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  • 卡套式管接头连接特点及密封原理
  • 本站编辑:杭州派跃威流体设备有限公司发布日期:2019-08-10 12:04 浏览次数:

青海快3目前在国内外均已采用一种结构的管道连接方式,即卡套式管接头连接方法。国家标准局于1983年颁布了全国通用的卡套式连接标准。卡套式连接的类型很多,如挤压式、撑胀式、自撑式、噬合式等。根据国家标准局颁发的标准,我国卡套式连接属于挤压式和噬合式,其结构由接头体、卡套及螺母三个零件组成。其中的关键零件是卡套—一个带有切割刃口的金属环(室内热水采暖用的卡套为橡胶卡套)。

经过对国内卡套式管接头进行研究发现,国产卡套式管接头存在以下几方面的缺陷。

1.卡套式管接头标准陈旧

我国现行的卡套式管接头标准依旧是十多年前实行的标准,在近几年来并没有依据使用的需求对其进行研究与改进。国外的卡套式管接头已经经过了多次的更新换代,而我国国产的卡套式管接头始终停留在某一个标准上,远远地落后于国外卡套式管接头的发展水平。

青海快32.就国内标准而言依旧存在缺陷

虽然我国国内的卡套式管接头标准较为陈旧与落后,但是相对于国内的这种标准而言,依旧存在着低于标准、存在缺点的问题,例如接头系列不完全、压力级别较低等,不能够对各种复杂的高压使用场合进行应付。

3.缺乏国际变径接头

青海快3当前国产卡套式管接头中没有国际变径接头,虽然有行标变径接头,但是这类接头在材料、热处理等方面存在问题,导致了结构不能够承受高压。同样的原因,B型扣压式胶管接头(与卡套式管接头配套使用)也不能够在加气站中使用。

4。不合格品比例较高

在国际规定的标准中对于卡套式管接头的卡套制造精度、刃口热处理硬度与钢管的硬度、圆度等都有较高的要求。再加上我国国内卡套式管接头生产厂家经验不足等原因,导致了不合格品比例较高,使卡套式管接头在使用的过程中出现漏气、拔脱等情况。

5。卡套式管接头装配质量不稳定

卡套式管接头装配的工艺较为复杂,需要装配人员具有较高的水平与经验,尤其是卡套式管接头预装方面。我国当前专业的预装机较少,大部分还是依靠手工进行卡套式管接头预装,工作效率较低,而且装配质量受到工人技术水平、职业素质等方面的影响,装配质量较不稳定。

At present at home and abroad has been used in a structure of pipe connection, that is, the bayonet pipe joint connection method. In 1983, the national bureau of standards issued the universal standard for card and socket connection. There are many types of sleeve connection, such as squeeze type, expansion type, self-support type, bite type, etc. According to the standards issued by the national bureau of standards, the clamp-sleeve connection in China belongs to squeeze type and bite type, and its structure consists of three parts: the connector body, clamp-sleeve and nut. One of the key components is the sleeve - a metal ring with a cutting edge (the sleeve for indoor hot water heating is rubber).

Through the research on the domestic bayonet type pipe joint, it is found that the domestic bayonet type pipe joint has the following defects.

青海快31。 The bayonet pipe joint is out of date

China's current standard of sleeve type pipe joint is still the standard implemented more than ten years ago. Foreign bayonet tube joint has been updated many times, but our domestic bayonet tube joint always stays at a certain standard, far behind the development level of foreign bayonet tube joint.

2. There are still defects in terms of domestic standards

Although the standard of the sleeve pipe connector in China is relatively old and backward, but compared with the domestic standard, there are still problems below the standard, there are shortcomings, such as incomplete connector series, lower pressure level, can not cope with a variety of complex high-pressure occasions。

3. Lack of international diameter changing joint

At present, there is no international tapered joint in the domestic bayon-sleeve pipe joint. Although there are tapered joints with standard diameters, there are some problems in the materials, heat treatment and other aspects of such joints, which lead to the structure not being able to withstand high pressure. For the same reason, type B gusset hose couplings (used in conjunction with bayonet couplings) cannot be used in filling stations.

4. A high proportion of unqualified products

In the international standard, there are high requirements for the manufacturing accuracy, heat treatment hardness of cutting edge, hardness and roundness of steel pipe。 Coupled with the lack of experience and other reasons of the domestic manufacturers of bayonet type pipe joints, leading to a high proportion of unqualified products, making the bayonet type pipe joints in the use of the process of leakage, pulling and other conditions。

5. The assembly quality of bayonet pipe joint is unstable

The assembly process of bayonet tube joint is complicated, which requires the high level and experience of the assembler, especially the pre-installation of bayonet tube joint. At present, there are few professional preassembly machines in China, and most of them rely on manual preassembly of bayonet pipe joints, which is of low working efficiency, and the assembly quality is affected by workers' technical level and professional quality, so the assembly quality is not stable.

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