Portable nitric oxide conversion device

Abstract

A portable nitric oxide conversion device comprises a shell, a photocatalyst nitric oxide converter, nitric oxide detection equipment and pipeline joints and is further provided with a comparison circuit and a prompt circuit, the two pipeline joints are installed at the outer end of one side of the shell, and an air inlet pipe and an exhaust pipe of the photocatalyst nitric oxide converter are connected with the inner side ends of the two pipeline joints respectively. The outer side ends of the two sets of pipeline joints are respectively connected with a gas inlet pipe of tail gas detection equipment and a tail gas exhaust pipe of a vehicle engine; and the photocatalyst nitrogen oxide converter, the nitrogen oxide detection equipment, the comparison circuit and the prompt circuit are arranged in the shell. According to the utility model, the whole equipment is more convenient to store, carry and use; the photocatalyst nitrogen oxide converter can convert NO2 in tail gas into NO1 and output the NO1 to the gas inlet pipe of the automobile tail gas detection equipment, related mechanisms can monitor the performance of the photocatalyst nitrogen oxide converter in real time, an alarm can be given to prompt detection personnel when a gas leakage fault occurs, and the effectiveness of NO2 data detected by the automobile tail gas detection equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary equipment used in automobile exhaust detection equipment, in particular to a portable nitrogen oxide conversion device. 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 detection equipment will be used to analyze the exhaust gas discharged by the vehicle engine, and then determine whether there are harmful substances in the exhaust gas that exceed the emission standards. Existing exhaust gas detection equipment can only detect NO1 (nitrogen monoxide) for nitrogen oxides emitted in the exhaust gas, and NO2 (nitrogen dioxide) in the exhaust gas cannot be detected. Therefore, when the NO2 emissions of the vehicle engine exceed the standard, the detection party cannot understand the specific situation and force the owner to perform corresponding maintenance on the vehicle. After the excessive NO2 is discharged into the atmosphere, there are the following problems. (1) NO2 interacts with other pollutants to form haze and photochemical smog, which seriously affect urban air quality; (2) NO2 reacts with water vapor to produce nitric acid, leading to the formation of acid rain; (3) NO2 can directly damage plant leaves, affect plant growth and development, and cause plant withering and death. At the same time, NO2 can also cause harm to animals. When the NO2 concentration is high, the respiratory and reproductive systems of animals will be affected; (4) NO2 dissolves in water to produce fuming nitric acid, which pollutes surface water and groundwater and increases the toxin content in water bodies that is harmful to fish and other aquatic organisms; (5) NO2 can cause soil acidification, affecting the soil pH and microbial activity, and thus affecting plant growth and development.

[0003] Due to the above reasons, the existing exhaust gas detection equipment is generally equipped with a photocatalyst nitrogen oxide converter to convert the NO2 in the automobile exhaust gas into NO1 before detection to obtain specific NO2 data (the exhaust gas detection equipment first detects the NO1 data in the exhaust gas, and then connects to the photocatalyst nitrogen oxide converter to detect and detect the data of NO2 after conversion. The NO1 data corresponding to the NO2 after detection is subtracted from the NO1 data in the exhaust gas detected for the first time to obtain the specific NO2 data in the exhaust gas). Although the existing photocatalytic nitrogen oxide converter meets the data detection of NO2 in exhaust gas, there is no suitable storage and installation equipment for the photocatalytic nitrogen oxide converter. Due to the high temperature of exhaust gas, the working conditions of the photocatalytic nitrogen oxide converter are relatively harsh. When the photocatalytic nitrogen oxide converter itself leaks due to various reasons (for example, the exhaust pipe and shell are damaged or leaking at the connection due to poor material, thermal expansion and contraction, etc.), the external air will mix with the converted NO1 and then enter the intake pipe of the exhaust gas detection equipment. The ratio of NO1 and air concentration changes, which will have an adverse effect on the correct data detection of the exhaust gas detection equipment (the mixed air will cause the actual detected NO2 to correspond to the converted NO1 data to be lower). In summary, it is very necessary to provide a nitrogen oxide conversion device that can easily install a photocatalytic nitrogen oxide converter, connect the intake pipe of the exhaust gas detection equipment, etc., and can promptly remind the detection personnel when the photocatalytic nitrogen oxide converter leaks. Utility Model Content

[0004] In order to overcome the disadvantages of the photocatalyst nitrogen oxide converter used in conjunction with the existing automobile exhaust detection equipment due to structural limitations as described in the background, the utility model provides a portable nitrogen oxide conversion device that integrates the photocatalyst nitrogen oxide converter and other components, making the overall storage, carrying and use of the equipment more convenient, and can monitor the performance of the photocatalyst nitrogen oxide converter in real time during operation, and can immediately alarm and prompt the detection personnel when a gas leakage occurs, thereby ensuring as much as possible that the NO2 data detected by the automobile exhaust detection equipment is authentic and valid.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A portable nitrogen oxide conversion device comprises a shell, a photocatalyst nitrogen oxide converter, a nitrogen oxide detection device, and a pipe joint, characterized in that it also has a comparison circuit and a prompt circuit; there are at least two sets of pipe joints, the two sets of pipe joints are installed on the outer end of one side of the shell, the photocatalyst nitrogen oxide converter is installed on the inner side of the shell, the intake pipe and exhaust pipe of the photocatalyst nitrogen oxide converter are respectively connected to the inner ends of the two sets of pipe joints, and the outer ends of the two sets of pipe joints are respectively connected to two hoses, one of which is connected to the intake pipe of the automobile exhaust detection device at the other end, and the other end of the other hose is inserted into the exhaust pipe of the vehicle engine exhaust; the nitrogen oxide detection device, the comparison circuit and the prompt circuit are installed on the other side of the shell; the signal output end of the nitrogen oxide detection device is electrically connected to the signal input end of the comparison circuit, and the signal output end of the comparison circuit is electrically connected to the signal input end of the prompt circuit.

[0007] Furthermore, a handle is rotatably mounted on the outside of the shell.

[0008] Furthermore, the comparison circuit includes an electrically connected adjustable resistor and resistor, and an operational amplifier, the positive power supply input terminal of the operational amplifier is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor and the same-direction input terminal of the operational amplifier, one end of the adjustable resistor is connected to one end of the third resistor and the reverse input terminal of the operational amplifier, and the other end of the second resistor is connected to the other end of the third resistor and the negative power supply input terminal of the operational amplifier.

[0009] Furthermore, the prompt circuit includes an electrically connected resistor, a transistor, and a buzzer, one end of the resistor is connected to the base of the transistor, and the collector of the transistor is connected to the positive power input end of the buzzer.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) In the application of the present invention, the photocatalytic nitrogen oxide converter and other components are integrated and installed together, making the overall storage, carrying and use of the device more convenient; (2) When working, the photocatalytic nitrogen oxide converter can convert NO2 in the exhaust gas into NO1 and output it to the intake pipe of the automobile exhaust gas detection equipment. The nitrogen oxide detection equipment, the comparison circuit and the prompt circuit can monitor the performance of the photocatalytic nitrogen oxide converter in real time, and can immediately alarm and prompt the detection personnel when a gas leakage fault occurs, thereby ensuring that the NO2 data detected by the automobile exhaust gas detection equipment is true and valid as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0014] Figure 1 , 2 As shown in, a portable nitrogen oxide conversion device includes a shell 1, a photocatalyst nitrogen oxide converter 2, a power module E1, a nitrogen oxide detection device E2, a pipe joint 3, a power switch S1, and also has a comparison circuit 4 and a prompt circuit 5; the pipe joint 3 has at least two sets, the two sets of pipe joints 3 are distributed up and down on the outer side of the middle part and are respectively welded to the rear end of the shell 1, the photocatalyst nitrogen oxide converter 2 is installed on the left side of the front end of the shell 1, and the intake pipe, exhaust pipe and inner ends of the two sets of pipe joints 3 of the photocatalyst nitrogen oxide converter 2 are respectively connected to the inner side of the two sets of pipe joints 3. The outer ends of the two sets of pipe joints 3 are respectively connected with two hoses (not shown in the figure) with certain strength and high temperature resistance, the other end of a hose at the lower end is connected with the intake pipe of the automobile exhaust detection equipment (not shown in the figure) through insertion, and the other end of a hose at the upper end is connected with a metal pipe (not shown in the figure), and the other end of the metal pipe is inserted into the exhaust pipe of the vehicle engine; the nitrogen oxide detection equipment E2, the power module E1, the voltage switch S1, the comparison circuit 4 and the prompt circuit 5 are installed in the right part of the shell 1.

[0015] Figure 1 , 2As shown in , a "["-shaped handle 101 is rotatably installed on the outer middle part of the left and right side ends of the shell (to facilitate the detection personnel to transfer the overall position of the portable equipment). The comparison circuit includes an adjustable resistor RP1 and resistors R1, R2, and R3 connected by circuit board wiring, and an operational amplifier E3. The positive power input terminal 7 pin of the operational amplifier E3 is connected to one end of the first resistor R2, the other end of the first resistor R2 is connected to one end of the second resistor R3 and the same direction input terminal 3 pin of the operational amplifier E3, one end of the adjustable resistor RP1 is connected to one end of the third resistor R1 and the reverse input terminal 2 pin of the operational amplifier E3, and the other end of the second resistor R3 is connected to the other end of the third resistor R1 and the negative power input terminal 4 pin of the operational amplifier E3. The prompt circuit includes a resistor R4, a transistor Q1, and a buzzer B connected by circuit board wiring. One end of the resistor R4 is connected to the base of the transistor Q1, and the collector of the transistor Q1 is connected to the positive power input terminal of the buzzer B. The power input end of the power module E1 and the power input end of the photocatalyst nitrogen oxide converter 2 are connected in series through the power switch S1 and the two poles of the AC 220V power supply are connected through a wire. The power output end 3 and 4 pins of the power module E1 and the power input end 1 and 2 pins of the nitrogen oxide detection equipment E2, the power input end of the comparison circuit, the power input end of the amplifier E3, the power input end of the prompt circuit, the emitter of the transistor Q1 and the negative power input end of the buzzer B are connected through wires respectively. The signal output end 3 pin of the nitrogen oxide detection equipment E2 and the other end of the adjustable resistor RP1 at the signal input end of the comparison circuit are connected through a wire. The signal output end of the comparison circuit The 6th pin of the amplifier E3 and the other end of the resistor R4 at the signal input end of the prompt circuit are connected through a wire.

[0016] Figure 1 , 2As shown, the utility model integrates the photocatalytic nitrogen oxide converter and other components together, making the overall storage, carrying and use of the equipment more convenient. Before testing, the other end of a hose at the lower end is connected to the intake pipe of the automobile exhaust detection equipment through insertion, and the other end of the metal pipe connected to the other end of a hose at the upper end is inserted into the exhaust pipe of the vehicle engine. After turning on the power switch S1, the power module E1 and the photocatalytic nitrogen oxide converter are powered on and work, and the power module outputs a stable DC 24V power supply that enters the power input end of the nitrogen oxide detection equipment E2, the comparison circuit, and the prompt circuit. After the exhaust gas enters the photocatalyst nitrogen oxide converter 2, the photocatalyst nitrogen oxide converter 2, under the action of its internal mechanism, converts the NO2 in the automobile exhaust gas into NO1 and outputs it to the automobile exhaust gas detection equipment. The automobile exhaust gas detection equipment detects the gas and obtains specific data of NO2 (the exhaust gas detection equipment first detects the NO1 data in the exhaust gas itself, and then connects to the photocatalyst nitrogen oxide converter to detect and detect the data of NO2 after conversion. The NO1 data corresponding to the NO2 after the detection is subtracted from the NO1 data in the exhaust gas detected for the first time to obtain the specific NO2 data in the exhaust gas). In actual operation, when there is no leakage in the photocatalytic nitrogen oxide converter, the high-level signal output from pin 3 of the nitrogen oxide detection device E2 to the other end of the adjustable resistor RP1 is very low. The high level enters the signal voltage of pin 2 of the operational amplifier E3 after being divided by the adjustable resistors RP1 and R1 (for example, 1V. Since there are more or less nitrogen oxides in the air, the pin 3 of the nitrogen oxide detection device E2 will more or less output a certain voltage signal), which is lower than the signal voltage of pin 3 of the operational amplifier E3 after the 24V power supply is divided by the resistors R2 and R3 (for example, 1.1V). The voltage of pin 3 of the operational amplifier E3 is higher than the voltage of pin 2, and the pin 6 of the operational amplifier E3 outputs a high level and the buzzer B does not sound, indicating that there is no leakage in the photocatalytic nitrogen oxide converter. When the photocatalytic NOx converter itself leaks due to various reasons (for example, the exhaust pipe and shell are damaged or the connection parts leak due to poor materials, thermal expansion and contraction, etc.), the high-level signal output by pin 3 of the NOx detection equipment E2 is relatively high. After voltage division by adjustable resistors RP1 and R1, the signal enters the signal voltage of pin 2 of the operational amplifier E3 (for example, 1.2V), which is higher than the 24V power supply and enters the signal voltage of pin 3 of the operational amplifier E3 through voltage division by resistors R2 and R3. Pin 6 of the operational amplifier E3 outputs a low level, which enters the base of the transistor Q1 through voltage reduction and current limiting by resistor R4. The transistor Q1 is turned on and the collector outputs a high level and enters the positive power input terminal of the buzzer B. The buzzer B is energized and sounds to remind the detection personnel, indicating that the photocatalytic NOx converter is leaking. The detection personnel can perform maintenance and repair in time, which ensures that the NO2 data detected by the automobile exhaust detection equipment is true and valid as much as possible. When the exhaust gas detection equipment first detects the NO1 data in the exhaust gas, the detection purpose can be achieved by inserting the air intake pipe of the automobile exhaust gas detection equipment into the exhaust pipe of the vehicle.

[0017] Figure 2 As shown, transistor Q1 is a PNP transistor of model 9012; the resistance values ​​of resistors R1, R2, and R3 are 120Ω, 22.9K, 1.1K, and 4.7K, respectively; buzzer B is a finished active continuous sound buzzer alarm of model FM24V; power module E1 is an AC 220V to DC 24V power block; the resistance value of adjustable resistor RP1 is 470K (adjusted to 2.28K in this embodiment, when it is produced or used, the technician adjusts the resistance value of adjustable resistor RP1 to be relatively small and its partial pressure is small, then the subsequent leakage of nitrogen oxide concentration is relatively small, and the transistor Q1 will be turned on, that is, the nitrogen oxide concentration detection device of the utility model The threshold is set relatively low; when the resistance value of the adjustable resistor RP1 is adjusted to be relatively large, its divided voltage is large, then the transistor Q1 will be turned on only when the concentration of the subsequent leaked nitrogen oxides is relatively large, that is, the nitrogen oxide concentration detection threshold of the utility model is set relatively high); the nitrogen oxide detection equipment E2 is a finished nitrogen oxide detector model SGA-500E / F-NOX, which has two power input terminals and a signal output terminal. When leaked nitrogen oxides are detected, the signal output terminal will output a 0-5V voltage signal; the photocatalyst nitrogen oxide converter 2 is a finished nitrogen oxide converter model YX-NOX100; the model of the operational amplifier E3 is UA741.

[0018] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the utility model.

[0019] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method 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 the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A portable nitrogen oxide conversion device, comprising a housing, a photocatalyst nitrogen oxide converter, a nitrogen oxide detection device, and a pipeline joint, characterized in that: It also has a comparison circuit and a prompt circuit; there are at least two sets of pipe joints, the two sets of pipe joints are installed on the outer end of one side of the shell, the photocatalyst nitrogen oxide converter is installed on the inner end of one side of the shell, the intake pipe and exhaust pipe of the photocatalyst nitrogen oxide converter are respectively connected to the inner ends of the two sets of pipe joints, and the outer ends of the two sets of pipe joints are respectively connected to two hoses, one of which is connected to the intake pipe of the automobile exhaust detection equipment at the other end, and the other end of the other hose is inserted into the exhaust pipe of the vehicle engine exhaust; the nitrogen oxide detection equipment, the comparison circuit and the prompt circuit are installed on the other side of the shell; the signal output end of the nitrogen oxide detection equipment is electrically connected to the signal input end of the comparison circuit, and the signal output end of the comparison circuit is electrically connected to the signal input end of the prompt circuit.

2. A portable nitrogen oxide conversion device according to claim 1, characterized in that: A handle is rotatably mounted on the outside of the housing.

3. A portable nitrogen oxide conversion device according to claim 1, characterized in that: The comparison circuit includes an electrically connected adjustable resistor and resistor, and an operational amplifier. The positive power supply input terminal of the operational amplifier is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor and the same-direction input terminal of the operational amplifier, one end of the adjustable resistor is connected to one end of the third resistor and the reverse input terminal of the operational amplifier, and the other end of the second resistor is connected to the other end of the third resistor and the negative power supply input terminal of the operational amplifier.

4. A portable nitrogen oxide conversion device according to claim 1, characterized in that: The prompt circuit comprises an electrically connected resistor, a triode and a buzzer, one end of the resistor is connected to the base of the triode, and the collector of the triode is connected to the positive power input end of the buzzer.

Images