CN2069149U

CN2069149U - Wall hung demonstrating instrument for self circulation

Info

Publication number: CN2069149U
Application number: CN 90205428
Authority: CN
Inventors: 毛根海
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1990-04-24
Filing date: 1990-04-24
Publication date: 1991-01-09

Abstract

The utility model relates to a wall hung demonstrating instrument for self circulation, the utility model is provided with a water supply apparatus for self circulation and an adjustable mechanism for aeration quantity which are composed of a water tank, an electric water pump and a silicon controlled stepless speed governor. The wall hung demonstrating instrument for self circulation regards a slit channel swept by water as a display surface, air bubble which is formed by inhalant gas bearing current through making use of the water pump is regarded as a wall type teaching laboratory apparatus for labeling the medium and self-circulation water supply. The advantages of this device are flowing atlas can be demonstrated under all kinds of end conditions, current rate and aeration quantity are evenly adjustable steplessly, the effects of demonstration are excellent, the utility model has easy use and installation, saved energy, no pollution, the utility model can be applied for experiment teaching in the courses of a plurality of professional fluid dynamics and communication theory, etc.

Description

Wall hung demonstrating instrument for self circulation

The utility model belongs to the FLOW VISUALIZATION device.

Mobile demonstration equipment is to utilize the spike medium that sightless flow phenomenon is shown, and is beneficial to the loss of flood peak of analyzing and researching, and streams dynamically a kind of teaching and experiment equipment of mechanism such as resistance.Existing this class teaching and experiment equipment is the best (No:89200843.1) with the applicant's patent " wall-hanging bubble trace method flow demonstrator ", this instrument is the spike medium with the air bubble, with the slit flow channel is display surface, his periodical feeding, can hang over metope, can clearly demonstrate multiple mobile image, the number that can hold when at every turn observing is many.Its shortcoming is: must external water source, and need draw and connect to, discharge pipe line, difficulty is installed, aeration structure is a larynx neck self-priming form, must connect a diffuser behind the larynx neck, the platform display surface has reduced the runner useful area of display surface; The air entrainment of this self-priming aeration mode can not be regulated arbitrarily by the decision of flow size.

The utility model purpose is in the bubble trace method flows demonstrator the self-loopa water supply installation to be housed, and does not need external water source; Improve aeration structure air entrainment can be regulated arbitrarily, and can increase the useful area of display surface.

The utility model main points are: be provided with by water tank 7 electric water pump 17, the self-loopa water supply installation that the controllable silicon stepless speed adjusting gear 18 of control pump rotary speed and speed governing knob 8 constitute in the instrument; Aeration structure then is made of the air entrainment controller 15 and the knob 6 that are contained in sluiceway 4 water delivering orifice places; The water delivering orifice axis of sluiceway 4 should be approaching consistent with pump sump mouth of pipe axis, and a guide plate that can rotate is housed in the air entrainment controller 15.Regulate the guide plate of air entrainment controller 15, can enter electric water pump 17 with current through water pump suction pipe 19 for the gas big gun that the current of letting out for 4 times through sluiceway are brought in the water tank 7, and then from the runner of the different shape of pumping line 16 input slit display surfaces 3, forming with the air bubble is the multiple mobile map of spike medium demonstration.

Open knob 8, start electric water pump 17, water in the water tank 7 is inhaled into water pump, and is transported to the inlet of display surface 3 through pumping line 16, gets back to water tank 7 through slit display surface and slit sluiceway 4 then, the self-circulation system of forming current, when no bubble mixed in the water, this circulation system can not show any mobile image, so must mix an amount of bubble in current, aeration method of this mobile demonstrator and air entrainment control principle now 3 make the following instructions as shown in Figure 3 in conjunction with the accompanying drawings:

When current during through slit sluiceway 4 reflow tanks 7, following sluicing with certain flow rate fails to be convened for lack of a quorum and carries secretly in the water body that a large amount of bubbles enter water tank 7, because the outlet axis of slit sluiceway 4 is approaching consistent with the import axis of water pump suction pipe 19, make near the water body of the mouth of pipe of water pump suction pipe 19 contain a large amount of bubbles.Bubble enters electric water pump 17 with current through water pump suction pipe 19, and under the impeller action of water pump high-speed rotation, bubble is blended into countless microbubbles and fully mixed with current.Such aerated flow is transfused in the runner of different shape of slit display surface 3 through pumping line 16, thereby forming with the air bubble is the multiple mobile map of spike medium, because the authenticity of mobile map, sharpness etc. are all relevant with air entrainment, air entrainment control is suitable, and image is not only clear but also true; In addition, when flow velocity changed, in order to reach best display effect, air entrainment also should be regulated, and therefore, air entrainment should be regulated control.The air entrainment adjustment control method of this instrument is to utilize guide plate in the air entrainment controller 15, when rotating guide plate, can change the direction of the stream that sluices down, as following sluicing conductance when the mouth of pipe direction of water pump suction pipe 19, can cause in suction has near the mouth of pipe a large amount of bubbles to be detained, the air entrainment maximum, if sluicing conductance down when departing from suction mouth of pipe direction, just do not have bubble to be detained near suction hose, air entrainment is 0.The guide plate of air entrainment controller 15 is connected with the rotating shaft of knob 6, therefore needs only turn air entrainment controller knob 6, just can regulate the size of air entrainment arbitrarily.

Nowed forming when varying in size for the observation analysis flow velocity, must regulate inflow-rate of water turbine, and inflow-rate of water turbine is relevant with pump rotary speed, so this instrument adopts the controllable silicon stepless speed adjusting gear 18 of may command pump rotary speed to regulate flow by speed governing knob 8, has saved the speed governing valve.

The commercially available finished product that the controllable silicon stepless speed adjusting gear can be fit to according to the watt level apolegamy of electric water pump.

In order to satisfy the wall hanging requirement, electric water pump should be selected the antirust pump of the portable plastics of miniwatt for use.

Slit display surface 3 is to be formed by front panel 10, rear panel 12, middle laminated plank 11 veneers bonding, the front panel material is a transparent organic glass, middle clamp plate is a chromatic organic glass, and is processed into certain flow channel shape, as flaring, convergent, sudden expansion, sudden contraction, peripheral flow etc., form slit and show runner, slit gap the best is 6mm, and daylight lamp 13 is contained in display board two sides, and radiator grille 2 should be able to cover light, in order to avoid direct projection observer eyes, back cover 14 should be handled through blacking on inner bottom plating.

Description of drawings:

Fig. 1 is the flow path boundary figure of mobile demonstrator structure synoptic diagram of wall-hanging self-loopa and III type thereof.

Fig. 2 is the mobile demonstrator side sectional structure synoptic diagram of wall-hanging self-loopa.

Fig. 3 is an aeration theory structure synoptic diagram.

Symbolic significance among all figure:

1 is hanging hole among the figure, the 2nd, face shield, the 3rd, slit display surface, the 4th, slit sluiceway, the 5th, the water inlet port lid, the 6th, aeration controller knob, the 7th, water tank, the 8th, controllable silicon stepless speed adjusting gear knob, the 9th, water pump, electric panel room, the 10th, slit shows front panel, the 11st, laminated plank in the slit, the 12nd, slit display surface rear panel, the 13rd, daylight lamp, the 14th, back cover base plate, the 15th, air entrainment controller, the 16th, pumping line, the 17th, electric water pump, the 18th, the controllable silicon stepless speed adjusting gear, the 19th, water pump suction pipe, the arrow in the accompanying drawing is represented water (flow) direction.

As embodiment, the utility model is made 7 types by the various teaching requirement in the laboratory: with III type (as Fig. 1) is example, and electric water pump is 70W, light 48W, and flow velocity is from 0～V _MaxStepless adjustable, air entrainment about 0～30% is adjustable arbitrarily, can demonstrate 45 °, circular arc, the turbulent fluctuation diffusion of 60 ° of elbows in right angle and jet, wall attachment effect, the mobile image on the pipeline longitudinal sections such as wall impact.Outer cover is made of lighttight chromatic organic glass, and volume is 1450 * 274 * 60mm ³, heavy 9kg.Other 6 kinds of models can be demonstrated multiple flowmeter respectively, multiple valve, multiple hydrodynamic form, multiple tapered pipeline, the mobile images such as fluidic in the control automatically.

Advantage of the present utility model:

1. owing to improve the aeration structure scheme, in the current of water pump output, just mixed bubble, can save patent " 89200843.1 " and adopt diffuser in the larynx neck aeration method, thereby enlarge the effective area of display surface, and can easily runner design be become various required forms. Same 7 types of flow demonstrators, former patent can only be demonstrated the mobile image of 20 kinds of different boundary, and this demonstrator can be demonstrated 30 kinds of different images.

2. air entrainment can be regulated arbitrarily, can regulate definition, can guarantee authenticity again, thereby obtain best demonstration effect.

3. adopt self-loopa to supply water, do not need external water source, save the installation water supply and sewerage pipeline, have on the wall 220V voltage to demonstrate as long as hang, use very convenient. This instrument power savings is good, and every only is about 120W, environmentally safe.

Big or middle, the specially relevant aviation of universities and colleges that the present invention can be widely used in, shipping, the engineering fluid mechanics of the specialty such as harbour, water conservancy and hydropower, civil engineering, metallurgy, plumbing, chemical industry, machinery, oil, traffic, environmental protection, heat energy, fire-fighting, refrigeration, hydraulic drive, meteorology, medical science, bioengineering is in the education experiment of the class courses such as transmission theory and Principles of Chemical Engineering.

Claims

1, the mobile demonstrator of a kind of bubble spike, include slit display surface, aeration structure, slit sluiceway, light and case, it is characterized in that having in the instrument electric water pump [17], the suction hose of water pump connects water tank [7], pump rotary speed is controlled by speed governing knob [8] by a controllable silicon stepless speed adjusting gear [18], the rising pipe of water pump [16] is connected with the inlet of slit display surface [3], the water delivering orifice axis of slit sluiceway [4] should be approaching consistent with pump sump mouth of pipe axis, at sluiceway water delivering orifice place air entrainment controller [15] is housed.

2, mobile demonstrator according to claim 1 is characterized in that a guide plate that can rotate is housed in the described air entrainment controller (15), and guide plate is connected with the rotating shaft of knob (6).