Special lecture on mechanical equipment: “Pumps” – Learn a little every day (15): Pneumatic diaphragm pumps „Improve yourself\"”

Thread Content

This post was last edited by A Dai A Mu on 2013-12-12 at 12:30. In order to encourage more people to come and discuss as well as to study more actively, the top five users each time will receive a “Motivational Reward for Active Learning”. Some people might think that it’s terrifying to spend one’s working days doing nothing, performing menial tasks, not knowing what to do or what to learn, day after day, year after year, with no vision for one’s future! We must start working hard from now on; even if we learn a little knowledge every day, it will add up over time and help us enrich ourselves. We need to set clear goals – only by filling our minds first can we enrich other aspects of our lives as well. . . . . . It only takes a short ten-odd minutes per day, and you will see the future! ! ! (Anyway, I have learned it; whether you learn it or not is up to you. Besides those experts like Hai Chuan, there are still others who know it.) . . ) Enough talk – let’s start with the basics today~~! I’ve been posting special threads for so many days now; I’m sure everyone has benefited a lot from them. Thank you all for your support~~! Welcome everyone to listen. I have started broadcasting, and I hope those who, like me, want to gain knowledge every day will listen. Let’s learn together every day and discuss~~! These past few days, many people have asked questions, and I’ll do my best to answer them all. There might be some I haven’t encountered before, but there are still plenty of people in our community who can help answer them. @AidaiAmu @hcwang12345 @YiHuXiangMing @tjdxz @YouDianDai @NewbiesInHaiChuan @lovestory @ManTianYun @zhaoqingsheng Yesterday, a mixed-flow pump was installed; I believe those interested in pumps now have a better understanding of axial flow pumps!! From now on, I’ll try to break down the knowledge into smaller portions, in manageable amounts, to make it easier for everyone to learn*~~! Someone has asked me about pneumatic diaphragm pumps these past two days! Today, I’ll explain pneumatic diaphragm pumps to you all~~~! It might not cover everything; if you have any questions, please ask on the floor. Thank you~~! Pneumatic diaphragm pump. Materials available for pneumatic diaphragm pumps: cast iron, stainless steel, engineering plastics, aluminum alloy, fluorinated lining. 1. Overview: The pneumatic diaphragm pump is a new type of conveying machinery and represents one of the most innovative pump designs available in China at present. Powered by compressed air, it can pump out and remove various corrosive liquids, liquids containing particles, as well as liquids that are highly viscous, volatile, flammable, or highly toxic. Pneumatic diaphragm pumps are available in four materials: plastic, aluminum alloy, cast iron, and stainless steel. Diaphragm pumps use nitrile rubber, neoprene, fluororubber, polytetrafluoroethylene, and polyhexafluoroethylene depending on the different liquid media. To meet the needs of different users. Installed in various special applications to pump fluids that conventional pumps cannot handle, it has achieved satisfactory results. II. Applicable scenarios: Due to the above characteristics of pneumatic diaphragm pumps, since their invention, they have gradually made their way into the market of other types of pumps around the world, occupying a share of that market. For example, diaphragm pumps hold a dominant position in industries such as painting and ceramics; in other industries like environmental protection, wastewater treatment, construction, sewage disposal, and fine chemicals, they are expanding their market share and occupy a position that cannot be replaced by other types of pumps. The advantages of pneumatic diaphragm pumps are as follows: 1. Since air is used as the driving force, the flow rate automatically adjusts in response to changes in back pressure (exit resistance), making them suitable for fluids with medium to high viscosity. The operating point of a centrifugal pump is set based on water as a reference; if it is used with fluids that have a higher viscosity, then a reducer or variable frequency drive is required, which increases the cost. The same applies to gear pumps as well. 2. Pneumatic pumps are reliable and cost-effective for use in flammable and explosive environments, such as in fuel transfer, because: first, sparks cannot be generated once grounding is in place ； Second, no heat is generated during operation, so the machine will not overheat ； Third, the fluid does not overheat because diaphragm pumps cause minimal agitation of the fluid. 3. In harsh working environments such as construction sites, where industrial and mining wastewater is discharged, the high amount of impurities and complex composition of this wastewater can easily cause blockages in the pipelines. This results in excessive strain on electric pumps, leading to overheating and premature damage of the motors. Pneumatic diaphragm pumps can pass through particles and have adjustable flow rates; they automatically stop when the pipeline is blocked until it becomes unobstructed. 4. Additionally, diaphragm pumps are compact and easy to move; they do not require a foundation, take up very little space, and are simple and cost-effective to install. It can be used as a mobile material transfer pump. 5. In the handling of hazardous and corrosive materials, diaphragm pumps can completely isolate the materials from the outside environment. 6. Or, in some tests, it is ensured that the raw materials are free from impurity contamination. 7. It can be used to transport fluids with relatively unstable chemical properties, such as photosensitive materials and flocculants. This is because diaphragm pumps have low shear force, resulting in minimal physical impact on the material. III. Working principle: 1. Powered by compressed air. 2. In the two symmetric working chambers of the pump, there is an elastic diaphragm in each chamber; a connecting rod links these two diaphragms together. When compressed air enters the pump through the intake connector and reaches the valve, it pushes the diaphragms in the two working chambers, causing the diaphragms connected by the connecting rod to move synchronously. Meanwhile, the gas in the other working chamber is discharged outside the pump from behind the diaphragm. Once the destination of the trip is reached. The valve mechanism automatically introduces compressed air into another working chamber, pushing the diaphragm in the opposite direction, thereby enabling synchronous back-and-forth movement of the two diaphragms. Each working chamber is equipped with two check ball valves. The back-and-forth movement of the diaphragm causes a change in the volume within the working chamber, which forces the two check ball valves to open and close alternately, thereby continuously drawing in and discharging liquid. Therefore, diaphragm pumps have the following characteristics: (1) The pump does not overheat: Compressed air is used as the driving force, and the exhaust process is one of expansion and heat absorption; thus, the temperature of the pneumatic pump decreases during operation, and no harmful gases are emitted. (2) No electric sparks are generated: Pneumatic diaphragm pumps do not rely on electricity for operation, and grounding prevents the occurrence of static sparks. (3) They can handle liquids containing particles: Due to their positive displacement mechanism and ball valves at the inlet, they are less likely to get clogged. (4) The shear force on the material is extremely low: it draws in and discharges the material as it operates, resulting in minimal disturbance to the material; this makes it suitable for transporting unstable substances. (5) The flow rate can be adjusted by installing a throttle valve at the material outlet. (6) It has a self-priming function. (7) It can run without load without any danger. (8) Can work underwater. (9) It can transport a very wide range of fluids, from those with low viscosity to those with high viscosity, and from corrosive ones to viscous ones. (10) There is no complex control system, no cables, fuses, etc. (11) Small in size and light in weight, making it easy to move. (12) No lubrication is required, so maintenance is simple, and it does not contaminate the working environment due to leaks. (13) The pump always maintains high efficiency and does not see a decrease due to wear. (14) 100% energy utilization: when the outlet is closed, the pump stops automatically, preventing issues such as equipment movement, wear and tear, overload, and overheating. (15) There are no moving seals, which simplifies maintenance and avoids leaks. There is no dead point during operation. IV. Uses of the pump: 1. The pump is used to transfer peanut butter, pickles, mashed potatoes, sausages, jam, apple sauce, chocolate, etc. 2. Pump in paint, resin, pigments. 3. Adhesives and glues of all types can be pumped up. 4. Various glazes for tiles, porcelain, bricks, and pottery. 5. After the oil well is drilled, use a pump to remove sediments and inject grout. 6. Pumps various emulsions and fillers. 7. Pumps various types of sewage. 8. Use a pump to empty and remove the wastewater from the tanks of oil tankers and barges. 9. Hop and yeast slurry, syrups, molasses. 10. Pump out water from mines, shafts, tunnels, ore processing facilities, and slag piles. Pump-driven cement grouting and mortar. 11. Various rubber pastes. 12. Various abrasives, corrosives, oils and muds, cleaning agents for grease, and general containers. 13. Various highly toxic, flammable, and volatile liquids. 14. Various strong acids, strong bases, and highly corrosive liquids. 15. Various liquids can withstand up to 100°C. 16. As a pressure supply device used as a precursor to various solid-liquid separation equipment. V. Advantages of diaphragm pumps: no leakage, self-priming capability, can operate without load, and do not require electricity, making them safer. VI. Performance Parameters Table: Model, Flow Rate (m3/h), Head (m), Outlet Pressure (kgf/cm2), Suction Lift (m), Maximum Allowable Particle Diameter (mm), Maximum Air Supply Pressure (kgf/cm2), Maximum Air Consumption Rate (m3/min). Material: Aluminum alloy, Stainless steel, Cast iron, Reinforced polypropylene. QBY-100: 0.80–50; 65170.3; ★★★★. QBY-150: 10–50; 65170.3; ★★★★. QBY-250: 2.40–50; 672.57; 0.6; ★★★★. QBY-400: 80–50; 674.57; 0.6; ★★★★. QBY-500: 120–50; 67870.9; ★★★/. QBY-650: 160–50; 67870.9; ★★★/. QBY-800: 240–50; 671071.5; ★★★/. QBY-1000: 300–50; 671071.5; ★★★/. VII. Actual Photos: VIII. Structure Diagram of Diaphragm Pump: IX. Features and Advantages of Pneumatic Diaphragm Pumps: X. Installation Diagram: After watching this presentation, do you now have a better understanding of pneumatic diaphragm pumps? Let’s keep learning a little bit every day to enrich ourselves; little by little, we can achieve great things~~~! Below are my special series of lectures on mechanical equipment – “Pumps”. Learn something new every day: (16) Pneumatic diaphragm pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1257985-1-1.html. Learn something new every day: (15) Pneumatic diaphragm pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1257433-1-1.html. Learn something new every day: (14) Mixed-flow pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1257224-1-1.html. Learn something new every day: (13) Axial flow pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1256970-1-1.html. Learn something new every day: (12) Jet vacuum pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1256707-1-1.html. Learn something new every day: (11) Automotive pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1256253-1-1.html. Learn something new every day: (10) Pump materials – “Improve your knowledge” http://bbs.hcbbs.com/thread-1255790-1-1.html. Learn something new every day: (9) Self-priming pumps and pump materials – “Improve your knowledge” http://bbs.hcbbs.com/thread-1255635-1-1.html. Learn something new every day: (8) Oil seals – “Improve your knowledge” http://bbs.hcbbs.com/thread-1255340-1-1.html. Learn something new every day: (7) Seals – “Improve your knowledge” http://bbs.hcbbs.com/thread-1255132-1-1.html. Learn something new every day: (6) O-rings – “Improve your knowledge” http://bbs.hcbbs.com/thread-1254912-1-1.html. Learn something new every day: (5) Pump structure – “Improve your knowledge” http://bbs.hcbbs.com/thread-1254630-1-1.html. Learn something new every day: (4) Pump structure – “Improve your knowledge” http://bbs.hcbbs.com/thread-1254625-1-1.html. Learn something new every day: (3) “Improve your knowledge” http://bbs.hcbbs.com/thread-1253809-1-1.html. Learn something new every day: (2) Schematic diagram of centrifugal pumps – “Improve your knowledge” http://bbs.hcbbs.com/thread-1253590-1-1.html. Learn something new every day: (1) Pump selection – “Improve your knowledge”. These are my special posts; I will continue to update them daily. Please give me your support, listen, and discuss! ； If there’s any direction that needs to be explained, feel free to contact me. If many people ask for it, I’ll create a dedicated post to cover it~~! Welcome everyone to listen. I have started broadcasting, and I hope those who, like me, want to gain knowledge every day will listen. Let’s learn together every day and discuss~~!