ZX type horizontal clean water self-priming centrifugal pump

Flow rate: 3-350m3/h

Lift: 12-80m

Model Description: 25ZX3.2-20

25- Inlet diameter of pump

ZX - Self priming pump for clean water

3.2- Design point flow rate of pump

20- Design point head of pump

Introduction to the structural characteristics of ZX type clean water self-priming pump:

Working principle and structural description

ZX horizontal self-priming pumps all adopt an axial liquid return pump body structure. The pump body consists of a suction chamber, a storage chamber, a scroll chamber, a return port, a gas-liquid separation chamber, etc After the pump starts normally The impeller sucks in the liquid stored in the suction chamber and the air in the suction pipeline together, and the well is completely mixed inside the impeller under the action of centrifugal force The liquid carries the gas to the outer edge of the scroll chamber and forms a white foam belt with a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through a diffusion tube. At this point, due to a sudden decrease in flow rate, lighter gases are separated from the mixed gas-liquid mixture The gas continues to rise and be discharged through the pump body outlet. The degassed liquid returns to the storage chamber and enters the impeller again through the reflux hole, where it mixes with the gas sucked in from the suction pipeline inside the impeller. Under the action of the high-speed rotating impeller, it flows towards the outer edge of the impeller. As this process repeats itself, the amount of air sucked into the pipeline decreases continuously Until the gas is completely absorbed and the self-priming process is completed, the pump is put into normal operation.

Some pumps do not have cooling chambers at the bottom of their bearing bodies. When the bearing heats up and causes the temperature of the bearing to rise above 70 ℃, coolant can be injected into the cooling chamber through any coolant pipe joint for circulating cooling. The sealing mechanism inside the pump to prevent liquid leakage from the high-pressure area to the low-pressure area is the front and rear sealing rings. The front sealing ring is installed on the pump body, and the rear sealing ring is installed on the bearing body. When the pump runs for a long time and the sealing rings wear out to a certain extent And it affects the efficiency and self-priming performance of the pump Should be replaced.

The ZX horizontal self-priming centrifugal pump has the advantages of compact structure, easy operation, stable operation, easy maintenance, high efficiency, long service life, and strong self-priming ability. There is no need to install a bottom valve in the pipeline. Before operation, it is only necessary to ensure that a certain amount of liquid is stored in the pump body. Therefore, self-priming centrifugal pumps simplify the piping system and improve working conditions. The basic structure of ZX type clean water self-priming pump is pump, motor, and base, among which the pump is composed of impeller, shaft sleeve, pump shaft, seal, etc. The sealing method is mechanical sealing.

Scope of application:

Suitable for urban environmental protection, construction, fire protection, chemical, pharmaceutical, dye printing and dyeing, brewing, electricity, electroplating, papermaking, petroleum, mining, equipment cooling, oil tanker unloading, etc.

Suitable for clear water, seawater, chemical media liquids with acid and alkalinity, and slurries with general paste (medium viscosity ≤ 100 cP, solid content up to 30% or less).

Equipped with a rocker nozzle, the water can be washed into the air and dispersed into small raindrops for spray. It is a good machine for pesticides, nurseries, orchards and tea gardens.

It can be used in conjunction with any type and specification of filter press, and is the most ideal pump for feeding slurry to the filter press for pressure filtration.

Performance Graph:

　　Installation dimensions

1. Pump 2. Pressure gauge 3. Outlet vertical pipe 4. Suction hard throat pipe 5. Elbow 6. Flow control valve 7. Outlet pipeline 8. Liquid filling plug 9. Vacuum gauge

1. When the pump and motor are directly connected for transmission, attention should be paid to the coaxiality of the pump shaft and the output of the motor; The accuracy of pump installation is crucial for the smooth operation of the pump

Sex and service life have a significant impact, so careful installation and calibration are necessary.

2. The pump coupling must be securely fastened with screws and nuts to prevent loosening, otherwise it may cause impeller movement and mechanical failure.

3. In order to maintain a certain amount of stored liquid in the pump body, achieve good self-priming ability, and prevent dry friction of mechanical seals, it is necessary to make the pump

The inlet is higher than the centerline of the pump shaft.

4. The installation of the suction pipeline should note:

a. The installation height of the suction port should not exceed 5 meters. When conditions permit, the installation height of the suction port should be as low as possible below the lowest water storage level of the pool and as low as possible? Is it beneficial to shorten the length of the suction pipe and install fewer bends? Short self-priming time to improve self-priming function.

b. Valves, flanges, etc. in the suction pipeline should be strictly guarded against air leakage or liquid leakage, that is, there should be no air leakage in the suction pipeline.

c. Solid and other debris should be prevented from being sucked into the pump body, and a filter should be installed on the suction pipeline for this purpose. The effective flow area of the filter should be 2-3 times the cross-sectional area of the suction pipe, and the filter should be regularly inspected?.

d. The suction and discharge pipelines should have their own supports, and the pump body itself is not allowed to bear the load of the pipelines.

5. When installing the pump, the static grounding resistance of the pump and pipeline should meet its specified requirements.

6. During installation, it is necessary to strictly inspect the pump casing and pipelines for any stones, iron sand, or other debris.

7. Correct the installation clearance and coaxiality of the pump coupling and motor coupling, with a permissible deviation of 0.1 millimeters for different axial degrees. The height difference between the pump shaft and the motor shaft can be adjusted by placing copper or iron pads on the feet.

8. After 3-4 hours of actual operation of the unit, a final inspection should be conducted. If there are no adverse phenomena, it is considered that the installation is done properly. During the trial operation, the temperature of the bearings should be checked, and the temperature of the bearing body should not exceed 70 ℃.

9. The bearing body of the pump is equipped with a cooling chamber device and a cooling water joint for fitting rubber or plastic pipes with an inner hole of Φ 12. The thread size is M12 × 1.75.

10. If a one-way valve is installed on the outlet pipeline of the pump and the pump cannot smoothly discharge gas during the self-priming process, an exhaust pipe and valve should be added at the outlet of the pump

Pump usage:

（1） Preparation and inspection work before starting:

1. This series of self-priming pumps is lubricated with high-quality calcium based butter and No. 10 engine oil according to the working and operating conditions of the pump. If a pump lubricated with butter is used, butter should be regularly added to the bearing box A pump lubricated with engine oil If the oil level is insufficient, add enough.

2. Check if the liquid storage inside the pump casing is higher than the upper edge of the impeller If it is insufficient The storage fluid can be directly injected into the pump body from the filling port on the pump casing. It should not be started and operated when the storage fluid is insufficient, otherwise the pump cannot work normally and the mechanical seal may be damaged.

3. Check whether the rotating parts of the pump are stuck or subject to magnetic impact.

4. Check if there is any looseness in the nuts of the pump body feet and various connections.

5. Check the coaxiality and parallelism between the pump shaft and the motor shaft.

6. Check if there is any air leakage in the inlet pipeline, and if there is any, try to eliminate it.

7. Open the valve of the suction pipeline Slightly open (do not fully open) the outlet control valve

　　（2） Starting and operation:

1. Tap the self-priming pump and pay attention to whether the direction of the pump shaft is correct.

2. Pay attention to any abnormal sounds and vibrations during rotation.

3. Pay attention to the readings of the pressure gauge and vacuum gauge After starting, when the readings of the pressure gauge and vacuum gauge fluctuate for a period of time and indicate stability, it indicates that the pump has been filled with liquid and entered normal infusion operation.

4. During the self suction process before the pump enters normal infusion operation Special attention should be paid to the increase in water temperature inside the pump. If this process is too long and the water temperature inside the pump is too high, stop the pump and check the cause.

If the liquid temperature inside the pump is too high and causes difficulty in self-priming So we can temporarily shut down Use the liquid in the discharge pipeline to flow back into the pump or directly replenish the liquid into the pump through the storage port on the pump body Cool down the liquid inside the pump Then start it up.

6. If the pump experiences strong vibration and exposure during operation It is possible that cavitation occurs in the pump, and there are two reasons for cavitation: one is excessive flow velocity in the inlet pipe The second issue is that the suction distance is too high. When the flow rate is too high, the outlet control valve can be adjusted Raise the pressure gauge reading. If there is a blockage in the inlet pipeline, it should be promptly eliminated. If the suction stroke is too high, the installation height of the pump can be appropriately reduced.

7. The pump stopped for some reason during operation When it needs to be restarted The outlet control valve should be slightly open (not fully closed) to facilitate the discharge of gas from the outlet during the self-priming process and ensure that the pump starts under lighter loads.

8. Pay attention to checking whether there is any leakage in the pipeline system

（3） Stop the pump:

Firstly, the gate valve on the discharge pipeline must be closed.

2. Stop the pump from rotating.

During the cold season, the liquid stored in the pump body and the water in the cooling chamber of the bearing body should be emptied to prevent freezing and cracking of the components.