Addtime： 2020-07-16 Browse times： 2654
Rotary vane vacuum pump is a kind of mechanical vacuum pump with oil seal, which is one of the most basic vacuum equipment in vacuum technology. The rotary vane vacuum pump can remove the dry gas in the sealed container, and a certain amount of condensable gas can also be pumped out if there is a gas ballast device. However, it is not suitable for the removal of gases with high oxygen content, corrosive to metal, chemical reaction to pump oil and dust particles. There are two kinds of single-stage rotary vane vacuum pump and double-stage vacuum pump. Below, small make up for you to introduce a rotary vane vacuum pump related knowledge! The structure shows that the rotary vane vacuum pump is a positive displacement pump. It sucks in and compresses the gas through the continuous operation of the rotary vane in the pump cavity, and finally discharges the gas through the exhaust port. The pump is mainly composed of stator, rotor and rotating blade, and the rotor is eccentrically installed into the stator cavity. There are two blades in the rotor slot, and the vane spring is placed between the two blades. The intake and exhaust ports on the stator are separated into two parts by the rotor and the rotating blade. When the rotor rotates in the stator cavity, under the joint action of spring tension and its own centrifugal force, the end of the vane slides close to the inner wall of the pump chamber, periodically expands the volume of the cavity at the inlet side to inhale gas, and gradually reduces the volume of the exhaust port, compressing the inhaled gas, and then discharging from the exhaust port, so as to achieve the purpose of air extraction.
Features and scope of application features: the suction port of the vacuum pump is equipped with a coarse filter with wire mesh. It can prevent the solid foreign dust particles from being sucked into the pump chamber. The oil separator is equipped with an exhaust transition device with high efficiency oil-gas separation effect. When the pump is stopped, the suction valve built in the suction port isolates the pump from the system to prevent oil from returning into the system. The pump is air-cooled. All pumps of XD rotary vane vacuum pump are driven by direct connected motor through elastic coupling. Scope of application: 1. Vacuum pump is suitable for vacuum pumping of closed system. Such as vacuum packaging, vacuum forming, vacuum suction. 2. Inlet pressure range: 100pa-100000 PA, beyond which oil mist will be produced at the exhaust port of vacuum pump. XD rotary vane vacuum pump working environment temperature and suction gas temperature should be between 5 ℃ and 40 ℃. 3. The vacuum pump can not remove water or other liquids. Do not remove explosive, flammable, high oxygen content, corrosive gas. 4. The motor supplied generally is not explosion-proof. If explosion-proof or other special requirements are required, the motor must comply with relevant standards. Working principle rotary vane vacuum pump is mostly small and medium vacuum pump. There are two kinds of rotary vane vacuum pump: single-stage rotary vane vacuum pump and double-stage vacuum pump. The so-called two-stage rotary vane vacuum pump is to connect two single-stage pumps in series in structure. Generally, it is made of two stages to obtain higher vacuum. The relationship between pumping speed and inlet pressure of rotary vane vacuum pump is specified as follows: when the inlet pressure is 1333pa, 1.33pa and 1.33 × 10-1 (PA), the pumping speed value shall not be lower than 95%, 50% and 20% of the nominal pumping speed of the pump respectively. Figure 2 is the working principle diagram of two-stage pump, which is composed of two single-stage pumps in series. When working, the extracted gas first enters the high vacuum level through the suction cylinder. When the suction gas pressure is high, part of the gas is discharged by the exhaust valve 2, and the other part is discharged by the exhaust valve 1 through the low vacuum level. When the pressure of the inhaled gas is low, although it is compressed by high vacuum stage, the exhaust valve 2 can not be opened for exhaust. It can only be compressed by low vacuum pole and discharged by exhaust valve 1, because the limit vacuum of double-stage pump is higher than that of single-stage pump. It is widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and medicine and other production and scientific research departments. It has been widely used in the vacuum packaging of food and in the plastic industry. Printing industry paper delivery, vacuum fixture, and vacuum suction. The vacuum pump should be installed in a place with clean environment and dry air. The room temperature should be between 5 and 40 ℃. The large pump must be fixed on a solid cement foundation with bolts. 2. Before unpacking the wooden box of the pump, it is necessary to check whether the wooden box is damaged, whether the pump is damaged or not, and whether the motor is damaged and damped. In case of damage and dampness, it must be repaired and dried before installation. 3. The suction port on the upper part of the pump suction cylinder has been sealed with a metal gland before delivery. During installation, it is necessary to check whether the sealing part is damaged and whether there are impurities and dirt in the pump body. If necessary, maintenance and cleaning work should be carried out. 4. When the pump is connected with the vacuum system, the connecting pipe must be clean inside and outside, and the vacuum oil resistant rubber gasket must be used to seal the pipe joint. It is strictly forbidden to drop foreign matters into the pump. 5. Remove the protective cover and V-belt and rotate the pump pulley 2-3 times by hand to check whether the rotation is normal. Before switching on the power supply, it is necessary to check whether the power supply voltage, cycle and phase number meet the requirements of the motor nameplate. After the power supply is turned on, the rotation direction of the motor and the pump shall be the same. Install the V-belt guard. 6. Screw off the oil filling plug on the oil tank cover and fill the oil tank with vacuum oil until the oil level reaches the center line of the oil gauge. When the room temperature is too low in winter, the oil must be heated to 15 ℃ before injection. After oil injection, screw the plug. When the pump is in normal operation, the oil level in the oil tank shall be kept at the oil level line and shall not exceed. Also adopt the way of injecting vacuum oil from the suction port. The clean vacuum oil will clean the parts in the lubricating pump to make it run faster and faster. 7. After the installation, the pump should be cleaned around. The outside of the pump and motor must be wiped clean. Maintenance methods should always check the oil level and oil contamination (once a week is recommended). If the oil level is too low, stop the rotary vane vacuum pump and add appropriate vacuum pump oil to 4 / 5 of the oil window height. If the oil is contaminated, the oil will be released
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