An electronically controlled fuel cut-off valve for a diesel engine

Abstract

The utility model relates to diesel engine technical field discloses a kind of diesel engine electric control oil cut valve, including valve body and pilot head, the valve port of valve body is inserted into the lower end of pilot head, the outer side of lower end of pilot head is equipped with cover plate, the bottom of cover plate is equipped with multiple bolts, the valve port around of valve body is equipped with the screw hole corresponding with bolt, the pilot head is connected with valve body by bolt on cover plate and screw hole on valve body, recess is equipped on the valve body below cover plate, sealing ring is equipped in recess. The utility model changes the external bolt connection of existing thread screw-in type connection, sealing ring and bolt are used to seal and fix pilot head and valve body, reduce the generation of debris, at the same time, set up filter screen in oil inlet and oil outlet, avoid the debris into oil circuit and diesel engine, avoid the debris to block oil circuit or influence diesel engine operation.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine technology, specifically to an electronically controlled fuel cut-off valve for diesel engines. Background Technology

[0002] The electronically controlled fuel cut-off valve is used to control the opening and closing of the diesel engine's fuel circuit, enabling it to limit the fuel supply when the diesel engine starts and cut off the fuel circuit when the engine stops.

[0003] The existing electronically controlled fuel cut-off valve has a complex structure. The pilot head is directly screwed into the valve body through threads and washers. During installation and use, rubber and metal shavings are easily generated, which can enter the oil circuit. Especially when used in some models with high cleanliness requirements, it can easily clog the oil circuit and affect the normal fuel supply of the diesel engine. Utility Model Content

[0004] The technical problem this invention aims to solve is that existing electronically controlled oil shut-off valves are prone to generating rubber or metal debris, resulting in low cleanliness and affecting the normal operation of the oil circuit.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide an electronically controlled fuel cut-off valve for a diesel engine, including a valve body and a pilot head. The valve body has an oil inlet and an oil outlet at both ends, and a valve port at the upper end of the valve body. The oil outlet is connected to the valve port through an oil passage inside the valve body. The oil inlet is connected to the valve port through a short pipe. The lower end of the pilot head is inserted into the valve port of the valve body. A cover plate is provided on the outer side of the lower end of the pilot head. Multiple bolts are provided at the bottom of the cover plate. The valve port of the valve body is provided with screw holes corresponding to the bolts. The pilot head is connected to the valve body through the bolts on the cover plate and the screw holes on the valve body. A groove is provided on the valve body below the cover plate, and a sealing ring is provided in the groove.

[0006] Optionally, the pilot head includes a stationary iron core and a moving iron core. The lower end of the moving iron core is connected to a valve head via a connecting post. A spring is connected between the outside of the valve head and the outside of the moving iron core. The valve head is located in the valve port. The stationary iron core is located above the moving iron core. A coil is wrapped around the outside of the stationary iron core and the moving iron core. The lower end of the coil contacts the cover plate. The upper end of the stationary iron core extends out of the coil and is connected to a nut.

[0007] Optionally, a sealing gasket is provided at the bottom of the valve head.

[0008] Optionally, both the oil inlet and the oil outlet are equipped with filter screens, which are fixed to the oil inlet and the oil outlet respectively by retaining rings.

[0009] Optionally, the valve body is provided with a sensor mounting hole that communicates with the oil circuit.

[0010] In summary, this utility model replaces the existing threaded screw-in connection with an external bolt connection. The pilot head and valve body are sealed and fixed by the sealing ring and bolts, reducing the generation of debris. At the same time, filters are installed at the oil inlet and outlet to prevent debris from entering the oil circuit and diesel engine, thus preventing debris from clogging the oil circuit or affecting the operation of the diesel engine. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the electronically controlled fuel cut-off valve for diesel engines according to this utility model.

[0012] Figure 2 This is a schematic diagram of the moving iron core structure of this utility model;

[0013] In the diagram: 1. Valve body; 2. Pilot head; 3. Oil inlet; 4. Oil outlet; 5. Cover plate; 6. Sealing ring; 7. Stationary iron core; 8. Moving iron core; 9. Valve head; 10. Spring; 11. Coil; 12. Nut; 13. Filter screen; 14. Sensor mounting hole. Detailed Implementation

[0014] The following combination Figure 1-2 The present invention will be described in further detail below.

[0015] This utility model discloses an electronically controlled fuel cut-off valve for a diesel engine, referring to... Figure 1 The valve body includes a valve body 1 and a pilot head 2. The valve body 1 has an oil inlet 3 and an oil outlet 4 at both ends. The upper end of the valve body 1 has a valve port. The oil outlet 4 is connected to the valve port through the oil passage inside the valve body 1. The oil inlet 3 is connected to the valve port through a short pipe. The lower end of the pilot head 2 is inserted into the valve port of the valve body 1. The lower outer side of the pilot head 2 is provided with a cover plate 5. The bottom of the cover plate 5 is provided with multiple bolts. The valve port of the valve body 1 is provided with screw holes corresponding to the bolts. The pilot head 2 is connected to the valve body 1 through the bolts on the cover plate 5 and the screw holes on the valve body 1. The valve body 1 below the cover plate 5 is provided with a groove, and a sealing ring 6 is provided in the groove. The valve body 1 is provided with a sensor mounting hole 14 that communicates with the oil passage.

[0016] Specifically, the cover plate 5 is fixed to the valve body 1 by bolts and spring sealing ring 6 outside the valve body 1. The sealing ring 6 is pressed inside the valve body 1. This fixing method avoids the debris that is easily generated when the original valve body is tightened by threads.

[0017] In a further implementation, refer to Figure 2 The pilot head 2 includes a stationary iron core 7 and a moving iron core 8. The lower end of the moving iron core 8 is connected to a valve head 9 via a connecting post. A spring 10 is connected between the outside of the valve head 9 and the outside of the moving iron core 8. The valve head 9 is located in the valve port. The stationary iron core 7 is located above the moving iron core 8. A coil 11 is wrapped around the outside of the stationary iron core 7 and the moving iron core 8. The lower end of the coil 11 contacts the cover plate 5. The upper end of the stationary iron core 7 extends out of the coil 11 and is connected to a nut 12. The nut 12 is used to fix the coil 11. A sealing gasket is provided at the bottom of the valve head 9.

[0018] Specifically, the lower end of the moving iron core 8 is connected to the valve head 9 via a connecting post. The circumference of the connecting post is smaller than that of the moving iron core 8 and the valve head 9, which can reduce the overall weight of the pilot head 2 and improve sensitivity. A power connector extends from the outside of the coil 11 for connection to an external power source. The power connector is a two-pin connector, such as a two-core 282104-1, which is low-cost and can save costs.

[0019] In a further implementation, refer to Figure 1 Both the oil inlet 3 and the oil outlet 4 are equipped with filter screens 13, which are fixed to the oil inlet 3 and the oil outlet 4 by retaining rings respectively.

[0020] Specifically, the filter 13 can effectively prevent foreign objects from entering, and the retaining ring can prevent the filter 13 from falling off.

[0021] In use, the pilot head 2 is fixed to the valve body 1 with bolts, the sensor is installed in the sensor mounting hole 14, and then the power supply is connected through the power connector. When the coil 11 outside the pilot head 2 is energized, it is equivalent to an electromagnet. The valve head 9 can be raised or lowered through the moving iron core 8, thereby controlling the opening and closing of the valve port and realizing the functions of oil intake and oil circuit cut-off.

[0022] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A diesel engine electronically controlled fuel cut-off valve, characterized in that, The valve body (1) includes a valve body (1) and a pilot head (2). The valve body (1) has an oil inlet (3) and an oil outlet (4) at both ends. The valve body (1) has a valve port at the upper end. The oil outlet (4) is connected to the valve port through the oil passage inside the valve body (1). The oil inlet (3) is connected to the valve port through a short pipe. The lower end of the pilot head (2) is inserted into the valve port of the valve body (1). The lower outer side of the pilot head (2) is provided with a cover plate (5). The bottom of the cover plate (5) is provided with multiple bolts. The valve port of the valve body (1) is provided with screw holes corresponding to the bolts. The pilot head (2) is connected to the valve body (1) through the bolts on the cover plate (5) and the screw holes on the valve body (1). The valve body (1) below the cover plate (5) is provided with a groove, and a sealing ring (6) is provided in the groove.

2. The diesel engine electronic fuel cut-off valve according to claim 1, characterized in that, The pilot head (2) includes a stationary iron core (7) and a moving iron core (8). The lower end of the moving iron core (8) is connected to a valve head (9) via a connecting post. A spring (10) is connected between the outside of the valve head (9) and the outside of the moving iron core (8). The valve head (9) is located in the valve port. The stationary iron core (7) is located above the moving iron core (8). The stationary iron core (7) and the moving iron core (8) are wrapped with a coil (11). The lower end of the coil (11) contacts the cover plate (5). The upper end of the stationary iron core (7) extends out of the coil (11) and is connected to a nut (12).

3. The diesel engine electronic fuel cut-off valve according to claim 2, characterized in that, The valve head (9) is provided with a sealing gasket at the bottom.

4. The diesel engine electronic fuel cut-off valve according to claim 1, characterized in that, Both the oil inlet (3) and the oil outlet (4) are equipped with filter screens (13), which are fixed to the oil inlet (3) and the oil outlet (4) respectively by retaining rings.

5. The diesel engine electronic fuel cut-off valve according to claim 4, characterized in that, The valve body (1) is provided with a sensor mounting hole (14) that communicates with the oil circuit.

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