Dual fuel pipeline connector, engine dual fuel supply system and vehicle

Abstract

The present invention relates to a dual-fuel pipeline joint, comprising an inner tube, an outer tube, and a connector. The inner tube is provided with a first passageway, the first passageway being connected to a first fuel source for providing a first fuel; the outer tube is sleeved onto the outer tube, and a gap is provided between the outer wall of the inner tube and the inner wall of the outer tube, the gap forming a second passageway, the second passageway being connected to a second fuel source for providing a second fuel; the connector is connected to the first passageway and the second passageway, respectively. The sleeved inner and outer tubes are capable of transporting two fuels while having a smaller overall volume and requiring fewer pipelines for arrangement, thereby reducing the space occupied within the vehicle, minimizing the impact on the arrangement of other accessories outside the engine, and improving the aesthetics of the dual-fuel pipeline joint.

Description

Technical Field

[0001] The present invention relates to the technical field of engine fuel supply systems, and in particular to a dual-fuel pipeline joint, an engine dual-fuel supply system and a vehicle. Background Art

[0002] The fuel supply system of a dual-fuel engine requires simultaneous passage of high-pressure fuel and gas, with fuel and gas pressures typically reaching 30MPa-50MPa. Currently, high-pressure fuel and gas pipes in dual-fuel engine supply systems require connectors to connect the high-pressure fuel and gas pipes to the injectors or high-pressure accumulators.

[0003] Due to the complexity of the system, the high-pressure fuel and high-pressure gas pipelines in the existing technology are very numerous after layout, occupying a large space and easily affecting the layout of other accessories outside the engine. At the same time, due to the large space restrictions on the injectors for compact engines, the high-pressure pipeline layout of the dual-fuel supply system is difficult. Summary of the Invention

[0004] Based on this, it is necessary to provide a dual fuel pipeline joint to address the problem that the high-pressure fuel pipeline and the high-pressure gas pipeline occupy a large space.

[0005] A dual fuel pipe connector for connecting to an engine dual fuel supply system, wherein the engine dual fuel supply system is provided with a first fuel source and a second fuel source, wherein the dual fuel pipe connector comprises:

[0006] an inner tube, wherein a first passage is provided inside the inner tube, and the first passage is used to communicate with the first fuel source;

[0007] an outer tube, the outer tube being sleeved on the outer side of the inner tube, and a gap being provided between the outer wall of the inner tube and the inner wall of the outer tube, the gap forming a second passage, the second passage being used to communicate with the second fuel source;

[0008] A connecting head is provided with a fuel channel, and the fuel channel is communicated with the first channel and the second channel at the same time.

[0009] In one embodiment, the end of the outer tube away from the second fuel source is spaced apart from the connector in the first direction, and a sealing ring is provided between the outer tube and the connector;

[0010] The sealing ring is sleeved outside the inner tube, and two side surfaces of the sealing ring in the first direction are respectively in contact with the outer tube and the connector;

[0011] The sealing ring is provided with a first through hole extending along the first direction, and both ends of the first through hole are respectively communicated with the second passage and the fuel channel.

[0012] In one embodiment, the sealing ring is configured as an elastic sealing ring.

[0013] In one embodiment, a compression block is provided at one end of the outer tube away from the second fuel source, and the compression block is provided to protrude relative to the outer wall of the outer tube; and a compression member is provided on the outer surface of the outer tube;

[0014] One end of the clamping member is connected to the connecting head and can move in the first direction relative to the connecting head. The other end of the clamping member is provided with a protrusion protruding relative to its inner side wall, and the protrusion can be snap-fitted with the clamping member in the first direction.

[0015] In one embodiment, the pressing member is configured as a locking nut, and an end of the locking nut away from the outer tube is threadedly connected to the connector.

[0016] In one embodiment, the connector is provided with a third passage communicating with the first passage, and the outer wall of the end of the inner tube away from the first fuel source is arranged in contact with the inner wall of the third passage.

[0017] In one embodiment, a compression step is provided on the outer periphery of one end of the inner tube away from the first fuel source, and the compression step can be snap-fitted with the compression block in the first direction;

[0018] The outer tube can move relative to the pressing member toward the connecting head to drive the inner tube to move relative to the third passage.

[0019] In one embodiment, the first fuel is gaseous fuel, and the second fuel is oil fuel.

[0020] An engine dual-fuel supply system comprises the dual-fuel pipeline connector described in any one of the above items.

[0021] A vehicle comprises the above-mentioned engine dual-fuel supply system.

[0022] The above-mentioned dual-fuel pipeline joint includes an inner tube, an outer tube and a connecting head. A first passage is provided inside the inner tube, and the first passage is connected to a first fuel source for providing a first fuel. The outer tube is sleeved on the outside of the inner tube, and a gap is provided between the outer wall of the inner tube and the inner wall of the outer tube. The gap forms a second passage, and the second passage is connected to a second fuel source for providing a second fuel. The fuel channel of the connecting head is connected to the first channel and the second channel respectively.

[0023] When the engine dual fuel supply system is working, the first fuel source provides the first fuel to the first passage, and the second fuel source provides the second fuel to the second passage. The first fuel flows through the first passage to the fuel channel of the connecting head and continues to flow to the subsequent working equipment; the second fuel flows through the second passage to the fuel channel of the connecting head and continues to flow to the subsequent working equipment.

[0024] The flow of the first fuel and the second fuel can be achieved through the first passage provided in the inner tube and the second passage provided in the outer tube, and the first fuel and the second fuel are separated by the tube wall of the inner tube, thereby avoiding mixing of the two. The overall volume of the inner tube and the outer tube arranged in a sleeve is smaller, and fewer pipelines are required for layout, thereby reducing the space occupied in the vehicle, reducing the impact on the layout of other accessories outside the engine, and improving the aesthetics of the dual-fuel pipeline joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of the dual fuel pipeline joint provided by the present invention;

[0026] Figure 2 for Figure 1 Magnified image in .

[0027] In the figure: 1. Inner tube; 2. Outer tube; 3. Compression piece; 4. Sealing ring; 5. Connector; 6. First passage; 7. Second passage; 8. Third passage; 9. Fourth passage; 10. First through hole; 11. Fourth through hole; 12. First protrusion; 13. Second protrusion; 14. Third protrusion; 15. Compression block; 16. Compression step. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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, rather than indicating or implying 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 limiting the present invention.

[0030] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] The present application provides a dual fuel pipeline connector for connecting to an engine dual fuel supply system, wherein the engine dual fuel supply system is provided with a first fuel source and a second fuel source. Figure 1 and Figure 2 In some embodiments, a dual fuel pipeline joint includes an inner tube 1, an outer tube 2 and a connector 5. A first passage 6 is provided inside the inner tube 1, and the first passage 6 is used to communicate with a first fuel source; the outer tube 2 is sleeved on the outside of the inner tube 1, and a gap is provided between the outer wall of the inner tube 1 and the inner wall of the outer tube 2, and the gap forms a second passage 7, and the second passage 7 is used to communicate with a second fuel source; the connector 5 is provided with a fuel channel, and the fuel channel is connected to the first channel and the second channel at the same time.

[0035] Specifically, a second through hole is provided inside the outer tube 2 along its axial direction, the inner tube 1 is provided in the second through hole, and a third through hole is provided inside the inner tube 1 along the axial direction of the inner tube 1, and the third through hole serves as a first passage 6 for the flow of the first fuel; a gap is provided between the outer wall of the inner tube 1 and the inner wall of the second through hole, and the gap between the inner tube 1 and the outer tube 2 serves as a second passage 7 for the flow of the second fuel; a fuel channel is provided in the connecting head 5, and the fuel channel includes a third channel 8 and a fourth channel 9, the third channel 8 is connected to the first channel, and the fourth channel 9 is connected to the second channel.

[0036] When the vehicle engine dual-fuel supply system is working, the first fuel source provides the first fuel to the first passage 6, and the second fuel source provides the second fuel to the second passage 7. The first fuel flows through the first passage 6 to the third passage 8 of the connector 5, and continues to flow through the third passage 8 to the subsequent working equipment or pipeline; the second fuel flows through the second passage 7 to the fourth passage 9 of the connector 5, and continues to flow through the fourth passage 9 to the subsequent working equipment or pipeline.

[0037] The dual-fuel pipeline joint provided in the present application can realize the flow of the first fuel and the second fuel through the first passage 6 provided in the inner tube 1 and the second passage 7 provided in the outer tube 2, and the first fuel and the second fuel are separated by the tube wall of the inner tube 1, thereby avoiding the mixing of the two. The sleeved inner tube 1 and the outer tube 2 can realize the external second passage 7 to pass the second fuel in the same pipeline, and the internal first passage 6 to pass the first fuel, that is, the two fuel media circulate under the same pipeline and pipeline structure, so the overall volume can be reduced, and fewer pipelines are required for layout, thereby reducing the space occupied in the vehicle, reducing the impact on the layout of other accessories outside the engine, and improving the aesthetics of the dual-fuel pipeline joint.

[0038] In some embodiments, the end of the outer tube 2 away from the second fuel source is spaced apart from the connector 5 in the first direction, and a sealing ring 4 is provided between the outer tube 2 and the connector 5;

[0039] The sealing ring 4 is sleeved on the outer side of the inner tube 1, and the two side surfaces of the sealing ring 4 in the first direction are respectively in contact with the outer tube 2 and the connector 5;

[0040] The sealing ring 4 is provided with a first through hole 10 extending along a first direction. Both ends of the first through hole 10 are communicated with the second passage 7 and the fuel channel respectively.

[0041] Specifically, the first direction is the axial direction of the inner tube 1, and the end of the outer tube 2 away from the second fuel source is spaced apart from the connecting head 5 in the axial direction of the inner tube 1, and a sealing ring 4 is provided at the interval between the outer tube 2 and the connecting head 5. The upper end of the sealing ring 4 is fitted with the bottom of the outer tube 2, and the lower end of the sealing ring 4 is fitted with the top surface of the connecting head 5, and a first through hole 10 is provided inside the sealing ring 4 along the axial direction of the inner tube 1. The first through hole 10 is arranged corresponding to the second passage 7. The first through hole 10 is connected to the second passage 7 near the end of the outer tube 2, and the first through hole 10 is connected to the fourth passage 9 away from the end of the outer tube 2.

[0042] When the vehicle engine dual-fuel supply system is working, the first fuel source provides the first fuel to the first passage 6, and the second fuel source provides the second fuel to the second passage 7. The first fuel flows through the first passage 6 to the third passage 8 of the connector 5, and continues to flow through the third passage 8 to the subsequent working equipment or pipeline; the second fuel flows through the second passage 7 to the first through hole 10 of the sealing ring 4, flows through the first through hole 10 to the fourth passage 9 of the connector 5, and continues to flow through the fourth passage 9 to the subsequent working equipment or pipeline.

[0043] By arranging a sealing ring 4 between the outer tube 2 and the connector 5, leakage of the second fuel from between the outer tube 2 and the connector 5 can be avoided, thereby improving the sealing between the outer tube 2 and the connector 5; a first through hole 10 is arranged in the sealing ring 4, so that the sealing ring 4 can ensure the sealing between the outer tube 2 and the connector 5 while ensuring the circulation of the second fuel, so that the second fuel can flow smoothly from the second passage 7 to the fourth passage 9 in the connector 5.

[0044] Optionally, other numbers of sealing rings 4 may also be provided.

[0045] In some embodiments, the sealing ring 4 is configured as an elastic sealing ring 4 .

[0046] Specifically, the sealing ring 4 is constructed as an elastic sealing ring 4, which is specifically configured as a self-sealing elastic gasket. The self-sealing elastic gasket is arranged between the bottom of the outer tube 2 and the top of the connecting head 5. Since the outer tube 2 is arranged on the outside of the inner tube 1, the outer tube 2 can move relative to the inner tube 1 along its own axial direction.

[0047] When the vehicle engine dual-fuel supply system is working, the first fuel source provides the first fuel to the first passage 6, and the second fuel source provides the second fuel to the second passage 7. The first fuel flows through the first passage 6 to the third passage 8 of the connector 5, and continues to flow through the third passage 8 to the subsequent working equipment or pipeline; the second fuel flows through the second passage 7 to the first through hole 10 of the sealing ring 4, flows through the first through hole 10 to the fourth passage 9 of the connector 5, and continues to flow through the fourth passage 9 to the subsequent working equipment or pipeline.

[0048] When the second fuel flows in the second passage 7, since the second fuel itself has a certain pressure and the outer tube 2 can move along its own axial direction relative to the inner tube 1, the pressure of the second fuel can drive the outer tube 2 to move downward along the axial direction and compress the self-sealing elastic gasket. The self-sealing elastic gasket itself deforms to bear the pressure given by the outer tube 2, and the self-sealing elastic gasket always fits at the bottom of the outer tube 2 and the top of the connector 5.

[0049] The sealing ring 4 is set as an elastic sealing ring 4. When the high-pressure second fuel is introduced, the sealing ring 4 can be squeezed by the outer tube 2, which can increase the sealing surface compression force formed between the sealing ring 4 and the bottom of the outer tube 2 and the top of the connector 5, thereby ensuring the sealing performance between the sealing ring 4 and the outer tube 2 and the connector 5 under high pressure.

[0050] Optionally, other types of elastic sealing rings 4 may also be selected.

[0051] In some embodiments, a compression block 15 is provided at one end of the outer tube 2 away from the second fuel source, and the compression block 15 is provided to protrude relative to the outer wall of the outer tube 2; a compression member 3 is provided on the outer surface of the outer tube 2;

[0052] One end of the pressing member 3 is connected to the connecting head 5 and can move relative to the connecting head 5 in a first direction. The other end of the pressing member 3 is provided with a protrusion protruding relative to its inner side wall, and the protrusion can be snap-fitted with the pressing member 3 in the first direction.

[0053] Specifically, a clamping block 15 is provided at one end of the outer tube 2 close to the connecting head 5, and the bottom surface of the clamping block 15 is in contact with the upper end of the sealing ring 4. A first protrusion 12 is provided radially inward at one end of the clamping block 15, and the inner wall of the first protrusion 12 is in contact with the outer wall of the inner tube 1, and a fourth through hole 11 is provided inside the first protrusion 12, and the upper end of the fourth through hole 11 is connected to the second passage 7, and the lower end of the fourth through hole 11 is connected to the first through hole 10 on the sealing ring 4; a second protrusion 13 is provided radially outward at the other end of the clamping block 15, and the protrusion is a third protrusion 14 provided at the upper end of the clamping piece 3, and the third protrusion 14 overlaps above the second protrusion 13, that is, the bottom surface of the third protrusion 14 is in contact with the top surface of the second protrusion 13, and the lower end of the clamping piece 3 is connected to the connecting head 5.

[0054] When installing the dual-fuel pipeline joint, the compression piece 3 is sleeved on the outside of one end of the outer tube 2 close to the connector 5, and the third protrusion 14 on the compression piece 3 is overlapped with the second protrusion 13 of the compression block 15, and the compression piece 3 is moved downward along the axial direction of the inner tube 1 so that the compression piece 3 compresses the compression block 15 downward to compress the sealing ring 4. The sealing ring 4 undergoes a large deformation in the gap between the outer tube 2 and the connector 5, so that the upper end of the sealing ring 4 fits with the bottom of the compression block 15, and the lower end of the sealing ring 4 fits with the top of the connector 5. The compression of the sealing ring 4 can increase the contact area between the sealing ring 4 and the compression block 15 and the connector 5, thereby ensuring the sealing effect.

[0055] By setting the compression block 15 and the compression piece 3, the sealing ring 4 can be compressed by the compression piece 3 and the compression block 15 to ensure the sealing between the outer tube 2 and the connector 5. The compression piece 3 is connected to the connector 5 to keep the sealing ring 4 in a compressed state.

[0056] Optionally, a groove may be provided on the outer periphery of the bottom of the outer tube 2 , and the third protrusion 14 of the pressing member 3 is plugged into the groove.

[0057] In some embodiments, the pressing member 3 is configured as a locking nut, and one end of the locking nut away from the outer tube 2 is threadedly connected to the connector 5 .

[0058] Specifically, the clamping member 3 is a locking nut, a mounting hole is provided inside the locking nut, the third protrusion 14 is provided on the inner side of the top end of the mounting hole, the bottom of the mounting hole is provided with a thread, and the top of the connecting head 5 is also provided with a thread, and the mounting hole and the connecting head 5 are connected by threads.

[0059] When installing the dual-fuel pipeline joint, the locking nut is sleeved on the outside of the outer tube 2 through the mounting hole, and the locking nut is threadedly connected to the connector 5. The locking nut is rotated to move the locking nut downward along the axial direction of the outer tube 2. The bottom surface of the third protrusion 14 gradually approaches and fits the top surface of the second protrusion 13 during the movement. The locking nut is continued to be rotated, and the clamping block 15 moves downward under the pressure of the locking nut, thereby compressing the sealing ring 4.

[0060] The pressing member 3 is set as a locking nut, which can facilitate the staff to adjust the pressure of the pressing block 15 on the sealing ring 4 and is also convenient for disassembly and assembly.

[0061] Optionally, a fastener may be provided on the connector 5 to press the pressing block 15 of the outer tube 2 downward.

[0062] In some embodiments, the connector 5 is provided with a third passage 8 communicating with the first passage 6 , and the outer wall of the end of the inner tube 1 away from the first fuel source is arranged to fit in with the inner wall of the third passage 8 .

[0063] Specifically, the connector 5 is provided with a third passage 8 , and the end of the third passage 8 close to the inner tube 1 is set as a connecting hole of an inverted truncated cone structure, and the outer periphery of the end of the inner tube 1 close to the connector 5 is set as a cone.

[0064] When installing the dual-fuel pipeline joint, the end of the inner tube 1 away from the first fuel source is plugged into the third passage 8 on the connector 5, and the conical surface at the bottom end of the inner tube 1 is fitted with the inner wall surface of the connecting hole of the third passage 8. At this time, the sealing ring 4 is arranged on the outer periphery of the inner tube 1, and the first passage 6 of the inner tube 1 is connected to the third passage 8 on the connector 5.

[0065] By fitting the outer wall of the end of the inner tube 1 away from the first fuel source with the inner wall of the third passage 8, a rigid seal can be formed between the inner tube 1 and the connector 5, thereby preventing the second fuel from leaking between the outer wall of the inner tube 1 and the inner wall of the third passage 8 when entering the third passage 8 from the first passage 6, thereby ensuring the overall sealing of the dual-fuel pipeline joint.

[0066] Optionally, the end of the third passage 8 close to the inner tube 1 can also be set as a connection hole of other shapes, and the outer periphery of the end of the inner tube 1 close to the connector 5 can also be set as an outer wall surface of other corresponding shapes.

[0067] In some embodiments, a compression step 16 is provided on the outer periphery of one end of the inner tube 1 away from the first fuel source, and the compression step 16 can be engaged with the compression block 15 in the first direction;

[0068] The outer tube 2 can move relative to the pressing member 3 toward the connecting head 5 to drive the inner tube 1 to move relative to the third passage 8 .

[0069] Specifically, a tightening step 16 is provided on the outer periphery of one end of the inner tube 1 close to the connecting head 5, which protrudes radially outward. When installing the dual-fuel pipeline joint, the conical surface on the inner tube 1 is fitted with the inner wall of the third through hole on the connecting head 5, and the outer tube 2 is sleeved on the outside of the inner tube 1, and the tightening block 15 on the outer tube 2 overlaps the tightening step 16 on the inner tube 1, and the locking nut is sleeved on the outside of the outer tube 2. The locking nut is rotated to move the locking nut downward along the axial direction of the outer tube 2, and the outer tube 2 is driven downward by the third protrusion 14 on the locking nut. Since the tightening block 15 of the outer tube 2 overlaps the tightening step 16 of the inner tube 1, the outer tube 2 moves downward and drives the tightening step 16 and the inner tube 1 to move downward along the axial direction through the tightening block 15. At this time, the conical surface of the inner tube 1 is more fitted with the inner wall of the third passage.

[0070] Similarly, when high-pressure fuel is introduced into the second passage 7, the outer tube 2 drives the inner tube 1 downward under the pressure of the high-pressure fuel. At this time, the conical surface of the inner tube 1 fits more closely with the inner wall of the third passage.

[0071] By providing the pressing step 16 , the pressing force between the conical surface of the inner tube 1 and the inner wall of the third passage can be increased when high-pressure fuel is introduced into the second passage 7 , thereby improving the sealing effect therebetween.

[0072] In some embodiments, the first fuel is a gaseous fuel and the second fuel is a fuel oil.

[0073] Specifically, gas fuel is introduced into the first passage 6 and fuel oil is introduced into the second passage 7. When the rigid contact sealing surface formed between the connector 5 and the inner tube 1 fails, the gas fuel leaks from between the connector 5 and the inner tube 1 to the second passage 7 and the fourth passage 9 between the connector 5, the sealing ring 4 and the outer tube 2, thereby preventing the gas fuel from leaking into the external environment and ensuring the safety of the dual-fuel pipeline joint when in use.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A dual fuel line connector for connecting to an engine dual fuel supply system, wherein the engine dual fuel supply system is provided with a first fuel source and a second fuel source, characterized in that: The dual fuel pipeline connector includes: An inner tube (1), wherein a first passage (6) is provided inside the inner tube (1), and the first passage (6) is used to communicate with the first fuel source; An outer tube (2), the outer tube (2) being sleeved on the outside of the inner tube (1), and a gap being provided between the outer wall of the inner tube (1) and the inner wall of the outer tube (2), the gap forming a second passage (7), the second passage (7) being used to communicate with the second fuel source; A connector (5), the connector (5) being provided with a fuel passage, the fuel passage being in communication with both the first passage (6) and the second passage (7); An end of the outer tube (2) away from the second fuel source is spaced apart from the connector (5) in a first direction, and a sealing ring (4) is provided between the outer tube (2) and the connector (5); The sealing ring (4) is sleeved outside the inner tube (1), and the two side surfaces of the sealing ring (4) in the first direction are respectively in contact with the outer tube (2) and the connector (5); The sealing ring (4) is provided with a first through hole (10) extending along the first direction, and both ends of the first through hole (10) are respectively connected to the second passage (7) and the fuel channel; A compression block (15) is provided at one end of the outer tube (2) away from the second fuel source, and the compression block (15) is protruding relative to the outer wall of the outer tube (2); the bottom surface of the compression block (15) is in contact with the upper end of the sealing ring (4); a first protrusion (12) is provided radially inward at one end of the compression block (15), the inner wall of the first protrusion (12) is in contact with the outer wall of the inner tube (1), and a fourth through hole (11) is provided inside the first protrusion (12), the upper end of the fourth through hole (11) is connected to the second passage (7), and the lower end of the fourth through hole (11) is connected to the first through hole (10) on the sealing ring (4).

2. The dual fuel pipeline joint according to claim 1, characterized in that: The sealing ring (4) is constructed as an elastic sealing ring.

3. The dual fuel pipeline joint according to claim 1, characterized in that: The outer layer tube (2) is provided with a compression piece (3); One end of the pressing member (3) is connected to the connecting head (5) and can move relative to the connecting head (5) in the first direction, and the other end of the pressing member (3) is provided with a protrusion protruding relative to its inner side wall, and the protrusion can be snap-fitted with the pressing block (15) in the first direction.

4. The dual fuel pipeline joint according to claim 3, characterized in that: The pressing member (3) is constructed as a locking nut, and the end of the locking nut away from the outer tube (2) is threadedly connected to the connector (5).

5. The dual fuel pipeline joint according to claim 4, characterized in that: The connector (5) is provided with a third passage (8) communicating with the first passage (6), and the outer wall of one end of the inner tube (1) away from the first fuel source is arranged in contact with the inner wall of the third passage (8).

6. The dual fuel pipeline joint according to claim 5, characterized in that: A compression step (16) is provided on the outer periphery of one end of the inner tube (1) away from the first fuel source, and the compression step (16) can be snap-fitted with the compression block (15) in the first direction; The outer tube (2) can move relative to the pressing member (3) in a direction close to the connecting head (5), so as to drive the inner tube (1) to move relative to the third passage (8).

7. The dual fuel pipeline joint according to claim 1, characterized in that: The first fuel source is gaseous fuel, and the second fuel source is oil fuel.

8. The dual fuel pipeline joint according to claim 1, characterized in that: The outer periphery of one end of the inner tube (1) close to the connector (5) is configured as a conical surface.

9. An engine dual fuel supply system, characterized in that: The dual fuel pipeline connector comprises the dual fuel pipeline connector according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Includes the engine dual fuel supply system as described in claim 9.

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