A new low-pressure methanol pipeline structure and process method

Abstract

The present application provides a novel low-pressure methanol pipeline structure and process method. The novel low-pressure methanol pipeline structure includes a common rail pipe and a supply pipe. The common rail pipe comprises an inner pipe and an outer pipe, each of which is coaxially sleeved and fixed by flanges at both ends. The inner pipe comprises a first inner pipe, an inner module, and a second inner pipe, which are sequentially connected. The inner module has a connection hole. The outer pipe comprises a connected integral outer pipe and two halves. The integral outer pipe covers the inner module, and the integral outer pipe has an outer pipe joint seat corresponding to the connection hole of the inner module. The supply pipe comprises a third inner pipe, an intermediate pipe, an outer pipe, and a threaded joint, which are sequentially sleeved from the inside to the outside. The end of the third inner pipe is exposed through the end of the outer pipe and at least partially connected to the connection hole to connect to the inner module. One end of the threaded joint is sleeved on the end of the outer pipe, and the other end is sleeved on the wall of the third inner pipe via a two-half ferrule. The outer pipe joint seat is sleeved on the end of the threaded joint.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a novel low-pressure methanol pipeline structure and process method. Background Art

[0002] As a crucial component of a methanol engine's methanol system, the design and assembly quality of the low-pressure methanol pipeline are directly linked to the engine's safety and reliability. Classification societies require that leakage of methanol, a flammable, explosive, toxic, and corrosive fuel, poses serious safety risks. Therefore, the design of the low-pressure methanol pipeline structure is crucial to the safety and reliability of methanol engines. Summary of the Invention

[0003] The embodiments of the present application provide a novel low-pressure methanol pipeline structure and process method.

[0004] In a first aspect, the present invention provides a novel low-pressure methanol pipeline structure, comprising a common rail pipe and a supply pipe; wherein:

[0005] The common rail pipe includes an inner layer pipe and an outer layer pipe which are coaxially sleeved and fixed at both ends by flanges. The inner layer pipe includes a first inner layer pipe, an inner layer module and a second inner layer pipe which are connected in sequence. The inner layer module is provided with a connecting hole which is used to connect the supply pipe. The outer layer pipe includes a connected integral outer pipe and two halves of the outer pipe. The integral outer pipe covers the inner layer module and at least part of the first inner layer pipe and the second inner layer pipe. The integral outer pipe is provided with an outer pipe joint seat corresponding to the connecting hole of the inner layer module.

[0006] The supply pipe includes a third inner layer pipe, an intermediate pipe, an outer layer pipe and a threaded joint which are sequentially sleeved from the inside to the outside. The intermediate pipe is located between the third inner layer pipe and the outer layer pipe, the end of the third inner layer pipe is exposed through the end of the outer layer pipe, and the end of the third inner layer pipe is at least partially connected to the connecting hole to connect with the inner layer module. One end of the threaded joint is sleeved on the end of the outer layer pipe, and the other end is sleeved on the pipe wall of the third inner layer pipe exposed through the end of the outer layer pipe through a two-half-type ferrule. The outer pipe joint seat is sleeved on the end of the threaded joint.

[0007] In some optional embodiments, the number of the supply pipes is two.

[0008] In some optional embodiments, the two supply pipes are connected to the same inner module.

[0009] In some optional embodiments, a first sealing ring is provided at the connection between the threaded joint and the outer tube, and a first ring groove is provided on the threaded joint corresponding to the first sealing ring.

[0010] In some optional embodiments, a second sealing ring is provided at the connection between the threaded joint and the outer pipe joint seat, and a second ring groove is provided on the threaded joint corresponding to the second sealing ring.

[0011] In some optional embodiments, at least two third sealing rings are axially provided at the connection between the third inner tube and the connecting hole, and the third inner tube is provided with a third ring groove corresponding to each third sealing ring.

[0012] In some optional embodiments, three welding holes are opened in the middle of the integral outer tube, and the inner layer module is welded to the integral outer tube through the three welding holes.

[0013] In some optional embodiments, the third inner tube and the two-half ferrules are correspondingly provided with circular arc grooves and circular arc protrusions.

[0014] In some optional embodiments, a circular groove is provided on one end face of the flange, and the circular groove has more than 10 holes for the circulation of the inner layer pipeline and the middle layer of the outer layer pipeline. The inner layer pipeline is inserted into the flange hole using double welds, and a boss is provided on the end of the flange for welding with the external pipeline.

[0015] In a second aspect, the embodiments of the present application provide a process method for a novel low-pressure methanol pipeline structure, including:

[0016] Providing a third inner tube, and sequentially sleeve an intermediate tube and an outer tube on the outer side of the third inner tube so that an end of the third inner tube is exposed through an end of the outer tube;

[0017] Bending the third inner tube and the outer tube together to form a tube;

[0018] Providing a threaded joint, inserting the threaded joint from the end of the third inner tube and moving it toward the outer tube, inserting a two-half ferrule, and then moving the threaded joint toward the end of the third inner tube so that one end of the threaded joint is sleeved on the end of the outer tube and the other end is sleeved through the two-half ferrule on the wall of the third inner tube exposed through the end of the outer tube, thereby forming a supply tube;

[0019] Welding the first inner layer tube, the inner layer module and the second inner layer tube to form an inner layer pipeline, wherein the inner layer module is provided with a connecting hole;

[0020] Welding a first flange to one end of the inner pipeline;

[0021] Radiographic inspection of the welds of the inner pipeline to see if they meet the requirements;

[0022] Sleeve the outer pipe over the inner pipe and weld it to the first flange;

[0023] The two-half outer pipe is sleeved on the inner pipe and welded to the integral outer pipe to form an outer pipe;

[0024] Welding a second flange to the other end of the outer layer pipeline and the inner layer pipeline;

[0025] Positioning the connecting hole and the outer tube joint seat by a step process rod, and welding the outer tube joint seat to the integral outer layer tube to form a common rail tube;

[0026] The end portion of the third inner layer pipe is at least partially connected to the connecting hole to communicate with the inner layer module, and the outer pipe joint seat is sleeved on the end portion of the threaded joint.

[0027] The above-mentioned embodiment of the present application designs a new type of low-pressure methanol pipeline structure, including a common rail pipe and a supply pipe with an inner and outer double-layer design. When there is methanol leakage in the inner pipe, it can be discovered in time through the detection of the middle layer to avoid safety problems; through this innovative double-wall structure, the operation of the methanol engine is safe and reliable; the structure is simple and has a certain error compensation capability, which improves the reliability of the pipeline operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0029] Figure 1 This is a structural schematic diagram of a novel low-pressure methanol pipeline structure according to an embodiment of the present application;

[0030] Figure 2 To correspond Figure 1 Schematic diagram of the cross-section structure;

[0031] Figure 3 To correspond Figure 2 Schematic diagram of the local structure in the middle dotted box;

[0032] Figure 4 Schematic diagram of the structure of the common rail pipe;

[0033] Figure 5 Schematic diagram of the partial cross-section structure of the common rail pipe;

[0034] Figure 6 It is the structural diagram of flange;

[0035] Figure 7 It is a partial structural diagram of the two-half outer tube;

[0036] Figure 8 Schematic diagram of the structure of the supply pipe;

[0037] Figure 9It is a partial perspective structural diagram of the supply pipe;

[0038] Figure 10 Schematic diagram of the local structure of the third inner layer tube;

[0039] Figure 11 Schematic diagram of the structure of the supply pipe end;

[0040] Figure 12 It is a structural diagram of a two-half ferrule;

[0041] Figure 13 This is a structural diagram of positioning the connecting hole and the outer pipe joint seat through the step process rod.

[0042] Explanation of symbols:

[0043] 11- Common rail pipe; 12- Supply pipe; 21- Integral outer pipe; 22- Two-half outer pipe; 23- First flange; 24- Second flange; 25- Welding hole; 26- First inner pipe; 27- Inner module; 28- Second inner pipe; 29- Outer pipe joint seat; 30- Connecting hole; 31- Third inner pipe; 32- Intermediate pipe; 33- Outer pipe; 34- Threaded joint; 35- Two-half ferrule; 36- First sealing ring; 37- Second sealing ring; 38- Third sealing ring; 39- Circular protrusion; 40- Circular groove; 41- Hole; 42- Boss; 43- Groove; 51- First Groove; 52- Second Groove; 53- Third Groove; 54- Step process rod. DETAILED DESCRIPTION

[0044] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0045] In the description of the embodiments of this application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] It should be noted that the terms "first, second, and third" in the embodiments of the present application are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understood that the terms "first, second, and third" can be interchanged to represent a specific order or precedence where permitted. It should be understood that the objects distinguished by "first, second, and third" can be interchanged where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0047] The present application embodiment provides a new low-pressure methanol pipeline structure, such as Figures 1 to 3 As shown, it includes: a common rail pipe 11 and a supply pipe 12.

[0048] like Figure 1 、 Figure 2 and Figure 4 As shown, the common rail pipe 11 includes an inner layer pipe and an outer layer pipe 33 which are coaxially sleeved and fixed by flanges at both ends. The flanges at both ends include a first flange 23 and a second flange 24. The inner layer pipe includes a first inner layer pipe 26, an inner layer module 27 and a second inner layer pipe 28 which are connected in sequence. The inner layer module 27 is provided with a connecting hole 30, and the connecting hole 30 is used to connect the supply pipe 12. The outer layer pipe 33 includes a connected integral outer pipe 21 and two half outer pipes 22. The integral outer pipe 21 covers the inner layer module 27 and at least part of the first inner layer pipe 26 and the second inner layer pipe 28. The integral outer pipe 21 is provided with an outer pipe joint seat 29 corresponding to the connecting hole 30 of the inner layer module 27.

[0049] like Figure 1 、 Figure 2 、 Figure 3 and Figure 8 As shown, the supply pipe 12 includes a third inner layer tube 31, an intermediate tube 32, an outer layer tube 33 and a threaded joint 34 which are sequentially sleeved from the inside to the outside. The intermediate tube 32 is located between the third inner layer tube 31 and the outer layer tube 33. The end of the third inner layer tube 31 is exposed through the end of the outer layer tube 33. The end of the third inner layer tube 31 is at least partially connected to the connecting hole 30 to connect to the inner module 27. One end of the threaded joint 34 is sleeved on the end of the outer layer tube 33, and the other end is sleeved on the end of the third inner layer tube 31 through a two-half-type ferrule 35. The outer tube joint seat 29 is sleeved on the end of the threaded joint 34.

[0050] like Figure 9 As shown, the number of intermediate tubes 32 can be more than one. For example, there can be four intermediate tubes 32, which are spaced apart along the wall of the third inner tube 31 to accommodate the outer tube 33. At the bend of the third inner tube 31 and the outer tube 33 of the supply tube 12, a two-half intermediate tube 32 is designed to facilitate the simultaneous bending of the third inner tube 31 and the outer tube 33.

[0051] By designing this special structure of the low-pressure methanol pipeline, the structure is simple and has a certain error compensation capability, thereby improving the reliability of the pipeline operation.

[0052] In some optional embodiments, the number of the supply pipes 12 is two.

[0053] In some optional embodiments, the two supply pipes 12 are connected to the same inner module 27. Directly connecting the two supply pipes 12 to the same inner module 27 reduces processing errors.

[0054] In some optional embodiments, a first sealing ring 36 is provided at the connection between the threaded joint 34 and the outer tube 33 , and a first ring groove 51 is provided on the threaded joint 34 corresponding to the first sealing ring 36 .

[0055] In some optional embodiments, a second sealing ring 37 is provided at the connection between the threaded joint 34 and the outer pipe joint seat 29 , and a second ring groove 52 is provided on the threaded joint 34 corresponding to the second sealing ring 37 .

[0056] In some optional embodiments, at least two third sealing rings 38 are axially provided at the connection between the third inner tube 31 and the connecting hole 30 , and the third inner tube 31 is provided with a third ring groove 53 corresponding to each third sealing ring 38 .

[0057] Here, the first sealing ring 36, the second sealing ring 37 and the third sealing ring 38 can be made of methanol corrosion-resistant materials. The relevant methanol corrosion-resistant materials are mature products in the market and are not specifically limited here.

[0058] The third inner tube 31 is sealed with a double sealing ring. Made of a special material, the sealing rings are highly resistant to methanol corrosion and are relatively mature in the market, providing both reliable and cost-effective sealing. The second layer also uses a sealing ring. This sealing structure is highly reliable and, compared to traditional arc-surface and conical-surface seals or gasket seals, can compensate for manufacturing errors. It also offers superior methanol corrosion resistance, making it more suitable for sealing low-pressure methanol pipelines.

[0059] In some optional embodiments, such as Figure 1 、 Figure 4 and Figure 5 As shown, three welding holes 25 are opened in the middle of the integral outer tube 21, and the inner layer module 27 is welded to the integral outer tube 21 through the three welding holes 25, thereby enhancing the rigidity of the outer tube connection.

[0060] In some optional embodiments, such as Figure 3 、 Figure 10 、 Figure 11 and Figure 12 As shown, the third inner tube 31 and the two-half ferrule 35 are correspondingly provided with a circular arc groove 40 and a circular arc protrusion 39 .

[0061] In some optional embodiments, such as Figure 4 and Figure 6As shown, a flange has a circular groove 43 on one end, with at least ten holes 41 formed in the groove for circulation between the inner and outer pipes. The inner pipe is inserted into the flange hole using a double weld. A boss 42 is provided at the flange end for butt welding to the outer pipe, reducing stress concentration and improving reliability. The diameter of the holes 41 can be, for example, 5 mm. The ten or more holes 41 can be evenly distributed. The height of the boss 42 relative to the flange body can be, for example, 10 mm.

[0062] The embodiment of the present application provides a novel process method for a low-pressure methanol pipeline structure, including the following steps S01 to S11, wherein steps S01 to S03 are supply pipe processes, and steps S04 to S10 are common rail pipe processes.

[0063] Step S01 : providing a third inner tube 31 , and sequentially sleeve the intermediate tube 32 and the outer tube 33 on the outer side of the third inner tube 31 , so that the end of the third inner tube 31 is exposed through the end of the outer tube 33 .

[0064] Step S02 , bending the third inner tube 31 and the outer tube 33 together to form a tube.

[0065] Step S03, provide a threaded joint 34, insert the threaded joint 34 from the end of the third inner tube 31 and move it toward the outer tube 33 side, install the two-half ferrule 35, and then move the threaded joint 34 toward the end of the third inner tube 31, so that one end of the threaded joint 34 is sleeved on the end of the outer tube 33, and the other end is sleeved on the end of the third inner tube 31 through the two-half ferrule 35 and the pipe wall exposed through the end of the outer tube 33 to form the supply pipe 12.

[0066] In step S04 , the first inner layer tube 26 , the inner layer module 27 and the second inner layer tube 28 are welded together to form an inner layer pipeline, wherein the inner layer module 27 is provided with a connecting hole 30 .

[0067] Step S05: Welding one end of the inner pipeline to the first flange 23.

[0068] Step S06: Radiographic inspection is performed to determine whether the welds of the inner layer pipeline meet the requirements. After ensuring that the welds of the inner layer pipeline meet the requirements, the subsequent steps are continued.

[0069] In step S07 , the outer tube 33 is sleeved on the inner tube and welded to the first flange 23 .

[0070] Step S08 , sleeve the two-half outer tube 22 onto the inner tube and weld them to the integral outer tube 33 to form the outer tube 33 .

[0071] Step S09: Weld the second flange 24 to the other end of the outer layer pipe 33 and the inner layer pipe.

[0072] In step S10 , the connection hole 30 and the outer tube joint seat 29 are positioned by using the step process rod 54 , and the outer tube joint seat 29 is welded to the integral outer layer tube 33 to form the common rail tube 11 .

[0073] In step S11 , the end of the third inner layer tube 31 is at least partially connected to the connecting hole 30 to communicate with the inner layer module 27 , and the outer tube joint seat 29 is sleeved on the end of the threaded joint 34 .

[0074] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, the above-mentioned features may be interchangeably formed with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A new low-pressure methanol pipeline structure, characterized in that: include: Common rail pipe and supply pipe; wherein, The common rail pipe includes an inner layer pipe and an outer layer pipe which are coaxially sleeved and fixed at both ends by flanges. The inner layer pipe includes a first inner layer pipe, an inner layer module and a second inner layer pipe which are connected in sequence. The inner layer module is provided with a connecting hole which is used to connect the supply pipe. The outer layer pipe includes a connected integral outer pipe and two halves of the outer pipe. The integral outer pipe covers the inner layer module and at least part of the first inner layer pipe and the second inner layer pipe. The integral outer pipe is provided with an outer pipe joint seat corresponding to the connecting hole of the inner layer module. One end face of the flange is provided with a circular groove, and the circular groove is provided with more than 10 holes for circulation between the inner layer pipeline and the outer layer pipeline; The supply pipe includes a third inner layer pipe, an intermediate pipe, an outer layer pipe and a threaded joint which are sequentially sleeved from the inside to the outside. The intermediate pipe is located between the third inner layer pipe and the outer layer pipe, the end of the third inner layer pipe is exposed through the end of the outer layer pipe, and the end of the third inner layer pipe is at least partially connected to the connecting hole to connect with the inner layer module. One end of the threaded joint is sleeved on the end of the outer layer pipe, and the other end is sleeved on the pipe wall of the third inner layer pipe exposed through the end of the outer layer pipe through a two-half-type ferrule. The outer pipe joint seat is sleeved on the end of the threaded joint.

2. The novel low-pressure methanol pipeline structure according to claim 1 is characterized in that: The number of the supply pipes is two.

3. The novel low-pressure methanol pipeline structure according to claim 2 is characterized in that: The two supply pipes are connected to the same inner module.

4. The novel low-pressure methanol pipeline structure according to claim 1 is characterized in that: A first sealing ring is provided at the connection between the threaded joint and the outer tube, and a first ring groove is provided on the threaded joint corresponding to the first sealing ring.

5. The novel low-pressure methanol pipeline structure according to claim 1 is characterized in that: A second sealing ring is provided at the connection between the threaded joint and the outer pipe joint seat, and a second ring groove is provided on the threaded joint corresponding to the second sealing ring.

6. The novel low-pressure methanol pipeline structure according to claim 1, characterized in that: At least two third sealing rings are axially arranged at the connection point between the third inner layer tube and the connecting hole, and the third inner layer tube is provided with a third ring groove corresponding to each third sealing ring.

7. The novel low-pressure methanol pipeline structure according to claim 1, characterized in that: Three welding holes are opened in the middle of the integral outer tube, and the inner layer module is welded to the integral outer tube through the three welding holes.

8. The novel low-pressure methanol pipeline structure according to claim 1, characterized in that: The third inner tube and the two-half ferrules are correspondingly provided with circular arc grooves and circular arc protrusions.

9. The novel low-pressure methanol pipeline structure according to claim 1, characterized in that: The inner layer pipeline is inserted into the flange hole using double welds, and the flange end is provided with a boss for butt welding with the outer layer pipeline.

10. A process for manufacturing a novel low-pressure methanol pipeline structure, for manufacturing the novel low-pressure methanol pipeline structure according to any one of claims 1 to 9, characterized in that: include: Providing a third inner tube, and sequentially sleeve an intermediate tube and an outer tube on the outer side of the third inner tube so that an end of the third inner tube is exposed through an end of the outer tube; Bending the third inner tube and the outer tube together to form a tube; Providing a threaded joint, inserting the threaded joint from the end of the third inner tube and moving it toward the outer tube, inserting a two-half ferrule, and then moving the threaded joint toward the end of the third inner tube so that one end of the threaded joint is sleeved on the end of the outer tube and the other end is sleeved through the two-half ferrule on the wall of the third inner tube exposed through the end of the outer tube, thereby forming a supply tube; Welding the first inner layer tube, the inner layer module and the second inner layer tube to form an inner layer pipeline, wherein the inner layer module is provided with a connecting hole; Welding a first flange to one end of the inner pipeline; Radiographic inspection of the welds of the inner pipeline to see if they meet the requirements; Sleeve the outer pipe over the inner pipe and weld it to the first flange; The two-half outer pipe is sleeved on the inner pipe and welded to the integral outer pipe to form an outer pipe; Welding a second flange to the other end of the outer layer pipeline and the inner layer pipeline; Positioning the connecting hole and the outer tube joint seat by a step process rod, and welding the outer tube joint seat to the integral outer layer tube to form a common rail tube; The end portion of the third inner layer pipe is at least partially connected to the connecting hole to communicate with the inner layer module, and the outer pipe joint seat is sleeved on the end portion of the threaded joint.

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