1 - the definition of water pump
Usually to enhance the liquid, liquid transport or increase the pressure on the liquid, that is, the mechanical energy of the prime mover into liquid energy to achieve the purpose of pumping liquid machine collectively referred to as the pump.
2-pump working principle
1, positive displacement pump: the use of the working chamber volume change of periodic delivery of liquid.
2, vane pump: the use of leaves and liquid interactions to transport liquid.
3-pump specific use
Pump has different uses, different liquid media, different flow, head range, therefore, its structure is of course not the same, the material is also different, in a word, can be roughly divided into:
1. Urban water supply 2. Sewage system 3. Civil engineering and construction system 4. Agricultural water conservancy system 5. Power station system 6. Chemical system 7. Petroleum industry system 8. Mining and metallurgy system 9. Light industry system 10. Ship system
4-type pump classification
(A) According to the working principle of the pump:
1 centrifugal pump 2 vortex pump 3 mixed flow pump 4 axial flow pump 5 electric pump 6 steam pump 7 gear pump 8 screw pump 9 Roots pump 10 vane pump 11 jet pump 12 , Lift pump 13, electromagnetic pump 14, submersible pumps and the like
(B) divided according to use:
1, water pump, 2, slurry pump 3, sewage pump 4, chemical pump 5, pump and so on
(C) other methods of division:
Pump there are many other ways: According to the impeller is divided into single-stage and multi-stage pump; according to the pump suction port is one or two divided into single suction pump and double suction pump and so on.
Hot Melt Adhesive For Express Bag
Express bag sealing with hot melt adhesive, generally used for the sealing of various express bags, some people will feel that the bonding strength is not enough when using, resulting in the opening of the express bag in the middle of the situation. The hot melt adhesive material used to seal the express bag has been fixed. If you want to improve its bonding strength, it can be achieved by the following methods:
1, improve the surface roughness of the sticky object
When the hot melt adhesive is well infiltrated on the surface of the bonded material, the roughness of the surface is conducive to improving the infiltration degree of the hot melt adhesive on the surface, increasing the contact point density between the hot melt adhesive and the bonded material, and thus improving the bonding strength.
2. Penetration
The bonded joint, by the role of the environmental atmosphere, is often penetrated into some other low molecules, for example: the joint in a humid environment, the polymer adhesive layer in the machine solvent, the solvent molecules penetrate into the polymer, the penetration of low molecules first deforms the adhesive layer, and then enters the interface between the adhesive layer and the adhesive, so that the strength of the adhesive layer is reduced, resulting in bonding damage.
3. Migration
Due to the poor compatibility of these small molecules with polymer macromolecules, they are easy to migrate from the polymer surface or interface, and the small molecules that migrate out will hinder the hot melt adhesive and the adhesive material if they gather at the interface.
4. Apply pressure to the bonding surface
When bonding, pressure is applied to the bonding surface, so that the hot melt adhesive is more easily filled with pits on the surface of the bonded body, and even flows into deep holes and capillaries, reducing the gas overflow on the surface of the bonded body and reducing the porosity in the bonding area.
5. Thickness of rubber layer
The thicker adhesive layer is easy to produce bubbles, defects and early fracture, so the adhesive layer should be as thin as possible to obtain higher bonding strength, in addition, the thermal stress caused by the thermal expansion of the thick adhesive layer after heating in the interface area is also relatively large, which is more likely to cause joint damage.
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