A gas double-wall rail pipe

Abstract

This utility model relates to the field of natural gas engine technology, specifically to a double-walled gas rail pipe. The double-walled rail pipe includes an outer pipe for transporting air, an inner pipe for transporting gas located inside the outer pipe, and a solenoid valve connecting pipe that passes sequentially through the outer and inner pipes. The end of the solenoid valve connecting pipe located outside the outer pipe has a solenoid valve connecting flange that abuts against the outer wall of the outer pipe. A solenoid valve is mounted on the solenoid valve connecting flange, and an injector is connected to the solenoid valve. The middle section of the solenoid valve connecting pipe has an annular protrusion that abuts against the outer wall of the inner pipe. The end of the solenoid valve connecting pipe located inside the inner pipe is threaded with a fixing nut. Directly cooperating with the solenoid valve and injector, the outer pipe maintains a constant negative pressure, with room temperature air flowing inside to carry away any leaking gas, ensuring the safety of the engine room.

Description

Technical Field

[0001] This utility model relates to the field of natural gas engine technology, specifically to a gas double-wall rail pipe. Background Technology

[0002] Existing marine natural gas engine gas pipelines, such as Chinese patent CN205089487U, disclose a gas engine pipeline sealing device, including an inner gas transmission pipe. The inlet and outlet ends of the inner gas transmission pipe are respectively fitted with connecting pipes. The outer surface of the inner gas transmission pipe has oppositely arranged annular shoulders. Each connecting pipe has a stepped through hole. The annular shoulders are located in the corresponding stepped through holes. Two annular sealing gaskets are respectively fitted on the outside of the corresponding inner gas transmission pipe. The annular sealing gaskets are located between the corresponding annular shoulders and the steps of the stepped through holes, and the two end faces of the two annular sealing gaskets abut against the corresponding annular shoulders and the steps of the stepped through holes, respectively. An outer pipe is fitted on the outside of the inner gas transmission pipe. The two ends of the outer pipe are respectively located in the corresponding connecting pipes, and a first sealing structure is provided between the two ends of the outer pipe and the corresponding connecting pipes. The areas enclosed by the annular sealing gaskets, connecting pipes, first sealing structures, and outer pipes respectively form sealed cavities.

[0003] The above technical solution has the following disadvantages: it can only be used in the gas transmission process and cannot be directly used with solenoid valves and ejector tubes. Utility Model Content

[0004] The purpose of this invention is to provide a gas double-walled rail pipe that directly works with a solenoid valve and an ejector tube to address the above problems. The outer pipe is always under negative pressure, and room temperature air flows inside the outer pipe to carry away any leaking gas and ensure the safety of the engine room.

[0005] To achieve the above objectives, this utility model discloses a gas double-wall rail pipe. The double-wall rail pipe includes an outer pipe for transporting air, an inner pipe for transporting gas located inside the outer pipe, and a solenoid valve connecting pipe that passes through the outer pipe and the inner pipe in sequence. The end of the solenoid valve connecting pipe located outside the outer pipe has a solenoid valve connecting flange that can abut against the outer wall of the outer pipe. A solenoid valve is installed on the solenoid valve connecting flange, and an ejector tube is connected to the solenoid valve. The middle section of the solenoid valve connecting pipe has an annular protrusion that can abut against the outer wall of the inner pipe. The end of the solenoid valve connecting pipe located inside the inner pipe is threaded with a fixing nut.

[0006] In operation, the inner pipeline acts as a gas pressure regulating chamber, storing a sufficient volume of gas. This gas is then supplied to the engine for combustion via various solenoid valves. The solenoid valves control the gas injection quantity by adjusting their opening timing. The gas enters the engine intake manifold through the injector and then into the engine combustion chamber. The outer pipeline maintains a constant negative pressure, with room temperature air flowing within it to carry away any leaked gas and ensure the safety of the engine compartment.

[0007] The technical solution itself can effectively realize a double-layer structure for gas transmission pipelines. Most of the components in this structure are made from existing profiles, making material acquisition simple and processing parts without special precision requirements, resulting in low manufacturing difficulty. Furthermore, this structure can be flexibly matched to the different needs of various engines, offering broad applicability.

[0008] Preferably, a base fixing bracket is placed inside the inner pipe, located between the fixing nut and the inner wall of the inner pipe, and allowing the solenoid valve connecting pipe to pass through.

[0009] Before assembly, place the entire base fixing bracket in the inner pipe. During assembly, follow the order of fixing nuts, first use the thread of the solenoid valve connecting pipe to the thread inside the fixing nut for preliminary engagement. After all engagement is completed, tighten the solenoid valve connecting pipe to the tightening torque. This structure facilitates the installation of the solenoid valve connecting pipe.

[0010] Preferably, the base mounting bracket has several weight-reducing holes.

[0011] This structure helps reduce the weight of the base mounting bracket.

[0012] Preferably, it further includes a fastening bolt that passes through the outer pipe and the inner pipe in sequence. The end of the fastening bolt located on the outside of the outer pipe is fitted with a pressure plate that can abut against the outer wall of the outer pipe. The end of the fastening bolt located on the outside of the outer pipe is threaded with a cap nut. The pressure plate is located between the cap nut and the outer wall of the outer pipe. The middle section of the fastening bolt has a flange boss that can abut against the outer wall of the inner pipe. The end of the fastening bolt located on the inside of the inner pipe is threaded with a flange nut.

[0013] Due to manufacturing errors, after tightening the solenoid valve connecting pipe and the base mounting bracket, insufficient clamping force may occur between the solenoid valve connecting flange and the external pipe, resulting in a failure to seal. During assembly, tighten the flange nut and fastening stud through the through hole at the solenoid valve connecting pipe location. After tightening the lower thread of the fastening stud, begin tightening the cap nut. The tightening gap between the inner side of the cap nut and the top of the fastening stud is a key factor in ensuring a stable sealing structure between the inner and outer pipes, and between the outer pipe and the solenoid valve connecting flange. During tightening, the threads of the cap nut and the fastening stud continuously engage, and the fastening stud moves upward under the tightening torque, thereby securing the inner pipe, the fastening stud, and the solenoid valve connecting flange.

[0014] Preferably, an outer pipe cover plate is installed at the end of the outer pipe, an inner pipe cover plate is installed at the end of the inner pipe, and a connecting rod connects the outer pipe cover plate and the inner pipe cover plate.

[0015] This structure secures the inner pipe end to the outer pipe end, improving the stability of the inner pipe.

[0016] Preferably, the first end of the outer pipe is connected to an outer pipe inlet flange, the first end of the inner pipe is connected to an inner pipe inlet flange, and a conversion flange is installed between the outer pipe inlet flange and the inner pipe inlet flange. The conversion flange has an air passage that can communicate with the inside of the outer pipe and a gas passage that can communicate with the inside of the inner pipe.

[0017] In use, gas enters the inner pipe through the gas passage, and air enters the outer pipe through the air passage. At the same time, this structure secures the beginning of the inner pipe to the beginning of the outer pipe, improving the robustness of the inner pipe.

[0018] Preferably, a filter element is installed on the inner side of the first end of the inner pipe.

[0019] When in use, the gas enters the inner pipe after being filtered by the filter element, which helps to improve the cleanliness of the gas.

[0020] Preferably, it also includes a filter element tube, with the filter element located inside the filter element tube. A filter element connecting tube connects the inner pipe and the filter element tube. One end of the filter element connecting tube has an outer ring that can be fitted onto the inner pipe, and the other end of the filter element connecting tube has an inner ring that can be inserted into the filter element connecting tube.

[0021] When in use, the filter element is located inside the filter element tube. This structure facilitates the installation of the filter element tube and reduces manufacturing and maintenance costs.

[0022] Preferably, a ventilation pipe is connected to the side of the tail end of the external pipe, and a ventilation flange is connected to the ventilation pipe.

[0023] When in use, the air in the external duct leaves the external duct through the ventilation pipe.

[0024] Preferably, the cross-sectional shape of the outer pipe is rectangular, and the cross-sectional shape of the inner pipe is rectangular.

[0025] In this structure, the sides of both the outer and inner pipes are flat, which is conducive to setting up a sealing structure. The method of setting up the sealing structure adopts existing technology and will not be elaborated here.

[0026] In summary, the beneficial effects of this invention are as follows: During use, the inner pipeline acts as a gas pressure regulating chamber, storing a sufficient volume of gas. It supplies the engine with the natural gas required for combustion through various solenoid valves. The solenoid valves control the gas injection quantity by controlling the opening time. The gas enters the engine intake manifold via the injector and then enters the engine combustion chamber. The outer pipeline maintains a constant negative pressure, with room temperature air flowing inside to carry away any leaking gas, ensuring the safety of the engine compartment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a gas double-wall rail pipe according to this utility model; Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is a schematic diagram of the internal structure of a gas double-wall rail pipe according to this utility model; Figure 4 yes Figure 3 A magnified structural diagram of part B in the middle; Figure 5 yes Figure 4 A schematic diagram of the right-side view structure; Figure 6 yes Figure 4 Schematic diagram of the mid-section CC; Figure 7 This is a schematic diagram of the base fixing bracket in a gas double-walled rail pipe according to the present invention.

[0028] In the diagram: 1. External pipe; 2. Internal pipe; 3. Ventilation flange; 4. Conversion flange; 401. Gas passage; 402. Air passage; 5. External pipe inlet flange; 6. Cap nut; 7. Solenoid valve; 8. Injector tube; 9. Fastening bolt; 10. Flange boss; 11. Flange nut; 12. Pressure plate; 13. External pipe cover plate; 14. Connecting rod; 15. Internal pipe cover plate; 16. Ventilation pipe; 17. Base fixing bracket; 1701. Weight reduction hole; 18. Solenoid valve connecting pipe; 19. Fixing nut; 20. Annular protrusion; 21. Solenoid valve connecting flange; 22. Filter element connecting pipe; 23. Outer ring; 24. Inner ring; 25. Filter element tube; 26. Filter element; 27. Internal pipe inlet flange. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] like Figures 1 to 7 As shown, a gas double-walled rail pipe includes an outer pipe 1 for transporting air, an inner pipe 2 for transporting gas located inside the outer pipe 1, and a solenoid valve connecting pipe 18 that passes through the outer pipe 1 and the inner pipe 2 in sequence. The end of the solenoid valve connecting pipe 18 located outside the outer pipe 1 has a solenoid valve connecting flange 21 that abuts against the outer wall of the outer pipe 1. A solenoid valve 7 is mounted on the solenoid valve connecting flange 21, and an ejector tube 8 is connected to the solenoid valve 7. The middle section of the solenoid valve connecting pipe 18 has an annular protrusion 20 that abuts against the outer wall of the inner pipe 2. A fixing nut 19 is threadedly connected to the end of the solenoid valve connecting pipe 18 located inside the inner pipe 2. Specifically, the outer diameter of the solenoid valve connecting flange 21 is larger than the outer diameter of the annular protrusion 20, which is also larger than the outer diameter of the end of the solenoid valve connecting pipe 18 located inside the inner pipe 2. In operation, the inner pipe 2 acts as a gas pressure regulating chamber, storing a sufficient volume of gas. This gas is supplied to the engine for combustion via various solenoid valves 7. The solenoid valves 7 control the gas injection quantity by adjusting their opening time. The gas enters the engine intake manifold via the injector pipe 8 and then into the engine combustion chamber. The outer pipe 1 maintains a constant negative pressure, with room temperature air flowing within it to carry away any leaking gas and ensure the safety of the engine compartment.

[0034] The technical solution itself can effectively realize a double-layer structure for gas transmission pipelines. Most of the components in this structure are made from existing profiles, making material acquisition simple and processing parts without special precision requirements, resulting in low manufacturing difficulty. Furthermore, this structure can be flexibly matched to the different needs of various engines, offering broad applicability.

[0035] Specifically, the outer pipe 1 has a rectangular cross-sectional shape, and the inner pipe 2 has a rectangular cross-sectional shape. In this structure, the sides of both the outer pipe 1 and the inner pipe 2 are flat, which is beneficial for setting up a sealing structure. How to set up the sealing structure adopts existing technology and will not be elaborated here.

[0036] like Figures 3 to 7 As shown, a base bracket 17 is placed inside the inner pipe 2, located between the fixing nut 19 and the inner wall of the inner pipe 2, through which the solenoid valve connecting pipe 18 passes. Specifically, the fixing nut 19 and the base bracket 17 are welded together. The number of fixing nuts 19 depends on the number of cylinders in the engine, and the distance between two adjacent fixing nuts 19 depends on the cylinder center distance of the engine. Before assembly, the entire base bracket 17 is placed in the inner pipe 2. During assembly, following the order of the fixing nuts 19, the threads of the solenoid valve connecting pipe 18 are first initially screwed into the threads inside the fixing nuts 19. After all threads are screwed in, the solenoid valve connecting pipe 18 is fully tightened to the tightening torque. This structure facilitates the installation of the solenoid valve connecting pipe 18. Several weight-reducing holes 1701 are provided on the base bracket 17. This structure helps to reduce the weight of the base bracket 17.

[0037] like Figures 1 to 4As shown, it also includes fastening bolts 9 that pass through the outer pipe 1 and the inner pipe 2 in sequence. One end of the fastening bolt 9 located outside the outer pipe 1 is fitted with a pressure plate 12 that abuts against the outer wall of the outer pipe 1. A cap nut 6 is threadedly connected to the other end of the fastening bolt 9 located outside the outer pipe 1. The pressure plate 12 is located between the cap nut 6 and the outer wall of the outer pipe 1. A flange boss 10, which abuts against the outer wall of the inner pipe 2, is located in the middle section of the fastening bolt 9. A flange nut 11 is threadedly connected to the other end of the fastening bolt 9 located inside the inner pipe 2. Specifically, the cap nut 6 is welded to the pressure plate 12. Due to machining errors, after the solenoid valve connecting pipe 18 is tightened to the base fixing bracket 17, insufficient clamping force may occur between the solenoid valve connecting flange 21 and the outer pipe 1, resulting in a lack of seal. During assembly, the flange nut 11 and the fastening stud 9 are tightened through the through hole at the position of the solenoid valve connecting pipe 18. After the lower thread of the fastening stud 9 is tightened, the cap nut 6 is tightened. The tightening gap between the inner side of the cap nut 6 and the top of the fastening stud 9 is a key factor in ensuring a stable sealing structure between the inner pipe 2 and the outer pipe 1, and between the outer pipe 1 and the solenoid valve connecting flange 21. During tightening, the threads of the cap nut 6 and the fastening stud 9 continuously engage, and the fastening stud 9 moves upward under the tightening torque, thereby securing the inner pipe 2, the fastening stud 9, and the solenoid valve connecting flange 21.

[0038] An outer pipe cover plate 13 is installed at the end of the outer pipe 1, and an inner pipe cover plate 15 is installed at the end of the inner pipe 2. A connecting rod 14 connects the outer pipe cover plate 13 and the inner pipe cover plate 15. This structure secures the end of the inner pipe 2 to the end of the outer pipe 1, improving the robustness of the inner pipe 2. An outer pipe inlet flange 5 is connected to the beginning of the outer pipe 1, and an inner pipe inlet flange 27 is connected to the beginning of the inner pipe 2. A conversion flange 4 is installed between the outer pipe inlet flange 5 and the inner pipe inlet flange 27. The conversion flange 4 has an air passage 402 that can communicate with the inside of the outer pipe 1, and a gas passage 401 that can communicate with the inside of the inner pipe 2. In use, gas enters the inner pipe 2 through the gas passage 401, and air enters the outer pipe 1 through the air passage 402. This structure also secures the beginning of the inner pipe 2 to the beginning of the outer pipe 1, improving the robustness of the inner pipe 2.

[0039] A ventilation pipe 16 is connected to the side of the tail end of the outer pipe 1, and a ventilation flange 3 is connected to the ventilation pipe 16. In use, the air in the outer pipe 1 leaves the outer pipe 1 through the ventilation pipe 16.

[0040] like Figure 4As shown, a filter element 26 is installed on the inner side of the first end of the inner pipe 2. During use, the gas enters the inner pipe 2 after being filtered by the filter element 26, which helps improve the cleanliness of the gas. It also includes a filter tube 25, with the filter element 26 located inside the filter tube 25. A filter connecting pipe 22 connects the inner pipe 2 and the filter tube 25. One end of the filter connecting pipe 22 has an outer ring 23 that can be fitted onto the inner pipe 2, and the other end has an inner ring 24 that can be inserted into the filter connecting pipe 22. During use, the filter element 26 is located inside the filter tube 25. This structure facilitates the installation of the filter tube 25 and reduces manufacturing and maintenance costs.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A gas-fired double-walled rail pipe, characterized in that, It includes an outer pipe (1) for conveying air, an inner pipe (2) for conveying gas is provided inside the outer pipe (1), and a solenoid valve connecting pipe (18) passing through the outer pipe (1) and the inner pipe (2) in sequence. The end of the solenoid valve connecting pipe (18) located outside the outer pipe (1) has a solenoid valve connecting flange (21) that can abut against the outer wall of the outer pipe (1). A solenoid valve (7) is installed on the solenoid valve connecting flange (21). An ejector pipe (8) is connected to the solenoid valve (7). The middle section of the solenoid valve connecting pipe (18) has an annular protrusion (20) that can abut against the outer wall of the inner pipe (2). A fixing nut (19) is threaded to the end of the solenoid valve connecting pipe (18) located inside the inner pipe (2).

2. The gas double-walled rail pipe as described in claim 1, characterized in that, A base fixing bracket (17) is placed inside the inner pipe (2) between the fixing nut (19) and the inner wall of the inner pipe (2), and allows the solenoid valve connecting pipe (18) to pass through.

3. The gas double-walled rail pipe as described in claim 2, characterized in that, The base fixing bracket (17) has several weight reduction holes (1701).

4. The gas double-walled rail pipe according to any one of claims 1 to 3, characterized in that, It also includes fastening bolts (9) that pass through the outer pipe (1) and the inner pipe (2) in sequence. One end of the fastening bolt (9) located outside the outer pipe (1) is fitted with a pressure plate (12) that can abut against the outer wall of the outer pipe (1). One end of the fastening bolt (9) located outside the outer pipe (1) is threaded with a cap nut (6). The pressure plate (12) is located between the cap nut (6) and the outer wall of the outer pipe (1). The middle section of the fastening bolt (9) has a flange boss (10) that can abut against the outer wall of the inner pipe (2). One end of the fastening bolt (9) located inside the inner pipe (2) is threaded with a flange nut (11).

5. The gas double-walled rail pipe as described in any one of claims 1 to 3, characterized in that, An outer pipe cover plate (13) is installed at the end of the outer pipe (1), and an inner pipe cover plate (15) is installed at the end of the inner pipe (2). A connecting rod (14) connects the outer pipe cover plate (13) and the inner pipe cover plate (15).

6. The gas double-walled rail pipe according to any one of claims 1 to 3, characterized in that, The first end of the outer pipe (1) is connected to an outer pipe inlet flange (5), and the first end of the inner pipe (2) is connected to an inner pipe inlet flange (27). A conversion flange (4) is installed between the outer pipe inlet flange (5) and the inner pipe inlet flange (27). An air passage (402) that can communicate with the inside of the outer pipe (1) and a gas passage (401) that can communicate with the inside of the inner pipe (2) are provided on the conversion flange (4).

7. The gas double-walled rail pipe according to any one of claims 1 to 3, characterized in that, A filter element (26) is installed on the inner side of the first end of the inner pipe (2).

8. The gas double-walled rail pipe as described in claim 7, characterized in that, It also includes a filter tube (25), a filter element (26) located inside the filter tube (25), and a filter connecting tube (22) connecting the inner pipe (2) and the filter tube (25). One end of the filter connecting tube (22) has an outer ring (23) that can be fitted onto the inner pipe (2), and the other end of the filter connecting tube (22) has an inner ring (24) that can be inserted into the filter connecting tube (22).

9. The gas double-walled rail pipe according to any one of claims 1 to 3, characterized in that, The outer pipe (1) is connected to a ventilation pipe (16) at the tail end, and a ventilation flange (3) is connected to the ventilation pipe (16).

10. The gas double-walled rail pipe according to any one of claims 1 to 3, characterized in that, The cross-sectional shape of the outer pipe (1) is rectangular, and the cross-sectional shape of the inner pipe (2) is rectangular.

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