Ultrasonic flight channel structure for purifying liquid medium

Abstract

The invention discloses an ultrasonic flight channel structure for purifying a liquid medium. The ultrasonic flight channel structure comprises an ultrasonic probe covering surface, an ultrasonic reflection covering surface, a dirt filtering surface, a channel impact mechanism, a channel exhaust mechanism and a channel bracket, the ultrasonic probe covering surface and the sound wave reflecting covering surface are respectively opposite to the probe transmitting surface and the ultrasonic wave reflecting surface, and are in gapless contact or friction along with the running of the automobile. A cavity structure is defined by the dirt filtering face, the ultrasonic probe covering face, the ultrasonic reflection covering face, the dirt filtering face and the channel support. One end of the channel collision mechanism is connected to the channel bracket, and the other end is connected with a collision stop block; the touch stop block is located in a limited space and provides and blocks movement of the touch stop block within a set range. The channel exhaust mechanism is a hollow pipeline mechanism, and a pipeline inlet is communicated with the cavity structure. The channel support is of a rigid body structure and is connected with the ultrasonic probe covering face, the ultrasonic reflection covering face, the dirt filtering face, the channel impact mechanism and the channel exhaust mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to commercial vehicle exhaust treatment SCR system, specifically relates to the urea quality sensor for SCR system, more specifically relates to the ultrasonic wave urea liquid level detection technology of SCR system. BACKGROUND

[0002] Under the condition of modern automobile environmental protection requirement increasing year by year, the commercial vehicle environmental protection technology based on SCR technology has become the national laws and regulations, and the running commercial vehicle must be installed with SCR system. SCR system consumes a kind of blue urea, urea participates in the chemical reaction of exhaust gas in exhaust gas, specifically, it consumes nitrogen oxide (NOx) in exhaust gas, produces harmless nitrogen and water. Excessive urea will cause urea in exhaust pipe to participate in chemical reaction and be decomposed into ammonia and be discharged into the air, and insufficient urea will cause incomplete reaction of NOx and incomplete elimination. The amount of urea required for accurate chemical reaction needs to be monitored in the whole process of automobile operation, so as to realize accurate elimination of NOx. Therefore, the sensor UQS for detecting urea concentration must be designed in the SCR system.

[0003] With the rapid development of chip technology, ultrasonic wave liquid concentration measurement technology is more and more widely used in such concentration detection sensors, and the core components are ultrasonic probe and ultrasonic time of flight (TOF) chip. Since urea needs to be detected in the whole process from filling to use, the ultrasonic probe is usually installed at the bottom of the urea container, so that the concentration detection can be realized in the maximum time; however, because the automobile dealer will cause different scenes in the use process, the urea container will accumulate a large amount of dirt of different materials after years, and these dirt will float up because of the bumping of the automobile or the urea filling process, which will affect the emission and reception of the ultrasonic probe; especially, when the urea is close to being consumed and the automobile is running at high speed and bumping, or the automobile is receiving new urea filling process, the liquid and air will be stirred because of the dirt, bumping and filling process, which will produce turbidity, bubbles and the mixture of bubbles, dirt and urea, so that the emission and reception signals of the probe will be distorted, and the concentration value cannot be accurately detected.

[0004] The present application provides an ultrasonic wave flight channel structure for purifying liquid medium, and the core is: First, the channel between the emission surface and the ultrasonic wave receiving surface of the ultrasonic probe is protected from being filled with dirt, dirt-urea mixture, urea gas mixture and the mixture of urea, dirt and gas; Second, the kinetic energy of the car running or the kinetic energy of the urea liquid injection makes the sound wave transmission channel vibrate, shake or sway, etc. Random motion makes the special mechanism of the sound wave transmission channel scrape off the ultrasonic probe ultrasonic wave emitting surface and ultrasonic wave receiving surface foreign matter, protects the ultrasonic probe ultrasonic wave emitting surface and ultrasonic wave receiving surface from being covered by dirt, dirt and urea solution mixture, urea solution and gas mixture, and urea solution, dirt and gas mixture, and protects the normal emission and reception of ultrasonic wave energy. Third, the kinetic energy of the car running makes the sound wave transmission channel vibrate randomly, and then the channel structure is impacted. The impact energy can shake off the dirt solid particles on the surface of the channel. SUMMARY

[0005] An ultrasonic wave flight channel structure for purifying liquid medium, comprising: an ultrasonic probe covering surface 1, an ultrasonic wave reflection covering surface 2, a dirt filtering surface 3, a channel exhaust mechanism 4, and a channel support 5. The ultrasonic probe covering surface 1 is a soft fabric in close contact with the ultrasonic probe emitting surface. The ultrasonic wave reflection covering surface 2 is a soft fabric in close contact with the ultrasonic wave reflection surface. The dirt filtering surface 3 is a filter screen structure. In particular, the ultrasonic probe covering surface 1, the ultrasonic wave reflection covering surface 2, the dirt filtering surface 3 and the channel support 5 together form a cavity structure 51. The cavity structure 51 will prevent solid particles mixed in the urea solution, solid particles and liquid mixture, solid particles and liquid and air mixture from entering the cavity structure 51 due to the soft fabric and the filter screen of the dirt filtering surface. The channel exhaust mechanism 4 is a hollow pipe mechanism, one end of the pipe is an inlet 41 connected to the cavity structure 51, and the other end is an outlet 42 with a smaller diameter than the inlet. The outlet is designed with a sufficient length to ensure that the gas exhaust time is long enough, much larger than the urea entering and filling the internal cavity structure 51 of the ultrasonic wave flight channel structure.

[0006] The channel support 5 is a rigid structure connected to the ultrasonic probe covering surface 1, the ultrasonic wave reflection covering surface 2, the dirt filtering surface 3, the channel impact mechanism 50 and the channel exhaust mechanism 4.

[0007] In particular, the channel support is designed with a channel impact mechanism 50.

[0008] The channel impact mechanism 50 is a lever connected to a stop block 501, and the stop block 501 is located between an upper and lower limit stop plate.

[0009] Preferably, the channel impact mechanism 50 can also be a part of the channel support 5, which is a solid protruding from the base material of the channel support 5; the solid can also move with the channel support 5 within a limited range, and the movement is stopped or changed direction by the impact of the solid with the stopper.

[0010] Preferably, the stopper can be provided by other structural components of the sensor, other than the channel impact mechanism 50.

[0011] In particular, the ultrasonic probe cover surface 1, the ultrasonic wave reflection cover surface 2, the ultrasonic wave emission surface of the ultrasonic probe, and the ultrasonic wave reflection surface are in close contact, and the above-mentioned double contact is gapless contact. Superimposed on the vibration caused by the bumping of the vehicle, the vibration causes frequent and violent impact, and the channel impact mechanism 50 will correspondingly have random frequent and violent shaking; this frequent and violent shaking will cause the solid particle dirt that tries to stay on the above-mentioned ultrasonic probe cover surface 1, ultrasonic wave reflection cover surface 2, and dirt filtering surface 3 to be shaken off. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 : Schematic diagram of the cross section of the ultrasonic wave flight channel 1, ultrasonic probe cover surface 2, ultrasonic wave reflection cover surface 3, dirt filtering surface 4, channel exhaust mechanism 5, channel support Figure 2 : Distance schematic diagram Distance between the emission cover surface and the reflection cover surface L, distance between the emission surface and the reflection surface Figure 3 Schematic diagram of the cross section of the cavity structure: 1, ultrasonic probe cover surface 2, ultrasonic wave reflection cover surface 3, dirt filtering surface 5, channel support Figure 4 : Schematic diagram of the cross section of the exhaust mechanism 41, inlet 42, outlet 51, cavity structure Le, length Figure 5 : Schematic diagram of the cross section of the channel support 1, ultrasonic probe cover surface 2, ultrasonic wave reflection cover surface 3, dirt filtering surface 4, channel exhaust mechanism 5, channel support 50, impact mechanism Figure 6 : Schematic diagram of the cross section of the impact mechanism 50, impact mechanism 501, lever 502, stopper 503, defined space Figure 7 : Schematic diagram of the defined space 503, defined space 504, blocking mechanism 5041, blocking block A 5042, blocking block B Figure 8Another impact mechanism 53, entity 5043, stop block. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0014] Referring to the drawings Figure 1 As shown in the drawings, an ultrasonic flying channel structure for purifying liquid medium comprises an ultrasonic probe covering surface 1, an ultrasonic wave reflection covering surface 2, a dirt filtering surface 3, a channel exhaust mechanism 4 and a channel support 5.

[0015] The ultrasonic probe covering surface 1 is a fabric, which is in close contact with the ultrasonic probe emitting surface without any gap. In particular, the fabric is woven from a corrosion-resistant material, and after being formed, the fabric has a certain elasticity and a smooth and soft surface.

[0016] Preferably, the fabric elasticity is used to realize a negative gap between the ultrasonic probe covering surface 1 and the ultrasonic probe emitting surface.

[0017] The ultrasonic wave reflection covering surface 2 is a fabric, which is in a face-to-face relationship with the ultrasonic wave reflection surface.

[0018] In particular, the fabric is woven from a corrosion-resistant material, and after being formed, the fabric has a certain elasticity and a smooth and soft surface. Preferably, the fabric elasticity is used to realize a negative gap between the ultrasonic probe covering surface 1 and the ultrasonic probe emitting surface.

[0019] In particular, the ultrasonic probe covering surface 1 and the ultrasonic wave reflection covering surface 2 are the same type of fabric, which are integrally connected with the channel support 5 through buckling or gluing or both buckling and gluing.

[0020] Preferably, the distance D between the ultrasonic probe covering surface 1 and the ultrasonic wave reflection covering surface 2 is slightly greater than the distance L from the ultrasonic probe emitting surface to the ultrasonic wave reflection surface, as shown in the drawings. Figure 2

[0021] The dirt filtering surface 3 is a filter screen structure, which is made of a corrosion-resistant polymer material or a metal material.

[0022] Preferably, the filter screen has a pore size structure of 300 mesh or more.

[0023] In particular, the ultrasonic probe covering surface 1, the ultrasonic wave reflection covering surface 2 and the dirt filtering surface 3 together enclose a cavity structure 51 with the channel support 5, as shown in the drawings. Figure 3

[0024] Referring to the drawings​​Figure 4 As shown, the channel exhaust mechanism 4 is a hollow pipe mechanism, one end of the pipe is the inlet 41, which is connected to the cavity structure 51, and the other end is the outlet 42.

[0025] Preferably, the diameter d1 of the outlet 42 of the channel exhaust mechanism 4 is much smaller than the diameter d2 of the inlet 41, and d1 is less than 5mm.

[0026] Preferably, the outlet 42 of the channel exhaust mechanism 4 is vertically upward to ensure that the outlet is upward; specifically, a channel float block can be added, and the channel length Le is greater than 10mm.

[0027] Referring to the accompanying drawings Figure 5 As shown, the channel support 5 is a rigid structure, which is connected and integrated with the above-mentioned ultrasonic probe covering surface 1, ultrasonic wave reflection covering surface 2, dirt filtering surface 3, channel impact mechanism 50 and channel exhaust mechanism 4.

[0028] Referring to the accompanying drawings Figure 6 As shown, the channel impact mechanism 50 is a lever 501, one end of which is connected to the channel support 5, and the other end is connected to a stop block 502. The stop block 502 is located in a limited space 503, and the limited space 503 blocks the movement of the stop block within a certain range.

[0029] In particular, the connection between the above-mentioned lever 501 and the channel support 5 is a rigid connection.

[0030] Preferably, the above-mentioned rigid connection can be an integral part of the channel support 5, which is part of the channel support 5 and is completed by one-time molding.

[0031] Preferably, the stop block 502 is made of high-hardness material; the installation and connection of the stop block 502 and the lever 501 are rigid connection.

[0032] Referring to the accompanying drawings Figure 7 As shown, the limited space 503 is a blocking structure 504, which is specifically a blocking block A5041 and a blocking block B5042, which can provide movement and limit the movement range of the stop block 502 in the front-back, up-down or left-right directions. Preferably, the blocking block A5041 and the blocking block B5042 can be made of high-hardness material.

[0033] In particular, the channel impact mechanism 50 has different designs: Embodiment

[0034] Referring to the accompanying drawings Figure 7As shown, the channel impact mechanism 50 can also be a part of a body 53 on the bracket, which protrudes from the base material of the bracket; the body 53 can also move with the channel bracket 5 within a limited range, and the movement is stopped or changed in direction by the impact of the body 53 with the stopper 5043.

[0035] Preferably, the stopper 5043 can be provided by other structural components of the sensor outside the channel mechanism.

[0036] Preferably, the body 53 is made of a high-hardness material, which can be assembled with the channel bracket 5 or embedded in the mold during mold forming.

[0037] The channel bracket 5 is made of a high-molecular material, such as an engineering plastic, by mold injection forming, which can be one-time forming or multi-time forming and then assembled.

[0038] Preferably, the material of the channel bracket 5 is selected to have as large a specific gravity as possible, so that the specific gravity of the entire channel bracket 5 is greater than that of urea. It is particularly stated that all other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

Claims

1. An ultrasonic flight channel structure for purifying liquid media, characterized in that, It includes an ultrasonic probe cover (1), an ultrasonic wave reflection cover (2), a dirt filter (3), a channel exhaust mechanism (4), and a channel support (5); the ultrasonic probe cover (1) is a fabric that is in close contact with the ultrasonic probe emitting surface without gaps; the ultrasonic wave reflection cover (2) is a fabric that is in close contact with the ultrasonic wave reflecting surface without gaps; the dirt filter (3) is a filter mesh structure; the ultrasonic probe cover (1), the ultrasonic wave reflection cover (2), the dirt filter (3), and the channel support (5) together form a cavity structure (51), which is the flight space of the ultrasonic wave.

2. According to claim 1, an ultrasonic flight channel structure for purifying liquid media is characterized in that, The channel exhaust mechanism (4) is a hollow pipe mechanism, with one end of the pipe being an inlet (41) that connects to the cavity structure (51) and the other end being an outlet (42).

3. According to claim 1, an ultrasonic flight channel structure for purifying liquid media, characterized in that, The channel support (5) is a rigid structure that connects and integrates the ultrasonic probe covering surface (1), ultrasonic reflection covering surface (2), dirt filtering surface (3), channel impact mechanism (50), and channel exhaust mechanism (4).

4. According to claim 3, an ultrasonic flight channel structure for purifying liquid media, characterized in that, The connection between the channel impact mechanism (50) and the channel support (5) is rigid, and the rigid connection also provides a solid 53 as a stop block; the stop block (502) is located in a defined space (503), which is realized by a blocking mechanism 504, which consists of a stop block or several stops.

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