CN213364229U - Exhaust gas dilution device and exhaust gas test equipment - Google Patents
Exhaust gas dilution device and exhaust gas test equipment Download PDFInfo
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- CN213364229U CN213364229U CN202022047178.5U CN202022047178U CN213364229U CN 213364229 U CN213364229 U CN 213364229U CN 202022047178 U CN202022047178 U CN 202022047178U CN 213364229 U CN213364229 U CN 213364229U
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Abstract
The utility model discloses an exhaust diluting device, include: a raw exhaust gas introduction line for introducing sampled exhaust gas from the engine; a dilution gas introduction line that meets the original exhaust gas introduction line so as to add a dilution gas to the sampled exhaust gas, a pressure regulating valve (4), a flow control valve (5), a flow meter (6), and an on-off valve (7) being arranged in series in the dilution gas introduction line, wherein an output pressure of the pressure regulating valve (4) is adjustable; the pressure regulating valve (4) is integrated with a heating element for heating the diluent gas flowing through the pressure regulating valve (4). Also disclosed is an exhaust gas testing apparatus comprising the exhaust gas dilution device. The exhaust temperature drop caused by the addition of the diluent gas can be avoided.
Description
Technical Field
The present application relates to an exhaust gas dilution device that dilutes engine exhaust gas in an engine exhaust test and an exhaust test apparatus including such an exhaust gas dilution device.
Background
It is desirable in engine testing to test the concentration of various constituents in the original exhaust of an engine. After a long period of use of the test equipment, the higher concentration of Hydrocarbons (HC) and particles contained in the original exhaust gas may cause contamination of the test equipment or clogging of various components, which may result in inaccurate test results, interruption of the test process, and the like. To reduce clogging or fouling problems of the test equipment, the raw exhaust gas can typically be diluted with a dilution gas. After dilution, the actual concentrations of various components in the original exhaust gas can be obtained by detecting the concentrations of various components in the diluted exhaust gas and converting the concentrations by using the dilution ratio.
The existing exhaust gas dilution device was studied and found to have some problems therein, for example, the addition of the dilution gas causes a drop in the exhaust gas temperature, which causes problems of HC adhesion on the pipe line and the detection element, easy passing of the automatic calibration of the test device beyond the conventional range, reduced test accuracy, and the like.
SUMMERY OF THE UTILITY MODEL
It is an object of the present application to provide an improved exhaust gas testing device and an exhaust gas dilution apparatus thereof, which can avoid the problem caused by the drop of the exhaust gas temperature due to the addition of dilution gas in the engine exhaust gas test, while reducing the device failure rate.
To this end, the present application provides, in one aspect thereof, an exhaust gas dilution device comprising:
a raw exhaust gas introduction line for introducing sampled exhaust gas from the engine;
a dilution gas introduction line that merges with the original exhaust gas introduction line so as to add a dilution gas to the sampled exhaust gas, the dilution gas introduction line having a pressure regulating valve, a flow control valve, a flow meter, and an on-off valve arranged therein in series, wherein an output pressure of the pressure regulating valve is adjustable;
the pressure regulating valve is integrated with a heating element and used for heating the diluent gas flowing through the pressure regulating valve.
In one embodiment, the heating element is an electric hot plate attached to the base of the pressure regulating valve.
In one embodiment, the heating power of the heating element is adjustable based on one or more of a diluent gas temperature before flowing into the pressure regulating valve, a diluent gas temperature after flowing through the pressure regulating valve, a diluent gas flow rate, a sampled exhaust gas temperature, a sampled exhaust gas flow rate.
In one embodiment, the flow rate of the flow control valve is adjustable, the flow rate of the flow control valve being adjusted based on the sampled exhaust gas flow rate and the dilution ratio of the dilution gas to the sampled exhaust gas.
In one embodiment, the flow control valve is a needle valve.
In one embodiment, the exhaust gas dilution device further includes: a gas filter for filtering diluted engine exhaust gas, the gas filter being equipped with a heating element.
In one embodiment, the exhaust gas dilution device further includes a filter case surrounding the body portion of the gas filter, and the heating element of the gas filter is a heating wire provided in the filter case for heating the body portion of the gas filter.
In one embodiment, the pressure regulating valve, flow control valve, flow meter, and on-off valve are integrated together by a common diluting assembly housing to form an integrated diluting assembly.
In one embodiment, the dilution assembly housing and the filter housing are supported by a common support in a vertically adjustable manner.
The present application provides, in another aspect thereof, an exhaust gas testing apparatus including:
the exhaust gas dilution device as described above; and
and the exhaust gas analyzer is connected with the exhaust gas diluting device and used for receiving the diluted engine exhaust gas supplied by the exhaust gas diluting device and analyzing the content of the target component in the engine exhaust gas.
In one embodiment, the exhaust gas testing apparatus further comprises a controller coupled to the exhaust gas analyzer and the exhaust gas dilution device and configured to determine a dilution ratio of dilution gas to sampled exhaust gas and to close-loop adjust a flow of the flow control valve in the exhaust gas dilution device according to the determined dilution ratio and sampled exhaust gas flow.
According to the application, the pressure regulating valve with the heating function is adopted in the exhaust gas dilution device to prevent the temperature of the diluted exhaust gas from being reduced, so that high adhesion of HC due to sudden temperature drop can be avoided, the automatic calibration of the test equipment is ensured not to exceed the conventional range easily, and higher test precision can be obtained.
Drawings
The foregoing and other aspects of the present application will be more fully understood and appreciated by reference to the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration of an engine exhaust testing apparatus according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a pressure regulating valve with a heating function in an exhaust gas testing apparatus according to the present application;
fig. 3, 4 are front and right side views, respectively, of one possible configuration of an exhaust testing apparatus according to the present application.
Detailed Description
The present application relates generally to an engine exhaust gas testing apparatus for detecting the content of various components in exhaust gas of an engine, and an exhaust gas diluting device used in the exhaust gas testing apparatus for diluting exhaust gas.
As shown in fig. 1, the engine exhaust gas testing apparatus of the present application includes: an exhaust gas analyzer 1, and an exhaust gas dilution device for supplying diluted engine exhaust gas to the exhaust gas analyzer 1.
The exhaust gas dilution device includes: a raw exhaust gas introduction line L1 for introducing raw exhaust gas (which may be referred to as sampled exhaust gas) of the engine through a gas sampling pump (not shown); a dilution gas introduction line L2 having an upstream end connected to a dilution gas source (not shown) and a downstream end meeting the original exhaust gas introduction line L1 for introducing dilution gas supplied from the dilution gas source into the original exhaust gas; a diluted exhaust line L3 having a starting end connected to a junction of the original exhaust introduction line L1 and the diluted gas introduction line L2 and a terminal end connected to the exhaust analyzer 1; a gas filter 2 having a heating function disposed in the post-dilution exhaust line L3; and a dilution assembly 3 disposed in the dilution gas introduction line L2.
The exhaust gas analyzer 1 may employ a commercially available analyzer such as a Horiba analyzer or the like.
The gas cleaner 2 is equipped with a filter case 10, and a heating wire (not shown) for heating a filter element portion of the gas cleaner 2 is provided in the filter case 10, thereby achieving a heating function of the gas cleaner 2. Other heating elements that can be used for heating the gas filter 2 can also be used here.
A pumping device (not shown) such as an air pump may be disposed in the dilution gas introduction line L2 to suck the dilution gas from the dilution gas source. The diluent gas may be air, nitrogen, or the like.
In a possible embodiment, the dilution assembly 3 comprises a pressure regulating valve 4 with heating function, a flow control valve 5, a flow meter 6, an on-off valve 7, arranged in series along the dilution gas path. The pressure regulating valve 4, flow control valve 5, flow meter 6, on-off valve 7 may be integrated together using a common housing or support to form an integrated dilution unit 3. The dilution assembly 3 may be connected to a dilution gas introduction line L2 through an input port 8 and an output port 9.
The pressure regulating valve 4, which may be called a pressure regulator, reduces the pressure of the gas by regulating the flow rate of the gas using the opening degree of an opening/closing element in the valve body. Meanwhile, the opening degree of the opening and closing member is adjusted by the action of the post-valve pressure, so that the post-valve pressure is kept within a predetermined range. The outlet pressure is maintained at approximately the temperature with the inlet pressure varying.
The heating function of the pressure regulating valve 4 may be realized by an electric heating element provided for the pressure regulating valve 4. For example, according to a possible example shown in fig. 2, the seat of the pressure regulating valve 4 is equipped with an electric heating plate 4a (which includes a heating sheet and is heated electrically) for heating the valve body of the pressure regulating valve 4. Alternatively, the electric heating plate 4a may also include electric heating elements such as heating wires, electric heating films, electric heating paste, and the like.
According to other possibilities, heating wires may be arranged around the gas inlet and/or outlet of the pressure regulating valve 4 and/or inside the inner wall of the housing or the housing material of the pressure regulating valve 4. Other heating elements that can be used in the pressure regulating valve 4 can also be used here.
The output pressure of the pressure regulating valve 4 is adjustable. The operator can set the output pressure of the pressure regulating valve 4 by means of a mechanical knob or an electronic adjustment interface.
The pressure regulating valve 4 having the heating function may employ a commercially available pressure regulating valve such as a Hemmi pressure regulating valve.
The flow control valve 5 may control the flow rate of the diluent gas in the diluent gas introduction line L2. The flow control valve 5 may be a needle valve or the like. The flow control valve 5 may also be adjustable (e.g. by adjusting the opening of the flow control valve 5), thereby enabling adjustment of the flow of dilution gas through the flow control valve 5.
The flow meter 6 is used to measure the flow rate of the dilution gas in the dilution gas introduction line L2.
The on-off valve 7 is used to control the on-off of the entire dilution gas introduction line L2.
The flow control valve 5, the flow meter 6 and the on-off valve 7 may be commercially available products.
The order of the pressure regulating valve 4, the flow control valve 5, the flow meter 6, and the on-off valve 7 is not limited to that shown in the figure, but the order of their distribution may be set as the case may be.
By adopting the pressure regulating valve 4 with the heating function in the dilution unit 3 of the present application, the dilution gas can be heated in addition to the output pressure of the dilution gas, so as to prevent the condensation of moisture in the dilution gas and the adhesion of HC to the pipeline, and prevent the temperature of the engine sampled exhaust gas (which usually has a high temperature) from being reduced too much after being mixed with the dilution gas, thereby affecting the test accuracy.
In this connection, it is to be noted that the heating power of the heating element in the pressure regulating valve 4 may be set so that the temperature of the diluent gas after flowing through the pressure regulating valve 4 corresponds to the temperature of the sampled exhaust gas. The heating power of the heating element in the pressure regulating valve 4 may be set in dependence of the temperature of the diluent gas upstream and/or downstream of the pressure regulating valve 4, the flow of diluent gas being controlled by the flow control valve 5. According to one possible embodiment, a temperature sensor (not shown) may be added upstream and/or downstream of the pressure regulating valve 4 to measure the temperature of the diluent gas before and/or after it has been heated by the pressure regulating valve 4. The dilution assembly 3 may employ closed loop control, i.e. automatically adjusting the heating power of the heating element in the pressure regulating valve 4 based on the measurement of the temperature measuring instrument upstream and/or downstream of the pressure regulating valve 4, and/or the measurement of the flow meter 6.
Further, since the sampled exhaust gas is input into the original exhaust gas introduction line L1 through the air pump, the flow rate of the sampled exhaust gas is substantially constant and adjustable. By employing the flow control valve 5 in the dilution unit 3, the flow rate of the dilution gas introduced into the sampled exhaust gas can be made to match the flow rate of the sampled exhaust gas so as to maintain a desired dilution ratio and a diluted exhaust gas flow rate, so that the diluted exhaust gas is supplied to the exhaust gas analyzer 1 through the diluted exhaust gas line L3 at a predetermined dilution ratio and flow rate.
The dilution ratio may be determined by an exemplary dilution ratio determination process described below.
First, the diluent gas introduction line L2 is closed by the on-off valve 7; operation of the exhaust gas analyzer 1 is initiated to detect a certain target component (e.g., O) in the sampled exhaust gas2) Is the concentration of the target component in the undiluted raw exhaust gas.
Next, the on-off valve 7 is opened so that the diluent gas is introduced through the diluent gas introduction line L2; the exhaust gas analyzer 1 detects the concentration of the target component in the diluted sample exhaust gas, that is, the diluted target component concentration.
Next, the target component concentration in the original exhaust gas is compared with the diluted target component concentration, and the dilution ratio can be determined.
In the presence of oxygen not containing the target component, e.g. O2The gas (e.g. nitrogen) being a diluent gasIn the case of the body, the dilution ratio can be obtained by dividing the target component concentration in the original exhaust gas by the diluted target component concentration. In the presence of a catalyst containing the target component, e.g. O2When the gas (e.g., air) is a diluent gas, the concentration of the target component in the diluent gas is taken into consideration when calculating the dilution ratio.
After the dilution ratio is determined, the dilution ratio may be used to convert the concentrations of the various constituents found in the normal test of the engine exhaust test equipment into the true concentrations of the various constituents in the original exhaust (i.e., the actual exhaust of the engine).
The engine exhaust gas test device of the present application may include a controller that is connected to the exhaust gas analyzer 1 and the exhaust gas test device, and may determine the dilution ratio through a dilution ratio determination process such as that described above, and automatically close-loop adjust the flow rate of the flow control valve 5 according to the determined dilution ratio, the measurement value of the flow meter 6.
The automatic control of the heating power of the heating element in the pressure regulating valve 4 described above can also be realized by this control device.
The various components of the engine exhaust testing apparatus of the present application may be integrated together. For example, one possible configuration of the exhaust gas testing apparatus is shown in fig. 3, 4, in which the pressure regulating valve 4, the flow control valve 5, the flow meter 6, the on-off valve 7, and the associated lines of the dilution unit 3 are integrated through the dilution unit case 11.
The filter case 10 surrounds the main portion (filter element) of the gas filter 2, and is equipped with a three-way joint 12. The three-way joint 12 is connected to lines L1, L2, respectively, for merging the original exhaust gas from the engine and the dilution gas from the dilution unit 3 into the gas filter 2.
Heating wires are arranged in the filter housing 10 for heating the filter elements of the gas filter 2. At least one wall of the filter case 10 is provided with a ventilation window.
The dilution assembly housing 11 and the filter housing 10 are supported by a common support 13. The stand 13 includes a vertically extending stand 14, a base frame 15 for supporting on the ground, and a reinforcing frame 16 for fixing the stand 14 to the base frame 15.
The dilution unit housing 11 and the filter housing 10 are mounted on a stand 14, the dilution unit housing 11 being located above the filter housing 10. The dilution assembly housing 11 and the filter housing 10 have adjustable vertical positions relative to the stand 14. For example, in the example shown in fig. 3, the filter case 10 is fixed to the stand 14 by a back fixing plate 17 and a lock bolt 18. By loosening the locking bolt 18, the vertical position of the filter case 10 can be adjusted.
The exhaust gas analyzer 1 may be supported by the stand 14, for example, combined with the back surface of the filter case 10. Alternatively, the exhaust gas analyzer 1 may be disposed beside the holder 13.
Other configurations of integrating the vent testing apparatus may also be used.
In summary, in the dilution unit 3 of the present application, by using the pressure regulating valve 4 having a heating function, the dilution gas can be heated to prevent the temperature of the exhaust gas after dilution from decreasing, so that HC deposition can be avoided, automatic calibration of the test equipment is ensured not to easily exceed a conventional range, and higher test accuracy can be obtained. The heating function of the gas filter 2 can further assist in preventing the temperature of the diluted sampled exhaust gas from decreasing.
In a possible embodiment, an electric hot plate is provided on the base of the pressure regulating valve 4. In this simple manner, heating in the dilution gas is achieved. The pressure regulating valve 4 after being reformed has simple structure, low reforming cost and small appearance change, and can not occupy overlarge installation space.
Further, by controlling the flow rate of the dilution gas by the flow rate control valve 5, it is possible to cause the diluted sampled exhaust gas to be supplied to the exhaust gas analyzer 1 at an accurate and constant dilution ratio and flow rate, thereby ensuring that a high-precision analysis result is obtained.
Although the present application has been described herein with reference to specific exemplary embodiments, the scope of the present application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the application.
Claims (11)
1. An exhaust dilution device, comprising:
a raw exhaust gas introduction line (L1) for introducing sampled exhaust gas from the engine;
a dilution gas introduction line (L2) that meets the original exhaust gas introduction line to add dilution gas to the sampled exhaust gas, the dilution gas introduction line having a pressure regulating valve (4), a flow control valve (5), a flow meter (6), and an on-off valve (7) arranged in series therein, wherein an output pressure of the pressure regulating valve (4) is adjustable;
characterized in that the pressure regulating valve (4) is integrated with a heating element for heating the diluent gas flowing through the pressure regulating valve (4).
2. The exhaust gas dilution apparatus defined in claim 1 wherein said heating element is an electric hot plate attached to the base of said pressure regulating valve.
3. The exhaust dilution apparatus of claim 1, wherein a heating power of the heating element is adjustable, the heating power being adjusted based on one or more of a temperature of the diluent gas prior to flowing into the pressure regulating valve, a temperature of the diluent gas after flowing through the pressure regulating valve, a flow rate of the diluent gas, a sampled exhaust temperature, and a sampled exhaust flow rate.
4. The exhaust dilution apparatus of any one of claims 1-3, wherein a flow rate of the flow control valve is adjustable, the flow rate of the flow control valve being adjusted based on a sampled exhaust flow rate and a dilution ratio of a dilution gas to the sampled exhaust.
5. The exhaust gas dilution device defined in any one of claims 1-3, wherein the flow control valve is a needle valve.
6. The exhaust gas dilution device according to any one of claims 1 to 3, further comprising: a gas filter (2) for filtering diluted engine exhaust gas, the gas filter being equipped with a heating element.
7. The exhaust gas dilution device according to claim 6, further comprising a filter case (10) that surrounds the body portion of the gas filter, and the heating element of the gas filter is a heating wire provided in the filter case for heating the body portion of the gas filter.
8. An exhaust gas dilution apparatus as defined in claim 7, wherein said pressure regulating valve, flow control valve, flow meter, on-off valve are integrated together by a common dilution unit housing (11) to form an integral dilution unit (3).
9. Exhaust gas dilution apparatus according to claim 8, wherein the dilution assembly housing and the filter housing are supported by a common support (13) in a vertically adjustable manner.
10. An exhaust testing apparatus, comprising:
the exhaust gas dilution device according to any one of claims 1 to 9; and
and the exhaust gas analyzer (1) is connected with the exhaust gas diluting device and used for receiving the diluted engine exhaust gas supplied by the exhaust gas diluting device and analyzing the content of the target component in the engine exhaust gas.
11. The exhaust gas testing apparatus of claim 10, further comprising a controller coupled to the exhaust gas analyzer and the exhaust gas dilution device and configured to determine a dilution ratio of dilution gas to sampled exhaust gas and to close-loop adjust a flow of the flow control valve in the exhaust gas dilution device based on the determined dilution ratio and sampled exhaust gas flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022047178.5U CN213364229U (en) | 2020-09-17 | 2020-09-17 | Exhaust gas dilution device and exhaust gas test equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022047178.5U CN213364229U (en) | 2020-09-17 | 2020-09-17 | Exhaust gas dilution device and exhaust gas test equipment |
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| Publication Number | Publication Date |
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| CN213364229U true CN213364229U (en) | 2021-06-04 |
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| CN202022047178.5U Active CN213364229U (en) | 2020-09-17 | 2020-09-17 | Exhaust gas dilution device and exhaust gas test equipment |
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