CN202976613U - Trace indicating pin - Google Patents

Abstract

The utility model relates to a trace indicating pin and belongs to the technical field of experimental instruments. The trace indicating pin is composed of a trace indicating pin hole, a trace indicating pin main body and a trace indicating pin mouth. The trace indicating pin is characterized in that the trace indicating pin is a fusiform trace indicating pin which is thin at two ends and is thick in the middle, and is in central symmetry; the contour of the trace indicating pin main body is cylinder-shaped; the trace indicating pin hole is a cylindrical smooth small hole; the taper of the trace indicating pin mouth is 15 degrees; the outer diameter of the trace indicating pin main body is 8.3 mm; the aperture of the trace indicating pin hole is 0.8 mm; the outer diameter of the trace indicating pin mouth is 2.3 mm; and the trace indicating pin is made of a stainless steel material. The trace indicating pin is adopted in a Reynolds experiment device. With the trace indicating pin of the utility model adopted, the trace indicating pin can be clamped easily, verticality can be adjusted easily, and more reliable experimental data can be obtained easily.

Description

A kind of spike pin

Technical field

A kind of spike pin relates to the experimental apparatus technical field.

Background technology

Reynold's number is the accurate number of judgement flow pattern, if fluid at straight shape Flow In A Circular Tube, 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; Y---pipe is vertical range radially, 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, as can be known, because the viscosity of different fluid is different, fluid flows ducted when mobile, and the flow velocity on each concentric circles of caliber direction is all not identical.

Usually reynolds test instrument is to add water by pump in the constant voltage tank, under the state water pressure invariableness that keeps water spill-over stream, by spike then the tracer agent in the traced fluid storage tank on areas of permanent pressure top injected in the Reynold's number experiment tube by syringe needle, namely can observe the various flows deformation of fluid mobile laminar flow, excess flow and turbulent flow (also claiming turbulent flow) in pipe, 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 chief editor) in experimental teaching material all unexposed how to make experiment spike pin with the experiment tube keeping parallelism, test the technical scheme that the spike pin is in the experiment tube center; The Reynolds experiment device that is now using also is difficult to concentric because of spike pin and experiment tube, and the spike pin is given and is guaranteed its verticality very much, the elongated flexible distortion of the thin syringe needle of spike needle tubing wall besides, therefore, the experiment that present college student is done only is called---the Reynolds lecture experiment, the Reynold's number deviation of measuring is very large, and " Reynold's number " that also namely records by existing Reynolds experiment device can't reflect the pattern of flow of fluid, can only be the Reynolds lecture experiment.

Summary of the invention

For the deficiency that prior art exists, one of the purpose of this utility model spike pin is convenient to clamping, realizes and the experiment tube keeping parallelism; Two of purpose is the problems that solve the flexible distortion of spike pin elongated needle in prior art.Adopt following technical scheme for achieving the above object:

1, a kind of spike pin, formed by spike pin hole 101, spike pin main body 102, spike pin mouth 103, it is characterized in that: the spike pin is thick centrosymmetric fusiformis spike pin between the detail of two ends, up and down, spike pin main body 102 gabarits are cylindrical, spike pin hole 101 is columniform smooth pore, the tapering of spike pin mouth 103=15 °.

2, described a kind of spike pin is characterized in that: the external diameter=8.3mm of spike pin main body 102, the aperture=0.8mm of spike pin hole 101, the external diameter=2.3mm of spike pin mouth 103.

3, described spike pin is stainless steel material.

Description of drawings

Fig. 1: a kind of spike pin cut-open view figure;

Fig. 2: reynolds test instrument front view;

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

Fig. 4: B is to partial enlarged drawing;

in figure: 101 spike pin holes, 102 spike pin main bodys, 103 spike pin mouths, 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, spike needle holder Shang Xia 20, 21 spike pins, 22 traced fluid stream guiding tube, 23 spike valves, the 201 left plate washers of 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 rotation tight fixed bolts, 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, concentricity due to spike pin and experiment tube, and the verticality of spike pin is difficult to regulate fixing, therefore, the conclusion that draws is very large with the Reynold's number dispersion of actual judgement Fluid Flow in A type, and problem on the low side, use spike pin of the present utility model, can make the spike pin be easy to clamping, be easy to regulate verticality, be easy to obtain more reliable experimental data.

Embodiment

Below in conjunction with drawings and Examples, a kind of spike pin of the present utility model is described further.

Embodiment

1, a kind of spike pin, formed by spike pin hole 101, spike pin main body 102, spike pin mouth 103, it is characterized in that: the spike pin is thick centrosymmetric fusiformis spike pin between the detail of two ends, up and down, spike pin main body 102 gabarits are cylindrical, spike pin hole 101 is columniform smooth pore, the tapering of spike pin mouth 103=15 °.

2, described a kind of spike pin is characterized in that: the external diameter=8.3mm of spike pin main body 102, the aperture=0.8mm of spike pin hole 101, the external diameter=2.3mm of spike pin mouth 103.

3, described spike pin is characterized in that: the spike pin is stainless steel material.In conjunction with reynolds test instrument, the application of a kind of spike pin in reynolds test instrument once is described

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, up and down 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, rotation tight fixed bolt 208, straight shape bolt hole 371, expandable washer 372, support locknut 373, support tight fixed bolt 207,

traced fluid storage bottle 1 bottom connects spike valve 23, 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 tops, spike valve 23 connects traced fluid stream guiding tube 22, low level hopper 12 bottoms connect low level hopper outlet valve 16, low level hopper outlet valve 16 connects upper hose 6, pump inlet valve 15 ebullators 13 are housed on upper hose 6, pump discharge valve 14, ebullator 13 is between pump inlet valve 15 and pump discharge valve 14, upper hose 6 connects intake chamber 4 bottoms, overflow groove 5 bottoms connect run-down pipe 7, experiment tube 18 connects rising pipe 8, spinner-type flowmeter 9 is housed on rising pipe 8, flow regulation gate valve 11 is housed on rising pipe 8,

Overflow groove 5 bottoms connect run-down pipes 7, and surplus valve 10 is housed on run-down pipe 7, and run-down pipe 7 outlets are positioned at low level hopper 12 tops; Constant voltage tank 3, intake chamber 4 and overflow groove 5 be the uncovered rectangular parallelepiped tank in top all;

Up and down spike needle holder 20 is identical two covers of shape scantling, and up and down spike needle holder 20 is individually fixed in middle and upper part and the middle and lower part (being used for fixedly spike pin 21) of constant voltage tank 3 left plate washers; Traced fluid stream guiding tube 22 connects spike pin mouth 103 upper ends, spike pin 21 is fixed on up and down spike needle holder 20 by spike needle tubing card 205 and pipe clamp tight fixed bolt 206, spike pin mouth 103 lower ends are arranged in experiment tube mouth 19, spike pin mouth 103 lower ends are lower than testing on the mouth of pipe 19 along surface level, spike pin 21 is with the experiment mouth of pipe 19, experiment tube 18 is concentric (avoids the continuous overflow of fluid in constant voltage tank 3, the tracer agent that feeds through to by 103 ejections of spike pin mouth is affected), the experiment mouth of pipe 19 connects experiment tube 18;

Up and down 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, rotation tight fixed bolt 208, the left plate washer 201 of constant voltage tank connects pivot arm bearing 202, pivot arm bearing 202 connects pivot arm 203 by rotation tight fixed bolt 208, pivot arm 203 is by support tight fixed bolt 207 connecting angle iron supports 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;

Having straight shape slotted hole 371, support tight fixed bolt 207 to pass straight shape slotted hole 371 on pivot arm 203 is connected with the support locknut by expandable washer 372 angle iron bracket 204 is connected with pivot arm 203.(be convenient to regulate the lateral length of angle iron bracket 204.）

Claims (3)

1. spike pin, formed by spike pin hole, spike pin main body, spike pin mouth, it is characterized in that: a kind of spike pin is thick centrosymmetric fusiformis spike pin between the detail of two ends, up and down, spike pin main body gabarit is cylindrical, the spike pin hole is columniform smooth pore, the tapering of spike pin mouth=15 °.

2. a kind of spike pin as claimed in claim 1, is characterized in that: the external diameter=8.3mm of spike pin main body, the aperture=0.8mm of spike pin hole, the external diameter=2.3mm of spike pin mouth.

3. a kind of spike pin as claimed in claim 1, it is characterized in that: a kind of spike pin is stainless steel material.

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