Nodular cast iron pipe and steel pipe conversion connecting piece for heat supply pipe network

Abstract

The utility model discloses a spheroidal graphite cast iron pipe and steel pipe conversion connecting piece for a heat supply pipe network, which belongs to the field of spheroidal graphite cast iron pipe and steel pipe socket connection conversion structures and comprises a pipe body, a heat preservation layer arranged on the outer side of the pipe body and an outer protection pipe arranged on the outer side of the heat preservation layer. One end of the pipe body is provided with a first bellmouth matched with a nodular cast iron pipe in size, and the other end of the pipe body is provided with a second bellmouth matched with a steel pipe in size; a thrust ring is arranged in the middle of the pipe body; and the size of the tube body is in a gradual change mode. Connection of the nodular cast iron pipe and the steel pipe can be achieved, thermal stress caused by heating of a heat supply pipeline can be reduced, the whole pipeline is in a low-stress state, and safe operation of the heat supply pipeline is guaranteed. And the structure is simple, installation is convenient, the construction period is shortened, and the device is suitable for conversion connection of nodular cast iron pipes and steel pipes with various calibers.

Description

Technical Field

[0001] The utility model relates to the field of socket-and-spigot connection conversion structures of ductile iron pipes and steel pipes, in particular to a ductile iron pipe and steel pipe conversion connector for a heating pipe network. Background Art

[0002] At present, ductile iron pipes are gradually used in heating pipe networks. When connecting with traditional steel pipes of heating network pipes, the usual practice is to make a machined part, one end of which is consistent with the outer diameter of the steel pipe and welded to the steel pipe, and the other end is consistent with the outer diameter of the ductile iron pipe, and then a socket is used for socket connection. The processing of the machined part is complicated, and the conversion requires two pipe fittings, which affects the construction period, and there is a problem of eliminating thermal stress at the conversion.

[0003] Therefore, it is necessary to develop a ductile iron pipe and steel pipe conversion connector for a heating network 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 and steel pipe conversion connector for a heating pipe network, which has a simple structure, can be mass-produced, is easy to install, has a built-in thrust ring, and is suitable for the conversion of ductile iron pipes and steel pipes of various calibers.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A ductile iron pipe and steel pipe conversion connector for a heating pipe network comprises a pipe body, an insulation layer arranged on the outside of the pipe body and an outer protective pipe arranged on the outside of the insulation layer; a first socket matching the size of the ductile iron pipe is arranged at one end of the pipe body, and a second socket matching the size of the steel pipe is arranged at the other end of the pipe body; a thrust ring is arranged in the middle of the pipe body; the size of the pipe body is a gradual change pattern.

[0007] A further improvement of the technical solution of the utility model is that the height of the thrust ring is greater than the sum of the thicknesses of the thermal insulation layer and the outer protective tube.

[0008] A further improvement of the technical solution of the utility model is that after the steel pipe is installed, a fixing pier is further arranged on one side of the pipe body, and the thrust ring is fixedly connected to the fixing pier.

[0009] A further improvement of the technical solution of the utility model is that the effective length L1 of the tube body is greater than the elongation of the steel tube side after being heated.

[0010] A further improvement of the technical solution of the utility model is that the pipe body, the first socket, the second socket and the thrust ring are cast as one piece.

[0011] A further improvement of the technical solution of the utility model is that the size of the first socket is larger than the size of the second socket.

[0012] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0013] 1. The utility model provides a ductile iron pipe and steel pipe conversion connector for a heating pipe network, which has a large axial expansion and contraction amount and radial deflection angle. One side of the connector is connected to the ductile iron pipe with a socket, and the other side is connected to the steel pipe with a socket, which meets the requirement of prohibiting flange connection in the heating pipe network. After the pipeline is installed, the axial expansion and contraction amount of the connector can absorb the elongation of the steel pipe side after heating. Compared with the traditional pure steel pipe heating pipeline, the mixed use of ductile iron pipe and steel pipe can reduce the thermal stress of the heating pipeline caused by heating, so that the pipeline as a whole is in a low stress state, ensuring the safe operation of the heating pipeline.

[0014] 2. The utility model provides a ductile iron pipe and steel pipe conversion connector for a heating pipe network, which has a simple structure, is easy to install, saves construction period, and can be applied to the conversion connection of ductile iron pipes and steel pipes of various calibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the structure of a ductile iron pipe and steel pipe conversion connector for a heating pipe network provided in an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of a ductile iron pipe and steel pipe conversion connector for a heating pipe network provided in an embodiment of the utility model after installation;

[0018] Figure 3 It is a schematic diagram of the arrangement of the fixed pier in the embodiment of the utility model;

[0019] Among them, 1. first socket; 2. pipe body; 3. thrust ring; 4. insulation layer; 5. outer protective pipe; 6. second socket; 7. ductile iron pipe; 8. steel pipe; 9. fixed pier. DETAILED DESCRIPTION

[0020] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0024] like Figure 1-3 As shown, a ductile iron pipe and steel pipe conversion connector for a heating pipe network includes a pipe body 2, an insulation layer 4 arranged on the outside of the pipe body 2, and an outer protective pipe 5 arranged on the outside of the insulation layer 4; a first socket 1 matching the size of the ductile iron pipe 7 is arranged at one end of the pipe body 2, and a second socket 6 matching the size of the steel pipe 8 is arranged at the other end of the pipe body 2 to achieve a socket connection and a sealing function; a thrust ring 3 is arranged in the middle of the pipe body 2, and the thickness of the thrust ring 3 needs to meet the strength requirement of resisting thermal stress; the size of the pipe body 2 is a gradual change mode, and the variable diameter size of the pipe body 2 is determined according to the sizes of the first socket 1 and the second socket 6, respectively.

[0025] Specifically, the insulation layer 4 is wrapped around the outside of the pipe body 2. The insulation layer 4 can be prefabricated in a workshop or made at a construction site. The materials used can be various insulation materials (polyurethane foam, insulation cotton, aerogel felt, etc.), and the thickness must meet the insulation requirements; the outer protective tube 5 can be a PE tube or a rubber belt with waterproof function, etc., usually made of PE material or rubber material to ensure waterproof and sealing performance.

[0026] Furthermore, the height of the thrust ring 3 is greater than the sum of the thicknesses of the thermal insulation layer 4 and the outer protective tube 5 , which facilitates the later installation of the fixing pier 9 .

[0027] Furthermore, after the steel pipe 8 is installed, a fixed pier 9 is provided on one side of the pipe body 2, and the thrust ring 3 is fixedly connected to the fixed pier 9. The fixed pier 9 is generally set as a concrete pier, and its main function is to fix the thrust ring 3 to resist the thrust generated on the connecting piece after the steel pipe 8 side expands due to heat.

[0028] Furthermore, the effective length L1 of the pipe body 2 is greater than the elongation of the steel pipe 8 after being heated, so as to reduce the thermal stress level of the pipeline.

[0029] Furthermore, the pipe body 2, the first socket 1, the second socket 6 and the thrust ring 3 are integrally cast, and the material may be a ductile iron pipe or other metals that are easy to process and manufacture.

[0030] Furthermore, the size of the first socket 1 is larger than that of the second socket 6, so as to facilitate connection of the ductile iron pipe 7 at one end and the steel pipe 8 at the other end.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A ductile iron pipe and steel pipe conversion connector for a heating pipe network, characterized in that: The invention comprises a pipe body (2), a heat-insulating layer (4) arranged outside the pipe body (2), and an outer protective pipe (5) arranged outside the heat-insulating layer (4); a first socket (1) matching the size of a ductile iron pipe (7) is arranged at one end of the pipe body (2), and a second socket (6) matching the size of a steel pipe (8) is arranged at the other end of the pipe body (2); a thrust ring (3) is arranged in the middle of the pipe body (2); and the size of the pipe body (2) is in a gradual change mode.

2. A ductile iron pipe and steel pipe conversion connector for a heating pipe network according to claim 1, characterized in that: The height of the thrust ring (3) is greater than the sum of the thicknesses of the thermal insulation layer (4) and the outer protective tube (5).

3. The ductile iron pipe and steel pipe conversion connector for a heating pipe network according to claim 2, characterized in that: After the steel pipe (8) is installed, a fixing pier (9) is provided on one side of the pipe body (2), and the thrust ring (3) is fixedly connected to the fixing pier (9).

4. The ductile iron pipe and steel pipe conversion connector for a heating pipe network according to claim 3, characterized in that: The effective length L1 of the tube body (2) is greater than the elongation of the steel tube (8) side after being heated.

5. The ductile iron pipe and steel pipe conversion connector for a heating pipe network according to claim 1, characterized in that: The pipe body (2), the first socket (1), the second socket (6) and the thrust ring (3) are cast in one piece.

6. The ductile iron pipe and steel pipe conversion connector for a heating pipe network according to claim 1, characterized in that: The size of the first socket (1) is greater than the size of the second socket (6).

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