The external meshing pump with rubber gears is a kind of pump that realizes the transportation of liquids by the meshing and separation of rubber gears. The following will introduce it in terms of its structural principle, characteristics, applications, etc.:
Structural and Working Principle
Basic Structure: It is mainly composed of components such as the driving rubber gear, driven rubber gear, pump body, pump cover, bearings, and shaft seals. Among them, the pump body and pump cover form a sealed space. The rubber gears are installed inside the pump body, and the gear shafts are supported on the pump cover through bearings. The driving gear shaft extends out of the pump body and is connected to the driving device.
Working Principle: When the driving rubber gear rotates driven by the driving device, it will drive the driven rubber gear to rotate in the opposite direction. On the suction chamber side, as the gears disengage, the space between the teeth gradually increases, creating a local vacuum. Under the action of atmospheric pressure or system pressure, the liquid is sucked into the pump. On the discharge chamber side, as the gears mesh, the space between the teeth gradually decreases, and the liquid is squeezed out of the pump, thus realizing the transportation of the liquid.
Characteristics
Advantages
Good Sealing Performance: Rubber materials have elasticity, and a good seal can be formed between the gears and the pump body, as well as between the gears. This can effectively reduce liquid leakage, improve the volumetric efficiency of the pump, and help maintain stable flow rate and pressure.
Wear Resistance and Self-compensation: Rubber gears are relatively soft and have a certain tolerance for a small amount of impurity particles in the conveyed medium. They are not likely to experience a rapid decline in performance due to wear. At the same time, the elasticity of rubber can compensate for the wear of the gears to a certain extent, extending the service life of the pump.
Vibration and Noise Reduction: Rubber itself has good shock absorption performance. During the operation of the pump, it can effectively reduce the transmission of vibration and noise, making the operation of the pump more stable and quiet, and reducing the noise pollution in the working environment.
Good Corrosion Resistance: Appropriate rubber materials can be selected according to different conveyed media, such as nitrile rubber, fluororubber, etc. These rubber materials have good resistance to many corrosive media and can work stably in corrosive environments such as the chemical industry and electroplating.
Strong Adaptability to Media: It is suitable for transporting liquids of various viscosities, including high-viscosity gelatinous materials, oily substances, and suspensions containing tiny particles or fibers, etc., and has a wide application range.
Disadvantages
Temperature Limitation: The applicable temperature range of rubber materials is limited, and it generally cannot be used to transport high-temperature media. The operating temperature of ordinary rubber gears is usually between -20°C and 80°C. The temperature range that special rubber materials can withstand may be expanded to some extent, but it is still relatively limited.
Pressure Limitation: Due to the relatively low strength and stiffness of rubber, the working pressure that the external meshing pump with rubber gears can withstand is generally lower than that of metal gear pumps. It is usually suitable for medium and low-pressure working conditions. Higher pressure may lead to gear deformation, damage, or seal failure.
Speed Limitation: In order to avoid problems such as excessive centrifugal force, wear, and heat generation caused by the high-speed rotation of rubber gears, the rotational speed of the external meshing pump with rubber gears generally cannot be too high, which limits the flow rate and transportation capacity of the pump to a certain extent.
Limited Service Life: Although rubber gears have a certain wear resistance, after long-term use, rubber will still experience phenomena such as aging and cracking, resulting in a decline in gear performance. It is necessary to replace the gears regularly or carry out maintenance.
Application Fields
Food and Beverage Industry: It can be used to transport various food raw materials and finished products such as syrup, honey, jam, fruit juice, milk, yogurt, etc. Its good sealing performance and hygienic properties can ensure the quality and safety of food and avoid contamination.
Chemical Industry: It is suitable for transporting various chemical raw materials and solutions with low corrosiveness and low viscosity, such as dilute acids, dilute alkalis, salt solutions, organic solvents, coatings, inks, etc., and can meet the fluid transportation requirements in the chemical production process.
Pharmaceutical Industry: In pharmaceutical production, it can be used to transport liquid medicines, ointments, biological preparations, etc. Its low noise, stable transportation, and hygienic requirements meet the strict standards of the pharmaceutical industry, helping to ensure the quality of drugs and the cleanliness of the production environment.
Daily Chemical Industry: It is often used in the production process of daily chemical products such as cosmetics, detergents, toothpaste, shampoo, etc., to transport various pasty, creamy, and viscous materials, and to realize process steps such as material mixing, preparation, and filling.
Rubber and Plastics Industry: In the rubber processing process, it can be used in processes such as rubber molding extrusion, rubber compound supply, and filtration; in plastic processing, it can be used for the transportation, metering, and pressurization of plastic melts, which helps to improve production efficiency and product quality.
