A solution detection sensor

Abstract

The present invention belongs to the technical field of solution detection, and discloses a solution detection sensor, which includes a housing layer and a valve body assembly. A detection cavity is formed inside the housing layer, and a detection element is arranged in the detection cavity. An external flow channel communicating with the detection cavity is arranged on the housing layer. The external flow channel includes an upper external flow port located at the top of the housing layer and a lower external flow port located below the upper external flow port; the valve body assembly includes a valve cover and a floating member. The valve cover is connected to the housing layer and is arranged on the outer periphery of the upper external flow port. An activity cavity communicating with the outside is arranged inside the valve cover, and the floating member is movably arranged in the activity cavity, and the floating member can open or block the upper external flow port. The solution detection sensor of the present invention blocks the upper external flow port through the floating member, reduces the impact force of the solution flowing in from the upper external flow port, blocks the bubbles from entering the detection cavity from the upper external flow port, and ensures 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 to a solution detection sensor. Background Art

[0002] At present, the detection cavity of solution detection sensors on the market is directly exposed or protected by a filter screen, such as ultrasonic sensors, laser sensors, etc. When the detection cavity is exposed, the detection cavity is easily affected by the direct impact of the added solution or the shaking of the solution during vehicle operation. The bubbles and foreign objects generated by the solution oscillation caused by the added solution or the solution shaking will affect the signal processing of ultrasonic waves or lasers, making the measured value inaccurate; the top of the existing solution detection sensors is usually provided with exhaust holes to facilitate the discharge of the gas in the detection cavity, but in actual use, the liquid carrying bubbles can flow into the detection cavity from the exhaust holes, affecting the detection accuracy. Summary of the Invention

[0003] An object of the present invention is to provide a solution detection sensor, which blocks the upper outflow port through a floating member to reduce the impact force of the solution flowing in from the upper outflow port, and blocks the bubbles from entering the detection cavity from the upper outflow port, 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 layer, inside which a detection cavity is formed. A detection element is arranged in the detection cavity. An outflow channel communicating with the detection cavity is arranged on the housing layer. The outflow channel includes an upper outflow port located at the top of the housing layer and a lower outflow port located below the upper outflow port;

[0007] A valve body assembly, which includes a valve cover and a floating member. The valve cover is connected to the housing layer and is arranged on the periphery of the upper outflow port. An activity cavity communicating with the outside is arranged inside the valve cover. The floating member is movably arranged in the activity cavity, and the floating member can open or block the upper outflow port.

[0008] As an optional technical solution, a valve opening communicating with the activity cavity is opened at the top of the valve cover.

[0009] As an optional technical solution, a limiting rib is arranged on the inner wall of the valve cover, and the limiting rib is used to prevent the floating member from blocking the valve opening.

[0010] As an alternative technical solution, one of the valve cover and the outer shell layer is provided with a first snap, and the other of the two is provided with a first slot, and the first snap is snap-fitted into the first slot.

[0011] As an alternative technical solution, a first baffle is provided directly below the upper port of the outer flow.

[0012] As an alternative technical solution, a second baffle is provided at the circumferential edge of the first baffle, and the second baffle extends toward the top of the outer shell layer.

[0013] As an alternative technical solution, the solution detection sensor further includes a middle body, the middle body is located inside the outer shell layer, the detection cavity is formed inside the middle body, the middle body is provided with an upper middle hole and a lower middle hole, and an upper return buffer area and a lower return buffer area are formed between the inner wall of the outer shell layer and the outer wall of the middle body. The upper port of the outer flow, the upper return buffer area, and the upper middle hole are tortuously connected to form an upper outer flow channel, and the lower port of the outer flow, the lower return buffer area, and the lower middle hole are tortuously connected to form a lower outer flow channel.

[0014] As an alternative technical solution, the solution detector further includes an inner shell member disposed inside the middle body, the detection cavity is formed inside the inner shell member, the inner shell member is provided with an inner flow channel communicating with the detection cavity, and the inner flow channel is connected to the outer flow channel.

[0015] As an alternative technical solution, the first baffle is the top wall of the middle body, the middle body further includes side segments respectively connecting the two sides of the first baffle in the Y-axis direction, the upper middle hole includes a first middle hole and a second middle hole, the first middle hole is located at the junction of the first baffle and the side segment, and the second middle hole is located at the lower part of the side segment.

[0016] As an alternative technical solution, a shrapnel is disposed in the outer flow channel, and the shrapnel is used to buffer or block the solution entering the detection cavity from the outer flow channel.

[0017] As an alternative technical solution, the shrapnel includes a first shrapnel disposed in the upper return buffer area, the connecting end of the first shrapnel is connected to the inner wall of the outer shell layer, the free end of the first shrapnel extends toward one side of the side segment, and a liquid inlet is formed at an interval between the free end of the first shrapnel and the outer wall of the side segment.

[0018] As an alternative technical solution, the lower part of the side segment is a second elastic sheet, and the free end of the second elastic sheet extends obliquely towards the side of the outer shell layer; and the free end of the second elastic sheet abuts against the inner wall of the outer shell layer or the first elastic sheet, or a second middle layer hole is formed between the free end of the second elastic sheet and the inner wall of the outer shell layer or the first elastic sheet.

[0019] As an alternative technical solution, a lower arc segment is further provided at the bottom of the middle body, the lower arc segment protrudes outwards, and the convex surface of the lower arc segment faces the outer flow lower port.

[0020] As an alternative technical solution, the elastic sheet further includes a third elastic sheet disposed in the lower backflow buffer area. The connecting end of the third elastic sheet is connected to the inner wall of the outer shell layer, and the free end of the third elastic sheet extends obliquely towards the side of the lower arc segment. The third elastic sheet is used to block the communication between the outer flow lower port and the lower middle layer hole.

[0021] As an alternative technical solution, a filter element is provided at the outer flow lower port.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention provides a solution detection sensor for detecting the characteristics of a solution, such as concentration. The solution detection sensor is placed in a solution chamber. When the solution in the solution chamber is at a low liquid level, the solution chamber is filled with the solution. The solution in the detection chamber mainly flows in from the outer flow lower port. When the solution splashes onto the valve body assembly and penetrates into the movable cavity of the valve cover, the floating member can block the solution in the movable cavity. Therefore, the solution carrying bubbles cannot directly pass through the outer flow upper port and enter the detection chamber, and the solution detection sensor can obtain a more accurate detection value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the drawings and embodiments;

[0025] Figure 1 The front view of the solution detection sensor described in the specific embodiment;

[0026] Figure 2 A front cross-sectional view of the solution detection sensor described in the specific embodiment;

[0027] Figure 3 Another front cross-sectional view of the solution detection sensor described in the specific embodiment;

[0028] Figure 4 A left cross-sectional view of the solution detection sensor (when the filter element is a brush) described in the specific embodiment;

[0029] Figure 5 Another left sectional view of the solution detection sensor described in the specific embodiment;

[0030] Figure 6 is Figure 5 The enlarged partial view of position A in

[0031] Figure 7 is Figure 5 The enlarged partial view of position B in

[0032] Figure 8 Another left sectional view of the solution detection sensor (when the filter element is a filter screen) described in the specific embodiment.

[0033] In the figure:

[0034] 100, detection cavity; 200, upper reflux buffer zone; 300, lower reflux buffer zone; 400, first housing; 500, second housing; 600, liquid inlet.

[0035] 1, inner housing part; 101, upper inner flow channel hole; 102, lower inner flow channel hole.

[0036] 2, outer shell layer; 21, upper outer flow port; 22, lower outer flow port; 23, first buckle; 24, first elastic sheet; 25, third elastic sheet; 26, second buckle; 27, partition.

[0037] 3, valve body assembly; 31, valve cover; 311, valve port; 312, limit rib; 32, floating part.

[0038] 4, middle layer body; 41, first baffle; 42, second baffle; 43, side segment; 44, first middle layer hole; 45, second middle layer hole; 46, third middle layer hole; 47, lower arc segment; 48, fourth middle layer hole.

[0039] 5, filter element;

[0040] 6, threaded post. Detailed implementation manners

[0041] 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 making creative efforts belong to the scope of protection of the present invention.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside 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 circumstances.

[0043] 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", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description herein, it should be understood that the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus 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 have no special meaning.

[0045] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0046] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments.

[0047] In Figure 2 the solution detection sensor shown, the floating member 32 blocks the upper port 21 of the outer flow, and the filter member 5 is not shown; in Figure 3 the solution detection sensor shown, the floating member 32 floats on the top of the movable cavity of the valve cover 31, and the filter member 5 is selected as a brush; in Figure 4 the solution detection sensor shown, the floating member 32 blocks the upper port 21 of the outer flow, and the filter member 5 is selected as a brush; in Figure 5In the solution detection sensor shown, fourth middle holes 48 are provided at both ends of the lower arc section 47 in the Y-axis direction; Figure 6 is Figure 5 a partial enlarged view of position A in Figure 7 is Figure 5 a partial enlarged view of position B in; When Figure 8 in the solution detection sensor shown, the filter element 5 is a filter screen.

[0048] This embodiment provides a solution detection sensor, which 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., and can also be used in combination with other components, which is not limited here.

[0049] Taking the urea solution as an example in this embodiment, the SCR system includes a urea tank for containing the urea solution. The solution detection sensor is installed in the urea tank. When injecting the urea solution into the filling port of the urea tank, a large number of bubbles contained in the injected solution will interfere with the detection of the solution detection sensor; at the same time, the bubbles generated by the shaking of the urea solution may also interfere with the detection of the solution detection sensor.

[0050] As Figures 1 to 8 shown, to solve the above problems, this embodiment provides a solution detection sensor. The solution detection sensor includes a housing layer 2 and a valve body assembly 3. A detection cavity 100 is formed inside the housing layer 2. A detection element is arranged in the detection cavity 100. An external flow channel communicating with the detection cavity 100 is provided on the housing layer 2. The external flow channel includes an external flow upper port 21 located at the top of the housing layer 2 and an external flow lower port 22 located below the external flow upper port 21; the valve body assembly 3 includes a valve cover 31 and a floating member 32. The valve cover 31 is connected to the housing layer 2 and the valve cover 31 is arranged on the outer periphery of the external flow upper port 21. An activity cavity communicating with the outside is provided inside the valve cover 31. The floating member 32 is movably arranged in the activity cavity, and the floating member 32 can open or block the external flow upper port 21.

[0051] Specifically, when the solution detection sensor is placed in the urea tank, when initially filling the urea tank with the urea solution or when the liquid level of the urea solution is lower than the solution detection sensor and filling the urea solution normally, the urea solution mainly enters the detection cavity 100 from the external flow lower port 22. If the splashed solution during the filling process falls on the valve body assembly 3, the solution penetrates into the activity cavity. Since the floating member 32 is arranged in the activity cavity and the floating member 32 can block the urea solution in the activity cavity, the solution carrying bubbles cannot directly pass through the external flow upper port 21 and enter the detection cavity 100, and the solution detection sensor can obtain a more accurate detection value.

[0052] After the accumulation amount of the urea solution seeps into the movable cavity of the valve cover 31 reaches the preset amount, the floating member 32 slightly floats upward in the movable cavity, and a fine gap is formed between the floating member 32 and the upper outflow port 21. The urea solution in the movable cavity can penetrate through the upper outflow port 21 and enter the detection cavity 100, while the bubbles carried by this part of the urea solution cannot pass through the upper outflow port 21 due to the extrusion of the gravity of the floating member 32. Therefore, the bubbles cannot enter the detection cavity 100 from the upper outflow port 21, thus ensuring the detection accuracy of the solution detection sensor.

[0053] Specifically, continuously inject urea solution into the urea tank. Then, as the urea solution in the detection cavity 100 increases and the gas accumulated at the upper outflow port 21 increases, the air pressure at the upper outflow port 21 increases, causing a gap to form between the floating member 32 and the upper outflow port 21. The gas passes through the gap into the movable cavity and is discharged to the outside. When the gas passes through the gap into the movable cavity, the discharged gas can block the urea solution with bubbles in the movable cavity from penetrating the upper outflow port 21, thus ensuring the detection accuracy of the solution detection sensor.

[0054] When the urea solution in the urea tank reaches the high liquid level, the urea solution completely submerges the solution detection sensor. The floating member 32 floats and abuts against the top inner wall of the valve cover 31, and the movable cavity is completely communicated with the upper outflow port 21. The urea solution can flow in or out from the upper outflow port 21 and the lower outflow port 22, enabling the urea solution in the detection cavity 100 to be quickly updated, ensuring that the solution detection sensor can detect the latest value in real time. And when the solution detection sensor is submerged by the urea solution and the urea solution continues to be filled or the urea solution outside shakes, there may be disturbed solution entering from the upper outflow port 21, while the floating member 32 can play a buffering role. Therefore, the impact force of the urea solution flowing into the detection cavity 100 from the upper outflow port 21 is weakened, thus ensuring the stability of the urea solution in the detection cavity 100 and reducing the impact on the detection cavity 100.

[0055] Optionally, the floating member 32 is a floating ball, and the density of the floating ball is less than the density of the solution to be measured.

[0056] As Figure 4 and Figure 5 shown, in this embodiment, the lower outflow port 22 is located at the bottom of the outer shell layer 2. In some other embodiments, the lower outflow port 22 is located on the side wall of the outer shell layer 2, or both the bottom and the side wall of the outer shell layer 2 are provided with the lower outflow port 22.

[0057] In this embodiment, the solution detector further includes an inner shell member 1 disposed inside the middle layer member 4. A detection cavity 100 is formed inside the inner shell member 1. An inner flow channel communicating with the detection cavity 100 is formed on the inner shell member 1, and the inner flow channel is connected to the outer flow channel. In some other embodiments, the cavity inside the outer shell layer 2 directly forms the detection cavity 100, and the detection element performs detection within the detection cavity 100.

[0058] Optionally, the inner flow channel of the inner shell member 1 includes an upper inner flow channel hole 101 and a lower inner flow channel hole 102. The upper inner flow channel hole 101 is located at the top of the inner shell member 1, and the lower inner flow channel hole 102 is located at the bottom of the inner shell member 1. Both the upper inner flow channel hole 101 and the lower inner flow channel hole 102 communicate with the detection cavity 100.

[0059] In this embodiment, the outer flow channel includes an upper outer flow channel and a lower outer flow channel. The upper outer flow channel is connected to the upper inner flow channel hole 101, and the lower outer flow channel is connected to the lower inner flow channel hole 102.

[0060] Optionally, a filter member 5 is disposed between the lower inner flow channel hole 102 and the lower outer port 22. Since sediments are usually concentrated at the bottom of the solution, and the solution mainly enters the lower inner flow channel hole 102 from the lower outer port 22 and reaches the detection cavity 100 through the lower inner flow channel hole 102, the solution passing through the lower outer port 22 carries more sediments than the solution passing through the upper outer port 21. Therefore, setting the filter member 5 between the lower inner flow channel hole 102 and the lower outer port 22 can effectively filter sediments and reduce the number of bubbles entering the detection cavity 100. Optionally, the filter member 5 is a filter screen or a brush. The brush is densely composed of a large number of soft filaments. The soft filaments can sway with the solution in the solution. The soft filaments are interlaced with each other. The solution needs to pass through the brush to enter the detection cavity 100. Therefore, both sediments and bubbles are blocked, and the flexible filaments can puncture the bubbles or the bubbles adhere to the flexible filaments.

[0061] Optionally, a valve port 311 communicating with the movable cavity is formed at the top of the valve cover 31. A limiting rib 312 is provided on the inner wall of the valve cover 31. The limiting rib 312 is used to block the floating member 32 to prevent the floating member 32 from completely blocking the valve port 311. In this embodiment, the limiting rib 312 is provided on the inner wall of the valve cover 31. When the urea solution in the urea tank reaches the high liquid level, the floating member 32 floats up and will abut against the limiting rib 312, leaving a gap with the valve port 311, and gas can be discharged from the gap between the floating member 32 and the valve port 311. Specifically, the limiting rib 312 is provided on the inner wall of the top or the side of the valve cover 31. The specific structure of the limiting rib 312 is not limited as long as the limiting rib 312 can space the floating member 32 from the valve port 311.

[0062] Optionally, one of the valve cover 31 and the outer shell layer 2 is provided with a first snap 23, and the other of them is provided with a first slot, and the first snap 23 is snapped into the first slot. In this embodiment, the first snap 23 is provided on the outer shell layer 2, and the first slot is provided on the valve cover 31. When it is necessary to clean, maintain or replace the floating member 32, the first snap 23 is disengaged from the first slot, and then the valve cover 31 can be removed from the outer shell layer 2, so as to realize the cleaning, maintenance or replacement of the floating member 32. In some other embodiments, the first snap 23 is provided on the valve cover 31, and the first slot is provided on the outer shell layer 2.

[0063] In this embodiment, a first baffle 41 is provided between the outer shell layer 2 and the inner shell member 1 directly below the upper outflow port 21. When the solution flows in from the upper outflow port 21, the first baffle 41 can first buffer and divide the solution, reducing the impact force of the solution and the bubbles generated thereby.

[0064] Optionally, a second baffle 42 is provided at the circumferential edge of the first baffle 41, and the second baffle 42 extends towards the top of the outer shell layer 2.

[0065] In this embodiment, second baffles 42 are respectively provided at both ends of the first baffle 41 in the X-axis direction, and the first baffle 41 is concavely arranged in the Z-axis direction. The concave surface of the first baffle 41 faces the top of the outer shell layer 2. After the solution impacts the concave surface of the first baffle 41, it diffuses and buffers around. For example, when diffusing in the X-axis direction, it is blocked by the second baffle 42, and when diffusing in the Y-axis direction, it is guided by the concave surface of the first baffle 41 and impacts the inner wall of the outer shell layer 2. In some other embodiments, the first baffle 41 is a flat plate structure, and second baffles 42 are provided around the first baffle 41.

[0066] Specifically, because the first baffle 41 is concavely arranged or the second baffle 42 is provided at the circumferential edge of the first baffle 41, when the liquid level of the solution in the urea tank is below the level of the first baffle 41, the solution that splashes into and passes through the upper outflow port 21 from the valve body assembly 3 will first accumulate and stand on the first baffle 41, avoiding the solution directly falling into the detection cavity 100. When the first baffle 41 is filled with the solution, the solution will overflow from the edge of the first baffle 41 to the upper reflux buffer area 200. The overflowed solution has accumulated and stood on the first baffle 41, so the impact force of the solution overflowing into the upper reflux buffer area 200 described below is weakened and the bubbles carried will float to the liquid surface and escape back to the upper outflow port 21; when the liquid level of the solution in the urea tank rises to a position sufficient to make the floating member 32 leave the upper outflow port 21, the solution flowing in from the upper outflow port 21 still impacts the first baffle 41 and then diffuses towards the periphery of the second baffle 42, and the second baffle 42 can guide the reverse flow of the solution, that is, guide the solution to flow towards the inner wall of the top of the outer shell layer 2, thereby buffering the solution.

[0067] In this embodiment, the solution detection sensor further includes a middle layer body 4. The middle layer body 4 is located inside the outer shell layer 2 and is fitted around the outer periphery of the inner shell member 1. The middle layer body 4 is provided with an upper middle hole and a lower middle hole. An upper reflux buffer area 200 and a lower reflux buffer area 300 are formed between the inner wall of the outer shell layer 2 and the outer wall of the middle layer body 4. The upper outflow port 21, the upper reflux buffer area 200, and the upper middle hole are tortuously connected to form an upper outflow channel. The lower outflow port 22, the lower reflux buffer area 300, and the lower middle hole are tortuously connected to form a lower outflow channel.

[0068] Specifically, place the solution detection sensor of this embodiment in the urea tank. The solution in the urea tank can be sequentially connected through the upper outflow port 21, the upper reflux buffer area 200, the upper middle hole, and the inner flow channel, so as to reach the detection cavity 100. The detection element detects the solution in the detection cavity 100. Since the solution is buffered and static in the upper reflux buffer area 200, the flow rate of the solution finally reaching the detection cavity 100 becomes slower, so that the bubbles carried by the solution have enough time to be static in the upper reflux buffer area 200. During the static process, the larger bubbles directly float upward by their own buoyancy and are discharged from the upper outflow port 21 without following the solution through the upper middle hole into the detection cavity 100. The fine bubbles gather with each other to form large bubbles during the static process, and then also float upward by their own buoyancy and are discharged to the outside from the upper outflow port 21. The fine bubbles entering the detection cavity 100 are greatly reduced, reducing the influence of the fine bubbles on the detection. Moreover, the impact force of the solution is weakened, slowing down the impact of the solution on the detection cavity 100, and the bubbles generated by the impact also correspondingly decrease. At the same time, the stability of the solution in the detection cavity 100 is ensured, and the reliability of the detection result is guaranteed. The solution can also be sequentially connected through the lower outflow port 22, the lower reflux buffer area 300, the lower middle hole, and the inner flow channel, so as to reach the detection cavity 100. Since the solution is buffered and static in the lower reflux buffer area 300, the flow rate of the solution finally reaching the detection cavity 100 becomes slower, slowing down the impact of the solution on the detection cavity 100, and the bubbles generated by the impact also correspondingly decrease, ensuring the reliability of the detection result.

[0069] In some other embodiments, the cavity inside the middle layer body 4 directly forms the detection cavity 100, and the detection element performs detection within the detection cavity 100.

[0070] Optionally, a partition plate 27 is provided at an interval between the upper reflux buffer area 200 and the lower reflux buffer area 300. The partition plate 27 can separate the upper reflux buffer area 200 from the lower reflux buffer area 300, preventing the solution overflowing from the first baffle 41 into the upper reflux buffer area 200 from directly impacting into the lower reflux buffer area 300 and avoiding a large number of bubbles being generated in the lower reflux buffer area 300 due to the impact.

[0071] In this embodiment, the outer shell layer 2 and the middle body 4 are integrally formed, reducing the production cost. In some other embodiments, the middle body 4 and the inner shell member 1 are integrally formed.

[0072] The detection element can be selected as an ultrasonic detection element or a laser detection element. Both the ultrasonic detection element and the laser detection element are prior arts, and will not be elaborated one by one in this embodiment.

[0073] In this embodiment, the first baffle 41 is the top wall of the middle body 4. The middle body 4 further includes side segments 43 respectively connected to both sides of the first baffle 41 in the Y-axis direction. The upper middle holes include a first middle hole 44 and a second middle hole 45. The first middle hole 44 is located at the junction of the first baffle 41 and the side segment 43, and the second middle hole 45 is located at the lower part of the side segment 43.

[0074] Specifically, upper reflux buffer zones 200 are respectively formed between the two side segments 43 and the outer shell layer 2. Taking one of the side segments 43 as an example in this embodiment, the height of the second middle hole 45 in the Z-axis is higher than that of the upper reflux buffer zone 200. After the solution is buffered and statically settled in the upper reflux buffer zone 200, it then flows into the interior of the middle body 4 from the second middle hole 45. The solution passing through the second middle hole 45 is collectively squeezed, prompting the fine bubbles carried by this part of the solution to aggregate into larger bubbles. The larger bubbles float upward by their own buoyancy and pass through the first middle hole 44 and return to the outer flow upper port 21 before reaching the detection cavity 100. A small part of the solution passing through the second middle hole 45 passes through the upper inner flow channel hole 101 and enters the detection cavity 100, and another part of the solution passing through the second middle hole 45 carrying bubbles floats upward and passes through the first middle hole 44 and returns to the outer flow upper port 21.

[0075] In some other embodiments, the side segment 43 is a flat plate structure. In this embodiment, one end of the side segment 43 close to the first middle hole 44 is recessed. The concave surface of the side segment 43 faces the outer shell layer 2. The tops of the two side segments 43 are close to each other, and the opening is narrowed, improving the speed of the solution passing through the first middle hole 44 and the exhaust speed. The upper side wall and the lower side wall of the second middle hole 45 are arranged in a vertical dislocation, and the lower side wall extends toward the side close to the detection cavity 100, and the upper side wall extends toward the side away from the detection cavity 100, so that the second middle hole 45 forms a diversion hole with an upward opening, ensuring that most of the solution and bubbles passing through the second middle hole 45 are upwardly guided to the first middle hole 44. And because both the side segment 43 and the first baffle 41 are recessed, and the first middle hole 44 is located at the junction of the side segment 43 and the first baffle 41, therefore, the solution flowing in from the outer flow upper port 21 cannot directly flow into the interior of the middle body 4 from the first middle hole 44, otherwise the solution will directly pass through the upper inner flow channel hole 101 and impact into the detection cavity 100, affecting the detection accuracy.

[0076] The upper and middle layer holes further include a third middle layer hole 46, which is located on one side of the end of the first baffle 41 in the X-axis direction, and the third middle layer hole 46 is located above the reflection / receiving surface at the end of the inner housing member 1.

[0077] Optionally, a shrapnel is arranged in the outflow channel, and the shrapnel is used to buffer or block the solution entering the detection cavity 100 from the outflow channel.

[0078] Optionally, the shrapnel includes a first shrapnel 24 arranged in the upper reflux buffer area 200. The connecting end of the first shrapnel 24 is connected to the inner wall of the outer shell layer 2. The free end of the first shrapnel 24 extends towards one side of the side section 43, and a liquid inlet 600 is formed at an interval between the free end of the first shrapnel 24 and the outer wall of the side section 43. The connecting end of the first shrapnel 24 is the lower end, and the free end of the first shrapnel 24 is the upper end. An upper reflux buffer area 200 is formed between the first shrapnel 24 and the inner wall of the outer shell layer 2. The elastic coefficient of the first shrapnel 24 is a first preset elastic value. When the first shrapnel 24 is in the normal state, the liquid inlet 600 is open. When the first shrapnel 24 is in the blocking state, the free end of the first shrapnel 24 is deformed and abuts against the side section 43, blocking the upper reflux buffer area 200 from the detection cavity 100, that is, the liquid inlet 600 is blocked. The solution flowing in from the upper outflow port 21 first passes through the buffering of the first baffle 41 and the second baffle 42 and then flows to the upper reflux buffer area 200. When the impact force of the solution impacting the upper reflux buffer area 200 or the impact force of the solution in the upper reflux buffer area 200 due to vibration is greater than the first preset impact value, the first shrapnel 24 elastically deforms and switches from the normal state to the blocking state, thereby preventing the solution with a greater impact force from passing through the liquid inlet 600 and entering the detection cavity 100. And because the free end of the first shrapnel 24 is inclined upwards, even if the solution with an impact force less than the first preset impact value flows back from the upper reflux buffer area 200 along the free end of the first shrapnel 24 and seeps into the liquid inlet 600, the impact force of this part of the refluxing solution is also weakened. To sum up, the first shrapnel 24 can buffer or block the solution entering the detection cavity 100 from the upper reflux buffer area 200.

[0079] Optionally, the free end of the first shrapnel 24 is located below the first middle layer hole 44, that is, the liquid inlet 600 is located below the first middle layer hole 44, so as to prevent the first shrapnel 24 from guiding the solution to pass through the first middle layer hole 44 and enter the inside of the middle body 4, affecting the detection accuracy of the detection element.

[0080] Optionally, the lower part of the side segment 43 is a second elastic piece, and the free end of the second elastic piece extends obliquely towards the side of the outer shell layer 2; the free end of the second elastic piece abuts against the inner wall of the outer shell layer 2 or the first elastic piece 24, or a second middle-layer hole 45 is formed between the free end of the second elastic piece and the inner wall of the outer shell layer 2 or the second elastic piece 24. The elastic coefficient of the second elastic piece is a second preset elastic value, and the elastic coefficient of the first elastic piece 24 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 45 is formed between the free end of the second elastic piece and the inner wall of the outer shell layer 2 or the first elastic piece 24, and the diameter of the second middle-layer hole 45 is smaller than the diameter of the liquid inlet 600, so that when the solution flows from the liquid inlet 600 to the second middle-layer hole 45, the fine bubbles remaining in the solution are convenient to aggregate into large bubbles and float upward. At the same time, the second elastic piece can further buffer the solution, so that the solution slowly enters the detection cavity 100. In another embodiment, the second elastic piece can also block the above-mentioned second middle-layer hole 45 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 shell layer 2 or the first elastic piece 24, and when the solution enters from the liquid inlet 600, a gap is formed between the free end of the second elastic piece and the inner wall of the outer shell layer 2 or the first elastic piece 24, that is, the second middle-layer hole 45 is formed, so that the solution slowly enters the detection cavity 100; during the process that the solution enters from the liquid inlet 600 and is discharged from the second middle-layer hole 45, the fine bubbles remaining in the solution are also convenient to aggregate into large bubbles and float upward. At the same time, the second elastic piece can also further buffer the solution.

[0081] Optionally, the thickness of the first elastic piece 24 is greater than that of the second elastic piece, so the elastic coefficient of the first elastic piece 24 is greater than that of the second elastic piece.

[0082] Optionally, a lower arc segment 47 is further provided at the bottom of the middle body 4. The lower arc segment 47 protrudes outward, and the convex surface of the lower arc segment 47 faces the outer lower flow port 22. The lower middle-layer hole includes a fourth middle-layer hole 48. The fourth middle-layer holes 48 are provided at both ends of the lower arc segment 47 in the Y-axis direction. After the solution flows in from the outer lower flow port 22, it impacts on the convex surface of the lower arc segment 47, and the convex surface of the lower arc segment 47 guides the solution to pass through the fourth middle-layer holes 48 at both ends of the lower arc segment 47 respectively, so as to enter the lower inner flow channel hole 102 and the detection cavity 100. Since the lower arc segment 47 buffers and diverts the solution, the impact force of the solution entering the lower inner flow channel hole 102 and the detection cavity 100 is weakened. In some other embodiments, the fourth middle-layer hole 48 is located in the middle of the convex surface of the lower arc segment 47.

[0083] Optionally, the elastic piece further includes a third elastic piece 25 disposed in the lower reflux buffer area 300. The connecting end of the third elastic piece 25 is connected to the inner wall of the outer shell layer 2. The free end of the third elastic piece 25 extends obliquely downward to one side of the lower arc segment 47. The third elastic piece 25 is used to block the communication between the outer lower flow port 22 and the lower middle layer hole. When the solution flows into the lower reflux buffer area 300 from the outer lower flow port 22, the free end of the third elastic piece 25 is impacted by the solution and elastically deformed to abut against the lower arc segment 47, blocking the lower reflux buffer area 300 from communicating with the fourth middle layer hole 48. Therefore, the solution with an impact force exceeding the maximum preset value cannot flow from the lower reflux buffer area 300 into the detection cavity 100, avoiding the impact on the operation of the detection element in the detection cavity 100 caused by the solution with a large impact force; in another embodiment, in the normal state of the third elastic piece 25, the free end of the third elastic piece 25 abuts against the lower arc segment 47 to block the fourth middle layer hole 48, and the outer lower flow port 22 and the lower inner flow channel hole 102 cannot be conducted, so that the solution is not allowed to enter the detection cavity 100 from the fourth middle layer hole 48, but the solution in the detection cavity 100 is allowed to seep out from the outside of the fourth middle layer hole 48. Thus, the vibration and impact of the external solution cannot disturb the solution in the detection cavity 100 through the fourth middle layer hole 48, while the vibration and impact of the solution in the detection cavity 100 can cause the free end of the third elastic piece 25 to open, that is, the free end of the third elastic piece 25 is deformed to have a gap with the lower arc segment 47 to discharge the disturbed solution, so that the solution in the detection cavity 100 quickly becomes stable.

[0084] Optionally, the lower reflux buffer area 300 is communicated with two outer lower flow ports 22. One outer lower flow port 22 is located at the bottom of the outer shell layer 2, and the other outer lower flow port 22 is located on the side wall of the outer shell layer 2. If the solution flowing in from the outer lower flow port 22 at the bottom cannot pass through the fourth middle layer hole 48, this part of the solution can flow out from the outer lower flow port 22 on the side wall. According to the principle of conservation of momentum, the impact on the overall solution detection sensor by the solution 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 will preferentially discharge from the outer lower flow port 22 on the side wall of the outer shell layer 2, reducing the amount reaching the detection cavity 100.

[0085] When initially filling the urea tank with urea solution or when the liquid level of the urea solution is lower than the detection sensor and filling the urea solution normally, the urea solution mainly enters through the outer lower flow port 22 and sequentially passes through the lower reflux buffer area 300, the fourth middle layer hole 48, the lower inner flow channel hole 102 and the detection cavity 100. And if the splashed solution during the filling process falls on the valve port 311, the solution will enter the detection cavity 100 from the outer upper flow port 21. Only when the solution in the upper reflux buffer area 200 overflows the second middle layer hole 45, the solution will enter the detection cavity 100.

[0086] Optionally, the outer part of the inner housing member 1 is detachably covered with a first housing 400 and a second housing 500. One of the first housing 400 and the second housing 500 is provided with a second card slot, and the other is provided with a second buckle 26, and the second buckle 26 is snapped into the second card slot.

[0087] In this embodiment, a part of the outer shell layer 2 and a part of the middle layer body 4 constitute the first housing 400. The part of the outer shell layer 2 included in the first housing 400 is the upper part of the outer shell layer 2; another part of the outer shell layer 2 and another part of the middle layer body 4 constitute the second housing 500. The part of the outer shell layer 2 included in the second housing 500 is the lower part of the outer shell layer 2. The first housing 400 and the second housing 500 are detachably connected by snap connection, which is convenient for product disassembly and assembly, and can replace or repair the inner housing member 1. In some other embodiments, the entire outer shell layer 2 and a part of the middle layer body 4 constitute the first housing 400, and another part of the middle layer body 4 constitutes the second housing 500, or a part of the outer shell layer 2 constitutes the first housing 400, and another part of the outer shell layer 2 and the entire middle layer body 4 constitute the second housing 500.

[0088] Optionally, threaded posts 6 are provided on the outer wall of the outer shell layer 2. The threaded posts 6 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, bolts are used for threaded connection with the threaded posts 6, so as to ensure the installation stability of the solution detection sensor at the bottom of the urea tank. In some other embodiments, a plurality of threaded posts 6 may be provided on the outer wall of the outer shell layer 2.

[0089] In addition, the above are only the preferred embodiments 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, it includes: A housing layer (2) with a detection cavity (100) formed inside. A detection element is arranged in the detection cavity (100). An outflow channel communicating with the detection cavity (100) is arranged on the housing layer (2). The outflow channel includes an upper outflow port (21) located at the top of the housing layer (2) and a lower outflow port (22) located below the upper outflow port (21); A valve body assembly (3) including a valve cover (31) and a floating member (32). The valve cover (31) is connected to the housing layer (2) and is arranged on the outer periphery of the upper outflow port (21). An activity cavity communicating with the outside is arranged inside the valve cover (31). The floating member (32) is movably arranged in the activity cavity, and the floating member (32) can open or block the upper outflow port (21); A valve port (311) communicating with the activity cavity is opened at the top of the valve cover (31); A limiting rib (312) is arranged on the inner wall of the valve cover (31), and the limiting rib (312) is used to prevent the floating member (32) from blocking the valve port (311).

2. The solution detection sensor according to claim 1, characterized in that, One of the valve cover (31) and the housing layer (2) is provided with a first buckle (23), and the other of them is provided with a first card slot, and the first buckle (23) is clamped in the first card slot.

3. The solution detection sensor according to claim 1, characterized in that, A first baffle (41) is arranged directly below the upper outflow port (21).

4. The solution detection sensor according to claim 3, characterized in that, A second baffle (42) is arranged at the circumferential edge of the first baffle (41), and the second baffle (42) extends towards the top of the housing layer (2).

5. The solution detection sensor according to claim 3, characterized in that, The solution detection sensor further includes a middle layer body (4). The middle layer body (4) is located inside the housing layer (2). The detection cavity (100) is formed inside the middle layer body (4). The middle layer body (4) is provided with an upper middle hole and a lower middle hole. An upper return buffer area (200) and a lower return buffer area (300) are formed between the inner wall of the housing layer (2) and the outer wall of the middle layer body (4). The upper outflow port (21), the upper return buffer area (200), and the upper middle hole are tortuously communicated to form an upper outflow channel, and the lower outflow port (22), the lower return buffer area (300), and the lower middle hole are tortuously communicated to form a lower outflow channel.

6. The solution detection sensor according to claim 5, characterized in that, The solution detector further includes an inner housing part (1) arranged inside the middle layer body (4). The detection cavity (100) is formed inside the inner housing part (1). An inner flow channel communicating with the detection cavity (100) is arranged on the inner housing part (1), and the inner flow channel is connected to the outflow channel.

7. The solution detection sensor according to claim 5, wherein, the first baffle (41) is the top wall of the middle layer body (4), the middle layer body (4) further includes side segments (43) respectively connected to both sides of the first baffle (41) in the Y-axis direction, the upper middle layer holes include a first middle layer hole (44) and a second middle layer hole (45), the first middle layer hole (44) is located at the junction of the first baffle (41) and the side segment (43), and the second middle layer hole (45) is located at the lower part of the side segment (43).

8. The solution detection sensor according to claim 7, wherein, elastic pieces are arranged in both the upper external flow channel and the lower external flow channel, and the elastic pieces are used to buffer or block the solution entering the detection cavity (100) from the upper external flow channel and the lower external flow channel.

9. The solution detection sensor according to claim 8, wherein, the elastic piece includes a first elastic piece (24) arranged in the upper reflux buffer area (200), the connecting end of the first elastic piece (24) is connected to the inner wall of the outer shell layer (2), the free end of the first elastic piece (24) extends towards one side of the side segment (43), and a liquid inlet (600) is formed at an interval between the free end of the first elastic piece (24) and the outer wall of the side segment (43).

10. The solution detection sensor according to claim 9, wherein, the lower part of the side segment (43) is a second elastic piece, and the free end of the second elastic piece extends obliquely towards one side of the outer shell layer (2); the free end of the second elastic piece abuts against the inner wall of the outer shell layer (2) or the first elastic piece (24), or a second middle layer hole (45) is formed between the free end of the second elastic piece and the inner wall of the outer shell layer (2) or the first elastic piece (24).

11. The solution detection sensor according to claim 8, wherein, a lower arc segment (47) is further arranged at the bottom of the middle layer body (4), the lower arc segment (47) protrudes outwards, and the outwardly convex surface of the lower arc segment (47) faces the lower external flow port (22).

12. The solution detection sensor according to claim 11, wherein, the elastic piece further includes a third elastic piece (25) arranged in the lower reflux buffer area (300), the connecting end of the third elastic piece (25) is connected to the inner wall of the outer shell layer (2), the free end of the third elastic piece (25) extends obliquely towards one side of the lower arc segment (47), and the third elastic piece (25) is used to block the communication between the lower external flow port (22) and the lower middle layer hole.

13. The solution detection sensor according to claim 1, wherein, a filter element (5) is arranged at the lower external flow port (22).

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