KR101246834B1 - Apparatus for Sampling and Measuring Particulate Matter from Exhaust Gases - Google Patents

Abstract

Disclosed is a particulate matter measuring apparatus of exhaust gas. The dilution tunnel particulate matter measuring apparatus of the present invention includes a filter cartridge for accommodating filter paper for collecting particulate matter contained in the dilution gas in which the exhaust gas and the outside air are diluted, and the filter cartridge is mounted on a system in which the dilution gas flows. Or a removable structure. Furthermore, the lower end of the filter cartridge can be easily attached and detached by connecting a connecting tube, for example, a corrugated pipe, which is bent or variable in length so that the filter cartridge is detachable or mountable. The measuring device of the present invention may be provided with a plurality of filter units, and only one of the plurality of filter units may be selectively operated by an on / off valve.

Description

Apparatus for Sampling and Measuring Particulate Matter from Exhaust Gases}

The present invention relates to a dilution tunnel particulate matter measuring apparatus that can easily replace the filter cartridge used to measure the amount of particulate matter contained in the exhaust gas in a dilution tunnel manner.

Exhaust gases such as automobiles contain carbon monoxide (CO), carbon dioxide (CO ₂ ), hydrocarbons (HC), nitrogen oxides (NO _X ), and the like, which are harmful to the human body, which is a major factor in environmental pollution. In addition, the exhaust gas may contain particulate matter (PM) such as carbon (C), hydrocarbon (HC), sulfide, etc. by itself or in reaction with the atmosphere, and the particulate matter directly causes respiratory diseases of the human body. It is a substance that requires more control and regulation.

Dilution tunnel method is widely used as a method for measuring particulate matter contained in exhaust gas of an automobile engine. In the dilution tunnel method, dilution discharge similar to the actual emission gas is first made by mixing external air with the sample exhaust gas collected from the engine exhaust pipe and passing through the dilution tunnel to create an environment similar to the actual vehicle operation state in which the emission gas reacts with the atmosphere. The weight of the particulate matter is measured by constituting the gas, filtering the diluted exhaust gas using a filter, and then weighing the particulate matter filtered by the filter.

Dilution tunnel type particulate matter measurement device (hereinafter, simply referred to as 'measurement device') includes a full flow dilution tunnel system in which the entire exhaust gas flows into the dilution tunnel, and a part of the exhaust gas flows in. There is a Partial Flow Dilution Tunnel System.

The conventional measuring device includes a filter holder in which a filter to be used for measuring particulate matter of the exhaust gas is installed. Since the filter must be replaced at each test, the replacement of the filter is repeated during the repeated tests. Therefore, the repeated replacement of the filter needs to be made more easily, and for that purpose, the filter holder needs to be easily removed.

In the conventional dilution tunnel type particulate matter measuring device, a rubber hose tube is used to separate the filter holder, and the rubber hose tube is severely worn, and due to the abnormal high temperature of the exhaust gas, heat fusion occurs at the rubber hose tube connection to separate itself. There was a problem.

An object of the present invention is to provide a dilution tunnel particulate matter measuring apparatus that can easily replace the filter cartridge used to measure the amount of particulate matter contained in the exhaust gas in a dilution tunnel method.

Dilution tunnel-type particulate matter measuring apparatus of the present invention for achieving the above object is a dilution tunnel in which the exhaust gas and the outside air to be inspected is introduced and diluted; A distribution pipe connected to an outlet of the dilution tunnel; A flow rate measuring unit measuring a flow rate of the dilution gas discharged from the dilution tunnel; A filter cartridge mounted or detachably connected between the distribution pipe and the flow rate measurement part, the filter cartridge including filter paper for collecting particulate matter contained in the dilution gas discharged from the dilution tunnel; And a connection pipe provided between the filter cartridge and the flow rate measuring means and bent or variable in length so that the filter cartridge is detachable or mountable. The filter cartridge and the connecting pipe form one filter part.

Here, the filter cartridge, the mesh filter for supporting the filter paper (Mesh); An upper cover connected to the distribution pipe; A lower cover connected to the connector and accommodating the mesh filter in an inner space formed together with the upper cover; And a clamp for tightening and sealing a connecting portion of the upper cover and the lower cover.

According to an embodiment, the connecting pipe may be provided as a freely movable corrugated pipe to facilitate mounting and detachment of the filter cartridge.

According to another embodiment, the measuring device of the present invention may include a plurality of filter units. To this end, the measuring device includes a plurality of first on-off valves respectively provided between the dilution tunnel and the plurality of filter units, and a plurality of second on-off valves respectively provided between the flow rate measuring unit and the plurality of filter units. Accordingly, the measurement of the particulate matter can be made alternately by the plurality of filter parts.

The measuring device of the present invention may further include an intake valve provided at the front end of the dilution tunnel to control the inflow of the outside air. In this case, the flow rate measuring part may control the intake valve based on the measured flow rate of the dilution gas to feedback control the amount of external air flowing into the dilution tunnel, thereby maintaining a constant dilution ratio of the dilution gas.

Dilution tunnel type particulate matter measuring apparatus according to the present invention can measure the amount of particulate matter included when the exhaust gas is discharged into the atmosphere in the same environment as the actual using a dilution tunnel.

In the present invention, the filter cartridge for accommodating the filter paper used for the collection of particulate matter can be easily attached to or detached from the system by a simple screw coupling structure and a flexible corrugated pipe type connection structure. There is no fear of damage even in mounting and dismounting. As the connecting pipe uses a fluorine-based polymer resin as a raw material, thermal fusion due to high temperature dilution gas does not occur.

In addition, the measuring device of the present invention can be provided with a plurality of filter units that can be used alternately, it is possible to continue the sample measurement irrespective of the replacement of the filter unit is completed collecting the particulate matter.

1 is a schematic view showing a dilution tunnel type particulate matter measuring apparatus of the present invention, and
2 is an exploded perspective view of a filter cartridge according to an embodiment of the present invention.
<Explanation of symbols for the main parts of the drawings>
110: dilution tunnel 110a: outlet
113: air inlet 115: intake valve
117: gas inlet 119: distribution pipe
130a, 130b, 130c: filter part
131a, 131b, 131c: filter cartridge
133a, 133b, 133c: connector
151a, 151b, 151c: first opening / closing valve
153a, 153b, 153c: second open / close valve
170: flow measurement unit 201: filter paper
203: mesh filter 205: top cover
207: lower cover 209: clamp

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

Dilution tunnel particulate matter measuring apparatus of the present invention (hereinafter, simply referred to as 'measurement device') makes a dilution gas by diluting the outside air to the exhaust gas to be a sample from the outside, and then the particulate matter contained in the dilution gas (PM: Particulate Matter) can be measured.

Measuring apparatus 100 of the present invention comprises a configuration for collecting particulate matter in a dilution tunnel method, and a separate constant temperature and humidity chamber (not shown) for measuring the weight of the collected particulate matter. However, in the present invention, since the configuration of collecting particulate matter is characterized, the description thereof will be mainly performed, and the chamber will be briefly described when necessary.

1 and 2, the measuring apparatus 100 of the present invention collects particulate matter from the dilution tunnel 110 through which the exhaust gas and the outside air are diluted and the dilution gas passing through the dilution tunnel 110. The filter unit 130a, 130b, 130c, and the flow rate measuring unit 170 for measuring the flow rate of the diluent gas passing through the filter unit (130a, 130b, 130c).

The front end of the dilution tunnel 110 is connected to the air inlet 113 and the gas inlet 117, the outside air is introduced into the dilution tunnel 110 through the air inlet 113 and the exhaust gas through the gas inlet 117 Is introduced into the dilution tunnel 110. Between the air inlet 113 and the dilution tunnel 110, the intake valve 115 is controlled by the flow measurement unit 170 to control the amount of external air introduced, that is, the amount of the exhaust gas and the external air diluted. Prepared.

The flow rate measuring unit 170 controls the intake valve 115 to maintain a constant dilution ratio of the dilution gas on the conduit. To this end, the flow rate measuring unit 170 measures the flow rate (L1, L1 = L2 + L3) of the dilution gas passing through the filter unit, and opens and closes the intake valve 115 based on the measured flow rate of the dilution gas. The flow rate measuring unit 170 controls the amount (L2) of the external air introduced through the intake valve 115, so that the dilution ratio of the dilution gas diluted in the dilution tunnel 110 irrespective of the amount (L3) of the exhaust gas. It is possible to keep (L3 / L1) constant at the set value.

A plurality of filter units may be provided. In the embodiment of FIG. 1, three filter units 130a, 130b, and 130c may be provided. The outlet 110a of the dilution tunnel 110 is connected to each filter unit 130a, 130b, 130c through the distribution pipe 119.

The plurality of filter units 130a, 130b, and 130c are alternately used, so that only one selected from the plurality of filter units 130a, 130b, and 130c is connected to the dilution tunnel 110 and the flow rate measuring unit 170 to form particulate matter. Is provided in the instrumentation. To this end, first opening and closing valves 151a, 151b, and 151c and second opening and closing valves 153a, 153b, and 153c are provided at the front and rear ends of the filter units 130a, 130b, and 130c, respectively. The first on-off valves 151a, 151b, and 151c and the second on-off valves 153a, 153b, and 153c are controlled to open only the filter unit to be provided for the test among the plurality of filter units 130a, 130b, and 130c. For example, the first filter 130a is opened while the first-first open / close valve 151a and the second-first open / close valve 153a are opened. The first on-off valves 151a, 151b, and 151c and the second on-off valves 153a, 153b, and 153c may be controlled by a manager operating a separately provided control switch (not shown), or automatically controlled by another controller. May be

The filter parts 130a, 130b, and 130c are provided on the system of the dilution gas, and are means for collecting particulate matter from the dilution gas using filter paper. When the particulate matter is collected, the filter cartridge of the filter unit is separated from the system and transferred to a separate constant temperature and humidity chamber (not shown). Because the amount of particulate matter collected is very small, it may not be desirable to weigh in the normal atmosphere or the like. The filter paper 201 contained in the filter unit in the chamber (not shown) is separated to measure the weight of the particulate matter.

Each filter unit 130a, 130b, 130c includes filter cartridges 131a, 131b, 131c for accommodating filter paper, and below each filter cartridge 131a, 131b, 131c is a filter cartridge 131a, 131b, 131c. Connecting pipes (133a, 133b, 133c) for easy mounting and detachment of each is provided.

The connecting tubes 133a, 133b, and 133c are easily bent or have a variable length, so that the filter cartridges 131a, 131b, and 131c, which have collected the particulate matter, are easily separated from the system. The connecting pipes 133a, 133b, and 133c are preferably made of a fluorine-based polymer resin so that thermal fusion or the like due to high temperature dilution gas does not occur. The example of FIG. 1 and FIG. 2 is the example which applied the corrugated pipe of the form which can flow to connection pipe | tube 133a, 133b, 133c, but is not limited to this.

Referring to FIG. 2, the filter cartridge 131a may include a mesh filter 203 supporting a filter paper 201 having a predetermined size, and an upper cover configured to seal the mesh filter 203 by forming an inner space. 205 and bottom cover 207. Furthermore, the filter cartridge 131a includes a clamp 209 which covers the connecting portion of the upper cover 205 and the lower cover 207 to seal the inner space.

One side of the upper cover 205 is provided with an inlet 205a coupled with the distribution pipe 119, and one side of the lower cover 207 is provided with an exhaust port 207a coupled with the first connecting pipe 133a, thereby providing a filter. The cartridge 131a is mounted between the distribution pipe 119 and the first connection pipe 133a. In order to quickly and easily mount and detach the filter cartridge 131a, a quick coupler or the like may be installed in the inlet 205a and the exhaust port 207a. Accordingly, the dilution gas discharged from the dilution tunnel 110 is divided into the distribution pipe 119 → the upper cover 205 → the filter paper 201 → the mesh filter 203 → the lower cover 207 → the first connection pipe 133a. It passes through the flow measurement unit 170.

Hereinafter, the operation of the measuring apparatus 100 of the present invention will be described.

When the discharge gas to be a sample is introduced into the dilution tunnel 110 through the gas inlet 117, the flow rate measuring unit 170 opens the intake valve 115 to allow the outside air to flow into the dilution tunnel 110, The intake valve 115 is continuously controlled so that the dilution ratio of the dilution gas is kept constant. In this case, the plurality of first on-off valves 151a, 151b, and 151c and the second on-off valves 153a, 153b, and 153c control to selectively open only one filter unit among the plurality of filter units 130a, 130b, and 130c. do. For convenience of description, it is assumed that the first-first open / close valve 151a and the second-first open / close valve 153a are opened to operate the first filter unit 130a.

The dilution gas diluted in the dilution tunnel 110 is divided into the distribution pipe 119 → the upper cover 205 of the first filter part 130a → the filter paper 201 → the mesh filter 203 → the first filter part 130a. The lower cover 207 is introduced into the flow rate measuring unit 170 through the first connecting pipe 133a. In this process, the filter paper 201 collects particulate matter contained in the diluent gas.

The flow rate measuring unit 170 measures the flow rate of the dilution gas passing through the first filter unit 130a, and maintains the dilution ratio constant by feedback control of the intake valve 115 according to the measurement result.

When the particulate matter is collected in the first filter unit 130a, the first-first open / close valve 151a and the second-first open / close valve 153a are closed to close the first filter unit 130a. In conjunction with this, the second filter unit 130b may be opened, or all of the filter units 130a, 130b, and 130c may be closed for a while for the next preparation.

The manager separates the filter cartridge 131a by separating the quick coupler coupled to the distribution pipe 119 and the first connection pipe 133a from the first filter part 130a and then into a separate constant temperature and humidity chamber (not shown). Move.

Within the chamber, the manager opens the clamp 209 of the filter cartridge 131a to separate the upper cover 205 and the lower cover 207 and to remove the filter paper 201 placed on the mesh filter 203. The manager measures the weight of the particulate matter by providing the separated filter paper 201 to a separate measuring means. Naturally, during this operation, the second filter unit 130b or the third filter unit 130c may operate to alternately perform the test without interruption.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

Claims (5)

A dilution tunnel into which the exhaust gas and the outside air to be inspected are introduced and diluted;
A distribution pipe connected to an outlet of the dilution tunnel;
A flow rate measuring unit measuring a flow rate of the dilution gas discharged from the dilution tunnel;
A filter cartridge mounted or detachably connected between the distribution pipe and the flow rate measurement part, the filter cartridge including filter paper for collecting particulate matter contained in the dilution gas discharged from the dilution tunnel; And
It is provided between the filter cartridge and the flow rate measuring unit, and includes a connecting pipe bent or variable in length so that the filter cartridge is removable or mounted,
The filter cartridge includes:
A mesh filter supporting the filter paper;
An upper cover coupled to the distribution pipe;
A lower cover coupled to the connector and forming together with the upper cover an inner space for accommodating the mesh filter; And
And a clamp for tightening and closing a connection portion between the upper cover and the lower cover.
delete The method of claim 1,
The connecting pipe is a particulate matter measurement device of the exhaust gas, characterized in that the freely movable corrugated pipe.
The method of claim 1,
A plurality of filter parts including the filter cartridge and the connection pipe,
And a plurality of first on-off valves respectively provided between the dilution tunnel and the plurality of filter units, and a plurality of second on / off valves respectively provided between the flow rate measuring unit and the plurality of filter units. Particle matter measuring apparatus for the exhaust gas, characterized in that alternately made by two filter units.
The method of claim 1,
Further provided to the front end of the dilution tunnel, and further comprising an intake valve for controlling the inflow of the outside air,
The flow rate measuring unit controls the intake valve based on the measured flow rate of the dilution gas to feedback control the amount of external air flowing into the dilution tunnel, thereby maintaining a dilution ratio of the dilution gas at a constant discharge rate. Gas particulate matter measuring device.

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