A fuel injector filter assembly

Abstract

The application discloses an oil injector filtering assembly and belongs to the technical field of oil injector accessories. Mainly including an oil pipe, the oil pipe is communicated with an oil tank, the oil pipe is communicated with a filtering mechanism, the filtering mechanism comprises a shell, a filter cartridge is arranged in the shell, an oil cavity is formed between the filter cartridge and the shell, filter holes are arranged on the filter cartridge, an extension column is arranged on the upper end of the shell, a buffer cavity is arranged in the extension column, a first internal thread is arranged on the upper end of the buffer cavity, a plug column is inserted into the buffer cavity, a first external thread is arranged in the middle of the plug column, a sealing table is arranged at the bottom of the plug column, a groove is formed between the sealing table and the first external thread and on the upper end of the first external thread, and an exhaust pipe is communicated with the positions of the two grooves. The oil injector filtering assembly can discharge the excess gas in the oil pipe through the exhaust assembly when the oil injector is used for the first time or the filter element is replaced, so that the oil supply of the oil injector is kept stable.

Description

Technical Field

[0001] This application relates to the field of injector accessory technology, specifically an injector filter assembly. Background Technology

[0002] The fuel injector is a key actuator in the internal combustion engine's fuel injection system. It is responsible for accurately injecting fuel in an atomized state into the cylinder or intake manifold, where it mixes with air to form a combustible mixture, directly affecting the engine's power, economy, emissions performance, and reliability.

[0003] Fuel injectors are classified according to the fuel system into multi-point electronic injection, single-point electronic injection, direct injection, and diesel engine injectors. Diesel engine injectors are often used in conjunction with high-pressure common rail systems and employ piezoelectric crystals or electromagnetic drives to achieve multiple injections (pre-injection, main injection, and post-injection), optimize the combustion process, and reduce noise and emissions (such as NOx and PM).

[0004] The high-pressure common rail system consists of five core modules: a high-pressure fuel pump, a common rail, fuel injectors, an electronic control unit (ECU), and a sensor array. The system pressurizes the fuel through the high-pressure fuel pump and distributes it to the fuel injectors of each cylinder through the common rail. It also precisely controls the timing, pressure, and number of injections to achieve multiple pre-injections and main injections, thereby reducing noise (reducing the "knocking" sound of the diesel engine), improving combustion efficiency (thermal efficiency can reach 45%), and meeting emission standards.

[0005] However, if the gas is not bleeded during the first use of the high-pressure common rail system or when the filter element is replaced, the gas may affect the stability of the fuel supply. Therefore, it is necessary to provide an injector filter assembly to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the prior art, the problem to be solved by this application is to provide an injector filter assembly that solves the problem of fuel supply stability caused by the lack of venting when the injector is used for the first time or when the filter element is replaced.

[0008] The technical solution adopted by this application to solve its technical problem is: an injector filter assembly, including an oil pipe connected to a fuel tank for supplying fuel to the injector, and a filter mechanism connected to the oil pipe, the filter mechanism including:

[0009] The outer casing has a filter cylinder inside, forming an oil cavity between the filter cylinder and the outer casing, and the filter cylinder has filter holes communicating with the oil cavity.

[0010] An extension post is provided at the upper end of the outer shell, and a buffer cavity that penetrates the oil cavity is provided inside the extension post. A first internal thread is provided at the upper end of the buffer cavity.

[0011] A plug is inserted into the buffer cavity, a first external thread is provided at the middle position of the plug, and a sealing platform is provided at the bottom of the plug;

[0012] Grooves are formed between the sealing platform and the first external thread, as well as at the upper end of the first external thread, and exhaust pipes are connected at the locations of the two grooves.

[0013] Furthermore, a sealing ring is fitted around the outer ring of the sealing platform.

[0014] Furthermore, a protective cover is fitted over the upper end of the plunger.

[0015] Furthermore, the bottom of the protective cover is provided with a second internal thread, and the upper end of the plunger is provided with a second external thread, the second external thread and the second internal thread engaging to lock together.

[0016] Furthermore, the protective cover is made of rubber.

[0017] The beneficial effects of this application are: the injector filter assembly provided by this application, by providing an exhaust component on the filter assembly, can discharge excess gas in the oil pipe through the exhaust component when the injector is used for the first time or when the filter element is replaced, thereby making the fuel supply of the injector stable.

[0018] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is an overall schematic diagram of an injector filter assembly according to this application;

[0021] Figure 2 for Figure 1 Internal cross-sectional view of the filter assembly;

[0022] Figure 3 for Figure 2 A partial structural diagram at point A in the middle;

[0023] Figure 4 for Figure 3 Exploded structural diagram of the central exhaust assembly;

[0024] The following are the labeling elements in the figure:

[0025] 1. Oil pipe;

[0026] 2. Filtering mechanism; 21. Outer shell; 22. Oil inlet; 23. Oil outlet; 24. Filter holes; 25. Oil chamber; 26. Filter cylinder;

[0027] 3. Oil pump; 4. Common rail; 5. Injector;

[0028] 6. Exhaust assembly; 61. Extension post; 62. Buffer chamber; 63. Exhaust pipe; 64. First internal thread; 65. Plug; 66. Sealing platform; 67. Sealing ring; 69. First external thread; 610. Second external thread; 611. Protective cover; 612. Second internal thread. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] like Figures 1-2 As shown, this application provides an injector filter assembly, including an oil pipe 1, which is connected to an oil tank, and an oil pump 3 is connected to the oil pipe 1. The oil pump 3 is adapted to pump oil from the oil tank through the oil pipe 1.

[0032] Meanwhile, a common rail pipe 4 is connected to the output end of the oil pump 3, and multiple sets of injectors 5 are connected to the common rail pipe 4. The injectors 5 are used to spray oil as needed.

[0033] The above is a partial structural introduction of the high-pressure common rail system. For more detailed structural and control methods, please refer to existing technologies, which will not be elaborated here.

[0034] Continue to refer to Figures 1-2A filter mechanism 2 is provided on the oil pipe 1. The filter mechanism 2 is used to purify the oil. The filter mechanism 2 includes a housing 21. The housing 21 is provided with an oil inlet 22 and an oil outlet 23 that are connected to the oil pipe 1. The oil inlet 22 is used to introduce the oil, and the oil outlet 23 is used to export the purified oil.

[0035] A filter cylinder 26 is provided inside the outer casing 21, forming an oil cavity 25 between the filter cylinder 26 and the outer casing 21. A filter hole 24 communicating with the oil cavity 25 is provided on the filter cylinder 26, and the oil inlet 22 is connected to the lower end of the filter cylinder 26, while the oil outlet 23 is connected to the oil cavity 25.

[0036] The oil then enters the filter cylinder 26 through the oil inlet 22, is filtered through the filter hole 24, and the filtered oil is introduced into the oil chamber 25. The oil in the oil chamber 25 is then discharged into the oil pipe 1 through the oil outlet 23 for subsequent oil injection operations.

[0037] However, if the venting operation is not performed when the high-pressure common rail system is used for the first time or when the filter mechanism 2 is cleaned or replaced, the gas may affect the stability of the oil supply.

[0038] To solve the above problems, such as Figures 2-4 As shown, an exhaust assembly 6 is provided at the upper end of the housing 21. The exhaust assembly 6 includes an extension post 61 provided at the upper end of the housing 21. The extension post 61 has a buffer cavity 62 that passes through the oil cavity 25 inside. The upper end of the buffer cavity 62 is provided with a first internal thread 64.

[0039] Meanwhile, a plug 65 is inserted into the buffer cavity 62. The plug 65 has a first external thread 69 that matches the first internal thread 64 at the middle position. Thus, the plug 65 can be fixed inside the buffer cavity 62 by the cooperation of the first external thread 69 and the first internal thread 64.

[0040] Furthermore, a sealing platform 66 with a diameter larger than that of the plug 65 is provided at the bottom of the plug 65. The sealing platform 66 is sealed to the bottom of the buffer chamber 62. Thus, when the plug 65 is fixed inside the buffer chamber 62, the sealing platform 66 seals the bottom of the buffer chamber 62, thereby sealing the oil chamber 25 and thus not affecting the purification operation of the filter mechanism 2.

[0041] It should be noted that because the diameters of the sealing plate 66 and the first external thread 69 are relatively large, grooves are formed between the sealing plate 66 and the first external thread 69, as well as at the upper end of the first external thread 69. An exhaust pipe 63 is connected to the two grooves, and the exhaust pipe 63 passes through the inside of the plug 65.

[0042] Therefore, when it is necessary to vent the oil chamber 25, the plug 65 can be screwed down to disengage the first external thread 69 and the first internal thread 64. At this time, the sealing plate 66 enters the oil chamber 25 from the bottom of the buffer chamber 62.

[0043] When the sealing plate 66 is fully inserted into the oil cavity 25, the groove located between the sealing plate 66 and the first external thread 69 also enters the oil cavity 25 simultaneously. At this time, the gas and some oil in the oil cavity 25 can be discharged to the upper end through the exhaust pipe 63.

[0044] After the venting is complete, simply screw the plunger 65 back to its initial position.

[0045] Furthermore, a sealing ring 67 can be fitted around the outer ring of the sealing platform 66 to further enhance the sealing performance between the sealing platform 66 and the inner wall of the buffer cavity 62.

[0046] like Figures 3-4 As shown, a protective cover 611 is fitted on the upper end of the plunger 65. The protective cover 611 is used to protect the upper end of the exhaust pipe 63 when no exhaust is being discharged, and the protective cover 611 can be removed when exhaust is being discharged.

[0047] Meanwhile, a second internal thread 612 is provided at the bottom of the protective cover 611, and a second external thread 610 is provided at the upper end of the plug 65. The second external thread 610 and the second internal thread 612 are engaged and locked to fix the protective cover 611 to the upper end of the plug 65.

[0048] Furthermore, the protective cover 611 is made of rubber, so that it can be flipped up during exhaust (e.g., Figure 4 (Status) Open the protection for exhaust pipe 63.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fuel injector filter assembly, characterized in that: include: An oil pipe (1) is connected to a fuel tank and is used to supply fuel to the injector. A filter mechanism (2) is connected to the oil pipe (1). The filter mechanism (2) includes: The outer shell (21) has a filter cylinder (26) inside it, and an oil cavity (25) is formed between the filter cylinder (26) and the outer shell (21). The filter cylinder (26) has a filter hole (24) communicating with the oil cavity (25). The upper end of the outer shell (21) is provided with an extension post (61), and the interior of the extension post (61) is provided with a buffer cavity (62) that penetrates the oil cavity (25). The upper end of the buffer cavity (62) is provided with a first internal thread (64). A plug (65) is inserted into the buffer cavity (62), and a first external thread (69) is provided in the middle position of the plug (65). A sealing platform (66) is provided at the bottom of the plug (65). Grooves are formed between the sealing platform (66) and the first external thread (69), and at the upper end of the first external thread (69), and exhaust pipes (63) are connected at the two grooves.

2. The injector filter assembly according to claim 1, characterized in that: A sealing ring (67) is fitted around the outer ring of the sealing platform (66).

3. The injector filter assembly according to claim 1, characterized in that: The upper end of the plunger (65) is fitted with a protective cover (611).

4. The injector filter assembly according to claim 3, characterized in that: The bottom of the protective cover (611) is provided with a second internal thread (612), and the upper end of the plug (65) is provided with a second external thread (610). The second external thread (610) and the second internal thread (612) are engaged and locked together.

5. The injector filter assembly according to claim 4, characterized in that: The protective cover (611) is made of rubber.

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