CN202976615U - Tracing-needle cantilever positioning device - Google Patents

Abstract

The utility model relates to the technical field of experimental device, in particular to a tracing-needle cantilever positioning device. The tracing-needle cantilever positioning device comprises tracing needle clamping devices, a constant-pressure water tank left baffle plate, a cantilever support, a cantilever, an angle iron bracket, a tracing needle pipe clamp, pipe clamp locking bolts, bracket locking bolts, a cantilever locking bolt, connection locking bolts, a straight-shape bolt hole and a locking nut, and is characterized in that: the tracing needle clamping devices are two sets of identical shape, materials and size, and are respectively fixed on the middle upper part and middle lower part of the constant-pressure water tank left baffle plate; and the constant-pressure water tank left baffle plate is connected with the cantilever support through the connection locking bolts, the cantilever support is connected with the cantilever through the cantilever locking bolt, the cantilever is connected with the angle iron bracket through the bracket locking bolts, and the tracing needle is fixed on the angle iron bracket through the pipe clamp locking bolts and the tracing needle pipe clamp. The tracing-needle cantilever positioning device can overcome the problem of the reynolds experimental device in the prior art that the verticality of the tracing needle is difficult to adjust and fix due to the concentricity of the tracing needle and the experimental pipe.

Description

Spike pin cantilever locating device

Technical field

Spike pin cantilever locating device relates to the experimental provision 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 difficult to guarantee its verticality, 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, " 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 is to provide a kind of spike pin and experiment tube of using to keep concentric device, and two of purpose is to guarantee to be easy to adjust the position of spike pin in installation process.

1, spike pin cantilever locating device comprises spike pin clamping device 20, the left plate washer 201 of constant voltage tank, cantilever bearing 202, cantilever 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, cantilever tight fixed bolt 208, connects tight fixed bolt 209, straight shape bolt hole 371, expandable washer 372, locknut 373; It is characterized in that: described spike pin clamping device 20 is identical two covers of shape scantling, and spike pin clamping device 20 is individually fixed in middle and upper part and the middle and lower part of constant voltage tank 3 left plate washers;

The left plate washer 201 of constant voltage tank is by connecting tight fixed bolt 209 connecting cantilever bearings 202, cantilever bearing 202 is by cantilever tight fixed bolt 208 connecting cantilevers 203, cantilever 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.

2, described spike pin cantilever locating device is characterized in that: have straight shape slotted hole 371, support tight fixed bolt 207 to pass straight shape slotted hole 371 on described cantilever 203 and are connected with locknut by expandable washer 372 angle iron bracket 204 is connected with cantilever 203.

Description of drawings

Fig. 1: reynolds test instrument front view;

Fig. 2: A-A spike pin cantilever locating device cutaway view Amplified image;

Fig. 3: B is to partial enlarged drawing;

Fig. 4: C is to partial enlarged drawing;

Fig. 5: spike pin 21 profiles;

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, 20 spike pin clamping devices, 21 spike pins, 22 traced fluid stream guiding tube, 23 spike valves, 41 spike pin necks, 42 spike needle tubings, 43 spike needle tubing walls, 44 spike pin mouths, the 201 left plate washers of constant voltage tank, 202 cantilever bearings, 203 cantilevers, 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, 209 connect tight fixed bolt, 371 straight shape bolts hole, 372 expandable washers, 373 support locknuts.

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 problem that the conclusion that draws is very large with the Reynold's number deviation of actual judgement Fluid Flow in A type, after using device of the present utility model, experimental result matches with the Reynold's number of judgement Fluid Flow in A type;

Embodiment

Embodiment

For the deficiency that prior art exists, one of the purpose of this utility model is to provide a kind of spike pin and experiment tube of using to keep concentric device, and two of purpose is to guarantee to be easy to adjust the position of spike pin in installation process.For above-mentioned purpose adopts following technical scheme:

1, spike pin cantilever locating device comprises spike pin clamping device 20, the left plate washer 201 of constant voltage tank, cantilever bearing 202, cantilever 203, angle iron bracket 204, spike needle tubing card 205, pipe clamp tight fixed bolt 206, support tight fixed bolt 207, cantilever tight fixed bolt 208, connects tight fixed bolt 209, straight shape bolt hole 371, expandable washer 372, locknut 373; It is characterized in that: described spike pin clamping device 20 is identical two covers of shape scantling, and spike pin clamping device 20 is individually fixed in the middle and upper part of constant voltage tank 3 left plate washers and middle and lower part (be used for regulating the front and back position of spike pin 21 and fixedly spike pin 21);

The left plate washer 201 of constant voltage tank is by connecting tight fixed bolt 209 connecting cantilever bearings 202, cantilever bearing 202 is by cantilever tight fixed bolt 208 connecting cantilevers 203, cantilever 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.

2, described spike pin cantilever locating device is characterized in that: have straight shape slotted hole 371, support tight fixed bolt 207 to pass straight shape slotted hole 371 on described cantilever 203 and are connected with locknut by expandable washer 372 angle iron bracket 204 is connected with cantilever 203.(be convenient to regulate the lateral length of angle iron bracket 204.）

The utility model is described further at reynolds test instrument below in conjunction with embodiment and spike pin cantilever clamping device

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, spike pin clamping device 20, spike pin 21, traced fluid stream guiding tube 22, spike valve 23, spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44, the left plate washer 201 of constant voltage tank, cantilever bearing 202, cantilever 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, connect tight fixed bolt 209, straight shape bolt hole 371, expandable washer 372, locknut 373,

it is characterized in that: traced fluid storage bottle 1 bottom connection 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, intake chamber 4 and overflow groove 5 all are positioned at constant voltage tank 3 right sides, intake chamber 4 is against the right plate washer of constant voltage tank 3, overflow groove 5 is against intake chamber 4, intake chamber 4 tops are lower than overflow groove 5, overflow groove 5 tops are lower than constant voltage tank 3, and described intake chamber 4 and overflow groove 5 are wide, intake chamber 4 and overflow groove 5 width all＜width of overflow groove 5 right side plate washers;

Described spike pin clamping device 20 is identical two covers of shape scantling, and spike pin clamping device 20 is individually fixed in middle and upper part and the middle and lower part of constant voltage tank 3 left plate washers; (being used for fixedly spike pin 21) traced fluid stream guiding tube 22 connects spike pin neck 41, spike pin 21 is fixed on spike pin clamping device 20 by spike needle tubing card 205 and pipe clamp tight fixed bolt 206, spike pin mouth 44 is arranged in the experiment mouth of pipe 19, spike pin mouth 44 bottoms are lower than testing on the mouth of pipe 19 along surface level, spike pin 21 is concentric with the experiment mouth of pipe 19, experiment tube 18, (avoid the continuous overflow of fluid in constant voltage tank 3, the tracer agent that feeds through to by 44 ejections of spike pin mouth is affected) experiment mouth of pipe 19 connects experiment tube 18;

2, described reynolds test instrument is characterized in that: the described experiment mouth of pipe 19 is upper wealthy lower 45 ° of narrow oviducts, and the caliber of the caliber=experiment tube 18 at the bottom of oviduct connects experiment tube 18 at the bottom of the oviduct of the experiment mouth of pipe 19.

3, described reynolds test instrument, it is characterized in that: described spike pin 21, it is characterized in that: spike pin 21 is comprised of spike pin neck 41, spike needle tubing 42, spike needle tubing wall 43, spike pin mouth 44, spike pin neck 41 is the cylinder boss of thin-walled, (being used for connecting traced fluid stream guiding tube 22), spike needle tubing 42 is smooth straight shape cylindrical tube, and spike pin mouth 44 tops and spike pin main body are isometrical, the attenuation gradually of bottom tube wall, spike pin mouth 44 tube walls are bell.

Claims (2)

1. spike pin cantilever locating device, comprise spike pin clamping device, the left plate washer of constant voltage tank, cantilever bearing, cantilever, angle iron bracket, spike needle tubing card, pipe clamp tight fixed bolt, support tight fixed bolt, cantilever tight fixed bolt, connect tight fixed bolt, straight shape bolt hole, expandable washer, locknut; It is characterized in that: described spike pin clamping device is identical two covers of shape scantling, and spike pin clamping device is individually fixed in middle and upper part and the middle and lower part of the left plate washer of constant voltage tank;

The left plate washer of constant voltage tank is by connecting tight fixed bolt connecting cantilever bearing, the cantilever bearing is by cantilever tight fixed bolt connecting cantilever, cantilever is by support tight fixed bolt connecting angle iron support, and the spike pin fixes on angle iron bracket by pipe clamp tight fixed bolt and spike needle tubing.

2. spike pin cantilever locating device as claimed in claim 1, is characterized in that: have straight shape slotted hole, support tight fixed bolt to pass straight shape slotted hole on described cantilever and angle iron bracket is connected with cantilever with locknut by expandable washer.

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