Inspection of cylinder cap leakage of diesel engine

An inspection method, diesel engine technology, applied in liquid tightness measurement using liquid/vacuum degree, testing of mechanical parts, testing of machine/structural parts, etc., can solve problems such as misjudgment, motor burnout, and inconvenient operation , to achieve the effect of high safety and reliability, good inspection effect and convenient operation

Inactive Publication Date: 2006-03-15
YANGDONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in this detection method. First of all, there are sometimes unqualified products that are not detected. There are many reasons for this. The part that is not filled with water cannot be detected; for another example, when testing this process, there may still be very small casting sand particles in the inner cavity of some workpieces. Because the aqueous solution has certain adsorption properties, when the water slowly fills the inner cavity, these The sand particles may run to the leak with the water and temporarily block the leak, causing misjudgment; another example, before this process, the copper sleeve of the injector hole of the cylinder head and all the boring holes have been sealed with sealant. The seal is sealed, but whether the seal is leaking or not, this method can't find out at all
Secondly, this method is easy to cause water splashing everywhere, the site is wet, affecting the work, it may cause a short circuit of the circuit, or an accident of burning out the motor, and it is also possible that the qualified product is misjudged as a non-conforming product due to the splashing of water.
In addition, this method also needs an external water source, which is not convenient enough to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: Steps: (a) Position and clamp the cylinder block of the diesel engine in the fixture, and at the same time seal the windows and water holes on the side of the workpiece that communicate with the water channel, and only one air inlet communicates with the pipeline; (b) through the pipe Enter the high-pressure gas with a pressure of 300Kpa adjusted by the pressure regulating valve and pressure gauge to the inner cavity of the workpiece water channel; (c) adopt the water storage device of the inner water tank in the outer water tank, the upper part of the inner water tank is sealed, and the bottom is connected with the outer water tank. Place the cylinder in the outer water tank above the inner water tank, inflate the top of the inner cavity of the inner water tank with a pressure of 300Kpa, force the water in the inner water tank to enter the outer water tank until the cylinder is submerged; (d) observe whether there are bubbles in the water, and judge Whethe...

Embodiment 2

[0010] Embodiment 2: steps: (a) position and clamp the cylinder head of the diesel engine in the fixture, and the rest are the same as Example 1; (b) input the pressure adjusted by the pressure regulating valve and the pressure gauge to the inner cavity of the water channel of the cylinder head through the pipeline. 380Kpa high-pressure gas; (c) adopt the lead screw-carrier type lifting mechanism, driven by the motor, put the cylinder head into the water storage tank, and completely submerge; (d) same as Example 1; (e) lift the cylinder head out of the water, Open the exhaust valve of the water channel of the cylinder head, and remove the cylinder head from the fixture, and the inspection is completed.

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PUM

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Abstract

A method for detecting tightness of cylinder cover on diesel engine cylinder includes positioning and clamping closely cylinder or cylinder cover in clamp and sealing water channel to reserve air inlet only, transmitting high pressure air of 300 ¿C 400 Kpa into water channel internal cavity of work piece by air piping, utilizing water storage device or lifting mechanism to submerge work piece into water, observing whether there is air bubble in water or not for judging whether work piece tightness is qualified or not.

Description

technical field [0001] The invention relates to a technique for testing the airtightness of mechanical parts, in particular to a method for testing the airtightness of a diesel engine cylinder block and cylinder cover. Background technique [0002] Cylinder block and cylinder head are one of the main parts of diesel engine. During the process of processing, checking whether there is leakage in the water channel of cylinder block and cylinder head is one of the indispensable processes in the quality inspection of diesel engine. In the past, the commonly used detection method is to use a special pressurized water machine, and the motor drives the water pump to pour water into the water channel cavity of the cylinder body and cylinder head. After adjusting the pressure of the pipeline to the required pressure, check whether there is any leakage on the surface according to the specified time. There are many disadvantages in this detection method. First of all, there are sometime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/06G01M13/00
Inventor 刘秋鹏全意曹兆粉
Owner YANGDONG CO LTD
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