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SZ type water ring vacuum pump and compressor
The SZ water ring vacuum pump allows a small amount of liquid to mix with the gas it sucks in, and it is widely used in the fields of machinery, petro
Product details
SZ type water ring vacuum pump and compressor
product overview
SZ water ring vacuum pump and compressor are used to suction or compress air and other non corrosive, water-insoluble, and solid particle free gases, in order to create a vacuum and pressure in a closed container. But inhaling gas allows for the mixing of small amounts of liquid, which is widely used in the fields of machinery, petrochemicals, pharmaceuticals, food, sugar industry, and electronics.
Due to the isothermal compression of gas during the working process, it is less prone to danger when compressing and suctioning flammable and explosive gases, making its application more widespread.
working principle:
As shown in Figure 1, the impeller (1) is eccentrically installed inside the pump body (2). When starting, a certain height of water is injected into the pump. Therefore, when the impeller rotates, the water is subjected to centrifugal force and forms a rotating water ring (3) on the pump body wall. The upper inner surface of the water ring is tangent to the hub and rotates in the direction of the arrow during the first half of the rotation The inner surface of the water ring gradually separates from the hub, thus forming a space between the impeller blades and gradually expanding, so that air is sucked in at the suction port; During the second half of the rotation, the inner surface of the water ring gradually approaches the hub, and the volume of space between the blades decreases. As a result, the air between the blades is compressed and sampled. In this way, with each rotation of the impeller, the space capacity between the blades changes once, and the water between each blade reciprocates like a piston, and the pump continuously sucks in gas.
Due to the heat generated by water during operation, a portion of the water is discharged along with the gas. Therefore, the pump must continuously supply cold water to cool and replenish the water consumed inside. It is advisable to supply cold water at 15 ℃. When the gas discharged by the pump is exhaust gas, a water tank is connected to the exhaust end. After the exhaust gas and a part of the water are discharged into the water tank, the gas runs away through the outlet pipe of the water tank, and the water falls into the bottom of the water tank through the return pipe and returns to the pump for use. If the water circulation time is long, it will heat up. At this time, a certain amount of cold water needs to be supplied from the water supply of the water tank.When the compressor is in use, a gas water separator should be connected at the exhaust end. When the gas with water enters the separator, it will automatically separate, and the gas will be sent to the required place through the outlet of the separator, while the hot water will be discharged through an automatic switch. When compressing gas, it is easy to generate heat, and water becomes hot water after coming out of the pump. At the bottom of the separator, cold water should be continuously supplied to supplement the released hot water Simultaneously playing a cooling role.
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Water ring typevacuum pumpTechnical Parameter
| model | Large vacuum suction capacity (m3/min) |
Large displacement of compressor (m3/min) |
Motor Power (kw) |
Speed (r/min) | Water consumption (L/min) | High vacuum degree (%) | High pressure (Mpa) | weight (including motor) Weight |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| True emptiness is | When the pressure is (Mpa) | vacuum pump | compressor | ||||||||||||||
| 0 | 40% | 60% | 80% | 90% | 0 | 0.05 | 0.08 | 0.1 | 0.15 | ||||||||
| SZ-1 | 1.5 | 0.64 | 0.4 | 0.12 | - | 1.5 | 1 | - | - | - | 4 | 5.5 | 1440 | 10 | 84 | 0.10 | 310 |
| SZ-2 | 3.4 | 1.65 | 0.95 | 0.25 | - | 3.4 | 2.6 | 2 | 1.5 | - | 7.5 | 11 | 1440 | 30 | 87 | 0.14 | 380 |
| SZ-3 | 11.5 | 6.8 | 3.6 | 1.5 | 0.5 | 11.5 | 9.2 | 8.5 | 7.5 | 3.5 | 22 | 37 | 980 | 70 | 92 | 0.21 | 1300 |
| SZ-4 | 27 | 17.6 | 11 | 3 | 1 | 27 | 26 | 20 | 16 | 9.5 | 75 | 90 | 740 | 100 | 93 | 0.21 | 2000 |
1. The suction and exhaust volume of vacuum degree from 40% to 90% or pressure from 0.05MPa to 0.15MPa varies with the size of the water supply, the gap size between the impeller and the side cover, and the gap size between the impeller and the side cover. Especially when the flow rate is small, if the adjustment is not accurate, it is more likely to cause a smaller deviation
2. The values in the table are obtained under the following conditions: ① Water temperature of 15 ℃; ② Air temperature is 20 ℃; ③ Gas relative temperature 70%; ④ Atmospheric pressure 0.1013MPa
3. The performance deviation within the table shall not exceed 5%
SZ water ringvacuum pump(Installation size):
Installation instructions
The equipment needs to be installed according to (Figure 7, Figure 8, Figure 9, Figure 10)
1. Installation of pumps and motors:
Firstly, install the pump on the pump seat. Before installation, manually rotate the lower coupling to confirm if there is any jamming or other damage inside the pump. (When the entire pump equipment arrives at the installation site, if the packaging is damaged or damp during storage, and if the pump is installed 8 months after leaving the factory, it should be disassembled, inspected, and cleaned before installation.).
After the motor is fixed on the pump seat, the concentricity between the motor shaft and the pump shaft should be calibrated. When a ruler is placed parallel to the circumference of the coupling, it is required to be in close contact with the coupling circumference at any position on the entire circumference without any gap. When the axial clearance between the shafts of the coupling is equal, the required concentricity is achieved (see figure).
Even the slightest tilt of the pump shaft can cause serious consequences such as bearing heating and premature wear of parts. If installed correctly, the pump shaft can be easily rotated by hand after loosening the packing box.
A filtering device should be installed at the inlet of the pump to prevent particulate matter from entering the pump.
2. Installation of gas water separator:
The air-water separator is installed on the foundation according to its shape.
If it is necessary to change the installation position, attention should be paid to the connection pipeline of the separator, and the turning should not be too sharp, otherwise the flow loss of gas in the pipeline will increase, thus increasing the pressure at the pump exhaust end, reducing the flow rate and vacuum degree, and increasing power consumption.
There is a bend (4) pipe connection between the inlet pipe joint of the gas water separator and the outlet pipe joint of the pump.
The pipe with a valve is connected to the pump and the air-water separator, thereby returning the water in the separator to the pump.
The separator is connected to the water supply pipe (not shown in the figure), and a spherical valve is installed on the water supply pipe. The water supply pipe is also connected to the water supply pipe (11) of the dam material box.
3. Installation of pipeline between pump and air-water separator.
The exhaust pipe of the pump should be connected to the inlet pipe of the air-water separator. When used as a compressor, the exhaust pipe of the air-water separator should lead to the mechanism that utilizes compressed air.
When vacuuming, there is no exhaust pipe, and air is discharged to the atmosphere through the holes on the separator cover.
A gate valve should be installed on the intake pipe in front of the pump to prevent water from flowing into the intake pipe under the pressure of the exhaust pipe during parking.
When the compressor is in use, if a certain pressure is maintained in the exhaust pipe, a gate valve should also be installed on the exhaust pipe of the gas water separator.
4. Adjustment mechanism:
If the vacuum degree and flow rate of SZ-3 and SZ-4 vacuum pumps need to vary within a small range, the size of the air inlet can be adjusted. Air enters the pump's inlet chamber through the vacuum degree regulating valve (7).
This method can also be used to adjust the vacuum degree and flow rate on SZ-1 and SZ-2 vacuum pumps, using valves installed on the intake pipeline.
Spherical valves or any form of safety valve can be installed on the exhaust pipeline or gas water separator to regulate the pressure of the compressed air device.
Devices that compress various gases are not allowed to discharge these gases according to their usage conditions. A gas pipe (13) with the same diameter as the gate valve (8) installed on it should be placed between the intake and exhaust pipes to regulate the gas volume to a large extent.
STRUCTURE DESCRIPTION
The structure of the pump is shown in Figures 2, 3, and 4:
The pump consists of a pump body (1) and two side covers (2) and (3) (as shown in Figures 3 and 4). The lower part of the side cover is supported by a pump foot (a) (as shown in the figure), and the upper part consists of two pipes, namely an intake pipe (c) and an exhaust pipe (f). These two pipes are connected to the pump chamber through the suction hole (d) and exhaust hole (g) on the side cover. The intake pipe on the pump body is connected to the exhaust pipe and the suction hole and exhaust hole on the side cover. The shaft (4) is eccentrically installed in the pump body, and the impeller (6) is fixed to the shaft with a key (5). The gap between the shaft wheel and the side cover is adjusted by using the pad between the pump body and the side cover to adjust the total gap, and the shaft sleeve (17) is used to push the impeller to adjust the gap at both ends of the impeller. This gap determines the magnitude of gas loss in the flow from the inlet to the outlet inside the pump.
The packing box is equipped inside the two side covers (2) and (3). Behind the packing, there is a water chamber into which water enters through a pipe (11). Part of the water cools the packing box through the packing, while the other part enters the pump body and flows along the blade end face under the action of centrifugal force, filling the entire impeller and side cover.
The ball bearing (8) is fixed on the shaft with a round nut (9).
Start and Stop
start:
Before starting a pump that has been parked for a long time, the coupling must be manually rotated several times to confirm that there is no jamming or damage.
1. Close the gate valve (2) on the intake pipe.
2. If a gate valve (9) is installed on the exhaust pipe, it should also be closed.
3. Fill the stuffing box and gas water separator with water.
4. When the gas water separator overflows water Start the electric motor.
5. Fully open the ball valve (7) on the water supply pipeline (6) from the gas water separator to the pump.
6. Open the gate valve (9) on the exhaust pipe.
7. Open the gate valve (2) on the exhaust pipe.
8. Adjust the amount of water pumped from the air-water separator to the pump using a ball valve (7) to operate under the required technical conditions Apply for merit Low consumption.
9. Adjust the water supply from the inlet pipe to the air-water separator to consume less water and ensure the required technical specifications of the pump.
10. Adjust the water supply to the stuffing box in order to ensure the sealing of the stuffing box with minimal water consumption. When the vacuum pump operates at the maximum vacuum degree, it may produce explosive sounds due to physical effects inside the pump, but the power consumption does not increase.
The explosion sound generated as power consumption increases indicates that the pump has malfunctioned At this time, the pump should be stopped.
park
1. Close the gate valve (2) on the intake pipe.
2. Close the gate valve (9) on the exhaust pipe.
3. Turn off the electric motor.
4. Stop injecting water into the packing and gas water separator.
5. When the overflow pipe of the gas water separator stops overflowing, close the water injection pipeline to the pump.
6. Tighten the ball valve.
7. When the pump is stopped The pipe plugs on the pump and gas water separator must be unscrewed to drain the water completely.
maintenance
1. The packing should be regularly compressed. If the packing cannot guarantee the required sealing due to wear and tear, it should be replaced with new packing. The packing should not be compressed too tightly. Normally compressed packing allows water to drip out, and the amount should not be too much. Oil immersed asbestos rope should be used as packing.
2. Regularly inspect the operation and lubrication of rolling ball bearings.
3. Normal working rolling bearings should have a temperature that is 15 ℃ -20 ℃ higher than the surrounding temperature, and the temperature should not exceed 55 ℃ -60 ℃. Normal working bearings should be oiled 3-4 times a year.
Clean the bearings at least once a year and replace all lubricating oil.
Dismantling and assembly
1. Dismantling
The disassembly of the pump is divided into partial disassembly inspection and cleaning, and complete disassembly repair and replacement of parts. Before disassembling the pump, the water in the pump should be drained from the drain hole, and the pipes (11) and (5) should be removed.
When disassembling, all pads should be carefully removed. If damage occurs, new pads of the same thickness should be replaced during assembly.
The pump should be disassembled starting from the end without a coupling, in the following order:
1) Release and remove the bearing cover (14).
2) Loosen the rolling bearing and first use a hook wrench to unscrew the round nut (9). Remove the nut used to press the packing cover tightly.
3) Loosen the bearing bracket (7) from the edge of the left cover, and at the same time, turn two disassembly screws (square cylindrical end screws) to remove the bearing and bearing bracket from the shaft.
4) Disconnect the inlet pipe and pipe (10) on the side cover and loosen the connecting screws between the body and the side cover (2), as well as the double headed bolts outside the pump foot.
5) Add a pad under the pump body, then use the right side cover to separate from the pump body, and remove the side cover from the shaft (the shaft should be supported after removing the side cover).
6) Separate the pump body from the other side cover and remove it from the shaft.
The partial disassembly of the pump ends here. At this point, the working parts and other components of the pump can be inspected and cleaned. Further disassembly should continue in the following order.
7) Cut off the connection between the motor and the circuit, loosen the connection between the motor and the base, and separate it from the pump.
8) Use a hook wrench or other disassembly tool to remove the coupling from the shaft.
9) Remove the key (15) of the coupling from the shaft.
10) Remove the bearing cover.
11) Remove the positioning ring (16) or remove the round nut to loosen the rolling bearing.
12) Remove the compression nut of the packing gland.
13) Remove the bearing frame and bearing on the right side together according to Article 4.
14) Remove the shaft (4) and impeller (6) together from the pump body.
15) Unscrew the shaft sleeve nut (17) from the shaft and remove the shaft sleeve (18).
16) Remove the impeller from the shaft.
2. Assembly
Before assembly, the residue on the joint surface should be cleaned and carefully wiped dry with engine oil.
All mating surfaces and threads should be carefully wiped clean and coated with engine oil.
Remove the old oil from the bearings and bearing frames and add new oil.
When the old pad is damaged and needs to be replaced with a new pad, the thickness should be the same, and the assembly sequence should be opposite to the disassembly sequence.
The main task during assembly is to adjust the clearance between the impeller end face and the side cover. The total clearance between the two sides and three cutting edges should not exceed 0.4 millimeters for SZ-3 and SZ-4, and 0.3 millimeters for SZ-1 and SZ-2. The gap is obtained by adding a pad between the pump body (1) and the side cover (2), and the gap between the two ends of the impeller should be balanced. The shaft sleeve nut (17) can be tightened to move the impeller to ensure it.
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