阅读说明：本技术 一种优化的尿素溶液浓度检测装置 (Urea solution concentration detection device who optimizes ) 是由 王愉琴 石九玉 周轩 刘庭杰 于 2019-09-27 设计创作，主要内容包括：本发明的公开了一种优化的尿素溶液浓度检测装置,塑料底座的竖直侧向外延伸形成型腔,型腔外壁通过螺纹连接有迫紧螺母。型腔内底部装有换能器分总成,预先将换能器分总成装配完成后再装入塑料底座的型腔底部,相对散件直接组装,提高装配效率。型腔内部设有橡胶密封套,橡胶密封套外还套有塑料胀紧圈。当旋转拧紧迫紧螺母时,塑料胀紧圈和橡胶密封套依次抵住迫紧螺母的内孔底部弧面,塑料胀紧圈受到来自迫紧螺母的双向压紧力；径向压紧力使塑料胀紧圈压紧在橡胶密封套外轴径上,轴向压紧力使塑料胀紧圈压紧在橡胶密封套的台阶处,橡胶密封套的在料胀紧圈和迫紧螺母的双重作用力下产生变形,使橡胶密封套的压紧在线束外径上形成密封。(The invention discloses an optimized urea solution concentration detection device. The transducer subassembly is arranged at the bottom in the cavity, and the transducer subassembly is assembled in advance and then is arranged at the bottom of the cavity of the plastic base, so that the transducer subassembly is directly assembled relative to parts, and the assembly efficiency is improved. The inside of the cavity is provided with a rubber sealing sleeve, and the rubber sealing sleeve is also sleeved with a plastic expansion ring. When the packing nut is screwed down in a rotating mode, the plastic expansion ring and the rubber sealing sleeve sequentially abut against the cambered surface of the bottom of the inner hole of the packing nut, and the plastic expansion ring is subjected to bidirectional pressing force from the packing nut; the radial pressing force enables the plastic expansion ring to be tightly pressed on the outer shaft diameter of the rubber sealing sleeve, the axial pressing force enables the plastic expansion ring to be tightly pressed on a step of the rubber sealing sleeve, and the rubber sealing sleeve deforms under the double acting force of the material expansion ring and the packing nut, so that the rubber sealing sleeve is tightly pressed on the outer diameter of the wire harness to form sealing.)

1. An optimized urea solution concentration detection device comprises a plastic base (1), wherein a cavity (11) extends outwards from the vertical side of the plastic base, a transducer sub-assembly (2) is arranged at the bottom in the cavity, the transducer sub-assembly (2) comprises a thin-wall shell (21), a transducer (22) is fixed in the thin-wall shell (21) through a pouring sealant (24), and the outside of the thin-wall shell (21) is attached to the bottom of the cavity; the transducer subassembly (2) further comprises a wiring harness (23), and the transducer (22) outputs signals outwards through the wiring harness (23); a reflecting support (3) is arranged on the transverse side of the plastic base (1), the transducer (22) forms an emitting surface (221) towards the inner side through the thin-wall shell (21), the emitting surface (221) is arranged opposite to the reflecting surface (31) of the reflecting support (3), and the area of the emitting surface (221) is smaller than that of the reflecting surface (31); the method is characterized in that: the outer shaft diameter of the cavity (11) is provided with threads, and is connected with a packing nut (4) through the threads;

a rubber sealing sleeve (5) is arranged in the cavity (11), and a wiring harness (23) of the transducer subassembly (2) penetrates through the inner hole of the cavity; the A end of the rubber sealing sleeve (5) props against the transducer subassembly (2) through a flat gasket (6);

the step (51) is arranged on the excircle shaft diameter of the end A of the rubber sealing sleeve (5), the plastic expansion ring (7) is further sleeved outside the rubber sealing sleeve (5), the end C of the plastic expansion ring (7) supports against the step (51), and the end D of the plastic expansion ring (7) and the end B of the rubber sealing sleeve (5) sequentially support against the inner hole bottom cambered surface of the packing nut (4).

2. The optimized urea solution concentration detection device according to claim 1, wherein: the D end of the plastic expansion ring (7) is axially provided with notches (72) and claw gathers (71), the notches (72) and the claw gathers (71) are uniformly distributed in the circumferential direction in an alternating manner, and the inner wall of the claw gathers (71) is provided with protrusions (73); a groove (52) is arranged on the outer shaft diameter of the end B of the rubber sealing sleeve (5), and a protrusion (73) on the inner wall of the claw poly (71) is abutted in the groove (52).

3. The optimized urea solution concentration detection device according to claim 1, wherein: and a sealing groove (12) is arranged on the outer end face of the vertical side of the plastic base (1) and is provided with a rubber sealing ring (8).

4. The optimized urea solution concentration detection device according to claim 1, wherein: compel tight nut (4) screw thread terminal surface department be equipped with barb (41), compel tight nut (4) downthehole bottom circular arc terminal surface department also to be equipped with barb (42).

5. The optimized urea solution concentration detection device according to claim 1, wherein: the reflection bracket (3) isIs shaped like a plastic base (1)The shape of the U-shaped frame is that the U-shaped frame and the U-shaped frame are corresponding left and right and are overlapped up and down to form a U-shaped frame structure;

the corner of the plastic base (1) is provided with an insertion hole (13), and the transverse surface of the plastic base (1) is also provided with a convex column (14);

the transverse end part of the reflection bracket (3) is provided with a plug (32) which forms a positioning fit relation with the jack (13).

6. The optimized urea solution concentration detection device according to claim 1 or 4, wherein: through holes (33) are formed in two sides of the reflection bracket (3), and the through holes (33) and the convex columns (14) of the plastic base (1) form a matching relationship of auxiliary positioning;

the convex column (14) fixes the reflecting bracket (3) in a hot melting mode.

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 an optimized urea solution concentration detection device for detecting the concentration of a urea solution.

Background

Urea solution concentration sensor among six diesel vehicle tail gas treatment SCR urea solution injection system for detect the concentration of urea solution, and then provide quantitative urea solution to SCR urea solution injection system as required, consequently detect the detection device of urea solution concentration and be indispensable.

The existing urea solution concentration sensor adopts standard parts such as screws and nuts to fix all appearance parts, the appearance parts have the defect of large volume, and once the screws are loosened, the sealing between a plastic base and a protective support can also lose efficacy.

Disclosure of Invention

Aiming at the defects and risks existing in the prior art background, the invention provides an optimized urea solution concentration detection device, which reduces the volume of an appearance part and increases an anti-loose structure.

Therefore, the technical scheme of the invention is as follows: an optimized urea solution concentration detection device comprises a plastic base, wherein a cavity is formed in the plastic base in a manner that the vertical side of the plastic base extends outwards, a transducer subassembly is arranged at the bottom in the cavity and comprises a thin-wall shell, a transducer is fixed in the thin-wall shell through pouring sealant, and the outer side of the thin-wall shell is attached to the bottom of the cavity; the transducer subassembly also comprises a wiring harness, and the transducer outputs signals outwards through the wiring harness; a reflecting support is arranged on the transverse side of the plastic base, the transducer forms an emitting surface towards the inner side through a thin-wall shell, the emitting surface is arranged opposite to the reflecting surface of the reflecting support, and the area of the emitting surface is smaller than that of the reflecting surface; the method is characterized in that: the outer shaft diameter of the cavity is provided with threads, and is connected with a packing nut through the threads;

a rubber sealing sleeve is arranged in the cavity, and a wire harness of the transducer sub-assembly penetrates through an inner hole of the cavity; the A end of the rubber sealing sleeve props against the transducer subassembly through a flat gasket;

the outer circle shaft diameter of the end A of the rubber sealing sleeve is provided with a step, the rubber sealing sleeve is further sleeved with a plastic expansion ring, the end C of the plastic expansion ring supports against the step, and the end D of the plastic expansion ring and the end B of the rubber sealing sleeve sequentially support against the inner hole bottom cambered surface of the packing nut.

The further improvement lies in that: the D end of the plastic expansion ring is axially provided with notches and claw gathers, the notches and the claw gathers are uniformly distributed in the circumferential direction alternately, and the inner wall of the claw gathers is provided with a bulge; the outer shaft diameter of the end B of the rubber sealing sleeve is provided with a groove, and the protrusion on the claw gathering inner wall is abutted to the groove.

The further improvement lies in that: the outer end face of the vertical side of the plastic base is provided with a sealing groove and a rubber sealing ring.

The further improvement lies in that: the screw end face of the packing nut is provided with an agnail, and the arc end face of the bottom in the hole of the packing nut is also provided with an agnail.

The further improvement lies in that: the reflecting bracket isShaped like a plastic baseThe two are opposite from each other in the left-right direction and are overlapped up and down to form a U-shaped frame structure;

the corner of the plastic base is provided with an insertion hole, and the transverse surface of the plastic base is also provided with a convex column;

the transverse end part of the reflection bracket is provided with a plug which forms a positioning fit relation with the jack.

The further improvement lies in that: through holes are arranged on two sides of the reflecting bracket, and the through holes and the convex columns of the plastic base form a matching relationship for auxiliary positioning;

the convex column fixes the reflecting bracket in a hot melting mode.

Has the advantages that:

according to the optimized urea solution concentration detection device, the plastic base is provided with the cavity extending outwards from the vertical side, the outer shaft diameter of the cavity is provided with the threads, and the threads are connected with the clamping nut, so that the plastic base is connected through the threads of the plastic base, and the size of the plastic base can be properly reduced.

The transducer subassembly is equipped with to the bottom in the die cavity, can assemble the die cavity bottom of accomplishing back repacking plastic base with the transducer subassembly in advance during the assembly like this, relative spare part direct assembly, the assembly beat is more reasonable, improves assembly efficiency.

The transducer is fixed at the inner bottom of the thin-wall shell of the transducer subassembly through pouring sealant, the outer side of the thin-wall shell is attached to the bottom of the cavity, the transducer forms an emitting surface towards the inner side through the thin-wall shell, the emitting surface is arranged opposite to the reflecting surface of the reflecting support, and the area of the emitting surface is smaller than that of the reflecting surface. This is to allow the ultrasonic waves emitted from the transducer to be successfully transmitted and received back signals between the transducer and the reflective support and to minimize ultrasonic losses.

A rubber sealing sleeve is arranged in the cavity, and a wire harness of the transducer sub-assembly penetrates through an inner hole of the cavity; thus, the wire harness can be fixedly protected; the A end of the rubber sealing sleeve props against the transducer sub-assembly through a flat gasket, so that the rubber sealing sleeve and the transducer sub-assembly are reliably positioned and sealed.

The step is arranged on the excircle shaft diameter of the end A of the rubber sealing sleeve, the plastic expansion ring is sleeved outside the rubber sealing sleeve, the end C of the plastic expansion ring props against the step, and the end D of the plastic expansion ring and the end B of the rubber sealing sleeve prop against the cambered surface at the bottom of the inner hole of the packing nut in sequence, so that the rubber sealing sleeve and the plastic expansion ring are reliably fixed in the cavity of the plastic base.

When the nut is compeled to rotatory tightening, the D end of the tight circle that expands of plastics and the B end of rubber seal cover support in proper order and compel the hole bottom cambered surface of tight nut, when compeling tight nut along with continuing rotatory tightening, the tight circle that expands of plastics receives the two-way packing force that comes from compeling tight nut: the radial pressing force enables the protrusion of the D-end claw to be tightly pressed in the groove of the B-end of the rubber sealing sleeve, the axial pressing force enables the C-end of the plastic expansion ring to be tightly pressed at the step of the A-end of the rubber sealing sleeve, the claw of the D-end is gathered, contracted and deformed, the contracted and deformed deformation generates force to be transmitted to the groove of the B-end of the rubber sealing sleeve, meanwhile, the A-end of the rubber sleeve is tightly pressed on the flat gasket, and the B-end of the rubber sealing sleeve is deformed under the double acting force, so that the B-end of the rubber sealing sleeve is tightly pressed on the outer shaft diameter of.

The outer terminal surface of the vertical side of the plastic base is provided with a sealing groove and a rubber sealing ring, so that the urea solution is prevented from permeating into the cavity from the outer terminal surface of the vertical side of the plastic base along the outer axial thread of the cavity in order to seal.

Compel tight nut screw thread terminal surface department be equipped with the barb, compel tight nut hole bottom circular arc terminal surface department also to be equipped with the barb, the purpose is in order to prevent to become flexible the sealed inefficacy that arouses.

The U-shaped frame structure has simple structure and urea solution filled into the U-shaped frame structure.

The plug of the reflection bracket and the jack of the plastic base form a positioning fit relation, so that effective positioning can be carried out.

The cooperation relation of the assistance-localization real-time that the through-hole of reflection support and the projection of plastic base formed makes the location more reliable and difficult inefficacy, makes the interval size L stability and the uniformity of the emitting surface of transducer and the plane of reflection support better.

Through the fixed reflection support of projection hot melt, reduced and connected the fastener, only need the hot melt to press and can accomplish the assembly.

Drawings

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

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

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

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

FIG. 5 is a full sectional view A-A of an embodiment of the present invention;

FIG. 6 is a full sectional view B-B of an embodiment of the present invention;

FIG. 7 is a front view of the packing nut 4 in the embodiment of the present invention;

FIG. 8 is a left side view of the packing nut 4 in the embodiment of the present invention;

FIG. 9 is a top plan full sectional view C-C of the packing nut 4 in the embodiment of the present invention;

FIG. 10 is a shaft side view of the packing nut 4 in the embodiment of the invention;

FIG. 11 is a front view of the plastic expander ring 7 in an embodiment of the invention;

FIG. 12 is a right side cross-sectional view D-D of the plastic expander ring 7 in an embodiment of the invention;

fig. 13 is a right side view of the plastic expander ring 7 in an embodiment of the invention;

fig. 14 is an axial view of the plastic expander 7 in an embodiment of the invention.

Reference numerals:

1-a plastic base; 11-a cavity; 12-a seal groove; 13-jack, 14-boss;

2-a transducer subassembly; 21-thin-walled shell; 22-a transducer; 23-harness (outgoing cable); 24-pouring sealant; 221-an emission surface;

3-a reflective support; 31-a reflective surface; 32-a plug; 33-a via hole;

4, tightening the nut; 41-barbs; 42-barbs;

5-rubber sealing sleeve; 51-step; 52-groove

6-flat washer;

7-plastic expansion ring; 71-claw polymerization; 72-a gap; 73-bumps;

8-rubber sealing ring.

Detailed Description

The utility model is optimized as shown in figures 1-14:

an optimized urea solution concentration detection device comprises a plastic base 1, wherein a cavity 11 extends outwards from the vertical side of the plastic base, a transducer subassembly 2 is arranged at the bottom in the cavity, the transducer subassembly 2 comprises a thin-wall shell 21, a transducer 22 is fixed in the thin-wall shell 21 through a pouring sealant 24, and the outside of the thin-wall shell 21 is attached to the bottom of the cavity; the transducer subassembly 2 further includes a wiring harness 23, and the transducer 22 outputs a signal to the outside through the wiring harness 23. The transverse side of the plastic base 1 is provided with a reflecting bracket 3, the transducer 22 forms an emitting surface 221 inwards through the thin-wall shell 21, the emitting surface 221 is arranged opposite to the reflecting surface 31 of the reflecting bracket 3, and the area of the emitting surface 221 is smaller than that of the reflecting surface 31; the method is characterized in that: the outer shaft diameter of the cavity 11 is provided with threads, and is connected with a packing nut 4 through the threads;

a rubber sealing sleeve 5 is arranged in the cavity 11, and a wire harness 23 of the transducer subassembly 2 penetrates through the inner hole of the cavity; the A end of the rubber sealing sleeve 5 props against the transducer subassembly 2 through a flat gasket 6;

the step 51 is arranged on the excircle shaft diameter of the end A of the rubber sealing sleeve 5, the plastic expansion ring 7 is further sleeved outside the rubber sealing sleeve 5, the end C of the plastic expansion ring 7 abuts against the step 51, and the end D of the plastic expansion ring 7 and the end B of the rubber sealing sleeve 5 sequentially abut against the inner hole bottom cambered surface of the packing nut 4.

The D end of the plastic expansion ring 7 is axially provided with notches 72 and claw gathers 71, the notches 72 and the claw gathers 71 are alternately and uniformly distributed in the circumferential direction, and the inner wall of the claw gathers 71 is provided with a bulge 73; the groove 52 is arranged on the outer shaft diameter of the end B of the rubber sealing sleeve 5, and the protrusion 73 on the inner wall of the claw polymer 71 abuts against the groove 52.

And a sealing groove 12 is arranged on the outer end face of the vertical side of the plastic base 1 and is provided with a rubber sealing ring 8.

Compel tight nut 4 screw thread terminal surface department be equipped with barb 41, compel tight nut 4 downthehole bottom circular arc terminal surface department also to be equipped with barb 42.

The reflecting bracket 3 isShaped like a plastic base 1The shape of the U-shaped frame is that the U-shaped frame and the U-shaped frame are corresponding left and right and are overlapped up and down to form a U-shaped frame structure;

the corner of the plastic base 1 is provided with an insertion hole 13, and the transverse surface of the plastic base 1 is also provided with a convex column 14;

the lateral end of the reflection bracket 3 is provided with a plug 32 which is in a positioning fit relationship with the jack 13.

Through holes 33 are arranged on two sides of the reflection bracket 3, and the through holes 33 and the convex columns 14 of the plastic base 1 form a matching relationship of auxiliary positioning;

the convex column 14 fixes the reflecting bracket 3 by a hot melting mode.

In the invention, the screw thread pair for connecting the plastic base 1 and the packing nut 4 is a fine thread, and the thread pitch is 1 mm.

In the invention, the D end of the plastic expansion ring 7 is provided with eight uniformly distributed notches 72 and eight uniformly distributed claw gathers 71, and the inner wall of each claw gather 71 is provided with a bulge 73; a groove 52 is arranged on the outer shaft diameter of the end B of the rubber sealing sleeve 5.

In the invention, the thread end surface of the packing nut 4 is provided with anti-loosening barbs 41 which are uniformly distributed along the circumferential direction, and the arc end surface of the bottom in the hole of the packing nut 4 is also provided with four uniformly distributed anti-loosening barbs 42.

In the invention, a rectangular jack 11 is arranged at the corner of the plastic base 1, a plug 52 is arranged at the transverse end of the reflecting bracket 5, and the rectangular jack 11 and the plug 52 form over-fit; the horizontal upper surface of plastic base 1 still is equipped with four projection 12, and the both sides of reflection support 5 are equipped with four through-holes 53, and four projection 12 and four through-holes 53 form little clearance fit.

In the invention, the distance L between the reflecting surface 51 of the reflecting support 5 and the emitting surface 31 of the transducer 3 is a specific value 40, and the relative setting error is required to be 0.5 mm.

In the present invention, the thin-walled shell 2 is made of stainless steel, wherein the thickness of the wall of the joint between the thin-walled shell 2 and the emitting surface 31 of the transducer 3 is 0.5.