Method, device and system for adjusting centrifugal water pump inlet flow field
An adjustment method and technology for centrifugal water pumps, applied in pump control, non-variable-capacity pumps, machines/engines, etc., can solve problems such as diversion failure, cavitation, and water belt damage, avoid cavitation, improve flow The effect of field distribution
Active Publication Date: 2014-05-28
XCMG CONSTR MACHINERY
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Problems solved by technology
[0005] The existing technology usually uses a fixed diversion device, which can play a role in diversion within a certain flow range, but with the change of the working flow of the pump, its diversion angle cannot be adjusted
When the flow rate exceeds a certain range, the diversion effect fails, and cavitation occurs, causing the pump to fail to work normally. The specific performance is that the outlet pressure fluctuates at a low frequency and high amplitude, and at the same time, the water belt is excited and shakes violently and rubs against the ground. destroy
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[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0062] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
[0063] At the same time, it should be understood that, for the convenience of d...
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The invention discloses a method, device and system for adjusting a centrifugal water pump inlet flow field. The method comprises the steps that data processing is carried out on collected work parameter signals, and the maximum output amplitude of the work parameter signals and the frequency generated when the amplitude is maximum are acquired; the frequency or the amplitude is used as the subordinating degree function of variables, and the membership degree of the frequency on fuzzy subsets on the discourse domain of the frequency and the membership degree of the amplitude on fuzzy subsets on the discourse domain of the amplitude are respectively acquired; the frequency membership degree and the amplitude membership degree are utilized for inquiring a preset fuzzy control table, and the membership degrees of control angles on fuzzy subsets on the discourse domains of the control angles are acquired; defuzzification is carried out on the membership degrees of the control angles to obtain the corresponding control angles; the angle of a water inlet adjusting valve is adjusted to the control angles. The work parameter signals are collected in real time, the angle of the valve is automatically adjusted according to the changes of the work parameter signals, therefore, the distribution of the water pump inlet flow field is improved, and a water pump cavitation erosion phenomenon is prevented from happening so that the performance of a water pump can be achieved completely.
Description
technical field [0001] The invention relates to the field of engineering machinery, in particular to a method, device and system for adjusting the inlet flow field of a centrifugal water pump. Background technique [0002] Fire trucks generally use a centrifugal water pump as their power source. Due to the constraints of the installation space of the vehicle, it is impossible to install a long straight pipe in front of the water pump inlet to improve the flow field distribution of the water pump inlet. During the working process of the water pump, due to the The uneven pressure distribution of the flow field makes the water pump prone to cavitation, which greatly reduces the working efficiency of the water pump and affects the overall performance of the fire truck. [0003] The cavitation is also called cavitation, which is a phenomenon unique to hydraulic machinery. When the local liquid flow pressure in the flow channel decreases to a value close to the vaporization pressu...
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IPC IPC(8): F04D15/00
Inventor 吕昌刘汉光郑淑萍
Owner XCMG CONSTR MACHINERY