CN115013208B

CN115013208B - Filter element structure of high-pressure common rail system

Info

Publication number: CN115013208B
Application number: CN202210750513.9A
Authority: CN
Inventors: 蒋伯明; 吴广领; 吴克忠; 龚蕾
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-07-04
Anticipated expiration: 2042-06-28
Also published as: CN115013208A

Abstract

The invention belongs to the technical field of automobile parts, and discloses a filter element structure of a high-pressure common rail system. The filter element structure of the high-pressure common rail system comprises an oil duct and a filter element arranged in the oil duct, wherein the filter element is provided with a filter cavity for filtering oil, the filter cavity comprises an annular cavity wall, the annular cavity wall is opposite to an inner pipe wall of the oil duct, a plurality of filter holes are formed in the annular cavity wall, and the diameter of each filter hole is gradually increased along the flow direction of the oil. The invention not only can effectively filter the elongated impurities, but also can increase the flow rate of oil permeated from the filter element, thereby increasing the passing rate of the oil under high pressure and ensuring that the passing rate and cleanliness of the high-pressure fuel flowing through the fuel injector meet the requirements.

Description

Filter element structure of high-pressure common rail system

Technical Field

The invention relates to the technical field of automobile parts, in particular to a filter element structure of a high-pressure common rail system.

Background

The high-pressure common rail system accumulates high-pressure fuel output by the oil pump by using a large-volume common rail cavity, eliminates pressure fluctuation in the fuel, and then transmits the fuel to each oil injector, and starts and ends injection by controlling an electromagnetic valve on the oil injector.

In the prior art, high-pressure fuel used in a high-pressure common rail system can flow into a fuel injector only through precise filtration, once the high-pressure fuel filtration fails, the fuel cleanliness is unstable in quality, and the problems of blockage, blockage and the like of the fuel injector are easily caused, so that a high-performance filter element is assembled in a high-pressure fuel pipe joint pipe through which high-pressure fuel flows upstream to filter the high-pressure fuel, the high-pressure fuel passing rate and the cleanliness of the high-pressure fuel flowing through the fuel injector are ensured to meet the requirements, and a gap filter element is generally adopted at present, namely the gap filter element is installed in the high-pressure fuel pipe joint pipe in an interference manner, and the filtration is realized through the diameter difference of the gap filter element and a high-pressure fuel pipe joint pipe assembly hole. On the one hand, the fuel oil passing rate is limited under high pressure, and the elongated impurities easily flow out of the filter gaps of the gap filter element, so that the cleanliness and the quality are reduced.

Therefore, there is a need to solve the above problems.

Disclosure of Invention

The invention aims to provide a filter element structure of a high-pressure common rail system, which aims to solve the problems that fuel oil passing rate is limited under high pressure, and elongated impurities easily flow out of a filter gap of a slit type filter element to cause the reduction of cleanliness and quality.

In order to achieve the purpose, the invention provides a filter element structure of a high-pressure common rail system, which comprises an oil duct and a filter element arranged in the oil duct, wherein the filter element is provided with a filter cavity for filtering oil, the filter cavity comprises an annular cavity wall, the annular cavity wall is arranged opposite to an inner pipe wall of the oil duct, a plurality of filter holes are formed in the annular cavity wall, and the diameters of the filter holes are gradually increased along the flow direction of the oil.

Preferably, the filter holes are tapered holes, the minimum hole distance h=d1+|k| (D1-D2)/H of the filter holes along the axial direction of the annular cavity wall, wherein D1 is the diameter of the filter holes on one side of the annular cavity wall opposite to the oil duct, K is the taper coefficient of the filter holes, D1 is the diameter of the oil duct, D2 is the outer diameter of the annular cavity wall, H is the depth of the filter holes, and k= (D2-D1)/H, D2 is the diameter of the filter holes on one side of the annular cavity wall opposite to the filter cavity.

Preferably, the plurality of filter holes are arranged at intervals along the radial direction of the annular cavity wall, a minimum included angle ANG between two adjacent filter holes is = [ d2+|k| (D1-D2) ] × 360/(D1 × pi), wherein D2 is the diameter of the filter hole on one side of the annular cavity wall opposite to the filter cavity, K is the taper coefficient of the filter hole, D1 is the diameter of the oil duct, and D2 is the outer diameter of the annular cavity wall.

Preferably, K has a value in the range of-0.08 to-0.1.

Preferably, the maximum allowable number n=int [ 360/(P1 x ANG) ] of all the filter holes, wherein Int [ ] is a function of the integer of data, P1 is the intensity coefficient of the filter element, and the value range of P1 is 1.5 to 2.

Preferably, the minimum allowable number of all the filter holes n=p2×d12/D22, where P2 is a failure coefficient, D1 is a diameter of the oil passage, D2 is a diameter of the filter hole on a side of the annular cavity wall opposite to the filter cavity, and P2 is 1.3.

Preferably, the filter element structure of the high-pressure common rail system further comprises a mounting hole for mounting the filter element, wherein the diameter d3=d1+0.05mm of the mounting hole, and D1 is the diameter of the oil duct.

Preferably, the filter element structure of the high-pressure common rail system further comprises a conical transition hole positioned between the oil duct and the mounting hole, and the taper of the conical transition hole is 60 degrees.

The invention has the beneficial effects that: the invention not only can effectively filter the elongated impurities, but also can increase the flow rate of oil permeated from the filter element, thereby increasing the passing rate of the oil under high pressure and ensuring that the passing rate and cleanliness of the high-pressure fuel flowing through the fuel injector meet the requirements.

Drawings

FIG. 1 is a schematic diagram of a structure of a filter element of a high-pressure common rail system according to an embodiment of the present invention;

FIG. 2 is a schematic view of the cartridge of FIG. 1;

FIG. 3 is a partial view at R in FIG. 1;

FIG. 4 is a schematic illustration of the structure of the filter element of the high pressure common rail system of FIG. 1 in a cross section of the filter cavity portion;

FIG. 5 is a schematic illustration of the cartridge structure of the high pressure common rail system of FIG. 1 in a mounting hole and transition hole portion;

fig. 6 is a partial view at S in fig. 5.

In the figure:

1. a high pressure connection tube; 11. an oil passage; 12. a tapered transition hole;

2. a filter element; 21. a filter chamber; 22. an annular cavity wall; 23. filtering holes; 24. an abutting portion; 25. and a mounting part.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" 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 will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In the prior art, a high-pressure common rail system is generally adopted for supplying diesel oil to a piston cylinder in a diesel engine, and high-pressure fuel used in the high-pressure common rail system can flow into a fuel injector through precise filtration, so that once the high-pressure fuel filtration fails, the fuel cleanliness is unstable in quality, the problems of blockage of the fuel injector, blockage of a fuel nozzle and the like are easily caused, and therefore, a high-performance filter core is assembled in a high-pressure fuel pipe through which high-pressure fuel flows to filter the high-pressure fuel, and the passing rate and cleanliness of the high-pressure fuel flowing through the fuel injector are ensured to meet the requirements.

In order to meet the above requirements, the present embodiment provides a filter element structure of a high-pressure common rail system, as shown in fig. 1 to 6, where the filter element structure of the high-pressure common rail system includes an oil duct 11 and a filter element 2 disposed in the oil duct 11, and the filter element 2 is used for filtering oil flowing into the oil duct 11. Wherein, oil duct 11 sets up in high-pressure pipe 1, filter core 2 sets up in oil duct 11, filter core 2 is equipped with the filter chamber 21 that is used for filtering fluid, filter chamber 21 includes annular chamber wall 22, annular chamber wall 22 sets up with the interior pipe wall of oil duct 11 relatively, be provided with a plurality of filtration pores 23 on the annular chamber wall 22, the diameter of filtration pores 23 increases along the flow direction of fluid gradually, not only can filter long and thin banding impurity effectively, but also can increase the flow that fluid permeated from the filter core, thereby the high-pressure fuel oil passing rate and the cleanliness that ensure to flow through the sprayer satisfy the requirement, fuel economy has been improved greatly.

Preferably, in the present embodiment, referring to fig. 2 to 4, the filter hole 23 is a tapered hole, and the taper coefficient k= (d 2-d 1)/H of the filter hole 23, where d1 is the diameter of the filter hole 23 on the opposite side of the annular cavity wall 22 from the oil passage 11, d2 is the diameter of the filter hole 23 on the opposite side of the annular cavity wall 22 from the filter cavity 21, and H is the depth of the filter hole 23. Since the diameter d2 of the filter hole 23 on the side of the annular cavity wall 22 facing away from the filter cavity 21 is smaller than the diameter d1 of the filter hole 23 on the side of the annular cavity wall 22 facing the oil passage 11, not only can the filter accuracy of the filter cavity 21 be improved, but also the filter element 2 has a particularly remarkable filtering effect on long-strip impurities, and the part of the filter hole 23 on the side of the annular cavity wall 22 facing the oil passage 11 can release high-pressure oil into the oil passage 11 more quickly.

In order to solve the above problem, in this embodiment, the minimum hole distance H along the axial direction of the annular cavity wall 22 is set so that the minimum distance h=d1+|k| (D1-D2)/H of the oil entering the oil channel 11 is maintained by the plurality of filter holes 23 along the axial direction of the annular cavity wall 22, where D1 is the diameter of the filter holes 23 on the opposite side of the annular cavity wall 22 from the oil channel 11, K is the taper coefficient of the filter holes 23, D1 is the diameter of the oil channel 11, D2 is the outer diameter of the annular cavity wall 22, and H is the depth of the filter holes 23, so that the oil entering the oil channel 11 is avoided by avoiding interference between the part of the filter holes 23 on the side of the annular cavity wall 22 facing the annular cavity wall 11 and the annular cavity wall 22 in the axial direction of the annular cavity wall 22.

Similarly, in the radial direction of the annular cavity wall 22, too many filter holes 23 may reduce the structural strength of the filter element 2, and the dense filter holes 23 may cause the oil entering the oil duct 11 to generate turbulence phenomenon, so as to affect the flow of high-pressure oil, so as to solve the above problem, in this embodiment, the multiple filter holes 23 are arranged at intervals along the radial direction of the annular cavity wall 22, and the minimum included angle ang= [ d2+|k| (D1-D2) ] |360/D1 |pi, where D2 is the taper coefficient of the filter holes 23 located on the opposite side of the annular cavity wall 22 to the filter cavity 21, K is the diameter of the oil duct 11, D2 is the outer diameter of the annular cavity wall 22, so that the oil flowing into the oil duct 11 and between the annular cavity wall 22 through the portions of the filter holes 23 located on the side of the annular cavity wall 22 towards the annular cavity wall 11 can not interfere with each other in the radial direction of the annular cavity wall 22, so as to avoid the occurrence of turbulence phenomenon of the oil duct entering the 11.

Further, in this embodiment, through experiments on taper holes with different taper angles, when the taper coefficient is-0.08 to-0.1, that is, the ratio of the difference of diameters of the parts of the filter holes 23 facing the filter cavity 21 and the oil duct 11 to the depth of the filter holes 23 is 2/25 to 1/10 and the diameters of the filter holes 23 in the depth direction are gradually increased, the high-pressure fuel passing rate and the cleanliness of the filter core structure of the high-pressure common rail system are best, and the value range of K is-0.08 to-0.1.

Further, in order to ensure the structural strength of the annular cavity wall 22, the maximum allowable number n=int [360/P1 ] ANG of all the filter holes 23, where Int [ ] is a function of the integer of data, P1 is the strength coefficient of the filter element 2, the strength coefficient P1 can be calibrated according to the different sizes of the filter element 2, the different materials of the filter element 2, the different types of oil, the different numbers of the filter holes 23, and the like, and is obtained by looking up the calibration data and looking up the table, in this embodiment, the value range of P1 is 1.5 to 2.

Further, in order to fully ensure the fuel passing rate of the filter element 2 when a part of the filter holes 23 are blocked or fail, in this embodiment, the minimum allowable number n=p2×d12/D22 of all the filter holes 23, where P2 is a failure coefficient, D1 is a diameter of the oil duct 11, and D2 is a diameter of the filter hole 23 on a side of the annular cavity wall 22 opposite to the filter cavity 21, where the failure coefficient P2 may be calibrated by test according to the total area of the filter holes 23, the fuel passing rate, the fuel type, and other influencing factors. In the present embodiment, the failure coefficient P2 is 1.3.

Further, in order to be convenient for the fixed of filter core 2, the filter core structure of high pressure common rail system still includes the mounting hole that is used for installing filter core 2, and the diameter d3=d1+0.05mm of mounting hole, wherein D1 is the diameter of oil duct 11 to can form the ladder structure that supports filter core 2, and then be convenient for fix a position and fix filter core 2. Preferably, the filter element structure of the high-pressure common rail system further comprises a conical transition hole 12 positioned between the oil duct 11 and the mounting hole, and the taper of the conical transition hole is 60 degrees. Suitably, the filter element 2 is provided with a mounting portion 25 and an abutting portion 24, the mounting portion 25 is matched with the mounting hole, and the abutting portion 24 can abut against the wall of the tapered transition hole 12 so as to support the filter element 2 and prevent the filter element 2 from moving under the impact of high-pressure oil.

The embodiment also provides a vehicle which comprises the filter element structure of the high-pressure common rail system, so that the vehicle has better fuel economy.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The utility model provides a filter core structure of high pressure common rail system, includes oil duct (11) and set up in filter core (2) in oil duct (11), its characterized in that, filter core (2) are equipped with filter chamber (21) that are used for filtering fluid, filter chamber (21) are including annular chamber wall (22), annular chamber wall (22) with the interior pipe wall of oil duct (11) sets up relatively, be provided with a plurality of filtration pore (23) on annular chamber wall (22), the diameter of filtration pore (23) is along the flow direction of fluid increases gradually;

the filter holes (23) are conical holes, the minimum hole distance h=d1+|K| (D1-D2)/H of the filter holes (23) along the axial direction of the annular cavity wall (22), D1 is the diameter of the filter holes (23) on the side, opposite to the oil duct (11), of the annular cavity wall (22), K is the taper coefficient of the filter holes (23), D1 is the diameter of the oil duct (11), D2 is the outer diameter of the annular cavity wall (22), H is the depth of the filter holes (23), K= (D2-D1)/H, D2 is the diameter of the filter holes (23) on the side, opposite to the filter cavity (21), of the annular cavity wall (22);

the plurality of filter holes (23) are arranged along the radial interval of the annular cavity wall (22), a minimum included angle ANG= [ d2+|K| (D1-D2) ]x360/(D1 pi), wherein D2 is the diameter of the filter holes (23) positioned on one side of the annular cavity wall (22) opposite to the filter cavity (21), K is the taper coefficient of the filter holes (23), D1 is the diameter of the oil duct (11), and D2 is the outer diameter of the annular cavity wall (22).

2. The cartridge structure of claim 1, wherein K has a value in the range of-0.08 to-0.1.

3. The filter element structure of a high pressure common rail system according to claim 1, characterized in that the maximum allowable number n=int [ 360/(P1 ANG) ] of all the filter holes (23), wherein Int [ ] is a function of the integer number of data, P1 is the intensity coefficient of the filter element (2), the value of P1 ranges from 1.5 to 2.

4. The filter element structure of a high pressure common rail system according to claim 1, characterized in that the minimum allowed number n = P2 of all the filter holes (23) is D1/D2, where P2 is a failure coefficient, D1 is the diameter of the oil channel (11), D2 is the diameter of the filter holes (23) on the side of the annular cavity wall (22) opposite to the filter cavity (21), and P2 is 1.3.

5. The filter element structure of a high-pressure common rail system according to claim 1, characterized in that it further comprises a mounting hole for mounting the filter element (2), the diameter d3=d1+0.05mm of the mounting hole, where D1 is the diameter of the oil passage (11).

6. The cartridge structure of a high pressure common rail system according to claim 5, further comprising a tapered transition hole (12) between the oil passage (11) and the mounting hole, the taper of the tapered transition hole being 60 degrees.