CN102680585B - Ultrasonic detector based design method for water-logging probe water-spray coupling device - Google Patents

Abstract

The invention discloses a design method of a water spray coupling device based on a water immersion probe of an ultrasonic detector. The present invention comprises the following steps: Step (1) measures the basic parameters of the ultrasonic probe, including the diameter and length of the front end, the middle end, and the rear end of the probe, and the frequency of emitting ultrasonic waves; step (2) determines the water inlet conduit, The parameters of the fixed cover, the mixing chamber shell, the guide ring, the mixing chamber cover, the ultrasonic probe, the transition pipe, the first pipe, the second pipe, the third pipe, and the fourth pipe; Cover, water mixing chamber shell, diversion ring, mixing water chamber cover, ultrasonic probe, transition pipe, first pipe, second pipe, third pipe, fourth pipe connection and matching methods, using solidworks software to establish the three-dimensional nozzle Model and export design drawings. The laminar flow structure is stable, the nozzle is simple, the ultrasonic probe is stable, and it is economical and environmentally friendly.

Description

Based on the method for designing of ultrasound measuring instrument immersion probe water spray coupling device

Technical field

The invention belongs to UT (Ultrasonic Testing) technical field, especially relate to a kind of method for designing based on ultrasound measuring instrument immersion probe water spray coupling device.

Background technology

Modern industry is produced the quality of the workpiece such as metal has been proposed to higher requirement, and this has also promoted the development of workpiece inspection technique.UT (Ultrasonic Testing), owing to possessing the advantages such as simple, efficient, Detection Cycles is short, with low cost, becomes the main way of workpiece flaw detection always.And on its basis derivative water-soaked probe to detect be a kind of technology in the ascendant.This technology is couplant by water, and the sound wave of ultra-sonic defect detector transmitting is imported and detects workpiece, and greatly degree has reduced the loss of ultrasonic energy, but the design of water spray probe has been proposed to higher requirement.

At present, existing ultrasound wave water spray coupling probe is mostly single structure, when work, can only assemble a kind of ultrasonic probe, uses the sonic detection metal of finite frequency.Such probe control underaction, is also difficult to meet the metal defect detection requirement day by day increasing, and can not reach the requirement of energy-conserving and environment-protective.In the ultrasonic probe having come out at present, as invent 200920278316.1 " for the shutter-type water jet probe device of ultrasonic thickness measurement and carrying out flaw detection " and have and automatically open shutter, realize good water spray coupling thickness measuring task, but do not possess flaw detection function, cannot make adjustment to shower nozzle profile according to the difference of test material yet; For another example invent 03219895.7 " transverse wave water spray probe " and can effectively improve accuracy of detection, comparatively complicated but structural design obtains, be unfavorable for mounting or dismounting and make regular check on.

Summary of the invention

The object of the invention is for the deficiencies in the prior art, a kind of method for designing based on ultrasound measuring instrument immersion probe water spray coupling device is provided.

The technical solution adopted for the present invention to solve the technical problems is as follows:

Step (1). measure the basic parameter of ultrasonic probe, comprise probe front end, middle-end, rear end diameter and length, launch hyperacoustic frequency;

1-1. obtains the point diameter of ultrasonic probe by vernier caliper measurement

, front end length

, middle-end diameter

, middle-end length , rear end diameter

, ultrasound wave surface of emission diameter ; Obtain the ultrasound wave transmission frequency M of ultrasonic probe by inquiry;

Step (2). according to the basic parameter of ultrasonic probe, determine the parameter into water conduit, fixed cap, mixed water cavity shell, guide ring, mixed water cavity lid, ultrasonic probe, transition conduit, the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline;

The internal diameter of 2-1. the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline is

, and with the ultrasound wave surface of emission equal diameters of ultrasonic probe front end,

=

;

The length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline is respectively

be calculated as follows:

Recorded by ultrasonic probe data: transmission frequency is that M, wafer diameter are

, water mid-focal length value is

; If acoustic beam is all pressed rectilinear propagation in sound lens, couplant, workpiece,

for the organic glass velocity of sound;

for the velocity of sound of couplant, wherein couplant is water, water mid-focal length value

be calculated as follows:

Wafer radius-of-curvature

be calculated as follows:

If acoustic velocity is in workpiece

, the investigation depth that detects workpiece is

, the total length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

approximate formula is as follows:

2-2. is according to the constant principle in cross section, transition conduit inner diameter

be calculated as follows:

2-3. enters water conduit water side and is provided with annular protrusion, water side is run through on fixed cap after manhole, be threaded with the manhole on mixed water cavity shell, establishing into the number of water conduit is N (being any positive integer by the desirable N value of principle easy to use), enters water conduit internal diameter

be calculated as follows:

Enter water conduit external diameter

;

The mixed water cavity shell of 2-4. and fixed cap are provided with N manhole, an axis through-hole; Wherein the axis through-hole on fixed cap is provided with rubber water proof ring, and axis through-hole diameter on fixed cap

=

, the axis through-hole diameter on mixed water cavity shell

=

; Ultrasonic probe front end is through the axis through-hole on mixed water cavity shell, and rear end is through the axis through-hole on fixed cap, and middle-end is stuck between fixed cap and mixed water cavity shell; N center of circle through hole of mixed water cavity shell and fixed cap is all along being circumferentially evenly distributed, and diameter is identical, and the center of circle through hole wherein mixing on water cavity shell is provided with internal thread, and enters water conduit front end and is threaded.

The mixed water cavity lid of 2-5. axle center is provided with axis through-hole, and axis through-hole is provided with internal thread, is threaded with transition conduit; Mixed water cavity lid outward flange is provided with external thread, and is threaded with mixed water cavity shell;

2-6. guide ring external diameter

, internal diameter

; Guide ring internal diameter intermediate radial is evenly distributed with four projections, the distance between symmetrical projection

;

Step (3). determine connection and fit system into water conduit, fixed cap, mixed water cavity shell, guide ring, mixed water cavity lid, ultrasonic probe, transition conduit, the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline, use solidworks software set up the three-dimensional model of shower nozzle and derive design drawing.

3-1. enters water conduit and is threaded through the mixed water cavity shell of the center of circle through hole on fixed cap; Ultrasonic probe front end is through the axis through-hole on mixed water cavity shell, and rear end is through the axis through-hole on fixed cap, and middle-end is stuck between fixed cap and mixed water cavity shell; The front end of mixed water cavity shell is threaded with transition conduit rear end; Transition conduit middle-end is provided with guide ring, transition conduit front end is connected with the threaded one end of the first pipeline, the other end of the first pipeline is connected with the threaded one end of second pipe, the other end of second pipe is connected with the threaded one end of the 3rd pipeline, the other end of the 3rd pipeline is connected with the threaded one end of the 4th pipeline, the other end water outlet of the 4th pipeline.

The three-dimension modeling of 3-2. shower nozzle and derivation are as follows:

By design parameter be input to and use SolidWorks software, automatically generate the three-dimensional model of shower nozzle, derive after then three-dimensional model being converted to 2 D Part Drawings and wiring layout;

Described design parameter comprise the point diameter of ultrasonic probe

, front end length

, middle-end diameter

, middle-end length , rear end diameter

, ultrasound wave surface of emission diameter

, ultrasound wave transmission frequency M, transition conduit inner diameter

, enter water conduit internal diameter

, enter water conduit external diameter

, the internal diameter of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

, mixed water cavity columella heart through-hole diameter

, fixed cap manhole diameter

, guide ring external diameter , internal diameter

, the distance between the symmetrical projection of guide ring

, the length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

, water mid-focal length value is

, the organic glass velocity of sound

, the velocity of sound of couplant , acoustic velocity in workpiece

, wafer radius-of-curvature

, investigation depth is

, the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline total length

, enter the number N of water conduit.

Beneficial effect of the present invention is as follows:

The present invention utilizes N even water inlet that enters water conduit, after in mixed water cavity, water evenly being mixed, sprays by water delivering orifice, forms comparatively stable laminar flow structure, is convenient to ultrasound wave and in fluid, propagates and detect a flaw, and effectively reduced the generation of bubble.Simultaneously, the present invention considers economy and the feature of environmental protection, adopt fluid mechanics and mechanical knowledge, in conjunction with three-dimensional modeling and fluid simulation software, utilize into water conduit by fixed cap and mixed water cavity close-coupled, in order to clamp ultrasonic probe, both reduced the complexity of shower nozzle, fixedly secure again ultrasonic probe, and can clamp according to the different flexible of probe size the position of accessory, obtained the income of killing two birds with one stone.

Brief description of the drawings

Fig. 1 is water spray coupling device side view.

Fig. 2 is guide ring vertical view.

In figure: enter water conduit 1, fixed cap 2, mixed water cavity shell 3, fair water fin 4, mixed water cavity lid 5, ultrasonic probe 6, transition conduit 7, the first pipeline 8, second pipe 9, the 3rd pipeline 10, the 4th pipeline 11.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described.

A method for designing for water spray coupling device based on ultrasound measuring instrument immersion probe, specifically comprises the steps:

Step (1). measure the basic parameter of ultrasonic probe 6, comprise probe front end, middle-end, rear end diameter and length, launch hyperacoustic frequency;

1-1. obtains the point diameter of ultrasonic probe 6 by vernier caliper measurement

, front end length

, middle-end diameter

, middle-end length

, rear end diameter

, ultrasound wave surface of emission diameter

; Obtain the ultrasound wave transmission frequency M of ultrasonic probe by inquiry;

Step (2). as shown in Figure 1, according to the basic parameter of ultrasonic probe, determine the parameter into water conduit 1, fixed cap 2, mixed water cavity shell 3, fair water fin 4, mixed water cavity lid 5, ultrasonic probe 6, transition conduit 7, the first pipeline 8, second pipe 9, the 3rd pipeline 10, the 4th pipeline 11;

The internal diameter of 2-1. the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline is , and with the ultrasound wave surface of emission equal diameters of ultrasonic probe front end,

=

;

The length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline is respectively

be calculated as follows:

Recorded by ultrasonic probe data: transmission frequency is that M, wafer diameter are

, water mid-focal length value is

; If acoustic beam is all pressed rectilinear propagation in sound lens, couplant, workpiece,

for the organic glass velocity of sound;

for the velocity of sound of couplant, wherein couplant is water, water mid-focal length value

be calculated as follows:

Wafer radius-of-curvature

be calculated as follows:

If acoustic velocity is in workpiece , the investigation depth that detects workpiece is

, the total length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

approximate formula is as follows:

2-2. is according to the constant principle in cross section, and transition conduit inner diameter is calculated as follows:

2-3. enters water conduit water side and is provided with annular protrusion, water side is run through on fixed cap after manhole, be threaded with the manhole on mixed water cavity shell, the annular protrusion entering on water conduit is stuck in fixed cap outside, be N (being any positive integer by the desirable N value of principle easy to use) if enter the number of water conduit, enter water conduit internal diameter

be calculated as follows:

Enter water conduit external diameter

;

The mixed water cavity shell of 2-4. and fixed cap are provided with N manhole, an axis through-hole; Wherein the axis through-hole on fixed cap is provided with rubber water proof ring, the axis through-hole diameter on fixed cap =

, the axis through-hole diameter on mixed water cavity shell =

; Ultrasonic probe front end is through the axis through-hole on mixed water cavity shell, and rear end is through the axis through-hole on fixed cap, and middle-end is stuck between fixed cap and mixed water cavity shell; N center of circle through hole of mixed water cavity shell and fixed cap is all along being circumferentially evenly distributed, and diameter is identical, and the center of circle through hole wherein mixing on water cavity shell is provided with internal thread, and enters water conduit front end and is threaded.

The mixed water cavity lid of 2-5. axle center is provided with axis through-hole, and axis through-hole is provided with internal thread, is threaded with transition conduit; Mixed water cavity lid outward flange is provided with external thread, and is threaded with mixed water cavity shell;

2-6. as shown in Figure 2, guide ring external diameter

, internal diameter

; Guide ring internal diameter intermediate radial is evenly distributed with four projections, the distance between symmetrical projection

; Guide ring is arranged on transition conduit rear end, and its effect is to reinforce ultrasonic probe, and does not affect current and pass through.

Step (3). determine connection and fit system into water conduit, fixed cap, mixed water cavity shell, guide ring, mixed water cavity lid, ultrasonic probe, transition conduit, the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline, use solidworks software set up the three-dimensional model of shower nozzle and derive design drawing.

The water intake end that 3-1. enters water conduit 1 connects rubber water pipe, and water side is provided with annular protrusion, and water side is run through on fixed cap 2 after manhole, is threaded with the manhole on mixed water cavity shell 3, and annular protrusion is stuck in fixed cap 2 outsides; The inner side of guide ring 4 is provided with four projections, and outside it, is arranged on one end of transition conduit 7, and this end of transition conduit 7 is connected with the threaded one end of mixed water cavity cap 5; The other end of mixed water cavity cap 5 is threaded with mixed water cavity shell 3; The front end of ultrasonic probe 6 is successively through the axis through-hole and the guide ring 4 that mix water cavity shell 3, the projection of guide ring 4 inner sides is fixed the front end of ultrasonic probe 6, the rear end of ultrasonic probe 6 is through the axis through-hole of fixed cap 2, and middle-end is stuck between fixed cap 2 and mixed water cavity shell 3; And enter water conduit 1 water side, mixed water cavity shell 3 inwalls, guide ring 4, mixed water cavity cap 5 inwalls, ultrasonic probe 6 outer walls and be combined into the mixed water cavity of annular; One end of the first pipeline 8 is threaded with the other end of transition conduit 7, the other end of the first pipeline 8 is connected with the threaded one end of second pipe 9, the other end of second pipe 9 is connected with the threaded one end of the 3rd pipeline 10, the other end of the 3rd pipeline 10 is connected with the threaded one end of the 4th pipeline 11, the other end water outlet of the 4th pipeline 11.

The described water conduit 1 that enters has N root, and fixed cap 2, mixed water cavity cap 5 have and the manhole that enters water conduit 1 quantity and equate, and the center of fixed cap, mixed water cavity cap all has axis through-hole.

Described mixed water cavity shell 3 and the axis through-hole diameter of fixed cap 2 are less than the diameter of ultrasonic probe 6 middle-ends, and therefore, the middle-end of ultrasonic probe 6 is stuck between fixed cap 2 and mixed water cavity shell 3.

The three-dimension modeling of 3-2. shower nozzle and derivation are as follows:

By design parameter be input to and use SolidWorks software, automatically generate the three-dimensional model of shower nozzle, derive after then three-dimensional model being converted to 2 D Part Drawings and wiring layout;

Described design parameter comprise the point diameter of ultrasonic probe

, front end length

, middle-end diameter

, middle-end length

, rear end diameter

, ultrasound wave surface of emission diameter , ultrasound wave transmission frequency M, transition conduit inner diameter

, enter water conduit internal diameter

, enter water conduit external diameter

, the internal diameter of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

, mixed water cavity columella heart through-hole diameter

, fixed cap manhole diameter , guide ring external diameter

, internal diameter

, the distance between the symmetrical projection of guide ring

, the length of the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline

, water mid-focal length value is

, the organic glass velocity of sound

, the velocity of sound of couplant

, acoustic velocity in workpiece

, wafer radius-of-curvature

, investigation depth is , the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline total length

, enter the number N of water conduit.

It is as follows that the present invention has designed the rear course of work:

The many water intake ends that enter water conduit 1 are all connected to water source, make every to enter water conduit 1 and evenly enter water; The middle-end of ultrasonic probe 6 is stuck between fixed cap 2 and mixed water cavity shell 3.Current flow out by the space between fair water fin 4 and ultrasonic probe 6 front ends after mixing in the mixed water cavity of annular, through being ejected into the state of laminar flow the surface of detecting workpiece from the other end of the 4th pipeline 11 after transition conduit 7, the first pipeline 8, second pipe 9, the 3rd pipeline 10, the 4th pipeline 11.

Claims (2)

1. Based on the design method of the ultrasonic detector water immersion probe water spray coupling device, it is characterized in that the following steps: Step (1). Measure the basic parameters of the ultrasonic probe, including the diameter and length of the front end and middle end of the probe, the diameter of the rear end, and the frequency of emitting ultrasonic waves; Step (2). According to the basic parameters of the ultrasonic probe, determine the water inlet conduit, fixed cover, mixing chamber shell, diversion ring, mixing chamber cover, ultrasonic probe, transition pipe, first pipe, second pipe, and third pipe , the parameter of the fourth pipeline; Step (3). Determine the connection of the water inlet conduit, the fixed cover, the mixing chamber shell, the guide ring, the mixing chamber cover, the ultrasonic probe, the transition pipe, the first pipe, the second pipe, the third pipe, the fourth pipe and With the way of cooperation, use solidworks software to build a three-dimensional model of the nozzle and export the design drawings; The measurement steps of the basic parameters of the ultrasonic probe are as follows: Obtain front-end diameter d ₁ , front-end length l ₁ , middle-end diameter d ₂ , middle-end length l ₂ , back-end diameter d ₃ , and ultrasonic emission surface diameter d ₄ by measuring with a vernier caliper; obtain the ultrasonic emission frequency M of the ultrasonic probe through query; The parameters of the water inlet conduit, the fixed cover, the water mixing chamber shell, the guide ring, the water mixing chamber cover, the ultrasonic probe, the transition pipe, the first pipe, the second pipe, the third pipe, and the fourth pipe are calculated as follows: 3-1. The inner diameters of the first pipe, the second pipe, the third pipe, and the fourth pipe are all d ₇ , which is equal to the diameter of the ultrasonic emitting surface at the front end of the ultrasonic probe, that is, d ₇ =d ₄ ; The lengths of the first pipe, the second pipe, the third pipe, and the fourth pipe are l ₃ , l ₄ , l ₅ , l ₆ respectively, calculated as follows: Measured from the data of the ultrasonic probe: the emission frequency is M, the diameter of the chip is d ₄ , and the focal length in water is f; assuming that the sound beam propagates in a straight line in the acoustic lens, coupling medium and workpiece, C ₁ is the sound speed of organic glass; C ₂ is the sound velocity of the coupling medium, where the coupling medium is water, then the focal length f in water is calculated as follows: $\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$ The radius of curvature r of the wafer is calculated as follows: $\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}$ Assuming that the sound wave velocity in the workpiece is C ₃ , and the detection depth of the workpiece is L, the approximate formula of the total length l of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline is as follows: $\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; L</span>}\frac{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$ 3-2. According to the principle of constant section, the diameter of the inner wall of the transition pipe is calculated as follows: ${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; =</span>\sqrt{{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{}_{}}$ 3-3. The outlet end of the water inlet pipe is provided with a ring-shaped protrusion. After the water outlet end passes through the circular through hole on the fixed cover, it is threadedly connected with the circular through hole on the shell of the mixing chamber. If the number of water inlet pipes is N, then the water inlet The catheter inner diameter _d6 is calculated as follows: ${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\sqrt{\mathrm{<span\; class="notranslate">\; N</span>}}}$ Outer diameter of water inlet conduit d ₁₃ =1.4×d ₆ ; 3-4. Both the water mixing chamber shell and the fixed cover are provided with N circular through holes and one axial through hole; the axial through hole on the fixed cover is provided with a rubber waterproof ring with a diameter of d ₉ =d ₃ , The diameter of the axial through hole on the mixing chamber shell is d ₈ =d ₁ ; the front end of the ultrasonic probe passes through the axial through hole on the mixing chamber shell, the rear end passes through the axial through hole on the fixed cover, and the middle end is stuck in the Between the fixed cover and the water mixing chamber shell; the N center through holes of the water mixing chamber shell and the fixed cover are evenly distributed along the circumference, and have the same diameter, wherein the center through holes on the water mixing chamber shell are provided with internal threads, Threaded connection with the front end of the water inlet conduit; 3-5. The axis of the mixing chamber cover is provided with an axis through hole, and the axis through hole is provided with an internal thread, which is threadedly connected with the transition pipe; the outer edge of the mixing chamber cover is provided with an external thread, and is threaded with the mixing chamber shell connect; 3-6. The outer diameter of the guide ring d ₁₀ =1.2×d ₅ , the inner diameter d ₁₁ =d ₅ ; there are four protrusions evenly distributed in the radial direction in the middle of the inner diameter of the guide ring, and the distance between the symmetrical protrusions is d ₁₂ =d ₁ ; The connection and matching methods of the water inlet conduit, the fixed cover, the water mixing chamber shell, the guide ring, the water mixing chamber cover, the ultrasonic probe, the transition pipe, the first pipe, the second pipe, the third pipe, and the fourth pipe are as follows : The water inlet conduit passes through the circular through hole on the fixed cover and is threadedly connected to the shell of the mixing chamber; The end is stuck between the fixed cover and the mixing chamber shell; the front end of the mixing chamber shell is threadedly connected to the rear end of the transition pipe; the middle end of the transition pipe is provided with a guide ring, and the front end of the transition pipe is threadedly connected to one end of the first pipe The other end of a pipeline is screwed to one end of the second pipeline, the other end of the second pipeline is screwed to one end of the third pipeline, the other end of the third pipeline is screwed to one end of the fourth pipeline, and the other end of the fourth pipeline out of water. 2. the design method based on the water immersion probe water spray coupling device of the ultrasonic detector according to claim 1, is characterized in that the establishment of the nozzle three-dimensional model, the derivation of the design drawings are specifically as follows: Input the designed parameters into SolidWorks software to automatically generate a 3D model of the nozzle, and then convert the 3D model into a 2D part drawing and assembly drawing and export it; The designed parameters include the diameter of the front end of the ultrasonic probe d ₁ , the length of the front end l ₁ , the diameter of the middle end d ₂ , the length of the middle end l ₂ , the diameter of the rear end d ₃ , the diameter of the ultrasonic emitting surface d ₄ , and the ultrasonic emitting frequency M , the diameter of the inner wall of the transition pipe d ₅ , the inner diameter of the water inlet pipe d ₆ , the outer diameter of the water inlet pipe d ₁₃ , the inner diameters of the first pipe, the second pipe, the third pipe, and the fourth pipe d ₇ , the diameter of the axial through hole of the mixing chamber shell d ₈ , the diameter of the axial through hole of the fixed cover d ₉ , the outer diameter of the guide ring d ₁₀ , the inner diameter d ₁₁ , the distance between the symmetrical protrusions of the guide ring d ₁₂ , the first pipe, the second pipe, the third pipe, The length of the fourth pipe l ₃ , l ₄ , l ₅ , l ₆ , the focal length in water f, the sound velocity of plexiglass C ₁ , the sound velocity of coupling medium C ₂ , the sound wave velocity in the workpiece C ₃ , the radius of curvature r of the chip, and the detection depth is L, the total length l of the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline, and the number N of water inlet conduits.

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