Reducing pipe fitting connector and reducing energy conveying pipeline

Abstract

The utility model relates to the technical field of energy transportation, in particular to a reducing pipe fitting connector and a reducing energy conveying pipeline, the reducing pipe fitting connector comprises a main body and a first connecting part, the main body is provided with a communicating pipeline, the communicating pipeline is used for being detachably communicated with a small-caliber pipeline, and the first connecting part is provided with a second connecting part; the first connecting part is used for enabling the different-diameter pipeline joint to be detachably communicated with a large-diameter pipeline; through the matching effect of all the components, the reducing pipe fitting connector is detachably connected with the large-diameter pipeline and the small-diameter pipeline, and the reducing pipe fitting connector is detachably arranged, so that the pipelines with overlarge diameter difference can be connected more conveniently, and the connecting efficiency of the reducing pipe fitting connector is improved. And the reducing pipe fitting joint has the reusability while saving the assembly space.

Description

Technical Field

[0001] The utility model relates to the technical field of energy transportation, and particularly relates to a reducing pipe fitting joint and a reducing energy transmission pipeline. Background Art

[0002] With the rapid development of industrialization and urbanization, whether it is the daily domestic water and electricity consumption of residents or the energy transportation required in fields such as metallurgy and chemical industry, it is inseparable from the energy medium pipeline. At present, the energy medium pipeline transportation system in China is quite perfect, with a total length reaching tens of thousands of kilometers, connecting major cities and important industrial bases. However, due to different requirements for transportation pipelines of different energy media in different regions or countries, in the energy medium pipeline transportation system, the connection between pipelines often requires diameter-changing treatment. Therefore, the pipeline diameter-changing technology is a key link to ensure the safe, efficient, and smooth operation of the pipeline system. With the increasing energy demand and the continuous development of energy medium pipeline transportation technology, the requirements for technologies related to the connection and diameter-changing of energy medium pipelines are also getting higher and higher.

[0003] The traditional connection methods between energy medium pipelines with different diameters include flange connection, pipe thread connection, pipeline welding, adhesive connection, etc. For pipeline welding and adhesive connection, on the one hand, it has relatively high requirements for the technical ability of operators. On the other hand, if damage occurs or pipe fittings need to be replaced in subsequent work, it is more difficult to repair or replace parts for pipelines connected by welding or adhesive connection. For flange connection and pipe thread connection, their single use cannot adapt to two pipelines with a large difference in pipe diameter. If two pipelines with a large difference in pipe diameter need to be connected, it is often necessary to first connect a connecting pipeline to the large-diameter pipeline through flange connection, and then connect it to the small-diameter pipeline through pipe thread connection at the other end of the connecting pipeline for diameter-changing connection. This process is very troublesome, and due to the large number of configuration parts and tools required for flange connection and pipe thread connection, the installation time is long, seriously affecting the efficiency of maintenance or installation.

[0004] Based on the above problems, this application proposes a reducing pipe fitting joint. The reducing pipe fitting joint has a simple structure, a simple manufacturing process, a low product cost, and is convenient and fast to install, making the assembly of reducing pipelines in the energy medium pipeline piping more simple and efficient. At the same time, the reducing pipe fitting joint has the characteristic of reusable, reducing the cost of energy medium pipeline transportation and improving economic benefits. Content of the Utility Model

[0005] To achieve the above object, the utility model is realized through the following technical solutions: The utility model proposes a reducing pipe fitting joint, including: a main body and a first connecting portion;

[0006] A through conveying passage is provided in the main body along its axial direction;

[0007] The first connecting portion is disposed on the first end of the main body; the first connecting portion is used for connecting with a large-diameter pipeline;

[0008] The first end of the main body has a communicating pipeline, and the communicating pipeline is used for communicating the main body with a small-diameter pipeline;

[0009] The middle portion of the first connecting portion in its axial direction has a through hole, and the communicating pipeline passes through the through hole;

[0010] The inner diameter of the inner passage of the small-diameter pipeline is smaller than the inner diameter of the inner passage of the large-diameter pipeline;

[0011] The maximum diameter of the first connecting portion in its axial direction is greater than the maximum diameter of the main body in its axial direction;

[0012] The maximum diameter of the main body in its axial direction is greater than the inner diameter of the through hole;

[0013] The outer diameter of the communicating pipeline is smaller than the inner diameter of the through hole.

[0014] Preferably, the central axes of the main body, the communicating pipeline and the first connecting portion are collinear.

[0015] Preferably, the first connecting portion is provided with a first connecting hole and a second connecting hole;

[0016] There are at least two first connecting holes, and each of the first connecting holes is uniformly arranged around the first connecting portion;

[0017] There are at least two second connecting holes, and each of the second connecting holes is uniformly arranged around the first connecting portion;

[0018] The distance from each of the second connecting holes to the central axis of the first connecting portion is greater than the distance from each of the first connecting holes to the central axis of the first connecting portion.

[0019] Preferably, the main body is provided with a connecting groove, the connecting groove is disposed on the first end of the main body, there are at least two connecting grooves, and the connecting grooves are oppositely arranged with the first connecting holes.

[0020] Preferably, a calibration member is provided at the connection between the communicating pipeline and the main body;

[0021] The calibration member is disposed around the outer surface of the communicating pipeline;

[0022] The calibration member is provided with a reduced diameter structure towards the first end direction of the communicating pipeline;

[0023] The maximum diameter of the calibration member in the axial direction of the communicating pipeline is smaller than the inner diameter of the through hole.

[0024] Preferably, the diameter of the opening of the conveying passage at the first end of the main body is not greater than the diameter of the opening of the conveying passage at the second end of the main body.

[0025] In addition, the present application also provides a reducing energy conveying pipeline, which includes a reducing pipe fitting joint as described in any one of the above, a large-diameter pipe, and a small-diameter pipe;

[0026] The large-diameter pipe is communicated with the small-diameter pipe through the reducing pipe fitting joint.

[0027] Preferably, the outer wall of the opening at the second end of the small-diameter pipe is threaded, and / or the inner wall of the opening at the second end of the small-diameter pipe is threaded.

[0028] Preferably, the large-diameter pipe further includes a second connecting portion, which is arranged between the first end of the large-diameter pipe and the second end of the main body, and the second connecting portion is used to make the large-diameter pipe and the main body be hermetically communicated.

[0029] Preferably, a third connecting hole opposite to the second connecting hole is arranged on the second connecting portion;

[0030] The first connecting portion and the second connecting portion are connected through the second connecting hole and the third connecting hole, so that the reducing energy joint is connected to the large-diameter pipe.

[0031] It can be seen from the above technical solutions that the present utility model has the following advantages:

[0032] In the present utility model, a reducing pipe fitting joint is provided. The reducing pipe fitting joint includes a main body and a first connecting portion. A through conveying passage is provided in the main body along its axial direction. The first connecting portion is disposed at the first end of the main body. The first connecting portion is used for connecting with a large-diameter pipe. The first end of the main body has a communicating pipe, and the communicating pipe is used for communicating the main body with a small-diameter pipe. A through hole is provided in the middle of the first connecting portion along its axial direction, and the communicating pipe passes through the through hole. The inner diameter of the inner passage of the small-diameter pipe is smaller than that of the inner passage of the large-diameter pipe. The maximum diameter of the first connecting portion along its axial direction is larger than the maximum diameter of the main body along its axial direction. The maximum diameter of the main body along its axial direction is larger than the inner diameter of the through hole. The outer diameter of the communicating pipe is smaller than the inner diameter of the through hole. Through the cooperation of the above components, the reducing pipe fitting joint variably connects the large-diameter pipe and the small-diameter pipe, and the second connecting portion is detachably connected to the first connecting portion, and the second connecting portion is also detachably connected to the large-diameter pipe, so that the reducing pipe fitting joint can be detachably connected to the large-diameter pipe, and the energy pipe with a small diameter can be detachably connected through the communicating pipe. The first connecting portion and the communicating pipe are both disposed at the same end of the main body, so that the entire reducing pipe fitting joint can be detachably arranged, thereby more conveniently connecting pipes with a large diameter difference. In addition, it also enables the reducing pipe fitting joint to have reusability while achieving a closer fit, saving assembly space and greatly improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 is a schematic assembly structure diagram of a reducing pipe fitting joint and a large-diameter pipe in some embodiments of the present application;

[0035] Figure 2 is an exploded structure diagram of a reducing pipe fitting joint in some embodiments of the present application.

[0036] Wherein the reference numerals are:

[0037] 1 - main body; 2 - communicating pipe; 3 - first connecting portion; 4 - second connecting portion; 5 - through hole; 6 - conveying passage; 7 - calibration piece; 8 - first connecting hole; 9 - second connecting hole; 10 - connecting groove; 11 - third connecting hole; 12 - large-diameter pipe. Detailed implementation manners

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] As used in the present invention, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more", in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features. The term "proximal end" is usually the end close to the operator, the term "distal end" is usually the end far from the operator, "one end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which include not only the endpoints. The terms "mounted", "connected", "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. In addition, as used in the present invention, when an element is disposed on another element, it generally only means that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the two elements may be directly or indirectly connected, coupled, cooperated or transmitted through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, an element may be inside, outside, above, below or on one side of another element in any orientation, unless otherwise clearly specified in the content. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] Please refer to Figure 1 as shown Figure 1Schematic diagram of the assembly structure of a reducing pipe fitting joint and a large-diameter pipe according to some embodiments of the present application. In this embodiment, the reducing pipe fitting joint includes: a main body 1 and a first connecting portion 3; a through conveying passage 6 is provided in the main body 1 along its axial direction; the first connecting portion 3 is provided at the first end of the main body 1; the first end of the main body 1 has a communicating pipe 2, and the first end of the main body 1 is the end of the main body facing the small-diameter pipe; the communicating pipe 2 is used to connect the main body 1 and the small-diameter pipe; the first connecting portion 3 is used to connect with the large-diameter pipe 12; a through hole 5 is provided in the middle of the first connecting portion 3 along its axial direction, and the communicating pipe 2 passes through the through hole 5; the inner diameter of the inner passage of the small-diameter pipe is smaller than the inner diameter of the inner passage of the large-diameter pipe 12; the diameter of the opening of the conveying passage 6 at the first end of the main body 1 is not greater than the diameter of the opening of the conveying passage 6 at the second end of the main body 1, and the maximum diameter of the first connecting portion 3 along its axial direction is greater than the maximum diameter of the main body 1 along its axial direction; the maximum diameter of the main body 1 along its axial direction is greater than the inner diameter of the through hole 5; the outer diameter of the communicating pipe 2 is smaller than the inner diameter of the through hole 5. In addition, the central axes of the main body 1, the communicating pipe 2, and the first connecting portion 3 are collinear.

[0041] It should be noted that the conveying passage 6 can be of equal diameter or variable diameter, that is, the diameters of the openings at both ends of the conveying passage 6 can be equal. In addition, the diameter of the opening of the conveying passage 6 near the large-diameter pipe 12 can also be greater than the diameter of the opening of the conveying passage 6 near the small-diameter pipe, and the diameter of the opening of the conveying passage 6 near the large-diameter pipe 12 is matched with the diameter of the opening of the large-diameter pipe 12 at the contact end, and the diameter of the opening of the conveying passage 6 near the small-diameter pipe is matched with the diameter of the opening of the small-diameter pipe at the contact end. The above settings are all prior arts, and the present application does not make too many limitations here.

[0042] In this embodiment, the first connecting portion 3 is specifically a pressing flange. The materials of the main body 1 and the first connecting portion 3 include carbon steel, alloy steel, stainless steel, copper, ceramics, etc. The specific materials of the main body 1 and the first connecting portion 3 depend on the different properties of the energy medium conveyed by the pipeline. When the energy medium conveyed by the pipeline is corrosive, the materials of the main body 1 and the first connecting portion 3 can be stainless steel at this time. When the temperature of the energy medium conveyed by the pipeline is relatively high, the materials of the main body 1 and the pressing flange can be alloy steel at this time. The above are all prior arts, and operators in this field can make corresponding adjustments according to different working conditions. The present application does not make too many limitations here.

[0043] Please refer to Figure 2 as shownFigure 2 Explosion structure schematic diagram of a reducing pipe fitting joint for some embodiments of the present application. In this embodiment, a calibration member 7 is provided at the connection between the communication pipe 2 and the main body 1; the calibration member 7 is disposed around the outer surface of the communication pipe 2; the calibration member 7 is provided with a reduced diameter structure towards the first end direction of the communication pipe 2; the maximum diameter of the calibration member 7 in the axial direction of the communication pipe 2 is smaller than the inner diameter of the through hole 5.

[0044] In this embodiment, the calibration member 7 is used to smoothly connect the main body 1 and the first connection portion 3, and the calibration member 11 is specifically disposed on one side of the communication pipe 2 close to the first end of the main body 1. When actually using the reducing pipe fitting joint, the reducing pipe fitting joint may rust due to environmental influence, resulting in difficulty in installing or disassembling the first connection portion 3 on the first end of the main body 1. Therefore, a certain assembly tolerance needs to be additionally set between the first connection portion 3 and the calibration member 11. The assembly tolerance is specifically 0.01 - 0.1 mm, that is, the difference between the maximum diameter of the calibration member 7 in the axial direction of the communication pipe 2 and the inner diameter of the through hole 5 is between 0.01 mm and 0.1 mm.

[0045] In addition, the calibration member 7 is provided with a reduced diameter structure towards the first end direction of the communication pipe 2, which is used to enable the operators in the art to conveniently and quickly install and disassemble the main body 1 and the first connection portion 3. The reduced diameter structure is specifically manifested as: the calibration member 7 has a certain preset angle in the axial direction of the communication pipe 2, and the preset angle is specifically three degrees. In other alternative embodiments, the preset angle may specifically be five degrees. When the size of the through hole 5 of the first connection portion 3 is different, the operators in the art can adjust the preset angle so that the main body 1 can be aligned with and pass through the through hole 5 through the calibration member 7, thereby connecting the main body 1 and the first connection portion 3. Therefore, the present application does not limit the specific data of the preset angle too much.

[0046] Please refer to Figure 1 and Figure 2As shown, in this embodiment, a first connection hole 8 and a second connection hole 9 are provided on the first connection part 3; there are at least two first connection holes 8, and each of the first connection holes 8 is evenly distributed around the first connection part 3; there are at least two second connection holes 9, and each of the second connection holes 9 is evenly distributed around the first connection part 3; the distance from each of the second connection holes 9 to the central axis of the first connection part 3 is greater than the distance from each of the first connection holes 8 to the central axis of the first connection part 3. A connection groove 10 is provided on the main body 1, and the connection groove 10 is provided at the first end of the main body 1. There are at least two connection grooves 10, and the connection grooves 10 are arranged opposite to the first connection holes 8. The first connection hole 8 and the connection groove 10 can be connected by bolts. The bolts pass through the first connection hole 8 and at least partially extend into and are fixed in the connection groove 10, so as to realize the fixed connection between the first connection part 3 and the main body 1.

[0047] In addition, when the specific number of the first connection holes 8 is four, the specific number of the connection grooves 10 is correspondingly four at this time, and the central angle between two adjacent first connection holes 8 or two adjacent connection grooves 10 is 90 degrees at this time; when the specific number of the connection holes 9 is eight, the specific number of the connection grooves 8 is correspondingly eight at this time, and the central angle between two adjacent first connection holes 8 or two adjacent connection grooves 10 is 45 degrees at this time; the above are all prior arts, and operators in this field can adjust the number or distribution of the first connection holes 8 and the connection grooves 10 according to different working conditions, and the present application does not make too many limitations here.

[0048] In this application, a stepped energy transmission pipeline is also proposed. The stepped energy transmission pipeline includes the above-mentioned stepped pipe fitting joint, the large-diameter pipeline 12 and the small-diameter pipeline; the large-diameter pipeline 12 is communicated with the small-diameter pipeline through the stepped pipe fitting joint.

[0049] Please refer to Figure 2As shown, the large-diameter pipe 12 further includes a second connection part 4. The second connection part 4 is arranged between the first end of the large-diameter pipe 12 and the second end of the main body 1. The second connection part 4 is used to connect the large-diameter pipe 12 and the main body 1. Specifically: a third connection hole 11 opposite to the second connection hole 9 is arranged on the second connection part 4, and the second connection hole 9 and the third connection hole 11 are fixedly connected by a connection plug adapted thereto; the first connection part 3 and the second connection part 4 are fixedly connected by the connection plug passing through and fixing the second connection hole 9 and the third connection hole 11, so as to connect the reduced-diameter energy connector with the large-diameter pipe 12. In addition, a communication through hole for communicating the large-diameter pipe 12 with the conveying passage 6 is provided in the middle of the second connection part 4 along its axial direction, and the diameter size of the communication through hole is between the diameter of the opening at one end of the large-diameter pipe 12 facing the small-diameter pipe and the diameter of the opening at the second end of the main body 1.

[0050] In addition, a gasket may be provided between the reduced-diameter pipe fitting connector and the large-diameter pipe 12, specifically between the main body 1 and the second connection part 4. The gasket is used to completely seal the gap between the main body 1 and the second connection part 4 when they are connected, so as to achieve the best airtight effect and prevent the leakage of energy medium. The gasket is specifically placed around the first end of the second connection part 4. The gasket may be made of non-metal or semi-metal. When the gasket is made of non-metal material, it is specifically made of non-metal materials such as asbestos, rubber, and synthetic resin; when the gasket is made of semi-metal material, the gasket is specifically made by synthesizing materials such as copper, iron, asbestos, and rubber. During the actual transportation of energy medium, different types of gaskets are selected according to the different properties of the energy medium to achieve the best sealing effect. The above are all prior arts, and the present application does not make too many limitations here.

[0051] In the present application, the connection plug may be a bolt or a pin; the second connection part 4 is specifically a pipe flange, and the material of the pipe flange includes carbon steel, alloy steel, stainless steel, copper, ceramic, etc. The specific material of the second connection part 4 depends on the different properties of the energy medium transported by the pipeline. When the energy medium transported by the pipeline is corrosive, the material of the second connection part 4 may be stainless steel at this time. When the temperature of the energy medium transported by the pipeline is relatively high, the material of the second connection part 4 may be alloy steel at this time. The above are all prior arts, and the operators in this field can make corresponding adjustments according to different working conditions. The present application does not make too many limitations here.

[0052] In the present application, the reduced-diameter energy transmission pipeline further includes a small-diameter pipeline. The outer wall or the inner wall at the opening of the second end of the small-diameter pipeline may be threaded. The small-diameter pipeline is specifically threadedly connected to the first end of the connecting pipeline. The first end of the connecting pipeline is its first end facing the small-diameter pipeline, and at the same time, it is also the first end of the main body 1. The second end of the small-diameter pipeline is its end facing the main body 1 and the large-diameter pipeline 12. When the outer wall of the small-diameter pipeline is threaded, the inner wall at the opening of the first end of the connecting pipeline 2 is provided with threads, and the inner diameter of the opening at the first end of the connecting pipeline 2 is larger than the outer diameter of the opening at the second end of the small-diameter pipeline. When the inner wall of the small-diameter pipeline is threaded, the outer wall at the opening of the first end of the connecting pipeline 2 is provided with threads, and the outer diameter of the opening at the first end of the connecting pipeline 2 is smaller than the inner diameter of the opening at the second end of the small-diameter pipeline. Through the above settings, the connecting pipeline 2 can be hermetically and detachably connected to the small-diameter pipeline in a matching manner and smoothly.

[0053] In addition, the outer wall and the inner wall of the first end of the connecting pipeline 2 can be simultaneously provided with threads, so that the connecting pipeline 2 can be connected to a small-diameter pipeline with a threaded outer wall or a small-diameter pipeline with a threaded inner wall at the same time, thereby improving the adaptability of the connecting pipeline 2. Operators in the art can adopt different setting forms of the connecting pipeline 2 according to different working conditions. The above settings are all prior arts, and the present application does not make excessive limitations here.

[0054] In summary, in the present utility model, a reducing pipe fitting joint is proposed. The reducing pipe fitting joint includes a main body 1 and a first connecting portion 3. A through conveying passage 6 is provided in the main body 1 along its axial direction. The first connecting portion 3 is disposed at the first end of the main body 1. The first connecting portion 3 is used for connecting with a large-diameter pipe 12. A communicating pipe 2 is provided at the first end of the main body 1, and the communicating pipe 2 is used for communicating the main body 1 with a small-diameter pipe. A through hole 5 is provided in the middle of the first connecting portion 3 along its axial direction, and the communicating pipe 2 passes through the through hole 5. The inner diameter of the inner passage of the small-diameter pipe is smaller than the inner diameter of the inner passage of the large-diameter pipe 12. The maximum diameter of the first connecting portion 3 along its axial direction is greater than the maximum diameter of the main body 1 along its axial direction. The maximum diameter of the main body 1 along its axial direction is greater than the inner diameter of the through hole 5. The outer diameter of the communicating pipe 2 is smaller than the inner diameter of the through hole 5. In addition, the present application also proposes a reducing energy transmission pipeline, which includes a reducing pipe fitting joint, a large-diameter pipe, and a small-diameter pipe. The reducing pipe fitting joint is applied to the reducing energy transmission pipeline. Through the cooperative setting of the above components, the system solves the problem that when connecting a traditional large-diameter pipe and a small-diameter pipe, it is impossible to perform detachable connection or a large number of components are required for connection. The reducing pipe fitting joint reduces the diameter to connect the large-diameter pipe and the small-diameter pipe, and the first connecting portion is detachably connected to the second connecting portion, and the second connecting portion is also detachably connected to the large-diameter pipe, so that the reducing pipe fitting joint can be detachably connected to the large-diameter pipe, and the communicating pipe is detachably connected to the small-diameter energy pipeline. The first connecting portion and the communicating pipe are both disposed at the same end of the main body, so as to realize the detachable setting of the entire reducing pipe fitting joint, so as to more conveniently connect pipes with too large a diameter difference. In addition, it also enables the reducing pipe fitting joint to have reusability while achieving a closer fit, saving assembly space and greatly improving economic benefits.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A reducing pipe fitting joint, characterized in that: Comprising: A main body and a first connecting portion; A through conveying passage runs through the main body along its axial direction; The first connecting portion is disposed at the first end of the main body; the first connecting portion is used for connecting with a large-diameter pipeline; The first end of the main body has a communicating pipeline, and the communicating pipeline is used for communicating the main body with a small-diameter pipeline; A through hole runs through the middle of the first connecting portion along its axial direction, and the communicating pipeline passes through the through hole; The inner diameter of the inner passage of the small-diameter pipeline is smaller than the inner diameter of the inner passage of the large-diameter pipeline; The maximum diameter of the first connecting portion along its axial direction is greater than the maximum diameter of the main body along its axial direction; The maximum diameter of the main body along its axial direction is greater than the inner diameter of the through hole; The outer diameter of the communicating pipeline is smaller than the inner diameter of the through hole.

2. The reducing pipe fitting joint according to claim 1, wherein: The central axes of the main body, the communicating pipeline and the first connecting portion are collinear.

3. The reducing pipe fitting joint according to claim 1, characterized in that: The first connecting portion is provided with a first connecting hole and a second connecting hole; There are at least two first connecting holes, and each of the first connecting holes is evenly distributed around the first connecting portion; There are at least two second connecting holes, and each of the second connecting holes is evenly distributed around the first connecting portion; The distance of each of the second connecting holes from the central axis of the first connecting portion is greater than the distance of each of the first connecting holes from the central axis of the first connecting portion.

4. The reducing pipe fitting joint according to claim 3, wherein: The main body is provided with a connecting groove, the connecting groove is disposed at the first end of the main body, there are at least two connecting grooves, and the connecting grooves are oppositely arranged with the first connecting holes.

5. The reducing pipe fitting joint according to claim 1, characterized in that: A calibration member is provided at the connection between the communicating pipeline and the main body; The calibration member is disposed around the outer surface of the communicating pipeline; The calibration member is arranged in a necking structure towards the first end direction of the communicating pipeline; The maximum diameter of the calibration member along the axial direction of the communicating pipeline is smaller than the inner diameter of the through hole.

6. The reducing pipe fitting joint according to claim 1, characterized in that: The inner diameter of the opening of the conveying passage at the first end of the main body is not greater than the inner diameter of the opening of the conveying passage at the second end of the main body.

7. A reduced-diameter energy transmission pipeline, characterized in that: The stepped energy conveying pipeline includes the stepped pipe fitting joint as described in any one of claims 1-6, a large-diameter pipeline and a small-diameter pipeline; The large-diameter pipeline is communicated with the small-diameter pipeline through the stepped pipe fitting joint.

8. The stepped energy transmission pipeline according to claim 7, wherein: The outer wall of the opening at the second end of the small-diameter pipeline is threaded, and / or, the inner wall of the opening at the second end of the small-diameter pipeline is threaded.

9. The stepped energy transmission pipeline according to claim 7, characterized in that: The large-diameter pipeline further includes a second connecting portion, the second connecting portion is disposed between the first end of the large-diameter pipeline and the second end of the main body, and the second connecting portion is used for making the large-diameter pipeline and the main body be hermetically communicated.

10. The reduced-diameter energy transmission pipeline according to claim 9, characterized in that: The second connecting portion is provided with a third connecting hole opposite to the second connecting hole; The first connecting portion and the second connecting portion are connected through the second connecting hole and the third connecting hole, so that the stepped pipe fitting joint is connected with the large-diameter pipeline.

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