KR101796484B1 - Diaphragmless shock tube using a free piston system - Google Patents
Diaphragmless shock tube using a free piston system Download PDFInfo
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- KR101796484B1 KR101796484B1 KR1020160021628A KR20160021628A KR101796484B1 KR 101796484 B1 KR101796484 B1 KR 101796484B1 KR 1020160021628 A KR1020160021628 A KR 1020160021628A KR 20160021628 A KR20160021628 A KR 20160021628A KR 101796484 B1 KR101796484 B1 KR 101796484B1
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- chamber
- pressure chamber
- leak
- free piston
- pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/08—Application of shock waves for chemical reactions or for modifying the crystal structure of substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L99/00—Subject matter not provided for in other groups of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Clinical Laboratory Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
Abstract
A non-diaphragm shockwave tube using a free piston,
A high-pressure chamber in a closed form; A low pressure chamber having one end inserted into the interior of the high pressure chamber; A leak chamber provided at an inner side of the high pressure chamber; And a free piston which is installed inside the leak chamber so as to be movable in the left and right direction to open and close the tip of the low pressure chamber
It is possible to carry out the repetitive shock wave experiment easily while reducing the time and manpower required for the experiment preparation such as the diaphragm replacement and the like without generating debris or debris in the shock wave generation process.
Description
The present invention relates to a seam-free shockwave tube using a free piston, and more particularly, to a seawater shockwave tube that uses a free piston to open a low-pressure chamber through an opening / closing rubber that expands or shrinks according to a pressure of a gas filled in a leak chamber, So that repeated experiments can be performed without replacement of the diaphragm.
Fig. 1 is a schematic view of a general shock wave tube, and Fig. 2 is an example of a membrane of a diaphragm.
Generally, as shown in FIG. 1, the
The shock wave tube (10) is an apparatus that obtains shock waves in a low pressure tube through an instantaneous flow generated by a diaphragm (13).
The
The shock wave generated by the membrane of the
When these waves propagate inside the tube and are reflected at the closed end of the tube or the open end of the pipe, a very complex flow occurs.
On the other hand, since the shock wave obtained by the shock wave tube is accompanied by an instantaneous pressure and a temperature rise and propagates at a very high speed, there is a demand in recent years for an industrial demand which utilizes such a characteristic.
In the engineering applications of the shockwave tube, the strength (pressure rise) and propagation speed of the shock wave are mainly determined by the pressure ratio of the high-pressure chamber and the low-pressure chamber and the thickness of the material of the diaphragm. Therefore, So that it can be easily obtained.
The diaphragm material is made of cellophane or synthetic vinyl which is very thin to generate a weak shock wave when the working pressure ratio of the shock wave tube is low, and copper plate or iron plate may be used to generate a very strong shock wave.
As shown in Fig. 2, the diaphragm of such a diaphragm has a form such as a natural diaphragm due to a pressure difference between a high pressure plate and a low pressure plate of a shock wave tube and a forced diaphragm due to a needle or the like from the outside.
Fig. 2 (a) shows the state of the natural wave film, and Fig. 2 (b) shows the wave film by the declination.
The most important problems encountered in the application of most shockwave tubes are the problem of reproducibility of the shock wave tube process and contamination by debris or debris generated during the wave process.
FIG. 3 is a view showing debris or debris generated in the process of rupturing.
Generally, even if the pressure ratio of the shock wave tube is the same, the details of the wave propagation process will vary depending on the experiment, and it is very difficult to precisely control the wave propagation process.
In addition, debris such as debris from faults is generated, which is an important technical problem to be solved in the engineering application of the shock wave tube.
Therefore, it is troublesome to carry out new experiment after cleaning up such pollutants. Moreover, since the diaphragm can not be regenerated after the membrane, it is necessary to replace it with a new diaphragm material every time. It is becoming a limiting factor.
The following Patent Document 1 discloses an improved shock tube structure.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and its object is to prevent generation of debris or debris in the shock wave generation process by generating a shock wave by opening a low pressure chamber through a free piston without breaking the diaphragm The present invention is to provide a seam-free shock-absorbing tube using a free piston, which enables a repetitive shock wave experiment to be performed more easily while reducing the time and manpower required for preparation of experiments such as diaphragm replacement.
In order to accomplish the above object, according to the present invention, there is provided a zero-diaphragm shock wave tube using a free piston, comprising: a high-pressure chamber in a closed form; A low pressure chamber having one end inserted into the interior of the high pressure chamber; A leak chamber provided at an inner side of the high pressure chamber; And a free piston which is installed inside the leak chamber so as to be movable in the left and right direction to open and close the tip of the low pressure chamber.
The non-diaphragm shockwave pipe using the free piston according to the present invention comprises: an auxiliary chamber provided at one side of the leak chamber to receive gas discharged from the leak chamber; And an auxiliary piston movably installed in the interior of the auxiliary chamber so as to open and close an exhaust hole provided at one side of the leak chamber.
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The non-diaphragm shockwave pipe using the free piston according to the present invention is characterized by including a release chamber provided at one side of the auxiliary chamber and pressing the auxiliary piston.
The unshielded shockwave tube using the free piston according to the present invention is characterized in that an instantaneous opening / closing valve is installed in the release chamber.
The pressureless diaphragm shock tube using the free piston according to the present invention is characterized in that the pressure of the filled gas in the release chamber is set to be greater than the pressure of the gas filled in the leak chamber.
The non-diaphragm shockwave pipe using the free piston according to the present invention is characterized in that an induction slope is provided at the tip of the low pressure chamber.
According to the present invention, the shock wave can be generated more accurately, and the shock wave propagates to the low-pressure chamber, so that no debris or debris is generated due to the wave.
Therefore, according to the present invention, since the diaphragm does not need to be replaced, the time required for the preparation of the experiment can be greatly reduced by using the free-piston diaphragm shock tube using the free piston.
Further, according to the seawater-free shock wave tube using the free piston according to the present invention, it is possible to repeatedly perform the shock wave experiment by reusing the high-pressure chamber and the low-pressure chamber.
In addition, according to the present invention, the flow generated during the flow of the gas in the high-pressure chamber into the low-pressure chamber can be reduced, and the reproducibility of the shock wave generated in the low- .
1 is a structural view of a general shock wave tube,
Fig. 2 is an example of a membrane of a diaphragm,
FIG. 3 is a view showing debris or debris generated in the process of membrane breaking,
FIG. 4 is a schematic view of a seawall-free shock wave tube using a free piston according to a preferred embodiment of the present invention. FIG.
FIG. 5 is a longitudinal sectional view showing a main part of a seam-free shock-wave tube using a free piston according to another embodiment of the present invention. FIG.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown.
In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.
FIG. 4 is a view illustrating the construction of a seam-free shock-wave tube using a free piston according to a preferred embodiment of the present invention.
The
The high-
The low-
The
The
The
An
The
The
The
The auxiliary piston 160 opens and closes the
The
The
In the seawall-
Accordingly, the
The pressure Ps1 of the gas filled in the
The auxiliary piston 160 installed in the
The instantaneous on-off
When the internal pressure of the
When the
When the internal pressure of the
As described above, according to the preferred embodiment of the present invention, the
Accordingly, the low-
In addition, since it is not necessary to replace the diaphragm, the time required for preparing the experiment can be greatly reduced, and the high-
5 is a vertical cross-sectional view of a main part of a seam-free shock wave tube using a free piston according to another embodiment of the present invention.
5, the
The
In FIG. 5,
Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.
100: No-seawater shock wave tube
110: high pressure chamber
120: Low pressure chamber
130: leak chamber
140: Free piston
150: auxiliary chamber
160: auxiliary piston
Claims (8)
A low pressure chamber (120) having one end inserted into the high pressure chamber (110);
A leak chamber 130 provided at one side of the interior of the high pressure chamber 110;
A free piston 140 installed in the leak chamber 130 so as to be movable in the left and right direction to open and close the tip of the low pressure chamber 120;
An auxiliary chamber 150 provided at one side of the leak chamber 130 to receive gas discharged from the leak chamber 130;
And an auxiliary piston 160 installed in the auxiliary chamber 150 so as to be movable in the left and right direction to open and close an exhaust hole 131 provided at one side of the leak chamber 131,
And a release chamber (170) provided at one side of the auxiliary chamber (150) to press the auxiliary piston (160).
Wherein the release chamber (170) is provided with an instantaneous opening / closing valve (180) for releasing the gas filled in the release chamber (170) to the outside.
Wherein the pressure Ps1 of the gas filled in the release chamber 170 is set to be larger than the pressure Ps2 of the gas filled in the leak chamber 130. The free-
A low pressure chamber (120) having one end inserted into the high pressure chamber (110);
A leak chamber 130 provided at one side of the interior of the high pressure chamber 110;
And a free piston 140 installed in the leak chamber 130 so as to be movable in the left and right direction to open and close the tip of the low pressure chamber 120,
Characterized in that the induction slope part (121) is provided at the tip end of the low pressure chamber (120).
Priority Applications (1)
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KR1020160021628A KR101796484B1 (en) | 2016-02-24 | 2016-02-24 | Diaphragmless shock tube using a free piston system |
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KR1020160021628A KR101796484B1 (en) | 2016-02-24 | 2016-02-24 | Diaphragmless shock tube using a free piston system |
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KR20170099502A KR20170099502A (en) | 2017-09-01 |
KR101796484B1 true KR101796484B1 (en) | 2017-11-10 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102266227B1 (en) | 2020-10-22 | 2021-06-17 | (주)대주기계 | Hydrogen gas generation device by shock wave |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111195506B (en) * | 2020-01-21 | 2021-01-15 | 成都奇点无限科技有限公司 | Detonation type synthesizer |
CN113468832B (en) * | 2021-08-02 | 2023-02-24 | 中国空气动力研究与发展中心超高速空气动力研究所 | Two-dimensional simulation method for shock tube diaphragm rupture process based on overlapped moving grids |
CN115155681B (en) * | 2022-06-30 | 2023-09-05 | 天津大学 | Membraneless Shock Tube and Sampling System |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7104226B2 (en) | 2018-05-31 | 2022-07-20 | 大王製紙株式会社 | Tissue paper packaging |
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2016
- 2016-02-24 KR KR1020160021628A patent/KR101796484B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7104226B2 (en) | 2018-05-31 | 2022-07-20 | 大王製紙株式会社 | Tissue paper packaging |
Non-Patent Citations (1)
Title |
---|
Shock Waves, 2015, vol. 25, pp. 635~650 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102266227B1 (en) | 2020-10-22 | 2021-06-17 | (주)대주기계 | Hydrogen gas generation device by shock wave |
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KR20170099502A (en) | 2017-09-01 |
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