CN103295452B - Fluid experiment tracing pin - Google Patents

Abstract

A fluid experiment device relates to the technical field of experiment instruments and comprises a tracing pin neck, a tracing pin hole, a tracing pin main body, a tracing pin mouth and a tracing pin shoulder. The fluid experiment tracing pin is characterized in that the tracing pin neck is a thin pipe with the wall thickness of 1mm and the inner diameter of 0.3mm, the tracing pin neck and the tracing pin main body are in transition connection through the arc radius of R=1.5mm, the tracing pin shoulder is an arc shoulder of R=1.5mm, the outline of the tracing pin main body is in a cylinder shape, the tracing pin hole is a cylindrical smooth thin hole, the tracing pin hole is formed in the center of the tracing pin main body, the tracing pin main body is connected with the tracing pin mouth, and the taper of the tracing pin mouth is 15 degrees. The external diameter of the tracing pin body is 8.3mm. The hole diameter of the tracing pin hole is 0.3mm, and the outer diameter of an end port of the tracing pin mouth is 2.3mm. The fluid experiment tracing pin is easy to clamp, the perpendicularity is easy to adjust, and reliable experiment data can be obtained easily.

Description

A kind of fluid experiment device

Technical field

A kind of fluid experiment device relates to experimental apparatus technical field.

Background technology

Reynold's number is the accurate number judging flow pattern, if fluid is at straight shape Flow In A Circular Tube, then Reynold's number can be represented by the formula:

$\mathrm{Re}=\frac{\mathrm{du\ρ}}{\mathrm{\μ}}$

In formula, Re---Reynold's number, zero dimension; D---ips, mm;

U---rate of flow of fluid, m/s; ρ---fluid density, kg/m ³;

μ---fluid viscosity; Pas.

For the particular fluid under uniform temperature, at specific Flow In A Circular Tube, Reynold's number is only relevant with rate of flow of fluid.

By newton law of viscosity:

$\mathrm{\τ}=\mathrm{\μ}\frac{\mathrm{du}}{\mathrm{dy}}$

In formula, μ---fluid viscosity; Pas; The radial vertical range of y---pipe, mm;

U---rate of flow of fluid, m/s.

The size of shear stress is directly proportional to the velocity gradient of flow direction to vertical vertical, and the viscosity, mu intrinsic to fluid is relevant, known, because the viscosity of different fluid is different, fluid is when flowing, and flowing in the duct, the flow velocity on each concentric circles in caliber direction is all not identical.

Usual reynolds test instrument is added water in constant voltage tank by pump, under the state water pressure invariableness keeping water spill-over stream, injected in Reynold's number experiment tube by syringe needle by the tracer agent in the traced fluid storage tank on spike then top, areas of permanent pressure, namely can observe the various flows deformation of fluid at the laminar flow of Bottomhole pressure, excess flow and turbulent flow (also claiming turbulent flow), record data calculate the measured value of Reynold's number.

The reynolds test instrument of prior art, Chinese patent 200710049057.0,201020215878.4,201020284487.8,200820107489.2,200410025778.4,89204903.0 and " Experiment of Principles of Chemical Engineering " (21 century institution of higher learning's teaching material, Science Press, Mu Zonggang edits) all unexposedly in experimental teaching material how to make experiment spike pin and experiment tube keeping parallelism, test the technical scheme that spike pin is in experiment tube center; The Reynolds experiment device used now is also because spike pin and experiment tube are difficult to concentric, and spike pin gives guarantee its verticality very much, the elongated flexible distortion of the thin syringe needle of spike needle tubing wall besides, therefore, the experiment that current college student does only is called---Reynolds lecture experiment, the Reynold's number deviation of measuring is very large, and " Reynold's number " that also namely recorded by existing Reynolds experiment device cannot reflect the pattern of flow of fluid, can only be Reynolds lecture experiment.

Summary of the invention

For the deficiency that prior art exists, an object of the present invention fluid experiment spike pin and up and down spike needle holder are convenient to clamping, realize and experiment tube keeping parallelism; Two of object is the problems solving the flexible distortion of spike pin elongated needle in prior art.Following technical scheme is adopted for achieving the above object:

1, a kind of fluid experiment device, comprise spike pin and upper and lower spike needle holder, spike pin comprises spike pin neck 101, spike pin hole 102, spike pin main body 103, spike pin mouth 104, spike pin shoulder 105, upper and lower spike needle holder comprises the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, it is characterized in that: spike pin neck 101 is wall thickness=1mm, the tubule of internal diameter=0.3mm, spike pin neck 101 is connected with the arc radius transition of spike pin main body 103 by R=1.5mm, spike pin shoulder 105 is the circular arc shoulder of R=1.5mm, spike pin main body 103 gabarit is cylindrical, spike pin hole 102 is columniform smooth pore, spike pin main body 103 connects spike pin mouth 104, tapering=15 ° of spike pin mouth 104, the left plate washer 201 of constant voltage tank connects pivot arm bearing 202, pivot arm bearing 202 connects pivot arm 203 by rotating tight fixed bolt 208, pivot arm 203 is by support tight fixed bolt 207 connecting angle iron support 204, and spike pin 21 is fixed on angle iron bracket 204 by pipe clamp tight fixed bolt 206 and spike needle tubing card 205, pivot arm 203 there are straight shape elongated hole 371, support tight fixed bolt 207 are connected with pivot arm 203 by angle iron bracket 204 with support locknut 373 by expandable washer 372 through straight shape elongated hole 371.

2, described a kind of fluid experiment device, is characterized in that: the external diameter=8.3mm of spike pin main body 103.

3, described a kind of fluid experiment device, is characterized in that: the aperture=0.3mm of spike pin hole 102, the external diameter=2.3mm of spike pin mouth 104 port.

4, described a kind of fluid experiment device, is characterized in that: described spike pin is stainless steel material.

Accompanying drawing explanation

Fig. 1: fluid experiment spike pin cut-open view;

Fig. 2: reynolds test instrument front view;

Fig. 3: reynolds test instrument A-A broken section enlarged drawing;

Fig. 4: B to partial enlarged drawing;

In figure: 1 traced fluid storage bottle, 2 spike bottle racks, 3 constant voltage tanks, 4 intake chambers, 5 overflow grooves, 6 upper hoses, 7 run-down pipes, 8 rising pipes, 9 spinner-type flowmeters, 10 surplus valves, 11 flow regulation gate valves, 12 low level hoppers, 13 ebullators, 14 pump discharge valves, 15 pump inlet valves, 16 low level hopper outlet valves, 17 movable frameworks, 18 experiment tubes, the 19 experiment mouths of pipe, about 20 spike needle holders, 21 spike pins, 22 traced fluid stream guiding tube, 23 spike valves, 101 spike pin necks, 102 spike pin holes, 103 spike pin main bodys, 104 spike pin mouths, 105 spike pin shoulders, the left plate washer of 201 constant voltage tank, 202 pivot arm bearings, 203 pivot arms, 204 angle iron brackets, 205 spike needle tubing cards, 206 pipe clamp tight fixed bolts, 207 support tight fixed bolts, 208 rotate tight fixed bolt, 371 straight shape bolts hole, 372 expandable washers, 373 support locknuts, 207 support tight fixed bolts.

Beneficial effect

Overcome in the Reynolds experiment device of prior art, due to the concentricity of spike pin and experiment tube, and the verticality of spike pin is difficult to regulate fixing, therefore, with actual, the conclusion drawn judges that the Reynold's number deviation of fluid pattern of flow is very large, apply fluid experiment spike pin of the present invention, fluid experiment spike pin can be made to be easy to clamping, be easy to regulate verticality, be easy to obtain more reliable experimental data.

Embodiment

Embodiment

1, a kind of fluid experiment device, comprise spike pin and upper and lower spike needle holder, spike pin comprises spike pin neck 101, spike pin hole 102, spike pin main body 103, spike pin mouth 104, spike pin shoulder 105, it is characterized in that: spike pin neck 101 is wall thickness=1mm, the tubule of internal diameter=0.3mm, spike pin neck 101 is connected with the arc radius transition of spike pin main body 103 by R=1.5mm, spike pin shoulder 105 is the circular arc shoulder of R=1.5mm, spike pin main body 103 gabarit is cylindrical, spike pin hole 102 is columniform smooth pore, spike pin hole 102 is positioned at the center of spike pin main body 103, spike pin main body 103 connects spike pin mouth 104, tapering=15 ° of spike pin mouth 104, adopt spike pin neck 101 and spike pin main body 103 to be connected by the arc radius transition of R=1.5mm and spike pin to take on 105 be that the circular arc of R=1.5mm is takeed on, fluid experiment spike pin can be avoided to have the flowing of outstanding corner angle convection cell to produce considerable influence.

2, described a kind of fluid experiment device, is characterized in that: the external diameter=8.3mm of spike pin main body 103.Spike pin main body 103 adopts the wall thickness of 4mm, and laser intensity is high, not yielding.

3, described a kind of fluid experiment device, is characterized in that: the aperture=0.3mm of spike pin hole 102, the external diameter=2.3mm of spike pin mouth 104 port.

4, described a kind of fluid experiment device, is characterized in that: described spike pin is stainless steel material.

Below in conjunction with the application of spike pin in reynolds test instrument, spike pin of the present invention is described further.

1, reynolds test instrument comprises: traced fluid storage bottle 1, spike bottle rack 2, constant voltage tank 3, intake chamber 4, overflow groove 5, upper hose 6, run-down pipe 7, rising pipe 8, spinner-type flowmeter 9, surplus valve 10, flow regulation gate valve 11, low level hopper 12, ebullator 13, pump discharge valve 14, pump inlet valve 15, low level hopper outlet valve 16, movable framework 17, experiment tube 18, the experiment mouth of pipe 19, upper and lower spike needle holder 20, spike pin 21, traced fluid stream guiding tube 22, spike valve 23, the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotate tight fixed bolt 208, straight shape bolt hole 371, expandable washer 372, support locknut 373, support tight fixed bolt 207,

Spike valve 23 is connected bottom traced fluid storage bottle 1, traced fluid storage bottle 1 is positioned on spike bottle rack 2, spike bottle rack 2 is welded to connect in constant voltage tank 3 top, spike valve 23 connects traced fluid stream guiding tube 22, low level hopper outlet valve 16 is connected bottom low level hopper 12, low level hopper outlet valve 16 connects upper hose 6, pump inlet valve 15 ebullator 13 upper hose 6 is equipped with, pump discharge valve 14, ebullator 13 is between pump inlet valve 15 and pump discharge valve 14, upper hose 6 connects bottom intake chamber 4, run-down pipe 7 is connected bottom overflow groove 5, experiment tube 18 connects rising pipe 8, spinner-type flowmeter 9 rising pipe 8 is equipped with, flow regulation gate valve 11 rising pipe 8 is equipped with,

Connect run-down pipe 7 bottom overflow groove 5, run-down pipe 7 is equipped with surplus valve 10, run-down pipe 7 outlet is positioned at above low level hopper 12; Constant voltage tank 3, intake chamber 4 and the overflow groove 5 rectangular parallelepiped tank that all top is uncovered;

Upper and lower spike needle holder 20 is identical two covers of shaped materials size, and upper and lower spike needle holder 20 is individually fixed in middle and upper part and middle and lower part (for the fixing spike pin 21) of the left plate washer of constant voltage tank 3; Traced fluid stream guiding tube 22 connects spike pin mouth 104 upper end, spike pin 21 is fixed on upper and lower spike needle holder 20 by spike needle tubing card 205 and pipe clamp tight fixed bolt 206, spike pin mouth 104 lower end is arranged in experiment tube mouth 19, spike pin mouth 104 lower end lower than experiment the mouth of pipe 19 on along the horizontal plane, spike pin 21 is with the experiment mouth of pipe 19, experiment tube 18 is concentric (avoids the continuous overflow of the fluid in constant voltage tank 3, feed through to the tracer agent sprayed by spike pin mouth 104 to be affected), the experiment mouth of pipe 19 connects experiment tube 18;

Upper and lower spike needle holder 20 comprises the left plate washer 201 of constant voltage tank, pivot arm bearing 202, pivot arm 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, rotates tight fixed bolt 208, it is characterized in that: the left plate washer 201 of constant voltage tank connects pivot arm bearing 202, pivot arm bearing 202 connects pivot arm 203 by rotating tight fixed bolt 208, pivot arm 203 is by support tight fixed bolt 207 connecting angle iron support 204, and spike pin 21 is fixed on angle iron bracket 204 by pipe clamp tight fixed bolt 206 and spike needle tubing card 205;

Pivot arm 203 there are straight shape elongated hole 371, support tight fixed bolt 207 are connected with pivot arm 203 by angle iron bracket 204 with support locknut 373 by expandable washer 372 through straight shape elongated hole 371.(be convenient to the lateral length regulating angle iron bracket 204.)

Claims (4)

1. a fluid experiment device, comprise spike pin and upper and lower spike needle holder, spike pin comprises spike pin neck, spike pin hole, spike pin main body, spike pin mouth, spike pin is takeed on, upper and lower spike needle holder comprises the left plate washer of constant voltage tank, pivot arm bearing, pivot arm, angle iron bracket, spike needle tubing card, pipe clamp tight fixed bolt, support tight fixed bolt, rotate tight fixed bolt, it is characterized in that: spike pin neck is wall thickness=1mm, the tubule of internal diameter=0.3mm, spike pin neck is connected with the arc radius transition of spike pin main body by R=1.5mm, spike pin is takeed on as the circular arc of R=1.5mm is takeed on, spike pin main body gabarit is cylindrical, spike pin hole is columniform smooth pore, spike pin hole is positioned at the center of spike pin main body, spike pin main body connects spike pin mouth, tapering=15 ° of spike pin mouth,

The left plate washer of constant voltage tank connects pivot arm bearing, and pivot arm bearing connects pivot arm by rotating tight fixed bolt, and pivot arm is by support tight fixed bolt connecting angle iron support, and spike pin fixes on angle iron bracket by pipe clamp tight fixed bolt and spike needle tubing;

Pivot arm there are straight shape elongated hole, support tight fixed bolt are connected with pivot arm by angle iron bracket with support locknut by expandable washer through straight shape elongated hole.

2. a kind of fluid experiment device as claimed in claim 1, is characterized in that: the external diameter=8.3mm of spike pin main body.

3. a kind of fluid experiment device as claimed in claim 1, is characterized in that: the aperture=0.3mm of spike pin hole, the external diameter=2.3mm of spike pin mouth port.

4. a kind of fluid experiment device as claimed in claim 1, is characterized in that: described spike pin is stainless steel material.