all type of vacuum pump
technical data:
material: cast iron, flow: 280m
3/h; power: 185kw; temperature of air: 0--80
0 C;
sediment content of water: max 350g/m
3, PH: 2---10;
1. alias
Reciprocating vacuum pump (also known as piston vacuum pump) is dry vacuum pump. [1]
2. principles
It relies on the piston in the cylinder for reciprocating motion to suck and discharge gas. [1]
3. classification
Reciprocating vacuum pumps have two types: horizontal and vertical. But commonly used is horizontal piston vacuum pump, piston vacuum pump also has single cylinder and double cylinder points. The structure of the exhaust valve has slide valve type and free valve type. [1]
4. characteristics
The characteristic of reciprocating vacuum pumps is that they are not afraid of steam, strong and easy to operate. [1]
5. limit vacuum
But its limit vacuum is not too high.
For example, the limit vacuum of the single-stage sliding valve vacuum pump is lTorr (1 Torr = 133.321'a) and the limit vacuum of the double-stage sliding valve vacuum pump is 0.05-0.2 Torr.
Free-valve single-stage vacuum pump limit vacuum, 1020 Torr, reciprocating vacuum pump speed range, 45-20000 cubic hours.
It is mainly used for removing air or other gases from closed containers or reactors.
Reciprocating vacuum pumps are not suitable for the extraction of corrosive gases or gases with particulate ash, unless special measures are taken.
The temperature of the gas being pumped is generally not more than 35 degrees. [1]
6. the need for additional accessories.
In addition, attachments must be installed when using vacuum pumps under the following conditions:
(1) when the dust is contained in the gas, the shuttlecock must be installed before the intake pipe.
(2) when a large amount of steam is pumped out of the gas, the condenser must be installed before the intake pipe.
(3) when the corrosive gas is contained in the gas, the neutralization device must be installed before entering the vacuum pump.
(4) when the temperature of the gas being pumped exceeds 35 degrees C. The cooling device should be installed.
(5) when a large amount of liquid is extracted from the gas, the separator must be installed before the intake pipe.
(6) The starting current of the pump often exceeds several times the rated current of the motor, so it must be equipped with a commensurate starting switch. [1]
Action principle editor
Reciprocating vacuum pump structure and decompression principle Reciprocating vacuum pump structure and working principle, and reciprocating compressor is basically the same.
1. similarities
In the same way, they increase pressure by compressing low pressure gas. [1]
2. differences
The difference is that the former extracts the rarefied gas from the container and compresses it to a pressure above one atmosphere before discharging it; the latter compresses the atmospheric gas to a higher pressure and then discharges it. [1]
3. differences
In addition, they also differ in the valve train, the intake valve and the exhaust valve structure.
Reciprocating compressor, generally using spring valves; and in the reciprocating vacuum pump, the use of slide valve valve valve valve mechanism.
The compression ratio of the reciprocating vacuum pump is very high, for example, when the vacuum degree reaches 95%, the limit pressure is 5kPa. The exhaust pressure is Il2kPa. Therefore, the residual gas in the gap will have a great impact on the production capacity of the vacuum pump. Therefore, the reciprocating vacuum pump must adopt effective device to reduce the influence of clearance in structure 7, which is very different from the reciprocating vacuum pump in structure.
The reciprocating vacuum pump makes the cylinder piston move to the iron through the crank and connecting rod mechanism under the drive power of the motor.
When the piston moves from the left end to the right end of the cylinder, the density of the gas in the cylinder decreases as the volume of the left chamber increases, thus forming the pumping process. When the end moves to the left, the suction valve closes and the gas in the left cylinder is gradually compressed; when the pressure in the left cylinder reaches or slightly exceeds one atmospheric pressure, the exhaust valve is opened and the gas is discharged out of the air, thus completing a working cycle, thus reciprocating, until a certain stability is reached in the pumped container. The equilibrium pressure.
Reciprocating mechanical vacuum pump is mainly composed of gas compression parts and mechanical transmission parts.
The mechanical transmission part is mainly a crank connecting rod mechanism, which is composed of crankshaft, cross head, connecting rod, piston rod, crankcase, etc. The connecting rod connects the crankshaft journal with the cross head.
One end of the piston rod is rotated into the screw hole of the cross head, and the other end is mounted in the cone hole of the piston and fixed with nuts. When the motor drives the crankshaft to rotate through V-belt, the crankshaft rotation is changed into the piston summer movement in the cylinder through the crank-connecting rod mechanism.
The gas compression part is made up of cylinders, valves and pistons. The structure of the valve has two kinds: the movable valve and the fixed valve. The movable valve adopts a strip valve, while the fixed valve has a strip valve plate and an annular valve plate.
The cylinder side of the moving valve is provided with a square air chamber which is cast into a cylinder. The upper part of the air chamber is an air inlet, and the lower part is an exhaust object. The valves are installed inside the gas chamber, and the intake and exhaust valves are completed by the same valve. On the valve tip. A check valve is composed of a strip valve plate and a spiral spring. The whole valve is attached to the valve seat by the elastic force of the leaf spring, and the connecting valve stem extends out of the gas chamber, and the valve stem is driven to move the valve reciprocating on the valve seat by the eccentric mechanism attached to the crankshaft end, thus coordinating the opening and closing of the valve and controlling the time of inlet and exhaust, and completing the whole valve distribution action.
The fixed valve of the annular valve plate is a disc shape. It is installed in the upper and lower air chambers of the cylinder, the upper air chamber is equipped with two intake valves, and the lower air chamber is equipped with two exhaust valves, the valves are fastened by screws on the seat of their respective air chambers. The annular valve plate is tightly attached to the valve seat through the spring force of the coil spring.
First, when choosing submersible pumps, we should pay attention to its type, flow and lift. If the specifications are not suitable, it will not be able to get enough water output and the efficiency of the unit can not be brought into play. In addition, we should also know the direction of rotation of the motor, some types of submersible pumps can be reversed when the forward and reverse water, but reversal of water output is small, large current, its reversal will damage the motor winding. Electric leakage protection switch should be installed to prevent electric leakage accident of submersible pump when working under water.
Two. When installing small submersible pump, the cable should be overhead and the power cord should not be too long. When the unit is launched, do not force the cable, so as not to cause the power cord to break. The submersible pump should not sink into the mud, otherwise it will cause bad heat dissipation and burn the motor winding.
Three, try to avoid starting at low voltage. Power supply voltage and rated voltage can not be 10%, too high voltage will cause motor overheating and burn out the winding, too low voltage will reduce the motor speed, such as less than 70% of the rated speed, the start of the centrifugal switch will be closed, resulting in long-term power on the start-up winding and even burn out the windings and capacitors. Do not switch the motor frequently, this is because when the pump stops running, there will be reflux. If you start the motor immediately, the load will start, resulting in excessive starting current and burning out the winding.
4. Do not let the pump long-term overload operation, do not pump sediment-laden water, pump dehydration operation time should not be too long, in order to avoid the motor overheating and burning. During the operation of the unit, the operator must always observe whether the operating voltage and current are within the specified values on the nameplate. If not, the motor should be stopped, find out the cause and troubleshoot.
Fifth, usually check the motor, such as found cracks in the lower cover, rubber seal ring damage or failure, should be replaced or repaired in time to waterproof infiltration machine.
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