CN109975473A - A kind of electronic needle of shock tube that can be used under lower pressure punctures film device - Google Patents
A kind of electronic needle of shock tube that can be used under lower pressure punctures film device Download PDFInfo
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- CN109975473A CN109975473A CN201910215018.6A CN201910215018A CN109975473A CN 109975473 A CN109975473 A CN 109975473A CN 201910215018 A CN201910215018 A CN 201910215018A CN 109975473 A CN109975473 A CN 109975473A
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- needle
- shock tube
- pricker
- sleeve
- film device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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Abstract
The present invention relates to combustion experiment technical fields, it is desirable to provide a kind of electronic needle of shock tube that can be used under lower pressure punctures film device.Its micromotor is fixedly mounted on the inner wall of shock tube by motor base, and motor screw is parallel to shock tube axis and threaded；The needle thorn sleeve of hollow tubular has open end and closing tail end, and pricker is mounted on tail end；Needle thorn sleeve be internally threaded or rack gear along its length, be sleeved in motor screw and make screw thread or rack gear to engage with the screw thread of motor screw from open end；The outside that needle pierces sleeve is equipped with the laterally protruding portion with through-hole, and the guide rod for being parallel to needle thorn sleeve passes through the through-hole, and one end of which is fixed on micromotor.By using automatically controlled control, than common mechanical needle to puncture film mechanism fast and uniformly for the needle speed that goes out of pricker, it is easier to control the correct time of rupture of membranes.Convenient, easy sealing that pricker is replaced, universal performance are strong, can perform well in lower pressure, reliable efficient, reproducible.
Description
Technical field
The invention belongs to combustion experiment technical fields, are related to a kind of electronic needle thorn of the shock tube that can be used under lower pressure
Film breaking unit.
Background technique
Hydrocarbon fuel source is extensive, and energy density is high, and the most widely used fuel of aviation aircraft at present, hydrocarbon combustion
The firing characteristic of material is related to the energy release rule and kinetics of combustion research of fuel, is the related neck such as aero-engine research
One of the hot spot in domain.Ignition delay time is the important characterization of hydrocarbon fuel combustion characteristic, and verifying combustion reaction chemistry is dynamic
The important evidence of mechanical model and simplified model.In actual engineer application, the ignition delay time of fuel is rushed as super burn
One of hydraulic motor and the important parameter of pulse detonation engine Combustion chamber design, in engine combustion room working condition and
The design and performance of engine have vital influence.Fuel combustion generally requires experience igniting, flame propagation and fire
Flame stablizes these significant process, and the ignition delay time of hydrocarbon fuel is extremely short, generally millisecond magnitude, therefore, how to measure
The ignition delay time of hydrocarbon fuel is extremely important.
Currently, experimental study or the major experimental equipment for measuring hydrocarbon fuel ignition delay time are shock tubes.Shock tube
It is the experimental facilities for being uniformly insulated non-isentropic Compression to substance by incident shock and reflected shock wave, since shock tube has
Structure is simple, easy to use, can provide the experiment parameter of wider range, therefore shock tube is in the basic research such as physics, chemistry
It has a wide range of applications.It is especially all extensive in fields such as aerodynamics, other physical, chemical kinetics and aero-acousticses
The experimental study of fuel ignition is carried out using shock tube.
Rupture of membranes is shock tube experiment process most significant steps, is directly related to the success or not of experiment and the precision of experiment.
Since the fuel pressure operating condition difference for needing to measure is larger, used rupture of membranes mode and diaphragm in shock tube experiment design
It can be changed according to the difference of reaction pressure.Especially under the reaction condition of low pressure, due to shock tube high-low pressure pressure at two ends
Difference is smaller, increases the difficulty of rupture of membranes and makes the reduction of rupture of membranes success rate, needs to carry out rupture of membranes by external force, therefore, for low pressure
Shock tube experiment is carried out under environment, chooses suitable film breaking unit and mode is particularly significant.
Current existing film breaking unit the problem is that: (1) electric heating rupture of membranes is inefficient, there are it is higher can not rupture of membranes
Probability.(2) it is difficult to control accurately Rupture of Membrane pressure using the autonomous rupture of membranes of high pressure, can not accurately realizes the control of experiment condition.(3)
Traditional needle punctures film and goes out that needle speed is not high, when the pressure of shock tube drive section is relatively high, the sealing problem and needle of drive section
Thorn speed will affect the quality of air-flow and the consistency of shock velocity.
Summary of the invention
The technical problem to be solved by the present invention is to, overcome deficiency in the prior art, provide it is a kind of can be under lower pressure
The electronic needle of the shock tube used punctures film device.
In order to solve the technical problem, solution of the invention is:
A kind of electronic needle of shock tube that can be used under lower pressure is provided and punctures film device, including for puncturing shock tube
Pricker, motor base, micromotor, motor screw, needle thorn sleeve and the guide rod of diaphragm；Micromotor is solid by motor base
On the inner wall of shock tube, output end is equipped with the threaded motor screw for being parallel to shock tube axis for Dingan County；Hollow tube
The needle thorn sleeve of shape has open end and closing tail end, and the pricker is mounted on tail end；Needle thorn sleeve be internally threaded or
Rack gear along its length is sleeved in motor screw from open end and makes the screw thread of screw thread or rack gear and motor screw to nibble
It closes；The outside that needle pierces sleeve is equipped with the laterally protruding portion with through-hole, and the guide rod for being parallel to needle thorn sleeve passes through the through-hole, and its
One end is fixed on micromotor.
In the present invention, the power supply line of micromotor is being passed through after the sealing element on shock tube tube body, external with connecting
The control switch of power supply connects.
It in the present invention, is bolted between micromotor and motor base, motor base is fixed on welding manner
On the inner wall of shock tube.
In the present invention, pricker includes pricker pedestal and pricker sword, the faller gill that wherein pricker sword is fixed by two right-angled intersections
Composition；Pricker pedestal is connected through a screw thread the tail end that mode is mounted on needle thorn sleeve.
In the present invention, laterally protruding portion is set on the outside of the open end of needle thorn sleeve.
In the present invention, flange is fixedly installed in the end of shock tube, and diaphragm is installed in by the mode being bolted
Between two flanges.
In the present invention, corresponding concaveconvex structure is respectively set on two flange faces, for being accurately positioned and clamping diaphragm.
In the present invention, sealing ring is equipped between two flange faces.
Compared with prior art, the beneficial effects of the present invention are:
1, the electronic needle of shock tube punctures film device using automatically controlled control, and the needle speed that goes out of pricker is pierced than common mechanical needle
Rupture of membranes mechanism is fast and uniform, it is easier to control the correct time of rupture of membranes.
2, pricker replacement is convenient, and the pricker of different length and different materials can be arranged according to diaphragm type difference.
3, needling device and external connection only have a conducting wire, are easy to be sealed, and keep whole device and shock tube
Preferable air-tightness.
4, universal performance is strong.Change motor base size, tube body and is applicable to different sizes from the size of mating flange
Shock tube.
5, lower pressure can be performed well in, it is reliable efficient, reproducible.
6, it is applicable to the shock tube and experiment condition of diversified forms, there is stronger versatility.
Detailed description of the invention
Fig. 1 is that electronic needle punctures installation diagram of the film device in shock tube；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the sectional view that electronic needle punctures film device；
Fig. 4 is the side view of Fig. 3；
Fig. 5 is the sectional view for pressing from both sides the mating flange of film；
Fig. 6 is the side view of Fig. 5.
Appended drawing reference in figure: shock tube 1, flange 2, bolt 3, diaphragm 4, power supply line 5, sealing element 6, control switch 7, electricity
Machine base 8, micromotor 9, motor screw 10, needle pierce sleeve 11, guide rod 12, pricker 13.
Specific embodiment
With reference to the accompanying drawing, film device is punctured to the electronic needle of shock tube of the present invention to be described in detail.
The electronic needle of shock tube puncture film device include motor base 8, micromotor 9, motor screw 10, needle thorn sleeve 11,
Guide rod 12 and pricker 13；Micromotor 9 is fixedly mounted on the inner wall of shock tube 1 by motor base 8, micromotor 9
Output end is equipped with the motor screw 10 for being parallel to 1 axis of shock tube, and screw thread is arranged in the surface of motor screw 10.Needle pierces sleeve 11
Hollow tubular, has open end and closing tail end, and pricker 13 is mounted on its tail end；Pricker 13 includes pricker pedestal and pricker sword,
Wherein pricker sword is made of the fixed faller gill of two right-angled intersections；Pricker pedestal is connected through a screw thread mode and is mounted on needle thorn sleeve
11 tail end.The length of pricker 13, material can be modified according to the material of institute's rupture of membranes piece 4, and the tip of pricker 13 is ground by angle
Machine is polished, rupture of membranes effect is better achieved.
Needle thorn sleeve 11 be internally threaded or rack gear along its length, be sleeved on motor screw from its open end
On 10 and engage screw thread or rack gear and the screw thread of motor screw 10；Needle, which pierces, is equipped with the cross with through-hole on the outside of the open end of sleeve 11
To protrusion, the guide rod 12 for being parallel to needle thorn sleeve 11 passes through the through-hole, and one end of which is fixed on micromotor 9.
Sealing element 6 with through hole is set on the tube body of shock tube 1, and the power supply line of micromotor 9 is passing through sealing element 6
Connect after through hole with control switch, control switch is connected to external power supply.Pass through spiral shell between micromotor 9 and motor base 8
Bolt is fixed, and motor base 8 is fixed on the inner wall of shock tube 1 with welding manner.
Shock tube 1 end be fixedly installed flange 2, and by bolt 3 diaphragm 4 is clamped be fixed on two flanges 2 it
Between.To guarantee sealing effect, corresponding concaveconvex structure can be respectively set on the face of two flanges 2, for being accurately positioned simultaneously
Diaphragm 4 is clamped, sealing ring is set between two flanges 2, achievees the effect that airtight.4 surface of diaphragm can spreading glue as needed, make
Diaphragm 4 is obtained to be bonded more preferably with the male and fomale(M&F) of flange 2.The material of flange 2 and bolt 3 is chosen as 304 stainless steels, and diaphragm 4 is optional
For bidirectional stretching polypropylene film.
When in use, positive control switch is pressed, the rotation of 9 driving motor screw rod 10 of micromotor passes through the screw thread of engagement
Or rack gear is further driven to needle thorn sleeve 11 and quickly releases forward, advance is punctured diaphragm by the pricker 13 of needle thorn 11 tail end of sleeve.
After rupture of membranes, pressing Reverse Turning Control switch rotates backward motor screw 10, and needle thorn sleeve 11 and pricker 13 is driven to return to original position.Peace
Ensure that motor screw 10, the direction of needle thorn sleeve 11 are parallel with 1 axis of shock tube when dress, makes the direction of travel and diaphragm of pricker 13
4 keep vertical.
Motor base 8 is welded on 1 inner wall of shock tube, and bolt can be used between micromotor 9 and motor base 8 and consolidated
Fixed, power supply line is pierced by from the sealing element 6 being fixed on 1 tube body of shock tube, is then connect with control switch 7.It can be in tube wall
Outer joint face processing groove simultaneously installs sealing element 6, and blend compounds water and sealing ring are sealed.Motor base 8 and motor screw
10 material is chosen as 304 stainless steels, and needle thorn 11 material of sleeve is chosen as H62 brass.
Micromotor 9 of the present invention is straight line screw rod stepper motor, very much (such as the Shenzhen's Chinese morals of optional product type
Protect the 11-3405-X type product of electromechanical Co., Ltd's production).The needle punctures film device and carries out electronic control by micromotor 9
System, control is more accurate, and the stretching speed of pricker 13 is fast stablized.Various plastic foils, paper membrane, metal film etc. can be punctured, low
Press rupture of membranes success rate height, effect under operating condition ideal.
Although shown describe the embodiment of the present invention, for the ordinary skill in the art, Ke Yili
Solution without departing from the principles and spirit of the present invention can to these embodiments carry out it is a variety of variation, modification, replacement and
Modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of electronic needle of shock tube that can be used under lower pressure punctures film device, including for puncturing shock tube diaphragm
Pricker；It is characterized in that, the device further includes motor base, micromotor, motor screw, needle thorn sleeve and guide rod；It is miniature
Motor is fixedly mounted on the inner wall of shock tube by motor base, and output end is equipped with and is parallel to the threaded of shock tube axis
Motor screw；The needle thorn sleeve of hollow tubular has open end and closing tail end, and the pricker is mounted on tail end；Needle pierces sleeve
Be internally threaded or rack gear along its length, screw thread or rack gear and electricity are sleeved in motor screw and made from open end
The engagement of machine screw flight；The outside that needle pierces sleeve is equipped with the laterally protruding portion with through-hole, is parallel to the guide rod of needle thorn sleeve
Across the through-hole, and one end of which is fixed on micromotor.
2. the electronic needle of shock tube according to claim 1 punctures film device, which is characterized in that the power supply line of micromotor exists
After the sealing element being set on shock tube tube body, connect with the control switch for connecting external power supply.
3. the electronic needle of shock tube according to claim 1 punctures film device, which is characterized in that micromotor and motor base
Between be bolted, motor base is fixed on the inner wall of shock tube with welding manner.
4. the electronic needle of shock tube according to claim 1 punctures film device, which is characterized in that pricker include pricker pedestal and
Pricker sword, wherein pricker sword is made of the fixed faller gill of two right-angled intersections；Pricker pedestal is connected through a screw thread mode and is mounted on
The tail end of needle thorn sleeve.
5. the electronic needle of shock tube according to claim 1 punctures film device, which is characterized in that laterally protruding portion is pierced set on needle
On the outside of the open end of sleeve.
6. puncturing film device to the electronic needle of shock tube described in 5 any one according to claim 1, which is characterized in that swashing
Flange is fixedly installed in the end of wave duct, and diaphragm is installed between two flanges by the mode being bolted.
7. the electronic needle of shock tube according to claim 6 punctures film device, which is characterized in that on two flange faces respectively
Corresponding concaveconvex structure is set, for being accurately positioned and clamping diaphragm.
8. the electronic needle of shock tube according to claim 6 punctures film device, which is characterized in that set between two flange faces
There is sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215018.6A CN109975473A (en) | 2019-03-20 | 2019-03-20 | A kind of electronic needle of shock tube that can be used under lower pressure punctures film device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215018.6A CN109975473A (en) | 2019-03-20 | 2019-03-20 | A kind of electronic needle of shock tube that can be used under lower pressure punctures film device |
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| CN109975473A true CN109975473A (en) | 2019-07-05 |
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| CN201910215018.6A Pending CN109975473A (en) | 2019-03-20 | 2019-03-20 | A kind of electronic needle of shock tube that can be used under lower pressure punctures film device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307960A (en) * | 2019-07-15 | 2019-10-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of shock tube active film breaking unit |
| CN111920543A (en) * | 2020-08-14 | 2020-11-13 | 中国人民解放军陆军特色医学中心 | Shock tube experimental device for simulating animal chest impact injury |
| CN112578073A (en) * | 2019-09-29 | 2021-03-30 | 中国石油化工股份有限公司 | Experimental device for survey gaseous spontaneous combustion induction time |
| CN112683541A (en) * | 2020-11-23 | 2021-04-20 | 武汉理工大学 | Visualization system for shock tube experimental device |
| CN113092050A (en) * | 2021-04-06 | 2021-07-09 | 北京理工大学 | Low-resistance active membrane breaking device for shock tube |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307960A (en) * | 2019-07-15 | 2019-10-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of shock tube active film breaking unit |
| CN110307960B (en) * | 2019-07-15 | 2021-06-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | Active membrane breaking device for shock tube |
| CN112578073A (en) * | 2019-09-29 | 2021-03-30 | 中国石油化工股份有限公司 | Experimental device for survey gaseous spontaneous combustion induction time |
| CN111920543A (en) * | 2020-08-14 | 2020-11-13 | 中国人民解放军陆军特色医学中心 | Shock tube experimental device for simulating animal chest impact injury |
| CN112683541A (en) * | 2020-11-23 | 2021-04-20 | 武汉理工大学 | Visualization system for shock tube experimental device |
| CN112683541B (en) * | 2020-11-23 | 2023-02-28 | 武汉理工大学 | Visualization system for shock tube experimental device |
| CN113092050A (en) * | 2021-04-06 | 2021-07-09 | 北京理工大学 | Low-resistance active membrane breaking device for shock tube |
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