阅读说明：本技术 一种可调式尿素溶液浓度检测装置 (Adjustable urea solution concentration detection device ) 是由 王愉琴 石九玉 周轩 刘庭杰 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种可调式尿素溶液浓度检测装置,其涉及汽车检测装置领域,其包括可调式型腔、换能器和线束(引出电缆)；换能器通过灌封胶固定在可调型腔的合适位置,线束通过锡焊与换能器连接；可调型腔包括反射回波的挡板和通过螺纹旋转实现飞行间距调节的结构,换能器起到能量转化和接收回波信号的作用,将输入的电功率转化成机械功率(超声波)再发射出去,同时接收反射回波信号,线束(引出电缆)用于传输换能器的电信号。(The invention discloses an adjustable urea solution concentration detection device, which relates to the field of automobile detection devices and comprises an adjustable cavity, an energy converter and a wire harness (a lead-out cable); the energy converter is fixed at a proper position of the adjustable cavity through pouring sealant, and the wire harness is connected with the energy converter through soldering; the adjustable cavity comprises a baffle for reflecting echo and a structure for realizing flight distance adjustment through thread rotation, the energy converter plays a role in energy conversion and receiving echo signals, input electric power is converted into mechanical power (ultrasonic waves) and then emitted, the reflected echo signals are received, and a wiring harness (a lead-out cable) is used for transmitting electric signals of the energy converter.)

1. The utility model provides a urea solution concentration detection device with adjustable, includes transducer (2), the transducer passes through pouring sealant (21) to be fixed in thin-walled shell (13), and this thin-walled shell (13) and adjustable die cavity shell (11) one end pass through laser welding or sealed gluey an organic whole that becomes its characterized in that: the other end of the adjustable cavity shell (11) is provided with an internal thread (112), an adjusting screw (12) is screwed in the internal thread, and the distance L between the end face (126) of the adjusting screw and the outer wall of the thin-wall shell (13) is changed by rotating the adjusting screw (12), so that the adjustable function is realized, and the adjustable flight time of the ultrasonic wave of the transducer (2) in the urea solution of the adjustable cavity (1) is realized;

a plurality of through holes (111) are formed in the circumferential direction of the adjustable cavity shell (11) from outside to inside;

the wiring harness (3) of the transducer (2) is fixed with a PG type cable waterproof joint (4),

the transducer (2) outputs a signal detection to the analog front end through the wiring harness (3).

2. The adjustable urea solution concentration detection device according to claim 1, wherein: the thin-wall shell (13) is made of stainless steel, wherein the wall thickness of the joint face of the thin-wall shell (13) and the transducer (2) is 0.5-1.0 mm.

3. The adjustable urea solution concentration detection device according to claim 1, wherein: the transition fillet (127) of the adjusting screw end face (126) is not more than R0.5mm; or the chamfer (127) of the adjusting screw end face (126) is not more than C0.5mm.

4. The adjustable urea solution concentration detection device according to claim 1 or 3, wherein: a blind hole (121) is formed in the circumferential direction of the adjustable screw (12), and a spring (123) and a steel ball (122) are mounted in the blind hole (121); the adjustable cavity shell (11) is characterized in that a groove (113) is formed in the inner wall of the adjustable cavity shell along the axis, and the steel ball (122) is propped in the groove (113) through a spring (123).

5. The adjustable urea solution concentration detection device according to claim 4, wherein: the number of the grooves (113) is three, and the two sides of the grooves (113) are in smooth transition with the inner wall of the adjustable cavity shell (11).

6. The adjustable urea solution concentration detection device according to claim 4, wherein: the thread for connecting the adjusting screw (12) and the adjustable cavity shell (11) adopts a thread pitch of 1.5 mm.

7. The adjustable urea solution concentration detection device according to claim 6, wherein: one or more radial seal grooves (124) are arranged between the adjusting screw (12) and the adjustable cavity shell (11), and an O-shaped ring (125) is installed.

8. The adjustable urea solution concentration detection device according to claim 1, 5, 6 or 7, wherein: the adjustable cavity shell is provided with an anti-rotation structure (114).

Technical Field

The invention relates to an SCR urea solution injection system for tail gas treatment of a national six-diesel vehicle, in particular to a multi-adjustable urea solution concentration detection device for detecting the concentration of a urea solution.

Background

The urea solution concentration detection device in the SCR urea solution injection system for the tail gas treatment of the six diesel vehicles is used for detecting the concentration of the urea solution and further providing a certain amount of urea solution to the SCR urea solution injection system as required, so that the accuracy of the detection device for detecting the concentration of the urea solution is particularly important. The existing urea solution concentration detection device has a cavity with a fixed interval (which is not adjustable), and is assembled into a whole by welding or screw connection. When the concentration wave of the urea solution changes, the time required by the transducer from transmitting ultrasonic waves to receiving ultrasonic echo signals is different, so that the flight speed in the ultrasonic urea solution can be calculated, and the concentration of the urea solution corresponding to different flight speeds can be calculated through data processing.

The application numbers are: 002363593 provides a rotary device that produces a sound and location effect when rotating, and provides a rotary device that provides sound and location, but is more complex and limited in its particular use.

Disclosure of Invention

Aiming at the unadjustable cavity in the prior art, the invention provides an adjustable urea solution concentration detection device, which can realize the adjustment of the flying distance while realizing the detection of the concentration of the urea solution.

Therefore, the technical scheme of the invention is as follows: the utility model provides a urea solution concentration detection device with adjustable, includes the transducer, the transducer passes through the pouring sealant to be fixed in thin-walled shell, and this thin-walled shell and adjustable die cavity shell one end pass through laser welding or sealed gluey an organic whole that becomes its characterized in that: the other end of the adjustable cavity shell is provided with internal threads, and the internal threads are screwed with an adjusting screw, wherein the distance L between the end face of the adjusting screw and the outer wall of the thin-wall shell is changed by rotating the adjusting screw, so that the adjustable function is realized, and the adjustable flight time of the ultrasonic wave of the transducer in the urea solution in the adjustable cavity is realized;

a plurality of through holes are formed in the circumferential direction of the adjustable cavity shell from outside to inside;

the wiring harness of the transducer is fixed with the waterproof joint of the PG type cable,

the transducer outputs a signal detection through the wiring harness to the analog front end.

The further improvement lies in that: the thin-wall shell is made of stainless steel, wherein the wall thickness of the joint face of the thin-wall shell and the transducer is 0.5-1.0 mm.

The further improvement lies in that: the transition fillet of the end face of the adjusting screw is not more than R0.5mm; or the chamfer angle of the end surface of the adjusting screw is not more than C0.5mm.

The further improvement lies in that: a blind hole is formed in the circumferential direction of the adjustable screw, and a spring and a steel ball are mounted in the blind hole; the inner wall of the adjustable cavity shell is provided with a groove along the axis, and the steel ball is propped in the groove through a spring.

The further improvement lies in that: the number of the grooves is three, and the two sides of the groove are in smooth transition with the inner wall of the adjustable cavity shell.

The further improvement lies in that: the thread for connecting the adjusting screw and the adjustable cavity shell adopts a thread pitch of 1.5 mm.

The further improvement lies in that: one or more radial seal grooves are arranged between the adjusting screw and the adjustable cavity shell and are used for installing a rubber O-shaped ring for sealing.

The further improvement lies in that: the adjustable cavity shell is provided with an anti-rotation structure, so that the adjustable cavity is prevented from rotating after installation and fixation.

Has the advantages that:

according to the invention, the adjusting screw is screwed into the connecting structure by utilizing the adjusting screw thread, and the distance L between the end surface of the adjusting screw and the outer wall of the thin-wall shell is changed by rotating the adjusting screw, so that the adjusting function is realized, and the adjustable flight time of the ultrasonic wave of the transducer in the urea solution in the adjustable cavity is realized; the adjustable cavity shell is further provided with a through hole, so that the urea solution can be filled in the adjustable cavity through the through hole; in the invention, the distance L between the adjusting screw and the thin-wall shell can be a certain specific value or can be linearly changed in a proper range according to requirements.

When the transducer is fixed by the potting adhesive, no gap exists between the transducer and the joint surface of the thin-wall shell.

The thin-wall shell is made of stainless steel and is corrosion-resistant, wherein the wall thickness of the joint surface of the thin-wall shell and the transducer is 0.5-1.0mm, and the ultrasonic oscillation starting frequency of the transducer can be guaranteed.

The transition fillet of adjusting screw terminal surface is not more than R0.5mm, perhaps the chamfer of adjusting screw terminal surface is not more than C0.5mm, can guarantee the ultrasonic wave of transducer and reflect comprehensively, reduces the loss, returns reflection frequency and reaches more than 98%.

The steel ball withstands in the recess through the spring, spacing and location simultaneously, can discern pivoted distance and the length of adjusting through feeling and the click sound during rotatory moreover to the realization urea solution's flight time is adjustable.

The number of the grooves is three, the two sides of the grooves are in smooth transition with the inner wall of the adjustable cavity shell, and the grooves are evenly distributed on the inner wall of the adjustable cavity shell, so that the counting and adjusting are convenient.

The thread pitch of 1.5mm is selected for the screw thread, in order to realize trisection with the screw pitch, the distance of 0.5mm of rotation can be known every time the screw thread is rotated to the groove, so that the counting can be realized through the reference, the adjustment of 1.5mm can be realized through three times of hand feeling and clicking sound during rotation, and the multiple relation is realized for six times.

One or more radial seal grooves for mounting a sealing rubber O-ring.

The adjustable cavity shell is provided with an anti-rotation structure, so that the adjustable cavity is prevented from rotating after installation and fixation.

Drawings

FIG. 1 is a front view of an embodiment of the present invention;

FIG. 2 is a top full sectional view of an embodiment of the present invention;

FIG. 3 is a right side view of an embodiment of the present invention;

FIG. 4 is a left side view of an embodiment of the present invention;

FIG. 5 is a right side full section view of an embodiment of the present invention;

fig. 6 is a perspective view in an embodiment of the present invention.

Reference numerals:

1-an adjustable cavity; 11-an adjustable cavity housing; 111-a via; 112-internal thread; 113-groove, 114-anti-rotation structure;

12-an adjusting screw; 121-blind hole; 122-steel balls; 123-a spring; 124-sealing groove; 125-rubber O-rings; 126-adjusting the screw end face; 127-transition fillets or chamfers; 13-thin-walled shell;

2-a transducer; 21-pouring sealant;

3-harness (outgoing cable);

4-PG type cable waterproof joint; 41-rubber sealing gasket; 42-a packing head;

5-locknut;

6, mounting a bracket.

Detailed Description

The invention is shown in figures 1-6:

an adjustable urea solution concentration detection device comprises an energy converter 2, wherein the energy converter 2 is fixed in a thin-wall shell 13 through pouring sealant 21, the thin-wall shell 13 and one end of an adjustable cavity shell 11 are integrated through laser welding or sealant gluing, an internal thread 112 is arranged at the other end of the adjustable cavity shell 11, an adjusting screw 12 is screwed in the internal thread 112, the distance L between the end face 126 of the adjusting screw and the outer wall of the thin-wall shell 13 is changed by rotating the adjusting screw 12, so that the adjustable function is realized, and the adjustable flight time of ultrasonic waves of the energy converter 2 in a urea solution in an adjustable cavity 1 is realized;

the circumference of the adjustable cavity shell 11 is provided with a plurality of through holes 111 from outside to inside;

the wiring harness 3 of the transducer 2 is fixed with a PG-type cable watertight connector 4,

the transducer 2 outputs a signal detection through the wiring harness 3 to the analog front end.

The thin-wall shell 13 is made of stainless steel, wherein the wall thickness of the joint face of the thin-wall shell 13 and the transducer 2 is 0.5-1.0 mm.

The transition fillet 127 of the adjusting screw end face 126 is not more than R0.5mm; or the chamfer 127 angle of the adjusting screw end face 126 is not more than c0.5mm.

A blind hole 121 is formed in the circumferential direction of the adjustable screw 12, and a spring 123 and a steel ball 122 are mounted in the blind hole 121; the inner wall of the adjustable cavity shell 11 is provided with a groove 113 along the axis, and the steel ball 122 is pressed against the groove 113 through a spring 123.

The number of the grooves 113 is three, and the two sides of the groove 113 are in smooth transition with the inner wall of the adjustable cavity shell 11.

The thread for connecting the adjusting screw 12 and the adjustable cavity shell 11 adopts a thread pitch of 1.5 mm.

One or more radial seal grooves 124 are provided between the adjusting screw 12 and the adjustable cavity housing 11, and an O-ring 125 is installed.

The adjustable cavity housing is provided with an anti-rotation structure 114.

In the embodiment of the invention, the transducer 2 and the wiring harness (leading-out cable) 3 are welded into a whole by adopting a soldering process, the thread of the threaded connection between the adjusting screw 12 and the adjustable cavity shell 11 is selected to be 1.5mm, both the thread and the thread are right-handed, when the adjusting screw 12 is rotated clockwise or anticlockwise by a wrench, the spring 123 and the steel ball 122 rotate together with the adjusting screw 12, when the adjustable screw 12 rotates 120 degrees clockwise or anticlockwise continuously, the steel ball 122 can be propped against the groove 113 and generate one sound, and the distance L changes by 0.5 mm; when the adjusting screw 12 rotates one turn continuously, the steel ball 122 can abut against the groove 113 three times and generate three times of sound, and the distance L is increased or decreased by 1.5mm, and when the adjusting screw 12 continues to rotate, the number of the increase or decrease of the distance L can be judged through the heard sound times.

In this embodiment, the adjustable screw 12 is provided with two radial seal grooves 124, which form a small clearance fit with the inner wall of the adjustable cavity housing 11, and two rubber O-rings 125 are used for sealing; and the end face 126 near the side of the transducer 2 acts as a reflection echo, with a rounded transition 127 of R0.3.

In the embodiment, the other end of the adjustable cavity shell 11 is fixed with the PG type cable waterproof connector 4 through threaded connection, wherein the rubber gasket 41; the tightening head 42 is a component of the PG-type cable waterproof connector 4, and the adjustable cavity housing 11 has an anti-rotation structure 114 to prevent the adjustable cavity 1 from rotating after installation and fixation.

The mounting bracket 6 may be used to secure the detection device to the components of the sensor.