A self-pumping oil injector

Abstract

This invention provides a self-pumping fuel injector, comprising: an injector body with a sliding hole on it, the lower end of which is connected to the oil inlet end of a needle valve assembly via a connecting hole; a sealing hole communicating with the connecting hole in the injector body; an oil inlet chamber with an inner diameter larger than the inner diameter of the sealing hole at the end of the sealing hole away from the connecting hole; an oil inlet hole communicating with the oil inlet chamber in the injector body; a piston with a diameter matching the inner diameter of the sliding hole, the piston being installed inside the sliding hole; a push block fixedly mounted at the end of the piston away from the injector body; and a control valve with a sealing post fixedly mounted on its output shaft, the diameter of which matching the diameter of the sealing hole. The beneficial effects of this invention are: by controlling the opening time of the control valve, the fuel injection quantity can be precisely controlled, avoiding incomplete combustion; the fuel injection advance angle at different speeds can be continuously adjusted to control the fuel injection quantity, effectively controlling fuel consumption.

Description

Technical Field

[0001] This invention belongs to the field of fuel injector technology, and in particular relates to a self-pumping fuel injector. Background Technology

[0002] Fuel injectors are the core of the fuel system and even the engine system. The performance of fuel injectors directly affects the performance and even the safety of the engine. Based on the existing electronically controlled unit pump technology, this is a cost-effective upgrade and modification approach to achieve ultra-high pressure fuel injection in heavy-duty engines.

[0003] Traditional fuel injectors regulate fuel quantity using a mechanical centrifugal adjuster, which has the following problems in use: First, poor fuel quantity control accuracy leads to incomplete combustion of fuel, producing a large amount of carbonized particles and combustion smoke, which is detrimental to environmental protection; Second, the mechanical centrifugal adjuster has poor speed regulation accuracy, with a high adjustment rate and high noise; Third, the fuel injection advance angle cannot be continuously adjusted at different speeds, resulting in high fuel consumption. Summary of the Invention

[0004] In view of this, the present invention aims to provide a self-pumping oil injector in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] The first aspect of the present invention provides a self-pumping oil injector, comprising:

[0007] The injector body has a sliding hole, the lower end of which is connected to the oil inlet end of the needle valve assembly through a connecting hole. The injector body has a sealing hole that is connected to the connecting hole. The end of the sealing hole away from the connecting hole has an oil inlet chamber with an inner diameter larger than the inner diameter of the sealing hole. The injector body has an oil inlet hole that is connected to the oil inlet chamber.

[0008] A piston, the diameter of which matches the inner diameter of the sliding hole, is installed inside the sliding hole, and a push block is fixed at the end of the piston away from the injector body;

[0009] A control valve, wherein a sealing post is fixed on the output shaft of the control valve, and the diameter of the sealing post matches the diameter of the sealing hole.

[0010] Furthermore, when the output shaft of the control valve is in the extended state, the sealing column is located inside the sealing hole, and the sealing column closes the sealing hole;

[0011] When the output shaft of the control valve is in the retracted state, the sealing column is located inside the oil inlet chamber, and the oil inlet chamber is connected to the connection hole through the sealing hole;

[0012] A sealing groove is formed on the outer wall of the sealing column, and a sealing ring is provided in the sealing groove.

[0013] Furthermore, a second sealing groove is formed on the outer wall of the piston, and a second sealing ring is provided in the second sealing groove.

[0014] Furthermore, an elastic element is provided between the push block and the injector body;

[0015] The elastic element is a spring, which is mounted on the outside of the piston.

[0016] Furthermore, a roller is provided at the end of the push block away from the piston, and the roller is rotatably connected to the push block.

[0017] Furthermore, a guide groove is provided on the outer wall of the push block, and the guide groove is arranged in the opposite direction to the movement of the push block.

[0018] Furthermore, a ball is provided at the end of the push block away from the piston, and the ball is rotatably connected to the push block.

[0019] Furthermore, the lower end of the push block has a mounting groove corresponding to the spring, and the upper end of the spring is mounted inside the mounting groove.

[0020] The second aspect of the present invention provides a method of using the self-pumping oil injector described in the first aspect, wherein a needle valve assembly is installed in the injection port of an engine, the push block is positioned corresponding to the drive cam, and the drive cam drives the piston to move up and down.

[0021] When the piston moves toward the needle valve assembly, the sealing post is located inside the sealing hole. After being compressed by the piston, the fuel pressure in the sliding hole increases and enters the oil inlet end of the needle valve assembly.

[0022] When the piston moves away from the needle valve assembly, the sealing column is located inside the oil inlet chamber, and fuel enters the inner side of the sliding hole through the oil inlet hole, oil inlet chamber, sealing hole, and connecting hole.

[0023] Furthermore, a guide post corresponding to the guide groove is fixed on the engine housing, and the guide post is located inside the wire groove.

[0024] Compared with the prior art, the self-pumping oil injector of the present invention has the following beneficial effects:

[0025] (1) The self-pumping oil injector of the present invention can control the oil intake with high precision by controlling the opening time of the control valve, so as to avoid incomplete combustion. The oil intake can be continuously adjusted by the oil supply advance angle at different speeds, which can effectively control oil consumption. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 This is a three-dimensional structural diagram of the injector according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the injector according to an embodiment of the present invention;

[0029] Figure 3 As described in the embodiments of the present invention Figure 2 Schematic diagram of the structure at point A in the middle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Push block; 2. Roller; 3. Spring; 4. Piston; 5. Control valve; 6. Injector body; 8. Needle valve assembly; 501. Sealing column; 601. Sliding hole; 602. Connecting hole; 603. Oil inlet chamber; 604. Oil inlet hole. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 3 As shown, a self-pumping oil injector includes:

[0037] The injector body 6 has a sliding hole 601. The lower end of the sliding hole 601 is connected to the oil inlet end of the needle valve assembly 8 through a connecting hole 602. The injector body 6 has a sealing hole that is connected to the connecting hole 602. The end of the sealing hole away from the connecting hole 602 is provided with an oil inlet chamber 603. The inner diameter of the oil inlet chamber 603 is larger than the inner diameter of the sealing hole. The injector body 6 has an oil inlet hole 604 that is connected to the oil inlet chamber 603.

[0038] Piston 4, the diameter of piston 4 matches the inner diameter of slide hole 601, piston 4 is installed inside slide hole 601, and push block 1 is fixed at the end of piston 4 away from injector body 6.

[0039] Control valve 5, a sealing post 501 is fixed on the output shaft of control valve 5, and the diameter of sealing post 501 matches the diameter of sealing hole.

[0040] The control valve 5 can be a solenoid valve, or a linear motion component with an output shaft, such as a cylinder or an electric cylinder.

[0041] The needle valve assembly 8 adopts, but is not limited to, the existing Zibo Zichai 6210 marine diesel engine main engine light oil needle valve assembly 8DO150T935.

[0042] When the output shaft of the control valve 5 is in the extended state, the sealing column 501 is located inside the sealing hole, and the sealing column 501 closes the sealing hole.

[0043] When the output shaft of the control valve 5 is in the retracted state, the sealing column 501 is located inside the oil inlet chamber 603, and the oil inlet chamber 603 is connected to the connecting hole 602 through the sealing hole;

[0044] A sealing groove is formed on the outer wall of the sealing column 501, and a sealing ring is installed inside the sealing groove. The sealing ring increases the sealing performance between the sealing column 501 and the sealing hole.

[0045] A second sealing groove is formed on the outer wall of piston 4, and a second sealing ring is installed inside the second sealing groove. The first sealing ring increases the sealing performance between piston 4 and sliding hole 601.

[0046] An elastic element is provided between the push block 1 and the injector body 6;

[0047] The elastic element is spring 3, which is installed on the outside of piston 4.

[0048] In some embodiments, a roller 2 is provided at the end of the push block 1 away from the piston 4, and the roller 2 is rotatably connected to the push block 1. The roller 2 prevents the drive cam from scratching the push block 1.

[0049] A guide groove is provided on the outer wall of the push block 1, and the guide groove is set in the opposite direction to the movement of the push block 1.

[0050] In other embodiments, a ball bearing is provided at the end of the push block 1 away from the piston 4, and the ball bearing is rotatably connected to the push block 1. The ball bearing prevents the drive cam from scratching the push block 1.

[0051] The lower end of the push block 1 has a mounting groove corresponding to the spring 3. The upper end of the spring 3 is installed inside the mounting groove. The mounting groove reduces the size of the injector and facilitates installation.

[0052] Work process:

[0053] A method of using a self-pumping oil injector involves installing a needle valve assembly 8 into the fuel injection port of an engine, with the push block 1 corresponding to the position of the drive cam, and the drive cam driving the piston 4 to move up and down.

[0054] When piston 4 moves toward needle valve assembly 8, sealing post 501 is located inside sealing hole. After being compressed by piston 4, fuel pressure in sliding hole 601 increases and enters the oil inlet end of needle valve assembly 8.

[0055] When the piston 4 moves away from the needle valve assembly 8, the sealing column 501 is located inside the oil inlet chamber 603, and the fuel enters the inside of the sliding hole 601 through the oil inlet hole 604, the oil inlet chamber 603, the sealing hole, and the connecting hole 602.

[0056] A guide post corresponding to the guide groove is fixed on the engine housing, and the guide post is located inside the wire guide groove. The guide post guides and limits the movement of the push block 1 along the axis of the piston 4.

[0057] Driven by the engine camshaft or installed in an independent cam box, the electronically controlled unit pump enhances its ability to stably boost pressurized fuel to ultra-high pressure. The number of injectors with this self-pumping function can be determined according to the different rated power of the engine, further achieving low engine mechanical noise. By using the engine cam to achieve fuel supply pressure, it provides a cost-effective solution for upgrading existing electronically controlled unit pump engines.

[0058] By controlling the opening time of control valve 5, the oil intake can be precisely controlled to avoid incomplete combustion. The oil intake can be continuously adjusted by the oil supply advance angle at different speeds, which can effectively control oil consumption.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-pumping oil injector, characterized in that, include: The injector body (6) has a sliding hole (601) on it. The lower end of the sliding hole (601) is connected to the oil inlet end of the needle valve assembly (8) through a connecting hole (602). The injector body (6) has a sealing hole connected to the connecting hole (602). The end of the sealing hole away from the connecting hole (602) is provided with an oil inlet chamber (603). The inner diameter of the oil inlet chamber (603) is larger than the inner diameter of the sealing hole. The injector body (6) has an oil inlet hole (604) connected to the oil inlet chamber (603). Piston (4), the diameter of the piston (4) matches the inner diameter of the sliding hole (601), the piston (4) is installed inside the sliding hole (601), and a push block (1) is fixed at one end of the piston (4) away from the injector body (6); A control valve (5) is provided with a sealing post (501) fixed on its output shaft, the diameter of which matches the diameter of the sealing hole; When the output shaft of the control valve (5) is in the extended state, the sealing post (501) is located inside the sealing hole, and the sealing post (501) closes the sealing hole. When the output shaft of the control valve (5) is in the retracted state, the sealing column (501) is located inside the oil inlet chamber (603), and the oil inlet chamber (603) is connected to the connecting hole (602) through the sealing hole; An elastic element is provided between the push block (1) and the injector body (6); A guide groove is provided on the outer side wall of the push block (1), and the guide groove is arranged along the moving direction of the push block (1); When the piston (4) moves toward the needle valve assembly (8), the sealing column (501) is located inside the sealing hole. When the piston (4) moves away from the needle valve assembly (8), the sealing column (501) is located inside the oil inlet chamber (603).

2. The self-pumping oil injector according to claim 1, characterized in that: A sealing groove is provided on the outer wall of the sealing column (501), and a sealing ring is provided in the sealing groove.

3. A self-pumping oil injector according to claim 1, characterized in that: A sealing groove 2 is provided on the outer side wall of the piston (4), and a sealing ring 2 is provided in the sealing groove 2.

4. A self-pumping oil injector according to claim 1, characterized in that: The push block (1) is provided with a roller (2) at one end away from the piston (4), and the roller (2) is rotatably connected to the push block (1).

5. A self-pumping oil injector according to claim 1, characterized in that: The push block (1) is provided with a ball at one end away from the piston (4), and the ball is rotatably connected to the push block (1).

6. A self-pumping oil injector according to claim 1, characterized in that: The elastic element is a spring (3), which is installed on the outside of the piston (4).

7. A self-pumping oil injector according to claim 6, characterized in that: The lower end of the push block (1) has a mounting groove corresponding to the spring (3), and the upper end of the spring (3) is installed inside the mounting groove.

8. A method of using a self-pumping oil injector according to any one of claims 1-7, characterized in that: The needle valve assembly (8) is installed in the oil injection hole of the engine, and the push block (1) is positioned corresponding to the drive cam. The drive cam drives the piston (4) to move up and down. When the piston (4) moves toward the needle valve assembly (8), the sealing column (501) is located inside the sealing hole. After being compressed by the piston (4), the fuel pressure in the sliding hole (601) increases and enters the oil inlet end of the needle valve assembly (8). When the piston (4) moves away from the needle valve assembly (8), the sealing column (501) is located inside the oil inlet chamber (603), and fuel enters the inside of the sliding hole (601) through the oil inlet hole (604), the oil inlet chamber (603), the sealing hole, and the connecting hole (602).

9. The method of using a self-pumping oil injector according to claim 8, characterized in that: A guide post corresponding to the guide groove is fixed on the engine housing, and the guide post is located inside the wire groove.

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