CN118224022A - Oil inlet joint of common rail oil sprayer - Google Patents
Oil inlet joint of common rail oil sprayer Download PDFInfo
- Publication number
- CN118224022A CN118224022A CN202410403595.9A CN202410403595A CN118224022A CN 118224022 A CN118224022 A CN 118224022A CN 202410403595 A CN202410403595 A CN 202410403595A CN 118224022 A CN118224022 A CN 118224022A
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- CN
- China
- Prior art keywords
- filter
- common rail
- oil
- cartridge
- filter cartridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001914 filtration Methods 0.000 claims abstract description 41
- 239000000446 fuel Substances 0.000 claims description 35
- 239000011148 porous material Substances 0.000 claims description 7
- 239000002283 diesel fuel Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 45
- 239000012535 impurity Substances 0.000 description 16
- 238000012423 maintenance Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an oil inlet joint of a common rail oil sprayer, which comprises a body and a filter cartridge sleeved in the body, wherein the open end of the filter cartridge is fixedly connected with the body and used for filtering oil inlet of the body, a plurality of uniformly distributed filter holes are formed in the side wall of the middle part of the filter cartridge, and each filter hole is in a flaring structure from inside to outside. The net-shaped filter cylinder of the oil inlet joint of the diesel oil injector has good filtering effect and can effectively prevent tiny particles and pollutants from entering the diesel oil injector.
Description
Technical Field
The invention relates to the technical field of fuel injectors, in particular to an oil inlet joint of a common rail fuel injector.
Background
With the rapid increase of urban transportation vehicles and ships around the world, the tail gas discharged by a diesel engine has become a main pollution source to the global environment. The world has also begun to seek and take effective technical measures to actively reduce and control the emission of pollutants. The common rail type electrically controlled fuel injection technology for diesel engine is one new technology for controlling pollutant discharge. After 2015, china has implemented national four-emission regulations of road vehicles, non-road vehicles implement national three-regulation of non-road vehicles, a simple mechanical fuel injector can not meet national emission requirements, and the selection of an electric control high-pressure common rail technology has become a necessary trend of the diesel engine industry.
Fuel injectors are extremely important components that affect various performance metrics and operational reliability of an engine. The development of the fuel injector in China mainly surrounds the design and manufacture of the mechanical fuel injector. The fuel injector mainly comprises an electromagnetic valve, a metering valve, a needle valve, a fuel nozzle and the like; the working principle of the fuel injector is that the electromagnetic valve is used for controlling the opening and closing of the metering valve, so that the needle valve can be lifted or fallen under the action of the spring and the oil pressure, and the high-speed fuel injection of the high-pressure fuel entering the fuel injector from the fuel nozzle or the high-speed fuel injection of the high-pressure fuel not entering the fuel injector is realized.
The diesel oil in the oil sprayer contains some impurities in the transportation process, if the diesel oil is directly used in a fuel system without purification treatment such as precipitation and filtration, even if the small impurities enter a plunger pair, an oil outlet valve and the oil sprayer, the surface of a precise part can be ground like abrasive materials at high pressure and high speed, the smoothness and the fit clearance of the precise part are damaged, and the work of an engine can be seriously influenced for a long time.
Therefore, in the prior art, a filter screen is arranged at the oil inlet position of the oil injector and is used for intercepting impurities in diesel oil. For example, in the patent application number CN201910921349.1 and the patent named as a common rail injector, a filter screen is arranged at the position of the inlet nozzle of the injector, and the filter screen is used for intercepting small particles and other foreign matters in high-pressure oil, so that the risks of unsatisfactory oil injection effect, oil leakage and the like caused by the foreign matters entering the injector can be avoided.
However, this patent does not describe the shape of the filter holes on the filter screen, the installation positions of the filter holes on the filter screen, and the like, but the hole diameters of the filter holes, which are easily thought by those skilled in the art, are determined based on the diameters of the foreign matters to be filtered, and the filter holes have a straight hole structure, so that the foreign matters in the high-pressure oil can be filtered. Because the oil feed speed of high-pressure oil is great, and the internal pressure of sprayer is generally more than 200Mpa, if the filtration pore position and the filtration pore structure of filter screen are unreasonable, at the high-pressure oil in-process of flowing through the filter screen, impurity can gather fast for the filter screen will block up in the shorter time, influences the sprayer normal use, simultaneously, for needing more frequent change or washing filter screen, increase maintenance work. Accordingly, there is a need to provide a fuel injector nozzle screen that can achieve effective filtration over a long period of time.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the oil inlet joint of the common rail oil sprayer, which adopts a unique net structure design, improves the filtering precision and effectively prevents tiny particles and pollutants from entering the oil sprayer.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides an oil feed joint of common rail sprayer, includes that body and cover establish the cartridge filter in this, cartridge filter open end and body fixed connection are used for filtering the body oil feed, a plurality of filtration holes that the equipartition set up have been seted up on the lateral wall at cartridge filter middle part, and every filtration hole is by inside outside flaring structure.
The principle of the invention is as follows: high-pressure oil flows through the filter cartridge from the oil inlet joint and then enters the oil sprayer. Because the fuel injector is in a vertical state in the use process, high-pressure oil firstly impacts the bottom of the filter cartridge, and the high-pressure oil enters the fuel injector through the filter hole due to the fluid operation action and the influence of subsequent high-pressure oil; at the moment, impurities in the high-pressure oil are intercepted at the inner side of the filtering hole, and the intercepted impurities are driven to move in the filtering barrel due to the fact that the high-pressure oil continuously enters the filtering barrel, so that the blocking of the filtering hole is avoided, and the filtering precision is improved; the filter holes are in flaring structures (conical shapes) and can change the flow velocity at two ends of the filter holes, so that the pressure reduction effect is achieved, high-pressure oil which newly enters the filter cartridge is convenient to filter through the filter holes rapidly, the phenomenon that the pressure is increased due to accumulation of fuel oil in the filter cartridge is avoided, impurities are easy to collect or accumulate at the positions of the filter holes while flow blocking is carried out, the service time of the filter cartridge can be effectively ensured, and the maintenance times are reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. The filter cartridge can be made of high-strength and corrosion-resistant materials so as to ensure a long-term stable filtering effect;
2. The filter cartridge has the characteristic of easy replacement, and is convenient for a user to maintain and clean;
3. The filter cartridge has compact structure, does not occupy excessive space, and is suitable for various diesel fuel injector models;
5. The unique net structure design improves the filtration precision, effectively prevents tiny particles and pollutants from entering the fuel injector.
The net-shaped filter cylinder of the oil inlet joint of the diesel oil injector has good filtering effect and can effectively prevent tiny particles and pollutants from entering the diesel oil injector.
Further, the small end pore diameter of the filter pore is 0.04-0.08mm.
Further, the center distance of any two adjacent filter holes is 0.2-0.4mm.
Further, the cartridge filter is cylindric, and the cartridge filter includes flaring section, first straight section, throat section and the straight section of second in proper order from its opening towards its other end along its length direction, and a plurality of filtration pore settings are in the straight section middle part of second and are close to the throat section setting.
Further, the plurality of filter holes are distributed in rows along the length direction of the second straight section, and the plurality of filter holes in each row are arranged in a ring along the second straight Duan Zhouxiang.
Further, the thickness of the side wall of the filter cartridge is 0.2-0.6mm.
Drawings
FIG. 1 is a schematic view of the oil inlet joint of the present invention;
FIG. 2 is a schematic view of a filter cartridge according to the present invention;
FIG. 3 is a schematic view showing the distribution structure of a plurality of filter holes in each row of the present invention.
In the figure: the filter cartridge comprises a body 1, a filter cartridge 2, a flaring section 21, a first straight section 22, a necking section 23, a second straight section 24 and a filter hole 25.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1 and 2, an oil inlet joint of a common rail oil injector comprises a body 1 and a filter cartridge 2 sleeved in the body 1, wherein the opening end of the filter cartridge 2 is fixedly connected with the body to filter oil inlet of the body, a plurality of uniformly distributed filter holes 25 are formed in the side wall of the middle part of the filter cartridge 2, and each filter hole 25 is in a flaring structure from inside to outside.
In the invention, the filter hole 25 is arranged in the middle of the filter cylinder 2, so that the processing difficulty can be reduced, a section of unpunched area can be left, the fuel filtering can play a role in buffering, the filter hole 25 is not washed out to severely reduce the service life due to the high fuel pressure and flow velocity, and meanwhile, the filtered impurities can be collected at the position for temporary storage treatment, so that the rapid filtering effect can be realized. The structure of the filtering hole 25 adopts a structure with outward flaring, and compared with a through hole structure with conventional arrangement, the filtering hole 25 provided by the invention can effectively filter tiny particles and can not excessively block the flow of fuel. Because the filtering holes 25 with the structure can lead the outer pressure of the filtering holes 25 to be smaller than the inner pressure, the fuel oil flowing through can be ensured to flow quickly, and the phenomenon that the pressure is increased due to accumulation of the fuel oil in the filtering cylinder 2 and the filtering effect and the feeding flow rate are influenced is avoided. As shown in fig. 3, the filter hole 25 is in a truncated cone structure, and the taper angle of the truncated cone structure is not too large, otherwise, the pressure of fuel entering the fuel injector is obviously reduced and does not meet the working requirement, and therefore, the flaring angle a of the filter hole 25 is 1-5 degrees in the invention.
The high-pressure oil flows through the filter cartridge 2 from the body 1 and then enters the fuel injector. Because the fuel injector is in a vertical state in the use process, high-pressure oil firstly impacts the bottom of the filter cartridge 2, and the high-pressure oil enters the fuel injector through the filter holes 25 due to the fluid operation action and the influence of subsequent high-pressure oil; at this time, impurities in the high-pressure oil are intercepted at the inner side of the filtering holes 25, and the intercepted impurities are driven to move in the filtering barrel 2 due to the fact that the high-pressure oil continuously enters the inside of the filtering barrel 2, so that the blocking of the filtering holes 25 is avoided, and the filtering precision is improved; the flow velocity at two ends of the filtering hole 25 can be changed by the aid of the flaring structure (the cone shape) of the filtering hole 25, so that a depressurization effect is achieved, high-pressure oil which newly enters the filtering cylinder 2 is convenient to filter through the filtering hole 25 rapidly, pressure increase caused by accumulation of the oil in the filtering cylinder 2 is avoided, impurities are easy to collect or accumulate at the position of the filtering hole 25 while flow blocking is carried out, service time of the filtering cylinder 2 can be effectively ensured, and maintenance times are reduced.
In another embodiment of the invention, since the main impurities of diesel oil in the fuel engine include soil particles, sand, rock powder, fine dust, etc., the main components of these impurities are sulfon and bauxite. The impurities of diesel fuel originate mainly from sediments during transportation and storage. Based on the source of main impurities in the diesel, the small end hole diameter R of the filtering holes 25 is 0.04-0.08mm, so that larger impurity particles contained in the diesel can be effectively filtered.
In another embodiment of the present invention, the center distance of any adjacent two filter holes 25 is 0.2-0.4mm. Theoretically, the smaller the center distance between the adjacent two filter holes 25, the smaller the filter resistance. However, too small a range may result in insufficient structural rigidity of the filter holes 25, the filter cartridge 2 may be damaged easily during operation, and too large a range may result in an enlarged design of the filter cartridge 2, resulting in waste of space and materials. For this reason, in the present invention, the center distance between any two adjacent filter holes 25 is 0.2 to 0.4mm in consideration of machining tolerance in combination with the wall thickness of the adjacent filter holes 25 not being smaller than the aperture.
In another embodiment of the present invention, as shown in fig. 2, the filter cartridge 2 is cylindrical, and the filter cartridge 2 includes, in order from its opening toward its other end along its length direction, a flared section 21, a first straight section 22, a reduced mouth section 23, and a second straight section 24, and a plurality of filter holes 25 are disposed in the middle of the second straight section 24 and near the reduced mouth section 23. The flaring section 21, the first straight section 22 and the necking section 23 can be matched to form a clamping structure, as shown in fig. 1, the whole filter cartridge 2 is directly clamped at the feeding position of the body 1, the mode avoids the press forming of the center in the prior art, the filter cartridge 2 is pressed into the body 1 by adopting larger force (4.5+/-2.5 kN), the pressing direction is consistent with the fuel flow direction, secondary fixation is not needed, and the filter cartridge 2 is not separated from the body 1 under the impact action of high-pressure oil. In order to enable the filter cartridge 2 to smoothly filter high-pressure oil, the distance L between the upper end of the filter cartridge 2 and the upper end of the body 1 is 4+/-0.2 mm. The structure ensures that the filter cartridge 2 is more convenient to install and replace, reduces the maintenance difficulty and improves the maintenance efficiency. Meanwhile, in order to facilitate the filter cartridge 2 to be smoothly installed in the body 1, the filter cartridge 2 with the sidewall thickness r of 0.2-0.6mm is adopted in the invention. The filter cartridge 2 has certain elasticity due to the adoption of the thin-shell structure, is easier to press into the connector, and is easier to take out, replace and maintain.
In another embodiment of the present invention, in order to facilitate the opening and layout of the plurality of filter holes 25, in this embodiment, as shown in fig. 3, the plurality of filter holes 25 are distributed in rows along the length direction of the second straight section 24, and the plurality of filter holes 25 in each row are circumferentially arranged in a ring along the second straight section 24. Meanwhile, in order to consider the processing requirement and the rigidity requirement of the filter cartridge 2, the lengths l of the multiple rows of filter holes 25 are about 2/3 of the total length of the second straight sections 24, so that the filter cartridge can be conveniently processed and simultaneously has enough rigidity.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides an oil feed joint of common rail sprayer, includes body (1) and cover establish cartridge filter (2) in body (1), cartridge filter (2) open end and body fixed connection and be used for filtering body (1) oil feed, its characterized in that: a plurality of uniformly distributed filter holes (25) are formed in the side wall of the middle of the filter cylinder (2), and each filter hole (25) is in a flaring structure from inside to outside.
2. The fuel inlet joint of a common rail injector of claim 1, wherein: the small end pore diameter of the filter pore (25) is 0.04-0.08mm.
3. The fuel inlet joint of a common rail injector of claim 2, wherein: the center distance between any two adjacent filter holes (25) is 0.2-0.4mm.
4. An oil feed joint for a common rail injector according to any one of claims 1-3, wherein: the filter cartridge (2) is cylindrical, the filter cartridge (2) sequentially comprises a flaring section (21), a first straight section (22), a necking section (23) and a second straight section (24) from the opening end to the other end, and a plurality of filter holes (25) are formed in the middle of the second straight section (24) and close to the necking section (23).
5. The fuel inlet joint of a common rail injector of claim 4, wherein: the plurality of filter holes (25) are distributed in rows along the length direction of the second straight section (24), and the plurality of filter holes (25) in each row are arranged in a ring along the circumference of the second straight section (24).
6. An oil feed joint (1) of a common rail injector according to claim 1,2, 3 or 5, characterized in that: the thickness of the side wall of the filter cartridge (2) is 0.2-0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410403595.9A CN118224022A (en) | 2024-04-03 | 2024-04-03 | Oil inlet joint of common rail oil sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410403595.9A CN118224022A (en) | 2024-04-03 | 2024-04-03 | Oil inlet joint of common rail oil sprayer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118224022A true CN118224022A (en) | 2024-06-21 |
Family
ID=91504425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410403595.9A Pending CN118224022A (en) | 2024-04-03 | 2024-04-03 | Oil inlet joint of common rail oil sprayer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118224022A (en) |
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2024
- 2024-04-03 CN CN202410403595.9A patent/CN118224022A/en active Pending
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|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |