Compression ratio plug sealing structure applied to diesel cetane number determination machine

Abstract

The utility model discloses a compression ratio plug sealing structure for diesel cetane number determination machine, include: compression ratio plug, the appearance of compression ratio plug is cylindrical, and inside is provided with a certain length non -through inner thread, the outer circular wall of compression ratio plug has a plurality of annular sealing grooves in the front end, a plurality of high temperature -resistant sealing parts, and each high temperature -resistant sealing part is arranged in each annular sealing groove, and the telescopic structure that is connected with the inner thread of compression ratio plug, the adjustable cavity of cylinder body is inserted in the front end of compression ratio plug outer circular wall. The utility model can greatly reduce traditional cetane number compression ratio device manual carbon cleaning frequency, reduces the dismounting step, can avoid a series of coordination problems simultaneously, greatly reduces the manual labor intensity, improves the experimental accuracy.

Description

Technical Field

[0001] This utility model relates to the technical field of compression ratio adjustment to reduce carbon deposit formation and disassembly, specifically to a compression ratio plug sealing structure applied to a diesel cetane number measuring machine. Background Technology

[0002] Diesel cetane number analyzers are prone to producing a large amount of carbon deposits during operation. When the amount of carbon deposits reaches a certain level, it will affect the test process and results. Therefore, it is necessary to perform carbon cleaning and maintenance on the chamber and related components every once in a while. However, the existing compression plug sealing structure has two problems: first, the chamber sealing performance is poor during the initial test period after carbon cleaning, and oil vapor and smoke often spray out from inside; second, the conventional structure is very prone to carbon buildup, resulting in a short test time between the previous carbon cleaning and the next carbon cleaning. It is necessary to clean the chamber and the compression plug head frequently. Since the carbon cleaning process is cumbersome and frequent, it is time-consuming, labor-intensive, and delays the test time. Therefore, developing a new compression plug sealing structure is of great significance for instrument testing. Utility Model Content

[0003] The purpose of this invention is to provide a compression plug sealing structure for a diesel cetane number tester. This device aims to solve the problems of carbon buildup and subsequent external spraying after carbon removal in traditional diesel cetane number testers, and can significantly reduce the frequency of carbon removal.

[0004] To achieve the above objectives, this utility model provides a compression ratio plug sealing structure for a diesel cetane number tester, comprising: The compression ratio plug is cylindrical in shape and has a non-penetrating internal thread of a certain length inside; the front end of the outer circular wall of the compression ratio plug has several annular sealing grooves. Several high-temperature resistant seals, each installed within each annular sealing groove. A telescopic structure connected to the internal thread of the compression ratio plug; the front end of the outer circular wall of the compression ratio plug is inserted into the adjustable cavity of the cylinder.

[0005] In a preferred embodiment of the present invention, a plurality of small triangular annular grooves are provided at the top of the compression piston, and the top is a flat surface.

[0006] In a preferred embodiment of this utility model, the high-temperature resistant seal is a high-temperature resistant and wear-resistant soft seal, which is long and strip-shaped, can be bent at will, and has a rectangular cross-section.

[0007] When operating a diesel cetane number analyzer, the compression ratio needs to be adjusted by extending and retracting the compression plug to control the volume of the gas chamber. After the fuel sample is ignited in the gas chamber, a certain amount of carbon powder is formed. Some of this carbon powder is discharged from the equipment through the cylinder head exhaust port, while the remainder adheres to the inner wall of the chamber and the outer wall of the compression plug, forming carbon deposits. When these carbon deposits reach a certain amount, they can affect the testing process and results. Therefore, the compression plug sealing structure must be removed and cleaned after a certain period to ensure testing accuracy. However, traditional compression plug sealing structures accumulate carbon quickly, and after cleaning, carbon is easily sprayed outwards for a period of time before the start of a new experiment. Frequent carbon cleaning increases labor intensity and affects the overall testing process.

[0008] Due to the adoption of the above technical solution, when the diesel cetane number tester is working and adjusting the compression ratio (gas chamber volume), the electronic control system drives a series of telescopic structures to make the compression ratio plug reciprocate within the chamber. Because the high-temperature resistant sealing element is set in several annular sealing grooves at the front end of the outer circular wall of the compression ratio plug, the outer wall of the compression ratio plug is effectively made to fully contact and seal with the inner cavity of the cylinder, preventing the internal compressed gas from flowing to the compression ratio plug, effectively preventing air leakage and making the experimental data more reliable. Moreover, since the combustion gas cannot flow to the compression ratio plug, it can effectively reduce carbon deposits at that location, allowing most of the carbon deposits to be discharged from the exhaust port of the inner cavity.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The purpose of this invention is to provide a compression plug sealing structure for a diesel cetane number tester. This compression plug sealing structure aims to solve the problems of excessive carbon buildup, high frequency of carbon cleaning, and cumbersome disassembly and assembly process in traditional diesel cetane number testers, greatly reducing labor intensity. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall compression ratio plug sealing structure provided by this utility model.

[0011] Figure 2 This is a schematic diagram of the compression ratio plug installation for the compression ratio plug sealing structure provided by this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. These embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0013] See Figure 1 and Figure 2 The compression plug sealing structure shown in the figure, which is used in a diesel cetane number tester, includes: compression plug 1, high-temperature resistant seal 2, cylinder 3, and telescopic structure 4.

[0014] The compression ratio plug 1 has a certain length of non-penetrating internal thread, which is connected to the telescopic structure 4. The outer circular wall of the compression ratio plug 1 has several annular sealing grooves 12 at the front end. Each annular sealing groove 12 is provided with a high-temperature resistant seal 2. The compression ratio plug 1 and the high-temperature resistant seal 2 are installed in the adjustable cavity 3a of the cylinder body 3. The high-temperature resistant seal 2 forms a seal between the outer circular wall of the compression ratio plug 1 and the inner wall of the adjustable cavity 3a of the cylinder body 3.

[0015] The high-temperature resistant seal 2 is a soft seal that is resistant to high temperatures and wear. It is long and strip-shaped, can be bent at will, and has a rectangular cross-section.

[0016] When the diesel cetane number tester is working, the compression ratio plug 1 is moved left and right within the adjustable cavity 3a of the cylinder 3 by controlling the telescopic structure 4 to adjust the space inside the wall during the experiment, so as to achieve the compression ratio required for diesel combustion. During the experiment, a certain amount of carbon powder is formed after the combustion of oil and gas. Normally, the carbon powder should be directly discharged from the exhaust port during the experiment. However, because the conventional compression ratio plug and the adjustable cavity 3a of the cylinder 3 cannot be completely sealed, oil and gas and carbon powder will be sprayed out from this point, causing carbon deposits to form on the outer wall of the compression ratio plug. After a period of time, the compression ratio plug 3a will accumulate carbon deposits. This can easily cause jamming, sluggish movement, and affect experiments. However, the device of this utility model has several annular sealing grooves 12 at the front end of the outer circular wall of the compression plug 1. Each annular sealing groove 12 is equipped with a high-temperature resistant sealing element 2, which makes the outer circular wall of the compression plug 1 and the inner wall of the adjustable cavity 3a of the cylinder 3 form a seal, so that oil and gas cannot flow to that place, that is, it is not easy to form carbon deposits. Even if a small amount of carbon deposits are formed, during the movement of the compression plug 1, several small annular grooves 13 at the head of the compression plug 1 can scrape off the carbon deposits on the cavity and then carry them out from the exhaust port.

[0017] This invention solves the problem of carbon buildup in traditional diesel cetane number analyzers during operation. It also significantly reduces the frequency of manual carbon cleaning of traditional cetane number analyzers, reduces disassembly and assembly steps, and avoids a series of coordination problems, thereby greatly reducing labor intensity and improving experimental accuracy.

[0018] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A compression ratio plug sealing structure for use in a diesel cetane number tester, characterized in that, include: The compression ratio plug is cylindrical in shape and has a certain length of non-penetrating internal thread inside; the front end of the outer circular wall of the compression ratio plug has several annular sealing grooves. Several high-temperature resistant seals, each installed within each annular sealing groove. A telescopic structure connected to the internal thread of the compression ratio plug; the front end of the outer circular wall of the compression ratio plug is inserted into the adjustable cavity of the cylinder.

2. The compression ratio plug sealing structure for a diesel cetane number tester according to claim 1, characterized in that, Several small triangular annular grooves are provided at the top of the compression ratio piston, and the top is a flat surface.

3. The compression ratio plug sealing structure for a diesel cetane number tester according to claim 1, characterized in that, The high-temperature resistant seal is a soft seal that is resistant to high temperatures and wear. It is long and narrow, can be bent at will, and has a rectangular cross-section.

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