Mixer testing device

Abstract

The utility model relates to the technical field of automobile exhaust detection, in particular to a mixer testing device which comprises an air inlet pipe, a mixing pipe and a detection mechanism. The mixing pipe is communicated with the output end of the air inlet pipe, a to-be-tested mixer is arranged in the mixing pipe, and a urea solution can be sprayed into the mixing pipe, so that the hot flow air, the urea solution and the mixer are subjected to collision reaction in the mixing pipe; the detection mechanism comprises a detection cylinder and a gas concentration detection part, the detection cylinder is communicated with the output end of the mixing pipe, and the gas concentration detection part is used for obtaining the gas concentration of ammonia gas generated after the collision reaction in the detection cylinder. According to the mixer testing device, the gas concentration of the reacted ammonia gas is detected through the detection mechanism, so that the conversion rate of the mixer to be tested is calculated, and the detection requirement of mixer development is met.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exhaust detection, in particular to a mixer testing device. Background Art

[0002] Automobile exhaust contains a large amount of harmful gases such as nitrogen oxides, which need to be treated by an exhaust gas aftertreatment system and converted into harmless gases to be discharged into the atmosphere. The existing exhaust gas aftertreatment system uses urea solution to spray into the exhaust gas aftertreatment system. The urea solution and the hot air flow of the exhaust gas are mixed under the action of a mixer to produce ammonia. Ammonia and nitrogen oxides in the exhaust gas produce harmless nitrogen and water under the action of a catalyst, and the urea solution will crystallize and decompose on the surface of the mixer during the mixing process. In the development process of the exhaust gas aftertreatment system, the mixer used to promote the mixing and evaporation of urea to generate ammonia is a key component in the aftertreatment system. During the development process, a detection device is needed to test and evaluate the application effect of the mixer.

[0003] In the exhaust gas after-treatment system, since the exhaust gas after-treatment system is a non-standard industrial product with a high degree of professionalism and requires the use of a variety of professional testing instruments, the existing testing devices are unable to detect the conversion rate of the mixer for ammonia.

[0004] Therefore, there is an urgent need for a mixer testing device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a mixer testing device, which can detect the conversion rate of the mixer to ammonia.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A mixer testing device is provided, comprising: an intake pipe, the intake pipe is used to introduce hot air flow; a mixing tube, the mixing tube is connected to the output end of the intake pipe, a mixer to be tested is arranged in the mixing tube, a urea solution can be sprayed into the mixing tube, so that the hot air flow, the urea solution and the mixer collide and react in the mixing tube; a detection mechanism, the detection mechanism comprises a detection cylinder and a gas concentration detection component, the detection cylinder is connected to the output end of the mixing tube, and the gas concentration detection component is used to obtain the gas concentration of ammonia generated after the collision reaction in the detection cylinder.

[0008] As an optional solution of the mixer testing device, the urea solution is a urea solution, the gas concentration detection component is an ammonia analyzer, a sampling tube is provided on the detection cylinder, and the ammonia analyzer is arranged outside the detection cylinder and connected to the sampling tube.

[0009] As an optional solution of the mixer testing device, a plurality of sampling tubes are provided, and the plurality of sampling tubes are arranged on the detection cylinder at intervals along the air flow direction, and each of the sampling tubes is connected to the ammonia analyzer.

[0010] As an optional solution of the mixer testing device, the mixer testing device further includes an air outlet pipe, and the air outlet pipe is connected to the output end of the detection cylinder.

[0011] As an optional solution of the mixer testing device, the mixer testing device further includes a rectifying unit, and the rectifying unit is connected between the intake pipe and the mixing pipe.

[0012] As an optional solution of the mixer testing device, the mixer testing device also includes a laminar flow observation tube, which is connected between the rectification unit and the mixing tube. An indicator line is provided in the laminar flow observation tube, and the flow state of the hot flow air can be judged by the floating state of the indicator line in the laminar flow observation tube.

[0013] As an optional solution of the mixer testing device, the mixer testing device also includes a thermocouple, which is used to detect the temperature of the hot air flow, and the thermocouple is connected to the output end of the outlet pipe; and / or, the thermocouple is connected to the inlet end of the inlet pipe.

[0014] As an optional solution of the mixer testing device, a nozzle is provided on the top of the mixing tube, and the urea solution can be sprayed into the mixing tube through the nozzle.

[0015] As an optional solution of the mixer testing device, an observation unit is provided on the mixing tube, and the injection process of the urea solution during the reaction process can be observed through the observation unit.

[0016] As an optional solution of the mixer testing device, a light source is installed on the mixing tube, and the light source is used to provide lighting for the interior of the mixing tube.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a mixer test device, including an intake pipe, a mixing tube and a detection mechanism, wherein the intake pipe is used to introduce hot air flow; the mixing tube is connected to the output end of the intake pipe, a mixer to be tested is arranged in the mixing tube, urea solution can be sprayed into the mixing tube, so that the hot air flow, urea solution and the mixer collide and react in the mixing tube; the detection mechanism includes a detection tube and a gas concentration detection component, the detection tube is connected to the output end of the mixing tube, and the gas concentration detection component is used to obtain the gas concentration of ammonia generated after the collision reaction in the detection tube. The mixer test device detects the gas concentration of ammonia after the reaction through the detection mechanism, thereby calculating the conversion rate of the mixer to be tested, and meeting the detection requirements of mixer development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a mixer testing device provided by an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a rectifier unit provided in an embodiment of the utility model.

[0021] In the figure:

[0022] 1. Inlet pipe; 2. Mixing pipe; 21. Nozzle; 22. Observation unit; 23. Light source; 3. Detection tube; 31. Sampling tube; 4. Exit pipe; 5. Rectification unit; 51. Grid; 52. Outer tube; 6. Laminar flow observation tube; 7. Thermocouple; 8. Bracket. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] like Figure 1 and Figure 2 As shown, the mixer test device of this embodiment includes an intake pipe 1, a mixing tube 2 and a detection mechanism. The intake pipe 1 is used to introduce hot air flow; the mixing tube 2 is connected to the output end of the intake pipe 1, and a mixer to be tested is arranged in the mixing tube 2. Urea solution can be sprayed into the mixing tube 2, so that the hot air flow, urea solution and the mixer collide and react in the mixing tube 2; the detection mechanism includes a detection tube 3 and a gas concentration detection component. The detection tube 3 is connected to the output end of the mixing tube 2, and the gas concentration detection component is used to obtain the gas concentration of ammonia generated after the collision reaction in the detection tube 3. The mixer test device detects the gas concentration of ammonia after the reaction through the detection mechanism, so that the reaction rate of the mixer of different schemes to be tested can be calculated, the detection requirements of the mixer are met, and a basis for the performance evaluation of the mixer is provided.

[0027] In this embodiment, the hot air flow is a gas generated by electrically heating air, and the heat in the heated gas is used to promote the conversion of urea solution into ammonia under the action of the mixer; in other embodiments, the hot air flow may also be a gas generated by heating air by burning natural gas; in other embodiments, the hot air flow may be other hot air containing nitrogen oxides to simulate exhaust gas.

[0028] Optionally, the gas concentration detection component is an ammonia analyzer, and a sampling tube 31 is provided on the detection tube 3. The ammonia analyzer is arranged outside the detection tube 3 and connected to the sampling tube 31. The urea solution generates ammonia under the mixing action of the mixer, so the ammonia analyzer is used in this embodiment to detect the gas concentration of ammonia after the reaction. In other embodiments, other components can also be used to detect the ammonia concentration, such as a sensor that can obtain the gas concentration and is directly arranged in the detection tube 3. Figure 1As shown, at least part of the sampling tube 31 is located in the inner cavity of the detection tube 3, and the other part extends outside the detection tube 3 and is connected to an ammonia analyzer (not shown in the figure). In the gas flow path, at least part of the gas to be tested is sucked into the ammonia analyzer to detect the concentration of ammonia, and the reaction rate of the mixer is calculated by the concentration of ammonia, which will not be described in detail here. In other embodiments, other methods can also be selected for sampling, which are not specifically limited here.

[0029] Preferably, a plurality of sampling tubes 31 are provided, and the plurality of sampling tubes 31 are arranged at intervals on the detection tube 3 along the airflow direction, and each sampling tube 31 is connected to the ammonia analyzer. The generation of ammonia is a continuous process. Part of the urea solution in the mixing tube 2 evaporates into steam but has not yet decomposed into ammonia, and will continue to decompose after entering the detection tube 3. The longer the steam flows on the flow path, the more complete the evaporation and decomposition. Therefore, the sampling tubes 31 are arranged at intervals along the airflow direction to measure the ammonia concentration at different positions in the detection tube 3, which is beneficial to improve the accuracy of the detection. In this embodiment, the closer to the output end of the detection tube 3, the longer the reaction time, so the higher the concentration of ammonia.

[0030] Preferably, the connection position between the sampling tube 31 and the detection tube 3 needs to be resistant to high temperature, so in this embodiment, the detection tube 3 is a transparent quartz tube. In other embodiments, the detection tube 3 can also be made of a stainless steel tube, which is not specifically limited here.

[0031] Furthermore, the mixer testing device further comprises an air outlet pipe 4 , which is connected to the output end of the detection tube 3 , and is used to discharge the gas after the reaction.

[0032] Furthermore, the mixer testing device also includes a thermocouple 7, which is used to detect the temperature of the hot air flow. In some embodiments, the thermocouple 7 is connected to the output end of the outlet pipe 4; in other embodiments, the thermocouple 7 is connected to the inlet end of the inlet pipe 1; in still other embodiments, there are two thermocouples 7, one connected to the output end of the outlet pipe 4, and the other connected to the inlet end of the inlet pipe 1. In this embodiment, a thermocouple 7 is provided at the inlet end of the inlet pipe 1 and the output end of the outlet pipe 4, respectively, and the two thermocouples 7 can measure the temperature loss of the hot air flow during the reaction process.

[0033] In this embodiment, the mixer test device further includes a rectifying unit 5, which is connected between the air intake pipe 1 and the mixing pipe 2. The rectifying unit 5 can make the turbulent hot air flow of the air intake pipe 1 form a regular laminar flow, thereby preventing the turbulent movement of the gas during the reaction from affecting the reaction result.

[0034] In this embodiment, if Figure 2As shown, the rectifying unit 5 includes a plurality of grilles 51 and an outer tube 52. The plurality of grilles 51 are arranged inside 52. The plurality of grilles 51 are spliced ​​into a honeycomb-shaped guide channel, and the hot air is forced to pass through the honeycomb grilles 51, thereby forming a uniform laminar flow, ensuring that the hot air flowing into the mixing tube 2 is a uniform laminar flow motion.

[0035] Furthermore, the mixer test device also includes a laminar flow observation tube 6, which is connected between the rectifying unit 5 and the mixing tube 2. An indicator line (not shown in the figure) is provided in the laminar flow observation tube 6, and the flow state of the hot air can be judged by the floating state of the indicator line in the laminar flow observation tube 6. If the indicator line does not swing in the laminar flow observation tube 6, or the swing amplitude is not obvious to the naked eye, it can be regarded that the hot air is in laminar motion. If the swing amplitude of the indicator line is large, it means that the hot air is turbulent.

[0036] Preferably, the indicator line includes a plurality of indicator line bodies arranged horizontally and a steel wire arranged vertically, the steel wire is welded to the inner wall of the laminar flow observation tube 6, and a plurality of indicator line bodies are intermittently woven and fixed on the steel wire, and the flow of the hot air can cause the indicator line bodies to swing. The flow state of the hot air can be judged by the swing amplitude of the indicator line bodies.

[0037] Specifically, observation windows (not shown in the figure) are provided on both sides of the laminar flow observation tube 6. The observation windows enable the inspector to observe the flow of the hot air in the laminar flow observation tube 6 with naked eyes.

[0038] In this embodiment, a transparent quartz glass plate is installed on the observation window. On the one hand, it can prevent the gas in the laminar flow observation tube 6 from leaking from the observation window, thereby enhancing the airtightness of the laminar flow observation tube 6; on the other hand, the transparent quartz glass plate has high transparency and better visibility, and the quartz glass plate has a very low thermal expansion coefficient, which can maintain its dimensional stability when the temperature changes.

[0039] Furthermore, a nozzle 21 is provided at the top of the mixing tube 2, and the urea solution can be sprayed toward the mixing tube 2 through the nozzle 21. In this embodiment, a mixer to be detected is provided in the mixing tube 2, and the urea solution is sprayed from the nozzle 21 into the mixing tube 2, and collides with the mixer in the mixing tube 2. The urea solution gradually evaporates and decomposes into ammonia gas with the hot air in the mixing tube 2, and forms crystals on the surface of the mixer. The urea solution will accelerate the evaporation of the solution after interacting with the mixer, and promote the conversion rate of ammonia gas.

[0040] Furthermore, an observation unit 22 is provided on the mixing tube 2, and the injection process of the urea solution and the crystallization process on the mixer surface during the reaction process can be observed through the observation unit 22. Specifically, the observation unit 22 is a high temperature resistant camera, which is located on both sides of the nozzle 21 and is used to observe the injection process of the urea solution. In this embodiment, the injection process of the urea solution from the nozzle 21 into the mixing tube 2 and the crystallization formation process and decomposition process of the urea solution on the mixer surface can be recorded through the high temperature resistant camera.

[0041] Preferably, a light source 23 is provided on the mixing tube 2, and the light source 23 is used to provide lighting for the interior of the mixing tube 2. Figure 1 As shown, two observation units 22 and two light sources 23 are provided, and the two observation units 22 and the two light sources 23 are evenly distributed around the nozzle 21, and the observation units 22 and the light sources 23 are staggered at 90 degrees, so that the observation units 22 can better record the reaction process inside the mixing tube 2. In other embodiments, the light source 23 can also be provided on the side wall of the mixing tube 2 to provide lighting for the inside of the mixing tube 2, which is not specifically limited here.

[0042] In this embodiment, the rectifying units 5, the laminar flow observation tubes 6, the mixing tubes 2, and the detection tubes 3 are connected to each other by flanges, and the connection is stable and airtight.

[0043] Furthermore, the mixer test device of the present embodiment further comprises at least two brackets 8, each bracket 8 is fixed to the ground by bolts, and the air inlet pipe 1, the rectifying unit 5, the laminar flow observation tube 6, the mixing tube 2, the detection tube 3, and the air outlet pipe 4 are sequentially connected and placed on the bracket 8 and supported by the bracket 8. In some embodiments, there are at least two brackets 8, which are supported on the rectifying unit 5 and the detection tube 3 respectively; in the present embodiment, there are three brackets 8, and a support frame is supported at each end of the rectifying unit 5 and the detection tube 3 to improve stability; in other embodiments, a suitable number of brackets 8 can be used according to the use requirements, which is not specifically limited here.

[0044] Preferably, the bracket 8 is H-shaped. The H-shaped bracket 8 can limit the movement of the rectifying unit 5 and the detection tube 3, and the H-shaped bracket 8 is easy to manufacture and has a low cost.

[0045] Preferably, in this embodiment, both the air inlet pipe 1 and the air outlet pipe 4 are of conical structure. Specifically, the air inlet end of the air inlet pipe 1 is a conical tip, so that the hot air can be better diffused after entering the air inlet pipe 1; the air outlet end of the air outlet pipe 4 is a tip, so that the air flow can be better gathered and discharged.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A mixer test device, characterized in that: include: An air intake pipe (1), the air intake pipe (1) being used to introduce hot air; A mixing tube (2), the mixing tube (2) being connected to the output end of the intake tube (1), the mixing tube (2) being provided with a mixer to be tested, the mixing tube (2) being capable of spraying a urea solution into the mixing tube (2), so that the hot air flow, the urea solution and the mixer collide and react in the mixing tube (2); A detection mechanism, the detection mechanism comprising a detection cylinder (3) and a gas concentration detection component, the detection cylinder (3) being connected to the output end of the mixing tube (2), the gas concentration detection component being used to obtain the gas concentration of ammonia generated after the collision reaction in the detection cylinder (3).

2. The mixer testing device according to claim 1, characterized in that: The gas concentration detection component is an ammonia analyzer. A sampling tube (31) is provided on the detection cylinder (3). The ammonia analyzer is arranged outside the detection cylinder (3) and connected to the sampling tube (31).

3. The mixer testing device according to claim 2, characterized in that: A plurality of sampling tubes (31) are provided, and the plurality of sampling tubes (31) are arranged on the detection cylinder (3) at intervals along the airflow direction, and each sampling tube (31) is connected to the ammonia analyzer.

4. The mixer testing device according to claim 1, characterized in that: The mixer testing device further comprises an air outlet pipe (4), wherein the air outlet pipe (4) is connected to the output end of the detection cylinder (3).

5. The mixer testing device according to claim 1, characterized in that: The mixer testing device further comprises a rectifying unit (5), wherein the rectifying unit (5) is connected between the intake pipe (1) and the mixing pipe (2).

6. The mixer testing device according to claim 5, characterized in that: The mixer testing device further comprises a laminar flow observation tube (6), wherein the laminar flow observation tube (6) is connected between the rectifying unit (5) and the mixing tube (2), and an indicator line is provided in the laminar flow observation tube (6). The floating state of the indicator line in the laminar flow observation tube (6) can be used to judge the flow state of the hot air.

7. The mixer testing device according to claim 4, characterized in that: The mixer testing device further comprises a thermocouple (7), wherein the thermocouple (7) is used to detect the temperature of the hot air flow, and the thermocouple (7) is connected to the output end of the air outlet pipe (4); And / or, the thermocouple (7) is connected to the inlet end of the air inlet pipe (1).

8. The mixer testing device according to any one of claims 1 to 7, characterized in that: A nozzle (21) is provided at the top of the mixing tube (2), and the urea solution can be sprayed into the mixing tube (2) through the nozzle (21).

9. The mixer testing device according to claim 8, characterized in that: The mixing tube (2) is provided with an observation unit (22), and the injection process of the urea solution during the reaction process can be observed through the observation unit (22).

10. The mixer testing device according to claim 9, characterized in that: A light source (23) is installed on the mixing tube (2), and the light source (23) is used to provide lighting for the interior of the mixing tube (2).

Images