# US 2021/0278325 A1 · Exhaust gas dilution device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278325 A1 - Document ID: US20210278325A1 - Status: Published application - Kind: A1 - Application number: 17/258,979 - Filed: 2019-06-25 - Published: 2021-09-09 - Earliest claimed: 2018-07-10 - Assignees: Korea Institute of Machinery & Materials - Applicants: Korea Institute of Machinery & Materials - Inventors: Bangwoo HAN; Chang Gyu WOO; Hak Joon KIM; Yong-Jin KIM - Web page: https://patentgrep.com/patent/US20210278325A1 ## CPC - G01N 1/2258: {in a stack or chimney} - G01N 1/38: Diluting, dispersing or mixing samples - G01N 1/2247: {Sampling from a flowing stream of gas} - G01N 2001/2244: {Exhaled gas, e.g. alcohol detecting} - G01N 2001/2261: {preventing condensation (heating lines)} - G01N 2001/2264: {with dilution} - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract An exhaust gas dilution device according to an exemplary embodiment of the present invention includes a head part, ejector unit, a nozzle part, and a dilution part. The head part has a space part into which an exhaust gas flows and a through-hole formed through the center axis direction to be connected to the space part. The ejector unit is coupled to the head part and has a first discharge hole formed passing through the center axis direction to be connected to the through-hole and connected to a first inlet to which primary dilution air is supplied. The nozzle part is inserted into a first discharge hole through the through-hole and has a second discharge hole that penetrates in the center axis direction so that the exhaust gas flowed into the space part is sucked and ejected into the first discharge hole as the primary dilution air moves through the first discharge hole. The dilution part has a first flow path part into which a primary dilution gas, which is generated and discharged after the exhaust gas and the primary dilution air are mixed in the first discharge hole, flows, and a second flow path part connected to the first flow path part and guiding secondary dilution air to be mixed with the primary dilution gas, and generates a secondary dilution gas as the primary dilution gas and the secondary dilution air are mixed. ## Claims ### Claim 1 An exhaust gas dilution device comprising: a head part having a space part into which an exhaust gas flows and a through-hole formed passing through a center axis direction to be connected to the space part; an ejector unit coupled to the head part and having a first discharge hole formed passing through the center axis direction to be connected to the through-hole and connected to a first inlet to which primary dilution air is supplied; a nozzle part inserted into the first discharge hole through the through-hole and having a second discharge hole formed through the center axis direction so that the exhaust gas flowed into the space part is sucked in and ejected into the first discharge hole as the primary dilution air is moved through the first discharge hole; and a dilution part having a first flow path part into which a primary dilution gas, which is generated and discharged after the exhaust gas and the primary dilution air are mixed in the first discharge hole, flows and a second flow path part connected to the first flow path part and guiding secondary dilution air to be mixed with the primary dilution gas, and generating a secondary dilution gas as the primary dilution gas and the secondary dilution air are mixed. ### Claim 2 (depends on 1) The exhaust gas dilution device of claim 1, wherein the first discharge hole has a suction part formed on the rear end of the ejector unit and connected to the first inlet and an acceleration part formed on the front end of the suction part and a diffusion part formed on the front end of the acceleration part, and the nozzle part has a flange part coupled to the inner surface of the space part, a connection part connected to the flange part and provided on the through-hole and the inside of the suction part, and a nozzle tip part formed on the front end of the connection part and inserted into the acceleration part and having an exterior diameter corresponding to the interior diameter of the acceleration part. ### Claim 3 (depends on 2) The exhaust gas dilution device of claim 2, wherein the nozzle tip part has a first discharge flow path on an external circumferential surface so that the primary dilution air flowed to the suction part is discharged to the diffusion part. ### Claim 4 (depends on 3) The exhaust gas dilution device of claim 3, wherein the first discharge flow path is formed in a spiral. ### Claim 5 (depends on 3) The exhaust gas dilution device of claim 3, wherein the first discharge flow path is formed in the axis direction of the nozzle tip part and disposed in plural with a predetermined interval along the circumferential direction of the nozzle tip part. ### Claim 6 (depends on 2) The exhaust gas dilution device of claim 2, wherein the acceleration part has a second discharge flow path on the interior circumference so that the primary dilution air flowed to the suction part is discharged to the diffusion part. ### Claim 7 (depends on 6) The exhaust gas dilution device of claim 6, wherein the second discharge flow path is formed in a spiral. ### Claim 8 (depends on 6) The exhaust gas dilution device of claim 6, wherein the second discharge flow path is formed in the axis direction of the acceleration part and disposed in plural with a predetermined interval along the circumferential direction of the acceleration part. ### Claim 9 (depends on 1) The exhaust gas dilution device of claim 1, wherein the primary dilution air is supplied with a temperature of 150° C. to 250° C. so that the primary dilution gas is generated by a high temperature dilution method, and the secondary dilution air is supplied with a temperature of 10° C. to 30° C. so that the secondary dilution gas is generated by a room temperature dilution method. ### Claim 10 (depends on 1) The exhaust gas dilution device of claim 1, wherein in the first flow path part, a plurality of through holes are formed to pass through the secondary dilution air.