CN211652687U - Assembled sealed urea sensor - Google Patents

Abstract

The utility model discloses an assembled and sealed urea sensor. A wire harness and a wire harness sealing casing are assembled through a clamping block and a clamping groove, and sealed by a sealing ring; an energy-converting sheet is attached to the inner bottom of an ultrasonic transceiver casing and is sealed. It is pressed by the sealing block; the wire harness sealing shell and the ultrasonic transceiver shell are locked by the locking mechanism, and one end of the fixed bracket is locked and fixed, and the sealing between the wire harness sealing shell and the ultrasonic transceiver shell is realized by the sealing convex ring; The other end has a reflective surface parallel to the transducer sheet, and the positive and negative wire bundles of the transducer sheet are gathered through the bundler. The utility model realizes the sealing through the design of the clamping block of the wire harness housing and the clamping groove on the wire harness sealing case, and the sealing convex ring between the wire harness sealing case and the ultrasonic transceiver case, which can realize rapid assembly and effectively ensure the sealing performance, and Accuracy of ultrasonic detection of liquid level and urea concentration.

Description

Assembling the sealed urea sensor

technical field

The utility model relates to the technical field of sensors, in particular to an assembled and sealed urea sensor used in a vehicle urea tank.

Background technique

With the increasingly serious environmental pollution and the increasing number of vehicles, national regulations have become increasingly stringent on vehicle emissions. The exhaust gas of automobiles, especially diesel vehicles, contains nitrogen oxides, and the direct emission of nitrogen oxides will cause serious air pollution. Therefore, the selective catalytic reduction (Selective Catalytic Reduction, SCR) aftertreatment system is an effective way to reduce the amount of pollutants in the exhaust gas. has been widely used. SCR utilizes the decomposition of urea to generate NH ₃ , and under the action of a catalyst, NH ₃ reacts with NO _x to reduce the emission of NO _x in the exhaust gas.

SCR technology has been widely applied to National IV and National V vehicles, and with the official implementation of the National VI standard, higher requirements for _NOx emissions in exhaust gas are required, so a more effective SCR system is required. The SCR system includes a urea tank filled with urea solution, and a urea level sensor needs to be installed on the urea tank. The function of the urea sensor is not only to detect the level of urea, but also to detect the concentration of urea solution by using the principle of ultrasonic waves to ensure NO _x Degradation effectiveness.

In the actual production and use process of the urea sensor, its assembly efficiency and tightness are the keys to reducing the production cost, service life and performance. However, the sensor in the prior art is usually complicated in structure, so the production cost is high and it is easy to leak during use. Once the liquid penetrates into the sensor, it will not only affect the conductivity, but also affect the detection accuracy of the ultrasonic wave, which will lead to a large deviation in the detection accuracy of the liquid level and urea concentration, which will directly lead to the degradation of _NOx . The effectiveness cannot be guaranteed, thus failing to meet the requirements of the relevant emission standards.

Utility model content

In order to solve the above technical problems, the utility model provides an assembled and sealed urea sensor, which includes a wire harness, a wire harness, a sealing ring, a wire harness sealing shell, a sealing block, an energy converter, an ultrasonic transceiver shell and a fixing bracket;

The assembly of the wire harness and the wire harness sealing case is realized through the cooperation of the clamping block of the wire harness housing with the clamping groove on the wire harness sealing case, and the sealing between the wire harness and the wire harness sealing case is realized. ring to achieve sealing;

The transducer sheet is attached to the inner bottom of the ultrasonic transceiver shell, and the sealing block is filled inside the ultrasonic transceiver shell, so that the transducer sheet is attached to the space between the sealing block and the ultrasonic transceiver shell. between the bottom;

The wire harness sealing case and the ultrasonic transceiver case are locked by a locking mechanism, and at the same time, they are locked and fixed with one end of the fixing bracket, so as to press the sealing block and the transducer sheet on the wire harness sealing case and the ultrasonic transceiver case. between, and realize the sealing between the wire harness sealing shell and the ultrasonic transceiver shell through the sealing convex ring;

The other end of the fixing bracket has a reflective surface parallel to the transducer sheet, and the wire harness connected to the positive and negative electrodes of the transducer sheet passes through the sealing block and the wire harness sealing shell in turn and passes through the wire harness Connect to an external controller after hub.

Further, the inside of the wire harness sealing case is provided with an accommodating groove 1 for accommodating the excess length of the wire harness after the wire harness is welded and connected to the transducer sheet.

Further, the bottom of the sealing block is provided with a second accommodating groove for accommodating the transducer sheet, and the depth of the second accommodating groove is smaller than the thickness of the transducer sheet.

Wherein, the sealing convex ring and the sealing block are integrally formed in a conjoined structure.

Further, a temperature sensor is also provided, and the temperature sensor is attached between the sealing block and the side of the ultrasonic transceiver housing. Wherein, the inner wall of the ultrasonic transceiver casing is provided with a groove for accommodating the temperature sensor; or, the outer wall of the sealing block is provided with a groove for accommodating the temperature sensor, and the wire harness of the temperature sensor passes through Pass through the sealing block and gather with the positive and negative wire bundles of the transducer sheet and pass through the wire harness; or, the inner wall of the ultrasonic transceiver shell and the outer wall of the The groove of the temperature sensor, the temperature sensor is clamped between the inner wall groove of the ultrasonic transceiver shell and the outer wall groove of the sealing block, and the wire harness of the temperature sensor passes through the sealing block and is connected with the The positive and negative wire bundles of the transducer are collected and passed through the wire harness.

Further, the outer side of the fixing bracket is wrapped with a layer of porous shell, and the through holes provided on the porous shell can realize the circulation of the urea solution and reduce the influence of air bubbles on the detection accuracy.

Through the above-mentioned technical scheme, the utility model has the following beneficial effects:

1. When the sealed connection between the wire harness and the wire harness sealing shell is achieved through the sealing ring, the fast assembly of the wire harness and the wire harness sealing shell can be realized through the design of the clamping block of the wire harness shell and the groove on the wire harness sealing shell. And avoid the twisting or cracking of the sealing ring that may be caused by screwing and assembling in the prior art, thereby effectively ensuring the sealing;

2. Sealing between the wire harness sealing shell and the ultrasonic transceiver shell is realized by a sealing convex ring, and the wire harness sealing shell and the ultrasonic transceiver shell are locked by a locking mechanism and locked and fixed with one end of the fixed bracket at the same time. The sealing between the ultrasonic transceiver shells achieves rapid assembly and greatly improves the assembly efficiency;

3. This structure can ensure the flush and close fit between the transducer and the bottom of the ultrasonic transceiver housing, thus ensuring the accuracy of ultrasonic detection of liquid level and urea concentration;

4. The arrangement of the porous shell on the outer side of the fixed bracket can effectively reduce the generation of air bubbles and reduce the influence of the existence of air bubbles on the accuracy of ultrasonic detection while realizing the circulation of the urea solution by using the through holes provided on the porous shell.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present utility model more clearly, the accompanying drawings required to be used in the description of the embodiments will be briefly introduced below.

Fig. 1 is the exploded structure schematic diagram of a kind of optimized structure of urea sensor in the embodiment;

Fig. 2 is the sectional structure schematic diagram of a kind of optimized structure of urea sensor in the embodiment;

3 is a schematic diagram of an ultrasonic transceiver housing and a sealing block having two accommodating grooves in the embodiment;

FIG. 4 is a schematic diagram of the ultrasonic transceiver housing and the sealing block without the second accommodating groove in the embodiment.

In the picture: 10. Wire harness; 20. Wire harness; 21. Block; 30. Sealing ring; 40. Harness sealing shell; ; 61. Sealing convex ring; 62. Receiving groove two; 70. Transducer; 80. Ultrasonic transceiver shell; 90. Fixed bracket; 100. Temperature sensor.

Detailed ways

Referring to Figures 1 and 2, the assembled sealed urea sensor provided by the present invention includes a wire harness 10, a wire harness 20, a sealing ring 30, a wire harness sealing shell 40, a sealing block 60, a transducer 70, an ultrasonic transceiver shell 80 and a fixed Bracket 90; the assembly of the wire harness 20 and the wire harness sealing case 40 is realized through the clamping block 21 of the housing of the wire harness 20 and the slot 41 on the wire harness sealing case 40, and the assembly between the wire harness 20 and the wire harness sealing case 40 is realized The sealing ring 30 realizes sealing; the transducer sheet 70 is attached to the inner bottom of the ultrasonic transceiver housing 80 , and the sealing block 60 is filled inside the ultrasonic transceiver enclosure 80 so that the transducer sheet 70 is attached to the bottom of the sealing block 60 and the ultrasonic transceiver enclosure 80 between; the harness sealing shell 40 and the ultrasonic transceiver shell 80 are locked by locking mechanisms such as bolts and nuts 50, and at the same time, they are locked and fixed with one end of the fixing bracket 90 to press the sealing block 60 and the transducer sheet 70 against the wire harness sealing shell. 40 and the ultrasonic transceiver shell 80, and through the sealing convex ring 61 of the conjoined structure formed integrally with the sealing block 60 to realize the sealing between the wire harness sealing shell 40 and the ultrasonic transceiver shell 80; the other end of the fixing bracket 90 has a The reflective surface of the transducer sheet 70 is parallel, and the wire harness 10 connected to the positive and negative electrodes of the transducer sheet 70 passes through the sealing block 60 and the wire harness sealing shell 40 in turn, and is connected to the external controller after passing through the wire harness 20. The inside of the sealing shell 40 has an accommodating groove-42 for accommodating the remaining length of the wire harness 10 after the wire harness 10 and the transducer sheet 70 are welded and connected; The through hole of the urea solution reduces the influence of air bubbles on the detection accuracy while realizing the circulation of urea solution.

In addition, a temperature sensor 100 is provided, and the temperature sensor 100 is attached between the sealing block 60 and the side of the ultrasonic transceiver housing 80 . Wherein, the inner side wall of the ultrasonic transceiver housing 80 is provided with a groove for accommodating the temperature sensor 100; or, the outer side wall of the sealing block 60 is provided with a groove for accommodating the temperature sensor 100, and the wire harness 10 of the temperature sensor 100 passes through the seal The block 60 and the positive and negative wire bundles 10 of the transducer sheet 70 are collected and assembled through the wire harness 20; , the temperature sensor 100 is clamped between the inner wall groove of the ultrasonic transceiver shell 80 and the outer wall groove of the sealing block 60, and the wire harness 10 of the temperature sensor 100 passes through the sealing block 60 and is connected with the positive and negative wire harness 10 of the transducer plate 70. Assemble and gather the wires through the wire harness 20.

When assembling this embodiment, firstly, the wire harness 10 of the positive and negative electrodes of the transducer sheet 70 is passed through the sealing block 60 to the other end and welded with the transducer sheet 70, and then the sealing block 60 is filled into the ultrasonic transceiver housing 80. So that the transducer piece 70 is directly clamped between the bottom of the sealing block 60 and the bottom of the ultrasonic transceiver housing 80 as shown in FIG. 4 (or as shown in FIG. The second accommodating slot 62, and the depth of the second accommodating slot 62 is smaller than the thickness of the transducer sheet 70, so that the transducer sheet 70 and the positive and negative wire harness 10 are first accommodated in the second accommodating slot 62 after welding, and then the The sealing block 60 is filled into the ultrasonic transceiver casing 80 so that the transducer piece 70 is clamped between the bottom of the sealing block 60 and the bottom of the ultrasonic transceiver casing 80, and the comparison is not specifically limited); The wire harness sealing shell 40 is locked with the ultrasonic transceiver shell 80 and at the same time is locked and fixed with one end of the fixing bracket 90, and the sealing convex ring 61 of the sealing block 60 is used to realize the sealing between the wire harness sealing shell 40 and the ultrasonic transceiver shell 80; The positive and negative wire harness 10 of the transducer sheet 70 and the wire harness 10 of the temperature sensor 100 are collected and passed through the wire harness 20 to be assembled, and realized by the clamping block 21 of the housing of the wire harness 20 and the clamping slot 41 on the wire harness sealing shell 40 The wire harness 20 and the wire harness sealing shell 40 are quickly assembled, and the sealing ring 30 is used to realize the sealing between the wire harness 20 and the wire harness sealing shell 40;

When this embodiment is in operation, the urea solution in the urea tank will circulate inside and outside the porous shell through the through holes of the porous shell, and the arrangement of the through holes can effectively prevent the generation of air bubbles from adversely affecting the detection accuracy, and the transducer plate 70 generates ultrasonic waves. And send out the ultrasonic wave through the ultrasonic transceiver shell 80 which is closely attached to it, and use the reflective surface parallel to the transducer sheet 70 at the other end of the fixed bracket 90 to reflect the ultrasonic wave and receive the reflected ultrasonic wave through the transducer sheet 70, so that the controller calculates The transmission rate and transmission time of the fixed frequency ultrasonic waves in the urea and the temperature of the urea solution are obtained synchronously through the temperature sensor 100, so as to calculate the liquid level and concentration of the urea solution in the urea tank, and sequentially realize the liquid level of the urea solution in the urea tank. Real-time monitoring of level, temperature and concentration.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above-described embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The assembled and sealed urea sensor is characterized by comprising a wiring harness (10), a wiring harness device (20), a sealing ring (30), a wiring harness sealing shell (40), a sealing block (60), a transducer piece (70), an ultrasonic receiving and transmitting shell (80) and a fixing support (90);

the assembling of the wire harness (20) and the wire harness sealing shell (40) is realized through the matching of a clamping block (21) of the shell of the wire harness (20) and a clamping groove (41) on the wire harness sealing shell (40), and the sealing is realized through the sealing ring (30) between the wire harness (20) and the wire harness sealing shell (40);

the transducer plate (70) is attached to the inner bottom of the ultrasonic transceiver shell (80), and the sealing block (60) is filled in the ultrasonic transceiver shell (80) so that the transducer plate (70) is attached between the sealing block (60) and the bottom of the ultrasonic transceiver shell (80);

the wire harness sealing shell (40) and the ultrasonic transceiving shell (80) are locked through a locking mechanism and are simultaneously locked and fixed with one end of the fixing support (90) so as to tightly press the sealing block (60) and the energy conversion sheet (70) between the wire harness sealing shell (40) and the ultrasonic transceiving shell (80), and the sealing between the wire harness sealing shell (40) and the ultrasonic transceiving shell (80) is realized through the sealing convex ring (61);

the other end of the fixed support (90) is provided with a reflecting surface parallel to the transduction sheet (70), and a wiring harness (10) connected with the anode and the cathode of the transduction sheet (70) sequentially penetrates through the sealing block (60) and the wiring harness sealing shell (40) and is connected to an external controller after being concentrated by the wiring harness device (20).

2. The assembled sealed urea sensor according to claim 1, wherein the wire harness sealing housing (40) has a first accommodating groove (42) therein for accommodating an excess length portion of the wire harness (10) after the wire harness (10) is welded to the transducer chip (70).

3. The assembled sealed urea sensor according to claim 1, wherein the bottom of the sealing block (60) is provided with a second accommodating groove (62) for accommodating the transducer chip (70), and the depth of the second accommodating groove (62) is smaller than the thickness of the transducer chip (70).

4. The assembled and sealed urea sensor according to claim 1, wherein the sealing flange (61) and the sealing block (60) are of an integral structure.

5. The assembled sealed urea sensor according to claim 1, further comprising a temperature sensor (100), wherein the temperature sensor (100) is fitted between the sealing block (60) and the side of the ultrasound transceiver housing (80).

6. Assembled capsule urea sensor according to claim 5, characterized in that the inner side wall of said ultrasound transceiver housing (80) is provided with a groove for housing said temperature sensor (100).

7. The assembled sealed urea sensor according to claim 5, wherein the outer side wall of the sealing block (60) is provided with a groove for accommodating the temperature sensor (100), and the wiring harness (10) of the temperature sensor (100) passes through the sealing block (60) and is converged with the positive and negative wiring harnesses (10) of the transducer sheet (70) and is converged through the wiring harness (20).

8. The assembled sealed urea sensor according to claim 5, wherein the inner side wall of the ultrasonic transceiver housing (80) and the outer side wall of the sealing block (60) are both provided with a groove corresponding to the temperature sensor (100), the temperature sensor (100) is clamped between the inner side wall groove of the ultrasonic transceiver housing (80) and the outer side wall groove of the sealing block (60), and the wiring harness (10) of the temperature sensor (100) passes through the sealing block (60) and is converged with the positive and negative wiring harnesses (10) of the transducer sheet (70) and is converged through the wire harness (20).

9. The assembled and sealed urea sensor according to claim 1, wherein the fixed support (90) is covered with a porous shell on the outer side, and the influence of air bubbles on the detection precision is reduced while the urea solution is circulated through the through holes arranged on the porous shell.

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