A solution detection sensor

Abstract

The present invention belongs to the technical field of solution detection, and discloses a solution detection sensor. The solution detection sensor includes a housing member and a middle body. The housing member includes an outer layer body, and the outer layer body is provided with an outer layer hole. The middle body is disposed inside the outer layer body, and a reflux buffer zone is formed between the inner wall of the outer layer body and the outer wall of the middle body. The middle body is provided with a middle layer hole, and the outer layer hole, the reflux buffer zone and the middle layer hole communicate to form a tortuous outflow channel. A detection area is formed inside the middle body, the outflow channel is connected to the detection area, and a detection element is disposed in the detection area. The reflux buffer zone of the present invention can buffer and staticize the solution, avoid the solution directly impacting the detection area, and ensure the detection accuracy of the solution detection sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of solution detection, and particularly relates to a solution detection sensor. Background Art

[0002] At present, the detection areas of solution detection sensors on the market are directly exposed or protected by filters, such as ultrasonic sensors, laser sensors, etc. When the detection area is exposed, the detection area is easily directly impacted by the filled solution or affected by the shaking of the solution during vehicle operation. The bubbles and foreign objects generated by the solution shock caused by the filled solution or the shaking of the solution will affect the signal processing of ultrasonic waves or lasers, making the measured value inaccurate; when using a filter, too large mesh holes will result in poor protection effect, and too small mesh holes will cause the bubbles at the sound source detection or laser detection to not be completely discharged, affecting the detection of the solution by ultrasonic waves or lasers. Summary of the Invention

[0003] An object of the present invention is to provide a solution detection sensor, enabling the solution to be buffered and statically settled in the reflux buffer area, avoiding the direct impact of the solution on the detection area, and ensuring the detection accuracy of the solution detection sensor.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A solution detection sensor, comprising:

[0006] A housing member, the housing member includes an outer layer body, and the outer layer body is provided with an outer layer hole;

[0007] A middle layer body, disposed inside the outer layer body, a reflux buffer area is formed between the inner wall of the outer layer body and the outer wall of the middle layer body, the middle layer body is provided with a middle layer hole, the outer layer hole, the reflux buffer area and the middle layer hole communicate to form a tortuous outflow channel, a detection area is formed inside the middle layer body, the outflow channel is connected to the detection area, and a detection element is disposed in the detection area.

[0008] As an optional technical solution, the middle layer body includes an arc segment, and the arc segment corresponds to the outer layer hole.

[0009] As an optional technical solution, the outer layer hole includes a first outer layer hole and a second outer layer hole respectively disposed on both sides of the top of the outer layer body, the arc segment includes an upper arc segment, the upper arc segment is concave, and the concave surface of the upper arc segment faces the first outer layer hole and the second outer layer hole.

[0010] As an alternative technical solution, the middle layer body further includes a side segment connected to the upper arc segment. The middle layer holes include a first middle layer hole and a second middle layer hole. The first middle layer hole is located at the junction of the side segment and the upper arc segment, and the second middle layer hole is located in the middle of the side segment.

[0011] As an alternative technical solution, one end of the side segment close to the first middle layer hole is concavely arranged, and the concave surface of the side segment faces the outer layer body.

[0012] As an alternative technical solution, the solution detection sensor further includes an inner shell member. The inner shell member is arranged inside the middle layer body. The detection area is formed inside the inner shell member, and the inner shell member is provided with an inner flow channel connecting the detection area and the outer flow channel.

[0013] As an alternative technical solution, the outer layer hole further includes a third outer layer hole arranged at the bottom of the outer layer body. The arc segment further includes a lower arc segment which is convexly arranged, and the convex surface of the lower arc segment faces the third outer layer hole.

[0014] As an alternative technical solution, the inner flow channel includes a lower inner flow channel hole which is located at the bottom of the inner shell member, and a filter element is arranged between the lower inner flow channel hole and the third outer layer hole.

[0015] As an alternative technical solution, the filter element is a filter screen or a brush.

[0016] As an alternative technical solution, the outer shell member includes a first outer shell and a second outer shell. The first outer shell and the second outer shell cover the outside of the inner shell member. One of the first outer shell and the second outer shell is provided with a card slot, and the other is provided with an elastic buckle which is snap-fitted in the card slot.

[0017] As an alternative technical solution, a shrapnel is arranged in the outer flow channel, and the shrapnel is used to buffer or block the solution entering the detection area from the outer flow channel.

[0018] As an alternative technical solution, a threaded post is arranged on the outer wall of the outer shell member, and the threaded post is used for threaded connection with a threaded fastener to limit the position of the solution detection sensor.

[0019] As an alternative technical solution, a exhaust pipe with a preset length is further arranged at the top of the outer layer body, and the exhaust pipe is connected to the outer layer hole.

[0020] The beneficial effects of the present invention are as follows:

[0021] A solution detection sensor provided by the present invention is used to detect the components of a solution. After the solution detection sensor is placed in the solution, the solution sequentially passes through the outer layer holes, the reflux buffer zone, and the middle layer holes, and finally reaches the detection zone. The detection element detects the solution in the detection zone. Since the solution is buffered and static in the reflux buffer zone, the flow rate of the solution flowing into the detection zone finally becomes slower, the impact force of the solution weakens, and the bubbles carried by the solution become fewer, ensuring the reliability of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below with reference to the drawings and embodiments;

[0023] Figure 1 Front view of the solution detection sensor described in Embodiment 1;

[0024] Figure 2 Front cross-sectional view of the solution detection sensor (the filter element is a filter screen) described in Embodiment 1;

[0025] Figure 3 For Figure 2 Cross-sectional view of the A-A cross-section in

[0026] Figure 4 For Figure 2 Cross-sectional view of the B-B cross-section in

[0027] Figure 5 Front cross-sectional view of another solution detection sensor (the filter element is a brush) described in Embodiment 1;

[0028] Figure 6 Left cross-sectional view of the solution detection sensor described in Embodiment 2;

[0029] Figure 7 For Figure 6 Partial enlarged view at position C in

[0030] Figure 8 Another left cross-sectional view of the solution detection sensor described in Embodiment 2;

[0031] Figure 9 For Figure 8 Partial enlarged view at position D in

[0032] Figure 10 Front view of the solution detection sensor described in Embodiment 3.

[0033] In the figure:

[0034] 100, housing part; 101, reflux buffer zone; 102, first housing; 103, second housing; 104, retaining wall; 200, inner housing part; 201, detection zone; 202, upper internal flow channel hole; 203, lower internal flow channel hole; 300, liquid inlet.

[0035] 1. Outer body; 11. First outer hole; 12. Second outer hole; 13. Third outer hole; 14. First elastic piece; 15. Third elastic piece; 16. Elastic buckle; 17. Fourth outer hole; 18. Fifth outer hole;

[0036] 2. Middle body; 21. Upper arc segment; 22. Side segment; 23. First middle hole; 24. Second middle hole; 25. Lower arc segment;

[0037] 3. Filter element;

[0038] 4. Threaded post;

[0039] 5. Exhaust pipe. Detailed implementation manners

[0040] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0041] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0043] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., referring to orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying operations, rather than indicating or implying that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0044] In the description of this specification, the description referring to terms such as "one embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments.

[0046] Embodiment 1:

[0047] As Figures 1 to 5 shown, this embodiment provides a solution detection sensor that can be used to detect various liquids, analyze the composition and concentration of the liquids, such as gasoline, diesel, hydraulic fluid, transmission fluid, and urea solution, etc. It can also be used in combination with other components, which is not limited herein. Taking the solution detection sensor placed in the urea tank for detection as an example.

[0048] The solution detection sensor includes a housing member 100 and a middle body 2. The housing member 100 includes an outer body 1, and the outer body 1 is provided with an outer hole; the middle body 2 is disposed inside the outer body 1, and a reflux buffer zone 101 is formed between the inner wall of the outer body 1 and the outer wall of the middle body 2. The middle body 2 is provided with a middle hole, and the outer hole, the reflux buffer zone 101, and the middle hole communicate to form a tortuous outflow channel. A detection zone 201 is formed inside the middle body 2, and the outflow channel is connected to the detection zone 201. A detection element is disposed in the detection zone 201.

[0049] In this embodiment, the solution detection sensor further includes an inner housing member 200. The inner housing member 200 is disposed inside the middle body 2, the detection zone 201 is formed inside the inner housing member 200, and the inner housing member 200 is provided with an inner flow channel that connects the detection zone 201 and the outflow channel. In some other embodiments, the cavity inside the middle body 2 directly forms the detection zone 201, and the detection element performs detection in the detection zone 201.

[0050] In this embodiment, the outer holes and the middle holes are arranged in a dislocation manner. For example, the height of the outer holes in the Z-axis direction is not equal to the height of the middle holes in the Z-axis direction; or, the position of the outer holes in the X-axis direction is not equal to the position of the middle holes in the X-axis direction. The solution enters from the outer holes, flows to the reflux buffer zone 101, then passes through the inner flow channel from the middle holes, and reaches the detection zone 201 after buffering and standing still. In some other embodiments, the outer holes and the middle holes are located at the same horizontal position and the reflux buffer zone 101 is bent to prevent the solution from directly entering the detection zone 201 from the middle holes after passing through the outer holes.

[0051] Place the solution detection sensor of this embodiment in the solution. The solution sequentially passes through the outer holes, the reflux buffer zone 101, the middle holes, and the inner flow channel, and finally reaches the detection zone 201. The detection element detects the solution in the detection zone 201. Since the solution is buffered and standing still in the reflux buffer zone 101, the flow rate of the solution finally flowing into the detection zone 201 becomes slower, so that the bubbles carried by the solution have enough time to stand still in the reflux buffer zone 101. During the standing still process, the larger bubbles directly float upward by their own buoyancy and are discharged from the outer holes without passing through the middle holes into the detection zone 201, while the fine bubbles gather with each other to form large bubbles during the standing still, and then also float upward by their own buoyancy and are discharged to the outside from the outer holes. The number of fine bubbles entering the detection zone 201 is greatly reduced, reducing the influence of fine bubbles on the detection; and the impact force of the solution is weakened, slowing down the impact of the solution on the detection zone 201, and the bubbles generated by the impact also correspondingly decrease, while ensuring the stability of the solution in the detection zone 201 and ensuring the reliability of the detection result. The outer holes of this embodiment can allow the solution to flow in, and can also discharge the solution and bubbles.

[0052] The detection element can be selected as an ultrasonic detection element or a laser detection element. The ultrasonic detection element and the laser detection element are both prior arts, and will not be elaborated in this embodiment one by one.

[0053] In this embodiment, the outer body 1 and the middle body 2 are integrally formed, reducing the production cost. In some other embodiments, the middle body 2 and the inner shell member 200 are integrally formed.

[0054] Optionally, the middle body 2 includes an arc segment, and the arc segment is arranged corresponding to the outer holes. The arc segment can first shunt and buffer the solution entering the outer body 1, reducing the impact force of the solution.

[0055] Optionally, the outer holes include a first outer hole 11 and a second outer hole 12 respectively provided on both sides of the top of the outer body 1. The arc segment includes an upper arc segment 21 which is concavely arranged, and the concave surface of the upper arc segment 21 faces the first outer hole 11 and the second outer hole 12. Optionally, the number of both the first outer hole 11 and the second outer hole 12 can be set according to actual needs. For example, both the first outer hole 11 and the second outer hole 12 are set to one, or two, or three.

[0056] The outflow channel includes an upper outflow channel. The upper outflow channel is provided with two and is respectively located on both sides of the upper arc segment 21. The first outer hole 11 is the outer hole of one of the upper outflow channels, and the second outer hole 12 is the outer hole of the other upper outflow channel. The uses and working principles of the two upper outflow channels are the same. In this embodiment, one of the upper outflow channels is taken as an example. When the solution is in a high liquid level state, the solution in the urea tank shakes. The solution detection sensor is below the horizontal plane of the solution. Part of the solution flowing in from the first outer hole 11 flows to the reflux buffer area 101, and the other part flows along the concave surface of the upper arc segment 21 towards the second outer hole 12. The blocking of the upper arc segment 21 can directly buffer the flowing-in solution. And part of the solution flowing in from the second outer hole 12 flows along the concave surface of the upper arc segment 21 towards the first outer hole 11. The two parts of the solution flow in opposite directions on the concave surface of the upper arc segment 21, further weakening the impact force of the solution. When the solution is in a low liquid level state, the urea tank is filled with the solution, and the sputtered solution passes through the first outer hole 11 and falls into the concave surface of the upper arc segment 21, avoiding the solution with strong impact force and a large number of bubbles from directly falling into the detection area 201. When the concave surface of the upper arc segment 21 is filled with the solution, the solution will overflow into the reflux buffer area 101. The part of the overflowed solution is accumulated and statically settled on the concave surface of the upper arc segment 21. Therefore, the impact force of the solution overflowing into the reflux buffer area 101 is weakened and the amount of bubbles carried is greatly reduced.

[0057] Optionally, the middle layer body 2 further includes a side segment 22 connected to the upper arc segment 21. The middle layer holes include a first middle layer hole 23 and a second middle layer hole 24. The first middle layer hole 23 is located at the junction of the side segment 22 and the upper arc segment 21, and the second middle layer hole 24 is located at the lower part of the side segment 22. The height of the second middle layer hole 24 on the Z-axis is higher than the height of the reflux buffer zone 101. When the solution is at a low liquid level, the solution is filled into the urea tank. The solution that overflows from the concave surface of the upper arc segment 21 into the reflux buffer zone 101 accumulates and stands still again in the reflux buffer zone 101. The impact force generated when the solution overflows from the concave surface of the upper arc segment 21 into the reflux buffer zone 101 is buffered, and the fine bubbles generated by the impact are aggregated to form larger bubbles, and are discharged through the first outer hole 11 and / or the second outer hole 12. When the liquid level height of the solution accumulated in the reflux buffer zone 101 rises to the position of the second middle layer hole 24, the solution that has stood still in the reflux buffer zone 101 will overflow from the second middle layer hole 24 into the detection area 201; when the solution is at a high liquid level, the solution detection sensor is below the horizontal plane of the solution. If the solution outside the solution detection sensor vibrates, the vibrating solution may carry bubbles into the reflux buffer zone 101 through the first outer hole 11 and / or the second outer hole 12. The solution in the reflux buffer zone 101 may also generate bubbles due to vibration. Most of the bubbles in the solution can float up by their own buoyancy and be discharged to the outside through the first outer hole 11 and / or the second outer hole 12 in the reflux buffer zone 101, reducing the number of bubbles entering the detection area 201. A small number of fine bubbles follow the solution into the interior of the middle layer body 2 through the second middle layer hole 24. The solution passing through the second middle layer hole 24 is aggregated and squeezed, prompting the fine bubbles carried by this part of the solution to aggregate and form larger bubbles above the detection area 201. The larger bubbles float up through the first middle layer hole 23 and are discharged to the outside through the first outer hole 11 and / or the second outer hole 12. A small part of the solution passing through the second middle layer hole 24 passes through the internal flow channel into the detection area 201. Another large part of the solution passing through the second middle layer hole 24 and the bubbles rise and flow to the bottom of the upper arc segment 21. Since the surface of the upper arc segment 21 facing the interior of the middle layer body 2 is a convex surface, this convex surface can guide this part of the solution to pass through the first middle layer hole 23 in time and flow back into the upper outer flow channel.

[0058] In this embodiment, the first outer hole 11 and the second outer hole 12 are at the same horizontal height, and both the first middle layer hole 23 and the second middle layer hole 24 are below the first outer hole 11 and the second outer hole 12.

[0059] In some other embodiments, the side segment 22 is a flat plate structure. In this embodiment, one end of the side segment 22 close to the first middle layer hole 23 is recessed, and the concave surface of the side segment 22 faces the outer layer body 1. The middle layer body 2 includes two symmetrically arranged side segments 22, and the tops of the two side segments 22 are close to each other, and the opening is narrowed, so as to improve the speed of the solution passing through the first middle layer hole 23 and the exhaust speed. The upper side wall and the lower side wall of the second middle layer hole 24 are arranged in a vertical dislocation, and the lower side wall extends towards the side close to the detection area 201, and the upper side wall extends towards the side away from the detection area 201, so that the second middle layer hole 24 forms a diversion hole with an upward opening, ensuring that most of the solution and bubbles passing through the second middle layer hole 24 are guided upwards to the first middle layer hole 23.

[0060] Optionally, the outer layer hole further includes a third outer layer hole 13 provided at the bottom of the outer layer body 1, and the arc segment further includes a lower arc segment 25, and the lower arc segment 25 is convexly arranged, and the convex surface of the lower arc segment 25 faces the third outer layer hole 13.

[0061] The outflow channel includes a lower outflow channel. The lower outflow channel is provided with two and is respectively located on both sides of the lower arc segment 25. Both lower outflow channels are connected to the third outer layer hole 13. The uses and working principles of the two lower outflow channels are the same. In this embodiment, one of the lower outflow channels is taken as an example. Since the lower arc segment 25 is convexly arranged and the convex surface of the lower arc segment 25 faces the third outer layer hole 13, the solution flowing in from the third outer layer hole 13 is shunted and buffered after impacting on the lower arc segment 25. Part of the solution flows into one of the lower outflow channels, and the other part of the solution flows into the other lower outflow channel. After the two parts of the solution are buffered and left still in the lower outflow channel, they flow in opposite directions on the side of the lower arc segment 25 facing the inner housing member 200, weakening the impact force of the solution. Optionally, the number of the third outer layer holes 13 can be set according to actual needs, such as one, or two, or three.

[0062] Optionally, a baffle 104 is arranged between the upper outflow channel and the lower outflow channel, and the baffle 104 is connected between the inner wall of the outer layer body 1 and the outer wall of the middle layer body 2. The baffle 104 can separate the return buffer area 101 of the upper outflow channel from the return buffer area 101 of the lower outflow channel, preventing the solution overflowing from the concave surface of the upper arc segment 21 into the return buffer area 101 of the upper outflow channel from directly impacting into the return buffer area 101 of the lower outflow channel and avoiding generating a large number of bubbles in the return buffer area 101 of the lower outflow channel.

[0063] Optionally, the inner flow channel includes a lower inner flow channel hole 203, the lower inner flow channel hole 203 is located at the bottom of the inner shell 200, and a filter 3 is arranged between the lower inner flow channel hole 203 and the third outer layer hole 13. Since sediments are usually concentrated at the bottom of the solution, the sediments carried by the solution passing through the lower outer flow channel are more than the sediments carried by the solution passing through the upper outer flow channel. Therefore, the filter 3 is arranged between the lower inner flow channel hole 203 and the third outer layer hole 13, which can effectively filter the sediments and reduce the number of bubbles entering the detection area 201. Optionally, the filter 3 is a filter screen or a brush. The brush is densely composed of a large number of soft filaments, which can shake with the solution in the solution, and the soft filaments are staggered and overlapped with each other. The solution needs to pass through the brush to enter the detection area 201, so the sediments and bubbles are blocked, and the flexible filaments can puncture the bubbles or the bubbles adhere to the flexible filaments.

[0064] Optionally, the inner flow channel further includes an upper inner flow channel hole 202 , and the upper inner flow channel hole 202 is located at the top of the inner shell 200 .

[0065] The solution flowing in from the third outer hole 13 passes through the lower outer flow channel, the lower inner flow channel hole 203, the detection area 201 and the upper inner flow channel hole 202 in sequence, and can be finally discharged from the first outer hole 11 or the second outer hole 12. This part of the solution is buffered and left to stand still when passing through the lower outer flow channel, which weakens the impact force. The sediment carried when passing through the filter element 3 is filtered, and the bubbles entering the detection area 201 are reduced, thereby ensuring the purity of the solution flowing to the detection area 201 and the detection conditions of the detection element. Then, it flows out of the inner shell 200 from the upper inner flow channel hole 202 and merges with the solution flowing in from the second outer hole 12.

[0066] When the urea solution is first added to the urea tank or when the liquid level of the urea solution is lower than the detection sensor and the urea solution is normally added, the urea solution mainly enters the detection area 201 from the lower outer flow channel, specifically, mainly enters through the third outer hole 13 and sequentially passes through the lower outer flow channel and the lower inner flow channel hole 203 to enter the detection area 201. If the splashed solution falls on the first outer hole 11 and the second outer hole 12 during the filling process, the solution will enter through the first outer hole 11 and the second outer hole 12. Only when the solution in the reflux buffer 101 overflows the second middle hole 24, the solution will enter the detection area 201.

[0067] Optionally, the outer shell 100 includes a first outer shell 102 and a second outer shell 103, and the first outer shell 102 and the second outer shell 103 are covered on the outside of the inner shell 200. One of the first outer shell 102 and the second outer shell 103 is provided with a card slot, and the other of the two is provided with an elastic card buckle 16, which is snapped into the card slot.

[0068] In this embodiment, the first housing 102 includes a part of the outer layer body 1, and this part of the outer layer body 1 is preferably the upper part of the outer layer body 1; the second housing 103 includes another part of the outer layer body 1, and this part of the outer layer body 1 is preferably the lower part of the outer layer body 1, and the second housing 103 further includes the entire middle layer body 2. The first housing 102 and the second housing 103 are detachably connected by snap connection, which is convenient for product disassembly and assembly, and can replace or repair the inner housing part 200. In some other embodiments, the first housing 102 includes the entire outer layer body 1 and a part of the middle layer body 2, the second housing 103 includes another part of the middle layer body 2, or the first housing 102 includes the entire outer layer body 1 and the second housing 103 includes the entire middle layer body 2.

[0069] Optionally, the outer holes further include a fourth outer hole 17, and the fourth outer hole 17 is arranged on one side of the end of the upper arc segment 21, and the fourth outer hole 17 is located above the reflection / receiving surface of the end of the inner housing part 200.

[0070] Optionally, threaded posts 4 are provided on the outer wall of the housing part 100, and the threaded posts 4 are used for threaded connection with threaded fasteners to limit the position of the solution detection sensor. For example, when the solution detection sensor is installed at the bottom of the urea tank or on the urea sensor in the urea tank, bolts are used for threaded connection with the threaded posts 4, so as to ensure the installation stability of the solution detection sensor.

[0071] Embodiment Two:

[0072] As Figures 6 to 9 shown, the difference between this embodiment and Embodiment One is that a spring piece is arranged in the outflow channel of this embodiment, and the spring piece is used for buffering or blocking the solution entering the detection area 201 from the outflow channel.

[0073] Optionally, the elastic piece includes a first elastic piece 14 disposed in the upper outer flow channel. The connecting end of the first elastic piece 14 is connected to the inner wall of the outer layer body 1, and the free end of the first elastic piece 14 extends toward the side of the middle layer body 2. The connecting end of the first elastic piece 14 is the lower end, and the free end of the first elastic piece 14 is the upper end. A return buffer area 101 is formed between the first elastic piece 14 and the inner wall of the outer layer body 1. The elastic coefficient of the first elastic piece 14 is a first preset elastic value. In the normal state of the first elastic piece 14, a liquid inlet 300 is formed at an interval between the free end of the first elastic piece 14 and the outer wall of the middle layer body 2. In the blocked state of the first elastic piece 14, the free end of the first elastic piece 14 is deformed and abuts against the outer wall of the middle layer body 2, blocking the upper outer flow channel from the detection area 201, that is, the liquid inlet 300 is blocked. The solution flowing into the upper outer flow channel from the first outer layer hole 11 first undergoes static buffering in the return buffer area 101. When the impact force of the solution impacting the return buffer area 101 or the impact force of the solution in the return buffer area 101 due to vibration is greater than the first preset impact value, the first elastic piece 14 elastically deforms and switches from the normal state to the blocked state, thereby preventing the solution with a greater impact force from passing through the liquid inlet 300 and entering the detection area 201. And because the free end of the first elastic piece 14 is inclined upward, even if the solution with an impact force less than the first preset impact value flows back along the free end of the first elastic piece 14 from the return buffer area 101 and seeps into the liquid inlet 300, the impact force of this part of the flowing-back solution is also weakened. In summary, the first elastic piece 14 can buffer or block the solution entering the detection area 201 from the return buffer area 101.

[0074] Optionally, the free end of the first elastic piece 14 is located below the first middle layer hole 23, that is, the liquid inlet 300 is located below the first middle layer hole 23, so as to prevent the first elastic piece 14 from guiding the solution to pass through the first middle layer hole 23 and directly enter the inside of the middle layer body 2, affecting the detection accuracy of the detection element.

[0075] Optionally, the elastic piece further includes a second elastic piece, which is the lower part of the side section 22. The free end of the second elastic piece extends obliquely towards the side of the outer body 1, and the free end of the second elastic piece is located below the liquid inlet 300. The elastic coefficient of the second elastic piece is a second preset elastic value, and the elastic coefficient of the first elastic piece 14 is greater than that of the second elastic piece, that is, the first preset elastic value is greater than the second preset elastic value. When the second elastic piece is in the normal state, a second middle layer hole 24 is formed between the free end of the second elastic piece and the inner wall of the outer body 1 or the first elastic piece 14. The diameter of the second middle layer hole 24 is smaller than that of the liquid inlet 300, so that when the solution flows from the liquid inlet 300 to the second middle layer hole 24, the fine air bubbles remaining in the solution are convenient to aggregate into large air bubbles and float up. At the same time, the second elastic piece can further buffer the solution, so that the solution slowly enters the detection area 201. In another embodiment, the second elastic piece can also block the above-mentioned second middle layer hole 24 in the normal state. Specifically, in the normal state, the free end of the second elastic piece gently abuts against the inner wall of the outer body 1 or the first elastic piece 14, and when the solution enters from the liquid inlet 300, a gap is formed between the free end of the second elastic piece and the inner wall of the outer body 1 or the first elastic piece 14, that is, the second middle layer hole 24 is formed, so that the solution slowly enters the detection area 201; during the process that the solution enters from the liquid inlet 300 and exits from the second middle layer hole 24, the fine air bubbles remaining in the solution are also convenient to aggregate into large air bubbles and float up. At the same time, the second elastic piece can also further buffer the solution.

[0076] Optionally, the thickness of the first elastic piece 14 is greater than that of the second elastic piece, so the elastic coefficient of the first elastic piece 14 is greater than that of the second elastic piece.

[0077] Optionally, the elastic piece further includes a third elastic piece 15. The third elastic piece 15 is located in the lower outer flow channel. The connecting end of the third elastic piece 15 is connected to the inner wall of the outer body 1. The free end of the third elastic piece 15 is inclined towards one side of the lower arc segment 25. When the solution flows from the third outer hole 13 into the lower outer flow channel, the third elastic piece 15 is elastically deformed by the impact of the solution and abuts against the lower arc segment 25, blocking the lower outer flow channel from the detection area 201. Therefore, the solution with an impact force exceeding the maximum preset value cannot flow from the lower outer flow channel into the detection area 201, preventing the solution with a large impact force from entering the detection area 201 and disturbing the solution in the detection area, which may affect the detection of the detection element. In another embodiment, in the normal state, the free end of the third elastic piece 15 abuts against the lower arc segment 25, so that the third outer hole 13 and the lower inner flow channel hole 203 cannot be communicated, and thus the solution is not allowed to enter the detection area 201 from the third outer hole 13, but the solution in the detection area 201 is allowed to ooze out from the third outer hole 13. In this way, the vibration and impact of the external solution cannot disturb the solution in the detection area 201 through the third outer hole 13, while the vibration and impact of the solution in the detection area 201 can cause the free end of the third elastic piece 15 to open, that is, the free end of the third elastic piece 15 is deformed and there is a gap with the lower arc segment 25 to discharge the disturbed solution, so that the solution in the detection area 201 can quickly become stable.

[0078] Optionally, a fifth outer hole 18 is further provided on the side wall of the outer body 1. The fifth outer hole 18 is communicated with the third outer hole 13. When the solution flowing into the third outer hole 13 cannot pass through the lower outer flow channel to reach the detection area 201, this part of the solution can be discharged from the fifth outer hole 18. According to the principle of conservation of momentum, the impact of the solution on the overall solution detection sensor can be reduced, and the vibration of the overall solution detection sensor can be weakened. At the same time, if there are bubbles in the solution, because the bubbles are relatively light, the bubbles are preferentially discharged from the fifth outer hole 18, reducing the amount reaching the detection area 201.

[0079] Embodiment 3:

[0080] As Figure 10 shown, the difference between this embodiment and Embodiment 1 or Embodiment 2 is that a preset-length exhaust pipe 5 is further provided at the top of the outer body 1 in this embodiment, and the exhaust pipe 5 is communicated with the outer hole. The exhaust pipe 5 is communicated with the outer hole at the top of the outer body 1, and the specific number can be set according to actual needs. When the solution detection sensor is preferably installed away from the solution filling port, such as the urea tank filling port, the impact force of the solution is small. The exhaust pipe 5 can be connected to the outside or the set solution area outside the urea tank through a pipeline, or the length of the exhaust pipe 5 is greater than the depth of the set solution in the urea tank, so as to ensure that the gas in the solution detection sensor is directly discharged to the outside or outside the liquid level, and at the same time, it can also prevent the solution from carrying bubbles from flowing back into the inside of the solution detection sensor through the exhaust pipe 5.

[0081] Optionally, a plurality of outer holes are provided at intervals along the X-axis direction on the outer body 1, and a plurality of exhaust pipes 5 are provided. The exhaust pipes 5 are arranged in one-to-one correspondence with the outer holes, and the plurality of exhaust pipes 5 are arranged at different heights. When filling the urea tank with the solution, the liquid level in the urea tank gradually rises. The solution first penetrates into the interior of the solution detection sensor from the exhaust pipe 5 at the lowest height, and then penetrates into the solution detection sensor from the exhaust pipe 5 at the second lowest height, and so on, until the solution completely submerges all the exhaust pipes 5 or the urea tank is filled with the solution and cannot be filled continuously. Thus, the speed of the solution penetrating into the solution detection sensor can be slowed down, and the solution is prevented from penetrating into the solution detection sensor through multiple exhaust pipes 5 simultaneously.

[0082] In addition, the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A solution detection sensor, characterized in that, Comprising: A housing member (100), the housing member (100) includes an outer layer body (1), and the outer layer body (1) is provided with an outer layer hole; A middle layer body (2), disposed inside the outer layer body (1), a reflux buffer zone (101) is formed between the inner wall of the outer layer body (1) and the outer wall of the middle layer body (2), the middle layer body (2) is provided with a middle layer hole, the outer layer hole, the reflux buffer zone (101) and the middle layer hole communicate to form a tortuous outflow channel, a detection area (201) is formed inside the middle layer body (2), the outflow channel is connected to the detection area (201), and a detection element is disposed in the detection area (201); A shrapnel is disposed in the outflow channel, and the shrapnel is used to buffer or block the solution entering the detection area (201) from the outflow channel. The outflow channel includes an upper outflow channel, and the shrapnel includes a first shrapnel (14) disposed in the upper outflow channel. The connecting end of the first shrapnel (14) is connected to the inner wall of the outer layer body (1), the free end of the first shrapnel (14) extends toward the side of the middle layer body (2), the connecting end of the first shrapnel (14) is the lower end, the free end of the first shrapnel (14) is the upper end, and the reflux buffer zone (101) is formed between the first shrapnel (14) and the inner wall of the outer layer body (1).

2. The solution detection sensor according to claim 1, characterized in that, The middle layer body (2) includes an arc segment, and the arc segment corresponds to the outer layer hole.

3. The solution detection sensor according to claim 2, characterized in that, The outer layer holes include a first outer layer hole (11) and a second outer layer hole (12) respectively disposed on both sides of the top of the outer layer body (1). The arc segment includes an upper arc segment (21), the upper arc segment (21) is concave, and the concave surface of the upper arc segment (21) faces the first outer layer hole (11) and the second outer layer hole (12).

4. The solution detection sensor according to claim 3, characterized in that, The middle layer body (2) further includes a side segment (22) connected to the upper arc segment (21). The middle layer holes include a first middle layer hole (23) and a second middle layer hole (24). The first middle layer hole (23) is located at the junction of the side segment (22) and the upper arc segment (21), and the second middle layer hole (24) is located at the lower part of the side segment (22).

5. The solution detection sensor according to claim 4, wherein One end of the side segment (22) close to the first middle layer hole (23) is concave, and the concave surface of the side segment (22) faces the outer layer body (1).

6. The solution detection sensor according to claim 2, wherein, The solution detection sensor further includes an inner housing member (200), the inner housing member (200) is disposed inside the middle layer body (2), the detection area (201) is formed inside the inner housing member (200), and the inner housing member (200) is provided with an inner flow channel connecting the detection area (201) and the outflow channel.

7. The solution detection sensor according to claim 6, characterized in that, The outer layer holes further include a third outer layer hole (13) disposed at the bottom of the outer layer body (1). The arc segment further includes a lower arc segment (25), the lower arc segment (25) is convex, and the convex surface of the lower arc segment (25) faces the third outer layer hole (13).

8. The solution detection sensor according to claim 7, characterized in that, The inner flow channel includes a lower inner flow channel hole (203) located at the bottom of the inner housing member (200), and a filter member (3) is disposed between the lower inner flow channel hole (203) and the third outer layer hole (13).

9. The solution detection sensor according to claim 8, characterized in that, The filter member (3) is a filter screen or a brush.

10. The solution detection sensor according to claim 6, characterized in that, The outer housing member (100) includes a first outer housing (102) and a second outer housing (103). The first outer housing (102) and the second outer housing (103) cover the outside of the inner housing member (200). One of the first outer housing (102) and the second outer housing (103) is provided with a card slot, and the other of them is provided with an elastic buckle (16), and the elastic buckle (16) is snapped into the card slot.

11. The solution detection sensor according to claim 1, characterized in that, Threaded posts (4) are provided on the outer wall of the outer housing member (100) and are used for threaded connection with threaded fasteners to define the position of the solution detection sensor.

12. The solution detection sensor according to claim 1, characterized in that, A preset-length exhaust pipe (5) is further provided at the top of the outer layer body (1), and the exhaust pipe (5) is communicated with the outer layer hole.

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