A fuel return structure of a fuel injection pump

Abstract

The utility model belongs to the technical field of oil return structure, specifically, a fuel oil return structure of a fuel injection pump, comprising a bottom plate; a pressure relief mechanism is arranged on the top side of the bottom plate, an adjusting mechanism is arranged on the top side of the pressure relief mechanism, a cooling mechanism is arranged on one end of the top side of the bottom plate, the pressure relief mechanism comprises a fuel injection pipe joint, a cylinder is fixed on the top side of the fuel injection pipe joint, a piston is slidably mounted on the inner side of the cylinder, and a spring is fixedly connected between the piston and a limit plate, an oil delivery pipe is fixed on the circumferential surface of the cylinder, and an oil storage tank is fixed on one end of the oil delivery pipe, when the pressure inside the return oil pipe is too high, it pushes the piston inside the cylinder to move and compresses the spring, when the piston moves to the top side of the oil delivery pipe, the high-temperature and high-pressure fuel inside the return oil pipe is transported to the inner side of the oil storage tank, when the pressure inside the return oil pipe is reduced, the spring pushes the piston to reset, thereby ensuring the normal operation of the oil return structure, and solving the problem that the pressure of the refluxed fuel is relatively large and cannot be processed in time.

Description

Technical Field

[0001] The utility model relates to the technical field of oil return structures, in particular to a fuel oil return structure of a fuel injection pump. Background Art

[0002] The fuel injection pump is one of the important components of a car diesel engine. The fuel injection pump, speed governor and other components constitute the fuel injection pump assembly. The oil return structure of the fuel injection pump can effectively reduce fuel waste and improve its utilization rate, thereby reducing the vehicle operating cost.

[0003] A fuel return structure of a fuel injection pump and a fuel injector with announcement number CN220395875U is provided with a connecting seat as the main body, an oil return structure assembly is arranged on the top of the outer side of the connecting seat, a monitoring component is arranged on the outer side of the collecting return pipe, and a heat dissipation group is arranged on the side of the collecting return pipe. The return oil pressure on the inner side of the collecting return pipe is monitored by a hydraulic sensor, and the return oil flow on the inner side of the collecting return pipe is monitored with the cooperation of the flow sensor, so as to facilitate the discovery of problems and timely handle the fuel pump return structure. At the same time, the heat dissipation fins can assist in the heat dissipation of the high-temperature fuel on the inner side of the collecting return pipe, thereby improving the safety of the oil return assembly when in use.

[0004] There are still problems in the fuel return structure of the fuel injection pump and injector described above. During the use of the fuel return structure, if the temperature and pressure of the refluxed fuel are high when the vehicle is running, it will not be possible to process it in time, resulting in an increase in the temperature and pressure of the incoming fuel in the fuel tank, affecting the normal driving of the vehicle. Therefore, a fuel return structure of a fuel injection pump is proposed. Utility Model Content

[0005] In order to make up for the shortcomings of the prior art, during the use of the oil return structure on the market, if the temperature and pressure of the refluxed fuel are high when the vehicle is running, it will not be able to be processed in time, resulting in an increase in the temperature and pressure of the incoming oil in the fuel tank, affecting the normal driving of the vehicle. The utility model proposes a fuel return structure for a fuel injection pump.

[0006] The technical solution adopted by the utility model to solve its technical problem is: the fuel return structure of a fuel injection pump described in the utility model includes a base plate; a pressure relief mechanism is arranged on the top side of the base plate, an adjusting mechanism is arranged on the top side of the pressure relief mechanism, a cooling mechanism is arranged at one end of the top side of the base plate, and a fuel injection pipe joint is fixed on the top side of the base plate.

[0007] Preferably, the pressure relief mechanism includes an injection pipe joint, a cylinder is fixed on the top side of the injection pipe joint, and the cylinder is connected to the inner side of the injection pipe joint, a limit plate is slidably installed on the top end of the inner side of the cylinder, a piston is slidably installed on the inner side of the cylinder, and a spring is fixedly connected between the piston and the limit plate, an oil pipe is fixed on the circumferential surface of the cylinder, an oil storage tank is fixed at one end of the oil pipe, the oil storage tank is connected to the inner side of the cylinder, the oil pipe is located between the piston and the limit plate, one end of the injection pipe joint is connected to an oil return pipe by threaded cooperation, and a sealing ring is fixed at the contact position between the injection pipe joint and the oil return pipe, and the piston and the spring are used in cooperation, so that when the return oil pressure inside the return oil structure is too high, the high-temperature and high-pressure fuel can be delivered to the inner side of the oil storage tank for temporary storage, thereby reducing the pressure inside the return oil structure to ensure its normal operation.

[0008] Preferably, the adjustment mechanism includes a limit plate, a rotating seat is fixed at the center position of the top side of the limit plate, a threaded rod is rotatably installed on the inner side of the rotating seat, the threaded rod is rotatably inserted into the top end of the cylinder, a hexagonal stud is fixed to the top end of the threaded rod, and a cylinder is provided at one end of the top side of the base plate. By using the threaded rod in conjunction with the limit plate, the pressure required to trigger the pressure relief can be adjusted according to actual use, making the equipment more flexible and convenient to use.

[0009] Preferably, the cooling mechanism includes a cylinder, a heat dissipation pipe is fixed to the inside of the cylinder, one end of the heat dissipation pipe passes through the cylinder and is connected to the inside, a water pump is fixed to the bottom end of one side of the cylinder, and the output end of the water pump is connected to the inside of the cylinder, a water supply pipe is fixed to the input end of the water pump, a heat dissipation plate is fixed to one end of the water supply pipe, heat dissipation fins are fixed to the bottom side of the heat dissipation plate, a cavity is opened on the inside of the heat dissipation plate, a drain pipe is fixed to one end of the top side of the heat dissipation plate, one end of the drain pipe is connected to the inside of the cylinder, and by injecting liquid into the inside of the cylinder, when the fuel flows through the heat dissipation pipe, the heat is transferred to the coolant, thereby preventing the fuel temperature inside the fuel tank from rising.

[0010] The utility model is beneficial in that:

[0011] 1. The utility model adopts a structural design of a fuel return structure of a fuel injection pump, and by setting a pressure relief mechanism, when the pressure inside the return oil pipeline is too high, it pushes the piston inside the cylinder connected with it to move and compresses the spring. When the piston moves to the top side of the oil delivery pipe, the high-temperature and high-pressure fuel inside the return oil pipeline is delivered to the inside of the oil storage tank. After the pressure inside the return oil pipeline is reduced, the spring pushes the piston to reset, preventing the refluxed fuel from being delivered to the inside of the oil storage tank, ensuring the normal operation of the return oil structure, and solving the problem that the refluxed fuel pressure is high and cannot be processed in time.

[0012] 2. The utility model adopts a structural design of the fuel return structure of the fuel injection pump. By setting a cooling mechanism, the water pump is controlled to transport the coolant on the inner side of the heat sink to the inner side of the cylinder. At this time, when the returning fuel flows through the heat dissipation pipe, the heat is transferred to the coolant. After the temperature is increased, the coolant flows back to the inner side of the heat sink through the drain pipe. With the cooperation of the heat dissipation fins, the heat is dissipated into the air, thereby realizing the function of cooling the returning fuel, preventing it from increasing the oil temperature inside the fuel tank, and improving the safety of the return structure when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure;

[0015] Figure 2 It is a rear-view three-dimensional structural sectional view of the pressure relief mechanism;

[0016] Figure 3 To adjust the main view of the structure to provide a sectional view of the stereoscopic structure;

[0017] Figure 4 It is a cross-sectional view of the three-dimensional structure of the cooling mechanism when viewed from above;

[0018] Figure 5 It is a schematic diagram of the overall three-dimensional structure from a top view.

[0019] In the figure: 1. bottom plate; 2. injection pipe joint; 3. cylinder barrel; 4. piston; 5. limit plate; 6. spring; 7. oil pipe; 8. oil storage tank; 9. sealing ring; 10. oil return pipe; 11. rotating seat; 12. threaded rod; 13. hexagonal stud; 14. cylinder; 15. heat pipe; 16. water pump; 17. water pipe; 18. heat sink; 19. heat fins; 20. cavity; 21. drain pipe; 22. sealing cover; 23. block; 24. seat. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4 As shown, a fuel return structure of a fuel injection pump comprises a bottom plate 1; a pressure relief mechanism is arranged on the top side of the bottom plate 1, an adjusting mechanism is arranged on the top side of the pressure relief mechanism, a cooling mechanism is arranged at one end of the top side of the bottom plate 1, and a fuel injection pipe joint 2 is fixed on the top side of the bottom plate 1;

[0022] See also Figure 2 As shown, the pressure relief mechanism includes an injection pipe joint 2, a cylinder 3 is fixed on the top side of the injection pipe joint 2, and the cylinder 3 is connected to the inner side of the injection pipe joint 2, a limit plate 5 is slidably installed on the top of the inner side of the cylinder 3, a piston 4 is slidably installed on the inner side of the cylinder 3, and a spring 6 is fixedly connected between the piston 4 and the limit plate 5, an oil delivery pipe 7 is fixed on the circumferential surface of the cylinder 3, an oil storage tank 8 is fixed at one end of the oil delivery pipe 7, the oil storage tank 8 is connected to the inner side of the cylinder 3, the oil delivery pipe 7 is located between the piston 4 and the limit plate 5, one end of the injection pipe joint 2 is connected to an oil return pipe 10 through threaded cooperation, and the injection pipe A sealing ring 9 is fixed at the contact position between the joint 2 and the return oil pipe 10. During operation, when the temperature and pressure of the refluxed fuel are high and cannot be processed in time, through the structure of the pressure relief mechanism, when the pressure inside the return oil pipe 10 is too high, it pushes the piston 4 inside the cylinder 3 connected thereto to move and compresses the spring 6. When the piston 4 moves to the top side of the oil delivery pipe 7, the high-temperature and high-pressure fuel inside the return oil pipe 10 is transported to the inside of the oil storage tank 8. After the pressure inside the return oil pipe 10 decreases, the spring 6 pushes the piston 4 to reset to prevent the refluxed fuel from being transported to the inside of the oil storage tank 8, thereby ensuring the normal operation of the return oil structure.

[0023] See also Figure 3 As shown, the adjusting mechanism includes a limit plate 5, a rotating seat 11 is fixed at the center position of the top side of the limit plate 5, a threaded rod 12 is rotatably installed on the inner side of the rotating seat 11, the threaded rod 12 is rotatably inserted into the top end of the cylinder 3, a hexagonal stud 13 is fixed on the top of the threaded rod 12, and a cylinder 14 is provided at one end of the top side of the bottom plate 1; during operation, when encountering the problem that the pressure inside the oil return structure cannot be adjusted, the hexagonal stud 13 is rotated through the structure of the adjusting mechanism to drive the threaded rod 12 to rotate, thereby, with the cooperation of the rotating seat 11, the limit plate 5 is pushed to move up and down inside the cylinder 3, and the required telescopic length of the spring 6 is changed during pressure relief, thereby adjusting the triggering pressure required for pressure relief inside the oil return structure, making the equipment more flexible and convenient to use.

[0024] See also Figure 4As shown, the cooling mechanism includes a cylinder 14, a heat dissipation pipe 15 is fixed inside the cylinder 14, one end of the heat dissipation pipe 15 passes through the cylinder 14 and communicates with the inside, a water pump 16 is fixed at the bottom end of one side of the cylinder 14, and the output end of the water pump 16 is communicated with the inside of the cylinder 14, a water delivery pipe 17 is fixed at the input end of the water pump 16, a heat dissipation plate 18 is fixed at one end of the water delivery pipe 17, a heat dissipation fin 19 is fixed at the bottom side of the heat dissipation plate 18, a cavity 20 is opened inside the heat dissipation plate 18, a drainage pipe 21 is fixed at one end of the top side of the heat dissipation plate 18, and the drainage pipe 21 is fixed at one end of the top side of the heat dissipation plate 18. One end of the tube 21 is connected to the inner side of the cylinder 14; when working, when the temperature of the refluxed fuel is high, the water pump 16 is controlled to transport the coolant on the inner side of the heat sink 18 to the inner side of the cylinder 14 through the structure of the cooling mechanism. At this time, when the refluxed fuel flows through the heat sink 15, the heat is transferred to the coolant. After the temperature is increased, the coolant flows back to the inner side of the heat sink 18 through the drain pipe 21. With the cooperation of the heat sink fins 19, the heat is dissipated into the air, thereby realizing the function of cooling the refluxed fuel, preventing it from increasing the oil temperature inside the fuel tank, and improving the safety of the oil return structure when in use.

[0025] See also Figure 5 As shown, a sealing cover 22 is installed on the top side of the oil storage tank 8 through a pin shaft, a clamping block 23 is fixed at one end of the sealing cover 22, a clamping seat 24 is fixed on the side of the oil storage tank 8, and the clamping block 23 is buckled on the clamping seat 24; during operation, when the oil storage tank 8 is inconvenient to clean and maintain, the elastic clamping block 23 can be pulled out from one side of the clamping seat 24 through the structure of the sealing cover 22, so that the sealing cover 22 is opened, and the fuel inside can be taken out, and it can be cleaned and maintained to ensure the normal operation of the oil return structure.

[0026] Working principle: The fuel injection pump is one of the important components of a car diesel engine, wherein the fuel injection pump, the speed regulator and other components constitute the fuel injection pump assembly, and the oil return structure of the fuel injection pump can effectively reduce the waste of fuel and improve its utilization rate, thereby realizing the function of reducing the vehicle operation cost. During the use of the existing oil return structure, if the temperature and pressure of the refluxed fuel are high when the vehicle is running, it will not be able to be processed in time, resulting in an increase in the temperature and pressure of the incoming oil in the fuel tank, affecting the normal driving of the vehicle. In order to solve this problem, a pressure relief mechanism and a cooling mechanism are provided, and the fuel injection pipe joint 2 is connected to the oil return pipe 10 through threaded cooperation, and the hexagonal stud 13 is rotated to drive the threaded rod 12 to rotate, so that with the cooperation of the rotating seat 11, the limit plate 5 is pushed to move up and down inside the cylinder 3, and the required telescopic length of the spring 6 is changed during the pressure relief, thereby the inner side of the oil return structure is relieved. The triggering pressure required for the oil pressure is adjusted to an appropriate value. When the pressure inside the return oil pipeline 10 is too high, it pushes the piston 4 inside the cylinder 3 connected thereto to move and compresses the spring 6. When the piston 4 moves to the top side of the oil delivery pipe 7, the high-temperature and high-pressure fuel inside the return oil pipeline 10 is delivered to the inside of the oil storage tank 8. After the pressure inside the return oil pipeline 10 is reduced, the spring 6 pushes the piston 4 to reset to prevent the refluxed fuel from being delivered to the inside of the oil storage tank 8. The water pump 16 is controlled to deliver the coolant inside the heat sink 18 to the inside of the cylinder 14. At this time, when the return oil fuel flows through the heat pipe 15, the heat is transferred to the coolant. After the temperature is increased, the coolant flows back to the inside of the heat sink 18 through the drain pipe 21. With the cooperation of the heat sink fins 19, the heat is dissipated into the air, thereby realizing the function of cooling the refluxed fuel and preventing it from increasing the oil temperature inside the fuel tank, thereby solving the problem that the refluxed fuel pressure is high and cannot be processed in time.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A fuel return structure of a fuel injection pump, characterized in that: It comprises a bottom plate (1); a pressure relief mechanism is arranged on the top side of the bottom plate (1); an adjustment mechanism is arranged on the top side of the pressure relief mechanism; a cooling mechanism is arranged at one end of the top side of the bottom plate (1); and an injection pipe joint (2) is fixed on the top side of the bottom plate (1); The pressure relief mechanism comprises an injection pipe joint (2), a cylinder (3) is fixed on the top side of the injection pipe joint (2), and the cylinder (3) is connected to the inner side of the injection pipe joint (2), a limit plate (5) is slidably mounted on the top of the inner side of the cylinder (3), a piston (4) is slidably mounted on the inner side of the cylinder (3), and a spring (6) is fixedly connected between the piston (4) and the limit plate (5), an oil delivery pipe (7) is fixed on the circumferential surface of the cylinder (3), and an oil storage tank (8) is fixed at one end of the oil delivery pipe (7).

2. The fuel return structure of a fuel injection pump according to claim 1, characterized in that: The oil storage tank (8) is connected to the inner side of the cylinder barrel (3); the oil delivery pipe (7) is located between the piston (4) and the limit plate (5); one end of the oil injection pipe joint (2) is connected to the oil return pipe (10) through threaded fitting, and a sealing ring (9) is fixed at the contact position between the oil injection pipe joint (2) and the oil return pipe (10).

3. The fuel return structure of a fuel injection pump according to claim 2, characterized in that: The adjustment mechanism comprises a limit plate (5), a rotating seat (11) is fixed at the center position of the top side of the limit plate (5), and a threaded rod (12) is rotatably mounted inside the rotating seat (11).

4. The fuel return structure of a fuel injection pump according to claim 3, characterized in that: The threaded rod (12) is rotatably inserted into the top of the cylinder barrel (3), a hexagonal stud (13) is fixed to the top of the threaded rod (12), and a cylinder body (14) is provided at one end of the top side of the bottom plate (1).

5. The fuel return structure of a fuel injection pump according to claim 4, characterized in that: The cooling mechanism comprises a cylinder (14), a heat dissipation pipe (15) is fixed inside the cylinder (14), one end of the heat dissipation pipe (15) passes through the cylinder (14) and is connected to the inside, a water pump (16) is fixed at the bottom end of one side of the cylinder (14), and the output end of the water pump (16) is connected to the inside of the cylinder (14), a water delivery pipe (17) is fixed at the input end of the water pump (16), and a heat dissipation plate (18) is fixed at one end of the water delivery pipe (17).

6. The fuel return structure of a fuel injection pump according to claim 5, characterized in that: A heat dissipation fin (19) is fixed on the bottom side of the heat dissipation plate (18), a cavity (20) is provided on the inside of the heat dissipation plate (18), a drainage pipe (21) is fixed on one end of the top side of the heat dissipation plate (18), and one end of the drainage pipe (21) is connected to the inside of the cylinder (14).

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