The secondary impeller shaft seal pump equipped with an oil cup should be regularly filled with oil to lubricate the internal packing or lip seal ring. It is necessary to adjust the gap between the impeller and the front guard plate in a timely manner. The gap between the metal lined pump impeller and the front guard plate should be between 0.5mm and 1mm, and the gap between the rubber lined pump impeller and the front and rear guards should be equal.

The flow head curve of particles in a centrifugal slurry pump is gentle, and the flow resistance loss in the pipeline slowly increases with the increase of flow rate. The angle between the pipeline characteristic curve and performance curve is very small, ensuring that a small change will bring about significant changes in current.

The design requirements for the feed pump of the filter press should be based on the process flow and water supply and drainage requirements. The following is a summary: it should be considered from five aspects, including liquid delivery capacity, device head, liquid properties, pipeline layout, and operating conditions.

The head required for the installation system is another important performance data for selecting pumps, and generally the head should be selected by amplifying the margin by 5% to 10%.

The pipeline layout conditions of the device system refer to the liquid delivery height, distance, direction, suction side low liquid level, discharge side high liquid level and other data, as well as pipeline specifications and their lengths, materials, pipe fittings specifications, quantities, etc., in order to calculate the comb head and verify the cavitation allowance.

There are many conditions that need to be met, such as the saturation vapor force P of the liquid T, the suction side pressure PS (* * *), the discharge side container pressure PZ, the altitude, whether the ambient temperature is intermittent or continuous, and whether the pump position is fixed or movable.

Introduction to ZJ slurry pump: Pump body, pump cover, and flow passage components: This series of pumps is a horizontal, vertical, double shell structure slurry pump. The pump body and pump cover are equipped with replaceable metal lining, which is made of high chromium wear-resistant alloy material. The lining can be used until worn through, extending the maintenance cycle and reducing operating costs. The outlet direction of the pump can be rotated and installed at 8 angles. Solid material pipeline hydraulic transportation technology has a development history of more than 120 years, and centrifugal slurry pump is a key equipment for pipeline hydraulic transportation, widely used in various sectors of the national economy. At the same time, the device is developing towards large-scale direction. Currently, in the process of use, the key problems that slurry pumps urgently need to solve mainly focus on the following three aspects: firstly, extending the service life of slurry pumps,

Before trial operation, the coupling or shaft should be manually turned to check for flexibility. If there is no movement or abnormal noise, it should be checked in a timely manner to ensure that the coupling is aligned and the lubrication system is in place. Check while turning. If the problem still exists, the pump should be disassembled for inspection (refer to the instructions), foreign objects should be cleaned, and the company should be contacted to negotiate a solution. At the same time, check whether the external cooling system has added cooling water (cooling water can be omitted when the temperature of the conventional medium is below 60 ℃).

ZJE-II specialized pump is a single shell double stage heavy-duty bracket filter press feeding slurry pump. In recent years, it has been referred to as the "specialized feed pump for filter presses" by industry insiders. The pump sucks in slurry from the rear side and has a simple packing seal without leakage. More importantly, its flow and head curves are very steep, which is very suitable for the special working condition of feeding filter press. The feed pump of the filter press adopts a unique hydraulic design and impeller installation method, ensuring that its performance curve is steeper than that of general impurity pumps. It is very suitable for achieving high flow, low-pressure feeding and low flow, high-pressure filtration with changes in resistance during the feeding of the filter press. Its special hydraulic performance perfectly matches the gradual process of the filter press from cavity to filling and then to drying. During the initial feeding stage, there is no need to control the motor overload caused by excessive flow rate without valves. At the same time, low pressure will not have an impact on the filter plate frame, reducing the damage of the filter cloth on the filter plate frame and not causing vibration to the filter plate. The small flow rate and high pressure in the later stage of pressure filtration are less likely to cause pump blockage. Especially during the later pressing period, the unique impeller installation method and the role of the secondary impeller of the pump under high pressure ensure that there is basically no leakage at the shaft seal. Without using shaft seal water, it is possible to achieve zero leakage on site and meet the environmental requirements of the factory. This pump is a pressure inlet suction pump with a small suction stroke. It is recommended that the feed liquid level be higher than the center of the pump. The diameter of the inlet and outlet pipelines is generally the same as or slightly larger than the inlet and outlet diameters of the pump, so the liquid concentration is mostly high. Therefore, the inlet pipeline of the pump should not be too long to avoid affecting the suction.

characteristic

1. Hydraulic design and structural design are innovative, efficient, wear-resistant, and operate smoothly and reliably;

2. The initial feeding volume is large and the pressure is low;

3. The later pressing flow is small and the pressure is high;

4. The shaft seal is simple and reliable, without water injection or mechanical sealing, and has no leakage;

5. Filter feeding does not require variable frequency speed regulation, resulting in high conveying concentration.

ZJE-II specialized pump is a slurry pump with special performance, which is very suitable for the special working condition of feeding filter press. The specific working process is as follows:

1. Feeding stage: At the beginning of feeding, the filter chamber of the filter press is empty and needs to be quickly filled with material. The ZJE type filter press feeding dedicated pump initially uses high flow feeding to ensure that the feed quickly fills the filter press.

2. Pressure boosting filtration stage: When the pressure inside the filter press is filled with material and the pressure starts to rise, the filter press quickly discharges water. At this time, the filter press still needs a large flow of feed. During the low-pressure period of the ZJE type filter press dedicated pump, it can still ensure fast and efficient filtration of high flow feed. As the feed pressure gradually increases, the filter cake inside the high-pressure filter begins to thicken, and the water output of the filter press begins to decrease. The filtering capacity of the filter press also decreases, and the feed rate decreases accordingly.

3. Pressure holding filtration stage: The filtration pressure of the filter press rises to the set high pressure, and the feed pressure needs to be maintained at a constant pressure for filtration. The filtration capacity of the filter press further decreases until the filtration is completed. At this point, the flow rate of the ZJE filter press dedicated pump decreased to * * * and began to maintain constant pressure feeding.

In summary, the working state and characteristics of the ZJE filter press feeding dedicated pump are as follows: when the filter press pump starts working to feed the filter press and during low-pressure filtration, it maintains a high flow rate for feeding. As the filter press chamber is filled with material, the pressure also increases, and the filtering capacity of the filter press begins to decrease. When the set pressure value is almost reached, the output flow rate of the ZJE filter press feeding pump decreases until it is filled with material, and then continues to work and maintain a constant pressure to ensure that the moisture in the slurry is quickly squeezed out and the filter press work is completed. The ZJE type filter press feed pump can automatically reduce the feed flow rate of the pump as the filtration capacity of the filter press gradually decreases and the feed pressure gradually increases. The minimum flow rate is 20% of the rated flow rate, and the pump output flow pressure curve is basically consistent with the optimal filtration curve of the filter press. Therefore, it is necessary to choose a dedicated pump for filter press feed.