Flow Rate Regularity in Rotary Trochoidal-Lobe Pumps

1994 ◽  
Author(s):  
G. Mimmi ◽  
P. Pennacchi
Keyword(s):  
Flow Rate ◽  
Distinctive Feature ◽  
Pump Design ◽  
Instantaneous Flow ◽  
Positive Displacement ◽  
Involute Gear ◽  
Gear Pumps ◽  
Points Of View ◽  
Lobe Pump ◽  
Instantaneous Flow Rate

Abstract This paper analyses a particular type of rotary positive-displacement pumps with lobes having epitrochoidal flanks, whose distinctive feature is that of providing a strictly constant geometric instantaneous flow rate. The pump design is analysed from geometric and kinematical points of view. Then the behavior of this type of lobe pump is compared with that of involute gear pumps.

Involute Gear Pumps Versus Lobe Pumps: A Comparison

1997 ◽  
Vol 119 (4) ◽  
pp. 458-465 ◽  
Author(s):  
G. C. Mimmi ◽  
P. E. Pennacchi
Keyword(s):  
Optimum Design ◽  
Flow Rate ◽  
Design Parameters ◽  
Specific Flow Rate ◽  
Specific Flow ◽  
Positive Displacement ◽  
Involute Gear ◽  
Performance Indexes ◽  
Rotary Pumps ◽  
Gear Pumps

In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes; one of which, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyzed internal involute gear pumps and internal lobe pumps, that have similar operations but different performances. The design parameters and the way to optimize the performances are proposed for both cases. Finally a comparison is made between the two types of pumps with optimum design parameters.

INTERNAL LOBE PUMP DESIGN

1997 ◽  
Vol 21 (2) ◽  
pp. 109-121 ◽  
Author(s):  
G. Mimmi ◽  
P. Pennacchi
Keyword(s):  
Flow Rate ◽  
Design Parameters ◽  
Specific Flow ◽  
Pump Design ◽  
Positive Displacement ◽  
Performance Indexes ◽  
Rotor Profile ◽  
Main Components ◽  
Definition Of ◽  
Lobe Pump

The subject of this paper is the theoretical analysis of the internal lobe pump which is a particular type of positive displacement rotary pump. The main components of the pump are the rotors: usually the outer one is characterised by lobes with circular shape, while the inner rotor profile is determined as conjugate to the other. For this reason the first topic presented here is the definition of the geometry of the rotors starting from the design parameters. The choice of these parameters is subject to some limitations in order to avoid inner rotor undercutting and to limit the pressure angle between the rotors. Now we will consider the design optimisation. The first step is the determination of the instantaneous flow rate as a function of the design parameters. This allows us to calculate two performance indexes commonly used for the study of positive displacement pumps: the flow rate irregularity and the specific flow rate. These indexes are used to optimise the design of the pump and to obtain the sets of optimum design parameters. Finally further considerations are presented regarding the calculation and the use of other performance indexes, the specific slipping and the rotor curvature, which are particularly suitable for giving more elements for the analysis of this case.

Involute Gear Pumps Versus Lobe Pumps: A Comparison

1996 ◽  
Author(s):  
Giovanni C. Mimmi ◽  
Paolo E. Pennacchi ◽  
Carlo G. Savi
Keyword(s):  
Optimum Design ◽  
Flow Rate ◽  
Design Parameters ◽  
Specific Flow Rate ◽  
Specific Flow ◽  
Positive Displacement ◽  
Involute Gear ◽  
Performance Indexes ◽  
Rotary Pumps ◽  
Gear Pumps

Abstract In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes: one of these, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyze internal involute gear pumps and internal lobe pumps, that have similar way to operate but different performances. The design parameters and the way to optimize the performances are summarized for both cases. Finally a comparison between the two types of pumps is proposed, along with some optimum design cases.

Experimental Investigation of Flowrate Irregularity in Rotary Gear Pumps

1992 ◽  
Author(s):  
G. Mimmi
Keyword(s):  
Experimental Investigation ◽  
Flow Rate ◽  
Experimental Tests ◽  
Periodic Variation ◽  
Experimental Results ◽  
Gear Pump ◽  
Gear Pumps ◽  
Hot Film ◽  
Instantaneous Flow Rate ◽  
External Gear Pump

Abstract In a previous paper the author proposed a method to reduce the periodic variation in flow rate for an external gear pump. To verify the experimental results, a series of experimental tests on a expressly realized gear pump, was carried out. The pump was equipped with relieving grooves milled into the side plates. The tests were done on a closed piping specifically realized and equipped for measuring the instantaneous flow rate of the fluid through a wedge-shaped hot film probe.

The Electronic Part of the Metal Tube Rotameter

2013 ◽  
Vol 419 ◽  
pp. 661-666 ◽  
Author(s):  
Bo Mo ◽  
Fei Yu Jiang ◽  
Hui Xin Zhang
Keyword(s):  
Flow Rate ◽  
Electric Circuit ◽  
Magnetic Sensors ◽  
Metal Tube ◽  
Flow Signal ◽  
Instantaneous Flow ◽  
Electronic Part ◽  
Flow Rate Change ◽  
Fitting In ◽  
Instantaneous Flow Rate

The electronic part of the metal tube rotameter which is based on the magnetic sensors and microcontroller C8051F005 is studied. The flow rate change causes the change of the floats position in the metal tube and leads to rotation of the coupling magnet. Then the change of magnetic angle is detected by the magnetoresistive sensors, and a signal is generated. The signal is processed by the electric circuit and made available for the microcontroller for sampling. Then it will has linearization fitting in the microcontroller and finally has a output. This system could automatically sample the flow signal, calculate the instantaneous flow rate, and display them on the LCD screen.

Rotor Design and Optimization in Internal Lobe Pumps

1997 ◽  
Vol 50 (11S) ◽  
pp. S133-S141 ◽  
Author(s):  
Giovanni Mimmi ◽  
Paolo Pennacchi
Keyword(s):  
Flow Rate ◽  
Performance Comparison ◽  
Definite Function ◽  
Pump Design ◽  
Design And Optimization ◽  
Performance Indexes ◽  
New Type ◽  
Improved Performance ◽  
Lobe Pump ◽  
Rotor Curvature

The topic of this paper is the design of internal lobe pumps and their optimization which is based on specific performance indexes. Internal lobe pumps can be classified as different types depending on the shape of the lobe of the outer rotor. First, the design of internal lobe pumps with elliptical, sinusoidal, and polycircular lobe profiles is considered. The latter is a new type of lobe profile with special shape whose curvature follows a definite function. Then we introduce the performance indexes used for the comparison. Some of these indexes, such as the flow rate irregularity, are commonly used for performance comparison, while others, such as the specific slipping and the rotor curvature, are particularly suitable in this case. The comparisons are made with the circular type that had been analyzed by the authors in previous papers (see eg, Mimmi, Pannacchi, and Savi (1996), Internal Lobe Pump Design, Mechanics in design - Proc CSME Forum ’96, SA Meguid (ed), Toronto, Ontario, Canada). It is not easy to univocally state the superiority of one type with respect to the others, however, it is possible to notice that elliptical and polycircular types are comparable to the circular ones in terms of flow rate irregularity, but have improved performance in terms of specific slipping and rotor curvature.

A Measurement of Instantaneous Flow Rate of an Automotive Gaseous Fuel Injector

2007 ◽  
Author(s):  
Mikiya Araki ◽  
Yasuhiro Fujiwara ◽  
Seiichi Shiga ◽  
Hisao Nakamura ◽  
Tomio Obokata
Keyword(s):  
Flow Rate ◽  
Gaseous Fuel ◽  
Fuel Injector ◽  
Instantaneous Flow ◽  
Instantaneous Flow Rate
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