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Application scope of SHZ circulating water vacuum pump 2021-02-19 15:24:08
The SHZ series circulating water multi-purpose vacuum pump series use circulating water as the working fluid, and the vacuum pump that uses the fluid jet to generate negative pressure for injection has become the most popular circulating water multi-purpose vacuum pump in China. Provide vacuum conditions for evaporation, distillation, crystallization, drying, sublimation, filtration and decompression, degassing, etc. It is especially suitable for universities, research institutes, chemical engineering, medicine, biochemistry, food, pesticides, agricultural engineering, biological engineering, etc. Industry laboratories and small tests. circulating water vacuum pump features: 1. Recycle water to save precious water resources. 2. Compared with other types of vacuum pumps, it can save electricity by more than 35%. 3. A special fluid muffler can reduce the gas in the water. 4. Double taps, double meter display, can be used alone or in parallel. 5. Resistant to acid, alkali and solvent corrosion. 6. ​​The dedicated motor is produced by a well-known motor manufacturer, sealed with fluorine rubber, and no corrosive gas invades inside the motor. 7. The water in the sink needs to be replaced regularly to ensure the purity of the water, ensure the vacuum, and avoid scale stains. 8. It can be used to extract corrosive gas, and the water change cycle needs to be shortened. 9. The pump body is made of PP, and the ejector and suction nozzle are made of stainless steel, which is more suitable for acid gas.
What is the working principle of the water ring vacuum pump? 2021-02-19 15:23:41
Water ring vacuum pump (referred to as water ring pump) is a kind of rough vacuum pump. The ultimate pressure it can obtain is 2.66~9.31kPa for single-stage pump and 0.133~0.665kPa for 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 (1~2)X105Pa gauge pressure (under specific conditions). Water ring pumps are used in many processes in petroleum, chemical, machinery, mining, light industry, paper, power, metallurgy, medicine and food industries, municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, and vacuum Evaporation, vacuum concentration and vacuum regaining, etc., have been widely used. Because the process of compressing gas by the water ring pump is isothermal, it can extract flammable and explosive gases. In addition, it can also extract dust and water-containing gases. Therefore, the application of water ring pumps is increasing day by day. The impeller is installed eccentrically in the pump body. When the impeller rotates in the direction shown in the figure, the water entering the water ring pump body is thrown around by the impeller. Due to the centrifugal force, the water forms an equal thickness similar to the shape of the pump cavity. 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 just touches the top of the blade (in fact, the blade has a certain insertion depth in 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 several small cavities equal to the number of blades. If the upper part of the impeller is 0° as the starting point, then when the impeller rotates 180° before the rotation, the volume of the small cavity gradually changes from small to large (that is, from section Ⅰ-Ⅰ to Ⅱ-Ⅱ), the pressure is continuously reduced, and the suction and discharge The suction ports on the gas plate are connected. When the pressure in the small cavity space is lower than the pressure in the container to be pumped, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small cavity, and it is in suction at this time. process. When the suction is completed, it is isolated from the suction port. From the section Ⅱ-Ⅱ to Ⅲ-Ⅲ, the volume of the small cavity is gradually decreasing, and the pressure is increasing. At this time, it is in the compression process. When the compressed gas reaches the discharge ahead of time. At the time of air pressure, exhaust air from the auxiliary exhaust valve in advance. From section Ⅲ-Ⅲ to Ⅰ-Ⅰ, the volume of the small cavity connected to the exhaust port is further reduced and the pressure is further increased. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas is removed from the exhaust port. Discharge, during the continuous operation of the pump, the process of suction, compression, and exhaust is continuously carried out, so as to achieve the purpose of continuous pumping. In the water ring pump, the auxiliary exhaust valve is a special structure, generally a rubber ball valve, its function is to eliminate the phenomenon of over-compression and under-compression during the operation of the pump. Both of these phenomena will 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 air inlet and the start position of the air outlet, but these two positions are fixed Unchanging, so it does not meet the needs of changes in suction pressure. In order to solve this problem, a rubber ball valve is generally installed under the exhaust port, so that when the exhaust pressure in the pump cavity is reached prematurely, the ball valve opens automatically and the gas is discharged, eliminating the over-compression phenomenon. Generally, the lowest suction pressure is used to determine the compression ratio when designing the water ring pump, and the starting position of the exhaust port is determined by this, which solves the phenomenon of insufficient compression.
Troubleshooting of rotary vane vacuum pump 2021-02-19 15:23:09
Troubleshooting methods for rotary vane vacuum pumps: Rotary vane vacuum pumps in operation, if they are not properly operated, will often fail, such as the vacuum of the rotary vane vacuum pumps, such as reduced vacuum, oil injection, smoke, oil leakage at the oil seal, noise, etc., and the emulsification of the vacuum pump oil in the pump. . In case of such a situation, don't panic at first, wait for the shutdown to eliminate one by one according to the fault. Here are a few troubleshooting methods. 一. Rotary vane vacuum pump smoke and oil injection: refers to the smoke or oil injection from the exhaust port of the rotary vane vacuum pump during operation. 1. Smoke. If the pump has just started to run, it is normal. If it has been smoking for a long time, it is abnormal. Solution: Smoke indicates that outside the air inlet of the pump, including pipes, valves, and containers are repaired. After the leak detection is processed, the smoke will end. Vortex Flowmeter 2. Fuel injection, indicating that there are a large number of leaks outside the air inlet, and even the air inlet is exposed to the atmosphere. Solution: Seal the air inlet of the pump and make the pump run. If no oil is injected, it means there is a leak; if the exhaust valve plate is damaged, check whether the exhaust valve plate is damaged, and replace the bad exhaust valve plate. 2. Rotary vane vacuum pump noise: here refers to the noise of the pump. 1. Knocking on the cylinder, the pump makes irregular noises when it is running, like the sound of metal beating metal. This is the sound made by the rotary vane hitting the pump body. This situation is mainly caused by the spring break between the paired rotating pieces, contraction or ejection failure. Solution: Turn on the pump and check if the rotary vane spring is damaged. Replace the spring. 2. The noise of the exhaust valve plate is mainly caused by the damage of the exhaust valve plate of the pump. The solution: replace a good exhaust valve piece. 3. The vacuum degree of the rotary vane vacuum pump decreases: the measured vacuum degree of the rotary vane vacuum pump is lower than the factory index or the vacuum degree of the previous use. There are many reasons for low vacuum, here are several main situations. 1. The grade of the rotary vane vacuum pump oil added this time is different from the original one. Different vacuum pump oil grades have different results due to the different saturated vapor pressures in the oil of different grades. The solution: replace the correct new vacuum pump oil according to the product model specification. 2. In addition, the low vacuum caused by the vacuum pump oil is the emulsification and discoloration of the vacuum pump oil, or it is too dirty. Solution: Drain all the vacuum pump oil in the pump, replace the same type of vacuum pump oil, and solve the problem that water vapor and impurities in the pumped gas do not enter the pump. 3. The temperature of the pumped gas may be too high. The solution: reduce the temperature of the pumped gas, or add a corresponding heat exchanger. 4. The oil passage in the pump is blocked or not smooth, and a certain amount of oil is not maintained in the pump cavity. Solution: Check whether the oil circuit is unblocked, and add the same type of vacuum pump oil. 5. The clearance of fit is increased. This is because the long-term pumped air contains dust, etc., which causes the gap between the rotor and the stator to increase after wear. Solution: Check whether the gap is too large and replace with new parts.
Water ring vacuum pump performance 2021-02-19 15:22:40
Shanghai Shenyi Water Pump Manufacturing Co., Ltd. specializes in the production of various types of water pumps, with a high-quality modern technology team and first-class management level. It is a modern enterprise integrating production, scientific research and sales. The company has a long production history, advanced equipment, and strict testing. It has offices in more than 20 major cities across the country. Its annual sales volume reaches 30,000 sets. The products are also exported to Southeast Asian countries, West Asia and Iran. water ring vacuum pump is used to suck air and other non-corrosive, water-insoluble, solid particles-free gas, so as to form a vacuum in a closed container. A small amount of liquid is allowed to be mixed in the suction gas, which is suitable for pumping gas and water vapor. The suction pressure reaches 33Mbar absolute pressure (97% vacuum). When the vacuum pump works for a long time under the suction pressure lower than 80mbar, it should be connected The cavitation protection tube protects the pump. If equipped with an atmospheric ejector, the suction pressure can reach 10Mbar. The ejector can be directly installed on the vacuum pump. The price is favorable and the quotation is reasonable. It is an ideal choice for your vacuum pump. SZB water ring vacuum pump cannot be used to pump gas with high oxygen content, toxic or chemical interaction with pump oil. The pump and coaxial direct connection design saves space and is easy to install. The mechanical seal is used as the standard configuration to eliminate leakage, easy maintenance, stable operation, and noise can be as low as 62 decibels. The uniform corrosion resistance design, the bronze impeller improves the corrosion resistance of the pump, and the stainless steel material is more suitable for more demanding applications. The unique flexible exhaust port design will not produce over-compression, ensuring that the SZB vacuum pump has the best efficiency within its performance range. SZB water ring vacuum pump can start pumping directly from atmospheric pressure. It is widely used in electronic device manufacturing, vacuum drying, filtration, dipping, wax coating, welding, smelting, chemical industry, light industry, petroleum, medical, pharmaceutical, printing and dyeing, semiconductor, food, atomic energy, textile and other scientific research institutions, colleges and universities, Industrial and mining enterprises.
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