CN112610350A - Method and device for determining eccentric chamfer of air outlet of air inlet channel of cylinder cover of diesel engine - Google Patents
Method and device for determining eccentric chamfer of air outlet of air inlet channel of cylinder cover of diesel engine Download PDFInfo
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- CN112610350A CN112610350A CN202011417772.7A CN202011417772A CN112610350A CN 112610350 A CN112610350 A CN 112610350A CN 202011417772 A CN202011417772 A CN 202011417772A CN 112610350 A CN112610350 A CN 112610350A
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- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000004088 simulation Methods 0.000 claims description 29
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 abstract description 10
- 238000005266 casting Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
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Abstract
A method and a device for determining an eccentric chamfer angle of an air inlet and an air outlet of an air inlet of a cylinder cover of a diesel engine are characterized in that a structure of a valve seat and an eccentric chamfer angle structure of the air outlet of the air inlet are intensively arranged on a simulated valve seat, then the simulated valve seat and the air outlet of the simulated air inlet are installed in a matched manner and then are installed in a matched manner with a cylinder barrel of an air passage steady flow test bed, so that the simulated valve seat rotates by different angles to enable the central line of the eccentric chamfer angle of the simulated valve seat to be located at different positions, and air passage steady flow; after testing a plurality of simulated valve seats with different eccentric distance eccentric chamfers, comparing the air passage steady flow data of the simulated valve seats with different eccentric distances at different positions of the simulated air inlet passage air outlet, and obtaining the eccentric distance and the circumferential position of the central line of the eccentric chamfers of the air inlet passage air outlet. The development period can be shortened, the development cost is reduced, the influence of the casting quality on the performance of the air passage is reduced, and the performance stability of the air passage of the diesel engine is improved.
Description
Technical Field
The invention belongs to the field of design and manufacture of internal combustion engines, and particularly relates to a method and a device for determining an eccentric chamfer angle of an air outlet of an air inlet channel of a cylinder cover of a diesel engine.
Background
With the increasing attention of people on environmental protection, the requirement of low cost and high yield of diesel engine products and the requirement of high efficiency and energy conservation in the customer market, low oil consumption and low emission are the main development targets of new development and design of diesel engines.
It is known that the shape of the air inlet duct of the diesel engine directly affects the amount of air intake into the cylinder and the strength of the swirl, thereby affecting the quality of the combustion effect in the cylinder, and therefore, greatly affecting the dynamic property, the economical efficiency and the emission characteristic of the diesel engine.
With the application of high-pressure common rail technology of 1800bar and above, the fuel spray particle size is smaller, and too high air inlet channel vortex intensity can cause the oil spray bundles to overlap, so that the combustion is deteriorated. Therefore, the combustion of the engine can be optimized and the emission is reduced only by reasonably matching the air passage swirl ratio according to the parameters of the fuel system.
In order to ensure the stability of the performance (mainly referring to the air inlet swirl ratio and the flow coefficient) of the air inlet passage of the diesel engine, the air inlet passage of the latest engine at present is designed to adopt a double-tangential air inlet passage, an eccentric chamfer is processed at the air outlet of the air inlet passage, and a higher air inlet flow coefficient can be obtained by reasonably setting the eccentric distance and the eccentric angle of the eccentric chamfer, so that the air inlet swirl ratio of a development target is met. The air inlet passage structure of the engine has the characteristics of large flow coefficient, stable air passage performance and the like.
As shown in fig. 1 and fig. 2 (fig. 2 is a view from a ' of fig. 1, fig. 1 is a cross sectional view of an engine cylinder head, the cross direction of the engine cylinder head refers to a width direction of the engine cylinder head, a direction in which a plurality of cylinders are arranged in an engine is a length direction of the engine, and is also a length direction of the engine cylinder head), an air inlet outlet eccentric chamfer 202 ' is generally disposed below a valve seat 201 ', a distance between an eccentric chamfer center line 204 ' and an air inlet valve guide rod hole center line 501 ' is referred to as an eccentric distance a ' (one point is shown on both the eccentric chamfer center line 204 ' and the air inlet valve guide rod hole center line 501 ' in fig. 2), a position of the eccentric chamfer center line 204 ' in a circumferential direction of an air inlet of the air inlet is represented by an eccentric angle b ', and the eccentric angle b ' in fig. 2 is an included angle between a point where the eccentric chamfer center line 204. For a diesel engine with a certain air inlet passage structure, different eccentric distances a 'and different eccentric angles b' have different influences on the air inlet effect of a cylinder of the diesel engine. Therefore, the determination of the proper eccentric distance a '(generally selected between 0 mm and 2 mm) and the corresponding eccentric angle b' has very important significance on the air intake effect of the diesel engine.
In the prior art, the method for determining the eccentricity distance a 'and the eccentricity angle b' needs to repeatedly manually manufacture and modify the shape of an air inlet model, and a final scheme is determined through an air passage steady flow test bench, so that the workload is large, the period is long, and the air passage performance is greatly influenced by the casting quality of an air inlet. The research and development efficiency of the diesel engine is seriously influenced, and the research and development period of the diesel engine is prolonged.
Disclosure of Invention
The invention aims to provide a method and a device for determining an eccentric chamfer angle of an air inlet and an air outlet of a cylinder cover of a diesel engine.
In order to achieve the purpose, the invention adopts the technical scheme that: the structure of a valve seat and the eccentric chamfering structure of an air inlet outlet are intensively arranged on the same simulated valve seat, then the simulated valve seat and the simulated air inlet outlet are installed in a matched manner and then are installed in a matched manner with a cylinder barrel of an air passage flow stabilizing test bed, so that the simulated valve seat rotates by different angles around the central line of the simulated valve seat to enable the eccentric chamfering central line of the simulated valve seat to be located at different positions in the circumferential direction of the simulated air inlet outlet, and meanwhile, air passage flow stabilizing data when the eccentric chamfering central line of the simulated valve seat is located at different positions in the circumferential direction of the simulated air; after a plurality of simulated valve seats with different eccentric distance eccentric chamfers and simulated air inlet channel air outlets are subjected to matching test, air passage steady flow data of the simulated valve seats with different eccentric distances at different circumferential positions of the simulated air inlet channel air outlets are compared, and therefore the required eccentric distance of the central line of the eccentric chamfers of the air inlet channel air outlets and the circumferential position of the air inlet channel air inlets are obtained.
The device for determining the eccentric chamfer angle of the air outlet of the air inlet passage of the cylinder cover of the diesel engine comprises a box body which is matched with an engine cylinder body, wherein a simulation air inlet passage and an air inlet valve guide rod hole which simulate the air inlet passage of the same cylinder barrel are arranged in the box body, the shape and the size of the simulation air inlet passage are consistent with those of an actual air inlet passage which extends to the cylinder barrel of the engine from an air inlet main pipe branch in the engine cylinder cover, and an air inlet of the simulation air inlet passage is arranged; the simulation air inlet passage air outlet is arranged on the other side surface perpendicular to the side surface where the simulation air inlet passage air inlet is arranged, a stage is arranged at the simulation air inlet passage air outlet, the step section is provided with a simulation valve seat, one end of the simulation valve seat is abutted against the stage of the stage, the other end of the simulation valve seat is flush with the corresponding side surface of the box body, and the simulation valve seat comprises an actual valve seat section which is arranged at the stage end and is consistent with the internal shape and size of the actual valve seat of the engine and an eccentric chamfer section which is connected with the actual valve seat section and simulates the eccentric chamfer of the actual air inlet passage; the eccentric chamfer section is provided with an eccentric chamfer with a certain eccentric distance, an annular groove is formed in the periphery of the simulated valve seat, a pin matched with the annular groove is arranged on the box body, the length direction of the pin is consistent with the radial direction of the annular groove, the eccentric chamfer section further comprises a plurality of simulated valve seats with different eccentric distances, and the eccentric distance refers to the eccentric amount of the central line of the eccentric chamfer in the eccentric chamfer section from the central line of the simulated valve seat.
Furthermore, an angle scale line for carrying out circumferential indexing on the simulated air inlet duct air outlet is arranged at the position, located on the periphery of the simulated valve seat, of the box body, and a pointer which is matched with the angle scale line and displays the circumferential position of the simulated valve seat is arranged on the simulated valve seat.
Further, the angle scale lines 6 are uniformly distributed along the circumferential direction of the air outlet of the simulated air inlet channel.
Furthermore, the angle scale marks 6 are arranged at intervals of 30 degrees from zero degree, and the total number is 12.
Has the advantages that:
by adopting the invention, the structure of the valve seat and the eccentric chamfer structure of the air outlet of the air inlet channel are intensively arranged on the same simulated valve seat, then replacing the simulated valve seat with different eccentric distances, and enabling the simulated valve seat to rotate in the circumferential direction of the outlet of the simulated air inlet channel, thereby obtaining the air passage steady flow test data of different combinations of eccentric chamfers and eccentric distances through tests, the eccentric distance and the eccentric angle of the eccentric chamfer of the air inlet channel corresponding to the air passage performance parameters meeting the design requirements (used for representing the position of the central line of the eccentric chamfer in the circumferential direction of the air inlet channel) can be obtained through comparison, compared with the method of repeatedly making and modifying the model by hand in the prior art, the method can shorten the development period, reduce the development cost, meanwhile, the influence of the casting quality on the performance of the air passage is greatly reduced, and the performance stability of the air passage of the diesel engine is improved.
Drawings
Fig. 1 is a transverse stepped cross-sectional view of an actual diesel engine cylinder head.
Fig. 2 is a view from a' of fig. 1.
Fig. 3 is a front view of the present invention.
Fig. 4 is a view taken along direction a in fig. 3.
Fig. 5 is a view B-B of fig. 3.
FIG. 6 is a schematic view of a simulated valve seat in half-section.
Fig. 7 is a view from direction E of fig. 6.
The labels in the figure are: 1. the device comprises a box body, 2, a simulated valve seat, 201, an actual valve seat section, 202, an eccentric chamfer section, 203, an annular groove, 204, a simulated valve seat central line, 205, an eccentric chamfer central line, 3, a pin, 4, a simulated air inlet channel, 5, an air inlet valve guide rod hole, 501, an air inlet valve guide rod hole central line, 6, an angle scale mark, 7, a pointer, 8 and a step.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to the attached figures 4-7, the device for determining the eccentric chamfer angle of the air outlet of the air inlet channel of the cylinder cover of the diesel engine comprises a box body 1 which is matched with an engine cylinder body, two simulation air inlet channels 4 which simulate the air inlet channel of the same cylinder barrel are arranged in the box body 1, and an air inlet valve guide rod hole 5 is arranged above the corresponding positions of the simulation air inlet channels 4 and the cylinder barrel.
The shape and the size of the simulated air inlet channel 4 are consistent with those of an actual air inlet channel which extends from an air inlet main pipe branch to an engine cylinder in an engine cylinder cover, and an air inlet C of the simulated air inlet channel is arranged on one side surface of the box body; the simulated air inlet outlet D is arranged on the other side surface which is vertical to the side surface where the simulated air inlet is arranged.
As shown in fig. 1, in this embodiment, the simulated air inlet passage 4 runs from the air inlet C to the air outlet D smoothly, the cross section transition is smooth, the air inlet direction is tangent to the inner wall of the cylinder barrel, and the air compressed by the supercharger can be guided into the cylinder barrel through the simulated air inlet passage and flows along the inner wall of the cylinder barrel to form a pre-vortex.
Be equipped with the platform stage in simulation intake duct gas outlet D department, the step section is equipped with simulation valve seat 2, and the one end of simulation valve seat 2 is installed with the step 8 laminating of step section, and the other end is parallel and level mutually with the corresponding side of box body 1. The inner hole of the simulated valve seat 2 comprises an actual valve seat section 201 which is arranged at the step end and is consistent with the shape and the size of the inside of an actual valve seat of an engine and an eccentric chamfer section 202 which is connected with the actual valve seat section and simulates an eccentric chamfer of an actual air inlet channel; the eccentric chamfer section 202 is provided with an eccentric chamfer with a certain eccentric distance a, and an annular groove 203 is arranged on the periphery of the simulated valve seat 2. The eccentricity distance a is shown in fig. 7, which is the eccentricity between the eccentric chamfer center line 205 and the simulated valve seat center line 204. In this figure, the eccentric chamfer center line 205 and the simulated valve seat center line 204 are shown as one point. When the simulated valve seat 2 is installed on the cartridge, the simulated valve seat centerline 204 should ideally coincide with the intake valve guide hole centerline 501.
In this embodiment, the annular groove 203 is preferably provided on the outer periphery of the actual valve seat section 201.
The box body 1 is provided with a pin 3 which is matched with the annular groove 203, and the length direction of the pin 3 is consistent with the radial direction of the annular groove 203. The pin 3 can adopt the spring pin among the prior art, need take out when simulating valve seat 2, withdraws from pin 3, when needing to install simulation valve seat 2, makes pin and ring channel 203 cooperation installation, and the pin is only the principle schematic in figure 5, and this department no longer details the pin structure.
In order to facilitate observation and recording of the circumferential position of the simulated valve seat 2 at the position of the simulated air inlet channel air outlet D, an angle scale mark 6 for circumferential indexing of the simulated air inlet channel air outlet is arranged at the position, located on the periphery of the simulated valve seat 2, on the box body 1, and a pointer 7 which is matched with the angle scale mark 6 to display the circumferential position of the simulated valve seat 2 is arranged on the simulated valve seat 2.
Specifically, pointer 7 may be provided as a notch, preferably on the opposite side of simulated valve seat centerline 204 from off-center chamfer centerline 205. Meanwhile, the notch can also be used as an operation opening for stirring the simulated valve seat 2 to rotate around the center line of the notch.
Preferably, the angle scale lines 6 are uniformly distributed along the circumferential direction of the air outlet of the simulated air inlet channel.
In this embodiment, the angle scale lines 6 are preferably arranged at intervals of 30 degrees from zero degrees, and there are 12 lines.
The valve seat comprises a plurality of simulated valve seats with different eccentric distances, wherein the eccentric distance refers to the eccentric amount of the central line of an eccentric chamfer in an eccentric chamfer section to the central line of a valve guide rod hole.
The method for determining the eccentric distance and the eccentric angle of the eccentric chamfer of the air outlet of the air inlet channel by using the embodiment comprises the following steps:
when the needle 7 of the valve retainer 2 is set to face downward in fig. 4 (corresponding to the length direction of the actual engine block), the valve eccentricity angle is 0 degrees, a test position is set every 30 degrees in the clockwise direction, and a total of 12 set points are tested.
When the test is started, the simulated valve seat ring 2 with the eccentric distance of a1 is selected to be installed on the bottom surface of the box body 1 (namely the side surface where the air outlet D of the simulated air inlet channel 4 is located), the eccentric angle is initially installed at 0 degrees, the air channel steady flow test is carried out, and the air channel steady flow test data are obtained. The airway steady flow test bed is the prior art and will not be described in detail here.
And then, adjusting the installation eccentric angle by 30 degrees clockwise, and testing according to the process to obtain the air passage steady flow test data. And by analogy, obtaining the airway steady flow test data of all 12 set points. Similarly, the simulated valve seat ring with the valve eccentric distance a2 (the eccentric distance values and the number of the eccentric distances a3, a4 and a5 … can be determined as required) is replaced, the simulated valve seat ring is installed on the bottom surface of the box body 1 according to the initial installation eccentric angle of 0 degree, the air passage flow stabilizing tests with 12 set points are sequentially carried out, and air passage flow stabilizing test data are obtained. By comparing the air passage steady flow test data of different combinations of eccentric chamfers and eccentric distances, the air passage performance parameters meeting the design requirements, namely the eccentric distance a 'and the eccentric angle b' of the eccentric chamfers of the air outlet of the air inlet passage can be obtained.
Compared with the traditional air passage development, the method for determining the eccentric distance and the eccentric angle of the eccentric chamfer of the air outlet of the air inlet passage saves the process of repeatedly making and modifying a model by hand, shortens the development period, reduces the development cost, greatly reduces the influence of the casting quality on the air passage performance, and improves the performance stability of the air passage of the diesel engine.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (5)
1. The method for determining the eccentric chamfer angle of the air outlet of the air inlet channel of the cylinder cover of the diesel engine is characterized by comprising the following steps of: the structure of a valve seat and the eccentric chamfering structure of an air inlet outlet are intensively arranged on the same simulated valve seat, then the simulated valve seat and the simulated air inlet outlet are installed in a matched manner and then are installed in a matched manner with a cylinder barrel of an air passage flow stabilizing test bed, so that the simulated valve seat rotates by different angles around the central line of the simulated valve seat to enable the eccentric chamfering central line of the simulated valve seat to be located at different positions in the circumferential direction of the simulated air inlet outlet, and meanwhile, air passage flow stabilizing data when the eccentric chamfering central line of the simulated valve seat is located at different positions in the circumferential direction of the simulated air; after a plurality of simulated valve seats with different eccentric distance eccentric chamfers and simulated air inlet channel air outlets are subjected to matching test, air passage steady flow data of the simulated valve seats with different eccentric distances at different circumferential positions of the simulated air inlet channel air outlets are compared, and therefore the required eccentric distance of the central line of the eccentric chamfers of the air inlet channel air outlets and the circumferential position of the air inlet channel air inlets are obtained.
2. Device is confirmed to eccentric chamfer in diesel engine cylinder cap intake duct gas outlet, its characterized in that: the device comprises a box body (1) which is used for being matched with an engine cylinder body, wherein a simulation air inlet channel (4) and an air inlet valve guide rod hole (5) which simulate the air inlet channel of the same cylinder barrel are arranged in the box body (1), the shape and the size of the simulation air inlet channel (4) are consistent with those of an actual air inlet channel which extends to the cylinder barrel of the engine from an air inlet main pipe branch in an engine cylinder cover, and an air inlet (C) of the simulation air inlet channel is arranged on one side surface of the box body; the simulation air inlet passage air outlet (D) is arranged on the other side surface perpendicular to the side surface where the simulation air inlet passage air inlet is arranged, a stage is arranged at the simulation air inlet passage air outlet, the step section is provided with a simulation valve seat (2), one end of the simulation valve seat (2) is abutted to the stage of the stage, the other end of the simulation valve seat is flush with the corresponding side surface of the box body (1), and the simulation valve seat (2) comprises an actual valve seat section (201) which is arranged at the stage end and is consistent with the internal shape and size of the actual valve seat of the engine and an eccentric chamfer section (202) which is connected with the actual valve seat section and simulates the eccentric chamfer of the actual air inlet; eccentric chamfer section (202) are equipped with the certain eccentric chamfer of eccentric distance, are equipped with ring channel (203) in the periphery of simulation valve seat (2), be equipped with on box body (1) with ring channel (203) cooperation installation pin (3), the length direction of pin (3) is radially unanimous with ring channel (203), still includes a plurality of simulation valve seats that have different eccentric distances, eccentric distance refers to the eccentric volume of the central line distance simulation valve seat central line of eccentric chamfer in the eccentric chamfer section.
3. The device for determining the eccentric chamfer angle of the air outlet of the air inlet channel of the cylinder cover of the diesel engine as claimed in claim 2, wherein: an angle scale mark (6) for carrying out circumferential indexing on the simulated air inlet outlet is arranged at the position, located on the periphery of the simulated valve seat (2), of the box body (1), and a pointer (7) which is matched with the angle scale mark (6) to display the circumferential position of the simulated valve seat (2) is arranged on the simulated valve seat (2).
4. The device for determining the eccentric chamfer angle of the air outlet of the air inlet channel of the cylinder cover of the diesel engine as claimed in claim 3, wherein: the angle scale marks (6) are uniformly distributed along the circumferential direction of the air outlet of the simulated air inlet channel.
5. The device for determining the eccentric chamfer angle of the air outlet of the air inlet channel of the cylinder cover of the diesel engine as claimed in claim 4, wherein: the angle scale marks (6) are arranged at intervals of 30 degrees from zero degree, and the total number is 12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417772.7A CN112610350B (en) | 2020-12-07 | 2020-12-07 | Method and device for determining eccentric chamfer angle of air outlet of air inlet channel of diesel engine cylinder cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417772.7A CN112610350B (en) | 2020-12-07 | 2020-12-07 | Method and device for determining eccentric chamfer angle of air outlet of air inlet channel of diesel engine cylinder cover |
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| CN112610350A true CN112610350A (en) | 2021-04-06 |
| CN112610350B CN112610350B (en) | 2024-02-06 |
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| CN202011417772.7A Active CN112610350B (en) | 2020-12-07 | 2020-12-07 | Method and device for determining eccentric chamfer angle of air outlet of air inlet channel of diesel engine cylinder cover |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405759A (en) * | 2021-08-19 | 2021-09-17 | 潍柴动力股份有限公司 | Air passage tumble ratio rapid adjusting device and air blowing test device and method |
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| KR20080055436A (en) * | 2006-12-15 | 2008-06-19 | 현대자동차주식회사 | Swirl control system for cylinder head |
| JP2016169713A (en) * | 2015-03-16 | 2016-09-23 | 三菱自動車工業株式会社 | Intake port structure of engine |
| CN106441911A (en) * | 2016-06-29 | 2017-02-22 | 中国北方发动机研究所(天津) | Diesel engine intake swirl adjustable test device |
| CN106918523A (en) * | 2017-04-10 | 2017-07-04 | 山东大学 | A kind of double valve valve retainer abrasion test device and method |
| CN108590872A (en) * | 2018-03-30 | 2018-09-28 | 潍柴动力股份有限公司 | The valve retainer bottom outlet and cylinder head of cylinder head |
-
2020
- 2020-12-07 CN CN202011417772.7A patent/CN112610350B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080055436A (en) * | 2006-12-15 | 2008-06-19 | 현대자동차주식회사 | Swirl control system for cylinder head |
| JP2016169713A (en) * | 2015-03-16 | 2016-09-23 | 三菱自動車工業株式会社 | Intake port structure of engine |
| CN106441911A (en) * | 2016-06-29 | 2017-02-22 | 中国北方发动机研究所(天津) | Diesel engine intake swirl adjustable test device |
| CN106918523A (en) * | 2017-04-10 | 2017-07-04 | 山东大学 | A kind of double valve valve retainer abrasion test device and method |
| CN108590872A (en) * | 2018-03-30 | 2018-09-28 | 潍柴动力股份有限公司 | The valve retainer bottom outlet and cylinder head of cylinder head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405759A (en) * | 2021-08-19 | 2021-09-17 | 潍柴动力股份有限公司 | Air passage tumble ratio rapid adjusting device and air blowing test device and method |
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