CN115111043A - Device and method for measuring flow of cooling engine oil entering piston top of diesel engine - Google Patents
Device and method for measuring flow of cooling engine oil entering piston top of diesel engine Download PDFInfo
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- CN115111043A CN115111043A CN202210903730.7A CN202210903730A CN115111043A CN 115111043 A CN115111043 A CN 115111043A CN 202210903730 A CN202210903730 A CN 202210903730A CN 115111043 A CN115111043 A CN 115111043A
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- Prior art keywords
- rod body
- sensor
- pressure
- storage
- connecting rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/10—Cooling by flow of coolant through pistons
Abstract
The invention provides a measuring device for the flow of cooling oil entering a piston top of a diesel engine, which comprises a first sensor for detecting a first pressure at a first position of a rod body oil passage of a connecting rod body, a second sensor for detecting a second pressure at a second position of the rod body oil passage of the connecting rod body, a first storage and measurement module which is connected with the first sensor in a communication mode and used for collecting and storing the first pressure, and a second storage and measurement module which is connected with the second sensor in a communication mode and used for collecting and storing the second pressure. And calculating the flow of the cooling oil entering the piston top of the diesel engine according to the distance between the first position and the second position, the first pressure and the second pressure. The invention also provides a method for measuring the flow of the cooling engine oil entering the piston top of the diesel engine.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a device for measuring the flow of cooling engine oil entering the piston top of a diesel engine and a method for measuring the flow of the cooling engine oil entering the piston top of the diesel engine.
Background
The piston top of the high-power diesel engine can be cooled by engine oil, the engine oil vibrates and cools in a common cooling mode, too much or too little engine oil flow entering the piston top can influence the vibration and cooling effect of the piston top, and therefore the control of the engine oil flow entering the piston top is of great importance to the cooling of the piston. The prior art generally adopts a sensor to monitor the flow change, but the sensors adopted at present are provided with wiring harnesses, and cannot be directly arranged on a moving part such as a piston to measure the characteristics of the fluid in the sensor.
In addition, with the development of computer technology, the prior art scheme is to estimate the flow of cooling engine oil entering the piston top by controlling parameters such as pressure and temperature of an inlet/outlet of a main oil gallery of a diesel engine and the like and by means of simulation calculation. The existing CAE simulation calculation results are accurate, but input boundary conditions are all in an ideal state, a plurality of uncertain factors exist in the process of machining and assembling the diesel engine, certain motion characteristics of the diesel engine cannot be completely input and simulated by calculation software, and the factors can cause the deviation of the flow rate of engine oil actually entering the piston top and the calculation results.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a device for measuring the flow of cooling oil entering the piston top of a diesel engine. The invention also aims to provide a method for measuring the flow of the cooling engine oil entering the piston top of the diesel engine.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a measuring device for the flow of cooling engine oil entering the piston top of a diesel engine, which comprises:
a first sensor for detecting a first pressure at a first position of a rod body oil passage of the connecting rod body;
a second sensor for detecting a second pressure at a second position of the rod body oil passage of the connecting rod body;
a first storage module communicatively connected with the first sensor and collecting and storing the first pressure;
a second storage and measurement module communicatively connected with the second sensor and that collects and stores the second pressure;
and calculating the flow of the cooling oil entering the piston top of the diesel engine according to the distance between the first position and the second position, the first pressure and the second pressure.
Further, still include:
the first drill hole is formed in the rod body groove of the connecting rod body and communicated with the first position, and the first sensor is arranged in the first drill hole in a sealing mode and extends into the rod body oil passage;
and the second drill hole is formed in the rod body groove of the connecting rod body and is communicated with the second position, and the second sensor is hermetically arranged in the second drill hole and extends into the rod body oil passage.
Further, the air conditioner is provided with a fan,
and sealing is respectively carried out between the first sensor and the first drilling hole and between the second sensor and the second drilling hole through sealing glue.
Further, the first sensor is a first pressure detection probe, and the second sensor is a second pressure detection probe.
Further, the air conditioner is provided with a fan,
the first storage and test module comprises:
first sensing electronics for processing the first pressure data returned by the first sensor;
a first storage device for storing data of the first pressure;
a first output terminal for connecting an external device;
the first power supply device is used for supplying power to the first storage and test module;
the second storage and test module comprises:
second sensing electronics for processing data of the second pressure transmitted back by the second sensor;
a second storage device for storing data of the second pressure;
a second output terminal for connecting the external device;
and the second power supply device is used for supplying power to the second storage and test module.
Further, the first storage and measurement module and the second storage and measurement module are respectively fixed in the rod body groove of the connecting rod body.
Further, the first storage and measurement module and the second storage and measurement module are respectively fixed in the rod body groove of the connecting rod body through oil-resistant and temperature-resistant adhesives or tapes.
The invention also provides a method for measuring the flow of cooling engine oil entering the piston top of the diesel engine, which uses the measuring device and comprises the following steps:
the method comprises the following steps: respectively determining a first position and a second position in a rod body oil passage of a connecting rod body, and measuring a distance L between the first position and the second position;
step two: detecting a first pressure P at the first position by a first sensor 1 Detecting a second pressure P at the second position by a second sensor 2 ；
Step three: the cooling oil flow Q to the diesel engine piston crown is calculated according to the following formula,
wherein A is the sectional area of the rod body oil passage; rho is the engine oil density; λ is the coefficient of fluid resistance; and D is the diameter of the rod body oil passage.
Further, the first step further comprises:
a first drill hole communicated with the first position is formed in a rod body groove of the connecting rod body, and the first sensor is arranged in the first drill hole in a sealing mode and extends into the rod body oil passage;
and a second drilling hole communicated with the second position is formed in the rod body groove of the connecting rod body, and the second sensor is arranged in the second drilling hole in a sealing manner and extends into the rod body oil passage.
Further, the second step further comprises:
and respectively fixing the first storage and measurement module and the second storage and measurement module in the rod body groove of the connecting rod body.
Compared with the prior art, the invention has the beneficial technical effects that: according to the invention, the first storage and measurement module, the second storage and measurement module, the first sensor and the second sensor are arranged at the proper positions of the rod body groove of the connecting rod body, so that the pressures at two different positions in the rod body oil passage are accurately measured, and finally, the flow of the cooling engine oil reaching the top of the diesel engine piston is accurately calculated by utilizing the pressure difference of unit length. The technical scheme of the invention is easy to implement, the measuring accuracy is high, and the measuring device is easy to install. The method can be used for verifying the accuracy of simulation calculation of the newly designed diesel engine by actually and accurately measuring the cooling oil quantity of the piston top. Further, the diesel engine with cylinder pulling and cylinder sticking can be accurately judged whether the fault is caused by insufficient flow of the cooling oil. In addition, whether the flow rates of the engine oil on the left side and the right side of the diesel engine are consistent or not can be accurately measured, and the influence of the rotation direction of the diesel engine on the flow rate of the engine oil entering the top of the piston can be judged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cooling oil flow measuring device entering the top of a piston of a diesel engine according to the present invention;
fig. 2 is a schematic view of the installation structure of the device for measuring the flow of cooling oil entering the piston crown of the diesel engine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and claims of the present disclosure or in the foregoing drawings are used for distinguishing between different objects and not for describing a particular order.
As shown in fig. 1-2, the present invention provides a device for measuring the flow of cooling oil entering the piston crown of a diesel engine, which comprises a first sensor 1, a second sensor 1 ', a first storage module 5 and a second storage module 5'. The first sensor 1 is used for detecting a first pressure at a first position 4 of the shaft oil passage 3 of the connecting rod body 2, the second sensor 1 'is used for detecting a second pressure at a second position 4' of the shaft oil passage 3 of the connecting rod body 2, the first storage and measurement module 5 is connected with the first sensor 1 in a communication mode and collects and stores the first pressure, and the second storage and measurement module 5 'is connected with the second sensor 1' in a communication mode and collects and stores the second pressure. Wherein the flow of cooling oil into the piston crown of the diesel engine is calculated on the basis of the distance between the first position 4 and the second position 4', the first pressure and the second pressure.
As shown in fig. 2, the measuring device further comprises a first bore 6 and a second bore 6'. A first bore 6 opens in a shaft groove 7 of the connecting rod shaft 2 and communicates with the first location 4, and a first sensor 1 is sealingly arranged in the first bore 6 and extends into the shaft oil passage 3. A second bore 6 ' opens in the shaft recess 7 ' of the connecting rod shaft 2 and communicates with the second location 4 ', and a second sensor 1 ' is sealingly arranged in the second bore 6 ' and extends into the shaft oil passage 3. In a preferred embodiment, the first sensor 1 and the first bore 6, and the second sensor 1 'and the second bore 6' are sealed by sealing glue, respectively, to ensure that the engine oil does not leak. In a preferred embodiment, the first sensor 1 is a first pressure detecting probe and the second sensor 1' is a second pressure detecting probe.
As shown in fig. 1, the first storage module 5 comprises a first sensing electronic component 51 for processing the data of the first pressure transmitted back by the first sensor 1, a first storage device 52 for storing the data of the first pressure, a first output terminal 53 for connecting an external device (not shown), and a first power supply device 54 for supplying power to the first storage module 5. The second storage and measurement module 5 ' comprises a second sensing electronic element 51 ' for processing the data of the second pressure transmitted back by the second sensor 1 ', a second storage device 52 ' for storing the data of the second pressure, a second output terminal 53 ' for connecting an external device, and a second power supply device 54 ' for supplying power to the second storage and measurement module 5 '. The external device is, for example, a computer or the like.
As shown in fig. 1 and 2, the first storage and measurement module 1 and the second storage and measurement module 1' are respectively fixed in a shaft groove 7 of the connecting rod body 2. In a preferred embodiment, the first storage and test module 1 and the second storage and test module 1' are respectively fixed in the rod body groove 7 of the connecting rod body 2 by oil-resistant and temperature-resistant adhesives or tapes, wherein the oil-resistant and temperature-resistant adhesives or tapes which are resistant to temperature of more than 150 ℃ are generally used for fixing so as to ensure that the connecting rod cannot fall off when moving at high speed. In addition, the first storage and test module 1 and the second storage and test module 1' are ensured to work normally under the condition of more than 150 ℃.
The invention also provides a method for measuring the flow of the cooling engine oil entering the piston top of the diesel engine, which has the general idea that: the measuring method is suitable for a diesel engine in which cooling engine oil enters a piston top through a crankshaft-connecting rod-piston pin communicating oil duct to perform a vibration cooling mode, a connecting rod of the diesel engine has an I-shaped section, and an engine oil duct 3 which is along the direction of the connecting rod body 2 and leads to the piston is arranged in the connecting rod body 2. Before measurement, the first storage and measurement module 5, the second storage and measurement module 5 'and the first sensor 1 and the second sensor 1' are required to be installed at proper positions of a rod body groove 7 of a connecting rod body 2, the first sensor 1 and the second sensor 1 'are correspondingly installed on a diesel engine along with a piston connecting rod and are subjected to a bench test, after the diesel engine runs to a specified working condition and maintains certain running time, a crankcase observation hole cover is opened or the connecting rod is detached, the first storage and measurement module 5 and the second storage and measurement module 5' are taken down, then data analysis is carried out on stored data (such as pressure at two different positions in a rod body oil passage 3), and the flow of cooling engine oil reaching the top of the piston of the diesel engine is calculated by utilizing unit length pressure difference according to data analysis results.
The measuring method of the present invention uses the above-described measuring apparatus, and specifically includes the steps of:
the method comprises the following steps: a first position 4 and a second position 4 'are respectively determined in the shaft oil passage 3 of the connecting rod shaft 2, and a distance L between the first position 4 and the second position 4' is measured. It will be appreciated by those skilled in the art that the distance L is related to the sensitivity of the first sensor 1 and the second sensor 1 ', and when the first sensor 1 and the second sensor 1' have a higher sensitivity, the distance L may be relatively small, and of course, the distance L may not be too small, depending on the actual situation, or otherwise the accuracy of the pressure measurement may be affected. When the sensitivity of the first sensor 1 and the second sensor 1' is not sufficiently high, the distance L may be relatively large to ensure accuracy of pressure detection.
Step two: detecting a first pressure P at a first location 4 by a first sensor 1 1 Detecting a second pressure P at a second location 4' by a second sensor 1 2 . As shown in figure 2 of the drawings, in which,the arrow indicates the direction in which the oil flows from the direction of the connecting rod fitting 9 toward the piston fitting 10 along the shaft oil passage 3, where the first pressure P 1 Is greater than the second pressure P 2 The value of (c).
Step three: the cooling oil flow Q to the top of the diesel engine piston is calculated according to the bernoulli equation in fluid mechanics,
wherein A is the sectional area of the rod body oil passage; rho is the engine oil density; λ is the coefficient of fluid resistance; and D is the diameter of the rod body oil passage.
In a preferred embodiment, the first step further comprises: a first drill hole 6 communicated with the first position 4 is formed in a rod body groove 7 of the connecting rod body 2, and a first sensor 1 is hermetically arranged in the first drill hole 6 and extends into the rod body oil passage 3 so as to detect a first pressure P at the first position 4 1 . A second bore 6 'communicating with the second position 4' is formed in the shank groove 7 of the connecting rod shank 2, and a second sensor 1 'is sealingly disposed in the second bore 6' and extends into the shank oil passage 3 to detect a second pressure P at the second position 4 2 . In a preferred embodiment, the second step further comprises fixing the first storage module 5 and the second storage module 5' in the shaft grooves 7 of the connecting rod shaft 2 respectively.
It will be appreciated by those skilled in the art that the first and second bores 6, 6 'and the first and second storage modules 5, 5' may be provided on the same or opposite sides of the pitman shaft 2, respectively. When disposed on the same side, the appropriate distance L needs to be determined to ensure that sufficient mounting space remains between the first and second storage modules 5, 5' on the same side of the pitman shaft 2. The first and second bores 6, 6 'and the first and second storage modules 5, 5' are preferably arranged on opposite sides of the pitman shaft 2.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. A device for measuring the flow of cooling oil into the piston crown of a diesel engine, comprising:
a first sensor for detecting a first pressure at a first position of a rod body oil passage of the connecting rod body;
a second sensor for detecting a second pressure at a second position of the rod body oil passage of the connecting rod body;
a first storage module communicatively connected with the first sensor and collecting and storing the first pressure;
a second storage and measurement module communicatively connected with the second sensor and that collects and stores the second pressure;
and calculating the flow of the cooling oil entering the piston top of the diesel engine according to the distance between the first position and the second position, the first pressure and the second pressure.
2. The measurement device of claim 1, further comprising:
the first drill hole is formed in the rod body groove of the connecting rod body and communicated with the first position, and the first sensor is arranged in the first drill hole in a sealing mode and extends into the rod body oil passage;
and the second drill hole is formed in the rod body groove of the connecting rod body and is communicated with the second position, and the second sensor is arranged in the second drill hole in a sealing mode and extends into the rod body oil passage.
3. The measurement device of claim 2,
and sealing is respectively carried out between the first sensor and the first drilling hole and between the second sensor and the second drilling hole through sealing glue.
4. A measuring device according to claim 3, wherein the first sensor is a first pressure sensing probe and the second sensor is a second pressure sensing probe.
5. The measuring device of claim 1,
the first storage and test module comprises:
first sensing electronics for processing the first pressure data returned by the first sensor;
a first storage device for storing data of the first pressure;
a first output terminal for connecting an external device;
the first power supply device is used for supplying power to the first storage and test module;
the second storage and test module comprises:
second sensing electronics for processing the second pressure data returned by the second sensor;
a second storage device for storing data of the second pressure;
a second output terminal for connecting the external device;
and the second power supply device is used for supplying power to the second storage and measurement module.
6. The measuring device of claim 5, wherein the first storage module and the second storage module are each secured within the shaft groove of the connecting rod shaft.
7. The measuring device according to claim 6, wherein the first storage and measurement module and the second storage and measurement module are respectively fixed in the shaft groove of the connecting rod body through oil-resistant and temperature-resistant adhesive or adhesive tape.
8. A method for measuring the flow of cooling oil into the piston crown of a diesel engine, characterized in that a measuring device according to any one of claims 1-7 is used, comprising the steps of:
the method comprises the following steps: respectively determining a first position and a second position in a rod body oil passage of a connecting rod body, and measuring a distance L between the first position and the second position;
step two: detecting a first pressure P at the first location by a first sensor 1 Detecting a second pressure P at the second position by a second sensor 2 ；
Step three: the cooling oil flow Q to the top of the diesel piston is calculated according to the following formula,
wherein A is the sectional area of the rod body oil passage; rho is the engine oil density; λ is the coefficient of fluid resistance; and D is the diameter of the rod body oil passage.
9. The measurement method according to claim 8, wherein step one further comprises:
a first drill hole communicated with the first position is formed in a rod body groove of the connecting rod body, and the first sensor is arranged in the first drill hole in a sealing mode and extends into the rod body oil passage;
and a second drilling hole communicated with the second position is formed in the rod body groove of the connecting rod body, and the second sensor is arranged in the second drilling hole in a sealing manner and extends into the rod body oil passage.
10. The measurement method according to claim 8, wherein the second step further comprises:
and respectively fixing the first storage and measurement module and the second storage and measurement module in the rod body groove of the connecting rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903730.7A CN115111043A (en) | 2022-07-28 | 2022-07-28 | Device and method for measuring flow of cooling engine oil entering piston top of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903730.7A CN115111043A (en) | 2022-07-28 | 2022-07-28 | Device and method for measuring flow of cooling engine oil entering piston top of diesel engine |
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| Publication Number | Publication Date |
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| CN115111043A true CN115111043A (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210903730.7A Withdrawn CN115111043A (en) | 2022-07-28 | 2022-07-28 | Device and method for measuring flow of cooling engine oil entering piston top of diesel engine |
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| CN (1) | CN115111043A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002089310A (en) * | 2000-09-14 | 2002-03-27 | Mitsubishi Motors Corp | Control device for engine |
| CN206308089U (en) * | 2016-11-04 | 2017-07-07 | 中车大连机车车辆有限公司 | Generating set cooling water chlorion monitors management optimization system |
| CN107288706A (en) * | 2017-07-06 | 2017-10-24 | 中车大连机车车辆有限公司 | High-power diesel engine moving component engine oil pressure detection method |
| CN110878721A (en) * | 2019-12-05 | 2020-03-13 | 宁波吉利罗佑发动机零部件有限公司 | Piston device, piston temperature control system and method and vehicle |
| CN111794827A (en) * | 2020-07-14 | 2020-10-20 | 第一拖拉机股份有限公司 | Diesel engine lubricating system testing device and testing method |
| CN112129360A (en) * | 2020-09-27 | 2020-12-25 | 江苏信创安全技术研究院有限公司 | Device and method for measuring gas extraction pipeline flow |
| CN114592963A (en) * | 2022-03-17 | 2022-06-07 | 潍柴动力股份有限公司 | Piston cooling system monitoring method and device and engine |
-
2022
- 2022-07-28 CN CN202210903730.7A patent/CN115111043A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002089310A (en) * | 2000-09-14 | 2002-03-27 | Mitsubishi Motors Corp | Control device for engine |
| CN206308089U (en) * | 2016-11-04 | 2017-07-07 | 中车大连机车车辆有限公司 | Generating set cooling water chlorion monitors management optimization system |
| CN107288706A (en) * | 2017-07-06 | 2017-10-24 | 中车大连机车车辆有限公司 | High-power diesel engine moving component engine oil pressure detection method |
| CN110878721A (en) * | 2019-12-05 | 2020-03-13 | 宁波吉利罗佑发动机零部件有限公司 | Piston device, piston temperature control system and method and vehicle |
| CN111794827A (en) * | 2020-07-14 | 2020-10-20 | 第一拖拉机股份有限公司 | Diesel engine lubricating system testing device and testing method |
| CN112129360A (en) * | 2020-09-27 | 2020-12-25 | 江苏信创安全技术研究院有限公司 | Device and method for measuring gas extraction pipeline flow |
| CN114592963A (en) * | 2022-03-17 | 2022-06-07 | 潍柴动力股份有限公司 | Piston cooling system monitoring method and device and engine |
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Application publication date: 20220927 |