of the steel-plastic composite pipe 200, thereby causing bulging and separation of steel and plastic.

[0041] Furthermore, the core body 110 includes an insertion portion 111 and a limiting portion 112. The insertion portion 111 is used to cooperate with the steel-plastic composite pipe 200 or the pipe fitting 300 to connect the steel-plastic composite pipe 200 and the pipe fitting 300 in a material-isolated manner at the interface. Therefore, it can be understood that the number of the insertion portions 111 is two.

[0042] The limiting portion 112 is a structure used to limit the depth of the steel-plastic composite pipe 200 and the pipe fitting 300 inserted into the core body 110, so as to ensure that there are enough steel-plastic composite pipes 200 and pipe fittings 300 inserted into the core body 110, and prevent one side from being inserted too much and the other side from being inserted too little, which will affect the connection effect. Therefore, it can be understood that there is one limiting portion 112 and it is located between two adjacent insertion portions 111. At the same time, in order to ensure that the limiting portion 112 can play a limiting role, the outer diameter of the limiting portion 112 is greater than the outer diameter of the insertion portion 111.

[0043] Furthermore, in order to prevent the core body 110 from being displaced by the impact of material pressure, the outer surface of the insertion part 111 is covered with a special-shaped sealing ring 120, and the special-shaped sealing ring 120 includes a blocking part 121, and the diameter of the blocking part 121 increases successively along the direction from the insertion part 111 to the limiting part 112, and the blocking part 121 is spaced apart from the limiting part 112.

[0044] The blocking portion 121 of the special-shaped sealing ring 120 is spaced apart from the limiting portion 112. When the steel-plastic composite pipe 200 and the pipe fitting 300 are inserted into the insertion portion 111, they will be stuck in the gap between the blocking portion 121 and the limiting portion 112, and are used to limit the steel-plastic composite pipe 200 and the pipe fitting 300. The closer the diameter of the special-shaped sealing ring 120 is to the limiting portion 112, the larger it is. When the water pressure is high, the setting of the blocking portion 121 can avoid the displacement of the steel-plastic composite pipe 200 and the pipe fitting 300, and effectively prevent the problem of bulging of the steel-plastic composite pipe 200 and separation of steel and plastic. At the same time, the change in the diameter of the special-shaped sealing ring 120 can also make the insertion of the steel-plastic composite pipe 200 and the pipe fitting 300 easier, reducing the difficulty of connecting the steel-plastic composite pipe 200.

[0045] In this embodiment, in order to further reduce the difficulty of connecting the steel-plastic composite pipe 200 and the pipe fitting 300, the special-shaped sealing ring 120 also includes a socket end 122, and the socket end 122 is located at one end of the limiting portion 112 away from the core body 110. The socket end 122 is an arc-shaped structure. The arc-shaped socket end 122 can facilitate the insertion of the steel-plastic composite pipe 200 and the pipe fitting 300, and the arc-shaped structure is connected to the small diameter end of the blocking portion 121.

[0046] Specifically, the special-shaped sealing ring 120 provided in this embodiment is composed of a socket end 122 formed by partially cutting a sphere, and a trapezoidal blocking portion 121 , and the length of each inserting portion 111 is 2 / 5 of the length of the core body 110 .

[0047] Furthermore, each insertion portion 111 of the core 110 is provided with a guide bend 123 at one end away from the limiting portion 112. The guide bend 123 bends along the outer surface of the core 110, and the height of the guide bend 123 is less than the height of the blocking portion 121 of the shaped sealing ring 120. The guide bend 123 can, on the one hand, limit the position of the shaped sealing ring 120, so that the shaped sealing ring 120 is accommodated between the guide bend 123 and the limiting portion 112; on the other hand, the guide bend 123 can also provide guidance during the connection process between the steel-plastic composite pipe 200 and the pipe fitting 300 and the core 110, facilitating the insertion of the steel-plastic composite pipe 200 and the pipe fitting 300 into the core 110.

[0048] Second embodiment

[0049] Referring to Figure 2, this embodiment provides a steel-plastic composite connecting pipe 1000, which includes a steel-plastic composite pipe 200, a pipe fitting 300 and the connecting device 100 provided in the first embodiment; the steel-plastic composite pipe 200 and the pipe fitting 300 are respectively sleeved on two adjacent insertion parts 111 of the connecting device 100, and the limiting part 112 separates the steel-plastic composite pipe 200 and the pipe fitting 300.

[0050] 3 and 4 , in this embodiment, the pipe fitting 300 is an elbow. The inner surface of one end of the pipe fitting 300 for connection to the connecting device 100 is provided with a flare 310, and the diameter expansion direction of the flare 310 is along the outer surface direction of the pipe fitting 300. An insert 320 is also installed at the end of the pipe fitting 300 away from the connecting device 100. The insert 320 protrudes from the end surface of the pipe fitting 300, which can reduce the processing accuracy of the pipe fitting 300.

[0051] In this embodiment, the pipe fitting 300 includes an inner metal pipe fitting 300 and an outer plastic pipe fitting 300. The inner metal pipe fitting 300 is first welded to the insert 320, and then the plastic pipe fitting 300 is injection molded on the surface of the metal pipe fitting 300 by injection molding, thereby obtaining the pipe fitting 300 for connection with the steel-plastic composite pipe 200. Therefore, in order to reduce the precision control of the injection molding process, improve the production efficiency of the pipe fitting 300, and ensure product quality, the insert 320 protrudes from the end face of the pipe fitting 300.

[0052] This embodiment provides a steel-plastic composite connecting pipe 1000, and its installation process and principle are as follows:

[0053] First, the steel-plastic composite pipe 200 and pipe fitting 300 are respectively inserted into the surfaces of the two insertion portions 111 of the connecting device 100. The guide bend 123 guides the steel-plastic composite pipe 200 and pipe fitting 300. The flared opening 310 on the inner surface of the pipe fitting 300 also assists in inserting the pipe fitting 300 into the surface of the insertion portion 111. The steel-plastic composite pipe 200 and pipe fitting 300 are respectively passed through the guide bend 123, the spigot end 122, and the blocking portion 121, and finally locked between the stop portion 112 and the blocking portion 121, completing the installation.

[0054] Due to the presence of blocking portion 121, connection device 100 will not shift regardless of changes in the pressure within the pipeline. Therefore, connection device 100 stably seals the connection and the material, preventing bulging, steel-plastic separation, and other phenomena in steel-plastic composite pipeline 200. Furthermore, the large sealing area of ​​shaped sealing ring 120 not only ensures a stable seal, but also reduces installation difficulty through its rational structural design.

[0055] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. Industrial Applicability

[0056] The connection device for steel-plastic composite pipes and the steel-plastic composite connecting pipes provided by the present disclosure are used to insert steel-plastic composite pipes and pipe fittings by setting an insertion portion, and the steel-plastic composite pipes and pipe fittings are separated by a limiting portion to ensure that the steel-plastic composite pipes and pipe fittings are sufficiently inserted, so that the ends of the steel-plastic composite pipes are separated from the water, thereby avoiding the risk of failure of the steel-plastic composite pipes when exposed to water. In addition, the blocking portion and the limiting portion of the special-shaped sealing ring of the insertion portion are spaced apart, which can be used to clamp the steel-plastic composite pipes and pipe fittings for limiting, and the diameter of the special-shaped sealing ring is larger the closer to the limiting portion. When the water pressure is high, the setting of the blocking portion can avoid the displacement of the steel-plastic composite pipes and pipe fittings, effectively preventing the problems of bulging of the steel-plastic composite pipes and separation of steel and plastic; at the same time, the change in the diameter of the special-shaped sealing ring can also make the insertion of the steel-plastic composite pipes and pipe fittings easier, reducing the difficulty of connecting the steel-plastic composite pipes.

Claims

1. A connecting device for steel-plastic composite pipes, characterized in that: It includes a core body, a channel for transferring materials is formed inside the core body, the core body includes an insertion part and a limiting part, the limiting part is located between two adjacent insertion parts, and the outer diameter of the limiting part is larger than the outer diameter of the insertion part; the outer surface of the insertion part is covered with a special-shaped sealing ring, and the special-shaped sealing ring includes a blocking part, the diameter of the blocking part increases successively along the direction from the insertion part to the limiting part, and the blocking part and the limiting part are arranged at a distance.

2. The connecting device according to claim 1, characterized in that The special-shaped sealing ring further comprises a socket end, which is located at an end away from the limiting portion of the core body. The socket end is an arc-shaped structure and is connected to an end with a small diameter of the blocking portion.

3. The connecting device according to claim 2, characterized in that The arc diameter of the socket end is 1 to 3 mm, and the height of the blocking portion is smaller than the height of the socket end.

4. The connecting device according to claim 1, characterized in that The length of each of the insertion portions is 0.35 to 0.45 times the length of the core body.

5. The connection device according to claim 1, characterized in that A guide bend is provided at one end of each insertion portion of the core body away from the limiting portion, the bending direction of the guide bend is along the outer surface direction of the core body, and the height of the guide bend is less than the height of the blocking portion of the special-shaped sealing ring.

6. A steel-plastic composite connecting pipe, characterized in that: It comprises a steel-plastic composite pipe, a pipe fitting and a connecting device as claimed in any one of claims 1 to 5; the steel-plastic composite pipe and the pipe fitting are respectively sleeved on two adjacent insertion parts of the connecting device, and the limiting part separates the steel-plastic composite pipe and the pipe fitting.

7. The steel-plastic composite connecting pipe according to claim 6, characterized in that: The inner surface of one end of the pipe used for connecting with the connecting device is provided with a flare, and the diameter expansion direction of the flare is along the outer surface direction of the pipe.

8. The steel-plastic composite connecting pipe according to claim 6 or 7, characterized in that: An insert is further installed on one end of the pipe away from the connecting device, and the insert protrudes from the end surface of the pipe.

9. The steel-plastic composite connecting pipe according to claim 6, characterized in that: The pipe fittings include any one of straight, elbow or tee.

10. The steel-plastic composite connecting pipe according to claim 6, characterized in that: The pipe fittings include inner metal pipe fittings and outer plastic pipe fittings.

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