CN205958208U - Engine combustion chamber gas tightness detection device - Google Patents

Abstract

The utility model discloses an air tightness detection device for an engine combustion chamber, which comprises a three-way pipe joint, a first air intake pipe, a second air intake pipe and a pressure gauge pipeline; the side end of the three-way pipe joint is connected with the first air intake pipe, The first air intake pipe includes a first steel pipe, a ball valve and a second steel pipe connected in series in sequence. One end of the first steel pipe is connected to the side end of the three-way pipe joint, and one end of the second steel pipe is connected to the compressed air source through a pipeline; the three-way pipe joint The upper end is connected with the pressure gauge pipeline. The pressure gauge pipeline includes a third steel pipe, an elbow and a pressure gauge. The lower end of the third steel pipe is connected with the upper end of the three-way pipe joint. The upper end of the third steel pipe is connected with the lower end of the elbow. Table connection; the lower end of the three-way pipe joint is connected with the upper end of the second air intake pipe, and the lower end of the second air intake pipe is connected with the combustion chamber of the engine. The utility model has the advantages of simple structure, low cost, convenient operation and use, wide application range and strong versatility. The joints are well sealed to ensure accurate test results and small errors.

Description

Engine combustion chamber air tightness detection device

technical field

The utility model relates to a detection device, in particular to a convenient air tightness detection device, which belongs to the technical field of detection tools.

Background technique

The combustion chamber of a diesel engine is composed of a piston, cylinder liner, water jacket, flame ring, cylinder gasket and cylinder head. Under the premise of ensuring that the piston ring is not damaged, the air tightness of the diesel engine combustion chamber is mainly determined by the air valve on the cylinder head. Due to the different tolerance zone of the cone angle of the air valve and the valve seat, plus the machining error generated during the machining process, the angle of the cone surface of the two is often inconsistent after assembly, and the angle of the cone surface of the valve seat cannot be guaranteed after being processed during assembly. They are exactly the same, so a tightness check needs to be performed on both. At present, the air valve seat sealing inspection method is to use blue oil to check, that is, to apply the blue oil on the cone surface of the air valve, and then assemble the air valve and the valve seat and then roll it around or use the air valve to slap the valve seat to remove it. For the air valve, observe the distribution of the blue oil on the conical surface of the valve seat. If the blue oil is evenly distributed on the valve seat, the air valve and the valve seat are well sealed, so the airtightness of the combustion chamber is good. However, because the blue oil film has a certain thickness, Inspection results are often not precise enough, and there are still errors.

Utility model content

The purpose of the utility model is to provide an engine combustion chamber air tightness detection device with simple structure and accurate detection result.

The utility model is realized through the following technical solutions:

An engine combustion chamber air tightness detection device, comprising a three-way pipe joint, a first air intake pipe, a second air intake pipe and a pressure gauge pipeline; the side end of the three-way pipe joint is connected with the first air intake pipe, and the first air intake pipe includes The first steel pipe, the ball valve and the second steel pipe, the first steel pipe, the ball valve and the second steel pipe are sequentially connected in series, one end of the first steel pipe is connected to the side end of the three-way pipe joint, and one end of the second steel pipe is connected to the compressed air source through the pipeline; The upper end of the three-way pipe joint is connected with the pressure gauge pipeline. The pressure gauge pipeline includes a third steel pipe, an elbow and a pressure gauge. The lower end of the third steel pipe is connected with the upper end of the three-way pipe joint. The upper end of the third steel pipe is connected with the lower end of the elbow. The upper end of the pipe is connected with the pressure gauge; the lower end of the three-way pipe joint is connected with the upper end of the second air intake pipe, and the lower end of the second air intake pipe is connected with the combustion chamber of the engine.

The purpose of this utility model can also be further realized through the following technical measures.

In the aforementioned airtightness detection device for the engine combustion chamber, a rubber hose clamp is provided at one end of the second steel pipe.

In the aforementioned airtightness detection device for the engine combustion chamber, the upper end of the third steel pipe is connected to the lower end of the elbow through a reducing pipe joint.

In the aforementioned airtightness detection device for the engine combustion chamber, the lower end of the second intake pipe is provided with a threaded seat pipe joint, and the threaded seat pipe joint is connected with the threaded seat hole of the indicator valve on the cylinder head of the engine combustion chamber.

In the aforementioned airtightness detection device for the engine combustion chamber, the pressure range of the compressed air source is 0.6-1.0 MPa.

The utility model has the advantages of simple structure, low cost, convenient operation and use, and portability. After the airtightness of the air valve and the valve seat is detected by the blue oil detection method, the utility model is used to recheck the airtightness of the combustion chamber of the diesel engine. During the re-inspection, remove the indicator valve on the cylinder head of the diesel engine, screw the threaded seat pipe joint at the lower end of the second intake pipe to the threaded seat hole of the indicator valve, and connect one end of the second steel pipe to the compressed air source through the hose. At this time, the intake and exhaust valves of the combustion chamber are closed, open the ball valve, and fill the combustion chamber with compressed air through the first intake pipe and the second intake pipe. When the pressure gauge reads 0.6MPa, quickly close the ball valve, and Record the reading of the pressure gauge, start timing at the same time, and measure the time required for the reading of the pressure gauge to drop from 0.6MPa to 0.5MPa in seconds. If the time is greater than 10s, the seal is qualified and the airtightness of the diesel engine combustion chamber is good. The joints of the utility model are well sealed, so that the detection result is accurate and the error is small. The lower end of the second intake pipe can be equipped with threaded seat pipe joints of various specifications through the variable diameter pipe joint to meet the air tightness inspection needs of various diesel engine combustion chambers. It has a wide range of applications and strong versatility.

The advantages and characteristics of the invention are illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a left side view of Fig. 1 .

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in FIGS. 1 and 2 , the utility model includes a three-way pipe joint 1 , a first air intake pipe 2 , a second air intake pipe 3 and a pressure gauge pipeline 4 . The left end of the three-way pipe joint 1 is connected with the first air intake pipe 2, the first air intake pipe 2 includes the first steel pipe 21, the ball valve 22 and the second steel pipe 23, and the first steel pipe 21, the ball valve 22 and the second steel pipe 23 pass through the pipe joint 25 in sequence In series connection, the right end of the first steel pipe 21 is connected with the left end of the tee pipe joint 1, the left end of the second steel pipe 23 is connected with the compressed air source through the pipeline, and the left end of the second steel pipe 23 is provided with a rubber hose clamp 24, which is a reserved interface, which can be Connect the quick connector or use the corresponding hose to directly connect with the compressed air pipe. The pressure range of the compressed air source is 0.6~1.0MPa. The upper end of the three-way pipe joint 1 is connected with the pressure gauge pipeline 4, the pressure gauge pipeline 4 includes a third steel pipe 41, an elbow 42 and a pressure gauge 43, the lower end of the third steel pipe 41 is connected with the upper end of the three-way pipe joint 1, and the third steel pipe The upper end of 41 is connected with the lower end of the elbow 42 through the reducing pipe joint 44 , and the upper end of the elbow 42 is connected with the pressure gauge 43 through the pressure gauge pipe joint 45 . The lower end of the three-way pipe joint 1 is connected with the upper end of the second intake pipe 3, the second intake pipe 3 is a steel pipe, the lower end of the second intake pipe 3 is provided with a threaded seat pipe joint 31, and the threaded seat pipe joint 31 is connected with the engine combustion chamber cylinder head. Indicator valve threaded socket connection.

In addition to the above-mentioned embodiments, the utility model can also have other implementation modes, and all technical solutions formed by equivalent replacement or equivalent transformation all fall within the scope of protection required by the utility model.

Claims (5)

1. An engine combustion chamber air tightness detection device is characterized in that: it comprises a three-way pipe joint, a first air intake pipe, a second air intake pipe and a pressure gauge pipeline; the side end of the three-way pipe joint is connected with the first air intake pipe , the first air intake pipe includes a first steel pipe, a ball valve and a second steel pipe, the first steel pipe, the ball valve and the second steel pipe are connected in series in sequence, one end of the first steel pipe is connected to the side end of the three-way pipe joint, and one end of the second steel pipe is connected to the Compressed air source connection; the upper end of the three-way pipe joint is connected to the pressure gauge pipeline, the pressure gauge pipeline includes the third steel pipe, the elbow and the pressure gauge, the lower end of the third steel pipe is connected to the upper end of the three-way pipe joint, and the upper end of the third steel pipe is connected to the The lower end of the elbow is connected, and the upper end of the elbow is connected with the pressure gauge; the lower end of the three-way pipe joint is connected with the upper end of the second air intake pipe, and the lower end of the second air intake pipe is connected with the combustion chamber of the engine. 2. The airtightness detection device of the engine combustion chamber according to claim 1, characterized in that: a rubber hose clamp is provided at one end of the second steel pipe. 3. The airtightness detection device for the engine combustion chamber according to claim 1, characterized in that: the upper end of the third steel pipe is connected to the lower end of the elbow through a variable diameter pipe joint. 4. The engine combustion chamber air tightness detection device according to claim 1, characterized in that: the lower end of the second intake pipe is provided with a threaded seat pipe joint, and the threaded seat pipe joint is connected to the cylinder head of the engine combustion chamber. Indicator valve threaded socket connection. 5 . The airtightness detection device for engine combustion chambers according to claim 1 , wherein the compressed air source pressure ranges from 0.6 to 1.0 MPa. 6 .