Today (3rd) at 06 o'clock, the tropical storm "Sura" center is located on the southern part of the East China Sea about 35 kilometers southeast of Xiapu County, Fujian Province, which is 26.4 degrees north latitude and 120.2 degrees east longitude. The maximum wind force near the center is 10 meters (25 meters / Second), the central air pressure is 985 hectopascals, and the seven-level wind radius is 300 kilometers. At 6 o'clock this morning, the tropical storm "Davi" center is located in Luannan County, Linyi City, Shandong Province, which is 35.6 degrees north latitude and 118.5 degrees east longitude. The maximum wind force near the center is 25 meters / sec (10), the center pressure is 988 kPa. The seven-level wind has a radius of 130 kilometers.
At present, Typhoon Davy has weakened into a strong tropical storm. Its center is located in Weinan, Shandong Province (35.4°N118.6°E). The center wind reaches 10 levels. It is expected to move north-northwest in the future. At night, the eastern coast of Hebei Province and the central part of the western Bohai Sea have east to southeast winds of 8 to 9 and gusts of 10, while heavy rains occur in southern Chengde, Tangshan, Qinhuangdao and eastern Zhangzhou, with heavy rains. To this end, the Hebei Provincial Meteorological Observatory issued a yellow warning signal for typhoon, please do a good job of disaster prevention such as heavy precipitation, strong winds and storm surges that may be triggered.
Affected by the weakening of typhoon Dawei, it is expected that there will be heavy rains in the south of Chengde, Tangshan, Qinhuangdao and eastern Zhangzhou during the day to night. There will be heavy rains in the local area. The precipitation will be accompanied by strong convective weather such as thunder and lightning, short-duration heavy rainfall and short-term wind. The risk of disasters such as urban floods, mountain torrents, landslides and mudslides caused by heavy precipitation is high. Please do a good job of defense.
Today (3rd) day to night, there are heavy rains in southern Chengde, Tangshan, Qinhuangdao and eastern Zhangzhou. There are heavy rains in some areas. Zhangjiakou and Baoding are cloudy in the northwest. Other areas have small to moderate rain and partial heavy rain.
Tomorrow (4th) day to night, Chengde South, Tangshan, Qinhuangdao have moderate rain, partial heavy rain, Baoding, Langfang and south areas have light rain, some have moderate to heavy rain, other areas have light rain or sporadic light rain.
On the 5th, there was light rain in the south central area and cloudy in other areas.
Rotary Rings are a type of rotating seal widely used in various rotating equipment, such as rotary joints, rotary couplings, rotary connectors, etc. Its main function is to prevent liquid or gas leakage and maintain the normal operation of the equipment. In different applications, the material, structure, sealing method, size, etc. of Rotary Rings vary to adapt to different working conditions.
The materials of Rotary Rings are mainly divided into two categories: metallic and non-metallic.
Metal materials mainly include stainless steel, steel, copper, aluminum, etc., which have characteristics of high strength, corrosion resistance, wear resistance, and are suitable for rotary seals in harsh environments such as high temperature, high pressure, and high-speed.
Non metallic materials mainly include ceramics, silicon carbide, graphite, etc., which have characteristics such as high hardness, high wear resistance, and low friction coefficient. They are suitable for rotary seals under conditions such as low temperature, low pressure, and high speed.
The structure of Rotary Rings is mainly divided into three types: unidirectional rotation, bidirectional rotation, and rotational stationary.
1. Unidirectional rotating structure
The Rotary Rings with a unidirectional rotation structure can only rotate in one direction and are suitable for devices with only unidirectional rotation.
The Rotary Rings with a bidirectional rotation structure can rotate in two directions, suitable for devices that require bidirectional rotation.
The Rotary Rings with a rotating stationary structure are composed of a rotating ring and a stationary ring. The rotating ring contacts the stationary ring during rotation to achieve sealing, suitable for equipment that requires a rotating stationary seal.
The sealing methods of Rotary Rings are mainly divided into mechanical sealing and liquid sealing.
Mechanical sealing is achieved through the contact surface between the rotating ring and the stationary ring, which has the characteristics of high reliability, long service life, and simple maintenance. It is suitable for rotary sealing in harsh environments such as high speed, high temperature, and high pressure.
Liquid sealing is achieved by injecting liquid between the rotating ring and the stationary ring, which has the characteristics of good sealing performance, low friction coefficient, and preventing dry friction. It is suitable for rotary sealing under low speed, low temperature, low pressure, and other conditions.
The size of Rotary Rings is mainly determined by the equipment requirements, including inner diameter, outer diameter, thickness, shaft diameter, etc.
Rotary Seals,Rotary Lip Seal,Rotating Shaft Seal,V Seals
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