CN111467722B - Fire-fighting sand blasting gun tube and design method of molded surface thereof - Google Patents
Fire-fighting sand blasting gun tube and design method of molded surface thereof Download PDFInfo
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- CN111467722B CN111467722B CN202010435400.0A CN202010435400A CN111467722B CN 111467722 B CN111467722 B CN 111467722B CN 202010435400 A CN202010435400 A CN 202010435400A CN 111467722 B CN111467722 B CN 111467722B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005488 sandblasting Methods 0.000 title claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 230000008602 contraction Effects 0.000 claims description 19
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001595 flow curve Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 4
- 244000035744 Hura crepitans Species 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/005—Delivery of fire-extinguishing material using nozzles
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Nozzles (AREA)
Abstract
The invention relates to a fire-fighting sand blasting gun barrel and a design method of a molded surface thereof, wherein the fire-fighting sand blasting gun barrel comprises a sand inlet pipe, an air inlet pipe, an outer pipe, an inner pipe and a connecting ring; the left end of the outer tube is closed, the right end of the outer tube is opened, the sand inlet tube is inserted and fixed at the left end of the outer tube and is concentrically arranged with the outer tube, one end of the air inlet tube is inserted and fixed at the left end of the outer tube and is mutually communicated with the inside of the outer tube, the inner tube is concentrically arranged in the outer tube, and the connecting ring is sleeved and fixed outside the inner tube and is embedded and fixed on the inner wall of the outer tube; the invention can mix gravel and air flow mutually and effectively avoid collision between the gravel and the pipe wall to prevent energy loss, thereby accelerating the air flow mixed with the gravel to supersonic speed to greatly enlarge the projection distance, enabling operators to rapidly spray the gravel to any position of a fire scene at a position far away from the fire scene, having high efficiency and long effective coverage distance and guaranteeing the life safety of the operators.
Description
Technical Field
The invention relates to a fire-fighting sand blasting gun barrel and a design method of a molded surface of the fire-fighting sand blasting gun barrel.
Background
Civil fire-fighting facilities such as fire extinguishers, fire belts, and sand boxes can cope with small-scale fires. However, in places such as chemical plants, power plants, chemical storage and transportation, the fire-extinguishing areas are large, and the fire-extinguishing materials are mostly toxic and harmful substances, so that the fire is usually extinguished by covering the surfaces with gravel; especially water-explosive chemicals, gravel coverage is the only effective means.
The existing gravel covering mode is that gravel is transported to a position closest to a fire scene through a vehicle, then the gravel is removed, and the gravel is shoveled by means of a manual work or a bulldozer.
Disclosure of Invention
Aiming at the current state of the art, the invention aims to provide a fire-fighting sand blasting gun barrel and a design method of a molded surface thereof, wherein the fire-fighting sand blasting gun barrel can accelerate the air flow mixed with gravel to supersonic speed to greatly enlarge the projection distance, has high efficiency and long effective coverage distance and can ensure the life safety of operators.
The technical scheme adopted for solving the technical problems is as follows: the fire-fighting sand blasting gun tube is characterized by comprising a sand inlet tube, an air inlet tube, an outer tube, an inner tube and a connecting ring; the left end of the outer tube is closed, the right end of the outer tube is opened, the sand inlet tube is inserted and fixed at the left end of the outer tube and is concentrically arranged with the outer tube, one end of the air inlet tube is inserted and fixed at the left end of the outer tube and is mutually communicated with the inside of the outer tube, one end of the sand inlet tube is provided with a first injection head, the first injection head is arranged inside the left end of the outer tube, the inner tube is concentrically arranged inside the outer tube, the connecting ring is sleeved and fixed outside the inner tube and is embedded and fixed on the inner wall of the outer tube, and the first injection head is inserted into the left end of the inner tube and forms a primary Laval tube with the left end inner wall of the inner tube; a plurality of air holes which are distributed along the circumferential direction at equal angles are formed in the connecting ring; the right end of the inner tube is provided with a second injection head, and an outer ring Laval pipe is formed between the second injection head and the inner wall of the outer tube; the inner wall of the middle part of the inner tube is outwards provided with a convex ring which is distributed in a circumferential direction, and a secondary Laval pipe is formed in the convex ring.
Preferably, a throat is formed between the primary Laval pipe and the maximum outer diameter of the first injection head, a primary contraction section and a primary expansion section are respectively formed on the left side and the right side of the throat, the sectional area of the primary contraction section continuously decreases from left to right, and the sectional area of the primary expansion section continuously increases from left to right.
Preferably, a first arc-shaped ring and a second arc-shaped ring which are distributed in a circumferential direction are respectively formed on the left side and the right side of the convex ring, a secondary contraction section is formed in the first arc-shaped ring, the sectional area of the secondary contraction section is continuously reduced from left to right, and the secondary contraction section is sleeved outside the first injection head and is communicated with the primary expansion section.
Preferably, the second arcuate ring has a secondary expansion section formed therein, the secondary expansion section having a cross-sectional area that continuously increases from left to right.
The design method of the fire-fighting sand blasting gun tube profile is characterized by comprising the following steps of:
step one, calculating the curvature of the inner wall of the primary contraction section according to a formula (1) to obtain a one-dimensional flow curve;
step two, dividing the primary expansion section and the secondary expansion section into 3 areas by adopting a Crfsci analysis method: an AODB region where the source flow is gradually formed, a BDEC region where the source flow is rectified to parallel uniform flow with the same mach number, a BFC section where the profile eliminates all expansion wave reflections on the wall;
step three, designing an AB section curve by adopting an experience curve of a Foelsch method;
determining the axial distribution of the BDEF zone according to the formula (2), and obtaining a speed distribution formula (3) of the DE section after conversion simplification;
and fifthly, determining the positions of the point D and the point E according to a formula (3), determining the position of a characteristic line endpoint C according to the characteristic line of the point E on the left side as a straight line, and solving the profile curve of the BC segment by taking BD, DE and EC as boundary conditions and utilizing the ternary characteristic linear theory and the mass conservation law.
Compared with the prior art, the invention has the advantages that: the invention can mix gravel and air flow mutually and effectively avoid collision between the gravel and the pipe wall to prevent energy loss, thereby accelerating the air flow mixed with the gravel to supersonic speed to greatly enlarge the projection distance, enabling operators to rapidly spray the gravel to any position of a fire scene at a position far away from the fire scene, having high efficiency and long effective coverage distance and guaranteeing the life safety of the operators.
Drawings
FIG. 1 is a cross-sectional structural view of the present invention;
FIG. 2 is a cross-sectional view of the primary Laval pipe of the present invention;
fig. 3 is a graph of the profile design of the primary and secondary laval tubes of the present invention.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present invention clear and concise, the detailed description of known functions and known components thereof have been omitted.
As shown in fig. 1 to 3, a fire-fighting sand blasting gun tube comprises a sand inlet tube 1, an air inlet tube 2, an outer tube 3, an inner tube 4 and a connecting ring 5; the left end of the outer tube 3 is closed, the right end of the outer tube 3 is opened, the sand inlet tube 1 is fixedly inserted into the left end of the outer tube 3 and is concentrically arranged with the outer tube 3, one end of the air inlet tube 2 is fixedly inserted into the left end of the outer tube 3 and is mutually communicated with the inside of the outer tube 3, a first injection head 11 is formed at one end of the sand inlet tube 1, the first injection head 11 is arranged in the left end of the outer tube 3, the inner tube 4 is concentrically arranged in the outer tube 3, the connecting ring 5 is fixedly sleeved outside the inner tube 4 and is fixedly embedded on the inner wall of the outer tube 3, and the first injection head 11 is inserted into the left end of the inner tube 4 and forms a primary Laval pipe 6 with the left end inner wall of the inner tube 4; the connecting ring 5 is provided with a plurality of air holes 51 distributed along the circumferential direction at equal angles; the right end of the inner tube 4 is provided with a second injection head 41, and an outer ring Laval pipe 7 is formed between the second injection head 41 and the inner wall of the outer tube 3; a convex ring 42 distributed in a circumferential direction is formed outwards on the inner wall of the middle part of the inner tube 4, and a secondary Laval pipe 8 is formed inside the convex ring 42.
A throat 62 is formed between the primary laval pipe 6 and the maximum outer diameter of the first spray head 11, and a primary contraction section 61 and a primary expansion section 63 are formed on the left and right sides of the throat 62, respectively, and the sectional area of the primary contraction section 61 is continuously decreased from left to right, and the sectional area of the primary expansion section 63 is continuously increased from left to right.
The left and right sides of bulge loop 42 are formed with first arc circle 43 and the second arc circle 44 that the hoop distributes respectively, and the inside of first arc circle 43 has formed secondary shrink section 81, and the cross-sectional area of secondary shrink section 81 reduces from left to right in succession, and secondary shrink section 81 cover is established in the outside of first injection head 11 and communicates each other with primary expansion section 63, and the inside of second arc circle 44 has formed secondary expansion section 82, and the cross-sectional area of secondary expansion section 82 increases from left to right in succession.
A design method of a fire-fighting sand blasting gun barrel profile comprises the following steps:
step one, calculating the curvature of the inner wall of the primary contraction section 61 according to the formula (1) to obtain a one-dimensional flow curve, see fig. 3;
in formula (1):
x is the transverse length anywhere from the entrance of the primary constriction 61;
d is the diameter at the entrance of the primary constriction 61;
dt is the diameter at the throat 62;
di is the cross-sectional diameter at x;
l: the length of the primary constriction 61.
Step two, the primary expansion section 63 and the secondary expansion section 82 are divided into 3 areas by using a Crfsci analysis method: an AODB region where the source flow is gradually formed, a BDEC region where the source flow is rectified to parallel uniform flow with the same mach number, a BFC section where the profile eliminates all expansion wave reflections on the wall, see fig. 3;
and step three, designing an AB-segment curve by adopting an empirical curve of a Foelsch method.
Determining axial distribution of the BDEF zone which is a partial wave-absorbing zone according to the formula (2), and obtaining a speed distribution formula (3) of the DE section after conversion and simplification;
where x= (x-x) D )/(x E -x D ) The boundary conditions satisfied by this third order polynomial are as follows:
select x E Substituting these boundary conditions into the first polynomial, the simplification yields:
and fifthly, determining the positions of the point D and the point E according to a formula (3), determining the position of a characteristic line endpoint C according to the characteristic line of the point E on the left side as a straight line, and solving the profile curve of the BC segment by taking BD, DE and EC as boundary conditions and utilizing the ternary characteristic linear theory and the mass conservation law.
When in use, compressed air enters the primary contraction section 61 of the primary Laval pipe 6 through the air inlet pipe 2, is accelerated to supersonic speed through the primary contraction section 61, and generates vacuum in the sand inlet pipe 1, the sand box is connected with the left end of the sand inlet pipe 1 through the steel wire framework hose, gravel in the sand box is sucked into the sand inlet pipe 1 under the vacuum action of the sand inlet pipe 1, and then enters the left end of the inner pipe 4, so that the sand box is mixed with supersonic airflow in the primary expansion section 63; then, the supersonic air flow mixed with the gravel flows rightward into the secondary contraction section 81, and is slowed down by the secondary contraction section 81, then enters the secondary expansion section 82 again to accelerate and be ejected outward from the right end of the inner tube 4; at the same time, the air flow entering the outer tube 3 enters the outer ring Laval pipe 7 through the plurality of air holes 51 in the connecting ring 5 and is accelerated to be higher than the sound velocity, and the supersonic air flow generated by the structure can prevent the sand sprayed from the right end of the inner tube 4 from impacting the inner wall of the outer tube 3 to cause energy loss, and meanwhile, the air-sand mixture is pushed to be further accelerated and finally sprayed from the right end of the outer tube 3.
The invention can mix gravel and air flow mutually and effectively avoid collision between the gravel and the pipe wall to prevent energy loss, thereby accelerating the air flow mixed with the gravel to supersonic speed to greatly enlarge the projection distance, enabling operators to rapidly spray the gravel to any position of a fire scene at a position far away from the fire scene, having high efficiency and long effective coverage distance and guaranteeing the life safety of the operators.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications may be made to the techniques described in the foregoing embodiments, or that certain features may be substituted for those illustrated therein; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The fire-fighting sand blasting gun tube is characterized by comprising a sand inlet tube, an air inlet tube, an outer tube, an inner tube and a connecting ring; the left end of the outer tube is closed, the right end of the outer tube is opened, the sand inlet tube is inserted and fixed at the left end of the outer tube and is concentrically arranged with the outer tube, one end of the air inlet tube is inserted and fixed at the left end of the outer tube and is mutually communicated with the inside of the outer tube, one end of the sand inlet tube is provided with a first injection head, the first injection head is arranged inside the left end of the outer tube, the inner tube is concentrically arranged inside the outer tube, the connecting ring is sleeved and fixed outside the inner tube and is embedded and fixed on the inner wall of the outer tube, and the first injection head is inserted into the left end of the inner tube and forms a primary Laval tube with the left end inner wall of the inner tube; a plurality of air holes which are distributed along the circumferential direction at equal angles are formed in the connecting ring; the right end of the inner tube is provided with a second injection head, and an outer ring Laval pipe is formed between the second injection head and the inner wall of the outer tube; the inner wall of the middle part of the inner tube is outwards provided with a convex ring which is distributed in a circumferential direction, a secondary Laval pipe is formed in the convex ring, a throat is formed between the primary Laval pipe and the position with the largest outer diameter of the first injection head, a primary contraction section and a primary expansion section are respectively formed on the left side and the right side of the throat, the sectional area of the primary contraction section is continuously reduced from left to right, and the sectional area of the primary expansion section is continuously increased from left to right.
2. The fire-fighting sand blasting gun tube according to claim 1, wherein a first arc-shaped ring and a second arc-shaped ring which are distributed in a circumferential direction are respectively formed on the left side and the right side of the convex ring, a secondary contraction section is formed in the first arc-shaped ring, the sectional area of the secondary contraction section is continuously reduced from left to right, and the secondary contraction section is sleeved outside the first injection head and is communicated with the primary expansion section.
3. A fire fighting sandblasted gun barrel according to claim 2, wherein the interior of the second arcuate collar forms a secondary expansion section, the cross-sectional area of the secondary expansion section continuously increasing from left to right.
4. A method of designing a fire-fighting sandblasted gun barrel profile according to claim 3, comprising the steps of:
step one, calculating the curvature of the inner wall of the primary contraction section according to a formula (1) to obtain a one-dimensional flow curve;
step two, dividing the primary expansion section and the secondary expansion section into 3 areas by adopting a Crfsci analysis method: an AODB region where the source flow is gradually formed, a BDEC region where the source flow is rectified to parallel uniform flow with the same mach number, a BFC section where the profile eliminates all expansion wave reflections on the wall;
step three, designing an AB section curve by adopting an experience curve of a Foelsch method;
determining the axial distribution of the BDEF zone according to the formula (2), and obtaining a speed distribution formula (3) of the DE section after conversion simplification;
and fifthly, determining the positions of the point D and the point E according to a formula (3), determining the position of a characteristic line endpoint C according to the characteristic line of the point E on the left side as a straight line, and solving the profile curve of the BC segment by taking BD, DE and EC as boundary conditions and utilizing the ternary characteristic linear theory and the mass conservation law.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435400.0A CN111467722B (en) | 2020-05-21 | 2020-05-21 | Fire-fighting sand blasting gun tube and design method of molded surface thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435400.0A CN111467722B (en) | 2020-05-21 | 2020-05-21 | Fire-fighting sand blasting gun tube and design method of molded surface thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111467722A CN111467722A (en) | 2020-07-31 |
| CN111467722B true CN111467722B (en) | 2023-07-04 |
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| CN202010435400.0A Active CN111467722B (en) | 2020-05-21 | 2020-05-21 | Fire-fighting sand blasting gun tube and design method of molded surface thereof |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982003348A1 (en) * | 1981-04-02 | 1982-10-14 | Koebel Alfons | Method and device for pneumatically compacting molding sand |
| US4730784A (en) * | 1986-02-25 | 1988-03-15 | Arbed S.A. | Oxygen blast nozzle |
| US5601478A (en) * | 1994-03-01 | 1997-02-11 | Job Industries Ltd. | Fluidized stream accelerator and pressuiser apparatus |
| RU2153939C1 (en) * | 1999-03-26 | 2000-08-10 | Шахтинский институт Южно-Российского государственного технического университета (НПИ) | Mortar applying nozzle |
| JP2008023459A (en) * | 2006-07-21 | 2008-02-07 | Takuma Co Ltd | Two-fluid spray nozzle |
| EP2574408A1 (en) * | 2011-09-30 | 2013-04-03 | Air Liquide Deutschland GmbH | Method and device for supplying a coolant media flow |
| CN105443088A (en) * | 2016-01-14 | 2016-03-30 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Low-pressure gas well two-fluid supersonic atomization drainage gas recovery system and process thereof |
| CN107185765A (en) * | 2017-05-04 | 2017-09-22 | 江苏大学 | A kind of band can bumpy flow impeller ladder cavate low-frequency ultrasonic atomizing shower nozzle |
| CN108165923A (en) * | 2018-03-07 | 2018-06-15 | 水利部杭州机械设计研究所 | A kind of preparation process of the high enthalpy plasma gun of novel super-high velocity of sound and WC base composite coatings |
| CN212631523U (en) * | 2020-05-21 | 2021-03-02 | 南京湛泸科技有限公司 | Fire control sandblast barrel |
-
2020
- 2020-05-21 CN CN202010435400.0A patent/CN111467722B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982003348A1 (en) * | 1981-04-02 | 1982-10-14 | Koebel Alfons | Method and device for pneumatically compacting molding sand |
| US4730784A (en) * | 1986-02-25 | 1988-03-15 | Arbed S.A. | Oxygen blast nozzle |
| US5601478A (en) * | 1994-03-01 | 1997-02-11 | Job Industries Ltd. | Fluidized stream accelerator and pressuiser apparatus |
| RU2153939C1 (en) * | 1999-03-26 | 2000-08-10 | Шахтинский институт Южно-Российского государственного технического университета (НПИ) | Mortar applying nozzle |
| JP2008023459A (en) * | 2006-07-21 | 2008-02-07 | Takuma Co Ltd | Two-fluid spray nozzle |
| EP2574408A1 (en) * | 2011-09-30 | 2013-04-03 | Air Liquide Deutschland GmbH | Method and device for supplying a coolant media flow |
| CN105443088A (en) * | 2016-01-14 | 2016-03-30 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Low-pressure gas well two-fluid supersonic atomization drainage gas recovery system and process thereof |
| CN107185765A (en) * | 2017-05-04 | 2017-09-22 | 江苏大学 | A kind of band can bumpy flow impeller ladder cavate low-frequency ultrasonic atomizing shower nozzle |
| CN108165923A (en) * | 2018-03-07 | 2018-06-15 | 水利部杭州机械设计研究所 | A kind of preparation process of the high enthalpy plasma gun of novel super-high velocity of sound and WC base composite coatings |
| CN212631523U (en) * | 2020-05-21 | 2021-03-02 | 南京湛泸科技有限公司 | Fire control sandblast barrel |
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| CN111467722A (en) | 2020-07-31 |
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