A restricted diesel engine fuel injector

Abstract

The utility model discloses a throttle type diesel engine fuel injection nozzle relates to diesel engine fuel injection nozzle technical field, including fuel injector body and oil inlet pipe, and the pipe body of oil inlet pipe is connected with the oil inlet, and the pipe body of oil inlet pipe is fixed with the adjusting box, and the middle part box body of adjusting box is equipped with first cavity, and the left and right sides of first cavity are provided with respectively the second cavity and third cavity of setting up in the box body of adjusting box, and the pipe body of oil inlet pipe is movably installed with piston block, and the box body of adjusting box is provided with throttle mechanism. The utility model discloses a throttle mechanism, under the action of adjusting box makes the lead screw and stepping motor all get the protection, is favorable for prolonging the service life of lead screw and stepping motor, and adopts stepping motor and drives the adjustment, changes from manual adjustment to electric adjustment, has greatly promoted the adjustment accuracy. And after throttle regulation is finished, through starting electric push rod and drives the descending of locking rod, can guarantee that piston block will not displace and influence throttle regulation.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine fuel injector technology, specifically a throttling diesel engine fuel injector. Background Technology

[0002] A diesel engine is an engine that burns diesel fuel to obtain energy. The fuel injector is an important component of a diesel engine. It is activated by an electromagnetic coil to generate suction, which lifts the needle valve and opens the injection hole. Fuel is then injected at high speed through the annular gap between the needle valve head and the injection hole.

[0003] Chinese Patent Publication No. CN218151211U discloses a throttling diesel engine injector, which includes an injector body. A needle valve body is installed at the lower end of the injector body via a threaded sleeve. An inlet pipe is provided on one side of the upper end of the injector body, with an inlet port at the upper part of the inlet pipe. A guide rod is slidably inserted at the center of one end of the inlet pipe. One end of the guide rod is connected to a limit plate, and the other end of the guide rod is connected to a piston block adapted to the inner diameter of the inlet pipe. A flow regulator is provided on the outside of one end of the inlet pipe. This throttling diesel engine injector, by setting a flow regulator, allows the guide rod to move the piston block by rotating the handle, so that the piston block controls the size of the inlet port, thereby controlling the amount of fuel injected and the amount of fuel supplied. It is easy to operate, and at the same time, by adjusting the amount of fuel injected, it plays a certain role in throttling.

[0004] However, the throttling diesel engine injector disclosed in the aforementioned patent still has certain shortcomings in practical applications. Adjusting the fuel intake requires turning a knob, but in diesel engines, the injector may be installed in an inaccessible location, making manual adjustment inconvenient and difficult to control in terms of precision. Furthermore, diesel engine injectors operate in high-temperature, high-pressure environments, and components such as the flow regulator and guide rod may be subject to fuel corrosion and wear. The injector lacks a protective structure to prevent fuel contamination. Moreover, after adjustment, there is no locking mechanism to lock the flow regulator; if the pressure in the fuel inlet pipe is too high, the piston block may shift. Utility Model Content

[0005] The purpose of this invention is to provide a throttling diesel engine injector to solve the problems mentioned in the background art, such as the inconvenience of controlling the adjustment accuracy when manually adjusting the existing throttling diesel engine injectors, the lack of a protective structure to prevent the flow regulator from being contaminated with oil, and the lack of a locking structure to lock the flow regulator.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a throttling diesel engine injector, comprising an injector body and an inlet pipe connected to the injector body, an inlet port connected to the inlet pipe body, an adjusting box fixed to the inlet pipe body, and the adjusting box located on the side of the inlet port away from the injector body, a first cavity is provided in the middle of the adjusting box, and a second cavity and a third cavity are respectively provided on the left and right sides of the first cavity. A piston block is movably installed in the inlet pipe body, and a sealing ring is fitted on the circumferential side wall of the piston block. A throttling mechanism is provided in the adjusting box body to drive the piston block to move.

[0007] Preferably, the throttling mechanism includes a stepper motor, a lead screw, and a moving block. The left and right ends of the lead screw pass through the two side walls of the first cavity via bearings. The stepper motor is installed in the cavity of the third cavity, and the output end of the stepper motor is connected to the right end of the lead screw via a coupling. The moving block is located in the cavity of the first cavity and is screwed onto the surface of the lead screw.

[0008] Preferably, the throttling mechanism further includes an adjusting rod and a second through hole. The second through hole is respectively opened on the left and right side walls of the second cavity. One end of the adjusting rod is fixedly installed on the left side wall of the moving block, and the other end of the adjusting rod movably passes through the cavity of the second through hole and the body of the oil inlet pipe and is fixedly connected to the left side wall of the piston block.

[0009] Preferably, the throttling mechanism further includes a locking wheel and a locking hole. The locking wheel is located in the cavity of the second cavity. The right side wall of the locking wheel is fixedly connected to the left end of the lead screw. The locking hole is evenly opened on the circumferential side wall of the locking wheel.

[0010] Preferably, the throttling mechanism further includes a fixed plate and an electric push rod, the fixed plate being fixedly installed on the top left wall of the regulating box, and the electric push rod being fixedly installed on the top inner wall of the fixed plate.

[0011] Preferably, the throttling mechanism further includes a locking rod and a first through hole. The locking rod is fixedly connected to the piston end of the electric push rod. The first through hole is opened in the top wall of the regulating box and communicates with the cavity of the second cavity. The locking rod is located directly above the first through hole and the locking wheel, and the locking rod is adapted to the cavity of the locking hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes a throttling mechanism to control the start of a stepper motor when throttling adjustment is needed. The stepper motor drives a lead screw to rotate, and under the limiting and guiding action of the second through-hole, a moving block moves to the right along the lead screw, thereby moving an adjusting rod. During this movement, the adjusting rod drives a piston block within the oil inlet pipe, sealing the connection between the oil inlet and the oil inlet pipe, thus achieving throttling. Furthermore, because the lead screw is located in the first cavity of the adjusting box and the stepper motor in the third cavity, both are protected by the adjusting box, avoiding exposure to the high-temperature, high-pressure, and easily contaminated working environment of the diesel engine injector. This extends the service life of both the lead screw and the stepper motor. Moreover, using a stepper motor for driving adjustment changes the adjustment from manual to electric, greatly improving adjustment accuracy. After the throttling adjustment is completed, the electric push rod is activated to drive the locking rod down and insert it into the locking hole on the surface of the locking wheel, thereby limiting and locking the lead screw so that it can no longer rotate. This ensures that the piston block will not be displaced and affect the throttling adjustment. When it is necessary to restart the stepper motor for adjustment, the electric push rod is controlled to raise the locking rod. Attached Figure Description

[0013] Figure 1 This is a first-view view and a partially enlarged structural schematic diagram of a throttling diesel engine injector according to the present invention; Figure 2 This is a partial cross-sectional view of the structure of a throttling diesel engine injector according to the present invention. Figure 3 This is a partial cross-sectional view of the structure of a throttling diesel engine injector according to the present invention. Figure 4 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0014] In the diagram: 1. Injector body; 2. Inlet pipe; 3. Inlet port; 4. Adjustment box; 5. Adjustment rod; 6. Fixing plate; 7. Electric push rod; 8. Locking rod; 9. First through hole; 10. Piston block; 11. Sealing ring; 12. First cavity; 13. Second cavity; 14. Third cavity; 15. Stepper motor; 16. Lead screw; 17. Moving block; 18. Second through hole; 19. Locking wheel; 20. Locking hole. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a throttling diesel engine injector, including an injector body 1 and an inlet pipe 2 connected to the injector body 1, an inlet port 3 connected to the pipe body of the inlet pipe 2, an adjusting box 4 bonded to the pipe body of the inlet pipe 2, and the adjusting box 4 located on the side of the inlet port 3 away from the injector body 1, a first cavity 12 opened in the middle of the adjusting box 4, a second cavity 13 and a third cavity 14 opened in the adjusting box 4 respectively on the left and right sides of the first cavity 12, a piston block 10 movably installed in the pipe body of the inlet pipe 2, a sealing ring 11 sleeved on the circumferential side wall of the piston block 10 to achieve sealing and prevent oil leakage, and a throttling mechanism is provided in the adjusting box 4 to drive the piston block 10 to move.

[0017] The throttling mechanism includes a stepper motor 15, a lead screw 16, and a moving block 17. The left and right ends of the lead screw 16 pass through the side walls of the first cavity 12 via bearings. The stepper motor 15 is installed in the third cavity 14, and its output end is connected to the right end of the lead screw 16 via a coupling. This allows the stepper motor 15 to drive the lead screw 16 to rotate. The moving block 17 is located in the first cavity 12 and is screwed onto the surface of the lead screw 16. The throttling mechanism also includes an adjusting rod 5 and a second through hole 18. The second through holes 18 are respectively opened on the left and right side walls of the second cavity 13. One end of the adjusting rod 5 is welded to the left side wall of the moving block 17, and the other end of the adjusting rod 5 movably passes through the cavity of the second through hole 18 and the oil inlet pipe 2, and is welded to the left side wall of the piston block 10. The throttling mechanism also includes a locking wheel 19 and a locking hole 20. The locking wheel 19 is located in the cavity of the second cavity 13. The right side wall of the locking wheel 19 is welded to the left end of the lead screw 16. The locking holes 20 are evenly distributed on the circumferential side wall of the locking wheel 19. The throttling mechanism also includes a fixing plate 6 and an electric push rod 7. The fixing plate 6 is welded to the top left wall of the regulating box 4. The electric push rod 7 is fixedly installed on the inner top wall of the fixing plate 6 by screws. The throttling mechanism also includes a locking rod 8 and a first through hole 9. The locking rod 8 is welded to the piston end of the electric push rod 7. The first through hole 9 is opened on the top wall of the regulating box 4 and communicates with the cavity of the second cavity 13. The locking rod 8 is located directly above the first through hole 9 and the locking wheel 19. The locking rod 8 is adapted to the cavity of the locking hole 20 so that the locking rod 8 can be inserted into the locking hole 20.

[0018] Working Principle: The throttling mechanism allows the stepper motor 15 to be started when throttling adjustment is needed. This drives the lead screw 16 to rotate. Under the limiting and guiding action of the second through hole 18, the moving block 17 moves to the right along the lead screw 16, thereby moving the adjusting rod 5. During this movement, the adjusting rod 5 drives the piston block 10 to move within the oil inlet pipe 2, blocking the connection between the oil inlet 3 and the oil inlet pipe 2, thus achieving throttling. Furthermore, since the lead screw 16 is located in the first cavity 12 of the adjusting box 4, and the stepper motor 15 is located in the third cavity 14 of the adjusting box 4, both the lead screw 16 and the stepper motor 15 are protected by the adjusting box 4, avoiding exposure to the high-temperature, high-pressure, and easily contaminated working environment of the diesel engine injector. This helps extend the service life of the lead screw 16 and the stepper motor 15. Moreover, using the stepper motor 15 for driving adjustment changes the adjustment from manual to electric, greatly improving the adjustment accuracy. After the throttling adjustment is completed, the electric push rod 7 is activated to drive the locking rod 8 to descend, so that it passes through the first through hole 9 and is inserted into the locking hole 20 on the surface of the locking wheel 19, thereby limiting and locking the lead screw 16 so that it can no longer rotate, thus ensuring that the piston block 10 will not be displaced and affect the throttling adjustment. When it is necessary to restart the stepper motor 15 for adjustment, the electric push rod 7 is controlled to raise the locking rod 8.

[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A throttling diesel engine injector, comprising an injector body (1) and an inlet pipe (2) connected to the injector body (1), wherein an inlet port (3) is connected to the pipe body of the inlet pipe (2), characterized in that: An adjustment box (4) is fixed on the body of the oil inlet pipe (2), and the adjustment box (4) is located on the side of the oil inlet (3) away from the injector body (1). A first cavity (12) is opened in the middle of the adjustment box (4). A second cavity (13) and a third cavity (14) are respectively opened in the body of the adjustment box (4) on the left and right sides of the first cavity (12). A piston block (10) is movably installed in the body of the oil inlet pipe (2). A sealing ring (11) is sleeved on the circumferential side wall of the piston block (10). A throttling mechanism is provided in the body of the adjustment box (4) to drive the piston block (10) to move.

2. The throttling diesel engine injector according to claim 1, characterized in that: The throttling mechanism includes a stepper motor (15), a lead screw (16), and a moving block (17). The left and right ends of the lead screw (16) pass through the two side walls of the first cavity (12) via bearings. The stepper motor (15) is installed in the cavity of the third cavity (14), and the output end of the stepper motor (15) is connected to the right end of the lead screw (16) via a coupling. The moving block (17) is located in the cavity of the first cavity (12), and the moving block (17) is screwed onto the surface of the lead screw (16).

3. The throttling diesel engine injector according to claim 2, characterized in that: The throttling mechanism also includes an adjusting rod (5) and a second through hole (18). The second through hole (18) is respectively opened on the left and right side walls of the second cavity (13). One end of the adjusting rod (5) is fixedly installed on the left side wall of the moving block (17). The other end of the adjusting rod (5) movably passes through the cavity of the second through hole (18) and the pipe of the oil inlet pipe (2) and is fixedly connected to the left side wall of the piston block (10).

4. The throttling diesel engine injector according to claim 3, characterized in that: The throttling mechanism also includes a locking wheel (19) and a locking hole (20). The locking wheel (19) is located in the cavity of the second cavity (13). The right side wall of the locking wheel (19) is fixedly connected to the left end of the lead screw (16). The locking hole (20) is evenly opened on the circumferential side wall of the locking wheel (19).

5. The throttling diesel engine injector according to claim 4, characterized in that: The throttling mechanism also includes a fixed plate (6) and an electric push rod (7). The fixed plate (6) is fixedly installed on the top left wall of the regulating box (4), and the electric push rod (7) is fixedly installed on the top inner wall of the fixed plate (6).

6. The throttling diesel engine injector according to claim 5, characterized in that: The throttling mechanism also includes a locking rod (8) and a first through hole (9). The locking rod (8) is fixedly connected to the piston end of the electric push rod (7). The first through hole (9) is opened on the top wall of the regulating box (4) and communicates with the cavity of the second cavity (13). The locking rod (8) is located directly above the first through hole (9) and the locking wheel (19). The locking rod (8) is adapted to the cavity of the locking hole (20).

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