Self-priming non-clogging sewage pump

ZW series self-priming non-clogging sewage pump integrates self-priming and non-clogging sewage discharge. It adopts axial return and external mixing type. It can not only need to install bottom valve and irrigation water like ordinary self-priming clean water pumps, but also can suck and discharge large amounts of water. Granular solids and long-fiber impurity liquids can be widely used in municipal construction and working principle sewage engineering, river pond aquaculture, light industry, papermaking, textile, food, chemical industry, electrical industry, fiber, slurry and mixed suspension and other chemical media. The ideal non-clogging pump.

The non-clogging sewage pump produced by our company has the characteristics of simple structure, good self-priming performance, strong sewage capacity, high efficiency and energy saving, convenient use and maintenance, etc., and its technical performance indicators are leading domestically.

The latest ZW self-priming non-clogging sewage pump adopts a direct motor connection structure, advanced design, stable operation, and reasonable structure. Its sewage discharge effect is unmatched by other self-priming sewage pumps. It has a broad application market and development prospects. .

The working principle of self-priming non-clogging sewage pump:

The pump body is provided with a liquid storage cavity, and communicates with the pump working cavity through the upper return hole and the lower circulation hole, forming the axial return external mixing system of the pump.

After the pump stops working, a certain volume of liquid has been stored in the pump cavity. When the pump is started, the liquid in the pump entrains the air and is thrown upwards under the action of the impeller. The liquid flows back to the working chamber through the grid of the gas-liquid separation pipe, and the gas is discharged out of the pump, so that a certain amount of gas is formed in the pump. The degree of vacuum achieves the effect of self-priming. During the second operation, a one-way check valve is installed at the suction port of the pump, so it can be started without adding water.

The working process of the self-priming pump is divided into 4 stages:

1. ZW self-priming non-clogging sewage pump textbook, vapor-liquid mixing process: Because the suction chamber and the discharge port have a certain height, there is always a certain amount of liquid in the pump’s liquid storage chamber. When the impeller rotates, the impeller drives the liquid into From the vapor-liquid separation chamber to the outlet, negative pressure is formed at the impeller inlet, and the air in the suction chamber and the suction pipeline enters the impeller and mixes with the high-speed rotating liquid in the impeller at the outlet of the impeller.

2. ZW self-priming non-clogging sewage pump textbook, vapor-liquid separation process: the vapor-liquid mixture enters the vapor-liquid separation chamber after passing through the pressurized water chamber. When the outlet escapes, the heavier liquid returns to the volute of the pump through the return hole connected to the pump casing due to its own gravity and negative pressure suction.

3. ZW self-priming non-clogging sewage pump textbook, recirculation process: Since there is enough liquid in the liquid storage chamber, the liquid returning to the impeller through the return hole is remixed with the air in the suction chamber to continue the above-mentioned vapor-liquid separation process. The gas in the suction pipe becomes less and less, until the gas in the suction pipe is exhausted, the pump completes the self-priming process.

4. ZW self-priming non-clogging sewage pump textbook, infusion process: After the pump completes the self-priming process, it automatically turns to infusion operation, and its working process is the same as that of an ordinary centrifugal pump.

ZW series self-priming non-clogging sewage pump integrates self-priming and non-clogging. It adopts axial flow back and external mixing. It is mainly composed of pump body, impeller, sealing cover, mechanical seal, pump shaft, inlet valve, gas-liquid separation pipe, and water addition. Valve, inlet and row 2 take over and other components.

The impeller is directly connected to the output shaft of the motor by screws, and the impeller is driven by the motor shaft to rotate in the spiral pressurized water chamber. The pump body is provided with a liquid storage chamber, which communicates with the pump working chamber through the lower return hole, forming the axial return flow external mixing system of the pump. After the pump stops working, a certain volume of liquid has been stored in the pump cavity. When the pump is started, the liquid in the pump entrains the air and is thrown upwards under the action of the impeller. The gas-liquid separation depends on the difference in the specific gravity of the liquid and the gas. The return hole flows to the working chamber, and then mixes with the gas. This cycle continues until the gas in the suction pipe is exhausted, and the pump completes the self-priming process and starts to work normally.

Ø Adopting the direct connection structure of the motor, compared with the structure of similar domestic suspension couplings, it has the advantages of simple structure, lower cost, and increased operation reliability. At the same time, it ensures that the pump is completely concentric, and the vibration and noise are small. Low.

Ø The impeller with double-blade structure is adopted, which is simple in structure, easy to manufacture and stable in operation. Because most of the impurities contained in the liquid do not pass through the impeller and go out directly from the cavity without blades, the non-blocking performance is good, and it can transport large particles such as potatoes, and the wear of the impeller is reduced accordingly.

Ø The mechanical seal adopts two single-end mechanical seals connected in series to play a double protective role. Compared with similar domestic products, this unique structure has higher operational reliability.

Ø Few moving parts, the main parts are only the pump body, pump cover, impeller and mechanical seal, which improves the reliability of operation.

Ø Simple structure, small size, small footprint, light weight, beautiful appearance, low cost, etc.

Ø The rear mouth ring structure is used to filter impurities in the sewage, avoiding damage to the mechanical seal caused by impurities in the sewage, and playing a protective role for the mechanical seal.

Ø The pump cover parts adopt spiral groove structure, which effectively prevents the damage to the mechanical seal caused by solid particles.

Use of self-priming non-clogging sewage pump

1. The ZW self-priming non-clogging sewage pump should be checked for correct rotation and flexible rotation before use.

2. Unscrew the filling screw plug on the top of the pump body. There is no need to add liquid storage after starting the machine. It should not be started when the pump has insufficient liquid storage, otherwise the pump will not work normally and the mechanical seal will be easily damaged.

3. When starting up, the outlet flow control valve should be opened first to facilitate the discharge of gas during the self-priming process. After starting, adjust the opening of the outlet flow control valve so that the pressure gauge reading points to the specified area (various pump type pressure control range tables) to avoid the pump working within the lower limit of the specified area to prevent excessive shaft power Large causes the motor to be overloaded and burned or the pump produces cavitation due to excessive flow, which affects the normal operation of the pump, and causes the pump to vibrate strongly and make noise.

4. ZW self-priming non-clogging sewage pump. During transportation and installation, check the temperature rise of the pump and motor frequently. If noise or other abnormal sounds are found, it should be shut down for inspection, and the malfunction can only be operated after the fault is discharged.

5. When shutting down, the outlet flow control valve should be closed first, and then shut down to avoid insufficient liquid storage in the pump due to the siphon effect.

6. ZW self-priming non-clogging sewage pump textbook, regular refueling, maintenance, if the pump is not used for a long time, the pump should be disassembled, cleaned and oiled, and stored properly.

Self-priming non-clogging sewage pump installation

The installation of the pump has a greater impact on the operation and life of the pump, so it must be carried out carefully. (See the schematic diagram for the standard pump pipeline installation)

1. ZW self-priming non-clogging sewage pump textbook, the installation height of the pump suction port should not exceed 5 meters as far as possible, and special attention should be paid to the sealing of the suction pipeline to avoid air leakage that affects the self-priming capacity and normal operation of the pump.

2. The outlet of the pump should be installed with a vertical pipe (usually 0.4 to 1 meter) and a pressure gauge, and then the outlet flow control valve and other pipelines should be installed.

3. Reasonably configure the length and diameter of the pump inlet and outlet pipes to reduce unnecessary head loss along the way. (You can refer to the straight pipe friction loss summary table for estimation)

4. ZW self-priming non-clogging sewage pump textbook, larger pipe diameter should be used for long-distance transportation. The pump pipeline should have its own bracket, and the pump body itself is not allowed to bear the load of the pipeline.

5. If the discharge pipeline is equipped with a check valve, it should be installed outside the outlet flow control valve.

Self-priming non-clogging sewage pump performance parameter