Diaphragm pump is a new type of conveying machinery with excellent performance and wide application, which plays a vital role in modern industrial production and engineering field.Working Principle The working principle of diaphragm pump is unique and efficient. Through mechanical, pneumatic or hydraulic means, the diaphragm is driven to reciprocate, thus changing the volume of the pump chamber and realising the suction and discharge of liquid. In the suction stroke, the diaphragm backward movement, at this time the volume of the pump chamber increases rapidly, the formation of internal negative pressure. Under the strong effect of atmospheric pressure, the liquid is smoothly sucked into the pump chamber. In the discharge stroke, the diaphragm forward movement, the volume of the pump cavity decreases sharply, the liquid is squeezed, the pressure rises suddenly, and finally be discharged from the pump cavity.
The type of diaphragm pump
This type of diaphragm pump uses compressed air as the power source. Through a well-designed valve system, the air in and out of the precise control, so as to promote the movement of the diaphragm. It has many significant advantages, such as excellent explosion-proof performance, so that it can work safely and stably in flammable and explosive hazardous environments; strong adaptability to harsh conditions, so that it can operate reliably at high temperatures, high humidity, dusty and other extreme conditions.
Powered by the electric motor, through the complex and precise mechanical transmission device, the rotary motion of the motor is transformed into the reciprocating motion of the diaphragm. It is easy to operate, easy to realise automatic control, and can meet various precise flow and pressure control requirements.
Using high-pressure hydraulic oil as the power medium to push the diaphragm for efficient movement. The output pressure of this type of diaphragm pump is usually high, the flow rate is stable and accurate, especially suitable for industrial applications with very high pressure and flow requirements.
The structure of the diaphragm pump
Diaphragm pumps are mainly composed of key parts such as driving part, transmission part, pump head part and inlet and outlet pipes.
It is the power source of the whole pump, such as the air source device of pneumatic diaphragm pump, including air compressor, air storage tank and related air pressure regulator; electric diaphragm pump motor, AC motor and DC motor, with different performances and characteristics to meet different working requirements.
It bears the important task of accurately and efficiently transferring the power of the driving part to the diaphragm. The common transmission mechanism includes the linkage mechanism, which drives the diaphragm through the reciprocating motion of the linkage, and the gear mechanism, which realises the precise motion transmission through the gears that mesh with each other.
This is to achieve the core components of the liquid suction and discharge, including the pump body, diaphragm, valve ball, valve seat and so on. The pump body is usually made of high-strength, corrosion-resistant materials to ensure long-term stable operation. The diaphragm is the key isolation and actuation element, which needs to have good flexibility and corrosion resistance. Valve balls and seats are responsible for controlling the flow direction of the liquid to ensure the accuracy of the suction and discharge process.
Used to connect the pump with the external piping system, so that the liquid can flow smoothly in and out of the pump body. The material and diameter of the inlet and outlet pipe should be carefully designed according to the nature of the transported liquid, flow rate and pressure requirements.
Features of diaphragm pump
The clever design of the diaphragm completely isolates the conveyed liquid from the driving part, thus effectively achieving zero leakage. This feature makes it has incomparable advantages when dealing with toxic, harmful, flammable, explosive and other dangerous media, which greatly guarantees the safety of the production process and the protection of the environment.
In order to cope with a variety of corrosive liquid conveying needs, the pump body and diaphragm can be selected from a variety of corrosion-resistant materials such as stainless steel, plastic (such as PTFE), rubber (such as Viton) and other materials for manufacturing. These materials have been carefully selected and specially treated to enable long-term stable operation in harsh chemical environments, ensuring the service life and performance reliability of the pump.
Diaphragm pump has strong self-priming ability and can be started quickly without tedious pump filling operation. It can independently suck up the liquid in a short time, which greatly improves the working efficiency and reduces the operation steps and manpower input.
With its unique working principle and structural design, the diaphragm pump can easily meet the challenge of transporting high-viscosity liquids, such as glue, paint, syrup and so on. During the conveying process, the flow rate and pressure can be maintained at a stable level to ensure the smooth transmission of liquids.
The flow rate of the pump can be easily and precisely adjusted by flexibly changing the working frequency of the driving part, the stroke length or adopting technical means such as frequency conversion speed control. This feature enables it to adapt to the flow rate changes under different process requirements, realising highly efficient and energy-saving production and operation.
The relatively simple structure design makes the diaphragm pump have a relatively small number of parts. This not only reduces the cost of manufacturing and assembly, but also brings great convenience for daily maintenance and repair work. In the event of failure, maintenance personnel can quickly locate and replace the faulty parts, shorten the downtime and improve the equipment utilisation.
Application fields of diaphragm pump
1.Chemical industry
In chemical production, diaphragm pumps are widely used to transport various chemical raw materials, finished products and intermediate products. Whether it is strong acid, strong alkali, salt solution, or various organic solvents, diaphragm pumps can stably and reliably complete the transport task. Its corrosion-resistant and non-leakage characteristics effectively guarantee the safety of chemical production and environmental protection requirements.
In the process of sewage treatment, diaphragm pumps can transport sludge containing a large number of solid particles and impurities; in waste gas treatment, it can accurately transport chemicals to ensure the effect of waste gas purification. Its application in the field of environmental protection plays an important role in improving environmental quality and protecting ecological balance.
Strict food hygiene standards require that conveying equipment must be non-polluting and easy to clean. Diaphragm pumps can meet these requirements, and are used to transport food raw materials (such as milk, fruit juice), finished products (such as beverages, sauces) and various food additives. Its material safety, no leakage characteristics, to protect the quality and safety of food.
In pharmaceutical production, diaphragm pumps are commonly used to transport medicinal liquids, intermediates and biochemical products. Its clean and sterile design concept meets the strict requirements of the pharmaceutical industry for the production environment, ensuring the quality and safety of drugs.
The conveying of electronic chemicals requires high purity and precision. Diaphragm pumps can accurately transport photoresists, cleaning agents and other high-purity electronic chemicals, providing strong support for precision manufacturing in the electronics industry.
In mining operations, diaphragm pumps can be used to transport materials containing a large number of solid particles, such as slurry, tailings and mud. Its strong conveying capacity and wear-resistant performance can adapt to the harsh mining environment and improve mining efficiency.
Diaphragm pump selection points
Accurately assess the actual process flow and discharge pressure required, which is the primary basis for selection. The size of the flow directly affects the production efficiency, while the pressure determines whether the liquid can be transported to the specified location. 2.
Full consideration of the chemical properties of the medium (such as corrosion, acidity and alkalinity), physical properties (such as viscosity, temperature, solid content) and other factors. Different media characteristics require the selection of the corresponding pump body and diaphragm materials to ensure the long-term stable operation and service life of the pump.
According to the space layout of the site and process requirements, select the appropriate installation method, such as vertical, horizontal, fixed or mobile. Reasonable installation not only saves space, but also facilitates operation and maintenance.
Combined with the automation requirements of the production process, choose manual control, automatic control or remote control. Advanced control methods can achieve accurate flow and pressure regulation, improve the stability and reliability of the production process.
Among the many brands in the market, choose a well-known brand with good reputation and rich experience. Quality products usually have higher quality assurance, better after-sales service and technical support, which can bring long-term value and peace of mind for users.
Maintenance and care of diaphragm pump
Diaphragm, as the core component of diaphragm pump, the degree of wear directly affects the performance and service life of the pump. Therefore, it needs to be inspected regularly, and should be replaced in time once signs of damage or aging are found.
Regularly clean the debris and dirt inside the pump body to avoid it entering the pump chamber and affecting the normal operation of the pump. At the same time, pay attention to prevent external impurities from entering the pump body, you can use a suitable filtering device for protection.
Sealing is the key to ensure that the diaphragm pump operates without leakage. Regularly check the gaskets, seals and other parts at each connection, and replace or repair them in time if there is any leakage.
Lubricant and hydraulic oil play an important role in lubrication and cooling for the normal operation of the pump. The oil should be replaced regularly with oil of suitable specifications in strict accordance with the requirements of the equipment manual to ensure that the mechanical parts of the pump can operate well.
For pneumatic diaphragm pumps, it is necessary to check the working status of the air source device to ensure stable air pressure; for electric diaphragm pumps, it is necessary to check the insulation of the electric motor, bearing lubrication, etc.; for hydraulic diaphragm pumps, it is necessary to check the pressure of the hydraulic system, the temperature of the oil, and other parameters, to ensure that the hydraulic system operates normally.
In short, diaphragm pumps, as a highly efficient, reliable, leak-free conveying equipment, with its unique working principle and excellent performance characteristics, has been widely used in many industrial fields. With the continuous progress of science and technology and the growing industrial demand, the diaphragm pump technology will continue to innovate and improve, its performance will be further enhanced, the scope of application will continue to expand, in order to promote the development of various industries to play a more important role.
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