CN112589694B - Pure water cavitation jet impact strengthening nozzle - Google Patents
Pure water cavitation jet impact strengthening nozzle Download PDFInfo
- Publication number
- CN112589694B CN112589694B CN202011460234.6A CN202011460234A CN112589694B CN 112589694 B CN112589694 B CN 112589694B CN 202011460234 A CN202011460234 A CN 202011460234A CN 112589694 B CN112589694 B CN 112589694B
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- Prior art keywords
- cavity
- throat
- incidence
- pure water
- resonance
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000005728 strengthening Methods 0.000 title claims abstract description 32
- 239000011664 nicotinic acid Substances 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000005480 shot peening Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 1
- 229910000553 6063 aluminium alloy Inorganic materials 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003592 biomimetic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nozzles (AREA)
Abstract
The invention relates to a pure water cavitation jet impact strengthening nozzle, which comprises: the internal cavity is communicated with the incident part, the resonance part and the throat pipe in sequence along the axial direction; the utility model discloses a high-efficiency gas jet device, including the incident portion, the resonance portion, be equipped with on the incident portion, be equipped with entrance and at least one gaseous jet hole of intercommunication incident portion inner chamber and external on the incident portion, the inner wall of resonance portion is equipped with bionic structure, be equipped with the export of intercommunication venturi inner chamber and external on the venturi. According to the pure water cavitation jet impact strengthening nozzle, the bionic structure is arranged on the inner wall of the resonance part, and the resonance part is arranged to be of a necking structure, so that the cavitation rate can be greatly improved; by enabling the throat to comprise the expansion cavity with the variable diameter, the cavitation influence area can be effectively reduced, and therefore the cavitation effect is better.
Description
Technical Field
The invention relates to the field of material surface strengthening, in particular to a pure water cavitation jet impact strengthening nozzle.
Background
With the rapid development of modern industry, the requirements on the surface quality, the fatigue life and the like of parts are continuously improved, and the surface strengthening technology plays an increasingly important role in the industries of modern aerospace, weapons, ships and the like. The shot peening technology, which is a surface processing technology capable of effectively improving the strength and fatigue life of materials, has wide development prospect. The traditional shot peening process has the characteristics of high quality, high efficiency, low cost and the like, and is still the main method for strengthening the metal surface at the present stage. However, in recent years, the shapes of parts in industrial production are more complex, the requirements for fatigue resistance are continuously increasing, and the importance of environmental protection is gradually realized, so that the traditional mechanical shot peening technology needs to be further perfected. In recent years, with the appearance of novel surface strengthening technologies such as ultrasonic peening technology, laser peening technology, high-pressure water peening technology and cavitation water peening technology, the application range of the peening technology is greatly expanded.
Cavitation Water jet (Water-jet cavitation peening, WCP for short, cavitation shotless peening for international mention, CSP for short) was found at the end of the 60 s at the earliest, and cavitation was introduced into the Water jet by Kohl R E with the concomitant intensive study of cavitation. Cavitation in water flow and cavitation damage caused by air are harmful to hydraulic machinery, hydraulic components, hydraulic buildings and the like. Cavitation attracts attention from the end of the last century to before and after the first world war, and all research efforts have been aimed at preventing cavitation generation or reducing cavitation noise and cavitation damage. With the rapid development of ultrasonic physics and ultrasonic engineering, ultrasonic cleaning has emerged. This is essentially a cavitation water jet cleaning process. Ultrasonic drilling of small holes in hard materials is essentially a technique of drilling by oscillating cavitation jet, and the working medium is not pure water (oil) but an abrasive composed of silicon carbide and water (or oil). In addition, most erosion and abrasion material testing machines belong to the technical field of cavitation water jet. Therefore, when the high-pressure water jet cleaning technology and the cutting technology are raised, some students quickly combine cavitation erosion principle with water jet generation principle to propose cavitation water jet in various forms.
The pure water cavitation jet impact strengthening technology has the advantages of environmental protection, strong controllability, good strengthening effect and the like, and is used as one of the surface modification technologies with development prospects at present. In the pure water cavitation jet strengthening process, water jets flow through and cavitation in a nozzle and are sprayed out of the nozzle, so that surface strengthening is realized.
However, the existing nozzle has low cavitation rate and large cavitation influence area, and also brings unexpected influence to non-reinforced areas, thereby influencing the surface reinforcing effect.
Disclosure of Invention
The invention provides a pure water cavitation jet impact strengthening nozzle, which is used for improving the cavitation rate and reducing the cavitation influence area so as to improve the surface strengthening effect.
The invention provides a pure water cavitation jet impact strengthening nozzle, which comprises:
the internal cavity is communicated with the incident part, the resonance part and the throat pipe in sequence along the axial direction;
the utility model discloses a high-efficiency gas jet device, including the incident portion, the resonance portion, be equipped with on the incident portion, be equipped with entrance and at least one gaseous jet hole of intercommunication incident portion inner chamber and external on the incident portion, the inner wall of resonance portion is equipped with bionic structure, be equipped with the export of intercommunication venturi inner chamber and external on the venturi.
Further, the bionic structure is a clam skin structure.
Further, the throat pipe comprises an inlet part and an expansion part which are communicated, the inlet part is communicated with the resonance part, and the expansion part is a variable-diameter cavity.
Further, the expansion part is ellipsoidal.
Further, the inlet part of the throat pipe is a hollow cylinder.
Further, the inner diameter of the resonance portion gradually decreases from the end connected to the incident portion to the end connected to the throat.
Further, the resonance portion is hyperbolic.
Further, the incident part is a hollow cylinder.
Further, the gas jet holes are positioned on the side wall of the incidence part and are uniformly arranged along the circumferential direction.
Further, the incident part, the resonance part and the throat are integrally formed or sequentially connected through threads.
According to the pure water cavitation jet impact strengthening nozzle, the bionic structure is arranged on the inner wall of the resonance part, and the resonance part is arranged to be of a necking structure, so that the cavitation rate can be greatly improved; by enabling the throat to comprise the expansion cavity with the variable diameter, the cavitation influence area can be effectively reduced, and therefore the cavitation effect is better.
Drawings
FIG. 1 is a perspective view of a pure water cavitation jet impact strengthening nozzle provided by an embodiment of the invention;
FIG. 2 is a front view of a pure water cavitation jet impact reinforcement nozzle provided by an embodiment of the invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIGS. 4 a-4 c are surface residual compressive stress cloud plots of control group 1, control group 2 and experimental group, respectively, at an incident pressure of 2 MPa;
FIGS. 5 a-5 c are surface residual compressive stress cloud patterns of control group 1, control group 2 and experimental group, respectively, at an incident pressure of 3 MPa;
fig. 6 a-6 c are surface residual compressive stress cloud plots for control group 1, control group 2 and experimental group, respectively, at an inlet pressure of 4 MPa.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, the embodiment of the invention provides a pure water cavitation jet impact strengthening nozzle, which comprises an incidence part 1, a resonance part 2 and a throat pipe 3 which are sequentially connected, wherein the incidence part 1 is provided with an incidence cavity 11, the resonance part 2 is provided with a resonance cavity 21, the throat pipe 3 is provided with a throat pipe cavity 300, the incidence cavity 11, the resonance cavity 21 and the throat pipe cavity 300 are mutually communicated, an outlet 33 is arranged on the throat pipe 3 and is used for communicating the throat pipe cavity 300 with the outside, one end (namely the rightmost end in fig. 3) of the incidence part 1, far away from the resonance part 2, is provided with an incidence port 12 which is used for communicating the outside and the incidence cavity 11 and is used for introducing water jet, and the side wall of the incidence part 1 is provided with a gas jet hole 13 which is used for communicating the outside and the incidence cavity 11 and is used for introducing gas; the inner wall of the resonance part 2 is provided with a bionic structure. When the device is used, external water jet flows into the incidence cavity 11 through the incidence port 12, the air jet holes on the side face ventilate to the incidence cavity 11 at a certain frequency, so that the water medium in the incidence cavity 11 is changed in flow state, then the water enters the resonant cavity 21, the bionic structure in the resonant cavity intensifies the oscillation of the water, the flow state of the water is further changed, finally the water enters the throat cavity 300 and is sprayed out from the outlet 33, cavitation occurs, and the surface of a workpiece is intensified.
On the inner wall of the resonator 2 are distributed uniformly biomimetic structures 22, which according to a preferred embodiment of the invention are raised clam skin structures, which will exacerbate the oscillations of the water jet as it passes through the resonator 21, thus making it flow state transition.
The gas jet holes 13 can be arranged in a plurality, for example, two gas jet holes 13 are uniformly arranged along the circumferential direction of the incidence part 1, and the two gas jet holes 13 are oppositely arranged, so that in the strengthening process, 2 gas jet holes are simultaneously ventilated into the incidence cavity 11, the gas content is increased, the flow state conversion efficiency of the water jet is improved, and further, a better cavitation effect can be generated.
The throat 3 comprises an inlet part 31 and an expansion part 32 which are connected with each other, the inlet part 31 is provided with an inlet cavity 311, the expansion part 32 is provided with an expansion cavity 321, the inlet cavity 311 and the expansion cavity 321 are communicated, the throat cavity 300 is formed by the inlet part 31 and the resonant part 2, the inlet cavity 311 is communicated with the resonant cavity 21, an outlet 33 is arranged at one end of the expansion part 32 far away from the inlet part 31 and is used for communicating the expansion cavity 321 with the outside, the expansion part 32 is a variable-diameter cavity, namely, the diameter of the expansion cavity 321 is gradually increased from the inlet cavity 311 to the outlet 33, and then is gradually reduced, so that the water of jet flow is relatively concentrated, obvious divergence is not generated, and the area of a cavitation influence area is reduced. Preferably, the outer and inner walls of the expansion 32 are ellipsoidal.
The inlet portion 31 is a hollow cylinder having the same inner diameter as that of one end of the expansion portion 32 to achieve connection.
The outer wall and the inner wall of the resonance part 2 are of a necking structure, namely, the inner diameter of the resonance part 2 gradually decreases from one end connected with the incidence part 1 to one end connected with the inlet part 31, and the inner diameters of the two ends are the same as the inner diameters of the inlet part 31 and the incidence part 1 respectively, so that the cavitation effect can be improved, and the oscillation performance can be improved.
Preferably, both the outer wall and the inner wall of the resonance portion 2 are hyperbolic.
The incident portion 1 is a hollow cylinder, one end of which serves as an incident port 12, and the other end of which communicates with the resonance portion 2.
The incident portion 1, the resonance portion 2, and the throat 3 may be connected by screw connection or welding, or may be integrally formed, which is not limited by the present invention.
According to the pure water cavitation jet impact strengthening nozzle provided by the embodiment of the invention, the bionic structure 22 is arranged on the inner wall of the resonance part 2, and the resonance part 2 is in a necking structure, so that the cavitation rate can be greatly improved; by including the throat 3 with a variable diameter expansion chamber 32, the cavitation impact zone can be effectively reduced, thereby making cavitation better.
The 6061 aluminum alloy is selected as a research object, and the strengthening process based on different cavitation water jet flows is formulated so as to verify the strengthening effect of the pure water cavitation jet flow impact strengthening nozzle. The method comprises the steps of firstly selecting a strengthening result of a direct injection nozzle as a control group 1 and a strengthening result of a fan-shaped nozzle as a control group 2, then using the strengthening result of the pure water cavitation jet impact strengthening nozzle in the embodiment of the invention as an experimental group, strengthening the 6063 aluminum alloy surface by adopting different water jet pressures, and analyzing the residual compressive stress of the aluminum alloy surfaces of the control group 1, the control group 2 and the experimental group respectively.
FIGS. 4 a-4 c show the surface residual compressive stress cloud of control group 1, control group 2 and experimental group at an incident pressure of 2MPa, and it can be seen from FIGS. 4 a-4 c that the surface residual compressive stress value of the experimental group is about 1.8 times that of control group 1 and about 1.5 times that of control group 2; FIGS. 5 a-5 c are surface residual compressive stress cloud plots of control group 1, control group 2 and experimental group at an incident pressure of 3MPa, respectively, wherein the surface residual compressive stress value of the experimental group is about 2.1 times that of control group 1 and about 1.8 times that of control group 2; FIGS. 6 a-6 c are surface residual compressive stress cloud plots of control group 1, control group 2 and experimental group at an inlet pressure of 4MPa, respectively, and it can be seen from FIGS. 6 a-6 c that the surface residual compressive stress value of the experimental group is about 1.9 times that of control group 1 and about 1.7 times that of control group 2; therefore, the pure water cavitation jet impact strengthening nozzle can greatly improve the strengthening effect.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications can be made to the above-described embodiment of the present invention. All simple, equivalent changes and modifications made in accordance with the claims and the specification of this application fall within the scope of the patent claims. The present invention is not described in detail in the conventional art.
Claims (8)
1. A pure water cavitation jet impact strengthening nozzle, characterized by comprising: the internal cavity is communicated with the incident part, the resonance part and the throat pipe in sequence along the axial direction; the incidence part is provided with an incidence cavity, the resonance part is provided with a resonance cavity, the throat is provided with a throat cavity, and the incidence cavity, the resonance cavity and the throat cavity are communicated with each other;
the incidence part is provided with an incidence port and at least one gas jet hole, wherein the incidence port is communicated with the incidence cavity and the outside, the incidence port is used for introducing water jet, and the gas jet hole is arranged to ventilate the incidence cavity at a preset frequency so as to change the flowing state of an aqueous medium in the incidence cavity; the inner wall of the resonance part is provided with a bionic structure which is a raised clam skin structure; the throat is provided with an outlet communicated with the throat cavity and the outside; the throat comprises an inlet part and an expansion part which are connected with each other, the inlet part is provided with an inlet cavity, the expansion part is provided with an expansion cavity, the inlet cavity is communicated with the expansion cavity and is formed into the throat cavity, and the diameter of the expansion cavity is gradually increased from the inlet cavity to the outlet and then gradually decreased.
2. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the expansion portion is ellipsoidal.
3. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the inlet portion of the throat is a hollow cylinder.
4. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the inner diameter of the resonance portion gradually decreases from the end connected to the incidence portion to the end connected to the throat.
5. The pure water cavitation jet impact reinforcement nozzle of claim 4, wherein the resonating section is hyperbolic.
6. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the incident portion is a hollow cylinder.
7. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the gas jet holes are located at a side wall of the incidence part and are uniformly arranged along a circumferential direction.
8. The pure water cavitation jet impact reinforcement nozzle of claim 1, wherein the incident portion, the resonance portion and the throat are integrally formed or sequentially connected by threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011460234.6A CN112589694B (en) | 2020-12-11 | 2020-12-11 | Pure water cavitation jet impact strengthening nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011460234.6A CN112589694B (en) | 2020-12-11 | 2020-12-11 | Pure water cavitation jet impact strengthening nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN112589694A CN112589694A (en) | 2021-04-02 |
| CN112589694B true CN112589694B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011460234.6A Active CN112589694B (en) | 2020-12-11 | 2020-12-11 | Pure water cavitation jet impact strengthening nozzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115446007B (en) * | 2022-09-28 | 2023-08-11 | 南京工程学院 | Cleaning system combining high-pressure jet flow and cavitation jet flow |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2007040423A1 (en) * | 2005-10-05 | 2007-04-12 | Indus Kashipovich Shamatov | Method for realising energy by means o a reciprocating motion and a device for converting and releasing energy in liquid media |
| CN102989612A (en) * | 2011-09-14 | 2013-03-27 | 李远明 | Self-suction pulse water jet ejection device |
| CN204338357U (en) * | 2014-10-23 | 2015-05-20 | 西华大学 | A kind of centralized rotation Cavitation jet nozzle |
| CN205797539U (en) * | 2016-05-30 | 2016-12-14 | 洛阳双瑞防腐工程技术有限公司 | A kind of scaling type nozzle |
| RU2625874C1 (en) * | 2016-11-15 | 2017-07-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тамбовский государственный технический университет" (ФГБОУ ВО "ТГТУ") | Hydrodynamic mixer |
| CN106984449A (en) * | 2017-05-10 | 2017-07-28 | 哈尔滨工程大学 | A kind of cavitating nozzle with resonator |
| CN107051761A (en) * | 2017-04-28 | 2017-08-18 | 燕山大学 | Multi-resonant cavate Cavitation jet nozzle |
| CN110102416A (en) * | 2019-05-05 | 2019-08-09 | 西南石油大学 | A kind of oscillation self-priming nozzle |
| CN110743717A (en) * | 2019-11-26 | 2020-02-04 | 武汉理工大学 | Car washing nozzle device based on cavitation jet principle |
-
2020
- 2020-12-11 CN CN202011460234.6A patent/CN112589694B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2198041Y (en) * | 1994-05-25 | 1995-05-24 | 石油大学(华东) | Self exciting vibration cavitation efflux generator |
| WO2007040423A1 (en) * | 2005-10-05 | 2007-04-12 | Indus Kashipovich Shamatov | Method for realising energy by means o a reciprocating motion and a device for converting and releasing energy in liquid media |
| CN102989612A (en) * | 2011-09-14 | 2013-03-27 | 李远明 | Self-suction pulse water jet ejection device |
| CN204338357U (en) * | 2014-10-23 | 2015-05-20 | 西华大学 | A kind of centralized rotation Cavitation jet nozzle |
| CN205797539U (en) * | 2016-05-30 | 2016-12-14 | 洛阳双瑞防腐工程技术有限公司 | A kind of scaling type nozzle |
| RU2625874C1 (en) * | 2016-11-15 | 2017-07-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тамбовский государственный технический университет" (ФГБОУ ВО "ТГТУ") | Hydrodynamic mixer |
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| CN106984449A (en) * | 2017-05-10 | 2017-07-28 | 哈尔滨工程大学 | A kind of cavitating nozzle with resonator |
| CN110102416A (en) * | 2019-05-05 | 2019-08-09 | 西南石油大学 | A kind of oscillation self-priming nozzle |
| CN110743717A (en) * | 2019-11-26 | 2020-02-04 | 武汉理工大学 | Car washing nozzle device based on cavitation jet principle |
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| CN112589694A (en) | 2021-04-02 |
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