Engine tail gas depressurization and dilution device applied to automobile tail gas detection equipment
By designing engine exhaust gas pressure reduction and dilution devices, and using equipment such as controllable pressure automatic pressure regulators to adjust the exhaust gas pressure and diluted air ratio, the problem that existing exhaust gas detection equipment cannot normally detect high pressure and high concentration exhaust gas, and the stability and accuracy of exhaust gas detection are achieved.
Patent Information
- Application Number
- CN202421355757.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-14
AI Technical Summary
Existing exhaust gas detection equipment cannot detect normally when facing high pressure and high concentration exhaust gas, which may even lead to overvoltage damage to the equipment components and the detection data may be distorted.
An engine exhaust gas pressure reduction and dilution device is designed, including a controlled pressure automatic pressure regulator, temperature detection equipment, pressure detection equipment, mass flow controller, filter, air compressor, orifice flow controller, etc. Through the synergistic effect of these equipment, the exhaust gas pressure and diluted air ratio are adjusted to ensure that the exhaust gas detection equipment can conduct stable and reliable detection.
It effectively reduces the pressure and concentration of the intake end of the exhaust gas detection equipment, prevents excessive exhaust gas pressure from adversely affecting the equipment, avoids the problem of distortion of the detection data, and ensures the accuracy and reliability of the detection results.
Smart Images
Figure CN222896143U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of auxiliary equipment used in automobile exhaust detection equipment, in particular to an engine exhaust pressure reduction and dilution device used in automobile exhaust detection equipment. Background Art
[0002] In the production of automobile engines, in order to ensure the production quality of products, and in the annual inspection of vehicles, in order to ensure that the vehicle's exhaust emissions meet the requirements, exhaust gas testing equipment will be used to analyze the exhaust gas discharged by the vehicle engine, and then determine whether there is excessive emission of harmful substances in the exhaust gas.
[0003] Although the existing exhaust gas detection equipment has met the detection needs to a certain extent, due to structural limitations, its intake end has certain requirements for the input exhaust gas pressure and concentration, and can only detect the exhaust gas discharged at a certain engine speed and load. When the engine speed exceeds a certain level and the exhaust gas pressure is too high, the exhaust gas detection equipment will not be able to perform detection normally, and even the internal components of the exhaust gas detection equipment may be damaged by overpressure due to excessive pressure; when the engine load is too large or the combustion is insufficient, resulting in excessive concentration of exhaust pollutants, exceeding the data analysis range of the exhaust gas detection equipment, the detection data will be distorted. Based on the above, it is particularly necessary to provide a device that can reduce the exhaust gas pressure and concentration to an acceptable range for the exhaust gas detection equipment. Utility Model Content
[0004] In order to overcome the drawback that the existing exhaust gas detection equipment is unable to effectively ensure the detection and analysis of automobile exhaust gas due to the lack of a matching and suitable pressure reduction and exhaust gas dilution equipment, the utility model provides an engine exhaust gas pressure reduction and dilution device used in automobile exhaust gas detection equipment for ensuring the stability and reliability of the exhaust gas detection equipment and the analysis of automobile exhaust data, which can reduce the pressure of the exhaust gas discharged by the vehicle engine entering the intake pipe of the exhaust gas detection equipment and provide air in different proportions for dilution.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] The engine exhaust gas pressure reduction and dilution device used in automobile exhaust gas detection equipment includes a controllable pressure automatic pressure regulator, a temperature detection device, a pressure detection device, a mass flow controller, a filter, an air compressor, an orifice flow controller, an intake pipe, an exhaust pipe, and a ventilation pipe, characterized in that one end of the intake pipe is connected to the intake end of the controllable pressure automatic pressure regulator, the exhaust end of the controllable pressure automatic pressure regulator is connected to one end of the ventilation pipe, the ventilation pipe has a mounting hole, the intake end of the temperature detection device and the pressure detection device and the mounting hole are installed together, the other end of the ventilation pipe is connected in parallel with the intake end of the orifice flow controller and the exhaust end of the mass flow controller, the intake end of the mass flow controller is connected to the exhaust end of the filter, the intake end of the filter is connected to the exhaust end of the air storage tank of the air compressor, and the exhaust end of the orifice flow controller is connected to one end of the exhaust pipe.
[0007] Furthermore, the other end of the exhaust pipe is connected to the air inlet end of the automobile exhaust detection equipment via a hose.
[0008] Furthermore, a limiting plate is installed on the outer side of the front end of the other end of the air intake pipe.
[0009] Furthermore, the controllable pressure automatic pressure regulator, temperature detection equipment, pressure detection equipment, mass flow controller, filter, air compressor, orifice flow controller, intake pipe, exhaust pipe, and ventilation pipe are installed in the box, and the front end of the intake pipe and the rear end of the exhaust pipe are respectively located outside the front and rear ends of the box.
[0010] Furthermore, the air compressor can also be replaced by a compressed air tank.
[0011] Furthermore, the temperature detection device is a thermocouple temperature display with a liquid crystal display; the pressure detection device is a pressure gauge with a liquid crystal display.
[0012] Furthermore, the orifice flow controller is an orifice laminar flow differential pressure multivariable flow controller.
[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model can adjust the exhaust pressure input into the automobile exhaust detection equipment through the controllable pressure automatic pressure regulator, and can prevent the adverse effect of excessive exhaust pressure on the automobile exhaust detection equipment. The detection personnel can understand the temperature and pressure data of the exhaust in real time through the temperature detection equipment and the pressure detection equipment. The high-compressed air output by the air compressor is filtered by the filter, and the flow rate is controlled by the mass flow controller. The air and exhaust ratio is controlled by the orifice flow controller and then enters the intake pipe of the automobile exhaust detection equipment, providing the automobile exhaust detection equipment with a suitable concentration of air and exhaust mixed gas, and preventing the concentration of exhaust pollutants from being too high, exceeding the data analysis range of the exhaust detection equipment, and causing the problem of distortion of the detection data. Based on the above, the utility model has a good application prospect. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION
[0016] Figure 1 As shown in the figure, the engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment includes a controllable pressure automatic pressure regulator 1, a temperature detection device 2, a pressure detection device 3, a mass flow controller 4, a filter 5, an air compressor 6, an orifice flow controller 7, an intake pipe 8, an exhaust pipe 9, and a ventilation pipe 10. One end of the intake pipe 8 is connected to the intake end of the controllable pressure automatic pressure regulator 1 through a thread, and the exhaust end of the controllable pressure automatic pressure regulator 1 is connected to one end of the ventilation pipe 10 through a thread. The middle upper end of the ventilation pipe 10 has two screws at a distance from the left to the right. Hole, the air inlet end of the temperature detection device 2 and the pressure detection device 3 are connected to the two screw holes via threads respectively, the other end of the ventilation pipe 10 is connected to the first end of a three-way pipe via threads; the second end and the third end of the three-way pipe are connected to the air inlet end of the orifice flow controller 7 and the exhaust end of the mass flow controller 4 via pipelines respectively, the air inlet end of the mass flow controller 4 and the exhaust end of the filter 5 are connected via pipelines, the air inlet end of the filter 5 and the exhaust end of the air tank of the air compressor 6 are connected via pipelines, and the exhaust end of the orifice flow controller 7 and one end of the exhaust pipe 10 are connected via threads.
[0017] Figure 1As shown in , the other end of the exhaust pipe 10 and the air inlet end of the automobile exhaust detection equipment are connected through a high temperature resistant hose. A circular limit plate 81 is welded on the outside of the front end of the other end of the air inlet pipe 8 (to ensure that the exhaust gas discharged from the automobile exhaust pipe enters the air inlet pipe 8 as much as possible), and the outer diameter of the other end of the air inlet pipe 8 is smaller than the inner diameter of the automobile exhaust pipe. The controllable pressure automatic pressure regulator 1, the temperature detection device 2, the pressure detection device 3, the mass flow controller 4, the filter 5, the air compressor 6, the orifice flow controller 7, the air inlet pipe 8, the exhaust pipe 9, and the ventilation pipe 10 are uniformly installed in a box with a movable cover at the upper end (not shown in the figure, the box is convenient for carrying and transferring the overall position of the equipment), and the front end of the air inlet pipe 8 and the rear end of the exhaust pipe 9 are respectively located outside the front and rear ends of the box. The air compressor 6 can also be replaced by a compressed air tank with a gas filling nozzle and an exhaust end. The compressed air tank is filled with compressed air through the gas filling nozzle by an air compressor, etc., and the air inlet end of the filter 5 and the exhaust end of the compressed air tank are connected by a pipeline. The controllable pressure automatic pressure regulator 1 is a DP20 intelligent pressure controller, which can discharge the high-pressure gas input at the inlet end at a constant pressure from the exhaust end according to the pressure value set by itself. The temperature detection device 2 is a thermocouple temperature display with a liquid crystal display of model XP-BZP13; the pressure detection device 3 is a pressure gauge with a liquid crystal display of model YD-100. The filter 5 is a cylindrical air filter; the mass flow controller 4 is a finished mass flow controller of model AST10-DL. The orifice flow controller 7 is a finished orifice laminar differential pressure multivariable flow controller of the American brand KNKE.
[0018] Figure 1As shown, when the present invention is used, the other end of the exhaust pipe 10 and the air intake end of the automobile exhaust gas detection equipment are connected through a high-temperature resistant hose, and the front part of the other end of the air intake pipe 8 is inserted into the automobile exhaust pipe, and the exhaust gas discharged from the exhaust pipe enters the air intake pipe 8. The exhaust pressure input into the automobile exhaust gas detection equipment can be adjusted by the controllable pressure automatic pressure regulator 1 (for example, adjusted to a suitable working pressure of 20kpa for the automobile exhaust gas detection equipment), which can prevent the adverse effects of excessive exhaust gas pressure on the automobile exhaust gas detection equipment. The detection personnel can understand the temperature and pressure data of the exhaust gas in real time through the temperature detection equipment 2 and the pressure detection equipment 3. Combined with the pressure data displayed by the temperature detection equipment 2 (generally, high temperature means high pressure, and vice versa, low pressure) and the pressure detection equipment 3, the staff can accurately adjust the exhaust pressure subsequently input into the automobile exhaust gas detection equipment through the controllable pressure automatic pressure regulator 1. After the pressure is reduced, the exhaust gas enters the air inlet end of the orifice flow controller 7. The compressed air output by the air compressor tank is filtered out of impurities and moisture by the filter 5, and then the flow and pressure are adjusted by the mass flow controller 4 before entering the air inlet end of the orifice flow controller 7. After the ratio of air and exhaust gas is controlled by the orifice flow controller, it enters the air intake pipe of the automobile exhaust detection equipment, providing the automobile exhaust detection equipment with a suitable concentration of air and exhaust mixed gas; for example, the flow output of the orifice flow controller 7 is fixed at 15L / min or 20L / min (in actual application of the orifice flow controller 7, the output The flow rate can be realized by replacing orifice plates with different apertures according to actual needs). When the output flow rate of the orifice flow controller 7 is set to 15L / min, the mass flow controller 4 is used to set the air flow rate to 14L / min. At this time, the engine exhaust gas collection is 1L / min, which provides 15 times of diluted exhaust gas for the exhaust gas collection equipment. The diluted exhaust gas enters the exhaust gas detection equipment for detection. Subsequently, the pollutant concentration value measured by the exhaust gas detection equipment (which simultaneously detects and analyzes the data of various gases in the exhaust gas) is multiplied by 15 to obtain the exhaust gas concentration originally emitted by the engine. Through the above, the new type prevents the concentration of exhaust pollutants from being too high, exceeding the data analysis range of the exhaust gas detection equipment, and causing the problem of distorted detection data.
[0019] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. An engine exhaust gas pressure reduction and dilution device used in automobile exhaust gas detection equipment, including a controllable pressure automatic pressure regulator, a temperature detection device, a pressure detection device, a mass flow controller, a filter, an air compressor, an orifice flow controller, an intake pipe, an exhaust pipe, and a vent pipe, characterized in that: One end of the inlet pipe is connected to the inlet end of the controllable pressure automatic pressure regulator, the exhaust end of the controllable pressure automatic pressure regulator is connected to one end of the ventilation pipe, the ventilation pipe has a mounting hole, the inlet ends of the temperature detection device and the pressure detection device and the mounting hole are installed together, the other end of the ventilation pipe is connected in parallel to the inlet end of the orifice flow controller and the exhaust end of the mass flow controller, the inlet end of the mass flow controller is connected to the exhaust end of the filter, the inlet end of the filter is connected to the exhaust end of the air tank of the air compressor, and the exhaust end of the orifice flow controller is connected to one end of the exhaust pipe.
2. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: The other end of the exhaust pipe is connected to the air inlet end of the automobile exhaust detection equipment via a hose.
3. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: A limit plate is installed on the outer side of the front end of the other end of the intake pipe.
4. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: A controllable pressure automatic pressure regulator, a temperature detection device, a pressure detection device, a mass flow controller, a filter, an air compressor, an orifice flow controller, an air intake pipe, an exhaust pipe, and a ventilation pipe are installed in the box, and the front end of the air intake pipe and the rear end of the exhaust pipe are respectively located outside the front and rear ends of the box.
5. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: The air compressor can also be replaced by a compressed air tank.
6. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: The temperature detection device is a thermocouple temperature display with a liquid crystal display; the pressure detection device is a pressure gauge with a liquid crystal display.
7. The engine exhaust gas pressure reduction and dilution device used in the automobile exhaust gas detection equipment according to claim 1 is characterized in that: The orifice flow controller is an orifice laminar flow differential pressure multivariable flow controller.