Powder conveying pumps are used to transport solid powder materials, and there are significant differences between them and diaphragm pumps used for liquid conveying. Solid powder like materials can only be kept in a semi flowing state to prevent them from being compressed into approximately solid blocks in the pump chamber, which may cause transportation failure and damage to the pump. Therefore, ordinary double diaphragm pumps used for transporting liquids cannot be used for solid dry powder transportation normally. So the powder pump system needs to add a special set of valves. In each pump cycle, compressed air (or other inert gas) is synchronously introduced into the pump chamber according to a certain time sequence, so as to maintain the flow state during the powder pumping process.

This type of pump is commonly used in the field of lightweight, dry, and small batch transportation of fine powders. Installation is extremely convenient, with a small size and no space occupation. The discharge port of the pump can be connected to the inlet of the storage tank with a hose (or a hard pipe). After the powder enters the storage tank in a positive pressure state, there will be a downward impact force, and the majority of the powder will move downwards. Therefore, there is less dust at the top of the tank, but a dust removal bag or air filter is also needed to release the pressure inside the tank.
The powder conveying pump product adopts energy-saving gas path induction distribution valve technology, which separates the motor gas supply of the pump from the powder fluidization gas path. This product can set the pressure of the fluidized gas (2.5-6.2 bar) according to the difference in flowability of the powder. Powder with low bulk density and easy flowability can be set to a lower fluidized gas pressure, which can achieve the goal of energy saving and also reduce the load on the air release component. The pneumatic motor air supply pressure (2.0-3.5 bar) that can be set according to the conveying volume and height, combined with the powder feeding station (lower suction mode) or suction gun (upper suction mode), dust collector and pipeline blowing system, can achieve dust-free operation of the system, with very little residue in the pipeline and pump body.
The powder pump is an improved version of the pneumatic double diaphragm pump, with the addition of an air path induction distribution system that uses a small amount of airflow as a carrier. Based on the working principle of the diaphragm pump, the pump produces a volume change during operation, and the pump self suction generates a certain negative pressure, about 40Kpa. This negative pressure value can easily suck some lightweight powders into the pump. When the pump sucks in the powder and the diaphragm moves to one side to push out the conveying medium upwards, a certain pressure of compressed air (or other gas) is filled into the fluid chamber through the gas distribution valve, allowing the powder to fully contact with the gas and form a suspended solid gas mixture. The powder is then sent to the storage tank or other equipment along the output pipeline in a slightly positive pressure state.
This type of pump is commonly used in the field of lightweight, dry, and small batch transportation of fine powders. Installation is extremely convenient, with a small size and no space occupation. The discharge port of the pump can be connected to the inlet of the storage tank with a hose (or a hard pipe). After the powder enters the storage tank in a positive pressure state, there will be a downward impact force, and the majority of the powder will move downwards. Therefore, there is less dust at the top of the tank, but a dust removal bag or air filter is also needed to release the pressure inside the tank.
There is a significant difference between this conveying method and the vacuum suction method. The vacuum conveyor forcibly passes the dust through the filter element to achieve gas-solid separation, which often leads to some relatively fine (less than 1-2 microns or even nanometer sized powder) dust being concentrated and adhered to the filter medium, resulting in unsatisfactory blowback effect. And micro positive pressure filter cartridges are generally not easy to clog, which is the conclusion we have drawn through many tests. According to the inlet and outlet pipe diameters of the pump, it can be divided into 2-inch (DN50) and 3-inch (DN80).
working principle
The main components shown in the reference diagram are the distribution valve C, which is a dual pilot valve that controls the distribution of fluidized gas flow. It is the slave valve of the pump main valve. The main air control valve B is connected to the pump main valve outlet D. Based on the pressure at these two ports, it can be identified that the pump main valve is pressurizing the left and right air chambers, thereby controlling the powder fluidization airflow to be introduced into the powder chamber on the discharge side, so that the powder in this chamber is in a fluidized state and discharged like a liquid. The compressed gas entering the powder chamber is filtered through pressure reducing regulating valve A, and under normal operating conditions, it mainly relies on the operating status of this pressure regulating pump. When compressed gas is loaded into the filtering and stabilizing regulating valve A, the fluidized gas distribution valve C introduces the initial fluidized gas flow into the powder chamber. And give a start signal to the main pneumatic control valve B, and the diaphragm pump will start working.
When the diaphragm of the pump reaches the end of the discharge stroke, the diaphragm movement reverses direction, and the gas distribution valve C changes direction, closing the fluidized gas flow in * powder chambers and opening the fluidized gas flow to another powder chamber. The compressed gas burst towards the powder, making it in a flowable fluid state in the powder chamber. The nozzle E is installed at the inlet of the fluidized gas flow circuit to increase the velocity of the compressed gas injected.
Tip: Use other gases: The cost of using other compressed gases to drive 2 'or 3' pumps is higher because the gas consumption of driving the pump is relatively high. It can be used separately, with compressed air used to drive the pump and other gases that meet the requirements, such as nitrogen, argon, etc., for fluidized gas. Of course, ordinary compressed air can also be used. For some flammable and explosive powders, anti-static wires need to be connected and grounded to eliminate static electricity generated during pump operation.
feature
1. Transporting powdered materials in a closed management system can prevent workers from coming into contact with the powder as little as possible, especially for some toxic and harmful powders, ensuring personal safety;
2. Avoiding the situation of dust flying around the production workshop, reducing air pollution and raw material waste;
3. Design an airflow induction system;
4. The fluidized gas and the motor-driven gas of the pump can be separated to avoid oxidation and deliquescence caused by material air contact; Fluidized gas can be further purified and dried separately (in contact with powder), and other gases such as nitrogen and other inert gases can be used
5. System economy, simple and ready to use - unlike expensive traditional large and complex pre installed powder conveying systems;
6. Lightweight and easy to move and use anywhere (can be installed on a small cart, which can be customized). Ready to use, no installation or debugging required;
7. There are 2 'and 3' diameters, and the pump body materials include cast iron, aluminum alloy, plastic, and stainless steel.
main purpose
It can successfully transport powder with a bulk density of 80-980kg/m3, which is dry and less than or equal to 150 mesh, lightweight, dry, and easy to flow. Can be effectively used for the transportation of various dry powders: white carbon black, powdered activated carbon, sodium calcium carbonate, basic zinc carbonate, activated clay, resin powder, various pigments, plasticizers in the plastic industry, flame retardants, acrylic resins, silicone resins and other organic powders; Fine chemical, pharmaceutical raw materials and intermediate production industries, as well as other lightweight powder transportation.
Adopting a sealed conveying mode, the powder is directly transported from the container to your formula, reducing dust pollution in the working environment; The non dead point air valve integrated with * technology, combined with a brand new automatic airflow distribution induced fluidization system, has reliable performance, low failure rate, and can effectively prevent sudden powder spraying at the moment of startup; Eliminating the blockage caused by compaction and agglomeration in the traditional conveying process, greatly improving the conveying efficiency; Fluidized gas and transport gas can be separated to avoid oxidation and moisture of materials in contact with air; Can be easily moved and used anywhere, ready to use, easy to install and debug; Replacing manual powder transportation reduces the labor intensity of workers; The largest siphon has a height of 4m.
Main precautions
The conveying distance is related to particle size and packing density (45 meters for silica and 12 meters for flour); The higher the density, the smaller the conveying distance and flow rate.
Structural schematic

Installation, use and maintenance
install
The entire pumping system must be reliably grounded to prevent the risk of explosion caused by static electricity for flammable and explosive powders. Poor grounding, including pumps, pipelines, valves, and other accessories on various pipelines, may pose a risk of explosion and result in significant personal and property damage if not properly grounded as required.
Grounding of the system
1. According to local regulations and relevant safety and explosion prevention requirements of the factory and industry, properly grounded.
2. Strict compliance with national and industry safety and explosion prevention requirements is required during use. Please refer to relevant documents and regulations.
3. Ground the pump belt through the grounding bolt and conductive tape, and shorten the length of the conductive tape as much as possible.
4. It is the joint responsibility of the installation personnel and the operator to ensure that the pump operates under safe conditions.
5. Ensure that the pump is firmly installed on the base to prevent vibration from causing metal impact, sparking, and damaging the pump.