CN-224228746-U - Ultrasonic wave urea injection apparatus

CN224228746UCN 224228746 UCN224228746 UCN 224228746UCN-224228746-U

Abstract

The utility model relates to the field of tail gas aftertreatment devices, and particularly discloses an ultrasonic urea spraying device which comprises a shell formed by a cover body and a box body, wherein an inner cavity and a cooling channel are arranged in the box body, a spray pipe is arranged in the inner cavity in a suspended state through a first elastic part and a second elastic part, a transduction device formed by a piezoelectric ceramic ring and an electrode plate is arranged on the spray pipe to enable the spray pipe to oscillate so as to generate ultrasonic waves, thereby crushing and thinning liquid particles, reducing granularity, improving atomization effect, controlling the atomization effect by ultrasonic frequency without being influenced by pressure of inlet liquid, and having wider adaptation range, and when the spray pipe oscillates, crystals in a crushed pipeline can be vibrated, friction heat can be generated at a contact part, and when the external temperature changes, the device can keep stable temperature by changing the liquid flow in the cooling channel, and can relieve the stability of the crystallization and also reduce the temperature and keep the performance.

Inventors

MA NING
LI WENSHU
YANG GUOQING
Cao Huanbiao
WEI HUANHUAN

Assignees

广西弘力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250422

Claims (10)

1. The ultrasonic urea spraying device comprises a shell, wherein an inner cavity is formed in the shell, a liquid inlet channel is formed in the top of the inner cavity, a spray pipe is arranged in the inner cavity, one end of the spray pipe is communicated with the liquid inlet channel, the other end of the spray pipe extends outwards from the bottom of the shell, piezoelectric ceramic rings and electrode plates which are alternately overlapped are sleeved outside the spray pipe, and the ultrasonic urea spraying device is characterized in that: The top and the bottom of inner chamber are equipped with first mounting hole and second mounting hole respectively, first mounting hole with the feed liquor passageway intercommunication, encircle in the outside of second mounting hole is equipped with cooling channel, still be equipped with main water course in the casing, the one end of main water course is equipped with water inlet connection, the other end of main water course is equipped with first water diversion channel and second water diversion channel, be connected with metering valve and steady voltage cabin between first water diversion channel and the feed liquor passageway, the second water diversion channel with cooling channel's one end is connected, cooling channel's the other end is equipped with the backflow joint, the shaft body of spray tube can be in the first mounting hole with in the second mounting hole and can follow the axis slip of spray tube, the spray tube with be equipped with first elastic part and second elastic part between top and the bottom of inner chamber respectively, first elastic part with the second elastic part can make the spray tube produces elastic vibration in axial.
2. The ultrasonic urea injection device according to claim 1, wherein a baffle is fixedly arranged on the spray pipe, a stepped shaft is arranged at the bottom of the baffle, the stepped shaft is sleeved in the second mounting hole in a slidable manner, the second elastic part is of an annular structure and sleeved on the periphery of the stepped shaft, and the second elastic part can be simultaneously abutted against the bottom of the baffle and the bottom of the inner cavity and elastically compressed.
3. The ultrasonic urea injection device according to claim 2, wherein the nozzle is sleeved with a detachable retainer ring, the piezoelectric ceramic ring and the electrode plate are located between the retainer ring and the baffle plate, a lock nut is arranged at the top of the retainer ring and is in threaded connection with the pipe body of the nozzle, one end of the nozzle is sleeved in the first mounting hole in a sliding manner, the first elastic part is of an annular structure and is sleeved on the periphery of one end of the nozzle, and the first elastic part can be simultaneously abutted against the top of the lock nut and the top of the inner cavity and is elastically compressed.
4. The ultrasonic urea injection device according to claim 3, wherein an inward concave limiting groove is formed in the top of the inner cavity, the first mounting hole is formed in the limiting groove, and the periphery of the first elastic portion can be clamped in the limiting groove.
5. The ultrasonic urea injection device of claim 4, wherein the housing is assembled from a cover and a tank, the inner cavity and the cooling channel are provided in the tank, the liquid inlet channel, the main water channel, the first water distribution channel and the second water distribution channel are provided on the cover, and the cover and the tank are assembled by bolts.
6. The ultrasonic urea injection device according to claim 5, wherein a first connecting channel and a second connecting channel are arranged in the box body, the axes of the first connecting channel and the second connecting channel are parallel to the axis of the inner cavity, one end of the first connecting channel is connected with one end of the cooling channel, one end of the second connecting channel is connected with the other end of the cooling channel, a backflow hole is formed in the cover body, one end of the backflow hole is communicated with the other end of the second connecting channel, the backflow joint is arranged at the other end of the backflow hole, and the other end of the first connecting channel is communicated with the second water diversion channel.
7. The ultrasonic urea injection device of claim 6, wherein a boss is arranged at the top of the cover body, the main water channel, the first water diversion channel and the second water diversion channel are all arranged in the boss, a third mounting hole is arranged at the side part of the boss, and the third mounting hole is communicated with the first water diversion channel.
8. The ultrasonic urea injection device according to claim 7, wherein the pressure stabilizing cabin is detachably mounted on the cover body, the bottom of the pressure stabilizing cabin is communicated with one end of the liquid inlet channel, a fourth mounting hole is formed in the side portion of the pressure stabilizing cabin, one end of the metering valve is fixedly connected with the third mounting hole, and the other end of the metering valve is fixedly connected with the fourth mounting hole.
9. The ultrasonic urea injection device of claim 8, wherein a sealing rubber ring is arranged between the other end of the metering valve and the fourth mounting hole.
10. The ultrasonic urea spraying device according to claim 1, wherein a signal connector is arranged at the top of the shell and is electrically connected with the electrode plate, a mounting seat is arranged at the bottom of the shell, a mounting flange is arranged on the periphery of the mounting seat, a through hole is arranged in the mounting seat, the other end of the spray pipe penetrates through the through hole and extends out of the bottom of the mounting seat, and the diameter of the other end of the spray pipe is gradually reduced and provided with a conical nozzle.

Description

Ultrasonic wave urea injection apparatus Technical Field The utility model belongs to the field of tail gas aftertreatment devices, and particularly relates to an ultrasonic urea injection device. Background Based on the change of automobile exhaust emission regulations, the emission regulations in the national 6B and the national 7 stages put more stringent requirements on the limitation of the exhaust NOx emission, and the mode of only engine manufacturing process and system calibration management cannot be satisfied, so that a urea atomization injection system with larger urea supply quantity, better atomization performance and high conversion efficiency is required to be matched with the urea atomization injection system. The atomization granularity of the traditional urea nozzle is generally between 0.85 and 2.8 millimeters, the atomization effect is greatly related to the pressure of the inlet liquid, in theory, the larger the pressure is, the better the atomization effect is, but the pressure rated range of each urea nozzle is smaller, the better atomization effect cannot be obtained in the limited rated value range, the uniformity of atomized particles can be influenced if the pressure is too high or too low, and urea crystals are easy to form in the nozzle to cause blockage under the condition of low temperature or narrower passage, so that the urea nozzle with better atomization effect, wider adaptation range and better crystallization prevention effect is urgently needed to be developed so as to meet the requirements of new national standard emission standards. The patent document with the application number of CN201010122838.X discloses a phased ultrasonic atomizing nozzle which comprises a front cover, a rear cover and a phased high-frequency ultrasonic transducer array, wherein the phased high-frequency ultrasonic transducer array comprises a support piece, a plurality of array elements and a phased excitation device for driving the array elements, a plurality of holes are distributed on the support piece, one array element is arranged in one hole, all array elements are distributed in a grouping equidistant annular array mode, the support piece inlaid with the array elements, the front cover and the rear cover form a sandwich structure, the tip end of the amplitude transformer is a liquid atomizing surface, and liquid to be atomized reaches the surface of the support piece through a central channel. Although the ultrasonic atomization nozzle in the comparison document can effectively improve the atomization effect, if the ultrasonic atomization nozzle is applied to SCR urea injection, the condition that urea is easy to crystallize due to low temperature and narrow passage cannot be avoided, and the ultrasonic atomization nozzle is also not provided with a heat dissipation and flow control device, so that the urea injection amount is unstable and the failure rate is high, and therefore the ultrasonic atomization nozzle cannot be directly used under the working condition of SCR. The foregoing background is only for the purpose of providing an understanding of the inventive concepts and technical aspects of the present utility model and is not necessarily prior art to the present application and is not intended to be used as an aid in the evaluation of the novelty and creativity of the present utility model in the event that no clear evidence indicates that such is already disclosed at the date of filing of the present application. Disclosure of Invention The utility model aims to provide an ultrasonic urea spraying device, so as to overcome the defects of poor atomization effect, narrow adaptation range and easy crystallization and blockage of the existing urea nozzle. The utility model provides an ultrasonic urea spraying device which comprises a shell, wherein an inner cavity is formed in the shell, a liquid inlet channel is formed in the top of the inner cavity, a spray pipe is arranged in the inner cavity, one end of the spray pipe is communicated with the liquid inlet channel, the other end of the spray pipe extends outwards from the bottom of the shell, piezoelectric ceramic rings and electrode plates which are alternately overlapped are sleeved outside the spray pipe, a first mounting hole and a second mounting hole are respectively formed in the top and the bottom of the inner cavity, the first mounting hole is communicated with the liquid inlet channel, a cooling channel is arranged around the outer side of the second mounting hole, a main water channel is further arranged in the shell, a water inlet joint is arranged at one end of the main water channel, a first water distribution channel and a second water distribution channel are arranged at the other end of the main water channel, a metering valve and a pressure stabilizing cabin are connected between the first water distribution channel and the liquid inlet channel, a backflow joint is arranged at the other end of the cooling chan