A heavy oil engine with a dual circulation system

Abstract

The present invention provides a heavy oil engine with a dual circulation system, which relates to the technical field of mechanical design of internal combustion engines. The engine comprises an engine main body, a water supply tank, a radiator, a pressure valve assembly, an air pump, a cylinder block, a cylinder head, a small circulation water pipe and a water inlet pipe. The end of the engine main body is connected with a water pump assembly by bolts, and a double pulley is also connected to the engine main body by bolts. A large circulation water pipe and a water pump water inlet pipe are connected to a mechanism composed of a water supply tank and a radiator. By adding a raised buffer device and a certain proportion of in-cylinder water channel design and a water pump cover with a certain angle to a water channel structure, the cylinder temperature of the engine under various working conditions is accurately controlled. By designing a certain angle on the surface of the pressure valve cover and adding a disc spring design to the lower end of a thermostat pressure spring, the fluctuation of the water temperature and the water channel air pressure is adjusted, the requirement of circulating cooling water volume is met, the versatility and overall layout convenience are ensured, the engine works smoothly, and the service life of parts is extended.

Description

Technical Field

[0001] The present invention belongs to the technical field of internal combustion engine mechanical design, and more specifically, particularly relates to a heavy oil engine with a dual circulation system. Background Art

[0002] In today's power machinery field, the engine is the core power source, and its performance and reliability are crucial to the operation of various equipment. Among the many types of engines, heavy oil engines have higher requirements for performance and reliability due to the characteristics of their fuel and the special needs of their application scenarios.

[0003] Traditional engines are often equipped with a relatively simple single-cycle cooling method. This method has problems such as inaccurate temperature control and insufficient system stability when dealing with complex working conditions and high-load operation.

[0004] With the continuous advancement of technology and the increasing application scenarios of engines, the performance optimization and reliability improvement of heavy oil engines have become the focus of research. Especially in some fields with high requirements for power output and continuous operation, such as ships and heavy machinery, the traditional single-cycle system can no longer meet the stability requirements of the engine under different working conditions.

[0005] Therefore, it is an inevitable trend to improve the working performance and reliability of heavy oil engines and develop a heavy oil engine with a dual circulation system. This new type of engine can more effectively control the working temperature of the engine, improve the heat dissipation efficiency, and reduce the damage to the engine caused by excessively high or low temperatures, thereby ensuring that the engine can maintain a good operating state under various complex working conditions. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a heavy oil engine with a dual circulation system to solve the above problems.

[0007] A heavy oil engine with a dual circulation system, comprising an engine body, a water supply tank, a radiator, a pressure valve assembly, an air pump, a cylinder block, a cylinder head, a small circulation water pipe, a water inlet pipe and water inlet and outlet cooling pipelines, the end of the engine body is connected to the water pump assembly by bolts, the engine body is also connected to a double pulley by bolts, the mechanism composed of the water supply tank and the radiator is connected to a large circulation water pipe and a water pump water inlet pipe, the upper and lower surface ends of the engine body are respectively bolted to the engine water outlet pipe and the engine water inlet pipe, wherein a water pump belt is installed between the water pump assembly and the double pulley to realize transmission, the small circulation water pipe is connected by a clamp There is a thermostat, which is connected to the water pump assembly through a small circulating water pipe. The double pulley is covered with a protective cover structure. The inside of the bottom of the cylinder body is the cylinder cooling water channel. The water inlet pipe of the inlet and outlet water cooling pipe is installed at the lower end of the cylinder body, and the water outlet pipe is installed at the upper end of the cylinder head. The protective cover structure includes a cover plate, a side cover 1 and a side cover 2. The radiator is connected to the large circulating water pipe and the water pump inlet pipe through a clamp. The pressure valve assembly is connected to the engine outlet pipe through a small circulating water pipe. The pressure valve assembly is connected to the engine body at the end by bolts. The engine outlet pipe and the engine inlet pipe are connected by an inlet pipe clamp. The water supply tank is connected to the radiator with bolts.

[0008] The water pump assembly includes a hexagon socket bolt, a water pump pulley, a connecting flange, a hydraulic sliding bearing, a water pump bracket, a water pump sealing device, a water pump impeller, and a water pump housing, wherein the hydraulic sliding bearing and the water pump sealing device are sealed and fastened for installation, the water pump impeller and the end of the hydraulic sliding bearing are interference fit, the end face of the water pump sealing device is connected to the end face of the water pump housing by bolts, the connecting flange and the hydraulic sliding bearing are interference fit, the water pump pulley and the connecting flange are fixedly connected by hexagon socket bolts, the water pump bracket is connected to the water pump sealing device by hexagon socket bolts, the side of the water pump sealing device and the side of the water pump housing are both installed with O-rings, the water pump housing is connected with an internal circulation water return port, an engine water inlet, and a water tank water inlet, and the engine water inlet, the internal circulation water return port, and the water tank water inlet are cast together.

[0009] Preferably, the pressure valve assembly includes an air pump lubrication water pipe, an expansion tank water pipe, a pressure valve water inlet pipe, a pressure valve spring sealing device, and a small circulation water inlet pipe;

[0010] Wherein, the air pump lubrication water pipe is connected to the air pump.

[0011] Preferably, the thermostat includes a high-temperature outlet, an inlet, a valve body temperature control assembly, an expansion tank interface, a low-temperature outlet, and a disc spring;

[0012] Among them, the coolant enters the inlet, and the coolant temperature is judged by the valve body temperature control assembly. When the coolant temperature is lower than the maximum operating temperature of the engine, the valve body temperature control assembly opens downward, and the coolant flows out from the low-temperature outlet to complete a small cycle. When the coolant temperature is higher than the maximum operating temperature of the engine, the valve body temperature control assembly opens upward, and the coolant flows out from the high-temperature outlet to complete a large cycle.

[0013] Preferably, the inlet and outlet water cooling pipeline includes a coolant outlet pipe port, a fixing bolt, a buffer device, and a coolant inlet pipe port;

[0014] Among them, the buffer device for gathering the coolant is a semicircular arc structure with protrusions at both ends, with a plug hole for releasing residual gas, the coolant inlet pipe is connected to the water pump inlet pipe, and the fixing bolts fix the inlet and outlet water cooling pipelines on the machine body.

[0015] Preferably, the cylinder cooling water channel includes an intake side water channel, a cylinder head bolt, a scavenging side water channel, a cylinder bolt, an exhaust side water channel, an exhaust port, and a sealing groove;

[0016] Among them, the water inlet water channel structure of the cylinder block cooling water channel is located below the cylinder block, and enters each cylinder in a one-to-two form. The intake side water channel, exhaust side water channel, and scavenging side water channel are designed in an arc shape. The water outlet water channel structure of the cylinder block cooling water channel is arranged above the cylinder head, and is discharged from each cylinder head in a two-in-one form, converging the coolant to the pressure valve.

[0017] Preferably, a pair of limiting members are connected to both ends of the side cover one, and two sets are fixed to the inner bottom surface of the side cover one, and a notch is formed at the bottom of each set.

[0018] Preferably, both ends of the second side cover are provided with a pair of limit snap-in slots, and two sleeves are fixed to the inner wall of the second side cover. When the first side cover and the second side cover are combined into a circle of side cover, the two pairs of limit members are respectively engaged in the two pairs of limit snap-in slots.

[0019] Preferably, two upper bolts and two lower bolts are threadedly sleeved on the cover plate, the two upper bolts are respectively sleeved in two sets of sleeves, and the two lower bolts are respectively sleeved in two sleeves, the ends of the two upper bolts and the two lower bolts are connected to the cylinder shell, the side cover ring composed of side cover one and side cover two is fitted on the cylinder shell, the upper bolt is a structure with a thin end and a thick head, the lower bolt is a structure with the same diameter at the front and back, and the side cover two is welded to the cylinder shell.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention accurately controls the cylinder temperature of the engine under various working conditions by adding a raised buffer device and a certain proportion of in-cylinder water channel design and a water pump cover at a certain angle to the water channel structure. A certain water pump cover angle and an integrated design can prevent large and small circulating water flows from colliding with each other, thereby extending the service life.

[0022] 2. The present invention adjusts the fluctuation of water temperature and waterway air pressure by designing a certain angle on the surface of the pressure valve cover and adding a disc spring design to the lower end of the thermostat pressure spring. The thermostat always keeps the engine working at the optimal operating temperature, and the pressure valve is designed to remove residual gas.

[0023] 3. Meet the requirements of circulating cooling water volume, versatility, and convenience of overall layout, ensure stable operation of the engine, and extend the life of components.

[0024] 4. The protective cover structure is designed so that when inspecting, only the side cover needs to be removed for visual inspection and simple maintenance. The required operating space is very small and the applicability is good. When dismantling and repairing is required, the cover plate 54 is removed for maintenance, which is convenient for selecting the appropriate disassembly method according to the size and needs of the operating space, thereby providing convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a disassembled diagram of the water pump assembly in the present invention;

[0027] Figure 3 It is a schematic diagram of the disassembled structure of the pressure valve assembly in the present invention;

[0028] Figure 4 It is a schematic diagram of the internal structure of the thermostat in the present invention;

[0029] Figure 5 It is a structural schematic diagram of the cylinder cooling water channel in the present invention;

[0030] Figure 6 It is the internal structure diagram of the inlet and outlet water cooling pipelines in the present invention;

[0031] Figure 7 It is a schematic diagram of the overall structure of the water pump assembly of the present invention;

[0032] Figure 8 It is a schematic diagram of the overall structure of the pressure valve assembly of the present invention;

[0033] Fig. 9 It is a schematic diagram of the overall structure of the thermostat in the present invention;

[0034] Fig.10 It is a schematic diagram of the overall structure of the protective cover structure of the present invention;

[0035] Fig.11 It is a schematic diagram of the disassembled structure of the protective cover structure in the present invention;

[0036] Fig.12 It is a structural schematic diagram of the side cover 1 in the present invention.

[0037] In the figure, the corresponding relationship between the names of the components and the numbers of the accompanying drawings is as follows: 1. Engine water outlet pipe; 2. Engine water inlet pipe; 3. Dual pulley; 4. Engine body; 5. Water pump assembly; 6. Radiator; 7. Water supply tank; 8. Large circulation water pipe; 9. Water inlet pipe; 10. Pressure valve assembly; 11. Water pump inlet pipe; 12. Thermostat; 13. Water pump belt; 14. Small circulation water pipe; 15. Air pump; 16. Cylinder block; 17. Cylinder head; 18. Hexagon socket bolt; 19. Water pump pulley; 20. Connecting flange; 21. Hydraulic sliding bearing; 23. Water pump bracket; 24. Water pump sealing device; 25. O-ring; 26. Water pump impeller; 27. Engine water inlet; 28. Water tank inlet; 29. ​​Water pump housing; 30. Internal circulation water return port; 31. Air pump lubricating Water slide pipe; 32. Expansion tank water pipe; 33. Pressure valve water inlet pipe; 34. Pressure valve spring sealing device; 35. Small circulation water inlet pipe; 36. High temperature outlet; 37. Inlet; 38. Valve body temperature control assembly; 39. Expansion tank interface; 40. Low temperature outlet; 41. Disc spring; 42. Coolant outlet; 43. Fixing bolt; 44. Buffer device; 45. Plug hole; 46. Coolant inlet; 47. Inlet side water channel; 48. Cylinder head bolt; 49. Scavenging side water channel; 50. Cylinder body bolt; 51. Exhaust side water channel; 52. Exhaust port; 53. Sealing groove; 54. Cover plate; 55. Side cover one; 56. Upper bolt; 57. Lower bolt; 58. Kit; 59. Limiting piece; 60. Limiting bayonet; 61. Sleeve; 62. Side cover two. DETAILED DESCRIPTION

[0038] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] See also Figure 1-Figure 12 The present invention provides a heavy oil engine with a dual circulation system, including an engine body 4, a water supply tank 7, a radiator 6, a pressure valve assembly 10, an air pump 15, a cylinder block 16, a cylinder head 17, a small circulation water pipe 14, a water inlet pipe 9 and an inlet and outlet water cooling pipeline. The end of the engine body 4 is connected with a water pump assembly 5 by bolts, and a double pulley 3 is also connected to the engine body 4 by bolts. A large circulation water pipe 8 and a water pump inlet pipe 11 are connected to the mechanism composed of the water supply tank 7 and the radiator 6. The engine outlet pipe 1 and the engine inlet pipe 2 are respectively bolted to the ends of the upper and lower surfaces of the engine body 4. A water pump belt 13 is installed between the water pump assembly 5 and the double pulley 3 to realize transmission. The small circulation water pipe 14 is connected with a thermostat 12 by a clamp. The thermostat 12 is connected to the water pump assembly 5 through the small circulation water pipe 14. ，The double pulley 3 is covered with a protective cover structure. The interior of the bottom of the cylinder body 16 is a cylinder cooling water channel. The protective cover structure includes a cover plate 54, a side cover 1 55 and a side cover 2 62.

[0040] The radiator 6 is connected to the large circulating water pipe 8 and the water pump inlet pipe 11 through a clamp, the pressure valve assembly 10 is connected to the engine water outlet pipe 1 through a small circulating water pipe 14, the pressure valve assembly 10 is connected to the engine body 4 at the end through bolts, the engine water outlet pipe 1 and the engine water inlet pipe 2 are connected through a water inlet pipe 9 clamp, and the water supply tank 7 is bolted to the radiator 6.

[0041] The water pump assembly 5 includes a hexagon socket bolt 18, a water pump pulley 19, a connecting flange 20, a hydraulic sliding bearing 21, a water pump bracket 23, a water pump sealing device 24, a water pump impeller 26, and a water pump housing 29. The hydraulic sliding bearing 21 and the water pump sealing device 24 are sealed and fastened, the water pump impeller 26 and the end of the hydraulic sliding bearing 21 are interference fit, the end face of the water pump sealing device 24 is connected to the end face of the water pump housing 29 by bolts, and the connecting flange 20 and the hydraulic sliding bearing 2 The water pump pulley 19 and the connecting flange 20 are fixedly connected by the hexagon socket bolts 18, the water pump bracket 23 is connected to the water pump sealing device 24 by the hexagon socket bolts 18, the side of the water pump sealing device 24 and the side of the water pump housing 29 are both installed with O-rings 25, the water pump housing 29 is connected with the internal circulation water return port 30, the engine water inlet 27, and the water tank water inlet 28, and the engine water inlet 27, the internal circulation water return port 30, and the water tank water inlet 28 are cast together.

[0042] The pressure valve assembly 10 includes an air pump lubricating water pipe 31, an expansion water tank water pipe 32, a pressure valve water inlet pipe 33, a pressure valve spring sealing device 34, and a small circulation water inlet pipe 35, wherein the air pump lubricating water pipe 31 is connected to the air pump 15, the expansion water tank water pipe 32 is connected to the expansion water tank, the pressure valve water inlet pipe 33 works together with the pressure valve spring sealing device 34 to complete the discharge of residual gas in the waterway and the discharge of residual coolant, and finally completes the small circulation through the small circulation water inlet pipe 35, the air pump lubricating water pipe 31 is the air pump cooling pipeline, the air pump lubricating water pipe 31, the expansion water tank water pipe 32, the pressure valve water inlet pipe 33, the pressure valve spring sealing device 34, and the small circulation water inlet pipe 35 are five structures gathered on one component, a casting.

[0043] The thermostat 12 includes a high temperature outlet 36, an inlet 37, a valve body temperature control assembly 38, an expansion tank interface 39, a low temperature outlet 40, and a disc spring 41. ，Among them, the coolant enters the inlet 37, and the coolant temperature is determined by the valve body temperature control assembly 38. When the coolant temperature is lower than the maximum operating temperature of the engine, the valve body temperature control assembly 38 opens downward, and the coolant flows out from the low-temperature outlet 40 to complete a small cycle. When the coolant temperature is higher than the maximum operating temperature of the engine, the valve body temperature control assembly 38 opens upward, and the coolant flows out from the high-temperature outlet 36 to complete a large cycle.

[0044] The inlet and outlet water cooling pipelines include a coolant outlet pipe port 42, a fixing bolt 43, a buffer device 44, and a coolant inlet pipe port 46. Among them, the buffer device 44 for gathering the coolant is a semicircular arc structure with protrusions at both ends, and has a plug hole 45 for releasing residual gas. The coolant inlet pipe port 46 is connected to the water pump inlet pipe 11. The fixing bolt 43 fixes the inlet and outlet water cooling pipelines to the machine body. The fixing bolt 43 is a bolt for fixing the inlet and outlet water cooling pipelines. Because part of the water will flow out from the coolant outlet pipe port 42, and the pipe port is thin, in order to buffer the water pressure, the buffer device 44 is designed to be cast together.

[0045] The cylinder block cooling water channel includes an intake side water channel 47, a cylinder head bolt 48, a scavenging side water channel 49, a cylinder block bolt 50, an exhaust side water channel 51, an exhaust port 52, and a sealing groove 53; wherein, the water inlet water channel structure of the cylinder block cooling water channel is below the cylinder block 16, and enters each cylinder in a one-to-two form, the intake side water channel 47, the exhaust side water channel 51, and the scavenging side water channel 49 are designed in a 104° arc shape, and the water outlet water channel structure of the cylinder block cooling water channel is arranged above the cylinder head 17, and is discharged from each cylinder head in a two-in-one form, and the coolant is gathered to the pressure valve, the intake side water channel 47 is close to the intake port on the engine cylinder block, the scavenging side water channel 49 is close to the scavenging port on the engine cylinder block, and the exhaust side water channel 51 is close to the exhaust port on the engine cylinder block, the cylinder block and the cylinder head are connected by the cylinder head bolt 48, and the sealing groove 53 opened on the end surface of the cylinder block 16 and the cylinder head 17 seals the coolant.

[0046] A pair of stoppers 59 are connected to both ends of the side cover 1 55. Two sets 58 are fixed to the inner bottom surface of the side cover 1 55. A notch is opened at the bottom of each set 58. A pair of stopper slots 60 are opened at both ends of the side cover 2 62. Two sleeves 61 are fixed to the inner wall of the side cover 2 62. When the side cover 1 55 and the side cover 2 62 are combined into a circle of side covers, the two pairs of stoppers 59 are respectively engaged in the two pairs of stopper slots 60. Two upper bolts 56 and two upper bolts 56 are threadedly sleeved on the cover plate 54. The lower bolt 57 and the two upper bolts 56 are respectively sleeved in the two sets 58, and the two lower bolts 57 are respectively sleeved in the two sleeves 61. The ends of the two upper bolts 56 and the two lower bolts 57 are connected to the outer shell of the cylinder body 16. The side cover ring composed of the side cover 1 55 and the side cover 2 62 is fitted on the outer shell of the cylinder body 16. The upper bolt 56 has a thin end and a thick head structure, and the lower bolt 57 has a front and rear same diameter structure. The side cover 2 62 is welded to the outer shell of the cylinder body 16.

[0047] The cylinder cooling water channel, water pump assembly 5, thermostat 12, radiator 6 and pressure valve assembly 10 are connected by a reinforced material hose woven with cotton thread that is resistant to high temperature, pressure and corrosion. The water pump assembly 5 is installed above the four-cylinder side of the engine body 4. The water pump impeller 26 rotates the coolant from the radiator 6 water tank, and the coolant flows through the engine body water channel. The water inlet and outlet pipes of the cylinder body 16 and the cylinder head 17 are respectively installed below the cylinder body 16 and above the cylinder head 17. The water channel layout of the cylinder body 16 is closely designed around the intake side water channel 47, the exhaust side water channel 51, and the scavenging side water channel 49 with a 104° arc surface.

[0048] The pressure valve assembly 10 is installed at the uppermost part of the engine, higher than the water channel structure, the water pump assembly 5, and the thermostat 12. The pressure valve assembly 10 is used to detect the water pressure in the cooling pipeline, and to adjust the water pressure and the residual gas in the water channel. The thermostat 12 is installed between the water pump assembly 5 and the outlet pipe. The thermostat 12 is used to detect the fluctuation of the engine water temperature, accurately control the coolant temperature, and realize internal and external circulation. The thermostat 12 is connected to both the external circulation water channel of the radiator and the internal circulation water channel of the engine. Under normal engine temperature conditions, the large circulation switch is closed and the engine performs a small circulation. When the engine temperature is too high, the large circulation is opened to accelerate cooling, thereby realizing dual-circulation cooling of the engine cooling system and ensuring a good operating condition for the use of the engine.

[0049] The water pump assembly 5 is a Z101A cast aluminum structure. The end cover of the water pump housing 29 is at an angle of 45°-75° to the water pump impeller 26. It has three water inlets and outlets. The structure is fixedly connected to the water pump body, which can realize the circulation of cooling water at different angles and control the amount of water gathered in the water pump without violent impact.

[0050] The engine water inlet pipe 2 is a semicircular arc structure with raised ends and four residual air holes on the top. The engine water inlet pipe 2 is below the cylinder block 16 and enters each cylinder in a one-to-two form. The water channel structure is close to the intake port, exhaust port, and scavenging air port with an arc design of 104°. The water outlet water channel structure is arranged above the cylinder head 17 and is discharged from each cylinder head in a two-in-one form, gathering all the coolant into the pressure valve.

[0051] The pressure valve assembly 10 is a Y-shaped structure when viewed from above, with a pressure valve spring cover at the top, water inlets on the left and right, and a residual gas discharge port at the front. The inner cavity of the pressure valve cover is designed with a 15° slope, and the pressure valve cover is fixed at the bottom by bolts.

[0052] The thermostat 12 is a coolant circulation structure, which controls the melting point of large and small waxes by temperature. It has an inlet 37, a low-temperature outlet 40, a coolant inlet pipe 46, and an expansion tank interface 39 on the outside. There is a spring device for controlling water circulation inside, and the lower end of the spring is connected to the disc spring 41. When a certain temperature is reached, the wax melts, the spring is pressed down, and the disc spring 41 contracts, and the connection is tight, so as to achieve the effect of temperature control and constant pressure. By deflecting the two upper bolts 56 by a certain distance, the set 58 is separated from the thick end of the upper bolt 56. At this time, the set 58 is used to The notch at the end can pull side cover 1 55 upward away from side cover 2 62, so that the inside of the protective cover structure can be inspected and repaired from above without dismantling the entire protective cover structure. After removing the two upper bolts 56 and the two lower bolts 57, side cover 1 55 and cover plate 54 can be removed from side cover 2 62, so as to fully expose the inside of the protective cover structure. Side cover 1 55 can be removed alone or side cover 1 55 and cover plate 54 can be removed at the same time, so that the appropriate disassembly method can be selected according to the size and needs of the operating space, thereby providing convenience.

[0053] Working principle:

[0054] In the first step, a forced circulation water cooling system is adopted. The coolant enters the water channel of the engine body through a water pump. The coolant absorbs heat from the water channel wall and heats up, and then flows upward into the cylinder head water channel. After absorbing heat from the cylinder head water channel wall, the coolant is collected into the pressure valve. After reaching a certain pressure, the residual gas and liquid are released. After that, the coolant passes through the thermostat 12 to control the coolant temperature. The coolant flows into the radiator 6 through the radiator water inlet hose. In the radiator 6, the coolant dissipates heat to the air flowing around the radiator 6 and cools down. Finally, the coolant returns to the water pump through the radiator water outlet hose, and the cycle is repeated.

[0055] In the second step, when the engine cylinder temperature exceeds a certain limit, the thermostat 12 performs a large and small cycle. The small cycle is that the coolant enters the cooling water channel through the water pump, enters the cylinder 16 and the cylinder head 17, gathers at the pressure valve cover, passes through the expansion water tank and passes through the thermostat 12 to return to the water pump. The large cycle is that the coolant enters the cooling water channel through the water pump, enters the cylinder 16 and the cylinder head 17, gathers at the pressure valve cover, passes through the expansion water tank and passes through the thermostat 12. The disc spring 41 of the thermostat 12 opens, and the coolant flows into the external radiator 6, is cooled by the cooling air, and is input into the water pump again through the water outlet of the radiator 6.

[0056] In the third step, the coolant will be gathered through the pressure valve during the large and small circulation processes. At this time, the pressure valve will release the residual gas and liquid through the expansion of gas and water pressure fluctuations, stabilizing the smooth operation of the entire cooling system and stabilizing the engine's optimal working state.

[0057] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A heavy oil engine with a dual circulation system, characterized in that: The heavy oil engine comprises an engine body (4), a water supply tank (7), a radiator (6), a pressure valve assembly (10), an air pump (15), a cylinder block (16), a cylinder head (17), a small circulating water pipe (14), a water inlet pipe (9) and water inlet and outlet cooling pipelines. The end of the engine body (4) is connected to the water pump assembly (5) by bolts, and the engine body (4) is also connected to a double pulley (3) by bolts. The mechanism composed of the water supply tank (7) and the radiator (6) is connected to a large circulating water pipe (8) and a water pump water inlet pipe (11). The ends of the upper and lower surfaces of the engine body (4) are respectively connected to the engine water outlet pipe (1) and the engine water inlet pipe (2) by bolts. A water pump belt (13) is installed between the water pump assembly (5) and the double pulley (3) to realize transmission, a small circulating water pipe (14) is connected to a thermostat (12) by a clamp, and the thermostat (12) is connected to the water pump assembly (5) through the small circulating water pipe (14); The double pulley (3) is covered with a protective cover structure, the interior of the bottom of the cylinder body (16) is a cylinder cooling water channel, the water inlet pipe of the inlet and outlet water cooling pipes is installed at the lower end of the cylinder body (16), and the water outlet pipe is installed at the upper end of the cylinder cover (17); The protective cover structure comprises a cover plate (54), a side cover 1 (55) and a side cover 2 (62); The radiator (6) is connected to the large circulating water pipe (8) and the water pump water inlet pipe (11) via a clamp, the pressure valve assembly (10) is connected to the engine water outlet pipe (1) via a small circulating water pipe (14), the pressure valve assembly (10) is connected to the engine body (4) at the end via bolts, the engine water outlet pipe (1) and the engine water inlet pipe (2) are connected via a water inlet pipe (9) clamp, and the water supply tank (7) is connected to the radiator (6) via bolts; The water pump assembly (5) comprises a hexagon socket bolt (18), a water pump pulley (19), a connecting flange (20), a hydraulic sliding bearing (21), a water pump bracket (23), a water pump sealing device (24), a water pump impeller (26), and a water pump housing (29), wherein the hydraulic sliding bearing (21) and the water pump sealing device (24) are installed in a sealed and fastened manner, the water pump impeller (26) and the end of the hydraulic sliding bearing (21) are interference fit, the end face of the water pump sealing device (24) and the end face of the water pump housing (29) are connected by bolts, and the connecting flange (20) and the hydraulic sliding bearing (21) are connected in a sealed and fastened manner. 1) Interference fit, the water pump pulley (19) and the connecting flange (20) are fixedly connected by means of hexagon socket bolts (18), the water pump bracket (23) is connected to the water pump sealing device (24) by means of the hexagon socket bolts (18), the side of the water pump sealing device (24) and the side of the water pump housing (29) are both installed with O-rings (25), the water pump housing (29) is connected with an internal circulation water return port (30), an engine water inlet (27), and a water tank water inlet (28), and the three ports of the engine water inlet (27), the internal circulation water return port (30), and the water tank water inlet (28) are cast together.

2. A heavy oil engine with a dual circulation system as claimed in claim 1, characterized in that: The pressure valve assembly (10) includes an air pump lubrication water pipe (31), an expansion water tank water pipe (32), a pressure valve water inlet pipe (33), a pressure valve spring sealing device (34), and a small circulation water inlet pipe (35); Wherein, the air pump lubrication water pipe (31) is connected to the air pump (15).

3. A heavy oil engine with a dual circulation system as claimed in claim 2, characterized in that: The thermostat (12) includes a high temperature outlet (36), an inlet (37), a valve body temperature control assembly (38), an expansion tank interface (39), a low temperature outlet (40), and a disc spring (41); The coolant enters the inlet (37), and the coolant temperature is determined by the valve body temperature control assembly (38). When the coolant temperature is lower than the maximum operating temperature of the engine, the valve body temperature control assembly (38) opens downward, and the coolant flows out from the low-temperature outlet (40) to complete a small cycle. When the coolant temperature is higher than the maximum operating temperature of the engine, the valve body temperature control assembly (38) opens upward, and the coolant flows out from the high-temperature outlet (36) to complete a large cycle.

4. A heavy oil engine with a dual circulation system as claimed in claim 3, characterized in that: The inlet and outlet water cooling pipeline comprises a cooling liquid outlet pipe opening (42), a fixing bolt (43), a buffer device (44), and a cooling liquid inlet pipe opening (46); The buffer device (44) for collecting the coolant is a semicircular arc structure with protrusions at both ends, and is provided with a plug hole (45) for releasing residual gas. The coolant inlet pipe port (46) is connected to the water pump inlet pipe (11), and the fixing bolts (43) fix the inlet and outlet water cooling pipelines on the machine body.

5. A heavy oil engine with a dual circulation system as claimed in claim 4, characterized in that: The cylinder cooling water channel comprises an intake side water channel (47), a cylinder head bolt (48), a scavenging side water channel (49), a cylinder bolt (50), an exhaust side water channel (51), an exhaust port (52), and a sealing groove (53); The water inlet channel structure of the cylinder cooling water channel is located below the cylinder block (16) and enters each cylinder in a two-part form. The intake side channel (47), the exhaust side channel (51) and the scavenging side channel (49) are designed in a 104° arc shape. The water outlet channel structure of the cylinder cooling water channel is arranged above the cylinder head (17) and is discharged from each cylinder head in a two-in-one form to gather the coolant to the pressure valve.

6. A heavy oil engine with a dual circulation system as claimed in claim 5, characterized in that: A pair of stoppers (59) are connected to both ends of the side cover (55), and two sets (58) are fixed to the inner bottom surface of the side cover (55), and a notch is formed at the bottom of each set (58).

7. A heavy oil engine with a dual circulation system as claimed in claim 6, characterized in that: A pair of limit snap-in openings (60) are provided at both ends of the second side cover (62), and two sleeves (61) are fixed to the inner wall of the second side cover (62). When the first side cover (55) and the second side cover (62) are combined into a circle of side covers, the two pairs of limit members (59) are respectively engaged in the two pairs of limit snap-in openings (60).

8. A heavy oil engine with a dual circulation system as claimed in claim 7, characterized in that: The cover plate (54) is threadedly sleeved with two upper bolts (56) and two lower bolts (57). The two upper bolts (56) are sleeved in two sets (58) respectively, and the two lower bolts (57) are sleeved in two sleeves (61) respectively. The ends of the two upper bolts (56) and the two lower bolts (57) are connected to the outer shell of the cylinder body (16). The side cover ring composed of the side cover 1 (55) and the side cover 2 (62) is attached to the outer shell of the cylinder body (16). The upper bolt (56) is a structure with a thin end and a thick head. The lower bolt (57) is a structure with the same diameter at the front and rear. The side cover 2 (62) is welded to the outer shell of the cylinder body (16).

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