在压缩和燃烧过程中，气门必须保证严密的密封，不能出现漏气现象，否则柴油发电机组的功率会下降，严重时柴油发电机组由于压缩终了温度和压力太低，一直不能着火启动。气门在漏气情况下工作，高温燃气长时间的冲刷进气门，使气门过热、烧损。

In the process of compression and combustion, the valve must be tightly sealed without air leakage, otherwise the power of the diesel generator set will decrease. In serious cases, the diesel generator set cannot be started on fire because the temperature and pressure at the end of compression are too low. The valve works under the condition of air leakage, and the high-temperature gas washes the inlet valve for a long time, causing the valve to overheat and burn.

气门是在高温、高机械负荷及冷却润滑困难的条件下工作的，气门头部还承受气体压力的作用，排气门还要受到高温废气的冲刷，经受废气中的硫化物的腐蚀。因此，要求气门具有足够的强度、耐高温、耐腐蚀和耐磨损的能力。

The valve works under the conditions of high temperature, high mechanical load and difficult cooling and lubrication. The valve head also bears the role of gas pressure. The exhaust valve is also scoured by high-temperature exhaust gas and corroded by sulfide in the exhaust gas. Therefore, the valve is required to have sufficient strength, high temperature resistance, corrosion resistance and wear resistance.

气门分为进气门和排气门两种。顶置式气门配气机构有每缸二气门（一个进气门、一个排气门）、三气门（两个进气门、一个排气门）、四气门（两个进气门、两个排气门）和五气门（三个进气门、两个排气门）之分。二汽门多用于中小功率的柴油发电机组；后三者用于强化程度较高的中、大型柴油发电机组，并以四气门的居多。

Valves are divided into inlet valve and exhaust valve. The overhead valve train can be divided into two valves per cylinder (one inlet valve and one exhaust valve), three valves (two inlet valves and one exhaust valve), four valves (two inlet valves and two exhaust valves) and five valves (three inlet valves and two exhaust valves). The second steam valve is mostly used for diesel generator sets with medium and small power; The latter three are used for medium and large diesel generator sets with high strengthening degree, and most of them are four valve.

进气门由于工作温度稍低，一般采用普通合金钢；排气门普遍采用热合金钢。为了节约成本，有时杆部选用一般合金钢，而头部采用热合金，然后将两者接在一起。

Because the working temperature of the intake valve is slightly lower, it is generally made of ordinary alloy steel; Hot alloy steel is widely used for exhaust valves. In order to save cost, sometimes the rod is made of general alloy steel, and the head is made of hot alloy, and then the two are connected together.

气门锥面是气门与气门之间的配合面，气门的密封性就是依靠两个表面严密贴合来保证的。此外，气门接受燃气的加热量的75％要通过锥面传出。从有利于传热的观点出发，气门锥面与气门座接触的宽度应越宽越好，但是接触面越宽，密封的可靠性就越低，因为工作面上的比压减小，杂物和硬粒不易被碾碎和排走，所以通常要求气门锥面密封环带的宽度在1～2mm之间即可。

The valve cone is the mating surface between the valve and the valve. The tightness of the valve depends on the close fitting of the two surfaces. In addition, 75% of the heating amount received by the valve is transmitted through the conical surface. From the point of view conducive to heat transfer, the wider the contact width between the valve cone and the valve seat, the better. However, the wider the contact surface, the lower the reliability of the seal. Because the specific pressure on the working surface is reduced, and the sundries and hard particles are not easy to be crushed and discharged, it is usually required that the width of the valve cone seal ring should be between 1 ~ 2mm.

气门顶面上有时还铣出一条较窄的凹槽、主要用于研磨气门时能将工具插入槽中旋转气门，气门和气门座配对进行研磨，研磨后气门即不能互换。

Sometimes a narrow groove is milled on the top surface of the valve, which is mainly used for grinding the valve. The tool can be inserted into the groove to rotate the valve. The valve and valve seat are paired for grinding, and the valves cannot be interchanged after grinding.

气门锥面的角一般为30或45，也有少数柴油发动机做成60?或15?锥角的，锥角愈小，单位面积上的压力也愈小，气门与气门座之间的相对滑动位移也较小，从而使气门的磨损减轻。因此，有的柴油发电机组进气门锥面的锥角为30?。

The angle of valve cone is generally 30 or 45, and a few diesel engines are made of 60? Or 15? The smaller the cone angle, the smaller the pressure per unit area, and the smaller the relative sliding displacement between the valve and the valve seat, so as to reduce the wear of the valve. Therefore, the cone angle of the intake valve cone of some diesel generator sets is 30 °?.

排气门曲于高温废气不断流过锥面，废气中的炭烟微粒容易沉积附着在锥面上，影响密封性，因此，排气门要求面上的比压要高些，以利于积炭的排除，气门大多采用45的锥角，为了制造和维修的方便，不少柴油发电机组进、排气门锥角都采用45。

The exhaust valve is bent at high temperature, and the exhaust gas continues to flow through the conical surface. The soot particles in the exhaust gas are easy to deposit and adhere to the conical surface, affecting the sealing. Therefore, the specific pressure on the exhaust valve surface is required to be higher to facilitate the elimination of carbon deposition. Most valves adopt a cone angle of 45. For the convenience of manufacturing and maintenance, the cone angles of inlet and exhaust valves of many diesel generator sets adopt 45.

气门座的锥角有时比气门角大0.5～1，使两者接触面积更小，可以提高工作面的比压，从而提高其密封的可靠性。

The cone angle of the valve seat is sometimes 0.5 ~ 1 larger than the valve angle, so that the contact area between the two is smaller, which can improve the specific pressure of the working face and improve the reliability of its sealing.

气门座的直径对气流的阻力影响较大。头部直径愈大，因而阻力减小。但直径的大小受气缸顶面的限制。考虑到进气阻力对柴油发电机组性能的影响比排气阻力更大，所以一般都使进气门的直径比排气门稍大。有些柴油发电机组的进、排气门直径相同，以便于制造和维修，但如果两者材料不同，则必须打上标记，以免装错。

The diameter of valve seat has a great influence on the resistance of air flow. The larger the diameter of the head, the lower the resistance. However, the diameter is limited by the cylinder top surface. Considering that the influence of intake resistance on the performance of diesel generator set is greater than exhaust resistance, the diameter of intake valve is generally slightly larger than that of exhaust valve. The inlet and exhaust valves of some diesel generator sets have the same diameter to facilitate manufacturing and maintenance, but if they are made of different materials, they must be marked to avoid wrong installation.

以上就是高斯通气门为您提供的行业信息，把握新鲜的消息，这样才能更好的服务客户,更多的精彩内容请联系我们：http://www.huannengpower.cn

The above is the industry information provided by Gauss ventilation door for you. Grasp the fresh news, so as to better serve customers. For more wonderful contents, please contact us: http://www.huannengpower.cn