Pump out of the role of the chamber and classification

The function of the pressure chamber is to introduce the liquid into the impeller of the next stage or to the outlet pipe with the least loss and at the same time convert some of the kinetic energy into pressure energy. Pressure chamber a lot of types, common are: First, the spiral volute it only acts as a collection of liquid. At this time the liquid flows out from the impeller evenly, and the liquid in the volute is moved at a constant speed. The kinetic energy is changed into the pressure energy in the diffuser. In the spiral volute, the gap between the pump tongue and the impeller should be appropriate, too small and easy to produce vibration, and increased noise near the point of death. The liquid enters the diffusion tube after coming out of the volute, and the diffusion angle of the diffusion tube is generally 6º ~ 10º. Second, the radial guide vane it fixed at the exit of the impeller. The role of guide vanes and the volute, the front section only to collect the role of liquid, liquid in this section for constant speed movement, only to the diffusion part of the kinetic energy into pressure, it can be regarded as guide vane placed around the impeller Several volutes. In addition to the radial guide vanes, there are flow guide vanes, their role is the same, but different structures. The runner vane is monolithic in that liquid flows through the vane runner from the vane inlet to the suction vane outlet. But it is complicated to manufacture and generally not used. Third, the ring-pressure chamber used in the multi-stage pump out of the water section, the pressure chamber of the cross-sectional area equal to the flow velocity is not the same throughout the impeller out of the liquid will inevitably occur with the liquid pressure out of the room Impact, so its less efficient. Pumps with a volute pressure chamber and a guide vane pressure chamber are compared as follows: 1. The hydrostatic head generated by the volute pump is large, with little loss, high efficiency and simple structure. The axial thrust can be balanced by symmetrical arrangement of impellers. The guide vane pump is poor, and has a special balance device. 2, volute pump The entire rotor can be assembled in advance, on the pump body. The guide vane pump disassembly are very troublesome. 3, Volute pump impeller diameter can be reduced by 20% turning on the curve and the efficiency of little effect, but the vane pump can not, otherwise it will cause great energy loss. 4, when the flow deviates from the design conditions, the movement of the vane pump changes, the efficiency dropped rapidly, while the volute pump is not the case, its efficiency is not significantly reduced within a relatively wide range. 5, volute pump compared with the guide vane pump, the disadvantage is the casting complex, axial length, the need for larger processing machinery, and will produce radial force, the structural measures must be used to balance.

Steel Fasteners

Fasteners, also known as standard parts in the market, is two or more parts (or components) of the fastening connection as a whole used by a class of mechanical parts. It is characterized by a wide variety of specifications, different performance uses, and standardization, serialization, universality of the degree is extremely high. The fastener is the most widely used mechanical foundation piece, the demand is very big.

It usually includes the following 12 parts bolt from the head and screw with external thread cylinder two parts of a class of fasteners with Nuts to tighten the connection of two parts with through holes. This form of connection is called bolted connection. If the NUT is unscrewed from the bolt, the two parts can be separated so that the bolt connection is a removable connection. A type of fastener having no head and only two ends that are externally threaded. One end must be screwed into a part with an internal threaded hole, and the other end must be threaded through the part with a through hole, and the nut must be screwed on even though the two parts are firmly connected as a unit. This type of connection is also known as a stud connection and is a detachable connection. The utility model is mainly used for the occasion where the thickness of one of the connected parts is relatively large, the compact structure is required, or the bolt connection is not suitable because of frequent disassembly. Screw is also composed of the head and screw two parts of a class of fasteners according to use can be divided into three categories of Machine Screws, set Screws and special purpose screws. Machine screws are mainly used for the fastening connection between a part with a fastening thread hole and a part with a through hole. The fastening connection does not need a nut to match. This type of connection is called a screw connection and is also a removable connection. The fastening screw is mainly used for fixing the relative position between two parts. Special purpose screws such as ring screws are used for lifting parts. Nuts with internal thread holes are generally flat hexagonal or flat square or flat cylindrical fit Bolts , studs or machine screws used to fasten two parts together as a unit. Special class of nuts high strength self-locking nuts is a classification of self-locking nuts with a strong side of high reliability. Mainly is the introduction of European technology as a prerequisite for road construction machinery, mining machinery, vibration machinery equipment and other domestic production of such products manufacturers are few. NYLON SELF-LOCKING NUT is a new type of high vibration-resistant and anti-loose fastening parts, which can be used in various mechanical and electrical products with temperature-50100 °C. Aerospace, aviation, tanks, mining machinery, automotive transport machinery, agricultural machinery, textile machinery, electrical products and various types of machinery demand for nylon self-locking nuts increased because its anti-vibration and anti-loosening performance is much higher than other anti-loosening devices and vibration life is several times or even dozens of times higher. At present, more than 80% of mechanical equipment accidents are caused by the loosening of fasteners, especially in mining machinery. And the use of Nylon self-locking nuts can eliminate the fastener looseness caused by a major accident. 5. The tapping screw is similar to the machine screw but the thread on the screw is a special tapping screw thread. For fastening and connecting two thin metal members into a whole, small holes need to be made on the members in advance because the screws have high hardness and can be directly screwed into the holes of the members to form a responsive internal thread. The connection form also belongs to the detachable connection. 6. Wood Screws are similar to machine screws but the thread on the screw is a special wood screw thread that can be screwed directly into the wood member or part for fastening a metal or non-metal part with a through hole to a wood member. The connection is also a detachable connection. Kill. A type of fastener having a ring-shaped washer. The supporting surface placed between the bolt, screw or nut and the surface of the connecting part increases the contact surface area of the connected part, reduces the pressure per unit area and protects the surface of the connected part from being damaged. 8. The Retaining Ring is provided in a shaft groove or hole groove of a machine or device to prevent the parts on the shaft or hole from moving from side to side. 9. The PIN is mainly used for parts positioning and some can also be used for parts connecting, fixing parts, transferring power or locking other fasteners. 10. A class of fasteners consisting of a head and a nail rod for fastening and connecting two parts or components with through holes so as to make them a whole. This form of connection is called Rivet Connection, or riveting for short. Non-detachable connection. The rivets on the part must be broken to separate the two parts which are joined together. Kill. Assembly and connecting pair assembly means a kind of fastener which is supplied by combination, such as machine screw or bolt, self-supply screw and flat washer or Spring Washer, lock washer. It means a kind of fastener which is supplied by combination of special bolt, nut and Washer, such as steel structure, with high strength big hexagon head bolt. 12. A dissimilar fastener consisting of light energy and the head of a nail or head of a nail that is fixed to a part or member by welding so that it can be connected to other parts. 13. Steel thread bushing steel thread bushing is a new type of thread connecting element, which is made of high strength and high precision corrosion resistant diamond wire. When the spring is installed on the inner surface of the special screw hole of the Matrix to form the standard screw thread and the screw bolt, the strength and wear resistance of the screw thread can be improved obviously, especially on the low strength materials such as aluminum, magnesium, cast iron and plastic. The locking type is to add one or more locking rings to the ordinary type. Xinxiang Yongda Industrial Co. , Ltd. is specialized in the production of Steel Screw sets manufacturers recommended steel screw sets embedded in aluminum, magnesium alloy, cast iron, fiberglass, plastic and other low, the Standard M and MJ threads can be formed in the threads of the engineering materials with the functions of continuous strength, impact resistance and wear resistance, and can disperse the stress to protect the matrix threads and greatly extend the service life of the Matrix. At the same time, the stress of the thread is improved and the elastic connection is formed to eliminate the pitch and half-angle error between the internal and external threads, so that the load on the thread is evenly distributed and the matrix thread is not damaged and its service life is prolonged

Stainless Steel Screws,Self Tapping Metal Screws,Stainless Steel Bolts,Flange Bolt

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