CN221347059U

CN221347059U - Urea sensor

Info

Publication number: CN221347059U
Application number: CN202323370016.5U
Authority: CN
Inventors: 覃东; 周锦威; 黄志耀; 周晓思
Original assignee: Zhaoqing Aodiwei Sensing Technology Co ltd
Current assignee: Zhaoqing Aodiwei Sensing Technology Co ltd
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-07-16
Anticipated expiration: 2033-12-11

Abstract

The utility model relates to the technical field of urea sensors for vehicles, in particular to a urea sensor which comprises a sealing shell, a first detection probe, a reflecting sheet, a second detection probe and a connecting rod, wherein the sealing shell is provided with a sealing cavity, a circuit board is arranged in the sealing cavity, the top of the sealing shell is provided with a first groove with an upward opening, the groove wall of a first side of the first groove is provided with the first detection probe, the groove wall of a second side of the first groove is provided with the reflecting sheet, and the reflecting sheet and the first detection probe are oppositely arranged at intervals; a second detection probe is arranged at the bottom wall of the first groove and is upwards arranged; the first detection probe and the second detection probe are electrically connected with the circuit board, so that the detection of the liquid level and the concentration of urea is realized; the upper end of connecting rod is fixed with the inboard of case lid, and the seal shell is connected to the lower extreme of connecting rod, does not need to offer the mounting hole that is used for installing urea sensor at the diapire of urea case, is convenient for the processing of urea case, has guaranteed moreover that the seal of urea case is good.

Description

Urea sensor

Technical Field

The utility model relates to the technical field of urea sensors for vehicles, in particular to a urea sensor.

Background

The exhaust treatment of diesel vehicles needs to consume urea, and a sensor is needed to be arranged in an automobile urea box to monitor the liquid level of urea solution in the urea box and the concentration of the urea solution so as to ensure sufficient urea supply and avoid insufficient exhaust treatment caused by insufficient urea supply.

The Chinese patent with the publication number of CN211697653U discloses a urea liquid level quality sensor, which is characterized in that a groove with an upward opening is arranged on a mounting seat, a first ultrasonic transduction piece and a reflecting plate which is arranged opposite to the first ultrasonic transduction piece are respectively arranged on the groove walls at two opposite sides of the groove, the first ultrasonic wave emitted by the first ultrasonic transduction piece is used for measuring urea concentration, and the first ultrasonic wave is received by the first ultrasonic transduction piece after being reflected by the reflecting plate, so that the urea concentration is measured; the second ultrasonic wave transduction piece is arranged at the bottom of the groove, the second ultrasonic wave emitted by the second ultrasonic wave transduction piece is used for measuring the urea liquid level, the second ultrasonic wave reaches the liquid level of the urea solution and is reflected, and the reflected second ultrasonic wave is received by the second ultrasonic wave transduction piece, so that the urea liquid level is measured; integrates the functions of measuring the liquid level and measuring the concentration of the urea solution. However, the mounting seat is fixedly inserted into the bottom wall of the urea box, the size of the mounting seat is large, and a large opening is dug at the bottom of the urea box, so that the urea box is not only inconvenient to process, but also the sealing effect between the mounting seat and the urea box is difficult to ensure.

Disclosure of utility model

The technical problems to be solved by the utility model are as follows: the existing urea sensor is characterized in that a sensor shell is fixedly inserted into the bottom wall of a urea box, so that the urea box is inconvenient to process, and tightness between the sensor shell and the urea box is difficult to ensure.

In order to solve the above technical problem, an object of the present utility model is to provide a urea sensor, including:

The circuit board is arranged in the sealing cavity, and a first groove with an upward opening is arranged at the top of the sealing shell;

The first detection probe is arranged at the groove wall of the first side of the first groove;

The reflecting sheet is arranged on the second side groove wall of the first groove, and the reflecting sheet and the first detection probe are oppositely arranged at intervals;

The second detection probe is arranged at the bottom wall of the first groove and is upwards arranged; the second detection probe and the first detection probe are electrically connected with the circuit board;

the upper end of the connecting rod is fixed with the inner side of the box cover of the urea box, and the lower end of the connecting rod is connected with the sealing shell.

Preferably, the box cover is arranged on an opening of the urea box, and the cross section size of the opening is larger than the outer contour size of the sealing shell.

Preferably, the sealing shell is connected with a pipe body communicated with the sealing cavity, and one end of the pipe body, which is far away from the sealing shell, passes through the box cover in a sealing way;

The circuit board is connected with a cable, and one end of the cable, which is far away from the circuit board, passes through the pipe cavity of the pipe body and extends out of the pipe cavity of the pipe body.

Preferably, a first mounting hole communicated with the sealing cavity is formed in the bottom wall of the first groove, and the second detection probe is inserted into the first mounting hole in a sealing mode.

As a preferable scheme, the bottom of the sealing shell is provided with a second groove with a downward opening, a first end cover is covered at the notch of the second groove, and the first end cover and the groove wall of the second groove enclose to form the sealing cavity.

Preferably, the sealing cavity comprises a first cavity body positioned below the first groove and a second cavity body positioned at one side of the first groove, the first detection probe is arranged in the second cavity body, and the second detection probe is fixedly attached to the cavity wall of the second cavity body.

As a preferable scheme, the urea sensor further comprises a temperature sensor arranged in the sealing cavity, a detection head of the temperature sensor is attached to the cavity wall of the sealing cavity, and the temperature sensor is electrically connected with the circuit board.

Preferably, a heat-conducting adhesive is arranged between the detection head of the temperature sensor and the cavity wall of the sealing cavity.

Preferably, the connecting rod is a threaded telescopic rod.

Compared with the prior art, the utility model has the beneficial effects that:

The urea sensor comprises a sealing shell, a first detection probe, a reflecting sheet, a second detection probe and a connecting rod, wherein the sealing shell is provided with a sealing cavity, a circuit board is arranged in the sealing cavity, the top of the sealing shell is provided with a first groove with an upward opening, the wall of a first side groove of the first groove is provided with the first detection probe, the wall of a second side groove of the first groove is provided with the reflecting sheet, and the reflecting sheet and the first detection probe are oppositely arranged at intervals; a second detection probe is arranged at the bottom wall of the first groove and is upwards arranged; the first detection probe and the second detection probe are electrically connected with the circuit board, so that the detection of the liquid level and the concentration of urea is realized; the upper end of connecting rod is fixed with the inboard of case lid, and the seal shell is connected to the lower extreme of connecting rod, does not need to offer the mounting hole that is used for installing urea sensor at the diapire of urea case, is convenient for the processing of urea case, has guaranteed moreover that the seal of urea case is good.

Drawings

FIG. 1 is a schematic view of the urea sensor of the present utility model installed in a urea tank;

FIG. 2 is a schematic diagram of a urea sensor;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

In the figure, 100, a urea box, 1, a box cover, 2, a connecting rod, 3, a sealing shell, 31, a sealing cavity, 311, a first cavity, 312, a second cavity, 32, a first groove, 321, a first mounting hole, 33, a first detection probe, 34, a reflecting sheet, 35, a second detection probe, 36, a first end cover, 37, a second end cover, 4, a circuit board, 5, a pipe body, 6, a cable, 7, a temperature sensor, 8 and heat conducting glue.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the utility model.

As shown in fig. 1 to 3, a preferred embodiment of the urea sensor of the present utility model comprises:

The sealing shell 3, the sealing shell 3 is provided with a sealing cavity 31, a circuit board 4 is arranged in the sealing cavity 31, and the top of the sealing shell 3 is provided with a first groove 32 with an upward opening;

A first detection probe 33, the first detection probe 33 being disposed at a first side groove wall of the first groove 32;

The reflecting sheet 34 is arranged on the second side groove wall of the first groove 32, and the reflecting sheet 34 and the first detection probe 33 are arranged at intervals;

A second detection probe 35, the second detection probe 35 being disposed at the bottom wall of the first recess 32, the second detection probe 35 being disposed upward; the second detection probe 35 and the first detection probe 33 are electrically connected with the circuit board 4;

The upper end of the connecting rod 2 is fixed with the inner side of the box cover 1 of the urea box 100, and the lower end of the connecting rod 2 is connected with the sealing shell 3.

Specifically, the first detection probe 33 and the second detection probe 35 are both ultrasonic probes, the ultrasonic waves emitted by the first detection probe 33 propagate in the direction of the reflecting sheet 34 through the urea solution, and after being reflected by the reflecting sheet 34, the reflected ultrasonic waves are received by the first detection probe 33, so that the concentration of the urea solution at the position is measured. The ultrasonic wave emitted by the second detection probe 35 propagates upward, reflects the liquid level of the urea solution, and is received by the second detection probe 35, thereby measuring the liquid level of the urea solution. The urea sensor is connected to the lower end of the connecting rod 2, and a mounting hole for mounting the urea sensor is not required to be formed in the bottom wall of the urea box 100, so that the urea box 100 can be conveniently processed.

In this embodiment, trompil on the urea case 100 is equipped with the tubulose portion of upwards convex, the outside of tubulose portion is equipped with the external screw thread, case lid 1 includes circular roof portion, the lower extreme week side of circular roof portion is equipped with the annular flange portion of bellied downwards, the inboard of annular flange portion is equipped with the internal screw thread, case lid 1 passes through annular flange portion and tubulose portion spiro union, the upper end of connecting rod 2 is fixed at the middle part of roof portion, connect urea sensor at connecting rod 2 lower extreme, do not need to offer the mounting hole that is used for installing urea sensor at the diapire of urea case 100, the processing of urea case 100 of being convenient for. Wherein the cross-sectional dimension of the opening is larger than the outer dimension of the sealing shell 3. Specifically, the lumen diameter of the tubular portion is larger than the outer dimension of the seal case 3, so that the urea sensor can pass out of the urea tank 100 along with the connecting rod 2 from the opening of the urea tank 100 or be incorporated into the urea tank 100.

In the embodiment, the sealing shell 3 is connected with a pipe body 5 communicated with the sealing cavity 31, and one end of the pipe body 5 away from the sealing shell 3 passes through the box cover 1 in a sealing way; the cable 6 is worn to establish in the lumen of body 5, and the one end and the circuit board 4 electricity of cable 6 are connected, and the other end of cable 6 extends outside body 5. The arrangement of the pipe body 5 can avoid the leakage of urea solution at the connection node between the cable 6 and the sealing shell 3, and ensures the good sealing of the urea sensor.

Since the measuring distance of the second detecting probe 35 is long, in this embodiment, the bottom wall of the first groove 32 is provided with a first mounting hole 321 communicating with the sealing cavity 31, and the second detecting probe 35 is inserted in the first mounting hole 321 in a sealing manner. The measuring end of the second detecting probe 35 penetrates out from the bottom wall of the first groove 32, so that the liquid level height that can be measured by the second detecting probe 35 is higher, and in other embodiments of the present utility model, the second detecting probe 35 may not protrude from the bottom wall of the first groove 32, and the measuring depth of the second detecting probe 35 is ensured by increasing the power of the second detecting probe 35.

In this embodiment, the bottom of the sealing shell 3 is provided with a second groove 36 with a downward opening, a first end cover 36 is covered at the notch of the second groove 36, and the first end cover 36 and the groove wall of the second groove 36 enclose a sealing cavity 31. Specifically, the first end cap 36 is engaged with an end portion of the peripheral groove wall of the second groove 36 by a fastener, and a seal ring is provided between the first end cap 36 and the peripheral groove wall of the second groove 36. Wherein, the upper end and the first recess 32 intercommunication of first mounting hole 321, the lower extreme and the second recess 36 intercommunication of first mounting hole 321, the lower extreme of first mounting hole 321 is connected with second end cover 37 through the fastener, first mounting hole 321 is the shoulder hole, the upper portion of first mounting hole 321 is the lower part hole that the aperture is less, the lower part of first mounting hole 321 is the lower part hole that the aperture is great, the shape of second test probe 35 includes the lower part cylinder that the diameter is less and the diameter is great, upper part cylinder is inserted and is established in the upper part hole, lower part cylinder is inserted and is established in the lower part hole, the outside cover of upper part cylinder is equipped with the sealing washer, second end cover 37 upwards pushes up the second test probe 35 that sets up in first mounting hole 321, can realize the sealing of second test probe 35 and first mounting hole 321.

Since the measurement distance of the first detection probe 33 is shorter, in this embodiment, the sealing cavity 31 includes a first cavity 311 located below the first groove 32 and a second cavity 312 located at one side of the first groove 32, the first detection probe 33 is disposed in the second cavity 312, and the first detection probe 33 is fixedly attached to the cavity wall of the second cavity 312. Specifically, epoxy resin is poured into the second cavity 312 to fix the first detection probe 33.

In this embodiment, the urea sensor further includes a temperature sensor 7 disposed in the sealed cavity 31, a detection head of the temperature sensor 7 is attached to a cavity wall of the sealed cavity 31, and the temperature sensor 7 is electrically connected to the circuit board 4. Specifically, the urea sensor is immersed in the urea solution, the temperature of the urea solution can be obtained by measuring the temperature of the cavity wall of the sealing cavity 31, and the calculation formula of the urea concentration is corrected and compensated according to the temperature of the urea solution, so that the measurement accuracy of the urea concentration is improved.

Further, a heat-conducting adhesive 8 is provided between the detection head of the temperature sensor 7 and the cavity wall of the seal cavity 31.

In order to facilitate adjustment of the installation depth of the urea sensor, in this embodiment, the connecting rod 2 is a threaded telescopic rod. Specifically, there are multiple structural style of screw thread telescopic link, in this embodiment, the screw thread telescopic link includes the swivel nut and inserts the screw rod of establishing in the swivel nut, and the screw rod is fixed with case lid 1, and urea sensor connects the lower extreme at the swivel nut, and locking screw is worn to be equipped with by the lateral wall of swivel nut, after adjusting the length of screw thread telescopic link in place, rotatory locking screw for locking screw's screw thread end passes the lateral wall of swivel nut and with the periphery side butt of screw rod, realizes the locking to the screw rod, thereby makes the length of screw thread telescopic link keep fixed.

In summary, the urea sensor comprises a sealing shell, a first detection probe, a reflecting plate, a second detection probe and a connecting rod, wherein the sealing shell is provided with a sealing cavity, a circuit board is arranged in the sealing cavity, the top of the sealing shell is provided with a first groove with an upward opening, the wall of a first side groove of the first groove is provided with the first detection probe, the wall of a second side groove of the first groove is provided with the reflecting plate, and the reflecting plate and the first detection probe are oppositely arranged at intervals; a second detection probe is arranged at the bottom wall of the first groove and is upwards arranged; the first detection probe and the second detection probe are electrically connected with the circuit board, so that the detection of the liquid level and the concentration of urea is realized; the upper end of connecting rod is fixed with the inboard of case lid, and the seal shell is connected to the lower extreme of connecting rod, does not need to offer the mounting hole that is used for installing urea sensor at the diapire of urea case, is convenient for the processing of urea case, has guaranteed moreover that the seal of urea case is good.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims

1. A urea sensor, comprising:

The circuit board comprises a sealing shell (3), wherein the sealing shell (3) is provided with a sealing cavity (31), a circuit board (4) is arranged in the sealing cavity (31), and the top of the sealing shell (3) is provided with a first groove (32) with an upward opening;

A first detection probe (33), the first detection probe (33) being arranged at a first side groove wall of the first groove (32);

The reflecting sheet (34) is arranged on the second side groove wall of the first groove (32), and the reflecting sheet (34) and the first detection probe (33) are arranged at intervals in a relative mode;

A second detection probe (35), the second detection probe (35) being arranged at the bottom wall of the first groove (32), the second detection probe (35) being arranged upwards; the second detection probe (35) and the first detection probe (33) are electrically connected with the circuit board (4);

the upper end of the connecting rod (2) is fixed with the inner side of the box cover (1) of the urea box (100), and the lower end of the connecting rod (2) is connected with the sealing shell (3).

2. Urea sensor according to claim 1, characterized in that the tank cover (1) is arranged over an opening of the urea tank (100), the cross-sectional dimension of which opening is larger than the outer dimension of the sealing shell (3).

3. Urea sensor according to claim 1, characterized in that the sealing shell (3) is connected with a tube (5) communicating with the sealing chamber (31), the end of the tube (5) remote from the sealing shell (3) being sealed through the tank cover (1);

the circuit board (4) is connected with a cable (6), and one end, far away from the circuit board (4), of the cable (6) penetrates through the pipe cavity of the pipe body (5) and extends out of the pipe cavity of the pipe body (5).

4. Urea sensor according to claim 1, characterized in that the bottom wall of the first recess (32) is provided with a first mounting hole (321) communicating with the sealing chamber (31), the second detection probe (35) being sealingly inserted in the first mounting hole (321).

5. Urea sensor according to claim 1, characterized in that the bottom of the sealing shell (3) is provided with a second groove (36) with a downward opening, the notch of the second groove (36) is covered with a first end cover (37), and the first end cover (37) and the groove wall of the second groove (36) enclose the sealing cavity (31).

6. Urea sensor according to claim 1, characterized in that the sealed cavity (31) comprises a first cavity (311) below the first recess (32) and a second cavity (312) at one side of the first recess (32), the first detection probe (33) is arranged in the second cavity (312), and the second detection probe (35) is fixedly attached to the cavity wall of the second cavity (312).

7. Urea sensor according to claim 1, characterized in that it further comprises a temperature sensor (7) arranged in the sealed cavity (31), the detection head of the temperature sensor (7) being in contact with the cavity wall of the sealed cavity (31), the temperature sensor (7) being electrically connected to the circuit board (4).

8. Urea sensor according to claim 7, characterized in that a heat conducting glue (8) is provided between the detection head of the temperature sensor (7) and the chamber wall of the sealing chamber (31).

9. Urea sensor according to claim 1, characterized in that the connecting rod (2) is a threaded telescopic rod.