CN211338804U - Ozone generator based on constant-pressure control - Google Patents
Ozone generator based on constant-pressure control Download PDFInfo
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- CN211338804U CN211338804U CN201921964708.3U CN201921964708U CN211338804U CN 211338804 U CN211338804 U CN 211338804U CN 201921964708 U CN201921964708 U CN 201921964708U CN 211338804 U CN211338804 U CN 211338804U
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Abstract
The utility model relates to an ozone generator based on constant voltage control, including the shell and lie in the intake pipe, air pump, baroceptor and the ozone generator of mutual series connection in the shell, air pump and baroceptor are connected with the constant voltage controller respectively, the air pump intake speed is adjusted according to the signal of gathering the baroceptor measurement to the constant voltage controller; the air inlet pipe is communicated with an air inlet positioned on the outer side of the shell; the air passage of the ozone generator can maintain constant pressure when the external environment changes, thereby maintaining constant ozone concentration. The problem that the change of the external environment pressure influences the ozone concentration is solved, stable ozone concentration is provided for a chemiluminescence detection method, and the detection precision and stability of nitrogen oxides are improved.
Description
Technical Field
The utility model relates to an automobile exhaust monitoring technology field specifically is ozone generator based on constant voltage control.
Background
With the implementation of the national six standards for automobile exhaust emission, the high-precision detection of the components and the content of the automobile exhaust is more important. The method for measuring the concentration of nitrogen oxide in automobile exhaust by a chemiluminescence detection method (CLD) is one of the methods with the highest precision at present, the nitrogen oxide reacts with ozone and is finally converted into electric energy, and the concentration of the nitrogen oxide is measured by the strength of an electric signal; factors influencing the strength of the electric signal include temperature, nitrogen oxide concentration, tail gas flow, ozone concentration and flow.
Experimental research proves that the important factor influencing the ozone concentration is the air pressure flowing into the ozone generator, and the ozone concentration can drift due to small changes of the air inlet pressure of the ozone generator, so that the concentration of ozone can tend to be stable by using a constant-pressure control technology, and the high-precision detection of nitrogen oxides in automobile exhaust is facilitated. The technology belongs to the field of automobile exhaust detection and analysis.
Therefore, how to maintain a stable gas circuit pressure of a testing instrument for a long time to ensure that the same ozone concentration exists below the testing instrument so as to improve the detection accuracy of nitrogen oxides in automobile exhaust becomes a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an ozone generator based on constant voltage control is provided to solve the defect that exists among the prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the ozone generator based on constant-pressure control comprises a shell, and an air inlet pipe, an air pump, an air pressure sensor and an ozone generator which are arranged in the shell and are connected in series, wherein the air pump and the air pressure sensor are respectively connected with a constant-pressure controller, and the constant-pressure controller adjusts the air inlet speed of the air pump according to a signal measured by the acquired air pressure sensor; the air inlet pipe is communicated with an air inlet positioned on the outer side of the shell;
further, an air buffer is arranged between the air pump and the air pressure sensor;
further, the constant voltage controller is provided with an AD acquisition circuit and a PWM output circuit, the AD acquisition circuit is connected with the air pressure sensor, and the PWM output circuit is connected with the air pump;
further, the air pressure sensor is a differential pressure type air pressure sensor;
further, a drying pipe is arranged between the air inlet and the inlet end of the air pump;
further, a solid desiccant is filled between an inlet and an outlet of the drying pipe, and filter screens are arranged between the inlet and the outlet;
the utility model has the advantages that: to the great change that gas circuit pressure variation can arouse ozone concentration, influence nitrogen oxide's detection precision and stability, the utility model provides an ozone generator based on constant voltage control makes the ozone generator gas circuit also can maintain invariable pressure when external environment changes to maintain invariable ozone concentration. The problem that the change of the external environment pressure influences the ozone concentration is solved, stable ozone concentration is provided for a chemiluminescence detection method, and the detection precision and stability of nitrogen oxides are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the reference numerals are explained below:
1. the device comprises an air inlet, 2, a drying pipe, 3, an air pump, 4, an air buffer, 5, an air pressure sensor, 6 and an ozone generator;
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the constant-pressure control-based ozone generator comprises a housing, and an air inlet pipe, an air pump 3, an air pressure sensor 5 and an ozone generator 6 which are arranged in the housing and connected in series with each other, wherein the air pump 3 and the air pressure sensor are respectively connected with a constant-pressure controller, and the constant-pressure controller adjusts the air inlet speed of the air pump according to the acquired signals measured by the air pressure sensor; the air inlet pipe is communicated with an air inlet 1 positioned on the outer side of the shell;
when the constant-pressure control ozone generator is specifically implemented, the constant-pressure control ozone generator comprises an air inlet, an air pump, an air buffer, an air pressure sensor, an ozone generator and a constant-pressure controller for adjusting the speed of the air pump, wherein the controller is used for collecting analog quantity of the air pressure sensor, converting the analog quantity into air path pressure and then comparing the air path pressure with a set value, if the analog quantity is lower than the set value, the pump speed is increased, if the analog quantity is lower than the set value, the pump speed is reduced, and the pump speed is adjusted by PWM.
In a specific embodiment, in order to prevent control errors caused by impact of gas output by the gas pump on the air pressure sensor, an air buffer 4 is arranged between the gas pump 3 and the air pressure sensor, and the pressure entering the ozone generator is calculated by using the differential pressure between the buffer and the air, which is beneficial to improving the anti-interference capability and stability of the system.
Specifically, after the pump speed is adjusted to a certain value, the air pressure value is collected and used as an air pressure reference value, when the collected air pressure value is smaller than the value, the pump speed is increased to accelerate the stability of the air pressure, and when the collected air pressure value is larger than the value, the pump speed is reduced to reduce the air pressure. The purpose of adding the air buffer is that the air pressure entering the ozone generator is stable, and the air buffer can reduce the air pressure change caused by the tiny vibration of the air pump.
In another embodiment, the constant voltage controller is provided with an AD acquisition circuit and a PWM output circuit, the AD acquisition circuit is connected with the air pressure sensor, and the PWM output circuit is connected with the air pump, so that accurate acquisition of the pressure difference and accurate control of the output of the air pump can be realized, thereby realizing accurate control of the pressure;
specifically, the air pressure sensor 5 is a differential pressure type air pressure sensor, the air pressure of the buffer area is measured by utilizing the differential pressure between the measured air and the air, the air pressure change in the environment is small, and the differential pressure type sensor has strong anti-interference capability, so that the measurement accuracy of the air pressure is improved;
a drying pipe 2 is arranged between the air inlet 1 and the inlet end of the air pump 3 to dry the air entering the ozone generator so as to reduce the influence of air humidity on ozone concentration;
solid desiccant is filled between the inlet and the outlet of the drying tube 2, and filter screens are arranged between the inlet and the outlet to prevent dust and desiccant particles from entering the air pump and the ozone generator to cause pollution.
The utility model has the advantages that: the pressure of the gas entering the ozone generator is controlled, and the gas flows into the ozone generator in a constant pressure manner, so that the aim of stabilizing ozone is fulfilled. The air pressure of the air buffer is collected by adopting the differential pressure type air pressure sensor, the speed of the air pump is adjusted according to the air pressure, the aim of constant pressure control is achieved, the stable air path pressure can be maintained by the testing instrument after the testing instrument is placed for a long time so as to ensure that the same ozone concentration is kept, and the detection precision of the nitrogen oxide in the automobile exhaust can be improved.
By utilizing the constant pressure control technology, the gas flowing into the ozone generator can maintain stable pressure, so that the concentration of ozone is stabilized, and the aim of detecting the content of nitrogen oxides in automobile exhaust with high precision in different environments is fulfilled. The air pressure sensor is used for measuring the differential pressure between the air path and the air to calculate the absolute air pressure in the air path, and the pump speed is adjusted according to the collected air pressure, so that the air pressure in the air path is kept stable, and the aim of stabilizing the ozone concentration is fulfilled.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. Ozone generator based on constant voltage control, its characterized in that: the ozone air pump comprises a shell, and an air inlet pipe, an air pump, an air pressure sensor and an ozone generator which are arranged in the shell and are connected in series, wherein the air pump and the air pressure sensor are respectively connected with a constant pressure controller, and the constant pressure controller adjusts the air inlet speed of the air pump according to a signal measured by the acquired air pressure sensor; the air inlet pipe is communicated with an air inlet positioned outside the shell.
2. The constant voltage control based ozone generator according to claim 1, wherein: an air buffer is arranged between the air pump and the air pressure sensor.
3. The constant voltage control based ozone generator according to claim 2, wherein: the constant voltage controller is provided with an AD acquisition circuit and a PWM output circuit, the AD acquisition circuit is connected with the air pressure sensor, and the PWM output circuit is connected with the air pump.
4. The constant voltage control based ozone generator according to claim 3, wherein: the air pressure sensor is a differential pressure type air pressure sensor.
5. The constant pressure control based ozone generator according to any one of claims 1-4, wherein: and a drying pipe is arranged between the air inlet and the inlet end of the air pump.
6. The constant voltage control based ozone generator according to claim 5, wherein: and a solid desiccant is filled between the inlet and the outlet of the drying pipe, and filter screens are arranged between the inlet and the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921964708.3U CN211338804U (en) | 2019-11-14 | 2019-11-14 | Ozone generator based on constant-pressure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921964708.3U CN211338804U (en) | 2019-11-14 | 2019-11-14 | Ozone generator based on constant-pressure control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211338804U true CN211338804U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921964708.3U Active CN211338804U (en) | 2019-11-14 | 2019-11-14 | Ozone generator based on constant-pressure control |
Country Status (1)
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| CN (1) | CN211338804U (en) |
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2019
- 2019-11-14 CN CN201921964708.3U patent/CN211338804U/en active Active
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