Selective catalytic reduction (SCR) system ultrasonic probe matching assembly

Abstract

An SCR system ultrasonic probe matching assembly comprises a main body part, a main body limiting and fixing part and a probe shell. The left end and the right end of the main body part are respectively provided with one or more tensioned thin wires; the thin wire is made of a material with smaller elasticity modulus, the diameter of the thin wire is smaller than or equal to 0.5 mm, and the thin wire and the thin wire are oppositely arranged between an ultrasonic transmitting surface and an ultrasonic receiving surface of the ultrasonic probe and can be in contact with the ultrasonic transmitting surface and the ultrasonic receiving surface; and the thin wire realizes a tensioning state by utilizing buoyancy or gravity or directly applying tensile force by virtue of a tension mechanism. The left and right ends of the main body limiting and fixing part are associated with the filaments respectively; according to the correlation mode, fixed points are designed to provide buoyancy or counteractive tension of gravity for the filaments, or an overall limiting gap is provided for the tension mechanism. The body component is designed to be rigidly connected to the ultrasound probe housing.

Description

Technical Field

[0001] The present invention relates to an exhaust gas treatment SCR system for commercial vehicles, in particular to an ultrasonic quality sensor probe for the SCR system, and more particularly to a mating assembly of the quality sensor probe, which can reduce or eliminate bubble adhesion during urea addition and violent shaking of urea residual liquid. Background Art

[0002] The ultrasonic probe used in the SCR system is a core component of the ultrasonic quality sensor. The SCR ultrasonic probe utilizes axially vibrating ultrasonic waves. This axial ultrasonic wave propagates through the urea solution being measured and, upon encountering a reflector at the front, reflects back. The reflected ultrasonic energy impacts the piezoelectric ceramic, causing mechanical vibrations of the same frequency. This mechanical vibration, due to geometric deformation, also causes periodic voltage fluctuations between the upper and lower electrodes of the piezoelectric ceramic in the axial direction. The control module of the SCR system quality sensor records the duration Δt from the time the ultrasonic wave is generated to the time it returns. The length of this Δt corresponds to the low or high concentration of the urea solution, thereby enabling concentration detection.

[0003] Ultrasonic waves have different flight characteristics in different media. Ultrasonic waves are particularly sensitive to air, experiencing significant energy attenuation when traveling through it. The amplitude of the ultrasonic signal from the time the SCR ultrasonic probe emits the ultrasonic wave to the time it is reflected back depends primarily on the number of bubbles in the urea it encounters during flight. The more and larger the bubbles, the greater the interference noise and the smaller the signal amplitude, causing a sharp drop in the signal-to-noise ratio and impacting signal detection sensitivity. Furthermore, the presence of large bubbles can cause flight time offsets, leading to system errors.

[0004] The causes of bubbles in the ultrasonic flight path are complex. Typically, this is due to the precipitation of gas from the urea solution at elevated temperatures, which reduces its solubility. Furthermore, the expansion and contraction of ultrasonic sound pressure create polarized bubbles. These precipitated or polarized bubbles are particularly susceptible to attaching to the transmitting and receiving surfaces of the ultrasonic probe. In this scenario, bubble attachment is sporadic and presents an acceptable level of risk.

[0005] Two other scenarios for bubbles in the ultrasonic flight path are currently considered the most severe by the industry and are the most common causes of failures and complaints in the market. The first is bubbles generated by the large amount of air during the urea filling process; the second is bubbles formed when the urea solution is used up and then the vehicle is subjected to severe turbulence, which stirs in a large amount of air into the urea solution. The bubbles generated in these two scenarios are characterized by their distribution throughout the urea solution, causing large areas of the liquid to change from transparent to foggy and opaque. Once filling is completed or the turbulence subsides, most of the bubbles in the opaque foggy liquid transform into gas and precipitate from the surface, gradually transforming the urea solution from opaque to translucent. This translucency is due to the presence of countless extremely small bubbles evenly distributed throughout the urea solution, visible to the naked eye. After a period of time, the translucent urea solution returns to a pure, transparent state. At this point, the ultrasonic probe's emitting and receiving surfaces will show a dense patch of large bubbles, as well as large areas of air voids. However, whether visible or invisible, bubbles can cause the probe's ultrasonic signal to disappear, resulting in urea concentration data errors. Furthermore, the signal disappearance can persist for extended periods, sometimes lasting for hours. This can cause the system to continuously report a fault, ultimately leading to customer complaints.

[0006] On the surface, the cause of this system failure appears to be visible bubbles on the ultrasonic emitting and receiving surfaces. However, a deeper investigation reveals that in addition to these visible bubbles, there is also a hidden mechanism. This hidden mechanism is that the entire surface of the probe's ultrasonic emitting and receiving surfaces is covered with large bubbles visible to the naked eye and small bubbles invisible to the naked eye. Moreover, these large and small bubbles form a bubble layer on the entire surface of the probe's ultrasonic emitting and receiving surfaces, and are adsorbed on them. This adsorbed bubble layer first dissipates ultrasonic energy and secondly remains stable on the entire surface for a long time in the urea liquid, unable to break or break away.

[0007] This patented invention builds on ultrasonic concentration detection technology and incorporates various automotive application scenarios to employ technical measures to reduce bubble aggregation, adsorption, and distribution across the entire surface of the ultrasonic probe's ultrasonic emitting and receiving surfaces. The specific strategy involves equipping the SCR system ultrasonic probe with a component, known as a companion component. This component, used in conjunction with the probe, disrupts the co-adsorbed bubble layer on the probe's ultrasonic emitting and receiving surfaces during vehicle operation, causing it to rupture and rapidly detach from the two surfaces. Summary of the Invention

[0008] The invention relates to an SCR system ultrasonic probe mating component, which is characterized by comprising a main body component, a main body limiting and fixing component and a probe shell.

[0009] The main component is a left-right distributed structure; specifically, one or more tensioned filaments are designed at each of the left and right ends, and the tensioned filaments are designed to be able to contact the ultrasonic emitting surface and the ultrasonic receiving surface of the ultrasonic probe respectively. The filaments can contact the ultrasonic emitting surface and the ultrasonic receiving surface, and there is an effective interval. The lengths of the effective intervals are D1 and D2 respectively. The distance between the two or more tensioned filaments is L1; the distance between the two planes of the ultrasonic emitting surface and the ultrasonic receiving surface is L2, and the diameters of the ultrasonic emitting surface and the ultrasonic receiving surface are d1 and d2.

[0010] Preferably, the structure ensures that: 0.10mm≤L2-L1≤1mm, D1≥d1, D2≥d2.

[0011] Preferably, the two filaments are made of the same material and have the same wire diameter.

[0012] Preferably, the wire diameter size conforms to the function: AND (<=MIN(d1, d2)*5%, <=0.5mm).

[0013] Preferably, the material is a metal or non-metal material with a small elastic modulus, high surface hardness, wear resistance and corrosion resistance.

[0014] In particular, the filament tensioning feature is achieved by utilizing either buoyancy, gravity, or by directly applying tension to the thin wire with the help of a tension structure; the tensioning state requirement is that the filament can be continuously kept straight within the plane range of the ultrasonic emitting surface and the ultrasonic receiving surface with diameters d1 and d2, without local bending.

[0015] Specifically, if the filament tensioning is based on the mechanical principle of buoyancy, it is necessary to fix a buoyancy component float at one end of the filament. The float is made of a material with a low specific gravity and will generate buoyancy in the urea solution. The component has a movement trajectory limiting gap, and the other end serves as a fixed point to generate tension.

[0016] Specifically, if the filament tensioning is based on the mechanical principle of gravity, it is necessary to fix a gravity component sinker with a heavy material that will generate a downward force in the urea solution at one end of the filament. The component has a movement trajectory limiting gap, and the other end serves as a fixed point to generate tension.

[0017] Specifically, if the filament tensioning is based on the mechanical principle of directly applying tension to the tension structure, it is necessary to provide fastening buckles at both ends of the filament to fix the two ends of the filament and generate appropriate tension.

[0018] The main body limiting component is designed to cooperate with the main body component to complete the filament:

[0019] 1) Maintain tension at all times, and

[0020] 2) Physically scrape the ultrasonic probe's ultrasonic emitting and receiving surfaces at designated locations, and

[0021] 3) It has freedom and can use external energy to make the filament move.

[0022] In particular, the design of the main body components must consider the mechanical principle or mechanical structure employed by the present invention's mating assembly. Utilizing buoyancy requires designing fixed points at both ends of the bottom of the main body's fixed component; utilizing gravity requires designing fixed points at both ends of the top of the main body's fixed component; utilizing a tension structure eliminates the need for fixed points; instead, the filament is secured to the tension structure, which is then placed between the probe's emitting and receiving or reflecting surfaces.

[0023] Specifically, the buoyancy-based fixing points are located at the bottom of each end of the main body's fixed position limiter, while the gravity-based fixing points are located at the top of each end of the main body's fixed position limiter. Limits to the movement of the buoyancy or gravity components are located at the top or bottom of each end of the main body's fixed position limiter, respectively.

[0024] Specifically, by utilizing the tension structure, since the filament is fixed on the tension structure, the filament tensioned state has been achieved, and it is only necessary to place the tension structure between the emitting surface and the receiving surface or the reflecting surface of the probe.

[0025] Preferably, the tension structure is placed in a gap area between the emitting surface and the receiving surface or the reflecting surface, where the tension structure resides and can move and rotate freely.

[0026] In particular, the edge areas at both ends of the tension structure are designed with energy transfer structures, which can receive the energy transmitted by the car due to bumps and vibrations.

[0027] The associated design of the main components of the mating assembly and the main limiting and fixing components, either by utilizing buoyancy, gravity, or tension structure, can drive the filaments to produce irregular overall synchronous movement left and right and up and down, or make deflection movements at different angles due to the bumps of the vehicle body and the vibration of the engine when the car is running or idling, thereby achieving scraping, collision, and other actions on the bubble layer attached to the emitting surface and the receiving surface or the reflecting surface of the probe, thereby destroying the integrity of the bubble layer, breaking the bubble layer and gradually detaching and dissipating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Spouse Component Diagram

[0029] 1a, main body part 2a, main body limit fixing part 11, float 12, filament 21a, fixed point

[0030] Figure 2Spouse component installation location diagram

[0031] 1a, main body 2a, main body limit fixing part 3, emission surface

[0032] 4. Receiving surface 5. Probe housing 11. Float

[0033] 12. Filament

[0034] Figure 3 Figure a of the main body limit fixing parts

[0035] 22a. Limited Space

[0036] Figure 4 Spouse component exploded view

[0037] 1b, main body part 2b, main body limiting fixing part

[0038] Figure 5 Main components diagram

[0039] 12, filament 28, pendant

[0040] Figure 6 Spouse component diagram a

[0041] 12. Thread 28, sinker 21b, fixing point

[0042] Figure 7 Figure b of the main body limit fixing component

[0043] 22b. Limited Space

[0044] Figure 8 Spouse component installation location diagram a

[0045] 3. Transmitting surface 4, receiving surface 5, probe housing 12, filament 28, sinker 22b, limited space

[0046] Figure 9 Spouse component diagram c

[0047] 1c, main body component 2c, main body limiting and fixing component

[0048] Figure 10 Spouse component diagram d

[0049] 1c, main body 12, filament 16a, tension structure 20a, fastening buckle

[0050] Figure 11 Mate component installation diagram c

[0051] 2c, main body limit fixing component 3, transmitting surface 4, receiving surface 5, probe housing 12, filament 15, gap

[0052] Figure 12 Main body limiting component diagram c

[0053] 23. Overflow opening 24. Liquid inlet opening

[0054] Figure 13 Limited space diagram

[0055] 5. Probe housing 25a, motion area 26, impact protrusion

[0056] 27. Collision Zone

[0057] Figure 14 Spouse component exploded view

[0058] 1d, main body part 2d, main body limit fixing part 14, floating ring cover

[0059] Figure 15 Main component diagram a

[0060] 1d, main body 12, filament 14, floating ring cover

[0061] 19b, tension structure 29, counterweight hole

[0062] Figure 16 Mate component installation location diagram b

[0063] 3. Emitting surface 4, Receiving surface 5, Probe housing 12, Filament 30, Mounting surface

[0064] Figure 17 Limit structure diagram

[0065] 17. Flight distance 18. Width

[0066] Figure 18 Vertical and horizontal boss drawings

[0067] 31. Vertical boss 32. Horizontal boss. DETAILED DESCRIPTION

[0068] Example 1:

[0069] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0070] like Figure 1 As shown, an SCR system ultrasonic probe mating component is characterized by comprising a main body component 1a and a main body limiting and fixing component 2a.

[0071] The buoyancy partner assembly is fixed to the probe housing 5 by means of buckles.

[0072] like Figure 1As shown, the spouse component is a left-right distributed structure, with two tensioned filaments 12 designed at the left and right ends; the left and right fixed points 21a at the bottom are respectively connected to the filaments 12, and the upper end of the filament 12 is tied with a float 11, and this connection is achieved by the buoyancy principle.

[0073] The upper ends of the filaments 12 of the main body part 1a are connected to the float 11 which can generate corresponding buoyancy.

[0074] Preferably, the float 11 is designed as a spherical structure.

[0075] Specifically, the float 11 can be made into a solid or hollow structure such as a sphere or a square.

[0076] like Figure 2 、 Figure 3 As shown, the bottom of both ends of the main body limiting fixing component 2a is designed with fixing points 21a, which lock the lower end of the filament 12; the top of both ends of the main body limiting fixing component 2a is designed with limiting spaces 22a for providing movement of the float 11.

[0077] Preferably, the limiting space 22a for the movement of the float 11 and the fixed point 21a are in a fan-shaped structure.

[0078] like Figure 2 As shown, the mating component is placed between the emitting surface 3 and the receiving surface 4 of the probe housing 5 .

[0079] Preferably, the contact distance between the filament 12 and the emitting surface 3 or the receiving surface 4 is structurally guaranteed to be: 0.10 mm ≤ L2 - L1 ≤ 1 mm, D1 ≥ d1, D2 ≥ d2.

[0080] The main body part 1a is composed of a float 11 and a filament 12, or is formed by a combination thereof or integrally injection molding.

[0081] The float 11 is a spherical structure, and can also be made into other shapes.

[0082] The float 11 is made of a material having a specific gravity smaller than that of water and is formed by machining, mold injection molding or blow molding.

[0083] The filaments 12 are made of metal or non-metal materials and are formed by cutting.

[0084] The main body limiting and fixing component 2a is made of metal or non-metal material and is formed by machining or mold injection.

[0085] Example 2:

[0086] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0087] like Figure 4 As shown, an SCR system ultrasonic probe mating component is characterized by comprising a main body component 1b and a main body limiting and fixing component 2b.

[0088] like Figure 5 As shown, the main body part 1b is composed of a filament 12 and a pendant 28, either in combination or integrally coated with rubber.

[0089] like Figure 6 As shown, the spouse component is a left-right distributed structure, and one or more tensioned filaments 12 are designed at each end; the left and right fixed points 21b at the top are respectively connected to the filaments 12, the upper end of the filament 12 is connected to the fixed point 21b, and the lower end is tied with a pendant 28. This connection uses the principle of gravity to realize the tensioning feature of the filament 12.

[0090] The lower ends of the filaments 12 of the main body part 1b are connected to the sinkers 28 that can generate corresponding falling forces.

[0091] Preferably, the sinker 28 is designed to be a spherical or conical structure.

[0092] like Figure 7 As shown, the bottom of the main body limiting and fixing component 2b is designed with a limiting space 22b for the movement of the pendant 28 at the lower end of the filament 12.

[0093] Preferably, the swing space of the pendant 28 and the fixed point 21b are in a fan-shaped structure.

[0094] like Figure 8 As shown, the mating component is placed between the emitting surface 3 and the receiving surface 4 of the probe housing 5 .

[0095] Preferably, the contact distance between the filament 12 and the emitting surface 3 or the receiving surface 4 is structurally guaranteed to be: 0.10 mm ≤ L2 - L1 ≤ 1 mm, D1 ≥ d1, D2 ≥ d2.

[0096] The main body part 2b is composed of the pendant 28 and the filament 12, or is formed by a combination thereof or by integral injection molding.

[0097] The pendant 28 is a spherical structure, and can also be made into a cone, a square or other shapes.

[0098] The pendant 28 is made of a material with a high specific gravity and is formed by machining or injection molding.

[0099] The filaments 12 are made of metal or non-metal materials and are formed by cutting.

[0100] The main body limiting and fixing component 2b is made of metal or non-metal material and is formed by machining or mold injection.

[0101] Example 3:

[0102] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0103] like Figure 9 As shown, an SCR system ultrasonic probe mating component is characterized by comprising a main body component 1c and a main body limiting and fixing component 2c.

[0104] like Figure 10 As shown, the main body component 1c is assembled by the tension structure 19a and the filament 12 through the fastening buckle 20a, or is integrally injection molded.

[0105] Preferably, the tension structure 19a is a structure that can tighten the filament 12 to achieve the tensioning characteristics of the filament 12 and tighten and lock it.

[0106] The filaments 12 on the main body part 1c are distributed in the left and right directions, with one or more tensioned filaments 12 at each of the left and right ends.

[0107] Preferably, the material of the main body component 1c is a corrosion-resistant material with a specific gravity lower than that of water, and is formed by mechanical processing or mold injection molding.

[0108] Preferably, the filaments 12 can be made of metal or non-metallic wire with a thickness less than 0.5 mm and formed by cutting.

[0109] Preferably, the main body component 1c can distribute material blocks with a slightly larger specific gravity in the material to achieve that its total gravity is equivalent to its buoyancy and the gravity is evenly distributed.

[0110] like Figure 11 As shown, the main body component 1c is placed between the probe transmitting surface 3 and the receiving surface 4, and the main body limiting and fixing component 2c is buckled on the probe housing 5.

[0111] The main body position limiting and fixing component 2c and the main body component 1c ensure the position limitation and spatial movement freedom of the main body component 1c by providing a gap 15 between the two.

[0112] Preferably, the contact distance between the filament 12 and the emitting surface 3 or the receiving surface 4 is structurally guaranteed to be: 0.10mm≤L2-L1≤1mm, D1≥d1, D2≥d2.

[0113] Specifically, the main body limiting and fixing component 2c is a shell with a similar shape to the main body component 1c and a slightly larger volume. The shell material is made of stainless steel or non-metallic material and is formed by a mold.

[0114] like Figure 12As shown, the main body limiting and fixing component 2c is designed with an overflow opening 23 on the top to facilitate the bubbles to float up and overflow; the main body limiting and fixing component 2c is designed with liquid inlet openings 24 on the left and right sides of the bottom to facilitate the urea to enter the ultrasonic flight area of ​​the probe.

[0115] Preferably, the overflow opening 23 and the inlet opening 24 are both rectangular and face upward.

[0116] like Figure 13 As shown, in particular, the inner cavity areas at the left and right ends of the main limiting and fixing component 2c are contact and collision areas 27 with the two ends of the main component 1c; correspondingly, a number of strip-shaped impact protrusions 26 are designed in the upper outer parts of the two ends of the main component 1c.

[0117] Preferably, the impact protrusions 26 are symmetrically distributed in the front-to-back direction in the vertical direction of gravity.

[0118] Example 4:

[0119] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0120] like Figure 14 As shown, an SCR system ultrasonic probe mating component is characterized by comprising a main body component 1d, a main body limiting and fixing component 2d, and a floating ring cover 14.

[0121] like Figure 15 As shown, the main body component 1d is composed of a tension structure 19b that can enable the filament 12 to achieve tensioning characteristics, and one or more filaments 12 on the left and right sides, which are assembled or overmolded by fastening buckles 20b.

[0122] The floating ring cover 14 is an arc-shaped structure, made of non-metallic material, and formed by machining or mold injection.

[0123] Preferably, a counterweight hole 29 is designed in the middle of the outer periphery of the floating ring cover 14, and the required weight size is adjusted by a counterweight block.

[0124] Preferably, both ends of the floating ring cover 14 are designed with an inverted buckle structure to be fixed on the main body component 1d.

[0125] like Figure 16 As shown, the mating component is placed between the emitting surface 3 and the receiving surface 4 of the probe.

[0126] The main body component 1d is a hollow semicircular structure, made of a non-metallic material with a specific gravity smaller than that of water, and is formed by machining or mold injection.

[0127] Preferably, the material of the main body component 1d is corrosion-resistant PP material.

[0128] like Figure 18 As shown, preferably, there are three bosses on the main body limiting and fixing component 2d, the vertical bosses 31 are arranged in a left-right symmetrical layout, and the horizontal boss 32 is centered in a fan-shaped structure.

[0129] Preferably, the emitting surface 3 and the receiving surface 4 are higher than the mounting surface 30 of the probe housing 5 to form a boss.

[0130] like Figure 17 As shown, specifically, the flight distance 17 between the emitting surface 3 and the receiving surface 4 is smaller than the width 18 of the main body limiting and fixing component 2d.

[0131] Specifically, the mating assembly is placed between the emitting surface 3 and the receiving surface 4 of the probe, and the floating ring cover 14 is buckled on the boss formed by the emitting surface 3 and the receiving surface 4 being higher than the mounting surface 30, forming a movable limiting structure of the mating assembly.

[0132] Preferably, the filament 12 can be made of nylon thread with a thickness less than 0.5 mm.

[0133] In particular, the present invention focuses on explaining that the main body component itself and the ultrasonic probe, or the main body component and the main body limit component, are designed to form a matching relationship, which ensures that the key parts of the main body component can achieve:

[0134] 1) Maintain tension at all times, and

[0135] 2) Restricted to a specific location, physical scraping occurs with the ultrasonic probe's ultrasonic transmitting and receiving surfaces, and

[0136] 3) It has spatial freedom and can absorb or borrow external energy to make the filament move.

[0137] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An SCR system ultrasonic probe mating assembly, characterized by: The invention comprises a main body component (1), a main body position-limiting and fixing component (2) and a probe housing (5); the main body component (1) is distributed on the left and right sides, and a plurality of tensioned filaments (12) of equal number are designed at the left and right ends, one end of the filament (12) is connected to a fastening buckle (20) of a float (11) or a sinker (28) or a tension structure (19), and the other end of the filament (12) is connected to another fastening buckle (20) of the tension structure (19) or a fixing point (21) of the main body position-limiting and fixing component (2), and the fixing point (21) is set at the top or bottom of the main body position-limiting and fixing component (2); the main body position-limiting and fixing component (2) either provides a hollow movement area (25) of the tension structure (19) or is designed with a position-limiting space (22) for providing movement of the float (11) or the sinker (28); the main body position-limiting and fixing component (2) is designed with a hard connection, and the hard connection has two or more buckles, which fix it to the probe housing (5).

2. According to claim 1, an SCR system ultrasonic probe mating assembly is characterized by: The tensioned filaments (12) are distributed on the left and right sides and the distance between them is L1; the filaments (12) are designed to be able to contact the emitting surface (3) and the ultrasonic receiving surface (4) of the ultrasonic probe respectively, and the lengths of the effective contact intervals of the two are D1 and D2 respectively; the two planes of the ultrasonic emitting surface (3) and the ultrasonic receiving surface (4) are disc surfaces, the distance between the two is L2, and the diameters of the two are d1 and d2 respectively, then the relationship between L2, L1, D1, D2, d1, d2 satisfies: 0.10mm≤L2-L1≤1mm, D1≥d1, D2≥d2.

3. According to claim 1 or 2, an SCR system ultrasonic probe mating assembly is characterized by: The main body component (1) and the filament (12) are made of the same material, and the first material property is a small elastic modulus, and the second material property is high surface hardness and wear resistance; the wire diameters of the filaments (12) are the same, and the sizes conform to the functional relationship: AND (<=MIN(d1, d2)*5%, <=0.5mm); the tensioning characteristics of the filaments (12) are achieved by utilizing buoyancy, or gravity, or by using the tension structure (19) to directly apply tension and the mechanical principle of the filaments (12), and the tensioning characteristics are comprehensively manifested in keeping the filaments (12) straight within the plane range of the ultrasonic emitting surface (3) and the ultrasonic receiving surface (4) with diameters of d1 and d2, without local bending.

4. According to claim 1 or 3, an SCR system ultrasonic probe mating assembly is characterized by: The positional relationship between the main body component (1), the main body limiting and fixing component (2), the probe housing (5), the ultrasonic emitting surface (3) and the ultrasonic receiving surface (4) is as follows: the ultrasonic emitting surface (3) and the ultrasonic receiving surface (4) are of the same size, coaxial, and face-to-face arrangement, with the main body component (1) clamped therebetween, and similar filaments (12) are directly opposite, coaxial, and symmetrically distributed on the left and right ends of the main body component (1); the periphery of the ultrasonic emitting surface (3), the ultrasonic receiving surface (4) and the main body component (1) is the main body limiting and fixing component (2); and the outer side of the main body limiting and fixing component (2) is the probe housing (5).

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