The expressway has the characteristics of fast speed, large flow, fully enclosed, and full interchange; vehicles are required not to slow down and stop arbitrarily. Once the fog and haze weather occurs on the expressway, the visibility of the road will be reduced, which not only reduces the driver's visual recognition ability, but also causes the driver's mental fatigue, which is likely to cause judgment and operation errors, which will lead to a series of multiple vehicles rear-end serious traffic accidents. In response to fog accidents on expressways, the fog area safety monitoring system has received increasing attention. Among them, the roadside high-brightness fog lamps as the road contour indicator subsystem can effectively induce traffic flow in the fog and haze weather. led traffic warning light,Solar led traffic warning light,Solar Traffic Fog Light Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com
The impeller is eccentrically mounted in the pump body. When the impeller rotates in the direction shown, the water entering the pump body of the water ring pump is thrown around by the impeller. Due to the centrifugal force, the water forms an equal thickness similar to the shape of the pump chamber. The closed water ring. The upper inner surface of the water ring is just tangent to the impeller hub (such as the I-I section), and the lower inner surface of the water ring is just in contact with the blade tip (in fact, the blade has a certain depth of insertion within the water ring). At this time, a crescent-shaped space is formed between the impeller hub and the water ring, and this space is divided by the impeller into a plurality of small cavities equal to the number of blades. If the upper part of the impeller is 0°, the volume of the small cavity gradually increases from small to large (ie, from the section I-I to II-II), and the pressure is continuously reduced, and the suction and discharge are performed. The suction ports on the gas disk communicate with each other. When the pressure in the small cavity space is lower than the pressure in the pumped container, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small cavity, and is inhaling at this time. process. When the inhalation is completed, it is isolated from the suction port. From the II-II to III-III section, the volume of the small cavity is gradually decreasing, and the pressure is continuously increased. At this time, the compression process is in progress, when the compressed gas reaches the row in advance. When the air pressure is applied, the exhaust is advanced from the auxiliary exhaust valve. From the section III-III to I-I, the volume of the small cavity communicating with the exhaust port further reduces the further increase of the pressure. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas is taken from the exhaust port. Exhaust, during the continuous operation of the pump, the process of inhaling, compressing, and exhausting is continuously performed, thereby achieving the purpose of continuous pumping.
In the water ring pump, the auxiliary exhaust valve is a special structure, generally using a rubber ball valve, its function is to eliminate the phenomenon of excessive compression and compression caused by the pump during operation. Both of these phenomena can cause excessive power consumption. Because the water ring pump does not have a direct exhaust valve, and the exhaust pressure is always fixed, the compression ratio of the water ring pump is determined by the end position of the intake port and the starting position of the exhaust port, however these two positions are fixed. It is constant and therefore does not meet the needs of changes in suction pressure. In order to solve this problem, a rubber ball valve is generally arranged under the exhaust port, so that when the exhaust pressure is reached prematurely in the pump chamber, the ball valve is automatically opened and the gas is discharged, thereby eliminating the over-compression phenomenon. Generally, when designing the water ring pump, the compression ratio is determined by the low suction pressure of Zui, thereby determining the starting position of the exhaust port, thus solving the problem of insufficient compression.
The "foggy anti-collision small artifacts" installed on both sides of the expressway are warned by the "yellow light guide, or red light to slow down" to remind the vehicle to slow down and pass the foggy road safely. Add flashing lights and oscillating markings on important bridges, tunnels, ramps and bends, add reflective strips to guide the tunnel walls along the line, install lighting facilities on the extra-large bridges, and upstream from the beginning of the Tuanwu section. A set of vehicle distance confirmation signs will be added at ~2 kilometers, yellow flashing lights will be added near the lower crossing of the toll station and the lower crossing of the service area, and warning slogans shall be set up.
Introduction to the working principle of water ring vacuum pump
The water ring vacuum pump (referred to as the water ring pump) is a rough vacuum pump, which can obtain a limit pressure of 2.66 to 9.31 kPa for a single-stage pump and 0.133 to 0.665 kPa for a two-stage pump. The water ring pump can also be used as a compressor. It is a low pressure compressor with a pressure range of (1 to 2) X105 Pa gauge pressure (under specific conditions). Water ring pumps are used in many processes in the petroleum, chemical, machinery, mining, light industry, paper, power, metallurgy, pharmaceutical and food industries and municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum Evaporation, vacuum concentration and vacuum regain, etc., have been widely used. Because the process of compressing gas by the water ring pump is isothermal, it can remove flammable and explosive gases, and can also remove dusty and water-containing gases. Therefore, the application of the water ring pump is increasing.