Pump classification

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来源:    日期:2015-7-27    浏览次数684次

 This can according to its use, manufacturing materials, pumping liquid and pump in the space range classification. However, each classification has its limitations, and the resulting obvious overlap. This paper introduces a basic classification method. Firstly, the principle of energy is defined, and the method of realizing this principle is explained. Therefore, this classification method is only related to the pump itself, but with the pump of any external factors or the material of the pump has nothing to do.

In this classification system, all pumps can be divided into two categories:
(!) Power type pump: in this pump, energy is continuously imposed on liquid, so that the machine liquid velocity increased to exceed the value of the speed of the pump outlet, then, reduce speed in the pump or pump, thus the pressure increased.
(2) volume type pump (also called positive displacement pumps): in this pump. By applying to several closed, fluid filled space in one or several moving boundary, the cycle of the energy to the liquid, so that the pressure directly added to the required numerical, to through the valve or orifice to liquid discharged to the output pipeline to.
GB7021-86 is also based on a variety of methods for the classification and definition of the centrifugal pump:
(1) in the direction of the pump shaft:
Horizontal: the structure of the horizontal direction of the pump shaft.
Vertical structure: vertical shaft.
Oblique type: the structure of the pump shaft and the horizontal plane has a slope angle.
(2) by the type of pump body:
Radial profile: the structure of the plane section of the pump shaft
Section type: a kind of radial profile. Each of them has a cross-sectional area.
Side cover: a kind of radial profile. The side of the housing or the pump cover on both sides.
Axial section: the structure of the plane section of the pump axis. If the plane is horizontal, it is called the open type.
(3) by series:
Single stage: the liquid into the pump only through the structure of the impeller.
Multi stage: the structure of the pump is connected in series with the structure of the impeller. By the number of times known as two, three.
(4) in the form of inhalation:
Single suction: only one side of the impeller has the structure of the suction port.
Double suction impeller: on both sides of the suction or load of two single suction impeller (back-to-back) structure. For multistage pump, as long as the first stage impeller is double suction structure
(5) by supporting form:
Central support type: the structure of a horizontal plane of the pump's supporting plane is arranged in a horizontal plane containing (or near) the pump axis.
Pipe type: the structure can be directly installed on the pipe.
Total seat type: one kind of vertical pump. The drive part is directly mounted on the pump.
Split type: one kind of vertical pump. Pump and drive parts are installed in the upper and lower two different
On the basis of.
Movable type: not installed on the fixed basis, can be used to move the pump and the original motive unit.
(6) by means of a drive:
Direct connection type: the original motive and the pump shaft through the coupling connection.
Gear drive type: the original motive and the pump through the gear drive way.
Hydraulic coupler drive type: the original motive and the pump through a hydraulic coupler device transmission mode.
Belt drive type: the original motive and the pump through the belt pulley device drive way.
Coaxial: motor and pump (a coaxial shaft) way.
(7) by special structure:
Liquid type: one kind of vertical pump. The pump body is lifted in the liquid level below the structure.
Tube type: the outer side of the inner shell is provided with a cylindrical shell, which is mainly used for the multistage high pressure pump.
Double wall shell type: for the convenience of maintenance and replacement, easy to wear and corrosion of the shell, the shell wall is designed into two layers. The general outer layer should have good strength, the inner layer has the wear resistance and corrosion resistance.
Pit barrel: a vertical pump. In order to increase the effective NPSH and the use of the pit as a part of the pump body. Generally used for condensate pump.
Out of the type: a large vertical pump, for the removal of the convenience, the shell (tube) after the installation does not need to remove the impeller, guide vanes, etc..
The self-priming pump can automatically draw to itself: pipeline in the air, and the liquid filled, thus starting without artificial irrigation.
Submersible pump: the whole pump includes motor into the liquid. The electric machine has the type of water, filling and filling.
Shielded electric pump: motor driven by the inner side of the stator with a shield. Shielding pump inside and the pump is connected, no seal part, therefore it does not produce leakage. The outer side of the rotor also has a shielding cover.
(8) by means of axial force balance:
Balance: balance drum drum axial force balance method.
Balance disc: the way of balancing the axial force with the balance disc.
Self balancing; the way of balancing the axial force with the impeller itself or the symmetrical arrangement.
Balance hole type: the way of balancing the axial force with the impeller.
(9) by the use of different main points:
Boiler feed water pump: pump water to boiler.
Condensate pump: condensate pumping in condenser pump. Due to the high vacuum in the condenser, the pump should have a high cavitation performance.
Circulating water pump: the pump that forces the water circulation flow in the closed system, generally for the low lift pump.
Hydraulic pump: high pressure pump hydraulic coal mining with water.
Mine drainage pump: pump drainage outward from the mine.