Protective structure of quality sensor

Abstract

The utility model provides a quality sensor protection structure comprising a sensor body and a protection cover, the sensor body is provided with a reflection piece, the reflection piece is internally provided with a detection area, and the reflection piece is provided with a first opening communicated with the lower part of the detection area and a second opening communicated with the upper part of the detection area; the protective cover is arranged on the reflecting part in a sleeving mode and covers the second opening, a first hole channel and a second hole channel are formed in the top of the protective cover, the first hole channel and the second hole channel are adjacently arranged, and a communicating notch is formed between the upper side wall of the first hole channel and the upper side wall of the second hole channel. The second hole channel, the communicating notch and the first hole channel are sequentially communicated to form an exhaust liquid inlet flow channel, the first hole channel is communicated with the second opening, and the second hole channel is communicated with the outside. The protection structure of the quality sensor can reduce bubble interference in a detection area and improve the detection accuracy of the sensor body on a solution in the detection area.

Description

Technical Field

[0001] The utility model relates to the technical field of urea sensors, in particular to a protective structure of a quality sensor. Background Art

[0002] The National VI automotive urea solution complies with the national standard GB29518-2013 (concentration standard is 32.5% ± 1.5%), and a urea quality sensor is required to detect the quality (i.e. concentration) of the automotive urea solution in the vehicle. Currently, the technology for detecting urea quality on the market mainly uses ultrasonic technology. Ultrasonic waves have different propagation speeds in different media and different liquid concentrations. The urea quality sensor transmits and receives ultrasonic waves through a probe, calculates the round-trip time of ultrasonic waves in a fixed distance in the liquid, and compares the difference in time to obtain the difference in liquid concentration, thereby determining whether it is compliant urea. However, in ultrasonic detection, if there are bubbles gathering on the emitting surface and the reflecting surface or a large number of bubbles in the detection area, the ultrasonic detection will be interfered with, and the real-time data of the solution to be detected cannot be accurately captured.

[0003] Therefore, it is necessary to provide a protective structure for a quality sensor that can reduce bubble interference. Utility Model Content

[0004] The utility model aims to provide a protective structure of a quality sensor which can reduce the interference of bubbles.

[0005] To achieve the above-mentioned purpose, the utility model provides a protective structure of a quality sensor, including a sensor body and a protective cover, wherein a reflector is provided on the sensor body, a detection area is provided in the reflector, and the reflector is provided with a first opening connected to the lower part of the detection area and a second opening connected to the upper part of the detection area; the protective cover is sleeved on the reflector and covers the second opening, a first channel and a second channel are provided on the top of the protective cover, and the first channel and the second channel are arranged adjacent to each other, a connecting notch is provided between the upper side wall of the first channel and the upper side wall of the second channel, the second channel, the connecting notch and the first channel are connected in sequence to form an exhaust and liquid inlet channel, and the first channel is connected to the second opening, and the second channel is connected to the outside.

[0006] Preferably, a diversion and drainage hole communicating with a side wall of the second channel is provided on the top of the protective cover.

[0007] Preferably, the height of the diversion and drainage hole in the up-down direction is lower than the height of the connecting notch in the up-down direction.

[0008] Preferably, the protective cover includes a protective cover body and a protective cover cover, the protective cover body is sleeved on the reflector, the top of the protective cover body is provided with an exhaust and liquid inlet part, and the first channel, the connecting notch and the second channel are respectively arranged on the exhaust and liquid inlet part.

[0009] Preferably, the protective cover is connected to the protective cover body, and the top of the protective cover is provided with an exhaust and liquid inlet hole located above the second hole and connected to the second hole, and the exhaust and liquid inlet hole is connected to the outside.

[0010] Preferably, the bottom of the protective cover body is provided with a through hole connected to the first opening, the bottom of the protective cover covers the through hole and has a micro-gap channel between the bottom of the protective cover body, and the micro-gap channel connects the through hole with the outside.

[0011] Preferably, the bottom of the protective cover body is provided with a plurality of positioning protrusions located around the through hole, and the bottom of the protective cover is located below the positioning protrusions and abuts against the positioning protrusions.

[0012] Preferably, the positioning protrusions are arranged on the bottom of the protective cover body in a staggered manner.

[0013] Preferably, the bottom of the protective cover body and the bottom of the protective cover are fixed by a snap-fit ​​structure.

[0014] Preferably, the reflective member is provided with a protrusion, the protective cover body is provided with a spring sheet, the spring sheet is provided with a positioning hole, and the protrusion is engaged in the positioning hole.

[0015] Compared with the prior art, the protective structure of the quality sensor of the utility model is provided with a protective cover, which is sleeved on the reflective part of the sensor body, so as to achieve the purpose of covering the detection area inside the reflective part after the protective cover is assembled with the sensor body, isolating the solution outside the detection area from directly entering the detection area through the second opening, and preventing the detection from being disturbed due to the solution containing bubbles directly contacting the emitting surface of the sensor body and the reflective surface of the reflective part through the second opening; and the top of the protective cover is provided with a first channel, a connecting notch and a second channel, and the second channel, the connecting notch and the first channel are connected in sequence An exhaust liquid inlet flow channel is formed, and the solution can enter the exhaust liquid inlet flow channel from the second channel on the top of the protective cover. If there are bubbles in the solution, the solution will be restricted by the inner wall of the second channel, so the solution with bubbles will first converge at the bottom of the second channel, avoiding the solution with bubbles from directly entering the detection area. When the liquid level of the subsequent bubble-free solution rises to the position of the connecting gap, it can enter the detection area through the connecting gap and the first channel, thereby reducing the bubble interference in the detection area, so as to facilitate the effective monitoring of the sensor body, and effectively improve the detection accuracy of the sensor body for the solution in the detection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of the protective structure of the quality sensor of the utility model.

[0017] Figure 2 It is a cross-sectional view of the protective structure of the quality sensor of the utility model.

[0018] Figure 3 It is an exploded view of the protective structure of the quality sensor of the utility model.

[0019] Figure 4 It is a partial structural diagram of the protective structure of the quality sensor of the utility model.

[0020] Figure 5 yes Figure 4 Magnified view of point A in .

[0021] Figure 6 It is a cross-sectional view of the protective structure of the quality sensor of the utility model from another angle.

[0022] Figure 7 The utility model is a diagram showing the matching structure of a protective cover body and a protective cover cover of the protective structure of a quality sensor.

[0023] Figure 8 It is a structural diagram when a solution enters a detection area from a micro-gap channel of a protective structure of a quality sensor of the utility model.

[0024] Fig. 9It is a structural diagram when the solution enters the detection area from the exhaust liquid inlet hole of the protective structure of the quality sensor of the utility model.

[0025] Fig.10 It is a structural diagram when the solution enters the detection area from the diversion and drainage hole of the protective structure of the quality sensor of the utility model. DETAILED DESCRIPTION

[0026] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0027] See also Figures 1 to 5 The protective structure 100 of the quality sensor of the utility model comprises a sensor body 1 and a protective cover 2. The sensor body 1 is provided with a reflector 11, and a detection area 111 is provided in the reflector 11. The reflector 11 is provided with a first opening 112 communicating with the lower part of the detection area 111 and a second opening 113 communicating with the upper part of the detection area 111; the protective cover 2 is sleeved on the reflector 11 and covers the second opening 113. The top of the protective cover 2 is provided with a first channel 213a1 and a second channel 213a2. The first hole 213a1 and the second hole 213a2 are arranged adjacent to each other, a communication notch 213a3 is provided between the upper side wall of the first hole 213a1 and the upper side wall of the second hole 213a2, the second hole 213a2, the communication notch 213a3 and the first hole 213a1 are sequentially connected to form an exhaust and liquid inlet flow channel 213a, and the first hole 213a1 is connected to the second opening 113, and the second hole 213a2 is connected to the outside. Specifically, the first hole 213a1 and the second hole 213a2 are arranged in the up-down direction, the lower end of the first hole 213a1 is connected to the second opening 113, and the upper end of the second hole 213a2 is connected to the outside, but it is not limited thereto.

[0028] Among them, the solution can enter the exhaust and liquid inlet channel 213a from the second channel 213a2 on the top of the protective cover 2. If there are bubbles in the solution, and because the solution will be restricted by the inner wall of the second channel 213a2, the solution with bubbles will first converge in the second channel 213a2. In the process of bubble convergence, small bubbles will aggregate into large bubbles. Large bubbles are more likely to float to the liquid surface and then burst due to their greater buoyancy, thereby allowing the gas in the solution to escape to the outside, preventing the solution with bubbles from directly entering the detection area 111. When the liquid level of the subsequent bubble-free solution rises to the position of the connecting gap 213a3, it can enter the detection area 111 through the connecting gap 213a3 and the first channel 213a1, thereby reducing the bubble interference in the detection area 111, so as to facilitate the effective monitoring of the sensor body 1, and effectively improve the detection accuracy of the sensor body 1 on the solution in the detection area 111.

[0029] Please continue reading Figures 1 to 5 The protective cover 2 includes a protective cover body 21 and a protective cover cover 22. The protective cover body 21 is sleeved on the reflector 11. The top of the protective cover body 21 is provided with an exhaust liquid inlet portion 213. The first channel 213a1, the connecting notch 213a3 and the second channel 213a2 are respectively arranged on the exhaust liquid inlet portion 213. The protective cover cover 22 is connected to the protective cover body 21. The top of the protective cover cover 22 is provided with an exhaust liquid inlet hole 221 located above the second channel 213a2 and connected to the second channel 213a2, and the exhaust liquid inlet hole 221 is connected to the outside. Specifically, the second channels 213a2 are provided on both sides of the first channel 213a1, and a connecting notch 213a3 is provided between each second channel 213a2 and the first channel 213a1. The number of the exhaust liquid inlet holes 221 is the same as the number of the second channels 213a2, and the exhaust liquid inlet holes 221 correspond to the second channels 213a2 one by one, but it is not limited thereto. More specifically, the upper ends of the first hole 213a1 and the second hole 213a2 are both open, and the top of the protective cover 22 is located above the exhaust and liquid inlet portion 213 and covers the upper ends of the first hole 213a1 and the second hole 213a2, but is not limited thereto.

[0030] See also Figure 4 and Figure 5 The top of the protective cover 2 is provided with a drainage hole 213b connected to the side wall of the second channel 213a2. Specifically, the drainage hole 213b is arranged on the outer wall of the exhaust and liquid inlet portion 213, and the drainage hole 213b connects the second channel 213a2 with the outside. Further, the height of the drainage hole 213b in the vertical direction is lower than the height of the connecting notch 213a3 in the vertical direction, but it is not limited thereto.

[0031] When the solution enters from the exhaust inlet 221 at the top (in this case, it usually enters from the exhaust inlet 221 when the solution is added or the solution is shaken and splashed, and the solution contains more bubbles when the solution is added or the solution is shaken and splashed), the solution with bubbles first enters the second channel 213a2 downward from the exhaust inlet 221. Since the solution is restricted by the inner wall of the second channel 213a2, a large amount of solution can only be directly discharged from the side guide and drainage hole 213b, and only a small amount of solution enters the first channel 213a1 from the connecting notch 213a3 at the upper part of the second channel 213a2, and then flows out from the first channel 213a2. 3a1 enters the detection area 111, which can prevent a large number of bubbles from entering the detection area 111 and interfering with the detection; when the solution enters the detection area 111 from the side diversion and drainage hole 213b, the solution needs to submerge the lower position of the connecting gap 213a3 corresponding to the second channel 213a2, so that the solution can enter the connecting gap 213a3. If the solution contains bubbles, when the solution enters the second channel 213a2 from the side diversion and drainage hole 213b, the solution containing bubbles will hit the inner wall of the second channel 213a2, and the small bubbles in the solution will gather into large bubbles, and then be discharged through the exhaust inlet hole 221 above.

[0032] See also Figure 2 and Figure 4 The bottom of the protective cover body 21 is provided with a through hole 211 connected to the first opening 112, the protective cover cover 22 is connected to the protective cover body 21, the bottom of the protective cover cover 22 blocks the through hole 211 and has a micro-gap channel 23 with the bottom of the protective cover body 21, and the micro-gap channel 23 connects the through hole 211 with the outside.

[0033] Among them, the protective cover body 21 of the protective cover 2 is sleeved on the reflective member 11 of the sensor body 1, so as to achieve the purpose of covering the detection area 111 inside the reflective member 11 after the protective cover 2 is assembled with the sensor body 1, and the solution outside the detection area 111 is isolated from directly entering the detection area 111 through the first opening 112 or the second opening 113, so as to prevent the detection from being disturbed due to the solution containing bubbles directly contacting the emitting surface of the sensor body 1 and the reflective surface of the reflective member 11; and the protective cover 2 is divided into two parts, namely, the protective cover body 21 and the protective cover cover 22. The protective cover cover 22 is assembled with the protective cover body 21, and the micro-gap channel 23 formed between the bottom of the protective cover cover 22 and the bottom of the protective cover body 21 is used for the solution to flow in, so that the solution can enter the detection area 111 through the first opening 112. At the same time, the micro-gap channel 23 can block and intercept the interfering bubbles in the solution, so as to reduce the bubble interference in the detection area 111 and improve the detection accuracy of the sensor body 1 on the solution in the detection area 111.

[0034] See also Figure 3and Figure 4 , the bottom of the protective cover body 21 is provided with a plurality of positioning convex points 212 located on the periphery of the perforation 211, and the bottom of the protective cover cover 22 is located below the positioning convex points 212 and abuts against the positioning convex points 212. By providing the positioning convex points 212, the size of the micro-gap channel 23 between the bottom of the protective cover cover 22 and the bottom of the protective cover body 21 is limited, and at the same time, the bottom of the protective cover cover 22 and the bottom of the protective cover body 21 are prevented from being affixed to each other to cause the micro-gap channel 23 to be blocked. Specifically, in the present embodiment, the number of the positioning convex points 212 is four, and the positioning convex points 212 are distributed on both sides of the perforation 211, but it is not limited thereto. In some other embodiments, each positioning convex point 212 is arranged on the bottom of the protective cover body 21 in a staggered manner. By arranging each positioning convex point 212 in a staggered manner, bubbles mixed in the solution can be blocked, and the interference caused by the mixed bubbles in the solution to the ultrasonic detection of the sensor body 1 can be reduced. More specifically, the positioning convex points 212 can be square points or round points. The bottom of the protective cover 22 and the positioning protrusion 212 fit tightly after assembly.

[0035] Among them, Figure 8 As shown, combined with Figure 4 and Figure 5 When the solution enters the detection area 111 from the micro-gap channel 23 at the bottom, the air in the detection area 111 can be discharged through the first channel 213a1, the connecting gap 213a3, the second channel 213a2 and the exhaust and liquid inlet hole 221 in sequence.

[0036] See also Figure 1 and Figure 6 In this embodiment, the bottom of the protective cover body 21 and the bottom of the protective cover cover 22 are fixed by a buckle structure 24, so that the connection between the protective cover body 21 and the protective cover cover 22 is detachable, but the present invention is not limited thereto. The buckle structure 24 can be arranged on the bottom of the protective cover body 21, and the protective cover body 21 is clamped on the protrusion of the protective cover cover 22 by the buckle structure 24, so that the protective cover body 21 and the protective cover cover 22 are firmly connected together, preventing the protective cover cover 22 from withdrawing in the front-back direction, and at the same time, preventing the protective cover cover 22 from bouncing to the bottom.

[0037] See also Figure 1In this embodiment, a projection 114 is provided on the reflector 11, and a spring piece 214 is provided on the shield body 21. A positioning hole 214a is provided on the spring piece 214, and the projection 114 is engaged in the positioning hole 214a. By providing the projection 114 on the reflector 11, the shield body 21 is positioned on the reflector 11 by using the projection 114. Specifically, the spring piece 214 can be arranged along the circumferential direction of the shield body 21, so that the shield body 21 and the reflector 11 are connected at multiple positions, thereby improving the stability of the connection, and the spring piece 214 and the reflector 11 are designed to fit.

[0038] See also Figure 7 In this embodiment, a positioning groove 215 is provided on the protective cover body 21, and the end of the protective cover cover 22 is inserted into the positioning groove 215. When the protective cover cover 22 is sleeved on the protective cover body 21, the end of the protective cover cover 22 is inserted into the positioning groove 215 of the protective cover body 21, thereby preventing the end of the protective cover cover 22 from warping. At the same time, the protective cover cover 22 is inserted and positioned through the positioning groove 215, which can prevent the protective cover cover 22 from being misaligned relative to the protective cover body 21, and can also facilitate the alignment and assembly between the protective cover body 21 and the protective cover cover 22.

[0039] In summary, the protective structure 100 of the quality sensor of the utility model is provided with a protective cover 2, and the protective cover body 21 of the protective cover 2 is sleeved on the reflective member 11 of the sensor body 1, so as to achieve the purpose of covering the detection area 111 inside the reflective member 11 after the protective cover 2 and the sensor body 1 are assembled, and the solution outside the detection area 111 is isolated from directly entering the detection area 111 through the first opening 112 or the second opening 113, so as to prevent the detection from being interfered by the solution containing bubbles directly contacting the emitting surface of the sensor body 1 and the reflecting surface of the reflective member 11. Disturbance; and the protective cover 2 is designed as two parts of a protective cover body 21 and a protective cover cover 22. The protective cover cover 22 is assembled with the protective cover body 21, and a micro-gap channel 23 formed between the bottom of the protective cover cover 22 and the bottom of the protective cover body 21 is used for solution to flow in, so that the solution can enter the detection area 111 through the first opening 112. At the same time, the micro-gap channel 23 can block and intercept interfering bubbles in the solution, thereby reducing the bubble interference in the detection area 111 and improving the detection accuracy of the sensor body 1 on the solution in the detection area 111. In addition, an exhaust liquid inlet channel 213a is provided in the exhaust liquid inlet portion 213 at the top of the protective cover body 21, and the exhaust liquid inlet channel 213a is designed to be a structure of a first channel 213a1, a connecting notch 213a3 and a second channel 213a2 connected and combined. At the same time, an exhaust liquid inlet hole 221 is provided at a position above the second channel 213a2 of the protective cover 22, and a guide and drainage hole 213b is provided on the outer wall of the exhaust liquid inlet portion 213. First, the air in the detection area 111 can be exhausted through the exhaust liquid inlet channel 213a and the exhaust liquid inlet hole 221 at the top, and then Liquid can also be inletted from the top through the exhaust liquid inlet hole 221 and the exhaust liquid inlet channel 213a at the top. Furthermore, liquid can be inletted through the diversion and drainage hole 213b on the side of the top, so that the bubbles entrained in the solution can be gathered in the second channel 213a2 and discharged from the exhaust liquid inlet hole 221, and the solution can enter the detection area 111 through the second channel 213a2, the connecting gap 213a3 and the first channel 213a1, further blocking and intercepting the interfering bubbles in the solution, thereby reducing the bubble interference in the detection area 111 and improving the detection accuracy of the sensor body 1 on the solution in the detection area 111.

[0040] The above disclosure is only a preferred example of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. A protective structure for a quality sensor, characterized in that: include: A sensor body, wherein a reflector is disposed on the sensor body, a detection area is disposed in the reflector, and the reflector is provided with a first opening communicating with a lower portion of the detection area and a second opening communicating with an upper portion of the detection area; A protective cover, wherein the protective cover is sleeved on the reflector and covers the second opening, a first channel and a second channel are provided on the top of the protective cover, and the first channel and the second channel are arranged adjacent to each other, a connecting gap is provided between the upper side wall of the first channel and the upper side wall of the second channel, the second channel, the connecting gap and the first channel are connected in sequence to form an exhaust and liquid inlet channel, and the first channel is connected to the second opening, and the second channel is connected to the outside.

2. The protective structure of the quality sensor according to claim 1, characterized in that: The top of the protective cover is provided with a diversion and drainage hole which is communicated with the side wall of the second channel.

3. The protective structure of the quality sensor according to claim 2, characterized in that: The height of the diversion and drainage hole in the up-down direction is lower than the height of the connecting notch in the up-down direction.

4. The protective structure of the quality sensor according to claim 1, characterized in that: The protective cover comprises a protective cover body and a protective cover cover. The protective cover body is sleeved on the reflector. An exhaust and liquid inlet portion is provided on the top of the protective cover body. The first channel, the connecting notch and the second channel are respectively arranged on the exhaust and liquid inlet portion.

5. The protective structure of the quality sensor according to claim 4, characterized in that: The protective cover is connected to the protective cover body, and a gas exhaust and liquid inlet hole is provided on the top of the protective cover, which is located above the second hole and communicated with the second hole, and the gas exhaust and liquid inlet hole is communicated with the outside.

6. The protective structure of the quality sensor according to claim 4, characterized in that: The bottom of the protective cover body is provided with a through hole connected to the first opening, the bottom of the protective cover covers the through hole and has a micro-gap channel between the bottom of the protective cover body, and the micro-gap channel connects the through hole with the outside.

7. The protective structure of the quality sensor according to claim 6, characterized in that: The bottom of the protective cover body is provided with a plurality of positioning protrusions located around the through hole, and the bottom of the protective cover is located below the positioning protrusions and abuts against the positioning protrusions.

8. The protective structure of the quality sensor according to claim 7, characterized in that: The positioning protrusions are arranged on the bottom of the protective cover body in a staggered manner.

9. The protective structure of the quality sensor according to claim 4, characterized in that: The bottom of the protective cover body and the bottom of the protective cover cover are fixed by a buckle structure.

10. The protective structure of the quality sensor according to claim 4, characterized in that: The reflector is provided with a protrusion, the protective cover body is provided with a spring sheet, the spring sheet is provided with a positioning hole, and the protrusion is engaged in the positioning hole.

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