CN202614500U

CN202614500U - Positioning and phase-locking device for PIV experiment of centrifugal pump

Info

Publication number: CN202614500U
Application number: CN 201220175767
Authority: CN
Inventors: 李昳; 黄远民; 崔巧玲; 金守泉
Original assignee: Zhejiang Sci Tech University ZSTU
Current assignee: Zhejiang Sci Tech University ZSTU
Priority date: 2012-04-23
Filing date: 2012-04-23
Publication date: 2012-12-19
Anticipated expiration: 2022-04-23

Abstract

The utility model relates to a positioning and phase-locking device for a PIV experiment of a centrifugal pump. The technical problem to be solved is to provide a device to be capable of accurately positioning the location of impellers of the centrifugal pump in a rotation state and transmitting a location signal to PIV experimental devices for generating subsequent images when the PIV experiment is carried out by the centrifugal pump; and the device should further has the advantages of simple structure, low cost and high precision. The technical scheme adopted by the positioning and phase-locking device is that: the positioning and phase-locking device comprises a model pump, a motor for driving the model pump, and PIV devices, wherein the PIV devices comprises a computer, a synchronous controller connected with the computer, a laser system which is connected with the synchronous controller and used for irradiating the interior of the model pump, and two CCD cameras which are connected with the computer and used for photographing particle images inside the model pump. The positioning and phase-locking device is characterized in that the motor is provided with a positioning device used for transmitting rotating signals of the motor to the PIV devices.

Description

Centrifugal pump PIV trial position phase-locking device

Technical field

The utility model relates to a kind of device that is used for centrifugal pump internal flow test, specifically is centrifugal pump PIV trial position phase-locking device.

Background technology

Centrifugal pump internal flow research is the emphasis of research both at home and abroad always, mainly contains multiple research methods such as theoretical research, numerical value research and experimental study, and wherein experimental study is one of effective method of fundamental sum.At present along with the needs of engineering practice and modern age optical technology, laser technology and development of computer; Having formed gradually aspect the flow measurement research with particle image velocimetry (PIV), laser inductive fluorescence method etc. is the FLOW VISUALIZATION technology of new generation of representative; Can not only obtain comparatively accurate quantitative measurment ability; And realized the transient state demonstration and measurement of complex space mechanism, therefore significant for the research (especially centrifugal pump internal flow research) of complex flow.

The ultimate principle of PIV technology is: in the flow field, dispense trace particle; Use the pulse laser sheet laser to illuminate institute's flow measurement field; Through double or multiexposure, multiple exposure; Make the image of particle be recorded in egative film or the CCD camera, and adopt optics Young fringe method, correlation method or cross-correlation method to handle the image that is obtained, thereby calculate the velocity vector and other exercise parameters (comprising speed vector figure, speed component figure, motion pattern etc.) of each point in the flow field.From essence, PIV be utilize the following property dispense in the fluid preferably trace particle show this locational flow field velocity.

Because the mobile of centrifugal pump inside is a kind of complex flow of rotation; And the centrifugal pump inner structure has asymmetry; Therefore when carrying out the PIV testing experiment, how the impeller that rotates in the centrifugal pump is carried out track and localization, guarantee that the impeller blade in the captured image all is to be arranged in same position and same runner; So that more accurate through the inner transient images of centrifugal pump of PIV technology generation, be a difficult problem that needs to be resolved hurrily.

Summary of the invention

The purpose of the utility model is the deficiency that overcomes in the above-mentioned background technology; A kind of novel centrifugal pump PIV trial position phase-locking device is provided; This device should be able to be when centrifugal pump carries out the PIV test; Accurately locate the centrifugal pump impeller position in rotating, and this position signalling is passed to the PIV test unit so that follow-up image generates, and this device also should have characteristics simple in structure, that cost is lower and precision is higher.

The technical scheme that the utility model adopts is: centrifugal pump PIV trial position phase-locking device; This device comprises the motor and the PIV device of model pump, driving model pump; Said PIV device comprises computing machine, the isochronous controller that is connected with computing machine, is connected with isochronous controller and is used for the inner laser system of irradiation model pump, is connected and is used to take two CCD cameras of model pump internal particle image with computing machine, it is characterized in that: the locating device to PIV device output motor turn signal is installed on the said motor.

Said locating device comprises that one is installed on the machine operation axle and the shaft encoder of output motor turn signal and is connected and is used to add up the counter that shaft encoder is exported signal with said shaft encoder.

Said counter is electrically connected with said isochronous controller.

The beneficial effect of the utility model is: the centrifugal pump PIV trial position phase-locking device that the utility model provides; Through on the working shaft of motor, connecting a shaft encoder; This shaft encoder can be converted into the rotation situation of machine operation axle pulse signal and be transferred to counter and add up; After the statistical signal of counter reaches predetermined value, will trigger laser system and take pictures; Make that the blade of centrifugal pump impeller all is positioned on the same position when taking pictures, the location lock phase when having realized the PIV testing experiment; Therefore this device is not only simple in structure, easy to operate, and bearing accuracy is high, can adapt to the research needs of centrifugal pump interior flow field, produces a desired effect fully.

Description of drawings

Fig. 1 is the synoptic diagram of the utility model.

Embodiment

As shown in the figure, centrifugal pump PIV trial position phase-locking device comprises the motor 1 and the PIV device of model pump 3, driving model pump; Wherein, said PIV device comprises computing machine 5, isochronous controller 7, laser system 6 and two CCD cameras 4; Computing machine is connected with two CCD cameras with isochronous controller respectively, and isochronous controller is connected with laser system; In addition, shaft encoder 2 is installed on the motor rotation axis, shaft encoder is connected with counter 8, and counter is realized being electrically connected through lead with isochronous controller.

The principle of work of shaft encoder is in the utility model: when the machine operation axle rotates; Shaft encoder will be exported following pulse signal: at first; Two round gratings in the shaft encoder can rotate with the machine operation axle simultaneously; Two light and dark striations signals will be formed after the strain line part of light through the circle grating, the pulse signal of two checkers will be sent behind these two striations signals of photovalve reception; Also will send a Z phase pulse signal in addition on the shaft encoder, be called " revolution pulse " again, the initial point of its expression machine operation axle rotation; These three pulse signals are sent in the counter, and counter is through the quantity of calculating pulse and corner and the rotating speed that frequency just can be measured machine operation axle and centrifugal pump impeller.

Counter is the basic logic device that purposes is the widest in the digital display circuit in the utility model, and its function is that the statistics shaft encoder sends number of pulse signals, and triggers laser system through isochronous controller and send sheet light; In addition, this counter has used LOCK (K/P) key protection keyboard, and can guarantee to be provided with can be by change easily.

Shaft encoder sum counter in the utility model all can obtain through buying.

The job step of the utility model is following:

At first configure counter, motor will drive model pump and rotate when starting, and the shaft encoder that is connected on the machine operation axle is then measured the rotating speed of machine operation axle and sent pulse signal to counter; Counter is added up the pulse signal that receives, and when sending number of pulse signals and reach the setting value of counter, isochronous controller triggers laser system and sends laser under the control of computing machine, and the CCD camera is taken pictures under the control of computing machine simultaneously; So just guaranteed that when taking pictures the blade of impeller just forwards same position on the model pump.

Claims

1. centrifugal pump PIV trial position phase-locking device; This device comprises the motor (1) and the PIV device of model pump (3), driving model pump; The isochronous controller (7) that said PIV device comprises computing machine (5), be connected with computing machine, be connected with isochronous controller and be used for the inner laser system (6) of irradiation model pump, be connected and be used to take two CCD cameras (4) of model pump internal particle image with computing machine, it is characterized in that: the locating device to PIV device output motor turn signal is installed on the said motor.

2. centrifugal pump PIV trial position phase-locking device according to claim 1; It is characterized in that said locating device comprises that one is installed on the machine operation axle and the shaft encoder (2) of output motor turn signal and is connected and is used to add up the counter (8) that shaft encoder is exported signal with said shaft encoder.

3. centrifugal pump PIV trial position phase-locking device according to claim 2 is characterized in that said counter is electrically connected with said isochronous controller.