Leak-proof washable circulating heavy oil common rail

Abstract

The invention relates to a leakproof washable circulating heavy oil common rail which comprises a common rail pipe and a circulating block. The common rail pipe is provided with a rail pipe large-diameter sealing surface, a rail pipe small-diameter sealing surface and a common rail pipe leak detection hole, and is used for providing mounting positions for a common rail cavity and other parts; the two ends of the common rail pipe are respectively provided with an end cover, and sealing is achieved through a large-diameter sealing ring. A pressure release valve, a PCV valve, a pressure sensor and an oil inlet and outlet connector are installed on an outer cylinder of the common rail pipe, and all the components are connected with the common rail pipe in a sealed mode through small-diameter sealing rings. The circulation block is installed on the end cover, and when the circulation block is opened, the common rail cavity can be communicated with the outside, and the flushing function is achieved. According to the invention, the circulating cleaning function can be realized, and the leakage detection and prevention effect is improved.

Description

Technical Field

[0001] The invention relates to a fuel injection system for a marine diesel engine, in particular to a leakage-proof flushable circulating heavy oil common rail. Background Art

[0002] With the continuous development of the shipbuilding industry, there are now more and higher requirements for ship diesel engines. As the "heart" of ship power, the diesel used by diesel engines is divided into light diesel and heavy diesel. Considering the economic requirements, more ships need diesel engines to be adaptable to heavy oil. The common rail fuel system of diesel engines has a high development potential, and more and more ship diesel engines tend to use the common rail fuel system. The common rail fuel system, as a key supporting component of the diesel engine, is directly related to the use of the diesel engine.

[0003] When a diesel engine burns heavy oil, long-term use will inevitably reduce the service life of the fuel system due to its high temperature, corrosiveness, and high impurities. Therefore, the common rail fuel system is required to be resistant to high temperatures and corrosion; of course, its cleanliness is also a major concern. In addition, the leakage of high-temperature and corrosive heavy oil will cause greater danger, so leakage prevention of the fuel system is also a key point of concern.

[0004] According to the actual use of common rail fuel system on board, ensuring the cleanliness of fuel system is one of the key points to improve the service life of the system. To improve the cleanliness of fuel system, we can start from improving the filtering of impurities and cleaning key components frequently. To prevent leakage, we can add detection methods according to the leakage points and even the locations where leakage may occur, so as to prevent leakage from the source.

[0005] Therefore, it is necessary to develop a leakage-proof flushable circulating heavy oil common rail. Summary of the invention

[0006] The purpose of the present invention is to provide a leak-proof flushable circulating heavy oil common rail, which can realize the circulating cleaning function and improve the leak detection and leak prevention effect.

[0007] The anti-leakage and flushable circulating heavy oil common rail of the present invention comprises a common rail pipe and a circulation block; The common rail pipe is provided with a rail pipe large diameter sealing surface, a rail pipe small diameter sealing surface and a common rail pipe leak detection hole, which are used to provide installation positions for the common rail cavity and other components; End covers are installed at both ends of the common rail pipe, and sealing is achieved through large-diameter sealing rings; The outer cylinder of the common rail pipe is equipped with a pressure relief valve, a PCV valve, a pressure sensor and an oil inlet and outlet joint, and each component is sealed and connected to the common rail pipe through a small-diameter sealing ring; The circulation block is mounted on the end cover, and when opened, the common rail cavity can be connected with the outside to achieve a flushing function.

[0008] Optionally, the rail pipe large diameter sealing surface is arranged at both ends of the common rail pipe, and is used to form a sealing ring belt with the large diameter sealing ring; The rail pipe small diameter sealing surface is arranged on the cylinder of the common rail pipe, and is used to form a sealing ring with the small diameter sealing ring; and the end cover and the common rail pipe are positioned by a cylindrical pin; a large diameter sealing ring is used to seal the end cover and the common rail pipe, and is positioned by a cylindrical pin. This sealing form is not greatly affected by external force impact and is conducive to leakage prevention; The common rail pipe leak detection holes are located at both ends of the common rail pipe. The common rail pipe leak detection holes are connected to the sealing section formed by the common rail pipe, the end cover and the large diameter sealing ring, and are used to detect the sealing performance of the large diameter sealing ring to eliminate leakage.

[0009] Optionally, the end cover is in the shape of a short cylinder, and is provided with an end cover sealing surface for forming a sealing ring belt with a large diameter sealing ring; The circulation block is provided with multiple circulation block ring grooves, forming a circulation oil groove with the end cover, and is equipped with an O-ring to form a double anti-leakage structure; The circulation block is also provided with a circulation hole and a circulation branch hole connecting the circulation oil tank and the circulation hole. When the circulation block is opened, the cleaning medium in the circulation oil tank is discharged after being collected in the circulation hole through the circulation branch hole. When there are heavy oil impurities in the common rail pipe that need to be cleaned, the circulation block is opened, and the flushing oil enters the circulation oil tank, and then the cleaning medium is discharged after being collected in the circulation hole through the circulation branch hole.

[0010] Optionally, it also includes: a transfer block for transferring the oil inlet and outlet joints, the PCV valve seat and the high-pressure plug; The adapter block, the sensor seat and the pressure relief valve seat are all provided with an adapter block sealing surface, an adapter block leak detection vertical hole and an adapter block leak detection horizontal hole; The adapter block is used to transfer the oil inlet and outlet joints, the PCV valve seat and the high-pressure plug; The sealing surface of the adapter block is used to form a sealing ring belt with the small-diameter sealing ring; The adapter block leak detection vertical hole and the adapter block leak detection horizontal hole are used to detect the sealing performance of the small-diameter sealing ring. Small-diameter sealing rings are used to seal between the adapter block and the common rail pipe, between the sensor seat and the common rail pipe, and between the pressure relief valve seat and the common rail pipe. This sealing form is not greatly affected by external force impact and is conducive to leak prevention. The high-pressure plug is used in conjunction with the inlet and outlet oil joints. When the inlet and outlet oil joints are not needed, the high-pressure plug is used to replace them.

[0011] Optionally, the number of the PCV valves is two or more. The PCV valve is a redundant design, and its function is to adjust the pressure in the common rail cavity to ensure that the pressure in the common rail cavity is a stable value. The PCV valve is installed on the PCV valve seat, and the number can be adjusted to two or three. The PCV valve seat is installed on the common rail pipe through an adapter block, and the adapter block and the common rail pipe are sealed by a small-diameter sealing ring. This sealing form is not greatly affected by external force impact and is conducive to leak prevention.

[0012] Optionally, the number of the pressure sensors is two or more. The pressure sensor is a redundant design, and its function is to monitor the pressure of the common rail cavity in real time. It is used in conjunction with the PCV valve. The pressure sensor is mounted on a sensor seat, and the number of sensor seats is also two. A small-diameter sealing ring is used to seal between the sensor seat and the common rail pipe. This sealing form is not greatly affected by external force impact and is conducive to leak prevention.

[0013] Optionally, the common rail pipe is further provided with a support seat surface parallel to the rail pipe small-diameter sealing surface, and a support seat is installed on the support seat surface for supporting the common rail pipe.

[0014] Optionally, the number of the support seats is four or more.

[0015] Beneficial effects of the present invention: (1) Realizing the circulation cleaning function: The present invention installs a circulation block on the end cover. When it is necessary to clean the heavy oil impurities in the common rail cavity, the circulation block can be opened to allow the cleaning medium to enter the circulation oil tank and be discharged through the circulation branch hole and the circulation hole. This design makes the cleaning of the common rail cavity simple and efficient. The circulation block ring groove and O-ring on the circulation block form a double anti-leakage structure, ensuring that the cleaning medium will not leak along the wall, thereby ensuring the smooth progress of the entire flushing cycle process.

[0016] (2) Improve the cleanliness and life of the fuel system: Regular cycle cleaning can effectively remove heavy oil deposits and attachments in the common rail cavity, thereby maintaining the cleanliness of the fuel system. Improved cleanliness helps reduce wear and failure rate of the fuel system, thereby extending the service life of the fuel system.

[0017] (3) Improve the leak detection and prevention effect: The present invention sets common rail leak detection holes at both ends of the common rail pipe, and connects with the sealing section formed by the common rail pipe, the end cover and the large-diameter sealing ring. This design makes the detection of sealing performance direct and effective. Once a leak occurs, it can be immediately reflected through the common rail leak detection hole. At the same time, the adapter block, the sensor seat and the pressure relief valve seat are all provided with leak detection vertical holes and leak detection horizontal holes for detecting the sealing performance of the small-diameter sealing ring. This dual leak detection mechanism greatly enhances the system's leak prevention capability.

[0018] (4) Enhanced system safety and stability: The pressure relief valve and pressure sensor in the present invention are both redundant designs, which enables the system to respond and adjust the pressure more quickly when a failure occurs, thereby ensuring the safety of the entire system. At the same time, through precise pressure control and leak detection mechanisms, it can be ensured that the system always maintains stable performance during operation.

[0019] In summary, the leak-proof flushable circulating heavy oil common rail provided by the present invention has shown significant technical effects in leak detection and prevention, circulating cleaning, improving cleanliness and life, and enhancing system safety and stability. These effects work together on the fuel system, so that its overall performance is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall top view of the leak-proof flushable circulating heavy oil common rail in the embodiment of the present application; Figure 2 This is an overall front view (cross-sectional view) of the leak-proof flushable circulating heavy oil common rail in the embodiment of the present application; Figure 3 This is a partial structural cross-sectional view of the common rail pipe in the embodiment of the present application; Figure 4 This is a partial enlarged view of the common rail pipe, large-diameter sealing ring, end cover and circulation block assembly in the embodiment of the present application; Figure 5 It is a cross-sectional view of the common rail pipe, small-diameter sealing ring and adapter block assembly in the embodiment of the present application; Description of reference numerals: 1-end cover; 2-large diameter sealing ring; 3-cylindrical pin; 4-common rail pipe; 5-universal adapter block; 6-high pressure plug; 7-O-ring; 8-inlet and outlet oil joints; 9-PCV valve seat; 10-PCV valve; 11-sensor seat; 12-pressure sensor; 13, pressure relief valve seat; 14-pressure relief valve; 15-adapter block sealing surface; 16-small diameter sealing ring; 17-adapter block leak detection vertical hole; 18-circulation block; 19-adapter block leak detection horizontal hole; 20-support seat; 21-common rail pipe leak detection hole; 22-circulation oil groove; 23-circulation branch hole; 24-circulation hole; 25-circulation block ring groove; 26-end cover sealing surface; 27-rail pipe large diameter sealing surface; 28-rail pipe small diameter sealing surface; 29-support seat surface. DETAILED DESCRIPTION

[0021] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0022] like Figures 1 to 5As shown, in an embodiment of the present application, a leak-proof and flushable circulating heavy oil common rail includes a common rail pipe 4 and a circulation block 18. The common rail pipe 4 is provided with a rail pipe large-diameter sealing surface 27, a rail pipe small-diameter sealing surface 28 and a common rail pipe leak detection hole 21, which are used to provide installation positions for the common rail cavity and other components. End covers 1 are respectively installed at both ends of the common rail pipe 4, and sealing is achieved by a large-diameter sealing ring 2. A pressure relief valve 14, a PCV valve 10, a pressure sensor 12 and an oil inlet and outlet joint 8 are installed on the outer cylinder of the common rail pipe 4, and each component is sealed and connected to the common rail pipe 4 through a small-diameter sealing ring 16. The circulation block 18 is installed on the end cover 1, and when opened, the common rail cavity can be connected to the outside world to achieve a flushing function.

[0023] like Figure 1 and Figure 2 As shown, in a possible embodiment, the pressure relief valve 14 is a single piece, and its function is to force the pressure in the common rail cavity to open and release the pressure in the common rail cavity when the pressure in the common rail cavity exceeds the target limit. The inlet and outlet oil joints 8 are used for the high-pressure fuel in and out of the common rail cavity, and the number is determined according to needs.

[0024] like Figure 2 , Figure 3 and Figure 4 As shown, in a possible embodiment, rail pipe large diameter sealing surfaces 27 are respectively provided at both ends of the common rail pipe 4, which are used to form a sealing ring belt with the large diameter sealing ring 2. The end cover 1 is designed as a short cylinder, and an end cover sealing surface 30 is provided on the end cover 1, which is used to form a sealing ring belt with the large diameter sealing ring 2. That is, the rail pipe large diameter sealing surface 27 of the common rail pipe 4 and the end cover sealing surface 26 of the end cover 1 are respectively sealed with the large diameter sealing ring 2 to form a sealed common rail cavity. Since the large diameter sealing ring 2 is used to seal between the end cover 1 and the common rail pipe 4, this sealing form is not greatly affected by external force impact, which is conducive to leakage prevention.

[0025] like Figure 4 As shown, in a possible embodiment, common rail leak detection holes 21 are respectively provided at both ends of the common rail pipe 4, and the common rail leak detection holes 21 are connected to the sealing section formed by the common rail pipe 4, the end cover 1 and the large diameter sealing ring 2. The sealing performance between the common rail pipe 4, the large diameter sealing ring 2 and the end cover 1 is detected through the common rail leak detection hole 21. When leakage occurs, it can be reflected in real time through the common rail leak detection hole 21; and this sealing form is not greatly affected by the coaxiality of the three, and the components are less affected by external force impact. Therefore, the purpose of leak detection and leakage prevention is achieved.

[0026] like Figure 2 As shown, in a possible embodiment, the pressure relief valve 14 is mounted on the pressure relief valve seat 13, the pressure sensor 12 is mounted on the sensor seat 11, the PCV valve 10 is mounted on the PCV valve seat 9, and the inlet and outlet oil joints 8, the PCV valve seat 9 and the high-pressure plug 6 are respectively mounted on the common rail pipe 4 through the adapter block 5.

[0027] like Figure 2, Figure 3 and Figure 5 As shown, in a possible embodiment, the adapter block 5, the sensor seat 11 and the pressure relief valve seat 13 are all provided with an adapter block sealing surface 15, an adapter block leak detection vertical hole 17 and an adapter block leak detection horizontal hole 19. Among them, the adapter block sealing surface 15 is used to form a sealing ring belt with the small-diameter sealing ring 16. A rail pipe small-diameter sealing surface 28 corresponding to the adapter block sealing surface 15 is provided on the common rail pipe 4, wherein the rail pipe small-diameter sealing surface 28 is used to form a sealing ring belt with the small-diameter sealing ring 16. A seal is formed by the adapter block sealing surface 15, the small-diameter sealing ring 16 and the rail pipe small-diameter sealing surface 28. The small-diameter sealing ring 16 is used to seal between the adapter block 5 and the common rail pipe 4, between the sensor seat 11 and the common rail pipe 4, and between the pressure relief valve seat 13 and the common rail pipe 4. This sealing form is not greatly affected by external force impact and is conducive to leak prevention. The high-pressure plug 6 is used in conjunction with the oil inlet and outlet joints 8, and is used to replace the oil inlet and outlet joints 8 when the oil inlet and outlet joints 8 are not needed. The adapter block leak detection vertical hole 17 and the adapter block leak detection horizontal hole 19 are used to detect the sealing performance of the small-diameter sealing ring 16. Among them, the lower end of the adapter block leak detection vertical hole 17 extends downward to the adapter block sealing surface 15, and the adapter block leak detection horizontal hole 19 is connected to the adapter block leak detection vertical hole 17. The sealing between the adapter block 5, the small-diameter sealing ring 16 and the common rail pipe 4, the sealing between the sensor seat 11, the small-diameter sealing ring 16 and the common rail pipe 4, and the sealing between the pressure relief valve seat 13, the small-diameter sealing ring 16 and the common rail pipe 4 can all be detected through the adapter block leak detection vertical hole 17 and the adapter block leak detection horizontal hole 19 on each. When leakage occurs, the leaked oil is directly reflected in real time through the leak detection transverse hole 19 of the adapter block; and this sealing form is not greatly affected by the coaxiality of the three, and the components are less affected by external force impact, thus achieving the purpose of leak detection and leakage prevention.

[0028] like Figure 4 As shown, in a possible embodiment, the circulation block 18 is provided with a plurality of circulation block annular grooves 25, which form a circulation oil groove 22 with the end cover 1, and are equipped with an O-ring 7 to form a double anti-leakage structure. The circulation block 18 is also provided with a circulation hole 24, and a circulation branch hole 23 connecting the circulation oil groove 22 and the circulation hole 24. When the circulation block 18 is opened, the cleaning medium in the circulation oil groove 22 is collected in the circulation hole 24 through the circulation branch hole 23 and then discharged. When there are heavy oil impurities in the common rail pipe 4 that need to be cleaned, the circulation block 18 is opened, and the flushing oil enters the circulation oil groove 22, and then the cleaning medium is discharged by converging into the circulation hole 24 through the circulation branch hole 23.

[0029] In a possible embodiment, when the leak-proof flushable circulating heavy oil common rail is working, high-pressure fuel is introduced into and out of the common rail cavity through the oil inlet and outlet joints 8; at this time, the circulation block 18 installed on the end cover 1 is closed, and the entire common rail is in a normal working mode, and the pressure in the common rail cavity is reflected in real time through the pressure sensor 12, and adjusted to reach the target pressure value through the PCV valve 10. When a fault occurs and the pressure in the common rail cavity exceeds the target limit, the pressure relief valve 14 will be forced to open to release the pressure to ensure the safety of the entire common rail.

[0030] like Figure 1 and Figure 2 As shown, in a possible embodiment, the PCV valve 10 is a redundant design, and two or three PCV valves 10 can be designed. This multi-point control method makes it easier to control the pressure stability in the common rail cavity. The pressure sensor 12 is also a redundant design, and two pressure sensors 12 can be designed. In this way, at least one pressure sensor 12 can work normally, and the system can operate normally, further improving the safety and stability of the common rail.

[0031] The leak-proof flushable circulating heavy oil common rail can use heavy oil as a medium. Since the heavy oil medium has many characteristics that can easily affect the operation of the fuel system, one of them is that there are many and complex impurities. If the fuel system uses heavy oil for a long time, heavy oil impurities will inevitably be deposited, affecting the cleanliness of the fuel system and thus affecting the life of the fuel system. Among them, the common rail is a component of the fuel system. When heavy oil is accumulated in the common rail cavity, heavy oil deposits and attachments will be generated. At the same time, if the fuel system is shut down urgently and the heavy oil in use is not switched to light oil in time, the heavy oil will solidify and accumulate in the common rail cavity over time. Based on the above possible situations, a method for heavy oil circulation and impurity cleaning and discharge is provided in the embodiment of the present application, which is specifically: like Figure 2 and Figure 4 As shown, when heavy oil solidifies in the common rail cavity or impurities and sediments in the common rail cavity need to be cleaned, a cleaning medium with a certain pressure is introduced from the oil inlet and outlet joints 8, and it can be introduced from multiple points to increase the flushing efficiency; after the flushing is completed, the cleaning medium will enter the circulating oil tank 22 from the common rail cavity, and the circulation block 18 is opened at this time, and the cleaning medium in the circulating oil tank 22 is finally discharged through the circulation branch hole 23 to the circulation hole 24. In this flushing process, the circulation block annular groove 25 on the small-diameter cylinder of the circulation block 18 is used to reduce the leakage of the cleaning medium in the circulating oil tank 22 along the wall surface, and the O-ring 7 further prevents the cleaning medium from leaking along the wall surface, thereby forming a double anti-leakage structure to ensure the smooth progress of the entire flushing cycle process.

[0032] like Figure 2As shown, in a possible embodiment, the end cover 1 is accurately positioned between the cylindrical pin 3 and the common rail tube 4, so that the circulation block 18 installed on the end cover 1 is in a low position, the cleaning medium of the entire common rail is introduced at a high position and discharged at a low position, and is introduced from multiple points and discharged in two directions, thereby improving the flushing cycle efficiency.

[0033] like Figure 2 and Figure 3 As shown, in a possible embodiment, the common rail pipe 4 is further provided with a support seat surface 29 parallel to the rail pipe small diameter sealing surface 28 , and a support seat 20 is installed on the support seat surface 29 for supporting the common rail pipe 4 .

[0034] like Figure 2 As shown, in a possible embodiment, the number of the support seats 20 is four or more, and their positions can be adjusted as needed.

[0035] In a possible embodiment, the rail pipe large diameter sealing surface 27 and the end cover sealing surface 30 are both of relatively small roughness and relatively large hardness, so as to form a sealing ring with the large diameter sealing ring 2. The rail pipe small diameter sealing surface 28 can be determined according to demand, and the rail pipe small diameter sealing surface 28 has relatively small roughness and relatively large hardness, so as to form a sealing ring with the small diameter sealing ring 16. The connection block sealing surface 15 has relatively small roughness and relatively large hardness, so as to form a sealing ring with the small diameter sealing ring 16.

[0036] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A leak-proof flushable heavy oil common rail, characterized in that: It includes a common rail pipe (4) and a circulation block (18); The common rail pipe (4) is provided with a rail pipe large diameter sealing surface (27), a rail pipe small diameter sealing surface (28) and a common rail pipe leak detection hole (21), which are used to provide installation positions for the common rail cavity and other components; End covers (1) are respectively installed at both ends of the common rail pipe (4), and sealing is achieved through a large-diameter sealing ring (2); The outer cylinder of the common rail pipe (4) is equipped with a pressure relief valve (14), a PCV valve (10), a pressure sensor (12) and an oil inlet and outlet joint (8), and each component is sealed and connected to the common rail pipe (4) via a small-diameter sealing ring (16); The circulation block (18) is mounted on the end cover (1) and can connect the common rail cavity with the outside when opened, thereby achieving a flushing function.

2. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: The rail pipe large diameter sealing surfaces (27) are arranged at both ends of the common rail pipe (4) and are used to form a sealing ring belt with the large diameter sealing ring (2); The rail pipe small diameter sealing surface (28) is arranged on the cylinder of the common rail pipe (4) and is used to form a sealing ring with the small diameter sealing ring (16), and the end cover (1) and the common rail pipe (4) are also positioned by a cylindrical pin (3); The common rail pipe leak detection holes (21) are located at both ends of the common rail pipe (4); the common rail pipe leak detection holes (21) are connected to a sealing section formed by the common rail pipe (4), the end cover (1) and the large-diameter sealing ring (2), and are used to detect the sealing performance of the large-diameter sealing ring (2).

3. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: The end cover (1) is in the shape of a short cylinder and is provided with an end cover sealing surface (30) for forming a sealing ring with the large diameter sealing ring (2); The circulation block (18) is provided with a plurality of circulation block annular grooves (25) to form a circulation oil groove (22) with the end cover (1), and is provided with an O-ring (7) to form a double anti-leakage structure; The circulation block (18) is further provided with a circulation hole (24) and a circulation branch hole (23) communicating with the circulation oil groove (22) and the circulation hole (24). When the circulation block (18) is opened, the cleaning medium in the circulation oil groove (22) is collected in the circulation hole (24) through the circulation branch hole (23) and then discharged.

4. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: Also includes: An adapter block (5) for connecting the oil inlet and outlet joints (8), the PCV valve seat (9) and the high-pressure plug (6); The adapter block (5), the sensor seat (11) and the pressure relief valve seat (13) are all provided with an adapter block sealing surface (15), an adapter block leak detection vertical hole (17) and an adapter block leak detection horizontal hole (19); The adapter block sealing surface (15) is used to form a sealing ring with a small diameter sealing ring (16); The adapter block leak detection vertical hole (17) and the adapter block leak detection horizontal hole (19) are used to detect the sealing performance of the small-diameter sealing ring (16).

5. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: The number of the PCV valves (10) is two or more.

6. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: The number of the pressure sensors (12) is two or more.

7. The anti-leakage flushable circulating heavy oil common rail according to claim 1, characterized in that: The common rail pipe (4) is also provided with a support seat surface (29) parallel to the rail pipe small diameter sealing surface (28), and a support seat (20) is installed on the support seat surface (29) for supporting the common rail pipe (4).

8. The anti-leakage flushable circulating heavy oil common rail according to claim 7, characterized in that: The number of the support seats (20) is four or more.

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